CN114162935A

CN114162935A - Water purification system, control method thereof and water purification equipment

Info

Publication number: CN114162935A
Application number: CN202110559617.7A
Authority: CN
Inventors: 刘亚涛; 魏中科; 吴启军; 全永兵; 王雪青; 叶耀泽; 李豪
Original assignee: Foshan Midea Qinghu Water Purification Equipment Co ltd; Midea Group Co Ltd
Current assignee: Foshan Midea Qinghu Water Purification Equipment Co ltd; Midea Group Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2022-03-11
Anticipated expiration: 2041-05-21
Also published as: CN114162935B

Abstract

The invention discloses a water purification system, a control method thereof and water purification equipment, wherein the water purification system comprises: a water tank; the first detector is used for detecting the total dissolved solid value of the inlet water of the water purification system to obtain inlet water TDS; the water pump is connected to a water path of the water purification system; an electrodialysis membrane stack and a water outlet; the water path switching device is respectively connected with the water pump, the water tank, the electrodialysis membrane stack and the water outlet and is used for switching the water path of the water purification system; and the controller is used for determining the pole-reversing time according to the intake TDS, determining the water making mode according to the pole-reversing time, and controlling the voltage applied to the water pump, the water path switching device and the electrodialysis membrane stack according to the determined water making mode when the water purifying system makes water. This water purification system can in time switch the water route and make the water mode according to water purification system's the quality of water condition of intaking, prolongs the inside scale deposit time of electrodialysis membrane stack, reduces the washing number of times to the electrodialysis membrane stack, prolongs the life of electrodialysis membrane stack.

Description

Water purification system, control method thereof and water purification equipment

Technical Field

The invention relates to the technical field of water purification, in particular to a water purification system, a control method thereof and water purification equipment.

Background

The application of electrodialysis to a household water purifier has the following advantages: the quality of the fresh water is adjustable, the recovery rate is high, and the water outlet proportion of the purified water can reach 90 percent. Based on the advantages, the electrodialysis has great application potential in the field of household water purifiers.

For the electrodialysis membrane stack, in the frequent water purification process, one end of the membrane stack can adsorb a large amount of ions, wherein calcium and magnesium ions are abundant, and in the long-term use process, scales such as calcium carbonate and magnesium carbonate can be formed to cause the membrane stack to be blocked and bear pressure, so that the water purification capacity is reduced, and even the water purification capacity is lost. Therefore, it is an urgent problem to be solved by those skilled in the art to provide a water purification system capable of effectively prolonging the service life of an electrodialysis membrane stack.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a control method for a water purification system, which can switch between a water path and a water production mode of the water purification system according to the quality of inlet water of the water purification system, and has an advantage of effectively prolonging the service life of an electrodialysis membrane stack.

The second objective of the present invention is to provide a control method for a water purification system.

A third object of the invention is to propose a computer-readable storage medium.

A fourth object of the invention is to propose an electronic device.

A fifth object of the present invention is to provide a water purifying apparatus.

In order to achieve the above object, a first aspect of the present invention provides a water purification system, which includes: a water tank; the first detector is used for detecting the total dissolved solid value of the inlet water of the water purification system to obtain inlet water TDS; the water pump is connected to a water path of the water purification system; an electrodialysis membrane stack and a water outlet; the water path switching device is respectively connected with the water pump, the water tank, the electrodialysis membrane stack and the water outlet and is used for switching the water path of the water purification system; the controller is respectively connected with the first detector, the water path switching device and the water pump and is used for determining the pole-reversing time according to the TDS of the inlet water, determining a water production mode according to the pole-reversing time, and controlling the voltage applied to the water pump, the water path switching device and the electrodialysis membrane stack according to the determined water production mode when the water purification system produces water.

According to the water purification system provided by the embodiment of the invention, the water path switching device is arranged among the water pump, the water tank, the electrodialysis membrane stack and the water outlet, and the water path and the water production mode of the water purification system are switched in time through the controller according to the water inlet condition of the water purification system, so that the scaling time in the electrodialysis membrane stack is prolonged, the cleaning times of the electrodialysis membrane stack are reduced, and the service life of the electrodialysis membrane stack is prolonged.

In addition, the water purification system provided by the above embodiment of the invention may further have the following additional technical features:

according to one embodiment of the present invention, the water tank includes a raw water tank and a waste water tank, the electrodialysis membrane stack includes a first water chamber and a second water chamber, and the water path switching device includes: one end of the first flow valve is connected with the water pump, the other end of the first flow valve is connected with one end of the second flow valve to form a first node, the other end of the second flow valve is connected with the water inlet end of the first water chamber, one end of the third flow valve is connected with the first node, and the other end of the third flow valve is connected with the water inlet end of the second water chamber; the waste water treatment system comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve, wherein one end of the first electromagnetic valve is connected with the water outlet, one end of the second electromagnetic valve is connected with the waste water tank, one end of the third electromagnetic valve is connected with the other end of the first electromagnetic valve to form a second node, one end of the fourth electromagnetic valve is connected with the raw water tank, the other end of the second electromagnetic valve is connected with the other end of the fourth electromagnetic valve to form a third node, the other end of the third electromagnetic valve is connected with the other end of the fourth electromagnetic valve to form a fourth node, and the fourth node is connected with the third node; a first end of the four-way valve is connected with a water outlet end of a first water chamber of the electrodialysis membrane stack, a second end of the four-way valve is connected with the second node, a third end of the four-way valve is connected with the third node, and a fourth end of the four-way valve is connected with a water outlet end of a second water chamber of the electrodialysis membrane stack; wherein the controller is connected to the first flow valve, the second flow valve, the third flow valve, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, and the four-way valve, respectively.

According to one embodiment of the invention, the system comprises: the front filter element is arranged on the water inlet side of the electrodialysis membrane stack; the post-positioned filter element is arranged on the water outlet side of the electrodialysis membrane stack.

According to one embodiment of the invention, the system comprises: the second detector is used for detecting the total dissolved solid value of the effluent of the water purification system to obtain the effluent TDS; wherein the controller is further connected with the second detector for adjusting the voltage applied to the electrodialysis module in dependence on the outlet water TDS.

According to one embodiment of the invention, the system further comprises: the power supply module is connected with the electrodialysis membrane stack and used for supplying power to the electrodialysis membrane stack; wherein the controller is also connected with the power supply module and is used for adjusting the voltage polarity applied to the electrodialysis membrane stack by the power supply module according to the water production mode.

In order to achieve the above object, a second aspect of the present invention provides a method for controlling a water purification system, the water purification system including a water tank, a water pump, an electrodialysis membrane stack, a water path switching device and a water outlet, the water pump being connected to a water path of the water purification system, the water path switching device being respectively connected to the water pump, the water tank, the electrodialysis membrane stack and the water outlet, the method including the steps of: acquiring a feed water TDS, wherein the feed water TDS is a total dissolved solids value of the feed water of the water purification system; determining the pole-reversing time according to the TDS of the inlet water; determining a water making mode according to the pole inverting time; and when the water purification system produces water, controlling the applied voltage of the water pump, the waterway switching device and the electrodialysis membrane stack according to the determined water production mode.

According to the control method of the water purification system, the water path and the water production mode of the water purification system are switched in time according to the water inlet condition of the water purification system, so that the scaling time in the electrodialysis membrane stack is prolonged, the cleaning times of the electrodialysis membrane stack are reduced, and the service life of the electrodialysis membrane stack is prolonged.

In addition, the control method of the water purification system according to the above embodiment of the present invention may further have the following additional technical features:

according to an embodiment of the invention, said determining the time to pole depending on said incoming water TDS comprises: detecting that the TDS of the inlet water is smaller than a first preset value, and determining that the pole-reversing time is first time; detecting that the incoming water TDS is greater than or equal to the first preset value and smaller than a second preset value, and determining that the pole-reversing time is a second time, wherein the second time is smaller than the first time; and determining that the incoming water TDS is greater than or equal to the second preset value, and determining that the pole-reversing time is a third time, wherein the third time is less than the second time.

According to an embodiment of the present invention, the determining the water making mode according to the pole inverting time comprises: when the water purification system produces water, recording the water consumption time of the water purification system in the current water production mode; comparing the water usage time with the pole reversal time; when the water using time is less than or equal to the pole reversing time, the water making mode is not switched; when the water using time is longer than the pole reversing time, switching a water making mode; wherein the water preparation mode comprises positive water preparation and reverse water preparation.

According to one embodiment of the invention, the water tank comprises a raw water tank and a waste water tank, the electrodialysis membrane stack comprises a first water chamber and a second water chamber, the water path switching device comprises a first flow valve, a second flow valve, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve, wherein one end of the first flow valve is connected with the water pump, the other end of the first flow valve is connected with one end of the second flow valve to form a first node, the other end of the second flow valve is connected with the water inlet end of the first water chamber of the electrodialysis membrane stack, one end of the third flow valve is connected with the first node, and the other end of the third flow valve is connected with the water inlet end of the second water chamber of the electrodialysis membrane stack; one end of the first electromagnetic valve is connected with the water outlet, one end of the second electromagnetic valve is connected with the wastewater tank, one end of the third electromagnetic valve is connected with the other end of the first electromagnetic valve to form a second node, one end of the fourth electromagnetic valve is connected with the raw water tank, the other end of the second electromagnetic valve is connected with the other end of the fourth electromagnetic valve to form a third node, the other end of the third electromagnetic valve is connected with the other end of the fourth electromagnetic valve to form a fourth node, and the fourth node is connected with the third node; the first end of the four-way valve is connected with the water outlet end of the first water chamber, the second end of the four-way valve is connected with the second node, the third end of the four-way valve is connected with the third node, and the fourth end of the four-way valve is connected with the water outlet end of the second water chamber; the controlling the water pump, the waterway switching device and the voltage applied to the electrodialysis membrane stack according to the determined water production mode comprises the following steps: controlling the third flow valve to be closed, controlling the first flow valve and the second flow valve to be opened, controlling the first electromagnetic valve and the second electromagnetic valve to be opened, controlling the first end and the second end of the four-way valve to be communicated, controlling the third end and the fourth end of the four-way valve to be communicated, controlling the third electromagnetic valve and the fourth electromagnetic valve to be closed, and controlling the water pump to be started; or, the second flow valve is controlled to be closed, the first flow valve and the third flow valve are controlled to be opened, the first electromagnetic valve and the second electromagnetic valve are controlled to be opened, the first end and the third end of the four-way valve are controlled to be communicated, the second end and the fourth end of the four-way valve are controlled to be communicated, the third electromagnetic valve and the fourth electromagnetic valve are controlled to be closed, and the water pump is controlled to be started.

According to an embodiment of the invention, the method further comprises: acquiring a water outlet TDS, and determining the current applied to the electrodialysis membrane stack and the pump water flow of the water pump according to the water outlet TDS, wherein the water outlet TDS is the total dissolved solid value of the water outlet of the water purification system; and controlling a power supply of the electrodialysis membrane stack according to the current and the water making mode, controlling the water pump according to the water pumping flow, and controlling the water path switching device to make water.

According to an embodiment of the present invention, the switching the water preparation mode when the water usage time is longer than the pole reversal time includes: and controlling the first flow valve, the second flow valve, the third flow valve, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the four-way valve to be fully closed, and resetting the water using time.

To achieve the above object, a third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, where the computer program is executed by a processor to implement the control method of the water purification system according to the second aspect of the present invention.

In order to achieve the above object, a fourth aspect of the present invention provides an electronic device, including a memory and a processor, where the memory stores a computer program, and the computer program, when executed by the processor, implements the method for controlling a water purification system according to the second aspect of the present invention.

In order to achieve the above object, a fifth embodiment of the present invention provides a water purifying apparatus, which includes the water purifying system as set forth in the first embodiment of the present invention, or an electronic apparatus as set forth in the fourth embodiment of the present invention.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural view of a water purification system according to an embodiment of the present invention;

fig. 2 is a schematic view of an installation structure of the waterway switching device according to an embodiment of the present invention;

FIG. 3 is a flow chart of a control method of a water purification system according to an embodiment of the present invention;

fig. 4 is a water production flow chart of the water purification system according to an embodiment of the invention;

fig. 5 is a schematic structural view of a water purifying apparatus according to an embodiment of the present invention;

FIG. 6 is an exploded view of a four-way valve according to one embodiment of the present invention;

FIG. 7 is a schematic diagram of a partial configuration of a four-way valve in accordance with one embodiment of the present invention;

FIG. 8 is a schematic diagram of the construction of the rotary disk of the four-way valve of one embodiment of the present invention;

FIG. 9 is a schematic diagram of the structure of the rotary disk of the four-way valve according to one embodiment of the present invention.

The reference numbers illustrate:

1. a water tank; 2. a first detector; 3. a water pump; 4. electrodialysis membrane stack; 5. a water outlet; 6. a waterway switching device; 7. a controller; 8. a second detector; 9. a front filter element; 10. a post-positioned filter element; 11. a power supply; 101. a raw water tank; 102. a wastewater tank; 401. a first water chamber; 402. a second water chamber; 601. a first flow valve; 602. a second flow valve; 603. a third electromagnetic valve; 604. a first solenoid valve; 605. a second solenoid valve; 606. a third electromagnetic valve; 607. a fourth solenoid valve; 608. a four-way valve; 100. a water purification system; 200. a water purification unit; 31. a first inlet; 32 a second inlet; 33. a first outlet; 34. a second outlet; 311. a base; 312. an upper end cover; 3121 mounting holes; 313. an accommodating chamber; 320. a runner pan; 321. liquid inlet and outlet; 322. liquid outlet and passing through the opening; 323. a liquid inlet connector; 324. a liquid outlet connector; 330. a turntable; 331. a first groove; 332. a second groove; 333. a transmission connection part; 350. a drive device.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The following will describe a water purification system, a control method thereof, and a water purification apparatus according to embodiments of the present invention in detail with reference to fig. 1 to 9 and specific embodiments of the specification.

Fig. 1 is a schematic structural diagram of a water purification system according to an embodiment of the present invention. As shown in fig. 1, the water purification system 100 includes: the device comprises a water tank 1, a first detector 2, a water pump 3, an electrodialysis membrane stack 4, a water outlet 5, a water path switching device 6 and a controller 7.

In particular, referring to fig. 1, the water tank 1 may include a raw water tank 101 and a waste water tank 102. The raw water tank 101 is used for storing raw water, wherein the raw water may be municipal tap water, but is not limited to the municipal tap water. The waste water tank 102 may be used to receive waste water discharged from the electrodialysis membrane stack 4 during water production or cleaning waste water generated during cleaning of the electrodialysis membrane stack 4. The raw water tank 101 and the waste water tank 102 may be two separately unconnected tanks, or two chambers formed by a partition in one tank. Preferably, the volume of the raw water tank 101 may be larger than the volume of the waste water tank 102 to ensure the water demand of the user.

A first detector 2 is provided for detecting the Total Dissolved Solids (TDS) of the feed water to the water purification system 100 to obtain the TDS of the feed water, which may be in milligrams per liter, indicating how many milligrams of Dissolved Solids are Dissolved in each liter of water. In general, TDS reflects the condition of water quality, with higher values of TDS, i.e., more dissolved solids per liter of water, indicating poorer water quality.

As a possible embodiment, a first detector 2 may be disposed on the side of the water outlet of the raw water tank 101 to detect the TDS of the raw water flowing out of the raw water tank 101, so as to obtain the TDS of the inlet water of the water purification system 100, i.e. the inlet TDS. According to the obtained value of the TDS of the inlet water, the mg of soluble solids dissolved in each liter of raw water and the water quality condition of the raw water can be known, namely the water quality condition of the inlet water of the water purification system 100 is detected. Wherein the first detector 2 may employ a TDS sensor.

The water pump 3 is connected to a water path of the water purification system 100 to provide water supply power for the water purification system 100. In an embodiment of the present invention, a water pump 3 may be disposed between the raw water tank 101 and the electrodialysis membrane stack 4 for feeding the raw water in the raw water tank 101 into the electrodialysis membrane stack 4. Wherein, the maximum pump water flow of the water pump 3 can be 1000 mL/min.

The electrodialysis membrane stack 4 is used for receiving the inlet water of the water purification system 100 and purifying the inlet water of the water purification system 100 to obtain purified water. The electrodialysis membrane stack 4 can purify the water body by an electrodialysis technology, can prepare purified water with adjustable TDS (total dissolved solids), and has the advantages of adjustable quality of fresh water, high recovery rate, 90% of purified water outlet proportion and the like. In the embodiment of the present invention, the electrodialysis is preferably a frequent reverse electrodialysis, and the working principle of the frequent reverse electrodialysis is as follows: the electrodialysis membrane stack is an electrochemical water purification module consisting of an ion exchange membrane, a flow channel and electrodes, ions are driven by an electric field to move directionally, and are influenced by selective permeation of the ion exchange membrane to generate dense-dilute water separation. Under the action of an electric field, the orderly arrangement of the anion-cation exchange membranes divides the frequent reverse-electrode electrodialysis membrane stack into a purified water chamber and a concentrated water chamber in order. The water purification capacity of the EDR membrane stack is influenced by external voltage, and the target water quality can be controlled by adjusting the external voltage. In the operation process, the polarities of the positive electrode and the negative electrode of the electrodialysis membrane stack are mutually inverted at regular intervals, so that dirt formed on the surfaces of the ion exchange membrane and the electrodes can be automatically cleaned, and the long-term stability of the efficiency of the ion exchange membrane and the water quality and the water quantity of fresh water are ensured. When the electrodes are reversed, the polarities of the electrodes are exchanged, and the thick and thin chambers and the thick and thin water paths are also exchanged. It should be understood that "inverting" means that the polarities of the positive and negative electrodes are inverted once, for example, the electrodialysis membrane stack is provided with a first electrode and a second electrode, where the first electrode is a positive electrode and the second electrode is a negative electrode, and after inverting, the first electrode is a negative electrode and the second electrode is a positive electrode.

Therein, the electrodialysis membrane stack 4 may comprise a first water chamber 401 and a second water chamber 402, each of which may have an inlet and an outlet.

The water path switching device 6 is respectively connected with the water pump 3, the water tank 1, the electrodialysis membrane stack 4 and the water outlet 5 and is used for switching the water path of the water purification system 100. Set up water route auto-change over device 6, when water purification system 100 changes the system water mode, the state of all valves of adjustment water route auto-change over device 6 switches the water route of water purification system 100 to ensure that the water purification of water purification system 100 can not be in disorder with the water route that the waste water flows, do not receive the influence that the system water mode changed with the system water effect that realizes water purification system 100.

The controller 7 is respectively connected with the first detector 2, the water path switching device 6 and the water pump 3 and is used for determining the pole-reversing time according to the intake TDS, determining the water making mode according to the pole-reversing time, and controlling the voltage application of the water pump 3, the water path switching device 6 and the electrodialysis membrane stack 4 according to the determined water making mode when the water purifying system makes water.

In the embodiment of the present invention, the controller 7 may be a single chip or a PC, and is electrically connected to the first detector 2, the water path switching device 6, and the water pump 3, and configured to receive the incoming water TDS detected by the first detector 2, determine the pole-reversing time according to the incoming water TDS by looking up a table, determine the water production mode of the water purification system 100 according to the pole-reversing time, and control the water path switching device 6 to switch the water path of the water purification system 100 as needed according to the determined water production mode when the water purification system 100 produces water, and start and control the water supply of the water pump 3 and control the voltage applied to the electrodialysis membrane stack.

Therefore, the water purification system provided by the embodiment of the invention can timely switch the water path and the water production mode according to the water quality condition of the inlet water of the water purification system, so that the scaling time in the electrodialysis membrane stack is prolonged, the cleaning times of the electrodialysis membrane stack are reduced, and the service life of the electrodialysis membrane stack is prolonged.

As a possible embodiment, referring to fig. 2, the waterway switching device 6 may include three flow valves, four solenoid valves, and a four-way valve 608. The three flow valves are respectively marked as a first flow valve 601, a second flow valve 602 and a third flow valve 603, the four solenoid valves are respectively marked as a first solenoid valve 604, a second solenoid valve 605, a third solenoid valve 606 and a fourth solenoid valve 607, the four-way valve 608 has two water inlet ends and two water outlet ends, the two water inlet ends are respectively a first end and a fourth end, and the two water outlet ends are respectively a second end and a third end.

As shown in fig. 6-9, in this embodiment, four-way valve 608 may include a housing, a flow field plate 320, and a rotating disc 330.

An accommodating cavity 313 is arranged in the shell, and an inlet and an outlet which are communicated with the accommodating cavity 313 are formed on the shell. The runner plate 320 is provided in the accommodation chamber 313. The flow field plate 320 may itself define an inlet chamber in communication with the inlet and an outlet chamber in communication with the outlet, or the flow field plate 320 may cooperate with the housing to define an inlet chamber in communication with the inlet and an outlet chamber in communication with the outlet. The flow channel plate 320 is also provided with a liquid inlet 321 and a liquid outlet 322, the liquid inlet 321 is communicated with the liquid inlet cavity, and the liquid outlet 322 is communicated with the liquid outlet cavity. A rotating disc 330 is rotatably arranged in the accommodating cavity 313, and the rotating disc 330 is used for connecting or disconnecting the liquid inlet port 321 and the liquid outlet port 322.

The four-way valve 608 of this embodiment, by being disposed in the flow field plate 320, can define an inlet chamber and a reservoir chamber with the flow field plate 320 to facilitate separation of a chamber in communication with the inlet and a chamber in communication with the outlet within the housing. By arranging the turntable 330, the communication state of the liquid inlet 321 and the liquid outlet 322 can be controlled by the turntable 330, so that whether the inlet is communicated with the outlet can be reliably controlled, the control mode and the control logic of the four-way valve 608 are simplified, the structure of the four-way valve 608 is simplified, and the switching effect and the switching reliability of the four-way valve 608 are improved.

Therefore, in this embodiment, the four-way valve 608 has the advantages of simple control, reliable switching structure, and the like.

The four-way valve 608 in this embodiment is described below with reference to the drawings. As shown in fig. 6-9, four-way valve 608 may include a housing, a runner plate 320, and a turntable 330.

Specifically, as shown in fig. 6, the flow path disk 320 is provided with a liquid inlet connection port 323, the liquid inlet connection port 323 is communicated with the liquid inlet cavity, and the liquid inlet connection port 323 is communicated with the inlet. Thus, the liquid inlet connecting port 323 can communicate the liquid inlet cavity and the inlet. The flow path plate 320 is provided with a liquid outlet connecting port 324, the liquid outlet connecting port 324 is communicated with the liquid outlet cavity, and the liquid outlet connecting port 324 is communicated with the outlet. So that the outlet connection port 324 can communicate the outlet chamber with the outlet. Therefore, the runner plate 320 can be used for separating a liquid inlet cavity communicated with the inlet and a liquid outlet cavity communicated with the outlet, thereby controlling the connection state of the inlet and the outlet.

Specifically, as shown in fig. 6, the runner plate 320 is detachably provided to the accommodation chamber 313, and the runner plate 320 is fixedly provided in the accommodation chamber 313 in a state where the runner plate 320 is mounted in place. The liquid inlet connection port 323 and the liquid outlet connection port 324 are formed at intervals on the side circumferential surface of the flow path disk 320, and the liquid inlet port 321 and the liquid outlet port 322 are formed at intervals on the end surface of the flow path disk 320. Therefore, liquid flowing in from the inlet enters the liquid inlet cavity through the liquid inlet connecting port 323 and then flows out of the liquid inlet cavity from the liquid inlet notch 321, when the rotary disc 330 is communicated with the liquid inlet notch 321 and the liquid outlet notch 322, the liquid can flow into the liquid outlet cavity from the liquid outlet notch 322 and flow out of the liquid outlet cavity from the liquid outlet notch 322 and then flow out from the outlet, and smooth flowing of the liquid in the four-way valve 608 is realized.

In some embodiments, the rotating disc 330 may be disposed at one end of the flow path disc 320, and the rotating disc 330 has a concave communicating groove, which can be used to connect or disconnect the liquid inlet opening 321 and the liquid outlet opening 322. For example, when the rotating disc 330 rotates to the first position, at least a part of the communicating groove is respectively connected with the liquid inlet 321 and the liquid outlet 322, so that liquid can flow from the liquid inlet 321 to the liquid outlet 322 through the communicating groove, when the rotating disc rotates to the second position, the communicating groove is staggered with the liquid inlet 321 and the liquid outlet 322, and at this time, the liquid inlet 321 and the liquid outlet 322 are blocked by the rotating disc 330 and are closed. Therefore, the relative position of the communication groove and the flow channel disc 320 can be changed by rotating the rotating disc 330, so that the relative position of the communication groove and the liquid inlet and

outlet openings

321 and 322 can be controlled, and the connection or disconnection of the liquid inlet and

outlet openings

321 and 322 can be controlled.

Specifically, as shown in fig. 6, a side surface of the rotating disk 330 facing the flow path disk 320 is recessed to form a communication groove, and a side surface of the rotating disk 330 facing away from the flow path disk 320 is provided with a transmission connecting part 333 adapted to be connected to an external transmission structure. This allows for reliable rotation of the turntable 330, and thus reliable control of the position of the communication slot.

For example, the rotating disc 330 may be formed into a cylindrical structure, one side end surface of the cylinder is attached to the end surface of the flow path disc 320 provided with the liquid inlet 321, and the side end surface of the rotating disc 330 is provided with a communicating groove. The other end face of the cylinder is provided with a transmission connecting part 333. The axis of rotation of the turntable 330 coincides with the central axis of the cylinder.

In some embodiments, as shown in fig. 6, the housing may include a base 311 and an upper cover 312, the inlet and the outlet being formed at the base 311, respectively, the upper cover 312 being detachably disposed on the base 311, the base 311 and the upper cover 312 defining a receiving chamber 313 therebetween. This not only facilitates the manufacturing of the housing, but also facilitates the assembly of the four-way valve 608 components within the housing, facilitating the assembly and maintenance of the four-way valve 608.

For example, the housing may include a base 311 and an upper cap 312, the upper cap 312 may be detachably fastened to the base 311, and the base 311 and the upper cap 312 are connected by a threaded fastener. The threaded fasteners are multiple and are distributed at intervals along the circumferential direction of the shell. The inlet and outlet ports are formed on the side circumferential surfaces of the base 311, respectively, and a receiving chamber 313 is defined between the base 311 and the upper end cover 312.

In some embodiments, as shown in fig. 6, the inlet may include a first inlet 31 and a second inlet 32 arranged at intervals, the outlet may include a first outlet 33 and a second outlet 34 arranged at intervals, the first inlet 31, the second inlet 32, the first outlet 33 and the second outlet 34 are arranged at equal intervals along the circumference of the housing, the first inlet 31 is arranged opposite to the second inlet 32, and the first outlet 33 is arranged opposite to the second outlet 34. The four-way valve 608 can be connected to two liquid inlet pipes and two liquid outlet pipes, so as to control the connection state of the liquid inlet pipes and the liquid outlet pipes. For example, the four-way valve 608 may communicate the first inlet 31 and the first outlet 33 and communicate the second inlet 32 and the second outlet 34 in the first state, and may communicate the first inlet 31 and the second outlet 34 and communicate the second inlet 32 and the first outlet 33 in the second state, thereby achieving reliable switching of the piping.

Specifically, as shown in fig. 7, the rotating disc 330 is provided with a communication groove, the communication groove may include a first groove 331 and a second groove 332, the rotating disc 330 is capable of rotating between a first position and a second position, when the rotating disc 330 rotates to the first position, the first groove 331 is capable of communicating the first inlet 31 and the first outlet 33, and the second groove 332 is capable of communicating the second inlet 32 and the second outlet 34. This allows a way of connecting the pipes. When the rotating disc 330 rotates to the second position, the first groove 331 can communicate the first inlet 31 and the second outlet 34, and the second groove 332 can communicate the second inlet 32 and the first outlet 33. This may allow for another way of connecting the lines.

Further, the first and

second grooves

331 and 332 extend in the circumferential direction of the turntable 330 and are spaced apart from each other on the turntable 330, and the turntable 330 can be rotated back and forth between a first position and a second position, and the rotation angle of the turntable 330 is set to be less than 180 degrees. For example, the rotation angle of the dial 330 may be 150 degrees, 120 degrees, or 90 degrees.

Specifically, the first groove 331 and the second groove 332 extend in the circumferential direction of the turntable 330 and are oppositely disposed on the turntable 330, and the turntable 330 can rotate back and forth between a first position and a second position, and the rotation angle of the turntable 330 is 90 degrees.

In some embodiments, as shown in FIG. 6, the four-way valve 608 further comprises a driving device 350, the driving device 350 is disposed on the housing, and the driving device 350 is provided with a rotatable shaft capable of being in transmission connection with the rotating disc 330. Therefore, the driving device 350 can drive the turntable 330 to rotate, and an accurate and reliable action process of the turntable 330 is realized.

Specifically, the driving device 350 may be provided at an outer side of the housing, the housing having a mounting hole 3121, the mounting hole 3121 communicating with the accommodating chamber 313, and the rotation shaft capable of protruding into the accommodating chamber 313 through the mounting hole 3121. This not only facilitates the installation of the driving device 350, facilitates the protection of the driving device 350, but also facilitates the driving connection between the driving device 350 and the turntable 330.

Specifically, the driving device 350 may be a motor, which is mounted on the outer surface of the housing, and a rotating shaft of the motor extends into the accommodating cavity 313 through the mounting hole 3121 to be connected to the rotating disc 330.

Alternatively, the driving device 350 may be provided with a signal receiver for receiving the driving signal. The driving device 350 can rotate in forward direction or reverse direction according to the received driving signal, so as to drive the turntable 330 to rotate in forward direction or reverse direction.

For example, the driving signal may be a pulse signal, and the motor may receive a positive pulse signal with a fixed number of pulses or a negative pulse signal with a fixed number of pulses.

In some embodiments of the present invention, four-way valve 608 is used in water purification system 100. The four-way valve 608 is composed of a motor, an upper end shell, a rotating shaft, a rotating disc 330, a sealing ring, a runner disc 320 and a base 311, and the main core components are the runner disc 320 and the rotating disc 330. The four-way valve I has two working states. When the four-way valve starts to work, the motor does not work, the turntable 330 is in an initial state as shown in fig. 8, and the first end is communicated with the second end through the communication groove of the turntable 330, and the third end is communicated with the fourth end. When the motor receives a positive pulse signal with a fixed pulse number, the output torque rotates the turntable 330 clockwise by 90 °, and the state is as shown in fig. 9, the first end and the third end are communicated, and the second end and the fourth end are communicated through the communication groove of the turntable 330. When the pole is reversed again, the motor receives a reverse pulse signal with a fixed pulse number, outputs torque to enable the rotating disc 330 to rotate 90 degrees anticlockwise, and enables the first end to be communicated with the second end and the third end to be communicated with the fourth end through the communicating groove of the rotating disc 330. The turntable 330 rotates once every time the motor receives a pulse signal. The electric control program gives signals to the motor, the flow channel passing through the four-way valve can be controlled, the automatic switching of the water channel is realized, and the complexity of the system is greatly reduced.

In some examples, the four-way valve 608 is connected to the water purification system 100, and has a first end and a fourth end connected to the two water outlet pipes of the membrane stack, respectively, and a second end and a third end connected to the pure water path and the waste water path of the system, respectively. Through the automatically controlled control to the cross valve, at the electrodialysis membrane stack before falling the utmost point and the system water in-process after falling the utmost point, ensure that the pure water route only flows out the purified water, the concentrated water is only flowed out in the waste water route, guarantee that play water quality of water is not influenced by the electrodialysis membrane stack falls the utmost point. When the electrodialysis membrane stack is positively charged to produce water, the four-way valve is not powered, the first end of the four-way valve is communicated with the second end, and the third end of the four-way valve is communicated with the fourth end; after raw water enters the membrane stack, under the action of an electric field, purified water and concentrated water are separated into a path and come out of the membrane stack, the purified water and the concentrated water are respectively connected with the four-way valve through the first end runner and the fourth end runner, the purified water flows out of the pure water waterway through the second port of the four-way valve through the internal runner of the four-way valve, and the concentrated water flows out of the wastewater waterway through the third port of the four-way valve. When the reverse electricity is used for water production after the pole is reversed, the four-way valve is powered up to enable the turntable 330 to rotate 90 degrees clockwise, the first end is communicated with the third end, and the second end is communicated with the fourth end; after raw water enters the membrane stack, under the action of an electric field, purified water and concentrated water are separated into a path and come out of the membrane stack, the purified water and the concentrated water are respectively connected with the four-way valve through the fourth end and the first port, the purified water flows out of the pure water waterway through the second port of the four-way valve through an internal flow passage of the four-way valve, and the concentrated water flows out of the wastewater waterway through the third port of the four-way valve. The reverse polarity is performed again after the reverse electricity water making is completed, at the moment, the four-way valve is electrified to enable the rotating disc 330 to rotate 90 degrees anticlockwise, the first end flow channel and the second end flow channel are communicated through the communicating groove of the rotating disc 330, and the third end flow channel are communicated to perform positive electricity water making.

By utilizing the electric control of the four-way valve, the pure water waterway is ensured to only discharge purified water all the time and the waste water waterway is ensured to only discharge concentrated water all the time in the process of electrodialytic membrane pile positive water making and reverse electricity water making after electrode reversing, so that the water quality of the discharged water is ensured to the maximum extent. Through adding a cross valve, replace the effect of four traditional solenoid valves, realized EDR control system's intelligent self-cleaning simultaneously greatly reduced the system complexity.

As shown in fig. 2, the water pump 3 is connected to one end of a first flow valve 601, the other end of the first flow valve 601 is connected to one end of a second flow valve 602 to form a first node, the other end of the second flow valve 602 is connected to the water inlet end of the first water chamber 401, the first node is connected to one end of a third flow valve 603, and the other end of the third flow valve 603 is connected to the water inlet end of the second water chamber 402.

In this embodiment, the first flow valve 601, the second flow valve 602, and the third flow valve 603 may be all electromagnetic flow valves, and the flow rate of the electromagnetic flow valves is controllable, which is also convenient for the controller 7 to control. The electromagnetic valve is a valve body controlled by electromagnetic, and the working principle is as follows: there is inclosed chamber in the solenoid valve, it has the through-hole to open in the different positions, the different oil pipe of every jogged joint, be the piston in the middle of the chamber, the two sides is two electro-magnets, which side's magnet coil circular telegram valve body will be attracted which side, the removal through the control valve body opens or closes different oil discharge hole, and the inlet port is normally open, hydraulic oil will get into different oil discharge pipe, then the piston that promotes the hydro-cylinder through the pressure of oil, the piston drives the piston rod again, the piston rod drives mechanical device, consequently, the electric current break-make of control electro-magnet just can control mechanical motion.

The second flow valve 602 and the third flow valve 603 are preferably electromagnetic flow valves of the same type. In this embodiment, the maximum flow rate of the first flow valve 601 is greater than the maximum flow rate of the second flow valve 602 and greater than the maximum flow rate of the third flow valve 603, for example, the maximum flow rate of the first flow valve 601 is 1500, and the maximum flow rates of the second flow valve 602 and the third flow valve 603 are both 300.

In this embodiment, referring to fig. 2, one end of the second flow valve 602 is connected to the water inlet end of the first water chamber 401 of the electrodialysis membrane stack 4, and one end of the third flow valve 603 is connected to the water inlet end of the second water chamber 402 of the electrodialysis membrane stack 4; and the other ends of the second flow valve 602 and the third flow valve 603 are connected with one end of the water pump 3 through the first flow valve 601. Therefore, in the case where the water pump 3 and the first flow valve 601 are opened, the inflow direction of the raw water can be controlled by controlling the second flow valve 602 and the third flow valve 603, that is, the second flow valve 602 is opened, the third flow valve 603 is closed, the raw water enters the first water chamber 401 of the electrodialysis membrane stack 4, the third flow valve 603 is opened, the second flow valve 602 is closed, and the raw water enters the second water chamber 402 of the electrodialysis membrane stack 4.

Referring to fig. 2, one end of a first solenoid valve 604 is connected to a water outlet, one end of a second solenoid valve 605 is connected to a waste water tank, one end of a third solenoid valve 606 is connected to the other end of the first solenoid valve 604 to form a second node, one end of a fourth solenoid valve 607 is connected to a raw water tank, the other end of the second solenoid valve 605 is connected to the other end of the fourth solenoid valve 607 to form a third node, the other end of the third solenoid valve 606 is connected to the other end of the fourth solenoid valve 607 to form a fourth node, and the fourth node is connected to the third node. A first end of four-way valve 608 is connected to the water outlet of first water compartment 401, a second end of four-way valve 608 is connected to the second node, a third end of four-way valve 608 is connected to the third node, and a fourth end of four-way valve 608 is connected to the water outlet of second water compartment 402.

In this embodiment, referring to fig. 2, a first end of a four-way valve 608 is connected to the water outlet end of the first water chamber 401 of the electrodialysis membrane stack 4, a fourth end of the four-way valve 608 is connected to the water outlet end of the second water chamber 402 of the electrodialysis membrane stack 4, a second end of the four-way valve 608 is connected to the raw water tank 101 through a third solenoid valve 606 and a fourth solenoid valve, a third end of the four-way valve 608 is connected to the waste water tank through a second solenoid valve 605, and a second end of the four-way valve 608 is further connected to the water outlet 5 through the first solenoid valve 604.

When the four-way valve 608 is adjusted such that the first end of the four-way valve 608 is communicated with the second end of the four-way valve 608 and the third end of the four-way valve 608 is communicated with the fourth end of the four-way valve 608, the water flowing out of the water outlet of the first water chamber 401 of the electrodialysis membrane stack 4 can flow to the first end of the four-way valve 608, the second end of the four-way valve 608 and the first node in sequence. Further, adjusting the first, third, and

fourth solenoid valves

604, 606, 607 may further control the direction of water flow. The water from the water outlet of the second water chamber 402 of the electrodialysis membrane stack 4 can flow to the fourth end of the four-way valve 608, the third end of the four-way valve 608, the second solenoid valve 605 and the waste water tank.

Wherein, the four-way valve 608 is adjusted to make the first end of the four-way valve 608 communicated with the third end of the four-way valve 608, and when the second end of the four-way valve 608 is communicated with the fourth end of the four-way valve 608, the water flowing out from the water outlet end of the first water chamber 401 of the electrodialysis membrane stack 4 flows to the first end of the four-way valve 608, the third end of the four-way valve 608, the second electromagnetic valve 605 and the waste water tank in turn, and the water flowing out from the water outlet end of the second water chamber 402 of the electrodialysis membrane stack 4 flows to the second end of the four-way valve 608, the fourth end of the four-way valve 608 and the third node in turn. Further, adjusting the second 605, third 606, and fourth 607 solenoid valves can further control the water flow direction.

From this, can be through the state of adjusting 6 each valves in water route auto-change over device, realize the control to water purification system 100 water route, make electrodialysis membrane stack 4 before the utmost point of falling and the system water process after the utmost point of falling, all can ensure that delivery port 5 only flows out the water after the purification, waste water tank 102 only flows into concentrated waste water, guarantees that water quality of water is not influenced by electrodialysis membrane stack 4 utmost point of falling.

In this embodiment, the controller 7 is connected to a first flow valve 601, a second flow valve 602, a third flow valve 603, a first solenoid valve 604, a second solenoid valve 605, a third solenoid valve 606, a fourth solenoid valve 607, and a four-way valve 608, respectively. The controller 7 controls the opening degrees of the first flow valve 601, the second flow valve 602, and the third flow valve 603, controls the opening and closing of the first electromagnetic valve 604, the second electromagnetic valve 605, the third electromagnetic valve 606, and the fourth electromagnetic valve 607, and adjusts the communication state of each port inside the four-way valve 608 according to the water preparation mode, thereby achieving the purpose of switching the water paths of the water purification system 100.

In one embodiment of the present invention, the water production modes of the water purification system 100 may include a positive water production mode and a reverse water production mode.

In the embodiment of the present invention, the water outlet 5 is used for discharging purified water purified by the water purification system 100. A water outlet button can be arranged at the water outlet 5, and the controller 7 is further connected with the water outlet button and is used for receiving an electric signal sent by the water outlet button when the water outlet button is pressed, so as to confirm that the water purification system 100 enters a water making mode, and determine that the water purification system 100 enters a standby mode when the water outlet button is pressed again.

For better water purification, referring to fig. 1, a pre-filter 9 can be arranged on the water inlet side of the electrodialysis membrane stack 4, and a post-filter 10 can be arranged on the water outlet side of the electrodialysis membrane stack.

As a feasible implementation manner, the pre-filter element 9 may be disposed between the water pump 3 and the first flow valve 601, that is, the position before the raw water enters the electrodialysis membrane stack 4, so that the pre-filter element 9 is disposed to ensure that large particles such as silt and rust generated in the raw water pipe network cannot enter subsequent pipes, thereby preventing the subsequent pipes and equipment from being blocked or damaged, and protecting the subsequent pipes and equipment.

As a possible implementation, the post-filter cartridge 10 may be disposed between the first solenoid valve 604 and the water outlet 5, so as to further improve the purity of the outlet water. The front filter element 9 can be an activated carbon filter element for removing impurities and residual chlorine in raw water, and the rear filter element 10 can be a UV sterilization filter element for further sterilizing purified water purified by the electrodialysis membrane stack 4.

In one embodiment of the present invention, referring to fig. 1, the water purification system 100 may further include a second detector 8 and a power supply module 11.

The second detector 8 is used for detecting the total dissolved solid value of the effluent of the water purification system 100 to obtain the effluent TDS; wherein the controller 7 is further connected to a second detector 8 for adjusting the voltage applied to the electrodialysis module 4 in dependence on the effluent TDS.

In this embodiment, referring to fig. 1, a second detector 8 may be disposed between the post-filter element 10 and the water outlet 5 to detect the TDS of the outlet water of the water purification system 100, so as to obtain the outlet water TDS. According to the obtained TDS value of the effluent, the mg of dissolved solids in each liter of purified water purified by the electrodialysis membrane stack 4 and the water quality condition of the effluent of the water purification system 100 can be known. Wherein the second detector 8 may employ a TDS sensor.

The power supply module 11 can be electrically connected with the electrodialysis membrane stack 4 and used for supplying power to the electrodialysis membrane stack; wherein, the controller 7 is also connected with the power supply module 11 and is used for adjusting the voltage polarity applied to the electrodialysis membrane stack 4 by the power supply module 11 according to the water production mode.

Specifically, as described above, the water production mode of the water purification system 100 includes positive water production and reverse water production. Can confirm the time of falling utmost point according to the incoming water TDS that second detector 2 detected, the value of incoming water TDS is different, and the time of falling utmost point is also different, and wherein, the incoming water TDS can be with the time of falling utmost point and be negative correlation. That is, the larger the TDS of the feed water is, the poorer the water quality is, and the more easily dirt is accumulated on one side of the electrodialysis membrane stack 4 when the electrodialysis membrane stack 4 is purifying water, and in order to prevent the side of the electrodialysis membrane stack 4 from accumulating more dirt, causing clogging and bearing pressure, the more quickly the electrodialysis membrane stack 4 needs to be inverted, so the inversion time is shorter. As an example, the TDS of the feed water versus the down time can be as shown in Table 1 below.

TABLE 1

Influent TDS/ppm	Pole-reversing time N/min
		Less than 150	60
Greater than 150 and less than 300	30
		Greater than 300	10

When the water purification system 100 starts to produce water, recording the water using time of the water purification system 100 for producing water in the current water production mode, comparing the water using time with the pole inverting time, and when the water using time is less than or equal to the pole inverting time, indicating that under the current water quality of inlet water, dirt accumulated in the dense water chamber of the electrodialysis membrane stack 4 is not enough to cause harm, so that the water production mode does not need to be switched, namely, the pole inverting is not needed, and the current water production mode is not changed; when the water using time is longer than the pole reversing time, the situation that dirt accumulated in the concentrated water chamber of the electrodialysis membrane stack 4 can cause one side of the electrodialysis membrane stack 4 to be blocked or bear pressure is shown, so that the water making mode needs to be switched, namely, the pole reversing is carried out, and the current water making mode is changed.

It should be noted that the current water preparation mode is not changed, that is, the current water preparation mode of the water purification system 100 is positive water preparation, the positive water preparation is continued, and the current water preparation mode of the water purification system 100 is reverse water preparation, and the reverse water preparation is continued. The current water making mode is changed, that is, the current water making mode of the water purification system 100 is positive water making, the current water making mode is reverse electricity water making, and the current water making mode of the water purification system 100 is reverse electricity water making, the current water making mode is positive water making. Wherein, the water production mode of the water purification system 100 can be changed by changing the voltage polarity of the power supply 11. The traditional membrane separation process is mainly a pressure-driven membrane process and comprises microfiltration, ultrafiltration, nanofiltration and reverse osmosis, wherein the microfiltration and the ultrafiltration generally have larger flux, but the rejection rate of the microfiltration and the ultrafiltration to small molecular solutes is lower; nanofiltration and reverse osmosis have higher rejection rate of small-molecular solutes, but face the problems of higher energy consumption, serious membrane pollution and the like. Compare in traditional pressure drive membrane process, change the positive and negative electrode that electrodialysis membrane stack 4 made the pollutant desorption on membrane surface through the voltage polarity that changes power supply 11, can reduce membrane pollution, be convenient for detach the incrustation scale in the electrodialysis membrane stack 4, improve the operational reliability and the stability of electrodialysis membrane stack 4, extension electrodialysis membrane stack 4 life.

The water preparation modes are different, the flow directions of positive and negative ions in the electrodialysis membrane stack are different, and the inlet water concentration corresponding to the first water chamber 401 and the second water chamber 402 is also different, so that the states of the valves of the water path switching device 6 need to be changed.

Specifically, when water is produced positively, the states of the valves of the water path switching device 6 are: the third flow valve 603 is closed, the first flow valve 601 and the second flow valve 602 are opened, the first solenoid valve 604 and the second solenoid valve 605 are opened, the first end and the second end of the four-way valve 608 are communicated, the third end and the fourth end are communicated, and the third solenoid valve 606 and the fourth solenoid valve 606 are closed, as shown in table 2 below. Meanwhile, the current applied to the electrodialysis membrane stack 4 by the power supply 11 and the pump water flow rate of the water pump 3 may be set according to the effluent TDS, which may be shown in table 2 below.

TABLE 2

That is, in the positive electric water preparation mode, the first water chamber 401 is a fresh water chamber, the second water chamber 402 is a concentrated water chamber, when the electrodialysis membrane stack 4 is used for purifying water, raw water in the raw water tank 101 enters from the water inlet end of the first water chamber 401 under the action of the water pump 3, after the electrodialysis membrane stack 4 purifies the raw water, the raw water flows through the first end, the second end and the first electromagnetic valve 604 of the four-way valve 608 from the water outlet end of the first water chamber 401, and then flows out from the water outlet 5, and wastewater in the second water chamber 402 flows into the wastewater tank 102 from the fourth end, the third end and the second electromagnetic valve 605 of the four-way valve 608.

During the water of the anti-electricity, the state of each valve of water route auto-change over device 6 is: the second flow valve 602 is closed, the first flow valve 601 and the third flow valve 603 are opened, the first solenoid valve 604 and the second solenoid valve are opened 605, the first end and the third end of the four-way valve 608 are communicated, the second end and the fourth end are communicated, and the third solenoid valve 606 and the fourth solenoid valve 607 are closed, as shown in table 3 below. Meanwhile, the current applied to the electrodialysis membrane stack 4 by the power supply 11 and the pump water flow rate of the water pump 3 may be set according to the effluent TDS, as shown in table 3 below.

TABLE 3

That is, in the reverse electric water preparation mode, the first water chamber 401 is a concentrated water chamber, the second water chamber 402 is a fresh water chamber, when the electrodialysis membrane stack 4 is used for purifying water, raw water in the raw water tank 101 enters from the water inlet end of the second water chamber 402 under the action of the water pump 3, after the electrodialysis membrane stack 4 purifies the raw water, the raw water flows from the water outlet end of the second water chamber 402 through the fourth end, the second end and the first electromagnetic valve 604 of the four-way valve 608, and then flows out from the water outlet 5, and wastewater in the first water chamber 401 flows into the wastewater tank 102 from the first end, the third end and the second electromagnetic valve 605 of the four-way valve 608.

As an example, the water outlet flow of the water pump 3 may be determined according to the water outlet TDS, that is, the corresponding relationship between the water outlet TDS and the water outlet flow of the water pump 3 may be pre-established, and then the water outlet flow of the water pump 3 may be determined according to the water outlet TDS when water is produced.

It should be noted that the water outlet flow rate V_{Flow rate of flow}Current I applied to the electrodialysis membrane stack 4_{Electric current}TDS of the outlet water, TDS of the inlet water and voltage V of the water pump 3_{Pump voltage}The relationship between may be:

V_{flow rate of flow}＝40.543*V_{Pump voltage}-102.636。

When water production control is carried out, V can be obtained by calculation according to the formula_{Pump voltage}Then, corresponding voltage is applied to the water pump 3, and the water pump 3 can be controlled according to the flow of the pump water; the TDS of the effluent can be calculated according to the formula, and the water purification effect can be determined according to the calculated TDS of the effluent and the detected TDS of the effluent.

In summary, in the water purification system 100 provided in the embodiment of the present invention, the water path switching device 6 is disposed between the water pump 3, the water tank 1, the electrodialysis membrane stack 4 and the water outlet 5, and the water path and the water production mode of the water purification system 100 are switched in time according to the water inlet condition of the water purification system 100, so as to prolong the scaling time inside the electrodialysis membrane stack 4, reduce the number of times of cleaning the electrodialysis membrane stack 4, and prolong the service life of the electrodialysis membrane stack 4.

Based on the water purification system 100 of the above embodiment, the present invention provides a control method of the water purification system.

Fig. 3 is a flowchart illustrating a control method of a water purification system according to an embodiment of the present invention, and as shown in fig. 3, the control method of the water purification system includes the following steps:

step S11, a feed water TDS is obtained, wherein the feed water TDS is a total dissolved solids value (TDS) of the feed water of the water purification system.

Specifically, the TDS of the water entering the water purification system 100 can be collected by the TDS sensor, and the data collected by the TDS sensor can be acquired to obtain the TDS of the water entering.

Step S12, determining the pole-reversing time according to the incoming water TDS.

Specifically, in the operation process of the electrodialysis membrane stack 4, the polarities of the positive and negative electrodes of the electrodialysis membrane stack 4 are inverted once every certain time, and the inverting time in the invention is the interval time between the polarities of the positive and negative electrodes of the electrodialysis membrane stack 4 being inverted once. Since TDS reflects the condition of water quality, a larger value of TDS, i.e., more dissolved solids per liter of water, indicates a poorer water quality. Therefore, the larger the TDS of the inlet water is, the worse the water quality is, and the more easily dirt is accumulated on one side of the electrodialysis membrane stack 4 when the electrodialysis membrane stack 4 is purifying water, and in order to prevent the side of the electrodialysis membrane stack 4 from accumulating more dirt to cause blockage and pressure bearing, the electrode inversion time is shorter because the electrodialysis membrane stack 4 needs to be inverted as soon as possible.

Further specifically, determining the time to pole may include: detecting that the TDS of the inlet water is less than a first preset value, and determining that the pole-reversing time is first time; detecting that the TDS of the inlet water is greater than or equal to a first preset value and smaller than a second preset value, and determining that the pole inverting time is a second time, wherein the second time is smaller than the first time; and determining that the incoming water TDS is greater than or equal to a second preset value, and determining that the pole-reversing time is a third time, wherein the third time is less than the second time.

Wherein the first predetermined value can be 100-200 ppm, such as 150 ppm; the second predetermined value can be 250-350 ppm, such as 300 ppm; the first time can be 45-75 min, such as 60 min; the second time period can be 15-45 min, such as 20 min; the third time period may be 5-15 min, such as 10 min.

And step S13, determining the water making mode according to the pole reversing time.

Specifically, after the water purification system 100 adopts a positive electricity water production mode or a reverse electricity water production mode for a period of time, because of the directional movement of ions, the concentration in the water chamber on one side of the electrodialysis membrane stack 4 can be increased, in order to prevent more dirt from being accumulated, after the water purification system 100 runs for a certain time (electrode reversing time) in a certain water production mode, the water production mode needs to be changed, namely, the directional movement of the ions in the electrodialysis membrane stack 4 is changed, so that the positive and negative electrodes of the electrodialysis membrane stack 4 are changed to desorb the pollutants on the membrane surface, the membrane pollution can be reduced, the working reliability and stability of the electrodialysis membrane stack 4 are improved, and the service life of the electrodialysis membrane stack 4 is prolonged.

Further specifically, determining the water production mode according to the pole-reversing time may include: when the water purification system 100 produces water, recording the water consumption time of the water purification system 100 in the current water production mode; the water application time was compared to the pole reversal time. Namely, judging the water consumption time and the pole inverting time; when the water using time is less than or equal to the pole inverting time, the water making mode is not switched; and when the water using time is longer than the pole reversing time, switching the water making mode. It should be noted that the current water preparation mode is not changed, that is, the current water preparation mode of the water purification system 100 is positive water preparation, the positive water preparation is continued, and the current water preparation mode of the water purification system 100 is reverse water preparation, and the reverse water preparation is continued. The current water making mode is changed, that is, the current water making mode of the water purification system 100 is positive water making, the current water making mode is reverse electricity water making, and the current water making mode of the water purification system 100 is reverse electricity water making, the current water making mode is positive water making.

Wherein, when the water using time is longer than the pole-reversing time, the switching of the water making mode may include: the first flow valve 601, the second flow valve 602, the third flow valve 603, the first solenoid valve 604, the second solenoid valve 605, the third solenoid valve 606, the fourth solenoid valve 607 and the four-way valve 608 are controlled to be fully closed, and the water use time is cleared. The clear water usage time is to calculate the time for the water purification system 100 to operate in the changed water production mode, so as to change the water production mode next time.

And step S14, controlling the applied voltage of the water pump, the water path switching device and the electrodialysis membrane stack according to the determined water making mode when the water is made in the water purifying system.

Specifically, referring to fig. 2, the controlling the applied voltages of the water pump 3, the waterway switching device 6 and the electrodialysis membrane stack 4 according to the determined water production mode may include: the third flow valve 603 is controlled to be closed, the first flow valve 601 and the second flow valve are controlled to be opened 602, the first electromagnetic valve 604 and the second electromagnetic valve 605 are controlled to be opened, the first end and the second end of the four-way valve 608 are controlled to be communicated, the third end and the fourth end of the four-way valve 608 are controlled to be communicated, the third electromagnetic valve 606 and the fourth electromagnetic valve 607 are controlled to be closed, and the water pump 3 is controlled to be started. That is, in the positive electric water preparation mode, when the first water chamber 401 of the electrodialysis membrane stack 4 is a fresh water chamber and the second water chamber 401 is a concentrated water chamber, the first flow valve 601, the second flow valve 602, the first water chamber 401 of the electrodialysis membrane stack 4, the first end and the second end of the four-way valve 608, and the first electromagnetic valve 604 are communicated with each other to form a fresh water channel. A concentrated water channel is formed among the second water chamber 401 of the electrodialysis membrane stack 4, the fourth end and the third end of the four-way valve 608 and the second electromagnetic valve 605.

Or, the second flow valve 602 is controlled to be closed, the first flow valve 601 and the third flow valve 603 are controlled to be opened, the first electromagnetic valve 604 and the second electromagnetic valve 605 are controlled to be opened, the first end and the third end of the four-way valve 608 are controlled to be communicated, the second end and the fourth end of the four-way valve 608 are controlled to be communicated, the third electromagnetic valve 606 and the fourth electromagnetic valve 607 are controlled to be closed, and the water pump 3 is controlled to be started. In the reverse electric water production mode, when the first water chamber 401 of the electrodialysis membrane stack 4 is a concentrated water chamber and the second water chamber 401 is a fresh water chamber, the first flow valve 601, the third flow valve 603, the second water chamber 401 of the electrodialysis membrane stack 4, the fourth end and the second end of the four-way valve 608, and the first electromagnetic valve 604 are communicated with each other to form a fresh water channel. A concentrated water channel is formed among the first water chamber 401 of the electrodialysis membrane stack 4, the first end and the third end of the four-way valve 608 and the second electromagnetic valve 605.

It can be seen that no matter in the positive electricity water making mode or the reverse electricity water making mode, the water flowing out from the second end of the four-way valve 608 is purified, the water flowing out from the third end is concentrated water, and a concentrated water waterway is not crossed with a fresh water waterway, so that the water purifying quality of the water purifying system 100 can be ensured.

In an embodiment of the present invention, the control method of the water purification system may further include: acquiring a discharged water TDS, and determining the current applied to the electrodialysis membrane stack 4 and the pump water flow of the water pump 3 according to the discharged water TDS, wherein the discharged water TDS is the total dissolved solid value of the discharged water of the water purification system 100; the power supply 11 of the electrodialysis membrane stack 4 is controlled according to the current and water production modes, the water pump 3 is controlled according to the water pumping flow, and the water path switching device 6 is controlled to produce water.

Wherein, the TDS of water purification system 100 play water also can be gathered through the TDS sensor, and the data of acquireing the TDS sensor collection can obtain out water TDS.

The working flow of the water purification system according to the embodiment of the present invention is described in a specific embodiment with reference to fig. 1, fig. 2, and fig. 4 as follows:

in this embodiment, referring to fig. 4, when the water purification system produces water, i.e., the switch button at the water outlet is pressed, the incoming water TDS of the water purification system 100 is acquired, and the polarity reversing time of the electrodialysis membrane stack 4 is determined according to the acquired incoming water TDS. If the water-using time of the water purification system 100 in the current water-making mode is less than the pole-reversing time, the water-making is continued in the current water-making mode. If the current water production mode is positive water production, the third flow valve 603 is controlled to be closed, the first flow valve 601 and the second flow valve 602 are opened, the first electromagnetic valve 604 and the second electromagnetic valve 605 are opened, the first end and the second end of the four-way valve 608 are communicated, the third end and the fourth end are communicated, after a certain time is 20s, the water pump 3 is started, corresponding flow rate power is set, and meanwhile, corresponding current A1 is applied to the electrodialysis membrane stack 4 according to the TDS of the effluent to enable the electrodialysis membrane stack 4 to continuously produce water.

In the positive water production process, the water using time is recorded in real time, the water using time is compared with the pole inverting time according to the recorded water using time, whether the water using time is larger than the pole inverting time is judged, if the water using time is smaller than or equal to the pole inverting time, the water production mode of the water purification system 100 is not switched, and the electrodialysis membrane stack 4 continues to produce water in the current mode. And if the water using time is longer than the pole reversing time, switching the water making mode of the water purifying system 100 to reverse the poles of the electrodialysis membrane stack 4. Specifically, after all the valves of the waterway switching device 6 are closed and the water use time is cleared, the water making mode is switched, and the positive electric water making mode is switched to the reverse electric water making mode. During the reverse electricity water production, the second flow valve 602 is controlled to be closed, the first flow valve 601, the third flow valve 603 are opened, the first electromagnetic valve 604 and the second electromagnetic valve 605 are opened, the first end of the four-way valve 608 is communicated with the third end, the second end of the four-way valve 608 is communicated with the fourth end, the third electromagnetic valve 606 and the fourth electromagnetic valve 607 are closed, after a certain time such as 20s, the water pump 3 is started, corresponding flow rate power is set, and meanwhile, corresponding current A1 is applied to the electrodialysis membrane stack 4 according to the effluent TDS, so that the electrodialysis membrane stack 4 continuously produces water.

Correspondingly, in the process of reverse electric water making, the water using time needs to be recorded so as to facilitate the next water making mode switching. After the water purification system 100 finishes reverse power water making, the third electromagnetic valve 606 and the fourth electromagnetic valve 607 are controlled to be opened, the first electromagnetic valve 604 and the second electromagnetic valve 605 are closed, the water pump 3 is closed, the power supply 11 is closed, and the water purification system 100 enters a standby mode. When the water production of the water purification system 100 is finished, the third electromagnetic valve 606 and the fourth electromagnetic valve 607 are opened, so that the purified water in the purified water outlet waterway flows back to the raw water tank 102.

To illustrate the control effect of the water purification system 100 of the present invention on the scaling condition inside the electrodialysis membrane stack 4, relevant experiments were performed. The realization shows that the electrodialysis membrane stack 4 starts scaling after working for 180 hours under the condition that the water production mode is not switched, and the scaling time of the electrodialysis membrane stack 4 is prolonged to 700 hours under the condition that the water channel and the water production mode of the water purification system 100 are switched according to the water quality condition, so that the water production effect of the water purification system is greatly improved.

According to the control method of the water purification system provided by the embodiment of the invention, the water path and the water production mode of the water purification system 100 are switched in time according to the water inlet condition of the water purification system 100, so that the scaling time in the electrodialysis membrane stack 4 is prolonged, the cleaning times of the electrodialysis membrane stack 4 are reduced, and the service life of the electrodialysis membrane stack 4 is prolonged.

The present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of controlling a water purification system as set forth in an embodiment of the second aspect of the invention.

The invention provides an electronic device, which comprises a memory and a processor, wherein the memory is stored with a computer program, and the computer program is executed by the processor to realize the control method of the water purification system provided by the embodiment of the second aspect of the invention.

The invention also provides a water purifying device.

Fig. 5 is a schematic structural view of a water purifying apparatus according to an embodiment of the present invention. As shown in fig. 5, the water purifying apparatus 200 includes the water purifying system 100 according to the embodiment of the first aspect of the present invention, or the electronic apparatus according to the embodiment of the fourth aspect of the present invention.

According to the water purification device 200 provided by the embodiment of the invention, by using the water purification system 100 or the electronic device, the water path and the water production mode of the water purification system 100 can be switched in time according to the water inlet condition of the water purification system 100, so that the scaling time in the electrodialysis membrane stack 4 is prolonged, the cleaning times of the electrodialysis membrane stack 4 are reduced, and the service life of the electrodialysis membrane stack 4 is prolonged.

It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A water purification system, characterized in that the system comprises:

a water tank;

the first detector is used for detecting the total dissolved solid value of the inlet water of the water purification system to obtain inlet water TDS;

the water pump is connected to a water path of the water purification system;

an electrodialysis membrane stack and a water outlet;

the water path switching device is respectively connected with the water pump, the water tank, the electrodialysis membrane stack and the water outlet and is used for switching the water path of the water purification system;

and the controller is used for determining the pole-reversing time according to the TDS of the inlet water, determining a water production mode according to the pole-reversing time, and controlling the applied voltage of the water pump, the water path switching device and the electrodialysis membrane stack according to the determined water production mode when the water purification system produces water.

2. The water purification system of claim 1, wherein the water tank comprises a raw water tank and a waste water tank, the electrodialysis membrane stack comprises a first water chamber and a second water chamber, and the water path switching device comprises:

one end of the first flow valve is connected with the water pump, the other end of the first flow valve is connected with one end of the second flow valve to form a first node, the other end of the second flow valve is connected with the water inlet end of the first water chamber, one end of the third flow valve is connected with the first node, and the other end of the third flow valve is connected with the water inlet end of the second water chamber;

one end of the first electromagnetic valve is connected with the water outlet, one end of the second electromagnetic valve is connected with the wastewater tank, one end of the third electromagnetic valve is connected with the other end of the first electromagnetic valve to form a second node, one end of the fourth electromagnetic valve is connected with the raw water tank, the other end of the second electromagnetic valve is connected with the other end of the fourth electromagnetic valve to form a third node, the other end of the third electromagnetic valve is connected with the other end of the fourth electromagnetic valve to form a fourth node, and the fourth node is connected with the third node;

a first end of the four-way valve is connected with a water outlet end of a first water chamber of the electrodialysis membrane stack, a second end of the four-way valve is connected with the second node, a third end of the four-way valve is connected with the third node, and a fourth end of the four-way valve is connected with a water outlet end of a second water chamber of the electrodialysis membrane stack;

wherein the controller is connected to the first flow valve, the second flow valve, the third flow valve, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, and the four-way valve, respectively.

3. The water purification system of claim 1, wherein the system comprises:

the front filter element is arranged on the water inlet side of the electrodialysis membrane stack;

and the post-positioned filter element is arranged on the water outlet side of the electrodialysis membrane stack.

4. The water purification system of claim 1, wherein the system comprises:

the second detector is used for detecting the total dissolved solid value of the effluent of the water purification system to obtain the effluent TDS;

wherein the controller is further configured to adjust the voltage applied to the electrodialysis module in accordance with the effluent TDS.

5. The water purification system of claim 1, further comprising:

the power supply module is connected with the electrodialysis membrane stack and used for supplying power to the electrodialysis membrane stack;

wherein the controller is further configured to adjust the polarity of the voltage applied to the electrodialysis membrane stack by the power supply module according to the water production mode.

6. A method of controlling a water purification system, for use in a water purification system according to any one of claims 1-5, the method comprising the steps of:

acquiring a feed water TDS, wherein the feed water TDS is a total dissolved solids value of the feed water of the water purification system;

determining the pole-reversing time according to the TDS of the inlet water;

determining a water making mode according to the pole inverting time;

and when the water purification system produces water, controlling the applied voltage of the water pump, the waterway switching device and the electrodialysis membrane stack according to the determined water production mode.

7. The method of controlling a water purification system of claim 6, wherein said determining a polarity reversal time based on said incoming water TDS comprises:

detecting that the TDS of the inlet water is smaller than a first preset value, and determining that the pole-reversing time is first time;

detecting that the incoming water TDS is greater than or equal to the first preset value and smaller than a second preset value, and determining that the pole-reversing time is a second time, wherein the second time is smaller than the first time;

and determining that the incoming water TDS is greater than or equal to the second preset value, and determining that the pole-reversing time is a third time, wherein the third time is less than the second time.

8. The method of claim 7, wherein the determining the water production mode according to the pole reversal time comprises:

when the water purification system produces water, recording the water consumption time of the water purification system in the current water production mode;

comparing the water usage time with the pole reversal time;

when the water using time is less than or equal to the pole reversing time, the water making mode is not switched;

when the water using time is longer than the pole reversing time, switching a water making mode;

wherein the water preparation mode comprises positive water preparation and reverse water preparation.

9. The method of claim 7, wherein the method is used in the water purification system as claimed in claim 2, and the controlling the applied voltages of the water pump, the waterway switching device and the electrodialysis membrane stack according to the determined water production mode comprises:

controlling the third flow valve to be closed, controlling the first flow valve and the second flow valve to be opened, controlling the first electromagnetic valve and the second electromagnetic valve to be opened, controlling the first end and the second end of the four-way valve to be communicated, controlling the third end and the fourth end of the four-way valve to be communicated, controlling the third electromagnetic valve and the fourth electromagnetic valve to be closed, and controlling the water pump to be started; or the like, or, alternatively,

and controlling the second flow valve to be closed, controlling the first flow valve and the third flow valve to be opened, controlling the first electromagnetic valve and the second electromagnetic valve to be opened, controlling the first end of the four-way valve to be communicated with the third end, controlling the second end of the four-way valve to be communicated with the fourth end, controlling the third electromagnetic valve and the fourth electromagnetic valve to be closed, and controlling the water pump to be started.

10. The method of controlling a water purification system of claim 9, further comprising:

acquiring a water outlet TDS, and determining the current applied to the electrodialysis membrane stack and the pump water flow of the water pump according to the water outlet TDS, wherein the water outlet TDS is the total dissolved solid value of the water outlet of the water purification system;

and controlling a power supply of the electrodialysis membrane stack according to the current and the water making mode, controlling the water pump according to the water pumping flow, and controlling the water path switching device to make water.

11. The method of claim 9, wherein the switching the water production mode when the water usage time is greater than the reversal time comprises:

and controlling the first flow valve, the second flow valve, the third flow valve, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the four-way valve to be fully closed, and resetting the water using time.

12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method of controlling a water purification system according to any one of claims 6-11.

13. An electronic device comprising a memory and a processor, the memory having a computer program stored thereon, wherein the computer program, when executed by the processor, implements a method of controlling a water purification system as claimed in any one of claims 6-11.

14. Water purification apparatus comprising a water purification system as claimed in any one of claims 1 to 5, or an electronic apparatus as claimed in claim 13.