CN111924936A - A method for diagnosing salt deficiency in a water softening system - Google Patents

Abstract

The invention discloses a method for diagnosing lack of salt in a water softening system, wherein an automatic softening control valve provided in the water softening system outputs a switch signal to a host computer when starting and stopping the softening and regeneration process. The conductivity meter is installed at the bottom of the concave section of the drainage pipe of the softening system, monitors the drainage and outputs a conductivity signal to the host computer. When the upper computer receives the regeneration start signal output by the automatic softening control valve, it starts to collect and record the conductivity signal output by the conductivity meter, and record these conductivity data through the frequency of every 10 seconds, and then according to the "softening regeneration after starting , whether the cumulative number of ultra-high data of the conductivity signal is greater than or equal to 60, and within 10 minutes before the end of the softening regeneration process, whether the cumulative number of normal data of the conductivity signal is greater than or equal to 30" as a condition, Judge and prompt whether the softening regeneration process is lack of salt. Timely and effective salt-adding reminders can help users reduce usage risks and unnecessary losses.

Description

A method for diagnosing salt deficiency in a water softening system

technical field

The invention belongs to the technical field of water treatment, and in particular relates to solving the problem of timing and reminder of adding salt to a water softening system.

Background technique

At present, sodium-type (Na+) cation resin is used as filter filler, and Ca2+ and Mg2+ in tap water are removed by the principle of ion exchange, so as to remove or reduce the hardness of tap water and reduce the generation of scale. This method has been widely used in the field of water treatment. . Since the cationic resin loses its processing capacity after adsorption saturation, it is necessary to use saturated brine to regenerate it (reverse adsorption process), so that the sites on the resin particles are replaced by Na+ again, so that the resin filter material can be renatured, restored and softened ability. This process of adsorption and regeneration (reverse adsorption) is essential for the device (ie, water softening system, or water softener) to remove water hardness by ion exchange.

Since the filter material of the water softening system needs to be periodically regenerated and consumed NaCl (hereinafter referred to as salt), the water softening system must have a salt-dissolving tank to hold the excess salt and form saturated brine for regular regeneration. When the solid salt in the salt tank is consumed, the softening device will lose its regeneration function, so regular addition is a necessary process.

The traditional water softening system usually uses the following reminders for the process of adding salt:

First, without reminding, users can control by observation and experience - this is the most common method, and this method occupies more than 90% of similar devices.

The second is to remind regularly and add too much each time. However, the existing problems and shortcomings are: this is a relatively extensive management method, and it is usually difficult to accurately grasp the salt addition without specifying the consumption of each regeneration, the amount of salt added each time and the regeneration cycle. the timing, that is, there are too many variables, too many variables, and low reliability.

The third is to use the infrared principle to add a material level sensor in the salt box to sense the change of the material height of the solid salt to remind the salt to be added. However, the existing problems and shortcomings are: because the salt box is a harsh and complex solid/liquid mixed high-salt working environment, this is a big challenge for any sensor. Its life and cost will cause obstacles to its promotion, that is, poor reliability and economy;

Fourth, using the principle of specific gravity change, when the density of the solution in the salt tank is low enough, a regeneration switch signal device is triggered to remind the salt to be added. However, the existing problems and shortcomings are: there is no stirring device in the salt-dissolving tank, and most of the time it is in a mixed state of solid and liquid, and the concentration of the salt solution is not uniform. And the buoyancy change caused by the density change is not significant enough, which leads to the lack of reliability of the method. At the same time, it is also affected by the precision and reliability of the buoyancy transmission mechanism and the height change of the water filling level of the salt tank, which will also bring about the problem of unstable performance.

To sum up, the timing and reminder of adding salt to the water softening system, currently only a few products have similar functions, and the reliability and economy are not ideal, which is also a key to their difficulty in gaining popularity. Positioning the solution in the salt-dissolving tank with a relatively complex and harsh working environment is an important core factor that makes it difficult to solve this problem.

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the prior art, the present invention provides a device and method for diagnosing lack of salt in a water softening system. Solve the problem of salt shortage diagnosis and reminder of water softening system through more reliable, simple and low-cost devices and processes, so as to overcome the problem of water hardness exceeding the standard caused by the lack of salt addition reminder function of traditional water softening devices, or unreliable and untimely; Especially for industrial water treatment systems, since the softening device plays a key role in protecting water treatment devices such as membrane elements, electric desalination, hot water boilers, etc., timely and effective salt-adding reminders can help users reduce usage risks. and unnecessary losses.

To achieve the above object, the present invention adopts the following technical solutions:

A method for diagnosing lack of salt in a water softening system, comprising a device for diagnosing lack of salt in a water softening system, the device for diagnosing lack of salt in a water softening system comprising a host computer, an automatic softening control valve and a conductivity meter connected to the host computer; When the host computer receives the regeneration start signal output by the automatic softening control valve, the host computer starts to collect and record the conductivity signal output by the conductivity meter;

When the cumulative number of ultra-high data of conductivity signals collected and recorded by the host computer is ≥60, and within 10 minutes before the end of the softening regeneration process, the cumulative number of normal data of conductivity signals collected and recorded by the host computer is greater than or equal to 60 At 30, after the softening and regeneration process is over, the host computer that receives the regeneration stop signal output by the automatic softening control valve will indicate the normal signal of the softening and regeneration process;

When the cumulative number of ultra-high data of the conductivity signal collected and recorded by the host computer is less than 60, after the softening and regeneration process is over, the host computer that receives the regeneration stop signal output by the automatic softening control valve will indicate that the dissolved salt tank lacks salt. Warning signal; when the cumulative number of ultra-high data of the conductivity signal collected and recorded by the host computer is ≥60, and within 10 minutes before the end of the softening regeneration process, the accumulation of the normal data of the conductivity signal collected and recorded by the host computer When the number is less than 30, after the softening regeneration process is over, the upper computer that receives the regeneration stop signal output by the automatic softening control valve will prompt a regeneration abnormality warning signal.

In the above-mentioned method for diagnosing salt deficiency in a water softening system, the time interval for the upper computer to collect and record the conductivity signal is 5-15 seconds.

In the above-mentioned method for diagnosing salt deficiency in a water softening system, the ultra-high data of the electrical conductivity signal is electrical conductivity>2000μs/cm; the normal data of the electrical conductivity signal is electrical conductivity<2000μs/cm.

In the above-mentioned method for diagnosing salt deficiency in a water softening system, the softening regeneration process includes backwashing, salt absorption, slow washing, water replenishment and normal washing, wherein the time for salt absorption and slow washing is ≥60min.

The above-mentioned method for diagnosing lack of salt in a water softening system, the automatic softening control valve is connected with a tap water pipe, a drain pipe, a softened water outlet pipe and a dissolved salt tank; the automatic softening control valve is used when starting the softening regeneration process. , output the regeneration start signal to the upper computer; when the softening regeneration process is stopped, output the regeneration stop signal to the upper computer; the conductivity meter is installed on the drain pipe; the drain pipe is formed with a concave section, the The conductivity meter is installed at the bottom of the concave section.

In the above-mentioned method for diagnosing salt deficiency in a water softening system, the conductivity meter and the host computer are combined into one, forming a compact and independent electronic product, which is installed on the drain pipe.

The technical scheme provided by the invention has the following beneficial effects:

First, the online conductivity measurement method is used as the core. The conductivity meter is connected to the drain pipe of the automatic softening control valve, which is easy to install; and it is installed at the bottom of the concave section of the drain pipe to prevent water from being drained, so as to ensure that the measuring part of the conductivity meter is always immersed in water to ensure The conductivity meter has stable working conditions, real-time online measurement and output conductivity signal to the host computer; the conductivity online measurement technology is mature and reliable, the cost of the relevant conductivity meter is low, and the supply is sufficient.

Second, the collection and analysis functions of conductivity signals are added to the host computer software system, and the host computer records and analyzes the change process of the qualitative index of the conductivity of the drainage outlet during the regeneration process to determine whether the salt tank is lacking salt. The span of measurement data is large, and it is only necessary to distinguish between ultra-high and normal. The accuracy of the instrument is not high, and regular calibration is not required.

Third, the conductivity meter can be combined with the host computer to form a compact and independent electronic product, which can be installed on the drain pipe of any existing softening device to achieve related functions, without the need for the existing softening and regeneration device. The transformation of structure and circuit has good compatibility and is conducive to large-scale promotion.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Fig. 1 is the structural representation of the water softening system salt deficiency diagnosis device of the present invention;

Fig. 2 is the installation structure schematic diagram of the conductivity meter of the present invention;

Fig. 3 is a schematic diagram of the change in conductivity of the water outlet during the softening and regeneration process of the water softening system of the present invention;

Fig. 4 is the schematic diagram of the water softening system of the present invention in softening regeneration salt absorption+slow washing process-time vs. electrical conductivity curve;

FIG. 5 is a schematic diagram of the control flow of the host computer of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

In the claims, description and the above drawings of the present invention, unless otherwise clearly defined, the terms "first", "second" or "third" are used to distinguish different objects, rather than used for Describe a specific order.

In the claims, description and the above drawings of the present invention, unless otherwise expressly defined, the terms "center", "horizontal", "longitudinal", "horizontal", "vertical" and "top" are used for directional words. , "bottom", "inside", "outside", "up", "down", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. The positional relationship is based on the orientation and positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation. , so it should not be construed as limiting the specific protection scope of the present invention.

In the claims, description and the above drawings of the present invention, unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" should be used in a broad sense, that is, there is no displacement relationship and relative rotation relationship between the two. Any connection means, that is to say, including non-removable fixed connection, detachable fixed connection, integrated and fixed connection through other devices or elements.

In the claims, description and the above drawings of the present invention, if the terms "including", "having" and their modifications are used, the intention is to "include but not be limited to".

1 to FIG. 4, a water softening system salt-deficiency diagnostic device of the present invention will be described. It includes an upper computer, an automatic softening control valve and a conductivity meter connected to the upper computer.

Referring to Figure 1 and Figure 2, the automatic softening control valve is connected with a tap water pipe, a drain pipe, a softened water outlet pipe and a dissolved salt tank, and the automatic softening control valve is connected to a softening filter. In this embodiment, a model F63B1 or model F63B3 automatic softening control valve is used. The water softening system controls and realizes the water filtration and softening regeneration process through the start and stop of the automatic softening control valve. Please refer to Figure 3. The softening and regeneration process includes starting during backwashing, going through salt absorption, Slow washing, replenishing water, stop after positive washing, and the time of salt absorption plus slow washing (salt absorption + slow washing) in the softening regeneration process of the present invention is ≥60min to ensure that the softened resin is fully regenerated. The automatic softening control valve outputs a regeneration switch signal to the host computer when starting and stopping the softening regeneration process. The regeneration switch signal includes a regeneration start signal and a regeneration stop signal to indicate the start point and end point of the softening regeneration process. Specifically, the automatic softening control valve outputs a regeneration start signal to the host computer when starting the softening regeneration process; the automatic softening control valve outputs a regeneration stop signal to the host computer when stopping the softening regeneration process.

Please refer to FIG. 1 and FIG. 2 , the conductivity meter CT is installed on the drain pipe. In this embodiment, a model CM230 conductivity meter is used. Specifically, the drain pipe is connected to the drain port of the automatic softening control valve and the drain outlet of the floor drain. The drain pipe is formed with a concave section A, which is similar to a U-shaped pipe, and the conductivity meter is installed at the bottom of the concave section A. Bottom, to prevent the water from being drained, to ensure that the conductivity meter CT is always immersed in water to measure online in real time and output conductivity signals to the host computer. The parameters of the conductivity meter CT of the present invention are in the range of 0-2000 μs/cm@25°C.

The national standard for electrical conductivity of municipal tap water is specified as <2000μs/cm@25°C (the conductivity in the following statements is the conductivity when compensated to 25°C), while the conductivity of concentrated brine that can be used to regenerate and soften cation resin is as high as 20000μs /cm or more.

As shown in Figure 4, a successful and complete softening regeneration process must go through a process of changing the conductivity measured from the drain pipe from "super high" to "normal". The "super high" process indicates that the water softening system has successfully absorbed Concentrated brine, the "normal" process means that at the end of the softening regeneration process, the brine in the water softening system has been drained normally and has been successfully replaced by tap water. At the same time, the existence of this "normal" value can also verify from the side that the conductivity meter performs normally and can reflect data changes normally.

When there is a lack of salt in the salt-dissolving tank, the concentration of the inhaled salt solution (that is, the conductivity) will inevitably decrease or be close to that of tap water. The present invention uses this typical process conductivity change to output the conductivity signal in real time through the conductivity meter. Give the host computer to judge whether the salt-dissolving tank of the water softening system lacks salt.

The host computer has the functions of collecting and analyzing the conductivity signal, and in this embodiment, the host computer with the chip model EM78P451 is used. In the present invention, the conductivity meter and the host computer can also be combined into one to form a compact and independent electronic product, which can be installed on the drain pipe of any existing water softening system, so as to realize the recording and analysis through the host computer. The change process of the qualitative index of the conductivity in the drain pipe can be used to judge whether the dissolved salt tank is lack of salt.

Please refer to Fig. 5 to illustrate that the method for diagnosing the lack of salt in the water softening system of the present invention is: when the host computer receives the regeneration start signal output by the automatic softening control valve, it starts to diagnose the state of lack of salt during the softening and regeneration process of the water softening system of the present invention. ; The host computer starts to collect and record the conductivity signal output by the conductivity meter of the present invention; Considering the possible fluctuation of the conductivity signal data, in order to ensure the reliability of judgment, the time interval for the host computer of the present invention to collect and record the conductivity signal is 5- 15 seconds. Preferably, the time interval for the host computer of the present invention to collect and record the conductivity signal is 10 seconds.

During the entire softening and regeneration process, the host computer performs the following salt-deficiency diagnosis after the softening and regeneration process is completed according to the collected and recorded conductivity signals:

First, when the cumulative number of ultra-high data of the conductivity signal collected and recorded by the host computer is ≥ 60, and within 10 minutes before the end of the softening regeneration process, the accumulation of the normal data of the conductivity signal collected and recorded by the host computer When the number is more than 30; after the softening regeneration process is over, the host computer that receives the regeneration stop signal output by the automatic softening control valve will prompt "softening regeneration process terminated", and the softening regeneration process will be regarded as meeting the standard.

Second, when the cumulative number of ultra-high data of the conductivity signal collected and recorded by the host computer is less than 60, after the softening regeneration process is over, the host computer that receives the regeneration stop signal output by the automatic softening control valve will prompt "melting Salt tank lack of salt warning signal", this softening and regeneration process is regarded as substandard.

The third is, when the cumulative number of ultra-high data of the conductivity signal collected and recorded by the host computer is ≥60, and within 10 minutes before the end of the softening regeneration process, the accumulation of the normal data of the conductivity signal collected and recorded by the host computer When the number is less than 30; after the softening regeneration process is over, the host computer that receives the regeneration stop signal output by the automatic softening control valve will prompt "regeneration abnormal warning signal", and the softening regeneration process will be regarded as not up to the standard.

In the present invention, the ultra-high data of the conductivity signal is conductivity>2000μs/cm, and the conductivity meter outputs an invalid value; the normal data of the conductivity signal is conductivity<2000μs/cm, and the conductivity meter outputs specific values. valid value.

The foregoing specification illustrates and describes preferred embodiments of the present invention, and as previously stated, it should be understood that the present invention is not limited to the form disclosed herein, and should not be construed as an exclusion of other embodiments, but may be used in a variety of other Combinations, modifications and environments are possible within the scope of the inventive concepts described herein, from the above teachings or from skill or knowledge in the relevant fields. However, modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all fall within the protection scope of the appended claims of the present invention.

Claims (10)

1. A water softening system salt deficiency diagnosis method is characterized by comprising a water softening system salt deficiency diagnosis device, wherein the water softening system salt deficiency diagnosis device comprises an upper computer, an automatic softening control valve and a conductivity meter which are connected with the upper computer; when the upper computer receives a regeneration starting signal output by the automatic softening control valve, the upper computer starts to acquire and record a conductivity signal output by the conductivity meter;

when the accumulated number of the ultrahigh data of the conductivity signals collected and recorded by the upper computer is more than or equal to 60, and the accumulated number of the normal data of the conductivity signals collected and recorded by the upper computer is more than or equal to 30 within 10 minutes before the softening and regeneration process is finished, after the softening and regeneration process is finished, the upper computer receiving a regeneration stop signal output by the automatic softening control valve prompts a normal signal of the softening and regeneration process;

when the accumulated number of the ultrahigh data of the conductivity signals collected and recorded by the upper computer is less than 60, after the softening and regeneration process is finished, the upper computer receiving the regeneration stop signal output by the automatic softening control valve prompts a salt shortage warning signal of the salt dissolving tank; when the accumulated number of the ultrahigh data of the conductivity signals collected and recorded by the upper computer is more than or equal to 60, and the accumulated number of the normal data of the conductivity signals collected and recorded by the upper computer is less than 30 within 10 minutes before the softening and regenerating process is finished, the upper computer receiving the regeneration stop signal output by the automatic softening control valve prompts a regeneration abnormity warning signal after the softening and regenerating process is finished.

2. The method as claimed in claim 1, wherein the time interval for the upper computer to collect and record the conductivity signal is 5-15 seconds.

3. A method for diagnosing salt deficiency in a water softening system according to claim 1 or 2, wherein the conductivity signal is ultra high with a conductivity >2000 μ s/cm; the normal data for the conductivity signal is conductivity <2000 mus/cm.

4. The method for diagnosing the salt deficiency of the water softening system according to claim 1 or 2, wherein the softening regeneration process comprises backwashing, salt absorption, slow washing, water replenishing and forward washing, and the time of the salt absorption and the slow washing is more than or equal to 60 min.

5. The method for diagnosing the salt deficiency of the water softening system according to claim 1 or 2, wherein the automatic softening control valve is connected with a tap water pipe, a water discharge pipe, a softened water outlet pipe and a salt dissolving tank; when the automatic softening control valve starts a softening regeneration process, a regeneration starting signal is output to an upper computer; when the softening regeneration process is stopped, outputting a regeneration stop signal to an upper computer; the conductivity meter is arranged on the drain pipe; the drain pipe is provided with a concave section, and the conductivity meter is arranged at the bottom of the concave section.

6. The method for diagnosing the salt deficiency of the water softening system according to claim 3, wherein the automatic softening control valve is connected with a tap water pipe, a drain pipe, a softened water outlet pipe and a salt dissolving tank; when the automatic softening control valve starts a softening regeneration process, a regeneration starting signal is output to an upper computer; when the softening regeneration process is stopped, outputting a regeneration stop signal to an upper computer; the conductivity meter is arranged on the drain pipe; the drain pipe is provided with a concave section, and the conductivity meter is arranged at the bottom of the concave section.

7. The method for diagnosing the salt deficiency of the water softening system according to claim 4, wherein the automatic softening control valve is connected with a tap water pipe, a drain pipe, a softened water outlet pipe and a salt dissolving tank; when the automatic softening control valve starts a softening regeneration process, a regeneration starting signal is output to an upper computer; when the softening regeneration process is stopped, outputting a regeneration stop signal to an upper computer; the conductivity meter is arranged on the drain pipe; the drain pipe is provided with a concave section, and the conductivity meter is arranged at the bottom of the concave section.

8. The method as claimed in claim 5, wherein the conductivity meter and the upper computer are integrated into a compact and independent electronic product, and the compact and independent electronic product is installed on the water drainage pipe.

9. The method as claimed in claim 6, wherein the conductivity meter and the upper computer are integrated into a compact and independent electronic product, and the compact and independent electronic product is installed on the water drainage pipe.

10. The method as claimed in claim 7, wherein the conductivity meter and the upper computer are integrated into a compact and independent electronic product, and the compact and independent electronic product is installed on the water drainage pipe.

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