WO2021000779A1 - Prefilter having filter screen self-cleaning function - Google Patents

Abstract

The present invention relates to a prefilter having a filter screen self-cleaning function, comprising a filter head provided with a water inlet and a water outlet, a filter bottle connected to the filter head, and a drainage structure connected to the lower end of the filter bottle. A filter mechanism is provided in the filter bottle; the filter mechanism comprises a water diversion cover, a filter screen skeleton, a central water inlet pipe, and a filter screen; a mounting cavity is formed in the top of the filter head, and a driving mechanism is fixedly provided in the mounting cavity; the driving mechanism comprises a driving control assembly and a driving shaft; the driving shaft extends axially into the filter mechanism and is fixed to the filter mechanism; a power output end of the driving control assembly is in variable clutch linkage with the driving shaft. When the power output end of the driving control assembly is not in linkage with the driving shaft, a drainage path of the drainage structure is closed, and when the power output end of the driving control assembly is in linkage with the driving shaft, the drainage path of the drainage structure is opened; when the linkage is maintained, the filter mechanism can rotate under the driving of the driving control assembly to realize self-cleaning decontamination of the filter screen by centrifugal force.

Description

Pre-filter with filter screen self-cleaning function Technical field

The invention relates to a pre-filter with a filter screen self-cleaning function, belonging to the technical field of water purification equipment.

Background technique

The pre-filter in the prior art includes: a head provided with water inlet and outlet ports, a filter bottle connected with the head, a drainage structure connected with the lower end of the filter bottle, and a filter mechanism is provided in the filter bottle. During use, water flows from the water inlet port into the gap between the filter bottle and the filter mechanism, filtered by the filter mechanism, and flows into the center of the filter mechanism, and then flows from the center of the filter mechanism to the water outlet port.

Existing pre-filters, the filter mechanism will be blocked after long-term use, and need to be replaced or cleaned. Most of the existing pre-filters are cleaned by manually rotating the filtering mechanism to achieve in-situ scraping or cleaning, or by motor Drive the filter mechanism to rotate to achieve in-situ scraping or cleaning.

The existing pre-filter filter screen cleaning is mainly realized by the principle of siphon cleaning and backwashing. The new method of dewashing using centrifugal force in the present invention aims to solve the high cost, relatively complicated structure, and low cleaning efficiency in the above-mentioned principle solutions. , Laborious operation and other technical deficiencies, creatively provide a pre-filter with filter self-cleaning function.

Summary of the invention

One of the objectives of the present invention is to solve the shortcomings of the prior art and provide a pre-filter with a filter screen self-cleaning function.

The technical solutions adopted by the present invention to solve its technical problems are:

Pre-filter with filter screen self-cleaning function, including a machine head with inlet and outlet ports, a filter bottle connected with the machine head, and a drainage structure connected with the lower end of the filter bottle. The filter bottle is equipped with a filter mechanism and a filter mechanism. Including water divider, filter frame, central water inlet pipe and filter,

An assembly cavity is provided on the top of the handpiece, and a driving mechanism is fixed in the assembly cavity;

The drive mechanism includes a drive control assembly and a drive shaft. The drive shaft extends axially into the filter mechanism and is fixed to the filter mechanism. The power output end of the drive control assembly is in variable clutch linkage with the drive shaft. When the power output end of the drive shaft is disconnected from the drive shaft, the drainage structure of the drainage structure is closed. When the power output end of the drive control assembly maintains linkage with the drive shaft, the drainage structure of the drainage structure opens. When the linkage is maintained, the filter mechanism can be driven Driven by the control assembly, it rotates through centrifugal force to realize self-cleaning and decontamination of the filter.

Definition: Variable clutch linkage, the linkage state can be freely (manually or electrically) disconnected or re-maintained as required under the action of external force. When the linkage is disconnected, the pre-filter is in the normal filtering state; when the linkage is maintained, the pre-filter is in the self-cleaning and decontamination state. The switching of the linkage mode does not change the structure of the pre-filter.

Preferably, the present invention provides a manual mode, and the drive control component includes:

The impeller is arranged in the assembly cavity, and the fins of the impeller correspond to the water inlet port of the nose, and receive the power of the water flow at the water inlet port;

Manual adjustment mechanism, including adjustment knob, seal and adjustment knob assembly seat, the drive shaft passes through the adjustment knob assembly seat and is sealed by the seal, the adjustment knob is fixed to the end of the drive shaft, the adjustment knob assembly seat is fixed with the head, the adjustment knob Relying on the adjusting knob assembly seat, it can at least move up and down axially. After moving up for a certain stroke, the impeller and the drive shaft maintain linkage, and after moving down for a certain stroke, the impeller and the drive shaft are disconnected from linkage;

The axial stroke value of the adjusting knob relative to the adjusting knob assembly seat is adapted to the stroke value of the linkage and unlinking of the impeller and the drive shaft.

Preferably, the present invention provides a manual-automatic integration mode, and the drive control component includes:

The impeller is arranged in the assembly cavity, and the fins of the impeller correspond to the water inlet port of the nose, and receive the power of the water flow at the water inlet port;

Hand-automatic integrated adjustment mechanism, including adjustment knob, seal, transmission buckle, drive motor, motor bracket and adjustment knob assembly seat, the drive shaft passes through the adjustment knob assembly seat and is sealed by the seal, and the adjustment knob is fixed to the end of the drive shaft , The adjusting knob assembly base is fixed with the machine head;

The motor bracket is fixed on the top of the adjusting knob assembly seat, and the end of the drive motor is vertically fixed with a screw rod. The screw rod is screwed with the transmission buckle. After passing through the motor bracket, the transmission buckle and the adjustment knob can be detached and fixed.

The adjustment knob can rely on the adjustment knob assembly seat, and can at least move up and down axially. After moving up for a certain stroke, the impeller and the drive shaft maintain linkage, and after a certain stroke down, the impeller and the drive shaft are disconnected from the linkage;

The length of the screw rod is compatible with the stroke value required for the linkage or release of the drive shaft and the impeller, and the stroke value of the adjustment knob relative to the upper and lower axial actions of the adjustment knob assembly seat.

The drive control component relies on the impeller and adds a drive motor to drive the drive shaft up, down and circular motion functions, so that it can be realized under the control of an external electronic control component (for specific applications, matching according to the application scenario) Manual, automated or semi-automated operation, regular cleaning and drainage.

In this solution, the drive shaft end of the drive motor is a threaded screw rod, and its length is consistent with the stroke value of the drive shaft. The inner hole of the drive buckle is a threaded hole, and it is assembled and fixed by a clamping method with the adjusting knob. The component controls the drive motor to rotate, and when the transmission buckle moves up, because the adjusting knob is restricted by the adjusting knob assembly seat, it can only move upward along the axial direction. When the stroke is completed, the screw has reached its limit, and the adjusting knob is no longer Restricted by the adjusting knob assembly seat, it starts to perform circular movement under the action of the drive motor to discharge sewage centrifugal; when the sewage is discharged, the drive motor reverses and the axis goes down. After the stroke is completed, the movement stops.

Preferably, the drive control component includes:

The impeller is arranged in the assembly cavity, and the fins of the impeller correspond to the water inlet port of the nose, and receive the power of the water flow at the water inlet port;

The electric adjustment mechanism includes a drive motor, a worm gear structure, a seal and an adjustment mechanism assembly seat. Any one of the turbine and worm is connected to the output shaft of the drive motor, the other is fixed to the end of the drive shaft, and the drive shaft is assembled through the adjustment mechanism The seat is sealed by a seal. The adjusting mechanism assembly seat is fixed with the machine head. The drive motor drives the turbine or worm to drive the upper and lower axial movements of the drive shaft. After a certain stroke of upward movement, the impeller and drive shaft maintain linkage, and the downward movement is constant. After the stroke, the impeller is disconnected from the drive shaft;

The axial stroke value that can be realized by the worm gear structure is compatible with the stroke value required for the linkage of the drive shaft and the impeller or for releasing the linkage.

Preferably, the drive control component includes:

The impeller is arranged in the assembly cavity, and the fins of the impeller correspond to the water inlet port of the nose, and receive the power of the water flow at the water inlet port;

The pneumatic adjustment mechanism includes a telescopic cylinder, a seal and an assembly seat of the adjustment mechanism. The drive shaft passes through the assembly seat of the adjustment mechanism and is sealed by the seal. The telescopic cylinder is arranged vertically. The piston rod of the telescopic cylinder is fixed with the end of the drive shaft. The adjustment mechanism The assembly base is fixed with the machine head. The telescopic cylinder drives the drive shaft to move up and down axially. After a certain stroke of upward movement, the impeller and drive shaft maintain linkage. After a certain stroke of downward movement, the impeller and drive shaft are disconnected from the linkage and the cylinder is extended. The stroke value of the drive shaft is compatible with the stroke value required for linkage or unlinking of the drive shaft and the impeller.

Preferably, the drive shaft is also provided with a rotation resistance reduction structure to ensure that after the impeller and the drive shaft remain linked, it can move freely under the condition of the impeller transmitting the power of the water flow and overcome the loss of water flow force to the greatest extent.

More preferably, the rotation resistance reduction structure is realized in the following manner: the drive shaft is arranged in at least two sections, the first section is the adjustment section, the other section is the drive section, the top of the drive section is provided with a cavity, and the drive section is also provided with an impeller The first linkage part that is linked and the second linkage part that is linked to the central water inlet pipe;

The adjusting section and the driving section are sleeved and capable of relative rotation, and at the same time can drive the driving section and the central water inlet pipe to move axially;

The tail end of the driving section extends into the sewage structure after passing through the central water inlet pipe, and is connected to the sewage structure in a rotary sealing manner.

Further preferably, the drive shaft is arranged in at least three sections, the first section is the adjustment section, the second section is the drive section, and the third section is the guide fixing section. The drive section is provided with a cavity at least at the top, the first linkage section and the second linkage section. Located at both ends of the driving section;

The adjusting section and the driving section are sleeved and capable of relative rotation. The bottom end of the adjusting section extends and the driving section is axially limited with the central water inlet pipe through a limiter. The adjusting section can drive the driving section and the central water inlet pipe to move axially as a whole ；

A section of the guide fixed section is sleeved on the central water inlet pipe, and is axially limited by the limiter, which can move axially with the central water inlet pipe. The central water inlet pipe and the guide fixed section can rotate synchronously or asynchronously, and the other end extends to the sewage discharge Inside the structure, and sealed connection with the sewage structure.

Preferably, the assembling cavity of the pre-filter is also provided with a cut-off cover, the side of the cut-off cover is provided with water through holes, the cut-off cover is sleeved with the regulating section and covered outside the impeller, the cut-off cover and the regulating section are linked, the impeller and After the driving section is linked, the impeller and the interception cover can independently rotate to a certain angle. Preferably, a limit part for limiting the rotation angle of the interception cover is provided in the assembly cavity, and the maximum rotation angle of the interception cover is 90°.

Add a cut-off cover on the basis of the original impeller. After the drive shaft completes the upward stroke, the cut-off cover can be driven to make a circular motion at a certain angle through the transmission of the adjusting knob; at this time, the water hole on the cut-off cover will meet the water inlet port of the machine head. The cross section of the water flow entering the impeller is changed due to mutual interleaving; under this design, when the water inlet pressure is constant, the water inlet section becomes smaller, and the water flow pressure of the water inlet impeller will be doubled, thereby increasing the force of the impeller. Increase the speed; otherwise, reduce the speed, that is, through the size of the through hole, you can adjust the force of the impeller, and then adjust the speed.

This solution also includes a solution that uses an electric adjustment mechanism as the drive control method. The drive shaft end of the drive motor is a threaded screw rod whose length is consistent with the stroke value of the drive shaft. The inner hole of the transmission buckle is a threaded hole, and Assemble and fix with the adjusting knob through a snap connection. When the electronic control component controls the drive motor to rotate and the transmission buckle moves upward, the adjusting knob can only move upward along the axial direction due to the limitation of the adjusting knob assembly seat. The rod has also reached its limit. At this time, the adjustment knob is no longer restricted by the adjustment knob assembly seat. It starts to make a circular motion under the action of the driving motor, and controls the interceptor to change the water flow cross section, thereby realizing the function of adjusting the water inlet pressure. ; When the sewage is discharged, the drive motor reverses, and the circular motion of the shutoff cover reaches the limit part, the screw rod is released from the tightening state, and the axis goes down. After the stroke is completed, the movement is stopped.

Preferably, at least one assembling groove is provided in the axial direction of the impeller center, and at least one matching assembling bar is provided at the opposite part of the drive shaft. The linkage is realized through the cooperation of the assembling groove and the assembling bar by external force. Uncooperate to realize disconnection linkage.

Preferably, the manual adjustment mechanism further includes a first limiting member and a second limiting member, the drive shaft includes a first limiting slot and a second limiting slot, the adjustment knob is sleeved with the drive shaft, and both ends pass through the first limiting slot. A limit piece, the first limit slot, the second limit piece, and the second limit slot are coordinated and fixed. Both the first limit piece and the second limit piece include a circlip, a steel wire clamp and a mold pressure. Type or car out of a limited structure such as a boss.

Preferably, the adjusting knob assembly seat is screwed with the machine head, and at least one sliding groove is provided in the axial direction, and at least one sliding block is correspondingly provided with the adjusting knob. Through the cooperation of the sliding groove and the sliding block, under the action of external force, After sliding up and down in the axial direction, after sliding to a certain stroke, the impeller and the drive shaft maintain linkage, the adjustment knob can also rotate a certain angle in the circle.

Preferably, the manual-automatic integrated adjustment mechanism further includes a first limiting member and a second limiting member, the drive shaft includes a first limiting slot and a second limiting slot, the adjustment knob is sleeved with the drive shaft, and the two ends are respectively The first limiting member, the first limiting slot, the second limiting member, and the second limiting slot are coordinated and fixed. Both the first limiting member and the second limiting member include a circlip, a steel wire clamp, and Limiting structure such as mould pressing or turning out boss.

Preferably, the water inlet of the water inlet port enters along the tangential direction to obtain the maximum contact area with the impeller and obtain the maximum driving force of the impeller. The water outlet of the assembly cavity is eccentrically arranged and close to the edge of the impeller.

Preferably, the sewage structure includes a sewage nozzle and a sewage piston. The sewage nozzle is rotatably connected to the sewage port at the bottom of the filter bottle. The bottom end of the sewage piston and the bottom end of the drive shaft are axially fixed. When the drive shaft moves downward, the linkage is released. The sewage piston and the sewage outlet abut the closed sewage channel, and when the drive shaft is kept in linkage upward, the sewage piston and the sewage outlet are released from abutment, and the sewage channel is opened.

Preferably, the central water inlet pipe is completely closed in the circumferential direction, is sleeved with the drive shaft and has a fixed radial relative position, the filter frame is sleeved outside the central water inlet pipe and has a fixed radial relative position, and the cavity between the filter frame and the central water inlet pipe A first raw water channel is formed, the filter screen is sleeved and fixed on the outside of the filter screen frame, the cavity between the filter bottle and the filter screen forms a second raw water channel, and the first and second raw water channels are connected at least when the drainage water channel of the sewage structure is closed;

The top of the filter frame is sleeved in the assembly cavity of the water diversion cover and the contact surface between the two can be sealed. The upper part of the water diversion cover assembly cavity has a larger diameter than the lower part, and the water diversion cover and the drive shaft are sealed by a seal , The water diversion cover is provided with a raw water inlet and a purified water outlet, and a number of seals are arranged between the water diversion cover and the filter bottle to isolate the raw water inlet and the purified water outlet;

When the sewage line is closed and the filter mechanism is normally filtered, the water diversion cover is sealed with the filter frame and the raw water and purified water do not flow; when the sewage line is opened, the water diversion cover and the filter frame are unsealed, and the water diversion cover assembly cavity and filter The top of the net frame cooperates with each other to realize that the raw water and purified water do not flow.

Preferably, the filter mechanism further includes a filter bottle scraper, which is sleeved on the outside of the filter screen and can rotate synchronously with the filter mechanism, and the filter bottle scraper at least partially abuts against the inner wall of the filter bottle.

Preferably, the filter bottle scraper includes a frame and a plurality of scraping wings fixed on the outside of the frame, and the scraping wings abut against the inner wall of the filter bottle.

Preferably, the scraping fins are spirally arranged outside the skeleton, including a left spiral shape and a right spiral shape.

Preferably, the sewage structure includes a sewage nozzle and a sewage piston, the sewage nozzle is rotatably connected to the sewage port at the bottom of the filter bottle, the sewage piston is fixed in the sewage nozzle, and the top of the sewage piston is provided with a seal with a diameter larger than other parts, The gap between the sewage piston and the sewage nozzle constitutes the sewage channel;

The filter mechanism further includes a filter bottle scraper, sleeved on the outside of the filter screen and capable of rotating synchronously with the filter mechanism, the filter bottle scraper at least partially abuts against the inner wall of the filter bottle;

The filter bottle scraper includes a frame and a plurality of scraping wings fixed on the outside of the frame, and the scraping wings abut against the inner wall of the filter bottle;

The frame can move up and down synchronously with the filter mechanism. When moving down, the bottom end of the frame abuts against the sealing part of the sewage piston, the drainage structure is closed, and the water flows from the outlet of the central water inlet pipe into the cavity between the filter mechanism and the filter bottle, and passes through the filter. , Flows out through the purified water outlet; when moving upward, the bottom end of the skeleton is separated from the sewage piston, the drainage structure is closed, and the water flows into the sewage channel from the outlet of the central water inlet pipe and then flows out.

Preferably, the scraping fins are spirally arranged outside the skeleton, including a left spiral shape and a right spiral shape.

The invention utilizes hydraulic power to push the impeller to rotate at a high speed to generate centrifugal force to remove stains on the filter screen, and in the preferred scheme, the filter bottle can be scraped and the filter water purifier can be completed on the top and the bottom of the sewage channel can be opened and closed.

The impeller and filter mechanism are designed for variable clutch linkage. When the sewage line is closed, the impeller and filter mechanism are disconnected; when the sewage line is opened, the linkage is maintained; the linkage mode switching process does not need to adjust the structure of the pre-filter.

The dirt attached to the filter screen of the filter mechanism is separated from the filter screen under the action of centrifugal force; the filtered water in the filter frame will also assist the backwashing of the filter screen under the action of centrifugal force; the water inlet of the machine head enters the impeller cavity at a certain angle Body, and matched with the angle of the impeller to ensure the maximum impact force; and the water outlet of the assembly cavity is eccentric and close to the edge of the impeller, which can ensure that the impeller produces the best speed. Greatly reduce the slow or unable to rotate;

The entire filter mechanism and the sewage mechanism also adopt an integrated conversion design. When the drive shaft is down and the sewage path is closed, the water path is as shown in Figure 1, and the filter works normally, and the impeller and the filter mechanism are disconnected from the linkage; when the drive shaft drives When the filter mechanism goes up, the sewage path is opened, the central water inlet pipe channel is directly connected with the sewage path, the inlet water directly drains the sewage out, and the water supply is stopped in the filter bottle, so that no water flow produces huge resistance to the rotation of the filter mechanism. At this time, the impeller and the filter mechanism are linked , All the water flow pressure is used to push the impeller. Under the simultaneous action of the aforementioned two conditions, the filter mechanism rotates at a high speed to ensure that it can fully utilize the filter screen to decontaminate;

The filter mechanism is equipped with a filter bottle scraper. When the filter bottle is scraped, it can assist in draining sewage and remove residual water in the filter bottle, and will not cause wind resistance that affects the filter mechanism to maintain high speed;

The parts of the entire filter mechanism except for the water diversion cover and the water diversion cover adopt a variable on-off design: when the drive shaft goes down, the filter mechanism is disconnected from the impeller, and the part of the filter mechanism except the water diversion cover is kept sealed with the water diversion cover Status: When the drive shaft moves up, the filter mechanism and the impeller resume linkage. In order to ensure the minimum resistance, the part of the filter mechanism except the water diversion cover must be separated from the sealing state, and the inlet of the central water inlet pipe and the water diversion cover The lower end of the water inlet adopts an anti-wrap design, which can ensure that the other parts of the filter assembly are separated from the water diversion cover, and because the water channel flows out directly through the sewage channel, it will no longer pass through the filter bottle to ensure that the raw water will not enter the net. Waterway

The drive shaft is also equipped with a rotation resistance reduction structure to ensure that after the impeller and the drive shaft remain linked, they can move freely under the power of the impeller and overcome the loss of water flow to the greatest extent. As a resistance reduction structure, the most Excellent realization method: The drive shaft adopts a three-stage split design: that is, the adjustment section, the drive section and the guide fixed section are separated. The drive section is provided with a cavity at least at the top. Because it rotates around the adjustment section, the power of the impeller is transmitted to Filter mechanism, so the adjustment section will not follow the rotation of the filter mechanism. While friction loss is greatly reduced, it also eliminates the influence of the drive control assembly on the speed due to the damping of the seal;

The lower guide fixed section extends into the sewage structure, which improves the stability of the filter mechanism during rotation and avoids eccentricity or jitter. In addition, the segmented design of the drive shaft reduces the length of the respective parts, greatly reduces the processing risk, and reduces Processing difficulty.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Figure 1 is an exploded view of the present invention;

Figure 2 is a perspective view of the present invention in a filtering state;

Figure 3 is a cross-sectional view of Figure 2;

Figure 4 is a perspective view of the present invention in a cleaning state

Figure 5 is a cross-sectional view of Figure 4

Figure 6 is a cross-sectional view of the handpiece of the present invention;

Figure 7 is a partial exploded view of the present invention in manual adjustment mode;

FIG. 8 is a partial perspective view of the present invention in the filtering state of the manual adjustment mode;

Figure 9 is a cross-sectional view of this Figure 8;

Figure 10 is a partial perspective view of the present invention in the manual adjustment mode cleaning state;

Figure 11 is a cross-sectional view of Figure 10;

Figure 12 is a partial exploded view of the present invention in the electric adjustment mode;

Figure 13 is a partial perspective view of the present invention in a filtering state in an electric adjustment mode;

Figure 14 is a cross-sectional view of Figure 13;

Figure 15 is a partial perspective view of the present invention in the electric adjustment mode cleaning state;

Figure 16 is a cross-sectional view of Figure 15;

In the figure: 1. The first limit piece, 2. The adjustment knob, 3. The second limit piece, 4. The adjustment knob assembly seat, 5. The seal, 6, the impeller, 7, the head, 8. The water diversion cover , 9, filter frame, 10, filter, 11, adjustment section, 12, drive section, 13, guide fixed section, 14, central water inlet pipe, 15, scraping fins, 16, skeleton, 17, filter bottle, 18. Sewage piston, 19, sewage nozzle, 21, transmission buckle, 22, drive motor, 23, motor support, 24, screw rod, 25, interception cover, 25a, water hole.

Detailed ways

Example 1:

As shown in Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5, the pre-filter with filter screen self-cleaning function includes a head 7 with water inlet and outlet ports, and a filter bottle connected to the head 7 17 and a drainage structure connected to the lower end of the filter bottle 17, a filter mechanism is provided in the filter bottle 17, and the filter mechanism includes a water divider 20, a filter frame 21, a central water inlet pipe 14 and a filter screen 23,

An assembly cavity is provided on the top of the handpiece 7, and a driving mechanism is fixed in the assembly cavity;

The drive mechanism includes a drive control assembly and a drive shaft. The drive shaft extends axially into the filter mechanism and is fixed to the filter mechanism. The power output end of the drive control assembly is in variable clutch linkage with the drive shaft. When the power output end of the drive shaft is disconnected from the drive shaft, the drainage structure of the drainage structure is closed. When the power output end of the drive control assembly maintains linkage with the drive shaft, the drainage structure of the drainage structure opens. When the linkage is maintained, the filter mechanism can be driven Driven by the control assembly, it rotates through centrifugal force to realize self-cleaning and decontamination of the filter.

In the present invention, the variable clutch linkage, the linkage state can be freely (manually or electrically) disconnected or re-maintained as needed under the action of external force. When the linkage is disconnected, the pre-filter is in the normal filtering state; when the linkage is maintained, the pre-filter is in the self-cleaning and decontamination state. The switching of the linkage mode does not change the structure of the pre-filter.

As shown in Figures 7-11, first of all, the present invention provides a solution for realizing linkage and unlinking in manual mode, and the drive control component includes:

The impeller 6 is arranged in the assembly cavity, and the fins of the impeller 6 correspond to the water inlet port of the machine head 7 and receive the power of the water flow at the water inlet port;

The manual adjustment mechanism includes the adjustment knob 2, the seal 5 and the adjustment knob assembly seat 4. The drive shaft passes through the adjustment knob assembly seat 4 and is sealed by the seal 5, the adjustment knob 2 is fixed to the end of the drive shaft, and the adjustment knob assembly seat 4 Fixed with the machine head 7, the adjusting knob 2 depends on the adjusting knob assembly seat 4, which can at least move up and down in the axial direction, and after a certain stroke upward (the lowest value is the stroke value at which the impeller and the drive shaft fully maintain effective linkage), The impeller and the drive shaft maintain linkage, and after a certain stroke is moved downwards (the lowest value is the stroke value at which the impeller and the drive shaft completely release the effective linkage), the impeller and the drive shaft are disconnected from the linkage;

The axial stroke value of the adjusting knob 2 relative to the adjusting knob assembly seat 4 is adapted to the stroke value of the linkage and unlinking of the impeller 6 and the drive shaft.

As shown in Figures 12-16, in addition, the present invention provides a realization scheme for linkage and release of the manual-automatic integration mode, and the drive control component includes:

The impeller 6 is arranged in the assembly cavity, and the fins of the impeller 6 correspond to the water inlet port of the nose, and receive the power of the water flow of the water inlet port;

The manual-automatic integrated adjustment mechanism includes the adjustment knob 2, the seal 5, the transmission buckle 23, the drive motor 22, the motor bracket 23 and the adjustment knob assembly seat 4. The drive shaft passes through the adjustment knob assembly seat 4 and is sealed by the seal 5, The adjustment knob 2 is fixed to the end of the drive shaft, and the adjustment knob assembly seat 4 is fixed to the machine head 7. The fixing method is mostly screw connection, the easiest fixing method to achieve;

The motor bracket 23 is fixed on the top of the adjusting knob assembly seat 4, and the end of the driving motor 22 is vertically fixed with a screw rod 24. The screw rod 24 is screwed with the transmission buckle 23. After passing through the motor bracket 23, the transmission buckle 23 is connected with The adjusting knob 2 can be detached and fixed, specifically, it can be connected by a snap connection;

The adjustment knob 2 can rely on the adjustment knob assembly seat 4, and can at least move up and down in the axial direction. After a certain stroke of upward movement (the lowest value is the stroke value at which the impeller 6 and the drive shaft fully maintain effective linkage), the impeller 6 and the drive The shaft maintains linkage, and after moving down for a certain stroke (the lowest value is the stroke value at which the impeller 6 and the drive shaft completely release the effective linkage), the impeller 6 is disconnected from the drive shaft;

The length of the screw rod 24 is compatible with the stroke value required for the linkage or release of the drive shaft and the impeller 6, and the stroke value of the adjustment knob 2 relative to the upper and lower axial actions of the adjustment knob assembly 4, which can be It is guaranteed not to be restricted by the adjustment rotating assembly seat 4 to make a circular rotation.

In this implementation scheme, the drive control component relies on the impeller 6 and adds a drive motor 22 to drive the drive shaft to move up and down and circular motion functions, so that the external electronic control component (for specific applications, according to the application scenario for matching Under the control of ), manual, automatic or semi-automatic operation can be realized, and regular cleaning and sewage discharge can be realized.

In this solution, the drive shaft end of the drive motor 22 is a threaded screw rod 24, the length of which is consistent with the stroke value of the drive shaft, the inner hole of the drive buckle 23 is a threaded hole, and it is assembled and fixed with the adjusting knob 2 by a clamping method When the electric control component controls the drive motor 22 to rotate and the transmission buckle 23 moves up, because the adjusting knob 2 is restricted by the adjusting knob assembly seat 4, it can only move up along the axial direction. When the stroke is completed, the screw rod 24 has also reached At this time, the adjusting knob 2 is no longer restricted by the adjusting knob assembly seat 4, and it starts to make a circular motion under the action of the driving motor 22, and the sewage is discharged centrifugal; when the sewage is discharged, the driving motor 22 reverses and the axial direction goes down, complete After the stroke, stop the movement.

Specifically in the present invention, the drive shaft is also provided with a rotation resistance reduction structure to ensure that after the impeller 6 and the drive shaft remain linked, it can move freely under the condition that the impeller 6 transmits the power of the water flow and overcomes the loss of the water flow force to the greatest extent. .

More specifically, the rotation resistance reduction structure is realized in the following way: the drive shaft is arranged in at least two sections, the first section is the adjustment section 11, the other section is the drive section 12, and the drive section 12 is provided with a cavity at least on the top. 12 is also provided with a first linkage part 12a linked with the impeller 6 and a second linkage part 12b linked with the central water inlet pipe 14;

The adjusting section 11 and the driving section 12 are sleeved and capable of relative rotation, and can drive the driving section 12 and the central water inlet pipe 14 to move axially as a whole;

The tail end of the driving section 12 passes through the central water inlet pipe 14 and then extends into the sewage structure, and is connected to the sewage structure in a rotationally sealed manner.

Further preferably, the drive shaft of the present invention is arranged in three sections, the first section is the adjustment section 11, the second section is the drive section 12, and the third section is the guide fixing section 13, and the drive section 12 is provided with a cavity at least at the top. One linkage portion 12a and two linkage portions 12b are provided at both ends of the driving section 12;

The adjusting section 11 and the driving section 12 are sleeved and capable of relative rotation. The bottom end of the adjusting section 11 extends out of the driving section 12 and is axially restricted with the central water inlet pipe 14 through a limiting member. The adjusting section 11 can drive the driving section 12 and The central water inlet pipe 14 moves axially as a whole;

A section of the guiding fixed section 13 is sleeved on the central water inlet pipe 14. It is axially limited by the limiter and can move axially with the central water inlet pipe 14, and the central water inlet pipe 14 and the guiding fixed section 13 can rotate synchronously or asynchronously. The other end extends into the sewage structure and is hermetically connected with the sewage structure.

As shown in Fig. 4, the assembling cavity of the pre-filter is also provided with a cut-off cover 25. The side of the cut-off cover 25 is provided with a water passage 25a. The cut-off cover 25 is sleeved with the regulating section 11 and covered outside the impeller 6. The interception cover 25 is linked with the regulating section 11. After the impeller 6 and the driving section 12 are linked, the impeller 6 and the interception cover 25 can rotate independently. Preferably, there is also a limit part to limit the rotation angle of the interception cover in the assembly cavity. The maximum rotation angle of the cover is 90°.

On the basis of the original impeller 6, a cut-off cover 25 is added. After the drive shaft completes the upward stroke, the cut-off cover 25 can be driven to make a circular motion through the transmission of the adjusting knob 2. At this time, the water-passing hole 25a on the cut-off cover 25 is connected to the head 7 The water inlet ports will change the cross section of the water flow entering the impeller 6 due to mutual staggering; under this design, when the water inlet pressure is constant, the water inlet section becomes smaller, and the water flow pressure of the water inlet impeller 6 will be doubled, thus Increasing the force of the impeller 6 increases the speed; otherwise, reducing the speed, that is, through the size of the water hole 25a, the force of the impeller 6 can be adjusted to adjust the speed.

In the present invention, the impeller 6 is provided with at least one assembling groove in the axial direction, and at least one matching assembling bar is provided at the opposite part of the drive shaft. By means of external force, the linkage is realized through the cooperation of the assembling groove and the assembling bar, and the assembling groove and The disengagement of the assembly bar realizes the disconnection linkage.

Specifically to the present invention, the manual adjustment mechanism further includes a first limiting member 1 and a second limiting member 3. The drive shaft includes a first limiting slot and a second limiting slot, and the adjusting knob 2 is sleeved with the drive shaft, The two ends are respectively restricted and fixed by the first limiting member 1, the first limiting slot and the second limiting member 3, and the second limiting slot. Both the first limiting member 1 and the second limiting member 3 include Circlips, steel wire clamps, and limit structures such as mold pressing or turning bosses are commonly used circlips.

Specifically, in the present invention, the adjusting knob assembly seat 4 is screwed to the machine head 7, and at least one sliding groove is provided in the axial direction, and the adjusting knob is correspondingly provided with at least one sliding block, and the sliding groove is matched with the sliding block. , Under the action of external force, it can slide up and down in the axial direction, and slide to a certain stroke. After the impeller 6 is linked with the drive shaft, the adjustment knob 2 can also rotate to a certain angle in a circle. The manual-automatic integrated adjustment mechanism also includes a first stopper 1 And the second limiting member 3, the drive shaft includes a first limiting slot and a second limiting slot, the adjusting knob 2 is sleeved with the driving shaft, and both ends pass through the first limiting member 1, the first limiting slot and the second limiting slot respectively. The second limiter 3 and the second limiter groove are coordinated and fixed. The first limiter 1 and the second limiter 3 both include a circlip, a steel wire clamp, and a type of limiter such as a mold pressing or a car out boss Bit structure.

As shown in FIG. 6, the inlet water of the inlet port enters along the tangential direction to obtain the maximum contact area with the impeller 6 and obtain the maximum driving force of the impeller 6. The water outlet of the assembly cavity is set eccentrically and close to the edge of the impeller 6.

In the present invention, the sewage structure includes a sewage nozzle 19 and a sewage piston 18. The sewage nozzle 19 is rotatably connected to the sewage port at the bottom of the filter bottle 17, and the bottom end of the sewage piston 18 is axially fixed with the bottom end of the drive shaft to drive When the shaft moves downward to release the linkage, the sewage piston 18 and the sewage outlet abut the closed sewage channel, and when the drive shaft maintains linkage upward, the sewage piston 18 releases the contact with the sewage outlet, and the sewage channel opens.

In the present invention, to be more specific, the central water inlet pipe 14 is completely closed in the circumferential direction, is sleeved with the drive shaft and has a fixed radial relative position. The filter frame 9 is sleeved outside the central water inlet pipe 14 and has a fixed radial relative position. The cavity between 9 and the central water inlet pipe 14 constitutes a first raw water channel, the filter screen 10 is sleeved and fixed on the outside of the filter frame 9, and the cavity between the filter bottle 17 and the filter screen 10 constitutes a second raw water channel. , The two raw water channels are connected at least when the drainage water channels of the sewage structure are closed;

The top end of the filter frame 9 is sleeved in the assembly cavity of the water diversion cover 8 and the contact surface between the two can be sealed. The diameter of the upper part of the assembly cavity of the water diversion cover 8 is larger than that of the lower part, and the water diversion cover 8 and the drive shaft Sealed by seals, the water diversion cover 8 is provided with a raw water inlet and a purified water outlet, and a number of seals are arranged between the water diversion cover 8 and the filter bottle 17 to isolate the raw water inlet and the purified water outlet;

When the sewage line is closed and the filter mechanism is normally filtered, the water diversion cover 8 is sealed with the filter frame 9 and the raw water and purified water do not flow; when the sewage line is opened, the water diversion cover 8 and the filter frame 9 are unsealed, and the water diversion cover 8 The assembly cavity and the top of the filter frame 9 cooperate with each other to prevent the raw water and purified water from flowing.

In order to realize the scraping and washing of the filter bottle synchronously, the filter mechanism further includes a filter bottle scraping member, which is sleeved on the outside of the filter screen 10 and can rotate synchronously with the filter mechanism. The filter bottle scraping member is at least partially connected to the filter bottle 17 The inner wall of the filter bottle abuts, the filter bottle scraper includes a frame 16 and a number of scraping fins 15 fixed on the outside of the frame 16, the scraping fins 15 abut against the inner wall of the filter bottle 17, the scraping fins 15 The outside of the skeleton 16 is spirally arranged, including a left spiral shape and a right spiral shape.

In the present invention, there is another realization of the sewage structure, which is described as follows: the sewage structure includes a sewage nozzle 19 and a sewage piston 18. The sewage nozzle 19 is rotatably connected to the sewage outlet at the bottom of the filter bottle 17, and the sewage piston 18 is fixed to the sewage In the sewage spout 19, the top of the sewage piston 18 is provided with a sealing part 18a whose diameter is larger than other parts, and the gap between the sewage piston 18 and the sewage spout 19 constitutes a sewage channel;

The filter mechanism further includes a filter bottle scraper, which is sleeved on the outside of the filter screen 10 and can rotate synchronously with the filter mechanism, and the filter bottle scraper at least partially abuts the inner wall of the filter bottle 17;

The filter bottle scraper includes a frame 16 and a plurality of scraping fins 15 fixed on the outside of the frame 16, and the scraping fins 15 abut against the inner wall of the filter bottle 17;

The frame 16 can move up and down synchronously with the filter mechanism. When moving down, the bottom end of the frame 16 abuts against the sealing portion 18a of the sewage piston 18, the drainage structure is closed, and the water flows from the outlet of the central water inlet pipe 14 into the filter mechanism and the filter bottle 17. The inside of the cavity is filtered and flows out through the purified water outlet; when moving upward, the bottom end of the skeleton 16 is separated from the sewage piston 18, the drainage structure is closed, and the water flows from the outlet of the central water inlet pipe 14 into the sewage channel and then flows out. The sheet 15 is arranged in a spiral shape on the outside of the frame 16, including a left spiral shape and a right spiral shape.

The above-mentioned embodiment is only a preferred solution of the present invention, and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

As described, the drive control assembly can also adopt a worm gear structure, and the specific structure is as follows:

The impeller 6 is arranged in the assembly cavity, and the fins of the impeller 6 correspond to the water inlet port of the nose 7 and receive the power of the water flow at the water inlet port;

The electric adjustment mechanism includes a drive motor 22, a worm gear structure, a seal 5, and an adjustment mechanism assembly seat 4. Any one of the turbine and worm is connected to the output shaft of the drive motor 22, the other is fixed to the end of the drive shaft, and the drive shaft penetrates After the adjustment mechanism assembly seat 4 is sealed by the seal 5, the adjustment mechanism assembly seat 4 is fixed with the machine head 7, and the drive motor 22 drives the turbine or worm to drive the drive shaft to move up and down. After moving up for a certain stroke, the impeller 6 Keep the linkage with the drive shaft, after moving down for a certain stroke, the impeller 6 is disconnected from the drive shaft;

The axial stroke value that can be achieved by the worm and worm structure is compatible with the stroke value required for the linkage between the drive shaft and the impeller 6 or for unlinking.

In addition, the drive control component can also be realized by a telescopic cylinder, and the drive control component includes:

The impeller 6 is arranged in the assembly cavity, and the fins of the impeller 6 correspond to the water inlet port of the nose 7 and receive the power of the water flow at the water inlet port;

The pneumatic adjustment mechanism includes a telescopic cylinder, a seal 5 and an adjustment mechanism assembly seat 4, the drive shaft passes through the adjustment mechanism assembly seat 4 and is sealed by the seal 5, the telescopic cylinder is arranged vertically, the piston rod of the telescopic cylinder 4 and the drive shaft end The part is fixed, the adjusting mechanism assembly seat is fixed with the machine head 7. The telescopic cylinder drives the drive shaft to move up and down in the axial direction. After moving up for a certain stroke, the impeller 6 keeps linkage with the drive shaft. After moving down for a certain stroke, the impeller 6 and The drive shaft is disconnected from the linkage, and the stroke value of the telescopic cylinder is adapted to the stroke value required for the linkage of the drive shaft and the impeller 6 or for the release of linkage.

The specific structure of the turbo screw and the structure of the telescopic cylinder are derived from the prior art. The present invention is only an integrated use of it as a power source. The description of the technical text solution by a person of ordinary skill in the art can realize the cost without creative work. Invented technical solutions.

Claims (20)

Pre-filter with filter screen self-cleaning function, including a machine head with inlet and outlet ports, a filter bottle connected with the machine head, and a drainage structure connected with the lower end of the filter bottle. The filter bottle is equipped with a filter mechanism and a filter mechanism. It includes a water diversion cover, a filter frame, a central water inlet pipe and a filter screen, and is characterized in that: An assembly cavity is provided on the top of the handpiece, and a driving mechanism is fixed in the assembly cavity; The drive mechanism includes a drive control assembly and a drive shaft. The drive shaft extends axially into the filter mechanism and is fixed to the filter mechanism. The power output end of the drive control assembly is in variable clutch linkage with the drive shaft. When the power output end of the drive shaft is disconnected from the drive shaft, the drainage structure of the drainage structure is closed. When the power output end of the drive control assembly maintains linkage with the drive shaft, the drainage structure of the drainage structure opens. When the linkage is maintained, the filter mechanism can be driven Driven by the control assembly, it rotates through centrifugal force to realize self-cleaning and decontamination of the filter. The pre-filter with filter screen self-cleaning function according to claim 1, characterized in that: the drive control component comprises: The impeller is arranged in the assembly cavity, and the fins of the impeller correspond to the water inlet port of the nose, and receive the power of the water flow at the water inlet port; Manual adjustment mechanism, including adjustment knob, seal and adjustment knob assembly seat, the drive shaft passes through the adjustment knob assembly seat and is sealed by the seal, the adjustment knob is fixed to the end of the drive shaft, the adjustment knob assembly seat is fixed with the head, the adjustment knob Relying on the adjusting knob assembly seat, it can at least move up and down axially. After moving up for a certain stroke, the impeller and the drive shaft maintain linkage, and after moving down for a certain stroke, the impeller and the drive shaft are disconnected from linkage; The axial stroke value of the adjusting knob relative to the adjusting knob assembly seat is adapted to the stroke value of the linkage and unlinking of the impeller and the drive shaft. The pre-filter with filter screen self-cleaning function according to claim 1, characterized in that: the drive control component comprises: The impeller is arranged in the assembly cavity, and the fins of the impeller correspond to the water inlet port of the nose, and receive the power of the water flow at the water inlet port; Hand-automatic integrated adjustment mechanism, including adjustment knob, seal, transmission buckle, drive motor, motor bracket and adjustment knob assembly seat, the drive shaft passes through the adjustment knob assembly seat and is sealed by the seal, and the adjustment knob is fixed to the end of the drive shaft , The adjusting knob assembly base is fixed with the machine head; The motor bracket is fixed on the top of the adjusting knob assembly seat. The end of the drive motor is vertically fixed with a screw rod. The screw rod is screwed to the transmission buckle. After passing through the motor bracket, the transmission buckle and the adjustment knob can be detached and fixed. The adjustment knob can rely on the adjustment knob assembly seat, and can at least move up and down axially. After moving up for a certain stroke, the impeller and the drive shaft maintain linkage, and after a certain stroke down, the impeller and the drive shaft are disconnected from the linkage; The length of the screw rod is compatible with the stroke value required for the linkage or release of the drive shaft and the impeller, and the stroke value of the adjustment knob relative to the upper and lower axial actions of the adjustment knob assembly seat. The pre-filter with filter screen self-cleaning function according to claim 1, characterized in that: the drive control component comprises: The impeller is arranged in the assembly cavity, and the fins of the impeller correspond to the water inlet port of the nose, and receive the power of the water flow at the water inlet port; The electric adjustment mechanism includes a drive motor, a worm gear structure, a seal and an adjustment mechanism assembly seat. Any one of the turbine and worm is connected to the output shaft of the drive motor, the other is fixed to the end of the drive shaft, and the drive shaft is assembled through the adjustment mechanism The seat is sealed by a seal. The adjusting mechanism assembly seat is fixed with the machine head. The drive motor drives the turbine or worm to drive the upper and lower axial movements of the drive shaft. After a certain stroke of upward movement, the impeller and drive shaft maintain linkage, and the downward movement is constant. After the stroke, the impeller is disconnected from the drive shaft; The axial stroke value that can be realized by the worm gear structure is compatible with the stroke value required for the linkage of the drive shaft and the impeller or for releasing the linkage. The pre-filter with filter screen self-cleaning function according to claim 1, characterized in that: the drive control component comprises: The impeller is arranged in the assembly cavity, and the fins of the impeller correspond to the water inlet port of the nose, and receive the power of the water flow at the water inlet port; The pneumatic adjustment mechanism includes a telescopic cylinder, a seal and an assembly seat of the adjustment mechanism. The drive shaft passes through the assembly seat of the adjustment mechanism and is sealed by the seal. The telescopic cylinder is arranged vertically. The piston rod of the telescopic cylinder is fixed with the end of the drive shaft. The adjustment mechanism The assembly base is fixed with the machine head. The telescopic cylinder drives the drive shaft to move up and down axially. After a certain stroke of upward movement, the impeller and drive shaft maintain linkage. After a certain stroke of downward movement, the impeller and drive shaft are disconnected from the linkage and the cylinder is extended. The stroke value of the drive shaft is compatible with the stroke value required for linkage or unlinking of the drive shaft and the impeller. The pre-filter with filter screen self-cleaning function according to claim 2 or 3 or 4 or 5, characterized in that: the drive shaft is also provided with a rotation resistance reducing structure to ensure that the impeller and the drive shaft can maintain linkage Under the condition that the impeller transmits the power of the water flow, it moves in a circular motion freely and overcomes the loss of the water flow force to the greatest extent. The pre-filter with filter screen self-cleaning function according to claim 6, characterized in that the rotation resistance reduction structure is realized in the following way: the drive shaft is arranged in at least two sections, the first section is the adjustment section, and the other section is A driving section, at least the top of the driving section is provided with a cavity, and the driving section is also provided with a first linkage part linked with the impeller and a second linkage part linked with the central water inlet pipe; The adjusting section and the driving section are sleeved and capable of relative rotation, and at the same time can drive the driving section and the central water inlet pipe to move axially; The tail end of the driving section extends into the sewage structure after passing through the central water inlet pipe, and is connected to the sewage structure in a rotary sealing manner. The pre-filter with filter screen self-cleaning function according to claim 7, characterized in that the drive shaft is arranged in at least three sections, the first section is the adjustment section, the second section is the drive section, and the third section is the guide section. The fixed section, at least the top of the driving section is provided with a cavity, and the first linkage portion and the second linkage portion are provided at both ends of the driving section; The adjusting section and the driving section are sleeved and capable of relative rotation. The bottom end of the adjusting section extends and the driving section is axially limited with the central water inlet pipe through a limiter. The adjusting section can drive the driving section and the central water inlet pipe to move axially as a whole ； One end of the guide fixed section is sleeved on the central water inlet pipe, and is axially restricted by the limiter, which can move axially with the central water inlet pipe, and the central water inlet pipe and the guide fixed section can rotate synchronously or asynchronously, and the other end extends to the sewage discharge Inside the structure, and sealed connection with the sewage structure. The pre-filter with filter screen self-cleaning function according to claim 7 or 8, characterized in that: the assembly cavity of the pre-filter is further provided with a cut-off cover, and the side of the cut-off cover is provided with water holes, The cut-off cover is sleeved with the regulating section and covered outside the impeller. The cut-off cover is linked with the regulating section. After the impeller and the drive section are linked, the impeller and the cut-off cover can independently rotate to a certain angle. Preferably, there is a limit stop in the assembly cavity The limit part of the rotation angle of the cover, the maximum rotation angle of the cut-off cover is 90°. The pre-filter with filter screen self-cleaning function according to claim 2 or 3 or 4 or 5, characterized in that: at least one assembly groove is provided in the center axis of the impeller, and at least one fitting groove is provided on the opposite part of the drive shaft. The equipped assembly bar realizes linkage through the cooperation of the assembly groove and the assembly bar by external force, and realizes the disconnection linkage through the disengagement of the assembly groove and the assembly bar. The pre-filter with filter screen self-cleaning function according to claim 2, characterized in that: the manual adjustment mechanism further includes a first limiting member and a second limiting member, and the drive shaft includes a first limiting slot And the second limiting slot, the adjusting knob is sleeved with the drive shaft, and the two ends are respectively limited by the first limiting member, the first limiting slot, the second limiting member, and the second limiting slot. The limiting member and the second limiting member both include a circlip, a steel wire clamp, and a limiting structure such as a mold pressing or a turning boss. The pre-filter with filter screen self-cleaning function according to claim 2, characterized in that: the adjusting knob assembly seat is screwed to the machine head, and at least one sliding groove is provided in the axial direction, and the adjusting knob is correspondingly provided with At least one sliding block can be axially slid up and down under the action of external force through the cooperation of the sliding groove and the sliding block. After sliding to a certain stroke, the impeller and the drive shaft are linked, and the adjusting knob can also be rotated to a certain angle in a circle. The pre-filter with filter screen self-cleaning function according to claim 3, characterized in that: the manual-automatic integrated adjustment mechanism further comprises a first limiter and a second limiter, and the drive shaft includes a first limiter The position slot and the second limit slot, the adjusting knob is sleeved with the drive shaft, and the two ends are respectively limited and fixed by the first limit piece, the first limit slot, the second limit piece, and the second limit slot. Both the first limiting member and the second limiting member include a circlip, a steel wire clamp, and a limiting structure such as a mold pressing or a turning boss. The pre-filter with filter screen self-cleaning function according to claim 2 or 3 or 4 or 5, characterized in that: the water in the water inlet port enters along the tangential direction to obtain the maximum contact area with the impeller and obtain With the largest impeller driving force, the water outlet of the assembly cavity is set eccentrically and close to the edge of the impeller. The pre-filter with filter screen self-cleaning function according to claim 2 or 3 or 4 or 5, characterized in that: the sewage structure includes a sewage nozzle and a sewage piston, and the sewage nozzle is rotatably connected to the bottom of the filter bottle The bottom end of the blowdown piston and the bottom end of the drive shaft are axially fixed. When the drive shaft moves downwards to release the linkage, the blowdown piston and the blowdown port abut to seal the sewage path, and when the drive shaft maintains linkage upwards, the blowdown piston and the blowdown port are released When abutting, the sewage line opens. The pre-filter with filter screen self-cleaning function according to claim 15, characterized in that: the central water inlet pipe is fully closed circumferentially, is sleeved with the drive shaft and is fixed in a radially relative position, and the filter frame is sleeved on the central water inlet pipe The external and radial relative positions are fixed, the cavity between the filter frame and the central water inlet pipe constitutes the first raw water channel, the filter is sleeved and fixed on the outside of the filter frame, and the cavity between the filter bottle and the filter constitutes the second Raw water channel, the first and second raw water channels are connected at least when the drainage water channel of the sewage structure is closed; The top of the filter frame is sleeved in the assembly cavity of the water diversion cover and the contact surface between the two can be sealed. The upper part of the water diversion cover assembly cavity has a larger diameter than the lower part, and the water diversion cover and the drive shaft are sealed by a seal , The water diversion cover is provided with a raw water inlet and a purified water outlet, and a number of seals are arranged between the water diversion cover and the filter bottle to isolate the raw water inlet and the purified water outlet; When the sewage line is closed and the filter mechanism is normally filtered, the water diversion cover is sealed with the filter frame and the raw water and purified water do not flow; when the sewage line is opened, the water diversion cover and the filter frame are unsealed, and the water diversion cover assembly cavity and filter The top of the net frame cooperates with each other to realize that the raw water and purified water do not flow. The pre-filter with filter screen self-cleaning function according to claim 1, characterized in that: the filter mechanism further comprises a filter bottle scraper, which is sleeved on the outside of the filter screen and can rotate synchronously with the filter mechanism. The filter bottle scraper at least partially abuts against the inner wall of the filter bottle. The pre-filter with filter screen self-cleaning function according to claim 17, characterized in that: the filter bottle scraper includes a frame and a number of scraping fins fixed on the outside of the frame, the scraping fins and The inner wall of the filter bottle abuts. The pre-filter with filter screen self-cleaning function according to claim 18, wherein the scraping fins are spirally arranged outside the frame, including a left spiral shape and a right spiral shape. The pre-filter with filter screen self-cleaning function according to claim 2 or 3 or 4 or 5, characterized in that: the sewage structure includes a sewage nozzle and a sewage piston, and the sewage nozzle is rotatably connected to the bottom of the filter bottle For the sewage outlet, the sewage piston is fixed in the sewage nozzle, and the top of the sewage piston is provided with a sealing part whose diameter is larger than other parts. The gap between the sewage piston and the sewage nozzle constitutes the sewage channel; The filter mechanism further includes a filter bottle scraper, sleeved on the outside of the filter screen and capable of rotating synchronously with the filter mechanism, the filter bottle scraper at least partially abuts against the inner wall of the filter bottle; The filter bottle scraper includes a frame and a plurality of scraping wings fixed on the outside of the frame, and the scraping wings abut against the inner wall of the filter bottle; The frame can move up and down synchronously with the filter mechanism. When moving down, the bottom end of the frame abuts against the sealing part of the sewage piston, the drainage structure is closed, and the water flows from the outlet of the central water inlet pipe into the cavity between the filter mechanism and the filter bottle, and passes through the filter. , Flows out through the purified water outlet; when moving upward, the bottom end of the skeleton is separated from the sewage piston, the drainage structure is opened, and the water flows into the sewage channel from the outlet of the central water inlet pipe and then flows out. Preferably, the scraping fins are spiral outside the skeleton Shape settings, including left spiral and right spiral.

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