Self-cleaning filter and control method

Abstract

The present invention provides a self-cleaning filter and a control method thereof, comprising a filter body, a grinder, a sewage pump, a sewage valve and a stop check valve, wherein the filter body, the grinder, the sewage pump and the sewage valve are connected in sequence through a pipeline to form a sewage discharge channel, one end of the stop check valve is connected to the filter body, and the other end is connected to the pipeline between the sewage pump and the sewage valve, the filter body, the grinder, the sewage pump and the stop check valve are connected in sequence through a pipeline to form a sewage circulation channel, a filter screen and a cleaning unit are provided in the filter body, the filter screen is used to filter impurities in sewage, and the cleaning unit is used to clean impurities on the filter screen, the self-cleaning filter and the control method described in the present application can clean impurities on the surface of the filter screen in time, grind impurities in sewage, ensure the filtering effect of the filter screen and reduce sewage discharge, and can also discharge turbid sewage in the filter body in time, reducing the frequency and cleaning time of filter self-cleaning.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power and water treatment, and in particular to a self-cleaning filter and a control method thereof. Background Art

[0002] At present, self-cleaning filters have been widely used in power plants, ships, petrochemical industries and other industries. They are mainly used to filter fluid impurities in pipeline systems to ensure the normal operation of pipelines and equipment. However, due to the limitations of the filter structure itself and the influence of the use environment, there are still many problems in the use process. The main problems are reflected in two aspects: 1) During the cleaning process, the filter does not clean the filter surface thoroughly enough, resulting in the filter self-cleaning time interval (the self-cleaning time is the time between the end of the current self-cleaning time and the start of the next self-cleaning time) becoming shorter and shorter, and eventually there will be uninterrupted self-cleaning, affecting the normal cleaning effect of the filter screen; 2) When the filter is self-cleaning, the filter needs to clean the filter surface for a long time, resulting in a large amount of sewage waste, and also affecting the normal discharge flow of the filter outlet. That is, while the sewage outlet flow increases, the filter outlet flow will decrease, and the number of outlet flow fluctuations will also increase, which will affect the equipment performance of the subsequent pipeline system. Therefore, it is urgent to seek a new type of self-cleaning filter and cleaning method to thoroughly clean impurities on the filter surface and reduce sewage discharge. Summary of the Invention

[0003] In view of this, the present invention aims to provide a self-cleaning filter and a control method to solve the problems in the prior art of incomplete cleaning of the filter surface, long cleaning time, and large amount of sewage discharged during cleaning.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A self-cleaning filter comprises a filter body, a grinder, a sewage pump, a sewage valve and a stop check valve, the filter body, grinder, sewage pump and sewage valve being connected in sequence through a pipeline to form a sewage discharge channel, one end of the stop check valve being connected to the filter body, and the other end being connected to the pipeline between the sewage pump and the sewage valve, the filter body, grinder, sewage pump and stop check valve being connected in sequence through a pipeline to form a sewage circulation channel, the grinder being used to grind impurities discharged from the filter body, the sewage pump being used to provide power for the circulating discharge of sewage in the filter body, the sewage valve being used to discharge sewage in the sewage discharge channel, the stop check valve being used to control the sewage to flow back to the filter body through the sewage circulation channel, a filter screen and a cleaning unit being provided in the filter body, the filter screen being used to filter impurities in the sewage, and the cleaning unit being used to clean impurities on the filter screen.

[0006] This structure can not only clean the impurities on the surface of the filter in time, but also crush the impurities in the sewage through the sewage circulation channel, ensuring the filtering effect of the filter and reducing sewage discharge, and can timely discharge the turbid sewage in the filter body through the sewage channel, ensuring the normal operation of the self-cleaning filter, reducing the frequency and cleaning time of the filter self-cleaning, improving the filtering efficiency and saving electricity.

[0007] Furthermore, a sewage suction pipe is provided in the filter body, the filter screen is provided at the upper part of the filter body, the sewage suction pipe is provided in the center of the filter body, the cleaning unit is provided at the upper part of the sewage suction pipe, and a motor is provided at the top of the filter body. The upper end of the sewage suction pipe is connected to the drive shaft of the motor, and the lower end is installed at the bottom of the filter body. The sewage suction pipe is used to absorb the sewage treated by the cleaning unit.

[0008] This setting can not only clean the impurities on the surface of the filter in time, but also pump out the sewage containing impurities in time, and it has a simple structure and is easy to produce and maintain.

[0009] Furthermore, the lower part of the filter body is provided with a water inlet pipe port and a sewage return pipe port, the upper part is provided with a water outlet pipe port, and the bottom is provided with a sewage discharge pipe port. The water inlet pipe port is used to introduce sewage into the interior of the filter body, and the water outlet pipe port is used to discharge sewage filtered by the filter screen. The sewage discharge pipe port is connected to the lower end of the sewage suction pipe, the sewage return pipe port is connected to the stop check valve, and the sewage discharge pipe port is connected to the grinder.

[0010] This structure facilitates filtering and discharging of sewage in the filter body.

[0011] Furthermore, the cleaning unit includes a strip scraper, a strip steel brush and a strip suction nozzle installed in sequence on the sewage suction pipe, and the strip scraper, the strip steel brush and the strip suction nozzle are spaced apart at an angle of α°. The strip scraper is used to scrape off larger impurities on the surface of the filter, the strip steel brush is used to remove smaller impurities on the surface of the filter, and the strip suction nozzle is used to absorb impurity-containing sewage on the surface of the filter and nearby areas.

[0012] This structure can clean the impurities on the filter surface in time to ensure the normal operation of the filter body.

[0013] Furthermore, a mounting bracket is provided on the upper part of the sewage suction pipe, and the strip scraper, strip steel brush and strip suction nozzle are all arranged on the mounting bracket, and elastic elements are provided between the strip scraper, strip steel brush, strip suction nozzle and the mounting bracket, and the elastic elements can control the distance between the strip scraper, strip steel brush, strip suction nozzle and the filter.

[0014] This structure can ensure that the distance between the strip scraper, the strip steel brush, the strip suction nozzle and the filter screen is always maintained in a reasonable range, ensuring that the cleaning unit can clean the impurities on the surface of the filter screen.

[0015] Furthermore, a control box is provided on the filter body, and the control box is electrically connected to the motor, grinder, sewage pump and sewage valve respectively. A control module is provided in the control box, and the control module is used to control the operating status of the motor, grinder, sewage pump, sewage valve and stop check valve.

[0016] The operating states of the motor, grinder, sewage pump, sewage valve and stop check valve can be controlled in real time through the control box to ensure the normal operation of the self-cleaning filter.

[0017] Furthermore, a differential pressure transmitter is provided on the filter body, and the differential pressure transmitter is used to detect the pressure difference inside and outside the filter. The detection value of the differential pressure transmitter is X, and the set value of the system is Y. The control module controls the operating status of the motor, grinder, sewage pump, sewage valve and stop check valve according to the difference between X and Y.

[0018] This structure can control the operating states of the motor, grinder, sewage pump, sewage valve and stop check valve according to the pressure difference between the inside and outside of the filter, thereby ensuring the normal operation of the self-cleaning filter.

[0019] Furthermore, a pressure gauge is provided on the filter body, and the pressure gauge can display the pressure values ​​inside and outside the filter in real time.

[0020] This structure makes it easy for users to check the pressure difference inside and outside the filter and adjust the working status of the self-cleaning filter.

[0021] Furthermore, a timer is provided in the control box, which is used to calculate the time t of the filter self-cleaning interval. The system setting value is T. The control module controls the operating status of the motor, grinder, sewage pump, sewage valve and stop check valve according to the difference between t and T.

[0022] This arrangement can control the operating states of the motor, grinder, sewage pump, sewage valve and stop check valve according to the interval time difference of the filter self-cleaning, thereby ensuring the normal operation of the self-cleaning filter.

[0023] The present invention also provides a control method based on the above self-cleaning filter, comprising the steps of:

[0024] Steps: The medium enters the interior of the filter body through the water inlet pipe. If the differential pressure transmitter measures X<Y, then proceed to step 1; if the differential pressure transmitter measures X≥Y and the timer measures t>T, then proceed to step 2; if the differential pressure transmitter measures X≥Y and the timer measures t<T, then proceed to step 3;

[0025] Steps: The medium is filtered through the filter and then discharged from the outlet pipe;

[0026] Steps: The control box starts the sewage circulation channel, the motor rotates clockwise, and drives the strip scraper and strip steel brush on the sewage suction pipe to operate, remove impurities on the surface of the filter screen, and suck the sewage containing impurities into the sewage suction pipe through the strip suction nozzle. Then, under the action of the sewage pump, the sewage containing impurities enters the grinder through the sewage discharge pipe port for crushing, and then returns to the filter body through the stop check valve; if X<Y, then enter step;

[0027] Steps: The control box starts the sewage discharge channel, the motor rotates clockwise, driving the strip scraper and strip steel brush on the sewage suction pipe to operate, removing impurities on the surface of the filter screen, and sucking the sewage containing impurities into the sewage suction pipe through the strip suction nozzle. Then, under the action of the sewage pump, the sewage containing impurities enters the grinder through the sewage discharge pipe port, is crushed, and is discharged through the sewage valve; if X<Y, then enter step.

[0028] This control method controls the operation of the sewage circulation channel and the sewage discharge channel by detecting the pressure difference between the inside and outside of the filter and the time of the filter self-cleaning interval. It can not only clean the impurities on the surface of the filter in time through the sewage circulation channel, ensure the filtering effect of the filter, reduce sewage discharge, save resources and costs, but also discharge the sewage in the filter body in time through the sewage discharge channel, reduce the self-cleaning frequency and cleaning time of the filter, and ensure the normal operation of the self-cleaning filter.

[0029] Compared with the prior art, the self-cleaning filter and control method of the present invention have the following advantages:

[0030] 1) By detecting the pressure difference between the inside and outside of the filter and the time of the filter self-cleaning interval, the operating status of the equipment can be controlled, and the impurities on the surface of the filter can be cleaned in time to keep the filter surface clean. Then, the impurities in the filter body are cleaned and crushed through the sewage circulation channel, thereby improving the filtering effect of the filter, reducing sewage discharge and saving costs.

[0031] 2) The turbid sewage in the filter body can be discharged in time through the sewage discharge channel, reducing the self-cleaning frequency and cleaning time of the filter, ensuring the normal operation of the self-cleaning filter, improving the filtration efficiency and saving electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of the self-cleaning filter according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic structural diagram of the self-cleaning filter according to an embodiment of the present invention from a second perspective;

[0034] Figure 3 This is a schematic structural diagram of the filter body according to an embodiment of the present invention;

[0035] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure at A in the middle;

[0036] Figure 5 This is a schematic diagram of the operation of the sewage circulation channel of the self-cleaning filter according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the operation of the sewage discharge channel of the self-cleaning filter according to an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Filter body; 11. Water inlet pipe; 12. Water outlet pipe; 13. Sewage discharge pipe; 14. Sewage return pipe; 2. Grinder; 3. Sewage pump; 4. Sewage discharge valve; 5. Stop check valve; 6. Sewage suction pipe; 60. Mounting bracket; 61. Strip scraper; 62. Strip steel brush; 63. Strip suction nozzle; 64. Elastic element; 7. Control box; 71. Control module; 72. Timer; 8. Differential pressure transmitter; 9. Pressure gauge; 100. Filter; 200. Cleaning unit; 300. Motor. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] Example 1

[0042] like Figures 1 to 6 As shown, a self-cleaning filter includes a filter body 1, a grinder 2, a sewage pump 3, a sewage valve 4 and a stop check valve 5. The filter body 1, the grinder 2, the sewage pump 3 and the sewage valve 4 are connected in sequence through a pipeline to form a sewage discharge channel. One end of the stop check valve 5 is connected to the filter body 1, and the other end is connected to the pipeline between the sewage pump 3 and the sewage valve 4. The filter body 1, the grinder 2, the sewage pump 3 and the stop check valve 5 are connected in sequence through a pipeline to form a sewage circulation channel. The grinder 2 is used to grind impurities discharged from the filter body 1, the sewage pump 3 is used to provide power for the circulation discharge of sewage in the filter body 1, the sewage valve 4 is used to discharge the sewage in the sewage channel, and the stop check valve 5 is used to control the sewage to flow back to the filter body 1 through the sewage circulation channel. A filter screen 100 and a cleaning unit 200 are provided in the filter body 1. The filter screen 100 is used to filter impurities in the sewage, and the cleaning unit 200 is used to clean the impurities on the filter screen 100.

[0043] The self-cleaning filter described in the present application can clean impurities on the surface of the filter 100 in time by arranging a cleaning unit 200 in the filter body 1, so that the filter maintains a good filtering effect. By arranging a sewage circulation channel, it can not only clean and crush impurities in the filter body 1, improve the filtering effect of the filter 100, but also reduce the discharge of sewage and save costs. By arranging a sewage channel, the turbid sewage in the filter body 1 can be discharged in time, so that the self-cleaning filter can operate normally. This structure can not only clean impurities on the surface of the filter 100 in time, but also crush impurities in the sewage through the sewage circulation channel, ensure the filtering effect of the filter 100 and reduce sewage discharge, and can discharge turbid sewage in the filter body in time through the sewage channel, ensure the normal operation of the self-cleaning filter, reduce the frequency and cleaning time of the filter self-cleaning, improve the filtering efficiency, and save electricity.

[0044] As a preferred example of the present invention, a sewage suction pipe 6 is provided in the filter body 1, the filter screen 100 is provided at the upper part of the filter body 1, the sewage suction pipe 6 is provided in the center of the filter body 1, the cleaning unit 200 is provided at the upper part of the sewage suction pipe 6, and a motor 300 is provided at the top of the filter body 1. The upper end of the sewage suction pipe 6 is connected to the drive shaft of the motor 300, and the lower end is installed at the bottom of the filter body 1. The sewage suction pipe 6 is used to absorb the sewage treated by the cleaning unit 200.

[0045] Specifically, the suction pipe 6 rotates under the drive of the motor 300, and the cleaning unit 200 cleans the impurities on the surface of the filter 100 under the drive of the suction pipe 6. At the same time, the suction pipe 6 extracts the sewage containing impurities after cleaning by the cleaning unit 200. This setting can not only clean the impurities on the surface of the filter 100 in time, but also extract the sewage containing impurities in time, and has a simple structure and is convenient for production and maintenance.

[0046] As a preferred example of the present invention, the lower part of the filter body 1 is provided with a water inlet pipe port 11 and a sewage return pipe port 14, the upper part is provided with a water outlet pipe port 12, and the bottom is provided with a sewage discharge pipe port 13. The water inlet pipe port 11 is used to introduce sewage into the interior of the filter body 1, and the water outlet pipe port 12 is used to discharge sewage filtered by the filter screen 100. The sewage discharge pipe port 13 is connected to the lower end of the sewage suction pipe 6, the sewage return pipe port 14 is connected to the stop check valve 5, and the sewage discharge pipe port 13 is connected to the grinder 2.

[0047] Specifically, this structure facilitates filtering and discharging of sewage in the filter body 1 .

[0048] As a preferred example of the present invention, the cleaning unit 200 includes a strip scraper 61, a strip steel brush 62 and a strip suction nozzle 63, which are sequentially installed on the sewage suction pipe 6. The strip scraper 61, the strip steel brush 62 and the strip suction nozzle 63 are spaced apart from each other at an angle of α°. The strip scraper 61 is used to scrape off larger impurities on the surface of the filter 100, the strip steel brush 62 is used to remove smaller impurities on the surface of the filter 100, and the strip suction nozzle 63 is used to absorb impurity-containing sewage on and near the surface of the filter 100.

[0049] Specifically, when cleaning the filter 100, first use the strip scraper 61 to clean large impurities on the surface of the filter 100, then use the strip steel brush 62 to clean small impurities on the surface of the filter 100, and finally use the strip suction nozzle 63 to suck away and discharge the sewage containing impurities. At the same time, by setting the angle between the strip scraper 61, the strip steel brush 62 and the strip suction nozzle 63 to α°, the cleaning effect of the cleaning unit 200 on the filter 100 can be improved. This structure can clean the impurities on the surface of the filter 100 in time, ensuring the normal operation of the filter body 1.

[0050] Preferably, 30°<α<60°.

[0051] As a preferred example of the present invention, a mounting bracket 60 is provided on the upper part of the sewage suction pipe 6, and the strip scraper 61, the strip steel brush 62 and the strip suction nozzle 63 are all arranged on the mounting bracket 60, and an elastic element 64 is provided between the strip scraper 61, the strip steel brush 62, the strip suction nozzle 63 and the mounting bracket 60, and the elastic element 64 can control the distance between the strip scraper 61, the strip steel brush 62, the strip suction nozzle 63 and the filter 100.

[0052] Specifically, this structure can ensure that the distance between the strip scraper 61, the strip steel brush 62, the strip suction nozzle 63 and the filter 100 is always maintained in a reasonable range, ensuring that the cleaning unit 200 can clean the impurities on the surface of the filter 100.

[0053] As a preferred example of the present invention, a control box 7 is also provided on the filter body 1, and the control box 7 is electrically connected to the motor 300, the grinder 2, the sewage pump 3 and the sewage valve 4 respectively. A control module 71 is provided in the control box 7, and the control module 71 is used to control the operating status of the motor 300, the grinder 2, the sewage pump 3, the sewage valve 4 and the stop check valve 5.

[0054] Specifically, the operating states of the motor 300, the grinder 2, the sewage pump 3, the sewage valve 4 and the stop check valve 5 can be controlled in real time by the control box 7 to ensure the normal operation of the self-cleaning filter.

[0055] As a preferred example of the present invention, a differential pressure transmitter 8 is provided on the filter body 1, and the differential pressure transmitter 8 is used to detect the pressure difference inside and outside the filter 100. The detection value of the differential pressure transmitter 8 is X, and the set value of the system is Y. The control module 71 controls the operating status of the motor 300, the grinder 2, the sewage pump 3, the sewage valve 4 and the stop check valve 5 according to the difference between X and Y.

[0056] Specifically, this structure can control the operating states of the motor 300, grinder 2, sewage pump 3, sewage valve 4 and stop check valve 5 according to the pressure difference between the inside and outside of the filter 100, thereby ensuring the normal operation of the self-cleaning filter.

[0057] As a preferred example of the present invention, a pressure gauge 9 is provided on the filter body 1 , and the pressure gauge 9 can display the pressure values ​​inside and outside the filter 100 in real time.

[0058] Specifically, this structure allows the user to easily check the pressure difference between the inside and outside of the filter 100 and adjust the working state of the self-cleaning filter.

[0059] As a preferred example of the present invention, a timer 72 is also provided in the control box 7. The timer 72 is used to calculate the time t of the filter self-cleaning interval. The system setting value is T. The control module 71 controls the operating status of the motor 300, the grinder 2, the sewage pump 3, the sewage valve 4 and the stop check valve 5 according to the difference between t and T.

[0060] Specifically, this arrangement can control the operating states of the motor 300, grinder 2, sewage pump 3, sewage valve 4 and stop check valve 5 according to the interval time difference of the filter self-cleaning, thereby ensuring the normal operation of the self-cleaning filter.

[0061] Preferably, 3min≤T≤8min.

[0062] Example 2

[0063] like Figures 1 to 6 As shown, a control method for a self-cleaning filter includes the steps of:

[0064] Step 1: The medium enters the interior of the filter body 1 through the water inlet pipe 11. If the differential pressure transmitter 8 measures X<Y, then proceed to step 2; if the differential pressure transmitter 8 measures X≥Y and the timer 72 measures t>T, then proceed to step 3; if the differential pressure transmitter 8 measures X≥Y and the timer 72 measures t<T, then proceed to step 4;

[0065] Step 2: The medium is filtered through the filter screen 100 and then discharged from the outlet pipe 12;

[0066] Step 3: The control box 7 starts the sewage circulation channel, and the motor 300 rotates clockwise, driving the strip scraper 61 and the strip steel brush 62 on the sewage suction pipe 6 to operate, removing impurities on the surface of the filter 100, and sucking the sewage containing impurities into the sewage suction pipe 6 through the strip suction nozzle 63. Then, under the action of the sewage pump 3, the sewage containing impurities enters the grinder 2 through the sewage discharge pipe 13 for crushing, and then returns to the filter body 1 through the stop check valve 5; if X < Y, then go to step 1;

[0067] Step 4: The control box 7 starts the sewage discharge channel, and the motor 300 rotates clockwise, driving the strip scraper 61 and the strip steel brush 62 on the sewage suction pipe 6 to operate, removing impurities on the surface of the filter 100, and sucking the sewage containing impurities into the sewage suction pipe 6 through the strip suction nozzle 63. Then, under the action of the sewage pump 3, the sewage containing impurities enters the grinder 2 through the sewage discharge pipe port 13, is crushed, and is discharged through the sewage valve 4; if X<Y, go to step 1.

[0068] Specifically, this control method controls the operation of the sewage circulation channel and the sewage discharge channel by detecting the pressure difference between the inside and outside of the filter 100 and the time of the filter self-cleaning interval. It can not only clean the impurities on the surface of the filter 100 in time through the sewage circulation channel, ensure the filtering effect of the filter 100, reduce sewage discharge, save resources and costs, but also discharge the sewage in the filter body 1 in time through the sewage discharge channel, reduce the self-cleaning frequency and cleaning time of the filter, and ensure the normal operation of the self-cleaning filter.

[0069] To sum up, the self-cleaning filter and control method described in the present application control the operating status of the equipment by detecting the pressure difference between the inside and outside of the filter 100 and the time of the filter self-cleaning interval. On the one hand, it can clean the impurities on the surface of the filter 100 in time to keep the surface of the filter 100 clean, and then clean and crush the impurities in the filter body 1 through the sewage circulation channel, thereby improving the filtering effect of the filter 100, reducing sewage discharge, and saving costs. On the other hand, the turbid sewage in the filter body 1 can be discharged in time through the sewage channel, reducing the self-cleaning frequency and cleaning time of the filter, ensuring the normal operation of the self-cleaning filter, improving the filtration efficiency, and saving electricity.

[0070] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A self-cleaning filter, characterized in that: The invention comprises a filter body (1), a grinder (2), a sewage pump (3), a sewage valve (4) and a stop check valve (5), wherein the filter body (1), the grinder (2), the sewage pump (3) and the sewage valve (4) are sequentially connected through a pipeline to form a sewage discharge channel, one end of the stop check valve (5) is connected to the filter body (1), and the other end is connected to the pipeline between the sewage pump (3) and the sewage valve (4), and the filter body (1), the grinder (2), the sewage pump (3) and the stop check valve (5) are sequentially connected through a pipeline to form a sewage discharge circulation channel, and the grinder (2) is connected to the sewage pump (3) and the stop check valve (5). The filter body (1) is used to crush impurities discharged from the filter body (1), the sewage pump (3) is used to provide power for the circulation discharge of sewage in the filter body (1), the sewage valve (4) is used to discharge sewage in the sewage discharge channel, and the stop check valve (5) is used to control the sewage to flow back to the filter body (1) through the sewage discharge circulation channel. The filter body (1) is provided with a filter screen (100) and a cleaning unit (200), the filter screen (100) is used to filter impurities in water, and the cleaning unit (200) is used to clean impurities on the filter screen (100); the filter body (1) is provided with a filter screen (100) and a cleaning unit (200). There is a sewage suction pipe (6), and the sewage suction pipe (6) is arranged at the center of the filter body (1); the cleaning unit (200) includes a strip scraper (61), a strip steel brush (62) and a strip suction nozzle (63) which are sequentially installed on the sewage suction pipe (6), and the strip scraper (61), the strip steel brush (62) and the strip suction nozzle (63) are spaced at an angle of α° from each other. The strip scraper (61) is used to scrape off larger impurities on the surface of the filter screen (100), the strip steel brush (62) is used to remove smaller impurities on the surface of the filter screen (100), and the strip suction nozzle (63) is used to The impurity-containing sewage on and near the surface of the filter screen (100) is adsorbed; a mounting bracket (60) is provided on the upper portion of the sewage suction pipe (6); the strip scraper (61), the strip steel brush (62) and the strip suction nozzle (63) are all arranged on the mounting bracket (60); and an elastic element (64) is provided between the strip scraper (61), the strip steel brush (62), the strip suction nozzle (63) and the mounting bracket (60); the elastic element (64) can control the distance between the strip scraper (61), the strip steel brush (62), the strip suction nozzle (63) and the filter screen (100); The filter body (1) is provided with a water inlet (11) at the bottom and a water outlet (12) at the top. The filter body (1) is also provided with a control box (7) and a pressure differential transmitter (8). The control box (7) is electrically connected to the motor (300), the pulverizer (2), the sewage pump (3) and the sewage valve (4) respectively. The pressure differential transmitter (8) is used to detect the pressure difference between the inside and outside of the filter screen (100). Step 1: The medium enters the interior of the filter body (1) through the water inlet pipe (11). If the differential pressure transmitter (8) measures X<Y, then the process proceeds to step 2; if the differential pressure transmitter (8) measures X≥Y and the timer (72) measures t>T, then the process proceeds to step 3; if the differential pressure transmitter (8) measures X≥Y and the timer (72) measures t<T, then the process proceeds to step 4; Step 2: The medium is filtered through the filter screen (100) and then discharged from the outlet pipe (12); Step 3: The control box (7) starts the sewage circulation channel, and the motor (300) rotates clockwise, driving the strip scraper (61) and the strip steel brush (62) on the sewage suction pipe (6) to operate, removing impurities on the surface of the filter (100), and sucking the sewage containing impurities into the sewage suction pipe (6) through the strip suction nozzle (63). Then, under the action of the sewage pump (3), the sewage containing impurities enters the grinder (2) through the sewage discharge pipe port (13) and is crushed and then returns to the filter body (1) through the stop check valve (5); if X < Y, then go to step 1; Step 4: The control box (7) starts the sewage discharge channel, and the motor (300) rotates clockwise, driving the strip scraper (61) and the strip steel brush (62) on the sewage suction pipe (6) to operate, removing impurities on the surface of the filter (100), and sucking the sewage containing impurities into the sewage suction pipe (6) through the strip suction nozzle (63). Then, under the action of the sewage pump (3), the sewage containing impurities enters the grinder (2) through the sewage discharge pipe port (13) and is crushed and discharged through the sewage valve (4); If X<Y, then go to step 1; wherein X is the detection value of the differential pressure transmitter (8), Y is the set value of the system, t is the time interval of the filter self-cleaning, and T is the set value of the system.

2. The self-cleaning filter according to claim 1, characterized in that The filter screen (100) is arranged on the upper part of the filter body (1), the cleaning unit (200) is arranged on the upper part of the sewage suction pipe (6), a motor (300) is arranged on the top of the filter body (1), the upper end of the sewage suction pipe (6) is connected to the drive shaft of the motor (300), and the lower end is installed at the bottom of the filter body (1), and the sewage suction pipe (6) is used to absorb sewage treated by the cleaning unit (200).

3. The self-cleaning filter according to claim 1, characterized in that The lower part of the filter body (1) is provided with a sewage return pipe opening (14), and the bottom is provided with a sewage discharge pipe opening (13). The water inlet pipe opening (11) is used to introduce sewage into the interior of the filter body (1), and the water outlet pipe opening (12) is used to discharge sewage filtered by the filter screen (100). The sewage discharge pipe opening (13) is connected to the lower end of the sewage suction pipe (6), the sewage return pipe opening (14) is connected to the stop check valve (5), and the sewage discharge pipe opening (13) is connected to the pulverizer (2).

4. The self-cleaning filter according to claim 1, characterized in that A control module (71) is provided in the control box (7), and the control module (71) is used to control the operating states of the motor (300), the pulverizer (2), the sewage pump (3), the sewage valve (4) and the stop check valve (5).

5. The self-cleaning filter according to claim 4, characterized in that The control module (71) controls the operating states of the motor (300), the pulverizer (2), the sewage pump (3), the sewage valve (4) and the stop check valve (5) according to the difference between X and Y.

6. The self-cleaning filter according to claim 5, characterized in that The filter body (1) is provided with a pressure gauge (9), and the pressure gauge (9) can display the pressure values ​​inside and outside the filter screen (100) in real time.

7. The self-cleaning filter according to claim 4, characterized in that A timer (72) is also provided in the control box (7), and the timer (72) is used to calculate the time t of the filter self-cleaning interval. The control module (71) controls the operating states of the motor (300), the grinder (2), the sewage pump (3), the sewage valve (4), and the stop check valve (5) according to the difference between t and T.

8. A control method based on the self-cleaning filter according to claim 1, characterized in that: Including steps: Step 1: The medium enters the interior of the filter body (1) through the water inlet pipe (11). If the differential pressure transmitter (8) measures X<Y, then the process proceeds to step 2; if the differential pressure transmitter (8) measures X≥Y and the timer (72) measures t>T, then the process proceeds to step 3; if the differential pressure transmitter (8) measures X≥Y and the timer (72) measures t<T, then the process proceeds to step 4; Step 2: The medium is filtered through the filter screen (100) and then discharged from the outlet pipe (12); Step 3: The control box (7) starts the sewage circulation channel, and the motor (300) rotates clockwise, driving the strip scraper (61) and the strip steel brush (62) on the sewage suction pipe (6) to operate, removing impurities on the surface of the filter (100), and sucking the sewage containing impurities into the sewage suction pipe (6) through the strip suction nozzle (63). Then, under the action of the sewage pump (3), the sewage containing impurities enters the grinder (2) through the sewage discharge pipe port (13) and is crushed and then returns to the filter body (1) through the stop check valve (5); if X < Y, then go to step 1; Step 4: The control box (7) starts the sewage discharge channel, and the motor (300) rotates clockwise, driving the strip scraper (61) and the strip steel brush (62) on the sewage suction pipe (6) to operate, removing impurities on the surface of the filter (100), and sucking the sewage containing impurities into the sewage suction pipe (6) through the strip suction nozzle (63). Then, under the action of the sewage pump (3), the sewage containing impurities enters the grinder (2) through the sewage discharge pipe port (13) and is crushed and discharged through the sewage valve (4); If X<Y, go to step 1.

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