Self-cleaning filter device with anti-blocking function

Abstract

The application discloses a self-cleaning filtering device with anti-blocking function, and relates to the technical field of filtering devices.The self-cleaning filtering device with anti-blocking function comprises a water inlet shell and a controller, the lower end of the water inlet shell is provided with a water outlet shell, a filter water inlet is formed in the water inlet shell, an upper three-way valve is installed on the filter water inlet, a filter water outlet is formed in the water outlet shell, a lower three-way valve is installed on the filter water outlet, and a self-cleaning assembly is arranged on the water outlet shell.Irrigation water is input into the filtering device from the filter water inlet through the upper three-way valve, when blockage occurs in the filtering device, a pressure difference is generated between the filter water inlet and the filter water outlet, the controller controls the self-cleaning assembly to perform internal self-cleaning by utilizing the pressure difference between the filter water inlet and the filter water outlet, no additional driving equipment is needed, the equipment energy efficiency and use conditions are reduced, and the applicability of field equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of filtration device technology, specifically a self-cleaning filtration device with anti-clogging function. Background Technology

[0002] Most existing self-cleaning mesh filters use a motor to drive the cleaning rod, which requires an external power source and consumes a lot of energy in order to achieve the self-cleaning function.

[0003] Meanwhile, existing self-cleaning net filters use either suction or scraping to clean impurities, which results in some impurities that cannot be suctioned or scraped off, thus failing to meet the needs of irrigation filters.

[0004] In addition, existing self-cleaning mesh filters can only be equipped with automatic cleaning rods for precision filters, while the inlet coarse filter still needs to be manually cleaned by inserting it into the outer shell, which reduces the efficiency of the equipment. At the same time, clogging of the coarse filter can also cause the inlet pressure to rise or fall, which can lead to misjudgment of the self-cleaning function of the precision filter and continuous cleaning, but the inlet and outlet cannot change. This will cause the equipment to continuously self-clean, affecting the water supply for subsequent irrigation. Summary of the Invention

[0005] The purpose of this invention is to provide a self-cleaning filter device with anti-clogging function to solve the problems mentioned in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The self-cleaning filter device with anti-clogging function includes an inlet shell, an electromagnetic head, and a controller. An outlet shell is installed at the lower end of the inlet shell. The inlet shell and the outlet shell are connected by a first clamp. A filter inlet is provided on the inlet shell, and an upper three-way valve is installed on the filter inlet. A filter outlet is provided on the outlet shell, and a lower three-way valve is installed on the filter outlet. A self-cleaning component is provided on the outlet shell. The self-cleaning component utilizes the pressure difference between the inlet and outlet of the filter device when it is clogged to provide driving force.

[0007] As a preferred technical solution, a coarse filter cylinder is installed on the water inlet shell, and a hydrophobic filter screen is installed at the lower end of the coarse filter cylinder. The hydrophobic filter screen is made of stainless steel, and an epoxy resin-based hydrophobic coating is added to the inner surface of the hydrophobic filter screen.

[0008] As a preferred technical solution, the specific formulation of the epoxy resin-based hydrophobic coating is as follows: 50wt% chlorinated solid microsphere PTFE resin, 30wt% silica nanoparticles; 10wt% triethylenetetramine curing agent, 5wt% glycerol triglycidyl ether reactive diluent; and 5% acetone solvent.

[0009] As a preferred technical solution, a flushing valve is installed on the upper end of the water inlet shell. The upper three-way valve is provided with an upper three-way valve inlet, an upper three-way valve first outlet, and an upper three-way valve second outlet. The lower three-way valve is provided with a lower three-way valve inlet, a lower three-way valve first outlet, and a lower three-way valve second outlet. The flushing valve, the upper three-way valve, and the lower three-way valve are all electrically connected to the controller.

[0010] As a preferred technical solution, the self-cleaning component includes a piston cylinder, a scraper and a brush head nozzle, a suction port, a centrifugal disc, a centrifugal disc connecting rod, a piston cylinder piston, a piston connecting rod, and a suction rod;

[0011] A backwash chamber is installed at the lower end of the water outlet shell. The backwash chamber is connected to the water outlet shell by a second clamp. A piston cylinder is installed at the lower end of the backwash chamber. A piston connecting rod is installed inside the piston cylinder. A piston cylinder piston is installed at the end of the piston connecting rod. A centrifugal disc connecting rod is installed on the piston cylinder piston. A centrifugal disc is installed at the end of the centrifugal disc connecting rod. A suction rod is installed on the centrifugal disc. Several sets of scrapers, brush nozzles, and suction pipes are installed on the suction rod.

[0012] As a preferred technical solution, the suction rod is evenly distributed with several sets of scrapers, brush heads, and suction pipes, and the distribution of the scrapers, brush heads, and suction pipes divides the filter screen equally.

[0013] As a preferred technical solution, the centrifugal disc is provided with a plurality of centrifugal disc outlets, and the opening direction of the centrifugal disc outlets is tangent to the side of the centrifugal disc.

[0014] As a preferred technical solution, the self-cleaning component further includes a drain pipe, which is installed on the water outlet shell. A drain bend is installed on the drain pipe, and a drain outlet is located on the side of the drain bend away from the drain pipe. The drain bend is nested inside the drain pipe, and a push chamber drain outlet is provided at the end of the drain pipe away from the drain bend. A drain push rod is slidably installed inside the drain pipe, and the drain push rod is connected to the drain pipe by a spring. The end of the drain push rod near the drain bend is a push rod sealing cone surface, and a drain inlet valve is installed on the side of the drain pipe away from the water outlet shell.

[0015] As a preferred technical solution, a lifting valve is installed at the end of the piston cylinder away from the water outlet shell.

[0016] As a preferred technical solution, the electromagnetic head is electrically connected to the controller, and the electromagnetic head is connected to the upper three-way valve, the sewage inlet valve and the lifting valve through a flexible hose. The flexible hose connecting the lifting valve and the electromagnetic head is connected to the drain port of the push chamber.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. Through two stages of filtration, namely coarse filtration and fine filtration, the filtration efficiency and purification level are effectively improved. At the same time, the hydrophobic coating on the hydrophobic filter screen makes it difficult for impurities to adhere to the filter screen, making it easy to clean.

[0019] 2. Flushing cleaning can perform simple cleaning of the filter device. When the controller detects that the pressure difference has returned to normal, filtration can continue. When the pressure difference is maintained above the set value, the controller controls the self-cleaning component to perform deep cleaning. The combination of the two cleaning methods reduces the frequency of self-cleaning. Self-cleaning can be performed only when needed, which can effectively improve filtration efficiency and extend the service life of the device.

[0020] 3. All the scrapers, brush heads, and suction pipes on the suction rod rotate and move upwards. One cycle will cover the entire area of ​​the filter screen, achieving a self-priming effect to remove impurities. Through this hydraulic drive, the water pressure when the filter is clogged drives the suction rod to move and suck up dirt, thereby reducing equipment energy efficiency and operating conditions, and improving the applicability of the equipment in the field. Attached Figure Description

[0021] Figure 1 This is a first-view structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the second perspective structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the third-view structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the first cross-sectional structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the second cross-sectional structure of the present invention and a schematic diagram of the water flow direction during filtration;

[0026] Figure 6 This is a schematic diagram of the water flow direction during self-cleaning according to the present invention;

[0027] Figure 7 This is a schematic diagram of the third cross-sectional structure of the present invention.

[0028] In the diagram: 1. Inlet housing; 2. Outlet housing; 3. Backwash chamber; 4. Piston cylinder; 5. First clamp; 6. Second clamp; 7. Upper three-way valve; 8. Filter inlet; 9. Filter outlet; 10. Upper three-way valve inlet; 11. Upper three-way valve first outlet; 12. Upper three-way valve second outlet; 13. Solenoid head; 14. Controller; 15. Flushing valve; 16. Drain outlet; 17. Coarse filter cartridge; 18. Hydrophobic filter screen; 19. Scraper and brush nozzle; 20. Drain installation. 21. Pipe; 22. Centrifuge disc; 23. Centrifuge disc connecting rod; 24. Piston cylinder piston; 25. Piston connecting rod; 26. Suction rod; 27. Centrifuge disc centrifuge outlet; 28. Lower three-way valve; 29. ​​Sewage drain bend; 30. Push chamber drain outlet; 31. Sewage push rod; 32. Spring; 33. Push rod sealing cone surface; 34. Sewage inlet valve; 35. Lower three-way valve inlet; 36. Lower three-way valve first outlet; 37. Lower three-way valve second outlet; 38. Suction pipe; 39. Lifting valve. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example: Figures 1-6 As shown, the present invention provides a technical solution for a self-cleaning filter device with anti-clogging function. The self-cleaning filter device with anti-clogging function includes an inlet housing 1 and a controller 14. An outlet housing 2 is installed at the lower end of the inlet housing 1. The inlet housing 1 and the outlet housing 2 are connected by a first clamp 5. A filter inlet 8 is provided on the inlet housing 1. An upper three-way valve 7 is installed on the filter inlet 8. A filter outlet 9 is provided on the outlet housing 2. A lower three-way valve 27 is installed on the filter outlet 9. A self-cleaning component is provided on the outlet housing 2. The self-cleaning component uses the pressure difference between the inlet and outlet of the filter device when it is clogged to provide driving force.

[0031] When this self-cleaning filter with anti-clogging function is filtering, irrigation water enters the filter through the upper three-way valve 7 from the filter inlet 8. When the filter becomes clogged, a pressure difference is generated between the filter inlet 8 and the filter outlet 9. After the controller 14 detects the pressure difference, it controls the self-cleaning component to perform internal self-cleaning by utilizing the pressure difference between the filter inlet 8 and the filter outlet 9. It relies on the water pressure of the irrigation system to achieve the function of suction and discharge of sewage, without the need for additional drive equipment, reducing equipment energy efficiency and operating conditions, and improving the applicability of field equipment.

[0032] like Figures 2-6 As shown, a coarse filter cylinder 17 is installed on the water inlet housing 1, and a hydrophobic filter screen 18 is installed at the lower end of the coarse filter cylinder 17. The hydrophobic filter screen 18 is made of stainless steel, and an epoxy resin-based hydrophobic coating is added to the inner surface of the hydrophobic filter screen 18.

[0033] The specific formulation of the epoxy resin-based hydrophobic coating is as follows: 50wt% chlorinated solid microsphere PTFE resin, 30wt% silica nanoparticles; 10wt% triethylenetetramine curing agent, 5wt% glycerol triglycidyl ether reactive diluent; and 5% acetone solvent.

[0034] Irrigation water first undergoes coarse filtration through coarse filter cartridge 17, where impurities larger than the coarse filtration precision are blocked. Other water continues to enter and reaches hydrophobic filter screen 18, where impurities larger than the filtration precision cannot pass through the filter screen and form a filter cake inside the filter screen. Through coarse filtration and fine filtration, the filtration efficiency and purification level are effectively improved. At the same time, the inner surface of the hydrophobic filter screen 18 adopts a unique hydrophobic formula, which makes it difficult for filtered impurities to adhere to the filter screen and easy to clean.

[0035] like Figure 1 and Figures 4-6 As shown, a flushing valve 15 is installed on the upper end of the water inlet housing 1. The upper three-way valve 7 is provided with an upper three-way valve inlet 10, an upper three-way valve first outlet 11 and an upper three-way valve second outlet 12. The lower three-way valve 27 is provided with a lower three-way valve inlet 34, a lower three-way valve first outlet 35 and a lower three-way valve second outlet 36. The flushing valve 15, the upper three-way valve 7 and the lower three-way valve 27 are all electrically connected to the controller 14.

[0036] When the controller 14 detects that the pressure difference between the filter inlet 8 and the filter outlet 9 reaches the set value, the filter device performs a simple self-cleaning of the coarse filter cartridge 17. At this time, the upper three-way valve inlet 10 and the upper three-way valve second outlet 12 are connected, the upper three-way valve first outlet 11 is closed, the lower three-way valve inlet 34 and the lower three-way valve second outlet 36 are connected, the lower three-way valve first outlet 35 is closed, the flushing valve 15 is opened, water enters from the filter outlet 9 to flush the coarse filter screen, and impurities flow out from the flushing valve 15. The flushing cleaning can perform a simple cleaning of the filter device. When the controller 14 detects that the pressure difference has returned to normal, filtration can continue. When the pressure difference is maintained above the set value, the controller 14 controls the self-cleaning component to perform deep cleaning. The combination of the two cleaning methods reduces the frequency of self-cleaning. Self-cleaning is only performed when needed, which can effectively improve filtration efficiency and extend the service life of the device.

[0037] like Figures 4-6As shown, the self-cleaning assembly includes a piston cylinder 4, a scraper and brush head nozzle 19, a suction pipe 37, a centrifugal disc 21, a centrifugal disc connecting rod 22, a piston cylinder piston 23, a piston connecting rod 24, and a suction rod 25.

[0038] A backwash chamber 3 is installed at the lower end of the water outlet shell 2. The backwash chamber 3 is connected to the water outlet shell 2 by a second clamp 6. A piston cylinder 4 is installed at the lower end of the backwash chamber 3. A piston connecting rod 24 is installed inside the piston cylinder 4. A piston cylinder piston 23 is installed at the end of the piston connecting rod 24. A centrifugal disc connecting rod 22 is installed on the piston cylinder piston 23. A centrifugal disc 21 is installed at the end of the centrifugal disc connecting rod 22. A suction rod 25 is installed on the centrifugal disc 21. Several sets of scrapers, brush nozzles 19, and suction pipes 37 are installed on the suction rod 25.

[0039] The suction rod 25 is evenly distributed with several sets of scrapers, brush heads 19 and suction pipes 37, and the distribution of the scrapers, brush heads 19 and suction pipes 37 divides the hydrophobic filter screen 18 into equal parts.

[0040] The centrifuge disc 21 has several centrifuge outlets 26, and the opening direction of the centrifuge outlets 26 is tangent to the side of the centrifuge disc 21.

[0041] The centrifugal outlet 26 of the centrifugal disc is designed to ensure that when water flows into the suction rod 25 and is discharged from the centrifugal outlet 26, centrifugal force is generated to drive the centrifugal disc 21 to rotate. When the centrifugal disc 21 rotates, it drives the scraper, brush head nozzle 19 and suction pipe 37 to rotate synchronously through the suction rod 25. At this time, the scraper, brush head nozzle 19 and suction pipe 37 can scrape and suck out the filter cake formed in the hydrophobic filter screen 18, clean the hydrophobic filter screen 18, ensure that the filtration device works continuously and efficiently, and improve the filtration efficiency.

[0042] like Figures 4-7 As shown, the self-cleaning component also includes a drain pipe 20. The drain pipe 20 is installed on the water outlet shell 2, and a drain bend 28 is installed on the drain pipe 20. The drain bend 28 has a drain port 16 on the side away from the drain pipe 20. The drain bend 28 is nested inside the drain pipe 20. The end of the drain pipe 20 away from the drain bend 28 is provided with a push chamber drain port 29. A drain push rod 30 is slidably installed inside the drain pipe 20. The drain push rod 30 is connected to the drain pipe 20 by a spring 31. The end of the drain push rod 30 near the drain bend 28 is a push rod sealing cone surface 32. A drain inlet valve 33 is installed on the side of the drain pipe 20 away from the water outlet shell 2.

[0043] In the initial state, the push rod sealing cone 32 is pressed against the end of the drain bend 28. At this time, the inside of the drain installation pipe 20 is connected to the inside of the filter device but not to the atmosphere. When self-cleaning is required, the controller 14 controls the solenoid head 13 to open the drain inlet valve 33. The water entering the drain inlet valve 33 pushes the spring 31 and the drain push rod 30 to move towards the drain outlet 29 of the push chamber. At this time, the push rod sealing cone 32 separates from the end of the drain bend 28. The inside of the filter device is connected to the atmospheric pressure through the drain outlet 16. The water flow discharged from the centrifugal outlet 26 of the centrifugal disc carries the impurities sucked out by the suction pipe 37 and is discharged to the outside through the drain outlet 16, realizing the external discharge of impurities and ensuring the internal cleanliness of the filter device. At the same time, due to the pressure difference inside the filter device, after the drain installation pipe 20 is connected to the outside, a vacuum negative pressure will be formed, which promotes the water flow from the centrifugal outlet 26 of the centrifugal disc, ensuring the rotation of the centrifugal disc 21 and realizing the removal of the filter cake on the hydrophobic filter screen 18.

[0044] A lifting valve 38 is installed at the end of the piston cylinder 4 away from the water outlet casing 2.

[0045] At the same time, the controller 14 controls the electromagnetic head 13 to open the lifting valve 38, and the centrifugal disc 21 rotates to inject water into the piston cylinder 4, pushing the piston cylinder piston 23 to drive the suction rod 25 to move upward. The centrifugal disc 21 can rotate and move upward at the same time, driving all the scrapers, brush heads 19 and suction pipes 37 on the suction rod 25 to rotate and move upward synchronously 360 degrees. This forms a process where one brushing covers the entire area of ​​the filter screen in one cycle, achieving a comprehensive cleaning of the hydrophobic filter screen 18.

[0046] The electromagnetic head 13 is electrically connected to the controller 14. The electromagnetic head 13 is connected to the upper three-way valve 7, the sewage inlet valve 33 and the lifting valve 38 through a hose. The hose connecting the lifting valve 38 and the electromagnetic head 13 is connected to the drain port 29 of the push chamber.

[0047] Working principle of the invention:

[0048] Irrigation water enters the filter through the filter inlet 8. The upper three-way valve inlet 10 and the first outlet 11 of the upper three-way valve 7 are connected. The water undergoes the first coarse filtration through the coarse filter cylinder 17. Impurities larger than the coarse filtration precision are blocked outside. Other water continues to enter and reaches the hydrophobic precision filter screen 18. Impurities larger than the filtration precision cannot pass through the filter screen and form a filter cake inside the filter screen. Clean water flows out from the filter outlet 9 and is discharged through the lower three-way valve inlet 34 and the first outlet 35 of the lower three-way valve 27, completing the filtration. Through the two-stage filtration of coarse and fine filtration, the filtration efficiency and purification level are effectively improved.

[0049] When the pressure difference reaches the set value, the filter device performs a simple self-cleaning of the coarse filter cartridge 17. At this time, the inlet 10 and the second outlet 12 of the upper three-way valve are connected, the first outlet 11 of the upper three-way valve is closed, the inlet 34 and the second outlet 36 of the lower three-way valve are connected, the first outlet 35 of the lower three-way valve is closed, the flushing valve 15 is opened, and water enters from the filter outlet 9 to flush the coarse filter screen. Impurities flow out from the flushing valve 15. After flushing, self-cleaning or restoration of the filtration state is performed. Flushing can clean the coarse filter cartridge 17 and improve the filtration efficiency.

[0050] When the filter screen intercepts impurities to a certain extent, its flow rate will decrease. At this time, the controller 14 detects that the pressure difference between the filter inlet 8 and the filter outlet 9 has reached the set value. The controller 14 controls the solenoid head 13 to open the drain inlet valve 33. The water entering the drain inlet valve 33 pushes the spring 31 and the drain push rod 30 to move towards the drain outlet 29 of the push chamber. At this time, the sealing cone surface 32 of the push rod separates from the end of the drain bend 28. The filter device is connected to atmospheric pressure through the drain outlet 16. At this time, the unfiltered water in the hydrophobic filter screen 18 is pressed into the suction rod 25 by the pressure difference and sprayed out from the centrifugal outlet 26 of the centrifugal disc. Since the opening direction of the centrifugal outlet 26 of the centrifugal disc is tangent to the side of the centrifugal disc 21, centrifugal force is generated when the filter is sprayed out, which drives the centrifugal disc 21 to rotate. The centrifugal disc 21 drives the scraper, brush head nozzle 19 and suction pipe 37 through the suction rod 25 to scrape and suck out the filter cake on the hydrophobic filter screen 18.

[0051] Simultaneously, the controller 14 controls the electromagnetic head 13 to open the lifting valve 38, and water is injected into the piston cylinder 4 as the centrifugal disc 21 rotates, pushing the piston cylinder piston 23 to move the suction rod 25 upward. The centrifugal disc 21 can rotate and move upward at the same time, driving all the scrapers, brush heads 19 and suction pipes 37 on the suction rod 25 to rotate and move upward synchronously 360 degrees. One cycle will cover the entire area of ​​the filter screen, achieving the effect of self-priming to remove impurities. When the set running time ends, all equipment resets, and the suction rod returns to its original position, waiting for the next run. Through this hydraulic drive, relying on the water pressure when the filter is clogged, the hydraulic drive of the suction rod 25 is used to move and suck up dirt, thereby reducing the energy efficiency and operating conditions of the equipment and improving the applicability of the field equipment.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A self-cleaning filter device with anti-clogging function, characterized in that: The self-cleaning filter device comprises a water inlet shell (1), an electromagnetic head (13) and a controller (14), the lower end of the water inlet shell (1) is provided with a water outlet shell (2), the water inlet shell (1) and the water outlet shell (2) are connected through a first clamp (5), a filter water inlet (8) is formed in the water inlet shell (1), the filter water inlet (8) is provided with an upper three-way valve (7), a filter water outlet (9) is formed in the water outlet shell (2), the filter water outlet (9) is provided with a lower three-way valve (27), the water outlet shell (2) is provided with a self-cleaning assembly, the self-cleaning assembly utilizes the pressure difference at the filter device water inlet and water outlet when blocked to provide driving force; The upper end of the water inlet shell (1) is provided with a flushing valve (15), the upper three-way valve (7) is provided with an upper three-way valve water inlet (10), an upper three-way valve first water outlet (11) and an upper three-way valve second water outlet (12), the lower three-way valve (27) is provided with a lower three-way valve water inlet (34), a lower three-way valve first water outlet (35) and a lower three-way valve second water outlet (36), the flushing valve (15), the upper three-way valve (7) and the lower three-way valve (27) are electrically connected with the controller (14); The self-cleaning assembly comprises a piston cylinder (4), a scraper and a brush head nozzle (19), a sewage suction pipe (37), a centrifugal disc (21), a centrifugal disc connecting rod (22), a piston cylinder piston (23), a piston connecting rod (24) and a sewage suction rod (25), the piston cylinder (4) is provided with a lifting valve (38) at the end away from the water outlet shell (2). The self-cleaning assembly further comprises a sewage discharge mounting pipe (20), the water outlet shell (2) is provided with the sewage discharge mounting pipe (20), the sewage discharge mounting pipe (20) is provided with a sewage discharge elbow (28), the sewage discharge elbow (28) is provided with a sewage discharge opening (16) at the side away from the sewage discharge mounting pipe (20), the sewage discharge elbow (28) is nested in the sewage discharge mounting pipe (20), the sewage discharge mounting pipe (20) is provided with a push cavity water outlet (29) at the end away from the sewage discharge elbow (28), the sewage discharge mounting pipe (20) is slidably provided with a sewage discharge push rod (30), the sewage discharge push rod (30) is connected with the sewage discharge mounting pipe (20) through a spring (31), the sewage discharge push rod (30) is provided with a push rod sealing conical surface (32) at the end close to the sewage discharge elbow (28), and the sewage discharge mounting pipe (20) is provided with a sewage discharge water inlet valve (33) at the side away from the water outlet shell (2).

2. The self-cleaning filter device with anti-blocking function according to claim 1, characterized in that: The water inlet shell (1) is provided with a coarse filter cylinder (17), the lower end of the coarse filter cylinder (17) is provided with a hydrophobic filter screen (18), the hydrophobic filter screen (18) is made of stainless steel, and an epoxy resin-based hydrophobic coating is added to the inner surface of the hydrophobic filter screen (18).

3. The self-cleaning filter device with anti-blocking function according to claim 2, characterized in that: The specific formula of the epoxy resin-based hydrophobic coating is: 50wt% of chlorinated solid microsphere PTFE resin, 30wt% of silicon dioxide nanoparticles, 10wt% of triethylenetetramine curing agent, 5wt% of glycerol triglycidyl ether active diluent and 5% of acetone solvent.

4. The self-cleaning filter device with anti-blocking function according to claim 1, characterized in that: The lower end of the water outlet shell (2) is provided with a backwashing cavity (3), the backwashing cavity (3) is connected with the water outlet shell (2) through a second clamp (6), the lower end of the backwashing cavity (3) is provided with a piston cylinder (4), the piston cylinder (4) is provided with a piston connecting rod (24) inside, the end of the piston connecting rod (24) is provided with a piston cylinder piston (23), the piston cylinder piston (23) is provided with a centrifugal disc connecting rod (22), the end of the centrifugal disc connecting rod (22) is provided with a centrifugal disc (21), the centrifugal disc (21) is provided with a dirt sucking rod (25), the dirt sucking rod (25) is provided with a plurality of groups of scraper and brush head nozzles (19) and dirt sucking pipes (37).

5. The self-cleaning filter device with anti-blocking function according to claim 4, characterized in that: The dirt sucking rod (25) is provided with a plurality of groups of scraper and brush head nozzles (19) and dirt sucking pipes (37) uniformly distributed, the distribution of the scraper and brush head nozzles (19) and dirt sucking pipes (37) divides the hydrophobic filter screen (18) into two equal parts.

6. The self-cleaning filter device with anti-blocking function according to claim 4, characterized in that: The centrifugal disc (21) is provided with a plurality of centrifugal disc centrifugal water outlets (26), the opening direction of the centrifugal disc centrifugal water outlets (26) is tangent to the side surface of the centrifugal disc (21).

7. The self-cleaning filter device with anti-blocking function according to claim 6, characterized in that: The electromagnetic head (13) is electrically connected with the controller (14), the electromagnetic head (13) is connected with the upper three-way valve (7), the dirt discharging water inlet valve (33) and the lifting valve (38) through a hose, the hose connecting the lifting valve (38) and the electromagnetic head (13) is connected with the push cavity water outlet (29).

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