Anti-blocking plunger valve and using method thereof

Abstract

The invention discloses an anti-blocking plunger valve and a using method thereof, and relates to the technical field of plunger valves. The anti-blocking plunger valve comprises a valve body, a main circulation flow channel arranged in the valve body, a valve seat installed in the flow channel, a plunger main body matched with the valve seat to achieve opening and closing and a valve rod driving the plunger main body to move, a filtering assembly is arranged on the flow channel, a cleaning unit is further arranged in a filtering seat, and a backwashing structure is arranged on the filtering seat. According to the anti-blocking plunger valve, the unique filtering and cleaning mechanism is integrated in the flow channel, so that the problem of blockage caused by impurities is effectively solved. The filter screen can actively intercept solid particles, and the innovative fluid-driven cleaning unit can automatically rotate a scraper blade by means of the energy of backwashing fluid under the condition of not depending on external power, so that attached impurities are thoroughly removed, the filtering effect and the reliability of the action of the valve core are ensured, and the valve fault caused by blockage is fundamentally avoided.

Description

Technical Field

[0001] This invention relates to the field of plunger valve technology, specifically to an anti-clogging plunger valve and its usage method. Background Technology

[0002] As an important fluid control device, the plunger valve is widely used in fluid pipeline systems in industries such as petroleum, chemical, and pharmaceutical due to its excellent sealing performance and long service life. It is used to cut off or regulate the flow of media. Its core working principle is to open and close the flow channel through the tight fit between the plunger body and the valve seat.

[0003] However, when the pipeline medium contains solid particulate impurities, these impurities easily accumulate in the flow channel, especially in the sealing area between the valve seat and the plunger. The accumulation of impurities not only exacerbates the wear of the sealing elements, leading to internal leakage in the valve, but can also directly jam between the plunger and the valve seat, preventing the valve from fully closing or opening, resulting in serious consequences such as system malfunction and production stoppage. In existing technologies, a separate filter is usually installed upstream of the valve to intercept impurities; however, this filter requires regular manual cleaning, which is cumbersome and time-consuming. Furthermore, if the filter becomes clogged and is not cleaned in time, it will cause a decrease in system flow, also affecting normal production processes. Therefore, to address the shortcomings of existing technologies, this invention provides an anti-clogging plunger valve and its usage method to solve the above problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an anti-clogging plunger valve and its usage method. By integrating a unique filtration and cleaning mechanism within the flow channel, it effectively solves the problem of impurity clogging. The filter screen actively intercepts solid particles, while the innovative fluid-driven cleaning unit automatically rotates the scraper using the energy of the backwash fluid without relying on external power, thoroughly removing attached impurities. This ensures the filtration effect and the reliability of the valve core's operation, fundamentally preventing valve malfunctions caused by clogging.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: an anti-clogging plunger valve, comprising a valve body, a main flow channel disposed within the valve body, a valve seat installed in the flow channel, a plunger body cooperating with the valve seat to realize opening and closing, and a valve stem driving the plunger body to move, wherein a filter assembly is disposed on the flow channel for intercepting solid particles in the medium;

[0006] The filter assembly includes a filter base and a filter screen disposed inside the filter base;

[0007] The filter seat is also equipped with a cleaning unit, which includes a rotatable cleaning scraper and a turbine body connected to the cleaning scraper. The cleaning scraper is in contact with the inner surface of the filter screen.

[0008] The filter base is equipped with a backwashing structure, the outlet of which faces the turbine body. This structure is used to drive the cleaning unit by the impact force of the backwashing fluid, thereby rotating the cleaning scraper to remove impurities from the filter screen.

[0009] Preferably, the cleaning unit further includes a turbine mount, a first bevel gear, and a second bevel gear for mounting the turbine body;

[0010] The turbine seat is fixedly disposed on the side of the filter seat, and an accommodating cavity is formed inside it;

[0011] The turbine body is rotatably disposed within the receiving cavity of the turbine seat, with its blades facing the outlet of the backwashing structure to receive the impact of the fluid;

[0012] The turbine body's rotating shaft is coaxially connected to the first bevel gear;

[0013] The first bevel gear and the second bevel gear mesh with each other to form a reversing transmission mechanism;

[0014] The shaft of the second bevel gear is fixedly connected to the cleaning scraper.

[0015] Preferably, the backwashing structure further includes a backwashing outlet pipe and a second solenoid valve;

[0016] One end of the backwash outlet pipe is fixedly mounted on the filter seat, and the other end passes through the turbine seat and communicates with the internal accommodating cavity of the turbine seat;

[0017] The second solenoid valve is installed on the backwash outlet pipe and is used to control the on / off state of the backwash structure.

[0018] Preferably, the filter assembly further includes a guide rail and a cap;

[0019] The filter screen is detachably installed inside the filter base via the rail;

[0020] The cover is detachably mounted on the filter base to close the filter base for maintenance or replacement of the filter screen.

[0021] Preferably, a first solenoid valve is also provided on the flow channel, and the first solenoid valve is located upstream of the filter assembly.

[0022] Preferably, the plunger valve further includes a controller, a flow rate sensor, and an alarm;

[0023] The flow velocity sensor is installed on the flow channel to detect the flow velocity of the medium and transmit the signal to the controller;

[0024] The controller is electrically connected to the first solenoid valve, the second solenoid valve, and the alarm.

[0025] Preferably, the controller is configured as follows:

[0026] Receives flow velocity signals from flow velocity sensors;

[0027] When the flow rate is lower than the first preset threshold, the first solenoid valve is controlled to reduce its opening or close, while the second solenoid valve is controlled to open, thus initiating the backwashing process.

[0028] After the backwashing process has lasted for a preset time, the second solenoid valve is closed, and the first solenoid valve is restored to its normal opening.

[0029] Preferably, the controller is further configured to: if, after the backwashing process is started, the flow rate value detected by the flow rate sensor remains lower than a second preset threshold that is lower than a first preset threshold, then control the alarm to issue an alarm, prompting that manual maintenance is required.

[0030] Preferably, the cleaning scraper is made of a flexible material, and its edges maintain elastic contact with the inner surface of the filter screen.

[0031] The second aspect of the present invention discloses a method of using an anti-clogging plunger valve, the method comprising the following steps: Step S1: Real-time monitoring of the medium flow rate in the flow channel using a flow rate sensor;

[0032] Step S2: The controller determines whether the flow rate is lower than the first preset threshold;

[0033] Step S3: If the flow rate is lower than the first preset threshold, the controller outputs a control signal, first adjusting the first solenoid valve to reduce or cut off the main flow, and then opening the second solenoid valve;

[0034] Step S4: The high-pressure backwash fluid passes through the flow channel and the filter seat to backwash the filter screen. At the same time, the high-pressure backwash fluid impacts the turbine body through the backwash structure, driving it to rotate. Through the meshing transmission of the first bevel gear and the second bevel gear, it drives the cleaning scraper to rotate and scrape the inner wall of the filter screen.

[0035] Step S5: The scraped-off impurities are discharged from the valve along with the backwash fluid through the turbine seat and backwash outlet pipe;

[0036] Step S6: After backwashing continues for a predetermined time, the controller closes the second solenoid valve and restores the first solenoid valve to its normal opening, and the system returns to normal filtration operation.

[0037] The technical effects and advantages of this invention are as follows:

[0038] 1. This anti-clogging plunger valve effectively solves the problem of impurity blockage by integrating a unique filtration and cleaning mechanism within the flow channel. The filter screen actively intercepts solid particles, while the innovative fluid-driven cleaning unit automatically rotates the scraper using the energy of the backwash fluid without relying on external power, thoroughly removing attached impurities. This ensures the filtration effect and the reliability of the valve core operation, fundamentally preventing valve failure caused by blockage.

[0039] 2. This anti-clogging plunger valve, through the installation of a flow rate sensor and controller, enables the system to monitor the flow channel status in real time and intelligently determine the degree of blockage. The controller can automatically trigger and manage the entire backwashing process, including the regulation of the main fluid and the opening and closing of the backwash valve, realizing fully automated online cleaning and status recovery, greatly reducing manual intervention and improving the intelligence level and operating efficiency of the equipment.

[0040] 3. This anti-clogging plunger valve features a removable, rail-mounted filter screen with an openable cover. When automatic cleaning fails to handle extreme clogging, manual cleaning or replacement is easily performed, significantly reducing maintenance difficulty and time costs. This dual maintenance mechanism significantly improves the overall availability and reliability of the valve system. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0043] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0044] Figure 3 This is a schematic diagram of the structure of the filter assembly of the present invention;

[0045] Figure 4 This is a schematic diagram of the backwashing structure of the present invention;

[0046] Figure 5 This is a disassembly diagram of the cap of the present invention;

[0047] Figure 6 This is a schematic diagram of the installation of the filter screen of the present invention;

[0048] Figure 7 This is a disassembly diagram of the filter screen of the present invention;

[0049] Figure 8 This is a cross-sectional schematic diagram of the turbine mount of the present invention;

[0050] Figure 9 This is a schematic diagram of the cleaning unit of the present invention.

[0051] In the diagram: 1. Valve body; 2. Flow channel; 21. First solenoid valve; 3. Valve seat; 4. Plunger body; 5. Valve stem; 6. Filter assembly; 61. Filter seat; 62. Rail; 63. Filter screen; 64. Cover; 7. Backwashing structure; 71. Backwashing outlet pipe; 72. Second solenoid valve; 8. Cleaning unit; 81. Turbine seat; 82. Turbine body; 83. First bevel gear; 84. Cleaning scraper; 85. Second bevel gear; 9. Controller; 91. Flow rate sensor; 92. Alarm. Detailed Implementation

[0052] 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.

[0053] This embodiment discloses an anti-clogging plunger valve, according to the appendix... Figure 1 To be continued Figure 9 As shown, it includes a valve body 1, a main flow channel 2 disposed in the valve body 1, a valve seat 3 installed in the flow channel 2, a plunger body 4 that cooperates with the valve seat 3 to realize opening and closing, and a valve stem 5 that drives the plunger body 4 to move. A filter assembly 6 is disposed on the flow channel 2. The filter assembly 6 includes a filter seat 61, a filter screen 63 disposed inside the filter seat 61, a cleaning unit 8 disposed inside the filter seat 61, and a backwashing structure 7 disposed on the filter seat 61.

[0054] According to the appendix Figure 8 To be continued Figure 9 As shown, the cleaning unit 8 further includes a turbine seat 81 for mounting the turbine body 82, a first bevel gear 83, a second bevel gear 85, and a rotatable cleaning scraper 84. The turbine seat 81 is fixedly disposed on the side of the filter seat 61, and a receiving cavity is formed inside it. The turbine body 82 is rotatably disposed in the receiving cavity of the turbine seat 81, and its blades face the outlet of the backwash structure 7 to receive the impact of the fluid. The rotating shaft of the turbine body 82 is coaxially connected to the first bevel gear 83. The first bevel gear 83 and the second bevel gear 85 mesh with each other to form a reversing transmission mechanism. The rotating shaft of the second bevel gear 85 is fixedly connected to the cleaning scraper 84. The rotation of the turbine body 82 drives the bevel gear transmission, thereby realizing the rotation of the cleaning scraper 84.

[0055] According to the appendix Figure 4 As shown, the backwashing structure 7 further includes a backwashing outlet pipe 71 and a second solenoid valve 72. One end of the backwashing outlet pipe 71 is fixedly mounted on the filter seat 61, and the other end passes through the turbine seat 81 and communicates with the internal cavity of the turbine seat 81. The second solenoid valve 72 is mounted on the backwashing outlet pipe 71 and is used to control the opening and closing of the backwashing structure 7. The flow and cut-off of the backwashing fluid can be precisely controlled by opening and closing the second solenoid valve 72.

[0056] According to the appendix Figure 5 To be continued Figure 7 As shown, the filter assembly 6 further includes a retaining rail 62 and a cover 64. The filter screen 63 is detachably installed inside the filter base 61 via the retaining rail 62. The cover 64 is openably mounted on the filter base 61. When the filter screen 63 needs to be maintained or replaced, the cover 64 can be opened to remove the filter screen 63 along the retaining rail 62, making the operation convenient.

[0057] According to the appendix Figure 1 To be continued Figure 2 As shown, a first solenoid valve 21 is also provided on the flow channel 2. The first solenoid valve 21 is located upstream of the filter assembly 6. The plunger valve also includes a controller 9, a flow rate sensor 91 and an alarm 92. The flow rate sensor 91 is provided on the flow channel 2 and is used to detect the medium flow rate and transmit the signal to the controller 9. The controller 9 is electrically connected to the first solenoid valve 21, the second solenoid valve 72 and the alarm 92 to form an automated control system.

[0058] According to the appendix Figure 1 To be continued Figure 9 As shown, it is particularly important to emphasize that the controller 9 is configured to receive the flow rate signal from the flow rate sensor 91. When the flow rate value is lower than the first preset threshold, the controller controls the first solenoid valve 21 to reduce its opening or close it, and at the same time controls the second solenoid valve 72 to open to start the backwashing process. After the backwashing process has lasted for a preset time, the controller controls the second solenoid valve 72 to close and controls the first solenoid valve 21 to return to its normal opening, thereby realizing the automated operation of backwashing.

[0059] According to the appendix Figure 1 To be continued Figure 9 As shown, it is particularly important to emphasize that the controller 9 is also configured to control the alarm 92 to sound an alarm if the flow rate value detected by the flow rate sensor 91 continues to be lower than the second preset threshold which is lower than the first preset threshold after the backwashing process is started, so as to prompt that manual maintenance is required. At the same time, the cleaning scraper 84 is made of flexible material and its edge maintains elastic contact with the inner surface of the filter screen 63, which can avoid scratching the filter screen 63 while cleaning impurities.

[0060] The second aspect of the present invention discloses a method of using an anti-clogging plunger valve, the method comprising the following steps: Step S1: Real-time monitoring of the medium flow rate in the flow channel 2 by means of a flow rate sensor 91;

[0061] Step S2: Controller 9 determines whether the flow rate is lower than the first preset threshold;

[0062] Step S3: If the flow rate is lower than the first preset threshold, the controller 9 outputs a control signal, first adjusting the first solenoid valve 21 to reduce or cut off the main flow, and then opening the second solenoid valve 72.

[0063] Step S4: The high-pressure backwash fluid passes through the flow channel 2 and the filter seat 61 to backwash the filter screen 63. At the same time, the high-pressure backwash fluid impacts the turbine body 82 through the backwash structure 7, driving it to rotate. Through the meshing transmission of the first bevel gear 83 and the second bevel gear 85, it drives the cleaning scraper 84 to rotate and scrape the inner wall of the filter screen 63.

[0064] Step S5: The scraped-off impurities are discharged from the valve along with the backwash fluid through the turbine seat 81 and the backwash outlet pipe 71;

[0065] Step S6: After backwashing continues for a predetermined time, controller 9 closes the second solenoid valve 72 and restores the first solenoid valve 21 to its normal opening, and the system returns to normal filtration operation.

[0066] Example 1: This example uses backwashing maintenance during routine media transport as an example, combined with the attached... Figure 1 To be continued Figure 9 Detailed explanation of the workflow: The workflow is as follows:

[0067] Step 1: The flow rate sensor 91 monitors the flow rate of the medium in the flow channel 2 in real time and continuously transmits the monitored flow rate signal to the controller 9;

[0068] Step 2: The controller 9 compares the received real-time flow rate value with the preset first threshold to make a judgment;

[0069] Step 3: When the monitored flow rate is lower than the first preset threshold, the controller 9 immediately outputs a control signal to first adjust the first solenoid valve 21 located upstream of the filter component 6 to reduce its opening to reduce the medium flow rate of the main flow channel 2.

[0070] Step 4: Subsequently, the controller 9 controls the second solenoid valve 72 to open, and the high-pressure backwash fluid enters the filter seat 61. On the one hand, it backwashes the filter screen 63 to disperse the attached impurities, and on the other hand, the high-pressure backwash fluid impacts the blades of the turbine body 82, driving the turbine body 82 to rotate in the accommodating cavity of the turbine seat 81.

[0071] Step 5: The turbine body 82 rotates, driving the first bevel gear 83 coaxially connected to it to rotate. The first bevel gear 83 drives the second bevel gear 85 and the cleaning scraper 84 fixedly connected to it to rotate through meshing transmission. The flexible edge of the cleaning scraper 84 makes elastic contact with the inner surface of the filter screen 63, and scrapes away stubborn impurities attached to the inner wall of the filter screen 63 during the rotation.

[0072] Step 6: The impurities dispersed by the backwash and scraped off by the cleaning scraper 84 enter the receiving cavity of the turbine seat 81 along with the backwash fluid, and are then discharged from the valve body 1 through the backwash outlet pipe 71.

[0073] Step 7: When the backwashing process continues for the preset time, the controller 9 controls the second solenoid valve 72 to close, stopping the backwashing, and at the same time controls the first solenoid valve 21 to return to the normal opening, the flow channel 2 resumes normal media delivery, and the system returns to normal filtration operation.

[0074] Example 2: This example uses an emergency treatment case where filter screen 63 remains clogged after backwashing, combined with the attached... Figure 1 To be continued Figure 9 Detailed explanation of the workflow: The workflow is as follows:

[0075] Step 1: Start the backwashing process according to steps 1 to 6 in Example 1. During and after the backwashing process, the flow rate sensor 91 continuously transmits the medium flow rate signal of the flow channel 2 to the controller 9.

[0076] Step 2: After the backwashing process is completed, the controller 9 controls the first solenoid valve 21 to return to its normal opening, and compares the flow rate value monitored by the flow rate sensor 91 at this time with the preset second threshold.

[0077] Step 3: If the monitored flow rate value continues to be lower than the second preset threshold, the controller 9 determines that the filter screen 63 may be seriously blocked or damaged, and immediately outputs an alarm signal to the alarm 92. The alarm 92 issues an audible and visual alarm to prompt the staff to perform manual maintenance.

[0078] Step 4: After receiving the alarm, the staff will close the main switch of the plunger valve to stop the medium delivery, and then open the cover 64 on the filter seat 61 and remove the filter screen 63 from the filter seat 61 along the guide rail 62.

[0079] Step 5: Thoroughly clean the removed filter screen 63 or replace it with a new filter screen 63. After maintenance, put the filter screen 63 back into the filter seat 61 along the retaining rail 62, close the cover 64, and turn the main switch back on. The plunger valve will then resume normal operation.

[0080] This invention integrates a self-cleaning filter component 6 into the flow channel 2, effectively intercepting and automatically removing solid particles from the medium, preventing the valve seat 3 and plunger body 4 from failing due to impurities clogging the mating surfaces. The fluid-driven cleaning unit 8 requires no external power, making it energy-efficient and environmentally friendly. Through the cooperation of the controller 9 and the flow rate sensor 91, automatic detection of blockage and automatic control of the backwashing process are achieved, greatly reducing the need for manual maintenance and improving the reliability and automation of valve operation. The filter screen 63 features a detachable design, facilitating manual intervention and maintenance when automatic cleaning fails; the structure is rationally designed and highly practical.

[0081] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A clog-resistant plunger valve, comprising a valve body (1), a main flow channel (2) disposed within the valve body (1), a valve seat (3) installed in the flow channel (2), a plunger body (4) cooperating with the valve seat (3) to achieve opening and closing, and a valve stem (5) driving the plunger body (4) to move, characterized in that: The flow channel (2) is provided with a filter assembly (6) for intercepting solid particles in the medium; The filter assembly (6) includes a filter base (61) and a filter screen (63) disposed inside the filter base (61). The filter seat (61) is also provided with a cleaning unit (8), which includes a rotatable cleaning scraper (84) and a turbine body (82) connected to the cleaning scraper (84). The cleaning scraper (84) is in contact with the inner surface of the filter screen (63). The filter seat (61) is provided with a backwashing structure (7), the outlet direction of which is directly opposite to the turbine body (82). It is used to drive the cleaning unit (8) to operate by utilizing the impact force of the backwashing fluid, thereby driving the cleaning scraper (84) to rotate to scrape off impurities on the filter screen (63).

2. The anti-clogging plunger valve according to claim 1, characterized in that, The cleaning unit (8) also includes a turbine mount (81), a first bevel gear (83), and a second bevel gear (85) for mounting the turbine body (82). The turbine seat (81) is fixedly disposed on the side of the filter seat (61), and a receiving cavity is formed inside it; The turbine body (82) is rotatably disposed in the receiving cavity of the turbine seat (81), with its blades facing the outlet of the backwash structure (7) to receive the impact of the fluid; The rotating shaft of the turbine body (82) is coaxially connected to the first bevel gear (83); The first bevel gear (83) and the second bevel gear (85) mesh with each other to form a reversing transmission mechanism; The shaft of the second bevel gear (85) is fixedly connected to the cleaning scraper (84).

3. The anti-clogging plunger valve according to claim 2, characterized in that, The backwashing structure (7) also includes a backwashing outlet pipe (71) and a second solenoid valve (72). One end of the backwash outlet pipe (71) is fixedly mounted on the filter seat (61), and the other end passes through the turbine seat (81) and communicates with the internal accommodating cavity of the turbine seat (81); The second solenoid valve (72) is installed on the backwash outlet pipe (71) and is used to control the on / off state of the backwash structure (7).

4. The anti-clogging plunger valve according to claim 3, characterized in that, The filter assembly (6) also includes a rail (62) and a cap (64). The filter screen (63) is detachably installed inside the filter base (61) via the rail (62); The cover (64) is operably disposed on the filter seat (61) for sealing the filter seat (61) so as to maintain or replace the filter screen (63).

5. The anti-clogging plunger valve according to claim 4, characterized in that, A first solenoid valve (21) is also provided on the flow channel (2), and the first solenoid valve (21) is located upstream of the filter assembly (6).

6. The anti-clogging plunger valve according to claim 5, characterized in that, The plunger valve also includes a controller (9), a flow rate sensor (91) and an alarm (92). The flow rate sensor (91) is installed on the flow channel (2) to detect the flow rate of the medium and transmit the signal to the controller (9). The controller (9) is electrically connected to the first solenoid valve (21), the second solenoid valve (72) and the alarm (92).

7. The anti-clogging plunger valve according to claim 6, characterized in that, The controller (9) is configured to: Receive the flow rate signal from the flow rate sensor (91); When the flow rate is lower than the first preset threshold, the first solenoid valve (21) is controlled to reduce its opening or close, and the second solenoid valve (72) is controlled to open to start the backwashing process. After the backwashing process has lasted for a preset time, the second solenoid valve (72) is closed and the first solenoid valve (21) is restored to its normal opening.

8. The anti-clogging plunger valve according to claim 7, characterized in that, The controller (9) is also configured to: if the flow rate value detected by the flow rate sensor (91) continues to be lower than the second preset threshold which is lower than the first preset threshold after the backwashing process is started, then control the alarm (92) to issue an alarm to prompt that manual maintenance is required.

9. The anti-clogging plunger valve according to claim 1, characterized in that, The cleaning scraper (84) is made of a flexible material, and its edges maintain elastic contact with the inner surface of the filter screen (63).

10. A method of using an anti-clogging plunger valve according to any one of claims 1-9, characterized in that, The method of use includes the following steps: Step S1: Real-time monitoring of the medium flow rate in the flow channel (2) by means of the flow rate sensor (91); Step S2: The controller (9) determines whether the flow rate is lower than the first preset threshold; Step S3: If the flow rate is lower than the first preset threshold, the controller (9) outputs a control signal, first adjusting the first solenoid valve (21) to reduce or cut off the main flow, and then opening the second solenoid valve (72). Step S4: The high-pressure backwash fluid passes through the flow channel (2) and the filter seat (61) to backwash the filter screen (63). At the same time, the high-pressure backwash fluid impacts the turbine body (82) through the backwash structure (7), driving it to rotate. Through the meshing transmission of the first bevel gear (83) and the second bevel gear (85), the cleaning scraper (84) rotates and scrapes the inner wall of the filter screen (63). Step S5: The scraped-off impurities are discharged from the valve along with the backwash fluid through the turbine seat (81) and the backwash outlet pipe (71); Step S6: After backwashing continues for a predetermined time, the controller (9) closes the second solenoid valve (72) and restores the first solenoid valve (21) to its normal opening, and the system returns to normal filtration operation.

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