A filter self-cleaning valve ball and a self-cleaning method thereof

Abstract

The application belongs to the technical field of valves, and particularly relates to a filter self-cleaning valve ball and a self-cleaning method thereof. The filter self-cleaning valve ball comprises a ball body provided with a through hole, a support and a sliding ring installed in the through hole, and the through hole comprises an inlet end and an outlet end. A conical filter screen is installed on one side of the support close to the inlet end of the through hole, and the conical filter screen is connected with the sliding ring and can drive the conical filter screen to unfold or fold when the sliding ring slides. A spring is installed on the support, and the spring abuts against the sliding ring. A ring groove is formed on the surface of the sliding ring away from the shaft center, and a sealing ring is installed in the ring groove. The conical filter screen is unfolded or folded by the medium pressure and the spring reset drive, impurities, especially filter layers, possibly adhered to the conical filter screen are broken, the conical filter screen is prevented from being blocked due to long-time accumulation, the self-cleaning effect is ensured, the service life of the ball valve is prolonged, and the subsequent maintenance and cleaning efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and particularly relates to a filter self-cleaning valve ball and its self-cleaning method. Background Technology

[0002] The ball is a key component in a ball valve used for opening and closing the flow path. It consists of a ball with a through hole for opening and closing the flow path. In use, the flow path corresponding to the through hole is opened or closed by rotating the ball.

[0003] Traditional ball valves typically lack filtration capabilities, necessitating the addition of filtration devices in applications requiring it. This not only increases potential leak points but also raises costs. Consequently, some ball valves incorporate conical filters within the ball. However, these filters are usually fixed in place, making them prone to accumulating impurities. This can impede the flow of media within the pipeline, reduce the lifespan of the ball valve, and further hinder subsequent maintenance and cleaning efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a self-cleaning filter ball and its self-cleaning method, which achieves filtration effect and can self-clean impurities on the conical filter screen, thereby extending the service life of the ball valve and improving the efficiency of subsequent maintenance and cleaning.

[0005] In view of this, the present invention provides a filter self-cleaning valve ball, comprising: A sphere with a through hole inside, the through hole including an inlet end and an outlet end; A support is installed in the through hole, and a conical filter screen is installed on the side near the inlet end of the through hole; The sliding ring is slidably connected in the through hole along the axial direction and is connected to the conical filter screen. It is used to drive the conical filter screen to unfold or fold when sliding axially. The spring is mounted on the support, with its two ends abutting against the support and the sliding ring, respectively. The sliding ring has an annular groove on its surface away from the shaft, and a sealing ring is installed in the annular groove.

[0006] In the above technical solution, the support further includes: The connecting part, installed inside the through hole, is used to connect the support and the ball; The cylinder has a connecting part at one end and a limiting part at the other end. A sliding ring is sleeved on the cylinder, and a spring is used to push the sliding ring against the limiting part and fold the conical filter screen. In this system, a flow gap is formed between the sliding ring and the limiting part. When the sliding ring compresses the chamber on one side of the through hole inlet end, the spring's restoring force is always greater than the sum of the resistance generated by compressing the chamber on one side of the through hole inlet end and the sliding friction resistance between the sliding ring and the inner wall of the through hole. After the sliding ring and the limiting part cooperate, the through hole can be reverse-cut off.

[0007] In the above technical solution, further: A first boss is formed on the inner wall of the through hole to limit the upper limit of the axial sliding stroke of the sliding ring towards the outlet end of the through hole.

[0008] In the above technical solution, further: The inner wall of the through hole near its outlet end is provided with an internal thread, and the surface of the connecting part is provided with an external thread that engages with the internal thread. The through hole is connected to a limit ring at the internal thread, and the limit ring is located on the side of the connection near the outlet end of the through hole.

[0009] In the above technical solution, further: The connecting part has a first flow hole along the axial direction for communication between the outlet end of the through hole and the inside of the cylinder, and the cylinder has a second flow hole along the radial direction for communication between the inlet end of the through hole and the inside of the cylinder.

[0010] In the above technical solution, further: The connecting part has a second boss on the side close to the spring along the axial direction, which is used for radial limiting of the spring end.

[0011] In the above technical solution, further: The sliding ring has a first chamfer on the side near the limiting part along the axial direction, and the limiting part has a second chamfer that matches the first chamfer. A sealing gasket is installed between the first chamfer and the second chamfer.

[0012] Furthermore, the above technical solution also includes: The limiting rod has two ends connected to the connecting part and the limiting part, respectively. The sliding ring has a sliding hole that is slidably connected to the limiting rod.

[0013] In the above technical solution, further: A first drive groove is provided on the side of the limiting part near the inlet end of the through hole; The limiting ring has a second drive groove through it.

[0014] This invention provides a self-cleaning method for a filter self-cleaning valve ball, comprising the following steps: S1: When in use, the through hole is connected to the pipe by rotating the ball; S2: The flowing medium in the pipeline enters the through hole from the inlet end, and as the pressure increases, it gradually pushes the sliding ring to move axially along the through hole and compresses the spring; S3: The axial movement of the sliding ring drives and unfolds the conical filter screen. The flowing medium passes through the conical filter screen and is discharged from the outlet end of the through hole through the first flow hole and the second flow hole. S4: After use, rotate the ball to prevent the through hole from connecting to the pipe. S5: The flowing medium in the pipeline cannot enter the through hole through the inlet end of the through hole. The spring pushes the sliding ring to reset, which drives the conical filter screen and folds it. S6: After the first chamfer and the second chamfer are combined, the through hole can be reverse-cut off.

[0015] The beneficial effects of this invention are as follows: 1. The conical filter screen is opened or folded by the medium pressure and spring reset to break up impurities that may adhere to the conical filter screen, especially the filter layer, so as to avoid the conical filter screen being blocked due to long-term accumulation, ensure the self-cleaning effect, extend the service life of the ball valve and improve the efficiency of subsequent maintenance and cleaning. Later, you only need to disassemble one side of the ball valve inlet end and rotate the valve ball to the open state to pour out the impurities from the through hole inlet end.

[0016] 2. When the sliding ring is driven by the spring's reset force and abuts against the limiting part, it can achieve a reverse shut-off effect on the valve ball, avoiding the backflow of the flowing medium due to the increased pressure on one side of the through hole outlet, and has a good unidirectional conduction effect.

[0017] 3. The support adopts a connecting part, a cylinder and a limiting part, which facilitates the unfolding and folding of the conical filter screen through the cooperation between the sliding ring and the limiting part. The first flow hole on the connecting part and the second flow hole on the cylinder facilitate the smooth flow of the fluid medium between the inlet and outlet ends. The structure is simple. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the internal structure of the conical filter screen of the present invention when folded; Figure 4 This is the present invention. Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the internal structure of the conical filter screen of the present invention when it is unfolded; The markings in the diagram represent: 1. Sphere; 2. Conical filter screen; 3. Through hole; 30. Inlet end; 31. Outlet end; 4. Support; 40. Connecting part; 41. Cylinder; 42. Limiting part; 5. Sliding ring; 6. Spring; 7. Annular groove; 8. Sealing ring; 9. Flow gap; 10. First boss; 11. Internal thread; 12. External thread; 13. Limiting ring; 14. First flow hole; 15. Second flow hole; 16. Second boss; 17. First chamfer; 18. Second chamfer; 19. Sealing gasket; 20. Limiting rod; 21. Sliding hole; 22. First drive groove; 23. Second drive groove. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0020] Example 1:

[0021] This embodiment provides a filter self-cleaning valve ball, comprising: The sphere 1 has a through hole 3 inside, and the through hole 3 includes an inlet end 30 and an outlet end 31; Support 4 is installed in through hole 3, and a conical filter screen 2 is installed on the side near the inlet end 30 of through hole 3; The sliding ring 5 is slidably connected in the through hole 3 along the axial direction and connected to the conical filter screen 2. It is used to drive the conical filter screen 2 to unfold or fold when sliding axially. Spring 6 is mounted on support 4, and its two ends abut against support 4 and sliding ring 5 respectively; Among them, the sliding ring 5 has an annular groove 7 on its surface away from the axis, and a sealing ring 8 is installed in the annular groove 7; Meanwhile, the ball 1 is also provided with a groove that mates with the valve stem of the ball valve, and the spring 6 can be a compression spring 6, and the sealing ring 8 can be made of rubber, and there are at least two annular grooves 7 and sealing rings 8.

[0022] As can be seen from this embodiment, by installing a support 4 and a sliding ring 5 inside the ball 1 of the valve ball, and setting a conical filter screen 2 between the support 4 and the sliding ring 5, when the valve ball is opened, the sliding ring 5 compresses the spring 6 under the pressure of the flowing medium and unfolds the conical filter screen 2, thereby achieving the conduction and filtration of the flowing medium. After the valve ball is rotated, the through hole 3 is misaligned with the pipeline, so that the flowing medium in the pipeline cannot enter the through hole 3. Then, under the action of the spring 6 resetting, the sliding ring 5 will be pushed to reset. During the reset process, the flowing medium in the chamber between the inlet end 30 of the through hole 3 and the sliding ring 5 is forced out. At the same time, the conical filter screen 2 is folded by the sliding ring 5, which breaks up the impurities that may adhere to the conical filter screen 2, especially the filter layer, to avoid long-term accumulation and blockage of the conical filter screen 2, ensuring the self-cleaning effect, extending the service life of the ball valve and improving the efficiency of subsequent maintenance and cleaning. Later, it is only necessary to disassemble the valve inlet end 30 of the ball valve and rotate the valve ball to the open state to pour out the impurities from the inlet end 30 of the through hole 3. Using a conical filter screen 2 for filtration serves two purposes: firstly, it facilitates the folding of the conical filter screen 2 when the sliding ring 5 slides; secondly, the conical structure allows the flowing medium to self-clean the surface of the conical filter screen 2 when it is unfolded, further improving the self-cleaning effect of filtration. Furthermore, one end of the conical filter screen 2 is connected to the support 4, and the other end is connected to the sliding ring 5, which can limit the axial sliding distance of the sliding ring 5 and ensure structural stability. Furthermore, the sealing ring 8 provides a buffer for the sliding of the sliding ring 5, preventing the valve ball from losing the pressure of the flowing medium at the inlet end 30 of the through hole 3 due to rotation, reducing the instantaneous reset force of the spring 6 pushing the sliding ring 5, providing a certain buffer and deceleration effect for the extension and contraction of the spring 6, ensuring that the sliding ring 5 smoothly abuts against the support 4, and reducing the impact caused by collision.

[0023] Example 2:

[0024] This embodiment provides a filter self-cleaning valve ball, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the support 4 includes: The connecting part 40 is installed in the through hole 3 and is used to connect the support 4 and the ball 1; The cylinder 41 is connected to the connecting part 40 at one end and a limiting part 42 is provided at the other end. The sliding ring 5 is sleeved on the cylinder 41, and the spring 6 is used to push the sliding ring 5 to abut against the limiting part 42 and fold the conical filter screen 2. In this process, a flow gap 9 is formed between the sliding ring 5 and the limiting part 42. When the sliding ring 5 compresses the chamber on the side of the inlet end 30 of the through hole 3, the restoring force of the spring 6 is always greater than the sum of the resistance generated by compressing the chamber on the side of the inlet end 30 of the through hole 3 and the sliding friction resistance between the sliding ring 5 and the inner wall of the through hole 3. After the sliding ring 5 and the limiting part 42 are engaged, the through hole 3 can be reverse-cut off.

[0025] As can be seen from this embodiment, by using a connecting part 40, a cylinder 41 and a limiting part 42 for the support 4, the cone-shaped filter screen 2 can be unfolded or folded by the cooperation of the limiting part 42 and the sliding ring 5, while the cylinder 41 provides installation space for the spring 6, so that the spring 6 can push the sliding ring 5 to the limiting part 42 side to reset. Furthermore, when the sliding ring 5 is driven by the resetting force of the spring 6 and abuts against the limiting part 42, it can achieve the reverse cut-off effect on the valve ball, avoiding the backflow of the flowing medium due to the increase in pressure on the side of the outlet end 31 of the through hole 3, and has a good unidirectional conduction effect. Meanwhile, when the valve ball is rotated to cut off the connection between the inlet end 30 of the through hole 3 and the pipeline, when the spring 6 pushes the sliding ring 5 to fold the conical filter screen 2, the sliding ring 5 compresses the chamber on the side of the inlet end 30 of the through hole 3, which will generate resistance to the movement of the sliding ring 5. This resistance will gradually decrease as the fluid medium flows out of the gap between the sliding ring 5 and the limiting part 42 through the conical filter screen 2. Therefore, during the entire process of the sliding ring 5 resetting, the chamber on the side of the inlet end 30 of the through hole 3 cut off the connection between the inlet end 30 of the through hole 3 and the pipeline by rotating the valve ball will have a certain buffering effect on the sliding of the sliding ring 5, further ensuring the stability of the sliding of the sliding ring 5. The restoring force of spring 6 is always greater than the sum of the resistance generated by the compression of the cavity on one side of the inlet end 30 of the through hole 3 by the sliding ring 5 and the sliding friction resistance between the sliding ring 5 and the inner wall of the through hole 3, which can ensure the sliding restoring of the sliding ring 5.

[0026] Example 3:

[0027] This embodiment provides a filter self-cleaning valve ball, which, in addition to the technical solutions of the above embodiments, also has the following technical features: A first protrusion 10 is formed on the inner wall of the through hole 3 to limit the upper limit of the axial sliding stroke of the sliding ring 5 towards the outlet end 31 of the through hole 3.

[0028] As can be seen from this embodiment, the setting of the first boss 10 facilitates the limitation of the maximum axial sliding stroke of the sliding ring 5 under the driving force of the flowing medium pressure, avoids excessive sliding stroke caused by excessive pressure at the inlet end 30 of the through hole 3, protects the conical filter screen 2, prevents tearing, and extends the service life of the conical filter screen 2.

[0029] Example 4:

[0030] This embodiment provides a filter self-cleaning valve ball, which, in addition to the technical solutions of the above embodiments, also has the following technical features: An internal thread 11 is provided on the inner wall of the through hole 3 near its outlet end 31, and an external thread 12 that engages with the internal thread 11 is provided on the surface of the connecting part 40. Among them, the through hole 3 is connected to the internal thread 11 and the limiting ring 13 is located on the side of the connecting part 40 near the outlet end 31 of the through hole 3.

[0031] As can be seen from this embodiment, by using a threaded connection between the connecting part 40 and the ball 1, the ease of disassembling and assembling the support 4 is improved. Furthermore, the setting of the limiting ring 13 facilitates the adjustment of the axial installation position of the connecting part 40 within the through hole 3, thus improving convenience. At the same time, the annular structure of the limiting ring 13 can prevent the through hole 3 from affecting the flow of the medium, ensuring the flow of the medium at the valve ball.

[0032] Example 5:

[0033] This embodiment provides a filter self-cleaning valve ball, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The connecting part 40 is provided with a first flow hole 14 along the axial direction for communication between the outlet end 31 of the through hole 3 and the inside of the cylinder 41. The cylinder 41 is provided with a second flow hole 15 along the radial direction for communication between the inlet end 30 of the through hole 3 and the inside of the cylinder 41.

[0034] As can be seen from this embodiment, by opening the first flow hole 14 and the second flow hole 15, the flowing medium passes through the conical filter screen 2 and is then discharged from the outlet end 31 of the through hole 3 through the first flow hole 14 and the second flow hole 15, ensuring the flow of the fluid medium and facilitating the axial discharge of the fluid medium. At the same time, the structure of the cylinder 41 can avoid interference with the extension and contraction of the spring 6 and the sliding of the sliding ring 5.

[0035] Example 6:

[0036] This embodiment provides a filter self-cleaning valve ball, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The connecting part 40 has a second boss 16 on the side close to the spring 6 along the axial direction, which is used for radial limiting of the end of the spring 6.

[0037] As can be seen from this embodiment, the setting of the second boss 16 facilitates the improvement of the installation stability of the spring 6, thereby ensuring the stability and uniformity of the spring 6's reset force, avoiding radial tilting of the sliding ring 5 during sliding, and thus ensuring the sliding stability of the sliding ring 5 and preventing jamming.

[0038] Example 7:

[0039] This embodiment provides a filter self-cleaning valve ball, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The sliding ring 5 has a first chamfer 17 on the side close to the limiting part 42 along the axial direction, and the limiting part 42 has a second chamfer 18 that matches the first chamfer 17; A sealing gasket 19 is installed between the first chamfer 17 and the second chamfer 18.

[0040] As can be seen from this embodiment, by opening the first chamfer 17 and the second chamfer 18, on the one hand, the axial separation of the sliding ring 5 from the limiting part 42 due to the force of the spring 6 is reduced, and the structural stability of the limiting part 42 is improved. On the other hand, the sealing gasket 19 can ensure the sealing performance when the flowing medium is cut off in reverse.

[0041] Example 8:

[0042] This embodiment provides a filter self-cleaning valve ball, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and further includes: The limiting rod 20 is connected at both ends to the connecting part 40 and the limiting part 42, respectively. The sliding ring 5 has a sliding hole 21 that is slidably connected to the limiting rod 20.

[0043] As can be seen from this embodiment, by setting the limiting rod 20, not only is the connection strength and stability between the connecting part 40 and the limiting part 42 improved, but the coaxiality between the connecting part 40 and the limiting part 42 is also guaranteed, thereby improving structural stability and the fitting accuracy between the sliding ring 5 and the limiting part 42. At the same time, the sliding ring 5 is provided with a sliding hole 21 that is slidably connected to the limiting rod 20, so that the limiting rod 20 can provide a guiding effect for the sliding of the sliding ring 5 and ensure the sliding stability of the sliding ring 5 under the pressure of the flowing medium.

[0044] Example 9:

[0045] This embodiment provides a filter self-cleaning valve ball, which, in addition to the technical solutions of the above embodiments, also has the following technical features: A first drive groove 22 is provided on the side of the limiting part 42 near the inlet end 30 of the through hole 3; The limiting ring 13 has a second drive groove 23 through it; The first drive slot 22 and the second drive slot 23 can both adopt a structure that is compatible with conventional wrenches, such as an internal hexagonal wrench. This is known and used by those skilled in the art from traditional drive slots, and will not be described in detail here.

[0046] As can be seen from this embodiment, the opening of the first drive groove 22 facilitates the installation and disassembly of the support 4 and the adjustment of the axial installation position of the support 4 in the through hole 3. The second drive groove 23 can facilitate the adjustment of the installation position of the limiting ring 13 in the axial direction of the through hole 3, thereby facilitating the adjustment of the installation reference of the support 4 in the axial direction of the through hole 3. At the same time, the cooperation between the limiting ring 13 and the connecting part 40 can improve the structural stability of the support 4 installed in the through hole 3.

[0047] Example 10:

[0048] This embodiment provides a self-cleaning method for a filter self-cleaning valve ball, including the following steps: S1: When in use, the through hole 3 is connected to the pipe by rotating the ball 1; S2: The flowing medium in the pipeline enters the through hole 3 from the inlet end 30 of the through hole 3, and as the pressure increases, it gradually pushes the sliding ring 5 to move axially along the through hole 3 and compresses the spring 6; S3: The axial movement of the sliding ring 5 drives and unfolds the conical filter screen 2. The flowing medium passes through the conical filter screen 2 and is discharged from the outlet end 31 of the through hole 3 through the first flow hole 14 and the second flow hole 15. S4: After use, rotate ball 1 to make the through hole 3 no longer connected to the pipe; S5: The flowing medium in the pipeline cannot enter the through hole 3 through the inlet end 30 of the through hole 3. The spring 6 pushes the sliding ring 5 to reset, which drives the conical filter screen 2 and folds it. S6: After the first chamfer 17 and the second chamfer 18 are engaged, the through hole 3 can be reverse-cut off.

[0049] As can be seen from this embodiment, when the through hole 3 is connected to the pipeline by rotating the valve ball, the conical filter screen 2 will unfold after the sliding ring 5 is pushed to slide by the pressure of the flowing medium, ensuring the filtration of the flowing medium. Based on the structure of the conical filter screen 2, it can reduce the adhesion of impurities on the conical filter screen 2 and has a certain self-cleaning effect. At the same time, when the through hole 3 is no longer connected to the pipeline by rotating the valve ball, the conical filter screen 2 will push the sliding ring 5 to reset under the reset force of the spring 6 and fold. At this time, it can further achieve the self-cleaning effect on the impurities attached to the conical filter screen 2, which can extend the service life of the valve ball filter and provide a better buffer period for impurity cleaning. When the pressure of the flowing medium at the outlet end 31 of the through hole 3 increases due to possible accidents, reverse shut-off can be achieved by the contact between the sliding ring 5 and the limiting part 42, thereby improving the safety of use.

[0050] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A filter self-cleaning valve ball, characterized in that, include: The sphere (1) has a through hole (3) inside, and the through hole (3) includes an inlet end (30) and an outlet end (31). A support (4) is installed in the through hole (3), and a conical filter screen (2) is installed on the side near the inlet end (30) of the through hole (3); The sliding ring (5) is slidably connected in the through hole (3) along the axial direction and connected to the conical filter screen (2) to drive the conical filter screen (2) to unfold or fold when sliding axially; Spring (6) is installed on support (4) and its two ends abut against support (4) and sliding ring (5) respectively; The sliding ring (5) has an annular groove (7) on its surface away from the axis, and a sealing ring (8) is installed in the annular groove (7).

2. The filter self-cleaning valve ball according to claim 1, characterized in that, The support (4) includes: The connecting part (40) is installed in the through hole (3) and is used to connect the support (4) and the ball (1); The cylinder (41) is connected to the connecting part (40) at one end and a limiting part (42) is provided at the other end. The sliding ring (5) is sleeved on the cylinder (41), and the spring (6) is used to push the sliding ring (5) to abut against the limiting part (42) and fold the conical filter screen (2). In this process, a flow gap (9) is formed between the sliding ring (5) and the limiting part (42). When the sliding ring (5) compresses the chamber on the side of the inlet end (30) of the through hole (3), the restoring force of the spring (6) is always greater than the sum of the resistance generated by compressing the chamber on the side of the inlet end (30) of the through hole (3) and the sliding friction resistance between the sliding ring (5) and the inner wall of the through hole (3). After the sliding ring (5) and the limiting part (42) cooperate, the through hole (3) can be reverse-cut off.

3. The filter self-cleaning valve ball according to claim 2, characterized in that: The inner wall of the through hole (3) is formed with a first boss (10) to limit the upper limit of the axial sliding of the sliding ring (5) towards the outlet end (31) of the through hole (3).

4. The filter self-cleaning valve ball according to claim 2, characterized in that: The through hole (3) has an internal thread (11) on the inner wall near its outlet end (31), and the connecting part (40) has an external thread (12) that meshes with the internal thread (11). The through hole (3) is connected to a limiting ring (13) at the internal thread (11), and the limiting ring (13) is located on the side of the connecting part (40) near the outlet end (31) of the through hole (3).

5. The filter self-cleaning valve ball according to claim 2, characterized in that: The connecting part (40) is provided with a first flow hole (14) along the axial direction for the passage hole (3) outlet end (31) side to communicate with the inside of the cylinder (41), and the cylinder (41) is provided with a second flow hole (15) along the radial direction for the passage hole (3) inlet end (30) side to communicate with the inside of the cylinder (41).

6. The filter self-cleaning valve ball according to claim 2, characterized in that: The connecting part (40) has a second boss (16) on the side of the spring (6) along the axial direction, which is used for radial limiting of the end of the spring (6).

7. The filter self-cleaning valve ball according to claim 2, characterized in that: The sliding ring (5) has a first chamfer (17) on the side of the limiting part (42) along the axial direction, and the limiting part (42) has a second chamfer (18) that matches the first chamfer (17). A sealing gasket (19) is installed between the first chamfer (17) and the second chamfer (18).

8. The filter self-cleaning valve ball according to claim 2, characterized in that, Also includes: The limiting rod (20) is connected at both ends to the connecting part (40) and the limiting part (42), respectively; The sliding ring (5) has a sliding hole (21) that is slidably connected to the limiting rod (20).

9. The filter self-cleaning valve ball according to claim 4, characterized in that: The limiting part (42) has a first driving groove (22) on the side near the inlet end (30) of the through hole (3); The limiting ring (13) has a second drive groove (23) through it.

10. A self-cleaning method for a filter self-cleaning valve ball according to any one of claims 1-9, characterized in that, Includes the following steps: S1: When in use, rotate the ball (1) to make the through hole (3) connect with the pipe; S2: The flowing medium in the pipeline enters the through hole (3) from the inlet end (30) of the through hole (3), and as the pressure increases, it gradually pushes the sliding ring (5) to move axially along the through hole (3) and compresses the spring (6). S3: The axial movement of the sliding ring (5) drives and unfolds the conical filter screen (2), and the flowing medium passes through the conical filter screen (2) and is discharged from the outlet end (31) of the through hole (3) through the first flow hole (14) and the second flow hole (15); S4: After use, rotate the ball (1) to make the through hole (3) no longer connect with the pipe; S5: The flowing medium in the pipe cannot enter the through hole (3) through the inlet end (30) of the through hole (3). The spring (6) pushes the sliding ring (5) to reset, which drives the conical filter screen (2) and folds it. S6: After the first chamfer (17) and the second chamfer (18) are engaged, the through hole (3) can be reverse-cut off.

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