Filters

Abstract

The utility model belongs to the field of valve technology, and discloses a filter. The filter includes a valve body, a filter assembly and a valve cover, the filter assembly is accommodated in the valve body, the valve cover is connected to the valve body and seals the filter assembly in the valve body, a limit cavity is provided in the valve cover, a limit pin is fixedly connected to the filter assembly, the limit pin is detachably axially limited in the limit cavity, and can be rotated relative to the limit cavity. Through the cooperation of the limit pin and the limit cavity, the filter assembly and the valve cover are movably connected, so that the filter assembly can be rotated to avoid the inlet position of the water outlet flow channel so as to reduce the flow resistance, increase the flow area, and increase the flow rate of the water flow, while also increasing the filtration area of ​​the filter assembly and improving the filtration effect.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a filter. Background Art

[0002] The filter is an indispensable device in the fluid medium conveying pipeline. It is usually installed at the inlet end of the pressure reducing valve, pressure relief valve, water level valve or other equipment to filter impurities in the water in the pipeline to prevent impurities from clogging the pipeline or scaling in the pipeline, so as to protect the normal use of the valve equipment.

[0003] The existing filter mainly includes a valve body, a filter assembly and a valve cover. The filter assembly is arranged in the valve body, and the valve cover is used to seal the filter assembly in the valve body. The filter assembly is usually a cylindrical structure, which is formed by bending the mesh plate and overlapping and welding the ends thereof. The welding position is the weld. Since the weld is formed by overlapping and welding the ends of the mesh plate, there is no mesh at the weld. After the filter assembly is assembled into the filter, if the weld faces the water outlet channel, it will affect the flow area and the filtering effect.

[0004] In the existing filters, in order to facilitate the disassembly and cleaning of the filter assembly, the filter assembly and the valve cover are usually fixedly connected by screws or other means. During installation, the filter assembly and the valve cover are first fixedly connected as one body, and then the filter assembly is inserted into the valve body, and the valve cover is threadedly connected to one end of the valve body. Since the filter assembly is fixedly connected to the valve cover, after the filter is assembled, if the weld on the filter assembly faces the water outlet flow channel, the filter assembly cannot be rotated to adjust the direction of its weld, which will affect the flow area and filtering effect of the filter.

[0005] Therefore, there is an urgent need to provide a filter to solve the above problems. Utility Model Content

[0006] The utility model aims to provide a filter, the direction of the weld of which can be adjusted by rotating the filter assembly, thereby increasing the flow area and the filtering effect.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The filter comprises a valve body, a filter assembly and a valve cover, wherein the filter assembly is accommodated in the valve body, the valve cover is connected to the valve body and seals the filter assembly in the valve body, a limiting cavity is provided in the valve cover, a limiting pin is fixedly connected to the filter assembly, the limiting pin can be detachably axially limited in the limiting cavity, and can rotate relative to the limiting cavity.

[0009] As an optional solution, the limit pin includes a rod and a limit member, the rod is fixedly connected to the filter assembly, the limit member is connected to one end of the rod close to the valve cover and extends radially along the rod, the two free ends of the limit member respectively protrude from the circumferential side of the rod, and the limit member can be removably axially limited in the limit cavity and can rotate relative to the limit cavity.

[0010] As an optional solution, an opening is provided on a cavity wall of the limiting cavity close to the filter assembly, the opening is communicated with the limiting cavity, and the limiting pin can extend into the limiting cavity from the opening.

[0011] As an optional solution, the limiting member includes a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are relatively arranged on the circumference of the rod, and the length of the first limiting portion is greater than the length of the second limiting portion;

[0012] The limiting cavity includes a first cavity and a second cavity, the first cavity and the second cavity are butt-jointed and enclosed, the first limiting portion cooperates with the first cavity, and the second limiting portion cooperates with the second cavity, the radial dimension of the first cavity is larger than the radial dimension of the second cavity, so as to form a first limiting surface and a second limiting surface at the intersection of the first cavity and the second cavity, respectively, the first limiting surface and the second limiting surface are arranged on both sides of the opening, and the first limiting portion can selectively abut against the first limiting surface or the second limiting surface.

[0013] As an optional solution, the limiting cavity is arranged at the center of the valve cover, and the limiting pin is arranged at the center of the filter assembly.

[0014] As an optional solution, the filter assembly includes a cylindrical filter screen having a weld seam.

[0015] As an optional solution, the filter assembly also includes a crossbeam, which is fixedly connected to the inside of the filter screen and arranged along the radial direction of the filter screen. The crossbeam is located at one end of the filter screen close to the valve cover, and the limit pin is fixedly connected to the crossbeam.

[0016] As an optional solution, the beam includes a beam body and a connecting portion, the connecting portion is protruding from a side of the beam body close to the limit pin, a mounting hole is provided in the connecting portion, and one end of the limit pin away from the valve cover is fixedly connected to the mounting hole.

[0017] As an optional solution, the filter net includes an inner net and an outer net, the outer net is arranged outside the inner net, and the filter mesh number of the inner net is greater than the filter mesh number of the outer net.

[0018] As an optional solution, the valve body includes a main pipe and a branch pipe that are interconnected, the filter assembly extends from the branch pipe into the main pipe, the valve cover is connected to one end of the branch pipe away from the main pipe, the main pipe is a straight pipe, and the branch pipe is inclined relative to the main pipe.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a filter, wherein the filter assembly and the valve cover are connected together through the cooperation of a limit pin and a limit cavity, wherein the limit pin can rotate circumferentially relative to the limit cavity, so that the filter assembly is movably connected to the valve cover, that is, the filter assembly can rotate relative to the valve cover, so that after the filter is assembled, the operator can extend his hand from the open end of the valve body and rotate the filter assembly, so that the weld of the filter assembly avoids the inlet position of the water outlet flow channel of the valve body, so as to reduce the flow resistance, increase the flow area, and improve the flow rate of the water flow, and at the same time increase the filter area of ​​the filter assembly and improve the filtering effect. In addition, the limit pin can also be axially limited in the limit cavity, so the limit pin is not easy to be separated from the limit cavity. After the filter is assembled, through the axial limit cooperation of the limit pin and the limit cavity, when it is necessary to disassemble and wash the filter assembly, only the valve cover needs to be removed to drive the filter assembly to be removed together, and the filter assembly is easy to clean and replace, which can prevent the problem of inconvenient removal of the filter assembly after scaling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the filter provided by the utility model;

[0022] Figure 2 It is a schematic diagram of the cooperation between the filter assembly and the limit pin provided by the utility model;

[0023] Figure 3 It is a cross-sectional view of the filter assembly provided by the utility model in cooperation with the limit pin;

[0024] Figure 4 It is a cross-sectional view of the valve cover provided by the utility model;

[0025] Figure 5 It is a structural schematic diagram of the valve cover provided by the utility model.

[0026] In the figure:

[0027] 10. Valve body; 11. Main pipe; 111. Water inlet channel; 112. Water outlet channel; 12. Branch pipe; 13. Filter chamber; 14. Water inlet; 15. Water outlet;

[0028] 20. filter assembly; 21. filter screen; 211. inner screen; 212. outer screen; 22. crossbeam; 221. crossbeam body; 222. connecting part; 2221. mounting hole;

[0029] 30. Valve cover; 31. Limiting cavity; 311. First cavity; 312. Second cavity; 313. First limiting surface; 314. Second limiting surface; 32. Opening; 321. First opening; 322. Second opening; 323. Center opening; 33. Sealing ring;

[0030] 40. Limiting pin; 41. Rod; 42. Limiting member; 421. First limiting portion; 422. Second limiting portion. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] This embodiment provides a filter such as Figure 1 and Figure 2 As shown, the filter comprises a valve body 10, a filter assembly 20 and a valve cover 30. The filter assembly 20 is accommodated in the valve body 10. The peripheral side of the filter assembly 20 has a weld. The valve cover 30 is connected to the valve body 10 and blocks the filter assembly 20 in the valve body 10. Specifically, the valve body 10 comprises a main pipe 11 and a branch pipe 12 which are interconnected. The filter assembly 20 extends from the branch pipe 12 into the main pipe 11. A filter chamber 13 for accommodating the filter assembly 20 is formed in the valve body 10. The filter chamber 13 divides the main pipe 11 into a water inlet channel 111 on one side and a water outlet channel 112 on the other side. The intersection of the water inlet channel 111 and the filter chamber 13 forms a water inlet 14. The intersection of the water outlet channel 112 and the filter chamber 13 forms a water outlet 15. The filter assembly 20 is arranged in the filter cavity 13 to filter particulate impurities in the liquid, and the opening at the bottom of the filter assembly 20 faces the water inlet 14, and the valve cover 30 is sealed and connected to the end of the branch pipe 12 away from the main pipe 11. When in use, the liquid flows in from the water inlet channel 111 and flows into the filter assembly 20 through the water inlet 14 for filtration. The filtered impurities remain inside the filter assembly 20 to avoid pipeline blockage, and the filtered liquid flows into the water outlet channel 112 from the water outlet 15.

[0036] In an optional embodiment, if Figure 1 As shown, the filter is a Y-shaped filter. That is, the main pipe 11 is a straight pipe, which is convenient for processing. On this basis, the branch pipe 12 is inclined relative to the main pipe 11, that is, the filter chamber 13 is inclined relative to the water inlet channel 111 and the water outlet channel 112, and the filter chamber 13 is inclined toward one side of the water outlet channel 112.

[0037] like Figure 1As shown, a limiting cavity 31 is provided in the valve cover 30, and a limiting pin 40 is fixedly connected to the filter assembly 20. The limiting pin 40 is detachably axially limited in the limiting cavity 31 and can rotate relative to the limiting cavity. The filter assembly 20 and the valve cover 30 are connected together by the cooperation of the limit pin 40 and the limit cavity 31, wherein the limit pin 40 can rotate circumferentially relative to the limit cavity 31 in the limit cavity 31, so that the filter assembly 20 and the valve cover 30 are movably connected, that is, the filter assembly 20 can rotate relative to the valve cover 30. Therefore, after the filter is assembled and before the valve cover 30 is completely tightened, the operator can observe the direction of the weld on the filter assembly 20 through the water inlet channel 111. If the weld on the filter assembly 20 is facing the water outlet 15, the operator can extend his hand from the inlet end of the water inlet channel 111 and rotate the filter assembly 20, so that the weld of the filter assembly 20 is turned to a position avoiding the water outlet 15, so as to reduce the flow resistance, increase the flow area, and increase the flow rate of water. At the same time, it also increases the filtration area of ​​the filter assembly 20 and improves the filtration effect. In addition, the limit pin 40 can also be axially limited in the limit cavity 31, so the limit pin 40 is not easy to disengage from the limit cavity 31. After the filter is assembled, through the axial limiting cooperation between the limit pin 40 and the limit cavity 31, when the filter assembly 20 needs to be disassembled and cleaned, only the valve cover 30 needs to be removed to drive the filter assembly 20 to be removed together. The filter assembly 20 is easy to clean and replace, and the problem of inconvenient removal of the filter assembly 20 after scaling can be prevented.

[0038] refer to Figure 1 The stop pin 40 is arranged at one end of the filter assembly 20 close to the valve cover 30, and a part of the stop pin 40 is located inside the filter assembly 20, and the other part extends axially to the outside of the filter assembly 20, and the end of the stop pin 40 extending outside the filter assembly 20 cooperates with the stop cavity 31. This arrangement avoids the stop pin 40 being arranged inside the filter assembly 20 and affecting its filtering effect. At the same time, after one end of the stop pin 40 extends outside the filter assembly 20, it cooperates with the stop cavity 31 of the valve cover 30, thereby shortening the axial length of the central part of the valve cover 30 and saving processing costs.

[0039] Furthermore, the limiting cavity 31 is arranged at the center of the valve cover 30, and the limiting pin 40 is arranged at the center of the filter assembly 20. In this way, when the filter assembly 20 is rotated around the axis of the filter assembly 20, it can be ensured that the limiting pin 40 always rotates smoothly in the limiting cavity 31, avoiding the rotation jam phenomenon.

[0040] Optionally, the valve cover 30 can be fixed to the branch pipe 12 by threaded connection to seal the filter assembly 20 in the filter chamber 13, with the bottom end of the filter assembly 20 abutting against the bottom of the filter chamber 13 and the top end of the filter assembly 20 abutting against the valve cover 30, thereby ensuring the installation firmness of the filter assembly 20. Figure 1As shown, a sealing ring 33 is provided between the valve cover 30 and the inner wall of the branch pipe 12 , and the sealing ring 33 can ensure the sealing between the valve cover 30 and the branch pipe 12 to prevent liquid leakage.

[0041] In an optional embodiment, if Figure 2 and Figure 3 As shown, the stop pin 40 includes a rod 41 and a stop member 42. The rod 41 is fixedly connected to the filter assembly 20. The stop member 42 is connected to one end of the rod 41 close to the valve cover 30 and extends radially along the rod 41. The two free ends of the stop member 42 protrude from the circumference of the rod 41. The stop member 42 is detachably axially limited in the stop cavity 31 and can rotate circumferentially relative to the stop cavity 31. The rod 41 can be a cylindrical rod, and the stop member 42 can be a long strip structure. The two free ends of the stop member 42 protrude from the circumference of the rod 41, so that the stop member 42 and the rod 41 are similar in structure to each other. Figure 3 The T-shaped structure shown in the figure has a simple structure for the limit pin 40. The limit member 42 can be well axially limited in the limit cavity 31 to avoid escaping from the limit cavity 31, and can also smoothly rotate circumferentially in the limit cavity 31.

[0042] Combination Figure 4 and Figure 5 An opening 32 is provided on the cavity wall of the limiting cavity 31 on one side close to the filter assembly 20, and the opening 32 is connected to the limiting cavity 31, and the limiting pin 40 can extend from the opening 32 into the limiting cavity 31. The size of the opening 32 is smaller than the size of the limiting cavity 31, so that the limiting pin 40 can be axially limited in the limiting cavity 31 after passing through the opening 32. During assembly, first ensure that the limiting member 42 is directly opposite to the opening 32, and insert the limiting member 42 from the opening 32 into the limiting cavity 31, and then rotate the valve cover 30 axially so that the limiting member 42 avoids the position of the opening 32 and is axially limited in the limiting cavity 31, so that the valve cover 30 can drive the filter assembly 20 to be removed together for cleaning and replacement. When the filter assembly 20 needs to be removed from the valve cover 30, the valve cover 30 or the filter assembly 20 only needs to be rotated so that the limit member 42 is opposite to the opening 32, and the filter assembly 20 and the valve cover 30 can be disassembled. The operation is convenient and the assembly and disassembly of the filter assembly 20 and the valve cover 30 are convenient.

[0043] Combination Figures 2 to 5The limiting member 42 includes a first limiting portion 421 and a second limiting portion 422 . The first limiting portion 421 and the second limiting portion 422 are relatively arranged on the circumferential side of the rod 41 . The length of the first limiting portion 421 is greater than the length of the second limiting portion 422 . The limiting cavity 31 includes a first cavity 311 and a second cavity 312, which can be selected to be approximately semicircular cavities, and the first cavity 311 and the second cavity 312 are arranged to be butted and enclosed, the first limiting portion 421 cooperates with the first cavity 311, and the second limiting portion 422 cooperates with the second cavity 312, and the radial dimension of the first cavity 311 is greater than the radial dimension of the second cavity 312, so that a first limiting surface 313 and a second limiting surface 314 are respectively formed at the intersection of the first cavity 311 and the second cavity 312, and the first limiting surface 313 and the second limiting surface 314 are respectively arranged on both sides of the opening 32, and the first limiting portion 421 can selectively abut against the first limiting surface 313 or the second limiting surface 314. Preferably, the first limiting surface 313 and the second limiting surface 314 are symmetrically arranged on both sides of the opening 32, and are respectively perpendicular to the extension direction of the opening 32.

[0044] Exemplarily, during assembly, the filter assembly 20 is first roughly placed in the filter cavity 13, and then the valve cover 30 is installed on the valve body 10. During installation, the opening 32 is first aligned with the limit member 42, and then the valve cover 30 is pushed to make the limit member 42 extend from the opening 32 into the limit cavity 31, and then the valve cover 30 is rotated counterclockwise to make the limit member 42 avoid the position of the opening 32 and be axially limited in the limit cavity 31. At this time, the first limit portion 421 rotates relatively around the rotation axis in the first cavity 311, and the second limit portion 422 rotates relatively around the rotation axis in the second cavity 312. When the first limit portion 421 abuts against the first limit surface 313, it indicates that the valve cover 30 is installed in place. When the filter assembly 20 needs to be disassembled and cleaned, the valve cover 30 is screwed clockwise until the first limiting portion 421 abuts against the second limiting surface 314, which means that the limiting member 42 is not directly opposite to the opening 32, but forms an axial limiting fit with the limiting cavity 31. At this time, the valve cover 30 can be disassembled and the filter assembly 20 can be removed together, which is convenient for cleaning and replacement of the filter assembly 20. The screwing directions of the valve cover 30 during installation and removal can be interchanged.

[0045] It is understandable that since the filter assembly 20 is sealed inside the valve body 10 by the valve cover 30, the operator cannot see the internal limit pin 40 and the limit cavity 31 when screwing the valve cover 30. If the limit cavity 31 is set as a circular cavity, then it will be a blind turn when removing the valve cover 30. After the valve cover 30 is screwed, the operator is not clear about the positional relationship between the limit member 42 and the opening 32. If the limit member 42 is exactly opposite to the opening 32, the limit member 42 will fall out of the opening 32, and the filter assembly 20 cannot be removed together with the valve cover 30, which makes the disassembly of the filter assembly 20 cumbersome. Therefore, in this embodiment, by setting the limit member 42 into a first limit portion 421 and a second limit portion 422, one long and one short, and setting the limit cavity 31 into a first cavity 311 and a second cavity 312 that are respectively large and small, thereby forming a first limit surface 313 and a second limit surface 314, which can serve as a reminder for the operator during the operation process. The abutment between the first limit portion 421 and the first limit surface 313 can serve as a reminder that the valve cover 30 is in place. The abutment between the first limit portion 421 and the second limit surface 314 can remind the operator that the limit member 42 and the limit cavity 31 form an axial limit fit at this time, avoiding the situation where the limit member 42 is directly opposite to the opening 32. At this time, the valve cover 30 can be disassembled and the filter assembly 20 can be disassembled together.

[0046] The opening 32 is adapted to the end of the limit pin 40 close to the valve cover 30. Specifically, Figure 4 and Figure 5 As shown, the opening 32 specifically includes a first opening 321, a second opening 322 and a central opening 323, the central opening 323 is located between the first opening 321 and the second opening 322, the first opening 321 is located on a side close to the first cavity 311, the second opening 322 is located on a side close to the second cavity 312, the central opening 323 is substantially circular and matches the rod 41, the length of the first opening 321 is greater than the length of the second opening 322, the first opening 321 matches the first limiting portion 421, and the second opening 322 matches the second limiting portion 422. When the opening 32 is directly opposite to the top end of the limiting pin 40, it means that the first opening 321 is directly opposite to the first limiting portion 421, the second opening 322 is directly opposite to the second limiting portion 422, and the central opening 323 is directly opposite to the rod 41. Through the above-mentioned opening 32, the first limiting portion 421 can extend from the first port 321 into or out of the first cavity 311, the second limiting portion 422 can extend from the second port 322 into or out of the second cavity 312, and the rod 41 can penetrate into or out of the center port 323, thereby facilitating the assembly and disassembly of the filter assembly 20 and the valve cover 30.

[0047] In an optional embodiment, if Figures 1 to 3As shown, the filter assembly 20 includes a filter screen 21 and a crossbeam 22. The filter screen 21 has a weld and is in a cylindrical shape with both ends open. The filter screen 21 is accommodated in the filter cavity 13. The crossbeam 22 is fixedly connected to the inside of the filter screen 21 and is arranged along the radial direction of the filter screen 21. The crossbeam 22 is located at one end of the filter screen 21 close to the valve cover 30, and the limit pin 40 is fixedly connected to the crossbeam 22. The above arrangement enables the limit pin 40 to be stably and reliably fixedly connected to the filter assembly 20 through the crossbeam 22, so that the limit pin 40 and the filter assembly 20 form an integrated structure.

[0048] In an optional embodiment, if Figure 2 and Figure 3 As shown, the cross beam 22 includes a cross beam body 221 and a connecting portion 222. The connecting portion 222 is convexly arranged on one side of the cross beam body 221 close to the stop pin 40. A mounting hole 2221 is arranged in the connecting portion 222. One end of the stop pin 40 away from the valve cover 30 is fixedly connected in the mounting hole 2221. The stop pin 40 can be fixedly connected in the mounting hole 2221 by welding, threaded connection, glue bonding, etc. Through the cooperation between the stop pin 40 and the mounting hole 2221, the contact area between the stop pin 40 and the cross beam 22 can be increased, so that the stop pin 40 is stably and reliably fixedly connected to the cross beam 22, so that the stop pin 40 and the filter assembly 20 form a stable integrated structure.

[0049] In the existing filter, the filter screen 21 is usually a single layer, the structural strength of the single layer filter screen 21 is poor, and the filter screen 21 is easily deformed.

[0050] In order to solve the above problem, in an optional embodiment, as Figure 2 As shown, the filter screen 21 is configured as a double-layer screen. Specifically, the filter screen 21 includes an inner screen 211 and an outer screen 212 that are fixedly connected. The outer screen 212 is set and attached to the outside of the inner screen 211. A plurality of mesh holes are provided on the inner screen 211 and the outer screen 212. The outer screen 212 cooperates with the filter cavity 13 to mainly play a supporting role, and the inner screen 211 mainly plays a filtering role. By configuring the filter screen 21 as a double-layer screen, the structural strength of the filter screen 21 is improved, the structure is more stable, and it is not easy to deform, so that the filter screen 21 can maintain a good filtering effect in a complex working environment.

[0051] Furthermore, the number of meshes of the inner net 211 is greater than that of the outer net 212, that is, within a unit area, the number of meshes of the inner net 211 is greater than that of the outer net 212, and the larger the number of meshes, the smaller the aperture of the mesh, that is, the aperture of the mesh of the inner net 211 is smaller than that of the outer net 212. This arrangement makes the filtering effect of the inner net 211 better, the inner net 211 can capture smaller particles, and the outer net 212 can intercept larger particles, thereby achieving a more refined filtering effect. Due to the efficient filtering performance of the double-layer filter 21, downstream equipment can be protected, the service life of the equipment can be extended, and the maintenance and replacement costs of the equipment can be reduced.

[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A filter, comprising a valve body (10), a filter assembly (20) and a valve cover (30), wherein the filter assembly (20) is accommodated in the valve body (10), and the valve cover (30) is connected to the valve body (10) and seals the filter assembly (20) in the valve body (10), characterized in that: A limiting cavity (31) is provided in the valve cover (30), and a limiting pin (40) is fixedly connected to the filter assembly (20). The limiting pin (40) is detachably axially limited in the limiting cavity (31) and is rotatable relative to the limiting cavity (31).

2. The filter according to claim 1, characterized in that The limiting pin (40) comprises a rod (41) and a limiting member (42); the rod (41) is fixedly connected to the filter assembly (20); the limiting member (42) is connected to one end of the rod (41) close to the valve cover (30) and extends radially along the rod (41); two free ends of the limiting member (42) respectively protrude from the circumferential side of the rod (41); the limiting member (42) is detachably axially limited in the limiting cavity (31) and can rotate relative to the limiting cavity (31).

3. The filter according to claim 2, characterized in that An opening (32) is provided on a cavity wall of the limiting cavity (31) close to the filter assembly (20); the opening (32) is communicated with the limiting cavity (31); and the limiting pin (40) can extend from the opening (32) into the limiting cavity (31).

4. The filter according to claim 3, characterized in that The limiting member (42) comprises a first limiting portion (421) and a second limiting portion (422), wherein the first limiting portion (421) and the second limiting portion (422) are arranged relatively on the circumference of the rod (41), and the length of the first limiting portion (421) is greater than the length of the second limiting portion (422); The limiting cavity (31) comprises a first cavity (311) and a second cavity (312); the first cavity (311) and the second cavity (312) are arranged to be butt-jointed and enclosed; the first limiting portion (421) cooperates with the first cavity (311); the second limiting portion (422) cooperates with the second cavity (312); the radial dimension of the first cavity (311) is greater than the radial dimension of the second cavity (312), so as to form a first limiting surface (313) and a second limiting surface (314) at the intersection of the first cavity (311) and the second cavity (312); the first limiting surface (313) and the second limiting surface (314) are respectively arranged on both sides of the opening (32); the first limiting portion (421) can selectively abut against the first limiting surface (313) or the second limiting surface (314).

5. The filter according to any one of claims 1 to 4, characterized in that: The limiting cavity (31) is arranged at the center of the valve cover (30), and the limiting pin (40) is arranged at the center of the filter assembly (20).

6. The filter according to any one of claims 1 to 4, characterized in that: The filter assembly (20) comprises a cylindrical filter screen (21) having a weld seam.

7. The filter according to claim 6, characterized in that The filter assembly (20) further comprises a crossbeam (22), wherein the crossbeam (22) is fixedly connected to the interior of the filter screen (21) and is arranged along the radial direction of the filter screen (21), and the crossbeam (22) is located at one end of the filter screen (21) close to the valve cover (30), and the limit pin (40) is fixedly connected to the crossbeam (22).

8. The filter according to claim 7, characterized in that The crossbeam (22) comprises a crossbeam body (221) and a connecting portion (222), wherein the connecting portion (222) is protruding from a side of the crossbeam body (221) close to the limit pin (40), and a mounting hole (2221) is provided in the connecting portion (222), and one end of the limit pin (40) away from the valve cover (30) is fixedly connected in the mounting hole (2221).

9. The filter according to claim 6, characterized in that The filter net (21) comprises an inner net (211) and an outer net (212); the outer net (212) is sleeved outside the inner net (211); and the filtering mesh number of the inner net (211) is greater than the filtering mesh number of the outer net (212).

10. The filter according to any one of claims 1 to 4, characterized in that: The valve body (10) comprises a main pipe (11) and a branch pipe (12) which are interconnected, the filter assembly (20) extends from the branch pipe (12) into the main pipe (11), the valve cover (30) is connected to one end of the branch pipe (12) away from the main pipe (11), the main pipe (11) is a straight pipe, and the branch pipe (12) is arranged obliquely relative to the main pipe (11).

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