Filter assembly and filter

Abstract

A filter assembly (10) and a filter (100). The filter assembly (10) comprises a filter screen (11) and a supporting frame group (13), wherein the filter screen (11) is provided with an accommodating cavity (111), and part of the supporting frame group (13) is arranged in the accommodating cavity (111) to support the filter screen (11); the supporting frame group (13) comprises first supporting strips (131) and second supporting strips (132), and each second supporting strip (132) is located on an inner side of the corresponding first supporting strip (131) and is in lap joint with the first supporting strip (131); and at the lap joints between the first supporting strips (131) and the second supporting strips (132), the second supporting strips (132) are provided with recesses (1321) recessed towards an opening (1111) of the filter screen (11), and at least part of the first supporting strips (131) located at the lap joints are accommodated in the recesses (1321) in the axial direction of the accommodating cavity (111).

Description

Filter components and filters

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 202321696450.X, filed on June 30, 2023, entitled “Filter Component and Filter,” the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the field of filtration technology, and in particular to a filtration component and a filter. Background Art

[0004] Air conditioning systems are often equipped with filters to filter out impurities, thereby avoiding accidents caused by blockage of system equipment or pipelines due to impurities.

[0005] Filters typically incorporate a filter screen, which is barrel-shaped to increase its filtration area. Multiple support bars are installed within the barrel-shaped filter screen to support the filter screen. However, because the support bars in related art are stacked crosswise, there are height differences between the bottoms of the bars, resulting in insufficient support for the filter screen in some areas of the bottom bars. Over extended use, the filter screen is prone to deformation, reducing its filtration effectiveness.

[0006] Summary of the Invention

[0007] According to various embodiments of the present application, it is necessary to provide a filter assembly and a filter.

[0008] The present application provides a filter assembly, which includes a filter screen and a support frame group, the filter screen is provided with a accommodating cavity, and part of the support frame group is arranged in the accommodating cavity to support the filter screen; the support frame group includes a first support bar and a second support bar, the second support bar is located on the inner side of the first support bar and overlaps with the first support bar; wherein, at the overlap of the first support bar and the second support bar, the second support bar has a recessed groove recessed toward the opening direction of the filter screen, and along the axial direction of the accommodating cavity, at least a part of the first support bar located at the overlap is accommodated in the recessed groove of the second support bar.

[0009] In one embodiment, at the overlap of the first support bar and the second support bar, the entire first support bar at the overlap is accommodated in the recessed groove, and a side of the first support bar away from the opening and a side of the second support bar away from the opening are located in the same plane.

[0010] In one embodiment, the support frame group also includes a third support bar, which is located on the inner side of the second support bar and overlaps with the second support bar, and the third support bar has a avoidance groove recessed toward the opening; along the axial direction of the accommodating cavity, at least a portion of the overlapping portion of the second support bar located below, or all of the overlapping portion of the second support bar and at least a portion of the overlapping portion of the first support bar are accommodated in the avoidance groove of the third support bar located above.

[0011] In one embodiment, along the axial direction of the accommodating cavity, all of the overlapping parts of the second support bar located below and all of the overlapping parts of the first support bar located above are accommodated in the avoidance groove on the third support bar located above, and a side of the third support bar away from the opening and a side of the second support bar away from the opening and a side of the first support bar away from the opening are located in the same plane.

[0012] In one embodiment, the depth of the recessed groove is defined as H1, the depth of the avoidance groove is defined as H2, and the thicknesses of the first support bar, the second support bar, and the third support bar are all h, wherein H1=h, H2=2h.

[0013] In one embodiment, the first support bar, the second support bar and the third support bar are evenly distributed along the circumference of the accommodating cavity; the center point of the first support bar, the center point of the second support bar and the center point of the third support bar coincide with each other, and are all on the same straight line with the axis of the accommodating cavity.

[0014] In one embodiment, the filter assembly further includes a fixing ring group, the fixing ring group includes an outer fixing ring and an inner fixing ring, the filter net is provided with a flange at one end close to the opening, and the flange is clamped between the outer fixing ring and the inner fixing ring; and / or, the first support bar and the second support bar are U-shaped, and the first support bar and the second support bar are bent at the opening and overlapped with the inner fixing ring.

[0015] In one embodiment, the filter screen is configured as a mesh plate, which is bent and arranged to form a filter barrel body. Along the circumference of the filter barrel body, the two ends of the mesh plate are connected by overlapping.

[0016] In one embodiment, along the circumference of the filter barrel body, a first hook portion is formed at one end of the mesh plate, and a second hook portion is formed at the other end of the mesh plate, and the first hook portion and the second hook portion are hooked to each other.

[0017] The present application also provides a filter, which includes a barrel and the filter assembly described in any one of the above embodiments, wherein the filter assembly is installed in the barrel.

[0018] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to better describe and illustrate the embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the accompanying drawings should not be considered to limit the scope of the disclosed inventions, the presently described embodiments and / or examples, and any of the best modes currently understood for these inventions.

[0020] FIG1 is a schematic structural diagram of a filter assembly according to an embodiment of the present application.

[0021] FIG2 is a cross-sectional view of a filter assembly according to an embodiment of the present application.

[0022] FIG2A is an enlarged structural schematic diagram of point A in FIG2 .

[0023] FIG3 is a schematic diagram of a partial structure of a filter assembly according to an embodiment of the present application.

[0024] FIG4 is a cross-sectional view of a filter screen structure according to an embodiment of the present application.

[0025] FIG5 is a schematic structural diagram of a filter according to an embodiment of the present application.

[0026] The symbols in the figure represent the following meanings: 100, filter; 10, filter assembly; 11, filter screen; 111, accommodating chamber; 1111, opening; 112, filter barrel; 1121, first hook; 1122, second hook; 12, fixing ring group; 121, outer fixing ring; 122, inner fixing ring; 13, support frame group; 131, first support bar; 132, second support bar; 1321, recessed groove; 133, third support bar; 1331, avoidance groove; 20, cylinder; 21, necking portion; 22, limiting portion; 30, connecting bushing. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0028] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In this application, unless otherwise expressly specified or limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or that the first feature and the second feature are indirectly in contact through an intermediate medium. Furthermore, a first feature being “above,” “above,” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below,” “below,” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0032] Air conditioning systems are often equipped with filters to filter out impurities, thereby preventing accidents caused by impurity blockage in system equipment or pipelines. A filter screen is usually installed in the filter for filtration, and the filter screen is barrel-shaped to increase the filtering area of ​​the filter screen. In addition, multiple support bars are provided in the barrel-shaped filter screen to support the filter screen. However, because the multiple support bars in the related art are stacked crosswise with each other, there are height differences between the bottoms of the multiple support bars, resulting in insufficient support for the filter screen in some areas of the bottom of the support bars. During long-term use, the filter screen is prone to deformation, thereby reducing the filtering effect of the filter screen.

[0033] Please refer to FIG1 . In order to solve the problem in the related art that the support bars do not provide sufficient support to the filter screen, causing the filter screen to be easily deformed, the present application provides a filter assembly 10 for filtering impurities in pipelines or equipment.

[0034] The filter assembly 10 includes a filter screen 11 and a support frame assembly 13. The filter screen 11 is provided with a receiving chamber 111. A portion of the support frame assembly 13 is disposed within the receiving chamber 111 to support the filter screen 11. The support frame assembly 13 includes a first support bar 131 and a second support bar 132. The second support bar 132 is located inside the first support bar 131 and overlaps the first support bar 131. At the overlap between the first support bar 131 and the second support bar 132, the second support bar 132 has a recessed groove 1321 that is recessed toward the opening 1111 of the filter screen 11. Along the axial direction of the receiving chamber 111, at least a portion of the first support bar 131 at the overlap is received within the recessed groove 1321 of the second support bar 132.

[0035] By providing the recessed groove 1321 on the second support bar 132, when the second support bar 132 is stacked with the first support bar 131, the second support bar 132 can avoid the first support bar 131 at the overlap with the first support bar 131, thereby reducing the height difference between the side of the second support bar 132 away from the opening 1111 and the side of the first support bar 131 away from the opening 1111 along the axial direction of the accommodating chamber 111, or maintaining the two sides flush. Because the support frame assembly 13 is required to support the filter screen 11, the side of the first support bar 131 away from the opening 1111 is arranged to abut the filter screen 11, reducing or evening the height difference between the side of the second support bar 132 away from the opening 1111 and the filter screen 11. In this way, the second support bar 132 can better support the filter screen 11, thereby preventing deformation of the filter screen 11 and effectively ensuring the filtering effect of the filter screen 11.

[0036] It should be noted that the structures of the first support bar 131 and the second support bar 132 are substantially the same, except that the second support bar 132 is provided with a recessed groove 1321 at the overlapping portion.

[0037] It should also be noted that the side of the second support bar 132 away from the opening 1111 refers to the end surface of the portion of the second support bar 132 away from the opening 1111 and not at the overlapping portion.

[0038] Furthermore, in one embodiment, as shown in Figures 2 and 3, at the overlap of the first support bar 131 and the second support bar 132, along the axial direction of the accommodating cavity 111, the entire first support bar 131 located at the overlap is accommodated in the recessed groove 1321, and the side of the first support bar 131 away from the opening 1111 and the side of the second support bar 132 away from the opening 1111 are located in the same plane or are flush with each other.

[0039] In this way, since the part of the first support bar 131 at the overlap is completely accommodated in the recessed groove 1321, it can ensure that the side of the second support bar 132 away from the opening 1111 can also abut against the filter screen 11, thereby further improving the supporting strength of the second support bar 132 on the filter screen 11 and preventing the filter screen 11 from deforming.

[0040] In order to clearly illustrate the technical solution of the present application, an upper direction (see the X direction in FIG. 2 ) and a lower direction (see the Y direction in FIG. 2 ) as shown in FIG. 2 are also defined.

[0041] In one embodiment, as shown in FIG3 , the support frame assembly 13 further includes a third support bar 133. The third support bar 133 is located inside the second support bar 132 and overlaps the second support bar 132. The third support bar 133 has a relief groove 1331 that is recessed toward the opening 1111. The provision of the third support bar 133 further enhances the support effect of the support frame assembly 13 on the filter 11.

[0042] It should be noted that the third support bar 133 is located on the inner side of the second support bar 132: along the axial direction of the filter screen 11, the overlapping part of the third support bar 133 and the second support bar 132 is closer to the opening 1111 of the filter screen 11 than the corresponding overlapping part of the second support bar 132.

[0043] Furthermore, along the axial direction of the accommodating cavity 111, at least part of the overlapping portion of the second support bar 132 located below, or all of the overlapping portion of the second support bar 132 and at least part of the overlapping portion of the first support bar 131 are accommodated in the avoidance groove 1331 of the third support bar 133 located above.

[0044] That is, when the third support bar 133 is provided, the third support bar 133 can also avoid the second support bar 132 and the first support bar 131 located below through the avoidance groove 1331, thereby reducing the height difference between the side of the third support bar 133 away from the opening 1111 and the side of the first support bar 131 away from the opening 1111. This allows the third support bar 133 to also provide better support for the filter 11, preventing the filter 11 from deforming.

[0045] Furthermore, in one embodiment, along the axial direction of the accommodating cavity 111, all of the overlapping parts of the second support bar 132 located below and all of the overlapping parts of the first support bar 131 are accommodated in the avoidance groove 1331 on the third support bar 133 located above, and the side of the third support bar 133 away from the opening 1111 and the side of the second support bar 132 away from the opening 1111 and the side of the first support bar 131 away from the opening 1111 are located in the same plane.

[0046] Similarly, the side of the third support bar 133 away from the opening 1111 here refers to the end surface of the portion of the third support bar 133 away from the opening 1111 and not at the overlapping portion.

[0047] In this way, since the second support bar 132 located at the bottom and the first support bar 131 located at the overlapping part are all accommodated in the avoidance groove 1331 on the third support bar 133 located at the top, it can ensure that the side of the third support bar 133 located at the top away from the opening 1111 can also abut against the filter screen 11, thereby further improving the supporting strength of the third support bar 133 on the filter screen 11 and avoiding deformation of the filter screen 11.

[0048] Of course, without affecting the filtering effect of the filter screen 11, a fourth support bar, a fifth support bar, and so on can be further provided. There is no limit on the number of support bars. The support bars are stacked, and at least part of the overlap of the support bar at the bottom is accommodated in the corresponding recessed structure of the support bar at the top.

[0049] 2 and 2A , further, in one embodiment, the depth of the recessed groove 1321 is defined as H1, the depth of the avoidance groove 1331 is defined as H2, and the thicknesses of the first support bar 131, the second support bar 132, and the third support bar 133 are all defined as h, where H1 = h and H2 = 2h. Similarly, if the support frame assembly 13 also includes a fourth support bar, the depth of the corresponding recessed structure on the fourth support bar is 3h, and so on.

[0050] In this way, it can ensure that the side of the second support bar 132 and the third support bar 133 away from the opening 1111 is in the same plane as the side of the first support bar 131 away from the opening 1111, thereby improving the support reliability of the second support bar 132 and the third support bar 133 on the filter screen 11, and can also avoid the depth of the recessed groove 1321 or the avoidance groove 1331 being too large, resulting in an increase in the material of the second support bar 132 or the third support bar 133, thereby reducing the manufacturing cost.

[0051] In one embodiment, as shown in Figures 2 and 3, the first support bar 131, the second support bar 132, and the third support bar 133 are distributed, specifically, evenly distributed, along the circumference of the accommodating cavity 111. The center points of the first support bar 131, the second support bar 132, and the third support bar 133 coincide with each other and are all on the same straight line with the axis of the accommodating cavity 111.

[0052] That is, the first support bar 131, the second support bar 132, and the third support bar 133 are evenly arranged crosswise relative to the axis of the accommodating chamber 111. In this way, the support force exerted on the filter 11 is more uniform, which can improve the supporting effect of the first support bar 131, the second support bar 132, and the third support bar 133 on the filter 11.

[0053] Furthermore, the overlapping parts of the first support bar 131, the second support bar 132 and the third support bar 133 can be fixed by spot welding to improve the connection stability between the first support bar 131, the second support bar 132 and the third support bar 133, thereby improving the force uniformity of the filter screen 11.

[0054] 1 to 3 , in one embodiment, the filter assembly 10 further includes a fixing ring assembly 12 . An end of the filter screen 11 near the opening 1111 is connected to the fixing ring assembly 12 , and the support frame assembly 13 is connected to the fixing ring assembly 12 .

[0055] It should be noted that the connection between the filter screen 11 and the fixed ring group 12 can be that the filter screen 11 is connected to the fixed ring group 12 by welding or bonding, or that the filter screen 11 is connected to the fixed ring group 12 by snapping, or other connection methods that are easily conceivable in the art. The support frame group 13 can also be connected to the fixed ring group 12 by the above-mentioned connection method.

[0056] Furthermore, in one embodiment, the fixing ring assembly 12 includes an outer fixing ring 121 and an inner fixing ring 122 . A flange (not shown) is provided at one end of the filter screen 11 close to the opening 1111 , and the flange is clamped between the outer fixing ring 121 and the inner fixing ring 122 .

[0057] In this way, the filter screen 11 is connected to the outer fixing ring 121 and the inner fixing ring 122 by the flange, which can increase the contact area between the filter screen 11 and the fixing ring assembly 12, thereby ensuring a firm connection between the filter screen 11 and the fixing ring assembly 12.

[0058] In one embodiment, the flange, the inner fixing ring 122 and the outer fixing ring 121 are fixedly connected by spot welding to further improve the connection strength between the filter screen 11 and the fixing ring assembly 12 .

[0059] Of course, in other embodiments, the inner fixing ring 122 and the outer fixing ring 121 can also be an interference fit, and the filter screen 11 is clamped between the inner fixing ring 122 and the outer fixing ring 121 through the interference fit between the inner fixing ring 122 and the outer fixing ring 121, as long as a firm connection between the filter screen 11, the inner fixing ring 122 and the outer fixing ring 121 can be achieved.

[0060] Furthermore, in one embodiment, the flange and the filter screen 11 are integrally formed to improve the installation firmness of the filter screen 11 .

[0061] In one embodiment, the first support bar 131 and the second support bar 132 are U-shaped. Portions of the first support bar 131 and the second support bar 132 located at the opening 1111 are bent and overlapped with the inner fixing ring 122 .

[0062] In this way, the first support bar 131 and the second support bar 132 are overlapped with the inner fixing ring 122 through the bent parts, which can further improve the installation firmness of the support frame assembly 13.

[0063] Likewise, the third support bar 133 is also U-shaped, and the portion of the third support bar 133 located at the opening 1111 is bent and overlapped with the inner fixing ring 122 to further enhance the installation firmness of the support frame assembly 13 .

[0064] Specifically, the inner retaining ring 122 and the outer retaining ring 121 have an L-shaped cross-section, which facilitates the overlapping of the first support bar 131, the second support bar 132, and the third support bar 133. Furthermore, to further enhance the connection strength between the first support bar 131, the second support bar 132, and the third support bar 133 and the inner retaining ring 122, the overlapping portions of the first support bar 131, the second support bar 132, and the third support bar 133 and the inner retaining ring 122 may be spot welded, providing a more stable connection.

[0065] In one embodiment, the filter 11 is configured as a mesh plate, which is bent and arranged to surround the filter barrel 112. The two ends of the mesh plate are connected by overlapping along the circumference of the filter barrel 112. The mesh plate is bent to form the filter 11, which can improve the processing efficiency of the filter 11 and reduce the difficulty of forming the filter 11.

[0066] Furthermore, in one embodiment, as shown in FIG1 and FIG4 , along the circumference of the filter barrel body 112 , a first hook 1121 is formed at one end of the mesh plate, and a second hook 1122 is formed at the other end of the mesh plate, and the first hook 1121 and the second hook 1122 are hooked to each other.

[0067] In this way, the connection strength of the mesh plate along the circumferential ends of the filter barrel body 112 can be improved. The first hook 1121 and the second hook 1122 can be formed by bending the mesh plate, and along the axial direction of the accommodating cavity 111, the two ends of the first hook 1121 and the second hook 1122 extend to the two ends of the filter barrel body 112.

[0068] Furthermore, in one embodiment, the first hook 1121 and the second hook 1122 are fixed by welding to further improve the connection strength between the first hook 1121 and the second hook 1122, thereby preventing the first hook 1121 and the second hook 1122 from separating from each other, thereby affecting the filtration of the filter net 11.

[0069] Since the filter screen 11 is formed by bending the mesh plate, the mesh plate arranged at the end of the filter screen 11 away from the opening 1111 will overlap in multiple places when forming the bottom of the filter barrel body 112. Among them, the mesh plates located in the overlapping areas can be cross-arranged and fixed by spot welding to specifically form the filter barrel body 112 and ensure the integrity of the filter barrel body 112.

[0070] In one embodiment, the filter assembly 10 is made of stainless steel, which is relatively cheap and can reduce the cost of the filter assembly 10 .

[0071] Please refer to FIG. 5 . The present application further provides a filter 100 . The filter 100 includes a barrel 20 and the filter assembly 10 described in any one of the above embodiments. The filter assembly 10 is installed in the barrel 20 .

[0072] Specifically, the inner wall of the cylinder 20 is provided with a stopper 22 corresponding to the fixing ring assembly 12. The stopper 22 stops at both ends of the fixing ring assembly 12 along the axial direction of the cylinder 20, thereby achieving the fixation of the filter assembly 10 in the cylinder 20. The stopper 22 can be formed by the inner wall of the cylinder 20 protruding toward the direction close to the central axis of the cylinder 20.

[0073] Furthermore, the cylinder 20 has constricted portions 21 formed at both ends along its axial direction by spinning or water expansion. The filter 100 further includes a connecting bushing 30, which is mounted on and connected to the cylinder 20 via the constricted portion 21. The filter 100 is connected to an external pipe via the connecting bushing 30. The cylinder 20 is made of stainless steel, and the connecting bushing 30 is made of copper.

[0074] In this way, setting the cylinder 20 to stainless steel can reduce the cost of the filter 100, and since most of the pipes in the air-conditioning system are copper parts, setting the connecting sleeve 30 to a copper component can facilitate the connection of the filter 100 to the external pipe, reducing the difficulty of welding the filter 100 to the external pipe.

[0075] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. A filter assembly, characterized in that: It comprises a filter screen and a support frame group, the filter screen is provided with a receiving cavity, and part of the support frame group is arranged in the receiving cavity to support the filter screen; the support frame group comprises a first support bar and a second support bar, the second support bar is located on the inner side of the first support bar and overlaps with the first support bar; Among them, at the overlap of the first support bar and the second support bar, the second support bar has a recessed groove recessed toward the opening direction of the filter screen, and along the axial direction of the accommodating cavity, at least a portion of the first support bar located at the overlap is accommodated in the recessed groove of the second support bar.

2. The filter assembly according to claim 1, wherein: At the overlap of the first support bar and the second support bar, the first support bar at the overlap is entirely received in the recessed groove, and a side of the first support bar away from the opening and a side of the second support bar away from the opening are located in the same plane.

3. The filter assembly according to claim 2, wherein: The support frame assembly further includes a third support bar, the third support bar is located on the inner side of the second support bar and overlaps with the second support bar, and the third support bar has an avoidance groove recessed toward the opening direction; Along the axial direction of the accommodating cavity, at least part of the overlapping portion of the second support bar located below, or all of the overlapping portion of the second support bar and at least part of the overlapping portion of the first support bar are accommodated in the avoidance groove of the third support bar located above.

4. The filter assembly according to claim 3, wherein: Along the axial direction of the accommodating cavity, all of the overlapping parts of the second support bar located below and all of the overlapping parts of the first support bar are accommodated in the avoidance groove on the third support bar located above, and a side of the third support bar away from the opening is in the same plane as a side of the second support bar away from the opening and a side of the first support bar away from the opening.

5. The filter assembly according to claim 4, wherein: The depth of the recessed groove is defined as H1, the depth of the avoidance groove is defined as H2, and the thicknesses of the first support bar, the second support bar and the third support bar are all defined as h, wherein H1=h, H2=2h.

6. The filter assembly according to any one of claims 3 to 5, wherein: The first support bar, the second support bar and the third support bar are evenly distributed along the circumference of the accommodating cavity; The center point of the first support bar, the center point of the second support bar and the center point of the third support bar coincide with each other and are all on the same straight line with the axis of the accommodating cavity.

7. The filter assembly according to claim 1, wherein: The filter assembly further comprises a fixing ring group, the fixing ring group comprises an outer fixing ring and an inner fixing ring, the filter screen is provided with a flange at one end close to the opening, and the flange is sandwiched between the outer fixing ring and the inner fixing ring; And / or, the first support bar and the second support bar are U-shaped, and the first support bar and the second support bar are bent at the opening and overlapped with the inner fixing ring.

8. The filter assembly according to claim 1, wherein: The filter screen is configured as a mesh plate, which is bent and surrounded to form a filter barrel body. Along the circumference of the filter barrel body, two ends of the mesh plate are connected by overlapping.

9. The filter assembly according to claim 8, wherein: Along the circumference of the filter barrel body, a first hook portion is formed at one end of the mesh plate, and a second hook portion is formed at the other end of the mesh plate, and the first hook portion and the second hook portion are hooked with each other.

10. A filter, characterized in that: The invention comprises a cylinder and a filter assembly as claimed in any one of claims 1 to 9, wherein the filter assembly is installed in the cylinder.

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