filter

Abstract

A filter includes a cavity, a cover plate, a first self-locking member, a second self-locking member, and an adjustment rod. The first self-locking member is positioned on the cover plate and located at a first through hole on the cover plate, and the first self-locking member includes a first tooth. The second self-locking member is connected to the first self-locking member and located at a second through hole on the first self-locking member, and the second self-locking member includes a second tooth. The first tooth and the second tooth are separable by a threaded connection. When the first tooth and the second tooth are separated, the second self-locking member can move up and down relative to the first self-locking member. The adjustment rod is fixed below the second self-locking member. The adjustment rod in this invention avoids the wire problems caused by threaded movement in traditional structures, reducing manufacturing risks and costs.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency, and in particular to a filter. Background Technology

[0002] In the filter industry, tuning screw assemblies consist of tuning screws, lock nuts, and external serrated washers, or tuning screws and lock nuts. These components are numerous, complex to assemble, costly, and inefficient. Based on traditional structural designs, cavity filters require a separate process in actual production to install lock nuts / external serrated washers on the cover plate. Only after this process does the product reach the tuning area. Furthermore, due to the large number of parts and significant cumulative tolerances, coupled with the fact that all threaded connections are made of metal, metal wires are easily generated during assembly, affecting the product's electrical performance and reliability. This results in low production efficiency, resource waste, and high production costs. Utility Model Content

[0003] The purpose of this invention is to provide a filter that avoids the problem of metal wires caused by the up-and-down movement of the threaded connection in traditional structures, thereby reducing manufacturing risks and lowering manufacturing costs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a filter, comprising:

[0005] cavity;

[0006] A cover plate, which covers the cavity to form a chamber, the cover plate having a first through hole extending through the vertical direction;

[0007] A first self-locking member is positioned on the cover plate and located at the first through hole. The first self-locking member includes a first tooth and has a second through hole that extends through the vertical direction.

[0008] A second self-locking member is connected to the first self-locking member and located at the second through hole. The second self-locking member includes a second tooth portion, and the first tooth portion and the second tooth portion are connected by a separable toothed thread. When the first tooth portion and the second tooth portion are separated, the second self-locking member can move up and down relative to the first self-locking member.

[0009] The adjustment rod is fixed below the second self-locking member and extends into the cavity.

[0010] As a further improvement of the present invention, the first self-locking component also includes a hollow cylindrical main body.

[0011] The main body has an upper opening and a lower opening arranged in opposite directions. The upper opening is away from the cavity and the lower opening faces the cavity. The second through hole connects the upper opening and the lower opening. The main body also has an inner wall surface and an outer wall surface arranged in opposite directions. The first tooth is located in the second through hole and protrudes from the inner wall surface.

[0012] As a further improvement of the present invention, the first tooth portion includes an integrally connected connecting root portion and a vertical portion. The connecting root portion is perpendicular to and connected to the inner wall surface, and the vertical portion is parallel to and spaced apart from the inner wall surface. The first tooth portion has a plurality of first tooth patterns, and the first tooth patterns are located on the vertical portion.

[0013] As a further improvement of the present invention, the first tooth further includes a free end formed at the end of the vertical portion and spaced from the inner wall surface, the free end giving the first tooth elasticity so that the first tooth can be biased toward the main body portion.

[0014] As a further improvement of the present invention, the first tooth includes an arc-shaped guide portion, which is connected between the connecting root and the vertical portion. In contrast, the connecting root and the arc-shaped guide portion are closer to the lower opening, and the free end is closer to the upper opening.

[0015] As a further improvement of the present invention, the first through hole and the second through hole are circular holes with a radial direction, the diameter of the first through hole is larger than the diameter of the second through hole, and the extension length of the connecting root in the radial direction is less than 1 / 2 of the radius of the second through hole.

[0016] As a further improvement of the present invention, the first tooth has a plurality of first tooth patterns and the second tooth has a plurality of second tooth patterns, wherein the number of second tooth patterns on the second tooth is greater than the number of first tooth patterns on the first tooth.

[0017] As a further improvement of the present invention, the first tooth and the second tooth are a pair, the first teeth on each first tooth are arranged at intervals in the vertical direction and the first teeth on a pair of first teeth are arranged face to face in the second through hole, the second teeth on each second tooth are arranged at intervals in the vertical direction and the second teeth on a pair of second teeth are arranged back to back on the second self-locking member.

[0018] As a further improvement of the present invention, the first self-locking component further includes a baffle and a buckle portion integrally connected to the main body. The baffle is arranged around the outside of the main body and abuts against the upper surface of the cover plate. The buckle portion extends to the lower surface of the cover plate and abuts against the baffle on the upper and lower sides of the cover plate.

[0019] As a further improvement of the present invention, the buckle portion extends downward from the baffle along the outer wall to form a hook close to the lower opening, and the hook protrudes outward from the outer wall: the buckle portion is a pair, and a pair of recesses are provided on opposite sides of the first through hole, and the pair of recesses are used to allow the pair of buckle portions to pass through.

[0020] As a further improvement of the present invention, both the first self-locking member and the second self-locking member are made of non-metallic materials.

[0021] Compared to existing technologies, this utility model includes a first self-locking component, a second self-locking component, and an adjustment rod. The adjustment rod is fixed below the second self-locking component and extends into the cavity for frequency adjustment. The first self-locking component includes a first tooth, and the second self-locking component includes a second tooth. The first tooth and the second tooth are connected by a separable toothed thread. When the first tooth and the second tooth are separated, the second self-locking component can move up and down relative to the first self-locking component. Therefore, when the adjustment rod moves up and down with the second self-locking component, the first tooth and the second tooth are separated, so no metal wire is generated during the up and down movement. This avoids the metal wire problem caused by the threaded connection during the up and down movement in traditional structures. Furthermore, the use of two self-locking components reduces the difficulty of assembly, manufacturing risks and difficulties, and manufacturing costs. Attached Figure Description

[0022] Figure 1 This is a three-dimensional assembly diagram of the filter of this utility model;

[0023] Figure 2 This is a three-dimensional exploded view of the filter of this utility model;

[0024] Figure 3 This is a three-dimensional exploded view of a frequency modulation unit in the filter of this utility model;

[0025] Figure 4 This is a perspective view of the first self-locking component in the filter of this utility model;

[0026] Figure 5 This is a perspective view of the first self-locking component in the filter of this utility model from another angle;

[0027] Figure 6This is a front view of the first self-locking component in the filter of this utility model;

[0028] Figure 7 This is a top view of the first self-locking component in the filter of this utility model;

[0029] Figure 8 It is along Figure 7 Sectional view of line AA in the middle;

[0030] Figure 9 This is a three-dimensional exploded view of the second self-locking component and the adjustment rod in the filter of this utility model;

[0031] Figure 10 yes Figure 9 Another perspective of the exploded 3D view;

[0032] Figure 11 yes Figure 9 Another perspective of the exploded 3D view;

[0033] Figure 12 This is a top view of the filter of this utility model;

[0034] Figure 13 It is along Figure 12 Sectional view of the middle BB line;

[0035] Figure 14 It is along Figure 12 A cross-sectional view of the CC line;

[0036] Figure 15 yes Figure 13 Enlarged view of section D;

[0037] Figure 16 yes Figure 14 Enlarged view of section E in the middle;

[0038] Figure 17 yes Figure 2 Enlarged view of section F in the middle. Detailed Implementation

[0039] The exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. If several embodiments exist, features in these embodiments may be combined with each other without conflict. When the description refers to the drawings, unless otherwise stated, the same numbers in different drawings represent the same or similar elements. The descriptions in the following exemplary embodiments do not represent all embodiments consistent with the present invention; rather, they are merely examples of apparatuses, products, and / or methods consistent with some aspects of the present invention as set forth in the claims.

[0040] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of protection of this invention. The singular forms “a,” “the,” or “the” used in the specification and claims of this invention are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0041] It should be understood that the terms "first," "second," and similar words used in the specification and claims of this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish the features. Similarly, the terms "an" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. Unless otherwise stated, the terms "front," "back," "left," "right," "upper," "lower," and similar words appearing in this utility model are for ease of explanation only and are not limited to a specific location or spatial orientation. The terms "comprising" or "including" are an open-ended expression, meaning that the element preceding "comprising" or "including" covers the element following "comprising" or "including" and its equivalents, which does not exclude that the element preceding "comprising" or "including" may also include other elements. If "several" appears in this utility model, it means two or more.

[0042] Please refer to Figures 1 to 17 As shown, this utility model relates to a filter 100, which includes: a cavity 1, a cover plate 2, a first self-locking member 3, a second self-locking member 4, and an adjustment rod 5. The adjustment rod 5 is detachably and detachably positioned on the cover plate 2 through the first self-locking member 3 and the second self-locking member 4. The use of the first self-locking component 3 and the second self-locking component 4 reduces assembly difficulty. During the up-and-down movement of the second self-locking component 4, the first self-locking component 3 and the second self-locking component 4 are in a separated state, meaning that the second self-locking component 4 will not come into contact with the first self-locking component 3 during its up-and-down movement, thus reducing the generation of metal wires during adjustment. After adjustment, the first self-locking component 3 and the second self-locking component 4 are then locked together to achieve frequency modulation. Because both the first self-locking component 3 and the second self-locking component 4 are made of non-metallic materials, the adjustment rod 5 moves up and down with the second self-locking component 4, and the two non-metallic materials are connected by a toothed connection. This avoids the metal wire problem caused by the threaded movement in traditional structures, while also preventing loosening of the threads, reducing manufacturing risks, lowering manufacturing costs, and improving the long-term stability of the product. Furthermore, the use of non-metallic materials also reduces the overall weight.

[0043] Please refer to Figures 1 to 3 and Figure 17As shown, the cover plate 2 covers the cavity 1 to form a chamber 10. The cover plate 2 has a first through hole 20 extending vertically. There is at least one first through hole 20, and each first through hole 20 is used to accommodate one frequency modulation unit 200. Therefore, as shown in the specific embodiment, the chamber 10 can simultaneously accommodate multiple frequency modulation units 200. The multiple frequency modulation units 200 are positioned and connected together on the cover plate 2, and the multiple frequency modulation units 200 are used together to adjust the frequency. Therefore, the filter 100 of this utility model can adjust and generate a wider frequency range and a broader band range.

[0044] Please refer to Figures 1 to 3 , Figure 15 and Figure 16 As shown, the frequency modulation unit 200 includes a first self-locking member 3, a second self-locking member 4, and an adjustment rod 5. Specifically, the adjustment rod 5 is adjusted and positioned on the cover plate 2 through the first self-locking member 3 and the second self-locking member 4. The adjustment rod 5, together with the corresponding first self-locking member 3 and the corresponding second self-locking member 4, constitutes a frequency modulation unit 200. Therefore, in specific embodiments, the filter 100 of this utility model includes multiple frequency modulation units 200.

[0045] Please refer to Figures 1 to 8 and Figures 15 to 17 As shown, the first self-locking member 3 is positioned on the cover plate 2 and at the first through hole 20. The first self-locking member 3 includes a first tooth 33 and a second through hole 30 extending vertically. It should be noted that in a preferred embodiment, the entire first self-locking member 3 is made of a non-metallic material; in other embodiments, at least the first tooth 33 is made of a non-metallic material. Therefore, the first self-locking member 3 is positioned with and can be separated from the cover plate 2. As is well known, the cover plate 2 is typically made of a metallic material. Therefore, when the first self-locking member 3 and the cover plate 2 are two independently configured and assembled as a single unit, the entire first self-locking member 3 can be made of a non-metallic material, thus ensuring that at least the first tooth 33 is made of a non-metallic material. The first self-locking member 3 extends downward through the first through hole 20 on the cover plate 2 and is positioned at the first through hole 20, making assembly simple and convenient.

[0046] Please refer to Figures 1 to 3 as well as Figures 9 to 17As shown, the second self-locking member 4 is connected to the first self-locking member 3 and located at the second through hole 30. The second self-locking member 4 includes a second tooth 43. The first tooth 33 and the second tooth 43 are connected by a toothed thread, and the second self-locking member 4 can move up and down relative to the first self-locking member 3. In a preferred embodiment, the second self-locking member 4 is entirely made of non-metallic material; in other embodiments, at least the second tooth 43 is made of non-metallic material. The second self-locking member 4 passes through the second through hole 30 on the first self-locking member 3 from top to bottom or from bottom to top and is positioned at the second through hole 30, making assembly simple and convenient. Since both the first self-locking member 3 and the second self-locking member 4 are formed of non-metallic material, when the adjusting rod 5 moves up and down with the second self-locking member 4, it is a toothed connection between non-metallic materials, avoiding the metal wire problem caused by the threaded movement in traditional structures, reducing manufacturing risks and lowering manufacturing costs.

[0047] Please refer to Figure 3 as well as Figures 9 to 16 As shown, the adjustment rod 5 is made of metal. It is fixed below the second self-locking member 4 and extends into the chamber 10. Therefore, as the second self-locking member 4 moves up and down relative to the first self-locking member 3, the depth of the adjustment rod 5 within the chamber 10 changes, thereby adjusting the frequency. It should be noted that the fixing between the adjustment rod 5 and the second self-locking member 4 can be done before or after the second self-locking member 4 penetrates the second through hole 30. In a specific embodiment, since the fixing between the adjustment rod 5 and the second self-locking member 4 can be done before the second self-locking member 4 penetrates the second through hole 30, after the adjustment rod 5 and the second self-locking member 4 are fixed, the second self-locking member 4 penetrates the second through hole 30 from bottom to top, avoiding the destructive effect caused by interference between the adjustment rod 5 and the first self-locking member 3, especially between the adjustment rod 5 and the first tooth 33.

[0048] Please refer to Figures 4 to 8As shown, the first self-locking member 3 also includes a hollow cylindrical main body 31. Specifically, the main body 31 has an upper opening 3101 and a lower opening 3102 arranged opposite to each other. The upper opening 3101 faces away from the cavity 10, and the lower opening 3102 faces the cavity 10. The second through hole 30 connects the upper opening 3101 and the lower opening 3102. The main body 31 also has an inner wall surface 311 and an outer wall surface 312 arranged opposite to each other. The first tooth 33 is located in the second through hole 30 and protrudes from the inner wall surface 311. This arrangement facilitates the toothed connection between the first tooth 33 and the second tooth 43. In a specific embodiment, since the first through hole 20 and the second through hole 30 are circular holes and the second through hole 30 is surrounded by the inner wall surface 311, the cross-sections of the inner wall surface 311 and the outer wall surface 312 are both circular, which facilitates vertical assembly. However, in other embodiments, the cross-sectional shape of the inner wall surface 311 and the outer wall surface 312 is not specified, and both the inner wall surface 311 and the outer wall surface 312 can be smooth surfaces.

[0049] Please refer to Figures 4 to 8 As shown, the first tooth 33 includes an integrally connected connecting root 331 and a vertical portion 333. The connecting root 331 is perpendicular to and connected to the inner wall surface 311, and the vertical portion 333 is parallel to and spaced from the inner wall surface 311. The first tooth pattern 330 is located on the vertical portion 333. This arrangement, with the first tooth pattern 330 on the vertical portion 333 and the vertical portion 333 parallel to and spaced from the inner wall surface 311, allows for an elastic retaining force when the first tooth pattern 330 and the second tooth 43 are connected, thus better positioning and holding the second self-locking member 4 on the first self-locking member 3.

[0050] Please continue to refer to Figures 4 to 8 And specifically refer to Figure 8 As shown, the first tooth 33 further includes a free end 334 formed at the end of the vertical portion 333 and spaced from the inner wall surface 311. The free end 334 makes the first tooth 33 elastic, so that the first tooth 33 can be biased towards the main body portion 31. It can also be understood that when both the upper and lower ends of the vertical portion 333 are connected to the inner wall surface 311 through the connecting root 331, as long as the vertical portion 333 is spaced from the inner wall surface 311, the vertical portion 333 has elastic force, but the elastic force of the vertical portion 333 is not good. The purpose of providing the free end 334 is to fully ensure the elastic force of the first tooth 33.

[0051] Please continue to refer to Figures 4 to 8 And specifically refer to Figure 8 and Figure 15 As shown, the first tooth 33 includes an arc-shaped guide portion 332, which connects the connecting root 331 and the vertical portion 333. The connecting root 331 and the arc-shaped guide portion 332 are located near the lower opening 3102, while the free end 334 is located near the upper opening 3101. This arrangement of the arc-shaped guide portion 332 between the connecting root 331 and the vertical portion 333, and its proximity to the lower opening 3102, provides upward guidance for the second self-locking member 4 when it penetrates the second through hole 30 from below. Furthermore, the proximity of the free end 334 to the upper opening 3101 facilitates adjustment. Specifically, adjustment only requires moving the free end 334 from the upper opening 3101, causing it to approach the inner wall surface 311, thus separating the first tooth 33 and the second tooth 43.

[0052] Please refer to Figure 8 As shown, the first through hole 20 and the second through hole 30 are circular holes with a radial direction. The diameter of the first through hole 20 is larger than the diameter of the second through hole 30, and the extension length of the connecting root 331 in the radial direction is less than 1 / 2 of the radius of the second through hole 30. This arrangement provides space for the second self-locking member 4 to penetrate the second through hole 30 from bottom to top.

[0053] Please refer to Figures 3 to 15 And specifically refer to Figure 15 As shown, each of the first tooth portions 33 has a plurality of first tooth patterns 330 and each of the second tooth portions 43 has a plurality of second tooth patterns 430, wherein the number of second tooth patterns 430 on each of the second tooth portions 43 is greater than the number of first tooth patterns 330 on each of the first tooth portions 33. With this configuration, the second tooth portions 43 can be exposed above the second through hole 30 through the upper opening 3101, and the second tooth portions 43 can be exposed below the second through hole 30 through the lower opening 3102.

[0054] Please refer to Figures 3 to 15 And specifically refer to Figure 8 and Figure 15As shown, the first tooth 33 and the second tooth 43 are a pair. The first teeth 330 on each first tooth 33 are spaced apart in the vertical direction, and the first teeth 330 on the pair of first teeth 33 are arranged face-to-face in the second through hole 30. The plurality of second teeth 430 on each second tooth 43 are spaced apart in the vertical direction, and the plurality of second teeth 430 on the pair of second teeth 43 are arranged back-to-back on the second self-locking member 4. With this arrangement, the first tooth 33 has a clamping effect on the second tooth 43 during engagement, ensuring the stability between the first tooth 33 and the second tooth 43.

[0055] Please refer to Figures 1 to 16 And specifically refer to Figure 15 and Figure 16 As shown, the first self-locking member 3 further includes a baffle 32 and a latching part 34 integrally connected to the main body 31. The baffle 32 is arranged around the main body 31 and abuts against the upper surface of the cover plate 2. The latching part 34 extends to the lower surface of the cover plate 2 and abuts against the baffle 32 on the upper and lower sides of the cover plate 2. This arrangement can stably lock the first self-locking member 3 onto the cover plate 2 and prevent it from being easily separated.

[0056] Please refer to Figures 1 to 17 And specifically refer to Figure 2 and Figure 17 As shown, the latching part 34 is disposed on the outer wall surface 312 and fits against the outer wall surface 312. The latching part 34 extends downward from the baffle 32 along the outer wall surface 312 to form a hook 340 close to the lower opening 3102. The hook 340 protrudes outward away from the outer wall surface 312. There is a pair of latching parts 34 and a pair of hooks 340. A pair of recesses 201 are provided on opposite sides of the first through hole 20. The pair of recesses 201 are used to allow the pair of latching parts 34 to pass through. By providing a pair of recesses 201, the first self-locking member 3 can be smoothly locked onto the cover plate 2.

[0057] The filter 100 of this utility model includes a cavity 1, a cover plate 2, a first self-locking component 3, a second self-locking component 4, and an adjustment rod 5. The specific assembly process of this utility model is as follows: the first self-locking component 3 is physically connected to the cover plate 2; the second self-locking component 4 and the adjustment rod 5 are assembled through a combination process; then, the first component containing the second self-locking component 4 and the adjustment rod 5, together with the second component containing the first self-locking component 3 and the cover plate 2, are assembled through the toothed structure between the first self-locking component 3 and the second self-locking component 4; finally, the third component containing the cover plate 2, the first self-locking component 3, the second self-locking component 4, and the adjustment rod 5 is assembled with the cavity 1.

[0058] During the debugging process, the filter 100 of this utility model achieves the required height by moving up and down relative to the second component of the first self-locking member 3 and the cover plate 2 together with the first component of the second self-locking member 4 and the debugging rod 5. The movement can be stopped at any time and self-locked at any time (self-locking is achieved by the cooperation of the first self-locking member 3 and the second self-locking member 4). This avoids the metal wire / problem caused by the up and down movement of the traditional structure through threaded engagement, reduces manufacturing risk and manufacturing cost.

[0059] Compared with the transmission thread structure, the filter 100 of this utility model can self-lock at any time after the adjustment rod 5 reaches the required position through the cooperation of the first self-locking part 3 and the second self-locking part 4, without the need for additional locking structure components, thus avoiding the problem of loose threads and improving the long-term stability of the product.

[0060] The first self-locking member 3 and the second self-locking member 4 of the filter 100 of this utility model are at least partially made of non-metallic materials; in a preferred embodiment, both the first self-locking member 3 and the second self-locking member 4 are entirely made of non-metallic materials, which can reduce product weight and lower material costs.

[0061] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. The understanding of the present utility model should be based on those skilled in the art. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. A filter characterized by: It includes: Cavity (1); A cover plate (2) is fitted onto the cavity (1) to form a chamber (10), the cover plate (2) having a first through hole (20) extending through in the vertical direction; The first self-locking member (3) is positioned on the cover plate (2) and located at the first through hole (20). The first self-locking member (3) includes a first tooth (33) and has a second through hole (30) that extends through in the vertical direction. A second self-locking member (4) is connected to the first self-locking member (3) and located at the second through hole (30). The second self-locking member (4) includes a second tooth (43). The first tooth (33) and the second tooth (43) are connected by a separable toothed thread. When the first tooth (33) and the second tooth (43) are separated, the second self-locking member (4) can move up and down relative to the first self-locking member (3). The adjustment rod (5) is fixed below the second self-locking member (4) and extends into the chamber (10).

2. The filter of claim 1, wherein: The first self-locking member (3) also includes a hollow cylindrical main body (31); The main body (31) has an upper opening (3101) and a lower opening (3102) arranged opposite to each other. The upper opening (3101) is away from the cavity (10) and the lower opening (3102) faces the cavity (10). The second through hole (30) connects the upper opening (3101) and the lower opening (3102). The main body (31) also has an inner wall surface (311) and an outer wall surface (312) arranged opposite to each other. The first tooth (33) is located in the second through hole (30) and protrudes from the inner wall surface (311).

3. The filter of claim 2, wherein: The first tooth (33) includes an integrally connected connecting root (331) and a vertical part (333). The connecting root (331) is perpendicular to and connected to the inner wall surface (311). The vertical part (333) is parallel to and spaced apart from the inner wall surface (311). The first tooth (33) has a plurality of first tooth patterns (330) and the first tooth patterns (330) are located on the vertical part (333).

4. The filter of claim 3, wherein: The first tooth (33) further includes a free end (334) formed at the end of the vertical portion (333) and spaced from the inner wall surface (311), the free end (334) giving the first tooth (33) elasticity so that the first tooth (33) can be biased toward the main body portion (31).

5. The filter of claim 4, wherein: The first tooth (33) includes an arc-shaped guide (332) that connects the connecting root (331) and the vertical part (333). The connecting root (331) and the arc-shaped guide (332) are closer to the lower opening (3102), and the free end (334) is closer to the upper opening (3101).

6. The filter of claim 3, wherein: The first through hole (20) and the second through hole (30) are circular holes with a radial direction. The diameter of the first through hole (20) is larger than the diameter of the second through hole (30). The extension length of the connecting root (331) in the radial direction is less than 1 / 2 of the radius of the second through hole (30).

7. The filter of claim 2, wherein: The first tooth portion (33) has a plurality of first tooth patterns (330) and the second tooth portion (43) has a plurality of second tooth patterns (430), wherein the number of second tooth patterns (430) on the second tooth portion (43) is greater than the number of first tooth patterns (330) on the first tooth portion (33).

8. The filter as described in claim 7, characterized in that: The first tooth (33) and the second tooth (43) are a pair. The first teeth (330) on each of the first teeth (33) are arranged at intervals in the vertical direction and the first teeth (330) on the pair of first teeth (33) are arranged face to face in the second through hole (30). The second teeth (430) on each of the second teeth (43) are arranged at intervals in the vertical direction and the second teeth (430) on the pair of second teeth (43) are arranged back to back on the second self-locking member (4).

9. The filter of claim 2, wherein: The first self-locking member (3) further includes a baffle (32) and a latching part (34) integrally connected to the main body (31). The baffle (32) is arranged around the main body (31) and abuts against the upper surface of the cover plate (2). The latching part (34) extends to the lower surface of the cover plate (2) and abuts against the baffle (32) on the upper and lower sides of the cover plate (2).

10. The filter of claim 9, wherein: The latching part (34) extends downward from the baffle (32) along the outer wall surface (312) to form a hook (340) close to the lower opening (3102). The hook (340) protrudes outward away from the outer wall surface (312). There is a pair of latching parts (34). A pair of recesses (201) are provided on opposite sides of the first through hole (20). The pair of recesses (201) are used to allow the pair of latching parts (34) to pass through.

11. The filter of claim 1, wherein: Both the first self-locking member (3) and the second self-locking member (4) are made of non-metallic materials.

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