An air filter

Abstract

The present invention discloses an air filter, including a filter element and a frame, wherein the frame includes two first frames arranged at intervals in front and back, the first frame includes a top frame and a bottom frame that can be interlocked with each other, the top frame and the bottom frame are rotatably connected by a rotating structure, and when the top frame and the bottom frame are in the interlocking state, the filter element is clamped and fixed between the top frame and the bottom frame. The present invention realizes a detachable connection between the filter element and the frame, and there is no need to replace the entire frame, and the frame can be reused to avoid waste; in addition, compared with existing products that are assembled by plugging and unplugging to achieve detachable connection, the rotatably connected top frame and bottom frame are engaged to clamp the filter element, which reduces the aiming link, makes disassembly more convenient, avoids the phenomenon of losing parts, and improves the overall connectivity and user experience; by installing the air filter of the present invention, users only need to order a separate filter element to achieve replacement, which greatly reduces the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of air filter screens, and in particular to an air filter screen. Background Art

[0002] As people's quality of life improves, the requirements for air quality are gradually becoming more important. Many buildings or household appliances are equipped with air purification devices or ventilation equipment. Since the air filter nets equipped on existing air purification and ventilation equipment are basically fixed to the frame by hot melting, when the filter element needs to be replaced, the frame is usually replaced as a whole set. This method of replacing the whole set has high production and maintenance costs in actual applications, and also causes great waste. For this reason, we have specially designed the present invention. Summary of the invention

[0003] In view of the problem mentioned in the background technology above that the existing equipment needs to replace the filter element together with the frame as a whole and has high use cost, the present invention provides an air filter with a recyclable frame, convenient filter element replacement and low cost.

[0004] In order to solve the above technical problems and achieve the above invention objectives, the present invention provides an air filter, including a filter element and a frame, the frame including two first frames arranged at a front and rear interval, the first frames including a top frame and a bottom frame that can be interlocked, the top frame and the bottom frame are rotatably connected via a rotating structure, and when the top frame and the bottom frame are in a buckled state, the filter element is clamped and fixed between the top frame and the bottom frame.

[0005] In one possible implementation manner, one end of the top frame is hinged to the bottom frame to form a hinged end, and the other end of the top frame is set as a free end, so that an open mode and a closed mode are formed between the top frame and the bottom frame; in the closed mode, the free end of the top frame is abutted against the bottom frame, and the top frame is snap-connected to the bottom frame via a snap-fit ​​structure to clamp the filter element; in the open mode, the free end of the top frame is separately set from the bottom frame.

[0006] In one possible implementation manner, the snap-fit ​​structure is an elastic sheet, a first groove is provided on the top frame, and a second groove is provided on the bottom frame, so that the second groove has a top and a bottom that are bent inward; the first end of the elastic sheet is snapped into the first groove, the second end of the elastic sheet is floatingly connected to the second groove, and the length of the elastic sheet is greater than the distance between the first groove and the second groove.

[0007] In the open mode, the elastic sheet bends downward, and the second end abuts against the bottom; in the closed mode, the elastic sheet bends upward, and the second end abuts against the top, and the top frame is constrained by the elastic sheet and buckled on the bottom frame.

[0008] In one possible implementation manner, the bottom frame is provided with an insertion cavity along its length direction, a first elastic member is installed in the insertion cavity, and the filter element is arranged between the first elastic member and the insertion cavity to clamp the filter element.

[0009] In one embodiment, the filter element includes a clamping portion arranged in the insertion cavity, and the clamping portion includes a side clamping section arranged between the side wall of the first elastic member and the insertion cavity and a bottom clamping section arranged between the bottom of the first elastic member and the insertion cavity.

[0010] In one possible implementation manner, the frame further includes two second frames spaced apart from each other on the left and right sides, and any first frame and the second frames on both sides are connected to each other via a connecting piece to form a shaping frame.

[0011] In one embodiment, a second elastic member is disposed inwardly on the side wall of the second frame, a clamping channel is formed between the two second elastic members, the filter element is placed in the clamping channel, and the filter element is disposed in contact with the second elastic member.

[0012] In one possible implementation manner, the second frame includes a clamping member, and the clamping member and the second frame are detachably arranged; when the clamping member is installed, the second elastic member is clamped by the clamping member to maintain a compressed state.

[0013] In one possible implementation manner, the filter element includes a stretching portion having a wavy structure in a longitudinal section, and the stretching portion can be stretched or compressed along a front-to-back direction.

[0014] In one possible embodiment, the filter element is configured as a multi-composite layer with supporting properties, including a planar air filter layer, a plastic mesh layer and / or a metal mesh layer.

[0015] Compared with the prior art, the air filter of the present invention has the following beneficial effects:

[0016] 1. The filter element can be fixed on the frame by fixing it on two first frames spaced apart from each other. The first frame includes a top frame and a bottom frame, which are rotatably connected and can be buckled with each other. The filter element is clamped and fixed in the buckled state, thereby realizing a detachable connection between the filter element and the frame. There is no need to replace the entire frame, and the frame can be reused to avoid waste. In addition, compared with existing products that are assembled by plugging and unplugging to achieve detachable connection, the rotatably connected top frame and bottom frame are buckled to clamp the filter element, which reduces the aiming link, makes disassembly more convenient, avoids the phenomenon of losing parts, and improves the overall connectivity and user experience. By installing the air filter of the present invention, users only need to order a separate filter element to achieve replacement, which greatly reduces the production cost.

[0017] 2. The first frame includes a top frame and a bottom frame, which are hinged to each other. When installing or removing the filter element, you only need to flip open the top frame and use it in conjunction with the snap-fit ​​structure. The installation and removal process can be achieved by opening and closing the free end and the bottom frame. The hinged connection method allows the top frame and the bottom frame to be snapped together as needed without alignment. It is easy to use and has high integrity without worrying about losing parts.

[0018] 3. An elastic sheet is provided as the source of the snapping force of the snapping structure, and the two ends of the elastic sheet are snapped on the top frame and the bottom frame respectively, and the length of the elastic sheet is greater than the spacing between the first groove and the second groove, so that the elastic sheet is bent to form an elastic torsion when opening or closing. When the top frame and the bottom frame are closed, the elastic sheet makes the top frame buckle on the bottom frame through tension to clamp the filter element, and the first frames arranged opposite to each other on both sides cooperate with each other to form a tensioning force, which can achieve the effect of fixing the filter element; wherein, by bending the top and bottom in the second groove inwardly, the possibility of the elastic sheet slipping off during the flipping and twisting process is greatly reduced;

[0019] 4. An insertion cavity is provided in the bottom frame, and a first elastic member is installed in the insertion cavity, so that the filter element is squeezed between the first elastic member and the inner wall of the insertion cavity, thereby achieving the effect of further fixing the filter element; and a clamping portion is provided on the filter element, and the clamping portion is further extended to form a bottom clamping section and a side clamping section, thereby lengthening the length and area of ​​the filter element subjected to the clamping force between the first elastic member and the inner wall of the insertion cavity, and also facilitating the insertion and installation between the filter element and the first frame;

[0020] 5. The first frame and the second frame are connected by a connector, so that the frame is detachable and customizable; the frame can add or adjust the first frame or the second frame according to product requirements to flexibly adapt to various sizes, and then be finalized and set by the connector;

[0021] 6. The two sides of the filter element are fixed to the first frame in a detachable manner. In order to further improve the fixing and clamping effect between the filter element and the frame, a second elastic member is arranged on two second frames arranged opposite to each other on the left and right sides, so that the filter element is subjected to the mutual rebound and extrusion of the second elastic members on both sides, thereby achieving fixation with the second frame, reducing the cumbersomeness of installation or removal with the second frame;

[0022] 7. Only the second elastic member is arranged on the side wall of the second frame. When the filter element is fixed to the first frame, the clamping member is removed, and the second elastic member rebounds to squeeze the filter element. Since the second frame is arranged opposite to each other on the left and right sides, the filter element is squeezed by the left and right sides. Under the combined support of the squeezing force on both sides, the filter element and the second frame can be locked. The structure is simple and easy to replace.

[0023] 8. The filter element is provided with a stretching part, and the longitudinal section of the stretching part is a wavy structure. When not in use, the filter element can be compressed to a smaller volume along the compression or stretching direction, which is convenient for transportation. When in use, the filter element can be stretched along the stretching direction to change the length. In addition, multiple standard folds can be produced according to specifications, and compressed filter elements can be purchased. When in use, the filter element can be stretched, compressed or cut according to the frame size, which can meet various size requirements, has wide adaptability, is easy to use, and has low cost.

[0024] 9. Compared with the soft filter paper of ordinary air filtration, the filter element in the present invention requires a certain support and extension force. By compounding a plastic or metal mesh or a plastic plus metal mesh with a certain support force on the filter paper, the support force of the filter paper can be further guaranteed, and it will not be blown down or deformed when passing through a large air volume pressure. It also has a certain strength when extruded with the second elastic member, and can be well fixed with the second elastic member;

[0025] Therefore, the present invention has the characteristics of frame reuse, simple disassembly, low cost and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall connection structure of the framework of Example 1 of the present invention;

[0027] Figure 2 It is a schematic diagram of the side view structure of the first side and the first frame installed in embodiment 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the side structure when the second side and the second frame of Embodiment 2 of the present invention are not installed;

[0029] Figure 4 For the present invention Figure 3 A magnified view of the three-dimensional structural details;

[0030] Figure 5 A schematic side view of the structure of the second side and the second frame installed in Embodiment 2 of the present invention;

[0031] Figure 6 For the present invention Figure 5 A magnified view of the three-dimensional structural details;

[0032] Figure 7 This is a schematic diagram of the multi-composite layer structure of the filter element of Example 2 of the present invention;

[0033] Figure 8 It is a side structural schematic diagram of the installation process of the first side and the first frame of Embodiment 3 of the present invention;

[0034] Fig. 9 This is a schematic diagram of the overall structure of the installation process of extracting the card firmware according to Embodiment 3 of the present invention;

[0035] Fig.10 This is an overall diagram of the air filter device of Example 3 of the present invention;

[0036] In the figure: 1. filter element, 2. first side, 3. frame, 4. first frame, 5. second frame, 6. connecting piece, 7. top frame, 8. bottom frame, 9. elastic sheet, 10. first groove, 11. second groove, 12. insertion cavity, 13. first elastic piece, 14. left inner wall, 15. right inner wall, 16. second side, 17. second elastic piece, 18. clamping piece, 19. protrusion, 20. placement part, 21. edge sealing part, 22. side clamping section, 23. bottom clamping section, 24. top, 25. bottom. DETAILED DESCRIPTION

[0037] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] In the following embodiments, the terms "front", "rear", "left" and "right" are used and described based on the relative positions of the overall filter element in the accompanying abstract.

[0039] Embodiment 1:

[0040] Figure 1 to Figure 2 An embodiment of an air filter of the present invention is shown, including a filter element 1 and a frame 3. In this scheme, the filter element 1 and the frame 3 are both rectangular shapes with the highest frequency of conventional use. The filter element 1 includes two oppositely arranged first sides 2 and two oppositely arranged second sides 16. The frame 3 includes two first frame sides 4 arranged at intervals in front and back and two second frame sides 5 arranged at intervals in left and right. The first side 2 is detachably connected to the first frame side 4, and the second side 16 and the side wall of the second frame side 5 are squeezed against each other by a second elastic member 17, so as to realize the detachable installation of the filter element 1 and the frame 3.

[0041] In this scheme, if Figure 1 As shown, the first frame 4 and the second frame 5 are connected to each other by a connecting piece 6 to form a fixed frame. Therefore, in actual customization, the number of first frames 4 or second frames 5 can be increased according to needs to achieve multi-frame splicing, wherein the connecting piece 6 connecting the first frame 4 and the second frame 5 is a standard connecting piece 6 in the industry, such as an angle code.

[0042] In this scheme, if Figure 2As shown, the first frame 4 includes a top frame 7 and a bottom frame 8, and the top frame 7 and the bottom frame 8 are rotatably connected and can be interlocked. One end of the top frame 7 is hinged with the bottom frame 8 to form a hinged end, and the other end of the top frame 7 is set as a free end, and an open mode and a closed mode are formed between the top frame 7 and the bottom frame 8; in the closed mode, the free end is against the bottom frame 8, and the top frame 7 is connected to the bottom frame 8 by a snap-fit ​​structure, and the first side of the filter element 1 is clamped between the top frame 7 and the bottom frame 8; in the open mode, the free end of the top frame 7 is separated from the frame.

[0043] In this solution, a first groove 10 is provided on the top frame 7, and a second groove 11 is provided on the bottom frame 8. An elastic sheet 9 is engaged in the first groove 10 and the second groove 11. The first end of the elastic sheet 9 is engaged in the first groove 10, and the second end of the elastic sheet 9 is floatingly connected to the second groove 11. As the top frame 7 opens and closes, one end of the elastic sheet 9 is driven by the top frame 7 and the other end is engaged in the second groove 11. The length of the elastic sheet 9 is set to be greater than the spacing between the first groove 10 and the second groove 11, so that when the top frame 7 and the bottom frame 8 are closed, the elastic sheet 9 is squeezed and presents an arc shape. When the top frame 7 is rotated and opened relative to the bottom frame 8, the elastic sheet 9 flips with the second groove 11 as a fulcrum and presents an inverted arc shape, thereby realizing the elastic opening and closing between the top frame 7 and the bottom frame 8.

[0044] Furthermore, in this solution, the second groove 10 is provided with a top 24 and a bottom 25 bent inwardly, that is, in the open mode, the elastic sheet 9 is bent downwardly, and the second end is against the bottom 25; in the closed mode, the elastic sheet 9 is bent upwardly, and the second end is against the top 24, and the top frame 7 is restrained by the elastic sheet 9 and buckled on the bottom frame 8. By switching between the open and closed modes, the second end of the elastic sheet 9 slides in the second groove 11, forming a floating connection with the second groove 11. In this solution, the top 24 and the bottom 25 are both free ends of the second groove 11 bent inwardly, which can effectively prevent the second end of the elastic sheet 9 from slipping during the flipping process of bending inwardly and bending outwardly, forming a limit for the second end.

[0045] It should be further explained that, in the present solution, the first end of the elastic sheet 9 and the first groove 10 can be either fixedly connected or movably connected. In the case of a movably connected connection, the first groove 10 should be set to a narrow gap so that the first end can be driven by the top frame 7 without slipping. In the case of a fixed connection, as long as the second end can maintain the above-mentioned active state, the technical means in the present solution can still be effectively implemented.

[0046] It should be noted that a space needs to be reserved between the elastic sheet 9 and the top frame 7 for the elastic sheet 9 to be turned over, that is, a space is reserved for the elastic sheet 9 to bend upward; therefore, the top frame 7 also includes a protrusion 19 protruding downward, and the first groove 10 is provided on the protrusion 19. When the top frame 7 is closed, it is pressed together with the bottom frame 8 through the protrusion 19.

[0047] In this solution, the bottom frame 8 is provided with an insertion cavity 12 along its length direction, and a first elastic member 13 is installed in the insertion cavity 12. One end of the first elastic member 13 is fixed to the left inner wall 14 of the insertion cavity 12, and the other end is a free end squeezed by the right inner wall 15 of the insertion cavity 12. The first side 2 of the filter element 1 is placed between the first elastic member 13 and the right inner wall 15 of the insertion cavity to clamp and fix the first side 2.

[0048] In order to further increase the connectivity between the filter element 1 and the first frame 4, the first edge 2 in the present embodiment includes a clamping portion arranged in the insertion cavity 12, and the clamping portion includes a side clamping section 22 arranged on the side wall of the first elastic member 13 and the right inner wall 15, and a bottom clamping section 23 arranged on the bottom of the first elastic member 13 and the insertion cavity 12, so as to increase the clamping length and area, and make the overall structure more fit.

[0049] In this solution, the first elastic member 13 is sealing cotton.

[0050] Embodiment 2:

[0051] Based on Example 1, Example 2 further improves the connection between the second side 16 and the second frame 5 .

[0052] like Figure 3 , Figure 4 As shown, the side wall of the second frame 5 is provided with a second elastic member 17 facing inward, and a clamping channel is formed between the two second elastic members 17 . The filter element 1 is placed in the clamping channel, and the filter element 1 is abutted against the second elastic member 17 .

[0053] In this solution, the second elastic member 17 can be fixed in a compressed state by a clamping member 18, and the clamping member 18 is detachably arranged to realize compression and rebound of the second elastic member 17; when the clamping member 18 is installed on the second frame 5, the second elastic member 17 is clamped between the clamping member 18 and the side wall of the second frame 5 to maintain the compressed state of the second elastic member 17; when the clamping member 18 is separated from the second frame 5, the second elastic member 17 rebounds, and when the first side 2 is fixed, the second side 16 is locked with the second frame 5 through the rebound extrusion of the second elastic members 17 arranged opposite to each other on both sides.

[0054] In this scheme, if Figure 5 As shown, the clamping member 18 is a U-shaped clamping member, and the second frame 5 is provided with at least a mounting groove for the clamping member 18 to be installed, or the second frame 5 is provided with the same structure as the first frame 4, so that the clamping member 18 is clamped on the inner wall of the insertion cavity 12 of the bottom frame 8. The second elastic member 17 is provided to facilitate the installation and removal of the filter element 1 and the frame 3, avoiding the tediousness of the first frame 4 and the second frame 5 needing to be aligned and plugged in in other prior arts, while still having the effect of clamping, fixing and sealing.

[0055] In this scheme, if Figure 6 and Figure 7 As shown, the filter element 1 includes a stretching portion with a wavy structure in the longitudinal section, and the stretching portion can be stretched or compressed along the front-to-back direction;

[0056] Furthermore, the entire filter element 1 can be set as a stretching portion, that is, the longitudinal section of the second side 16 is a W-shaped structure, such as a shutter type or a folding fan type that can be folded back and forth on the front and back, so that the filter element 1 can be stretched or compressed along the length direction of the second side 16 to change the distance between the two first sides 2.

[0057] In practical applications, the number of folds of the filter element 1 can be specified according to the specifications of common sizes, and the number of folds can be divided into several standards. When in use, the filter element 1 with different folds can be customized according to the size of the frame 3. After stretching, the longitudinal section of the second side 16 is formed into a W-shaped unfolded surface, which can adapt to various size requirements, be flexibly adjusted, and is easy to transport. In addition, the W-shaped structure increases the contact surface between the second side 16 and the second elastic member 17, thereby improving the stability of the installation of the filter element 1.

[0058] It should be understood that the length of the first side 2 can be cut according to the actual size of the frame 3 .

[0059] In this solution, the bottom frame 8 further includes a placement portion 20 , which is located at the bottom of the bottom frame 8 and is used to place the second elastic member 17 and the filter element 1 to improve the stability of the filter element 1 .

[0060] Furthermore, in order to improve the overall strength and supporting performance of the filter element 1, the filter element 1 is configured as a multi-composite layer with supporting performance, such as a planar air filter layer and a plastic mesh layer composite, or a planar air filter layer and a metal mesh layer composite, or a planar air filter layer, a plastic mesh layer and a metal mesh layer composite.

[0061] In this solution, the second elastic member 17 is sealing cotton. The use of sealing cotton enables the first elastic member 13 and the second elastic member 17 to have not only the extrusion function brought by elasticity, but also the sealing function, so as to better fill the gap between the filter element 1 and the frame 3.

[0062] The rest are the same as those in the above-mentioned embodiment 1 and will not be described in detail here.

[0063] Embodiment 3:

[0064] In this embodiment 3, based on the above-mentioned embodiment 1 or embodiment 2, the structure of the top frame 7 is further improved to form the following Figure 8 The frame 3 structure shown.

[0065] A sealing edge portion 21 is also provided on the top frame 7. The sealing edge portion 21 continues to extend from the position of the protrusion 19 toward the filter element 1. The sealing edge portion 21 cooperates with the protrusion 19 to increase the distance between the sealing edge portion 21 and the bottom frame 8, thereby providing sufficient space between the second elastic member 17 and the height of the filter element 1. The setting of the sealing edge portion 21 also limits the side height of the filter element 1, thereby maintaining overall stability between the first frame 4 and the second frame 5 and the filter element 1, and also improving the aesthetics of the filter element 1 when it is installed on the frame 3.

[0066] Through the implementation of this solution, the overall structural diagram of the filter element can be as follows: Fig. 9 and Fig.10 shown.

[0067] The rest are the same as those in the above embodiment and will not be described in detail here.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air filter, characterized in that: The invention comprises a filter element (1) and a frame (3), wherein the frame (3) comprises two first frame frames (4) arranged at a front-rear interval, wherein the first frame frame (4) comprises a top frame (7) and a bottom frame (8) which can be buckled with each other, wherein the top frame (7) and the bottom frame (8) are rotatably connected via a rotating structure, and when the top frame (7) and the bottom frame (8) are buckled with each other, the filter element (1) is clamped and fixed between the top frame (7) and the bottom frame (8); One end of the top frame (7) is hinged to the bottom frame (8) to form a hinged end, and the other end of the top frame (7) is a free end, so that an open mode and a closed mode are formed between the top frame (7) and the bottom frame (8); in the closed mode, the free end of the top frame (7) abuts against the bottom frame (8), and the top frame (7) is connected to the bottom frame (8) by a snap-fit ​​structure to clamp the filter element (1); in the open mode, the free end of the top frame (7) is separated from the bottom frame (8); The engaging structure is an elastic sheet (9), a first groove (10) is provided on the top frame (7), and a second groove (11) is provided on the bottom frame (8), so that the second groove (11) is provided with a top (24) and a bottom (25) bent inwardly; the first end of the elastic sheet (9) is engaged in the first groove (10), the second end of the elastic sheet (9) is floatingly connected to the second groove (11), and the length of the elastic sheet (9) is greater than the distance between the first groove (10) and the second groove (11); In the open mode, the elastic sheet (9) bends downward, and the second end abuts against the bottom (25); in the closed mode, the elastic sheet (9) bends upward, and the second end abuts against the top (24), and the top frame (7) is constrained by the elastic sheet (9) and buckled onto the bottom frame (8); The bottom frame (8) is provided with an insertion cavity (12) along its length direction, a first elastic member (13) as sealing cotton is installed in the insertion cavity (12), and the filter element (1) is arranged between the first elastic member (13) and the insertion cavity (12) to clamp the filter element (1).

2. The air filter according to claim 1, characterized in that: The filter element (1) comprises a clamping portion arranged in the insertion cavity (12), and the clamping portion comprises a side clamping section (22) arranged between the side wall of the first elastic member (13) and the insertion cavity (12), and a bottom clamping section (23) arranged between the bottom of the first elastic member (13) and the insertion cavity (12).

3. The air filter according to claim 1 or 2, characterized in that: The frame (3) further comprises two second frame frames (5) spaced apart from each other on the left and right sides, and any of the first frame frames (4) and the second frame frames (5) on both sides are connected to each other via connecting pieces (6) to form a shaping frame.

4. The air filter according to claim 3, characterized in that: A second elastic member (17) is arranged inwardly on the side wall of the second frame (5), a clamping channel is formed between the two second elastic members (17), the filter element (1) is placed in the clamping channel, and the filter element (1) is arranged in abutment with the second elastic member (17).

5. The air filter according to claim 4, characterized in that: The second frame (5) comprises a clamping piece (18), and the clamping piece (18) and the second frame (5) are detachably arranged; when the clamping piece (18) is in an installed state, the second elastic piece (17) is clamped by the clamping piece (18) to maintain a compressed state.

6. The air filter according to claim 4 or 5, characterized in that: The filter element (1) comprises a stretching portion with a wavy structure in the longitudinal section, and the stretching portion can be stretched or compressed in the front-to-back direction.

7. The air filter according to claim 6, characterized in that: The filter core (1) is configured as a multi-composite layer with supporting performance, comprising a planar air filter layer, a plastic mesh layer and a metal mesh layer.

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