Air filter

Abstract

The utility model belongs to the technical field of motor vehicles and air filters, and particularly relates to an air filter. The air filter comprises a shell and further comprises an air inlet pipe and an exhaust pipe which are connected to the shell. A filter element is arranged in the shell and divides the inner space of the shell into an air inlet cavity and an air outlet cavity. The shell comprises a first filter shell and a second filter shell which are in butt joint, a first butt joint edge is arranged at an opening of the first filter shell, and a second butt joint edge is arranged at an opening of the second filter shell; the filter element comprises a filter element with a certain thickness and a sealing frame body arranged along the edge of the filter element, and the sealing frame body has elasticity; when the first filter shell and the second filter shell are in a butt joint state, the sealing frame body is pressed and fixed between the first butt joint edge and the second butt joint edge. The air filter provided by the utility model has excellent sealing performance and stability, and can effectively block tiny particulate matters, reduce the abrasion of foreign matters to internal parts of an engine and prolong the service life of the engine.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor vehicles and air filters, and specifically relates to an air filter. Background Art

[0002] With the rapid development of the automobile industry, the optimization and improvement of automobile engine performance has become the focus of major automobile manufacturers and parts suppliers. As the heart of the car, the engine's working efficiency and service life depend to a large extent on the quality of the air it inhales. Unfiltered or poorly filtered air carries dust, moisture, and other tiny particles, which not only reduces the combustion efficiency of fuel and increases emission pollution, but also seriously wears out the precision parts inside the engine, such as the cylinder wall, piston, piston ring, etc., resulting in reduced engine performance, increased maintenance costs, and shortened overall engine life.

[0003] Although traditional air filters basically meet the needs of air filtration and engine supply of clean air, there are still some shortcomings in practical applications. On the one hand, these filters are often not ideal in terms of sealing, especially in harsh environments, such as strong airflow impact caused by high-speed driving, frequent vibration under complex road conditions, dusty or humid environments, etc., there is a risk that the insufficiently filtered air will partially pass through the gaps in the shell, affecting the filtering effect. On the other hand, the air filter needs to be arranged in a specific position in the engine compartment. The installation space is compact and irregular, which is not convenient for installation and disassembly, and is not conducive to daily maintenance and regular replacement of the filter element.

[0004] In view of this, developing an air filter with a more reasonable structure, excellent sealing performance, easy maintenance and adaptability to complex working conditions is of great practical significance for meeting the high requirements of modern automobile engines for air quality and promoting technological progress in the automobile industry. Utility Model Content

[0005] Aiming at the deficiencies in the prior art, the utility model provides an air filter.

[0006] The air filter provided by the utility model comprises a shell, and also comprises an air inlet pipe and an air outlet pipe connected to the shell; a filter element is arranged in the shell to divide the internal space of the shell into an air inlet chamber and an air outlet chamber; the air inlet pipe is communicated with the air inlet chamber to introduce the air to be filtered into the air inlet chamber; the air outlet pipe is communicated with the air outlet chamber to lead out the air entering the air outlet chamber after being filtered by the filter element; the shell comprises a first filter shell and a second filter shell which are butt-jointed, and a first butt-jointed edge is provided at the opening of the first filter shell, and a second butt-jointed edge is provided at the opening of the second filter shell; the filter element comprises a filter element with a certain thickness and a sealing frame arranged along the edge of the filter element, and the sealing frame is elastic; when the first filter shell and the second filter shell are in a butt-jointed state, the sealing frame is pressed and fixed between the first butt-jointed edge and the second butt-jointed edge.

[0007] As a further optimization, the sealing frame is formed in situ and bonded to the edge of the filter element.

[0008] In addition, the sealing frame can also be a prefabricated part and bonded to the edge of the filter element with an adhesive.

[0009] As a further optimization solution, a reinforcement network is formed on one side of the filter element and in the area surrounded by the sealing frame, and the reinforcement network is integrally connected to the sealing frame at the edge.

[0010] As a further optimization solution, the strengthening network is composed of a number of hexagonal network units continuously spread on the surface of the filter element, and through pores are formed in each network unit.

[0011] As a further optimization solution, a sunken supporting step is formed on the inner side of the first butt joint edge and along the extension direction of the first butt joint edge, and a bearing surface is formed on the outer periphery of the sealing frame, and the bearing surface is adapted to the end surface of the supporting step.

[0012] As a further optimization scheme, an annular sealing groove is formed on the second docking edge and on the side facing the first docking edge, and an annular sealing flange is integrally formed on the sealing frame and on the side facing the second docking edge. When the first docking edge is docked with the second docking edge, the sealing flange adaptively elastically deforms under the pressure of the sealing groove and fills the sealing groove.

[0013] As a further optimization scheme, a group of threaded holes are formed on the end face of the first butt joint edge, and a group of through holes penetrating the sealing groove are provided on the second butt joint edge. A group of fasteners pass through the through holes and are fastened in the threaded holes to fasten the first butt joint edge to the second butt joint edge.

[0014] As a further optimization solution, the first butt joint edge is located above the second butt joint edge, and the fastener is located outside the sealing flange.

[0015] As a further optimization solution, the filter element is a paper filter element or a non-woven filter element.

[0016] Beneficial Effects

[0017] The air filter provided by the utility model can effectively block tiny particles, ensure that the air entering the engine is highly clean, reduce the wear of foreign matter on the internal parts of the engine, and extend the service life of the engine.

[0018] The air filter provided by the utility model has a sealing frame on the periphery of the filter element matched with the shell to ensure the sealing connection of the filter element under different working conditions, prevent the infiltration of unfiltered air, and ensure the filtering efficiency and safe operation of the engine.

[0019] The air filter provided by the utility model has an integrated reinforcement network which not only enhances the mechanical strength of the filter element, but also effectively prevents the filter element from being deformed or damaged when facing high-pressure airflow or vibration environment, thereby further ensuring the sealing of the extended filter element.

[0020] The air filter provided by the utility model has a double-shell docking structure, and the cooperation between the supporting step and the bearing surface, the sealing groove and the sealing flange allows the user to easily disassemble and reassemble the air filter without professional tools, which is convenient for regular inspection of the filter element condition and timely maintenance, while also ensuring the correct position of the filter element to prevent displacement due to vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 , Figure 2 A schematic diagram of the air filter structure.

[0022] Figure 3 Schematic diagram of the explosion inside the air filter housing.

[0023] Figure 4 Schematic diagram of the structure of the filter element.

[0024] Figure 5 It is an exploded schematic diagram of the first butt joint edge and the second butt joint edge.

[0025] Figure 6 It is a schematic diagram of assembling the first butt joint edge and the second butt joint edge.

[0026] Figure 7 It is a schematic diagram of the structure of the buffer connection component on the shell.

[0027] Figure 8 , Fig. 9 and Fig.10 It is a schematic structural diagram of the first connecting buckle group.

[0028] Fig.11 and Fig.12 It is a schematic structural diagram of the second connecting buckle group.

[0029] In the figure: 1, housing; 2, air inlet pipe; 3, exhaust pipe; 4, filter element; 5, first connecting buckle group; 6, second connecting buckle group; 11, first filter housing; 12, second filter housing; 13, fastener; 41, filter element; 42, sealing frame; 43, strengthening network; 51, plug rod; 52, elastic sleeve pad; 53, support ear; 61, elastic snap ring; 62, rigid bushing; 63, locking piece; 111, first docking edge Edge; 121, second docking edge; 421, bearing surface; 422, sealing flange; 511, rod body; 512, anti-slip portion; 513, auxiliary block; 514, thickness reduction groove; 521, plug hole; 522, limit slot; 611, central accommodating hole; 612, annular slot; 613, pressure buffer block; 1111, supporting step; 1112, threaded hole; 1211, sealing groove; 1212, through hole. DETAILED DESCRIPTION

[0030] The air filter is a key component used in automobile engines. Its main function is to filter the air entering the engine and filter out foreign matter such as dust, sand, and water vapor in the air to protect the engine from damage by foreign matter. When the engine is running, a large amount of clean air is required for combustion, but the air often carries various impurities. If these impurities enter the engine, it will cause wear of components such as the cylinder block, piston rings, and crankshaft, seriously affecting the service life and performance of the engine. Therefore, it is necessary to install an air filter on the engine intake line.

[0031] The air filter of the utility model has a structure as follows Figure 1 and Figure 2 As shown, it includes a housing 1, and also includes an air inlet pipe 2 and an air outlet pipe 3 connected to the housing 1. Figure 3 As shown, a filter element 4 is provided in the shell 1 to divide the internal space of the shell 1 into an air inlet chamber and an air exhaust chamber; the air inlet pipe 2 is connected to the air inlet chamber to introduce the air to be filtered into the air inlet chamber; the air exhaust pipe 3 is connected to the air exhaust chamber to discharge the air that enters the air exhaust chamber after being filtered by the filter element 4.

[0032] The above-mentioned air filter is mainly used to supply clean, impurity-free air to the automobile engine, thereby ensuring the efficient and stable operation of the engine and extending its service life. Its working process is as follows:

[0033] Air intake stage: When the engine is running, a large amount of air is required to participate in combustion; the intake pipe 2 is located at the front end of the air filter and inhales air from the external environment. This air may carry various impurities, such as dust, sand, water vapor, etc.

[0034] Filtration stage: The inhaled air then enters the air intake chamber in the housing 1 through the air intake pipe 2, and then passes through the filter element 4; the filter element 4 can effectively intercept and capture tiny particles in the air, allowing clean air to pass through and enter the exhaust chamber.

[0035] Air discharge stage: The air purified by the filter element 4 enters the exhaust chamber. The exhaust pipe 3 is connected to the exhaust chamber to guide the clean air out and transport it to the next component, usually directly into the intake manifold of the engine, or in a turbocharged vehicle, into the turbocharger to increase the pressure before entering the engine.

[0036] like Figure 3 As shown, the housing 1 comprises a first filter housing 11 and a second filter housing 12 which are butt-jointed, and the first filter housing 11 has a first butt joint edge 111 at the opening, and the second filter housing 12 has a second butt joint edge 121 at the opening. Figure 4 As shown, it includes a filter element 41 with a certain thickness and a sealing frame 42 arranged along the edge of the filter element 41, and the sealing frame 42 is elastic; when the first filter housing 11 and the second filter housing 12 are in a docking state, the sealing frame 42 is pressed and fixed between the first docking edge 111 and the second docking edge 121.

[0037] The housing 1 is composed of a first filter housing 11 and a second filter housing 12 that are docked, so that the filter can be easily disassembled to replace or clean the filter element 41, thereby improving the convenience of maintenance. The user can regularly check or replace the filter element 41 without damaging the overall structure to ensure that the engine continues to obtain clean air. The first docking edge 111 and the second docking edge 121 are used for the tight connection between the first filter housing 11 and the second filter housing 12. The sealing frame 42 is located at the edge of the filter element 41 and is elastic. When the two filter housings are docked, the sealing frame 42 is squeezed on both sides and adaptively deformed to form a reliable sealing contact interface to prevent unfiltered air from bypassing the filter element 41 and directly entering the engine, thereby ensuring the filtering effect.

[0038] Preferably, the filter element 41 is a paper filter element or a non-woven fabric filter element.

[0039] Preferably, the sealing frame 42 is made of rubber, silicone, polyurethane and other materials, and has good elasticity and weather resistance. The sealing frame 42 can be prefabricated and installed on the edge of the filter element 41 by assembly, pasting and other methods, and is preferably combined with the edge of the filter element 41 by in-situ molding. In-situ molding allows the sealing frame 42 to be formed and fixed directly at the specified position of the filter element 41, which can achieve more precise size control and stronger bonding strength, reduce the possibility of gaps or looseness introduced by the assembly process, and thus improve the manufacturing accuracy and reliability of the entire filter.

[0040] As a further improvement, a reinforcement network 43 is formed on one side of the filter element 41 and in the area surrounded by the sealing frame 42. The reinforcement network 43 is integrally connected to the sealing frame 42 at the edge. Figure 4 The basic hexagonal structural unit shown is composed of a number of hexagonal network units continuously spread on the surface of the filter element 41, and through pores are formed in each network unit. The reinforced network 43 can also be formed by combining basic structural units of other shapes such as rectangles, triangles, and diamonds. The reinforced network 43 improves the mechanical strength and stability of the filter element 41 by forming a reinforcement structure on the surface of one side of the filter element 41. Especially when the filter element 41 is made of a relatively soft material or needs to withstand a higher airflow pressure, the reinforced network 43 can prevent the filter element 41 from being deformed or damaged due to air pressure difference or vibration, prevent the filter element 41 from affecting the sealing due to deformation, and also help to extend the service life of the filter element 41.

[0041] like Figure 5 and Figure 6 As shown, a sunken support step 1111 is formed inside the first docking edge 111 and along the extension direction of the first docking edge 111, and a bearing surface 421 is formed on the periphery of the sealing frame 42, and the bearing surface 421 is adapted to the end surface of the support step 1111. The support step 1111 is located inside the first docking edge 111 and extends along the edge, forming a supporting structure that accurately matches the sealing frame 42. When the two parts of the filter housing are docked and closed, the bearing surface 421 of the sealing frame 42 can be firmly seated on the end surface of the support step 1111, which is convenient for the filter element 4 to be accurately positioned during assembly, and also prevents the filter element 4 from shifting due to vibration during the driving of the vehicle. At the same time, the bearing surface 421 of the sealing frame 42 is in close contact with the end surface of the support step 1111, and also has a certain effect of blocking air from penetrating from the edge.

[0042] An annular sealing groove 1211 is formed on the second butt joint edge 121 and is located on one side facing the first butt joint edge 111. An annular sealing flange 422 is integrally formed on the sealing frame 42 and is located on one side facing the second butt joint edge 121. When the first butt joint edge 111 and the second butt joint edge 121 are butt-jointed and closed, the sealing flange 422 is elastically deformed adaptively under the pressure of the sealing groove 1211 and filled in the sealing groove 1211. The sealing groove 1211 cooperates with the sealing flange 422, and the sealing flange 422 is elastically deformed to be close to the inner wall of the sealing groove 1211, forming a tight sealing interface, effectively preventing unfiltered air from penetrating into the exhaust cavity from the edge gap of the housing 1, and maintaining the effectiveness of air filtration and the safety of engine operation. In addition, the cooperation of the sealing flange 422 and the sealing groove 1211 also increases the stability of the filter element 4 inside the housing 1, and even if vibration or air pressure fluctuation occurs during the driving of the vehicle, the filter element 4 can be effectively prevented from deflecting or loosening.

[0043] A group of threaded holes 1112 are formed on the end surface of the first butt joint edge 111, and a group of through holes 1212 penetrating the sealing groove 1211 are provided on the second butt joint edge 121. A group of fasteners 13, such as screws, are passed through the through holes 1212 and fastened in the threaded holes 1112 to fasten the first butt joint edge 111 and the second butt joint edge 121 together, thereby generating a strong pressing force to prevent the first butt joint edge 111 and the second butt joint edge 121 from loosening and affecting the sealing effect.

[0044] Preferably, the first butt joint edge 111 is located above the second butt joint edge 121, so that the notch of the sealing groove 1211 faces downward to avoid water or dust accumulation in the notch affecting the durability of the sealing frame 42. In addition, the fastener 13 is preferably arranged on the outside of the sealing flange 422 to avoid the fastener 13 causing the sealing of the inner cavity of the housing 1.

[0045] The following describes the connection between the air filter and the engine compartment.

[0046] The housing 1 of the air filter is used as an installation object, and the engine compartment is used as an installation carrier. The housing 1 is installed in the engine compartment through a set of buffer connection components.

[0047] like Figure 7 As shown, the buffer connection assembly is attached to the installation object and is used to fix the installation object on the installation carrier, and includes at least one first connection buckle group 5 and at least one second connection buckle group 6. The first connection buckle group 5 and the second connection buckle group 6 cooperate to achieve buffering and firm connection of the connection part between the air filter and the engine compartment.

[0048] The first connecting buckle group 5 is as follows Figure 8 , Fig. 9 and Fig.10 As shown, the first connecting buckle group 5 includes an insertion rod 51 arranged on the installation object and an elastic sleeve pad 52 arranged on the installation carrier; the insertion rod 51 has a rod body 511 and an anti-slip portion 512 located at the end of the rod body 511; a through-hole 521 is formed on the elastic sleeve pad 52; when the insertion rod 51 and the elastic sleeve pad 52 are assembled, the rod body 511 passes through the socket 521 and is confined in the socket 521. The elastic sleeve pad 52 is elastic and can provide strong friction resistance after the insertion of the insertion rod 51. In combination with the anti-slip portion 512, the insertion rod 51 is not easy to fall off from the elastic sleeve pad 52, thereby ensuring the stability of the connection. During the operation of the vehicle, the force generated by road bumps or engine vibrations can be absorbed and dispersed by the elastic sleeve pad 52, thereby reducing the impact directly transmitted to the housing 1 and protecting the filter from severe vibration.

[0049] The insertion hole 521 passes through the elastic sleeve 52 from top to bottom, and the top of the insertion hole 521 is trumpet-shaped to form a guiding structure. When the insertion rod 51 approaches the insertion hole 521, the trumpet-shaped opening can easily receive and guide the rod body 511 and the anti-slip portion 512 located at the end of the rod body 511 to pass through. Even in the case of poor visibility or limited operating space, the insertion rod 51 can be easily aligned and smoothly inserted into the insertion hole 521.

[0050] The elastic sleeve 52 has an annular limiting groove 522 on its circumference for assembling the elastic sleeve 52 on the mounting carrier, so that the elastic sleeve 52 can be conveniently and firmly fixed on the mounting carrier.

[0051] The plug rod 51 is arranged vertically and is integrally formed on the support ear 53, and the support ear 53 is arranged on the installation object. The plug rod 51 and the support ear 53 are integrally formed to ensure the connection strength, which helps to withstand stronger vibration and impact.

[0052] An auxiliary block 513 for connecting the lug 53 is provided at the root of the shaft 511, and the auxiliary block 513, the lug 53 and the shaft 511 are integrally formed and connected together. The auxiliary block 513 has a tapered outer profile, and a plurality of thickness reduction grooves 514 are formed on one side surface. By providing the auxiliary block 513 and arranging the thickness reduction grooves 514 on the auxiliary block 513, not only the connection strength between the shaft 511 and the lug 53 is strengthened, but also the shrinkage and deformation of the surface of the lug 53 caused by the excessive thickness of the auxiliary block 513 during the injection molding process is avoided. Specifically, during the injection molding process, the plastic material cools and solidifies from the molten state, and the volume shrinks. If this shrinkage is unevenly distributed, it may cause deformation of the product, such as distortion, depression or surface defects. Especially in areas where the wall thickness of the product varies greatly, such as relatively thick parts such as the auxiliary block 513, the internal cooling rate during the cooling process is usually slower than that of the thin-walled part, resulting in large internal residual stress, which is easy to cause local deformation and affect the appearance and assembly accuracy. The thickness-reducing groove 514 is essentially formed by digging out a portion of material from the thick part of the auxiliary block 513 to form one or more grooves, thereby suppressing the unevenness and deformation caused by the cooling and solidification process.

[0053] The radial dimension of the shaft 511 is smaller than the radial dimension of the anti-slip portion 512, and the anti-slip portion 512 occupies a range of 150° to 210° in the circumferential direction. The anti-slip portion 512 has a larger radial dimension than the shaft 511. When the insertion rod 51 is inserted into the insertion hole 521 of the elastic sleeve 52, the anti-slip portion 512 will form a physical barrier at the end of the insertion hole 521, making it more difficult for the insertion rod 51 to be dislodged. The anti-slip portion 512 can be arranged around 360° in the circumferential direction, but it is preferred to occupy a specific angular range in the circumferential direction, preferably an angular range of 150° to 210°, which is more convenient for guiding and inserting the insertion rod 51, and also has a good effect of preventing the insertion rod 51 from withdrawing in the reverse direction.

[0054] The second connecting buckle group 6 is as follows Fig.11 and Fig.12 As shown, it includes an elastic snap ring 61 arranged on the installation object, a rigid bushing 62 accommodated in the elastic snap ring 61, and a locking member 63 inserted into the rigid bushing 62. Among them, the locking member 63 is preferably a screw, a bolt, etc., which passes through the rigid bushing 62 and fixes the rigid bushing 62 on the installation carrier. The elastic snap ring 61 is made of elastic materials such as silicone and rubber, which provides an effective buffer for the shell 1; the rigid bushing 62 is made of hard materials such as stainless steel, carbon steel, and aluminum alloy, which provides a carrier foundation for the fixation of the shell 1 to withstand a strong locking force. The elastic snap ring 61, the rigid bushing 62 and the locking member 63 cooperate to achieve a connection method that is both stable and has a buffering function, ensuring the reliable installation of the air filter under complex working conditions.

[0055] The elastic snap ring 61 is provided with a central accommodating hole 611 which passes through from top to bottom and is used to accommodate the rigid bushing 62 ; an annular groove 612 is formed on the circumference of the elastic snap ring 61 and is used to be engaged in a transverse notch on the installation object.

[0056] A set of pressure-bearing buffer blocks 613 are disposed on the upper and lower surfaces of the elastic clamping ring 61 around the central accommodating hole 611 , and the distance between the upper surface and the lower surface of the pressure-bearing buffer block 613 is greater than the height of the rigid bushing 62 .

[0057] When the vehicle encounters bumps or the engine vibrates during driving, the elastic snap ring 61, as an elastic element, can absorb and disperse these external forces, reducing the impact directly transmitted to the air filter housing 1. The setting of the pressure-bearing buffer block 613 further enhances this buffering ability, elastically deforms when subjected to pressure, strengthens the clamping of the transverse notch on the installation object from both sides, and reduces the risk of structural damage caused by local concentrated force.

[0058] As introduced above, the buffer connection assembly includes at least one first connection buckle group 5 and at least one second connection buckle group 6. Preferably, two first connection buckle groups 5 and one second connection buckle group 6 are provided on the shell 1, or three first connection buckle groups 5 and one second connection buckle group 6 are provided on the shell 1. Two or three first connection buckle groups 5 cooperate with one second connection buckle group 6, which can not only provide multi-point support to ensure the balance and stability of the installation of the shell 1, but also take into account the convenience and flexibility of installation. The first connection buckle group 5 is a pluggable structure, which is convenient for quick installation and disassembly, and is suitable for convenient operation during daily maintenance or replacement. The second connection buckle group 6 is fixed by a locking member 63, which provides stronger firmness and reliability, and can withstand strong vertical forces in both horizontal and vertical directions. The cooperation between the two can reduce installation time and improve efficiency while ensuring overall stability.

[0059] The above implementation modes are exemplary, and their purpose is to illustrate the technical concept and features of the utility model so that people familiar with the technology in this field can understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An air filter, characterized in that: The invention comprises a housing (1), and also comprises an air intake pipe (2) and an air exhaust pipe (3) connected to the housing (1); a filter element (4) is provided in the housing (1) to divide the internal space of the housing (1) into an air intake chamber and an air exhaust chamber; the air intake pipe (2) is communicated with the air intake chamber to introduce air to be filtered into the air intake chamber; the air exhaust pipe (3) is communicated with the air exhaust chamber to discharge air that has entered the air exhaust chamber after being filtered by the filter element (4); the housing (1) comprises a first filter housing (11) and a second filter housing (12) which are arranged in a butt joint manner, wherein the first filter housing (11) and the second filter housing (12) are connected to each other; The filter housing (11) has a first butt joint edge (111) at its opening, and the second filter housing (12) has a second butt joint edge (121) at its opening; the filter element (4) comprises a filter core (41) having a certain thickness and a sealing frame (42) arranged along the edge of the filter core (41), the sealing frame (42) having elasticity; when the first filter housing (11) and the second filter housing (12) are in a butt joint state, the sealing frame (42) is pressed and fixed between the first butt joint edge (111) and the second butt joint edge (121).

2. The air filter according to claim 1, characterized in that: The sealing frame (42) is formed in situ and combined with the edge of the filter element (41).

3. The air filter according to claim 1, characterized in that: The sealing frame (42) is a prefabricated part and is bonded to the edge of the filter element (41) using an adhesive.

4. The air filter according to claim 1, characterized in that: A reinforcement network (43) is also formed on one side of the filter element (41) and in the area surrounded by the sealing frame (42); the reinforcement network (43) is integrally connected to the sealing frame (42) at the edge.

5. The air filter according to claim 4, characterized in that: The reinforcement network (43) is composed of a plurality of hexagonal network units continuously spread on the surface of the filter element (41), and through pores are formed in each network unit.

6. The air filter according to claim 1, characterized in that: A sunken support step (1111) is formed on the inner side of the first butt joint edge (111) and along the extension direction of the first butt joint edge (111), and a bearing surface (421) is formed on the outer periphery of the sealing frame (42), the bearing surface (421) being adapted to the end surface of the support step (1111).

7. The air filter according to claim 6, characterized in that: An annular sealing groove (1211) is formed on the second docking edge (121) and on the side facing the first docking edge (111), and an annular sealing flange (422) is integrally formed on the sealing frame (42) and on the side facing the second docking edge (121); when the first docking edge (111) and the second docking edge (121) are docked, the sealing flange (422) is elastically deformed adaptively under the pressure of the sealing groove (1211) and fills the sealing groove (1211).

8. The air filter according to claim 7, characterized in that: A group of threaded holes (1112) are formed on the end surface of the first butt joint edge (111), a group of through holes (1212) penetrating the sealing groove (1211) are provided on the second butt joint edge (121), and a group of fasteners (13) pass through the through holes (1212) and are fastened in the threaded holes (1112) to fasten the first butt joint edge (111) and the second butt joint edge (121) together.

9. The air filter according to claim 8, characterized in that: The first butt joint edge (111) is located above the second butt joint edge (121), and the fastener (13) is located outside the sealing flange (422).

10. The air filter according to claim 1, characterized in that: The filter element (41) is a paper filter element or a non-woven fabric filter element.

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