Air filter assembly

Abstract

The utility model relates to an air filter assembly which comprises a flat shell, an air filter assembly and an air filter assembly. The filtering surface is arranged in the inner cavity of the shell, a gap is formed between the filtering surface and the shell, the filtering surface defines a flat barrel shape matched with the shell, at least one end of the filtering surface is provided with an opening in the axial direction of the filtering surface, and the end portion of the opening of the filtering surface is connected with the shell in a sealed mode so that the inner cavity of the shell can be divided into a first area and a second area. According to the air filter assembly provided by the embodiment of the invention, the filtering surface is arranged in the shell, the shell is flat, and the filtering surface is in the shape of a flat cylinder, so that the flat shape is more convenient during spatial layout, and the compact layout design between the air filter assembly and other equipment is facilitated; and the extension in the flat direction is more beneficial to increasing the air flow filtering area of the filtering surface, and the increase of the filtering area can reduce the air flow resistance of the filtering surface, so that the circulation of the air flow in the whole air treatment system is smoother.

Description

Technical Field

[0001] This application relates to the technical field of air filters, and particularly to an air filter assembly. Background Art

[0002] An air filter is a component that plays a filtering role in an air treatment system. Currently, the widely used air filter is a cylindrical air filter, and its structure is as Figure 1 shown, including a cylindrical outer shell 1-1 and a filter element 1-2. The filter element 1-2 is made of materials such as filter paper that can filter air. The outer shell 1-1 is sleeved outside the filter element 1-2, and ventilation holes are provided around the outer shell 1-1 for air flow to pass through. During operation, the air flow circulates as Figure 1 shown by the arrows in the figure. The air flow passes through the side wall of the outer shell 1-1 and the side wall of the filter element 1-2 from the outside and enters the inside of the filter element 1-2, and then flows out from one end of the filter element 1-2, thereby achieving the filtration of air. There are certain drawbacks in the application of this type of air filter. The resistance level of the filter element to air is relatively high, which affects the smoothness of air flow in the entire air treatment system. Moreover, the cylindrical structure also has certain limitations in the layout of equipment space, and it is not convenient to achieve a compact layout with other components. Summary of the Utility Model

[0003] The purpose of this application is to provide an air filter assembly, which can reduce the resistance to air and is conducive to the layout of equipment space, thereby effectively solving the deficiencies existing in the prior art.

[0004] To this end, an embodiment of this application provides an air filter assembly, including:

[0005] An outer shell, which is flat and has an internal cavity;

[0006] A filtering surface, which is arranged in the internal cavity of the outer shell, and there is a gap between the filtering surface and the outer shell. The filtering surface encloses a flat cylindrical shape adapted to the outer shell. The filtering surface is provided with at least one open end along its axial direction, and the end of the opening of the filtering surface is sealed to the outer shell to divide the internal cavity of the outer shell into a first region and a second region;

[0007] Wherein, an air inlet and an air outlet are provided on the outer shell, the air inlet is communicated with the first region, and the air outlet is communicated with the second region.

[0008] In a possible implementation manner, the cross-sectional area of one end of the filtering surface along its axial direction is larger than that of the other end.

[0009] In a possible implementation, the filtering surface is provided with an opening at the end with a larger axial cross-sectional area and is sealed at the other end. The opening end of the filtering surface is hermetically connected to the end of the housing where the air outlet is provided, and the sealed end of the filtering surface extends to the end of the housing where the air inlet is provided.

[0010] In a possible implementation, along the axis of the filtering surface, the air inlet and the air outlet are respectively provided at both ends of the housing.

[0011] In a possible implementation, the air inlet includes a first window and a second window, and the first window and the second window are respectively located on two outer peripheral sides of the housing along the flat direction of the housing at the corresponding end of the housing.

[0012] In a possible implementation, a recessed relief groove is partially provided on the flat side of the housing.

[0013] In a possible implementation, a connecting section is provided at the air outlet of the housing. One end of the connecting section is connected to the air outlet of the housing, and a third window is provided at the other end of the connecting section. The third window is communicated with the air outlet of the housing through the connecting section.

[0014] In a possible implementation, the housing includes a first section and a second section. The first section and the second section are detachably connected. The air inlet is provided at one end of the first section. The other end of the first section is connected to one end of the second section, and the air outlet is provided at the other end of the second section.

[0015] In a possible implementation, one end of the filtering surface along the axis is provided with an opening and the other end is sealed. The opening end of the filtering surface is hermetically connected to the air outlet on the second section, and the sealed end of the filtering surface extends to the air inlet on the first section.

[0016] In a possible implementation, a support frame is provided inside the connection between the first section and the second section. The support frame is hollow for the filtering surface to pass through, and the support frame is used to limit the deformation of the first section and the second section.

[0017] In a possible implementation, the support frame is connected to the inside of the second section, and the support frame and the second section cooperate to form a limiting groove, which is used to assist in aligning the first section and the second section when they are connected.

[0018] In a possible implementation, the filtering surface includes a frame and a filtering layer. The filtering layer surrounds the outside of the frame. The frame is provided with gaps for air flow to pass through, and the filtering layer is used to filter the air flow.

[0019] In a possible implementation, one end of the filtering surface is open along the axial direction, and the other end is sealed. The open end of the filtering surface is hermetically connected to the end of the housing where the air outlet is provided through a sealing rubber ring, and the sealed end of the filtering surface is connected to the inner side of the end of the housing where the air inlet is provided through a sealing gasket.

[0020] According to the air filter assembly provided by the embodiment of the present application, the filtering surface is arranged inside the housing, and the housing is in a flat shape, and the filtering surface is in the shape of a flat cylinder. In this way, the flat shape is more convenient for spatial layout, facilitating a compact layout design with other devices, and the extension in the flat direction is more conducive to increasing the filtering area of the filtering surface for the air flow. The increase in the filtering area can reduce the resistance of the filtering surface to the air flow, making the air flow in the entire air treatment system more smooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of an air filter in the prior art;

[0022] Figure 2 is a schematic structural diagram of the air filter assembly provided by the embodiment of the present application;

[0023] Figure 3 is a schematic structural diagram of the air filter assembly provided by the embodiment of the present application from another perspective;

[0024] Figure 4 is an exploded view of the air filter assembly provided by the embodiment of the present application;

[0025] Figure 5 is a schematic structural diagram of the first section provided by the embodiment of the present application;

[0026] Figure 6 is a schematic structural diagram of the second section provided by the embodiment of the present application;

[0027] Figure 7 is a schematic structural diagram of the second section provided by the embodiment of the present application from another perspective;

[0028] Figure 8 is a schematic structural diagram of the support frame provided by the embodiment of the present application;

[0029] Figure 9 is a schematic structural diagram of the combined and partially cut-away filtering surface, sealing rubber ring, and sealing gasket provided by the embodiment of the present application;

[0030] Figure 10 is an exploded view of the filtering surface provided by the embodiment of the present application;

[0031] Figure 11 is a schematic cross-sectional structural diagram of the filtering surface when the filter layer is a continuous folded filter paper provided by the embodiment of the present application;

[0032] Figure 12 This is a schematic structural diagram of the air filter assembly after partial sectioning provided by the embodiment of the present application;

[0033] Figure 13 is Figure 12 a partial enlarged view of location A in

[0034] Figure 14 is Figure 12 a partial enlarged view of location B in. Specific embodiments

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0036] As Figures 1 - 14 shown, the embodiment of the present application provides an air filter sensor assembly, which is applied to an air treatment system, and more preferably applied to the air treatment system of a vehicle, to filter and remove impurities from the air flow in the air treatment system. Currently, in vehicles, the more widely used air filter is a cylindrical air filter, which includes a cylindrical housing and a cylindrical filter element. The filter element is usually composed of filter paper. The filter element and the housing are coaxially arranged. The external air flow passes through the outer peripheral wall of the housing and then through the filter element, and then the air flow flows out from one end inside the filter element, thereby completing the filtration of the air flow. The cylindrical air filter has certain drawbacks. The air flow will generate resistance when passing through the filter element. After the air treatment system is pre-set, the air flow rate in the air treatment system is a fixed value. Therefore, the resistance of the filter element to the air flow is affected by the filtration area of the filter element for the air flow. The larger the filtration area of the filter element, the smaller the resistance. The current cylindrical air filter has a relatively high resistance level to the air flow, which affects the smoothness of the air flow in the air treatment system. If the resistance level to the air flow is to be reduced, it is necessary to increase the volume of the filter element to achieve an increase in the filtration area of the air flow. However, in vehicle applications, the cylindrical structure is not convenient for achieving a compact layout with other vehicle components, and there are many limitations in the spatial layout in the vehicle. If the volume of the filter element is blindly increased, the negative impact on the spatial layout will be greater. The present application aims to reduce the air flow resistance and improve the convenience of the layout of the air filter in the vehicle.

[0037] The air filter assembly includes a housing 100 and a filter surface 200. The housing 100 is arranged in a flat shape and has an internal cavity. The filter surface 200 is disposed in the internal cavity of the housing 100, that is, the housing 100 surrounds the periphery of the filter surface 200. A gap is provided between the filter surface 200 and the housing 100, and this gap can allow air flow. The filter surface 200 encloses a flat cylindrical structure. The flat direction of the filter surface 200 and the flat direction of the housing 100 are adapted to each other. For the flat cylindrical structure enclosed by the filter surface 200, at least one end of the two ends along its axis is provided with an opening, and the end of the opening of the filter surface 200 is sealingly connected to the inner side wall of the housing 100, thereby dividing the internal cavity of the housing 100 into a first region and a second region. The flat cylindrical filter surface 200 divides the internal cavity of the housing 100 into two parts of space, which are the first region and the second region respectively. In addition, an air inlet 101 and an air outlet 102 are provided on the housing 100. The air inlet 101 is communicated with the first region, and the air outlet 102 is communicated with the second region. When the housing 100 is connected to the air treatment system pipeline through the air inlet 101 and the air outlet 102, the air flow first flows into the first region, and then the air flow passes through the filter surface 200 and flows into the second region, thereby realizing the filtration of the air flow.

[0038] Both the filter surface 200 and the housing are in a flat shape. Compared with the cylindrical structure, the flat structure is easier to be arranged on the vehicle, and it is easier to make a compact layout with other components on the vehicle. Moreover, for the flat structure, when the volume is increased to increase the filtration area of the filter surface 200, compared with the cylindrical structure, the level of space occupation increase of the flat structure is easier to control. The positive effect of the filtration area increase brought by the increase in the volume of the flat structure is significantly better than the increase in space occupation. Therefore, when designing to reduce the resistance of the air treatment system, the design space of the flat air filter is larger. Therefore, the flat air filter assembly of the embodiment of the present application can achieve a lower air flow resistance level and an improvement in the convenience of space layout.

[0039] In some examples, for the flat tube structure enclosed by the filter surface 200, along the axial direction of the filter surface 200, one end of the filter surface 200 is open, and the other end of the filter surface 200 is sealed. Taking the normal state of the outer shell 100 as an example for illustration, in this state, the axial direction of the filter surface 200 is the vertical direction, the top end of the filter surface 200 is open, the bottom end of the filter surface 200 is sealed, the air inlet 101 is arranged at the bottom end of the outer shell 100, the air outlet 102 is arranged at the top end of the outer shell 100, and the top opening of the filter surface 200 is connected to the top opening of the outer shell 100 to form a seal. The external air flow enters the first region from the air inlet 101, then the air flow passes through the filter surface 200 from the outside of the filter surface 200 into the inside of the filter surface 200, and then the air flow flows outwards from the top opening of the filter surface 200, thereby realizing the filtration of the air flow. In this embodiment, after the air flow enters the first region from the bottom end, a part of the air flow circulates upwards along the gap between the filter surface 200 and the outer shell 100, and a part of the air flow passes through the filter surface 200. The air flow disperses and circulates upwards while passing through the filter surface 200, and the whole process is smoother and gentler, which is beneficial to reducing the resistance of the filter surface 200 to the overall air flow.

[0040] Preferably, the cross-sectional area of one end of the filter surface 200 along the axial direction is larger than that of the other end. In one example, taking the normal state of the outer shell 100 as an example for illustration, the axial direction of the filter surface 200 is the vertical direction, and the cross-sectional area of the top opening of the filter surface 200 is larger than that of the bottom opening of the filter surface 200, so that the top end of the filter surface 200 is a large opening and the bottom end is a small opening, making the contact surface between the filter surface 200 and the air flow inclined in the vertical direction. This contact surface is inclined in the outer shell 100, and the vertical path length of this contact surface is increased along the vertical direction. During the upward movement of the air flow, on the one hand, the outside of the filter surface 200 can strike the air flow at a certain angle, which is beneficial to the air flow passing through the filter surface 200, and at the same time, it also increases the filtration area and is beneficial to reducing the resistance.

[0041] More preferably, the filtering surface 200 is arranged to be open at the end with a larger axial cross-sectional area, and the filtering surface 200 is arranged to be sealed at the end with a smaller axial cross-sectional area. The open end of the filtering surface 200 is hermetically connected to the end of the housing 100 where the air outlet 102 is provided, and the sealed end of the filtering surface 200 extends to the end of the housing 100 where the air inlet 101 is provided. That is, when the axis of the filtering surface 200 is in the vertical direction, the top end of the filtering surface 200 is open and hermetically connected to the top air outlet 102 of the housing 100, the bottom end of the filtering surface 200 is sealed and extends to the bottom air inlet 101 of the housing 100. The external air flow enters the first region from the air inlet 101 at the bottom end of the housing 100, then the air flow passes through the filtering surface 200 of the housing 100 and enters the interior of the filtering surface 200, and then the air flow flows out from the top opening of the filtering surface 200, completing the filtration of the air flow.

[0042] More preferably, the air inlet 101 includes a first window 1011 and a second window 1012. The first window 1011 and the second window 1012 are respectively located on the two outer peripheral sides of the housing 100 along the flat direction of the housing 100 at the corresponding end of the housing 100. Taking the housing 100 placed upright as an example for illustration, the axis of the filtering surface 200 is in the vertical direction, and the flat direction of the filtering surface 200 is the same as that of the housing 100. Taking the flat surface, both the filtering surface 200 and the housing 100 form a flat structure within the flat surface. In the direction perpendicular to the flat surface, the size of the flat structure formed by the filtering surface 200 and the housing 100 is the thickness dimension. Taking the state facing the flat surface, the projections of the housing 100 and the filtering surface 200 within the flat surface are both rectangles. The vertical dimension of this rectangle is the length, and the horizontal dimension is the width. The first window 1011 and the second window 1012 are arranged on the left and right sides of the bottom end of the housing 100. When the air flow enters the first region, it enters the first region along a direction parallel to the flat surface. The highest impact intensity of the air flow on the filtering surface 200 occurs in the regions near the first window 1011 and the second window 1012. By arranging the positions of the first window 1011 and the second window 1012 on the left and right sides of the bottom end of the housing 100, the direction of the impact force of the air flow on the filtering surface 200 is also parallel to the flat surface. The filtering surface 200 is more impacted in the direction parallel to the flat surface, and the impact intensity of the flat cylindrical filtering surface 200 in this direction is the highest, which is conducive to improving the overall structural strength, preventing local structural deformation, and is conducive to improving the working stability and the service life of the equipment.

[0043] In this embodiment, a recessed relief groove is locally provided on the flat side of the housing 100. That is, when facing the flat surface, a recessed relief groove is provided on the front or rear side of the bottom end of the housing 100. The size of the relief groove can be set according to the actual layout requirements of the vehicle to prevent interference with other components on the vehicle. Moreover, the recess causes the structure to bend, which is beneficial to improving the local structural strength.

[0044] Preferably, a connection section 300 is provided at the air outlet 102 of the housing 100. One end of the connection section 300 is connected to the air outlet 102 of the housing 100, and a third window 301 is provided at the other end of the connection section 300. The third window 301 is in communication with the air outlet 102 of the housing 100 through the connection section 300. In this embodiment, the connection section 300 can be connected to the gas pipeline through the third window 301. The shape and orientation of the connection section 300 and the orientation of the third window 301 can be specifically set according to the vehicle space layout to improve the convenience of the space layout.

[0045] More preferably, the outer casing 100 includes a first section 11 and a second section 12. The first section 11 and the second section 12 are detachably connected. The air inlet 101 is disposed at one end of the first section 11. The other end of the first section 11 is connected to one end of the second section 12. The air outlet 102 is disposed at the other end of the second section 12. When the outer casing 100 is placed upright, the upper half of the outer casing 100 is the second section 12, and the lower half of the outer casing 100 is the first section 11. Both the first section 11 and the second section 12 are flat. The top of the first section 11 is open, and the bottom of the first section 11 is sealed. The first window 1011 and the second window 1012 are respectively disposed on the left and right sides of the bottom of the first section 11. The top and bottom of the second section 12 are both open. The top opening of the second section 12 constitutes the air outlet 102. The first section 11 and the second section 12 can be detachably connected by screws, which is convenient for internal maintenance and replacement of the filter surface 200. In this embodiment, a first fence 111 is disposed on the outer periphery of the top of the first section 11. The first fence 111 is arranged along the outer periphery of the top of the first section 11. A gap groove opening upward is formed between the first fence 111 and the top of the first section 11. A second fence 121 is disposed on the outer periphery of the bottom of the second section 12. The second fence 121 is arranged along the outer periphery of the bottom of the second section 12. A gap groove opening downward is formed between the second fence 121 and the bottom of the second section 12. When assembling and connecting the first section 11 and the second section 12, the first fence 111 is adapted to the gap groove formed at the bottom of the second section 12. At the same time, the bottom of the second section 12 is adapted to the gap groove formed at the top of the first section 11. Thus, the alignment and connection are more convenient. Connection ears can be respectively disposed on the first section 11 and the second section 12, and the connection ears are connected by screws to realize the connection between the first section 11 and the second section 12.

[0046] In this embodiment, ribs that are criss-crossed and protrude outward can be disposed on the outer sidewalls of both the first section 11 and the second section 12 to enhance the overall structural strength.

[0047] In this embodiment, the top opening of the filter surface 200 is hermetically connected to the air outlet 102 at the top of the second section 12, and the bottom end of the filter surface 200 is sealed and extends to the air inlet 101 at the bottom of the first section 11.

[0048] More preferably, a support frame 400 is arranged inside the connection part of the first section 11 and the second section 12. The support frame 400 is hollow to allow the filter surface 200 to pass through up and down. The support frame 400 is used to limit the deformation of the first section 11 and the second section 12, and improve the overall structural stability. In this embodiment, the outer side of the support frame 400 is connected near the connection part of the first section 11 and the second section 12. The support frame 400 is sleeved outside the filter surface 200, and the support frame 400 and the filter surface 200 do not contact each other to prevent affecting the internal air flow. Preferably, the outer side of the support frame 400 is connected to the inner side of the second section 12. The support frame 400 and the second section 12 cooperate to form a limiting groove, and the limiting groove is used to assist the alignment when the first section 11 and the second section 12 are connected. In this example, the outer side of the support frame 400 is connected to the inner side wall of the second section 12. A plurality of limiting clamping columns 401 are arranged along the inner side of the support frame 400. There is a gap between the limiting clamping columns 401 and the inner side wall of the second section 12 to form a limiting groove. When installing the first section 11 and the second section 12, the top periphery of the first section 11 is adapted to the limiting groove, further improving the convenience of positioning and connection. A plurality of ventilation holes can be arranged vertically through the support frame 400 to allow air flow to pass through.

[0049] In some embodiments, the filter surface 200 includes a frame 201 and a filter layer 202. The filter layer 202 is arranged around the outside of the frame 201. The frame 201 is provided with gaps for air flow to pass through. The filter layer 202 is used to filter air flow. The filter layer 202 can be sponge. Preferably, the filter layer 202 is a continuously folded filter paper. As Figure 11 shown, in the cross section, the filter layer 202 is continuously folded and integrally enclosed into a flat cylindrical shape. The frame 201 is a cross-shaped net frame structure. One side of the frame 201 is arranged with a plurality of rods crossing each other, and the frame 201 is integrally enclosed into a flat cylindrical shape. The material of the frame 201 is plastic or metal. The frame 201 is used to support the filter layer 202 to prevent the filter layer 202 from deforming under the impact of air flow.

[0050] Preferably, one end of the filter surface 200 is open and the other end is sealed along the axial direction. When the axial direction of the filter surface 200 is the vertical direction, the top end of the filter surface 200 is open, and the bottom end of the filter surface 200 is sealed. The top periphery of the filter surface 200 is hermetically connected to the periphery of the air outlet 102 at the top end of the housing 100 through an annular sealing rubber ring 500. A flat sealing rubber pad 600 is arranged at the sealed bottom end of the filter surface 200. The bottom end of the filter surface 200 is connected to the inner side of the bottom end of the housing 100 provided with the air inlet 101 through the sealing rubber pad 600. The sealing rubber ring 500 and the sealing rubber pad 600 can both be PU glue to improve the overall connection strength.

[0051] It should be noted that phrases such as "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when describing a specific feature, structure or characteristic in combination with an embodiment, it is within the knowledge scope of those skilled in the art to implement such a feature, structure or characteristic in combination with other embodiments, whether explicitly or implicitly described.

[0052] It should be easily understood that the terms "on", "above" and "over" in the present disclosure should be interpreted in the broadest manner, so that "on" not only means "directly on something", but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over something", but may also include the meaning of "above" or "over something" without intermediate features or layers therebetween (i.e., directly on something).

[0053] In addition, for the convenience of description, spatial relative terms may be used in the text, such as "below", "beneath", "under", "above", "over", etc., to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatial relative terms are intended to include different orientations of the device in use or operation other than the orientation shown in the drawings. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used in the text may be interpreted accordingly.

[0054] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An air filter assembly, characterized in that, Comprising: A housing, which is flat, and the housing has an internal cavity; A filter surface, which is arranged in the internal cavity of the housing, and there is a gap between the filter surface and the housing. The filter surface encloses a flat cylindrical shape adapted to the housing. The filter surface is provided with an opening at least at one end along its axial direction, and the end of the opening of the filter surface is hermetically connected to the housing to divide the internal cavity of the housing into a first region and a second region; Wherein, an air inlet and an air outlet are provided on the housing. The air inlet communicates with the first region, and the air outlet communicates with the second region.

2. The air filter assembly according to claim 1, wherein: The cross-sectional area of one end of the filter surface along its axial direction is larger than that of the other end.

3. The air filter assembly according to claim 2, wherein: The end of the filter surface with a larger cross-sectional area along its axial direction is provided with an opening, and the other end is sealed. The opening end of the filter surface is hermetically connected to the end of the housing where the air outlet is provided, and the sealed end of the filter surface extends to the end of the housing where the air inlet is provided.

4. The air filter assembly according to claim 3, wherein: Along the axial direction of the filter surface, the air inlet and the air outlet are respectively arranged at both ends of the housing.

5. The air filter assembly according to claim 4, wherein: The air inlet includes a first window and a second window, and the first window and the second window are respectively located on two outer peripheral sides of the housing along the flat direction of the housing at the corresponding end of the housing.

6. The air filter assembly according to claim 1, characterized in that: A concave relief groove is locally provided on one flat side of the housing.

7. A kind of air filter assembly according to claim 1, characterized in that: A connecting section is provided at the air outlet of the housing. One end of the connecting section is connected to the air outlet of the housing, and a third window is provided at the other end of the connecting section. The third window communicates with the air outlet of the housing through the connecting section.

8. The air filter assembly according to claim 1, wherein: The housing includes a first section and a second section, and the first section and the second section are detachably connected. The air inlet is provided at one end of the first section, the other end of the first section is connected to one end of the second section, and the air outlet is provided at the other end of the second section.

9. The air filter assembly according to claim 8, wherein: One end of the filter surface along the axial direction is provided with an opening, and the other end is sealed. The opening end of the filter surface is hermetically connected to the air outlet on the second section, and the sealed end of the filter surface extends to the air inlet on the first section.

10. The air filter assembly according to claim 8, wherein: A support frame is provided inside the connection between the first section and the second section. The support frame is hollow for the filter surface to pass through, and the support frame is used to limit the deformation of the first section and the second section.

11. A kind of air filter assembly according to claim 10, characterized in that: The support frame is connected to the inside of the second section, and the support frame and the second section cooperate to form a limiting groove, and the limiting groove is used to assist the alignment when the first section and the second section are connected.

12. The air filter assembly according to claim 1, wherein: The filter surface includes a frame and a filter layer. The filter layer is disposed outside the frame. The frame is provided with gaps for air flow to pass through, and the filter layer is used to filter the air flow.

13. The air filter assembly according to claim 1, characterized in that: One end of the filter surface along the axial direction is provided with an opening, and the other end is sealed. The opening end of the filter surface is hermetically connected to the end of the housing where the air outlet is provided through a sealing rubber ring, and the sealed end of the filter surface is connected to the inside of the end of the housing where the air inlet is provided through a sealing gasket.

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