An air filter element

Abstract

The present invention provides an air filter element, which includes an outer frame, a first seal, a filter medium and a second seal. The outer frame is in the shape of a shell with a handle at the air inlet end, the filter medium is arranged in the outer frame, and the second seal is bonded and sealed on the outer frame and the air outlet end of the filter medium. The bottom surface of the second seal is bonded to the bottom edge of the filter medium and the bottom surface of the outer frame, and the side surface is bonded to the gap between the outer frame and the filter medium and the outer wall of the outer frame. The outer wall of the second seal assembly is interference fit with the inner wall of the filter housing to form a radial seal; the first seal is arranged on the outer wall of the air inlet end of the outer frame, and the top surface and the bottom surface are respectively the first sealing surface and the second sealing surface; the outer frame is pressed against the sealing surface B of the filter housing through the first sealing surface and the sealing surface A of the filter front cover, the first sealing surface and the sealing surface A constitute a first axial seal, and the second sealing surface and the sealing surface B constitute a second axial seal.

Description

Technical Field

[0001] The invention belongs to the technical field of air filtration and relates to an air filter accessory, in particular to an air filter element. Background Art

[0002] Donaldson's related patents disclose a type of direct-flow air filter element structure using a clamping seal (or axial seal), such as:

[0003] Patent CN109715265B discloses a filter element structure using a clamping seal (axial seal), which consists of a media pack, a housing, a frame member and a sealing member (see its specification). Figure 13 );

[0004] Patent CN111417448B discloses a filter element structure using a clamping seal (axial seal), which consists of a media pack, a housing, a frame member, and a sealing member. The sealing member has a protruding / recessed profile (see Figure 24 in the specification).

[0005] Similarly, Donaldson patent CN105555389B (divisions CN107715607B, CN107715608B, CN111603867B, CN114887415B) also discloses a filter element structure consisting of a media pack, a shell, a frame component and a sealing component, wherein the sealing component has an undulating and concave-convex structure (see Figure 62 in the specification of CN105555389B).

[0006] In a filter element with this type of structure, the sealing component is a flexible sealing component, which is generally formed as a whole by foaming polyurethane material. During the molding process, the polyurethane material simultaneously bonds the frame component, the outer shell and the medium pack together to form a complete filter element structure (see Figure 57C / 57D in the specification of CN105555389B).

[0007] According to the description of the above-mentioned prior art, the manufacturing process of this type of filter element structure is as follows: the media pack is first placed within the housing and positioned against the bottom of the housing. Then, a frame member is placed at the head of the media pack, and the frame member is positioned against the head of the media pack. A gap is left between the frame member and the housing sealing member. The sealing member is integrally foamed and molded using polyurethane material. During the molding process, the polyurethane material fills the gap between the three and bonds the frame member, housing, and media pack together to form the final sealing member structure (Figures 57C / 57D in the CN105555389B patent specification). This technical solution requires a high degree of structural coordination between the frame member and the housing, as well as positioning coordination with the media pack, making the design of the frame member and housing structure relatively complex. At the same time, the sealing member molding process must simultaneously ensure that the frame member, housing, and media pack are firmly bonded together, which places high demands on the process. This is not conducive to reducing costs in terms of both the structure of the parts and the process implementation.

[0008] At the same time, the filter element of this structure adopts a clamping sealing structure. Only the air inlet end of the filter element has a sealing component that cooperates with the air filter housing and is compressed and sealed by the air filter front cover. Since the air filter works in a vibrating environment for a long time, the long-term vibration reduces the clamping capacity of the air filter front cover. At the same time, the filter element shakes in the air filter housing. Both of these make its axial sealing joint surface have the risk of loosening and sealing failure, which in turn causes the air filter bypass to lose its filtering function. Summary of the Invention

[0009] The purpose of the present invention is to provide an air filter element to solve the technical problems existing in the prior art of complex filter element manufacturing process, high cost, and poor sealing reliability and stability between the filter element and the air filter housing.

[0010] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0011] An air filter element, comprising an outer frame, a first sealing member, a filter medium, and a second sealing member. The outer frame is in the shape of a shell with a handle at the air inlet end. The filter medium is disposed within the outer frame. The second sealing member is adhesively sealed to the outer frame and the air outlet end of the filter medium. The bottom surface of the second sealing member is adhesively bonded to the bottom edge of the filter medium and the bottom surface of the outer frame. The side surface is adhesively bonded to the gap between the outer frame and the filter medium and to the outer side wall of the outer frame. The outer side wall of the second sealing member is interference-fitted with the inner wall of the filter housing to form a radial seal.

[0012] The first sealing member is arranged on the outer wall of the air inlet end of the outer frame, and the top surface and the bottom surface are respectively the first sealing surface and the second sealing surface. The outer frame is pressed against the sealing surface B of the filter housing through the first sealing surface and the sealing surface A of the filter front cover. The first sealing surface and the sealing surface A constitute a first axial seal, and the second sealing surface and the sealing surface B constitute a second axial seal.

[0013] The outer frame further comprises a step flow groove and a positioning step, wherein the positioning step is arranged on the inner side surface of the air inlet end of the outer frame, and the filter medium is arranged in the outer frame through the positioning step;

[0014] The step flow groove is annularly arranged on the side of the air inlet end of the outer frame and extends out of the side of the outer frame. The first seal is wrapped around the top, bottom and side surfaces of the step flow groove. The outer frame is arranged on the sealing surface B of the filter housing through the step flow groove and the first seal.

[0015] The outer frame also includes one or more accommodating portions, which are hollow protrusions on the stepped circulation groove. The bottom surface of the accommodating portion is connected to the interior of the protrusion. The first sealing member is wrapped around the bottom surface and side surfaces of the lower end of the accommodating portion. The inner wall of the filter housing is provided with a protrusion that can extend from the bottom of the accommodating portion and cooperate with the accommodating portion. The outer frame is positioned on the sealing surface B of the filter housing through the accommodating portion and the protrusion.

[0016] The outer side of the step flow groove is uniformly toothed.

[0017] The bottom of the inner side surface of the air outlet end of the outer frame is an inclined annular surface, and a colloid containing space is formed between the annular surface and the outer surface of the filter medium. The second sealing member bonds the filter medium and the open end of the outer frame together through the colloid containing space.

[0018] The outermost circumferential surface of the second seal is a radial sealing surface. A guiding slope is provided at the bottom end of the radial sealing surface. The inner wall of the filter housing is interference-fitted with the radial sealing surface after passing the guiding slope to form a radial sealing belt.

[0019] The filter medium is a direct-flow filter structure, including a first corrugated filter material and a second corrugated filter material. The corrugations of the first corrugated filter material and the second corrugated filter material are vertically cross-distributed, and each includes one or more rows of first wave crests and second wave crests.

[0020] The handle is arranged at the air inlet end of the outer frame through connecting ribs.

[0021] The first sealing surface and the second sealing surface of the first sealing member are respectively flat surfaces without undulations.

[0022] The beneficial effects of the present invention are as follows: the present invention provides an air filter element that uses only one outer frame plastic part, thereby saving mold manufacturing costs and reducing manufacturing costs; and a receiving portion and a handle are provided on the outer frame, so that the receiving portion and the protrusion on the filter housing can cooperate with each other to facilitate axial positioning, and the handle can also make it more convenient to install and remove the filter element;

[0023] The outer frame and the air outlet end of the filter medium are bonded and sealed by a second sealing member. Compared with the prior art which requires a seal, a housing, a filter medium and a frame member to form a complete filter element structure, the process of the present invention is simpler and the manufacturing cost is low. The second sealing member is foamed and molded in the filter medium and the outer frame by using a polyurethane foam molding material and a preset mold tooling. The outer frame and the filter medium can be bonded as a whole during the foam molding process of the second sealing member. Moreover, the second sealing member can not only meet the sealing requirements of its own structure, but also form a radial sealing band through the interference fit between the filter element and the filter housing.

[0024] The present invention uses a double sealing structure: the first sealing member forms an axial seal at the air inlet end of the filter element, and the second sealing member forms a radial seal at the air outlet end of the filter element. Two sealing bands are formed at the air inlet end and the air outlet end of the filter element. This can not only improve the reliability of the filter element seal, but also utilize the radial sealing band to limit the filter element, so that the filter element is not easily loosened in the filter housing due to long-term vibration of the air filter, and prevent the axial seal of the first sealing member from failing to seal due to loosening of the filter element, thereby improving the sealing stability.

[0025] At the same time, the filter medium used in the present invention can improve the dust holding capacity of the filter medium by adopting an improved direct-flow filter structure, thereby increasing the service life of the filter element.

[0026] The technical solution provided by the present invention can effectively simplify the production process of air filter elements and reduce manufacturing costs, while improving the reliability and stability of the filter element seal and extending the service life of the filter element, and is suitable for promotion and application in the field of air filters. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0028] Figure 2 for Figure 1 Exploded diagram;

[0029] Figure 3 for Figure 1 Schematic diagram of the half-section structure in the middle and long side direction;

[0030] Figure 4 for Figure 1 Schematic diagram of the half-section structure in the short side direction;

[0031] Figure 5 for Figure 4 A partial enlarged schematic diagram of point A in the middle;

[0032] Figure 6 for Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0033] Figure 7 This is a schematic diagram of the main structure of the outer frame of the present invention;

[0034] Figure 8 for Figure 7 A schematic diagram of a half-section structure in the long side direction;

[0035] Figure 9 for Figure 8 A partial enlarged schematic diagram of point C in the middle;

[0036] Figure 10 This is a schematic diagram of a half-section structure in the long side direction when the present invention is used in a filter;

[0037] Figure 11 for Figure 10 A partial enlarged schematic diagram of point D in the middle;

[0038] Figure 12 for Figure 10 A partial enlarged schematic diagram of point E in the middle;

[0039] Figure 13 Schematic diagram of the structure of the filter medium in the present invention;

[0040] Figure 14 Schematic diagram of the airflow direction during filtration by the filter medium in the present invention.

[0041] Description of symbols in the figure: 100, filter element, 200, filter front cover, 201, sealing surface A, 300, filter housing, 301, sealing surface B;

[0042] 1. Outer frame, 2. First sealing member, 3. Second sealing member, 4. Filter medium, 5. Handle, 6. First sealing surface, 7. Second sealing surface, 8. Step flow groove, 9. Positioning step, 10. Accommodation portion, 11. Protrusion, 12. Annular surface, 13. Colloid accommodation space, 14. Radial sealing surface, 15. Guide slope, 16. Radial sealing strip, 17. First corrugated filter material, 18. Second corrugated filter material, 19. First wave peak, 20. Second wave peak. DETAILED DESCRIPTION

[0043] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0044] like Figures 1 to 6 As shown, the present invention provides an air filter element, which includes an outer frame 1, a first sealing member 2, a filter medium 4, and a second sealing member 3. The outer frame 1 is in the shape of a shell with a handle 5 at the air inlet end, wherein the handle 5 is provided at the air inlet end of the outer frame 1 via a connecting rib. The filter medium 4 is provided within the outer frame 1 for filtering air. The second sealing member 3 is foamed and molded on the filter medium 4 and the air outlet end of the outer frame 1 using a polyurethane foam molding material and a preset mold tooling, and is bonded and sealed to the outer frame 1 and the air outlet end of the filter medium 4.

[0045] The bottom surface of the second sealing member 3 is bonded to the bottom edge of the filter medium 4 and the bottom surface of the outer frame 1, so that the two form an integral whole. The side surface of the second sealing member 3 is bonded to the gap between the outer frame 1 and the filter medium 4 and to the outer wall of the outer frame 1. After the second sealing member 3 is bonded to the filter medium 4 and the outer frame 1, the filter housing 300 is inserted from the bottom to the top of the outer frame 1. The outer wall of the second sealing member 3 and the inner wall of the filter housing 300 form an interference fit to form a radial seal.

[0046] The first sealing member 2 is provided on the outer wall of the air inlet end of the outer frame 1, and the top surface and the bottom surface are respectively the first sealing surface 6 and the second sealing surface 7. The outer frame 1 is pressed against the sealing surface B301 of the filter housing 300 through the first sealing surface 6 and the sealing surface A201 of the filter front cover 200. Figure 10 、 Figure 11 As shown, the first sealing surface 6 and the sealing surface A201 form a first axial seal, and the second sealing surface 7 and the sealing surface B301 form a second axial seal, thereby forming an axial sealing belt at the air inlet end of the filter.

[0047] The first seal 2 can be foamed between the outer frame 1 and the filter housing 300 by using a polyurethane foam molding material and a preset mold tooling, or it can be a detachable elastomeric sealing component independent of the outer frame 1, and firmly and independently mounted on the outer frame 1 by glue. In this embodiment, the first seal 2 is preferably foamed between the outer frame 1 and the filter housing 300 by using a polyurethane foam molding material and a preset mold tooling, and after the foaming is completed, the first sealing surface 6 and the second sealing surface 7 of the first seal 2 are respectively flat surfaces without undulations.

[0048] Specifically, such as Figures 7 to 9 As shown, in order to enable the outer frame 1 to be disposed between the filter housing 300 and the filter front cover 200 via the first sealing member 2, the outer frame 1 further includes a stepped flow groove 8 and a positioning step 9. The positioning step 9 is disposed on the inner side surface of the air inlet end of the outer frame 1 to limit the top surface of the filter medium 4. The filter medium 4 is disposed within the outer frame 1 via the positioning step 9.

[0049] The step circulation groove 8 is annularly arranged on the side of the air inlet end of the outer frame 1 and extends out of the side of the outer frame 1. The first seal 2 is wrapped on the top, bottom and side surfaces of the step circulation groove 8. In order to facilitate the polyurethane foam molding material to flow to the bottom of the step circulation groove 8 and make the first seal 2 foamed, in this embodiment, the outer side of the step circulation groove 8 is uniformly toothed, and the outer frame 1 is arranged on the sealing surface B301 of the filter housing 300 through the step circulation groove 8 and the first seal 2.

[0050] Furthermore, in order to facilitate axial positioning of the outer frame 1, the outer frame 1 further includes one or more receiving portions 10. In this embodiment, two receiving portions 10 are preferably provided, and the two receiving portions 10 are symmetrically arranged on the step flow groove 8. Specifically, Figure 9 、 Figure 11 As shown, the accommodating portion 10 is a hollow protrusion on the stepped flow groove 8, the bottom surface of the accommodating portion 10 is connected to the inside of the protrusion, the first sealing member 2 is wrapped around the bottom surface and side surface of the lower end of the accommodating portion 10, and the inner wall of the filter housing 300 is provided with a protrusion 11 that can extend from the bottom of the accommodating portion 10 and cooperate with the accommodating portion 10. The outer frame 1 is positioned on the sealing surface B301 of the filter housing 300 through the accommodating portion 10 and the protrusion 11.

[0051] Further, such as Figure 6 、 Figure 12 As shown, the bottom of the inner side surface of the air outlet end of the outer frame 1 is an inclined annular surface 12, and a colloid containing space 13 is formed between the annular surface 12 and the outer surface of the filter medium 4. The second sealing member 3 bonds the filter medium 4 and the open end of the outer frame 1 together through the colloid containing space 13.

[0052] Further, such as Figure 6 、 Figure 12 As shown, the outermost circumferential surface of the second seal 3 is a radial sealing surface 14, and a guide slope 15 is provided at the bottom end of the radial sealing surface 14. The inner wall of the filter housing 300 passes through the guide slope 15 and is interference-fitted with the radial sealing surface 14 to form a radial sealing belt 16.

[0053] Furthermore, in order to improve the dust holding capacity of the filter medium 4 and extend the service life of the filter element 100, the filter medium 4 in this embodiment is a direct flow filter structure, such as Figure 13 、 Figure 14As shown, the filter medium 4 specifically includes a first corrugated filter material 17 and a second corrugated filter material 18. The corrugations of the first corrugated filter material 17 and the second corrugated filter material 18 are vertically cross-distributed, and respectively include one or more rows of first wave peaks 19 and second wave peaks 20, wherein the first wave peak is slightly higher than the second wave peak. This filter medium can increase the effective area involved in filtration, thereby improving the dirt holding capacity of the filter medium to a certain extent. In some scenarios, the first corrugated filter material can also be a flat filter material.

Claims

1. An air filter element, characterized in that: It comprises an outer frame (1), a first sealing member (2), a filter medium (4) and a second sealing member (3); the outer frame (1) is in the shape of a shell with a handle (5) at the air inlet end; the filter medium (4) is arranged in the outer frame (1); the second sealing member (3) is bonded and sealed to the outer frame (1) and the air outlet end of the filter medium (4); the bottom surface of the second sealing member (3) is bonded to the bottom edge of the filter medium (4) and the bottom surface of the outer frame (1); the side surface is bonded to the gap between the outer frame (1) and the filter medium (4) and the outer wall of the outer frame (1); the outer wall of the second sealing member (3) is interference-fitted with the inner wall of the filter housing (300) to form a radial seal; The first sealing member (2) is arranged on the outer wall of the air inlet end of the outer frame (1), and the top surface and the bottom surface are respectively a first sealing surface (6) and a second sealing surface (7). The outer frame (1) is pressed against the sealing surface B (301) of the filter housing (300) through the first sealing surface (6) and the sealing surface A (201) of the filter front cover (200). The first sealing surface (6) and the sealing surface A (201) form a first axial seal, and the second sealing surface (7) and the sealing surface B (301) form a second axial seal.

2. An air filter element according to claim 1, characterized in that: The outer frame (1) further comprises a stepped flow groove (8) and a positioning step (9), wherein the positioning step (9) is arranged on the inner side surface of the air inlet end of the outer frame (1), and the filter medium (4) is arranged in the outer frame (1) via the positioning step (9); The step flow groove (8) is annularly arranged on the side of the air inlet end of the outer frame (1) and extends out of the side of the outer frame (1); the first sealing member (2) is wrapped around the top surface, bottom surface and side surface of the step flow groove (8); and the outer frame (1) is arranged on the sealing surface B (301) of the filter housing (300) through the step flow groove (8) and the first sealing member (2).

3. An air filter element according to claim 2, characterized in that: The outer frame (1) further comprises one or more accommodating portions (10), wherein the accommodating portion (10) is a hollow protrusion on the stepped flow groove (8), and the bottom surface of the accommodating portion (10) is communicated with the interior of the protrusion. The first sealing member (2) is wrapped around the bottom surface and side surface of the lower end of the accommodating portion (10). The inner wall of the filter housing (300) is provided with a protrusion (11) that can extend from the bottom of the accommodating portion (10) and cooperate with the accommodating portion (10). The outer frame (1) is positioned on the sealing surface B (301) of the filter housing (300) through the accommodating portion (10) and the protrusion (11).

4. The air filter element according to claim 2, characterized in that: The outer side of the step flow groove (8) is uniformly toothed.

5. The air filter element according to claim 1, characterized in that: The bottom of the inner side surface of the air outlet end of the outer frame (1) is an inclined annular surface (12), and a colloid containing space (13) is formed between the annular surface (12) and the outer surface of the filter medium (4). The second sealing member (3) bonds the filter medium (4) and the open end of the outer frame (1) together through the colloid containing space (13).

6. The air filter element according to claim 1, characterized in that: The outermost circumferential surface of the second sealing member (3) is a radial sealing surface (14), the bottom end of the radial sealing surface (14) is provided with a guiding inclined surface (15), and the inner wall of the filter housing (300) passes through the guiding inclined surface (15) and is interference-fitted with the radial sealing surface (14) to form a radial sealing band (16).

7. The air filter element according to claim 1, characterized in that: The filter medium (4) is a direct-flow filter structure, comprising a first corrugated filter material (17) and a second corrugated filter material (18), wherein the corrugations of the first corrugated filter material (17) and the second corrugated filter material (18) are vertically cross-distributed and respectively comprise one or more rows of first wave crests (19) and second wave crests (20).

8. The air filter element according to claim 1, characterized in that: The handle (5) is arranged at the air inlet end of the outer frame (1) via a connecting rib.

9. The air filter element according to claim 1, characterized in that: The first sealing surface (6) and the second sealing surface (7) of the first sealing member (2) are respectively flat surfaces without undulations.

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