Filter element of air filter

Abstract

The invention provides an air filter element which comprises an outer frame, a first sealing piece, a filter medium and a second sealing piece, the outer frame is in a shell shape with a handle at the air inlet end, the filter medium is arranged in the outer frame, and the second sealing piece is bonded and sealed on the outer frame and the air outlet end of the filter medium. The bottom surface of the second sealing component is adhered to the edge of the bottom surface of the filtering medium and the bottom surface of the outer frame, the side surface of the second sealing component is adhered to a gap between the outer frame and the filtering medium and the outer side wall of the outer frame, and the outer side wall of the second sealing component is in interference fit with the inner wall of the filter shell to form radial sealing; the first sealing piece is arranged on the outer wall of the air inlet end of the outer frame, the top face and the bottom face of the first sealing piece are a first sealing face and a second sealing face respectively, the outer frame is arranged on a sealing face B of the filter shell in a pressing mode through the first sealing face and a sealing face A of the filter front cover, and the first sealing face and the sealing face A form first axial sealing. And the second sealing surface and the sealing surface B form 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 is composed of a media pack, a housing, a frame member and a sealing member (see its specification). Fig.13 );

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

[0005] Similarly, Donaldson patent CN105555389B (divisions CN107715607B, CN107715608B, CN111603867B, CN114887415B) also discloses a filter element structure consisting of a media pack, a housing, a frame member and a sealing member, wherein the sealing member 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 a 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 the filter element of this type of filter element structure is: the medium pack is first placed in the shell and positioned against the bottom of the shell, and then the frame member is placed on the head of the medium pack, and the frame member is positioned against the head of the medium pack. A gap is left between the frame member and the shell sealing member, and the sealing member is integrally foamed and formed by polyurethane material. During the molding process, the polyurethane material fills the gap between the three and bonds the frame member, the shell, and the medium pack together to form the final sealing member structure (Figure 57C / 57D in the CN105555389B patent specification). This technical solution requires that the frame member and the shell have a high degree of structural coordination and positioning coordination with the medium pack, making the frame member and the shell structure design more complicated. At the same time, the sealing member molding process needs to ensure that the frame member, the shell, and the medium pack are firmly bonded at the same time, which has high process requirements. The above 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 structural filter element adopts a clamping sealing structure, and 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 cause the axial sealing joint surface to be loose and seal failure, thereby causing 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 seal, a filter medium and a second seal, wherein 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, 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 side wall of the outer frame, and the outer side wall of the second seal assembly is interference fit 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 on 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 slot 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 surface, bottom surface and side surface 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 parts, which are hollow protrusions on the step flow groove, and the bottom surface of the accommodating part is connected to the inside of the protrusion. The first sealing component is wrapped around the bottom surface and side surface of the lower end of the accommodating part. The inner wall of the filter housing is provided with a protrusion that can extend from the bottom of the accommodating part and cooperate with the accommodating part. The outer frame is positioned on the sealing surface B of the filter housing through the accommodating part 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, and a guide 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 through the guide 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 respectively include 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, which uses only one outer frame plastic part, can save mold manufacturing costs, reduce manufacturing costs, and is provided with a receiving portion and a handle on the outer frame, which can facilitate axial positioning by using the receiving portion and the protrusion on the filter housing to cooperate with each other, and can also make the filter element more convenient to install and remove through the handle;

[0023] The second sealing member is used to bond and seal the outer frame and the air outlet end of the filter medium. Compared with the prior art which requires a sealing member, 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 foaming molding material and a preset mold tooling. The outer frame and the filter medium can be bonded as a whole during the foaming molding process of the second sealing member. In addition, the second sealing member can not only meet the sealing of its own structure, but also form a radial sealing belt through the interference fit between the filter element and the filter housing.

[0024] The present invention uses a double sealing structure: the first sealing component forms an axial seal at the air inlet end of the filter element, and the second sealing component forms a radial seal at the air outlet end of the filter element, and two sealing belts are formed at the air inlet end and the air outlet end of the filter element, which can not only improve the reliability of the filter element seal, but also use the radial sealing belt to limit the filter element, so that the filter element is not easy to loosen in the filter housing due to the long-term vibration of the air filter, and prevent the axial seal of the first sealing component from failing to seal due to the loosening of the filter element, thereby improving the stability of the seal.

[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 of

[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 middle and short side direction;

[0031] Figure 5 for Figure 4 A local enlarged schematic diagram of the middle A;

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

[0033] Figure 7 It 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] Fig. 9 for Figure 8 A partial enlarged schematic diagram of point C in the middle;

[0036] Fig.10 It is a schematic diagram of a half-section structure in the long side direction when the present invention is applied in a filter;

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

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

[0039] Fig.13 It is a schematic diagram of the structure of the filter medium in the present invention;

[0040] Fig.14 It is a schematic diagram of the airflow direction when the filter medium is filtering 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. accommodating portion, 11. protruding portion, 12. annular surface, 13. colloid accommodating space, 14. radial sealing surface, 15. guide slope, 16. radial sealing belt, 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 in conjunction with 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, wherein the outer frame 1 is in a shell shape with a handle 5 at the air inlet end, wherein the handle 5 is arranged at the air inlet end of the outer frame 1 through a connecting rib, the filter medium 4 is arranged in the outer frame 1 for filtering air, and the second sealing member 3 is foamed and molded on the filter medium 4 and the air outlet end of the outer frame 1 by using a polyurethane foaming molding material and a preset mold tooling, and is bonded and sealed on 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 a 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 the outer side 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, and the outer side wall of the second sealing member and the inner wall of the filter housing 300 are interference-fitted to form a radial seal.

[0046] 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 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 by the first sealing surface 6 and the sealing surface A201 of the filter front cover 200. Fig.10 , Fig.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 is 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 the first sealing surface 6 and the second sealing surface 7 of the first seal 2 after foaming are respectively flat surfaces without undulations.

[0048] Specifically, 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 through the first sealing member 2, the outer frame 1 further includes a step flow slot 8 and a positioning step 9, wherein 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, and the filter medium 4 is disposed in the outer frame 1 through the positioning step 9;

[0049] 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 seal 2 is wrapped on the top surface, bottom surface and side surface of the step flow groove 8. In order to facilitate the polyurethane foam molding material to flow to the bottom of the step flow groove 8 and make the first seal 2 foamed, in this embodiment, the outer side of the step flow groove 8 is uniformly serrated, and the outer frame 1 is arranged on the sealing surface B301 of the filter housing 300 through the step flow 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, preferably two receiving portions 10 are symmetrically arranged on the step flow groove 8. Specifically, as Fig. 9 , Fig.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 component 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, and 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 , Fig.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 , Fig.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 Fig.13 , Fig.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.

[0054] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An air filter element, characterized in that: It comprises an outer frame (1), a first sealing component (2), a filter medium (4) and a second sealing component (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 component (3) is bonded and sealed on the outer frame (1) and the air outlet end of the filter medium (4); the bottom surface of the second sealing component (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 side wall of the outer frame (1); the outer side wall of the second sealing component 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 a sealing surface B (301) of the filter housing (300) through the first sealing surface (6) and a 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 step 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 arranged in an annular shape 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), the bottom surface of the accommodating portion (10) is connected to the inside of the protrusion, the first sealing component 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), and 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. An air filter element according to claim 2, characterized in that: The outer side of the step flow groove (8) is in a uniform tooth shape.

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. An 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), a guiding inclined surface (15) is provided at the bottom end of the radial sealing surface (14), 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 belt (16).

7. An 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. An 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 connecting ribs.

9. An 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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