CN108993055B

CN108993055B - Filter element assembly

Info

Publication number: CN108993055B
Application number: CN201811149010.6A
Authority: CN
Inventors: 尹名欢; 严华
Original assignee: Mahle Automobile Technology China Co ltd
Current assignee: Mahle Automobile Technology China Co ltd
Priority date: 2018-09-29
Filing date: 2018-09-29
Publication date: 2023-09-15
Anticipated expiration: 2038-09-29
Also published as: CN108993055A

Abstract

The application provides a filter element assembly, which comprises a first filter element and a second filter element, wherein the first filter element and the second filter element are formed by alternately carrying out peak folding and valley folding on filter materials, each time a crease is formed by folding, the first filter element is in a cylinder shape with an annular cross section, the second filter element is arranged on the inner periphery of the first filter element, and a first sealing piece is arranged between the first filter element and the second filter element along the circumferential direction; the two end faces of the first filter element in the crease length direction are a first end face and a second end face, the second filter element is provided with a third end face which faces the first end face identically and a fourth end face which faces the second end face identically, air can flow into the filter element assembly from the first end face, the third end face and the outer peripheral face of the first filter element, and filtered by the filter material and flows out of the filter element assembly from the second end face, the fourth end face and the inner peripheral face of the first filter element. The axial air inlet area of the filter element assembly is enlarged, the air inflow of the filter element assembly under the same appearance volume is large, and the filter element has large filtering capability and large dust holding capacity.

Description

Filter element assembly

Technical Field

The present application relates to the field of filters for fluid filtration, in particular air filtration, and in particular to a filter element assembly of a filter.

Background

Referring to fig. 1 to 3, there is shown a cartridge assembly for an air cleaner for a vehicle, the cartridge assembly comprising a cartridge 1, a mounting bracket 2, a first end cap 3 and a second end cap 4. The filter element 1 is formed into a cylinder by folding filter paper, folds of the filter paper extend along the axial direction of the filter element 1, and the filter element 1 is integrally sleeved on the periphery of the cylinder-shaped fixing support 2 so as to be fixed. In order to filter air through the filter paper, the axial direction of the cartridge assembly is set closed, using a first end cap 3 of substantially circular shape on one side of the cartridge first end face 102 to close the cartridge central bore 101 and the cartridge first end face 102, and an annular second end cap 4 on one side of the cartridge second end face 103 to close the cartridge second end face 103. So that unfiltered air 501 can only flow into the filter element 1 from the outer periphery of the filter element 1 and pass through the filter paper into the inner periphery of the filter element 1 and then flow out from the middle holes 101 on the second end face 103 side.

The filter element assembly has poor arrangement flexibility and limited filtering capacity.

Disclosure of Invention

The application aims to overcome or at least alleviate the defects in the prior art and provide a filter element assembly which effectively utilizes the space and the filter material area of the filter element assembly and reduces the air inlet resistance.

The application provides a filter element assembly, which comprises a first filter element and a second filter element, wherein the first filter element and the second filter element are formed by alternately carrying out peak folding and valley folding on filter materials, each folding forms a crease, the first filter element is in a cylinder shape with an annular cross section, the second filter element is arranged on the inner periphery of the first filter element,

a first seal is circumferentially disposed between the first and second filter elements to prevent unfiltered air from passing through a gap between the first and second filter elements;

the two end faces of the first filter element in the length direction of the crease are a first end face and a second end face respectively, the second filter element is provided with a third end face which faces the first end face the same and a fourth end face which faces the second end face the same,

air can flow into the filter element assembly from the first end face, the third end face and the first filter element outer peripheral face, is filtered by the filter material, and flows out of the filter element assembly from the second end face, the fourth end face and the first filter element inner peripheral face; or,

air can flow into the filter element assembly from the second end face, the fourth end face and the first filter element inner peripheral face, be filtered by the filter medium, and flow out of the filter element assembly from the first end face, the third end face and the first filter element outer peripheral face.

In at least one embodiment, one folding piece is defined between two adjacent folds, an outer opening folding piece clamp is formed by two folding pieces connected by the folds on the inner peripheral surface of the first filter element, an inner opening folding piece clamp is formed by two folding pieces connected by the folds on the outer peripheral surface of the first filter element,

each of the outer opening flaps is sealingly connected between a pair of edges on the second end face, and each of the inner opening flaps is sealingly connected between a pair of edges on the first end face.

In at least one embodiment, the crease of the second cartridge extends from the third end face to the fourth end face, and two adjacent flaps on the second cartridge form one flap clip, each flap clip being sealingly connected at least one of a pair of edges on the third end face and a pair of edges on the fourth end face.

In at least one embodiment, the folds of the second cartridge are located at the third end face and the fourth end face.

In at least one embodiment, the distance between the peripheral edge of the first filter element and the axial centerline of the first filter element becomes progressively greater from the first end face to the second end face.

In at least one embodiment, the peripheral edge of the cross-section of the first cartridge is circular, oval, or polygonal.

In at least one embodiment, a gap is provided between the inner periphery of the first filter element and the second filter element on a side of the first seal member axially facing the fourth end face.

In at least one embodiment, the first seal is located at the first end face.

In at least one embodiment, the cartridge assembly further comprises an annular second seal member in intimate contact with an end of the first cartridge peripheral surface proximate the second end face, the second seal member for sealing a gap between the second end face and the cartridge assembly outer housing.

In at least one embodiment, the peripheral edge of the cross section of the first filter element is generally elliptical and the curvature of the circular arc curves at the ends of the major axis are not equal;

the filter element assembly comprises a positioning interface, wherein the positioning interface comprises a positioning concave part which is defined by the concave of the outer peripheral wall of the second sealing piece towards the inner peripheral direction, and the distance between the positioning concave part and the two ends of the long shaft is unequal;

the positioning interface is not penetrated in the radial direction of the filter element assembly.

In at least one embodiment, the cartridge assembly further comprises a securing bracket comprising:

the filter element comprises a cylindrical fixing support body, wherein the first filter element is sleeved on the outer periphery of the fixing support body, and the second filter element is arranged on the inner periphery of the fixing support body;

the second filter element containing shell is located the fixed bolster main part is close to the one end of first terminal surface and link up in the axial, the second filter element set up in the second filter element containing shell.

In at least one embodiment, the fixing bracket further comprises an annular fixing bracket base, the fixing bracket base is connected with the fixing bracket main body, and the fixing bracket base is supported on the second end face.

In at least one embodiment, the filter element assembly further comprises a second seal member for sealing the outer peripheral surface of the first filter element at the end where the second end face is located, the second seal member being fixed to the outer periphery of the fixed support base.

Compared with the prior art, the application has the advantages that:

set up the second filter core in first filter core, open first terminal surface, the second terminal surface with first filter core simultaneously in order to participate in the filtration for filter element assembly's filtration area obtains increasing, thereby reduces the air admission resistance that the air got into filter element assembly, improves the dust holding volume, and then improves filtration efficiency. Therefore, the axial end face of the cylindrical filter element is fully utilized, so that the filter element assembly with the same appearance volume has larger air inflow and dust holding capacity, and higher filtering capacity is obtained.

Drawings

Fig. 1 is an exploded schematic view of a prior art filter cartridge assembly.

Fig. 2 is a schematic view of a completed cartridge assembly corresponding to fig. 1.

Fig. 3 is a cross-sectional view of the cartridge assembly of fig. 2.

Fig. 4 is an exploded schematic view of a filter cartridge assembly according to a first embodiment of the present application.

Fig. 5 is a schematic view of a filter cartridge assembly according to a first embodiment of the present application (wherein the first filter cartridge is shown in part only).

Fig. 6 is a cross-sectional view of a filter cartridge assembly according to a first embodiment of the present application.

Fig. 7 is a schematic view of a first cartridge according to a first embodiment of the present application.

Fig. 8 is a top view of the first cartridge of fig. 7.

Fig. 9 is a cross-sectional view of the first cartridge of fig. 7 taken along line A-A of fig. 8.

Fig. 10 is a cross-sectional view of the first cartridge of fig. 7 taken along line B-B of fig. 9.

Fig. 11 is a schematic view of a filter pocket of the first filter cartridge according to the first embodiment of the application.

Fig. 12 is a top view of a fixing bracket according to a first embodiment of the present application.

Fig. 13 is a C-C cross-sectional view of the fixing bracket of fig. 12.

Fig. 14 is a D-D cross-sectional view of the fixing bracket of fig. 12.

Fig. 15 is a combined schematic of a first filter cartridge and a second filter cartridge according to one embodiment of the application.

Fig. 16 is a combined schematic of a first filter cartridge and a second filter cartridge according to an embodiment of the application.

Fig. 17 is a schematic view of a fixing bracket according to a second embodiment of the present application.

Fig. 18 is an enlarged schematic view of a portion outlined by a dotted line in fig. 17.

Fig. 19 is a partial schematic view of a filter cartridge assembly according to a second embodiment of the present application.

Reference numerals illustrate:

1, a filter element; 101 a filter element middle hole; 102 a first end face of the filter element; 103 a second end face of the filter element; 11 a first filter element; 12 a second cartridge; 1101 a first end face; 1102 a second end face; 1103 first cartridge inner peripheral surface; 1104 a first cartridge outer peripheral surface; 1201 a third end face; 1202 a fourth end face; 1105 flaps; 1106 the connection site; 1107 folds; 2, fixing a bracket; 201 a fixed bracket body; 202 a second cartridge housing; 203 a fixed support base; 204 securing the first side of the bracket; 205 securing the second side of the bracket; 206 positioning a skeleton; 2061 positioning a framework bottom plate; 2062 positioning a skeleton side plate; 3 a first end cap; 4 a second end face cover; 501 unfiltered air; 502 filtered air; 61 a first seal; 62 a second seal; 621 positioning the concave part; i, a filter bag with an opening at the inner periphery; II, a filtering bag with an opening at the periphery; and d, a gap between the second filter element accommodating shell and the fixed support main body.

Detailed Description

Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific illustrations are for the purpose of illustrating how one skilled in the art may practice the application, and are not intended to be exhaustive of all of the possible ways of practicing the application, nor to limit the scope of the application.

First embodiment:

referring first to fig. 4-16, a filter cartridge assembly according to a first embodiment of the present application is described.

For convenience of description, unless otherwise specified, the direction of the central axis of the cylindrical fixing bracket 2 is hereinafter defined as "axial direction", the direction perpendicular to the axial direction is defined as "radial direction", the direction indicated by the arrow in fig. 4 is defined as "upper" direction, the direction opposite to the upper direction is defined as "lower" direction, and the direction description of the other components of the cartridge assembly follows this definition. It will be appreciated that the above-defined directions are relative and are not intended to limit the application of the application, as the cartridge assembly may assume various spatial orientations during actual installation and use.

The filter cartridge assembly according to the first embodiment of the present application includes a first filter cartridge 11 and a second filter cartridge 12. The first filter element 11 has a tubular shape with a circular cross section, and the circular cross section may be, for example, any circular shape such as a circle, an ellipse, a polygon, or a special shape. In the present embodiment, the first filter element has a substantially elliptical cross section, and the second filter element 12 has a substantially rectangular parallelepiped cross section, which is provided in the middle hole of the cylindrical first filter element 11. The first filter element 11 serves as a primary filter element, the second filter element 12 serves as a secondary filter element, and air can pass through the first filter element 11 axially and circumferentially, and air can pass through the second filter element 12 axially and be filtered.

To facilitate the fixing of the first filter cartridge 11 and the second filter cartridge 12, the filter cartridge assembly further includes a fixing bracket 2, the fixing bracket 2 including a fixing bracket body 201 for supporting an inner peripheral surface of the first filter cartridge, a second filter cartridge housing case 202 for housing and fixing the second filter cartridge, and a fixing bracket base 203 for supporting the first filter cartridge at the second end surface. The outer peripheral surface of the fixing bracket main body 201 is adapted to the inner peripheral surface of the first filter element in size and shape, and has a substantially elliptical flat tubular cross section as shown in fig. 4.

The lower portion of the holder body 201 projects outwardly Zhou Fu with an annular shelf surrounding the holder body 201, which shelf forms a holder base 203, the holder base 203 extending axially out of the central bore of the first cartridge 11 and being supported on the second end surface 1102. The second cartridge housing case 202 is located at an upper portion of an inner periphery of the fixing bracket main body 201, and the second cartridge housing case 202 is axially penetrated to allow air to pass therethrough.

Both the first filter element 11 and the second filter element 12 are formed by alternately folding the filter paper in the front direction and in the back direction (i.e., alternately folding the filter paper in the front direction) with the filter paper alternately in the valley direction. Taking the first filter element 11 as an example (see fig. 7), after one peak and valley fold of the filter paper, three flaps 1105 are formed, and two sides of each flap 1105 are provided with folds 1107. The first filter element 11 is fitted over the outer periphery of the holder main body 201 in a posture in which its fold 1107 extends in the axial direction of the holder 2. The second cartridge 12 is housed in the second cartridge housing case 202 in such a manner that the fold thereof extends from the third end face 1201 to the fourth end face 1202.

The two end faces of the first filter element 11 in the direction of the fold 1107 are a first end face 1101 and a second end face 1102, the end face of the second filter element 12 facing the same direction as the first end face 1101 is a third end face 1201, and the end face of the second filter element 12 facing the same direction as the second end face 1102 is a fourth end face 1202. The first 1101 and third 1201 end faces upward of the cartridge assembly.

A first seal 61 of generally annular shape is provided between the inner peripheral edge of the first end face 1101 and the outer peripheral edge of the third end face 1201, the first seal 61 being capable of sealing a gap between the first end face 1101 and the third end face 1201. It should be understood that the gap between the first end face 1101 and the third end face 1201 being sealed means that unfiltered air 501 cannot pass through the cartridge assembly in an axial direction from the mating gap of the first cartridge 11 and the second cartridge 12 without penetrating the filter paper, and that the first seal 61 is preferably axially as close to the first end face 1101 and/or the third end face 1201 as possible, but the present application is not limited to the axial position of the first seal 61 relative to the first end face 1101 and the third end face 1201, e.g., the axial position of the first seal may be lower than the first end face, so long as unfiltered air is prevented from entering from the gap between the first and second cartridges.

The outer peripheral edge of the second end surface 1102 is provided with an annular second seal 62 to prevent unfiltered air 501 from flowing between the outer peripheral edge of the second end surface 1102 and the outer housing (not shown) of the cartridge assembly, the outer peripheral surface of the first cartridge being in intimate contact with the second seal 62 in a region proximate one end of the second end surface 1102. For convenience and stability of installation, the second sealing member 62 may be supported on the fixing support base 203, for example, the fixing support base 203 is provided with an axially extending engagement structure along its periphery, and the second sealing member 62 is correspondingly provided with a matching engagement structure, where the two engagement structures are engaged with each other in the axial direction during assembly, as shown in the figure, one of the two engagement structures is an axial flange, and the other is an axial groove.

A third seal (not shown) is provided between the outer peripheral edge of the second cartridge 12 and the inner wall of the second cartridge housing case 202 to prevent unfiltered air 501 from flowing out between the outer peripheral edge of the second cartridge 12 and the inner wall of the second cartridge housing case 202.

It should be appreciated that the tightness of the first, second and third seals 61, 62 is such that their barrier properties to unfiltered air 501 are at least not inferior to the filter papers of the first and second cartridges 11, 12, preferably the first, second and third seals 61, 62 are PU glue.

The cartridge assembly described above allows air to flow into the cartridge assembly from the first end face 1101, the third end face 1201, and the first cartridge outer peripheral surface 1104, and out of the cartridge assembly from the second end face 1102, the fourth end face 1202, and the first cartridge inner peripheral surface 1103. It should be appreciated that air may also flow into the cartridge assembly from the second end surface 1102, the fourth end surface 1202, and the first cartridge inner peripheral surface 1103 and out of the cartridge assembly from the first end surface 1101, the third end surface 1201, and the first cartridge outer peripheral surface 1104 under different filter flow configurations. In other words, the first end face, the third end face, and the outer peripheral surface of the first filter element form a first filter surface, the second end face, the fourth end face, and the inner peripheral surface of the first filter element form a second filter surface, and one of the first filter surface and the second filter surface is an air inlet surface, and the other is an air outlet surface.

In the following, only the case of the first air flow in and out will be described as an example, with reference to fig. 7 to 11, how the air flowing out of the cartridge assembly from the second end surface 1102, the fourth end surface 1202 and the first cartridge inner peripheral surface 1103 can be filtered.

Taking the first filter element 11 as an example, fig. 7 shows a folded filter paper having a substantially rectangular parallelepiped shape, which is obtained by expanding the substantially cylindrical first filter element 11, and one side corresponds to the first filter element inner peripheral surface 1103 and the other side corresponds to the first filter element outer peripheral surface 1104. Fig. 8 is a top view of fig. 7. Fig. 9 is a cross-sectional view of the first cartridge of fig. 7 taken along line A-A of fig. 8. Fig. 10 is a cross-sectional view of the first cartridge of fig. 7 taken along line B-B of fig. 9.

The edges of adjacent flaps 1105 on the first end face 1101 and the second end face 1102 are alternately sealingly connected by a connection 1106. It should be appreciated that the sealing of the connection 1106 is such that it is at least not inferior to the filter paper of the first filter element 11 and the second filter element 12 in terms of its barrier properties against unfiltered air 501, and that preferably the sealing material used for the connection 1106 is for example PU glue. An outer opening flap clip is formed by two flaps 1105 joined by a crease 1107 located on the inner peripheral surface 1103 of the first cartridge and an inner opening flap clip is formed by two flaps 1105 joined by a crease 1107 located on the outer peripheral surface 1104 of the first cartridge. Each outer opening flap is sealingly connected by a pair of connectors 1106 on the second end surface 1102 and each inner opening flap is sealingly connected by a pair of connectors 1106 on the first end surface 1101. Referring to fig. 11, each of the connecting portions 1106 intersects a crease 1107 to form a corner seal, and two flaps 1105 joined by the corner seal form a filter pocket having openings (both axially and radially). Two kinds of opening-oriented filter pockets are shown in fig. 8, i.e., an inner peripheral opening filter pocket I and an outer peripheral opening filter pocket II, respectively, with a connecting portion 1106 of the inner peripheral opening filter pocket I being located on the first end surface 1101 and a connecting portion 1106 of the outer peripheral opening filter pocket II being located on the second end surface 1102. Along the circumferential direction, the inner peripheral open filter pockets I and the outer peripheral open filter pockets II are alternately arranged adjacently, and adjacent inner peripheral open filter pockets I and outer peripheral open filter pockets II share one flap 1105.

Preferably, each of the connectors 1106 connects only a pair of adjacent flaps 1105, i.e., there is only one connector 1106 between a pair of adjacent flaps 1105 either on the first end 1101 or on the second end 1102, to facilitate the passage of air flow. Notably, to ensure that unfiltered air 501 flowing into the filter element assembly from both the first end face 1101 and the first filter element peripheral surface 1104 is filtered through the filter paper rather than leaking out of the filter element assembly from the gap between the edges of the flaps 1105, the connection 1106 needs to be: all of the two flaps 1105 of the peripheral open filter pocket II have a connection 1106 between them on the second end surface 1102, all of the two flaps 1105 of the peripheral open filter pocket I have a connection 1106 between them on the first end surface 1101, and there are no connections 1106 between two adjacent flaps 1105 on both the first end surface 1101 and the second end surface 1102.

Similarly, the folds of the second cartridge 12 extend in the axial direction of the fixed support 2, the edges of adjacent flaps on the third 1201 and fourth 1202 end faces being alternately sealingly connected. It should be appreciated that when the second cartridge 12 is not formed in a cylindrical shape having an annular cross-section, i.e., the second cartridge 12 is in a generally rectangular parallelepiped shape as shown in fig. 4, it is only necessary to ensure that each of the several flap clips formed by every two adjacent flaps is sealingly connected between at least one of a pair of edges located on the third end face 1201 and a pair of edges located on the fourth end face 1202. It should be understood that the above connection excludes all edges on the third end face 1201 from being connected together, otherwise air can hardly pass through the second cartridge 12 in the axial direction of the cartridge assembly.

The above arrangement of the first filter element 11 and the second filter element 12 is such that air having an axial component velocity can pass through the filter paper rather than the gap between the filter papers when flowing through the first filter element 11 and the second filter element 12, thereby achieving filtration.

In order that the second filter element 12 does not affect the filtering effect of the first filter element in the radial direction, referring to fig. 13 and 14, a gap d is provided between the second filter element housing case 202 and the fixing bracket main body 201, so that air entering the first filter element from the first filter element outer peripheral surface 1104 is not blocked by the second filter element 12. The size of the gap d may be different at circumferentially different locations and at axially different heights. Preferably, the gap d has a value between 5mm and 35 mm.

In addition, the second filter element 12 has an axial height to provide adequate dust holding capacity to meet a certain filtering effect, however, too much axial height of the second filter element 12 can adversely affect the flow of air through the filter element assembly. Preferably, the axial height of the second cartridge 12 is 10% to 30% of the axial height of the first cartridge 11.

The third end face 1201 may be flush with the first end face 1101, or may be higher or lower than the first end face 1101. When there is a height difference between the third end face 1201 and the first end face 1101, it is preferable that the height difference between the third end face 1201 and the first end face 1101 is not greater than 40mm so that air is not subjected to significant air intake resistance when flowing into the filter element assembly and so that the filter element assembly filters air more evenly.

Preferably, to provide a guide for air flowing through the cartridge assembly, the first cartridge 11 has a shape that is small at one end and large at the other end in the axial direction, and the distance between the outer peripheral edge of the first cartridge 11 and the axial center line thereof becomes gradually larger from the first end surface 1101 toward the second end surface 1102. Accordingly, there are also: the distance between the outer peripheral wall of the fixing bracket main body 201 and the axial center line of the fixing bracket main body 201 becomes gradually larger from the end near the second cartridge housing case 202 to the end far from the second cartridge housing case 202.

It should be understood that the flat tubular shape of the fixing bracket main body 201 with a substantially elliptical cross section is to enable the filter element assembly to adapt to a limited application space, and as described above, in other applications, the fixing bracket main body 201 may be tubular with a circular cross section, and the first filter element 11 sleeved on the outer periphery of the fixing bracket main body 201 may also be substantially cylindrical, as described above with reference to fig. 15. In addition, the fixing bracket main body 201 may be cylindrical with other cross-section.

It should be appreciated that the second cartridge 12 may have a different profile depending on the shape of the second cartridge housing 202. For example, referring to fig. 16, the second filter element 12 may also be cylindrical, in which case, in addition to ensuring that the first end 1101 and the third end 1201 are sealed in the axial direction, a seal (not shown) may be added to ensure that the annular middle portion formed by the third end 1201 is sealed. In addition, the number of the second cartridges 12 may be plural according to different arrangement modes of the second cartridge housing case 202.

Second embodiment:

next, a second embodiment of the present application will be described with reference to fig. 17 to 19. The second embodiment of the present application improves the fixing bracket base 203 and the second seal 62 compared to the first embodiment.

The cross section of the first filter element 11 may need to be provided in an asymmetric structure, for example, an outer peripheral edge of a generally elliptical annular cross section is asymmetric on both sides in the longitudinal direction thereof, with one side having a large curvature and the other side having a small curvature, due to restrictions in the vehicle interior space or the like. Accordingly, the fixation stent 2 has an asymmetric fixation stent first side 204 and a fixation stent second side 205. Since the cartridge assembly is required to fit into the outer housing, the asymmetric flat cylindrical cartridge assembly requires distinguishing between the mounting orientations of the sides of the unequal curvatures when installed into the outer housing, and the second embodiment of the present application provides a locating interface for distinguishing between the mounting orientations of the cartridge assemblies.

The positioning interface is formed by matching the positioning framework 206 positioned on the fixed support base 203 with the positioning concave portion 621 positioned on the second sealing member 62. The two positioning interfaces are respectively positioned at two sides of the short axis direction of the outer Zhou Tuoyuan of the cross section of the filter element assembly, the distances from the two positioning interfaces to the first side 204 of the fixed support are equal, the distances from the two positioning interfaces to the second side 205 of the fixed support are equal, but the distances from each positioning interface to the first side 204 of the fixed support are unequal to the distances from the two positioning interfaces to the second side 205 of the fixed support.

Wherein the positioning frame 206 includes a positioning frame bottom plate 2061 parallel to the peripheral wall of the stationary gantry base 203 at which the positioning frame 206 is mounted and two opposing positioning frame side plates 2062 extending in the axial direction of the stationary gantry body 201 and protruding toward the outer periphery of the stationary gantry base 203. The outer peripheral wall of the second seal 62 is recessed toward the inner peripheral portion at the positioning interface to define a positioning recess. Since the second seal 62 is wrapped around the outer periphery of the stationary bracket base 203, the positioning framework 206 and the positioning recess 621 cooperate to form a positioning interface that does not pass through in the radial direction of the cartridge assembly. It should be appreciated that the positioning recess 621 may also be through in the radial direction of the second seal 62, in which case the positioning skeleton base plate 2061 serves as the recessed deepest portion of the positioning interface recessed inward in the radial direction of the cartridge assembly, which blocks the through-penetration of the positioning interface in the radial direction of the cartridge assembly, thereby preventing unfiltered air from flowing out of the positioning interface, ensuring the sealing performance of the second seal 62. The locating interface is capable of mating with a locating feature (not shown) on the outer housing to which the cartridge assembly is mounted to facilitate locating of the cartridge assembly when mounted. The blind positioning interface preferably ensures the sealing properties of the second seal 62 against the outer circumference of the second end surface 1102 and the outer housing.

It should be appreciated that in other embodiments, the positioning interface may also be configured to be radially through the cartridge assembly, in which case the positioning framework 206 does not have a positioning framework base plate 2061.

It should be understood that in the event that the structural strength of the second seal 62 is sufficient, the positioning backbone 206 may be omitted and the positioning interface may be solely formed by the positioning recess 621.

It should be appreciated that the number of positioning interfaces is two, in order to enhance the stability of positioning in both directions. The present application does not limit the number of positioning interfaces, for example, one of the two positioning interfaces may be omitted while the other positioning interface is retained.

Third embodiment:

next, a third embodiment of the present application will be described. The third embodiment of the present application differs from the first embodiment in the orientation of the second cartridge 12.

Since the function of the second cartridge 12 is primarily to allow air to pass axially through the cartridge assembly from the interior annular space of the first end face 1101, the second cartridge 12 need not function to filter air in the circumferential direction of the cartridge assembly, and thus the second cartridge 12 may also be arranged with folds of its flaps at the third end face 1201 and fourth end face 1202. Since the third seal member is provided between the outer periphery of the second cartridge 12 and the inner wall of the second cartridge housing case 202, which has been described above, and is capable of preventing unfiltered air from passing axially through the gaps between the third end face 1201 and the fourth end face 1202 and the inner wall of the second cartridge housing case 202, respectively, there is no need to additionally seal the adjacent edges of any flaps of the second cartridge 12 that are clamped on the third end face 1201 and the fourth end face 1202.

The above-described embodiments of the present application may realize one or more of the following advantages:

(i) The second filter element 12 can enable air to flow through in the axial direction of the filter element assembly, so that the first end face cover 3 in the prior art is omitted, the air inlet resistance of the filter element assembly in the axial direction is reduced, the second filter element 12 has a filtering function, and the filtering capability of the filter element assembly is improved.

(ii) The arrangement of the connection 1106 of the first filter element 11 and the second filter element 12 in the present application allows air to flow through the entire filter element assembly in the axial direction, eliminating the second end cap 4 of the prior art, and particularly increasing the filter area of the first filter element 11.

(iii) The filter element component is in a shape with a large end and a small end in the axial direction, and can guide air to flow into the filter element component.

(iv) A locating interface is provided to facilitate installation of the cartridge assembly into the outer housing in the correct orientation when the cartridge assembly is of an asymmetric configuration.

It should be understood that the above-described embodiments are merely exemplary and are not intended to limit the present application. Those skilled in the art can make various modifications and changes to the above-described embodiments without departing from the scope of the present application. For example:

(i) The material of the first filter element 11 and the second filter element 12 is not limited to filter paper, and may be other materials having filtering ability, such as nonwoven fabric.

(ii) The filter cartridge assembly according to the present application is not limited to use with an air cleaner for a vehicle.

(iii) The filter cartridge assembly according to the present application is not limited to the filtration of air, but may be used for the filtration of other fluids when the first filter cartridge 11 and the second filter cartridge 12 are made of suitable materials.

Claims

1. A filter element assembly comprises a first filter element and a second filter element, wherein the first filter element and the second filter element are formed by alternately folding filter materials in a peak-to-valley mode, each time a crease is formed by folding, the first filter element is in a cylinder shape with an annular cross section, the second filter element is arranged on the inner periphery of the first filter element, the axial height of the second filter element is 10-30% of the axial height of the first filter element,

2. The filter cartridge assembly of claim 1 wherein adjacent ones of said folds define a flap therebetween, said two flaps joined by a fold located on said first filter cartridge inner peripheral surface define an outer open flap clamp, said two flaps joined by a fold located on said first filter cartridge outer peripheral surface define an inner open flap clamp,

3. The filter cartridge assembly of claim 1, wherein a crease of the second filter cartridge extends from the third end face to the fourth end face, two adjacent flaps on the second filter cartridge forming a flap clip, each flap clip sealingly connected at least one of a pair of edges on the third end face and a pair of edges on the fourth end face.

4. The filter cartridge assembly of claim 1, wherein the folds of the second filter cartridge are located in the third end face and the fourth end face.

5. The filter cartridge assembly of claim 1, wherein a distance between the peripheral edge of the first filter cartridge and an axial centerline of the first filter cartridge progressively increases from the first end face to the second end face.

6. The filter cartridge assembly of claim 1, wherein the peripheral edge of the cross-section of the first filter cartridge is circular, oval, or polygonal.

7. The filter cartridge assembly of claim 1, wherein a gap is provided between an inner periphery of the first filter cartridge and the second filter cartridge on a side of the first seal member axially facing the fourth end face.

8. The filter cartridge assembly of claim 1, wherein the first seal member is located at the first end face.

9. The filter cartridge assembly of claim 1, further comprising an annular second seal member in intimate contact with an end of the first filter cartridge peripheral surface proximate the second end face, the second seal member for sealing a gap between the second end face and an outer housing of the filter cartridge assembly.

10. The filter cartridge assembly of claim 9, wherein the peripheral edge of the cross-section of the first filter cartridge is generally elliptical and the curvature of the circular arc curves at both ends of the major axis are not equal;

11. The filter cartridge assembly of claim 1, further comprising a securing bracket comprising:

12. The filter cartridge assembly of claim 11, wherein the mounting bracket further comprises an annular mounting bracket base, the mounting bracket base being coupled to the mounting bracket body, the mounting bracket base being supported on the second end face.

13. The filter cartridge assembly of claim 12, further comprising a second seal member for sealing an outer peripheral surface of the first filter cartridge at an end at which the second end face is located, the second seal member being secured to an outer periphery of the fixed bracket base.