CN209917510U - Cylinder type filter element - Google Patents

Abstract

The utility model provides a cartridge filter element, it is including being cylindric filter medium (100) and upper end cover (300) and lower end cover (400) that set up respectively at the axial both ends of filter medium (100), upper end cover (300) cover mesopore (103) of filter medium (100) at the axial one end of filter medium (100) at least, lower end cover (400) are the annular, lower end cover (400) cover the peripheral part of lower terminal surface (102) of filter medium (100) at least, filter medium (100) are formed by filter media through peak folding and valley folding alternately, every two adjacent flaps are sealed connection by the alternative on upper end surface (101) or lower terminal surface (102) of filter medium (100), at least one of upper end surface (101) and lower terminal surface (102) have at least partly not by the region of upper end cover (300) or lower end cover (400) cover, make fluid can pass through the filter element axially and obtain filtering. The effective filtering area of the filter element is increased.

Description

Cylinder type filter element

Technical Field

The utility model relates to a filter field, it is used for fluid filtration, especially filtration, specifically relates to the cylinder filter core of filter.

Background

Aiming at the problem of environmental pollution caused by the tail gas of the motor vehicle, the national requirements on the tail gas emission of the motor vehicle are increasingly strict, and particularly in the field of trucks. One solution to reduce truck emissions is to provide urea tanks and other exhaust after-treatment devices to treat the exhaust, which are arranged to compress the space in which the engine air filter is installed.

Fig. 1 shows a cross-sectional view of a known filter cartridge for an air cleaner for a vehicle, which includes a filter medium 10, a frame 20, an upper end cap 30, and a lower end cap 40. The filter medium 10 is folded by filter paper to form a cylinder shape, the fold of the filter paper extends along the axial direction of the cylinder-shaped filter medium 10, and the filter medium 10 is integrally sleeved on the periphery of the cylinder-shaped framework 20 to be fixed.

In order to filter air passing through the filter paper, both end faces in the axial direction of the filter medium 10 are closed, and the central hole 103 penetrating the axial direction of the filter medium 10 is also closed at one end so that the unfiltered air 501 cannot pass directly. Specifically, one end of the center hole 103 and the upper end surface 101 of the filter medium 10 are covered with a substantially circular upper end cap 30 on the side of the upper end surface 101 of the filter medium 10, and the lower end surface 102 of the filter medium 10 is covered with an annular lower end cap 40 on the side of the lower end surface 102 of the filter medium 10.

In the filtering process of the air, the unfiltered air 501 flows into the filter medium 10 from the outer peripheral side of the filter medium 10, then passes through the filter paper into the inner peripheral side of the filter medium 10, and finally flows out from the center hole 103. In other words, the air filtering by the filter medium 10 is performed in the radial direction, and the filtering surface of the filter medium 10 for the air is the circumferential surface of the filter medium 10, that is, the air is filtered while flowing in from the outer circumferential side and flowing out from the inner circumferential side of the filter medium 10.

Because the arrangement space for the filter element is limited, and the processing surface of the filter medium 10 of the filter element for air is limited to the circumferential surface of the filter medium 10, the processed filtered air 502 must be guided through the middle hole 103 and then flows out of the filter element, so the filter area of the filter element is limited, and the filter efficiency is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome or alleviate the not enough of above-mentioned prior art existence at least, provide a filter core in order to increase filter element filter area in effective utilization space.

The utility model provides a cylinder type filter element, which comprises a cylinder type filter medium, an upper end cover and a lower end cover which are respectively arranged at the two axial ends of the filter medium, and is characterized in that,

the upper end cap covers at least a central hole of the filter medium at one axial end of the filter medium,

the lower end cover is annular and at least covers the peripheral part of the lower end surface of the filter medium,

the filter medium is formed by filter material through alternately peak folding and valley folding, each folding forms a crease line, the crease line extends along the axial direction of the filter medium, a folding sheet is defined between two adjacent crease lines, the edges of each two adjacent folding sheets on the upper end surface or the lower end surface of the filter medium are alternately connected in a sealing way,

at least one of the upper end face and the lower end face has an area at least partially uncovered by the upper end cap or the lower end cap such that fluid can pass axially through the filter element and be filtered.

In at least one embodiment, the upper end cap further covers an upper end face of the filter media to prevent fluid flow therethrough, the lower end cap not covering an inner peripheral portion of the lower end face but separating the lower end face and an outer peripheral face of the filter media as a seal;

fluid can flow into the filter element from an outer peripheral portion of the filter medium and flow out of the filter element from the other axial end of the center hole of the filter medium and an inner peripheral portion of the lower end face; or

Fluid can flow into the filter element from the other axial end of the center hole of the filter medium and the inner peripheral portion of the lower end surface, and can flow out of the filter element from the outer peripheral portion of the filter medium.

In at least one embodiment, two of the flaps connected to the inner circumferential fold located on the inner circumferential surface of the filter media form an outer open flap clamp,

a pair of edges of each of the outer opening flap clips on the lower end surface are sealingly connected at least at an inner peripheral portion of the outer opening flap clip to form a connecting portion that is radially contiguous with the lower end cap.

In at least one embodiment, at least a portion of the upper end surface is uncovered by the upper end cap to allow fluid flow therethrough, the lower end surface is completely covered by the lower end cap to prevent fluid flow therethrough,

fluid can flow into the filter element from the outer peripheral portion and the upper end surface of the filter medium, and can flow out of the filter element from the other axial end of the central hole of the filter medium; or

Fluid can flow into the filter element from the other axial end of the center hole of the filter medium and flow out of the filter element from the outer peripheral portion and the upper end surface of the filter medium.

In at least one embodiment, two of the flaps connected to the peripheral fold on the outer peripheral surface of the filter media form an open-ended flap clip,

a pair of edges of each of the open-ended flap clips at the upper end face are sealingly connected to form a joint.

In at least one embodiment, the maximum outer diameter of the lower end cap is greater than the outer diameter of the lower end face of the filter media and is formed with a radial flange that partially surrounds the outer peripheral surface of the filter media.

In at least one embodiment, the filter cartridge further comprises a framework including a cylindrical body and an end frame connected to one axial end of the body, the end frame extending annularly radially outward of the body,

the inner circumference of the filter medium is sleeved on the outer circumference of the main body, and the lower end face of the filter medium abuts against the end frame.

In at least one embodiment, the radially outer end of the end frame has a rim folded axially toward the filter media, the filter media being radially sandwiched between the body and the rim.

In at least one embodiment, an end of the end frame facing away from the filter media projects away from the filter media to form an annular flange, and portions of the end frame and the flange serve as a support frame for supporting the lower end cap.

In at least one embodiment, the lower end cap is a rubber member, and the end frame and the flange are embedded in the rubber member.

Compared with the prior art, the application has the advantages that: fluid (e.g., air) can flow axially into and out of the filter element to be filtered, increasing the effective filter area of the filter element.

Drawings

Fig. 1 is a cross-sectional view of a known filter cartridge.

Fig. 2 is an exploded schematic view of a filter cartridge according to a first embodiment of the present invention.

Fig. 3 is a schematic perspective view of the filter element corresponding to fig. 2.

Fig. 4 to 6 are developed schematic views of a filter medium according to a first embodiment of the present invention.

Fig. 7 is a schematic view of the filter cartridge corresponding to fig. 3 for air filtration.

Fig. 8 is a cross-sectional view of fig. 7.

Fig. 9 is an exploded schematic view of a filter cartridge according to a second embodiment of the present invention.

Fig. 10 is a schematic view of the filter cartridge of fig. 9 for air filtration.

Fig. 11 is a sectional view of fig. 10.

Fig. 12 is a schematic view of a pair of flaps of a filter media according to a first embodiment of the present invention.

Description of reference numerals:

10. 100 a filter medium; 101, an upper end surface; 102 lower end surface; 103 mesopores; 104 folding sheets; 105 folding marks; 1051 inner peripheral creases; 1052 peripheral creases; 106 a connecting part;

20 a framework; 201 a main body; 202 an end frame; 203, edge covering; 204 flange;

300, an upper end cover;

40. 400 lower end cap; 401 a radial flange; 402 an axial projection;

501 unfiltered air; 502 has filtered the air.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the invention, and is not intended to exhaust all possible ways of practicing the invention, nor is it intended to limit the scope of the invention.

The cartridge filter element according to the invention (hereinafter also referred to simply as filter element) is described by way of example in the context of an air filter for a truck. In the following detailed description, unless otherwise specified, "radial", "axial", and "circumferential" of the present invention are defined with reference to the radial, axial, and circumferential directions of the cylindrical filter medium 100. The "upper" and "lower" directions are defined with reference to the corresponding up and down orientations in fig. 2, to which the directional descriptions of the other components of the filter element assembly follow. It should be understood that the above-defined directions are relative and are not intended to limit the utility model, and the filter element can present different spatial postures during the actual installation and use.

(first embodiment)

Referring first to fig. 2 to 8, a cartridge filter cartridge according to a first embodiment of the present invention will be described.

Referring to fig. 2, 3 and 8, a cartridge type filter cartridge according to the present invention includes a filter medium 100, a frame 20, an upper end cap 300 and a lower end cap 400. The filter medium 100 is folded by filter paper to form a cylindrical shape, and the cylindrical filter medium 100 is integrally fitted around the outer circumference of the cylindrical frame 20 to be fixed. An upper end cap 300 and a lower end cap 400 are provided at both end surfaces of the filter medium 100 in the axial direction, respectively. The upper cap 300 covers the entire upper end surface 101 of the filter medium 100, and the lower cap 400 covers the outer circumferential portion of the lower end surface 102 of the filter medium 100.

The utility model discloses an aspect has changed filter media 100's folding and closed mode, and on the other hand has changed the coverage area of lower end cover 40 to make filter media 100 can not only radially filtered air, can filter air in the axial moreover. By the above change, the filtration area of the filter medium 100 is increased.

The following first describes the variation of the present embodiment to the manner in which the filter media 100 is folded and closed.

Fig. 4 is a schematic diagram showing the folding of the filter paper of the filter medium 100, and the filter paper shown in fig. 4 may be understood as a filter paper folded in a substantially rectangular parallelepiped shape obtained by spreading the cylindrical filter medium 100. The filter media 100 is formed from filter paper that has been alternately peak folded and valley folded (i.e., the filter paper is alternately folded in the forward direction and in the reverse direction). After the filter paper is subjected to one peak folding and valley folding, three folding sheets 104 are formed, and two sides of each folding sheet 104 are provided with folding marks 105. The filter medium 100 is sleeved on the frame 20 in a state that the fold 105 extends along the axial direction of the frame 20.

Fig. 5 shows a filter medium 100 as part of 8 consecutive flaps 104 (the dotted circle in the figure schematically shows the upper end face 101 of the filter medium 100). The edges of adjacent flaps 104 on the lower end face 102 are alternately sealingly connected to the connecting portions 106. To explain the specific arrangement position of the connection portion 106, the fold 105 located at the inner peripheral surface of the filter medium 100 is defined as an inner peripheral fold 1051, and the fold 105 located at the outer peripheral surface of the filter medium 100 is defined as an outer peripheral fold 1052. The two flaps 104 adjacent to the inner peripheral fold 1051 form an outer open flap clamp. A connecting portion 106 is provided on the edge of each outer open flap clip on the lower end face 102. The sealing property of the connection portion 106 is exhibited such that its barrier property against the unfiltered air 501 is not inferior to at least the filter paper of the filter medium 100, and preferably, the sealing material used for the connection portion 106 is, for example, a hot melt adhesive.

Fig. 6 shows a schematic view of an outer-opening flap clip, the two flaps 104 that make up an outer-opening flap clip being joined together at the inner peripheral portion (i.e., at inner peripheral fold 1051) and lower end surface 102, i.e., the outer-opening flap clip has a corner seal at the inner peripheral portion and lower end surface 102. Unfiltered air 501 may be filtered radially, or axially, through the outer open flap clip, and the air flowing out of the outer open flap clip is filtered air 502.

The above-described folding and closing of the filter medium 100 provides the filter medium 100 with a filtering capacity also at its lower end face 102. It should be understood that the sealingly connected connection 106 functions to block the passage of air, particularly the passage of unfiltered air 501 directly, and thus the present invention refers to air being filtered axially through the filter media 100, or the lower end face 102 of the filter media 100 having filtering capacity, or the flow of air through the lower end face 102 actually means that air can be filtered through the filter media 100 near the connection 106. And because the portion of lower end face 102 between the two outer open flap clamps is not sealingly connected, filtered air 502 is able to flow out of filter media 100 in a generally axial flow direction from the gap between the two outer open flap clamps (two adjacent connections 106).

On this basis, the improvement of the lower end cap 400 of the present invention will be described next.

Referring to fig. 7 and 8, the lower cap 400 of the present invention covers only the outer peripheral portion of the lower end surface 102 of the filter medium 100, so that air can pass through the inner peripheral portion of the lower end surface of the filter medium 100 and be filtered. In this embodiment, the lower end cap 400 functions like a sealing ring, and the lower end cap 400 seals a gap between the filter cartridge and a cartridge housing (not shown).

Referring to fig. 8, the lower cap 400 is installed below the bobbin 20, and the maximum outer diameter of the lower cap 400 is greater than that of the bobbin 20. The lower end cap 400 is most convex in both circumferential and axial directions at the lower end portion of the entire cartridge. Specifically, the lower end cap 400 has a radial flange 401 constituting the largest part of its outer diameter, and the lower end cap 400 also has an axial projection 402 facing axially away from the filter medium 100. The radial flange 401 surrounds the outer periphery of the frame 20, and the axial protrusion 402 protrudes from the end of the frame 20. When the filter cartridge is installed in the cartridge housing (the installed filter cartridge and cartridge housing will be referred to as a cartridge assembly hereinafter), the radial flange 401 is compressively deformed to abut the outer peripheral surface of the filter media 100 (i.e., the radial flange 401 partially surrounds the outer peripheral surface of the filter media 100), and the radial flange 401 seals the radial gap between the filter cartridge and the cartridge housing so that unfiltered air 501 cannot flow out of the cartridge assembly through the gap. While the axial projection 402 seals the axial gap between the cartridge and the cartridge housing, providing a second, secondary barrier to unfiltered air 501.

The lower cap 400 is made of a material having elasticity, and preferably, the material constituting the lower cap 400 includes rubber, particularly Polyurethane (PU). When the lower end cap 400 is mounted to the frame 20, it can be deformed to surround the frame 20; and when the filter cartridge is mounted with the filter cartridge housing, the elastic deformation of the lower end cap 400 enables better sealing between the filter cartridge and the filter cartridge housing.

On the premise of satisfying the sealing property of the gap between the filter element and the filter element housing, the inner diameter of the lower end cap 400 can be set as large as possible to reduce the coverage of the lower end cap 400 on the lower end surface 102, so that the effective filtering area of the lower end surface 102 is increased.

To facilitate shape retention of the filter media 100 and to facilitate mounting of the cartridge components, the frame 20 includes a cylindrical body 201 and an end frame 202 extending radially outward from an end of the body 201. The filter medium 100 is fitted around the outer periphery of the main body 201, and the end frame 202 supports the lower end surface 102 of the filter medium 100. The end frame 202 is folded over at the outer periphery to form a folded edge 203, and the folded direction of the folded edge 203 is directed toward the filter medium 100, thereby facilitating positioning of the filter medium 100.

On the end face of the end bracket 202 facing away from the filter medium 100, an annular flange 204 is provided. The axial length of the flange 204 is less than the axial length of the lower end cap 400. The flange 204 is used to assist in the mounting of the skeletal frame 20 and the lower endcap 400. For example, a groove matching with the flange 204 is provided on the end surface of the lower end cap 400 near the skeleton 20, and the skeleton 20 and the lower end cap 400 are mounted together by fitting the flange 204 into the groove. For another example, the inner diameter of the bottom end cap 400 is set slightly smaller than the outer diameter of the flange 204, and the bottom end cap 400 is fitted around the outer periphery of the flange 204 during installation. The connection between the bottom cap 400 and the frame 20 may be through interference fit or may be through adhesive bonding.

(second embodiment)

With reference to fig. 9 to 12, a cartridge filter according to a second embodiment of the present invention will be described next. The same or similar components as those of the first embodiment are denoted by the same or similar reference numerals, and detailed description thereof is omitted.

This embodiment is a modification of the first embodiment in which the upper end cap 300 covers only the middle hole 103 of the filter medium 100, the upper end face 101 of the filter medium 100 is open to allow air to pass through, and the lower end face 102 is completely covered by the lower end cap 400.

Referring to fig. 10 and 11, unfiltered air 501 can enter the filter element from the upper end surface 101 and the outer peripheral surface of the filter medium 100 and flow out of the filter element from the inner peripheral surface and the lower end surface 102 of the filter medium 100 to be filtered.

This manner of filtration corresponds to the manner of folding and sealing of the filter media 100 with reference to fig. 12. Two flaps 104 adjacent to peripheral fold 1052 form an inner open flap clip. A pair of edges of each inwardly opening flap clip at the upper end face 101 are sealingly connected to form a connecting portion 106.

The above embodiments of the present invention may achieve one or more of the following advantages:

(i) the unfiltered air 501 can flow into the filter element from the outer periphery of the filter medium 100 and flow out of the filter element from the center hole 103 of the filter medium 100, and can also flow into the filter element from the upper end surface 101 of the filter medium 100 or flow out of the filter element from the lower end surface 102 of the filter medium 100. Since at least a portion of one of the upper end face 101 or the lower end face 102 of the filter media 100 is uncovered, the effective filtration area of the filter media 100 is increased.

(ii) In the first embodiment, since air can flow through the inner peripheral portion of the lower end face 102, the output path of the filtered air 502 is not limited to the center hole 103, and therefore the inner diameter of the center hole 103 can be reduced.

One way to reduce the internal diameter of the central opening 103 is to increase the volume of the filter medium 100, for example, the outer diameter of the filter medium 100 is unchanged but the internal diameter is reduced, i.e., the size of each flap 104 in the radial direction is increased, the increase in volume of the filter medium 100 causing the filtration capacity of the filter cartridge to increase.

Another way to reduce the inner diameter of the central bore 103 is to follow the reduction of the outer diameter of the filter medium 100, for example, to reduce the inner diameter and the outer diameter of the filter medium 100 at the same time while the volume of the filter medium 100 remains unchanged, while the filtering capacity of the filter element remains unchanged, but the overall volume is reduced, saving space.

It should be understood that the above embodiments are exemplary only, and are not intended to limit the present invention. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of the present invention without departing from the scope thereof. For example:

(i) the reversal of the flow path of air through the filter medium 100 described in the two embodiments above is also true. For example, in the first embodiment, air may flow into the filter element from the lower end surface 102 and the center hole 103 of the filter medium 100, pass through the filter paper, and flow out of the filter element from the outer peripheral portion of the filter medium 100 to be filtered. With the second embodiment, air may flow into the filter element from the central hole of the filter medium 100, pass through the filter paper, and flow out of the filter element from the outer peripheral portion and the upper end face 101 of the filter medium 100 to be filtered.

(ii) In the above description of the embodiment, the frame 20 and the lower end cap 400 are assembled after being manufactured separately, but the frame 20 and the lower end cap 400 may not be an assembly manufactured separately depending on the manufacturing process. For example, the lower cap 400 is a seal coating layer coated on the surface of the bobbin 20.

(iii) Because the radial flange 401 and the axial protrusion 402 of the lower end cap 400 both function to seal the gap between the filter cartridge and the cartridge housing, the lower end cap 400 may be provided with only one of the radial flange 401 and the axial protrusion 402.

(iv) In the first embodiment, since the outer peripheral portion of the lower end surface 102 of the filter medium 100 is sealed by the lower end cap 400, the connection portion 106 may cover only the inner peripheral portion of the outer opening flap clip for each outer opening flap clip.

(v) The present invention is not limited to the specific shape of the cylindrical main body 201 of the frame 20, and may be in various forms such as a cylindrical form, an elliptic cylindrical form, and a conical form, and accordingly, the filter medium 100 is formed in a shape similar to the main body 201 around the periphery of the main body 201.

(vi) The material of the filter medium 100 is not limited to filter paper, but may be other materials having filtering ability, such as non-woven fabric.

(vii) Although the filter cartridge according to the invention has been described in the embodiments by way of example for an air cleaner of a truck, the filter cartridge according to the invention is not limited to an air cleaner for a truck.

(viii) The filter element assembly according to the present invention is not limited to the filtration of air, and the filter element can also be used for the filtration of other fluids when the filter media 100 is made of a suitable material.

Claims (10)

1. A cartridge type filter element comprising a filter medium (100) having a cylindrical shape, and an upper end cap (300) and a lower end cap (400) provided at both axial ends of the filter medium (100), respectively,

the upper end cap (300) covers at least the middle hole (103) of the filter medium (100) at one axial end of the filter medium (100),

the lower end cap (400) is annular, the lower end cap (400) covers at least a peripheral portion of the lower end face (102) of the filter medium (100),

the filter medium (100) is formed by filter materials through alternately peak folding and valley folding, each folding forms a fold (105), the folds (105) extend along the axial direction of the filter medium (100), a folding sheet (104) is defined between two adjacent folds (105), each two adjacent folding sheets are alternately sealed and connected at the edge of the upper end surface (101) or the lower end surface (102) of the filter medium (100),

at least one of the upper end face (101) and the lower end face (102) has an area at least partially uncovered by the upper end cap (300) or the lower end cap (400) such that fluid can pass axially through the filter element and be filtered.

2. The cartridge filter element of claim 1, wherein the upper end cap (300) further covers the upper end face (101) of the filter media (100) to prevent fluid flow therethrough, the lower end cap (400) uncovering an inner peripheral portion of the lower end face (102) and serving as a seal to separate the lower end face (102) and an outer peripheral surface of the filter media (100);

fluid can flow into the filter element from the outer peripheral portion of the filter medium (100) and flow out of the filter element from the other axial end of the center hole (103) of the filter medium (100) and the inner peripheral portion of the lower end face (102); or

Fluid can flow into the filter element from the other axial end of the center hole (103) of the filter medium (100) and the inner peripheral portion of the lower end surface (102), and can flow out of the filter element from the outer peripheral portion of the filter medium (100).

3. The cartridge filter element of claim 2 wherein two of said flaps (104) associated with an inner circumferential fold (1051) located on an inner circumferential surface of said filter media (100) form an outer open flap clip,

the pair of edges of each outer opening flap clip on the lower end surface (102) are hermetically connected at least at the inner peripheral part of the outer opening flap clip to form a connecting part (106), and the connecting part (106) is connected with the lower end cover (400) in the radial direction.

4. The cartridge filter element of claim 1 wherein at least a portion of the upper end face (101) is uncovered by the upper end cap (300) to allow fluid flow therethrough, the lower end face (102) is completely covered by the lower end cap (400) to prevent fluid flow therethrough,

fluid can flow into the filter element from the outer peripheral portion and the upper end surface (101) of the filter medium (100) and flow out of the filter element from the other axial end of the center hole (103) of the filter medium (100); or

Fluid can flow into the filter element from the other axial end of the center hole (103) of the filter medium (100) and flow out of the filter element from the outer peripheral portion of the filter medium (100) and the upper end surface (101).

5. The cartridge filter element of claim 4, wherein two of the flaps (104) associated with the peripheral fold (1052) at the peripheral surface of the filter media (100) form an inner open flap clip,

a pair of edges of each of the open-ended flap clips at the upper end surface (101) are sealingly connected to form a connecting portion (106).

6. The cartridge filter element of claim 1, wherein the lower end cap (400) has a maximum outer diameter greater than the outer diameter of the lower end face (102) of the filter media (100) and is formed with a radial flange (401) partially surrounding the outer peripheral surface of the filter media (100).

7. The cartridge filter element according to claim 1, further comprising a skeleton (20), said skeleton (20) comprising a main body (201) having a cylindrical shape and an end shelf (202) connected to one axial end of said main body (201), said end shelf (202) extending annularly radially outwards of said main body (201),

the inner circumference of the filter medium (100) is sleeved on the outer circumference of the main body (201), and the lower end surface (102) of the filter medium (100) abuts against the end frame (202).

8. A cartridge filter element according to claim 7, wherein the radially outer end of the end frame (202) has a rim (203) folded axially towards the filter medium (100), the filter medium (100) being radially sandwiched between the main body (201) and the rim (203).

9. The cartridge filter element of claim 7, wherein the end face of the end shelf (202) facing away from the filter media (100) projects away from the filter media (100) to form an annular flange (204), the portion of the end shelf (202) and the flange (204) acting as a support shelf to support the lower end cap (400).

10. The cartridge filter element of claim 9, wherein the lower end cap (400) is a rubber member, and the end shelf (202) and the flange (204) are embedded in the rubber member.

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