Filter Elements and Assemblies

Abstract

The filter element includes a media pack and a seal, the seal is sealingly connected directly or indirectly to the media pack, the filter element includes a longitudinal axis, the seal extends along a closed loop trajectory, the seal defines a predetermined sealing direction relative to the longitudinal axis along the closed loop trajectory, the predetermined sealing direction is not constant along the loop trajectory, and at at least one seal, the sealing direction is not parallel to a side wall, a top wall, or a bottom wall of the filter element or media pack, and the filter assembly includes the filter element.

Description

[Technical field]

[0001] The present disclosure relates to a filter structure for filtering a fluid, such as a liquid or gas, for example air. [Background technology]

[0002] Fluid streams can carry contaminants therein, such as dust and liquid particulates. In many cases, it is desirable to filter some or all of the contaminants from the fluid stream. For example, air streams (e.g., combustion air streams) to engines for automobiles or power plants, gas streams to gas turbine systems, and air streams to various combustion furnaces carry particulate contaminants therein that are to be filtered. In such systems, it is desirable to remove selected contaminants from the air (or reduce their levels in the air). For the removal of contaminants, various fluid filter designs have been developed. Typical fluids to be filtered are gases, such as air, or liquids, such as fuel or oil.

[0003] Fluid filter arrangements typically include a filter housing and a replaceable filter element or filter cartridge operatively disposed therein.

[0004] The air filter element typically includes an inlet face and an outlet face for the inflow of dirty air and the outflow of purified air, respectively, and includes a seal positioned and adapted to be sealed against an inner surface of the filter housing, thereby separating a dirty side containing unfiltered or less filtered air from a clean side containing filtered or more filtered air within the filter housing.

[0005] In many cases, a filter housing will include or preferably include reinforcing, flow guiding, or other structures on the inner wall of the housing that create obstacles to a direct seal arrangement, i.e., such obstacles reduce the design freedom of the filter element, e.g., one or more seals of the filter element.

[0006] Improvement is needed. Summary of the Invention

[0007] The object of the present disclosure is to provide a filter element according to claim 1 and a filter assembly according to the second independent claim.

[0008] In a first aspect of the present disclosure, a filter element is disclosed, comprising a media pack and a seal, preferably for separating filtered and unfiltered areas in a fluid purifier, such as an air purifier, the seal is sealingly connected directly or indirectly to the media pack, the filter element comprising a longitudinal axis, The seal extends along a closed loop trajectory (i.e., defines a single loop or band); the seal defines a predetermined sealing direction relative to a longitudinal line along the closed loop trajectory; The predetermined sealing direction is not constant along the loop trajectory. The seal structure is preferably routed, meaning that a route can be drawn within the seal structure between every two points of the seal structure. Preferably, the seal may comprise a single material or may be a composite seal made of different materials.

[0009] The media pack can be, for example, a grooved media (also called z-type) media pack or a pleated media pack.

[0010] A grooved media pack typically includes a plurality of grooves disposed between the inlet and outlet faces of the media pack, with adjacent grooves alternately closed at the inlet and outlet. Incoming airflow enters an open groove at the inlet face that is closed at the outlet face and is forced through filtration media in the wall separating adjacent grooves. The filtered air then exits the adjacent groove that is closed at the inlet face to the open side at the outlet face.

[0011] A pleated media pack includes a sheet of filtration media that is pleated to increase its filtration surface. It typically defines imaginary inlet and outlet surfaces defined by the peaks and valleys of the pleats. A pleated media pack can also be configured to replace an equivalent grooved media pack, for example, by arranging one or more pleated media sheets in a corresponding volume in an appropriate manner. In such a case, the pleated media pack defines the imaginary inlet and outlet surfaces of the filter element.

[0012] It will be appreciated that for any filter element having a seal, one skilled in the art can determine the (preferential or inherent) sealing orientation of that seal relative to that element. Thus, the sealing orientation can be pre-determined. The sealing orientation can be determined at any position along the closed loop trajectory.

[0013] The sealing direction can be defined or known, for example, by the configuration of the filter element. The sealing direction can be derived at least partially or completely from the relative position of the seal with respect to the media pack, e.g., the inlet and outlet faces of the media pack. The sealing direction can also be derived at least partially or completely by analyzing the presence and orientation of support or reinforcing structures for the seal.

[0014] In an embodiment of the invention, the sealing direction is not constant but is different in at least two seals (longitudinal sections) along the loop trajectory.

[0015] Preferably, at any position along the loop trajectory of the seal, only a single (one) sealing orientation can be defined.

[0016] According to a preferred embodiment, in at least one seal portion, e.g., one of at least two seal portions having different sealing directions, the sealing direction is not parallel to the outer walls of the filter element or media pack, the outer walls including the side walls, top wall and bottom wall of the filter element or media pack.

[0017] According to a preferred embodiment, in at least one seal, for example one of at least two seals having different sealing directions, the sealing direction is not parallel to the sidewall of the filter element or media pack.

[0018] According to a preferred embodiment, in at least one seal portion, e.g., one of at least two seal portions having different sealing directions, the sealing direction is not parallel (preferably not perpendicular) to a corresponding adjacent portion of the side wall of the filter element or filter media pack.

[0019] According to a preferred embodiment, in at least one seal, e.g., in one of at least two seals having different sealing directions, the sealing direction lies in a plane that intersects with the longitudinal axis of the filter element. In another view, any plane that includes or is oriented along the sealing direction intersects with the longitudinal axis of the filter element.

[0020] The above features provide the advantage that greater design flexibility is provided for filter housings and filter assemblies. By embodying the sealing surfaces in the housing and the corresponding sealing surfaces of the filter element as more complex 3D surfaces than exist in the prior art, new filter housings can be conceived that are more compact or can fit more compactly with other engine or vehicle components. This can provide new and alternative filter housings that can provide better performance than existing housings. This can provide alternative filter elements that fit state-of-the-art filter housings. This can allow other housing components to be placed in positions on the filter housing that were not previously possible.

[0021] According to a preferred embodiment, the seal provides a smooth, continuous transition (eg in an intermediate portion) between the respective sealing directions of the first and second portions of said at least two sealing portions.

[0022] According to a preferred embodiment, the sealing direction at the intermediate seal portion between the first and second portions of the seal provides a continuous and preferably smooth transition (e.g. at the intermediate portion) between the respective sealing directions of the first portion (or any first portion) and the second portion (or any second portion) of the (or any) of the at least two seal portions.

[0023] Thus, each of these portions preferably extends over a length of the closed loop trajectory that is 5% longer than the length of the loop trajectory, preferably 10% longer, preferably 20% longer or 25% longer, such that each of these portions preferably extends over a length of the closed loop trajectory that is more than 0.5 cm, preferably more than 1 cm, preferably more than 2 cm or more than 5 cm.

[0024] The sealing direction may be, for example, radially inwardly or outwardly or axially relative to the media pack or, more generally, relative to the longitudinal axis of the filter element or media pack.

[0025] The sealing directions have been described in a manner that includes the directions (e.g., radially inward or outward) as they are assumed to be clear from the context and / or nomenclature of the directions themselves, without individual reference to the directions along each sealing direction (e.g., radially outward or inward).

[0026] In a preferred embodiment of the present disclosure, the predetermined sealing direction is not constant along the loop trajectory and includes a first sealing portion and a different second sealing portion (longitudinal section) along the loop trajectory having a different sealing direction, the sealing direction being selected from the group of an inner radial sealing direction, an outer radial sealing direction and an axial sealing direction.

[0027] The sealing direction can also be varied within one of these three categories, for example, by having a dominant seal component in the first category and a minor component in one of the other categories. For example, a dominant axial seal can include a minor radial component (inner or outer) and be classified as an axial seal. Also, a dominant radial seal (inner or outer) can include a minor axial component and be classified as a radial seal (inner or outer). The sealing direction can be varied, for example, by changing the relative size or relative weight of these components.

[0028] The embodiments of the present disclosure provide flexibility for manufacturing filter elements. For example, the manufacture of filter elements including seals can be accomplished while the filter element itself includes obstacles such as reinforcing ribs, flow guides, handles, etc. Also, filter elements including seals can be designed to successfully seal against the inner walls of a housing that includes physical obstacles such as reinforcing ribs or flow guides. Housings that allow a particular filter element to seal also provide alternative seal patterns for sealing against the inner walls of the housing. That is, alternative filter elements can be developed that seal against alternative sealing surfaces of the inner walls of the housing.

[0029] According to a preferred embodiment, the seal is at least partially or completely about a longitudinal axis of the media pack, which preferably corresponds to a longitudinal axis of the filter element.

[0030] According to a preferred embodiment, the seal is at least partially or completely around the periphery of the media pack.

[0031] According to a preferred embodiment, the filter element further includes a support structure sealingly attached to the media pack, the seal being at least partially (or completely) supported by the support structure.

[0032] According to an alternative preferred embodiment, the media pack itself constitutes a support structure, for example where the media, e.g. the media grooves, are reinforced, e.g. by resin or other means, in locations adjacent the seals.

[0033] According to a preferred embodiment, the predetermined sealing direction is defined as the normal direction of the respective part of the support structure supporting the corresponding seal portion.

[0034] According to a preferred embodiment, the support structure comprises a smooth continuous band surface following the seal. Preferably, the band surface corresponds to the closed loop trajectory of the seal. For each section or portion of the seal, there is a corresponding portion of the band surface supporting it. And the predetermined sealing direction of a portion of the seal is defined as the direction defined by the normal of the corresponding portion of the band surface. For example, the first and second sealing portions of the seal correspond to the first and second portions of the support structure or the smooth continuous band surface.

[0035] According to a preferred embodiment, the band surface comprises a first portion and a different second portion (longitudinal section) along the closed loop trajectory defining first and second normal directions, respectively, the angle between the first normal direction and the axial direction of the filter element being different from the angle between the second normal direction and the axial direction of the filter element.

[0036] Preferably, at any location along the band surface, only a single normal direction can be defined.

[0037] According to a preferred embodiment, at least one band surface includes a normal direction that is not parallel to an outer wall (including a side wall, a top wall, or a bottom wall) of the filter element or media pack.

[0038] According to a preferred embodiment, at least one band surface includes a normal direction that is not parallel to the sidewall of the filter element or media pack.

[0039] According to a preferred embodiment, at least one band surface includes a normal direction that is non-parallel to a corresponding adjacent portion of the sidewall of the filter element or media pack.

[0040] According to a preferred embodiment, at least one band surface includes a normal direction that lies in a plane that intersects the longitudinal axis of the filter element. In another view, any plane that includes or is oriented along the normal direction intersects the longitudinal axis of the filter element.

[0041] According to a preferred embodiment, the normal direction of the support structure makes a continuous and preferably smooth transition (e.g. in the intermediate portion) between the respective normal directions of the band surface portions corresponding to the first seal portion and the second seal portion.

[0042] Thus, each of these band portions preferably extends over the length of the closed loop track, preferably 5% longer than the length of the loop track, preferably 10% longer, preferably 20% longer or 25% longer.

[0043] Hereby, each of these band portions preferably extends over a length of the closed loop track that is greater than 0.5cm, preferably greater than 1cm, preferably greater than 2cm or greater than 5cm.

[0044] According to a preferred embodiment, the filter element comprises a first seal along the loop trajectory, the predetermined sealing direction being radially outward from the longitudinal axis, and a second seal along the loop trajectory, the predetermined sealing direction being axial, i.e. in a direction corresponding to the longitudinal axis.

[0045] According to a preferred embodiment, the filter element comprises a first seal along the loop trajectory, the predetermined sealing direction being radially inward towards the longitudinal axis, and a second seal along the loop trajectory, the predetermined sealing direction being axial, i.e. in a direction corresponding to the longitudinal axis.

[0046] According to a preferred embodiment, the filter element comprises a first seal along the loop path, the predetermined sealing direction being radially outward from the longitudinal axis, and a second seal along the loop path, the predetermined sealing direction being radially inward towards the axial direction.

[0047] A filter element typically has a first and a second axial end, and typically has a side wall connecting the first and second ends. Fluted filter elements are typically wound or manufactured by stacking fluted sheets. Fluted filter elements typically have a circular, elliptical, rectangular or square cross section. Pleated filter elements can be, for example, planar ("panel filters") or essentially tubular. In the latter case, the pleated sheet of filter media is rolled to define a hollow tube. In most cases, a first axial end and a second axial end of the media pack can be defined.

[0048] According to a preferred embodiment, the first seal portion or the first seal portion along the loop trajectory is provided (directly or indirectly) at or on an axial end of the media pack, and the second seal portion or the second seal portion along the loop trajectory is provided (directly or indirectly) at or on a radially outwardly oriented portion of the media pack.

[0049] According to a preferred embodiment, the first seal portion or the first seal portion along the loop trajectory is provided at or on (directly or indirectly) the axial end of the media pack, and the second seal portion or the second seal portion along the loop trajectory is provided at or on (directly or indirectly) the axial end of the media pack.

[0050] According to a preferred embodiment, the first seal portion or the first seal portion along the loop trajectory is provided (directly or indirectly) on or in a radially outwardly oriented portion of the media pack, and the second seal portion or the second seal portion along the loop trajectory is provided (directly or indirectly) on or in a radially outwardly oriented portion of the media pack.

[0051] According to a preferred embodiment, the seal is a polyurethane (PU) seal, for example a foamed PU seal. The predetermined sealing direction of the polyurethane seal is typically a normal direction at its sealing surface. The sealing direction of the first seal part can be different from the sealing direction of the second seal part by having a substantially different angle between the normal direction and the longitudinal axis of the filter element.

[0052] According to a more preferred embodiment, the seal comprises a lip seal. Preferably, the lip seal comprises a thermoplastic elastomer (TPE) or other flexible material suitable for providing a sealing effect. In general, the sealing direction of the lip seal on the filter element corresponds to the direction of a major component selected from a radial component and an axial component of the lip.

[0053] Preferably, the lip seal comprises an elongated base having a front and a back surface, and an elongated flexible lip structure or lip extending from the front surface of the base. Preferably, it comprises a T-shaped cross section. The base is preferably essentially planar and forms an angle with the lip. Preferably, the angle is in the range of 30° to 90°. More preferably, the angle is close to 90°, for example in the range of 75° to 89°. According to a preferred embodiment, the lip forms an inclination angle with respect to the axis of the filter element in a direction towards the inlet face of the filter element or media pack. This "symmetry-breaking" bias of the lip seal ensures that the lip seal moves in the correct direction in use to optimally resist the air pressure differences to which the lip seal is normally exposed. According to a preferred embodiment, the support structure comprises a smooth continuous band surface following the seal, and the base of the lip seal is preferably attached to the band surface. It is preferably in direct or indirect contact with the band surface. Preferably, the base of the lip seal is substantially parallel or parallel to the smooth continuous band surface following it. In such an embodiment, the angle between the lip and the band surface preferably corresponds to the angle between the lip and the base.

[0054] According to a preferred embodiment, the angle between the lip seal and the base is constant along the closed loop trajectory. According to an alternative embodiment, the angle between the lip seal and the base is not constant along the closed loop trajectory.

[0055] According to a preferred embodiment, the lip seal comprises an elongated base having a front surface and a back surface, and a plurality of elongated flexible lip structures or lips disposed on and extending from the front surface of the base. Preferably, the lips of the plurality of lips are disposed in parallel, i.e. parallel adjacent to the base and parallel away from the base. Preferably, the lips of the plurality of lips have the same length, the length being measured radially between the base and the tip of the respective lip. The length of one or more lips is preferably in the range of 1 mm to 15 mm, more preferably in the range of 3 mm to 10 mm. Preferably, the lips of the plurality of lips form the same angle with the base at the same position along the closed loop trajectory. Preferably, the inclination angle between the parallel lips and the base of the lip seal is constant. According to a preferred embodiment, the seal comprises at least two longitudinal portions / sections extending along the closed loop trajectory for more than 0.5 cm or more than 1 cm or more than 2 cm or more than 5 cm, the sealing portions having different sealing directions and comprising an intermediate transition portion or section. According to preferred embodiments, the seal extends along a closed loop trajectory of more than 0.5 cm or more than 1 cm or more than 2 cm or more than 5 cm and comprises 2, 3, 4, 5, 6, 7, 8, 9 or 10 longitudinal portions / sections, including intermediate transition portions or sections.

[0056] The base is preferably applied or injection molded onto the filter element.

[0057] Apart from the filter media pack and the seal, the filter element may include one or two end cap structures and / or shell structures and / or seal support structures. Shells are known to those skilled in the art and may be provided to partially or completely cover and protect the outer surface of the media pack over an axial extent. One or both end cap structures and / or shells are typically sealingly attached to the media pack. One or both end cap structures and / or shells may include a seal support structure. The shell may be integral with at least one end cap. The seal may be applied to or in different portions of the filter element. For example, the seal may be completely applied to one of the end caps of the filter element. Alternatively, the seal may be completely applied to the shell of the filter element. In a preferred embodiment, the seal may be applied to the media pack of the filter element. In a preferred embodiment, the seal may be applied to one of the media pack and end caps of the filter element. In a preferred embodiment, the seal may be applied to the shell and one of the end caps of the filter element.

[0058] Generally, it is preferred that the seal be compressible or flexible so that it can conform to a corresponding sealing surface. Generally, it is preferred that the support or reinforcing structure for the seal be substantially rigid or non-deformable when subjected to forces that arise during handling and installation of the filter element in a corresponding housing. Generally, the support or reinforcing structure for the seal is substantially less deformable and rigid than the seal it supports.

[0059] In preferred embodiments, materials for forming the seal may be selected based on the desired Shore hardness of the resulting seal. In some embodiments, the seal has a Shore A value of at least 25, at least 30, at least 35, at least 40, at least 45, at least 50, at least 55, or at least 60. In some embodiments, the seal has a Shore A value of at most 40, at most 45, at most 50, at most 55, at most 60, at most 65, at most 70, at most 75, at most 80, at most 85, or at most 90. In an exemplary embodiment, the seal has a Shore A value in the range of 30-90. In another exemplary embodiment, the seal has a Shore A value in the range of 40-70. In yet another exemplary embodiment, the seal has a Shore A value in the range of 50-70. In some embodiments, the Shore A value is specified as set forth in ASTM D2240-15e1, entitled "Standard Test Method for Rubber Properties-Durometer Hardness."

[0060] In some embodiments, the seal support or reinforcement structure has a Shore A value of at least 50, at least 60, at least 70, at least 80, or at least 90. In some embodiments, the seal support or reinforcement structure has a Shore A value of at most 80, at most 90, at most 95, or at most 100. In an exemplary embodiment, the seal support or reinforcement structure has a Shore A value in the range of 60-100. In another exemplary embodiment, the seal support or reinforcement structure has a Shore A value in the range of 70-100. In yet another exemplary embodiment, the seal support or reinforcement structure has a Shore A value in the range of 80-100. In some embodiments, the Shore A value is specified as set forth in ASTM D2240-15e1.

[0061] In some embodiments, the seal support or reinforcement structure has a Shore D value of at least 10, at least 15, at least 20, at least 25, or at least 30. In some embodiments, the seal support or reinforcement structure has a Shore D value of at most 80, at most 90, at most 95, or at most 100. In an exemplary embodiment, the seal support or reinforcement structure has a Shore D value in the range of 15 to 100. In another exemplary embodiment, the seal support or reinforcement structure has a Shore D value in the range of 30 to 100. In some embodiments, the Shore D value of the seal support or reinforcement structure is specified as set forth in ASTM D2240-15e1.

[0062] In a second aspect of the present disclosure, a filter assembly is disclosed that includes a housing and a filter element according to any of the embodiments of the first aspect operably retained within the housing, the housing including a predetermined sealing surface for receiving a seal along a closed loop trajectory, the sealing surface being complementary to the seal having a non-constant predetermined sealing orientation.

[0063] According to a preferred embodiment, the distance between a predetermined sealing surface of the housing for receiving the seal along the closed loop trajectory and a smooth, continuous band surface of the support structure following the seal is maintained constant along the closed loop trajectory, which provides the advantage that the seal will exhibit the same amount of compression (in the case of polyurethane seals) or the same or approximately the same directional and directional deflection (in the case of lip seals) along the closed loop trajectory, providing a stronger sealing connection between the seal and the housing wall.

[0064] The predetermined sealing surface is preferably capable of cooperating with a seal to separate clean and dirty air regions within the housing.

[0065] According to a preferred embodiment, the housing includes an internal sealing surface that forms a continuous closed loop track (ie, defining a single loop or band).

[0066] Features and advantages disclosed in one of the above aspects of the disclosure are implicitly disclosed herein for other aspects, mutatis mutandis, as will be appreciated by those skilled in the art. [Brief description of the drawings]

[0067] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate several aspects of the present disclosure. A brief description of the drawings is as follows: [Figure 1] FIG. 1 is a perspective view of a first embodiment of the present disclosure. [Diagram 2] FIG. 2 is a perspective view of a second embodiment of the present disclosure. [Diagram 3] FIG. 3 is a perspective view of a third embodiment of the present disclosure. [Figure 4(a)] FIG. 4(a) is a perspective view of a fourth embodiment of the present disclosure. [Figure 4(b)] FIG. 4(b) is a perspective view of the fifth embodiment of the present disclosure. [Figure 4(c)] FIG. 4(c) is a perspective view of a sixth embodiment of the present disclosure. [Figure 4(d)] FIG. 4(d) is a perspective view of the seventh embodiment of the present disclosure. [Diagram 5] FIG. 5 shows a detail of the embodiment of FIG. 4(a). [Figure 6] FIG. 6 shows a detail of the embodiment of FIG. 4(b). [Figure 7] FIG. 7 shows a detail of the embodiment of FIG. 4(c). [Figure 8] FIG. 8 shows a detail of the embodiment of FIG. 4(d). [Figure 9(a)] FIG. 9(a) shows details of a preferred seal arrangement of a preferred embodiment of the present disclosure. [Figure 9(b)] FIG. 9(b) shows details of a preferred seal arrangement of a preferred embodiment of the present disclosure. [Figure 9(c)] FIG. 9(c) shows details of a preferred seal arrangement of a preferred embodiment of the present disclosure. [Figure 10(a)]FIG. 10(a) illustrates the position of a filter element according to a third preferred embodiment of the present disclosure in an associated filter housing. [Figure 10(b)] FIG. 10(b) illustrates the location of a filter element according to a third preferred embodiment of the present disclosure in an associated filter housing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0068] The present disclosure will be described with respect to certain embodiments and with reference to certain drawings, but the disclosure is not limited thereto, but only by the claims. The drawings described are only schematic and are non-limiting. In the drawings, the size of some elements may be exaggerated and are not drawn to scale for illustrative purposes. The dimensions and relative dimensions do not necessarily correspond to actual reductions of the present disclosure.

[0069] Moreover, the terms first, second, third, etc. in this specification and claims are used to distinguish between similar elements and are not necessarily used to describe a sequential or chronological order.

[0070] Although various embodiments are referred to as "preferred," they should not be construed as limiting the scope of the disclosure, but rather as examples in which the disclosure may be practiced.

[0071] FIG. 1 shows a first preferred embodiment of the present disclosure. The filter element 1 includes a grooved media or z-shaped media pack 2. The media pack is wound and includes a round cross section perpendicular to its longitudinal axis. The longitudinal axis of the filter element 1 and the longitudinal axis of the media pack 2 are coincident. The media packs / filter elements are located on either side of the media pack 2 and have inlet and outlet faces 20 and 21 that are parallel to each other. At the inlet face, the filter element includes a support structure 4 sealingly connected to the media pack 2. The support structure is embodied as a media support and seal support frame attached to an end of the media pack 2, e.g. the outlet end. The support structure includes an axially oriented circumferential outer surface and a radially oriented outer surface. The seal 3 is provided on the support structure 4 along a closed loop orbit. The seal is circumferential with respect to the longitudinal axis x of the media pack. The seal 3 is routed. The seal 3 defines a predetermined sealing direction with respect to the longitudinal axis x along the closed loop orbit that is not constant along the closed loop orbit. In the first seal section (longitudinal section) 31 along the loop trajectory, the sealing direction of the seal 3 is axial. In the second seal section (longitudinal section) 30 along the loop trajectory, the sealing direction of the seal 3 is radial. Between the first and second seal sections, the seal transitions smoothly and continuously between the respective sealing directions. Each of these sections therefore preferably extends over the length of the closed loop trajectory by more than 5% of the length of the loop trajectory.

[0072] Both portions have a length along the closed loop trajectory greater than 0.5 cm, preferably greater than 5 cm.

[0073] A first seal 31 along the loop trajectory is provided at the axial end of the media pack 2 , i.e. on the axially oriented outer circumferential surface of the support structure 4 .

[0074] The second seal 30 along the loop trajectory is provided in a radially outwardly oriented portion, i.e., on the radially oriented outer surface, of the media pack 2. The transition between the first portion 31 and the second portion 30 is also provided in the support structure 4.

[0075] The seal 3 is a lip seal, the embodiment of which is shown in Figures 9(a) to 9(c). The lip seal 3 includes an elongated base 33 having a front and a back surface, and an elongated flexible lip structure or lip 34 extending from the front surface of the base 33. It includes a T-shaped cross section. The base is essentially planar and forms an angle α with the lip 34. The angle α is preferably within the range of 45° to 90°. The support structure 4 includes a smooth continuous band surface 40 following the seal 3, and the base 33 of the lip seal 3 is sealingly attached to the band surface 40. It is in direct contact with the band surface. The base 33 of the lip seal 3 is parallel to the smooth continuous band surface following it. The angle between the lip 34 and the band surface 40 corresponds to the angle α between the lip 34 and the base 33, the latter being substantially constant or constant. The sealing directions of the seals 30 and 31 are defined parallel to the normal direction on the respective support surfaces corresponding to the respective sections or portions of the smooth continuous band surface 40 of the support structure 4. The sealing directions are different in the sense that the respective angles between the sealing directions and the axis x of the filter element are different (see also, for example, FIG. 9(c)).

[0076] 2 shows a second preferred embodiment of the present disclosure, the top of the figure is a perspective view, and the bottom is a side view of a cut-out section near the bend of the support structure / end cap 4 of the filter element.

[0077] The filter element 1 includes a pleated media pack 2. The pleated media sheets are tubularly arranged around a central opening 22 and define a longitudinal axis. The longitudinal axes of the filter element 1 and the media pack 2 are coincident. The media pack / filter element has an inflow face 20. An opposite side of the media pack 2 is provided with a closed end cap structure 5. In use, airflow enters the interior space 20 through the inflow face 20, is filtered by the media pack 2 which defines the sidewalls of the filter element 1, and leaves the filter element 1 primarily in a radial direction.

[0078] At the inlet face, the filter element includes a support structure 4 (open end cap) sealingly connected to the media pack 2. The support structure is embodied as a media support and seal support frame attached to an end of the media pack 2, for example the inlet end. The support structure 4 includes an axially oriented outer peripheral surface and a radially oriented outer surface. The seal 3 is provided on the support structure 4 along a closed loop trajectory. The seal is circumferential with respect to the longitudinal axis x of the media pack 2. The seal 3 is routed. The seal 3 defines a predetermined sealing direction with respect to the longitudinal axis x along the closed loop trajectory, which is not constant along the loop trajectory. At the first seal section (longitudinal section) 31 along the loop trajectory, the sealing direction of the seal 3 is axial. At the second seal section (longitudinal section) 30 along the loop trajectory, the sealing direction of the seal 3 is radial. Between the first seal section and the second seal section, the seal transitions smoothly and continuously between the respective sealing directions. Thereby, each of these seal sections preferably extends over a length of the closed loop trajectory that is longer than 5% of the length of the loop trajectory. Both portions have a length along the closed loop trajectory greater than 0.5 cm, more preferably greater than 5 cm.

[0079] The first seal 31 along the loop trajectory is provided at the axial end of the media pack 2 , i.e. at the axially oriented outer circumferential surface of the support structure 4 .

[0080] The second seal 30 along the loop trajectory is provided on a radially outwardly directed portion, i.e., on the radially oriented outer surface, of the media pack 2. The transition between the first portion 31 and the second portion 30 is also provided on the support structure 4.

[0081] In axial projection, the seal overlaps with the media pack for most of the closed loop orbit, including seal portion 31. In a smaller portion, including seal portion 30, the axial projections of the seal and media pack do not overlap.

[0082] The seal 3 is a lip seal similar to that described for the first embodiment in relation to Figures 9(a)-9(c). The lip seal 3 comprises an elongated base 33 having a front and a back surface, and an elongated flexible lip structure or lip 34 extending from the front surface of the base 33. It comprises a T-shaped cross section. The base is essentially planar and forms an angle α with the lip 34. The angle is preferably in the range of 45°-90°. The support structure 4 has a smooth continuous band surface following the seal 3, and the base 33 of the lip seal 3 is attached to seal against the band surface. It is in direct contact with the band surface. The base 33 of the lip seal 3 is parallel to the smooth continuous band surface following it. The angle between the lip 34 and the band surface corresponds to the angle α between the lip 34 and the base 33, the latter being substantially constant or constant. The sealing directions of the seals 30 and 31 are defined parallel to the normal direction on the respective support surfaces corresponding to respective sections or portions of the smooth continuous band surface of the support structure 4. The sealing directions are different in the sense that the respective angles between the sealing directions and the axis x of the filter element 2 are different.

[0083] FIG. 3 illustrates a third preferred embodiment of the present disclosure.

[0084] The filter element 1 includes a pleated panel type media pack 2. The pleated media sheet 2 is sealed or hermetically embedded within a surrounding media and seal support frame 4. The seal support frame may include, for example, stiffening ribs 42 for the frame and / or media.

[0085] The filter element defines a central axis perpendicular to the filter frame / media pack. The axis of the filter element 1 and the axis of the media pack 2 are coincident. The media pack / filter element has parallel, opposed inlet and outlet flow faces 20, 21.

[0086] The support structure or frame 4 includes an axially oriented circumferential surface and a radially oriented outer surface corresponding to the axial and radial surfaces of the media pack, respectively. The radially oriented surface of the frame 4 is provided with tabs / projections 43 suitable for acting as positioning means or pivot points for the filter element 1 by appropriate interaction with the housing. The support structure 4 is provided with seals 3 along a closed loop track. The seals are circumferential with respect to the longitudinal axis x of the media pack 2. The seals 3 are routed. The seals 3 define a predetermined sealing direction with respect to the longitudinal axis x along the closed loop track, which sealing direction is not constant along the closed loop track. In the first seal section (longitudinal section) 31 along the loop track, the sealing direction of the seal 3 is axial. In the second seal section (longitudinal section) 30 along the loop track, the sealing direction of the seal 3 is radial. Between the first seal section and the second seal section, the seals transition smoothly and continuously between the respective sealing directions. Thus, each of these sections preferably extends over the length of the closed loop track 5% longer than the length of the loop track. The length of both sections along the closed loop trajectory is greater than 0.5cm, more preferably greater than 5cm.

[0087] A first seal 31 along the loop trajectory is provided at the axial end of the media pack 2 , i.e. on the axially oriented outer circumferential surface of the support structure 4 .

[0088] The second seal 30 along the loop trajectory is provided on a radially outwardly oriented portion, i.e. on the radially oriented outer surface, of the media pack 2. The transition between the first portion 31 and the second portion 30 is also provided on the support structure 4.

[0089] In axial projection, the seal does not overlap the media pack for most of the closed loop orbit, except near the pivot structure 43 .

[0090] Advantageously, the seal 3 can be applied to the filter element near, but not at, the tabs / protrusions 43 of the frame 4 and still effectively seal against the inner wall of the respective filter housing.

[0091] The seal 3 is a lip seal similar to that described for the first embodiment in relation to Figures 9(a)-(c). The lip seal 3 comprises an elongated base 33 having a front and a back surface, and an elongated flexible lip structure or lip 34 extending from the front surface of the base 33. It comprises a T-shaped cross section. The base is essentially planar and forms an angle α with the lip 34. The angle is preferably in the range of 45° to 90°. The support structure 4 comprises a smooth continuous band surface following the seal 3, the base 33 of the lip seal 3 sealingly attached to the band surface. It is in direct contact with the band surface. The base 33 of the lip seal 3 is parallel to the smooth continuous band surface following it. The angle between the lip 34 and the band surface corresponds to the angle α between the lip 34 and the base 33, the latter being substantially constant or constant. The sealing directions of the seals 30 and 31 are defined as being parallel to the normal directions on the respective support surfaces corresponding to the respective sections or portions of the smooth continuous band surface 40 of the support structure 4. The sealing directions are different in the sense that the respective angles between the sealing directions and the axis x of the filter element 2 are different.

[0092] 10(a) and 10(b) show the interaction of a filter element according to the third preferred embodiment with a corresponding filter housing 100. FIG. 10(a) is a cutaway perspective view of the housing 100 with a perspective view of the filter element 1 during installation. FIG. 10(b) is a cutaway perspective view of both the filter element 1 and the housing 100 in the final installed state of the filter element 1. The filter housing 100 is of the side-loading type and is adapted to receive both the safety filter element and the main filter element. It includes an access opening and a cover (not shown) for closing the access opening. The safety filter element corresponds to the filter element of the third preferred embodiment. The housing has an inlet 102 and an outlet 103, typically located at both ends of the filter housing 100. The filter housing optionally includes a precleaner arrangement 101 arranged upstream of the inlet 102, which is known in the art and typically includes a set of swirl generating means and associated dust separation tubes 1011. The side wall of the housing includes recesses 1043 positioned and adapted to receive the tabs / projections 43 of the frame 4 so that the filter element 1 can pivot about the tabs 43 in the recesses 1043 to a final position near the outlet 103, whereby the circumferential seal 3 seals the filter element 1 against the inner wall of the housing 100. The presence of an axial seal on the top surface of the filter element 1 and a transition above that towards a radial seal allows for compact placement of the filter assembly (100,1) as the position of the seal in the final position is not compromised by the pivoting action or presence of the tabs 43.

[0093] Figures 4(a)-4(d) show fourth, fifth, sixth and seventh embodiments of the present disclosure including first and second seal portions with different sealing directions, the details of which are shown in Figures 5-8, respectively. In each of these embodiments, between the first and second seal portions, the seal (or sealing direction) is a smooth and continuous transition between the respective sealing directions of the first and second seal portions.

[0094] More generally, in all embodiments of the present disclosure, it is advantageous to provide a seal on the filter element for mounting a given housing while somehow "bypassing" pivot structures, reinforcing ribs, flow guides, or any other obstructions present on the filter element or on an associated filter housing.

[0095] 4(a) and 5 show a fourth preferred embodiment of the present disclosure. The filter element 1 includes a grooved media or z-type media pack 2. The media pack is wound and includes a circular cross section perpendicular to its longitudinal axis. It includes a closed central core 22. The longitudinal axes of the filter element 1 and the media pack 2 are coincident.

[0096] The media pack / filter element is located on either side of the media pack 2 and has parallel inlet and outlet faces 20, 21. At the inlet face, the filter element includes an end cap that serves as a support structure 4 sealingly connected to the media pack 2. The support structure 4 is embodied as an open media support and seal support frame that is attached to an end of the media pack 2, e.g., the outlet end.

[0097] The support structure 4 includes a collar 44 in the form of a hollow tube extending axially away from the filter element.

[0098] The collar includes an axial step. At a first radial position of the collar, the collar extends axially further from the inlet face 20 of the filter element 1 than at a second, opposite radial position. The collar includes a portion 441 that is parallel to the axis of the filter element at the first radial position. The collar includes a chamfer 442 that is angled relative to the axis of the filter element at the second radial position.

[0099] The seal 3 is mounted to the collar structure 44 along a closed loop trajectory that includes a first radial position and a second radial position of the collar. The seal is circumferential about a longitudinal axis of the media pack. The seal 3 is routed. The seal 3 defines a predetermined sealing direction along the closed loop trajectory that is not constant along the loop trajectory relative to the longitudinal axis x.

[0100] In the first seal section (longitudinal section) 31 along the loop trajectory, corresponding to the chamfered collar section 442, the sealing direction of the seal 3 is at 45° to both the radial and axial directions.

[0101] In the second seal section (longitudinal section) 30 along the loop track corresponding to the collar section 441, the sealing direction of the seal 3 is in the radially outward direction. Between the first and second seal sections, the seal makes a smooth and continuous transition between the respective sealing directions on the collar section 44. Thus, each of these seal sections preferably extends over the length of the closed loop track 5% longer than the length of the closed loop track. The length of both sections along the closed loop track is more than 0.5 cm, more preferably more than 5 cm.

[0102] Both the first seal 30 and the second seal 31 are provided at the axial ends of the media pack 2 .

[0103] The seal 3 is a lip seal, the embodiment of which is shown in Figures 9(a)-9(c). The lip seal 3 includes an elongated base 33 having a front and a back surface, and an elongated flexible lip structure or lip 34 extending from the front surface of the base 33. It includes a T-shaped cross section. The base is essentially planar and forms an angle α with the lip 34. The angle α is preferably in the range of 45°-90°. The support structure 4 includes a smooth continuous band surface 40 following the seal 3, and the base 33 of the lip seal 3 is sealingly attached to the band surface 40. It is in direct contact with the band surface 40. The base 33 of the lip seal 3 is parallel to the smooth continuous band surface 40 following it. The angle between the lip 34 and the band surface 40 corresponds to the angle α between the lip 34 and the base 33, the latter being substantially constant or constant. The sealing directions of the seals 30 and 31 are defined as being parallel to the normal direction on the respective support surfaces corresponding to respective sections or portions of the smooth continuous band surface 40 of the support structure 4. The sealing directions are different in the sense that the respective angles between the sealing directions and the axis x of the filter element are different.

[0104] In the axial projection, the seal 3 completely overlaps with the media pack 2, i.e. the axial projection of the seal 3 lies within the axial projection of the media pack 2.

[0105] 4(b) and 6 show a fifth preferred embodiment of the present disclosure. The filter element 1 comprises a grooved media or z-type media pack 2. The media pack is wound and comprises a circular cross section perpendicular to its longitudinal axis. It comprises a closed central core 22. The longitudinal axes of the filter element 1 and the media pack 2 are coincident.

[0106] The media pack / filter element is located on either side of the media pack 2 and has parallel inlet and outlet faces 20, 21. At the inlet face, the filter element includes an end cap that serves as a support structure 4 sealingly connected to the media pack 2. The support structure 4 is embodied as an open media support and seal support frame that is attached to an end of the media pack 2, e.g., the outlet end.

[0107] The support structure 4 includes a cylindrical shell that covers the sidewall of the media pack adjacent to and abutting the inlet flow face 20. The shell has a limited axial extent, but alternatively can cover the entire sidewall of the media pack 2 to which it is sealingly attached. The support structure 4 further includes a radially extending flange that abuts the inlet flow face 20, the flange having a flat surface perpendicular to the axial direction and meeting the inlet flow face 20. The flange can extend radially over an angular area of, for example, about 180°. Opposite the flange, the support structure includes a chamfered surface that extends at an oblique angle away from the cylindrical base of the shell over a complementary angular area. There is an axial step between the flange and the chamfered surface. A smooth transition structure is provided between the flange and the chamfered structure on the cylindrical base of the shell to define a smooth, continuous circumferential band surface 40 for the support structure 4.

[0108] The seal 3 is sealingly attached to the band surface 40 along a closed loop trajectory. The seal 3 is routed. Along the closed loop trajectory, the seal 3 defines a predetermined sealing direction relative to the longitudinal axis x, which is not constant along the loop trajectory.

[0109] In the first sealing portion (longitudinal section) 31 along the loop track located on the flange, the sealing direction of the seal 3 is axial.

[0110] In the second seal portion (longitudinal section) 30 along the loop trajectory located on the chamfered surface, the sealing direction of the seal 3 is in the normal direction on the chamfered surface, which is mainly radial, not purely axial.

[0111] Thus, each of these portions preferably extends over a length of the closed loop track that is 5% longer than the length of the closed loop track, and the length of both seals along the closed loop track is greater than 0.5 cm, more preferably greater than 5 cm.

[0112] The seal 3 is a lip seal, the configuration of which is shown in Figures 9(a)-9(c) and is identical to that described for the previous preferred embodiment. The sealing directions of the seals 30 and 31 are defined as being parallel to the normal direction on their respective support surfaces, corresponding to respective sections or portions of the smooth continuous band surface 40 of the support structure 4. The sealing directions are different in the sense that the respective angles between the sealing direction and the axis x of the filter element are different.

[0113] In the axial projection, the seal 3 does not overlap with the media pack 2, i.e. the axial projection of the seal 3 and the axial projection of the media pack 2.

[0114] FIG. 4(c) and FIG. 7 show a sixth preferred embodiment of the present disclosure.

[0115] The filter element 1 includes a pleated media pack 2. The pleated media sheets are tubularly arranged around a central opening 22 and define a longitudinal axis. The longitudinal axes of the filter element 1 and the media pack 2 are coincident. The media pack / filter element has an inflow face 20. An opposite side of the media pack 2 is provided with a closed end cap structure 5. In use, airflow enters the interior space 20 through the inflow face 20, is filtered by the media pack 2 which defines the sidewalls of the filter element 1, and leaves the filter element 1 primarily in a radial direction.

[0116] At the inlet flow face 20, the filter element includes a support structure 4 (or open end cap) sealingly connected to the media pack 2. The support structure is embodied as a media support and seal support frame sealingly attached to an end, e.g., the inlet flow end, of the media pack 2.

[0117] The end caps 4 include an axial ring structure parallel to the associated axial end face of the media pack and an inner cylindrical rim adjacent the inner wall of the media pack 2, extending axially from the inner boundary of the ring structure, e.g., at least 0.5 cm, at least 1 cm, or at least 3 cm, toward the filter media. The end caps are sealingly attached to the end faces of the media pack.

[0118] The seals 3 are provided on the support structure 4 along a closed loop track. The seals are circumferential with respect to the longitudinal axis x of the media pack 2. The seals 3 are routed. The seals 3 define a predetermined sealing direction with respect to the longitudinal axis x along the closed loop track, which sealing direction is not constant along the closed loop track. In a first seal part (longitudinal section) 31 along the loop track, arranged on the outside of the axial ring structure, the sealing direction of the seal 3 is axial. In a second seal part (longitudinal section) 30 along the loop track, arranged on the inside of the inner cylindrical rim, the sealing direction of the seal 3 is inwardly radial. Between the first seal part and the second seal part, the seal transitions smoothly and continuously between the respective sealing directions. The length of both parts along the closed loop track is more than 0.5 cm, more preferably more than 5 cm. Thus, it is preferred that each of these seal parts extends over the length of the closed loop track 5% longer than the length of the loop track.

[0119] A first seal 31 along the loop trajectory is provided at an axial end of the media pack 2 .

[0120] The second seal 32 along the loop trajectory is provided on the radially inwardly oriented part of the media pack 2, i.e. on the inner cylindrical rim. The transition between the first seal 31 and the second seal 32 is also provided on the support structure 4.

[0121] The seal 3 is a lip seal similar to that described for the first embodiment in relation to Figures 9(a)-9(c) and identical to that described for the previous preferred embodiment. The sealing directions of the seals 30 and 31 are defined parallel to the normal on the respective support surfaces corresponding to respective sections or portions of the smooth continuous band surface of the support structure 4. The sealing directions are different in the sense that the respective angles between the sealing directions and the axis x of the filter element are different.

[0122] FIG. 4(d) and FIG. 8 show a seventh preferred embodiment of the present disclosure.

[0123] The seventh preferred embodiment is similar to the sixth preferred embodiment, except that the end cap 4 includes an axial ring structure parallel to the associated axial end face of the media pack 2, and inner and outer cylindrical rims adjacent the inner and outer walls of the media pack 2, respectively, that extend axially from the inner and outer boundaries of the ring structure, respectively, toward the filter media. For example, the end cap can define a cylindrical volume for receiving an end of a pleated tubular media pack 2, e.g., a potting material for sealingly attaching the media to the end cap 4. This embodiment includes first, second and third seal portions (longitudinal sections) with different sealing directions along a closed loop trajectory. It also includes a first seal portion 32 with a radially inward sealing direction and a second seal portion 30 with a radially outward sealing direction.

[0124] The seals 3 are provided on the support structure 4 along a closed loop track. The seals are circumferential with respect to the longitudinal axis x of the media pack 2. The seals 3 are routed. The seals 3 define a predetermined sealing direction with respect to the longitudinal axis x along the closed loop track, which sealing direction is not constant along the closed loop track. In a first seal section (longitudinal section) 31 along the loop track, arranged on the outside of the axial ring structure, the sealing direction of the seal 3 is axial. In a second seal section (longitudinal section) 30 along the loop track, arranged on the inside of the inner cylindrical rim, the sealing direction of the seal 3 is radially inward. In a third seal section (longitudinal section) 30 along the loop track, arranged on the outside of the outer cylindrical rim, the sealing direction of the seal 3 is radially outward. The length along the closed loop track of at least two or all three sections is more than 0.5 cm, more preferably more than 5 cm. Thus, it is preferred that each of these seal sections extends over the length of the closed loop track 5% longer than the length of the loop track.

[0125] Between the first seal portion 31, the second seal portion 32 and the third seal portion 30, the seal 3 provides a smooth and continuous transition between the respective sealing directions by means of respective transition portions.

[0126] A first seal 31 along the loop trajectory is provided at an axial end of the media pack 2 .

[0127] A second seal 32 along the loop track is provided on the radially inner portion of the media pack 2, i.e. on the inner cylindrical rim.

[0128] A transition portion is also provided in the support structure 4. A third seal portion 30 along the loop path is provided in the radially outwardly oriented portion of the media pack 2, i.e. in the outer cylindrical rim.

[0129] The seal 3 is a lip seal, similar to that described for the first embodiment in relation to Figures 9(a)-9(c) and identical to that described for the previous preferred embodiment. The sealing directions of the seals 30, 31 and 32 are defined as parallel to the normal on their respective support surfaces, corresponding to respective sections or portions of the smooth continuous band surface 40 of the support structure 4. The sealing directions are different in the sense that the respective angles between the sealing direction and the axis x of the filter element are different.

[0130] FIG. 9(a) shows features of a lip seal 3 that can be used in any of the preferred embodiments of the present disclosure. The lip seal 3 includes an elongated base 33 having a front and a back surface, and an elongated flexible lip structure or lip 34 extending from the front surface of the base 33. It includes a generally T-shaped cross section. The base is essentially planar and forms an angle α with the lip 34. The angle α is preferably in the range of 45° to 90°. The support structure 4 includes a smooth continuous band surface 40 that continues into the seal 3, and the base 33 of the lip seal 3 is sealingly attached to the band surface 40. It is in direct contact with the band surface. The base 33 of the lip seal 3 is parallel to the smooth continuous band surface that continues into it. FIG. 9(b) shows features of a similar lip seal 3 that can be used in any of the preferred embodiments of the present disclosure, including two parallel lips 34 extending from the base 33. Alternatively, more parallel lips 34 can be provided, for example three, four or more lips 34.

[0131] Figure 9(c) shows a cross section of a seal 3 extending along a closed loop trajectory with two parts with different sealing directions, where the sealing directions are defined by the directions of the normals of the corresponding supports. The two normal vectors make different angles with the axis x of the filter element.

[0132] In accordance with this disclosure, for all of the disclosed embodiments, a person skilled in the art will understand that in at least one seal, e.g., one of at least two seals with different sealing directions, the sealing direction is not parallel to an outer wall of the filter element or media pack, each outer wall including a side wall, top wall, or bottom wall of the filter element or media pack. For example, in at least one seal, the sealing direction is not parallel to a side wall of the filter element or media pack.

[0133] In accordance with this disclosure, for all of the disclosed embodiments, a person skilled in the art will also understand that in at least one seal, the sealing direction is not parallel (and preferably not perpendicular) to the corresponding adjacent portion of the sidewall of the filter element or filter media pack.

[0134] According to the present disclosure, for all of the disclosed embodiments, a person skilled in the art will also understand that in at least one seal, the sealing direction is in a plane that intersects the longitudinal axis of the filter element. In another view, any plane that includes or is oriented along the sealing direction intersects the longitudinal axis of the filter element. This application is intended to cover any adaptations or variations of the present subject matter. It should be understood that the above description is illustrative and not limiting.

[0135] For example, the following may be claimed:

[0136] 1) A filter element (1) including a media pack (2) and a seal (3), the seal (3) being directly or indirectly connected to the media pack (2) in a sealing manner, the filter element (1) including a longitudinal axis; The seal (3) extends along a closed loop trajectory, the seal (3) defines a predetermined sealing direction relative to the longitudinal axis along the closed loop trajectory; The filter element, wherein the predetermined sealing direction is not constant along the loop path.

[0137] 2) The filter element according to item 1, wherein the seal (3) is a path-connected structure.

[0138] 3) The filter element of any of the preceding items, wherein the seal (3) is at least partially circumferential to a longitudinal axis of the media pack (2).

[0139] 4) The filter element according to any of the preceding items, wherein the seal (3) is at least partially around the periphery of the media pack (3).

[0140] 5) The filter element of any of the preceding items, further comprising a support structure (4) sealingly attached to the media pack (2), the seal (3) being at least partially (or completely) supported by the support structure (4).

[0141] 6) The filter element according to item 5, wherein the predetermined sealing direction is defined as a normal direction of each portion of the support structure that supports the corresponding seal portion.

[0142] 7) The filter element of item 5 or 6, wherein the support structure includes a smooth continuous band surface that continues into the seal, the band surface preferably corresponding to the closed loop trajectory of the seal such that for each section or portion of the seal there is a corresponding portion of the band surface supporting it.

[0143] 8) The filter element according to item 7, wherein the band surface includes a first portion and a second portion (longitudinal section) different from the first portion defining a first normal direction and a second normal direction, respectively, along the closed loop trajectory, and an angle between the first normal direction and an axial direction of the filter element is different from an angle between the second normal direction and the axial direction of the filter element.

[0144] 9) The filter element according to item 8, wherein each of the band portions preferably extends over the length of the closed loop orbit 5% longer than the length of the loop orbit, preferably 10% longer, preferably 20% longer or 25% longer.

[0145] 10) A filter element according to any of the preceding items, comprising a first seal portion (30) along the loop path, the predetermined sealing direction being radially outward from the longitudinal axis, and a second seal portion (31) along the loop path, the predetermined sealing direction being axial, i.e. in the direction corresponding to the longitudinal axis.

[0146] 11) A filter element according to any of the preceding items, comprising a first seal portion (32) along the loop path, the predetermined sealing direction being radially inward towards the longitudinal axis, and a second seal portion (31) along the loop path, the predetermined sealing direction being axial, i.e. in the direction corresponding to the longitudinal axis.

[0147] 12) A filter element according to any of the preceding items, comprising a first seal portion (30) along the loop path, the predetermined sealing direction being radially outward from the longitudinal axis, and a second seal portion (31) along the loop path, the predetermined sealing direction being radially inward towards the longitudinal axis.

[0148] 13) A filter element according to any of the preceding items, wherein a first seal portion or the first seal portion (30, 31, 32) along the loop trajectory is provided at an axial end of the media pack (2) and a second seal portion or the second seal portion (30, 31, 32) along the loop trajectory is provided in a radially outwardly oriented portion of the media pack.

[0149] 14) A filter element according to any of the preceding items, wherein a first seal portion or the first seal portion (30, 31, 32) along the loop trajectory is provided at an axial end of the media pack (2), and a second seal portion or the second seal portion (30, 31, 32) along the loop trajectory is provided at an axial end of the media pack (2).

[0150] 15) A filter element according to any of the preceding items, wherein a first seal portion or the first seal portion (30, 31, 32) along the loop path is provided in a radially outwardly oriented portion of the media pack (2) and a second seal portion or the second seal portion of the loop path is provided in a radially outwardly oriented portion of the media pack.

[0151] 16) The filter element according to any of the preceding items, wherein the first seal portion or the first seal portion and the second seal portion or the second seal portion (3) extend over a length of the closed loop orbit that is 5% longer than the length of the closed loop orbit.

[0152] 17) The filter element of any of the preceding items, wherein the seal (3) comprises a lip seal including a base and one or more lips (3) extending from the base.

[0153] 18) The filter element of item 17, wherein the lip seal includes a plurality of longitudinal lips arranged in parallel.

[0154] 19) The filter element according to item 17 or 18, wherein the lip is disposed at an inclination angle relative to the base portion, the inclination angle being preferably constant.

[0155] 20) A filter assembly comprising a housing (100) and a filter element (1) according to any of the preceding items held within the housing (100), wherein the housing (100) includes a predetermined sealing surface for receiving the seal (3) along the closed loop trajectory, the sealing surface being complementary to the seal (3) having a non-constant predetermined sealing direction.

[0156] 21) The filter assembly of item 20, wherein a distance between a predetermined sealing surface of the housing for receiving the seal along the closed loop trajectory and a smooth, continuous band surface of the support structure following the seal is maintained constant along the closed loop trajectory.

Claims

1. A filter element (1) comprising a media pack (2) and a seal (3), wherein the seal (3) is sealed and directly or indirectly connected to the media pack (2), and the filter element (1) includes a longitudinal axis. The seal (3) extends along the closed-loop track, The seal (3) defines a predetermined sealing direction with respect to the longitudinal axis along the closed-loop trajectory, The predetermined sealing direction is not constant along the loop trajectory, The filter element (1) includes a first sealing portion (32) along the closed-loop trajectory, wherein the predetermined sealing direction is radially inward toward the longitudinal axis, and a second sealing portion (31) along the closed-loop trajectory, wherein the predetermined sealing direction is the axis.

2. The filter element according to claim 1, wherein the seal is at least partially located around the longitudinal axis of the media pack (2).

3. The filter element according to claim 1, further comprising a support structure (4) that is sealedly attached to the media pack (2), wherein the seal (3) is at least partially (or completely) supported by the support structure (4).

4. The filter element according to claim 3, wherein the support structure includes a smooth, continuous band surface following the seal, the band surface preferably corresponds to a closed-loop trajectory of the seal such that each section or portion of the seal has a corresponding portion of the band surface supporting it.

5. A filter assembly comprising a housing (100) and a filter element (1) according to any one of claims 1 to 4 held within the housing (100), wherein the housing (100) includes a predetermined sealing surface for receiving the seal (3) along the closed-loop trajectory, the sealing surface being complementary to the seal (3) having a predetermined sealing direction that is not constant, and the distance between the predetermined sealing surface of the housing for receiving the seal along the closed-loop trajectory and a smooth, continuous band surface of the support structure following the seal is maintained constant along the closed-loop trajectory.

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