Elastic sealing spring washer for filter assembly

Abstract

A screw-in filter includes a housing shell, a filter element, a nut plate, and a gasket. The filter element is positionable within the housing shell and includes filter media and an end plate. The nut plate is positionable within the housing shell. The gasket includes a central body and a spring-loaded extension. The spring-loaded extension circumferentially encircles the central body and extends radially from the central body. The spring-loaded extension is axially flexible between an expanded position and a compressed position. The spring-loaded extension forms and maintains a first seal with the end plate as the spring-loaded extension moves between the expanded position and the compressed position, and the spring-loaded extension maintains contact with the nut plate.

Description

[0001] Cross-referencing of related patent applications

[0002] This application claims priority and benefit to Indian Provisional Patent Application No. 202041025885, filed on June 19, 2020, the contents of which are incorporated herein by reference in their entirety.

[0003] field

[0004] This application generally relates to filtration systems for filtering fluids.

[0005] background

[0006] Internal combustion engines typically burn a mixture of fuel (such as gasoline, diesel, natural gas, etc.) and air. Lubricating oil is also supplied to the engine to lubricate its various moving parts. Before entering the engine or during engine operation, intake air, fuel, lubricating oil, and other fluids typically pass through a filter assembly to remove contaminants (such as dust, water, oil, etc.) from the fluid. A filter assembly includes filter elements with filter media. As fluid passes through the filter media, the filter media removes at least a portion of the contaminants from the fluid. Some filter assemblies, such as fuel and oil filtration systems, typically use screw-in filter assemblies. A screw-in filter assembly houses the filter elements and screws onto a filter mounting head to attach the filter assembly to the filtration system.

[0007] Various filter assemblies (particularly fluid filter assemblies with screw-in fluid filters) include nut plates positioned at the ends of the filter assembly, which provide a mechanism (e.g., internal thread) for attaching the filter head to a first end of the housing of the screw-in filter or for attaching a cap or cup to a second end of the housing of the filter.

[0008] Due to variations in height between different components within a filter assembly (especially a screw-in filter assembly), springs may be required to ensure proper compression and sealing between the filter element and the nut plate. For example, compression springs can be used to accommodate cumulative tolerances within the filter assembly. However, due to geometric and structural limitations in certain applications of filter assemblies (such as fuel-water separators and filters for air, lubricating oil, coolant, etc.), some filter assemblies cannot be accommodated using conventional compression springs to accommodate any cumulative tolerances.

[0009] In addition to the superimposed tolerances, a seal must be provided in the area between the head and the screw-in filter to prevent leakage into the environment outside the filter, and a seal must be provided between the flow inlet and the flow outlet to prevent unfiltered fluid from leaking from the inlet to the outlet of the filtered fluid. In particular, the filter assembly forms various seals (in the areas of the filter element end plates, screw-in nut plates, and / or the filter head outlet pipe (e.g., "spud")) to separate the filtered fluid from the unfiltered fluid.

[0010] Overview

[0011] Various embodiments provide a screw-in filter including a housing, a filter element, a nut plate, and a washer. The filter element is positionable within the housing and includes a filter medium and an end plate. The nut plate is positionable within the housing. The washer includes a central body and a spring-loaded extension. The spring-loaded extension circumferentially surrounds and extends radially from the central body. The spring-loaded extension is axially flexible between an expanded position and a compressed position. As the spring-loaded extension moves between the expanded and compressed positions, the spring-loaded extension forms a first seal with the end plate and maintains the first seal, and the spring-loaded extension remains in contact with the nut plate.

[0012] In some embodiments, the bottom surface of the spring-loaded extension forms the first sealing portion with the end plate, and the top surface of the spring-loaded extension forms the second sealing portion with the nut plate.

[0013] In some embodiments, the bottom surface and the top surface of the spring-loaded extension are concave for at least a portion of their respective radial length in the expanded position.

[0014] In some embodiments, the end plate defines an end plate through hole, the nut plate defines a nut plate through hole, and the center body of the washer defines a washer through hole, wherein the end plate through hole, the nut plate through hole, and the washer through hole are axially aligned with each other.

[0015] In some embodiments, at least a portion of the lower portion of the central body extends into the end plate through hole, and at least a portion of the upper portion of the central body extends into the nut plate through hole.

[0016] In some embodiments, the nut plate through-hole and the washer through-hole at least partially receive the post, wherein the central body of the washer forms a third seal with the post, wherein the third seal is maintained when the spring-loaded extension moves between the expanded position and the compressed position.

[0017] In some embodiments, the washer extends further axially in the expanded position than in the compressed position.

[0018] In some embodiments, the spring-loaded extension includes a flexible portion extending radially from the central body and a circumferential lip extending radially from the flexible portion.

[0019] In some embodiments, in the expanded position, the end of the circumferential lip extends axially below the flexible portion, and in the compressed position, the end of the circumferential lip is substantially radially aligned with the flexible portion.

[0020] In some embodiments, the connection between the central body and the spring-loaded extension is tapered, such that the thickness of the flexible portion gradually decreases as the flexible portion extends radially outward from the central body to the center portion of the flexible portion.

[0021] In some embodiments, the circumferential lip can be positioned in an axially extended position and a radially extended position, wherein in the axially extended position, the end of the circumferential lip is axially located below the flexible portion, and in the radially extended position, the end of the circumferential lip is substantially radially aligned with the flexible portion.

[0022] In some embodiments, the central body is at least partially located within an end plate through-hole defined by the inner surface of the end plate, wherein the central body includes at least one rib along the outer surface of the central body, wherein the at least one rib forms a gap between the outer surface of the central body and the inner surface of the end plate.

[0023] In some embodiments, a channel is defined between the bottom surface of the spring-loaded extension, the outer surface of the central body, and the top surface of the end plate, wherein the gap is fluidly connected to the channel.

[0024] In some embodiments, the gasket is a single integral component.

[0025] In some embodiments, the upper portion of the central body is tapered, such that the thickness of the central body above the spring-loaded extension in the axial direction is less than the thickness of the central body radially aligned with the spring-loaded extension.

[0026] In some embodiments, the spring-loaded extension is biased to move from the compressed position to the expanded position.

[0027] In some embodiments, as the spring-loaded extension moves between the expanded position and the compressed position, the spring-loaded extension moves relative to the end plate and the nut plate, and the central body remains in substantially the same position relative to the end plate and the nut plate.

[0028] In some embodiments, the axial height of the washer is smaller in the compressed position than in the expanded position, and the radial width of the washer is larger in the compressed position than in the expanded position.

[0029] Various other embodiments provide a gasket for a screw-in filter. The gasket includes a central body and a spring-loaded extension. The spring-loaded extension circumferentially surrounds the central body and extends radially from the central body. The spring-loaded extension is axially flexible between an expanded position and a compressed position. As the spring-loaded extension moves between the expanded and compressed positions, it forms and maintains a first seal with a first component of the screw-in filter, and the spring-loaded extension contacts a second component of the screw-in filter.

[0030] In some embodiments, when the spring-loaded extension moves between the expanded position and the compressed position, the spring-loaded extension forms a second seal with the second component of the spiral-in filter and retains the second seal.

[0031] In some embodiments, the spring-loaded extension includes a flexible portion extending radially from the central body and a circumferential lip extending radially from the flexible portion.

[0032] These and other features, as well as their organization and operation, will become apparent from the following detailed description in conjunction with the accompanying drawings, in which similar elements have similar reference numerals throughout the several drawings described below. Brief description of the attached diagram

[0034] Figure 1A This is a cross-sectional view of a spiral-in filter according to one embodiment.

[0035] Figure 1B It has Figure 1A A cross-sectional view of a portion of a screw-in filter assembly, wherein the gasket of the screw-in filter is in the expanded position.

[0036] Figure 1C yes Figure 1B A cross-sectional view of a portion of a filter assembly, with the gasket in a compressed position.

[0037] Figure 2A yes Figure 1B A perspective view of the gasket of a screw-in filter.

[0038] Figure 2B yes Figure 2A A cross-sectional view of the washer.

[0039] Figure 3A yes Figure 1B A cross-sectional view of a portion of a filter assembly, with the gasket in the expanded position.

[0040] Figure 3B yes Figure 1B A cross-sectional view of a portion of a filter assembly, showing the gasket positioned between an expanded and compressed position.

[0041] Figure 3C yes Figure 1B A cross-sectional view of a portion of a filter assembly, with the gasket in a compressed position.

[0042] Figure 4 yes Figure 1A A cross-sectional view of the gasket and end plate of a screw-in filter, with the gasket in the expanded position.

[0043] Figure 5A yes Figure 1A A bottom perspective view of the gaskets and end plates of a screw-in filter.

[0044] Figure 5B yes Figure 1A Bottom view of the gasket and end plate of the screw-in filter.

[0045] Figure 6 yes Figure 1A A cross-sectional perspective view of possible geometric variations of the gasket in a screw-in filter.

[0046] Detailed description

[0047] Referring generally to the accompanying drawings, the various embodiments disclosed herein relate to resilient sealing spring washers for filter assemblies. As a single integral component, the washer satisfies both the cumulative tolerance requirements of the filter assembly (by acting as a spring) and the sealing requirements of the filter assembly (by forming multiple seals within the filter assembly).

[0048] By acting as a biasing element, gaskets can absorb wide stack height tolerances, thus reducing the need for overly stringent tolerances for vertically stacked components (critical components and sub-assemblies). Therefore, by utilizing gaskets (which, as further described herein, function as both biasing elements and seals), the components, manufacturing, and overall cost within the filter assembly are reduced, and various constraints on manufacturing and quality control are alleviated (while still providing a fully functional filter assembly). Furthermore, gaskets eliminate the need for separate helical springs within the filter assembly to accommodate vertical stacking and eliminate the need for static sealing elements such as rotary shear washers, as well as radial and face O-rings.

[0049] Figure 1A A screw-in filter 21 according to one embodiment is shown. Figure 1B-1C An example of a portion of a filter assembly 20, including a screw-in filter 21 and a filter head 42, is shown. The screw-in filter 21 may be attached to the filter head 42 (e.g., via a nut plate 34 of the screw-in filter 21 and a post 44 of the filter head 42). Figure 1A As shown, the screw-in filter 21 includes a filter element 22, a filter housing 32, a nut plate 34, and a sealing spring washer 50. The filter assembly 20 (specifically, the filter element 22 of the screw-in filter 21) is configured to filter fluids. According to one embodiment, the filter assembly 20 may be a fuel-water separator, a screw-in filter assembly, or a dome filter. According to various embodiments, the filter assembly 20 may be used with a 13-liter or 15-liter engine. The filter assembly 20 can filter a variety of different fluids, including but not limited to air, lubricating oil, and coolant.

[0050] like Figure 1A As shown, the filter element 22 can be positioned within the housing shell 33 of the housing 32. The filter element 22 includes a filter medium 23, a lower end plate 28, and an upper end plate 24. The filter medium 23 is configured to filter fluid.

[0051] The lower end plate 28 and the upper end plate 24 are each positioned along opposite axial ends of the filter medium 23. The upper end plate 24 includes a top surface 26 and a bottom surface 27 opposite to each other. The top surface 26 of the upper end plate 24 faces away from the filter medium 23 in the axial direction and is configured to abut against and form a seal with the gasket 50 (as further described herein). The bottom surface 27 of the upper end plate 24 faces the filter medium 23 in the axial direction and is configured to abut against the filter medium 23.

[0052] End plate 24 defines a central opening or through-hole 25 through which unfiltered fluid can flow into the center of the filter medium 23, or through which filtered fluid can flow out from the center of the filter medium 23 (to be filtered or immediately after filtration, respectively). End plate 24 may have an axial extension, wherein the inner surface defines the end plate through-hole 25. The axial extension may be below the top surface 26 of end plate 24 and extend axially in a direction away from the top surface 26 of end plate 24. The axial extension may be at least partially located within the internal central region of the filter medium 23.

[0053] The housing 32 is configured to receive and house the filter element 22. The housing 32 includes a housing shell or body 33. The housing shell 33 surrounds the filter element 22 at least circumferentially. The filter medium 23 (and optionally, the entire filter element 22) can be completely assembled within the housing shell 33.

[0054] The nut plate 34 is positionable within the housing 33 and extends along the open end of the housing 33, and is at least partially or completely positioned within the housing 33, abutting against the inner surface of the housing 33. When the filter assembly 20 is assembled, the nut plate 34 is axially positioned between the open end of the housing 33 and the end plate 24 of the filter element 22. The nut plate 34 includes a top surface 36 and a bottom surface 37 opposite to each other. The top surface 36 is axially opposed to the filter element 22 and the washer 50, and axially faces the body 43 of the filter head 42 (e.g., Figure 1C (As shown). The bottom surface 37 faces upward axially toward the washer 50 and is configured to abut the washer 50 and form a seal with the washer 50 (as further described herein).

[0055] The nut plate 34 defines a central opening or through-hole 35 through which unfiltered fluid can flow into the center of the filter medium 23, or through which filtered fluid can flow out of the center of the filter medium 23 (either before or immediately after filtration). The nut plate through-hole 35 is configured to at least partially receive the post 44 of the filter head 42, such that the post 44 extends completely through the nut plate through-hole 35. Figures 1B to 1C As shown. The nut plate 34 may have an axial extension with an inner surface that defines a nut plate through-hole 35. The axial extension may extend axially above and away from the bottom surface 37 of the nut plate 34. The inner surface of the axial extension may include threads for threaded attachment to the outer surface of the post 44.

[0056] The filter head 42 may be part of the engine or otherwise attached to the engine. A screw-in filter 21 may be attached to the filter head 42 such that the open end of the housing 33 is closed by the filter head 42. For example... Figure 1C As shown, the filter head 42 includes a body 43 extending radially above an open end of the housing 33 and a module inlet or outlet pipe or column 44 (which may be referred to as a "third component") extending axially from the body 43. The body 43 is positioned outside the housing 33, while the column 44 is positioned inside the housing 33 and extends at least partially within the housing 33. A nut plate 34 is axially positioned between the body 43 and the end plate 24 of the filter head 42.

[0057] The column 44 extends axially from the inner or lower surface of the body 43 of the filter head 42, at least partially entering (and optionally passing through) the nut plate through-hole 35 and the washer through-hole 55 (as further described herein). The column 44 defines a central opening or through-hole 45 through which unfiltered fluid can flow into the center of the filter medium 23 or through which filtered fluid can flow out from the center of the filter medium 23 (to be filtered or immediately after filtration, respectively).

[0058] like Figures 1B to 1C As shown, the column 44 includes a base portion 46 and an end portion 47 (the through-hole 45 extends completely through the base portion 46 and the end portion 47). The base portion 46 of the column 44 is axially closer to the body 43 of the filter head 42 than the end portion 47 (and the end portion 47 of the column 44 is axially further away from the body 43 of the filter head 42 than the base portion 46). The outer surface of the base portion 46 of the column 44 includes threads configured to engage with threads on the inner surface of the axial extension of the nut plate 34 along the nut plate through-hole 35, thereby attaching and securing the screw-in filter 21 to the filter head 42. The end portion 47 of the outer surface of the column 44 is unthreaded (according to one embodiment) and configured to extend into the gasket through-hole 55 to abut against the inner surface of the gasket through-hole 55 and form a radial seal (as further described herein).

[0059] When the screw-in filter 21 is assembled, the end plate through-hole 25, the nut plate through-hole 35, the column through-hole 45, and the washer through-hole 55 (as well as the column through-hole 45) are all axially aligned with each other and share a common central axis 29, thereby forming a path for unobstructed flow of fluid between the center of the filter medium 23 and the filter head 42. Furthermore, the end plate 24, the washer 50, and the column 44 are all positioned along the same side (e.g., the upper side) of the filter medium 23.

[0060] like Figures 1B to 1CAs shown, gasket 50 is a geometrically flexible elastomeric component that spans the gap between two or more other components aligned along the same axis within the filter assembly 20. As used herein, "gasket" refers to a molded material part or component used to form a seal between component surfaces.

[0061] Washer 50 is axially positioned between end plate 24 and nut plate 34 of filter element 22. Due to the geometry and material of washer 50, washer 50 is configured to be in the expanded position 56 (e.g., Figure 1B (as shown) and compression position 58 (as shown) Figure 1C As further described herein, the gasket 50 moves and flexes between the filter elements 22 and filter head 42 (as shown). Therefore, as further described herein, the gasket 50 is configured to act as a biasing member (particularly a compression spring) within the screw-in filter 21 by being geometrically flexible and compressible (this allows the gasket 50 to form and retain radial and / or axial seals with each of the end plate 24, nut plate 34, and post 44 within a range of varying axial clearances between the filter element 22 and filter head 42) and moving between minimum compression (i.e., expansion position 56) and maximum compression (i.e., compression position 58). The gasket 50 reduces the cost of the filter assembly 20 by functioning both as a biasing member and forming a seal within a wide tolerance range of the axial distance between the filter element 22 and filter head 42. Furthermore, by providing two functions (i.e., sealing gasket and biasing member) in one component, the gasket 50 thus reduces the number of components required within the filter assembly 20 (and therefore also reduces the cost of the filter assembly 20).

[0062] Washer 50 is constructed as a single piece providing multiple functions (i.e., spring and sealing). Therefore, washer 50 comprises a single, integral, monolithic component that cannot be separated without damage. The entire washer 50 may be a molded part. Washer 50 may be made of a variety of different elastomeric materials (including, but not limited to, nitrile).

[0063] like Figures 2A to 2B As shown, the washer 50 includes an axially extending central body 61 and a spring-loaded extension 71. As further described herein, the central body 61 and the spring-loaded extension 71 are attached or connected together along their radially outer and inner surfaces, respectively. The washer 50 also includes a first sealing region 51a, a second sealing region 52a, and a third sealing region 53a (as shown). Figure 2BAs shown, the first sealing region 51a, the second sealing region 52a, and the third sealing region 53a are configured to form and retain the first sealing portion 51, the second sealing portion 52, and the third sealing portion 53, as further described herein. The central hub, skirt, or body 61 of the washer 50 defines a central opening or through-hole 55 through which unfiltered fluid can flow into the center of the filter medium 23, or through which filtered fluid can flow out from the center of the filter medium 23 (to be filtered or immediately after filtration, respectively). The central axis of the washer through-hole 55 is axially aligned (along central axis 29) with the corresponding central axes of the end plate through-hole 25, the nut plate through-hole 35, and the column through-hole 45.

[0064] exist Figures 2A to 2B In this embodiment, the central body 61 is axially longer than the spring-loaded extension 71 (i.e., extends axially above and below the extension 71) to form a third sealing portion 53 with the post 44 (as further described herein) and extends axially into the end plate through-hole 25. Therefore, the central body 61 includes a bottom portion or lower portion (extending axially below the flexible portion 72 of the spring-loaded extension 71) and a top portion or upper portion (extending axially above the flexible portion 72 of the spring-loaded extension 71). At least a portion of the lower portion of the central body 61 extends into and is positioned within the end plate through-hole 25, and at least a portion of the upper portion of the central body 61 extends into and is positioned within the nut plate through-hole 35.

[0065] Third sealing area 53a (e.g.) Figure 2B The gasket 50 extends along and is defined by the inner surface of the upper portion of the central body 61 (which defines the gasket through-hole 55). The gasket 50 is configured to form a third seal 53 anywhere along the length of the third sealing region 53a (i.e., anywhere along the length of the inner surface of the upper portion of the central body 61) depending on the position of the gasket 50 (i.e., the expanded position 56, the compressed position 58, or a position between the expanded and compressed positions). The third sealing region 53a extends completely around the gasket through-hole 55 to form a peripheral seal (i.e., the third seal 53).

[0066] like Figure 2A and Figures 4 to 5B As shown, the central body 61 includes at least one vertically extending or axially extending rib 63 (preferably multiple ribs 63) extending along a portion of the axial length of the central body 61 (along the outer surface of the lower portion of the central body 61). Each rib 63 extends radially outward from the outer surface of the central body 61. Multiple ribs 63 are intermittently positioned around the outer surface of the central body 61. The ribs 63 are configured to directly contact or abut the inner surface of the defining end-plate through-hole 25 of the end plate 24 (e.g., ...). Figure 4(As shown). Therefore, rib 63 is located between the outer surface of the central body 61 and the inner surface of the end plate 24, or radially positioned between the outer surface of the central body 61 and the inner surface of the end plate 24. Ribs 63 are configured to space apart or form gaps 65 that extend radially between the outer surface of the central body 61 and the inner surface of the end plate 24 and axially extend along at least a portion of the axial length of rib 63. The shape and number of ribs 63 depend on the desired amount of friction reduction and the desired mating component fit.

[0067] Rib 63 is a relief feature that radially spaces the outer surface of the central body 61 from the inner surface of the end plate 24 to form a fluid passage between the outer surface of the central body 61 and the inner surface of the end plate 24. Therefore, rib 63 allows fluid (e.g., air) to flow axially along the axial length of rib 63 within gap 65 (as further described herein) and radially between the outer surface of the lower portion of the central body 61 and the inner surface of the end plate 24, particularly when the washer 50 moves between the expanded position 56 and the compressed position 58. As further described herein, this fluid passage prevents suction or vacuum effects within channel 82 (between washer 50 and end plate 24). By preventing suction within channel 82, washer 50 can move effectively and act as a biasing member.

[0068] Rib 63 also allows for greater axial movement of washer 50 relative to end plate 24 by reducing friction between the corresponding mating surfaces of washer 50 and end plate 24. This maintains the spring function of washer 50 and prevents the elastomeric material from mechanically binding to the inner surface of end plate 24 (along the end plate through-hole 25). This reduction in friction is particularly beneficial when washer 50 is fully compressed in compression position 58 or compressed through a large percentage of its axial range. Due to the compressive stress in these conditions, the elastomeric material of washer 50 can cause the outer diameter of the lower portion of the central body 61 to expand radially beyond the diameter of the end plate through-hole 25. Without rib 63, such expansion could cause the washer to be mechanically held to the inner surface of end plate 24. Rib 63 reduces this surface interference by reducing the surface contact between washer 50 and the inner surface of end plate 24.

[0069] Rib 63 also maintains the concentric position of washer 50 relative to mating components (e.g., end plate 24, nut plate 34, and post 44). Specifically, rib 63 axially centers and positions washer 50 about the central axis of end plate 24. Therefore, the central axis of end plate 24 (and the center of end plate through-hole 25) is aligned with... Figures 1A to 1C The central axis 29 shown is aligned, and the lower portion of the central body 61 (and the washer through hole 55) is concentric within the axial extension of the end plate 24 (which defines the end plate through hole 25), as shown. Figure 5B As shown.

[0070] To prevent inappropriate or excessive contraction or expansion of the inner diameter of the central body 61 (i.e., the inner diameter of the gasket through-hole 55) (which forms the third sealing portion 53, as further described herein) when the gasket 50 is axially compressed toward the compression position 58, the upper portion of the central body 61 is tapered, as shown below. Figure 2B As shown. Figure 3A As shown, the outer surface of the upper portion of the central body 61 contacts the nut plate 34, and the inner surface of the upper portion of the central body 61 contacts the post 44 (forming a third sealing portion 53 with the post 44). Specifically, as the upper portion of the central body 61 extends axially above the top surface 76 of the spring-loaded extension 71 (as further described herein), the upper portion of the central body 61 is tapered, such that the thickness of the central body 61 axially above the spring-loaded extension 71 is less than the thickness of the central body 61 radially aligned with the spring-loaded extension 71. Therefore, as... Figure 2B As shown, the central body 61 is radially tapered (and its thickness increases) from the top of the upper part of the central body 61 to the connection between the central body and the spring-loaded extension 71.

[0071] In addition, such as Figure 2B As shown, the lower part of the central body 61 is also conical. (As...) Figure 3A As shown, the outer surface of the lower portion of the central body 61 contacts the inner surface of the end plate 24 (which defines the end plate through hole 25). As the lower portion of the central body 61 extends axially below the bottom surface 77 of the spring-loaded extension 71 (as further described herein), the lower portion of the central body 61 is tapered, such that the thickness of the central body 61 axially below the spring-loaded extension 71 is less than the thickness of the central body 61 radially aligned with the spring-loaded extension 71. Therefore, as... Figure 2B As shown, the central body 61 is radially tapered (and its thickness increases) from the bottom end of the lower part of the central body 61 to the connection between the central body and the spring-loaded extension 71.

[0072] like Figure 2BAs shown, in order to connect or link the central body 61 and the spring-loaded extension 71 together, the radially inner surface of the spring-loaded extension 71 (i.e., the radially inner end of the flexible portion 72) extends from the radially outer surface of the central body 61 at an axial position between the upper and lower portions of the central body 61. The connection or link between the central body 61 and the spring-loaded extension 71 may be tapered (along both the top and bottom surfaces of the flexible portion 72) such that the thickness of the flexible portion 72 gradually decreases as it extends radially outward from the central body 61 to its central portion. However, as further described herein, the washer 50 as a whole (which includes the central body 61 and the spring-loaded extension 71) is a single integral component.

[0073] like Figures 2A to 2B As shown, the spring-loaded extension 71 of the washer 50 circumferentially surrounds the central body 61 and extends radially from the central body 61. Due to the geometry and material of the spring-loaded extension 71, the spring-loaded extension 71 is axially flexible between the expanded position 56 and the compressed position 58 (as further described herein). The spring-loaded extension 71 is biased to move from the compressed position 58 to the expanded position 56. The spring-loaded extension 71 includes a top surface 76 and a bottom surface 77 opposite to each other. The top surface 76 faces the nut plate 34 axially, and the bottom surface 77 faces the end plate 24 axially.

[0074] The spring-loaded extension 71 is tapered along the radial length of the flexible portion 72. Specifically, the connection or link between the flexible portion 72 and the circumferential lip 74 is tapered (along the top surface 76 and bottom surface 77 of the flexible portion 72), such that the thickness of the flexible portion 72 gradually increases as it extends radially outward (from the center portion of the flexible portion 72) to the circumferential extension 71. Therefore, the center portion of the flexible portion 72 is thinner than its radially inner and radially outer ends.

[0075] like Figure 2B As shown, the top surface 76 of the spring-loaded extension 71 extends along the top surface of the circumferential lip 74 and the top surface of the flexible portion 72 (referencing the gasket in the compressed position 58). The second sealing region 52a (as shown) Figure 2BAs shown, the gasket 50 extends along the top surface 76 of the spring-loaded extension 71 (along the respective top surfaces of the circumferential lip 74 and the flexible portion 72) (and is defined by the top surface 76). The gasket 50 is configured to form a second seal 52 anywhere along the second sealing region 52a (e.g., along the top surface of the circumferential lip 74 and / or the top surface of the flexible portion 72) depending on the position of the gasket 50 (i.e., the expanded position 56, the compressed position 58, or a position between the expanded and compressed positions). The second sealing region 52a extends completely around the inner portion of the gasket 50 (i.e., around the central body 61) to form a peripheral seal (i.e., the second seal 52).

[0076] In order to form and retain the second seal 52 (as further described herein) as the gasket 50 moves between the expanded position 56 and the compressed position 58, the top surface 76 (and the second sealing region 52a) is curved, tapered, or rounded, and slopes downward along its radial length and axially along the flexible portion 72 (in the direction toward the bottom surface 77) in the expanded position 56. Therefore, at least a portion of the top surface 76 (and the second sealing region 52a) along its radial length in the expanded position 56 is concave.

[0077] like Figure 2B As shown, the bottom surface 77 of the spring-loaded extension 71 extends along the end 75 and inner surface 74a of the circumferential lip 74 and along the bottom surface of the flexible portion 72. The first sealing region 51a (as shown) Figure 2B The gasket 50 extends along the bottom surface 77 (including the end 75) of the spring-loaded extension 71 (along the bottom surface of the circumferential lip 74, and optionally also along the bottom surface of the flexible portion 72) and is defined by the bottom surface 77. The gasket 50 is configured to form a first seal 51 anywhere along the first sealing region 51a (e.g., along the bottom surface of the circumferential lip 74 and / or the bottom surface of the flexible portion 72) depending on the position of the gasket 50 (i.e., the expanded position 56, the compressed position 58, or a position between the expanded and compressed positions). The first sealing region 51a extends completely around the inner portion of the gasket 50 (i.e., around the central body 61) to form a peripheral seal (i.e., the first seal 51).

[0078] In order to form and retain the first seal 51 (as further described herein) as the gasket 50 moves between the expanded position 56 and the compressed position 58, the bottom surface 77 (and the first sealing region 51a) is curved, tapered, or rounded, and slopes upward along its radial length and axially along the flexible portion 72 (in the direction toward the top surface 76) in the expanded position 56. Therefore, at least a portion of the bottom surface 77 (and the first sealing region 51a) along its radial length in the expanded position 56 is concave.

[0079] The spring-loaded extension 71 includes a deformable or flexible portion 72 and a circumferential lip 74. The flexible portion 72 is a thinned area of ​​the spring-loaded extension 71 that moves, flexes, or deforms when the washer 50 moves between an expanded position 56 and a compressed position 58. The flexible portion 72 extends radially from and circumferentially around the central body 61, and the circumferential lip 74 extends radially from and circumferentially around the flexible portion 72 (such that the flexible portion 72 is radially positioned between the central body 61 and the circumferential lip 74 and connects the central body 61 and the circumferential lip 74). Figure 3A As shown, in the expanded position 56, the main body of the circumferential lip 74 extends axially below the flexible portion 72, as further described herein. Figure 3C As shown, in the compression position 58, the flexible portion 72 deforms, causing the main body of the circumferential lip 74 and the flexible portion 72 to be roughly aligned radially.

[0080] The flexible portion 72 is thinner axially than the circumferential lip 74 and the central body 61 (in the expansion position 56 and the compression position 58), which allows the flexible portion 72 to flex or deform (thus allowing the washer 50 to move between the expansion position 56 and the compression position 58). Therefore, when the washer 50 is compressed and moved from the expansion position 56 to the compression position 58, the washer 50 flexes primarily along the flexible portion 72 (although other portions of the washer 50 may also flex and deform). When the flexible portion 72 flexes to move the washer 50 from the expansion position 56 to the compression position 58, the flexible portion 72 rotates or moves the circumferential lip 74 from the axially extended position to the radially extended position (e.g., as...). Figures 3A to 3C (As shown and further described herein).

[0081] like Figure 2B As shown, this illustrates the washer 50 in the expanded position 56. The circumferential lip 74 extends axially above and below the flexible portion 72, and is therefore axially thicker than the flexible portion 72, to provide sufficient structure and support for the washer 50 (particularly the spring-loaded extension 71). Figures 3A to 3C As shown, when the flexible portion 72 flexes and moves, the circumferential lip 74 moves between an axially extended position (when the washer 50 is in the expanded position 56) and a radially extended position (when the washer 50 is in the compressed position 58), thereby allowing the washer 50 to expand and compress axially between the expanded position 56 and the compressed position 58.

[0082] A circumferential lip 74 extends radially from the flexible portion 72 and includes a rounded end 75, which is the point furthest from the connection between the circumferential lip 74 and the flexible portion 72. The circumferential lip 74 also includes a first surface and a second surface (here referred to as inner surface 74a and outer surface 74b) located on opposite sides of the circumferential lip 74. The rounded end 75 lies between the inner surface 74a and the outer surface 74b (along the outer surface of the circumferential lip 74). The inner surface 74a and the outer surface 74b are generally flat surfaces that taper towards each other (i.e., towards the rounded end 75). Therefore, the circumferential lip 74 is thicker along the connection between the circumferential lip 74 and the flexible portion 72 than along the rounded end 75.

[0083] In the expanded position 56, the circumferential lip 74 is in an axially extended position, such that the rounded end 75 of the circumferential lip 74 is axially located below the flexible portion 72, and the inner surface 74a and the outer surface 74b extend in a generally axial manner, as... Figure 1B As shown. However, since the inner surface 74a and the outer surface 74b are tapered, in this position, the inner surface 74a and the outer surface 74b are also at an angle relative to the central axis 29. In particular, in the expanded position 56, the inner surface 74a and the outer surface 74b (and therefore the entire circumferential lip 74) are at an angle away from the central axis 29 in a direction away from the connection point between the circumferential lip 74 and the flexible portion 72, as shown. Figure 3A As shown.

[0084] In the compressed position 58, the circumferential lip 74 is in a radially extended position, such that the rounded end 75 of the circumferential lip 74 is substantially radially aligned with the flexible portion 72, and the inner surface 74a of the circumferential lip 74 extends radially substantially parallel to the top surface 26 of the end plate 24, as... Figure 1C As shown. The outer surface 74b of the circumferential lip 74 also extends radially. However, due to the tapered shape of the circumferential lip 74, in the compressed position 58, the outer surface 74b is angled downward relative to the radial plane (along the direction from the connection point between the circumferential lip 74 and the flexible portion 72 toward the end 75).

[0085] like Figures 3A to 3CAs shown, the washer 50 (particularly the spring-loaded extension 71) is configured to axially compress, deform, or flex between the expansion position 56 and the compression position 58, thereby acting as a compression spring within the screw-in filter 21. By acting as a biasing member with a full range of motion and maintaining various seals during movement, the washer 50 eliminates the need for providing springs (particularly the spring between the filter element and the nut plate) and separate seals. Furthermore, by being movable between two different positions (and acting as a biasing member), the washer 50 allows for greater flexibility in its height stacking capacity (and a wider range of permissible stacking height errors) and also creates a more consistent seal at various different heights. By being movable between the expansion position 56 and the compression position 58 (and being fixed within the screw-in filter 21 at any position between the expansion and compression positions), the washer 50 is configured to be received and fitted within a wide range of axial clearances in different filter assemblies (while still forming at least two seals, as further described herein).

[0086] When washer 50 is in the expanded position 56 (e.g.) Figure 1B and Figure 3A As shown, washer 50 is not axially compressed or is only minimally compressed axially, and the spring-loaded extension 71 extends axially such that the axial height of the spring-loaded extension 71 (and the total height of washer 50) in the expanded position 56 is greater than in the compressed position 58. Therefore, washer 50 extends further axially in the expanded position 56 than in the compressed position 58. In the expanded position 56, the end 75 of the circumferential lip 74 extends axially below the flexible portion 72, and the circumferential lip 74 is closer to the end plate 24 than the flexible portion 72.

[0087] When washer 50 moves from expansion position 56 to compression position 58 (as shown in the image) Figures 3A to 3C (As shown) and when the washer 50 is partially compressed, the flexible portion 72 bends or flexes, which allows the spring-loaded extension 71 to move or rotate radially outward about the connection point between the flexible portion 72 and the circumferential lip 74 (as shown). Figure 3BAs shown, the circumferential lip 74 (and the entire spring-loaded extension 71) is moved from an axially extending position to a radially extending position. Therefore, as the washer 50 moves from the expanded position 56 to the compressed position 58, the axial height of the washer 50 decreases, and the radial width (or outer diameter) of the washer 50 increases. As the spring-loaded extension 71 moves relative to the central body 61 (and the end plate 24 and nut plate 34) between the expanded position 56 and the compressed position 58, the circumferential lip 74 moves relative to the central body 61 (and the end plate 24 and nut plate 34) between the axially extending position and the radially extending position, and the central body 61 maintains substantially the same position relative to the end plate 24 and nut plate 34 (i.e., axially extending between the upper and lower portions of the central body 61 and between the end plate 24 and nut plate 34).

[0088] When washer 50 is in the compressed position 58 (e.g.) Figure 1C and 3C As shown), washer 50 is fully axially compressed, and spring-loaded extension 71 is axially compressed, such that... Figure 3C As shown, with Figure 3A In comparison, the axial height of the spring-loaded extension 71 (and the total axial height of the washer 50) is smaller or reduced in the compressed position 58 (compared to the expanded position 56). In the compressed position 58, the flexible portion 72 flexes, causing the circumferential lip 74 to rotate and open outward or pivot (in the radially extended position), and the end 75 of the circumferential lip 74 is substantially radially aligned with the flexible portion 72. Therefore, in the compressed position 58, the washer 50 further expands, extends, or opens outward radially (relative to the expanded position 56), and as... Figure 3C As shown, with Figure 3A In contrast, because the circumferential lip 74 pivots radially outward around the connection point between the flexible portion 72 and the circumferential lip 74, the radial width of the spring-loaded extension 71 (and the total radial width of the washer 50) is larger or increased in the compressed position 58 (compared to the expanded position 56). When the end 75 of the circumferential lip 74 moves radially outward, the top surface of the circumferential lip 74 pivots radially inward, and the inner surface of the central body 61 (which forms the third seal 53) contracts radially.

[0089] In both the expansion position 56 and the compression position 58 (and various positions in between), the washer 50 is configured to axially and / or radially span the gap between two or more components aligned along the same axis (i.e., central axis 29) within the filter assembly 20. By being movable between the expansion position 56 and the compression position 58, the washer 50 can accommodate and span a series of axial gaps of different sizes between two or more components within the filter assembly 20. Specifically, as... Figures 1B to 1C and Figures 3A to 3CAs shown, the sealing spring washer 50 is axially positioned between the top surface 26 of the end plate 24 of the filter element 22 and the bottom surface 37 of the nut plate 34 (and axially spans axial gaps of varying sizes). The sealing spring washer 50 (particularly the upper portion of the central body 61) is also radially positioned between the inner surface of the nut plate through hole 35 and the outer surface of the post 44 (and radially spans the gap between the inner surface of the nut plate through hole 35 and the outer surface of the post 44).

[0090] The gasket 50 is configured to form at least two seals (e.g., three seals) in the area that contacts at least two other adjacent components of the filter assembly 20 (e.g., mating surfaces of three other components) to maintain separation of filtered and unfiltered fluid. Specifically, the outer surface of the gasket 50 (particularly sealing regions 51a, 52a, 53a) is configured to conform to the surfaces of adjacent components to form various seals. Since the gasket 50 also acts as a biasing member and is biased to move from the compressed position 58 to the expanded position 56, the gasket 50 maintains at least two seals within its axial and radial range of movement as it moves between the expanded position 56 and the compressed position 58. These at least two seals can be radial and / or axial (or surface) seals. By forming at least two sealing portions (and due to the elastomeric material), the gasket 50 provides resistance to prevent the filter element 22 from rotating internally within the housing 33, for example when the transparent glass bowl is screwed on or off, thereby reducing or eliminating the need for additional anti-rotation measures.

[0091] like Figures 1B to 1C and Figures 3A to 3C As shown, washer 50 (particularly spring-loaded extension 71) forms and retains a first seal 51 with a first component (e.g., end plate 24) along a first sealing region 51a, and forms and retains a second seal 52 with a second component (e.g., nut plate 34) along a second sealing region 52a. Washer 50 (particularly center body 61) also forms and retains a third seal 53 with a third component (e.g., post 44) along a third sealing region 53a. Both the first seal 51 and the second seal 52 are at least partially axial seals, and the third seal 53 is at least partially radial. As noted herein, an axial seal may include radial components, but axial is more predominant than radial. Similarly, a radial seal may include axial components, but radial is more predominant than axial. Each of the first seal 51, the second seal 52, and the third seal 53 is a peripheral seal extending around the entire periphery of washer 50.

[0092] Figures 3A to 3CThe diagram shows the movement of gasket 50 between an expanded position 56 and a compressed position 58. As shown, gasket 50 is configured to retain each of the first seal 51, the second seal 52, and the third seal 53 when gasket 50 is axially compressed (or axially expanded) (i.e., when gasket 50 (particularly the spring-loaded extension 71) moves between the expanded position 56 and the compressed position 58). To retain each of the seals 51, 52, and 53 during movement, the corresponding sealing surfaces of gasket 50 are rounded or curved, which allows the seals 51, 52, and 53 to move with the movement of gasket 50.

[0093] For the first seal 51, a first sealing region 51a defined by the bottom surface 77 of the spring-loaded extension 71 forms the first seal 51 with the first component (hereinafter referred to as end plate 24). Therefore, the first sealing region 51a (i.e., the bottom surface 77 of the spring-loaded extension 71) is curved or rounded and concave to allow the washer 50 to form the first seal 51 with the end plate 24 when the washer 50 moves between the expanded position 56 and the compressed position 58. Specifically, in the expanded position 56 (e.g.... Figure 3A As shown), the end 75 of the circumferential lip 74 forms a first sealing portion 51 with the end plate 24. When the washer 50 is compressed and changes shape and moves partially toward the compression position 58 (as shown), Figure 3B As shown), the first sealing portion 51 moves along the bottom surface 77 (and along the first sealing region 51a) from the end of the end 75 of the circumferential lip 74 toward and around the rounded edge of the circumferential lip 74 (which is between the end of the end 75 and the inner surface 74a of the circumferential lip 74). As the gasket 50 is further compressed and enters the compression position 58 (as shown), Figure 3C As shown, the entire inner surface 74a of the circumferential lip 74 (and the bottom surface of the flexible portion 72) flattens and presses against the top surface 26 of the end plate 24. Therefore, in the compressed position 58, the inner surface 74a of the circumferential lip 74 and the bottom surface of the optional flexible portion 72 form a first seal 51 with the top surface 26 of the end plate 24. Furthermore, as the gasket 50 moves from the expanded position 56 to the compressed position 58, the first seal 51 also moves radially outward along the top surface 26 of the end plate 24.

[0094] For the second seal 52, the second sealing region 52a defined by the top surface 76 of the spring-loaded extension 71 forms the second seal 52 with the second component (hereinafter referred to as the nut plate 34). Therefore, the second sealing region 52a (i.e., the top surface 76 of the spring-loaded extension 71) is curved or rounded and concave to allow the washer 50 to form the second seal 52 with the nut plate 34 (and thus remain in contact with the nut plate 34) when the spring-loaded extension 71 of the washer 50 moves between the expanded position 56 and the compressed position 58. Specifically, the top surface 76 of the spring-loaded extension 71 along the flexible portion 72 and / or along the circumferential lip 74 (which corresponds to the second sealing region 52a) forms the second seal 52 with the nut plate 34 (e.g., with the convex portion of the bottom surface 37 of the nut plate 34). In the expanded position 56 (as shown in the image)... Figure 3A As shown), the top surface of the flexible portion 72 (or the top surface at the connection point between the flexible portion 72 and the circumferential lip 74) forms a second sealing portion 52 with the nut plate 34. When the washer 50 is compressed and changes shape and moves partially toward the compression position 58 (as shown), Figure 3B As shown), the top surface 76 bends further inward (i.e., becomes increasingly concave), causing the top surface 76 to move radially inward. Therefore, as the circumferential lip 74 rotates radially outward, the position of the second seal 52 moves radially outward along the top surface 76 (and along the second sealing region 52a) toward the top surface of the circumferential lip 74. When the gasket 50 is further compressed and moved to the compression position 58 (as shown), Figure 3C When (as shown), the corresponding top surfaces of the flexible portion 72 and / or the circumferential lip 74 form a second sealing portion 52.

[0095] For the third sealing portion 53, the gasket through-hole 55 is configured to receive the post 44, such that the post 44 extends through the gasket through-hole 55, and the third sealing region 53a defined by the inner surface of the central body 61 and the outer surface of the post 44 form the third sealing portion 53. Figures 3A to 3C As shown, the top surface of the central body 61 (and therefore the third sealing region 53a) can be bent radially inward to retain the third sealing region 53 when the spring-loaded extension 71 moves, causing the rest of the washer 50 to move accordingly. During assembly, the top surface of the central body 61 can be clamped between the post 44 and the nut plate through-hole 35.

[0096] Washer 50 can be in expansion position 56 (e.g.) Figure 3AThe gasket 50 is compressed only minimally in order to generate the necessary sealing force at each location of the sealing portions (i.e., seals 51, 52, 53) and to maintain fluid separation under the pressure experienced during filtration and fluid flow. When the gasket 50 is axially loaded and compressed by any amount between the expanded position 56 and the compressed position 58, the gasket 50 exerts positive and opposite axial reaction forces due to the geometry of the gasket 50 and the resulting offset, to move from the compressed position 58 to the expanded position 56. Once the gasket 50 is compressed beyond its "closed height" (where "closed height" refers to the height at which the flexible portion 72 can no longer flex, move, or rotate the circumferential lip 74 to accommodate further axial loads, such as...), Figure 3C As shown, the elastic material of the gasket 50 further supports the axial load, and the gasket 50 further deforms or shifts to support the load. When the gasket 50 is compressed to its maximum extent, the seals 51, 52, and 53 are still maintained.

[0097] When washer 50 is in the expanded position 56 (or between the expanded position 56 and the compressed position 58), washer 50 defines a main cavity or channel 82 along the concave portion of the bottom surface 77, such as Figures 1B to 1C and Figure 4 As shown. When washer 50 is in the compressed position 58, channel 82 can be significantly smaller (e.g. Figure 1C (as shown) or complete collapse (as shown) Figure 3C (As shown). Channel 82 is defined by the concave portion of the bottom surface 77 of the spring-loaded extension 71 (particularly the inner surface of the spring-loaded extension 71 and the bottom surface of the flexible portion 72), the outer surface of the central body 61, and the top surface 26 of the end plate 24 (when assembled). Channel 82 has an approximately semi-circular cross-section.

[0098] When the washer 50 is attached to the end plate 24, the top surface 26 of the end plate 24 partially closes the bottom of the channel 82. In the expanded position 56, the first seal 51 (formed between the end 75 of the circumferential lip 74 and the top surface 26 of the end plate 24) defines the radial outer edge or outermost periphery of the channel 82. The gap 65 between the ribs 63 is fluidly connected to the channel 82, so that when the washer 50 moves relative to the end plate 24 between the expanded position 56 and the compressed position 58, the ribs 63 prevent suction or vacuum effects within the channel 82 (between the washer 50 and the end plate 24) and prevent fluid from being trapped in the channel 82 between the bottom surface 77 of the washer 50 and the top surface 26 of the end plate 24.

[0099] Because the ribs 63 of the central body 61 of the washer 50 radially separate the outer surface of the central body 61 from the inner surface of the end plate 24 (defining the end plate through-hole 25), a gap 65 is created between the outer surface of the central body 61 and the inner surface of the end plate 24. The gap 65 defines a fluid flow path between the end plate 24 and the central body 61, allowing fluid to enter or exit the channel 82 (from the central region of the filter element 22) as the washer 50 moves between the expanded position 56 and the compressed position 58. Without the ribs 63, a suction effect might occur within the channel 82, reducing the washer 50's ability to effectively function as a biasing member.

[0100] In the expanded position 56, the channel 82 is filled with fluid (e.g., air). When the washer 50 is axially compressed toward the compressed position 58 and into the compressed position 58, the volume of the channel 82 decreases, allowing fluid in the channel 82 to flow out of the channel 82 through the gap 65 (and out of the entire washer 50). Conversely, when the washer 50 is allowed to move back from the compressed position 58 to the expanded position 56, the volume of the channel 82 increases, and fluid flows into the channel 82 through the gap 65.

[0101] Figure 6 Potential geometric variations of gasket 50 are illustrated to tailor its properties to specific uses and applications. For example, by adding or removing material at different critical regions, gasket 50 is optimized to reduce material strain, increase flexibility, enhance the formation of seals 51, 52, and 53, and optimize the configuration of gasket 50 based on varying diameters of the mating surfaces of end plate 24, nut plate 34, and post 44. Various curvatures and dimensions can be varied according to desired configurations while maintaining the general structure of gasket 50 (e.g., the general structure of the central body 61 and spring-loaded extension 71). For example, the curvature of the bottom surface 77 of spring-loaded extension 71, the height of the circumferential lip 74, the width of the top portion of the circumferential lip 74, the diameter of the gasket through-hole 55, the height of the central body, the outer diameter of the central body 61, and / or the outer diameter of gasket 50 can be modified according to desired uses and configurations. However, various features (including, but not limited to, the flexible portion 72 and circumferential lip 74 of the spring-loaded extension 71, the structural relationship between the spring-loaded extension 71 and the central body 61, and the ability of the gasket 50 to act as a biasing member and form the various seals described herein) remain unchanged under any variation in curvature and size.

[0102] Each of the various embodiments disclosed herein may have any aspect, feature, component, and configuration of other embodiments, unless otherwise stated.

[0103] As used herein, the term "about" and similar terms are intended to have a broad meaning consistent with common acceptable use by one of ordinary skill in the art to which the subject matter of this disclosure pertains. The term "about" as used herein refers to ±5% of a reference measurement, location, or dimension. Those skilled in the art, upon reviewing this disclosure, will understand that these terms are intended to allow for the description of certain features described and claimed, without limiting the range of these features to the precise numerical values ​​provided. Therefore, these terms should be interpreted as indicating that non-substantial or irrelevant modifications or alterations to the described and claimed subject matter are considered to be within the scope of the invention as set forth in the appended claims.

[0104] As used herein, the terms “connection”, “attachment”, etc., refer to two components that are directly connected to each other. Such connection can be fixed (e.g., permanent) or movable (e.g., removable or releasable).

[0105] References to the location of elements herein (e.g., “top,” “bottom,” etc.) are used only to describe the orientation of the various elements in the accompanying drawings. It should be noted that the orientation of the various elements may differ according to other exemplary embodiments, and these variations are intended to be included in this disclosure.

[0106] It is important to note that the construction and arrangement of the various exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art upon reviewing this disclosure will readily recognize that many modifications (e.g., variations in the size, dimensions, structure, shape and proportions of various elements, values ​​of parameters, installation arrangements, use of materials, color, orientation, etc.) are possible without substantially departing from the novel teachings and advantages of the subject matter described herein. For example, the positions of elements may be reversed or otherwise altered, and the nature or number of discrete elements or positions may be changed or modified. According to alternative embodiments, the order or sequence of any process or method steps may be changed or reordered. Other substitutions, modifications, variations, and omissions may also be made in the design, operating conditions, and arrangements of the various exemplary embodiments without departing from the scope of the invention.

Claims

1. A spiral-in filter, comprising: Shell and outer casing; A filter element, which can be positioned within the housing housing and includes a filter medium and an end plate; A nut plate that can be positioned inside the housing shell; as well as Washers, which include: The main body, and A spring-loaded extension circumferentially surrounds the central body and extends radially from the central body; the spring-loaded extension is axially flexible between an expanded position and a compressed position. When the spring-loaded extension moves between the expanded position and the compressed position, the spring-loaded extension forms a first sealing portion with the end plate and maintains the first sealing portion, and the spring-loaded extension remains in contact with the nut plate. The bottom surface of the spring-loaded extension forms the first sealing portion with the end plate, and the top surface of the spring-loaded extension forms the second sealing portion with the nut plate.

2. The screw-in filter according to claim 1, wherein, The bottom surface of the spring-loaded extension is concave along its radial length in the expanded position.

3. The screw-in filter according to claim 1, wherein, The top surface of the spring-loaded extension is concave along at least a portion of its radial length in the expanded position.

4. The screw-in filter according to any one of claims 1-3, wherein, The end plate defines the end plate through hole, the nut plate defines the nut plate through hole, and the center body of the washer defines the washer through hole, wherein the end plate through hole, the nut plate through hole, and the washer through hole are axially aligned with each other.

5. The screw-in filter according to claim 4, wherein, At least a portion of the lower part of the central body extends into the end plate through hole, and at least a portion of the upper part of the central body extends into the nut plate through hole.

6. The spiral-in filter according to claim 4, wherein, The nut plate through-hole and the washer through-hole at least partially receive the post, wherein the central body of the washer forms a third seal with the post, wherein the third seal is maintained when the spring-loaded extension moves between the expanded position and the compressed position.

7. The swirl-in filter according to any one of claims 1-3 and 5-6, wherein, The washer extends further axially in the expanded position than in the compressed position.

8. The swirl-in filter according to any one of claims 1-3 and 5-6, wherein, The spring-loaded extension includes a flexible portion extending radially from the central body and a circumferential lip extending radially from the flexible portion.

9. The spiral-in filter according to claim 8, wherein, In the expanded position, the end of the circumferential lip extends axially below the flexible portion, and In the compressed position, the end of the circumferential lip is substantially radially aligned with the flexible portion.

10. The spiral-in filter according to claim 8, wherein, The connection between the central body and the spring-loaded extension is tapered, such that the thickness of the flexible portion gradually decreases as the flexible portion extends radially outward from the central body to the center of the flexible portion.

11. The spiral-in filter according to claim 8, wherein, The circumferential lip can be positioned in an axially extended position and a radially extended position. In the axially extended position, the end of the circumferential lip is axially located below the flexible portion. In the radially extended position, the end of the circumferential lip is substantially radially aligned with the flexible portion.

12. The spiral-in filter according to claim 1, wherein, The central body is at least partially located within a through-hole in the end plate defined by the inner surface of the end plate. The central body includes at least one rib along the outer surface of the central body, wherein the at least one rib forms a gap between the outer surface of the central body and the inner surface of the end plate.

13. The spiral-in filter according to claim 12, wherein, A channel is defined between the bottom surface of the spring-loaded extension, the outer surface of the central body, and the top surface of the end plate, wherein the gap is fluidly connected to the channel.

14. The swirl-in filter according to any one of claims 1-3, 5-6 and 9-13, wherein, The washer is a single, integral component.

15. The swirl-in filter according to any one of claims 1-3, 6 and 12-13, wherein, The upper portion of the central body is tapered, such that the thickness of the central body above the spring-loaded extension in the axial direction is less than the thickness of the central body that is radially aligned with the spring-loaded extension.

16. The swirl-in filter according to any one of claims 1-3, 5-6 and 9-13, wherein, The spring-loaded extension is biased to move from the compressed position to the expanded position.

17. The swirl-in filter according to any one of claims 1-3, 5-6 and 9-13, wherein, As the spring-loaded extension moves between the expanded position and the compressed position, the spring-loaded extension moves relative to the end plate and the nut plate, while the central body remains in substantially the same position relative to the end plate and the nut plate.

18. The swirl-in filter according to any one of claims 1-3, 5-6 and 9-13, wherein, The axial height of the washer is smaller in the compressed position than in the expanded position, and the radial width of the washer is larger in the compressed position than in the expanded position.

19. A gasket for a screw-in filter, the gasket comprising: The main body, and A spring-loaded extension circumferentially surrounds the central body and extends radially from the central body; the spring-loaded extension is axially flexible between an expanded position and a compressed position. As the spring-loaded extension moves between the expanded position and the compressed position, the spring-loaded extension forms a first seal with and maintains the first seal with the first component of the screw-in filter, and the spring-loaded extension contacts the second component of the screw-in filter. When the spring-loaded extension moves between the expanded position and the compressed position, the spring-loaded extension forms a second seal with the second component of the spiral filter and maintains the second seal.

20. The washer according to claim 19, wherein, The bottom and top surfaces of the spring-loaded extension are concave at least a portion of their respective radial lengths in the expanded position.

21. The washer according to claim 19 or 20, wherein, The spring-loaded extension includes a flexible portion extending radially from the central body and a circumferential lip extending radially from the flexible portion.

Images