Air cleaner with water separation function

Abstract

A fluid filtration system includes a shell-like housing having a first cavity and a second cavity, the first cavity being upstream of the second cavity. The fluid filtration system also includes a housing closure configured to form a sealed engagement with the shell-like housing. The fluid filtration system also includes a filter element removably coupled to the shell-like housing and positioned within the second cavity. The filter element includes a first end cap, a second end cap, a media pack extending between and coupled to both the first end cap and the second end cap, and a hydrophobic mesh coupled to the second end cap. The hydrophobic mesh is configured to prevent moisture from passing out of the filter element and downstream of the filter element.

Description

[0001] Cross-referencing of related patent applications This application claims the benefit and priority of Indian Provisional Patent Application No. 202041043381, filed on October 6, 2020, and Indian Provisional Patent Application No. 202041054207, filed on December 14, 2020. The contents of these applications are incorporated herein by reference in their entirety. Technical Field

[0002] This disclosure generally relates to fluid filtration systems. More specifically, this disclosure relates to air filtration systems operating in humid environments. Background Technology

[0003] An air filtration system is used to filter particulate matter (e.g., dirt, oil, and / or contaminants) from an incoming airflow and supply the filtered air to an internal combustion engine. The filtration system may include a filter assembly (e.g., an air filter, etc.) comprising a removable filter element made of pleated and / or corrugated media. The filter assembly may be located at various locations on or within the vehicle body (e.g., chassis). In some embodiments, the filter assembly may be positioned near the wheel wells or at another location where water can easily be drawn in along the vehicle body. In these cases, the filter assembly may be exposed to water in rainy conditions or when streets are flooded, which can contaminate the fresh airflow and increase the risk of water being drawn into the engine. These problems are exacerbated in configurations that do not include a pre-cleaner or water separator upstream of the filter assembly (e.g., within other parts of the intake system). Pre-cleaners and water separators also increase limitations on the air filtration system, which can reduce engine performance. Summary of the Invention

[0004] At least one embodiment of this disclosure relates to a filter assembly. The filter assembly includes a housing and a filter element. The housing includes a housing body and a service cover. The housing body defines an internal volume, an inlet port, and an outlet port. The service cover is movable relative to the housing body to provide access to the internal volume. The service cover includes a water collection sump, which is at least partially axially aligned with the inlet port when the service cover is mounted on the housing body. The filter element is removably coupled to the housing body and disposed within the internal volume.

[0005] In one embodiment, the water collection tank includes a partition defining a recessed area, a portion of which defines a ramp.

[0006] In one embodiment, the partition separates the water collection tank from the area of ​​the maintenance cover that is axially aligned with the filter element.

[0007] In one embodiment, the water collection tank includes a plurality of baffles disposed in the recessed area, the plurality of baffles extending away from the lower wall in a substantially perpendicular orientation relative to the lower wall of the maintenance cover.

[0008] In one embodiment, the housing body includes an inlet pipe extending from the inlet port toward the maintenance cover.

[0009] In one embodiment, the housing body further includes a flared opening disposed at the outlet end of the inlet pipe.

[0010] In one embodiment, the inlet pipe is a diffuser-shaped inlet pipe, wherein the inner diameter of the diffuser-shaped inlet pipe at the outlet end of the diffuser inlet pipe is larger than the inner diameter at the inlet end of the diffuser inlet pipe.

[0011] In one embodiment, the water collection tank includes a partition defining a recessed area, the partition extending at least partially laterally from a first lateral end of the maintenance cover toward a second lateral end of the maintenance cover in a portion of the partition aligned with the inlet pipe.

[0012] In one embodiment, the water collection tank is movable relative to other parts of the maintenance cover.

[0013] In one embodiment, the filter assembly further includes a drain valve disposed in the water collection tank.

[0014] In one embodiment, the maintenance cover further includes a drain base plate that is axially aligned with the filter element when the maintenance cover is installed on the housing body, and the filter assembly further includes a drain valve disposed in the drain base plate.

[0015] At least one embodiment relates to a fluid filtration system. The fluid filtration system includes a shell-like housing, a housing closure, and a filter element. The housing closure is configured to form a sealing engagement with the shell-like housing. The housing closure includes a drain opening extending through the housing closure and is configured to selectively facilitate the flow of liquid away from the shell-like housing. The filter element is removably coupled to the shell-like housing and includes a first end cap, a second end cap downstream of the first end cap, a media package, and a hydrophobic mesh. The media package includes filter media extending between the first and second end caps. The hydrophobic mesh is coupled to one of the first and second end caps and is configured to prevent moisture from flowing out of the shell-like housing.

[0016] In one embodiment, the shell-like housing includes a second cavity and a first cavity, the first cavity being located upstream of the second cavity, and the drain opening being in fluid communication with the second cavity.

[0017] In one embodiment, the filter element is positioned within the second cavity, and the hydrophobic mesh is connected to the second end cap.

[0018] In one embodiment, the first cavity has a smaller volume than the second cavity.

[0019] In one embodiment, the drain opening is axially aligned with the inlet of the shell-like housing.

[0020] In one embodiment, the housing closure is rotatably coupled to the shell-like housing, the housing closure including a partition that defines a recessed area aligned with the filter element when the filter element is positioned within the shell-like housing.

[0021] Another embodiment relates to a filter element. The filter element includes a media package, a first end cap, a second end cap, and a hydrophobic mesh. The media package defines a first end and a second end. The first end cap is coupled to the first end, and the second end cap is coupled to the second end such that the second end cap is downstream of the first end. The second end cap includes a sealing member configured to form a sealing engagement with a shell-like housing. The filter element also includes a hydrophobic mesh extending across the second end and configured to prevent water from flowing downstream of the media package.

[0022] Another embodiment relates to a filter element comprising: a media package having a first end and a second end; a first end cap coupled to the first end; a second end cap coupled to the second end and positioned downstream of the first end, the second end cap including a sealing member configured to form a sealing engagement with a shell-like housing; and a hydrophobic mesh extending across one of the first end and the second end, the hydrophobic mesh being configured to substantially prevent water from flowing downstream of the media package.

[0023] In one embodiment, the filter element further includes a support structure coupled to one of the first end cap and the second end cap and extending through one of the first end and the second end, the support structure being coupled to the hydrophobic mesh.

[0024] In one embodiment, the hydrophobic mesh is attached to the second end cap such that the hydrophobic mesh substantially prevents water from entering the medium package.

[0025] This overview is illustrative only and should not be considered restrictive. Attached Figure Description

[0026] This disclosure will be more fully understood from the following detailed description, taken in conjunction with the accompanying drawings, wherein similar reference numerals denote similar elements, in which: Figure 1 This is a perspective view of an example fluid filtration system.

[0027] Figure 2 yes Figure 1 A perspective cross-sectional view of a fluid filtration system.

[0028] Figure 3 It is used in fluid filtration systems (e.g.) Figure 1 A perspective view of a filter element in a fluid filtration system.

[0029] Figure 4 yes Figure 3 A side cross-sectional view of the filter element.

[0030] Figure 5 yes Figure 1 A top view of the filter element.

[0031] Figure 6 This is a perspective view of another example filter component.

[0032] Figure 7 yes Figure 6 A partial perspective view of the filter component.

[0033] Figure 8 This is a side cross-sectional view of a filter assembly according to another embodiment.

[0034] Figure 9 This is a side cross-sectional view of a filter assembly according to another embodiment.

[0035] Figure 10 It is used for Figure 9 Top perspective view of the maintenance cover of the filter assembly.

[0036] Figure 11 This is a side cross-sectional view of a filter assembly according to another embodiment.

[0037] Figure 12 This is a side cross-sectional view of a filter assembly according to another embodiment.

[0038] Figure 13 This is a top perspective view of a maintenance cover for a filter assembly according to another embodiment.

[0039] Figure 14 This is a top perspective view of a service cover for a filter assembly according to yet another embodiment.

[0040] Reference is made to the accompanying drawings throughout the detailed description below. In the drawings, similar symbols generally identify similar parts unless the context otherwise indicates. The illustrative embodiments described in the detailed description, drawings, and claims are not intended to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that, as generally described herein and shown in the drawings, aspects of this disclosure can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are expressly contemplated and form part of this disclosure. Detailed Implementation

[0041] The embodiments described herein generally relate to air filter assemblies for internal combustion engine systems. Since the described concepts are not limited to any particular implementation, the various concepts introduced above and discussed in more detail below can be implemented in any of a variety of ways. Examples of specific implementation methods and applications are provided primarily for illustrative purposes.

[0042] This application generally relates to systems for separating and removing water within a filter assembly. In particular, this application relates to a filter assembly including a water collection trough integrally formed into a service cover of the filter assembly. The filter assembly includes a two-piece housing having a housing body and a service cover. The housing body defines an enclosed internal volume of the housing and inlet and outlet ports fluidly connected to the internal volume. When the service cover is mounted on the housing body, a portion of the water collection trough is positioned below (axially aligned with) the inlet port. Fresh air entering through the inlet port is directed to the water collection trough, which facilitates the removal of water from the incoming airflow by inertial separation. Among other benefits, the water collection trough allows for the separation and removal of water within the filter assembly, which essentially eliminates the need for additional pre-separation devices upstream of the inlet port, such as vortex tubes, vents, and / or louvered pre-cleansers.

[0043] Before turning to the accompanying drawings, which illustrate certain exemplary embodiments in detail, it should be understood that this disclosure is not limited to the details or methods set forth in the specification or shown in the drawings. It should also be understood that the terminology used herein is for descriptive purposes only and should not be considered limiting.

[0044] Figure 1 This is a perspective view showing a first example fluid filtration system, system 100. System 100 can be used to filter fluids supplied to an internal combustion engine. The fluid can be, for example, air or a similar gaseous substance. System 100 can be mounted to a vehicle chassis. In other embodiments, system 100 is configured for mounting to an engine.

[0045] like Figure 1 As shown, system 100 includes a shell-like housing (e.g., a housing body) 200 and a housing closure (e.g., a service cover) 202. The housing closure 202 is removably attached to the shell-like housing 200, allowing an operator to remove the housing closure 202 to service the interior of the shell-like housing 200. The housing closure 202 can be attached to the shell-like housing 200 using a latch, fastener, adhesive, or the like.

[0046] The shell-shaped housing 200 includes an inlet 204 and an outlet 206. The inlet 204 is located upstream of the outlet 206. The inlet 204 directly or indirectly supplies fluid to the engine. The outlet 206 discharges the filtered fluid.

[0047] Now refer to Figure 2 The diagram shows a cross-sectional view of system 100. System 100 includes a first cavity 210 and a second cavity 212, the second cavity 212 being in fluid communication with the first cavity 210. The first cavity 210 includes an inlet 204, and the second cavity 212 includes an outlet 206. In some embodiments, the outlet 206 delivers filtered fluid directly or indirectly to an engine. The second cavity 212 is located downstream of the first cavity 210. A shell-like housing 200 may be formed from a single body including both the first cavity 210 and the second cavity 212, the shell-like housing 200 being formed by casting, milling, die casting, additive manufacturing, etc. A housing closure 202 forms a hermetically sealed engagement with the shell-like housing 200, such that a substantially watertight seal and / or an airtight seal is formed between the shell-like housing 200 and the housing closure 202. The housing closure 202 may include a drain opening 213 (e.g., an opening, orifice, valve, etc.) extending through the housing closure 202 and configured to allow fluid flow away from the shell housing 200. In some embodiments, the drain opening 213 is a one-way valve configured to prevent fluid flow into the shell housing 200 via the drain opening 213, but configured to allow fluid or liquid (e.g., moisture, condensate, water, water vapor, etc.) to flow away from the shell housing 200. The drain opening 213 is in fluid communication with the second cavity 212. The housing closure 202 may also include a second drain opening 215 in fluid communication with the first cavity 210.

[0048] The second cavity 212 defines a second cavity inlet 214 and a second cavity outlet 216. The second cavity outlet 216 is in fluid communication with the outlet 206. The second cavity inlet 214 is located upstream of the second cavity outlet 216. The second cavity 212 causes fluid to flow from the second cavity inlet 214 to the second cavity outlet 216. The second cavity 212 may define a substantially cylindrical cross-section configured to receive a substantially cylindrical filter element. In some embodiments, the second cavity 212 defines a racetrack-shaped cross-section (e.g., two semicircles separated by a straight line) and is configured to receive a filter element having a racetrack-shaped cross-section. In some embodiments, the second cavity 212 defines a substantially oval cross-section and is configured to receive a filter element having a substantially oval cross-section.

[0049] The filter element 220 is removably positioned within the second cavity 212. In some embodiments, the filter element 220 is removably coupled to the housing 200, for example by fasteners, latches, or friction, such that the filter element 220 can be removed from the housing 200 and replaced by a new filter element.

[0050] A filter element 220 is disposed within a second cavity 212 of the shell-like housing 200, such that a central longitudinal axis 224 of the second cavity 212 extends through the filter element 220. The filter element 220 may be cylindrical in shape and may include a cylindrical media package 226 wound around an element core 228. In some embodiments, the cross-section of the filter element 220 may define a substantially circular, racetrack-shaped, oblong (e.g., two curved ends connected by two straight ends), elliptical, or similar shape. In some embodiments, the cross-section of the media package 226 defines a substantially circular, racetrack-shaped, oblong, elliptical, or similar shape. The cross-sectional shape of the element core 228 may affect the cross-section of the media package. For example, if the element core 228 defines an elliptical cross-section, the media package 226 may define a similar elliptical cross-section. The media package 226 includes a filter medium configured to filter particulate matter from a fluid flowing through it, thereby producing a filtered fluid (e.g., a cleaning fluid). The filter media may be pleated or formed into another desired shape to increase the flow area through the media package 226 or otherwise alter the particle removal efficiency of the filter element 220. According to one embodiment, the media package 226 may include various types of filter media, including but not limited to pleated media, corrugated media, tetrahedral media, or variations thereof (e.g., any filter media disclosed in PCT application PCT / US 2019 / 065259, the entire contents of which are incorporated herein by reference). U.S. Patent No. 8,397,920, entitled “PLEATED FILTER ELEMENT WITH TAPERING BEND LINES,” filed October 14, 2011, and published March 19, 2013, and assigned to Cummins Filtering IP Inc., describes tetrahedral filter media that the media package 226 may include, which is incorporated herein by reference in its entirety and for all purposes. Some configurations of tetrahedral filter media may include multiple inlet tetrahedral flow channels and multiple outlet tetrahedral flow channels. The inlet tetrahedra are fused to the central portion of the tetrahedral filter media, allowing air to flow axially across the inlet tetrahedral channels before passing through the filter media. This arrangement provides additional dust load on the upstream side of the media, increasing its filtration capacity. In some embodiments, the filter media includes porous materials with predetermined pore sizes, paper-based filter media, fiber-based filter media, foam-based filter media, etc. Filter element 220 may be arranged as an axial-flow filter element having a dirty side 230 and a clean side 232. The dirty side 230 is located upstream of the clean side 232.Specifically, the filter element 220 is configured to filter fluid flowing axially from the dirty side 230 through the filter element 220 to the clean side 232.

[0051] Reference Figure 3 The image shows a perspective view of a filter element 220. The filter element 220 includes a first end 240 (e.g., a dirty end) and a second end 242 (e.g., a clean end). A first end cap 245 is coupled to the first end 240, and a second end cap 249 is coupled to the second end 242. In some embodiments, both the first end cap 245 and the second end cap 249 are open end caps. In some embodiments, one of the first end cap 245 and the second end cap 249 is a closed end cap. Media package 226 (e.g.) Figure 5 As shown, the filter element 220 extends between the first end 240 and the second end 242. In some embodiments, the media package 226 is surrounded by a housing 227 (e.g., a shell, enclosure, exoskeleton, etc.). The housing 227 extends between the first end 240 and the second end 242 and protects the media package 226 from damage. In some embodiments, the housing 227 is encapsulated within a first end cap 245 and a second end cap 249. A sealing member 244 is coupled to the filter element 220 adjacent to the second end 242. The sealing member 244 is configured to form a sealing engagement with the shell-like housing 200. The sealing member 244 extends around the periphery of the second end 242 (e.g., circumferentially around the second end 242) and defines a generally annular body. In some embodiments, the sealing member 244 is coupled to the second end cap 249, and the second end cap 249 is coupled to the media package 226 adjacent to the second end 242. In some embodiments, the sealing member 244 is positioned against the inner surface of the shell-like housing 200 to form a radial seal. In some embodiments, the sealing member 244 is positioned against the shell housing 200 to form an axial seal. For example, when the housing closure 202 is attached to the shell housing 200, a portion of the housing closure 202 may engage with a portion of the filter element 220 (e.g., a first end cap 245). The interaction between the housing closure 202 and the filter element 220 may compress the filter element 220 against internal features of the shell housing 200 (e.g., inner surfaces, flanges, etc.), and thus compress the sealing member 244 to form either an axial seal or a radial seal.

[0052] Filter element 220 also includes a hydrophobic mesh 246 positioned on (e.g., around, above, etc.) the second end 242. The hydrophobic mesh 246 is configured to resist or prevent moisture (e.g., water) and debris from passing through the media package 226, while allowing air and other gaseous elements to pass through. In other words, the hydrophobic mesh 246 prevents or blocks moisture from passing downstream of the filter element 220. In some embodiments, the hydrophobic mesh 246 is formed of a polymer woven mesh with an optional surface coating. In some embodiments, the hydrophobic mesh 246 is a polymer mesh fabric. In some embodiments, the hydrophobic mesh 246 is a woven fabric. For example, the hydrophobic mesh 246 can be woven in various patterns (e.g., satin weave, sateen weave, dobby weave, and bi-directional weave). In some embodiments, the hydrophobic mesh 246 is a non-woven fabric. In some embodiments, the hydrophobic mesh 246 is formed from a textile such as cotton, wool, and nylon and treated with a hydrophobic surface treatment. In some embodiments, the hydrophobic mesh 246 is formed from polymer yarns (e.g., high-density polyethylene, low-density polyethylene, nylon, polyester, etc.) and woven into a fabric. The polymer yarns may be monofilaments. In some embodiments, the hydrophobic mesh 246 is formed from a woven stainless steel mesh with a hydrophobic coating (e.g., a polytetrafluoroethylene (PTFE, Teflon™) coating). In some embodiments, the hydrophobic mesh 246 is a screen, such as an extruded screen or extruded mesh. The hydrophobic mesh 246 can be formed by perforating the material to form a desired pore structure. In some embodiments, the hydrophobic mesh 246 is formed by perforating the material and then expanding (e.g., stretching) the material to form the desired pore size. In some embodiments, the hydrophobic mesh 246 covers the entire second end 242. The hydrophobic mesh 246 may be coupled to a sealing member 244.

[0053] In some embodiments, the filter element 220 includes a support structure 248 (in Figure 3The support structure 248, which is arranged in a grid pattern, extends across the second end 242 and is positioned between the hydrophobic mesh 246 and the media package 226. The support structure 248 may be formed of plastic, metal, wood, polymer, or similar materials. The support structure 248 is formed of thin structures extending perpendicularly to each other, thus forming a lattice structure (e.g., an open frame formed of strips of material in a cross pattern). In some embodiments, the support structure 248 is formed of thin structures extending radially away from the central longitudinal axis 224 and toward the periphery of the end cap 245. In some embodiments, the support structure 248 defines a broken rib pattern, allowing fluid to move laterally between the broken rib patterns. For example, the thin structure defining the support structure 248 may include holes that allow fluid to pass laterally (e.g., in a direction substantially perpendicular to the central longitudinal axis 224). In some embodiments, the hydrophobic mesh 246 is coupled to the support structure 248. The support structure 248 is configured to allow fluid, air, and debris to pass through.

[0054] In some embodiments, the first end 240 includes a support structure 250 similar to support structure 248 (also in the form of a mesh in certain embodiments). The first end 240 also includes a first end cap 245 similar to a second end cap 249. Support structure 250 can be attached to the first end 240 using fasteners, adhesives, etc. In some embodiments, a hydrophobic mesh (e.g., hydrophobic mesh 246) is attached to both the first end 240 and the second end 242. In some embodiments, hydrophobic mesh 246 is attached to the first end 240 but not to the second end 242.

[0055] In some embodiments, system 100 includes a secondary filter element located downstream of filter element 220. The secondary filter element may include a hydrophobic mesh 246 located on one or both of the dirty and clean sides. In some embodiments, system 100 includes a tertiary filter element positioned upstream of filter element 220. The tertiary filter element may include a hydrophobic mesh 246 located on one or both of the dirty and clean sides. In some embodiments, such as in the case of having an inside-out filter and an outside-in filter, the hydrophobic mesh 246 is circumferentially wound around media package 226 and encapsulated in a first end cap 245 and a second end cap 249.

[0056] Now refer to Figure 5The diagram shows a top view of the second end 242 of the filter element 220. The filter element 220 is shown having a substantially racetrack-shaped cross-section. Similarly, a hydrophobic mesh 246 defines a substantially racetrack-shaped surface area. The periphery of the hydrophobic mesh 246 is coupled to a sealing member 244. A support structure 248 is disposed between the hydrophobic mesh 246 and the media package 226. The support structure 248 includes a narrow support member extending from a first point of the sealing member 244 to a second point of the sealing member 244. The hydrophobic mesh 246 may be coupled to the support structure 248 and to a plurality of points 252 surrounding the support structure 248. In some embodiments, the hydrophobic mesh 246 is coupled to the media package 226 and not to the sealing member 244. In some embodiments, the hydrophobic mesh 246 is disposed between the media package 226 and the support structure 248, and the hydrophobic mesh 246 is coupled to the media package 226. In some embodiments, the hydrophobic mesh 246 is coupled to a housing 227 near the second end 242. In some embodiments, when the filter element 220 is positioned within the shell housing 200, the hydrophobic mesh 246 is separate from the filter element 220 and positioned downstream of the filter element 220. In some embodiments, the hydrophobic mesh 246 is coupled to the shell housing 200 downstream of the filter element 220.

[0057] In some embodiments, the cross-sectional shape of the media package 226 differs from the cross-sectional shape of the sealing member 244. For example, the media package 226 may define a cross-section with a racetrack-shaped shape, while the sealing member 244 may define a cross-section with an elliptical shape (e.g., Figure 3 (As shown). Similarly, in some embodiments, the media package 226 may define a cross-section having an elongated oval shape, while the sealing member 244 may define a cross-section having a racetrack-shaped shape. Each of the sealing member 244, end cap 245, housing 227, media package 226, hydrophobic mesh 246, and end cap 249 may define a different cross-sectional shape. In some embodiments, the second cavity 212 defines a different cross-sectional shape between the second cavity inlet 214 and the second cavity outlet 216. Similarly, the filter element 220 may define a different cross-sectional shape between the first end 240 and the second end 242.

[0058] Now refer to Figure 6 and Figure 7The image illustrates a filter assembly 300 according to another exemplary embodiment. The filter assembly 300 includes a housing 400 (e.g., a shell, etc.) comprising a housing body 402 and a service cover 404. The housing body 402 defines an internal volume 406 sized to receive a replaceable air filter element 500 therein. The housing body 402 also defines an inlet port 408 and an outlet port 410 fluidly coupled to the internal volume 406 to guide airflow into and out of the internal volume 406, respectively. The inlet port 408 and the outlet port 410 are both located on the upper end of the housing body 402 and are axially offset from each other. The service cover 404 is movable relative to the housing body 402 to provide access to the internal volume 406. In one embodiment, the service cover 404 is hinged (e.g., rotatably) coupled to the housing body 402 and can rotate between an open position (where a user can access the internal volume 406 through an opening in the housing body 402) and a closed position (which prevents access to the internal volume 406). In another embodiment, the service cover 404 is removably (e.g., detachably) coupled to the housing body 402 and can be separated from the housing body 402 to provide access to the internal volume 406. The service cover 404 can be secured to the housing body 402 in a closed (e.g., mounted) position using clips, latches, or other suitable fasteners.

[0059] like Figure 7As shown, the filter element 500 is removably mounted to the housing body 402 near the outlet port 410. In one embodiment, the filter element 500 is hermetically engaged with the housing body 402 near the outlet port 410. The filter element 500 includes a media pack 502, a first (e.g., upper) end cap 504, and a second (e.g., lower) end cap 506. The first end cap 504 is coupled to the media pack 502 at its upper end. The second end cap 506 is coupled to the media pack 502 at its lower end (e.g., at the axial end of the media pack 502 opposite to the first end cap 504). The first end cap 504 and the second end cap 506 may serve as a frame that supports the media pack 502 and ensures a seal between the filter element 500 and the housing body 402. The first end cap 504 and the second end cap 506 may be formed of plastic (e.g., hard polyurethane), metal, or another suitable material. Media pack 502 may include any fibrous or porous media for removing solid particles from an incoming airflow. The media may include paper-based filter media, fiber-based filter media, foam-based filter media, etc. In one embodiment, media pack 502 includes a pleated filter media. For example, media pack 502 may be defined by a plurality of interdigitated tetrahedral forms extending from upstream and downstream ends of media pack 502. Examples of tetrahedral forms are described in detail in International Patent Publication No. PCT / US2019 / 039876, filed June 28, 2019, and U.S. Patent No. 8,397,920, filed October 14, 2011, the entire disclosure of which is incorporated herein by reference. In embodiments, media pack 502 may include another form of pleated media or pleated media shape.

[0060] The maintenance cover 404 is connected to an opening at the lower end of the housing body 402 opposite to the upper end. Together, the housing body 402 and the maintenance cover 404 substantially enclose the internal volume 406. Figure 7 As shown, the service cover 404 defines a protrusion extending from the inner surface of the service cover 404 into the internal volume 406. The protrusion includes a ramp 412 extending along the sidewall of the protrusion toward the inner surface of the service cover 404. The ramp 412 may be a rounded corner (e.g., a chamfer) along the lower edge of the protrusion. The radius of the rounded corner may be approximately equal to the height of the protrusion. In other embodiments, the radius of the rounded corner may be different. Among other benefits, the ramp 412 also facilitates airflow from the inlet port 408 into the substantially axial direction of the internal volume 406 (e.g., as shown in the image). Figure 7The vertical direction (as shown) transitions to a horizontal direction spanning the internal volume 406 between the inlet port 408 and the outlet port 410. In some embodiments, the ramp 412 can reduce pressure loss on the filter assembly by approximately 8% or more. Figure 7 As shown, the service cover 404 also includes a plurality of support members extending upward from the inner surface of the service cover 404 toward the filter element 500. When the service cover 404 is mounted onto the housing body 402, the upper end of each support member contacts the lower end of the filter element 500 to support the filter element in the proper position within the housing 400 and ensure that the filter element remains in a sealing engagement with the housing body 402.

[0061] Now refer to Figure 8 The image shows a filter assembly 600 according to another example embodiment. The filter assembly 600 is similar to... Figure 6 and Figure 7 The filter assembly 300. The difference between filter assembly 600 and filter assembly 300 is that filter assembly 600 includes a water collection trough 714 integrated into a service cover 704. In one embodiment, the service cover 704 is a two-part design, wherein the water collection trough 714 is a separate part connected to a second cover portion (e.g., a flat second cover portion connected to the housing body 702) to form the service cover 704. In another embodiment, the water collection trough 714 is a separately accessible component from the service cover 704. In yet another embodiment, the water collection trough 714 is integrally formed with the service cover 704 such that the water collection trough 714 cannot be separated from the service cover 704. In yet another embodiment, the water collection trough 714 is coupled to a housing body 702 separate from the service cover 704. The water collection trough 714 includes a partition 716 (e.g., a sidewall, peripheral wall, etc.) extending upward from the lower wall (e.g., an inner surface) of the service cover 704 and oriented substantially perpendicularly to the lower wall. The partition 716 defines a recessed area 718 that, when the service cover 704 is mounted onto the housing body 702, is at least partially axially aligned with the inlet port. In other words, the inlet port defines a central axis, and the recessed area 718 intersects this central axis when the service cover 704 is attached to the housing body 702. Figure 8 As shown, the water collection tank 714 is located directly below the inlet port 708 and the pipe (extending upwards from the inlet port 708), allowing water entering from the inlet port 708 (and the pipe) to fall into the water collection tank 714 and separate from the main airflow, thereby reducing overall water intrusion into the clean side of the filter assembly 600. Figure 8In one embodiment, the recessed region 718 is a substantially rectangular cavity. In other embodiments, the shape and / or size of the recessed region 718 may differ. The collection tank 714 also includes a drain (e.g., a port, opening, etc.) disposed along the lower wall of the recessed region 718 and configured to allow separated water to exit the internal volume 706. The drain may include a drain valve (e.g., a check valve, one-way valve, solenoid valve, etc.) to selectively connect the internal volume fluid to the environment surrounding the filter assembly 600. Figure 8 As shown, a portion 720 of the baffle 716 separates the water collection tank 714 from the area of ​​the maintenance cover 704 that is axially aligned with the filter element 500. This portion 720 of the baffle 716 may also define a ramp 712, as shown in the reference. Figure 6 and Figure 7 As described.

[0062] like Figure 8 As shown, the air entering the internal volume 706 axially from the inlet port 708 (e.g., as...) Figure 8 The air moves downwards (vertically) toward the water collection tank 714, then transitions to a lateral direction toward the filter element 500. Because water has higher inertia than air (inertial separation), it separates from the main airflow. The separated water is collected in the water collection tank 714.

[0063] refer to Figure 8 The design and arrangement of the described components should not be considered limiting. Many alternatives and combinations are possible without departing from the inventive concept disclosed herein. For example, Figures 9-13 Examples of different structures that can be used for maintenance covers (e.g., housing closure 202; maintenance covers 404, 704) and housing bodies (e.g., shell-like housing 200; housing bodies 402, 702) are shown. Figure 9 and Figure 10 A housing body 902 is shown, having an inlet pipe 922 extending axially from an inlet port 908 toward a service cover 904. The inlet pipe 922 is disposed within an internal volume 706 of the housing body 902 and axially directs incoming air toward a water collection tank 914 in the service cover 904 to improve the separation of water and incoming air. Figure 10 As shown, the profile of the baffle 916 matches the profile (e.g., shape) of the inlet pipe 922. In other words, the baffle 916 is at least partially lateral (e.g., horizontally, as shown) near the inlet pipe 922 (e.g., along the portion of the baffle 916 aligned with the inlet pipe 922). Figure 9 (As shown) The first lateral end away from the service cover 904 extends toward the second (e.g., opposite) lateral end of the service cover 904.

[0064] like Figure 10As shown, the water collection tank 914 includes a plurality of baffles 924 disposed within the recessed area. The baffles 924 extend away from the lower wall 926 of the service cover 904 with an orientation substantially perpendicular to the lower wall 926. Among other benefits, the baffles 924 also reduce sloshing of any separated water within the recessed area. Water accumulating within the recessed area flows over the baffle 916 to a drain outlet (e.g., port, opening, etc.) disposed below the filter element 500 along the drain base plate 928 of the service cover 904. The drain outlet may include a drain valve (e.g., check valve, one-way valve, solenoid valve, etc.) configured to allow water to drain from the internal volume 706. In other embodiments, the drain outlet may be disposed in the lower wall of the recessed area. Figure 10 As shown, the maintenance cover 904 also includes a plurality of angled ribs 930 extending upward from the drain base plate 928 to further reduce the flow interaction between airflow and water along the drain base plate 928. In various embodiments, the arrangement of the baffle 924 and the ribs 930 may be different.

[0065] Figure 11 A housing configuration is shown, wherein the housing body 1002 includes a bellmouth 1032 disposed at the outlet end of the inlet pipe 1022. Among other benefits, the bellmouth 1032 reduces pressure loss at the transition between the inlet pipe 1022 and the internal volume 706. In other embodiments, the design of the inlet pipe 1022 may differ. For example, Figure 12 A housing body 1102 with a diffuser-shaped inlet pipe 1122 is shown, the inner diameter of which at the outlet end is larger than at the inlet end. The diameter of the inlet pipe 1122 increases continuously from the inlet port 1108 toward the collection tank 1114 to further reduce pressure loss on the inlet pipe 1122 and the filter assemblies 300, 600.

[0066] In various embodiments, the size and / or shape of the water collection tank may also differ. For example, Figure 13 A maintenance cover 1204 is shown, wherein the volume of the water collection tank 1214 is increased by extending a baffle 1216 along a peripheral portion of the drain base plate 1228 (e.g., along the outer edge of the drain base plate in the region of the drain base plate 1228, in the deadflow zones between the outer periphery of the filter element and the sidewall of the housing body, where the main airflow is not affected by the presence of the baffle 1216).

[0067] Figure 14Another example of a maintenance cover 1304 is shown, which includes a plurality of drain outlets (e.g., drain openings, ports, holes, etc.) including a first drain outlet 1319 disposed along the lower wall of a recessed region 1318 in a water collection trough 1314, and a second drain outlet 1321 disposed along a drain base plate 1328 of the maintenance cover 1304 outside the water collection trough 1314. As shown, the first drain outlet 1319 and the second drain outlet 1321 are respectively centrally located along the recessed region 1318 and the drain base plate 1328. In other embodiments, the location, size, and / or number of drain outlets may vary. One or both of the first drain outlet 1319 and the second drain outlet 1321 may also include a drain valve to control the discharge of water from the filter assemblies 300, 600.

[0068] As used herein with respect to numerical ranges, unless otherwise stated, the terms “about,” “approximately,” “substantially,” and similar terms generally mean + / - 10% of the disclosed value. As used herein with respect to structural features (e.g., descriptions of shape, size, orientation, direction, relative position, etc.), the terms “about,” “approximately,” “substantially,” and similar terms are intended to cover minor variations in the structure that may result from, for example, manufacturing or assembly processes, and are intended to have a broad meaning consistent with common and accepted usage by one of ordinary skill in the art to which the subject matter of this disclosure pertains. 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 this disclosure as set forth in the appended claims.

[0069] It should be noted that the term "exemplary" and its variations, as used herein to describe the various embodiments, are intended to indicate possible examples, representations or illustrations of such embodiments (and such terms are not intended to mean that such embodiments must be particular or excellent examples).

[0070] As used herein, the term "connection" and its variations mean that two components are directly or indirectly linked to each other. This connection can be static (e.g., permanent or fixed) or movable (e.g., removable or releasable). Such a connection can be achieved by directly linking the two components to each other, by linking the two components to each other using a single intervening component and any additional intervening components, or by linking the two components to each other using an intervening component that is integrally formed with one of the two components into a single whole. If "connection" or its variations are modified by an additional term (e.g., directly linked), the general definition of "connection" provided above is modified by the simple linguistic meaning of the additional term (e.g., "directly linked" means the connection of two components without any single intervening component), resulting in a narrower definition than the general definition of "connection" provided above. Such a connection can be mechanical, electrical, or fluid.

[0071] References to the location of elements herein (e.g., “top,” “bottom,” “above,” “below”) 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 such variations are intended to be covered by this disclosure.

Claims

1. A filter assembly, comprising: Housing, the housing comprising: - A housing body defining an internal volume, an inlet port, and an outlet port; - A service cover movable relative to the housing body to provide access to the internal volume, the service cover having a water collection channel, wherein the water collection channel includes a partition extending upward from the lower wall of the service cover and defining a recessed area, the recessed area being at least partially axially aligned with the inlet port when the service cover is mounted to the housing body, a portion of the partition opposite the recessed area defining a ramp extending downward along the sidewall of this portion of the partition toward the lower wall of the service cover; and A filter element disposed within the internal volume.

2. The filter assembly according to claim 1, wherein, The ramp portion is the rounded corner along the lower edge of that part of the partition.

3. The filter assembly according to claim 1, wherein, The partition separates the water collection tank from the area of ​​the maintenance cover that is axially aligned with the filter element.

4. The filter assembly according to claim 1, wherein, The water collection tank includes a plurality of baffles disposed in the recessed area, the plurality of baffles extending away from the lower wall in a substantially perpendicular orientation relative to the lower wall of the maintenance cover.

5. The filter assembly according to claim 1, wherein, The housing body includes an inlet pipe extending from the inlet port toward the maintenance cover.

6. The filter assembly of claim 5, wherein, The housing body also includes a flared opening located at the outlet end of the inlet pipe.

7. The filter assembly of claim 5, wherein, The inlet pipe is a diffuser-shaped inlet pipe, and the inner diameter of the diffuser-shaped inlet pipe at the outlet end is larger than the inner diameter at the inlet end.

8. The filter assembly according to claim 5, wherein, The partition extends at least partially laterally away from a first lateral end of the maintenance cover toward a second lateral end of the maintenance cover in a portion of the partition aligned with the inlet pipe.

9. The filter assembly according to any one of claims 1-8, wherein, The water collection tank is movable relative to the other parts of the maintenance cover.

10. The filter assembly according to any one of claims 1-8, further comprising a drain valve disposed in the water collection tank.

11. The filter assembly according to any one of claims 1-8, wherein, The maintenance cover also includes a drainage base plate. When the maintenance cover is installed on the housing body, the drainage base plate is axially aligned with the filter element. The filter assembly also includes a drainage valve disposed in the drainage base plate.

12. The filter assembly according to any one of claims 1-8, wherein, The filter element includes: A medium packet having a first end and a second end; A first end cap, the first end cap being connected to the first end; A second end cap, coupled to the second end and positioned downstream of the first end, includes a sealing member configured to form a sealing engagement with the housing; and A hydrophobic mesh, extending across one of the first and second ends, is configured to substantially prevent water from flowing downstream of the medium package.

13. The filter assembly of claim 12, wherein, The filter element further includes a support structure that is coupled to one of the first end cap and the second end cap and extends through one of the first end and the second end, the support structure being coupled to the hydrophobic mesh.

14. The filter assembly of claim 13, wherein, The hydrophobic mesh is connected to the second end cap, thereby substantially preventing water from entering the medium package.

15. A fluid filtration system, comprising: Shell-like shell; A housing closure configured to form a sealing engagement with a shell-like housing, the housing closure including a drain opening extending through the housing closure and configured to selectively facilitate the outflow of liquid from the shell-like housing, wherein the housing closure has a water collection channel including a partition extending upward from the lower wall of the housing closure and defining a recessed region, a portion of the partition opposite to the recessed region defining a ramp extending downward along the sidewall of that portion of the partition toward the lower wall of the housing closure; A filter element, removably coupled to the housing, the filter element comprising: - First end cap; - A second end cap, located downstream of the first end cap; - A media package comprising filter media, the media package extending between and connected to both the first end cap and the second end cap; and - A hydrophobic mesh, which is connected to one of the first end cap and the second end cap and is configured to prevent water from flowing out of the shell-like housing.

16. The fluid filtration system according to claim 15, wherein: The shell-like housing includes a second cavity and a first cavity. The first cavity is located upstream of the second cavity, and The drainage opening is in fluid communication with the second cavity.

17. The fluid filtration system according to claim 16, wherein, The filter element is positioned within the second cavity, and the hydrophobic mesh is connected to the second end cap.

18. The fluid filtration system according to claim 16, wherein, The first cavity has a smaller volume than the second cavity.

19. The fluid filtration system according to any one of claims 15-18, wherein, The drainage opening is axially aligned with the inlet of the shell-like housing.

20. The fluid filtration system according to any one of claims 15-18, wherein, The housing closure is rotatably connected to the shell-shaped housing, and when the filter element is positioned within the shell-shaped housing, this portion of the partition defines a recessed area aligned with the filter element.

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