Patent Application
20240307801
The present invention relates to filter systems and filter element, in which the filter element includes an end plate having radially extending fluid crossflow channels integrated into the end plate in communication with a bypass valve, the end plate crossflow channels providing fluid bypasss radially through an interior of the end plate.
In view of the technical field disclosed above, at least the following background art of a filter element with a bypass valve is known.
US 2014/0083951 discloses a filter cartridge element having a return valve arranged in an interior of the filter element, having a closure element closing off the valve seat and an opening position in which the closure element enables the passage of fluid through the valve seat, a return member distinct from the filter cartridge, is configured to act by biasing the closure element into the closed position.
US 2014/0262995 discloses a valve assembly of a filter element having a valve plunger with a valve stem and a valve plate connected to the valve stem and designed to close a valve opening. The valve assembly has a spring element with a spring section for generating a restoring force and a holding section for mechanically coupling the spring element to the coupling section of the valve plunger. The valve stem is enclosed at least partially by the spring section. The holding section and the coupling section engage each other such that the spring section generates a restoring force along a center axis of the valve assembly that forces the valve plate against a rim of the valve opening.
US 2016/0332101 discloses a filter cartridge including a filter media, a first end plate including a bypass flow opening, a second end plate, and a spring tube bypass assembly. The spring tube bypass assembly includes a first center tube and a spring. The spring tube bypass assembly is configured such that fluid flow through the bypass flow opening is blocked when a fluid pressure acting on the filter cartridge is below a predetermined pressure and fluid may flow through the bypass filter opening when the fluid pressure acting on the filter cartridge exceeds the predetermined pressure.
Respectfully these and none of the prior art appears to teach a filter element having radially extending fluid crossflow channels formed into an interior of the end plate.
An object of the invention is to provide a filter element is to provide a filter element having radially extending crossflow channels extending radially through an interior of the material of the filter element end plate such that fluid can be bypassed from the inflow side of the filter element to the outflow side of the filter element through end plate crossflow channels without flowing through the filter medium. This is desirable when it becomes necessary to bypass a portion of the fluid to be filtered around the filter medium, for example, when flow is obstructed in the filter medium and/or when a pre-defined pressure drop limit is exceeded.
In aspects of the invention, a filter for filtering a gaseous or liquid fluid is disclosed, having an annular filter medium, surrounding a substantially open interior of the filter medium and defining a longitudinal axis of the annular filter medium. The filter medium has an inflow face preferably at a radially outer side of the annular filter medium receiving unfiltered fluid to be filtered, and an outflow face preferably at a radially inner side of the annular filter medium discharging filter fluid, the outflow face surrounding the substantially open interior.
In aspects of the invention, the end plate is arranged on and covering a first axial end filter element, preferably this is a lower end of the filter element, relative to the direction of gravity. The end plate includes a central flow opening extending axially through the end plate and opening into the substantially open interior of the filter element. At least one radial crossflow channel is provided extending radially through an interior of the material of the end plate from a radially outer side of the end plate and preferably opening into the central flow opening of the end plate. The at least one crossflow channel is positioned and configured to bypass fluid flow through the interior of the material of the end plate from the radially outer side of the end plate into the central flow opening of the end plate where the bypass flow may be controlled by a bypass valve, thereby bypassing fluid flow around the annular filter medium when necessary.
In aspects of the invention, an inlet opening of the at least one radial crossflow channel is arranged at the radially outer side of the end plate and is in fluid communication with the unfiltered fluid to be filtered. An outlet opening of the at least one radial crossflow channel is arranged at the radially inner side of the end plate proximate to or facing the central flow opening of the end plate.
In some aspects of the invention, the filter element further includes a bypass valve assembly arranged in the substantially open interior of the filter element and responsive to changes in fluid pressure drop through the annular filter medium to open or close off bypass flow from the at least one radial crossflow channel of the end plate. The bypass valve assembly includes a valve body arranged to move axially from a first position where the valve body closes off the central flow opening of the end plate, to a second position where the valve body move away from the central flow opening, enabling bypass fluid to flow from the end plate radial cross flow channels and enter the substantially open interior. The valve body further includes a valve housing and a valve spring acting against the valve housing and the valve body, applying a closing force on the valve body to hold the valve body in the first position. In operation, when the fluid pressure drop of the filter element exceeds a predefined limit, the closing force of the spring is overcome by the fluid pressure and the valve body moves freely to the second position, thereby enabling bypass fluid to flow from the end plate radial cross flow channels and enter the substantially open interior of the filter element.
In aspects of the invention, the inlet opening of the at least one radial crossflow channel is arranged at the radially outer side of the end plate and is in fluid communication with the unfiltered fluid to be filtered. The outlet opening of the at least one radial crossflow channel is arranged at the radially inner side of the end plate proximate to the central flow opening and arranged to be controlled by the bypass valve assembly.
In some aspects of the invention, the bypass valve assembly is secured onto or detachably secured onto an interior face of the end plate, preferably arranged within the substantially open interior and positioned to block or enable flow through the central opening of the end plate according to pressure or flow conditions.
In some aspects of the invention, the valve seat is formed by the end plate about an outer circumference of the central flow opening of the end plate such that the valve body closes against the valve seat when in the first position, closing off flow through the central opening.
In aspects of the invention, the valve body or the valve seat includes an elastomeric seal arranged to seal the valve body against the valve seat when the first position.
In some aspects of the invention, the valve housing includes at least one axially extending groove formed in a radially outer side of the valve housing, the at least one axially extending groove forming a portion of a fluid flow path for bypass fluid to flow from the end plate radial cross flow channels, through the at least one axially extending groove and the enter the substantially open interior of the filter element.
In some aspects of the invention, a drain plug member is arranged on and projecting axially outwardly away from an axially outer side of the end plate. Preferably, at least one elastomeric seal is arranged on the drain plug member and adapted to seal against and close off a housing drain opening of the filter housing when the filter element is installed state in the filter housing, and to open the drain opening when the filter element is removed from the installed state.
In some aspects of the invention, the end plate has an upper annular wall, a lower annular wall, and a plurality of radially extending bypass channel separation walls arranged between the upper annular wall and the lower annular wall of the end plate. The plurality of radially extending bypass channel separation walls each connected to at least one of the annular walls of the end plate. The upper annular wall, the lower annular wall and the plurality of radially extending bypass channel separation walls cooperate to define and form the at least one radial crossflow channel within the interior of the end plate and wherein the upper annular wall and the lower annular wall are assembled together to form the end plate.
In further aspects of the invention, the end plate further includes a support tube formed together with the end plate in one piece at a same time as a single unitary component, the support tube having a plurality of flow openings. The support tube is arranged in the substantially open interior of the filter element and positioned to support the annular filter medium at the outflow face.
In preferred aspects of the invention, the end plate is completely formed in one piece in its entirety, preferably of a plastic material by injection molding, all formed together at a same time, as a single unitary one-piece component.
In further aspects of the invention, a filter system is disclosed configured for filtering a gaseous or liquid fluid. The filter system includes a filter housing having an interior chamber configured to receive the filter element discussed in various aspects discusses above, such that when the filter element is installed in the filter housing, unfiltered gaseous or liquid fluid enters the filter element at the inflow face at a radially outer side of the annular filter medium. Filtered gaseous or liquid fluid exits the filter element at the outflow face at the at a radially inner side of the annular filter medium, and into the substantially open interior of the annular filter medium. Wherein the at least one radial crossflow channel of the end plate form at least a portion of a flow path operable for bypassing the gaseous or liquid fluid around the filter medium of the filter element. Wherein the inlet opening of the at least one radial crossflow channel at the radially outer side of the end plate is in fluid communication with the gaseous or liquid fluid and wherein the outlet opening of the at least one radial crossflow channel at the radially inner side of the end plate is arranged facing towards the central flow opening.
In additional aspects of the invention, a bypass valve assembly is arranged in the substantially open interior of the filter element and is responsive to changes in fluid pressure drop through the annular filter medium so as to open or close off bypass flow from the at least one radial crossflow channel of the end plate. The bypass valve assembly including: a valve body arranged to move axially from a first position where the valve body closes off the central flow opening of the end plate, to a second position where the valve body moves away from the central flow opening, enabling bypass fluid to flow from the end plate radial cross flow channels and enter the substantially open interior. A valve housing and a valve spring act against the valve housing and the valve body, applying a closing force onto the valve body to hold the valve body in the first position, wherein when the fluid pressure drop exceeds a predefined limit, the spring closing force is overcome, and the valve body moves to the second position.
In further aspects of the invention, the valve housing includes at least one axially extending groove formed in a radially outer side of the valve housing, the at least one axially extending groove forming a fluid flow path for fluid to flow from the end plate radial cross flow channels, flowing then around the outer side of the valve housing and entering the substantially open interior of the filter element.
In further aspects of the filter system of the invention, the filter housing further includes a housing drain opening formed as a depression in a bottom wall of the filter housing, wherein the at least one elastomeric seal arranged on the drain plug member seals against walls of the housing drain opening depression and closes off a housing drain opening when the filter element is installed state in a filter housing, and opens the drain opening when the filter element is removed from the installed state.
In further aspects of the filter system of the invention, the drain opening depression is an annular groove formed in the bottom wall of the filter housing and surrounding the longitudinal axis, and the drain plug member is annular, configured to seal annularly between the end plate and a bottom wall of the housing so as to separate the inflow side of the filter element from the outflow side, preventing fluid from bypassing the filter medium except through the crossflow channels of the end plate.
Further possible implementations of the invention comprise also combinations, not explicitly mentioned, of features or method steps disclosed above or in the following about the embodiments. In this context, a person of skill in the art will also add individual aspects as improvements or supplements to the respective basic form of the disclosed inventive filter element and filter system.
Further configurations of the invention are subject matter of the dependent claims as well as of the embodiments of the invention described in the following. In the following, the invention will be explained in more detail with the aid of embodiments with reference to the attached figures.
The accompanying Figures, where like reference numerals refer to identical or functionally similar elements throughout the separate views and which together with the detailed description below are incorporated in and form part of the specification, serve to further illustrate various embodiments and to explain various principles and advantages all in accordance with the present invention.
Features of the present invention, which are believed to be novel, are set forth in the drawings and more particularly in the appended claims. The invention, together with the further objects and advantages thereof, may be best understood with reference to the following description, taken in conjunction with the accompanying drawings. The drawings show a form of the invention that is presented as preferred; however, the invention is not limited to the precise arrangement shown in the drawings, but is to be further understood from the disclosure of the specification and the claims.
Skilled artisans will appreciate that elements in the figures are illustrated for clear presentation and to be enabling to the reader and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of embodiments of the present invention, or disclosed portions are omitted in some views to better show critical elements of the invention.
In this document, relational terms such as first and second, top and bottom, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms “comprises,” “comprising,” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by “comprises . . . a” does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.
The filter medium filter media 104 is preferably pleated into a plurality of pleats surrounding the longitudinal axis L, as the pleating provides an substantially increased available filtration area in the filter medium 104, thereby increasing filter life and decreasing pressure drop across the filter medium 104 due to fluid flow through the filter medium 104.
An end plate 122 is connected to lower axial end of the annular filter medium 104, to form the filter element 102. The filter element 102 is configured to filter a gaseous or liquid fluid and is configured for radial flow through the filter medium 104, preferably from the radially outer side or inflow side 126 of the filter element 102, flowing through the filter medium 104 to exit at the radially inner side or outflow side 128 of the filter medium 105.
The annular filter medium 104 surrounds the substantially open interior, defining a longitudinal axis L of the annular filter medium 104 and the filter element 102. The annular filter medium includes an inflow face 126 at a radially outer side of the annular filter medium 104 receiving unfiltered fluid to be filtered from the annular space between the annular filter medium 104 and the radial outer wall of the filter housing 106. The filter medium 104 has an outflow face 128 at a radially inner side of the annular filter medium 104 discharging filtered fluid. The outflow face 128 surrounds the substantially open interior.
The end plate 122 arranged on the lower axial end face of the annular filter medium 104 is disc-shaped, annular and has a central flow opening 150 extending axially through the plate and opening into the substantially open interior. At least one radial crossflow channel 124 extends radially through an interior of the end plate 122, extending from a radially outer side of the end plate 122, through the interior of the end plate 122 and opening into the central flow opening 150 of the end plate 122. The at least one crossflow channel 124 is configured to bypass fluid flow radially through an interior of the end plate 122, thereby bypassing the annular filter medium 104. In general, the bypass through the at least one radial crossflow channel 124 is may be enabled when fluid flow through the filter medium results in a pressure drop across the filter element 102 that exceed a predefined upper limit, as will be discussed further at a later point herein.
The inlet opening of the at least one radial crossflow channel 124 is arranged at the radially outer side of the end plate 122 and is in fluid communication with the unfiltered fluid to be filtered at the radial outer side of the filter element 102. The outlet opening of the at least one radial crossflow channel 124 is arranged at the radially inner side of the end plate proximate to and facing the central flow opening 150 of the end plate 122. As can be understood from
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In the foregoing specification, specific embodiments of the present invention have been described. However, one of ordinary skill in the art appreciates that various modifications and changes can be made without departing from the scope of the present invention as set forth in the claims below. Accordingly, the specification and figures are to be regarded in an illustrative rather than a restrictive sense, and all such modifications are intended to be included within the scope of the present invention. The benefits, advantages, solutions to problems, and any element(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential features or elements of any or all the claims. The invention is defined solely by the appended claims including any amendments made during the pendency of this application and all equivalents of those claims as issued.
