Patent Grant
8714142
This disclosure relates to systems and methods for separating hydrophobic fluids (such as oils) which are entrained as aerosols, from gas streams (for example air streams). Further, the arrangements also provide for filtration of other contaminants such as carbon material, from gas streams. The arrangements are typically used to filter crankcase ventilation gases from engine systems. Methods for conducting the separations are also provided.
Certain gas streams, such as engine blow by gases (i.e. crankcase ventilation gases from the crankcases of diesel engines) carry substantial amounts of entrained oils (liquid) therein, as aerosol. In some instances, many of the oil (liquid) droplets within the aerosol are within the size of 0.1-5.0 microns.
In addition, such gas streams also carry substantial amounts of fine particulate contaminants, such as carbon contaminants. Such contaminants often have an average particle size within the range of about 0.5-3.0 microns.
In some instances, it is desired to vent such gases to the atmosphere. In general, it is preferred that before the gases are vented to the atmosphere, they be cleaned of a substantial portion of aerosol and/or organic particulate containment therein.
In other instances, it is desirable to direct to air gas stream into equipment. When such is the case, it may desirable to separate aerosolized liquids and/or particulates from the stream during circulation, in order to provide such benefits as: reduced negative effects on the downstream equipment; improved efficiency; recapture of otherwise lost oil; and/or to address environmental concerns.
Improvements in crankcase ventilation filter systems (i.e. blow by gas filtration systems) constructed for application with a variety of engine or equipment systems, are generally sought.
Crankcase ventilation filter arrangement is described, as well as components therefor. The crankcase ventilation filter arrangement includes a housing and serviceable filter cartridge. An example housing includes a cover assembly and a base (in an example a bowl), which are removably secured to another, for example with threaded arrangement. The filter cartridge is removably installed with an interior of the housing. In an example depicted, the filter cartridge includes a check valve assembly therein, for protection during vehicle rollover.
Other advantageous features of the filter cartridge are described. Examples include a handle arrangement mounted on one end of the filter cartridge, as well as structural detail to ensure proper fitting of the cartridge within the assembly. Also, methods of assembly are described.
It is noted that there is no requirement that an assembly or component include all of the features described herein, to obtain some advantage according to the present disclosure.
The reference numeral 1,
In general, the housing 2 includes a gas flow inlet tube 10, a liquid drain outlet 11, and a gas flow outlet tube 12. For the example assembly 1 depicted in
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In use, blow by gases (crankcase ventilation gases) are directed into the assembly 1 through inlet tube 10, as shown at arrow 10a. Within the assembly 1, at least of portion of liquid particles (droplets) carried within the crankcase ventilation gases coalesce, and drain outwardly from the assembly 1 through the drain outlet 11, typically at least under gravity influence. The gases are filtered, and the outlet gases leave the assembly 1 through gas flow outlet tube 12, as shown at arrow 12a.
The base 3 is removable from the cover assembly 4. Referring to
After a period of use, the internally cartridge received 5 will typically need to be serviced, for example by refurbishment or replacement. When such as the case: the base or bowl 3 is separated from the cover assembly 4; the cartridge 5 is removed from the assembly 1; and, a new or refurbished cartridge 5 is installed. Herein, a cartridge 5 which is removable and replaceable within the housing 2 is generally referred as a “serviceable” cartridge or by similar terms.
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In more general terms, outlet tube 12 includes an outer region 12x,
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It is noted that in a typical use, a drain tube will be attached to outlet 11. The drain tube can be provided with a valve therein, to ensure the liquid won't flow back from the line into the assembly 1.
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Also typically, support 86 is positioned at least 20% across end piece 71 from an outer periphery 71x to a central aperture therethrough, from each of the central aperture and the outer periphery 71x.
In general, flange 95 and seal 89, separate inlet region 20 (in cover assembly 4), from filtered gas outlet region 30, thus requiring gas flow from inlet tube 10 to pass through media 25 of cartridge 5, before it can pass outwardly from outlet tube 12.
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During normal operation, the valve member 131 is seated against second valve seat 132 as shown. It can also be understood from further description below, that when valve member 131 is seated against second valve seat 132, no seal or closure at region 132a is formed. Thus, liquid within interior region 26 can drain downwardly through aperture 71y into region 80,
It is not required that a complete seal at seat 135 be formed to obtain some benefit. The end member 134 is snap fit in place, to keep valve member 131 in position. The valve member will typically comprise a hollow spherical (ball) member, as shown, although alternatives are possible.
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A variety of materials can be utilized for the components of assembly 1. Typically molded components will comprise glass filled polyamide, although alternatives are possible. According to
It is noted that under a vehicle rollover condition, in which the valve member 131 seats against seat 135, pressure within the assembly 1 will, increase, and pressure relieve assembly 40 will open.
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Of course, the off gases 252 can be directed elsewhere, for example into air cleaner 260, if desired.
In general, the system 250 depicted is “closed” in that filtered off gases from the filter arrangement 1 are not vented directed to the atmosphere, but rather are cycled back into the engine intake, indicated generally at 270.
The appropriate media, for the media pack, is selected for the conditions of use. Generally the media is selected to have appropriate properties with respect to: coalescing and drainage of liquid; and, filtering of gases passing therethrough with respect to particulates. Layers of media can be utilized for the media of the media pack. Example usable media is described in U.S. Provisional Application Ser. No. 60/731,287, filed Oct. 28, 2005, PCT Application PCT/US2006/041738, filed Oct. 27, 2006, U.S. Provisional Application 60/656,806, filed Feb. 22, 2006; and, PCT Publication WO06/91594, published Aug. 31, 2006, and PCT Publication WO 2006/084282, published Oct. 19, 2006, each of which is incorporated herein by reference.
Typically the media will comprise a continuous, non-woven, fibrous media.
An example useable media as described in U.S. provisional application 60/656,806 filed Feb. 22, 2005, incorporated herein by reference. Another example media is described in PCT Publication WO 05/083,240, published Sep. 9, 2005, and incorporated herein by reference. A third example media is described in U.S. provisional application 60/650,051 filed Feb. 4, 2005, incorporated herein by reference. The following description is of example media from U.S. provisional application 60/650,051, filed Feb. 4, 2005.
The media is typically a wet laid media is formed in a sheet form using wet laid processing, and is then positioned on/in the filter cartridge. Typically the wet laid media sheet is at least used as a media stage stacked in multiple layers.
As indicated, multiple layers, forming a gradient can be provided in a media stage, by first applying one or marc layers of wet laid media of first type and then applying one or marc layers of a media (typically a wet laid media) of a different, second, type. Typically when a gradient is provided, the gradient involves use of two or marc media types which are selected for at least differences in efficiency.
Herein, it is important to distinguish between the definition of the media sheet used to form the media stage, and the definitions of the overall media stage itself. Herein the term “wet laid sheet,” “media sheet” or variants thereof, is used to refer to the sheet material that is used to form the media extension of a filter, as opposed to the overall definition of the total media extension in the filter. This will be apparent from certain of the following descriptions.
Media extensions of the type of primary concern herein, are at least used for coalescing/drainage, although they typically also have particulate removal function and thus comprise a portion of an overall media stage that provides for both coalescing/drainage and desired removal efficiency of solid particulate removal.
Although alternatives are possible, an example media composition used to form a media extension in a CCV (crankcase ventilation) filter for coalescing/drainage is typically as follows:
Media in accord with the general definitions provided herein, including a mix of bi-component (binder) fiber and other fiber, can be used as any (and in some instances all) layer(s) of a media stage in a crankcase ventilation filter as generally described above. When used in this manner, it will typically be placed in multiple layers, although alternatives are possible. The overall efficiency can be calculated based upon the number of layers and the efficiency of each layer. For example the efficiency at 10.5 feet per minute (3.2 m/min) for 0.3 micron DOPE particles for media stage comprising two layers of wet laid media each having an efficiency of 12% would be 22.6%, i.e., 12%+0.12×88.
Typically enough media sheets would be used in the final media stage to provide the media stage with overall efficiency of at least 85%, typically 90% or greater. In some instances it would be preferred to have the efficiency at 95% or marc. In the context the term “final media stage” refers to a stage resulting from wraps or coils of the sheet(s) of the media.
The media extension performs two important functions:
It has been found that for crankcase ventilation filters, a calculated pore size for media used to form media extension within the range of 12 to 50 micron is generally useful. Typically the pore size is within the range of 15 to 45 micron.
The term X-Y pore size and variants thereof when used herein, is meant to refer to the theoretical distance between fibers in a filtration media. X-Y refers to the surface direction versus the Z direction which is the media thickness.
The calculation assumes that all the fibers in the media are lined parallel to the surface of the media, equally spaced, and ordered as a square when viewed in cross-section perpendicular to the length of the fibers. The X-Y pore size is a distance between the fiber surfaces on the opposite corners of the square. If the media is composed of fibers of various diameters, the d2 mean of the fiber is used as the diameter. The d2 mean is the square root of the average of the diameters squared.
It has been found, in some instances, that it is useful to have calculated pore sizes on the higher end of the preferred range, typically 30 to 50 micron, when the media stage at issue has a total vertical height, in the crankcase ventilation filter of less than 7 inches (178 mm); and, pore sizes on the smaller end, about 15 to 30 micron, are sometimes useful when the filter cartridge has a height on the larger end, typically 7-12 inches (178-305 mm). A reason for this is that taller filter stages provide for a higher liquid head, during coalescing, which can force coalesced liquid flow, under gravity, downwardly through smaller pores, during drainage. The smaller pores, of course, allow for higher efficiency and fewer layers.
Of course in a typical operation in which the same media stage is being constructed for use in a variety of filter sizes, typically for at least a portion of the wet laid media used for the coalescing/drainage in initial separation, an average pore size of about 30-50 microns will be useful.
Solidity is the volume fraction of media occupied by the fibers. It is the ratio of the fibers volume per unit mass divided by the media's volume per unit mass.
Typical materials preferred for use in media extension according to the present disclosure, have a percent solidity at 0.125 psi (8.6 milliards) of fewer than 10%, and typically fewer than 8%, for example 6-7%.
The preferred efficiency stated, is desirable for layers or sheets of media to be used to generate crankcase ventilation filters. This requirement indicates that a number of layers of the wet laid media will typically be required, in order to generate an overall desirable efficiency for the media stage of typically at least 85% or often 90% or greater, in some instances 95% or greater.
The reason a relatively low efficiency is provided in any given layer, is that it facilitates coalescing and drainage and overall function.
In general, DOPE efficiency is a fractional efficiency of a 0.3 micron DOPE particle (dactyl phthalate) challenging the media at 10 fpm. A TSAR model 3160 Bench (TSAR Incorporated, St. Paul, Minn.) can be used to evaluate this property. Model dispersed particles of DOPE are sized and neutralized prior to challenging the media.
As indicated above, it is preferred that the fiber composition of the media include 30 to 70%, by weight, of bi-component (binder) fiber material. A major advantage of using bi-component fibers in the media, is effective utilization of fiber size while maintaining a relatively low solidity. With the bi-component fibers, this can be achieved while still accomplishing a sufficiently high strength media for handling installation in crankcase ventilation filters. Also, the bi-component fibers are binder fibers.
The bi-component fibers generally comprise two polymeric components formed together, as the fiber. Various combinations of polymers for the bi-component fiber may be useful, but it is important that the first polymer component melt at a temperature lower than the melting temperature of the second polymer component and typically below 205° C. Further, the bi-component fibers are integrally mixed and evenly dispersed with the other fibers, in forming the wet laid media. Melting of the first polymer component of the bi-component fiber is necessary to allow the bi-component fibers to form a tacky skeletal structure, which upon cooling, captures and binds many of the other fibers, as well as other bi-component fibers.
Although alternatives are possible, typically the bi-component fibers will be formed in a sheath core form, with a sheath comprising the lower melting point polymer and the core forming the higher melting point.
In the sheath-core structure, the low melting point (e.g., about 80 to 205° C.) thermoplastic is typically extruded around a fiber of the higher melting point material (e.g., about 120 to 260° C.). In use, the bi-component fibers typically have a average largest cross-sectional dimension (average fiber diameter if round) of about 5 to 50 micrometer often about 10 to 20 micrometer and typically in a fiber form generally have an average length of at least 1 mm, and not greater than 30 mm, usually no marc than 20 mm, typically 1-10 mm. By “largest” in this context, reference is meant to the thickest cross-section dimension of the fibers.
Such fibers can be made from a variety of thermoplastic materials including polyolefin's (such as polyethylene's, polypropylenes), polyesters (such as polyethylene terephthalate, polybutylene terephthalate, PCT), nylons including nylon 6, nylon 6, 6, nylon 6, 12, etc. Any thermoplastic that can have an appropriate melting point can be used in the low melting component of the bi-component fiber while higher melting polymers can be used in the higher melting “core” portion of the fiber. The cross-sectional structure of such fibers can be a “side-by-side” or “sheath-core” structure or other structures that provide the same thermal bonding function. One could also use lobed fibers where the tips have lower melting point polymer. The value of the bi-component fiber is that the relatively low molecular weight resin can melt under sheet, media, or filter forming conditions to act to bind the bi-component fiber, and other fibers present in the sheet, media, or filter making material into a mechanically stable sheet, media, or filter.
Typically, the polymers of the bi-component (core/shell or sheath and side-by-side) fibers are made up of different thermoplastic materials, such as for example, polyolefin/polyester (sheath/core) bi-component fibers whereby the polyolefin, e.g. polyethylene sheath, melts at a temperature lower than the core, e.g. polyester. Typical thermoplastic polymers include polyolefins, e.g. polyethylene, polypropylene, polybutylene, and copolymers thereof, polytetrafluoroethylene, polyesters, e.g. polyethylene terephthalate, polyvinyl acetate, polyvinyl chloride acetate, polyvinyl butyral, acrylic resins, e.g. polyacrylate, and polymethylacrylate, polymethylmethacrylate, polyamides, namely nylon, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl alcohol, polyurethanes, cellulosic resins, namely cellulosic nitrate, cellulosic acetate, cellulosic acetate butyrate, ethyl cellulose, etc., copolymers of any of the above materials, e.g. ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, styrene-butadiene block copolymers, Kraton rubbers and the like. Particularly preferred in the present invention is a bi-component fiber known as 271P available from DuPont. Others fibers include FIT 201, Kuraray N720 and the Nichimen 4080 and similar materials. All of these demonstrate the characteristics of cross-linking the sheath polymer upon completion of first melt. This is important for liquid applications where the application temperature is typically above the sheath melt temperature. If the sheath does not fully crystallize then the sheath polymer will remelt in application and coat or damage downstream equipment and components.
An example of a useable bi-component (binder) fiber for forming wet laid media sheets for use in CCV media is DuPont polyester bi-component 271P, typically cut to a length of about 6 mm.
The bi-component fibers provide a matrix for the crankcase ventilation filter media. The additional fibers or secondary fibers, sufficiently fill the matrix to provide the desirable properties for coalescing and efficiency.
The secondary fibers can be polymeric fibers, glass fibers, metal fibers, ceramic fibers or a mixture of any of these. Typically glass fibers, polymeric fibers or a mixture are used.
Glass fibers useable in filter media of the present invention include glass types known by the designations: A, C, D, E, Zero Boron E, ECR, AR, R, S, S-2, N, and the like, and generally, any glass that can be made into fibers either by drawing processes used for making reinforcement fibers or spinning processes used for making thermal insulation fibers.
Non-woven media of the invention can contain secondary fibers made from a number of both hydrophilic, hydrophobic, oleophilic, and oleophobic fibers. These fibers cooperate with the glass fiber and the bi-component fiber to form a mechanically stable, but strong, permeable filtration media that can withstand the mechanical stress of the passage of fluid materials and can maintain the loading of particulate during use. Secondary fibers are typically monocomponent fibers with average largest cross-sectional dimension (diameters if round) that can range from about 0.1 on up, typically 1 micron or greater, often 8-15 microns and can be made from a variety of materials including naturally occurring cotton, linen, wool, various cellulosic and proteinaceous natural fibers, synthetic fibers including rayon, acrylic, aramide, nylon, polyolefin, polyester fibers. One type of secondary fiber is a binder fiber that cooperates with other components to bind the materials into a sheet. Another type of secondary fiber is a structural fiber that cooperates with other components to increase the tensile and burst strength the materials in dry and wet conditions. Additionally, the binder fiber can include fibers made from such polymers as polyvinyl chloride, polyvinyl alcohol. Secondary fibers can also include inorganic fibers such as carbon/graphite fiber, metal fiber, ceramic fiber and combinations thereof.
The secondary thermoplastic fibers include, but are not limited to, polyester fibers, polyamide fibers, polypropylene fibers, copolyetherester fibers, polyethylene terephthalate fibers, polybutylene terephthalate fibers, polyetherketoneketone (PEKK) fibers, polyetheretherketone (PEEK) fibers, liquid crystalline polymer (LCP) fibers, and mixtures thereof. Polyamide fibers include, but are not limited to, nylon 6, 66, 11, 12, 612, and high temperature “nylons” (such as nylon 46) including cellulosic fibers, polyvinyl acetate, polyvinyl alcohol fibers (including various hydrolysis of polyvinyl alcohol such as 88% hydrolyzed, 95% hydrolyzed, 98% hydrolyzed and 99.5% hydrolyzed polymers), cotton, viscose rayon, thermoplastic such as polyester, polypropylene, polyethylene, etc., polyvinyl acetate, polylactic acid, and other common fiber types.
Mixtures of the fibers can be used, to obtain certain desired efficiencies and other parameters.
The sheet media of the invention are typically made using papermaking processes. Such wet laid processes are particularly useful and many of the fiber components are designed for aqueous dispersion processing. However, the media of the invention can be made by air laid processes that use similar components adapted for air laid processing. The machines used in wet laid sheet making include hand laid sheet equipment, Fourdrinier papermaking machines, cylindrical papermaking machines, inclined papermaking machines, combination papermaking machines and other machines that can take a properly mixed paper, form a layer or layers of the furnish components, remove the fluid aqueous components to form a wet sheet. A fiber slurry containing the materials are typically mixed to form a relatively uniform fiber slurry. The fiber slurry is then subjected to a wet laid papermaking process. Once the slurry is formed into a wet laid sheet, the wet laid sheet can then be dried, cured or otherwise processed to form a dry permeable, but real sheet, media, or filter. For a commercial scale process, the bi-component mats of the invention are generally processed through the use of papermaking-type machines such as commercially available Fourdrinier, wire cylinder, Stevens Former, Roto Former, Inver Former, Venti Former, and inclined Delta Former machines. Preferably, an inclined Delta Former machine is utilized. A bi-component mat of the invention can be prepared by forming pulp and glass fiber slurries and combining the slurries in mixing tanks, for example. The amount of water used in the process may vary depending upon the size of the equipment used. The furnish may be passed into a conventional head box where it is dewatered and deposited onto a moving wire screen where it is dewatered by suction or vacuum to form a non-woven bi-component web.
The binder in the bi-component fibers is activated by passing the matt through a heating step. The resulting material can then be collected in a large roll if desired.
Modification of the surface characters of the fibers, increase in the contact angle, can enhance drainage capability of filtration media and thus the formed elements of the filter (with respect to pressure drop and mass efficiency). A method of modifying the surface of the fibers is to apply a surface treatment such as a flourochemical or silicone containing material, typically up to 5% by weight of the media.
The surface treatment agent can be applied during manufacture of the fibers, during manufacture of the media or after manufacture of the media post-treatment, or after provision of the media pack. Numerous treatment materials are available such as flourochemicals or silicone containing chemicals that increase contact angle. An example is the DuPont Zonyl™ flourochemicals, such as #7040 or #8195.
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An axial projection arrangement 305 is depicted projecting, axially, from end piece 303 in direction away from end piece 302 and media pack 301. The projection arrangement 305 includes a seal arrangement 306 thereon. The seal arrangement 306, for the example cartridge 300 depicted, comprises a radial seal in the form of an o-ring 307 positioned to surround a portion of projection arrangement 305.
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In addition, the projection arrangement 310 includes a framework 317 projecting from the base 311 generally in a direction away from media pack 301 and end piece 303. The framework 317 comprises an upper rail 320 and a support arrangement 321. It is noted that for the particular example cartridge 300 depicted, the upper rail arrangement 320 comprises two spaced arcuate, rail sections 320x, 320y.
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Further, it can be seen that the seal arrangement 306 is positioned on projection 305 spaced from end piece 303. Typically, the distance D1 of this spacing would be at least 14 mm, usually at least 18 mm, and typically within the range of 18-40 mm.
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It is noted that the media pack 301 is depicted schematically in the drawings. The media pack 301 could, for example, comprise a coiled wrap of media as characterized herein.
Cartridge 300 can be used analogously to cartridge 5, in an appropriately configured filter assembly. An example filter assembly for use with cartridge 300, is depicted in
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The particular housing 376 depicted, is configured to receive flow of gases to be filtered from a bottom, as generally shown by arrows 381. Liquid drain is generally shown at arrow 382, and filtered gas (air) exit is shown at arrow 383.
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Assembly 375 also includes a bypass valve assembly 395, for allowing direct gas flow from gas flow inlet to bypass cartridge 300, to reach outlet 391.
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It is noted that valve arrangement, generally in accord with that described herein above in connection with previously described figures, can be adapted for use with the cartridge of
In general terms, according to one aspect of the present disclosure, a crankcase ventilation filter assembly is provided. The assembly includes a housing defining an interior and including a bowl (or housing base) and a cover assembly. The cover assembly, in one example, includes: an air flow outlet tube, including an inner section; an airflow inlet tube; an internal flange; and, an external flange. In one example the air flow outlet tube and the air flow inlet tube are centered on a single line, which extends generally perpendicular to a center line extending through the bowl and cover assembly, such center line typically being a vertical line in installation, see
The bowl (or housing base) typically defines an interior and is releasably secured to the cover assembly. The bowl (or housing base) includes a bottom with a liquid drain surrounded by an internal seal flange.
In more general terms, a crankcase ventilation filter assembly is provided which includes a housing having: an air flow inlet; an air flow outlet; and, a liquid drain outlet.
The assembly further includes a filter cartridge removably positioned within the housing interior. The filter cartridge generally comprises: a media pack surrounding an open filter interior; first and second, opposite, end pieces at opposite ends of the filter media; and, first and second seal members.
In an example shown and described, the first end piece includes a first axial projection thereon, on an opposite side of the first end piece from the media pack and extending away from the second end piece. The first axial projection has a first seal support thereon, with a first seal member mounted on first seal support and positioned for sealing engagement with the internal flange of the cover assembly.
In an example shown, the first axial projection includes a framework extending from the first seal support in a direction away from the media. This framework includes an upper rail or rail arrangement supported by a support arrangement, an example shown comprising spaced supports. The upper rail or rail arrangement is positioned at a location above the lower most portion of the inner section of the outlet tube. In one example, the upper rail or rail arrangement is an upper rail in a single piece, having one gap therein. In a second embodiment, the upper rail or rail arrangement comprises two, arcuate, rail sections separated by two gaps.
Also in an example shown, the second end piece includes a second axial projection thereon, on an opposite side of the second end piece from the media pack. The second end axial projection includes a second seal support thereon, with a second seal member mounted on the second seal support and positioned for sealing engagement with appropriate structure, for example the internal sealing flange of the bowl or housing bottom, i.e. to surround and define a liquid drain outlet.
In general terms, the housing and filter cartridge are configured such that: crankcase ventilation gases directed into the housing are directed into an annular region inside the housing and around the filter cartridge; then through the media to the central interior; then outwardly from the filter cartridge through the first end piece; then into the inner section of the outlet tube; and, then outwardly from the filter assembly. In addition, the housing and filter cartridge are configured such that liquid coalesced within the media pack can drain to the liquid drain, through the liquid drain and outwardly from the filter assembly.
In an example depicted, as the crankcase ventilation gases are directed into the housing, they are directed into a volume between internal and external flanges of a cover assembly, before being directed into an annular region inside the housing, and around the filter cartridge.
In an example shown and described, the filter cartridge includes a check valve therein comprising a valve member and first and second valve seats. The valve member can comprise a ball, positioned within the open filter interior. In a typical arrangement, the crankcase ventilation filter assembly includes a support positioned within open filter interior, with the ball positioned therein.
In such arrangements, the first valve seat is positioned adjacent to the first end piece. The valve member, when positioned against the first valve seat, closes the valve seat to flow of liquid therethrough. By this is not necessarily meant that the valve seat is fully “sealed” but rather that liquid flow through the first valve seat is substantially inhibited. The first valve seat would typically be located in the first end piece. Thus the valve member (i.e. the valve ball) would not rest against the first valve seat unless a vehicle having the crankcase ventilation filter assembly mounted thereon, had flipped (rollover). As a result of the construction described, the check valve assembly protects the engine against liquid draining therein, in a rollover condition.
The second valve seat is positioned adjacent the second end piece; and, the valve member when positioned against the second valve seat, does not close the second valve seat to liquid flow therethrough. This would be a normal condition for the assembly, in use with an engine operating. The valve member, typically a valve ball, rests on the second valve seat. This does not, however, close the valve seat to drain of liquid therethrough, during normal operation.
In one example, the crankcase ventilation assembly is configured such that the upper rail of the framework is c-shaped (arcuate shaped), and includes a single gap therethrough, although alternatives are possible. When the upper rail is c-shaped with a single gap therethrough, the gap typically has an arcuate extension of no more than 60° and least 20°, typically within the range of 30°-60°, inclusive. In an example embodiment in which the upper rail comprises two arcuate sections, spaced by two gaps, each gap is typically at least 20° and not more than 60°.
In an example described, the first end piece of the filter cartridge includes an outer periphery with a plurality of spaced, radially outwardly projecting, projections thereon.
In an example assembly, the cover assembly includes an outer flange with a shoulder positioned above, typically pressing against, these, spaced, radially outwardly projecting, projections, on the first end piece. This helps secure the cartridge in operating position.
In another example, the second end piece of the filter cartridge is generally circular, except it has one straight, truncated, section therein.
Other features described and shown herein relate to a regulation valve assembly in the cover assembly; and, a relief assembly in the cover assembly. Further, a projection arrangement from the second end piece of the cartridge, positioned to engage an upward projection arrangement on a bottom of the bowl, is described.
In another aspect of the present disclosure, filter cartridge for use in a crankcase ventilation filtration arrangement is described. The filter cartridge comprises a media pack surrounding an open filter interior, a central media support tube surrounded by the media pack, first and second seal members, and first and second end pieces positioned with the media pack therebetween. In example described, the central media support tube and first and second end pieces comprise portions of a single integral molded piece.
In a typical example filter cartridge, the second end piece has an outer perimeter and includes a central aperture therethrough in communication with the open filter interior. Further, the second end piece includes a second seal support thereon projecting in a direction away from the first end piece. The second seal support on the second end piece supports the second seal member for sealing at a location: spaced across the second end piece at least 20% of a distance across the second end piece from the outer perimeter toward the central recess. Further, it is typically spaced at least 20% of a distance across the second end piece from the central aperture toward the outer perimeter. (Usually it is also spaced in overlap with the media pack at least 20% across the media pack from both inner and outer edges of the media pack).
In a typical example, the second end piece is an end piece of the filter cartridge directed downwardly, in typical use.
Also in a typical example filter cartridge arrangement according to an aspect described herein, the first end piece includes a first axial projection thereon, extending in a direction away from the second end piece. The first end piece includes an outer perimeter and a central aperture. The first axial projection includes a base section with a first seal member mounted thereon: i.e. the base section operates as a seal support. Further, first axial projection includes a framework having a rail arrangement and rail support arrangement. The rail arrangement and rail support arrangement are typically positioned to support the seal arrangement spaced across the first end piece from the outer perimeter a distance corresponding at least 20% of the distance from the outer perimeter toward the central aperture. Further, the seal arrangement on the first partial projection is analogously positioned In addition, the rail arrangement and rail support arrangements are typically positioned at least 20% of the distance across the first end piece from the central aperture toward the outer perimeter. Further, the seal support is typically is analogously positioned. Also, typically each of the support and seal are positioned in overlap with the media pack at a location spaced across the media pack at least 20% (of a distance across the media pack) from both inner and outer edges of the media pack.
In one arrangement, a rail member of the framework has a c-shape, usually with a single gap therein (at an open end of the c). In example, the gap in the c-shape extends over a radial arc of at least 20°, usually not more than 60° and often within the range of 30°-60°, inclusive. In a second embodiment, the rail or rail arrangement comprises two arcuate rail sections, spaced by two gaps; each gap being at least 20° and typically not more than 60°.
In examples described, the second end piece includes a drain aperture arrangement therethrough, in direct drain overlap with an end of the media pack. Typically the drain aperture arrangement includes one or more drain apertures each of which is positioned spaced from an outer perimeter of the second piece by at least 40% of the distance from the outer perimeter of the second end piece toward the central aperture of the second end cap; and in overlap with the media pack at least 40% thereacross from an outer edge toward an outer edge. In a typical example in which the assembly includes a support tube, the drain aperture arrangement can comprise one or more apertures adjacent to, and generally radially outwardly from, the support tube. In examples shown, the portion of support tube adjacent to which the aperture arrangement is positioned, is an impermeable section of the support tube.
In example filter cartridge arrangements described, the second end piece will be orientated directed downwardly during normal installation. The second end piece can further include a projection arrangement thereon, directed downwardly, for example in the form of hook or snap fit members.
In an example, the filter cartridge further includes a check valve therein, comprising a first valve seat, a second valve seat and a valve member. The second valve seat is typically adjacent to the second end piece and the first valve seat is typically adjacent to the first end piece. The valve member is typically oriented to close the first valve seat to passage of liquid therethrough, when positioned thereagainst; and, to not close the first valve seat, when positioned thereagainst. In operation of the assembly, the check valve arrangement operates to provide some roll over protection to the engine, when the assembly is installed. In an example described, the valve member is a ball. Further, the first valve seat typically comprises a end member snap fit to the central aperture of the first end piece.
In another aspect to the present disclosure, a filter cartridge for crankcase ventilation filtration is provided. The filter cartridge comprises a media surrounding an open filter interior, and further includes a central media support tube surrounded by the media pack and having first and second ends. First and second end pieces are positioned with the media pack therebetween. The first and second end pieces can be formed integral with a central media support. A check valve arrangement is included in the filter cartridge, having a first valve seat, a second valve seat and a valve member. The first valve seat is positioned adjacent to a first end of the central media support tube, the second valve is positioned adjacent to a second end of the central media support tube and the valve member is positioned within the central media support tube. The valve member is configured and positioned in a manner removably between the first and second valve seats. The first valve seat is configured so that when the valve member is seated thereto, the valve seat is closed to flow of liquid therethrough. Further, the second valve seat is configured so that when the valve member is seated thereto, the second valve seat is not closed to the passage of liquid therethrough. When oriented in this manner, the check valve arrangement operates to protect the vehicle during rollover, from liquid draining thereto from the filter cartridge.
In a typical example, the valve may compromise a ball. Also in a typical example, the first valve seat comprises a seat member snap fit to the first end piece.
In a another aspect to the present invention, a crankcase ventilation filter assembly is provided. The assembly comprises a housing having an interior, for example, defining a bowl (housing base) and a cover assembly. The cover assembly includes an air flow outlet tube, including an inner section; an optional air flow inlet tube; an internal flange; and, and an external flange. Typically the bowl (housing base) defines an interior and is releasably secured to the cover assembly, for example with a threaded arrangement. The bowl (housing base) includes a bottom with a liquid drain surrounded by an internal flange. The air flow inlet can be positioned in an alternate location form the cover assembly.
A filter cartridge as previously described can be operably positioned in the housing interior with first valve seat adjacent from the cover assembly; and, with a second valve seat remote from the cover assembly.
It is noted that a number of additional specific example features are described herein, for use in association with assemblies and components as characterized. It is further noted that an arrangement does not need to include all of the features characterized herein, to obtain some advantage according the present disclosure. Methods of use are also described.
This application is being filed on 29 Jan. 2010, as a US National Stage of PCT International Patent application No. PCT/US2008/071783, filed 31 Jul. 2008 in the name of Donaldson Company, Inc., a U.S. national corporation, applicant for the designation of all countries except the US, and Gregoire Jacob and Robert Wood, both citizens of Belgium, applicants for the designation of the US only, and claims priority to U.S. Provisional patent application Ser. No. 60/962,993, filed Aug. 2, 2007, and which applications are incorporated herein by reference. To the extent appropriate, a claim of priority is made to each of the above disclosed applications. The above referenced application, includes, with edits, the disclosure of U.S. provisional application 60/962,993, filed Aug. 2, 2007. The complete disclosure of U.S. 60/962,993 is incorporated herein by reference. A claim of priority to 60/962,993 is made, to the extent appropriate.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/US2008/071783 | 7/31/2008 | WO | 00 | 9/22/2010 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2009/018454 | 2/5/2009 | WO | A |
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| Invitation to Pay Additional Fees with Partial International Search mailed Nov. 11, 2010. |
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| Number | Date | Country | |
|---|---|---|---|
| 60962993 | Aug 2007 | US |
