How to Assemble a Canister Filter System

Abstract

A method (500) of assembling a canister filter system includes inserting a first filter component into a second filter component (step 502), and continuing the insertion until a first tab of the first filter component or the second filter component contacts the other of the first filter component and the second filter component (step 504).

Description

Technical Field

[0001] The present invention generally relates to canister filter systems that employ replaceable filter elements. More specifically, the present invention relates to a filter element that includes a locking feature for retaining the filter element in a desired position while providing a seal that helps ensure that dirty fluids are filtered by the filter media of the filter element. Background Art

[0002] Liquid filtration systems are known for filtering various fluids, such as gas, oil, diesel fuel, etc., to remove contaminants from these fluids. For example, in a diesel engine, a fuel line filter is used to separate water and debris from the fuel. These contaminants can accumulate in the lower portion of the filter housing (also referred to as a canister). Typically, the center tube of the filter element provides support for the filter media, but does not always provide the desired location and retention.

[0003] U.S. Patent Application Publication No. 20060207948 to Haake et al. discloses a fluid filter assembly including a housing, a maintenance cover, a center tube removably fixed to the maintenance cover, a filter cartridge removably sealed and surrounding the center tube, and a sealing device. When the fluid filter assembly is in operation to filter the fluid, the sealing device is located between the center tube and a portion of the housing to seal off discharge changes to the clean fluid flow passing therethrough.

[0004] During normal operation of the Hack, the fluid filter assembly operates to allow fluid to flow into the housing through the inlet passage, through the filter cartridge, through the opening in the center tube, and out of the housing through the outlet passage. The method for maintenance includes removing the maintenance cover from the housing to remove the center tube from the housing together with the maintenance cover, and opening the discharge flow passage. Next, the filter cartridge is removed from the center tube, and a new filter cartridge is operably installed on the center tube. Next, the maintenance cover of the center tube with the new filter cartridge is operably installed in the housing to close the discharge flow passage.

[0005] In the Haake disclosure, a filtering method directs a fluid to be filtered into a housing having a removable and replaceable filter cartridge; then directs the fluid through a tubular region of filter media in the cartridge; then through a fluid opening in a center tube; and into a clean fluid flow passage. An exemplary method includes preventing the fluid from bypassing the filter media by removably sealing the filter cartridge to the center tube. An exemplary method also includes preventing the fluid from flowing into a drain passage by removably sealing the center tube to other portions of the filter housing. Systems utilizing the filter assembly described in the Haake disclosure include fuel systems, lubricating oil systems, and hydraulic systems.

[0006] Haake does not disclose features on the center tube that can be used to locate and hold the filter element in a desired position while also providing a seal that forces dirty fluid to pass through the filter media of the filter element before exiting the filter element. Summary of the invention

[0007] An interface for use with a filter system according to an embodiment of the present invention may include a filter element comprising at least a partially cylindrical configuration and defining a longitudinal axis and a radial direction. The filter element may include an annular filter medium defining a central channel, a center tube disposed in the central channel of the annular filter medium, the center tube defining a central reservoir, and the annular filter medium surrounding the center tube and the central reservoir. A first open end may be connected to a center tube disposed along the longitudinal axis, the first open end also defining a first locking groove, and a second open end may be connected to the center tube relative to the first open end disposed along the longitudinal axis. The second open end may also define a second locking groove. A first base including a first lug disposed in the first locking groove may be provided, and a second base including a second lug disposed in the second locking groove may also be provided. The second lug may be configured differently as the first lug.

[0008] A filter seal for use with a canister filter system according to embodiments of the present invention may include an annular body defining an outer diameter, a thickness, and a central bore.

[0009] A method of assembling a canister filter system according to an embodiment of the present invention may include inserting a first filter component into a second filter component and continuing the insertion until a first tab of the first or second filter component contacts the other of the first and second filter components. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a front cross-sectional view of a filter assembly including a filter base, a canister, and a filter element including a center tube having a locking feature according to an embodiment of the present invention and a base configured to mate with the locking feature.

[0011] Figure 2 is similar to Figure 1 A front cross-sectional view of a bottom portion of a filter assembly with an annular filter media removed illustrating engagement of a locking feature of a base with a center tube in accordance with an embodiment of the present invention.

[0012] Figure 3 yes Figure 2 A perspective view of the filter assembly showing how the base rests on or extends from the bottom of the canister.

[0013] Figure 4is an enlarged perspective view of the tabs of the base mating with the locking features of the center tube.

[0014] Figure 5 Shown with Figure 3 The filter assembly isolates the cartridge canister and base.

[0015] Figure 6 is a bottom-oriented perspective view of a filter seal showing its aperture which is configured to mate with a cylindrical or conical surface of a base.

[0016] Figure 7 is with Figure 1 A perspective view of the filter assembly showing the center tube in isolation.

[0017] Figure 8 is a conceptual illustration of how to convert a structure similar to Figure 7 A perspective view of a center tube of a filter assembly configured to mate with a base at a top end and a pedestal at a bottom end.

[0018] Fig. 9 is shown with Figure 8 The bottom portion of the enlarged detail of the center tube and the locking groove of the base are similar, except that Fig. 9 The base is shown near the top in FIG. The tabs of the base are shown rotated during the assembly or locking operation.

[0019] Fig.10 Shows Fig. 9 The tabs of the base are small enough to fall into the pawl notches.

[0020] Fig.11 is shown with Figure 8 A similar enlarged detailed view of the top portion of the center tube and the engagement of the locking grooves of the base. The base tabs are shown to be too large to fit into the detent notches.

[0021] Fig.12 is included with Figures 9 and 10 Flowcharts of associated operations or assembly methods. DETAILED DESCRIPTION

[0022] Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used throughout the drawings to represent the same or similar parts. In some cases, a reference numeral will be indicated in this specification and the drawings will show the reference numeral followed by a letter, such as 100a, 100b, or a prime indicator such as 100', 100", etc. It should be understood that the use of a letter or prime immediately following the reference numeral indicates that these features are of similar shape and have similar functions, as is typically the case when geometric shapes are mirrored about a plane of symmetry. For ease of explanation in this specification, letters or primes are generally not included herein but may be shown in the drawings to indicate repetition of features discussed in this written specification.

[0023] First, a filtration system will now be described to give the reader an appropriate context for understanding how to use the various embodiments of the present invention. It should be understood that this description is given as an example and does not have any limiting meaning. Any embodiment of the apparatus or method described herein can be used in conjunction with any filtration system.

[0024] Next, a filter element that may include a center tube with a locking feature according to various embodiments will be discussed. This feature may be located at the bottom end of a liquid filter assembly having a reusable housing (which may be referred to as a canister), and it may radially and axially locate the filter element in the canister (which may also be referred to as a housing) while also separating clean fluid from dirty fluid on different sides of the filter media via a seal. In a fuel-water separator, the locating geometry may be configured to form a chamber for collecting water (i.e., a water bowl) or debris by preventing the element from extending to the bottom of the canister.

[0025] Figure 1 A canister filter system 100 is shown that may utilize a filter element 200 and a base 300 according to various embodiments of the present invention.

[0026] The canister filter system 100 may include a canister filter having a base 102 (shown as being divided into a base adapter 102a and a filter base 102b, but may be one integral component), a canister 104, a base 300, and a filter element 200. The canister filter system 100 may be used to filter fluids such as diesel or gasoline or other liquid fuels, lubricating oils, hydraulic fluids for hydraulic power systems, transmission fluids, or even potentially intake air for an engine. The canister filter system 100 may also be used as a fuel / water separator filter. The canister filter system 100 having the features described herein may be adapted by one of ordinary skill in the art for many different purposes and is suitable for many other applications.

[0027] The base 102 includes an inlet passage 106 for fluid to enter the canister filter system 100 and an outlet passage 108 for fluid to exit the canister filter system 100. A clip 110 is provided to connect the canister 104 to the base 102. Other connection structures may be used, such as threads.

[0028] The cartridge 104 includes Figure 1 The top open end 112 and the bottom open end 114 shown, or as Figure 2 and Figure 3 Bottom closed end 116 is shown.

[0029] The filter element 200 can take many different forms to suit a particular application. In the illustrated embodiment, the filter element 200 is well suited for filtering fuel or lubricating oil. The filter element 200 can include an annular filter medium 202 that circumferentially surrounds a central reservoir 204 defined by a central tube 206. The axial ends of the annular filter medium 202 are shown sealed by end caps.

[0030] The top end cap 208 may define an axially open end of the filter element 200. The top end cap 208 is referred to as "open" because it includes an opening 210 that allows fluid to pass therethrough.

[0031] On the other hand, bottom end cap 212 defines an axially closed end of filter element 200. Bottom end cap 212 is referred to as "closed" because it prevents any fluid outside of filter element 200 adjacent the axial end of annular filter media 202 from flowing into center tube 206 unfiltered.

[0032] The top end cap 208 and the bottom end cap 212 may each be connected to the center tube 206 by welding, adhesives, etc. Alternatively, some or all of the center tube 206, the top end cap 208, and the bottom end cap 212 may be constructed as a single component. Conversely, the bottom end cap 212 and / or the top end cap 208 may be separate components from the center tube 206, etc. Further details of the closed configuration of the bottom of the canister filter system 100 and the filter element 200 will be discussed below.

[0033] In operation, the fluid to be filtered enters from the inlet passage 106 and flows into the annular cavity 118 between the cartridge 104 and the annular filter medium 202. The fluid then enters and passes through the filter medium 202 and then passes through the Figure 1 The perforations 214 shown in FIG. 2 enter the center tube 206 .

[0034] The fluid then exits the center tube 206 through the top end cap 208 and opening 210 into the outlet passage 108. The sealing structure at the bottom of the filter element 200 helps define the fluid passages entering and exiting the annular filter medium 202, preventing any fluid from flowing directly to the outlet passage 108 and bypassing the annular filter medium 202. To this end, a sealing feature may be provided, which will be discussed in detail below. In addition, it may be desirable to form a chamber between the bottom of the filter element and the bottom of the canister (e.g., a water bowl in a fuel-water separator, a drain reservoir, etc.). Therefore, a positioning feature may be provided, which will be discussed below.

[0035] See now Figures 1 to 3 , a canister filter system 100 according to various embodiments of the present invention providing locking and / or locating features will now be discussed.

[0036] The canister filter system 100 may include a filter element 200 that at least partially includes a cylindrical configuration and defines a longitudinal axis 216, a circumferential direction 217, and a radial direction 218. The filter element 200 may include an annular filter medium 202 that defines a central passage 219 and a center tube 206 disposed in the central passage 219 of the annular filter medium 220, the center tube 206 defining a central reservoir 204. Thus, the annular filter medium 202 surrounds the center tube 206 and the central reservoir 204.

[0037] like Figure 1 As shown, the filter element 200 may further include a top open end 220 connected to the center tube 206 disposed along the longitudinal axis 216. The top open end 220 includes an opening 210 that allows fluid to flow from the central reservoir 204 to the exterior of the filter element 200.

[0038] Similarly, the filter element 200 can include a bottom open end 222 connected to the center tube 206 opposite the top open end 220, the bottom open end 222 also being disposed along the longitudinal axis 216. Thus, the bottom open end 222 allows for insertion of the base 300.

[0039] The canister filter system 100 may also include a canister 104 and a base 300, the canister 104 including a top open end 112 relative to the longitudinal axis 216 (see Figure 1 ) and bottom closed end 116 (see Figure 2 and Figure 3 ), the base 300 rests on the bottom closed end 114 of the cartridge 104. In other embodiments of the present invention, for example, Figure 1 This may not be the case in the embodiment where the base 300 is molded integrally with the cartridge 104.

[0040] See now Figures 2 to 5The base 300 may include an at least partially annular body 302 (may be completely annular with a through hole 304 extending from end to end, as in Figure 5 Best seen in, or not as Figure 1 ), the body defines a longitudinal axis 306, a radial direction 308, and a circumferential direction 310 (see Figure 5 , which can be concentric with the filter element once assembled).

[0041] focus on Figure 5 The body 302 may include a top annular portion 312 terminating at a top free end 314 (whether open or closed), and may also define a top diameter 316 (i.e., a top outer diameter), and a bottom annular portion 318 defining a bottom diameter 320 (i.e., a bottom outer diameter) that is greater than the top diameter 316.

[0042] Tabs 322 may extend radially from the top annular portion 312 and may provide the filter seal 120 with a defined aperture 122 configured to mate with the bottom annular portion 318 of the base 300 (see also FIG. Figure 6 ).

[0043] Continue to refer to Figure 5 , the base 300 can rest on the bottom closed end 114 of the canister 104. The filter seal 120 can be disposed under the tabs 322 of the base 300 and around the bottom annular portion 318 while contacting the canister 104.

[0044] More specifically, the canister 104 includes an outer diameter 126 that defines a base diameter 320 that is greater than the base 300 (see Figure 1 ) of the outer annular wall 124, a support wall 128 configured to support the bottom annular portion 318 of the base 300, and a support wall 128 connected to the outer annular wall 124 (see Figure 5 ) of the arcuate wall 130 (other configurations are also possible).

[0045] like Figure 3 As shown, the filter seal 120 may contact the arcuate wall 130, forming a drainage reservoir 132. More specifically, the bottom open end 222 of the center tube 206 may impact the filter seal 120, thereby forming a fluid seal between the center tube 206 and the filter seal 120, and forming another fluid seal between the filter seal 120 and the arcuate wall 130 of the canister 104.

[0046] See also Figure 6, the ratio of the outer diameter 136 of the filter seal to the thickness 134 of the filter seal 120 can be in the range of 10.0 to 30.0, and the ratio of the outer diameter 136 to the hole diameter 137 can be in the range of 1.5 to 3.0. In addition to the elastomeric composition of the filter seal, this geometry can provide an appropriate balance between rigidity and flexibility to allow the center tube and the base to be connected while providing a watertight seal. For example, a polyurethane material with a hardness of 55 to 65 Shore A (e.g., 60 Shore A) can be used.

[0047] See also Figures 2 to 4 , the center tube 206 includes a locking groove 224 that extends axially from the bottom open end 222 of the center tube 206 an axial distance 226 and then circumferentially a circumferential distance 228.

[0048] Reference Figure 3 and Figure 5 , the center tube 206 may define an inner diameter 230 that is slightly larger (i.e., a gap of 0.015 inches to 0.030 inches) than the top diameter 316 of the base 300 disposed within the inner diameter 230, and the tab 322 of the base 300 may be disposed in the locking groove 226 and may be configured to guide the movement of the center tube 206. This arrangement may provide a positioning / centering function. Although not shown, in some embodiments, such as when the annular filter medium does not extend axially beyond the locking groove, an O-ring or other seal may be provided at this interface 138 to prevent fluid from bypassing the annular filter medium 202.

[0049] like Figure 5 As shown, the base 300 may include a flared annular portion 324 (e.g., conical, arcuate, etc.) connecting the top annular portion 312 to the bottom annular portion 318. This feature may be omitted in other embodiments. Figure 6 As shown, the radial inner surface 234 of the center tube 206 may have a matching shape (eg, angled or tapered) to facilitate mounting the center tube / filter element to the base. This may provide guidance when the tab enters the locking groove.

[0050] Reference again Figure 5 , the bottom annular portion 318 can be connected to the cartridge 104. For example, when the cartridge and the base are formed by thermoplastic injection molding (e.g., using polyethylene oxide materials, nylon materials, etc.), the base can be ultrasonically welded to the cartridge, molded integrally with the can, snapped onto the cartridge, threaded onto the cartridge, etc. In addition, the protrusion can extend from the cartridge, the base is centered around the cartridge, etc. Other manufacturing methods are possible, including sheet metal manufacturing, etc. When metal is used, the base can be attached to the cartridge by welding, brazing, threading, etc.

[0051] The bottom annular portion 318 may define at least one through slot 326 extending radially and possibly axially downwardly through the bottom annular portion 318. This may allow water or debris to drain from the central reservoir 204 of the center tube 206 to the drainage reservoir 132 (e.g., see Figure 3 ).

[0052] Now, refer to Figures 1 to 4 and Figure 7 Discussion A filter element 200 that may be used with a filter element that includes at least a partial annular configuration (eg, cone, cylinder, other solid of revolution, etc.) and that may be used with the canister filter system 100 just described.

[0053] from Figure 1 and Figure 7 Initially, the filter element 200 can define a longitudinal axis 216 , a radial direction 218 , and a circumferential direction 217 . Furthermore, the filter element 200 can include an annular filter media 202 defining a central passage 219 .

[0054] The center tube 206 may be disposed in a central channel 219 of the annular filter medium 202, which defines the central reservoir 204. Thus, the annular filter medium 202 surrounds the center tube 206 and the central reservoir 204. The top open end 220 may be connected to the center tube 206 disposed along the longitudinal axis 216. The top open end 220 includes an opening 210 that allows fluid to flow from the central reservoir 204 to the exterior of the filter element 200, and vice versa.

[0055] Similarly, the bottom open end 222 can be connected to the center tube 206 axially opposite the top open end 220 disposed along the longitudinal axis 216. Figure 3 As shown, the bottom open end 222 may define a radially outer surface 232 and a radially inner surface 234 that is in communication with the central reservoir 204 .

[0056] See also Figures 2 to 4 , the locking feature 236 can be arranged near the bottom open end 222 of the center tube 206. The locking feature 236 may include an entry slot 238 disposed on the radial inner surface 234 of the center tube 206, the entry slot 238 extending axially upward from the bottom open end 222. The entry slot is configured to allow the center tube 206 to slide over the tab 322 of the base 300 mentioned earlier herein during assembly.

[0057] like Figure 4As best shown in FIG. 2 , the locking feature 236 may further include a ramp groove 240 that extends axially upward and circumferentially counterclockwise from the inlet groove 238 in a predetermined direction 241. The ramp groove 240 is in communication with the inlet groove 238 so that when the center tube 206 moves downward, as the tab 322 of the base 300 moves upward in the inlet groove 238, the tab 322 will eventually reach the ramp groove 240. Circumferentially twisting the center tube 206 will cause the center tube 206 to move downward, impacting on the filter seal 120 (see, for example, FIG. 24A ). Figure 3 ). In other embodiments, this arrangement can be reversed so that the ramp grooves extend axially upward and circumferentially clockwise. In this case, the center tube needs to be twisted in the opposite direction.

[0058] Continue to refer to Figure 4 , the locking feature 236 may also include a circumferential locking groove 242 extending circumferentially in a counterclockwise direction from the ramp groove 240. The circumferential locking groove 242 communicates with the ramp groove 240 and terminates at a stop surface 244. Thus, when the center tube 206 is twisted circumferentially, the axial position of the center tube is substantially fixed by the tab 322 of the base 300. Likewise, this arrangement can be reversed so that the circumferential locking groove extends in a clockwise direction so that the center tube must be rotated in the opposite direction.

[0059] Continued twisting of the center tube 206 in the counterclockwise direction will allow the tab 322 to contact or nearly contact the stop surface 244, at which point the upward force applied by the filter seal 120 causes the center tube 206 to move slightly upward until the tab 322 engages the detent notch 246 extending axially downward from the circumferential locking groove 242 in communication therewith. The center tube 206 is now locked in place axially, radially, and circumferentially to prevent unintentional movement.

[0060] The inclined surface 248 may extend from the detent notch 246 to the stop surface 244, matching the shape of the tab 322. Thus, the inclined surface 248 may be parallel to the predetermined direction 241 in which the ramp groove 240 extends. Likewise, the stop surface 244 may extend axially to match the shape of the tab 322.

[0061] Other configurations are possible for these various features.

[0062] See also Figure 4 and Figure 7, the center tube 206 has a necked configuration at the bottom open end 222, the necked configuration including an enlarged bottom annular portion 248, a reduced top annular portion 250, and a transition annular portion 252 therebetween. The inlet groove 238 is formed by the enlarged bottom annular portion 248 and the transition annular portion 252. The ramp groove 240 is formed by the transition annular portion 252 and the reduced top annular portion 250. The circumferential locking groove 242 and the detent notch 246 are formed by the reduced top annular portion 250.

[0063] Likewise, other configurations of these features are possible in other embodiments of the invention.

[0064] See also Figure 7 , it can be seen that the center tube 206 (and therefore the filter element 200) is configured so that both ends are similarly or identically configured. Therefore, the center tube 206 can be rotated 180 degrees about an axis extending through the axial midpoint of the center tube and perpendicular to the longitudinal axis 216 and still be able to be installed with the base 300. This may not be the case in other embodiments of the present invention. In this case, the top locking feature may or may not be used to attach the base to the center tube. An example of using top and bottom locking features in a canister filter system will be discussed below.

[0065] The top portion of the entry slot 238 and the entire ramp slot 240, circumferential locking slot 242 and detent notch 246 extend completely radially through the center tube 206. On the other hand, the lower portion of the entry slot 238 does not extend completely radially through the center tube 206 (indicated by the dashed lines). Therefore, the side action can form a through portion of these features, while the bottom core can form a blind portion of the entry slot and contact the side action. Therefore, the center tube can be manufactured using a thermoplastic injection molding process. Nylon, polyurethane or any other suitable material can be used to form the center tube.

[0066] Other configurations for these features may be employed to facilitate use with other manufacturing processes, etc.

[0067] Next, we will refer to Figure 4 and 5 A base 300 that may be used with a canister filter system 100 and a filter element 200 for positioning and retaining the filter element 200 in the canister filter system 100 is discussed.

[0068] The base 300 may include an at least partially annular body 302 defining a longitudinal axis 306 , a radial direction 308 , and a circumferential direction 310 .

[0069] The body 302 may include a top annular portion 312 terminating at a top free end 314, as previously described herein. A tab 322 extends radially from the top annular portion 312. The tab 322 includes a first axial surface 328, a bottom circumferential surface 330, and a bottom ramp surface 332 extending from the bottom circumferential surface 330. The first axial surface 328 is configured to engage a surface of the inlet groove 238, the bottom circumferential surface 330 is configured to engage a surface of the circumferential locking groove 242, and the bottom ramp surface 332 is configured to engage a surface of the ramp groove 240 of the center tube 206, as previously described herein.

[0070] In addition, the tab 322 also includes a top ramp surface 334 extending from the first axial surface 328, which is parallel to the bottom ramp surface 332 for engaging the other surface of the ramp groove 240. A top circumferential surface 336 extends from the top ramp surface 334 engaging the other surface of the circumferential locking groove 242. The second axial surface 338 connects the bottom ramp surface 332 to the top circumferential surface 336 and is configured to engage the stop surface 244 of the center tube 206.

[0071] The base 300 may be complementary in shape to the bottom open end 222 of the central tube 206. Figure 5 As shown, the base 300 may have a bottom annular portion 318 defining a bottom diameter 320 and a top annular portion 312 defining a top diameter 316 that is smaller than the bottom diameter 320. In addition, a flared annular portion 324 (also referred to as a funnel annular portion) connects the top annular portion 312 to the bottom annular portion 318.

[0072] The base 300 may also include a canister portion 340 (e.g., may be connected to the canister portion 340) and may include an annular outer wall 342 defining an outer diameter 344 greater than the bottom diameter 320 of the bottom annular portion 318 to form the annular cavity 118 (see Figure 1 ).like Figure 5 As best shown in FIG. 3 , the support wall 346 is configured to support the bottom annular portion 318 , and the funnel wall 348 connects the annular outer wall 342 to the support wall 346 .

[0073] See also Figure 1 , Figure 7 and Figure 8 It will be appreciated that the canister filter system 100 and its center tube 206 may be modified such that the center tube 206 has top and bottom locking features for attaching both the base 102 and the canister 104 to the filter element 200. Figure 8 As shown, a top base 300 may be provided, the top base 300 and the Figure 5The top base 300 is constructed identically to the top base 102, except that the top base 300 has been rotated 180 degrees about an axis passing through the axial midpoint of the center tube 206 and perpendicular to the longitudinal axis 216 of the center tube 206, so that the top base 300 can be operably associated with the base 102 rather than the cartridge canister 104 (e.g., attached to the base rather than the canister as previously described herein).

[0074] exist Figure 8 In the embodiment, a bottom base 300 ′ may be provided, comprising an at least partially annular body 302 ′ defining a longitudinal axis 306 ′, a radial direction 308 ′ and a circumferential direction 310 ′, wherein the longitudinal axis 306 ′, the radial direction 308 ′ and the circumferential direction 310 ′ are defined in the same manner as the directions of the top base 300 .

[0075] The bottom base 300' may include a top annular portion 312' that terminates in a top free end (not explicitly shown, but understood to be similar to that previously described with respect to the base 300 or Figure 1 ), and defines a top diameter (not clearly shown, but understood to be similar to that previously described for base 300 or Figure 1 Likewise, bottom base 300' may also include a bottom diameter (not explicitly shown, but understood to be similar to or similar to that previously described for base 300) that is greater than top diameter 316'. Figure 1 318'). A flared annular portion 324' connects the top annular portion 312' to the bottom annular portion 318'. In addition, a bottom tab 322' extends radially from the top annular portion 312'.

[0076] The bottom annular portion 318' may define at least one through slot (not explicitly shown, but understood to be similar to the through slots previously described with respect to the base 300) that extends radially and possibly axially downwardly through the bottom annular portion 318' similar to the base 300 previously described herein. It should be appreciated that in some embodiments, the base 300 may be replaced with Figure 8 The bottom base 300' is shown in FIG.

[0077] For example, Figure 1 , Figure 2 and Figure 3 It will be appreciated that the cartridge 104 may include an outer annular wall 124 defining a portion of the cartridge 104 that is larger than the bottom base 300' ( Figure 8 The support wall 346 will support the bottom annular portion 318' of the bottom base 300', and the arcuate wall 130 connects the support wall 346 to the outer annular wall 124.

[0078] like Figure 2 and Figure 3 As shown, the filter seal 120 will contact the arcuate wall 130, forming a drainage reservoir 132. In addition, the bottom open end 222 of the modified center tube 206 will impinge on the filter seal 120, sealing between the center tube 206 and the filter seal 120, and forming another fluid seal between the filter seal 120 and the arcuate wall 130. The arcuate wall can have other shapes, such as conical, etc. In some embodiments, such as when the canister has a bottom closed end, etc., the filter seal can be omitted.

[0079] Refer to Figure 8 , the center tube 206' includes a bottom locking groove 224' that extends axially from the bottom open end 222' of the center tube 206 an axial distance 226' and then circumferentially a circumferential distance 228'. The center tube 206' may also have a top locking groove 224", which extends axially from the top open end 220' of the center tube 206' another axial distance 226", and then extends circumferentially in an opposite direction compared to the bottom locking groove 224'.

[0080] Additionally, the center tube 206' may define an inner diameter slightly larger than the top diameter of the bottom pedestal 300' disposed within the inner diameter of the center tube 206' (not explicitly shown, but understood to be similar to that previously described or described for the pedestal 300). Figure 1 ). The bottom tab 322' of the bottom base 300' is disposed in the bottom locking groove 224' and is configured to guide the movement of the center tube 206'. In addition, the top base 300 can define a diameter (e.g., 316) that is slightly smaller than the inner diameter of the center tube 206' and is disposed within the inner diameter of the center tube 206'. The top tab 322 of the top base 300 can be configured differently from the bottom tab 322' of the bottom base 300', and the top tab 322 can be disposed in the top locking groove 224" to guide the movement of the base.

[0081] Continue to see Figure 8 , a filter element having a center tube 206' with top and bottom locking features that can be used with the filter cartridge system just described will now be discussed. It should be understood that Figure 8 The center tube 206' shown is simplified to illustrate the use of both top and bottom locking features. In practice, the middle portion of the center tube 206' will have a similar Figure 7 Perforations shown.

[0082] As mentioned previously herein, the center tube 206' may have a bottom open end 222' joined to the center tube 206' opposite the top open end 220', with the bottom open end 222' and the top open end 220' both disposed along the longitudinal axis 306'. The bottom open end 222' may define a radially outer surface 232' and a radially inner surface ( Figure 8 not clearly shown).

[0083] The first locking feature 236' may be disposed proximate to the bottom open end 222'. The first locking feature 236' may include a first entry slot 238' disposed on a radially inner surface (106') of the center tube 206' extending axially upward from the bottom open end 222'. Figure 8 The first ramp groove 240' may extend axially upward and circumferentially counterclockwise from the first inlet groove 238' in a first predetermined direction 241', and the first ramp groove 240' is in communication with the first inlet groove 238'. The inlet groove may be axially tapered to provide introduction during assembly.

[0084] Similarly, the second locking feature 236" may be disposed proximate the top open end 220'. The second locking feature 236" may include a second entry slot 238" disposed on the radially inner surface of the center tube 206' extending axially downward from the top open end 220'. Figure 8 The second ramp groove 240" may extend axially downward and circumferentially clockwise from the second inlet groove 238" along a second predetermined direction 241", and the second ramp groove 240" is connected to the second inlet groove 238".

[0085] like Figure 8 As shown, the first predetermined direction 241' and the second predetermined direction 241" are parallel to each other. For example, this can be true when the first locking feature 236' is identical to the second locking feature 236, 236", when rotated 180 degrees about an axis perpendicular to the longitudinal axis 306' and then axially and circumferentially aligned with the second locking feature 236". This may not be the case with other embodiments of the present invention.

[0086] The first locking feature may further include a first circumferential locking groove 242 ′ extending circumferentially counterclockwise from the first ramp groove 240 ′, communicating with the first ramp groove 240 ′ and terminating at a first inclined surface 254 extending axially upward and circumferentially counterclockwise.

[0087] Similarly, the second locking feature 236" may further include a second circumferential locking groove 242" extending circumferentially clockwise from the second ramp groove 240", communicating with the second ramp groove 240" and terminating at a second inclined surface 254' extending axially downward and circumferentially clockwise.

[0088] For first locking feature 236', first detent notch 246' may extend axially upward from first circumferential locking groove 242' in communication therewith. Likewise, for second locking feature 236", second detent notch 246" may extend axially downward from second circumferential locking groove 242" in communication therewith.

[0089] The first detent notch 246 ′ may terminate circumferentially at a first stop surface 244 ′ extending axially upward from the first ramped surface 254 , and the second detent notch 246 ″ may terminate circumferentially at a second stop surface 244 ″ extending axially downward from the second ramped surface 254 ′.

[0090] See also Figure 8 , the center tube 206' has a necked configuration at the bottom open end 222', the necked configuration including an enlarged bottom annular portion 248', a reduced top annular portion 250', and a transition annular portion 252' therebetween. The inlet slot 238' is formed by the enlarged bottom annular portion 248', the transition annular portion 252', and the reduced top annular portion 250'. The first ramp slot 240' is formed by the reduced top annular portion 250'. The first circumferential locking slot 242' and the first detent notch 246' are formed by the reduced top annular portion 250'. The top open end 220' is similarly described, which is mirrored about the axial midplane of the center tube 206'.

[0091] See also Figure 5 and Figure 8 , a pair of bases 300, 300' that may be used with the filter element just described will be discussed in greater detail.

[0092] Each of the pair of bases 300 , 300 ′ may include an at least partially annular body 300 , 302 ′ defining a longitudinal axis 306 , 306 ′, a radial direction 308 , 308 ′, and a circumferential direction 310 , 310 ′.

[0093] Each may have a top annular portion 312, 312 terminating at a top free end 314, and a tab 322, 322' extending radially from the top annular portion 312, 312'. The tab 322, 322' may include a first axial surface 328, 328', a bottom circumferential surface 330, 330', and a bottom ramp surface 332, 332' extending from the bottom circumferential surface 330, 330'. As in Figure 8 As best seen in FIG. 1 , a surface of one tab may be configured differently (eg, have different dimensions) than a corresponding surface of another tab, but need not be.

[0094] Still see Figure 5 and Figure 8 Each tab 322, 322' may further include a top ramp surface 334, 334' extending from a first axial surface 328, 328' parallel to the bottom ramp surface 332, 332', a top circumferential surface 336, 336' extending from the top ramp surface 334, 334', and a second axial surface 338, 338' connecting the bottom ramp surface 332, 332' to the top circumferential surface 336, 336'.

[0095] Each base 300, 300' may further include a bottom annular portion 318, 318' defining a bottom diameter 320, and the top annular portion 312, 312' defines a top diameter 316 that is smaller than the bottom diameter 320. A flared annular portion 324, 324' may connect the top annular portion 312, 312' to the bottom annular portion 320, 320'.

[0096] All these different surfaces of one lug can be configured differently from the corresponding surfaces of another lug.Therefore, the lugs of each of the pair of bases can be configured differently.

[0097] like Figure 8 As shown, multiple locking features and tabs may be used on both ends of the center tube 206', but this is not required.

[0098] exist Figure 8 During installation of the embodiment of the invention, the base and / or top base are first connected to the center tube of the filter element. Due to its size, the top tab is prevented from entering the upper detent notch. Then, since the bottom tab is smaller than the top tab, the base and filter element are connected to the bottom base until the bottom tab is seated in the lower detent notch.

[0099] Next, we will refer to Figures 9 to 11 An interface for use with a filtration system similar to that described earlier in this article is discussed.

[0100] The interface 400 may include a filter element 200 that is configured to be the same or similar to the filter element previously described herein. The filter element 200 may include a first open end 402 defining a first locking groove 404 and a second open end 406 defining a second locking groove 408. A first base 410 including a first lug 412 disposed in the first locking groove 404 may be provided. Similarly, a second base 414 including a second lug 416 disposed in the second locking groove 408 may be provided. The second lug 416 may be configured differently from the first lug 412. Any lug may have any suitable configuration, including rectangular, square, oval, circular, quadrilateral, etc.

[0101] In some embodiments, first locking groove 404 may be configured identically to second locking groove 408 when the geometry of the first locking groove is rotated an amount of 180 degrees about an axis perpendicular to longitudinal axis 216 of filter element 200 and then first locking groove 404 is axially, circumferentially, and radially aligned with second locking groove 408. This may not be the case in other embodiments of the invention.

[0102] like Fig. 9 and Fig.10 As shown, the first locking slot 404 may include a first detent notch 418 defining an end 420 axially farthest from the first open end 402 of the filter element 200 , and the first tab 412 may be configured to move axially into and out of the first detent notch 418 .

[0103] like Fig.11 As best shown in , the second locking slot 408 may include a second detent notch 422 defining an end 420 ′ axially farthest from the second open end 406 of the filter element 200 , and the second tab 416 may be configured to prevent movement into and out of the second detent notch 422 .

[0104] to this end, Fig.10 and Fig.11 The first tab 412 is shown to include a first bottom circumferential surface 424 defining a first bottom circumferential surface width 426, and the second tab 416 includes a second bottom circumferential surface 428 defining a second bottom circumferential surface width 430 that is greater than the first bottom circumferential surface width 424. These structural differences and the necked throat of the detent slot entrance formed by the axial throat surface 432 and the angled throat surface 434 allow the first tab to enter the detent slot without allowing the second tab to enter.

[0105] Furthermore, the first tab 412 includes a first ramp surface 436 and a second ramp surface 438 that are parallel to each other and define a first ramp width 440 measured perpendicular to the first ramp surface 436. Likewise, the second tab 416 defines a third ramp surface 442 and a fourth ramp surface 444 that are parallel to each other and define a second ramp width 446 measured perpendicular to the third ramp surface 442 and the fourth ramp surface 444. The second ramp width 446 may be greater than the first ramp width 440, thereby preventing it from entering the detent notch.

[0106] Thus, the first tab 412 can be configured to enter the first pawl notch 418 axially (into the entrance portion of the first locking groove 404), diagonally (along the ramp portion of the first locking groove 404), circumferentially (in the circumferential portion of the first locking groove 404), and axially, while the second tab 416 is configured to move axially, diagonally, and circumferentially in a similar manner to the first tab. Except that the second tab 416 reaches a stop in the second locking groove 408 before entering the second pawl notch 422 (see Fig.11 ). This may not be the case for other embodiments of the present invention.

[0107] In other embodiments of the present invention, any of the aforementioned features can be changed to be different in configuration. In particular, the locking groove can follow any desired path and can have walls of different configurations forming the locking groove, and the protrusion can have any suitable configuration, including circular, polygonal, etc.

[0108] Industrial Applicability

[0109] In practice, filter elements, bases, or canister filter systems according to any embodiment disclosed herein may be obtained or provided in an OEM (original equipment manufacturer) or aftermarket context. The various features discussed above may be used to properly orient, locate, and lock the various components of the canister filter system in place.

[0110] The center tube and base may be made of any suitable material, including plastic, metal, etc. It may be desirable to select a material that is chemically compatible with the fluid being filtered.

[0111] In previous designs, there may be problems associated with the attachment of the filter element to the housing (canister). Typically, it may be difficult to connect the filter element to the housing, maintain adequate force on the seal, and align the filter element to the housing.

[0112] Different embodiments of the present invention allow for a newly developed method to mount the filter element to the housing. The filter mounting helps ensure proper alignment of the filter element within the housing and maintains downward force on the seal. In addition, the new design of the filter element includes a slot in the center tube that will allow the tabs on the base of the filter housing to engage. As the filter is rotated, it will provide locking of the filter element to the housing and the required force to help ensure proper engagement of the seal with the base of the housing for separating pure water from impure water, etc. In addition, the slots and base tabs can be changed (in terms of quantity, location, configuration, etc.) to avoid using the wrong filter and damaging machine components.

[0113] More specifically, the tabs of the lower base engage the corresponding locking grooves of the center tube, providing a downward force to push the bottom seal into place when the filter is rotated into the housing during installation. Moreover, the position of the top seal is also set so that it will seal properly.

[0114] It is contemplated that other embodiments of the present invention may operate or be configured differently so as not to achieve all of the benefits just described.

[0115] In some embodiments, the filter element / center tube can be located on the top of the lug at the bottom of the housing. In this case, a suitable seal can be provided at the top end, but the user may have to provide a force to overcome the bottom seal, etc.

[0116] In other embodiments of the present invention, it is further contemplated that features of the base including tabs may be exchanged with features of the center tube / filter element including locking features / grooves, etc.

[0117] In view of the above, we can adopt Fig.12 The illustrated assembly method of a canister filter system according to an embodiment of the present application.

[0118] The method 500 may include inserting a first filter component into a second filter component (step 502), and continuing the insertion until a first tab of the first filter component or the second filter component contacts the other of the first filter component and the second filter component (step 504). For example, the filter element may be inserted into a filter base or a canister (housing), etc., until the filter element contacts a tab of the filter base or canister (or vice versa).

[0119] In particular embodiments, a first tab of the first filter component or the second filter component is slid into a first groove of the other of the first filter component or the second filter component (step 506).

[0120] Sometimes, the first protrusion slides upward in the first groove until the first protrusion reaches the slope portion of the first groove (step 508, see for example Figures 2 to 4 , Figure 8 ).

[0121] Then, the first filter component or the second filter component can be rotated so that the first tab slides along the ramp portion of the first groove until the first tab reaches the circumferential portion of the first groove so that the first filter component or the second filter component contacts the seal (step 510, see, for example, Figures 2 to 4 ).

[0122] Next, the first filter component or the second filter component (or both) may be rotated until the first tab reaches a stop or detent notch (step 512, see, e.g., Figure 4 , Fig.10 and Fig.12 ).

[0123] In some embodiments, the first tab slides upward or downward in the detent notch (step 514, see for example Figure 4 , Figure 8 and Fig.10 ).

[0124] In yet further embodiments, method 500 may further include attaching the first filter component or the second filter component to a third filter component to provide a seal (step 516, see, e.g., Figure 1 , which step indicates that the cartridge and the filter element may be attached to the base to create one or more seals).

[0125] The method 500 may also include inserting a second tab of the third filter component into the second groove of the first filter component or the second filter component until the second tab reaches the ramp portion of the second groove (step 518, see for example Figure 1 , Figures 8 to 11 ).

[0126] In this case, method 500 may further include rotating the first filter component or the second filter component until the second tab slides along the ramp portion of the second groove, reaches the circumferential portion of the second groove, and continues until the second tab reaches a second stop or second detent notch (step 520).

[0127] If the second detent notch is reached, the second tab may be slid upward or downward in the second detent notch (step 522).

[0128] For some embodiments of the present invention, once Figure 1 Assembled as best shown in FIG. 1 , a bottom seal 140 , an inner top seal 142 , and an outer top seal 144 may be formed to help prevent any fluid leakage.

[0129] It should be understood that the foregoing description provides examples of disclosed components and techniques. However, it is contemplated that other implementations of the present invention may differ in detail from the foregoing examples. All references to the present invention or its examples are intended to reference the specific examples discussed at that point, and are not intended to imply any limitation on the scope of the present invention more generally. All language regarding distinction and disparagement of certain features is intended to indicate a lack of preference for these features, but unless otherwise indicated, does not completely exclude them from the scope of the present invention.

[0130] Recitation of ranges of values ​​herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein.

[0131] It will be apparent to those skilled in the art that various modifications and variations may be made to the embodiments of the apparatus and assembly methods discussed herein without departing from the scope or spirit of the invention. Other embodiments of the invention will be apparent to those skilled in the art in view of the description and practice of the various embodiments disclosed herein. For example, the construction and function of some devices may be different from those described herein, and certain steps of any method may be omitted, performed in an order different from that specifically mentioned, or in some cases simultaneously or in sub-steps. In addition, certain aspects or features of the various embodiments may be changed or modified to produce other embodiments, and the features and aspects of the various embodiments may be added to or substituted for other features or aspects of other embodiments in order to provide other embodiments.

[0132] Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Additionally, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or clearly contradicted by context.

Claims

1. A method of assembling a canister filter system, the method include: inserting the first filter component into the second filter component; continuing the inserting until the first tab of one of the first filter component and the second filter component contacts the other of the first filter component and the second filter component; the first tab of the one of the first filter component and the second filter component slides into the first slot of the other of the first filter component and the second filter component; The first protrusion slides upward in the first groove until the first protrusion reaches the slope portion of the first groove; rotating the first filter component or the second filter component to cause the first tab to slide along the ramp portion of the first groove until the first tab reaches a circumferential portion of the first groove, causing the first filter component or the second filter component to contact a seal; and inserting the second protrusion of the third filter component into the second groove of the first filter component or the second filter component until the second protrusion reaches the slope portion of the second groove, The first tab includes a first bottom circumferential surface defining a first bottom circumferential surface width, and the second tab includes a second bottom circumferential surface defining a second bottom circumferential surface width greater than the first bottom circumferential surface width, The first groove of the other one of the first filter component and the second filter component includes a first inlet groove extending from a first open end of the other one of the first filter component and the second filter component away from the first open end in a first axial direction, a ramp portion extending from the first inlet groove in the first axial direction and in a circumferential direction, a circumferential portion extending from the ramp portion in the circumferential direction, and a first pawl notch, wherein the first pawl notch extends from the circumferential portion in the first axial direction to an end axially farthest from the first open end, and the first groove terminates at the end in the first axial direction. 2 . The method of claim 1 , wherein the first filter component or the second filter component is rotated until the first tab reaches a stop or detent notch. 3 . The method of claim 2 , wherein the first tab slides upward or downward in the detent notch.

4. The method of claim 2, further comprising attaching the first filter component or the second filter component to a third filter component thereby providing a seal.

5. The method of claim 2, further comprising rotating the first filter component or the second filter component until the second tab slides along the ramp portion of the second slot to a circumferential portion of the second slot, and continuing until the second tab reaches a second stop or a second detent notch. The method of claim 5 , wherein the second tab slides upward or downward in the second detent notch.

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