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Combination filter arrangment and method

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Combination filter arrangment and method


A cartridge type filter is mounted in a housing and is serviced through the top of the housing. The cartridge includes first and second media packs axially stacked. The second media pack is in series behind the first media pack, and filters a portion of the liquid therethrough. The second media pack has a higher efficiency than the first media pack. The overall design has a drain system which allows liquid to drain from the interior of the filter housing and back to the sump before the filter cartridge is completely removed from the housing. Other optional features include an oil cooler, various valving, and a filter cartridge lockout mechanism.

Browse recent Donaldson Company, Inc. patents - Minneapolis, MN, US
Inventors: John R. Hacker, Bradley S. HONERMANN, Mark S. Emery
USPTO Applicaton #: #20120292240 - Class: 210181 (USPTO) - 11/22/12 - Class 210 
Liquid Purification Or Separation > With Heater Or Heat Exchanger >Flow Line Connected In Series With Distinct Separator

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The Patent Description & Claims data below is from USPTO Patent Application 20120292240, Combination filter arrangment and method.

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This application is being filed on 30 Jul. 2012, as a Continuation of U.S. Ser. No. 12/864,369, filed 5 Nov. 2010 which is a National Stage of PCT/US2009/031677, filed 22 Jan. 2009 in the name of Donaldson Company, Inc., a U.S. national corporation, applicant for the designation of all countries except the US, and John R. Hacker, Bradley S. Honermann, and Mark Emery, all citizens of the U.S., applicants for the designation of the US only, and claims priority to U.S. Provisional patent application Ser. No. 61/023,296, filed 24 Jan. 2008. To the extent appropriate, a claim of priority is made to each of the above disclosed applications.

TECHNICAL FIELD

This disclosure relates to filtration. In particular, this disclosure relates to filtration of fluid, such as oil or other lubricant for use with, for example, internal combustion engines.

BACKGROUND

Internal combustion engines use various types of filters in order to reduce overall engine component wear. In particular, a filter is used to remove much of the contaminant found in engine oil or created as part of engine operation. On certain diesel engines, two oil filters are used to improve the effectiveness of the filter on removing contaminant.

FIG. 1 shows a prior art system. In FIG. 1, a first filter 200 is located in the system such that the majority of the oil used to lubricate the moving parts passes through it. A second oil filter 202 is located just upstream of this first filter 200. The second oil filter 202 allows the remaining amount of oil to flow through it and directly into the engine oil reservoir (sump) 204. The second filter 202 is more efficient than the first filter 200, which also means that it is more restrictive to oil flow and acts to continuously clean the oil in the reservoir 204. The net effect is obtaining a higher cleanliness level in the oil without the impact of a high pressure drop across the first filter 200.

In certain prior art systems, the approach of FIG. 1 requires two separate filters 200, 202 installed in their own individual housings. This can be inconvenient, occupy too much space, and cause excessive use of housing materials. In these prior art systems, the second filter 202 is in parallel with the first filter 200 and is exposed to the same level of contaminant as the first filter 200. Further, these filters are often a part of a spin-on filter design. Improvements are desirable.

SUMMARY

A filter cartridge assembly is provided including a first media pack and a second media pack. A center endcap is between the first media pack and the second media pack; the center endcap has a wall defining a bore. The first media pack is secured to the center endcap, and the second media pack is secured to the center endcap. The wall of the center endcap defines a slot arrangement, which provides communication between the bore and a region outside of the center endcap.

In another aspect, a filter assembly is provided including a filter cartridge, as characterized above, a base assembly, and a cover. The base assembly includes a base housing defining an interior. The filter cartridge is operably and removably mounted in the interior of the base housing. The cover is removably oriented on the base housing. The cover is selectively removable to allow access to the interior of the base housing and access to the removable filter cartridge.

In another aspect, a method of filtering liquid is provided. One example method includes directing a first stream of liquid through a first filter media pack to remove particulate from the first stream; after removing particulate from the first stream by the first filter media pack, directing some of the volume of the first stream through a filtered liquid port to downstream components and directing the remaining portion of the volume through a second filter media pack to remove particulate and provide a second stream; the second media pack being part of a same cartridge as the first media pack; and after removing particulate from the remaining portion through the second filter media pack, directing the second stream to a liquid sump.

In another aspect, a method of servicing a filter assembly is provided. The method includes providing a filter assembly, as characterized above; removing the cover from the base housing; removing the filter cartridge from the base housing; operably installing a new filter cartridge as characterized above in the base housing; and putting the cover onto the base housing.

Example overall designs may optionally include a drain system that allows liquid to drain from the interior of the filter housing and back to the sump before the filter cartridge is completely removed from the housing. Other optional features include an oil cooler, various valving, and a filter cartridge lockout mechanism.

Not all the features described herein must be incorporated in an arrangement for the arrangement to have some selected advantage, according to the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a prior art filter system;

FIG. 2 is a schematic view of a filter system constructed in accordance with principles of this disclosure;

FIG. 3 is an exploded, perspective view of a filter assembly constructed in accordance with principles of this disclosure;

FIG. 4 is a perspective view of the filter assembly of FIG. 3, assembled for operative use;

FIG. 5 is a perspective view of a filter cartridge usable in the filter assembly of FIGS. 3 and 4;

FIG. 6 is another perspective view of the filter cartridge of FIG. 5;

FIG. 7 is an exploded, perspective view of an endcap usable in the filter cartridge of FIGS. 5 and 6;

FIG. 8 is an exploded, perspective view of an endcap usable in the filter cartridge of FIGS. 5 and 6;

FIG. 9 is an exploded, perspective view of an endcap usable in the filter cartridge of FIGS. 5 and 6;

FIG. 10 is an exploded, perspective view of a cover assembly constructed in accordance with principles of this disclosure;

FIG. 11 is a perspective view of the cover depicted in FIG. 10;

FIG. 12 is an exploded, perspective view of a base assembly constructed in accordance with principles of this disclosure;

FIG. 13 is an exploded, perspective view of internal components within the base assembly of FIG. 12;

FIG. 14 is a cross-sectional view of the filter assembly of FIG. 4, the cross-section being taken along the line 14-14 of FIG. 15;

FIG. 15 is a side-elevational view of the filter assembly of FIG. 4;

FIG. 16 is a cross-sectional view of a portion of the filter assembly showing flow paths of fluid through a port assembly, which is part of the base assembly, the cross-section being taken along the line 16-16 of FIG. 17;

FIG. 17 is a side-elevational view of the filter assembly of FIG. 4;

FIG. 18 is a cross-sectional view of the filter assembly of FIG. 4 and showing flow paths therethrough, the cross-section being taken along the line 18-18 of FIG. 19;

FIG. 19 is a side-elevational view of the filter assembly of FIG. 4;

FIG. 20 is a cross-sectional view of the filter assembly of FIG. 4 and showing flow paths therethrough, the cross-section being taken along the line 20-20 of FIG. 21;

FIG. 21 is a side-elevational view of the filter assembly of FIG. 4;

FIG. 22 is a cross-sectional view of the filter assembly showing flow paths therethrough, the cross-section being taken along the line 22-22 of FIG. 23;

FIG. 23 is a side-elevational view of the filter assembly of FIG. 4;

FIG. 24 is a cross-sectional view showing the base assembly with the cover and cartridge assembly removed and depicting drainage, constructed according to principles of this disclosure, the cross-section being taken along the line 24-24 of FIG. 25;

FIG. 25 is a side elevational view of the base assembly with the cover and cartridge assembly removed;

FIG. 26 is a cross-sectional view of the filter cartridge assembly of FIG. 4;

FIG. 27 is an enlarged, perspective, cross-sectional view of a portion of the filter cartridge assembly of FIG. 26;

FIG. 28 is an enlarged, perspective, cross-sectional view of a portion of the filter cartridge assembly of FIG. 26;

FIG. 29 is an exploded, perspective view of another embodiment of internal components for use in a filter assembly, constructed in accordance with principles of this disclosure; and

FIG. 30 is a cross-sectional view of a filter assembly utilizing the internal components of FIG. 29, the cross-section being analogous to the cross-section of FIG. 14.

DETAILED DESCRIPTION

In one aspect, an improvement to the prior art system of FIG. 1 is to locate the second, more efficient filter downstream of the first filter, rather than in parallel with the first filter. This way, the second filter will be exposed to fewer and smaller contaminant particles, extending the life of the second filter. Only a small amount of additional media is needed in the first filter to compensate for the small increase in flow through the first filter that was normally going through the first filter. In another aspect, another improvement to the FIG. 1 design is to provide a bowl-cartridge assembly, rather than utilizing the spin-on filter cartridge design. Utilizing the bowl-cartridge assembly will eliminate the need to dispose of the spin-on housing each time the filter is serviced. In a bowl-cartridge assembly, only the cartridge is replaced. There are additional, separate, and independent improvements in the design as characterized herein.

In FIG. 2, an improved system in accordance with principles of this disclosure is shown. For purposes of clarity, not all of the reference numerals are shown in every figure. In FIG. 2, a first filter is illustrated schematically at 210, while a second filter 212 is provided in serial, rather than in parallel, to the first filter 210. As can be seen in the system of FIG. 2, after fluid, such as oil, flows through the first filter 210, a portion of it flows to downstream engine components 214, while a remaining portion flows through the second filter 212. The portion that flows through the second portion 212 is returned to the engine sump 216.

Attention is directed to FIGS. 3 and 4, which illustrate one embodiment of a filter assembly 1 constructed in accordance with principles of this disclosure. In the embodiment shown, the filter assembly 1 includes a base assembly 2 and a cover/cartridge assembly 3. The cover/cartridge assembly 3 is removable from the filter assembly 1 during servicing. The cover/cartridge assembly 3 includes a cover 21 and a filter cartridge assembly 5. The filter cartridge assembly 5 is replaced during servicing.

In FIGS. 5 and 6 are further views of the filter cartridge assembly 5. The cartridge assembly 5 includes the first filter 210, which has a first media pack 6, and the second filter 212, which has the second media pack 7. In this particular example, the first media pack 6 and the second media pack 7 are separated by a center endcap 8. In the embodiment shown, the first media pack 6 has a tubular shape and defines a first open interior volume 250 (FIG. 14). The first media pack 6 further has a first end 251 and a second opposite end 252. Preferably, the first media pack 6 is cylindrical in construction and can be made from a variety of types of media including, for example, pleated media, such as pleated cellulose. As can be appreciated from FIGS. 5 and 6, the first filter 210 and the second filter 212 are part of a common, integrally formed filter cartridge 5. That is, the first filter 210 cannot be removed independently of the second filter 212, and vice-versa.



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stats Patent Info
Application #
US 20120292240 A1
Publish Date
11/22/2012
Document #
13561756
File Date
07/30/2012
USPTO Class
210181
Other USPTO Classes
210252, 210256
International Class
/
Drawings
19



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