CA1127093A - Fuel filter with fuel and air filtering medias - Google Patents
Fuel filter with fuel and air filtering mediasInfo
- Publication number
- CA1127093A CA1127093A CA324,772A CA324772A CA1127093A CA 1127093 A CA1127093 A CA 1127093A CA 324772 A CA324772 A CA 324772A CA 1127093 A CA1127093 A CA 1127093A
- Authority
- CA
- Canada
- Prior art keywords
- fuel
- filter
- chamber
- fuel line
- filtering medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
FUEL FILTER WITH FUEL AND AIR FILTERING MEDIA
ABSTRACT OF THE DISCLOSURE
A fuel filter for an internal combustion engine having dual filtering medias such that one will filter fuel and the other will allow air to permeate the filter and thereby purge the fuel line of air entrained in the fuel.
ABSTRACT OF THE DISCLOSURE
A fuel filter for an internal combustion engine having dual filtering medias such that one will filter fuel and the other will allow air to permeate the filter and thereby purge the fuel line of air entrained in the fuel.
Description
FUEL FI~TER WITH FUEL AND AIR FILTERING MEDIA
This invention relates to a fuel filter and more particularly to a fuel filter in the f~el line of an internal combustion engine having dual filtering media to provide normal filtering of the fuel and a portion which allows air to permeate the filter to purge the fuel line of air entrained in the fuel which is normally trapped because it is repelled by the filter which is wetted by the fuel oil.
Fuel filters in the fuel line of an internal combustion engine normally fitler the fuel and water carried by the fuel, being heavier than the fuel oil, will seek a lower level in the filter assembly. Normally a trap is provided for the water which will settle into a sediment bulb which can be removed from time to time to remove the water from the fuel line. Air, however, is also entrained in the fuel oil to a greater or lesser degree and air can sometimes present a problem since it will not penetrate a filter wetted by the fuel oil. Since the filter wetted by fuel oil is highly resistant to air passage, a second filtering medium is positioned so that it will allow air to pass through the filter and thereby purge the system of trapped air and allow the filter to operate normally.
It is an object of this invention to provide a dual filtering media on a fuel filter in a fuel line of an internal combustion engine.
It is another object of this invention to provide a dual filter on a fuel line filter for an interal combustion engine for filtering fuel and allowing air to permeate the filter for normal operation of the filter.
It is a further object of this invention o provide dual filtering media on a fuel line filter for an internal combustion engine to allow filtering of the fuel and purging of the air trapped in the fuel line for normal filtering in the fuel line.
- ~270~
The objects of this invention are accomplished by use of a filter in the fuel line of an internal combustion engine in which dual filtering media are provided. A fuel filtering medium filters the fuel as the fuel flows in and out of the filter ~ssembly. The filtering medium normally resists the flow of air through the filtering medium and accordingly a second medium is provided which will allow the air to permeate the filter and thereby purge the uel line of air trapped in the fuel. The second medi~m can be provided by treating a portion of the filter in a manner that the air will permeate the medi~m to provide a self-purging system of the fuel line. This will prevent the air from building up in the filter assembly and avoid possible failure of the filter in the fuel line. The second filter medium which allows the air to permeate the medium may be a dissimilar filtering material such as sintered metal, felt, plastic or other material which will not repell the flow of air through the filter element in the fuel line.
In accordance with the invention, a fuel line and filter comprising, a fuel line in an internal combustion engine, a filter housing defining a fuel inlet passage connected to said fuel line, said filter housing defining a fuel outlet passage connected to said fuel line, said filter housing defining a filter chamber receiving a filter element, means sealing said filter element of its ~pper and lower ends with said housing, said filter housing and filter eleme~t defining an unfiltered fuel chamber in communication with said inlet passage, a filtered fuel 3~ chamber in communication with said outlet passa~e, said filter element including a first filtering medium filtering fuel as it flows from said unfiltered fuel chamber to said filtered fuel chamber, a second filtering medium at the upper end of said filter element permitting air to permeate the second filtering medium at the upper end of said filter element to operate as a ~elf-purging filtering device of air eising to the top of said unfiltered fuel chamber.
7~ 3 Referring ~o the drawings, the preferred embodiment of this invention is illustrated.
Fig. 1 illustrates a cross section view of the filter assembly in a fuel line system of an internal combustion engine;
Fig. 2 illustrates a cross section view taken on line II~ f Fig. l; and Fig. 3 illustrates an enlarged view of the filtering media taken on line III-III of Fig. 2.
Referring to the drawings, Fig. 1 shows an engine 1 with fuel injectors 2 connected to the fuel lines 4 and manifold 30 drains fuel to the fuel tank 7. The fuel injection pump 5 normally pressurizes the fuel Eor the fuel injection and a fuel line pump 6 drawing fuel from the fuel tank 7 supplies fuel to the fuel line filter 8. The fuel conduit 9 supplies fuel to the passage 10 in housing 11.
The passage 10 supplies fuel to the peripheral chamber 12 which surrounds the filter element 13 in the filter chamber 14. Filter element retainer ]5 receives the filter element
This invention relates to a fuel filter and more particularly to a fuel filter in the f~el line of an internal combustion engine having dual filtering media to provide normal filtering of the fuel and a portion which allows air to permeate the filter to purge the fuel line of air entrained in the fuel which is normally trapped because it is repelled by the filter which is wetted by the fuel oil.
Fuel filters in the fuel line of an internal combustion engine normally fitler the fuel and water carried by the fuel, being heavier than the fuel oil, will seek a lower level in the filter assembly. Normally a trap is provided for the water which will settle into a sediment bulb which can be removed from time to time to remove the water from the fuel line. Air, however, is also entrained in the fuel oil to a greater or lesser degree and air can sometimes present a problem since it will not penetrate a filter wetted by the fuel oil. Since the filter wetted by fuel oil is highly resistant to air passage, a second filtering medium is positioned so that it will allow air to pass through the filter and thereby purge the system of trapped air and allow the filter to operate normally.
It is an object of this invention to provide a dual filtering media on a fuel filter in a fuel line of an internal combustion engine.
It is another object of this invention to provide a dual filter on a fuel line filter for an interal combustion engine for filtering fuel and allowing air to permeate the filter for normal operation of the filter.
It is a further object of this invention o provide dual filtering media on a fuel line filter for an internal combustion engine to allow filtering of the fuel and purging of the air trapped in the fuel line for normal filtering in the fuel line.
- ~270~
The objects of this invention are accomplished by use of a filter in the fuel line of an internal combustion engine in which dual filtering media are provided. A fuel filtering medium filters the fuel as the fuel flows in and out of the filter ~ssembly. The filtering medium normally resists the flow of air through the filtering medium and accordingly a second medium is provided which will allow the air to permeate the filter and thereby purge the uel line of air trapped in the fuel. The second medi~m can be provided by treating a portion of the filter in a manner that the air will permeate the medi~m to provide a self-purging system of the fuel line. This will prevent the air from building up in the filter assembly and avoid possible failure of the filter in the fuel line. The second filter medium which allows the air to permeate the medium may be a dissimilar filtering material such as sintered metal, felt, plastic or other material which will not repell the flow of air through the filter element in the fuel line.
In accordance with the invention, a fuel line and filter comprising, a fuel line in an internal combustion engine, a filter housing defining a fuel inlet passage connected to said fuel line, said filter housing defining a fuel outlet passage connected to said fuel line, said filter housing defining a filter chamber receiving a filter element, means sealing said filter element of its ~pper and lower ends with said housing, said filter housing and filter eleme~t defining an unfiltered fuel chamber in communication with said inlet passage, a filtered fuel 3~ chamber in communication with said outlet passa~e, said filter element including a first filtering medium filtering fuel as it flows from said unfiltered fuel chamber to said filtered fuel chamber, a second filtering medium at the upper end of said filter element permitting air to permeate the second filtering medium at the upper end of said filter element to operate as a ~elf-purging filtering device of air eising to the top of said unfiltered fuel chamber.
7~ 3 Referring ~o the drawings, the preferred embodiment of this invention is illustrated.
Fig. 1 illustrates a cross section view of the filter assembly in a fuel line system of an internal combustion engine;
Fig. 2 illustrates a cross section view taken on line II~ f Fig. l; and Fig. 3 illustrates an enlarged view of the filtering media taken on line III-III of Fig. 2.
Referring to the drawings, Fig. 1 shows an engine 1 with fuel injectors 2 connected to the fuel lines 4 and manifold 30 drains fuel to the fuel tank 7. The fuel injection pump 5 normally pressurizes the fuel Eor the fuel injection and a fuel line pump 6 drawing fuel from the fuel tank 7 supplies fuel to the fuel line filter 8. The fuel conduit 9 supplies fuel to the passage 10 in housing 11.
The passage 10 supplies fuel to the peripheral chamber 12 which surrounds the filter element 13 in the filter chamber 14. Filter element retainer ]5 receives the filter element
2~ 13 which is pressed upwardly by the filter seat 16 as the filter casing 17 is fastened to the filter support 18 of the housing 11. A central chamber 19 within the filter element 13 receives filtered fluid as it passes through the filter element 13. The radial passages 20 in the central conduit 21 transmit the fuel to the conduit 22 which is connected to the outlet fuel line 23 and pump 5. Fuel is then pumped to the fuèl injectors 2 of the engine 1.
The filter element 13, as shown, is made of a pleated paper seated in the filter chamber for filtering of the fuel. The filtering medium 25 provides normal filtering of the fuel oil as the filter is in operation in the fuel line. The second filtering medium 2S ma~ be a specially treated portion of the fil~er paper which allows air to permeate the filter element to provide a self-purging means for relieving trapped air in the fitler chamber. This will allow air to pass through the fuel line to the engine 1 and prevent air from building up and impeding normal filtering operations.
~7al~3 The ~iltering medium 25 is a suitable medium normally used for filtering fuel oil in an internal co~nb~stion engine. The fitering medium 26 is a special filtering medium which accommodates permeation of the medium b~ the air to purge the fuel line. Such a medium may be achieved by treating a paper with chemicals which will allow the air to permeate the medium 26. Other media such as sintered metal, felt, or plastic will also provide air passaye and would not be affected by wetting of the fuel oil to repell permeation of air through the filter.
The operation of the device will be described in the following paragraphs.
The fuel pump 6 normally operates to draw fuel from the fuel tank and force the fuel to flow to the filter assembly 8. The fuel in the filter assembly 8 flows to the peripheral chamber 12 and is then filtered by the filter element 13. Normally the filtered fuel passes through the filter element 13 to the filtered fuel chamber 14 and then through conduit 22 to the fuel injection pump 5. Fuel is then delivered to the fuel lines 4 and to the fuel injectors on the engine.
The manifold 30 permits excess fuel to return to the fuel tank. In the proce~s of filtering fuel in the filter assembly 8, water settling to the bottom of the filter assembly can be drained through the petcock 31. Air entrained in the peripheral chamber 12 normally repelled by the filtering medium 25 is allowed to permeate the filtering medium 26 and pass through to the central filtered fuel chamber 14. The fuel then pa~ses through the conduit 23 and to the fuel injection pump 5. The use of the second medium which allows air to permeate the filter element 13 operates as the self-purging device for purging of trapped air from the fuel line and allows a normal filtering operation.
The filter element 13, as shown, is made of a pleated paper seated in the filter chamber for filtering of the fuel. The filtering medium 25 provides normal filtering of the fuel oil as the filter is in operation in the fuel line. The second filtering medium 2S ma~ be a specially treated portion of the fil~er paper which allows air to permeate the filter element to provide a self-purging means for relieving trapped air in the fitler chamber. This will allow air to pass through the fuel line to the engine 1 and prevent air from building up and impeding normal filtering operations.
~7al~3 The ~iltering medium 25 is a suitable medium normally used for filtering fuel oil in an internal co~nb~stion engine. The fitering medium 26 is a special filtering medium which accommodates permeation of the medium b~ the air to purge the fuel line. Such a medium may be achieved by treating a paper with chemicals which will allow the air to permeate the medium 26. Other media such as sintered metal, felt, or plastic will also provide air passaye and would not be affected by wetting of the fuel oil to repell permeation of air through the filter.
The operation of the device will be described in the following paragraphs.
The fuel pump 6 normally operates to draw fuel from the fuel tank and force the fuel to flow to the filter assembly 8. The fuel in the filter assembly 8 flows to the peripheral chamber 12 and is then filtered by the filter element 13. Normally the filtered fuel passes through the filter element 13 to the filtered fuel chamber 14 and then through conduit 22 to the fuel injection pump 5. Fuel is then delivered to the fuel lines 4 and to the fuel injectors on the engine.
The manifold 30 permits excess fuel to return to the fuel tank. In the proce~s of filtering fuel in the filter assembly 8, water settling to the bottom of the filter assembly can be drained through the petcock 31. Air entrained in the peripheral chamber 12 normally repelled by the filtering medium 25 is allowed to permeate the filtering medium 26 and pass through to the central filtered fuel chamber 14. The fuel then pa~ses through the conduit 23 and to the fuel injection pump 5. The use of the second medium which allows air to permeate the filter element 13 operates as the self-purging device for purging of trapped air from the fuel line and allows a normal filtering operation.
Claims (10)
1. A fuel line and filter comprising, a fuel line in an internal combustion engine, a filter housing defining a fuel inlet passage connected to said fuel line, said filter housing defining a fuel outlet passage connected to said fuel line, said filter housing defining a filter chamber receiving a filter element, means sealing said filter element of its upper and lower ends with said housing, said filter housing and filter element defining an unfiltered fuel chamber in communication with said inlet passage, a filtered fuel chamber in communication with said outlet passage, said filter element including a first filtering medium filtering fuel as it flows from said unfiltered fuel chamber to said filtered fuel chamber, a second filtering medium at the upper end of said filter element permitting air to permeate the second filtering medium at the upper end of said filter element to operate as a self-purging filtering device of air rising to the top of said unfiltered fuel chamber.
2. A fuel line and filter as set forth in claim 1 wherein said filtering media define dissimilar materials.
3. A fuel line and filter as set forth in claim 1 wherein said second filtering medium includes a material treated chemically to prevent wetting by the fuel from repelling passage of the air.
4. A fuel line and filter as set forth in claim 1 wherein said second filtering medium includes sintered metal.
5. A fuel line and filter as set forth in claim 1 wherein said second filtering medium includes a plastic for allowing air to permeate said second filtering medium.
6. A fuel line and filter as set forth in claim 1 wherein said second filtering medium includes a felt for allowing air to permeate said second filtering medium.
7. A fuel line and filter as set forth in claim 1 wherein said filter element defines a pleated paper, the second filtering medium includes a chemically treated upper portion permitting air to permeate said upper portion.
8. A fuel line and filter as set forth in claim 1 including, means positioning said second filtering medium at the upper end of said filter element.
9. A fuel line and filter as set forth in claim 1 wherein said unfiltered fuel chamber defines a peripheral inlet chamber, said filter fuel chamber defines a central fuel chamber in communication with said outlet passage.
10. A fuel line and filter as set forth in claim 1 wherein said filter housing defines a cylindrical axially vertical configuration, a peripheral chamber in communication with said inlet passage defining said unfiltered chamber, a centrally aligned outlet chamber defining said filtered fuel chamber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US93826078A | 1978-08-30 | 1978-08-30 | |
| US938,260 | 1978-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1127093A true CA1127093A (en) | 1982-07-06 |
Family
ID=25471182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA324,772A Expired CA1127093A (en) | 1978-08-30 | 1979-04-03 | Fuel filter with fuel and air filtering medias |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1127093A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5380432A (en) * | 1993-05-13 | 1995-01-10 | Parr Manufacturing, Inc. | Fuel filter with electrostatic charge preventing media |
-
1979
- 1979-04-03 CA CA324,772A patent/CA1127093A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5380432A (en) * | 1993-05-13 | 1995-01-10 | Parr Manufacturing, Inc. | Fuel filter with electrostatic charge preventing media |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |