Filter arrangement

Details Filter arrangement Filter arrangement

2000-08-28

2001-12-11

Savage, Matthew O. (Department: 1723)

Liquid purification or separation

Diverse distinct separators

Including a filter

C210S313000, C210S436000, C210S440000, C210S472000, C210S497010

Reexamination Certificate

active

06328889

ABSTRACT:

This invention relates to a filter for use in removing contaminants from a supply of fuel to an engine, the filter being particularly suitable for use in filtering contaminants from a supply of diesel for a compression ignition internal combustion engine.
In a known filter arrangement, a pleated filter member is located within a substantially cylindrical housing. The filter member is folded so that, in cross-section, the filter member is of star-like form. An axially extending perforated tube is located within the housing, the tube being arranged to receive fuel from a fuel tank. In use, fuel flows from the fuel tank to the axially extending tube. The fuel passes through the perforations of the tube to the filter member. The filter member prevents continued movement of contaminants carried by the fuel whilst permitting the fuel to pass through the filter member to a chamber adjacent in inner surface of the housing wall. The filtered fuel can then flow to an outlet from where it is supplied to a high pressure fuel pump. A suitable pump may be located either upstream or downstream of the filter to supply fuel to or draw fuel through the filter.
This type of filter arrangement may alternatively be used with fuel being supplied from the fuel tank to the chamber adjacent the housing wall, the fuel flowing in a radially inward direction through the filter member towards the axially extending tube. The clean fuel reaching the tube is then supplied to a high pressure fuel pump or other device.
The fuel supplied to the filter often carries with it a considerable amount of air. Where fuel flows from the outside of the filter member towards the axially extending tube, it is known to provide an arrangement whereby the air is collected and removed as required through a bleed outlet. Alternatively, an arrangement may be provided whereby air is allowed to continue with the flow of fuel at a controlled rate, the quantity of air permitted to flow with the fuel being sufficiently low that operation of the high pressure fuel pump or other devices downstream of the filter is not affected.
It is an object of the invention to provide a filter arrangement of the type in which fuel flows in a radially outward direction, and in which air is permitted to continue with the flow of fuel at a controlled rate.
According to the present invention there is provided a filter assembly comprising a housing, a filter member located within the housing, the housing including an inlet arranged to permit dirty fuel to be supplied to a central chamber within the filter member and an outlet arranged to permit clean fuel to be removed from an outer chamber surrounding the filter member, and a sleeve surrounding an upper part of the filter member and defining with the filter member an air collection chamber, at least one small opening being provided whereby air is permitted to flow at a controlled rate from the air collection chamber to the outer chamber.
The filter member is conveniently of generally cylindrical form.
The filter member and sleeve conveniently form part of a filter cartridge which further comprises an upper support plate and a lower support plate, the support plates being secured to one another by an axially extending tubular member, the filter member engaging the support plates to substantially prevent contaminant flow between the filter member and the support plates. The sleeve conveniently depends from the outer periphery of the upper support plate, the lower edge of the sleeve being axially spaced from the lower support plate.
The invention further relates to a filter cartridge for use in such a filter arrangement.


REFERENCES:
patent: 3272336 (1966-09-01), Humbert, Jr.
patent: 3312351 (1967-04-01), Kasten
patent: 4456529 (1984-06-01), Shinaver
patent: 4619764 (1986-10-01), Church et al.
patent: 4626348 (1986-12-01), Stone
patent: 4680110 (1987-07-01), Davis
patent: 5382361 (1995-01-01), Brun
patent: 5916442 (1999-06-01), Goodrich
patent: 0547951 (1993-06-01), None
patent: 0579484 (1994-01-01), None
patent: 0699834 (1996-03-01), None
patent: 844671 (1960-08-01), None
patent: 903505 (1962-08-01), None
patent: 2292897 (1996-03-01), None

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