Liquid purification or separation – Flow – fluid pressure or material level – responsive – Discharge of treated material
Patent
1997-12-29
1999-11-23
Walker, W. L.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Discharge of treated material
210116, 210137, 210196, 2104164, 210429, 210439, 210446, B01D 2988
Patent
active
059894130
DESCRIPTION:
BRIEF SUMMARY
The invention relates to fuel filters, each with an integrated pressure regulating valve as claimed in the preambles of patent claims 9, 14 and 15.
Fuel circulated from a fuel tank here means that the fuel is conveyed, by means of a pump, out of a fuel tank to the fuel injection locations, in each case more fuel being conveyed than injected. The excess fuel conveyed is returned to the tank. The pressure regulating valve of the generic type is provided in the circulation line and is intended to ensure a uniformly high pressure at the injection locations.
DE 44 30 852 U1 has disclosed a fuel filter with a pressure regulating valve, which comprises a filter pot which can be closed by a cover and has an annular filter element provided in it, through which flow takes place from the outside, radially, to the inside, radially, in which filter fuel flows in and out through main-flow connections provided on opposite end sides of the filter. Furthermore, in this device a recirculation connection, which is arranged centrally, is provided for the fuel to be recirculated. Furthermore, the pressure regulating valve is integrated in an end-wall region of the filter housing and is arranged in the axis of the filter, where it is acted on by the cleaned fuel.
DE 34 46 325 A1 has disclosed a fuel feed system with a pressure regulating valve which operates against atmospheric pressure, in which system the pressure regulating valve is not integrated in the housing of the fuel filter. This design is expensive to produce and has a multiplicity of components which are to be connected together using lines which are in some cases very long.
A fuel filter having the generic features of claims 9 and 15 is known from EP 0 702 142, and a fuel filter of this type having the generic features of claim 14 is known from DE 94 14 297.
Against this background, the invention concerns itself with the problem of providing fuel filters of the generic type with an integrated pressure regulating valve which operates against atmospheric pressure and has a structurally simple and economically producible design.
The characterizing features of patent claims 9, 14 and 15 provide advantageous solutions to this common problem. Expedient configurations of the teaching of claim 9 form the subject matter of claims 10 to 13. The characterizing features of claims 12 and 13 simultaneously form advantageous configurations of the fuel filters having the generic features of claim 14 and/or claim 15.
Exemplary embodiments of the invention explained below are illustrated in the drawing, in which:
FIG. 1 shows a longitudinal section through a fuel filter with integrated pressure regulating valve,
FIG. 2 shows an alternative design of the fuel filter, illustrated as in FIG. 1.
A fuel filter is designed as a filter pot 2 which is closed by a cover 1. In the filter pot 2 is situated an annular filter element 3, which is arranged coaxially and through which fuel flows from the outside to the inside. To form a crude and a clean chamber inside the filter, the annular filter element 3 is covered at its axial ends with impermeable, annular end disks 4 and 5. By means of the end disk 5 which is situated at the bottom in the drawing, the filter element 3 bears in a radially sealed manner against a connection 6 which protrudes from the housing into the interior of the filter pot 2. A space through which flow can take place remains radially on the outside between the end disk 5 and the housing of the filter pot 2.
The end disk 4 which is situated at the top in the drawing is sealed radially on the outside with respect to the wall of the filter pot 2. As a result, a chamber, which adjoins the annular filter element 3 radially on the outside, inside the filter pot 2 is separated as a crude chamber 7 from a clean chamber 8 situated centrally inside the annular filter element 3. A feed connection 9, which opens out at the lower end side of the filter pot and through which fuel flows into the filter, leads into the crude chamber 7.
A discharge connection 10, which is situated at that
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Jauss Stefan
Mauz Lothar
Schiffer Walter
Schrepfer Jurgen
Triffterer Adolf
Daimler-Chrysler AG
Fleming Michael
Knecht Filterwerke
Walker W. L.
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