Self-cleaning fluid filter with a drain

Details Self-cleaning fluid filter with a drain Self-cleaning fluid filter with a drain

1983-08-19

1986-04-08

Fisher, Richard V.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Filter cleaning

210133, 210411, 2104164, 210427, 210430, 55218, 55313, 55314, 55303, B01D 2710

Patent

active

045811350

ABSTRACT:
A self-cleaning renewable fluid filter that flushes a permanent filter media while the used oil is pumped out by the engine oil pump through a drain in the housing. The fluid filter has an inlet and a drain, a center core with an outlet, a drain valve normally closing the drain, a permanent fluid filter media inbetween the inlet and outlet, a plug for closing the outlet, an actuator for opening the drain valve and an improved bypass valve which bypasses fluid and enables reversal of fluid flow through the filter media during draining for flushing the media. The preferred drain valve actuator is an electric solenoid coil inside of the filter and the improved bypass valve is an annular valve around the center core and inside of a cylinder formed in an inlet end cap of the filter media. The used oil is pumped out the drain after it has passed through the media in a reversed direction, while the engine is idling, until the engine oil sump is evacuated and the ensuing air from the pump forces the oil out of the filter housing.

REFERENCES:
patent: 3004670 (1961-10-01), Zonker
patent: 3142640 (1964-07-01), Otto, Jr.
patent: 3235085 (1966-02-01), Humbert, Jr.
patent: 3618775 (1971-11-01), Hultgren
patent: 3948773 (1976-04-01), Tucker
patent: 4053405 (1977-10-01), Dekeyser et al.
patent: 4090962 (1978-05-01), Braukmann
patent: 4284500 (1981-08-01), Keck
patent: 4295963 (1981-10-01), Drori
patent: 4427542 (1984-01-01), Glover

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