Two-stage fluid filter

Details Two-stage fluid filter Two-stage fluid filter

1974-08-29

1976-08-17

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210314, 210318, 210440, 210443, 210DIG17, B01D 3704

Patent

active

039752739

ABSTRACT:
A two-stage fluid filter such as an automotive oil filter. The two-stages of filtering media are mounted inside a conventional cylindrical housing forming fluid inlet and outlet ports in one end thereof. One stage of the filtering media comprises an annular depth type filtering medium having a radially outer surface in fluid communication with the inlet port, and a radially inner surface in fluid communication with the outlet port so that fluid can flow from the inlet port to the outlet port by flowing radially through the depth type medium. The second stage of the filtering media comprises a spirally wound surface type filtering medium, such as filter paper, with alternate pairs of opposed surfaces of the spiral winding bonded to each other along the circumferential edges at one longitudinal end of the spiral winding. The intervening pairs of opposed surfaces in the spiral winding are bonded to each other along the circumferential edges at the other longitudinal end of the spiral winding, so that the spaces between the intervening pairs of opposed surfaces are open at one longitudinal end and spaces between the alternate pairs of opposed surfaces are open at the other longitudinal end. The spiral winding has one longitudinal end in fluid communication with the inlet port and the other longitudinal end in fluid communication with the outlet port so that fluid can flow from the inlet port to the outlet port by flowing axially through the spiral winding. The filter paper used to form the spiral winding is preferably of a lighter weight and lower porosity than the paper conventionally used in oil filters, and provides a larger surface area in the spiral winding, although the spiral winding occupies no greater volume than a conventional pleated paper filter element.

REFERENCES:
patent: 2098725 (1937-11-01), Hurn
patent: 2599604 (1952-06-01), Bauer et al.
patent: 2868383 (1959-01-01), Nicolls
patent: 3586171 (1971-06-01), Offer
patent: 3722696 (1973-03-01), Dwyer et al.
patent: 3759391 (1973-09-01), Dreher

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