Permanent backwashable filter structure

Details Permanent backwashable filter structure Permanent backwashable filter structure

1992-06-17

1993-04-20

Theisen, Mary Lynn

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

210487, 2104931, 21032177, 21032186, B01D 2706

Patent

active

052039986

ABSTRACT:
A liquid-cleaning filtering system with distillation capability has twin permanent filter assemblies, each utilizing a wire mesh filter cartridge which is backwashed using an internal sprayer nozzle assembly. During the normal operation of the filter cartridge, which is located in a pressurizable inverted bell housing, contaminates are filtered through a sheet of wire mesh arranged in a star configuration on a frame structure within the filter cartridge. The liquid filtering system is especially adapted for use in dry cleaning operations where a layer of diatomaceous earth and a layer of activated carabon deposited are on the wire mesh at the start of normal forward flow. Contaminates collect on this filter bed, thus cleaning the dry cleaning solvent. During the system's backwash cycle, filtered solvent previously collected in a steel reservoir is pressurized to provide a powerful head of pressure for backflushing each filter cartridge through its own sprayer nozzle assembly which reciprocates inside the cartridge. The high-pressure spray vigorously cleans the wire mesh of all suspended contaminants and filter bed particles. The backflushed dry cleaning solvent is directed to the distillation system which separates the solvent from the contaminants by the evaporation method.

REFERENCES:
patent: 2907408 (1959-10-01), Engle et al.
patent: 3022861 (1962-02-01), Harms
patent: 3647071 (1972-03-01), Lamort
patent: 4186099 (1980-01-01), Henschel, Jr. et al.
patent: 4552657 (1985-11-01), Ogawa
patent: 4588464 (1986-05-01), Miyagi et al.
patent: 4735720 (1988-04-01), Kersting
patent: 4954255 (1990-09-01), Muller et al.
patent: 5104534 (1992-04-01), Branchcomb

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