Liquid purification or separation – Flow – fluid pressure or material level – responsive – Diverse sensing means
Patent
1976-12-06
1978-06-13
Granger, Theodore A.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Diverse sensing means
210108, 210138, B01D 3338
Patent
active
040947874
ABSTRACT:
The disclosed filter comprises a filter housing having a generally conical downwardly tapering bottom wall and a closed top wall. A generally conical filter medium is mounted in the housing so as to partition the housing into upper and lower compartments. Rather than being conical, the filter medium may be in the shape of a downwardly tapering inverted pyramid, having any desired number of sides, with its apex down and its base at the top of the filter medium. During the normal filtering operation, paint or some other liquid is supplied under pressure to a lower opening at the lower end of the conical bottom wall. The paint or other liquid passes upwardly through the filter medium which removes any foreign particles. The filtered liquid or filtrate then passes out of the upper compartment through an outlet pipe extending from the lower portion of the upper compartment through the top wall and out of the housing. A control valve is provided to disconnect the paint supply from the lower opening and to connect the lower opening to a drain. This valve is actuated when the filter medium is to be cleaned. To clean the filter medium, a solvent is supplied to spray means in the upper compartment, so that the solvent will pass through the filter medium into the lower compartment and out of the housing through the control valve to the drain. The paint and the solvent may be supplied by a paint supply pump and a solvent supply pump. A second control valve may be connected into the outlet pipe. Preferably, a wash cycle is initiated automatically by a pressure sensor which is operated by excess paint pressure due to clogging of the filter medium. The pressure sensor causes the operation of a control system which initiates a wash cycle so as to stop the paint supply pump, actuate the first control valve, close the second valve, and start the solvent supply pump. The control system preferably includes a timer for terminating the wash cycle so as to stop the solvent supply pump, open the second control valve, deactuate the first control valve, and start the paint supply pump.
REFERENCES:
patent: 748821 (1904-01-01), Wackeron
patent: 785522 (1905-03-01), Robinson
patent: 1843157 (1932-02-01), Have
patent: 2889048 (1959-06-01), Nordin
patent: 3061102 (1962-10-01), Mayen, Jr.
patent: 3253431 (1966-05-01), Minhinnett
patent: 3378143 (1968-04-01), Tippiz
patent: 3478883 (1969-11-01), Deluca, Jr.
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