Diaphragm pump

Gas and liquid contact apparatus – Fluid distribution – Pumping

Patent

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Details

417386, 417395, F02M 708

Patent

active

041995350

ABSTRACT:
A diaphragm pump operated by vacuum pressure and having a switching arrangement to control the continuous alternations between the intake stroke caused by vacuum pressure and the working stroke caused during venting by a spring after the end of each stroke. The switching arrangement consists of a crack-open valve between vacuum pressure chamber and a space continually connected to atmosphere, and a plunger, fastened to the diaphragm; the length of the plunger is variable through a spring clutch. The special action of the switching arrangement is based on the fact that the plunger requires a larger force for cracking the valve than afterwards for keeping it open. This is accomplished by having a differential pressure, act in the closing direction on the valve, and eliminating this force after opening, causing the spring-loaded plunger to extend to its full length and to keep open the valve during the entire working stroke of the diaphragm.

REFERENCES:
patent: 1268780 (1918-06-01), Jay
patent: 2092482 (1937-09-01), Timian
patent: 2494529 (1950-01-01), Wirtanen
patent: 2552261 (1951-05-01), Coughlin
patent: 2919650 (1960-01-01), Wiggermann
patent: 3162324 (1964-12-01), Houser
patent: 3421448 (1969-01-01), Brewer et al.
patent: 3429274 (1969-02-01), Nilsson
patent: 3955901 (1976-05-01), Hamilton
patent: 4110058 (1978-08-01), Langle et al.

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