Diaphragm pump with hydraulically driven rolling diaphragm

Details Diaphragm pump with hydraulically driven rolling diaphragm Diaphragm pump with hydraulically driven rolling diaphragm

1985-12-23

1988-06-07

Croyle, Carlton R.

Pumps

Motor driven

Fluid motor

92 98D, F04B 908, F04B 3502

Patent

active

047493429

ABSTRACT:
In a diaphragm pump with a diaphragm in the form of a rolling diaphragm that separates a delivery chamber from a fluid-filled pressure chamber and that with its peripheral edge is firmly clamped between a casing body and pump cover, and with an oscillating hydraulic piston which is displaceable in a bore of the casing body between the pressure chamber and a hydraulic reservoir, so as to actuate the diaphragm, the rolling diaphragm rolls alternatingly up an outer roll-off cylinder formed by the wall of the pressure chamber and off an inner roll-off cylinder formed by the peripheral surface of a support piston for the rolling diaphragm that is axially displaceable in the pressure chamber, the front surface of which support piston is connected with the corresponding surface section of the rolling diaphragm. The inner roll-off cylinder of the support piston shaped as a support plate gradually changes, in the rear limit position of the rolling diaphragm, into the outer roll-off cylinder by way of a support shoulder, which, for the completely mechanical support of the rolling diaphragm, together with the two roll-off surfaces forms a completely gap-free support surface adapted to the natural form and roll-off geometry of the rolling diaphragm.

REFERENCES:
patent: 2820434 (1958-01-01), Otto
patent: 3203186 (1965-08-01), Sheppard
patent: 3769879 (1973-11-01), Lofquist
patent: 4292887 (1981-10-01), Ohta
patent: 4338854 (1982-07-01), Margetts

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