Pumps – Successive stages – Stages driven by relatively movable motor working members
Patent
1976-09-15
1978-06-06
Croyle, Carlton R.
Pumps
Successive stages
Stages driven by relatively movable motor working members
417395, 123139AH, 123139AN, F04B 300, F04B 4306
Patent
active
040934039
ABSTRACT:
Disclosed herein is a fluid-actuated, diaphragm pump which is particularly adaptable for use as a fuel pump for a multi-cylinder, two-cycle internal combustion engine and which includes an inlet chamber, an outlet chamber, a first diaphragm separating the inlet chamber into a first pulse chamber and a suction chamber, and a second diaphragm separating the outlet chamber into a second pulse chamber and a pressure chamber. The two pulse chambers are connected to separate sources of regularly cycling or pulsating pressures which are at least 90.degree. out of phase from each other and the two diaphragms are oscillated sequentially, in response to the pressure variations in the respective pulse chambers, between a suction position and a pumping position whereby fluid is first drawn into the suction chamber through an inlet, subsequently pumped therefrom into the pressure chamber, and then pumped from the pressure chamber through an outlet. Each of the diaphragms is biased towards a suction position by a spring disposed in the respective suction and pressure chambers. The biasing force of the spring in the suction chamber is substantially greater than that of the spring in the pressure chamber so as to boost the suction capability of the pump without hindering the outlet pressure capacity.
REFERENCES:
patent: 2585172 (1952-02-01), Reynolds
patent: 2713854 (1955-07-01), Conover
patent: 2713858 (1955-07-01), Armstrong et al.
patent: 2835239 (1958-05-01), Dickrell
patent: 2997961 (1961-08-01), McDuffie
patent: 3263701 (1966-08-01), Johnson
patent: 3586461 (1971-06-01), Erlandson
Schrimpf Carl F.
Van Rens Russel J.
Croyle Carlton R.
Outboard Marine Corporation
Ross Thomas I.
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