F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/37
F04B 43/06 (2006.01) F02M 37/12 (2006.01) F04B 43/02 (2006.01) F02B 75/02 (2006.01)
Patent
CA 1088809
ABSTRACT OF THE DISCLOSURE 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° 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 there- from 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 hinder- ing the outlet pressure capacity.
280528
Schrimpf Carl F.
Van Rens Russell J.
Outboard Marine Corporation
Smart & Biggar
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