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AssigneeOutboard Marine Corporation
InventorsCarl F. Schrimpf, Russel J. Van Rens
Estimating the term…
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.
A fluid actuated fuel pump comprising means defining separate inlet and outlet chambers each including respective first and second wall portions, a first flexible diaphragm disposed in said inlet chamber and separating said inlet chamber into a first pulse chamber and a suction chamber including said first wall portion, said first diaphragm being movable away from and toward first wall portion, a fuel intake through which fuel is admitted into said suction chamber, a second flexible diaphragm in said outlet chamber and separating said outlet chamber into a second pulse chamber and a pressure chamber including said second wall portion, said second diaphragm being movable away from and toward said second wall portion, fuel transfer means communicating between said suction and pressure chambers and through which fuel is pumped from said suction chamber to said pressure chamber when said first diaphragm is moved toward said first wall portion, a fuel outlet through which fuel is pumped from said pressure chamber when said second diaphragm is moved toward said second wall portion, a first pressure inlet communicating with said first pulse chamber and adapted for connection to a first source of regularly cycling pressure pulses, a second pressure inlet communicating with said second pulse chamber and adapted for connection to a second source of regularly cycling pressure pulses, the second source of pressure pulses being of substantially equal intensity as the first source of pressure pulses and at least 90.degree. out of phase from the first source of pressure pulses, whereby said first diaphragm in response to the cyclical pressure variations in said first pulse chamber alternately moves away from said first wall portion to draw fuel into said suction chamber through said fuel intake and toward said first wall portion to pump fuel from said suction chamber into said pressure chamber through said fuel transfer means and whereby said second diaphragm sequentially with respect to said first diaphragm and in response to cyclical pressure variations in said second pulse chamber alternatively moves away from said second wall portion to admit fuel being pumped through said fuel transfer means by said first diaphragm into said pressure chamber and toward said second wall portion to pump fuel from said pressure chamber through said fuel outlet, first biasing means for biasing said first diaphragm in a direction away from said first wall portion, and second biasing means for biasing said second diaphragm in a direction away from said second wall portion, the biasing force of said second biasing means being less than the biasing force of said first biasing means.
A fluid actuated pump for pumping a fluid comprising means defining separate inlet and outlet chambers each including respective first and second wall portions, a first flexible diaphragm disposed in said inlet chamber and separating said inlet chamber into a first pulse chamber and a suction chamber including said first wall portion, said first diaphragm being movable away from and toward first wall portion, an intake through which the fluid to be pumped is admitted into said suction chamber, a second flexible diaphragm disposed in said outlet chamber and separating said outlet chamber into a second pulse chamber and a pressure chamber including said second wall portion, said second diaphragm being movable away from and toward said second wall portion, fluid transfer means communicating between said suction and pressure chamber and through which the fluid is pumped from said suction chamber to said pressure chamber when said first diaphragm is moved toward said first wall portion, an outlet through which the fluid is pumped from said pressure chamber when said second diaphragm is moved toward said second wall portion, a first pressure inlet communicating with said first pulse chamber and adapted for connection to a first source of regularly cycling pressure pulses, a second pressure inlet communicating with said second pulse chamber and adapted for connection to a second source or regularly cycling pressure pulses, the second source of pressure pulses being of substantially equal intensity as the first source of pressure pulses and at least 90.degree. out of phase from the first source of pressure pulses whereby said first diaphragm, in response to the cyclical pressure variations in said first pulse chamber, alternatively moves away from said first wall portion to draw the fluid into said suction chamber through said intake and toward said first wall portion to pump the fluid from said suction chamber into said pressure chamber through said fluid transfer means and whereby said second diaphragm, sequentially with respect to said first diaphragm and in response to cyclical pressure variations in said second pulse chamber, alternately moves away from said second wall portion to admit the fluid being pumped through said fluid transfer means by said first diaphragm into said pressure chamber and toward said second wall portion to pump the fluid from said pressure chamber through said outlet, a first spring biasing said first diaphragm in a direction away from said first wall portion, the biasing force of said first spring approaching but being less than the pressure force provided by the pressure in said first pulse chamber and acting on said first diaphragm to move said first diaphragm in a direction toward said first wall portion, and a second spring biasing said second diaphragm in a direction away from said second wall portion, the biasing force of said second spring being less than the biasing force of said first spring and acting on said second diaphragm to move said second diaphragm away from said second wall portion.
Dependencies are inferred from the claim text.