Pump with internal pressure relief

Details Pump with internal pressure relief Pump with internal pressure relief

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 17/00 (2006.01) F04B 9/06 (2006.01) F04B 49/00 (2006.01)

Patent

CA 2140664

A fluid pump having a rotary power source, a rotary to reciprocating motion converter in the form of a cam (13) and cam follower (15), a rotary speed reducing gear train coupling the rotary power source to the rotary to reciprocating motion converter, and no pressure relief bypass is disclosed. The pressure relief function of limiting the fluid pressure within the pumping chambers to predetermined maximum pressures is provided by a pair of springs (29, 31) coupling a pair of opposed diaphragms (17, 19) of a pair of pumping chambers (25, 27). The springs function as a spring-loaded lost motion coupling which absorbs energy while limiting the pressure in a pumping chamber and releases that stored energy to help power the pump while expelling fluid from the other chamber. The diaphragms are fixed relative to their respective pumping chambers about their outer peripheries and cen- trally coupled to their respective springs. The diaphragms are normally driven to move in unison but cease to move in unison when one of the springs yields. The pump is especially adapted to pumping relatively viscous fluids.

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