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US 5,219,274 AGranted
Pump with internal pressure relief
AssigneeTuthill Corporation
InventorsHarold D. Pawlowski, Lowell V. Grover
Life of this patent
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AssigneeTuthill Corporation
InventorsHarold D. Pawlowski, Lowell V. Grover
Estimating the term…
A fluid pump having a rotary power source, a rotary to reciprocating motion converter in the form of a cam and cam follower, 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 coupling a pair of opposed diaphragms of a pair of pumping chambers. 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 centrally 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. Each chamber has one-way inlet check valves and one-way outlet check valves. There is a common pump outlet for merging the viscous liquids emanating from the chamber outlet check valves and a common pump inlet for supplying the viscous fluid to the chamber inlet valves.
A double acting pump for moving liquids comprising:
In a fluid pump having a rotary power source, and a rotary to reciprocating motion converter, the improvement for limiting fluid pressure without utilizing a pressure relief bypass comprising, a pair of opposed diaphragms defining at their outwardly facing surfaces a pair of pumping chambers, the diaphragms normally driven in unison by the rotary to reciprocating motion converter to alternately force fluid from one and then the other of the chambers, and a resiliently yieldable coupling between the rotary to reciprocating motion converter and the diaphragms for limiting the fluid pressure within the pumping chambers to predetermined maximum pressures, the diaphragms being fixed relative to their respective pumping chambers about their outer peripheries and centrally coupled to the resiliently yieldable coupling, the diaphragms ceasing to move in unison when the resiliently yieldable coupling yields.
A high viscosity fluid pump having a rotary power source, a rotary to reciprocating motion converter, a pair of opposed diaphragms defining at their outwardly facing surfaces a pair of pumping chambers with the diaphragms normally being driven in unison by the rotary to reciprocating motion converter to alternately force fluid from one and then the other of the chambers, and a spring-loaded lost motion coupling between the rotary to reciprocating motion converter and the diaphragms for limiting the fluid pressure within the pumping chambers to predetermined maximum pressures whereby the spring-loaded lost motion coupling absorbs energy while limiting the pressure in a chamber and releases that stored energy to help power the pump while expelling fluid from the other chamber and the diaphragms may cease to move in unison when the spring-loaded lost motion coupling begins to absorb energy.
A high viscosity fluid pump having a source of reciprocating motion, a pair of opposed diaphragms defining at their outwardly facing surfaces a pair of pumping chambers with the diaphragms normally being driven in unison by the source of reciprocating motion to alternately force fluid from one and then the other of the chambers, and a spring-loaded lost motion coupling between the source of reciprocating motion and the diaphragms for limiting the fluid pressure within the pumping chambers to predetermined maximum pressures, the spring-loaded lost motion coupling absorbing energy while limiting the pressure in a chamber and releases that stored energy to help power the pump while expelling fluid from the other chamber.
Dependencies are inferred from the claim text.