Motor-driven fluid pump

Details Motor-driven fluid pump Motor-driven fluid pump

1987-04-14

1988-01-26

Smith, Leonard E.

Pumps

Correlated pump and motor or clutch control

128685, F04B 3908, A61B 502

Patent

active

047214384

ABSTRACT:
A fluid pump has a pumping member which defines the boundary of a pump chamber and is driven to reciprocate between the positions of expanding and contracting the pump chamber for drawing in the pump chamber a fluid and feeding it into a vessel to be pressurized thereby. The pumping member is connected to the output shaft of a reversible motor through a driving linkage capable of translating the rotary motion of the output shaft into the reciprocating motion of the pumping member. A release valve is provided in a fluid path between the pump chamber and the vessel for rapidly releasing the pressurized fluid out of the vessel. The release valve is operatively connected to the motor output shaft through a release valve actuator which responds to the reversal of the motor for opening the release valve and has a delay mechanism providing a delayed response action in opening the release valve so that the initiation of opening the release valve is inhibited until the output shaft rotates in the reverse direction through an angle of more than 180 degrees from the reversing point, thereby inhibiting an unintended opening of the release valve due to the reverse translation of the reciprocating motion of the pumping member because of kickback by pressurized fluid in the pump chamber when the motor is stopped.

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