Thermal fluid displacement actuator

Details Thermal fluid displacement actuator Thermal fluid displacement actuator

1976-12-23

1978-01-31

Ostrager, Allen M.

Power plants

Motor operated by expansion and/or contraction of a unit of...

Mass is a liquid

F03G 706

Patent

active

040708594

ABSTRACT:
An electro-thermal fluid displacement actuator includes a fixed volume boiler chamber and a variable volume actuation chamber formed by a ported partition being received in the main body of the actuator between a positive temperature coefficient heat source for the contained fluid and an elastomeric diaphragm. Upon energization of the heat source, a portion of the contained fluid vaporizes to increase the pressure in the boiler chamber resulting in displacement of some of the remainingfluid through the partition ports and into contact with the diaphragm to drive the same and the piston assembly mounted thereon through the predetermined stroke thereof. The displaced fluid contacting the diaphragm has a lower temperature than the fluid adjacent the heater because of its passage through the ported partition to a position remote from such heater, such reduction in fluid temperature resulting in a lower permeation rate for the fluid through the elastomer and consequently increasing the life of the actuator.

REFERENCES:
patent: 3991572 (1976-11-01), Huebscher

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