Piston centering method and apparatus for free-piston Stirling e

Details Piston centering method and apparatus for free-piston Stirling e Piston centering method and apparatus for free-piston Stirling e

1985-08-19

1986-04-22

Ostrager, Allen M.

Power plants

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

Unit of mass is a gas which is heated or cooled in one of a...

F02G 104

Patent

active

045833648

ABSTRACT:
In a free piston Stirling engine, an improved method and apparatus for preventing the creep of the mean position of the piston as a result of leakage of the working gas between the working space and the bounce space. A passageway is formed between the bounce space and the working space and extends through ports which interface with the piston and the displacer. Unlike the prior art, the port in the piston which registers with another port is offset from the mean position of the piston. Instead, the ports register when the bounce space and working space pressures are supposed to be equal. Additionally, the displacer blocks another port to prevent communication between the bounce space and the work space when the piston is moving outwardly from the work space, but opens to permit communication, and an equalizing flow of gas to counterbalance leakage, when the piston is moving into the working space.

REFERENCES:
patent: 4183214 (1980-01-01), Beale et al.
patent: 4404802 (1983-09-01), Beale et al.

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