Variable cycle stirling engine and gas leakage control system th

Details Variable cycle stirling engine and gas leakage control system th Variable cycle stirling engine and gas leakage control system th

1982-07-09

1984-12-25

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...

60520, 60517, F02G 104, F02G 106

Patent

active

044895542

ABSTRACT:
An improved thermal engine of the type having a displacer body movable between the hot end and the cold end of a chamber for subjecting a fluid within that chamber to a thermodynamic cycle and having a work piston driven by the fluid for deriving a useful work output. The work piston pumps a hydraulic fluid and a hydraulic control valve is connected in line with the hydraulic output conduit such that the flow of hydraulic fluid may be restricted to any desired degree or stopped altogether. The work piston can therefore be controlled by means of a controller device independently from the movement of the displacer such that a variety of engine cycles can be obtained for optimum engine efficiency under varying load conditions. While a Stirling engine cycle is particularly contemplated, other engine cycles may be obtained by controlling the movement of the displacer and work pistons. Also disclosed are a working gas recovery system for controlling leakage of working gas from the displacer chamber, and a compound work piston arrangement for preventing leakage of hydraulic fluid around the work piston into the displacer chamber.

REFERENCES:
patent: Re30176 (1979-12-01), Beale
patent: 3487635 (1970-01-01), Prast et al.
patent: 3828558 (1974-08-01), Beale
patent: 3848877 (1974-11-01), Bengtsson et al.
patent: 3986360 (1976-10-01), Hagen et al.
patent: 4215548 (1980-08-01), Beremand
patent: 4353683 (1982-10-01), Clark

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