Two piston, concentric cylinder, alpha free piston Stirling machine
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United States of America Patent
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Oct 14, 2014
Issued Date -
N/A
app pub date -
May 23, 2012
filing date -
Jan 13, 2012
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Abstract
A two piston, free piston, alpha Stirling cycle machine has a compression piston with a cylindrical bore that is coaxial with the cylinders in which the pistons reciprocate. An expansion piston sealingly extends into both an expansion cylinder and into the cylindrical bore in the compression piston. The expansion piston has the same diameter within both the expansion cylinder and the cylindrical bore. A spring, preferably a gas spring, drivingly connects the pistons. The reciprocation of the expansion piston varies only the volume of the expansion space and the reciprocation of the compression piston varies only the volume of the compression space. The spring that drivingly connects the pistons allows the two pistons to be properly phased without a mechanical linkage so that they can operate in a thermodynamically effective phase over a range of strokes.
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