Piston position drift control for free-piston device

Details Piston position drift control for free-piston device Piston position drift control for free-piston device

2005-06-07

2005-06-07

Lazo, Thomas E. (Department: 3745)

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...

C123S0460SC

Reexamination Certificate

active

06901755

ABSTRACT:
A piston position drift control for a free-piston device. The control includes a passage connecting internal volumes of the device, the passage being substantially shorter than an acoustic wavelength of the device; and a check valve in the passage for controlling fluid communication between the internal volumes, the check valve having an opening pressure not less than approximately 20% of a maximum pressure differential of the device at a maximum stroke. The control is passive, requires no active control once in service, provides low susceptibility to damage or fouling, and is amenable to adjustment or repair if needed. In addition, the control is small and inexpensive, and functions across the entire operational range of a free-piston device it supports. A related free-piston device including the piston position drift control is also provided.

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patent: 09242903 (1997-09-01), None

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