Method and apparatus for controlling the movement of a free, gas-driven displacer in a cooling engine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 17, 1991
Grant Date -
N/A
app pub date -
Mar 14, 1990
filing date -
Mar 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for controlling the reciprocal movement of a free piston, gas-driven displacer in a cooling engine are disclosed. A bi-directional magnetic 'detent' is established for the displacer at both the top dead center and bottom dead center portions of the cooling cycle. Each bi-directional magnetic 'detent' provides a magnetic snubbing force to limit overshooting of the displacer in one direction and a magnetic retention force to hold the displacer from moving in the other direction until a pre-determined pressure differential is established across the displacer's drive piston. The magnetic 'detents' are formed by means of a three pole double magnet with a single core or alternatively, by a two pole single magnet with a double core. The magnetic snubbing and retention forces can be made equal or unequal in magnitude either through the selection of permanent magnet(s) or core configuration(s) or by controlling the field strength of electro-magnets.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully