| 摘要 |
A centering apparatus for a free piston Stirling engine including a pressure regulator valve (50) which connects a passageway between the work space and the back space when both (a) the average pressure in the back space exceeds the average pressure in the work space as a result of the piston (14) deflecting a spring (32, 34) and simultaneously (b) the instantaneous pressure in the back space exceeds the instantaneous pressure in the work space. A diaphragm (56) spans across an actuator housing cavity, dividing the cavity into an upper chamber and a lower chamber. A connector valve (52) is linked to the diaphragm for opening and closing the valve upon displacement of the diaphragm. When the average back space pressure exceeds the average work space pressure, the diaphragm (56) is displaced to open the valve, connecting the work space and the back space in fluid communication. A check valve (88) permits the flow of gas in only one direction: from the back space (20) to the work space (18). A similar arrangement can be included to also cause flow from the work space to the back space (20) when the average work space pressure exceeds the average back space pressure, so as to center the piston (14) against leaks in either direction.
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