To restrain reduction in efficiency for recovering motive power by preventing excessive reduction in pressure of an expansion chamber 62 under a prescribed operation condition in a displacement expander.
A connecting passage 72 is arranged for communicating an expansion process intermediate position with an outflow position in the expansion chamber 62, and outflow side fluid is returned to the expansion chamber 62.
|JP62009861||CONTROL DEVICE FOR ROTARY SPEED OF PNEUMATICALLY DRIVEN ROTARY MACHINE|
|JP2003214105||AIR ROTATING TOOL|
|WO/2004/055331||VOLUME EXPANDER AND FLUID MACHINE|