POSITIVE DISPLACEMENT EXPANDER AND REFRIGERATION CYCLE DEVICE USING THE POSITIVE DISPLACEMENT EXPANDER

摘要

Disclosed is a positive displacement expander equipped with an expansion mechanism in which power is generated using fluid energy produced while a high-pressure fluid, supplied to a plurality of expansion chambers 81 a and 82a partitioned by an orbiting scroll or a rolling piston, is being expanded and decompressed. The expander includes a communicating pipe 71 that allows each of the expansion chambers 81 a and 82a to communicate with an expander discharge side and an opening and closing device 72 disposed on the communicating pipe 71. When supply of the high-pressure fluid is stopped, the opening and closing device 72 is opened by the time when high and low pressures between each of the expansion chambers 81 a and 82a and the expander discharge side are equalized, thus stopping the orbiting scroll or the rolling piston at a predetermined position so that an expander 8 obtains sufficient driving force when resuming.