| 摘要 |
In a heat pump system, a dual diameter, double-acting free piston apparatus is utilized as an expander-compressor. Working fluid is compressed in the large diameter portion of the free piston apparatus and is directed to a condenser. Part of the working fluid flowing from the condenser is directed through an expansion valve and an evaporator, and is then alternately admitted to the opposite ends of the large diameter portion of the free piston apparatus. The remainder of the working fluid flowing from the condenser is directed through a pump and a boiler and is then alternately admitted to the small diameter portions of the free piston apparatus, whereupon the working fluid is expanded to effect actuation of the apparatus. The flow of high temperature, high pressure working fluid into the small diameter portions of the free piston apparatus is controlled by disk valves which also function to direct spent working fluid from the small diameter portions of the free piston apparatus to the condenser. The free piston apparatus further comprises a housing which forms a hermetic seal enclosing all of the reciprocating and rotating components of the system.
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