| 摘要 |
A positive displacement machine having a set of parallel meshing rotors employed in a compression-expansion refrigeration system receives a fluid refrigerant input from a condenser and expands the fluid in a first zone and forces substantially all of the liquid in the first zone to an evaporator. The remaining fluid from the first zone of the machine is then compressed in an adjacent second zone of the machine to form a high pressure vapor, which is then routed back to the condenser. The positive displacement machine includes a first rotor having a plurality of helical lobes disposed about a rotor periphery. At least one second rotor has a plurality of helical grooves disposed about a second rotor periphery for receiving the lobes of the first rotor during rotation of the rotors in opposite directions. A housing defines a chamber for enclosing the rotors. The plural displacement machine includes an inlet port at one end, an outlet port at an opposing end, and an intermediate port in a side wall of the chamber between the inlet and outlet ports. An effectively closed expanding working chamber is formed between the inlet and intermediate ports, while an effectively closed contracting working chamber is formed between the intermediate and outlet ports.
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