초록 ▼

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. Th

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.

대표청구항 ▼

[ What is claimed:] [12.] A single fluid compression/expansion refrigeration apparatus which comprises:a fill of fluid refrigerant that exists in the apparatus as liquid and a vapor;a compressor for compressing the fluid refrigerant thereby adding compression energy to the refrigerant fluid, said co

[ What is claimed:] [12.] A single fluid compression/expansion refrigeration apparatus which comprises:a fill of fluid refrigerant that exists in the apparatus as liquid and a vapor;a compressor for compressing the fluid refrigerant thereby adding compression energy to the refrigerant fluid, said compressor having an inlet to receive said fluid at a predetermined reduced pressure and an outlet from which the fluid is delivered at an elevated pressure;a drive motor coupled to said main compressor for driving said main compressor;condenser means for extracting heat from the refrigerant thus converting the compressed vapor emerging from said main compressor into a liquid;evaporator means for absorbing external heat into the refrigerant and for converting liquid refrigerant into vapor; anda plural rotary displacement machine disposed between said condenser means and an input to said evaporator means, said plural displacement machine comprising:a first rotor having a plurality of helical lobes disposed about a rotor periphery;at least one second rotor in meshing contact with said first rotor and having a plurality of helical grooves disposed about a rotor periphery for receiving the lobes of said first rotor during rotation of said rotors in opposite directions; anda housing defining a chamber enclosing the rotors and having an inlet port at one end and an outlet port at an opposite end;said housing including an intermediate port formed in a side wall of said chamber between the inlet port and the outlet port and wherein said rotors and said housing define during rotation of said first rotor in one direction an effectively closed expanding working chamber between the inlet and intermediate ports and an effectively closed contracting working chamber between said intermediate ports and said outlet port.