US Patent:
20100326130, Dec 30, 2010
Inventors:
Yasutaka Takada - Osaka, JP
Nobuhiro Umeda - Minneapolis MN, US
Kenji Kinokami - Osaka, JP
International Classification:
F25B 1/10
F25D 11/00
Abstract:
An economizer () is provided in a multistage compression refrigeration system including a refrigerant circuit in which a multistage compressor, a condenser, a multistage expansion mechanism, and an evaporator are sequentially connected. The economizer () includes: a tank () having an introducing portion () for introducing a refrigerant of the refrigerant circuit, a liquid outlet () for guiding a liquid refrigerant into the evaporator, and a gas outlet () for guiding a gas refrigerant into a medium pressure portion of the multistage compressor; and a float expansion valve (), which forms part of the multistage expansion mechanism and is attached to the liquid outlet (), and whose throttle amount is adjusted according to a level of the liquid refrigerant in the tank (). Multiple ones of the liquid outlet () and multiple ones of the float expansion valve () are provided.