ECONOMIZER

摘要

Disclosed is an economizer (24) that is provided in a multistage compression refrigeration system with a refrigerant circuit in which a multistage compressor, a condenser, a multistage expansion mechanism and an evaporator are successively connected. The economizer (24) comprises a tank (24a) in which an introduction part (24d) for introducing refrigerant in the refrigerant circuit, a liquid outlet (24b) for delivering liquid refrigerant to the evaporator, and a gas outlet (24c) for introducing gas refrigerant to the intermediate pressure section of the multistage compressor are formed, and a float expansion valve (25) which constitutes a part of the multistage expansion mechanism and is installed to the liquid outlet (24b) and of which the throttling quantity is regulated depending on the surface level of liquid refrigerant in the tank (24a). A plurality of liquid outlets (24b) and a plurality of float expansion valves (25) are provided.