OIL EQUALIZING CIRCUIT FOR COMPRESSION MECHANISM, HEAT SOURCE UNIT FOR AIR-CONDITIONING APPARATUS, AND AIR-CONDITIONING APPARATUS EQUIPPED THEREWITH

摘要

PROBLEM TO BE SOLVED: To provide an oil equalizing circuit for improving the reliability of oil supply to compression mechanisms.;SOLUTION: The oil equalizing circuit 152 for the compression mechanisms equalizes oil among the compression mechanisms 111, 211, 311 of a plurality of heat source units 102, 202, 302 in an air-conditioning apparatus 101 constructed by connecting the plurality of heat source units 102, 202, 302 to a plurality of service units 5 via cooling medium pipes. The oil equalizing circuit 152 comprises oil return pipes 125, 225, 325 and communication pipes 118. The oil return pipes 125, 225, 325 are formed to connect oil sump portions of the compression mechanisms to the suction sides of the compression mechanisms so that the oil discharged from the oil sump portions of the compression mechanisms can be supplied to or cut off the suction sides of the compression mechanisms. The communication pipes 118 communicate the oil return pipes with one another.;COPYRIGHT: (C)2004,JPO