Patent ID: 6343482
Filing Date: 2002-02-05
Classification: F25B,Y02B

Abstract:
A heat pump type air conditioner comprising:an exterior unit including an exterior heat exchanger, a plurality of compressors, a four-way valve, an exterior expansion device, and an injection circuit for injecting the liquid refrigerant into each of said plurality of compressors, wherein said plurality of compressors includes a capacity variable type compressor of which rotational speed is controlled; a plurality of interior units, each of which includes an interior heat exchanger, connected to said exterior unit, wherein said exterior unit further comprises means for controlling flow rate of the liquid refrigerant to be injected in accordance with number of said plurality of interior units; a liquid injection expansion valve provided in an injection circuit portion of said injection circuit for said capacity variable compressor, liquid injection electromagnetic valves respectively provided in injection circuit portions of said injection circuit or compressors other than said capacity variable compressor, and a flow rate controller for controlling degree of opening of said liquid injection expansion valve and opening/closing of said electromagnetic valves.