HEAT COMPRESSOR OF MULTI-STAGE TYPE

摘要

PURPOSE: A heat compressor of multi-stage type is provided to have semi-permanent lifespan and to improve compressing efficiency by directly heating and compressing refrigerant by using electric energy not to require lubrication. CONSTITUTION: A refrigerant is flowed into a suction aperture(12) of a heat pump(10) through an evaporator and electricity(22) is fed to a heater(21) to heat the refrigerant. The refrigerant in a compressor(11) is expanded for increasing the pressure of the compressor. A nonreturn valve(32) in the second compressor is opened for closing the nonreturn valve of the first compressor to short a switch(23) connected to electricity. Thus, the refrigerant discharged through a vent port(13) of the compressor flows to the compressor of a second heat pump. Then, the switch of the electricity is grounded to the heater installed in the compressor and supply heat source to the compressor. The compressed refrigerant in the second compressor flows to the third compressor for compressing the refrigerant at a desired pressure at the last outlet.