Patent ID: 6446456
Filing Date: 2002-09-10
Classification: F25B,Y10T

Abstract:
A heat pump comprising:a compressor having an inlet for drawing, and compressing low temperature and low pressure refrigerant, and an outlet for discharging the compressed refrigerant; a four way valve for connecting the outlet and the inlet to an indoor heat exchanger and an outdoor heat exchanger selectively depending on cooling/heating; the indoor heat exchanger for evaporating/condensing the refrigerant by heat exchange with room air in cooling/heating, respectively; the outdoor heat exchanger for evaporating/condensing the refrigerant by heat exchange with external air; a capillary tube having a reduced diameter for expansion of the refrigerant connecting the indoor hear exchanger to the outdoor heat exchanger; a change over valve having a plunger movable by a pressure difference provided therein, the change over valve being in communication with the compressor; and, a connection tube connecting the indoor heat exchanger and the four way valve, and a bypass tube connected between the connection tube and the change over valve.