Patent ID: 8006506

Claim:
A high speed defrosting heat pump in which a refrigerant is circulated in a closed loop formed by a compressor ( 11 ), a four-way valve ( 21 ), an interior heat exchanger ( 12 ), expansion valves ( 23 and 24 ), and an exterior heat exchanger ( 13 ) so as to conduct cooling and heating operations by switching a refrigerant-circulating direction by means of the four-way valve ( 21 ), the high speed defrosting heat pump comprising: a three-way valve ( 22 ) disposed on a refrigerant pipe connected between the compressor ( 11 ) and the four-way valve ( 21 ); and a bypass pipe ( 31 ) is branched off from the three-way valve ( 22 ) in such a manner as to be connected to a refrigerant pipe connected between the expansion valve ( 24 ) and the exterior heat exchanger ( 13 ), whereby hot gas discharged from the compressor ( 11 ) is introduced to the exterior heat exchanger via the bypass tube ( 31 ) under the control of the three-way valve ( 22 ).