Heat pump type airconditioner

A heat pump type airconditioner operable in a cooling operation mode, and a warming operation mode employing a refrigerant heated with a heat generation means as a heat source, comprising:

• a compressor which compresses the refrigerant, a first heat exchanger with is disposed indoors and which functions as a vaporizer in the cooling operation mode and as a condenser in the warming operation mode, a second heat exchanger which is disposed outdoors and which functions as a condenser in the cooling operation mode, a third heat exchanger which is disposed in parallel with said second heat exchanger and which heats the refrigerant in the warming operation mode, a burner constituting the heat generation means which supplies heat to said third heat exchanger, the combustion gas from which is directly applied to said third heat exchanger, a reservoir which stores the excess refrigerant in a pipe line where the refrigerant is in the liquid phase in the cooling operation mode, a pressure reduction mechanism which is disposed between said reservoir and said first heat exchanger and which reduces the pressure of the refrigerant circulating in the cooling operation mode, around said pressure reduction mechanism to bypass the refrigerant tending to flow to said pressure reduction mechanism in the warming operation mode, first valve means disposed at one end of said second heat exchanger on the reservoir side and functioning so as to cause the liquid refrigerant to be stored in said second heat exchanger in the warming operation mode, second valve means disposed at one end of said third heat exchanger on the compressor side and functioning so as to prevent the refrigerant from flowing through said third heat exchanger in the cooling operation mode, first temperature detection means adjacent the refrigerant outlet of said third heat exchanger to sense the temperature of the refrigerant heated in said third heat exchanger in the warming operation mode, blowing means disposed in correspondence with said first heat exchanger and blowing cold air and warm air from said first heat exchanger into a room in the cooling and warming operation modes respectively, second temperature detection means adjacent said first heat exchanger to sense the temperature of the air blown over said first heat exchanger in the warming operation mode, and control means connected to the respective temperature detection means to stop operation of said burner in the warming operation mode when the refrigerant temperature detected by said first temperature detection means has exceeded a predetermined value and also to regulate the rate of flow of the air from said blowing means in dependence on the air temperature detected by said second temperature detection means.

A heat pump type airconditioner operable in a cooling operation mode, and a warming operation mode employing a refrigerant heated with a heat generation means as a heat source, comprising:

• a compressor which compresses the refrigerant, a changeover valve which is connected to the delivery pipe and the suction pipe of said compressor and which reverses the flow of the refrigerant in the cooling and warming operation modes, a first heat exchanger which is disposed indoors and which functions as a vaporizer in the cooling operation mode and as a condenser in the warming operation mode, a second heat exchanger which is disposed outdoors and which functions as a condenser in the cooling operation mode, a third heat exchanger which is disposed in parallel with said second heat exchanger and which heats the refrigerant in the warming operation mode, a burner constituting the heat generation means which supplies heat to said third heat exchanger the combustion gas from which is directly applied to said third heat exchanger, a reservoir which stores the excess refrigerant in a pipe line where the refrigerant is in the liquid phase in the cooling operation mode, a pressure reduction mechanism which is disposed between said reservoir and said first heat exchanger and which reduces the pressure of the refrigerant circulating in the cooling operation mode, a check valve which is disposed in parallel with said pressure reduction mechanism and which bypasses the refrigerant flowing toward said pressure reduction mechanism in the warming operation mode, first valve means disposed at one end of said second heat exchanger on the reservoir side and functioning so as to cause the liquid refrigerant to be stored in said second heat exchanger in the warming operation mode, second valve means disposed at one end of said third heat exchanger on the compressor side and functioning so as to cause the liquid refrigerant to be stored in said third heat exchanger in the cooling operation mode, first temperature detection means adjacent the refrigerant outlet of said third heat exchanger to sense the temperature of the refrigerant heated in said third heat exchanger in the warming operation mode, blowing means disposed in correspondence with said first heat exchanger and blowing cold air and warm air from said first heat exchanger into a room in the cooling and warming operation modes respectively, second temperature detection means adjacent the first heat exchanger to sense the temperature of the air blown over said first heat exchanger in the warming operation mode, and control means connected to the respective temperature detection means to stop operation of said burner in the warming operation mode when the refrigerant temperature detected by said first temperature detection means has exceeded a predetermined value and also to regulate the rate of flow of the air from said blowing means in dependence on the air temperature detected by said second temperature detection means.

A heat pump type airconditioner operable in a cooling operation mode, and a warming operation mode employing a refrigerant heated with a heat generation means as a heat source, comprising:

• a compressor which compresses the refrigerant, a changeover valve which is connected to the delivery pipe and the suction pipe of said compressor and which reverses the flow of the refrigerant in the cooling and warming operation modes, and indoor heat exchanger which is disposed indoors and which functions as a vaporizer in the cooling operation mode and as a condenser in the warming operation mode, an outdoor heat exchanger which is disposed outdoors and which functions as a condenser in the cooling operation mode, an endothermic heat exchanger which is disposed in parallel with said outdoor heat exchanger and which heats the refrigerant in the warming operation mode, a burner constituting the heat generation means which supplies heat to said endothermic heat exchanger the combustion gas from which is directly applied to said endothermic heat exchanger, a reservoir which stores the excess refrigerant in a pipe line where the refrigerant is in the liquid phase in the cooling operation mode, a pressure reduction mechanism which is disposed between said reservoir and said indoor heat exchanger and which reduces the pressure of the refrigerant circulating in the cooling operation mode, a first check valve which is disposed in parallel with said pressure reduction mechanism and which bypasses the refrigerant flowing toward said pressure reduction mechanism in the warming operation mode, a second check valve which is disposed at one end of said outdoor heat exchanger on the reservoir side and which functions so as to cause the liquid refrigerant to be stored in said outdoor heat exchanger in the warming operation mode, a third check valve which is disposed at one end of said endothermic heat exchanger on the compressor side and which functions so as to cause the liquid refrigerant to be stored in the endothermic heat exchanger in the cooling operation mode a first temperature sensor which senses the temperature of the refrigerant heated by said endothermic heat exchanger in the warming operation mode and which is mounted on the outer periphery of a refrigerant pipe located between said third check valve and said endothermic heat exchanger, a blower which is disposed in correspondence with said indoor heat exchanger and which blows cold air and warm air from said indoor heat exchanger into a room in the cooling and warming operation modes respectively, a second temperature sensor adjacent said indoor heat exchanger which senses the temperature of the air stream blown over said indoor heat exchanger in the warming operation mode, and control means connected to said first and second temperature sensors to stop operation of said burner in the warming operation when the refrigerant temperature sensed by said first temperature sensor has exceeded a predetermined value not higher than the deterioration temperature of said refrigerant as well as a refrigerating machine oil, and also to regulate the rate of flow of the air from said blower in dependence on the air temperature sensed by said second temperature sensor.