JPS6458961A - Air conditioner - Google Patents

Abstract

PURPOSE: To keep the level of the oil reserved within a rotary compressor, by inhibiting the rise of the number of revolution of a motor until the temperature of a sealed case goes up to the specified temperature against the temperature of the condenser, and keeping the quantity of a circulating refrigerant. CONSTITUTION: A controller 22 gets the difference ΔT(=T1 -T2 ) between the temperature T1 inputted from, for example, a temperature sensor 20 on case side and the temperature T2 of heat exchanger from a temperature sensor 21a on heat exchanger side, and it does not raise the number of revolution of a motor 8, even if air conditioning load is large, until the case temperature T1 comes to a certain temperature or over from the temperature T2 of heat exchange, for example, until the temperature difference ΔT becomes 10 deg.C or over. In the course of time, the operation with a little quantity of circulating refrigerant is performed. Moreover, an outdoor heat exchanger 5 to serve as a condenser at cooling is provided with a heat exchange temperature sensor 21b connected to the control circuit 22, too, and also at cooling operation, the number of revolution of the motor 8 is not raised until the case temperature T1 goes up to the specified temperature to the heat exchange temperature T2 similar to the warming operation.