PURPOSE: To decrease the number of parts, increase reliability, and prevent noise by setting a heat exchanger, a coolant induction pipe connecting one end of the heat exchanger to a coolant receiving part, and an injector set at a connector connecting the other end of the heat exchanger to a discharge pipe of a compressor.

CONSTITUTION: At the lower inside part of a hermetic case 6 are put lubricant 12 and a heat exchanger soaked in it. A condenser 3 is composed of a hermetic case 14 where collant stays, a water-cooled heat exchanger 15, and a pipe 16 connecting with a decompressing expansioner 4. A hermetic compressor 2 and the condenser 3 are connected with each other through a compressor discharge pipe 17 connected with a compressor 8, an injector 18, and an outer air discharge pipe 19. Furthermore, an induction pipe 20 to the heat exchanger 13 is connected to the lower part of the hermetic case 14 of the condenser 3, and the outlet side is connected near the outflow side of a restrictor 21 of the injector 18. Thus, with the outer discharge pipe 19 undevided and an outer induction pipe abolished, fewer parts are required.