PURPOSE: To prevent bubbles of refrigerant from flowing to an outlet by disposing an inlet for introducing refrigerant from a refrigerant condenser to a liquid receiver and the outlet for discharging the refrigerant to a refrigerant evaporator through expansion means in a storage liquid phase refrigerant in a lower part of the receiver, and providing bubbles shut-off means.

CONSTITUTION: An outlet (o) is disposed in a lower part of a liquid receiver T. The outlet (o) is so disposed in storage liquid phase refrigerant Rww of the receiver T as to introduce condensed refrigerant Rw from a refrigerant condenser from an inlet (i) to the receiver T and to allow bubbles-shut-off means X to feed the liquid phase refrigerant to the outlet (o). Thus, the refrigerant Rww from the inlet (i) is sent from the outlet (o) to expansion means of a refrigerant evaporator, and even if bubbles of the refrigerant Rww are mixed with the refrigerant introduced from the inlet (i), flowout of the bubbles to the outlet (o) together with the refrigerant Rww is prevented, only the refrigerant Rww is sent to the expansion means, thereby improving stability of an operation of a heat pump.