Refrigerant cycle device

摘要

A refrigerant cycle device includes a first refrigerant passage for guiding refrigerant from a refrigerant radiator to an inlet side of an outdoor heat exchanger, a first throttle part capable of varying an opening area of the first refrigerant passage, a second refrigerant passage for guiding the refrigerant from the outdoor heat exchanger to a compressor-suction side, a first opening/closing part for opening/closing the second refrigerant passage, a third refrigerant passage for guiding the refrigerant from the outdoor heat exchanger to the compressor-suction side via an evaporator, a second throttle part capable of varying an opening area of the third refrigerant passage, a bypass passage for guiding the refrigerant flowing between the refrigerant radiator and the first throttle part to a position between the outdoor heat exchanger and the second throttle part in the third refrigerant passage, and a second opening/closing part for opening/closing the bypass passage.

主权项

1. A refrigerant cycle device comprising:
a compressor configured to suck, compress, and discharge refrigerant; a refrigerant radiator disposed to radiate heat of the refrigerant discharged from the compressor to thereby heat an external fluid; a first pressure reducing part disposed to reduce pressure of the refrigerant flowing out of the refrigerant radiator to thereby expand the refrigerant; an evaporator disposed to evaporate the refrigerant reduced in pressure by the first pressure reducing part to thereby absorb heat from the external fluid; and a second pressure reducing part that reduces pressure of the refrigerant evaporated by the evaporator and to be sucked by the compressor and that is configured to vary an amount of pressure reduction, wherein one of an amount of the refrigerant discharged from the compressor and an amount of pressure reduction of the refrigerant of the second pressure reducing part is adjusted in such a way that a heating capacity of the refrigerant radiator or a value of a physical amount related to the heating capacity becomes equal to a heating target value, and the other of the amount of the refrigerant discharged from the compressor and the amount of pressure reduction of the refrigerant of the second pressure reducing part is adjusted in such a way that a heat absorbing capacity of the evaporator or a value of a physical amount related to the heat absorbing capacity becomes equal to a heat-absorption target value; the refrigerant cycle device further comprising: a control part for controlling the amount of discharge of the refrigerant of the compressor on the basis of the heating capacity or the value of the physical amount related to the heating capacity, wherein the second pressure reducing part is a constant-pressure valve that prevents a refrigerant pressure in the evaporator from becoming less than a specified pressure even if pressure of the refrigerant sucked by the compressor becomes lower, the control part controls the amount of discharge of the refrigerant in such a way that the heating capacity or the value of the physical amount related to the heating capacity becomes equal to the heating target value, and the second pressure reducing part adjusts the amount of pressure reduction of the refrigerant in such a way that the heat absorbing capacity or the physical amount related to the heat absorbing capacity becomes equal to the heat-absorption target value.