Patent ID: 8671707
Filing Date: 2014-03-18
Classification: B60H,F25B

Abstract:
1. A heat pump cycle comprising: a compressor configured to compress refrigerant, the compressor having a suction port through which refrigerant is drawn to be compressed, and a discharge port from which the compressed refrigerant is discharged; a heating heat exchanger configured to heat air, which is blown toward an air-conditioning target space, by heat exchange with the refrigerant discharged from the discharge port of the compressor; a first expansion device configured to decompress the refrigerant flowing out of the heating heat exchanger; a gas-liquid separation portion configured to separate the refrigerant flowing out of the first expansion device into gas refrigerant and liquid refrigerant; a second expansion device configured to decompress the liquid refrigerant separated in the gas-liquid separation portion; an exterior heat exchanger in which the refrigerant flowing out of the second expansion device exchanges heat with outside air; a third expansion device configured to decompress the refrigerant flowing out of the exterior heat exchanger; a cooling heat exchanger arranged upstream of the heating heat exchanger in a flow direction of the blown air, the cooling heat exchanger being configured to cool the blown air by heat exchange between the blown air and the refrigerant flowing out of the third expansion device and to let the refrigerant flow to the suction port; an intermediate pressure passage configured to guide the gas refrigerant from the gas-liquid separation portion to the suction port; an open-close portion configured to open or close the intermediate pressure passage; and a fourth expansion device configured to decompress the gas refrigerant flowing in the intermediate pressure passage, wherein the open-close portion and the fourth expansion device are provided to select a bypass dehumidifying-heating mode as a dehumidifying-heating mode in which the blown air having been cooled in the cooling heat exchanger is heated in the heating heat exchanger to be equal to or higher than air in the air-conditioning target space in temperature, and the open-close valve opens the intermediate pressure passage such that the gas refrigerant flowing out of the gas-liquid separation portion is decompressed by the fourth expansion device and is introduced into the suction port of the compressor, in the bypass dehumidifying-heating mode.