Patent ID: 9643473
Date: 2017-05-09
CPC Classifications: B60H,F25B

Claim:
1. A heat pump system for a vehicle comprising: a compressor mounted on a refrigerant circulation line for compressing and discharging refrigerant; an interior heat exchanger mounted inside an air-conditioning case for exchanging heat between air inside the air-conditioning case and the refrigerant discharged from the compressor; an evaporator mounted inside the air-conditioning case for exchanging heat between the air inside the air-conditioning case and the refrigerant supplied to the compressor; an exterior heat exchanger mounted outside the air-conditioning case for exchanging heat between the refrigerant circulating through the refrigerant circulation line and outdoor air; first expansion means mounted on the refrigerant circulation line located between the interior heat exchanger and the exterior heat exchanger for expanding refrigerant; second expansion means mounted on the refrigerant circulation line of an inlet side of the evaporator for expanding refrigerant; a bypass line mounted in such a way as to connect the refrigerant circulation line of an inlet side of the second expansion means and the refrigerant circulation line of an outlet side of the evaporator, such that refrigerant bypasses the second expansion means and the evaporator in a heat pump mode; a dehumidification line mounted on the refrigerant circulation line for supplying some of the refrigerant circulating the refrigerant circulation line to the evaporator so as to dehumidify an interior of the vehicle in the heat pump mode; and an auxiliary bypass line mounted on the refrigerant circulation line in order to make the refrigerant passing the first expansion means bypass the exterior heat exchanger when frosting is generated on the exterior heat exchanger, wherein the dehumidification line supplies some of the refrigerant passing the first expansion means to the evaporator, wherein the auxiliary bypass line is separate from the dehumidification line, wherein the second expansion means comprises an expansion valve having an expansion flow channel for expanding refrigerant and a bypass flow channel for making the refrigerant bypass the expansion flow channel, and wherein the dehumidification line connects the refrigerant circulation line of the outlet side of the first expansion means and the bypass flow channel of the expansion valve with each other, such that the refrigerant passing the dehumidification line bypasses the expansion flow channel through the bypass flow channel and is supplied to the evaporator.