Heat pump system for vehicle

摘要

A heat pump system including a water-cooled type heat exchanger, which is a heat supply means, mounted on a first bypass line bypassing a second indoor heat exchanger to collect waste heat of vehicle electric devices to thereby enhance a heating efficiency of the heat pump system. The heat pump system for a vehicle includes: a branch line for connecting a refrigerant circulation line of the second indoor heat exchanger and the first bypass line with each other; a second bypass line, which bypasses an outdoor heat exchanger; and a control part that controls a flow of the indoor air to be introduced into an air-conditioning case, whereby the heat pump system can minimize influences of the outdoor air of low temperature even when the outdoor temperature is below zero, enhance the operation and the heating performance of the heat pump system by collecting waste heat of the vehicle electric devices and heat sources of the indoor air, and increase the mileage of the vehicle by minimizing operation of an electric heater.

主权项

1. A heat pump system for a vehicle comprising:
a compressor mounted on a refrigerant circulation line for compressing and discharging refrigerant; a first indoor heat exchanger mounted inside an air-conditioning case and connected with the refrigerant circulation line of an outlet side of the compressor to thereby exchange heat between air flowing inside the air-conditioning case and refrigerant discharged from the compressor; a second indoor heat exchanger mounted inside the air-conditioning case and connected with the refrigerant circulation line of an inlet side of the compressor to thereby exchange heat between the air flowing inside the air-conditioning case and the refrigerant supplied to the compressor; an outdoor heat exchanger mounted on the outside of the air-conditioning case for exchanging heat between the refrigerant circulating the refrigerant circulation line and the outdoor air; a first expansion means mounted on the refrigerant circulation line of an inlet side of the second indoor heat exchanger to expand the refrigerant supplied to the second indoor heat exchanger; a first bypass line mounted to connect the refrigerant circulation line of an inlet side of the first expansion means with the refrigerant circulation line of an outlet side of the second indoor heat exchanger, so that the refrigerant bypasses the first expansion means and the second indoor heat exchanger; a first direction-switching valve mounted at a branch point between the first bypass line and the refrigerant circulation line to thereby convert a flow direction of the refrigerant so that the refrigerant passing through the outdoor heat exchanger flows toward the first bypass line and the first expansion means; a heat supply means mounted on the first bypass line for supplying heat to the refrigerant flowing along the first bypass line; a second expansion means mounted on the refrigerant circulation line of the inlet side of the outdoor heat exchanger to selectively expand the refrigerant supplied to the outdoor heat exchanger according to the air-conditioning mode or the heat pump mode; a branch line adapted for connecting the refrigerant circulation with the first bypass line of the inlet side of the heat supply means so that some of the refrigerant supplied to the heat supply means of the first bypass line flows toward the second indoor heat exchanger or some of the refrigerant supplied to the second indoor heat exchanger flows toward the heat supply means of the first bypass line; a flow control valve mounted on the branch line to control an amount of refrigerant; wherein the branch line extends between a first branch point and a second branch point, thereby the branch line fluidly connects the first branch point with the second branch point, wherein the first branch point is located between the outlet of the first switching valve and the inlet of the heat supply means, and wherein the second branch point is located between the outlet of the first expansion means and the inlet of the second indoor heat exchanger.