HEAT PUMP SYSTEM FOR VEHICLE

摘要

The present invention relates to a vehicle heat pump system and, more particularly, to a vehicle heat pump system comprising: a three-way valve section connected to a refrigerant circulation line on the inlet side of an outdoor heat exchanger such that a circulating refrigerant selectively bypasses the outdoor heat exchanger; an on/off valve section connected to the inlet side of an evaporator bypass line such that the bypass line is on or off; a connection block for connecting the three-way valve section and the on-off valve section with a refrigerant circulation line on the outlet side of the outdoor heat exchanger to intercommunicate with each other; and a compound valve device into which an expansion means is built, the expansion means being connected to the inlet side of the three-way valve section in order to selectively expand the refrigerant discharged from an indoor heat exchanger. According to the present invention, the compound valve device controls the refrigerant such that all functions (modes) of the heat pump system can be performed, and the refrigerant circulation line (piping) has a simplified structure as multiple components and functions are integrated into the single compound valve device so as to render the heat pump system compact. Also, space can be ensured in a narrow vehicle engine compartment and both workability and fuel efficiency can be improved due to reduced weight.