Heat pump system for vehicle

A heat pump system for a vehicle, the system comprising:

• a refrigerant line;
• a compressor configured to compress a refrigerant;
• a condenser connected to the compressor through the refrigerant line;
• a heat exchanger connected to the condenser through the refrigerant line and configured to condense or evaporate the refrigerant;
• a first expansion valve connected to the heat exchanger through the refrigerant line;
• an evaporator connected to the first expansion valve through the refrigerant line;
• a first refrigerant connection line having a first end connected to the refrigerant line between the compressor and the evaporator and a second end connected to the refrigerant line between the heat exchanger and the first expansion valve;
• a chiller disposed on the first refrigerant connection line and configured to control a temperature of a coolant by selectively exchanging heat between the refrigerant introduced into the first refrigerant connection line and the coolant;
• a second expansion valve disposed on the first refrigerant connection line upstream of the chiller;
• and
• a gas injection device connected to the refrigerant line and configured to selectively expand and flow the refrigerant supplied from the condenser or the heat exchanger and to selectively supply a portion of the refrigerant to the compressor to increase a flow rate of the refrigerant circulating in the refrigerant line, wherein the flow of the refrigerant is controlled according to a mode for controlling a temperature of an interior of the vehicle or a temperature of a battery module, and wherein the chiller is connected to the battery module through a coolant line configured to allow the coolant to circulate therethrough, wherein, in a state of cooling the battery module, the coolant line is in an open state to connect the chiller and the battery module.

A heat pump system for a vehicle, the system comprising:

• a refrigerant line;
• a compressor configured to compress a refrigerant;
• a condenser connected to the compressor through the refrigerant line;
• a heat exchanger connected to the condenser through the refrigerant line and configured to condense or evaporate the refrigerant;
• a first expansion valve connected to the heat exchanger through the refrigerant line;
• a first valve disposed on the refrigerant line between the heat exchanger and the first expansion valve;
• an evaporator connected to the first expansion valve through the refrigerant line;
• a first refrigerant connection line having a first end connected to the refrigerant line between the compressor and the evaporator and a second end connected to the refrigerant line between the heat exchanger and the first expansion valve;
• a chiller disposed on the first refrigerant connection line and configured to control a temperature of a coolant by selectively exchanging heat between the refrigerant introduced into the first refrigerant connection line and the coolant;
• a second expansion valve disposed on the first refrigerant connection line upstream of the chiller;
• and
• a gas injection device connected to the refrigerant line and configured to selectively expand and flow the refrigerant supplied from the condenser or the heat exchanger and to selectively supply a portion of the refrigerant to the compressor to increase a flow rate of the refrigerant circulating in the refrigerant line, wherein the flow of the refrigerant is controlled according to a mode for controlling a temperature of an interior of the vehicle or a temperature of a battery module, wherein the gas injection device comprises:
• a first gas-liquid separator disposed on the refrigerant line between the condenser and the heat exchanger and configured to selectively separate the refrigerant into a gaseous refrigerant and a liquid refrigerant and to selectively discharge the gaseous refrigerant and the liquid refrigerant;
• a third expansion valve disposed on the refrigerant line between the condenser and the first gas-liquid separator;
• a fourth expansion valve disposed on the refrigerant line between the first gas-liquid separator and the heat exchanger;
• a second refrigerant connection line having a first end connected to the first gas-liquid separator and a second end connected to the first valve and the first expansion valve;
• a second gas-liquid separator disposed on the second refrigerant connection line;
• a third refrigerant connection line having a first end connected to the refrigerant line between the heat exchanger and the first valve and a second end connected to the second gas-liquid separator;
• and
• a fifth expansion valve disposed on the third refrigerant connection line;
• wherein the first expansion valve, the second expansion valve, and the fifth expansion valve comprise 2-way expansion valves that are configured to be selectively operated in the mode and to selectively expand the refrigerant while controlling the flow of the refrigerant;
• and
• wherein the third expansion valve and the fourth expansion valve comprise 3-way electronic expansion valves that are configured to be selectively operated in the mode and to selectively expand the refrigerant while controlling the flow of the refrigerant.