Heat pump system for vehicle

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

• a compressor configured to compress a refrigerant;
• a condenser connected to the compressor through a refrigerant line and configured to condense the refrigerant by heat-exchanging the refrigerant supplied from the compressor with a first coolant;
• an evaporator connected to the condenser through the refrigerant line and configured to evaporate the refrigerant by heat-exchanging the refrigerant supplied from the condenser with the first coolant;
• an accumulator provided on the refrigerant line between the evaporator and the compressor;
• a gas injection device connected to the refrigerant line between the condenser and the evaporator and configured to selectively expand and flow the refrigerant supplied from the condenser and to selectively supply a portion of the supplied refrigerant to the compressor to increase a flow rate of the refrigerant circulating in the refrigerant line;
• a first refrigerant connection line disposed between the compressor and the evaporator, the first refrigerant connection line having a first end connected to the refrigerant line and a second end connected to the gas injection device;
• a chiller provided on the first refrigerant connection line and configured to adjust a temperature of the first coolant by heat-exchanging the refrigerant introduced through the first refrigerant connection line with a second coolant;
• and
• a second refrigerant connection line disposed between the compressor and the condenser, the second refrigerant connection line having a first end connected to the refrigerant line and a second end connected to the gas injection device;
• wherein the gas injection device comprises:
• a gas-liquid separator configured to separate and selectively discharge a gaseous refrigerant and a liquid refrigerant from the refrigerant, wherein the refrigerant is internally introduced;
• a supply portion connected to the condenser through the refrigerant line and configured to receive the refrigerant supplied from the condenser;
• a first expansion valve connected to the second refrigerant connection line, provided between the gas-liquid separator and the supply portion, and configured to selectively expand the refrigerant supplied to the second refrigerant connection line or the refrigerant supplied to the supply portion and to supply the expanded refrigerant to the gas-liquid separator;
• a second expansion valve provided between the gas-liquid separator and the supply portion and configured to either selectively expand the refrigerant supplied to the supply portion and supply the expanded refrigerant to the chiller or to supply the refrigerant supplied from the gas-liquid separator to the chiller;
• a third expansion valve provided between the gas-liquid separator and the supply portion and configured to either selectively expand the refrigerant supplied to the supply portion and supply the expanded refrigerant to the evaporator or to supply the refrigerant supplied from the gas-liquid separator to the evaporator;
• a discharge portion connecting the gas-liquid separator to the second expansion valve and the third expansion valve and configured to discharge the refrigerant from the gas-liquid separator to the second expansion valve or the third expansion valve;
• a first supply line connecting the gas-liquid separator to the compressor and configured to selectively supply the gaseous refrigerant from the gas-liquid separator to the compressor;
• a control valve provided on the first supply line;
• and
• a second supply line having a first end connected to the control valve and a second end connected to the accumulator.

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

• a compressor configured to compress a refrigerant;
• a condenser connected to the compressor through a refrigerant line and configured to condense the refrigerant by heat-exchanging the refrigerant supplied from the compressor with a first coolant;
• an evaporator connected to the condenser through the refrigerant line and configured to evaporate the refrigerant by heat-exchanging the refrigerant supplied from the condenser with the first coolant;
• a gas injection device connected to the refrigerant line between the condenser and the evaporator and configured to selectively expand and flow the refrigerant supplied from the condenser and to selectively supply a portion of the supplied refrigerant to the compressor to increase a flow rate of the refrigerant circulating in the refrigerant line;
• a first refrigerant connection line disposed between the compressor and the evaporator, the first refrigerant connection line having a first end connected to the refrigerant line and a second end connected to the gas injection device;
• a chiller provided on the first refrigerant connection line and configured to adjust a temperature of the first coolant by heat-exchanging the refrigerant introduced through the first refrigerant connection line with a second coolant;
• a second refrigerant connection line disposed between the compressor and the condenser, the second refrigerant connection line having a first end connected to the refrigerant line and a second end connected to the gas injection device;
• and
• a cooling apparatus comprising a radiator, an electrical component, and a battery module through which the first coolant circulates;
• wherein the condenser is connected to the radiator through a first line for flowing the first coolant and is connected to a heater core through a second line for flowing the first coolant;
• wherein the evaporator is connected to the radiator through a third line for flowing the first coolant and is connected to a cabin cooler through a fourth line for flowing the first coolant;
• and
• wherein the chiller is connected to the electrical component through a fifth line for flowing the first coolant and is connected to the battery module through a sixth line for flowing the first coolant;
• and
• wherein the gas injection device comprises:
• a gas-liquid separator configured to separate and selectively discharge a gaseous refrigerant and a liquid refrigerant from the refrigerant, wherein the refrigerant is internally introduced;
• a supply portion connected to the condenser through the refrigerant line and configured to receive the refrigerant supplied from the condenser;
• a first expansion valve connected to the second refrigerant connection line, provided between the gas-liquid separator and the supply portion, and configured to selectively expand the refrigerant supplied to the second refrigerant connection line or the refrigerant supplied to the supply portion and to supply the expanded refrigerant to the gas-liquid separator;
• a second expansion valve provided between the gas-liquid separator and the supply portion and configured to either selectively expand the refrigerant supplied to the supply portion and supply the expanded refrigerant to the chiller or to supply the refrigerant supplied from the gas-liquid separator to the chiller;
• a third expansion valve provided between the gas-liquid separator and the supply portion and configured to either selectively expand the refrigerant supplied to the supply portion and supply the expanded refrigerant to the evaporator or to supply the refrigerant supplied from the gas-liquid separator to the evaporator;
• a discharge portion connecting the gas-liquid separator to the second expansion valve and the third expansion valve and configured to discharge the refrigerant from the gas-liquid separator to the second expansion valve or the third expansion valve;
• and
• a supply line connecting the gas-liquid separator to the compressor and configured to selectively supply the gaseous refrigerant from the gas-liquid separator to the compressor.