Heat pump system for a vehicle

Abstract

Disclosed is a heat pump system for a vehicle, including: an air conditioning device that circulates refrigerant through a refrigerant line; a coolant circulation device that circulates coolant through a coolant line; a first refrigeration machine connected to the coolant circulation device through the coolant line, connected to the refrigerant line through a first refrigerant connection line, and performing heat exchange between selectively flowing coolant and refrigerant supplied from the air conditioning device to control the temperature of the coolant; and a second refrigeration machine connected to the coolant circulation device through the coolant line, connected to a second refrigerant connection line so that refrigerant is supplied from the air conditioning device, and increasing the temperature of the refrigerant by performing heat exchange between the coolant and the refrigerant so that waste heat is recovered from the coolant selectively flowing therein, wherein the air conditioning device includes a gas injection portion that branches a portion of refrigerant passing through a condenser to a compressor to increase the flow rate of refrigerant circulating in the refrigerant line.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2020-0123944, filed on September 24, 2020, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a heat pump system for a vehicle, and more specifically, to a heat pump system for a vehicle that controls the temperature of a battery module by means of a refrigeration unit that uses refrigerant and coolant for heat exchange, and improves heating efficiency by means of another refrigeration unit that recovers waste heat from electrical components. Background Technology

[0004] Typically, air conditioning systems for vehicles include air conditioning units that circulate refrigerant to heat or cool the vehicle interior.

[0005] Regardless of changes in the outside temperature, the air conditioning system can maintain comfortable indoor conditions by keeping the vehicle's interior temperature at an appropriate level. The air conditioning system is configured to heat or cool the vehicle interior through heat exchange between the condenser and evaporator as the refrigerant discharged by driving the compressor is recirculated back to the compressor via the condenser, receiver-drier, expansion valve, and evaporator.

[0006] That is, in the summer cooling mode, the air conditioning unit condenses the high-temperature and high-pressure gaseous refrigerant compressed by the compressor through the condenser, and then evaporates it through the evaporator after passing through the receiver dryer and expansion valve to reduce the indoor temperature and humidity.

[0007] Recently, with increasing attention to energy efficiency and environmental pollution, there is a need to develop environmentally friendly vehicles that can essentially replace vehicles with internal combustion engines. Environmentally friendly vehicles are generally classified into electric vehicles that typically use fuel cells or electricity as a power source and hybrid vehicles that use both engines and batteries.

[0008] Unlike the air conditioning systems in ordinary vehicles, environmentally friendly electric and hybrid vehicles do not use separate heaters, and the air conditioning systems used in environmentally friendly vehicles are usually called heat pump systems.

[0009] In electric vehicles using fuel cells, the chemical reaction of oxygen and hydrogen can be converted into electrical energy to generate driving force. In this process, the chemical reaction in the fuel cell generates heat energy. Therefore, it is necessary to effectively eliminate the generated heat to ensure the performance of the fuel cell.

[0010] In a hybrid vehicle, driving force is generated by driving a motor together with an engine actuated by ordinary fuel using electric power supplied from a fuel cell or a battery, and thus, only when heat generated by the fuel cell or the battery and the motor is effectively removed, the performance of the motor can be secured.

[0011] Therefore, in the related art hybrid vehicle or electric vehicle, the battery cooling system, the cooling component, and the heat pump system should be configured as separate circuits, respectively, to prevent heat generation by the motor, the electrical component, and the battery including the fuel cell.

[0012] Therefore, the size and weight of the cooling module provided at the front of the vehicle are increased, and the layout of connection pipes for supplying refrigerant or coolant to the heat pump system, the cooling component, and the battery cooling system in the engine room becomes complicated.

[0013] In addition, the battery cooling system for heating or cooling the battery according to the state of the vehicle is separately provided so that the battery can operate in an optimal state, and thus, a plurality of valves connecting the battery cooling system and the respective connection pipes are applied, and thus, noise and vibration can be transmitted to the vehicle room, reducing ride comfort.

[0014] In addition, when heating the room of the vehicle, heating performance is degraded due to a lack of a heat source, power consumption is increased due to the use of an electric heater, and power consumption of the compressor is increased.

[0015] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure, and therefore, can contain information that does not form the prior art that is already known in this country to those skilled in the art. SUMMARY

[0016] The present disclosure aims to provide a heat pump system for a vehicle which can control the temperature of a battery module by using one refrigerating machine which exchanges heat with refrigerant and coolant, thereby simplifying the system.

[0017] In addition, the present disclosure aims to provide a heat pump system for a vehicle which can improve heating efficiency by using another refrigerating machine which recovers waste heat of an electrical component in a vehicle heating mode.

[0018] In addition, the present disclosure aims to provide a heat pump system for a vehicle which can increase the flow rate of refrigerant by applying a gas injection portion selectively operated in a vehicle heating mode or a dehumidification mode, to maximize heating performance.

[0019] Embodiments of the present disclosure provide a heat pump system for a vehicle, including: an air conditioning device circulating refrigerant through a refrigerant line; a coolant circulation device circulating coolant through a coolant line; a first refrigeration machine connected to the coolant circulation device through the coolant line, connected to the refrigerant line through a first refrigerant connection line, and exchanging heat between selectively flowed-in coolant and refrigerant supplied from the air conditioning device to control a temperature of the coolant; and a second refrigeration machine connected to the coolant circulation device through the coolant line, connected to a second refrigerant connection line so that refrigerant is supplied from the air conditioning device, and increasing a temperature of the refrigerant by exchanging heat between the coolant and the refrigerant so that waste heat is recovered from the coolant selectively flowed into the second refrigeration machine, wherein the air conditioning device includes a gas injection portion that branches a portion of refrigerant passing through a condenser to a compressor to increase a flow rate of refrigerant circulating in the refrigerant line.

[0020] The air conditioning device can include: an HVAC module including an evaporator connected to the HVAC module through a refrigerant line, and a switch door selectively flowing outside air passing through the evaporator into a heater according to a cooling mode, a heating mode, and a dehumidification mode of the vehicle; a condenser connected to the coolant circulation device through a coolant line so that coolant passes through, and exchanging heat between refrigerant supplied through the refrigerant line and the coolant; a compressor connected between the evaporator and the condenser through the refrigerant line; a heat exchanger provided in the refrigerant line between the condenser and the evaporator; a first expansion valve provided in the refrigerant line connecting the heat exchanger and the evaporator; a second expansion valve provided in the first refrigerant connection line; and a receiver provided in the refrigerant line between the evaporator and the compressor.

[0021] One end of the first refrigerant connection line can be connected to the refrigerant line between the heat exchanger and the first expansion valve, the other end of the first refrigerant connection line can be connected to the refrigerant line between the receiver and the evaporator, one end of the second refrigerant connection line can be connected to the first refrigerant connection line through a refrigerant valve between the second expansion valve and the first refrigeration machine so that refrigerant passing through the heat exchanger passes through the second refrigeration machine, and the other end of the second refrigerant connection line can be connected to the receiver.

[0022] The second expansion valve can selectively expand refrigerant passing through the heat exchanger according to a mode of the vehicle to flow the refrigerant into the first refrigerant connection line or to pass the refrigerant through the first refrigerant connection line.

[0023] The gas injection portion can include a gas-liquid separator disposed in the refrigerant line between the condenser and the heat exchanger, the gas-liquid separator being configured to separate and selectively discharge gaseous refrigerant and liquid refrigerant among the refrigerant passing through the condenser; a supply line connecting the gas-liquid separator and the compressor, the supply line being configured to selectively supply the gaseous refrigerant from the gas-liquid separator to the compressor; a control valve disposed in the supply line; a third expansion valve disposed in the refrigerant line between the condenser and the gas-liquid separator; and a fourth expansion valve disposed in the refrigerant line between the gas-liquid separator and the heat exchanger.

[0024] When the gas injection portion is operated in the heating mode of the vehicle, the third expansion valve can expand the refrigerant supplied from the condenser and supply the refrigerant to the gas-liquid separator, and the fourth expansion valve can expand the refrigerant supplied from the gas-liquid separator and flow the refrigerant into the refrigerant line.

[0025] When the gas injection portion is not operated in the heating mode of the vehicle, the third expansion valve can pass the refrigerant supplied from the condenser, and the fourth expansion valve can expand the refrigerant passing through the gas-liquid separator and supply the refrigerant to the heat exchanger.

[0026] When the gas injection portion is not operated in the dehumidification mode of the vehicle, the third expansion valve can pass the refrigerant supplied from the condenser, and the fourth expansion valve can pass the refrigerant passing through the gas-liquid separator and supply the refrigerant to the heat exchanger.

[0027] When the gas injection portion is operated in the dehumidification mode of the vehicle, the third expansion valve can expand the refrigerant supplied from the condenser and supply the refrigerant to the gas-liquid separator, and the fourth expansion valve can selectively expand or pass the refrigerant passing through the gas-liquid separator according to whether the refrigerant is expanded in the first expansion valve.

[0028] In the cooling mode of the vehicle, the third expansion valve and the fourth expansion valve can not expand the refrigerant supplied from the condenser and flow the refrigerant through the refrigerant line.

[0029] The control valve can operate such that the supply line can be opened when the gas injection portion is operated.

[0030] The first expansion valve, the second expansion valve, the third expansion valve, and the fourth expansion valve can be electronic expansion valves that selectively expand the refrigerant while controlling the flow of the refrigerant.

[0031] The heat exchanger can additionally condense or evaporate the refrigerant through heat exchange of the refrigerant condensed in the condenser with the outside air according to the selective operation of the fourth expansion valve.

[0032] When cooling the battery module in the cooling mode of the vehicle, the coolant circulation device can supply coolant to the condenser and the first chiller through the coolant line connected to the condenser and the first chiller, in the air conditioning device, in a state in which the first refrigerant connection line is opened and the second refrigerant connection line is closed by operation of the second expansion valve and the refrigerant valve, the refrigerant can circulate along the refrigerant line and the first refrigerant connection line, the first expansion valve and the second expansion valve can expand the coolant such that the expanded refrigerant can be supplied to the evaporator and the first chiller, respectively, and the heat exchanger can condense the refrigerant by heat exchange with the outside air.

[0033] When recovering heat from an external heat source and waste heat of electrical components in the heating mode of the vehicle, the coolant circulation device can supply coolant to the heater, the condenser, and the second chiller through the coolant line connected to the heater, the condenser, and the second chiller, can supply the coolant, which is raised in temperature while passing through the second chiller and the condenser from the coolant circulation device, to the heater, in the air conditioning device, the refrigerant line connecting the heat exchanger and the evaporator can be closed by the first expansion valve, the portion of the first refrigerant connection line connected to the first chiller can be closed by the refrigerant valve, the second chiller connection line can be opened by the refrigerant valve, the second expansion valve can selectively expand and supply the refrigerant to the second chiller, the heat exchanger can evaporate the refrigerant by heat exchange with the outside air, and the gas injection portion can be selectively operated.

[0034] In the dehumidification mode of the vehicle, the coolant circulation device can supply coolant to the heater and the condenser through the coolant line connected to the heater and the condenser, can supply the coolant, which is raised in temperature while passing through the condenser from the coolant circulation device, to the heater, in the air conditioning device, in a state in which the first refrigerant connection line is closed and the second chiller connection line is closed by operation of the second expansion valve, the refrigerant can circulate along the refrigerant line, the first expansion valve can expand the refrigerant such that the expanded refrigerant is supplied to the evaporator, and the gas injection portion can be selectively operated.

[0035] The heat exchanger can selectively condense or evaporate the refrigerant passing through the condenser according to whether the gas injection portion is operated.

[0036] The gas injection portion can include a plate-shaped heat exchanger provided in the refrigerant line between the condenser and the heat exchanger, a supply line including one end connected to the refrigerant line between the condenser and the plate-shaped heat exchanger and the other end connected to the compressor through the plate-shaped heat exchanger, a third expansion valve provided in the supply line at a front end of the plate-shaped heat exchanger, and a fourth expansion valve provided in the refrigerant line between the plate-shaped heat exchanger and the heat exchanger.

[0037] The condenser can be a water-cooled heat exchanger, and the heat exchanger can be an air-cooled heat exchanger.

[0038] The gas injection portion can be selectively operated in a heating or dehumidification mode of the vehicle.

[0039] As described above, the heat pump system for a vehicle according to an embodiment of the disclosure can control the temperature of the battery module according to the vehicle mode by using one refrigeration machine that exchanges heat with the refrigerant and the coolant, thereby achieving simplification of the system.

[0040] In addition, the heat pump system for a vehicle according to an embodiment of the disclosure can improve heating efficiency by using another refrigeration machine that recovers waste heat of the electrical components in a heating mode of the vehicle and selectively using an external heat source or the waste heat of the electrical components.

[0041] In addition, according to an embodiment of the disclosure, by effectively controlling the temperature of the battery module, the optimal performance of the battery module can be exhibited, and the total mileage of the vehicle can be increased by effectively managing the battery module.

[0042] In addition, according to an embodiment of the disclosure, the flow rate of the refrigerant can be selectively increased in a vehicle heating mode or a dehumidification mode by applying a gas injection portion to maximize heating performance.

[0043] In addition, according to an embodiment of the disclosure, manufacturing costs and weight can be reduced and space utilization can be improved by simplifying the entire system. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A block diagram of a heat pump system for a vehicle according to an embodiment of the disclosure is shown.

[0045] Figure 2 A block diagram of a gas injection portion applied to a heat pump system for a vehicle according to another embodiment of the disclosure is shown.

[0046] Figure 3 An operation state diagram of a heat pump system for a vehicle according to an embodiment of the disclosure is shown, in which a battery module is cooled by using a refrigerant in a cooling mode of the vehicle.

[0047] Figure 4 An operation state diagram of a heat pump system for a vehicle according to an embodiment of the disclosure is shown, in which heat from an external heat source and waste heat of electrical components are recovered according to a heating mode.

[0048] Figure 5 An operation state diagram of a dehumidification mode in a heat pump system for a vehicle according to an embodiment of the disclosure is shown. DETAILED DESCRIPTION

[0049] Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0050] Since the embodiments described in the specification and the configurations shown in the drawings are only the most preferred embodiments and configurations of the present disclosure, they do not represent all the technical ideas of the present disclosure, and it should be understood that various equivalent forms and modified examples of the embodiments are possible when the present application is filed.

[0051] In order to clearly describe the present disclosure, parts irrelevant to the description are omitted, and the same or similar constituent elements are denoted by the same reference numerals throughout the specification.

[0052] Since the size and thickness of each configuration shown in the drawings are arbitrarily shown for the convenience of description, the present disclosure is not necessarily limited to the configurations shown in the drawings, and an increased thickness is shown in order to clearly show several parts and regions.

[0053] Furthermore, throughout the specification, unless explicitly described to the contrary, the words "comprise" and variations such as "comprises" or "comprising" will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0054] Furthermore, the terms such as "…unit", "…device", "…part", and "…member" described in the specification refer to a unit having an integrated configuration of at least one function or operation.

[0055] Figure 1 A block diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure is shown.

[0056] The heat pump system for a vehicle according to an embodiment of the present disclosure can control the temperature of a battery module (not shown) by a first refrigerating machine 40 that exchanges heat with a refrigerant and a coolant, and improve heating efficiency by a second refrigerating machine 50 that recovers waste heat from an electrical component (not shown).

[0057] Here, in the heat pump system, a coolant circulating device 3 that supplies a coolant to an electrical component and a battery module in an electric vehicle and an air conditioning device 10 for cooling and heating an indoor room can be linked to each other.

[0058] That is, with reference to Figure 1 , the heat pump system can include the coolant circulating device 3, the air conditioning device 10, the first refrigerating machine 40, and the second refrigerating machine 50.

[0059] First, the coolant circulating device 3 circulates a coolant through a coolant line 5. The coolant circulating device 3 can be connected to an electrical component and a battery module, which are not shown, through the coolant line 5.

[0060] In addition, the coolant circulation device 3 can include a radiator, a water pump, and a coolant tank, which are not shown.

[0061] The electrical components (not shown) can include an electric power control unit (EPCU), a motor, an inverter, and a power conversion device such as an on-board charger (OBC), and an autonomous driving controller.

[0062] The electrical components as described above can be connected to the coolant line 5 to be cooled in a water-cooled manner.

[0063] That is, when waste heat of the electrical components (not shown) is recovered in a heating mode of the vehicle, heat generated from the power conversion device of the EPCU, the motor, the inverter, or the OBC can be recovered.

[0064] The coolant circulation device 3 circulates the coolant cooled by the radiator along the coolant line 5 by the operation of the water pump, thereby cooling the electrical components (not shown) or the battery module (not shown) to prevent overheating.

[0065] In the present embodiment, the air conditioning device 10 includes a heating, ventilation, and air conditioning (HVAC) module 12, a condenser 13, a heat exchanger 14, a first expansion valve 15, an evaporator 16 and a receiver 17, a compressor 19, a first refrigerant connection line 21, a second refrigerant connection line 22, and a second expansion valve 23 connected by a refrigerant line 11.

[0066] First, the HVAC module 12 includes the evaporator 16 connected by the refrigerant line 11 and a switch door 12b for selectively flowing external air passing through the evaporator 16 into a heater 12a according to a cooling, heating, and dehumidification mode of the vehicle.

[0067] That is, in a heating mode of the vehicle, the switch door 12b is opened to allow external air passing through the evaporator 16 to flow into the heater 12a.

[0068] On the contrary, in a cooling mode of the vehicle, the switch door 12b closes the heater 12a side, so that external air cooled by passing through the evaporator 16 directly flows into the inside of the vehicle.

[0069] In the present embodiment, the condenser 13 is connected to the refrigerant line 11 so that the refrigerant passes through the condenser 13. The condenser 13 can be connected to the coolant circulation device 3 by the coolant line 5.

[0070] That is, the condenser 13 can exchange heat with the coolant supplied through the coolant line 5 to condense the refrigerant. That is, the condenser 13 can be a water-cooled heat exchanger in which the coolant flows into the condenser.

[0071] The condenser 13 configured as described above can exchange heat between the refrigerant supplied from the compressor 19 and the coolant supplied from the coolant circulating device 3 to condense the refrigerant.

[0072] In the present embodiment, the heat exchanger 14 can be provided in the refrigerant line 11 between the condenser 13 and the evaporator 16.

[0073] The first expansion valve 15 is provided in the refrigerant line 11 between the heat exchanger 14 and the evaporator 16. The first expansion valve 15 receives the refrigerant passing through the heat exchanger 14 to expand the refrigerant.

[0074] The accumulator 17 is provided in the refrigerant line 11 between the evaporator 16 and the compressor 19.

[0075] The accumulator 17 improves the efficiency and durability of the compressor 19 by supplying only the gaseous refrigerant to the compressor 19.

[0076] In the present embodiment, one end of the first refrigerant connection line 21 is connected to the refrigerant line 11 between the heat exchanger 14 and the first expansion valve 15. In addition, the other end of the first refrigerant connection line 21 can be connected to the refrigerant line 11 between the evaporator 16 and the accumulator 17.

[0077] Meanwhile, the second expansion valve 23 can be provided in the first refrigerant connection line 21.

[0078] The second expansion valve 23 can selectively expand the refrigerant passing through the heat exchanger 14 to flow the refrigerant into the first refrigerant connection line 21 or pass the refrigerant through the first refrigerant connection line 21 according to the vehicle mode.

[0079] When the battery module (not shown) is cooled by using the coolant that is heat-exchanged with the refrigerant, the second expansion valve 23 expands the refrigerant introduced through the first refrigerant connection line 21 and flows into the first refrigerator 40.

[0080] That is, the second expansion valve 23 expands the refrigerant discharged from the heat exchanger 14 and flows into the first refrigerator 40 or the second refrigerator 50 in a state of a reduced temperature, so that the water temperature of the coolant passing through the inside of the first refrigerator 40 or the second refrigerator 50 can be further reduced.

[0081] Accordingly, the coolant of which the water temperature is reduced while passing through the first refrigerator 40 can flow into the battery module (not shown) and cool the battery module.

[0082] In addition, when waste heat is recovered from the electrical components (not shown) in the heating mode or the dehumidification mode of the vehicle, the second expansion valve 23 can selectively expand the refrigerant and flow it into the first refrigerant connection line 21 or not expand the refrigerant and flow it into the first refrigerant connection line 21.

[0083] Meanwhile, one end of the second refrigerant connection line 22 is connected to the first refrigerant connection line 21 between the second expansion valve 23 and the first refrigerator 40 through the refrigerant valve 24, so that the refrigerant passing through the heat exchanger 14 passes through the second refrigerator 50.

[0084] In addition, the other end of the second refrigerant connection line 22 can be connected to the accumulator 17.

[0085] In the present embodiment, the second refrigerant connection line 22 is selectively opened and closed according to the refrigerant valve 24, and the second refrigerant connection line 22 can supply the refrigerant expanded in the second expansion valve 23 to the second refrigerator 50.

[0086] That is, when the first refrigerator 40 is used to cool the battery module or the second refrigerator 50 is used to recover waste heat from the electrical components, the refrigerant valve 24 can selectively open and close the first refrigerant connection line 21 and the second refrigerant connection line 22.

[0087] Therefore, the first refrigerant connection line 21 and the second refrigerant connection line 22 can both be opened or closed according to the operation of the refrigerant valve 24, and a selected line can be individually opened and closed.

[0088] In addition, the refrigerant expanded by the second expansion valve 23 can be selectively supplied to the first refrigerator 40 and the second refrigerator 50 through the first refrigerant connection line 21 or the second refrigerant connection line 22 according to the operation of the refrigerant valve 24.

[0089] In addition, the compressor 19 is connected between the evaporator 16 and the condenser 13 through the refrigerant line 11. The compressor 19 can compress the gaseous refrigerant, and supply the compressed refrigerant to the condenser 13.

[0090] Meanwhile, in the present embodiment, the heat pump system can further include a gas injection portion 30.

[0091] The gas injection portion 30 is provided in the air conditioning device 10. The gas injection portion 30 can bypass a portion of the refrigerant passing through the condenser 13 to the compressor 19 to increase the flow rate of the refrigerant circulating in the refrigerant line 11.

[0092] The gas injection portion 30 configured as described above can be selectively operated in the heating or dehumidification mode of the vehicle.

[0093] On the contrary, the gas injection portion 30 can be stopped in the cooling mode of the vehicle.

[0094] Here, the gas injection portion 30 includes a gas-liquid separator 31, a supply line 32, a control valve 33, a third expansion valve 34, and a fourth expansion valve 35.

[0095] First, the gas-liquid separator 31 is provided in the refrigerant line 11 between the condenser 13 and the heat exchanger 14.

[0096] The gas-liquid separator 31 can separate the gaseous refrigerant and the liquid refrigerant of the refrigerant that has completed heat exchange by passing through the condenser 13 to be selectively discharged.

[0097] The supply line 32 connects the gas-liquid separator 31 and the compressor 19. The supply line 32 can selectively supply the gaseous refrigerant from the gas-liquid separator 31 to the compressor 19.

[0098] That is, the supply line 32 can connect the gas-liquid separator 31 and the compressor 19 so that the gaseous refrigerant passing through the gas-liquid separator 31 can be selectively flowed into the compressor 19.

[0099] In the present embodiment, the control valve 33 is provided in the supply line 32. The control valve 33 can selectively open the supply line 32 according to the vehicle mode.

[0100] That is, the control valve 33 can be operated and open the supply line 32 when the gas injection portion 30 is operated.

[0101] Here, the gas-liquid separator 31 can supply the gaseous refrigerant to the compressor 19 through the supply line 32 opened by the operation of the control valve 33. In addition, the gas-liquid separator 31 can supply the liquid refrigerant to the heat exchanger 14.

[0102] The third expansion valve 34 is provided in the refrigerant line 11 between the condenser 13 and the gas-liquid separator 31.

[0103] In addition, the fourth expansion valve 35 can be provided in the refrigerant line 11 between the gas-liquid separator 31 and the heat exchanger 14.

[0104] That is, when the gas injection portion 30 is operated in the heating mode of the vehicle, the third expansion valve 34 can expand and supply the refrigerant supplied from the condenser 13 to the gas-liquid separator 31.

[0105] In addition, the fourth expansion valve 35 can expand and flow the refrigerant supplied from the gas-liquid separator 31 into the refrigerant line 11.

[0106] On the contrary, when the gas injection portion 30 is not operated in the heating mode of the vehicle, the third expansion valve 34 can pass the refrigerant supplied from the condenser 13.

[0107] Further, the fourth expansion valve 35 can expand and supply the refrigerant passing through the gas-liquid separator 31 to the heat exchanger 14.

[0108] Meanwhile, when the gas injection portion 30 is operated in the dehumidification mode of the vehicle, the third expansion valve 34 can expand and supply the refrigerant supplied from the condenser 13 to the gas-liquid separator 31.

[0109] Further, the fourth expansion valve 35 can selectively expand or pass the refrigerant passing through the gas-liquid separator 31 according to whether the refrigerant of the first expansion valve 15 is expanded.

[0110] In contrast, when the gas injection portion 30 is not operated in the dehumidification mode of the vehicle, the third expansion valve 34 can pass the refrigerant supplied from the condenser 13.

[0111] Further, the fourth expansion valve 35 can pass the refrigerant passing through the gas-liquid separator 31 and supply it to the heat exchanger 14.

[0112] Further, in the cooling mode of the vehicle, the third expansion valve 34 and the fourth expansion valve 35 can not expand the refrigerant supplied from the condenser 13 and make it flow into the refrigerant line 11.

[0113] Here, the heat exchanger 14 can selectively condense or evaporate the refrigerant passing through the condenser 13 according to whether the gas injection portion 30 is operated.

[0114] Specifically, the heat exchanger 14 additionally condenses or evaporates the refrigerant discharged from the gas-liquid separator 31 through heat exchange with the outside air of the refrigerant discharged from the gas-liquid separator 31 according to the selective operation of the fourth expansion valve 35.

[0115] When the heat exchanger 14 condenses the refrigerant, the heat exchanger 14 further condenses the refrigerant condensed in the condenser 13, so that the supercooling of the refrigerant can be increased, and thus the coefficient of performance (COP), that is, the coefficient of the cooling capacity with respect to the power required for the compressor, can be improved.

[0116] Meanwhile, the gas injection portion 30 can further include a separate connection line (not shown) having one end connected to the refrigerant line 11 between the condenser 13 and the third expansion valve 34 and the other end connected to the refrigerant line 11 connected to the heat exchanger 14.

[0117] A separate on-off valve (not shown) can be provided in the separate connection line (not shown).

[0118] That is, in the cooling mode of the vehicle, the connection line (not shown) is opened by the on-off valve, and in this case, the refrigerant passing through the condenser 13 can be directly supplied to the heat exchanger 14 without passing through the gas injection portion 30.

[0119] Accordingly, in the cooling mode of the vehicle, the cooling performance can be improved by reducing the pressure of the refrigerant circulating along the refrigerant line 11.

[0120] In the present embodiment, the first refrigeration machine 40 is connected to the coolant circulating device 3 through the coolant line 5, and the coolant can be selectively circulated in the first refrigeration machine 40.

[0121] The first refrigeration machine 40 is connected to the refrigerant line 11 through the first refrigerant connection line 21. That is, the first refrigeration machine 40 can be a water-cooled heat exchanger into which the coolant flows.

[0122] Accordingly, the first refrigeration machine 40 exchanges heat between the coolant selectively flowing through the coolant line 5 and the refrigerant selectively supplied from the air conditioning device 10 to control the temperature of the coolant.

[0123] The second refrigeration machine 50 is connected to the coolant circulating device 3 through the coolant line 5, and the coolant can be selectively circulated in the second refrigeration machine 50.

[0124] The second refrigeration machine 50 is connected to the second refrigerant connection line 22 to supply the refrigerant from the air conditioning device 10. That is, the second refrigeration machine 50 can increase the temperature of the refrigerant by exchanging heat between the coolant and the refrigerant to recover waste heat from the coolant selectively flowing into the inside of the second refrigeration machine 50.

[0125] That is, the second refrigeration machine 50 can increase the temperature of the refrigerant by absorbing waste heat generated from the electrical components. Here, the second refrigeration machine 50 can be a water-cooled heat exchanger into which the coolant flows.

[0126] In the present embodiment, the first expansion valve 15, the second expansion valve 23, the third expansion valve 34, and the fourth expansion valve 35 can be electronic expansion valves that selectively expand the refrigerant while controlling the flow of the refrigerant passing through the refrigerant line 11 or the first refrigerant connection line 21.

[0127] Meanwhile, a description will be made of the gas injection portion 130 according to another embodiment of the present disclosure with reference to Figure 2

[0128] Figure 2 A block diagram of a gas injection portion applied to a heat pump system for a vehicle according to another embodiment of the present disclosure is shown.

[0129] Referring to Figure 2 , the gas injection portion 130 according to another embodiment of the present disclosure is provided in the air conditioning device 10.

[0130] ​Here, the gas injection portion 130 can include a plate-shaped heat exchanger 131, a supply line 132, a third expansion valve 133, and a fourth expansion valve 134.

[0131] First, the plate-shaped heat exchanger 131 can be provided in the refrigerant line 11 between the condenser 13 and the heat exchanger 14.

[0132] One end of the supply line 132 is connected to the refrigerant line 11 between the condenser 13 and the plate-shaped heat exchanger 131.

[0133] The other end of the supply line 132 can be connected to the compressor 19 through the plate-shaped heat exchanger 131.

[0134] That is, a portion of the refrigerant passing through the condenser 13 can flow into the supply line 132, and the remaining refrigerant can flow into the plate-shaped heat exchanger 131 through the refrigerant line 11.

[0135] The third expansion valve 133 can be provided in the supply line 132 at a front end of the plate-shaped heat exchanger 131.

[0136] The third expansion valve 133 can selectively open and close the supply line 132 while expanding the refrigerant flowing into the supply line 132, according to whether the gas injection portion 130 is operated.

[0137] In addition, the fourth expansion valve 134 can be provided in the refrigerant line 11 between the plate-shaped heat exchanger 131 and the heat exchanger 14.

[0138] Here, in the heating or dehumidification mode of the vehicle, the third expansion valve 133 can expand and supply the refrigerant flowing into the supply line 132 through the condenser 13 to the plate-shaped heat exchanger 131.

[0139] The plate-shaped heat exchanger 131 can exchange heat between the refrigerant flowing into the supply line 132 and expanded by the operation of the third expansion valve 133 and the refrigerant discharged from the condenser 13.

[0140] Then, the supply line 132 can selectively supply the gaseous refrigerant among the refrigerant that is exchanged in heat by the plate-shaped heat exchanger 131 to the compressor 19.

[0141] The operation of the gas injection portion 130 configured as described above is as follows.

[0142] First, according to the operation of the third expansion valve 133, a portion of the refrigerant passing through the condenser 13 flows into the supply line 132.

[0143] The refrigerant flowing into the supply line 132 expands by the operation of the third expansion valve 133, and the expanded refrigerant exchanges heat with the remaining refrigerant flowing from the condenser 13 through the refrigerant line 11 in the plate heat exchanger 131 and becomes gaseous.

[0144] Gaseous refrigerant is supplied to compressor 19 through open supply line 132.

[0145] That is, the gas injection section 130 causes the gaseous refrigerant that has been heat-exchanged while passing through the plate heat exchanger 131 to flow back to the compressor 19 through the supply line 132, thereby increasing the flow rate of the refrigerant circulating in the refrigerant line 11.

[0146] On the other hand, in vehicle heating mode, the fourth expansion valve 134 can cause the refrigerant passing through the plate heat exchanger 131 to expand and flow into the refrigerant line 11, regardless of whether the gas injection section 30 is operated.

[0147] In addition, when the gas injection unit 130 is operating in the vehicle's dehumidification mode, the fourth expansion valve 134 can selectively allow the refrigerant passing through the plate heat exchanger 131 to expand or pass through, depending on whether the first expansion valve 15 expands the refrigerant.

[0148] Conversely, when the gas injection unit 130 is not operating in the vehicle's dehumidification mode, the fourth expansion valve 35 allows the refrigerant passing through the gas-liquid separator 31 to pass through and be supplied to the heat exchanger 14.

[0149] Additionally, in the vehicle's cooling mode, the fourth expansion valve 134 prevents the refrigerant supplied from the condenser 13 from expanding and allows it to flow into the refrigerant line 11.

[0150] In the following text, reference will be made to Figures 3 to 5 The operation and function of a heat pump system for a vehicle constructed according to embodiments of the present disclosure, as described above, are described in detail.

[0151] First, refer to Figure 3 Describes the operation of cooling the battery module (not shown) in vehicle cooling mode.

[0152] Figure 3 This diagram illustrates the operational state of a heat pump system for a vehicle, in vehicle cooling mode, by utilizing a refrigerant to cool the battery module, according to an embodiment of the present disclosure.

[0153] Reference Figure 3 The coolant circulation device 3 supplies coolant to the condenser 13 and the first refrigerator 40 through the coolant pipeline 5 connected to the condenser 13 and the first refrigerator 40.

[0154] In the air conditioning device 10, each constituent element operates to cool the interior of the vehicle. Accordingly, the refrigerant circulates along the refrigerant line 11.

[0155] Here, the refrigerant line 11 connecting the heat exchanger 14 and the evaporator 16 is opened by the operation of the first expansion valve 15. The first refrigerant connection line 21 is opened by the operation of the second expansion valve 23 and the refrigerant valve 24.

[0156] In addition, the second refrigerant connection line 22 is closed by the operation of the refrigerant valve 24.

[0157] Then, the refrigerant having passed through the heat exchanger 14 can circulate along the refrigerant line 11 and the first refrigerant connection line 21.

[0158] Here, the first expansion valve 15 and the second expansion valve 23 can expand the refrigerant such that the expanded refrigerant can be supplied to the evaporator 16 and the first refrigeration machine 40, respectively.

[0159] In addition, the heat exchanger 14 can further condense the refrigerant introduced from the condenser 13 by heat exchange with the outside air.

[0160] Meanwhile, the coolant passing through the first refrigeration machine 40 can cool the battery module connected to the coolant circulation device 3.

[0161] That is, the coolant passing through the first refrigeration machine 40 is cooled by heat exchange with the refrigerant supplied to the first refrigeration machine 40. The coolant cooled by the first refrigeration machine 40 is supplied to the battery module. Accordingly, the battery module can be effectively cooled by the cooled coolant.

[0162] That is, the second expansion valve 23 expands a portion of the refrigerant passing through the heat exchanger 14 such that the expanded refrigerant is supplied to the first refrigeration machine 40. Meanwhile, the refrigerant valve 24 can open the first refrigerant connection line 21 and close the second refrigerant connection line 22.

[0163] Accordingly, a portion of the refrigerant discharged from the heat exchanger 14 is expanded by the operation of the second expansion valve 23 and enters a low-temperature and low-pressure state, and flows into the first refrigeration machine 40 connected to the first refrigerant connection line 21.

[0164] Then, the refrigerant flowing into the first refrigeration machine 40 is heat-exchanged with the coolant, passes through the reservoir 17 through the refrigerant line 11 connected to the first refrigerant connection line 21, and then flows into the compressor 19.

[0165] Meanwhile, the remaining refrigerant discharged from the heat exchanger 14 flows into the refrigerant line 11 and sequentially passes through the first expansion valve 15, the evaporator 16, the accumulator 17, the compressor 19, and the condenser 13 to cool the interior of the vehicle.

[0166] Here, the outside air flowing into the HVAC module 12 is cooled by the low-temperature refrigerant flowing into the evaporator 16 while passing through the evaporator 16.

[0167] In this case, the switch door 12b closes the portion passing through the heater 12a, so that the cooled outside air does not pass through the heater 12a. Therefore, the cooled outside air directly flows into the interior of the vehicle, thereby cooling the interior of the vehicle.

[0168] Meanwhile, the refrigerant, the amount of condensation of which is increased while sequentially passing through the condenser 13 and the heat exchanger 14, is expanded and supplied to the evaporator 16 so that the refrigerant can be evaporated at a lower temperature.

[0169] That is, in the present embodiment, the condenser 13 condenses the refrigerant, and the heat exchanger 14 additionally condenses the refrigerant, thereby facilitating the performance of subcooling of the refrigerant.

[0170] In addition, since the refrigerant, for which subcooling is performed, is evaporated at a lower temperature in the evaporator 16, it is possible to further reduce the temperature of the outside air passing through the evaporator 16, thereby improving the cooling performance and efficiency.

[0171] Meanwhile, the operation of the gas injection portion 30 is stopped. At this time, the refrigerant discharged from the condenser 13 can be supplied to the heat exchanger 14 without being expanded in the third and fourth expansion valves 34 and 35.

[0172] While the above-described processes are repeated, the refrigerant can cool the interior in the cooling mode of the vehicle, and at the same time, the refrigerant can cool the coolant by heat exchange while passing through the first refrigerating machine 40.

[0173] The low-temperature coolant cooled by the first refrigerating machine 40 flows into the battery module. Therefore, the battery module can be effectively cooled by the low-temperature coolant supplied thereto.

[0174] In the present embodiment, the operation of recovering heat from an external heat source and waste heat of an electrical component in the heating mode of the vehicle will be described with reference to Figure 4

[0175] Figure 4 An operational state diagram of recovering heat from an external heat source and waste heat of an electrical component according to the heating mode in a heat pump system for a vehicle according to an embodiment of the disclosure is shown.

[0176] Referring to Figure 4 ​In the vehicle heating mode, the heat pump system can absorb heat from an external heat source from the outside air and absorb waste heat of the electrical components 15.

[0177] First, the coolant circulating device 3 supplies coolant to the heater 12a, the condenser 13, and the second refrigerant machine 50 through the coolant line 5 connected to the heater 12a, the condenser 13, and the second refrigerant machine 50.

[0178] Here, the coolant, which is raised in temperature by absorbing waste heat from the electrical components, can be supplied to the second refrigerant machine 50. That is, the waste heat generated from the electrical components raises the temperature of the coolant supplied to the second refrigerant machine 50.

[0179] Meanwhile, the coolant, which is raised in temperature while passing through the second refrigerant machine 50 and the condenser 13 from the coolant circulating device 3, can be supplied to the heater 12a.

[0180] In the air conditioning device 10, each of the constituent elements operates to heat the interior of the vehicle. Accordingly, the refrigerant circulates along the refrigerant line 11.

[0181] Here, the refrigerant line 11 connecting the condenser 13 and the evaporator 16 is closed by the operation of the first expansion valve 15.

[0182] A portion of the first refrigerant connection line 21 is opened by the operation of the second expansion valve 23.

[0183] Here, a portion of the first refrigerant connection line 21 connected to the first refrigerant machine 40 is closed by the operation of the refrigerant valve 24. Meanwhile, the second refrigerant connection line 22 is opened by the operation of the refrigerant valve 24.

[0184] The second expansion valve 23 can selectively expand the refrigerant and supply it to the second refrigerant machine 50.

[0185] That is, when the gas injection portion 30 operates, the second expansion valve 23 can pass the refrigerant through the second refrigerant connection line 22. In contrast, when the gas injection portion 30 does not operate, the second expansion valve 23 can expand the refrigerant and flow into the second refrigerant connection line 22.

[0186] Meanwhile, the fourth expansion valve 35 can expand the refrigerant passing through the gas-liquid separator 31 and supply it to the heat exchanger 14.

[0187] Accordingly, the heat exchanger 14 recovers heat from an external heat source while evaporating the expanded refrigerant by heat exchange between the expanded refrigerant and the outside air.

[0188] Further, the coolant, which is raised in temperature by absorbing the waste heat of the electric components, is recovered when passing through the second refrigerating machine 50 and raises the temperature of the refrigerant supplied to the second refrigerating machine 50.

[0189] That is, the second refrigerating machine 50 receives the refrigerant, which is supplied from the heat exchanger 14 and expanded by the second expansion valve 23, through the second refrigerant connection line 22, and evaporates the supplied refrigerant by heat exchanging with the coolant, which is raised in temperature when passing through the electric components, thereby recovering the waste heat of the electric components.

[0190] Then, the refrigerant, which has passed through the second refrigerating machine 50, is supplied to the reservoir 17.

[0191] The refrigerant, which is supplied to the reservoir 17, is separated into gas and liquid. The gaseous refrigerant, which is separated into gas and liquid, is supplied to the compressor 19.

[0192] The refrigerant, which is compressed into a high-temperature and high-pressure state in the compressor 19, flows into the condenser 13.

[0193] Here, the refrigerant, which is supplied to the condenser 13, is heat-exchanged with the coolant, which is supplied through the coolant line 5, so that the temperature of the coolant can be raised. The coolant, which is raised in temperature, is supplied to the heater 12a.

[0194] At the same time, the switch door 12b is opened, so that the outside air, which flows into the HVAC module 12 and passes through the evaporator 16, passes through the heater 12a.

[0195] Therefore, the outside air, which flows in from the outside, flows in at a room temperature state, which is not cooled, when passing through the evaporator 16, to which the refrigerant is not supplied. The flowing outside air is converted into a high-temperature state while passing through the heater 12a and flows into the vehicle room, so that the vehicle room can be heated.

[0196] Here, when the gas injection portion 30 is operated, the supply line 32 is opened by the operation of the control valve 33.

[0197] In this state, the third expansion valve 34 expands the refrigerant, which is supplied from the condenser 13, and supplies it to the gas-liquid separator 31.

[0198] Among the refrigerant, which is supplied to the gas-liquid separator 31, the gaseous refrigerant is supplied to the compressor 19 through the opened supply line 32.

[0199] That is, the gas injection portion 30 makes the gaseous refrigerant, which is heat-exchanged while passing through the gas-liquid separator 31, flow into the compressor 19 again through the supply line 32, thereby increasing the flow rate of the refrigerant, which circulates in the refrigerant line 11.

[0200] In addition, the liquid refrigerant discharged from the gas-liquid separator 31 through the refrigerant line 11 flows into the heat exchanger 14 along the refrigerant line 11 opened by the operation of the fourth expansion valve 35.

[0201] In this case, the fourth expansion valve 35 can expand the refrigerant supplied from the gas-liquid separator 31.

[0202] That is, the gas-liquid separator 31 of the gas injection section 30 can divert gaseous refrigerant to the compressor 19 through the supply line 32 and supply liquid refrigerant to the fourth expansion valve 35.

[0203] Then, the refrigerant can be expanded while passing through the fourth expansion valve 35 and evaporate by exchanging heat with the outside air in the heat exchanger 14.

[0204] In addition, the refrigerant can be efficiently recovered from the waste heat in the second refrigeration unit 50 from the coolant whose temperature rises when passing through the electrical components, thereby improving heating performance and efficiency.

[0205] That is, when heating is required in the initial start-up idle state or initial running state of the vehicle, the heat pump system according to this embodiment absorbs external heat sources in the heat exchanger 14 and uses the waste heat of electrical components to raise the temperature of the refrigerant, thereby reducing the power consumption of the compressor 19 and improving the heating efficiency.

[0206] In addition, this disclosure can improve heating efficiency and performance while minimizing the amount of individual electric heaters used.

[0207] Furthermore, the gas injection unit 30 can maximize heating performance by increasing the flow rate of refrigerant circulating in the refrigerant line 11.

[0208] In this embodiment, reference will be made to Figure 5 Describe the operation of the vehicle's dehumidification mode.

[0209] Figure 5 This diagram illustrates the operational status of a dehumidification mode in a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0210] Reference Figure 5 The heat pump system can perform dehumidification mode while heating the vehicle interior.

[0211] First, the coolant circulation device 3 supplies coolant to the heater 12a and the condenser 13 through the coolant pipeline 5 connected to the heater 12a and the condenser 13.

[0212] Here, the coolant whose temperature rises as it passes from the coolant circulation device 3 through the condenser 13 can be supplied to the heater 12a.

[0213] Meanwhile, in the air conditioning device 10, each of the constituent elements operates to heat and dehumidify the interior of the vehicle. Accordingly, the refrigerant circulates along the refrigerant line 11.

[0214] The refrigerant line 11 connecting the heat exchanger 14 and the evaporator 16 is opened by the first expansion valve 15.

[0215] The first refrigerant connection line 21 is closed by the second expansion valve 23. Meanwhile, in a state in which the second refrigerant connection line 22 is also closed, the refrigerant can circulate along the refrigerant line 11.

[0216] Here, the first expansion valve 15 can expand the refrigerant supplied to the refrigerant line 11, so that the expanded refrigerant can be supplied to the evaporator 16.

[0217] The expanded refrigerant supplied to the evaporator 16 by the operation of the first expansion valve 15 exchanges heat with the outside air passing through the evaporator 16, and is then supplied to the reservoir 17 along the refrigerant line 11.

[0218] The refrigerant supplied to the reservoir 17 is separated into gas and liquid. The gaseous refrigerant among the refrigerant separated into gas and liquid is supplied to the compressor 19.

[0219] The refrigerant compressed into a high-temperature and high-pressure state in the compressor 19 flows into the condenser 13.

[0220] Here, the refrigerant supplied to the condenser 13 exchanges heat with the coolant supplied through the coolant line 5, so that the temperature of the coolant can be increased. The coolant whose temperature has been increased is supplied to the heater 12a.

[0221] Here, the switch door 12b is opened, so that the outside air flowing into the HVAC module 12 and passing through the evaporator 16 passes through the heater 12a.

[0222] That is, the outside air flowing into the HVAC module 12 is dehumidified by the low-temperature refrigerant flowing into the evaporator 16 while passing through the evaporator 16. Then, while passing through the heater 12a, it is converted into a high-temperature state and flows into the interior of the vehicle, so that the interior of the vehicle is heated and dehumidified.

[0223] Meanwhile, the gas injection portion 30 can be selectively operated in a dehumidification mode of the vehicle.

[0224] First, when the gas injection portion 30 is not operated, the third expansion valve 34 and the fourth expansion valve 35 do not expand the refrigerant supplied from the condenser 13, and supply it to the heat exchanger 14.

[0225] Accordingly, the heat exchanger 14 can condense the refrigerant by exchanging heat with the outside air.

[0226] In contrast, when the gas injection portion 30 is operated, the supply line 32 is opened by the operation of the control valve 33.

[0227] In this state, the third expansion valve 34 expands the refrigerant supplied from the condenser 13 and supplies it to the gas-liquid separator 31.

[0228] Among the refrigerant supplied to the gas-liquid separator 31, the gaseous refrigerant is supplied to the compressor 19 through the opened supply line 32.

[0229] That is, the gas injection portion 30 causes the gaseous refrigerant, which exchanges heat while passing through the gas-liquid separator 31, to flow into the compressor 19 again through the supply line 32, thereby increasing the flow rate of the refrigerant circulating in the refrigerant line 11.

[0230] In addition, the liquid refrigerant discharged from the gas-liquid separator 31 along the refrigerant line 11 flows into the heat exchanger 14 along the refrigerant line 11 opened by the operation of the fourth expansion valve 35.

[0231] In addition, the fourth expansion valve 35 can selectively expand or pass the refrigerant passing through the gas-liquid separator 31 depending on whether the refrigerant of the first expansion valve 15 is expanded.

[0232] Accordingly, the heat exchanger 14 can condense or evaporate the refrigerant by heat exchange of the refrigerant with the outside air.

[0233] That is, the gas injection portion 30 of the gas-liquid separator 31 can split the gaseous refrigerant to the compressor 19 through the supply line 32 and supply the liquid refrigerant to the fourth expansion valve 35.

[0234] Then, the refrigerant can be selectively expanded when passing through the fourth expansion valve 35 and condensed or evaporated by heat exchange with the outside air in the heat exchanger 14.

[0235] Accordingly, as described above, when the heat pump system for a vehicle according to the embodiment of the disclosure is applied, the temperature of the battery module can be controlled according to the vehicle mode by using one first refrigerating machine 40 that utilizes heat exchange of the refrigerant and the coolant, thereby achieving simplification of the system.

[0236] In addition, the heat pump system for a vehicle according to the embodiment of the disclosure can improve heating efficiency by using the second refrigerating machine 50 as another refrigerating machine that recovers waste heat from the electrical components in the heating mode of the vehicle and selectively utilizing the waste heat of the external heat source or the electrical components.

[0237] In addition, according to the embodiment of the disclosure, by effectively controlling the temperature of the battery module, the optimal performance of the battery module can be exhibited, and the total mileage of the vehicle can be increased by effectively managing the battery module.

[0238] In addition, according to embodiments of the present disclosure, the flow rate of the refrigerant can be selectively increased in a vehicle heating or dehumidification mode by applying the gas injection portion 30 to maximize the heating performance.

[0239] Furthermore, the present disclosure can reduce manufacturing costs and weight and improve space utilization by simplifying the entire system.

[0240] While the present disclosure has been described in connection with what is presently considered to be the practical embodiments, it is to be understood that the present disclosure is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A heat pump system for a vehicle, comprising: an air conditioning device circulating refrigerant through a refrigerant line; a coolant circulating device circulating coolant through a coolant line; a first refrigeration machine connected to the coolant circulating device through the coolant line, connected to the refrigerant line through a first refrigerant connection line, and exchanging heat between selectively flowed-in coolant and refrigerant supplied from the air conditioning device to control the temperature of the coolant; and a second refrigeration machine connected to the coolant circulating device through the coolant line, connected to a second refrigerant connection line so that refrigerant is supplied from the air conditioning device, and raising the temperature of the refrigerant by exchanging heat between the coolant and the refrigerant to recover waste heat from the coolant selectively flowed into the second refrigeration machine, wherein the air conditioning device includes a gas injection portion that bypasses a portion of the refrigerant passing through a condenser to a compressor to increase the flow rate of the refrigerant circulating in the refrigerant line, the air conditioning device comprising: an HVAC module including an evaporator connected to the HVAC module through the refrigerant line, and a switch door that selectively flows outside air passing through the evaporator to a heater according to a cooling mode, a heating mode, and a dehumidification mode of the vehicle; a condenser connected to the coolant circulating device through the coolant line so that the coolant passes through, and exchanges heat between the refrigerant supplied through the refrigerant line and the coolant; a compressor connected between the evaporator and the condenser through the refrigerant line; a heat exchanger provided in the refrigerant line between the condenser and the evaporator; a first expansion valve provided in the refrigerant line connecting the heat exchanger and the evaporator; a second expansion valve provided in the first refrigerant connection line; and a reservoir provided in the refrigerant line between the evaporator and the compressor, one end of the second refrigerant connection line is connected to the first refrigerant connection line through a refrigerant valve between the second expansion valve and the first refrigeration machine so that refrigerant passing through the heat exchanger passes through the second refrigeration machine, wherein, when recovering heat from an external heat source and waste heat of electrical components in the heating mode of the vehicle, the coolant circulating device supplies coolant to the heater, the condenser, and the second refrigeration machine through the coolant line connected to the heater, the condenser, and the second refrigeration machine, the coolant, which is raised in temperature while passing through the second refrigeration machine and the condenser from the coolant circulating device, is supplied to the heater, in the air conditioning device, the refrigerant line connecting the heat exchanger and the evaporator is closed through the first expansion valve, the portion of the first refrigerant connection line connected to the first refrigeration machine is closed through a refrigerant valve, and the second refrigeration machine connection line is opened through the refrigerant valve, the second expansion valve selectively expands refrigerant and supplies the refrigerant to the second refrigeration machine, ​ The heat exchanger evaporates the refrigerant by heat exchange with outside air, The gas injection portion is selectively operated.

2. The heat pump system for a vehicle according to claim 1, wherein one end of the first refrigerant connection line is connected to the refrigerant line between the heat exchanger and the first expansion valve, the other end of the first refrigerant connection line is connected to the refrigerant line between the accumulator and the evaporator, and the other end of the second refrigerant connection line is connected to the accumulator.

3. The heat pump system for a vehicle according to claim 1, wherein the second expansion valve selectively expands the refrigerant passing through the heat exchanger according to the mode of the vehicle to flow the refrigerant into the first refrigerant connection line or to pass the refrigerant through the first refrigerant connection line.

4. The heat pump system for a vehicle according to claim 2, wherein the gas injection portion includes: a gas-liquid separator provided in the refrigerant line between the condenser and the heat exchanger, the gas-liquid separator separating and selectively discharging gaseous refrigerant and liquid refrigerant in the refrigerant passing through the condenser; a supply line connecting the gas-liquid separator and the compressor, the supply line selectively supplying the gaseous refrigerant from the gas-liquid separator to the compressor; a control valve provided in the supply line; a third expansion valve provided in the refrigerant line between the condenser and the gas-liquid separator; and a fourth expansion valve provided in the refrigerant line between the gas-liquid separator and the heat exchanger.

5. The heat pump system for a vehicle according to claim 4, wherein when the gas injection portion is operated in a heating mode of the vehicle, the third expansion valve expands the refrigerant supplied from the condenser and supplies the refrigerant to the gas-liquid separator, the fourth expansion valve expands the refrigerant supplied from the gas-liquid separator and flows the refrigerant into the refrigerant line.

6. The heat pump system for a vehicle according to claim 4, wherein when the gas injection portion is not operated in the heating mode of the vehicle, the third expansion valve passes the refrigerant supplied from the condenser, the fourth expansion valve expands the refrigerant passing through the gas-liquid separator and supplies the refrigerant to the heat exchanger.

7. The heat pump system for a vehicle according to claim 4, wherein when the gas injection portion is not operated in a dehumidifying mode of the vehicle, the third expansion valve passes the refrigerant supplied from the condenser, the fourth expansion valve passes the refrigerant passing through the gas-liquid separator and supplies the refrigerant to the heat exchanger.

8. The heat pump system for a vehicle according to claim 4, wherein when the gas injection portion is operated in the dehumidifying mode of the vehicle, the third expansion valve expands the refrigerant supplied from the condenser and supplies the refrigerant to the gas-liquid separator, the fourth expansion valve expands the refrigerant supplied from the gas-liquid separator and flows the refrigerant into the refrigerant line. The fourth expansion valve selectively expands or passes the refrigerant passing through the gas-liquid separator according to whether the refrigerant in the first expansion valve is expanded.

9. The heat pump system for a vehicle according to claim 4, wherein, in a cooling mode of the vehicle, the third expansion valve and the fourth expansion valve do not expand the refrigerant supplied from the condenser, and flow the refrigerant through the refrigerant line.

10. The heat pump system for a vehicle according to claim 4, wherein, the control valve is operated so that the supply line is opened when the gas injection portion is operated.

11. The heat pump system for a vehicle according to claim 4, wherein, the first expansion valve, the second expansion valve, the third expansion valve, and the fourth expansion valve are electronic expansion valves that selectively expand the refrigerant while controlling the flow of the refrigerant.

12. The heat pump system for a vehicle according to claim 4, wherein, the heat exchanger condenses or evaporates the refrigerant by heat exchange with outside air of the refrigerant condensed in the condenser according to the selective operation of the fourth expansion valve.

13. The heat pump system for a vehicle according to claim 4, wherein, when cooling a battery module in a cooling mode of the vehicle, the coolant circulating device supplies the coolant to the condenser and the first refrigerant machine through the coolant line connected to the condenser and the first refrigerant machine, in the air conditioning device, in a state in which the first refrigerant connection line is opened and the second refrigerant connection line is closed by operation of the second expansion valve and the refrigerant valve, the refrigerant circulates along the refrigerant line and the first refrigerant connection line, the first expansion valve and the second expansion valve expand the coolant so that the expanded refrigerant is supplied to the evaporator and the first refrigerant machine, respectively, the heat exchanger condenses the refrigerant by heat exchange with outside air.

14. The heat pump system for a vehicle according to claim 4, wherein, in a dehumidifying mode of the vehicle, the coolant circulating device supplies the coolant to the heater and the condenser through the coolant line connected to the heater and the condenser, the coolant, which has increased in temperature while passing through the condenser from the coolant circulating device, is supplied to the heater, in the air conditioning device, in a state in which the first refrigerant connection line is closed and the second refrigerant machine connection line is closed by operation of the second expansion valve, the refrigerant circulates along the refrigerant line, the first expansion valve expands the refrigerant so that the expanded refrigerant is supplied to the evaporator, the gas injection portion is selectively operated.

15. The heat pump system for a vehicle according to claim 14, wherein, the heat exchanger selectively condenses or evaporates the refrigerant passing through the condenser according to whether the gas injection portion is operated.

16. The heat pump system for a vehicle according to claim 1, wherein, the gas injection portion includes: a plate-shaped heat exchanger provided in the refrigerant line between the condenser and the heat exchanger; a supply line including one end connected to the refrigerant line between the condenser and the plate-shaped heat exchanger and the other end connected to the compressor through the plate-shaped heat exchanger; a third expansion valve provided in the supply line at a front end of the plate-shaped heat exchanger; and a fourth expansion valve provided in the refrigerant line between the plate-shaped heat exchanger and the heat exchanger.

17. The heat pump system for a vehicle according to claim 1, wherein the condenser is a water-cooled heat exchanger, the heat exchanger is an air-cooled heat exchanger.

18. The heat pump system for a vehicle according to claim 1, wherein the gas injection portion is selectively operated in a heating or dehumidifying mode of the vehicle.

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