Heat pump system for vehicle

Abstract

A heat pump system for a vehicle includes: a compressor configured to compress a refrigerant; a heating, ventilation and air conditioning (HVAC) module including an internal condenser and an evaporator; a heat exchanger connected to the compressor via a refrigerant line; a first expansion valve provided on the refrigerant line between the heat exchanger and the evaporator; and a gas injection device connected to the internal condenser or the heat exchanger and configured to selectively expand and flow the refrigerant supplied from the internal condenser or the refrigerant supplied from the heat exchanger to selectively supply a portion of the supplied refrigerant to the compressor, the flow rate of the refrigerant circulating in the refrigerant pipeline is increased; a first valve provided on the refrigerant line between the compressor and the heat exchanger; a first connection line; and a second connection line in which the flow of the refrigerant is controlled according to at least one mode for temperature regulation of the interior of the vehicle.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefits of Korean Patent Application No. 10-2023-0154759 filed in the Korean Intellectual Property Office on November 9, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to a heat pump system for a vehicle, and more particularly to a heat pump system for a vehicle capable of improving cooling and heating performance inside the vehicle. Background Art

[0004] Generally, an air conditioning system for a vehicle includes an air conditioning unit that circulates a refrigerant to heat or cool the interior of the vehicle.

[0005] The air conditioning unit is used to maintain the interior of a vehicle at a suitable temperature regardless of changes in the external temperature. The air conditioning unit is configured to heat or cool the interior of the vehicle by exchanging heat using the condenser and the evaporator in a process in which the refrigerant discharged from the compressor passes through the condenser, the receiver-drier, the expansion valve, and the evaporator and then circulates back to the compressor.

[0006] In other words, the air conditioning unit condenses the high-temperature and high-pressure gas-phase refrigerant compressed from the compressor through the condenser, passes the refrigerant through the receiver-drier and the expansion valve, and then evaporates the refrigerant in the evaporator in the cooling mode to reduce the temperature and humidity inside the vehicle.

[0007] In other words, with the continued concern about energy efficiency and environmental pollution, it is expected to develop an environmentally friendly vehicle that can basically replace internal combustion engine vehicles. Environmentally friendly vehicles are divided into electric vehicles driven by using fuel cells or electricity as a power source and hybrid vehicles driven by using an engine and a battery.

[0008] In the electric vehicle or hybrid vehicle among these environmentally friendly vehicles, a separate heater is not used like the air conditioner of a general vehicle. In addition, the air conditioner used in the environmentally friendly vehicle is generally called a heat pump system.

[0009] Electric vehicles driven by power from fuel cells generate driving force by converting the energy of a chemical reaction between oxygen and hydrogen into electrical energy. In this process, heat energy is generated by the chemical reaction in the fuel cell. Therefore, it is desirable to ensure the performance of the fuel cell by effectively removing the generated heat.

[0010] In addition, hybrid vehicles generate driving force by driving a motor using electricity supplied from the above-mentioned fuel cell or battery and an engine running on ordinary fuel. Therefore, the heat generated from the fuel cell or battery and the motor should be effectively removed to ensure the performance of the motor.

[0011] Therefore, in a hybrid vehicle or an electric vehicle according to the related art, a cooling device, a heat pump system, and a battery cooling system should be respectively configured as separate closed loops to prevent the motor, electrical components, and batteries including a fuel cell from heating up.

[0012] Therefore, the size and weight of the cooling module provided at the front of the vehicle increase, and the layout of connection pipes that supply refrigerant and coolant to each of the heat pump system, the cooling device, and the battery cooling system in the engine compartment becomes complicated.

[0013] In addition, since a battery cooling system for heating or cooling the battery according to the vehicle state is separately provided to obtain the best performance of the battery, a plurality of valves for selectively interconnecting the connection pipes are employed. Therefore, noise and vibration generated by frequent switching operations of the valves may be introduced into the vehicle interior, thereby reducing riding comfort.

[0014] Furthermore, when heating the interior of the vehicle, heating performance may be deteriorated due to lack of a heat source, and power consumption may increase due to use of an electric heater, and power consumption of a compressor may also increase.

[0015] The above information disclosed in the Background section is only for enhancing understanding of the background of the invention. Therefore, the Background section may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0016] The present invention provides a heat pump system for a vehicle, which can improve cooling and heating performance by increasing the flow rate of refrigerant using an injection device, wherein the injection device is configured to selectively operate in at least one mode selected for vehicle interior air conditioning.

[0017] A heat pump system for a vehicle, comprising: a compressor configured to compress a refrigerant; a heating, ventilation and air conditioning (HVAC) module including an internal condenser and an evaporator; a heat exchanger connected to the compressor via a refrigerant line; and a first expansion valve disposed on the refrigerant line between the heat exchanger and the evaporator. The heat pump system also includes: an injection device connected to the internal condenser or the heat exchanger and configured to selectively expand and flow the refrigerant supplied from the internal condenser or the refrigerant supplied from the heat exchanger, so as to selectively supply a portion of the supplied refrigerant to the compressor and increase the flow rate of the refrigerant circulating in the refrigerant line. The heat pump system also includes: a first valve disposed on the refrigerant line between the compressor and the heat exchanger; a first connecting line, a first end of which is connected to the first valve and a second end of which is connected to the internal condenser; and a second connecting line, a first end of which is connected to the internal condenser and a second end of which is connected to the injection device. The flow of the refrigerant is controlled according to at least one mode for temperature regulation inside the vehicle.

[0018] The heat pump system for a vehicle further includes: a second valve disposed on the refrigerant pipeline between the heat exchanger and the first expansion valve; a third connecting pipeline, a first end of which is connected to the second valve, and a second end of which is connected to the second connecting pipeline. The heat pump system further includes: a fourth connecting pipeline, a first end of which is connected to the second valve, and a second end of which is connected to the refrigerant pipeline between the compressor and the evaporator.

[0019] The gas injection device includes: a gas-liquid separator configured to separate gaseous refrigerant and liquid refrigerant in the supplied refrigerant and selectively discharge them; a second expansion valve connected to the second end of the second connecting pipeline; a first pipeline, whose first end is connected to the second connecting pipeline between the internal condenser and the second expansion valve, and whose second end is connected to the gas-liquid separator. The gas injection device also includes: a third expansion valve arranged on the first pipeline; a second pipeline, whose first end is connected to the second expansion valve, and whose second end is connected to the gas-liquid separator; and a supply pipeline, whose first end is connected to the gas-liquid separator, and whose second end is connected to the compressor.

[0020] When the third expansion valve expands and supplies refrigerant in a state of cooling or heating the interior of the vehicle, the gas-liquid separator operates and supplies gaseous refrigerant in the supplied refrigerant to the compressor via the supply line to increase the flow rate of the refrigerant circulating in the refrigerant line.

[0021] The gas injection device further includes a third pipeline, a first end of which is connected to the second expansion valve, and a second end of which is connected to the refrigerant pipeline between the first valve and the heat exchanger.

[0022] The heat pump system further includes: a fifth connecting pipeline, a first end of which is connected to the second pipeline between the gas-liquid separator and the second expansion valve, and a second end of which is connected to the refrigerant pipeline between the first expansion valve and the evaporator. The heat pump system further includes: and a fourth expansion valve, which is arranged on the fifth connecting pipeline.

[0023] At least one mode includes: a first mode for cooling the interior of the vehicle, wherein the gas-liquid separator operates; a second mode for heating the interior of the vehicle, wherein the gas-liquid separator operates; a third mode for heating and dehumidifying the interior of the vehicle, wherein the gas-liquid separator operates; a fourth mode for cooling the interior of the vehicle, wherein the gas-liquid separator does not operate; and a fifth mode for heating the interior of the vehicle, wherein the gas-liquid separator does not operate.

[0024] In the first mode: the first expansion valve stops operating; the first connecting pipeline is closed by the operation of the first valve; the portion of the second connecting pipeline connected to the internal condenser is closed; the portion of the second connecting pipeline connected to the second end of the third connecting pipeline and connected to the first pipeline is opened; the third connecting pipeline is opened by the operation of the second valve; the fourth connecting pipeline is closed by the operation of the second valve; the fifth connecting pipeline is opened by the operation of the fourth expansion valve; the refrigerant pipeline connecting the second valve and the first expansion valve is closed; the second expansion valve stops operating; the first pipeline is opened by the operation of the third expansion valve; the portion of the second pipeline connecting the gas-liquid separator and the first end of the fifth connecting pipeline is opened; the third pipeline is closed by the operation of the second expansion valve; the supply pipeline is opened; and the gas-liquid separator supplies the gaseous refrigerant in the supplied refrigerant to the compressor via the opened supply pipeline, and discharges the liquid refrigerant to the fifth connecting pipeline connected to the second pipeline.

[0025] The third expansion valve is configured to expand the refrigerant supplied from the heat exchanger via the third connecting line, a portion of the second connecting line, and the first line, and to supply the expanded refrigerant to the gas-liquid separator. The fourth expansion valve is configured to expand the refrigerant supplied from the gas-liquid separator via a portion of the second line and the fifth connecting line, and to supply the expanded refrigerant to the evaporator.

[0026] In the second mode: the first expansion valve stops operating; the refrigerant pipeline connecting the first valve and the second end of the third pipeline is closed by the operation of the first valve; the first connecting pipeline is opened by the operation of the first valve; the second connecting pipeline is opened; the third connecting pipeline is closed by the operation of the second valve; the fourth connecting pipeline is opened by the operation of the second valve; the fifth connecting pipeline is closed by the operation of the fourth expansion valve; the refrigerant pipeline connecting the second valve to the second end of the fourth connecting pipeline is closed; the first pipeline is opened by the operation of the third expansion valve; the second pipeline is opened by the operation of the second expansion valve; the second connecting pipeline is not connected to the second pipeline by the operation of the second expansion valve; the supply pipeline is opened; the third pipeline is opened by the operation of the second expansion valve; and the gas-liquid separator supplies the gaseous refrigerant in the supplied refrigerant to the compressor via the opened supply pipeline, and discharges the liquid refrigerant to the second expansion valve via the second pipeline.

[0027] The second expansion valve is configured to expand the refrigerant discharged from the gas-liquid separator via the second pipeline and discharge the expanded refrigerant to the third pipeline. The third expansion valve is configured to expand the refrigerant supplied from the internal condenser via the second connecting pipeline and the first pipeline and supply the expanded refrigerant to the gas-liquid separator; and the fourth expansion valve stops operating.

[0028] In the third mode: the first expansion valve stops operating; the refrigerant pipeline connecting the first valve and the second end of the third pipeline is closed by the operation of the first valve; the first connecting pipeline is opened by the operation of the first valve; the second connecting pipeline is opened; the third connecting pipeline is closed by the operation of the second valve; the fourth connecting pipeline is opened by the operation of the second valve; the fifth connecting pipeline is opened by the operation of the fourth expansion valve; the refrigerant pipeline connecting the second valve to the second end of the fifth connecting pipeline is closed; the first pipeline is opened by the operation of the third expansion valve; the second pipeline is opened by the operation of the second expansion valve; the second connecting pipeline is not connected to the second pipeline by the operation of the second expansion valve; the supply pipeline is opened; the third pipeline is opened by the operation of the second expansion valve; a part of the refrigerant discharged from the gas-liquid separator via the second pipeline flows via the fifth connecting pipeline; and the gas-liquid separator supplies the gaseous refrigerant in the supplied refrigerant to the compressor via the opened supply pipeline, and discharges the liquid refrigerant to the second pipeline.

[0029] The second expansion valve is configured to expand the remaining refrigerant in the refrigerant discharged from the gas-liquid separator via the second pipeline, and discharge the expanded refrigerant to the third pipeline. The third expansion valve is configured to expand the refrigerant supplied from the internal condenser via the second connecting pipeline and the first pipeline, and supply the expanded refrigerant to the gas-liquid separator. The fourth expansion valve is configured to expand the refrigerant supplied from the gas-liquid separator via the second pipeline and the fifth connecting pipeline, and supply the expanded refrigerant to the evaporator.

[0030] In the fourth mode: the refrigerant pipeline is opened by the operation of the first expansion valve, so that the compressor, the heat exchanger and the evaporator can be connected to each other via the refrigerant pipeline; the first connecting pipeline is closed by the operation of the first valve; the second connecting pipeline is closed; the third connecting pipeline and the fourth connecting pipeline are closed by the operation of the second valve; the fifth connecting pipeline is closed by the operation of the fourth expansion valve; the first pipeline is closed by the operation of the third expansion valve; the second pipeline is closed by the operation of the second expansion valve; the supply pipeline is closed; and the third pipeline is closed by the operation of the second expansion valve.

[0031] The first expansion valve is configured to expand the refrigerant supplied from the heat exchanger and supply the expanded refrigerant to the evaporator; and the second expansion valve, the third expansion valve, and the fourth expansion valve stop operating.

[0032] In the fifth mode: the first expansion valve stops operating; the refrigerant pipeline connecting the first valve and the second end of the third pipeline is closed by the operation of the first valve; the first connecting pipeline is opened by the operation of the first valve; the second connecting pipeline is opened; the third connecting pipeline is closed by the operation of the second valve; the fourth connecting pipeline is opened by the operation of the second valve; the fifth connecting pipeline is closed by the operation of the fourth expansion valve; the refrigerant pipeline connecting the second valve to the second end of the fourth connecting pipeline is closed; the first pipeline is closed by the operation of the third expansion valve; the second pipeline is closed by the operation of the second expansion valve; the supply pipeline is closed; the third pipeline is opened by the operation of the second expansion valve; and the second connecting pipeline is connected to the third pipeline by the operation of the second expansion valve.

[0033] The second expansion valve is configured to expand the refrigerant supplied from the interior condenser via the second connecting line and discharge the expanded refrigerant to the third line. The third expansion valve and the fourth expansion valve stop operating.

[0034] The heat exchanger is configured to condense the refrigerant supplied in the first mode and the fourth mode.

[0035] The heat exchanger is configured to evaporate the refrigerant supplied in the second mode, the third mode, and the fifth mode.

[0036] The first expansion valve, the third expansion valve, and the fourth expansion valve are bidirectional expansion valves that selectively operate in at least one mode, and are configured to selectively expand the supplied refrigerant while controlling the flow of the refrigerant.

[0037] As described above, according to the heat pump system for a vehicle of the embodiment, cooling and heating performances may be improved by adopting the air injection device configured to selectively operate in at least one mode selected for vehicle interior air conditioning.

[0038] Furthermore, according to the present invention, the performance of the system can be maximized by using the gas injection device while minimizing the required components. Therefore, the system can be streamlined and simplified.

[0039] Furthermore, according to the embodiments, manufacturing cost and weight may be reduced by simplifying the entire system, thereby improving space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and other objects, features and advantages of the present invention will become more apparent through the following detailed description in conjunction with the accompanying drawings, in which:

[0041] Figure 1 is a block diagram of a heat pump system for a vehicle according to an embodiment;

[0042] Figure 2 is an operation diagram of a first mode of a heat pump system for a vehicle according to an embodiment;

[0043] Figure 3 is an operation diagram of a second mode of a heat pump system for a vehicle according to an embodiment;

[0044] Figure 4 is an operation diagram of a third mode of a heat pump system for a vehicle according to an embodiment;

[0045] Figure 5 is an operation diagram of a fourth mode of the heat pump system for a vehicle according to the embodiment;

[0046] Figure 6 is an operation diagram of a fifth mode of the heat pump system for a vehicle according to the embodiment.

[0047] Description of Reference Numerals :

[0048] 10: Compressor

[0049] 11: Refrigerant pipeline

[0050] 12: HVAC module

[0051] 13: Internal condenser

[0052] 14: Heat exchanger

[0053] 15: First expansion valve

[0054] 17: Evaporator

[0055] 21: First connecting pipeline

[0056] 22: second connecting pipeline;

[0057] 23: Third connecting pipeline

[0058] 24: Fourth connecting pipeline

[0059] 25: Fifth connecting pipeline

[0060] 50: Gas injection device

[0061] 51: Gas-liquid separator

[0062] 52: Second expansion valve

[0063] 53: First Pipeline

[0064] 54: Second pipeline

[0065] 55: The third expansion valve

[0066] 56: Supply pipeline

[0067] 57: The Third Pipeline

[0068] 60: Fourth expansion valve

[0069] V1, V2: first valve and second valve. DETAILED DESCRIPTION

[0070] The embodiments are described in detail below with reference to the accompanying drawings.

[0071] The embodiments disclosed in this specification and the structures described in the drawings are only exemplary embodiments of the present invention and do not cover the entire scope of the present invention. Therefore, it should be understood that various equivalents and modifications may exist when applying this specification.

[0072] In order to clarify the present invention, parts irrelevant to the description are omitted. In addition, in the entire specification, the same elements or equivalents are represented by the same reference numerals.

[0073] In addition, the size and thickness of each element are arbitrarily shown in the drawings, but the present invention is not necessarily limited thereto. In addition, in the drawings, the thickness of layers, films, panels, regions, etc. may be exaggerated for clarity.

[0074] In addition, unless explicitly described to the contrary, the term “comprise” and terms such as “include” or “comprising”, will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0075] In addition, terms such as “unit,” “means,” “portion,” “section,” and “member” described in the specification refer to a unit of a comprehensive element that performs at least one function or operation.

[0076] When a component, device, element, etc. of the present invention is described as having a purpose or performing an operation, function, etc., the component, device or element should be considered herein as being "configured to" satisfy the purpose or perform the operation or function.

[0077] Figure 1 is a block diagram of a heat pump system for a vehicle according to an embodiment.

[0078] According to the heat pump system for a vehicle of the embodiment, cooling and heating performances may be improved by adopting the air injection device 50 configured to selectively operate in at least one mode selected for vehicle interior air conditioning.

[0079] See also Figure 1 The heat pump system may include: a compressor 10, a heating, ventilation and air conditioning (HVAC) module 12, an internal condenser 13, a heat exchanger 14, a first expansion valve 15, an evaporator 17, a first valve V1, a second valve V2, a first connecting pipeline 21, a second connecting pipeline 22, a third connecting pipeline 23, a fourth connecting pipeline 24 and a gas injection device 50.

[0080] First, the compressor 10 may compress supplied refrigerant.

[0081] An internal condenser 13 and an evaporator 17 connected to the compressor 10 via a refrigerant line 11 may be disposed within a heating, ventilation and air conditioning (HVAC) module 12 .

[0082] In the HVAC module 12 , the ambient air having passed through the evaporator 17 may flow into the interior condenser 13 according to a cooling mode, a heating mode, and a heating and dehumidification mode of the vehicle interior.

[0083] The heat exchanger 14 may be connected to the compressor 10 via a refrigerant line 11. The heat exchanger 14 may selectively condense or evaporate the refrigerant selectively supplied from the compressor 10 by exchanging heat with a working fluid such as ambient air or a coolant.

[0084] In other words, the heat exchanger 14 may be configured as an air-cooled or water-cooled heat exchanger.

[0085] The first expansion valve 15 may be disposed on the refrigerant line 11 between the heat exchanger 14 and the evaporator 17 .

[0086] In the present embodiment, the evaporator 17 may be connected to the first expansion valve 15 via the refrigerant line 11. When the expanded refrigerant is introduced, the evaporator 17 may evaporate the refrigerant by exchanging heat with air introduced into the HVAC module.

[0087] The first valve V1 may be disposed on the refrigerant line 11 between the compressor 10 and the heat exchanger 14 .

[0088] A first end of the first connecting line 21 may be connected to the first valve V1 . A second end of the first connecting line 21 may be connected to the interior condenser 13 .

[0089] A first end of the second connecting line 22 may be connected to the internal condenser 13. A second end of the second connecting line 22 may be connected to the gas injection device 50.

[0090] In the present embodiment, the second valve V2 may be disposed on the refrigerant line 11 between the heat exchanger 14 and the first expansion valve 15 .

[0091] A first end of the third connecting line 23 may be connected to the second valve V2 , and a second end of the third connecting line 23 may be connected to the second connecting line 22 .

[0092] A first end of the fourth connecting line 24 may be connected to the second valve V2 , and a second end of the fourth connecting line 24 may be connected to the refrigerant line 11 between the compressor 10 and the evaporator 17 .

[0093] Furthermore, the gas injection device 50 may be connected to the internal condenser 13 or the heat exchanger 14 .

[0094] The gas injection device 50 may selectively expand and flow the refrigerant supplied from the interior condenser 13 or the refrigerant supplied from the heat exchanger 14 .

[0095] Meanwhile, the gas injection device 50 may selectively supply a portion of the supplied refrigerant to the compressor 10 to increase the total flow rate of the refrigerant circulating in the refrigerant line 11 .

[0096] The gas injection device 50 may include a gas-liquid separator 51 , a second expansion valve 52 , a first pipeline 53 , a second pipeline 54 , a third expansion valve 55 , a supply pipeline 56 , and a third pipeline 57 .

[0097] First, the gas-liquid separator 51 may separate gaseous refrigerant and liquid refrigerant in the refrigerant introduced inside and selectively discharge them.

[0098] The second expansion valve 52 may be connected to the second end of the second connecting line 22 .

[0099] In the present embodiment, a first end of the first pipeline 53 may be connected to the second connection pipeline 22 between the interior condenser 13 and the second expansion valve 52. A second end of the first pipeline 53 may be connected to the gas-liquid separator 51.

[0100] A first end of the second pipeline 54 may be connected to the second expansion valve 52. A second end of the second pipeline 54 may be connected to the gas-liquid separator 51.

[0101] When cooling or heating the vehicle interior, the liquid refrigerant discharged from the gas-liquid separator 51 may flow to the second line 54 thus configured.

[0102] The third expansion valve 55 may be disposed on the first pipeline 53. The third expansion valve 55 may selectively expand the refrigerant introduced through the first pipeline 53 and supply the expanded refrigerant to the gas-liquid separator 51.

[0103] In other words, in a state of cooling or heating the vehicle interior, the gas-liquid separator 51 may operate with the third expansion valve 55 expanding the refrigerant and supplying the expanded refrigerant.

[0104] In this embodiment, a first end of the supply line 56 may be connected to the gas-liquid separator 51. A second end of the supply line 56 may be connected to the compressor 10.

[0105] The supply line 56 configured in this manner may selectively supply the gaseous refrigerant discharged from the gas-liquid separator 51 to the compressor 10 .

[0106] The gas-liquid separator 51 may supply gaseous refrigerant among the supplied refrigerant to the compressor 10 via the supply line 56 to increase the flow rate of the refrigerant circulating in the refrigerant line 11 .

[0107] In addition, a first end of the third line 57 may be connected to the second expansion valve 52. A second end of the third line 57 may be connected to the refrigerant line 11 between the first valve V1 and the heat exchanger 14.

[0108] The heat pump system may further include a fifth connecting line 25 and a fourth expansion valve 60 .

[0109] A first end of the fifth connection line 25 may be connected to the second line 54 between the gas-liquid separator 51 and the second expansion valve 52. A second end of the fifth connection line 25 may be connected to the refrigerant line 11 between the first expansion valve 15 and the evaporator 17.

[0110] In addition, a fourth expansion valve 60 may be provided on the fifth connecting line 25. The fourth expansion valve 60 may selectively expand the refrigerant introduced into the fifth connecting line 25.

[0111] The first valve V1 may be a three-way valve capable of distributing the flow rate while controlling the flow of the refrigerant. In addition, the second valve V2 may be a four-way valve capable of distributing the flow rate while controlling the flow of the refrigerant.

[0112] In addition, the first expansion valve 15 , the second expansion valve 52 , the third expansion valve 55 , and the fourth expansion valve 60 may selectively operate in at least one mode.

[0113] In other words, the first expansion valve 15 , the third expansion valve 55 , and the fourth expansion valve 60 may be bidirectional expansion valves configured to selectively expand the supplied refrigerant while controlling the flow of the refrigerant.

[0114] In addition, the second expansion valve 52 may be a three-way expansion valve configured to selectively expand the supplied refrigerant while controlling the flow of the refrigerant.

[0115] The heat pump system thus configured can control the flow of the refrigerant according to at least one mode for vehicle interior temperature regulation.

[0116] The at least one mode may include first to fifth modes.

[0117] First, in the first mode, the gas-liquid separator 51 operates, and the vehicle interior can be cooled.

[0118] In the second mode, the gas-liquid separator 51 operates, and the vehicle interior can be heated.

[0119] In the third mode, the gas-liquid separator 51 operates, and the vehicle interior can be heated and dehumidified.

[0120] In the fourth mode, the gas-liquid separator 51 does not operate, and the vehicle interior can be cooled.

[0121] Furthermore, in the fifth mode, the gas-liquid separator 51 does not operate, and the vehicle interior may be heated.

[0122] The heat exchanger 14 may condense the refrigerant supplied in the first mode and the fourth mode.

[0123] On the other hand, the heat exchanger 14 may evaporate the supplied refrigerant in the second mode, the third mode, and the fifth mode.

[0124] refer to Figures 2 to 6 The operation and action of the heat pump system according to the thus configured embodiment in each mode are described in detail.

[0125] First, refer to Figure 2 Operation in the first mode for cooling the interior of a vehicle of the heat pump system according to the embodiment, in which the gas injection device 50 operates, is described in detail.

[0126] Figure 2 is an operation diagram of a first mode of a heat pump system for a vehicle according to an embodiment.

[0127] refer to Figure 2 In the first mode, in order to cool the vehicle interior, the compressor 10 is operated so that the refrigerant may flow along the refrigerant line 11 .

[0128] The first expansion valve 15 may stop operating.

[0129] At the same time, the first connecting line 21 may be closed by the operation of the first valve V1 .

[0130] A portion of the second connecting line 22 connected to the interior condenser 13 is closed. More specifically, a portion of the second connecting line 22 connecting the interior condenser 13 and the second end of the third connecting line 23 is closed.

[0131] At the same time, the portion of the second connecting line 22 connected to the second end of the third connecting line 23 and to the first line 53 is opened. In other words, the second connecting line 22 connecting the second end of the third connecting line 23 and the first end of the first line 53 is opened so that the third connecting line 23 can be connected to the first line 53.

[0132] In this embodiment, the third connecting line 23 can be opened by the operation of the second valve V2, and the fourth connecting line 24 can be closed by the operation of the second valve V2.

[0133] Here, the refrigerant line 11 connecting the second valve V2 and the first expansion valve 15 may be closed by the operation of the first expansion valve 15 and the second valve V2.

[0134] In addition, the operation of the second expansion valve 52 may be stopped.

[0135] In addition, the fifth connecting line 25 may be opened by the operation of the fourth expansion valve 60 .

[0136] The first pipeline 53 may be opened by the operation of the third expansion valve 55. At the same time, a portion of the second pipeline 54 connecting the gas-liquid separator 51 and the first end of the fifth connection pipeline 25 may be opened. The supply pipeline 56 may be opened.

[0137] In addition, the third line 57 may be closed by the operation of the second expansion valve 52 .

[0138] Then, the refrigerant introduced into the heat exchanger 14 from the compressor 10 may be condensed while exchanging heat with a working fluid such as ambient air or a coolant.

[0139] Then, the refrigerant condensed at the heat exchanger 14 may be introduced into the second valve V2 along the refrigerant line 11. The second valve V2 may allow the refrigerant supplied to the refrigerant line 11 to flow to the third connecting line 23.

[0140] The refrigerant flowing along the third connecting line 23 may flow along the opened portion of the second connecting line 22 , and may be introduced into the first line 53 .

[0141] At this time, the third expansion valve 55 may expand the refrigerant introduced from the heat exchanger 14 through the third connection line 23 , a portion of the second connection line 22 , and the first line 53 , and supply the expanded refrigerant to the gas-liquid separator 51 .

[0142] The gas-liquid separator 51 may supply the gaseous refrigerant among the refrigerant supplied from the third expansion valve 55 through the first line 53 to the compressor 10 through the opened supply line 56 .

[0143] In other words, the gas injection device 50 may allow the gaseous refrigerant separated while passing through the gas-liquid separator 51 to flow back into the compressor 10 via the supply line 56. Therefore, the gas-liquid separator 51 may increase the flow rate of the refrigerant circulating in the refrigerant line 11.

[0144] The gas-liquid separator 51 may discharge liquid refrigerant among the refrigerant supplied through the first line 53 to the fifth connection line 25 connected to the second line 54 .

[0145] The fourth expansion valve 60 may expand the refrigerant introduced from the gas-liquid separator 51 through a portion of the second line 54 and the fifth connecting line 25 , and supply the expanded refrigerant to the evaporator 17 .

[0146] Ambient air introduced into the HVAC module 12 may be cooled by the low-temperature refrigerant introduced into the evaporator 17 while passing through the evaporator 17 .

[0147] The cooled ambient air may pass through the interior condenser 13 to which the refrigerant is not supplied, and then directly flow into the vehicle interior, so that the vehicle interior may be cooled.

[0148] The refrigerant having passed through the evaporator 17 may be introduced into the compressor 10 .

[0149] In other words, the refrigerant having passed through the evaporator 17 and the refrigerant supplied from the gas-liquid separator 51 via the supply line 56 may be introduced into the compressor 10. The introduced refrigerant may be compressed by the operation of the compressor 10.

[0150] The refrigerant compressed at the compressor 10 may pass through the heat exchanger 14 and then may flow along the refrigerant line 11 to the second valve V2 .

[0151] The heat pump system can then repeat the above process.

[0152] In other words, the heat pump system may increase the flow rate of the refrigerant flowing along the refrigerant line 11 while repeatedly performing the above-mentioned operations.

[0153] Furthermore, the heat pump system can increase the flow rate of the refrigerant flowing along the refrigerant line 11. Therefore, the overall cooling performance and efficiency can be improved, and the vehicle interior can be effectively cooled.

[0154] In this embodiment, reference Figure 3 The operation according to the second mode for heating the vehicle interior, in which the gas-liquid separator 51 operates, is described in detail.

[0155] Figure 3 is an operation diagram of a second mode of a heat pump system for a vehicle according to an embodiment.

[0156] refer to Figure 3 In the second mode, in order to heat the vehicle interior, the compressor 10 is operated so that the refrigerant may flow along the refrigerant line 11 .

[0157] The first expansion valve 15 may stop operating.

[0158] Meanwhile, the refrigerant line 11 connecting the first valve V1 and the second end of the third line 57 may be closed by the operation of the first valve V1.

[0159] The first connecting line 21 can be opened by the operation of the first valve V1. In addition, the second connecting line 22 can be opened.

[0160] In this embodiment, the third connecting line 23 can be closed by the operation of the second valve V2, and the fourth connecting line 24 can be opened by the operation of the second valve V2.

[0161] The fifth connection line 25 may be closed by the operation of the fourth expansion valve 60. In other words, the fourth expansion valve 60 may stop operating.

[0162] The refrigerant line 11 connected from the second valve V2 to the second end of the fourth connecting line 24 may be closed.

[0163] The first pipeline 53 may be opened by the operation of the third expansion valve 55. At the same time, the second pipeline 54 may be opened by the operation of the second expansion valve 52.

[0164] The second connecting line 22 may not be connected to the second line 54 by the operation of the second expansion valve 52 .

[0165] In addition, the supply line 56 may be opened. In addition, the third line 57 may be opened by the operation of the second expansion valve 52 .

[0166] Then, the refrigerant discharged from the compressor 10 may be introduced into the interior condenser 13 along the opened first connecting line 21. The refrigerant introduced into the interior condenser 13 may be condensed while exchanging heat with ambient air introduced into the HVAC module 12.

[0167] Refrigerant discharged from the interior condenser 13 may flow along the second connecting line 22 , and may be introduced into the first line 53 .

[0168] At this time, the third expansion valve 55 may expand the refrigerant introduced from the interior condenser 13 via the second connection line 22 and the first line 53 and supply the expanded refrigerant to the gas-liquid separator 51 .

[0169] The gas-liquid separator 51 may supply the gaseous refrigerant among the refrigerant supplied from the third expansion valve 55 through the first line 53 to the compressor 10 through the opened supply line 56 .

[0170] In other words, the gas injection device 50 may allow the gaseous refrigerant separated while passing through the gas-liquid separator 51 to flow back into the compressor 10 via the supply line 56. Therefore, the gas injection device 50 may increase the flow rate of the refrigerant circulating in the refrigerant line 11.

[0171] The gas-liquid separator 51 may discharge liquid refrigerant in the refrigerant supplied through the first pipeline 53 to the second pipeline 54. At this time, the second expansion valve 52 may expand the refrigerant discharged from the gas-liquid separator 51 through the second pipeline 54 and discharge the expanded refrigerant to the third pipeline 57.

[0172] The refrigerant flowing through the third line 57 may be introduced into the heat exchanger 14 through the refrigerant line 11 .

[0173] At this time, the refrigerant introduced into the heat exchanger 14 may evaporate while exchanging heat with a working fluid such as ambient air or a coolant.

[0174] Then, the refrigerant evaporated at the heat exchanger 14 may be introduced into the second valve V2 along the refrigerant line 11. The second valve V2 may allow the refrigerant supplied to the refrigerant line 11 to flow to the fourth connecting line 24.

[0175] The refrigerant flowing along the fourth connecting line 24 may be introduced into the compressor 10 .

[0176] The heat pump system can then repeat the above process.

[0177] In other words, the refrigerant evaporated at the heat exchanger 14 and the refrigerant supplied from the gas-liquid separator 51 via the supply line 56 may be introduced into the compressor 10. The introduced refrigerant may be compressed by the operation of the compressor 10.

[0178] The refrigerant compressed at the compressor 10 may be supplied to the interior condenser 13 along the refrigerant line 11 and the opened first connecting line 21. The refrigerant supplied to the interior condenser 13 may increase the temperature of ambient air introduced into the HVAC module 12.

[0179] In other words, when passing through the evaporator 17 not supplied with refrigerant, the ambient air introduced from the outside may be introduced at room temperature and has not been cooled. The introduced ambient air may be converted into a high temperature state when passing through the interior condenser 13 and then introduced into the vehicle interior, thereby achieving heating of the vehicle interior.

[0180] Therefore, according to the heat pump system of the embodiment, since the gas injection device 50 works together, the overall heating performance and efficiency can be improved.

[0181] Furthermore, according to the present invention, heating efficiency and performance can be improved while minimizing the use of a separate electric heater.

[0182] In addition, the gas injection device 50 may increase the flow rate of the refrigerant circulating in the refrigerant line 11 , thereby maximizing the heating performance.

[0183] In this embodiment, reference Figure 4 The operation according to the third mode for heating and dehumidifying the vehicle interior, in which the gas injection device 50 operates, is described in detail.

[0184] Figure 4 is an operation diagram of a third mode of the heat pump system for a vehicle according to the embodiment.

[0185] refer to Figure 4 In the third mode, in order to heat and dehumidify the vehicle interior, the compressor 10 is operated so that the refrigerant can flow along the refrigerant line 11 .

[0186] The first expansion valve 15 may stop operating.

[0187] Meanwhile, the refrigerant line 11 connecting the first valve V1 and the second end of the third line 57 may be closed by the operation of the first valve V1.

[0188] The first connecting line 21 can be opened by the operation of the first valve V1. In addition, the second connecting line 22 can be opened.

[0189] In this embodiment, the third connecting line 23 can be closed by the operation of the second valve V2, and the fourth connecting line 24 can be opened by the operation of the second valve V2.

[0190] The fifth connecting line 25 may be opened by the operation of the fourth expansion valve 60 .

[0191] The refrigerant line 11 connected from the second valve V2 to the second end of the fifth connecting line 25 may be closed.

[0192] The first pipeline 53 may be opened by the operation of the third expansion valve 55. At the same time, the second pipeline 54 may be opened by the operation of the second expansion valve 52.

[0193] The second connecting line 22 may not be connected to the second line 54 by the operation of the second expansion valve 52 .

[0194] In addition, the supply line 56 may be opened. In addition, the third line 57 may be opened by the operation of the second expansion valve 52 .

[0195] Then, the refrigerant discharged from the compressor 10 may be introduced into the interior condenser 13 along the opened first connecting line 21. The refrigerant introduced into the interior condenser 13 may be condensed while exchanging heat with ambient air introduced into the HVAC module 12.

[0196] Refrigerant discharged from the interior condenser 13 may flow along the second connecting line 22 , and may be introduced into the first line 53 .

[0197] At this time, the third expansion valve 55 may expand the refrigerant introduced from the interior condenser 13 via the second connection line 22 and the first line 53 and supply the expanded refrigerant to the gas-liquid separator 51 .

[0198] The gas-liquid separator 51 may supply the gaseous refrigerant among the refrigerant supplied from the third expansion valve 55 through the first line 53 to the compressor 10 through the opened supply line 56 .

[0199] In other words, the gas injection device 50 may allow the gaseous refrigerant separated while passing through the gas-liquid separator 51 to flow back into the compressor 10 via the supply line 56. Therefore, the gas injection device 50 may increase the flow rate of the refrigerant circulating in the refrigerant line 11.

[0200] The gas-liquid separator 51 may discharge liquid refrigerant among the refrigerant supplied through the first line 53 to the second line 54 .

[0201] A portion of the refrigerant discharged through the second line 54 may be introduced into the fifth connecting line 25. At this time, the fourth expansion valve 60 may expand the refrigerant introduced from the gas-liquid separator 51 through the second line 54 and the fifth connecting line 25, and supply the expanded refrigerant to the evaporator 17.

[0202] Meanwhile, the second expansion valve 52 may expand the remaining refrigerant in the refrigerant discharged from the gas-liquid separator 51 through the second line 54 and discharge the expanded refrigerant to the third line 57 .

[0203] The refrigerant flowing through the third line 57 may be introduced into the heat exchanger 14 through the refrigerant line 11 .

[0204] At this time, the refrigerant introduced into the heat exchanger 14 may evaporate while exchanging heat with a working fluid such as ambient air or a coolant.

[0205] Then, the refrigerant evaporated at the heat exchanger 14 may be introduced into the second valve V2 along the refrigerant line 11. The second valve V2 may allow the refrigerant supplied to the refrigerant line 11 to flow to the fourth connecting line 24.

[0206] The refrigerant flowing along the fourth connecting line 24 may be introduced into the compressor 10 .

[0207] The heat pump system can then repeat the above process.

[0208] In other words, refrigerant evaporated at the heat exchanger 14, refrigerant supplied from the gas-liquid separator 51 via the supply line 56, and refrigerant supplied from the evaporator 17 may be introduced into the compressor 10. The introduced refrigerant may be compressed by operation of the compressor 10.

[0209] The refrigerant compressed at the compressor 10 may be supplied to the interior condenser 13 along the refrigerant line 11 and the opened first connecting line 21. The refrigerant supplied to the interior condenser 13 may increase the temperature of ambient air introduced into the HVAC module 12.

[0210] In other words, the ambient air introduced into the HVAC module 12 may be dehumidified by the low-temperature refrigerant introduced into the evaporator 17 while passing through the evaporator 17. Thereafter, by being converted into a high-temperature state while passing through the interior condenser 13 and then being introduced into the vehicle interior, it may smoothly heat and dehumidify the vehicle interior.

[0211] Therefore, according to the heat pump system of the embodiment, since the gas injection device 50 works together in heating and dehumidifying the interior of the vehicle, the overall performance and efficiency may be improved.

[0212] Furthermore, according to the present invention, heating efficiency and performance can be improved while minimizing the use of a separate electric heater.

[0213] In addition, the gas injection device 50 may increase the flow rate of the refrigerant circulating in the refrigerant line 11 , thereby maximizing the heating and dehumidification performance.

[0214] In this embodiment, reference Figure 5 The operation according to the fourth mode for cooling the vehicle interior, in which the gas-liquid separator 51 does not operate, is described in detail.

[0215] Figure 5 is an operation diagram of a fourth mode of the heat pump system for a vehicle according to the embodiment.

[0216] refer to Figure 5 In the fourth mode, in order to cool the vehicle interior, the compressor 10 is operated so that the refrigerant may flow along the refrigerant line 11 .

[0217] The refrigerant line 11 may be opened by operation of the first expansion valve 15 , so that the compressor 10 , the heat exchanger 14 , and the evaporator 17 may be connected to each other via the refrigerant line 11 .

[0218] The first connecting line 21 may be closed by the operation of the first valve V1. At the same time, the second connecting line 22 may be closed.

[0219] In addition, the third connecting line 23 and the fourth connecting line 24 may be closed by the operation of the second valve V2 . The fifth connecting line 25 may be closed by the operation of the fourth expansion valve 60 .

[0220] The first pipeline 53 may be closed by the operation of the third expansion valve 55. At the same time, the second pipeline 54 may be closed by the operation of the second expansion valve 52.

[0221] In addition, the supply line 56 may be closed. In addition, the third line 57 may be closed by the operation of the second expansion valve 52 .

[0222] In other words, operations of the second expansion valve 52 , the third expansion valve 55 , and the fourth expansion valve 60 may be stopped.

[0223] Then, the refrigerant discharged from the compressor 10 may be introduced into the heat exchanger 14 along the refrigerant line 11. The refrigerant introduced into the heat exchanger 14 may be condensed while exchanging heat with a working fluid such as ambient air or a coolant.

[0224] Then, the refrigerant condensed at the heat exchanger 14 may pass through the second valve V2 along the refrigerant line 11. Thereafter, the refrigerant may be introduced into the first expansion valve 15.

[0225] The first expansion valve 15 may expand the refrigerant supplied from the heat exchanger 14 and supply the expanded refrigerant to the evaporator 17 .

[0226] In this state, the ambient air introduced into the HVAC module 12 may be cooled by the low-temperature refrigerant introduced into the evaporator 17 while passing through the evaporator 17. In other words, the ambient air cooled while passing through the evaporator 17 may flow directly into the vehicle interior so that the vehicle interior may be cooled.

[0227] The refrigerant having passed through the evaporator 17 may be introduced into the compressor 10. The introduced refrigerant may be compressed by the operation of the compressor 10.

[0228] Refrigerant compressed at the compressor 10 may pass through the heat exchanger 14 and then may be supplied to the first expansion valve 15 along the refrigerant line 11 .

[0229] The heat pump system can then repeat the above process.

[0230] In other words, while repeatedly performing the above-mentioned operations, the heat pump system can effectively cool the interior of the vehicle without operating the gas injection device 50 .

[0231] In this embodiment, reference Figure 6 The operation according to the fifth mode for heating the vehicle interior, in which the gas-liquid separator 51 does not operate, is described in detail.

[0232] Figure 6 is an operation diagram of a fifth mode of the heat pump system for a vehicle according to the embodiment.

[0233] refer to Figure 6 In the fifth mode, in order to heat the vehicle interior, the compressor 10 is operated so that the refrigerant may flow along the refrigerant line 11 .

[0234] The first expansion valve 15 may stop operating.

[0235] Meanwhile, the refrigerant line 11 connecting the first valve V1 and the second end of the third line 57 may be closed by the operation of the first valve V1.

[0236] The first connecting line 21 can be opened by the operation of the first valve V1. In addition, the second connecting line 22 can be opened.

[0237] In this embodiment, the third connecting line 23 can be closed by the operation of the second valve V2, and the fourth connecting line 24 can be opened by the operation of the second valve V2.

[0238] The fifth connection line 25 may be closed by the operation of the fourth expansion valve 60. In other words, the fourth expansion valve 60 may stop operating.

[0239] The refrigerant line 11 connected from the second valve V2 to the second end of the fourth connecting line 24 may be closed.

[0240] The first pipeline 53 may be closed by the operation of the third expansion valve 55. At the same time, the second pipeline 54 may be closed by the operation of the second expansion valve 52.

[0241] The operations of the third expansion valve 55 and the fourth expansion valve 60 may be stopped.

[0242] In addition, the supply line 56 may be closed. In addition, the third line 57 may be opened by the operation of the second expansion valve 52 .

[0243] The second connecting line 22 may be connected to the third line 57 through the operation of the second expansion valve 52 .

[0244] Then, the refrigerant discharged from the compressor 10 may be introduced into the interior condenser 13 along the opened first connecting line 21. The refrigerant introduced into the interior condenser 13 may be condensed while exchanging heat with ambient air introduced into the HVAC module 12.

[0245] Refrigerant discharged from the interior condenser 13 may flow along the second connecting line 22 and may be introduced into the second expansion valve 52 .

[0246] The second expansion valve 52 may expand the refrigerant supplied from the interior condenser 13 via the second connecting line 22 and discharge the expanded refrigerant to the third line 57 .

[0247] The refrigerant flowing through the third line 57 may be introduced into the heat exchanger 14 through the refrigerant line 11 .

[0248] At this time, the refrigerant introduced into the heat exchanger 14 may be evaporated while exchanging heat with a working fluid such as ambient air or a coolant.

[0249] Then, the refrigerant evaporated at the heat exchanger 14 may be introduced into the second valve V2 along the refrigerant line 11. The second valve V2 may allow the refrigerant supplied to the refrigerant line 11 to flow to the fourth connecting line 24.

[0250] The refrigerant flowing along the fourth connecting line 24 may be introduced into the compressor 10 .

[0251] The heat pump system can then repeat the above process.

[0252] In other words, the refrigerant having passed through the heat exchanger 14 may be introduced into the compressor 10. The introduced refrigerant may be compressed by the operation of the compressor 10.

[0253] The refrigerant compressed at the compressor 10 may be supplied to the interior condenser 13 along the refrigerant line 11 and the opened first connecting line 21. The refrigerant supplied to the interior condenser 13 may increase the temperature of ambient air introduced into the HVAC module 12.

[0254] In other words, when passing through the evaporator 17 not supplied with refrigerant, the ambient air introduced from the outside can be introduced at room temperature and has not been cooled. The introduced ambient air can be converted into a high temperature state when passing through the interior condenser 13 and then introduced into the vehicle interior, thereby achieving heating of the vehicle interior.

[0255] Therefore, according to the heat pump system of the embodiment, since the gas injection device 50 works together, the overall heating performance and efficiency can be improved.

[0256] Furthermore, according to the present invention, heating efficiency and performance can be improved while minimizing the use of a separate electric heater.

[0257] In other words, by repeatedly performing these operations, the heat pump system can heat the vehicle interior without operating the gas injection device 50 .

[0258] Therefore, as described above, when the heat pump system for a vehicle according to the embodiment is applied, the flow rate of the refrigerant can be increased by adopting the gas injection device 50, which is configured to selectively operate in at least one mode selected for air conditioning inside the vehicle. Therefore, the cooling and heating performance of the heat pump system can be improved.

[0259] Furthermore, according to the present invention, the performance of the system can be maximized while minimizing the required components by using the gas injection device 50. Therefore, the system can be streamlined and simplified.

[0260] Furthermore, according to the embodiments, manufacturing cost and weight may be reduced by simplifying the entire system, thereby improving space utilization.

[0261] While the invention has been described in conjunction with what is presently considered to be practical embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. On the contrary, the invention 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: a compressor configured to compress a refrigerant; Heating, ventilation and air conditioning (HVAC) module, including the internal condenser and evaporator; a heat exchanger connected to the compressor via a refrigerant line; a first expansion valve, disposed on the refrigerant pipeline between the heat exchanger and the evaporator; a gas injection device connected to the internal condenser or the heat exchanger and configured to selectively expand and flow the refrigerant supplied from the internal condenser or the refrigerant supplied from the heat exchanger to selectively supply a portion of the supplied refrigerant to the compressor and increase a flow rate of the refrigerant circulating in the refrigerant line; a first valve, disposed on the refrigerant pipeline between the compressor and the heat exchanger; a first connecting line having a first end connected to the first valve and a second end connected to the internal condenser; as well as a second connecting line, a first end of which is connected to the internal condenser, and a second end of which is connected to the gas injection device, Therein, the flow of the refrigerant is controlled according to at least one mode for temperature regulation of the vehicle interior.

2. The heat pump system according to claim 1, further comprising: a second valve, disposed on the refrigerant pipeline between the heat exchanger and the first expansion valve; a third connecting pipeline having a first end connected to the second valve and a second end connected to the second connecting pipeline; as well as A fourth connecting line has a first end connected to the second valve and a second end connected to the refrigerant line between the compressor and the evaporator.

3. The heat pump system according to claim 2, wherein: The gas injection device comprises: a gas-liquid separator configured to separate and selectively discharge gaseous refrigerant and liquid refrigerant in the supplied refrigerant; a second expansion valve connected to a second end of the second connecting pipeline; a first pipeline having a first end connected to the second connecting pipeline between the internal condenser and the second expansion valve and a second end connected to the gas-liquid separator; a third expansion valve, disposed on the first pipeline; a second pipeline having a first end connected to the second expansion valve and a second end connected to the gas-liquid separator; and A supply line has a first end connected to the gas-liquid separator and a second end connected to the compressor.

4. The heat pump system according to claim 3, wherein: When the third expansion valve expands and supplies refrigerant in a state of cooling or heating the interior of the vehicle, the gas-liquid separator operates and supplies gaseous refrigerant in the supplied refrigerant to the compressor via the supply line to increase the flow rate of the refrigerant circulating in the refrigerant line.

5. The heat pump system according to claim 3, wherein: The gas injection device further includes a third pipeline having a first end connected to the second expansion valve and a second end connected to the refrigerant pipeline between the first valve and the heat exchanger.

6. The heat pump system according to claim 3, further comprising: a fifth connecting pipeline, a first end of which is connected to the second pipeline between the gas-liquid separator and the second expansion valve, and a second end of which is connected to the refrigerant pipeline between the first expansion valve and the evaporator; as well as The fourth expansion valve is arranged on the fifth connecting pipeline.

7. The heat pump system according to claim 6, wherein: The at least one mode comprises: a first mode for cooling the vehicle interior, wherein the gas-liquid separator operates; a second mode for heating the vehicle interior, wherein the gas-liquid separator operates; a third mode for heating and dehumidifying the vehicle interior, wherein the gas-liquid separator operates; a fourth mode for cooling the vehicle interior, wherein the gas-liquid separator is not operated; and A fifth mode is used to heat the vehicle interior, wherein the gas-liquid separator does not operate.

8. The heat pump system according to claim 7, wherein: In the first mode: The first expansion valve stops operating; The first connecting line is closed by operation of the first valve; The portion of the second connecting line connected to the internal condenser is closed; The portion of the second connecting pipeline connected to the second end of the third connecting pipeline and connected to the first pipeline is opened; The third connecting line is opened by operation of the second valve; the fourth connecting line is closed by operation of the second valve; The fifth connecting line is opened by the operation of the fourth expansion valve; The refrigerant pipeline connecting the second valve and the first expansion valve is closed; The second expansion valve stops operating; The first pipeline is opened by operation of the third expansion valve; The portion of the second pipeline connecting the gas-liquid separator and the first end of the fifth connecting pipeline is opened; The third line is closed by operation of the second expansion valve; The supply line is open; and The gas-liquid separator supplies gaseous refrigerant among the supplied refrigerant to the compressor via the opened supply line, and discharges liquid refrigerant to the fifth connecting line connected to the second line.

9. The heat pump system according to claim 8, wherein: the third expansion valve being configured to expand the refrigerant supplied from the heat exchanger via the third connecting line, a portion of the second connecting line, and the first line, and to supply the expanded refrigerant to the gas-liquid separator; and The fourth expansion valve is configured to expand the refrigerant supplied from the gas-liquid separator via a portion of the second line and the fifth connecting line, and to supply the expanded refrigerant to the evaporator.

10. The heat pump system according to claim 7, wherein: In the second mode: The first expansion valve stops operating; the refrigerant line connecting the first valve and the second end of the third line is closed by the operation of the first valve; The first connecting line is opened by operation of the first valve; The second connecting pipeline is opened; The third connecting pipeline is closed by operation of the second valve; The fourth connecting line is opened by operation of the second valve; The fifth connecting line is closed by the operation of the fourth expansion valve; closing the refrigerant line connecting the second valve to the second end of the fourth connecting line; The first pipeline is opened by operation of the third expansion valve; the second line is opened by operation of the second expansion valve; The second connecting pipeline is not connected to the second pipeline through the operation of the second expansion valve; the supply line is open; The third line is opened by operation of the second expansion valve; and The gas-liquid separator supplies gaseous refrigerant among the supplied refrigerant to the compressor via the opened supply line, and discharges liquid refrigerant to the second expansion valve via the second line.

11. The heat pump system according to claim 10, wherein: the second expansion valve being configured to expand the refrigerant discharged from the gas-liquid separator via the second pipeline and discharge the expanded refrigerant to the third pipeline; the third expansion valve is configured to expand the refrigerant supplied from the interior condenser via the second connecting line and the first line, and supply the expanded refrigerant to the gas-liquid separator; and The fourth expansion valve stops operating.

12. The heat pump system according to claim 7, wherein: In the third mode: The first expansion valve stops operating; the refrigerant line connecting the first valve and the second end of the third line is closed by the operation of the first valve; The first connecting line is opened by operation of the first valve; The second connecting pipeline is opened; The third connecting pipeline is closed by operation of the second valve; The fourth connecting line is opened by operation of the second valve; The fifth connecting line is opened by the operation of the fourth expansion valve; closing the refrigerant line connecting the second valve to the second end of the fifth connecting line; The first pipeline is opened by operation of the third expansion valve; the second line is opened by operation of the second expansion valve; The second connecting pipeline is not connected to the second pipeline through the operation of the second expansion valve; the supply line is open; The third pipeline is opened by operation of the second expansion valve; a portion of the refrigerant discharged from the gas-liquid separator via the second pipeline flows via the fifth connecting pipeline; and The gas-liquid separator supplies gaseous refrigerant among the supplied refrigerant to the compressor via the opened supply line, and discharges liquid refrigerant to the second line.

13. The heat pump system of claim 12, wherein: The second expansion valve is configured to expand the remaining refrigerant in the refrigerant discharged from the gas-liquid separator via the second pipeline and discharge the expanded refrigerant to the third pipeline; the third expansion valve is configured to expand the refrigerant supplied from the interior condenser via the second connecting line and the first line, and supply the expanded refrigerant to the gas-liquid separator; and The fourth expansion valve is configured to expand the refrigerant supplied from the gas-liquid separator via the second line and the fifth connecting line, and to supply the expanded refrigerant to the evaporator.

14. The heat pump system according to claim 7, wherein: In the fourth mode: The refrigerant line is opened by the operation of the first expansion valve so that the compressor, the heat exchanger, and the evaporator can be connected to each other via the refrigerant line; The first connecting line is closed by operation of the first valve; The second connecting pipeline is closed; The third connecting line and the fourth connecting line are closed by operation of the second valve; The fifth connecting line is closed by the operation of the fourth expansion valve; the first pipeline is closed by operation of the third expansion valve; the second line is closed by operation of the second expansion valve; The supply line is closed; and The third line is closed by the operation of the second expansion valve.

15. The heat pump system of claim 14, wherein: The first expansion valve is configured to expand the refrigerant supplied from the heat exchanger and supply the expanded refrigerant to the evaporator; and The second expansion valve, the third expansion valve, and the fourth expansion valve stop operating.

16. The heat pump system according to claim 7, wherein: In the fifth mode: The first expansion valve stops operating; the refrigerant line connecting the first valve and the second end of the third line is closed by the operation of the first valve; The first connecting line is opened by operation of the first valve; The second connecting pipeline is opened; The third connecting pipeline is closed by operation of the second valve; The fourth connecting line is opened by operation of the second valve; The fifth connecting line is closed by the operation of the fourth expansion valve; closing the refrigerant line connecting the second valve to the second end of the fourth connecting line; the first pipeline is closed by operation of the third expansion valve; the second line is closed by operation of the second expansion valve; The supply line is closed; The third line is opened by operation of the second expansion valve; and The second connecting line is connected to the third line through operation of the second expansion valve.

17. The heat pump system of claim 16, wherein: the second expansion valve is configured to expand the refrigerant supplied from the interior condenser via the second connecting line and discharge the expanded refrigerant to the third line; and The third expansion valve and the fourth expansion valve stop operating.

18. The heat pump system according to claim 7, wherein: The heat exchanger is configured to condense the refrigerant supplied in the first mode and the fourth mode.

19. The heat pump system according to claim 7, wherein: The heat exchanger is configured to evaporate refrigerant supplied in the second mode, the third mode, and the fifth mode.

20. The heat pump system according to claim 6, wherein: The first expansion valve, the third expansion valve, and the fourth expansion valve are bidirectional expansion valves that selectively operate in the at least one mode, and are configured to selectively expand the supplied refrigerant while controlling the flow of the refrigerant.

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