Vehicle heat pump system

Abstract

Embodiments of the present invention include a compressor for compressing and circulating refrigerant, a condenser for condensing the compressed refrigerant, a first expansion valve for expanding the condensed refrigerant, an evaporator for allowing heat exchange between cooling water and the refrigerant expanded by the first expansion valve and evaporating, a cabin cooler for allowing heat exchange between air and the cooling water that has passed through the evaporator to cool an indoor space, and a radiator for heat exchanging between outside air and the cooling water that cools electrical components, wherein the cooling water that has passed through the radiator flows into the evaporator during a heating mode.

Description

Technical Field

[0001] Embodiments relate to a vehicle heat pump system. Background Art

[0002] With the development and research of environmentally friendly technologies and alternative energy sources to replace fossil fuels, electric and hybrid vehicles have recently become considered the most attractive areas in the automotive industry. Batteries are installed in electric and hybrid vehicles to provide driving power. The battery power is used not only to drive the vehicle but also to cool or heat the vehicle interior.

[0003] When the battery is used as a heat source for cooling or heating the interior of a vehicle powered by the battery, the driving range is reduced to such an extent. To solve this problem, a method of applying a heat pump system, which has been widely used as a home cooling or heating device in the related art, to a vehicle has been proposed.

[0004] For reference, a heat pump is a process that absorbs heat from low temperatures and transfers it to a higher temperature. For example, a heat pump operates in a cycle where liquid refrigerant evaporates in an evaporator, absorbing heat from the surrounding environment and then returns to liquid refrigerant by dissipating heat to the surrounding environment through a condenser. The application of heat pumps to electric or hybrid vehicles can advantageously eliminate the insufficient heat source found in conventional air conditioner housings.

[0005] Figure 1 is a diagram showing the structure of a secondary loop cooling system of a vehicle heat pump system in the related art.

[0006] Reference Figure 1 The conventional vehicle heat pump system performs cooling and heating by using a refrigerant circulation line circulating through the compressor 10, the condenser 20, the expansion valve 30, and the refrigerator 40, and a coolant circulation line exchanging heat with the refrigerant passing through the refrigerator 40.

[0007] However, there is a problem that the secondary loop cooling system has lower cooling performance than the direct cooling system. Because the secondary loop cooling system mainly cools the coolant and then cools the vehicle interior by cooling the air with the coolant without directly cooling the air, there is a problem of deteriorated efficiency. Summary of the Invention

[0008] Technical issues

[0009] One object of the present embodiment is to improve heating performance by absorbing heat of the outside air in the evaporator by means of the radiator.

[0010] Another object of the present embodiment is to improve heating performance by selectively using external air, waste heat of electrical components, and waste heat of batteries as heat absorption sources.

[0011] Another object of the present embodiment is to simplify the refrigerant circuit by using a secondary circuit and to ensure price competitiveness by reducing the number of heat exchangers and refrigerant valves.

[0012] Yet another object of the present embodiment is to configure a coolant circulation line in which coolant can flow through a radiator and electrical components in series.

[0013] Still another object of the present embodiment is to improve heating performance by allowing the coolant to flow at a constant flow rate in the coolant circulation line using the structure.

[0014] The technical problems to be solved by the present invention are not limited to the above-mentioned technical problems. Those skilled in the art can clearly understand other technical problems not mentioned above through the following description.

[0015] Technical Solution

[0016] One embodiment of the present invention provides a vehicle heat pump system, which includes: a compressor, which is configured to compress and circulate refrigerant; a condenser, which is configured to condense the compressed refrigerant; a first expansion valve, which is configured to expand the condensed refrigerant; an evaporator, which is configured to evaporate the refrigerant expanded by the first expansion valve by allowing the refrigerant to exchange heat with the coolant; a cabin cooler, which is configured to cool the interior of the vehicle by allowing the coolant that has passed through the evaporator to exchange heat with the air; and a radiator, which is configured to allow the coolant used to cool electrical components to exchange heat with the outside air, wherein, in a heating mode, the coolant that has passed through the radiator flows into the evaporator.

[0017] In particular, the vehicle heat pump system may further include: a heating line configured to heat the vehicle interior by circulating a coolant that exchanges heat with a refrigerant through the condenser; and a cooling line configured to cool the battery and the electric components by circulating a coolant that exchanges heat with air or a refrigerant.

[0018] In particular, a third coolant connection and a fifth coolant connection may be provided in the refrigeration line, thereby defining a fifth refrigeration line circulating through the radiator and the evaporator.

[0019] In particular, the fifth refrigerant line may be connected to a cooling line configured to cool the vehicle interior by circulating a coolant exchanging heat with a refrigerant through the evaporator, and the cabin cooler may be provided in the cooling line.

[0020] In particular, a fourth coolant joint configured to be connected to the cooling line may be provided in the fifth refrigeration line, and a fifth directional switching valve configured to determine whether to circulate coolant to the cooling line may be provided in the fifth refrigeration line.

[0021] In particular, the cooling line may include a third pump connected between the evaporator and the cabin cooler, and the third pump may be provided between the fourth coolant connection and the evaporator.

[0022] In particular, the vehicle heat pump system may include: a first connecting line branched from one side of the refrigeration line and connected to the heating line; and a second connecting line branched from the other side of the refrigeration line and connected to the heating line.

[0023] In particular, the first connecting line, the second connecting line, and the heating line may be connected to a second directional switching valve, and the cooling line and the heating line may be connected to or disconnected from each other through the second directional switching valve.

[0024] In particular, the electric component may be provided in the second connecting line, and a third connecting line branched from a first coolant junction provided in the refrigeration line may be provided to pass through a refrigeration machine.

[0025] In particular, a fourth directional switching valve may be provided in the second connecting line, the fourth directional switching valve controlling the flow direction of the coolant that has passed through the electrical component, the fourth directional switching valve may be connected to the third coolant joint of the third connecting line via a fourth connecting line, and the third coolant joint may be provided on a side adjacent to the inlet of the refrigerator.

[0026] In particular, the refrigerant that has passed through the condenser may include: a first refrigerant pipeline, which branches from one side of the refrigerant branch part and passes through the first expansion valve and the evaporator; and a second refrigerant pipeline, which branches from the other side of the refrigerant branch part and passes through the second expansion valve and the refrigerator.

[0027] In particular, a refrigerant heat exchanger may be provided in the first refrigerant line, the refrigerant heat exchanger may be provided between the refrigerant branch portion and the first expansion valve, and the refrigerant introduced into the first expansion valve and the refrigerant having passed through the evaporator may exchange heat with each other.

[0028] In particular, the heating line may include: a heater core configured to heat the vehicle interior using air heated when air introduced into the vehicle interior exchanges heat with the coolant that exchanges heat with the refrigerant through the condenser; and a coolant heater that is provided in front of the heater core based on a flow direction of the coolant and configured to heat the coolant.

[0029] In particular, in the heating mode, the fifth directional switching valve may close the flow path of the cooling line.

[0030] In particular, the fourth directional switching valve controls the direction of the coolant so that the coolant that absorbs heat from the radiator and the electric components passes through the refrigerator.

[0031] In particular, in the cooling mode, the fifth directional switching valve can circulate the cooling line in a closed loop.

[0032] In particular, the vehicle heat pump system may include: a refrigerant circulation line, in which the compressor, the condenser, the evaporator, and the refrigerator are arranged, and the refrigerant circulates in the refrigerant circulation line; a refrigeration line, which is configured to cool the battery by circulating the coolant that exchanges heat with the air or the refrigerant; a cooling line, in which the cabin cooler is arranged, which is configured to cool the vehicle interior by using the coolant that passes through the evaporator; and a cooling connecting line, which is configured to connect the cooling line and the refrigeration line, the refrigeration line and the cooling line can be connected by a first directional switching valve, and the refrigeration line and the cooling line can be separated and connected according to the air-conditioning mode.

[0033] In particular, one side of the cooling connecting line may be arranged between the evaporator and the cabin cooler.

[0034] In particular, the refrigerant circulation pipeline may include: the compressor; the condenser; the refrigerant branch portion; a first refrigerant pipeline, which branches from the refrigerant branch portion toward one side and is configured so that the first expansion valve and the evaporator are arranged in the first refrigerant pipeline; a second refrigerant pipeline, which branches from the refrigerant branch portion toward the other side and is configured so that the second expansion valve and the refrigerator are arranged in the second refrigerant pipeline; and an accumulator, through which the refrigerant that has passed through the first refrigerant pipeline and the second refrigerant pipeline passes.

[0035] In particular, the refrigerant circulation line may further include a refrigerant heat exchanger in which the refrigerant passing through the condenser and the refrigerant passing through the accumulator exchange heat with each other.

[0036] In particular, the vehicle heat pump system may further include a heating line configured to heat the vehicle interior by circulating a coolant that exchanges heat with a refrigerant through the condenser.

[0037] In particular, the vehicle heat pump system may include: a first connecting line branched from one side of the refrigeration line and connected to the heating line; and a second connecting line branched from the other side of the refrigeration line and connected to the heating line.

[0038] In particular, the first connecting line, the second connecting line, and the heating line may be connected to a second directional switching valve, and the cooling line and the heating line may be connected to or disconnected from each other through the second directional switching valve.

[0039] In particular, the electrical component may be arranged in the first connecting line.

[0040] In particular, a third connecting line branched from a first coolant junction provided in the refrigeration line may be provided to pass through the refrigerator, and a third directional switching valve connected to the refrigeration line may be provided in the third connecting line.

[0041] In particular, the third connecting line may be provided in parallel with the refrigeration line provided with the battery.

[0042] Particularly, a storage tank is provided at a connection portion between the first connecting line and the refrigeration line.

[0043] In particular, when the air-conditioning mode is the heating mode, one region of the refrigeration line and one region of the cooling line may be connected by operation of the first direction switching valve so that coolant may circulate.

[0044] In particular, the battery may be disposed in the third connecting line, a fourth connecting line may be disposed between the battery and the refrigerator, one side of the fourth connecting line may be connected to the second connecting line, the other side of the fourth connecting line may be connected to the third connecting line, and a fourth directional switching valve may be disposed in an area where the second connecting line and the fourth connecting line are connected.

[0045] In particular, the vehicle heat pump system may include: a second expansion valve, which is configured to expand the condensed refrigerant; a refrigerator, which is configured to allow the refrigerant expanded by the second expansion valve to exchange heat with the coolant; and the electrical components, which are configured to be cooled by the coolant, and in the heating mode, the coolant that has passed through the radiator can exchange heat with the electrical components and then flow into the refrigerator.

[0046] In particular, the vehicle heat pump system may further include: a heating line configured to heat the vehicle interior by circulating a coolant that exchanges heat with a refrigerant through a first heat exchanger; and a cooling line configured to cool the heat-generating components and the electrical components by circulating a coolant that exchanges heat with air or a refrigerant.

[0047] In particular, the vehicle heat pump system may include: a first connecting line branched from one side of the refrigeration line and connected to the heating line; and a second connecting line branched from the other side of the refrigeration line and connected to the heating line.

[0048] In particular, the first connecting line, the second connecting line, and the heating line may be connected to a second directional switching valve, and the cooling line and the heating line may be connected to or disconnected from each other through the second directional switching valve.

[0049] In particular, the electric component may be provided in the second connecting line, and a third connecting line branched from a first coolant junction provided in the refrigeration line may be provided to pass through the refrigeration machine.

[0050] In particular, a fourth directional switching valve may be provided in the second connecting line, the fourth directional switching valve controlling the flow direction of the coolant that has passed through the electrical component, the fourth directional switching valve may be connected to the third coolant joint of the third connecting line via a fourth connecting line, and the third coolant joint may be provided on a side adjacent to the inlet of the refrigerator.

[0051] In particular, the first coolant connection and the third coolant connection may be integral and have four branch lines.

[0052] In particular, the vehicle heat pump system may further include a second cooling line configured to cool the vehicle interior by circulating a coolant that exchanges heat with a refrigerant through the second heat exchanger.

[0053] In particular, the second cooling line may include: a cabin cooler configured to cool the vehicle interior using air cooled when air introduced into the vehicle interior exchanges heat with the refrigerant through the second heat exchanger; and a third pump connected between the second heat exchanger and the cabin cooler, and the coolant line connected to the second heat exchanger, the third pump, and the cabin cooler may define a closed loop.

[0054] In particular, the vehicle heat pump system may further include an air conditioning device having a blower configured to blow air into the vehicle interior, the second heat exchanger and the third pump may be disposed outside the air conditioning device, and the cabin cooler may be disposed inside the air conditioning device.

[0055] In particular, the refrigerant that has passed through the first heat exchanger may include: a first refrigerant pipeline, which branches from one side of the refrigerant branch part and passes through the first expansion valve and the second heat exchanger; and a second refrigerant pipeline, which branches from the other side of the refrigerant branch part and passes through the second expansion valve and the refrigerator.

[0056] In particular, a refrigerant heat exchanger may be provided in the first refrigerant line, the refrigerant heat exchanger may be provided between the refrigerant branch portion and the first expansion valve, and the refrigerant introduced into the first expansion valve and the refrigerant having passed through the second heat exchanger may exchange heat with each other.

[0057] In particular, the heating line may include: a heater core configured to heat the vehicle interior using air heated when air introduced into the vehicle interior exchanges heat with the coolant that exchanges heat with the refrigerant through the first heat exchanger; and a coolant heater that is provided in front of the heater core based on a flow direction of the coolant and is configured to heat the coolant.

[0058] In particular, in the cooling mode, the heating line and the cooling line may be connected to each other.

[0059] In particular, the fourth directional switching valve can block the coolant from flowing into the refrigerator.

[0060] In particular, in the heating mode, the heating line and the cooling line may be separated from each other, and the coolant flowing along the cooling line may absorb heat while passing through the radiator and the electrical components and perform heat exchange with the refrigerant in the refrigerator.

[0061] Beneficial effects

[0062] According to the present embodiment, in the evaporator, the radiator can absorb heat from the outside air, thereby improving heating performance.

[0063] Furthermore, the flow rate in the heat-absorbing cooling flow path can be increased by changing the position of the pump for cooling the vehicle interior, thereby improving the heating performance.

[0064] In addition, external air, waste heat from electrical components, and waste heat from batteries can be selectively used as heat sinks, thereby improving heating performance depending on the heating situation.

[0065] According to the present embodiment, it is possible to simplify the refrigerant circuit by using the secondary circuit, and to ensure price competitiveness by reducing the number of heat exchangers and refrigerant valves.

[0066] In addition, various air conditioning modes can be realized by using multiple valve structures.

[0067] Furthermore, the vehicle interior can be heated by using only the waste heat of the electric components and the waste heat of the battery.

[0068] Furthermore, the temperature of the battery can be increased while heating the vehicle interior.

[0069] In addition, the heat absorption and heating performance can be improved by improving the structure of the system.

[0070] In addition, by improving the structure, it is possible to improve the heating efficiency while implementing the cooling and heating circulation lines in the related art.

[0071] In addition, the heating performance can be improved by improving the performance of absorbing the waste heat of the electrical components. In addition, the maximum heating performance can be achieved by using a structure that can absorb the heat of the external air and the waste heat of the electrical components at the same time.

[0072] Various beneficial advantages and effects of the present disclosure are not limited to the above-mentioned contents and can be more easily understood in the course of describing specific embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 1 is a view showing the structure of a secondary loop cooling system of a conventional vehicle heat pump system according to a first embodiment of the present invention.

[0074] Figure 2 FIG. 4 is a structural diagram of a vehicle heat pump system according to an embodiment of the present invention.

[0075] Figure 3 It shows Figure 2 FIG. 1 is a view of a first embodiment of the present invention.

[0076] Figure 4 It shows Figure 2 A view of the operating status of the system in heating mode.

[0077] Figure 5 It shows Figure 3 A view of the operating status of the system in heating mode.

[0078] Figure 6 It shows Figure 3 A view of the operating status of the system in cooling mode.

[0079] Figure 7 FIG. 1 is a structural diagram of a vehicle heat pump system according to a second embodiment of the present invention.

[0080] Figure 8 It shows Figure 7 A view of the operation of the first air-conditioning mode.

[0081] Figure 9 It shows Figure 7 A view of the operation of the second air-conditioning mode.

[0082] Figure 10 It shows Figure 7 A view of the operation of the third air-conditioning mode.

[0083] Figure 11 It shows Figure 7 A view of the operation of the fourth air-conditioning mode.

[0084] Figure 12 It shows Figure 7A view of the operation of the fifth air-conditioning mode.

[0085] Figure 13 It shows Figure 1 A view of the operation of the sixth air-conditioning mode.

[0086] Figure 14 FIG. 1 is a structural diagram of a vehicle heat pump system according to a third embodiment of the present invention.

[0087] Figure 15 It shows Figure 14 A view of the operation of the first air-conditioning mode.

[0088] Figure 16 It shows Figure 14 A view of the operation of the second air-conditioning mode.

[0089] Figure 17 It shows Figure 14 A view of the operation of the third air-conditioning mode.

[0090] Figure 18 It shows Figure 14 A view of the operation of the fourth air-conditioning mode.

[0091] Figure 19 It shows Figure 14 A view of the operation of the fifth air-conditioning mode.

[0092] Figure 20 It shows Figure 8 A view of the operation of the sixth air-conditioning mode.

[0093] Figure 21 FIG4 is a structural diagram of a vehicle heat pump system according to a fourth embodiment of the present invention.

[0094] Figure 22 It shows Figure 21 FIG. 1 is a view of a first embodiment of the present invention.

[0095] Figure 23 It shows Figure 21 A view of the system operating status in maximum heating mode.

[0096] Figure 24 It shows Figure 21 A view of the operating status of the system in cooling mode.

[0097] Figure 25 is a view showing an operating state of the system in a normal heating mode. DETAILED DESCRIPTION

[0098] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0099] However, the technical spirit of the present invention is not limited to the embodiments described herein, but can be implemented in various forms. Within the scope of the technical spirit of the present invention, one or more components in the embodiments can be selectively combined and replaced.

[0100] In addition, unless otherwise specifically and explicitly defined and stated, the terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as the meanings commonly understood by those of ordinary skill in the art to which the present invention belongs. The meanings of commonly used terms such as terms defined in dictionaries may be interpreted taking into account the contextual meanings of the relevant technology.

[0101] Furthermore, the terms used in the embodiments of the present invention are for explaining the embodiments rather than for limiting the present invention.

[0102] In this specification, unless otherwise specifically stated, a singular form may also include a plural form. The expression "at least one (or one or more) of A, B, and C" may include one or more of all combinations that can be formed by combining A, B, and C.

[0103] Additionally, the terms first, second, A, B, (a), and (b) may be used to describe components of embodiments of the present invention.

[0104] These terms are used only for the purpose of distinguishing one component from another, and the nature, order or sequence of the components are not limited by these terms.

[0105] In addition, when one component is described as being “connected,” “coupled,” or “attached” to another component, the one component may be directly connected, coupled, or attached to the other component or connected, coupled, or attached to the other component with another component interposed therebetween.

[0106] In addition, the statement "a component is formed or arranged above (on) or below (under) another component" includes not only the case where the two components are in direct contact with each other, but also the case where one or more additional components are formed or arranged between the two components. In addition, the expression "above (on) or below (under)" can include the meaning of a downward direction as well as an upward direction based on one component.

[0107] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. The same or corresponding components are given the same reference numerals regardless of the reference numerals, and their repeated descriptions will be omitted.

[0108] Figures 2 to 25Only the essential features of the present invention are clearly shown for conceptual and clear understanding. Therefore, various modifications of the drawings are contemplated, and the scope of the present invention is not necessarily limited to the specific shapes shown in the drawings.

[0109] Figures 2 to 6 A first embodiment of the present invention is shown.

[0110] Figure 2 FIG. 4 is a structural diagram of a vehicle heat pump system according to an embodiment of the present invention.

[0111] See also Figure 2 A vehicle heat pump system according to an embodiment of the present invention may include a refrigerant circulation line 100 configured to circulate refrigerant and cool the vehicle interior, and a coolant circulation line 200 configured to circulate coolant, heat the vehicle interior, and cool components. Coolant circulation line 200 may include a heating line 230 configured to heat the vehicle interior and a cooling line 210 configured to cool electrical components 253 and a battery 213.

[0112] The refrigerant circulation line 100 may include: a compressor 110; a condenser 120; a refrigerant branching portion 101; a first refrigerant line 100a that branches from the refrigerant branching portion 101 toward one side and is configured to pass through a first expansion valve and an evaporator 140; a second refrigerant line 100b that branches from the refrigerant branching portion 101 toward the other side and is configured to pass through a second expansion valve and a refrigerator 160; and an accumulator 170, through which the refrigerant that has passed through the first and second refrigerant lines 100a, 100b passes. The refrigerant that has passed through the accumulator 170 flows back into the compressor 110, thereby completing the refrigerant circulation.

[0113] In this case, the refrigerant heat exchanger 180 may be provided in the first refrigerant line 100a. The refrigerant heat exchanger 180 may be provided between the refrigerant branch portion 101 and the first expansion valve 130 so that the refrigerant introduced into the first expansion valve 130 can exchange heat with the refrigerant having passed through the evaporator 140.

[0114] The compressor 110 operates by receiving power from an engine (internal combustion engine) or a motor. The compressor 110 sucks in refrigerant, compresses the refrigerant into a high-temperature and high-pressure gaseous refrigerant, and then discharges the refrigerant to the condenser 120.

[0115] Condenser 120 functions as a condenser in both cooling mode and heating mode. Refrigerant flowing through condenser 120 exchanges heat with coolant in coolant circulation line 200, which will be described below, and then flows to first expansion valve 130. As described above, coolant heated by the refrigerant in condenser 120 can be supplied to the internal heat exchanger via coolant circulation line 200. In one embodiment, a water-cooled condenser 120 may be used as condenser 120.

[0116] The refrigerant branching portion 101 distributes the refrigerant to the first refrigerant line 100 a and the second refrigerant line 100 b .

[0117] A first expansion valve 130 and an evaporator 140 may be provided in the first refrigerant line 100 a .

[0118] The first expansion valve 130 may throttle the refrigerant introduced from the first refrigerant line 100a, perform a bypass operation on the refrigerant, or block the flow of the refrigerant. The first expansion valve 130 may be disposed at a side adjacent to the inlet of the evaporator 140 based on the flow direction of the refrigerant.

[0119] The evaporator 140 is installed in the air conditioning housing and is provided in the first refrigerant line 100a. As the refrigerant discharged from the first expansion valve 130 is supplied to the evaporator 140 and the air flowing in the air conditioning housing by the blower passes through the evaporator 140, the air exchanges heat with the low-temperature, low-pressure refrigerant in the evaporator 140 and is converted into cool air. The cool air is discharged into the vehicle interior and cools the passenger compartment.

[0120] A second expansion valve and a refrigerator 160 may be provided in the second refrigerant line 100b.

[0121] The second expansion valve may throttle the refrigerant introduced from the second refrigerant line 100b, perform a bypass operation on the refrigerant, or block the flow of the refrigerant. The second expansion valve may be provided at a side adjacent to the inlet of the refrigerator 160 based on the flow direction of the refrigerant.

[0122] The low-temperature, low-pressure refrigerant discharged from the second expansion valve is supplied to the refrigerator 160 and performs heat exchange with the coolant flowing in the coolant circulation line 200. The cold coolant generated by the heat exchange in the refrigerator 160 can circulate through the coolant circulation line 200 and perform heat exchange with the high-temperature battery 213. That is, the battery 213 performs heat exchange with the coolant instead of the refrigerant.

[0123] The accumulator 170 is installed on a side adjacent to the inlet of the compressor 110. The refrigerant that has passed through the evaporator 140 and / or the refrigerator 160 is merged into the accumulator 170. The accumulator 170 can separate the refrigerant into liquid refrigerant and gaseous refrigerant and supply only the gaseous refrigerant to the compressor 110.

[0124] The refrigerant heat exchanger 180 allows the refrigerant introduced into the first expansion valve 130 and the refrigerant discharged from the evaporator 140 to exchange heat with each other, thereby improving the cooling performance. In this case, the inlet-side refrigerant pipeline is configured to connect the refrigerant branch portion 101 and the first expansion valve 130, and is configured so that the refrigerant introduced into the evaporator 140 therethrough passes through the refrigerant heat exchanger 180, and the outlet-side refrigerant pipeline is configured to connect the evaporator 140 and the accumulator 170, and is configured so that the refrigerant discharged from the evaporator 140 therethrough passes through the refrigerant heat exchanger 180, so that the refrigerant passing through the inlet-side refrigerant pipeline and the refrigerant passing through the outlet-side refrigerant pipeline can exchange heat with each other.

[0125] Therefore, before the refrigerant is introduced into the first expansion valve 130, the refrigerant can be further cooled by the refrigerant heat exchanger 180, thereby improving the cooling performance achieved by the evaporator 140 and increasing the efficiency of the cooling system. In particular, the refrigerant heat exchanger 180 and the refrigerator 160 are connected in parallel.

[0126] That is, refrigerant heat exchanger 180 is not arranged in series between condenser 120 and refrigerator 160 in the refrigerant line. Instead, refrigerant heat exchanger 180 is arranged adjacent to evaporator 140, allowing refrigerant heat exchanger 180 and evaporator 140 to be arranged and connected in series. If the refrigerant heat exchanger is arranged in series between water-cooled condenser 120 and refrigerator 160, heating performance may be reduced due to the pressure drop on the low-pressure side in heating mode. In contrast, when the refrigerant heat exchangers are connected in parallel, both cooling and heating performance are improved. This is because there is no refrigerant heat exchanger between condenser 120 and refrigerator 160 in the flow of refrigerant in heating mode.

[0127] The coolant circulation line 200 may include a heating line 230 configured to heat the interior of the vehicle, and a refrigeration line 210 and a cooling line 220 configured to cool the electric components 253 and the battery 213 .

[0128] The heating line 230 may include the condenser 120 , a second pump 232 , a coolant heater 233 , a heater core 234 , and a second direction switching valve 231 .

[0129] As described above, the refrigerant and the coolant may exchange heat with each other while passing through the condenser 120 .

[0130] The second pump 232 is a device for pumping the coolant so that the coolant circulates along the heating line 230. The second pump 232 may be installed in the coolant line and disposed rearward of the condenser 120 based on a flow direction of the coolant.

[0131] The coolant heater 233 is a device for heating the coolant. It is connected and positioned behind the second pump 232 and in front of the heater core 234, based on the coolant's flow direction. Furthermore, the coolant heater 233 operates when the coolant temperature is equal to or lower than a specific temperature. Various components capable of generating heat using electricity, such as an induction heater, a sheath heater, a PTC heater, or a film heater, can be used as the coolant heater 233.

[0132] Heater core 234 may be provided in the vehicle's air conditioning unit 190. Air flowing from the blower may be heated while passing through heater core 234, supplied to the vehicle interior, and used to heat the vehicle interior. Furthermore, heater core 234 may be connected and provided behind coolant heater 233 based on the flow direction of the coolant.

[0133] The second directional switching valve 231 may be installed between the heater core 234 and the condenser 120 and configured to selectively connect or disconnect the heating line 230 and the cooling line 210 , as described below.

[0134] More specifically, a second directional switching valve 231 may be installed in the heating line 230. Two coolant lines may be connected to the second directional switching valve 231. A single first connecting line 250 branching from one side of the cooling line 210 may be connected to the second directional switching valve 231. A single second connecting line branching from the other side of the cooling line 210 may be connected to the second directional switching valve 231. In other words, four coolant lines may be connected to the second directional switching valve 231 so as to converge. The second directional switching valve 231 may be a four-way directional switching valve capable of adjusting the state in which the four coolant lines are connected or disconnected from one another.

[0135] The cooling line 210 may include a radiator 211 , a first directional switching valve 212 , a fourth pump 252 , a second directional switching valve 231 , an electrical component 253 , a first coolant joint 271 , a second coolant joint 262 , a first pump 214 , a battery 213 , a refrigerator 160 , and a third directional switching valve 215 .

[0136] The radiator 211 cools the coolant that has exchanged heat with the electric component 253 or the battery 213. The radiator 211 may be cooled by a cooling fan 211a in an air cooling manner.

[0137] A first directional switching valve 212 may be installed in the cooling line 210. Two coolant pipes may be connected to the first directional switching valve 212. The second directional switching valve 231 and the first directional switching valve 212 may be connected via a first connecting line 250, such that the heating line 230 and the cooling line 210 are connected.

[0138] That is, the three coolant lines may be connected to the first directional switching valve 212 so as to be merged together. The first directional switching valve 212 may be a three-way directional switching valve capable of adjusting a state in which the three coolant lines are connected or disconnected from each other.

[0139] The fourth pump 252 is a device for pumping the coolant so that the coolant circulates along the refrigeration line 210. In addition, the fourth pump 252 is installed in the first connecting line 250 and is provided between the second directional switching valve 231 and the first directional switching valve 212. The operation of the fourth pump 252 can allow the coolant to flow from the first directional switching valve 212 to the second directional switching valve 231.

[0140] The second directional switching valve 231 is as described above with reference to the heating line 230 .

[0141] The electrical component 253 is provided in the second connecting line 260 connecting the second directional switching valve 231 and the second coolant joint 262. The electrical component 253 can be cooled by the coolant. In addition, the electrical component 253 can be a drive motor, an inverter, a charger (on-board charger (OBC)), etc.

[0142] The first pump 214 is a device for pumping coolant so that the coolant circulates along the refrigeration line 210. In addition, the first pump 214 is installed in the coolant line and provided between the first coolant joint 271 and the battery 213 so that the coolant can flow from the first pump 214 to the battery 213.

[0143] Battery 213 serves as the vehicle's power source. It can be used as a drive source for various electrical components 253 in the vehicle. Furthermore, battery 213 can be connected to a fuel cell and used to store electricity. Alternatively, battery 213 can be used to store externally supplied electricity. Furthermore, battery 213 can be positioned in the coolant line between first pump 214 and third directional switching valve 215. This allows battery 213 to be cooled or heated by exchanging heat with the flowing coolant.

[0144] First coolant joint 271 is installed in the coolant line and is located behind first directional switching valve 212 based on the coolant flow direction. Three coolant lines are connected to first coolant joint 271 so as to converge. That is, first coolant joint 271 can be installed so that its two opposing sides are connected to refrigeration line 210, and third connecting line 270 can be connected to the lower side of first coolant joint 271. In this case, third connecting line 270 can be connected so as to pass through refrigerator 160.

[0145] The second coolant joint 262 may be installed at the point where the rear end of the second connecting line 260 intersects the refrigeration line 210. The three coolant lines are connected to the second coolant joint 262 so as to converge together. That is, the second coolant joint 262 may be installed so that its two opposite sides are connected to the refrigeration line 210, and the second connecting line 260 may be connected to the upper side of the second coolant joint 262.

[0146] Chiller 160 is as described above with reference to heating line 230 .

[0147] A third directional switching valve 215 may be installed in the coolant line and disposed between the battery 213 and the second coolant connector 262. Two coolant pipes may be connected to the third directional switching valve 215. A third connecting line 270 may be connected to the upper side of the third directional switching valve 215, allowing the battery 213 and the third connecting line 270 to be connected in parallel. In this case, the first directional switching valve 212 may be a three-way directional switching valve capable of adjusting the connection or disconnection state of the three coolant lines.

[0148] In addition, a blower may be installed on one side of the air conditioning unit 190 to blow air. A temperature adjustment door may be installed in the air conditioning unit 190. In addition, the evaporator 140 and the heater core 234 provided in the air conditioning unit 190 may be provided and configured so that, depending on the operation of the temperature adjustment door, air discharged from the blower may flow into the vehicle interior while passing through only the evaporator 140 or while passing through the evaporator 140 and then the heater core 234.

[0149] The fifth connecting line 290 may be provided in the refrigeration line 210. The fifth connecting line 290 may connect a sixth coolant joint 290c and a fifth coolant joint 290b, the sixth coolant joint 290c may be provided between the radiator 211 and the first directional switching valve 212, and the fifth coolant joint 290b may be provided between the radiator 211 and the second coolant joint 262.

[0150] The fifth connecting line 290 may be provided to pass through the evaporator 140. The coolant having passed through the radiator 211 may circulate through the evaporator 140 according to an air-conditioning mode.

[0151] In the fifth connecting line 290 , the fourth coolant joint 290 a may be provided at a side adjacent to the inlet of the evaporator 140 , and the fifth direction switching valve 291 may be provided at a side adjacent to the outlet of the evaporator 140 .

[0152] The cooling line 220 may be connected to a fourth coolant joint 290 a and a fifth directional switching valve 291 .

[0153] Cooling line 220 may include evaporator 140 , cabin cooler 222 , and third pump 221 . In this case, the coolant line connecting evaporator 140 , cabin cooler 222 , and third pump 221 may define a closed loop according to operation of fifth directional switching valve 291 .

[0154] As described above, the refrigerant and the coolant may exchange heat with each other while passing through the evaporator 140 .

[0155] Cabin cooler 222 serves as air-cooled evaporator 140. Coolant cooled by heat exchange with the refrigerant passing through evaporator 140 passes through cabin cooler 222. Cabin cooler 222 is provided in air conditioning unit 190. Air flowing from a blower of air conditioning unit 190 is cooled while passing through cabin cooler 222, supplied to the vehicle interior, and used to cool the vehicle interior.

[0156] The third pump 221 is used to pump the coolant so that the coolant circulates along the cooling line 220. In addition, the third pump 221 is installed in the fifth connecting line 290 and is provided between the evaporator 140 and the fourth coolant joint 290a. The operation of the third pump 221 can circulate the coolant.

[0157] Therefore, the vehicle heat pump system according to the present invention employs cooling line 220, which uses a coolant to cool the vehicle interior, allowing the refrigerant circulation line 100, through which the refrigerant circulates, to be located outside the vehicle interior rather than within the vehicle interior. This reduces the length of the refrigerant pipe, reduces the amount of refrigerant, and modularizes the components in refrigerant circulation line 100. Furthermore, a highly efficient natural refrigerant can be used as the refrigerant for refrigerant circulation line 100, which improves the efficiency of the thermal management system.

[0158] Figure 3 It shows Figure 2 FIG. 1 is a view of a first embodiment of the present invention. Figure 3 It shows Figure 2 FIG. 1 is a view of a structure in which a fourth connecting pipeline is provided.

[0159] Reference Figure 3 The fourth directional switching valve 261 may be provided in the second connecting line 260 and controls the flow direction of the coolant that has passed through the electric component 253. The fourth directional switching valve 261 is provided in a fourth connecting line 280 branched from the second connecting line 260. The fourth connecting line 280 may be connected to a third coolant joint 272 provided in the third connecting line 270.

[0160] The third coolant joint 272 is provided at a side adjacent to the inlet of the refrigerator 160 through which the coolant is introduced. The coolant having passed through the electric component 253 may be introduced into the refrigerator 160 according to the operation of the fourth directional switching valve 261.

[0161] In one embodiment, when the upper side and the right side of the fourth directional switching valve 261 are connected, the electrical component 253 and the refrigerator 160 may be connected in series.

[0162] Figure 4 It shows Figure 2 A view of the operating status of the system in heating mode.

[0163] Reference Figure 4 In the refrigerant circulation line 100, the compressor 110 operates, and high-temperature, high-pressure refrigerant is discharged from the compressor 110. Furthermore, the refrigerant discharged from the compressor 110 is cooled while exchanging heat with the coolant in the condenser 120. Thereafter, the refrigerant cooled and condensed in the condenser 120 is divided in the refrigerant branch portion 101. A portion of the refrigerant passes through the refrigerant heat exchanger 180, and is then throttled and expanded while passing through the first expansion valve 130. Thereafter, the expanded refrigerant exchanges heat with the coolant in the secondary cooling line 220 while passing through the evaporator 140, and the coolant in the secondary cooling line 220 is cooled by the refrigerant.

[0164] In addition, the refrigerant evaporated in the evaporator 140 passes through the refrigerant heat exchanger 180 , exchanges heat with the refrigerant before being introduced into the first expansion valve 130 , and then flows into the compressor 110 again via the accumulator 170 .

[0165] The remaining refrigerant divided in the refrigerant branching portion 101 is throttled and expanded while passing through the second expansion valve 150. The expanded refrigerant then evaporates by exchanging heat with the coolant while passing through the refrigerator 160, thereby cooling the coolant. The refrigerant evaporated in the refrigerator 160 flows back into the compressor 110 via the accumulator 170.

[0166] As described above, the refrigerant having passed through the evaporator 140 and the refrigerant having passed through the refrigerator 160 merge with each other in the accumulator 170 and flow into the compressor 110. As the above process is repeated, the refrigerant circulates.

[0167] At the same time, the coolant in the coolant circulation line 200 circulates by the operation of the second pump 232, the fourth pump 252, the first pump 214, and the third pump 221. Furthermore, the coolant can be heated while passing through the condenser 120, heated by the coolant heater 233, and heated by the waste heat of the electrical components 253. The coolant can also be cooled while passing through the refrigerator 160. In this case, the second directional switching valve 231 and the first directional switching valve 212 can adjust their directions so that the heating line 230 and the cooling line 210 are separated.

[0168] More specifically, the coolant can flow when the upper side and the right side of the second directional switching valve 231 are connected to each other, and the coolant can flow when the lower side and the left side of the second directional switching valve 231 are connected to each other. In addition, the coolant can flow when the right side and the lower side of the first directional switching valve 212 are connected to each other, and the left side of the first directional switching valve 212 can be disconnected.

[0169] In addition, the upper side, the left side, and the right side of the third directional switching valve 215 can all be opened.

[0170] Therefore, the coolant in the heating line 230 passes through the second pump 232, the coolant heater 233, the heater core 234, the second direction switching valve 231, and the condenser 120 in sequence, flows into the second pump 232 again, and circulates. This cycle is repeated.

[0171] In this case, the coolant passes through the heater core 234 while exchanging heat with the air blown by the blower of the air conditioning device 190, so that the air is heated. The heated air is supplied to the interior of the vehicle and used to heat the interior of the vehicle.

[0172] Furthermore, the coolant in the cooling line 210 separated from the heating line 230 flows from the fourth pump 252 to the second directional switching valve 231, the electrical component 253, the second coolant connector 262, the third directional switching valve 215, the refrigerator 160, the first coolant connector 271, and the first directional switching valve 212, and then flows into the fourth pump 252 again and circulates. This cycle is repeated.

[0173] In addition, the coolant having passed through the battery 213 may circulate through the first pump 214 , flow into the third directional switching valve 215 , flow upward, and then be divided into two at the first coolant joint 271 .

[0174] In this case, the left side of the first directional switching valve 212 is blocked, and a separate coolant circulation line may be formed by the third pump 221 .

[0175] The coolant that has passed through radiator 211 can be circulated downward from third coolant junction 272 by third pump 221, thereby defining a circulation line in which the coolant passes through evaporator 140 and fifth coolant junction 290b and then flows back into radiator 211. Therefore, in evaporator 140, the coolant can absorb heat from the outside air via radiator 211. Furthermore, third pump 221 can be provided in fifth connecting line 290 to increase the flow rate in the heat-absorbing coolant path, thereby improving heating performance.

[0176] In this case, the upper and lower sides of the fifth directional switching valve 291 connected to the fifth connecting line 290 are connected, and the right side of the fifth directional switching valve 291 is blocked, thereby preventing the coolant from circulating to the cooling line 220 .

[0177] Figure 5 It shows Figure 3 A view of the operating status of the system in heating mode.

[0178] Reference Figure 5 In the refrigerant circulation line 100, the compressor 110 operates, and high-temperature, high-pressure refrigerant is discharged from the compressor 110. Furthermore, the refrigerant discharged from the compressor 110 is cooled while exchanging heat with the coolant in the condenser 120. Thereafter, the refrigerant cooled and condensed in the condenser 120 is divided in the refrigerant branch portion 101. A portion of the refrigerant passes through the refrigerant heat exchanger 180, and is then throttled and expanded while passing through the first expansion valve 130. Thereafter, the expanded refrigerant exchanges heat with the coolant in the secondary cooling line 220 while passing through the evaporator 140, and the coolant in the secondary cooling line 220 is cooled by the refrigerant.

[0179] In addition, the refrigerant evaporated in the evaporator 140 passes through the refrigerant heat exchanger 180 , exchanges heat with the refrigerant before being introduced into the first expansion valve 130 , and then flows into the compressor 110 again via the accumulator 170 .

[0180] The remaining refrigerant divided in the refrigerant branching portion 101 is throttled and expanded while passing through the second expansion valve 150. The expanded refrigerant then evaporates by exchanging heat with the coolant while passing through the refrigerator 160, thereby cooling the coolant. The refrigerant evaporated in the refrigerator 160 flows back into the compressor 110 via the accumulator 170.

[0181] As described above, the refrigerant having passed through the evaporator 140 and the refrigerant having passed through the refrigerator 160 merge with each other in the accumulator 170 and flow into the compressor 110. As the above process is repeated, the refrigerant circulates.

[0182] The coolant in the coolant circulation line 200 circulates by the operation of the second pump 232, the fourth pump 252, and the third pump 221. In addition, the coolant can be heated while passing through the condenser 120, heated by the coolant heater 233, and heated by waste heat of the electric components 253. The coolant can be cooled while passing through the refrigerator 160.

[0183] In this case, second directional switching valve 231 and first directional switching valve 212 can adjust their directions so that heating line 230 and cooling line 210 are separated. More specifically, coolant can flow when the upper and right sides of second directional switching valve 231 are connected, and coolant can flow when the lower and left sides of second directional switching valve 231 are connected. Furthermore, coolant can flow when the left and lower sides of first directional switching valve 212 are connected, and the right side of first directional switching valve 212 can be disconnected. Furthermore, the upper and left sides of third directional switching valve 215 can be connected, and the right side of third directional switching valve 215 can be blocked.

[0184] Therefore, the coolant in heating line 230 passes through second pump 232, coolant heater 233, heater core 234, second directional switching valve 231, and condenser 120 in sequence, then flows back into second pump 232 and circulates. This cycle repeats. In this case, the coolant passes through heater core 234 while exchanging heat with air blown by the blower of air conditioning unit 190, heating the air. The heated air is then supplied to the vehicle interior and used to heat the vehicle interior.

[0185] Furthermore, the coolant in cooling line 210, which is separated from heating line 230, flows from fourth pump 252 in this order to second directional switching valve 231, electrical components 253, fourth directional switching valve 261, third coolant junction 272, refrigerator 160, third directional switching valve 215, and radiator 211. The coolant that has passed through the radiator is divided at third coolant junction 272. A portion of the coolant flows through first directional switching valve 212 and into fourth pump 252. The remaining coolant flows along fifth connecting line 290, undergoes heat exchange in evaporator 140, and then flows to fifth coolant junction 254 again, where it merges with the coolant that has passed through third directional switching valve 215 and then flows to radiator 211.

[0186] In this case, the upper side and the right side of the fourth directional switching valve 261 may be connected to each other so that the coolant flows toward the refrigerator 160 . The coolant flows toward the refrigerator 160 via the third coolant joint 272 .

[0187] Thus, the electrical components 253 and the refrigerator 160 can be connected in series, and a coolant flow path capable of absorbing both external air and waste heat can be formed. In this structure, since there is no branch in the cooling line 210 circulating through the radiator 211, the electrical components 253, and the refrigerator 160, the coolant can flow at a nearly constant flow rate, which can improve heating performance.

[0188] In this case, the coolant does not flow toward the battery 213 through the first direction switching valve 212 and the third direction switching valve 215 .

[0189] Figure 6 It shows Figure 3 A view of the operating status of the system in cooling mode.

[0190] Reference Figure 6 In the refrigerant circulation line 100, the compressor 110 operates, and high-temperature, high-pressure refrigerant is discharged from the compressor 110. Furthermore, the refrigerant discharged from the compressor 110 is cooled while exchanging heat with the coolant in the condenser 120. Thereafter, the refrigerant cooled and condensed in the water-cooled condenser 120 is divided in the refrigerant branching portion 101. A portion of the refrigerant passes through the refrigerant heat exchanger 180, and is then throttled and expanded while passing through the first expansion valve 130. Thereafter, the expanded refrigerant exchanges heat with the coolant in the secondary cooling line 220 while passing through the evaporator 140, and the coolant in the secondary cooling line 220 is cooled by the refrigerant.

[0191] In addition, the refrigerant evaporated in the evaporator 140 passes through the refrigerant heat exchanger 180 , exchanges heat with the refrigerant before being introduced into the first expansion valve 130 , and then flows into the compressor 110 again via the accumulator 170 .

[0192] The remaining refrigerant split in refrigerant branching unit 101 is throttled and expanded while passing through the second expansion valve. The expanded refrigerant then evaporates through heat exchange with the coolant while passing through refrigerator 160, cooling the coolant. The refrigerant evaporated in refrigerator 160 flows back into compressor 110 via accumulator 170.

[0193] As described above, the refrigerant having passed through the evaporator 140 and the refrigerant having passed through the refrigerator 160 merge with each other in the accumulator 170 and flow into the compressor 110. As the above process is repeated, the refrigerant circulates.

[0194] Furthermore, coolant circulates in cooling line 220 through the operation of third pump 221. Furthermore, the coolant passes through cabin cooler 222, exchanging heat with air blown by the blower of air conditioning unit 190, thereby cooling the air. The cooled air is supplied to and used to cool the vehicle interior. In this case, the upper and right sides of fifth directional switching valve 291, provided in fifth connecting line 290, are connected, and the lower side of fifth directional switching valve 291 is closed, causing cooling line 220 to circulate in a closed loop.

[0195] At the same time, the coolant in the coolant circulation line 200 is circulated by the operation of the second pump 232, the fourth pump 252, and the first pump 214. In addition, the battery 213, the electric components 253, and the refrigerant passing through the condenser 120 can be cooled by the coolant. The heated coolant can be cooled while exchanging heat with the outside air by the operation of the cooling fan 211a of the radiator 211 for the electric components.

[0196] In this case, second directional switching valve 231 and first directional switching valve 212 can adjust their directions so that heating line 230 and cooling line 210 are connected. More specifically, coolant can flow when the upper and left sides of second directional switching valve 231 are connected, and coolant can flow when the lower and right sides of second directional switching valve 231 are connected. Furthermore, coolant can flow when the left and lower sides of first directional switching valve 212 are connected, and the right side of first directional switching valve 212 can be disconnected. Furthermore, the upper and right sides of third directional switching valve 215 can be connected, and the left side of third directional switching valve 215 can be blocked.

[0197] Therefore, the coolant flows from the radiator 211 to the first directional switching valve 212, the fourth pump 252, the second directional switching valve 231, the condenser 120, the second pump 232, the coolant heater 233, the heater core 234, the second directional switching valve 231, the electric component 253, and the second coolant joint 262 in this order, and then flows into the radiator 211 again and circulates. This cycle is repeated.

[0198] In this case, the right line of the fourth directional switching valve 261 may be closed, thereby preventing the coolant from flowing to the fourth connecting line 280 .

[0199] The first direction switching valve 212 may prevent the coolant from flowing from the first direction switching valve 212 to the first coolant junction 271 , and the third direction switching valve 215 may prevent the coolant from flowing from the third direction switching valve 215 to the second coolant junction 262 .

[0200] Furthermore, the coolant can flow from the refrigerator 160 to the first coolant connector 271, the first pump 214, the battery 213, and the third directional switching valve 215 in sequence, and then flow back into the refrigerator 160 and circulate. This cycle repeats. In other words, the battery 213 and the refrigerator 160 can define a separate closed loop, in which the coolant circulates in the cooling line 210 through the first directional switching valve 212 and the third directional switching valve 215, so that the battery 213 can be cooled separately.

[0201] Figures 7 to 13 A second embodiment of the present invention is shown.

[0202] Figure 7 is a structural diagram of a vehicle heat pump system according to a second embodiment of the present invention, Figure 8 It shows Figure 7 A view of the operation of the first air-conditioning mode, Figure 9 It shows Figure 7 A view of the operation of the second air-conditioning mode, Figure 10 It shows Figure 7 A view of the operation of the third air-conditioning mode, Figure 11 It shows Figure 7 A view of the operation of the fourth air-conditioning mode, Figure 12 It shows Figure 7 A view of the operation of the fifth air-conditioning mode, Figure 13 It shows Figure 1 A view of the operation of the sixth air-conditioning mode.

[0203] See also Figure 7 A vehicle heat pump system according to an embodiment of the present invention may include a refrigerant circulation line 100 configured to circulate refrigerant and cool the vehicle interior; and a coolant line 200 configured to circulate coolant, heat the vehicle interior, and cool components. Coolant line 200 may include a refrigeration line 210 and a heating line 230.

[0204] The refrigerant circulation pipeline 100 may include: a compressor 110; a water-cooled condenser 120; a refrigerant branch portion 101; a first refrigerant pipeline, which branches from the refrigerant branch portion 101 and is configured so that a first expansion valve 130 and a water-cooled evaporator 140 are disposed therein; and a second refrigerant pipeline, which branches from the refrigerant branch portion 101 and is configured so that a second expansion valve 150 and a refrigerator 160 are disposed therein.

[0205] The compressor 110 operates by receiving power from an engine (internal combustion engine) or a motor. The compressor 110 sucks in refrigerant, compresses the refrigerant into a high-temperature and high-pressure gaseous refrigerant, and then discharges the refrigerant to the water-cooled condenser 120.

[0206] The refrigerant passing through the water-cooled condenser 120 exchanges heat with the coolant in the heating line 230 and then flows to the first expansion valve 130. As described above, the coolant heated by the refrigerant passing through the water-cooled condenser 120 may be supplied to the internal heat exchanger through the coolant circulation line.

[0207] The refrigerant branching portion 101 may distribute the refrigerant flowing along the refrigerant circulation line 100 to the first refrigerant line and the second refrigerant line.

[0208] The first expansion valve 130 and the water-cooled evaporator 140 may be provided in the first refrigerant line.

[0209] The first expansion valve 130 may throttle the refrigerant introduced from the first refrigerant line, bypass the refrigerant, or block the flow of the refrigerant. The first expansion valve 130 may be disposed adjacent to the inlet of the water-cooled evaporator 140 based on the flow direction of the refrigerant.

[0210] The water-cooled evaporator 140 is provided in the first refrigerant line. The refrigerant discharged from the first expansion valve 130 is supplied to the water-cooled evaporator 140 and passes through the water-cooled evaporator 140 while exchanging heat with the coolant passing through the cooling line 220.

[0211] The second expansion valve 150 may throttle the refrigerant introduced through the second refrigerant line, perform a bypass operation on the refrigerant, or block the flow of the refrigerant. The second expansion valve 150 may be disposed on a side adjacent to the inlet of the refrigerator 160 based on the flow direction of the refrigerant.

[0212] The low-temperature, low-pressure refrigerant discharged from the second expansion valve 150 is supplied to the refrigerator 160 and performs heat exchange with the coolant flowing in the coolant line 200. The cold coolant generated by the heat exchange in the refrigerator 160 can flow along the coolant line 200 and perform heat exchange with the high-temperature battery 213. That is, the battery 213 performs heat exchange with the coolant instead of the refrigerant.

[0213] The accumulator 170 is installed on a side adjacent to the inlet of the compressor 110. Refrigerant that has passed through the evaporator and / or the refrigerator 160 is merged into the accumulator 170. The accumulator 170 can separate the refrigerant into liquid refrigerant and gaseous refrigerant and supply only the gaseous refrigerant to the compressor 110.

[0214] In addition, a refrigerant heat exchanger 180 may be provided in the refrigerant circulation line 100 .

[0215] The refrigerant heat exchanger 180 allows the refrigerant passing through the water-cooled condenser 120 and flowing toward the refrigerant branch portion 101 to exchange heat with the refrigerant discharged from the accumulator 170, thereby improving cooling performance. In this case, the inlet-side refrigerant line configured to connect the water-cooled condenser 120 and the refrigerant branch portion 101 passes through the refrigerant heat exchanger 180, and the outlet-side refrigerant line passes through the accumulator 170 and the compressor 110, so that the refrigerant passing through the inlet-side refrigerant line and the refrigerant passing through the outlet-side refrigerant line can exchange heat with each other.

[0216] Therefore, the refrigerant may be further cooled by the refrigerant heat exchanger 180 before being split by the refrigerant branch portion, thereby improving the cooling performance achieved by the evaporator and increasing the efficiency of the cooling system.

[0217] The cooling line 210 may include a radiator 211 , a first direction switching valve 212 , a battery 213 , a first pump 214 , and a third direction switching valve 215 .

[0218] The radiator 211 cools the coolant that has exchanged heat with the electric component 253 and / or the battery 213. The radiator 211 may be cooled by a cooling fan 211a in an air cooling manner.

[0219] The first directional switching valve 212 may connect the refrigerant line 210 and the cooling line 220 and control the flow of the coolant so that the refrigerant line 210 and the cooling line 220 are connected or disconnected according to an air-conditioning mode.

[0220] A four-way valve may be used as the first directional switching valve 212 . Two branch points of the first directional switching valve 212 may be connected to the cooling line 210 , and the remaining two branch points of the first directional switching valve 212 may be connected to the cooling line 220 .

[0221] In one embodiment, a binary valve may be used as the first directional switching valve 212 .

[0222] The first direction switching valve 212 may control the flow direction of the coolant based on an air-conditioning mode to be described below, thereby improving heating efficiency.

[0223] Battery 213 serves as a power source for the vehicle. Battery 213 can be used as a drive source for various types of electrical components 253 in the vehicle. Furthermore, battery 213 can be connected to a fuel cell and used to store electricity. Alternatively, battery 213 can be used to store externally supplied electricity. Battery 213 can be cooled or heated by exchanging heat with a flowing coolant.

[0224] The first pump 214 is provided in the refrigeration line 210 and is used to pump the coolant.

[0225] A third directional switching valve 215 may be provided in the refrigerant line 210, and a third connection line 270 passing through the refrigerator 160 may be connected to one side of the third directional switching valve 215. The third directional switching valve 215 may control the flow of coolant based on an air conditioning mode.

[0226] A second direction switching valve 231 , a water-cooled condenser 120 , a second pump 232 , a coolant heater 233 , and a heater core 234 may be provided in the heating line 230 .

[0227] The second direction switching valve 231 may be connected to the first connection line 250 , the second connection line 260 , and the heating line 230 , and the cooling line 210 and the heating line 230 may be connected or disconnected by the second direction switching valve 231 .

[0228] More specifically, a second directional switching valve 231 may be installed in the heating line 230. Two coolant line pipes may be connected to the second directional switching valve 231. A single first connecting line 250 branching from one side of the cooling line 210 may be connected to the second directional switching valve 231. A single second connecting line branching from the other side of the cooling line 210 may be connected to the second directional switching valve 231. In other words, four coolant lines 200 may be connected to the second directional switching valve 231 so as to converge. The first directional switching valve 212 may be a four-way directional switching valve capable of adjusting the state in which the four coolant lines 200 are connected or disconnected from each other.

[0229] The coolant passing through the water-cooled condenser 120 may perform heat exchange with the refrigerant passing through the water-cooled condenser 120 .

[0230] The second pump 232 is a device provided in the heating line 230 and configured to pump the coolant so that the coolant flows along the heating line 230 .

[0231] The coolant heater 233 is a device for heating the coolant. It is connected and positioned behind the second pump 232 and in front of the heater core 234, based on the coolant's flow direction. Furthermore, the coolant heater 233 operates when the coolant temperature is equal to or lower than a specific temperature. Various components capable of generating heat using electricity, such as an induction heater, a sheath heater, a PTC heater, or a film heater, can be used as the coolant heater 233.

[0232] Heater core 234 may be provided in the vehicle's air conditioning system. Air flowing through the blower may be heated while passing through heater core 234, supplied to the vehicle interior, and used to heat the vehicle interior. Furthermore, heater core 234 may be connected and provided behind coolant heater 233 based on the coolant flow direction.

[0233] The cabin cooler 222 is provided in the cooling line 220 and can cool the vehicle interior by using the coolant passing through the water-cooled evaporator 140. The third pump 221 and the cabin cooler 222 may be provided in the cooling line 220, and the cooling line 220 may be connected to the refrigeration line 210 through the cooling connection line 223.

[0234] The third pump 221 is a device provided in the cooling line 220 and configured to pump the coolant so that the coolant flows along the cooling line 220 .

[0235] Cabin cooler 222 functions as an air-cooled evaporator. Coolant, cooled by heat exchange with the refrigerant passing through water-cooled evaporator 140, passes through cabin cooler 222. Cabin cooler 222 is also provided in an air conditioning unit. Air flowing through cabin cooler 222 by the air conditioning unit's blower is cooled, supplied to the vehicle interior, and used to cool the vehicle interior.

[0236] The cooling connection line 223 may connect the cooling line 220 and the refrigeration line 210. The cooling connection line 223 may allow coolant to flow according to the air conditioning mode. The cooling connection line 223 may allow coolant introduced through the refrigeration line 210 to flow back into the refrigeration line 210 via the water-cooled evaporator 140 provided in the cooling line 220.

[0237] In one embodiment, one side of the cooling connection line 223 may be provided between the water-cooled evaporator 140 and the cabin cooler 222. This is to prevent the coolant flowing along the cooling line 220 from being introduced into the cabin cooler 222 when the refrigeration line 210 and the cooling line 220 are connected via the first directional switching valve 212.

[0238] The first connecting line 250 may be branched from one side of the cooling line 210 and connected to one region of the heating line 230 .

[0239] The storage tank 251 , the third pump 221 , and the electric components 253 may be provided in the first connecting line 250 .

[0240] The storage tank 251 may be used to store coolant and replenish the coolant in the coolant line.

[0241] In one embodiment, the storage tank 251 may be provided at the connection portion between the first connection line 250 and the refrigeration line 210. As described above, since the storage tank 251 is provided at the connection portion between the first connection line 250 and the refrigeration line 210, the efficiency of replenishing or storing the coolant can be improved according to the air conditioning mode regardless of the flow direction of the coolant.

[0242] The fourth pump 252 may be provided in the first connecting line 250 and pump the coolant.

[0243] The electric component 253 may be provided in the first connecting line 250. The electric component 253 may be cooled by the coolant. In addition, the electric component 253 may be a drive motor, an inverter, a charger (on-board charger (OBC)), etc.

[0244] The second connecting line 260 may be branched from the other side of the cooling line 210 and connected to one region of the heating line 230. One side of the second connecting line 260 is connected to the second direction switching valve 231 provided in the heating line 230, and the other side of the second connecting line 260 may be connected to one region of the cooling line 210.

[0245] The third connecting line 270 may branch from the first coolant joint 271 provided in the refrigeration line 210. One side of the third connecting line 270 may be connected to the refrigeration line 210, and the other side of the third connecting line 270 may be connected to the third direction switching valve 215. The coolant flowing through the third connecting line 270 may pass through the refrigerator 160.

[0246] In this case, the refrigerator 160 is as described above with reference to the refrigerant circulation line 100 .

[0247] A third directional switching valve 215 may be provided in the refrigeration line 210, and two coolant pipes are connected to the third directional switching valve 215. The third directional switching valve 215 may be a three-way directional switching valve connected to the other side of the third connection line 270.

[0248] In one embodiment, the third connection line 270 may be connected in parallel with the refrigeration line 210 in which the battery 213 is disposed.

[0249] Figure 8 It shows Figure 7 A view of the operation of the first air-conditioning mode.

[0250] See also Figure 8 , the first air-conditioning mode is a mode in which the vehicle interior is cooled and the battery 213 is cooled by the refrigerator 160 .

[0251] In the first air-conditioning mode, the compressor 110 operates in the refrigerant circulation line 100, and high-temperature and high-pressure refrigerant is discharged from the compressor 110. In addition, the refrigerant discharged from the compressor 110 is cooled while exchanging heat with the coolant in the water-cooled condenser 120. The refrigerant that has passed through the water-cooled condenser 120 passes through the refrigerant heat exchanger 180 while exchanging heat with the refrigerant that has passed through the accumulator 170.

[0252] Afterwards, the refrigerant that has passed through the refrigerant heat exchanger 180 is divided in the refrigerant branch portion 101. A portion of the refrigerant is throttled and expanded while passing through the first expansion valve 130 provided in the first refrigerant line. Afterwards, the expanded refrigerant exchanges heat with the coolant in the secondary cooling line 220 while passing through the water-cooled evaporator 140, and the coolant in the secondary cooling line 220 is cooled by the refrigerant.

[0253] In addition, the refrigerant evaporated in the water-cooled evaporator 140 is separated into gaseous refrigerant and liquid refrigerant while passing through the accumulator 170 , passes through the refrigerant heat exchanger 180 , and then flows into the compressor 110 again.

[0254] The remaining refrigerant split in refrigerant branch 101 is throttled and expanded while passing through second expansion valve 150, which is provided in the second refrigerant line. The expanded refrigerant then evaporates by exchanging heat with the coolant while passing through refrigerator 160, thereby cooling the coolant. Furthermore, the refrigerant evaporated in refrigerator 160 is separated into gaseous refrigerant while passing through accumulator 170, and then flows back into compressor 110 via refrigerant heat exchanger 180.

[0255] As described above, the refrigerant having passed through the water-cooled evaporator 140 and the refrigerant having passed through the refrigerator 160 merge with each other in the accumulator 170 and flow into the compressor 110. As the above process is repeated, the refrigerant circulates.

[0256] Meanwhile, the coolant in the coolant line 200 circulates by operations of the first pump 214 , the second pump 232 , the third pump 221 , and the fourth pump 252 .

[0257] In this case, the first directional switching valve 212 is operable to separate the refrigeration line 210 and the cooling line 220. The third directional switching valve 215 blocks the coolant line connected to the radiator 211 so that the coolant passing through the battery 213 and the refrigerator 160 defines a closed loop.

[0258] The coolant pumped by the fourth pump 252 provided in the first connecting line 250 passes through the electric component 253 , and the coolant having passed through the electric component 253 may pass through the second directional switching valve 231 .

[0259] In this case, the second directional switching valve 231 connects the first connecting line 250 to a region of the heating line 230, so that the temperature of the coolant that has passed through the electric component 253 is increased when the coolant passes through the water-cooled condenser 120. The coolant with increased temperature is pumped by the second pump 232 and flows into the second directional switching valve 231 via the coolant heater 233 and the heater core 234.

[0260] The coolant introduced into the second directional switching valve 231 after passing through the water-cooled condenser 120 flows along the second connecting line 260. The coolant may be cooled by the cooling fan 211a while passing through the radiator 211, and then be introduced again into the first directional switching valve 212. The coolant having passed through the first directional switching valve 212 may flow into the storage tank 251 and then circulate through the fourth pump 252.

[0261] The cooling line 210 and the cooling line 220 are separated by a first directional switching valve 212 .

[0262] The coolant in cooling line 220 circulates through third pump 221. Having undergone heat exchange while passing through water-cooled evaporator 140, the coolant passes through a cabin cooler. The coolant passing through cabin cooler 222 exchanges heat with air blown by the blower of air conditioning unit 190, cooling the air. The cooled air is supplied to the vehicle interior and used to cool the vehicle interior.

[0263] In addition, the third direction switching valve 215 is operable so that the third connection line 270 is connected to one area of ​​the refrigeration line 210. Therefore, the third direction switching valve 215 can prevent the coolant from flowing from the storage tank 251 to the first coolant joint 271.

[0264] The coolant flows from the refrigerator 160 and circulates sequentially through the first pump 214, the third directional switching valve 215, the first coolant connector 271, and the battery 213. This cycle repeats. In other words, the battery 213 and the refrigerator 160 define a separate closed loop through which the coolant circulates via the third directional switching valve 215, so that the battery 213 is cooled solely by the refrigerator 160.

[0265] Figure 9 It shows Figure 7 A view of the operation of the second air-conditioning mode.

[0266] See also Figure 9 , the second air-conditioning mode is a mode for cooling the vehicle interior by using the radiator 211 and cooling the battery 213 .

[0267] In the second air-conditioning mode, the compressor 110 operates in the refrigerant circulation line 100, and high-temperature and high-pressure refrigerant is discharged from the compressor 110. In addition, the refrigerant discharged from the compressor 110 is cooled while exchanging heat with the coolant in the water-cooled condenser 120. The refrigerant that has passed through the water-cooled condenser 120 passes through the refrigerant heat exchanger 180 while exchanging heat with the refrigerant that has passed through the accumulator 170.

[0268] After that, the refrigerant that has passed through the refrigerant heat exchanger 180 is divided in the refrigerant branch portion 101. A portion of the refrigerant is throttled and expanded while passing through the first expansion valve 130. After that, the expanded refrigerant exchanges heat with the coolant in the secondary cooling line 220 while passing through the water-cooled evaporator 140, and the coolant in the secondary cooling line 220 is cooled by the refrigerant.

[0269] In addition, the refrigerant evaporated in the water-cooled evaporator 140 is separated into gaseous refrigerant and liquid refrigerant while passing through the accumulator 170 , passes through the refrigerant heat exchanger 180 , flows into the compressor 110 again, and then circulates.

[0270] In this case, in the second air-conditioning mode, the refrigerator 160 is not used, and the second expansion valve 150 is closed so that the refrigerant does not flow.

[0271] Meanwhile, the coolant in the coolant line 200 circulates by operations of the first pump 214 , the second pump 232 , the third pump 221 , and the fourth pump 252 .

[0272] In this case, the first directional switching valve 212 may be operated to separate the refrigerant line 210 and the cooling line 220. The third directional switching valve 215 may close the third connecting line 270 so that the coolant passing through the battery 213 flows into the radiator 211.

[0273] The coolant pumped by the fourth pump 252 provided in the first connecting line 250 passes through the electric component 253 , and the coolant having passed through the electric component 253 may pass through the second directional switching valve 231 .

[0274] In this case, the second directional switching valve 231 connects the first connecting line 250 to a region of the heating line 230, so that the temperature of the coolant that has passed through the electric component 253 is increased when the coolant passes through the water-cooled condenser 120. The coolant with increased temperature is pumped by the second pump 232 and flows into the second directional switching valve 231 via the coolant heater 233 and the heater core 234.

[0275] The coolant introduced into the second directional switching valve 231 after passing through the water-cooled condenser 120 flows along the second connecting line 260. The coolant may be cooled by the cooling fan 211a while passing through the radiator 211, and then be introduced again into the first directional switching valve 212. The coolant having passed through the first directional switching valve 212 may flow into the storage tank 251, and then circulate through the fourth pump 252.

[0276] The coolant divided in the storage tank 251 flows along the refrigeration line 210, flows to the battery 213 via the first coolant joint 271, and flows to the third directional switching valve 215 via the second pump 232. In this case, the third directional switching valve 215 blocks the flow of the coolant to the third connecting line 270, allowing the coolant to flow into the radiator 211 and then circulate.

[0277] Therefore, the battery 213 may be cooled by the coolant circulating through the radiator 211 .

[0278] The cooling line 210 and the cooling line 220 are separated by a first directional switching valve 212 .

[0279] The coolant in cooling line 220 circulates through third pump 221. Having undergone heat exchange while passing through water-cooled evaporator 140, the coolant passes through a cabin cooler. The coolant passing through cabin cooler 222 exchanges heat with air blown by the blower of air conditioning unit 190, cooling the air. The cooled air is supplied to the vehicle interior and used to cool the vehicle interior.

[0280] Figure 10 It shows Figure 7 A view of the operation of the third air-conditioning mode.

[0281] See also Figure 10 , the third air-conditioning mode is a mode in which the interior of the vehicle is hot, the heat of the outside air is absorbed, and the temperature of the battery 213 rises.

[0282] Since the operation of the refrigerant circulation line 100 in the third air-conditioning mode is the same as that in the first air-conditioning mode, a description thereof will be omitted.

[0283] One region of the refrigeration line 210 and one region of the cooling line 220 of the coolant line may be connected by a first direction switching valve 212 .

[0284] The first directional switching valve 212 may connect the refrigerant line 210 adjacent to the radiator 211 and the cooling line 220 adjacent to the water-cooled evaporator 140 , and may operate to block the flow of coolant between the refrigerant line 210 adjacent to the reservoir and the cooling line 220 adjacent to the cabin cooler 222 .

[0285] After passing through radiator 211, coolant flows through first directional switching valve 212 to cooling line 220. After passing through the evaporator, coolant flows along cooling connecting line 223, flows into radiator 211, and circulates. This circulation of coolant allows water-cooled evaporator 140 to absorb heat from the outside air. In this case, first directional switching valve 212 blocks the flow of coolant from cooling line 220 to cabin cooler 222.

[0286] The coolant circulating through the fourth pump 252 flows into the second directional switching valve 231 via the electric component 253. In this case, the second directional switching valve 231 connects the first connecting line 250 to a region of the heating line 230, so that the temperature of the coolant that has passed through the electric component 253 is increased when the coolant passes through the water-cooled condenser 120. The coolant with increased temperature is pumped by the second pump 232 and flows into the second directional switching valve 231 via the coolant heater 233 and the heater core 234.

[0287] The coolant introduced into the second direction switching valve 231 after passing through the water-cooled condenser 120 flows along the second connecting line 260 and toward the battery 213. In this case, the third direction switching valve 215 may block the flow of the coolant to the third connecting line 270.

[0288] The coolant whose temperature is increased in the water-cooled condenser 120 may increase the temperature of the battery 213 while flowing along the cooling line 210 , flow into the storage tank 251 , and then circulate through the cooling line 210 and the heating line 230 by the fourth pump 252 .

[0289] Figure 11 It shows Figure 7 A view of the operation of the fourth air-conditioning mode.

[0290] See also Figure 11 The fourth air-conditioning mode is a mode in which the interior of the vehicle is hot, the heat of the outside air is absorbed, and the heat generated by the electric component 253 and the battery 213 is absorbed.

[0291] Since the operation of the refrigerant circulation line 100 in the fourth air-conditioning mode is the same as that in the first air-conditioning mode, a description thereof will be omitted.

[0292] One region of the refrigeration line 210 and one region of the cooling line 220 of the coolant line may be connected by a first direction switching valve 212 .

[0293] The first directional switching valve 212 may connect the refrigerant line 210 adjacent to the radiator 211 and the cooling line 220 adjacent to the water-cooled evaporator 140 , and may operate to block the flow of coolant between the refrigerant line 210 adjacent to the reservoir and the cooling line 220 adjacent to the cabin cooler 222 .

[0294] After passing through radiator 211, coolant flows through first directional switching valve 212 to cooling line 220. After passing through the evaporator, coolant flows along cooling connecting line 223, flows into radiator 211, and circulates. This circulation of coolant allows water-cooled evaporator 140 to absorb heat from the outside air. In this case, first directional switching valve 212 blocks the flow of coolant from cooling line 220 to cabin cooler 222.

[0295] The coolant circulating through the fourth pump 252 flows into the second direction switching valve 231 via the electric component 253. In this case, the second direction switching valve 231 may control the flow of the coolant so that the heating lines 230 are independently circulated.

[0296] The coolant having passed through the electric component 253 flows toward the battery 213 along the second connecting line 260. In this case, the third direction switching valve 215 may open the third connecting line 270 so that the coolant may flow toward the refrigerator 160.

[0297] The coolant flowing along the third connecting line 270 may be cooled by heat exchange in the refrigerator 160 , divided in the first coolant joint 271 , and then moved.

[0298] The coolant circulating toward the storage tank 251 may absorb heat from the electric components 253 , and the coolant circulating toward the battery 213 may absorb heat from the battery 213 .

[0299] The coolant in the heating line 230 absorbs heat from the water-cooled condenser 120. The coolant passing through the water-cooled condenser heats the vehicle interior while passing through the second pump 232, the coolant heater 233, and the heater core 234, defining a closed loop circulating through the second directional switching valve 231.

[0300] Figure 12 It shows Figure 7 A view of the operation of the fifth air-conditioning mode.

[0301] See also Figure 12 , the fifth air-conditioning mode is a mode in which the interior of the vehicle is heated and dehumidified and absorbs heat from the outside air, the electric components 253 and the battery.

[0302] Since the operation of the refrigerant circulation line 100 in the fifth air-conditioning mode is the same as that in the first air-conditioning mode, a description thereof will be omitted.

[0303] Meanwhile, the coolant in the coolant line 200 circulates by operations of the first pump 214 , the second pump 232 , the third pump 221 , and the fourth pump 252 .

[0304] The first directional switching valve 212 is operable to separate the refrigerant line 210 and the cooling line 220 .

[0305] The coolant pumped by the fourth pump 252 provided in the first connecting line 250 passes through the electric component 253 , and the coolant having passed through the electric component 253 may pass through the second directional switching valve 231 .

[0306] The coolant circulating through the fourth pump 252 flows into the second direction switching valve 231 via the electric component 253. In this case, the second direction switching valve 231 may control the flow of the coolant so that the heating lines 230 are independently circulated.

[0307] The coolant having passed through the electric component 253 flows along the second connecting line 260 and flows by being divided in an area where the second connecting line 260 intersects the refrigeration line 210 .

[0308] The coolant flowing from the second connection line 260 toward the battery 213 flows into the third direction switching valve 215. The third direction switching valve 215 may open the third connection line 270 so that the coolant may flow toward the refrigerator 160.

[0309] The coolant flowing along the third connecting line 270 may be cooled by heat exchange in the refrigerator 160 , divided in the first coolant joint 271 , and then moved.

[0310] The coolant divided in the first coolant joint 271 and circulated toward the storage tank 251 may absorb heat from the electric components 253 while circulating through the first pump 214 .

[0311] In addition, the coolant divided in the first coolant joint 271 and circulated toward the battery 213 may absorb heat of the battery 213 and then flow toward the third direction switching valve 215 .

[0312] The coolant divided in the second connecting line 260 and circulated toward the radiator 211 is cooled by the cooling fan 211 a while passing through the radiator 211 , passes through the first direction switching valve 212 , and then flows into the reservoir 251 .

[0313] The coolant in the cooling line 220 circulates through the third pump 221 and passes through the cabin cooler 222. The coolant passing through the cabin cooler 222 exchanges heat with air blown by the blower of the air conditioning device, and when the coolant and the air exchange heat with each other, moisture in the air is removed.

[0314] At the same time, the coolant in the heating line 230 absorbs heat from the water-cooled condenser 120. The coolant passing through the water-cooled condenser 120 heats the vehicle interior while passing through the second pump 232, the coolant heater 233, and the heater core 234, defining a closed loop circulating through the second directional switching valve 231.

[0315] Figure 13 It shows Figure 7 A view of the operation of the sixth air-conditioning mode.

[0316] See also Figure 13 , the sixth air-conditioning mode is a mode for heating the interior of the vehicle by using waste heat.

[0317] In the sixth air-conditioning mode, the operation of the refrigerant circulation line 100 is stopped.

[0318] One region of the refrigerant line 210 and one region of the cooling line 220 of the coolant line 200 may be connected via a first directional switching valve 212. The first directional switching valve 212 may connect the refrigerant line 210 adjacent to the radiator 211 and the cooling line 220 adjacent to the water-cooled evaporator 140, and operate to block the flow of coolant between the refrigerant line 210 adjacent to the reservoir and the cooling line 220 adjacent to the cabin cooler 222. However, since the third pump 221 is not operating, the operation of the coolant line 200 connected via the first directional switching valve 212 may be stopped.

[0319] The coolant circulating through the fourth pump 252 flows into the second directional switching valve 231 via the electric component 253. In this case, the second directional switching valve 231 connects the first connecting line 250 and one area of ​​the heating line 230 so that the coolant that has passed through the electric component 253 passes through the water-cooled condenser 120.

[0320] However, since the refrigerant circulation line 100 does not operate, the coolant passes through the water-cooled condenser 120 , and the coolant is pumped by the second pump 232 and flows into the second direction switching valve 231 via the coolant heater 233 and the heater core 234 .

[0321] The coolant introduced into the second direction switching valve 231 after passing through the water-cooled condenser 120 flows along the second connecting line 260 and toward the battery 213. In this case, the third direction switching valve 215 may block the flow of the coolant to the third connecting line 270.

[0322] The coolant having passed through the third direction switching valve 215 flows along the cooling line 210 and absorbs heat from the battery 213. The coolant may flow into the storage tank 251 and then circulate through the cooling line 210 and the heating line 230 by the fourth pump 252.

[0323] In this case, since the refrigerant circulation line 100 is stopped, the coolant heats the vehicle interior by using waste heat of the electric components 253 and the battery 213 .

[0324] Figures 14 to 20 A vehicle heat pump system according to a third embodiment of the present invention is disclosed.

[0325] Figure 14 FIG is a structural diagram of a vehicle heat pump system according to a third embodiment of the present invention. Figure 14 , the vehicle heat pump system according to the present invention is different from the vehicle heat pump system according to the above-described embodiment in terms of arrangement structures of the battery 213 and the pump.

[0326] Since the refrigerant circulation line 100 of the vehicle heat pump system according to still another embodiment of the present invention is identical in structure to the above-described refrigerant circulation line 100 , a description thereof will be omitted.

[0327] Since the coolant line is also identical in structure to the above-described coolant line, only the differences will be described.

[0328] The fourth pump 252 provided in the first connecting line 250 may be omitted depending on the operation of the system.

[0329] The battery 213 and the first pump 214 provided in the refrigeration line 210 in the above embodiment may be provided in the third connection line 270 .

[0330] The battery 213 , the refrigerator 160 , and the first pump 214 may be provided in a third connecting line 270 , and a fourth connecting line 280 may be provided between the battery 213 and the refrigerator 160 .

[0331] One side of the fourth connecting line 280 may be provided in the second connecting line 260 , and the other side of the fourth connecting line 280 may be provided in the third connecting line 270 .

[0332] The fourth directional switching valve 261 may be provided in an area where the fourth connecting line 280 and the second connecting line 260 are connected. The second connecting line 260 may be connected to both opposite sides of the fourth directional switching valve 261, and the fourth connecting line 280 may be provided in one area of ​​the fourth directional switching valve 261.

[0333] In addition, the battery 213 may be provided on the upper side of the third connecting line 270, and the first pump 214 and the refrigerator 160 may be provided on the lower side of the third connecting line 270. Figure 14 The structural differences are shown to describe the operation of the system according to the air-conditioning mode.

[0334] Since the refrigerant circulation line 100 of the air conditioning mode of the vehicle heat pump system according to another embodiment of the present invention is the same as the above refrigerant circulation line, the following description will be based on the coolant line.

[0335] Figure 15 It shows Figure 14 A view of the operation of the first air-conditioning mode.

[0336] See also Figure 15 In the first air-conditioning mode, the coolant line 200 operates in the same manner as in the above embodiment. In this case, the fourth directional switching valve 261 closes the fourth connecting line 280, thereby performing the same operation as that of the coolant line 200 of the vehicle heat pump system according to the above embodiment.

[0337] Figure 16 It shows Figure 14 A view of the operation of the second air-conditioning mode.

[0338] Reference Figure 16 , the coolant in the coolant line 200 circulates by the operations of the first pump 214 , the second pump 232 , the third pump 221 , and the fourth pump 252 .

[0339] In this case, the first directional switching valve 212 may be operated to separate the refrigeration line 210 and the cooling line 220. The third directional switching valve 215 may be operated to connect the third connection line 270 and close one area of ​​the refrigeration line 210.

[0340] The coolant that has passed through the electric component 253 provided in the first connecting line 250 may pass through the second directional switching valve 231 .

[0341] In this case, the second directional switching valve 231 connects the first connecting line 250 to a region of the heating line 230, so that the temperature of the coolant that has passed through the electric component 253 is increased when the coolant passes through the water-cooled condenser 120. The coolant with increased temperature is pumped by the second pump 232 and flows into the second directional switching valve 231 via the coolant heater 233 and the heater core 234.

[0342] The coolant introduced into the second directional switching valve 231 after passing through the water-cooled condenser 120 flows along the second connecting line 260. The coolant may be cooled by the cooling fan 211a while passing through the radiator 211, and then be introduced again into the first directional switching valve 212. The coolant having passed through the first directional switching valve 212 may flow into the storage tank 251 and then circulate.

[0343] The coolant divided in the storage tank 251 flows along the refrigeration line 210. In this case, the coolant can flow through the third directional switching valve 215 and the first coolant joint 271 along the third connecting line 270, flow through the battery 213, the refrigerator 160 and the first pump 214 provided in the third connecting line 270, and then flow to the radiator 211 along the refrigeration line 210.

[0344] In this case, the second refrigerant line of the refrigerant circulation line 100 does not operate. Therefore, the refrigerator 160 does not operate, the coolant passes through the refrigerator 160 , and the battery 213 is cooled by the radiator 211 .

[0345] Meanwhile, the coolant in cooling line 220 circulates through third pump 221. Having undergone heat exchange while passing through water-cooled evaporator 140, the coolant passes through a cabin cooler. The coolant passing through cabin cooler 222 exchanges heat with air blown by the blower of air conditioning unit 190, cooling the air. The cooled air is supplied to the vehicle interior and used to cool the vehicle interior.

[0346] Figure 17 It shows Figure 14 A view of the operation of the third air-conditioning mode.

[0347] Reference Figure 17 In the third air-conditioning mode, one region of the refrigeration line 210 and one region of the cooling line 220 of the coolant line 200 may be connected through the first direction switching valve 212 .

[0348] The first directional switching valve 212 may connect the refrigerant line 210 adjacent to the radiator 211 and the cooling line 220 adjacent to the water-cooled evaporator 140 , and may operate to block the flow of coolant between the refrigerant line 210 adjacent to the reservoir and the cooling line 220 adjacent to the cabin cooler 222 .

[0349] The coolant that has passed through radiator 211 flows to cooling line 220 via first directional switching valve 212. The coolant that has passed through the evaporator flows along cooling connecting line 223, flows into radiator 211, and circulates. The circulating coolant absorbs heat from the outside air through water-cooled evaporator 140. In this case, first directional switching valve 212 may block the flow of coolant from cooling line 220 to cabin cooler 222.

[0350] The coolant flows into the second directional switching valve 231 via the electric component 253. In this case, the second directional switching valve 231 connects the first connecting line 250 to a region of the heating line 230, so that when the coolant passes through the water-cooled condenser 120, the temperature of the coolant that has passed through the electric component 253 is increased. The coolant with increased temperature is pumped by the second pump 232 and flows into the second directional switching valve 231 via the coolant heater 233 and the heater core 234.

[0351] The coolant introduced into the second directional switching valve 231 after passing through the water-cooled condenser 120 flows along the second connecting line 260 .

[0352] In this case, the fourth directional switching valve 261 operates to connect the fourth connecting line 280 and the second connecting line 260 so that the coolant flows along the fourth line. The third directional switching valve 215 blocks the flow in the cooling line 210 so that the coolant flows to the battery 213.

[0353] The coolant whose temperature is increased in the water-cooled condenser 120 may flow to the battery 213 in the third connecting line 270 through the fourth directional switching valve 261 , increase the temperature of the battery 213 , flow into the storage tank 251 , and then circulate through the refrigeration line 210 and the heating line 230 .

[0354] In the above structure, when the temperature of the battery 213 increases, the coolant may bypass the first pump 214 , thereby preventing reverse rotation of the first pump 214 .

[0355] Figure 18 It shows Figure 14 A view of the operation of the fourth air-conditioning mode.

[0356] Reference Figure 18 In the fourth air-conditioning mode, one region of the refrigeration line 210 and one region of the cooling line 220 of the coolant line 200 may be connected through the first direction switching valve 212 .

[0357] The first directional switching valve 212 may connect the refrigerant line 210 adjacent to the radiator 211 and the cooling line 220 adjacent to the water-cooled evaporator 140 , and operate to block the flow of coolant between the refrigerant line 210 adjacent to the reservoir and the cooling line 220 adjacent to the cabin cooler 222 .

[0358] After passing through radiator 211, coolant flows through first directional switching valve 212 to cooling line 220. After passing through the evaporator, coolant flows along cooling connecting line 223, flows into radiator 211, and circulates. This circulation of coolant allows water-cooled evaporator 140 to absorb heat from the outside air. In this case, first directional switching valve 212 blocks the flow of coolant from cooling line 220 to cabin cooler 222.

[0359] The coolant that has passed through the electric components 253 provided in the first connecting line 250 flows into the second directional switching valve 231. In this case, the second directional switching valve 231 connects the first connecting line 250 to a region of the heating line 230 so that the temperature of the coolant that has passed through the electric components 253 is increased when the coolant passes through the water-cooled condenser 120. The coolant with increased temperature is pumped by the second pump 232 and flows into the second directional switching valve 231 via the coolant heater 233 and the heater core 234.

[0360] The coolant introduced into the second directional switching valve 231 after passing through the water-cooled condenser 120 flows along the second connecting line 260 .

[0361] In this case, the fourth directional switching valve 261 operates so that the fourth connecting line 280 and the second connecting line 260 are connected, so that the coolant flows along the fourth connecting line 280 and is divided in the third connecting line 270 .

[0362] The coolant divided into the battery 213 in the third connecting line 270 passes through the battery 213 , flows into the storage tank 251 , and then circulates.

[0363] The coolant divided into the refrigerator 160 in the third connecting line 270 undergoes heat exchange in the refrigerator 160 , flows along the cooling line 210 via the first pump 214 and the third direction switching valve 215 , and flows into the storage tank 251 .

[0364] The coolant flowing along the coolant line 200 may absorb waste heat from the electric components 253 and the battery 213 .

[0365] Figure 19 It shows Figure 14 A view of the operation of the fifth air-conditioning mode.

[0366] Reference Figure 19 In the fifth air-conditioning mode, the coolant in the coolant line 200 circulates by the operations of the first pump 214 , the second pump 232 , the third pump 221 , and the fourth pump 252 .

[0367] The first directional switching valve 212 is operable to separate the refrigerant line 210 and the cooling line 220 .

[0368] The coolant may pass through the electric component 253 provided in the first connecting line 250 . The coolant having passed through the electric component 253 may pass through the second direction switching valve 231 .

[0369] In this case, the second directional switching valve 231 may control the flow of the coolant so that the heating line 230 circulates independently.

[0370] The coolant passing through the electric component 253 may flow along the second connecting line 260 and pass through the fourth directional switching valve 261 .

[0371] In this case, the fourth directional switching valve 261 operates so that the fourth connecting line 280 and the second connecting line 260 are connected, so that the coolant flows along the fourth connecting line 280 and is divided in the third connecting line 270 .

[0372] The coolant divided into the battery 213 in the third connecting line 270 passes through the battery 213 , flows into the storage tank 251 , and then circulates.

[0373] The coolant divided into the refrigerator 160 in the third connecting line 270 performs heat exchange in the refrigerator 160, flows along the refrigerant line 210 via the first pump 214 and the third directional switching valve 215, and flows toward the radiator 211. The coolant flowing toward the radiator 211 may be cooled by the cooling fan 211a and flows into the storage tank 251 via the first directional switching valve 212.

[0374] The coolant in the cooling line 220 circulates through the third pump 221 and passes through the cabin cooler 222. The coolant passing through the cabin cooler 222 exchanges heat with air blown by the blower of the air conditioning device, and when the coolant and the air exchange heat with each other, moisture in the air is removed.

[0375] At the same time, the coolant in the heating line 230 absorbs heat from the water-cooled condenser 120. The coolant passing through the water-cooled condenser 120 heats the vehicle interior while passing through the second pump 232, the coolant heater 233, and the heater core 234, defining a closed loop circulating through the second directional switching valve 231.

[0376] Figure 20 It shows Figure 14 A view of the operation of the sixth air-conditioning mode.

[0377] Reference Figure 20 , in the sixth air-conditioning mode, the operation of the refrigerant circulation line 100 is stopped.

[0378] One region of the refrigerant line 210 and one region of the cooling line 220 of the coolant line 200 may be connected via a first directional switching valve 212. The first directional switching valve 212 may connect the refrigerant line 210 adjacent to the radiator 211 and the cooling line 220 adjacent to the water-cooled evaporator 140, and operate to block the flow of coolant between the refrigerant line 210 adjacent to the reservoir and the cooling line 220 adjacent to the cabin cooler 222. However, since the third pump 221 is not operating, the operation of the coolant line 200 connected via the first directional switching valve 212 may be stopped.

[0379] The coolant that has passed through the electric component 253 provided in the first connecting line 250 flows into the second directional switching valve 231. In this case, the second directional switching valve 231 connects the first connecting line 250 and one area of ​​the heating line 230 so that the coolant that has passed through the electric component 253 passes through the water-cooled condenser 120.

[0380] However, since the refrigerant circulation line 100 does not operate, the coolant passes through the water-cooled condenser 120 , and the coolant is pumped by the second pump 232 and flows into the second direction switching valve 231 via the coolant heater 233 and the heater core 234 .

[0381] The coolant introduced into the second directional switching valve 231 after passing through the water-cooled condenser 120 flows along the second connecting line 260 .

[0382] In this case, the fourth directional switching valve 261 is operated to connect the fourth connecting line 280 and the second connecting line 260, so that the coolant flows along the fourth connecting line 280. In this case, the third directional switching valve 215 can block the flow of the coolant in the refrigeration line 210. Therefore, the coolant flowing along the third connecting line 270 passes through the battery 213 and then flows from the first coolant joint 271 to the storage tank 251.

[0383] In this case, since the refrigerant circulation line 100 is stopped, the coolant heats the vehicle interior by using waste heat of the electric components 253 and the battery 213 .

[0384] Components denoted by the same reference numerals in the description of the vehicle heat pump system according to the embodiment of the present invention may perform the same function, and configurations and contents related to the embodiment may be implemented interchangeably.

[0385] Figures 21 to 25 A fourth embodiment of the present invention relates to a vehicle heat pump system.

[0386] Figure 21 FIG4 is a structural diagram of a vehicle heat pump system according to a fourth embodiment of the present invention.

[0387] See also Figure 21 The vehicle heat pump system according to the fourth embodiment of the present invention may include: a compressor 110 configured to compress and circulate refrigerant; a first heat exchanger (condenser 120) configured to condense the compressed refrigerant; a first expansion valve 130 configured to expand the condensed refrigerant; a second heat exchanger (evaporator 140) configured to evaporate the refrigerant expanded by the first expansion valve 130; a second expansion valve 150 configured to expand the condensed refrigerant; a refrigerator 160 configured to allow the coolant to exchange heat with the refrigerant expanded by the second expansion valve 150; a heat dissipation heat exchanger (radiator 211) configured to allow the coolant to exchange heat with the outside air; and an electrical component 253 configured to be cooled by the coolant. In heating mode, the coolant that has passed through the heat dissipation heat exchanger (radiator 211) can exchange heat with the electrical component 253 and then flow into the refrigerator 160, thereby improving heating performance.

[0388] Hereinafter, the condenser 120 will be described as an example of a first heat exchanger, the evaporator 140 will be described as an example of a second heat exchanger, the radiator 211 will be described as an example of a heat-dissipating heat exchanger, and the battery 213 will be described as an example of a heat-generating component.

[0389] A vehicle heat pump system according to an embodiment of the present invention may include a refrigerant circulation line 100 configured to circulate refrigerant and cool the vehicle interior, and a coolant circulation line 200 configured to circulate coolant, heat the vehicle interior, and cool components. Coolant circulation line 200 may include a heating line 230 configured to heat the vehicle interior and a cooling line 210 configured to cool electrical components 253 and a battery 213.

[0390] The refrigerant circulation line 100 may include: a compressor 110; a condenser 120; a refrigerant branching portion 101; a first refrigerant line 100a that branches from the refrigerant branching portion 101 toward one side and is configured to pass through a first expansion valve and an evaporator 140; a second refrigerant line 100b that branches from the refrigerant branching portion 101 toward the other side and is configured to pass through a second expansion valve 150 and a refrigerator 160; and an accumulator 170, through which the refrigerant that has passed through the first and second refrigerant lines 100a, 100b passes. The refrigerant that has passed through the accumulator 170 flows back into the compressor 110, thereby completing the refrigerant circulation.

[0391] In this case, the refrigerant heat exchanger 180 may be provided in the first refrigerant line 100a. The refrigerant heat exchanger may be provided between the refrigerant branch portion 101 and the first expansion valve 130 so that the refrigerant introduced into the first expansion valve 130 can exchange heat with the refrigerant having passed through the evaporator 140.

[0392] The compressor 110 operates by receiving power from an engine (internal combustion engine) or a motor, sucks in refrigerant, compresses the refrigerant into a high-temperature and high-pressure gaseous refrigerant, and then discharges the refrigerant to the condenser 120 .

[0393] Condenser 120 functions as a condenser in both cooling mode and heating mode. Refrigerant flowing through condenser 120 exchanges heat with coolant in coolant circulation line 200, which will be described below, and then flows to first expansion valve 130. As described above, coolant heated by the refrigerant in condenser 120 can be supplied to the internal heat exchanger via coolant circulation line 200. In one embodiment, a water-cooled condenser 120 may be used as condenser 120.

[0394] The refrigerant branching portion 101 distributes the refrigerant to the first refrigerant line 100 a and the second refrigerant line 100 b .

[0395] A first expansion valve 130 and an evaporator 140 may be provided in the first refrigerant line 100 a .

[0396] The first expansion valve 130 may throttle the refrigerant introduced from the first refrigerant line 100a, perform a bypass operation on the refrigerant, or block the flow of the refrigerant. The first expansion valve 130 may be disposed at a side adjacent to the inlet of the evaporator 140 based on the flow direction of the refrigerant.

[0397] The evaporator 140 is installed in the air conditioning housing and is provided in the first refrigerant line 100a. As the refrigerant discharged from the first expansion valve 130 is supplied to the evaporator 140 and the air flowing in the air conditioning housing by the blower passes through the evaporator 140, the air exchanges heat with the low-temperature, low-pressure refrigerant in the evaporator 140 and is converted into cool air. The cool air is discharged into the vehicle interior and cools the passenger compartment.

[0398] The second expansion valve 150 and the refrigerator 160 may be provided in the second refrigerant line 100 b .

[0399] The second expansion valve 150 may throttle the refrigerant introduced from the second refrigerant line 100b, perform a bypass operation on the refrigerant, or block the flow of the refrigerant. The second expansion valve may be provided on a side adjacent to the inlet of the refrigerator 160 based on the flow direction of the refrigerant.

[0400] The low-temperature, low-pressure refrigerant discharged from the second expansion valve 150 is supplied to the refrigerator 160 and performs heat exchange with the coolant flowing in the coolant circulation line 200. The cold coolant generated by the heat exchange in the refrigerator 160 can circulate through the coolant circulation line 200 and perform heat exchange with the high-temperature battery 213. That is, the battery 213 performs heat exchange with the coolant instead of the refrigerant.

[0401] The accumulator 170 is installed on a side adjacent to the inlet of the compressor 110. The refrigerant that has passed through the evaporator 140 and / or the refrigerator 160 is merged into the accumulator 170. The accumulator 170 can separate the refrigerant into liquid refrigerant and gaseous refrigerant and supply only the gaseous refrigerant to the compressor 110.

[0402] The refrigerant heat exchanger 180 allows the refrigerant introduced into the first expansion valve 130 and the refrigerant discharged from the evaporator 140 to exchange heat with each other, thereby improving the cooling performance. In this case, the inlet-side refrigerant pipeline is configured to connect the refrigerant branch portion 101 and the first expansion valve 130, and is configured so that the refrigerant introduced into the evaporator 140 therethrough passes through the refrigerant heat exchanger 180, and the outlet-side refrigerant pipeline is configured to connect the evaporator 140 and the accumulator 170, and is configured so that the refrigerant discharged from the evaporator 140 therethrough passes through the refrigerant heat exchanger 180, so that the refrigerant passing through the inlet-side refrigerant pipeline and the refrigerant passing through the outlet-side refrigerant pipeline can exchange heat with each other.

[0403] Therefore, before the refrigerant is introduced into the first expansion valve 130, the refrigerant can be further cooled by the refrigerant heat exchanger 180, thereby improving the cooling performance achieved by the evaporator 140 and increasing the efficiency of the cooling system. In particular, the refrigerant heat exchanger 180 and the refrigerator 160 are connected in parallel.

[0404] That is, refrigerant heat exchanger 180 is not arranged in series between condenser 120 and refrigerator 160 in the refrigerant line. Instead, refrigerant heat exchanger 180 is arranged adjacent to evaporator 140, allowing refrigerant heat exchanger 180 and evaporator 140 to be arranged and connected in series. If the refrigerant heat exchanger is arranged in series between water-cooled condenser 120 and refrigerator 160, heating performance may be reduced due to the pressure drop on the low-pressure side in heating mode. In contrast, when the refrigerant heat exchangers are connected in parallel, both cooling and heating performance are improved. This is because there is no refrigerant heat exchanger between condenser 120 and refrigerator 160 in the flow of refrigerant in heating mode.

[0405] The coolant circulation line 200 may include a heating line 230 configured to heat the vehicle interior, and a cooling line 210 and a second cooling line configured to cool the electric component 253 and the battery 213 .

[0406] In this case, the cooling line 220 may include the evaporator 140, the cabin cooler 222, and the third pump 221. In this case, the coolant line connecting the evaporator 140, the cabin cooler 222, and the third pump 221 may define a closed loop.

[0407] As described above, the refrigerant and the coolant may exchange heat with each other while passing through the evaporator 140 .

[0408] Cabin cooler 222 serves as air-cooled evaporator 140. Coolant cooled by heat exchange with the refrigerant passing through evaporator 140 passes through cabin cooler 222. Cabin cooler 222 is provided in air conditioning unit 190. Air flowing from a blower of air conditioning unit 190 is cooled while passing through cabin cooler 222, supplied to the vehicle interior, and used to cool the vehicle interior.

[0409] The third pump 221 is used to pump the coolant so that the coolant circulates along the cooling line 220. In addition, the third pump 221 may be installed in the coolant line and disposed between the evaporator 140 and the cabin cooler 222. The operation of the third pump 221 may circulate the coolant.

[0410] Therefore, the vehicle heat pump system according to the present invention employs cooling line 220, which uses a coolant to cool the vehicle interior, allowing the refrigerant circulation line 100, through which the refrigerant circulates, to be located outside the vehicle interior rather than within the vehicle interior. This reduces the length of the refrigerant pipe, reduces the amount of refrigerant, and modularizes the components in refrigerant circulation line 100. Furthermore, a highly efficient natural refrigerant can be used as the refrigerant for refrigerant circulation line 100, which improves the efficiency of the thermal management system.

[0411] The heating line 230 may include the condenser 120 , a second pump 232 , a coolant heater 233 , a heater core 234 , and a second direction switching valve 231 .

[0412] As described above, the refrigerant and the coolant may exchange heat with each other while passing through the condenser 120 .

[0413] The second pump 232 is a device for pumping the coolant so that the coolant circulates along the heating line 230. The second pump 232 may be installed in the coolant line and disposed rearward of the condenser 120 based on a flow direction of the coolant.

[0414] The coolant heater 233 is a device for heating the coolant. It is connected and positioned behind the second pump 232 and in front of the heater core 234, based on the coolant's flow direction. Furthermore, the coolant heater 233 operates when the coolant temperature is equal to or lower than a specific temperature. Various components capable of generating heat using electricity, such as an induction heater, a sheath heater, a PTC heater, or a film heater, can be used as the coolant heater 233.

[0415] Heater core 234 may be provided in the vehicle's air conditioning unit 190. Air flowing from the blower may be heated while passing through heater core 234, supplied to the vehicle interior, and used to heat the vehicle interior. Furthermore, heater core 234 may be connected and provided behind coolant heater 233 based on the flow direction of the coolant.

[0416] The second directional switching valve 231 may be installed between the heater core 234 and the condenser 120 and configured to selectively connect or disconnect the heating line 230 and the cooling line 210 , as described below.

[0417] More specifically, a second directional switching valve 231 may be installed in the heating line 230. Two coolant lines may be connected to the second directional switching valve 231. A single first connecting line 250 branching from one side of the cooling line 210 may be connected to the second directional switching valve 231. A single second connecting line 260 branching from the other side of the cooling line 210 may be connected to the second directional switching valve 231. In other words, four coolant lines may be connected to the second directional switching valve 231 so as to converge. The second directional switching valve 231 may be a four-way directional switching valve capable of adjusting the state in which the four coolant lines are connected or disconnected from each other.

[0418] The cooling line 210 may include a radiator 211 , a first directional switching valve 212 , a fourth pump 252 , a second directional switching valve 231 , an electrical component 253 , a first coolant joint 271 , a second coolant joint 262 , a first pump 214 , a battery 213 , a refrigerator 160 , and a third directional switching valve 215 .

[0419] The radiator 211 cools the coolant that has exchanged heat with the electric component 253 or the battery 213. The radiator 211 may be cooled by a cooling fan 211a in an air cooling manner.

[0420] The first directional switching valve 212 may be installed in the cooling line 210. Two coolant pipes may be connected to the first directional switching valve 212. The second directional switching valve 231 and the first directional switching valve 212 may be connected by a first connecting line 250, so that the heating line 230 and the cooling line 210 are connected.

[0421] That is, the three coolant lines may be connected to the first directional switching valve 212 so as to be merged together. The first directional switching valve 212 may be a three-way directional switching valve capable of adjusting a state in which the three coolant lines are connected or disconnected from each other.

[0422] The fourth pump 252 is a device for pumping the coolant so that the coolant circulates along the refrigeration line 210. In addition, the fourth pump 252 is installed in the first connecting line 250 and is provided between the second directional switching valve 231 and the first directional switching valve 212. The operation of the fourth pump 252 can allow the coolant to flow from the first directional switching valve 212 to the second directional switching valve 231.

[0423] The second directional switching valve 231 is as described above with reference to the heating line 230 .

[0424] The electrical component 253 is provided in the second connecting line 260 connecting the second directional switching valve 231 and the second coolant joint 262. The electrical component 253 can be cooled by the coolant. In addition, the electrical component 253 can be a drive motor, an inverter, a charger (on-board charger (OBC)), etc.

[0425] The first pump 214 is a device for pumping coolant so that the coolant circulates along the refrigeration line 210. In addition, the first pump 214 is installed in the coolant line and is provided between the first coolant joint 271 and the battery 213 so that the coolant can flow from the first pump 214 to the battery 213.

[0426] Battery 213 serves as the vehicle's power source. It can be used as a drive source for various electrical components 253 in the vehicle. Furthermore, battery 213 can be connected to a fuel cell and used to store electricity. Alternatively, battery 213 can be used to store externally supplied electricity. Furthermore, battery 213 can be positioned in the coolant line between first pump 214 and third directional switching valve 215. This allows battery 213 to be cooled or heated by exchanging heat with the flowing coolant.

[0427] First coolant joint 271 is installed in the coolant line and is located behind first directional switching valve 212 based on the coolant flow direction. Three coolant lines are connected to first coolant joint 271 so as to converge. That is, first coolant joint 271 can be installed so that its two opposing sides are connected to refrigeration line 210, and third connecting line 270 can be connected to the lower side of first coolant joint 271. In this case, third connecting line 270 can be connected so as to pass through refrigerator 160.

[0428] The second coolant joint 262 may be installed at the point where the rear end of the second connecting line 260 intersects the refrigeration line 210. The three coolant lines are connected to the second coolant joint 262 so as to converge together. That is, the second coolant joint 262 may be installed so that its two opposite sides are connected to the refrigeration line 210, and the second connecting line 260 may be connected to the upper side of the second coolant joint 262.

[0429] Chiller 160 is as described above with reference to heating line 230 .

[0430] A third directional switching valve 215 may be installed in the coolant line and disposed between the battery 213 and the second coolant connector 262. Two coolant pipes may be connected to the third directional switching valve 215. A third connecting line 270 may be connected to the upper side of the third directional switching valve 215, allowing the battery 213 and the third connecting line 270 to be connected in parallel. In this case, the first directional switching valve 212 may be a three-way directional switching valve capable of adjusting the connection or disconnection state of the three coolant lines.

[0431] In addition, a blower may be installed on one side of the air conditioning unit 190 to blow air. A temperature adjustment door may be installed in the air conditioning unit 190. In addition, the evaporator 140 and the heater core 234 provided in the air conditioning unit 190 may be provided and configured so that, based on the operation of the temperature adjustment door, air discharged from the blower may flow into the vehicle interior while passing only through the evaporator 140, or may flow into the vehicle interior while passing through the evaporator 140 and then through the heater core 234.

[0432] In addition, a fourth directional switching valve 261 may be provided in the second connecting line 260 and controls the flow direction of the coolant having passed through the electric component 253. The fourth directional switching valve 261 is provided in a fourth connecting line 280 branched from the second connecting line 260. The fourth connecting line 280 may be connected to a third coolant joint 272 provided in the third connecting line 270.

[0433] The third coolant joint 272 is provided at a side adjacent to the inlet of the refrigerator 160 through which the coolant is introduced. The coolant having passed through the electric component 253 may be introduced into the refrigerator 160 according to the operation of the fourth directional switching valve 261.

[0434] In one embodiment, when the upper side and the right side of the fourth directional switching valve 261 are connected, the electrical component 253 and the refrigerator 160 may be connected in series.

[0435] Figure 22 It shows Figure 21 FIG. 1 is a view of a first embodiment of the present invention.

[0436] Reference Figure 22 , Figure 22 The illustrated vehicle heat pump system has a structure in which the first coolant connection 271 and the third coolant connection 272 are connected as a single component.

[0437] The integrated coolant joint 273 configured by connecting the first coolant joint 271 and the third coolant joint 272 may be connected to four coolant flow paths.

[0438] The integrated coolant joint 273 can be connected to the refrigerator 160, the first pump 214, the first directional switching valve 212, and the fourth connecting line 280 connected to the fourth directional switching valve 261. The flow path of the integrated coolant joint 273 can be controlled by the first directional switching valve 212, the third directional switching valve 215, and the fourth directional switching valve 261.

[0439] Figure 23 is a view showing an operating state of the system in a maximum heating mode.

[0440] Reference Figure 23 In the refrigerant circulation line 100, the compressor 110 operates, and high-temperature, high-pressure refrigerant is discharged from the compressor 110. Furthermore, the refrigerant discharged from the compressor 110 is cooled while exchanging heat with the coolant in the condenser 120. Thereafter, the refrigerant cooled in the condenser 120 passes through the refrigerant branch portion 101, and is throttled and expanded while passing through the second expansion valve 150. Thereafter, the expanded refrigerant flows into the refrigerator 160 and exchanges heat with the coolant in the refrigerator 160, thereby cooling the coolant and heating the refrigerant. Subsequently, the refrigerant that has passed through the refrigerator 160 flows again into the compressor 110 via the accumulator 170.

[0441] In this case, the first expansion valve 130 is closed so that the refrigerant does not flow toward the evaporator 140. Therefore, when the above process is repeated, the refrigerant circulates.

[0442] Furthermore, in the cooling line 220 , the third pump 221 does not operate, so that the coolant cannot flow in the cooling line 220 .

[0443] Meanwhile, the coolant in coolant circulation line 200 circulates through the operation of second pump 232 and fourth pump 252. Furthermore, the coolant can be heated while passing through condenser 120, heated by coolant heater 233, and heated by waste heat from electrical components 253. The coolant can also be cooled while passing through refrigerator 160. In this case, second directional switching valve 231 and first directional switching valve 212 can adjust their directions to separate heating line 230 from cooling line 210. More specifically, coolant can flow when the upper and right sides of second directional switching valve 231 are connected, and coolant can flow when the lower and left sides of second directional switching valve 231 are connected. Furthermore, when the left and lower sides of first directional switching valve 212 are connected, coolant can flow, and the right side of first directional switching valve 212 can be disconnected. Furthermore, the upper and left sides of third directional switching valve 215 can be connected, and the right side of third directional switching valve 215 can be blocked.

[0444] Therefore, the coolant in heating line 230 passes through second pump 232, coolant heater 233, heater core 234, second directional switching valve 231, and condenser 120 in sequence, then flows back into second pump 232 and circulates. This cycle repeats. In this case, the coolant passes through heater core 234 while exchanging heat with air blown by the blower of air conditioning unit 190, heating the air. The heated air is then supplied to the vehicle interior and used to heat the vehicle interior.

[0445] In addition, the coolant in the cooling line 210 separated from the heating line 230 flows from the fourth pump 252 to the second directional switching valve 231, the electrical component 253, the fourth directional switching valve 261, the third coolant connector 272, the refrigerator 160, the third directional switching valve 215, the radiator 211, and the first directional switching valve 212, and then flows into the fourth pump 252, and then circulates. This cycle is repeated.

[0446] In this case, the upper side and the right side of the fourth directional switching valve 261 may be connected to each other so that the coolant flows toward the refrigerator 160 . The coolant flows toward the refrigerator 160 via the third coolant joint 272 .

[0447] Thus, the electrical components 253 and the refrigerator 160 can be connected in series, and a coolant flow path capable of absorbing both external air and waste heat can be formed. In this structure, since there is no branch in the cooling line 210 circulating through the radiator 211, the electrical components, and the refrigerator 160, the coolant can flow at a nearly constant flow rate, which can improve heating performance.

[0448] In this case, the coolant does not flow toward the battery 213 through the first direction switching valve 212 and the third direction switching valve 215 .

[0449] Figure 24 is a diagram showing an operating state of the system in a cooling mode.

[0450] Reference Figure 24 In the refrigerant circulation line 100, the compressor 110 operates, and high-temperature, high-pressure refrigerant is discharged from the compressor 110. Furthermore, the refrigerant discharged from the compressor 110 is cooled while exchanging heat with the coolant in the condenser 120. Thereafter, the refrigerant cooled and condensed in the water-cooled condenser 120 is divided in the refrigerant branch portion 101. A portion of the refrigerant passes through the refrigerant heat exchanger 180, and is then throttled and expanded while passing through the first expansion valve 130. Thereafter, the expanded refrigerant exchanges heat with the coolant in the cooling line 220 while passing through the evaporator 140, and the coolant in the cooling line 220 is cooled by the refrigerant.

[0451] In addition, the refrigerant evaporated in the evaporator 140 passes through the refrigerant heat exchanger 180 , exchanges heat with the refrigerant before being introduced into the first expansion valve 130 , and then flows into the compressor 110 again via the accumulator 170 .

[0452] The remaining refrigerant divided in the refrigerant branching portion 101 is throttled and expanded while passing through the second expansion valve 150. The expanded refrigerant then evaporates by exchanging heat with the coolant while passing through the refrigerator 160, thereby cooling the coolant. The refrigerant evaporated in the refrigerator 160 flows back into the compressor 110 via the accumulator 170.

[0453] As described above, the refrigerant having passed through the evaporator 140 and the refrigerant having passed through the refrigerator 160 merge with each other in the accumulator 170 and flow into the compressor 110. As the above process is repeated, the refrigerant circulates.

[0454] In addition, the coolant circulates in the cooling line 220 by the operation of the third pump 221. In addition, the coolant passes through the cabin cooler 222 while exchanging heat with the air blown by the blower of the air conditioning device 190, so that the air is cooled. The cooled air is supplied to the interior of the vehicle and is used to cool the interior of the vehicle.

[0455] At the same time, the coolant in the coolant circulation line 200 is circulated by the operation of the second pump 232, the fourth pump 252, and the first pump 214. In addition, the battery 213, the electric components 253, and the refrigerant passing through the condenser 120 can be cooled by the coolant. The heated coolant can be cooled while exchanging heat with the outside air by the operation of the cooling fan 211a of the radiator 211 for the electric components.

[0456] In this case, second directional switching valve 231 and first directional switching valve 212 can adjust their directions so that heating line 230 and cooling line 210 are connected. More specifically, coolant can flow when the upper and left sides of second directional switching valve 231 are connected, and coolant can flow when the lower and right sides of second directional switching valve 231 are connected. Furthermore, coolant can flow when the left and lower sides of first directional switching valve 212 are connected, and the right side of first directional switching valve 212 can be disconnected. Furthermore, the upper and right sides of third directional switching valve 215 can be connected, and the left side of third directional switching valve 215 can be blocked.

[0457] Therefore, the coolant flows from the radiator 211 for electric components to the first directional switching valve 212, the fourth pump 252, the second directional switching valve 231, the condenser 120, the second pump 232, the coolant heater 233, the heater core 234, the second directional switching valve 231, the electric components 253, the second coolant joint 262, and then flows into the radiator 211 for electric components again and circulates. This cycle is repeated.

[0458] In this case, the right line of the fourth directional switching valve 261 may be closed, thereby preventing the coolant from flowing to the fourth connecting line 280 .

[0459] The first direction switching valve 212 may prevent the coolant from flowing from the first direction switching valve 212 to the first coolant junction 271 , and the third direction switching valve 215 may prevent the coolant from flowing from the third direction switching valve 215 to the second coolant junction 262 .

[0460] Furthermore, the coolant can flow from the refrigerator 160 to the first coolant connector 271, the first pump 214, the battery 213, and the third directional switching valve 215 in sequence, and then flow back into the refrigerator 160 and circulate. This cycle repeats. In other words, the battery 213 and the refrigerator 160 can define a separate closed loop, in which the coolant circulates in the cooling line 210 through the first directional switching valve 212 and the third directional switching valve 215, so that the battery 213 can be cooled separately.

[0461] Figure 25 is a view showing an operating state of the system in a normal heating mode.

[0462] Reference Figure 25 In the refrigerant circulation line 100 , the compressor 110 operates, and high-temperature and high-pressure refrigerant is discharged from the compressor 110 . In addition, the refrigerant discharged from the compressor 110 is cooled while exchanging heat with the coolant in the condenser 120 .

[0463] The first expansion valve 130 is closed so that the refrigerant does not pass through the first refrigerant line 100a in which the refrigerant heat exchanger 180 and the evaporator 140 are installed. The refrigerant passes through the refrigerant branch portion 101 and the third expansion valve and flows into the refrigerator 160. In the refrigerator 160, the refrigerant and the coolant exchange heat with each other, so that the refrigerant can be heated.

[0464] The refrigerant having passed through the refrigerator 160 flows again into the compressor 110 via the accumulator 170 .

[0465] Furthermore, in the cooling line 220 , the third pump 221 does not operate, so that the coolant cannot flow in the cooling line 220 .

[0466] Meanwhile, the coolant in the coolant circulation line 200 circulates by the operation of the second pump 232, the fourth pump 252, and the first pump 214. Furthermore, the coolant may be heated while passing through the condenser 120, heated by the coolant heater 233, and heated by waste heat from the electric components 253 and the battery 213. The coolant may be cooled while passing through the refrigerator 160.

[0467] In this case, the second directional switching valve 231 and the first directional switching valve 212 can adjust their directions so that the heating line 230 and the cooling line 210 are separated. More specifically, the coolant can flow when the upper side and the right side of the second directional switching valve 231 are connected to each other, and the coolant can flow when the lower side and the left side of the second directional switching valve are connected to each other. In addition, when the right side and the lower side of the first directional switching valve 212 are connected to each other, the coolant can flow, and the left side of the first directional switching valve can be disconnected.

[0468] Therefore, the coolant in the heating line 230 passes through the second pump 232, the coolant heater 233, the heater core 234, the second direction switching valve 231, and the condenser 120 in sequence, flows into the second pump 232 again, and circulates. This cycle is repeated.

[0469] In addition, the coolant in the cooling line 210 separated from the heating line 230 flows from the fourth pump 252 to the second directional switching valve 231, the electrical component 253, the second coolant connector 262 and the third directional switching valve 215. The upper side, left side and right side of the third directional switching valve 215 can be connected.

[0470] In this case, the right line of the fourth directional switching valve 261 may be closed, thereby preventing the coolant from flowing to the fourth connecting line 280 .

[0471] The refrigerant circulating through the first pump 214 flows to the third direction switching valve 215 via the battery 213, merges with the refrigerant having passed through the electric component 253, and then flows to the refrigerator 160. The coolant cooled in the refrigerator 160 is divided in the first coolant joint 271 and then flows.

[0472] This embodiment has been described in which the coolant is cooled by water-cooled evaporator 140 as a cooling source, and then the vehicle interior is cooled by cabin cooler 222. However, as another embodiment, a conventional air conditioning structure can be applied in which evaporator 140 directly exchanges heat with air, and the cooled air flows into the vehicle interior. Therefore, the present invention can be applied to the structure of an embodiment in which cabin cooler 222 and the coolant line through which the coolant flows between cabin cooler 222 and water-cooled evaporator 140 are eliminated.

[0473] The embodiments of the present invention have been described above in detail with reference to the accompanying drawings.

[0474] The above description is only used to exemplify the technical spirit of the present invention, and those skilled in the art to which the present invention belongs will understand that various modifications, changes and replacements are possible without departing from the basic features of the present invention. Therefore, the embodiments and drawings disclosed in the present invention are not intended to limit but to describe the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by the embodiments and drawings. The scope of protection of the present invention should be interpreted based on the attached claims, and all technical spirits within their equivalent ranges should be interpreted as falling within the scope of the present invention.

[0475] [Explanation of Reference Numerals]

[0476] 100: Refrigerant circulation line 100a: First refrigerant line

[0477] 100b: Second refrigerant line

[0478] 101: Refrigerant branch

[0479] 110: Compressor 120: Water-cooled condenser

[0480] 130: First expansion valve 140: Water-cooled evaporator

[0481] 150: Second expansion valve 160: Refrigeration machine

[0482] 170: Accumulator 180: Refrigerant heat exchanger

[0483] 190: Air conditioning unit

[0484] 200: Coolant circulation line 210: Refrigeration line

[0485] 211: Radiator 211a: Cooling fan

[0486] 212: First directional switching valve 213: Battery

[0487] 214: First pump 215: Third directional switching valve

[0488] 220: Cooling line 221: Third pump

[0489] 222: Cabin cooler 223: Cooling connecting line

[0490] 230: Heating line 231: Second direction switching valve

[0491] 232: Second pump 233: Coolant heater

[0492] 234: Heater core 250: First connecting line

[0493] 251: Storage tank 252: Fourth pump

[0494] 253: Electrical components 260: Second connecting line

[0495] 261: Fourth directional switching valve 262: Second coolant connector

[0496] 270: Third connecting pipeline

[0497] 271: First coolant connection 272: Third coolant connection

[0498] 280: Fourth connecting pipeline 290: Fifth connecting pipeline

[0499] 290a: fourth coolant connector 290b: fifth coolant connector

[0500] 290c: Sixth coolant joint

[0501] 291: Fifth directional switching valve

Claims

1. A vehicle heat pump system, comprising: a compressor configured to compress and circulate a refrigerant; a first heat exchanger configured to condense the compressed refrigerant; a first expansion valve configured to expand the condensed refrigerant; a second heat exchanger configured to evaporate the refrigerant expanded by the first expansion valve by allowing the refrigerant to exchange heat with a coolant; a cabin cooler configured to cool a vehicle interior by allowing the coolant, which has passed through the second heat exchanger, to exchange heat with air; a heat-dissipating heat exchanger configured to allow a coolant for cooling the electric components to exchange heat with outside air; a refrigerant circulation line, in which the compressor, the first heat exchanger, the second heat exchanger, and the refrigerator are arranged, and in which the refrigerant circulates; a refrigeration line configured to cool a heat-generating component by circulating a coolant that exchanges heat with air or the refrigerant; a cooling line in which the cabin cooler is provided, the cooling line being configured to cool the vehicle interior by using the coolant passing through the second heat exchanger; a cooling connecting line, the cooling connecting line being configured to connect the cooling line and the refrigeration line; a heating line configured to heat the vehicle interior by circulating a coolant that exchanges heat with the refrigerant via the first heat exchanger; a first connecting line branching from one side of the cooling line and connected to the heating line; as well as a second connecting line, which branches off from the other side of the cooling line and is connected to the heating line; In the heating mode, the coolant that has passed through the heat dissipation heat exchanger flows into the second heat exchanger. The refrigeration line and the cooling line are connected via a first directional switching valve, and The refrigeration line and the cooling line are separated and connected according to an air-conditioning mode.

2. The vehicle heat pump system according to claim 1, wherein: The cooling line is configured to cool the heat-generating components and the electric components by circulating a coolant that exchanges heat with air or the refrigerant.

3. The vehicle heat pump system according to claim 2, wherein: A third coolant joint and a fifth coolant joint are provided in the refrigeration line, thereby defining a fifth refrigeration line circulating through the heat-radiating heat exchanger and the second heat exchanger.

4. The vehicle heat pump system according to claim 3, wherein: The fifth refrigerant line is connected to a cooling line configured to cool the vehicle interior by circulating a coolant that exchanges heat with the refrigerant via the second heat exchanger, and the cabin cooler is provided in the cooling line.

5. The vehicle heat pump system according to claim 4, wherein: A fourth coolant joint configured to be connected to the cooling line is provided in the fifth refrigerant line, and a fifth direction switching valve configured to determine whether to circulate the coolant to the cooling line is provided in the fifth refrigerant line.

6. The vehicle heat pump system according to claim 1, wherein: One side of the cooling connection line is provided between the second heat exchanger and the cabin cooler.

7. The vehicle heat pump system according to claim 1, wherein: The first connecting line, the second connecting line, and the heating line are connected to a second directional switching valve, and the cooling line and the heating line are connected to or disconnected from each other through the second directional switching valve.

8. The vehicle heat pump system according to claim 7, wherein: A third connecting line branched from a first coolant junction provided in the refrigeration line is provided to pass through the refrigerator, and a third directional switching valve connected to the refrigeration line is provided in the third connecting line.

9. The vehicle heat pump system according to claim 8, wherein: The third connecting line is provided in parallel with the refrigeration line provided with the heat generating component.

10. The vehicle heat pump system according to claim 8, wherein: The heat-generating component is arranged in the third connecting line, a fourth connecting line is arranged between the heat-generating component and the refrigerator, one side of the fourth connecting line is connected to the second connecting line, and the other side of the fourth connecting line is connected to the third connecting line, and a fourth directional switching valve is arranged in an area where the second connecting line and the fourth connecting line are connected.

11. A vehicle heat pump system, comprising: a compressor configured to compress and circulate a refrigerant; a first heat exchanger configured to condense the compressed refrigerant; a first expansion valve configured to expand the condensed refrigerant; a second heat exchanger configured to evaporate the refrigerant expanded by the first expansion valve by allowing the refrigerant to exchange heat with a coolant; a cabin cooler configured to cool a vehicle interior by allowing the coolant, which has passed through the second heat exchanger, to exchange heat with air; a heat-dissipating heat exchanger configured to allow a coolant for cooling the electric components to exchange heat with outside air; a second expansion valve configured to expand the condensed refrigerant; a refrigerator configured to allow the refrigerant expanded by the second expansion valve to exchange heat with the coolant; the electrical component, the electrical component being configured to be cooled by a coolant; a heating line configured to heat the vehicle interior by circulating a coolant that exchanges heat with the refrigerant via the first heat exchanger; a refrigeration line configured to cool the heat-generating component and the electrical component by circulating a coolant that exchanges heat with air or a refrigerant; a first connecting line branching from one side of the cooling line and connected to the heating line; as well as a second connecting line, which branches off from the other side of the cooling line and is connected to the heating line; In the heating mode, the coolant having passed through the heat dissipation heat exchanger exchanges heat with the electrical components and then flows into the refrigerator.

12. The vehicle heat pump system according to claim 11, wherein: The first connecting line, the second connecting line, and the heating line are connected to a second directional switching valve, and the cooling line and the heating line are connected to or disconnected from each other through the second directional switching valve.

13. The vehicle heat pump system according to claim 12, wherein: The electric component is provided in the second connecting line, and a third connecting line branched from a first coolant junction provided in the refrigeration line is provided to pass through the refrigerator.

14. The vehicle heat pump system according to claim 13, wherein: A fourth directional switching valve is provided in the second connecting pipeline, the fourth directional switching valve controlling the flow direction of the coolant that has passed through the electrical component, the fourth directional switching valve is connected to the third coolant joint of the third connecting pipeline through a fourth connecting pipeline, and the third coolant joint is provided on a side adjacent to the inlet of the refrigerator.

15. The vehicle heat pump system according to claim 14, wherein: The first coolant connection and the third coolant connection are integrated and have four branch lines.

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