Vehicle heat pump system

Abstract

The present invention relates to an improved vehicle heat pump system that can prevent time delays that can occur when a refrigerant moves to a rear seat region of a vehicle. The vehicle heat pump system, in which a first air conditioning module for air-conditioning the front seat region of the vehicle and a second air conditioning module for air-conditioning the rear seat region of the vehicle are arranged, comprises: a first circulation line in which a first heat exchange medium circulates; a second circulation line in which a second heat exchange medium circulates; and a chiller inside which the first heat exchange medium and the second heat exchange medium exchange heat with each other. The first heat exchange medium passes through the first air conditioning module, and the second heat exchange medium passes through the second air conditioning module.

Description

Heat pump system for vehicles

[0001] The present invention relates to a heat pump system for a vehicle.

[0002] A heat pump system operates on a cycle where liquid refrigerant evaporates within an evaporator, absorbing heat from the surroundings and becoming a gas. It then liquefies again through a condenser, releasing heat to the surroundings. Applying this system to electric or hybrid vehicles offers the advantage of securing a heat source previously lacking in conventional air conditioning systems.

[0003] These heat pump systems deliver refrigerant to the air conditioning units located in the front and rear of the vehicle. Conventional heat pump systems require a line to deliver refrigerant to the rear of the vehicle.

[0004] Therefore, conventional heat pump systems must have enough refrigerant to prevent the time delay that may occur when the refrigerant moves to the rear seat area of ​​the vehicle, which leads to an increase in the overall operating cost of the heat pump system.

[0005] The present invention is intended to solve the above problems, and an object of an embodiment of the present invention is to provide an improved vehicle heat pump system that can prevent a time delay that may occur when refrigerant moves to the rear seat area of ​​a vehicle.

[0006] In a vehicle heat pump system in which a first air conditioning module for air conditioning a front area of ​​a vehicle and a second air conditioning module for air conditioning a rear area of ​​the vehicle are arranged according to an embodiment of the present invention, the system comprises: a first circulation line through which a first heat exchange medium circulates; a second circulation line through which a second heat exchange medium circulates; and a chiller through which the first heat exchange medium and the second heat exchange medium exchange heat, wherein the first heat exchange medium passes through the first air conditioning module and the second heat exchange medium passes through the second air conditioning module.

[0007] It may be characterized in that an evaporator is arranged in the first circulation line, and a cabin cooler is arranged in the second circulation line.

[0008] The second heat exchange medium may be characterized in that, in cooling mode, it passes through the chiller and then the cabin cooler, and in heating mode, it passes through the cabin cooler without passing through the chiller.

[0009] A coolant heater is arranged in the second circulation line, and the second heat exchange medium may be characterized in that, in heating mode, it passes through the coolant heater and then flows toward the cabin cooler.

[0010] The second circulation line may include a second-first circulation line in which the chiller and battery are arranged.

[0011] The second circulation line may include a second-second circulation line in which the cabin cooler and the chiller are arranged.

[0012] The second circulation line may include a second-third circulation line in which the cabin cooler and the coolant heater are arranged.

[0013] It includes branching means arranged in the first circulation line and the second circulation line, and the branching means may include a first branching means arranged in the first circulation line and a second branching means arranged in the second circulation line.

[0014] The second branching means may include a second branching means arranged in the second-first circulation line and the second-third circulation line, a second branching means arranged in the second-first circulation line and the second-third circulation line and closer to the chiller than the second branching means, and a second branching means arranged in the second-2 circulation line.

[0015] The above 2-1 branch means and the above 2-2 branch means may be characterized in that they guide the second heat exchange medium toward the chiller in the cooling mode.

[0016] The above 2-1 branch means and the above 2-2 branch means may be characterized in that they guide the second heat exchange medium toward the coolant heater in the heating mode.

[0017] In the cooling mode, the second heat exchange medium flowing along the 2-1 circulation line and the 2-2 circulation line may be characterized in that it exchanges heat with the first heat exchange medium.

[0018] The above 2nd-3rd branch means may be characterized in that it induces the second heat exchange medium to face the cabin cooler in the cooling mode.

[0019] The second branch means may include a second-4 branch means arranged in the second-2 circulation line and the second-3 circulation line, and spaced apart from the second-3 branch means with the cabin cooler interposed therebetween.

[0020] It may be characterized in that the second heat exchange medium passing through the cabin cooler in the cooling mode passes through the 2nd-4th branch means and then moves toward the chiller.

[0021] The above 2nd-3rd branch means may be characterized in that it guides the second heat exchange medium passing through the coolant heater in the heating mode toward the cabin cooler.

[0022] The above 2-4 branch means may be characterized by directing the second heat exchange medium passing through the cabin cooler in the heating mode toward the 2-2 branch means.

[0023] According to an embodiment of the present invention, a vehicle heat pump system discloses a structure in which cooled air or heated air is directed to the rear seat area of ​​a vehicle through coolant, without directing the refrigerant toward a second air conditioning module. Accordingly, compared to conventional heat pump systems in which the refrigerant is directed to a second air conditioning module located in the rear seat area of ​​a vehicle, the system can charge a smaller amount of refrigerant, thereby reducing refrigerant charging costs.

[0024] Additionally, according to an embodiment of the present invention, the vehicle heat pump system comprises only one cabin cooler capable of cooling or heating air in the second air conditioning module. Therefore, the number of circulation lines for heating or cooling the heat exchange medium can be reduced, thereby reducing manufacturing costs, installation costs, and installation time.

[0025] FIG. 1 is a structural diagram of a vehicle heat pump system according to an embodiment of the present invention.

[0026] Figure 2 is a diagram illustrating the flow of the first heat exchange medium and the second heat exchange medium in cooling mode.

[0027] Figure 3 is a diagram illustrating the flow of the first heat exchange medium and the second heat exchange medium in heating mode.

[0028] Figure 4 is a diagram illustrating the flow of the second heat exchange medium in battery warm-up mode.

[0029] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0030] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0031] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0032] Additionally, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0033] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0034] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0035] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0036] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0037] Additionally, when described as being formed or arranged “above or below” each component, “above” or “below” includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as “above” or “below,” it can include the meaning of not only the upward direction but also the downward direction based on one component.

[0038] Hereinafter, a vehicle heat pump system will be described in detail with reference to the attached drawings. Regardless of the drawing symbols, identical or corresponding components will be given the same reference numbers and any duplicate descriptions thereof will be omitted.

[0039] FIG. 1 is a structural diagram of a vehicle heat pump system according to an embodiment of the present invention.

[0040] Referring to FIG. 1, a vehicle heat pump system (1) according to an embodiment of the present invention may include a first air conditioning module (120) for air conditioning a front area of ​​a vehicle, a second air conditioning module (140) for air conditioning a rear area of ​​the vehicle, a compressor (200), a second condenser (300), a chiller (400), a coolant heater (500), an accumulator (600), a water pump (700), a circulation line (900), and a branch means (800). First, the first heat exchange medium described in this embodiment may include a refrigerant, and the second heat exchange medium may include a cooling water. Therefore, hereinafter, the first heat exchange medium will be referred to as a refrigerant, and the second heat exchange medium will be referred to as a cooling water.

[0041] The first air conditioning module (120) may include a first case (122), an evaporator (124), a first condenser (126), and a PTC heater (128).

[0042] The first case (122) can accommodate an evaporator (124), a first condenser (126), and a PTC heater (128) therein. An outlet through which cooled or heated air is discharged can be formed in the first case (122).

[0043] An evaporator (124) may be placed inside the first case (122). The evaporator (124) may accommodate a liquid refrigerant that has passed through an outdoor heat exchanger. Air passing through the evaporator (124) may be cooled by heat exchange with the refrigerant accommodated in the evaporator (124).

[0044] The first condenser (126) can be placed inside the first case (122). The first condenser (126) can cool the high-temperature, high-pressure refrigerant discharged from the compressor (200) to turn it into a liquid refrigerant.

[0045] A mode door may be positioned between the evaporator (124) and the first condenser (126). The mode door may rotate according to the air conditioning mode of the vehicle. For example, the mode door in the cooling mode may guide air so that the air introduced into the interior of the first case (122) does not go toward the first condenser (126), and the mode door in the heating mode may guide air so that the air introduced into the interior of the first case (122) goes from the evaporator (124) to the first condenser (126).

[0046] The PTC heater (128) may be placed in front of the first condenser (126) along the direction in which air flows from the inside to the outside of the first case (122). The PTC heater (128) operates in the heating mode of the vehicle and may heat exchange air so that the air passing through the first condenser (126) is heated. In addition, the PTC heater (128) may be used not only to heat the air, but also to cool the air in the cooling mode among the air conditioning modes of the vehicle.

[0047] The second air conditioning module (140) may include a second case (142) and a cabin cooler (144).

[0048] The second case (142) can accommodate a cabin cooler (144) inside. An exhaust port through which cooled or heated air is discharged can be formed in the second case (142).

[0049] A cabin cooler (144) may be placed inside the second case (142). The cabin cooler (144) may accommodate a second heat exchange medium, i.e., coolant, within the cabin cooler. More specifically, the cabin cooler (144) may accommodate cooled coolant or heated coolant within the cabin cooler. Accordingly, air passing through the cabin cooler (144) may be cooled or heated depending on the vehicle's air conditioning mode. In other words, the cabin cooler (144) may be operable in both the cooling mode and the heating mode among the vehicle's air conditioning modes.

[0050] The compressor (200) can compress the refrigerant. The compressor (200) can discharge the refrigerant, which has been compressed into a high-temperature, high-pressure gaseous state, toward the condenser. Here, the compressor (200) may be referred to as a compressor.

[0051] The second condenser (300) may be installed at the front of the vehicle. The second condenser (300) may store the refrigerant that has passed through the first condenser (126) inside. Air flowing into the vehicle (air outside the vehicle cabin) may be heat-exchanged with the refrigerant contained inside the second condenser (300). Here, the second condenser (300) may be referred to as an outdoor heat exchanger.

[0052] The chiller (400) can accommodate refrigerant that has passed through the second condenser (300) therein. In addition, the chiller (400) can accommodate coolant that has passed through the cabin cooler (144) therein, or coolant that moves through the second-first circulation line to be described later therein. That is, the chiller (400) can accommodate both refrigerant and coolant therein. The chiller (400) may be formed with three holes to accommodate refrigerant or coolant therein, but is not limited thereto, and the chiller (400) may be formed with two holes or three or more holes.

[0053] The coolant heater (500) may be placed in the 2-3 circulation line (946) described later. The coolant heater (500) may operate in the vehicle's heating mode or battery warm-up mode. The coolant heater (500) may accommodate coolant therein. The coolant heater (500) may heat the coolant flowing through the 2-3 circulation line (946).

[0054] The accumulator (600) may be placed in the first circulation line, which will be described later. The accumulator (600) may receive the refrigerant that has passed through the chiller (400). In addition, the accumulator (600) may receive the refrigerant that has passed through the evaporator (124) of the first air conditioning module (120). The accumulator (600) may selectively discharge the refrigerant in a liquid phase (liquid state) and a gaseous phase (gaseous state). The accumulator (600) may be referred to as an accumulator.

[0055] The water pump (700) may be placed in the 2-1 circulation line (942) and the 2-2 circulation line (944), which will be described later. The water pump (700) may cause the cooling water contained in the 2-1 circulation line (942) and the 2-2 circulation line (944) to flow in one direction. Therefore, the direction of movement of the cooling water may be determined through the water pump (700).

[0056] The branching means (800) may be arranged in the first circulation line and the second circulation line to induce the direction of movement of the refrigerant or cooling water. The branching means (800) may include a first branching means (820) and a second branching means (840).

[0057] The first branch means (820) may be arranged in the first circulation line, which will be described later. The first branch means (820) may induce the direction of movement of the refrigerant moving through the first circulation line. The first branch means (820) may include the first-1 branch means (822) and the first-2 branch means (824).

[0058] The first-first branch means (822) may be arranged between the first condenser (126) and the second condenser (300) in the first circulation line. The first-first branch means (822) may include a three-way valve having three inlets and outlets. The first-first branch means (822) may induce the direction of movement of the refrigerant passing through the first condenser (126).

[0059] The first-second branch means (824) may be placed in an area past the first condenser (126) of the first circulation line. The first-second branch means (824) may include a 2-way valve having two inlets and outlets.

[0060] The second branch means (840) may be arranged in the second circulation line. The second branch means (840) may induce the direction of movement of the cooling water moving through the second circulation line. The second branch means (840) may include the second-first branch means (842), the second-second branch means (844), the second-third branch means (846), and the second-fourth branch means (848).

[0061] The 2-1 branch means (842) may be arranged in the 2-1 circulation line (942) and the 2-3 circulation line (946) described later. The 2-1 branch means (842) may include a 3-way valve having three inlets and outlets. The 2-1 branch means (842) may induce the direction of movement of the coolant passing through the coolant heater (500).

[0062] The 2-2 branch means (844) may be arranged in the 2-1 circulation line (942) and the 2-3 circulation line (946) to be described later. The 2-2 branch means (844) may be arranged closer to the chiller (400) than the 2-1 branch means (842). The 2-2 branch means (844) may include a 3-way valve having three inlets and outlets. The 2-2 branch means (844) may induce a movement direction of the cooling water that has passed through the 2-1 branch means (842). In addition, the 2-2 branch means (844) may induce a movement direction of the cooling water that has passed through the water pump (700).

[0063] The 2-3 branch means (846) may be arranged in the 2-2 circulation line (944) to be described later. The 2-3 branch means (846) may be arranged between the chiller (400) and the cabin cooler (144). Alternatively, the 2-3 branch means (846) may be arranged between the cabin cooler (144) and the coolant heater (500). The 2-3 branch means (846) may include a 3-way valve having three inlets and outlets. The 2-3 branch means (846) may induce a movement direction of the coolant that has passed through the cabin cooler (144). In addition, the 2-3 branch means (846) may induce a movement direction of the coolant that has passed through the coolant heater (500).

[0064] The 2-4 branch means (848) may be arranged in the 2-3 circulation line (946) to be described later. The 2-4 branch means (848) may be arranged between the coolant heater (500) and the water pump (700). The 2-4 branch means (848) may include a 2-way valve having two inlets and outlets. The 2-4 branch means (848) may induce a movement direction of the coolant that has passed through the water pump (700). In addition, the 2-4 branch means (848) may induce a movement direction of the coolant that has passed through the 2-2 branch means (844).

[0065] Among the branch means (800), the 2-1 branch means (842) and the 2-2 branch means (844) can guide the coolant toward the chiller (400) in the cooling mode of the vehicle and can guide the coolant toward the coolant heater (500) in the heating mode. In addition, the 2-1 branch means (842) and the 2-2 branch means (844) can connect the 2-1 circulation line (942) and the 2-3 circulation line (946), which will be described later, in the battery warm-up mode of the vehicle. That is, the 2-1 branch means (842) and the 2-2 branch means (844) can change the flow of the coolant according to the air conditioning mode of the vehicle. Therefore, since a separate circulation line (900) for inducing the movement direction of the coolant is not added, the manufacturing cost, installation cost, and installation time of the circulation line (900) can be reduced.

[0066] The circulation line (900) is a line through which refrigerant or cooling water flows, and the circulation line (900) may be a pipe. The circulation line (900) may include a first circulation line and a second circulation line.

[0067] The first circulation line may be a line through which the refrigerant, which is the first heat exchange medium, is circulated. The first circulation line may include a first-first circulation line (922) and a first-second circulation line (924).

[0068] The first-first circulation line (922) may be a line through which refrigerant may move in the vehicle's cooling mode. As illustrated in FIG. 2, a first condenser (126), a compressor (200), a second condenser (300), an evaporator (124), an accumulator (600), a first-first branch means (822), and a first-second branch means (824) may be arranged in the first-first circulation line (922).

[0069] The first-second circulation line (924) may be a line through which refrigerant may move in the vehicle's heating mode. As illustrated in FIG. 3, a first condenser (126), a compressor (200), a first-first branch means (822), a first-second branch means (824), and an accumulator (600) may be arranged in the first-second circulation line (924).

[0070] The second circulation line may be a line through which cooling water, which is a second heat exchange medium, is circulated. The second circulation line may include a second-first circulation line (942), a second-second circulation line (944), and a second-third circulation line (946).

[0071] The 2-1 circulation line (942) may be a line through which coolant may flow in the vehicle's cooling mode. As illustrated in FIG. 2, a chiller (400), a water pump (700), a 2-1 branch means (842), a 2-2 branch means (844), a battery (B), and a reserve tank (R) may be arranged in the 2-1 circulation line (942).

[0072] The 2-2 circulation line (944) may be a line through which coolant may flow in the vehicle's cooling mode. As illustrated in FIG. 2, a cabin cooler (144), a chiller (400), a water pump (700), a 2-3 branch means (846), and a 2-4 branch means (848) may be arranged in the 2-2 circulation line (944).

[0073] The 2-3 circulation line (946) may be a line through which coolant may flow in the vehicle's heating mode. As illustrated in FIG. 3, a cabin cooler (144), a coolant heater (500), a water pump (700), a 2-1 branch means (842), a 2-2 branch means (844), a 2-3 branch means (846), and a 2-4 branch means (848) may be arranged in the 2-3 circulation line (946).

[0074] The 2-4 circulation line (948) may be a line through which coolant may flow in the vehicle's battery warm-up mode. As illustrated in FIG. 4, a cabin cooler (144), a chiller (400), a coolant heater (500), a water pump (700), a 2-1 branch means (842), a 2-2 branch means (844), a 2-3 branch means (846), a 2-4 branch means (848), a battery (B), and a reserve tank (R) may be arranged in the 2-4 circulation line (948).

[0075] Below, the flow of refrigerant and coolant according to the vehicle's air conditioning mode is described.

[0076] Figure 2 is a diagram illustrating the flow of the first heat exchange medium and the second heat exchange medium in cooling mode.

[0077] Referring to FIGS. 1 and 2, in the cooling mode of the vehicle, the refrigerant moves through the 1-1 circulation line (922), and the coolant moves through the 2-1 circulation line (942) and the 2-2 circulation line (944).

[0078] More specifically, in the cooling mode of the vehicle, the refrigerant received in the 1-1 circulation line (922) sequentially passes through the compressor (200), the 1st condenser (126), the expansion valve (EV), the 1-1 branch means (822), the 2nd evaporator (124), the expansion valve (EV), the evaporator (124), and the accumulator (600) before heading back to the compressor (200). During this process, the refrigerant that has passed through the 2nd condenser (300) may be branched and moved toward the evaporator (124) and the chiller (400).

[0079] In addition, in the cooling mode of the vehicle, the coolant contained in the 2-1 circulation line (942) sequentially passes through the water pump (700), the reserve tank (R), the 2-1 branch means (842), the 2-2 branch means (844), the chiller (400), and the battery (B) before heading back to the water pump (700). In this process, the coolant passing through the chiller (400) is cooled while exchanging heat with the refrigerant passing through the chiller (400), and the cooled coolant heads from the chiller (400) to the battery (B).

[0080] In addition, in the cooling mode of the vehicle, the coolant received in the 2-2 circulation line (944) sequentially passes through the water pump (700), the 2-4 branch means (848), the chiller (400), the 2-3 branch means (846), and the cabin cooler (144) before heading back to the water pump (700). In this process, the coolant passing through the chiller (400) is cooled while exchanging heat with the refrigerant passing through the chiller (400), and the cooled coolant heads from the chiller (400) to the cabin cooler (144) through the 2-3 branch means (846).

[0081] In this way, when the vehicle is in cooling mode, the coolant passes through the cabin cooler (144) after passing through the chiller (400). In addition, the coolant passes through the battery (B) after passing through the chiller (400). That is, since the vehicle heat pump system (1) according to the embodiment of the present invention provides two circulation lines that are independently constructed to cool the cabin cooler (144) and the battery (B) through one chiller (400), the movement time of the heat exchange medium can be reduced compared to a conventional heat pump system that passes through both the battery (B) and the second air conditioning module (140). Accordingly, the phenomenon of the cooling quality of the heat exchange medium deteriorating due to the increase in the movement time of the heat exchange medium, thereby reducing the cooling efficiency of the rear seat area of ​​the vehicle, can be prevented.

[0082] Figure 3 is a diagram illustrating the flow of the first heat exchange medium and the second heat exchange medium in heating mode.

[0083] Referring to FIGS. 1 and 3, in the vehicle heating mode, the refrigerant moves through the 1st-2nd circulation line (924), and the coolant moves through the 2nd-3rd circulation line (946).

[0084] More specifically, in the vehicle heating mode, the refrigerant received in the 1-2 circulation line (924) sequentially passes through the compressor (200), the first condenser (126), the expansion valve (EV), the 1-1 branch means (822), and the accumulator (600) before heading back to the compressor (200).

[0085] In addition, in the vehicle heating mode, the coolant received in the 2-3 circulation line (946) sequentially passes through the water pump (700), the 2-2 branch means (844), the 2-1 branch means (842), the coolant heater (500), the 2-3 branch means (846), and the cabin cooler (144) before heading back to the water pump (700). In this process, the coolant is heated while passing through the coolant heater (500), and the heated coolant passes through the 2-3 branch means (846) and the cabin cooler (144).

[0086] In this way, when the vehicle is in heating mode, the coolant passes through the cabin cooler (144) without passing through the chiller (400). More specifically, the coolant passes through the coolant heater (500) and then flows toward the cabin cooler (144) in a heated state. That is, the second air conditioning module (140) can heat air with only the cabin cooler (144) without the PTC heater (128). In addition, the second air conditioning module (140) can heat or cool air through a single heat exchanger (cabin cooler (144)). Therefore, since there is no need to additionally provide a PTC heater (128) for heating the air, the purchase cost, installation cost, and installation time can be reduced.

[0087] Figure 4 is a diagram illustrating the flow of the second heat exchange medium in battery warm-up mode.

[0088] Referring to FIGS. 1 and 4, in the vehicle's battery warm-up mode, coolant flows through the 2nd-4th circulation line (948). Here, the battery warm-up mode is one of the vehicle modes designed to warm up the battery (B) in winter or when the vehicle does not start smoothly.

[0089] More specifically, in the vehicle's battery warm-up mode, the coolant contained in the 2-4 circulation line (948) passes through the water pump (700), the cabin cooler (144), the 2-3 branch means (846), the coolant heater (500), the 2-1 branch means (842), the reserve tank (R), and the water pump (700) to reach the battery (B). In this process, the coolant passes through the coolant heater (500) and is directed to the battery (B) in a heated state. When the coolant in this heated state reaches the battery (B), the battery (B) can be heated.

[0090] In this way, the vehicle heat pump system (1) according to an embodiment of the present invention can allow the refrigerant that has passed through the chiller (400) to pass through the first air conditioning module (120), and the coolant that has passed through the chiller (400) to pass through the second air conditioning module (140). That is, the vehicle heat pump system (1) according to an embodiment of the present invention discloses a structure in which the cooled air or heated air is directed toward the rear seat area of ​​the vehicle through the coolant so that the refrigerant does not direct toward the second air conditioning module (140). Therefore, since less refrigerant can be charged compared to a conventional heat pump system in which the refrigerant directs to the second air conditioning module (140) arranged in the rear seat area of ​​the vehicle, the cost of charging the refrigerant can be reduced.

[0091] In addition, all vehicle heat pump systems (1) have a structure in which the refrigerant leaving the compressor (200) moves together with a certain amount of oil. Therefore, the amount of oil remaining inside the compressor (200) decreases. At this time, since the conventional heat pump system directs the refrigerant to the second air conditioning module (140) located in the rear seat area of ​​the vehicle, the compressor (200) that has not received oil return for a certain period of time has a problem in that the internal components do not operate smoothly, resulting in a decrease in efficiency and performance. In addition, this causes the inconvenience of having to additionally charge oil, and since the cost of oil charging is added, there is a problem in that the operating cost of the heat pump system increases.

[0092] The vehicle heat pump system (1) according to an embodiment of the present invention discloses a structure in which a refrigerant circulation line passes only to the first air conditioning module (120) positioned in the front seat area of ​​the vehicle, thereby solving problems inherent in conventional heat pump systems. Accordingly, reduction in efficiency and performance of the compressor (200) can be prevented, and operating costs of the heat pump system can be reduced by eliminating the need for additional oil charging.

[0093] In addition, the vehicle heat pump system (1) according to the embodiment of the present invention has only one cabin cooler (144) capable of cooling or heating air in the second air conditioning module (140). Therefore, the circulation line (900) for heating or cooling the heat exchange medium can be reduced, thereby reducing manufacturing costs, installation costs, and installation time.

[0094] While the present invention has been described above with reference to specific embodiments, those skilled in the art will appreciate that various modifications and variations can be made to the present invention without departing from the spirit and scope of the invention as defined in the claims below. Furthermore, any differences resulting from such modifications and variations should be construed as being within the scope of the present invention as defined in the appended claims.

[0095] [Explanation of symbols]

[0096] 1: Vehicle heat pump system 100: Air conditioning module

[0097] 120: 1st air conditioning module 122: 1st case

[0098] 124: Evaporator 126: First condenser

[0099] 128: PTC heater 140: Second air conditioning module

[0100] 142: Second Case 144: Cabin Cooler

[0101] 200: Compressor 300: Secondary condenser

[0102] 400: Chiller 500: Coolant Heater

[0103] 600: Accumulator 700: Water pump

[0104] 800: Branching means 820: First branching means

[0105] 822: Branching means 1-1 824: Branching means 1-2

[0106] 840: Second branching means 842: Second-1 branching means

[0107] 844: 2nd-2nd branching means 846: 2nd-3rd branching means

[0108] 848: 2nd-4th branch means 900: Circulation line

[0109] 922: Circulation Line 1-1 924: Circulation Line 1-2

[0110] 942: Circulation Line 2-1 944: Circulation Line 2-2

[0111] 946: Circulation Line 2-3 948: Circulation Line 2-4

[0112] B: Battery R: Reserve Tank

[0113] EV: Expansion Valve

Claims

1. In a vehicle heat pump system in which a first air conditioning module for air conditioning the front area of ​​the vehicle and a second air conditioning module for air conditioning the rear area of ​​the vehicle are arranged, A first circulation line through which a first heat exchange medium is circulated; A second circulation line through which a second heat exchange medium is circulated; and A chiller in which the first heat exchange medium and the second heat exchange medium are heat-exchanged inside; A vehicle heat pump system, characterized in that the first heat exchange medium passes through the first air conditioning module, and the second heat exchange medium passes through the second air conditioning module.

2. In paragraph 1, An evaporator is placed in the first circulation line, A vehicle heat pump system characterized in that a cabin cooler is arranged in the second circulation line.

3. In paragraph 2, The above second heat exchange medium is, In cooling mode, after passing through the chiller, it passes through the cabin cooler. A vehicle heat pump system characterized in that, in heating mode, heat passes through the cabin cooler without passing through the chiller.

4. In paragraph 3, A coolant heater is placed in the second circulation line. The above second heat exchange medium is, A vehicle heat pump system characterized in that, in heating mode, the coolant passes through the coolant heater and then flows toward the cabin cooler.

5. In paragraph 4, The above second circulation line is, A vehicle heat pump system including a second circulation line in which the above chiller and battery are arranged.

6. In paragraph 5, The above second circulation line is, A vehicle heat pump system including a second circulation line in which the cabin cooler and the chiller are arranged.

7. In paragraph 6, The above second circulation line is, A vehicle heat pump system including a second-third circulation line in which the cabin cooler and the coolant heater are arranged.

8. In paragraph 7, Including branch means arranged in the first circulation line and the second circulation line, The above branching means are, A first branch means arranged in the first circulation line and A vehicle heat pump system comprising a second branch means arranged in the second circulation line.

9. In paragraph 8, The above second branch means is, A 2-1 branch means arranged in the above 2-1 circulation line and the above 2-3 circulation line, A 2-2 branch means is arranged in the 2-1 circulation line and the 2-3 circulation line, and is arranged closer to the chiller than the 2-1 branch means. A vehicle heat pump system including a 2-3 branch means arranged in the above 2-2 circulation line.

10. In paragraph 9, The above 2-1 branch means and the above 2-2 branch means, A vehicle heat pump system characterized in that the second heat exchange medium is directed toward the chiller in the cooling mode.

11. In paragraph 9, The above 2-1 branch means and the above 2-2 branch means, A vehicle heat pump system characterized in that the second heat exchange medium is directed toward the coolant heater in the heating mode.

12. In paragraph 9, A vehicle heat pump system, characterized in that the second heat exchange medium flowing along the 2-1 circulation line and the 2-2 circulation line in the cooling mode exchanges heat with the first heat exchange medium.

13. In paragraph 12, The above 2nd and 3rd branch means are, A vehicle heat pump system characterized in that the second heat exchange medium is directed toward the cabin cooler in the cooling mode.

14. In paragraph 9, The above second branch means is, A vehicle heat pump system comprising a 2-4 branch means disposed in the 2-2 circulation line and the 2-3 circulation line, and spaced apart from the 2-3 branch means with the cabin cooler interposed therebetween.

15. In paragraph 14, A vehicle heat pump system, characterized in that the second heat exchange medium passing through the cabin cooler in the cooling mode passes through the 2nd-4th branch means and then moves toward the chiller.

16. In paragraph 14, The above 2nd and 3rd branch means are, A vehicle heat pump system characterized in that the second heat exchange medium passing through the coolant heater in the heating mode is directed toward the cabin cooler.

17. In paragraph 16, The above 2-4 branch means are, A vehicle heat pump system characterized in that the second heat exchange medium passing through the cabin cooler in the heating mode is directed toward the second-second branch means.

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