Integrated heat exchager and heat exchange system including the same
Patent Information
- Application Number
- KR1020250025752
- Authority / Receiving Office
- KR · KR
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2026-09-04
Smart Images
Figure PAT00001_ABST
Abstract
Description
Technology Field
[0001] The present invention relates to an integrated heat exchanger mounted on an electric vehicle and a heat exchange system provided with the integrated heat exchanger, and more specifically, to a heat exchanger in which a water-cooled condenser, a double heat exchanger, and a chiller are integrally formed, and a heat exchange system including the same. Background Technology
[0003] In conventional internal combustion engine vehicles, air-cooled condensers, which utilize air as a heat source for cooling, were widely used as the primary heat exchanger components of the air conditioning system. However, since electric vehicles do not carry internal combustion engines, there is no need for engine coolant; instead, an efficient system is required to cool the battery and electric motor. The most critical aspect of an electric vehicle's cooling system is maintaining the temperature of electronic devices, such as the battery, at an appropriate level to maximize performance and ensure system stability. Consequently, there has been a shift from the existing air-cooling method to one that utilizes coolant.
[0004] In particular, in electric vehicles, coolant is utilized not only for engine components but also for cooling battery and heat exchanger systems; consequently, water-cooled plate heat exchangers are being applied. Water-cooled heat exchangers offer higher thermal efficiency than air-cooled ones and play a crucial role in enhancing cooling efficiency within the vehicle. Accordingly, heat exchangers for battery cooling are also predominantly adopted in the form of water-cooled plate heat exchangers, contributing to the improvement of electric vehicle performance.
[0005] Electric vehicles require a compact design, and designs that allow for the modular assembly of various components are becoming increasingly important. When combining various parts, including heat exchangers, into a single package, optimization of layout, size, and connection methods is necessary. This enables increased efficiency of vehicle space and promotes productivity and cost reduction.
[0006] However, problems that may arise at the connection points of these parts are becoming a challenge that needs to be addressed. In particular, if refrigerant leakage occurs at the piping connections and sealing points between parts, it can lead to system performance degradation, which not only causes dissatisfaction among consumers but also results in increased costs for replacing parts. The problem to be solved
[0008] The present invention was devised to solve the problems described above, and has one objective of providing a heat exchange system that minimizes connections between parts and solves the problem of refrigerant leakage in the sealing part, thereby preventing performance degradation due to refrigerant leakage.
[0009] In addition, the present invention has the objective of providing a heat exchange system that can prevent an increase in parts replacement costs due to refrigerant leakage problems and improve the reliability of the system.
[0010] In addition, the present invention has the objective of providing a heat exchange system having a modular structure that is easy to assemble and increases the space efficiency of an electric vehicle through a compact design in which a water-cooled condenser, a double heat exchanger, and a chiller are integrated.
[0011] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below. means of solving the problem
[0013] As a technical means to achieve the above-mentioned technical problem, an integrated heat exchanger is provided. In one embodiment, the integrated heat exchanger comprises a heat exchanger provided as a single unit in which plate-shaped heat exchangers are stacked, wherein the heat exchanger comprises: a first heat exchanger; a second heat exchanger connected to and coupled with the first heat exchanger; and a third heat exchanger connected to and communicating with the first heat exchanger and the second heat exchanger, wherein the second heat exchanger and the third heat exchanger are arranged in parallel in the height direction of the first heat exchanger, and the heat exchange volume of the heat exchanger may be provided in the order of the first heat exchanger, the third heat exchanger, and the second heat exchanger.
[0014] In one embodiment, the second heat exchanger and the third heat exchanger are arranged vertically and connected in parallel with each other, and the first heat exchanger may be connected in series with the second heat exchanger and the third heat exchanger, respectively.
[0015] In one embodiment, the first heat exchanger is provided as the entire surface area of the stacking surface of the plate-shaped heat exchanger, and the second heat exchanger and the third heat exchanger are provided by dividing the stacking surface, wherein the second heat exchanger occupies the first surface area within the stacking surface and the third heat exchanger occupies the second surface area within the stacking surface, and the first surface area and the second surface area are combined to form the entire surface area of the stacking surface, and the first surface area may be provided smaller than the second surface area.
[0016] In one embodiment, the second heat exchanger may be positioned above the third heat exchanger.
[0017] In one embodiment, the first heat exchanger is a heat exchanger that exchanges heat with a high-temperature, high-pressure refrigerant and cooling water, the third heat exchanger is a heat exchanger that exchanges heat with a low-temperature, low-pressure refrigerant and cooling water, and the second heat exchanger may be an internal heat exchanger that exchanges heat between the refrigerant of the first heat exchanger and the refrigerant of the third heat exchanger.
[0018] In one embodiment, the first heat exchanger is provided as a condenser that condenses the refrigerant into a low-temperature liquid state through heat exchange between the high-temperature, high-pressure gaseous refrigerant and the cooling water, the second heat exchanger is provided as a double heat exchanger that performs heat exchange between refrigerants in separate flow paths, and the third heat exchanger can be provided as a chiller that lowers the temperature of the cooling water through heat exchange between the refrigerant and the cooling water.
[0019] In one embodiment, the apparatus further includes a first plate and a second plate coupled to a heat exchanger with the heat exchanger in between, wherein the first plate is coupled to a first heat exchanger and has a first refrigerant inlet for refrigerant to flow in, a first cooling water inlet for cooling water to flow in and out, and a first cooling water outlet formed therein, and the second plate is coupled to a second heat exchanger and a third heat exchanger and has a second refrigerant inlet and a second refrigerant outlet, and a second cooling water inlet and a second cooling water outlet for cooling water to flow in and out formed therein.
[0020] In one embodiment, the first heat exchanger is a heat exchanger that exchanges heat with high temperature and high pressure refrigerant and cooling water, the third heat exchanger is a heat exchanger that exchanges heat with low temperature and low pressure refrigerant and cooling water, the second heat exchanger is an internal heat exchanger that exchanges heat between the refrigerant of the first heat exchanger and the refrigerant of the third heat exchanger, and the low temperature and low pressure refrigerant that has passed through the third heat exchanger flows into the second heat exchanger and is combined with the low temperature and low pressure refrigerant flowing into the second refrigerant inlet to exchange heat with the high temperature and high pressure refrigerant.
[0021] In one embodiment, the third heat exchanger further includes a third heat exchanger expansion section for expanding the refrigerant discharged from the second heat exchanger and introducing it into the interior of the third heat exchanger, wherein the third heat exchanger expansion section may include an expansion section that expands the refrigerant through an expansion valve and communicates with a first refrigerant outlet extending from a first refrigerant inlet and a transfer section; and a transfer section that provides a transfer path for the refrigerant before expansion or the refrigerant after expansion.
[0022] In one embodiment, the inlet of the third heat exchanger expansion section is in communication with the outlet of the second heat exchanger, and the outlet of the expansion section may be in communication with the inlet of the third heat exchanger.
[0023] In one embodiment, the refrigerant passing through the second heat exchanger is branched at a branching point, wherein at the branching point, a portion of the refrigerant is discharged to the outside through the first refrigerant outlet, and the remainder is introduced into the third heat exchanger.
[0024] In one embodiment, the branch point may be provided within the third heat exchanger expansion section.
[0025] In one embodiment, the transfer section is positioned at the rear end of the expansion section, the expansion section extends from the lower part of the second heat exchanger to the upper part of the third heat exchanger, and the transfer section may extend from the upper part of the third heat exchanger to the lower part of the third heat exchanger.
[0026] In one embodiment, the expansion section is positioned at the rear end of the transfer section, the transfer section extends from the lower part of the second heat exchanger to the lower part of the third heat exchanger, and the expansion section may be provided at the lower part of the third heat exchanger.
[0027] In one embodiment, the transfer unit may be provided inside the third heat exchanger.
[0028] In one embodiment, the transfer section may be provided as a recessed flow path adjacent to the third heat exchanger on the inner side of the second plate.
[0029] In one embodiment, the transfer section may be provided in the form of a pipe connected to a region corresponding to the third heat exchanger on the outer side of the second plate.
[0030] In one embodiment, the first heat exchanger comprises: a first region in communication with a first cooling water inlet, a first cooling water outlet, a receiver dryer that performs gas-liquid separation of the refrigerant, and a first refrigerant inlet, where the refrigerant is condensed; a second region in communication with the first region and a second heat exchanger, provided adjacent to the second heat exchanger and a third heat exchanger, where the refrigerant is subcooled; a first cooling water passage forming a cooling water flow path connecting the first cooling water inlet and the first cooling water outlet in a U-shape within the first region; and a first refrigerant passage forming a refrigerant flow path connecting the first refrigerant inlet and the second heat exchanger within the first region, the receiver dryer, and the second region, provided adjacent to the first cooling water passage, wherein the first cooling water passage and the first refrigerant passage may be provided such that the direction of movement of the refrigerant and the direction of movement of the cooling water within the first region are opposite directions.
[0031] In one embodiment, the second heat exchanger includes a second refrigerant passage extending from a first refrigerant passage to a first refrigerant outlet; and a third refrigerant passage connecting a second refrigerant inlet and a second refrigerant outlet in a U-shape within the second heat exchanger; and the third heat exchanger may include a second cooling water passage connecting a second cooling water inlet and a second cooling water outlet in a U-shape; and a fourth refrigerant passage for adding refrigerant introduced from an expansion section to the third refrigerant passage.
[0032] In addition, the present invention provides a heat exchange system comprising an integrated heat exchanger. In one embodiment, the heat exchange system comprises: a first coolant line through which coolant circulates, wherein a reservoir for storing coolant, an electrical module, a first heat exchanger, and a front heat exchanger of a vehicle are arranged; a first refrigerant line through which refrigerant flows, wherein an inner condenser, a first heat exchanger, a second heat exchanger, and a thermal expansion valve are arranged in an air conditioning case for controlling air inside a vehicle; a second refrigerant line through which refrigerant flows, wherein an evaporator, a third heat exchanger, a second heat exchanger, and a compressor are arranged in an air conditioning case; a second coolant line through which coolant circulates, wherein a third heat exchanger and a battery are arranged; and a first branch line and a second branch line that branch off from the second refrigerant line between the third heat exchanger and the second heat exchanger and merge at the front end of the compressor, wherein the third heat exchanger and the third heat exchanger expansion valve are arranged in the first branch line and the second heat exchanger is arranged in the second branch line. Effects of the invention
[0034] According to one embodiment of the present invention as described above, there is an advantage of minimizing connections between parts and solving the problem of refrigerant leakage in the sealing part, thereby preventing performance degradation due to refrigerant leakage.
[0035] In addition, the present invention has the advantage of preventing increased component replacement costs due to refrigerant leakage problems and improving the reliability of the system.
[0036] In addition, the present invention has the advantage of increasing the space efficiency of an electric vehicle and facilitating assembly due to a compact design in which a water-cooled condenser, a double heat exchanger, and a chiller are integrated.
[0037] The effects of the present invention are not limited to the effects described above, and unmentioned effects will be clearly understood by those skilled in the art from this specification and the attached drawings. Brief explanation of the drawing
[0039] FIG. 1 is a perspective view of an integrated heat exchanger according to one embodiment of the present invention. FIG. 2 is a drawing showing the stacked surface of a heat exchanger according to one embodiment of the present invention. Figure 3 is a simplified diagram showing the interior of the integrated heat exchanger of Figure 1. FIG. 4 is a perspective view of an integrated heat exchanger according to another embodiment of the present invention. Figure 5 is a simplified diagram showing the interior of the integrated heat exchanger of Figure 4. FIG. 6 is a perspective view of an integrated heat exchanger according to another embodiment of the present invention. Figure 7 is a simplified diagram showing the interior of the integrated heat exchanger of Figure 6. FIG. 8 is a schematic diagram showing a heat exchange system according to one embodiment of the present invention. Specific details for implementing the invention
[0040] Embodiments of the present invention are described below with reference to the attached drawings to enable those skilled in the art to easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.
[0041] Throughout this specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "electrically connected" with other elements interposed between them.
[0042] Throughout this specification, when a component is described as being located “on” another component, this includes not only cases where a component is in contact with another component, but also cases where another component exists between the two components.
[0043] Throughout this specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Throughout this specification, terms of degree such as "about," "substantially," etc., are used to mean at or near the stated value when inherent manufacturing and material tolerances are presented in the said meaning, and are used to prevent unscrupulous infringers from unfairly exploiting the disclosure in which precise or absolute values are mentioned to aid in understanding this specification. Throughout this specification, terms of degree such as "step of" or "step of" do not mean "step for."
[0044] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings and the contents described below. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Throughout the specification, the same reference numerals indicate the same components.
[0045] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings and the contents described below. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Throughout the specification, the same reference numerals indicate the same components.
[0046] The present invention provides an integrated heat exchanger (1000). FIG. 1 is a perspective view of an integrated heat exchanger (1000) according to one embodiment of the present invention, FIG. 2 is a drawing showing a stacked surface of a heat exchanger according to one embodiment of the present invention, and FIG. 3 is a drawing showing the interior of an integrated heat exchanger (1000) according to one embodiment of the present invention.
[0047] Hereinafter, an embodiment of the integrated heat exchanger (1000) of the present invention will be described with reference to FIGS. 1 to 3.
[0048] The integrated heat exchanger (1000) has a first plate (100), a second plate (200), a heat exchanger (300), and a receiver dryer (315). The first plate (100) and the second plate (200) form the outermost part of the integrated heat exchanger (1000), and a heat exchanger (300) is provided between them. The heat exchanger (300) includes a first heat exchanger (310), a second heat exchanger (320), and a third heat exchanger (330). The heat exchanger (300) is provided as a single unit.
[0049] In one example, the first heat exchanger (310) is a heat exchanger in which a high-temperature, high-pressure refrigerant exchanges heat with cooling water. In one example, the third heat exchanger (330) is a heat exchanger in which a low-temperature, low-pressure refrigerant exchanges heat with cooling water. In one example, the second heat exchanger (320) is an internal heat exchanger in which heat is exchanged between the refrigerants of the first heat exchanger (310) and the third heat exchanger (330).
[0050] In one example, the first heat exchanger (310) is a heat exchanger in which a refrigerant in a high-temperature, high-pressure state exchanges heat with cooling water. In the first heat exchanger (310), the refrigerant introduced in a high-temperature, high-pressure gaseous state releases heat from a superheated state through heat exchange with cooling water, and the temperature of the refrigerant is lowered and the pressure is reduced, causing it to condense into a liquid state. The first heat exchanger (310) condenses the refrigerant through this process and converts the high-temperature, high-pressure refrigerant into a liquid, making it suitable for refrigerant circulation. In this process, the cooling water is introduced at a relatively low temperature, absorbs heat from the refrigerant, and the temperature of the cooling water rises. The main purpose of the first heat exchanger (310) is to remove the superheat of the refrigerant and condense it to maintain the temperature of the refrigerant at an appropriate level.
[0051] The third heat exchanger (330) is a heat exchanger in which a refrigerant in a low-temperature, low-pressure state exchanges heat with the cooling water. In the third heat exchanger (330), the refrigerant in a low-temperature, low-pressure state absorbs heat through heat exchange with the cooling water, and the refrigerant vaporizes. As the refrigerant exchanges heat with the cooling water, the temperature of the refrigerant rises, and the temperature of the cooling water decreases. The main role of the third heat exchanger (330) is to vaporize the refrigerant and support the cooling water in effectively absorbing heat generated in the system so that the refrigerant can continue to be cooled. The third heat exchanger (330) plays an important role in increasing the cooling efficiency within the system.
[0052] In one example, the first heat exchanger (310) is provided as a water-cooled condenser, the second heat exchanger (320) is provided as a double heat exchanger, and the third heat exchanger (330) is provided as a chiller.
[0053] In the first plate (100), a first refrigerant inlet (111) into which refrigerant flows, a first cooling water inlet (121) into which cooling water flows in and out, and a first cooling water outlet (122) are formed.
[0054] In the second plate (200), a second refrigerant inlet (211) and a second refrigerant outlet (212), and a second cooling water inlet (222) and a second cooling water outlet (221) through which cooling water flows in and out are formed.
[0055] In one example, the integrated heat exchanger (1000) is provided in the form of a plate heat exchanger in which a plurality of plates are stacked. Between plates having a certain thickness, a space formed by combining the plates is provided as a flow path through which fluid can flow, allowing refrigerant and cooling water to flow inside the plate heat exchanger. In one example, the plate heat exchanger is formed by stacking a plurality of flat plates and is configured to include a core in which a heat exchange medium flows through each plate and exchanges heat. Refrigerant or cooling water may flow as a heat exchange medium inside the core, and the core may be configured to allow the refrigerant and cooling water to flow alternately between the stacked plates. The plates may be formed in a rectangular shape, and the rectangular shape may be a rectangular shape in which the length is longer in one direction. Additionally, if necessary, a through hole may be formed at a predetermined location on the plate in a certain area, and a plurality of plates having through holes at the same location may be combined to form a flow path.
[0056] The first heat exchanger (310), the second heat exchanger (320), and the third heat exchanger (330) may be provided with a structure to prevent the fluid in each heat exchange area from crossing over into each other's areas. Additionally, a structure may be provided to allow the fluid to move between each other's areas only in necessary areas.
[0057] In the case of a plate heat exchanger, a multi-layer structure can be used to increase the heat transfer area while minimizing the overall size. In one example, the heat exchanger (300) is formed as a single unit. In one example, the first heat exchanger (310), the second heat exchanger (320), and the third heat exchanger (330) are all provided as a single unit in which multiple plates of the same shape are stacked.
[0058] When the integrated heat exchanger (1000) is provided as a single unit in which each heat exchanger (300) is integrated into a plate-shaped structure, the vertical and horizontal arrangement of the heat exchange system (2000) within the vehicle is possible, thereby greatly improving space efficiency. In addition, maintenance becomes easier. It is easy to replace plates of the same shape, the entire unit can be inspected at once in the event of a problem, and it is easy to inspect and repair sealing parts to resolve leakage or refrigerant leakage issues.
[0059] In one example, the heat exchanger (300) may be manufactured by brazing. Alternatively, the heat exchanger (300) may be joined by welding, bonding, clamping, snap-fit, etc.
[0060] In one example, the first heat exchanger (310) is connected in series with the second heat exchanger (320) and the third heat exchanger (330). In one example, the second heat exchanger (320) and the third heat exchanger (330) are connected in parallel.
[0061] Primary cooling is performed in the first heat exchanger (310), and then cooling is completed through the second heat exchanger (320) and the third heat exchanger (330). The plates provided in the integrated heat exchanger (1000) are designed to be joined together, but each heat exchanger (300) can operate independently within the system.
[0062] In one example, the heat exchange volume of the heat exchanger (300) is provided in the order of the first heat exchanger (310), the third heat exchanger (330), and the second heat exchanger (320). In one example, the size of the heat exchanger (300) is provided in the order of the first heat exchanger (310), the third heat exchanger (330), and the second heat exchanger (320). For example, the volume and cross-sectional area are larger in the order of the first heat exchanger (310), the third heat exchanger (330), and the second heat exchanger (320).
[0063] The first heat exchanger (310) is formed with the largest volume and cross-sectional area to efficiently release a large amount of heat. The third heat exchanger (330) primarily performs the role of removing a large amount of heat through heat exchange between the coolant and the refrigerant. Since the coolant carries a large amount of heat and requires a relatively large heat exchange surface area to cool it efficiently, and the third heat exchanger (330) is designed to handle the main heat source within the vehicle, a high heat exchange capacity is required. Accordingly, the size of the third heat exchanger (330) may be larger than that of the second heat exchanger (320). The second heat exchanger (320) is responsible for heat exchange between the refrigerants and is provided with the smallest size among the three heat exchangers because the heat load is relatively low. This is because, although precision and uniformity are important for heat exchange between the refrigerants in the second heat exchanger (320), a small surface area is sufficient since it does not handle a large amount of heat like the heat exchange between the coolant and the refrigerant.
[0064] In one example, if the surfaces of plates stacked facing each other are referred to as stacking surfaces, the first heat exchanger (310) is formed using the entire surface area of the stacking surface, and the third heat exchanger (330) and the second heat exchanger (320) can each be formed by dividing the surface area of the stacking surface. FIG. 2 is a drawing showing the stacking surfaces of a heat exchanger according to one embodiment of the present invention.
[0065] The area occupied by the first heat exchanger (310) on the stacking surface (310W) is denoted as W0, the area occupied by the second heat exchanger (320) on the stacking surface (320W) is denoted as W1, and the area occupied by the third heat exchanger (330) on the stacking surface (320W) is denoted as W2.
[0066] In one example, a third heat exchanger (330) and a second heat exchanger (320) may be combined to form the entire area of the stacking surface (320W). For instance, the second heat exchanger (320) may occupy a first area (W1) within the stacking surface, and the third heat exchanger (330) may occupy a second area (W2) within the stacking surface, and the first area (W1) and the second area (W2) may be combined to form the entire area of the stacking surface, provided that the first area (W1) is smaller than the second area (W2).
[0067] In one example, the third heat exchanger (330) and the second heat exchanger (320) may be arranged vertically in parallel on the stacking surface of the first heat exchanger (310) and connected in series to the first heat exchanger (310), respectively. In one example, the second heat exchanger (320) may be located above the third heat exchanger (330). This is to allow the refrigerant to flow naturally from the second heat exchanger (320) to the third heat exchanger (330) by gravity, thereby reducing pressure drop, alleviating the load on pumps, etc., and easily discharging residual refrigerant.
[0068] In addition, when the third heat exchanger (330) and the second heat exchanger (320) are configured by vertically stacking them one above the other, space utilization is increased and a compact design is possible. Furthermore, there is an advantage in that the length of the refrigerant transfer path provided for refrigerant flow between the third heat exchanger (330) and the second heat exchanger (320) can be shortened, and path complexity and heat loss are minimized.
[0069] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 3. Hereinafter, the 'path' may be provided as a space formed by a combination of a pipe capable of forming a flow path for cooling water or refrigerant, or a stacked surface of a plate heat exchanger.
[0070] In one embodiment, the 'path' is a space formed by a combination of the stacked surfaces of a plate heat exchanger. The arrows shown in the drawings are intended to indicate the direction of fluid movement and do not imply a space or area through which the fluid flows. Furthermore, the terms "folded" or "U-shaped" are intended to describe the fluid flow or direction, and do not imply that the fluid is supplied to a pipe of this shape.
[0071] In one example, the first heat exchanger (310) is provided as a water-cooled condenser. In the first heat exchanger (310), the refrigerant releases heat and condenses. The first heat exchanger (310) changes the state of the refrigerant through heat exchange between the refrigerant and the cooling water, and the refrigerant undergoes physical changes of superheat removal, condensation, and subcooling in a specific area.
[0072] The first heat exchanger (310) includes a first region (311), a second region (312), a first cooling water path (314), and a first refrigerant path (313). The first heat exchanger (310) is in communication with a first cooling water inlet (121), a first cooling water outlet (122), and a first refrigerant inlet (111) formed on the first plate (100).
[0073] Cooling water flows in and out of the first heat exchanger (310) through the first cooling water inlet (121) and the first cooling water outlet (122), and refrigerant flows into the first heat exchanger (310) through the first refrigerant inlet (111). In one example, the first cooling water inlet (121) may be located at a position corresponding to the lower part of the first heat exchanger (310), and the first cooling water outlet (122) and the first refrigerant inlet (111) may be located at positions corresponding to the upper part.
[0074] The cooling water moves upward inside the first heat exchanger (310) by the force of a pump or the like, and performs heat exchange with the refrigerant. The refrigerant moves from top to bottom inside the first heat exchanger (310). Since the refrigerant moves downward along gravity, the energy required for the refrigerant flow is minimized. In addition, the cooling water and the refrigerant are arranged so that their directions of movement are opposite, thereby enabling counter-flow heat exchange between the cooling water and the refrigerant.
[0075] The first cooling water inlet (121), the first cooling water outlet (122), and the first refrigerant inlet (111) are connected to the first area (311). In one example, the first area (311), the second area (312), and the receiver dryer (315) are connected, and the receiver dryer (315), the first area (311), and the second area (312) are arranged sequentially.
[0076] The first cooling water path (314) is provided in the first area (311) and forms a cooling water path connecting the first cooling water inlet (121) and the first cooling water outlet (122). The first refrigerant path (313) is formed in the first area (311) and the second area (312) and forms a refrigerant path connecting the first refrigerant inlet (111) and the second heat exchanger (320).
[0077] In one example, the first cooling water path (314) has a U-shape such that the direction of movement of the cooling water is opposite to the path of the cooling water flowing in through the first cooling water inlet (121) and the path of the cooling water flowing out through the first cooling water outlet (122).
[0078] In one example, the first refrigerant path (313) may have a shape that is bent in multiple areas so that it can move sequentially through the receiver dryer (315), the first area (311), and the second area (312) in the order of the first area (311), the receiver dryer (315), and the second area (312). In one example, the first refrigerant path (313) is positioned adjacent to the first cooling water path (314) and is arranged along the inner and outer edges of the first cooling water path (314). The first refrigerant path (313) and the first cooling water path (314) are adjacent, and the first refrigerant path (313) is provided to surround the first cooling water path (314) so that heat exchange between the refrigerant and the cooling water is facilitated.
[0079] In the first region (311), superheat removal and condensation of the refrigerant are performed, in the second region (312), subcooling of the refrigerant is performed, and in the receiver dryer (315), gas-liquid separation of the refrigerant is performed and foreign substances are removed. In one example, the receiver dryer (315) may not be provided as necessary.
[0080] In the first region (311), heat is removed from the superheated refrigerant that has entered in a high-temperature, high-pressure gaseous state. The superheated refrigerant releases excess heat through heat exchange with the cooling water before entering the condensation process. At this time, since the cooling water maintains a relatively low temperature, the cooling water absorbs the excess heat of the refrigerant, causing the temperature of the refrigerant to decrease and drop to an appropriate temperature. The refrigerant that has undergone the superheat removal process continues to transfer heat to the cooling water and condenses into a liquid. Through the superheat removal and condensation processes, the refrigerant changes from a high-temperature, high-pressure gas into a relatively low-temperature liquid.
[0081] The refrigerant passing through the first region (311) flows into the receiver dryer (315). In one example, the first refrigerant flows into the first region (311) from the upper part of the first heat exchanger (310) through the first refrigerant inlet (111), and the first region (311) and the receiver dryer (315) are connected at the lower part of the first region (311).
[0082] In one example, the receiver dryer (315) may be provided in a structure separable from the first area (311) and the second area (312). Alternatively, the receiver dryer (315) may be provided integrally with the first area (311) and the second area (312). In one example, the receiver dryer (315) may be mounted on the first plate (100) so as to be in communication with the first area (311). That is, the receiver dryer (315) may be provided outside the first heat exchanger (310). In one example, the receiver dryer (315) may be provided at a position facing the second area (312) with respect to the first area (311).
[0083] In one example, the receiver dryer (315) may include a desiccant and a filter. The refrigerant introduced into the receiver dryer (315) has moisture removed by the desiccant and the like, and impurities removed by the filter.
[0084] The refrigerant passing through the receiver dryer (315) flows into the second region (312) through the lower part of the second region (312). In the second region (312), the refrigerant moves to the upper part of the second region (312) adjacent to the cooling water flow path, and the refrigerant is subcooled and becomes a liquid state. Subcooling refers to the process in which the refrigerant is cooled to a temperature lower than the condensation point. The refrigerant passing through the second region (312) flows into the second heat exchanger (320).
[0085] The second region (312) is located adjacent to the second heat exchanger (320) and the third heat exchanger (330).
[0086] The second heat exchanger (320) includes a second refrigerant path (323) and a third refrigerant path (325). The second heat exchanger (320) is in communication with a second refrigerant inlet (211), a first refrigerant outlet (not shown), and a second refrigerant outlet (212). In one example, the second refrigerant inlet (211) is connected to an evaporator (2110) described later, and the second refrigerant outlet (212) is connected to a compressor (2200) described later (see FIG. 8). In one example, the first refrigerant outlet (not shown) is formed in the third heat exchanger expansion section (335) described later, and the first refrigerant outlet (not shown) is in communication with a thermal expansion valve (2013) described later (see FIG. 8). In addition, the second cooling water inlet (222) and the second cooling water outlet (221) are connected to the reservoir (2400) described later (see FIG. 8).
[0087] In one example, heat exchange is performed between the refrigerant flowing through the second refrigerant path (323) and the refrigerant flowing through the third refrigerant path (325) within the second heat exchanger (320). Additionally, the second heat exchanger (320) is connected in parallel with the third heat exchanger (330) and in series with the first heat exchanger (310) to assist in the heat circulation of the entire system.
[0088] In one example, the second refrigerant path (323) is provided to connect the first region (311) and the first refrigerant outlet (not shown). In one example, the second refrigerant path (323) has one side communicating with the first region (311) located at the top of the second region (312), extends in a straight line along the interior of the second region (312), then bends at the opposite corner of the side and continues downward, and then bends again to finally connect to the first refrigerant outlet (not shown) formed in the third heat exchanger expansion section (335).
[0089] In one example, the second heat exchanger (320) is kept in a superheated state before the refrigerant flows into the compressor (2200) through the third refrigerant path (325).
[0090] In one example, the third refrigerant path (325) connects the second refrigerant inlet (211) connected to the evaporator (2110) and the second refrigerant outlet (212) connected to the compressor (2200) in a U-shape. By forming a U-shape, the third refrigerant path (325) facilitates smooth heat exchange with the refrigerant within the second refrigerant path (323). In one example, the second refrigerant inlet (211) is located above the first refrigerant outlet (not shown), and the second refrigerant outlet (212) is located above the second refrigerant inlet (211). In one example, the second refrigerant outlet (212) is located above the second heat exchanger (320). In one example, the first refrigerant outlet (not shown) is located below the second heat exchanger (320). The first refrigerant outlet (not shown) may be provided at the bottom of the second heat exchanger (320) to shorten the length of the transfer section (3352) described later.
[0091] The third heat exchanger (330) includes a second cooling water path (334), a fourth refrigerant path (333), and a third heat exchanger expansion section (335). The third heat exchanger (330) is a device that performs heat exchange between the cooling water and the refrigerant and is responsible for lowering the temperature of the cooling water within the system.
[0092] In one example, the second cooling water inlet (222) is positioned corresponding to the upper part of the third heat exchanger (330), and the second cooling water outlet (221) is positioned corresponding to the lower part of the third heat exchanger (330). The second cooling water path (334) connects the second cooling water inlet (222) and the second cooling water outlet (221) in a U-shape.
[0093] In one example, the inlet of the expansion section (335) of the third heat exchanger (330) is connected to the outlet of the second heat exchanger (320), and the outlet of the expansion section (335) is connected to the inlet of the third heat exchanger (330). In one example, the refrigerant passing through the second heat exchanger (320) is branched at a branching point, where a portion of the refrigerant is discharged to the outside through the first refrigerant outlet, and the remainder is introduced into the third heat exchanger (330). In one example, the branching point is provided within the expansion section (335) of the third heat exchanger (330).
[0094] In one example, the fourth refrigerant path (333) branches off from a predetermined branch point of the second refrigerant path (323) of the second heat exchanger (320). For example, some of the refrigerant in the second refrigerant path (323) flows into the expansion valve, and some flows into the third heat exchanger (330) through the fourth refrigerant path (333).
[0095] In one example, the branch point is located upstream of the first refrigerant outlet (not shown) and adjacent to the first refrigerant outlet (not shown). The refrigerant flowing into the fourth refrigerant path (333) at the branch point is expanded through the third heat exchanger expansion section (335) before flowing into the third heat exchanger (330).
[0096] In one example, the third heat exchanger expansion section (335) includes an expansion section (3351) including an expansion valve and a transfer section (3352). In one example, the expansion section (3351) and the transfer section (3352) are arranged sequentially. That is, the transfer section (3352) is placed at the rear end of the expansion section (3351). In one example, the expansion section (3351) is located between the second heat exchanger (320) and the third heat exchanger (330). For example, the expansion section (3351) is mounted on the second plate (200) so as to extend from the lower part of the second heat exchanger (320) to the upper part of the third heat exchanger (330). In one example, the expansion section (3351) is provided at the rear end of the second refrigerant path (323), and the branch point is located within the third heat exchanger expansion section (335). In one example, a first refrigerant outlet (not shown) is formed in the third heat exchanger expansion section (335).
[0097] In one example, the transfer unit (3352) may be provided inside the third heat exchanger (330) or located outside the third heat exchanger (330) adjacent to the third heat exchanger (330).
[0098] In one example, as illustrated in FIG. 3, the transfer section (3352) may be provided in the form of being part of the fourth refrigerant path (333) inside the third heat exchanger (330). In one example, the transfer section (3352) may be provided to connect the upper and lower parts of the third heat exchanger (330). The refrigerant expanded through the third heat exchanger expansion section (335) moves upward inside the third heat exchanger (330) through the fourth refrigerant path (333) and is combined with the third refrigerant path (325).
[0099] In the example described above, each path was given a name, but this is for the convenience of explanation and does not imply that each path is formed as a separate entity.
[0100] FIGS. 4 and FIGS. 5 are schematic drawings showing a perspective view and an internal view of a heat exchanger (300) according to another embodiment of the present invention, respectively.
[0101] In another example, as illustrated in FIGS. 4 and 5, the transfer section (3352) may be provided outside the third heat exchanger (330). In the case of the embodiment disclosed in FIG. 3, if the refrigerant is transferred inside the third heat exchanger (330), the pressure loss of the refrigerant may be excessive. To prevent this, the transfer section (3352) is configured outside the third heat exchanger (330). In one example, the transfer section (3352) may be provided in the form of a flow path formed inside the second plate (200). For example, the transfer section (3352) may be formed by processing the second plate (200) so that when the second plate (200) is viewed from the side of the third heat exchanger (330), it is concave with an intaglio pattern, and when viewed from the outside, a protruding shape appears. Alternatively, the transfer section (3352) may be mounted in the form of a pipe on the second plate (200).
[0102] FIGS. 6 and FIGS. 7 are schematic drawings showing a perspective view and an internal view of a heat exchanger (300) according to another embodiment of the present invention, respectively.
[0103] In one example, the fourth refrigerant path (333) branches off from the branching point of the second refrigerant path (323) of the second heat exchanger (320). For example, some of the refrigerant in the second refrigerant path (323) flows into the thermal expansion valve (2013), and some flows into the third heat exchanger (330) through the fourth refrigerant path (333).
[0104] In one example, the branch point is located upstream of the first refrigerant outlet (not shown) and adjacent to the first refrigerant outlet (not shown). The refrigerant flowing into the fourth refrigerant path (333) at the branch point is expanded through the third heat exchanger expansion section (335) before flowing into the third heat exchanger (330).
[0105] In one example, the third heat exchanger expansion section (335) includes an expansion section (3351) and a transfer section (3352). In one example, the transfer section (3352) and the expansion section (3351) are arranged sequentially. That is, the expansion section (3351) is placed at the rear end of the transfer section (3352). This is to transfer and expand the refrigerant first. In this way, transferring and expanding the refrigerant first has the advantage of causing less pressure loss compared to moving the refrigerant after the expansion has taken place.
[0106] In one example, the expansion section (3351) is located at the bottom of the third heat exchanger (330). In one example, the expansion section (3351) is provided at the rear end of the second refrigerant path (323), and the branch point is located within the third heat exchanger expansion section (335). In one example, the first refrigerant outlet (not shown) is formed in the third heat exchanger expansion section (335).
[0107] In one example, the transfer unit (3352) may be provided inside the third heat exchanger (330) or located outside the third heat exchanger (330) adjacent to the third heat exchanger (330).
[0108] In one example, the transfer section (3352) may be provided to connect the lower part of the second heat exchanger (320) and the lower part of the third heat exchanger (330). The refrigerant expanded through the third heat exchanger expansion section (335) moves upward inside the third heat exchanger (330) through the fourth refrigerant path (333) and is combined with the third refrigerant path (325).
[0109] In addition, the present invention provides a heat exchange system (2000) comprising the integrated heat exchanger (1000) described above.
[0110] FIG. 8 shows a schematic diagram of a heat exchange system (2000) according to one embodiment of the present invention. Referring to FIG. 8, the heat exchange system (2000) includes an integrated heat exchanger (1000), an air conditioning case (2100), a first cooling water line (2011), a first refrigerant line (2001), a second refrigerant line (2002), a second cooling water line (2012), etc.
[0111] The integrated heat exchanger (1000) is a heat exchanger in which the first heat exchanger (310), the second heat exchanger (320), and the third heat exchanger (330) described above are combined, and is provided to allow the first cooling water line (2011), the first refrigerant line (2001), the second refrigerant line (2002), and the second cooling water line (2012) to pass through.
[0112] An air conditioning case (2100) is a device for cooling, heating, or dehumidifying the air inside a vehicle. In one example, the air conditioning case (2100) includes an evaporator (2110) and an inner condenser (2120). The evaporator (2110) is located at the beginning of the air intake path of the air conditioning case (2100) to cool and dehumidify the air entering the interior. The inner condenser (2120) heats the air by releasing heat from the refrigerant during heating. The inner condenser (2120) performs the opposite function to the evaporator (2110). The air is heated as the refrigerant, in a high-temperature and high-pressure state, passes through the inner condenser (2120) and releases heat. In one example, the air conditioning case (2100) may additionally be equipped with a heater (2130). The heater (2130) further heats the air heated in the inner condenser (2120) or performs independent heating.
[0113] In one example, a reservoir (2400), a first pump (2401), an electrical module (2600), a first heat exchanger (310), and a forward heat exchanger (2500) are arranged in the first cooling water line (2011).
[0114] Coolant is stored in the reservoir (2400). In one example, the reservoir (2400) is equipped with a hexa-valve (2402) to control the flow of the coolant. The coolant stored in the reservoir (2400) is circulated by the first pump (2401). The coolant starts from the reservoir (2400) and flows into the electrical module (2600) to absorb the heat generated in the electrical module (2600). In one example, the electrical module (2600) may include an inverter, a motor, a power converter, etc.
[0115] The cooling water that has passed through the electrical module (2600) flows into the first heat exchanger (310), and the first heat exchanger (310) uses the cooling water to convert the high-temperature, high-pressure refrigerant into a liquid state.
[0116] The coolant passing through the first heat exchanger (310) flows into the front heat exchanger (2500). The front heat exchanger (2500) is positioned at the front of the vehicle and is provided with a radiator (2501) and a blower (2502). The radiator (2501) is prepared to recirculate the coolant by releasing the heat absorbed from the coolant to the outside air.
[0117] In the first refrigerant line (2001), an air conditioning case (2100), a first heat exchanger (310), a second heat exchanger (320), and a thermal expansion valve (2013) are arranged.
[0118] When high-temperature, high-pressure refrigerant flows from the inner condenser (2120) of the air conditioning case (2100) into the first heat exchanger (310), the refrigerant is condensed into a liquid through heat exchange with the cooling water of the first cooling water line (2011) in the first heat exchanger (310). The cooled liquid refrigerant flows into the second heat exchanger (320).
[0119] In the second heat exchanger (320), heat exchange takes place between the refrigerant of the second refrigerant line (2002), which will be described later, and the refrigerant of the first refrigerant line (2001). The refrigerant of the second refrigerant line (2002) passes through the evaporator (2110) and is in a state where its temperature has been lowered. Accordingly, the refrigerant of the first refrigerant line (2001) is further lowered in the second heat exchanger (320) following the first heat exchanger (310).
[0120] A portion of the refrigerant that has passed through the second heat exchanger (320) from the first refrigerant line (2001) flows into the thermal expansion valve (2013) to undergo expansion and then flows into the evaporator (2110), while the remainder flows into the third heat exchanger expansion valve (2015) through the refrigerant branch line (2051). As the liquid refrigerant evaporates in the evaporator (2110), it absorbs heat from the surroundings, and the evaporated refrigerant is moved to the second refrigerant line (2002). In one example, the refrigerant flow rate of the first refrigerant line (2001) can be controlled by the thermal expansion valve (2013) provided upstream of the evaporator (2110). In one example, the thermal expansion valve (2013) may be an electronic solenoid valve.
[0121] In the second refrigerant line (2002), an evaporator (2110), a third heat exchanger (330), a second heat exchanger (320), an accumulator (2220), and a compressor (2200) are arranged. The refrigerant flowing into the evaporator (2110) through the first refrigerant line (2001) is in a low-temperature, low-pressure state. This refrigerant changes into a gas while absorbing heat from the surroundings as it evaporates inside the evaporator (2110). The refrigerant that has changed into a gas flows into the third heat exchanger (330) and the second heat exchanger (320) through the second refrigerant line (2002). The second refrigerant line (2002) branches off between the third heat exchanger (330) and the second heat exchanger (320). Refrigerant is introduced from the evaporator (2110) to the third heat exchanger (330) through the first branch line (2005), and refrigerant is introduced from the evaporator (2110) to the second heat exchanger (320) through the second branch line (2006).
[0122] The refrigerant flowing into the third heat exchanger (330) exchanges heat with the cooling water and absorbs additional heat, causing its temperature to drop further, while the refrigerant flowing into the second heat exchanger (320) exchanges heat with the first refrigerant line (2001). Afterward, the refrigerants passing through the third heat exchanger (330) and the second heat exchanger (320) are each collected in an accumulator (2220) to remove excess liquid refrigerant, then move to a compressor (2200) to be compressed into a high-temperature, high-pressure gaseous state. The compressed refrigerant then flows back into the first heat exchanger (310) to prepare for the next stage of the circulation process.
[0123] In the first branch line (2005), a third heat exchanger expansion valve (2015) is provided to form the expansion section (3351) described above at the downstream end of the third heat exchanger (330). The refrigerant passing through the third heat exchanger expansion valve (2015) is combined with the refrigerant passing through the second heat exchanger (320) at the upstream end of the accumulator (2220).
[0124] In the second cooling water line (2012), a reservoir (2400), a second pump (2403), a third heat exchanger (330), and a battery (2300) are arranged. The third heat exchanger (330) lowers the temperature of the cooling water so that the heat generated in the battery (2300) is removed by the cooling water.
[0125] In the present invention, a first heat exchanger (310), a second heat exchanger (320), and a third heat exchanger (330) are provided as a single unit and combined in the form of a plate heat exchanger.
[0126] Accordingly, this offers the advantages of simplified packaging, optimized heat exchanger combination and placement, and significantly improved installation simplification and space efficiency. Additionally, the integrated unit increases ease of installation and maintenance, and reduces the overall system volume and weight.
[0127] In addition, there is an advantage in that each heat exchanger can be combined to improve air conditioning and cooling performance.
[0128] In addition, in the integrated heat exchanger unit, each heat exchanger component can be connected through a single sealing system, which has the advantage of reducing the possibility of refrigerant leakage at the connection points.
[0129] Although preferred embodiments of the present invention have been described above, the embodiments disclosed in the present invention are intended only to illustrate, not to limit, the technical scope of the present invention. Accordingly, the technical scope of the present invention includes not only each disclosed embodiment but also combinations of the disclosed embodiments, and furthermore, the scope of the technical scope of the present invention is not limited by such embodiments. In addition, a person skilled in the art to which the present invention pertains can make numerous changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications should be deemed to fall within the scope of the present invention as equivalents. Explanation of the symbols
[0131] 1000: Integrated heat exchanger 100: First plate 111: First refrigerant inlet 121: First coolant inlet 122: Second coolant outlet 200: Second plate 211: Second refrigerant inlet 212: Second refrigerant outlet 221: Second coolant outlet 222: Second coolant inlet 300: Heat exchanger 310: First heat exchanger 311: First Zone 312: Second Zone 313: First refrigerant path 314: 1st Coolant Path 315: Receiver Dryer 320: Second heat exchanger 323: Second refrigerant path 325: Third refrigerant path 330: 3rd heat exchanger 333: 4th Refrigerant Path 334: Second Coolant Path 335: Expansion part
Claims
Claim 1 An integrated heat exchanger comprising a heat exchanger provided as a single unit having stacked plate-shaped heat exchangers, wherein the heat exchanger comprises: a first heat exchanger; a second heat exchanger communicating with and coupled to the first heat exchanger; and a third heat exchanger coupled to the first heat exchanger and the second heat exchanger and communicating with the second heat exchanger, wherein the second heat exchanger and the third heat exchanger are arranged in parallel in the height direction of the first heat exchanger, and the heat exchange amount of the heat exchanger is provided in the order of the first heat exchanger, the third heat exchanger, and the second heat exchanger. Claim 2 An integrated heat exchanger according to claim 1, wherein the second heat exchanger and the third heat exchanger are arranged vertically and connected in parallel with each other, and the first heat exchanger is connected in series with the second heat exchanger and the third heat exchanger, respectively. Claim 3 In paragraph 2, the first heat exchanger is provided as the entire area of the stacking surface of the plate-shaped heat exchanger, and the second heat exchanger and the third heat exchanger are provided by dividing the stacking surface, wherein the second heat exchanger occupies a first area within the stacking surface and the third heat exchanger occupies a second area within the stacking surface, and the first area and the second area are combined to form the entire area of the stacking surface, wherein the first area is provided as being smaller than the second area, an integrated heat exchanger. Claim 4 In paragraph 2, the second heat exchanger is an integrated heat exchanger positioned above the third heat exchanger. Claim 5 An integrated heat exchanger according to claim 1, wherein the first heat exchanger is a heat exchanger that exchanges heat between a high-temperature, high-pressure refrigerant and cooling water, the third heat exchanger is a heat exchanger that exchanges heat between a low-temperature, low-pressure refrigerant and cooling water, and the second heat exchanger is an internal heat exchanger that exchanges heat between the refrigerant of the first heat exchanger and the refrigerant of the third heat exchanger. Claim 6 In claim 5, the first heat exchanger is provided as a condenser that condenses the refrigerant into a low-temperature liquid state through heat exchange between the high-temperature, high-pressure gaseous refrigerant and the cooling water, the second heat exchanger is provided as a double heat exchanger that performs heat exchange between refrigerants in separate flow paths, and the third heat exchanger is provided as a chiller that lowers the temperature of the cooling water through heat exchange between the refrigerant and the cooling water, an integrated heat exchanger. Claim 7 An integrated heat exchanger according to any one of claims 1 to 6, further comprising a first plate and a second plate coupled to the heat exchanger with the heat exchanger in between, wherein the first plate is coupled to the first heat exchanger and has a first refrigerant inlet for refrigerant to flow in, a first cooling water inlet for cooling water to flow in and out, and a first cooling water outlet formed therein, and the second plate is coupled to the second heat exchanger and the third heat exchanger and has a second refrigerant inlet and a second refrigerant outlet, and a second cooling water inlet and a second cooling water outlet for cooling water to flow in and out formed therein. Claim 8 In claim 7, the first heat exchanger is a heat exchanger that exchanges heat with high temperature and high pressure refrigerant and cooling water, the third heat exchanger is a heat exchanger that exchanges heat with low temperature and low pressure refrigerant and cooling water, the second heat exchanger is an internal heat exchanger that exchanges heat between the refrigerant of the first heat exchanger and the refrigerant of the third heat exchanger, and the low temperature and low pressure refrigerant that has passed through the third heat exchanger flows into the second heat exchanger and is combined with the low temperature and low pressure refrigerant flowing into the second refrigerant inlet to exchange heat with the high temperature and high pressure refrigerant, forming an integrated heat exchanger. Claim 9 In claim 8, the third heat exchanger further comprises a third heat exchanger expansion section for expanding the refrigerant discharged from the second heat exchanger and introducing it into the interior of the third heat exchanger, wherein the third heat exchanger expansion section expands the refrigerant through an expansion valve and is in communication with a first refrigerant outlet extending from the first refrigerant inlet and a transfer section; and a transfer section providing a transfer path for the refrigerant before expansion or the refrigerant after expansion, an integrated heat exchanger. Claim 10 In claim 9, an integrated heat exchanger in which the inlet of the expansion section of the third heat exchanger is in communication with the outlet of the second heat exchanger, and the outlet of the expansion section is in communication with the inlet of the third heat exchanger. Claim 11 An integrated heat exchanger according to claim 9, wherein the refrigerant passing through the second heat exchanger branches off at a branching point, wherein at the branching point, a portion of the refrigerant flows out to the outside through the first refrigerant outlet and the remainder flows into the third heat exchanger. Claim 12 In paragraph 11, the branch point is an integrated heat exchanger provided within the expansion section of the third heat exchanger. Claim 13 An integrated heat exchanger according to claim 9, wherein the transfer section is positioned at the rear end of the expansion section, the expansion section extends from the lower part of the second heat exchanger to the upper part of the third heat exchanger, and the transfer section extends from the upper part of the third heat exchanger to the lower part of the third heat exchanger. Claim 14 An integrated heat exchanger according to claim 9, wherein the expansion portion is positioned at the rear end of the transfer portion, the transfer portion extends from the lower part of the second heat exchanger to the lower part of the third heat exchanger, and the expansion portion is provided at the lower part of the third heat exchanger. Claim 15 In claim 9, the transfer unit is an integrated heat exchanger provided inside the third heat exchanger. Claim 16 In claim 9, the transfer section is provided as an intaglio-shaped flow path adjacent to the third heat exchanger on the inner side of the second plate, in an integrated heat exchanger. Claim 17 In claim 9, the transfer portion is provided in the form of a pipe that is coupled to an area corresponding to the third heat exchanger on the outer side of the second plate, an integrated heat exchanger. Claim 18 In claim 9, the first heat exchanger comprises: a first region in communication with a first cooling water inlet, a first cooling water outlet, a receiver dryer performing gas-liquid separation of the refrigerant, and a first refrigerant inlet, where the refrigerant is condensed; a second region in communication with the first region and the second heat exchanger, provided adjacent to the second heat exchanger and the third heat exchanger, where the refrigerant is subcooled; a first cooling water passage forming a cooling water flow path connecting the first cooling water inlet and the first cooling water outlet in a U-shape within the first region; and a first refrigerant passage forming a refrigerant flow path connecting the first refrigerant inlet and the second heat exchanger within the first region, the receiver dryer, and the second region, provided adjacent to the first cooling water passage, wherein the first cooling water passage and the first refrigerant passage are provided such that the direction of movement of the refrigerant and the direction of movement of the cooling water within the first region are opposite directions, an integrated heat exchanger. Claim 19 In claim 18, the second heat exchanger comprises: a second refrigerant passage extending from the first refrigerant passage to the first refrigerant outlet; a third refrigerant passage connecting the second refrigerant inlet and the second refrigerant outlet in a U-shape within the second heat exchanger; and the third heat exchanger comprises: a second cooling water passage connecting the second cooling water inlet and the second cooling water outlet in a U-shape; and a fourth refrigerant passage for combining the refrigerant introduced from the expansion section with the third refrigerant passage, an integrated heat exchanger. Claim 20 A heat exchange system comprising an integrated heat exchanger of claim 1, comprising: a reservoir in which coolant is stored, an electrical module, a first heat exchanger, and a front heat exchanger of a vehicle are arranged in a first coolant line through which coolant circulates; a first refrigerant line through which refrigerant flows, wherein an inner condenser in an air conditioning case for controlling air inside a vehicle, the first heat exchanger, the second heat exchanger, and a thermal expansion valve are arranged; a second refrigerant line through which refrigerant flows, wherein an evaporator in the air conditioning case, the third heat exchanger, the second heat exchanger, and a compressor are arranged; a second coolant line through which coolant circulates, wherein the third heat exchanger and a battery are arranged in a second coolant line through which coolant circulates; and a first branch line and a second branch line that branch off from the second refrigerant line between the third heat exchanger and the second heat exchanger and merge at the front end of the compressor, wherein the third heat exchanger and the third heat exchanger expansion valve are arranged in the first branch line and the second heat exchanger is arranged in the second branch line.