Heat Exchange Unit

Abstract

The heat exchange unit includes a first heat exchange section, a bridge, and a second heat exchange section, at least a portion of the bridge being located between the first heat exchange section and the second heat exchange section, the bridge including two holes or grooves facing the first heat exchange section and communicating with the first heat exchange section, the bridge including two holes or grooves facing the second heat exchange section and communicating with the second heat exchange section, the bridge further including a third connection port section having a third connection port, the bridge including holes and / or grooves communicating with the third connection port, the bridge making it relatively easy to realize a fluid communication method between the two heat exchange sections, which can be realized by changing the structure of the bridge according to different system requirements, simplifying the system piping and reducing the installation of piping between the connection ports, and making the system connection simple and convenient.

Description

[Technical field]

[0001] This application claims priority to a Chinese patent application filed with the China Patent Office on July 25, 2020, bearing application number 202010726730.5, and entitled "Heat Exchange Unit and Vehicle Thermal Management System," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of fluid control, and in particular to heat exchange units. [Background technology]

[0003] The thermal management system includes two or more heat exchangers, such as plate evaporators, and these heat exchangers and components are generally connected through piping and fixedly installed in the thermal management system. In addition, because there are many components in the thermal management system, the piping connections of the thermal management system are also relatively complicated. Summary of the Invention [Problem to be solved by the invention]

[0004] It is an object of the present invention to provide a heat exchange unit which is relatively simple to connect in the case of connection to a thermal management system. [Means for solving the problem]

[0005] The heat exchange unit of the present invention includes a first heat exchange section, a bridge, and a second heat exchange section, the bridge being at least partially located between the first heat exchange section and the second heat exchange section, the first heat exchange section, the bridge, and the second heat exchange section being fixed by welding, and the first heat exchange section including a heat exchange core and at least two fluid flow paths that are not in communication with each other. The heat exchange unit includes a first connection port, a second connection port, and a third connection port, the first heat exchange section includes a first connection port section and a second connection port section, the first connection port section has the first connection port, the second connection port section has the second connection port, and the bridge includes a third connection port section in which the third connection port is provided. Furthermore, the bridge includes a hole and / or groove communicating with the third connection port, and the hole and / or groove communicating with the third connection port in the bridge communicates with at least a communication hole passage of one of the first heat exchange section and the second heat exchange section, the bridge includes two communication holes or grooves facing the first heat exchange section, the bridge includes at least two holes or grooves that can communicate with the second heat exchange section, and the mouth of the hole or groove that can communicate with the second heat exchange section of the bridge faces the second heat exchange section.

[0006] The flow path in this specification includes a flow path possessed by a single part, and also includes a flow path formed by combining two or more components. For example, the sixth connection port communicating with the fourth connection port via a flow path includes communication through a flow path via the connecting member itself, communication through a flow path formed from the connecting member toward the space in which the groove of the second heat exchange part is located after the connecting member is fixed to the second heat exchange part, communication through a flow path formed by a space recessed inwardly of the second heat exchange part after the connecting member is fixed to the second heat exchange part, communication through a flow path formed by combining the connecting member with the second heat exchange part and another component, etc. The communicating holes and / or grooves facing the first heat exchange section include various types, namely, communicating holes, communicating grooves, hole-to-groove combinations, hole-to-hole combinations, groove-to-groove combinations, and more combinations. The same is true for the holes and / or grooves communicating with the second heat exchange section, and may be holes communicating with the second heat exchange section, grooves communicating with the second heat exchange section, or holes, grooves communicating with the second heat exchange section. Communication includes both direct and indirect communication situations. The bridge also includes two holes or grooves for communication facing or adjacent to the first heat exchange section, and the bridge includes at least two holes and / or grooves that can communicate with the second heat exchange section. Furthermore, it is not excluded that the holes or grooves for communication facing or adjacent to the first heat exchange section can also be applied to communication with the second heat exchange section, and if they are in the form of through holes, they can simultaneously face the first heat exchange section and also face the second heat exchange section and communicate with the second heat exchange section. The fact that the two are in communication with each other via a pipe or something is not a closed description in this specification, but rather refers to the two being in communication with each other, and also includes various possibilities of further having other components between the two, such as a throttling element, a separator, a control valve, a check valve, a heat exchanger, etc.

[0007] Such a bridge makes it relatively convenient to realize fluid communication between the two heat exchange parts, which can be realized by changing the structure of the bridge when different system requirements arise, simplifies the system piping, reduces the installation of piping between the connection ports, makes the system connection simple and convenient, and also, the provision of a third connection port part on the bridge can reduce the number of connection ports of other components. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of a heat exchange unit according to a first embodiment of the present invention; [Diagram 2] 1 is a perspective view of a heat exchange unit according to a first embodiment of the present invention; [Diagram 3] FIG. 2 is a front view of the heat exchange unit of FIG. 1; [Figure 4] FIG. 4 is a cross-sectional view of the heat exchange unit of FIG. 3 taken along the line A-A. [Diagram 5] Exploded view of the heat exchange unit. [Figure 6] FIG. [Figure 7] FIG. 7 is a front view of the bridge in FIG. 6 and cross-sectional views in the B-B direction and the C-C direction. [Figure 8] FIG. 4 is a perspective view of a connection member in the heat exchange unit. [Figure 9] FIG. 4 is a perspective view of a connection member in the heat exchange unit. [Figure 10] FIG. 13 is a perspective view of a bridge in a heat exchange unit according to another embodiment. [Figure 11] FIG. 13 is a perspective view of a bridge in a heat exchange unit according to another embodiment. [Figure 12] FIG. 11 is a perspective view of a heat exchange unit according to a second embodiment. [Figure 13] FIG. 11 is a perspective view of a heat exchange unit according to a second embodiment. [Figure 14] FIG. 13 is an exploded view of the heat exchange unit of FIG. [Figure 15] 13A and 13B are perspective views of the bridge in the heat exchange unit of FIG. 12 as viewed from two directions. [Figure 16] FIG. 16 is a front view of the bridge of FIG. [Figure 17] 13 is an exploded view of a connecting member in the heat exchange unit of FIG. 12. [Figure 18] FIG. 11 is a perspective view of a heat exchange unit according to a third embodiment. [Figure 19] FIG. 11 is a perspective view of a heat exchange unit according to a third embodiment. [Figure 20] 18 and 19. FIG. 19 is a diagram of a bridge in the heat exchange unit. [Figure 21] 18 and 19 are exploded views of the heat exchange unit. [Figure 22] 20 is a perspective view of a connection member in the heat exchange unit of FIG. 18 and FIG. 19. [Diagram 23] 23 is a view of the connection block of the connection member of FIG. 22 in the forward direction. [Figure 24] 23 is a view of the connecting block of the connecting member of FIG. 22 in the reverse direction. [Diagram 25] FIG. 13 is a perspective view of a heat exchange unit according to a fourth embodiment. [Figure 26] FIG. 26 is an exploded view of the heat exchange unit of FIG. [Figure 27] FIG. 26 is a perspective view of a bridge in the heat exchange unit of FIG. 25 . [Figure 28] 28 is a front view of the bridge in FIG. 27 and cross-sectional views in the E-E direction and the D-D direction. [Figure 29]FIG. 13 is a perspective view of a heat exchange unit according to a fifth embodiment. [Diagram 30] FIG. 30 is an exploded view of the heat exchange unit of FIG. 29. [Diagram 31] FIG. 30 is a diagram of a bridge in the heat exchange unit of FIG. 29. [Diagram 32] 32 is a view of the bridge in another direction of FIG. 31 and cross-sectional views in the directions G-G and F-F. [Diagram 33] FIG. 13 is a perspective view of a heat exchange unit according to a sixth embodiment. [Diagram 34] 34 is an exploded view of the heat exchange unit of FIG. 33. [Diagram 35] 34A and 34B are perspective views of the bridge in the heat exchange unit of FIG. 33 as viewed from two directions. [Diagram 36] 36 is a front view and a back view of the bridge of FIG. 35. [Figure 37] 34 is a perspective view of a connecting member in the heat exchange unit of FIG. 33 as viewed from two directions. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The following describes the present invention based on specific embodiments. Referring to Figures 1 to 9, Figures 1 and 2 are oblique views of a heat exchange unit which is a first embodiment of the present invention, Figure 3 is a front view of the heat exchange unit, Figure 4 is a cross-sectional view in the A-A direction of the heat exchange unit of Figure 3, Figure 5 is an exploded view of the heat exchange unit, Figure 6 is an oblique view of a bridge in the heat exchange unit, Figure 7 is a front view and cross-sectional views in the B-B direction and CC direction of the bridge of Figure 6, and Figures 8 and 9 are oblique views of connecting members in the heat exchange unit. As shown in the figure, the heat exchange unit includes a first heat exchange section 10, a throttle element 110, a bridge 20, a second heat exchange section 30 and a connecting member 40. The bridge 20 is located between the first heat exchange section 10 and the second heat exchange section 30, and the connecting member 40 is located on the other side of the second heat exchange section 30, i.e., the bridge 20 and the connecting member 40 are respectively provided on both sides of the second heat exchange section, and the first heat exchange section 10, the bridge 20 and the second heat exchange section 30 are fixed by welding, or the first heat exchange section 10, the bridge 20, the second heat exchange section 30 and the connecting member are fixed by welding.

[0010] The first heat exchange section 10 has a heat exchange core, and the first heat exchange section 10 has two flow paths through which fluids flow and exchange heat, and the two fluid flow paths are separated from each other. The first heat exchange section 10 includes interlayer flow paths separated by stacking of plates, and at least two types of fluids can flow in the first heat exchange section 10, and these two types of fluids can be heat exchanged in the first heat exchange section. For example, one type of fluid may be a refrigerant and the other type may be a cooling liquid, and may be used to cool a heat-generating element such as a battery, and may further be for three types of fluids, for example, one type of fluid may be a refrigerant and the other two types may be cooling liquids, and the two types of cooling liquids may be selected to exchange heat with the refrigerant by control, and the cooling liquid may be used to cool a member that needs to be cooled after its temperature is lowered by heat exchange. Below, two types of fluids will be described as an example.

[0011] The heat exchange unit has a first connection port 51 , a second connection port 52 , a third connection port 53 , a fourth connection port 54 , a fifth connection port 55 , a sixth connection port 56 and a seventh connection port 57 . In this embodiment, the first heat exchange section is provided with a first connection port 51 and a second connection port 52, the bridge 20 is provided with a third connection port 53, and the connection member 40 is provided with a fourth connection port 54, a fifth connection port 55, a sixth connection port 56 and a seventh connection port 57. The throttling element 110 is fixedly installed or positionally restricted in the first heat exchange section 10, the first heat exchange section 10 having four holes, e.g., a first hole 103 and a second hole 104 (not all are shown), and the first heat exchange section further has a tube having a communication port 105 in the hole 104, which communicates with the throttling element 110. The first heat exchange section 10 includes a first connection port section 101 and a second connection port section 102, the first connection port section 101 having a first connection port 51 for communicating with a coolant, and the second connection port section 102 having a second connection port 52 for communicating with a coolant, the first connection port 51 and the second connection port 52 communicating with each other via a flow path of the heat exchange core, the first connection port section 101 and the second connection port section 102 may be part of the edge plate of the first heat exchange section, or may be processed separately and fixed to the edge plate and / or heat exchange core of the first heat exchange section by welding, and the first connection port section and the second connection port section may further be fixed to the first heat exchange section in the form of a pipe connecting member.

[0012] In addition, the bridge 20 has a first engagement portion 200 and a second engagement portion 200', the first heat exchange portion 10 has an engagement portion 100 that engages with the first engagement portion 200 of the bridge, and the second heat exchange portion 30 has an engagement portion 300 that engages with the second engagement portion 200' of the bridge, and the engagement portion 100 of the first heat exchange portion 10, the engagement portion 300 of the second heat exchange portion 30, and the two engagement portions of the bridge all include planar portions. The openings of the communication holes or grooves or conductive parts provided on the first engagement part 200 side of this bridge are all located inside the first engagement part and each of the communication openings is surrounded by the first engagement part, and the first heat exchange part has a communication opening at a position corresponding to the position of each of the communication openings of the bridge, and each of the communication openings of the first heat exchange part is located inside the engagement part and each of the communication openings is surrounded by the engagement part. In this way, after the engaging portion 100 of the first heat exchange portion 10 and the first engaging portion 200 of the bridge are welded and sealed, the communicating port of the bridge can communicate with the communicating port corresponding to the first heat exchange portion, or the periphery of each communicating port includes a portion of the engaging portion, and both form a roughly closed structure with the engaging portion provided opposite, and the engaging portion 300 of the second heat exchange portion 30 and the second engaging portion 200' of the bridge are positioned correspondingly, and after the two are welded and sealed, both of the communicating ports on that side of the bridge communicate with the communicating port of the second heat exchange portion. Specifically, the second heat exchange section 30 has three hole passage mouths on the side facing the bridge 20, namely, the mouths of the third hole passage 301, the fourth hole passage 302, and the first hole passage 303. The bridge 20 has the mouth of the fluid guide hole 202, the mouth of the first groove 203, and the mouth of the hole 2041 of the fluid guide section 204 on the side facing the second heat exchange section 30, namely, the second engagement section. The mouth of the third hole passage 301 of the heat exchange section corresponds to the mouth of the fluid guide hole 202, the mouth of the fourth hole passage 302 corresponds to the mouth of the first groove 203, the mouth of the first hole passage 303 corresponds to the mouth of the hole 2041 of the fluid guide section 204, the mouth of the hole 2041 extends generally vertically, and the mouth of the first groove 203 extends generally vertically.

[0013] Orientation terms such as up and down in this text should not be considered limiting and correspond to an elevational direction. In this context, holes include, but are not limited to, through holes and blind vias, holes may be circular or non-circular in shape, and grooves generally refer to non-through situations, and grooves also include situations where the majority of the grooves are non-through but have localized through holes.

[0014] The bridge 20 further includes a third connection port portion 211, in which a third connection port 53 is located. The third connection port portion 211 includes a structure that protrudes outward. The third connection port portion 211 may be a structure that is integrated with the main body of the bridge, or a structure that is processed separately and fixed to the main body of the bridge by welding. In addition, the bridge 20 is provided with a through hole 206, the first groove 203 has a structure extending vertically similar to a blind via, and the through hole 206 is provided on a side relatively close to the third connection port portion of the first groove 203, and the bridge is provided with a second groove 205 on the side where the first engagement portion is located, and the second groove 205 has a structure extending vertically similar to a blind via, and the through hole 206 is located on a side relatively far from the third connection port portion of the second groove 205, and as shown in Figure 7, the first groove 203 and the second groove 205 are connected via the through hole 206, or the extending end of the first groove 203 is the through hole 206 or a portion of the through hole 206, and the extending end of the second groove 205 is the through hole 206 or a portion of the through hole 206. The fluid guide hole 202 is similar to a blind via, and the mouth of the fluid guide hole 202 is on the second engagement portion side, the fluid guide hole 202 is connected to the third connection port 53, and the depth of the fluid guide hole is more than half the thickness of the bridge, or close to half the thickness of the bridge, for example, more than one-third the thickness of the bridge and less than two-thirds the thickness of the bridge, the fluid guide portion 204 includes a hole 2041 and a groove 2042, the hole 2041 is similar to a through hole, the groove 2042 is similar to a blind via, and the mouth of the groove 2042 is provided on the side where the first engagement portion is located. In this specification, the side of the bridge facing the first heat exchange part is defined as the front side, and the side of the bridge facing the second heat exchange part is defined as the back side. In this example, the side of the bridge where the first groove 203 is provided is the back side, and the side where the second groove 205 is provided is the front side. The side of the bridge where the first groove 203 is provided is defined as the back side, and the side where the second groove 205 is provided is defined as the front side. At least a portion of the projection of the first groove 203 onto the front side is located on the groove 2042 of the conductive part, and at least a portion of the projection of the fluid guide hole 202 onto the front side is located on the second groove 205. That is, the fluid guide hole 202 and the second groove 205 are at least partially back-to-back and do not directly communicate with each other, and the first groove 203 and the groove 2042 are at least partially back-to-back and do not directly communicate with each other.

[0015] The connection member 40 includes a main body portion 4010 and an extension portion 4011, and further includes a fourth connection port 54, a fifth connection port 55, a sixth connection port 56 and a seventh connection port 57, as well as a fixing hole 409 for engaging and fixing or limiting the position. Furthermore, the connection member 40 has a groove 405 on the side facing the second heat exchange section 30, and the groove 405 has a structure similar to a blind via, and a seventh connection port 57 is provided at a location relatively close to the fourth connection port 54 of the groove 405, and a fifth connection port 55 is provided at approximately the center position of the groove 405, the fifth connection port 55 is connected to the groove 405, and the seventh connection port 57 is connected to the groove 405. The connection member may further include a fixing member 450 for fixing or limiting a position, and the fixing member 450 can be provided in the fixing hole 409 to be fixed or to limit a position.

[0016] The heat exchange unit can facilitate the mounting and connection of the thermal management system, reduce the number of connecting pipes, and reduce the volume of the system. This heat exchange unit is described as being applied to a vehicle thermal management system as an example, and in actual use, these parts are fixed and the flow pattern of the refrigerant is shown in this exploded view, which is only for the purpose of clearly marking the description. Specifically, the vehicle thermal management system includes a coolant system and a battery thermal management system. Referring to FIG. 5 and other figures, the battery thermal management system includes a flow path portion communicating with the first connection port portion 101 and the second connection port portion 102 of the heat exchange unit and the first connection port and the second connection port of the first heat exchange portion, and the heat of the battery can be transferred to the coolant, which flows through the flow path of that portion of the first heat exchange portion via the first connection port 51 or the second connection port 52 and exchanges heat with a refrigerant in another flow path in the first heat exchange portion, and the coolant returns further after its temperature has been lowered to cool the battery. The third connection port 53, the fourth connection port 54, the fifth connection port 55, the sixth connection port 56, and the seventh connection port 57 are respectively used to communicate with the refrigerant system, for example, the refrigerant cooled by the condenser enters the heat exchange unit via the third connection port 53, or the refrigerant via the reservoir enters the heat exchange unit via the third connection port 53. In this way, the high temperature and high pressure refrigerant reaches the third hole passage 301 of the second heat exchange section through the fluid guide hole 202, and after exchanging heat with refrigerant in another flow path in the second heat exchange section 30, reaches the fourth hole passage 302, and the refrigerant that reaches the fourth hole passage 302 is divided into two parts. That is, a portion of the refrigerant flows out through the fifth connection port 55 and the seventh connection port 57 through a flow path formed by the space in which the groove 405 is located, which is formed by the engagement of the connecting member 40 and the second heat exchange section, and is connected, for example, to a pre-evaporator through the fifth connection port 55 and to a post-evaporator through the seventh connection port 57, or is connected to a post-evaporator through the fifth connection port 55 and to a pre-evaporator through the seventh connection port 57, and a throttling element may further be provided before the pre-evaporator or the post-evaporator. In addition, the other part of the refrigerant enters the throttling element 110 through the flow path formed by the space in which the first groove 203 is located when the bridge and the engaging part of the second heat exchanger are engaged, the through hole 206, the flow path formed by the space in which the second groove 205 is located when the bridge and the engaging part of the first heat exchanger are engaged, and the communication port communicating with the throttling element, and enters the hole of the first heat exchanger 10 after being throttled by the throttling element 110, exchanges heat with the coolant in the coolant flow path in the refrigerant flow path of the first heat exchanger, reaches the first hole 103, and reaches the first hole 303 of the second heat exchanger through the flow path formed by the fluid guide part 204 when the bridge, the first heat exchanger, and the second heat exchanger are engaged, and flows out through the fourth connection port communicating with the first hole 303, for example, and returns to the compressor. In addition, the sixth connection port 56 may be used to communicate the refrigerant returned from the pre-evaporator and / or the post-evaporator. The low-temperature refrigerant in this portion flows through the second hole passage 304 of the second heat exchange section to the first hole passage 303, and exchanges heat with the high-temperature refrigerant flowing from the third hole passage 301 to the fourth hole passage 302. After the refrigerant from both portions merge in the first hole passage 303, it can be returned to the compressor through the fourth connection port. In this way, some of the low temperature refrigerant is used to cool the high temperature refrigerant, lowering the condensation temperature of the refrigerant and preventing the temperature of the refrigerant returned to the compressor from becoming too high. The flow directions in this specification are for illustration only and are not limiting or closed requirements, and other components can be added therein, such as adding other control valve components before the compressor, etc. The bridge 20 is further provided with a second mounting portion 207 for mounting a sensing element 250, for example a temperature sensing element, and a temperature sensing head 2501 is passed through the mounting portion and positioned in the flow path where the fluid guide portion 204 is located, so that the temperature of the refrigerant after passing through the first heat exchange portion or the outlet temperature of the evaporator can be obtained.

[0017] This heat exchange unit can realize heat exchange between a high-temperature refrigerant and a part of a low-temperature refrigerant, lower the temperature of the high-temperature refrigerant, and prevent the temperature of the refrigerant returning to the compressor from being too high, thereby improving efficiency; in addition, it can reduce the installation of piping between the connection ports, and the system connection is simple and convenient. In order to further reduce the weight, the bridge can also be as shown in Fig. 10 and Fig. 11, which is an improvement to the above embodiment, in the middle of the bridge, one piece is removed to form a hole 2032, the shape of the hole 2032 can be non-standard shape and can be removed according to the requirement of engagement welding, the hole is a through hole, the distance from the through hole 2032 to the second groove 205 for communication facing the first heat exchange part of the bridge is not less than 1.5mm, and the distance from the through hole 2032 to the second groove 205 for communication facing the first heat exchange part of the bridge is not less than 1.5mm. the distance from the through hole 2032 to the first communicating groove 203 facing the second heat exchange part of the bridge is 1.5 mm or more, the distance from the through hole 2032 to the communicating hole 202' facing the second heat exchange part of the bridge is 1.5 mm or more, the hole 202' is a fluid guide hole, the distance from the through hole 2032 to the first communicating groove 203 facing the second heat exchange part of the bridge is 1.5 mm or more, the distance from the through hole 2032 to the communicating hole 2041 facing the second heat exchange part of the bridge is 1.5 mm or more, or this distance is the distance of the engagement parts for engaging and welding the bridge to the first heat exchange part and the second heat exchange part, respectively. However, the lightening holes are not necessarily through holes; for example, having both sides of the bridge recessed inward and having blind vias or grooves formed on both sides can both reduce weight and contribute to welding, but through holes are more suitable for machining. Also, by removing one piece on one side to form a recess, i.e., notch 2031, the area of ​​the first engagement portion for engaging with the first heat exchange portion of the bridge can be reduced, and similarly, the area of ​​the second engagement portion for engaging with the second heat exchange portion can be reduced, thus reducing the area of ​​the engagement weld, which contributes to improving the welding quality while also reducing the weight. At the junction of the hole 2041 and the groove 2042, the bridge has a first wall portion 215 and a second wall portion 216, and the surface of the first wall portion 215 facing the fluid guide portion forms a first wall surface 2045 which smoothly transitions, and the surface of the second wall portion 216 facing the fluid guide portion forms a second wall surface 2046 which smoothly transitions.In this way, the bridge, the first heat exchange portion, and the second heat exchange portion engage with each other, and through the flow path formed by the fluid guide portion 204', the flow resistance of the refrigerant can be reduced in the case of swirling due to the provision of a smooth transition portion. The non-circular fluid guide holes 202' are generally laterally extending, and thus are more convenient for engagement and communication.

[0018] Below, we will introduce the heat exchange unit of the second embodiment. Please refer to Figures 12 to 17. Figures 12 and 13 are oblique views of the heat exchange unit, Figure 14 is an exploded view of the heat exchange unit, Figure 15 is an oblique view of the bridge in the heat exchange unit from two directions, Figure 16 is a front view of the bridge in Figure 15, and Figure 17 is an exploded view of the connecting members in the heat exchange unit of Figure 12. The heat exchange unit includes a first heat exchange section 10, a bridge 20, a second heat exchange section 30, and a connecting member. The heat exchange unit has a first connection port 51 , a second connection port 52 , a third connection port 53 , a fourth connection port 54 , a fifth connection port 55 , a sixth connection port 56 , a seventh connection port 57 and an eighth connection port 58 . The bridge 20 is provided with a third connection port portion 211 . The throttling element 110 is fixedly installed or positionally restricted in the first heat exchange section 10, and the first heat exchange section 10 has four holes, e.g., a first hole 103 and a second hole 104 (not all are shown), and the first heat exchange section 10 includes a first connection port section 101 and a second connection port section 102. The first connection port portion 101 has a first connection port 51 for communicating with the coolant, and the second connection port portion 102 has a second connection port 52 for communicating with the coolant, the first connection port 51 and the second connection port 52 are connected by a flow path of the heat exchange core, and the first connection port portion 101 and the second connection port portion 102 may be part of the edge plate of the first heat exchange portion, or may be machined separately and fixed to the edge plate and / or heat exchange core of the first heat exchange portion by welding.

[0019] The bridge 20 has a first engagement portion 200, the first heat exchange portion 10 has an engagement portion 100 that engages with the first engagement portion 200 of the bridge, the first engagement portion 200 engages relative to the engagement portion of the first heat exchange portion, and the engagement portion 100 of the first heat exchange portion 10 and the first engagement portion 200 of the bridge both include planar portions. The openings of the communication holes or grooves or conductive parts provided on the first engagement part 200 side of the bridge are located inside the first engagement part and each communication opening is surrounded by the first engagement part, and the first heat exchange part has a corresponding communication opening at a position corresponding to the position of each communication opening of the bridge, and each communication opening is located inside the engagement part and each communication opening is surrounded by the engagement part, or both of them include a structure that is roughly closed together with the engagement parts provided opposite to each other. In this manner, after the engaging portion 100 of the first heat exchange portion 10 and the first engaging portion 200 of the bridge are welded and sealed together, the communication opening of the bridge is connected to the communication opening corresponding to the first heat exchange portion. Specifically, the first heat exchange section 10 has, on the side facing the bridge 20, an opening 105 of the piping that communicates with the mouth of the first hole passage 103 and the throttling element, and the first heat exchange section 10 has, on the side facing the bridge 20, an opening 105 of the first hole passage 103 and the throttling element, and the bridge 20 has corresponding holes 223 and 224 on the side facing the first heat exchange section 10, the opening 223 and the opening 103 of the first hole passage 103 of the first heat exchange section are positioned in correspondence with each other, the opening 105 of the hole 224 corresponds to the opening 105 for communication that communicates with the throttling element, and the holes 223 and 224 are through holes.

[0020] The bridge 20 has a second engagement portion 200' facing the second heat exchange portion, and the second heat exchange portion 30 has an engagement portion 300, and the engagement portion 300 of the second heat exchange portion 30 and the second engagement portion 200' of the bridge both include planar portions. The bridge has a communication hole, groove or conductive portion formed on the second engagement portion, and the mouth of the communication hole, groove or conductive portion is located inside the second engagement portion, and each communication mouth is surrounded by the second engagement portion. The second heat exchange section also has a corresponding communication port at a position corresponding to the position of each communication port of the bridge, and each communication port is located inside its engagement portion and the periphery of each communication port is surrounded by said engagement portion, or the periphery of each communication port includes a portion of said engagement portion. The two parts form a generally closed structure together with their opposing engaging portions, and the engaging portion 300 of the second heat exchange portion 30 and the second engaging portion 200' of the bridge are positioned in correspondence with each other, and after the two are welded and sealed, the communication port on that side of the bridge can be connected to the communication port of the second heat exchange portion. Specifically, the second heat exchange section 30 has the mouths of three holes on the side facing the bridge 20, namely, the mouths of the third hole 301, the fourth hole 302 and the first hole 303, and the bridge 20 has the mouth of the fluid guide hole 202, the mouth of the hole 223 and the mouth of the hole 224 on the side facing the second heat exchange section 30, i.e., the second engagement section, and the mouth of the third hole 301 of the second heat exchange section corresponds in position to the mouth of the fluid guide hole 202, the mouth of the fourth hole 302 corresponds in position to the mouth of the hole 224, and the mouth of the first hole 303 corresponds in position to the mouth of the hole 223. The bridge 20 further includes a third connection port portion 211 . The third connection port portion 211 has a third connection port 53, and the third connection port portion 211 includes a structure that protrudes outward. The third connection port portion 211 may be a structure that is integrated with the main body of the bridge, or may be a structure that is processed separately and fixed to the main body of the bridge by welding. The bridge 20 is provided with four holes 2032, which are non-circular through holes and may be circular. The fluid guide hole 202 is similar to a blind via, and the mouth of the fluid guide hole 202 is provided on the side where the second engagement portion is located, and the fluid guide hole 202 communicates with the third connection port 53. The bridge further includes a protrusion 217 and a second protrusion 218, the protrusion 217 being arranged to protrude generally laterally along the main body portion, the second protrusion 218 being arranged to protrude generally outward from one corner of the main body portion, a first side 2171 of the protrusion 217 being lower than the second engagement portion 200' of the bridge, and a second side 2172 of the protrusion 217 being lower than the first engagement portion 200 of the bridge, and similarly, both side surfaces of the second protrusion are correspondingly lower than the engagement portions on the corresponding sides of the bridge, or the thickness of the protrusion 217 is less than the thickness of the main body portion of the bridge, and the thickness of the second protrusion 218 is less than the thickness of the main body portion of the bridge. Providing the protrusion and the second protrusion can reduce the main body of the bridge, and at least a portion of the fixing hole 221 can be provided in the protrusion 217 and / or the second protrusion 218, and at least a portion of the third connection port portion 211 can be located in the second protrusion, thereby reducing the main body.

[0021] The connection member includes a connection block 411 , a connection plate 412 , a first connector engagement portion 4131 , a second connector engagement portion 4132 , and a third connector engagement portion 4133 . The connection block 411, the connection plate 412, the first connector engagement portion 4131, the second connector engagement portion 4132, and the third connector engagement portion 4133 can be fixed by welding, and the thickness of the connection block 411 is greater than the thickness of the connection plate 412. The first connector engagement portion 4131 is provided with a fourth connection port 54, the second connector engagement portion 4132 is provided with a seventh connection port 57 and an eighth connection port 58, and the third connector engagement portion 4133 is provided with a fifth connection port 55 and a sixth connection port 56. The three fitting engagement portions of the connecting member are further provided with fixing holes 409 for engaging with a fixing member 450 to be fixed or restricted in position. The connection plate 412 is located between the connection block 411 and the three pipe connection engagement portions, and the connection block is relatively close to the second heat exchange portion, or the connection block is fixed by welding close to the second heat exchange portion. The connecting block 411 has three through holes, namely, through hole 4111, through hole 4112, and through hole 4113, and the through holes 4111 and 4112 may be non-circular and may be arranged at an angle or in an arc, and the shape is not required as long as the positions of both ends can conduct corresponding flow paths, and the through hole 4113 is circular, and on one side of the through holes 4111 and 4112, the through hole 4113 is located relatively close to the longitudinal side of the connecting block. The connecting plate has five through holes, namely, 4121, 4122, 4123, 4124, 4125; the positions of the through holes 4121 and 4125 correspond to the through hole 4111, i.e., the through holes 4121 and 4125 can both communicate with the through hole 4111; the positions of the through holes 4122 and 4124 correspond to the through hole 4112, respectively, i.e., the through holes 4122 and 4124 can both communicate with the through hole 4112; the position of the through hole 4123 corresponds to the through hole 4113; the position of the fourth connection port 54 corresponds to the through hole 4121, which can communicate with the through hole 4121, i.e., can communicate with the through hole 4111 of the connecting block; The position of the 8th connection port 58 corresponds to the through hole 4125, and the 8th connection port is connected to the through hole 4125, i.e., can be connected to the through hole 4111 of the connection block, the position of the 7th connection port 57 corresponds to the through hole 4124, and the 7th connection port is connected to the through hole 4124, i.e., can be connected to the through hole 4112 of the connection block, the position of the 5th connection port 55 corresponds to the through hole 4122, and the 5th connection port is connected to the through hole 4122, i.e., can be connected to the through hole 4112 of the connection block, and the position of the 6th connection port 56 corresponds to the through hole 4123, and the 6th connection port is connected to the through hole 4123, i.e., can be connected to the through hole 4113 of the connection block. In this embodiment, the connecting member may be formed by combining a molded or pressed member, thereby reducing the machining steps.

[0022] The heat exchange unit facilitates the mounting and connection of the thermal management system, reduces the number of connecting pipes and connecting ports, and accordingly reduces the volume of the thermal management system. This heat exchange unit will be described as being applied to a vehicle thermal management system as an example. In actual use, these components are fixed, and the flow method of the refrigerant is shown in this exploded view, with reference to Figure 14 and other figures. The vehicle thermal management system includes a coolant system and a battery thermal management system. The battery thermal management system includes a flow path portion communicating with the first connection port portion 101 and the second connection port portion 102 of the heat exchange unit, and the first connection port and the second connection port of the first heat exchange portion, so that the heat of the battery can be transferred to the coolant, which flows through the flow path of that portion of the first heat exchange portion via the first connection port 51 or the second connection port 52 and exchanges heat with a refrigerant in another flow path in the first heat exchange portion.The coolant returns further after its temperature has been lowered, thereby cooling the battery. The third connection port 53, the fourth connection port 54, the fifth connection port 55, the sixth connection port 56, the seventh connection port 57, and the eighth connection port 58 are each used for communicating with the refrigerant system. For example, the refrigerant cooled by the condenser enters the heat exchange unit through the third connection port 53, or the refrigerant via the reservoir enters the heat exchange unit through the third connection port 53. In this way, the high-temperature, high-pressure refrigerant reaches the third hole passage 301 of the second heat exchange section through the fluid guide hole 202, and after exchanging heat with refrigerant in another flow path in the second heat exchange section 30, reaches the fourth hole passage 302, and the refrigerant that reaches the fourth hole passage 302 is divided into both parts. That is, a portion of the flow path formed by the connecting member and the second heat exchange section, for example, reaches the seventh connection port 57 through the through hole 4112 of the connection block 411 and the through hole 4124 of the connecting plate, reaches the fifth connection port 55 through the through hole 4112 of the connection block 411 of the connecting member and the through hole 4122 of the connecting plate, and flows out through the fifth connection port 55 and the seventh connection port 57, and, for example, leads to a pre-evaporator through the fifth connection port 55 and to a post-evaporator through the seventh connection port 57, or leads to a post-evaporator through the fifth connection port 55 and to a pre-evaporator through the seventh connection port 57, and a throttling element may further be provided before the pre-evaporator or the post-evaporator. In addition, the other part of the refrigerant enters the throttling element 110 through the bridge's through hole 224 and the piping connection port 105 connected to the throttling element 110, there is no communication between the bridge and the second hole 104, and after being throttled by the throttling element 110, it enters the second hole 104 of the first heat exchange section 10, exchanges heat with the coolant in the coolant flow path in the refrigerant flow path of the first heat exchange section, reaches the first hole 103, reaches the first hole 303 of the second heat exchange section through the bridge's through hole 223, flows out through the connection block's through hole 411 connected to the first hole 303, the connection plate's through hole 4121 and the fourth connection port 54, and returns to, for example, the compressor, and the sixth connection port 56 may also be used to communicate the refrigerant flowed back from the pre-evaporator and / or post-evaporator. This portion of the low-temperature refrigerant reaches the second hole passage 304 of the second heat exchange section via the through hole 4123 of the connecting plate and the through hole 4113 of the connecting block, and further flows to the first hole passage 303 and exchanges heat with the high-temperature refrigerant flowing from the third hole passage 301 to the fourth hole passage 302. In the first hole passage 303, the refrigerant of both portions can be merged and then returned to the compressor via the fourth connection port. The eighth connection port 58 may be used to communicate the refrigerant returned from the rear evaporator and / or the front evaporator. This portion of the low-temperature refrigerant can be merged with the remaining refrigerant via the through hole 4125 of the connecting plate and the through hole 4111 of the connecting block, and returned to the compressor via the fourth connection port. The flow directions in this specification are for illustrative purposes only and are not limiting or closed requirements, and other components can be added therein, such as adding other control valve components before the compressor, etc. The bridge 20 is provided with a second mounting portion 207 for mounting a sensing element 250, for example a temperature sensor element, and the hole of the second mounting portion 207 can communicate with the through hole 223, so that the temperature sensing head 2501 passes through the mounting portion and is positioned in the flow path where the through hole 223 is located, and in this way, the temperature of the refrigerant after passing through the first heat exchange portion or the outlet temperature of the evaporator can be obtained.

[0023] Below, we will introduce the heat exchange unit of the third embodiment, and refer to Figures 18 to 24. Figures 18 and 19 are oblique views of the heat exchange unit, Figure 20 is a diagram of the bridge of the embodiment, Figure 21 is an exploded view of the heat exchange unit, Figure 22 is an oblique view of the connecting member in the heat exchange unit, and Figures 23 and 24 are forward and reverse views of the connecting block in the connecting member in Figure 22.

[0024] This heat exchange unit includes a first heat exchange section 10, a bridge 20, a second heat exchange section 30, and a connecting member. The heat exchange unit has a first connection port 51 , a second connection port 52 , a third connection port 53 , a fourth connection port 54 , a fifth connection port 55 , a sixth connection port 56 , a seventh connection port 57 and an eighth connection port 58 . The throttling element 110 is fixedly installed or positionally restricted in the first heat exchange section 10, and the first heat exchange section 10 has four holes, for example, a first hole 103 and a second hole 104 (the remaining two are not shown in the figure), and the first heat exchange section 10 includes a first connection port section 101 and a second connection port section 102. The first connection port portion 101 has a first connection port 51 for communicating with the coolant, and the second connection port portion 102 has a second connection port 52 for communicating with the coolant, the first connection port 51 and the second connection port 52 are connected via a flow path of the heat exchange core, and the first connection port portion 101 and the second connection port portion 102 may be part of the edge plate of the first heat exchange portion, or may be machined separately and fixed to the edge plate and / or heat exchange core of the first heat exchange portion by welding.

[0025] The bridge 20 has a first engagement portion 200 and a second engagement portion 200', and correspondingly, the first engagement portion 200 engages with the engagement portion 100 of the first heat exchange portion 10, and the second engagement portion 200' engages with the engagement portion 300 of the second heat exchange portion 30, the engagement portion 100 of the first heat exchange portion 10, the engagement portion 300 of the second heat exchange portion 30 and the two engagement portions of the bridge all include planar portions, the bridge 20 includes a through hole 223 and a through hole 222 extending generally laterally, and the bridge 20 further includes a second mounting portion 207. The hole of the second mounting portion 207 communicates with the through hole 222 , or the mounting portion is provided on the side close to the through hole 222 . The mouths of the through holes 223 and 222 on the side closest to the first heat exchange section are located inside the first engagement section and are surrounded by the first engagement section, or the periphery of the mouths of the through holes 223 and 222 have a flat portion for engaging and welding to seal, and on the other side, the mouths of the through holes 223 and 222 are located inside the second engagement section and are surrounded by the second engagement section, or the periphery of the mouths of the through holes 223 and 222 have a flat portion for engaging and welding to seal.In this way, after the engagement section 100 of the first heat exchange section 10 and the first engagement section 200 of the bridge are both welded and sealed, the mouths of the two through holes of the bridge are connected to the communicating mouths corresponding to the first heat exchange section. Specifically, the through hole 223 of the bridge communicates with the communication port 105, the communication port 105 communicates with the throttling element, the through hole 222 communicates with the first hole passage 103 of the first heat exchange section 10, the openings of the two through holes of the bridge communicate with the communication openings corresponding to the second heat exchange section, the through hole 223 of the bridge communicates with the fourth hole passage 302 of the second heat exchange section, and the through hole 222 communicates with the first hole passage 303 of the second heat exchange section 30.

[0026] The bridge 20 further includes two through holes 2032, where the provision of the through holes 2032 can reduce the weight of the bridge, reduce the area of ​​the flat surfaces of the two engaging parts of the bridge, and reduce the engaging parts of the first heat exchange part and the second heat exchange part of the bridge, thus relatively controlling the contact and welding range and correspondingly improving the welding quality. The manufacture of this bridge is relatively simple, for example, a mold can be adopted, four corresponding through holes can be formed on the mold, and it is manufactured by material injection, processing mounting parts, and two engaging parts on both sides, etc., and the processing steps can be relatively reduced.

[0027] The connection member includes a connection block 421 and a connection port engaging member 423, and the connection block 421 and the connection port engaging member 423 may be fixed by welding or may be sealed and connected by a fixing member and a sealing member. The connection member is provided with a third connection port 53, a fourth connection port 54, a fifth connection port 55, a sixth connection port 56, a seventh connection port 57 and an eighth connection port 58. The connection block includes a third connection port portion 4213 , a fourth connection port portion 4214 , a fifth connection port portion 4215 and a sixth connection port portion 4216 . The third connection port portion 4213, the fourth connection port portion 4214, the fifth connection port portion 4215, and the sixth connection port portion 4216 may be integrated with the plate portion of the connection block, or may be machined separately and fixed to the plate portion of the connection block by welding. The connection block is further provided with through holes 4217 and 4218, and is further provided with a fixing hole 429 for engaging and fixing or limiting the position, the connection member has grooves 4211 and 4212 on the side facing the second heat exchange section 30, the grooves having a structure similar to a blind via, the connection block is provided with a fourth connection port 54 and a through hole 4218 on either side of the groove 4211, the fourth connection port 54 and the through hole 4218 communicating with the groove 4211, and the connection block is provided with a fifth connection port 55 and a through hole 4217 in the groove 4212, the fifth connection port 55 and the through hole 4217 communicating with the groove 4212. The sixth connection port 56 is connected to the second hole passage 304 of the second heat exchange section 30, the fifth connection port 55 is connected to the fourth hole passage 302 of the second heat exchange section 30, the third connection port 53 is connected to the third hole passage 301 of the second heat exchange section 30, and the fourth connection port 54 is connected to the first hole passage 303 of the second heat exchange section 30. The connection port engaging member 423 is provided with a seventh connection port 57 which corresponds to and communicates with the through hole 4217 of the connection block, and an eighth connection port 58 which corresponds to and communicates with the through hole 4218 of the connection block.

[0028] In order to mark the flow pattern of the refrigerant when in use, the exploded view of FIG. 21 is shown, and when actually used, some parts are fixedly installed. Specifically, the vehicle thermal management system includes a coolant system and a battery thermal management system. 21 and other figures, the battery thermal management system includes a flow path portion communicating with the first connection port portion 101 and the second connection port portion 102 of the heat exchange unit and the first connection port and the second connection port of the first heat exchange portion, and the heat of the battery can be transferred to the coolant, which flows through the flow path of that portion of the first heat exchange portion via the first connection port 51 or the second connection port 52 and exchanges heat with a refrigerant in another flow path in the first heat exchange portion, and the coolant returns after its temperature has been lowered to cool the battery. The third connection port 53, the fourth connection port 54, the fifth connection port 55, the sixth connection port 56, the seventh connection port 57, and the eighth connection port 58 are respectively used to communicate with the refrigerant system, for example, the refrigerant cooled by the condenser enters the heat exchange unit via the third connection port 53, or the refrigerant through the reservoir enters the heat exchange unit via the third connection port 53. In this way, the high temperature and high pressure refrigerant connection member reaches the third hole passage 301 of the second heat exchange section 30, exchanges heat with refrigerant in another flow path in the second heat exchange section 30, and then reaches the fourth hole passage 302, and the refrigerant that reaches the fourth hole passage 302 is divided into both parts. That is, a portion of the refrigerant flows out through the fifth connection port 55 and the seventh connection port 57 through a flow path formed by the space in which the groove 4212 is located, which is formed by the engagement of the connecting member and the second heat exchange section, and, for example, flows to the pre-evaporator through the fifth connection port 55 and to the post-evaporator through the seventh connection port 57, or flows to the post-evaporator through the fifth connection port 55 and to the pre-evaporator through the seventh connection port 57, and a throttling element may further be provided before the pre-evaporator or the post-evaporator. The other part of the refrigerant enters the throttling element 110 through the bridge hole 223 connected to the fourth hole passage 302 of the second heat exchanger and the communication port 105 connected to the throttling element, and after being throttled by the throttling element 110, enters the second hole passage 104 of the first heat exchanger 10, exchanges heat with the coolant in the coolant flow passage in the refrigerant flow passage of the first heat exchanger, reaches the first hole passage 103, and reaches the first hole passage 303 of the second heat exchanger through the flow passage formed by the through hole 222 when the bridge, the first heat exchanger, and the second heat exchanger engage with each other, and flows out through the fourth connection port connected to the first hole passage 303, for example, and returns to the compressor. The sixth connection port 56 may also be used to communicate the refrigerant returned from the pre-evaporator or post-evaporator. This portion of the low-temperature refrigerant flows through the second hole passage 304 of the second heat exchange section to the first hole passage 303, exchanges heat with the high-temperature refrigerant flowing from the third hole passage 301 to the fourth hole passage 302, and after merging with the remaining refrigerant in the first hole passage 303, it can be flowed back to the compressor through the fourth connection port. In addition, the eighth connection port 58 may be used to communicate the refrigerant returned from the rear evaporator or the front evaporator, and this portion of the low-temperature refrigerant flows to the fourth connection port through a flow path formed by the engagement of the connection member and the second heat exchange part and joining the groove 4211, and the three portions of the refrigerant can be merged and then returned to the compressor through the fourth connection port. The flow directions in this document are not meant to be restrictive or closed requirements, and other elements may be added thereto, for example other control valve elements before the compressor, etc. The bridge 20 is further provided with a second mounting portion 207 for mounting a sensing element 250, for example a temperature sensing element, and a temperature sensing head 2501 is passed through the mounting portion and positioned in the flow path where the through hole 222 is located, so that the temperature of the refrigerant after passing through the first heat exchange portion or the outlet temperature of the evaporator can be obtained.

[0029] Several refrigerant connection ports are provided on the connection member, thus making the connection more convenient in the case of application, and the pipes are also concentrated on the same side.

[0030] The heat exchange unit of the fourth embodiment is shown in Figures 25 to 28, where Figure 25 is an oblique view of the heat exchange unit of the fourth embodiment, Figure 26 is an exploded view of the heat exchange unit, Figure 27 is an oblique view of the bridge in the heat exchange unit, and Figure 28 is a front view of the bridge in Figure 27 and cross-sectional views in the E-E and D-D directions.

[0031] The heat exchange unit includes a first heat exchange section 10, a throttle element 110, a bridge 20, a second heat exchange section 30, and a connecting member. The bridge 20 is mostly located between the first heat exchange section 10 and the second heat exchange section 30, and the connecting member 40 is located on the other side of the second heat exchange section 30, i.e., the bridge 20 and the connecting member 40 are respectively provided on both sides of the second heat exchange section, and the first heat exchange section 10, the bridge 20 and the second heat exchange section 30 are fixed by welding, or the first heat exchange section 10, the bridge 20, the second heat exchange section 30 and the connecting member are fixed by welding. The first heat exchange section 10 is larger than the second heat exchange section 30 .

[0032] The first heat exchange section 10 has a heat exchange core, and has two flow paths through which fluids flow and exchange heat, with the two fluid flow paths being spaced apart, and the first heat exchange section 10 includes interlayer flow paths separated by stacking of plates. At least two types of fluids can flow through the first heat exchange section 10, and these two types of fluids can exchange heat in the first heat exchange section; for example, one type of fluid can be a refrigerant and the other type can be a cooling liquid, and can be used, for example, to cool a heat-generating element such as a battery, and it can also be for three types of fluids, for example, one type of fluid can be a refrigerant and the other two types can be cooling liquids, and the two types of cooling liquid can be selected to exchange heat with the refrigerant by control, and the cooling liquid can be used to cool a component that needs cooling after its temperature is lowered by heat exchange, and two types of fluid will be explained below as an example.

[0033] The heat exchange unit of the fourth embodiment has a first connection port 51, a second connection port 52, a third connection port 53, a fourth connection port , a fifth connection port 55 and a sixth connection port . The first heat exchange section is provided with a first connection port section 101 and a second connection port section 102, the bridge 20 is provided with a third connection port section 211, and the connection member 40 is provided with a fourth connection port 54, a fifth connection port 55 and a sixth connection port 56. The diaphragm element 110 is fixedly mounted or limited in position on the bridge 20 . The first heat exchange section 10 has four holes, for example a first hole 103 and a second hole 104 (the other two are not shown). The first heat exchange section 10 includes a first connection port section 101 and a second connection port section 102 . The first connection port portion 101 has a first connection port 51 for communicating with the coolant, and the second connection port portion 102 has a second connection port 52 for communicating with the coolant, the first connection port 51 and the second connection port 52 are connected via a flow path of the heat exchange core, and the first connection port portion 101 and the second connection port portion 102 may be part of the edge plate of the first heat exchange portion, or may be machined separately and fixed to the edge plate and / or heat exchange core of the first heat exchange portion by welding.

[0034] The bridge 20 has a first engagement portion 200 and a second engagement portion 200', and correspondingly, the first heat exchange portion 10 has an engagement portion 100 that corresponds to and engages with the first engagement portion 200 of the bridge, and the second heat exchange portion 30 has an engagement portion 300 that corresponds to and engages with the second engagement portion 200' of the bridge, and the engagement portion 100 of the first heat exchange portion 10, the engagement portion 300 of the second heat exchange portion 30 and the two engagement portions of the bridge all include flat portions. The openings of the communication holes, grooves or conductive parts on the first engagement part 200 side of the bridge are located inside the first engagement part and each communication opening is surrounded by the first engagement part, and the first heat exchange part has a corresponding communication opening at a position corresponding to the position of each communication opening of the bridge, and each communication opening of the first heat exchange part is located inside the engagement part and each communication opening is surrounded by the engagement part. In this way, after the engaging portion 100 of the first heat exchange portion 10 and the first engaging portion 200 of the bridge are welded and sealed, the communicating port of the bridge can communicate with the communicating port corresponding to the first heat exchange portion, or the periphery of each communicating port includes a portion of the engaging portion, and both form an approximately closed structure together with the engaging portion provided opposite to each other. The first heat exchange section 10 has an opening of the first hole passage 103 and an opening of the second hole passage 104 on the side facing the bridge 20, and the bridge 20 has corresponding holes 2084 and 2091 on the side facing the first heat exchange section 10, with the opening of hole 2084 corresponding in position to the opening of the first hole passage 103 of the first heat exchange section, and the opening of hole 2091 corresponding in position to the opening of the second hole passage 104 of the first heat exchange section. In addition, the bridge 20 further has a groove 2080 on the side facing the first heat exchange section 10, one side of the groove 2080 communicating with the hole 2081 and the other side of the groove further has one oblique hole 2082 communicating with the hole in the mounting section 209 on the other side. In this way, the hole in the mounting section 209 communicates with the hole 2081 via the oblique hole 2082 and the groove 2080.

[0035] The engaging portion 300 of the second heat exchange portion 30 and the second engaging portion 200' of the bridge are positioned in correspondence with each other, and after the two are welded and sealed, the communication ports on that side of the bridge are each connected to the communication ports of the second heat exchange portion. Specifically, the second heat exchange section 30 has the mouths of three holes on the side facing the bridge 20, namely, the mouths of the third hole 301, the fourth hole 302 and the first hole 303, and the bridge 20 has the mouth of the fluid guide hole 202, the mouth of the hole 2081 and the mouth of the hole 2084 on the side facing the second heat exchange section 30, i.e., the second engagement section, and the mouth of the third hole 301 of the second heat exchange section corresponds in position to the mouth of the fluid guide hole 202, the mouth of the fourth hole 302 corresponds in position to the mouth of the hole 2081, and the mouth of the first hole 303 corresponds in position to the mouth of the hole 2084.

[0036] The bridge 20 includes a third connection port portion 211 , a second mounting portion 207 , and a mounting portion 209 . The third connection port portion 211 has a third connection port 53, and the third connection port portion 211 includes a structure that protrudes outward. The third connection port portion 211 may be a structure that is integrated with the main body of the bridge, or may be a structure that is processed separately and fixed to the main body of the bridge by welding. The second mounting portion 207 is used to engage and mount a sensing element, and the mounting portion 209 is used to engage and mount an aperture element. The hole of the second mounting part 207 is connected to the hole 2084, and the temperature sensing head 2501 of the temperature sensor is positioned in the flow path where the hole 2084 is located through the second mounting part 207, and in this way, the temperature of the refrigerant after passing through the first heat exchange part or the outlet temperature of the evaporator can be obtained. In addition, the mounting direction of the diaphragm element may be in another direction, for example, the mounting portion extends from the side of the bridge into the inside of the bridge, and the axis of the diaphragm element is approximately parallel to the longitudinal direction of the bridge.

[0037] The bridge 20 also has three through holes 2032 to reduce the weight of the bridge and reduce the area of ​​the flat surface that supports welding, thereby improving the quality of the weld. The bridge 20 is further provided with fixing holes 221 for fixing.

[0038] The connection member includes a connection 1 portion 431 and a connection 2 portion 432 . The connection 1 part 431 includes the fourth connection port 4, and the connection 2 part 432 has a fifth connection port 55 and a sixth connection port 56, and the connection 1 part 431 has a space that corresponds to and engages with the first hole 303 of the second heat exchange part 30 so as to realize a flow path from the first hole 303 to the fourth connection port. Specifically, the connection 1 part 431 may be in the form as shown in the figure, or may be fixed to a corresponding position around the first hole 303 in the form of a joint. The fifth connection port 55 of the connection 2 part 432 corresponds to and engages with the fourth hole passage 302 of the second heat exchange part 30, and the sixth connection port 56 of the connection 2 part 432 corresponds to and engages with the second hole passage 304 of the second heat exchange part 30. The connection member may further include a fixing member 450 for fixing or limiting its position, and the connection 1 part 431 and the connection 2 part 432 may have fixing holes, and the fixing member 450 may be provided in the fixing hole 409 for fixing or limiting its position.

[0039] The heat exchange unit can facilitate the mounting and connection of the thermal management system, reduce the number of connecting pipes, and reduce the volume of the system. This heat exchange unit is described as being applied to a vehicle thermal management system as an example, and in actual use, these parts are fixed and the flow pattern of the refrigerant is shown in this exploded view, which is only for the purpose of clearly marking the description. Specifically, the vehicle thermal management system includes a coolant system and a battery thermal management system. 26 and other figures, the battery thermal management system includes a flow path portion communicating with the first connection port portion 101 and the second connection port portion 102 of the heat exchange unit and the first connection port and the second connection port of the first heat exchange portion, and the heat of the battery can be transferred to the coolant, which flows through the flow path of that portion of the first heat exchange portion via the first connection port 51 or the second connection port 52 and exchanges heat with a refrigerant in another flow path in the first heat exchange portion, and the coolant returns after its temperature has been lowered to cool the battery. The third connection port 53, the fourth connection port 54, the fifth connection port 55, and the sixth connection port 56 are respectively used to communicate with the refrigerant system, for example, the refrigerant cooled by the condenser enters the heat exchange unit through the third connection port 53, or the refrigerant through the reservoir enters the heat exchange unit through the third connection port 53, thus the high temperature and high pressure refrigerant reaches the third hole passage 301 of the second heat exchange section through the fluid guide hole 202, and after heat exchange with the refrigerant of another flow path in the second heat exchange section 30, reaches the fourth hole passage 302, and the refrigerant that reaches the fourth hole passage 302 is divided into both parts. That is, a portion flows out from the fifth connection port 55 via the connection 2 part 432 and communicates, for example, with a pre-evaporator or another evaporator via the fifth connection port 55, and a throttling element may further be provided before the pre-evaporator. The other part of the refrigerant enters the throttling element 110 through the hole 2081 of the bridge, the groove 2080 and the oblique hole 2082, and after being throttled by the throttling element 110, reaches the second hole passage 104 of the first heat exchange section 10 through the hole 2091, exchanges heat with the coolant in the coolant flow passage in the refrigerant flow passage of the first heat exchange section, reaches the first hole passage 103, passes through the hole 2084 of the bridge, the first hole passage 303 of the second heat exchange section, and flows out through the fourth connection port communicating with the first hole passage 303, for example, and returns to the compressor, and the sixth connection port 56 may also be used to communicate the refrigerant flowed back from the pre-evaporator or another evaporator. This portion of the low-temperature refrigerant flows through the second hole passage 304 of the second heat exchange section to the first hole passage 303, and exchanges heat with the high-temperature refrigerant flowing from the third hole passage 301 to the fourth hole passage 302. In the first hole passage 303, the refrigerants of both portions are merged and then can be returned to the compressor through the fourth connection port. In this way, a portion of the low-temperature refrigerant is used to cool the high-temperature refrigerant, which can lower the condensation temperature of the refrigerant and prevent the temperature of the refrigerant returned to the compressor from being high. The flow directions herein are not intended to be limiting or closed requirements, and other elements may be added thereto, for example, other control valve elements before the compressor, etc.

[0040] Furthermore, the heat exchange unit of the fifth embodiment is shown in Figures 29 to 32, where Figure 29 is an oblique view of the heat exchange unit of the fifth embodiment, Figure 30 is an exploded view of the heat exchange unit, Figure 31 is a view of a bridge in the heat exchange unit, and Figure 32 is a view of the bridge in Figure 31 from another direction and cross-sectional views in the G-G and F-F directions. The heat exchange unit includes a first heat exchange section 10, a throttle element 110, a bridge 20, a second heat exchange section 30 and a connecting member. The bridge 20 is mostly located between the first heat exchange section 10 and the second heat exchange section 30, and the connecting member is located on the other side of the second heat exchange section 30, i.e., the bridge 20 and the connecting member are respectively provided on both sides of the second heat exchange section, and the first heat exchange section 10, the bridge 20 and the second heat exchange section 30 are fixed by welding, or the first heat exchange section 10, the bridge 20, the second heat exchange section 30 and the connecting member are fixed by welding. The first heat exchange section 10 is larger than the second heat exchange section 30 .

[0041] The first heat exchange section 10 has a heat exchange core, and the first heat exchange section 10 includes at least two flow paths through which fluids flow and exchange heat, and the two fluid flow paths are separated from each other. The first heat exchange section 10 includes interlayer flow paths separated by stacking of plates, and at least two types of fluids can flow in the first heat exchange section 10, and these two types of fluids can be heat exchanged in the first heat exchange section. For example, one type of fluid may be a refrigerant and the other type may be a cooling liquid, and may be used, for example, to cool a heat-generating element such as a battery or to cool a vehicle interior, or may be for three types of fluids, for example, one type of fluid may be a refrigerant and the other two types may be cooling liquids, and the two types of cooling liquids may be selected to exchange heat with the refrigerant by control, and the cooling liquid may be used to cool a member that needs to be cooled after its temperature is lowered by heat exchange. Below, two types of fluids will be described as an example.

[0042] The heat exchange unit has a first connection port 51, a second connection port 52, a third connection port 53, a fourth connection port 54, a fifth connection port 55 and a sixth connection port 56. The first heat exchange section is provided with a first connection port section 101 and a second connection port section 102, the bridge 20 is provided with a third connection port section 211, and the connection member is provided with a fourth connection port 54, a fifth connection port 55 and a sixth connection port 56. The diaphragm element 110 is fixedly mounted or limited in position on the bridge 20 . The first heat exchange section 10 has four holes, for example a first hole 103 and a second hole 104 (the two holes communicating with the cooling liquid are not shown). The first heat exchange section 10 includes a first connection port section 101 and a second connection port section 102, the first connection port section 101 has a first connection port 51 for communicating with a coolant, and the second connection port section 102 has a second connection port 52 for communicating with a coolant, the first connection port 51 and the second connection port 52 are connected by a flow path of the heat exchange core, the first connection port section 101 and the second connection port section 102 may be part of the edge plate of the first heat exchange section, or may be processed separately and fixed to the edge plate and / or heat exchange core of the first heat exchange section by welding, and the first connection port section and the second connection port section may further be fixed to the first heat exchange section in the form of a pipe connecting member.

[0043] The bridge 20 has a first engagement portion 200 and a second engagement portion 200', and correspondingly, the first heat exchange portion 10 has an engagement portion 100 that corresponds to and engages with the first engagement portion 200 of the bridge, and the second heat exchange portion 30 has an engagement portion 300 that corresponds to and engages with the second engagement portion 200' of the bridge, and the engagement portion 100 of the first heat exchange portion 10, the engagement portion 300 of the second heat exchange portion 30 and the two engagement portions of the bridge all include flat portions. The openings of the communication holes or grooves or conductive parts on the first engagement part 200 side of the bridge are located inside the first engagement part and each communication opening is surrounded by the first engagement part, and the first heat exchange part has a corresponding communication opening at a position corresponding to the position of each communication opening of the bridge, and each communication opening of the first heat exchange part is located inside the engagement part and each communication opening is surrounded by the engagement part. In this way, after the engaging portion 100 of the first heat exchange portion 10 and the first engaging portion 200 of the bridge are welded and sealed, the communicating port of the bridge can communicate with the communicating port corresponding to the first heat exchange portion, or the periphery of each communicating port includes a portion of the engaging portion, and both form an approximately closed structure together with the engaging portion provided opposite to each other. The first heat exchange section 10 has an opening of the first hole passage 103 and an opening of the second hole passage 104 on the side facing the bridge 20, and the bridge 20 has corresponding holes 2084 and 2091 on the side facing the first heat exchange section 10, with the opening of hole 2084 corresponding in position to the opening of the first hole passage 103 of the first heat exchange section, and the opening of hole 2091 corresponding in position to the opening of the second hole passage 104 of the first heat exchange section. The bridge 20 further has a groove 2080 on the side facing the first heat exchange section 10, the groove 2080 communicating with a hole 2081', and further has one oblique hole 2082 on the other side of the groove, the other side of which is connected to a hole in the mounting section 209. Thus, the hole in the mounting section 209 is connected to the hole 2081' via the oblique hole 2082 and the groove 2080.

[0044] The engaging portion 300 of the second heat exchange portion 30 and the second engaging portion 200' of the bridge are positioned in correspondence with each other, and after the two are welded and sealed, the communication opening on that side of the bridge corresponds to and communicates with the communication opening of the second heat exchange portion. Specifically, the second heat exchange section 30 has the mouths of three holes on the side facing the bridge 20, namely, the mouths of the third hole 301, the fourth hole 302 and the first hole 303, and the bridge 20 has the mouths of the fluid guide hole 202, the mouth of the hole 2081' and the mouth of the hole 2084 on the side facing the second heat exchange section 30, and the mouths of the third hole 301 and the fluid guide hole 202 of the second heat exchange section correspond in position, the mouths of the fourth hole 302 and the mouth of the hole 2081' correspond in position, and the mouths of the first hole 303 and the mouths of the hole 2084 correspond in position.

[0045] The bridge 20 includes a third connection port portion 211 , a second mounting portion 207 , and a mounting portion 209 . The third connection port portion 211 has a third connection port 53, and the third connection port portion 211 includes a structure that protrudes outward. The third connection port portion 211 may be a structure that is integrated with the main body of the bridge, or may be a structure that is processed separately and fixed to the main body of the bridge by welding. The second mounting portion 207 is used to engage and mount the sensing element 250 , and the mounting portion 209 is used to engage and mount the diaphragm element 110 . The hole of the second mounting part 207 communicates with the hole 2084, the sensing element is, for example, a temperature sensor, and the temperature sensing head 2501 is positioned in the flow path through the second mounting part 207 where the hole 2084 is located, and in this way, the temperature of the refrigerant after passing through the first heat exchange part or the outlet temperature of the evaporator can be obtained.

[0046] In addition, the bridge 20 is provided with four through holes 2032 to reduce the weight of the bridge and the area of ​​the flat surface that supports welding, thereby improving the welding quality. The bridge 20 is further provided with fixing holes 221 for fixing.

[0047] The connection member includes a connection 1 part 441 and a connection 2 part 442, and the connection 1 part 441 includes the fourth connection port . The connection 2 part 442 has a fifth connection port 55 and a sixth connection port 56, and the connection 1 part 441 has a space which corresponds to and engages with the first hole 303 of the second heat exchange part 30 so as to realize a flow path from the first hole 303 to the fourth connection port, and may be fixed at a corresponding position around the first hole 303 in the manner of a joint. The fifth connection port 55 of the connection 2 part 442 corresponds to and engages with the fourth hole passage 302 of the second heat exchange part 30, and the sixth connection port 56 of the connection 2 part 442 corresponds to and engages with the second hole passage 304 of the second heat exchange part 30. The connection member may further include a fixing member 450 for fixing or limiting its position, and the connection 1 part 441 and the connection 2 part 442 may have a fixing hole 409, and the fixing member 450 can be provided to be fixed or limit its position in the fixing hole 409.

[0048] The heat exchange unit can facilitate the mounting and connection of the thermal management system, reduce the number of connecting pipes, and reduce the volume of the system. This heat exchange unit is applied to a vehicle thermal management system as an example, and will be described in detail below. In actual use, these components are fixed, and the flow pattern of the refrigerant is shown in this exploded view. In an exemplary vehicle thermal management system, the vehicle thermal management system includes a coolant system and a battery thermal management system. And, referring to FIG. 30 and other figures, the battery thermal management system includes a flow path portion communicating with the first connection port portion 101, the second connection port portion 102 of the heat exchange unit and the first connection port and the second connection port of the first heat exchange portion, and the heat of the battery can be transferred to the coolant, which flows through the flow path of that portion of the first heat exchange portion via the first connection port 51 or the second connection port 52 and exchanges heat with a refrigerant in another flow path in the first heat exchange portion, and the coolant returns further after its temperature has been lowered to cool the battery. In addition, the third connection port 53, the fourth connection port 54, the fifth connection port 55, and the sixth connection port 56 are used for communication of the refrigerant system, for example, the refrigerant cooled by the condenser enters the heat exchange unit through the third connection port 53 and the bridge, or the refrigerant through the reservoir enters the heat exchange unit through the third connection port 53. In this way, the high temperature and high pressure refrigerant reaches the third hole passage 301 of the second heat exchange section through the fluid guide hole 202, and after heat exchange with the refrigerant of another flow path in the second heat exchange section 30, it reaches the fourth hole passage 302, and the refrigerant that reaches the fourth hole passage 302 is divided into both parts. That is, a portion flows out from the fifth connection port 55 via the connection 2 part 432 and is connected, for example, to a pre-evaporator or another evaporator via the fifth connection port 55, and a throttling element may further be provided before the pre-evaporator. The other part of the refrigerant enters the throttling element 110 through the hole 2081' of the bridge, the groove 2080 and the oblique hole 2082, is throttled by the throttling element 110, and then reaches the second hole 104 of the first heat exchange section 10 through the hole 2091. In the refrigerant flow path of the first heat exchange section, the refrigerant exchanges heat with the coolant in the coolant flow path. The refrigerant reaches the first hole 103, and then flows out through the hole 2084 of the bridge, the first hole 303 of the second heat exchange section, and the fourth connection port communicating with the first hole 303. The sixth connection port 56 may be used to communicate the refrigerant returned from the pre-evaporator or another evaporator, and this portion of the low-temperature refrigerant flows through the second hole passage 304 of the second heat exchanger to the first hole passage 303, and exchanges heat with the high-temperature refrigerant flowing from the third hole passage 301 to the fourth hole passage 302. In the first hole passage 303, the refrigerants of both portions are joined together and then can be returned to the compressor through the fourth connection port. In this way, some of the low temperature refrigerant is used to cool the high temperature refrigerant, lowering the condensation temperature of the refrigerant and preventing the temperature of the refrigerant returned to the compressor from becoming too high. The flow directions in this specification are for illustrative purposes only and are not limiting or closed requirements, and other components can be added therein, such as adding other control valve components before the compressor, etc.

[0049] Furthermore, a heat exchange unit according to a sixth embodiment is shown in Figures 33 to 37, where Figure 33 is an oblique view of the heat exchange unit according to the sixth embodiment, Figure 34 is an exploded view of the heat exchange unit, Figure 35 is an oblique view of the bridge in the heat exchange unit viewed from two directions, Figure 36 is a front view and a back view of the bridge in Figure 35, and Figure 37 is an oblique view of the connecting member in the heat exchange unit in Figure 33 viewed from two directions. This heat exchange unit includes the first heat exchange section 10, the throttle element 110, the bridge 20, the second heat exchange section 30, and the connecting member 45. The bridge 20 is mostly located between the first heat exchange section 10 and the second heat exchange section 30, and the connecting member 45 is located on the other side of the second heat exchange section 30, i.e., the bridge 20 and the connecting member 45 are respectively provided on both sides of the second heat exchange section, and the first heat exchange section 10, the bridge 20 and the second heat exchange section 30 are fixed by welding, or the first heat exchange section 10, the bridge 20, the second heat exchange section 30 and the connecting member are fixed by welding.

[0050] The first heat exchange section 10 has a heat exchange core, and has two flow paths through which fluids flow and exchange heat, with the two fluid flow paths being spaced apart, and the first heat exchange section 10 includes interlayer flow paths separated by stacking of plates. At least two types of fluids can flow through the first heat exchange section 10, and these two types of fluids can be heat exchanged in the first heat exchange section; for example, one type of fluid can be a refrigerant and the other type can be a cooling liquid, and can be used, for example, to cool a heat-generating element such as a battery, and it can also be for three types of fluids, for example, one type of fluid can be a refrigerant and the other two types can be cooling liquids, and the two types of cooling liquid can be selected to exchange heat with the refrigerant by control, and the cooling liquid can be used to cool a component that requires cooling after its temperature has been lowered by heat exchange; specifically, two types of fluid will be described as an example.

[0051] The heat exchange unit has a first connection port 51, a second connection port 52, a third connection port 53, a fourth connection port 54, a fifth connection port 55 and a sixth connection port 56. The first heat exchange section is provided with a first connection port section 101 and a second connection port section 102, the bridge 20 is provided with a third connection port section 211, and the connection member 45 is provided with a fourth connection port 54, a fifth connection port 55 and a sixth connection port 56. The throttling element 110 is fixedly installed or positionally restricted in the first heat exchange section 10, and the first heat exchange section 10 has four holes, for example, a first hole 103 and a second hole 104 (not all are shown), and the first heat exchange section further has a tube having a communication port 105 in the second hole 104, and the second hole 104 is not connected on the side adjacent to the bridge, and the communication port 105 is connected to the inlet of the throttling element 110. The first connection port portion 101 of the first heat exchange portion 10 has a first connection port 51 for communicating with a coolant, and the second connection port portion 102 has a second connection port 52 for communicating with a coolant, the first connection port 51 and the second connection port 52 are connected by a flow path of the heat exchange core, and the first connection port portion 101 and the second connection port portion 102 may be part of the edge plate of the first heat exchange portion, or may be machined separately and fixed to the edge plate and / or heat exchange core of the first heat exchange portion by welding.

[0052] The bridge 20 has a first engagement portion 200 and a second engagement portion 200', the first heat exchange portion 10 has an engagement portion 100 that engages with the first engagement portion 200 of the bridge, and the second heat exchange portion 30 has an engagement portion 300 that engages with the second engagement portion 200' of the bridge, and the engagement portion 100 of the first heat exchange portion 10, the engagement portion 300 of the second heat exchange portion 30, and the two engagement portions of the bridge all include planar portions. The openings of the communication holes or grooves or conductive parts provided on the first engagement part 200 side of the bridge are all located inside the first engagement part and each of the communication openings is surrounded by the first engagement part, and the first heat exchange part has a corresponding communication opening at a position corresponding to the position of each of the communication openings of the bridge, and each of the communication openings of the first heat exchange part is located inside the engagement part and each of the communication openings is surrounded by the engagement part. In this way, after the engaging portion 100 of the first heat exchange portion 10 and the first engaging portion 200 of the bridge are welded and sealed, the communicating port of the bridge can communicate with the communicating port corresponding to the first heat exchange portion, or the periphery of each communicating port includes a portion of the engaging portion, and both form a roughly closed structure with the engaging portion provided opposite, and the engaging portion 300 of the second heat exchange portion 30 and the second engaging portion 200' of the bridge are positioned correspondingly, and after the two are welded and sealed, both of the communicating ports on that side of the bridge communicate with the communicating port of the second heat exchange portion. Specifically, the second heat exchange section 30 has the mouths of three holes on the side facing the bridge 20, namely, the mouths of the third hole 301, the fourth hole 302, and the first hole 303, and the bridge 20 has the mouth of the fluid guide groove 264, the mouth of the hole 262, and the mouth of the hole 266 on the side facing the second heat exchange section 30, i.e., the second engagement section, and the hole 266 has a passing diameter larger than that of the hole 262, and the mouth of the third hole 301 of the second heat exchange section and the mouth of the fluid guide groove 264 correspond in part at their positions, the mouth of the fourth hole 302 and the mouth of the hole 262 correspond in position, and the mouth of the first hole 303 and the mouth of the hole 266 correspond in position. The fluid guide groove 264 includes a first portion 2641 , a second portion 2642 and a transition portion 2640 . The first portion 2641 is relatively close to the third connection port portion, the second portion 2642 is relatively far from the third connection port portion, and the transition portion 2640 is located between the first portion 2641 and the second portion 2642. The depth of first portion 2641 is greater than the depth of second portion 2642, and the depth of first portion 2641 at a point adjacent to the third connection port portion is greater than or close to half the thickness of the bridge, for example, the depth is greater than or equal to one-third the thickness of the bridge but less than two-thirds the thickness of the bridge, and first portion 2641 is connected to the third connection port. On the side facing the first heat exchange section of the bridge, the first heat exchange section 10 has a communication port 105 that communicates with the mouth of the first hole 103 and the throttling element on the side facing the bridge 20, and the bridge 20 has corresponding third grooves 263 and fourth grooves 265 on the side facing the first heat exchange section 10, the third groove 263 communicates with the small hole 262 and the fourth groove 265 communicates with the large hole 266, a part of the mouth of the fourth groove 265 corresponds in position to the mouth of the first hole 103 of the first heat exchange section, and the mouth of the third groove 263 corresponds to and communicates with the communication port 105 that communicates with the throttling element. The projection of either the fluid guide groove 264 or the third connection port 53 onto the front surface is at least partially located on the third groove 263, and the projection of the fluid guide groove 264 onto the front surface is at least partially located on the fourth groove 265, and the fluid guide groove 264 and the fourth groove 265 have at least a portion facing in opposite directions to each other and are not directly connected to each other. The sequence numbers such as first, second, third, fourth, etc. herein are for distinction and explanation purposes only and do not define the number of grooves or holes.

[0053] The bridge 20 includes a third connection port portion 211, in which a third connection port 53 is provided. The third connection port portion 211 includes a structure that protrudes outward. The third connection port portion 211 may be a structure that is integrated with the main body of the bridge, or may be a structure that is machined separately and fixed to the main body of the bridge by welding. Furthermore, the bridge 20 is provided with two through holes 2032 . The first portion 2641 of the fluid guide groove 264 is close to the third connection port portion, and the second portion 2642 of the fluid guide groove 264 is relatively far from the third connection port portion, the fluid guide groove 264 is installed to extend along approximately the longitudinal direction, the third connection port 53 is connected to the first portion 2641 of the fluid guide groove 264, the depth of the second portion 2642 of the fluid guide groove 264 is less than half the thickness of the bridge, and is therefore not more than 0.4 times the thickness of the bridge, the depth of the fourth groove 265 is less than half the thickness of the bridge, and the depth of the third groove 263 is less than half the thickness of the bridge, and is therefore not more than 0.4 times the thickness of the bridge, and the depth of the fourth groove 265 is less than half the thickness of the bridge, and is also not more than 0.4 times the thickness of the bridge, and the depth of the third groove 263 is not more than 0.4 times the thickness of the bridge. In this way, by providing grooves on both sides of the bridge, relatively independent flow paths can be formed together with the two heat exchange parts, and the overall weight of the unit can be reduced. In this specification, the thickness of the bridge refers to the thickness of the two engagement portions of the bridge. The bridge 20 is further provided with two shoulders 212, 213, which at least partially protrude from the main body portion, and the bridge 20 is provided with a fixing hole 221, with a fixing hole being provided in at least one of the shoulders or in a location adjacent to the shoulder.

[0054] In this specification, the through hole 2032 is for reducing weight and making the bridge suitable for welding to the first heat exchange section and the second heat exchange section, the through hole 2032 penetrates from the side of the bridge close to the first heat exchange section to the side close to the second heat exchange section, the through hole 2032 does not communicate with the hole passage of the first heat exchange section, the through hole 2032 does not communicate with the hole passage of the second heat exchange section, the through hole 2032 does not communicate with the hole or groove for communication of the bridge, and the through hole 2032 is The distance from the through hole 2032 to the communicating hole facing or adjacent to the first heat exchange part of the bridge is 1.5 mm or more, the distance from the through hole 2032 to the communicating groove facing or adjacent to the first heat exchange part of the bridge is 1.5 mm or more, the distance from the through hole 2032 to the communicating hole facing or adjacent to the second heat exchange part of the bridge is 1.5 mm or more, and the distance from the through hole 2032 to the communicating groove facing or adjacent to the second heat exchange part of the bridge is 1.5 mm or more. The connection member 45 includes a main body portion 4510 and an extension portion 4511, the connection member 40 is provided with a fourth connection port 54, a fifth connection port 55 and a sixth connection port 56, and is further provided with a fixing hole 459 for engaging and fixing or limiting the position, the connection member 45 has a groove 455 on the side facing the second heat exchange section 30, the groove 455 having a structure similar to a blind via, the groove 455 extending from the extension portion to a position where the sixth connection port 56 is located, and the groove 455 is connected to the sixth connection port 56. The connection member may further include a fixing member 450 for fixing or limiting a position, and the fixing member 450 can be provided in the fixing hole 409 to be fixed or to limit a position. The second heat exchange section has a fourth hole passage 302, a first hole passage 303 and a second hole passage 304 toward the connecting member 40, and the fourth connection port 54 of the connecting member 40 corresponds to the first hole passage 303, the fifth connection port 55 corresponds to the fourth hole passage 302, and the sixth connection port 56 corresponds to and communicates with the second hole passage 304 via the groove 455.

[0055] The heat exchange unit can facilitate the mounting and connection of the thermal management system, reduce the number of connecting pipes, and reduce the volume of the system. The heat exchange unit is applied to a vehicle thermal management system as an example, and will be described below. In actual use, these components are fixed relative to each other, and the flow pattern of the refrigerant is shown in this exploded view. Specifically, the vehicle thermal management system includes a coolant system and a battery thermal management system. And, referring to FIG. 34 and other figures, the battery thermal management system includes a flow path portion communicating with the first connection port portion 101, the second connection port portion 102 of the heat exchange unit and the first connection port and the second connection port of the first heat exchange portion, and the heat of the battery can be transferred to the coolant, which flows through the flow path of that portion of the first heat exchange portion via the first connection port 51 or the second connection port 52 and exchanges heat with a refrigerant in another flow path in the first heat exchange portion, and the coolant returns further after its temperature has been lowered to cool the battery. The third connection port 53, the fourth connection port 54, the fifth connection port 55, and the sixth connection port 56 are each used for communicating with a refrigerant system. For example, the refrigerant cooled by the condenser enters the heat exchange unit through the third connection port 53, or the refrigerant through the reservoir enters the heat exchange unit through the third connection port 53. In this way, the high temperature and high pressure refrigerant reaches the third hole 301 of the second heat exchange unit through a flow path formed by the space where the bridge and the second heat exchange unit engage and where the fluid guide groove 264 is located, and after exchanging heat with refrigerant in another flow path in the second heat exchange unit 30, reaches the fourth hole 302, and the refrigerant that reaches the fourth hole 302 is divided into both parts. That is, a portion flows out through the connecting member 45 and through the fifth connecting port 55, for example, to a pre-evaporator or another evaporator through the fifth connecting port 55, and a throttling element can be attached before the evaporator, or it can be throttled and then split to lead to two evaporators, or it can be split and throttled and then enter the evaporator, etc. The other part of the refrigerant passes through the hole 262 of the bridge, through the flow path formed by the space where the third groove 263 is located, where the bridge and the engagement part of the first heat exchanger are engaged, and enters the throttling element 110 through the communication port 105 communicating with the throttling element. After being throttled by the throttling element 110, it enters the second hole 104 of the first heat exchanger 10, exchanges heat with the coolant in the coolant flow path in the refrigerant flow path of the first heat exchanger, reaches the first hole 103, passes through the flow path formed by the space where the fourth groove 265 is located, where the bridge and the engagement part of the first heat exchanger are engaged, through the hole 266, reaches the first hole 303 of the second heat exchanger, and flows out through the fourth connection port corresponding to the first hole 303, for example, to return to the compressor. The sixth connection port 56 may also be used to communicate the refrigerant returned from the pre-evaporator and / or other evaporators. This portion of the low-temperature refrigerant flows to the second hole passage 304 of the second heat exchange section through the flow path formed by the space where the groove 455 is located, when the connecting member 45 and the second heat exchange section are engaged, then flows to the first hole passage 303, and exchanges heat with the high-temperature refrigerant flowing from the third hole passage 301 to the fourth hole passage 302. In the first hole passage 303, the refrigerant of both portions merge and can be returned to the compressor through the fourth connection port 54. In this way, a portion of the low-temperature refrigerant is used to cool the high-temperature refrigerant, which can lower the condensation temperature of the refrigerant and prevent the temperature of the refrigerant returned to the compressor from being high. The bridge 20 is further provided with a second mounting portion 207 for mounting a sensing element 250, for example a temperature sensing element, and a temperature sensing head 2501 is passed through the mounting portion and positioned in the flow path where the hole 266 and / or the fourth groove 265 are located, so that the temperature of the refrigerant after passing through the first heat exchange portion or the outlet temperature of the evaporator can be obtained. The second heat exchange section can realize heat exchange between the high-temperature refrigerant and a part of the low-temperature refrigerant, thereby lowering the temperature of the high-temperature refrigerant and preventing the temperature of the refrigerant returning to the compressor from being too high, thereby improving efficiency.

[0056] This heat exchange unit includes a first heat exchange section, a bridge and a second heat exchange section, and the bridge is at least partially located between the first heat exchange section and the second heat exchange section. The bridge makes it relatively convenient to realize a fluid communication manner between the two heat exchange sections, which can be realized by changing the structure of the bridge according to different system requirements, simplifies the system pipeline, reduces the installation of pipelines between the connection ports, and makes the system connection simple and convenient. The refrigerant flow path of the first heat exchange section of the above unit may be a single passage, i.e., a passage flowing from the second hole passage 104 to the first hole passage 103, or it may be three passages, i.e., the horizontal direction of the first heat exchange section is roughly divided into three parts, and the first passage flows from the lowest part of the second hole passage 104 to the lowest part of the first hole passage 103, then from the middle part of the first hole passage 103 to the middle part of the second hole passage 104, and further from the upper part of the second hole passage 104 to the upper part of the first hole passage 103, so that in the embodiment, only the outflow from the first hole passage 103 will be described. In particular, the thickness of the bridge refers to the thickness between the planes of the two engagement parts of the bridge. The flow direction in the text is for explanation only, cannot be limited, and is not a closed requirement, and other components can be added therein, such as adding other control valve components before the compressor, and the like; for example, connecting to the evaporator includes providing a throttling element before the evaporator, and thus having a control valve, and the like; in the text, the second hole 104 of the first heat exchanger is connected to the outlet of the throttling element 110, but when facing the bridge, generally there is no need to provide an opening, and the figure is only for showing the position of the hole. These can be adapted according to the actual system, and the connection situation is based on a specific technical solution. For example, the first connection port is connected to the second connection port, but the situation of connecting to other connection ports can also exist at the same time.

[0057] The above embodiments do not limit the present invention, and are, for example, definitions of directions such as "front", "back", "left", "right", "upper", and "lower". As will be understood by those skilled in the art, the present specification may be amended, combined, or substituted with the present invention, and any improvements that do not deviate from the spirit and scope of the present invention are included in the scope of the present claims.

Claims

1. A heat exchange unit including a first heat exchange section (10), a bridge (20) and a second heat exchange section (30), At least a portion of the bridge (20) is located between the first heat exchange section (10) and the second heat exchange section (30); The first heat exchange section (10), the bridge (20), and the second heat exchange section (30) are fixed by welding, The first heat exchange section (10) has a heat exchange core and includes at least a first fluid passage and a second fluid passage that are not in communication with each other; The heat exchange unit includes a first connection port (51), a second connection port (52) and a third connection port (53); The first heat exchange section (10) includes a first connection port section (101) and a second connection port section (102), The first connection port (51) is disposed in the first connection port portion (101), The second connection port (52) is disposed in the second connection port portion (102), The first connection port (51) and the second connection port (52) are in communication with each other through the first fluid passage, The bridge (20) includes a third connection port portion (211) in which the third connection port (53) is provided, the bridge (20) includes a hole and / or a groove communicating with the third connection port (53); The bridge (20) includes two holes and / or grooves for communication facing the first heat exchange section (10) and includes at least three holes and / or grooves that can communicate with the second heat exchange section (30); The mouth of a hole and / or a groove in the bridge (20) that can communicate with the second heat exchange section (30) faces the second heat exchange section (30), a hole and / or groove communicating with the third connection port (53) in the bridge (20) communicates with one of at least three holes and / or grooves communicating with the second heat exchange section (30) in the bridge (20); A first fluid flows into the first heat exchange unit (10) from the first connection port (51), passes through the first fluid passage, and flows out of the first heat exchange unit (10) from the second connection port (52), or a first fluid flows into the first heat exchange unit (10) from the second connection port (52), passes through the first fluid passage, and flows out of the first heat exchange unit (10) from the first connection port (51), The second fluid enters the second heat exchange section (30) from the third connection port (53) via one of the holes and / or grooves in the bridge (20) that can communicate with the second heat exchange section (30), and then returns from the second heat exchange section (30) to the bridge (20) via another one of the holes and / or grooves in the bridge (20) that can communicate with the second heat exchange section (30), and the second fluid that has returned to the bridge (20) flows back through one of two holes and / or grooves in the bridge (20) for communication that face the first heat exchange section (10). and then flows into the second fluid passage, the second fluid that has flowed into the second fluid passage exchanges heat with the first fluid flowing through the first fluid passage, then re-enters the bridge (20) via the other of the two communicating holes and / or grooves in the bridge (20) facing the first heat exchange section (10), re-enters the second heat exchange section (30) via yet another of the holes and / or grooves in the bridge (20) that can communicate with the second heat exchange section (30), and then flows out of the second heat exchange section (30).

2. The first heat exchange section (10) includes at least a first hole (103) and a second hole (104), and the first hole (103) of the first heat exchange section (10) and the second hole (104) of the first heat exchange section (10) are in communication with each other via the second fluid passage; The second heat exchange section (30) includes a first hole (303), a second hole (304), a third hole (301), and a fourth hole (302), the first hole (303) of the second heat exchange section (30) and the second hole (304) of the second heat exchange section (30) are in communication with each other, and the third hole (301) of the second heat exchange section (30) and the fourth hole (302) of the second heat exchange section (30) are in communication with each other, a hole and / or groove communicating with the third connection port (53) in the bridge (20) communicates with a third hole passage (301) in the second heat exchange section (30) via one of at least three holes and / or grooves in the bridge (20) that can communicate with the second heat exchange section (30), and the second fluid enters the third hole passage (301) in the second heat exchange section (30) from the third connection port (53) via a hole and / or groove communicating with the third connection port (53) in the bridge (20); Another one of the at least three holes and / or grooves in the bridge (20) that can communicate with the second heat exchange section (30) communicates with a fourth hole passage (302) of the second heat exchange section (30), and yet another one of the at least three holes and / or grooves in the bridge (20) that can communicate with the second heat exchange section (30) communicates with a first hole passage (303) of the second heat exchange section (30); The heat exchange unit further includes a throttle element fixed or positioned so as to be restricted in position on the first heat exchange section (10) and a connection member fixedly installed on the second heat exchange section (30), The heat exchange unit further includes a fourth connection port (54), a fifth connection port (55) and a sixth connection port (56); The connection member has the fourth connection port (54), the fifth connection port (55), and the sixth connection port (56), the fourth connection port (54) communicates with a first passage (303) of the second heat exchange section (30), the fifth connection port (55) communicates with a fourth passage (302) of the second heat exchange section (30), and the sixth connection port (56) communicates with a second passage (304) of the second heat exchange section (30); The heat exchange unit of claim 1, characterized in that one of the two holes and / or grooves for communication facing the first heat exchange section (10) in the bridge (20) communicates with a second hole passage (104) of the first heat exchange section (10) via the throttling element, and the other of the two holes and / or grooves for communication facing the first heat exchange section (10) in the bridge (20) communicates with a first hole passage (103) of the first heat exchange section (10).

3. The first heat exchange section (10) includes at least a first hole (103) and a second hole (104), and the first hole (103) of the first heat exchange section (10) and the second hole (104) of the first heat exchange section (10) are in communication with each other via the second fluid passage; The second heat exchange section (30) includes a first hole (303), a second hole (304), a third hole (301), and a fourth hole (302), the first hole (303) of the second heat exchange section (30) and the second hole (304) of the second heat exchange section (30) are in communication with each other, and the third hole (301) of the second heat exchange section (30) and the fourth hole (302) of the second heat exchange section (30) are in communication with each other, a hole and / or groove communicating with the third connection port (53) in the bridge (20) communicates with a third hole passage (301) in the second heat exchange section (30) via one of at least three holes and / or grooves in the bridge (20) that can communicate with the second heat exchange section (30), and the second fluid enters the third hole passage (301) in the second heat exchange section (30) from the third connection port (53) via a hole and / or groove communicating with the third connection port (53) in the bridge (20); The heat exchange unit includes a throttle element (110) that is fixed or fixedly positioned on the bridge (20), The bridge (20) includes a mounting portion (209) for fixing or limiting the position of the diaphragm element (110); the two holes and / or grooves for communication in the bridge (20) facing or adjacent to the first heat exchanger part (10) include a hole (2091) located in or belonging to a part of the mounting part (209); The outlet of the throttle element (110) communicates with the second hole (104) of the first heat exchange section (10) through a hole (2091) located in the mounting section (209); the other of the two communication holes and / or grooves facing the first heat exchange section (10) in the bridge (20) communicates with a first hole passage (103) in the first heat exchange section (10), and yet another of the at least three holes and / or grooves capable of communicating with the second heat exchange section (30) in the bridge (20) communicates with a first hole passage (303) in the second heat exchange section (30); the bridge (20) has holes and / or grooves communicating with the inlet of the diaphragm element (110); 2. The heat exchange unit according to claim 1, wherein the inlet of the throttle element (110) communicates with a fourth hole passage (302) of the second heat exchange section (30) via the hole and / or groove.

4. The bridge (20) includes three holes and / or grooves that can communicate with the second heat exchange section (30), a first passage (103) of the first heat exchange section (10) communicates with a first passage (303) of the second heat exchange section (30) via the hole and / or groove of the bridge (20); a third connection port (53) of the heat exchange unit communicates with a third hole (301) of the second heat exchange section (30) through another hole and / or groove of the bridge (20); The heat exchange unit further includes a connecting member located on a side of the second heat exchange portion (30) away from the bridge (20), The connection member has a fourth connection port (54), a fifth connection port (55) and a sixth connection port (56); The fourth connection port (54) communicates with the first passage (303) of the second heat exchange section (30); The fifth connection port (55) communicates with a fourth hole (302) of the second heat exchange section (30); 4. The heat exchange unit according to claim 3, wherein the sixth connection port (56) communicates with a second passage (304) of the second heat exchange section (30).

5. The size of the second heat exchanger is equal to or smaller than the size of the first heat exchanger (10); At least a portion of the mounting portion (209) protrudes from the second heat exchange portion (30), At least a portion of the third connection port portion (211) protrudes from the second heat exchange portion (30); The bridge (20) has a corresponding flow hole (2084) on the side facing the first heat exchange section (10), The hole (2084) is adjacent to the first hole (103) of the first heat exchange section (10) and communicates with the first hole (103) of the first heat exchange section (10); The hole (2091) located in the mounting portion (209) of the bridge (20) communicates with the second hole (104) of the first heat exchange portion (10); The bridge (20) further has a groove (2080) on a side facing the first heat exchange section (10) and relatively close to the mounting section (209), The bridge (20) includes holes (2081, 2081') passing through it, One side of the groove (2080) has the through hole (2081, 2081'), or one side of the groove communicates with the through hole (2081, 2081'), and the other side of the groove (2080) further has an oblique hole (2082) communicating with the inlet of the diaphragm element (110) or the space in which the inlet of the diaphragm element (110) is located; The inlet of the diaphragm element (110) communicates with the groove (2080) through the oblique hole (2082); The heat exchange unit according to claim 4, characterized in that the inlet of the throttling element (110) is connected to the fourth hole passage (302) of the second heat exchange section (30) via the oblique hole (2082), the groove (2080), and the holes (2081, 2081').

6. The bridge (20) is provided with holes and / or grooves (202, 202', 264) communicating with the third connection port (53) on the side facing the second heat exchange section (30), The holes and / or grooves (202, 202′, 264) are provided adjacent to the third connection port portion (211); the holes and / or grooves (202, 202', 264) have at least a portion of a depth greater than or equal to half the thickness of the bridge (20); the mouths of the holes and / or grooves (202, 202', 264) at least partially correspond to or communicate with the third passages (301) of the second heat exchange section (30); A heat exchange unit as described in any one of claims 2 to 5, characterized in that the holes and / or grooves (202, 202', 264) are not connected to other communicating holes and / or grooves of the bridge (20).

7. The bridge (20) is provided with a fluid guide hole (202, 202') communicating with the third connection port (53) on the side facing the second heat exchange section (30), The fluid guide hole (202, 202') is provided adjacent to the third connection port portion (211), and the depth of the fluid guide hole (202, 202') is equal to or greater than one-third of the thickness of the bridge (20) and less than two-thirds of the thickness of the bridge (20); The fluid guide holes (202, 202') communicate with or correspond to the third passages (301) of the second heat exchange section (30); The bridge (20) further includes a through hole (206), a first groove (203), a second groove (205), and a conductive portion (204); The conductive portion (204) includes a hole (2041) and a groove (2042), The first groove (203) is provided on the side opposite to the second heat exchange section (30), The second groove (205) and the groove (2042) of the conductive portion (204) are provided on a side facing the first heat exchange portion (10), The first groove (203) and the second groove (205) communicate with each other via the through hole (206), The first groove (203) communicates with a fourth hole (302) of the second heat exchange section (30), The first hole (103) of the first heat exchange section (10) is connected to the first hole (303) of the second heat exchange section (30) via the conductive portion (204) of the bridge (20), A side of the bridge (20) facing the first heat exchange section (10) is defined as a front side, and a side of the bridge (20) facing the second heat exchange section (30) is defined as a back side, and at least a portion of the projection of the first groove (203) onto the front side is located in a groove (2042) of the conductive section (204); 3. The heat exchange unit according to claim 2, characterized in that the projection of the fluid guide hole (202, 202') onto the front surface is at least partially located in the second groove (205).

8. a side of the bridge (20) facing the first heat exchange section (10) is defined as a front side, and a side of the bridge (20) facing the second heat exchange section (30) is defined as a back side, and the bridge (20) is provided with a fluid guide groove (264) on the back side thereof, and two holes, a small hole (262) and a large hole (266) that is larger than the small hole (262); The fluid guide groove (264) communicates with the third connection port (53); The fluid guide groove includes a first portion (2641) that is relatively close to the third connection port portion (211) and a second portion (2642) that is relatively far from the third connection port portion (211), A depth of at least a portion of the first portion (2641) is greater than a depth of the second portion (2642); the first portion (2641) has a depth of at least a portion thereof adjacent to the third connection port (53) that is equal to or greater than half the thickness of the bridge (20); The first portion (2641) is in communication with the third connection port (53), The second heat exchange section (30) has a third hole (301), a fourth hole (302), and an opening of a first hole (303) of the second heat exchange section (30) on a side opposite to the bridge (20), the fluid guide groove (264), the small hole (262), and the large hole (266) of the bridge (20) are respectively connected to one of the third hole (301), the fourth hole (302), and the first hole (303) of the second heat exchange section (30); The bridge (20) has two grooves, a third groove (263) and a fourth groove (265), on the side facing the first heat exchange section (10), The third groove (263) communicates with the small hole (262), The fourth groove (265) communicates with the large hole (266), the first passage (103) of the first heat exchange section (10) communicates with one passage of the second heat exchange section (30) via the fourth groove (265) and the large hole (266), and / or communicates with the small hole (262) and one passage of the second heat exchange section (30) via the third groove (263); A projection of one of the fluid guide groove (264) and the third connection port (53) onto a front surface is at least partially located on the third groove (263); 3. The heat exchange unit according to claim 2, characterized in that the projection of the fluid guide groove (264) onto the front surface is at least partially located in the fourth groove (265).

9. The bridge (20) has a first engagement portion (200) and a second engagement portion (200'), The first heat exchange section (10) has an engagement section (100), The engagement portion (100) of the first heat exchange portion (10) is correspondingly engaged with the first engagement portion (200) of the bridge (20) so as to be fixed by welding; The second heat exchange section (30) has an engagement section (300), the engaging portion (300) of the second heat exchange portion (30) is correspondingly engaged with the second engaging portion (200') of the bridge (20) so as to be fixed by welding; The engaging portion (100) of the first heat exchange portion (10), the engaging portion (300) of the second heat exchange portion (30), and the two engaging portions of the bridge (20) each include a flat portion; The mouth of a hole and / or a groove for communication in the bridge (20) facing or adjacent to the first heat exchange section (10) is located inside the first engagement section (200); A heat exchange unit as described in any one of claims 1 to 8, characterized in that the mouth portion of the hole and / or groove in the bridge (20) that can communicate with the second heat exchange section (30), which is adjacent to the second heat exchange section (30), is located inside the second engagement portion (30).

10. The bridge (20) further includes at least one lightening hole (2032); The lightening hole (2032) does not communicate with the passages of the first heat exchange section (10), the passages of the second heat exchange section (30), or the communication holes and / or grooves of the bridge (20); a distance from the lightening hole (2032) to the hole and / or groove for communication facing the first heat exchange section (10) in the bridge (20) is 1.5 mm or more; A heat exchange unit as described in any one of claims 1 to 8, characterized in that the distance from the hollowed-out hole (2032) to the hole and / or groove for communication facing the second heat exchange section (30) in the bridge (20) is 1.5 mm or more.

11. The lightening holes (2032) include two or more, At least one of the lightening holes (2032) is non-circular; 11. Heat exchange unit according to claim 10, characterized in that the bridge (20) is further provided with at least one notch (2031).

12. a part of a first engagement portion (200) of the bridge (20) is interposed between the lightening hole (2032) and the hole and / or groove for communication facing the first heat exchange portion (10) in the bridge (20); The heat exchange unit described in claim 11, characterized in that a part of the second engagement portion (200') of the bridge (20) is interposed between the lightening hole (2032) and the hole and / or groove for communication facing the second heat exchange portion (30) in the bridge (20).

Images