Thermosyphon heat exchanger

Abstract

The utility model provides a kind of thermosyphon heat exchange device.The utility model includes first heat exchanger, second heat exchanger, first pipeline, second pipeline and first one-way flow channel.First heat exchanger is located in high temperature area;Second heat exchanger is located in low temperature area;First pipeline is used to guide gaseous refrigerant in first heat exchanger into second heat exchanger;Second pipeline is used to guide liquid refrigerant in second heat exchanger into first heat exchanger;First one-way flow channel is connected in series on first pipeline, so that gaseous refrigerant in first heat exchanger flows unidirectionally to second heat exchanger;The utility model designs one-way flow channel in split heat exchanger, which can enhance the smoothness of refrigerant unidirectional flow in the whole thermosyphon heat exchanger, promote efficient reciprocating circulation of refrigerant between evaporation and condensation, improve the heat exchange efficiency of first heat exchanger and second heat exchanger, and has the advantages of passive heat dissipation, no maintenance, high heat exchange efficiency, high heat exchange performance, etc.

Description

Technical Field

[0001] This utility model relates to thermal management equipment, and more particularly to a thermosiphon heat exchange device. Background Technology

[0002] In the high heat flux density chip industry, thermal management technology for energy storage PCS is a core element in ensuring the efficient, safe, and long-life operation of the entire system. Power electronic devices (such as IGBTs and SiC MOSFETs) generate significant heat under high-frequency switching and high-power conditions. Currently, active cooling technologies, including active water cooling and immersion liquid cooling, are the primary solutions. However, active cooling technologies require regular manual maintenance, resulting in high maintenance costs. Furthermore, with increasing pyrolysis power consumption, existing thermal management technologies become more complex and the equipment larger. Therefore, it is necessary to provide a thermosiphon heat exchange device to overcome the aforementioned shortcomings. Utility Model Content

[0003] The purpose of this invention is to provide a thermosiphon heat exchange device.

[0004] According to one aspect of the present invention, a thermosiphon heat exchange device is provided, comprising: a first heat exchanger, wherein the first heat exchanger is disposed in a high-temperature region and is filled with a refrigerant, the first heat exchanger is capable of receiving heat from the outside, and the refrigerant changes from a liquid phase to a gaseous phase and flows upward; a second heat exchanger, wherein the second heat exchanger is disposed in a low-temperature region, the upper part of the second heat exchanger is higher than the upper part of the first heat exchanger, the second heat exchanger is capable of outputting heat to the outside, and the refrigerant changes from a gaseous phase to a liquid phase and flows downward; and a first pipe, the first pipe being used to connect the first heat exchanger to the second heat exchanger. A heat exchanger and a second heat exchanger, wherein gaseous refrigerant in the first heat exchanger is introduced into the second heat exchanger; a second pipe, wherein the second pipe is used to connect the second heat exchanger and the first heat exchanger, and wherein liquid refrigerant in the second heat exchanger is introduced into the first heat exchanger; a first unidirectional flow channel, wherein the first unidirectional flow channel is connected in series with the first pipe, so that gaseous refrigerant in the first heat exchanger flows unidirectionally into the second heat exchanger; and / or a second unidirectional flow channel, wherein the second unidirectional flow channel is connected in series with the second pipe, so that liquid refrigerant in the second heat exchanger flows unidirectionally into the first heat exchanger.

[0005] Preferably, the first heat exchanger includes: a first manifold arranged horizontally, a second manifold arranged parallel to and higher than the first manifold, and a first flat tube disposed between the first manifold and the second manifold.

[0006] Preferably, the second heat exchanger is arranged vertically or inclined along the vertical direction. The second heat exchanger includes: a third manifold, a fourth manifold arranged parallel to the third manifold and lower than the third manifold, and a second flat tube disposed between the third manifold and the fourth manifold.

[0007] Preferably, a partition plate is provided between the first heat exchanger and the second heat exchanger to form a high-temperature zone and a low-temperature zone.

[0008] Preferably, the first heat exchanger includes a first plate and a second plate fixedly connected by brazing, and a first cavity, a second cavity and a third unidirectional flow channel are formed between the first plate and the second plate. The third unidirectional flow channel connects the first cavity and the second cavity, so that the gaseous refrigerant in the first cavity flows unidirectionally to the second cavity.

[0009] Preferably, the first unidirectional flow channel, the second unidirectional flow channel, and the third unidirectional flow channel have the same structure; the first unidirectional flow channel includes a main flow path and a branch flow path, and both ends of the branch flow path are connected to the main flow path; when the refrigerant flows in the forward direction, the refrigerant in the main flow path is promoted by the refrigerant in the branch flow path at the confluence point of the branch flow path and the main flow path; when the refrigerant flows in the reverse direction, the refrigerant in the main flow path is blocked by the refrigerant in the branch flow path at the confluence point of the branch flow path and the main flow path.

[0010] Preferably, the first cavity is provided with a protrusion, the height of which is the same as the depth of the flow channel region.

[0011] Preferably, the second heat exchanger includes: a horizontally arranged third manifold, a fourth manifold parallel to and higher than the third manifold, and a second flat tube disposed between the third manifold and the fourth manifold.

[0012] Preferably, the first heat exchanger and / or the second heat exchanger are further provided with a liquid injection connector, which is suitable for injecting refrigerant.

[0013] Preferably, the thermosiphon heat exchanger further includes a fan, which drives airflow to exchange heat with the second heat exchanger.

[0014] Compared with existing technologies, the thermosiphon heat exchanger provided by this invention has the following beneficial effects: By designing a unidirectional flow channel in the split heat exchanger, this invention enhances the smoothness of the unidirectional flow of the refrigerant within the entire thermosiphon heat exchanger, promotes efficient reciprocating circulation of the refrigerant between evaporation and condensation, and improves the heat exchange efficiency of the first and second heat exchangers. The thermosiphon heat exchanger in this invention has advantages such as passive heat dissipation, maintenance-free operation, high heat exchange efficiency, and high heat exchange performance. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the structure of the thermal siphon heat exchanger of this utility model; Figure 2 This is one of the structural schematic diagrams of the thermosiphon heat exchange device in Embodiment 1 of this utility model; Figure 3 This is the second schematic diagram of the thermosiphon heat exchange device in Embodiment 1 of this utility model; Figure 4 This is one of the structural schematic diagrams of the thermosiphon heat exchange device in Embodiment 2 of this utility model; Figure 5 This is the second schematic diagram of the thermosiphon heat exchange device in Embodiment 2 of this utility model; Figure 6 This is a schematic diagram of the structure of the first heat exchanger in Embodiment 2 of this utility model; Figure 7 This is a schematic diagram of the structure of the first heat exchanger in Embodiment 2 of this utility model; Figure 8 This is a schematic diagram of the structure of the first unidirectional flow channel of this utility model; Figure 9 This is a schematic diagram illustrating the principle of forward flow in the first unidirectional flow channel of this utility model. Figure 10 This is a schematic diagram illustrating the principle of reverse flow in the first unidirectional flow channel of this utility model.

[0016] Explanation of reference numerals in the attached drawings: 1. First heat exchanger; 11a. First manifold; 12a. Second manifold; 13a. First flat tube; 11b. First plate; 12b. Second plate; 13b. First cavity; 14b. Second cavity; 15b. Third unidirectional flow channel; 16b. Protrusion; 17b. First interface; 18b. Second interface; 2. Second heat exchanger; 21. Third manifold; 22. Fourth manifold; 23. Second flat tube; 3. First pipeline; 4. Second pipeline; 5a. First unidirectional flow path; 5b. Second unidirectional flow path; 51. Main flow path; 52. Branch flow path; 6. Divider; 7. Liquid injection connector. Detailed Implementation

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0019] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0020] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort. Example 1

[0023] See Figures 1 to 3 This embodiment provides a thermosiphon heat exchange device, which includes: a first heat exchanger 1, a second heat exchanger 2, a first pipe 3, a second pipe 4, and a first unidirectional flow channel 5a.

[0024] The first heat exchanger 1 is located in the high-temperature region. The first heat exchanger 1 includes: a first manifold 11a, a second manifold 12a and a first flat tube 13a. The first manifold 11a and the second manifold 12a are both horizontally arranged. The second manifold 12a is parallel to the first manifold 11a and the second manifold 12a is higher than the first manifold 11a. A plurality of first flat tubes 13a are provided between the first manifold 11a and the second manifold 12a. The first flat tubes 13a are spaced apart along the length direction of the first manifold 11a. The first flat tubes 13a are microchannel heat exchange tubes.

[0025] The second heat exchanger 2 is located in the low-temperature region. The second heat exchanger 2 is vertical or inclined along the vertical direction. The second heat exchanger 2 includes: a third manifold 21, a fourth manifold 22, and a second flat tube 23. The third manifold 21 and the fourth manifold 22 are both horizontally arranged, and the third manifold 21 is parallel to the fourth manifold 22. The third manifold 21 is higher than the fourth manifold 22. Multiple second flat tubes 23 are provided between the third manifold 21 and the fourth manifold 22. The second flat tubes 23 are spaced apart along the length of the third manifold 21. The second flat tubes 23 are microchannel heat exchange tubes.

[0026] The first pipe 3 is used to connect the first heat exchanger 1 and the second heat exchanger 2, and to introduce the gaseous refrigerant in the first heat exchanger 1 into the second heat exchanger 2; the second pipe 4 is used to connect the second heat exchanger 2 and the first heat exchanger 1, and to introduce the liquid refrigerant in the second heat exchanger 2 into the first heat exchanger 1.

[0027] The first manifold 11a is filled with refrigerant, and the refrigerant filling height reaches the middle region of the first flat tube 13a, increasing the heat exchange area of ​​the refrigerant. The first heat exchanger 1 can receive heat from the outside. After being heated, the refrigerant changes from a liquid phase to a gaseous phase and continues to flow upward along the first flat tube 13a into the second manifold 12a. The gaseous refrigerant enters the first heat exchanger along the first pipe 3, and then the gaseous refrigerant is cooled and converted into liquid refrigerant in the second flat tube 23. After the liquid refrigerant is stored in the fourth manifold 22 to a certain amount, it flows back to the first heat exchanger 1 along the second pipe 4.

[0028] Referring to 8 to 10, the first unidirectional flow channel 5a is connected in series with the first pipe 3, so that the gaseous refrigerant in the first heat exchanger 1 flows unidirectionally to the second heat exchanger 2; the first unidirectional flow channel 5a includes a main flow channel 51 and a branch flow channel 52. The angle between the two flow channels at the connection point of the branch flow channel and the main flow channel 51 near the second heat exchanger 2 is an acute angle, and the angle between the two flow channels at the connection point of the branch flow channel 52 and the main flow channel 51 near the first heat exchanger 1 is an obtuse angle.

[0029] When the gaseous refrigerant flows from the first heat exchanger 1 to the second heat exchanger 2 in the forward direction, the refrigerant in the main flow path 51 is promoted by the refrigerant in the branch flow path 52 at the confluence point of the branch flow path 52 and the main flow path 51; when the gaseous refrigerant flows from the second heat exchanger 2 to the first heat exchanger 1 in the reverse direction, the refrigerant in the main flow path 51 is hindered by the refrigerant in the branch flow path 52 at the confluence point of the branch flow path 52 and the main flow path 51.

[0030] By designing a first unidirectional flow channel 5a in the connecting pipe between the first heat exchanger 1 and the second heat exchanger 2, the smoothness of the unidirectional flow of the refrigerant inside the entire thermosiphon heat exchanger can be enhanced, promoting the efficient reciprocating circulation of the refrigerant between evaporation and condensation, thereby improving the heat exchange efficiency of the first heat exchanger 1 and the second heat exchanger 2. The first unidirectional flow channel 5a can also accelerate the flow speed of the heated and evaporated gaseous refrigerant inside the first heat exchanger 1, meeting the higher heat exchange requirements of the heat exchanger.

[0031] A partition plate 6 is provided between the first heat exchanger 1 and the second heat exchanger 2. The upper part of the partition plate 6 is connected to the first pipe 3, and the lower part of the partition plate 6 is connected to the second pipe 4. The partition plate 6 divides the space into a high-temperature zone and a low-temperature zone. The first heat exchanger 1 and / or the second heat exchanger 2 are also provided with a liquid injection joint 7, which is suitable for injecting refrigerant. In this embodiment, phase change refrigerant is injected into the second manifold 12a. After the refrigerant injection is completed, the injection joint can be sealed.

[0032] This type of split-type thermosiphon heat exchanger has many advantages, such as good heat exchange effect, simple structure, versatile form, wide adaptability and low maintenance cost. It can easily meet the high heat exchange demand of industries such as energy storage and data centers in recent years, and achieve green and sustainable energy development. Example 2

[0033] See Figure 4 , 5 This embodiment provides a thermosiphon heat exchange device, which includes: a first heat exchanger 1, a second heat exchanger 2, a first pipe 3, a second pipe 4, and a second unidirectional flow channel 5b.

[0034] The first heat exchanger 1 is located in a high-temperature region and is in direct contact with high-temperature electronic components. The first heat exchanger 1 includes an evaporator plate, which includes a first plate body 11b and a second plate body 12b. The first plate body 11b and the second plate body 12b are fixedly connected by brazing. The cavity structure between the first plate body 11b and the second plate body 12b is the flow channel region.

[0035] The cavity structure can be formed on the first plate 11b and / or the second plate 12b by milling, die casting, or casting. In this embodiment, the first plate 11b is used as the flow channel plate and the second plate 12b is used as the cover plate. The front of the first plate 11b forms a downwardly recessed flow channel region. The flow channel region includes a first cavity 13b and a second cavity 14b that communicates with the first cavity 13b.

[0036] The second plate 12b is mounted on the first plate 11b. The second plate 12b has a first interface 17b and a second interface 18b. The first interface 17b is located in the area where the first cavity 13b is located, and the second interface 18b is located in the area where the second cavity 14b is located. The evaporator and condenser are combined through the first interface 17b and the second interface 18b to form a thermosiphon heat exchanger, thereby achieving thermal management of the energy storage device.

[0037] See appendix Figure 7 To improve the heat exchange performance of the evaporator plate and the pressure resistance of the product, protrusions 16b are distributed within the first cavity 13b, with the height of the protrusions 16b being the same as the depth of the first cavity 13b. The presence of the protrusions 16b can increase the heat exchange specific surface area of ​​the evaporator plate, as well as turbulence and improve the heat exchange performance of the product. More importantly, the protrusions 16b can also be welded to the second plate 12b through a subsequent brazing process, thereby improving the pressure resistance of the entire evaporator plate.

[0038] The second heat exchanger 2 includes: a third manifold 21, a fourth manifold 22, and a second flat tube 23. The third manifold 21 and the fourth manifold 22 are arranged horizontally. The fourth manifold 22 is parallel to the third manifold 21 and higher than the third manifold channel. The second flat tube 23 is located between the third manifold 21 and the fourth manifold 22.

[0039] See appendix Figure 5 The third manifold 21 and the fourth manifold 22 have the same structure. The third manifold 21 includes two cavities that are parallel and interconnected in the vertical direction. Two sets of second flat tubes 23 are disposed between the third manifold 21 and the fourth manifold 22. The second manifold 12a is uniformly arranged along the length of the third manifold 21 and the fourth manifold 22. This arrangement improves the integration of the second heat exchanger 2 and reduces the overall volume of the thermosiphon heat exchange device. In addition, to improve the heat exchange efficiency of the second heat exchanger 2, the thermosiphon heat exchange device also includes a fan, which drives the airflow to exchange heat with the first heat exchanger 1.

[0040] Referring to 8 to 10, the second unidirectional flow channel 5b is connected in series with the second pipe 4, allowing the liquid refrigerant in the second heat exchanger 2 to flow unidirectionally into the first heat exchanger 1. The second unidirectional flow channel 5b includes a main flow channel 51 and a branch flow channel 52. The angle between the two flow channels at the connection point of the branch flow channel and the main flow channel 51 near the first heat exchanger 1 is an acute angle, and the angle between the two flow channels at the connection point of the branch flow channel 52 and the main flow channel 51 near the second heat exchanger 2 is an obtuse angle.

[0041] When the liquid refrigerant flows from the second heat exchanger 2 to the first heat exchanger 1 in the forward direction, the refrigerant in the main flow path 51 is promoted by the refrigerant in the branch flow path 52 at the confluence point of the branch flow path 52 and the main flow path 51; when the liquid refrigerant flows from the first heat exchanger 1 to the second heat exchanger 2 in the reverse direction, the refrigerant in the main flow path 51 is blocked by the refrigerant in the branch flow path 52 at the confluence point of the branch flow path 52 and the main flow path 51.

[0042] By designing a second unidirectional flow channel 5b in the connecting pipe between the first heat exchanger 1 and the second heat exchanger 2, the smoothness of the unidirectional flow of the refrigerant inside the entire thermosiphon heat exchanger can be enhanced, promoting the efficient reciprocating circulation of the refrigerant between evaporation and condensation, thereby improving the heat exchange efficiency of the first heat exchanger 1 and the second heat exchanger 2. The second unidirectional flow channel 5b can also accelerate the flow speed of the heated and evaporated gaseous refrigerant inside the first heat exchanger 1, meeting the higher heat exchange requirements of the thermosiphon heat exchange device. Example 3

[0043] Based on Example 2, this example improves the structure of the first heat exchanger 1, as detailed in the appendix. Figure 7 A third unidirectional flow channel 15b is provided on the first plate 11b, which connects the first cavity 13b and the second cavity 14b. This allows the gaseous refrigerant in the first cavity 13b to flow unidirectionally into the second cavity 14b. Arranging this structure along the internal working fluid circulation path of the product accelerates the flow of the working fluid, promotes unidirectional refrigerant flow, prevents backflow of the working fluid, and increases the thermally driven pressure difference. This effectively improves the heat exchange performance of the product and meets the heat dissipation requirements of higher power applications. The third unidirectional flow channel 15b includes at least one unidirectional flow-stopping structure. These unidirectional flow-stopping structures are often arranged continuously within the channel to achieve optimal structural utilization. However, in some special cases, multiple unidirectional flow-stopping structures can be arranged in segments to meet product performance requirements.

[0044] The third unidirectional flow channel 15b includes a main flow path 51 and a branch flow path 52. The main flow path 51 connects the first cavity 13b and the second cavity 14b. Both ends of the branch flow path 52 are connected to the main flow path 51. The angle between the two flow paths at the connection point of the branch flow path 52 and the main flow path 51 near the first cavity 13b is acute, and the angle between the two flow paths at the connection point of the branch flow path 52 and the main flow path 51 near the first cavity 13b is obtuse. (See appendix) Figure 9When the refrigerant flows forward from the first cavity 13b to the second cavity 14b, the refrigerant in the main flow path 51 is promoted by the refrigerant in the branch flow path 52 at the confluence point of the branch flow path 52 and the main flow path 51. (See appendix) Figure 10 When the refrigerant flows in reverse from the second cavity 14b to the first cavity 13b, the refrigerant in the main flow path 51 is obstructed by the refrigerant in the branch flow path 52 at the confluence point of the branch flow path 52 and the main flow path 51.

[0045] See appendix Figure 3 To improve the heat exchange performance of the first heat exchanger 1 and the pressure resistance of the product, a protrusion 16b is provided inside the first cavity 13b, the height of which is the same as the depth of the first cavity 13b. The presence of the protrusion 16b can both increase the heat exchange specific surface area of ​​the evaporator plate and also play a role in turbulence, increasing flow and improving the heat exchange performance of the product. In addition, the protrusion 16b can also be welded to the second plate 12b through a subsequent brazing process, thereby improving the pressure resistance of the entire evaporator plate.

[0046] The protrusion 16b can be designed with a cross-section of one or more shapes, such as circular, elliptical, or polygonal, according to design and processing requirements. The column cross-sectional area of ​​the protrusion 16b ranges from 0.01 to 10000 mm². 2 Meanwhile, flow guiding components are set in areas where local eddies are easily generated and fluid is easily stagnant in the flow channel plate. An arc-shaped structure is formed at the corner of the first cavity 13b, and the flow channel, which was originally a right-angle structure, is designed as an arc structure to promote smoother fluid flow.

[0047] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A thermosiphon heat exchanger, characterized in that, include: The first heat exchanger is located in a high-temperature area and is filled with refrigerant. The first heat exchanger can receive heat from the outside, and the refrigerant changes from a liquid phase to a gaseous phase and flows upward. The second heat exchanger is located in the low-temperature region. The upper part of the second heat exchanger is higher than the upper part of the first heat exchanger. The second heat exchanger can output heat to the outside, and the refrigerant changes from a gaseous state to a liquid state and flows downward. The first pipe is used to connect the first heat exchanger and the second heat exchanger, and to introduce the gaseous refrigerant in the first heat exchanger into the second heat exchanger. The second pipe is used to connect the second heat exchanger and the first heat exchanger, and to introduce the liquid refrigerant in the second heat exchanger into the first heat exchanger. A first unidirectional flow channel, connected in series with the first pipe, allows gaseous refrigerant in the first heat exchanger to flow unidirectionally to the second heat exchanger; and / or The second unidirectional flow channel is connected in series with the second pipe, so that the liquid refrigerant in the second heat exchanger flows unidirectionally to the first heat exchanger.

2. The thermosiphon heat exchanger as described in claim 1, characterized in that, The first heat exchanger includes: a first manifold arranged horizontally, a second manifold arranged parallel to and higher than the first manifold, and a first flat tube disposed between the first manifold and the second manifold.

3. The thermosiphon heat exchanger as described in claim 2, characterized in that, The second heat exchanger is installed vertically or inclined along the vertical direction. The second heat exchanger includes: a third manifold, a fourth manifold installed parallel to the third manifold and lower than the third manifold, and a second flat tube installed between the third manifold and the fourth manifold.

4. The thermosiphon heat exchanger as described in claim 3, characterized in that, A partition plate is provided between the first heat exchanger and the second heat exchanger to form a high-temperature zone and a low-temperature zone.

5. The thermosiphon heat exchanger as described in claim 1, characterized in that, The first heat exchanger includes a first plate and a second plate fixedly connected by brazing. A first cavity, a second cavity, and a third unidirectional flow channel are formed between the first plate and the second plate. The third unidirectional flow channel connects the first cavity and the second cavity, so that the gaseous refrigerant in the first cavity flows unidirectionally to the second cavity.

6. The thermosiphon heat exchanger as described in claim 5, characterized in that, The first unidirectional flow channel, the second unidirectional flow channel, and the third unidirectional flow channel have the same structure; the first unidirectional flow channel includes a main flow path and a branch flow path, and both ends of the branch flow path are connected to the main flow path; when the refrigerant flows in the forward direction, the refrigerant in the main flow path is promoted by the refrigerant in the branch flow path at the confluence point of the branch flow path and the main flow path; when the refrigerant flows in the reverse direction, the refrigerant in the main flow path is blocked by the refrigerant in the branch flow path at the confluence point of the branch flow path and the main flow path.

7. The thermosiphon heat exchanger as described in claim 5, characterized in that, The first cavity is provided with a protrusion, the height of which is the same as the depth of the flow channel region.

8. The thermosiphon heat exchanger as described in claim 5, characterized in that, The second heat exchanger includes: a horizontally arranged third manifold, a fourth manifold parallel to and higher than the third manifold, and a second flat tube disposed between the third manifold and the fourth manifold.

9. The thermosiphon heat exchanger as described in any one of claims 1 to 8, characterized in that, The first heat exchanger and / or the second heat exchanger are also provided with a liquid injection connector, which is suitable for injecting refrigerant.

10. The thermosiphon heat exchanger as described in any one of claims 1 to 8, characterized in that, The thermosiphon heat exchange device also includes a fan, which drives airflow to exchange heat with the second heat exchanger.

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