Phase change heat dissipation device and heat dissipation system

Abstract

The invention provides a phase change heat dissipation device and a heat dissipation system. The phase change heat dissipation device comprises an evaporation substrate and a condensation flat pipe which are perpendicular to each other. An evaporation flow channel group is formed in the evaporation substrate, and a condensation flow channel group is formed in the condensation flat tube; the evaporation flow channel group comprises at least two evaporation flow channel sections which are arranged at intervals, and the condensation flow channel group comprises at least two condensation flow channel sections which are arranged at intervals; the evaporation flow channel sections and the condensation flow channel sections are sequentially and alternately connected to form a loop. The phase change heat dissipation device and the heat dissipation system provided by the invention can overcome the gravity to enable the phase change working medium to smoothly flow back in a use scene influenced by the gravity, so that stable and reliable heat dissipation performance is provided.

Description

Technical Field

[0001] The present application relates to the technical field of temperature control devices, and more particularly to a phase change heat dissipation device and a heat dissipation system. Background Art

[0002] The phase change heat dissipation device has high heat dissipation efficiency. Its principle is that the phase change working fluid boils and vaporizes at a certain temperature at the evaporation end to absorb heat, and then the vaporized gas condenses and liquefies at the condensation end to release heat, thereby realizing heat exchange. It has good heat transfer effect and is widely used.

[0003] In the process of implementing the present application, the inventors found that there are at least the following problems in the prior art: Since the existing phase change heat dissipation device realizes the heat dissipation function after the phase change of the phase change working fluid, most of the phase change working fluids rely on capillary force or gravity for reflux. For some usage scenarios that require anti-gravity operation (such as the heat dissipation scenario of a rotating stage LED lamp), the reflux of the phase change working fluid after condensation will be affected by gravity, resulting in blocked reflux, thereby reducing the heat dissipation efficiency and even being unable to achieve the heat dissipation function, and unable to provide stable and reliable heat dissipation performance. Summary of the Invention

[0004] Based on this, the present application provides a phase change heat dissipation device and a heat dissipation system to improve the problem that the reflux of the phase change working fluid is blocked due to the influence of gravity in the prior art, and stable and reliable heat dissipation performance cannot be provided.

[0005] To achieve the above object, the technical solution of the embodiment of the present application is realized as follows:

[0006] On the one hand, the embodiment of the present application provides a phase change heat dissipation device, including an evaporation substrate and a condensation flat tube arranged perpendicular to each other; an evaporation flow channel group is provided in the evaporation substrate, and a condensation flow channel group is provided in the condensation flat tube; the evaporation flow channel group includes at least two spaced evaporation flow channel segments, and the condensation flow channel group includes at least two spaced condensation flow channel segments; the evaporation flow channel segments and the condensation flow channel segments are alternately connected in sequence to form a loop.

[0007] In one embodiment, a pulsating heat pipe flow channel is formed between the evaporation substrate and the condensation flat tube, and the flow direction of the phase change working fluid in the pulsating heat pipe flow channel is from one evaporation flow channel segment to one condensation flow channel segment to reciprocate between the evaporation substrate and the condensation flat tube.

[0008] In one embodiment, each evaporation flow channel segment and each condensation flow channel segment respectively include a straight pipe segment and an elbow connecting one end of two adjacent straight pipe segments.

[0009] In one embodiment, the length of the straight pipe section of the condensation flow channel section is greater than the length of the straight pipe section of the evaporation flow channel section.

[0010] In one embodiment, the phase change heat dissipation device further includes an evaporation cover plate, which is covered on the surface of the substrate on the side where the evaporation flow channel is provided. The evaporation cover plate is provided with through holes corresponding to the evaporation flow channels, and each through hole is used to insert one of the condensation flat tubes. The condensation flow channels of the condensation flat tubes are communicated with the evaporation flow channels through the through holes.

[0011] In one embodiment, the straight pipe section of the condensation flow channel section is perpendicular to the evaporation substrate.

[0012] In one embodiment, the cross-sectional shapes of the condensation flow channel and the evaporation flow channel include one or several of a circle, a semi-circle, a rectangle, a trapezoid or a triangle.

[0013] In one embodiment, the phase change heat dissipation device further includes heat dissipation fins, which are arranged on the condensation flat tubes.

[0014] In one embodiment, an enhanced boiling structure is provided in the evaporation flow channel, and / or an enhanced condensation structure is provided in the condensation flow channel.

[0015] On the other hand, an embodiment of the present application provides a heat dissipation system, including a fan and the phase change heat dissipation device as described above. The fan is used to blow air towards the condensation flat tubes.

[0016] The present application has at least the following beneficial effects: The phase change heat dissipation device provided by the embodiment of the present application includes an evaporation substrate and condensation flat tubes. An evaporation flow channel section is provided in the evaporation substrate, and a condensation flow channel section is provided in the condensation flat tubes. The evaporation flow channel section and the condensation flow channel section are connected to form a pulsating heat pipe flow channel. The pulsating heat pipe flow channel includes a straight pipe section and elbows. When the phase change working fluid flows in the pulsating heat pipe flow channel, the driving force for the circulation of the phase change working fluid is formed by air plugs, liquid plugs and the pressure difference between adjacent two channels. Thus, this circulation method can effectively counteract the influence of gravity on the backflow of the phase change working fluid, and can ensure a high heat transfer efficiency and provide a stable and reliable heat dissipation performance regardless of the placement angle of the phase change heat dissipation device. The heat dissipation system provided by the embodiment of the present application includes the above-mentioned phase change heat dissipation device. Therefore, it also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the phase change heat dissipation device according to the embodiment of the present application.

[0018] Figure 2 is Figure 1 exploded structure schematic diagram of the phase change heat dissipation device.

[0019] Figure 3 This is a schematic structural view of the evaporation substrate according to an embodiment of the present application.

[0020] Figure 4 This is a schematic structural view of the condensation flat tube according to an embodiment of the present application.

[0021] Figure 5 This is a schematic combined structural view of the condensation flat tube and the evaporation substrate according to an embodiment of the present application.

[0022] Figure 6 This is a schematic structural view of the connection structure between the condensation flow channel and the evaporation flow channel according to an embodiment of the present application.

[0023] The meanings of the reference numerals in the drawings are as follows:

[0024] 1. Evaporation substrate; 11. Evaporation flow channel group; 111. Evaporation flow channel section; 12. Connection flow channel; 13. Liquid injection port; 2. Evaporation cover plate; 21. Through hole; 3. Condensation flat tube; 31. Condensation flow channel group; 311. Condensation flow channel section; 4. Condensation cover plate; 5. Heat sink; 7. Top plate; 6. Side plate; 8. Straight pipe section; 9. Elbow. Detailed implementation manners

[0025] The technical solution of the present application will be further described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the implementation manner of this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application. In the description of this application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0028] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0029] The heat dissipation system of the embodiment of the present application includes a fan (not shown) and a phase change heat dissipation device. The fan is used to accelerate the air flow around the phase change heat dissipation device, thereby improving the heat exchange efficiency of the phase change heat dissipation device.

[0030] Please refer to Figures 1 to 3 , the phase change heat dissipation device of this embodiment includes an evaporation substrate 1 and a condensation flat tube 3 that are perpendicularly arranged to each other; an evaporation flow channel group 11 is provided on the surface of the evaporation substrate 1 close to the condensation flat tube 3, and a condensation flow channel group 31 is correspondingly provided on the condensation flat tube 3; the evaporation flow channel group 11 includes at least two evaporation flow channel segments 111, and the condensation flow channel group 31 includes at least two condensation flow channel segments 311; one of the evaporation flow channel segment 111 and the condensation flow channel segment 311 is at least composed of two straight pipe segments 8 and an elbow 9 connecting one ends of the two straight pipe segments 8, and the other at least includes an elbow 9; the evaporation flow channel segment 111 and the condensation flow channel segment 311 are alternately connected to form a pulsating heat pipe flow channel; the pulsating heat pipe flow channel can be filled with a phase change working medium, and the flow direction of the phase change working medium in the pulsating heat pipe flow channel is from one evaporation flow channel segment 111 to one condensation flow channel segment 311 to reciprocate between the evaporation substrate 1 and the condensation flat tube 3; the evaporation substrate 1 is used to perform heat exchange with a heat source through the phase change working medium.

[0031] When the phase change heat dissipation device is working, a certain amount of phase change working medium needs to be filled into the pulsating heat pipe flow channel. The phase change working medium includes, but is not limited to, any one or more of R134a (1,1,1,2 - tetrafluoroethane), R142b (1,1 - difluoro - 1 - chloroethane), R114 (tetrachlorodifluoroethane), R124 (monochlorotetrafluoroethane), R1233Zd(E) (trans - 1 - chloro - 3,3,3 - trifluoropropene), R1234Ze(Z) (cis - 1,3,3,3 - tetrafluoropropene), R1234Ze(E) (trans - 1,3,3,3 - tetrafluoropropene), R600a (isobutane), RC318 (octafluorocyclobutane), RE245fa (pentafluoropropane), R22 (monochlorodifluoromethane), R32 (trifluoromethane), R407C (a mixture of R32 refrigerant, R125 (pentafluoroethane) refrigerant and R134a refrigerant in a certain proportion), R410A (a mixture composed of R32 and R125).

[0032] Specifically, as Figure 2 andFigure 3 As shown, in this embodiment, a plurality of evaporation channel groups 11 are arranged side by side on one side surface of the evaporation substrate 1. Each evaporation channel group 11 includes a plurality of spaced and juxtaposed evaporation channel segments 111. An evaporation channel segment 111 may include two straight pipe segments 8 and one elbow 9. The elbow 9 connects the two straight pipe segments 8 at one end of the two straight pipe segments 8 to form a U-shaped channel; alternatively, an evaporation channel segment 111 may also include a plurality of straight pipe segments 8 or a plurality of elbows 9, and the straight pipe segments 8 and elbows are alternately connected in sequence to form a serpentine structure, with the structure including only two straight pipe segments 8 and one elbow 9 being the best. An evaporation cover plate 2 is provided on the side surface of the evaporation substrate 1 where the evaporation channel group 11 is provided, and the evaporation cover plate 2 closes the opening side of the evaporation channel group 11. The evaporation cover plate 2 is respectively provided with a through guide hole 21 corresponding to each evaporation channel group 11. The guide hole 21 extends along the arrangement direction of the evaporation channel segments 111, and each guide hole 21 is used for inserting a condensation flat tube 3. A liquid injection port 13 is also provided on the side wall of the evaporation substrate 1, and the liquid injection port 13 is communicated with the evaporation channel group 11 for injecting a phase change working fluid into the evaporation channel group 11.

[0033] As Figure 4 and Figure 5 As shown, each condensation flat tube 3 is respectively provided with a condensation channel group 31. The condensation channel group 31 includes a plurality of spaced and juxtaposed condensation channel segments 311. A condensation cover plate 4 is provided on the surface of the condensation flat tube 3 where the condensation channel segments 311 are provided. The condensation channel segment 311 in this embodiment may include only two straight pipe segments 8 and one elbow 9. The elbow 9 connects the two straight pipe segments 8 at one end of the two straight pipe segments 8 to form a U-shaped channel. Alternatively, the condensation channel segment 311 may include only a plurality of straight pipe segments 8 and a plurality of elbows 9, and the straight pipe segments 8 and elbows 9 are alternately connected in sequence to form a serpentine structure, with the structure of the condensation channel segment 311 including only two straight pipe segments 8 and one elbow 9 being the best. The straight pipe segments 8 of the condensation flat tube 3 are perpendicular to the evaporation substrate 1. For example, if the evaporation substrate 1 is arranged horizontally, the condensation flat tube 3 is arranged vertically, and the straight pipe segments 8 of the condensation flat tube 3 are also arranged vertically. The length of the straight pipe segments 8 of the condensation flat tube 3 in this embodiment is greater than the length of the straight pipe segments 8 of the evaporation substrate 1. That is, in this embodiment, the two adjacent straight pipe segments 8 of the condensation flat tube 3 are used as the main conveying channels, mainly for forming a pressure difference, and the elbow 9 of the evaporation substrate 1 is used to increase the pressure difference, so that the phase change working fluid is easy to form a reflux power.

[0034] As Figure 6As shown in the figure, in this embodiment, the evaporation channel section 111 and the condensation channel section 311 are correspondingly arranged. The evaporation channel section 111 and the condensation channel section 311 are sequentially and alternately connected end to end to form a pulsating heat pipe channel, so that the phase change working fluid passes through an evaporation channel section 111 in sequence and then passes through a condensation channel section 311 during circulation, making the phase change working fluid closer to the heat source, making the pulsating heat pipe channel structure easier to start, and thus improving the heat exchange performance of the phase change heat dissipation device.

[0035] In this embodiment, the number of the condensation flat tubes 3 is 3, and the number of the evaporation channel groups 11 is also 3. In order to facilitate the connection of the outermost condensation channel group 31 and an evaporation channel group 11 (so that the interfaces of the head and tail channels are on the same side for easy connection), a connection channel 12 can be arranged on the upper surface of the evaporation substrate 1 for connecting the condensation flat tube 3 and the next adjacent evaporation channel group 11, so that the inlet and outlet directions of the adjacent two groups of condensation flat tubes 3 and evaporation channel groups 11 are the same. The structural form of the connection channel 12 is not limited as long as the connection can be achieved. For example, a serpentine structure can be adopted as in this embodiment, that is, a structure including a straight tube section 8 and an elbow 9. This structure can further improve the anti-gravity performance of the phase change heat dissipation device and is conducive to the reflux of the phase change working fluid. In other embodiments, the number of the condensation flat tubes 3 and the evaporation channel groups 11 is specifically designed according to actual needs, and the specific number is not limited. When the numbers of both the condensation flat tubes 3 and the evaporation channel groups 11 are even numbers, the head and tail can be directly connected in a serpentine manner, and at this time, the head and tail interfaces of the channels are on the same side, and there is no need to set up a connection channel 12.

[0036] In other embodiments, when the evaporation channel section 111 includes a straight tube section 8, the condensation channel section 311 can also only include an elbow 9 for connection and increasing the pressure difference. Similarly, when the condensation channel section 311 includes a straight tube section 8, the evaporation channel section 111 can also only include an elbow 9 for connection and increasing the pressure difference. The anti-gravity effect is the best when the evaporation channel section 111 and the condensation channel section 311 respectively include a straight tube section 8 and an elbow 9.

[0037] The cross-sectional shapes of the condensation channel section 311 and the evaporation channel section 111 include one or several of a circle, a semi-circle, a rectangle, a trapezoid or a triangle. The performance of the pulsating heat pipe channel with a trapezoidal or triangular cross-section is the best.

[0038] The phase change heat dissipation device further includes a top plate 7 and two side plates 6. One end of the condensation flat tube 3 is inserted into the guide through hole 21, and the other end is fixedly connected to the top plate 7. The two side plates 6 are respectively arranged outside the two outermost condensation flat tubes 3 and are arranged parallel to the condensation flat tubes 3. One end of the two side plates 6 is fixedly connected to the evaporation cover plate 2, and the other end is fixedly connected to the top plate 7.

[0039] To increase the heat dissipation capacity of the flat condensation tube 3, heat sinks 5 can also be provided on the flat condensation tube 3 to increase the heat dissipation area of the flat condensation tube 3. Specifically, the heat sinks 5 can be one or more of straight fins, fenestrated fins, folded fins, and corrugated fins.

[0040] To enhance the evaporation efficiency of the evaporation channel section 111, a boiling enhancement structure (not shown) can be provided in the evaporation channel section 111. Similarly, to enhance the condensation efficiency of the condensation channel section 311, a condensation enhancement structure (not shown) can be provided in the condensation channel section 311. The boiling enhancement structure and the condensation enhancement structure can be, for example, micro-groove structures formed on the channel surface by sandblasting, laser engraving, laser etching, chemical etching, or machining, or capillary structures for enhancing boiling or improving liquid absorption capacity, such as capillary structures with welded metal meshes, welded metal foam capillary structures, or porous structures such as metal powder sintered structures.

[0041] In the embodiment of the present application, a condensation channel group 31 is provided on the flat condensation tube 3, and an evaporation channel group 11 is provided on the evaporation substrate 1. The evaporation channel group 11 and the condensation channel group 31 are connected through the through holes 21 on the evaporation cover plate 2. The evaporation channel section 111 and the condensation channel section 311 are connected end to end to form a three-dimensional pulsating heat pipe circulation channel.

[0042] During operation, after the phase change working fluid is injected into the evaporation channel group 11, the phase change working fluid will be distributed in the pulsating heat pipe channel. Under the action of surface tension, the phase change working fluid is in a state of randomly spaced air plugs and liquid plugs.

[0043] The phase change heat dissipation device of the embodiment of the present application can be installed and operated at any angle. When the heat of the heat source is transferred to the evaporation channel group 11 through the back surface of the evaporation substrate 1, the liquid phase change working fluid in the channel is heated and evaporated to generate bubbles, which rapidly expand and increase pressure, and push the liquid plug towards the condensation channel group 31. After the gaseous phase change working fluid reaches the condensation channel group 31, it condenses on the inner wall surface of the flat condensation tube 3 and releases heat. Due to the pressure difference between the channels, the air plug contracts and the pressure drops, and the liquid plug formed after the gaseous phase change working fluid condenses returns to the evaporation channel group 11. In this way, a reciprocating oscillating motion of the phase change working fluid and a heat transfer process are formed. The flat condensation tube 3 can exchange heat with the outside air through the heat sinks 5 on the outer wall surface, and transfer the heat to the air, thereby enhancing the heat exchange effect.

[0044] For a traditional phase change heat dissipation device, when the evaporation substrate 1 is in a substantially vertical state, when the heat source is located at a lower position on the back of the evaporation substrate 1, the phase change working fluid at the evaporation end can participate in the cycle. However, when the heat source is located at the middle position on the back of the evaporation substrate 1, affected by gravity, the phase change working fluid (liquid state) will deposit at the bottom of the evaporation end, and the phase change working fluid at the bottom cannot participate in the cycle. The flow channel structure of the pulsating heat pipe adopted in this application relies on gas plugs, liquid plugs, and the pressure difference between adjacent pipes to drive the circulation of the phase change working fluid, and its driving method can overcome the influence of gravity. Therefore, it can flow against gravity, enabling the condensed liquid phase change working fluid to flow back to the evaporation flow channel group 11.

[0045] The phase change heat dissipation device of the embodiment of the present application is provided with a flow channel cavity in the condensation flat tube 3, which can not only improve the heat exchange efficiency of the phase change heat dissipation device, but also reduce the weight of the phase change heat dissipation device itself.

[0046] The phase change heat dissipation device of the embodiment of the present application utilizes the pulsating heat pipe flow channel structure. When the heat source heats the phase change heat dissipation device, the flow path of the phase change working fluid is in a cyclic form of flat tube - substrate - flat tube - substrate... The phase change working fluid does not need to flow from the starting end of the condensation flow channel group 31 to the end and then reach the evaporation flow channel group 11. The phase change working fluid enters the condensation flat tube 3 from the evaporation substrate 1 for heat and cold alternating cyclic flow, shortening the heat transfer path of the phase change working fluid at the hot end. The phase change working fluid can contact the heat source at a closer distance. At the same time, it makes the pulsating heat pipe flow channel easier to start, thereby improving the heat dissipation performance.

[0047] The phase change heat dissipation device of the embodiment of the present application utilizes the anti-gravity ability of the pulsating heat pipe flow channel. The circulating driving force of the phase change working fluid is formed by relying on gas and liquid plugs and the pressure difference between adjacent channels. This driving method can overcome the influence of gravity and enable the phase change working fluid to flow against gravity.

[0048] For the phase change heat dissipation device of the embodiment of the present application, the heat source can be arranged at any position on the back of the evaporation substrate 1. The phase change working fluid will not be deposited at the bottom of the evaporation substrate 1 due to the influence of gravity. The liquid phase change working fluid at the bottom of the evaporation flow channel group 11 can participate in the phase change cycle, making full use of the condensation heat exchange area, thereby improving the heat exchange performance of the phase change heat dissipation device.

[0049] The flow channel of the phase change heat dissipation device of the embodiment of the present application is a pulsating heat pipe flow channel structure. The setting of elbows 9 is added to the flow channel. The flow channel form of multiple elbows 9 can increase the pressure difference between adjacent pipes, making the pulsating heat pipe flow channel easier to start, thereby improving the heat dissipation performance.

[0050] The flow channel of the phase change heat dissipation device according to the embodiment of the present application is formed by a plurality of pulsating heat pipe flow channel structures. Using this structure, the phase change working fluid enters the condensation flow channel of the condensation flat tube from the evaporation substrate and performs a cold and hot alternating cyclic flow (the phase change working fluid alternately enters the evaporation substrate and the condensation flat tube and reciprocates between the evaporation substrate and the condensation flat tube), shortening the heat transfer path of the phase change working fluid at the hot end. The phase change working fluid can contact the heat source at a closer distance, and the pulsating heat pipe flow channel is easier to start, thereby improving the heat exchange performance of the heat dissipation device.

[0051] The phase change heat dissipation device based on the pulsating heat pipe flow channel structure uses the reciprocating motion of gas and liquid plugs in the cyclic flow channel formed by connecting the condensation flat tube and the evaporation substrate to achieve efficient heat transfer. During the entire heat transfer process, it is mainly self-oscillation driven by heat, solving the problems of the backflow of the phase change working fluid in the reverse gravity working scenario and the inability to fully utilize the condensation area, enabling the heat dissipation device to have higher heat exchange efficiency and solving the heat dissipation problem of high-power heat sources.

[0052] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0053] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A phase change heat dissipation device, characterized in that, It includes an evaporation substrate and a condensation flat tube which are arranged perpendicular to each other; an evaporation flow channel group is formed in the evaporation substrate, and a condensation flow channel group is formed in the condensation flat tube; the evaporation flow channel group includes at least two spaced evaporation flow channel segments, and the condensation flow channel group includes at least two spaced condensation flow channel segments; the evaporation flow channel segments and the condensation flow channel segments are alternately connected in sequence to form a loop.

2. The phase change heat dissipation device according to claim 1, wherein A pulsating heat pipe flow channel is formed between the evaporation substrate and the condensation flat tube, and the flow direction of the phase change working fluid in the pulsating heat pipe flow channel is from one evaporation flow channel segment to one condensation flow channel segment, so as to reciprocate between the evaporation substrate and the condensation flat tube.

3. The phase change heat dissipation device according to claim 1, characterized in that, Each evaporation flow channel segment and each condensation flow channel segment respectively include a straight pipe segment and an elbow connecting one ends of two adjacent straight pipe segments.

4. The phase change heat dissipation device according to claim 3, characterized in that, The length of the straight pipe segment of the condensation flow channel segment is greater than the length of the straight pipe segment of the evaporation flow channel segment.

5. The phase change heat dissipation device according to claim 3, characterized in that, It further includes an evaporation cover plate, the evaporation cover plate is covered on the surface of the substrate on the side where the evaporation flow channel is provided, guide through holes corresponding to the evaporation flow channels are provided on the evaporation cover plate, and each guide through hole is used for inserting one condensation flat tube, and the condensation flow channel of the condensation flat tube is communicated with the evaporation flow channel through the guide through hole.

6. The phase change heat dissipation device according to claim 3, wherein The straight pipe segment of the condensation flow channel segment is arranged perpendicular to the evaporation substrate.

7. The phase change heat dissipation device according to claim 1, wherein, The cross-sectional shapes of the condensation flow channel and the evaporation flow channel include one or several of circular, semi-circular, rectangular, trapezoidal or triangular.

8. The phase change heat dissipation device according to claim 1, wherein It further includes a heat sink, and the heat sink is arranged on the condensation flat tube.

9. The phase change heat dissipation device according to claim 1, wherein An enhanced boiling structure is provided in the evaporation flow channel, and / or an enhanced condensation structure is provided in the condensation flow channel.

10. A heat dissipation system, characterized in that, It includes a fan and the phase change heat dissipation device according to any one of claims 1 to 9, and the fan is used to blow air to the condensation flat tube.

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