Radiator and radiating system

Abstract

The invention provides a radiator and a radiating system. The radiator comprises a substrate and a flat tube arranged on the substrate. A first flow channel is formed in the base plate, and a second flow channel is formed in each flat pipe; the first flow channel and the second flow channel are connected to form a loop, so that a pulsating heat pipe flow channel is formed between the substrate and the flat pipe; the surface of the side, away from the flat pipe, of the base plate is used for making contact with a heat source and conducting heat exchange with the heat source through a phase change medium filled in a pulsating heat pipe runner. The radiator and the radiating system provided by the invention can resist the influence of gravity, provide stable and reliable radiating performance, and have the advantages of high radiating efficiency and good radiating effect.

Description

Technical Field

[0001] The present application relates to the technical field of temperature control devices, and in particular, to a radiator and a heat dissipation system. Background Art

[0002] With the development of technology, the requirements for the performance of electronic and electrical equipment are getting higher and higher. With the improvement of performance, the heat flux density of electronic and electrical components will inevitably increase significantly. Therefore, how to quickly conduct the heat generated by electronic and electrical components to achieve the purpose of heat dissipation is an urgent problem to be solved at present.

[0003] At present, there is a phase change radiator that can well solve the above heat dissipation problem. The phase change radiator in the prior art includes a module composed of a heat pipe, a heat pipe, a fin, and a heat pipe radiator. It uses a sufficient heat dissipation area for heat dissipation, and has advantages such as good reliability, easy processing, and low cost.

[0004] 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 radiator realizes the heat dissipation function after the phase change medium undergoes a phase change, most of the phase change media rely on capillary force or gravity to flow back. In some heat dissipation scenarios that require anti-gravity operation (such as the heat dissipation scenario of a rotating stage LED lamp), the condensation and backflow of the phase change medium will be affected by gravity, resulting in blocked backflow, thereby reducing the heat dissipation efficiency and making it difficult to meet the heat dissipation requirements. Summary of the Invention

[0005] Based on this, the present application provides a radiator and a heat dissipation system to improve the problem of low heat dissipation efficiency when the radiator operates against gravity.

[0006] To achieve the above object, the technical solution of the embodiment of the present application is realized as follows:

[0007] On the one hand, the embodiment of the present application provides a radiator, including a substrate and flat tubes arranged on the substrate; a first flow channel is opened in the substrate, and a second flow channel is respectively opened in each flat tube; the first flow channel and the second flow channel are connected into a loop to form a pulsating heat pipe flow channel between the substrate and the flat tubes; the surface of the substrate away from the flat tubes is used to contact a heat source, and heat exchange is performed with the heat source through a phase change medium filled in the pulsating heat pipe flow channel.

[0008] In one embodiment, the plane where the first flow channel is located and the plane where the second flow channel is located are perpendicularly arranged.

[0009] In one embodiment, the second flow channel is a serpentine capillary structure, including a plurality of straight pipe segments and elbows connected between adjacent two straight pipe segments, and the straight pipe segments are arranged along the vertical direction of the plane where the first flow channel is located.

[0010] In one embodiment, at least one of the first flow channels is provided in each of the substrates. The first flow channel is a serpentine capillary structure. Each of the first flow channels is respectively provided with a flat tube, and a second flow channel is respectively provided in each of the flat tubes.

[0011] In one embodiment, the flow direction of the phase change medium in the pulsating heat pipe flow channel is from the first flow channel to the corresponding second flow channel.

[0012] In one embodiment, the surface of the substrate provided with the first flow channel is covered with a support cover plate. The support cover plate is provided with communication holes, and the positions of the communication holes are correspondingly arranged with the first flow channels. A flat tube insert is respectively inserted into each of the communication holes, so that the second flow channel is connected to the corresponding first flow channel.

[0013] In one embodiment, the first flow channel and the second flow channel are alternately connected end to end in sequence to form the pulsating heat pipe flow channel.

[0014] In one embodiment, the radiator further includes a fin group, and the fin group is provided on the flat tube.

[0015] In one embodiment, each of the fin groups respectively includes a plurality of fins, and the fins include one or several of straight fins, windowed fins, folded fins and corrugated fins.

[0016] In one embodiment, the phase change medium includes one or several of R134a, R22, R1233zd or fluorinated liquid.

[0017] In one embodiment, the cross-sectional shapes of the first flow channel and the second flow channel include one or several of circular, semi-circular, rectangular, trapezoidal or triangular.

[0018] In one embodiment, an enhanced boiling structure is provided in the first flow channel, and / or an enhanced condensation structure is provided in the second flow channel.

[0019] On the other hand, an embodiment of the present application provides a heat dissipation system, which includes a fan and the radiator as described above. The fan is used to accelerate the gas flow velocity around the flat tube.

[0020] The present application has at least the following beneficial effects: The radiator provided by the embodiments of the present application includes a base plate and flat tubes. A first flow channel and a second flow channel are respectively formed in the base plate and the flat tubes. After the first flow channel and the second flow channel are connected, a pulsating heat pipe flow channel is formed. The pulsating heat pipe flow channel has good anti-gravity ability. When the radiator operates, the driving force for the phase change medium to circulate is formed by air plugs, liquid plugs, and the pressure difference between adjacent channels. Therefore, this circulation method can effectively counteract the influence of gravity on the backflow of the phase change medium, effectively improve the heat exchange efficiency when the radiator operates under anti-gravity conditions, provide a stable and reliable heat dissipation function, and at the same time, can meet the heat dissipation requirements in any scenario, enabling the radiator to be installed and operated in any direction. The heat dissipation system provided by the present application includes the above-mentioned radiator, so it also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic diagram of the overall structure of the radiator according to the embodiment of the present application.

[0022] Figure 2 FIG. is a schematic exploded view of the radiator according to the embodiment of the present application.

[0023] Figure 3 FIG. is a schematic diagram of the combined structure of the flat tube and the base plate according to the embodiment of the present application.

[0024] Figure 4 FIG. is a schematic diagram of the connection structure of the first flow channel and the second flow channel according to the embodiment of the present application.

[0025] Figure 5 FIG. is a schematic diagram of the structure of the base plate according to the embodiment of the present application.

[0026] Figure 6 FIG. is a schematic diagram of the combined structure of the base plate, the support cover plate and one flat tube according to the embodiment of the present application.

[0027] The meanings of the reference numerals in the drawings are as follows:

[0028] 1. Base plate; 11. Mounting hole; 12. Liquid injection port; 13. First flow channel; 131. First end; 132. Second end; 2. Flat tube; 21. Second flow channel; 211. Third end; 212. Fourth end; 22. First flat tube; 23. Second flat tube; 24. Third flat tube; 3. Fin group; 31. Fin; 4. Side plate; 5. Upper cover plate; 6. Support cover plate; 61. Communication hole; 7. Straight pipe section; 8. Elbow; 9. Side cover plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The technical solutions of the present application will be further described in detail below in conjunction with the drawings in the specification and specific embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are for the purpose of describing specific embodiments only and are not intended to limit the implementation of this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] 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 "plurality" is two or more.

[0032] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The heat dissipation system of the embodiment of this application is used to dissipate heat and cool down a heat source, and includes a fan (not shown) and a radiator. The fan is used to accelerate the cooling of the condensation end of the radiator.

[0034] Please refer to Figures 1 to 3 , the radiator of this embodiment is a phase change air-cooled radiator, and includes a base plate 1, flat tubes 2 and a fin group 3. A first flow channel 13 is opened in the base plate 1, and a second flow channel 21 is opened in the flat tube 2. The plane where the first flow channel 13 is located and the plane where the second flow channel 21 is located are vertically arranged; the first flow channel 13 and / or the second flow channel 21 is a serpentine capillary structure, and includes a plurality of straight pipe segments 7 and elbows 8 connecting the straight pipe segments 7; the first flow channel 13 and the second flow channel 21 are connected end to end to form a pulsating heat pipe flow channel, and the pulsating heat pipe flow channel is used to fill a phase change medium; the surface of the base plate 1 away from the flat tube 2 is used to contact the heat source and perform heat exchange with the heat source through the phase change medium.

[0035] When the radiator works, it is necessary to evacuate the pulsating heat pipe flow channel to a negative pressure, and then fill an appropriate amount of phase change medium into the pulsating heat pipe flow channel. The phase change medium includes, but is not limited to, one or more of R134a (1,1,1,2-tetrafluoroethane), R22 (chlorodifluoromethane), R1233zd (1-chloro-3,3,3-trifluoropropene), or a fluorinated liquid.

[0036] In this embodiment, the first flow channel 13 of the substrate 1 serves as the evaporation end, and the second flow channel 21 of the flat tube 2 serves as the condensation end. The heat source is installed on the surface of the substrate 1 on the side away from the flat tube 2, and it can be installed at any position on the substrate 1. At the same time, the installation direction of the substrate 1 is not limited to the horizontal installation direction, and the required installation direction can be arbitrarily selected according to actual needs. For example, the substrate 1 can be placed and installed in the vertical direction.

[0037] Specifically, as Figure 4 and Figure 5 shown, in this embodiment, a plurality of first flow channels 13 are formed on the upper surface of the substrate 1. The first flow channel 13 includes a first end 131 and a second end 132. Each first flow channel 13 is a serpentine capillary structure, including a number of straight pipe segments 7 and elbows 8 connected between adjacent straight pipe segments 7. The more the number of elbows 8, the more conducive to forming and increasing the pressure difference between two adjacent straight pipes, more conducive to the reflux of the phase change medium, and at the same time making the circulation speed of the phase change medium faster. The straight pipe segments 7 in this embodiment are arranged in a direction perpendicular to the plane where the first flow channel 13 is located.

[0038] To enhance the boiling heat transfer effect of the first flow channel 13 and improve the heat dissipation uniformity of the surface of the evaporation cavity formed by the first flow channel 13, a boiling enhancement structure (not shown) can also be provided on the inner surface of the first flow channel 13. The boiling enhancement structure can be, for example, a micro-groove structure formed on the surface of the first flow channel 13 by means of sandblasting, laser engraving, laser etching, chemical etching, or mechanical processing, or a capillary structure for enhancing the boiling effect, such as a capillary structure with a welded metal wire mesh, a welded metal foam capillary structure, or a porous structure such as a metal powder sintered structure.

[0039] As Figure 2 and Figure 6As shown, a support cover plate 6 is provided on the upper surface of the substrate 1, and the lower surface of the support cover plate 6 closes the upper end of the first flow channel 13. At the same time, a plurality of through strip-shaped communication holes 61 are provided on the support cover plate 6. The communication holes 61 are arranged corresponding to the first flow channels 13. Each first flow channel 13 is respectively provided with a communication hole 61. Each communication hole 61 is respectively arranged in the vertical direction of the straight pipe section 7 of the corresponding first flow channel 13, and a flat pipe 2 is inserted in each communication hole 61 in the vertical direction of the substrate 1. Each flat pipe 2 is arranged corresponding to the first flow channel 13 corresponding to the communication hole 61 below it. Mounting holes 11 are respectively opened at the corners of the substrate 1. Bolts and other connecting pieces are installed in the mounting holes 11 to fix the radiator. A liquid injection port 12 communicating with the first flow channel 13 is further provided on one side wall of the substrate 1. A sealing plug (not shown) is provided on the liquid injection port 12. The liquid injection port 12 is used to inject a phase change medium into the pulsating heat pipe flow channel.

[0040] As Figure 1 and Figure 2 shown, the radiator of this embodiment further includes an upper cover plate 5 and side plates 4. The upper cover plate 5 is arranged at the top of the radiator. The lower end of the flat pipe 2 is inserted into the communication hole 61, and the upper end is fixedly connected to the upper cover plate 5. The side plates 4 are arranged parallel to the flat pipes 2 and are respectively arranged outside the two outermost flat pipes 2. The upper and lower ends of the side plates 4 are respectively fixedly connected to the upper cover plate 5 and the support cover plate 6.

[0041] As Figure 4 and Figure 6 shown, a second flow channel 21 is respectively opened on one side surface of each flat pipe 2. The second flow channel 21 is closed by covering a side cover plate 9 on this side. The second flow channel 21 is a serpentine capillary structure, including a plurality of straight pipe sections 7 and elbows 8 connecting two adjacent straight pipe sections 7. The elbows 8 are beneficial to form and increase the pressure difference between two adjacent straight pipes, which is more beneficial to the reflux of the phase change medium and at the same time makes the circulation speed of the phase change medium faster. There is a certain critical value for the number of elbows in the pulsating heat pipe flow channel. Under certain conditions, it can be successfully started and operated horizontally or even against gravity. Each second flow channel 21 includes a third end 211 and a fourth end 212. For example, as Figure 3As shown, in this embodiment, there are a total of three flat tubes 2 and three first flow channels 13. The sequentially arranged flat tubes 2 are respectively defined as a first flat tube 22, a second flat tube 23, and a third flat tube 24. The third end 211 of the second flow channel 21 in the first flat tube 22 is communicated with the first end 131 of the corresponding first flow channel 13, and the fourth end 212 of the second flow channel 21 in the first flat tube 22 is communicated with the second end 132 of the next adjacent first flow channel 13; the third end 211 of the second flow channel 21 in the second flat tube 23 is communicated with the first end 131 of the corresponding first flow channel 13, and the fourth end 212 of the second flow channel 21 in the second flat tube 23 is communicated with the second end 132 of the next adjacent first flow channel 13; the third end 211 of the second flow channel 21 in the third flat tube 24 is communicated with the first end 131 of the corresponding first flow channel 13, and the fourth end 212 of the second flow channel 21 in the third flat tube 24 is communicated with the second end 132 of the next first flow channel 13 (i.e., the first flow channel 13 corresponding to the first flat tube 22), forming a pulsating heat pipe flow channel in which the first flow channel 13 and the second flow channel 21 are alternately connected end to end in sequence. The connection mode of the first flow channel 13 and the second flow channel 21 in this embodiment is only a specific implementation manner. In other embodiments, the specific connection mode is not limited, as long as the first flow channel 13 and the second flow channel 21 can be alternately connected end to end in sequence. That is, when the phase change medium circulates, after passing through a first flow channel 13, it will then pass through a second flow channel 21, and then, pass through a first flow channel 13 again, and then pass through a second flow channel 21... Figure 3 In [the figure], the second flow channel 21 in the second flat tube 23 is located on the other side in the figure (the other side opposite to the side where the first flat tube 21 and the third flat tube 24 are provided with the second flow channel 21), which is not shown in the figure.

[0042] Both the first flow channel 13 and the second flow channel 21 in this embodiment are serpentine capillary tube structures, and both include straight tube segments 7 and elbows 8, which can effectively increase the pressure difference between two adjacent straight tube segments 7 and are beneficial to the reflux of the phase change medium. However, in some other embodiments, a serpentine capillary tube structure including an elbow 8 structure may also be provided only in the first flow channel 13 or only in the second flow channel 21, and only straight tube segments 7 are provided in the other flow channel, and a pulsating heat pipe flow channel can also be formed. The embodiment in which both the first flow channel 13 and the second flow channel 21 are provided with serpentine capillary tube structures (including elbows 8) has the best effect.

[0043] Similarly, a condensation enhancement structure similar to the boiling enhancement structure (not shown) can also be provided on the surface of the second flow channel 21. The condensation enhancement structure can adopt the same structure as the boiling enhancement structure to enhance the condensation effect of the phase change medium. The specific structure will not be elaborated here.

[0044] The fin group 3 is arranged on the outer surface of the flat tube 2, which is used to increase the heat dissipation area of the flat tube 2 and improve the heat dissipation efficiency. Each fin group 3 includes a plurality of fins 31, and the fins 31 include, but are not limited to, one or several of straight fins 31, window fins 31, folded fins 31 and corrugated fins 31.

[0045] The cross-sectional shapes of the first flow channel 13 and the second flow channel 21 include, but are not limited to, one or several of circular, semi-circular, rectangular, trapezoidal or triangular shapes.

[0046] In the flat tube 2 of this embodiment, a second flow channel 21 is processed, and the phase change medium can flow in the second flow channel 21. A first flow channel 13 is provided on the substrate 1. Through the communication hole 61 on the support cover plate 6, the flow channels of the flat tube 2 and the substrate 1 are communicated, so that the phase change medium can flow from the first flow channel 13 on the substrate 1 through the communication hole 61 of the support cover plate 6 into the second flow channel 21 of the flat tube 2. Moreover, the first flow channel 13 and the second flow channel 21 are alternately connected end to end in sequence to form a three-dimensional pulsating heat pipe flow channel.

[0047] During operation, the phase change medium is injected into the substrate 1, and the phase change medium will be distributed in the pulsating heat pipe flow channel. Under the action of surface tension, the phase change medium in the flow channel is in a state of randomly spaced air plugs and liquid plugs.

[0048] The heat source can be located at any position on the back surface (the surface away from the flat tube 2) of the substrate 1 of the radiator. When the heat of the heat source is transferred to the evaporation cavity formed by the first flow channel 13 through the back surface of the substrate 1, the liquid medium in the cavity is heated to generate bubbles, which expand and boost the pressure rapidly, and push the liquid plug towards the condensation section (the second flow channel 21). After the gaseous phase change medium reaches the condensation section, it condenses on the inner wall surface of the flat tube 2 and releases heat. Due to the pressure difference between the evaporation section and the condensation section and the adjacent pipes (the straight pipe section 7), the air plug shrinks and the pressure drops, and the liquid plug formed after the gaseous phase change medium condenses returns to the evaporation section and the bottom of the substrate 1 of the radiator. In this way, a reciprocating oscillating motion of the phase change medium and a heat transfer process are formed. The heat on the outer wall surface of the flat tube 2 can be convectively exchanged with the air through the fin group 3 to transfer the heat to the air, thereby enhancing the heat transfer effect.

[0049] For a traditional radiator, when the substrate 1 is in a substantially vertical state, when the heat source is located at a lower position on the back of the substrate 1, the phase change medium at the bottom of the evaporation chamber can participate in the circulation. However, when the heat source is located at the middle position on the back of the substrate 1, affected by gravity, the phase change medium (liquid state) will deposit at the bottom of the evaporation chamber, and the phase change medium in the lower part cannot participate in the circulation. At the same time, when the radiator is rotated to any angle for use, the condensed phase change medium of the traditional radiator cannot flow back due to the influence of gravity. However, the pulsating heat pipe flow channel adopted in the present application relies on the air plug, liquid plug and the pressure difference between adjacent pipes to promote the circulation of the phase change medium, and its promotion method can overcome the influence of gravity. Therefore, it can flow against gravity, enabling the condensed liquid phase change medium to flow back to the bottom of the evaporation chamber.

[0050] The phase change air-cooled radiator utilizes a certain anti-gravity ability of the pulsating heat pipe flow channel. When the radiator works under anti-gravity conditions, the phase change medium in the pulsating heat pipe flow channel can circulate. And each flat tube 2 communicates with the corresponding first flow channel 13 on the substrate 1 to form a pulsating heat pipe flow channel, and the flow channels of the entire radiator are formed by a pulsating heat flow channel. Using this structure, when heating the radiator, the flow path of the phase change medium is in a cyclic form of substrate 1 - flat tube 2 - substrate 1 - flat tube 2... The flow channel structures of multiple elbows 8 can increase the pressure difference between adjacent pipes, making the pulsating heat pipe flow channel easier to start, thereby improving the heat dissipation performance of the radiator.

[0051] The effective operation of the pulsating heat pipe flow channel is mainly achieved by the reciprocating oscillation of the air plug and liquid plug in the flow channel. The size of the inner diameter of the flow channel will have a huge impact on the initial distribution of the air plug and liquid plug and the flow of the phase change medium. When the inner diameter size of the flow channel is small enough, the surface tension of the phase change medium in the flow channel can overcome its own gravity to form a random distribution state of the air plug and liquid plug. If the inner diameter size of the flow channel is too small, the resistance of the phase change medium will increase sharply with the decrease of the inner diameter of the flow channel. Excessive resistance will cause it to be unable to generate oscillation, resulting in a decrease in the heat transfer capacity of the radiator.

[0052] The relationship between surface tension and gravity can be expressed by the dimensionless numbers Bo or Eo:

[0053]

[0054] When Bo ≤ 2, a stable alternating distribution state of air plugs and liquid plugs can be formed in the flow channel. From this, the calculation formula for the critical pipe diameter D of the pulsating heat pipe flow channel is as follows:

[0055]

[0056] Among them, σ is the surface tension; ρ l is the liquid density; ρ g is the vapor density; g is the acceleration due to gravity.

[0057] The size of the inner diameter of the flow channel is also related to the type of phase change medium to be filled. Since the density of the phase change medium is different at different temperatures, the inner diameter of the flow channel needs to be calculated according to the parameters of the specific phase change medium to select the optimal value.

[0058] Assuming that R1233zd is selected as the refrigerant, the calculated range of the inner diameter of the flow channel is 0.7 - 1.9 mm according to the above formula. At this time, when the inner diameter range of the flow channel is 1 - 1.5 mm, it is the best design in terms of both processing and startup performance.

[0059] There is a critical value for the number of elbows 8 in the pulsating heat pipe flow channel. Under certain conditions, it can be successfully started and operated horizontally or even against gravity. The critical value of the elbow 8 is related to parameters such as the pipe diameter, pipe length, operating conditions, and physical properties of the phase change medium of the pulsating heat pipe flow channel. The performance of the pulsating heat pipe flow channel with a triangular cross-section is better than that of the pulsating heat pipe flow channel with a square cross-section, and the performance of the pulsating heat pipe flow channel with an isosceles right triangle cross-section is better than that of the pulsating heat pipe flow channel with an equilateral triangle cross-section. The cross-sectional shape has a great influence on the transformation and distribution of the flow pattern of the phase change medium in the pulsating heat pipe flow channel. Especially when the cross-sectional shape is not circular, the influence of the sharp corner area on the flow pattern is very obvious. Under the capillary action in the sharp corner area, the phase change medium will form a liquid film in the sharp corner area, effectively preventing the burnout phenomenon caused by the inability of the liquid slug to return in time in the pulsating heat pipe flow channel. Therefore, the pulsating heat pipe flow channel with a trapezoidal or triangular cross-section has better performance.

[0060] In the radiator according to the embodiment of the present application, a cavity (second flow channel 21) is provided in the flat tube 2, which can not only improve the heat exchange efficiency but also reduce the weight of the radiator itself.

[0061] The radiator according to 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 medium is formed by the gas slug, liquid slug, and the pressure difference between adjacent channels. This driving method can overcome the influence of gravity, so the phase change medium can flow against gravity. When the radiator works under anti-gravity conditions, the phase change medium evaporates when heated to generate steam, and the steam condenses in the flat tube 2, and the condensed liquid can flow back to the substrate 1.

[0062] In the radiator according to the embodiment of the present application, its heat source can be installed at any position on the back of the substrate 1, and the phase change medium will not be deposited below the evaporation chamber due to the influence of gravity. The liquid phase change medium below the evaporation chamber can participate in the phase change cycle and circulate through the pulsating heat pipe flow channel, making full use of the condensation heat exchange area, thereby improving the heat exchange performance of the radiator.

[0063] The flow channel of the heat sink according to the embodiment of the present application is a pulsating heat pipe flow channel structure. An elbow 8 structure is added to the substrate 1. The flow channel forms of multiple elbows 8 can increase the pressure difference between adjacent pipes, and the pulsating heat pipe flow channel is easier to start, thereby improving the heat dissipation performance of the heat sink.

[0064] The heat sink according to the embodiment of the present application is a phase change air-cooled heat sink based on a pulsating heat pipe flow channel. It utilizes the reciprocating motion of gas plugs and liquid plugs in the pulsating heat pipe flow channel formed by connecting the second flow channel 21 of the flat tube 2 and the first flow channel 13 of the substrate 1 by a phase change medium 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 medium in the reverse gravity working scenario and the inability to fully utilize the condensation area, enabling the heat sink to have higher heat exchange efficiency and solving the heat dissipation problem of high-power heat sources.

[0065] The flat tube 2 and the substrate 1 of the heat sink according to the embodiment of the present application are respectively provided with flow channels. A support cover plate 6 is provided between the substrate 1 and the flat tube 2. The flow channels on the flat tube 2 and the substrate 1 are connected through the communication holes 61 on the support cover plate 6, enabling the phase change medium to flow from the first flow channel 13 on the substrate 1 into the second flow channel 21 of the flat tube 2 through the communication holes 61 of the support cover plate 6, thereby forming a three-dimensional pulsating heat pipe flow channel structure and realizing reverse gravity operation.

[0066] The heat sink and the heat dissipation system according to the embodiment of the present application have a simple structure and low manufacturing cost, and can effectively improve the heat dissipation efficiency and heat dissipation effect of the heat sink, thereby providing a stable and reliable heat dissipation function for the device.

[0067] It should be noted that in this article, the terms "including", "comprising" 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 expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitations, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0068] 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 should be subject to the protection scope of the claims.

Claims

1. A radiator, characterized in that, It includes a substrate and flat tubes disposed on the substrate; a first flow channel is formed in the substrate, and a second flow channel is respectively formed in each of the flat tubes; the first flow channel and the second flow channel are connected into a loop to form a pulsating heat pipe flow channel between the substrate and the flat tubes; the surface of the substrate away from the flat tubes is used to contact a heat source, and heat exchange is performed with the heat source through a phase change medium filled in the pulsating heat pipe flow channel.

2. The radiator according to claim 1, wherein The plane where the first flow channel is located and the plane where the second flow channel is located are vertically arranged.

3. The radiator according to claim 2, wherein The second flow channel is a serpentine capillary structure, including a plurality of straight pipe segments and elbows connected between adjacent two straight pipe segments, and the straight pipe segments are arranged along the vertical direction of the plane where the first flow channel is located.

4. The radiator according to claim 1, wherein At least one first flow channel is formed in each substrate, the first flow channel is a serpentine capillary structure, each first flow channel corresponds to a flat tube respectively, and a second flow channel is respectively formed in each flat tube.

5. The radiator according to any one of claims 1 to 4, characterized in that The flow direction of the phase change medium in the pulsating heat pipe flow channel is from the first flow channel to the corresponding second flow channel.

6. The radiator according to claim 4, characterized in that, A support cover plate is covered on the surface of the substrate where the first flow channel is located, a communication hole is provided on the support cover plate, the position of the communication hole corresponds to the first flow channel, and a flat tube insert is respectively inserted into each communication hole to connect the second flow channel with the corresponding first flow channel.

7. The radiator according to claim 4, wherein The first flow channel and the second flow channel are sequentially connected end to end alternately to form the pulsating heat pipe flow channel.

8. The radiator according to claim 1, wherein It further includes a fin group, and the fin group is arranged on the flat tubes.

9. The radiator according to claim 1, characterized in that, An enhanced boiling structure is provided in the first flow channel, and / or an enhanced condensation structure is provided in the second flow channel.

10. A heat dissipation system, characterized in that, It includes a fan and the radiator according to any one of claims 1 to 9, and the fan is used to accelerate the gas flow speed around the flat tubes.

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