Machining die and machining method of radiator based on phase change cooling

Abstract

The invention relates to the technical field of heat dissipation, particularly provides a machining mold and a machining method of a radiator based on phase change cooling, and aims to solve the problem of how to machine and form a porous structure on the inner wall of an internal flow channel of the radiator so as to improve the heat dissipation efficiency. In order to achieve the purpose, the radiator comprises a main body part which is provided with a first end face and a second end face, the main body part is provided with a flow channel, and the two ends of the flow channel communicate with the first end face and the second end face correspondingly; the first end cover is arranged on the first end face; the second end cover is arranged on the second end surface; the machining mold comprises a first plugging piece, a plurality of column cores corresponding to the flow channels are connected to the first plugging piece, when the column cores stretch into the flow channels, one ends of the flow channels are sealed through the first plugging piece, and gaps are formed between the side surfaces of the column cores and the inner walls of the flow channels. The porous medium layer is formed on the inner wall of the flow channel in a sintering mode based on the machining mold, the boiling heat exchange performance in the phase change process of the radiator can be improved, and the heat dissipation performance of the radiator is improved.

Description

Technical Field

[0001] The present application relates to the field of heat dissipation technology, and specifically provides a processing mold and a processing method for a heat sink based on phase change cooling. Background Art

[0002] Currently in the power electronics industry, the heating problem of power devices during operation has always been a concern. The industry usually adopts the method of setting a heat sink on the surface of the power device to cool it to ensure that the operating temperature of the power device is within a controllable range.

[0003] Compared with air cooling, liquid cooling and other cooling methods, phase change cooling technology uses the principle of boiling and vaporizing when the cooling medium is heated, and removes heat through the latent heat of vaporization, so its cooling efficiency and stability are higher. In order to further enhance the boiling heat transfer performance, some related technologies propose to set a porous structure on the wall surface of the flow channel inside the radiator, increase the area of ​​the solid-liquid interface of the inner wall of the flow channel through the porous structure, provide more ideal vaporization cores when the cooling medium is heated and boiling, increase the frequency of bubble separation, and thus improve the heat transfer performance. However, how to form a porous structure on the inner wall of the flow channel has become a technical problem that needs to be solved in this field. Summary of the invention

[0004] The present application aims to solve the above technical problem, that is, to solve the problem of how to form a porous structure on the inner wall of the internal flow channel of the radiator to improve the heat dissipation efficiency.

[0005] In a first aspect, the present application provides a processing mold for a heat sink based on phase change cooling, the heat sink comprising:

[0006] A main body having a first end face and a second end face opposite to each other, wherein the main body is provided with a plurality of flow channels running therethrough, and two ends of the flow channels are respectively connected to the first end face and the second end face;

[0007] A first end cover, which is arranged on the first end surface, and the first end cover is provided with a liquid inlet hole connected with the flow channel;

[0008] a second end cover, which is arranged on the second end surface, and the second end surface is provided with an exhaust hole communicating with the flow channel;

[0009] The processing mold comprises:

[0010] The first blocking member is connected with a plurality of column cores corresponding to the flow channel. When the column cores extend into the flow channel respectively, the first blocking member closes one end of the flow channel, and a gap is formed between the side surface of the column core and the inner wall of the flow channel.

[0011] In a technical solution of the above-mentioned processing mold, a first positioning groove adapted to the cross-sectional shape of the main body is opened on the surface of the first sealing member facing the column core, and when the main body is embedded in the first positioning groove, the axis of the column core coincides with the axis of the flow channel.

[0012] In a technical solution of the above processing mold, the column core is detachably connected to the first blocking member, and the processing mold further includes:

[0013] A first locking member is used to fix the column core and the first blocking member.

[0014] In a technical solution of the above processing mold, the first locking member is a first screw, and the end surface of the column core is provided with a threaded hole adapted to the first screw;

[0015] The bottom surface of the first positioning groove is also provided with a plurality of first limiting grooves adapted to the cross-sectional shape of the column core. When the column core is embedded in the first limiting groove, the first screw can pass through the first blocking member and be threadedly connected with the column core.

[0016] In one technical solution of the above processing mold, the processing mold further includes:

[0017] The second blocking piece is detachably connected to the end of the column core away from the first blocking piece through a second locking piece. The second blocking piece is used to close the other end of the flow channel to form a closed space between the column core and the inner wall of the flow channel.

[0018] In one technical solution of the above-mentioned processing mold, a second positioning groove adapted to the cross-sectional shape of the main body is formed on the surface of the second blocking member facing the column core, and the main body can be embedded in the second positioning groove; and / or

[0019] The second locking member is a second screw, and a threaded hole adapted to the second screw is provided on the end face of the column core. A plurality of second limiting grooves adapted to the cross-sectional shape of the column core are provided on the second sealing member. When the column core is embedded in the second limiting groove, the second screw can pass through the second sealing member and be threadedly connected to the column core.

[0020] In one technical solution of the above-mentioned processing mold, a micro-groove structure or a protrusion structure is provided on the surface of the column core.

[0021] In a technical solution of the above-mentioned processing mold, the cross-section of the column core is rectangular.

[0022] In a second aspect, the present application provides a method for processing a heat sink based on phase change cooling, which is processed using a processing mold, wherein the processing mold includes a first blocking member, to which a plurality of column cores corresponding to flow channels of the heat sink are connected, and the processing method includes:

[0023] Providing a main body of a radiator to be processed;

[0024] Inserting the column core into the flow channel of the main body so that the first blocking member closes one end of the flow channel;

[0025] Filling powder material into the gap between the column core and the flow channel;

[0026] Sintering the processing mold and the main body to fix the powder material on the inner wall of the flow channel and form a porous medium layer;

[0027] The processing mold is separated from the main body.

[0028] In a technical solution of the above processing method, the processing mold further includes a second plugging member. After the step of "filling the gap between the column core and the flow channel with powder material", the processing method further includes:

[0029] Connecting the second blocking member to the main body so that the second blocking member closes the other end of the flow channel;

[0030] vibrating the main body;

[0031] Separating the second blocking member from the main body, and filling the gap between the column core and the flow channel with powder material again;

[0032] The above steps are repeated until the gap between the column core and the flow channel is tightly filled with powder material.

[0033] As mentioned above, in the case of adopting the above-mentioned technical solution, the present application adopts the above-mentioned processing mold to process the porous medium layer on the inner wall of the flow channel. After the column core is inserted into the flow channel, a gap is formed between the column core and the inner wall of the flow channel, and then the porous medium layer is formed by filling the gap with powder material to sinter. First of all, the processing process of the porous medium layer is relatively simple, and the requirements for equipment accuracy and technology are relatively low, and batch processing can be realized, which is conducive to reducing processing costs. Secondly, in the process of forming the porous medium layer, the column core plays a positioning role. By controlling the relative position relationship between the column core and the inner wall of the flow channel, the uniformity of the porous medium layer on the inner wall of the flow channel can be guaranteed as much as possible, that is, it is conducive to improving the molding quality of the porous medium layer. Finally, the porous medium layer formed by high-temperature sintering powder can form an irregular hole structure in the porous medium layer. Compared with the method of forming a rough surface by tool etching, the specific surface area of ​​the porous medium layer is larger, so the number of vaporization cores provided is more, and the frequency of bubbles leaving the porous medium layer is also greater, which is more conducive to improving the boiling heat exchange performance and improving the heat dissipation performance of the radiator. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, in which:

[0035] Figure 1 A heat sink based on phase change cooling according to an embodiment of the present application;

[0036] Figure 2 yes Figure 1 A longitudinal cross-sectional view of

[0037] Figure 3 yes Figure 1 A transverse cross-sectional view of

[0038] Figure 4 A processing mold for a heat sink based on phase change cooling according to an embodiment of the present application;

[0039] Figure 5 is a schematic diagram of the assembly relationship between a processing mold and a main body of a heat sink according to an embodiment of the present application;

[0040] Figure 6 is a schematic diagram of a processing mold according to a second embodiment of the present application;

[0041] Figure 7 is a schematic diagram of a processing mold according to a third embodiment of the present application;

[0042] Figure 8 is a schematic cross-sectional view of a column core according to an embodiment of the present application;

[0043] Fig. 9It is a flow chart of the main steps of a method for processing a heat sink based on phase change cooling according to an embodiment of the present application;

[0044] Fig.10 It is a detailed step flow chart of a method for processing a heat sink based on phase change cooling according to an embodiment of the present application.

[0045] In the figures, the reference numerals refer to the following:

[0046] 11. Main body; 110. Flow channel; 12. First end cover; 121. Liquid inlet hole; 122. Liquid inlet confluence channel; 13. Second end cover; 131. Exhaust hole; 132. Exhaust confluence channel; 21. First blocking member; 211. First positioning groove; 212. First limiting groove; 22. Column core; 23. First screw; 24. Second blocking member; 241. Second positioning groove; 242. Second limiting groove; 25. Second screw; 300. Gap. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not used to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0048] It should be noted that in the description of this application, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the relevant devices or components must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application. In addition, the ordinal numbers "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0049] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] For the radiator based on phase change cooling, a porous structure is set on the inner wall of its internal flow channel, so that the area of ​​the solid-liquid interface in the flow channel is increased, thereby being able to provide more ideal vaporization cores. The bubbles generated after the phase change boiling of the cooling medium stay on the surface of the porous medium for a shorter time, and the frequency of bubble detachment is increased, thereby enhancing the boiling effect and improving the boiling heat transfer performance.

[0051] As for how to form the above-mentioned porous structure on the radiator, in some related technologies, a specific tool is used to etch the surface of the flow channel to form a rough surface on the inner wall of the flow channel. However, the above method requires the use of equipment such as CNC machine tools and the control of the tool feeding along a predetermined trajectory through program settings. Therefore, its processing cost and technical requirements are relatively high. On the other hand, when etching by the tool, the shape of the inner wall of the flow channel depends on the inherent structural form of the tool. It can only form an inherent texture structure on the inner wall of the flow channel, but cannot form an irregular porous medium layer, resulting in its effect of enhancing boiling heat transfer is not very ideal.

[0052] Reference Figure 1 , is a heat sink based on phase change cooling disclosed in an embodiment of the present application, which includes a main body 11, a first end cover 12 and a second end cover 13.

[0053] Reference Figure 2 and Figure 3 The main body 11 can be optionally a plate-like structure, and a plurality of flow channels 110 running through the main body 11 are formed on the main body 11. The plurality of flow channels 110 are arranged side by side, and one of the two opposite end faces of the main body 11 is called the first end face, and the other end face is called the second end face. The two ends of the flow channel 110 are respectively connected to the first end face and the second end face.

[0054] The first end cover 12 is disposed on the first end surface, and a liquid inlet hole 121 communicating with the flow channel 110 is disposed on the first end cover 12. It should be noted that a concave cavity is also disposed on the surface of the first end cover 12 facing the main body 11, and a liquid inlet confluence channel 122 is formed between the concave cavity and the liquid inlet of the flow channel 110, and the extension direction of the liquid inlet confluence channel 122 is perpendicular to the extension direction of the flow channel 110, so that the cooling medium can flow laterally along the liquid inlet confluence channel 122 and enter each flow channel 110.

[0055] The second end cover 13 is disposed on the second end surface, and an exhaust hole 131 communicating with the flow channel 110 is disposed on the second end cover 13. It should be noted that a concave cavity is also disposed on the surface of the second end cover 13 facing the main body 11, and the concave cavity is connected to the exhaust port (in Figure 2Taking the view state of the radiator in the middle as an example, since it is a phase change cooling method, after the cooling medium changes from liquid to gas, the gaseous medium moves upward, so the lower end of the flow channel is the liquid inlet, and the upper end is the exhaust port) forms an exhaust confluence channel 132, and the extension direction of the exhaust confluence channel 132 is perpendicular to the extension direction of the flow channel 110, so that the gaseous medium from each flow channel 110 can flow laterally along the exhaust confluence channel 132 and be collected and discharged from the exhaust hole 131. It should be understood that, corresponding to the specific application, the number of the exhaust holes 131 and the liquid inlet hole 121 can be adaptively adjusted according to the heat dissipation power requirements, and the adjustment of the number and relative positions of the exhaust holes 131 and the liquid inlet hole 121 should be within the protection scope of this application.

[0056] It should be noted that, during the production process, the main body 11, the first end cover 12 and the second end cover 13 can be manufactured and processed separately, and then the first end cover 12 and the second end cover 13 are respectively welded and fixed to the main body 11. At the same time, the present application aims to form a porous medium layer (not shown in the figure) on the inner wall of the flow channel 110 to enhance the boiling heat transfer performance and improve the heat dissipation performance of the radiator.

[0057] Reference Figure 4 , is a processing mold for a heat sink based on phase change cooling according to an embodiment of the present application, which includes a first blocking piece 21 and a column core 22. Among them, the number of column cores 22 is the same as the number of flow channels 110 in the main body 11 of the heat sink, and the column cores 22 correspond to the flow channels 110 one by one. The cross-sectional shape of the column core 22 is basically the same as the cross-sectional shape of the flow channel 110, and the cross-sectional area of ​​the column core 22 is smaller than the cross-sectional area of ​​the flow channel 110, so that the column core 22 can be inserted into the flow channel 110. The column core 22 is connected to the first blocking piece 21. For example, in one implementation of the present application, the column core 22 can be fixedly connected to the first blocking piece 21, and the two are integrally formed and manufactured during processing.

[0058] Reference Figure 5 , is a diagram showing the assembly relationship between the processing mold and the main body 11 during the process of using the processing mold to process the porous medium layer on the inner wall of the flow channel 110. The following introduces the use of the processing mold in conjunction with the actual processing process of the radiator.

[0059] After the flow channel 110 is formed on the main body 11 of the radiator, the processing mold is taken and the column core 22 is respectively extended into the flow channel 110, so that the first plugging member 21 is in close contact with the end face of the main body 11. At this time, the first plugging member 21 closes one end of the flow channel 110 (the lower end in the figure), and a gap 300 is formed between the column core 22 and the inner wall of the flow channel 110. Then, the open end of the flow channel 110 is kept upward, and the powder material (the powder material can be a metal powder with high thermal conductivity such as aluminum powder and copper powder) is filled into the above gap 300, and then the main body 11 and the processing mold are kept in this posture and placed in a sintering furnace for high-temperature sintering, so as to form a porous medium layer in the above gap 300, and at the same time, the porous medium layer is bonded to the inner wall of the flow channel 110 under the action of high temperature, and finally the processing mold is separated from the main body 11.

[0060] As mentioned above, the present application uses the above-mentioned processing mold to process the porous medium layer on the inner wall of the flow channel 110. After the column core 22 is inserted into the flow channel 110, a gap 300 is formed between the column core 22 and the inner wall of the flow channel 110. Then, the porous medium layer is formed by filling the gap 300 with powder material for sintering. First, the processing process of the porous medium layer is relatively simple, and the requirements for equipment accuracy and technology are relatively low. In addition, batch processing can be achieved, which is conducive to reducing processing costs. Secondly, in the process of forming the porous medium layer, the column core 22 plays a positioning role. By controlling the relative position relationship between the column core 22 and the inner wall of the flow channel 110, the uniformity of the porous medium layer on the inner wall of the flow channel 110 can be guaranteed as much as possible, which is conducive to improving the molding quality of the porous medium layer. Finally, the porous medium layer formed by high-temperature sintering of powder can form an irregular pore structure in the porous medium layer. Compared with the method of forming a rough surface by tool etching, the porous medium layer has a larger specific surface area, so it provides more vaporization cores and a greater frequency of bubbles leaving the porous medium layer, which is more conducive to improving the boiling heat transfer performance and improving the heat dissipation performance of the radiator.

[0061] On the other hand, the prior art uses tool processing to form a texture structure on the inner wall of the flow channel, which is limited by the tool structure shape, size and other factors, making it difficult to form fine textures. The present application is based on powder filling and sintering to form a porous medium layer. The porosity and pore size can be finely controlled by adjusting parameters such as powder size, sintering temperature, and sintering time, which is more conducive to improving the enhanced boiling heat transfer performance.

[0062] Reference Figure 6In an optional implementation of the present application, the cross-sectional area of ​​the first blocking member 21 is greater than the cross-sectional area of ​​the main body 11, and a first positioning groove 211 is provided on the surface of the first blocking member 21 facing the column core 22. The cross-sectional shape of the first positioning groove 211 is adapted to the cross-sectional shape of the main body 11, so that in the process of inserting the column core 22 into the flow channel 110, the main body 11 is directly embedded in the first positioning groove 211. At this time, the axis of the column core 22 coincides with the axis of the flow channel 110, so that the distance from each position on the circumferential direction of the side surface of the column core 22 to the flow channel 110 is equal, which is beneficial to control the uniformity of the thickness of the porous medium layer at each position on the inner wall of the flow channel 110 and improve the molding quality of the porous medium layer.

[0063] In one embodiment of the present application, the column core 22 and the first blocking member 21 can also be fixed in a detachable connection manner. In this case, a first locking member is provided between the column core 22 and the first blocking member 21, and the disassembly and fixation between the column core 22 and the first blocking member 21 are achieved through the first locking member.

[0064] For example, refer to Figure 6 In one implementation, the first locking member is a first screw 23, a threaded hole adapted to the first screw 23 is opened on one of the end faces of the column core 22, a through hole corresponding to the threaded hole is opened on the first blocking member 21, and the first screw 23 passes through the first blocking member 21 and is threadedly connected to the column core 22.

[0065] Furthermore, in order to facilitate the alignment of the threaded holes on each column core 22 with the through holes on the first blocking member 21, a first limiting groove 212 is further provided on the bottom surface of the first positioning groove 211. The cross-sectional shape of the first limiting groove 212 is adapted to the cross-sectional shape of the column core 22, so that during the assembly process of the first blocking member 21 and the column core 22, the column core 22 only needs to be inserted into the first limiting groove 212 to screw the first screw 23. On the other hand, during the process of screwing the first screw 23, the first limiting groove 212 also limits the rotation of the column core 22, which is conducive to rapid installation.

[0066] As described above, the present application sets the first plugging member 21 and the column core 22 in a detachable connection, so that when a column core 22 is damaged, it can be replaced separately. In addition, column cores 22 of different shapes can be selected to be connected to the first plugging member 21 according to needs, so as to process porous medium layers of different thicknesses or different structural forms.

[0067] Reference Figure 7 As a possible implementation of the present application, the processing mold further includes a second blocking member 24, and the second blocking member 24 is connected to the end of the column core 22 away from the first blocking member 21 through a second locking member.

[0068] By respectively arranging the first blocking member 21 and the second blocking member 24 at both ends of the main body 11, after the first blocking member 21 and the column core 22 are installed, firstly, the powder material is filled into the gap 300 through the open end of the flow channel 110, and after the filling is completed, the second blocking member 24 and the other end of the column core 22 are sealed, at this time, a closed space is formed between the flow channel 110 and the column core 22, and then the processing mold and the main body 11 are oscillated to make the powder material settle under the action of the oscillation force and gravity, thereby enhancing the compactness of the powder material filling, and then the second blocking member 24 is disassembled, and the powder material is filled into the gap again, and then the second blocking member 24 is connected to the column core 22 again and oscillated, and the above process is repeated continuously until the gap is tightly filled with powder material and then sintering is performed.

[0069] As described above, the gap is sealed with the first sealing member 21 and the second sealing member 24 and then oscillated repeatedly, which can improve the compactness of the powder material filling in the gap, thereby improving the pore density of the porous medium layer after sintering and the overall structural strength of the porous medium layer, and preventing the porous medium layer from being damaged during the demolding process due to excessive pores in local positions, resulting in failure of the porous medium layer.

[0070] Similarly, the second blocking member 24 has a second positioning groove 241 adapted to the cross-sectional shape of the main body 11 on the surface facing the column core 22, and the main body 11 can be embedded in the second positioning groove 241. The second locking member can be a second screw 25, and the end surface of the column core 22 away from the first blocking member 21 has a threaded hole adapted to the second screw 25, and the second positioning groove 241 has a second limiting groove 242 adapted to the cross-sectional shape of the column core 22. After the column core 22 is embedded in the second limiting groove 242, the second screw 25 can pass through the second blocking member 24 and be threadedly connected to the column core 22. The above arrangement is similar to the assembly form between the first blocking member 21 and the column core 22, and the technical effects achieved are also the same, and this application will not be elaborated on in detail.

[0071] In some implementations of the present application, the cross section of the column core 22 is set to be rectangular, and can be further selected to be square, in order to increase the specific surface area of ​​the porous medium layer, thereby enhancing the boiling heat transfer performance during the phase change process. Of course, the above configuration does not constitute a limitation to the present application, and in some other implementations of the present application, the cross section of the column core 22 may also be circular, triangular or other irregular shapes.

[0072] Optionally, the surface of the column core 22 is also provided with a micro-groove structure or a protrusion structure. Figure 8The microgroove structure can be a semicircular groove with a cross section opened along the axial direction of the column core 22. Of course, the specific form of the groove is not limited thereto, and can also be a triangle, trapezoid, rectangle or sawtooth, or a discontinuous groove or convex point structure, etc. The present application does not limit its specific shape. The above-mentioned microgroove structure or convex structure is arranged on the surface of the column core 22 to increase the contact area between the porous medium layer and the phase change medium, thereby increasing the heat exchange area and improving the boiling heat exchange performance.

[0073] The present application also discloses a method for processing a heat sink based on phase change cooling, using the processing mold in any of the above embodiments. Fig. 9 , is a flow chart of the main steps of a method for processing a heat sink based on phase change cooling according to an embodiment of the present application, which includes the following steps:

[0074] S101: providing a main body of a heat sink to be processed.

[0075] It should be noted that the "main body of the radiator to be processed" in the above step S101 means that the main body has been processed to form the flow channel, which can be understood as the "semi-finished product" of the main body of the finished radiator. Specifically, the main body can be processed by one-piece molding, such as forming the flow channel by stamping on the plate structure, or directly molding by casting, and this application will not elaborate on this.

[0076] S102: inserting the column core into the flow channel of the main body so that the first blocking member closes one end of the flow channel.

[0077] S103: Filling the gap between the column core and the flow channel with powder material.

[0078] S104: Sintering the processing mold and the main body to fix the powder material on the inner wall of the flow channel and form a porous medium layer.

[0079] In step S104, during the sintering process, the open end of the flow channel should be kept facing upward, or other components should be used to press the open end of the flow channel to prevent leakage of powder material.

[0080] S105: Separate the processing mold from the main body.

[0081] After the demoulding process in step S105 is completed, the first end cover and the second end cover are respectively welded and fixed to the two ends of the main body, thus completing the overall assembly of the heat sink.

[0082] Reference Fig.10 , is a detailed step flow chart of a method for processing a heat sink based on phase change cooling according to an embodiment of the present application. Specifically, after step S103, the processing method further includes:

[0083] S1031: Connect the second blocking member to the main body so that the second blocking member closes the other end of the flow channel.

[0084] S1032: Oscillating the main body.

[0085] In step S1032, the main body may be vibrated by using a specific vibration device or by artificial vibration, which is not limited in the present application.

[0086] S1033: Separate the second plugging member from the main body, and fill the gap between the column core and the flow channel with powder material again.

[0087] The above steps S1031 to S1033 are repeated until the gap between the column core and the flow channel is tightly filled with powder material, and then the sintering process of step S104 is performed.

[0088] As mentioned above, the compactness of the powder material in the gap between the flow channel and the column core is improved through the above-mentioned repeated oscillation process, thereby improving the pore density of the porous medium layer after sintering and the overall structural strength of the porous medium layer, effectively ensuring the molding quality of the porous medium layer, and then improving the boiling heat transfer effect in the phase change process, thereby improving the heat dissipation performance of the radiator.

[0089] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A processing mold for a heat sink based on phase change cooling, characterized in that: The radiator comprises: A main body having a first end face and a second end face opposite to each other, wherein the main body is provided with a plurality of flow channels running therethrough, and two ends of the flow channels are respectively connected to the first end face and the second end face; A first end cover, which is arranged on the first end surface, and the first end cover is provided with a liquid inlet hole connected with the flow channel; a second end cover, which is arranged on the second end surface, and the second end surface is provided with an exhaust hole communicating with the flow channel; The processing mold comprises: The first blocking member is connected with a plurality of column cores corresponding to the flow channel. When the column cores extend into the flow channel respectively, the first blocking member closes one end of the flow channel, and a gap is formed between the side surface of the column core and the inner wall of the flow channel.

2. The processing mold according to claim 1, characterized in that: A first positioning groove matching the cross-sectional shape of the main body is formed on the surface of the first blocking member facing the column core. When the main body is embedded in the first positioning groove, the axis of the column core coincides with the axis of the flow channel.

3. The processing mold according to claim 2, characterized in that: The column core is detachably connected to the first blocking member, and the processing mold further comprises: A first locking member is used to fix the column core and the first blocking member.

4. The processing mold according to claim 3, characterized in that: The first locking member is a first screw, and the end surface of the column core is provided with a threaded hole adapted to the first screw; The bottom surface of the first positioning groove is also provided with a plurality of first limiting grooves adapted to the cross-sectional shape of the column core. When the column core is embedded in the first limiting groove, the first screw can pass through the first blocking member and be threadedly connected with the column core.

5. The processing mold according to any one of claims 1 to 4, characterized in that: The processing mold also includes: The second blocking piece is detachably connected to the end of the column core away from the first blocking piece through a second locking piece. The second blocking piece is used to close the other end of the flow channel to form a closed space between the column core and the inner wall of the flow channel.

6. The processing mold according to claim 5, characterized in that: A second positioning groove matching the cross-sectional shape of the main body is formed on the surface of the second blocking member facing the column core, and the main body can be embedded in the second positioning groove; and / or The second locking member is a second screw, and a threaded hole adapted to the second screw is provided on the end face of the column core. A plurality of second limiting grooves adapted to the cross-sectional shape of the column core are provided on the second sealing member. When the column core is embedded in the second limiting groove, the second screw can pass through the second sealing member and be threadedly connected to the column core.

7. The processing mold according to claim 1, characterized in that: The surface of the column core is provided with a micro-groove structure or a protrusion structure.

8. The processing mold according to claim 1, characterized in that: The cross section of the column core is rectangular.

9. A method for processing a heat sink based on phase change cooling, using a processing mold for processing, characterized in that: The processing mold includes a first blocking member, on which a plurality of column cores corresponding to the flow channels of the radiator are connected, and the processing method includes: Providing a main body of a radiator to be processed; Inserting the column core into the flow channel of the main body so that the first blocking member closes one end of the flow channel; Filling powder material into the gap between the column core and the flow channel; Sintering the processing mold and the main body to fix the powder material on the inner wall of the flow channel and form a porous medium layer; The processing mold is separated from the main body.

10. The processing method according to claim 9, characterized in that: The processing mold further includes a second plugging member. After the step of "filling the gap between the column core and the flow channel with powder material", the processing method further includes: Connecting the second blocking member to the main body so that the second blocking member closes the other end of the flow channel; vibrating the main body; Separating the second blocking member from the main body, and filling the gap between the column core and the flow channel with powder material again; The above steps are repeated until the gap between the column core and the flow channel is tightly filled with powder material.

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