A multi-dimensional phase change radiator and a manufacturing method thereof

Abstract

The present invention relates to a multi-dimensional phase change heat sink, comprising a front side plate of the heat sink located in the XOY plane, a first group of fins extending vertically from the front side plate of the heat sink to the Z direction and arranged at intervals; a plurality of second groups of fins are arranged at intervals in a direction perpendicular to the first group of fins; the first group of fins and the second group of fins are crisscrossed; at least part of the fins in the first group of fins are phase change fins, and the phase change fins have phase change steam channels; a phase change substrate is fixed on the outside of the front side plate of the heat sink, and the substrate phase change steam cavity is connected with the phase change steam channels of each fin to form a continuous and closed vacuum environment, and a certain amount of phase change working fluid is placed. The present invention is mainly aimed at natural convection heat sinks, and under the same heat dissipation boundary, the heat dissipation efficiency and uniformity are greatly improved, the weight of the heat sink is greatly reduced, and the volume of the heat sink is reduced; the structure is compact, the shape is regular, and the appearance is beautiful, and it is particularly suitable for heat dissipation of communication electronics, industrial transmission frequency conversion, inverter equipment and electronic components.

Description

Technical Field

[0001] The invention relates to a radiator, and in particular to a multi-dimensional phase change radiator and a manufacturing method thereof. Background Art

[0002] With the demands of computer, communication, military electronics and other market fields, electronic technology has developed rapidly, especially electronic chips have developed rapidly according to Moore's Law (the chip industry will double the number of integrated crystals on the product every 18 to 24 months). So we see the following facts: ① The packaging density of electronic devices is constantly increasing, and their heat flux density is constantly increasing; ② Electronic products are constantly developing in the direction of miniaturization, with greater power and smaller size; ③ Electronic products have penetrated into various fields, their application environment is constantly expanding, and the thermal environment used is very different. These development trends of electronic products make the problem of overheating of electronic equipment more and more prominent.

[0003] Overheating of electronic equipment is one of the main reasons for the failure of electronic products (the impact of high temperature on electronic products: insulation degradation; component damage; thermal aging of materials; cracking of low-melting-point welds and solder joint shedding. High temperature will also reduce the service life of capacitors; reduce the performance of transformer and choke insulation materials; and cause changes in the alloy structure of solder joints - IMC thickening, solder joints becoming brittle, and mechanical strength reduction; the increase in junction temperature will rapidly increase the current amplification factor of transistors, leading to an increase in collector current, which will further increase the junction temperature and ultimately lead to component failure). This seriously limits the improvement of electronic product performance and reliability and reduces the working life of the equipment.

[0004] Research data shows that if the temperature of semiconductor components rises by 10°C, the reliability decreases by 50%. 55% of the failures of electronic equipment are caused by excessive temperature. Therefore, the temperature rise in electronic equipment must be controlled, and the use of good heat dissipation measures (heat dissipation technology, radiator) is the key to solving the heat dissipation problem.

[0005] Conventional air cooling now mainly includes forced air cooling and natural convection cooling. The cooling caused by fluid movement through fans and other external forces is called forced convection cooling. Forced air cooling often uses fans to force fluid to flow through the radiator, and heat is taken out of the system through heat exchange between the fluid and the radiator. The presence of forced convection power components such as fans will cause problems such as noise, safety, reliability, life, and reduced IP level.

[0006] Natural convection heat dissipation refers to the flow caused by the uneven temperature field of the fluid itself without relying on external forces such as fans. The fluid involved in heat exchange forms a density difference due to the uneven temperature of each part, which causes the convection heat transfer phenomenon caused by buoyancy in the gravity field or other force fields. The heat dissipation capacity of natural convection is poorer than that of forced convection. The volume of the radiator is larger than that of forced convection radiator at the same heat power consumption. However, it has the characteristics of maintenance-free, noise-free, high reliability and safety, and high IP grade. It is more suitable for applications with high requirements for maintenance, reliability, and safety, such as communication base stations, rail transit converters, and green energy converters.

[0007] However, the existing natural convection heat dissipation has poor heat transfer and heat dissipation capabilities. The heat exchange coefficient of a conventional air natural convection radiator is generally 5 to 25 W / (m2*K), which results in a larger size and heavier weight of the natural convection radiator. Summary of the invention

[0008] The purpose of the present invention is to provide a multi-dimensional phase change heat sink and a preparation method thereof, which can greatly improve the heat dissipation efficiency and heat dissipation uniformity, and can greatly reduce the weight and volume of the heat sink under the same heat dissipation efficiency.

[0009] The present invention adopts the following technical solutions:

[0010] A multi-dimensional phase change heat sink comprises a heat sink front side plate 13 located in an XOY plane, a first group of fins extending vertically from the heat sink front side plate 13 in the Z direction and arranged at intervals; a plurality of second groups of fins are arranged at intervals in a direction perpendicular to the first group of fins; the first group of fins and the second group of fins are crisscrossed; at least part of the fins in the first group of fins are phase change fins 1, and the phase change fins 1 have fin phase change steam channels 101; a phase change substrate 1 is fixed on the outer side of the heat sink front side plate 13, and a phase change substrate steam cavity 5 is provided between the two, and the phase change substrate steam cavity 5 is connected with each fin phase change steam channel 101 to form a closed, vacuum space for storing phase change working fluid.

[0011] Preferably, the second group of fins and some of the fins in the first group of fins are solid fins 2.

[0012] Preferably, the multi-dimensional phase-change heat sink has a rectangular structure.

[0013] Preferably, a group of support structures 7 are formed on the front side plate 13 of the radiator, and are fixedly connected to the phase change substrate 1 through the support structures 7. The support structures 7 also serve as heat transfer nodes between the phase change substrate 1 and the front side plate 13 of the radiator.

[0014] Preferably, the fin phase-change steam channel 101 is in the shape of a long slot-shaped groove 6 on the front side plate 13 of the radiator, and the interior of the long slot-shaped groove 6 is a square or arc-shaped groove 9 .

[0015] Furthermore, a reinforcing rib 10 is processed on the front side plate 13 of the radiator.

[0016] A method for manufacturing the above-mentioned multi-dimensional phase change heat sink comprises the following steps:

[0017] S1, manufacturing a profile consisting of a first set of fins and a second set of fins that are crisscrossed by aluminum extrusion;

[0018] S2, machining a long groove 6 along at least part of the first group of fins from the front side plate 13 of the profile radiator by NC machining, and machining a square or arc-shaped groove 9 along the long groove 6; and machining a support structure 7 on the front side plate 13 of the profile radiator at the same time;

[0019] S3, continue to process a blind hole groove of a set shape and depth along the long groove 6;

[0020] S4, sealingly welding the phase change substrate 1 to the front side plate 13 of the profile radiator, leaving a phase change substrate steam cavity 5 between the phase change substrate and the front side plate 13 of the profile radiator, and the phase change substrate steam cavity 5 is connected to the blind hole groove.

[0021] Preferably, the second group of fins, i.e., the fins 2, have a thickness of 1.0 to 4.0 mm, the first group of fins have a thickness of 2.0 to 6.0 mm, and the spacing is 10.0 to 16.0 mm; the spacing of the fins 2 distributed transversely in the Z direction is 12.0 to 25.0 mm, and the fin height is 50.0 to 150.0 mm; the thickness of the front side plate 13 of the profile radiator is 2.0 to 20 mm;

[0022] Preferably, in step S3, the long groove has a groove depth of 60 to 130 mm and a groove width of 1.5 to 4.0 mm, and a support structure 7 for welding is processed when processing the long groove; alternatively, a saw blade slotting machine is used to process the arc groove 9, and the groove depth is 60 to 130 mm according to the width of the radiator and the radius of the slotting saw blade, and saw blades of different thicknesses of 1.5 to 4.0 mm are selected according to the groove width requirements.

[0023] Preferably, a sealing welding process such as vacuum brazing, gas shielded welding, stir friction welding, and high-power laser or electron beam welding is used, and a support step 7 is processed on the front side plate 13 of the profile radiator before welding. The width of the support step 7 is 2 to 5 mm.

[0024] Furthermore, a reinforcing rib 10 is added to the front side plate 13 of the profile radiator, and the reinforcing rib 10 is a cylindrical reinforcing rib and / or a long strip reinforcing rib structure.

[0025] Preferably, after the sealing shell is processed, it is ultrasonically cleaned and dried; a sintering powder fixture is used to add sintering powder on the inner surface of the phase change substrate 3, and the thickness of the sintering powder is limited. Sintering powder particles of different materials, shapes and particle sizes are selected to sinter a sintered capillary layer on the inner surface of the substrate shell, and the thickness is generally 0.5mm to 3.0mm; the sintered substrate shell is cleaned by ultrasonic cleaning and dried, and the phase change substrate 3 is sealed and welded to the cold plate shell by at least one of laser welding, electron beam sintering, FSW, TIG, and MIG welding processes; the process tail pipe is welded to the process hole position of the radiator. The sealing test of the radiator sealing shell is carried out through the welded process tail pipe: a helium mass spectrometer leak detection device is used for leak detection, the helium leak detection pressure is 600±50Kpa, the time is 60-90s, and the judgment standard is <1.0*10-7mbar.l / s; the space storing the phase change working fluid is evacuated through the process tail pipe, and the vacuum degree is required to be <20Pa; then the working fluid is injected through the process tail pipe, and the amount of the working fluid is calculated according to the capillary structure thickness and the steam cavity; the process tail pipe is sealed with a sealing tool, and the sealing point is melted and sealed by TIG, high-power laser or electron beam welding; and the appearance is finely processed.

[0026] The beneficial effects of the present invention are:

[0027] 1) For natural convection radiators, the heat dissipation efficiency and heat dissipation uniformity can be greatly improved. Under the same heat dissipation efficiency, the weight and volume of the radiator can be greatly reduced.

[0028] 2) The structure is compact, the cubic shape is very regular and beautiful, especially suitable for heat dissipation of electronic equipment and electronic components;

[0029] 3) The production process is simple, efficient and ingenious.

[0030] 4) The entire production process and effect verification process are disclosed in detail, which is highly reliable;

[0031] 5) The cost is controllable, the process is convenient and efficient, the heat dissipation effect is very good, and it has the prospect of wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the appearance of a conventional natural convection radiator in the prior art.

[0033] Figure 2 yes Figure 1 The temperature distribution gradient change diagram of the substrate surface of the corresponding natural convection heat sink.

[0034] Figure 3 yes Figure 1The temperature distribution gradient change diagram of the corresponding natural convection heat sink's fin surface.

[0035] Figure 4 This is an appearance diagram of the multi-dimensional phase change heat sink of the present invention after it is manufactured.

[0036] Figure 5 yes Figure 4 The corresponding temperature distribution gradient change diagram of the surface where the phase change substrate of the multi-dimensional phase change heat sink of the present invention is located.

[0037] Figure 6 yes Figure 4 The corresponding temperature distribution gradient change diagram of the surface where the fins of the multi-dimensional phase change heat sink of the present invention are located.

[0038] Figure 7 This is a schematic diagram of the internal structure after cutting along the XOZ plane. The figure shows the schematic diagram of heat transfer from the phase change substrate to a distant place.

[0039] Figure 8 It is a schematic diagram of the structure of the profile to be processed by NC.

[0040] Fig. 9 This is a view of a profile base with a long groove formed on it. In this figure, the profile base is relatively thin.

[0041] Fig.10 This is a view of a profile base having long grooves formed therein and a supporting structure (for welding) being machined. In this figure, the profile base is relatively thick.

[0042] Fig.11 It is a schematic diagram showing the arc-shaped groove inside the long groove through sectioning.

[0043] Fig.12 In one embodiment, a schematic diagram of a circular support step on a profile base and a long reinforcing rib is shown.

[0044] Fig.13 It is a schematic diagram of a long strip supporting step and a long strip reinforcing rib on a profile base in another embodiment.

[0045] In the figure, 1. phase change fin, 2. fin, 3. phase change substrate, 4. heat source, 5. phase change substrate steam cavity, 6. long slot-shaped groove, 7. supporting structure, 8. profile substrate, 9. arc-shaped groove, 10. reinforcing rib, 11. processed fin, 12. heat dissipation fin, 13. profile substrate. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0047] Comparative Example (as a comparison with the prior art):

[0048] Figure 1 It is a conventional natural convection radiator with structural dimensions of 120mm×130mm×120mm (Fin height is 106mm), tooth bottom thickness of 1.5, number of teeth of 12, radiator material of Al6063, and simulation analysis boundary conditions of 80W heat source power consumption, 50mm×50mm heat source contact area, natural convection, and ambient temperature of 45℃.

[0049] See also Figure 2-Figure 3 , Figure 2 Figure 3 The above model and boundary conditions are used to analyze the temperature gradient of the heat sink using natural convection simulation. From the temperature gradient distribution of the substrate, the temperature gradient in the heat source area is higher, with the highest temperature being 96.1°C; and the temperature gradient from the center of the heat source to the four corners of the substrate is larger, with the maximum temperature difference being 11K, so the heat distribution on the surface of the heat sink substrate is uneven. Figure 3 The temperature gradient diagram of the fin shows that there is also a large temperature gradient difference from the substrate side to the far end of the fin, with a temperature difference of about 10K.

[0050] visible, Figure 2 , 3 Conventional radiators have very uneven heat distribution in natural convection applications. The high temperature area is mainly concentrated in the heat source area. The temperature of the fins close to the substrate in this area is higher, and the heat exchange efficiency is also higher. However, the heat exchange efficiency is also reduced due to the lower temperature away from the heat source area. Similarly, on the fin side, the fin temperature is higher in the area close to the substrate, and the temperature on the side away from the substrate is significantly lower than that on the substrate side due to the limitation of heat conduction materials, thereby reducing the heat exchange efficiency.

[0051] Embodiments of the present application:

[0052] Figure 4 This is the appearance structure of the multi-dimensional phase change natural convection radiator of this embodiment. The radiator structure dimensions are: 120mm×130mm×120mm (of which the Fin height is 106mm), the number of teeth: 8+2 (8 phase change channel fins + 2 conventional aluminum fins on the two side walls); the radiator sealing shell material is: Al6063; the simulation analysis boundary conditions are: the heat power consumption of the heat source is 80W, the heat source contact area is: 50mm×50mm, natural convection is used, and the ambient temperature is set to: 45°C.

[0053] Figure 5 Figure 6The above model and boundary conditions are used to analyze the temperature gradient of the heat sink using natural convection simulation. From the temperature gradient distribution of the substrate, the temperature gradient in the heat source area is relatively high, with the highest temperature being 85.7°C; the temperature gradient from the center of the heat source to the four corners of the substrate is not large, with the maximum temperature difference <1K, and the heat distribution on the surface of the heat sink substrate is very uniform. Figure 6 The temperature gradient diagram of the fin shows that the temperature gradient difference from the substrate side to the far end of the fin is large, and the temperature difference is about 2 to 3K.

[0054] From the simulation analysis results, the heat sink using the multi-dimensional phase change temperature equalization technology in this embodiment has greatly improved both the temperature uniformity of the substrate surface and the temperature difference of the fins, thereby improving the heat exchange performance of the heat sink. The same grid-type fin design increases the channel effect of air buoyancy; therefore, under the same boundary conditions, the maximum temperature of the heat sink substrate is reduced by about 10K compared to conventional heat sinks, and the improvement effect is obvious.

[0055] This multi-dimensional phase change heat sink has two elements: 1. The design of the overall structure, 2. The capillary structure of the sintered powder, and 3. The composite working fluid with high latent heat and compatibility with the shell material.

[0056] The material selection of this multi-dimensional phase change heat dissipation sealed shell is: excellent thermal conductivity, generally 80W / mK~400W / mK; good structural strength yield point is generally required to be 50MPa~800MPa, excellent weldability, including vacuum brazing, vacuum diffusion welding, gas shielded welding, stir friction welding, resistance welding, TIG, MIG, high-power laser welding, electron beam welding, etc. The main commonly used materials include: 1 series aluminum alloy, 3 series aluminum alloy, 5 series aluminum alloy, 6 series aluminum alloy, etc.

[0057] The capillary structure of sintered powder has the following main characteristics: metal or alloy particles with excellent heat transfer performance, particle diameter is 30 mesh to 250 mesh, and the metal particles are pure metal particles or multi-metal materials: including pure aluminum, aluminum-zinc alloy, aluminum-silicon alloy, etc.

[0058] The composite working fluid is required to have a phase change temperature suitable for the application environment (the commonly used phase change temperature is generally 15℃~100℃), a high latent heat of evaporation (80J / g~2260J / g), chemical stability and compatibility with the shell material, and meet the ODP and GWP environmental requirements. It includes fluorinated alkanes, fluorinated ethers, cycloalkanes and Freon substitutes.

[0059] Working principle of this multi-dimensional phase change radiator: The phase change area of ​​the new multi-dimensional phase change radiator is a vacuum-sealed sealed shell, the inner surface of the shell is sintered with a multi-component sintered powder capillary layer, and a certain amount of phase change working fluid is injected. When the heating element is working, it generates heat, which is transferred to the inner surface of the new multi-dimensional phase change radiator through the phase change cold plate shell (the material is generally aluminum and aluminum alloy), and the heat is transferred to the capillary structure layer and the inner surface of the shell through heat conduction, thereby exchanging heat with the working fluid. The working fluid absorbs the heat and changes from liquid to vapor. The heat is evenly diffused and transferred in the X and Y directions through the steam cavity through the substrate steam cavity, and the heat is transferred to the Z direction through the phase change fin steam channel, thereby realizing multi-dimensional uniform temperature phase change heat transfer. When heat is transferred through the phase change fins, the heat is transferred to the heat dissipation fins, so that the surface temperature of the radiator is evenly distributed, thereby improving the heat exchange capacity between the phase change fins and the heat dissipation fins and the natural convection air, and more efficiently dissipating the heat generated by the heat source. Figure 7 .

[0060] The production process of this multi-dimensional phase change heat sink is as follows: the structure is designed according to the natural simulation analysis of the multi-dimensional phase change heat sink, the heat sink fins (including phase change fins and solid heat sink fins) and the phase change sealing cavity are designed, and the heat source is close to the phase change substrate. Figure 7 The thickness of the heat dissipation fins (generally the fins arranged on the left and right sides and horizontally) is generally 1.0 to 4.0 mm, and the thickness of the phase change fins (generally the fins arranged vertically) is generally 2.0 to 6.0 mm. The spacing between the phase change fins is generally 10.0 to 16.0 mm. The phase change fins can be arranged continuously or at intervals, such as Figure 1 , 3 , 5, and 7 are phase change fins, while 2, 4, and 6 are heat dissipation fins. The spacing between heat dissipation fins in the Z direction is generally 12.0 to 25.0 mm. The fin height is generally 50.0 to 150.0 mm.

[0061] According to different product requirements, design and optimize the above dimensions, and after confirmation, make the corresponding profiles through aluminum extrusion. Its structure is as follows Figure 8 The thickness of the heat dissipation fins (generally the fins on the left and right sides and arranged horizontally) is generally 1.0-4.0mm, and the thickness of the fins to be processed (generally the fins arranged longitudinally, through subsequent processing, the phase change steam channel is processed) is generally 2.0-6.0mm. The spacing between the fins to be processed is generally 10.0-16.0mm, the spacing between the heat dissipation fins distributed horizontally along the Z direction is generally 12.0-25.0mm, and the thickness of the profile substrate is generally 2.0-20mm. The fin height is generally 50.0-150.0mm.

[0062] Through NC machining such as Fig. 9 , Fig.10 Long groove, groove depth 60 ~ 130mm, groove width 1.5 ~ 4.0mm. Figure 10The profile is thicker, 8.0 to 20 mm, and the welding support structure is processed when processing the long groove. Or through the saw blade slotting machine, processing such as Fig.11 The arc groove 9 has a groove depth of 60 to 130 mm according to the width of the heat sink and the radius of the slotting saw blade. The saw blades of different thicknesses of 1.5 to 4.0 mm are selected according to the groove width requirements. It should be noted that the shape of the arc groove 9 is not necessarily an arc, but can also be a square or other shape.

[0063] In order to ensure the overall cavity welding quality, vacuum brazing, gas shielded welding, stir friction welding and high-power laser or electron beam welding and other sealing processes are used. During the welding process, it is necessary to process support steps with a width of 2 to 5 mm. In order to ensure the structural strength of the radiator sealing cavity, it is necessary to increase the following Fig.12 Cylindrical reinforcement or Fig.13 Long strip reinforcement structure.

[0064] After the sealing shell is processed, it is ultrasonically cleaned and dried.

[0065] A sintering powder fixture is used to add sintering powder on the inner surface of the substrate shell 13, and the thickness of the sintering powder is limited. Sintering powder particles of different materials, shapes and particle sizes are selected to sinter a sintering capillary layer on the inner surface of the substrate shell, and the thickness is generally 0.5mm to 3.0mm.

[0066] The sintered substrate shell is cleaned by ultrasonic cleaning, dried, and then the substrate shell is sealed and welded together with the cold plate shell by high-power laser welding, electron beam sintering, FSW, TIG, MIG and other welding processes.

[0067] After that, the process tail pipe is welded to the process hole position of the radiator. The sealing test of the radiator sealed shell is carried out through the welded process tail pipe, and the leak detection is carried out using the helium mass spectrometer leak detection equipment. The helium leak detection pressure is 600±50Kpa, the time is 60~90s, and the judgment standard is <1.0*10-7mbar.l / s. The sealed shell is then evacuated through the process tail pipe, and the vacuum degree is required to be <20Pa; then the working fluid is injected through the process tail pipe, and the amount of the working fluid is calculated according to the capillary structure thickness and the steam cavity.

[0068] The process tail pipe is sealed by a sealing tool, and the sealing point is melted and sealed by TIG, high-power laser or electron beam welding.

[0069] Finally, the appearance is refined to meet the relevant radiator structure size and assembly standards.

Claims

1. A multi-dimensional phase change heat sink, characterized in that: The invention comprises a radiator front side plate (13) located in the XOY plane, a first group of fins extending vertically from the radiator front side plate (13) in the Z direction and arranged at intervals; a plurality of second groups of fins are arranged at intervals in a direction perpendicular to the first group of fins; the first group of fins and the second group of fins are crisscrossed; In the first group of fins, at least some of the fins are phase change fins (1), and the phase change fins (1) have fin phase change steam channels (101); A phase change substrate (3) is fixed on the outside of the front side plate (13) of the radiator, and a phase change substrate steam cavity (5) is provided between the two. The phase change substrate steam cavity (5) is connected to each fin phase change steam channel (101), and forms a closed, vacuum space for storing phase change working fluid; A group of support structures (7) are machined and formed on the front side plate (13) of the radiator, and are fixedly connected to the phase change substrate (3) via the support structures (7), and the support structures (7) also serve as heat transfer nodes between the phase change substrate (3) and the front side plate (13) of the radiator; The fin phase-change steam channel (101) is in the shape of a long slot-shaped groove (6) on the front side plate (13) of the radiator, and the interior of the long slot-shaped groove (6) is a square or arc-shaped groove (9).

2. The multi-dimensional phase change heat sink according to claim 1, characterized in that: The second group of fins and some of the fins in the first group of fins are solid fins (2).

3. The multi-dimensional phase change heat sink according to claim 1, characterized in that: A reinforcing rib (10) is processed on the front side plate (13) of the radiator.

4. A method for manufacturing the multi-dimensional phase change heat sink according to claim 1, characterized in that: The following steps are involved: S1, manufacturing a profile consisting of a first set of fins and a second set of fins that are crisscrossed by aluminum extrusion; S2, machining a long groove (6) along at least part of the first group of fins from the front side plate (13) of the profile radiator by NC machining, and machining a square or arc-shaped groove (9) along the long groove (6); and machining a supporting structure (7) on the front side plate (13) of the profile radiator at the same time; S3, continue to process a blind hole groove of a set shape and depth along the long groove (6); S4. The phase change substrate (3) is sealed and welded to be fixed on the front side plate (13) of the profile radiator, and a phase change substrate steam cavity (5) is left between the phase change substrate and the front side plate (13) of the profile radiator, and the phase change substrate steam cavity (5) is connected to the blind hole groove.

5. The method for manufacturing a multi-dimensional phase change heat sink according to claim 4, characterized in that: The thickness of the first group of fins is 2.0-6.0 mm, and the spacing is 10.0-16.0 mm; the thickness of the second group of fins distributed laterally in the Z direction is 1.0-4.0 mm, and the spacing is 12.0-25.0 mm, and the fin height is 50.0-150.0 mm; the thickness of the front side plate (13) of the profile radiator is 2.0-20 mm.

6. The method for manufacturing a multi-dimensional phase change heat sink according to claim 5, characterized in that: In step S3, the groove depth of the long groove is 60 to 130 mm, and the groove width is 1.5 to 4.0 mm. When processing the long groove, a support structure (7) for welding is processed; or, a saw blade type slotting machine is used to process the arc groove (9). The groove depth is 60 to 130 mm according to the width of the heat sink and the radius of the slotting saw blade. Saw blades of different thicknesses of 1.5 to 4.0 mm are selected according to the groove width requirements.

7. The method for manufacturing a multi-dimensional phase change heat sink according to claim 5, characterized in that: The vacuum brazing, gas shielded welding, friction stir welding and high-power laser or electron beam welding sealing process are adopted. Before welding, a support step is processed on the front side plate (13) of the profile radiator. The width of the support step is 2 to 5 mm.

8. The method for manufacturing a multi-dimensional phase change heat sink according to claim 7, characterized in that: A reinforcing rib (10) is added to the front side plate (13) of the profile radiator, and the reinforcing rib (10) is a cylindrical reinforcing rib and / or a long strip reinforcing rib structure.

9. The method for manufacturing a multi-dimensional phase change heat sink according to claim 6, characterized in that: After the sealing shell is processed, it is ultrasonically cleaned and dried; Using a sintering powder fixture, add sintering powder on the inner surface of the phase change substrate (3), limit the thickness and shape of the sintering powder, select sintering powder particles of different materials, shapes and particle sizes, and sinter a sintering capillary layer on the inner surface of the substrate shell, with a thickness of 0.5 mm to 3.0 mm; The sintered substrate shell is cleaned by ultrasonic wave, dried, and the phase change substrate (3) is sealed and welded to the cold plate shell by at least one of laser welding, electron beam sintering, FSW, TIG, and MIG welding processes; Weld the process tail pipe to the process hole of the radiator; perform the sealing test of the radiator sealing shell through the welded process tail pipe: use the helium mass spectrometer leak detection equipment to detect leaks, the helium leak detection pressure is 600±50Kpa, the time is 60~90s, and the judgment standard is <1.0*10 -7 mbar.l / s; The space storing the phase change working fluid is evacuated through the process tail pipe, and the vacuum degree is required to be <20Pa; then the working fluid is injected through the process tail pipe, and the amount of the working fluid is calculated according to the thickness of the capillary structure and the volume of the steam cavity; The process tail pipe is sealed by sealing tooling, and the sealing point is melted and sealed by TIG, high-power laser or electron beam welding; Perform shape finishing.

Images