Round aluminum double-phase phase-change vapor chamber and manufacturing method thereof

Abstract

The invention discloses a round aluminum double-phase phase-change temperature-uniforming plate and a manufacturing method, the round aluminum double-phase phase-change temperature-uniforming plate comprises a temperature-uniforming plate body, the temperature-uniforming plate body comprises an upper body and a lower body which are matched with each other, an evaporation cavity is formed after the upper body and the lower body are matched with each other, and a working medium is arranged in the evaporation cavity; the temperature-uniforming plate body is arranged to be in a circular ring shape, a first through hole is formed in the center of the temperature-uniforming plate body, and the gravity center of the temperature-uniforming plate body coincides with the geometric center of the first through hole. According to the manufacturing method of the circular aluminum double-phase phase-change temperature-uniforming plate, the problems that the temperature-uniforming plate needs to keep dynamic balance in the rotating process, aluminum materials are prone to being oxidized in the welding process, and generated welding slag easily blocks a liquid injection groove are comprehensively considered, and compared with an existing temperature-uniforming plate, the circular aluminum double-phase phase-change temperature-uniforming plate is lower in price, lower in weight, excellent in mechanical strength and low in cost. And the requirement of the vapor chamber sensitive to the weight requirement is met, and dynamic balance can be kept in the high-speed rotating process.

Description

Technical Field

[0001] The present invention relates to the technical field of radiators, and in particular to a circular aluminum dual-phase phase-change temperature balancing plate and a manufacturing method thereof. Background Art

[0002] A vapor chamber is a vacuum cavity with a capillary structure on its inner wall. It's constructed from a metal shell, capillary structure, and working medium through processes like annealing, vacuuming, and sealing. When heat is transferred from the heat source to the evaporation zone, the working medium within the chamber, heated in a low vacuum environment, begins to vaporize. This process absorbs thermal energy and rapidly expands, rapidly filling the entire evaporation zone. When the vaporized working medium comes into contact with a cooler area, it condenses. This condensation releases the heat accumulated during evaporation, and the condensed working medium then returns to the heat source in the evaporation zone via the capillary structure. This process repeats itself within the chamber, achieving the desired heat dissipation effect.

[0003] Specific heat capacity (denoted by the symbol c) refers to the amount of heat absorbed or released per unit mass of an object per unit temperature change. Generally, the greater the specific heat capacity, the better the heat dissipation. The specific heat capacity of aluminum is 0.88 J / (g·°C), and that of oxygen-free copper is 0.39 J / (g·°C). Given the density of copper (8.95 g / cm³) and aluminum (2.7 g / cm³), copper weighs more than three times as much as aluminum for the same volume, while copper is typically more than three times as expensive. Therefore, aluminum is lightweight, has excellent thermal conductivity, is cheaper than copper, and has greater mechanical strength. The industry has long sought to replace copper in vapor chambers for low-power applications, meeting the requirements of low-power, high-strength, and low-cost thermal conductivity components.

[0004] However, existing heat spreaders are primarily made of copper or stainless steel. The fundamental reason for this is that the manufacturing process of heat spreaders cannot avoid welding copper shells to copper shells. Copper-to-copper welding does not require solder, or copper brazing materials are used as solder. This produces no slag after welding, and therefore, the liquid injection port and liquid injection groove will not be blocked during welding. The welding process between aluminum and aluminum is more difficult. Aluminum forms an oxide layer when left at room temperature, and it can only melt at temperatures above 2000°C. Because aluminum easily oxidizes, it must be removed using a deoxidizing solder combined with a flux. This inevitably produces slag after welding. The diameter of the liquid injection port and liquid injection groove is generally within 3mm, and slag often blocks the port and liquid injection groove. Brazing using a vacuum brazing process requires a layer of solder sheet to be sandwiched between the welding surfaces. However, during the welding melting process, slag often blocks the liquid injection port and liquid injection groove. This also makes aluminum temperature spreaders not successful. Another reason for the failure of aluminum temperature spreaders is that the existing temperature spreaders sinter a capillary structure on the inner wall of the copper shell, and mainly rely on the capillary structure to absorb water to achieve the reflux of the liquid medium. The existing temperature spreaders are generally thin flat plates. Taking the copper temperature spreader as an example, copper mesh or copper powder is sintered on the inner wall of the copper shell to form a capillary structure. The aluminum shell is easily oxidized, so its capillary structure cannot be completed using traditional sintering. This is also one of the reasons why aluminum temperature spreaders have not been realized.

[0005] Existing heat spreaders have high requirements for thermal power and are not very sensitive to their own weight. However, with the exponential growth of data and computing power, especially for circular heat spreaders that rotate with the heat source, the copper density is higher, resulting in a copper heat spreader of the same volume being heavier. The higher the rotation speed, the more sensitive it is to weight requirements. Therefore, the research and development of a circular aluminum dual-phase phase change heat spreader that can rotate at high speed has become an urgent problem to be solved in this field. Summary of the Invention

[0006] In response to the above-mentioned problems, the purpose of the present invention is to provide a circular aluminum two-phase phase change temperature equalizing plate and a manufacturing method, which comprehensively considers the problems that the temperature equalizing plate needs to maintain dynamic balance during rotation, the aluminum material is easily oxidized during welding, and the generated welding slag easily blocks the liquid injection tank; the circular aluminum two-phase phase change temperature equalizing plate manufactured has a lower price and lower weight, and meets the demand for temperature equalizing plates that are more sensitive to weight requirements.

[0007] To achieve the above objectives, the present invention provides a circular aluminum dual-phase phase change temperature equalizer, comprising a temperature equalizer body, the temperature equalizer body comprising a matching upper body and a lower body, a first capillary structure etched on the inner wall of the upper body, and a second capillary structure etched on the inner wall of the lower body, the first capillary structure and the second capillary structure being in communication, the upper body and the lower body being matched to form an evaporation chamber, wherein a working medium is provided in the evaporation chamber; The heat absorbing plate body is arranged in a circular shape, and a first through hole is provided at the center of the heat absorbing plate body. The center of gravity of the temperature homogenizing plate body coincides with the geometric center of the first through hole.

[0008] Preferably, a first protrusion is provided at the center hole of the lower body, a first groove is provided on the first protrusion, and an injection groove is provided on the lower body. One end of the injection groove is communicated with the first groove, and the other end is communicated with the evaporation cavity. The evaporation cavity, the injection groove and the first groove form a closed cavity.

[0009] Preferably, the lower body is provided with a main flow channel, the upper body is provided with a secondary flow channel, and the evaporation cavity, the main flow channel and the secondary flow channel are communicated with each other.

[0010] Preferably, a second protrusion is provided on the lower body, and a second groove is provided on the upper body. The second protrusion is located below the second groove, and the secondary flow channel is formed between the second protrusion and the second groove. The secondary flow channel divides the main flow channel into a first main flow channel and a second main flow channel. The evaporation chamber, the first main flow channel, the secondary flow channel, and the second main flow channel are connected in sequence.

[0011] Preferably, the temperature equalizing plate body also includes a plurality of guide columns evenly distributed circumferentially, and the two ends of the guide columns are respectively vertically connected to the upper body and the lower body; a third capillary structure is etched on the outer surface of the guide column, and the third capillary structure is connected to the adjacent first capillary structure and the second capillary structure; a plurality of support columns are provided on the lower body, and the two ends of the support columns are respectively vertically connected to the upper body and the lower body.

[0012] Preferably, in the working state, the rotation speed of the temperature equalizing plate body is 2000-4000 rpm, the diameter of the first through hole is greater than the length of the liquid injection groove; the first protrusion is provided with a liquid injection port, and the liquid injection port is perpendicular to and connected to the first groove; the liquid injection groove is provided with one of the trapezoidal cross-section, rectangular cross-section, circular cross-section, semicircular cross-section or elliptical cross-section structures.

[0013] The present invention also provides a method for manufacturing a circular aluminum dual-phase phase change temperature plate, comprising the following steps: S1. Fabricating an upper body blank and a lower body blank. Both the upper body blank and the lower body blank have a square cross-sectional structure. The upper body blank is provided with an upper trough body, and the lower body blank is provided with a lower trough body that cooperates with the upper trough body. The upper and lower trough bodies are arranged in a circular shape. A first through hole is provided at the center of the upper and lower trough bodies. The center of gravity of the upper and lower body blanks coincides with the geometric center of the first through hole. S2, etching the first capillary structure and the second capillary structure, etching the first capillary structure on the upper trough body and etching the second capillary structure on the lower trough body; S3, making a liquid injection groove, punching a liquid injection groove on the lower body blank; setting a first protrusion at the center hole of the lower body blank, and a first groove on the first protrusion, one end of the liquid injection groove is connected to the first groove, and a liquid injection port is provided on the first protrusion, and the liquid injection port and the first groove are perpendicular to each other and connected. S4, welding preparation, placing the carbon rod into the first groove; S5, welding the upper body blank and the lower body blank, and sealing the upper body blank and the lower body blank by first aluminum brazing, forming an evaporation chamber after welding. During the first aluminum brazing sealing process, the carbon rod is carbonized into carbon slag, and the first capillary structure and the second capillary structure in step S3 are provided on the inner wall of the evaporation chamber; S6, removing the carbon residue, clearing the carbon residue in the first groove, and sealing the end opening of the first groove; S7, helium side leakage check, flush helium into the liquid injection tank and evaporation chamber through the liquid injection port to detect whether there is side leakage. If there is side leakage, treat the side leakage. If there is no side leakage, the helium inspection is completed; S8, liquid medium injection and vacuuming, injecting liquid medium into the evaporation cavity through the liquid injection port, then vacuuming the evaporation cavity, performing a second aluminum brazing seal on the liquid injection port to keep the evaporation cavity and the liquid injection tank sealed, and obtaining a temperature-uniform plate blank, S9, machining the temperature-averaging plate blank, milling off the upper body blank to the edge of the upper body, milling off the lower body blank to the edge of the lower body, obtaining a circular temperature-averaging plate body, and making the gravity center of the temperature-averaging plate body coincide with the geometric center of the first through hole, obtaining a circular aluminum two-phase phase change temperature-averaging plate.

[0014] Preferably, the method further comprises the following steps: S21, constructing the secondary flow channel, providing a second groove on the upper body, and providing a second protrusion on the lower body, wherein the second protrusion is located below the second groove, and the secondary flow channel is formed between the second protrusion and the second groove; S91, before machining the temperature-averaged plate blank, milling off the first protrusion; The first aluminum brazing seal in S5 is performed by diffusion welding, with the solder treated with a deoxidizing agent, a welding temperature of 600-650° C., a welding time of 6-9 hours, and a welding pressure of 20-40 MPa; The second aluminum brazing seal in S9 is performed in a gas-protected atmosphere furnace, using solder at a temperature of 550-650°C and a welding time of 2-3.5 hours; The circular aluminum dual-phase phase change temperature averaging plate is made of pure aluminum or aluminum alloy; The solder includes 10-15% aluminum and 0.2-0.8% silicon, where the percentages are by mass.

[0015] Preferably, the carbon rod contains 35-65% carbon by weight, and is a straight rod that matches the first groove. Alternatively, the carbon rod includes a baffle, a metal wire perpendicular to the baffle, and a plurality of carbon blocks connected in sequence, wherein a second through hole cooperating with the metal wire is provided at the center of the carbon block, a third groove is provided at one end of the carbon block, and a third protrusion is provided at the other end.

[0016] The present invention also provides a circular aluminum radiator, comprising a temperature uniforming plate and a heat dissipation plate.

[0017] The beneficial effects of the present invention are as follows: the circular aluminum dual-phase phase change temperature-maintaining plate and its manufacturing method provided by the present invention are convenient for positioning and fixing by arranging the upper body blank and the lower body blank into a square structure, and are more convenient for keeping the center of gravity coincident with the geometric center of the first through hole, thereby ensuring the dynamic balance of the temperature-maintaining plate after the product is finished; by punching a liquid injection groove on the lower body blank, the liquid is injected into the evaporation cavity; by placing the carbon rod into the first groove before welding, carbon slag or welding slag is effectively prevented from mixing into the evaporation cavity, thereby ensuring the performance requirements of the temperature-maintaining plate, and waiting for the helium side leakage inspection and liquid medium injection. After insertion and vacuuming, the excess parts at the edges of the upper and lower body blanks are milled off to obtain a circular temperature equalizing plate body, and the center of gravity of the temperature equalizing plate body is made to coincide with the geometric center of the first through hole to complete the production of the circular temperature equalizing plate. This production method comprehensively considers the problem that the temperature equalizing plate needs to maintain dynamic balance during rotation, the aluminum material is easily oxidized during welding, and the generated welding slag is easy to clog the liquid injection tank; compared with the existing temperature equalizing plate, it has a lower price, lower weight, and excellent mechanical strength, which meets the needs of temperature equalizing plates that are more sensitive to weight requirements and can maintain dynamic balance during high-speed rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings illustrate exemplary embodiments of the present invention and together with the description serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0019] Figure 1 Schematic diagram of the structure of the circular aluminum dual-phase phase change temperature plate in Example 1; Figure 2 This is a schematic structural diagram of the lower body of the circular aluminum dual-phase phase change temperature equalizing plate in Example 1; Figure 3 This is a schematic structural diagram of the main body of the lower body of the temperature equalizing plate in Example 1; Figure 4 This is a schematic diagram of the structure of the temperature equalizing plate in the liquid-filled state during the manufacturing process of Example 1; Figure 5 This is a schematic diagram of the internal structure of the temperature equalizing plate in the liquid-filled state during the manufacturing process of Example 1; Figure 6 for Figure 4 Schematic diagram of the enlarged structure at A in the middle; Figure 7 This is a schematic diagram of the process for manufacturing the circular aluminum dual-phase phase change temperature-maintaining plate in Example 1; Figure 8 Schematic diagram of the structure of the carbon rod in Example 1; Figure 9 A schematic diagram of the structure of a circular aluminum dual-phase phase change temperature plate in Example 2; Figure 10 This is a schematic structural diagram of the lower body of the circular aluminum dual-phase phase change temperature equalizing plate in Example 2. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the relevant content and are not intended to limit the present invention. It should also be noted that, for ease of description, only portions relevant to the present invention are shown in the accompanying drawings.

[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] Example 1: Please refer to Figures 1 to 8 , this embodiment 1 includes: A circular aluminum dual-phase phase change heat spreader, comprising a heat spreader body, the heat spreader body comprising a matching upper body 1 and a lower body 2, a first capillary structure 31 etched on the inner wall of the upper body 1, and a second capillary structure 32 etched on the inner wall of the lower body 2, the first capillary structure 31 and the second capillary structure 32 being in communication, the upper body 1 and the lower body 2 cooperating to form an evaporation chamber 11, wherein the evaporation chamber 11 is provided with a working medium; The heat absorbing plate body is set in an annular shape and is made of aluminum, which can be pure aluminum or aluminum alloy. A first through hole 41 is provided at the center of the heat absorbing plate body. The center of gravity of the temperature homogenizing plate body coincides with the geometric center of the first through hole 41 .

[0023] The circular aluminum dual-phase phase change temperature-averaging plate in this embodiment is mainly used on a radiator that rotates with a heat source. The radiator includes a temperature-averaging plate and a heat sink. The heat source is usually a chip, which is located below the lower body 2. Water is used as the working medium. A large amount of heat is generated during operation. The heat is quickly transferred to the first capillary structure 31 and the evaporation chamber 11 through the lower body 2. Since the evaporation chamber 11 is close to a vacuum state, extremely low heat can make the water in the first capillary structure 31 and the evaporation chamber 11 absorb heat and change into water vapor. The water vapor continues to rise in the evaporation chamber 11, and the pressure in the evaporation chamber 11 is high. The first capillary structure 31 is used to store heat from the chip. The first capillary structure 31 is used to store heat from the chip. The second capillary structure 32 is used to store heat from the chip. The second capillary structure 32 is used to store heat from the chip. The first capillary structure 31 is used to store heat from the chip. The second capillary structure 32 is used to store heat from the chip. The second capillary structure 32 is used to store heat from the chip. The second capillary structure 31 is used to store heat from the chip. The second capillary structure 32 is used to store heat from the chip. The second capillary structure 31 is used to store heat from the chip. The second capillary structure 32 is used to store heat from the chip. The second capillary structure 31 is used to store heat from the chip. The second capillary structure 31 is used to store heat from the chip. The second capillary structure 31 is used to store heat from the chip.

[0024] Due to technical limitations, existing rotating heat spreaders are all made of copper or stainless steel alloys. Under the same volume conditions, they are heavier and more expensive. Higher rotation speeds are more sensitive to weight requirements. However, after using aluminum (pure aluminum or aluminum alloy) heat spreaders, the price and weight are lower. The center of gravity of the heat spreader body coincides with the geometric center of the first through hole 41, which can ensure the dynamic balance of the heat spreader during rotation.

[0025] A first protrusion 21 is provided at the center hole of the lower body 2, and a first groove 22 is provided on the first protrusion 21. A liquid injection groove 23 is provided on the lower body 2. One end of the liquid injection groove 23 is communicated with the first groove 22, and the other end is communicated with the evaporation chamber 11. The evaporation chamber 11 and the liquid injection groove 23 form a closed cavity. A liquid injection port 24 is provided on the first protrusion 21. During the manufacturing process, the first protrusion 21 is mainly used to inject liquid into the evaporation chamber 11 and to evacuate the vacuum. During the injection process, the liquid injection pipe 25 is connected to the liquid injection port 24 for injection. Liquid is injected into the evaporation chamber 11 through the liquid injection port 24, the first groove 22 and the liquid injection groove 23. When the liquid injection is completed, the liquid injection port 24 is closed to prevent liquid leakage. After the liquid injection and vacuuming, the first protrusion 21 can be milled off as a whole as needed, and the first through hole 41 can be kept as a complete circular hole, which is connected to the rotating shaft of the heat dissipation device for rotation. The first protrusion 21 can also be retained according to the needs of the rotating shaft to match the rotating shaft for rotation. Of course, the premise is that the temperature uniformity plate meets the dynamic balance requirements.

[0026] The lower body 2 is provided with a main flow channel, and the upper body 1 is provided with a secondary flow channel 12. The evaporation chamber 11, the main flow channel, and the secondary flow channel 12 are connected in sequence. The main flow channel is formed by the liquid injection groove 23 and the upper body 1, and the secondary flow channel 12 is formed by a groove set on the upper body 1.

[0027] The lower body 2 is provided with a second protrusion 26, and the upper body 1 is provided with a second groove 27. The second protrusion 26 is located below the second groove 27, and a secondary flow channel 12 is formed between the second protrusion 26 and the second groove 27. The secondary flow channel 12 divides the main flow channel into a first main flow channel and a second main flow channel. The first main flow channel is connected to the evaporation chamber 11, and the second main flow channel is connected to the secondary flow channel 12 and the liquid injection port 24. The evaporation chamber 11, the first main flow channel, the secondary flow channel 12, and the second main flow channel are sequentially connected. The height of the second protrusion 26 is higher than the lower bottom surface of the upper body 1. Before welding, the carbon rod is placed in the first groove 22, and the carbon rod just contacts the second protrusion 26. In this way, the carbonized carbon residue will also be located between the second protrusion 26 and the liquid injection port 24, effectively preventing the mixing of carbon residue in the evaporation chamber 11 and ensuring the performance requirements of the temperature distribution plate.

[0028] The main body of the temperature equalizing plate also includes a plurality of guide columns 81 evenly distributed around the circumference, and the two ends of the guide columns 81 are respectively vertically connected to the upper body 1 and the lower body 2; a third capillary structure is etched on the outer surface of the guide column 81, and the third capillary structure is communicated with the adjacent first capillary structure 31 and the second capillary structure 32; a plurality of support columns 82 are provided on the lower body 2, and the two ends of the support columns 82 are respectively vertically connected to the upper body 1 and the lower body 2. In the working state, the temperature equalizing plate rotates at a high speed, and the liquid working medium will be evenly distributed on the guide columns 81 under the action of centrifugal force during the reflux process. The guide columns 81 can accelerate the reflux speed and flow rate of water, making the heat dissipation more uniform and rapid, thereby improving the heat dissipation power and temperature equalization performance of the temperature equalizing plate. As the water vapor rises, the pressure in the evaporation chamber 11 increases, and the inner walls of the upper body 1 and the lower body 2 are generally less than 2 mm. At this time, the guide column 81 and the support column 82 can play a supporting role, preventing the upper body 1 and the lower body 2 from deformation or rupture when the pressure changes, thereby extending the service life of the temperature equalization plate.

[0029] In the working state, the rotation speed of the temperature equalizing plate body is 2000-4000 rpm. However, due to the small volume reserved for the radiator, in order to ensure that the width of the evaporation chamber 11 of the temperature equalizing plate is large within the limited space, the first through hole 41 can only be as small as possible, and the diameter of the first through hole 41 is smaller than the sum of the lengths of the first groove 22 and the injection groove 23. In order to prevent the solder from mixing into the evaporation chamber 11 during welding, the length of the injection groove 23 is shortened as much as possible in this embodiment, and the diameter of the first through hole 41 is larger than the length of the injection groove 23. In this way, when welding, a carbon rod is placed in the first groove 22, and the carbon rod is carbonized into carbon slag after welding. Since the length of the injection groove 23 is short, When the liquid is poured into the evaporation chamber 11, the inner diameter of the liquid injection groove 23 is made larger than the inner diameter of the first groove 22, which effectively prevents carbon residue from mixing into the evaporation chamber 11. The first protrusion 21 is provided with a liquid injection port 24, and the liquid injection port 24 and the first groove 22 are perpendicular to each other and communicate with each other; the liquid injection groove 23 has one of a trapezoidal cross-section, a rectangular cross-section, a circular cross-section, a semicircular cross-section or an elliptical cross-section structure. The liquid injection port 24 is set to facilitate connection with the first groove 22 through the liquid injection pipe 25, and to inject liquid into the evaporation chamber 11. The structure of the first groove 22 is to facilitate the shape of the carbon rod, the placement of the carbon rod and the removal of the carbon residue after carbonization, to ensure that the carbon residue inside the temperature homogenizing plate is cleaned, and the yield rate of the temperature homogenizing plate is guaranteed.

[0030] The specific production method includes the following steps: S1, the production of the upper body blank 101 and the lower body blank 102, the upper body blank 101 and the lower body blank 102 both have a square cross-sectional structure, the upper body blank 101 is provided with an upper trough body, and the lower body blank 102 is provided with a lower trough body that matches the upper trough body, the upper trough body and the lower trough body are arranged in a circular shape, and a first through hole 41 is arranged at the center of the upper trough body and the lower trough body, and the gravity center of the upper body blank 101 and the lower body blank 102 coincides with the geometric center of the first through hole 41; the upper trough body is the internal space area of the upper body 1, and the lower trough body is the internal space area of the lower body 2. The upper trough body and the lower trough body that match each other are welded to form the evaporation chamber 11 in the finished temperature uniformity plate, the upper body blank 101 and the lower body blank 102 both have a square cross-sectional structure, and the final finished temperature uniformity plate is circular. Compared with the circle, the square is easier to position, fix and set the center coincidence during the production process. S2, etching the first capillary structure 31 and the second capillary structure 32, etching the first capillary structure 31 on the upper trough body, and etching the second capillary structure 32 on the lower trough body; Unlike the existing copper heat spreader, the capillary structure is formed on the inner wall of the copper shell by sintering copper mesh or copper powder. However, the capillary structure of the aluminum shell cannot be completed by traditional sintering because aluminum is easily oxidized. In this embodiment, the capillary structure is formed by etching. High-speed rotation places high requirements on the dynamic balance of the finished heat spreader. Therefore, the width, depth and water locking rate of the capillary structure after etching need to be determined according to the dynamic balance requirements. S3, making the liquid injection groove 23, punching the liquid injection groove 23 on the lower body blank 102; setting a first protrusion 21 at the center hole of the lower body blank 102, and providing a first groove 22 on the first protrusion 21, one end of the liquid injection groove 23 is connected to the first groove 22, and providing a liquid injection port 24 on the first protrusion 21, and the liquid injection port 24 and the first groove 22 are perpendicular to each other and connected. S4, welding preparation: before welding, place the carbon rod into the first groove 22; after welding, the carbon rod is carbonized to form carbon slag. After cleaning the carbon slag, no solder and carbon slag remain in the first groove 22, effectively preventing carbon slag or welding slag from mixing into the evaporation chamber 11, ensuring the performance requirements of the temperature vapor chamber; S5, the upper body blank 101 and the lower body blank 102 are welded, and the upper body blank 101 and the lower body blank 102 are sealed by a first aluminum brazing, and the evaporation chamber 11 is formed after welding. During the first aluminum brazing sealing process, the carbon rod is carbonized into carbon slag, and the first capillary structure 31 and the second capillary structure 32 in step S3 are provided on the inner wall of the evaporation chamber 11; S6, removing the carbon residue, clearing the carbon residue in the first groove 22, and closing the end opening of the first groove 22; S7, helium side leakage check, flush helium into the liquid injection tank 23 and the evaporation chamber 11 through the liquid injection port 24 to detect whether there is side leakage. If there is side leakage, the side leakage is treated. If there is no side leakage, the helium inspection is completed; S8, liquid medium injection and vacuuming, liquid medium is injected into the evaporation cavity 11 through the liquid injection port 24, and then the evaporation cavity 11 is vacuumed, and the liquid injection port 24 is sealed by a second aluminum brazing process to keep the evaporation cavity 11 and the liquid injection tank 23 sealed, thereby obtaining a temperature-uniform plate blank. S9. Machining the heat balancing plate blank, milling off the excess portions at the edges of the upper and lower body blanks 101, 102. Specifically, milling off the portion from the upper body blank 101 to the edge of the upper body 1, and milling off the portion from the lower body blank 102 to the edge of the lower body 2. If necessary, the first protrusion 21 may also be milled off simultaneously to obtain a circular heat balancing plate body. The center of gravity of the heat balancing plate body is aligned with the geometric center of the first through-hole 41, thereby obtaining a circular aluminum dual-phase phase change heat balancing plate. The so-called excess portions at the edges of the upper and lower body blanks 101, 102 are the portions between the outer frames of the upper and lower body blanks 101, 102 and the outer edges of the heat balancing plate body.

[0031] Taking into account the need to maintain dynamic balance of the temperature equalizing plate during rotation, aluminum material is easily oxidized during welding, and the solder used produces welding slag that is difficult to clean and easily blocks the liquid injection groove 23. Different from the traditional method of making a temperature equalizing plate, the manufacturing method in this embodiment is to first set the upper body blank 101 and the lower body blank 102 into a square structure, and make the upper trough body, the lower trough body, and the first protrusion 21 on the square upper body blank 101 and the lower body blank 102. The square is convenient for positioning and fixing, so that its center of gravity is consistent with the geometric center of the first through hole 41, thereby maintaining dynamic balance, and then stamping the liquid injection groove 23 on the lower body blank 102, the first protrusion 21 is provided with a first groove 22, one end of the liquid injection groove 23 is communicated with the first groove 22, and the first protrusion 21 is provided with a liquid injection port 24, the liquid injection port 24 and the first groove 22 are perpendicular to each other and communicated, and the liquid injection port 24 is arranged to facilitate passage The liquid injection pipe 25 is connected to the first groove 22, and the liquid is injected into the evaporation chamber 11. Before welding, the carbon rod is first placed in the first groove 22. The structure of the first groove 22 is to facilitate the shape of the carbon rod and remove the carbon slag after carbonization, ensure that the carbon slag inside the temperature uniform plate is cleaned, and ensure the yield of the temperature uniform plate. The carbon rod is placed in the first groove 22 before welding; after welding, the carbon rod is carbonized to form carbon slag. After cleaning the carbon slag, no solder and carbon slag remain in the liquid injection groove 23 and the first groove 22, effectively preventing carbon slag or welding slag from mixing into the evaporation chamber 11, ensuring the performance requirements of the temperature uniform plate. After the helium side leakage check, liquid medium injection and vacuuming, the excess parts at the edges of the upper body blank 101 and the lower body blank 102 are milled off to obtain a circular temperature uniform plate body, and the center of gravity of the temperature uniform plate body is made to coincide with the geometric center of the first through hole 41 to complete the production of the circular temperature uniform plate, thereby obtaining a circular aluminum two-phase phase change temperature uniform plate.

[0032] The following steps are also included: S21, constructing the secondary flow channel 12, providing a second groove 27 on the upper body 1, and providing a second protrusion 26 on the lower body 2, the second protrusion 26 being located below the second groove 27, and the secondary flow channel 12 being formed between the second protrusion 26 and the second groove 27; The first aluminum brazing seal in S5 is performed by diffusion welding, with the solder treated with a deoxidizing agent, at a welding temperature of 600-650°C, a welding time of 6-9 hours, a welding pressure of 20-40 MPa, and drying after welding and assembly; The second aluminum brazing seal in S9 is performed in a gas-protected atmosphere furnace, using solder at a temperature of 550-650°C and a welding time of 2-3.5 hours; The circular aluminum dual-phase phase change temperature plate is made of pure aluminum or aluminum alloy; The solder includes 10-15% aluminum and 0.2-0.8% silicon, the percentages being by mass.

[0033] Because the pressure applied during welding is relatively small, the upper body blank 101 and the lower body blank 102 are heated as a whole and cooled with the furnace, so the overall plastic deformation of the temperature uniform plate after welding is very small, and the joint surface of the upper body blank 101 and the lower body blank 102 is difficult to see even with a microscope. The weld has high precision and small deformation, so that the upper body blank 101 and the lower body blank 102 can be similar to a whole after welding, effectively ensuring the sealing performance of the evaporation chamber 11.

[0034] The carbon content of the carbon rod is 35-65% by weight. The carbon rod includes a baffle 91, a metal wire 92 perpendicular to the baffle 91, and a plurality of carbon blocks 93 connected in sequence. A second through hole (not shown in the figure) is provided at the center of the carbon block 93 to match the metal wire 92. A third groove 95 is provided at one end of the carbon block 93, and a third protrusion 96 is provided at the other end. The carbon rod is composed of a plurality of carbon blocks 93 connected in series on the metal wire 92. The metal wire 92 is made of copper wire, iron wire, tungsten wire, etc. The melting point of the metal wire 92 is higher than the welding temperature of the first aluminum brazing seal, ensuring that the first aluminum brazing seal is sealed. It is not melted during the sealing welding process. As mentioned above, before welding, the carbon rod is placed in the first groove 22, and the baffle 91 is against the second protrusion 26. After welding, the carbon rod is carbonized to form carbon slag. The metal wire 92 is pulled out, and the metal wire 92 will pull out the carbon slag together with the baffle 91. Due to the presence of the baffle 91, the carbon slag is completely pulled out from the liquid injection groove 23 and the first groove 22, thereby effectively preventing carbon slag or welding slag from mixing into the evaporation chamber 11. The baffle 91 and the second protrusion 26 doubly ensure that the carbon slag will not be mixed into the evaporation chamber 11, thereby ensuring the performance requirements of the temperature equilibrium plate.

[0035] Example 2, as Figure 9-10 As shown, the difference from Example 1 is that: (1) the first protrusion 21 of the finished uniform temperature plate is milled off, (2) the second protrusion 26 and the second groove 27 are not set during the manufacturing process, the carbon rod before welding is a straight rod, and is directly placed in the first groove 22 and the injection groove 23 or directly placed in the first groove 22 before the first aluminum brazing seal welding, (3) the carbon rod is a straight rod, and the carbon rod is a straight rod that matches the main channel and the first groove 22, and the carbon content of the carbon rod is 35-65% by weight. The carbon rod is placed in the injection groove 23 and the first groove 22 before welding; after welding, the carbon rod is carbonized to form carbon slag. After cleaning the carbon slag, no solder and carbon slag remain in the injection groove 23 and the first groove 22, which effectively prevents carbon slag or welding slag from mixing into the evaporation chamber 11, ensuring the performance requirements of the uniform temperature plate.

[0036] In summary, the circular aluminum two-phase phase change temperature equalizing plate and its manufacturing method provided by the present invention are as follows: by arranging the upper body blank and the lower body blank into a square structure, the upper trough body, the lower trough body and the first protrusion are manufactured on the square upper body blank and the lower body blank, the square is convenient for positioning and fixing, and it is convenient to keep the center of gravity coincident with the geometric center of the first through hole, thereby maintaining dynamic balance; by punching a liquid injection groove on the lower body blank, a first groove is arranged on the first protrusion, one end of the liquid injection groove is communicated with the first groove, and a liquid injection port is provided on the first protrusion, the liquid injection port and the first groove are perpendicular to each other and communicated, the liquid injection port is arranged to facilitate connection with the first groove through the liquid injection pipe, and liquid is injected into the evaporation chamber; by placing the carbon rod into the first groove before welding, the structure of the first groove is convenient for the shape of the carbon rod, and the removal of carbon slag after carbonization, by extending the length of the first groove as much as possible, and shortening the length of the liquid injection groove as much as possible, to ensure The carbon slag inside the heat spreader is cleaned to ensure the yield of the heat spreader, effectively prevent carbon slag or welding slag from mixing into the evaporation chamber, and ensure the performance requirements of the heat spreader. After the helium side leakage inspection, liquid medium injection and vacuuming, the excess parts at the edges of the upper and lower body blanks are milled off to obtain a circular heat spreader body, and the gravity center of the heat spreader body is made to coincide with the geometric center of the first through hole to complete the production of the circular heat spreader, thereby obtaining a circular aluminum two-phase phase change heat spreader. This production method comprehensively considers the problems that the heat spreader needs to maintain dynamic balance during rotation, the aluminum material is easily oxidized during welding, and the generated welding slag is easy to clog the liquid injection tank; the circular aluminum two-phase phase change heat spreader produced can maintain dynamic balance during high-speed rotation. Compared with existing copper or stainless steel materials, it better meets the requirements for heat spreaders under high-speed rotation conditions, has a lower price and lower weight, and meets the needs of heat spreaders that are more sensitive to weight requirements.

[0037] It should be understood by those skilled in the art that the above embodiments are merely for the purpose of illustrating the present invention clearly, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above invention, and these changes or modifications are still within the scope of the present invention.

Claims

1. A circular aluminum dual-phase phase change temperature plate, characterized by: The heat evaporating plate comprises a body, wherein the body comprises an upper body and a lower body that match each other, a first capillary structure is etched on the inner wall of the upper body, and a second capillary structure is etched on the inner wall of the lower body, the first capillary structure and the second capillary structure are communicated, and the upper body and the lower body cooperate to form an evaporation chamber, in which a working medium is provided; The heat evaporating plate body is configured to be annular, a first through hole is provided at the center of the heat evaporating plate body, and the center of gravity of the heat evaporating plate body coincides with the geometric center of the first through hole.

2. The circular aluminum dual-phase phase change temperature plate according to claim 1, characterized in that: A first protrusion is provided at the center hole of the lower body, a first groove is provided on the first protrusion, and a liquid injection groove is provided on the lower body. One end of the liquid injection groove is communicated with the first groove, and the other end is communicated with the evaporation cavity. The evaporation cavity, the liquid injection groove and the first groove form a closed cavity.

3. The circular aluminum dual-phase phase change temperature plate according to claim 1, characterized in that: The lower body is provided with a main flow channel, the upper body is provided with a secondary flow channel, and the evaporation cavity, the main flow channel and the secondary flow channel are communicated with each other.

4. The circular aluminum dual-phase phase change temperature plate according to claim 3, characterized in that: The lower body is provided with a second protrusion, and the upper body is provided with a second groove. The second protrusion is located below the second groove, and the secondary flow channel is formed between the second protrusion and the second groove. The secondary flow channel divides the main flow channel into a first main flow channel and a second main flow channel. The evaporation chamber, the first main flow channel, the secondary flow channel, and the second main flow channel are connected in sequence.

5. The circular aluminum dual-phase phase change temperature plate according to claim 1, characterized in that: The temperature equalizing plate body also includes a plurality of guide columns evenly distributed circumferentially, and the two ends of the guide columns are respectively vertically connected to the upper body and the lower body; a third capillary structure is etched on the outer surface of the guide column, and the third capillary structure is connected to the adjacent first capillary structure and the second capillary structure; the lower body is provided with a plurality of support columns, and the two ends of the support columns are respectively vertically connected to the upper body and the lower body.

6. The circular aluminum dual-phase phase change temperature plate according to claim 1, characterized in that: In the working state, the rotation speed of the temperature equalizing plate body is 2000-4000 rpm, the diameter of the first through hole is greater than the length of the liquid injection groove; the first protrusion is provided with a liquid injection port, and the liquid injection port is perpendicular to and connected to the first groove; the liquid injection groove has one of the following structures: a trapezoidal cross-section, a rectangular cross-section, a circular cross-section, a semicircular cross-section or an elliptical cross-section.

7. A method for manufacturing a circular aluminum dual-phase phase change temperature plate, characterized by: The following steps are involved: S1. Fabricating an upper body blank and a lower body blank. Both the upper body blank and the lower body blank have a square cross-sectional structure. The upper body blank is provided with an upper trough body, and the lower body blank is provided with a lower trough body that cooperates with the upper trough body. The upper and lower trough bodies are arranged in a circular shape. A first through hole is provided at the center of the upper and lower trough bodies. The center of gravity of the upper and lower body blanks coincides with the geometric center of the first through hole. S2, etching the first capillary structure and the second capillary structure, etching the first capillary structure on the upper trough body and etching the second capillary structure on the lower trough body; S3, making a liquid injection groove, punching a liquid injection groove on the lower body blank; setting a first protrusion at the center hole of the lower body blank, and a first groove on the first protrusion, one end of the liquid injection groove is connected to the first groove, and a liquid injection port is provided on the first protrusion, and the liquid injection port and the first groove are perpendicular to each other and connected. S4, welding preparation, placing the carbon rod into the first groove; S5, welding the upper body blank and the lower body blank, and sealing the upper body blank and the lower body blank by first aluminum brazing, forming an evaporation chamber after welding. During the first aluminum brazing sealing process, the carbon rod is carbonized into carbon slag, and the first capillary structure and the second capillary structure in step S3 are provided on the inner wall of the evaporation chamber; S6, removing the carbon residue, clearing the carbon residue in the first groove, and sealing the end opening of the first groove; S7, helium side leakage check, flush helium into the liquid injection tank and evaporation chamber through the liquid injection port to detect whether there is side leakage. If there is side leakage, treat the side leakage. If there is no side leakage, the helium inspection is completed; S8, liquid medium injection and vacuuming, injecting liquid medium into the evaporation cavity through the liquid injection port, then vacuuming the evaporation cavity, performing a second aluminum brazing seal on the liquid injection port to keep the evaporation cavity and the liquid injection tank sealed, and obtaining a temperature-uniform plate blank, S9, machining the temperature-averaging plate blank, milling off the upper body blank to the edge of the upper body, milling off the lower body blank to the edge of the lower body, obtaining a circular temperature-averaging plate body, and making the gravity center of the temperature-averaging plate body coincide with the geometric center of the first through hole, obtaining a circular aluminum two-phase phase change temperature-averaging plate.

8. The method for manufacturing a circular aluminum dual-phase phase change temperature equalizing plate according to claim 7, characterized in that: The following steps are also included: S21, constructing the secondary flow channel, providing a second groove on the upper body, and providing a second protrusion on the lower body, wherein the second protrusion is located below the second groove, and the secondary flow channel is formed between the second protrusion and the second groove; S91, before machining the temperature-averaged plate blank, milling off the first protrusion; The first aluminum brazing seal in S5 is performed by diffusion welding, with the solder treated with a deoxidizing agent, a welding temperature of 600-650° C., a welding time of 6-9 hours, and a welding pressure of 20-40 MPa; The second aluminum brazing seal in S9 is performed in a gas-protected atmosphere furnace, using solder at a temperature of 550-650°C and a welding time of 2-3.5 hours; The circular aluminum dual-phase phase change temperature averaging plate is made of pure aluminum or aluminum alloy; The solder includes 10-15% aluminum and 0.2-0.8% silicon, where the percentages are by mass.

9. The method for manufacturing a circular aluminum dual-phase phase change temperature plate according to claim 7, characterized in that: The carbon rod contains 35-65% carbon by mass and is a straight rod that matches the first groove. Alternatively, the carbon rod includes a baffle, a metal wire perpendicular to the baffle, and a plurality of carbon blocks connected in sequence, wherein a second through hole cooperating with the metal wire is provided at the center of the carbon block, a third groove is provided at one end of the carbon block, and a third protrusion is provided at the other end.

10. A circular aluminum radiator, characterized by: It comprises a temperature averaging plate and a heat dissipation plate, wherein the temperature averaging plate is the circular aluminum dual-phase phase change temperature averaging plate as described in any one of claims 1-6.

Images