Anti-gravity heat pipe with aluminum alloy shell and continuous manufacturing method and continuous manufacturing device of anti-gravity heat pipe

Abstract

The invention discloses a continuous manufacturing method of an anti-gravity heat pipe with an aluminum alloy shell, which comprises the following steps of: continuously extruding an aluminum alloy rod material in a tangential manner, increasing the temperature to the extrusion temperature required by aluminum alloy under the action of friction extrusion force, and extruding after an aluminum alloy round rod enters an extrusion wheel, the extrusion shoe and the die are combined for extrusion forming, and the aluminum alloy pipe can be discharged together with the liquid absorption core placed in the die in advance during discharging; before entering an extrusion die, the wick is mixed with a working medium to achieve extrusion on-line filling, after discharging, the aluminum alloy heat pipe reaching the needed length is cut off and sealed, and then the anti-gravity heat pipe can be produced. According to the manufacturing method, continuous mass production of the aluminum alloy anti-gravity heat pipe can be achieved, and the manufacturing method is low in cost and capable of achieving industrialization.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy anti-gravity heat pipe products, manufacturing methods and continuous extrusion equipment and technology, and in particular to an aluminum alloy shell anti-gravity heat pipe and a continuous manufacturing method and continuous manufacturing device thereof. Background Art

[0002] At present, heat pipes are a kind of high-efficiency heat transfer element in the field of heat exchange. The field of heat pipes can be mainly divided into core heat pipes, gravity heat pipes, gravity-assisted heat pipes, rotary heat pipes, electrohydrodynamic heat pipes, magnetohydrodynamic heat pipes, permeation heat pipes, etc. according to the flow dynamics of the working fluid. Heat pipes use the principle of heat conduction and the rapid heat transfer properties of medium phase change to quickly transfer heat to outside the heat source through heat pipes. Phase change medium heat transfer is a heat transfer method that uses the absorption and release of heat when the form of the working fluid changes; it uses the principle of absorbing heat when the liquid vaporizes and releasing heat when the gas condenses. Phase change heat transfer, as a latent heat exchange process, not only has high heat transfer intensity, but also high heat transfer efficiency. The heat transfer rate can be several orders of magnitude greater than the heat conduction of general solid materials. The gravity heat pipe mainly has the evaporation end at the bottom and the condensation end at the top, using 45 0 ~90 0 The working fluid flows back to the evaporation end through gravity to achieve circulation. This structure of heat pipe limits the location of the evaporation end and the condensation end. A heat pipe that allows the working fluid to overcome gravity and flow upward through capillary force, so that the heat-conducting element can achieve high-performance heat transfer under the conditions of heating at the top and cooling at the bottom, is called an anti-gravity heat pipe. An anti-gravity heat pipe uses a liquid wick with a capillary structure to overcome the influence of gravity through capillary force, and can achieve the location of the evaporation end and the condensation end at any position, which can simplify the structural design of the heat exchange system. The current anti-gravity heat pipe technology can achieve a heat pipe with the heating section at the top and the cooling section at the bottom. The capillary force and structure of the liquid wick are the key to the heat transfer efficiency of the anti-gravity heat pipe.

[0003] However, in the prior art, there are still some other problems in the structure, manufacturing method and use effect of the anti-gravity heat pipe that need to be improved, as follows: (1) There are two main methods for manufacturing anti-gravity heat pipes. One is to seal one side of the ordinary pipe and then add the liquid absorbent core and the working fluid, and then seal it; the other is to extrude a special-shaped vacuum tube, then reduce the width of the inner groove of the special-shaped tube by drawing, and then fill the working fluid. The filling method is similar to the first operation. Both of the above methods have the problems of long production process time and many process steps, and low production efficiency. (2) The liquid absorbent core used in the above prior art needs to be sintered in a conventional way. The liquid absorbent core is sintered from copper powder or aluminum powder. In the process of sintering the liquid absorbent core, its energy consumption is high, the material cost and production cost are high, the process is complicated, and aluminum is difficult to sinter due to its low melting point. (3) The existing manufacturing method of anti-gravity heat pipes and the sintering method of liquid wicks cannot achieve continuous production of anti-gravity heat pipes. For example, anti-gravity heat pipes can be filled with one end before filling the other end, but liquid wicks can only be sintered with one end before sintering the other end, resulting in low production efficiency. In addition, they can generally only produce products of a set length, and cannot produce products of any length, which has certain limitations.

[0004] Therefore, it is necessary to make certain improvements to the existing anti-gravity heat pipe structure, production method and equipment to improve the problems of the prior art. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an aluminum alloy shell anti-gravity heat pipe and a continuous manufacturing method and a continuous manufacturing device thereof. The continuous manufacturing method of the aluminum alloy shell anti-gravity heat pipe adopts tangential continuous extrusion of the aluminum alloy rod material, and raises the temperature to the extrusion temperature required by the aluminum alloy under the action of friction extrusion force. After the aluminum alloy round rod enters the extrusion wheel, it is extruded and formed by combining the extrusion boot with the mold. When the aluminum alloy tube is discharged, it will be discharged together with the liquid wick placed in the mold in advance; before the liquid wick enters the extrusion die, it is mixed with the working fluid to realize extrusion online filling. After the discharge, the aluminum alloy heat pipe that reaches the required length is cut and sealed to produce the anti-gravity heat pipe. This invention can realize the continuous mass production of aluminum alloy anti-gravity heat pipes, and is a low-cost manufacturing method that can be industrialized.

[0006] The technical solution adopted by the present invention to solve the technical problem is: an aluminum alloy shell anti-gravity heat pipe, comprising an aluminum alloy shell and a liquid wick arranged on the inner surface of the aluminum alloy shell, an inner hole and a plurality of reflux channels connected to the inner hole are built into the liquid wick, the inner hole diameter of the liquid wick is larger than the reflux channel diameter, and the cross section of the inner hole is located at the center of the reflux channel. This structural design enables the working fluid to still move upward in the anti-gravity state, and can realize the reflux of the anti-gravity working fluid.

[0007] In addition, the present invention also relates to a continuous manufacturing method of an aluminum alloy shell anti-gravity heat pipe, comprising the following steps:

[0008] (1) Material selection: Select aluminum alloy round rods made of aluminum alloy raw materials, high temperature resistant capillary structure fiber materials and working fluid immersion liquid;

[0009] (2) Material preparation: straighten and brush the aluminum alloy round rod; soak the capillary structure fiber material in the working medium, and after soaking, load the capillary structure fiber material into the extrusion die;

[0010] (3) Extrusion: A continuous extrusion method is used to make the aluminum alloy round rod enter the continuous extruder, and it is extruded into the structure of the aluminum alloy shell through an extrusion die; the capillary structure fiber material is used as the liquid absorption core of the anti-gravity heat pipe and is placed in the mold core in advance. After the aluminum alloy shell is formed by the die, the aluminum alloy shell pulls the liquid absorption core during the discharging process and discharges the material at the same time, forming a capillary structure fiber material and a working fluid that are mixed and filled into the aluminum alloy shell online for extrusion and discharging at the same time, thereby realizing the online filling of the working fluid of the anti-gravity aluminum alloy heat pipe; the extrusion process has low production cost and short process flow, and improves production efficiency;

[0011] (4) Heading: The anti-gravity aluminum alloy heat pipe of any length extruded above is headed once, so that the extruded anti-gravity aluminum alloy heat pipe can form a vacuum; then it is cooled in a cooling water tank, and the outer dimensions of the anti-gravity aluminum alloy heat pipe can be changed by pulling and drawing; when the extruded anti-gravity aluminum alloy heat pipe reaches the required length, it is cut and the tail is headed to a fixed length, so as to obtain a finished anti-gravity aluminum alloy heat pipe that can be continuously produced and has a head structure at both ends.

[0012] Furthermore, the power of the extrusion process of the continuous extrusion method used in step (3) is provided by the friction of the rotating extrusion wheel on the blank. The continuous extrusion method used is also called the Conclad method. The power of the extrusion process is provided by the friction of the rotating extrusion wheel on the blank. Its operating stroke is unlimited. This feature ensures the continuity of production and greatly improves the production efficiency.

[0013] Furthermore, the extrusion temperature required for continuous extrusion in step (3) is 0.7 to 0.85 times the melting point of the aluminum alloy round rod; the ratio of the cross-sectional area of ​​the die cavity to the cross-sectional area of ​​the product during the continuous extrusion process is 10 to 4.18; the rotation speed of the extrusion wheel during the continuous extrusion process is 1 r / min to 30 r / min. Of course, the extrusion speed is different depending on the extrusion material. The ratio of the cross-sectional area of ​​the die cavity to the cross-sectional area of ​​the product is sometimes as high as about 400, preferably 4.18.

[0014] Furthermore, the head sealing in the step (4) is performed using a pressure head sealing device or a spinning head sealing device. Both the pressure head sealing device and the spinning head sealing device can move according to the discharge speed. During the movement, the pressure head sealing device or the spinning head sealing device performs head sealing on the anti-gravity aluminum alloy heat pipe, and can return to the initial position after completion. The length of the head position of the anti-gravity aluminum alloy heat pipe is 20mm to 50mm; the head sealing working time of the spinning head sealing device is 5 to 20s, the rotation speed during spinning is 400r / min to 1000r / min, and the pressure during spinning head sealing is 2KN to 30KN; the head sealing working time of the pressure head sealing device is 5 to 20s, and the pressure during pressure head sealing is 10KN to 200KN.

[0015] Furthermore, the volume of the working fluid accounts for 5% to 10% of the inner volume of the anti-gravity aluminum alloy heat pipe; the working fluid can be helium, R21, R11, R113, methane, ammonia, methanol, ethanol, or a mixture of several of them.

[0016] Furthermore, the traction drawing in step (4) is an online drawing method, and a traction mechanism is used to make the anti-gravity aluminum alloy heat pipe pass through the drawing mechanism to obtain an anti-gravity aluminum alloy heat pipe product with a smaller cross-section. The drawing cross-section reduction rate during the online drawing process is controlled at 5% to 40%.

[0017] Furthermore, the liquid-absorbing core part of the capillary structure fiber material in the step (3) is pre-placed in the core of the extrusion mold, and the remaining part is left outside the extrusion mold; the part of the capillary structure fiber material placed outside the extrusion mold is wrapped by a high-temperature resistant protective film, so that the working fluid soaked in the capillary structure fiber material will not leak outside the extrusion mold under a high-temperature environment; the high-temperature resistant protective film uses PET high-temperature protective film, soft polymer high-temperature protective film, and PPE high-temperature protective film.

[0018] Furthermore, the capillary structure fiber material is composed of a fiber material with a capillary structure; the fiber material is a high temperature resistant composite fiber capillary structure material, which is a multi-layer structure of a twisted shape formed by metal wires of different wire diameters, and its inner layer woven mesh line forms a composite fiber capillary structure. The capillary structure fiber material in the present invention uses a high temperature resistant composite fiber material, which is filled with the working fluid online, and the production of the anti-gravity aluminum alloy heat pipe is completed in one time by extrusion. From the existing research results, the wick (capillary structure fiber material) can generally be divided into two categories: a single structure wick and a composite structure wick. Among them, the single structure wick includes a winding wire mesh core, a metal sintering core, an axial groove core, a ring core, a crescent core, a trunk core, etc.; the composite structure wick includes a wire mesh composite core, a wire mesh covered groove core, a plate-type trunk core and a tunnel core, etc. The current wick manufacturing methods include mechanical processing, sintering, metal winding wire, metal porous foaming and other methods. The mechanically processed micro-groove wick has poor anti-gravity performance and high cost; the metal winding wire wick has a complex structure and process and high cost; the most commonly used is the sintered wick, which is made of copper powder or aluminum powder, with high material cost, complex process and difficult to sinter due to its low melting point. The wick used in the present invention adopts a capillary structure fiber material, which is mixed with the working fluid and extruded to form an anti-gravity heat pipe in one step, saving production costs and shortening the production process. It is a brand-new manufacturing method.

[0019] Finally, the present invention also relates to a continuous manufacturing device for an aluminum alloy shell anti-gravity heat pipe, comprising a straightening machine, a brush rod machine, a working fluid immersion tank, a continuous extruder, a head capping device, a cooling device, a drawing device, a tail capping device and a cutting machine which are arranged in sequence.

[0020] The continuous extruder comprises an extrusion wheel arranged at the bottom, an extrusion shoe arranged at the top, a mold cavity arranged in the extrusion, an extrusion mold arranged in the mold cavity and a mold core arranged in the extrusion mold, and a mold shoe arranged at one side of the bottom of the extrusion shoe and located between the extrusion shoe and the extrusion wheel; a hydraulic drive device is arranged on the top of the extrusion shoe.

[0021] The bottom of the mold cavity is provided with an inwardly sunken arc concave surface, the middle position of the mold cavity is provided with an extrusion channel for installing the extrusion mold and the mold core, and the arc concave surface is provided with an aluminum alloy round rod extrusion entry channel which is connected with the extrusion channel.

[0022] The aluminum alloy round rod is heated to the required extrusion temperature and enters the bottom side of the extrusion shoe along the circular surface of the extrusion wheel. Under the extrusion force of the extrusion wheel and the extrusion shoe, the aluminum alloy round rod is extruded from the aluminum alloy round rod into the channel and into the extrusion die, and is extruded together with the capillary structure fiber material and the working fluid placed in the mold core. During extrusion, the capillary structure fiber material and the working fluid are filled online into the extruded aluminum alloy shell to form an anti-gravity aluminum alloy heat pipe extrusion, and then enters the head sealing process.

[0023] The aluminum alloy shell and capillary structure fiber material can be continuously extruded to produce products of any length. Anti-gravity aluminum alloy heat pipes of different specifications can be produced by simply replacing the mold and adjusting the parameters.

[0024] In summary, the continuous manufacturing method of the aluminum alloy shell anti-gravity heat pipe of the present invention has fewer process flows and is simple to operate; compared with the existing manufacturing methods, the continuous manufacturing method only needs to perform a small amount of processing on the aluminum alloy round rod and the capillary structure fiber material, and can be extruded into a whole by continuous extrusion; and the filling of the phase change material of the anti-gravity heat pipe can also be carried out during the extrusion process, which greatly shortens the production process compared with other existing technical solutions, saves production costs, and improves production efficiency. The continuous manufacturing method has the following beneficial effects:

[0025] (1) High production efficiency: It can be continuously rolled into large quantities for mass production. Through continuous extrusion, uninterrupted extrusion production can be carried out to produce products of any length;

[0026] (2) Save energy and reduce costs: Compared with other production technologies, this continuous manufacturing method significantly reduces energy consumption, and compared with the most commonly used wick sintering method, the material cost and production cost are greatly reduced;

[0027] (3) High material utilization rate: This continuous manufacturing method can achieve continuous production, and the material utilization rate can reach more than 95%.

[0028] In addition, the continuous manufacturing method of the aluminum alloy shell anti-gravity heat pipe is a groundbreaking new method. The method of forming the aluminum alloy raw material round rod and the capillary structure fiber material through continuous extrusion is significantly different from the existing method described in the background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a longitudinal cross-sectional view of an aluminum alloy shell anti-gravity heat pipe of the present invention;

[0030] Figure 2 It is a cross-sectional view of an aluminum alloy shell anti-gravity heat pipe of the present invention;

[0031] Figure 3 is a cross-sectional view of the aluminum alloy housing of the present invention;

[0032] Figure 4 It is a simplified process flow diagram of a continuous manufacturing method of an aluminum alloy shell anti-gravity heat pipe of the present invention;

[0033] Figure 5 It is a schematic structural diagram of a continuous manufacturing device for an aluminum alloy shell anti-gravity heat pipe of the present invention;

[0034] Figure 6 It is a simplified structural diagram of the continuous extruder of the present invention;

[0035] Figure 7 It is a schematic cross-sectional view of the structure of the mold cavity;

[0036] The numbers in the accompanying drawings are as follows: 1, aluminum alloy shell; 2, liquid absorption core; 3, return channel; 4, straightening machine; 5, brush rod machine; 6, working medium immersion tank; 7, continuous extruder; 8, head head sealing device; 9, cooling device; 10, pulling device; 11, tail head sealing device; 12, cutting machine; 13, extrusion wheel; 14, extrusion boot; 15, mold cavity; 16, extrusion mold; 17, mold core; 18, mold boot; 19, arc concave surface; 20, extrusion channel; 21, aluminum alloy round rod; 22, capillary structure fiber material; 23, high temperature resistant protective film; 24, aluminum alloy round rod extrusion into the channel. DETAILED DESCRIPTION

[0037] Example 1

[0038] like Figure 1 , Figure 2 , Figure 3 As shown, an aluminum alloy shell anti-gravity heat pipe described in this embodiment 1 includes an aluminum alloy shell 1 and a liquid wick 2 arranged on the inner surface of the aluminum alloy shell, an inner hole and eight reflux channels 3 connected to the inner hole are built into the liquid wick, the inner hole diameter of the liquid wick is larger than the reflux channel diameter, and the cross section of the inner hole is located at the center of the reflux channel. This structural design enables the working fluid to move upward under the anti-gravity state, and the reflux of the anti-gravity working fluid can be achieved. The cross-sectional shape of the micro-groove of the tube core of the anti-gravity aluminum alloy heat pipe described in this embodiment 1 is a sunflower shape. The appearance cross-section of the anti-gravity aluminum alloy heat pipe is circular.

[0039] In addition, this embodiment 1 also describes a continuous manufacturing method of an aluminum alloy shell anti-gravity heat pipe, such as Figure 4 , Figure 5 and Figure 6 As shown, the following steps are included:

[0040] (1) Material selection: Selecting aluminum alloy round rod 21 made of aluminum alloy raw material, high temperature resistant capillary structure fiber material 22 and working fluid soaking liquid;

[0041] (2) Material preparation: straighten and brush the aluminum alloy round rod; soak the capillary structure fiber material in the working medium, and after soaking, load the capillary structure fiber material into the extrusion die;

[0042] (3) Extrusion: A continuous extrusion method is used to make the aluminum alloy round rod enter the continuous extruder, and it is extruded into the structure of the aluminum alloy shell through an extrusion die; the capillary structure fiber material is used as the liquid absorption core of the anti-gravity heat pipe and is placed in the mold core in advance. After the aluminum alloy shell is formed by the die, the aluminum alloy shell pulls the liquid absorption core during the discharging process and discharges the material at the same time, forming a capillary structure fiber material and a working fluid that are mixed and filled into the aluminum alloy shell online for extrusion and discharging at the same time, thereby realizing the online filling of the working fluid of the anti-gravity aluminum alloy heat pipe; the extrusion process has low production cost and short process flow, and improves production efficiency;

[0043] (4) Heading: The anti-gravity aluminum alloy heat pipe of any length extruded above is headed once, so that the extruded anti-gravity aluminum alloy heat pipe can form a vacuum; then it is cooled in a cooling water tank, and the outer dimensions of the anti-gravity aluminum alloy heat pipe can be changed by pulling and drawing; when the extruded anti-gravity aluminum alloy heat pipe reaches the required length, it is cut and the tail is headed to a fixed length, so as to obtain a finished anti-gravity aluminum alloy heat pipe that can be continuously produced and has a head structure at both ends.

[0044] In this embodiment 1, the extrusion process power of the continuous extrusion method used in step (3) is provided by the friction of the rotating extrusion wheel on the blank. The continuous extrusion method used is also called the Conclad method. The power of the extrusion process is provided by the friction of the rotating extrusion wheel on the blank. Its operating stroke is unlimited. This feature ensures the continuity of production and greatly improves the production efficiency.

[0045] In the present embodiment 1, the extrusion temperature required for continuous extrusion in step (3) is 0.7 to 0.85 times the melting point of the aluminum alloy round rod; the ratio of the cross-sectional area of ​​the die cavity to the cross-sectional area of ​​the product during the continuous extrusion process is 10 to 4.18; the rotation speed of the extrusion wheel during the continuous extrusion process is 1 r / min to 30 r / min. Of course, the extrusion speed is different depending on the extrusion material. The ratio of the cross-sectional area of ​​the die cavity to the cross-sectional area of ​​the product is sometimes as high as about 400, preferably 4.18.

[0046] In this embodiment 1, the head sealing in the step (4) is performed using a pressure head sealing device or a spinning head sealing device. Both the pressure head sealing device and the spinning head sealing device can move according to the discharge speed. During the movement, the pressure head sealing device or the spinning head sealing device performs head sealing on the anti-gravity aluminum alloy heat pipe, and can return to the initial position after completion; the length of the head sealing position of the anti-gravity aluminum alloy heat pipe is 20mm~50mm; the head sealing working time of the spinning head sealing device is 5~20s, the rotation speed during spinning is 400r / min~1000r / min, and the pressure during spinning head sealing is 2KN~30KN; the head sealing working time of the pressure head sealing device is 5~20s, and the pressure during pressure head sealing is 10KN~200KN.

[0047] In this embodiment 1, the volume of the working fluid accounts for 5% to 10% of the inner volume of the anti-gravity aluminum alloy heat pipe; the working fluid can be helium, R21, R11, R113, methane, ammonia, methanol, ethanol, or a mixture of several of them.

[0048] In this embodiment 1, the traction drawing in the step (4) is an online drawing method, and a traction mechanism is used to make the anti-gravity aluminum alloy heat pipe pass through the drawing mechanism to obtain an anti-gravity aluminum alloy heat pipe product with a smaller cross-section. The drawing cross-section reduction rate during the online drawing process is controlled at 5% to 40%.

[0049] In this embodiment 1, the liquid-absorbing core part of the capillary structure fiber material in the step (3) is pre-placed in the core of the extrusion mold, and the remaining part is left outside the extrusion mold; the part of the capillary structure fiber material placed outside the extrusion mold is wrapped by a high-temperature resistant protective film 23, so that the working fluid soaked in the capillary structure fiber material will not leak outside the extrusion mold under a high-temperature environment; the high-temperature resistant protective film uses PET high-temperature protective film, soft polymer high-temperature protective film, and PPE high-temperature protective film.

[0050] In the present embodiment 1, the capillary structure fiber material is composed of a fiber material with a capillary structure; the fiber material is a high temperature resistant composite fiber capillary structure material, which is a multi-layer structure of a twisted shape formed by metal wires of different wire diameters, and its inner layer woven mesh line forms a composite fiber capillary structure. The capillary structure fiber material in the present invention uses a high temperature resistant composite fiber material, which is filled with the working fluid online, and the production of the anti-gravity aluminum alloy heat pipe is completed in one time by extrusion. From the existing research results, the liquid absorbent core (capillary structure fiber material) can generally be divided into two categories: a single structure liquid absorbent core and a composite structure liquid absorbent core. Among them, the single structure liquid absorbent core includes a winding wire mesh core, a metal sintering core, an axial groove core, a ring core, a crescent core, a trunk core, etc.; the composite structure liquid absorbent core includes a wire mesh composite core, a wire mesh covered groove core, a plate-type trunk core and a tunnel core, etc. The current liquid absorbent core manufacturing methods include mechanical processing, sintering, metal winding wire, metal porous foaming and other methods. The mechanically processed micro-groove wick has poor anti-gravity performance and high cost; the metal winding wire wick has a complex structure and process and high cost; the most commonly used is the sintered wick, which is made of copper powder or aluminum powder, with high material cost, complex process and difficult to sinter due to its low melting point. The wick used in the present invention adopts a capillary structure fiber material, which is mixed with the working fluid and extruded to form an anti-gravity heat pipe in one step, saving production costs and shortening the production process. It is a brand-new manufacturing method.

[0051] Finally, this embodiment 1 also describes a continuous manufacturing device for an aluminum alloy shell anti-gravity heat pipe, such as Figure 5As shown, it includes a straightening machine 4, a brushing machine 5, a working fluid immersion tank 6, a continuous extruder 7, a head end capping device 8, a cooling device 9, a drawing device 10, a tail end capping device 11 and a cutting machine 12 which are arranged in sequence. The straightening machine, the brushing machine, the working fluid immersion tank, the head end capping device, the cooling device, the drawing device, the tail end capping device and the cutting machine are all equipment devices well known to ordinary technicians, and the structure and principle of these equipments will not be further described again. However, there is no technology that uses the above-mentioned equipment devices to form a continuous production of aluminum alloy shell anti-gravity heat pipes and realizes the online filling and injection of capillary structure fiber materials into the aluminum alloy shell to form an integrated continuous extrusion molding. These equipment combinations and applications are new structural solutions.

[0052] like Figure 6 As shown, the continuous extruder comprises an extrusion wheel 13 disposed at the bottom, an extrusion shoe 14 disposed at the top, a die cavity 15 disposed in the extrusion, an extrusion die 16 disposed in the die cavity, a die core 17 disposed in the extrusion die, and a die shoe 18 disposed at one side of the bottom of the extrusion shoe and located between the extrusion shoe and the extrusion wheel; a hydraulic drive device (not shown in the figure) is disposed at the top of the extrusion shoe. The hydraulic drive device can adopt commonly used drive elements such as hydraulic presses and hydraulic cylinders.

[0053] like Figure 7 As shown, the bottom of the mold cavity is provided with an inwardly recessed arc concave surface 19, the middle position of the mold cavity is provided with an extrusion channel 20 for installing the extrusion mold and the mold core, and the arc concave surface is provided with an aluminum alloy round rod extrusion entry channel 24 which is connected to the extrusion channel.

[0054] The aluminum alloy round rod is heated to the required extrusion temperature and enters the bottom side of the extrusion shoe along the circular surface of the extrusion wheel. Under the extrusion force of the extrusion wheel and the extrusion shoe, the aluminum alloy round rod is extruded from the aluminum alloy round rod into the channel and into the extrusion die, and is extruded together with the capillary structure fiber material and the working fluid placed in the mold core. During extrusion, the capillary structure fiber material and the working fluid are filled online into the extruded aluminum alloy shell to form an anti-gravity aluminum alloy heat pipe extrusion, and then enters the head sealing process.

[0055] Example 2

[0056] The aluminum alloy shell anti-gravity heat pipe structure and the continuous manufacturing device of the aluminum alloy shell anti-gravity heat pipe of this embodiment 2 are basically the same as those described in embodiment 1, except that the connection manufacturing method of the aluminum alloy shell anti-gravity heat pipe is different, as follows:

[0057] The connection manufacturing method of the aluminum alloy shell anti-gravity heat pipe described in this embodiment 2 specifically includes the following steps:

[0058] (1) Material selection: Al is selected as the raw material for heat pipes;

[0059] (2) Extrusion: The tangential continuous extrusion method is adopted. After being straightened and brushed, the heat pipe raw materials are sent into the tangential continuous extruder and then enter the mold in the mold cavity. Under the action of pressure and friction, they are combined with the fiber material liquid absorbent core placed in the mold in advance, and are extruded through the mold to complete the extrusion process. At this time, the extrusion temperature is 500℃.

[0060] (3) Online filling: During the continuous extrusion process, the extruded material drives the capillary structure wick to move, so that the wick soaked in the working fluid in advance can be continuously pulled into the mold outside the extruder to combine with Al, so that the extruded aluminum alloy heat pipe contains the capillary structure wick and its working fluid.

[0061] (4) First head sealing: After the metal tube is extruded out of the die, a spinning head sealing device is immediately used to seal one end of the metal tube, so that the end of the head becomes a solid body, forming a pollution-free inner vacuum tube; at this time, the length of the head seal mark is 25 mm, the moving speed of the metal tube is 70 m / min, the temperature is 460 ° C, the action time of the head sealing device is 5 s, the speed of the spinning head is 1000 r / min, and the spinning head pressure is 25 MPa;

[0062] (5) Cooling: The metal pipe enters the cooling device for cooling treatment. The length of the cooling water tank is 2m and the water temperature is 50℃. After that, there is air cooling treatment. The length of the air cooling channel is 1m. After cooling, the temperature of the metal pipe is 25℃.

[0063] (6) Drawing: The metal tube is pulled to the drawing device by a traction machine. The drawing device is equipped with a drawing die of a fixed size. The metal tube is drawn online through the die. The minimum width of the micro groove on the inner wall of the metal tube before drawing is 0.3mm, and the minimum width of the micro groove after drawing is 0.1mm. The cross-sectional reduction rate of drawing is 10%;

[0064] (7) Fixed-length sealing: When the extruded tube reaches a certain length, a spinning sealing device is used to seal the other end of the metal tube, so that the sealing part becomes a solid body, and a continuous internal vacuum tube with both ends sealed is obtained; at this time, the length of the sealing mark is 50 mm, the moving speed of the metal tube is 70 m / min, the temperature is 25 °C, the action time of the sealing device is 5 s, the spinning sealing speed is 1000 r / min, and the spinning sealing pressure is 150 MPa.

[0065] (8) Cutting: Use a cutting device to cut the pipe in the middle of the head mark in sequence. The metal pipe obtained by cutting is the required aluminum alloy anti-gravity heat pipe.

[0066] The working fluid described in this embodiment 2 is: Freon.

[0067] In the continuous manufacturing device of the aluminum alloy shell anti-gravity heat pipe of the present embodiment 2, the extrusion die is installed in the die cavity, the die cavity is installed in the extrusion shoe, and the extrusion shoe cooperates with the extrusion wheel through a hydraulic device.

[0068] The above is only a preferred embodiment of the present invention, and does not limit the structure of the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An anti-gravity heat pipe with aluminum alloy shell, It is characterized in that The invention comprises an aluminum alloy shell and a liquid absorbent core arranged on the inner surface of the aluminum alloy shell. The liquid absorbent core is provided with an inner hole and several reflux channels connected with the inner hole. The inner hole of the liquid absorbent core has a larger diameter than the reflux channel, and the cross section of the inner hole is located at the center of the reflux channel.

2. A continuous manufacturing method for an aluminum alloy shell anti-gravity heat pipe, It is characterized in that The following steps are involved: (1) Material selection: Select aluminum alloy round rods made of aluminum alloy raw materials, high temperature resistant capillary structure fiber materials and working fluid immersion liquid; (2) Material preparation: straighten and brush the aluminum alloy round rod; soak the capillary structure fiber material in the working medium, and after soaking, load the capillary structure fiber material into the extrusion die; (3) Extrusion: The aluminum alloy round rod is fed into a continuous extruder by a continuous extrusion method, and is extruded into an aluminum alloy shell structure by an extrusion die; the capillary structure fiber material is placed in the mold core in advance as the liquid absorption core of the anti-gravity heat pipe. After the aluminum alloy shell is formed by the die, the aluminum alloy shell pulls the liquid absorption core during the discharging process and is discharged at the same time, so that the capillary structure fiber material is mixed with the working fluid and is online filled into the aluminum alloy shell for extrusion and discharge at the same time, thereby realizing the online filling of the working fluid of the anti-gravity aluminum alloy heat pipe; (4) Heading: The anti-gravity aluminum alloy heat pipe of any length extruded above is headed once, so that the extruded anti-gravity aluminum alloy heat pipe can form a vacuum; then it is cooled in a cooling water tank, and the outer dimensions of the anti-gravity aluminum alloy heat pipe can be changed by pulling and drawing; when the extruded anti-gravity aluminum alloy heat pipe reaches the required length, it is cut and the tail is headed to a fixed length, so as to obtain a finished anti-gravity aluminum alloy heat pipe that can be continuously produced and has a head structure at both ends.

3. The continuous manufacturing method of the aluminum alloy shell anti-gravity heat pipe according to claim 2, It is characterized in that The power of the extrusion process in the continuous extrusion method adopted in the step (3) is provided by the friction of the rotating extrusion wheel on the blank.

4. The continuous manufacturing method of the aluminum alloy shell anti-gravity heat pipe according to claim 3, It is characterized in that The extrusion temperature required for continuous extrusion in the step (3) is 0.7 to 0.85 times the melting point of the aluminum alloy round rod; the ratio of the cross-sectional area of ​​the die cavity to the cross-sectional area of ​​the product during the continuous extrusion process is 10 to 418; and the rotation speed of the extrusion wheel during the continuous extrusion process is 1 r / min to 30 r / min.

5. The continuous manufacturing method of the aluminum alloy shell anti-gravity heat pipe according to claim 4, It is characterized in that The head sealing in the step (4) is performed using a pressure head sealing device or a spinning head sealing device. Both the pressure head sealing device and the spinning head sealing device can move according to the discharge speed. During the movement, the pressure head sealing device or the spinning head sealing device performs head sealing on the anti-gravity aluminum alloy heat pipe, and can return to the initial position after completion. The length of the head sealing position of the anti-gravity aluminum alloy heat pipe is 20mm-50mm; the head sealing working time of the spinning head sealing device is 5-20s, the rotation speed during spinning is 400r / min-1000r / min, and the pressure during spinning head sealing is 2KN-30KN; the head sealing working time of the pressure head sealing device is 5-20s, and the pressure during pressure head sealing is 10KN-200KN.

6. The continuous manufacturing method of the aluminum alloy shell anti-gravity heat pipe according to claim 5, It is characterized in that The volume of the working fluid accounts for 5% to 10% of the inner volume of the anti-gravity aluminum alloy heat pipe; the working fluid can be helium, R21, R11, R113, methane, ammonia, methanol, ethanol, or a mixture of several of them.

7. The continuous manufacturing method of the aluminum alloy shell anti-gravity heat pipe according to claim 6, It is characterized in that The traction drawing in step (4) is an online drawing method, using a traction mechanism to make the anti-gravity aluminum alloy heat pipe pass through the drawing mechanism to obtain an anti-gravity aluminum alloy heat pipe product with a smaller cross-section. The drawing cross-section reduction rate during the online drawing process is controlled at 5% to 40%.

8. The continuous manufacturing method of the aluminum alloy shell anti-gravity heat pipe according to claim 7, It is characterized in that The liquid-absorbing core part of the capillary structure fiber material in the step (3) is pre-placed in the core of the extrusion mold, and the remaining part is left outside the extrusion mold; the part of the capillary structure fiber material placed outside the extrusion mold is wrapped by a high-temperature resistant protective film, so that the working fluid soaked in the capillary structure fiber material will not leak outside the extrusion mold under a high-temperature environment; the high-temperature resistant protective film uses PET high-temperature protective film, soft polymer high-temperature protective film, and PPE high-temperature protective film.

9. The continuous manufacturing method of the aluminum alloy shell anti-gravity heat pipe according to claim 8, It is characterized in that The capillary structure fiber material is composed of fiber material with capillary structure; the fiber material is a high temperature resistant composite fiber capillary structure material, which is a multi-layer structure of metal wires of different wire diameters interwoven into a twisted shape, and the inner layer of the braided mesh line forms a composite fiber capillary structure.

10. A continuous manufacturing device for anti-gravity heat pipes with aluminum alloy shells, It is characterized in that It includes a straightening machine, a brushing machine, a working medium soaking tank, a continuous extruder, a head sealing device, a cooling device, a drawing device, a tail sealing device and a cutting machine which are arranged in sequence; The continuous extruder comprises an extrusion wheel arranged at the bottom, an extrusion shoe arranged at the top, a die cavity arranged in the extrusion, an extrusion die arranged in the die cavity, a die core arranged in the extrusion die, and a die shoe arranged at one side of the bottom of the extrusion shoe and located between the extrusion shoe and the extrusion wheel; a hydraulic drive device is arranged at the top of the extrusion shoe; ——The bottom of the mold cavity is provided with an inwardly sunken arc concave surface, the middle position of the mold cavity is provided with an extrusion channel for installing the extrusion die and the mold core, and the arc concave surface is provided with an aluminum alloy round rod extrusion entry channel that is connected to the extrusion channel; ——The aluminum alloy round rod is heated to the required extrusion temperature and enters the bottom side of the extrusion shoe along the circular surface of the extrusion wheel. Under the extrusion force of the extrusion wheel and the extrusion shoe, the aluminum alloy round rod is extruded from the aluminum alloy round rod into the channel and extruded into the extrusion die, and is extruded together with the capillary structure fiber material and the working fluid placed in the mold core. During extrusion, the capillary structure fiber material and the working fluid are filled online into the extruded aluminum alloy shell to form an anti-gravity aluminum alloy heat pipe extrusion, and then enters the head sealing process.

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