Device for preparing diamond high-thermal-conductivity material powder by pressureless infiltration

Abstract

The present application relates to the field of composite material impregnation equipment, in particular to a diamond high-thermal-conductivity material powder pressureless impregnation preparation equipment, which comprises a horizontal carrier, an impregnation box, a lifting platform and an aluminum liquid tank, a first air outlet and a liquid inlet are arranged on the impregnation box, a second air outlet and an air inlet are arranged on the aluminum liquid tank, a liquid inlet pipe is fixedly connected at the liquid inlet, the liquid inlet pipe comprises a pipe body, a first liquid inlet pipe, a second liquid inlet pipe and a plurality of sealing soft rubber sheets, a convex pipe portion is formed at the lower end of the first liquid inlet pipe, a plurality of first pipes are formed at the upper end of the convex pipe portion, a plurality of second pipes are formed at the lower end of the second liquid inlet pipe, a heating pipe and a liquid delivery pipe are arranged on the top of the aluminum liquid tank. The aluminum liquid tank is vertically lifted by the lifting platform which can vertically lift, the first liquid inlet pipe is lifted by the liquid delivery pipe, the convex pipe portion is connected with the lower end of the second liquid inlet pipe after the convex pipe portion passes through the lower end of the sealing soft rubber sheets, so as to realize the rapid butt joint of the impregnation box and the aluminum liquid tank.

Description

Technical Field

[0001] This invention relates to the field of composite material impregnation equipment, specifically to pressureless impregnation equipment for preparing diamond high thermal conductivity material powder. Background Technology

[0002] Impregnation, also known as immersion, permeation, or penetration, is a microporous (crack) sealing process. A sealing medium (usually a low-viscosity liquid) is introduced into the micropores (cracks) through methods such as natural permeation (i.e., microporous self-absorption), vacuuming, and pressurization, filling the gaps. The sealing medium is then cured by natural (room temperature), cooling, or heating, achieving a seal. Referring to Chinese invention patent CN112281038B, which discloses "an impregnation device and a method for efficiently preparing diamond powder-reinforced metal matrix composites," the impregnation device consists of a melt section, an impregnation section, and a riser pipe; the riser pipe is positioned between the impregnation section and the melt section. It impregnates the preform within the impregnation section by pressurizing the molten metal in the melt section and forcing it into the impregnation section under pressure.

[0003] The impregnation equipment has the following shortcomings: First, because the preform in the impregnation section needs to be vacuumed and kept warm before impregnation, and the inlet for the molten metal to enter the melt section needs to be equipped with a valve that can be opened and closed, the inlet for the molten metal to enter the impregnation section in this impregnation equipment cannot achieve rapid docking between the melt section and the impregnation section, and the docking of the melt section and the impregnation section inevitably requires complicated positioning operations. Second, when the impregnation section of this impregnation equipment is vacuumed and kept warm, the processing efficiency is low if multiple impregnation sections are impregnated. If the impregnation section needs to be vacuumed and kept warm in advance to reduce the preparation time required for impregnation, it is difficult to maintain the sealing of the inlet for the molten metal to enter the impregnation section when docking the impregnation section and the melt section. Therefore, it is necessary to design a new type of impregnation preparation equipment to solve these problems. Summary of the Invention

[0004] Therefore, it is necessary to provide pressureless impregnation equipment for preparing diamond high thermal conductivity material powder to address the existing technical problems.

[0005] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0006] A pressureless impregnation preparation device for diamond high thermal conductivity material powder includes a horizontal platform, a detachable impregnation tank mounted on top of the platform, a vertically movable lifting platform located directly below the platform, and an aluminum liquid tank fixedly mounted on top of the lifting platform. The top of the impregnation tank has a first evacuation port for creating a vacuum inside the tank, and the top of the aluminum liquid tank has a second evacuation port and an inlet port. A liquid inlet is formed at the center of the bottom of the impregnation tank, and a liquid inlet pipe is fixedly connected to the inlet. The liquid inlet pipe includes a hollow cylindrical tube body, a first liquid inlet pipe coaxial with the tube body, a second liquid inlet pipe coaxially fixed to the tube body, and several sealing soft rubber sheets evenly distributed circumferentially and fixed to the bottom of the tube body. The first liquid inlet pipe is elastic. The first liquid inlet is slidably positioned inside the second liquid inlet pipe, which is a hollow tube structure that is wider at the top and narrower at the bottom. The lower ends of the first liquid inlet pipe and the second liquid inlet pipe are dynamically sealed together. The lower end of the first liquid inlet pipe protrudes from top to bottom, forming the second liquid inlet pipe and several sealing soft rubber sheets. The lower end of the first liquid inlet pipe is formed with a convex tube portion for smoothly pushing open the several sealing soft rubber sheets, and the lower end of the convex tube portion is hollow. The upper end of the convex tube portion is formed with several first pipes that connect to the hollow structure therein. The lower end of the second liquid inlet pipe is formed with several second pipes that connect to the several first pipes after the first liquid inlet pipe rises. The top of the aluminum liquid tank is provided with a heating tube and a liquid delivery tube for pressing against the lower end of the convex tube portion and sealingly connecting to the hollow structure of the convex tube portion. The liquid delivery tube is located inside the heating tube.

[0007] Preferably, the tube body includes an upper circular tube and a lower circular tube that are coaxially and sealed together. The top of the upper circular tube is sealed and fixed to the liquid inlet. The upper end of the second liquid inlet tube is fixed to the lower end of the upper circular tube, and the second liquid inlet tube is sealed and connected to the lower circular tube. The upper ends of a plurality of sealing soft rubber sheets are fixed to the lower end of the lower circular tube.

[0008] Preferably, the lower end of the upper circular tube is coaxially provided with an annular groove, the upper end of the second liquid inlet tube is formed with an annular portion for fixed connection with the annular groove, a sealing pipe is coaxially fixed inside the second liquid inlet tube, the upper end of the first liquid inlet tube extends into the sealing pipe and is dynamically sealed to the sealing pipe, and the upper end of the first liquid inlet tube is elastically connected to the sealing pipe.

[0009] Preferably, the sealing fitting includes:

[0010] The upper disc is coaxially fixed to the top of the second liquid inlet pipe, and the upper disc has several hollowed-out slots for the aluminum liquid to pass through.

[0011] The lower sleeve has an open structure at both the top and bottom. Its top is coaxially and sealed to the bottom of the upper disc. The upper end of the first inlet pipe extends into the lower sleeve and slides with the lower end of the lower sleeve. The first inlet pipe and the lower sleeve are dynamically sealed together. The upper end of the first inlet pipe is coaxially fixed with an anti-rotation disc that slides along the axial direction of the lower sleeve inside the lower sleeve. The anti-rotation disc has two symmetrically arranged protrusions that slide with the lower sleeve. A spring is also coaxially arranged inside the lower sleeve, and the upper and lower ends of the spring abut against the upper disc and the anti-rotation disc, respectively.

[0012] Preferably, the lower end of the second inlet pipe is formed with a second convex opening adapted to the convex pipe structure, the lower ends of several second pipes are connected to the inner ring of the second convex opening, and the upper end of each first pipe is rounded.

[0013] Preferably, the lower end of the first inlet pipe is formed with a first protrusion, the upper end of the liquid delivery pipe is formed with a constriction, and the top of the constriction is provided with a cylindrical groove adapted to the structure of the first protrusion.

[0014] Preferably, each of the sealing soft rubber sheets has bends formed on both sides for adhering to adjacent sealing soft rubber sheets.

[0015] Preferably, the liquid inlet fitting is further provided with a protective sleeve that is fixedly connected to the liquid inlet, and the protective sleeve has several elongated through grooves.

[0016] The beneficial effects of this invention compared to the prior art are:

[0017] Firstly, the present invention uses a vertically lifting platform to drive the aluminum liquid tank to rise and fall vertically. The first liquid inlet pipe is lifted by the liquid delivery pipe, so that after the convex pipe passes the lower end of several sealing soft rubber sheets, the convex pipe and the lower end of the second liquid inlet pipe are sealed and connected, so as to realize the rapid docking of the impregnation tank and the aluminum liquid tank.

[0018] Secondly, in this invention, several sealing soft rubber sheets at the lower end of the lower round tube are closely attached to the first liquid inlet tube. The pressure of the external atmospheric pressure on the sealing soft rubber sheets can effectively maintain the sealing of the lower end of the liquid inlet tube. In addition, with the convex tube part that can be raised and lowered, it will not affect the docking and separation of the impregnation tank and the aluminum liquid tank. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of an embodiment.

[0020] Figure 2 This is a top view of an embodiment.

[0021] Figure 3 yes Figure 2 A sectional view along line AA.

[0022] Figure 4 yes Figure 3 Enlarged view of the local structure at point B.

[0023] Figure 5 This is an exploded three-dimensional view of the tube body, liquid delivery tube, and sealing soft rubber sheet in the embodiment.

[0024] Figure 6 yes Figure 5 Enlarged view of the local structure at point C.

[0025] Figure 7 This is a three-dimensional structural diagram of the sealing pipe and the first liquid inlet pipe in the embodiment.

[0026] Figure 8 This is a top view of the sealing pipe and the first inlet pipe in the embodiment.

[0027] Figure 9 yes Figure 8 Sectional view along line DD.

[0028] Figure 10 This is an exploded three-dimensional view of the sealing pipe fitting in the embodiment.

[0029] The numbers on the map are:

[0030] 1. Horizontal platform; 2. Impregnation tank; 3. Lifting platform; 4. Aluminum liquid tank; 5. First air extraction port; 6. Second air extraction port; 7. Air inlet; 8. Liquid inlet; 9. First liquid inlet pipe; 10. Second liquid inlet pipe; 11. Sealing soft rubber sheet; 12. Protruding tube section; 13. First pipe; 14. Second pipe; 15. Heating tube; 16. Liquid delivery pipe; 17. Heater; 18. Upper round tube; 19. Lower round tube; 20. Circular ring section; 21. Upper disc; 22. Hollowed-out through groove; 23. Lower tube sleeve; 24. Anti-rotation disc; 25. Protruding strip section; 26. Spring; 27. Anti-loosening nut; 28. Second protruding opening section; 29. ​​First protruding opening section; 30. Narrowing section; 31. Cylindrical recess; 32. Bending section; 33. Protective tube sleeve; 34. Long through groove. Detailed Implementation

[0031] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0032] refer to Figures 1 to 10The pressureless impregnation preparation equipment for diamond high thermal conductivity material powder shown includes a horizontal platform 1, a detachable impregnation tank 2 mounted on top of the horizontal platform 1, a lifting platform 3 located directly below the horizontal platform 1 and capable of vertical lifting, and an aluminum liquid tank 4 fixedly mounted on top of the lifting platform 3. The top of the impregnation tank 2 is provided with a first air extraction port 5 for evacuating the impregnation tank 2. The top of the aluminum liquid tank 4 is provided with a second air extraction port 6 and an air inlet 7. A liquid inlet 8 is formed at the center of the bottom of the impregnation tank 2, and a liquid inlet pipe is fixedly connected to the liquid inlet 8. The liquid inlet pipe includes a hollow cylindrical tube body, a first liquid inlet pipe 9 coaxial with the tube body, a second liquid inlet pipe 10 coaxially fixed to the tube body, and several sealing soft rubber sheets 11 evenly distributed along the circumference and fixed to the bottom of the tube body. The first liquid inlet pipe 9 is elastically slidably mounted downwards on the... Inside the second liquid inlet pipe 10, the second liquid inlet pipe 10 has a hollow tube structure that is larger at the top and smaller at the bottom, and the first liquid inlet pipe 9 is dynamically sealed to the lower end of the second liquid inlet pipe 10. The lower end of the first liquid inlet pipe 9 protrudes from the second liquid inlet pipe 10 and several sealing soft rubber sheets 11 from top to bottom. The lower end of the first liquid inlet pipe 9 is formed with a convex tube portion 12 for smoothly pushing open the several sealing soft rubber sheets 11, and the lower end of the convex tube portion 12 has a hollow structure. The upper end of the convex tube portion 12 is formed with several first pipes 13 that connect to its hollow structure. The lower end of the second liquid inlet pipe 10 is formed with several second pipes 14 that connect to the several first pipes 13 after the first liquid inlet pipe 9 rises. The top of the aluminum liquid tank 4 is provided with a heating pipe 15 and a liquid delivery pipe 16 for pressing against the lower end of the convex tube portion 12 and sealingly connecting to the hollow structure of the convex tube portion 12. The liquid delivery pipe 16 is located inside the heating pipe 15.

[0033] The impregnation tank 2 contains diamond powder (not shown in the figure) that has undergone vibration and coating treatment, and the aluminum liquid tank 4 contains molten aluminum liquid (not shown in the figure). A porous ceramic (not shown in the figure) is also provided at the inlet 8 to prevent the diamond powder from falling downwards. The molten aluminum liquid can enter and exit the impregnation tank 2 through the pores of the porous ceramic. Heaters 17 are provided in the heating pipe 15, the impregnation tank 2, and the aluminum liquid tank 4. The horizontal platform 1 in this invention is fixedly positioned directly above the lifting platform 3. Several impregnation tanks 2 are successively vacuumed and fixed on the horizontal platform 1. Molten aluminum liquid is then injected into the corresponding impregnation tank 2 through the aluminum liquid tank 4, thereby impregnating the diamond powder in the several impregnation tanks 2. The heater 17 is used to maintain a suitable temperature for the diamond powder and aluminum liquid during the impregnation process. The first evacuation port 5 and the second evacuation port 6 are used to evacuate air to maintain a vacuum environment in the impregnation tank 2 and the aluminum liquid tank 4. The first evacuation port 5 is also equipped with a high-temperature resistant valve body (not shown in the figure) to ensure that the impregnation tank 2 can move freely after being evacuated. When it is necessary to inject aluminum liquid into the impregnation tank 2, high-pressure inert gas can be injected into the aluminum liquid tank 4 through the air inlet 7. The aluminum liquid is injected into the impregnation tank 2 through the liquid delivery pipe 16 and the liquid inlet fitting. The liquid delivery pipe 16 is equipped with a high-temperature resistant ball valve (not shown in the figure). When the aluminum liquid tank 4 is evacuated, the ball valve is closed, and the ball valve is opened after the liquid delivery pipe 16 is connected to the first liquid inlet pipe 9.

[0034] The tube body includes an upper circular tube 18 and a lower circular tube 19 that are coaxially sealed and fixed. The top of the upper circular tube 18 is sealed and fixed to the liquid inlet 8. The upper end of the second liquid inlet tube 10 is fixed to the lower end of the upper circular tube 18, and the second liquid inlet tube 10 and the lower circular tube 19 are sealed and connected. The upper ends of several sealing soft rubber sheets 11 are fixed to the lower end of the lower circular tube 19.

[0035] High-temperature resistant sealing rings (not shown in the figure) are provided between the upper circular tube 18 and the liquid inlet 8, between the upper circular tube 18 and the lower circular tube 19, between the lower circular tube 19 and the second liquid inlet tube 10, between the lower end of the second liquid inlet tube 10 and the first liquid inlet tube 9, and between the lower end of the lower circular tube 19 and several sealing soft rubber sheets 11 to maintain a seal. The sealing soft rubber sheets 11 are in the shape of... Figures 4 to 6 The structure shown has the first inlet pipe 9 and the protruding pipe portion 12 in the form of... Figure 4The structure shown includes a flexible metal frame (not shown) and an outer layer of soft rubber (not shown) covering the flexible metal frame. The outer layer of soft rubber is made of a high-temperature resistant soft rubber material. The upper end of the flexible metal frame is made of a harder material, while the lower end is made of a softer material. When the first inlet pipe 9 rises or falls, the upper or lower end of the convex tube 12 can push open the lower ends of the plurality of sealing soft rubber sheets 11. When the first inlet pipe 9 is not subjected to external force, the convex tube 12 is located below the plurality of sealing soft rubber sheets 11. When a vacuum is drawn through the first air extraction port 5 inside the impregnation chamber 2, the air pressure inside the impregnation chamber 2 gradually decreases, and the external atmospheric pressure exerts pressure on several sealing soft rubber sheets 11, causing the lower ends of the several sealing soft rubber sheets 11 to close and stick tightly to the first liquid inlet pipe 9. As the air pressure inside the impregnation chamber 2 decreases, the several sealing soft rubber sheets 11 stick tighter and tighter, thereby achieving the effect of sealing the lower end of the pipe. Subsequently, after the valve body inside the first air extraction port 5 is closed, it can be ensured that the impregnation chamber 2 still maintains a vacuum environment.

[0036] The lower end of the upper circular tube 18 is coaxially provided with an annular groove. The upper end of the second liquid inlet tube 10 is formed with an annular portion 20 for fixed connection with the annular groove. A sealing pipe is coaxially fixed inside the second liquid inlet tube 10. The upper end of the first liquid inlet tube 9 extends into the sealing pipe and is dynamically sealed to the sealing pipe. The upper end of the first liquid inlet tube 9 is elastically connected to the sealing pipe.

[0037] The annular sink is not shown in the figure. The sealing pipe is made of high-temperature resistant heat insulation material. The upper end of the first liquid inlet pipe 9 extends into the sealing pipe and is elastically connected to the sealing pipe, thereby maintaining a downward movement trend.

[0038] The sealing pipe includes:

[0039] The upper disc 21 is coaxially fixed to the top of the second liquid inlet pipe 10. The upper disc 21 has several hollowed-out through slots 22 for the aluminum liquid to pass through.

[0040] The lower sleeve 23 has an open structure at both the top and bottom. Its top is coaxially and sealed to the bottom of the upper disc 21. The upper end of the first liquid inlet pipe 9 extends into the lower sleeve 23 and slides with the lower end of the lower sleeve 23. The first liquid inlet pipe 9 and the lower sleeve 23 are dynamically sealed together. The upper end of the first liquid inlet pipe 9 is coaxially and fixedly connected to an anti-rotation disc 24 that slides along the axial direction of the lower sleeve 23. The anti-rotation disc 24 has two symmetrically arranged protrusions 25 that slide with the lower sleeve 23. A spring 26 is also coaxially arranged inside the lower sleeve 23, and the upper and lower ends of the spring 26 abut against the upper disc 21 and the anti-rotation disc 24, respectively.

[0041] The spring 26 is made of high-temperature resistant metal material. The upper disc 21 and the lower sleeve 23 are both made of high-temperature resistant heat-insulating material to further protect the spring 26. The upper end of the first inlet pipe 9 protrudes from the anti-rotation disc 24 and is formed with external threads. The upper end of the first inlet pipe 9 is threaded with an anti-disengagement nut 27 for fixing the anti-rotation disc 24 on the first inlet pipe 9. The anti-disengagement nut 27 is also made of high-temperature resistant metal material. The lower end of the lower sleeve 23 is fitted with a high-temperature resistant sealing ring (not shown in the figure) to maintain a dynamic sealing connection between it and the upper end of the first inlet pipe 9. A high-temperature resistant sealing ring (not shown in the figure) is provided between the upper disc 21 and the lower sleeve 23. The inner wall of the lower sleeve 23 has two axial grooves (e.g., corresponding to the two protruding parts 25) that are formed one-to-one. Figure 10 As shown, the two protruding parts 25 slide with the axial sink to ensure that the anti-rotation disc 24 will not rotate during the sliding process in the lower sleeve 23, thereby ensuring that the first inlet pipe 9 will not rotate, thus ensuring that after the first inlet pipe 9 is raised, several first pipes 13 can be connected to several second pipes 14.

[0042] The lower end of the second inlet pipe 10 is formed with a second protruding opening 28 adapted to the structure of the protruding pipe portion 12. The lower ends of several second pipes 14 are connected to the inner ring of the second protruding opening 28, and the upper end of each first pipe 13 is rounded.

[0043] The inner ring of the second protrusion 28 is also fixed with a high-temperature resistant sealing ring (not shown in the figure), so that after the protruding tube 12 presses against the second protruding part 28 upward, the sealing connection between the protruding tube 12 and the second protruding part 28 is maintained. The outward convex structure of the upper end of the protruding tube 12 can better ensure the tight fit between it and the high-temperature resistant sealing ring. The upper end of the first pipe 13 is rounded to ensure that the protruding tube 12 will not easily scratch the sealing soft rubber sheet 11 when it pushes open several sealing soft rubber sheets 11 upward.

[0044] The lower end of the first liquid inlet pipe 9 is formed with a first protrusion 29, and the upper end of the liquid delivery pipe 16 is formed with a constriction 30, and the top of the constriction 30 is provided with a cylindrical groove 31 adapted to the structure of the first protrusion 29.

[0045] The diameter of the liquid delivery pipe 16 is larger than that of the first protrusion 29. The smaller diameter constriction 30 allows it to easily connect with the first protrusion 29 after being raised. A high-temperature resistant sealing ring (not shown in the figure) is fixed inside the cylindrical recess 31 to ensure that when the lifting platform 3 rises, driving the aluminum liquid tank 4 and the liquid delivery pipe 16 to rise, the constriction 30 can rise and contact the first protrusion 29, sealing the constriction 30 with the first protrusion 29. The lifting platform 3 will continue to rise until the first protrusion 29 is reached. The liquid inlet pipe 9 is pushed up by force until the convex part 12 is pressed against the inner ring of the second convex part 28. In this way, the liquid delivery pipe 16, the first liquid inlet pipe 9 and the second liquid inlet pipe 10 are all rigidly pressed together, which can also ensure the sealing connection between the three. This ensures that after the aluminum liquid is pressurized and rises, it can be sent into the second liquid inlet pipe 10 through the liquid delivery pipe 16, several first pipes 13 and several second pipes 14, and then sent upward through the hollow through groove 22 on the upper disc 21 to the upper round pipe 18, and finally sent into the impregnation tank 2.

[0046] Each of the sealing soft rubber sheets 11 has bends 32 formed on both sides for attaching tightly to adjacent sealing soft rubber sheets 11.

[0047] The bending part 32 is also made of high-temperature resistant soft rubber material, and the bending part 32 is... Figure 6 The outward folding structure shown is integrally formed with the outer layer of soft rubber on the sealing soft rubber sheet 11. Under atmospheric pressure, adjacent folded portions 32 can stick together tightly, increasing the sealing ability.

[0048] The inlet pipe is also provided with a protective sleeve 33 that is fixedly connected to the inlet 8, and the protective sleeve 33 is provided with several elongated through grooves 34.

[0049] The liquid delivery pipe 16, the protective sleeve 33, and the pipe body are all made of high-temperature resistant thermally conductive material. The protective sleeve 33 is used to protect the pipe body, the first liquid inlet pipe 9, and several sealing soft rubber sheets 11. Several long through grooves 34 are used to increase the thermal conductivity of the protective sleeve 33, ensuring that the heating pipe 15 can fully heat the aluminum liquid in the liquid delivery pipe 16 and the liquid inlet pipe, and preventing the aluminum liquid from cooling down excessively.

[0050] Working principle: During impregnation, the impregnation tank 2 and the aluminum liquid tank 4 are first evacuated to a vacuum state through the first evacuation port 5 and the second evacuation port 6 respectively (the ball valve is closed during vacuuming). The impregnation tank 2 and the aluminum liquid tank 4 are then kept at a suitable temperature for a period of time to ensure the diamond powder and aluminum liquid are at appropriate temperatures. When the impregnation tank 2 is evacuated, as the air pressure inside the impregnation tank 2 decreases, the external atmospheric pressure presses the lower ends of several sealing soft rubber sheets 11 against the upper end of the protruding tube 12 on the first liquid inlet pipe 9, thus ensuring the lower end of the tube is sealed and maintaining the vacuum environment inside the impregnation tank 2. After the impregnation tank 2 is evacuated to a vacuum state, the valve at the first evacuation port 5 is closed, the impregnation tank 2 is moved to the horizontal platform 1 and fixed, and then the aluminum liquid tank 4 is lifted to the horizontal platform 1 via the lifting platform 3. At a specified height, the liquid delivery pipe 16 is connected to the first liquid inlet pipe 9, and the heating pipe 15 extends outside the liquid inlet pipe fitting. During the rise of the aluminum liquid tank 4, the constricted portion 30 first abuts against the first protruding portion 29. Then, through the hard contact between the constricted portion 30 and the first protruding portion 29, the elastic force of the spring 26 is overcome, and the first liquid inlet pipe 9 is lifted up. This causes the protruding tube portion 12 to push open the lower ends of several sealing soft rubber sheets 11. Afterward, the protruding tube portion 12 passes over several sealing soft rubber sheets 11, and the lower ends of several sealing soft rubber sheets 11 wrap around the lower end of the protruding tube portion 12 (because the vacuuming inside the impregnation tank 2 is only to reduce the air pressure inside the impregnation tank 2 to a sufficiently low range, rather than to an absolute vacuum, and the diameters of the first liquid inlet pipe 9 at the upper and lower ends of the protruding tube portion 12 are the same, the protruding tube portion 12 passes over several sealing soft rubber sheets 11). The sealing time of the lower end of the soft rubber sheet 11 is very short, so after the convex tube 12 expands the several sealing soft rubber sheets 11, the amount of gas seeping into the several sealing soft rubber sheets 11 is negligible and will not affect the vacuum environment in the impregnation tank 2. After the lower ends of the several sealing soft rubber sheets 11 wrap around the lower end of the convex tube 12, under the action of external atmospheric pressure, the lower ends of the several sealing soft rubber sheets 11 still stick tightly to the first liquid inlet pipe 9, maintaining the sealed state. Finally, the first liquid inlet pipe 9 rises to the state where the convex tube 12 presses against the second convex opening 28, and the several first pipes 13 are connected to the several second pipes 14. Then the ball valve is opened, and high-pressure inert gas is injected into the aluminum liquid tank 4 through the air inlet 7, so that the aluminum liquid in the aluminum liquid tank 4 flows into the first liquid inlet pipe 16. The liquid enters from the lower end of the inlet pipe 9 and then from several first pipes 13 on the convex pipe 12 into several second pipes 14 at the lower end of the second inlet pipe 10. It then flows into the upper end of the second inlet pipe 10 and finally passes through several hollowed-out slots 22 on the upper disc 21 into the upper circular pipe 18, and then into the impregnation tank 2. A suitable amount of inert gas is continuously introduced to ensure sufficient aluminum liquid permeates into the impregnation tank 2. Afterward, pressure is maintained for a period to ensure the aluminum liquid fully permeates the gaps in the diamond powder. Then, the heat preservation of the impregnation tank 2 and the aluminum liquid tank 4 is stopped, and pressure is maintained for a period before depressurization, allowing the material in the impregnation tank 2 to cool and the aluminum liquid to flow back into the aluminum liquid tank 4. Finally, the lifting platform 3 is lowered, allowing the aluminum liquid tank 4 to return to its original position, while the first inlet pipe 9 descends under the action of the spring 26.This causes the convex tube 12 to expand by spreading several sealing rubber sheets 11 until the anti-rotation disc 24 touches the bottom of the lower sleeve 23. The sealing rubber sheets 11 then close and adhere tightly to the upper end of the convex tube 12. This completes the impregnation operation of one impregnation tank 2. Following this process, diamond powder in several impregnation tanks 2 can be impregnated sequentially.

[0051] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A device for preparing diamond high-thermal-conductivity material powder by pressureless infiltration, comprising a horizontal carrier (1) in a horizontal state, a detachable infiltration box (2) arranged on the top of the horizontal carrier (1), a lifting platform (3) vertically movable and located directly below the horizontal carrier (1), and an aluminum liquid tank (4) fixedly arranged on the top of the lifting platform (3), wherein a first air outlet (5) for vacuumizing the infiltration box (2) is arranged on the top of the infiltration box (2), and a second air outlet (6) and an air inlet (7) are arranged on the top of the aluminum liquid tank (4). The bottom center of the impregnation box (2) is formed with a liquid inlet (8), and a liquid inlet pipe is fixedly connected at the liquid inlet (8). The liquid inlet pipe comprises a tubular body in a hollow cylindrical structure, a first liquid inlet pipe (9) coaxially arranged with the tubular body, a second liquid inlet pipe (10) coaxially fixedly connected in the tubular body, and a plurality of sealing soft rubber sheets (11) uniformly distributed in the circumferential direction and fixedly connected with the bottom of the tubular body. The first liquid inlet pipe (9) is elastically and downwardly arranged in the second liquid inlet pipe (10). The second liquid inlet pipe (10) has a hollow pipe structure with a large upper end and a small lower end. The lower end of the first liquid inlet pipe (9) is movably sealed with the lower end of the second liquid inlet pipe (10). The lower end of the first liquid inlet pipe (9) protrudes the second liquid inlet pipe (10) and the plurality of sealing soft rubber sheets (11) from top to bottom in sequence. The lower end of the first liquid inlet pipe (9) is formed with a convex pipe portion (12) for smoothly pushing away the plurality of sealing soft rubber sheets (11). The lower end of the convex pipe portion (12) has a hollow structure. The upper end of the convex pipe portion (12) is formed with a plurality of first pipes (13) communicating with the hollow structure. The lower end of the second liquid inlet pipe (10) is formed with a plurality of second pipes (14) for communicating with the plurality of first pipes (13) after the first liquid inlet pipe (9) is raised. The top of the aluminum liquid tank (4) is provided with a heating pipe (15) and a liquid delivery pipe (16) for abutting against the lower end of the convex pipe portion (12) and sealingly communicating with the hollow structure of the convex pipe portion (12). The liquid delivery pipe (16) is located in the heating pipe (15).

2. The apparatus for preparing diamond high thermal conductivity material powder by pressureless infiltration according to claim 1, wherein, The tubular body comprises an upper circular pipe (18) and a lower circular pipe (19) which are coaxially and sealingly fixed. The top of the upper circular pipe (18) is sealingly and fixedly connected with the liquid inlet (8). The upper end of the second liquid inlet pipe (10) is fixedly connected with the lower end of the upper circular pipe (18). The second liquid inlet pipe (10) is sealingly connected with the lower circular pipe (19). The upper ends of the plurality of sealing soft rubber sheets (11) are fixedly connected with the lower end of the lower circular pipe (19).

3. The apparatus for preparing diamond high thermal conductivity material powder by pressureless infiltration according to claim 2, characterized in that, The lower end of the upper circular pipe (18) is coaxially provided with an annular groove. The upper end of the second liquid inlet pipe (10) is formed with a circular ring portion (20) for fixedly connecting with the annular groove. A sealing pipe is coaxially fixedly connected in the second liquid inlet pipe (10). The upper end of the first liquid inlet pipe (9) extends into the sealing pipe and is movably and sealingly connected with the sealing pipe. The upper end of the first liquid inlet pipe (9) is elastically connected with the sealing pipe.

4. The apparatus for preparing diamond high thermal conductivity material powder by pressureless infiltration according to claim 3, characterized in that, The sealing pipe comprises: an upper disc (21) coaxially fixedly connected with the top end of the second liquid inlet pipe (10). A plurality of hollow through grooves (22) are formed in the upper disc (21) for passing the aluminum liquid. The lower pipe sleeve (23) with open structure at both ends is coaxially and tightly connected with the bottom of the upper disc (21), the upper end of the first liquid inlet pipe (9) extends into the lower pipe sleeve (23) and is in sliding fit with the lower end of the lower pipe sleeve (23), the dynamic seal is connected between the first liquid inlet pipe (9) and the lower pipe sleeve (23), the upper end of the first liquid inlet pipe (9) is coaxially connected with the anti-rotation disc (24) which is arranged in the lower pipe sleeve (23) in axial sliding mode, the anti-rotation disc (24) is formed with two symmetrically arranged convex strip portions (25) which are in sliding fit with the lower pipe sleeve (23), the spring (26) is coaxially arranged in the lower pipe sleeve (23), and the upper and lower ends of the spring (26) abut against the upper disc (21) and the anti-rotation disc (24) respectively.

5. The apparatus for preparing diamond high thermal conductivity material powder by pressureless infiltration according to claim 1, wherein, The lower end of the second liquid inlet pipe (10) is formed with a second notch portion (28) which is adapted to the structure of the convex pipe portion (12), the lower ends of the plurality of second pipes (14) are communicated to the inner ring of the second notch portion (28), and the upper end of each first pipe (13) is rounded.

6. The apparatus for preparing diamond high thermal conductivity material powder by pressureless infiltration according to claim 1, wherein, The lower end of the first liquid inlet pipe (9) is formed with a first notch portion (29), the upper end of the liquid delivery pipe (16) is formed with a necked portion (30), and the top end of the necked portion (30) is provided with a cylindrical groove (31) which is adapted to the structure of the first notch portion (29).

7. The apparatus for preparing diamond high thermal conductivity material powder by pressureless infiltration according to claim 1, wherein, Both sides of each sealing soft rubber sheet (11) are formed with bending portions (32) which are used for closely attaching adjacent sealing soft rubber sheets (11).

8. The apparatus for preparing diamond high thermal conductivity material powder by pressureless infiltration according to claim 1, wherein, The liquid inlet pipe assembly is further provided with a protective pipe sleeve (33) which is fixedly connected with the liquid inlet (8), and a plurality of long slot grooves (34) are formed in the protective pipe sleeve (33).

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