An arc generator for graphene exfoliation and its manufacturing method

Abstract

The present invention relates to an arc generator for graphene exfoliation, belonging to the technical field of arc generators. It includes a mandrel forming an annular reaction chamber and an outer ring sleeve surrounding the outside of the mandrel. One end of the outer ring sleeve is hermetically connected to one end of the mandrel, and an installation flange is provided at the other end of the outer ring sleeve. The other end of the mandrel extends out of the installation flange and is provided with a conductive flange. An annular cooling chamber is formed between the mandrel, the outer ring sleeve and the installation flange, and cooling medium inlets and outlets are provided on the flange. The present invention also discloses a manufacturing method for an arc generator for graphene exfoliation. Through the manufacturing method of the arc generator of the present invention, it is realized that different materials are used for different parts of the arc generator according to different performance requirements, improving the service life of the arc generator and reducing the manufacturing cost of the arc generator.

Description

Technical Field

[0001] The invention relates to an arc generator for graphene exfoliation and a manufacturing method thereof, belonging to the technical field of arc generators. Background Art

[0002] At present, the main methods for producing graphene include mechanical exfoliation, chemical vapor deposition, electric assisted oxidation, redox and arc methods. The arc method for preparing carbon nanomaterials is to place a graphite electrode in a container with a buffer gas or reactive gas atmosphere, and to stimulate an arc between the two electrodes to ionize the gas to produce a high-temperature plasma. Under such conditions, the graphite will melt and evaporate. Depending on the reaction conditions, the products generated include amorphous carbon, graphene and single-walled or multi-walled carbon nanotubes. Due to the advantages of simple arc discharge equipment, short preparation cycle, convenient operation, high controllability, extremely fast cooling rate and controllable reaction atmosphere, the arc method has been widely used in the preparation of graphene materials.

[0003] The arc generator is the main component of the arc exfoliation graphene equipment. There is a cavity inside for arc reaction. Because the DC discharge in the cavity generates high temperature to ablate the arc generator, the service life of the arc generator is short. In order to improve the service life of the arc generator, the traditional method is generally to cast the arc generator as a whole with a material with high strength and hardness, and good conductivity, thermal conductivity, wear resistance and friction reduction, but the manufacturing cost increases. Summary of the invention

[0004] The purpose of the present invention is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0005] The present invention provides an arc generator for graphene exfoliation, comprising a core shaft constituting an annular reaction chamber, and an outer ring sleeve surrounding the outside of the core shaft, one end of the outer ring sleeve being tightly connected to one end of the core shaft, the other end of the outer ring sleeve being provided with a mounting flange, the other end of the core shaft extending out of the mounting flange and being provided with a conductive flange, an annular cooling chamber being formed between the core shaft, the outer ring sleeve and the mounting flange, and a cooling medium inlet and outlet being provided on the flange.

[0006] Furthermore, the annular reaction chamber is a circular through hole or a polygonal through hole.

[0007] Furthermore, the outer ring sleeve includes an annular reaction section and a flange connection section, and the outer contour of the annular reaction section is a truncated cone.

[0008] Furthermore, the annular reaction section is made of high-temperature resistant chromium-zirconium copper, the flange connection section, core shaft and conductive flange are made of pure copper, the mounting flange is made of stainless steel, and both ends of the annular reaction section are welded to the core shaft and the flange connection section respectively.

[0009] Because the annular reaction section is connected to the core shaft, high temperature will be generated when an arc reaction occurs in the annular reaction chamber of the core shaft. Therefore, the temperature of the annular reaction section is higher than the temperature of other positions of the generator. Therefore, the material of the annular reaction section is selected to be chromium-zirconium copper, which is resistant to high temperatures and relatively expensive; the mounting flange mainly plays the role of installation, fixing and sealing, and the cheaper stainless steel material is selected; the conductive flange is connected to the power supply, and the pure copper material with a price between chromium-zirconium copper and stainless steel is selected, because pure copper has good electrical conductivity.

[0010] Furthermore, a liquid inlet pipe and a liquid outlet pipe are respectively provided on the cooling medium inlet and outlet, and one end of the liquid outlet pipe extends to the annular cooling cavity near the annular reaction section or inside the annular reaction section.

[0011] Furthermore, the conductive flange is provided with a power connection hole, and the power connection hole is connected to a power source.

[0012] The present invention also discloses a method for manufacturing an arc generator for graphene exfoliation, which specifically comprises the following steps:

[0013] (1) The annular reaction section, flange connection section, mandrel, mounting flange and conductive flange are manufactured respectively by casting or forging process;

[0014] (2) machining an annular lower embedding groove on the mounting flange obtained in step (1), and machining a side surface of the annular lower embedding groove away from the core shaft into a slope surface;

[0015] (3) Both ends of the annular reaction section obtained in step (1) and one end of the flange connection section are processed with welding bevel surfaces;

[0016] (4) butting one end of the flange connection section obtained in step (3) with the welding bevel surface with one end of the annular reaction section to form a welding groove, filling the partition space in the welding groove with welding deposited metal, and performing cover welding on the surface of the welding groove;

[0017] (5) inserting the other end of the flange connection section obtained in step (4) into the annular lower embedding groove to form a welding groove between the flange connection section and the mounting flange, filling the partition space in the welding groove with welding deposited metal, and performing cover welding on the surface of the welding groove;

[0018] (6) passing one end of the mandrel obtained in step (1) through the mounting flange and docking with the annular reaction section to form a welding groove, filling the partition space in the welding groove with welding deposited metal, and performing cover welding on the surface of the welding groove;

[0019] (7) Align the liquid inlet pipe and the liquid outlet pipe with the inlet and outlet on the mounting flange, and respectively weld the liquid inlet pipe and the liquid outlet pipe to the mounting flange;

[0020] (8) The conductive flange obtained in step (1) is sleeved onto the other end of the core shaft and welded to the core shaft.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention adopts different materials according to the different performance requirements of different use parts. Each part is formed by welding. The combination of different materials can not only ensure the performance requirements of each part, but also reduce the manufacturing cost of the arc generator;

[0023] 2. After the cooling medium is injected into the annular cooling cavity of the present invention, the temperature of the arc generator can be reduced, thereby extending the overall service life of the arc generator;

[0024] 3. Through the manufacturing method of the arc generator of the present invention, the arc generator can be made of different materials according to the different performance requirements of different use parts, thereby increasing the service life of the arc generator and reducing the manufacturing cost of the arc generator;

[0025] 4. The manufacturing method of the arc generator of the present invention processes the ends of the arc generator where different parts for use are interconnected into a groove structure, and then welds the different parts for use of the arc generator into an integrated structure. This welding method has good sealing properties at the welding point and can effectively prevent coolant from flowing out of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an isometric view of the present invention;

[0027] Figure 2 It is a front view of the present invention;

[0028] Figure 3 A top view of the present invention;

[0029] Figure 4 It is a schematic diagram of the assembly structure of each part of the present invention;

[0030] In the figure, 1, core shaft; 2, annular reaction chamber; 3, outer ring sleeve; 301, annular reaction section; 302, flange connection section; 4, mounting flange; 5, conductive flange; 6, annular cooling chamber; 7, liquid inlet pipe; 8, liquid outlet pipe; 9, welding groove. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] Figure 1-4 The structure of the arc generator for graphene exfoliation of the present invention and the method for manufacturing the arc generator for graphene exfoliation are schematically shown.

[0033] like Figures 1 to 3 As shown, in the first embodiment, the present invention discloses an arc generator for graphene exfoliation, including a core shaft 1 constituting an annular reaction chamber 2, and an outer ring sleeve 3 surrounding the outside of the core shaft 1, one end of the outer ring sleeve 3 is tightly connected to one end of the core shaft 1, and the other end of the outer ring sleeve 3 is provided with a mounting flange 4, and the mounting flange 4 is also provided with a mounting hole. The other end of the core shaft 1 extends out of the mounting flange 4 and is provided with a conductive flange 5, and an annular cooling chamber 6 is formed between the core shaft 1, the outer ring sleeve 3 and the mounting flange 4, and the flange is provided with a cooling medium inlet and outlet.

[0034] The annular reaction chamber 2 is a circular through hole or a polygonal through hole.

[0035] The outer ring sleeve 3 includes an annular reaction section 301 and a flange connection section 302 , and the outer contour of the annular reaction section 301 is a truncated cone.

[0036] The material of the annular reaction section 301 is high-temperature resistant chromium-zirconium copper. Since the annular reaction section 301 is connected to the core shaft 1, the temperature of the annular reaction section 301 is relatively high when an arc reaction occurs. Chromium-zirconium copper is a high-temperature resistant conductive metal material with good electrical conductivity and thermal conductivity, meeting the use requirements. The flange connection section 302, the core shaft 1 and the conductive flange 5 are made of pure copper, and the two ends of the annular reaction section 301 are welded to the core shaft 1 and the flange connection section 302 respectively.

[0037] The cooling medium inlet and outlet are provided with a liquid inlet pipe 7 and a liquid outlet pipe 8, respectively, and one end of the liquid outlet pipe 8 extends to the annular cooling chamber 6 near the annular reaction section 301 or into the annular reaction section 301. After the cooling medium is injected into the annular cooling chamber 6, the cooling liquid circulates through the liquid inlet pipe 7 and the liquid outlet pipe 8, and the heat generated by the arc reaction is taken away in time, which can reduce the temperature of the arc generator and extend the overall service life of the arc generator.

[0038] The conductive flange 5 is provided with a power connection hole and a fixing hole connected to the counterpart, and the power connection hole is connected to the power supply. When the conductive flange 5 is connected to the power supply and energized, the generator becomes a cathode / anode electrode.

[0039] like Figure 4 As shown, in a second specific embodiment, the present invention discloses a method for manufacturing an arc generator for graphene exfoliation, which specifically includes the following steps:

[0040] (1) According to different performance requirements of different use parts, different materials are used to manufacture the annular reaction section 301, the flange connection section 302, the core shaft 1, the mounting flange 4 and the conductive flange 5 respectively by using a casting or forging process; the annular reaction section 301 is made of high-temperature resistant chromium-zirconium copper, the flange connection section 302, the core shaft 1 and the conductive flange 5 are made of pure copper, and the two ends of the annular reaction section 301 are welded to the core shaft 1 and the flange connection section 302 respectively.

[0041] (2) machining an annular lower embedding groove on the mounting flange 4 obtained in step (1), and machining a side surface of the annular lower embedding groove away from the core shaft 1 into a slope surface;

[0042] (3) Both ends of the annular reaction section 301 obtained in step (1) and one end of the flange connection section 302 are processed with welding slopes;

[0043] (4) butting one end of the flange connection section 302 obtained in step (3) with the welding bevel surface with one end of the annular reaction section 301 to form a welding groove 9, filling the partition space in the welding groove 9 with welding deposited metal, and performing cover welding on the surface of the welding groove;

[0044] (5) inserting the other end of the flange connection section 302 obtained in step (4) into the annular lower embedding groove, forming a welding groove 9 between the flange connection section 302 and the mounting flange 4, filling the partition space in the welding groove 9 with welding deposited metal, and performing cover welding on the surface of the welding groove;

[0045] (6) passing one end of the mandrel 1 obtained in step (1) through the mounting flange 4 and docking with the annular reaction section 301 to form a welding groove 9, filling the partition space of the welding groove 9 with welding deposited metal, and performing cover welding on the surface of the welding groove 9;

[0046] (7) Align the liquid inlet pipe 7 and the liquid outlet pipe 8 with the inlet and outlet on the mounting flange 4, and respectively weld the liquid inlet pipe 7 and the liquid outlet pipe 8 to the mounting flange 4;

[0047] (8) The conductive flange 5 obtained in step (1) is sleeved onto the other end of the core shaft 1 and welded to the core shaft 1.

[0048] Through the manufacturing method of the present invention, it is achieved that the arc generator uses different materials according to the different performance requirements of different use parts, thereby improving the service life of the arc generator and reducing the manufacturing cost of the arc generator; and the ends of the different use parts of the arc generator that are interconnected are processed into a groove structure, the welding molten metal is filled in the partition space of the welding groove 9, and the cover welding is performed on the surface of the welding groove 9. Through this welding method, the different use parts of the arc generator are welded into an integrated structure. This welding method has good sealing properties at the welding point and can effectively prevent coolant from flowing out of the weld.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A manufacturing method of an arc generator for graphene exfoliation, characterized in that, the arc generator for graphene exfoliation includes a mandrel forming an annular reaction chamber and an outer ring sleeve surrounding the outside of the mandrel. One end of the outer ring sleeve is hermetically connected to one end of the mandrel. An installation flange is provided at the other end of the outer ring sleeve. The other end of the mandrel extends out of the installation flange and is provided with a conductive flange. An annular cooling chamber is formed between the mandrel, the outer ring sleeve and the installation flange. Cooling medium inlets and outlets are provided on the flange; the annular reaction chamber is a circular through-hole or a polygonal through-hole; the outer ring sleeve includes an annular reaction section and a flange connection section, and the outer contour of the annular reaction section is frustum-shaped; the material of the annular reaction section is chromium zirconium copper, the materials of the flange connection section, the mandrel and the conductive flange are pure copper, the material of the installation flange is stainless steel, and both ends of the annular reaction section are welded to the mandrel and the flange connection section respectively; liquid inlet pipes and liquid outlet pipes are respectively provided on the cooling medium inlets and outlets, and one end of the liquid outlet pipe extends to a position near the annular reaction section or into the annular reaction section of the annular cooling chamber; specifically includes the following steps: (1) Respectively manufacture the annular reaction section, the flange connection section, the mandrel, the installation flange and the conductive flange by casting or forging processes; (2) Machine an annular lower embedding groove on the installation flange obtained in step (1), and machine one side surface of the annular lower embedding groove away from the mandrel into a slope surface; (3) Machine welding slope surfaces at both ends of the annular reaction section obtained in step (1) and one end of the flange connection section; (4) Butt one end of the flange connection section with a welding slope surface obtained in step (3) to the end of the annular reaction section to form a welding groove. Fill the partition space in the welding groove with welding deposition metal, and perform cover welding on the surface of the welding groove; (5) Insert the other end of the flange connection section obtained in step (4) into the annular lower embedding groove. A welding groove is formed between the flange connection section and the installation flange. Fill the partition space in the welding groove with welding deposition metal, and perform cover welding on the surface of the welding groove; (6) Pass one end of the mandrel obtained in step (1) through the installation flange and butt it with the annular reaction section to form a welding groove. Fill the partition space in the welding groove with welding deposition metal, and perform cover welding on the surface of the welding groove; (7) Align and install the liquid inlet pipe and the liquid outlet pipe to the inlets and outlets on the installation flange, and respectively weld and fix the liquid inlet pipe and the liquid outlet pipe to the installation flange; (8) Sleeve the conductive flange obtained in step (1) on the other end of the mandrel and weld it to the mandrel.

2. The manufacturing method of the arc generator for graphene exfoliation according to claim 1, characterized in that, a power connection hole is provided on the conductive flange, and the power connection hole is connected to a power source.

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