Cooling structure for graphitization furnace electrode

Abstract

The utility model provides a cooling structure of a graphitization furnace electrode, which comprises a cooling water jacket body and a resin layer, the cooling water jacket body is inserted into a blind hole at the end part of the electrode and is in contact with the bottom and the side wall of the blind hole; the diameter of the cooling water jacket is in clearance fit with the diameter of the blind hole; and the resin layer is filled in a gap between the water jacket body and the blind hole. According to the application, the contact oxidation of the electrode and water caused by water leakage of the cooling water jacket can be avoided, and the interference fit between the cooling water jacket and the blind hole can reduce the vibration, torsion and displacement of the cooling water jacket in a working state; the water jacket body is of an independent structure and is convenient to replace, and the problem that maintenance is difficult after damage or scale deposition is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of graphite manufacturing equipment, and in particular to a cooling structure for graphitization furnace electrodes. Background Art

[0002] In recent years, my country's new energy vehicle industry has developed rapidly, resulting in a shortage of lithium battery market. More than 70% of lithium battery negative electrode materials are made of artificial graphite. During the production process of artificial graphite, graphitization is required. Graphitization refers to the use of heat energy to transform unstable carbon atoms from a chaotic layer structure to a graphite crystal structure. The energy source for atomic rearrangement and structural transformation is high-temperature heat treatment. As the heat treatment temperature increases, d 002 (The distance between graphite layers) gradually decreases, and the change is significant when it reaches 2300℃. At 3000℃, the change tends to be slow until the entire graphitization process is completed.

[0003] In the structure of the existing graphitization furnace, many electrodes need to be installed. The electrodes will generate a lot of heat during use. The electrodes are in a high temperature environment and are seriously worn out. In order to avoid damage to the electrodes, they need to be cooled. However, many cooling water jackets currently used can only cool the electrodes protruding from the furnace body, and the top and internal cooling effects of the electrode body with the highest heat generation are poor. Some of the cooling methods use slots at the ends of the electrodes, which also have the disadvantages of oxidation caused by direct contact between the cooling water and the electrodes, water leakage, etc., or internal scale compaction affecting the cooling effect, making it inconvenient to repair and replace. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a cooling structure for graphitization furnace electrodes to solve the problems of low cooling efficiency of graphitization furnace electrodes and electrodes being easily oxidized by cooling water.

[0005] The technical solution adopted in this application is:

[0006] A cooling structure for a graphitization furnace electrode, wherein a blind hole is provided at the end of the graphitization furnace electrode located outside the graphitization furnace, the cooling structure comprises a cooling water jacket body and a resin layer, the resin layer is arranged on the outer surface of the cooling water jacket body, the cooling water jacket body is inserted into the blind hole of the graphitization electrode, and the resin layer is in contact with the bottom and side wall of the blind hole.

[0007] Furthermore, the water jacket body is inserted into the blind hole along its length direction, the length of the water jacket body is greater than the depth of the blind hole, and the difference between the length of the water jacket body and the depth of the blind hole is not less than 5 cm.

[0008] Furthermore, the cooling water jacket body includes a cylindrical hollow cylinder with one end closed and the other end open, and a flange end cover, the open end of the hollow cylinder cooperates with the flange end cover to form a closed space, the closed end of the cooling water jacket body is inserted into the blind hole, the flange end cover is located outside the blind hole, and the flange end cover is provided with a water inlet and a water outlet.

[0009] Furthermore, the hollow cylinder and the flange end cover are connected by bolts, and a gasket is provided between the hollow cylinder and the flange end cover.

[0010] Furthermore, the length direction of the hollow cylinder and the depth direction of the blind hole are both arranged in the horizontal direction; and the water outlet and the water inlet are at different heights above the ground.

[0011] Furthermore, the hollow cylinder is cylindrical, and the water outlet and the water inlet are respectively located on the upper side and the lower side of the central axis of the hollow cylinder.

[0012] Furthermore, the cooling water jacket body also includes a water inlet pipe and a water outlet pipe, the water inlet pipe extends into the interior of the hollow cylinder near the closed end through the water inlet, and the water outlet pipe is connected to the interior of the hollow cylinder through the water outlet.

[0013] Furthermore, the hollow cylinder is made of a seamless steel pipe with one end sealed, and an anti-corrosion layer is provided on the outer surface of the hollow cylinder.

[0014] Furthermore, the outer surface of the hollow cylinder is provided with a limiting structure extending along its length direction.

[0015] Furthermore, the resin layer material is epoxy resin.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The graphitization furnace electrode cooling structure provided by the present invention comprises a cooling water jacket body and a resin layer, wherein the cooling water jacket body is inserted into the blind hole at the end of the electrode to directly cool the inside of the electrode; the resin layer fills the gap between the cooling water jacket body and the electrode, and forms a resin jacket layer structure on the surface of the cooling water jacket body, which can not only avoid oxidation of the electrode caused by contact with water due to leakage of the cooling water jacket, but also enhance the strength of the contact surface and reduce vibration, torsion, displacement and the like in the working state; the water jacket body is an independent structure, which is easy to replace, and effectively avoids the problem of difficult maintenance after damage or scale deposition.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic cross-sectional structure diagram of Example 1 of the present application;

[0021] Figure 2 This is a schematic cross-sectional structure diagram of Example 2 of the present application;

[0022] Figure 3 for Figure 2 AA surface view in.

[0023] Description of the drawings: 10 - water jacket body, 11 - hollow cylinder, 12 - flange end cover, 13 - gasket, 14 - water outlet, 15 - water inlet, 16 - water outlet pipe, 17 - water inlet pipe, 18 - limiting structure, 20 - resin layer, 30 - electrode. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] Example 1

[0026] One embodiment of the present application provides a cooling structure for graphitization furnace electrodes, see Figure 1 ,include:

[0027] The cooling water jacket body 10 and the resin layer 20 are inserted into the blind hole at the end of the electrode 30 when in use, and the resin layer 20 is arranged on the outer surface of the cooling water jacket body 10. When the cooling water jacket body 10 is inserted into the blind hole of the electrode 30, the resin layer 20 contacts the bottom and side wall of the blind hole. The outer diameter of the cooling water jacket body 10 and the diameter of the blind hole are clearance-matched; the resin layer 20 fills the gap between the cooling water jacket body 10 and the blind hole.

[0028] In this embodiment, the cooling water jacket body is inserted into the blind hole at the end of the electrode when in use, and the cooling water circulating in the cooling water jacket body directly cools the inside of the electrode; the resin layer fills the gap between the water jacket body and the electrode, which can not only avoid the electrode from contacting and oxidizing with water due to leakage of the cooling water jacket, but also make the electrode and the cooling water jacket in closer contact, thereby reducing the vibration, torsion, displacement, etc. of the cooling water jacket in the working state.

[0029] In some embodiments, the material of the resin layer can be an elastic adhesive material, such as a film layer formed by butyl rubber water or chloroprene rubber adhesive, and its thickness is 1mm to 2mm; the outer diameter of the cooling water jacket is interference fit with the blind hole, and the gap between the contact surface of the cooling water jacket body and the electrode blind hole is completely filled through the deformation of butyl rubber water or chloroprene rubber adhesive, thereby preventing air or water vapor from entering the electrode blind hole. At the same time, the resin layer is a complete sleeve structure that is sleeved on the surface of the cooling water jacket body, which can prevent water from contacting the electrode due to rupture and leakage of the cooling water jacket body, avoid electrode corrosion, and extend the service life of the electrode.

[0030] In other embodiments, the material of the resin layer may also be a semi-solid resin material that is re-solidified to form a film layer on the surface of the cooling water jacket body, which facilitates the control of the thickness, thickness uniformity and integrity of the resin layer, and is also conducive to maintaining the bonding state between the resin layer and the electrode blind hole. The re-solidification process of the film layer may be solidified by other heat sources or solidification methods before the electrode works, or may be solidified by the heat generated when the electrode works.

[0031] In addition, in other embodiments, the resin layer can also be formed by curing a liquid or nearly liquid resin material solution on the surface of the cooling water jacket body to form a film layer, and the curing temperature of the selected resin material is 15-20° C. The curing process of the film layer can be room temperature curing before the electrode works, or it can be quickly cured by other heat sources or curing methods, or it can be quickly cured by the heat generated when the electrode works.

[0032] When it is cured at room temperature, the curing method can be: apply a liquid or nearly liquid resin material solution on the surface of the cooling water jacket body, and then place it in a room temperature environment for static curing for a certain period of time, such as 24 hours, to make it solidify. In this embodiment, the material of the resin layer 20 can be any resin in the prior art with a heat-resistant temperature of not less than 180°C and a curing temperature of 14-20°C, such as epoxy resin.

[0033] When the resin layer is formed by solidifying a liquid resin material solution, the resin layer is coated on the surface of the cooling water jacket body at room temperature in a non-working state to form a liquid film; then the cooling water jacket body coated with the liquid film is inserted into the blind hole and solidified to form a cooling water jacket with a resin layer on the cooling water jacket body.

[0034] In other embodiments, the cooling water jacket with a resin layer on the cooling water jacket body can also be formed by the following method: the electrode is placed vertically, the axis of the blind hole of the electrode is perpendicular to the ground, and then the prepared liquid resin material solution is poured into the blind hole of the electrode, and then the cooling water jacket body is inserted into the blind hole of the electrode, and a certain pressure is applied to the open end of the cooling water jacket body to fill the resin in the hole along the gap between the outer wall of the cooling water jacket body and the hole wall and overflow. After the resin is solidified at room temperature (for example, about 24 hours), the electrode can be laid flat again, and then the furnace can be loaded.

[0035] In this embodiment, the water jacket body is inserted into the blind hole along its length direction, the length of the water jacket body 10 is greater than the depth of the blind hole, and the difference between the length of the water jacket body 10 and the depth of the blind hole is not less than 5 cm; it not only improves the convenience of installation and replacement of the cooling water jacket body, but also can reduce the dimensional tolerance of the cooling water jacket and the electrode blind hole depth, the installation of the water supply pipeline and other problems.

[0036] In this embodiment, the cooling water jacket body 10 includes a cylindrical hollow cylinder 11 with one end closed and the other end open, and a flange end cover 12. The open end of the hollow cylinder cooperates with the flange end cover to form a closed space. The flange end cover is provided with a water inlet 15 and a water outlet 14.

[0037] In this embodiment, in the working state, the length direction of the hollow cylinder 11 and the depth direction of the blind hole are both arranged in the horizontal direction; the water outlet 14 and the water inlet 15 are arranged one above and one below the hollow cylinder 11, and the heights from the ground are different.

[0038] Preferably, the hollow cylinder 11 is cylindrical, the water outlet 14 is located on the upper side of the horizontal axis section of the hollow cylinder, and the water inlet 15 is located on the lower side of the horizontal axis section of the hollow cylinder, so that cooling water enters from the water inlet 15 below and flows out from the water outlet 14 above, thereby improving the cooling effect.

[0039] In this embodiment, the closed space formed by the hollow cylinder and the flange end cover can accommodate cooling water, and the cooling water heated up due to heat exchange with the electrode 30 can be circulated through the water inlet 15 and the water outlet 14 provided on the flange end cover to avoid heat accumulation.

[0040] Preferably, the hollow cylinder 11 and the flange end cover 12 can be connected by any existing fasteners or fastening structures, such as threaded connection or bolted connection. Preferably, bolted connection is used, which can avoid the radial torque caused by rotation when installing / removing the flange end cover 12 due to threaded connection, which has an adverse effect on the bonding between the water jacket and the electrode, and further affects the connection between the cooling water jacket body and the electrode. In some preferred embodiments, a gasket 13 is also included between the hollow cylinder 11 and the flange end cover 12 to improve the sealing of the connection between the flange end cover and the hollow cylinder.

[0041] In this embodiment, the cooling water jacket body 10 also includes an inlet pipe 17 and an outlet pipe 16. The inlet pipe 17 extends into the interior of the hollow cylinder 11 near the closed end through the water inlet 15. The direction of the inlet pipe 17 is parallel to the length direction of the hollow cylinder 11; the outlet pipe 16 is connected to the interior of the hollow cylinder 11 through the water outlet 14. The inlet pipe 17 extends into the interior of the hollow cylinder 11 for a long time, and can directly introduce cooling water with a lower temperature into the inside of the hollow cylinder 11, thereby improving the cooling efficiency. The outlet pipe 16 is connected to the outlet 14, which can better avoid the formation of a dead zone of water flow at the outlet 14 and improve the heat exchange efficiency.

[0042] In this embodiment, the water inlet pipe 17 and the water outlet pipe 16 are arranged in parallel along the length direction of the cooling water jacket body 10 .

[0043] In this embodiment, the water inlet pipe 17 and the water outlet pipe 16 can also be independently connected to a water pump.

[0044] In this embodiment, the water jacket body 10 further includes a heat exchanger, and the water inlet pipe 17 and the water outlet pipe 16 are connected to the heat exchanger.

[0045] In this embodiment, the material of the hollow cylinder 11 is a seamless steel pipe, and the outer surface of the hollow cylinder 11 is provided with an anti-corrosion layer.

[0046] During specific use, the user first connects the water inlet pipe 17 to a water source. At this time, the water source flows in the cooling water jacket body 10 and takes away the heat of the electrode 30. The water source is discharged through the water outlet pipe 16 to reduce the temperature of the electrode 30.

[0047] Example 2

[0048] See also Figure 2 , Figure 3This embodiment provides the following technical solution based on the embodiment 1: a raised limiting structure 18 is provided on the surface of the hollow cylinder along the length direction, and a limiting groove matching the limiting structure is provided on the side wall of the blind hole, so that the limiting structure and the limiting groove form a structure similar to a bite. The raised limiting structure is convenient for installation and positioning, and also avoids displacement and twisting caused by external forces during use, which damages the resin layer structure and reduces the cooling effect. Among them, the extension length of the limiting structure and the limiting groove can be equal to the depth of the blind hole, or can be less than the depth of the blind hole. When the extension length of the limiting groove is less than the depth of the blind hole, the limiting groove extends from the opening end of the blind hole to the bottom.

[0049] In this embodiment, the number of the limiting structures 18 is greater than or equal to 1; when the number of the limiting structures is greater than 1, their distribution is centrally symmetrical.

[0050] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A cooling structure for graphitization furnace electrodes, characterized in that: A blind hole is provided at the end of the graphitization furnace electrode located outside the graphitization furnace, and the cooling structure includes a cooling water jacket body and a resin layer, wherein the resin layer is arranged on the outer surface of the cooling water jacket body, and the cooling water jacket body is inserted into the blind hole of the graphitization electrode, and the resin layer is in contact with the bottom and side wall of the blind hole.

2. The cooling structure for graphitization furnace electrodes according to claim 1, characterized in that: The water jacket body is inserted into the blind hole along its length direction, the length of the water jacket body is greater than the depth of the blind hole, and the difference between the length of the water jacket body and the depth of the blind hole is not less than 5 cm.

3. A cooling structure for graphitization furnace electrodes according to claim 1 or 2, characterized in that: The cooling water jacket body includes a hollow cylinder with one end closed and the other end open, and a flange end cover. The open end of the hollow cylinder cooperates with the flange end cover to form a closed space. The closed end of the cooling water jacket body is inserted into the blind hole, and the flange end cover is located outside the blind hole. The flange end cover is provided with a water inlet and a water outlet.

4. The cooling structure for graphitization furnace electrodes according to claim 3, characterized in that: The hollow cylinder and the flange end cover are connected by bolts, and a gasket is arranged between the hollow cylinder and the flange end cover.

5. The cooling structure for graphitization furnace electrodes according to claim 3, characterized in that: The length direction of the hollow cylinder and the depth direction of the blind hole are both arranged in the horizontal direction; the water outlet and the water inlet have different heights above the ground.

6. A cooling structure for graphitization furnace electrodes according to claim 5, characterized in that: The hollow cylinder is cylindrical, and the water outlet and the water inlet are respectively located on the upper side and the lower side of the central axis of the hollow cylinder.

7. The cooling structure for graphitization furnace electrodes according to claim 3, characterized in that: The cooling water jacket body further comprises a water inlet pipe and a water outlet pipe. The water inlet pipe extends into the interior of the hollow cylinder near the closed end through the water inlet, and the water outlet pipe is communicated with the interior of the hollow cylinder through the water outlet.

8. The cooling structure for graphitization furnace electrodes according to claim 3, characterized in that: The hollow cylinder is a seamless steel pipe with one end sealed, and an anti-corrosion layer is arranged on the outer surface of the hollow cylinder.

9. The cooling structure for graphitization furnace electrodes according to claim 3, characterized in that: The outer surface of the hollow cylinder is provided with a limiting structure extending along the length direction thereof.

10. The cooling structure for graphitization furnace electrodes according to claim 1, characterized in that: The resin layer is an epoxy resin layer.

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