Graphite electrode structure

Abstract

The utility model relates to a graphite electrode structure, and belongs to the technical field of graphite electrodes. The graphite electrode assembly comprises a graphite reducer union, a graphite screw rod, a graphite joint and a graphite electrode, a first internal threaded hole and a second internal threaded hole are formed in the graphite reducer union, the first internal threaded hole is formed above the second internal threaded hole, the diameter of the first internal threaded hole is larger than that of the second internal threaded hole, and the first internal threaded hole is in threaded connection with an external thread of a copper rod; the upper end of the graphite screw rod is in threaded connection with the second inner threaded hole; the graphite joint is provided with an internal thread and is in threaded connection with the lower end of the graphite screw rod, so that the upper end surface of the graphite joint is propped against the lower end surface of the graphite reducing joint; the graphite electrode comprises an upper end part and a body part, the body part is arranged below the upper end part, the upper end part is provided with an external thread, the external thread of the upper end part is in threaded connection with the internal thread of the graphite joint, and the body part is used for discharging. The graphite electrode has the effect of improving the problem that the graphite electrode is prone to arc breaking.

Description

Technical Field

[0001] This application relates to the field of graphite electrode technology, and in particular to a graphite electrode structure. Background Technology

[0002] Quartz crucibles are commonly used consumables in the production of Czochralski single crystal silicon and require frequent production. Currently, in existing technologies, graphite electrodes are typically connected directly to the bottom of a copper rod in a heating device via graphite connectors. The heating device energizes the graphite electrodes, causing them to discharge and heat the quartz sand in the mold, thereby softening the quartz sand and shaping it into a quartz crucible.

[0003] However, during the processing of quartz crucibles, the high-purity graphite material is subjected to significant vibration and impact due to the large vibration of the heating equipment and the vibration generated by the electromagnetic field. If the graphite electrode is uneven in texture or has defects, the electrode is prone to breakage, resulting in arc interruption during melting.

[0004] Among the aforementioned related technologies, there is a defect that graphite electrodes are prone to arc breakage. Utility Model Content

[0005] To address the issue of arc breakage in graphite electrodes, this application provides a graphite electrode structure.

[0006] The graphite electrode structure provided in this application adopts the following technical solution:

[0007] A graphite electrode structure for connecting to a copper rod in a heating device includes: a graphite reducing connector, wherein the reducing connector has a first internal threaded hole and a second internal threaded hole, the first internal threaded hole being located above the second internal threaded hole, the diameter of the first internal threaded hole being larger than the diameter of the second internal threaded hole, and the first internal threaded hole being screwed into the external thread of the copper rod; a graphite lead screw, the upper end of which is screwed into the second internal threaded hole; a graphite connector, the graphite connector having an internal thread, the graphite connector being screwed into the lower end of the graphite lead screw, such that the upper end face of the graphite connector abuts against the lower end face of the graphite reducing connector; and a graphite electrode, the graphite electrode including an upper end and a body portion, the body portion being located below the upper end, the upper end having an external thread, the external thread of the upper end being screwed into the internal thread of the graphite connector, and the body portion being used for discharge.

[0008] By adopting the above technical solution, the external thread of the copper rod is screwed into the first internal thread hole, the upper end of the graphite screw is screwed into the second internal thread hole, and the lower end of the graphite screw is screwed into the graphite connector. The graphite connector can also be screwed into the upper end of the graphite electrode. Thus, by adding the graphite reducer and the graphite screw, the copper rod, the graphite connector, and the graphite electrode are connected, enabling the body to discharge and complete the heating and forming of the quartz crucible. Due to the addition of the graphite reducer and the graphite connector to form a combined connector structure, the overall volume and weight of the electrode structure can be increased, thereby mitigating the influence of lateral loads caused by vibration, helping to improve stability, reduce amplitude, and thus reduce the risk of arc breakage caused by vibration and reduce the arc breakage rate of the graphite electrode.

[0009] Optionally, the graphite reducer is provided with a clearance groove, which is located between the first internal threaded hole and the second internal threaded hole along the axial direction of the graphite reducer.

[0010] By adopting the above technical solution, the setting of the clearance groove creates a gap between the first internal threaded hole and the second internal threaded hole, so that the clearance groove can provide space for thermal expansion and contraction for both the copper rod and the graphite screw at the same time, thereby alleviating the problem of thermal expansion and contraction caused by temperature changes due to frequent changes in current during the arc melting process, which in turn damages the graphite electrode.

[0011] Optionally, the diameter of the clearance groove is larger than the diameter of the first internal threaded hole.

[0012] By adopting the above technical solution, sufficient space for thermal expansion and contraction can be provided for both the copper rod and the graphite screw.

[0013] Optionally, the outer diameter of the graphite reducing joint is in the range of 60mm-80mm.

[0014] By adopting the above technical solution and setting a larger graphite reducing joint, the overall weight and volume of the electrode structure can be increased, thereby mitigating the impact of vibration.

[0015] Optionally, the outer diameter of the upper end of the graphite electrode is in the range of 42mm-50mm.

[0016] By adopting the above technical solution, the outer diameter of the upper end of the graphite electrode is increased, and the structural strength is improved, thereby reducing the risk of cracking of the upper end under the action of thermal expansion and contraction.

[0017] Optionally, the body portion includes a cylindrical segment and a frustum segment. The upper end of the cylindrical segment is connected to the upper end, and the frustum segment is located below the cylindrical segment. From the upper end to the frustum segment, the diameter of the frustum segment gradually decreases, such that the diameter of the frustum segment away from the bottom surface of the cylindrical segment is smaller than the diameter of the frustum segment near the bottom surface of the cylindrical segment.

[0018] By adopting the above technical solution, a frustum section is set at the lower end of the cylindrical section. The side of the frustum section is inclined relative to the axis, which increases the contact range between the graphite electrodes during arc initiation. This reduces the risk of arc breakage caused by the graphite electrodes being too close together and interfering with each other when opening and closing during arc initiation or melting process.

[0019] Optionally, the angle between the side of the frustum segment and the vertical direction is in the range of 3°-4°.

[0020] By adopting the above technical solution, it is helpful to make the current conduction of graphite electrodes uniform and improve the heat dissipation effect.

[0021] Optionally, the length of the busbar of the frustum segment ranges from 150mm to 200mm.

[0022] By adopting the above technical solution, it is helpful to increase the spacing between graphite electrodes and reduce the mutual influence between graphite electrodes when they are opened and closed.

[0023] Optionally, the body portion includes an arc-shaped end, which is connected to the bottom surface of the frustum segment away from the cylindrical segment, so that the lower end surface of the graphite electrode is an arc-shaped surface.

[0024] By adopting the above technical solutions, it is helpful to achieve uniform current conduction and improve discharge stability.

[0025] Optionally, the length of the graphite electrode ranges from 500mm to 700mm.

[0026] By adopting the above technical solution, the graphite electrode is shortened in length relative to the original structure due to the addition of a graphite reducing connector and a graphite lead screw, thereby reducing the cost of using the graphite electrode.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The external thread of the copper rod is screwed into the first internal thread hole, the upper end of the graphite screw is screwed into the second internal thread hole, and the lower end of the graphite screw is screwed into the graphite connector. The graphite connector can also be screwed into the upper end of the graphite electrode. Thus, by adding the graphite reducer and the graphite screw, the copper rod, the graphite connector and the graphite electrode are connected, enabling the body to discharge and complete the heating and forming of the quartz crucible. Due to the addition of the graphite reducer and the graphite connector to form a combined connector structure, the overall volume and weight of the electrode structure can be increased, thereby mitigating the influence of lateral loads caused by vibration, helping to improve stability, reduce amplitude, and thus reduce the risk of arc breakage caused by vibration and reduce the arc breakage rate of the graphite electrode.

[0029] 2. The clearance groove creates a gap between the first internal threaded hole and the second internal threaded hole, thereby providing space for thermal expansion and contraction for both the copper rod and the graphite screw. This alleviates the problem of thermal expansion and contraction caused by temperature changes due to frequent changes in current during the arc-starting melting process, which can lead to damage to the graphite electrode.

[0030] 3. A frustum section is provided at the lower end of the cylindrical section. The side of the frustum section, which is inclined relative to the axis, increases the contact range between the graphite electrodes during arc initiation. This reduces the risk of arc breakage caused by the graphite electrodes being too close together and interfering with each other when opening and closing during arc initiation or melting. Attached Figure Description

[0031] Figure 1 This is an exploded view of a partial cross-section of the graphite electrode structure according to an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Graphite reducing connector; 11. First internal threaded hole; 12. Second internal threaded hole; 13. Clearance groove; 2. Graphite lead screw; 3. Graphite connector; 4. Graphite electrode; 41. Upper end; 42. Body; 421. Cylindrical section; 422. Frustum section; 423. Arc end. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1 This application will be further described in detail below. In this embodiment, unless otherwise specified, "connection", "linking", and "fixing" are interpreted broadly, including fixed connection, detachable connection, connection to form an integral structure, mechanical connection, electrical connection, direct connection, indirect connection through an intermediary, internal connection, and interaction between two components, etc., and can be understood according to the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, in the description of this embodiment, terms such as "above," "below," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for ease of description and simplification of operation, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise stated, directional terms such as "inner" and "outer" used in this application refer to the outline of the corresponding component itself.

[0036] like Figure 1As shown in the figure, this application discloses a graphite electrode structure (hereinafter referred to as "electrode structure"). The electrode structure includes a graphite reducing connector 1, a graphite lead screw 2, a graphite connector 3, and a graphite electrode 4, which are used to connect with a copper rod of a heating device to realize the electrical discharge machining of a quartz crucible.

[0037] The graphite reducer 1 has a first internal threaded hole 11 and a second internal threaded hole 12. The first internal threaded hole 11 is located above the second internal threaded hole 12, and the diameter of the first internal threaded hole 11 is larger than the diameter of the second internal threaded hole 12. The first internal threaded hole 11 is screwed into the external thread of the copper rod, and the upper end of the graphite screw 2 is screwed into the second internal threaded hole 12. The graphite connector 3 has an internal thread, and the upper part of the graphite connector 3 is screwed into the lower end of the graphite screw 2, so that the upper end face of the graphite connector 3 abuts against the lower end face of the graphite reducer 1, forming a combined connector structure. The graphite electrode 4 includes an upper end portion 41 and a body portion 42, which are arranged vertically. The body portion 42 is located below the upper end portion 41. The upper end portion 41 has an external thread, and the external thread of the upper end portion 41 is screwed into the lower part of the internal thread of the graphite connector 3, so that the graphite connector 3 is located above the graphite electrode 4. The body portion 42 is used for discharge.

[0038] like Figure 1 As shown, the external thread of the copper rod is screwed into the first internal thread hole 11, the upper end of the graphite screw 2 is screwed into the second internal thread hole 12, and the lower end of the graphite screw 2 is screwed into the graphite connector 3. The graphite connector 3 can also be screwed into the upper end 41 of the graphite electrode 4. Thus, by adding the graphite reducer connector 1 and the graphite screw 2, the copper rod, graphite connector 3, and graphite electrode 4 are connected, enabling the body 42 to discharge and complete the heating and forming of the quartz crucible. The combined connector structure formed by the abutment of the graphite reducer connector 1 and the graphite connector 3 increases the overall volume and weight of the electrode structure, which helps improve stability, mitigates the lateral load caused by vibration, reduces amplitude, and thus reduces the risk of arc breakage caused by vibration, thereby reducing the arc breakage rate of the graphite electrode 4.

[0039] Optionally, the outer diameter of the graphite reducing connector 1 is in the range of 60mm-80mm, and the outer diameter of the graphite reducing connector 1 is larger than the diameter of the graphite electrode 4. By setting the graphite reducing connector 1 with a larger outer diameter, it helps to increase the overall weight and volume of the electrode structure, thereby mitigating the impact of vibration and improving seismic resistance.

[0040] like Figure 1As shown, optionally, the graphite reducer 1 is provided with a clearance groove 13. Along the axial direction of the graphite reducer 1, the clearance groove 13 is located between the first internal threaded hole 11 and the second internal threaded hole 12. The clearance groove 13 creates a gap between the first internal threaded hole 11 and the second internal threaded hole 12, thus providing space for both the copper rod and the graphite lead screw 2 to expand and contract with temperature. This alleviates the problem of thermal expansion and contraction caused by frequent changes in current during arc melting, which can damage the graphite electrode 4. The diameter of the clearance groove 13 is larger than the diameter of the first internal threaded hole 11, helping to provide sufficient space for thermal expansion and contraction for both the copper rod and the graphite lead screw 2. The clearance groove 13 is a relief groove, providing deformation space for thermal expansion and contraction of the copper rod and the graphite lead screw 2. Under normal circumstances, neither the copper rod nor the graphite lead screw 2 extends into the clearance groove 13. Optionally, the outer diameter of the upper end 41 of the graphite electrode 4 ranges from 42mm to 50mm. Increasing the outer diameter of the upper end 41 of the graphite electrode 4 can improve the structural strength, thereby reducing the risk of cracking of the upper end 41 under the action of thermal expansion and contraction.

[0041] Optionally, the length of the graphite electrode 4 ranges from 500mm to 700mm. By adding the graphite reducing connector 1 and the graphite lead screw 2, the length of the graphite electrode 4 is shortened compared to the original structure, reducing the cost of using the graphite electrode 4. Simultaneously, the shortened length of the graphite electrode 4 helps reduce its oscillation amplitude, facilitating precise control of the electrode opening and closing distance during the melting process, i.e., the distance between two adjacent graphite electrodes 4, thus improving the stability of the melting process.

[0042] like Figure 1As shown, optionally, the body portion 42 includes a cylindrical section 421 and a frustum section 422. The upper end of the cylindrical section 421 is connected to the upper end portion 41, and the frustum section 422 is located below the cylindrical section 421. From the upper end portion 41 to the frustum section 422, the diameter of the frustum section 422 gradually decreases, such that the diameter of the frustum section 422 away from the bottom surface of the cylindrical section 421 is smaller than the diameter of the frustum section 422 near the bottom surface of the cylindrical section 421. The frustum section 422 is located at the lower end of the cylindrical section 421. The inclined side of the frustum section 422 relative to the axis increases the contact range between the graphite electrodes 4 during arc initiation, reducing the risk of arc breakage due to mutual interference between adjacent graphite electrodes 4 during arc initiation or melting processes. The angle between the side of the frustum section 422 and the vertical direction is in the range of 3°-4°, which helps to ensure uniform current conduction of the graphite electrodes 4 and improves heat dissipation. The busbar length of the frustum section 422 ranges from 150mm to 200mm, which helps to increase the contact range between the graphite electrodes 4 and reduce the mutual influence when the graphite electrodes 4 are opened and closed. In this embodiment, the outer diameter of the graphite reducing connector 1 is larger than the diameter of the cylindrical section 421, which facilitates increasing the overall volume and weight by setting the graphite reducing connector 1.

[0043] like Figure 1 As shown, optionally, the body portion 42 includes an arc-shaped end 423. The arc-shaped end 423 is connected to the bottom surface of the frustum section 422 away from the cylindrical section 421, making the lower end surface of the graphite electrode 4 an arc surface, which helps to achieve uniform current conduction and improve discharge stability.

[0044] According to experimental analysis, the arc-breaking rate of the original electrode structure exceeded 23%, while the arc-breaking rate of the electrode structure in this embodiment is below 9%, indicating that the electrode structure has a lower arc-breaking rate and can improve melting stability. It is understood that the electrode structure also includes necessary structures for connection, driving, support, positioning, and limiting functions to ensure normal operation. The shape, size, material, and quantity of each part of the electrode structure can be determined as needed to achieve the corresponding functions. This embodiment mainly protects the electrode structure; the principle and process of discharge achieved by the electrode structure already have relevant technologies and will not be elaborated here.

[0045] The implementation principle of a graphite electrode structure in this application embodiment is as follows: the external thread of the copper rod is screwed into the first internal thread hole 11, the upper end of the graphite screw 2 is screwed into the second internal thread hole 12, and the lower end of the graphite screw 2 is screwed into the graphite connector 3. The graphite connector 3 can also be screwed into the upper end 41 of the graphite electrode 4. Thus, by adding the graphite reducer connector 1 and the graphite screw 2, the copper rod, the graphite connector 3 and the graphite electrode 4 are connected, enabling the body part 42 to discharge and complete the heating and forming of the quartz crucible. Due to the addition of the combined connector structure formed by the graphite reducer connector 1 and the graphite connector 3 abutting each other, the overall volume and weight of the electrode structure can be increased, thereby mitigating the influence of lateral loads caused by vibration, helping to improve stability, reduce amplitude, thereby reducing the risk of arc breakage caused by vibration, reducing the arc breakage rate of the graphite electrode 4, and improving melting stability.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A graphite electrode structure, characterized in that, The graphite electrode structure includes components for connection to a copper rod in a heating device: A graphite reducing connector (1) is provided with a first internal threaded hole (11) and a second internal threaded hole (12). The first internal threaded hole (11) is located above the second internal threaded hole (12). The diameter of the first internal threaded hole (11) is larger than the diameter of the second internal threaded hole (12). The first internal threaded hole (11) is screwed to the external thread of a copper rod. Graphite screw (2), the upper end of which is screwed into the second internal thread hole (12); Graphite connector (3), the graphite connector (3) is provided with internal thread, the graphite connector (3) is screwed to the lower end of the graphite screw (2), so that the upper end face of the graphite connector (3) abuts against the lower end face of the graphite reducer (1); The graphite electrode (4) includes an upper end (41) and a body (42). The body (42) is located below the upper end (41). The upper end (41) is provided with an external thread. The external thread of the upper end (41) is screwed into the internal thread of the graphite connector (3). The body (42) is used for discharge.

2. The graphite electrode structure according to claim 1, characterized in that, The graphite reducer (1) is provided with a relief groove (13), which is located between the first internal threaded hole (11) and the second internal threaded hole (12) along the axial direction of the graphite reducer (1).

3. The graphite electrode structure according to claim 2, characterized in that, The diameter of the clearance groove (13) is larger than the diameter of the first internal threaded hole (11).

4. The graphite electrode structure according to claim 1, characterized in that, The outer diameter range of the graphite reducing connector (1) is 60mm-80mm.

5. The graphite electrode structure according to claim 1, characterized in that, The outer diameter of the upper end (41) of the graphite electrode (4) ranges from 42mm to 50mm.

6. The graphite electrode structure according to claim 1, characterized in that, The main body (42) includes a cylindrical section (421) and a frustum section (422). The upper end of the cylindrical section (421) is connected to the upper end (41). The frustum section (422) is located below the cylindrical section (421). From the upper end (41) to the frustum section (422), the diameter of the frustum section (422) gradually decreases, so that the diameter of the frustum section (422) away from the bottom surface of the cylindrical section (421) is smaller than the diameter of the frustum section (422) close to the bottom surface of the cylindrical section (421).

7. The graphite electrode structure according to claim 6, characterized in that, The angle between the side of the frustum segment (422) and the vertical direction is in the range of 3°-4°.

8. The graphite electrode structure according to claim 6, characterized in that, The length of the busbar of the frustum section (422) ranges from 150mm to 200mm.

9. The graphite electrode structure according to claim 6, characterized in that, The main body (42) includes an arc end (423), which is connected to the bottom surface of the frustum section (422) away from the cylindrical section (421), so that the lower end surface of the graphite electrode (4) is an arc surface.

10. The graphite electrode structure according to claim 1, characterized in that, The length of the graphite electrode (4) ranges from 500mm to 700mm.

Images