Graphite electrode and heating device
By designing an obtuse-angled structure and tilting setting for the graphite electrode, the problem of uneven heating of the quartz crucible was solved, achieving uniform heating and efficient preparation of the quartz crucible.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-04-07
AI Technical Summary
The existing graphite electrode only arcs at the lower end, resulting in uneven heating of the quartz crucible and making it difficult to ensure the uniformity of the quartz crucible wall thickness.
The first and second electrode pillars of the graphite electrode are designed with obtuse angles along their axes. By vertically aligning the first electrode pillars and tilting the second electrode pillars of several graphite electrodes, a large heating area is formed, ensuring that the entire graphite electrode extends into the quartz crucible for heating.
Uniform heating of the quartz crucible was achieved, improving the thickness uniformity and surface flatness of the quartz crucible and increasing the preparation efficiency.
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Figure CN224097875U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electrode technology, and in particular to a graphite electrode and a heating device. Background Technology
[0002] Quartz crucibles are crucial containers for holding molten silicon during the preparation of single-crystal silicon. To prepare a quartz crucible, the various layers of the crucible are first arranged sequentially within an alloy steel mold. Then, a heating device is used to heat each layer to obtain the desired quartz crucible. The heating device can include several graphite electrodes, which can be arranged in a circumferential array. Each graphite electrode can be tilted and extend in a straight line. The lower ends of the graphite electrodes are close to each other to facilitate arcing between them, thereby heating the layers of the quartz crucible. The upper ends of the graphite electrodes are spaced apart to prevent arcing when the graphite electrodes are connected to copper electrodes. However, the graphite electrodes can only generate an arc at the lower end, and the heating area they form is relatively small. When preparing the quartz crucible, the heating area formed at the lower end needs to be moved from top to bottom to heat each part of the quartz crucible in turn. This can easily lead to uneven heating of the quartz crucible in different parts, making it difficult to ensure the uniformity of the wall thickness of the quartz crucible. Utility Model Content
[0003] Based on this, this application provides a graphite electrode and a heating device to improve the problem in the prior art that the graphite electrode only arcs at the lower end, making it difficult to uniformly heat the layer structure of the quartz crucible.
[0004] In a first aspect, this application provides a graphite electrode, which includes a first electrode post and a second electrode post, wherein the upper end of the first electrode post is connected to the lower end of the second electrode post, and the axis of the first electrode post and the axis of the second electrode post are set at an obtuse angle.
[0005] In one embodiment, the angle between the axis of the first electrode post and the axis of the second electrode post is 120-170 degrees.
[0006] In one embodiment, the first electrode post is threadedly connected to the second electrode post.
[0007] In one embodiment, the upper end of the first electrode post is provided with a first end face, the first end face is provided with a protruding first threaded post, the lower end of the second electrode post is provided with a second end face, the second end face is provided with a recessed first threaded hole, the first threaded post is connected to the first threaded hole, and the first end face coincides with the second end face.
[0008] Secondly, this application provides a heating device for preparing a quartz crucible. The heating device includes any type of graphite electrode provided in this application. The first electrode posts of a plurality of graphite electrodes are all vertically arranged and spaced apart along the circumference. The second electrode posts of a plurality of graphite electrodes are inclined in a direction away from the central axis of the circumference. The maximum distance between the first electrode posts of the plurality of graphite electrodes is less than a first predetermined distance, and the minimum distance between the second electrode posts of the plurality of graphite electrodes is greater than a second predetermined distance. The first predetermined distance is the maximum distance for arc initiation, and the second predetermined distance is the minimum distance for no arc initiation.
[0009] In one embodiment, the heating device further includes a plurality of metal electrodes, the lower end of each metal electrode being connected to the upper end of the second electrode post of each graphite electrode.
[0010] In one embodiment, the lower end of the metal electrode is threadedly connected to the upper end of the second electrode post of the corresponding graphite electrode.
[0011] In one embodiment, the outer diameter of the first electrode post is equal at all points along its axial direction.
[0012] In one embodiment, the outer diameter of the second electrode post is equal at all points along its axial direction.
[0013] In one embodiment, the heating device heats the crucible, and the length of the first electrode post is greater than 70% of the depth of the crucible.
[0014] This application sets the graphite electrodes as first and second electrode posts with obtuse angles along their axes. When heating a quartz crucible by igniting an arc with several graphite electrodes, the axes of the first electrode posts of the graphite electrodes can all be set vertically, and the second electrode posts of the graphite electrodes can all extend along a direction away from the central axis of the circumferential array of the graphite electrodes. This allows for arcing at multiple axial positions of the first electrode posts of the graphite electrodes, while avoiding arcing between the metal electrodes, thus forming a relatively large heating area. Furthermore, during the heating of the quartz crucible, the entire length of the first electrode posts of the graphite electrodes can be inserted into the quartz crucible to simultaneously heat all parts of the quartz crucible, thereby avoiding the problem of uneven heating of the quartz crucible. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the graphite electrode provided in Embodiment 1 of this application;
[0016] Figure 2 This is a schematic diagram of the heating device provided in Embodiment 2 of this application;
[0017] Figure 3 This is a schematic diagram of the heating device provided in Embodiment 2 of this application during the preparation of a quartz crucible;
[0018] Figure 4 A front view of the graphite electrode provided in Embodiment 1 of this application;
[0019] Figure 5 A front view of a graphite electrode provided in another embodiment of this application;
[0020] Figure 6 This is an exploded view of the graphite electrode provided in Embodiment 1 of this application.
[0021] Reference numerals: 100, graphite electrode; 110, first electrode post; 111, first end face; 120, second electrode post; 121, second end face; 200, metal electrode; 300, layer structure; 400, alloy steel mold. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0023] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model.
[0024] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0025] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "transverse," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not 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 limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0026] Example 1
[0027] Embodiment 1 of this application provides a graphite electrode 100, such as... Figures 1 to 6As shown, the graphite electrode 100 includes a first electrode post 110 and a second electrode post 120. The upper end of the first electrode post 110 is connected to the lower end of the second electrode post 120, and the axis of the first electrode post 110 and the axis of the second electrode post 120 are set at an obtuse angle.
[0028] like Figure 1 As shown in this embodiment, the graphite electrode 100 may include two electrode posts, namely a first electrode post 110 and a second electrode post 120. The upper end of the first electrode post 110 may be connected to the lower end of the second electrode post 120, wherein the first electrode post 110 may be used as the lower half of the graphite electrode 100; and the second electrode post 120 may be used as the upper half of the graphite electrode 100. The axis of the first electrode post 110 and the axis of the second electrode post 120 may be set at an obtuse angle, so that the upper half of the graphite electrode 100 may be bent relative to the lower half.
[0029] like Figure 2 and Figure 3 As shown, in this embodiment, the graphite electrode 100 can be used in a heating device, which can be used to prepare a quartz crucible. The heating device may include a plurality of graphite electrodes 100; this embodiment uses six graphite electrodes 100 as an example. Of course, in some embodiments, the number of graphite electrodes 100 may be two, three, four, or five, etc. In the heating device, the first electrode posts 110 of the six graphite electrodes 100 can all be vertically arranged and spaced apart along the circumference, while the second electrode posts 120 of the six graphite electrodes 100 can be inclined in a direction away from the central axis of the circumference.
[0030] When the heating device is used to prepare a quartz crucible, the six graphite electrodes 100 can be energized, and the maximum distance between the first electrode posts 110 of the six graphite electrodes 100 can be less than a first predetermined distance. The first predetermined distance can be the maximum distance for arc initiation, meaning that the first electrode posts 110 of the six graphite electrodes 100 can be close to each other to initiate an arc within the maximum arc initiation distance range. The minimum distance between the second electrode posts 120 of the six graphite electrodes 100 can be greater than a second predetermined distance. The second predetermined distance can be the minimum distance for no arc initiation, meaning that the second electrode posts 120 of the six graphite electrodes 100 need to be far apart from each other to avoid initiating an arc outside the minimum arc initiation distance range.
[0031] like Figure 2As shown, in this embodiment, the heating device may further include six metal electrodes 200, the lower end of each metal electrode 200 being connected to the upper end of the second electrode post 120 of each graphite electrode 100. The metal electrodes 200 may be copper electrodes, which can energize the graphite electrodes 100 to facilitate arc initiation at the first electrode posts 110 of the six graphite electrodes 100. When the minimum distance between the second electrode posts 120 of the six graphite electrodes 100 is greater than a second predetermined distance, arcing between the six metal electrodes 200 can be prevented.
[0032] like Figure 3 As shown, in this embodiment, when preparing a quartz crucible, the layer structure 300 of the quartz crucible can be arranged inside the alloy steel mold 400 of the quartz crucible. Then, each layer structure 300 of the quartz crucible can be heated by a heating device to melt each layer structure 300, thereby preparing the desired quartz crucible. It is easy to see that since the first electrode posts 110 of the six graphite electrodes 100 of the heating device are all vertically arranged, when the first electrode posts 110 of the six graphite electrodes 100 are close to each other and the minimum distance is greater than the second predetermined distance, arcs can be formed at multiple axial positions of the first electrode posts 110 of the six graphite electrodes 100, forming a relatively large heating area. When the quartz crucible is heated by the heating device, the first electrode post 110 of the six graphite electrodes 100 can be inserted into the quartz crucible in its entirety to heat all parts of the quartz crucible at the same time, so that the quartz crucible is heated evenly, thereby making the prepared quartz crucible more uniform in thickness, smoother in surface, and more consistent in product, while improving the preparation efficiency of the quartz crucible.
[0033] It is understood that by setting the graphite electrodes 100 as first electrode posts 110 and second electrode posts 120 with obtuse angles on their axes, this application allows the heating device to heat the quartz crucible using its plurality of graphite electrodes 100. The first electrode posts 110 of the plurality of graphite electrodes 100 are all vertically arranged and spaced apart along the circumference, while the second electrode posts 120 of the plurality of graphite electrodes 100 are tilted away from the circumferential axis. This allows multiple axial positions of the first electrode posts 110 of the plurality of graphite electrodes 100 to form arcs, creating a relatively large heating area. Consequently, the first electrode posts 110 of the plurality of graphite electrodes 100 can extend entirely into the quartz crucible and simultaneously heat various parts of the quartz crucible, thus avoiding uneven heating of the quartz crucible.
[0034] Specifically, the angle between the axis of the first electrode post 110 and the axis of the second electrode post 120 is 120-170 degrees.
[0035] like Figure 4As shown in this embodiment, by way of example, when the axis of the first electrode post 110 and the axis of the second electrode post 120 are set at an obtuse angle, the included angle between the axis of the first electrode post 110 and the axis of the second electrode post 120 can preferably be 120-170 degrees, such as 120, 130, 140, 150, 160 or 170 degrees, etc., referring to... Figure 3 In this embodiment, the angle between the axis of the first electrode post 110 and the axis of the second electrode post 120 is 150 degrees.
[0036] It is understandable that in the heating device, when several graphite electrodes 100 approach each other to initiate an arc and extend into the quartz crucible to heat it, this embodiment, by reasonably setting the angle between the axis of the first electrode post 110 and the axis of the second electrode post 120, can both prevent the distance between the second electrode posts 120 from being too small, which would cause arcing between the metal electrodes 200, and prevent the distance between the second electrode posts 120 from being too large, which would cause the second electrode posts 120 to be too close to the upper end of the quartz crucible when the graphite electrodes 100 extend into the quartz crucible, thus affecting the extension of the first electrode post 110.
[0037] Specifically, the first electrode post 110 and the second electrode post 120 are threaded together.
[0038] like Figure 4 As shown in this embodiment, the connection between the first electrode post 110 and the second electrode post 120 can be a threaded connection. Specifically, the lower end of the second electrode post 120 can be provided with one of a mating threaded hole and a threaded post, while the upper end of the first electrode post 110 can be provided with the other of a mating threaded hole and a threaded post. When assembling the graphite electrode 100, screwing one of the first electrode post 110 and the second electrode post 120 into the other will connect the first electrode post 110 and the second electrode post 120.
[0039] Of course, in some embodiments, the upper end of the first electrode post 110 and the lower end of the second electrode post 120 may both be provided with threaded holes, and the graphite electrode 100 may also include a graphite threaded connector. The two ends of the graphite threaded connector are screwed into the threaded holes of the first electrode post 110 and the second electrode post 120 respectively, so that the first electrode post 110 and the second electrode post 120 can be connected.
[0040] like Figure 5As shown, in other embodiments, the first electrode post 110 and the second electrode post 120 can also be connected by a mortise and tenon joint. Specifically, the lower end of the second electrode post 120 may have one of a tenon and a mortise that cooperate with each other, while the upper end of the first electrode post 110 may have the other of a tenon and a mortise that cooperate with each other. When assembling the graphite electrode 100, applying pressure to slide the tenon into the mortise will connect the first electrode post 110 and the second electrode post 120.
[0041] It is understood that by threading the first electrode post 110 and the second electrode post 120 together, this embodiment not only simplifies and speeds up the assembly process of the first electrode post 110 and the second electrode post 120, thereby improving assembly efficiency, but also ensures a stable connection between the first electrode post 110 and the second electrode post 120.
[0042] Specifically, the upper end of the first electrode post 110 is provided with a first end face 111, and the first end face 111 is provided with a protruding first threaded post. The lower end of the second electrode post 120 is provided with a second end face 121, and the second end face 121 is provided with a recessed first threaded hole. The first threaded post is connected to the first threaded hole, and the first end face 111 coincides with the second end face 121.
[0043] like Figure 6 As shown in this embodiment, by way of example, the upper end face of the first electrode post 110 can be configured as a first end face 111, which can be inclined relative to the axis of the first electrode post 110. A first threaded post can be provided on the first end face 111, which can be integrally formed with the first electrode post 110 and protrude from the first end face 111. The lower end face of the second electrode post 120 can be configured as a second end face 121, which can be inclined relative to the axis of the second electrode post 120. A first threaded hole can be provided on the second end face 121, which can be recessed within the second end face 121. The first threaded post can be connected within the first threaded hole, so that the first electrode post 110 and the second electrode post 120 are threadedly connected.
[0044] In this embodiment, when the first electrode post 110 and the second electrode post 120 are threadedly connected, the first end face 111 can abut against the second end face 121. It is easy to see that the sum of the angle at which the first end face 111 is inclined relative to the axis of the first electrode post 110 and the angle at which the second end face 121 is inclined relative to the axis of the second electrode post 120 is the included angle between the axis of the first electrode post 110 and the axis of the second electrode post 120.
[0045] like Figure 6As shown, the first end face 111 and the second end face 121 can be made congruent, that is, the shape and size of the first end face 111 and the second end face 121 are the same, so that the first end face 111 and the second end face 121 coincide exactly when they come into contact. In this embodiment, the upper end of the first electrode post 110 and the lower end of the second electrode post 120 can both be cylindrical, and the outer diameters of the upper end of the first electrode post 110 and the lower end of the second electrode post 120 can be set to be equal. When the angle between the axis of the first electrode post 110 and the axis of the second electrode post 120 is 150 degrees, the inclination angle of the first end face 111 relative to the axis of the first electrode post 110 can be 75 degrees, and the inclination angle of the second end face 121 relative to the axis of the second electrode post 120 can also be 75 degrees. At this time, the first end face 111 and the second end face 121 are congruent ellipses.
[0046] It is understood that in this embodiment, by providing a first threaded post on the first end face 111 at the upper end of the first electrode post 110 and a first threaded hole on the second end face 121 at the lower end of the second electrode post 120, the first electrode post 110 and the second electrode post 120 can be threadedly connected through the first threaded post and the first threaded hole. Furthermore, by setting the first end face 111 and the second end face 121 to coincide, this embodiment can achieve a smoother transition when the first electrode post 110 and the second electrode post 120 are threadedly connected, so that protrusions or steps are less likely to occur at the connection between the first electrode post 110 and the second electrode post 120. This facilitates reasonable and accurate control of the distance between the first electrode post 110 and the second electrode post 120 of the graphite electrodes 100 when arc initiation is performed using several graphite electrodes 100.
[0047] The implementation principle of the graphite electrode 100 provided in Embodiment 1 of this application is as follows:
[0048] When fabricating the graphite electrode 100, a first threaded post is first formed on the first end face 111 of the first electrode post 110, and a first threaded hole is formed on the second end face 121 of the second electrode post 120. Then, the first electrode post 110 and the second electrode post 120 are threaded together through the first threaded post and the first threaded hole. During the threaded connection, the first end face 111 and the second end face 121 abut and overlap.
[0049] When preparing the quartz crucible, the second electrode post 120 of each graphite electrode 100 is connected to each metal electrode 200 to energize the graphite electrode 100 through the metal electrode 200. Then, the first electrode posts 110 of the six graphite electrodes 100 are all vertically arranged and spaced circumferentially, and the second electrode posts 120 of the six graphite electrodes 100 are tilted away from the circumferential axis. Subsequently, the six graphite electrodes 100 are brought close together such that the maximum distance between the first electrode posts 110 of the six graphite electrodes 100 is less than a first predetermined distance to initiate an arc, and the minimum distance between the second electrode posts 120 of the six graphite electrodes 100 is greater than a second predetermined distance to avoid arcing between the metal electrodes 200. The first electrode posts 110 of the six graphite electrodes 100 are then inserted into the alloy steel mold 400 of the quartz crucible to heat the various layers 300 of the quartz crucible disposed within the alloy steel mold 400.
[0050] This application configures the graphite electrodes 100 as first electrode posts 110 and second electrode posts 120 with obtuse angles along their axes. When the heating device heats the quartz crucible using its plurality of graphite electrodes 100, the first electrode posts 110 of the plurality of graphite electrodes 100 are all vertically arranged and spaced apart along the circumference, while the second electrode posts 120 of the plurality of graphite electrodes 100 are tilted away from the circumferential axis. This allows multiple axial positions of the first electrode posts 110 of the plurality of graphite electrodes 100 to form arcs, creating a relatively large heating area. Consequently, the first electrode posts 110 of the plurality of graphite electrodes 100 can extend entirely into the quartz crucible and simultaneously heat various parts of the quartz crucible, thus avoiding the problem of uneven heating of the quartz crucible.
[0051] Example 2
[0052] Embodiment 2 of this application provides a heating device for preparing a quartz crucible, such as... Figures 1 to 6 As shown, the heating device includes any of the graphite electrodes 100 provided in this application. The first electrode posts 110 of the plurality of graphite electrodes 100 are all vertically arranged and spaced apart along the circumference. The second electrode posts 120 of the plurality of graphite electrodes 100 are inclined in a direction away from the central axis of the circumference. The maximum distance between the first electrode posts 110 of the plurality of graphite electrodes 100 is less than a first predetermined distance, and the minimum distance between the second electrode posts 120 of the plurality of graphite electrodes 100 is greater than a second predetermined distance. The first predetermined distance is the maximum distance for arc initiation, and the second predetermined distance is the minimum distance for no arc initiation.
[0053] like Figure 2As shown in this embodiment, the heating device may include a plurality of graphite electrodes 100, and this embodiment uses six graphite electrodes 100 as an example. Of course, in some embodiments, the number of graphite electrodes 100 in the heating device may also be other, such as two, three, four or five. The first electrode posts 110 of the six graphite electrodes 100 may all be vertically arranged and spaced apart along the circumference, while the second electrode posts 120 of the six graphite electrodes 100 may be inclined in a direction away from the central axis of the circumference.
[0054] In this embodiment, when the heating device heats the quartz crucible, the six graphite electrodes 100 can be energized, and the maximum distance between the first electrode posts 110 of the six graphite electrodes 100 is less than a first predetermined distance. The first predetermined distance can be the maximum distance for arc initiation, meaning that the first electrode posts 110 of the six graphite electrodes 100 can be close to each other to initiate an arc within the maximum arc initiation distance range. The minimum distance between the second electrode posts 120 of the six graphite electrodes 100 can be greater than a second predetermined distance, meaning that the second electrode posts 120 of the six graphite electrodes 100 need to be far apart from each other to avoid initiating an arc outside the minimum arc initiation distance range.
[0055] like Figure 3 As shown, when preparing a quartz crucible, the layer structure 300 of the quartz crucible can be arranged in the alloy steel mold 400 of the quartz crucible first. Then, the layer structure 300 of the quartz crucible can be heated by a heating device to melt the layer structure 300, thereby preparing the required quartz crucible.
[0056] When the graphite electrodes 100 of the heating device are energized, since the first electrode posts 110 of the six graphite electrodes 100 are all vertically arranged, when the first electrode posts 110 of the six graphite electrodes 100 approach each other, arcs can be formed at multiple axial positions of the first electrode posts 110 of the six graphite electrodes 100, thus forming a relatively large heating area. When heating the quartz crucible through the heating device, the first electrode posts 110 of the six graphite electrodes 100 can be inserted entirely into the quartz crucible to heat all parts of the quartz crucible simultaneously, so that the quartz crucible is heated evenly. This results in a more uniform thickness, a smoother surface, and better product consistency in the prepared quartz crucible, while also improving the preparation efficiency of the quartz crucible.
[0057] It is understood that by vertically arranging the first electrode posts 110 of several graphite electrodes 100 and spacing them around the circumference, and tilting the second electrode posts 120 of several graphite electrodes 100 away from the central axis of the circumference, the first electrode posts 110 of several graphite electrodes 100 can be arced at multiple axial positions to form a relatively large heating area. This allows the first electrode posts 110 of several graphite electrodes 100 to extend entirely into the quartz crucible and simultaneously heat various parts of the quartz crucible, thus avoiding the problem of uneven heating of the quartz crucible.
[0058] Specifically, the heating device also includes a plurality of metal electrodes 200, the lower end of each metal electrode 200 being connected to the upper end of the second electrode post 120 of each graphite electrode 100.
[0059] like Figure 2 and Figure 3 As shown in this embodiment, it is illustrated by way of example that the graphite electrode 100 can be energized by the metal electrode 200 so that the first electrode posts 110 of the six graphite electrodes 100 can generate an arc when they are close to each other. The metal electrode 200 can correspond one-to-one with the graphite electrode 100, and the metal electrode 200 can be a copper electrode, the lower end of which can be directly connected to the upper end of the second electrode post 120 of the graphite electrode 100.
[0060] Of course, in some embodiments, the metal electrode 200 and its corresponding graphite electrode 100's second electrode post 120 can also be indirectly connected. For example, the metal electrode 200 can be indirectly connected to its corresponding graphite electrode 100's second electrode post 120 through a graphite tube connector, and the connection method between the graphite tube connector and both the metal electrode 200 and the graphite electrode 100's second electrode post 120 can be a threaded connection. In this embodiment, it can not only further prevent arcing between the metal electrodes 200, but also reduce the wear and tear of the metal electrode 200.
[0061] It is understood that in this embodiment, by connecting the upper end of the second electrode post 120 of the graphite electrode 100 to the lower end of the metal electrode 200, it is convenient to energize the graphite electrode 100, so as to further facilitate the arcing of the first electrode posts 110 of several graphite electrodes 100 when they are close to each other.
[0062] More specifically, the lower end of the metal electrode 200 is threadedly connected to the upper end of the second electrode post 120 of its corresponding graphite electrode 100.
[0063] like Figure 3 and Figure 4As shown in this embodiment, it is exemplarily illustrated that when the upper end of the second electrode post 120 of the graphite electrode 100 is connected to the lower end of the metal electrode 200, the connection method can also be a threaded connection. The upper end of the second electrode post 120 of the graphite electrode 100 may be provided with a second threaded post, while the lower end of the metal electrode 200 may be provided with a second threaded hole corresponding to the second threaded hole. Connecting the second threaded post to the second threaded hole allows the upper end of the second electrode post 120 to be threadedly connected to the lower end of the metal electrode 200.
[0064] It is understood that by threading the second electrode post 120 to the metal electrode 200 in this embodiment, the assembly process of the second electrode post 120 and the metal electrode 200 can be made simple, convenient and quick, thereby improving assembly efficiency; and the connection between the second electrode post 120 and the metal electrode 200 can also be made stable.
[0065] Specifically, the outer diameter of the first electrode post 110 is the same at all points along its axial direction.
[0066] like Figure 2 and Figure 4 As shown in this embodiment, by way of example, the outer diameter of the first electrode post 110 at all points along its axial direction can be set to be equal. When the six graphite electrodes 100 approach each other, the distance between the first electrode posts 110 of the six graphite electrodes 100 can be set to be the same and can all be less than a first predetermined distance, so that the entire first electrode post 110 of the graphite electrode 100 can be used for arc initiation, thereby making the arc initiation effect of the plurality of graphite electrodes 100 more stable.
[0067] In some embodiments, the lower end of the first electrode post 110 of the graphite electrode 100 may also be configured as an inverted cone, hemisphere, or other shape.
[0068] It is understood that by setting the outer diameter of the first electrode post 110 at all points along the axial direction to be equal, this embodiment can ensure that the first electrode posts 110 of the graphite electrodes 100 are spaced at the same distance along the axial direction when they are close to each other, thereby ensuring the arc-starting effect of the first electrode posts 110 of the graphite electrodes 100.
[0069] More specifically, the outer diameter of the second electrode post 120 is the same at all points along its axis.
[0070] like Figure 2 and Figure 4As shown in this embodiment, by way of example, the outer diameter of the second electrode post 120 at all points along its axial direction can also be set to be equal. When the second electrode posts 120 of several graphite electrodes 100 are close to each other, as long as the minimum distance between the lower ends of the second electrode posts 120 of several graphite electrodes 100 is greater than the second predetermined distance, the minimum distance between the middle and upper ends of the second electrode posts 120 can be greater than the second predetermined distance.
[0071] It is understood that in this embodiment, by making the outer diameter of the second electrode post 120 equal at all points along the axial direction, the minimum distance between the second electrode posts 120 of the plurality of graphite electrodes 100 at all points along the axial direction is greater than the second predetermined distance, so that arcing is less likely to occur between the metal electrodes 200 connected to the second electrode post 120.
[0072] Specifically, the length of the first electrode post 110 is greater than 70% of the depth of the quartz crucible.
[0073] like Figure 3 As shown in this embodiment, by way of example, the length of the first electrode post 110 can preferably be greater than 70% of the depth of the quartz crucible, for example, the depth of the quartz crucible is 780 mm. Figure 3 In the figure H, the length of the first electrode post 110 of the graphite electrode 100 is greater than 780*0.7mm, referring to... Figure 3 L in the figure. At this length, the first electrode post 110 of the six graphite electrodes 100 can maintain a suitable distance from the quartz crucible when the entire length extends into the quartz crucible, so as to improve the effect of the first electrode post 110 of the six graphite electrodes 100 on the uniform heating of the quartz crucible.
[0074] It is understandable that by reasonably setting the length of the first electrode post 110, this embodiment can make the first electrode post 110 of several graphite electrodes 100 heat the quartz crucible more evenly when the entire length of the first electrode post 110 extends into the quartz crucible.
[0075] The implementation principle of the heating device provided in Embodiment 2 of this application is as follows:
[0076] In fabricating the heating device, the upper end of the first electrode post 110 is first connected to the lower end of the second electrode post 120 to form a graphite electrode 100. Then, the upper end of the second electrode post 120 is threadedly connected to the lower end of the metal electrode 200 via a second threaded post and a second threaded hole. Next, the first electrode posts 110 of the six graphite electrodes 100 are all vertically arranged and spaced apart circumferentially, and the second electrode posts 120 of the six graphite electrodes 100 are tilted away from the circumferential axis. The first electrode posts 110 of the six graphite electrodes 100 are then brought closer together, such that the maximum distance between the first electrode posts 110 of the six graphite electrodes 100 is less than a first predetermined distance, thereby causing arcing between the first electrode posts 110 of the six graphite electrodes 100. Simultaneously, the minimum distance between the second electrode posts 120 of the six graphite electrodes 100 is greater than a second predetermined distance to prevent arcing between the metal electrodes 200.
[0077] When preparing the quartz crucible, the first electrode post 110 of the six graphite electrodes 100 is inserted into the alloy steel mold 400 of the quartz crucible to heat the various layer structures 300 of the quartz crucible disposed in the alloy steel mold 400.
[0078] This application, by vertically arranging the first electrode posts 110 of several graphite electrodes 100 and spacing them around the circumference, and tilting the second electrode posts 120 of several graphite electrodes 100 away from the central axis of the circumference, allows multiple axial positions of the first electrode posts 110 of several graphite electrodes 100 to form an arc, thereby creating a relatively large heating area. This allows the first electrode posts 110 of several graphite electrodes 100 to extend entirely into the quartz crucible and simultaneously heat various parts of the quartz crucible, thus avoiding the problem of uneven heating of the quartz crucible.
[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0080] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A graphite electrode, characterized in that, The graphite electrode (100) includes a first electrode post (110) and a second electrode post (120). The upper end of the first electrode post (110) is connected to the lower end of the second electrode post (120). The axis of the first electrode post (110) and the axis of the second electrode post (120) are set at an obtuse angle.
2. The graphite electrode according to claim 1, characterized in that, The angle between the axis of the first electrode post (110) and the axis of the second electrode post (120) is 120-170 degrees.
3. The graphite electrode (100) according to claim 1, characterized in that, The first electrode post (110) is threadedly connected to the second electrode post (120).
4. The graphite electrode according to claim 1, characterized in that, The upper end of the first electrode post (110) is provided with a first end face (111), and the first end face (111) is provided with a protruding first threaded post. The lower end of the second electrode post (120) is provided with a second end face (121), and the second end face (121) is provided with a recessed first threaded hole. The first threaded post is connected to the first threaded hole, and the first end face (111) coincides with the second end face (121).
5. A heating device for preparing a quartz crucible, characterized in that, The heating device includes a plurality of graphite electrodes (100) as described in any one of claims 1-4. The first electrode posts (110) of the plurality of graphite electrodes (100) are all vertically arranged and spaced apart along the circumference. The second electrode posts (120) of the plurality of graphite electrodes (100) are inclined in a direction away from the central axis of the circumference. The maximum distance between the first electrode posts (110) of the plurality of graphite electrodes (100) is less than a first predetermined distance. The minimum distance between the second electrode posts (120) of the plurality of graphite electrodes (100) is greater than a second predetermined distance. The first predetermined distance is the maximum distance for arc initiation, and the second predetermined distance is the minimum distance for no arc initiation.
6. The heating device according to claim 5, characterized in that, The heating device also includes a plurality of metal electrodes (200), the lower end of each metal electrode (200) being connected to the upper end of the second electrode post (120) of each graphite electrode (100).
7. The heating device according to claim 6, characterized in that, The lower end of the metal electrode (200) is threadedly connected to the upper end of the second electrode post (120) of the corresponding graphite electrode (100).
8. The heating device according to claim 5, characterized in that, The outer diameter of the first electrode post (110) is the same at all points along its axial direction.
9. The heating device according to claim 5, characterized in that, The outer diameter of the second electrode post (120) is the same at all points along its axial direction.
10. The heating device according to claim 5, characterized in that, The length of the first electrode post (110) is greater than 70% of the depth of the quartz crucible.