Graphite heating body splicing structure and graphite heating body thereof

Abstract

The utility model relates to a graphite heating body splicing structure and a graphite heating body thereof. The graphite heating body splicing structure comprises a heating main body, an inserting strip and an inserting groove, wherein the inserting strip and the inserting groove are arranged at two ends of the heating main body and connected with the adjacent heating main body. And the graphite heating body with a cylindrical structure is formed by mutually splicing the plurality of heating main bodies. Moreover, during splicing, the convex structures on the outer side walls of the inserting strips are matched with the grooves in the inserting grooves during splicing, so that the contact area of the adjacent heating main bodies during splicing is increased, and the convex structures and the grooves can continue to be in contact even if an adhesive layer at the splicing position is oxidized in an aerobic environment of the graphite heating body, so that the graphite heating body is prevented from being damaged, and the service life of the graphite heating body is prolonged. Therefore, the connection stability between the adjacent heating main bodies is ensured, and the dangerous phenomena that induction eddy current cannot be formed and ignition discharge occurs are avoided. In addition, through mutual matching and inserting connection of the protruding structures, the cross section of the splicing position is increased, and therefore the splicing position is not prone to cracking.

Description

Technical Field

[0001] The utility model relates to the technical field of graphite heating elements, in particular to a graphite heating element splicing structure and a graphite heating element thereof. Background Art

[0002] Graphite heating element refers to the heating element component of electric furnace made of graphite material. Graphite has excellent electrical and thermal conductivity. Graphite is often used as a heating element in special industrial furnaces. In the early days of industrial electric furnaces, graphite electrodes were selected as heating elements, and later high-density high-power electrodes were selected as heating elements. With the development of the semiconductor industry, heating furnaces for refining single crystal silicon, single crystal germanium, gallium arsenide, indium phosphide and other materials select high-purity fine-structure graphite and isotropic graphite as heating elements. Some special industrial roads and test furnaces use carbon cloth or graphite cloth as heating elements.

[0003] At present, with the large-scale heating furnace body, the graphite heating element in the heating furnace body needs to be large-scale to match the large-scale heating furnace body. However, the processing conditions for graphite heating elements are currently limited. When the diameter of the graphite heating element is ≥2000mm, the yield of its graphite blank is extremely low, which leads to high manufacturing costs. Therefore, a graphite heating element rotary structure that uses multiple graphite heating element monomers to form an integral structure by splicing them in a circular ring along the circumference has emerged. For example: Chinese patent publication number CN215420833U discloses a large-diameter graphite heating element for a vacuum induction furnace, specifically: including a heating element body surrounded by multiple heating element petals, each heating element petal is respectively provided with slots and inserts that cooperate with each other and penetrate up and down at both ends, and two adjacent heating element petals are plugged into each other through the slots and inserts, and the plug-in parts of the two adjacent heating element petals are fixed by fasteners so that the diameter of the spliced ​​product reaches more than 2000mm.

[0004] At present, the graphite heating element that is spliced ​​is fastened with high-temperature graphite glue, that is, in the splicing process, it is necessary to apply high-temperature graphite glue on the outer wall of the insert or / and the inner wall of the slot. However, there is a situation: once the product heated by the graphite heating element has oxides, the product contains oxygen components inside. Then, under the conditions of oxygen and high temperature, oxygen is very easy to react with the carbon in the high-temperature graphite glue to produce carbon monoxide or carbon dioxide, which then causes the glue layer used to connect the adjacent heating petals to be oxidized, resulting in gaps at the connection of adjacent heating petals, which leads to the inability to form induced eddy currents between adjacent heating petals and the dangerous phenomenon of spark discharge. Another situation is: the problem that exists in the vacuum condition containing oxygen or not containing oxygen is that when the splicing of the graphite heating element is high temperature, due to the thermal expansion and contraction, the splicing will also expand due to heat. Once the expansion coefficients of the adjacent heating petals are different, the deformation of the adjacent heating petals will be inconsistent, which will lead to the cracking of the splicing. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a graphite heating element splicing structure and a graphite heating element thereof, which solves the problem of oxidation of the glue layer between adjacent heating petals, which makes it very easy for gaps to appear at the connection between adjacent heating petals, thereby resulting in the inability to form induced eddy currents between adjacent heating petals and the dangerous phenomenon of spark discharge, as well as the problem of inconsistent deformation of adjacent heating petals, which in turn leads to the technical problem of cracking at the splicing.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0009] On the one hand, the embodiment of the utility model provides a graphite heating element splicing structure, including a heating body, wherein the heating body is a plate-shaped arc-shaped structural member bent inward, and the heating body has a plug-in strip and a plug-in groove which are arranged at both ends thereof and connected to the adjacent heating body;

[0010] The plug-in strip is plugged in with the plug-in slot of the adjacent heating body on one side, and the plug-in slot is plugged in with the plug-in strip of the adjacent heating body on the other side, and a plurality of heating elements can be spliced ​​with each other through the plug-in strips and the plug-in slots thereon to form a graphite heating element with a cylindrical structure;

[0011] A convex structure is arranged on one side wall of the plug-in strip, and a groove matching the convex structure is formed outwardly of the plug-in slot at a position corresponding to the convex structure.

[0012] The utility model provides a graphite heating element splicing structure and a graphite heating element thereof, comprising a heating body and a plug-in strip and a plug-in slot disposed at both ends of the heating body and connected to adjacent heating bodies. A graphite heating element with a cylindrical structure is formed by mutual plugging and assembly between a plurality of heating bodies. Moreover, during splicing, the raised structure on the outer wall of the plug-in strip and the groove in the plug-in slot cooperate with each other during splicing to increase the contact area between adjacent heating bodies during splicing, thereby ensuring that the graphite heating body is in an aerobic environment, even if the glue layer at the splicing site is oxidized, the raised structure and the groove can continue to contact to ensure the connection stability between adjacent heating bodies, thereby avoiding the failure to form induced eddy currents and the dangerous phenomenon of sparking and discharge. Moreover, while increasing the contact area between adjacent heating bodies, it is also possible to avoid the phenomenon of impedance and power consumption caused by a small contact area, thus saving a lot of costs.

[0013] Optionally, the plug-in strip is an arc-shaped strip arranged outwardly along the circumference of the cylindrical structure, and the arc-shaped strip passes through the end surface of the arc-shaped structural member in the vertical direction.

[0014] Optionally, a positioning step for axially positioning the plug-in strip is provided at the top of the groove.

[0015] Optionally, the protrusion structure includes a bump, and the bump is a rectangular parallelepiped structure, and the bump is arranged on the outer side wall of the arc strip.

[0016] Optionally, the protruding structure includes at least one convex block, and the convex block is a rectangular parallelepiped structure, and the convex block is arranged on the outer side wall of the arc strip.

[0017] Optionally, a plurality of the protrusions are arranged at intervals along the vertical direction of the outer side wall of the arc-shaped strip.

[0018] Optionally, the plug-in strip is arranged on the end surface of the heat-generating body away from the outer side of the cylindrical structure.

[0019] On the other hand, a graphite heating element comprises the graphite heating element splicing structure, wherein there are multiple graphite heating element splicing structures, and adjacent graphite heating element splicing structures are spliced ​​and bonded to each other by coating a glue layer on the plug-in strip and the outer side wall of the plug-in groove to form the cylindrical structural member.

[0020] Optionally, a tightening member is also included;

[0021] A first tightening half groove is opened through the end wall of the plug-in strip of the heating body, and a second tightening half groove is opened on the inner wall of the plug-in groove of the heating body. The first tightening half groove and the second tightening half groove can form a closed tightening groove for accommodating the tightening member when adjacent heating bodies are spliced, and the closed tightening groove abuts against the outer wall of the tightening member.

[0022] Optionally, the adhesive layer is graphite adhesive.

[0023] Optionally, a bolt fastener is further included, and the bolt fastener can pass through the plug-in strip along the radial direction of the cylindrical structure.

[0024] (III) Beneficial effects

[0025] The beneficial effects of the utility model are as follows: a graphite heating element splicing structure of the utility model comprises a heating body and a plug-in strip and a plug-in slot arranged at both ends of the heating body and connected to adjacent heating bodies. A graphite heating element of a cylindrical structure is formed by plugging and assembling a plurality of heating bodies. Moreover, during splicing, the convex structure on one side wall of the plug-in strip and the groove in the plug-in slot cooperate with each other during splicing to increase the contact area of ​​adjacent heating bodies during splicing, thereby ensuring that the graphite heating element is in an aerobic environment, even if the glue layer at the splicing is oxidized, the convex structure and the groove can continue to contact to ensure the connection stability between adjacent heating bodies. Moreover, the convex structure provided in the utility model can make the splicing of adjacent heating bodies closely cooperate, thereby effectively preventing oxygen from entering the splicing, thereby playing a good protective role for the glue layer at the splicing. At the same time, it avoids the dangerous phenomenon of being unable to form induced eddy currents and the occurrence of spark discharge. In addition, while increasing the contact area between adjacent heating bodies, it can also avoid the phenomenon of impedance and power consumption caused by small contact area, saving a lot of cost.

[0026] A graphite heating element, by providing adjacent heating bodies with protruding structures for mutual plugging, increases the cross-sectional connection of the joint, thereby making the joint less prone to cracking and improving the stability of the connection. In addition, by additionally adding a tightening member to cooperate with the tightening groove to tighten, it can ensure that when the joint contains oxygen after the heating body is spliced, the joint can also be tightly connected when oxidized. In addition, it can also effectively oxygenate the joints where the protruding structure and the groove cooperate. Thus, the service life of the heating body is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of the graphite heating element of the utility model;

[0028] Figure 2 This is an enlarged view of the details at location 1.

[0029] Figure 3 for Figure 1 Schematic diagram of the decomposed structure of two adjacent spliced ​​structures of the graphite heating element;

[0030] Figure 4 for Figure 1 Reverse view of ;

[0031] Figure 5 This is a schematic diagram of the reverse structure of the last heating body when adjacent heating bodies are spliced ​​together.

[0032] [Description of Reference Numerals]

[0033] 1: heating body; 11: plug-in strip; 12: plug-in slot; 121: positioning step; 13: raised structure; 14: groove; 15: tightening slot; 16: through slot;

[0034] 2: tightening parts;

[0035] 100: Graphite heating element. DETAILED DESCRIPTION

[0036] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific implementation methods. Figure 1 The orientation of Figure 1 The outer ring side wall of the middle cylindrical structure is defined as "outer"; Figure 1 The top end surface of the middle cylindrical structure is defined as "upper", and the bottom end surface is defined as "lower".

[0037] The utility model embodiment proposes a graphite heating element splicing structure and a graphite heating element in an oxygen-containing environment, including a heating body 1 and a plug-in strip 11 and a plug-in slot 12 arranged at both ends of the heating body 1 and connected to the adjacent heating body 1. The graphite heating element of a cylindrical structure is formed by mutual plugging and assembling between multiple heating bodies 1. Moreover, during splicing, the convex structure 13 on the side wall of the plug-in strip 11 and the groove 14 in the plug-in slot 12 cooperate with each other during splicing to increase the contact area of ​​adjacent heating bodies 1 during splicing, thereby ensuring that the graphite heating element is in an oxygen environment. Even if the glue layer at the splicing is oxidized, the convex structure 13 and the groove 14 can continue to contact to ensure the connection stability between adjacent heating bodies 1. Moreover, the convex structure 13 provided in the utility model can make the splicing of adjacent heating bodies 1 closely cooperate, thereby effectively preventing oxygen from entering the splicing, thereby playing a good protective role on the glue layer at the splicing. At the same time, it avoids the dangerous phenomenon of failure to form induced eddy currents and spark discharge. In addition, while increasing the contact area between adjacent heating elements, it can also avoid the phenomenon of impedance and power consumption caused by a small contact area, saving a lot of costs.

[0038] On the other hand, the utility model increases the cross-sectional connection of the joints by means of the mutual cooperation and insertion of the raised structures 13 in an anaerobic environment, thereby making the joints less prone to cracking, improving the stability of the connection, and also bringing certain technical effects.

[0039] A graphite heating element increases the cross-sectional area of ​​the joint by providing protruding structures 13 on adjacent heating bodies 1, thereby making the joint less prone to cracking and improving the stability of the joint.

[0040] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0041] Example:

[0042] Reference Figure 1 As shown, a graphite heating element includes a graphite heating element splicing structure. There are multiple graphite heating element 100 splicing structures, and adjacent graphite heating element 100 splicing structures are spliced ​​and bonded to each other by coating a glue layer on the outer side walls of the plug-in strip 11 and the plug-in groove 12 to form a cylindrical structure.

[0043] Further, see Figure 2-4 As shown, a tightening member 2 is also included. A first tightening half groove is provided along the end wall of the plug-in strip 11 of the heating body 1, and a second tightening half groove is provided along the inner wall of the plug-in groove 12 of the heating body 1. The first tightening half groove and the second tightening half groove can form a closed tightening groove 15 for accommodating the tightening member 2 when adjacent heating bodies 1 are spliced, and the closed tightening groove 15 abuts against the outer wall of the tightening member 2. The tightening member 2 is additionally provided to cooperate with the tightening groove 15 to tighten, so that when the heating body 1 is in an oxygen-containing state after splicing, the splicing part can be tightly connected when oxidized. In addition, the oxygen protrusion structure 13 and the groove 14 can be effectively oxygenated. Thereby, the service life of the heating body 1 is improved.

[0044] Here, the close fit is seamless compared to the splicing. After the heating body 1 on the side of the groove 14 close to the center of the cylindrical structure is oxidized in an aerobic environment, the tensioning member 2 at the splicing position abuts against the adjacent heating body 1, thereby increasing the contact area to ensure positioning and prevent the adjacent heating body 1 from falling off at the splicing position when used in an aerobic environment, and becoming unusable. In addition, the tensioning member 2 is set along the axial end face of the cylindrical structure to ensure that oxygen cannot enter the splicing gap between the raised structure 13 and the groove 14, thereby reducing the risk of oxidation of the splicing position and greatly improving the service life. Reduce costs.

[0045] Furthermore, the two tightening pins of the tightening member can also be a rectangular parallelepiped pin structure, which will not be described in detail again.

[0046] It should be noted that the graphite heating element can be any one of a graphite muffle box, a graphite crucible or a graphite insulation cylinder, again without making too many restrictions.

[0047] Furthermore, the adhesive layer is graphite adhesive. It should be noted that the graphite adhesive is high temperature graphite adhesive. It is an existing adhesive in the field of graphite heating elements, and will not be described in detail here.

[0048] Furthermore, a bolt fastener (not shown) is included, which can pass through the plug-in strip 11 along the radial direction of the cylindrical structure. It should be noted that by setting the bolt fastener for dual positioning in the axial and circumferential directions, the stability of the overall graphite heating element 100 during use is further ensured.

[0049] In this embodiment, see Figure 2-Figure 3 As shown, a graphite heating element splicing structure includes a heating body 1, and the heating body 1 is a plate-shaped arc-shaped structural member that bends inward. The heating body 1 has a plug-in strip 11 and a plug-in groove 12 that are arranged at both ends and connected to the adjacent heating bodies 1. The plug-in strip 11 is plugged in with the plug-in groove 12 of the heating body 1 adjacent to one side, and the plug-in groove 12 is plugged in with the plug-in strip 11 of the heating body 1 adjacent to the other side. Multiple heating bodies 1 can be spliced ​​with each other through the plug-in strips 11 and the plug-in grooves 12 thereon to form a graphite heating body 100 with a cylindrical structure. A protruding structure 13 is provided on one side wall of the plug-in strip 11, and the plug-in groove 12 is provided with a groove 14 that matches the protruding structure 13 outward at a position corresponding to the protruding structure 13. It should be noted that the protruding structure 13 can be provided on the inner side wall of the plug-in strip 11, and of course, it can also be provided on the outer side wall of the plug-in strip 11.

[0050] Furthermore, the plug-in strip 11 is an arc strip arranged outward along the circumference of the cylindrical structure, and the arc strip passes through the end face of the arc structure in the vertical direction (from top to bottom). The arc strip is arranged to match the shape of the heating body 1, which is conducive to a better plug-in effect of adjacent heating bodies 1. It should also be noted that the arc strip passes through the end face of one side wall of the heating body 1 (arc structure) for easy installation and simple molding process.

[0051] Furthermore, the protrusion structure 13 includes a convex block, and the convex block is a rectangular parallelepiped structure, and the convex block is arranged on the outer side wall of the arc strip. The convex block is a rectangular parallelepiped structure for easy molding and plugging, and the convex block and the arc strip are integrally molded. Of course, the convex block can be a hemispherical body or a partial convex point.

[0052] Furthermore, the ratio of the length of the protrusion in the vertical direction to the length of the arc strip in the vertical direction is 1:3, so as to maximize the contact area of ​​the splicing while ensuring the convenience of installation.

[0053] Here, it should be noted that when adjacent heating bodies 1 are spliced, the gap between the plug strip 11 and the plug slot 12 is 0-1 mm. Compared with the previous prior art, the gap setting parameter is larger, which is more convenient for splicing and installation, more uniform glue coating, and simplifies the glue coating process.

[0054] Furthermore, a positioning step 121 for axially positioning the plug-in strip 11 is provided at the top of the groove 14. The positioning step 121 can effectively position the plug-in strip 11 in the axial direction (vertical direction), achieving a good splicing effect.

[0055] Furthermore, in terms of the circumferential length, the ratio of the arc strip to the heating body 1 is 1:6. The length of the arc strip plug-in strip 11 is moderate.

[0056] Furthermore, the plug-in strip 11 is arranged on the end surface of the heating body 1 away from the outer side of the cylindrical structure, so as to ensure the stability of the connection of the plug-in strip 11 and the structural stability of the overall graphite heating element 100.

[0057] In this embodiment, see Figure 5 As shown, after the adjacent heating bodies 1 are spliced, the last heating body 1 has no protruding structure 13 and the groove 14 to match, in order to form a complete cylindrical structure. The last heating body 1 falls freely from top to bottom. Figure 5 The right side plug-in slot 12 is a through slot 16 without a groove 14 .

[0058] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0061] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0062] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A graphite heating element splicing structure, characterized in that: The heating body (1) comprises a heating body (1), wherein the heating body (1) is a plate-shaped arc-shaped structural member that is bent inwards, and the heating body (1) has a plug-in strip (11) and a plug-in slot (12) that are arranged at two ends thereof opposite to each other and connected to adjacent heating bodies (1); The plug-in strip (11) is plugged in with the plug-in slot (12) of the adjacent heating body (1) on one side, and the plug-in slot (12) is plugged in with the plug-in strip (11) of the adjacent heating body (1) on the other side, so that a plurality of heating bodies (1) can be spliced ​​together through the plug-in strips (11) and the plug-in slots (12) thereon to form a graphite heating body (100) with a cylindrical structure; A protruding structure (13) is provided on one side wall of the plug-in strip (11), and a groove (14) matching the protruding structure (13) is formed outwardly on the plug-in slot (12) at a position corresponding to the protruding structure (13).

2. The graphite heating element splicing structure according to claim 1, characterized in that: The plug-in strip (11) is an arc-shaped strip arranged outwardly along the circumference of the cylindrical structure, and the arc-shaped strip penetrates the end surface of the arc-shaped structural member in the vertical direction.

3. The graphite heating element splicing structure according to claim 2, characterized in that: A positioning step (121) for axially positioning the plug-in strip (11) is provided at the top of the groove (14).

4. The graphite heating element splicing structure according to claim 2, characterized in that: The protruding structure (13) comprises at least one protrusion, and the protrusion is a rectangular parallelepiped structure, and the protrusion is arranged on the outer side wall of the arc strip.

5. The graphite heating element splicing structure according to claim 4, characterized in that: The plurality of protrusions are arranged at intervals along the vertical direction of the outer side wall of the arc strip.

6. The graphite heating element splicing structure according to claim 1, characterized in that: The plug-in strip (11) is arranged on the end surface of the heating body (1) and outside the cylindrical structure.

7. A graphite heating element, characterized in that: It comprises the graphite heating element splicing structure as described in any one of claims 1 to 6, wherein there are multiple graphite heating element (100) splicing structures, and adjacent graphite heating element (100) splicing structures are spliced ​​and bonded to each other by coating an adhesive layer to form the cylindrical structure.

8. The graphite heating element according to claim 7, characterized in that: It also includes a tightening member (2); A first tightening half groove is provided along the end wall of the plug-in strip (11) of the heating body (1), and a second tightening half groove is provided along the inner wall of the plug-in groove (12) of the heating body (1). When adjacent heating bodies (1) are spliced, the first tightening half groove and the second tightening half groove can form a closed tightening groove (15) for accommodating the tightening member (2), and the closed tightening groove (15) abuts against the outer wall of the tightening member (2).

9. The graphite heating element according to claim 8, characterized in that: The adhesive layer is graphite adhesive.

10. The graphite heating element according to claim 7, characterized in that: It also comprises a bolt fastener, which can pass through the plug-in strip (11) in the radial direction of the cylindrical structure.

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