Carbon-carbon composite spliced heat preservation cylinder and production process thereof

Abstract

The application discloses a carbon-carbon composite spliced heat preservation cylinder and a production process thereof, which comprises a heat preservation unit and a fixing unit, the heat preservation unit comprises a heat preservation plate group, the heat preservation plate group comprises first heat preservation plates, second heat preservation plates, third heat preservation plates and fourth heat preservation plates, the heat preservation plates in the heat preservation plate group are all in circular arc structures, the heat preservation unit further comprises a connecting assembly, and the heat preservation plates in the heat preservation plate group are spliced to form the side wall of the heat preservation cylinder through the connecting assembly; the first heat preservation plates, the second heat preservation plates, the third heat preservation plates and the fourth heat preservation plates with different structures are arranged and connected through the connecting assembly to be spliced to form the cylindrical side wall of the heat preservation cylinder in sequence, the connecting strength between the heat preservation plates in the heat preservation plate group is strengthened, meanwhile, the connecting assembly has the effect of shielding the splicing gaps between the heat preservation plates in the heat preservation plate group, the heat preservation effect of the whole heat preservation cylinder is enhanced, and the loss of heat emission from the gaps is reduced.

Description

Technical Field

[0001] This invention relates to the field of carbon-carbon composite insulation cylinder technology, specifically to a carbon-carbon composite spliced ​​insulation cylinder and its manufacturing process. Background Technology

[0002] Insulation cylinders are an indispensable component in the crystal pulling hot zone, and currently, the insulation cylinders mainly used in crystal pulling hot zones are made of graphite. The insulation cylinders primarily function to construct the hot zone space and provide thermal insulation.

[0003] As monocrystalline silicon manufacturers increase their material loading, the required size of insulation cylinders will also increase accordingly. Due to the larger size of the insulation cylinders, they are prone to deformation, resulting in a lower yield rate and longer delivery cycles. Traditional integral insulation cylinders are being phased out due to limitations in manufacturing costs and raw material dimensions. Meanwhile, more advanced spliced ​​insulation cylinders using carbon-based carbon fiber are gradually gaining widespread application. However, spliced ​​insulation cylinders are composed of multiple plates, and large gaps will be generated between adjacent plates and between plates and retaining rings. This is detrimental to the insulation performance of carbon-carbon insulation cylinders and affects the insulation effect of the thermal field space. Summary of the Invention

[0004] To address the shortcomings of existing technologies, a carbon-carbon composite spliced ​​insulation cylinder and its manufacturing process are proposed. This solves the problem in the aforementioned background technology where spliced ​​insulation cylinders are composed of multiple panels, resulting in large splicing gaps between adjacent panels and between panels and retaining rings, which is detrimental to the insulation performance of carbon-carbon insulation cylinders.

[0005] To achieve the above objectives, the present invention proposes the following technologies:

[0006] A carbon-carbon composite spliced ​​insulation cylinder includes an insulation unit and a fixing unit. The insulation unit includes an insulation board assembly, which includes a first insulation board, a second insulation board, a third insulation board, and a fourth insulation board. All insulation boards in the insulation board assembly have an arc-shaped structure. The insulation unit also includes a connecting component. The insulation boards in the insulation board assembly are spliced ​​together by the connecting component to form the sidewall of the insulation cylinder. The fixing unit includes a first fixing ring and a second fixing ring. The first fixing ring and the second fixing ring are respectively disposed at both ends of the insulation board assembly to limit and fix the insulation boards in the insulation board assembly.

[0007] Furthermore, the connecting component is an arc-shaped insert, the curvature of which is the same as that of the insulation board in the insulation board assembly. The left and right sides of the insulation board in the insulation board assembly are respectively provided with slots for inserting the insert, the slots are arc-shaped, and the curvature of the slots is the same as that of the insert.

[0008] Furthermore, the connecting component includes a first connecting component, and a plurality of fourth insulation boards are provided. The first connecting component is provided between two adjacent fourth insulation boards to cover the gaps between the fourth insulation boards.

[0009] Furthermore, the first connecting component is provided between the first insulation board and the adjacent fourth insulation board, and the first connecting component is provided between the second insulation board and the adjacent fourth insulation board, so as to cover the gap between the first insulation board and the adjacent fourth insulation board, and the gap between the second insulation board and the adjacent fourth insulation board.

[0010] Furthermore, the connecting component includes a second connecting component, which is disposed between the third insulation board and the first insulation board, and between the third insulation board and the second insulation board, to cover the gaps between the third insulation board and the first and second insulation boards.

[0011] Furthermore, the first fixing ring is circular, and a first sliding groove and a second sliding groove are provided on the first fixing ring. The bottom end of the third insulation board is engaged in the first sliding groove. The longitudinal section of the second sliding groove is convex. The first insulation board, the second insulation board and the fourth insulation board are slidably connected to the second sliding groove respectively.

[0012] Furthermore, the top of each insulation board in the insulation board assembly is provided with a slot, and a locking block is provided on the second fixing ring. The locking block engages with the slot, and a connecting hole is provided on the periphery of the slot. A connecting hole is provided on the second fixing ring, and a connector is provided in the connecting hole and the connecting hole.

[0013] Furthermore, the card slot includes a first card slot and a second card slot, the first card slot is disposed between the two second card slots, the card block includes a first card block and a second card block, the second card block is engaged in the second card slot, and the end of the connector abuts against the second card block.

[0014] Furthermore, the top end of the insert is located inside the second fixing ring, and the bottom end of the insert is located inside the first fixing ring.

[0015] A manufacturing process for carbon-carbon composite spliced ​​insulation cylinders, applicable to the aforementioned carbon-carbon composite spliced ​​insulation cylinders, includes the following steps:

[0016] S1 Prefabrication: Three-dimensionally woven carbon fiber needle-punched into the required shape of fabric, the woven prefabrication is cured at high temperature, and after curing, the prefabrication is cut into equal parts.

[0017] S2 Preform Densification: Densification of carbon fiber insulation cylinders was achieved by chemical vapor deposition.

[0018] S3 High-Temperature Heat Treatment: High-temperature graphitization treatment of carbon-carbon composite raw materials;

[0019] S4 machining: The tenon and mortise joints of the carbon carbon composite material are machined using a CNC machining center. After machining, the parts are polished to form the insulation board in the insulation board assembly and the first and second fixing rings in the fixing unit.

[0020] S5 Assembly: Insert the insulation board in the insulation board group into the first fixing ring, and connect the insulation boards in the insulation board group in sequence through the connecting components. Then, snap the second fixing ring onto the top of the insulation board in the insulation board group.

[0021] Compared with the prior art, the comprehensive effects brought about by the present invention include:

[0022] (1) Set up first insulation board, second insulation board, third insulation board and fourth insulation board with different structures, and connect them in sequence through connecting components to form the side wall of cylindrical insulation cylinder. While strengthening the connection strength between each insulation board in the insulation board group, the connecting components play the role of shielding the splicing gap between the insulation boards in the insulation board group, enhancing the overall insulation effect of the insulation cylinder and reducing the loss of heat from the gap.

[0023] (2) The upper and lower ends of the spliced ​​insulation cylinder are fixed by the first fixing ring and the second fixing ring respectively, which further increases the splicing effect between the insulation boards in the insulation board group, fixes and limits the insulation boards, ensures the sealing effect of the gaps, and improves the insulation effect.

[0024] (3) A connector is provided. The end of the connector is pressed against the surface of the second card block. At the same time, the second card block presses against the protrusion between the first card slot and the second card slot, thereby pressing against the first card block. This makes the second fixing ring tightly connected to the inner and outer surfaces of the side wall of the insulation cylinder, further enhancing the connection strength between the insulation boards in the insulation cylinder, reducing the splicing gap, and ensuring that the insert and slot are tightly connected, thereby improving the blocking and sealing effect of the gap and improving the insulation performance. Attached Figure Description

[0025] Figure 1 This is a partial cross-sectional view of the carbon-carbon composite spliced ​​insulation cylinder according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall external structure of the carbon-carbon composite spliced ​​insulation cylinder according to an embodiment of the present invention;

[0027] Figure 3 for Figure 2 Schematic diagram of cross-section along the middle AA direction;

[0028] Figure 4 This is a schematic diagram of the first fixing ring structure according to an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the fourth insulation board and the first fixing ring connection end face in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the first insulation board and the first fixing ring snapping end face in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the connection end face between the third insulation board and the first fixing ring in an embodiment of the present invention;

[0032] Figure 8 This is a top view schematic diagram of the assembled structure of the insulation cylinder according to an embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the second fixing ring structure according to an embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the card slot structure according to an embodiment of the present invention;

[0035] Figure 11 This is a partial structural diagram of the connection between the insulation board and the second fixing ring in an embodiment of the present invention;

[0036] Figure 12 This is a top view of the structure formed by splicing together a thermal insulation cylinder according to another embodiment of the present invention;

[0037] Figure 13 This is a schematic diagram of the overall external structure of a carbon-carbon composite spliced ​​insulation cylinder according to another embodiment of the present invention.

[0038] Legend: 1. Insulation unit; 2. Fixing unit; 3. First insulation board; 4. Second insulation board; 5. Third insulation board; 6. Fourth insulation board; 7. First fixing ring; 8. Second fixing ring; 9. First connecting component; 10. Second connecting component; 11. First sliding groove; 12. Second sliding groove; 13. Connecting hole; 14. Connecting hole; 15. Connector; 16. First slot; 17. Second slot; 18. First locking block; 19. Second locking block; 20. First slot; 21. Second slot. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0040] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Terms such as "upper," "lower," "left," "right," and "top" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are used only for the convenience of describing the invention and for simplification, and 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 a limitation of the invention.

[0041] like Figures 1 to 13 As shown, a carbon-carbon composite spliced ​​insulation cylinder includes an insulation unit 1 and a fixing unit 2. The insulation unit 1 includes an insulation board assembly, which includes a first insulation board 3, a second insulation board 4, a third insulation board 5, and a fourth insulation board 6. All insulation boards in the insulation board assembly have an arc-shaped structure. The insulation unit 1 also includes a connecting component. The insulation boards in the insulation board assembly are spliced ​​together by the connecting component to form the side wall of the insulation cylinder. The fixing unit 2 includes a first fixing ring 7 and a second fixing ring 8. The first fixing ring 7 and the second fixing ring 8 are respectively disposed at both ends of the insulation board assembly to limit and fix the insulation boards in the insulation board assembly.

[0042] The insulation boards 3, 4, 5, and 6, each with a different structure, are connected and spliced ​​sequentially to form the sidewall of a cylindrical insulation cylinder. This strengthens the connection between the insulation boards in the insulation board assembly, while the connecting components also shield the gaps between the insulation boards, enhancing the overall insulation effect of the insulation cylinder and reducing heat loss from the gaps. Furthermore, the upper and lower ends of the assembled insulation cylinder are fixed by the first fixing ring 7 and the second fixing ring 8, respectively, further increasing the splicing effect between the insulation boards in the insulation board assembly, fixing and limiting the insulation boards, ensuring the sealing effect of the gaps, and improving the insulation effect.

[0043] In this embodiment of the carbon-carbon composite splicing insulation cylinder, the connecting component is an arc-shaped insert. The arc of the insert is the same as the arc of the insulation board in the insulation board assembly. The left and right sides of the insulation board in the insulation board assembly are respectively provided with slots for inserting the insert. The slots are arc-shaped and the arc of the slots is the same as the arc of the insert.

[0044] Preferably, the width of the insert is twice the width of the slot, so that the connection strength between the insert and the two adjacent insulation boards is the same. At the same time, the above arrangement facilitates the installation of the insert and the slot. The insert is directly opposite the gap between the two adjacent insulation boards, and the joint between the insert and the splicing surface of the insulation board is tighter, thereby achieving a better shielding and sealing effect and preventing heat loss.

[0045] In the carbon-carbon composite splicing insulation cylinder of this embodiment, the first fixing ring 7 is circular, and the first fixing ring 7 is provided with a first sliding groove 11 and a second sliding groove 12. The bottom end of the third insulation plate 5 is engaged in the first sliding groove 11, and the longitudinal section of the second sliding groove 12 is convex. The first insulation plate 3, the second insulation plate 4 and the fourth insulation plate 6 are slidably connected to the second sliding groove 12 respectively.

[0046] Specifically, the bottom of the first insulation board 3, the second insulation board 4 and the fourth insulation board 6 are all set as second sliders that match the second slide groove 12, and the bottom of the third insulation board 5 is set as a first slider that matches the first slide groove 11.

[0047] In the carbon-carbon composite splicing insulation cylinder of this embodiment, the connecting components include a first connecting component 9, and a plurality of fourth insulation boards 6 are provided. The first connecting component 9 is provided between two adjacent fourth insulation boards 6 to cover the gap between the fourth insulation boards 6.

[0048] Specifically, through experiments testing different temperatures, different scenarios, and different numbers of splicing boards, it was found that when the number of insulation boards in the insulation board group is ≥20, the thermal expansion has little impact on the insulation cylinder, but the splicing difficulty is greater and the preparation cycle is longer; when the number of insulation boards in the insulation board group is <6, the insulation boards will deform during the deposition and processing, resulting in large gaps after splicing. In this embodiment, insulation boards in 8 insulation board groups are set for splicing the insulation cylinder.

[0049] In the carbon-carbon composite splicing insulation cylinder of this embodiment, a first connecting component 9 is provided between the first insulation board 3 and the adjacent fourth insulation board 6, and a first connecting component 9 is provided between the second insulation board 4 and the adjacent fourth insulation board 6, so as to cover the gap between the first insulation board 3 and the adjacent fourth insulation board 6, and the gap between the second insulation board 4 and the adjacent fourth insulation board 6.

[0050] Specifically, the two sides of the fourth insulation board 6 are respectively provided with first slots 20 that match the first connecting component 9, and the surface of the second insulation board 4, the first insulation board 3 and the fourth insulation board 6 are respectively provided with first slots 20 that match the first connecting component 9.

[0051] Preferably, the length of the first connecting component 9 and the first slot 20 is less than the height of the first insulation board 3, the second insulation board 4 and the fourth insulation board 6. The first connecting component 9, i.e. the first insert, is inserted into the first slot 20 from the side of the insulation board. The above arrangement reduces the damage of the first slot 20 to the integrity of the insulation board, making the first slot 20 a closed slot, thereby making the first insert and the first slot 20 more tightly connected and improving the sealing effect.

[0052] In the carbon-carbon composite splicing insulation cylinder of this embodiment, the connecting component includes a second connecting component 10. The second connecting component 10 is disposed between the third insulation board 5 and the first insulation board 3, and between the third insulation board 5 and the second insulation board 4, so as to cover the gaps between the third insulation board 5 and the first insulation board 3 and the second insulation board 4.

[0053] Specifically, on the two sides where the third insulation board 5 is spliced ​​with the first insulation board 3 and the second insulation board 4, a second slot 21 matching the second connecting component 10 is respectively opened. Correspondingly, on the splicing surface where the first insulation board 3 and the second insulation board 4 contact the third insulation board 5, a second slot 21 matching the second connecting component 10 is opened.

[0054] When installing the insulation board in the insulation board assembly onto the first fixing ring 7, insert the first connecting component 9 into the first slot 20 of the first insulation board 3, place the first insulation board 3 into the first sliding groove 11, and then slide the first insulation board 3 counterclockwise until the second slider at the bottom of the first insulation board 3 is fully inserted into the second sliding groove 12; insert the first connecting component 9 into the first slot 20 on the first side of a fourth insulation board 6, place the fourth insulation board 6 into the first sliding groove 11, and push the fourth insulation board 6 clockwise so that the fourth insulation board 6 slides along the second sliding groove 12 until the first slot 20 on the second side of the fourth insulation board 6 is fully inserted into the first connecting component 9 inserted on the first insulation board 3; then, place the remaining... The four fourth insulation boards 6 are installed sequentially according to the above steps until the first slot 20 of the next fourth insulation board 6 is fully inserted into the first connecting component 9 of the previous fourth insulation board 6; the second insulation board 4 is placed into the first sliding groove 11, and the second insulation board 4 is pushed clockwise until the first slot 20 of the second insulation board 4 is fully inserted into the first connecting component 9 of the fourth insulation board 6, and at the same time the second insulation board 4 is fully inserted into the second sliding groove 12; finally, the third insulation board 5 is inserted into the first sliding groove 11, and the two second connecting components 10 are respectively inserted into the second slot 21 between the third insulation board 5 and the first insulation board 3 and the second insulation board 4, so as to realize the assembly of the side wall of the insulation cylinder with the first fixing ring 7.

[0055] Assemble the insulation board according to the above steps based on the insulation board structure provided in this application. This facilitates the tight insertion of inserts and slots between the insulation boards, thereby achieving the effect of the inserts blocking and sealing the splicing gaps and improving the overall insulation performance of the insulation cylinder.

[0056] In the carbon-carbon composite splicing insulation cylinder of this embodiment, the top of the insulation board in the insulation board group is provided with a slot, the second fixing ring 8 is provided with a block, the block is engaged with the slot, the periphery of the slot is provided with a connecting hole 13, the second fixing ring 8 is provided with a connecting hole 14, and a connector 15 is provided in the connecting hole 13 and the connecting hole 14.

[0057] Preferably, each insulation board in the insulation board assembly has a slot, and a number of locking blocks are provided on the corresponding second fixing ring 8. Connecting holes 13 are respectively provided on the inner and outer surfaces of the insulation board, and connecting holes 14 are respectively provided on the inner and outer surfaces of the edge of the second fixing ring 8.

[0058] In the carbon-carbon composite splicing insulation cylinder of this embodiment, the slot includes a first slot 16 and a second slot 17. The first slot 16 is disposed between the two second slots 17. The block includes a first block 18 and a second block 19. The second block 19 is engaged in the second slot 17. The end of the connector 15 abuts against the second block 19.

[0059] Specifically, the slot is located at the top center of the insulation board within the insulation board assembly, and both the slot and the block are arc-shaped.

[0060] With the above configuration, after the side wall of the insulation cylinder is assembled, the first slot 16 cooperates with the first block 18, and the second slot 17 cooperates with the second block 19 to attach the second fixing ring 7 to the assembled side wall of the insulation cylinder. The inner and outer connecting holes 13 and connecting holes 14 are aligned and fixed by the connector 15. Preferably, the connecting hole 13 is a threaded hole, the connecting hole 14 is a threaded hole with a countersunk hole, and the connector 15 is a bolt. By tightening the bolt, the ends of the bolts on the inner and outer sides press against the surfaces of the second blocks 19 on the inner and outer sides, respectively. At the same time, the second blocks 19 press against the protrusion between the first slot 16 and the second slot 17, thereby pressing against the first block 18. This makes the second fixing ring 8 tightly connected to the inner and outer surfaces of the side wall of the insulation cylinder, further enhancing the connection strength between the insulation boards inside the insulation cylinder, reducing the splicing gaps, and ensuring that the inserts and slots are tightly inserted, improving the sealing effect of the gaps and improving the insulation performance.

[0061] In the carbon-carbon composite splicing insulation cylinder of this embodiment, the top end of the insert is located inside the second fixing ring 8, and the bottom end of the insert is located inside the first fixing ring 7.

[0062] The above arrangement connects the two ends of the insert to the first fixing ring 7 and the second fixing ring 8, so that the sealing effect of the insert is combined with the fixing unit 2. Through the fixing effect, the connection between the parts of the insulation cylinder is tighter, and the insulation effect is improved.

[0063] like Figure 12 and Figure 13As shown, preferably, the slots are arranged between the insulation boards, the second slot 21 is located in the first slot 16, the top of the second connecting component 10 is flush with the bottom surface of the first slot 16, and eight sets of connecting holes 13, connecting holes 14 and connecting pieces 15 are provided. Each set includes four connecting holes 13, four connecting holes 14 and four connecting pieces 15, and two connecting holes 13 on the same side are symmetrically arranged about the splicing gap. With the above arrangement, the bolts tighten the edge of the insulation board and the second fixing ring 8 respectively, so that the splicing surfaces between two adjacent insulation boards are pressed together, and at the same time, the connection strength between the second fixing ring 8 and the top of the insulation cylinder is increased, further increasing the connection between the insulation boards in the insulation cylinder, reducing gaps and improving insulation performance.

[0064] Preferably, a threaded hole is made on the outer surface of the insulation board, and a bolt is installed in the threaded hole. The end of the bolt abuts against the outer surface of the insert. By tightening the bolt, the end of the bolt is pressed against the insert, so that the insert and the slot are tightly connected, which enhances the connection strength between the insulation boards, reduces gaps, and improves the insulation performance of the insulation cylinder.

[0065] A manufacturing process for carbon-carbon composite spliced ​​insulation cylinders, applicable to the aforementioned carbon-carbon composite spliced ​​insulation cylinders, includes the following steps:

[0066] S1 Prefabricated Body: Three-dimensional woven carbon fiber needle-punched into fabric of the required shape, the woven prefabricated body is cured at high temperature, and after curing, the prefabricated body is cut into equal parts; because it is a splicing form, the remaining amount is larger than the overall prefabricated body. The woven prefabricated body is cured at high temperature to prevent the product from deforming during circulation and transportation. After curing, the prefabricated body is cut into eight equal parts.

[0067] S2 Preform Densification: Chemical vapor deposition furnace is used to deposit and densify carbon fiber insulation cylinders; chemical vapor infiltration process is adopted to make the densification of the preform more uniform, and the density of the preform reaches the temperature that can be subjected to high-temperature heat treatment in one deposition.

[0068] S3 High-Temperature Heat Treatment: High-temperature graphitization treatment of carbon-carbon composite raw materials;

[0069] S4 machining: The tenon and mortise of the carbon carbon composite material are machined using a CNC machining center. After machining, the surface is polished to make it smooth and burr-free, forming the insulation board in the insulation board assembly and the first fixing ring 7 and the second fixing ring 8 in the fixing unit.

[0070] Machining requires strict dimensional control over the areas that need to be spliced, especially the longitudinal surfaces. This ensures that the gaps are small and the contact area is large after splicing, which is beneficial to the insulation performance of the carbon carbon insulation cylinder. Divided into 8 parts, the splicing petals are small in volume and have a small radius. During processing, the splicing plate is machined by a CNC machining center. Each surface and splicing point has individual dimensional control processing, so there is no product deformation problem during use in the single crystal thermal field.

[0071] S5 Assembly: Insert the insulation board in the insulation board group into the first fixing ring 7, and connect the insulation boards in the insulation board group in sequence through the connecting components. Then, snap the second fixing ring 8 onto the top of the insulation board in the insulation board group.

[0072] If a conventional carbon-carbon insulation cylinder becomes unusable due to silicon vapor corrosion during use, a new carbon-carbon insulation cylinder needs to be replaced, increasing operating costs. In contrast, with the carbon-carbon composite spliced ​​insulation cylinder described in this application, if partial corrosion occurs, only one section needs to be removed and replaced, eliminating the need to replace the rest and saving on operating costs.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "rotation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] Although embodiments of the invention have been shown and described in detail, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A carbon-carbon composite spliced ​​thermal insulation cylinder, characterized in that, The device includes an insulation unit and a fixing unit. The insulation unit includes an insulation board assembly, which includes a first insulation board, a second insulation board, a third insulation board, and a fourth insulation board. All insulation boards in the insulation board assembly have an arc-shaped structure. The insulation unit also includes a connecting component. The insulation boards in the insulation board assembly are spliced ​​together by the connecting component to form the sidewall of the insulation cylinder. The fixing unit includes a first fixing ring and a second fixing ring. The first fixing ring and the second fixing ring are respectively disposed at both ends of the insulation board assembly to limit and fix the insulation boards in the insulation board assembly. The connecting component is an arc-shaped insert, the arc of which is the same as the arc of the insulation board in the insulation board assembly. The left and right sides of the insulation board in the insulation board assembly are respectively provided with slots for inserting the insert, the slots are arc-shaped, and the arc of the slots is the same as the arc of the insert. The connecting component includes a first connecting component, and a plurality of fourth insulation boards are provided. The first connecting component is provided between two adjacent fourth insulation boards to cover the gaps between the fourth insulation boards. The first connecting component is provided between the first insulation board and the adjacent fourth insulation board, and the first connecting component is provided between the second insulation board and the adjacent fourth insulation board, so as to cover the gap between the first insulation board and the adjacent fourth insulation board, and the gap between the second insulation board and the adjacent fourth insulation board. The connecting component includes a second connecting component, which is disposed between the third insulation board and the first insulation board, and between the third insulation board and the second insulation board, to cover the gaps between the third insulation board and the first insulation board and the second insulation board. The first fixing ring is circular, and a first sliding groove and a second sliding groove are provided on the first fixing ring. The bottom end of the third insulation board is engaged in the first sliding groove. The longitudinal section of the second sliding groove is convex. The first insulation board, the second insulation board and the fourth insulation board are slidably connected to the second sliding groove respectively. The top of each insulation board in the insulation board assembly is provided with a slot, and a locking block is provided on the second fixing ring. The locking block engages with the slot, and a connecting hole is provided on the periphery of the slot. A connecting hole is provided on the second fixing ring, and a connector is provided in the connecting hole and the connecting hole. The top end of the insert is located inside the second fixing ring, and the bottom end of the insert is located inside the first fixing ring; When installing the insulation board in the insulation board assembly onto the first fixing ring, insert the first connecting component into the first slot of the first insulation board, place the first insulation board into the first sliding groove, and then slide the first insulation board counterclockwise until the second slider at the bottom of the first insulation board is fully inserted into the second sliding groove; insert the first connecting component into the first slot on the first side of a fourth insulation board, place the fourth insulation board into the first sliding groove, and push the fourth insulation board clockwise to slide it along the second sliding groove until the first slot on the second side of the fourth insulation board is fully engaged with the first connecting component inserted into the first insulation board; then, place the remaining... The remaining fourth insulation boards are installed sequentially according to the above steps until the first slot of the next fourth insulation board is fully inserted into the first connecting component of the previous fourth insulation board; the second insulation board is placed into the first sliding groove, and the second insulation board is pushed clockwise until the first slot of the second insulation board is fully inserted into the first connecting component of the fourth insulation board, and at the same time the second insulation board is fully inserted into the second sliding groove; finally, the third insulation board is inserted into the first sliding groove, and the two second connecting components are respectively inserted into the second slots between the third insulation board and the first and second insulation boards to realize the assembly of the insulation cylinder side wall and the first fixing ring.

2. The carbon-carbon composite spliced ​​insulation cylinder according to claim 1, characterized in that, The card slot includes a first card slot and a second card slot, the first card slot being disposed between the two second card slots, the card block including a first card block and a second card block, the second card block being engaged in the second card slot, and the end of the connector abutting against the second card block.

3. A manufacturing process for a carbon-carbon composite splicing insulation cylinder, applicable to the carbon-carbon composite splicing insulation cylinder according to any one of claims 1-2, characterized in that, Includes the following steps: S1 Prefabrication: Three-dimensionally woven carbon fiber needle-punched into the required shape of fabric, the woven prefabrication is cured at high temperature, and after curing, the prefabrication is cut into equal parts. S2 Preform Densification: Densification of carbon fiber insulation cylinders was achieved by chemical vapor deposition. S3 High-Temperature Heat Treatment: High-temperature graphitization treatment of carbon-carbon composite raw materials; S4 machining: The tenon and mortise joints of the carbon carbon composite material are machined using a CNC machining center. After machining, the parts are polished to form the insulation board in the insulation board assembly and the first and second fixing rings in the fixing unit. S5 Assembly: Insert the insulation board in the insulation board group into the first fixing ring, and connect the insulation boards in the insulation board group in sequence through the connecting components. Then, snap the second fixing ring onto the top of the insulation board in the insulation board group.

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