Thermal insulation hoop for producing single crystal by Czochralski method

Abstract

The utility model discloses a thermal insulation hoop for producing single crystals by a czochralski method, and particularly relates to the technical field of single crystal production, the thermal insulation hoop comprises a plurality of upper arc-shaped plates and lower arc-shaped frames which are matched with the outer walls of an upper thermal insulation cylinder and a lower thermal insulation cylinder of the single crystals, the upper arc-shaped plates are positioned at the tops of the lower arc-shaped frames, and the upper arc-shaped plates and the lower arc-shaped frames are of an integrated structure; connecting plates are integrally arranged at the two ends of the upper arc-shaped plates and the two ends of the lower arc-shaped frames, and locking connecting structures are arranged on the surfaces of the two connecting plates. According to the utility model, the heat preservation hoop structure formed by splicing the plurality of upper arc-shaped plates and the plurality of lower arc-shaped frames can be used for connecting and sealing a gap at the joint of the upper heat preservation cylinder and the lower heat preservation cylinder, so that the difficulty of crystal pulling caused by unstable temperature gradient of a thermal field due to the heat leakage problem of the thermal field is avoided; and meanwhile, the whole thermal field can be conveniently disassembled, and a plurality of upper arc-shaped plates and a plurality of lower arc-shaped frames can be conveniently connected.

Description

Technical Field

[0001] The utility model relates to the technical field of single crystal production, and more specifically, to a heat preservation hoop for producing single crystal by a Czochralski method. Background Art

[0002] In the process of producing single crystal silicon by the Czochralski method, the single crystal silicon material needs to be placed inside the thermal field formed by the upper insulation tube and the lower insulation tube. However, there are gaps in the thermal field of single crystal growth by the Czochralski method, gaps at the joints between the upper insulation tube and the middle insulation tube, and heat leakage in the thermal field, which leads to unstable temperature gradient of the thermal field and brings difficulties to crystal pulling. At the same time, heat leakage leads to decreased thermal insulation of the thermal field, increased power consumption of the furnace, and increased crystal pulling cost, which is not conducive to cost reduction and efficiency improvement in the photovoltaic industry, and is not conducive to the overall disassembly and assembly of the thermal field. Therefore, it is necessary to use insulation hoops to avoid heat leakage in the thermal field, which leads to unstable temperature gradient of the thermal field and brings difficulties to crystal pulling.

[0003] The utility model patent with patent application number CN202221062839.4 discloses a high-strength clamp for facilitating the disassembly and assembly of the insulation tube of a single crystal furnace, comprising four arc plates matched with the outer wall of the insulation tube, with locking plates and rib plates connected to both ends of the arc plates; the locking plates of two adjacent arc plates are connected by fastening bolts, and the four arc plates form a complete circular clamp, which is sleeved on the outer wall of the insulation tube. The advantage of this structure is that it can not only firmly fix the insulation felt and the insulation tube together, but also facilitate the disassembly and removal of the insulation tube, thereby improving work efficiency.

[0004] However, in actual use, the clamp of the structure utilizes multiple arc plates and connects the locking plates by fastening bolts to form a clamp structure. However, the bolt connection method is very laborious both in installation and removal, and the bolts are prone to thread slippage after long-term use. In view of this, the utility model proposes an insulation clamp for producing single crystals by the direct pulling method. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a heat preservation hoop for producing single crystals by the Czochralski method to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an insulation hoop for producing single crystals by the direct pulling method, comprising a plurality of upper arc plates and a lower arc frame matched with the outer walls of an upper insulation tube and a lower insulation tube of the single crystal, wherein the upper arc plates are located at the top of the lower arc frames, and the upper arc plates and the lower arc frames are an integrated structure, and connecting plates are integrally provided at both ends of the plurality of upper arc plates and the plurality of lower arc frames, and an insulation hoop structure is formed between the plurality of upper arc plates and the plurality of lower arc frames, wherein the upper arc plates are attached to the outer wall of the upper insulation tube of the single crystal, and the lower arc frame is attached to the outside of the lower insulation tube of the single crystal, and the inner walls of the plurality of upper arc plates and the plurality of lower arc frames are provided with sealing strips.

[0007] It can be seen that in the above structure, the insulation hoop structure composed of multiple upper arc plates and multiple lower arc frames can connect and seal the gap at the joint of the upper insulation tube and the lower insulation tube, avoiding heat leakage problems in the hot field, resulting in unstable temperature gradient of the hot field, which brings difficulties to crystal pulling, and at the same time facilitates the disassembly of the entire hot field.

[0008] In order to facilitate the connection between the plurality of upper arc plates and the plurality of lower arc frames, thereby forming a heat preservation hoop structure, preferably, the surfaces of the two connecting plates are provided with a locking connection structure, and the locking connection structure specifically includes a locking block, a slide groove is provided on the surface of one of the connecting plates, and the locking block is slidably installed inside the slide groove, a screw is provided on one side of the locking block inside the slide groove, and an adjusting block is provided at one end of the screw, a clamping block is provided on the surface of the locking block, and an anti-slip groove is provided on the outer wall of the clamping block; the locking connection structure also includes a support block fixedly arranged on the other connecting plate, the top and bottom of the support block are both rotatably installed with a sleeve plate through an axle pin, and an extension plate is provided at one end of the sleeve plate, a clamping frame adapted to the clamping block structure is rotatably provided between the two extension plates through the axle pin, and an anti-slip strip adapted to the anti-slip groove structure is installed on the inner wall of the clamping frame, a cavity is provided inside the sleeve plate, the extension plate is slidably connected inside the sleeve plate, and a movable plate is provided at one end of the extension plate inside the sleeve plate, and two tension springs are provided at one end of the movable plate.

[0009] Technical effects and advantages of the utility model:

[0010] 1. By setting a locking connection structure, the extension plate is slid inside the sleeve plate and the movable plate stretches the tension spring. At the same time, the sleeve plate and the card frame are rotated to sleeve the card frame on the outside of the card block. The tension spring is reset after being stretched, so that the extension plate can tighten the card frame sleeved on the outside of the card block. The rotation of the screw causes the locking block to move away from the card frame, further tightening the card block and the card frame, so that multiple upper arc plates and multiple lower arc frames are tightly connected. This structure reduces the use of bolts, is very convenient for installation or removal, and reduces the phenomenon of bolt thread slippage;

[0011] 2. After the card frame is sleeved on the outside of the card block, the anti-slip strip can be inserted into the anti-slip groove, thereby reducing the card frame from detaching from the outside of the card block;

[0012] 3. An insulation hoop structure is formed between multiple integrated upper arc plates and lower arc frames. The insulation hoop structure can connect and seal the gap at the joint of the upper insulation tube and the lower insulation tube, avoiding heat leakage in the thermal field, resulting in unstable temperature gradient in the thermal field and bringing difficulties to crystal pulling, and at the same time facilitating the disassembly of the entire thermal field. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 2 It is a schematic diagram of the structure of a single upper arc plate and a lower arc frame of the utility model.

[0015] Figure 3 It is a schematic diagram of the connection structure of two connection plates of the utility model.

[0016] Figure 4 For the utility model Figure 3 Enlarged structural diagram at A in the middle.

[0017] Figure 5 It is a schematic diagram of the connection structure between the card frame and the card block of the utility model.

[0018] Figure 6 It is a schematic diagram of the connection structure between the extension plate and the sleeve plate of the utility model.

[0019] The accompanying drawings are marked as follows: 1. upper arc plate; 2. lower arc frame; 3. connecting plate; 4. sealing strip; 5. locking block; 6. slide groove; 7. screw; 8. adjustment block; 9. clamping block; 10. anti-slip groove; 11. support block; 12. sleeve plate; 13. extension plate; 14. clamping frame; 15. anti-slip strip; 16. movable plate; 17. tension spring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] As attached Figure 1-6An insulation hoop for producing single crystals by the direct pulling method is shown, comprising a plurality of upper arc plates 1 and a lower arc frame 2 which cooperate with the outer walls of an upper insulation tube and a lower insulation tube of the single crystal, the upper arc plate 1 being located at the top of the lower arc frame 2, and the upper arc plate 1 and the lower arc frame 2 are an integrated structure, connecting plates 3 are integrally provided at both ends of the plurality of upper arc plates 1 and the plurality of lower arc frames 2, an insulation hoop structure is formed between the plurality of upper arc plates 1 and the plurality of lower arc frames 2, wherein the upper arc plate 1 is attached to the outer wall of the upper insulation tube of the single crystal, and the lower arc frame 2 is attached to the outside of the lower insulation tube of the single crystal, and the inner walls of the plurality of upper arc plates 1 and the plurality of lower arc frames 2 are provided with sealing strips 4.

[0022] Specifically, in this structure, a single upper arc plate 1 and a lower arc frame 2 are an integrated structure, wherein the upper arc plate 1 is located on the outer wall of the upper insulation tube, and the lower arc frame 2 is located on the outer wall of the lower insulation tube, and an insulation hoop structure is formed between multiple integrated upper arc plates 1 and lower arc frames 2. The insulation hoop structure can connect and seal the gap at the joint of the upper insulation tube and the lower insulation tube, avoiding heat leakage problems in the thermal field, resulting in unstable temperature gradient in the thermal field, which brings difficulties to crystal pulling, and at the same time facilitates the disassembly of the entire thermal field.

[0023] In this embodiment, as shown in the attached Figure 3 , 4 , 5, 6, wherein the surfaces of the two connecting plates 3 are both provided with a locking connection structure, the locking connection structure specifically comprises a locking block 5, a sliding groove 6 is provided on the surface of one of the connecting plates 3, the locking block 5 is slidably installed inside the sliding groove 6, a screw rod 7 is provided on one side of the locking block 5 inside the sliding groove 6, and an adjusting block 8 is provided at one end of the screw rod 7, a clamping block 9 is provided on the surface of the locking block 5, and an anti-slip groove 10 is provided on the outer wall of the clamping block 9;

[0024] The locking connection structure also includes a support block 11 fixedly arranged on another connecting plate 3, and a sleeve plate 12 is rotatably installed on the top and bottom of the support block 11 through an axle pin, and an extension plate 13 is arranged at one end of the sleeve plate 12, and a card frame 14 adapted to the card block 9 structure is rotatably arranged between the two extension plates 13 through an axle pin, and an anti-slip strip 15 adapted to the anti-slip groove 10 structure is installed on the inner wall of the card frame 14, a cavity is arranged inside the sleeve plate 12, the extension plate 13 is slidably connected inside the sleeve plate 12, and a movable plate 16 is arranged inside the sleeve plate 12 at one end of the extension plate 13, and two tension springs 17 are arranged at one end of the movable plate 16.

[0025] Specifically, in this structure, the connecting plates 3 at both ends of the plurality of upper arc plates 1 and the plurality of lower arc frames 2 can be locked and connected, so that it is convenient to form a heat preservation hoop between the plurality of upper arc plates 1 and the plurality of lower arc frames 2, and it is also convenient to dismantle the plurality of upper arc plates 1 and the plurality of lower arc frames 2. Specifically, after the connecting plates 3 between the plurality of upper arc plates 1 and the plurality of lower arc frames 2 are docked, the operator pulls the extension plate 13 to make the extension plate 13 slide inside the sleeve plate 12, and makes the movable plate 16 stretch the tension spring 17. At the same time, by rotating the sleeve plate 12 and the clamping frame 14, the clamping frame 14 is sleeved on the outside of the clamping block 9. The tension spring 17 is reset after being stretched, so that the extension plate 13 can tighten the clamping frame 14 sleeved on the outside of the clamping block 9.

[0026] When the card frame 14 is sleeved on the outside of the card block 9, the anti-slip strip 15 can be inserted into the anti-slip groove 10, thereby reducing the card frame 14 from being detached from the outside of the card block 9. The operator rotates the screw 7 to move the locking block 5 away from the card frame 14, and further tightens the card block 9 and the card frame 14, so that the multiple upper arc plates 1 and the multiple lower arc frames 2 are tightly connected;

[0027] In summary, the locking connection structure replaces the current bolt connection structure, which is not only convenient for disassembly and assembly, but also reduces the occurrence of thread stripping of the bolts during long-term use.

[0028] Working principle of this utility model:

[0029] When the above structure is used, the upper arc plate 1 is placed on the outer wall of the upper insulation tube, and the lower arc frame 2 is placed on the outer wall of the lower insulation tube, and a plurality of upper arc plates 1 and lower arc frames 2 are connected to form an insulation hoop structure, which can connect and seal the gap at the joint of the upper insulation tube and the lower insulation tube, avoid the problem of heat leakage in the thermal field, and cause the unstable temperature gradient of the thermal field to bring difficulties to crystal pulling, and facilitate the disassembly of the thermal field as a whole;

[0030] When connecting the plurality of upper arc plates 1 and the lower arc frames 2, after docking the connection plates 3 between the plurality of upper arc plates 1 and the plurality of lower arc frames 2, the operator pulls the extension plate 13 to make the extension plate 13 slide inside the sleeve plate 12, and makes the movable plate 16 stretch the tension spring 17. At the same time, by rotating the sleeve plate 12 and the clamping frame 14, the clamping frame 14 is sleeved on the outside of the clamping block 9. The tension spring 17 is reset after being stretched, so that the extension plate 13 can tighten the clamping frame 14 sleeved on the outside of the clamping block 9.

[0031] When the card frame 14 is sleeved on the outside of the card block 9, the anti-slip strip 15 can be inserted into the anti-slip groove 10, thereby reducing the card frame 14 from detaching from the outside of the card block 9. The operator rotates the screw 7 to move the locking block 5 away from the card frame 14, and further tightens the card block 9 and the card frame 14, so that the multiple upper arc plates 1 and the multiple lower arc frames 2 are tightly connected.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat preservation hoop for producing single crystals by the Czochralski method, comprising a plurality of upper arc-shaped plates (1) and lower arc-shaped frames (2) matched with the outer walls of the upper heat preservation tube and the lower heat preservation tube of the single crystal, characterized in that: The upper arc plate (1) is located on the top of the lower arc frame (2), and the upper arc plate (1) and the lower arc frame (2) are an integrated structure, and connecting plates (3) are integrally provided at both ends of the plurality of upper arc plates (1) and the plurality of lower arc frames (2), wherein surfaces of the two connecting plates (3) are provided with locking connection structures.

2. The thermal insulation hoop for producing single crystal by Czochralski method according to claim 1, characterized in that: A heat-insulating hoop structure is formed between the plurality of upper arc-shaped plates (1) and the plurality of lower arc-shaped frames (2), wherein the upper arc-shaped plates (1) are attached to the outer wall of the upper heat-insulating cylinder of the single crystal, and the lower arc-shaped frames (2) are attached to the outside of the lower heat-insulating cylinder of the single crystal.

3. The thermal insulation hoop for producing single crystal by Czochralski method according to claim 1, characterized in that: The inner walls of the plurality of upper arc-shaped plates (1) and the plurality of lower arc-shaped frames (2) are all provided with sealing strips (4).

4. The thermal insulation hoop for producing single crystal by Czochralski method according to claim 1, characterized in that: The locking connection structure specifically comprises a locking block (5), wherein a sliding groove (6) is provided on the surface of one of the connecting plates (3), the locking block (5) is slidably mounted inside the sliding groove (6), a screw rod (7) is provided inside the sliding groove (6) on one side of the locking block (5), and an adjusting block (8) is provided at one end of the screw rod (7), a clamping block (9) is provided on the surface of the locking block (5), and an anti-slip groove (10) is provided on the outer wall of the clamping block (9).

5. The thermal insulation hoop for producing single crystal by Czochralski method according to claim 1, characterized in that: The locking connection structure also includes a support block (11) fixedly arranged on another connecting plate (3), a sleeve plate (12) being rotatably mounted on the top and bottom of the support block (11) via an axle pin, and an extension plate (13) being arranged at one end of the sleeve plate (12), a clamping frame (14) being rotatably mounted between the two extension plates (13) via an axle pin and being compatible with the clamping block (9) structure, and an anti-slipping strip (15) being compatible with the anti-slipping groove (10) structure being arranged on the inner wall of the clamping frame (14).

6. The insulation hoop for producing single crystal by Czochralski method according to claim 5, characterized in that: A cavity is provided inside the sleeve plate (12), the extension plate (13) is slidably connected inside the sleeve plate (12), and a movable plate (16) is provided inside the sleeve plate (12) at one end of the extension plate (13), and two tension springs (17) are provided at one end of the movable plate (16).

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