Top heat preservation device for thermal field of single crystal furnace

Abstract

The utility model discloses a single crystal furnace thermal field top thermal insulation device which comprises a bottom supporting plate, a thermal insulation ring felt, a carbon-carbon protection plate, a lifting screw rod, an outer guide cylinder and an inner guide cylinder, the heat preservation ring felt is arranged between the carbon-carbon protection plate and the bottom supporting plate, and the centers of the heat preservation ring felt, the carbon-carbon protection plate and the bottom supporting plate are all provided with installation openings for the inner guide cylinder to penetrate through. The outer guide cylinder is sleeved outside the inner guide cylinder, and the bottom openings of the outer guide cylinder and the inner guide cylinder coincide; the outer sides of the carbon-carbon protection plate, the heat preservation ring felt and the bottom supporting plate are fixed through a set of lifting screws longitudinally penetrating through the carbon-carbon protection plate, the heat preservation ring felt and the bottom supporting plate, and the bottoms of the lifting screws are installed on the annular top of the outer guide cylinder. The device adopts an integrated structural design, can effectively solve the heat leakage gap, introduces the graphite felt with better heat preservation performance to improve the heat preservation performance of the whole device, and can effectively avoid the influence of friction slag falling on coil base crystallization when the heat preservation device at the top of the thermal field is lifted.

Description

Technical Field

[0001] The utility model belongs to the field of single crystal silicon production, and in particular relates to a heat preservation device for the top of a single crystal furnace thermal field. Background Art

[0002] The existing thermal insulation device on the top of the thermal field adopts a split structure design, consisting of two major parts: an inner ring and an outer ring. Its structure is relatively complex and inconvenient to disassemble and assemble. The inner and outer rings are made of the same material, hard cured felt. This material has a certain strength and can meet the up and down movement of the inner ring and the outer guide tube, but the thermal insulation performance is poor. In actual use, the outer ring is fixed in position, and the inner ring is connected to the outer guide tube and can move up and down with the guide tube. Since the inner ring is separated from the outer ring, a certain gap must be reserved between the two to reduce the risk of the inner ring rubbing against the outer ring when moving up and down, but the abnormality of friction and debris between the two cannot always be avoided. At the same time, the existence of this gap can easily lead to heat loss, reducing the overall thermal insulation performance of the thermal insulation device on the top of the thermal field. Summary of the Invention

[0003] Purpose of the utility model: The technical problem to be solved by the utility model is to provide an integrated single crystal furnace hot field top insulation device in response to the deficiencies of the existing technology, which can effectively solve the design defects of the existing hot field top insulation device, improve the convenience of disassembly and assembly of the furnace, and the thermal insulation performance, and effectively avoid the influence of wear and slag falling of the hot field top insulation device on the crystallization of the furnace.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A single crystal furnace thermal field top insulation device comprises a bottom support plate, an insulation ring felt, a carbon-carbon guard plate, a lifting screw, an outer guide tube and an inner guide tube; the insulation ring felt is arranged between the carbon-carbon guard plate and the bottom support plate, and the centers of the three are each provided with an installation opening for the inner guide tube to pass through; the outer guide tube is sleeved on the outside of the inner guide tube, and the bottom openings of the outer guide tube and the inner guide tube coincide with each other; the outer sides of the carbon-carbon guard plate, the insulation ring felt and the bottom support plate are fixed by a group of lifting screws that longitudinally penetrate the three, and the bottom of the lifting screw is installed on the annular top of the outer guide tube.

[0006] Furthermore, a circumferential inner step is left at the inner bottom of the bottom support plate; the top of the outer guide tube is open and provided with a horizontal outer edge; the outer edge of the outer guide tube is stuck in the inner step and fixed by a lifting screw.

[0007] Furthermore, a sunken step is left on the outer side of the top of the bottom support plate, and the sunken step is filled with an annular thermal insulation felt.

[0008] Preferably, the thermal insulation ring felt is annular and has more than three layers.

[0009] Preferably, the thermal insulation felt has two or more layers.

[0010] Preferably, the width of the insulation felt is 1 / 3 to 2 / 3 of the width of the insulation ring felt.

[0011] Specifically, the inner walls of the carbon-carbon guard plate, the thermal insulation ring felt, the thermal insulation felt and the bottom support plate are flush with each other in the longitudinal direction and fit with the outer wall of the inner guide tube.

[0012] Specifically, the outer walls of the carbon-carbon guard plate, the thermal insulation ring felt, and the thermal insulation felt are flush longitudinally, and the outer wall of the bottom support plate protrudes horizontally from the outer walls of the above three.

[0013] Specifically, the carbon-carbon guard plate, the thermal insulation ring felt and the bottom support plate are respectively provided with a group of mounting holes in the circumferential direction for the lifting screw to pass through, and the mounting holes are aligned in sequence in the longitudinal direction.

[0014] Specifically, the upper opening of the inner guide tube is larger than the lower opening; the upper opening of the outer guide tube is larger than the lower opening; the lower opening of the inner guide tube is supported on the lower opening of the outer guide tube. Beneficial effects

[0015] This new single crystal furnace thermal insulation device utilizes an integrated structural design to effectively address heat leakage gaps. The introduction of graphite felt, which offers superior thermal insulation, enhances the overall thermal insulation performance of the device. This effectively prevents friction and slag from falling during the thermal insulation device's lifting, impacting crystallization on the furnace platform. By integrating the thermal insulation device with the outer guide tube, the thermal field is easily disassembled and assembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more apparent.

[0017] Figure 1 It is a schematic diagram of the overall structure of the thermal insulation device.

[0018] Figure 2 It is a structural diagram of a carbon-carbon guard plate, a thermal insulation ring felt and a bottom support plate connected through a lifting screw.

[0019] Wherein, each reference numeral represents:

[0020] 1-carbon-carbon guard plate; 2-insulation ring felt; 3-insulation felt; 4-bottom support plate; 41-inner step; 42-sinking step; 5-lifting screw; 6-outer guide tube; 61-outer extension edge; 7-inner guide tube. DETAILED DESCRIPTION

[0021] The present invention can be better understood according to the following embodiments.

[0022] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for the understanding and reading of those familiar with this technology. They are not used to limit the conditions for the implementation of the utility model and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the utility model without affecting the efficacy and purpose of the utility model. At the same time, terms such as "upper", "lower", "front", "back", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of the utility model without substantially changing the technical content.

[0023] Combine Figure 1 and Figure 2 The utility model discloses a heat preservation device for the top of the thermal field of a single crystal furnace, comprising a bottom support plate 4, a heat preservation ring felt 2, a carbon-carbon guard plate 1, a lifting screw 5, an outer guide tube 6 and an inner guide tube 7; the heat preservation ring felt 2 is arranged between the carbon-carbon guard plate 1 and the bottom support plate 4, and the centers of the three are each provided with an installation opening for the inner guide tube 7 to pass through; the outer guide tube 6 is sleeved on the outside of the inner guide tube 7, and the bottom openings of the outer guide tube 6 and the inner guide tube 7 coincide with each other; the outer sides of the carbon-carbon guard plate 1, the heat preservation ring felt 2 and the bottom support plate 4 are fixed by a group of lifting screws 5 that penetrate the three longitudinally, and the bottom of the lifting screw 5 is installed on the annular top of the outer guide tube 6.

[0024] Among them, an annular inner step 41 is left at the bottom inner side of the bottom support plate 4; the top of the outer guide tube 6 is open and has a horizontal outer edge 61; the outer edge 61 of the outer guide tube 6 is stuck in the inner step 41 and fixed by the lifting screw 5.

[0025] In some embodiments, a sunken step 42 is left on the outer side of the top of the bottom support plate 4 , and the sunken step 42 is filled with an annular thermal insulation felt 3 .

[0026] In this embodiment, the thermal insulation ring felt 2 is annular and has ten layers.

[0027] In this embodiment, the thermal insulation felt 3 has two layers.

[0028] In this embodiment, the width of the insulation felt 3 is 1 / 3 to 2 / 3 of the width of the insulation ring felt 2.

[0029] In this embodiment, the inner walls of the carbon-carbon guard plate 1 , the thermal insulation ring felt 2 , the thermal insulation felt 3 and the bottom support plate 4 are flush longitudinally and fit with the outer wall of the inner guide tube 7 .

[0030] In this embodiment, the outer walls of the carbon-carbon guard plate 1, the thermal insulation ring felt 2, and the thermal insulation felt 3 are flush longitudinally, and the outer wall of the bottom support plate 4 protrudes horizontally from the outer walls of the above three.

[0031] In this embodiment, the carbon-carbon guard plate 1, the thermal insulation ring felt 2 and the bottom support plate 4 are respectively provided with a group of mounting holes for the lifting screw 5 to pass through in the circumferential direction, and the mounting holes are aligned in sequence in the longitudinal direction.

[0032] In this embodiment, the upper opening of the inner guide tube 7 is larger than the lower opening; the upper opening of the outer guide tube 6 is larger than the lower opening; the lower opening of the inner guide tube 7 is supported on the lower opening of the outer guide tube 6.

[0033] The thermal insulation device of the present invention is composed of five components, forming an integrated structure. During assembly, an inner step 41 is provided on the lower part of the bottom support plate 4, which matches the upper outer extension 61 of the outer guide tube 6, and the small end of the bottom of the inner guide tube 7 matches the tapered small end inside the outer guide tube 6. The thermal insulation felt 3 and the thermal insulation ring felt 2 are installed in sequence, and the carbon-carbon protective plate 1 is installed on the top. Finally, the lifting screw 5 is symmetrically inserted into the countersunk hole on the outer edge of the outer guide tube 6, completely passing through the carbon-carbon protective plate 1, the thermal insulation ring felt 2, and the bottom support plate 4, and fixing the entire device in the longitudinal direction. The inner guide tube 7 also passes through the carbon-carbon protective plate 1, the thermal insulation ring felt 2, the center of the bottom support plate 4, and the lifting screw 5 in the horizontal direction to fix the entire device. It is precisely because of the fixation in the longitudinal and transverse directions that the entire device forms an integrated structure, which is more compact as a whole. During disassembly and assembly, the thermal insulation device on the top of the heat field is removed together with the outer guide by the outer guide disassembly and assembly vehicle, without the need for separate disassembly and assembly, and the disassembly and assembly efficiency is higher.

[0034] When the outer guide tube 6 is lifted and moved up and down by the lifting screw 5, the entire top insulation device moves with it, effectively avoiding the risk of slag drop associated with the split structure of existing devices. This thermal field top insulation device eliminates heat leakage gaps and is equipped with insulation felt for enhanced thermal insulation performance. The number of insulation felt layers can be flexibly increased or decreased based on actual usage needs. A carbon-carbon guard plate 1 is also installed on the top, which, through its own weight, compacts the insulation ring felt 2 and insulation felt 3, further improving thermal insulation performance.

[0035] The above special structure and innovative design make the disassembly and assembly convenience and thermal insulation performance of the thermal field top insulation device greatly improved, effectively avoiding the influence of wear and slag falling of the thermal field top insulation device on the crystallization of the furnace.

[0036] This utility model provides a concept and method for a thermal insulation device for the top of a single crystal furnace. There are many methods and approaches to implement this technical solution. The above is only a preferred embodiment of the utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the utility model, and such improvements and modifications should also be considered within the scope of protection of the utility model. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. A single crystal furnace thermal field top insulation device, characterized in that: It comprises a bottom support plate (4), a heat-insulating ring felt (2), a carbon-carbon guard plate (1), a lifting screw (5), an outer guide tube (6) and an inner guide tube (7); the heat-insulating ring felt (2) is arranged between the carbon-carbon guard plate (1) and the bottom support plate (4), and the centers of the three are all provided with a mounting opening for the inner guide tube (7) to pass through; the outer guide tube (6) is sleeved on the outside of the inner guide tube (7), and the bottom openings of the outer guide tube (6) and the inner guide tube (7) overlap; the outer sides of the carbon-carbon guard plate (1), the heat-insulating ring felt (2) and the bottom support plate (4) are fixed by a group of lifting screws (5) that longitudinally penetrate the three, and the bottom of the lifting screw (5) is mounted on the annular top of the outer guide tube (6).

2. The single crystal furnace thermal field top insulation device according to claim 1, characterized in that: The bottom inner side of the bottom support plate (4) is provided with an annular inner step (41); the top of the outer guide tube (6) is open and provided with a horizontal outer extension (61); the outer extension (61) of the outer guide tube (6) is inserted into the inner step (41) and fixed by a lifting screw (5).

3. The single crystal furnace thermal field top insulation device according to claim 1, characterized in that: A sunken step (42) is left on the outer side of the top of the bottom support plate (4), and the sunken step (42) is filled with an annular thermal insulation felt (3).

4. The single crystal furnace thermal field top insulation device according to claim 1, characterized in that: The thermal insulation ring felt (2) is annular and has more than three layers.

5. The single crystal furnace thermal field top insulation device according to claim 3, characterized in that: The thermal insulation felt (3) has more than two layers.

6. The single crystal furnace thermal field top insulation device according to claim 3, characterized in that: The width of the thermal insulation felt (3) is 1 / 3 to 2 / 3 of the width of the thermal insulation ring felt (2).

7. The single crystal furnace thermal field top insulation device according to claim 3, characterized in that: The inner walls of the carbon-carbon guard plate (1), the insulation ring felt (2), the insulation felt (3) and the bottom support plate (4) are flush in the longitudinal direction and fit with the outer wall of the inner guide tube (7).

8. The single crystal furnace thermal field top insulation device according to claim 3, characterized in that: The outer walls of the carbon-carbon guard plate (1), the thermal insulation ring felt (2), and the thermal insulation felt (3) are flush longitudinally, and the outer wall of the bottom support plate (4) protrudes horizontally from the outer walls of the above three.

9. The single crystal furnace thermal field top insulation device according to claim 1, characterized in that: The carbon-carbon guard plate (1), the heat-insulating ring felt (2), and the bottom support plate (4) are each provided with a group of mounting holes in the circumferential direction for the lifting screw (5) to pass through, and the mounting holes are aligned in sequence in the longitudinal direction.

10. The single crystal furnace thermal field top insulation device according to claim 1, characterized in that: The upper opening of the inner guide tube (7) is larger than the lower opening; the upper opening of the outer guide tube (6) is larger than the lower opening; the lower opening of the inner guide tube (7) is supported on the lower opening of the outer guide tube (6).

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