Energy-saving thermal field thermal insulation cylinder and single crystal furnace

Abstract

The utility model provides an energy-saving thermal field thermal insulation cylinder and a single crystal furnace. The energy-saving thermal field thermal insulation cylinder comprises a cylinder body; the heat insulation ring is arranged outside the cylinder in a sleeving mode, and a plurality of through holes communicating with the inner ring face and the outer ring face of the heat insulation ring are formed in the ring wall of the heat insulation ring; and the number of the heat insulation pieces is multiple, at least part of each heat insulation piece is contained in the corresponding through hole, and the heat insulation pieces are used for blocking openings in the sides, close to the outer ring face of the heat insulation ring, of the through holes so that heat insulation cavities can be formed between the inner walls of the heat insulation pieces and the outer side wall of the cylinder body. The utility model solves the problem of high maintenance cost due to the adoption of multiple layers of base felts in the single crystal furnace in the prior art for heat insulation.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, specifically to an energy-saving thermal insulation cylinder and a single crystal furnace. Background Technology

[0002] Single crystal furnaces are used to reduce and chemically react silicon materials at high temperatures to produce single crystal silicon. Existing single crystal furnaces typically use a thermal insulation cylinder with multiple layers of adhesive-based felt on the outside to enhance insulation performance, secured with clamps on the outermost layer. This multi-layered felt structure further prevents heat loss, forming an insulation barrier. However, with prolonged operation, the insulation performance of the adhesive-based felt gradually declines, and it becomes susceptible to oxidation and pulverization due to high temperatures. This not only reduces the insulation effect but also necessitates the complete removal and replacement of the multi-layered felt with new ones during maintenance, thus increasing maintenance costs.

[0003] As can be seen from the above, the existing technology has the problem of high maintenance cost when using multi-layer base felt insulation in single crystal furnaces. Utility Model Content

[0004] The main purpose of this utility model is to provide an energy-saving thermal insulation cylinder and a single crystal furnace, so as to solve the problem of high maintenance cost of using multi-layer base felt insulation in the existing single crystal furnace.

[0005] To achieve the above objectives, according to one aspect of the present invention, an energy-saving thermal insulation cylinder is provided, comprising: a cylinder body; a heat insulation ring, which is sleeved on the outside of the cylinder body, and the ring wall of the heat insulation ring has a plurality of through holes communicating with the inner and outer ring surfaces of the heat insulation ring; and a plurality of heat insulation components, each heat insulation component having at least a portion disposed in a corresponding through hole, the heat insulation component being used to block the opening of the through hole near the outer ring surface of the heat insulation ring, so that a heat insulation cavity is formed between the inner wall of the heat insulation component and the outer wall of the cylinder body.

[0006] Furthermore, the heat insulation ring includes a grid layer and a protective layer nested in sequence, with the protective layer fitted on the outer periphery of the grid layer. Through holes penetrate the grid layer and the protective layer, and multiple through hole arrays are arranged on the grid layer and the protective layer.

[0007] Furthermore, the shape of each heat insulation component is adapted to the shape of the corresponding through hole.

[0008] Furthermore, the energy-saving thermal insulation cylinder also includes a soft felt assembly, which is disposed between the cylinder body and the insulation ring.

[0009] Furthermore, the soft felt assembly includes multiple soft felt layers, which are arranged sequentially along the radial direction of the cylinder.

[0010] Furthermore, a structural adhesive layer is provided on the side of the soft felt assembly facing the cylinder or on the side away from the cylinder.

[0011] Furthermore, the protective layer is an alumina fiber layer.

[0012] Furthermore, the grid layer and the protective layer are integrally formed.

[0013] Furthermore, both the insulation component and the through-hole have hexagonal cross-sections.

[0014] According to another aspect of the present invention, a single crystal furnace is provided, comprising: the above-mentioned energy-saving thermal insulation cylinder; and a heater disposed at the bottom of the cylinder.

[0015] The energy-saving thermal insulation cylinder, utilizing the technical solution of this utility model, includes a cylinder body, a heat insulation ring, and heat insulation components. The heat insulation ring is sleeved on the outside of the cylinder body. Multiple through holes are formed on the ring wall of the heat insulation ring, connecting the inner and outer ring surfaces of the ring. Multiple heat insulation components are provided, with at least a portion of each component housed within a corresponding through hole. The heat insulation components are used to seal the openings of the through holes near the outer ring surface of the heat insulation ring, thereby forming a heat insulation cavity between the inner wall of the heat insulation component and the outer wall of the cylinder body. This is achieved by sleeved the heat insulation ring with multiple through holes on the outside of the cylinder body. In this design, multiple through-holes are formed on the heat insulation ring, creating a honeycomb structure on its surface. Heat from the cylinder must pass through these through-holes to be transferred to the heat insulation components. The air inside the through-holes has poor heat transfer efficiency, thus improving the insulation effect. Furthermore, the arrangement of multiple heat insulation components within the through-holes allows for the replacement of only the oxidized components after some components are heated and oxidized, avoiding the need to replace all components. This reduces maintenance costs and solves the problem of high maintenance costs associated with multi-layer felt insulation in existing single-crystal furnaces. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 This invention shows a structural schematic diagram of the energy-saving thermal insulation cylinder at one angle; and

[0018] Figure 2 It shows Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 This invention presents a structural schematic diagram of the energy-saving thermal insulation cylinder from another angle.

[0020] Figure 4 This invention shows a structural schematic diagram of the energy-saving thermal insulation cylinder at one angle.

[0021] Figure 5 A schematic diagram of the structure of the heat insulation component in this utility model is shown.

[0022] The above figures include the following reference numerals:

[0023] 10. Cylinder body; 20. Insulation ring; 21. Through hole; 22. Grid layer; 221. Deformation hole; 23. Protective layer; 30. Insulation component; 40. Soft felt assembly. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0027] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0028] To address the high maintenance costs associated with multi-layer felt insulation in existing single-crystal furnaces, this invention provides an energy-saving thermal insulation cylinder and a single-crystal furnace. The single-crystal furnace described below includes the energy-saving thermal insulation cylinder described below.

[0029] like Figures 1 to 3 as well as Figure 5 As shown, the energy-saving thermal insulation cylinder includes a cylinder body 10, a heat insulation ring 20, and heat insulation components 30. The heat insulation ring 20 is sleeved on the outside of the cylinder body 10, and multiple through holes 21 are formed on the ring wall of the heat insulation ring 20, connecting the inner and outer ring surfaces of the heat insulation ring 20. There are multiple heat insulation components 30, and at least a portion of each heat insulation component 30 is accommodated in the corresponding through hole 21. The heat insulation component 30 is used to block the opening of the through hole 21 near the outer ring surface of the heat insulation ring 20, so that a heat insulation cavity is formed between the inner wall of the heat insulation component 30 and the outer wall of the cylinder body 10.

[0030] By fitting a heat insulation ring 20 with multiple through holes 21 onto the outside of the cylinder 10, the multiple through holes 21 on the heat insulation ring 20 form a honeycomb structure on the surface of the entire heat insulation ring 20. The heat on the cylinder 10 needs to pass through the through holes 21 to be conducted to the heat insulation component 30. The air in the through holes 21 has poor heat transfer effect, thus improving the heat preservation effect. At the same time, the way in which multiple heat insulation components 30 are housed in the through holes 21 can replace only the oxidized heat insulation component 30 after some heat insulation components 30 are heated and oxidized, avoiding the need to replace all heat insulation components 30, thereby reducing maintenance costs.

[0031] like Figure 2 and Figure 4 As shown, the heat insulation ring 20 includes a grid layer 22 and a protective layer 23 nested in sequence, with the protective layer 23 sleeved on the outer periphery of the grid layer 22. Through holes 21 penetrate the grid layer 22 and the protective layer 23, and multiple through holes 21 are arrayed on the grid layer 22 and the protective layer 23.

[0032] Specifically, the arrangement of multiple through holes 21 in an array reduces the overall mass of the heat insulation ring 20. The array of through holes 21 along the circumference of the heat insulation ring 20 creates a hollow structure. Compared to the prior art where the heat insulation layer is directly attached to the outer periphery of the cylinder 10, this invention changes the solid-to-solid heat transfer to a solid-to-gas heat transfer, effectively mitigating heat loss. The protective layer 23 reduces wear on the grid layer 22 during use in the single crystal furnace, thereby extending the service life of the grid layer 22.

[0033] In this embodiment, the shape of each heat insulation element 30 is adapted to the shape of the corresponding through hole 21.

[0034] Specifically, the heat insulation component 30 can be adapted to the through hole 21 to effectively seal the through hole 21. In use, the heat insulation component 30 is placed into the through hole 21. The cooperation between the heat insulation component 30 and the through hole 21 can reduce heat loss and improve the heat preservation effect.

[0035] In this embodiment, the length of the through hole 21 is less than the thickness of the heat insulation member 30, so that after the heat insulation member 30 is inserted into the through hole 21, the side of the heat insulation member 30 facing the cylinder 10 is spaced apart from the cylinder 10.

[0036] In an optional embodiment of this utility model, the cross-sectional area of ​​the through hole 21 gradually decreases along the direction close to the heat insulation member 30, thereby preventing the heat insulation member 30 from being unable to form a heat insulation cavity when it is placed into the through hole 21 and fits against the cylinder 10.

[0037] In another optional embodiment of this utility model, the thickness of the heat insulation component 30 gradually decreases along the direction toward the cylinder 10. The heat insulation component 30 is approximately a frustum-shaped structure. The cross-sectional area of ​​the end of the heat insulation component 30 away from the cylinder 10 is slightly larger than the cross-sectional area of ​​the through hole 21. That is, after the heat insulation component 30 is inserted into the through hole 21, it can partially protrude from the through hole 21, so as to facilitate the disassembly and replacement of the heat insulation component 30 that has oxidized after long-term use.

[0038] like Figures 1 to 3 As shown, the energy-saving thermal insulation cylinder also includes a soft felt assembly 40, which is disposed between the cylinder body 10 and the insulation ring 20.

[0039] Specifically, the soft felt assembly 40 can undergo slight deformation after being compressed, thereby protecting the cylinder 10. The soft felt assembly 40 can adapt to the size of the cylinder 10 and adhere to the outer wall of the cylinder 10. With the addition of the soft felt assembly 40, a denser heat insulation layer can be formed, slowing down the heat loss from the cylinder 10.

[0040] In this embodiment, the soft felt assembly 40 includes multiple soft felt layers, which are arranged sequentially along the radial direction of the cylinder 10.

[0041] Specifically, there are four layers of soft felt, which are layered on the outer periphery of the cylinder 10. Structural adhesive is placed between any two adjacent layers of soft felt, or the multiple layers of soft felt are laminated to ensure the structural thickness and performance of the soft felt assembly 40.

[0042] In this embodiment, the soft felt assembly 40 is provided with a structural adhesive layer on the side facing the cylinder 10 or on the side away from the cylinder 10.

[0043] Specifically, a structural adhesive layer is provided on the side of the soft felt assembly 40 facing the cylinder 10. During installation, the soft felt assembly 40 is bonded to the outer wall of the cylinder 10 and then the heat insulation ring 20 is fitted on. This achieves solid-to-solid heat transfer between the soft felt assembly 40 and the cylinder 10, and solid-to-gas heat transfer between the soft felt assembly 40 and the heat insulation component 30. Both heat transfer methods simultaneously provide thermal insulation. The structural adhesive layer not only enhances the bonding strength between the soft felt assembly 40 and the cylinder 10 or the heat insulation ring 20, but also improves the overall structural stability of the insulation cylinder.

[0044] In this embodiment, the protective layer 23 is an alumina fiber layer.

[0045] Specifically, the grid layer 22 is also an alumina fiber layer. When alumina fibers are made into fiberboard, fiber felt, or ring-shaped insulation rings 20, gaps or pores exist between the fiber layers. These gaps or pores allow heat to be transferred from one fiber layer to another through the air between adjacent fiber layers. Air is a good thermal insulator with low thermal conductivity, thus providing insulation to a certain extent. Furthermore, using alumina fibers to make the insulation ring 20 effectively reduces its mass, and alumina fibers have high oxidation resistance. Alumina is a high-temperature resistant and chemically stable material that can form a stable oxide layer at high temperatures, preventing further oxidation and corrosion, thereby improving the service life of the insulation ring 20.

[0046] Furthermore, when the grid layer 22 is also made of alumina fiber, the heat of the cylinder 10 needs to pass through the soft felt assembly 40 first and then through the grid layer 22 made of fiber, thereby improving the heat preservation effect of the energy-saving thermal insulation cylinder.

[0047] In this embodiment, the grid layer 22 and the protective layer 23 are integrally formed.

[0048] Specifically, the grid layer 22 and the protective layer 23 are integrally formed from the same material, which facilitates processing. Alternatively, the grid layer 22 and the protective layer 23 can be processed separately and then nested together.

[0049] like Figure 2 As shown, the top of the grid layer 22 is provided with multiple deformation holes 221. When the grid layer 22 is also made of alumina fiber or other softer materials, and the outer layer of the cylinder 10 is provided with a large number of soft felt components 40, the deformation holes 221 on the grid layer 22 can deform after being squeezed, so that the thickness of the grid layer 22 becomes smaller and thus adapts to the provision of thicker soft felt components 40.

[0050] In this embodiment, both the heat insulation element 30 and the through hole 21 have hexagonal cross-sections.

[0051] Specifically, when the through-hole 21 is hexagonal, the stable structure of the hexagon allows the inner walls of two adjacent through-holes 21 to support each other, effectively dispersing and bearing external pressure, thereby improving the stability and structural strength of the entire honeycomb structure. At the same time, the regular geometric shape of the hexagonal insulation component 30 facilitates efficient production methods such as mold forming, reducing production processes and costs.

[0052] Furthermore, the heat insulation component 30 is a hexagonal ceramic heat insulation tile. Even with a heat insulation cavity, the soft felt component 40 is prone to oxidation and powdering due to heat after long-term use. Even if oxidation occurs, the heat insulation component 30 will be the first to oxidize. The cost of the heat insulation tile is lower, so each replacement only requires replacing the heat insulation tile. Moreover, the heat insulation tiles will not be replaced all at once; only the oxidized heat insulation tiles need to be replaced, thereby reducing maintenance costs.

[0053] This invention also provides a single crystal furnace. The single crystal furnace includes the aforementioned energy-saving thermal insulation cylinder and heater. The heater is located at the bottom of the cylinder 10.

[0054] Specifically, the temperature of the cylinder 10 needs to be maintained during the use of the single crystal furnace. If the temperature of the cylinder 10 drops too quickly, the heater needs to be operated repeatedly, resulting in high costs. Furthermore, rapid temperature changes in the cylinder 10 are not conducive to the preparation of single crystal silicon. The technical solution of this invention can reduce the rate of heat loss from the cylinder 10, thereby avoiding repeated heating by the heater. This design effectively reduces heat exchange inside and outside the hot zone of the single crystal furnace, improving the thermal efficiency of the insulation cylinder. In practical applications, this design can significantly reduce energy consumption, improve thermal energy utilization, and significantly enhance the purity and uniformity of materials, thereby improving finished product quality and production efficiency.

[0055] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: By setting an energy-saving thermal insulation cylinder including a cylinder body 10, a heat insulation ring 20, and heat insulation components 30, the heat insulation ring 20 is sleeved on the outside of the cylinder body 10, and multiple through holes 21 communicating between the inner and outer ring surfaces of the heat insulation ring 20 are opened on the ring wall of the heat insulation ring 20. There are multiple heat insulation components 30, and at least a portion of each heat insulation component 30 is accommodated in the corresponding through hole 21. The heat insulation component 30 is used to block the opening of the through hole 21 near the outer ring surface of the heat insulation ring 20, so that the inner wall of the heat insulation component 30 is flush with the outer wall of the cylinder body 10. A heat insulation cavity is formed by fitting a heat insulation ring 20 with multiple through holes 21 onto the outside of the cylinder 10. The multiple through holes 21 are formed on the heat insulation ring 20, so that the surface of the entire heat insulation ring 20 forms a honeycomb structure. The heat on the cylinder 10 needs to pass through the through holes 21 to be conducted to the heat insulation component 30. The air in the through holes 21 has poor heat transfer effect, thus improving the heat preservation effect. At the same time, the way in which multiple heat insulation components 30 are housed in the through holes 21 can replace only the oxidized heat insulation component 30 after some heat insulation components 30 are heated and oxidized, avoiding the need to replace all heat insulation components 30, thereby reducing maintenance costs.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] It should be noted that the terms "upper" and "lower," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0058] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An energy-saving thermal insulation cylinder, characterized in that, include: Cylinder (10); A heat insulation ring (20) is sleeved on the outside of the cylinder (10). The ring wall of the heat insulation ring (20) has multiple through holes (21) that connect the inner and outer ring surfaces of the heat insulation ring (20). A heat insulation element (30) is provided, wherein there are multiple heat insulation elements (30), and at least a portion of each heat insulation element (30) is accommodated in the corresponding through hole (21). The heat insulation element (30) is used to block the opening of the through hole (21) near the outer ring surface of the heat insulation ring (20) so that a heat insulation cavity is formed between the inner wall of the heat insulation element (30) and the outer wall of the cylinder (10).

2. The energy-saving thermal insulation cylinder according to claim 1, characterized in that, The heat insulation ring (20) includes a grid layer (22) and a protective layer (23) nested in sequence, and the protective layer (23) is fitted onto the outer periphery of the grid layer (22). The through hole (21) penetrates the grid layer (22) and the protective layer (23), and a plurality of the through holes (21) are arranged in an array on the grid layer (22) and the protective layer (23).

3. The energy-saving thermal insulation cylinder according to claim 1, characterized in that, The shape of each heat insulation element (30) is adapted to the shape of the corresponding through hole (21).

4. The energy-saving thermal insulation cylinder according to claim 1, characterized in that, The energy-saving thermal insulation cylinder also includes a soft felt assembly (40), which is disposed between the cylinder body (10) and the heat insulation ring (20).

5. The energy-saving thermal insulation cylinder according to claim 4, characterized in that, The soft felt assembly (40) includes multiple soft felt layers arranged sequentially along the radial direction of the cylinder (10).

6. The energy-saving thermal insulation cylinder according to claim 4, characterized in that, The soft felt assembly (40) has a structural adhesive layer on the side facing the cylinder (10) or on the side away from the cylinder (10).

7. The energy-saving thermal insulation cylinder according to claim 2, characterized in that, The protective layer (23) is an alumina fiber layer.

8. The energy-saving thermal insulation cylinder according to claim 2, characterized in that, The grid layer (22) and the protective layer (23) are integrally formed.

9. The energy-saving thermal insulation cylinder according to any one of claims 1 to 8, characterized in that, Both the heat insulation element (30) and the through hole (21) have hexagonal cross sections.

10. A single crystal furnace, characterized in that, include: Energy-saving thermal insulation cylinder as described in any one of claims 1 to 9; A heater is disposed at the bottom of the cylinder (10).

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