Thermal insulation cylinder and crystal growing furnace
The insulation cylinder formed by splicing multiple flat plates solves the problem of high maintenance costs in the prior art, realizes the convenience of disassembly and repairs, and improves the insulation performance and strength through the multi-layer structure.
Patent Information
- Application Number
- CN202420456655.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-11
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-11
AI Technical Summary
The overall structure of the existing insulation cylinder leads to high maintenance costs and inconvenient disassembly and repair.
The insulation cylinder formed by splicing multiple flat plates is adopted, and the angle between adjacent flat plates is 120~180 degrees. It is surrounded by welding, bonding, clamping and other connections to form a circular-like layer, which is convenient for disassembly and maintenance.
It reduces the maintenance cost of insulation cylinders, improves the convenience of disassembly and repairs, and enhances insulation performance and strength through multi-layer structures.
Smart Images
Figure CN222160462U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of crystal growth, in particular to a heat preservation cylinder and a crystal growth furnace. Background Art
[0002] As one of the core thermal field components of a crystal growth furnace, such as a polycrystalline silicon ingot furnace or a vertical pulling single crystal furnace, the existing insulation cylinder is mainly an integral structure, mostly formed by carbon felt wrapped graphite or carbon-carbon insulation cylinder. In this case, once the insulation component is damaged, it needs to be replaced as a whole, and the maintenance cost is expensive.
[0003] Therefore, a new insulation cylinder is in urgent need of. Utility Model Content
[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a heat preservation tube and a crystal growth furnace.
[0005] The first aspect of the utility model discloses a heat preservation cylinder, comprising: at least one circular or quasi-circular layer formed by a plurality of flat plates, wherein the angle θ between adjacent flat plates is 120-180 degrees.
[0006] Thus, the heat preservation tube is formed by splicing a plurality of flat plates, which is not only convenient for disassembly but also for maintenance, thus greatly reducing the maintenance cost of the heat preservation tube.
[0007] In an optional manner, the flat plate includes an upper surface, a lower surface, a side surface and a cross section, and the cross section is a trapezoidal structure; the side surface of the flat plate is at least partially attached to the side surface of the adjacent flat plate and connected end to end to form the circular layer.
[0008] In an optional manner, the flat plate includes an upper surface, a lower surface, a side surface and a cross section, and the cross section is a trapezoidal structure; the lower surface of the flat plate and the side surface of the adjacent flat plate are at least partially attached end to end to form the circular layer.
[0009] In an optional manner, the plate includes: a first plate; the first plate includes a first upper surface, a first lower surface, a first side surface, a second side surface and a cross section; the cross section is a trapezoidal structure; a second plate; the second plate includes a second upper surface, a second lower surface, a third side surface, a fourth side surface and a cross section; the cross section is an inverted trapezoidal structure; the first side surface of the first plate is at least partially fitted with the fourth side surface of the second plate; the second side surface of the first plate is at least partially fitted with the third side surface of the second plate; so that the first plate is connected to the second plate in the first position to form the circular-like layer.
[0010] In an optional manner, the plate includes: a third plate; the third plate includes a third upper surface, a third lower surface, a fifth side surface, a sixth side surface and a cross section; the cross section is a trapezoidal structure; a fourth plate; the fourth plate includes a fourth upper surface, a fourth lower surface, a seventh side surface, an eighth side surface and a cross section; the cross section is a trapezoidal structure; one end of the third lower surface of the third plate is partially fitted with the seventh side surface of the fourth plate; the other end of the fourth lower surface of the third plate is partially fitted with the eighth side surface of the fourth plate; so that the third plate is connected to the fourth plate at the first position to form the circular-like layer.
[0011] In an optional manner, the cross section of the first plate is a symmetrical trapezoidal structure; the cross section of the second plate is a symmetrical inverted trapezoidal structure; and the acute angle of the first plate is greater than the acute angle of the second plate.
[0012] In an optional manner, the cross section of the third plate is a symmetrical trapezoidal structure; the cross section of the fourth plate is a symmetrical trapezoidal structure; and the acute angle of the third plate is equal to the acute angle of the fourth plate.
[0013] In an optional manner, the heat-insulating cylinder includes two layers: an inner layer and an outer layer, wherein the inner layer is a first-type circular layer; and the outer layer is a second-type circular layer.
[0014] In an optional manner, the side surface of the first plate and the side surface of the second plate are completely fitted and connected end to end to form the first type of circular layer; the lower surface of the third plate and the side surface of the fourth plate are partially fitted and connected end to end to form the second type of circular layer.
[0015] In an optional manner, the third flat plate is bonded to the first flat plate, and the second flat plate is bonded to the fourth flat plate.
[0016] In an optional manner, the upper surface of the first flat plate has a bonding surface that is bonded to the lower surface of the fourth flat plate.
[0017] In an optional manner, the width of the third flat plate in the radial direction of the axis of the insulation cylinder is greater than the width of the lower surface of the first flat plate; the width of the second flat plate in the radial direction of the axis of the insulation cylinder is equal to the width of the lower surface of the fourth flat plate.
[0018] In an optional manner, the difference in acute angles between the first plate and the second plate is equal to the acute angles between the third plate and the fourth plate.
[0019] In an optional manner, the first type circular layer and the second type circular layer are provided with partially penetrating through holes.
[0020] In an optional manner, the material of the plate is graphite or carbon-carbon.
[0021] In an optional manner, the circular-like layer is composed of at least 12 flat plates.
[0022] The second aspect of the utility model discloses a crystal growth furnace, comprising a heat preservation tube disclosed in the first aspect of the utility model,
[0023] Compared with the prior art, the utility model has the following beneficial effects:
[0024] (1) The insulation tube is formed by splicing flat plates, which is easy to disassemble and maintain, greatly reducing the maintenance cost of the insulation tube.
[0025] (2) The circular heat preservation tube is used in the ingot casting furnace to increase the accommodation space of the ingot casting furnace, effectively increase the production capacity of the ingot casting furnace, and reduce the cost of ingot casting.
[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0028] Figure 1 A three-dimensional schematic diagram of an embodiment of the heat preservation cylinder provided by the utility model;
[0029] Figure 2 for Figure 1 A schematic top view of the heat preservation cylinder shown;
[0030] Figure 3 for Figure 2 Schematic diagram of the AA direction;
[0031] Figure 4 for Figure 2 Schematic diagram of the middle BB direction;
[0032] Figure 5 for Figure 1 A partial enlarged schematic diagram of the middle A area;
[0033] Figure 6 for Figure 5 Schematic diagram of the first type of circular layer.
[0034] Figure 7 for Figure 5 Schematic diagram of the second type of circular layer.
[0035] Reference numerals:
[0036] 10-plate; 100-first type circular layer; 110-first plate; 111-first upper surface; 112-first lower surface; 113-first side surface; 114-second side surface; 115-fitting surface; 120-second plate; 121-second upper surface; 122-second lower surface; 123-third side surface; 124-fourth side surface; 200-second type circular layer; 210-third plate; 211-third upper surface; 212-third lower surface; 213-fifth side surface; 214-sixth side surface; 220-fourth plate; 221-fourth upper surface; 222-fourth lower surface; 223-seventh side surface; 224-eighth side surface; 20-through hole; DETAILED DESCRIPTION
[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0038] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.
[0039] Below, refer to the attached Figure 1-2, describes a heat preservation cylinder disclosed according to the first aspect of the utility model. As can be seen from the figure, the heat preservation cylinder includes at least one circular or quasi-circular layer formed by the flat plates 10; wherein the flat plates 10 are plate-shaped objects with two surfaces parallel to each other and being planes; the quasi-circular layer means that the heat preservation cylinder formed is close to a circle, for example, it can be a polygonal layer with more than twelve sides; the heat preservation cylinder is formed by enclosing a plurality of flat plates 10, and the angle θ between adjacent flat plates is 120-180 degrees, for example, it can be It is 120 degrees, 125 degrees, 130 degrees, 135 degrees, 140 degrees, 145 degrees, 150 degrees, 155 degrees, 156 degrees, 157 degrees, 158 degrees, 159 degrees, 160 degrees, 161 degrees, 162 degrees, 163 degrees, 164 degrees, 165 degrees, 166 degrees, 167 degrees, 168 degrees, 169 degrees, 170 degrees, 171 degrees, 172 degrees, 174 degrees, 175 degrees, 176 degrees, 177 degrees, 178 degrees or 179 degrees.
[0040] The flat plates 10 are connected to each other by welding, bonding, clamping, convex-concave grooves, bolt assemblies, etc., which are not limited in the present invention.
[0041] In the utility model, a heat preservation cylinder with a quasi-circular layer is formed by splicing a plurality of flat plates, which is convenient to disassemble and maintain, thereby reducing the maintenance cost of the heat preservation cylinder.
[0042] In an optional embodiment, the circular or quasi-circular layer is composed of at least 12 flat plates; for example, it can be 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, etc.
[0043] In an optional manner, the plate 10 includes an upper surface, a lower surface, a side surface and a cross section, and the cross section is a trapezoidal structure; the plate 10 forms a quasi-circular layer by at least partial adhesion between the side surfaces or partial adhesion between the lower surface and the side surfaces.
[0044] In a specific embodiment, Figure 5-6 As shown, the first plate 110 includes a first upper surface 111, a first lower surface 112, a first side surface 113, a second side surface 114 and a cross section; the cross section of the first plate 110 is a trapezoidal structure; the second plate 120 includes a second upper surface 121, a second lower surface 122, a third side surface 123, a fourth side surface 124 and a cross section; the cross section of the second plate 120 is a trapezoidal structure; the first side surface 113 of the first plate 110 and the fourth side surface 124 of the second plate 120 are completely fitted or partially fitted, connected end to end, alternately spliced and enclosed to form a quasi-circular layer. Thus, a heat preservation tube can be formed by simple assembly.
[0045] Furthermore, in a more specific embodiment, the cross section of the first plate 110 is a symmetrical inverted trapezoidal structure; the acute angle of the first plate 110 is greater than the acute angle of the second plate 120. This allows the shape of the heat preservation tube to be closer to a circle. The difference between the angles of the first plate 110 and the second plate 120 can further control the angle between the plates 10 and 10 in the quasi-circular layer. In this specific embodiment, by controlling the acute angle of the first plate 110 to be greater than the acute angle of the second plate 120, the heat preservation tube is closer to a circular heat preservation tube.
[0046] It is worth noting that the cross-section of the flat plate in the present invention is a trapezoidal or inverted trapezoidal structure, and the acute angle of the flat plate refers to the acute angle formed by the upper surface or the lower surface of the flat plate and the side surface; for example, the first flat plate 110 is an inverted trapezoidal structure, and its acute angle is the acute angle formed by the first upper surface 111 and the first side surface 113 or the second side surface 114; the second flat plate 120 is a trapezoidal structure, and its acute angle is the acute angle formed by the second lower surface 122 and the third side surface 123 or the fourth side surface 124.
[0047] In a specific embodiment, Figure 5 and 7 As shown, the third plate 210 includes a third upper surface 211, a third lower surface 212, a fifth side 213, a sixth side 214 and a cross section; the cross section of the third plate 210 is a trapezoidal structure; the fourth plate 220; the fourth plate 220 includes a fourth upper surface 221, a fourth lower surface 22, a seventh side 223, an eighth side 224 and a cross section; the cross section of the fourth plate 220 is a trapezoidal structure; one end of the third lower surface 212 of the third plate 210 is partially fitted with the seventh side 223 of the fourth plate 220; the other end of the fourth lower surface 22 of the third plate 210 is partially fitted with the eighth side 224 of the fourth plate 220; so that the third plate 210 and the fourth plate 220 are connected end to end to form a quasi-circular layer. Thus, the heat preservation cylinder can be formed by simple assembly.
[0048] Furthermore, in a more specific embodiment, the cross-section of the third plate 210 is a symmetrical trapezoidal structure; the cross-section of the fourth plate 220 is a symmetrical trapezoidal structure; the acute angle of the third plate 210 is equal to the acute angle of the fourth plate 220; thus, by controlling the angle between the third plate 210 and the fourth plate 220, the shape of the insulation tube is more uniform and closer to a circular insulation tube.
[0049] It is worth noting that the cross-section of the flat plate in the present invention is a trapezoidal or inverted trapezoidal structure, and the acute angle of the flat plate refers to the acute angle formed by the upper surface or the lower surface of the flat plate and the side surface; for example, the third flat plate 210 is an inverted trapezoidal structure, and its acute angle is the acute angle formed by the third upper surface 211 and the fifth side surface 213 or the sixth side surface 214; the fourth flat plate 220 is a trapezoidal structure, and its acute angle is the acute angle formed by the fourth upper surface 221 and the seventh side surface 223 or the eighth side surface 224.
[0050] It is worth noting that in the present invention, "equal angles" does not mean exactly the same. Errors between + / - 2 degrees caused by processing errors, etc. fall within the scope of equal angles in the present invention.
[0051] In an optional manner, the insulation tube includes two layers, an inner layer and an outer layer, wherein the inner layer is a first circular layer 100 and the outer layer is a second circular layer 200. The insulation tube with a multi-layer structure not only improves the insulation performance of the insulation tube, but also makes the strength of the spliced insulation tube higher.
[0052] In a specific embodiment, Figure 1-5 As shown, the first circular layer 100 of the heat preservation cylinder is formed by the first flat plate 110 and the second flat plate 120 , and the second circular layer 200 is formed by the third flat plate 210 and the fourth flat plate 220 .
[0053] Specifically, in the first type circular layer 100, the first plate 110 includes a first upper surface 111, a first lower surface 112, a first side surface, a second side surface 114 and a cross section; the cross section of the first plate 110 is an inverted trapezoidal structure; the second plate 120 includes a second upper surface 121, a second lower surface 122, a third side surface 123, a fourth side surface 124 and a cross section; the cross section of the second plate 120 is an inverted trapezoidal structure; the first side surface of the first plate 110 and the fourth side surface 124 of the second plate 120 are completely or partially attached to each other, connected end to end and alternately spliced to enclose the first type circular layer 100. In the second type circular layer 200, the third plate 210 includes a third upper surface 211, a third lower surface 212, a fifth side surface 213, a sixth side surface 214 and a cross section; the cross section is a trapezoidal structure; the fourth plate 220; the fourth plate 220 includes a fourth upper surface 221, a fourth lower surface 22, a seventh side surface 223, an eighth side surface 224 and a cross section; the cross section is a trapezoidal structure; one end of the third lower surface 212 of the third plate 210 is partially fitted with the seventh side surface 223 of the fourth plate 220; the other end of the fourth lower surface 22 of the third plate 210 is partially fitted with the eighth side surface 224 of the fourth plate 220; so that the third plate 210 and the fourth plate 220 are connected end to end to form the second type circular layer 200.
[0054] Furthermore, in a specific embodiment, during the assembly of the inner layer and the outer layer, the third plate 210 is bonded to the first plate 110, and the second plate 120 is bonded to the fourth plate 220. This allows the inner layer and the outer layer to be more closely joined, the insulation tube to be more airtight, and the insulation performance to be better.
[0055] Preferably, the upper surface of the first flat plate 110 has a fitting surface 115 that fits with the lower surface of the fourth flat plate 220. This can further improve the heat preservation performance of the heat preservation cylinder.
[0056] Preferably, the width of the third flat plate 210 in the radial direction of the axis of the heat preservation tube is greater than the width of the lower surface of the first flat plate 110; the width of the second flat plate 120 in the radial direction of the axis of the heat preservation tube is equal to the width of the lower surface of the fourth flat plate 220. This can further improve the heat preservation performance of the heat preservation tube. It is worth noting that in the present invention, the "equal width" does not need to be exactly the same in a strict sense. The error between + / -1 cm caused by processing errors, etc., falls within the scope of equal width of the present invention.
[0057] Preferably, the acute angle difference between the first plate 110 and the second plate 120 is equal to the acute angle between the third plate 210 and the fourth plate 220. This allows the inner layer and the outer layer to fit more closely, improves the thermal insulation performance, and increases the strength of the thermal insulation tube.
[0058] In a specific embodiment, the first circular layer 100 and the second circular layer 200 are provided with through holes 20, and the through holes 20 can be used to set fasteners such as pins and bolts, thereby further improving the strength of the insulation tube and making the insulation tube more tightly combined.
[0059] In an optional manner, the material of the plate 10 is graphite or carbon-carbon.
[0060] The second aspect of the utility model discloses a crystal growth furnace, which may be, for example, an ingot casting furnace for directional solidification growth or a single crystal furnace for Czochralski growth.
[0061] The heat preservation tube provided by the utility model is adopted in a crystal growth furnace, which is convenient for disassembly and maintenance, and greatly reduces the maintenance cost of the heat preservation tube.
[0062] In addition, the use of this type of circular insulation tube in the ingot casting furnace can increase the accommodating space of the ingot casting furnace, effectively increase the production capacity of the ingot casting furnace, and reduce the cost of ingot casting.
[0063] The heat preservation cylinder disclosed in the first aspect of the present utility model is described in detail below with several specific embodiments. It is worth noting that the following description is only an exemplary description and not a specific limitation of the invention. Example
[0064] refer to Figure 1-7 The heat preservation tube includes a first circular layer 100 , which is composed of 9 first flat plates 110 and 9 second flat plates 120 ; and a second circular layer 200 , which is composed of 9 third flat plates 210 and 9 fourth flat plates 220 .
[0065] Among them, the first plate 110 includes a first upper surface 111, a first lower surface 112, a first side surface 113, a second side surface 114 and a cross section; the cross section of the first plate 110 is an inverted trapezoidal structure; the acute angle of the first plate 110 is 65 degrees, and the second plate 120 includes a second upper surface 121, a second lower surface 122, a third side surface 123, a fourth side surface 124 and a cross section; the cross section of the second plate 120 is a trapezoidal structure, and the acute angle of the second plate 120 is 45 degrees; the first side surface 113 of the first plate 110 and the fourth side surface 124 of the second plate 120 are completely fitted together, connected end to end and alternately spliced to form a first type circular layer 100 with an angle θ of 160 degrees.
[0066] The third plate 210 includes a third upper surface 211, a third lower surface 212, a fifth side surface 213, a sixth side surface 214 and a cross section; the cross section is a trapezoidal structure; the acute angle of the third plate 210 is 20 degrees; the fourth plate 220; the fourth plate 220 includes a fourth upper surface 221, a fourth lower surface 22, a seventh side surface 223, an eighth side surface 224 and a cross section; the cross section is a trapezoidal structure; one end of the third lower surface 212 of the third plate 210 is partially fitted with the seventh side surface 223 of the fourth plate 220; the other end of the fourth lower surface 22 of the third plate 210 is partially fitted with the eighth side surface 224 of the fourth plate 220; so that the third plate 210 and the fourth plate 220 are connected end to end to form a second type circular layer 200 with an angle θ of 160 degrees.
[0067] The width of the third plate 210 in the radial direction of the axis of the heat preservation cylinder is greater than the width of the lower surface of the first plate 110 ; the width of the second plate 120 in the radial direction of the axis of the heat preservation cylinder is equal to the width of the lower surface of the fourth plate 220 .
[0068] The first type circular layer 100 and the second type circular layer 200 are provided with through holes 20. The through holes 20 are provided with connecting members, which are pins.
[0069] The material of the plate 10 is graphite. Example
[0070] The difference from the first embodiment is that a bonding surface 115 is formed on the upper surface of the first plate 10 to be bonded to the lower surface of the fourth plate 10 . Example
[0071] The difference from the first embodiment is that the material of the plate 10 is carbon-carbon. Example
[0072] The difference from the first embodiment is that the first type circular layer 100 is composed of 10 first flat plates 10 and 10 second flat plates 10, and the second type circular layer 200 is composed of 10 third flat plates 10 and 10 fourth flat plates 10. The angle θ in the first type circular layer is 162 degrees. The acute angle of the first flat plate 10 is 64 degrees, the acute angle of the second flat plate 10 is 46 degrees; the acute angle of the third flat plate 10 is 18 degrees; the acute angle of the fourth flat plate 10 is 18 degrees. The angle θ in the second type circular layer is 162 degrees. Example
[0073] The difference from the first embodiment is that the first type circular layer 100 is composed of 12 first flat plates 10 and 12 second flat plates 10, and the second type circular layer 200 is composed of 10 third flat plates 10 and 10 fourth flat plates 10. The angle θ in the first type circular layer is 165 degrees. The acute angle of the first flat plate 10 is 62.5 degrees, and the acute angle of the second flat plate 10 is 47.5 degrees; the acute angle of the third flat plate 10 is 15 degrees; the acute angle of the fourth flat plate 10 is 15 degrees. The angle θ in the second type circular layer is 165 degrees.
[0074] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.
[0075] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0077] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A heat preservation cylinder, characterized in that: include: At least one circular or quasi-circular layer is formed by enclosing a plurality of flat plates, and the angle θ between adjacent flat plates is 120-180 degrees.
2. The heat preservation cylinder according to claim 1, characterized in that: The flat plate comprises an upper surface, a lower surface, a side surface and a cross section, and the cross section is a trapezoidal structure; The side surface of the flat plate is at least partially attached to the side surface of the adjacent flat plate and connected end to end to form the circular layer; and / or; the lower surface of the flat plate is at least partially attached to the side surface of the adjacent flat plate and connected end to end to form the circular layer.
3. The heat preservation cylinder according to claim 2, characterized in that: The plate comprises: A first plate; the first plate comprises a first upper surface, a first lower surface, a first side surface, a second side surface and a cross section; the cross section is a trapezoidal structure; A second plate; the second plate comprises a second upper surface, a second lower surface, a third side surface, a fourth side surface and a cross section; the cross section is an inverted trapezoidal structure; The first side surface of the first plate is at least partially attached to the fourth side surface of the second plate; the second side surface of the first plate is at least partially attached to the third side surface of the second plate; so that the first plate and the second plate are connected to form the circular layer; and / or; The plate comprises: A third plate; the third plate comprises a third upper surface, a third lower surface, a fifth side surface, a sixth side surface and a cross section; the cross section is a trapezoidal structure; A fourth plate; the fourth plate comprises a fourth upper surface, a fourth lower surface, a seventh side surface, an eighth side surface and a cross section; the cross section is a trapezoidal structure; One end of the third lower surface of the third plate is partially fitted with the seventh side surface of the fourth plate; the other end of the fourth lower surface of the third plate is partially fitted with the eighth side surface of the fourth plate; so that the third plate and the fourth plate are connected at the first position to form the circular layer.
4. The heat preservation cylinder according to claim 3, characterized in that: The cross section of the first plate is a symmetrical trapezoidal structure; the cross section of the second plate is a symmetrical inverted trapezoidal structure; the acute angle of the first plate is greater than the acute angle of the second plate; and / or; The cross section of the third plate is a symmetrical trapezoidal structure; the cross section of the fourth plate is a symmetrical trapezoidal structure; the acute angle of the third plate is equal to the acute angle of the fourth plate; and / or; The heat preservation tube comprises two layers: an inner layer and an outer layer, wherein the inner layer is a first type circular layer; and the outer layer is a second type circular layer.
5. The heat preservation cylinder according to claim 4, characterized in that: The side surface of the first plate is completely attached to the side surface of the second plate and connected end to end to form the first type of circular layer; the lower surface of the third plate is partially attached to the side surface of the fourth plate and connected end to end to form the second type of circular layer.
6. The heat preservation cylinder according to claim 5, characterized in that: The third flat plate is attached to the first flat plate, and the second flat plate is attached to the fourth flat plate.
7. The heat preservation cylinder according to claim 6, characterized in that: The upper surface of the first flat plate has a bonding surface that is bonded to the lower surface of the fourth flat plate; and / or, The width of the third flat plate in the radial direction of the axis of the heat preservation tube is greater than the width of the lower surface of the first flat plate; the width of the second flat plate in the radial direction of the axis of the heat preservation tube is equal to the width of the lower surface of the fourth flat plate; and / or, The difference in acute angles between the first plate and the second plate is equal to the acute angles between the third plate and the fourth plate.
8. The heat preservation cylinder according to claim 4, characterized in that: The first type circular layer and the second type circular layer are provided with through holes which at least partially penetrate through.
9. The heat preservation cylinder according to claim 1, characterized in that: The material of the flat plate is graphite or carbon-carbon; and / or the circular-like layer is composed of at least 12 flat plates.
10. A crystal growth furnace, characterized in that: The invention comprises the heat preservation cylinder as described in any one of claims 1 to 9.