Thermal field for single crystal furnace and single crystal furnace

Abstract

The utility model relates to a thermal field for a single crystal furnace and the single crystal furnace. The thermal field comprises a heater; the heat preservation device comprises a heat preservation ring and a fixing ring, the heat preservation ring is made of an insulating high-temperature-resistant material, the heater is sleeved with the heat preservation ring, at least part of the inner side of the heat preservation ring abuts against the outer side of the heater, the heat preservation ring comprises a plurality of heat preservation unit bodies, and the heat preservation unit bodies are spliced in the circumferential direction; the fixing rings are arranged on the outer sides of the heat preservation rings in a sleeving mode so as to lock and fix the multiple heat preservation unit bodies. The multiple heat preservation unit bodies can be spliced into the heat preservation ring, and at least part of the inner side of the heat preservation ring can abut against the outer side of the heater, so that the gap between the heat preservation ring and the heater is reduced or even eliminated, and then the heat preservation effect of the heat preservation ring is guaranteed; meanwhile, the heat preservation ring is made of an insulating high-temperature-resistant material, so that ignition between the heat preservation ring and the heater can be avoided, and potential safety hazards are further reduced.

Description

Technical Field

[0001] The present application relates to the field of thermal field technology, and in particular to a thermal field and a single crystal furnace for a single crystal furnace. Background Art

[0002] The thermal field of a single crystal furnace includes a heater and an insulation tube. The insulation tube is sleeved outside the heater and insulates the heater to reduce the heat loss of the heater and help the heater maintain a constant temperature. In the prior art, the heater is usually a graphite part, and the insulation tube includes a graphite part and carbon felt. In order to ensure the insulation effect of the insulation tube on the heater, the gap between the insulation tube and the heater should be small. However, when the gap between the insulation tube and the heater is insufficient, the insulation tube is prone to ignite with the heater due to power on, posing a safety hazard. Utility Model Content

[0003] Based on this, the present application provides a thermal field and a single crystal furnace for a single crystal furnace, so as to improve the problem in the prior art that insufficient gap between the heat preservation device and the heater easily causes sparks and poses a safety hazard.

[0004] In a first aspect, the present application provides a thermal field for a single crystal furnace, the thermal field comprising:

[0005] Heater;

[0006] The heat preservation device comprises a heat preservation ring and a fixed ring. The heat preservation ring is made of an insulating and high-temperature resistant material. The heat preservation ring is sleeved on the outside of the heater, and the inner side of the heat preservation ring at least partially abuts against the outer side of the heater. The heat preservation ring comprises a plurality of heat preservation units, and the plurality of heat preservation units are spliced ​​along the circumferential direction. The fixed ring is sleeved on the outer side of the heat preservation ring to lock and fix the plurality of heat preservation units.

[0007] In one embodiment, the thermal expansion coefficient of the insulation ring is not less than the thermal expansion coefficient of the heater.

[0008] In one embodiment, the insulation ring is made of zirconium oxide, zirconium carbide, titanium carbide, niobium carbide, hafnium carbide or tantalum carbide.

[0009] In one of the embodiments, the fixing ring is made of carbon-carbon material.

[0010] In one of the embodiments, the heat-insulating unit body is provided with a protrusion and a recess on both sides of the heat-insulating ring in the circumferential direction, and two circumferentially adjacent heat-insulating unit bodies are spliced ​​by a group of the protrusions and the recesses that cooperate with each other.

[0011] In one embodiment, the cross-sections of the protruding portion and the recessed portion are both configured to be in a "V" shape.

[0012] In one embodiment, the cross-sections of the protrusion and the depression are both configured to be wavy.

[0013] In one of the embodiments, the cross section of the heat preservation unit body is set to be a "V" shape, and two sides of the "V" shape of the heat preservation unit body abut against the outer side of the heater.

[0014] In one embodiment, the cross section of the heat preservation unit body is configured to be arc-shaped, and the inner side of the heat preservation unit body abuts against the outer side of the heater.

[0015] In a second aspect, the present application provides a single crystal furnace, which includes any one of the thermal fields for a single crystal furnace provided in the present application.

[0016] The present application locks and fixes several insulation units on the heater through a fixing ring, and the several insulation units can be spliced ​​into an insulation ring, and the inner side of the insulation ring can at least partially abut against the outer side of the heater. Therefore, the present application reduces or even eliminates the gap between the insulation ring and the heater, thereby ensuring the insulation effect of the insulation ring; at the same time, since the insulation ring in the present application is made of insulating and high-temperature resistant material, the present application can also avoid sparks between the insulation ring and the heater, thereby reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of the thermal field for a single crystal furnace provided in Example 1 of the present application;

[0018] Figure 2 A schematic structural diagram of a thermal field for a single crystal furnace provided in Embodiment 1 of the present application from another perspective;

[0019] Figure 3 A schematic structural diagram of a heat preservation unit for a thermal field of a single crystal furnace provided in the first embodiment of the present application;

[0020] Figure 4 A top view of a heat preservation unit body for a thermal field of a single crystal furnace provided in the first embodiment of the present application abutting against a heater;

[0021] Figure 5 A schematic diagram of the structure of a heat preservation unit for a thermal field of a single crystal furnace provided in the second embodiment of the present application;

[0022] Figure 6 This is a schematic structural diagram of the heat preservation unit for the thermal field of a single crystal furnace provided in Example 3 of the present application.

[0023] Reference numerals: 100, heater; 110, heater body; 120, heater leg; 200, insulation ring; 210, insulation unit; 211, raised portion; 212, recessed portion; 300, fixing ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0026] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0027] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] Embodiment 1

[0029] Embodiment 1 of the present application provides a thermal field for a single crystal furnace, the thermal field comprising:

[0030] Heater 100;

[0031] The heat preservation device includes a heat preservation ring 200 and a fixed ring 300. The heat preservation ring 200 is made of an insulating and high-temperature resistant material. The heat preservation ring 200 is sleeved on the outside of the heater 100, and the inner side of the heat preservation ring 200 is at least partially in contact with the outer side of the heater 100. The heat preservation ring 200 includes a plurality of heat preservation unit bodies 210, and the plurality of heat preservation unit bodies 210 are spliced ​​along the circumferential direction. The fixed ring 300 is sleeved on the outer side of the heat preservation ring 200 to lock and fix the plurality of heat preservation unit bodies 210.

[0032] like Figure 1and Figure 2 As shown, in this embodiment, the heater 100 can include a heater body 110 and a heater foot 120. The heater body 110 can be used as a functional component of the heater 100, that is, it is mainly used to realize the heating function. The heater body 110 can be set in a ring shape, and the unfolded shape of the side of the heater body 110 can be a continuous "S" shape. The heater foot 120 can be set at the bottom of the heater body 110, and the heater foot 120 is used to energize the heater body 110. The heater foot 120 can be set in an "L" shape, and two heater feet 120 can be symmetrically arranged along the axial section of the heater body 110, and the axial section of the heater body 110 is the section passing through the axis of the heater body 110. The heater foot 120 and the heater 100 body can be an integrated structure; of course, it can also be an assembled structure, for example, the heater foot 120 and the heater 100 body can be detachably connected; this embodiment takes an integrated structure as an example. The heater foot 120 and the heater 100 body can both be made of graphite.

[0033] like Figure 1 and Figure 2 As shown, in this embodiment, the insulation ring 200 is used as a functional component of the insulation device, which can be sleeved outside the heater body 110 to insulate the heater 100 and reduce the heat loss of the heater 100. The insulation ring 200 can be made of an insulating and high-temperature resistant material. The high-temperature resistance of the material can ensure that the insulation ring 200 can play a heat-insulating role in a high-temperature environment; and the insulation of the material can prevent the insulation ring 200 and the heater 100 body from having current conduction, thereby avoiding sparks due to arcing between the insulation ring 200 and the heater 100 body. The inner side of the insulation ring 200 can at least partially abut against the outer side of the heater 100 body to reduce the gap between the insulation ring 200 and the heater 100 body, thereby enhancing the insulation effect of the insulation ring 200 on the heater 100 body.

[0034] Of course, in some embodiments, the insulation ring 200 may be further sleeved outside the heater foot 120 .

[0035] like Figure 1 and Figure 2As shown, in this embodiment, the insulation ring 200 may include a plurality of insulation unit bodies 210, and the plurality of insulation unit bodies 210 may be spliced ​​along the circumference of the insulation ring 200. The arcs of the plurality of insulation unit bodies 210 along the corresponding circumferential direction may be equal or unequal; in other words, the width dimensions of the plurality of insulation unit bodies 210 along the circumferential direction may be equal or unequal; in this embodiment, the equal dimensions of the plurality of insulation unit bodies 210 are taken as an example. After the plurality of insulation unit bodies 210 are spliced ​​into the insulation ring 200, they may be locked and fixed by a fixing ring 300. The fixing ring 300 may be sleeved on the insulation ring 200, and may be sleeved in the middle position of the axial direction of the insulation ring 200. The fixing ring 300 may be set as a circular ring, which may have an interference fit with the insulation ring 200. When a plurality of heat-insulating unit bodies 210 are spliced ​​along the circumferential direction, the fixing rings 300 are sleeved on the plurality of heat-insulating unit bodies 210 , and the plurality of fixing rings 300 can be locked and fixed.

[0036] Of course, in some embodiments, the fixing ring 300 can also be detachably connected to the heater 100 or the insulation ring 200, and when connected, several insulation units 210 are locked and fixed. In other embodiments, the fixing ring 300 can also be a structure similar to a hoop, etc.

[0037] To summarize, the present application locks and fixes several insulation unit bodies 210 on the heater 100 through the fixing ring 300, and several insulation unit bodies 210 can be spliced ​​into an insulation ring 200, and the inner side of the insulation ring 200 can be at least partially abutted against the outer side of the heater 100. Therefore, the present application reduces or even eliminates the gap between the insulation ring 200 and the heater 100, thereby ensuring the insulation effect of the insulation ring 200; at the same time, since the insulation ring 200 in the present application is made of insulating and high-temperature resistant material, the present application can also avoid sparks between the insulation ring 200 and the heater 100, thereby reducing safety hazards.

[0038] It is also understandable that, since the insulation ring 200 is composed of a plurality of insulation units 210, when the insulation ring 200 undergoes thermal expansion, the stress of thermal expansion can be eliminated through the gaps between the insulation units 210, thereby preventing the insulation ring 200 from expanding and cracking due to stress. Even if a certain insulation unit 210 in the insulation ring 200 is cracked or damaged due to expansion and cracking, the insulation unit 210 can be replaced alone to achieve the purpose of cost saving.

[0039] Specifically, the thermal expansion coefficient of the insulation ring 200 is not less than the thermal expansion coefficient of the heater 100 .

[0040] like Figure 1 and Figure 2As shown, in this embodiment, it is exemplified that the higher the thermal expansion coefficient of the material, the higher the volume increment when heated. When the thermal expansion coefficient of the insulation ring 200 is not lower than the thermal expansion coefficient of the heater 100, since the volume increment of the heater 100 is small when heated, the heater 100 will not squeeze the insulation ring 200 when thermal expansion occurs, and the heater 100 will not cause the insulation ring 200 to rupture due to thermal expansion.

[0041] It can be understood that this embodiment can reduce the risk of the insulation ring 200 being cracked by the heater 100 in a high temperature environment by reasonably setting the thermal expansion coefficient of the insulation ring 200, thereby ensuring that the insulation ring 200 can stably and effectively perform its insulation function and extend the service life of the insulation ring 200.

[0042] More specifically, the insulation ring 200 is made of zirconium oxide, zirconium carbide, titanium carbide, niobium carbide, hafnium carbide or tantalum carbide.

[0043] like Figure 1 and Figure 2 As shown, in this embodiment, the heater 100 can be made of graphite, and the thermal expansion coefficient of graphite is 4.5-5.9*10 -6 K -1 The thermal expansion coefficient of zirconium oxide is 9.4*10 -6 K -1 The thermal expansion coefficient of zirconium carbide is about 6.73*10 -6 K -1 The thermal expansion coefficient of titanium carbide is about 7.74*10 -6 K -1 The thermal expansion coefficient of niobium carbide is about 6.65*10 -6 K -1 The thermal expansion coefficient of hafnium carbide is about 6.59*10 -6 K -1 The thermal expansion coefficient of tantalum carbide is about 6.29*10 -6 K -1 About, they can meet the use requirements as the material of the insulation ring 200.

[0044] It can be understood that, in this embodiment, by reasonably setting the material of the insulation ring 200, the thermal expansion coefficient of the insulation ring 200 can be relatively high, thereby preventing the insulation ring 200 from being squeezed by the heater 100 during thermal expansion.

[0045] More specifically, the fixing ring 300 is made of carbon-carbon material.

[0046] like Figure 1 and Figure 2As shown, in this embodiment, the carbon-carbon material, i.e., a carbon / carbon composite material (c-c composite or carbon-carbon composite material), has a thermal expansion coefficient of 0.5-2.0*10 -6 K -1 It is not difficult to see that the thermal expansion coefficient of the carbon-carbon material is smaller than that of the graphite and the material of the heat preservation ring 200. When the fixing ring 300, the heat preservation ring 200 and the heater 100 are heated and expanded in a high temperature environment, the fixing ring 300 is directly squeezed by the heat preservation ring 200. However, since the carbon-carbon material also has good mechanical properties, the fixing ring 300 is not prone to expansion and cracking, and the fixing ring 300 can form a better clavicle fixation for a plurality of heat preservation units 210.

[0047] It is understandable that, in this embodiment, by reasonably setting the material of the fixing ring 300 , the locking and fixing effect of the fixing ring 300 on the plurality of heat preservation units 210 can be enhanced, so as to further improve the structural stability of the heat preservation device.

[0048] Specifically, the heat preservation unit body 210 is provided with a protrusion 211 and a recess 212 on both sides of the heat preservation ring 200 in the circumferential direction, and two heat preservation unit bodies 210 adjacent to each other in the circumferential direction are spliced ​​by a group of protrusions 211 and recesses 212 that cooperate with each other.

[0049] like Figure 1 and Figure 3 As shown, in this embodiment, it is exemplified that the raised portion 211 can be formed by the heat preservation unit body 210 protruding on one side of the heat preservation ring 200; correspondingly, the recessed portion 212 can be formed by the heat preservation unit body 210 being recessed on the other side of the heat preservation ring 200. The raised direction of the raised portion 211 and the recessed direction of the recessed portion 212 can both be in the circumference of the heat preservation ring 200. For example, from the top view of the heat preservation ring 200, the raised direction of the raised portion 211 and the recessed direction of the recessed portion 212 can both be in the counterclockwise direction. The shapes and sizes of the raised portion 211 and the recessed portion 212 can be the same, so that the raised portion 211 and the recessed portion 212 on the side close to each other of two heat preservation unit bodies 210 adjacent to each other in the circumferential direction can cooperate with each other, thereby enabling the adjacent two heat preservation unit bodies 210 to be spliced.

[0050] It can be understood that in this embodiment, a protrusion 211 and a recessed portion 212 are respectively provided on both sides of the circumference of the insulation unit body 210, and two adjacent insulation unit bodies 210 are spliced ​​through the protrusion 211 and the recessed portion 212. The mutual cooperation between the protrusion 211 and the recessed portion 212 can not only enhance the structural stability of the two adjacent insulation unit bodies 210 after splicing; at the same time, the movement of the insulation unit body 210 along its axial direction can be guided and positioned during the splicing process, thereby improving the splicing efficiency.

[0051] More specifically, the cross sections of the protrusion 211 and the depression 212 are both configured to be in a “V” shape.

[0052] like Figure 1 and Figure 3 As shown, in this embodiment, the protrusion 211 and the recessed portion 212 can each include two planes, and the two planes can be arranged at an obtuse angle, and the intersection of the two planes is the tip of the "V" shape. When the protrusion 211 and the recessed portion 212 cooperate with each other, the two planes of the protrusion 211 and the recessed portion 212 correspond to each other and abut against each other.

[0053] It can be understood that, in this embodiment, by reasonably setting the cross-sectional shapes of the protrusion 211 and the recess 212 , the effect of the cooperation between the protrusion 211 and the recess 212 can be ensured.

[0054] Specifically, the cross section of the heat preservation unit 210 is set to be a “V” shape, and both sides of the “V” shape of the heat preservation unit 210 abut against the outer side of the heater 100 .

[0055] like Figure 3 and Figure 4 As shown, in this embodiment, the "V"-shaped opening of the heat preservation unit body 210 can be oriented toward the heater 100, so that the ring structure formed by splicing a plurality of heat preservation unit bodies 210 can be sleeved on the heater 100. After the plurality of heat preservation unit bodies 210 are spliced, the inner side of the heat preservation ring 200 only partially abuts against the outer side of the heater 100, and the abutting position is the splicing of two adjacent heat preservation unit bodies 210, that is, the two sides of the "V" shape of the heat preservation unit body 210.

[0056] It is understandable that since the material density of the insulation ring 200 is relatively high, it is difficult to achieve a large bending. Therefore, this embodiment can reduce the difficulty of preparing the insulation unit 210 by reasonably setting the shape of the cross section of the insulation unit 210.

[0057] The implementation principle of a thermal field for a single crystal furnace provided in the first embodiment of the present application is:

[0058] During preparation, the heater 100, the heat preservation unit body 210 and the fixing ring 300 are first formed separately, and then a plurality of heat preservation unit bodies 210 are pre-fixed on the outer side of the heater 100. When fixing the heat preservation unit body 210, two adjacent heat preservation unit bodies 210 are spliced ​​by the raised portion 211 and the recessed portion 212, so that a plurality of heat preservation unit bodies 210 are spliced ​​into the heat preservation ring 200. Then, the fixing ring 300 is sleeved on the plurality of heat preservation unit bodies 210, so that the plurality of heat preservation unit bodies 210 are locked and fixed by the fixing ring 300.

[0059] The present application locks and fixes several insulation unit bodies 210 on the heater 100 through a fixing ring 300, and several insulation unit bodies 210 can be spliced ​​into an insulation ring 200, and the inner side of the insulation ring 200 can at least partially abut against the outer side of the heater 100. Therefore, the present application reduces or even eliminates the gap between the insulation ring 200 and the heater 100, thereby ensuring the insulation effect of the insulation ring 200; at the same time, since the insulation ring 200 in the present application is made of insulating and high-temperature resistant material, the present application can also avoid sparks between the insulation ring 200 and the heater 100, thereby reducing safety hazards.

[0060] Embodiment 2

[0061] Embodiment 2 of the present application provides a thermal field for a single crystal furnace. The difference between this embodiment and Embodiment 1 is at least in the shapes of the cross sections of the protrusion 211 and the depression 212 .

[0062] Specifically, the cross sections of the protruding portion 211 and the recessed portion 212 are both configured to be wavy.

[0063] like Figure 5 As shown, in this embodiment, the wavy shape can be understood as a curve shape with crests and / or troughs. The raised portion 211 may have only one crest, and the recessed portion 212 may have only one trough. In this case, the cross-sectional shapes of the raised portion 211 and the recessed portion 212 can also be referred to as arcs. Of course, the raised portion 211 can also have at least one continuous crest and at least one trough, and the same is true for the recessed portion 212. When the raised portion 211 and the recessed portion 212 cooperate with each other, the curved surface corresponding to the raised portion 211 abuts against the curved surface corresponding to the recessed portion 212.

[0064] It is understandable that in this embodiment, by providing another shape of the cross section of the protrusion 211 and the recess 212 , the effect of the cooperation between the protrusion 211 and the recess 212 can also be ensured.

[0065] The implementation principle of a thermal field for a single crystal furnace provided in the second embodiment of the present application is basically the same as that in the first embodiment.

[0066] Embodiment 3

[0067] Embodiment 3 of the present application provides a thermal field for a single crystal furnace. The difference between this embodiment and Embodiment 1 is at least in the shape of the cross section of the heat preservation unit body 210 .

[0068] Specifically, the cross section of the heat preservation unit body 210 is configured to be arc-shaped, and the inner side of the heat preservation unit body 210 abuts against the outer side of the heater 100 .

[0069] like Figure 1 and Figure 6 As shown, in this embodiment, the insulation unit 210 can of course be set to an arc shape. In this case, the inner side of the insulation unit 210 can just abut against the outer side of the heater 100, that is, abut against each other to eliminate the gap between the insulation ring 200 and the heater 100.

[0070] It can be understood that in this embodiment, by setting the cross-section of the heat preservation unit 210 to be arc-shaped, the gap between the heat preservation ring 200 and the heater 100 can be eliminated to further ensure the heat preservation effect of the heat preservation ring 200 on the heater 100.

[0071] The implementation principle of a thermal field for a single crystal furnace provided in the third embodiment of the present application is basically the same as that in the first embodiment.

[0072] Embodiment 4

[0073] Embodiment 3 of the present application provides a single crystal furnace, and the single crystal furnace includes any one of the thermal fields for a single crystal furnace provided in the present application.

[0074] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A thermal field for a single crystal furnace, characterized in that: The thermal field comprises: Heater (100); A heat preservation device comprises a heat preservation ring (200) and a fixing ring (300), wherein the heat preservation ring (200) is made of an insulating and high temperature resistant material, the heat preservation ring (200) is sleeved outside the heater (100), and the inner side of the heat preservation ring (200) at least partially abuts against the outer side of the heater (100), the heat preservation ring (200) comprises a plurality of heat preservation unit bodies (210), and the plurality of heat preservation unit bodies (210) are spliced ​​along the circumferential direction, and the fixing ring (300) is sleeved outside the heat preservation ring (200) to lock and fix the plurality of heat preservation unit bodies (210).

2. The thermal field for a single crystal furnace according to claim 1, characterized in that: The thermal expansion coefficient of the thermal insulation ring (200) is not less than the thermal expansion coefficient of the heater (100).

3. The thermal field for a single crystal furnace according to claim 2, characterized in that: The material of the thermal insulation ring (200) is zirconium oxide, zirconium carbide, titanium carbide, niobium carbide, hafnium carbide or tantalum carbide.

4. The thermal field for a single crystal furnace according to claim 1, characterized in that: The fixing ring (300) is made of carbon-carbon material.

5. The thermal field for a single crystal furnace according to claim 1, characterized in that: The heat-insulating unit body (210) is provided with a raised portion (211) and a recessed portion (212) on both sides of the heat-insulating ring (200) in the circumferential direction, respectively; two heat-insulating unit bodies (210) adjacent in the circumferential direction are spliced ​​by a group of the raised portions (211) and the recessed portions (212) that cooperate with each other.

6. The thermal field for a single crystal furnace according to claim 5, characterized in that: The cross sections of the raised portion (211) and the recessed portion (212) are both arranged in a "V" shape.

7. The thermal field for a single crystal furnace according to claim 5, characterized in that: The cross sections of the raised portion (211) and the recessed portion (212) are both arranged to be wavy in shape.

8. The thermal field for a single crystal furnace according to claim 1, characterized in that: The cross section of the heat preservation unit body (210) is arranged in a "V" shape, and two sides of the "V" shape of the heat preservation unit body (210) abut against the outer side of the heater (100).

9. The thermal field for a single crystal furnace according to claim 1, characterized in that: The cross section of the heat preservation unit body (210) is arranged to be arc-shaped, and the inner side of the heat preservation unit body (210) abuts against the outer side of the heater (100).

10. A single crystal furnace, characterized in that: The single crystal furnace comprises the thermal field for a single crystal furnace as described in any one of claims 1-9.

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