Single crystal furnace

Abstract

The utility model provides a single crystal furnace which comprises a single crystal furnace body provided with a furnace chamber and a furnace cover; the heat preservation assembly is arranged at the upper part of the furnace chamber and comprises a first heat preservation part and a second heat preservation part arranged above the first heat preservation part; and the second heat preservation part extends upwards to the furnace cover. The second heat preservation piece extending to the top of the furnace body is additionally arranged above the first heat preservation piece, a double-layer heat preservation structure is formed, and the heat preservation effect of the upper portion of the furnace cavity is remarkably improved; and meanwhile, the extension design of the second heat preservation piece eliminates the heat loss space at the top of the furnace body, heat loss in the top area is avoided, and heat loss is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the photovoltaic field, specifically to a single crystal furnace. Background Technology

[0002] With the continuous development of the global economy and the acceleration of modernization, the demand for efficient energy is constantly rising. Photovoltaic power generation, as an important green and sustainable energy source, has become a key development direction for countries worldwide, and monocrystalline silicon wafers, as the basic material for photovoltaic power generation, have broad market application prospects. In the production process of monocrystalline silicon rods, the Czochralski method is typically used, a process that requires a high-temperature environment. In existing technologies, the monocrystalline furnace uses a continuous water cooling medium to control the equipment temperature, but this cooling method causes temperature losses during the crystal pulling process.

[0003] Currently, the process of monocrystalline silicon melting and crystallization requires a thermal field to provide insulation and support. This is not only a necessary condition for ensuring the production of monocrystalline silicon but also an important parameter for evaluating low-carbon indicators. Under existing thermal field insulation conditions, the average power consumption of the furnace reaches 50-70 kW / h. The industry has not yet developed relevant technical patents for the utilization of furnace lid space in existing monocrystalline furnace thermal fields, indicating that there is still room for improvement in improving furnace space utilization. Therefore, how to effectively reduce furnace energy consumption and carbon emissions while ensuring production efficiency has become an urgent technical problem to be solved. Utility Model Content

[0004] The purpose of this invention is to solve the problem of high energy consumption caused by severe heat dissipation at the top of the single crystal furnace in the prior art.

[0005] This utility model provides a single crystal furnace, comprising:

[0006] A single crystal furnace body, wherein the single crystal furnace body has a furnace cavity;

[0007] The heat insulation component is disposed on the upper part of the furnace cavity, and the heat insulation component includes a first heat insulation element and a second heat insulation element disposed above the first heat insulation element;

[0008] The second insulation element extends upward to the furnace cover.

[0009] Furthermore, the first and second insulation components are PAN-based felt or adhesive-based felt.

[0010] Furthermore, the second insulation component is cylindrical, with an outer diameter of 1000mm-1500mm, an inner diameter of 400mm-600mm, and a height of 400mm-600mm.

[0011] Furthermore, the second insulation component is provided with an observation hole, which penetrates through the second insulation component.

[0012] Furthermore, the end of the observation hole near the furnace cavity is tilted towards the center of the single crystal furnace body, and the tilt angle is 10°-18°.

[0013] Furthermore, it also includes a cooling component, one end of which extends through the insulation component and the furnace cover, and the other end is placed inside the furnace cavity.

[0014] Furthermore, it also includes:

[0015] A flow guiding assembly, which is placed inside the furnace cavity, includes an inner flow guiding assembly and an outer flow guiding assembly;

[0016] A cooling assembly, one end of which penetrates the insulation assembly and the furnace cover;

[0017] The observation hole corresponds to the position of the flow guiding component.

[0018] Furthermore, the inner and outer flow guiding components form a gas circulation channel, with the inner flow guiding component guiding the inert gas downward and the outer flow guiding component guiding the gas upward backflow.

[0019] Furthermore, the second insulation component is provided with a clearance structure, which is connected to the observation hole.

[0020] Furthermore, the clearance structure includes a through hole disposed on the second insulation member, through which the flow guiding component and the cooling component penetrate the furnace cover.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects: by adding a second insulation component extending to the top of the furnace body above the first insulation component, a double-layer insulation structure is formed, which significantly improves the insulation effect of the upper part of the furnace cavity; at the same time, the extension design of the second insulation component eliminates the heat loss space at the top of the furnace body, avoids the loss of heat in the top area, and effectively reduces heat loss. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the internal structure of a single crystal furnace in the prior art;

[0024] Figure 2This is a schematic diagram of the internal structure of a single crystal furnace in one embodiment of the present invention;

[0025] Figure 3 This is a top view of the second insulation component in one embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the second heat-insulating component in one embodiment of the present invention.

[0027] Among them, 100-furnace body; 200-furnace cover; 300-thermal system; 2-single crystal furnace body; 21-observation channel; 22-furnace cover; 23-second insulation component; 24-first insulation component; 25-cooling component; 26-inner flow guide component; 27-outer flow guide component; 31-observation hole; 32-flow guide component lifting hole; 33-cooling component lifting hole; 34-outer edge of second insulation component. Detailed Implementation

[0028] The present invention will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being broadly known to those skilled in the art and is not intended to limit the present invention.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] The present invention will be described in more detail below by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0031] Please refer to Figure 1This is a schematic diagram of the internal structure of a conventional single crystal furnace. The conventional single crystal furnace includes core components such as the furnace body 100, furnace cover 200, and thermal system 300. However, several major problems exist: the space in the furnace platform is not properly filled, and there is a large unfilled space at the furnace cover, leading to heat absorption. Simultaneously, heat convection occurs due to airflow within the cavity, and the existing insulation felt structure fails to effectively optimize the use of these spaces. All of these factors affect the temperature field stability and energy efficiency during single crystal growth.

[0032] Based on this, this utility model embodiment provides a single crystal furnace, please refer to... Figure 2 ,include:

[0033] A single crystal furnace body 2, wherein the single crystal furnace body 2 has a furnace cavity;

[0034] The heat insulation component is disposed in the upper part of the furnace cavity. The heat insulation component includes a first heat insulation element 24 and a second heat insulation element 23 disposed above the first heat insulation element 24. The second heat insulation element 23 extends upward to the furnace cover 22.

[0035] Specifically, the main function of the insulation component is to reduce heat loss, thereby improving the insulation effect of the thermal field. The first insulation element 24 serves as the base of the insulation component, and the second insulation element 23 positioned above it further enhances the insulation effect. The second insulation element 23 extends upwards to the furnace cover 22. By extending the insulation filling structure upwards to the inside of the furnace cover 22, the structure of the insulation component is optimized, effectively reducing heat loss during the crystal pulling process in the single crystal furnace, thereby reducing energy consumption.

[0036] Furthermore, the first insulation element 24 and the second insulation element 23 can be PAN-based felt or viscose-based felt.

[0037] Specifically, PAN-based felt is an insulation material made of polyacrylonitrile fibers, possessing excellent high-temperature resistance and good thermal insulation properties. Viscose-based felt, on the other hand, is made of viscose fibers and also exhibits good thermal insulation performance. Both materials effectively reduce heat loss in high-temperature environments, thereby improving the thermal efficiency of single-crystal furnaces.

[0038] As a preferred embodiment, PAN-based felt can be further improved in terms of heat resistance and mechanical strength through high-temperature carbonization. Viscose-based felt can have its fire resistance enhanced by adding flame retardants. Furthermore, both materials can be adapted to different insulation requirements by adjusting the fiber density and thickness.

[0039] As an example, the first insulation element 24 may be a solid felt cover.

[0040] It is understood that the above are merely illustrative examples of optional insulation materials. Those skilled in the art can flexibly select other types of insulation materials according to actual needs, and all such selections should be considered within the scope of the present invention.

[0041] Furthermore, the second insulation component 23 is cylindrical, with an outer diameter of 1000mm-1500mm, a height of 400mm-600mm, and an inner diameter of 400mm-600mm.

[0042] In a preferred embodiment, the outer diameter and height of the second insulation component 23 can be adjusted according to the specific dimensions of the single crystal furnace to adapt to different models of single crystal furnaces. Therefore, the second insulation component 23 can not only effectively reduce energy consumption during the crystal pulling process of the single crystal furnace, but also improve the utilization rate of the furnace space. Specifically, by optimizing the dimensions of the second insulation component 23, the overall average power consumption of the furnace can be reduced, thereby effectively reducing energy consumption while ensuring production efficiency. Preferably, the outer diameter of the second insulation component 23 is 1350mm, the height is 500mm, and the inner diameter is 500mm.

[0043] For further details, please refer to... Figure 3 and Figure 4 The second insulation component 23 is provided with an observation hole 31, which penetrates the second insulation component 23.

[0044] Furthermore, the end of the observation hole near the furnace cavity is inclined toward the center of the single crystal furnace body 2, and the inclination angle is 10°-18°.

[0045] Specifically, the observation hole 31 is located on the second insulation component 23, forming an observation channel 21 when viewed downwards. This observation channel 21 allows operators to directly observe the furnace interior during operation, thus better monitoring the crystal pulling process. Correspondingly, the furnace cover 22 has an observation window that works in conjunction with the observation hole 31 to ensure comprehensive and real-time observation, avoiding blind spots caused by observation dead angles. The observation hole 31 can be designed in various ways. For example, it can be a straight channel running through the upper and lower surfaces of the second insulation component 23, ensuring straightness and clarity of observation. As a preferred embodiment, the observation hole 31 is tilted towards the center of the single crystal furnace body 2 at an angle of 15°. This design facilitates better observation of the crystal pulling process in the central area of ​​the furnace. Furthermore, the diameter of the observation hole 31 can be adjusted according to actual needs to ensure both clarity of observation and ease of operation.

[0046] Furthermore, it also includes:

[0047] A flow guiding component is placed inside the furnace cavity, and the flow guiding component includes an inner flow guiding component 26 and an outer flow guiding component 27.

[0048] The observation hole 31 corresponds to the position of the flow guiding component.

[0049] The position and angle of the observation hole 31 correspond to the flow guiding component, ensuring that one end of the observation channel 21 is tilted toward the center of the single crystal furnace body 2.

[0050] Specifically, the flow guiding components can be set up by arranging multiple flow guides inside the furnace cavity. The shape and angle of the flow guides can be adjusted according to the gas flow requirements.

[0051] Furthermore, the inner guide component 26 and the outer guide component 27 form a gas circulation channel, the inner guide component 26 is used to guide the inert gas to flow downward, and the outer guide component 27 is used to guide the gas to flow back upward.

[0052] Specifically, the design of the inner flow guide component 26 and the outer flow guide component 27 enables the gas to circulate within the furnace cavity. The inner flow guide component 26, through its inclined design, guides the inert gas to the lower part of the furnace cavity, thus providing a stable gas environment during crystal pulling. The outer flow guide component 27 guides the gas upwards, ensuring uniform gas distribution within the furnace cavity and preventing localized overheating or underheating. This gas circulation channel design not only improves temperature uniformity within the furnace cavity but also effectively reduces heat loss, thereby lowering energy consumption.

[0053] In a preferred embodiment, the inner flow guiding component 26 can be a spiral flow guide vane. Through this spiral structure, the inert gas can flow downwards along the vane and be evenly distributed during the flow. The outer flow guiding component 27 can be designed as an annular flow guide vane, which can guide the gas upwards and back, forming a circulation with the airflow of the inner flow guiding component 26 during the backflow process. In this embodiment, the inner flow guiding component 26 is fitted inside the outer flow guiding component 27, wherein the inner walls of both the inner and outer flow guiding components are inclined to achieve gas guidance. Furthermore, the materials of the inner flow guiding component 26 and the outer flow guiding component 27 can be selected from high-temperature resistant ceramic materials to ensure stability and durability in high-temperature environments.

[0054] Furthermore, it also includes:

[0055] The cooling component 25 has one end extending through the insulation component and the furnace cover 22, and the other end placed inside the furnace cavity.

[0056] The cooling assembly 25 can be water-cooled or air-cooled, with the cooling medium passing through the insulation assembly and furnace cover 22 via pipes to ensure stable temperature control of the equipment. In this embodiment, the cooling assembly 25 is configured as a water-cooled screen piping system.

[0057] Furthermore, the second insulation component 23 is provided with a clearance structure, which is connected to the observation hole 31.

[0058] Specifically, since the flow guiding component needs to be raised and lowered, a clearance structure is set to ensure that the flow guiding component and the cooling component 25 can smoothly pass through the furnace cover 22, while maintaining the heat preservation performance of the second heat preservation component 23.

[0059] Furthermore, the clearance structure includes a through hole provided on the second insulation member 23, through which the flow guiding component and the cooling component 25 penetrate the furnace cover 22.

[0060] Specifically, the clearance structure includes a flow guide assembly lifting hole 32 and a cooling assembly lifting hole 33. The diameter and position of the through holes can be adjusted according to actual needs. For example, the diameter of the through holes can be slightly larger than the diameters of the flow guide assembly and the cooling assembly 25 to facilitate installation and disassembly. Furthermore, the position of the through holes should correspond to the installation positions of the flow guide assembly and the cooling assembly 25 to ensure that the cooling assembly 25 can accurately pass through the second insulation member 23 and extend to the outside of the furnace cover 22, and to ensure smooth lifting and lowering of the flow guide assembly.

[0061] In this embodiment, a through-hole is a preferred implementation. The inner wall of the through-hole can be provided with a sealing structure to prevent gas leakage. The sealing structure can be made of a high-temperature resistant material to ensure good sealing performance even in high-temperature environments. Furthermore, the edges of the through-hole can be provided with a reinforcing structure to improve the mechanical strength of the second insulation member 23 and prevent the strength of the second insulation member 23 from decreasing due to the presence of the through-hole. The through-hole allows the flow guiding assembly and the cooling assembly 25 to effectively exchange heat and flow gas without damaging the overall structure of the second insulation member 23. For example, the through-hole can be designed as circular or elliptical to accommodate flow guiding assemblies and cooling assemblies 25 of different shapes and sizes.

[0062] Therefore, the technical solution of this application, by setting a clearance structure, allows the flow guiding component and the cooling component 25 to smoothly pass through the second insulation component 23 and extend to the outside of the furnace cover 22, thereby realizing gas circulation and cooling functions. Compared with the prior art, this solution not only improves the space utilization of the furnace platform but also reduces temperature loss, thereby effectively reducing the energy consumption of the furnace platform. Through the setting of the clearance structure, the flow guiding component can guide the inert gas to flow downward, while the outer flow guiding component 27 guides the gas to flow upward back, forming a gas circulation channel, thereby improving the heat preservation effect of the thermal field. At the same time, the cooling component 25, through the clearance structure penetrating the furnace cover 22, can effectively control the equipment temperature and reduce temperature loss during the crystal pulling process.

[0063] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A single crystal furnace, characterized in that, include: A single crystal furnace body, wherein the single crystal furnace body has a furnace cavity and a furnace cover; The insulation component is disposed on the upper part of the furnace cavity. The insulation component includes a first insulation element and a second insulation element disposed above the first insulation element. The second insulation element extends upward to the furnace cover.

2. The single crystal furnace according to claim 1, characterized in that, The first insulation component and the second insulation component are PAN-based felt or viscose-based felt.

3. The single crystal furnace according to claim 2, characterized in that, The second insulation component is cylindrical, with an outer diameter of 1000mm-1500mm, an inner diameter of 400mm-600mm, and a height of 400mm-600mm.

4. The single crystal furnace according to claim 2, characterized in that, The second insulation component is provided with an observation hole, which penetrates the second insulation component.

5. The single crystal furnace according to claim 4, characterized in that, The observation hole is inclined from away from the furnace cover toward the center of the single crystal furnace body, and the inclination angle is 10°-18°.

6. The single crystal furnace according to claim 4, characterized in that, It also includes a cooling component, one end of which extends through the insulation component and the furnace cover, and the other end is placed inside the furnace cavity.

7. The single crystal furnace according to claim 4, characterized in that, Also includes: A flow guiding assembly, which is placed inside the furnace cavity, includes an inner flow guiding assembly and an outer flow guiding assembly; The observation hole corresponds to the position of the flow guiding component.

8. The single crystal furnace according to claim 7, characterized in that, The inner and outer flow guiding components form a gas circulation channel. The inner flow guiding component guides the inert gas to flow downwards, and the outer flow guiding component guides the gas to flow upwards back.

9. The single crystal furnace according to claim 4, characterized in that, The second insulation component is provided with a clearance structure, which is connected to the observation hole.

10. The single crystal furnace according to claim 9, characterized in that, The clearance structure includes a through hole provided on the second insulation member, through which the flow guiding component and the cooling component pass through the furnace cover.

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