A furnace bottom heat preservation device and a single crystal furnace

Abstract

The embodiment of the utility model provides a kind of furnace bottom heat preservation device and single crystal furnace, it is related to single crystal furnace heat preservation device technical field.The furnace bottom heat preservation device includes top cover and base, top cover is provided with multiple first buckle structure;Base is provided with multiple second buckle structure, multiple second buckle structure and multiple first buckle structure are set one by one correspondence;First buckle structure and corresponding second buckle structure can be detachably connected, to make top cover and base be connected with each other, and jointly enclosed to form closed chamber;Closed chamber is filled with heat preservation structure.By being designed as integrated structure, heat preservation material is set in the closed chamber inside furnace bottom heat preservation device, can protect heat preservation material, prolong service life, reduce cost, and sealing improves can reduce heat loss, reduce energy consumption.At the same time, felt wool and other heat preservation materials are placed in closed chamber, and the fire accident caused by felt wool falling can also be avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of single crystal furnace heat preservation devices, specifically to a furnace bottom heat preservation device and a single crystal furnace. Background Technology

[0002] With the rapid development of the solar photovoltaic industry, the entire crystalline silicon industry has also experienced rapid growth, and technological advancements within the industry are constantly progressing. The monocrystalline furnace is a crucial piece of equipment in the production process. In existing technologies, insulation felt is installed inside the monocrystalline furnace for heat preservation. The common practice is to place a curing felt at the bottom of the furnace, and then place 5 to 12 layers of soft felt on top of the curing felt to provide sufficient heat preservation.

[0003] However, existing furnace bottom insulation devices use multiple components for insulation, and are prone to fire accidents due to felt fibers. They also consume a lot of insulation material, resulting in high costs. Utility Model Content

[0004] This utility model provides a furnace bottom insulation device and a single crystal furnace, which can reduce the number of insulation structural components, protect the insulation material, reduce the damage to the insulation material, reduce costs, and also avoid fire accidents caused by felt fibers.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] An embodiment of this utility model provides a furnace bottom heat preservation device, which includes:

[0007] Top cover, wherein the top cover is provided with multiple first buckle structures;

[0008] The base is provided with a plurality of second buckle structures, and the plurality of second buckle structures are provided in a one-to-one correspondence with the plurality of first buckle structures;

[0009] The first snap-fit ​​structure and the corresponding second snap-fit ​​structure are detachably snapped together so that the top cover and the base are connected to each other and together enclose a sealed chamber; the sealed chamber is filled with a heat-insulating structure.

[0010] In an optional embodiment, the top cover has a first receiving cavity, and each of the first snap-fit ​​structures is located within the first receiving cavity; the base has a second receiving cavity, and each of the second snap-fit ​​structures is located within the second receiving cavity.

[0011] In an optional embodiment, the top wall of the top cover extends toward the base to form a plurality of first protrusions, each of the first protrusions having a slot to form the first snap-fit ​​structure;

[0012] The top wall of the base extends toward the top cover to form a plurality of second protrusions to form the second buckle structure, each of the second protrusions corresponding to one of the slots.

[0013] In an optional embodiment, both the first protrusion and the second protrusion are cylindrical; the cross-section of the slot is circular.

[0014] In an optional embodiment, a plurality of the first protrusions are evenly distributed on the top wall of the top cover; a plurality of the second protrusions are evenly distributed on the top wall of the base.

[0015] In an optional implementation, the extension length of the first protrusion is less than or equal to the height of the top cover.

[0016] In an optional embodiment, the furnace bottom insulation device is cylindrical.

[0017] In an optional embodiment, the outer wall of the top cover is coated with a silicon carbide coating;

[0018] And / or, the outer wall of the base is coated with a silicon carbide coating.

[0019] In an optional embodiment, both the top cover and the base are made of carbon-carbon composite material.

[0020] An embodiment of this utility model also provides a single crystal furnace, including a furnace body and a furnace bottom insulation device as described in any of the above embodiments, wherein the furnace bottom insulation device is disposed at the bottom of the furnace body.

[0021] The beneficial effects of the furnace bottom insulation device and single crystal furnace according to the embodiments of this utility model include, for example:

[0022] The furnace bottom insulation device includes a top cover and a base. The top cover has multiple first snap-fit ​​structures, and the base has multiple second snap-fit ​​structures, each corresponding to one of the first snap-fit ​​structures. The first snap-fit ​​structures and their corresponding second snap-fit ​​structures are detachably snapped together, allowing the top cover and base to connect and together form a sealed chamber. The sealed chamber is filled with insulation material. By designing the furnace bottom insulation device as an integrated structure, and placing the insulation material within the sealed chamber, the insulation material is protected, its service life is extended, costs are reduced, and improved sealing reduces heat loss and energy consumption. Simultaneously, placing insulation materials such as felt within the sealed chamber also prevents fire accidents caused by felt shedding. Furthermore, the snap-fit ​​structure between the top cover and base provides both fixation and positioning, making installation faster and more precise. The integrated structure combined with the snap-fit ​​structure reduces gaps, preventing fibers or particles from entering hazardous areas and improving safety. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the furnace bottom insulation device provided in an embodiment of the present utility model;

[0025] Figure 2 This is a perspective view of the furnace bottom insulation device provided in an embodiment of the present utility model;

[0026] Figure 3 This is a schematic diagram of the top cover provided in an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram of the base provided in an embodiment of the present invention.

[0028] Icons: 1000-Furnace bottom insulation device; 100-Top cover; 110-First snap-fit ​​structure; 111-First protrusion; 112-Slot; 120-First receiving cavity; 200-Base; 210-Second snap-fit ​​structure; 211-Second protrusion; 220-Second receiving cavity; 300-Sealed chamber. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0034] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0035] With the rapid development of the solar photovoltaic industry, the entire crystalline silicon industry has also experienced rapid growth, and technological advancements within the industry are constantly progressing. The single-crystal furnace is a crucial piece of equipment in production. In traditional single-crystal furnaces, heat dissipation from the furnace bottom can lead to uneven axial temperature gradients, affecting the stability of the crystal growth interface. Therefore, a furnace bottom insulation device is needed to ensure the stability and quality of crystal growth. In existing technologies, insulation felt is installed inside the single-crystal furnace for heat insulation. The common practice is to place a curing felt at the furnace bottom, and then place 5 to 12 layers of soft felt on top of the curing felt to provide sufficient heat insulation. However, existing furnace bottom insulation devices use multiple components for insulation, are prone to sparking accidents due to felt fibers, and suffer from significant material waste, resulting in high costs.

[0036] Based on this, please refer to Figure 1 and Figure 2 The furnace bottom insulation device 1000 provided in the embodiments of this utility model can effectively solve the aforementioned technical problems. This furnace bottom insulation device 1000 can reduce the number of insulation structural components, protect the insulation material, reduce damage to the insulation material, lower costs, and also prevent fire accidents caused by felt fibers. This furnace bottom insulation device 1000 is applied to single crystal furnaces; single crystal furnaces equipped with this furnace bottom insulation device 1000 also have the same functions as described above, and are not limited thereto.

[0037] The single crystal furnace in this embodiment includes a furnace body and a furnace bottom insulation device 1000. The furnace bottom insulation device 1000 is located at the bottom of the furnace body and is used to optimize the thermal field distribution, reduce heat loss, and improve the crystal growth quality. The furnace body provides a vacuum or inert gas environment and houses core components such as heaters, crucibles, and crystal pulling mechanisms. The furnace bottom insulation device 1000 maintains a stable axial temperature gradient by reducing heat dissipation from the furnace bottom, preventing "cold spots" or stress concentration at the crystal growth interface due to undercooling. When growing large-diameter crystals, the insulation device can work with the main heater to adjust the thermal field and suppress the diffusion of impurities (such as oxygen and carbon) into the crystal. Of course, the single crystal furnace may also include other structures to achieve the various functions required in the production process, which are not limited here.

[0038] Figure 1 This is a schematic diagram of the furnace bottom insulation device 1000 provided in an embodiment of the present utility model; Figure 2 This is a perspective view of the furnace bottom insulation device 1000 provided in an embodiment of this utility model. Figure 1 and Figure 2 As shown, the furnace bottom insulation device 1000 in this embodiment includes a top cover 100 and a base 200. The top cover 100 is provided with multiple first snap-fit ​​structures 110; the base 200 is provided with multiple second snap-fit ​​structures 210, each corresponding to one of the first snap-fit ​​structures 110. The first snap-fit ​​structures 110 and their corresponding second snap-fit ​​structures 210 are detachably snapped together, so that the top cover 100 and the base 200 are connected to each other and together enclose a sealed chamber 300. The sealed chamber 300 is filled with an insulation structure. By designing the furnace bottom insulation device 1000 as an integrated structure, the insulation material is placed in the sealed chamber 300 inside the furnace bottom insulation device 1000, which can protect the insulation material, extend its service life, reduce costs, and improve the sealing performance to reduce heat loss and energy consumption. At the same time, placing insulation materials such as felt in the sealed chamber 300 can also prevent fire accidents caused by felt falling off. Furthermore, the top cover 100 and the base 200 are connected by a snap-fit ​​structure, which serves both a fixing and positioning function, making installation faster and more precise. The integrated structure combined with the snap-fit ​​connection reduces gaps, prevents fibers or particles from entering hazardous areas, and improves safety.

[0039] Traditional furnace bottom insulation devices (1000) use multiple structural components, requiring the procurement of several independent parts such as furnace bottom protective mat, soft mat, graphite sheets, electrode sleeves, gas guide tubes, and central shaft sleeves. This results in a complex supply chain and long procurement cycles. By integrating the furnace bottom insulation device (1000) into a single unit, only a single component needs to be procured, reducing the number of suppliers, shortening the procurement cycle, and lowering management costs. Furthermore, traditional structures require layer-by-layer assembly, which is prone to misalignment or omissions. In this embodiment, the top cover (100) and base (200) of the furnace bottom insulation device (1000) are connected via a snap-fit ​​structure, allowing for faster and more precise installation. Traditional carbon felt is easily broken and prone to flaking, requiring frequent replacement. However, the furnace bottom insulation device (1000) in this embodiment forms a sealed chamber (300) within which the insulation material is placed, protecting the insulation material and extending its service life. This design also prevents short circuits caused by carbon felt fiber shedding, such as electrode arcing, and avoids the risk of gas leakage or thermal runaway due to loose components, thus improving safety and reliability. Furthermore, the integrated design makes it easier to achieve standardized production, adapt to different models of single crystal furnaces, and improves versatility.

[0040] Figure 3 This is a schematic diagram of the top cover 100 provided in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the base 200 provided in an embodiment of this utility model. Please refer to... Figure 3 and Figure 4 In this embodiment, the top cover 100 has a first receiving cavity 120, and each first snap-fit ​​structure 110 is located within the first receiving cavity 120; the base 200 has a second receiving cavity 220, and each second snap-fit ​​structure 210 is located within the second receiving cavity 220. By hiding the snap-fit ​​structures within the receiving cavities, external mechanical impacts or direct damage from high temperatures can be avoided, extending the service life. Furthermore, the receiving cavities provide a fixing space for the snap-fit ​​structures, ensuring a tight fit between the top cover 100 and the base 200, preventing misalignment or loosening. After the receiving cavities enclose the snap-fit ​​structures, the mating surfaces form a continuous sealed chamber 300, reducing heat leakage or intrusion of external impurities, especially preventing the escape of carbon felt fibers. In addition, this design also has a guiding function; the receiving cavities act as natural positioning grooves, eliminating the need for additional adjustments during installation, allowing for direct alignment to complete the splicing. The snap-fit ​​structures, located within the sealed chamber 300, are also protected, reducing the risk of high-temperature oxidation or corrosion, and extending the service life. In addition, the receiving cavity can provide a small expansion space for the snap-fit ​​structure, avoiding stress concentration in the structure due to thermal deformation.

[0041] Of course, the snap-fit ​​structure can also be set at other locations such as the side wall edge of the top cover 100 and the base 200, which is not limited here.

[0042] Please continue reading. Figure 3 and Figure 4Specifically, in this embodiment, the top wall of the cover extends towards the base 200 to form multiple first protrusions 111, each of which has a slot 112 to form a first snap-fit ​​structure 110. The top wall of the base 200 extends towards the top cover 100 to form multiple second protrusions 211 to form a second snap-fit ​​structure 210, each of which corresponds to a slot 112. Alternatively, slots 112 can be formed on the second protrusions 211, with the first protrusions 111 engaging with the slots 112 on the second protrusions 211. The slots 112 on the first protrusions 111 of the top cover 100 and the second protrusions 211 of the base 200 form a bidirectional engagement, which, compared to a unidirectional snap-fit, can resist lateral / longitudinal displacement caused by furnace vibration or thermal deformation. Designing the snap-fit ​​structure as a protrusion also enhances the overall structural strength.

[0043] In this embodiment, both the first protrusion 111 and the second protrusion 211 are cylindrical; the cross-section of the slot 112 is circular. The cylindrical structure exhibits consistent compressive and shear resistance in any direction, avoiding stress concentration at the corners. High-frequency vibrations during single-crystal furnace operation can cause microcracks at the corners of the polyhedral protrusions; the cylindrical, cornerless design extends fatigue life. When the material expands radially at high temperatures, the cylindrical protrusion and the circular slot 112 can expand concentrically, preventing jamming. Furthermore, the cylindrical surface contact allows for slight axial displacement, releasing thermal stress and preventing structural warping. Of course, the first protrusion 111 and the second protrusion 211 can also be rectangular or other shapes, which are not limited here. The cross-sectional shape of the slot 112 can also be square, polygonal, or other shapes, which are not limited here.

[0044] Furthermore, the first snap-fit ​​structure 110 and the second snap-fit ​​structure 210 can also be designed in other shapes and structures, which are not limited here.

[0045] To improve the deformation resistance of the furnace bottom insulation device 1000, in this embodiment, multiple first protrusions 111 are evenly distributed on the top wall of the top cover 100; multiple second protrusions 211 are evenly distributed on the top wall of the base 200. This even distribution design allows thermal stress or mechanical loads to be transmitted through multiple paths, avoiding localized overload. When the furnace body deforms at high temperatures, the evenly distributed protrusions form a matrix support, resulting in greater overall stiffness than a non-uniformly distributed structure. The even distribution of the first protrusions 111 and the second protrusions 211 ensures uniform heat diffusion and guarantees the uniformity of the furnace bottom temperature field.

[0046] Please see Figure 3 and Figure 4In this embodiment, the extension length of the first protrusion 111 is less than or equal to the height of the top cover 100. This design prevents the slot 112 from disengaging due to excessive elongation of the first protrusion 111 at high temperatures. The fact that the protrusion does not exceed the height of the body also ensures the overall structural seal, improves space utilization, and reduces the risk of fatigue cracks. Of course, the extension length of the first protrusion 111 can also be greater than the height of the top cover 100 to accommodate the second protrusion 211; the extension length of the second protrusion 211 can also be greater than or equal to the height of the base 200 to accommodate the slot 112 on the first protrusion 111.

[0047] To reduce material usage, grooves may be provided on the side of the top wall of the top cover 100 and the top wall of the base 200 away from the sealed chamber 300 at the corresponding positions of the first protrusion 111 and the second protrusion 211.

[0048] In this embodiment, the furnace bottom insulation device 1000 is cylindrical. The cylindrical structure naturally matches the single-crystal furnace cavity, allowing heat radiation to diffuse in concentric circles. The shell structure formed by the cylindrical top cover 100 and the base 200 also has high compressive strength and saves space. Of course, the furnace bottom insulation device 1000 can also be cuboid or other shapes, which are not limited here.

[0049] To improve the corrosion resistance and high-temperature resistance of the furnace bottom insulation device 1000, the outer wall of the top cover 100 in this embodiment is coated with a silicon carbide coating; and / or, the outer wall of the base 200 is coated with a silicon carbide coating. The silicon carbide coating can be applied to both the outer walls of the top cover 100 and the base 200 simultaneously, or only to the outer wall of the top cover 100, or only to the outer wall of the base 200; this is not limited here. Of course, other corrosion-resistant and high-temperature-resistant coatings can also be applied to the outer walls of the top cover 100 and the base 200; this is not limited here either.

[0050] To extend the service life of the furnace bottom insulation device 1000, both the top cover 100 and the base 200 in this embodiment are made of carbon-carbon composite material. Carbon-carbon composite material can withstand temperatures above 2000℃, and it is lightweight, has a low coefficient of thermal expansion, excellent thermal shock resistance, high-temperature stability, heat insulation, thermal shock resistance, and corrosion resistance, making it less prone to cracking during rapid temperature changes. Of course, the top cover 100 and base 200 can also be made of other high-temperature and corrosion-resistant materials such as ceramic fiber and graphite; this is not a limitation.

[0051] In summary, the furnace bottom insulation device 1000 includes a top cover 100 and a base 200. The top cover 100 is provided with multiple first snap-fit ​​structures 110; the base 200 is provided with multiple second snap-fit ​​structures 210, each corresponding to one of the first snap-fit ​​structures 110. The first snap-fit ​​structures 110 and their corresponding second snap-fit ​​structures 210 are detachably snapped together, allowing the top cover 100 and the base 200 to connect and together form a sealed chamber 300. The sealed chamber 300 is filled with an insulation structure. By designing the furnace bottom insulation device 1000 as an integrated structure, and placing the insulation material within the sealed chamber 300, the insulation material can be protected, its service life extended, and costs reduced. Furthermore, improved sealing reduces heat loss and energy consumption. Simultaneously, placing insulation materials such as felt within the sealed chamber 300 also prevents fire accidents caused by felt falling off. Furthermore, the top cover 100 and the base 200 are connected by a snap-fit ​​structure, which serves both a fixing and positioning function, making installation faster and more precise. The integrated structure combined with the snap-fit ​​connection reduces gaps, prevents fibers or particles from entering hazardous areas, and improves safety.

[0052] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A furnace bottom insulation device, characterized in that, include: Top cover (100), the top cover (100) is provided with a plurality of first snap-fit ​​structures (110); The base (200) is provided with a plurality of second buckle structures (210), and the plurality of second buckle structures (210) are provided in a one-to-one correspondence with the plurality of first buckle structures (110); The first snap-fit ​​structure (110) is detachably snapped into the corresponding second snap-fit ​​structure (210) so that the top cover (100) and the base (200) are connected to each other and together enclose a sealed chamber (300); the sealed chamber (300) is filled with a heat-insulating structure.

2. The furnace bottom insulation device according to claim 1, characterized in that, The top cover (100) has a first receiving cavity (120), and each of the first snap-fit ​​structures (110) is located in the first receiving cavity (120); the base (200) has a second receiving cavity (220), and each of the second snap-fit ​​structures (210) is located in the second receiving cavity (220).

3. The furnace bottom insulation device according to claim 2, characterized in that, The top wall of the top cover (100) extends toward the base (200) to form a plurality of first protrusions (111), and each of the first protrusions (111) is provided with a slot (112) to form the first buckle structure (110). The top wall of the base (200) extends toward the top cover (100) to form a plurality of second protrusions (211) to form the second snap-fit ​​structure (210), and each second protrusion (211) corresponds to one of the slots (112).

4. The furnace bottom insulation device according to claim 3, characterized in that, The first protrusion (111) and the second protrusion (211) are both cylindrical; the cross-section of the slot (112) is circular.

5. The furnace bottom insulation device according to claim 3, characterized in that, Multiple first protrusions (111) are evenly distributed on the top wall of the top cover (100); multiple second protrusions (211) are evenly distributed on the top wall of the base (200).

6. The furnace bottom insulation device according to claim 3, characterized in that, The extension length of the first protrusion (111) is less than or equal to the height of the top cover (100).

7. The furnace bottom insulation device according to claim 1, characterized in that, The furnace bottom insulation device (1000) is cylindrical.

8. The furnace bottom insulation device according to claim 1, characterized in that, The outer wall of the top cover (100) is coated with a silicon carbide coating; And / or, the outer wall of the base (200) is coated with a silicon carbide coating.

9. The furnace bottom insulation device according to claim 1, characterized in that, Both the top cover (100) and the base (200) are made of carbon-carbon composite material.

10. A single crystal furnace, characterized in that, It includes a furnace body and a furnace bottom insulation device (1000) as described in any one of claims 1-9, wherein the furnace bottom insulation device (1000) is disposed at the bottom of the furnace body.

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