A heating device for powder purification in a czochralski method

Abstract

The utility model relates to the technical field of silicon powder heating, specifically relates to a heating device for powder purification of direct pulling method, including heating block, the lower part of heating block is provided with the footboard, the footboard is connected with heating block through the connecting device, the connecting device includes the connecting hole of setting at the top of footboard, the bottom of connecting hole is provided with the plug pipe, a plurality of expansion joints are provided on the pipe body of plug pipe, improve the fixed effect of connection, guarantee the safe use, prolong the life, reduce the production cost.

Description

Technical Field

[0001] This utility model relates to the field of silicon powder heating technology, specifically to a heating device for the purification of silicon powder using the Czochralski method. Background Technology

[0002] The photovoltaic industry is poised for rapid growth. The cost of monocrystalline furnaces is a common concern among industry professionals. The reduction of non-silicon costs is the driving force for the continued and effective development of monocrystalline silicon. The heating device used in the Czochralski method for producing monocrystalline silicon cannot meet the needs of powder purification. Silicon vapor generated during silicon powder pulling adheres to the heating device. Conventionally designed screw holes are prone to cracking after adhesion. The large amount of silicon vapor adhering to the device causes uneven heating, affecting the crucible's edge collapse, bulging, and other abnormalities, thus affecting the silicon powder purification efficiency and increasing production costs. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technology in which screw holes are easily damaged during heating of powder produced by the Czochralski method, and to provide a heating device for purifying powder produced by the Czochralski method.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a heating device for purifying powder using the direct-pull method, comprising a heating block, a foot plate provided at the lower part of the heating block, the foot plate being connected to the heating block via a connecting device, the connecting device including a connecting hole provided at the top of the foot plate, a plug tube provided at the bottom of the connecting hole, and multiple expansion joints provided on the body of the plug tube.

[0005] Furthermore, the lower part of the heating block is provided with a fixing hole that matches the connecting hole, and the plug tube is snapped into the fixing hole.

[0006] Furthermore, the ports of both the connecting hole and the fixing hole are countersunk.

[0007] Furthermore, the heating element is connected to the foot plate using carbon fiber bolts.

[0008] Furthermore, a stepped groove is provided at the connection between the heating block and the foot plate for engagement.

[0009] Furthermore, the expansion joint is inclined.

[0010] The beneficial effects of this embodiment are as follows: A connecting hole is provided at the top of the foot plate, and a plug tube is provided at the bottom of the connecting hole. Multiple expansion joints are provided on the body of the plug tube. When silicon vapor adheres to the heating device and generates stress, the expansion joints can buffer and release the stress through their own expansion and contraction. A carbon-carbon bolt is provided in the middle of the plug tube for connection. Carbon-carbon material has excellent high-temperature performance and can maintain stable physical and chemical properties in the high-temperature environment of Czochralski production, making it less prone to deformation and damage. Using carbon-carbon bolts to connect the heating block and the foot plate not only ensures a firm connection but also meets the requirements of high-temperature environments, ensuring the stability of the heating device during long-term operation. Furthermore, the use of carbon-carbon nuts prevents the threads from being exposed inside the plug tube during use, improving the connection's fixing effect, ensuring safety, extending service life, and reducing production costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the fixing hole structure of this utility model;

[0013] Figure 3 This is a schematic diagram of the plug tube structure of this utility model;

[0014] Figure 4 For the present utility model

[0015] In the diagram: 1. Heating block; 101. Fixing hole; 102. Plug tube; 103. Expansion joint; 2. Foot plate; 201. Connecting hole. Detailed Implementation

[0016] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0017] See Figures 1 to 4 This utility model discloses a heating device for powder purification by the direct pulling method, which mainly consists of a heating block 1 and a foot plate 2. The foot plate 2 is stably connected to the heating block 1 through a specific connecting device. The heating block 1 is designed with multiple petals, the overall resistance wire length is increased, the resistance is increased, the local operating temperature is increased, and the amount of silicon vapor adhering is reduced.

[0018] A foot plate 2 is provided at the lower part of the heating block 1. A connection hole 201 is provided at the top of the foot plate 2, and a plug tube 102 is provided at the bottom of the connection hole 201. Multiple expansion joints 103 are provided on the tube body of the plug tube 102. When silicon vapor adheres to the heating device and generates stress, the expansion joints 103 can buffer and release the stress through their own expansion and contraction deformation, effectively avoiding the problem of the heating device cracking due to stress concentration. The inclined setting of the expansion joints 103 on the plug tube 102 has a unique function. When subjected to stress, the inclined expansion joints 103 can distribute the stress more evenly, avoiding excessive stress concentration in a certain local area. Compared with the vertically set expansion joints 103, the inclined expansion joints 103 can better adapt to stress changes in different directions, improve the deformation capacity and buffering effect of the plug tube 102, and thus more effectively protect the heating device from stress damage caused by silicon vapor adhesion, reducing the probability of the connection hole 201 and the fixing hole 101 breaking.

[0019] The lower part of the heating block 1 is provided with a fixing hole 101 that mates with the connecting hole 201. The plug tube 102 can be snapped into the fixing hole 101. This snapping method makes the connection between the foot plate 2 and the heating block 1 tighter and more stable, and can withstand various external forces and thermal stresses during the Czochralski process. Four sets of fixing holes 101 and connecting holes 201 are provided at the connection point to improve the positioning effect and ensure the overall structural stability of the heating device. After the plug tube 102 is snapped in, a carbon carbon bolt is provided in the middle of the plug tube 102. Carbon carbon material has excellent high-temperature performance and can maintain stable physical and chemical properties in the high-temperature environment of the Czochralski process, making it less prone to deformation and damage. Using carbon carbon bolts to connect the heating block 1 and the foot plate 2 not only ensures a firm connection but also meets the requirements of high-temperature environments, ensuring the stability of the heating device during long-term operation. In addition, carbon carbon nuts are provided to prevent the threads from being exposed inside the plug tube 102 during use, improving the fixing effect of the connection and ensuring safe use.

[0020] To further optimize the connection structure, countersunk holes are made at the ends of both the connecting hole 201 and the fixing hole 101. Countersunk holes have several advantages. On the one hand, they can provide better positioning and guidance for the connecting components, making the connection process more accurate and convenient. On the other hand, countersunk holes can increase the contact area of ​​the connecting parts, improve the strength and reliability of the connection, and at the same time, they can improve stress distribution to a certain extent and reduce the impact of stress concentration on the connecting parts.

[0021] In addition, a stepped groove snap-fit ​​structure is provided at the connection between the heating block 1 and the foot plate 2. The stepped groove snap-fit ​​structure can further enhance the connection strength between the heating block 1 and the foot plate 2, prevent relative displacement between the two due to factors such as vibration or thermal stress during the production process. At the same time, the stepped groove snap-fit ​​structure can also play a certain sealing role, reduce the entry of impurities such as silicon vapor into the connection part, extend the service life of the heating device, improve the efficiency of silicon powder purification, and reduce production costs, which has significant economic and social benefits.

[0022] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0025] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A heating device for purifying powder using the Czochralski method, comprising a heating block, characterized in that: The lower part of the heating block is provided with a foot plate, which is connected to the heating block through a connecting device. The connecting device includes a connecting hole at the top of the foot plate, a plug tube at the bottom of the connecting hole, and multiple expansion joints on the body of the plug tube.

2. The heating device for powder purification by the Czochralski method according to claim 1, characterized in that: The lower part of the heating block is provided with a fixing hole that matches the connecting hole, and the plug tube is snapped into the fixing hole.

3. The heating device for powder purification by the Czochralski method according to claim 2, characterized in that: The ports of both the connecting holes and the fixing holes are countersunk.

4. The heating device for powder purification by the Czochralski method according to claim 3, characterized in that: The heating element is connected to the foot plate using carbon fiber bolts.

5. The heating device for powder purification by the Czochralski method according to claim 1, characterized in that: The connection between the heating block and the foot plate is provided with a stepped groove for locking.

6. The heating device for powder purification by the Czochralski method according to claim 1, characterized in that: The expansion joint is set at an angle.

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