Spliced single crystal furnace bottom heater

Abstract

The utility model relates to the technical field of monocrystalline silicon preparation in the photovoltaic industry, in particular to a spliced single crystal furnace bottom heater, which comprises two heater foot plates and four heating body units, the four heating body units are linked to form a symmetrical structure, and the two heater foot plates are fixedly connected to two opposite sides of the four heating body units respectively. According to the utility model, the area of the heater can be reduced, the processing cost is saved, the disassembly, replacement and maintenance are convenient, and the packaging and transportation cost can be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of single crystal silicon preparation in the photovoltaic industry, in particular to a spliced single crystal furnace bottom heater. Background Art

[0002] At present, the Czochralski method is generally used for the preparation of single crystal silicon in the photovoltaic industry. In a single crystal furnace, generally, an annular main heater surrounding the crucible and a bottom heater at the bottom of the crucible jointly provide heat energy for the thermal field. Currently, most of the bottom heaters are plate structures, which are integrally formed by processing. They have a large volume, complex production and processing. When local damage and failure occur, overall maintenance or the whole unit needs to be scrapped, with great maintenance difficulty and high cost. Content of the Utility Model

[0003] The utility model provides a spliced single crystal furnace bottom heater, which solves the problems of integral processing and forming, large overall area, and great processing and maintenance difficulty.

[0004] In order to achieve the purpose of the utility model, the technical solution adopted is: a spliced single crystal furnace bottom heater, including two heater foot plates and four heating element units. The four heating element units are interconnected in a ring to form a symmetrical structure, and the two heater foot plates are respectively fixedly connected to opposite sides of the four heating element units.

[0005] As an optimized scheme of the utility model, the heater foot plate is a rounded isosceles triangle.

[0006] As an optimized scheme of the utility model, the two ends of the heater foot plate are respectively provided with first semi-circular ring steps with opposite directions. The first semi-circular ring steps are used for splicing with the heating element units, and the thickness of the first semi-circular ring steps is half of the thickness of the heater foot plate.

[0007] As an optimized scheme of the utility model, bolt holes are provided on the first semi-circular ring steps.

[0008] As an optimized scheme of the utility model, the two ends of the heating element unit are respectively provided with second semi-circular ring steps with opposite directions. One end of the second semi-circular ring step is connected to the heater foot plate, and the other end is connected to another heating element unit. The thickness of the second semi-circular ring step is half of the thickness of the heater foot plate.

[0009] As an optimized scheme of the utility model, bolt holes are provided on the second semi-circular ring steps.

[0010] As an optimized scheme of the utility model, one heating element unit is arranged on the left and one on the right, with opposite installation orientations, and they are symmetrically spliced end to end with the central axis of the single crystal furnace as the symmetry axis.

[0011] As an optimized solution of the present utility model, the contact surface between the heater foot plate and the heating element unit is connected by graphite glue and fastened with carbon-carbon bolts.

[0012] The present utility model has positive effects: 1) The present utility model is assembled by splicing the heater foot plate and the heating element unit, which can reduce the area of the heater, not only saving processing costs, but also facilitating disassembly, replacement and maintenance, and at the same time saving the costs of packaging and transportation;

[0013] 2) The present utility model is designed in a modular form. When a certain component is damaged, only the damaged part needs to be replaced, without replacing the entire heater, greatly reducing the maintenance cost;

[0014] 3) The symmetrical arrangement and the end-to-end connection design of the heating element unit of the present utility model can ensure uniform heat distribution in the entire furnace cavity, easily form a stable temperature gradient, thereby providing a good thermal field environment for crystal growth and improving the crystal formation efficiency;

[0015] 4) By using a heater foot plate in the shape of a rounded isosceles triangle, the present utility model not only improves the structural stability, but also reduces the stress concentration caused by thermal expansion, contributing to an extended service life. Description of the Drawings

[0016] The following further elaborates on the present utility model in detail in conjunction with the drawings and specific embodiments.

[0017] Figure 1 is the overall schematic diagram of the present utility model;

[0018] Figure 2 is the structural schematic diagram of the heater foot plate of the present utility model;

[0019] Figure 3 is the front view of the heater foot plate of the present utility model;

[0020] Figure 4 is the structural schematic diagram of the heating element unit of the present utility model;

[0021] Figure 5 is the front view of the heating element unit of the present utility model;

[0022] Among them: 1. Heater foot plate, 2. Heating element unit, 11. First semi-circular ring step, 21. Second semi-circular ring step. Detailed Embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this patent clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model.

[0024] The following description of at least one exemplary embodiment is merely illustrative and in no way restrictive of the present utility model and its application or use. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present utility model.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present utility model.

[0026] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. For technologies, methods, and devices known to those skilled in the art, detailed discussions may not be made. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as limitations. Therefore, other example numerical values of the exemplary embodiments may have different values.

[0027] As Figure 1 shown, the present utility model discloses a spliced single crystal furnace bottom heater, which includes two heater foot plates 1 and four heating element units 2. The four heating element units 2 are interconnected in a ring to form a symmetric structure, and the two heater foot plates 1 are respectively fixedly connected to the opposite sides of the four heating element units 2.

[0028] Specifically, the two heater foot plates 1 have the same shape and structure, and the four heating element units 2 have the same structural shape. The two heater foot plates 1 are located on both sides of the spliced single crystal furnace bottom heater. One heater foot plate has its front side facing up, and the other heater foot plate has its front side facing down. The four heating element units 2 in the middle are symmetrically spliced with the heater foot plates 1 in a symmetric direction. The splicing of the four heating element units 2 can also locally replace and repair the heating element part. At the same time, during disassembly, assembly, and transportation, the volume is small, and space can be saved.

[0029] The heater foot plate 1 is a rounded isosceles triangle. By being set as a rounded isosceles triangle, good structural stability can be provided during thermal expansion, and setting it as a rounded shape also helps to reduce the risk of overheating. There is a circular hole in the middle of the heater foot plate 1 for fixing with the electrode post.

[0030] As Figures 2-3 described, the two ends of the heater foot plate 1 are respectively provided with first semi-circular ring steps 11 with opposite directions. The first semi-circular ring steps 11 are used for splicing with the heating element units 2. The thickness of the first semi-circular ring steps 11 is half of the thickness of the heater foot plate 1. Bolt holes are provided on the first semi-circular ring steps 11.

[0031] AsFigures 4-5 As shown, two end portions of the heating element unit 2 are respectively provided with second semi-circular steps 21 having the same direction. One end of the second semi-circular step 21 is connected to the heater foot plate 1, and the other end of the second semi-circular step 21 is connected to another heating element unit 2. Bolt holes are provided on the second semi-circular step 21. By providing the bolt holes, the heater foot plate 1 and the heating element unit 2, the heating element unit 2 and the heating element unit 2, the heating element unit 2 and the heater foot plate 1, the heating element unit 2 and the heating element unit 2, the heating element unit 2 and the heater foot plate 1 are connected end to end to form a closed whole. Using bolts for connection makes the installation and disassembly simpler and faster.

[0032] There is one heating element unit 2 on each of the left and right sides, and the installation orientations are opposite. They are symmetrically spliced end to end with respect to the central axis of the single crystal furnace. This structure can ensure uniform heat distribution throughout the furnace cavity, which is beneficial to improving the quality and efficiency of crystal growth. By symmetrically arranging the heating element units, energy loss can be reduced and energy utilization efficiency can be improved.

[0033] First, apply graphite glue to the contact surface between the heater foot plate and the heater unit, insert a carbon-carbon bolt into the bolt hole for fastening, and after it is completely dry, polish the excess glue clean before it can be put into use.

[0034] In the above-described specific embodiments, the purpose, technical solutions, and beneficial effects of the present invention have been further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A spliced ​​single crystal furnace bottom heater, characterized in that: It comprises two heater foot plates (1) and four heating element units (2), wherein the four heating element units (2) are interlocked to form a symmetrical structure, and the two heater foot plates (1) are respectively fixedly connected to opposite sides of the four heating element units (2).

2. The spliced ​​single crystal furnace bottom heater according to claim 1, characterized in that: The heater foot plate (1) is an isosceles triangle with rounded corners.

3. The spliced ​​single crystal furnace bottom heater according to claim 1, characterized in that: The two ends of the heater foot plate (1) are respectively provided with first semi-circular steps (11) in opposite directions, the first semi-circular steps (11) are used for splicing with the heating element unit (2), and the thickness of the first semi-circular steps (11) is half the thickness of the heater foot plate (1).

4. The spliced ​​single crystal furnace bottom heater according to claim 3 is characterized in that: The first semicircular ring step (11) is provided with bolt holes.

5. The spliced ​​single crystal furnace bottom heater according to claim 3, characterized in that: The two ends of the heating element unit (2) are respectively provided with second semicircular steps (21) in the same direction, one end of the second semicircular step (21) is connected to the heater foot plate (1), and the other end of the second semicircular step (21) is connected to another heating element unit (2), and the thickness of the second semicircular step (21) is half the thickness of the heater foot plate (1).

6. The spliced ​​single crystal furnace bottom heater according to claim 5, characterized in that: The second semicircular ring step (21) is provided with bolt holes.

7. The spliced ​​single crystal furnace bottom heater according to claim 1, characterized in that: The two heating element units (2) are one on each side, installed in opposite directions, and symmetrically connected end to end along the central axis of the single crystal furnace.

8. The spliced ​​single crystal furnace bottom heater according to claim 1, characterized in that: The contact surface between the heater foot plate (1) and the heating element unit (2) is connected by graphite glue and fastened by carbon-carbon bolts.

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