Electrode column and single crystal furnace

Abstract

The utility model relates to the technical field of single crystal growth, in particular to an electrode column and a single crystal furnace, the electrode column comprises an electrode column body and an insulating coating positioned on the outer side of the electrode column body, and the insulating coating is fixed on the outer side of the electrode column body; an installation hole is formed in the bottom in the single crystal furnace, the installation hole is perpendicular to the surface of the bottom of the single crystal furnace, and a heat preservation layer used for surrounding the outer portion of the electrode column is further arranged in the installation hole, so that a gap does not need to be reserved between the electrode column and the heat preservation layer in advance. The insulating coating avoids the heat leakage phenomenon caused by an overlarge gap between the electrode column and the heat preservation layer while avoiding electric leakage at the side part of the electrode column, avoids heat loss of the single crystal furnace, reduces the heating time before the single crystal furnace works, saves the power consumption cost, and solves the problem of energy conservation.

Description

Technical Field

[0001] The utility model relates to the technical field of single crystal growth, in particular to an electrode column and a single crystal furnace. Background Art

[0002] At present, the main material of the electrode column in the single crystal furnace of the photovoltaic industry is graphite. Usually, a protective sheath is put on the outside of the electrode column, and the gap between the electrode column and the sheath is filled with insulating materials. Common insulating materials include quartz sand, ceramics or glass. The outer side of the sheath is an insulating layer (usually carbon material). Under high temperature conditions, the oxide in the insulating material is easy to react with the electrode column, and the sheath will also react with the insulating layer, resulting in varying degrees of corrosion damage to the electrode column, sheath, insulating layer, and insulating material. The existing sheaths of quartz and alumina materials are easy to damage and crack, and the gap between the electrode column and the insulating material is too large due to the different densities of the filling materials. There is heat leakage during use, so it is urgent to find a new method to solve this problem.

[0003] CN209082027U discloses an electrode column for a single crystal furnace, comprising: an electrode column upper body, a first threaded hole is provided in the middle of the electrode column upper body, the first threaded hole is fixed to the heater by bolts; and an external thread is provided on the outer circumference of the electrode column upper body; and an electrode column lower body, a filling hole is provided in the upper part of the electrode column lower body, and an internal thread is provided near the top of the filling hole; the internal thread is connected to the external thread on the electrode column lower body; and the filling hole is filled with insulating and heat-preserving materials; the bottom of the electrode column lower body has a second threaded hole, and the second threaded hole is connected to the electrode of an external power supply device. However, the electrode column in this technical solution is composed of a separate upper body and a lower body. In actual use, problems such as displacement to varying degrees may occur, which ultimately leads to heat leakage of the entire single crystal furnace, or increases energy loss and seriously reduces the service life of the electrode column or the single crystal furnace.

[0004] Based on the above-mentioned existing technologies, how to reduce energy loss and increase service life of electrode columns in the field of crystal growth is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve the above technical problems, the utility model provides an electrode column, which includes an electrode column body and an insulating coating located outside the electrode column body, and the insulating coating is fixed on the outside of the electrode column body.

[0006] Furthermore, the shape of the electrode column body includes but is not limited to a column or a cube.

[0007] Furthermore, an upper hole is provided at the upper part of the electrode column body, and a lower hole is provided at the lower part of the electrode column body. The upper hole and the lower hole are connected in the middle, and an exhaust hole is provided in the connected stage, and the exhaust hole is used to release or balance the internal pressure of the electrode column.

[0008] Furthermore, the exhaust hole passes through the side wall of the electrode column.

[0009] Furthermore, the thickness of the insulating coating is 1-3 mm.

[0010] Furthermore, the insulating coating is a boron nitride ceramic layer, and the material used for the boron nitride ceramic layer is boron nitride ceramic. By reducing heat loss, the insulating coating helps to maintain the stability of the internal temperature of the single crystal furnace, which is crucial for the single crystal growth process; a stable temperature environment helps to improve the quality and consistency of single crystal growth, thereby improving the performance of the final product.

[0011] A single crystal furnace uses the electrode column.

[0012] Furthermore, a mounting hole is provided at the bottom of the single crystal furnace, and the mounting hole is perpendicular to the bottom surface of the single crystal furnace. The mounting hole is also provided with an insulation layer for surrounding the outside of the electrode column, so that there is no need to reserve a distance between the electrode column and the insulation layer in advance, thereby avoiding heat loss of the single crystal furnace, reducing the heating time of the single crystal furnace before operation, saving electricity costs, and solving the problem of energy saving.

[0013] Furthermore, a protective plate pressing plate is provided on the upper part of the insulation layer, and an opening is provided on the upper part of the mounting hole. The electrode column passes through the opening and enters the mounting hole. The protective plate pressing plate is used to isolate the heater and the insulation layer provided in the single crystal furnace and to press the insulation layer more tightly.

[0014] Furthermore, the upper surface of the electrode column and the upper surface of the disc protection pressing sheet are in the same plane.

[0015] Furthermore, an electrode foot is provided on the upper part of the electrode column, and the electrode foot provides power for the operation of the single crystal furnace by contacting with the upper surface of the electrode column;

[0016] A first electrode bolt is provided in the electrode foot, and the first electrode bolt extends into the upper hole and is fixedly connected to the upper hole. The introduction of the first electrode bolt significantly enhances the connection stability between the electrode foot and the electrode column. Through the tightening effect of the first electrode bolt, electrical safety hazards such as leakage or short circuit caused by loose electrode foot can be effectively prevented.

[0017] Furthermore, a copper electrode is provided at the lower part of the electrode column, one end of the copper electrode is connected to the electrode column through a second electrode bolt, and the second electrode bolt extends into the lower hole and is fixedly connected to the lower hole;

[0018] The other end of the copper electrode is connected to a copper busbar, and the copper electrode is connected to an external power source through the copper busbar to supply power to the single crystal furnace.

[0019] Beneficial effects of the utility model:

[0020] 1. The utility model provides an electrode column with a new structure, which includes an electrode column body and an insulating coating located on the outside of the electrode column body. Due to the existence of the insulating coating, during the installation and use of the electrode column, it is no longer necessary to set a sheath or other insulating layer on the outside of the electrode column, or to fill the gap between the traditional electrode column and the sheath layer with insulating material. By fixing the insulating coating on the outside of the electrode column body, it can effectively avoid the reaction between the oxide in the insulating material and the electrode column, or between the sheath and the electrode column under high temperature conditions in the prior art, thereby causing the traditional electrode column, sheath, insulating layer, and insulating material to be corroded to varying degrees. The utility model proposes a new electrode column structure, which can completely solve the heat leakage phenomenon during use, help maintain the stability of the temperature inside the single crystal furnace, and reduce energy consumption at the same time.

[0021] 2. The electrode column provided by the utility model has a simple structure. Compared with the split electrode column in the prior art, it can effectively avoid the problems of different degrees of displacement of the upper body and the lower body during actual use, reduce energy loss, and effectively increase the service life of the electrode column or the single crystal furnace;

[0022] 3. Compared with the total thickness (about 10-40mm) of the sheath, insulation layer, insulating material, etc. wrapped on the outside of the traditional electrode column in the prior art, the thickness of the insulating coating on the electrode column of the utility model is only 1-3mm, which saves more space occupied by the electrode column and has a higher overall utilization rate. In addition, the electrode column of the utility model has a novel structure and is designed as an integral whole, which also eliminates the cumbersome process of adding sheaths, insulation layers, insulating materials, etc. layer by layer, and reduces technical problems such as high energy consumption caused by uneven filling and wrapping;

[0023] 4. The electrode column structure provided by the utility model can solve the problems of insulation and energy saving. There are nearly 100,000 single crystal furnaces in China. If all of them use the electrode columns provided by the utility model, 300,000 to 700,000 kWh of electricity can be saved per hour, and a total of 43 to 100 tons of standard coal can be saved;

[0024] 5. Compared with the prior art, the sheath and insulating materials used need to be replaced every 1.5-2 months on average. During replacement, the furnace needs to be cooled down and stopped, and the furnace body needs to be opened. The process requires an additional 4-8 hours of preparation time, which consumes a lot of manpower and material resources. The utility model can effectively increase the service life of the electrode column and save the cost of use. By using the electrode column provided by the utility model, each single crystal furnace can save 2,000 yuan in consumables each year and improve labor efficiency by 5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the cross-sectional structure of the electrode column provided by the utility model;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the electrode column and the single crystal furnace provided by the utility model;

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure of an electrode column and a single crystal furnace in the prior art;

[0028] 1. Insulation layer; 2. Electrode column; 3. Insulation coating; 4. Disc guard sheet; 401. Groove; 5. First electrode bolt; 6. Electrode foot; 7. Second electrode bolt; 8. Copper electrode; 9. Copper busbar; 10. Insulation material; 11. Sheath. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0030] Example 1

[0031] like Figure 1-2 As shown, the utility model provides an electrode column, which includes an electrode column body 2 and an insulating coating 3 located outside the electrode column body 2, and the insulating coating 3 is fixed on the outside of the electrode column body 2.

[0032] The insulating coating 3 prevents electric leakage from occurring at the side of the electrode column and also prevents heat leakage from occurring between the electrode column and the thermal insulation layer 1 due to an excessively large gap.

[0033] The shape of the electrode column body 2 is cylindrical in the present embodiment, and includes but is not limited to a column or a cube in some embodiments. As long as an insulating coating 3 is provided on the outside of the electrode column body 2, the same function can be achieved and they are all equivalent alternative solutions.

[0034] An upper hole is provided at the upper part of the electrode column body 2, and a lower hole is provided at the lower part of the electrode column body 2. The upper hole and the lower hole are connected in the middle, and an exhaust hole is provided at the stage of the connection, and the exhaust hole passes through the side wall of the electrode column.

[0035] In this embodiment, the thickness of the insulating coating is 2 mm.

[0036] In this embodiment, the material of the electrode column body 2 is graphite, and the insulating coating 3 is a boron nitride ceramic layer. The material used for the boron nitride ceramic layer is boron nitride ceramic. By reducing heat loss, the insulating coating 3 helps to maintain the stability of the temperature inside the single crystal furnace, which is crucial for the single crystal growth process; a stable temperature environment helps to improve the quality and consistency of single crystal growth, thereby improving the performance of the final product. In some embodiments, as long as the material of the electrode column body 2 or the insulating coating 3 can achieve the same effect, it belongs to an equivalent alternative solution.

[0037] like Figure 2 As shown, this embodiment also provides a single crystal furnace, using the electrode column in this embodiment.

[0038] A mounting hole is provided at the bottom of the single crystal furnace, and the mounting hole is perpendicular to the bottom surface of the single crystal furnace. A thermal insulation layer 1 is also provided in the mounting hole to surround the outside of the electrode column, so that no spacing needs to be reserved in advance between the electrode column and the thermal insulation layer 1, thereby avoiding heat loss of the single crystal furnace, reducing the heating time before the single crystal furnace works, saving electricity costs, and solving the problem of energy saving.

[0039] A protective plate pressing sheet 4 is provided on the upper part of the insulation layer 1. The protective plate pressing sheet 4 is provided with an opening on the upper part of the mounting hole. The electrode column passes through the opening and enters the mounting hole. The protective plate pressing sheet 4 is used to isolate the heater and the insulation layer 1 provided in the single crystal furnace and to press the insulation layer 1 more tightly.

[0040] In this embodiment, the upper surface of the electrode column and the upper surface of the disc protection pressing sheet 4 are in the same plane.

[0041] An electrode foot 6 is provided on the upper part of the electrode column, and the electrode foot 6 provides power for the operation of the single crystal furnace by contacting with the upper surface of the electrode column;

[0042] A first electrode bolt 5 is provided in the electrode foot 6, and the first electrode bolt 5 extends into the upper hole and is fixedly connected to the upper hole. The introduction of the first electrode bolt 5 significantly enhances the connection stability between the electrode foot 6 and the electrode column. Through the tightening effect of the first electrode bolt 5, electrical safety hazards such as leakage or short circuit caused by loosening of the electrode foot 6 can be effectively prevented.

[0043] A copper electrode 8 is provided at the lower part of the electrode column, one end of the copper electrode 8 is connected to the electrode column via a second electrode bolt 7, and the second electrode bolt 7 extends into the lower hole and is fixedly connected to the lower hole;

[0044] The other end of the copper electrode 8 is connected to a copper busbar 9, and the copper electrode 8 is connected to an external power source through the copper busbar 9 to supply power to the single crystal furnace.

[0045] Comparative Example 1

[0046] like Figure 3 As shown, the difference between the prior art and Example 1 is that there is no insulating coating 3 on the side of the main structure, a sheath 11 is provided on the outside of the electrode column, and an insulating material 10 is filled in the gap between the electrode column and the sheath 11, the outside of the sheath 11 is in contact with the thermal insulation layer 1, and the insulating material 10 includes but is not limited to quartz sand, ceramic or glass. Under high temperature conditions, the oxide of the insulating material 10 is easy to react with the electrode column and / or the sheath 11, so that the electrode column, the sheath 11 and the thermal insulation layer 1 are all subject to different degrees of carbon corrosion, the sheath 11 is easily damaged and cracked, and there is heat leakage during use, resulting in energy loss, high cost of use, short service life, and affecting processing efficiency.

[0047] like Figure 3 As shown, in the prior art, the upper surface of the disc guard pressing sheet 4 must also be provided with a groove 401, and the groove 401 is used to accommodate the sleeve 11. However, the disc guard pressing sheet 4 of the utility model does not need to be additionally provided with a groove 401, which reduces the difficulty of processing the disc guard pressing sheet 4 and is more conducive to processing and promotion.

[0048] As for the electrode column with insulating coating 3 of the utility model, as shown in Example 1, the insulating coating 3 is directly fixed on the side of the electrode column body by means of thermal spraying technology, vapor deposition or brushing and sintering, and is completely integrated. Such structural transformation can directly omit the insulating material 10 and the sheath 11 arranged outside the electrode column 2 in the single crystal furnace in the prior art, i.e. the comparative example. No spacing is required between the electrode column and the thermal insulation layer 1, so there is no carbon corrosion damage. The insulating coating 3 is in direct contact with the thermal insulation layer 1, which avoids heat loss of the single crystal furnace, saves energy, better maintains the stability of the internal temperature of the single crystal furnace, reduces the heating time of the single crystal furnace, saves electricity costs, and increases the service life of the single crystal furnace.

[0049] The electrode column structure provided by the utility model can solve the problems of insulation and energy saving. There are nearly 100,000 single crystal furnaces in China. If all of them use the electrode columns provided by the utility model, 300,000 to 700,000 kWh of electricity can be saved per hour, which can save a total of 43 to 100 tons of standard coal.

[0050] The sheath 11 and insulating material 10 used in the prior art in the comparative example need to be replaced every 1.5-2 months on average. During the replacement, the furnace needs to be cooled down and stopped, and the furnace body needs to be opened. An additional 4-8 hours of preparation time is required during the process, which consumes a lot of manpower and material resources. The electrode column with insulating coating 3 provided by the utility model can effectively increase the service life of the electrode and save the cost of use. The electrode column provided by the utility model can save 2,000 yuan in consumables per year for each single crystal furnace, and the labor efficiency is improved by 5%.

[0051] The insulating coating 3 is boron nitride ceramic. Boron nitride has good corrosion resistance and good insulation performance. The use of the insulating layer 1 in direct contact with boron nitride can effectively improve the insulation performance and save furnace space, and the space utilization rate is increased by 3-5%.

[0052] Compared with the prior art in the comparative example, the electrode column provided by the utility model is more convenient to install and replace, and does not require the operation steps of filling quartz sand, ceramic or glass between the sheath and the electrode.

[0053] Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

Claims

1. An electrode column, characterized in that: The electrode column comprises an electrode column body (2) and an insulating coating (3) located outside the electrode column body (2), wherein the insulating coating (3) is fixed on the outside of the electrode column body (2).

2. An electrode column according to claim 1, characterized in that: The electrode column body (2) is in the shape of a column or a cube.

3. An electrode column according to claim 2, characterized in that: An upper hole is provided at the upper part of the electrode column body (2), and a lower hole is provided at the lower part of the electrode column body (2); the upper hole and the lower hole are connected in the middle, and an exhaust hole is provided at the stage of the connection.

4. The electrode column according to claim 1, characterized in that: The thickness of the insulating coating (3) is 1-3 mm.

5. A single crystal furnace, characterized in that: Use the electrode column described in any one of claims 1 to 4.

6. A single crystal furnace according to claim 5, characterized in that: A mounting hole is provided at the bottom of the single crystal furnace, the mounting hole being perpendicular to the bottom surface of the single crystal furnace, and a heat-insulating layer (1) for surrounding the outside of the electrode column is also provided in the mounting hole.

7. A single crystal furnace according to claim 6, characterized in that: A disc protection pressing sheet (4) is provided on the upper part of the thermal insulation layer (1), and an opening is provided on the upper part of the mounting hole of the disc protection pressing sheet (4), and the electrode column passes through the opening and enters the mounting hole.

8. A single crystal furnace according to claim 7, characterized in that: The upper surface of the electrode column and the upper surface of the disc protection pressing sheet (4) are located in the same plane.

9. A single crystal furnace according to claim 8, characterized in that: An electrode foot (6) is provided at the top of the electrode column; a first electrode bolt (5) is provided inside the electrode foot (6); the first electrode bolt (5) extends into the interior of the upper hole and is fixedly connected to the upper hole.

10. A single crystal furnace according to claim 9, characterized in that: A copper electrode (8) is provided at the bottom of the electrode column, one end of the copper electrode (8) is connected to the electrode column via a second electrode bolt (7), the second electrode bolt (7) extends into the lower hole and is fixedly connected to the lower hole; the other end of the copper electrode (8) is connected to a copper busbar (9).

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