Thin wire hearth of TOPCon battery boron expanding machine

Abstract

The utility model discloses a TOPCon battery boron expanding machine filament hearth which comprises an outer round shell and heat preservation asbestos arranged in the outer round shell, a hollow cavity for containing a heating element is formed in the heat preservation asbestos, the heating element comprises a heating furnace wire spirally wound in the hollow cavity, and a plurality of sets of insulation fixing terminal strips are arranged on the peripheral face of the heating furnace wire. The heating furnace wire is simple in structure, adapts to a new diameter size by reducing the diameter of an existing heating furnace wire and increasing the number of windings of a heating furnace wire coil, and can effectively reduce total heat generated by the heating wire in unit length by reducing the diameter of the heating furnace wire and correspondingly increasing the length of the heating furnace wire in the hearth temperature changing process. In addition, by increasing the arrangement density of the insulation fixing terminals in the hearth, the resistance of the structure to the thermal deformation stress of the metal heating furnace wire can be enhanced, and abnormal shutdown events caused by deformation of the heating furnace wire are further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of solar photovoltaic cell production and manufacturing, in particular to a TOPCon cell boron expansion machine filament furnace. Background Art

[0002] In the high-temperature process of solar photovoltaic cell manufacturing, the filament furnace is a key heating device that adjusts the heating temperature by controlling the current. It is widely used in manufacturing industries that require long-term high-temperature heating, such as the solar cell industry and the semiconductor production industry.

[0003] Currently, the furnace configuration commonly used in the industry uses a heating wire with a diameter of 8mm or larger, equipped with 17 rows of insulated fixed terminals. During the diffusion process, silicon wafers and boron doping sources are placed in the diffusion furnace and heated to a process temperature of approximately 1100°C. At this time, the furnace wire temperature can reach 1500°C and remain there for a period of time. However, this configuration has many problems:

[0004] Due to long-term high-temperature heating, the existing furnace filament is easily melted due to overheating and loses its heating function, which not only affects production efficiency but also increases maintenance costs. In addition, long-term high-temperature operation causes the furnace filament to deform, bend and squeeze the internal quartz furnace tube, which in turn causes the quartz furnace tube to rupture or deteriorate in sealing, resulting in gas leakage, seriously affecting the normal progress of process production. At the same time, the average life of the furnace is only about 12 months, far lower than the expected 18 months. Frequent furnace replacement not only consumes a lot of manpower and time, but each replacement usually requires 6-8 people to work for 8 hours, seriously affecting the normal production process and leading to increased costs. To address the above problems, a new TOPCon battery boron expansion machine filament furnace is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a TOPCon battery boron expansion machine filament furnace to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a TOPCon battery boron expander filament furnace, comprising an outer cylindrical shell and thermal insulation asbestos arranged inside the outer cylindrical shell, a hollow cavity for accommodating a heating element formed inside the thermal insulation asbestos, the heating element comprising a heating wire spirally coiled in the hollow cavity, the outer peripheral surface of the heating wire being provided with a plurality of groups of insulating fixed terminal blocks, which are configured to enable it to better resist the thermal deformation stress of the metal heating wire.

[0007] As a further solution of the present invention: the thermal insulation asbestos includes an outer asbestos layer that adheres to the inner wall of the outer circular shell and an inner asbestos layer adjacent to the middle of the outer circular shell cavity. The heating element is located between the outer asbestos layer and the inner asbestos layer. The surface of the inner asbestos layer is provided with multiple groups of through grooves connecting the hollow cavity and the inner cavity of the outer circular shell.

[0008] As a further solution of the present invention: a power supply terminal is installed on the outer circumferential surface of the outer circular shell, the end of the power supply terminal extends into the interior of the outer circular shell, and the outer asbestos layer is provided between the end of the power supply terminal and the inner wall of the outer circular shell.

[0009] As a further solution of the present invention: the plurality of groups of insulating fixed terminal blocks are longitudinally arranged on the heating furnace wire, and the spacing between every two connected insulating fixed terminal blocks in the plurality of groups of insulating fixed terminal blocks is equal.

[0010] As a further solution of the present invention: the outer cylindrical shell is made of metal.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The present application reduces the diameter of the existing heating furnace wire and increases the number of windings of the heating furnace wire coil to adapt to the new diameter size. During the process of furnace temperature changes, the total heat generated by the heating wire per unit length is effectively reduced by reducing the diameter of the heating furnace wire and increasing its length accordingly, thereby effectively alleviating the problem of melting caused by overheating of the heating wire. In addition, by increasing the arrangement density of the insulating fixed terminals inside the furnace, the structure's resistance to the thermal deformation stress of the metal heating furnace wire can be enhanced, further reducing abnormal shutdown events caused by deformation of the heating furnace wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the furnace structure of the present utility model;

[0014] Figure 2 This is a schematic diagram of the heating element structure of the present utility model;

[0015] Figure 3 This is a schematic cross-sectional view of the furnace structure of the present invention;

[0016] Figure 4 This is a schematic diagram of the power supply terminal of the present utility model;

[0017] In the figure: 1. Outer circular shell; 2. Insulating asbestos; 21. Outer asbestos layer; 22. Inner asbestos layer; 23. Through groove; 3. Hollow cavity; 4. Heating wire; 5. Insulated fixed terminal block; 6. Power supply terminal. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-4 In an embodiment of the present invention, a TOPCon battery boron expander filament furnace comprises an outer cylindrical shell 1 and thermal insulation asbestos 2 arranged inside the outer cylindrical shell 1. The outer cylindrical shell 1 is made of metal. A hollow cavity 3 for accommodating a heating element is formed in the thermal insulation asbestos 2. The heating element comprises a heating furnace wire 4 spirally wound in the hollow cavity 3. The outer peripheral surface of the heating furnace wire 4 is provided with multiple groups of insulating fixed terminal blocks 5. The multiple groups of insulating fixed terminal blocks 5 are all longitudinally arranged on the heating furnace wire 4, and the spacing between each two connected insulating fixed terminal blocks 5 is equal, and is configured to better resist the thermal deformation stress of the metal heating wire.

[0020] Specifically, the existing heating furnace wire 4 with a diameter of 8 mm is changed to a heating furnace wire with a diameter of 6.5 mm, so that the requirements for the coil winding arrangement of the heating furnace wire 4 are appropriately increased. Secondly, under the action of multiple sets of insulating fixed terminal blocks 5, during the heating and cooling process of the furnace, the total heat of the heating wire per unit length is reduced by reducing the diameter of the heating furnace wire 4 and increasing its length, which can effectively improve the situation of the heating wire fusing;

[0021] Secondly, by increasing the number of arrangements of the insulating fixed terminals 5 inside the furnace, it can better resist the thermal deformation stress of the metal heating furnace wire 4, and can effectively improve the losses caused by abnormal shutdown due to deformation of the heating furnace wire 4, and the spiral winding method can increase the length of the heating furnace wire 4 as much as possible.

[0022] See also Figure 1-4In one embodiment, in this embodiment, preferably, the thermal insulation asbestos 2 includes an outer asbestos layer 21 that fits the inner wall of the outer circular shell 1 and an inner asbestos layer 22 adjacent to the middle of the cavity of the outer circular shell 1. The heating element is located between the outer asbestos layer 21 and the inner asbestos layer 22. The surface of the inner asbestos layer 22 is provided with multiple groups of through grooves 23 that connect the hollow cavity 3 and the inner cavity of the outer circular shell 1. The design of the through grooves 23 allows the heat generated by the heating element to be efficiently transferred to the internal space of the outer circular shell 1 through these slots, ensuring the uniformity and effectiveness of the heating process, improving the heating efficiency, and reducing energy waste. The design of the double-layer asbestos plus the setting of the through grooves 23 not only improves the heat transfer efficiency, but also enhances the structural stability of the entire heating device. Layer 22 and the outer asbestos layer 21 work together to provide stable support for the heating element, reduce mechanical stress caused by temperature changes, and extend the service life of the equipment; the outer peripheral surface of the outer cylindrical shell 1 is installed with a power supply terminal 6, and the end of the power supply terminal 6 extends to the interior of the outer cylindrical shell 1, and an outer asbestos layer 21 is provided between the end of the power supply terminal 6 and the inner wall of the outer cylindrical shell 1. In addition, the outer asbestos layer 21 not only plays a role in thermal insulation, but also serves as an important electrical isolation layer, isolating the direct contact between the power supply terminal 6 and the inner wall of the outer cylindrical shell 1. This design effectively prevents current from being conducted from the power supply terminal 6 to the outer cylindrical shell 1, avoiding possible electric shock hazards or short-circuit accidents, and enhancing the safety of the equipment.

[0023] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0024] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent modifications made according to the scope of the claims of the present application are within the scope of protection of the claims of the present application.

Claims

1. A TOPCon battery boron expansion machine filament furnace, characterized in that: The invention comprises an outer circular shell (1) and thermal insulation asbestos (2) arranged inside the outer circular shell (1); a hollow cavity (3) for accommodating a heating element is formed in the thermal insulation asbestos (2); the heating element comprises a heating wire (4) spirally wound in the hollow cavity (3); the outer peripheral surface of the heating wire (4) is provided with a plurality of groups of insulating fixed terminal blocks (5), which are configured to better resist the thermal deformation of the metal heating wire.

2. The filament furnace of the TOPCon battery boron expansion machine according to claim 1, characterized in that: The thermal insulation asbestos (2) comprises an outer asbestos layer (21) attached to the inner wall of the outer circular shell (1) and an inner asbestos layer (22) adjacent to the middle of the cavity of the outer circular shell (1); the heating element is located between the outer asbestos layer (21) and the inner asbestos layer (22); and the surface of the inner asbestos layer (22) is provided with a plurality of through grooves (23) connecting the hollow cavity (3) and the inner cavity of the outer circular shell (1).

3. The filament furnace of the TOPCon battery boron expansion machine according to claim 2, characterized in that: A power supply terminal (6) is installed on the outer peripheral surface of the outer circular shell (1), the end of the power supply terminal (6) extends into the interior of the outer circular shell (1), and the outer asbestos layer (21) is provided between the end of the power supply terminal (6) and the inner wall of the outer circular shell (1).

4. The filament furnace of the TOPCon battery boron expansion machine according to claim 1, characterized in that: The plurality of groups of insulating fixed terminal rows (5) are all longitudinally arranged on the heating furnace wire (4), and the spacing between every two connected insulating fixed terminal rows (5) of the plurality of groups of insulating fixed terminal rows (5) is equal.

5. The filament furnace of the TOPCon battery boron expansion machine according to claim 1, characterized in that: The outer cylindrical shell (1) is made of metal.

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