Combined tail cover structure

Abstract

The utility model discloses a combined tail cover structure, which belongs to the technical field of sealing structures and comprises a first hard refractory material, a second hard refractory material and a third hard refractory material, the first hard refractory material is provided with a first end and a second end which are oppositely arranged, and the first end extends into an outer furnace tube and is used for blocking a gap between the outer furnace tube and an inner furnace tube and fixing the first hard refractory material on the outer furnace tube; the soft refractory material seals the port of the second end; and a second hard refractory material. According to the technical scheme, the combined tail cover structure is adopted, the thermal expansion coefficient is reduced, the cracking risk is reduced, and heat radiation leakage is prevented.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of sealing structure, specifically relates to a combined tail cover structure. BACKGROUND

[0002] In photovoltaic technology, the outer furnace tube provides a stable high-temperature environment for the manufacture of photovoltaic devices, enabling a variety of key process steps, including deposition, annealing, diffusion, and oxidation.

[0003] The outer furnace tube includes an outer furnace tube, an inner furnace tube disposed within the outer furnace tube, and a tail cover provided at the end of the inner furnace tube.

[0004] In the prior art, a whole piece of hard refractory material is usually used to cover the tail cover and the gap between the tail cover and the outer furnace tube to achieve heat preservation and sealing, or a fiber blanket is used to fill the gap between the tail cover and the outer furnace tube to achieve sealing.

[0005] A furnace tail sealing device and a hot furnace are disclosed in WO2024255709A1, which is used to seal the tail of a furnace body. The furnace tail sealing device includes a flange mounting plate, a furnace tail flange, and a tail cover. The flange mounting plate and the furnace tail flange are both used to fix and install the tail cover at the furnace tail, and only a single structure of the tail cover is used to seal the furnace tail. However, the thermal expansion coefficient of the single piece of refractory material is high, and the possibility of cracking increases. SUMMARY

[0006] The utility model provides a combined tail cover structure to solve the problem of easy expansion and cracking of the single structure.

[0007] To solve the above technical problems, the technical scheme of the utility model is as follows: a combined tail cover structure is used to seal the tail of a furnace body. The furnace body includes an outer furnace tube and an inner furnace tube that are mutually sleeved. The tail of the inner furnace tube is a hemispherical shell and is provided with a gas pipe that passes through the combined tail cover structure. The combined tail cover structure includes a first hard refractory material having a first end and a second end arranged oppositely. The first end extends into the outer furnace tube to block the gap between the outer furnace tube and the inner furnace tube.

[0008] A soft refractory material seals the second end port.

[0009] A second hard refractory material is fixed at the second end. The soft refractory material is arranged between the second hard refractory material and the hemispherical shell and deforms to fit the surface of the hemispherical shell after being extruded by the hemispherical shell.

[0010] The combined tail cover structure can be assembled at the tail of the furnace body, and the two are fixed relative to each other after assembly.

[0011] Specifically, the second hard refractory material has a cavity, and the soft refractory material deforms to tightly adhere to the inner wall of the cavity.

[0012] Specifically, the soft refractory is a fiber blanket.

[0013] Specifically, the second hard refractory is fixed at the second end by the first sheet metal part and the second sheet metal part.

[0014] Specifically, the first sheet metal part is a ring body fixedly connected with the first hard refractory, and the second sheet metal part is a disc body fixed at the center of the ring body, and the disc body is used for accommodating the second hard refractory.

[0015] Specifically, the first end is embedded between the hemispherical shell and the outer furnace tube.

[0016] Compared with the prior art, the technical scheme of the utility model has the following advantages:

[0017] 1. The combination structure reduces the thermal expansion coefficient of the single refractory, thereby reducing the risk of cracking of the refractory and preventing heat radiation leakage; and when the local size is changed, only the local part needs to be replaced and installed, thereby effectively reducing the structural cost.

[0018] 2. The combination structure is distributed inside and outside in space, so that even if the single refractory locally cracks, the internal heat radiation can also be prevented from penetrating the refractory and leaking outside.

[0019] 3. The combination structure uses soft and hard refractories to cooperate with each other, optimizes the tightness between the refractories, compensates for the tolerance, ensures the sealing property of the structure, and further prevents heat radiation leakage. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the assembly drawing of the combined tail cover structure in the utility model;

[0021] Figure 2 is the axial sectional view of the combined tail cover structure in the utility model;

[0022] Figure 3 is the exploded view of the combined tail cover structure in the utility model;

[0023] Figure 4 is another exploded view of the combined tail cover structure in the utility model.

[0024] Figure 1 shown in the figure: 10, combined tail cover structure; 20, outer furnace tube; 30, inner furnace tube; 31, hemispherical shell; 32, gas pipe;

[0025] Figures 2 to 4 shown in the figure: 40, first hard refractory; 41, first end; 42, second end; 50, soft refractory; 60, second hard refractory; 70, first sheet metal part; 80, second sheet metal part. DETAILED DESCRIPTION

[0026] For the convenience of understanding, the combined tail cover structure is described below in combination with the embodiments, and it should be understood that the embodiments are only used to illustrate the utility model and not to limit the scope of the utility model.

[0027] In the description of the utility model, it should be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation and position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] As shown in Figure 1 and Figure 2 In the embodiment, the combined tail cover structure 10 is used to seal the tail of the furnace body, the furnace body includes an outer furnace tube 20 and an inner furnace tube 30, the outer furnace tube 20 is sleeved outside the inner furnace tube 30, and the end of the outer furnace tube 20 is an opening, the tail of the inner furnace tube 30 is a hemispherical shell 31, the hemispherical shell 31 extends out of the end opening of the outer furnace tube 20, and a gas pipe 32 that can pass through the combined tail cover structure 10 is arranged on the hemispherical shell 31, the gas pipe 32 is used to communicate the outside of the furnace body and the inside of the furnace body.

[0030] The furnace body can be a diffusion furnace, or other types of high-temperature furnaces used in the process of processing and manufacturing photovoltaic cells, such as sintering furnaces, high-temperature furnaces, low-temperature furnaces, LPCVD reaction furnaces, PECVD reaction furnaces, oxidation furnaces and boron diffusion furnaces.

[0031] The inner furnace tube 30 can be made of quartz material.

[0032] As shown in Figure 1 and Figure 4As shown, the combined tail cover structure includes a first hard refractory 40, a soft refractory 50, a second hard refractory 60, a first sheet metal part 70 and a second sheet metal part 80. The first hard refractory 40 is cylindrical and is sleeved on the outside of the inner furnace tube 30. It has a first end 41 and a second end 42 arranged oppositely. The second end 42 is located outside the outer furnace tube 20, and the first end 41 extends into the outer furnace tube 20 along the axis direction of the outer furnace tube 20, blocking the gap between the outer furnace tube 20 and the inner furnace tube 30 and fixing itself on the outer furnace tube 20. Specifically, the first end 41 is inserted between the hemispherical shell 31 and the outer furnace tube 20,

[0033] The first hard refractory 40 can be fixed on the outer furnace tube 20 by interference fit, adhesion, welding, riveting, threaded connection, key connection, pin connection or other connection methods, which are not limited in the present application.

[0034] As shown in Figure 2 and Figure 4 , the first sheet metal part 70 and the second sheet metal part 80 are made of stainless steel. The first sheet metal part 70 is a ring body fixedly connected to the first hard refractory 40, and the second sheet metal part 80 is a disc body fixedly connected to the center of the ring body, which is used to accommodate the second hard refractory 50.

[0035] As shown in Figure 2 and Figure 4 , the soft refractory 50 is a circular sheet body which seals the second end 42 port, specifically, it is inserted into the second end 42 port. The first sheet metal part 70, the second sheet metal part 80 and the soft refractory 50 are all provided with through holes for the gas pipe to pass through.

[0036] The soft refractory 50 is made of a fiber blanket material with elasticity. It is arranged between the second hard refractory 60 and the hemispherical shell 31 and deforms to fit the surface of the hemispherical shell 31 after being extruded by the hemispherical shell 31. The side of the second hard refractory 60 facing the hemispherical shell 31 is concave to form a cavity, and the shape of the cavity is consistent with that of the hemispherical shell 31. The soft refractory 50 is tightly attached to the inner wall of the cavity, promoting the close fit between the first hard refractory 40 and the second hard refractory 60, and assisting the sheet metal part to firmly combine the combined tail cover structure as a whole.

[0037] In summary, the first hard refractory 40, the soft refractory 50, the second hard refractory 60, the first sheet metal part 70 and the second sheet metal part 80 constitute a combined structure. The soft refractory 50 cooperates with the hard refractory, and the soft refractory 50 is distributed inside and outside in space between the first hard refractory 40 and the second hard refractory 60. The thermal expansion coefficient of the single refractory is reduced, and the risk of cracking of the refractory is reduced. Even if a single refractory locally cracks, the gap can be compensated by mutual extrusion and superposition between structures, preventing internal heat radiation from leaking outside through the refractory.

[0038] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part or all of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A combined end closure structure for sealing the end of a furnace, the furnace comprising an outer furnace tube and an inner furnace tube which are nested one within the other, the end of the inner furnace tube being in the form of a hemispherical shell and being provided with a gas duct which passes through the combined end closure structure, characterised in that, The combined tail cover structure comprises a first hard refractory material having oppositely arranged first and second ends, the first end extending into the outer furnace tube for plugging the gap between the outer furnace tube and the inner furnace tube; a soft refractory material sealing the second end port; and a second hard refractory material fixed at the second end, the soft refractory material being arranged between the second hard refractory material and the hemispherical shell and deformed to fit the surface of the hemispherical shell after being pressed by the hemispherical shell.

2. The modular tail cover structure of claim 1, wherein, The second hard refractory material has a cavity, and the deformed soft refractory material tightly adheres to the inner wall of the cavity.

3. The modular tail cover structure of claim 1, wherein, The soft refractory material is a fiber blanket.

4. The modular tail cover structure of claim 1, wherein, The second hard refractory material is fixed at the second end by a first sheet metal part and a second sheet metal part.

5. The modular tail cover structure of claim 4, wherein, The first sheet metal part is a ring body fixedly connected to the first hard refractory material, and the second sheet metal part is a disc body fixed at the center of the ring body, the disc body being used for accommodating the second hard refractory material.

6. The modular tail cover structure of claim 1, wherein, The first end is embedded between the hemispherical shell and the outer furnace tube.

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