A thermal insulation structure for a graphite crucible calcination tunnel kiln

Abstract

This utility model belongs to the field of tunnel kiln technology, specifically relating to a thermal insulation structure for a graphite crucible calcining tunnel kiln. It includes a refractory brick wall, with a vacuum pipeline thermal insulation system embedded in the top of the refractory brick wall. The vacuum pipeline thermal insulation system comprises multiple horizontally spaced tubes, each penetrating both ends of the refractory brick wall. The outer side of each tube is wrapped with an insulation layer. Blind plates and expansion joints are connected to the ends of the tubes, respectively. The expansion joints connect to the sides of the vacuum tubes, which are equipped with vacuum gauges and connected to the inlet of a vacuum pump. Thermal deformation buffer components are installed between the ends of the tubes and the refractory brick wall. The vacuum pipeline thermal insulation system has a simple structure and is easy to install. It effectively reduces heat loss from the top of the refractory brick wall through vacuum insulation. The expansion joints, thermal deformation buffer components, and insulation layer compensate for deformation when the tubes deform under heat, preventing the expansion displacement of the tubes from damaging the structure of the refractory brick wall and affecting its thermal insulation performance.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel kiln technology, specifically relating to a heat insulation structure for a graphite crucible calcining tunnel kiln. Background Technology

[0002] As a crucial piece of equipment for the large-scale production of graphite crucibles, the thermal insulation performance of the calcining tunnel kiln directly impacts product quality, energy consumption, and production costs. However, current graphite crucible calcining tunnel kilns face the following challenges in terms of thermal insulation:

[0003] Traditional tunnel kilns primarily rely on refractory bricks to construct their kiln structure. While refractory bricks possess a certain degree of high-temperature resistance, their high thermal conductivity means that heat will continuously be conducted outwards through them under prolonged high-temperature conditions. This heat loss is particularly severe at the top of the kiln due to the lack of effective insulation. This significant heat loss not only wastes energy and increases production costs but also results in uneven temperature distribution within the kiln, affecting the firing quality of graphite crucibles and leading to defects such as cracking and deformation, ultimately reducing product yield.

[0004] Existing insulation improvements typically increase the thickness of refractory bricks to enhance insulation performance. However, this approach not only increases the construction cost and weight of the kiln but also occupies more space, affecting the effective volume and material flow within the kiln. Some companies use filling insulation materials, but traditional insulation materials are prone to aging and shrinkage at high temperatures, leading to a gradual decrease in insulation performance. Furthermore, existing insulation structures often fail to adequately consider the thermal deformation during kiln operation during design, resulting in ineffective deformation compensation and further weakening the insulation effect and the stability of the kiln structure. Utility Model Content

[0005] To address the above problems, the purpose of this utility model is to provide a thermal insulation structure for a graphite crucible roasting tunnel kiln, thereby solving the problem that traditional graphite crucible roasting tunnel kilns suffer from severe heat loss and that thermal stress can damage the kiln structure when using a composite insulation structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a thermal insulation structure for a graphite crucible calcining tunnel kiln, comprising a refractory brick wall, a vacuum pipeline thermal insulation system embedded in the top of the refractory brick wall, the vacuum pipeline thermal insulation system comprising multiple horizontally spaced transverse pipes, the two ends of the transverse pipes penetrating both sides of the refractory brick wall, the outer side of the transverse pipes being wrapped with a thermal insulation layer, the two ends of the transverse pipes being connected to a blind plate and an expansion joint respectively, the expansion joints being connected to the side of a vacuum tube, a vacuum gauge being installed on the vacuum tube, the vacuum tube being connected to the air inlet of a vacuum pump, and a thermal deformation buffer assembly being provided between the two ends of the transverse pipes and the refractory brick wall.

[0007] The beneficial effects of this utility model are as follows: the vacuum pipeline heat insulation system has a simple structure and is easy to install. It can effectively reduce the heat loss at the top of the refractory brick wall through vacuum heat insulation. The expansion joint, heat deformation buffer component and heat insulation layer can achieve the purpose of deformation compensation when the horizontal pipe is deformed by heat, so as to avoid the horizontal pipe from damaging the structure of the refractory brick wall and affecting the heat insulation performance of the refractory brick wall due to expansion displacement.

[0008] In order to effectively reduce the damage to the refractory brick wall when the horizontal tube expands in the radial direction;

[0009] As a further improvement to the above technical solution: the difference between the outer diameter of the horizontal tube and the inner diameter of the through hole for inserting the horizontal tube in the refractory brick wall is not less than 10mm.

[0010] The beneficial effects of this improvement are as follows: when the horizontal tube expands due to heat, it compresses the insulation layer, causing the insulation layer to undergo elastic deformation. Meanwhile, the gap between the horizontal tube and the refractory brick wall is used to fill the insulation layer, while preventing the horizontal tube from directly compressing the refractory brick wall after expansion, thus avoiding structural damage to the refractory brick wall.

[0011] To further improve the thermal insulation performance of the horizontal tubes;

[0012] As a further improvement to the above technical solution: the insulation layer is an aluminum silicate fiber blanket, which is rolled into a cylindrical shape and wrapped around the outside of the horizontal tube.

[0013] The beneficial effects of this improvement are: the use of an insulation layer can effectively improve the insulation performance of the horizontal pipe.

[0014] To ensure a secure connection between the horizontal pipe and the blind flange and expansion joint;

[0015] As a further improvement to the above technical solution: flanges are welded to both ends of the horizontal pipe, and the flanges at both ends of the horizontal pipe are connected to blind plates and expansion joints respectively by bolts.

[0016] The beneficial effects of this improvement are: the bolt and flange connection method allows for a stable connection between the horizontal pipe and the blind plate and expansion joint.

[0017] In order to effectively reduce the heat loss caused by the axial expansion of the horizontal tube after heating by using a heat deformation buffer assembly;

[0018] As a further improvement to the above technical solution: the heat deformation buffer assembly includes a spring and a heat insulation plate. The spring and the heat insulation plate are slidably fitted on the outside of the horizontal tube. The heat insulation plate is located between the spring and the side of the refractory brick wall, and the spring is located between the heat insulation plate and the flange.

[0019] The beneficial effects of this improvement are: the inner diameter of the spring and the heat insulation plate should not be less than the diameter of the horizontal tube after expansion, so that after the horizontal tube expands due to heat, the heat insulation plate is pressed tightly against the side of the refractory brick wall under the elastic support of the spring, thus preventing heat from being lost through the through holes opened at the top of the refractory brick wall.

[0020] To ensure the insulation board effectively seals the holes in the refractory brick wall;

[0021] As a further improvement to the above technical solution: the spring is a corrugated spring.

[0022] The beneficial effects of this improvement are: the corrugated spring can provide greater elastic force in a limited space and the force is evenly distributed, which can make the heat insulation board press flatly against the side of the firebrick wall.

[0023] To effectively ensure the installation stability of the vacuum tube;

[0024] As a further improvement to the above technical solution: the vacuum tube is installed on a support frame, and the support frame is fixed to the side of the refractory brick wall by bolts.

[0025] The beneficial effect of this improvement is that the vacuum tube can be stably supported by the support frame, thereby ensuring a secure connection between the expansion joint and the vacuum unit.

[0026] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of this utility model;

[0029] Figure 3 This is a schematic diagram of the vacuum pipeline heat insulation system in this utility model;

[0030] Figure 4 This is an enlarged view of A in this utility model;

[0031] In the diagram: 1. Refractory brick wall; 2. Vacuum pipeline insulation system; 3. Support frame; 4. Vacuum gauge; 5. Horizontal pipe; 6. Insulation layer; 7. Heat deformation buffer assembly; 71. Spring; 72. Insulation board; 8. Expansion joint; 9. Vacuum tube; 10. Flange; 11. Blind flange. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0033] Example 1:

[0034] like Figure 1 As shown in Figure 4: A thermal insulation structure for a graphite crucible calcining tunnel kiln includes a refractory brick wall 1. A vacuum pipeline thermal insulation system 2 is embedded in the top of the refractory brick wall 1. The vacuum pipeline thermal insulation system 2 includes multiple horizontally spaced transverse pipes 5. Both ends of each transverse pipe 5 extend through both sides of the refractory brick wall 1. An insulation layer 6 is wrapped around the outside of each transverse pipe 5. Blind plates 11 and expansion joints 8 are connected to both ends of each transverse pipe 5, respectively. The expansion joints 8 are connected to the side of a vacuum tube 9. A vacuum gauge 4 is installed on the vacuum tube 9. The vacuum tube 9 is connected to the inlet of a vacuum pump. Thermal deformation buffer components 7 are provided between both ends of the transverse pipe 5 and the refractory brick wall 1. The vacuum pipeline thermal insulation system 2 has a simple structure and is easy to install. Vacuum insulation effectively reduces heat loss from the top of the refractory brick wall 1. The expansion joint 8, thermal deformation buffer assembly 7, and insulation layer 6 compensate for deformation when the horizontal tube 5 deforms due to heat, preventing the horizontal tube 5 from damaging the structure of the refractory brick wall 1 and affecting its insulation performance. The difference between the outer diameter of the horizontal tube 5 and the inner diameter of the through hole for inserting the horizontal tube 5 in the refractory brick wall 1 is not less than 10mm. When the horizontal tube 5 expands due to heat, it compresses the insulation layer 6, causing it to elastically deform. The gap between the horizontal tube 5 and the refractory brick wall 1 is used to fill the insulation layer 6 while preventing the horizontal tube 5 from directly compressing the refractory brick wall 1 after expansion, thus avoiding structural damage. The insulation layer 6 is an aluminum silicate fiber blanket, which is rolled into a cylindrical shape and wrapped around the outside of the horizontal pipe 5. The use of the insulation layer 6 can effectively improve the insulation performance of the horizontal pipe 5. Flanges 10 are welded to both ends of the horizontal pipe 5. The flanges 10 at both ends of the horizontal pipe 5 are connected to the blind plate 11 and the expansion joint 8 by bolts. The bolt and flange connection method can stably connect the blind plate 11 and the expansion joint 8 of the horizontal pipe 5. The heat deformation buffer assembly 7 includes a spring 71 and a heat insulation plate 72. The spring 71 and the heat insulation plate 72 are slidably fitted on the outside of the horizontal pipe 5. The heat insulation plate 72 is located between the spring 71 and the side of the refractory brick wall 1. The spring 71 is located between the heat insulation plate 72 and the flange. Between the discs 10, the inner diameter of the spring 71 and the heat insulation plate 72 should not be less than the diameter of the horizontal tube 5 after expansion. This ensures that after the horizontal tube 5 expands due to heat, the heat insulation plate 72 is pressed tightly against the side of the refractory brick wall 1 under the elastic support of the spring 71, preventing heat loss from the through holes opened at the top of the refractory brick wall 1. The spring 71 is a corrugated spring, which can provide greater elastic force in a limited space and distribute the force evenly, allowing the heat insulation plate 72 to be pressed flat against the side of the refractory brick wall 1. The vacuum tube 9 is installed on the support frame 3, which is fixed to the side of the refractory brick wall 1 by bolts. The vacuum tube 9 can be stably supported by the support frame 3, thereby securely connecting the expansion joint 8 and the vacuum unit for use.

[0035] The working principle of this technical solution is as follows: The vacuum unit is started, and the inside of the horizontal tube 5 is evacuated through the vacuum tube 9. The value of the vacuum gauge 4 is observed. When the vacuum degree reaches the set value, the vacuum unit is turned off, so that the inside of the horizontal tube 5 is kept in a vacuum state. When the tunnel kiln starts the firing operation, the temperature inside the kiln gradually rises. The heat from the top of the refractory brick wall 1 will be transferred to the horizontal tube 5. Since the inside of the horizontal tube 5 is in a vacuum state, the vacuum insulation characteristic can effectively prevent heat from being conducted through the horizontal tube 5, thereby reducing the heat loss from the top of the refractory brick wall 1. As the temperature continues to rise, the horizontal tube 5 expands due to heat. At this time, the insulation layer 6 will undergo elastic deformation due to the compression of the horizontal tube 5. The gap reserved between the horizontal tube 5 and the refractory brick wall 1 can prevent the horizontal tube 5 from directly compressing the refractory brick wall 1, thus protecting the wall structure. At the same time, when the horizontal tube 5 expands axially, it will push the spring 71 to compress. The heat insulation plate 72 is always pressed tightly against the side of the refractory brick wall 1 under the elastic support of the spring 71, preventing heat from being lost from the through hole, thus achieving thermal deformation compensation and efficient heat insulation.

[0036] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A heat insulation structure for a graphite crucible calcination tunnel kiln, characterized in that: The system includes a refractory brick wall (1), and a vacuum pipeline insulation system (2) is embedded on the top of the refractory brick wall (1). The vacuum pipeline insulation system (2) includes multiple horizontally spaced horizontal pipes (5). The two ends of the horizontal pipes (5) pass through both sides of the refractory brick wall (1). The outer side of the horizontal pipes (5) is wrapped with an insulation layer (6). The two ends of the horizontal pipes (5) are respectively connected to a blind plate (11) and an expansion joint (8). The expansion joint (8) is connected to the side of a vacuum tube (9). A vacuum gauge (4) is installed on the vacuum tube (9). The vacuum tube (9) is connected to the air inlet of a vacuum pump. A heat deformation buffer assembly (7) is provided between the two ends of the horizontal pipes (5) and the refractory brick wall (1).

2. The insulation structure of a graphite crucible calcination tunnel kiln according to claim 1, characterized in that: The difference between the outer diameter of the horizontal tube (5) and the inner diameter of the through hole for inserting the horizontal tube (5) on the firebrick wall (1) is not less than 10 mm.

3. The insulation structure of a graphite crucible calcination tunnel kiln according to claim 1, characterized in that: The insulation layer (6) is an aluminum silicate fiber blanket, which is rolled into a cylindrical shape and wrapped around the outside of the horizontal tube (5).

4. The insulation structure of a graphite crucible calcination tunnel kiln according to claim 1, characterized in that: Flanges (10) are welded to both ends of the horizontal pipe (5). The flanges (10) at both ends of the horizontal pipe (5) are connected to the blind plate (11) and the expansion joint (8) respectively by bolts.

5. The insulation structure of a graphite crucible calcination tunnel kiln according to claim 1, characterized in that: The heat deformation buffer assembly (7) includes a spring (71) and a heat insulation plate (72). The spring (71) and the heat insulation plate (72) are slidably fitted on the outside of the horizontal tube (5). The heat insulation plate (72) is located between the spring (71) and the side of the firebrick wall (1). The spring (71) is located between the heat insulation plate (72) and the flange (10).

6. The insulation structure of a graphite crucible calcination tunnel kiln according to claim 5, characterized in that: The spring (71) is a corrugated spring.

7. The insulation structure of a graphite crucible calcination tunnel kiln according to claim 1, characterized in that: The vacuum tube (9) is mounted on the support frame (3), which is fixed to the side of the refractory brick wall (1) by bolts.

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