Carbon fiber low-temperature furnace structure
By using a stepped backing layer made of aluminum silicate fiber cotton and connected by asbestos rope in a carbon fiber low-temperature furnace, the problems of poor thermal conductivity and shock resistance of rock wool are solved, achieving better insulation and sealing, and improving product quality and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 中复神鹰碳纤维连云港有限公司
- Filing Date
- 2026-03-09
- Publication Date
- 2026-05-12
AI Technical Summary
When rock wool is used as the backing insulation component in existing carbon fiber cryogenic furnaces, there are problems such as high thermal conductivity, poor thermal shock resistance and poor sealing, which lead to heat loss, unstable temperature, and atmospheric fluctuations, affecting product quality.
The backing board layer, made of aluminum silicate fiber cotton, is designed in a stepped shape, staggered and spliced and connected by asbestos rope. Combined with the heating pipe head wrapped in rock wool and the fireproof layer, it forms a stable thermal insulation structure, enhancing earthquake resistance and sealing.
The furnace body's insulation and sealing properties were improved, energy consumption was reduced, equipment lifespan was extended, and the quality and production efficiency of low-temperature carbon fiber treatment were ensured.
Smart Images
Figure CN122013371A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of carbon fiber production technology, and more specifically, to a carbon fiber low-temperature furnace structure. Background Technology
[0002] In the carbon fiber production process, the low-temperature furnace (usually referring to the pre-oxidation furnace or stabilization furnace) is a crucial core piece of equipment. It is used to transform the originally flammable and soluble polyacrylonitrile precursor into high-temperature resistant, non-melting, and non-flammable stabilized fiber through precisely controlled low-temperature heat treatment, laying the foundation for subsequent high-temperature carbonization.
[0003] In the cryogenic furnace process of carbon fiber production, the furnace's heat-locking and sealing performance directly affects production efficiency and product quality. Currently, most carbon fiber cryogenic furnaces use rock wool as the backing insulation component. However, rock wool has significant drawbacks: firstly, its high thermal conductivity leads to easy heat loss from the furnace body, increasing heater energy consumption and making it difficult to maintain stable furnace temperature; secondly, its poor thermal shock resistance makes it prone to cracking and detachment during cryogenic furnace temperature cycling, shortening its service life; and thirdly, inadequate sealing after rock wool installation can cause fluctuations in the furnace atmosphere, affecting the cryogenic treatment effect of carbon fiber tows and potentially leading to substandard product performance.
[0004] Therefore, there is an urgent need for a low-temperature furnace back liner structure that combines heat preservation, earthquake resistance, and sealing effect. Summary of the Invention
[0005] The purpose of this invention is to provide a carbon fiber cryogenic furnace structure that can balance the insulation, shock resistance and sealing effect of the cryogenic furnace, thereby improving product quality.
[0006] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a carbon fiber cryogenic furnace structure, comprising: Furnace body, including furnace body side plates and furnace body cover plate; The insulation layer is disposed on the inner side of the furnace body side plate and the furnace body cover plate. The insulation layer includes multiple backing plate layers stacked in a stepped manner, and the area of the multiple backing plate layers gradually decreases towards the inside of the furnace body. Each backing plate layer includes two backing plates spliced together, and the seams of adjacent backing plate layers are staggered. A fireproof layer is provided on the side of the insulation layer away from the furnace body; Heating elements are disposed inside the furnace body; A connector, disposed on the insulation layer, is used to connect adjacent backing layers.
[0007] In an optional embodiment, the backing board is made of aluminum silicate fiber cotton.
[0008] In an optional embodiment, the fireproof layer is a fireproof board.
[0009] In an optional embodiment, the backing plate has a thickness of 30-50mm, and the width of each stepped platform of the insulation layer is the same as the thickness of the backing plate.
[0010] In an optional embodiment, the connector includes an asbestos rope, and the backing plate has holes for the asbestos rope to pass through.
[0011] In an optional embodiment, the head of the heating tube passes through the insulation layer, and the head of the heating tube is provided with an insulation component.
[0012] In an optional embodiment, the insulation component includes a rock wool wrapping layer, which wraps around the heating pipe head, and the fireproof layer is wrapped around the outside of the rock wool wrapping layer, with the heating pipe head embedded in the backing plate.
[0013] In an optional embodiment, multiple heating tubes are spaced apart.
[0014] The beneficial effects of the carbon fiber cryogenic furnace structure provided in this embodiment of the invention include: By setting insulation layers on the furnace side plates and furnace cover plates, and setting the insulation layers as multi-layer backing plates in a stepped shape, with the two backing plates in each backing plate layer staggered and the multi-layer backing plates connected by connectors, the insulation layer is easy to install and the connection structure is stable, ensuring that the furnace body has good shock resistance and sealing performance. At the same time, the insulation layer can prevent atmospheric fluctuations inside the furnace and ensure the quality of low-temperature carbon fiber treatment. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the carbon fiber cryogenic furnace structure provided in this embodiment from a first-view perspective; Figure 2 This is a schematic diagram of the structure of the insulation layer provided in this embodiment; Figure 3 This is a schematic diagram of the installation structure of the heating element provided in this embodiment.
[0017] Icons: 100-furnace body; 110-furnace body side plate; 120-furnace body cover plate; 200-insulation layer; 210-backing plate layer; 211-backing plate; 300-fireproof layer; 400-heating tube; 410-insulation component; 500-connector. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0021] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0022] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0023] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.
[0024] In the cryogenic furnace process of carbon fiber production, the furnace's heat-locking and sealing performance affects production efficiency and product quality, directly impacting the strength properties of the carbon fiber. Existing cryogenic furnaces for carbon fiber mostly use rock wool as the backing insulation component. However, rock wool has significant drawbacks: firstly, its high thermal conductivity leads to easy heat loss from the furnace body, increasing heater energy consumption and making it difficult to maintain stable furnace temperature; secondly, its poor thermal shock resistance makes it prone to cracking and detachment during cryogenic furnace temperature cycling, shortening its service life; and thirdly, inadequate sealing after rock wool installation can cause fluctuations in the furnace atmosphere, affecting the processing effect of carbon fiber tows in the cryogenic carbonization section, resulting in substandard product performance.
[0025] Therefore, there is an urgent need to develop a backing board that can replace traditional rock wool and has excellent thermal insulation, thermal shock resistance and sealing effect, so as to solve the industry pain points of existing technologies.
[0026] The following detailed description of the overall structure, working principle, and technical effects of the carbon fiber cryogenic furnace structure provided by the present invention, through embodiments and in conjunction with the accompanying drawings, is a practical example.
[0027] Please refer to Figure 1 and Figure 2 This invention provides a carbon fiber cryogenic furnace structure including a furnace body 100, an insulation layer 200, a fireproof layer 300, a heating tube 400, and connectors 500. The furnace body 100 has an overall rectangular structure and includes furnace body side plates 110 and furnace body cover plates 120. The insulation layer 200 is provided on the inner side of both the furnace body side plates 110 and the furnace body cover plates 120. The insulation layer 200 includes multiple backing plate layers 210, which are stacked in a stepped manner, and the area of the multiple backing plate layers 210 gradually decreases towards the interior of the furnace body 100. Further, each backing plate layer 210 includes two backing plates 211 spliced together, so each backing plate layer 210 has a seam, and the seams on adjacent backing plate layers 210 are staggered. Understandably, because the insulation layer 200 is stepped, the insulation layers 200 on adjacent furnace side panels 110 are in close contact with each other. Simultaneously, when the furnace cover plate 120 is installed on the furnace body 100, the insulation layer 200 on the furnace cover plate 120 is also in close contact with the insulation layers 200 on multiple furnace side panels 110, thus achieving a good insulation effect. The fireproof layer 300 is located on the side of the insulation layer 200 away from the furnace body 100, and the heating pipe 400 is located inside the furnace body 100. The connector 500 is located on the insulation layer 200 for connecting adjacent backing plate layers 210.
[0028] By setting insulation layers 200 on the furnace side plates 110 and furnace cover plates 120, and setting the insulation layers 200 as multi-layer backing plates 210 in a stepped shape, with the two backing plates 211 in each backing plate layer 210 being staggered at the joints, and the multi-layer backing plate layers 210 being connected by connectors 500, the insulation layers 200 are easy to install and have a stable connection structure, ensuring that the furnace body 100 has good shock resistance and sealing performance. At the same time, the insulation layers 200 can prevent atmospheric fluctuations inside the furnace body 100, ensuring the quality of low-temperature carbon fiber treatment.
[0029] Please refer to Figure 1 and Figure 2 In some optional embodiments, the backing plate 211 is made of aluminum carbonate fiber cotton as the main raw material, combined with natural refractory materials and organic binders, and the key performance parameters of the backing plate 211 meet the following requirements: thermal conductivity ≤ 0.035 W / (m²) at 200℃. The material has a temperature resistance range of -50℃ to 400℃ and a bulk density of 300kg / m³. Furthermore, the backing plate 211 must be a non-brittle material with a certain degree of toughness, and must not crack or fall off after 50 temperature cycles between 100℃ and 300℃. Therefore, aluminum carbonate fiber cotton material is used for the backing plate 211. The backing plate 211 requires no drying or curing and can be used directly after installation, simplifying the installation process and improving production efficiency. The fireproof layer 300 is a fireproof board made of materials such as ceramic fiberboard to meet the requirements of low-temperature furnace fire resistance, high temperature resistance, thermal conductivity, mechanical properties, and chemical corrosion resistance.
[0030] Please refer to Figure 1 and Figure 2 In some optional embodiments, the thickness of the backing plate 211 is 30mm-50mm, and the width of the platform of each step on the insulation layer 200 is the same as the thickness of the backing plate 211. Thus, when installing the insulation layer 200, the stepped insulation layers 200 on adjacent furnace side panels 110 interlock and tightly abut against each other, improving the structural stability and insulation performance of the furnace body 100. In this embodiment, the thickness of the backing plate 211 is 50mm, and the backing plate layer 210 uses a 600mm thick material. 900 50mm, 600 1200 Two specifications of 50mm aluminum silicate fiber cotton boards are spliced together. In other embodiments, the size of the backing board 211 can be selected according to the design size of the low temperature furnace.
[0031] Please refer to Figure 1 and Figure 2In some alternative embodiments, the connector 500 includes an asbestos rope. Specifically, holes are pre-drilled in the fireproof board for the asbestos rope to pass through. The asbestos rope passes through multiple layers of backing board 210 and is fastened to achieve a sealed connection between the backing board layers 210 and the backing board layers 210, while improving the overall structural strength of the insulation layer 200 and the furnace body 100.
[0032] Please refer to 1 and Figure 3 In some optional embodiments, the heating tube 400 is disposed inside the furnace body 100, and the two ends of the heating tube 400 are respectively inserted into the insulation layer 200 of the side plates 110 of the furnace body on both sides. The ends of the heating tube 400 are provided with insulation components 410 to reduce heat loss and energy consumption. In this embodiment, the insulation component 410 includes a rock wool wrapping layer, which wraps around the ends of the heating tube 400. Furthermore, a fireproof layer 300 is wrapped around the outside of the rock wool wrapping layer, and an aluminum carbonate fiber backing plate 211 of the insulation layer 200 is attached to the outside of the fireproof layer 300. The heating tube 400 structure provided by this invention, compared with the existing rock wool wrapping method, effectively reduces heat loss from the furnace body 100, avoids atmosphere fluctuations inside the furnace, and ensures the quality of carbon fiber cryogenic treatment. Furthermore, by optimizing the insulation structure, it reduces heater energy consumption, and the aluminum silicate backing plate 211 has a longer lifespan than rock wool, thereby reducing the frequency of rock wool replacement, ensuring the quality of carbon fiber cryogenic treatment, and reducing long-term maintenance costs. Further, to improve the processing efficiency of the cryogenic furnace, multiple heating tubes 400 are spaced apart inside the furnace, and to facilitate temperature uniformity within the furnace, the multiple heating tubes 400 are arranged at equal intervals.
[0033] In summary, the implementation principle of the carbon fiber cryogenic furnace structure provided by this machine is as follows: by setting an insulation layer 200 on the furnace body side plate 110 and the furnace body cover plate 120, and setting the insulation layer 200 as a stepped multi-layer backing plate layer 210, the two backing plates 211 in each backing plate layer 210 are staggered, and the multi-layer backing plate layers 210 are connected by connectors 500. The insulation layer 200 is easy to install and the connection structure is stable, ensuring that the furnace body 100 has good shock resistance and sealing performance. At the same time, the insulation layer 200 can prevent atmospheric fluctuations inside the furnace body 100 and ensure the quality of carbon fiber cryogenic treatment.
[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.
Claims
1. A carbon fiber cryogenic furnace structure, characterized in that, include: Furnace body, including furnace body side plates and furnace body cover plate; The insulation layer is disposed on the inner side of the furnace body side plate and the furnace body cover plate. The insulation layer includes multiple backing plate layers stacked in a stepped manner, and the area of the multiple backing plate layers gradually decreases towards the inside of the furnace body. Each backing plate layer includes two backing plates spliced together, and the seams of adjacent backing plate layers are staggered. A fireproof layer is disposed on the side of the insulation layer away from the furnace body; Heating elements are disposed inside the furnace body; A connector, disposed on the insulation layer, is used to connect adjacent backing layers.
2. The carbon fiber cryogenic furnace structure according to claim 1, characterized in that, The backing board is made of aluminum silicate fiber cotton.
3. The carbon fiber cryogenic furnace structure according to claim 1, characterized in that, The fireproof layer is a fireproof board.
4. The carbon fiber cryogenic furnace structure according to claim 1, characterized in that, The thickness of the backing board is 30-50mm, and the width of each step of the insulation layer is the same as the thickness of the backing board.
5. The carbon fiber cryogenic furnace structure according to claim 1, characterized in that, The connector includes an asbestos rope, and the backing plate has holes for the asbestos rope to pass through.
6. The carbon fiber cryogenic furnace structure according to claim 1, characterized in that, The heating tube head is inserted into the insulation layer, and the heating tube head is provided with an insulation component.
7. The carbon fiber cryogenic furnace structure according to claim 6, characterized in that, The insulation component includes a rock wool wrapping layer, which wraps around the heating pipe head. The fireproof layer is wrapped around the rock wool wrapping layer, and the heating pipe head is embedded in the backing plate.
8. The carbon fiber cryogenic furnace structure according to claim 6, characterized in that, The heating tubes are arranged in multiple intervals.