A new type of flexible joint for steam calciner
By employing a composite structure of double-layer high-temperature resistant composite rubber and three-layer special fiber cloth reinforcement in the flexible section of the steam calcining furnace, combined with 316L stainless steel mesh, the sealing failure and corrosion problems of traditional flexible sections are solved, achieving reliable sealing and long service life under high-temperature environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN SANHUAN SPECIAL RUBBER CO LTD
- Filing Date
- 2025-09-19
- Publication Date
- 2026-08-04
AI Technical Summary
Traditional steam calcining furnaces lack effective reinforcing layers in their flexible sections, making them prone to excessive stretching or compression that can lead to structural failure. Furthermore, their poor high-temperature and corrosion resistance can result in sealing failure and aging damage.
The composite structure employs a double-layer high-temperature resistant composite rubber layer and a three-layer special fiber cloth reinforcement support layer, combined with 316L stainless steel mesh, to form a high-temperature resistant and corrosion-resistant sealing barrier. The interlayer bonding is enhanced through silane coupling agent treatment and pressure curing.
It improves the tensile and tear resistance of flexible joints, ensures sealing reliability, avoids alkali leakage and dust generation, extends service life, adapts to complex working conditions, and ensures production efficiency and environmental safety.
Smart Images
Figure CN224592690U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steam calcining furnace sealing technology, and in particular to a novel flexible joint for steam calcining furnaces. Background Technology
[0002] The flexible joint of the steam calcining furnace is a key component in the furnace head sealing device, mainly used for sealing and compensating high-temperature steam pipeline systems.
[0003] In the soda ash production process, the steam calciner is a key piece of equipment. The sealing effect of its furnace head directly affects production efficiency, product quality, and the on-site environment. However, the flexible joints of the traditional steam calciner furnace head seals are mostly rubber structures with no reinforcing layer or double aramid reinforcing layer. Lacking an effective reinforcing layer, they are prone to structural failure due to excessive stretching or compression when the furnace body moves up and down or the pressure fluctuates, such as rubber tearing and reinforcing layer damage, which further aggravates the sealing failure. In addition, the temperature in the furnace head area is high when the steam calciner is running, and there are corrosive media such as acidic gases and sulfides inside the furnace. The traditional flexible joints with no reinforcing layer or double aramid reinforcing layer have poor high temperature resistance, poor strength, and poor corrosion resistance. Long-term use is prone to aging, cracking, corrosion and damage.
[0004] To address this, a novel flexible joint for steam calcining furnaces is proposed. Utility Model Content
[0005] The purpose of this invention is to provide a novel flexible joint for steam calcining furnaces. This solution addresses the problem that existing flexible joints for furnace head sealing in steam calcining furnaces are mostly rubber structures without a reinforcing layer or with a double-layer aramid reinforcing layer. Lacking an effective reinforcing layer, they are prone to structural failure due to excessive stretching or compression when the furnace body moves up and down or experiences pressure fluctuations. This can lead to issues such as rubber tearing and reinforcing layer damage, further exacerbating sealing failure. Furthermore, the furnace head area of steam calcining furnaces operates at high temperatures, and there are corrosive media such as acidic gases and sulfides present within the furnace. The traditional flexible joints, which use materials without a reinforcing layer or with a double-layer aramid reinforcing layer, have poor high-temperature resistance, low strength, and poor corrosion resistance, making them prone to aging, cracking, and corrosion damage over long-term use.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel flexible section for a steam calcining furnace, comprising a flexible section body, the flexible section body comprising an outer rubber layer and an inner rubber layer, an intermediate reinforcing layer disposed between the outer rubber layer and the inner rubber layer, a reinforcing support layer disposed inside the intermediate reinforcing layer, the outer rubber layer and the inner rubber layer having a symmetrical structure, jointly wrapping the intermediate reinforcing layer and the reinforcing support layer, forming a double-layer rubber composite reinforcing structure; Both the outer and inner rubber layers are made of high-temperature resistant composite rubber. The intermediate reinforcing layer is three layers of high-temperature resistant and high-strength special fiber cloth. The reinforcing support layer is a layer of 316L stainless steel mesh sandwiched between the three layers of special fiber cloth in the intermediate reinforcing layer.
[0007] Preferably, the special fiber cloth of the intermediate reinforcing layer is carbon fiber cloth, and the surface of the special fiber cloth is treated with a silane coupling agent.
[0008] Preferably, a high-temperature resistant epoxy adhesive is used between the two adjacent layers of special fiber cloth, and the interlayer connection is achieved by pressure curing.
[0009] Preferably, the 316L stainless steel mesh of the reinforcing support layer has a weaving density of 14-16 mesh, a wire diameter of 0.19-0.2 mm, uniform mesh size, and is bonded to the outer layer between two adjacent special fiber cloths.
[0010] Preferably, the outer rubber layer and the inner rubber layer are both 1.2-1.5mm thick and have anti-slip textures inside.
[0011] Preferably, the special fiber cloth of the intermediate reinforcing layer has a high single-layer density and high-temperature resistance that matches that of the rubber layer.
[0012] Preferably, the ends of the outer rubber layer and the inner rubber layer are fixed to the edge of the 316L stainless steel mesh through a vulcanization process to form an integral structure.
[0013] Compared with the prior art, the beneficial effects of this utility model are: The novel flexible joint for steam calcining furnaces disclosed in this application utilizes a composite structure design consisting of two layers of high-temperature resistant composite rubber, three layers of special fiber cloth, and one layer of 316L stainless steel mesh. This design addresses the problems of poor tear resistance, sealing failure, easy aging and corrosion, and weak deformation resistance found in traditional flexible joints. The two layers of high-temperature resistant composite rubber form a basic sealing barrier, which, combined with the intermediate reinforcing layer of special fiber cloth and the reinforced support layer of stainless steel mesh, not only improves the tensile and tear resistance of the flexible joint but also ensures sufficient flexibility to accommodate the vertical movement of the furnace body. The overall structure achieves reliable sealing, strong weather resistance, and sufficient strength, preventing alkali leakage, dust generation, and furnace gas leakage, thus ensuring soda ash production efficiency and environmental safety. It is also suitable for the complex operating conditions of various steam calcining furnaces. Attached Figure Description
[0014] Figure 1 This is an overall structural diagram of the flexible section of the novel steam calcining furnace of this utility model; Figure 2 This is an exploded view of the main body of the flexible joint of this utility model; Figure 3 This is a schematic diagram showing the connection between the intermediate reinforcing layer and the reinforcing support layer of this utility model.
[0015] In the diagram, 1 is the main body of the flexible joint; 2 is the outer rubber layer; 3 is the inner rubber layer; 4 is the intermediate reinforcing layer; and 5 is the reinforcing support layer. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Please see Figure 1-3 The present invention provides the following technical solution: A novel flexible joint for a steam calcining furnace includes a flexible joint body 1, which includes an outer rubber layer 2 and an inner rubber layer 3. An intermediate reinforcing layer 4 is provided between the outer rubber layer 2 and the inner rubber layer 3. A reinforcing support layer is provided inside the intermediate reinforcing layer 4. The outer rubber layer 2 and the inner rubber layer 3 are symmetrical and together wrap the intermediate reinforcing layer 4 and the reinforcing support layer 5 to form a double-layer rubber composite reinforcing structure. Both the outer rubber layer 2 and the inner rubber layer 3 are made of high-temperature resistant composite rubber. The middle reinforcing layer 4 is three layers of high-temperature resistant and high-strength special fiber cloth. The reinforcing support layer 5 is a layer of 316L stainless steel mesh sandwiched between the three layers of special fiber cloth in the middle reinforcing layer 4.
[0018] In this embodiment: the outer rubber layer 2 and the inner rubber layer 3 symmetrically wrap the middle reinforcing layer 4 and the reinforcing support layer 5, forming a double-layer rubber composite reinforcement structure. The double rubber layer can doubly block the leakage of alkali dust and furnace gas inside the furnace. Compared with the traditional single-layer or double-layer rubber structure, the sealing barrier is more complete, effectively preventing alkali leakage and dust pollution of the production environment, while ensuring stable pressure inside the furnace, ensuring the efficiency of soda ash calcination reaction, and reducing product quality fluctuations. Both the outer and inner rubber layers 3 are made of high-temperature resistant composite rubber, which can withstand the high-temperature environment of the steam calcining furnace head and avoid the aging and cracking of the traditional aramid reinforcing layer due to high temperature. The three layers of the middle reinforcing layer 4 are high-temperature resistant. The combination of high-strength special fiber cloth and 316L stainless steel mesh in the reinforcing support layer 5 further enhances the temperature resistance. The 316L stainless steel mesh can resist corrosive media such as acidic gases and sulfides in the furnace, solving the problem of damage caused by corrosion in traditional flexible joints and extending the overall service life. The three layers of special fiber cloth provide sufficient tensile and tear resistance for the flexible joint, while the sandwiched 316L stainless steel mesh further enhances the overall rigidity, avoiding excessive stretching and compression deformation caused by the vertical movement of the furnace body or pressure fluctuations. At the same time, the weaving structure of the stainless steel mesh will not excessively weaken the bending and stretching capacity of the flexible joint, ensuring that it can adapt to the displacement requirements of the furnace body.
[0019] Specifically, such as Figure 2 As shown, the special fiber cloth of the intermediate reinforcing layer 4 is carbon fiber cloth, and the surface of the special fiber cloth is treated with silane coupling agent.
[0020] Specifically, such as Figure 3 As shown, high-temperature resistant epoxy adhesive is used between adjacent layers of special fiber cloth, and interlayer bonding is achieved through pressure curing.
[0021] Specifically, such as Figure 3 As shown, the 316L stainless steel mesh of the reinforcing support layer 5 has a weaving density of 14-16 mesh, a wire diameter of 0.19-0.2 mm, uniform mesh size, and is bonded to the outer layer between two adjacent special fiber cloths.
[0022] In this embodiment: carbon fiber cloth is selected as the special fiber cloth, which has excellent high-temperature resistance and mechanical strength, matching the high-temperature resistance of the rubber layer. This avoids interlayer separation caused by differences in material temperature resistance. Simultaneously, the surface of the fiber cloth is treated with a silane coupling agent, significantly improving the interfacial bonding force with the rubber layer and preventing delamination between the rubber and fiber cloth during use, ensuring overall structural stability. Adjacent layers of special fiber cloth are joined using a high-temperature resistant epoxy adhesive and cured under pressure, rather than through traditional simple lamination or low-strength bonding. This ensures that the three layers of fiber cloth form a tightly integrated reinforced structure without interlayer gaps, preventing the formation of gaps caused by high-temperature gases in the furnace. The separation and weakening of fiber cloth caused by the infiltration of alkali dust into the interlayer can be mitigated by the pressure curing process, which can also improve the bonding strength of the adhesive. This allows the force of the intermediate reinforcing layer 4 to be evenly transmitted to each layer of fiber cloth when subjected to tension or bending, further enhancing the overall resistance to deformation. The 316L stainless steel mesh, with a uniform weaving density of 14-16 mesh and a wire diameter of 0.19-0.2mm and consistent mesh size, can evenly distribute the tensile and compressive forces borne by the flexible section, avoiding the breakage of the stainless steel mesh or the damage of the fiber cloth caused by local stress concentration. Its support is more balanced, which can more effectively resist the impact of furnace movement and reduce the risk of structural failure.
[0023] Specifically, such as Figure 2 As shown, the outer rubber layer 2 and the inner rubber layer 3 are both 0.8-1mm thick, and their surfaces are provided with anti-slip and wear-resistant textures.
[0024] Specifically, such as Figure 2 As shown, the special fiber cloth of the intermediate reinforcing layer 4 has a high single-layer twill surface density and its high temperature resistance matches that of the rubber layer.
[0025] In this embodiment: the outer rubber layer 2 and the inner rubber layer 3 are of moderate thickness, providing sufficient sealing thickness to avoid rapid wear due to excessively thin rubber, while avoiding the bending and expansion performance of the flexible joint due to excessive thickness. The rubber layer has anti-slip texture inside, which can reduce the damage to the rubber inside caused by furnace vibration or alkaline dust friction, solving the problem that traditional smooth rubber layers are easily torn by equipment wear, leading to sealing failure, and extending the effective sealing cycle of the rubber layer. The high surface density of the special fiber cloth means a higher fiber content per unit area and better mechanical properties, which can provide stronger tensile and tear resistance for the flexible joint, avoiding the problem of insufficient strength and easy breakage caused by the sparse fibers of traditional low surface density fiber cloth. Even under the tension of furnace movement for a long time, fiber fatigue damage is not likely to occur, ensuring the long-term effectiveness of the reinforcement layer.
[0026] Specifically, such as Figure 2 As shown, the ends of the outer rubber layer 2 and the inner rubber layer 3 are fixed to the edge of the 316L stainless steel mesh through a vulcanization process to form an integral structure.
[0027] In this embodiment, the ends of the outer rubber layer 2 and the inner rubber layer 3 are fixed to the edge of the 316L stainless steel mesh through a vulcanization process, rather than by traditional bonding or mechanical connection. The vulcanization process allows the rubber and the stainless steel mesh to form a molecular-level bond, making the connection stronger and preventing the rubber from separating from the metal mesh or the edges from curling up during use. This prevents alkaline dust from seeping into the gaps at the ends and damaging the overall seal. Furthermore, this fixing method makes the flexible joint a complete and unified structure, allowing for smoother force transmission, reducing local stress concentration, and improving resistance to deformation.
[0028] Working principle: When the flexible joint body 1 is in use, the outer rubber layer 2 and the inner rubber layer 3 symmetrically wrap the middle reinforcing layer 4 and the reinforcing support layer 5, forming a double-layer rubber composite reinforcement structure. The double rubber layer can doubly block the leakage of alkali dust and furnace gas inside the furnace. Compared with the traditional rubber structure without a reinforcing layer or with a double aramid reinforcing layer, the sealing barrier is more complete, effectively preventing alkali leakage and dust pollution of the production environment, while ensuring stable pressure inside the furnace, ensuring the efficiency of soda ash calcination reaction, and reducing product quality fluctuations; both the outer and inner rubber layers 3 are made of high-temperature resistant composite rubber, which can withstand the high-temperature environment of the steam calcining furnace head and avoid the aging and cracking of traditional aramid reinforcing layers due to high temperatures; the middle reinforcing layer 4 and the reinforcing support layer 5 are symmetrically wrapped by the outer rubber layer 2 and the inner rubber layer 3. The three-layer high-temperature resistant and high-strength special fiber cloth of the strong layer 4 and the 316L stainless steel mesh of the reinforcing support layer 5 further enhance the temperature resistance performance. The 316L stainless steel mesh can resist corrosive media such as acidic gases and sulfides in the furnace, solving the problem of damage caused by corrosion in traditional flexible joints and extending the overall service life. The three-layer special fiber cloth provides sufficient tensile and tear resistance for the flexible joint, while the sandwiched 316L stainless steel mesh further enhances the overall rigidity, avoiding excessive stretching and compression deformation caused by the vertical movement of the furnace body or pressure fluctuations. At the same time, the weaving structure of the stainless steel mesh will not excessively weaken the bending and stretching capacity of the flexible joint, ensuring that it can adapt to the displacement requirements of the furnace body.
[0029] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A novel flexible joint for a steam calcining furnace, comprising a flexible joint body (1), characterized in that: The flexible joint body (1) includes an outer rubber layer (2) and an inner rubber layer (3). An intermediate reinforcing layer (4) is provided between the outer rubber layer (2) and the inner rubber layer (3). A reinforcing support layer is provided inside the intermediate reinforcing layer (4). The outer rubber layer (2) and the inner rubber layer (3) are symmetrical structures, and together they wrap the intermediate reinforcing layer (4) and the reinforcing support layer (5) to form a double-layer rubber composite reinforcing structure. The outer rubber layer (2) and the inner rubber layer (3) are both made of high-temperature resistant composite rubber. The intermediate reinforcing layer (4) is a three-layer high-temperature resistant and high-strength special fiber cloth. The reinforcing support layer (5) is a layer of 316L stainless steel mesh sandwiched between the three layers of special fiber cloth in the intermediate reinforcing layer (4).
2. The novel flexible joint for a steam calcining furnace according to claim 1, characterized in that: The special fiber cloth of the intermediate reinforcing layer (4) is carbon fiber cloth, and the surface of the special fiber cloth is treated with silane coupling agent.
3. The novel flexible joint for a steam calcining furnace according to claim 1, characterized in that: High-temperature resistant epoxy adhesive is used between adjacent layers of special fiber cloth, and the interlayer connection is achieved by pressure curing.
4. The novel flexible joint for a steam calcining furnace according to claim 1, characterized in that: The 316L stainless steel mesh of the reinforcing support layer (5) has a weaving density of 14-16 mesh, a wire diameter of 0.19-0.2 mm, uniform mesh size, and is bonded to the outer layer between two adjacent special fiber cloths.
5. The novel flexible joint for a steam calcining furnace according to claim 1, characterized in that: The outer rubber layer (2) and the inner rubber layer (3) are both 0.8-1mm thick and have anti-slip textures inside.
6. The novel flexible joint for a steam calcining furnace according to claim 1, characterized in that: The intermediate reinforcing layer (4) has a high density of single-layer twill fabric made of special fiber cloth, and its high temperature resistance matches that of the rubber layer.
7. The novel flexible joint for a steam calcining furnace according to claim 1, characterized in that: The ends of the outer rubber layer (2) and the inner rubber layer (3) are fixed to the edge of the 316L stainless steel mesh through a vulcanization process to form an integral structure.