High-temperature expansion joint without loss of thermal insulation material
By setting the ring body limit structure in the expansion joint and using aluminum silicate ceramic fiber insulation materials, the problem of heat insulation material loss is solved, and the safety and service life of the expansion joint are improved.
Patent Information
- Application Number
- CN202422372997.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-28
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-28
AI Technical Summary
The existing expansion joints are prone to heat insulation materials in high-temperature environments, causing high-temperature medium to damage the corrugated pipes and affecting the safety performance of the expansion joints.
The first ring body and the second ring body are arranged in the expansion joint to prevent the heat insulation material from being lost through axial limiting action, use aluminum silicate ceramic fibers as the heat insulation material, and prevent gap formation by spherical design.
Effectively prevent the loss of heat insulation materials, avoid contact with the corrugated tube, and improve the safety performance and service life of the expansion joint.
Smart Images
Figure CN223178443U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an expansion joint, which is used for compensating the angular displacement of a high-temperature pipeline. Background Art
[0002] As a compensator for a pipeline pressure pipeline, an expansion joint can compensate the angular displacement of the pipeline, etc., and plays a role in reducing the pipeline stress and increasing the service life of the pipeline. Especially in the case of high-temperature media (up to 650°C - 750°C), the pipeline has a large thermal expansion, the allowable stress of the material is low, and the risk of medium leakage is large, so strict requirements are imposed on the safety performance of the expansion joint.
[0003] A corrugated pipe is the core component of the expansion joint. In order to keep the expansion joint in a safe working state, a heat insulation layer is usually provided inside the expansion joint.
[0004] An expansion joint generally includes a corrugated pipe. The left and right ends of the corrugated pipe are respectively welded with connecting pipes. Inner pipes are respectively welded on the inner walls of the connecting pipes. The inner pipes at the left and right ends extend towards each other, and their extending ends overlap. There is a radial gap between the overlapping parts. The corrugated pipe and the inner pipes enclose a cavity, and a heat insulation material is filled in this cavity. The heat insulation material can prevent the high-temperature medium in the pipeline from damaging the corrugated pipe. When the pipeline has an angular displacement, the corrugated pipe expands and contracts, and the heat insulation material easily flows out along the overlapping gap of the inner pipes, causing the heat insulation material to fail, and the high-temperature medium will damage the corrugated pipe. Summary of the Utility Model
[0005] The technical problem to be solved by the utility model is to provide a high-temperature expansion joint without heat insulation material loss, which can prevent the loss of the heat insulation material and avoid the high-temperature medium from damaging the corrugated pipe.
[0006] The technical solution of the utility model is a high-temperature expansion joint without heat insulation material loss, which includes a corrugated pipe 6. The left end of the corrugated pipe is welded to an outer pipe 3, and the right end of the corrugated pipe is welded to an inner pipe 10 through a third ring body 7. The feature is that the left end of the inner pipe extends into the outer pipe, and the surface of the left end of the inner pipe has a convex spherical surface 8. A first ring body 4 and a second ring body 5 are fixedly arranged on the inner wall of the outer pipe. There is an axial interval between the first ring body 4 and the second ring body 5. The first ring body 4 and the second ring body 5 fitly sleeve on the spherical surface 8, and a heat insulation material 9 is filled between the corrugated pipe and the inner pipe.
[0007] The beneficial effect of the utility model is that the first ring body 4 and the second ring body 5 have an axial limiting effect on the inner pipe, and the inner pipe can only rotate in the outer pipe. When the pipeline has an angular displacement, no gap is formed between the second ring body and the spherical surface of the inner pipe, which can prevent the loss of the heat insulation material. Brief Description of the Drawings
[0008] Figure 1 It is a structural schematic diagram of the utility model.
[0009] Reference signs in the drawings: 1 - connecting pipe, 2 - reducing pipe, 3 - outer pipe, 4 - first ring body, 5 - second ring body, 6 - bellows, 7 - third ring body, 8 - spherical surface, 9 - heat insulation material, 10 - inner pipe. Detailed implementation manners
[0010] The detailed implementation manners of the present utility model will be described below in conjunction with the drawings.
[0011] A high-temperature expansion joint without heat insulation material loss includes a bellows 6. The left end of the bellows is welded to the outer pipe 3. The large end of the reducing pipe 2 is welded to the left end of the outer pipe. The small end of the left end of the reducing pipe 2 is welded to the connecting pipe 1. The right end of the bellows is welded to the third ring body 7. The third ring body 7 is sleeved on the inner pipe 10 and welded to the inner pipe.
[0012] The left end of the inner pipe extends into the outer pipe. The surface of the left end of the inner pipe has a convex spherical surface 8. The first ring body 4 and the second ring body 5 are fixedly arranged on the inner wall of the outer pipe. The wall thicknesses of the first ring body 4 and the second ring body 5 are equal. There is an axial gap between the first ring body 4 and the second ring body 5. The first ring body 4 and the second ring body 5 fitly sleeve on the spherical surface 8. Heat insulation material 9 is filled between the bellows and the inner pipe. The heat insulation material is aluminosilicate ceramic fiber.
[0013] The first ring body 4 and the second ring body 5 have an axial limiting effect on the inner pipe, so as to prevent a gap from being formed between the second ring body 5 and the spherical surface 8.
[0014] The heat insulation material can block the contact between the high-temperature medium and the bellows, avoiding damage to the bellows.
[0015] The bellows can have multiple corrugations, but it is not convenient to fill the heat insulation material. When the bellows has 1 corrugation, it is convenient to fill the heat insulation material. At this time, the width of the corrugation of the bellows should meet the requirements of the compensated angular displacement.
[0016] The first ring body can be welded to the inner wall of the outer pipe or extend from the inner wall of the outer pipe. The second ring body is welded to the outer pipe. The right end of the second ring body is flush with the right end of the outer pipe, so as to make the filling density of the heat insulation material uniform.
[0017] In use, the connecting pipe is welded to a cross-section of the pipeline, and the right end of the inner pipe is welded to another cross-section of the pipeline.
[0018] When the pipeline has an angular displacement, that is, the axes of the pipelines at both ends of the expansion joint are offset, the outer pipe and the inner pipe rotate relative to each other. One edge of the bellows is compressed, and the symmetric other edge is stretched to compensate for the angular displacement of the pipeline.
Claims
1. High-temperature expansion joint without heat insulation material loss, which comprises a corrugated pipe (6). The left end of the corrugated pipe is welded to an outer pipe (3), and the right end of the corrugated pipe is welded to an inner pipe (10) through a third ring body (7). It is characterized in that, The left end of the inner tube extends into the outer tube. The surface of the left end of the inner tube has a convex spherical surface (8). A first ring body (4) and a second ring body (5) are fixedly arranged on the inner wall of the outer tube. There is an axial interval between the first ring body (4) and the second ring body (5). The first ring body (4) and the second ring body (5) fit over the spherical surface (8). A heat insulation material (9) is filled between the corrugated pipe and the inner tube.
2. The high-temperature expansion joint without heat insulation material loss according to claim 1, characterized in that, The number of corrugations of the corrugated pipe is 1.
3. The high-temperature expansion joint without heat insulation material loss according to claim 1 is characterized in that, The right end of the second ring body is flush with the right end of the outer tube.