High-temperature-resistant expansion joint
By using sleeves and refractory sleeves in the expansion joints, the stress uneven problem caused by thermal insulation materials on the inner wall of the corrugated pipe is solved, which extends the service life of the expansion joints and simplifies the manufacturing process, achieving more efficient production.
Patent Information
- Application Number
- CN202422373009.9
- 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 filling of heat insulation materials in existing expansion joints on the inner wall of the corrugated pipe causes uneven stress, easy fatigue in the trough, affecting service life, and complex manufacturing processes and low efficiency.
The channels formed by the first sleeve and the second sleeve are heat-insulated, combined with the refractory sleeve and flexible refractory filler to avoid heat-insulating material filling the inner wall of the corrugated pipe, and the casing gap forms thermal resistance. The refractory sleeve provides heat-insulating function. The peaks and valleys of the corrugated pipe are stressed uniformly during external force compression.
It improves the service life of the bellows, simplifies the manufacturing process of expansion joints, and improves production efficiency.
Smart Images
Figure CN223178444U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an expansion joint for compensating the axial displacement of a high-temperature pipeline. Background Art
[0002] An expansion joint is used to compensate the axial displacement or radial displacement of a pipeline. Its structure generally includes a corrugated pipe. Nozzles are provided at both ends of the corrugated pipe. Ring plates are respectively provided at the outer ends of the nozzles. A guide pipe is provided inside the inner ring of the ring plate. The cavity formed by the corrugated pipe, the guide pipe and the ring plate is filled with heat-insulating material, which can prevent the high-temperature medium from contacting the corrugated pipe and prevent the corrugated pipe from being damaged. There are some deficiencies in the expansion joint with this kind of structure. Since the heat-insulating material is filled in the inner wall of the corrugated pipe, when the corrugated pipe is compressed by an external force, the stresses generated at the wave crest and wave trough parts of the corrugated pipe are not equal. The stress at the wave trough is much greater than that at the wave crest, and the wave trough part is prone to fatigue, affecting the service life of the expansion joint. In addition, the process of filling the heat-insulating material into the corrugated pipe is also time-consuming and has low efficiency. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a high-temperature resistant expansion joint. In this expansion joint, the heat-insulating material is not arranged on the inner wall of the corrugated pipe, and the stress formed by the external force on the corrugated pipe is uniform, which can improve the service life of the corrugated pipe; the manufacturing process of the expansion joint is simplified, and the production efficiency can be improved.
[0004] The technical solution of the utility model is a high-temperature resistant expansion joint, which includes a corrugated pipe 3. A first nozzle 1 and a second nozzle 7 are respectively welded at both ends of the corrugated pipe. The feature is that a first sleeve 6 extending to the right is welded on the right end face of the first nozzle 1, and a second sleeve 5 extending to the left is welded on the left end face of the second nozzle 7. The second sleeve is sleeved on the first sleeve, and a refractory sleeve 4 made of refractory material is sleeved on the second sleeve. A flexible refractory filler 8 is provided between the second sleeve and the first nozzle, and the flexible refractory filler wraps around the first sleeve 6.
[0005] Its heat-insulating principle is that a radial gap between the first sleeve and the second sleeve forms a channel, which can improve the thermal resistance. The refractory sleeve has a heat-insulating function and can reduce the conduction of the high temperature of the medium to the corrugated pipe, effectively preventing the corrugated pipe from being impacted by high temperature.
[0006] Compared with the prior art, the beneficial effects are as follows: 1. The heat-insulating material is not filled in the inner wall of the corrugated pipe. When the corrugated pipe is compressed by an external force, the stresses generated at the wave crest and wave trough parts of the corrugated pipe are equal, and the wave trough part is not prone to fatigue, which can improve the service life of the expansion joint; 2. The structure of the expansion joint is simplified, and the production efficiency can be improved. Brief Description of the Drawings
[0007] Figure 1 It is a schematic structural view of the utility model.
[0008] Reference signs in the drawings: 1 - first connecting pipe, 2 - sheath, 3 - corrugated pipe, 4 - fireproof sleeve, 5 - second connecting pipe, 6 - first sleeve pipe, 7 - second connecting pipe, 8 - fireproof filler, 9 - flanging, 10 - ear plate, 11 - tie rod. Specific embodiments
[0009] The specific embodiments of the present utility model will be described below in conjunction with the accompanying drawings.
[0010] A high-temperature expansion joint includes a corrugated pipe 3. The first connecting pipe 1 and the second connecting pipe 7 are respectively welded at both ends of the corrugated pipe. It is characterized in that a first sleeve pipe 6 extending to the right is welded on the right end face of the first connecting pipe 1, and a second sleeve pipe 5 extending to the left is welded on the left end face of the second connecting pipe 7. The second sleeve pipe is sleeved on the first sleeve pipe, and a fireproof sleeve 4 made of fireproof material is sleeved on the second sleeve pipe. The length of the fireproof sleeve is equal to the length of the second sleeve pipe. Flexible fireproof filler is wrapped on the first sleeve pipe 6. The left end of the flexible fireproof filler is in contact with the first connecting pipe 1, and the right end of the flexible fireproof filler is in contact with the second sleeve pipe 4.
[0011] To prevent the loss of the flexible fireproof filler, a sheath 2 made of metal material is sleeved on the surface of the flexible fireproof filler, and the left end of the sheath 2 is welded on the first connecting pipe.
[0012] To facilitate the welding positioning between the first sleeve pipe and the first connecting pipe (the first sleeve pipe and the first connecting pipe are coaxial), the sheath 2 extends to the right from the first connecting pipe. The left end of the first sleeve pipe 6 has a flanging 9. The outer diameter of the flanging matches the inner diameter of the sheath, and the flanging is welded on the first connecting pipe.
[0013] The fireproof sleeve is a sleeve body formed by sintering fireproof mud, silica powder, etc. The flexible fireproof filler is aluminosilicate ceramic fiber or asbestos cloth.
[0014] The manufacturing steps of the high-temperature expansion joint are as follows: wind aluminosilicate ceramic fiber cloth (flexible fireproof filler) on the first sleeve pipe 6, and weld the first sleeve pipe 6 on the first connecting pipe 1; weld the second sleeve pipe on the second connecting pipe, and sleeve the fireproof sleeve on the second sleeve pipe; weld the first connecting pipe and the second connecting pipe on the corrugated pipe.
[0015] A plurality of ear plates 9 are symmetrically arranged on the first connecting pipe and the second connecting pipe respectively. The tie rod 10 passes through the ear plates, and both ends of the tie rod are connected to the ear plates with nuts. The function of the tie rod is to give the expansion joint a pre-tightening force to prevent the expansion joint from being damaged by additional pressure or tension during transportation, and it is also convenient for installation. The tie rod is removed during the working process.
Claims
1. A high temperature resistant expansion joint comprising a bellows (3), a first connecting pipe (1) and a second connecting pipe (7) being welded at both ends of the bellows, wherein The right end face of the first nozzle (1) is welded with a first sleeve (6) extending rightward. The left end face of the second nozzle (7) is welded with a second sleeve (5) extending leftward. The second sleeve is sleeved on the first sleeve, and a refractory sleeve (4) made of refractory material is sleeved on the second sleeve. A flexible refractory filler (8) is provided between the second sleeve and the first nozzle, and the flexible refractory filler wraps around the first sleeve (6).
2. The high-temperature resistant expansion joint according to claim 1, characterized in that, A sheath (2) made of metal material is sleeved on the surface of the flexible refractory filler, and the left end of the sheath is welded to the first nozzle (1).
3. The high-temperature resistant expansion joint according to claim 2, characterized in that, The sheath (2) extends rightward from the first nozzle, and the left end of the first sleeve (6) has a flange (9), and the outer diameter of the flange matches the inner diameter of the sheath.
4. The high-temperature resistant expansion joint according to claim 1 is characterized in that A plurality of ear plates (10) are symmetrically provided on the first nozzle and the second nozzle respectively. A tie rod (11) passes through the ear plates, and both ends of the tie rod are connected to the ear plates with nuts.