High-temperature and high-pressure nonmetal expansion joint

Abstract

The utility model relates to a high-temperature high-pressure nonmetal expansion joint which comprises steel frames and a heat insulation assembly, the steel frames are annular, the axial outer end faces of the left steel frame and the right steel frame are respectively provided with a mounting flange, and the heat insulation assembly is arranged between the two steel frames. The nested combined sleeve comprises a fixed guide cylinder and a floating guide cylinder, the fixed guide cylinder is fixed on the steel frame on the right side, the floating guide cylinder is sleeved at the inner end of the fixed guide cylinder, the floating guide cylinder and the fixed guide cylinder are in radial zero clearance, and the outer end of the floating guide cylinder abuts against the steel frame on the left side. The fixed guide cylinder and the floating guide cylinder which are nested are adopted, on the premise that the axial and radial design compensation amount is met, the thickness of a heat preservation layer does not need to be reduced, the design heat insulation effect is ensured, and the problem that due to the fact that the temperature of the outer surface of a non-metal expansion joint is overhigh, an external flexible skin is damaged under long-term high temperature is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion joints, in particular to a high-temperature and high-pressure non-metallic expansion joint. Background Art

[0002] As a common displacement compensation component in smoke and air duct systems, non-metallic expansion joints are widely used in chemical, construction, water supply and drainage, petroleum, light and heavy industries, refrigeration, sanitation, plumbing, fire protection, electric power and other basic engineering fields.

[0003] Existing non-metallic expansion joints achieve multi-dimensional compensation in both the axial and radial directions of the pipeline by welding two staggered annular lining plates on either side of a steel frame, forming an annular opening between the two annular lining plates. Examples include a high-stability non-metallic expansion joint with patent number 202221463931.1 and a high-temperature-resistant non-metallic expansion joint with patent number 202411351621.4. These structures have the following drawbacks:

[0004] In order to meet the multi-dimensional compensation of the pipeline axial and radial directions within the limited insulation layer thickness, the insulation thickness must be reduced to a certain extent, resulting in reduced insulation effect, overheating of the outer surface of the non-metallic expansion joint, and ultimately causing the external flexible skin to break and fail under long-term high temperature;

[0005] The flexible skin has poor heat and pressure resistance, and its own protective performance is weak, and needs to be replaced regularly. Utility Model Content

[0006] The purpose of the present utility model is to overcome the above-mentioned shortcomings and provide a high-temperature and high-pressure non-metallic expansion joint, which adopts a nested fixed guide tube and a floating guide tube. Under the premise of meeting the axial and radial design compensation amounts, the thickness of the insulation layer does not need to be reduced, thereby ensuring the designed thermal insulation effect and solving the problem that the external flexible skin of the non-metallic expansion joint is damaged due to overheating of the outer surface temperature under long-term high temperature.

[0007] The purpose of this utility model is achieved in this way:

[0008] A high-temperature and high-pressure non-metallic expansion joint comprises a steel frame and an insulation component, wherein the steel frame is annular, and the axial outer end faces of the left and right steel frames are respectively provided with mounting flanges, and the insulation component is arranged between the two steel frames, and is characterized in that: a nested combination sleeve is provided on the radial inner side of the insulation component, and the nested combination sleeve comprises a fixed guide tube and a floating guide tube, the fixed guide tube is fixed on the steel frame on the right, the floating guide tube is sleeved on the inner end of the fixed guide tube, and there is a radial zero gap between the floating guide tube and the fixed guide tube, and the outer end of the floating guide tube is against the steel frame on the left.

[0009] Preferably, a support skirt extends radially outward from the outer end of the floating guide tube, and the support skirt contacts the steel frame on the left side.

[0010] Preferably, a limiting ring is provided on the supporting skirt corresponding to the left steel frame, and the supporting skirt is limited between the limiting ring and the corresponding steel frame.

[0011] Preferably, the thermal insulation assembly includes a skin and multiple insulation layers, the multiple insulation layers are arranged on the radial inner side of the skin, the insulation layer adopts a ceramic fiber blanket, and the insulation layer is wrapped with ceramic fiber cloth and at least one layer of steel mesh in sequence.

[0012] Preferably, the skin includes a skin main body, and a protective net is provided on the outer surface of the skin main body, and the protective net is fixed by an edging cloth.

[0013] Preferably, partitions are provided between adjacent insulation layers, and a plurality of partitions are staggered and distributed radially from the inside to the outside to form a maze structure.

[0014] Preferably, the insulation layer is provided with 4 layers, the partition is provided with 3 pieces, and the partition in the middle is welded to the steel frame on the left.

[0015] The beneficial effects of the utility model are:

[0016] The use of nested fixed and floating guide tubes eliminates the need to reduce the thickness of the insulation layer while meeting the axial and radial design compensation requirements, ensuring the designed thermal insulation effect and resolving the issue of the outer surface of non-metallic expansion joints being damaged by overheating due to long-term high temperatures.

[0017] A protective net is added to the outside of the skin and its edges are wrapped to improve the wear resistance and pressure resistance of the skin, and to protect the sides of the skin to prevent damage from the sides;

[0018] The floating guide tube and the fixed guide tube can move relative to each other in the axial direction to absorb the axial displacement;

[0019] The floating guide tube floats and follows the displacement of the fixed guide tube in the radial direction, achieving radial compensation while ensuring zero radial clearance between the floating guide tube and the fixed guide tube. In conjunction with the insulation layer (the insulation layer is wrapped with ceramic fiber cloth and steel mesh), this solves the problem of traditional expansion joints being easily blown away by flue gas through the gap between the main and auxiliary guide tubes during long-term operation, causing overheating and damage to the expansion joint.

[0020] Each insulation layer is separated into a maze-like structure by partitions, which can solve the problem of skin rupture due to excessive pressure in a high-pressure environment, leading to damage to the expansion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a structural schematic diagram of a high-temperature and high-pressure non-metallic expansion joint of the utility model.

[0022] Figure 2 for Figure 1 A local enlarged view of point I in the middle.

[0023] Figure 3 Schematic diagram of the skin structure.

[0024] in:

[0025] Steel frame 1; mounting flange 2; fixed guide tube 3; floating guide tube 4; support skirt 4.1; limiting ring 5; skin 6; skin body 6.1; protective net 6.2; edging cloth 6.3; insulation layer 7; pressure ring 8; pull rod 9; partition 10. DETAILED DESCRIPTION

[0026] See also Figure 1-3 The present invention relates to a high-temperature, high-pressure non-metallic expansion joint comprising a steel frame 1 and an insulation assembly. The steel frame 1 is annular, with mounting flanges 2 provided on the axially outer end faces of the left and right steel frames 1, respectively. The insulation assembly is disposed between the two steel frames 1 and comprises a skin 6 and multiple insulation layers 7 disposed radially inwardly of the skin 6. The insulation layers 7 are constructed of a ceramic fiber blanket, which is then wrapped in ceramic fiber cloth and at least one layer of steel mesh. The two sides of the skin 6 are mounted on the steel frame 1 and secured by compression rings 8. The compression rings 8 on both sides are connected by a tie rod 9, thereby compressing the insulation assembly.

[0027] A nested combined sleeve is provided on the radial inner side of the insulation assembly, and the nested combined sleeve includes a fixed guide tube 3 and a floating guide tube 4. The fixed guide tube 3 is fixed on the steel frame 1 on the right side, and the floating guide tube 4 is sleeved on the inner end of the fixed guide tube 3, and there is zero gap between the inner tube wall of the floating guide tube 4 and the outer tube wall of the fixed guide tube 3, and the outer end of the floating guide tube 4 is against the steel frame 1 on the left side.

[0028] A support skirt 4.1 extends radially outward from the outer end of the floating guide tube 4. This support skirt 4.1 contacts the left steel frame 1. A retaining ring 5 is provided on the left steel frame 1 corresponding to the support skirt 4.1. The support skirt 4.1 is retained between the retaining ring 5 and the corresponding steel frame 1, ensuring radial and axial displacement of the floating guide tube 4.

[0029] The insulation layer 7 has four layers, with partitions 10 provided between adjacent insulation layers 7. The partitions 10 are staggered radially from the inside to the outside, forming a maze structure. There are three partitions 10, with the middle partition welded to the left steel frame 1. The partitions 10 are made of metal.

[0030] The skin 6 includes a skin main body 6.1, which is composed of multiple layers of composite materials. A protective net 6.2 is provided on the outer surface of the skin main body 6.1. The protective net 6.2 is fixed by an edging cloth 6.3. The edging cloth 6.3 protects the side of the skin main body to prevent the skin from being damaged from the side position. At the same time, it can fix the protective net and improve the wear resistance and pressure resistance of the skin.

[0031] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. A high-temperature, high-pressure non-metallic expansion joint comprising a steel frame and an insulation assembly. The steel frame is annular, with mounting flanges provided on the axial outer end faces of the left and right steel frames, respectively. The insulation assembly is disposed between the two steel frames, and is characterized by: A nested combination sleeve is provided on the radial inner side of the insulation assembly, and the nested combination sleeve includes a fixed guide tube and a floating guide tube. The fixed guide tube is fixed on the steel frame on the right side, and the floating guide tube is sleeved on the inner end of the fixed guide tube, and there is a radial zero gap between the floating guide tube and the fixed guide tube, and the outer end of the floating guide tube is against the steel frame on the left side.

2. A high-temperature and high-pressure non-metallic expansion joint according to claim 1, characterized in that: A supporting skirt is radially extended outward from the outer end portion of the floating guide tube, and the supporting skirt is in contact with the steel frame on the left side.

3. A high-temperature and high-pressure non-metallic expansion joint according to claim 2, characterized in that: The steel frame on the left side is provided with a limiting ring corresponding to the supporting skirt, and the supporting skirt is limited between the limiting ring and the corresponding steel frame.

4. The high-temperature and high-pressure non-metallic expansion joint according to claim 1, characterized in that: The thermal insulation assembly includes a skin and multiple insulation layers, which are arranged on the radial inner side of the skin. The insulation layer is made of ceramic fiber blanket, and the insulation layer is wrapped with ceramic fiber cloth and at least one layer of steel mesh in sequence.

5. A high-temperature and high-pressure non-metallic expansion joint according to claim 4, characterized in that: The skin comprises a skin main body, the outer surface of the skin main body is provided with a protective net, and the protective net is fixed by wrapping cloth.

6. The high-temperature and high-pressure non-metallic expansion joint according to claim 4, characterized in that: Partitions are arranged between adjacent insulation layers, and multiple partitions are staggered and distributed radially from the inside to the outside to form a maze structure.

7. The high-temperature and high-pressure non-metallic expansion joint according to claim 6, characterized in that: The heat-insulating layer is provided with 4 layers, the partition is provided with 3 pieces, and the partition in the middle is welded to the steel frame on the left side.

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