High-temperature and high-pressure nonmetal expansion joint

Abstract

The invention relates to a high-temperature and high-pressure nonmetal expansion joint which comprises annular steel frames and a heat insulation assembly, mounting flanges are arranged on the axial outer end faces of the left steel frame and the right steel frame respectively, 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 nested fixed guide cylinder and the floating guide cylinder 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 the non-metal expansion joint is overhigh, an external flexible skin is damaged at long-term high temperature is solved.

Description

Technical Field

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

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

[0003] The non-metal expansion joints in the prior art are welded with two staggered annular lining plates on both sides of the steel frame, and an annular opening is formed between the two annular lining plates to meet the multi-dimensional compensation of the pipeline axial and radial directions. For example, a high-stability non-metal expansion joint with patent number 202221463931.1 and a high-temperature resistant non-metal expansion joint with patent number 202411351621.4. This type of structure has the following defects: 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; The flexible skin has poor heat and pressure resistance, and its own protective performance is weak, and needs to be replaced regularly. Summary of the invention

[0004] The purpose of the present invention 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 of the external flexible skin being damaged under long-term high temperature due to overheating of the outer surface temperature of the non-metallic expansion joint.

[0005] The object of the present invention is achieved in that: 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 abuts against the steel frame on the left.

[0006] Preferably, a supporting skirt is radially extended outward from the outer end of the floating guide tube, and the supporting skirt is in contact with the steel frame on the left side.

[0007] Preferably, a limiting ring is provided on the left side steel frame corresponding to the supporting skirt, and the supporting skirt is limited between the limiting ring and the corresponding steel frame.

[0008] 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 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.

[0009] Preferably, the skin comprises a skin main body, an outer surface of the skin main body is provided with a protective net, and the protective net is fixed by binding cloth.

[0010] Preferably, partitions are provided between adjacent insulation layers, and a plurality of partitions are staggeredly distributed radially from the inside to the outside to form a maze structure.

[0011] 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 side.

[0012] The beneficial effects of the present invention are: The nested fixed guide tube and floating guide tube are used. Under the premise of meeting the axial and radial design compensation, the thickness of the insulation layer does not need to be reduced, ensuring the designed thermal insulation effect and solving the problem of the external flexible skin being damaged under long-term high temperature due to overheating of the outer surface of the non-metallic expansion joint; 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, protect the side of the skin body, and prevent the skin from being damaged from the side; The floating guide tube and the fixed guide tube can move relative to each other in the axial direction to absorb the axial displacement; 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. With the cooperation of the insulation layer (the insulation layer is wrapped by ceramic fiber cloth and steel wire mesh), the problem of overheating and damage of the expansion joint caused by the insulation layer being easily blown away by the flue gas from the gap between the main and auxiliary guide tubes in the long-term operation of the traditional expansion joint can be solved. 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

[0013] Figure 1 It is a structural schematic diagram of a high-temperature and high-pressure non-metallic expansion joint of the present invention.

[0014] Figure 2 for Figure 1 A partial enlarged view of point I in the middle.

[0015] Figure 3 This is a schematic diagram of the skin structure.

[0016] in: Steel frame 1; mounting flange 2; fixed guide tube 3; floating guide tube 4; supporting skirt 4.1; limiting ring 5; skin 6; skin body 6.1; protective net 6.2; edging cloth 6.3; thermal insulation layer 7; pressure ring 8; pull rod 9; partition 10. DETAILED DESCRIPTION

[0017] See also Figure 1-3 The present invention relates to a high-temperature and high-pressure non-metallic expansion joint, comprising a steel frame 1 and an insulation component. The steel frame 1 is annular, and the axial outer end faces of the left and right steel frames 1 are respectively provided with mounting flanges 2. The insulation component is arranged between the two steel frames 1. The insulation component comprises a skin 6 and multiple insulation layers 7. The multiple insulation layers 7 are arranged on the radial inner side of the skin 6. The insulation layer 7 is made of a ceramic fiber blanket, and the insulation layer 7 is sequentially wrapped with ceramic fiber cloth and at least one layer of steel wire mesh. The two side edges of the skin 6 are respectively installed on the steel frame 1 and fixed by a pressure ring 8. The pressure rings 8 on both sides are connected by a tie rod 9, thereby pressing the insulation component.

[0018] A nested combined sleeve is provided on the radial inner side of the insulation component, 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.

[0019] The outer end of the floating guide tube 4 has a support skirt 4.1 extending radially outward, and the support skirt 4.1 contacts the left steel frame 1. The left steel frame 1 is provided with a limit ring 5 corresponding to the support skirt 4.1, and the support skirt 4.1 is limited between the limit ring 5 and the corresponding steel frame 1 to ensure the radial and axial displacement of the floating guide tube 4.

[0020] The insulation layer 7 has four layers, and partitions 10 are arranged between adjacent insulation layers 7. Multiple partitions 10 are staggered and distributed radially from the inside to the outside to form a maze structure. There are three partitions 10, and the partition in the middle is welded to the steel frame 1 on the left side. The partitions 10 are made of metal.

[0021] 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, and 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, and can fix the protective net to improve the wear resistance and pressure resistance of the skin.

[0022] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A high-temperature and high-pressure non-metallic expansion joint, comprising a steel frame and an insulation component, wherein the steel frame is annular, and the axial outer end surfaces of the left and right steel frames are respectively provided with mounting flanges, and the insulation component is arranged between the two steel frames, characterized in that: A nested combined sleeve is provided on the radial inner side of the insulation component, and the nested combined 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 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. A high temperature and high pressure non-metallic expansion joint according to claim 1, characterized in that: The thermal insulation component comprises a skin and multiple insulation layers, wherein the multiple insulation layers are arranged on the radial inner side of the skin, the insulation layer is made of a ceramic fiber blanket, and the insulation layer is sequentially wrapped with ceramic fiber cloth and at least one layer of steel mesh.

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 which is provided with a protective net, which is fixed by binding cloth.

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

7. A 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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