High-temperature heat insulation device of metal bellow expansion joint
By using the high -temperature insulation structure in the metal wave pattern expansion joint, the insulation material and heat -resistant pouring are used to form a thermal insulation layer, which solves the problem of failure of the expansion joint in high temperature environments, improves performance and life, while reducing it. cost.
Patent Information
- Application Number
- CN202323617875.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2033-12-28
AI Technical Summary
When existing metal expansion joints operate in high-temperature environments, the material is prone to failure, affecting its fatigue life, and choosing high-temperature resistant materials will increase costs.
The high temperature thermal insulation structure is adopted, and the heat insulation layer is formed by installing the insulation filling material and heat -resistant pouring materials in the metal wave pattern expansion joint to block the heat transfer of the high temperature media.
The design temperature of the expansion section is reduced, the use stress and performance parameters of the material are improved, the fatigue life of the expansion joint is prolonged, and the cost of use is reduced.
Smart Images
Figure CN222416590U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of pipeline compensators, and in particular to a high-temperature heat insulation device for a metal bellows expansion joint. Background Art
[0002] Metal pipe compensators are a kind of pipe compensation components that have been widely used in my country in the past decade, especially in the fields of electricity, petrochemical, heating, steel, urban construction, etc. The role of metal expansion joints is to play a compensatory role in the power or thermal network, in the connection between equipment and pipelines, and between equipment and equipment, and also bear the system pressure. With the large-scale application of expansion joints, the working conditions are becoming more and more complicated. High temperature resistance, high pressure resistance, and corrosion resistance are the first issues to be considered when designing expansion joints.
[0003] The material selection of high temperature resistant expansion joints is very important. Usually, high temperature resistant materials are selected, and the expansion joints operate below the creep temperature. If the expansion joint operates at high temperature for a long time (within the creep temperature range), the material will fail differently from the normal temperature equipment, affecting the expected fatigue life of the expansion joint; choosing a material that can withstand higher temperatures will increase the cost of use. Therefore, how to achieve high temperature operation of the expansion joint under the premise of reducing costs has become one of the problems that technicians in this field need to solve urgently. Utility Model Content
[0004] This device provides a high temperature heat insulation device for a metal corrugated expansion joint. For this purpose, a high temperature heat insulation device is used to replace a high temperature resistant material. The high temperature heat insulation device effectively blocks the heat of the high temperature medium from being transferred to the expansion joint body, thereby improving the performance of the expansion joint. The specific implementation method is as follows:
[0005] A high temperature heat insulation device for a metal bellows expansion joint, comprising:
[0006] The anchor and the compound expansion joint structure are composed of a bellows, a connecting pipe and an intermediate connecting pipe. Two independent bellows are connected through an intermediate connecting pipe. The ends of the bellows are connected to the connecting pipe. An inner sleeve structure is provided inside the bellows.
[0007] A first thermal insulation filling space and a second thermal insulation filling space are installed with thermal insulation filling materials. The first thermal insulation filling space is specifically composed of the left side pipe end, the inner side of the bellows, and the outer side of the inner sleeve structure. The second thermal insulation filling space is specifically composed of the right side pipe end, the inner side of the bellows, and the outer side of the inner sleeve structure. An intermediate pipe is provided between the two thermal insulation filling materials. The thermal insulation filling material is used instead of the high-temperature resistant material to block the heat of the high-temperature medium from being transferred to the expansion joint body.
[0008] Based on the above technical solution, the heat-insulating filling material uses aluminum silicate wool and aerogel, a temperature-resistant material, which is filled in the heat-insulating filling space;
[0009] The heat-resistant castable is annularly casted on the outside of the inner sleeve structure. The outer side of the inner sleeve conduit and the external mold in the inner sleeve structure form a casting space for the heat-resistant castable. The heat-insulating filling material and the heat-resistant castable together form an insulating layer to reduce heat transfer to the connecting pipe, bellows and intermediate connecting pipe.
[0010] Based on the above technical scheme, the heat-insulating filling material and the heat-resistant castable together form a high-temperature insulation structure, which reduces the heat transferred to the connecting pipe, bellows and intermediate connecting pipe, and improves the allowable stress, performance parameters and fatigue life of the expansion joint; a mold is made according to the inner diameter of the expansion joint required by the design, which is used for the construction and pouring of the heat-resistant castable, and the first inner sleeve conduit, the third inner sleeve conduit and the external mold together constitute the pouring space for the heat-resistant castable.
[0011] Taking the connection relationship at the spatial position of the second thermal insulation filler as an example, the annular gap between the first inner sleeve duct and the second inner sleeve duct is slightly smaller than the diameter of the stainless steel wire mesh sleeve. The three are tightly fitted to prevent the thermal insulation filling material from escaping, and the annular gap between the first inner sleeve duct and the second inner sleeve duct should be considered to have no interference when the expansion joint is laterally displaced, and will not affect the displacement compensation.
[0012] Based on the above technical solution, the distance between the end face of the stainless steel wire mesh sleeve in the axial direction close to the first inner sleeve baffle side is greater than the axial displacement, and the distance between the end face of the second inner sleeve conduit in the axial direction away from the second inner sleeve ring plate side is greater than the axial displacement. In this design, the position of the stainless steel wire mesh sleeve is just in the annular gap between the first inner sleeve conduit and the second inner sleeve conduit. When the expansion joint is normally stretched and compressed, the stainless steel wire mesh sleeve always keeps running in the annular gap between the first inner sleeve conduit and the second inner sleeve conduit and is always in a sealed state.
[0013] Preferably, the inner sleeve structure includes a first inner sleeve assembly, a second inner sleeve assembly, a third inner sleeve assembly and a fourth inner sleeve assembly which are axially connected; the outer side of the first inner sleeve assembly and the outer side of the second inner sleeve assembly correspond to the spatial position of the first thermal insulation filler, and the third inner sleeve assembly and the fourth inner sleeve assembly correspond to the spatial position of the second thermal insulation filler.
[0014] Preferably, the first inner sleeve assembly includes a first inner sleeve conduit, one end of the first inner sleeve conduit is provided with a first inner sleeve baffle, and the other end thereof is provided with a first inner sleeve ring plate on the outside; the second inner sleeve assembly includes a second inner sleeve ring plate and a second inner sleeve conduit provided at the end of the second inner sleeve ring plate.
[0015] Preferably, the third inner sleeve assembly includes a third inner sleeve ring plate and a third inner sleeve conduit disposed at the end of the third inner sleeve ring plate, and the two have the same diameter; the fourth inner sleeve assembly includes a fourth inner sleeve ring plate and a fourth inner sleeve conduit disposed at the end of the fourth inner sleeve ring plate.
[0016] Based on the above technical solution, the second inner sleeve ring plate and the second inner sleeve guide tube are welded together to form a second inner sleeve assembly, and the second inner sleeve assembly is welded together to the middle pipe.
[0017] Preferably, the first inner ring plate is connected to the left connecting pipe, the right connecting pipe is connected to the fourth inner ring plate, and the second inner ring plate is sleeved on the inner side of the middle connecting pipe.
[0018] Preferably, it also includes a blocking structure respectively arranged at the two insulating filling spaces for preventing the insulating filling material from leaking out, which is composed of a stainless steel wire mesh and a stainless steel wire mesh sleeve; the stainless steel wire mesh is respectively lined on the outer surfaces of the overlapping parts of the first inner sleeve conduit and the second inner sleeve conduit, the stainless steel wire mesh sleeve is wrapped around the outer surfaces of the first inner sleeve conduit and the second inner sleeve conduit, and the stainless steel wire mesh sleeve is overlapped on the inner side of the long end of the folded stainless steel wire mesh, the stainless steel wire mesh is used to wrap the insulating filling material to prevent it from leaking out, and the stainless steel wire mesh sleeve is fixed by a fixing clip.
[0019] Based on the above technical solution, the end face distance of the stainless steel wire mesh sleeve in the axial direction close to the first inner sleeve baffle side and the end face distance of the second inner sleeve conduit in the axial direction away from the second inner sleeve ring plate side is greater than the axial displacement, and the stainless steel wire mesh sleeve is greater than the axial displacement. In this design, the position of the stainless steel wire mesh sleeve is just in the annular gap between the first inner sleeve conduit and the second inner sleeve conduit. When the expansion joint is normally stretched and compressed, the stainless steel wire mesh sleeve always keeps running in the annular gap between the first inner sleeve conduit and the second inner sleeve conduit and is always in a sealed state.
[0020] Preferably, the anchors are evenly arranged on the inner surfaces of the first inner sheath catheter and the third inner sheath catheter.
[0021] Based on the above technical solution, the anchors are evenly arranged on the inner surfaces of the first inner sleeve catheter and the third inner sleeve catheter, with a spacing of 200-300 mm.
[0022] In summary, this application includes the following beneficial technical effects:
[0023] 1. The utility model adopts a high-temperature heat-insulating structure, which can reduce the design temperature of the expansion joint, improve the allowable stress and performance parameters of the material, and the selection range of the expansion joint material is wider, and the expansion joint can be used in an environment with a higher medium temperature;
[0024] 2. The medium and high temperature insulation structure of the utility model is composed of insulation filling materials and heat-resistant castables, which reduces the heat transfer to the pipe, bellows, and intermediate pipe, and improves the allowable stress, performance parameters and fatigue life of the expansion joint;
[0025] 3. The utility model has a simple structure and is provided with a blocking structure composed of a stainless steel wire mesh and a stainless steel wire mesh sleeve, which effectively wraps the heat insulating filling material to prevent it from escaping. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a structural schematic diagram of the utility model;
[0027] Figure 2 This utility model Figure 1 A magnified view of the structure in the middle;
[0028] Figure 3 It is a cross-sectional view of the first inner sleeve assembly structure in the utility model;
[0029] Figure 4 It is a cross-sectional view of the second inner sleeve assembly structure in the utility model;
[0030] Figure 5 It is a cross-sectional view of the third inner sleeve assembly structure in the utility model;
[0031] Figure 6 It is a cross-sectional view of the fourth inner sleeve component structure in the utility model.
[0032] Description of reference numerals:
[0033] 1. connecting pipe, 2. bellows, 3. first inner sleeve assembly, 4. intermediate connecting pipe, 5. thermal insulation filling material, 6. stainless steel wire mesh, 7. anchor, 8. heat-resistant castable, 9. stainless steel wire mesh sleeve, 10. second inner sleeve assembly, 11. third inner sleeve assembly, 12. fourth inner sleeve assembly, 13. first inner sleeve ring plate, 14. first inner sleeve conduit, 15. first inner sleeve baffle, 16. second inner sleeve ring plate, 17. second inner sleeve conduit, 18. third inner sleeve ring plate, 19. third inner sleeve conduit, 20. fourth inner sleeve ring plate, 21. fourth inner sleeve conduit. DETAILED DESCRIPTION
[0034] The following describes the specific implementation of the utility model in conjunction with the accompanying drawings and embodiments:
[0035] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.
[0036] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.
[0037] The following is combined with Figure 1-6 This application is described in further detail.
[0038] An embodiment of the present application discloses a high-temperature heat insulation device for a metal bellows expansion joint.
[0039] Example 1
[0040] Reference Figures 1 to 6 The present embodiment discloses a high-temperature heat-insulating device for a metal bellows expansion joint, comprising an anchor 7, a compound expansion joint structure, a heat-resistant castable 8 and a heat-insulating filling material 5. The compound expansion joint structure consists of a bellows 2, a connecting pipe 1 and an intermediate connecting pipe 4. Two independent bellows 2 are connected via an intermediate connecting pipe 4. The ends of the bellows 2 are connected to the connecting pipe 1. An inner sleeve structure is provided on the inner side of the bellows 2. The heat-insulating filling material 5 is installed in the first heat-insulating filling space and the second heat-insulating filling space. In this structure, the inner sleeve structure comprises a first inner sleeve assembly 3, a second inner sleeve assembly 10, a third inner sleeve assembly 11 and a fourth inner sleeve assembly 12 which are axially connected.
[0041] The first thermal insulation filling space is specifically composed of the end of the left-side connecting pipe 1, the inner side of the bellows 2, and the outer side of the inner sleeve structure. The second thermal insulation filling space is specifically composed of the end of the right-side connecting pipe 1, the inner side of the bellows 2, and the outer side of the inner sleeve structure. An intermediate connecting pipe 4 is provided between the two thermal insulation filling materials 5. The thermal insulation filling material 5 is used instead of the high-temperature resistant material to block the heat of the high-temperature medium from being transferred to the expansion joint body.
[0042] The heat-resistant castable 8 is circumferentially cast on the outside of the inner sleeve structure. The outer side of the inner sleeve conduit and the external mold in the inner sleeve structure form a casting space for the heat-resistant castable 8. The heat-insulating filling material 5 and the heat-resistant castable 8 together form a high-temperature insulation structure to reduce heat transfer to the connecting pipe 1, the bellows 2 and the intermediate connecting pipe 4.
[0043] The outer side of the first inner sleeve component 3 and the outer side of the second inner sleeve component 10 correspond to the position of the first heat insulating filler space, the third inner sleeve component 11 and the fourth inner sleeve component 12 correspond to the position of the second heat insulating filler space, in this structure, the first inner sleeve component 3 includes a first inner sleeve conduit 14, one end of the first inner sleeve conduit 14 is provided with a first inner sleeve baffle 15, and the other end of the first inner sleeve conduit 13 is provided on the outside, the second inner sleeve component 10 includes a second inner sleeve ring plate 16 and a second inner sleeve conduit 17 provided at the end of the second inner sleeve ring plate 16, and the third inner sleeve component 3 includes a first inner sleeve conduit 14, a first inner sleeve baffle 15 is provided at one end of the first inner sleeve conduit 14, and a first inner sleeve ring plate 13 is provided on the outside of the other end of the first inner sleeve component 10. The sleeve assembly 11 includes a third inner sleeve ring plate 18 and a third inner sleeve tube 19 arranged at the end of the third inner sleeve ring plate 18, and the two have the same diameter. The fourth inner sleeve assembly 12 includes a fourth inner sleeve ring plate 20 and a fourth inner sleeve tube 21 arranged at the end of the fourth inner sleeve ring plate 20. The first inner sleeve ring plate 13 is connected to the left side pipe 1, and the right side pipe 1 is connected to the fourth inner sleeve ring plate 20. The second inner sleeve ring plate 16 is sleeved on the inner side of the middle pipe 4, and the anchors 7 are evenly arranged on the inner surfaces of the first inner sleeve tube 14 and the third inner sleeve tube 19.
[0044] The blocking structure is composed of a stainless steel wire mesh 6 and a stainless steel wire mesh sleeve 9. The stainless steel wire mesh 6 is respectively lined on the outer surfaces of the overlapping parts of the first inner sleeve conduit 14 and the second inner sleeve conduit 17. The stainless steel wire mesh sleeve 9 is wrapped around the outer surfaces of the first inner sleeve conduit 14 and the second inner sleeve conduit 17. The stainless steel wire mesh sleeve 9 is overlapped on the inner side of the long end of the stainless steel wire mesh 6 in a folded state. The stainless steel wire mesh 6 is used to wrap the thermal insulation filling material 5 to prevent it from escaping, and the stainless steel wire mesh sleeve 9 is fixed by a fixing clip.
[0045] Taking the connection relationship at the second thermal insulation filler space position as an example, the annular gap between the first inner sleeve conduit 14 and the second inner sleeve conduit 17 is smaller than the diameter of the stainless steel wire mesh sleeve 9, and the three are tightly fitted to prevent the thermal insulation filler material 5 from escaping.
[0046] The installation method adopted by the high-temperature heat insulation device is: the second inner sleeve ring plate 16 and the second inner sleeve conduit 17 are welded together to form the second inner sleeve assembly 10, and the second inner sleeve assembly 10 is welded together with the intermediate pipe 4; the third inner sleeve ring plate 18 and the third inner sleeve conduit 19 are welded together to form the third inner sleeve assembly 11, the third inner sleeve conduit 19 and the stainless steel wire mesh sleeve 9 are fixed together, and the third inner sleeve assembly 11 is welded together with the second inner sleeve ring plate 16; the heat insulation filling material 5 is loaded into the space formed by the pipe 1, the bellows 2, the intermediate pipe 4, the second inner sleeve assembly 10, and the third inner sleeve assembly 11. Before assembling the fourth inner sleeve assembly 12, the stainless steel wire mesh 6 is inserted between the third inner sleeve conduit 19 and the heat insulation filling material 5 and a certain margin is left, so that the third inner sleeve conduit 19 and the fourth inner sleeve conduit 21 The heat-insulating filling material 5 at the annular seam between them is wrapped with the stainless steel wire mesh 6; the fourth inner sleeve assembly 12 is installed, and the fourth inner sleeve ring plate 20 is welded to the connecting pipe 1; the first inner sleeve ring plate 13, the first inner sleeve conduit 14, and the first inner sleeve baffle 15 are welded into the first inner sleeve assembly 3, and the first inner sleeve conduit 14 is fixed to the stainless steel wire mesh sleeve 9; the heat-insulating filling material 5 is first fixed to the inner surfaces of the connecting pipe 1, the bellows 2, and the middle connecting pipe 4, and the annular weld between the first inner sleeve conduit 14 and the second inner sleeve ring plate 16 is lined with stainless steel wire mesh 6 to wrap the heat-insulating filling material 5; the first inner sleeve assembly 3 is inserted, and the pipe 1 and the first inner sleeve ring plate 13 are welded together; the first inner sleeve conduit 14 and the inner surfaces of the third inner sleeve conduit 19 are spot-welded to fix the anchor 7; the mold is installed, and the heat-resistant castable 8 is poured.
[0047] Many other changes and modifications can be made without departing from the concept and scope of the utility model. It should be understood that the utility model is not limited to a specific embodiment, and the scope of the utility model is defined by the appended claims.
Claims
1. A high temperature heat insulation device for a metal bellows expansion joint, characterized in that: include: The anchor (7) and the compound expansion joint structure are composed of a bellows (2), a connecting pipe (1) and an intermediate connecting pipe (4), the two independent bellows (2) are connected via the intermediate connecting pipe (4), the end of the bellows (2) is connected to the connecting pipe (1), and the inner side of the bellows (2) is provided with an inner sleeve structure; A first heat-insulating filler space and a second heat-insulating filler space are installed with heat-insulating filler material (5). The first heat-insulating filler space is specifically composed of the end of the connecting pipe (1) on the left, the inner side of the bellows (2), and the outer side of the inner sleeve structure. The second heat-insulating filler space is specifically composed of the end of the connecting pipe (1) on the right, the inner side of the bellows (2), and the outer side of the inner sleeve structure. The heat of the high-temperature medium is blocked from being transferred to the expansion joint body by the heat-insulating filler material (5) instead of the high-temperature resistant material.
2. A high temperature heat insulation device for a metal bellows expansion joint according to claim 1, characterized in that: It also includes a heat-resistant castable (8) which is circumferentially cast on the outside of the inner sleeve structure. The space between the outside of the inner sleeve conduit and the external mold in the inner sleeve structure forms a casting space for the heat-resistant castable (8). The heat-insulating filling material (5) and the heat-resistant castable (8) together form an insulating layer to reduce heat transfer to the connecting pipe (1), the corrugated pipe (2) and the intermediate connecting pipe (4).
3. A high temperature heat insulation device for a metal bellows expansion joint according to claim 2, characterized in that: The inner sleeve structure comprises a first inner sleeve component (3), a second inner sleeve component (10), a third inner sleeve component (11) and a fourth inner sleeve component (12) which are axially connected; The outer side of the first inner sleeve component (3) and the outer side of the second inner sleeve component (10) correspond to the spatial position of the first thermal insulation filler, and the third inner sleeve component (11) and the fourth inner sleeve component (12) correspond to the spatial position of the second thermal insulation filler.
4. A high temperature heat insulation device for a metal bellows expansion joint according to claim 3, characterized in that: The first inner sleeve assembly (3) comprises a first inner sleeve conduit (14), one end of the first inner sleeve conduit (14) is provided with a first inner sleeve baffle (15), and the other end of the first inner sleeve conduit (14) is provided with a first inner sleeve ring plate (13) on the outside; The second inner sleeve assembly (10) comprises a second inner sleeve ring plate (16) and a second inner sleeve guide tube (17) arranged at the end of the second inner sleeve ring plate (16).
5. A high temperature heat insulation device for a metal bellows expansion joint according to claim 4, characterized in that: The third inner sleeve assembly (11) comprises a third inner sleeve ring plate (18) and a third inner sleeve guide tube (19) arranged at the end of the third inner sleeve ring plate (18), and the two have the same diameter; The fourth inner sleeve assembly (12) comprises a fourth inner sleeve ring plate (20) and a fourth inner sleeve guide tube (21) arranged at the end of the fourth inner sleeve ring plate (20).
6. A high temperature heat insulation device for a metal bellows expansion joint according to claim 5, characterized in that: The first inner ring plate (13) is connected to the connecting pipe (1) on the left, the connecting pipe (1) on the right is connected to the fourth inner ring plate (20), and the second inner ring plate (16) is sleeved on the inner side of the middle connecting pipe (4).
7. A high temperature heat insulation device for a metal bellows expansion joint according to claim 5, characterized in that: It also includes a blocking structure respectively arranged at two heat-insulating filler spaces for preventing the heat-insulating filler material (5) from leaking out, and the blocking structure is composed of a stainless steel wire mesh (6) and a stainless steel wire mesh sleeve (9); The stainless steel wire mesh (6) is respectively lined on the outer surface of the overlapped portion of the first inner sleeve conduit (14) and the second inner sleeve conduit (17); the stainless steel wire mesh sleeve (9) is wrapped around the outer surface of the first inner sleeve conduit (14) and the second inner sleeve conduit (17); the stainless steel wire mesh sleeve (9) is overlapped on the inner side of the long end of the stainless steel wire mesh (6) in a folded state; the stainless steel wire mesh (6) is used to wrap the thermal insulation filling material (5) to prevent it from escaping; and the stainless steel wire mesh sleeve (9) is fixed by a fixing clip.
8. A high temperature heat insulation device for a metal bellows expansion joint according to claim 7, characterized in that: Taking the connection relationship at the spatial position of the second thermal insulation filler as an example, the annular gap between the first inner sleeve conduit (14) and the second inner sleeve conduit (17) is smaller than the diameter of the stainless steel wire mesh sleeve (9), and the three are tightly fitted to prevent the thermal insulation filler material (5) from escaping.
9. A high temperature heat insulation device for a metal bellows expansion joint according to claim 5, characterized in that: The anchors (7) are evenly arranged on the inner surfaces of the first inner sheath catheter (14) and the third inner sheath catheter (19).