A high temperature resistant heat insulation device

Abstract

The present invention belongs to the technical field of steam pipes and provides a high-temperature resistant heat-insulating device, comprising a first working steel pipe, a second working steel pipe, a first guide tube, a second guide tube, an annular steel plate, an inner liner, an insulating device, a first annular rib, and a second annular rib; multiple layers of the first annular ribs and multiple layers of the second annular ribs are arranged alternately and spaced apart, and a cavity formed by the first guide tube, the inner liner, the second annular ribs, the first annular ribs, and the annular steel plate is filled with a hard, high-temperature resistant heat-insulating material. The device is installed on the working pipe at the entrance (exit) of a direct-buried steam pipe and can effectively solve the insulation connection problem between the prefabricated direct-buried steam pipe working pipe and the overhead pipe working pipe, ensuring that the outer protective pipe of the direct-buried steam pipe has good insulation properties to the ground and to non-protected pipes, meeting the insulation requirements of cathodic protection, obtaining safe and effective cathodic protection, slowing its corrosion rate, and ensuring the life of the direct-buried steam outer protective pipe.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam pipes, and in particular relates to a high-temperature resistant heat-insulating device. Background Art

[0002] In recent years, as urban landscapes have become increasingly important to cities, prefabricated direct-buried steam pipelines have become widely used in industrial parks and for centralized heating / cooling in southern China. The "Technical Specification for Direct-Buried Steam Pipelines for Urban Heating," CJJ / T104-2014, requires that direct-buried steam pipelines employ cathodic protection in addition to an external anti-corrosion coating. Furthermore, the "Technical Specification for Corrosion Control of Buried Steel Urban Gas Pipelines" (CJJ95-2013) stipulates that pipelines protected with cathodic protection should be equipped with electrical insulation to prevent conductive paths with other unprotected pipelines and ensure that the current is used for cathodic protection.

[0003] Because internal fixed supports are required in direct-buried steam pipe systems, to prevent cross-contamination between the compensation sections during dehumidification, the internal fixed supports are generally designed as a partition. Therefore, a metal structure is welded between the working pipe and the outer protective pipe at the internal fixed supports, creating a conductive path between the working pipe and the outer protective pipe. Conventional insulation devices in the prior art have low temperature resistance, and their operating temperature is far lower than the temperature of the transport medium (steam). Conventional insulation devices cannot be used to insulate the working pipe of the buried steam pipe from the working pipe of the overhead steam pipe. The working pipe of the overhead steam pipe has a grounding device, which creates a conductive path between the steel outer protective pipe of the direct-buried steam pipe and the grounding device of the overhead section. The cathodic protection current of the steel outer protective pipe of the direct-buried steam pipe is lost through the working pipe and the grounding device, causing an excessive anode output current load, preventing the protection potential from polarizing and failing to meet the predetermined protection requirements. This also significantly shortens the service life of the anode. Ultimately, the protection potential of the steel outer protective pipe of the direct-buried steam pipe is insufficient, or even loses its cathodic protection function, resulting in rapid corrosion and a short service life.

[0004] Therefore, there is an urgent need for a high-temperature resistant insulation device that can be installed at the entrance and exit of a directly buried steam pipeline, so that the working pipe of the buried steam pipeline and the working pipe of the overhead steam pipeline can be insulated at high temperatures to meet the insulation requirements of the cathodic protection pipeline. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a high-temperature resistant thermal insulation device, which can effectively solve the problem that the existing insulation device is not resistant to high temperatures, and solve the insulation connection problem between the prefabricated direct-buried steam pipeline working pipe and the overhead pipeline working pipe, so that the outer protective pipe of the direct-buried steam pipeline has good insulation to the ground and to non-protected pipelines, meets the insulation requirements of cathodic protection, obtains safe and effective cathodic protection, slows down its corrosion rate, and ensures the service life of the outer protective pipe of the direct-buried steam pipeline.

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solution: a high-temperature resistant heat-insulating device, comprising a first working steel pipe located on the left, a second working steel pipe located on the right, a first guide tube, a second guide tube, an annular steel plate, an inner liner, and an insulating device;

[0007] The left end of the first guide tube is welded to the first working steel pipe, and the right end of the second guide tube is welded to the second working steel pipe. The first guide tube and the second guide tube are spaced apart and coaxially arranged.

[0008] The outer side of the first guide tube is provided with multiple layers of first annular ribs, the inner edges of the first annular ribs are welded to the outer wall of the first guide tube, the inner liner is sleeved on the outer side of the first annular ribs, and a gap is left between the outer edges of the first annular ribs and the inner wall of the inner liner to insulate the two;

[0009] The inner edge of the annular steel plate is welded to the outer wall of the second guide cylinder, and the outer edge of the annular steel plate is welded to the inner liner;

[0010] The inner side of the inner liner is provided with multiple layers of second annular ribs, the outer edges of the second annular ribs are welded to the inner wall of the inner liner, and a gap is left between the inner edges of the second annular ribs and the outer wall of the first guide tube to insulate the two;

[0011] Multiple layers of the first annular ribs and multiple layers of the second annular ribs are alternately arranged, and a cavity formed by the first guide tube, the inner liner, the second annular ribs, the first annular ribs, and the annular steel plates is filled with a hard, high-temperature resistant, insulating material;

[0012] The insulating device is sleeved on the outside of the inner liner, the left end of the insulating device is welded to the first working steel pipe through a first connecting piece, and the right end of the insulating device is welded to the second working steel pipe through a second connecting piece. The cavity formed by the first connecting piece, the insulating device, the second connecting piece, the first guide tube, the inner liner, and the second guide tube is filled with thermal insulation material.

[0013] Preferably, the first connecting member includes a first reducer and a first connecting pipe, the small end of the first reducer is welded to the first working steel pipe, the large end of the first reducer is welded to the left end of the first connecting pipe, and the right end of the first connecting pipe is welded to the left end of the insulating device.

[0014] Preferably, the second connecting member includes a second reducer and a second connecting pipe, the small end of the second reducer is welded to the second working steel pipe, the large end of the second reducer is welded to the right end of the second connecting pipe, and the left end of the second connecting pipe is welded to the right end of the insulating device.

[0015] Preferably, the insulating device includes two left and right butt-welding flanges, bolts, and nuts. The left butt-welding flange is welded to the first connecting piece, and the right butt-welding flange is welded to the second connecting piece. Both butt-welding flanges are provided with screw holes. The bolts are simultaneously inserted into the screw holes of the two butt-welding flanges and are tightened and fixed by the nuts. An insulating kit is provided on the outer wall of the bolt, and an insulating gasket is provided between the two butt-welding flanges.

[0016] Preferably, the butt-weld flange is provided with a plurality of screw holes evenly spaced along the circumferential direction.

[0017] Preferably, the inner walls of the two butt-welding flanges are coated with an insulating first inner coating.

[0018] Preferably, the insulating device includes a left flange, a right flange, and a fixing sleeve, the left flange is welded to the first connecting piece, the right flange is welded to the second connecting piece, the right end of the left flange is abutted against the left end of the right flange, and an insulating ring is provided between the left flange and the right flange.

[0019] The outer diameter of the left part of the right flange is larger than the right side, the inner diameter of the right part of the fixing sleeve is smaller than the left side, and the right part of the fixing sleeve is sleeved on the outside of the right part of the right flange flange, so that the left end face of the right part of the fixing sleeve is in conflict with the right end face of the left part of the right flange flange, and an insulating ring is provided between the left end face of the right part of the fixing sleeve and the right end face of the left part of the right flange flange, and the fixing sleeve is welded to the left flange flange.

[0020] Preferably, an insulating filler is filled between the inner wall of the left part of the fixing sleeve and the outer wall of the left part of the right flange, and an insulating filler is filled between the inner wall of the right part of the fixing sleeve and the outer wall of the right part of the right flange.

[0021] Preferably, an insulating seal is provided between the left flange, the fixing sleeve and the left outer edge of the right flange.

[0022] Preferably, the inner walls of the left flange and the right flange are coated with an insulating second inner coating.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a high-temperature resistant heat-insulating device, wherein the first annular ribs and the second annular ribs are alternately arranged at intervals, and a maze structure is formed in combination with the first guide tube, the second guide tube, the inner lining tube, and the annular steel plate. Then, the maze structure is filled with high-temperature resistant hard heat-insulating material to achieve effective heat insulation between the insulating device and the high-temperature medium in the pipeline, preventing the high-temperature medium from directly contacting the insulating device, and reducing the operating temperature of the insulating device to achieve the purpose of high-temperature resistance of the insulating device. The insulating device always works below its maximum operating temperature, effectively ensuring the service life of the insulating device. When it is set on the working pipe at the inlet and outlet of the directly buried steam pipeline, good insulation of the outer protective pipe of the directly buried steam pipeline to the ground and to the non-protected pipe section can be achieved, meeting the insulation requirements of cathodic protection, and uniform polarization potential can be obtained with the minimum protection current, achieving the most economical and effective protection effect, slowing down the corrosion of the outer protective pipe, and ensuring its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic longitudinal section of a high-temperature resistant heat-insulating device provided in Example 1 of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the cross section at AA in the middle;

[0027] Figure 3 for Figure 1 An enlarged schematic diagram of point I in the middle;

[0028] Figure 4 A schematic longitudinal section of a high-temperature resistant heat-insulating device provided in Example 2 of the present invention;

[0029] Figure 5 for Figure 4 Schematic diagram of the cross section at the middle BB;

[0030] Figure 6 for Figure 4 Enlarged schematic diagram of point II in the middle.

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] 1. First working steel pipe; 2. First reducer; 3. First connecting pipe; 4. Insulation device; 5. First guide tube; 6. Second guide tube; 7. Annular steel plate; 8. Inner liner; 9. Second annular rib; 10. First annular rib; 11. Hard high-temperature resistant insulating material; 12. Thermal insulation material; 13. Second connecting pipe; 14. Second reducer; 15. Second working steel pipe; 401. Bolt; 402. Nut; 403. Butt welding flange; 404. Insulation kit; 405. Insulation gasket; 406. First inner coating; 1601. Left flange; 1602. Right flange; 1603. Fixing sleeve; 1604. Insulation ring; 1605. Insulation seal; 1606. Insulation filler; 1607. Second inner coating. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0034] It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integrated structures. Those skilled in the art will understand the specific meanings of such terms in this patent based on specific circumstances.

[0035] The specific embodiments are as follows:

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment provides a high-temperature resistant heat-insulating device, including a first working steel pipe 1 located on the left, a second working steel pipe 15 located on the right, and also includes a first guide tube 5, a second guide tube 6, an annular steel plate 7, an inner lining tube 8, and an insulating device 4.

[0038] The first working steel pipe 1 and the second working steel pipe 15 can be connected to the buried steam pipeline working pipe and the overhead steam pipeline working pipe respectively.

[0039] The left end of the first guide tube 5 is welded to the first working steel pipe 1 , and the right end of the second guide tube 6 is welded to the second working steel pipe 15 . The first guide tube 5 and the second guide tube 6 are spaced apart and coaxially arranged.

[0040] Among them, the left end of the first guide tube 5 can be inserted into the first working steel pipe 1 and welded, and the right end of the second guide tube 6 can be inserted into the second working steel pipe 15 and welded. A certain distance is left between the right end of the first guide tube 5 and the left end of the second guide tube 6 so that the two are insulated.

[0041] The outside of the first guide tube 5 is provided with multiple layers of first annular ribs 10, and the inner edges of the first annular ribs 10 are welded to the outer wall of the first guide tube 5. The inner liner 8 is provided on the outside of the first annular ribs 10, and a gap is left between the outer edge of the first annular ribs 10 and the inner wall of the inner liner 8, so that the two are insulated.

[0042] The inner edge of the first annular rib 10 and the outer wall of the first guide tube 5 can be welded, and the inner diameter of the inner liner 8 is larger than the outer diameter of the first annular rib 10 , so that an annular gap is formed between the inner liner 8 and the first annular rib 10 .

[0043] The inner edge of the annular steel plate 7 is welded to the outer wall of the second guide cylinder 6 , and the outer edge of the annular steel plate 7 is welded to the inner liner 8 .

[0044] The annular steel plate 7 is sleeved on the outside of the second guide tube 6 , the inner edge of the annular steel plate 7 and the outer wall of the second guide tube 6 can be welded together, and the outer edge of the annular steel plate 7 can be welded together with the inner wall of the inner liner 8 .

[0045] The inner side of the inner liner 8 is provided with multiple layers of second annular ribs 9, the outer edges of the second annular ribs 9 are welded to the inner wall of the inner liner 8, and a gap is left between the inner edge of the second annular ribs 9 and the outer wall of the first guide tube 5 to insulate the two.

[0046] Among them, the outer edge of the second annular rib 9 can be welded to the inner wall of the inner liner 8, the second annular rib 9 is sleeved on the outside of the first guide tube 5, and the inner diameter of the second annular rib 9 is larger than the outer diameter of the first guide tube 5, so that an annular gap is left between the second annular rib 9 and the first guide tube 5.

[0047] Multiple layers of the first annular ribs 10 and multiple layers of the second annular ribs 9 are alternately arranged, and the cavity formed by the first guide tube 5, the inner lining tube 8, the second annular ribs 9, the first annular ribs 10, and the annular steel plate 7 is filled with hard high-temperature resistant insulating material 11.

[0048] For example, if Figure 1As shown, the number of first annular ribs 10 and second annular ribs 9 is equal. The annular steel plate 7 is located to the right of the second annular rib 9, while the rightmost first annular rib 10 is located between the rightmost second annular rib 9 and the annular steel plate 7. This arrangement allows the first guide tube 5, the second guide tube 6, the annular steel plate 7, the inner liner 8, the second annular ribs 9, and the first annular ribs 10 to collectively form a maze-like structure. The gap between the right end of the first guide tube 5 and the left end of the second guide tube 6 serves as the maze entrance, insulating the first and second guide tubes 5 and 6. The annular gap between the leftmost second annular rib 9 and the first guide tube 5 serves as the maze exit. The maze passage is filled with a hard, high-temperature-resistant insulating material 11. This hard, high-temperature-resistant insulating material 11 is primarily insulating, has a lower thermal conductivity than steel, provides insulation, and is strong enough to withstand compression.

[0049] The insulating device 4 is sleeved on the outside of the inner lining tube 8, the left end of the insulating device 4 is welded to the first working steel pipe 1 through a first connecting piece, and the right end of the insulating device 4 is welded to the second working steel pipe 15 through a second connecting piece. The cavity formed by the first connecting piece, the insulating device 4, the second connecting piece, the first guide tube 5, the inner lining tube 8, and the second guide tube 6 is filled with thermal insulation material 12.

[0050] The left end of the first connector can be welded to the first working steel pipe 1, and the right end of the first connector can be welded to the left end of the insulation device 4. Similarly, the left end of the second connector can be welded to the right end of the insulation device 4, and the right end of the second connector can be welded to the second working steel pipe 15. The thermal insulation material 12 can be wrapped around the outside of the first guide tube 5, the inner liner 8, and the second guide tube 6. The thermal insulation material 12 is primarily for insulation and has low thermal conductivity. It can be soft or hard insulation material, but its overall strength is low.

[0051] Based on the above structure, filling the labyrinth channel with the hard, high-temperature-resistant insulating material 11 can extend the flow path of the medium and prevent the medium from entering the cavity of the insulating material 12, thereby preventing the high-temperature medium from directly contacting the insulating device. The heat of the high-temperature medium must be transferred to the insulating device 4 through the insulating material 12, effectively reducing the operating temperature of the insulating device 4. This effectively insulates the insulating device 4 from the high-temperature medium within the first guide tube 5 and the second guide tube 6. In other words, it can effectively insulate the insulating device from the high-temperature medium within the pipeline, preventing the high-temperature medium from directly contacting the insulating device, reducing the operating temperature of the insulating device, achieving the purpose of high-temperature resistance and thermal insulation of the insulating device. The insulating device always operates below its maximum operating temperature, effectively ensuring the service life of the insulating device. Installing it on the working pipe at the entrance (exit) of the direct-buried steam pipeline can achieve good insulation of the outer protective pipe of the direct-buried steam pipeline from the ground and from the unprotected pipe section, obtaining a uniform polarization potential with the minimum protection current, achieving the most economical and effective protection effect, slowing down the corrosion of the outer protective pipe, and ensuring its service life.

[0052] In this embodiment, the first connecting member may include a first reducer 2 and a first connecting pipe 3. The small end of the first reducer 2 is welded to the first working steel pipe 1, the large end of the first reducer 2 is welded to the left end of the first connecting pipe 3, and the right end of the first connecting pipe 3 is welded to the left end of the insulating device 4.

[0053] The second connecting piece may include a second reducer 14 and a second connecting pipe 13, the small end of the second reducer 14 is welded to the second working steel pipe 15, the large end of the second reducer 14 is welded to the right end of the second connecting pipe 13, and the left end of the second connecting pipe 13 is welded to the right end of the insulating device 4.

[0054] Among them, the right end of the second reducer 14 is a small head end, and the outer diameter of the small head end is equal to the outer diameter of the second working steel pipe 15. The small head end is welded to the second working steel pipe 15, and the large head end is equal to the outer diameter of the second connecting pipe 13. The large head end is welded to the right end of the second connecting pipe 13, and the left end of the second connecting pipe 13 is welded to the right end of the insulating device 4.

[0055] Based on the above structure, the first reducer 2 and the second reducer 14 together constitute a sealed cavity structure that expands toward the middle. After the expansion, it is convenient to arrange the inner liner 8 and other components inside. After the arrangement is completed, the remaining part of the cavity structure can be filled with the thermal insulation material 12.

[0056] like Figure 3As shown, in this embodiment, the insulating device 4 can include two left and right butt-welding flanges 403, bolts 401, and nuts 402. The left butt-welding flange 403 is welded to the first connecting piece, and the right butt-welding flange 403 is welded to the second connecting piece. Both of the two butt-welding flanges 403 are provided with screw holes, and the bolts 401 are simultaneously inserted into the screw holes of the two butt-welding flanges 403 and are locked and fixed by the nuts 402. The outer wall of the bolt 401 is provided with an insulating kit 404, and an insulating gasket 405 is provided between the two butt-welding flanges 403.

[0057] The left-side welding flange 403 can be welded to the right end of the first connecting pipe 3, and the right-side welding flange 403 can be welded to the left end of the second connecting pipe 13. An insulating gasket 405 is provided between the two welding flanges 403. The insulating sleeve 404 can isolate the bolt 401 from the left-side welding flange 403, effectively isolating the left-side welding flange 403 from the right-side welding flange 403. This serves as an insulating flange.

[0058] like Figure 2 As shown, the butt welding flange 403 is provided with a plurality of screw holes evenly spaced along the circumference, and correspondingly, a plurality of bolts 401 are matched with the nuts 402 to be locked and fixed.

[0059] In this embodiment, the inner walls of the two welding flanges 403 are coated with an insulating first inner coating 406. The first inner coating 406 can not only further reduce the heat transfer efficiency, but also improve the insulation performance of the insulating device 4.

[0060] Example 2

[0061] Based on Example 1, Example 2 differs from Example 1 in that the structure of the insulating device 4 is different.

[0062] like Figure 4-6 As shown, in this embodiment, the insulating device 4 may include a left flange 1601, a right flange 1602, and a fixing sleeve 1603. The left flange 1601 is welded to the first connecting member, and the right flange 1602 is welded to the second connecting member. The right end of the left flange 1601 abuts against the left end of the right flange 1602, and an insulating ring 1604 is provided between the left flange 1601 and the right flange 1602.

[0063] The outer diameter of the left part of the right flange flange 1602 is larger than the right side, the inner diameter of the right part of the fixing sleeve 1603 is smaller than the left side, and the right part of the fixing sleeve 1603 is sleeved on the outside of the right part of the right flange flange 1602, so that the left end face of the right part of the fixing sleeve 1603 conflicts with the right end face of the left part of the right flange flange 1602, and an insulating ring 1604 is provided between the left end face of the right part of the fixing sleeve 1603 and the right end face of the left part of the right flange flange 1602, and the fixing sleeve 1603 is welded to the left flange flange 1601.

[0064] The left flange 1601 can be welded to the right end of the first connecting pipe 3, and the right flange 1602 can be welded to the left end of the second connecting pipe 13. The left end of the fixing sleeve 1603 is welded to the left flange 1601. At the same time, the right portion of the fixing sleeve 1603 can limit the right flange 1602, preventing it from moving. That is, the left flange 1601 and the fixing sleeve 1603 cooperate to clamp the right flange 1602 in the middle, forming a stable structure.

[0065] An insulating ring 1604 is provided between the left flange 1601 and the right flange 1602 to isolate the left flange 1601 from the right flange 1602. Furthermore, an insulating ring 1604 is provided between the left end surface of the right portion of the fixing sleeve 1603 and the right end surface of the left portion of the right flange 1602 to isolate the right flange 1602 from the fixing sleeve 1603. This provides insulation.

[0066] In this embodiment, an insulating filler 1606 is filled between the inner wall of the left portion of the fixing sleeve 1603 and the outer wall of the left portion of the right flange 1602. An insulating filler 1606 is filled between the inner wall of the right portion of the fixing sleeve 1603 and the outer wall of the right portion of the right flange 1602.

[0067] The insulating filler 1606 can play the role of insulating seal, avoid the appearance of internal gaps, ensure the sealing performance of the insulating device, and enhance the insulation of the overall structure.

[0068] like Figure 3As shown, the insulating ring 1604 is arranged between the left flange flange 1601 and the right flange flange 1602, and the insulating filler 1606 is filled between the inner wall of the left part of the fixing sleeve 1603 and the outer wall of the left part of the right flange flange 1602. An insulating seal 1605 is provided at the connection between the two to ensure the sealing performance of the insulating device. The insulating seal 1605 can not only insulate and seal, but also limit the filler.

[0069] In this embodiment, the inner walls of the left flange 1601 and the right flange 1602 are both coated with an insulating second inner coating 1607 .

[0070] The second inner coating 1607 can not only further reduce the heat transfer efficiency, but also improve the insulation performance of the insulating device 4.

[0071] The mechanisms, components and parts not specifically described in the present invention are all existing structures in the prior art and can be directly purchased from the market.

[0072] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as limiting the present invention. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0073] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high temperature resistant heat insulation device, comprising a first working steel pipe (1) located on the left and a second working steel pipe (15) located on the right, characterized in that: It also includes a first guide tube (5), a second guide tube (6), an annular steel plate (7), an inner lining tube (8), and an insulating device (4); The left end of the first guide tube (5) is welded to the first working steel pipe (1), and the right end of the second guide tube (6) is welded to the second working steel pipe (15). The first guide tube (5) and the second guide tube (6) are spaced apart and coaxially arranged. The outer side of the first guide tube (5) is provided with a plurality of first annular ribs (10), the inner edge of the first annular ribs (10) is welded to the outer wall of the first guide tube (5), the inner liner (8) is provided on the outer side of the first annular ribs (10), and a gap is left between the outer edge of the first annular ribs (10) and the inner wall of the inner liner (8), so that the two are insulated; The inner edge of the annular steel plate (7) is welded to the outer wall of the second guide cylinder (6), and the outer edge of the annular steel plate (7) is welded to the inner lining cylinder (8); The inner side of the inner liner (8) is provided with a plurality of layers of second annular ribs (9), the outer edges of the second annular ribs (9) are welded to the inner wall of the inner liner (8), and a gap is left between the inner edge of the second annular ribs (9) and the outer wall of the first guide tube (5), so that the two are insulated; Multiple layers of the first annular ribs (10) and multiple layers of the second annular ribs (9) are alternately arranged at intervals, and a cavity formed by the first guide tube (5), the inner lining tube (8), the second annular ribs (9), the first annular ribs (10), and the annular steel plate (7) is filled with a hard high-temperature resistant insulating material (11); The insulating device (4) is sleeved on the outside of the inner lining tube (8), the left end of the insulating device (4) is welded to the first working steel pipe (1) through a first connecting piece, and the right end of the insulating device (4) is welded to the second working steel pipe (15) through a second connecting piece. The cavity formed by the first connecting piece, the insulating device (4), the second connecting piece, the first guide tube (5), the inner lining tube (8), and the second guide tube (6) is filled with thermal insulation material (12).

2. A high temperature resistant heat insulation device according to claim 1, characterized in that: The first connecting member comprises a first reducer (2) and a first connecting pipe (3); the small end of the first reducer (2) is welded to the first working steel pipe (1); the large end of the first reducer (2) is welded to the left end of the first connecting pipe (3); and the right end of the first connecting pipe (3) is welded to the left end of the insulating device (4).

3. A high temperature resistant heat insulation device according to claim 1, characterized in that: The second connecting member comprises a second reducer (14) and a second connecting pipe (13); the small end of the second reducer (14) is welded to the second working steel pipe (15); the large end of the second reducer (14) is welded to the right end of the second connecting pipe (13); and the left end of the second connecting pipe (13) is welded to the right end of the insulating device (4).

4. The high temperature resistant heat insulation device according to claim 1, characterized in that: The insulating device (4) comprises two left and right butt-welding flanges (403), bolts (401), and nuts (402). The left butt-welding flange (403) is welded to the first connecting piece, and the right butt-welding flange (403) is welded to the second connecting piece. Both the butt-welding flanges (403) are provided with screw holes. The bolts (401) are simultaneously inserted into the screw holes of the two butt-welding flanges (403) and are locked and fixed by the nuts (402). An insulating sleeve (404) is provided on the outer wall of the bolts (401), and an insulating gasket (405) is provided between the two butt-welding flanges (403).

5. A high temperature resistant heat insulation device according to claim 4, characterized in that: The butt welding flange (403) is provided with a plurality of screw holes evenly spaced along the circumference.

6. A high temperature resistant heat insulation device according to claim 4, characterized in that: The inner walls of the two butt-welding flanges (403) are both coated with an insulating first inner coating (406).

7. The high temperature resistant heat insulation device according to claim 1, characterized in that: The insulating device (4) comprises a left flange (1601), a right flange (1602), and a fixing sleeve (1603); the left flange (1601) is welded to the first connecting piece, the right flange (1602) is welded to the second connecting piece, the right end of the left flange (1601) is in contact with the left end of the right flange (1602), and an insulating ring (1604) is provided between the left flange (1601) and the right flange (1602); The outer diameter of the left side of the right flange (1602) is larger than the right side, the inner diameter of the right side of the fixing sleeve (1603) is smaller than the left side, and the right side of the fixing sleeve (1603) is sleeved on the outside of the right side of the right flange (1602), so that the left end face of the right side of the fixing sleeve (1603) is in conflict with the right end face of the left side of the right flange (1602), and an insulating ring (1604) is provided between the left end face of the right side of the fixing sleeve (1603) and the right end face of the left side of the right flange (1602), and the fixing sleeve (1603) is welded to the left flange (1601).

8. The high temperature resistant heat insulation device according to claim 7, characterized in that: An insulating filler (1606) is filled between the inner wall of the left part of the fixing sleeve (1603) and the outer wall of the left part of the right flange (1602), and an insulating filler (1606) is filled between the inner wall of the right part of the fixing sleeve (1603) and the outer wall of the right part of the right flange (1602).

9. The high temperature resistant heat insulation device according to claim 7, characterized in that: An insulating seal (1605) is provided between the left flange (1601), the fixing sleeve (1603) and the left outer edge of the right flange (1602).

10. The high temperature resistant heat insulation device according to claim 7, characterized in that: The inner walls of the left flange (1601) and the right flange (1602) are both coated with an insulating second inner coating (1607).

Images