A high-temperature-resistant stainless steel pipe
By installing an outer jacket, insulation filling components, and outer protective components on the outside of the heat-resistant steel pipe, the problem of insufficient protection for high-temperature resistant insulated steel pipes when laid in the open air is solved, achieving effective protection and convenient maintenance of the pipeline.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU KAIFU IND CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-21
AI Technical Summary
When high-temperature resistant insulated steel pipes are laid in the open air, they are easily damaged by strong winds and external forces, and the existing technology is not protective enough.
Multiple outer jackets are installed on the outside of the heat-resistant steel pipe, and the gaps between them are filled with thermal insulation components, including a pressure-resistant layer and a high-temperature buffer layer. A removable outer protective component is installed on the outside, which is protected by ring clamps and pressure-resistant frames. The outer protective component can be maintained without cutting off the pipeline.
It improves the ease of pipeline maintenance, enhances protection against external impacts, prevents indentation and damage, and reduces heat loss.
Smart Images
Figure CN224533879U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of stainless steel pipe technology, and more specifically, to a high-temperature resistant stainless steel pipe. Background Technology
[0002] High-temperature resistant steel pipe is a type of pipeline system used to transport high-temperature steam (usually above 300°C). It has excellent thermal insulation and heat resistance, which can effectively reduce heat loss and ensure safe operation. The inner steel pipe is usually made of heat-resistant alloy steel, which can withstand high-temperature steam of 300°C to 600°C for a long time, while the outer protective pipe may be made of high-temperature resistant materials.
[0003] Chinese Patent Announcement No. CN219198546U discloses a high-temperature resistant polyurethane insulated steel pipe. This solution provides initial insulation through the gap between the inner steel pipe and the insulation pipe. It improves the insulation capacity and increases the strength of the insulation pipe layer by embedding vacuum tubes for insulation. An inner insulation layer is formed by an inner pad pipe and a sandwich pipe, and an outer insulation layer is formed by the sandwich pipe and the outer sleeve pipe. The outer layer is filled with polyurethane foam for insulation. The pipe is divided into multiple sectors by inner and outer partition plates for isolation and protection and to increase the pipe's resistance to damage.
[0004] When high-temperature resistant insulated steel pipes are used to transport high-temperature steam or hot media over long distances, they often need to be laid in the open air to avoid geologically unstable areas or reduce the complexity of underground construction. However, this method of laying pipes exposes them to complex environmental stresses for a long time. Strong winds can cause the pipes to sway, leading to friction of supports or loosening of connectors. In industrial areas or along transportation routes, they may be damaged by external forces such as falling objects. The above-mentioned solutions only provide internal support and protection by filling with polyurethane, which is insufficient in terms of protection.
[0005] Therefore, a high-temperature resistant stainless steel pipe is proposed to address the above problems. Utility Model Content
[0006] 1. Technical problems to be solved This utility model provides a high-temperature resistant stainless steel pipe, which can improve the problems existing in related technologies: high-temperature resistant insulated steel pipes often need to be laid in the open air, but this method of laying makes the pipes exposed to complex environmental stress for a long time, strong winds cause the pipes to sway, and they may be damaged by external forces such as falling objects.
[0007] 2. Technical Solution To solve the above problems, the present invention adopts the following technical solution.
[0008] This application provides a high-temperature resistant stainless steel pipe, including a heat-resistant steel pipe and further comprising: multiple outer sleeves, a thermal insulation filling assembly, a connecting assembly, and an outer protective assembly. The multiple outer sleeves are sequentially fitted over the heat-resistant steel pipe. The thermal insulation filling assembly is located between the heat-resistant steel pipe and the outer sleeves to fill the gap. The thermal insulation filling assembly includes multiple sets of pressure-resistant layers, which are located inside the outer sleeves. The multiple outer sleeves are connected by the connecting assembly. The outer protective assembly is fitted over the outer sleeves and includes two ring clamps. Multiple equidistantly distributed pressure-resistant frames are fixedly installed between the two ring clamps. The outer protective assembly protects the outside of the outer sleeves, and the pressure-resistant layers support the inside of the outer sleeves to prevent inward collapse.
[0009] The technical solutions described in this application embodiment have at least the following technical effects: An insulation filling component is installed between the heat-resistant steel pipe and the outer casing. This component not only provides thermal insulation but also, through its internal pressure-resistant layer, offers internal support to the outer casing. A removable outer protective component is installed on the outside of the outer casing. This component, through the cooperation of a ring clamp and a pressure-resistant frame, provides external protection for the outer casing. When subjected to external impacts or other damage, the outer protective component and the pressure-resistant layer work together to protect the pipeline from the inside out. Furthermore, if the outer protective component is damaged, it can be repaired or replaced without disconnecting the pipeline, improving maintenance convenience.
[0010] In some embodiments, the thermal insulation filling assembly further includes a high-temperature buffer layer and a thermal insulation layer. The high-temperature buffer layer is sleeved on the surface of the heat-resistant steel pipe and is made of flexible graphite foil. The thermal insulation layer is disposed outside the pressure-resistant layer and is made of aluminum foil reflective film.
[0011] In some embodiments, the thermal insulation filling assembly further includes a padding layer and a moisture-proof sealing layer. The padding layer is disposed outside the thermal insulation layer and is made of fiberglass cloth. The moisture-proof sealing layer is in close contact with the inner side of the outer sleeve and is made of aluminum-magnesium alloy foil.
[0012] In some embodiments, the pressure-resistant layer includes splicing blocks, which are arc-shaped. One end of each splicing block is fixedly mounted with an installation block, and the other end of each splicing block has an installation groove adapted to the installation block. Multiple splicing blocks are connected through the installation block and the installation groove. The splicing blocks are made of microporous calcium silicate hard shell material.
[0013] In some embodiments, the connecting assembly includes a connecting ring, with annular grooves on both sides of the connecting ring, and slots on both ends of the outer sleeve. A retaining ring is fixedly installed inside the annular groove, and one end of the outer sleeve extends into the annular groove. The slots and retaining rings engage to form a connection.
[0014] In some embodiments, a reinforcing rib is fixedly installed on the outside of the connecting ring to prevent the connecting ring from deforming.
[0015] In some embodiments, the outer protective assembly further includes a plurality of reinforcing rings, the inner side of which is fixedly connected to a plurality of the compression-resistant frames, and connecting blocks are fixedly installed at both ends of the ring clamp, the connecting blocks being installed on the outside of the connecting ring. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the thermal insulation filling component structure of this utility model; Figure 3 This is a cross-sectional view of the thermal insulation filling component of this utility model; Figure 4 This is a schematic diagram of the compressive layer structure of this utility model; Figure 5 This is a schematic diagram of the outer protective component structure of this utility model; Figure 6 This is a schematic diagram of the connection assembly installation structure of this utility model; Figure 7 For the present utility model Figure 6 Enlarged structural diagram at point A in the middle.
[0017] Explanation of the labels in the diagram: 1. Heat-resistant steel pipe; 2. Outer tube; 3. Thermal insulation filling component; 31. High-temperature buffer layer; 32. Compression-resistant layer; 321. Interlocking block; 322. Mounting groove; 323. Mounting block; 33. Thermal insulation layer; 34. Pad layer; 35. Moisture-proof sealing layer; 4. Outer protective components; 41. Ring clamps; 42. Compression frame; 43. Reinforcing rings; 44. Connecting blocks; 5. Connecting components; 51. Connecting ring; 52. Reinforcing rib; 53. Annular groove; 54. Snap ring; 6. Card slot. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0019] Please see Figure 1 - Figure 7 This application provides a high-temperature resistant stainless steel pipe, including a heat-resistant steel pipe 1, and further including: multiple outer sleeves 2, a heat insulation filling component 3, a connecting component 5, and an outer protective component 4. The multiple outer sleeves 2 are sequentially sleeved on the outside of the heat-resistant steel pipe 1. The heat insulation filling component 3 is located between the heat-resistant steel pipe 1 and the outer sleeves 2 to fill the gap. The heat insulation filling component 3 includes multiple sets of pressure-resistant layers 32, which are located inside the outer sleeves 2. The multiple outer sleeves 2 are connected by the connecting component 5. The outer protective component 4 is sleeved on the outside of the outer sleeves 2. The outer protective component 4 includes two ring clamps 41, and multiple equidistantly distributed pressure-resistant frames 42 are fixedly installed between the two ring clamps 41. The outer protective component 4 protects the outside of the outer sleeves 2, and the pressure-resistant layers 32 support the inside of the outer sleeves 2 to prevent inward collapse.
[0020] The device in this scheme is mainly used for high-temperature steam transportation, such as in municipal heating or power plants. The overall structure is divided into two layers, inner and outer. The inner layer is a heat-resistant steel pipe 1, which is the transportation pipeline. Compared with ordinary stainless steel pipes, the heat-resistant steel pipe 1 is subjected to solid solution treatment, aging hardening and other processes, and then grain boundary strengthening, such as adding elements such as boron and titanium to inhibit grain growth, so that it can maintain its strength and oxidation resistance at high temperatures.
[0021] An outer sleeve 2 is fitted over the heat-resistant steel pipe 1. The outer sleeve 2 is composed of multiple sections, which are connected by a connecting component 5. The connecting component 5 is also used to install the outer protective component 4. A gap is provided between the heat-resistant steel pipe 1 and the outer sleeve 2, and the insulation filling component 3 is used to fill this gap. The insulation filling component 3 not only provides heat insulation, but also provides internal support for the outer sleeve 2 through the internal pressure-resistant layer 32. The detachable outer protective component 4 is installed on the outside of the outer sleeve 2. The outer protective component 4, through the cooperation of the ring clamp 41 and the pressure-resistant frame 42, can protect the outside of the outer sleeve 2. When it is damaged by external impacts, the outer protective component 4 and the pressure-resistant layer 32 can protect the pipeline from the inside out. At the same time, when the outer protective component 4 is damaged, it can be repaired or replaced without cutting off the pipeline, which improves the convenience of maintenance.
[0022] Please see Figure 1 - Figure 3The thermal insulation filling component 3 also includes a high-temperature buffer layer 31 and a thermal insulation layer 33. The high-temperature buffer layer 31 is sleeved on the surface of the heat-resistant steel pipe 1 and is made of flexible graphite foil. The thermal insulation layer 33 is disposed outside the pressure-resistant layer 32 and is made of aluminum foil reflective film.
[0023] The thermal insulation filling component 3 also includes a pad 34 and a moisture-proof sealing layer 35. The pad 34 is disposed outside the thermal insulation layer 33 and is made of fiberglass cloth. The moisture-proof sealing layer 35 is in close contact with the inner side of the outer sleeve 2 and is made of aluminum-magnesium alloy foil.
[0024] In this design, the high-temperature buffer layer 31 is wrapped around the outside of the heat-resistant steel pipe 1, mainly for heat insulation and buffering. The high-temperature buffer layer 31 is made of flexible graphite foil. The high-temperature buffer layer 31 can absorb the thermal expansion stress of the inner steel pipe and also play a buffering role, preventing the pressure-resistant layer 32 from directly contacting the heat-resistant steel pipe 1. The flexible graphite foil is resistant to high temperature and has strong chemical inertness. The high-temperature buffer layer 31 can also prevent heat from being directly transferred to the pressure-resistant layer 32. The pressure-resistant layer 32 is wrapped around the outside of the high-temperature buffer layer 31, mainly to support the outer sleeve 2 and also to provide heat insulation.
[0025] The insulation layer 33 covers the outside of the pressure-resistant layer 32. The insulation layer 33 is made of aluminum foil reflective film, which serves as the core heat insulation layer to minimize heat loss and prevent the loss of steam heat inside the heat-resistant steel pipe 1. A padding layer 34 is set outside the insulation layer 33. The padding layer 34 is made of fiberglass cloth. A moisture-proof sealing layer 35 is set outside the padding layer 34. The moisture-proof sealing layer 35 is made of aluminum-magnesium alloy foil. By setting the padding layer 34 between the insulation layer 33 and the moisture-proof sealing layer 35, the insulation layer 33 and the moisture-proof sealing layer 35 can be prevented from sticking together. At the same time, the padding layer 34 can also increase the structural strength of the insulation layer 33 and the moisture-proof sealing layer 35, preventing them from cracking under stress. The moisture-proof sealing layer 35 encloses the high-temperature buffer layer 31, the pressure-resistant layer 32, the heat insulation layer 33, and the padding layer 34. Its main function is to isolate and seal the layers. When the outer tube 2 is damaged, it prevents moisture and other substances from entering the heat insulation filling component 3, thus preventing performance degradation and providing protection.
[0026] Please see Figure 2 and Figure 4 The pressure-resistant layer 32 includes splicing blocks 321, which are arc-shaped. One end of the splicing block 321 is fixedly installed with an installation block 323, and the other end of the splicing block 321 is provided with an installation groove 322 that is adapted to the installation block 323. Multiple splicing blocks 321 are connected through the installation block 323 and the installation groove 322. The splicing block 321 is made of microporous calcium silicate hard shell material.
[0027] The compressive layer 32 in this solution is mainly made of splicing block 321, which is made of microporous calcium silicate hard shell material. Microporous calcium silicate is an inorganic material widely used in the field of high temperature insulation. Its unique physical structure gives it excellent compressive strength, temperature resistance and heat insulation performance. It contains uniformly distributed micron-sized closed pores with a diameter of 10-50nm. The closed pore structure effectively blocks gas convection and heat conduction, while avoiding moisture penetration. At the same time, its high compressive strength can withstand external soil pressure or mechanical load, preventing the outer jacket 2 from being damaged and dented.
[0028] Each set of pressure-resistant layers 32 consists of three splicing blocks 321. The splicing blocks 321 are arc-shaped, that is, one-third of a circle. The three splicing blocks 321 are spliced together in a ring to install on the outside of the heat-resistant steel pipe 1. At both ends of the splicing blocks 321, mounting blocks 323 and mounting grooves 322 are respectively fixed. Therefore, by inserting the mounting blocks 323 into the mounting grooves 322 at the beginning and end of the multiple splicing blocks 321, the installation connection can be completed, and multiple sets of pressure-resistant layers 32 can be installed on the outside of the heat-resistant steel pipe 1.
[0029] Please see Figure 6 and Figure 7 The connecting component 5 includes a connecting ring 51, with annular grooves 53 on both sides of the connecting ring 51. The outer tube 2 has slots 6 at both ends. A retaining ring 54 is fixedly installed inside the annular groove 53. One end of the outer tube 2 extends into the annular groove 53, and the slot 6 and retaining ring 54 engage to form a connection.
[0030] A reinforcing rib 52 is fixedly installed on the outside of the connecting ring 51. The reinforcing rib 52 is used to prevent the connecting ring 51 from deforming.
[0031] In this design, the outer tube 2 is mainly connected via the connecting component 5. The connecting ring 51 is annular, with annular grooves 53 on both the upper and lower sides. The annular grooves 53 are adapted to the ports of the outer tube 2. Two retaining rings 54 are fixed inside the annular grooves 53. The ports of the outer tube 2 have retaining slots 6 on both the inner and outer sides. After the outer tube 2 is inserted into the annular groove 53, the retaining slots 6 and retaining rings 54 will engage, thus completing the initial fixation. Since both the connecting component 5 and the outer tube 2 are made of metal, they need to be welded together after installation to ensure a more secure connection and to provide waterproofing and improve sealing.
[0032] A retaining ring 54 is also fixed to the outside of the connecting ring 51. The retaining ring 54 is mainly used to improve the strength of the connecting ring 51 and prevent the connecting ring 51 from easily deforming under pressure, thereby improving its service life.
[0033] Please see Figure 5The outer protective component 4 also includes multiple reinforcing rings 43. The inner side of the reinforcing rings 43 is fixedly connected to multiple anti-compression frames 42. Both ends of the ring hoop 41 are fixedly installed with connecting blocks 44, which are installed on the outside of the connecting ring 51.
[0034] The outer protective component 4 in this solution is mainly used to protect the outside of the outer tube 2. Each section of the outer tube 2 needs to be used with two outer protective components 4. The two outer protective components 4 are connected together to completely surround the outside of the outer tube 2. Each outer protective component 4 consists of two rings 41. Multiple equidistant compression frames 42 are fixed between the two rings 41. Reinforcing rings 43 are also fixed to the outside of the multiple compression frames 42, so that they can form a cross-shaped structure to improve its structural strength. When the outer tube 2 is subjected to external mechanical impact, the outer protective component 4 can protect it.
[0035] Meanwhile, both ends of the ring clamp 41 are fixed with connecting blocks 44. The two outer protective components 4 can be connected together by using bolts. It is a detachable structure. When the outer protective component 4 is damaged, it can be replaced separately without affecting the main body of the pipeline, which is convenient for maintenance.
[0036] Working principle: When using this device to transport high-temperature steam, the heat-resistant steel pipe 1 is the conveying pipeline, and the high-temperature buffer layer 31 is wrapped around the outside of the heat-resistant steel pipe 1, mainly for heat insulation and buffering. The pressure-resistant layer 32 is made of microporous calcium silicate hard shell material and is located inside the outer sleeve 2, which plays a supporting role and prevents the structure of the outer sleeve 2 from being damaged and dented. The outer protective component 4 is mainly used to protect the outside of the outer sleeve 2. Multiple pressure-resistant frames 42 are fixed between the two rings 41, and reinforcing rings 43 are fixed on the outside of the multiple pressure-resistant frames 42 to form a horizontal and vertical crisscross structure. Through the cooperation of the outer protective component 4 and the pressure-resistant layer 32, the pipeline can be protected from the inside out.
Claims
1. A high-temperature resistant stainless steel pipe, comprising a heat-resistant steel pipe (1), characterized in that, Also includes: Multiple outer sleeves (2) are sequentially fitted onto the outside of the heat-resistant steel pipe (1); The thermal insulation filling component (3) is located between the heat-resistant steel pipe (1) and the outer casing (2) to fill the gap. The thermal insulation filling component (3) includes multiple sets of pressure-resistant layers (32), which are located inside the outer casing (2). A connecting component (5) is used to connect multiple outer sleeves (2). The outer protective assembly (4) is sleeved on the outside of the outer sleeve (2). The outer protective assembly (4) includes two ring clamps (41), and multiple equidistantly distributed pressure-resistant frames (42) are fixedly installed between the two ring clamps (41). The outer protective component (4) protects the outside of the outer tube (2), and the pressure-resistant layer (32) supports the inside of the outer tube (2) to prevent it from sinking.
2. The high-temperature resistant stainless steel pipe according to claim 1, characterized in that: The thermal insulation filling component (3) further includes a high temperature buffer layer (31) and a thermal insulation layer (33). The high temperature buffer layer (31) is sleeved on the surface of the heat-resistant steel pipe (1) and is made of flexible graphite foil. The thermal insulation layer (33) is disposed outside the pressure-resistant layer (32) and is made of aluminum foil reflective film.
3. The high-temperature resistant stainless steel pipe according to claim 2, characterized in that: The thermal insulation filling component (3) further includes a pad (34) and a moisture-proof sealing layer (35). The pad (34) is disposed outside the thermal insulation layer (33) and is made of fiberglass cloth. The moisture-proof sealing layer (35) is attached to the inside of the outer tube (2) and is made of aluminum-magnesium alloy foil.
4. The high-temperature resistant stainless steel pipe according to claim 1, characterized in that: The pressure-resistant layer (32) includes a splicing block (321), which is arc-shaped. One end of the splicing block (321) is fixedly installed with an installation block (323), and the other end of the splicing block (321) is provided with an installation groove (322) that is compatible with the installation block (323). Multiple splicing blocks (321) are connected by the installation block (323) and the installation groove (322). The splicing block (321) is made of microporous calcium silicate hard shell material.
5. The high-temperature resistant stainless steel pipe according to claim 1, characterized in that: The connecting component (5) includes a connecting ring (51), with annular grooves (53) on both sides of the connecting ring (51). The outer sleeve (2) has slots (6) at both ends. A retaining ring (54) is fixedly installed inside the annular groove (53). One end of the outer sleeve (2) extends into the annular groove (53), and the slot (6) engages with the retaining ring (54) to form a connection.
6. The high-temperature resistant stainless steel pipe according to claim 5, characterized in that: The connecting ring (51) is fixedly fitted with a reinforcing rib (52) to prevent the connecting ring (51) from deforming.
7. A high-temperature resistant stainless steel pipe according to claim 6, characterized in that: The outer protective assembly (4) also includes multiple reinforcing rings (43), the inner side of which is fixedly connected to multiple pressure-resistant frames (42), and both ends of the ring hoop (41) are fixedly installed with connecting blocks (44), which are installed outside the connecting ring (51).