Prefabricated overhead composite thermal insulation pipe with long service life

Abstract

The utility model discloses a prefabricated overhead composite thermal insulation pipe with long service life, which comprises a working steel pipe, a soft buffer layer, inorganic hard thermal insulation pipes and an outer protective pipe which are coaxial with one another, the soft buffer layer is coated outside the working steel pipe, a plurality of inorganic hard thermal insulation pipes are sleeved outside the soft buffer layer after being connected end to end, and the outer protective pipe is sleeved outside the inorganic hard thermal insulation pipes. The inorganic hard heat preservation pipe is sleeved with the outer protection pipe, the space between the outer protection pipe and the inorganic hard heat preservation pipe is filled with the polyurethane heat preservation layer, the outer protection pipe is sleeved with the hoop, and the hoop is fixedly connected with the buttress arranged below the outer protection pipe. The soft buffer layer is arranged between the working steel pipe and the inorganic hard heat preservation pipe, the soft buffer layer can play a role in buffering thermal expansion and cold contraction of the working steel pipe, the inorganic hard heat preservation pipe is prevented from being broken when the working steel pipe is heated and expanded, and therefore the service life of the prefabricated overhead composite heat preservation pipe is prolonged. And the conveying cost of media such as high-temperature liquid and gas is reduced.

Description

Technical Field

[0001] This utility model relates to an internally sliding prefabricated overhead composite insulation pipe for conveying high-temperature liquids, gases and other media, belonging to the field of conveying technology. Background Technology

[0002] Insulated pipes are used for transporting liquids, gases, and other media, and are widely used in thermal insulation projects such as petrochemicals, district heating, central air conditioning, and municipal pipelines. Utility model patent application number CN202221221937.8 discloses a prefabricated overhead pipe composite insulation structure for transporting high-temperature heat media. It includes multiple ceramic fiber tubes made by centrifugally drying a mixture of ceramic fibers, inorganic binders, and water in a mold. Each ceramic fiber tube is sequentially connected end-to-end via a socket structure, and an integral polyurethane insulation layer is provided on the outer side of each ceramic fiber tube. The production process is as follows: the ceramic fiber tube is formed to the designed thickness in one step; an aluminum foil layer is adhered to the inner wall of the ceramic fiber tube; the inner diameter of the ceramic fiber tube is consistent with the outer diameter of the working steel pipe; the ceramic fiber tube is inserted into the working steel pipe and can slide smoothly; the spigot with a high-temperature resistant sealing ring is inserted into the socket of the adjacent ceramic fiber tube; the socket-type ceramic fiber tubes are connected to adjacent socket-type ceramic fiber tubes or socket-type high-strength ceramic fiber tubes through a socket-insertion method to form an integrated inorganic insulation layer; the polyurethane insulation layer is produced using a "pipe-in-pipe" production process; the outer protective pipe and the ceramic fiber tube insulation layer are respectively bonded to the polyurethane insulation layer to form a three-in-one structure with heat insulation and waterproof functions. This type of insulation pipe has the following defects:

[0003] 1. The inner diameter of the ceramic fiber tube is the same as the outer diameter of the working steel pipe. When transporting heat medium, the working steel pipe expands due to heat, increasing its diameter and causing compression on the inner wall of the ceramic fiber tube. This can easily lead to cracks or other damage to the ceramic fiber tube, seriously affecting the service life of the insulation pipeline.

[0004] Second, when transporting hot media, as the diameter of the working steel pipe increases and the ceramic fiber tube is tightened, axial displacement will also occur. At this time, the working steel pipe will apply a large axial friction force to the ceramic fiber tube, causing gaps or even separation between adjacent ceramic fiber tubes, which in turn will cause carbonization of the polyurethane insulation layer, reducing its insulation performance, shortening the service life of the insulated pipe, and thus increasing the transportation cost of high-temperature liquids, gases and other media. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a prefabricated overhead composite insulation pipe with a long service life, thereby reducing the transportation costs of high-temperature liquids, gases, and other media.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A long-service-life prefabricated overhead composite insulation pipe includes a coaxial working steel pipe, a soft buffer layer, an inorganic rigid insulation pipe, and an outer protective pipe. The soft buffer layer covers the outside of the working steel pipe. Multiple inorganic rigid insulation pipes are connected end to end and fitted onto the outside of the soft buffer layer. The outer protective pipe is fitted onto the outside of the inorganic rigid insulation pipe. A polyurethane insulation layer is filled between the outer protective pipe and the inorganic rigid insulation pipe. A clamp is fitted onto the outside of the outer protective pipe, and the clamp is fixedly connected to a support pier set below the outer protective pipe.

[0008] The aforementioned long-life prefabricated overhead composite insulation pipe has a reflective layer between the soft buffer layer and the inorganic rigid insulation pipe.

[0009] The aforementioned long-life prefabricated overhead composite insulation pipe has multiple sets of support frames arranged at equal intervals along its axial direction in the polyurethane insulation layer. Multiple support frames in each set are evenly distributed around the inorganic rigid insulation pipe. The outer end of the support frame abuts against the inner wall of the outer protective pipe, and the inner end abuts against the outer wall of the inorganic rigid insulation pipe.

[0010] The aforementioned long-life prefabricated overhead composite insulation pipe has a cylindrical boss at one end of each inorganic rigid insulation pipe and a groove at the other end that matches the boss. The boss of each inorganic rigid insulation pipe is inserted into the groove of the adjacent inorganic rigid insulation pipe and bonded together with sealant.

[0011] The aforementioned long-life prefabricated overhead composite insulation pipe has a reflective layer comprising two layers: an inner layer of aluminum foil and an outer layer of glass fiber.

[0012] The aforementioned long-life prefabricated overhead composite insulation pipe has polyurethane injection holes on the side wall of the outer protective pipe, which are sealed by heat fusion sealing.

[0013] The aforementioned long-life prefabricated overhead composite insulation pipe has a soft buffer layer made of aerogel felt or aluminum silicate needled blanket.

[0014] The aforementioned long-service-life prefabricated overhead composite insulation pipe has an outer protective pipe that is either a spiral duct or a polyethylene sleeve.

[0015] This invention incorporates a soft buffer layer between the working steel pipe and the inorganic rigid insulation pipe. This soft buffer layer can cushion the thermal expansion and contraction of the working steel pipe, preventing the inorganic rigid insulation pipe from cracking when the working steel pipe expands due to heat. This extends the service life of the prefabricated overhead composite insulation pipe and reduces the transportation cost of high-temperature liquids, gases, and other media. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram showing the connection between adjacent inorganic rigid insulation pipes;

[0019] Figure 3 This is a schematic diagram showing the distribution of the support frame around the inorganic rigid insulation pipe;

[0020] Figure 4 This is an installation diagram of this utility model.

[0021] The labels in the diagram are as follows: 1. Reflective layer, 2. Working steel pipe, 3. Soft buffer layer, 4. Inorganic rigid insulation pipe, 4-1. Boss, 4-2. Groove, 5. Support frame, 6. Hot melt sealing, 7. Polyurethane insulation layer, 8. Outer protective pipe, 9. Clamp, 10. Precast overhead composite insulation pipe, 11. Support pier. Detailed Implementation

[0022] See Figures 1-4 The present invention mainly includes a working steel pipe 2 and, from the inside out, a soft buffer layer 3, a reflective layer 1, an inorganic rigid insulation pipe 4, a polyurethane insulation layer 7, and an outer protective pipe 8, which are sequentially fitted around the outside of the working steel pipe 2.

[0023] The working steel pipe 2 is used to transport high-temperature liquids, gases, and other media. Its outer surface is covered with a soft buffer layer 3 by binding. The soft buffer layer 3 is made of soft insulation materials such as aerogel felt and aluminum silicate needled blanket, which buffers the thermal expansion and contraction of the working steel pipe 2, preventing the working steel pipe 2 from exerting a large radial force on the inorganic rigid insulation pipe 4 when it expands due to heat, thus protecting the safety of the inorganic rigid insulation pipe 4 and extending its service life. A reflective layer 1 is covered on the outer surface of the soft buffer layer 3. Multiple inorganic rigid insulation pipes 4 are inserted into the soft buffer layer 3. The multiple inorganic rigid insulation pipes 4 are connected end to end by adhesive. The gap between the inorganic rigid insulation pipe 4 and the outer protective pipe 8 is filled with a polyurethane insulation layer 7. A support frame 5 is set in the polyurethane insulation layer 7, which abuts against the outer protective pipe 8 and the inorganic rigid insulation pipe 4.

[0024] The reflective layer 1 consists of two layers, an inner and an outer layer. The inner layer (the part in contact with the soft buffer layer 3) is made of aluminum foil, which can reduce heat loss caused by high-temperature radiation. The outer layer is made of glass fiber, which has a smooth surface and can reduce the axial friction between the inorganic rigid insulation pipe 4 and the soft buffer layer 3, prevent gaps between adjacent inorganic rigid insulation pipes, avoid carbonization of the polyurethane insulation layer 7, extend the service life of the insulation pipe, and reduce the transportation cost of high-temperature liquids, gases and other media.

[0025] See Figure 2The adjacent inorganic rigid insulation pipes 4 are connected end to end by a plug-in method. Each inorganic rigid insulation pipe 4 has a cylindrical boss 4-1 at one end and a groove 4-2 that matches the boss 4-1 at the other end. The boss 4-1 of each inorganic rigid insulation pipe 4 is inserted into the groove 4-2 of the adjacent inorganic rigid insulation pipe 4 and bonded together with high temperature resistant sealant to achieve seamless axial splicing and good sealing effect.

[0026] See Figure 1 The outer protective tube 8 has a polyurethane injection hole on its side wall, which can be used to form a polyurethane insulation layer 7 by injecting polyurethane. The injection hole is then sealed by heat-melting sealing 6.

[0027] The outer protective pipe 8 is made of spiral duct or polyethylene sleeve.

[0028] See Figure 4 The precast overhead composite insulation pipe 10 is supported by the support 11, and the precast overhead composite insulation pipe 10 is provided with a clamp 9 on the outside, which is fixedly connected to the support 11.

[0029] Advantages of this utility model:

[0030] The polyurethane insulation layer 7 tightly bonds the inorganic rigid insulation pipe 4 and the outer protective pipe 8 together to form a three-in-one structure. During pipeline operation, the insulation layer and the outer protective pipe do not move, only the working steel pipe 2 moves, making the pipeline network operation more stable. The inorganic rigid insulation pipe 4 has a uniform thickness and does not need to be wrapped layer by layer, making the production process simple.

[0031] The inorganic rigid insulation pipe 4 is integrally molded with no axial overlap. Adjacent insulation pipe shells are bonded together with adhesive, and there is no circumferential overlap. The inorganic rigid insulation pipe 4 is seamlessly connected, reducing the possibility of heat loss from gaps and resulting in more significant energy-saving effects.

[0032] A soft buffer layer 3 was added so that the working steel pipe 2 would not be subjected to excessive pressure on the inorganic rigid insulation pipe 4 after high-temperature expansion, thus preventing damage to the inorganic rigid insulation pipe 4.

[0033] An aluminum foil reflective layer 1 is set between the soft buffer layer 3 and the inorganic rigid insulation pipe 4, which can reduce the friction between the inorganic rigid insulation pipe 4 and the soft buffer layer 3. The relative displacement of the working steel pipe 2 caused by thermal expansion and contraction is smoother, and the internal sliding is truly realized. This reduces the load on the support 11 that supports the overall insulation pipe, making the pipeline network operation safer.

[0034] The support 11 contacts the outer protective pipe 8 of the prefabricated overhead composite insulation pipe 10 through the clamp 9, instead of directly contacting the working steel pipe 2, which reduces the thermal bridge effect, results in less heat loss, and has a better energy-saving effect.

Claims

1. A prefabricated overhead composite insulation pipe with a long service life, characterized in that, The system includes a coaxial working steel pipe (2), a soft buffer layer (3), an inorganic rigid insulation pipe (4), and an outer protective pipe (8). The soft buffer layer (3) covers the outside of the working steel pipe (2). Multiple inorganic rigid insulation pipes (4) are connected end to end and fitted onto the outside of the soft buffer layer (3). The outer protective pipe (8) is fitted onto the outside of the inorganic rigid insulation pipe (4). A polyurethane insulation layer (7) is filled between the outer protective pipe (8) and the inorganic rigid insulation pipe (4). A clamp (9) is fitted onto the outside of the outer protective pipe (8). The clamp (9) is fixedly connected to a support (11) located below the outer protective pipe (8).

2. The prefabricated overhead composite insulation pipe with long service life according to claim 1, characterized in that, A reflective layer (1) is provided between the soft buffer layer (3) and the inorganic rigid insulation pipe (4).

3. A prefabricated overhead composite insulation pipe with a long service life according to claim 1 or 2, characterized in that, The polyurethane insulation layer (7) is provided with multiple sets of support frames (5) arranged at equal intervals along its axial direction. Multiple support frames (5) in each set of support frames (5) are evenly distributed around the inorganic rigid insulation pipe (4). The outer end of the support frame (5) abuts against the inner wall of the outer protective pipe (8), and the inner end abuts against the outer wall of the inorganic rigid insulation pipe (4).

4. The prefabricated overhead composite insulation pipe with long service life according to claim 3, characterized in that, Each inorganic rigid insulation tube (4) has a cylindrical boss (4-1) at one end and a groove (4-2) matching the boss (4-1) at the other end. The boss (4-1) of each inorganic rigid insulation tube (4) is inserted into the groove (4-2) of the adjacent inorganic rigid insulation tube (4) and bonded together with sealant.

5. A prefabricated overhead composite insulation pipe with a long service life according to claim 2, characterized in that, The reflective layer (1) consists of two layers, an inner layer of aluminum foil and an outer layer of glass fiber.

6. A prefabricated overhead composite insulation pipe with a long service life according to claim 4, characterized in that, The outer protective tube (8) has a polyurethane injection hole on its side wall, which is sealed by heat-melting plug (6).

7. A prefabricated overhead composite insulation pipe with a long service life according to claim 1, characterized in that, The soft buffer layer (3) is an aerogel felt or an aluminum silicate needled blanket.

8. A prefabricated overhead composite insulation pipe with a long service life according to claim 1, characterized in that, The outer protective tube (8) is a spiral duct or a polyethylene sleeve.

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