Anti-corrosion heat insulation polyurethane heat preservation pipe

Abstract

The utility model discloses an anti-corrosion heat insulation polyurethane heat preservation pipe, and belongs to the technical field of pipeline heat preservation. The thermal insulation pipe comprises an inner pipe and an outer pipe, a thermal insulation layer is arranged between the inner pipe and the outer pipe, an adjustable positioning support is further arranged between the inner pipe and the outer pipe, the inner end and the outer end of the adjustable positioning support abut against the outer wall of the inner pipe and the inner wall of the outer pipe respectively, and an anti-corrosion layer is arranged on the outer side of the outer pipe. The adjustable positioning support comprises two annular supporting frames and a horizontal connecting rod connecting the two annular supporting frames, each annular supporting frame comprises four adjusting supports distributed annularly, each adjusting support is composed of an inner supporting block, an outer supporting block and an adjusting assembly, and each adjusting assembly comprises a threaded rod and a rotating rod. Accurate positioning between the inner pipe and the outer pipe is achieved through the adjustable positioning support, it is guaranteed that the thickness of the heat preservation layer is uniform, the heat preservation effect is improved, and meanwhile the service life of the pipeline is effectively prolonged through the anti-corrosion layer.

Description

Technical Field

[0001] This invention relates to the field of pipeline insulation, specifically to a corrosion-resistant and heat-insulating polyurethane insulation pipe. Background Technology

[0002] Polyurethane insulated pipes are a commonly used type of insulated pipe, widely used in petroleum, chemical, heating, and water supply industries. Currently, most polyurethane insulated pipes on the market typically consist of three parts: an inner pipe, an insulation layer, and an outer pipe. The inner pipe serves as the channel for transporting the medium, the outer pipe provides protection, and the insulation layer fills the space between the inner and outer pipes, providing thermal insulation. To improve the service life and performance of the insulated pipe, some pipes also have an anti-corrosion layer on the surface of the outer pipe to enhance its resistance to corrosion.

[0003] In existing technologies, to ensure the stability of the inner tube's position within the outer tube, a support structure is typically installed between the inner and outer tubes. For example, Chinese patent CN214699571U discloses a high-sealing prefabricated direct-buried insulated pipe, which incorporates a buffer structure between the inner and outer tubes, providing a certain degree of cushioning and preventing deformation or damage to the inner tube due to external pressure. Chinese patent CN214146876U discloses a wear-resistant polyurethane insulated pipe, which incorporates support rods, springs, and top rods within the polyurethane insulation layer. When the outer tube transmits external stress to the polyurethane insulation layer, the support rods and top rods provide support, and the springs, when compressed, also provide elastic support through their own restoring force.

[0004] In addition, to improve the insulation effect and corrosion resistance of insulated pipes, Chinese patent CN215488099U discloses a polyurethane insulated pipe that can avoid insulation leaks. Its outer casing includes an anti-corrosion layer, an explosion-proof and crack-resistant layer inside the anti-corrosion layer, and a polyurethane insulation layer inside the explosion-proof and crack-resistant layer. Both ends of the polyurethane insulation layer are connected to a leak-proof insulation layer 4. Chinese patent CN202580335U discloses a direct-buried insulated pipe with an inner anti-corrosion layer. This anti-corrosion layer is placed between the insulation layer and the inner pipe and is attached to the outer wall of the inner pipe, effectively protecting the pipe from corrosion. Chinese patent CN222458690U discloses a pressure-resistant polyurethane insulated pipe, including an inner pipe and an outer pipe. The inner pipe has an inner insulation layer inside, a reinforcing layer outside the inner insulation layer, and also includes a buffer mechanism and a pressure-resistant mechanism 5.

[0005] However, existing insulated pipe technologies suffer from the following problems: the support structure between the inner and outer pipes is typically a fixed design, making it impossible to adjust for different pipe sizes. This means that a single support size can only be used with a specific combination of inner and outer pipes. When the dimensions of the inner and outer pipes change, the support needs to be redesigned and manufactured, increasing production costs and inventory management difficulties. Furthermore, fixed supports make it difficult to precisely control the centering position of the inner pipe within the outer pipe, easily leading to uneven insulation layer thickness and affecting insulation performance. In addition, because the supports are not adjustable, thermal expansion and contraction due to temperature changes can cause excessive stress between the support and the pipe wall, increasing the risk of pipe damage.

[0006] Therefore, there is an urgent need for a polyurethane insulation pipe with adjustable supports between the inner and outer tubes to accommodate different specifications of inner and outer tube combinations, thereby improving the applicability and performance of the insulation pipe. Utility Model Content

[0007] The purpose of this utility model is to address the above-mentioned problems by providing a corrosion-resistant and heat-insulating polyurethane insulation pipe.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A corrosion-resistant and heat-insulating polyurethane insulation pipe includes an inner pipe and an outer pipe, with an insulation layer between the inner and outer pipes. An adjustable positioning bracket is also provided between the inner and outer pipes, with the inner and outer ends of the adjustable positioning bracket abutting against the outer wall of the inner pipe and the inner wall of the outer pipe, respectively. An anti-corrosion layer is also provided on the outer side of the outer pipe.

[0010] In the aforementioned anti-corrosion and heat-insulating polyurethane insulation pipe, the adjustable positioning bracket includes two annular support frames and several horizontal connecting rods connecting the two annular support frames.

[0011] In the aforementioned anti-corrosion and heat-insulating polyurethane insulation pipe, the annular support frame includes four adjustable supports arranged in a ring. Each adjustable support consists of an inner support block, an outer support block, and an adjusting component. The inner and outer support blocks abut against the outer wall of the inner pipe and the inner wall of the outer pipe, respectively. The inner and outer ends of the adjusting component are connected to the inner and outer support blocks, respectively. The four inner support blocks are fixedly connected by an arc-shaped connecting rod.

[0012] In the aforementioned anti-corrosion and heat-insulating polyurethane insulation pipe, the adjusting component includes a threaded rod fixedly connected to the inner support block and a rotating rod rotatably connected to the outer support block. The rotating rod is provided with a threaded groove that is screwed to the threaded rod.

[0013] In the aforementioned anti-corrosion and heat-insulating polyurethane insulation pipe, a strong connection structure is also provided on the inner and outer pipes.

[0014] In the aforementioned anti-corrosion and heat-insulating polyurethane insulation pipe, the strong connection structure includes several inner grooves recessed inward on the outer wall of the inner pipe and an outer groove recessed inward on the inner wall of the outer pipe.

[0015] In the aforementioned anti-corrosion and heat-insulating polyurethane pipe, the anti-corrosion layer is a polytetrafluoroethylene coating.

[0016] In the aforementioned anti-corrosion and heat-insulating polyurethane insulated pipe, the outer pipe is a plastic pipe.

[0017] In the aforementioned anti-corrosion and heat-insulating polyurethane insulated pipe, the inner pipe is a steel pipe.

[0018] In the aforementioned anti-corrosion and heat-insulating polyurethane insulated pipe, the insulation layer is made of foamed polyurethane.

[0019] Compared with existing technologies, the advantages of this utility model are:

[0020] 1. By setting an adjustable positioning bracket between the inner and outer tubes, the bracket between the inner and outer tubes can be adjusted as needed, so that the inner tube can be adapted to outer tubes of more sizes, effectively solving the problem that the bracket between the inner and outer tubes of the insulation pipe cannot be adjusted in the existing technology.

[0021] 2. The adjustable positioning bracket design increases the range of outer tube sizes that the inner tube can be adapted to, improving the applicability and practical value of the insulation pipe.

[0022] 3. The combination design of the ring support frame and the adjusting bracket enables precise adjustment of the distance between the inner and outer tubes, ensuring the uniformity of the insulation layer and the insulation effect.

[0023] 4. The strong connection structure enhances the connection strength between the inner and outer pipes, and the application of the anti-corrosion layer improves the corrosion resistance of the insulation pipe, further extending the service life of the product.

[0024] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the present invention;

[0026] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 This is a schematic diagram of the internal structure of this utility model. Detailed Implementation

[0028] Example 1

[0029] like Figures 1-3 As shown, a corrosion-resistant and heat-insulating polyurethane insulation pipe includes an inner pipe 1 and an outer pipe 2. An insulation layer 3 is provided between the inner pipe 1 and the outer pipe 2. An adjustable positioning bracket 4 is also provided between the inner pipe 1 and the outer pipe 2. The inner and outer ends of the adjustable positioning bracket 4 abut against the outer wall of the inner pipe 1 and the inner wall of the outer pipe 2, respectively. An anti-corrosion layer 5 is also provided on the outer side of the outer pipe 2.

[0030] Specifically, the inner tube is made of steel, the outer tube is made of plastic, the insulation layer is made of polyurethane foam, and the anti-corrosion layer is a polytetrafluoroethylene coating. The insulation layer between the inner and outer tubes effectively insulates against heat loss, improving the insulation effect. Adjustable positioning brackets allow adjustment of the relative positions of the inner and outer tubes, ensuring the inner tube is centered on the outer tube and that the insulation layer is evenly distributed between them, further enhancing the insulation effect. The anti-corrosion layer on the outer side of the outer tube effectively prevents external corrosive substances from eroding the insulation pipe, extending its service life.

[0031] The adjustable positioning bracket 4 includes two annular support frames 6 and several horizontal connecting rods 7 connecting the two annular support frames 6. The two annular support frames are respectively set at both ends of the insulation pipe and connected by several horizontal connecting rods to form a stable support structure, which can effectively support the inner pipe and the outer pipe and ensure that the inner pipe is located in the center position of the outer pipe. The number of horizontal connecting rods can be set according to actual needs, generally 4-8, evenly distributed around the circumference of the annular support frames.

[0032] The annular support frame 6 includes four adjusting brackets 8 arranged in a ring. Each adjusting bracket 8 consists of an inner support block 9, an outer support block 10, and an adjusting assembly. The inner support block 9 and the outer support block 10 abut against the outer wall of the inner tube 1 and the inner wall of the outer tube 2, respectively. The inner and outer ends of the adjusting assembly are connected to the inner support block 9 and the outer support block 10, respectively. The four inner support blocks 9 are fixedly connected by an arc-shaped connecting rod 11. The four adjusting brackets are evenly distributed in a ring, effectively supporting the inner and outer tubes and ensuring that the inner tube is centered on the outer tube. The inner and outer support blocks abut against the outer wall of the inner tube and the inner wall of the outer tube, respectively. The distance between the inner and outer support blocks is adjusted by the adjusting assembly, thereby adjusting the relative position between the inner and outer tubes. The four inner support blocks are fixedly connected by an arc-shaped connecting rod, forming a stable annular structure that effectively supports the inner tube.

[0033] The adjustment assembly includes a threaded rod 12 fixedly connected to the inner support block 9 and a rotating rod 13 rotatably connected to the outer support block 10. The rotating rod 13 has a threaded groove 14 that is threaded to the threaded rod 12. By rotating the rotating rod, the threaded rod moves within the threaded groove, thereby adjusting the distance between the inner and outer support blocks, and consequently adjusting the relative position between the inner and outer tubes. The rotating rod's rotatable connection to the outer support block facilitates rotational operation. The threaded rod's fixed connection to the inner support block allows it to move, thus adjusting the position of the inner tube.

[0034] The inner tube 1 and outer tube 2 are also equipped with a strong connection structure. This strong connection structure includes several inwardly recessed grooves 15 on the outer wall of the inner tube 1 and inwardly recessed grooves 16 on the inner wall of the outer tube 2. The inward and outward grooves increase the contact area between the inner and outer tubes and the insulation layer, improving the connection strength and preventing separation of the inner and outer tubes from the insulation layer. The number of inward and outward grooves can be set according to actual needs, generally 8-16, evenly distributed around the circumference of the inner and outer tubes. The depth of the inward and outward grooves is generally 1-3mm, the width is generally 5-10mm, and the length can be set according to actual needs.

[0035] The fifth anti-corrosion layer is a polytetrafluoroethylene (PTFE) coating. PTFE has excellent corrosion resistance, effectively preventing external corrosive substances from eroding the insulation pipe and extending its service life. The PTFE coating thickness is generally 0.1-0.5 mm, effectively preventing erosion by external corrosive substances.

[0036] Outer tube 2 is a plastic tube. Plastic tubes have advantages such as light weight, corrosion resistance, and ease of processing, making them suitable as outer tubes for insulation pipes. The material of the plastic tube can be polyethylene, polypropylene, polyvinyl chloride, etc., selected according to the actual usage environment. The wall thickness of the plastic tube is generally 2-5mm, providing sufficient strength and rigidity.

[0037] Inner pipe 1 is made of steel. Steel pipes have advantages such as high strength, good rigidity, and high temperature resistance, making them suitable as inner pipes for insulation systems. The material of the steel pipe can be carbon steel, stainless steel, etc., selected according to the actual usage environment. The wall thickness of the steel pipe is generally 3-8mm, enabling it to withstand high pressure and temperature.

[0038] Insulation layer 3 is made of expanded polyurethane foam. Expanded polyurethane foam has excellent thermal insulation properties, low thermal conductivity, and can effectively insulate against heat loss. The density of expanded polyurethane foam is generally 35-45 kg / m³. 3 Its thermal conductivity is generally 0.022-0.028 W / (m·K), providing good insulation. The thickness of the insulation layer is generally 20-50 mm, depending on actual needs.

[0039] In practical applications, appropriate materials for the inner and outer tubes, insulation layer thickness, and anti-corrosion layer can be selected according to specific needs to meet the requirements of different environments. For example, in high-temperature environments, high-temperature resistant inner tube and insulation layer materials can be selected; in highly corrosive environments, more corrosion-resistant anti-corrosion layer materials can be selected.

[0040] This embodiment of the anti-corrosion and heat-insulating polyurethane insulated pipe, by setting an insulation layer and an adjustable positioning bracket between the inner and outer pipes, and setting an anti-corrosion layer on the outside of the outer pipe, can effectively insulate and prevent corrosion, improve the insulation effect, and extend the service life. The adjustable positioning bracket can adjust the relative position between the inner and outer pipes, ensuring that the inner pipe is located in the center of the outer pipe, so that the insulation layer is evenly distributed between the inner and outer pipes, improving the insulation effect. The strong connection structure can increase the connection strength between the inner and outer pipes and the insulation layer, preventing the inner and outer pipes from separating from the insulation layer.

[0041] Example 2

[0042] A corrosion-resistant and heat-insulating polyurethane insulation pipe includes an inner pipe and an outer pipe, with an insulation layer between the inner and outer pipes. An adjustable positioning bracket is also provided between the inner and outer pipes, with the inner and outer ends of the adjustable positioning bracket abutting against the outer wall of the inner pipe and the inner wall of the outer pipe, respectively. An anti-corrosion layer is also provided on the outer side of the outer pipe.

[0043] Unlike Embodiment 1, the adjustable positioning bracket in this embodiment includes three annular support frames and several horizontal connecting rods connecting the three annular support frames. The three annular support frames are respectively positioned at both ends and the middle of the insulation pipe, and are connected by several horizontal connecting rods to form a more stable support structure. This structure can more effectively support the inner and outer pipes, ensuring that the inner pipe is centered on the outer pipe. The number of horizontal connecting rods can be set according to actual needs, generally 6-12, evenly distributed around the circumference of the annular support frames.

[0044] The annular support frame comprises six adjustable supports arranged in a ring. Each adjustable support consists of an inner support block, an outer support block, and an adjusting assembly. The inner and outer support blocks abut against the outer wall of the inner tube and the inner wall of the outer tube, respectively. The inner and outer ends of the adjusting assembly are connected to the inner and outer support blocks, respectively. The six inner support blocks are fixedly connected by arc-shaped connecting rods. The six adjustable supports are evenly distributed in a ring, which can more effectively support the inner and outer tubes and ensure that the inner tube is centered in the outer tube. The inner and outer support blocks abut against the outer wall of the inner tube and the inner wall of the outer tube, respectively. The distance between the inner and outer support blocks is adjusted by the adjusting assembly, thereby adjusting the relative position between the inner and outer tubes. The six inner support blocks are fixedly connected by arc-shaped connecting rods, forming a more stable annular structure that can more effectively support the inner tube.

[0045] The adjusting assembly includes a threaded rod fixedly connected to the inner support block and a rotating rod rotatably connected to the outer support block. The rotating rod has a threaded groove that is threaded to the threaded rod. By rotating the rotating rod, the threaded rod moves within the threaded groove, thereby adjusting the distance between the inner and outer support blocks, and thus adjusting the relative position between the inner and outer tubes. The rotating rod's rotatable connection to the outer support block facilitates rotational operation. The threaded rod's fixed connection to the inner support block allows it to move, thereby adjusting the position of the inner tube.

[0046] The inner and outer tubes are also equipped with a strong connection structure. This strong connection structure includes several inwardly recessed grooves on the outer wall of the inner tube and an inwardly recessed groove on the inner wall of the outer tube. These grooves increase the contact area between the inner and outer tubes and the insulation layer, improving the connection strength and preventing separation. The number of grooves can be customized, typically 12-24, evenly distributed circumferentially on both the inner and outer tubes. The depth of the grooves is generally 1.5-3.5 mm, the width is generally 6-12 mm, and the length can be customized as needed.

[0047] The anti-corrosion layer is an epoxy resin coating. Epoxy resin has excellent corrosion resistance and adhesion, effectively preventing external corrosive substances from eroding the insulation pipe and extending its service life. The thickness of the epoxy resin coating is generally 0.2-0.6mm, effectively preventing the erosion of external corrosive substances.

[0048] The outer tube is made of fiberglass reinforced plastic (FRP). FRP pipes are lightweight, high-strength, and corrosion-resistant, making them suitable as the outer tube for insulation pipes. The wall thickness of FRP pipes is generally 3-6mm, providing sufficient strength and rigidity.

[0049] The inner tube is made of stainless steel. Stainless steel has advantages such as corrosion resistance and high temperature resistance, making it suitable as the inner tube of insulation pipes. The wall thickness of stainless steel pipes is generally 2-6mm, which can withstand high pressure and temperature.

[0050] The insulation layer is made of rigid polyurethane foam. Rigid polyurethane foam has excellent thermal insulation properties, low thermal conductivity, and can effectively insulate against heat loss. The density of rigid polyurethane foam is generally 40-50 kg / m³, and the thermal conductivity is generally 0.020-0.025 W / (m·K), providing better insulation performance. The thickness of the insulation layer is generally 25-60 mm, depending on actual needs.

[0051] This embodiment of the anti-corrosion and heat-insulating polyurethane insulated pipe, by setting an insulation layer and an adjustable positioning bracket between the inner and outer pipes, and setting an anti-corrosion layer on the outside of the outer pipe, can effectively insulate and prevent corrosion, improve the insulation effect, and extend the service life. The adjustable positioning bracket can adjust the relative position between the inner and outer pipes, ensuring that the inner pipe is located in the center of the outer pipe, so that the insulation layer is evenly distributed between the inner and outer pipes, improving the insulation effect. The strong connection structure can increase the connection strength between the inner and outer pipes and the insulation layer, preventing the inner and outer pipes from separating from the insulation layer.

[0052] Example 3

[0053] A corrosion-resistant and heat-insulating polyurethane insulation pipe includes an inner pipe and an outer pipe, with an insulation layer between the inner and outer pipes. An adjustable positioning bracket is also provided between the inner and outer pipes, with the inner and outer ends of the adjustable positioning bracket abutting against the outer wall of the inner pipe and the inner wall of the outer pipe, respectively. An anti-corrosion layer is also provided on the outer side of the outer pipe.

[0054] Unlike Embodiments 1 and 2, the adjustable positioning bracket in this embodiment includes four annular support frames and several horizontal connecting rods connecting the four annular support frames. The four annular support frames are evenly distributed along the length of the insulation pipe and connected by several horizontal connecting rods to form a more stable support structure, which can more effectively support the inner and outer pipes and ensure that the inner pipe is located in the center of the outer pipe. The number of horizontal connecting rods can be set according to actual needs, generally 8-16, evenly distributed around the circumference of the annular support frames.

[0055] The annular support frame comprises eight adjustable supports arranged in a ring. Each adjustable support consists of an inner support block, an outer support block, and an adjusting assembly. The inner and outer support blocks abut against the outer wall of the inner tube and the inner wall of the outer tube, respectively. The inner and outer ends of the adjusting assembly are connected to the inner and outer support blocks, respectively. The eight inner support blocks are fixedly connected by arc-shaped connecting rods. The eight adjustable supports are evenly distributed in a ring, which can more effectively support the inner and outer tubes and ensure that the inner tube is centered in the outer tube. The inner and outer support blocks abut against the outer wall of the inner tube and the inner wall of the outer tube, respectively. The distance between the inner and outer support blocks is adjusted by the adjusting assembly, thereby adjusting the relative position between the inner and outer tubes. The eight inner support blocks are fixedly connected by arc-shaped connecting rods, forming a more stable annular structure that can more effectively support the inner tube.

[0056] The adjusting assembly includes a threaded rod fixedly connected to the inner support block and a rotating rod rotatably connected to the outer support block. The rotating rod has a threaded groove that is threaded to the threaded rod. By rotating the rotating rod, the threaded rod moves within the threaded groove, thereby adjusting the distance between the inner and outer support blocks, and thus adjusting the relative position between the inner and outer tubes. The rotating rod's rotatable connection to the outer support block facilitates rotational operation. The threaded rod's fixed connection to the inner support block allows it to move, thereby adjusting the position of the inner tube.

[0057] The inner and outer tubes are also equipped with a strong connection structure. This structure includes several inwardly recessed grooves on the outer wall of the inner tube and an inwardly recessed groove on the inner wall of the outer tube. These grooves increase the contact area between the inner and outer tubes and the insulation layer, improving the connection strength and preventing separation. The number of grooves can be customized, typically 16-32, evenly distributed circumferentially on both the inner and outer tubes. The depth of the grooves is generally 2-4 mm, the width is generally 7-14 mm, and the length can be adjusted as needed.

[0058] The anti-corrosion layer is a polyurethane coating. Polyurethane has excellent corrosion resistance and adhesion, effectively preventing external corrosive substances from eroding the insulation pipe and extending its service life. The thickness of the polyurethane coating is generally 0.3-0.8mm, effectively preventing the erosion of external corrosive substances.

[0059] The outer tube is made of aluminum alloy. Aluminum alloy tubes have advantages such as light weight, high strength, and corrosion resistance, making them suitable as the outer tube for insulation pipes. The wall thickness of aluminum alloy tubes is generally 2-5mm, providing sufficient strength and rigidity.

[0060] The inner tube is made of copper. Copper tubes have advantages such as good thermal conductivity and corrosion resistance, making them suitable as inner tubes for insulation pipes. The wall thickness of copper tubes is generally 1-4mm, which allows them to withstand high pressure and temperature.

[0061] The insulation layer is made of phenolic foam. Phenolic foam has excellent thermal insulation and flame retardant properties, low thermal conductivity, and can effectively insulate against heat loss. The density of phenolic foam is generally 45-55 kg / m³, and the thermal conductivity is generally 0.025-0.030 W / (m·K), providing good insulation performance. The thickness of the insulation layer is generally 30-70 mm, depending on actual needs.

[0062] This embodiment of the anti-corrosion and heat-insulating polyurethane insulated pipe, by setting an insulation layer and an adjustable positioning bracket between the inner and outer pipes, and setting an anti-corrosion layer on the outside of the outer pipe, can effectively insulate and prevent corrosion, improve the insulation effect, and extend the service life. The adjustable positioning bracket can adjust the relative position between the inner and outer pipes, ensuring that the inner pipe is located in the center of the outer pipe, so that the insulation layer is evenly distributed between the inner and outer pipes, improving the insulation effect. The strong connection structure can increase the connection strength between the inner and outer pipes and the insulation layer, preventing the inner and outer pipes from separating from the insulation layer.

[0063] It should be noted that Embodiment 1, Embodiment 2, and Embodiment 3 are all types of corrosion-resistant and heat-insulating polyurethane insulation pipes.

[0064] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A corrosion and thermal insulation polyurethane pipe comprising an inner pipe (1) and an outer pipe (2), characterized in that, The inner tube (1) and the outer tube (2) are provided with a heat preservation layer (3), and the inner tube (1) and the outer tube (2) are further provided with adjustable positioning supports (4), the inner and outer ends of the adjustable positioning supports (4) are respectively in abutment with the outer wall of the inner tube (1) and the inner wall of the outer tube (2), and the outer side of the outer tube (2) is further provided with an anti-corrosion layer (5).

2. The corrosion resistant insulated polyurethane pipe of claim 1, wherein, The adjustable positioning supports (4) comprise two annular support frames (6) and a plurality of horizontal connecting rods (7) connecting the two annular support frames (6).

3. The corrosion resistant insulated polyurethane pipe of claim 2, wherein, The annular support frame (6) comprises four annularly distributed adjusting supports (8), the adjusting support (8) is composed of an inner support block (9), an outer support block (10) and an adjusting assembly, the inner and outer ends of the adjusting assembly are respectively connected with the inner support block (9) and the outer support block (10), and the four inner support blocks (9) are fixedly connected through arc-shaped connecting rods (11).

4. The corrosion resistant insulated polyurethane foam pipe according to claim 3, wherein, The adjusting assembly comprises a threaded rod (12) fixedly connected with the inner support block (9) and a rotating rod (13) rotatably connected with the outer support block (10), and the rotating rod (13) is provided with a threaded groove (14) screwing with the threaded rod (12).

5. The corrosion resistant insulated polyurethane pipe according to any one of claims 1-4, characterized in that, The inner tube (1) and the outer tube (2) are further provided with a strong connection structure.

6. The corrosion resistant insulated polyurethane foam pipe according to claim 5, wherein, The strong connection structure comprises a plurality of inner recesses (15) recessed inwardly on the outer wall of the inner tube (1) and outer recesses (16) recessed inwardly on the inner wall of the outer tube (2).

7. The corrosion resistant insulated polyurethane pipe according to any one of claims 1-4, characterized in that, The anti-corrosion layer (5) is a polytetrafluoroethylene coating.

8. The corrosion resistant insulated polyurethane pipe according to any one of claims 1-4, wherein, The outer tube (2) is a plastic tube.

9. The corrosion resistant insulated polyurethane pipe according to any one of claims 1-4, wherein, The inner tube (1) is a steel tube.

10. The corrosion resistant insulated polyurethane pipe according to any one of claims 1-4, characterized in that, The heat preservation layer (3) is made of foamed polyurethane.

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