Surface anti-condensation temperature-resistant, heat-retaining, flexible double-layer pipeline

Abstract

This utility model discloses a surface-resistant, heat-insulating, and flexible double-layer pipe with anti-condensation properties. It includes an inner delivery pipe and an outer protective pipe. The inner delivery pipe is located inside the outer protective pipe, and a heat insulation layer is formed between them. Several support strips are provided within the heat insulation layer. The inner delivery pipe is fixedly connected to the inner side of each support strip, and the outer protective pipe is fixedly connected to the outer side of each support strip. This utility model's surface-resistant, heat-insulating, and flexible double-layer pipe, with its heat insulation layer and specific vacuum design, effectively blocks heat transfer between the inner and outer layers, significantly reducing condensation on the pipe surface, preventing corrosion, and lowering maintenance costs. The optimized shape of the support strips at the inner and outer connections enhances the connection strength and structural stability of the inner and outer pipes, ensuring heat insulation performance.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline technology, specifically relating to a temperature-resistant, heat-insulating, and flexible double-layer pipeline with an anti-condensation surface. Background Technology

[0002] In modern industrial and civil sectors, pipeline transportation systems are widely used, from petrochemicals and natural gas transportation to building water supply and drainage. Especially in the rubber and plastics molding industry, processes requiring constant temperature control necessitate the use of pipelines to transport both low-temperature and high-temperature media (characterized by significant internal and external temperature differences). Traditional pipelines present numerous problems during their use.

[0003] In environments with significant temperature variations, condensation easily occurs on pipe surfaces. When the temperature of the medium transported inside the pipe differs greatly from the ambient temperature, condensation forms on the pipe surface due to this temperature difference. This not only leads to dampness on the pipe surface, affecting environmental hygiene, but can also cause pipe corrosion, shorten the pipe's lifespan, increase maintenance costs, and create safety hazards. For example, commonly used single-layer TPU pipes (1.5-2.0mm thick) have a thermal conductivity >0.25W / (m·K). When 5-10℃ cooling water passes through, the temperature difference between the pipe's outer surface and the ambient temperature reaches 15-20℃, and with humidity >85%, significant condensation appears within 10 minutes. This results in water accumulation on the production floor, and the increased temperature difference between the inside and outside of the pipe also leads to greater energy loss. This causes energy waste, and the dissipated heat causes the workshop temperature to rise. The reasons for the condensation easily occurring in single-layer TPU pipes are: the single-layer structure cannot block the heat conduction path; the TPU material itself has a relatively high thermal conductivity (0.23-0.28W / (m·K)); and the lack of active insulation design.

[0004] Therefore, developing a pipe that can effectively prevent surface condensation, has good temperature resistance and flexibility, and is structurally stable and has excellent overall performance has become an urgent problem to be solved in the industry. Utility Model Content

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a double-layer pipe with anti-condensation surface, heat resistance, heat insulation, and flexibility, including an inner conveying pipe and an outer protective pipe. The inner conveying pipe is located inside the outer protective pipe, and a heat insulation layer is formed between the inner conveying pipe and the outer protective pipe. Several support strips are provided in the heat insulation layer. The inner side of the support strip is fixedly connected to the inner conveying pipe, and the outer side of the support strip is fixedly connected to the outer protective pipe.

[0006] As a preferred embodiment of the above technical solution, the inner side of the support bar is provided with an inner connecting part with a gradually decreasing thickness, and the inner connecting part is fixedly connected to the inner conveying pipe. The outer side of the support bar is provided with an outer connecting part with a gradually increasing thickness, and the outer connecting part is fixedly connected to the outer protective pipe.

[0007] As a preferred embodiment of the above technical solution, the vacuum degree of the insulation layer is ≤10Pa.

[0008] As a preferred embodiment of the above technical solution, the support strip is continuously or intermittently arranged along the length of the inner conveying pipe.

[0009] As a preferred embodiment of the above technical solution, the support strips are arranged in a circumferential array around the inner conveying pipe.

[0010] As a preferred embodiment of the above technical solution, the support strip, the inner conveying pipe, and the outer protective pipe are all flexible.

[0011] As a preferred embodiment of the above technical solution, the support strip, the inner conveying pipe, and the outer protective pipe are integrally formed.

[0012] The beneficial effects of this utility model are as follows: This utility model features a surface-resistant, heat-insulating, and flexible double-layer pipe with anti-condensation properties. The insulation layer and specific vacuum design effectively block heat transfer between the inner and outer layers, significantly reducing condensation on the pipe surface, preventing corrosion, and lowering maintenance costs. The optimized shape of the support strips at the inner and outer connections enhances the connection strength and structural stability of the inner and outer pipe layers, ensuring heat insulation performance. The continuous or intermittent, circumferentially arrayed support strip design adapts to different working conditions. Furthermore, the flexibility and integrated molding characteristics of the support strips and inner and outer pipe layers ensure the structural strength and sealing of the pipe. The modified TPU material endows the pipe with excellent temperature resistance, flame retardancy, and oxidation resistance, meeting the requirements of complex application scenarios and improving the safety and durability of the pipeline system. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0015] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] Example 1

[0018] A heat-resistant, heat-insulating, and flexible double-layered pipe with anti-condensation surface includes an inner delivery pipe 1 and an outer protective pipe 2. The inner delivery pipe 1 is located inside the outer protective pipe 2, forming a heat insulation layer 3 between them. Three support strips 4 are provided within the heat insulation layer 3. The inner delivery pipe 1 is fixedly connected to the inner side of each support strip 4, and the outer protective pipe 2 is fixedly connected to the outer side of each support strip 4. The inner side of each support strip 4 has an inner connecting part 5 with gradually decreasing thickness, which is fixedly connected to the inner delivery pipe 1. The outer side of each support strip 4 has an outer connecting part 6 with gradually increasing thickness, which is fixedly connected to the outer protective pipe 2. The vacuum degree of the heat insulation layer 3 is ≤10Pa. The heat insulation layer 3 is evacuated using a vacuum pump. After evacuation, both ends of the heat insulation layer 3 are sealed using processes such as high-frequency welding. The support strips 4 are continuously arranged along the length of the inner delivery pipe 1. The support strips 4 are distributed in a circumferential array around the inner delivery pipe 1. The support strip 4, inner delivery pipe 1, and outer protective pipe 2 are all flexible. The support strip 4, inner delivery pipe 1, and outer protective pipe 2 are integrally molded from modified TPU material. The inner delivery pipe 1 has a thickness of 1.2 mm, the outer protective pipe 2 has a thickness of 1.5 mm, the insulation layer 3 has a thickness of 2.5 mm, and the surface roughness Ra < 3.2 μm.

[0019] The modified TPU material comprises, by weight percentage: 80 parts TPU base material, 10 parts silica powder (aerogel powder), 5 parts boron nitride nanosheets, 2 parts hindered phenol + phosphite (antioxidant), and 3 parts aluminum hypophosphite + zinc borate (flame retardant).

[0020] Comparative Example 1

[0021] Purchased commercially available TU1065 single-layer TPU tubing (model 8) manufactured by SMC Corporation of Japan. This single-layer TPU tubing (model 8) has an outer diameter of 10mm and a thickness of 1.75mm.

[0022] Performance tests were conducted on the surface-resistant, heat-insulating, and flexible double-layer pipe with condensation-resistant surface prepared in Example 1. The tests showed that the overall thermal conductivity of the surface-resistant, heat-insulating, and flexible double-layer pipe prepared in Example 1 is ≤0.15 W / (m·K), the operating temperature range is -40-120℃, and the thermal resistance of the vacuum layer is >0.35 (m). 2 ·K) / W.

[0023] The condensation resistance of the surface-resistant, heat-insulating, and flexible double-layer pipe was tested, along with the condensation resistance of the single-layer TPU pipe 8 in Comparative Example 1. The test results are shown in the table below:

[0024]

[0025] Therefore, the technical solution of this application applies vacuum insulation technology to flexible cooling pipes, and through the dual means of "physical isolation + material modification", the surface temperature difference is controlled within 3℃ (15℃ in the traditional solution), thus fundamentally eliminating condensation conditions.

[0026] It is worth mentioning that the technical features such as integral molding and high-frequency welding involved in this utility model patent application should be regarded as prior art. The specific structure, working principle and possible control methods and spatial arrangement of these technical features can be adopted by conventional choices in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated in detail.

[0027] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experimentation on the basis of the prior art should be within the scope of protection defined by the claims.

Claims

1. A double-layer pipe with anti-condensation surface, characterized by its temperature resistance, heat insulation, and flexibility. It includes an inner conveying pipe and an outer protective pipe. The inner conveying pipe is located inside the outer protective pipe, and a heat insulation layer is formed between the inner conveying pipe and the outer protective pipe. Several support strips are provided in the heat insulation layer. The inner conveying pipe is fixedly connected to the inner side of the support strips, and the outer protective pipe is fixedly connected to the outer side of the support strips.

2. The surface-resistant, heat-insulating, and flexible double-layer pipe with anti-condensation properties as described in claim 1, characterized in that, The inner side of the support bar is provided with an inner connecting part with a gradually decreasing thickness, which is fixedly connected to the inner layer conveying pipe. The outer side of the support bar is provided with an outer connecting part with a gradually increasing thickness, which is fixedly connected to the outer layer protective pipe.

3. The surface-resistant, heat-insulating, and flexible double-layer pipe with anti-condensation properties as described in claim 1, characterized in that, The vacuum degree of the insulation layer is ≤10Pa.

4. The surface-resistant, heat-insulating, and flexible double-layer pipe with anti-condensation properties as described in claim 1, characterized in that, The support bars are either continuously or intermittently arranged along the length of the inner conveying pipe.

5. The surface-resistant, heat-insulating, and flexible double-layer pipe with anti-condensation properties as described in claim 1, characterized in that, The support bars are arranged in a circumferential array around the inner delivery pipe.

6. The surface-resistant, heat-insulating, and flexible double-layer pipe with anti-condensation properties as described in claim 1, characterized in that, The support strip, inner conveying pipe, and outer protective pipe are all flexible.

7. The surface-resistant, heat-insulating, flexible double-layer pipe with anti-condensation properties as described in claim 1, characterized in that, The support strip, inner conveying pipe, and outer protective pipe are integrally formed.

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