Temperature-resistant, heat-insulating and flexible double-layer pipeline with condensation-resistant surface

Abstract

The temperature-resistant, heat-preservation and flexible double-layer pipeline comprises an inner-layer conveying pipe and an outer-layer protection pipe, the inner-layer conveying pipe is located in the outer-layer protection pipe, a heat insulation layer is formed between the inner-layer conveying pipe and the outer-layer protection pipe, a plurality of supporting strips are arranged in the heat insulation layer, the inner sides of the supporting strips are fixedly connected with the inner-layer conveying pipe, and the inner-layer conveying pipe is fixedly connected with the outer-layer protection pipe. The outer side of the supporting strip is fixedly connected with an outer-layer protection pipe. According to the temperature-resistant, heat-preservation and flexible double-layer pipeline with the condensation-resistant surface, the heat insulation layer and the specific vacuum degree design, heat transfer of the inner layer and the outer layer is effectively blocked, the condensation phenomenon on the surface of the pipeline is greatly reduced, corrosion is avoided, and the maintenance cost is reduced; the supporting strips with optimized shapes of the inner and outer connecting parts enhance the connecting strength and structural stability of the inner and outer layer pipelines, and ensure the heat insulation performance.

Description

Technical Field

[0001] The invention belongs to the technical field of pipelines, and in particular relates to a heat-resistant, heat-insulating, flexible double-layer pipeline with a surface condensation resistance. Background Art

[0002] Pipeline transportation systems are widely used in modern industrial and civilian applications, from petrochemicals and natural gas transportation to building water supply and drainage. This is particularly true in the rubber and plastic molding industry, where constant temperature control is required and both low-temperature and high-temperature media (characterized by large temperature differences between inside and outside) require pipeline transportation. Traditional pipelines present numerous problems during use. In environments with large temperature fluctuations, condensation is highly susceptible to forming on pipe surfaces. When the temperature of the medium being transported within the pipe differs significantly from the ambient temperature, condensation forms on the pipe surface due to the temperature difference. This not only causes moisture on the pipe surface, impacting sanitation, but can also cause corrosion, shortening pipe lifespan, increasing maintenance costs, and posing safety risks. For example, single-layer TPU pipes (1.5-2.0mm thick) commonly used in the industry have a thermal conductivity greater than 0.25W / (m·K). When cooling water at 5-10°C passes through the pipe, the outer surface temperature differs by 15-20°C from the ambient temperature. At humidity levels greater than 85%, significant condensation forms within 10 minutes. This causes water to accumulate on the production floor, and the temperature difference between the inside and outside of the pipe increases energy loss outside the pipe. This wastes energy, and the lost heat causes the workshop temperature to rise. Analysis of the reasons why single-layer TPU pipes are prone to condensation includes: 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 thermal insulation.

[0003] Therefore, developing a pipeline that can effectively prevent surface condensation, has good temperature resistance and flexibility, and has a stable structure and excellent comprehensive performance has become an urgent problem to be solved in the industry. Summary of the Invention

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a heat-resistant, heat-insulating, flexible double-layer pipe with a surface resistant to condensation, including an inner conveying pipe and an outer protective pipe. The inner conveying pipe is located inside the outer protective pipe, and an insulation layer is formed between the inner conveying pipe and the outer protective pipe. A number of support bars are provided in the insulation layer, and the inner side of the support bar is fixedly connected to the inner conveying pipe, and the outer side of the support bar is fixedly connected to the outer protective pipe.

[0005] 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, which is fixedly connected to the inner layer conveying pipe, and 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.

[0006] As a preferred embodiment of the above technical solution, the vacuum degree of the thermal insulation layer is ≤10Pa.

[0007] As a preferred embodiment of the above technical solution, the support bars are continuously or discontinuously arranged along the length direction of the inner layer conveying pipe.

[0008] As a preferred embodiment of the above technical solution, the support bars are distributed in an array around the circumference of the inner conveying pipe.

[0009] As a preferred embodiment of the above technical solution, the support bar, the inner delivery pipe and the outer protective pipe are all flexible.

[0010] As a preferred embodiment of the above technical solution, the support bar, the inner delivery pipe and the outer protective pipe are integrally formed.

[0011] As a preferred embodiment of the above technical solution, the support bar, the inner delivery tube and the outer protective tube are integrally formed of modified TPU material.

[0012] As a preferred embodiment of the above technical solution, the modified TPU material includes: 65-85 parts of TPU base material, 8-12 parts of aerogel powder, 5-8 parts of nano-ceramic powder, 1.5-2 parts of antioxidant, and 3-5 parts of flame retardant.

[0013] As a preferred embodiment of the above technical solution, the aerogel powder includes silicon dioxide, the nano-ceramic powder includes any one or more of boron nitride nanopowder and hexagonal boron nitride, the antioxidant includes any one or more of hindered phenol and phosphite, and the flame retardant includes any one or more of aluminum hypophosphite, resorcinol bisphosphate, and zinc borate.

[0014] The beneficial effects of the present invention are as follows: The heat-resistant, heat-insulating, and flexible double-layer pipe with a condensation-resistant surface, the insulation layer and the specific vacuum design effectively block heat transfer between the inner and outer layers, significantly reducing condensation on the pipe surface, avoiding corrosion, and lowering maintenance costs; the support bars with optimized shapes at the inner and outer connecting parts enhance the connection strength and structural stability of the inner and outer pipes, ensuring thermal insulation performance; the support bars are designed to be distributed in a continuous or intermittent, circular array to adapt to different working conditions. In addition, the flexibility and one-piece molding characteristics of the support bars and the inner and outer pipes ensure the structural strength and sealing of the pipes; the modified TPU material gives the pipes excellent heat resistance, flame retardancy, and antioxidant properties, meeting the requirements of complex scenarios and improving the safety and durability of the pipe system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 This is a picture of the product's anti-condensation effect. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0020] Example 1 This heat-resistant, insulated, and flexible double-layer pipe with a condensation-resistant surface comprises an inner delivery pipe 1 and an outer protective pipe 2. The inner delivery pipe 1 is positioned within the outer protective pipe 2, forming an insulation layer 3 between the two. Three support bars 4 are positioned within the insulation layer 3. The inner sides of the support bars 4 are fixedly connected to the inner delivery pipe 1, while the outer sides of the support bars 4 are fixedly connected to the outer protective pipe 2. The inner sides of the support bars 4 have inner connecting portions 5 of gradually decreasing thickness, which are fixedly connected to the inner delivery pipe 1. The outer sides of the support bars 4 have outer connecting portions 6 of gradually increasing thickness, which are fixedly connected to the outer protective pipe 2. The insulation layer 3 has a vacuum level of ≤10 Pa. The insulation layer 3 is evacuated using a vacuum pump. After evacuation, the ends of the insulation layer 3 are sealed using a process such as high-frequency welding. The support bars 4 are continuously arranged along the length of the inner delivery pipe 1 and are arranged in a circular array around the circumference of the inner delivery pipe 1. The support bar 4, inner delivery tube 1, and outer protective tube 2 are all flexible. They are integrally formed from modified TPU material. The inner delivery tube 1 is 1.2 mm thick, the outer protective tube 2 is 1.5 mm thick, and the insulation layer 3 is 2.5 mm thick, with a surface roughness Ra of less than 3.2 μm.

[0021] The modified TPU material includes: 80 parts of TPU base material, 10 parts of silica powder (aerogel powder), 5 parts of boron nitride nanosheets, 2 parts of hindered phenol + phosphite (antioxidant), and 3 parts of aluminum hypophosphite + zinc borate (flame retardant).

[0022] Comparative Example 1 The single-layer TPU tube 8 of TU1065 model produced by the commercial Japanese SMC company is 10 mm in outer diameter and 1.75 mm in thickness.

[0023] The performance test of the heat-resistant, heat-insulating, flexible double-layer pipe with anti-condensation surface in Example 1 was carried out: After testing, the heat-resistant, heat-insulating, flexible double-layer pipe with anti-condensation surface in Example 1 had an overall thermal conductivity of ≤0.15W / (m·K), an operating temperature range of -40-120°C, and a vacuum layer thermal resistance of >0.35(m 2 ·K) / W.

[0024] The anti-condensation performance of the heat-resistant, heat-insulating, flexible double-layer pipe with an anti-condensation surface and the anti-condensation performance of the single-layer TPU pipe 8 in Comparative Example 1 were tested. The test results are shown in the following table: The actual anti-condensation effect of the heat-resistant, heat-insulating, flexible double-layer pipe with anti-condensation surface in Example 1 and the single-layer TPU pipe 8 in Comparative Example 1 is as follows: Figure 2 shown.

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

[0026] It is worth mentioning that the technical features such as one-piece molding and high-frequency welding involved in the patent application of this invention should be regarded as prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional means in the field and should not be regarded as the inventive point of this patent. This patent will not be further elaborated.

[0027] The above describes in detail the preferred specific embodiments of the present invention. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solutions that can be obtained by technicians in this technical field through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of existing technologies should be within the scope of protection determined by the claims.

Claims

1. The surface is condensation-resistant, heat-insulating, flexible double-layer pipe, characterized by: It includes an inner conveying pipe and an outer protective pipe. The inner conveying pipe is located inside the outer protective pipe. An insulation layer is formed between the inner conveying pipe and the outer protective pipe. Several support bars are provided in the insulation layer. The inner side of the support bar is fixedly connected to the inner conveying pipe, and the outer side of the support bar is fixedly connected to the outer protective pipe.

2. The heat-resistant, heat-insulating, flexible double-layer pipe with condensation-resistant surface as claimed 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 heat-resistant, heat-insulating, flexible double-layer pipe with condensation-resistant surface as claimed in claim 1, characterized in that: The vacuum degree of the thermal insulation layer is ≤10Pa.

4. The heat-resistant, heat-insulating, flexible double-layer pipe with condensation-resistant surface as claimed in claim 1, characterized in that: The support bars are arranged continuously or discontinuously along the length direction of the inner layer conveying pipe.

5. The heat-resistant, heat-insulating, flexible double-layer pipe with condensation-resistant surface as claimed in claim 1, characterized in that: The support bars are distributed in an array around the circumference of the inner layer conveying pipe.

6. The heat-resistant, heat-insulating, flexible double-layer pipe with condensation-resistant surface as claimed in claim 1, characterized in that: The support bar, the inner layer delivery pipe and the outer layer protection pipe are all flexible.

7. The heat-resistant, heat-insulating, flexible double-layer pipe with condensation-resistant surface as claimed in claim 1, characterized in that: The support bar, the inner layer delivery pipe and the outer layer protection pipe are integrally formed.

8. The heat-resistant, heat-insulating, flexible double-layer pipe with condensation-resistant surface as claimed in claim 7, characterized in that: The support bar, the inner layer delivery pipe and the outer layer protection pipe are integrally formed from modified TPU material.

9. The heat-resistant, heat-insulating, flexible double-layer pipe with condensation-resistant surface as claimed in claim 8, characterized in that: The modified TPU material comprises: 65-85 parts of TPU base material, 8-12 parts of aerogel powder, 5-8 parts of nano-ceramic powder, 1.5-2 parts of antioxidant, and 3-5 parts of flame retardant.

10. The heat-resistant, heat-insulating, flexible double-layer pipe with condensation-resistant surface according to claim 9, characterized in that: The aerogel powder includes silicon dioxide, the nano-ceramic powder includes any one or more of boron nitride nano-powder and hexagonal boron nitride, the antioxidant includes any one or more of hindered phenol and phosphite, and the flame retardant includes any one or more of aluminum hypophosphite, resorcinol bisphosphate and zinc borate.

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