A type of heat-insulating plastic pipe

Abstract

This utility model proposes an insulated plastic pipe, belonging to the technical field of insulated plastic pipes. To address the problems of polyurethane materials being prone to aging and moisture absorption, or the increased heat transfer through interwoven fiber layers leading to reduced insulation, this utility model incorporates a first insulation component. Instead of directly filling with fibers, it uses spherical fiber blocks, resulting in fewer contact points between the spherical insulation blocks, effectively reducing thermal bridging and further decreasing heat transfer while increasing compressive strength. A second insulation component is also included, using inert gas for insulation. Compared to traditional polyurethane insulation layers, this effectively avoids the problems of aging or moisture affecting the insulation performance.

Description

Technical Field

[0001] This utility model relates to the field of thermal insulation plastic pipe technology, and in particular to a thermal insulation plastic pipe. Background Technology

[0002] When plastic pipes are used to transport high-temperature fluids such as hot water and steam, heat will continuously dissipate into the surrounding environment through the pipe walls without insulation, resulting in significant heat loss. This not only wastes energy and increases the operating costs of heating systems, but also reduces energy efficiency. By insulating plastic pipes, the rate of heat loss can be effectively reduced, allowing more heat to be retained within the pipes, thus improving energy utilization and achieving energy conservation.

[0003] Chinese patent CN213982328U discloses a flexible, heat-insulating, and energy-saving plastic pipe, comprising a pipe body, an innermost flexible hose, an aluminum foil layer on the outside of the flexible hose, a polyurethane insulation layer on the outside of the aluminum foil layer, and a conduit extending in the same direction as the pipe body axis within the polyurethane insulation layer, with a first heat-conducting wire inside the conduit. In this invention, one end of the pipe body has an external thread, and the other end has a threaded retainer. During assembly, the threaded ends of two pipe bodies are inserted into the threaded retainer of the other pipe body, and then rotated to fix the two pipes together. This allows for quick assembly and connection of the plastic pipes. Furthermore, the flexible hose, aluminum foil layer, polyurethane insulation layer, conduit, and outer pipe ensure good insulation in winter, sufficient to withstand cold air. The structure is simple, practical, and safe.

[0004] Existing insulated plastic pipes typically use a polyurethane insulation layer to insulate the fluid inside. However, polyurethane insulation layers are prone to aging, cracking, and moisture absorption. External moisture can penetrate the gaps inside the polyurethane material, and the high thermal conductivity of moisture can replace the poor thermal conductivity of the gas, significantly affecting its insulation performance. Furthermore, when using polyurethane materials or directly using fiber layers for insulation, the interwoven layers within the polyurethane material or between the fibers create numerous contact points, making it easier for heat to be conducted through these points, thus reducing the insulation effect. Utility Model Content

[0005] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies that typically use polyurethane insulation layers to insulate fluids inside pipes. These technologies often suffer from the drawbacks of polyurethane insulation layers, which are prone to aging, cracking, and moisture absorption. External moisture can penetrate the gaps within the polyurethane material, and the high thermal conductivity of the moisture, replacing the poorly conductive gas, significantly impacts its insulation performance. Furthermore, the use of polyurethane materials or fiber layers for insulation results in numerous contact points within the polyurethane material or between the fibers, making heat transfer easier and reducing the insulation effect. This invention proposes a heat-insulating plastic pipe.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a heat-insulating plastic pipe, comprising: a plastic pipe body, a reflective layer wrapped around the outside of the plastic pipe body, and the reflective layer being fixedly connected to the plastic pipe body, the reflective layer being used to reflect the heat inside the plastic pipe body, a first heat-insulating component coaxially nested outside the reflective layer, the first heat-insulating component comprising a first inner layer and a first outer layer, and the first inner layer being fixedly connected to the reflective layer, a second heat-insulating component coaxially nested outside the first outer layer, the second heat-insulating component comprising a second inner layer, and the second inner layer and the first outer layer being integrally formed.

[0007] Preferably, the first outer layer is coaxially sleeved outside the first inner layer, and the first outer layer and the first inner layer together form the first heat insulation cavity.

[0008] Preferably, the interior of the first heat-insulating cavity is uniformly filled with heat-insulating blocks, and the shape of the heat-insulating blocks is set to spherical.

[0009] Preferably, the outer wall of the first inner layer is uniformly arranged with second limiting fins, and the second limiting fins are fixedly connected to the first inner layer; the inner wall of the first outer layer is uniformly arranged with first limiting fins, and the first limiting fins are fixedly connected to the first outer layer; the first limiting fins and the second limiting fins are spaced apart.

[0010] Preferably, a second outer layer is coaxially sleeved on the outside of the second inner layer, and the second outer layer and the second inner layer together form a second heat insulation cavity, the interior of which is filled with inert gas.

[0011] Preferably, the interior of the second heat insulation cavity is provided with a buffer reinforcement layer, the inner wall of the buffer reinforcement layer is fixedly connected to the second inner layer, and the outer wall of the buffer reinforcement layer is fixedly connected to the second outer layer.

[0012] Preferably, the cross-sectional shape of the buffer reinforcement layer is set to be wavy.

[0013] Compared with the prior art, the beneficial effects of this utility model include:

[0014] 1. This utility model, by incorporating a first insulation component, abandons the method of directly filling with fibers and instead uses spherical fiber blocks for filling. The number of contact points between each spherical insulation block is relatively small, which can effectively reduce the thermal bridge effect formed by heat transfer through the contact points, thereby further reducing heat transfer. In addition, the spherical structure has good compressive strength. When subjected to external pressure, it can evenly transfer the pressure in all directions, enabling the entire filling structure to withstand greater pressure without deformation and enhancing the strength of the pipe wall.

[0015] 2. This utility model incorporates a second insulation component, which uses inert gas for thermal insulation. Compared to the traditional method of using a polyurethane insulation layer, this effectively avoids the problems of insulation layer aging or moisture affecting the insulation effect. Attached Figure Description

[0016] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0017] Figure 1 The schematic diagram shows a cross-sectional view of an integral thermal insulation plastic pipe according to one embodiment of the present invention.

[0018] Figure 2 The schematic diagram shows a three-dimensional structural diagram of an integral heat-insulating plastic pipe according to one embodiment of the present invention.

[0019] Figure 3 The schematic diagram shows a cross-sectional view of a first insulation component portion of an insulated plastic pipe according to one embodiment of the present invention.

[0020] Figure 4 The diagram schematically shows a cross-sectional view of a second insulation component portion of an insulated plastic pipe according to one embodiment of the present invention.

[0021] The following are the labeling elements in the diagram: 1. Main body of plastic pipe; 2. Reflective layer; 3. First insulation component; 4. Second insulation component; 301. First inner layer; 302. First outer layer; 303. First insulation cavity; 304. Insulation block; 305. First limiting fin; 306. Second limiting fin; 401. Second inner layer; 402. Second outer layer; 403. Second insulation cavity; 404. Buffer reinforcement layer. Detailed Implementation

[0022] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0023] According to one embodiment of the present invention, in conjunction with Figures 1 to 4 As shown. A heat-insulating plastic pipe includes: a plastic pipe body 1, a reflective layer 2 wrapped around the outside of the plastic pipe body 1 and fixedly connected to the plastic pipe body 1, the reflective layer 2 being used to reflect heat inside the plastic pipe body 1, a first heat-insulating component 3 coaxially nested outside the reflective layer 2, the first heat-insulating component 3 including a first inner layer 301 and a first outer layer 302, the first inner layer 301 being fixedly connected to the reflective layer 2, a second heat-insulating component 4 coaxially nested outside the first outer layer 302, the second heat-insulating component 4 including a second inner layer 401, and the second inner layer 401 and the first outer layer 302 being integrally formed.

[0024] The reflective layer 2 can be made of aluminum foil. Aluminum foil has a high metallic luster and strong reflectivity for visible light and heat radiation. It can reflect most of the heat radiation light transmitted from inside the plastic pipe body 1 back to it, making it difficult for heat to penetrate the aluminum foil to reach the other side. This can block the heat from being transferred outward from inside the plastic pipe body 1.

[0025] The first outer layer 302 is coaxially sleeved on the outside of the first inner layer 301. The first outer layer 302 and the first inner layer 301 together form the first heat insulation cavity 303. The interior of the first heat insulation cavity 303 is uniformly filled with heat insulation blocks 304, and the shape of the heat insulation blocks 304 is set as spherical.

[0026] The insulation block 304 is made of rock wool fiber, which is a long, thin fiber that interweaves to form a porous structure. A large amount of air is trapped in the pores. The low thermal conductivity of air, combined with the barrier effect of the fiber, results in low thermal conductivity of the insulation block 304. Furthermore, this invention abandons the method of directly filling with fiber, but instead uses spherical fiber blocks for filling. There are relatively few contact points between the spherical insulation blocks 304, which can effectively reduce the thermal bridging effect formed by heat transfer through the contact points, thereby further reducing heat transfer. In addition, the spherical structure has good compressive strength. When subjected to external pressure, it can evenly transfer the pressure in all directions, allowing the entire filling structure to withstand greater pressure without deformation, thus enhancing the strength of the pipe wall.

[0027] The outer wall of the first inner layer 301 is uniformly arranged with second limiting fins 306, and the second limiting fins 306 are fixedly connected to the first inner layer 301. The inner wall of the first outer layer 302 is uniformly arranged with first limiting fins 305, and the first limiting fins 305 are fixedly connected to the first outer layer 302. The first limiting fins 305 and the second limiting fins 306 are spaced apart.

[0028] The first limiting fin 305 and the second limiting fin 306 are used to separate and limit the heat insulation block 304 filled inside the first heat insulation cavity 303, so that it is evenly distributed inside the first heat insulation cavity 303 and prevents it from piling up. The second limiting fin 306 does not contact the first outer layer 302, and the first limiting fin 305 does not contact the first inner layer 301, so as to prevent heat from being directly transferred through the first limiting fin 305 and the second limiting fin 306.

[0029] The second inner layer 401 is coaxially sleeved with a second outer layer 402. The second outer layer 402 and the second inner layer 401 together form a second heat insulation cavity 403, and the interior of the second heat insulation cavity 403 is filled with inert gas.

[0030] Inert gases such as helium, neon, and argon can be used. They have stable atomic structures, relatively inactive molecular motion, and low collision frequency between molecules. In addition, these gases have relatively large molecular masses and short molecular free paths. These characteristics result in low thermal conductivity of inert gases, which can effectively prevent heat from being transferred out of the tube.

[0031] The second heat insulation cavity 403 is provided with a buffer reinforcement layer 404. The inner wall of the buffer reinforcement layer 404 is fixedly connected to the second inner layer 401, and the outer wall of the buffer reinforcement layer 404 is fixedly connected to the second outer layer 402. The cross-sectional shape of the buffer reinforcement layer 404 is set to be wavy.

[0032] The undulating shape of the wave-shaped buffer reinforcement layer 404 gives it good mechanical balance in all directions. When subjected to external forces, the wave-shaped structure can adapt to the direction of the force by changing its shape, dispersing and transmitting the force along the curve of the wave, avoiding the force from concentrating at a certain point or in a certain area, thereby making the entire structure more stable and enhancing the strength of the pipe wall. In addition, the contact area between the wave-shaped buffer reinforcement layer 404 and the second inner layer 401 and the second outer layer 402 is small, which can minimize the direct transfer of heat through the reinforcement components.

[0033] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A thermal insulation plastic pipe having, characterized by, include: A plastic pipe body is provided, the outside of which is wrapped with a reflective layer and fixedly connected to the plastic pipe body. The reflective layer is used to reflect heat inside the plastic pipe body. A first heat insulation component is coaxially nested outside the reflective layer. The first heat insulation component includes a first inner layer and a first outer layer, and the first inner layer is fixedly connected to the reflective layer. A second heat insulation component is coaxially nested outside the first outer layer. The second heat insulation component includes a second inner layer, and the second inner layer and the first outer layer are integrally formed.

2. The insulated plastic pipe according to claim 1, characterized in that, The first outer layer is coaxially sleeved on the outside of the first inner layer, and the first outer layer and the first inner layer together form a first heat insulation cavity.

3. The insulated plastic pipe according to claim 2, characterized in that, The interior of the first heat-insulating cavity is uniformly filled with heat-insulating blocks, and the heat-insulating blocks are spherical in shape.

4. The insulated plastic pipe according to claim 2, characterized in that, The outer wall of the first inner layer is uniformly arranged with second limiting fins, and the second limiting fins are fixedly connected to the first inner layer. The inner wall of the first outer layer is uniformly arranged with first limiting fins, and the first limiting fins are fixedly connected to the first outer layer. The first limiting fins and the second limiting fins are spaced apart.

5. The insulated plastic pipe according to claim 1, characterized in that, The second inner layer is coaxially sleeved with a second outer layer. The second outer layer and the second inner layer together form a second heat-insulating cavity, and the interior of the second heat-insulating cavity is filled with inert gas.

6. The insulated plastic pipe according to claim 5, characterized in that, The interior of the second heat insulation cavity is provided with a buffer reinforcement layer, the inner wall of which is fixedly connected to the second inner layer, and the outer wall of which is fixedly connected to the second outer layer.

7. The insulated plastic pipe according to claim 6, characterized in that, The cross-sectional shape of the buffer reinforcement layer is set to be wavy.

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