Anti-frost heaving MPP pipe

Abstract

The utility model relates to anti -frost heaving MPP pipe field, especially anti -frost heaving MPP pipe, including pipe body and heat absorption layer, pipe body inner wall is fixedly connected with heat absorption layer, the outer wall of pipe body is processed with a plurality of first cavity, the cavity inside is equipped with pipe material anti -frost heaving structure, pipe material anti -frost heaving structure includes anti -frost layer, the outer wall upper end of anti -frost layer is fixedly connected with honeycomb net, the inside processing of honeycomb net has second cavity, the first cavity inner wall upper end is fixedly connected with heat dissipation layer. The anti -frost heaving MPP pipe, through pipe material anti -frost heaving structure, the stress of ice expansion is dispersed to each honeycomb net's second cavity, and stress is absorbed by second cavity, avoids jar body deformation, and further promotes frost resistance, simultaneously, the capillary action of capillary duct between a plurality of second inner cavities can maintain the local liquid flow under low temperature, even if part unit second cavity ices, and the unit second cavity that has not frozen still can maintain heat exchange through capillary action (capillary duct).

Description

Technical Field

[0001] This utility model relates to the field of frost-resistant MPP pipe technology, specifically to an frost-resistant MPP pipe. Background Technology

[0002] MPP pipe, also known as MPP power cable protection pipe, is divided into open-cut and trenchless types. MPP trenchless pipe is also known as MPP jacking pipe or drag pipe. MPP pipe uses modified polypropylene as the main raw material and has the characteristics of high temperature resistance and external pressure resistance. It is suitable for medium and low voltage power transmission cable ducts below 10KV.

[0003] For example, a high-temperature resistant and freeze-proof MPP pipe with application publication number "CN111326999A" uses elastic separators that repeatedly deform between low-temperature and high-temperature phase shapes, causing the coolant to flow directionally and periodically between the heat absorption and heat dissipation chambers, thereby completing heat dissipation. This technical solution achieves efficient heat convection between the inside and outside of the pipe through a unique structural design, effectively reducing heat accumulation on the inner wall of the pipe, ensuring stable cable operation, and keeping the inside and outside of the pipe within a suitable temperature range. This effectively reduces extreme temperatures near the pipe and improves the pipe's high-temperature resistance, cold resistance, and freeze-proof effect. However, in the above method, the coolant is stored in a single large chamber. The coolant needs to have high thermal conductivity, low freezing point, and high-temperature resistance, which can lead to failure in extreme environments (such as freezing). At the same time, the volume of the coolant expands when it freezes, generating stress and putting enormous pressure on the walls of the large chamber, leading to chamber cracking or pipe deformation, resulting in low freeze-proof performance. Utility Model Content

[0004] The purpose of this invention is to solve the problems mentioned above, where the coolant is stored in a single large chamber, but the coolant needs to have high thermal conductivity, low freezing point, and high temperature resistance. In extreme environments, it will fail (such as freezing). At the same time, when the coolant freezes, its volume expands and generates stress, which puts great pressure on the walls of the large chamber, leading to chamber cracking or pipe deformation and low frost resistance. Therefore, this invention proposes a frost-resistant MPP pipe.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] Design a frost-resistant MPP pipe, including a pipe body and a heat-absorbing layer. The inner wall of the pipe body is fixedly connected to the heat-absorbing layer. The outer wall of the pipe body is processed with multiple first cavities. The frost-resistant structure of the pipe body is provided inside the cavity.

[0007] Preferably, the pipe anti-freeze structure includes an anti-freeze layer, a honeycomb mesh is fixedly connected to the upper end of the outer wall of the anti-freeze layer, a second cavity is processed inside the honeycomb mesh, and a heat dissipation layer is fixedly connected to the upper end of the inner wall of the first inner cavity.

[0008] This design utilizes multiple secondary cavities within the honeycomb mesh to absorb the stress from ice expansion, preventing the tank from deforming.

[0009] Preferably, the lower end of the outer wall of the antifreeze layer is fixedly connected to the heat-absorbing layer.

[0010] Preferably, a vacuum layer is provided between the honeycomb mesh and the heat dissipation layer.

[0011] This setting reduces the impact of low external temperatures on the interior.

[0012] Preferably, the second cavity is connected via a capillary tube.

[0013] This design ensures that even if some of the second chambers of the unit freeze, the unfrozen second chambers can still maintain heat exchange through capillary action.

[0014] The present invention proposes an anti-freeze-swell MPP pipe, which has the following advantages: through the anti-freeze-swell structure of the pipe, the stress of ice expansion is dispersed to the second cavity of each honeycomb mesh, and the stress is absorbed by the second cavity, avoiding the deformation of the tank and thus improving the freeze resistance. At the same time, the capillary action of the capillary channels between multiple second inner cavities can maintain local liquid flow at low temperature. Even if some unit second cavities are frozen, the unfrozen unit second cavities can still maintain heat exchange through capillary action (capillary channels). Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 for Figure 1 A front sectional view;

[0017] Figure 3 for Figure 1 A three-dimensional sectional view;

[0018] Figure 4 for Figure 2 Enlarged view of A in the middle;

[0019] Figure 5 for Figure 2 A partial sectional view of the central cellular network.

[0020] In the diagram: 1. Pipe anti-freeze structure, 101. Heat dissipation layer, 102. Honeycomb mesh, 103. Second cavity, 104. Anti-freeze layer, 2. Pipe body, 3. First cavity, 4. Capillary tube, 5. Heat absorption layer. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] See attached document Figure 1-5In this embodiment, an anti-freeze-swell MPP pipe includes a pipe body 2 and a heat-absorbing layer 5. The inner wall of the pipe body 2 is fixedly connected to the heat-absorbing layer 5. The heat-absorbing layer 5 is made of aluminum and has good thermal conductivity. The outer wall of the pipe body 2 is processed with multiple first cavities 3. The anti-freeze-swell structure 1 of the pipe is provided inside the cavity 3. The heat-absorbing layer 5 is fixedly connected to the lower end of the outer wall of the anti-freeze layer 104. A vacuum layer is provided between the honeycomb mesh 102 and the heat dissipation layer 101. The vacuum layer can reduce the impact of external low temperature on the interior. The second cavities 103 are connected through capillary tubes 4. The second cavities 103 inside the honeycomb mesh 102 contain a small amount of coolant. They are connected through capillary tubes 4 to form a distributed liquid flow. The coolant is dispersed in multiple second cavities 103. Even if some second cavities 103 are frozen due to low temperature, other units can still maintain liquid heat dissipation.

[0023] See attached document Figure 1-5 The pipe anti-freeze structure 1 includes an anti-freeze layer 104, which is made of glass fiber. This layer can improve the rigidity and anti-freeze-swelling ability of the pipe body 2, reduce low-temperature shrinkage and deformation, and is suitable for areas with large temperature differences. A honeycomb mesh 102 is fixedly connected to the upper end of the outer wall of the anti-freeze layer 104. A second cavity 103 is processed inside the honeycomb mesh 102. A heat dissipation layer 101 is fixedly connected to the upper end of the inner wall of the first inner cavity 3. The heat dissipation layer 101 is made of aluminum and has good thermal conductivity. The partitioned design of multiple honeycomb meshes 102 (multiple second cavities 103) prevents the coolant from freezing completely. Even if some unit second cavities 103 freeze, the unfrozen unit second cavities 103 can still maintain heat exchange through capillary action (capillary channels 4).

[0024] Working principle:

[0025] MPP pipe anti-freeze heave work:

[0026] First, the outer wall of the tube body 2 is processed with multiple first inner cavities 3. The first cavity 3 and the honeycomb mesh 102 are separated by a vacuum interlayer to reduce the impact of external low temperature on the interior. During use, the internal circuit of the tube body 2 will generate heat. The heat absorption layer 5 absorbs the heat from the circuit. The heat absorption layer 5 transfers the heat to the antifreeze layer 104, the honeycomb mesh 102, the first inner cavity 3, and the heat dissipation layer 101. The heat is then transferred to the outside through the heat dissipation layer 101. The coolant can absorb a large amount of heat to prevent the temperature inside the tube body from changing suddenly.

[0027] When the tube 2 is frozen by the cold refrigerant, the stress of ice expansion is dispersed into the second cavity 103 of each honeycomb grid 102, and the stress is absorbed by the second cavity 103. At the same time, the capillary action of the capillary channels 4 between multiple second inner cavities 103 can maintain local liquid flow at low temperature. Even if some unit second cavity 103 freezes, the unfrozen unit second cavity 103 can still maintain heat exchange through capillary action (capillary channels 4). Meanwhile, the antifreeze layer 104 is made of glass fiber, which can improve the rigidity and antifreeze expansion capacity of the tube 2, reduce low temperature shrinkage deformation, and is suitable for areas with large temperature differences. In low temperature environment, the refrigerant in some second cavity 103 may freeze, but other second inner cavities 103 remain liquid due to small temperature differences or capillary flow, avoiding overall freezing.

[0028] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A frost-resistant MPP pipe, comprising a pipe body (2) and a heat-absorbing layer (5), wherein the inner wall of the pipe body (2) is fixedly connected to the heat-absorbing layer (5), characterized in that: The outer wall of the tube body (2) is processed with multiple first cavities (3), and the cavity (3) is provided with a tube anti-freeze-swelling structure (1). The pipe anti-freeze structure (1) includes an anti-freeze layer (104), and a honeycomb mesh (102) is fixedly connected to the upper end of the outer wall of the anti-freeze layer (104). A second cavity (103) is processed inside the honeycomb mesh (102), and a heat dissipation layer (101) is fixedly connected to the upper end of the inner wall of the first cavity (3).

2. The frost-resistant MPP pipe according to claim 1, characterized in that: The lower end of the outer wall of the antifreeze layer (104) is fixedly connected to the heat-absorbing layer (5).

3. The frost-resistant MPP pipe according to claim 2, characterized in that: A vacuum layer is provided between the cellular network (102) and the heat dissipation layer (101).

4. The frost-resistant MPP pipe according to claim 3, characterized in that: The second cavity (103) is connected through a capillary tube (4).

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