Low-temperature-resistant MPP insulating tube

Abstract

The utility model discloses a low-temperature-resistant MPP insulating tube, which belongs to the field of MPP insulating tubes and comprises an MPP tube base layer, a middle layer arranged on the outer side of the MPP tube base layer, a protective layer arranged on the outer side of the middle layer, an inner layer arranged on the inner side of the MPP tube base layer, a plurality of circular support rings connected inside the inner layer in a sliding manner, the inner layer is made of polytetrafluoroethylene, and the outer side of the MPP tube base layer is made of polytetrafluoroethylene. The round supporting ring is made of polyethylene, the transverse rigidity of the pipeline is improved, the bearing capacity of the pipeline on external loads is improved, the pressure resistance of the pipeline is improved, the pipeline is effectively prevented from deforming in the long-term operation process, the original shape and size of the pipeline are kept, and the pipeline has excellent toughness and impact resistance. The cable sheath can protect a cable under external impact, effectively prevents gas and moisture from permeating, improves the sealing performance of a pipeline, has good chemical stability, and can resist erosion of many chemicals.

Description

Technical Field

[0001] The utility model relates to the field of MPP insulation pipes, and more specifically to a low-temperature resistant MPP insulation pipe. Background Art

[0002] MPP uses modified polypropylene as the main raw material. It is a construction project that does not require a large amount of dredging, digging, or damaging the road surface. It can lay pipelines and cables in special areas such as roads, railways, buildings, and riverbeds. Compared with the traditional "trench digging and pipe laying method", trenchless power pipe engineering is more in line with current environmental protection requirements, eliminating dust and traffic congestion caused by traditional construction. This technology can also lay pipelines in some areas where excavation operations cannot be carried out, such as historic sites protection areas, downtown areas, crop and farmland protection areas, highways, rivers, etc.

[0003] For example, the patent (CN216530336U) discloses an MPP power pipeline with strong electrical insulation. A placement rack is arranged inside the power pipeline, and an insulating wear-resistant layer and a heat-conducting layer are also arranged on the outside of the cable placement hole. The insulating wear-resistant layer can effectively prevent the cable from damaging the heat-conducting layer due to friction. The heat-conducting layer can conduct and dissipate the heat generated by the cable itself and the friction. There are gaps between the placement racks, so that the cables can dissipate heat better. The new model is also provided with a thermal insulation layer, which can maintain the temperature between the cable racks, avoiding damage to the cables and the insulation layer inside the placement racks due to seasonal temperature changes.

[0004] When using the above technology, it was found that the following technical problems exist in the prior art: deformation is easy to occur under the influence of factors such as gravity and internal pressure, resulting in changes in the size and shape of the pipeline, reducing the bearing capacity and service life of the pipeline. For this reason, we designed a low-temperature resistant MPP insulating pipe to provide another technical solution to the above technical problems. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a low-temperature resistant MPP insulating pipe, which increases the lateral rigidity of the pipeline, improves the pipeline's bearing capacity for external loads, improves the pipeline's compressive resistance, effectively prevents the pipeline from deforming during long-term operation, and maintains the original shape and size of the pipeline.

[0007] 2. Technical solution

[0008] To solve the above problems, the utility model adopts the following technical solutions.

[0009] A low-temperature resistant MPP insulating pipe comprises an MPP pipe base layer, an intermediate layer is arranged on the outer side of the MPP pipe base layer, a protective layer is arranged on the outer side of the intermediate layer, and an inner layer is arranged on the inner side of the MPP pipe base layer.

[0010] Furthermore, a plurality of circular support rings are slidably connected inside the inner layer, the material of the inner layer is polytetrafluoroethylene, and the material of the circular support rings is polyethylene.

[0011] Furthermore, a plurality of longitudinal limit blocks are arranged on the inner side of the inner layer, a plurality of longitudinal sliding grooves adapted to the longitudinal limit blocks are opened inside the circular support ring, and the circular support ring and the inner layer are slidingly connected through the longitudinal limit blocks and the longitudinal sliding grooves.

[0012] Furthermore, the middle layer is composed of an anti-corrosion layer, a thermal insulation layer, a low-temperature resistant layer, an anti-permeation layer, and a supporting layer. The anti-permeation layer is arranged on the outside of the supporting layer, the low-temperature resistant layer is arranged on the outside of the anti-permeation layer, the thermal insulation layer is arranged on the outside of the low-temperature resistant layer, and the anti-corrosion layer is arranged on the outside of the thermal insulation layer.

[0013] Furthermore, the material of the anti-corrosion layer is cross-linked polyethylene, the material of the thermal insulation layer is foamed polypropylene, the material of the low-temperature resistant layer is linear low-density polyethylene, the material of the anti-permeability layer is polyvinylidene chloride, and the material of the support layer is a polyester fiber reinforced layer.

[0014] Furthermore, a plurality of longitudinal support strips are longitudinally arranged inside the support layer, and the material of the longitudinal support strips is a carbon fiber reinforced layer.

[0015] Furthermore, the material of the protective layer is epoxy resin coating.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] This solution increases the lateral rigidity of the pipeline, improves the pipeline's carrying capacity for external loads, improves the pipeline's pressure resistance, effectively prevents the pipeline from deforming during long-term operation, maintains the original shape and size of the pipeline, has excellent toughness and impact resistance, can protect cables under external impact, effectively prevents the penetration of gas and moisture, improves the pipeline's sealing, has good chemical stability, and can resist corrosion from many chemicals. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the inner layer and the circular support ring of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the inner layer and the circular support ring of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the anti-corrosion layer and the thermal insulation layer of the utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the support layer and the longitudinal support strip of the utility model.

[0024] Description of the numbers in the figure:

[0025] 1. MPP pipe base layer; 2. Middle layer; 21. Anti-corrosion layer; 22. Thermal insulation layer; 23. Low temperature resistant layer; 24. Anti-penetration layer; 25. Support layer; 26. Longitudinal support strip; 3. Protective layer; 4. Inner layer; 41. Longitudinal limit block; 5. Circular support ring; 51. Longitudinal sliding groove. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0027] Example:

[0028] See also Figure 1-5 A low-temperature resistant MPP insulating pipe comprises an MPP pipe base layer 1, an intermediate layer 2 is arranged on the outer side of the MPP pipe base layer 1, a protective layer 3 is arranged on the outer side of the intermediate layer 2, and an inner layer 4 is arranged on the inner side of the MPP pipe base layer 1;

[0029] The inner layer 4 is slidably connected to a plurality of circular support rings 5. The material of the inner layer 4 is polytetrafluoroethylene, which has extremely high electrical insulation performance, can effectively protect the internal cables from external current interference, has extremely high heat resistance, can remain stable in high temperature environments, will not decompose or deform, and has a very smooth surface, which can reduce the friction of the cable in the pipe and facilitate the laying and replacement of the cable;

[0030] The circular support ring 5 is made of polyethylene, which has excellent electrical insulation properties and can effectively protect the internal cables from current interference. It also has excellent toughness and impact resistance and can protect the cables from external impacts.

[0031] A plurality of longitudinal limit blocks 41 are arranged on the inner side of the inner layer 4, and a plurality of longitudinal sliding grooves 51 adapted to the longitudinal limit blocks 41 are arranged inside the circular support ring 5. The circular support ring 5 and the inner layer 4 are slidably connected by the longitudinal limit blocks 41 and the longitudinal sliding grooves 51. The longitudinal limit blocks 41 and the longitudinal sliding grooves 51 are arranged so that the circular support ring 5 can slide longitudinally inside the inner layer 4. The arrangement of the circular support ring 5 can adjust the internal support strength of the MPP insulating tube, and the number of circular support rings 5 ​​inside the inner layer 4 can be adjusted according to the support requirements.

[0032] The middle layer 2 is composed of an anti-corrosion layer 21, a thermal insulation layer 22, a low-temperature resistant layer 23, an anti-permeation layer 24, and a support layer 25. The support layer 25 is provided with an anti-permeation layer 24 on the outside, the low-temperature resistant layer 23 on the outside of the anti-permeation layer 24, the low-temperature resistant layer 23 on the outside of the thermal insulation layer 22, and the anti-corrosion layer 21 on the outside of the thermal insulation layer 22;

[0033] The material of the anti-corrosion layer 21 is cross-linked polyethylene. Cross-linked polyethylene is a high-performance material in which polyethylene molecular chains are cross-linked by chemical or physical methods. Cross-linked polyethylene has good tolerance to most acids, alkalis and organic solvents and can be used for a long time in a corrosive environment without degradation. Cross-linked polyethylene has higher heat resistance and can maintain its mechanical properties and chemical stability under high temperature conditions.

[0034] The material of the thermal insulation layer 22 is foamed polypropylene, which is a lightweight and durable material with good thermal insulation and mechanical properties, and a very low thermal conductivity coefficient, which can effectively block heat transfer and provide good thermal insulation effect;

[0035] The material of the low-temperature resistant layer 23 is linear low-density polyethylene, which can still maintain its flexibility and mechanical strength in a low-temperature environment and is not prone to brittle cracking or breaking, which can significantly improve the service life and reliability of the MPP insulation pipe in a low-temperature environment;

[0036] The material of the anti-permeation layer 24 is polyvinylidene chloride, which is a highly efficient anti-permeation material with extremely low gas and water vapor permeability, which can effectively prevent the penetration of gas and water, improve the sealing of the pipeline, have good chemical stability, can resist the erosion of many chemicals, extend the service life of the pipeline, have good heat resistance, and can maintain its performance within a certain temperature range;

[0037] The material of the support layer 25 is a polyester fiber reinforced layer. The polyester fiber reinforced layer is a commonly used support material with good tensile strength and modulus, which can effectively enhance the tensile resistance and pressure resistance of the pipeline. Compared with metal, polyester fiber has a lower density, which can reduce the weight of the pipeline and facilitate transportation and installation.

[0038] A plurality of longitudinal support strips 26 are longitudinally arranged inside the support layer 25. The material of the longitudinal support strips 26 is a carbon fiber reinforced layer. The carbon fiber reinforced layer is a commonly used high-performance support material. Carbon fiber has extremely high tensile strength and modulus, and is an excellent structural material. It can effectively enhance the tensile strength and pressure resistance of the pipeline. Carbon fiber has a lower density and is lighter than metal of the same weight, which can reduce the weight of the pipeline and reduce transportation and installation costs. Carbon fiber has good fatigue resistance and can maintain stable performance under long-term dynamic loads. It can effectively reduce the extrusion deformation of the pipeline caused by external pressure during transportation and installation, improve the compressive resistance of the pipeline, and effectively prevent the deformation of the pipeline caused by factors such as gravity and internal pressure during long-term operation, so as to maintain the original shape and size of the pipeline.

[0039] The material of the protective layer 3 is epoxy resin coating, which can effectively resist the erosion of chemical substances such as acids and alkalis, protect the pipeline surface from corrosion, has high hardness and wear resistance, can protect the pipeline surface from physical wear, has good weather resistance, and can maintain its stable performance under different environmental conditions.

[0040] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A low temperature resistant MPP insulation pipe, characterized by: It comprises an MPP pipe base layer (1), an intermediate layer (2) is arranged on the outer side of the MPP pipe base layer (1), a protective layer (3) is arranged on the outer side of the intermediate layer (2), and an inner layer (4) is arranged on the inner side of the MPP pipe base layer (1).

2. The low temperature resistant MPP insulation pipe according to claim 1, characterized in that: A plurality of circular support rings (5) are slidably connected inside the inner layer (4); the material of the inner layer (4) is polytetrafluoroethylene, and the material of the circular support rings (5) is polyethylene.

3. The low temperature resistant MPP insulation pipe according to claim 2, characterized in that: A plurality of longitudinal limit blocks (41) are arranged on the inner side of the inner layer (4), a plurality of longitudinal sliding grooves (51) adapted to the longitudinal limit blocks (41) are opened inside the circular support ring (5), and the circular support ring (5) and the inner layer (4) are slidably connected via the longitudinal limit blocks (41) and the longitudinal sliding grooves (51).

4. The low temperature resistant MPP insulation pipe according to claim 1, characterized in that: The intermediate layer (2) is composed of an anti-corrosion layer (21), a thermal insulation layer (22), a low-temperature resistant layer (23), an anti-permeation layer (24), and a support layer (25); the support layer (25) is provided with an anti-permeation layer (24) on the outside, the low-temperature resistant layer (23) is provided on the outside of the anti-permeation layer (24), the low-temperature resistant layer (23) is provided with a thermal insulation layer (22) on the outside, and the anti-corrosion layer (21) is provided on the outside of the thermal insulation layer (22).

5. The low temperature resistant MPP insulation pipe according to claim 4, characterized in that: The material of the anti-corrosion layer (21) is cross-linked polyethylene, the material of the thermal insulation layer (22) is foamed polypropylene, the material of the low-temperature resistant layer (23) is linear low-density polyethylene, the material of the anti-permeation layer (24) is polyvinylidene chloride, and the material of the support layer (25) is a polyester fiber reinforced layer.

6. The low temperature resistant MPP insulation pipe according to claim 5, characterized in that: A plurality of longitudinal support strips (26) are longitudinally arranged inside the support layer (25), and the material of the longitudinal support strips (26) is a carbon fiber reinforced layer.

7. The low temperature resistant MPP insulation pipe according to claim 1, characterized in that: The material of the protective layer (3) is epoxy resin coating.

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