Reinforced polypropylene electrical power pipe

Abstract

The utility model relates to electric power pipe technical field discloses a reinforced polypropylene electric power pipe, including the pipe body, the pipe body includes polypropylene inner layer, short glass fiber reinforced layer, polyester reinforcing layer and polypropylene outer layer from inside to outside in proper order, be equipped with the hydrophilic wet layer between polyester reinforcing layer and polypropylene outer layer, be equipped with a plurality of radial micro -holes in the polypropylene outer layer, the radial micro -hole is conical circular truncated cone hole shape, and the size is big outside small in; The radial micro -hole is uniformly distributed along the length extension direction of the pipe body, and is arranged in the 120 degree range of the top of the pipe body, the inner wall of radial micro -hole is equipped with hydrophobic coating. Solve the problem that the polyester reinforcing layer is prone to hydrolytic aging phenomenon when the electric power pipe is buried or exposed to humid environment in the prior art, leading to the problem of tensile strength decline, long-term reliability reduces.

Description

Technical Field

[0001] This utility model relates to the field of power pipe technology, and in particular to an enhanced polypropylene power pipe. Background Technology

[0002] Currently, most construction projects use MPP standard power conduits. MPP pipes are trenchless power conduits made primarily of modified polypropylene. Their installation eliminates the need for extensive dredging, excavation, and road surface damage, making them suitable for use in special locations such as roads, railways, buildings, and riverbeds. Compared to the traditional trenching method, trenchless power conduit projects are more environmentally friendly, avoiding the dust, traffic congestion, and other disturbances caused by traditional construction. Furthermore, trenchless power conduits can be laid in areas where excavation is not feasible, such as historical sites, urban areas, crop and farmland protection zones, highways, and rivers.

[0003] Ordinary MPP power pipes on the market have problems such as generally poor resistance to deformation after heating, weak creep resistance and tensile strength during construction and use, and short service life. In the existing technology, some companies use polyester reinforcement layers to enhance the performance of power pipes. However, when the power pipes are buried underground or exposed to humid environments, the polyester reinforcement layer is prone to hydrolytic aging (ester bond hydrolysis of PET molecules), which leads to a decrease in tensile strength and a reduction in long-term reliability. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an enhanced polypropylene power pipe to solve the problem in the prior art that when the power pipe is buried underground or exposed to a humid environment, the polyester reinforcement layer is prone to hydrolysis and aging, which leads to a decrease in tensile strength and a reduction in long-term reliability.

[0005] This utility model solves the above-mentioned technical problems through the following technical means: an enhanced polypropylene power pipe, comprising a pipe body, wherein the pipe body comprises, from the inside out, a polypropylene inner layer, a short glass fiber reinforcement layer, a polyester reinforcement layer and a polypropylene outer layer, wherein a hydrophilic moisture-wicking layer is provided between the polyester reinforcement layer and the polypropylene outer layer, and a plurality of radial micropores are provided through the polypropylene outer layer, wherein the radial micropores are in the shape of a conical frustum and are larger in size on the inside and smaller on the outside; the radial micropores are evenly distributed along the length extension direction of the pipe body and are set within a 120° range at the top of the pipe body, and the inner wall of the radial micropores is provided with a hydrophobic coating.

[0006] Optionally, the hydrophobic coating is applied to the radial micropores from the inside out, and the coating thickness increases linearly, ranging from 0.8 to 2.0 μm. By setting a hydrophobic coating with varying thickness, the entire radial micropore is shaped like a frustum of a cone, with the inner part being larger than the outer part, achieving a "one-way valve effect": internal moisture can be discharged by capillary force, while external liquid water cannot seep in due to the high surface tension of the hydrophobic coating.

[0007] Optionally, the contact angle of the hydrophobic coating is greater than 150°. This ensures the high surface tension of the hydrophobic coating.

[0008] Optionally, the opening rate within a 120° range at the top of the pipe is 5%-8%. In power pipe laying projects, a natural ventilation zone is sometimes set up. The natural ventilation zone is usually located in an arc-shaped area of ​​about 120° at the top of the pipe. An opening is made in the top area of ​​the pipe, and the gap between the soil cover layer and the pipe is used to form a micro-air circulation channel, thereby removing the moisture discharged outside the pipe and achieving a good dehumidification effect.

[0009] Optionally, the polyester reinforcing layer adopts a mesh-woven structure. The mesh-woven polyester reinforcing layer forms longitudinally interconnected microchannels, which guide the directional migration of moisture through capillary action between fibers.

[0010] Optionally, the polyester reinforcing layer has its fibers oriented in an asymmetrical helical winding along the axial direction of the tube. This allows some fibers to bear circumferential stress, improving compressive and bending resistance, while others form low-resistance radial microchannels, enhancing moisture migration efficiency.

[0011] Optionally, the hydrophilic moisture-wicking layer is made of polyvinyl alcohol film or hydrophilic nonwoven fabric. It is used to absorb moisture within the polyester reinforcing layer.

[0012] The beneficial effects of this utility model are:

[0013] This invention incorporates a hydrophilic moisture-wicking layer to absorb moisture from the polyester reinforcement layer, which is then discharged through radial micropores penetrating the outer polypropylene layer. The inner walls of these radial micropores are coated with a hydrophobic layer of varying thickness, making the entire micropore a cone-shaped frustum, with a larger inner diameter and smaller outer diameter. This achieves a "one-way valve effect": internal moisture can be discharged via capillary force, while external liquid water cannot seep back in due to the high surface tension of the hydrophobic coating. This effectively solves the problem of hydrolytic aging of the polyester reinforcement layer when power pipes are buried underground or exposed to humid environments, thus delaying the aging and failure of the polyester reinforcement layer and ensuring the reliability of the power pipe. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2This is a cross-sectional schematic diagram of the tube body of this utility model;

[0016] Figure 3 for Figure 2 A magnified view of a portion of point M in the middle.

[0017] Among them, 1-tube body, 11-polypropylene inner layer, 12-polyester reinforcing layer, 13-hydrophilic moisture-wicking layer, 14-polypropylene outer layer, 141-radial micropores, 142-hydrophobic coating. Detailed Implementation

[0018] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the utility model. To better illustrate the embodiments of this utility model, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the figures for those skilled in the art.

[0019] In the figures of this utility model embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe the positional relationship in the figure are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

[0020] like Figures 1-3 As shown, this utility model discloses an enhanced polypropylene power pipe, comprising a pipe body 1. The pipe body 1 includes, from the inside out, a polypropylene inner layer 11, a short glass fiber reinforcement layer, a polyester reinforcement layer 12, and a polypropylene outer layer 14. A hydrophilic moisture-wicking layer 13 is provided between the polyester reinforcement layer 12 and the polypropylene outer layer 14. A plurality of radial micropores 141 are provided through the polypropylene outer layer 14. The radial micropores 141 are in the shape of a conical frustum, with the inner diameter larger than the outer diameter. The radial micropores 141 are evenly distributed along the length extension direction of the pipe body 1 and are set within a 120° range at the top of the pipe body 1. A hydrophobic coating 142 is provided on the inner wall of the radial micropores 141.

[0021] In this embodiment, the radial micropores 141 are coated with a hydrophobic coating 142 from the inside out, and the coating thickness increases linearly, ranging from 0.8 to 2.0 μm. For example, the hydrophobic coating 142 is a conventional fluorocarbon resin coating with a contact angle greater than 150°. This makes the inlet (inner) diameter of the radial micropores 141 larger than the outlet (outer) diameter. During the processing of the power pipe, the radial micropores 141 can be created by laser drilling, first opening through-holes of equal diameter in the polypropylene outer layer 14, and then coating with the hydrophobic coating 142 by electrostatic spraying or other methods, ultimately making the entire radial micropore 141 appear... Figure 3 The dimensions shown are of a cone-shaped frustum, with the inner part larger than the outer part.

[0022] In this embodiment, the opening rate within the top 120° range of the pipe body 1 is 5%-8%. In power pipe laying projects, natural ventilation zones are sometimes set up. The natural ventilation zone is usually located in the arc-shaped area of ​​about 120° at the top of the pipe body, and air micro-circulation channels are formed by utilizing the gap between the soil cover layer and the pipe.

[0023] In this embodiment, the polyester reinforcing layer 12 adopts a mesh weave structure. Specifically, the fiber orientation of the polyester reinforcing layer 12 is asymmetrically spirally wound with respect to the axial direction of the tube body 1. For example, 30° and 60° asymmetrical spiral winding is used. The 60° fibers are used to bear circumferential stress and improve compressive and bending resistance, while the 30° fibers form low-resistance radial microchannels to enhance moisture migration efficiency.

[0024] In this embodiment, the hydrophilic moisture-wicking layer 13 is made of polyvinyl alcohol film or hydrophilic nonwoven fabric. The hydrophilic moisture-wicking layer 13 has higher hydrophilicity and is used to adsorb moisture in the polyester reinforcing layer 12, which is then discharged through radial micropores 141.

[0025] It should be understood that the micron-sized openings such as radial micropores 141 are much smaller than the size of the tube body 1 and only penetrate the outer polypropylene layer 14, so they have little impact on the strength of the tube body 1. At the same time, since the radial micropores 141 are arranged in an equally spaced array, the stress is evenly distributed, which also reduces the risk of failure caused by stress concentration.

[0026] The working principle of this utility model is as follows:

[0027] This utility model's power conduit incorporates a hydrophilic moisture-wicking layer 13 to absorb moisture from the polyester reinforcing layer 12, which is then discharged through radial micropores 141 penetrating the outer polypropylene layer 14. The inner wall of the radial micropores 141 is coated with a hydrophobic layer of varying thickness, making each micropore a conical frustum-shaped hole with a larger inner diameter than an outer diameter. This achieves a "one-way valve effect": internal moisture can be discharged through the radial micropores 141 via capillary force, while external liquid water cannot seep in due to the high surface tension of the hydrophobic coating 142. This effectively solves the problem of hydrolysis and aging of the polyester reinforcing layer when the power conduit is buried underground or exposed to humid environments. Compared to other conventional modification methods, it can effectively remove moisture and prevent the "steaming" phenomenon.

[0028] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

Claims

1. A reinforced polypropylene power tube, comprising a tube body (1), the tube body (1) comprising in sequence from inside to outside a polypropylene inner layer (11), a short glass fiber reinforced layer, a polyester reinforced layer (12) and a polypropylene outer layer (14), characterized in that: A hydrophilic moisture-wicking layer (13) is provided between the polyester reinforcing layer (12) and the polypropylene outer layer (14). A plurality of radial micropores (141) are provided through the polypropylene outer layer (14). The radial micropores (141) are in the shape of a cone-shaped frustum, and the size is larger inside and smaller outside. The radial micropores (141) are evenly distributed along the length extension direction of the tube body (1) and are set within a 120° range at the top of the tube body (1). The inner wall of the radial micropores (141) is provided with a hydrophobic coating (142).

2. The reinforced polypropylene power tube according to claim 1, characterized in that: The radial micropores (141) are coated with the hydrophobic coating (142) from the inside out, and the coating thickness increases linearly with a gradient, ranging from 0.8 to 2.0 μm.

3. The reinforced polypropylene power tube of claim 2, wherein: The contact angle of the hydrophobic coating (142) is greater than 150°.

4. The reinforced polypropylene power tube of claim 1, wherein: The opening rate of the tube (1) within a 120° range at the top is 5%-8%.

5. The reinforced polypropylene power tube of claim 1, wherein: The polyester reinforcing layer (12) adopts a mesh weave structure.

6. The reinforced polypropylene power tube of claim 5, wherein: The fiber orientation of the polyester reinforcement layer (12) is asymmetrically spirally wound with respect to the axial direction of the tube body (1).

7. The reinforced polypropylene power tube of claim 1, wherein: The hydrophilic moisture-wicking layer (13) is made of polyvinyl alcohol film or hydrophilic nonwoven fabric.

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