Online biaxial orientation flame-retardant power tube and connection structure

Abstract

The utility model relates to the field of cable pipelines and pipeline fittings, and provides an online biaxial orientation flame-retardant power pipe which comprises a pipe body, hydrophobic coatings are arranged on the outer wall of the pipe body, and the hydrophobic coatings are annularly distributed on the outer surface of the pipe body at intervals. The hydrophobic coatings are annularly distributed on the outer surface of the pipe body at intervals, on one hand, glue can be conveniently used for connecting pipelines to form a sealing structure, and on the other hand, on the premise that glue sealing fails, the annular hydrophobic layers are used for forming an annular isolation belt to prevent underground water and other external water from leaking along the pipelines. If the connecting structure is also provided with a corresponding hydrophobic ring, direct insertion can be realized by utilizing the characteristics of the hydrophobic layer under the condition of no glue, and water seepage under certain water pressure is prevented. The intervals of the circular ring sections formed by the hydrophobic coatings are the same, so that part of the pipe body can be cut out at will to be matched with a connecting structure, and connection of different lengths can be achieved.

Description

Technical Field

[0001] This application relates to the field of power pipes and pipe connectors, and more particularly to an online biaxially oriented flame-retardant power pipe and its connection structure. Background Technology

[0002] Online biaxial orientation is a pipe manufacturing process where molten material is extruded through a specially designed mold. Simultaneously, axial stretching and circumferential expansion technologies are used to achieve biaxial orientation, significantly enhancing the ordered arrangement of the pipe's molecular chains, thereby improving strength and toughness. Compared to ordinary pipes, pipes produced by this process have highly oriented molecular chains, significantly improving their mechanical strength and toughness, enabling them to withstand greater external forces and impacts. Therefore, power pipes produced by this process have higher ring stiffness. Furthermore, to ensure the pipe's flame retardant, fire resistance, and weather resistance, a large amount of flame retardant and other additives are added, ensuring it extinguishes within one second of being removed from the flame. This further increases the pipe's stiffness and rigidity. However, pipe connections typically require adhesives. If the adhesive is not fully dry during connection, accidental pulling or rotating of the pipe, or vibration of the pipe, can affect the adhesive's bonding effect, leading to localized leaks. Especially in the railway sector, the design and quality of power pipelines must comply with relevant standards such as the Railway Power Design Code and the High-Speed ​​Railway Power Engineering Construction Quality Acceptance Standard. These standards are more stringent than those for highways and municipal roads. Therefore, those that meet the quality requirements for railway construction generally also meet the construction needs of highways and municipal roads. In the railway sector, a large number of power pipes are installed in the same power conduit. If we wait for the adhesive to dry completely before proceeding with further construction, it will be very time-consuming. If the pipes slip accidentally during continuous construction and installation, resulting in loose connections, groundwater may leak into the pipes.

[0003] Chinese patent number "CN114923054B" entitled "A PVC sewage pipe structure and its connection method" discloses a pipe structure and a connection method. However, the pipe uses a sealed structure for sealing, which is different from ordinary glue connection and does not solve the problem of easy water leakage of glue connection. Utility Model Content

[0004] This application provides an online biaxially oriented flame-retardant power pipe and connection structure to at least solve the technical problem of easy water leakage in the connection of the prior art.

[0005] According to this application, an online biaxially oriented flame-retardant power tube is provided, including a tube body, and a hydrophobic coating is provided on the outer wall of the tube body. The hydrophobic coating is distributed in a ring-shaped interval on the outer surface of the tube body.

[0006] Compared with existing technologies, the online biaxially oriented flame-retardant power conduit of this application has the following advantages: the hydrophobic coating is distributed in a ring-shaped interval on the outer surface of the conduit body. On the one hand, it is convenient to use glue to connect the pipes to form a sealed structure. On the other hand, in the event that the glue seal fails, the ring-shaped hydrophobic layer forms a ring-shaped isolation zone to prevent external water such as groundwater from seeping along the pipe. If a corresponding hydrophobic ring is also set in the connection structure, the characteristics of the hydrophobic layer can be used to achieve direct insertion without glue and prevent water seepage under certain water pressure.

[0007] In one embodiment, the annular segments formed by the hydrophobic coating are spaced at the same interval, so that parts of the tube can be cut at will to match the connecting structure, and connections of different lengths can be achieved.

[0008] In one embodiment, the outer surface of the tube is provided with a concave or convex locking part, and the end face of the tube is a conical surface. This allows for subsequent processing using separate equipment after the tube is formed. Grooving is relatively easy and can be achieved by heating, or it can be directly hot-pressed on the outer tube wall using a high-temperature mold at around 200°C. Setting a protruding structure requires adding corresponding parts for processing or secondary injection molding.

[0009] In one embodiment, the pipe body includes a protective layer, a support layer, and an inner coating. The protective layer is an epoxy polymer layer that is resistant to ultraviolet rays, corrosion, aging, and degradation. The support layer is formed by online biaxial orientation co-extrusion of PVC particles. This gives the pipe body excellent properties of resistance to ultraviolet rays, corrosion, aging, and degradation, reducing the requirements for the storage and stacking environment and transportation of the pipe. It is especially suitable for use in long-term maritime transportation and harsh environmental conditions, resulting in a longer service life, better performance, and higher reliability of the pipe.

[0010] In one embodiment, the inner coating is a nano-coating and the spraying area is half the area of ​​the inner wall. The nano-coating can reduce frictional resistance and make the surface less prone to wear. During construction, it can reduce the resistance of threading and reduce the spraying area to reduce the cost of spraying.

[0011] In one embodiment, the inner wall is provided with several spherical pits. Cables placed inside the pipe for a long time are prone to sticking together. The uneven structure can make it less likely for the cables to stick to the power pipe.

[0012] An online biaxially oriented flame-retardant power pipe connection structure is disclosed for connecting the aforementioned power pipes. It includes a locking portion and a connecting portion. The connecting portion is coated with a hydrophobic coating in a ring shape, distributed at the same spacing as the hydrophobic coating on the pipe body. The locking portion is located at both ends of the connecting portion, and the locking portion matches the locking portion to achieve a locking function. Utilizing the properties of the hydrophobic layer, excellent sealing performance can be achieved without using a large amount of glue, thus making it more environmentally friendly. Of course, glue can be used for reinforcement to ensure a stronger connection; the glue is applied to the non-hydrophobic layer area for better adhesion.

[0013] In one embodiment, an annular rib is provided at the center of the connecting part, and an annular sealing ring is provided on the annular rib. The annular sealing ring is installed on the annular rib by providing an annular groove, which facilitates the positioning of the sealing ring and ensures better sealing performance.

[0014] In one embodiment, the annular sealing ring has tapered surfaces at both ends that match the tapered surface of the pipe body, thus achieving a better sealing effect.

[0015] In one embodiment, the locking part on the pipe body is a triangular locking groove, and the locking part of the connecting structure includes an elastic locking arm and a triangular locking hook. The triangular locking hook matches the triangular locking groove and uses at least one locking surface to restrict axial movement. The elastic locking arm extends outward a certain distance and then extends towards the center of the pipe body, so that there is a gap between the elastic locking arm and the pipe body in the installed state, which facilitates disassembly.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which:

[0018] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0019] Figure 1 A schematic diagram of the end structure of the online biaxially oriented flame-retardant power tube according to an embodiment of this application is shown;

[0020] Figure 2 A schematic diagram of the connection structure of the online biaxially oriented flame-retardant power pipe according to an embodiment of this application is shown;

[0021] Figure 3 A schematic diagram of the annular sealing ring of the online biaxial orientation flame-retardant power pipe connection structure according to an embodiment of this application is shown;

[0022] Figure 4 This paper shows a schematic diagram of the connection status of an online biaxially oriented flame-retardant power pipe according to an embodiment of this application;

[0023] Figure 5 This paper shows a cross-sectional schematic diagram of the connection state of the online biaxially oriented flame-retardant power pipe and its connection structure according to an embodiment of this application;

[0024] Figure 6 A schematic diagram of the online biaxially oriented flame-retardant power pipe and its connection structure according to an embodiment of this application is shown;

[0025] Figure 7 This paper shows a cross-sectional schematic diagram of an embodiment of the online biaxially oriented flame-retardant power pipe and its connection structure.

[0026] Figure 8 A schematic diagram of the structure of an online biaxially oriented flame-retardant power tube according to an embodiment of this application is shown. Detailed Implementation

[0027] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Example 1:

[0029] like Figure 1 As shown, a company has developed a CNSTO pipe, which is an online biaxially oriented flame-retardant electrical conduit. It includes a pipe body 1, with a hydrophobic coating 10 on the outer wall of the pipe body 1. The hydrophobic coating 10 is distributed in a ring-shaped pattern on the outer surface of the pipe body 1. The hydrophobic coating 10 is applied using a superhydrophobic coating sprayed along the ring. The contact angle between the superhydrophobic coating and water droplets is greater than 150 degrees. Rotating the CNSTO pipe during the spraying process forms the ring. A plastic protective film can be placed in the intermittent areas to achieve the intermittent spraying of hydrophobic material. In areas without the hydrophobic coating 10, adhesive is used for stronger adhesion. Even without adhesive, the hydrophobic coating 10 can still prevent low-pressure external groundwater from seeping into the pipe.

[0030] like Figure 1 As shown, the annular segments formed by the hydrophobic coating 10 are spaced at the same distance, which facilitates matching with the position of the connecting structure.

[0031] like Figure 1 As shown, the outer surface of the tube body 1 is provided with a concave or convex locking part 18, and the end face of the tube body 1 is a conical surface 17.

[0032] Example 2:

[0033] like Figures 2-5 As shown, an online biaxially oriented flame-retardant CNSTO power pipe connection structure is used to connect the aforementioned CNSTO power pipe. It includes a locking part 3 and a connecting part 2. The connecting part 2 is provided with a hydrophobic coating 10, which is distributed in a ring at the same spacing as the hydrophobic coating 10 on the pipe body 1. The locking part 3 is located at both ends of the connecting part 2, and matches with the locking part 18 to achieve a locking function. The online biaxially oriented flame-retardant CNSTO power pipe has high ring stiffness and is not easily deformed. Therefore, multiple circular holes 33 are provided in the locking part 3 to make it easier for the locking part 3 to undergo elastic deformation and achieve the locking function.

[0034] like Figure 3 and Figure 5 As shown, the connecting part 2 has an annular rib 20 at its center, and the annular rib 20 has an annular sealing ring 4. The annular sealing ring 4 is installed on the annular rib 20 by setting an annular groove 40.

[0035] like Figure 1 and Figure 3 As shown, the annular sealing ring 4 has tapered surfaces 41 at both ends that match the conical surface 17 of the pipe body 1. When installed, the tapered surfaces 41 surround the outside of the conical surface 17.

[0036] Example 3:

[0037] like Figure 1 , Figure 6 and Figure 7 As shown, the locking part 18 on the pipe body 1 is a triangular locking groove 16. The locking part 3 of the connecting structure includes an elastic locking arm 31 and a triangular locking hook 32. The triangular locking hook 32 matches the triangular locking groove 16 and uses at least one locking surface 33 to restrict axial movement. The elastic locking arm 31 extends outward a certain distance and then extends towards the center of the pipe body 1, so that there is a gap between the elastic locking arm 31 and the pipe body 1 in the installed state. This facilitates disassembly, and in special circumstances, the elastic locking arm 31 can be directly destroyed to achieve quick removal.

[0038] Example 4:

[0039] like Figure 8As shown, the pipe body 1 includes a protective layer 11, a support layer 12, and an inner coating layer 13. The protective layer 11 is an epoxy polymer layer that is resistant to ultraviolet rays, corrosion, aging, and degradation. The support layer 12 is formed by online biaxial orientation co-extrusion of PVC particles. The inner coating layer 13 is a nano-coating with a sprayed area of ​​half the area of ​​the inner wall 14. The support layer 12 and the protective layer 11 can be formed simultaneously using online biaxial orientation co-extrusion technology, while the nano-coating needs to be sprayed separately after forming. The inner wall 14 has several spherical recesses 15. The spherical recesses 15 are also processed separately using a vibration mold after the pipe body 1 is formed using online biaxial orientation co-extrusion technology.

[0040] According to the relevant requirements for railway subgrade design loads, for example, the design of railway subgrade cable trough (well) covers should consider the requirements for the passage of maintenance personnel and the placement of small track maintenance machinery. The standard value for the load on the passage of maintenance personnel is a uniformly distributed load of 3 kN / m²; the standard value for the load on small track maintenance machinery is a concentrated load of 1.5 kN. The load on the cable trough (well) itself is the static earth pressure of the subgrade fill. The static earth pressure coefficient is calculated as 0.45, and the fill unit weight is calculated as 22 kN / m³. The height of the cable trough is usually less than 1 m, therefore the pressure on the cable pipe is much less than 22 kN / m², and therefore the ring stiffness requirement for the cable pipe is also much less than 22 kN / m². The online biaxial orientation flame-retardant CNSTO power pipe ring stiffness test method of this application conforms to the standards in Table 1 below:

[0041] Table 1

[0042]

[0043] When the ring stiffness is greater than 25 kN / m², it basically does not deform under small forces. Therefore, the connection structure needs to be designed with a certain deformation capacity. Other performance tests of the online biaxial orientation flame-retardant CNSTO power pipe of this application meet the standards in Table 2 below:

[0044] Table 2

[0045]

[0046] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An online biaxially oriented flame-retardant power tube, characterized in that: Includes a tube body (1), the outer surface of the tube body (1) is provided with a concave or convex locking part (18), the outer wall of the tube body (1) is provided with a hydrophobic coating (10), the hydrophobic coating (10) is distributed in a ring-shaped interval on the outer surface of the tube body (1).

2. The online biaxially oriented flame-retardant power tube according to claim 1, characterized in that: The annular segments formed by the hydrophobic coating (10) have the same spacing.

3. The online biaxially oriented flame-retardant power tube according to claim 1 or 2, characterized in that: The end face of the tube (1) is a conical surface (17).

4. The online biaxially oriented flame-retardant power tube according to claim 3, characterized in that: The tube body (1) includes a protective layer (11), a support layer (12) and an inner coating layer (13). The protective layer (11) is an epoxy polymer layer that is resistant to ultraviolet rays, corrosion, aging and degradation. The support layer (12) is formed by online biaxial orientation co-extrusion of PVC particles.

5. The online biaxially oriented flame-retardant power tube according to claim 4, characterized in that: The inner coating (13) is a nano-coating and the sprayed area is half the area of ​​the inner wall (14) of the tube (1).

6. The online biaxially oriented flame-retardant power tube according to claim 5, characterized in that: The inner wall (14) of the tube (1) is provided with several spherical pits (15).

7. An online biaxially oriented flame-retardant power pipe connection structure, characterized in that: For connecting the online biaxially oriented flame-retardant power tube according to any one of claims 3-6, it includes a locking part (3) and a connecting part (2). The connecting part (2) is provided with a hydrophobic coating (10). The hydrophobic coating (10) is annular and distributed at the same spacing as the hydrophobic coating (10) on the tube body (1). The locking part (3) is located at both ends of the connecting part (2). The locking part (3) matches the locking part (18) to realize the locking function.

8. The online biaxially oriented flame-retardant power pipe connection structure according to claim 7, characterized in that: The connecting part (2) has an annular rib (20) at its center, and the annular rib (20) has an annular sealing ring (4). The annular sealing ring (4) is installed on the annular rib (20) by setting an annular groove (40).

9. The online biaxially oriented flame-retardant power pipe connection structure according to claim 8, characterized in that: The annular sealing ring (4) has tapered surfaces (41) at both ends that match the conical surface (17) of the tube body (1).

10. The online biaxially oriented flame-retardant power pipe connection structure according to claim 9, characterized in that: The locking part (18) on the tube body (1) is a triangular locking groove (16). The locking part (3) of the connecting structure includes an elastic locking arm (31) and a triangular locking hook (32). The triangular locking hook (32) matches the triangular locking groove (16) and uses at least one locking surface (33) to restrict axial movement. The elastic locking arm (31) extends outward a certain distance and then extends towards the center of the tube body (1), so that there is a gap between the elastic locking arm (31) and the tube body (1) in the installation state.

Images