Fuel gas conveying pipeline structure capable of being sleeved with optical fibers and production mold of fuel gas conveying pipeline structure

Abstract

The utility model discloses a gas pipeline structure capable of being sleeved with optical fibers and a production mold of the gas pipeline structure, and relates to the field of plastic pipelines. Comprising a pipeline body and auxiliary pipes, the multiple auxiliary pipes evenly surround the pipeline body, the pipeline body and the auxiliary pipes are in arc transition, and the pipeline body and the auxiliary pipes are made of plastic and are integrally designed. Comprising a plasticizing extrusion die and a vacuum shaping tool, the plasticizing extrusion die is provided with a first body pipe orifice die and a second body pipe orifice die which are connected, the second body pipe orifice die and a third body pipe orifice die which are connected, a body pipe core rod penetrates through the center of the plasticizing extrusion die, and the plasticizing extrusion die is provided with a plurality of small pipe core rods which are uniformly arranged in the first body pipe orifice die; and the through hole penetrating through the second body pipe orifice mold is in threaded connection with the third body pipe orifice mold.

Description

Technical Field

[0001] The utility model relates to the field of plastic pipes, in particular to a gas transmission pipe structure capable of being covered with optical fibers and a production mold thereof. Background Art

[0002] Natural gas and pipeline-transmitted gas are clean energy sources whose use is rapidly expanding. Natural gas and gas transmission pipelines generally consist of metal and non-metallic pipes. Metal pipes offer better tracing and positioning performance, but their corrosion resistance and service life are inferior to those of non-metallic pipes. Non-metallic pipes are primarily buried PE pipes. Due to their ease of installation, corrosion resistance, and long service life, PE pipes have become the preferred choice for low- and medium-pressure gas pipelines in cities. However, tracing and positioning are not effective, requiring auxiliary tracer tape, tracer boards, and warning signs. In urban construction, safety accidents involving PE pipelines being dug through are common due to inaccurate positioning on PE gas pipeline construction drawings and inaccurate on-site pipe location. Avoiding safety hazards and early prevention are of paramount concern to gas operators.

[0003] With the mature application of satellite positioning technology and fiber optic positioning system technology, the application of precise positioning technology to gas pipelines has become an urgent need for gas operators. For example, in the publication number CN205244640U "PE pipes capable of installing fiber optic sensors," the problem of existing PE pipes being inconvenient for sensor installation was solved by designing PE pipes capable of installing fiber optic sensors. However, the drawbacks were that the split design was not strong enough, and a single auxiliary pipe could not accommodate the installation of multiple optical fibers. Positioning optical fibers are generally attached to the outer surface of the pipeline after it is laid. This case proposes a gas transmission plastic pipe that can be fitted with positioning optical fibers. Utility Model Content

[0004] The purpose of the utility model is to provide a gas transmission pipeline structure capable of being covered with optical fiber and a production mold thereof.

[0005] In order to achieve the above-mentioned purpose of the invention, the technical solution provided by the utility model is as follows: a gas transmission pipeline structure that can be covered with optical fiber, including a pipeline body and a subsidiary pipe, characterized in that: the pipeline body is evenly surrounded by a plurality of subsidiary pipes, there is an arc-shaped transition between the pipeline body and the subsidiary pipes, the pipeline body and the subsidiary pipes are made of plastic, and the pipeline body and the subsidiary pipes are designed as an integrated whole.

[0006] Furthermore, the inner diameter of the auxiliary tube is 3-10 times the outer diameter of the optical fiber cable, the wall thickness of the auxiliary tube is 2-4 times the outer diameter of the optical fiber cable, and the pipe body and both ends of the auxiliary tube can be covered with port dust caps, and the port dust cap is surrounded by a first protrusion with the same shape as the auxiliary tube.

[0007] A production mold for a gas transmission pipeline structure that can be covered with optical fibers, including a plasticizing extrusion mold and a vacuum forming tooling, characterized in that: the plasticizing extrusion mold has a first main body pipe mouth mold connected to a second main body pipe mouth mold, and the second main body pipe mouth mold is connected to a third main body pipe mouth mold, a main body pipe core rod passes through the center of the plasticizing extrusion mold, the plasticizing extrusion mold has a plurality of small pipe core rods evenly distributed inside the first main body pipe mouth mold and the second main body pipe mouth mold, and threadedly connected to the third main body pipe mouth mold, and the number of the small pipe core rods is the same as the number of auxiliary pipes.

[0008] Furthermore, the end of the small tube core rod has a threaded structure, the port of the third body tube mouth mold is embedded with a threaded structure, the interior of the second body tube mouth mold has a through hole, the through hole of the second body tube mouth mold has a square notch at one end close to the third body tube mouth mold, the small tube core rod passes through the through hole of the second body tube mouth mold, and a second protrusion 312 with the same shape as the auxiliary tube 31 is provided around the vacuum forming tooling 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of the cross-section of the pipeline body structure.

[0010] Figure 2 Schematic diagram of the port dust cap structure.

[0011] Figure 3 Schematic diagram of the plasticizing extrusion die structure.

[0012] Figure 4 This is a schematic diagram of the vacuum forming tooling structure.

[0013] Marked in the figure are: 1. Plasticizing extrusion die; 11. First main body nozzle die; 12. Second main body nozzle die; 13. Main body tube core rod; 14. Small tube core rod; 15. Third main body nozzle die; 2. Vacuum forming tooling; 3. Pipe body; 31. Auxiliary pipe; 311. First protrusion; 312. Second protrusion; 4. Port dust cap; 5. Through hole. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1The cross-sectional schematic diagram of the pipeline body structure shown includes a pipeline body 3 and a sub-pipe 31. The pipeline body 3 is the core part of the entire structure. It is a cylindrical pipe, usually used to transport fluids or gases. The sub-pipe 31 is evenly surrounded by the outside of the pipeline body 3 to form an annular structure. This layout helps to enhance the overall stability and strength of the pipeline. The connection between the pipeline body 3 and the sub-pipe 31 is an arc-shaped transition. This design can reduce stress concentration and improve the durability of the structure. The pipeline body 3 and the sub-pipe 31 adopt an integrated design, which means that they are processed as a whole during the manufacturing process, which can ensure the consistency and tightness of the structure. The pipeline body 3 and the sub-pipe 31 are both made of plastic material, which has the advantages of being light, corrosion-resistant, easy to process, and having a long service life. It helps to reduce the weight of the entire structure and is easy to install and maintain.

[0016] Based on the above, the inner diameter of the secondary tube 31 is designed to be 3-10 times the outer diameter of the optical fiber cable. This provides sufficient space for the optical fiber cable and ensures efficient and safe transmission within the tube. The wall thickness of the secondary tube 31 is designed to be 2-4 times the outer diameter of the optical fiber cable. This wall thickness ensures the structural strength of the secondary tube while avoiding excessive material consumption, achieving a balance between cost and performance.

[0017] On the basis of the above, if Figure 2 As shown in the schematic diagram of the port dust cap structure, the port dust cap (4) is surrounded by a first protrusion 311 with the same shape as the auxiliary pipe 31. The port dust cap 4 can be put on both ends of the pipe body 3 and the auxiliary pipe 31, providing a physical barrier for the pipe body 3 and the auxiliary pipe 31, which can effectively prevent dust and other pollutants from entering the interior of the pipe and keep the pipe system clean.

[0018] like Figure 3The plasticizing extrusion die structure schematic diagram shown in the figure shows that the plasticizing extrusion die 1 is composed of a multi-layer main body nozzle die, including a first main body nozzle die 11, a second main body nozzle die 12 and a third main body nozzle die 15. These main body nozzle dies are connected to each other to form a continuous pipe for guiding and shaping the flow of molten plastic. The main body tube core rod 13 passes through the center of the die and is a key component for forming the inner cavity of the pipe during the extrusion process. It works in conjunction with each main body nozzle die to ensure that the plastic material can form a uniform wall thickness and precise inner diameter size during extrusion. Several small tube core rods 14 are evenly distributed inside the first main body nozzle die 11 and the second main body nozzle die 12. These small tube core rods contribute to the uniform flow of plastic and are used to form the specific structural feature of the pipe, the auxiliary tube 31. The small tube core rod 14 is connected to the third main body nozzle die 15 by a thread. This connection method allows the internal structure of the mold to be fine-tuned to meet the extrusion requirements of plastics with different diameters and wall thicknesses. The design of the plasticizing extrusion die allows for adjustments according to changes in production requirements, such as changing the number of small tube core rods 14 or the threaded connection method, to accommodate the production of plastic products of different shapes and sizes.

[0019] On the basis of the above, the through hole 5 inside the second body nozzle mold 12 is a penetrating hole, and its existence plays an important role in the exhaust, pressure balance and material flow path of the mold. The through hole 5 can serve as a channel for the flow of molten plastic during the plasticizing extrusion process, which helps to achieve more uniform material distribution and a more stable extrusion process. Near one end of the third body nozzle mold 15, the through hole 5 is designed with a square notch. This design may be used to adapt to a specific extrusion shape or structure, for example, allowing the molten plastic to form a specific cross-sectional shape or reinforcement rib here. The small tube core rod 14 passes through the through hole 5 and the third body nozzle mold 15 for easy installation and disassembly. The vacuum forming tooling 2 is surrounded by a second protrusion 312 with the same shape as the auxiliary pipe 31. This shape design prevents the pipeline from unexpected deformation during the cooling and forming process, protecting the structure of the auxiliary pipe 31.

[0020] In one embodiment, when designing a PE gas pipe, to maintain its inherent safety and compliance while ensuring the same material, outer diameter, and pressure-bearing wall thickness, the present invention employs an innovative approach: a secondary pipe 31 is provided at each of the four circumferential divisions of the pipe body 3. The secondary pipes 31 are constructed from the same material as the pipe body 3, enabling a single extrusion process with the pipe body 3, ensuring the overall consistency and structural stability of the pipe.

[0021] Building on the aforementioned foundation, this integrated extrusion technology not only improves production efficiency but also helps ensure the safety and reliability of the pipeline during gas transportation. By providing a quartered secondary pipe 31 around the pipeline circumference, the design also cleverly provides a path for optical fiber cables to pass through. This is particularly useful in urban underground pipeline networks or where gas pipelines need to run parallel to communications networks.

[0022] On the basis of the above, this design selects the same material as the pipe body 3 to manufacture the auxiliary pipe 31, ensuring the consistency of the chemical and physical properties of the entire pipe. This material uniformity not only helps to improve the stability of the pipe system, but also facilitates subsequent connection and maintenance work. Through the one-time molding process, the pipe body 3 and the auxiliary pipe 31 are manufactured simultaneously during the production process, avoiding the error accumulation that may occur in the traditional multi-step assembly method, and reducing the defects that may occur in the production process. The one-time molding process significantly improves the degree of production automation and reduces additional assembly steps such as welding, bonding and other manual steps, thereby reducing the production cycle and complexity, thereby reducing labor costs, and improving product consistency and reliability through the precise control of automated equipment. The one-time molded pipe reduces the number of connection points, thereby reducing the potential risk of leakage and improving the overall quality and safety of the pipe. In addition, uniform wall thickness and precise dimensional control also help to improve the performance of the pipe.

[0023] Based on the above, the outer diameter of the optical fiber cable is set to d, which is the basic dimension of the optical cable and is crucial to the design of the auxiliary tube 31 on the pipeline body 3. The inner diameter of the auxiliary tube 31 is designed to be 3-10 times the outer diameter of the optical fiber cable, that is, 3d to 10d. This provides ample space for the optical fiber cable, ensuring that the optical cables can pass smoothly and maintain appropriate spacing, avoiding squeezing or other issues that may affect signal transmission. The wall thickness of the auxiliary tube 31 is designed to be 2-4 times d, that is, 2d to 4d, based on the outer diameter of the optical fiber cable. This wall thickness ensures the mechanical strength of the auxiliary tube 31 while controlling the weight and cost of the pipeline. The connection between the auxiliary tube 31 and the PE gas pipeline body 3 uses an arc-shaped transition, with the transition arc radius carefully designed to be 2-4 times d, that is, 2d to 4d. This design helps reduce stress concentration and extend the service life of the pipeline. The dimensions of the PE gas pipeline body 3 adhere to the dimensions specified in the national product standard, ensuring the universality and interchangeability of the pipeline while meeting the safety standards for gas transportation. Pipes are custom-made, typically in lengths of 9-12 meters, to accommodate diverse installation requirements and reduce on-site welding workload. This length also facilitates transportation and handling, balancing cost and efficiency.

[0024] On the basis of the above, the design and production of PE gas pipelines follow the national standard "Buried Polyethylene (PE) Pipeline System for Gas Part 1: Pipes" (GB / T 15558.1-2015). This standard stipulates the requirements for pipes, including size, pressure level and quality, to ensure the safety and reliability of the products.

[0025] In one embodiment, the pipe preparation process of the present invention is efficient and accurate, ensuring the quality and performance of the PE gas pipe. The following are the detailed steps of the PE gas pipe preparation process:

[0026] 1. Drying of Mixed Materials: Use black gas pipe-specific mixed materials and dry them at a strictly controlled temperature of 80±5°C for 2-4 hours to remove moisture from the mixed materials and ensure the processing properties of the materials. Alternatively, a dehumidifying dryer can be used for drying for at least 2 hours to ensure that the dryness of the mixed materials meets production requirements.

[0027] 2. Extruder preheating: The extruder part of the production line needs to be preheated synchronously. Set the extruder barrel temperature to 195-205℃ and preheat for 2-4 hours to ensure uniform temperature inside the extruder. Use a three-level gradient preheating method, increase the gradient temperature by one level every hour, set the initial temperature at 150-160℃, and the gradient temperature difference is 15℃ to achieve uniform preheating of the extruder.

[0028] 3. Vacuum feeding: After the extruder is preheated, the dry mixed materials are transported to the extruder hopper through the vacuum feeding system to ensure the continuity and uniformity of the feeding process.

[0029] 4. Plasticizing and extruding raw materials: The mixed materials are plasticized and melted in the plasticizing and extruding die 1 to form a uniform molten state, and then pushed by the screw of the extruder to achieve extrusion molding.

[0030] 5. Outer diameter shaping: The outer diameter of the molten blank is shaped in the vacuum shaping tool 2 to ensure the dimensional accuracy and surface smoothness of the pipe.

[0031] 6. Molten material bonding: The molten material after extrusion is bonded to the traction pipe to ensure the continuity and integrity of the pipeline.

[0032] 7. Spray cooling: The formed pipe body is cooled by the spray cooling system to quickly reduce the pipe body temperature and enhance the physical properties of the pipeline.

[0033] 8. Fixed-length cutting: Use a fixed-length cutting machine to cut the pipe according to the required length to ensure the consistency of the length of each pipe.

[0034] 9. Port dust-proof packaging: Finally, the cut pipe ports are dust-proofed and then packaged to protect the pipe ports from contamination and ensure the cleanliness and safety of the pipes.

[0035] In one embodiment, in the construction process of PE gas pipeline, although most steps are similar to traditional installation methods, the construction process has its own unique features due to the special design of the pipeline in this solution. The following are the detailed steps of the construction process:

[0036] 1. Removal of the heads of the auxiliary pipes 31: Before performing hot melt or electric fusion connection, it is necessary to remove the heads of the four auxiliary pipes 31 on the pipeline. This step is to ensure the cleanliness and contact area of the fusion area, so as to achieve a more solid connection.

[0037] 2. Butt Fusion (Electrofusion): After removing the auxiliary pipe 31, precisely butt the pipe ends according to the butt fusion process requirements. The length of the auxiliary pipe 31 removed during butt fusion should be 0.5-0.8 times the weld width, and the weld width should be 1.6-2.4 times the pressure-bearing wall thickness of the pipe to ensure a uniform and secure weld. The butt fusion process temperature is strictly controlled at 215±10°C, and the butt pressure is set according to the standard pressure of the automatic welding machine to ensure weld quality.

[0038] 3. Cooling and shaping: After the hot melt butt welding is completed, the pipe needs to be cooled in the cooling and shaping area to fix the weld shape and ensure the stability of the pipe connection.

[0039] 4. Inserting the optical fiber: After the pipeline has cooled, insert the optical fiber cable into the auxiliary pipe 31 reserved in the pipeline to ensure smooth passage and correct positioning of the optical fiber.

[0040] 5. Fiber optic end protection: After the optical fiber is inserted, the end of the optical fiber needs to be protected to prevent it from being damaged or interfered with by environmental factors.

[0041] 6. Pipeline buried in place: After the optical fiber installation is completed, the pipeline will be buried underground according to the design requirements to ensure that the pipeline position is accurate and in accordance with the provisions of the construction drawings.

[0042] 7. Pipeline sealing and strength test: After the pipeline is buried, the sealing and strength test is carried out to ensure the safety and reliability of the pipeline during the gas transportation process.

[0043] 8. Fiber optic connection to the operation command center positioning system: After completing all construction steps, connect the optical fiber to the positioning system of the operation command center to perform signal testing and system debugging to ensure the normal operation of the optical fiber communication system.

[0044] 9. Standardized parameters of automatic welding machine: All hot melt butt welding processes have standardized parameter settings in the automatic welding machine. These parameters are pre-set according to pipe specifications and welding requirements to ensure the consistency and quality of the welding process.

[0045] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas transmission pipeline structure capable of being covered with an optical fiber, comprising a pipeline body (3) and a secondary pipe (31), characterized in that: The pipeline body (3) is evenly surrounded by a plurality of auxiliary pipes (31); There is an arc-shaped transition between the pipeline body (3) and the auxiliary pipe (31); The wall thickness of the auxiliary tube (31) is 2-4 times the outer diameter of the optical fiber cable.

2. The optical fiber-encased gas transmission pipeline structure according to claim 1, characterized in that: The inner diameter of the auxiliary tube (31) is 3-10 times the outer diameter of the optical fiber cable.

3. A gas transmission pipeline structure capable of being covered with optical fiber according to claim 1 or 2, characterized in that: The pipe body (3) and the auxiliary pipe (31) are made of plastic; The pipeline body (3) and the auxiliary pipe (31) are designed as an integrated whole.

4. A gas transmission pipeline structure capable of being sheathed with optical fiber according to claim 1 or 2, characterized in that: Port dust caps (4) can be nested at both ends of the pipeline body (3) and the auxiliary pipe (31).

5. The gas transmission pipeline structure capable of being covered with optical fiber according to claim 4, characterized in that: The port dust cap (4) is surrounded by a first protrusion (311) having the same shape as the auxiliary pipe (31).

6. A production mold for a gas transmission pipeline structure capable of being covered with an optical fiber, comprising a plasticizing extrusion mold (1) and a vacuum shaping tool (2), characterized in that: The plasticizing extrusion die (1) comprises a first body pipe mouth die (11) connected to a second body pipe mouth die (12), and the second body pipe mouth die (12) connected to a third body pipe mouth die (15); A main body tube core rod (13) passes through the center of the plasticizing extrusion die (1); The plasticizing extrusion die (1) has a plurality of small tube core rods (14) evenly arranged inside the first body tube die (11) and the second body tube die (12), and threadedly connected to the third body tube die (15); The number of the small tube core rods (14) is the same as the number of the auxiliary tubes (31); A second protrusion (312) having the same shape as the auxiliary pipe (31) is provided around the vacuum shaping tool (2).

7. The production mold of a gas transmission pipeline structure capable of being covered with optical fibers according to claim 6, characterized in that: The end of the small tube core rod (14) has a thread structure; The third main body pipe mouth mold (15) has an embedded thread structure at its port.

8. The production mold of a gas transmission pipeline structure capable of being covered with optical fibers according to claim 6, characterized in that: The second main body nozzle mold (12) has a through hole (5) inside; The through hole (5) of the second main body pipe mouth mold (12) has a square notch at one end close to the third main body pipe mouth mold (15).

9. The production mold of a gas transmission pipeline structure capable of being covered with optical fibers according to claim 6, characterized in that: The small tube core rod (14) passes through the through hole (5) of the second main body tube mouth mold (12).

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