A fully self-anchoring flexible connection steel pipe

Abstract

This invention relates to a fully self-anchored flexible connection steel pipe, belonging to the technical field of fully self-anchored steel pipes. By setting an elastic sealing part, a tamping part, and a rebound part between the steel pipe bodies, an elastic connection system is formed. The elastic sealing part drives the tamping part to move elastically back and forth. The tamping part, passing through an air guide hole, drives the rebound part to intermittently seal against the inner wall of the steel pipe body at the spigot, allowing air to enter the pipe and form air bubbles. These air bubbles act as a buffer during fluid flow, effectively reducing the impact of pipe vibration on the fluid, thereby reducing fluid pressure fluctuations. Simultaneously, the air guide hole at the spigot helps regulate the speed at which air enters the pipe, further stabilizing the fluid pressure. This solves the problem in existing technologies where vibrations generated in the pipe are transmitted to the fluid inside the pipe, causing fluid pressure fluctuations.

Description

Technical Field

[0001] This invention belongs to the field of fully self-anchoring steel pipe technology, specifically relating to a fully self-anchoring flexible connection steel pipe. Background Technology

[0002] Self-anchoring flexible connection steel pipe is a high-strength, high-sealing pipe connection technology that is commonly used in urban water supply, underground integrated pipe corridors, fire protection pipe networks and long-distance water diversion projects. Its conventional structure includes a socket, spigot, sealing ring, open circular retaining ring, hook and boss. Self-anchoring connection is achieved by radial expansion and rebound deformation of the retaining ring.

[0003] However, under special working conditions such as fire-fighting pipeline water supply projects and oil and gas production areas where heavy-duty vehicles frequently pass, existing technologies have revealed significant defects: the dynamic loads exerted on the ground by frequently passing heavy-duty vehicles are transmitted to the buried pipeline through the soil medium, inducing high-frequency vibrations in the pipeline. This vibration energy is coupled to the fluid medium through the pipe wall, triggering hydrodynamic effects—especially the water hammer effect generated by periodic pressure fluctuations. Long-term effects lead to fatigue damage to the pipeline material, eventually causing interface sealing failure or pipe rupture accidents. Although the self-anchoring mechanism of existing structures can ensure static sealing, it lacks an active design for absorbing dynamic vibration energy, making the fluid-structure coupled vibration problem a technical bottleneck restricting the long-term reliability of pipelines. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a fully self-anchored flexible connection steel pipe, which solves the problem of fluid pressure fluctuations caused by the transmission of vibrations generated in the pipeline to the fluid inside the pipeline.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A fully self-anchoring flexible connection steel pipe includes several steel pipe bodies, with sockets and spigots formed at both ends of the steel pipe bodies. The steel pipe bodies are sequentially connected by the sockets and spigots. The pipe body also includes an elastic sealing part, a tamping part, and a rebound part connected to the elastic sealing part on the spigot. The elastic sealing part is located between the inner wall of the socket and the outer wall of the spigot. An air guide hole is provided on the steel pipe body at the spigot. The rebound part is located on the inner wall of the steel pipe body at the spigot. The elastic sealing part drives the tamping part to move elastically back and forth. The tamping part passes through the air guide hole and drives the rebound part to intermittently seal against the inner wall of the steel pipe body at the spigot, allowing air to enter the pipe and form air bubbles. The air bubbles are used to buffer pressure fluctuations generated during fluid flow.

[0007] As a further embodiment of the present invention, the number of air guide holes is several, and the air guide holes are evenly distributed along the axial direction directly above the steel pipe body.

[0008] As a further aspect of the present invention, the correspondence between the number of air guide holes n and the length L of the steel pipe body is: n = L / λ D +1, where λ is the air guide hole distribution coefficient and D is the nominal diameter of the pipe. This indicates the floor function.

[0009] As a further embodiment of the present invention, the elastic sealing part includes a plurality of first springs and a flexible sleeve sleeved on the outer wall of the socket, wherein the plurality of first springs are evenly disposed within the flexible sleeve.

[0010] As a further embodiment of the present invention, the first spring located on the axis directly above the steel pipe body is connected to the tamping part, and the tamping part is connected to the end of the first spring away from the socket.

[0011] As a further embodiment of the present invention, the diameter of the tamping part is greater than half the diameter of the air guide hole and less than the diameter of the air guide hole.

[0012] As a further embodiment of the present invention, the rebound part includes a limiting block and a second spring, the two ends of the second spring being connected to the limiting block and the inner wall of the steel pipe body at the insertion port, respectively.

[0013] As a further embodiment of the present invention, a flexible pad is provided between the limiting block and the air guide hole, the limiting block is cylindrical, and the diameter of the limiting block is larger than the diameter of the air guide hole.

[0014] As a further embodiment of the present invention, the tamping part is a tamping rod, and a guide groove is provided on the steel pipe body at the socket. The tamping rod slides through the guide groove, and the diameter of the guide groove is larger than the diameter of the tamping rod.

[0015] As a further embodiment of the present invention, an air guide pipe is provided on the guide groove, and the air guide pipe is connected to the outside.

[0016] The beneficial effects of this invention are as follows:

[0017] By setting an elastic sealing part, a tamping part, and a rebound part between the steel pipe bodies, an elastic connection system is formed. The elastic sealing part drives the tamping part to move elastically back and forth. The tamping part, through the air guide hole, drives the rebound part to intermittently seal against the inner wall of the steel pipe body at the spigot, allowing air to enter the pipeline and form air bubbles. These air bubbles play a buffering role when the fluid flows, effectively reducing the impact of pipeline vibration on the fluid, thereby reducing fluid pressure fluctuations. At the same time, the air guide hole set at the spigot helps to regulate the speed at which air enters the pipeline, further stabilizing the fluid pressure. This solves the problem of fluid pressure fluctuations caused by the vibration generated by the pipeline being transmitted to the fluid inside the pipeline in the existing technology. Attached Figure Description

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is an enlarged view of the structure at point A of the present invention;

[0021] Figure 3 This is a side view of the air guide hole of the present invention;

[0022] Figure 4 This is a top view of the air guide hole of the present invention.

[0023] Explanation of key component symbols:

[0024] In the figure: 1. Steel pipe body; 2. Socket; 3. Spiral; 4. Elastic sealing part; 41. First spring; 42. Flexible sleeve; 5. Tamping part; 6. Rebound part; 61. Limiting block; 62. Second spring; 7. Air guide hole; 8. Connecting rod; 9. Flexible pad; 10. Air guide pipe. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0026] Please see Figure 1 - Figure 4 This embodiment provides a fully self-anchored flexible connection steel pipe, including several steel pipe bodies 1. The two ends of each steel pipe body 1 form a socket 2 and a spigot 3, respectively. The steel pipe bodies 1 are sequentially connected via the sockets 2 and spigots 3. It also includes an elastic sealing part 4 disposed on the spigot 3, a tamping part 5 connected to the elastic sealing part 4, and a rebound part 6. The elastic sealing part 4 is located between the inner wall of the socket 2 and the outer wall of the spigot 3. An air guide hole 7 is provided on the steel pipe body 1 at the spigot 3. The rebound part 6 is disposed on the inner wall of the steel pipe body 1 at the spigot 3. The tamping part 5 is driven to move elastically back and forth. The tamping part 5 passes through the air guide hole 7 and drives the rebound part 6 to intermittently seal against the inner wall of the steel pipe body 1 at the spigot 3, allowing air to enter the pipeline and form air bubbles. The air bubbles are used to buffer the pressure fluctuations generated during fluid flow. The setting of the elastic sealing part 4 ensures the tightness of the connection and prevents fluid leakage. Through the reciprocating motion of the elastic sealing part 4 and the intermittent contact of the tamping part 5, the impact of pipeline vibration on the fluid is effectively reduced. The formation of air bubbles can alleviate the pressure fluctuations generated during fluid flow and protect the pipeline and equipment.

[0027] One point to note is that the presence of air bubbles can buffer pressure fluctuations generated during fluid flow. When fluid flow is affected by pipe vibration, the bubbles can act as a "shock absorber," reducing drastic pressure changes. The injection of air can also change the flow characteristics of the fluid, reducing the impact force of the fluid on the pipe wall, thereby reducing fatigue damage to the pipe caused by the impact force.

[0028] Currently, fully self-anchored flexible connection steel pipes, as a high-strength and high-sealing pipeline connection technology, are commonly used in urban water supply, underground integrated pipe corridors, fire protection pipe networks, and long-distance water diversion projects. Its conventional structure includes a socket 2, a spigot 3, a sealing ring, a circular retaining ring with an opening, a hook, and a boss. Self-anchoring connection is achieved through the radial expansion and rebound deformation of the retaining ring. However, under special working conditions such as fire protection pipe network water transmission projects and oil and gas production areas where heavy-duty vehicles frequently pass, the existing technology has revealed significant defects: the dynamic load applied to the ground by frequently passing heavy-duty vehicles is transmitted to the buried pipeline through the soil medium, inducing high-frequency vibration of the pipeline. This vibration energy is coupled to the fluid medium through the pipe wall, triggering hydrodynamic effects—especially the water hammer effect generated by periodic pressure fluctuations. Long-term effects lead to fatigue damage to the pipeline material, ultimately causing interface sealing failure or pipe rupture accidents.

[0029] To address the aforementioned issues, in this embodiment, an elastic connection system is formed by providing an elastic sealing part 4, a tamping part 5, and a rebound part 6 between the steel pipe bodies 1. The elastic sealing part 4 drives the tamping part 5 to move elastically back and forth. The tamping part 5, passing through the air guide hole 7, drives the rebound part 6 to intermittently seal against the inner wall of the steel pipe body 1 at the spigot 3, allowing air to enter the pipe and form air bubbles. These air bubbles act as a buffer during fluid flow, effectively reducing the impact of pipe vibration on the fluid and thus reducing fluid pressure fluctuations. At the same time, the air guide hole 7 at the spigot 3 helps to regulate the speed at which air enters the pipe, further stabilizing the fluid pressure and solving the problem of fluid pressure fluctuations caused by the vibration generated by the pipe being transmitted to the fluid inside the pipe in the prior art.

[0030] To ensure that air can enter the pipe evenly, in one embodiment, there are several air guide holes 7, which are evenly distributed along the axial direction directly above the steel pipe body 1. On the one hand, the air guide holes 7 are arranged along the axial direction directly above the steel pipe body 1 so that the air guide holes 7 can cooperate with the tamping part 5. On the other hand, when the pipe is in use, the fluid is not always filling the pipe. Most of the time, the fluid will not fill the pipe and will flow. This design can largely prevent fluid overflow and allow air to enter better.

[0031] It is worth mentioning that the flow velocity in the pipeline varies under different conditions. In order to ensure that the air guide holes 7 designed on the pipeline can adapt to the bubble coverage requirements under different pipe diameters / flow velocities, in one embodiment, the formula n= L / λ D The +1 is used to determine the correspondence between the number of vent holes 7 (n) and the length L of the steel pipe body 1, where λ is the distribution coefficient of the vent holes 7 and D is the nominal diameter of the pipe. The distribution coefficient λ considers factors such as the main frequency range of heavy-duty vehicle vibration, the rising speed of bubbles, and the propagation speed of pressure waves to adjust the spacing of the vent holes 7 so that the bubble generation frequency can cover the main frequency band of vibration. By introducing a dimensionless coefficient λ, this formula is applicable to pipes of different specifications, avoiding absolute size limitations. Rounding ensures the minimum number of vent holes 7, while "+1" ensures coverage of the end area. The value of λ ranges from 0.8 to 1.2. When applied to flammable media, it is taken as 0.8-0.9 to enhance explosion-proof performance. When the medium viscosity is greater than 50 cP, it is taken as 1.1-1.2 to increase the spacing and avoid bubble aggregation. For example, for a pipe with a nominal diameter of 500 mm and a length of 12 m, when λ is 1.0, it is calculated that 25 vent holes 7 are needed, and the spacing of the vent holes 7 is 0.5 m, i.e., 1.0D. This arrangement allows the bubble injection frequency f to be related to the fluid velocity v and the distance Δs between the air guide holes 7 as f=v / Δs, thereby suppressing 1 / 4 wavelength resonance by adjusting the fluid velocity and the characteristic frequency of pipe vibration.

[0032] Because this project targets the special working conditions of high-frequency traffic of heavy-duty vehicles in fire-fighting pipeline water supply projects and oil and gas production areas, the high-frequency traffic of heavy-duty vehicles will generate enormous pressure and vibration on the ground under these conditions. To ensure a secure seal for the steel pipe body 1 at the socket 2 and spigot 3, and to fundamentally reduce the enormous pressure and vibration generated by heavy-duty vehicles on the ground, in one embodiment, the elastic sealing part 4 includes several first springs 41 and a flexible sleeve 42 fitted onto the outer wall of the spigot 3. The several first springs 41 are evenly arranged inside the flexible sleeve 42. The first spring 41 located on the axis directly above the steel pipe body 1 is connected to the tamping part 5. The first spring 41 and the tamping part 5 are connected by a connecting rod 8, which is perpendicular to both the first spring 41 and the tamping part 5. The tamping part 5 is connected to the end of the first spring 41 furthest from the spigot 3. Firstly, the several first springs 41 in the elastic sealing part 4 can absorb and alleviate the pressure and vibration caused by the traffic of heavy-duty vehicles. The generated vibration and impact force protect the steel pipe body 1. Secondly, when the first spring 41 is compressed, it stores energy in the form of elastic potential energy. When the spring is released, this stored energy is converted into kinetic energy, which makes the tamping part 5 connected to it obtain a larger movement speed and acceleration, thereby increasing the tamping. The first spring 41 is fixedly connected to the tamping part 5. The vibration frequency of the first spring 41 matches the natural frequency of the tamping part and resonance will also occur. In the resonance state, the vibration amplitude of the system will increase significantly because the resonance will make the energy input and output in each vibration cycle of the system reach a balance, resulting in the vibration amplitude amplification. This makes the tamping part 5 tamping a larger amplitude and makes it easier for air to enter the pipe body. The flexible sleeve 42 is fitted on the outer wall of the socket 3 and works together with the first spring 41. It can not only provide additional elastic buffer, but also ensure the stability of the connection and avoid loosening of the connection due to vibration.

[0033] Furthermore, to better facilitate the formation of air bubbles within the pipe, in one embodiment, the diameter of the tamping part 5 is greater than half the diameter of the air guide hole 7 but smaller than the diameter of the air guide hole 7. The tamping part 5 is a tamping rod. The purpose of the tamping part 5 is that, when subjected to vibration, it will open the rebound part 6 below the air guide hole 7, allowing air to enter the pipe and form air bubbles. However, considering that the tamping part 5 is located between the socket 2 and the spigot 3, and that there is an elastic sealing part 4 between the socket 2 and the spigot 3 for sealing, after prolonged use, the area between the socket and the spigot 3 will lack air, thus affecting the conditions for air bubble formation. To avoid this problem, the steel pipe body at the socket... The tamping rod is provided with a guide groove, through which it slides. The diameter of the guide groove is larger than that of the tamping rod to avoid friction between the guide groove and the tamping rod, thus reducing the range of motion of the tamping rod. In addition, it can also prevent the tamping rod from blocking the airflow. An air guide pipe 10 is provided on the guide groove, which is connected to the outside. However, if the pipe is buried underground, the air guide pipe 10 is flush with the ground and will not protrude from the ground to affect its use. In addition, a one-way air inlet valve is provided at the point where the air guide pipe 10 connects to the outside. The one-way air inlet valve can only allow outside air to enter and will not cause internal air to overflow. Furthermore, the air guide pipe 10 is arranged at a 30° angle to avoid siltation.

[0034] Following the above embodiments, in one embodiment, the rebound part 6 includes a limiting block 61 and a second spring 62. The two ends of the second spring 62 are respectively connected to the limiting block 61 and the inner wall of the steel pipe body 1 at the insertion port 3. The diameter of the limiting block 61 is larger than the diameter of the air guide hole 7. The first function of the limiting block 61's larger diameter than the air guide hole 7 is that when heavy-duty vehicles are not passing, the limiting block 61 can have a larger sealing contact surface with the air guide hole 7, keeping the pipe in a sealed state. When heavy-duty vehicles frequently pass, the limiting block 61 can also intermittently seal with the air guide hole 7. This intermittent sealing can... To reduce wear on the sealing surface and improve the system's durability and service life, a flexible pad 9 is provided between the limiting block 61 and the air guide hole 7. The limiting block 61 is cylindrical, and the contact area between the cylindrical limiting block 61 and the air guide hole 7 is larger. Combined with the use of the flexible pad 9, it can better fill the gap, improve the sealing effect, and ensure the sealing performance of the pipeline system when heavy vehicles pass through. Since the inner wall of the pipeline is curved, the flexible pad 9 can better adapt to the inner wall structure of the pipeline, resulting in a better sealing effect. In addition, the flexible pad 9 can also adapt to the small gaps or irregular shapes that may exist between the limiting block 61 and the air guide hole 7, improving the adaptability and reliability of the sealing system.

[0035] The working process and principle of this invention:

[0036] The fully self-anchored flexible connection steel pipe of the present invention uses a vibration energy-driven air injection mechanism to convert external vibration into bubble generation power, thereby solving the problem of fluid pressure fluctuation caused by pipeline vibration. Its working principle is as follows: When a heavy-duty vehicle passes over the ground, the dynamic load generated is transmitted to the pipeline through the soil, causing high-frequency vibration. The vibration energy is transmitted through the steel pipe body 1 to the elastic sealing part 4 at the spigot 3, driving the tamping part 5 rigidly connected to it to reciprocate along the direction of the air guide hole 7. Under the action of vibration, the tamping part 5 penetrates the air guide hole 7 and pushes the limiting block 61 of the rebound part 6 to disengage from the sealing surface. At this time, the outside air enters the pipeline through the air guide hole 7. When the vibration stops, the second spring 62 of the rebound part 6 pushes the limiting block 61 to reset and re-close the air guide hole 7. Through intermittent opening and closing, air is injected into the fluid in segments to form a dispersed bubble group. The compression and deformation of the bubbles consume the fluid kinetic energy. The presence of bubbles reduces the equivalent density of the fluid, reduces the pressure wave velocity, reduces the superposition of reflected waves, and the bubble disturbance destroys the laminar flow structure and increases turbulent dissipation.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A fully self-anchoring flexible connection steel pipe, comprising a plurality of steel pipe bodies, wherein both ends of the plurality of steel pipe bodies are respectively formed with a socket and a spigot, and the plurality of steel pipe bodies are sequentially connected by the socket and spigot fittings, characterized in that, It also includes an elastic sealing part disposed on the socket, a tamping part and a rebound part connected to the elastic sealing part. The elastic sealing part is located between the inner wall of the socket and the outer wall of the socket. An air guide hole is provided on the steel pipe body at the socket. The rebound part is disposed on the inner wall of the steel pipe body at the socket. The elastic sealing part drives the tamping part to move elastically back and forth. The tamping part passes through the air guide hole and drives the rebound part to intermittently seal and fit with the inner wall of the steel pipe body at the socket, so that air enters the pipeline and forms air bubbles. The air bubbles are used to buffer the pressure fluctuations generated during fluid flow.

2. The fully self-anchored flexible connection steel pipe according to claim 1, characterized in that, The number of air guide holes is several, and the air guide holes are evenly distributed along the axial direction directly above the steel pipe body.

3. The fully self-anchored flexible connection steel pipe according to claim 2, characterized in that, The relationship between the number of air guide holes n and the length L of the steel pipe body is: n = L / λ D +1, where λ is the air guide hole distribution coefficient and D is the nominal diameter of the pipe. This indicates the floor function.

4. The fully self-anchored flexible connection steel pipe according to claim 1, characterized in that, The elastic sealing part includes a plurality of first springs and a flexible sleeve sleeved on the outer wall of the socket, wherein the plurality of first springs are evenly arranged inside the flexible sleeve.

5. A fully self-anchored flexible connection steel pipe according to claim 4, characterized in that, The first spring, located on the axis directly above the steel pipe body, is connected to the tamping part, and the tamping part is connected to the end of the first spring away from the socket.

6. The fully self-anchored flexible connection steel pipe according to claim 1, characterized in that, The diameter of the tamping part is greater than half the diameter of the air guide hole but less than the diameter of the air guide hole.

7. The fully self-anchored flexible connection steel pipe according to claim 1, characterized in that, The rebound section includes a limiting block and a second spring, with the two ends of the second spring connected to the limiting block and the inner wall of the steel pipe body at the insertion port, respectively.

8. A fully self-anchored flexible connection steel pipe according to claim 7, characterized in that, A flexible pad is provided between the limiting block and the air guide hole. The limiting block is cylindrical and its diameter is larger than that of the air guide hole.

9. A fully self-anchored flexible connection steel pipe according to claim 1, characterized in that, The tamping part is a tamping rod, and a guide groove is provided on the steel pipe body at the socket. The tamping rod slides through the guide groove, and the diameter of the guide groove is larger than the diameter of the tamping rod.

10. A fully self-anchored flexible connection steel pipe according to claim 9, characterized in that, An air guide pipe is provided on the guide groove, and the air guide pipe is connected to the outside.

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