Full-self-anchoring flexible connecting steel pipe

Abstract

The invention relates to a full-self-anchoring flexible connecting steel pipe and belongs to the technical field of full-self-anchoring steel pipes. An elastic sealing part, a tamping part and a rebounding part are arranged between steel pipe bodies to form an elastic connecting system, and the elastic sealing part drives the tamping part to elastically move back and forth; the tamping part penetrates through the air guide hole to drive the rebound part to be intermittently and hermetically attached to the inner wall of the steel pipe body at the inserting opening, so that air enters a pipeline to form air bubbles, the air bubbles play a role in buffering when fluid flows, the influence of pipeline vibration on the fluid is effectively reduced, and therefore fluid pressure fluctuation is reduced; the air guide holes formed in the inserting opening are beneficial for adjusting the speed of air entering the pipeline, the fluid pressure is further stabilized, and the problem that in the prior art, vibration generated by the pipeline is transmitted to fluid in the pipeline, and consequently the fluid pressure fluctuates is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fully self-anchored steel pipes, and particularly relates to a fully self-anchored flexible connection steel pipe. Background Art

[0002] As a high-strength and high-sealing pipeline connection technology, the fully self-anchored flexible connection steel pipe is usually applied to urban water supply, underground utility tunnels, fire protection pipe networks and long-distance water diversion projects. Its conventional structure includes a socket, a spigot, a sealing rubber ring, a circular snap ring with an opening, a hook head and a boss, and realizes self-anchored connection through the radial expansion and rebound deformation of the snap ring.

[0003] However, in special working conditions such as fire protection pipe network water conveyance projects and oil and gas production areas where heavy vehicles pass frequently, the existing technology exposes significant defects: the dynamic loads exerted on the ground by frequently passing heavy vehicles are transmitted to the buried pipeline through the soil medium, inducing high-frequency vibration of the pipeline. The vibration energy is coupled and conducted through the pipe wall to the fluid medium, triggering hydrodynamic effects - especially the water hammer effect caused by periodic pressure fluctuations. Long-term action leads to fatigue damage of the pipeline material, and finally causes interface seal failure or pipe body rupture accidents. Although the self-anchoring mechanism of the existing structure can ensure static sealing, it lacks an active design for dissipating dynamic vibration energy, resulting in the fluid-structure coupling vibration problem becoming a technical bottleneck restricting the long-term reliability of the pipeline. Summary of the Invention

[0004] To solve the above problems existing in the prior art, the present invention provides a fully self-anchored flexible connection steel pipe, which solves the problem that the vibration generated in the pipeline in the prior art is transmitted to the fluid in the pipeline, resulting in fluid pressure fluctuations.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A fully self-anchored flexible connection steel pipe includes a plurality of steel pipe bodies. The two ends of each of the plurality of steel pipe bodies respectively form a socket and a spigot. The plurality of steel pipe bodies are sequentially connected through the cooperation of the socket and the spigot. It further includes an elastic sealing part arranged on the spigot, a vibrating part and a rebounding 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 spigot. An air guide hole is arranged on the steel pipe body at the spigot. The rebounding part is arranged on the inner wall of the steel pipe body at the spigot. The elastic sealing part drives the vibrating part to elastically move back and forth. The vibrating part penetrates through the air guide hole to drive the rebounding part to intermittently seal and fit with the inner wall of the steel pipe body at the spigot, so that air enters the pipeline to form air bubbles. The air bubbles are used to buffer the pressure fluctuations generated when the fluid flows.

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

[0008] As a further solution of the present invention, the corresponding relationship between the number n of the air guide holes and the length L of the steel pipe body is: where λ is the air guide hole distribution coefficient, and D is the nominal diameter of the pipeline. represents the floor function operation.

[0009] As a further solution 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, and the plurality of first springs are uniformly arranged in the flexible sleeve.

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

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

[0012] As a further solution of the present invention, the rebounding part includes a limiting block and a second spring, and the two ends of the second spring are respectively connected to the limiting block and the inner wall of the steel pipe body at the socket.

[0013] As a further solution of the present invention, a flexible pad is arranged between the limiting block and the air guide hole. The limiting block is cylindrical, and the diameter of the limiting block is greater than the diameter of the air guide hole.

[0014] As a further solution of the present invention, the ramming part is a ramming rod, and a guiding groove is arranged on the steel pipe body at the socket. The ramming rod slides through the guiding groove, and the diameter of the guiding groove is greater than the diameter of the ramming rod.

[0015] As a further solution of the present invention, an air guide pipe is arranged on the guiding groove, and the air guide pipe communicates with the outside.

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

[0017] By arranging an elastic sealing part, a ramming part and a rebounding part between the steel pipe bodies, an elastic connection system is formed. The elastic sealing part drives the ramming part to move elastically back and forth. The ramming part penetrates through the air guide hole to drive the rebounding part to intermittently seal and fit with the inner wall of the steel pipe body at the socket, so that air enters the pipeline to form air bubbles. These air bubbles play a buffering role when the fluid flows, effectively reducing the influence of pipeline vibration on the fluid, thereby reducing the fluid pressure fluctuation. At the same time, the air guide holes arranged at the socket help to adjust the speed of air entering the pipeline, further stabilizing the fluid pressure, and solving the problem that the vibration generated by the pipeline in the prior art is transmitted to the fluid in the pipeline, resulting in fluid pressure fluctuation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 is the overall structural schematic diagram of the present invention;

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

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

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

[0023] Description of main component symbols:

[0024] In the figure: 1, steel pipe body; 2, socket; 3, spigot; 4, elastic sealing part; 41, first spring; 42, flexible sleeve; 5, tamping part; 6, rebounding part; 61, limit block; 62, second spring; 7, air guide hole; 8, connecting rod; 9, flexible pad; 10, air duct. Specific embodiments

[0025] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific embodiments, structures, features and their effects of the present invention as follows.

[0026] Please refer to Figure 1 - Figure 4 , this embodiment provides a fully self-anchoring flexible connection steel pipe, which includes a plurality of steel pipe bodies 1. The two ends of the plurality of steel pipe bodies 1 respectively form sockets 2 and spigots 3. The plurality of steel pipe bodies 1 are sequentially connected through the cooperation of the sockets 2 and spigots 3. It further includes an elastic sealing part 4 arranged on the spigot 3, a tamping part 5 and a rebounding part 6 connected to the elastic sealing part 4. 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 arranged on the steel pipe body 1 at the spigot 3. The rebounding part 6 is arranged on the inner wall of the steel pipe body 1 at the spigot 3. The elastic sealing part 4 drives the tamping part 5 to elastically move back and forth. The tamping part 5 penetrates through the air guide hole 7 to drive the rebounding part 6 to intermittently seal and fit with the inner wall of the steel pipe body 1 at the spigot 3 so that air enters the pipeline to 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 back-and-forth movement of the elastic sealing part 4 and the intermittent fitting of the tamping part 5, the influence of pipeline vibration on the fluid is effectively reduced. The formation of air bubbles can relieve the pressure fluctuations generated during fluid flow and protect the pipeline and equipment.

[0027] It should be noted that the presence of air bubbles can buffer the pressure fluctuations generated during fluid flow. When the fluid flow is affected by pipeline vibration, the bubbles can act like a "shock absorber" to reduce the sharp changes in pressure. The injection of air can also change the flow characteristics of the fluid, reduce the impact force of the fluid on the pipeline wall, and thus reduce the fatigue damage of the pipeline caused by the impact force.

[0028] At present, the fully self-anchoring flexible connection steel pipe, as a high-strength and high-sealing pipeline connection technology, is usually applied to urban water supply, underground utility tunnels, fire protection pipe networks, and long-distance water diversion projects. Its conventional structure includes a socket 2, a spigot 3, a sealing rubber ring, a circular snap ring with an opening, a hook head, and a boss. The self-anchoring connection is achieved through the radial expansion and rebound deformation of the snap ring. In special working conditions such as fire protection pipe network water conveyance projects and oil and gas production areas where heavy vehicles pass frequently, the existing technology has shown significant defects: the dynamic loads exerted by the frequently passing heavy vehicles on the ground are transmitted to the buried pipeline through the soil medium, inducing high-frequency vibration of the pipeline. This vibration energy is coupled and conducted through the pipe wall to the fluid medium, triggering hydrodynamic effects - especially the water hammer effect caused by periodic pressure fluctuations. Long-term action leads to fatigue damage of the pipeline material, and ultimately causes interface seal failure or pipe body rupture accidents.

[0029] To solve the above problems, in this embodiment, an elastic connection system is formed by arranging an elastic sealing part 4, a vibrating part 5, and a rebounding part 6 between the steel pipe bodies 1. The elastic sealing part 4 drives the elastic reciprocating movement of the vibrating part 5. The vibrating part 5 penetrates through the air guide hole 7 to drive the rebounding part 6 to intermittently seal and fit with the inner wall of the steel pipe body 1 at the spigot 3, enabling air to enter the pipeline to form air bubbles. These air bubbles play a buffering role during fluid flow, effectively reducing the impact of pipeline vibration on the fluid, thereby reducing fluid pressure fluctuations. At the same time, the air guide hole 7 provided at the spigot 3 helps to regulate the speed of air entering the pipeline, further stabilizing the fluid pressure, and solving the problem in the existing technology that the vibration generated in the pipeline is transmitted to the fluid in the pipeline, resulting in fluid pressure fluctuations.

[0030] In order to enable air to enter the pipeline evenly, in one embodiment, the number of air guide holes 7 is several, and the air guide holes 7 are evenly distributed along the axis direction directly above the steel pipe body 1. On the one hand, the air guide holes 7 are arranged along the axis direction directly above the steel pipe body 1 to enable the air guide holes 7 to cooperate with the vibrating part 5. On the other hand, when the pipeline is in use, the fluid does not always fill the pipeline. Most of the time, the fluid does not flow while filling the pipeline. This design can largely prevent fluid overflow and better enable air to enter.

[0031] It is worth mentioning that the flow velocity of the pipeline is different under different conditions. In order to make the air guide holes 7 designed on the pipeline adapt to the bubble coverage requirements under different pipe diameters / flow velocities, in one embodiment, the formula is used to determine the corresponding relationship between the number n of the air guide holes 7 and the length L of the steel pipe body 1, where λ is the distribution coefficient of the air guide holes 7, and D is the nominal diameter of the pipeline. The distribution coefficient λ takes into account factors such as the main vibration frequency range of heavy-duty vehicles, the bubble rising speed, and the pressure wave propagation speed, etc., to adjust the spacing of the air guide holes 7 so that the bubble generation frequency can cover the main vibration frequency band. By introducing the dimensionless coefficient λ, this formula is applicable to pipelines of different specifications and avoids absolute size limitations. The rounding operation ensures the minimum number of air guide holes 7, and the "+1" ensures the coverage of the end area. The value range of λ is 0.8 - 1.2. When applied to combustible media, 0.8 - 0.9 is taken to enhance the explosion-proof performance. When the medium viscosity is greater than 50 cP, 1.1 - 1.2 is taken to increase the spacing to avoid bubble aggregation. For example, for a pipeline with a nominal diameter of 500 mm and a length of 12 m, when λ is taken as 1.0, it is calculated that 25 air guide holes 7 are required, and the spacing of the air guide holes 7 is 0.5 m, that is, 1.0D. Such an arrangement can make the relationship between the bubble injection frequency f, the fluid flow velocity v, and the spacing Δs of the air guide holes 7 be f = v / Δs, and further form a 1 / 4 wavelength resonance suppression by adjusting the fluid flow velocity and the pipeline vibration characteristic frequency.

[0032] Since it is aimed at the special working conditions of heavy-duty vehicle high-frequency passing in fire-fighting pipe network water conveyance projects, oil and gas production areas, etc., under such special working conditions, the high-frequency passing of heavy-duty vehicles will generate huge pressure and vibration on the ground. In order to ensure that the steel pipe body 1 at the socket 2 and spigot 3 can be firmly sealed and, at the same time, fundamentally reduce the huge pressure and vibration generated by heavy-duty vehicles on the ground. For this purpose, in one embodiment, the elastic sealing part 4 includes a number of first springs 41 and a flexible sleeve 42 sleeved on the outer wall of the spigot 3. The number of first springs 41 are evenly arranged in the flexible sleeve 42. The first spring 41 located at 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. The connecting rod 8 is perpendicular to the first spring 41 and the tamping part 5 respectively, and the tamping part 5 is connected to the end of the first spring 41 away from the spigot 3. First of all, the number of first springs 41 in the elastic sealing part 4 can absorb and relieve the vibration and impact force generated by the passing of heavy-duty vehicles, protecting the steel pipe body 1. Secondly, when the first spring 41 is compressed, it stores energy, which exists in the form of elastic potential energy. When the spring is released, this stored energy is converted into kinetic energy, enabling the connected tamping part 5 to obtain a relatively large moving speed and acceleration, thereby increasing the tamping. Moreover, since the first spring 41 is fixedly connected to the tamping part 5 and the vibration frequency of the first spring 41 matches the natural frequency of the tamping part, resonance will also occur. In the resonance state, the vibration amplitude of the system will increase significantly because resonance makes the input and output of energy in each vibration cycle of the system reach balance, resulting in the amplification of the vibration amplitude, so that the tamping amplitude of the tamping part 5 is larger and it is easier for air to enter the pipe body. The flexible sleeve 42 is sleeved on the outer wall of the spigot 3 and works together with the first spring 41, which can not only provide additional elastic buffering but also ensure the stability of the connection part, avoiding connection loosening caused by vibration.

[0033] Furthermore, in order to better allow air to enter the pipeline to form air bubbles, in one embodiment, the diameter of the vibrating part 5 is greater than half of the diameter of the air guide hole 7 and less than the diameter of the air guide hole 7. The vibrating part 5 is a vibrating rod. The purpose of designing the vibrating part 5 is that when it is vibrated, the vibrating part 5 will open the rebounding part 6 below the air guide hole 7, allowing air to enter the pipeline to form air bubbles. However, considering that the vibrating part 5 is the part between the socket 2 and the spigot 3, and there is an elastic sealing part 4 for sealing between the socket 2 and the spigot 3. After long-term use, there is no air in the part between the socket and the spigot 3, and the conditions for forming air bubbles are affected at this time. To avoid this problem, a guiding groove is provided on the steel pipe body 1 at the socket. The vibrating rod slides through the guiding groove, and the diameter of the guiding groove is greater than the diameter of the vibrating rod, which can avoid friction between the guiding groove and the vibrating rod, thereby reducing the movement amplitude of the vibrating rod. In addition, it can also prevent the vibrating rod from blocking the air flow. A gas guide pipe 10 is provided on the guiding groove, and the gas guide pipe 10 communicates with the outside. This gas guide pipe 10 communicates with the outside. However, if the pipeline is buried underground, then the gas guide pipe 10 is only flush with the ground and will not protrude above the ground to affect the use. In addition, a one-way intake valve is provided at the connection between the gas guide pipe 10 and the outside. The one-way intake valve can only allow outside air to enter and will not cause internal air to overflow. In addition, the gas guide pipe 10 is arranged at an angle of 30°, avoiding sediment deposition.

[0034] Continuing with the above embodiment, in one embodiment, the rebounding 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 spigot 3, and the diameter of the limiting block 61 is greater than the diameter of the air guide hole 7. The first function of the diameter of the limiting block 61 being greater than the diameter of the air guide hole 7 is that when heavy-duty vehicles do not pass, the limiting block 61 can have a larger sealing contact surface with the air guide hole 7, making the pipeline in a sealed state. When heavy-duty vehicles pass frequently, the limiting block 61 can also intermittently seal with the air guide hole 7. The limiting block 61 can intermittently maintain a sealed state with the air guide hole 7. This intermittent sealing can reduce the wear of the sealing surface, improve the durability and service life of the system. In addition, 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. Combining the use of the flexible pad 9 can better fill the gap, improve the sealing effect, and ensure the sealing performance of the pipeline system when heavy-duty vehicles pass. Since the inner wall of the pipeline is arc-shaped, the flexible pad 9 can better adapt to the inner wall structure of the pipeline, resulting in a good sealing effect. And the flexible pad 9 can also adapt to the possible small gaps or irregular shapes 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 the present 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 fluctuations caused by pipeline vibration. Its working principle is as follows: When a heavy 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 socket 3, driving the tamping part 5 rigidly connected to it to reciprocate along the direction of the air guide hole 7. The tamping part 5 penetrates the air guide hole 7 under the action of vibration, pushing the limit block 61 of the spring-back part 6 away from the sealing surface. At this time, external air enters the pipeline through the air guide hole 7. When the vibration stops, the second spring 62 of the spring-back part 6 pushes the limit block 61 to reset, closing the air guide hole 7 again. Through intermittent opening and closing, air is injected into the fluid in segments, forming a dispersed bubble group. The compression and deformation of the bubbles consume the kinetic energy of the fluid, the presence of the bubbles reduces the equivalent density of the fluid, causing the pressure wave speed to decrease and reducing the superposition of reflected waves. The bubble disturbance destroys the laminar flow structure and increases turbulent dissipation.

[0037] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A fully self-anchored flexible connecting steel pipe, comprising a plurality of steel pipe bodies, wherein the two 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 through the matching of the socket and the spigot, characterized in that: It also includes an elastic sealing part arranged on the socket, a pounding 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 arranged on the steel pipe body at the socket, the rebound part is arranged on the inner wall of the steel pipe body at the socket, the elastic sealing part drives the pounding part to elastically move back and forth, the pounding part penetrates the air guide hole to drive the rebound part to intermittently seal and fit with the inner wall of the steel pipe body at the socket to allow air to enter the pipeline to form air bubbles, and the air bubbles are used to buffer the pressure fluctuations generated when the fluid flows.

2. A fully self-anchored flexible connecting steel pipe according to claim 1, characterized in that: There are a plurality of air guide holes, and the air guide holes are evenly spaced and distributed along the axis direction directly above the steel pipe body.

3. The fully self-anchored flexible connecting steel pipe according to claim 2, characterized in that: The corresponding relationship between the number of air guide holes n and the length L of the steel pipe body is: Where λ is the distribution coefficient of air guide holes, D is the nominal diameter of the pipe, Indicates floor operation.

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

5. The fully self-anchored flexible connecting steel pipe according to claim 4, characterized in that: The first spring located at the axis just above the steel pipe body is connected to the pounding part, and the pounding part is connected to an end of the first spring away from the socket.

6. The fully self-anchored flexible connecting steel pipe according to claim 1, characterized in that: The diameter of the pounding portion is greater than half of the diameter of the air guide hole and smaller than the diameter of the air guide hole.

7. The fully self-anchored flexible connecting steel pipe according to claim 1, characterized in that: The rebound part includes a limit block and a second spring, and two ends of the second spring are respectively connected to the limit block and the inner wall of the steel pipe body at the socket.

8. The fully self-anchored flexible connecting steel pipe according to claim 7, characterized in that: A flexible pad is arranged between the limit block and the air guide hole. The limit block is cylindrical, and the diameter of the limit block is greater than the diameter of the air guide hole.

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

10. The fully self-anchored flexible connecting steel pipe according to claim 9, characterized in that: An air guide pipe is arranged on the guide groove, and the air guide pipe is communicated with the outside.

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