Vibration-resistant high-pressure movable joint

Abstract

The utility model relates to an anti-vibration high-pressure movable joint which comprises a conical surface threaded pipe, an anti-vibration gland joint, an elastic sleeve and a locking nut. The anti-vibration high-pressure pipeline movable joint can be matched with a high-pressure stop valve and other connecting valves to be connected to a high-pressure conveying pipeline, the pressure bearing capacity is high, the anti-vibration effect is good, welding is not needed when the movable joint is connected with the connecting valves, the sealing effect is good, and the potential leakage risk can be reduced.

Description

Technical Field

[0001] The utility model relates to an anti-vibration high-pressure union joint. Background Art

[0002] Natural gas is likely to form hydrates during the processes of exploitation and transportation. In order to prevent the formation of hydrates from blocking pipelines, a hydrate inhibitor is usually injected into the wellhead temperature and pressure measuring sleeve through a high-pressure injection skid. At the same time, the agent also needs to be injected into the annulus to isolate substances such as hydrogen sulfide from contacting the casing, so as to slow down the corrosion of the casing wall. The existing injection pipelines use ordinary globe valves, welded unions and carbon steel pipes for welding and threaded connections.

[0003] The existing injection pipelines have the following problems in the actual production site:

[0004] I. Pressure pulse vibration and motor vibration are likely to cause the connection threads between the globe valve and the union joint to become loose and leak: The wellhead pressure of natural gas production wells is high, and some can reach 70 MPa. In order to ensure that the agent can be normally injected into the pipeline, the pressure of the injection skid for transporting the agent must be higher than the natural gas transportation pressure. The pressure pulse vibration of the agent combined with the vibration of the skid-mounted motor is extremely likely to cause the threads at the connection of the union joint and the globe valve to become loose and leak. The leakage reduces the transportation pressure of the skid-mounted device and makes it impossible to inject the agent into the temperature and pressure measuring sleeve and the annulus, resulting in waste of the agent. Without the long-term transportation of the agent, hydrates will form in the pipeline to block the transportation of natural gas. At the same time, without the inhibitor in the annulus to isolate harmful substances such as hydrogen sulfide, the corrosion of the casing will be accelerated, posing a safety hazard to the gas well.

[0005] II. There are many welding points on the pipeline, and each welding point needs to be inspected by flaw detection, with potential safety hazards of missed inspection and misjudgment: The existing agent injection pipelines generally use welded connections, with many welding points. Due to the high pressure of agent transportation, some pressures even reach 70 MPa. When the welding is not firm and there are fine cracks in the weld that are not detected, under the long-term high pressure and vibration, the welding position is likely to fall off and the fine cracks will become larger and leak, making it impossible for the skid-mounted device to inject the agent into the pipeline and the annulus, posing a safety hazard to the gas well. Summary of the Invention

[0006] The utility model provides an anti-vibration high-pressure union joint. This anti-vibration high-pressure pipeline union joint can be connected with a connecting valve such as a high-pressure globe valve on a high-pressure transmission pipeline. It not only has high pressure-bearing capacity and good anti-vibration effect, but also does not require welding for connection with the connecting valve, has good sealing effect, and can reduce the potential leakage risk.

[0007] The utility model is realized through the following solutions

[0008] Solution 1)

[0009] The anti-vibration high-pressure union of the utility model includes a tapered-thread pipe, an anti-seismic gland joint, an elastic sleeve, and a lock nut;

[0010] The tapered-thread pipe includes a hollow pipe body with a hole channel axially communicating to both ends inside the body. At least one axial end of the pipe body is provided with a tapered joint portion for sealingly mating with a tapered sealing hole of a connecting valve. The outer diameter of the tapered joint portion gradually increases during the process of extending from its outer end face to the other end of the pipe body;

[0011] The anti-seismic gland joint body is provided with a pipe body connection hole that movably sleeves on the outer periphery of the pipe body of the tapered-thread pipe; The outer peripheral walls at both axial ends of the anti-seismic gland joint are respectively provided with a first external thread and a second external thread. The second external thread is used for threaded connection with a valve body threaded connection hole provided at the outer end of the tapered sealing hole of the connecting valve;

[0012] The elastic sleeve movably sleeves on the outer periphery of the pipe body and one end abuts against the other axial end of the anti-seismic gland joint away from the tapered joint portion. A notch is provided on the wall body of the elastic sleeve, which penetrates the inner and outer surfaces of the elastic sleeve wall body and extends to both axial ends along the axial direction;

[0013] One axial end of the lock nut is provided with a nut internal thread hole locked on the first external thread. The other axial end of the lock nut is provided with a pressing collar with an inner diameter smaller than the nut internal thread hole. The inner wall of the pressing collar is provided with a pressing surface whose inner diameter gradually increases during the process of extending from the outer end face to the nut internal thread hole. The end of the anti-seismic gland joint for abutting against the elastic sleeve is provided with a pressing surface whose inner diameter gradually decreases during the process of extending from this side end face to the other side. When the lock nut is screwed tightly with the first external thread of the anti-seismic gland joint, the pressing surfaces of the pressing collar of the lock nut and the pressing surface of the anti-seismic gland joint respectively press against both axial ends of the elastic sleeve and cause the elastic sleeve to contract and tightly hold the pipe body.

[0014] The principle of this solution is: The elastic sleeve is made of elastic material and its elasticity is enhanced after heat treatment. When the lock nut is tightened, the elastic sleeve is extruded by the rear-end tapered surface and is tightly held and locked on the pipe body under the double extrusion of the anti-vibration gland head. In this way, the pipe body cannot rotate or loosen under vibration conditions. The entire structure plays a role in anti-vibration and anti-pulse.

[0015] Further, the axial ends of the elastic sleeve are provided with a first tapered surface and a second tapered surface whose outer diameters gradually increase during the process of extending from the corresponding end face to the other end. The pressing surface of the pressing collar for pressing the first tapered surface is consistent with the inclination direction and angle of the first tapered surface; The pressing surface of the anti-seismic gland joint for pressing the second tapered surface is consistent with the inclination direction and angle of the second tapered surface.

[0016] Further, the included angle between the conical surface of the conical joint part and its central axis is 58 - 59°, and the included angle between the conical surface of the conical sealing hole of the connecting valve and the central axis of the conical sealing hole is 60 - 61°.

[0017] Further, the anti-vibration high-pressure quick connector further includes a bushing;

[0018] An external thread of the pipe body is also provided on the outer peripheral wall of the part of the pipe body close to the conical joint part. The bushing is threadedly connected to the outside of the external thread of the pipe body through an internal thread of the bushing provided in the body and axially communicating with both ends; one axial end of the pipe body connection hole is a bushing mounting hole with an increasing inner diameter for movably sleeving on the outer periphery of the bushing;

[0019] The thread directions of the first external thread and the second external thread are opposite to the thread direction of the external thread of the pipe body.

[0020] Principle of this solution: The threads of the bushing and the conical threaded joint are different from the helix directions of the threads on the anti-vibration gland. In this way, under the action of vibration or pulse, no matter which part becomes loose, it will be offset by the other part. The threads are one positive and one negative, playing an interlocking role;

[0021] Further, an inclined conical surface is provided on the connecting end wall of the bushing mounting hole and the pipe body connection hole. The inclined conical surface has a gradually decreasing inner diameter from the direction of the bushing mounting hole to the direction of the pipe body connection hole. An external conical surface matching the angle of the inclined conical surface is provided at the axial end of the bushing.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This anti-vibration high-pressure pipeline quick connector can be connected to a connecting valve such as a high-pressure stop valve on a high-pressure transmission pipeline. It not only has high pressure-bearing capacity and good anti-vibration effect, but also does not require welding for connection with the connecting valve, has good sealing effect, and can reduce the potential leakage risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present invention; DETAILED DESCRIPTION OF THE INVENTION Embodiment 1

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] As Figure 1 shown, the anti-vibration high-pressure union of this embodiment includes a tapered threaded pipe 1, an anti-seismic gland joint 3, an elastic sleeve 4, and a lock nut 5;

[0027] The tapered threaded pipe 1 includes a hollow pipe body 1-1 with a hole axially communicating through both ends. At least one axial end of the pipe body 1-1 is provided with a tapered joint portion 1-2 for sealingly mating with the tapered sealing hole 10-1 of the connecting valve 10. The outer diameter of the tapered joint portion 1-2 gradually increases during the process of extending from its outer end face to the other end of the pipe body 1-1;

[0028] The anti-seismic gland joint 3 is provided with a pipe body connection hole 3-4 that movably sleevs on the outer periphery of the pipe body 1-1 of the tapered threaded pipe 1; The outer peripheral walls at both axial ends of the anti-seismic gland joint 3 are respectively provided with a first external thread 3-1 and a second external thread 3-2. The second external thread 3-2 is used for threaded connection with the valve body threaded connection hole 10-2 provided at the outer end of the tapered sealing hole 10-1 of the connecting valve 10;

[0029] The elastic sleeve 4 movably sleevs on the outer periphery of the pipe body 1-1 and one end abuts against the other axial end of the anti-seismic gland joint 3 away from the tapered joint portion 1-2. A notch 4-1 that penetrates the inner and outer surfaces of the wall body of the elastic sleeve 4 and extends axially to both axial ends is provided on the wall body of the elastic sleeve 4;

[0030] One axial end of the lock nut 5 is provided with a nut internal thread hole for locking outside the first external thread 3-1. The other axial end of the lock nut 5 is provided with a pressing collar 5-1 with an inner diameter smaller than that of the nut internal thread hole. The inner wall of the pressing collar 5-1 is provided with a pressing surface whose inner diameter gradually increases during the process of extending from the outer end face towards the nut internal thread hole. The anti-vibration gland joint 3 is used to abut against the end of the elastic sleeve 4 and is provided with a pressing surface whose inner diameter gradually decreases during the process of extending from this side end face to the other side. When the lock nut 5 is screwed tightly with the first external thread 3-1 of the anti-vibration gland joint 3, the pressing surfaces of the pressing collar 5-1 of the lock nut 5 and the pressing surface of the anti-vibration gland joint 3 respectively press against the two axial ends of the elastic sleeve 4 and cause the elastic sleeve 4 to contract and tightly hold the pipe body 1-1.

[0031] The principle of this solution is: The elastic sleeve is made of elastic material and its elasticity is enhanced after heat treatment. When the lock nut is being tightened, the elastic sleeve is extruded by the rear-end conical surface. Under the double extrusion of the anti-vibration gland head, the elastic sleeve tightens and locks the pipe body. In this way, under vibration conditions, the pipe body cannot rotate or become loose. This enables the entire structure to play a role in anti-vibration and anti-pulse.

[0032] Both axial ends of the elastic sleeve 4 in this embodiment are provided with a first conical surface 4-2 and a second conical surface 4-3 whose outer diameters gradually increase during the process of extending from the corresponding end face to the other end. The pressing surface of the pressing collar 5-1 used to press the first conical surface 4-2 is consistent with the inclination direction and angle of the first conical surface 4-2; the pressing surface of the anti-vibration gland joint 3 used to press the second conical surface 4-3 is consistent with the inclination direction and angle of the second conical surface 4-3.

[0033] The included angle between the conical surface of the conical joint part 1-2 in this embodiment and its central axis is 58 - 59°, and in this embodiment it is 59°. The included angle between the conical surface of the conical sealing hole 10-1 of the connecting valve 10 and the central axis of the conical sealing hole 10-1 is 60 - 61°, and in this embodiment it is 60°.

[0034] The anti-vibration high-pressure quick connector in this embodiment further includes a bushing 2;

[0035] The outer peripheral wall of the pipe body 1-1 near the conical joint part 1-2 is further provided with a section of pipe external thread 1-3. The bushing 2 is threadedly connected outside the pipe external thread 1-3 through a bushing internal thread 2-1 provided in its body and axially communicating to both ends; One axial end of the pipe connection hole 3-4 is a bushing installation hole 3-3 with an increasing inner diameter for movably sleeving outside the bushing 2;

[0036] The thread directions of the first external thread 3-1 and the second external thread 3-2 are opposite to the thread direction of the pipe external thread 1-3.

[0037] Principle of this solution: The helical directions of the threads of the bushing and the tapered thread joint are different from those of the threads on the anti-vibration gland head. In this way, under the action of vibration or pulse, no matter which part becomes loose, it will be offset by the other part. The threads are in opposite directions, playing an interlocking role;

[0038] On the connecting end wall of the bushing mounting hole 3-3 and the pipe body connecting hole 3-4 in this embodiment, there is an inclined tapered surface 3-5. The inner diameter of the inclined tapered surface 3-5 gradually decreases from the bushing mounting hole 3-3 to the pipe body connecting hole 3-4. The axial end of the bushing 2 is provided with an outer conical surface 2-2 that matches the angle of the inclined tapered surface 3-5.

[0039] During installation, the lock nut 5, the elastic sleeve 4, the anti-vibration gland joint 3, and the bushing are sequentially installed outside the tapered thread pipe 1, and then the tapered joint part 1-2 of the tapered thread pipe 1 is aligned with the tapered sealing hole 10-1 for sealing and fitting installation.

[0040] The above-described embodiments only represent the implementation modes of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. Vibration-resistant high-pressure joint, characterized by: It comprises a conical threaded pipe (1), a seismic-resistant gland joint (3), an elastic sleeve (4), and a locking nut (5); The conical threaded pipe (1) comprises a hollow pipe body (1-1) provided with a hole connected to two ends along the axial direction, and at least one axial end of the pipe body (1-1) is provided with a conical joint part (1-2) for sealing with a conical sealing hole (10-1) of a connecting valve (10), and the outer diameter of the conical joint part (1-2) gradually increases during the process of extending from its outer end surface to the other end of the pipe body (1-1); The anti-seismic gland joint (3) is provided with a tube body connecting hole (3-4) movably sleeved on the outer periphery of the tube body (1-1) of the conical threaded tube (1); the outer peripheral walls at the axial ends of the anti-seismic gland joint (3) are respectively provided with a first external thread (3-1) and a second external thread (3-2), and the second external thread (3-2) is used for threaded connection with the valve body threaded connecting hole (10-2) provided at the outer end of the conical sealing hole (10-1) of the connecting valve (10); The elastic sleeve (4) is movably mounted on the outer periphery of the tube body (1-1) and one end of the elastic sleeve (4) is abutted against the other axial end of the anti-seismic gland joint (3) away from the conical joint portion (1-2). The wall of the elastic sleeve (4) is provided with a notch (4-1) that penetrates the inner and outer surfaces of the wall of the elastic sleeve (4) and extends in the axial direction to both axial ends. The locking nut (5) is provided with a nut internal thread hole locked outside the first external thread (3-1) at one axial end, and a pressing ring (5-1) with an inner diameter smaller than the nut internal thread hole is provided at the other axial end of the locking nut (5). The inner wall of the pressing ring (5-1) is provided with a pressing surface whose inner diameter gradually increases in the process of extending from the outer end surface to the nut internal thread hole. The end of the anti-seismic gland joint (3) used to resist the elastic sleeve (4) is provided with a pressing surface whose inner diameter gradually decreases in the process of extending from the side end surface to the other side. When the locking nut (5) and the first external thread (3-1) of the anti-seismic gland joint (3) are tightened, the pressing surface of the pressing ring (5-1) of the locking nut (5) and the pressing surface of the anti-seismic gland joint (3) respectively press the axial ends of the elastic sleeve (4) and cause the elastic sleeve (4) to shrink and hold the tube body (1-1).

2. The vibration-resistant high-pressure flexible joint according to claim 1, characterized in that: The elastic sleeve (4) is provided with a first conical surface (4-2) and a second conical surface (4-3) at both axial ends thereof, the outer diameters of which gradually increase in the process of extending from the corresponding end surface to the other end; the pressing surface of the pressing ring (5-1) used to press the first conical surface (4-2) is consistent with the inclination direction and angle of the first conical surface (4-2); the pressing surface of the seismic gland joint (3) used to press the second conical surface (4-3) is consistent with the inclination direction and angle of the second conical surface (4-3).

3. The vibration-resistant high-pressure flexible joint according to claim 1, characterized in that: The included angle between the conical surface of the conical joint part (1-2) and its central axis is 58-59°, and the included angle between the conical surface of the conical sealing hole (10-1) of the connecting valve (10) and the central axis of the conical sealing hole (10-1) is 60-61°.

4. The vibration-resistant high-pressure flexible joint according to claim 1, characterized in that: The vibration-resistant high-pressure flexible joint further comprises a bushing (2); The outer wall of the tube body (1-1) near the conical joint portion (1-2) is also provided with a tube body outer thread (1-3), and the bushing (2) is threadedly connected to the outer surface of the tube body outer thread (1-3) through a bushing inner thread (2-1) provided in the tube body and connected to both ends along the axial direction; one axial end of the tube body connecting hole (3-4) is a bushing mounting hole (3-3) with an enlarged inner diameter for movably sleeved on the outer circumference of the bushing (2); The thread directions of the first external thread (3-1) and the second external thread (3-2) are opposite to the thread direction of the external thread (1-3) of the pipe body.

5. The vibration-resistant high-pressure flexible joint according to claim 4, characterized in that: An inclined conical surface (3-5) is provided on the connecting end wall of the bushing mounting hole (3-3) and the pipe body connecting hole (3-4), and the inner diameter of the inclined conical surface (3-5) gradually decreases from the bushing mounting hole (3-3) to the pipe body connecting hole (3-4), and the axial end of the bushing (2) is provided with an outer conical surface (2-2) that matches the angle of the inclined conical surface (3-5).

Images