A pressure sealing device

Abstract

The utility model relates to the field of pipeline pressure plugging, specifically to a pressure plugging device, and its plugging head comprises: a connecting mechanism arranged at the moving end of a feeding mechanism; an oil cylinder rotatably arranged at the bottom of the connecting mechanism, the maximum turning angle of the oil cylinder being less than ninety degrees, the oil cylinder being in a horizontal state after maximum turning; a fixed connecting disc arranged on the oil cylinder, the telescopic rod of the oil cylinder passing through the fixed connecting disc; a movable connecting disc arranged at the end of the telescopic rod of the oil cylinder; and a plugging rubber pad arranged on the end face of the fixed connecting disc facing the movable connecting disc, the outer diameter of the plugging rubber pad in a natural state being less than the inner diameter of the pipeline. In the utility model, the outer diameter of the plugging rubber pad in a natural state is less than the inner diameter of the pipeline, so the plugging rubber pad can move smoothly in the pipeline without damaging the pipeline. After the plugging rubber pad is in place, the oil cylinder is retracted to squeeze the plugging rubber pad and complete effective plugging, and the plugging effect is better.

Description

Technical Field

[0001] This utility model relates to the field of live pipeline sealing, and in particular to a live sealing device. Background Technology

[0002] Live pipeline sealing devices isolate the section of the pipeline requiring maintenance through sealing elements, allowing various operations such as inspection or partial replacement to be performed without affecting the internal medium. This method avoids the cost and time losses associated with traditional downtime maintenance.

[0003] Chinese Patent CN104180122B discloses a plug-type sealing plug for pressurized oil and gas pipelines. The sealing plug has a support plate connected to the inner circumference of its fixed cylinder. The support plate has pins corresponding to the vertical cuts of the fixed cylinder. Two rocker arms are symmetrically connected to the two ends of the pins through end shaft holes. Each rocker arm's tail end is connected to a circular plate fitted with a rubber sealing ring. The circular plate is connected to a circular pressure plate that presses the rubber sealing ring, and the circular pressure plate is connected to a vertical guide plate equipped with large and small guide wheels. Based on the radial piston sealing principle, this sealing plug presses the interference-fit rubber sealing ring into a pressurized oil and gas pipeline with a pressure of 10 MPa or higher, effectively sealing the pipeline. This avoids the complex operations and high costs associated with pipeline pressure reduction and shut-off, achieving safe temporary interruption without interrupting pipeline flow, and providing a useful means for emergency pipeline modification and renovation.

[0004] However, the above-mentioned publicly available solutions have the following shortcomings: the rubber sealing ring and the pipe are too tightly fitted, making it difficult for the sealing head to move freely in and out of the pipe. During the sealing process, it is easy to cause incomplete sealing or even breakage of the pipe. Utility Model Content

[0005] The purpose of this invention is to address the problem in the prior art where the interference fit between the rubber sealing ring and the pipe easily leads to incomplete sealing or even pipe rupture during the sealing process. This invention proposes a pressurized sealing device.

[0006] The technical solution of this utility model is as follows: A pressurized plugging device includes a pipeline and a feeding mechanism installed on the pipeline. An operating hole is provided on the pipeline, and a plugging head is installed at the bottom of the feeding mechanism. The plugging head passes through the operating hole and then flips to plug the pipeline. The plugging head includes:

[0007] The connecting mechanism is located at the moving end of the feed mechanism;

[0008] The hydraulic cylinder is rotatably located at the bottom of the connecting mechanism. The maximum tilting angle of the hydraulic cylinder is less than 90 degrees, and the hydraulic cylinder is horizontal after tilting to its maximum angle.

[0009] A fixed connecting plate is mounted on the hydraulic cylinder, and the extension rod of the hydraulic cylinder passes through the fixed connecting plate;

[0010] A movable connecting plate is located at the end of the hydraulic cylinder telescopic rod;

[0011] And a sealing gasket is placed on the end face of the fixed connecting plate facing the movable connecting plate. In its natural state, the outer diameter of the sealing gasket is smaller than the inner diameter of the pipe. After the oil cylinder contracts, the sealing gasket is squeezed by the movable connecting plate to make it stick tightly to the inner wall of the pipe to achieve sealing.

[0012] Preferably, the feeding mechanism includes a mounting assembly disposed on the pipeline and a feeding component disposed on the mounting assembly.

[0013] Preferably, the installation assembly includes a gate valve saddle mounted on the pipeline, a gate valve mounted on the gate valve saddle, and a plugging box mounted on the gate valve.

[0014] Preferably, the cylinder is equipped with a cylinder nozzle, the sealing box is equipped with an oil pipe, and the oil pipe and the cylinder nozzle are connected by a flexible hose.

[0015] Preferably, the feeding assembly includes a main unit mounted on the sealing box, a feed screw rotatably mounted on the main unit, and a spindle slidably mounted in the main unit in a vertical direction. The bottom of the spindle is connected to the sealing head, and the spindle is provided with a threaded hole that mates with the feed screw.

[0016] Preferably, a spindle movement limiting sleeve is provided at the bottom of the main unit. The inner hole of the spindle movement limiting sleeve is non-circular, and the cross-sectional shape of one section of the spindle matches the shape of the inner hole of the spindle movement limiting sleeve.

[0017] Preferably, the connecting mechanism includes a main board, protective plates on both sides of the main board, and a connecting sleeve on the main board. The connecting sleeve is connected to the moving end of the feeding mechanism, the end of the hydraulic cylinder is rotatably connected to the bottom of the main board, the bottom of the main board is a main board limiting sidewall, a stop is provided on the right side of the bottom of the main board limiting sidewall, the hydraulic cylinder is attached to the main board limiting sidewall after flipping to the maximum angle, and the hydraulic cylinder is blocked by the stop after flipping to the maximum angle in the opposite direction.

[0018] Preferably, a guide wheel arm is provided on the end face of the movable connecting plate facing away from the fixed connecting plate, and a guide wheel is rotatably mounted on the guide wheel arm.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects: Since the outer diameter of the sealing gasket in its natural state is smaller than the inner diameter of the pipe, the sealing gasket can move smoothly inside the pipe without damaging or breaking it. After the sealing gasket is in place, the sealing gasket is squeezed by the contraction of the hydraulic cylinder to complete the effective sealing. Moreover, the squeezing of the sealing gasket is more adaptable to the uneven inner wall of the pipe, resulting in a better sealing effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0021] Figure 2This is a schematic diagram of the gate valve pipe saddle.

[0022] Figure 3 A schematic diagram of the main spindle movement limit sleeve;

[0023] Figure 4 This is a schematic diagram of the sealing box.

[0024] Figure 5 A structural schematic diagram of the main spindle and connecting sleeve;

[0025] Figure 6 This is a schematic diagram of the sealing head in its sealed state;

[0026] Figure 7 This is a schematic diagram of the sealing head in its unsealed state;

[0027] Figure 8 This is a structural diagram of the motherboard and the protective plate.

[0028] Reference numerals: 1. Pipeline; 2. Gate valve saddle; 3. Gate valve; 4. Sealing box; 5. Connecting sleeve; 6. Main unit; 7. Feed screw; 8. Spindle; 9. Bearing; 10. Spindle movement limit sleeve; 11. Threaded hole; 12. Main board; 13. Stop block; 14. Positioning socket; 15. Protective plate; 16. Insertion block; 17. Hydraulic cylinder; 18. Fixed connecting plate; 19. Movable connecting plate; 20. Sealing gasket; 21. Main board limit sidewall; 22. Guide wheel arm; 23. Guide wheel; 24. Connecting rod; 25. Hydraulic cylinder nozzle; 26. Oil pipe; 27. Connecting hole. Detailed Implementation

[0029] Example 1

[0030] like Figures 1-6 As shown, this utility model proposes a pressurized plugging device, including a pipe 1 and a feeding mechanism disposed on the pipe 1. The pipe 1 has an operating hole, and a plugging head is disposed at the bottom of the feeding mechanism. The plugging head passes through the operating hole and then flips to plug the pipe 1. The plugging head includes:

[0031] The connecting mechanism is located at the moving end of the feed mechanism;

[0032] The hydraulic cylinder 17 is rotatably mounted at the bottom of the connecting mechanism. The maximum tilting angle of the hydraulic cylinder 17 is less than 90 degrees. After the hydraulic cylinder 17 tilts to its maximum angle, it is horizontal.

[0033] A fixed connecting plate 18 is mounted on the hydraulic cylinder 17, and the telescopic rod of the hydraulic cylinder 17 passes through the fixed connecting plate 18.

[0034] The movable connecting plate 19 is set at the end of the telescopic rod of the hydraulic cylinder 17; the end face of the movable connecting plate 19 facing away from the fixed connecting plate 18 is provided with a guide wheel arm 22, and a guide wheel 23 is rotatably set on the guide wheel arm 22. The guide wheel 23 first contacts the inner wall of the bottom of the pipe 1, and then moves with small resistance and drives the hydraulic cylinder 17 to flip, so that the hydraulic cylinder 17 can smoothly enter the horizontal state.

[0035] And the sealing gasket 20 is set on the end face of the fixed connecting plate 18 facing the movable connecting plate 19. In its natural state, the outer diameter of the sealing gasket 20 is smaller than the inner diameter of the pipe 1. After the oil cylinder 17 retracts, it squeezes the sealing gasket 20 through the movable connecting plate 19 to make it stick tightly to the inner wall of the pipe 1 to achieve sealing. Specifically, in its natural state, the outer diameter of the sealing gasket 20 is three centimeters smaller than the inner diameter of the pipe 1, and it can freely enter and exit the pipe.

[0036] Example 2

[0037] like Figure 1 , Figure 6 and Figure 7 As shown, this utility model proposes a pressurized sealing device. Compared with Embodiment 1, this embodiment details the structure of the feeding mechanism.

[0038] The feeding mechanism includes a mounting assembly installed on pipe 1 and a feeding component installed on the mounting assembly.

[0039] The mounting components include a gate valve saddle 2 mounted on pipe 1, a gate valve 3 mounted on the gate valve saddle 2, and a plugging box 4 mounted on the gate valve 3. In an optional embodiment, the gate valve saddle 2 and the gate valve 3 are connected by a flange, and the gate valve 3 and the plugging box 4 are also connected by a flange. A cylinder nozzle 25 is mounted on the cylinder 17, and an oil pipe 26 is mounted on the plugging box 4. An adapter is connected to the front end of the oil pipe, located on the outer arm hole of the pipe. The oil pipe 26 and the cylinder nozzle 25 are connected to the inner end of the adapter via a corrugated hose, providing elasticity when the plugging head advances. An external oil pipe is connected to the oil pipe 26 to a hydraulic device to actuate the extension and retraction of the cylinder 17. The oil pipe 26 and the hose, as well as the cylinder nozzle 25 and the hose, are connected via adapters, which are conventional threaded connections.

[0040] The feeding assembly includes a main unit 6 mounted on the sealing box 4, a feed screw 7 rotatably mounted on the main unit 6, and a main shaft 8 slidably mounted vertically within the main unit 6. The bottom of the main shaft 8 is connected to the sealing head, and the main shaft 8 has a threaded hole 11 that mates with the feed screw 7. Specifically, the main unit 6 is cylindrical, and its bottom is connected to the sealing box 4 via a flange. The feed screw 7 passes through the top of the main unit 6, and the two are sealed and rotatably connected by two bearings 9. The outer end of the feed screw 7 is connected to a power mechanism, such as an output mechanism consisting of a motor and a reducer, which drives the feed screw 7 to rotate. The bottom part of the feed screw 7 is inserted into the threaded hole 11, and the rotation of the feed screw 7 drives the main shaft 8 to move upward or downward. A spindle movement limiting sleeve 10 is provided at the bottom of the main unit 6. The inner hole of the spindle movement limiting sleeve 10 is not circular. The cross-sectional shape of one section of the spindle 8 matches the inner hole shape of the spindle movement limiting sleeve 10, so that the spindle 8 can move up and down without rotating with the feed screw 7. In this embodiment, the inner hole shape of the spindle movement limiting sleeve 10 is a circle with a notch.

[0041] Example 3

[0042] like Figures 6-8 As shown, the present invention proposes a pressurized sealing device. Compared with Embodiment 1 or Embodiment 2, this embodiment details the structure of the connecting mechanism.

[0043] The connecting mechanism includes a main board 12, protective plates 15 on both sides of the main board 12, and a connecting sleeve 5 on the main board 12. The connecting sleeve 5 is connected to the moving end of the feed mechanism, i.e., connected to the bottom of the spindle 8. The end of the hydraulic cylinder 17 is rotatably connected to the bottom of the main board 12. The bottom of the main board 12 is a main board limiting sidewall 21. A stop block 13 is provided on the right side of the bottom of the main board limiting sidewall. Specifically, a connecting rod 24 is provided at the end of the hydraulic cylinder 17, a connecting hole 27 is provided on the stop block 13, and a rotating shaft is provided on the connecting rod 24, which fits into the connecting hole 27. Rotating, the hydraulic cylinder 17 flips to its maximum angle and then attaches to the limiting side wall 21 of the main board. After the hydraulic cylinder 17 flips to its maximum angle in the opposite direction, it is blocked by the stop block 13. In an optional embodiment, the main board 12 is provided with four positioning holes 14, and each of the two protective plates 15 is provided with two plug-in blocks 16. The plug-in blocks 16 are inserted into the positioning holes 14, and then the protective plates 15 and the main board 12 are welded and fixed. The main board 12 and the two protective plates 15 form a cross-shaped structure, and the main board 12 and the two protective plates 15 are used to guide the movement within the sealing box 4.

[0044] In summary, in this invention, when the main shaft 8 moves forward, the connecting sleeve 5 pushes the entire sealing head forward. The guide wheel 23 first contacts the inner wall of the bottom of the pipe 1, and the hydraulic cylinder 17 gradually rotates. Finally, the hydraulic cylinder 17 rotates to a horizontal state and contacts the main board's limiting side wall 21. At this time, the sealing pad 20 is in a vertical state, and its axis coincides with the axis of the pipe 1. Then, the extension rod of the hydraulic cylinder 17 retracts, and the movable connecting plate 19 squeezes the sealing pad 20, causing it to expand outward and tightly adhere to the inner wall of the pipe 1 to complete the sealing. Since the outer diameter of the sealing pad 20 in its natural state is smaller than the inner diameter of the pipe 1, the sealing pad 20 can move smoothly inside the pipe 1 without damaging or breaking it. After the sealing pad 20 is in place, the retraction of the hydraulic cylinder 17 squeezes the sealing pad 20 outward to complete the effective sealing. Moreover, the squeezing of the sealing pad 20 is more adaptable to the uneven inner wall of the pipe 1, resulting in a better sealing effect.

[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A pressurized plugging device, comprising a pipe (1) and a feeding mechanism disposed on the pipe (1), wherein the pipe (1) is provided with an operating hole, and a plugging head is disposed at the bottom of the feeding mechanism, the plugging head passing through the operating hole and then flipping over to plug the pipe (1); characterized in that, The plugging head includes: The connecting mechanism is located at the moving end of the feed mechanism; The hydraulic cylinder (17) is rotatably located at the bottom of the connecting mechanism. The maximum tilting angle of the hydraulic cylinder (17) is less than 90 degrees. After the hydraulic cylinder (17) tilts to the maximum angle, it is horizontal. A fixed connecting plate (18) is set on the hydraulic cylinder (17), and the telescopic rod of the hydraulic cylinder (17) passes through the fixed connecting plate (18); The movable connecting plate (19) is located at the end of the telescopic rod of the hydraulic cylinder (17); And a sealing gasket (20) is set on the end face of the fixed connecting plate (18) facing the movable connecting plate (19). In its natural state, the outer diameter of the sealing gasket (20) is smaller than the inner diameter of the pipe (1). After the oil cylinder (17) contracts, it squeezes the sealing gasket (20) through the movable connecting plate (19) to make it stick tightly to the inner wall of the pipe (1) to achieve sealing.

2. The pressurized sealing device according to claim 1, characterized in that, The feeding mechanism includes a mounting assembly disposed on the pipe (1) and a feeding assembly disposed on the mounting assembly.

3. The pressurized sealing device according to claim 2, characterized in that, The installation components include a gate valve saddle (2) installed on the pipe (1), a gate valve (3) installed on the gate valve saddle (2), and a plug box (4) installed on the gate valve (3).

4. The pressurized sealing device according to claim 3, characterized in that, A cylinder nozzle (25) is provided on the cylinder (17), and an oil pipe (26) is provided on the sealing box (4). The oil pipe (26) and the cylinder nozzle (25) are connected by a hose.

5. The pressurized sealing device according to claim 3, characterized in that, The feeding assembly includes a main unit (6) mounted on the sealing box (4), a feed screw (7) rotatably mounted on the main unit (6), and a spindle (8) slidably mounted in the main unit (6) in the vertical direction. The bottom of the spindle (8) is connected to the sealing head, and the spindle (8) is provided with a threaded hole (11) that mates with the feed screw (7).

6. The pressurized sealing device according to claim 5, characterized in that, A spindle movement limiting sleeve (10) is provided at the bottom of the main unit (6). The inner hole of the spindle movement limiting sleeve (10) is non-circular. The cross-sectional shape of one section of the spindle (8) matches the inner hole shape of the spindle movement limiting sleeve (10).

7. The pressurized sealing device according to claim 1, characterized in that, The connecting mechanism includes a main board (12), guard plates (15) on both sides of the main board (12), and a connecting sleeve (5) on the main board (12). The connecting sleeve (5) is connected to the moving end of the feeding mechanism. The end of the cylinder (17) is rotatably connected to the bottom of the main board (12). The bottom of the main board (12) is a main board limiting sidewall (21). A stop block (13) is set on the right side of the bottom of the main board limiting sidewall. After the cylinder (17) is flipped to the maximum angle, it sticks to the main board limiting sidewall (21). After the cylinder (17) is flipped to the maximum angle in the opposite direction, it is blocked by the stop block (13).

8. The pressurized sealing device according to claim 1, characterized in that, A guide wheel arm (22) is provided on the end face of the movable connecting plate (19) facing away from the fixed connecting plate (18), and a guide wheel (23) is rotatably provided on the guide wheel arm (22).

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