Active sealing plugging head

Abstract

An active sealing plugging head belongs to the field of oil and gas pipeline maintenance equipment. The driving bracket is connected with a matched plugging cylinder; the driving rotating support comprises a connecting frame and a disc fixedly connected with the connecting frame. A connecting frame on the driving rotating bracket is rotationally connected with the driving bracket through a movable shaft; a movable shaft gland is fixedly connected to the outer side of the connecting frame on the driving rotating bracket; a contact assembly is fixedly connected to a disc of the driving rotating support. The contact assembly is connected with a guide wheel through a guide wheel shaft; an annular groove is formed in the outer circle face of a rotating disc of the driving rotating support, and a plurality of communicating holes communicating with one another are formed in the inner wall of the annular groove. The outer side of the disc of the driving rotating support is fixedly connected with a sealing leather cup. During plugging in the technical field of maintenance and repair of long-distance oil and gas pipelines, even if the leather cup is within the original compression amount or under other complex working conditions, medium micro-seepage can be prevented through active sealing, and the safety of the whole plugging process is improved.

Description

Technical Field

[0001] The utility model relates to an active sealing plugging head, belonging to the field of oil and gas pipeline maintenance equipment. Background Art

[0002] Before performing operations such as repair, overhaul, and pipe replacement on oil and gas pipelines, it is necessary to first install a tee pipe fitting on the oil and gas pipeline, open the oil and gas pipeline in the flange of the tee pipe fitting, and seal the oil and gas pipeline at the opening to stop the transmission of the medium in the oil and gas pipeline. Then, corresponding operations are performed on the fault of the oil and gas pipeline.

[0003] Previous plugging mechanisms relied entirely on the interference fit between the pipe and the rubber cup after plugging. Although this method has been widely used in the field, it has also exposed many problems. When encountering complex pipeline conditions and high plugging pressure, micro-leakage may occur. The plugging effect is difficult to meet the increasingly demanding operational requirements. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned problems existing in the background technology and to provide an active sealing plug.

[0005] The utility model achieves the above-mentioned purpose by adopting the following technical solutions:

[0006] 1. The invention relates to an active sealing plugging head, comprising an active support, an active rotating support and an adjusting block; the active support is connected to a matching sealing cylinder; the active rotating support comprises a connecting frame and a disc fixedly connected to the connecting frame; the connecting frame on the active rotating support is rotatably connected to the active support via a movable shaft; a movable shaft pressure cover is fixedly connected to the outer side of the connecting frame on the active rotating support; a contact assembly is fixedly connected to the disc of the active rotating support; the adjusting block is fixedly connected to the active support and contacts the pipe wall after the hole is opened; a support block is fixedly connected to the bottom side of the active support; a guide wheel is connected to the contact assembly via a guide wheel shaft; an annular groove is provided on the outer circumferential surface of the rotating disk of the active rotating support, and a plurality of interconnected connecting holes are provided on the inner wall of the annular groove; the connecting holes are also connected to a rotating frame joint fixedly connected to the disc of the active rotating support; the rotating frame joint is connected to a hydraulic hose to form a hydraulic pipeline; a top column is provided at one end of the connecting hole close to the annular groove, which slides in cooperation with the connecting hole; an expansion block is fixedly connected to the top column; a sealing leather cup is fixedly connected to the outer side of the disc of the active rotating support.

[0007] Compared with the existing technology, the beneficial effect of the present invention is that in the field of long-distance oil and gas pipeline maintenance and repair technology, even if the leather cup is within the original compression volume or under other complex working conditions, micro-seepage of the medium occurs, this phenomenon can be prevented through active sealing, thereby improving the safety of the entire sealing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a three-dimensional structural diagram of an active sealing plug of the utility model;

[0009] Figure 2 This is a structural schematic diagram of an active rotating bracket of an active sealing plugging head of the utility model;

[0010] Figure 3 It is a partial cross-sectional view of an active rotating bracket of an active sealing plugging head of the utility model.

[0011] In the figure: 1. Active bracket; 2. Active rotating bracket; 3. Adjustment block; 4. Support block; 5. Contact assembly; 6. Movable shaft; 7. Movable shaft gland; 8. Guide wheel; 9. Guide wheel shaft; 10. Expansion block; 12. Rotating frame joint; 13. Hydraulic hose; 14. Sealing leather cup; 15. Top column. DETAILED DESCRIPTION

[0012] The technical solutions of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0013] Specific implementation method 1: Figure 1-3As shown, this embodiment records an active sealing plugging head, including an active bracket 1, an active rotating bracket 2 and an adjusting block 3; the active bracket 1 is connected to the matching sealing cylinder; the active rotating bracket 2 includes a connecting bracket and a disc fixedly connected to the connecting bracket; the connecting bracket on the active rotating bracket 2 is rotatably connected to the active bracket 1 through a movable shaft 6; the outer side of the connecting bracket on the active rotating bracket 2 is fixedly connected to a movable shaft pressure cover 7; the disc of the active rotating bracket 2 is fixedly connected to a contact assembly 5; the adjusting block 3 is connected to the active bracket 1 by screws, and contacts the pipe wall after the hole is opened, playing a lateral support role; the bottom side of the active bracket 1 is connected to a support block 4 by screws, and the support block 4 contacts the bottom of the pipe to play the role of main body support; the contact assembly 5 is connected to a guide wheel 8 through a guide wheel shaft 9, so that the sealing head can be smoothly Reach the target position; an annular groove is provided on the outer circumferential surface of the turntable of the active rotating bracket 2, and a plurality of interconnected connecting holes are provided on the inner wall of the annular groove; the connecting hole is also connected with the rotating bracket joint 12 fixedly connected to the disc of the active rotating bracket 2; the rotating bracket joint 12 is connected with the hydraulic hose 13 and forms a hydraulic pipeline; the connecting hole is provided with a top column 15 that slides with the connecting hole at one end close to the annular groove; the expansion block 10 is fixed to the top column 15 by screws, and when the hydraulic system has no pressure, the expansion block 10 is constrained by the sealing leather cup 14. When active sealing is adopted, the hydraulic system boosts the pressure so that the hydraulic oil pushes the top column 15 to slide radially outside the circumference through the connecting hole in the active rotating bracket 2, and drives the expansion block 10 to be ejected outward, thereby expanding the sealing leather cup, and the sealing leather cup 14 is fixedly connected to the outside of the disc of the active rotating bracket 2.

[0014] There are multiple expansion blocks 10. The expansion blocks 10 cooperate with corresponding top columns 15, and drive the sealing cup 14 to expand under the push of hydraulic oil to achieve active sealing effect.

[0015] Each of the expansion blocks 10 is configured as an arc. The expansion block 10 matches the shape of the arc groove and does not cause the sealing cup 14 to deform when idle.

[0016] Each of the expansion blocks 10 has a groove at one end and a projection at the other end, with the projections on two adjacent expansion blocks 10 matching the grooves. This ensures that when the expansion blocks 10 are lifted up, they fully contact the sealing cups 14. If the projection of the expansion blocks 10 is rectangular, a gap will remain between the two adjacent expansion blocks 10 after the expansion blocks 10 are lifted up, resulting in insufficient contact between the sealing cups 14 and the expansion blocks 10, which is likely to lead to poor sealing.

[0017] Reinforcement ribs are provided at the connection positions between the connecting frame and the disc of the active rotating bracket 2 .

[0018] There are multiple guide wheels 8 and guide wheel shafts 9.

[0019] The working principle of the utility model is: the matching base of the plugging head is hoisted by using a steel wire rope or other hoists to a designated site.

[0020] Connect the blocking manifold to the blocking cylinder, drive out the blocking cylinder main shaft and connect it to the active bracket 1 as a whole. At this time, the hydraulic hose 13 should be well connected to the rotating frame joint 12 in advance.

[0021] Slowly retract the main shaft of the sealing cylinder, generally to zero position, measure the distance data between the support block 4 and the end face of the adapter, and calculate the theoretical position of the device in the pipe body.

[0022] Use bolts to connect the flange of the junction box to the valve installed on the blocking tee welded to the pipeline. When plugging, the pressure balancing device should be adjusted to the open state.

[0023] Before executing the above steps, the previous work such as drilling and pressure testing should be carried out according to the process flow of the specific construction situation.

[0024] The supporting hydraulic device is used to drive the hydraulic oil to drive the top column 15, thereby driving the expansion block 10 to expand radially of the tube body, and further driving the sealing leather cup 14 to compress radially, thereby achieving the active sealing effect.

[0025] When the sealing is completed, the pressure in the hydraulic system of the active sealing device should be released first. At this time, the expansion block 10 will shrink to its initial state due to the elasticity of the leather cup and the constraint of the pipeline. Then the sealing cylinder main shaft can be retracted to complete the removal of the seal.

[0026] Note that the structural dimensions of this device are consistent for pipes of the same diameter. The sealing operation of pipes of different diameters can be completed by replacing different types of sealing leather cups 14. The adjusting block 3 and the supporting block 4 are also adapted according to different pipe wall thicknesses.

Claims

1. An active sealing plug, characterized in that: The invention comprises an active support (1), an active rotating support (2) and an adjusting block (3); the active support (1) is connected to a matching blocking cylinder; the active rotating support (2) comprises a connecting frame and a disc fixedly connected to the connecting frame; the connecting frame on the active rotating support (2) is rotatably connected to the active support (1) via a movable shaft (6); a movable shaft pressure cover (7) is fixedly connected to the outer side of the connecting frame on the active rotating support (2); a contact assembly (5) is fixedly connected to the disc of the active rotating support (2); the adjusting block (3) is fixedly connected to the active support (1) and contacts the pipe wall after the hole is opened; a support block is fixedly connected to the bottom of the side of the active support (1) (4); the contact assembly (5) is connected to a guide wheel (8) via a guide wheel shaft (9); an annular groove is provided on the outer circumferential surface of the rotating disk of the active rotating bracket (2), and a plurality of interconnected communicating holes are provided on the inner wall of the annular groove; the communicating hole is also connected to a rotating bracket joint (12) fixedly connected to the disk of the active rotating bracket (2); the rotating bracket joint (12) is connected to a hydraulic hose (13) to form a hydraulic pipeline; a top column (15) that slides with the communicating hole is provided at one end of the communicating hole close to the annular groove; an expansion block (10) is fixedly connected to the top column (15); a sealing leather cup (14) is fixedly connected to the outer side of the disk of the active rotating bracket (2).

2. The active sealing plug according to claim 1, characterized in that: There are a plurality of expansion blocks (10).

3. The active sealing plug according to claim 2, characterized in that: Each of the expansion blocks (10) is configured to be arc-shaped.

4. The active sealing plug according to claim 3, characterized in that: One end of each expansion block (10) is provided with a groove, and the other end is provided with a convex block, and the convex blocks on two adjacent expansion blocks (10) match the groove.

5. The active sealing plug according to claim 4, characterized in that: Reinforcement ribs are provided at the connection position between the connecting frame and the disc of the active rotating bracket (2).

6. The active sealing plug according to claim 5, characterized in that: There are multiple guide wheels (8) and guide wheel shafts (9).

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