High-pressure pipeline under pressure plugging device and method

Abstract

The present invention relates to a high-pressure pipeline under-pressure plugging technology, and specifically to a high-pressure pipeline under-pressure plugging device and method. The high-pressure pipeline under-pressure plugging device comprises two pressure-bearing shells, which cover the leakage points of the pressure-bearing pipeline. Two limit plates are arranged inside the pressure-bearing section of each pressure-bearing shell. The limit plates divide the pressure-bearing section into three glue injection spaces: a sealing chamber A, a sealing chamber B, and a pressure chamber. A top screw is sleeved on the pressure-bearing pipeline and inserted into the fixed section. The end of the top screw is tightly pressed against the limit plate and sealed with the limit plate. Sealant is injected into the glue injection space. The sealant is injected into the three glue injection spaces in the pressure-bearing shell respectively, which can effectively ensure that the sealant is fully filled, and the plugging effect is obvious. At the same time, the glue injection efficiency can be improved, which is convenient for fast and effective plugging.

Description

Technical Field

[0001] The invention relates to a high-pressure pipeline under-pressure plugging technology, and in particular to a high-pressure pipeline under-pressure plugging device and method. Background Art

[0002] Pressure plugging technology is widely used in chemical production, pipeline transportation and other fields, avoiding material discharge in vehicle ordering operations, and has huge economic benefits. In the chemical industry, various pipelines and containers are corroded, perforated, leaked, and dripped, which often occur. Pressure plugging usually requires the production and installation of fixtures, and then the special pressure plugging sealant is injected into the fixture through a special glue injection tool to form a dense filler and a new seal. However, the existing plugging methods and plugging devices are prone to secondary dripping and poor sealing. Summary of the invention

[0003] The purpose of the present invention is to provide a new pressure plugging device and a plugging method to solve the problem of secondary corrosion leakage that often occurs in the current pressure plugging construction.

[0004] The technical solution provided by the present invention is:

[0005] The pressure plugging device for a high-pressure pipeline comprises two pressure-bearing shells, which cover the leakage point of the pressure pipeline. The pressure-bearing shells are composed of a pressure-bearing section and a fixed section. Two limit plates are arranged inside the pressure-bearing section of each pressure-bearing shell. The limit plates on the two pressure-bearing shells are correspondingly sealed and connected and sealed with the pressure pipeline. The limit plates correspondingly arranged on the two pressure-bearing shells constitute two groups of limit plates. The two groups of limit plates divide the pressure section into three glue injection spaces: a sealing chamber A, a sealing chamber B, and a pressure chamber. The leakage point is located in the pressure chamber. The top screw is sleeved on the pressure pipeline and inserted into the fixed section. The end of the top screw is tightly pressed against the limit plate and is sealed with the limit plate. Sealant is injected into the sealing chamber A, the sealing chamber B, and the pressure chamber.

[0006] Specifically, a pressure-bearing flange is arranged between the end of the top screw and the limiting plate.

[0007] Specifically, a metal sealing gasket is arranged between the pressure-bearing flange and the limiting plate.

[0008] Specifically, the top screw is sealed and connected to the pressurized pipe.

[0009] Preferably, the outer surface of the top screw is provided with an external thread, and the inner walls of the fixed sections of the two pressure-bearing shells are provided with internal threads, and the external threads match the internal threads.

[0010] Preferably, the top screw is composed of two semi-cylinders, the outer periphery of the outer end of the top screw has a prismatic structure, and the two semi-cylinders are connected by a top screw inner thread.

[0011] Preferably, the pressure-bearing flange is composed of two semicircular rings and is connected by screws.

[0012] The present invention also provides a method for plugging leaks under pressure in a high-pressure pipeline, comprising the following steps:

[0013] 1) Measure the position of the leak point on the pressurized pipeline, install a limit plate on one side of the leak point, and install a fixed top screw on the outside of the limit plate, with the end of the top screw pointing to the leak point;

[0014] 2) Install another limit plate on the other side of the leak point, and install a fixed top screw on the outside of the other limit plate, with the end of the top screw pointing to the leak point;

[0015] 3) Apply sealant on the inner wall of the pressure-bearing shell at the position corresponding to the limit plate, and assemble it to the pressurized pipeline to cover the leakage point. The pressure-bearing section of the pressure-bearing shell is divided into three glue injection spaces, namely, sealing chamber A and sealing chamber B, by the limit plate. The fixed section of the pressure-bearing shell is connected to the top screw (4);

[0016] 4) Use the glue injection assembly to inject sealant into the sealing cavity A, the sealing cavity B and the pressure-bearing cavity in the pressure-bearing shell respectively, and the sealant solidifies and maintains pressure;

[0017] 5) The pressure chamber is under pressure and the leak is plugged.

[0018] Specifically, in steps 1) and 2), before installing the top screw, insert the metal sealing gasket into the sealing surface of the limit plate, apply sealant on both sides of the pressure-bearing flange, apply sealant on the connecting surface of the top screw, assemble the top screw on the pressurized pipe, and push the pressure-bearing flange and the metal sealing gasket against the limit plate and tighten them.

[0019] The present invention can effectively reduce the secondary corrosion of the chemical substances in the high-pressure pipeline to the pressure-bearing shell and the sealing structure through the cooperation of the limit plate and the top screw. In addition, the sealant is injected into the three injection spaces in the pressure-bearing shell respectively, which can effectively ensure that the sealant is fully filled, and the plugging effect is obvious. At the same time, the injection efficiency can be improved, which is convenient for fast and effective plugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of Example 1;

[0021] Figure 2 is a schematic structural diagram of Example 1;

[0022] Figure 3 is a schematic structural diagram of Example 2;

[0023] Figure 4 is a schematic structural diagram of Example 2;

[0024] Figure 5 It is a three-dimensional diagram of a pressure flange;

[0025] Figure 6 It is the assembly structure diagram of the pressure flange;

[0026] Figure 7 This is the assembly structure diagram of the top screw and the pressurized pipe;

[0027] Figure 8 is a cross-sectional view of the threaded portion of the top screw;

[0028] Fig. 9 It is a schematic diagram of the structure of the top wire;

[0029] Fig.10 of Figure 1 Enlarged view of part A in the middle.

[0030] 1-pressure-bearing shell, 2-pressure-bearing flange, 3-limiting plate, 4-top screw, 5-pressure-bearing shell internal thread, 6-top screw internal thread, 7-pressure relief valve, 8-injection valve, 9-check valve, 10-metal sealing gasket, 11-pressurized pipeline, 12-vent valve, 13-pressure gauge, 14-pressure-bearing shell screws, 15-leakage point, 16-sealing chamber A, 17-sealing chamber B, 18-pressure chamber, 19-screws. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] In this embodiment, the leakage point 15 is located in the straight pipe section of the pressurized pipeline 11 .

[0034] A pressure plugging device for a high-pressure pipeline comprises two pressure-bearing shells 1, which cover the leakage point 15 of the pressure pipeline 11. The pressure-bearing shells 1 are composed of a pressure-bearing section and a fixed section. Two limit plates 3 are arranged inside the pressure-bearing section of each pressure-bearing shell 1. The limit plates 3 on the two pressure-bearing shells 1 are correspondingly and sealedly connected to the pressure pipeline 11. The limit plates 3 correspondingly arranged on the two pressure-bearing shells 1 constitute two groups of limit plates 3. The two groups of limit plates 3 divide the pressure section into three injection spaces: a sealing chamber A16, a sealing chamber B17, and a pressure chamber 18. The leakage point 15 is located in the pressure chamber 18. A top screw 4 is sleeved on the pressure pipeline 11 and inserted into the fixed section. The end of the top screw 4 is tightly pressed against the limit plate 3 and is sealed with the limit plate 3. Sealant is injected into the sealing chamber A16, the sealing chamber B17, and the pressure chamber 18.

[0035] The two pressure-bearing housings 1 are connected via pressure-bearing housing screws 14 .

[0036] A pressure-bearing flange 2 is provided between the end of the top screw 4 and the limiting plate 3 .

[0037] A metal sealing gasket 10 is arranged between the pressure-bearing flange 2 and the limiting plate 3 .

[0038] The top screw 4 is sealed and connected to the pressurized pipe 11 .

[0039] The outer surface of the top screw 4 is provided with an external thread, and the inner wall of the fixed section of the two pressure-bearing shells 1 is provided with an internal thread, and the external thread and the internal thread match. The external thread and the internal thread are spiral; or they can be circular, and are composed of a plurality of circular annular grooves. When the external thread and the internal thread are spiral, the two top screws 4 can be rotated to press against the limit plate 3.

[0040] The top screw 4 is composed of two semi-cylinders, the outer periphery of the outer end of the top screw 4 is in a prismatic structure, and the two semi-cylinders are connected by a top screw inner screw 6.

[0041] The pressure flange 2 is composed of two semicircular rings and is connected by screws 19.

[0042] Pressure plugging method for high-pressure pipelines,

[0043] 1) Measure the position of the leakage point 15 on the pressurized pipeline 11, install a limit plate 3 on one side of the leakage point 15, install a fixed top screw 4 on the outer side of the limit plate 3, and the end of the top screw 4 points to the leakage point 15;

[0044] 2) Install another limiting plate 3 on the other side of the leakage point 15, and install a fixed top screw 4 on the outer side of the other limiting plate 3, with the end of the top screw 4 pointing to the leakage point 15;

[0045] 3) Apply sealant on the inner wall of the pressure shell 1 at the position corresponding to the limit plate 3, and assemble it to the pressurized pipe 11 to cover the leakage point 15. The pressure section of the pressure shell 1 is divided into three glue injection spaces, namely, the sealing chamber A16, the sealing chamber B17, and the pressure chamber 18 by the limit plate 3. The straight pipe section of the pressure shell 1 is connected to the top screw 4;

[0046] 4) Use the glue injection assembly to inject sealant into the sealed cavity A16, the sealed cavity B17, and the pressure-bearing cavity 18 in the pressure-bearing housing 1 respectively, and the sealant solidifies and maintains pressure;

[0047] 5) The pressure chamber is under pressure and the leak is plugged.

[0048] In steps 1) and 2), before installing the top screw 4, insert the metal sealing gasket 10 into the sealing surface of the limit plate 3, apply sealant on both sides of the pressure-bearing flange 2, apply sealant on the connecting surface of the top screw 4, assemble the top screw 4 on the pressurized pipe 11 and push the pressure-bearing flange 2 and the metal sealing gasket 10 against the limit plate 3 and tighten them.

[0049] Each glue injection assembly includes a glue injection valve 8, a check valve 9, a pressure relief valve 7, a vent valve 12, and a pressure gauge 13. The glue injection valve 8 and the check valve 9 are connected to the pressure shell 1 through a pipeline. The vent valve 12 and the pressure relief valve 7 are connected to the pressure shell 1 through a pipeline. The pressure gauge 13 is arranged between the pressure relief valve 7 and the pressure shell 1.

[0050] When injecting glue, open the injection valve 8 and the vent valve 12, inject the sealant into the injection space, wait for the sealant to overflow from the vent valve 12, close the vent valve 12, continue injecting glue until the pressure gauge 13 displays 1.5Mpa, close the injection valve 8, the sealant solidifies in the injection space and maintains the pressure, and the injection space is sealed.

[0051] Example 2

[0052] The difference between this embodiment and Embodiment 1 is that the leakage point 15 is located at the elbow of the pressurized pipeline 11 .

[0053] The pressure plugging device for high-pressure pipelines includes two pressure-bearing shells 1, which cover the leakage points 15 of the pressure-bearing pipelines 11. The pressure-bearing shells 1 are composed of a pressure-bearing section and a fixed section. The fixed sections on both sides of the pressure-bearing section are perpendicular to each other, and the top screws 4 in the two fixed sections are perpendicular to each other.

[0054] When installing the limit plates 3 on both sides of the leakage point 15, it is necessary to consider the positions and connection relationship of the two limit plates 3. The space enclosed by the pressure-bearing shell 1 should be divided into three injection spaces, namely, the sealing chamber A16, the sealing chamber B17, and the pressure-bearing chamber 18 by the limit plates 3.

[0055] The position of the glue injection component is adaptively adjusted according to the shape of the glue injection space.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for plugging leaks under pressure in a high-pressure pipeline, characterized in that: The steps include: 1) measuring the position of a leakage point (15) on a pressurized pipeline (11), installing a limit plate (3) on one side of the leakage point (15), and installing a fixed top screw (4) on the outer side of the limit plate (3), with the end of the top screw (4) pointing to the leakage point (15); 2) Install another limiting plate (3) on the other side of the leakage point (15), and install a fixed top screw (4) on the outer side of the other limiting plate (3), with the end of the top screw (4) pointing to the leakage point (15); 3) Apply sealant to the position of the limit plate (3) on the inner wall of the pressure-bearing shell (1), and assemble it to the pressurized pipe (11) to cover the leakage point (15). The pressure-bearing section of the pressure-bearing shell (1) is divided into three injection spaces, namely, a sealing chamber A (16), a sealing chamber B (17), and a pressure chamber (18), by the limit plate (3). The fixed section of the pressure-bearing shell (1) is connected to the top screw (4); 4) using a glue injection assembly to respectively inject sealant into the sealing cavity A (16), the sealing cavity B (17), and the pressure-bearing cavity (18) in the pressure-bearing housing (1), and the sealant is cured to maintain pressure; 5) The pressure-bearing chamber (18) is pressurized to complete the leak plugging; In steps 1) and 2), before installing the top screw (4), the metal sealing gasket (10) is inserted into the sealing surface of the limit plate (3), sealing glue is applied to both sides of the pressure-bearing flange (2), sealing glue is applied to the connecting surface of the top screw (4), the top screw (4) is assembled on the pressurized pipe (11), and the pressure-bearing flange (2) and the metal sealing gasket (10) are pushed toward the limit plate (3) and tightened.

2. The method for plugging leaks under pressure in a high-pressure pipeline according to claim 1, characterized in that: The glue injection assembly comprises a glue injection valve (8), a check valve (9), a pressure relief valve (7), a vent valve (12), and a pressure gauge (13); the glue injection valve (8) and the check valve (9) are connected to the pressure-bearing shell (1) through a pipeline; the vent valve (12) and the pressure relief valve (7) are connected to the pressure-bearing shell (1) through a pipeline; and the pressure gauge (13) is arranged between the pressure relief valve (7) and the pressure-bearing shell (1); When injecting glue, open the glue injection valve (8) and the vent valve (12), inject the sealant into the glue injection space, wait for the sealant to overflow from the vent valve (12), close the vent valve (12), continue injecting glue, and close the glue injection valve (8) until the pressure gauge (13) displays 1.5 MPa. The sealant is solidified in the glue injection space and the pressure is maintained, and the glue injection space is sealed.

3. A device for plugging leaks under pressure in a high-pressure pipeline, which implements the method for plugging leaks under pressure in a high-pressure pipeline according to claim 1. It is characterized in that The invention comprises two pressure-bearing shells (1), the two pressure-bearing shells (1) cover the leakage point (15) of the pressure-bearing pipeline (11), the pressure-bearing shells (1) are composed of a pressure-bearing section and a fixed section, two limit plates (3) are arranged inside the pressure-bearing section of each pressure-bearing shell (1), the limit plates (3) on the two pressure-bearing shells (1) are correspondingly sealed and connected to the pressure-bearing pipeline (11), and the limit plates (3) correspondingly arranged on the two pressure-bearing shells (1) constitute two The two groups of limit plates divide the pressure section into three injection spaces, namely, a sealing chamber A (16), a sealing chamber B (17), and a pressure chamber (18). The leakage point (15) is located in the pressure chamber (18). The top screw (4) is sleeved on the pressurized pipe (11) and inserted into the fixed section. The end of the top screw (4) is tightly pressed against the limit plate (3) and is sealed with the limit plate (3). Sealant is injected into the sealing chamber A (16), the sealing chamber B (17), and the pressure chamber (18).

4. The pressure plugging device for high-pressure pipeline according to claim 3 is characterized in that: A pressure-bearing flange (2) is provided between the end of the top screw (4) and the limiting plate (3).

5. The pressure-sealing device for high-pressure pipeline according to claim 3 is characterized in that: A metal sealing gasket (10) is provided between the pressure-bearing flange (2) and the limiting plate (3).

6. The pressure plugging device for high-pressure pipeline according to claim 3, characterized in that: The top screw (4) is sealed and connected to the pressurized pipeline (11).

7. The pressure plugging device for high-pressure pipeline according to claim 3, 4 or 6, characterized in that: The outer surface of the top screw (4) is provided with an external thread, and the inner walls of the fixed sections of the two pressure-bearing shells (1) are provided with internal threads, and the external threads and the internal threads match each other.

8. The pressure-sealing device for high-pressure pipelines according to claim 7, characterized in that: The top screw (4) is composed of two semi-cylinders, the outer periphery of the outer end of the top screw (4) is in a prismatic structure, and the two semi-cylinders are connected via a top screw inner screw (6).

9. The pressure plugging device for high-pressure pipeline according to claim 4, characterized in that: The pressure-bearing flange (2) is composed of two semicircular rings and is connected by screws (19).

Images