Pipeline pressure tapping isolation structure

Abstract

The utility model discloses a pipeline pressure tapping isolation structure which comprises a pipeline, a first fastening frame is arranged at the upper end of the pipeline, a second fastening frame is arranged at the lower end of the pipeline, a sealing gasket is fixedly arranged on the surface of the outer side of the lower end of the first fastening frame, and an extension pipe is fixedly arranged at the upper end of the first fastening frame. A connecting pipe is fixedly arranged at the upper end of the extension pipe, a first connecting flange is arranged between the connecting pipe and the extension pipe, a detection mechanism for testing the airtightness of the installed device is arranged on one side of the surface of the extension pipe, and the detection mechanism comprises a control valve, a connector, an air bag and a one-way valve body. After the device is fixed on the outer side of the pipeline, the sealing detection device is arranged, the device is simple in structure and convenient to use, and follow-up trepanning work continues after it is guaranteed that the sealing performance of the whole device does not have problems; therefore, the possibility of accidental leakage after opening can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of isolation structures, in particular to a pipeline pressure-opening isolation structure. Background Art

[0002] Pipeline pressure drilling is a technology that uses mechanical cutting to machine a circular hole in a running pipeline under a closed state. This technology is suitable for normal maintenance and renovation of pipelines with various media such as water, crude oil, refined oil, chemical media, natural gas, etc., as well as emergency repairs for emergencies, such as pressure repairs, replacement of corroded pipe sections, installation of devices, and distribution and transformation operations.

[0003] When opening a hole under pressure in a pipeline, it is necessary to isolate the pipeline to prevent the material inside the pipeline from spraying out after the opening. Such isolation devices in the prior art generally need to be fixed at the target position of the pipeline in various forms when used; they can be welded or bolted to be fixedly connected to the pipeline; and after the connection, the airtightness of the connection needs to be ensured before the hole is opened. However, after the installation of such isolation devices in the prior art, it is more troublesome to detect the airtightness, and external equipment needs to be used for airtightness detection. There is no simple airtightness detection structure itself. Therefore, this problem requires an improved isolation structure for opening a hole under pressure in the pipeline. Utility Model Content

[0004] The purpose of the utility model is to provide a pipeline pressure opening isolation structure to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pipeline pressure opening isolation structure, comprising a pipeline, a first fastening frame is arranged at the upper end of the pipeline, a second fastening frame is arranged at the lower end of the pipeline, a sealing gasket is fixedly arranged on the outer surface of the lower end of the first fastening frame, an extension tube is fixedly arranged at the upper end of the first fastening frame, a connecting tube is fixedly arranged at the upper end of the extension tube, a first connecting flange is arranged between the connecting tube and the extension tube, a detection mechanism for the air tightness after the test device is installed is arranged on one side of the surface of the extension tube, the detection mechanism comprises a control valve, a connector, an airbag, and a one-way valve body, a control valve is fixedly arranged on one side of the surface of the extension tube, a connector is arranged on the surface of the control valve by threaded engagement, an airbag is arranged at one end of the connector, and a one-way valve body is arranged between the airbag and the connector and on the side of the airbag away from the control valve.

[0006] Preferably, a ball is movably engaged inside the one-way valve body, and a spring is provided inside the one-way valve body on one side of the ball. The one-way valve body and the internal ball and spring can limit the flow direction of the gas, so that the gas can only enter the airbag from the connecting head and then be discharged from the rear end of the airbag.

[0007] Preferably, a valve housing is fixedly arranged in the middle of the connecting pipe, a slide groove is opened in the middle of the inner side of the valve housing, and a gate plate is movably arranged inside the slide groove. A gate valve can be formed by the valve housing, the slide groove and the gate plate to control the conduction of the connecting pipe. It should be noted that this device can only use gate valves and ball valves but not butterfly valves, because the middle of the connecting pipe needs to be inserted with a drill rod and a drill bit to perform drilling operations on the pipeline later.

[0008] Preferably, a screw is movably provided on one side of the inner part of the valve housing through a bearing, and the middle part of the inner side of the gate plate is movably sleeved on the outer surface of the screw through a thread; the gate plate can be driven to slide left and right inside the slide groove by rotating the screw; thereby, the flow channel of the connecting pipe can be closed or opened.

[0009] Preferably, a second connecting flange is fixedly provided on the upper end of the connecting pipe, and the connecting pipe can be conveniently connected to the drilling equipment through the second connecting flange; Figure 1 The state shown is a common state of pressurized pipe opening in the prior art; at this time, the drilling equipment is connected through the second connecting flange. After being connected to the second connecting flange, such drilling equipment can form a closed space with the connecting pipe, and the drill rod and drill bit of the drilling equipment can move up and down; the highest point can be moved to the upper end of the gate plate; since these are all mature prior arts; and all protections of this application document are the isolation structure of pressurized pipe opening; therefore, this application document will no longer elaborate on the subsequent drilling principles.

[0010] Preferably, a locking screw is provided between the first fastening frame and the second fastening frame, and the first fastening frame and the second fastening frame can be quickly fixed at a predetermined position of the pipeline by the locking screw, and the sealing gasket can be ensured to be tightly attached to the outer surface of the pipeline.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model can know the air tightness of the extension tube by observing the expansion of the airbag; after the device is fixed on the outside of the pipe, the air tightness test can be carried out; thus, the possibility of accidental leakage after opening can be effectively reduced.

[0013] 2. The utility model has a simple structure and can perform airtightness detection using two one-way valve bodies and an air bag. It is easy to operate and only requires repeatedly squeezing the air bag during detection. There are no complicated operating steps, so it can be easily promoted and used. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of a pipeline pressure opening isolation structure of the utility model;

[0015] Figure 2 This is a bottom view of a pipeline pressure opening isolation structure of the utility model;

[0016] Figure 3 It is a cross-sectional view of a one-way valve body in a pipeline pressure opening isolation structure of the utility model;

[0017] Figure 4 The utility model is a cross-sectional view of a valve shell in a pipeline pressure opening isolation structure.

[0018] Figure 5 The utility model is a pipeline pressure opening isolation structure Figure 3 Magnified view at A in the middle.

[0019] In the figure: 1. pipeline; 2. first fastening frame; 3. second fastening frame; 4. sealing gasket; 5. extension pipe; 6. connecting pipe; 7. first connecting flange; 8. control valve; 9. connecting head; 10. air bag; 11. one-way valve body; 12. ball; 13. spring; 14. valve housing; 15. slide groove; 16. gate; 17. screw; 18. second connecting flange; 19. locking screw. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5 The utility model provides a technical solution: a pipeline pressure opening isolation structure, comprising a pipeline 1, a first fastening frame 2 is arranged at the upper end of the pipeline 1, a second fastening frame 3 is arranged at the lower end of the pipeline 1, a sealing gasket 4 is fixedly arranged on the outer surface of the lower end of the first fastening frame 2, an extension tube 5 is fixedly arranged at the upper end of the first fastening frame 3, a connecting tube 6 is fixedly arranged at the upper end of the extension tube 5, a first connecting flange 7 is arranged between the connecting tube 6 and the extension tube 5, a detection mechanism for the air tightness after the test device is installed is arranged on one side of the surface of the extension tube 5, the detection mechanism comprises a control valve 8, a connector 9, an airbag 10, and a one-way valve body 11, a control valve 8 is fixedly arranged on one side of the surface of the extension tube 5, a connector 9 is arranged on the surface of the control valve 8 through a threaded movable screw connection, an airbag 10 is arranged at one end of the connector 9, and a one-way valve body 11 is arranged between the airbag 10 and the connector 9 and on the side of the airbag 10 away from the control valve 8.

[0022] A ball 12 is movably engaged inside the one-way valve body 11, and a spring 13 is provided inside the one-way valve body 11 on one side of the ball 12. The one-way valve body 11 and the ball 12 and spring 13 inside the one-way valve body 11 can limit the flow direction of the gas, so that the gas can only enter the airbag 10 from the connector 9 and then be discharged from the rear end of the airbag 10.

[0023] A valve housing 14 is fixedly arranged in the middle of the connecting pipe 6, a slide groove 15 is provided in the middle of the inner side of the valve housing 14, a gate plate 16 is movably engaged inside the slide groove 15, and a gate valve can be formed by the valve housing 14, the slide groove 15, and the gate plate 16 to control the conduction of the connecting pipe 6; it should be noted that only gate valves and ball valves can be used in this device, and butterfly valves cannot be used; because the middle of the connecting pipe 6 needs to be inserted with a drill rod and a drill bit to perform drilling operations on the pipeline 1 later;

[0024] A screw 17 is movably provided on one side of the valve housing 14 through a bearing, and the middle part of the inner side of the gate plate 16 is movably sleeved on the outer surface of the screw 17 through a thread; the gate plate 16 can be driven to slide left and right inside the slide groove 15 by rotating the screw 17; thereby, the flow channel of the connecting pipe 6 can be closed or opened;

[0025] The upper end of the connecting pipe 6 is fixedly provided with a second connecting flange 18, through which the connecting pipe 6 can be conveniently connected to the drilling equipment; Figure 1 The state shown is a common state of the pressurized opening of the pipeline 1 in the prior art; at this time, the drilling equipment is connected through the second connecting flange 18. After being connected to the second connecting flange 18, such drilling equipment can form a closed space with the connecting pipe 6, and the drill rod and drill bit of the drilling equipment can move up and down; the highest point can be moved to the upper end of the gate 16; since all of these are mature prior arts; and the application document protects the pressurized opening isolation structure of the pipeline 1; therefore, the application document will not elaborate on the subsequent drilling principle;

[0026] A locking screw 19 is provided between the first fastening frame 2 and the second fastening frame 3 , and the first fastening frame 2 and the second fastening frame 3 can be quickly fixed at a predetermined position of the pipeline 1 by the locking screw 19 , and the sealing gasket 4 can be ensured to be tightly attached to the outer surface of the pipeline 1 .

[0027] Working principle: When using the device, the first fastening frame 2 and the second fastening frame 3 are sleeved at the predetermined position of the pipe 1; then the locking screw 19 is tightened; the first fastening frame 2 and the second fastening frame 3 can be firmly fixed on the outer surface of the pipe 1; and at this time, the sealing gasket 4 can be closely attached to the outer surface of the pipe 1;

[0028] After the installation of the device is completed, do not perform drilling operations first; the air tightness between the device and the pipeline 1 should be checked first; when checking the air tightness, turn the screw 17, and push the gate 16 to move to the left inside the slide groove 15 through the screw 17 so that the flow channel of the connecting pipe 6 is in a sealed and closed state; then, under the action of the sealing gasket 4 and the gate 16, the inside of the extension pipe 5 should be in a fully sealed state; at this time, the control valve 8 can be opened (the control valve 8 can be a ball valve, a butterfly valve, or any other valve that can ensure the closure of the flow channel); so that the control valve 8 is in a conducting state; at this time, the staff can squeeze the airbag 10; and when the airbag 10 is squeezed, the air inside the airbag 10 can be discharged from the one-way valve body 11 at the rear end of the airbag 10; and after the air inside the airbag 10 is discharged, a negative pressure state similar to a vacuum is formed inside the airbag 10 The airbag 10 is then released; at this time, due to the atmospheric pressure inside the extension tube 5, the one-way valve body 11 between the airbag 10 and the connector 9 can be squeezed, so that the one-way valve body 11 is turned on; then the air inside the extension tube 5 is replenished into the airbag 10; then the staff presses the airbag 10 again to squeeze out the air inside the airbag 10; this is repeated many times; if the air tightness inside the extension tube 5 is good at this time, with the repeated squeezing of the airbag 10, the air pressure inside the extension tube 5 will gradually decrease, until it can no longer overcome the elastic force of the spring 13, pushing the one-way valve body 11 to turn on; in this way, after the air inside the airbag 10 is squeezed out, it cannot be replenished with the air inside the extension tube 5 and will remain in a deflated state; and as long as the air tightness is good, the airbag 10 will not swell after waiting for a period of time;

[0029] If there is a problem with the air tightness inside the extension tube 5, and there is any air leakage, no matter how the airbag 10 is squeezed, the airbag 10 will expand again; or the airbag 10 will expand again after waiting for a period of time; in this way, the device can know the air tightness inside the extension tube 5 by observing the expansion of the airbag 10; in this way, after the device is fixed on the outside of the pipeline 1, the air tightness test can be performed, thereby effectively reducing the possibility of accidental leakage after the opening;

[0030] After the air tightness test is completed, the drilling equipment is connected through the second connecting flange 18. After being connected to the second connecting flange 18, this type of drilling equipment can form a closed space with the connecting pipe 6 and the extension pipe 5, and the drill rod and drill bit part of the drilling equipment can move up and down; the highest point can be moved to the upper end of the gate 16; when drilling, the gate 16 is opened, the control valve 8 is closed (the control valve 8 must be in the closed state at this time), and then the drill rod and the drill bit are rotated and moved down to drill through the upper end of the pipeline 1; then the drill rod and the drill bit are moved up to the upper end of the gate 16; then the gate 16 is closed, and then the drilling equipment is removed; and then the second connecting flange 18 is used to connect the equipment to be connected to finally complete all operations.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] 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 pipeline pressure opening isolation structure, comprising a pipeline (1), Features: A first fastening frame (2) is arranged at the upper end of the pipeline (1), a second fastening frame (3) is arranged at the lower end of the pipeline (1), a sealing gasket (4) is fixedly arranged on the outer surface of the lower end of the first fastening frame (2), an extension pipe (5) is fixedly arranged at the upper end of the first fastening frame (2), a connecting pipe (6) is fixedly arranged at the upper end of the extension pipe (5), a first connecting flange (7) is arranged between the connecting pipe (6) and the extension pipe (5), and a testing device is arranged on one side of the surface of the extension pipe (5). A detection mechanism for air tightness after installation, the detection mechanism comprising a control valve (8), a connector (9), an airbag (10), and a one-way valve body (11); a control valve (8) is fixedly arranged on one side of the surface of the extension tube (5); a connector (9) is arranged on the surface of the control valve (8) by means of a threaded connection; an airbag (10) is arranged at one end of the connector (9); and a one-way valve body (11) is arranged between the airbag (10) and the connector (9) and on the side of the airbag (10) away from the control valve (8).

2. A pipeline pressure opening isolation structure according to claim 1, Features: A ball (12) is movably engaged inside the one-way valve body (11), and a spring (13) is arranged on one side of the ball (12) inside the one-way valve body (11).

3. A pipeline pressure opening isolation structure according to claim 1, Features: A valve housing (14) is fixedly arranged in the middle of the connecting pipe (6), a slide groove (15) is provided in the middle of the inner side of the valve housing (14), and a gate plate (16) is movably engaged inside the slide groove (15).

4. A pipeline pressure opening isolation structure according to claim 3, Features: A screw rod (17) is movably arranged on one side of the valve housing (14) via a bearing, and the middle portion of the inner side of the gate plate (16) is movably sleeved on the outer surface of the screw rod (17) via a thread.

5. A pipeline pressure opening isolation structure according to claim 1, Features: A second connecting flange (18) is fixedly provided on the upper end of the connecting pipe (6).

6. A pipeline pressure opening isolation structure according to claim 1, Features: A locking screw (19) is provided between the first fastening frame (2) and the second fastening frame (3).

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