RU2220360C2 - Stack-type stopping unit for shutting-off pipe lines - Google Patents

Abstract

FIELD: construction engineering; repair of pipe lines handling media under pressure. SUBSTANCE: proposed unit includes cylindrical framework and stack of at least two coaxial toroidal envelopes deformed under action of internal pressure shutting-off space between said framework and pipe line. Envelopes have similar width in working position which is equal to difference of radii of outer and inner walls. In specific cases, length of each subsequent envelope exceeds that of previous one; framework is provided with flange having supply passages connected with respective envelope for delivery of medium under pressure to it. Framework may be blind or may be provided with valve. EFFECT: enhanced reliability of shutting-off pipe lines. 5 cl, 2 dwg

Description

 The invention relates to devices used in the repair of water pipes and other pipeline systems, where it is necessary to restrain the high pressure of the liquid.

 Known plugging device for blocking the pipeline, containing the frame, and installed on it a shell that is deformed under pressure (SU 892108 A, F 16 L 55/12, 12/25/1981,).

 The disadvantages of the known device are the design complexity, uneven load distribution and the inability to ensure reliable overlap of the pipeline at high pressures.

 The technical result is the ability to ensure uniform load on the device from the pressure of the liquid throughout the midship section of the pipe and the ability to reliably shut off the pipeline at high ambient pressures.

 The technical result is achieved by the fact that the device for blocking the pipeline contains a cylindrical frame and a package of at least two coaxial toroidal shells mounted on it, deformed under the influence of the pressure of the medium pumped into the shell.

 In addition, all shells can have in working condition the same width equal to the difference between the radii of the outer and inner walls.

 In addition, each shell that follows in the direction from the carcass can have a length longer than the previous one in the initial state, so that in the working state the length of each next shell is not less than the length of the previous one.

 The frame may have a flange with supply channels, each connected to a corresponding shell for supplying a pressure medium thereto.

 The frame can be made deaf or with a valve to relieve excess pressure or to operate the pipeline with reduced throughput.

 Figure 1 shows the silencing device in its original state.

 Figure 2 - device with inflated shells.

 The device comprises a cylindrical frame and a package 2 mounted on it from at least two, for example from three, coaxial toroidal shells 3, deformed under pressure. The device is installed in the pipeline 4. It is desirable that the widths of all shells 3 (equal to the difference between the radii of the inner and outer cylindrical walls) are equal to each other in working condition. It is desirable that each next shell 3, in the blown state, has a longer deflated length than the previous one, so that in a swollen state, the length of each next shell is not less, but better equal to the length of the previous one. The frame 1 has a flange 5 with inlet channels 6, each connected to a corresponding casing for supplying pressure medium thereto. The frame 1 can be made blind or with a valve for relieving excess pressure or for operating a pipeline with a reduced throughput (not shown).

 The overlap of the pipeline is as follows.

 Through the inlet channels 6, located on the flange 5, the medium is supplied under pressure in the cavity of the shells 3 until the pipe section 4 is completely blocked. The package of toroidal shells 3 is able to hold more pressure inside the shell than one shell the size of a package, by reducing the area of the end part of the shell and, accordingly, the stresses in the material of the shells as many times as many shells in the package.

 With increasing pressure inside the shell, the friction force of the shell against the wall increases, and consequently, the amount of puff pressure in the pipe increases, and therefore the outer shell of the package must have increased strength compared to internal ones.

 The device may find application in the repair of water pipes, oil pipelines and other pipeline systems.

Claims (5)

1. A device for blocking a pipeline, comprising a cylindrical frame and a package of at least two coaxial toroidal shells placed one inside the other, deformed under the influence of internal pressure of the medium with the possibility of overlapping the space between the specified frame and the pipeline. 2. The device according to claim 1, characterized in that all the shells are in working condition the same width equal to the difference between the radii of the outer and inner walls. 3. The device according to claim 1 or 2, characterized in that each shell following in the direction from the frame has in its initial state a length greater than the previous one, so that in working condition the length of each next shell is not less than the length of the previous one. 4. The device according to any one of claims 1 to 3, characterized in that the frame has a flange with supply channels, each connected to a corresponding shell for supplying pressure medium thereto. 5. The device according to any one of claims 1 to 4, characterized in that the frame is made deaf either with a valve for depressurizing or for operating a pipeline with a reduced throughput.

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