RU2251046C2 - Folding plug for pipeline - Google Patents

Abstract

FIELD: pipeline transport.

SUBSTANCE: folding plug comprises flexible shell made of a folded pack provided with a connecting pipe. The pack expands and shrinks, when fluid is supplied to and is discharged from the pack, respectively. In addition, the plug is provided with a pipe, which is arranged inside the flexible shell and connects the openings in the opposite faces of the pack. When the shell is shrunk, the pipe is straighten. The pipe is arranged along the central axis of the shell and is corrugated or reinforced.

EFFECT: enhanced reliability.

3 cl, 5 dwg

Description

The invention relates to devices for blocking pipelines, in particular for the period of repair, and may find application as a tube for blocking pipes of water pipelines, oil pipelines and other pipeline systems having a cross section of various profiles.

It is known a damping rubber-cord device for blocking pipelines (RU No. 203779 C1, IPC 7 F 16 L 55/16, publ. 16.06.1995), containing a cylindrical shell reinforced with cord threads with reinforced end walls in the form of a disk, one of which is equipped with a pipe fitting. However, such a device requires a large size of the operating hole for the introduction and installation of the silencing device in the pipeline.

Closest to the proposed is a silencing device for blocking pipelines, containing an elastic shell with a fitting having the shape of a folded package, with a cross section of an S- or Z-shape, and also in the form of an annular spiral, the package being elastically folded with the possibility of unfolding and inflating when the supply of a medium under pressure and elastic folding during pressure relief (RU No. 2174639 C1, IPC 7 F 16 L 55/128, publ. 10.10.2001).

At high pressure (up to 10 atm) in heating systems and water pipes, the tube can be squeezed out, shifted and can get into the welding zone.

The technical result of the invention is the provision of the possibility of discharge of hydrostatic pressure through a silencing device in case of exceeding the permissible pressure and preventing, thus, the movement of the silencing device through the pipeline.

The technical result is achieved by the fact that the silencing device for blocking pipelines, containing an elastic shell with a fitting, having the shape of a folded package, made with the possibility of folding and inflating when the medium is supplied under pressure and elastic folding when removing this medium from it, according to the invention is equipped with a tube located inside the elastic shell connecting the holes in the opposite ends of the package and providing the removal of excess pressure backing fluid outside ruboprovoda, wherein the tube is disposed within the folded envelope in the expanded state.

In addition, the tube can be made flexible, while it can be corrugated or reinforced.

Preferably, the tube is located along the central axis of the elastic sheath.

The proposed device is illustrated by drawings.

Figure 1 shows a General view of the damping device.

In Fig 2. is a view A in Fig. 1.

Figure 3 is a section bB in figure 2.

Figure 4 - cross section of the shell in working condition.

Figure 5 is a view In figure 4.

The following notation is used in the figures:

+ P is the gas pressure in the shell,

Ptr is the pressure in the pipeline behind the shell.

Folding muffler for blocking pipelines contains an elastic sheath 1, folded in a certain way; three fittings: 2 - for supplying and discharging from the envelope of a medium under pressure, for example, compressed gas, 3 - for entering the backing fluid into the through channel, 4 - for withdrawing the blocked liquid from the through channel and outside the pipeline. The fittings 3 and 4 inside the shell are connected to each other by a pipe 5 and form a sealed through channel (see Figs. 1, 2, 3) connecting two parts of the pipeline separated by a silencing device: a work area and an area with a backing fluid.

The elastic shell 1 has the form of a flat package (pillow) folded in such a way that it has the cross section in the shape of the letter S (see FIG. 2), or the letter Z, or a ring, or a spiral, or another. In the manufacture of a flat rectangular bag of rubber-cord material is folded (rolled up) and then vulcanized in the mold, so that in the absence of a medium 1 under pressure, it is folded.

The fittings 2, 3 and 4 are placed on the narrow ends of the shell 1, having the same shape as the cross section of the shell 1, which is parallel to these ends. Fittings 2 and 4 - on the one hand, fitting 3 - on the opposite. The tube 5 is preferably in the form of a flexible sleeve. The sleeve can be made corrugated or reinforced to exclude its deformation. The tube 5 is located along the bends of the shell, so that when the shell 1 is folded, the tube is in a straightened state.

The tube 5 with fittings 3, 4 is preferably located on the central axis of the shell 1 to balance the stresses arising in the end parts of the shell 1 when it is inflated. The fitting 3 is open, and a hose is put on the fitting 4 to drain the backing fluid outside the pipeline. When using the device at low pressures (p≤1 atm), a plug can be put on the fitting 3 and / or 4.

Muffler works as follows. Hoses are connected to the fittings 2 and 4 (not shown in the drawing) and the device is inserted into the pipe when folded through the operating hole (well, pipe end, hole cut into the pipe wall).

From the source of medium under pressure through the nozzle 2 into the shell 1 serves the medium under pressure, while the damping device is first expanded, then swells and hermetically closes the pipeline. A hose connected to the fitting 4 is discharged outside the pipeline.

If the valves are leaking, the liquid accumulates behind the silencing device to a pressure that exceeds the permissible value, the liquid 7 is discharged through the nozzle 3, the through channel 5, the nozzle 4 and the outlet hose outside the work site.

Claims (4)

1. A silencing device for blocking pipelines, containing an elastic shell with a fitting, having the form of a folded package, configured to unfold and inflate when the medium is supplied under pressure and is elastic folded when removing this medium from it, characterized in that it is provided with a tube, located inside the elastic shell and connecting the holes in the opposite ends of the package so that in the folded shell it is in a straightened state. 2. The device according to claim 1, characterized in that the tube is flexible. 3. The device according to claim 2, characterized in that the tube is made corrugated or reinforced. 4. The device according to any one of claims 1 to 3, characterized in that the tube is located along the central axis of the elastic shell.

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