RU2338954C1 - Pipeline shut-off damper - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: one of tight elastic chamber end face walls is furnished with pipe union passing inside the said chamber and in into the circular disk, the aforesaid union being arranged along the said chamber axis. Low friction factor material, sliding layer, is arranged on the said tight elastic chamber to get deformed on forcing air into the latter. Load-bearing net-shaped carcass envelopes the said tight elastic chamber with the said sliding layer to increase its diameter size decreasing, at the same time, the axial size. The power-bearing carcass accommodates the second sliding layer with the coating layer applied thereto to come into contact with the inner surface of the pipe to be shut-off.

EFFECT: higher radial deformation resistance along with higher carcass strength.

6 cl, 2 dwg

Description

The invention relates to devices for blocking pipelines, in particular, for the period of repair. The silencing device can be used in the oil and oil refining industries, as well as in trunk pipelines, water supply systems and sewer networks.

Known rubber-cord casing for blocking pipelines (RU 2273788, 2006.04.10), containing a sealed elastic cylindrical chamber with end walls, one of which is equipped with a pipe fitting located along the chamber axis, passing inside the chamber into an annular disk made of rubber-reinforced cord of threads and a power frame covering a sealed cylindrical chamber, including a cylindrical shell and lap connected to it, located on the end walls of the chamber end walls power skeleton made of separate radially directed and partially overlapping one another along the strips with bent ends of the axis of the chamber, wherein the filaments in the bands are directed along the strips, and disposed on the frame structure a rubber coating layer. The power frame is multi-layered, while the overlaps in the layers of the power frame reinforcing the cylindrical and end parts of the cylindrical chamber are shifted relative to each other in the axial direction in the cylindrical part and in the radial direction in the end part, and the overlap is from 30 to 250 mm, and the ends of the strips bent along the axis of the chamber are located on the inner surface.

Also known is a damping rubber-cord device for blocking pipelines (RU 2277661, 2006.06.10), comprising an inner chamber formed by a cylindrical and two end walls mating with it, including an outer cover rubber shell, a reinforcing frame, consisting of layers of rubberized cord fabric reinforcing the cylindrical and end walls, and an internal sealing rubber shell, and one of the end walls is equipped with a pipe fitting located along the axis of the chamber, passing inside the chamber into rings second drive coupled to the end wall of the chamber through the rubber layer, in addition, rubberised cord fabric carcass, reinforcing both end walls are made of separate radially directed and partially overlapping one another bands. In which the strips of rubber-cord fabric reinforcing the end walls are arranged in at least two layers, the number of layers of strips reinforcing the end walls corresponding to the number of layers of rubber-cord fabric reinforcing the cylindrical wall of the chamber, the length of the radially directed strips of rubber-cord fabric in the end walls is not exceeds the diameter of the chamber, and the end sections of the layers of rubber-cord fabric reinforcing the cylindrical wall of the chamber are bent to strips of rubber-cord fabric located on the end wall, with a partial their overlap in a plot of at least 0.1 strip length, and sections of strips of rubber-cord fabric overlapping by each of the layers of rubber-cord fabric are shifted relative to each other in the radial direction by the value h≥d, where d is the diameter of the cord of rubber-cord fabric.

General disadvantages of these known devices for blocking pipelines are limited deformation ability and low strength of the power frame. An increase in the ply or number of threads in the layers of the cord carcass increases the strength of the cord carcass, but reduces the operability of the device, because most of the pressure of the compressed gas supplied into the device will be spent on overcoming the elastic forces of the vulcanized multilayer power frame, increasing the diameter of the device and, therefore, increasing the load on the cord. Also, increasing the layer capacity of the power frame significantly increases the mass characteristics of devices for blocking pipelines, which, in turn, makes it difficult to carry out repair and restoration work.

The technical result of the invention is the creation of a silencing device capable of blocking pipelines of various diameters and at the same time withstand leak tightness in a wide range of pressure drop in the pipeline.

The technical result is achieved by the fact that, in contrast to the devices for blocking pipelines known from the prior art, in the present invention, the power frame is mesh-like, capable of increasing the diametric size, while decreasing the axial size, and is located between two sliding layers located on the outer surface of the sealed elastic chamber and the inner surface of the cover layer of the silencing device. The sliding layers are made of a material with a low coefficient of friction and allow the mesh power frame to increase the diametric size with minimal loss. This is because the cells of the mesh power frame are not filled with elastic material, have a high deformation ability due to the rotation of the diamond-shaped cells of the non-vulcanized mesh power frame, and the energy for deformation of the power frame in the diametrical direction is spent only on overcoming the friction force between the threads of the power frame, and also on the friction forces of the frame on the sliding layers. The mesh power frame can be made of interwoven reinforcing threads that are not fixed at the intersection of the threads, and interwoven reinforcing threads that are fixed at the intersection of the threads. Sliding layers made of a material with a low coefficient of friction should retain their properties in the temperature range from -50 ° C to + 180 ° C. This temperature range is due to the fact that when operating in the regions of the Far North, the device must be operable at low temperatures. The upper limit of the temperature range is due to the manufacturing process of the silencing device in the conditions of tire production during the vulcanization of the coating layer. Fluoroplastic in the form of thin tapes can be a material for the manufacture of sliding layers.

The invention is illustrated by drawings.

Figure 1 shows the proposed silencing device, General view;

figure 2 shows an embodiment of the mesh power frame in the form of a braid: in the initial state and in the deformed state.

The silencing device (Fig. 1) consists of a sealed elastic chamber 1 with end walls 2, 3, one of which is equipped with a pipe fitting 4 located along the camera axis and passing inside the chamber into an annular disk 5. The pipe fitting is designed to supply and discharge compressed gas. A sliding layer 6 is located on the sealed elastic chamber 1. A power frame 7 covers the chamber 1 with the sliding layer 6 located on it. A sliding layer 8 is located on top of the power frame 7. An elastic cover layer 9 is placed on the surface of the sliding layer 8. The outer surface of the elastic cover layer 9 in the area of contact with the silenced pipeline, it can be equipped with annular sealing protrusions 10, which during operation improve sealing and adhesion to the blocked pipeline.

Muffler works as follows.

A hose (not shown) is connected to the pipe fitting 4, and the device is inserted into the plug pipe. Compressed gas is supplied to the device from a source of compressed air or other gas through a hose to a pipe fitting 4, and the sealed elastic chamber 1 expands and acts through a sliding layer 6 on a mesh power frame 7. The mesh power frame 7 increases in diameter and through the sliding layer 8 transfers force to the elastic cover layer 9. The elastic cover layer 9 increases its diameter until it contacts the inner surface of the blocked pipeline. Thus, the device completely closes the pipeline and eliminates the possibility of outflow of liquid from it.

The manufacture of the device according to the proposed method in the conditions of tire production is as follows.

A rubber sealed elastic chamber 1 is made, equipped with a pipe fitting 4. After vulcanization, the chambers are filled with compressed air to a straightened state. A sliding layer 6 of thin fluoroplastic tapes or cellophane is put on the camera. After that, a mesh power frame 7 is placed on the sliding layer and its ends are fixed from the end sides. Next, a second sliding layer 8 is put on the power frame, for example, of thin fluoroplastic tapes or cellophane.

The last coating rubber layer 9 is collected, and the preform is placed in the mold for further vulcanization.

The proposed design of the silencing device with the proposed mesh power frame located between two sliding layers, allows you to cover a wide range of diameters of the blocked pipelines, and also increases the range of sealed pressure drop in the pipeline.

Claims (6)

1. A silencing device for blocking pipelines, comprising a sealed elastic chamber with end walls, one of which is equipped with a pipe fitting located along the axis of the chamber, passing inside the chamber into an annular disk, a power frame covering the sealed elastic chamber and a coating layer placed on the power frame, characterized in that the power frame, covering a sealed elastic chamber, is located between two layers with a low coefficient of friction, located on the outer surface a sealed flexible chamber and the inner surface of the cover layer muffling device. 2. A silencing device for blocking pipelines according to claim 1, characterized in that the power frame is made in the form of a shell of interwoven reinforcing threads, capable of increasing the diametric size, while reducing the axial size. 3. The silencing device for blocking pipelines according to claim 1, characterized in that the power frame is made in the form of a mesh shell capable of increasing the diametric size, while reducing the axial size. 4. The silencing device for blocking pipelines according to claim 1, characterized in that the layers with a low coefficient of friction are made of a material that retains its properties in the temperature range from -50 to + 180 ° C. 5. A silencing device for blocking pipelines according to claim 1, characterized in that the layers with a low coefficient of friction are made by winding from tapes of thin film material. 6. A silencing device for blocking pipelines according to claim 1, characterized in that on the surface of the coating layer, annular sealing protrusions are arranged along the axis.

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