RU2514809C1 - Sliding flange joint of metal pipes - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: different-depth and diameter cupola recesses are made over shell torus toward torus diameter increase from minimum to maximum. Note here that depth of said cupola recesses makes 0.3-1 of recess ID.

EFFECT: higher reliability, simplified design, lower material input.

2 cl, 2 dwg

Description

The invention relates to pipeline transport and can be used in hydrotransport, heat supply and gas supply.

Known flange connection with a bellows compensator (AS 757127 SU, IPC F16L 23/02, publ. 08/15/1980, Bull. No. 30), containing flanges and a bellows with an inner ring mounted in its end section, the inner ring being removable and the annular section of the bellows is made in the form of a corrugation, forming a cavity under the removable ring to be installed.

A disadvantage of the known flange connection with a bellows expansion joint is that when a vacuum is applied to the cavity of the bellows expansion joint, the expansion joint loses its stability in the radial direction, i.e. is compressed, which reduces the reliability of the movable connection of the flanges of metal pipes.

Known movable connection of the flanges of metal pipes (patent 2153123RU, IPC F16L 23/02, publ. 07.20.2000) containing a toroidal shell made of rubber-fabric material, the inner part of the shell is made in the form of a hollow chamber, and fastening to the pipelines is carried out by means of flange connections, which are embedded metal rings with holes for fastening, covered on the entire surface with a rubber-fabric frame with a protective rubber layer.

A disadvantage of the known movable connection of the flanges of metal pipes is the design complexity due to the presence of a hollow chamber, which is almost impossible to mount in a toroidal shell with a large difference in the diameters of the toroidal shell in the flange zone relative to the inner diameter of the torus zone. The presence of a hollow chamber is also a disadvantage of the known construction, since it causes a limitation of the axial deformation of the toroidal shell.

The technical result of the claimed invention is to increase the reliability of the movable connection of the flanges of metal pipes, simplifying the design and reducing the consumption of materials.

The technical result is achieved by the fact that along the torus of the shell, the dome-shaped recesses are made of different depths and different diameters in the direction of increase from the minimum diameter of the torus to its maximum diameter. Moreover, the depth of the dome-shaped recesses is from 0.3 to 1 of the internal radius of the dome-shaped recesses.

The essence of the invention is illustrated by the following drawings:

figure 1 - a movable connection of the flanges of metal pipes;

figure 2 - domed recess of greatest depth on an enlarged scale.

The movable connection of the flanges of metal pipes contains a toroidal shell 1 made of rubber-fabric frame 2, on which the dome-shaped recesses 3 are made of variable depth H and different diameters D upward from the minimum diameter 4 of the torus to its maximum diameter 5 (Fig. 1). Dome-shaped recesses 3 are made spherical, with a radius R, a depth within 0.3R-R in the direction of increase from the minimum diameter 4 of the shell torus to its maximum diameter 5 (figure 2). Due to the spherical design, the diameters D of the dome-shaped recesses 3 are obtained different upward from the minimum diameter 4 of the torus to its maximum diameter 5.

Saturation of the surface of the torus 4 of the movable connection of the flanges of metal pipes with dome-shaped recesses 3 made in a rubber-fabric frame 2 dramatically increases the strength of the wall of the torus 4 of a traditional design without the use of reinforcing parts, since the dome is one of the most effective forms of thin-walled spatial structures. This makes it possible to simplify the design of the flexible armored sleeve and to exclude the hollow chamber.

Mobile connection flanges of metal pipes works as follows.

When supplying a working medium under pressure inside the toroidal shell 1 or applying a vacuum, the rubber-fabric frame 2, reinforced with dome-shaped recesses 3 of variable depth H and different diameters D, helps to maintain the cross section (round shape) of the movable connection of the flanges of the movable pipes due to the fact that each dome-shaped recess 3 when applying a working medium under pressure at the top, it experiences tensile stress, and near the base it experiences compressive stress. When working under vacuum, on the contrary, each dome of the dome-shaped recess 3 at the top experiences compressive stress, and near the base it experiences tensile stress. Since the domed recesses 3 are made of a single radius R of variable depth H and different diameters D in the direction of increase from the minimum diameter 4 of the torus to its maximum diameter 5, the domed recesses 3 in the zone of diameter 5 naturally become deeper and, accordingly, hold increased loads.

Thus, the proposed technical solution prevents the formation of additional axial forces on the pipes and thereby increases the reliability of the movable connection of the flanges of metal pipes, simplifies the design and manufacturing technology, and also reduces the consumption of materials.

Claims (2)

1. A movable connection of the flanges of metal pipes containing a toroidal shell made of rubber-fabric material, characterized in that along the torus of the shell, the dome-shaped recesses are made of variable depth and different diameter in the direction of increase from the minimum diameter of the shell torus to its maximum diameter. 2. The movable connection of the flanges of metal pipes according to claim 1, characterized in that the depth of the dome-shaped recesses is made within 0.3-1 of the internal radius of the dome-shaped recesses.

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