RU2488733C1 - Pipeline union - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: pipeline union comprises bushes with ledges rigidly secured at pipeline ends and resilient rings fitted between bushes. Flanges composed of two semi-rings are fitted on aforesaid bushes to displace thereon and to thrust against bush ledges and coupled by bolt joints. Pipelines are located by male-to-female joint. Bushes have cylindrical ledges that makes thrusts for flanges. End face of one of said bushes has groove to receive resilient ring. Flanges composed of two semi-rings are fitted on aforesaid bushes to center pipelines and semi-rings joint between themselves. Note here that semi-rings of one flange have groove at one end face while second flange semi-rings are furnished with tenon interacting with mortise. Semi-rings of one flange are turned relative semi-rings of another flange by spacing between bolt joints retaining pipeline flanges to make them sealed.

EFFECT: lower labour input in disassembly and replacement of worn-out parts.

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Description

The invention relates to the field of connecting pipelines and can find application in the design of connections of gas and oil pipelines, water pipelines and sewers.

Known flange connection of pipelines in accordance with GOST 12822-01 (steel flanges loose on the welded ring), containing rings, rigidly fixed at the ends of pipelines, flanges that move freely along the pipeline and tightened by bolted joints, the focus of which are welded rings.

Known flange connection of pipelines, adopted as a prototype, containing bushings with a lateral conical surface, rigidly fixed at the ends of the pipelines being connected, the ends of the bushings are interconnected by a protrusion-cavity, and an elastic ring is placed between them, while the lateral conical surfaces of the bushings are mated between by myself. Flanges are installed on the bushings with the possibility of free movement along them, with emphasis on the end protrusions of the bushings, pulled together by fasteners, moreover, on the inner surface of the flanged and associated end protrusions there are conical surfaces with an angle less than the friction angle for materials of flanges and bushings. The flanges are made in the form of half rings that are tightened together by bolted connections, and the axis of the connecting bolts are parallel to the tangent to the outer generatrix of the flanges (RF Patent No. 33203171, priority date 06/11/2003, publication date 10/10/2003, authors: Nosyrev D.Ya., Skachkova E.A., prototype).

A common disadvantage of the analogue and prototype is that the known pipeline connections do not allow dismantling and installation of a separate section of the pipeline without cutting the annular section of the pipe, which increases the complexity of dismantling and installation and requires special equipment for cutting and welding.

The objective of the invention is to reduce the complexity of operations when replacing worn sections of the pipeline.

To solve this problem, the connection of pipelines contains bushings with protrusions, rigidly fixed at the ends of the pipelines, an elastic ring installed between the bushings, flanges in the form of interconnected half rings, mounted on the bushings with the possibility of movement, abutted in the protrusions of the bushings and pulled together by bolted joints, centering means pipelines with a thorn-groove connection. What is new is that the bushings are made with a cylindrical protrusion forming an emphasis under the flanges, the end face of one of the bushings is provided with a groove in which an elastic ring is mounted. Flanges made in the form of half rings are mounted on the bushings with the possibility of centering pipelines and connecting the half rings to each other, while the half rings of one flange are made with a groove in the end face, the half rings of the second flange are equipped with a spike interacting with the groove, and the half rings of one flange are turned relative to the half rings of the other flange by a step of arrangement of bolted joints, tightening the flanges of the pipelines and ensuring the tightness of the connection.

Figure 1 shows the connection of pipelines, a longitudinal section, figure 2 - section aa in figure 1.

The pipe connection contains bushings 3 and 4, rigidly fixed on the connecting ends of the pipelines 1 and 2, on which are installed with a minimum clearance for movement, flanges 5 and 6, tightened by bolt joints 7. The bushings 3, 4 are made with cylindrical protrusions forming stops 8, 9 under the flanges 5, 6, provided with corresponding surfaces. On the end surface of one of the sleeves 3 or 4, an annular groove 10 is made, in which an elastic ring 11 is installed, which ensures the tightness of the connection. Flanges 5, 6 are made in the form of half rings, are mounted on bushings 3, 4 with the possibility of centering pipelines and connecting the half rings to each other. In this case, the half rings of one flange 5 are made with a groove 12 in the end face, the half rings of the second flange 6 are equipped with a spike 13 interacting with the groove 12, made with the dimensions corresponding to the groove and the outer surface of the bushings, providing a thorn-groove connection, and the half rings of one flange 5 are turned relative to the half rings of the other flange 6 per step of the location of the bolted joints 7, tightening the flanges 5, 6 of the pipelines 1, 2 and ensuring the tightness of the connection.

The connection of pipelines according to the proposed technical solution is performed as follows. An elastic ring 11 is installed in the groove 10 of the sleeve 3 and the end of one abutting pipe is brought to the other end of the pipe. Half rings of flanges 5 and 6 are mounted on rigidly fixed bushings 3 and 4, and half rings of flange 5 are turned relative to half rings of flange 6 by a spacing of bolted joints, for example, equal to an angle of 60 °. The centering of the joined pipes occurs due to the cylindrical groove 12 on the flange 5 and the cylindrical spike 13 on the flange 6. Then the flanges 5 and 6 are pulled together by bolted joints 7.

When uncoupling (dismantling) the pipelines, it is enough to unfasten the bolt connection 7, remove the half rings of the flanges 5 and 6 and dismantle the worn pipe using lifting equipment. When installing a separate section in the pipeline using lifting equipment, the pipe is installed in place of the dismantled one. A sealant is introduced into the gap between the bushings 3 and 4, after which the flanges 5 and 6, one of which is previously rotated by the location of the bolted joints 7, are bolted together until an elastic ring 11 is formed in the annular groove 10. Similar operations are performed on the opposite butt joint.

The advantages of the proposed technical solution are the lack of welding and the need to use special welding equipment for welding and cutting pipes both during installation and dismantling, which reduces the complexity of the technology for replacing a section of the pipeline.

Claims (1)

A pipe connection comprising sleeves with protrusions rigidly fixed at the ends of the pipelines, an elastic ring mounted between the sleeves, flanges in the form of interconnected half rings, mounted on the sleeves with the ability to move, abutted in the protrusions of the sleeves and pulled together by bolted connections, means of centering the pipelines with a connection like tenon groove, characterized in that the bushings are made with a cylindrical protrusion forming an emphasis under the flanges, the end face of one of the bushings is provided with a groove in which an elastic the ring, the flanges made in the form of half rings, are mounted on the bushings with the possibility of centering the pipelines and connecting the half rings to each other, while the half rings of one flange are made with a groove in the end face, the half rings of the second flange are equipped with a spike interacting with the groove, and the half rings of one flange are rotated relative to the half rings of the other flange per step of the location of bolted joints, tightening the flanges of the pipelines and ensuring the tightness of the connection.

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