RU2538196C1 - Pipeline connection - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: connection includes a housing with an internal annular projection, in an axial channel of which a tip with an annular piston installed inside an annular chamber is installed. The annular chamber is formed with an internal annular projection of the housing and a connection element with a flange on the end with its separation into balancing and load-carrying chambers that are connected with radial holes in the housing body to atmosphere and in the tip body with its axial channel. The tip is equipped with a bearing arranged in the housing bore so that it is supported from its annular projection pressed to it with a nut connected to the housing internal thread. The tip is equipped with a connection element with a flange on the end, on which there is a thread and a lock nut is installed with a possibility of face contact to the nut. Annular gaps are covered with sealing rings. At installation of the device as a part of a pipeline, the lock nut is screwed as much as possible onto the connection element, and the tip is introduced as much as possible into the axial channel of the housing with reduction of a distance between the flanges.

EFFECT: unrestricted introduction of a device between the mating flanges of a pipeline; improving the device operating reliability.

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Description

The invention relates to mechanical engineering and can be used to provide a movable connection of sections of the pipeline to each other, including in the armature of oil and gas wells.

Known swivel pipe connection [US Pat. RF No. 2216675], consisting of a male clip with a stepped mating surface and a protrusion, which is located at the level of connection of the ends of the male clip and the connecting element. The sealing element consists of a gasket and cuff, made at the same time.

The gasket is in the form of a sleeve and with its inner surface mounted on a ledge with its coverage.

As a connecting element, flanges are used. The clip and the clasped clip are provided with annular grooves in which rotary elements in the form of rolling bodies are placed.

The disadvantages of the design include:

1. The excess pressure drop, perceived by the cross-sectional area of the covered cage and the sealing element, is communicated to the rolling elements, which with sufficiently large diametrical dimensions of the pipelines can reach high values.

2. The installation of a swivel joint in a section of an existing pipeline is difficult due to the fact that the sections of the mating pipeline must be separated from each other in the axial direction to establish the proposed connection; in addition, it is necessary to separate them at a sufficiently large distance to ensure the dismantling and re-installation of the sealing element. It is quite difficult to make this operation; it requires the expenditure of working time and the use of a special installation tool. Known swivel pipe connection [US Pat. RF No. 2011102], consisting of a fitting with a groove installed in the housing, in which a radial bore is made, which together with the groove forms a cavity for accommodating the balls. The body boring is covered by a washer, pressed in by a foot and provided with a seal and two L-shaped cuffs. A spacer ring is mounted on the cuff petals. A slot is made at the end of the other cuff.

The cuffs are made of a material with a low coefficient of friction, which, when the nozzle rotates relative to the foot, requires little effort. When applying pressure, an axial load arises, acting on the fitting and the housing, which is perceived by the balls and holds the fitting inside the housing.

The disadvantages of the design include:

1. The complexity of mounting and dismounting the device directly at the place of use.

2. The design has a high hydraulic resistance.

3. Dismantling the balls and replacing worn cuffs requires removal from the installation site of the housing and its axial movement towards the nozzle over a sufficiently large distance, which increases the dimensions of the structure and installation conditions.

The connection of pipelines is known [A.S. USSR No. 585363], consisting of external and internal pipelines, on one of which flanges are made, with the formation of a groove between them, in which a cuff with spring rings of external and internal pressure is placed. Between the flanges there is also a spring ring with a clamp to the inner surface of the outer pipe.

The connection allows assembly with significant skew between the pipelines.

After assembling the connection, the ends of the pipelines are fastened to each other by various fasteners.

The disadvantages of the design include:

1. With the existing pipeline, in which this connection is included, there are conditions when it is necessary to replace a failed cuff. In this case, it is necessary to separate the outer and inner pipelines in the axial direction, which is impossible without an axial compensator as part of one of the pipelines.

2. It is also problematic to connect the two pipelines to each other, for example, using bolts or a fitting with a nut, since it is difficult to ensure their interface. Excessive pressure perceived by the seal also acts on sections of pipelines. With a large overpressure, when the seal has large diametric dimensions, due to its design features, it can quickly fail.

Known rotary connection of high pressure pipelines [A.S. USSR No. 149284], adopted by the authors for a prototype consisting of a housing, in the bore of which a bearing assembly is placed, covering the tip with a protrusion (thrust shoulder) provided with a seal. The bearings are tightened by a nut mounted on the outside of the housing, locked with another nut.

The housing is threaded for mounting a connecting unit, for example a square. The tip is also equipped with a connecting node - a square.

Connection work

Thanks to the bearing assembly, the coupling assembly on the housing and the coupling assembly on the tip can rotate freely relative to each other. The pressure drop from the working fluid is perceived by the seal on the protrusion of the tip and axial reinforcement is communicated to the bearing assembly, which can reach high values at high pressures of the working fluid.

The disadvantages of the design include:

1. The presence of large axial reinforcement on bearings;

2. The inability to change the distance between the connecting nodes to facilitate installation in a limited space.

The technical result that can be obtained by implementing the invention:

1. The ability to install the device in the pipeline between its sections without the use of special technical means;

2. The ability to change the position of the flanges at the ends of the device for combining holes with mating flanges at the ends of the mating sections of the pipeline;

3. The exception of the transmission of axial load from the pressure drop from the working fluid to the bearing unit;

4. The ability to rigidly fix the position of the parts of the device after installation between sections of the pipeline.

The technical result is achieved in that the connection of the pipeline consists of a housing with an annular protrusion, a tip in its axial channel, with bearings, connecting elements associated with the housing and the tip, nuts and lock nuts, and sealing elements.

The tip is equipped with an annular piston, forming a movable connection with the housing, in which an annular chamber is formed, divided by an annular piston into equalizing and power, which are respectively connected with the atmosphere and the axial channel of the tip by radial holes. The bearing is mounted with support on the annular protrusion of the housing and is preloaded by a nut mounted on the internal thread of the housing. Moreover, the lock nut is mounted on a thread made on the outer surface of the connecting element, with the possibility of axial movement and mechanical contact with the nut.

The cross-sectional area of the tip is taken equal to the area of the annular piston.

The design of the piping connection is illustrated by drawings, where:

1) in Fig.1, the design of the device in the context in the ready position for installation in the pipeline;

2) in Fig.2, the design of the device in the context in the installation position (installation) in the composition of the pipeline, with the fixation of this position for the period of operation.

The device consists of a housing 1 with an internal annular protrusion 2, in the axial channel of which there is a tip 3 with an annular piston 4 mounted in an annular chamber 5 formed by an annular protrusion 2 and the end face of a connecting element 6 provided with a flange 7. In the housing 1, a bearing 8 with resting on its inner annular protrusion 2, tightened by the nut 9.

A thread is made at the end of the tip 3 and a connecting element 10 provided with a flange 11 is installed. A thread 12 is made on the outer surface of the connecting element 10 and a lock nut 13 is installed. 16 in the body of the housing 1 with the atmosphere, and a radial hole 17 in the body of the tip 3 with its axial channel 18. The diametrical dimensions of the annular piston 4 are taken from the condition of equality of its cross-sectional area the cross-sectional area of the tip 3.

The annular gap between the tip 3 and the connecting element 6 is closed by the seal 19. The annular gap between the annular piston 4 and the housing 1 is closed by the seal 20. The annular gap between the inner annular protrusion 2 and the tip 3 is closed by the seal 21.

Installation and operation of the pipeline connection

The complete assembly is delivered to the place of application, where the lock nut 13 is completely screwed onto the external thread 12 on the connecting element 10, which allows the tip 3 to be moved in the axial direction, thereby changing the distance between the flanges 7 and 11. This allows you to freely place the connection between the mating flanges at the ends of the pipeline. Since the tip 3 can freely rotate with the connecting element 10 and the flange 11 relative to the housing 1, this allows you to provide and simplify the alignment of the holes on the mating flanges. Combine the flanges 7 and 11 with the corresponding flanges at the ends of the pipeline with their screed with studs (not shown).

The annular piston 4 thus occupies an intermediate position inside the annular chamber 5.

By rotation of the lock nut 13 on the connecting element 10, this position is fixed by locking the nut 9 connected to the housing 1 to the end face.

In this position, the working fluid is supplied under pressure into the axial channel 18 of the tip 3. Since the cross-sectional area of the annular piston 4 is equal to the cross-sectional area of the tip 3, there is no axial loading of the flange 11 and the bearing 8.

If it is necessary to dismantle the connections, the flanges 7 and 11 are disconnected from the corresponding flanges at the ends of the pipeline.

After that, the locking nut 13 is rotated on the thread 12 of the connecting element 10, which allows the tip 3 to be shifted in the axial direction with a decrease in the distance between the flanges 7 and 11, which contributes to the free withdrawal of the device from the pipeline.

Claims (1)

Pipeline connection, including a housing, a tip, a bearing, a nut, a lock nut, connecting elements, seals, characterized in that the tip is equipped with an annular piston forming a movable connection with the housing, equipped with an inner annular protrusion, forming with the tip an annular chamber divided by an annular piston into equalization and power chambers, which are respectively associated with the atmosphere and the internal cavity of the tip by radial holes in the body and tip; the bearing is supported by an annular protrusion and preloaded by a nut mounted on the internal thread of the housing, the lock nut being mounted on the thread of the outer surface of the connecting element with the possibility of axial movement and mechanical contact with the nut, and the cross-sectional area of the tip is taken equal to the area of the annular piston.

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