RU2352849C1 - Pipe installation device - Google Patents

Abstract

FIELD: engineering industry.

SUBSTANCE: invention refers to engineering industry, and is designed for constructing pipelines of plain pipes being damaged during welding, e.g. steel pipes with inner coating, or reinforced polymeric pipes. Pipe installation device consists of a metal casing made in the form of a cylinder with internal cylindrical cavity restricted with internal annular protrusion reaching the pipe outer surface, and cylindrical protrusion located on the casing external surface, a gasket seal installed in internal cylindrical cavity of the casing, bolts used as fasteners, and C-ring located in internal cylindrical cavity of the casing and made from material that is harder than pipe material. In the casing internal cylindrical cavity closed with an end cover plate on the side opposite to internal annular protrusion, there located is a movable bush that bears heavily with its inner conical surface on spherical protruding surface of C-ring, compresses it, at that presses pointed protrusions of C-ring into the pipe body, and fixes the pipe in the pipe installation device. To the opposite end of movable bush there adjoined is gasket seal the compression of which occurs during movement of the end cover plate when bolts entering the holes located in cylindrical protrusion of the casing and the end cover plate in axial direction uniformly in a circumferential direction are tightened.

EFFECT: improving connection reliability.

7 dwg

Description

The invention relates to mechanical engineering and is intended for use in the construction of pipelines from smooth pipes that are damaged during welding, for example, from steel pipes with an internal coating or reinforced polymer pipes.

The American company Great Plains Instrument INC proposed a device for connecting pipes (US patent No. 5004013), which contains a male hollow element with a threaded end and a retaining ring that secures the pipe inside the hollow element.

The pipe coupling developed by the Czechoslovak company Straub Federfabrik AG (RF patent No. 2045692) consists of a casing with radial end walls, which covers a C-shaped section of a sealing sleeve made of elastomer and through a lock with tightening screws located on the outer surface the coupling on one side is compressed in the circumferential direction and pressed against the pipe walls.

At the Ufa Petroleum Institute (AS USSR No. 1733819 dated 05/15/92) a "Device for connecting plastic pipes with metal pipes and fittings" was developed. In the aforementioned device, to increase reliability, a detachable flange (composed of three parts) is used, fixed to a plastic pipe using standard fasteners. The flange is equipped with an annular protrusion acting on the surface of the plastic pipe. A sleeve with an annular cavity is installed inside the pipe, in which the seals are located - elastic rings ensuring the tightness of the joint. Before installation, the pipe section is heated to t ° - 60-70 ° C, and in such a plastic state is pressed by the annular protrusion of the flange into the annular cavity of the sleeve installed inside the pipe. In order to prevent the plastic fibers from cutting off, a hyperbolic cross section is given to the hollow in the sleeve and the curvature of the flange protrusion.

At the Saratov State Technical University (SSTU) a “Device for connecting plastic pipes with metal and fittings” (RF patent No. 2303189) has been developed, which contains a metal flange with an annular protrusion covering the pipe from the outside and placed inside the pipe fastening mechanism and a sealant to seal the joint, the flange further comprises a concentrically arranged annular protrusion, which is in contact with the inner surface of the pipe, pre-machined to the desired size. The sealant for sealing the joint is made in the form of a gasket placed on the end of the pipe and is compressed by an external force, without removing which the fastening mechanism is activated, consisting of a cylindrical part in the form of a sleeve with slots forming deformable petals. The annular protrusion of the flange is rigidly fastened to the sleeve with slots through a series of screws, the cylindrical parts of which are inserted into the smooth holes of the sleeve. Parallel to this row of screws, a second row of screws is placed, acting on the deformable petals of the sleeve, which are embedded in the pipe body.

As a prototype of the proposed solution, it is advisable to consider the “Coupling for connecting smooth pipes” developed by the Saratov State Technical University (RF patent No. 2298718). The metal casing enclosing the pipes is made in the form of a cylinder with internal grooves bounded by an annular protrusion reaching the outer surface of the connected pipes. In the internal grooves there are mechanisms for sealing the connection and fastening the pipes. Four cylindrical protrusions are made on the outer surface of the body, two of which are designed to accommodate radially spaced two rows of screws, one of which acts on the joint sealing mechanism through the C-shaped and pressure rings, and the other on the pipe fixing mechanism. The structure of the sealing mechanism of the connection includes pressure rings acting when they are displaced along the axis of the pipe on the sealing gasket. The pipe fixing mechanism is the cylindrical sleeve petals placed evenly around the circumference, having sharp protrusions on the surface facing the pipe, and penetrating the pipe surface when tightening the screws. When applying the proposed coupling to polymer pipes, an additional retaining sleeve, which is a metal cylindrical insert, is inserted inside the ends of the pipes to be joined.

Among the disadvantages that impede the mass use of this coupling are the rather complicated design of both the coupling itself and the components included in it, the presence of two rows of screws, the restriction of the movement of the sealing mechanisms of the connection and the fixing of the pipe to the dimensions of the coupling body.

The objective of the invention is the creation of a universal device with a simpler design without compromising reliability, providing various options for installing pipes, in particular, connecting smooth pipes of one or different diameters to each other, as well as with fittings, installing plugs, and the pipes can be made of materials damaged during welding, which should ensure the conditions for its mass use.

The problem is solved due to the fact that in the device for mounting pipes containing a metal housing made in the form of a cylinder with an inner cylindrical groove bounded by an inner annular protrusion reaching the outer surface of the pipe, also having a cylindrical protrusion made on the outer surface of the housing, a sealing gasket installed in the inner cylindrical groove of the body, fasteners in the form of bolts, C-ring located in the inner cylindrical groove orpusa made of a harder material than the material of the tube and having on the outer surface of the spherical projecting portion, and the inner surface - the pointed radial projections, wherein the C-ring is used to secure the tube. When the pipe is fixed, the C-ring located inside the metal casing is pressed by the side surface to the inner annular protrusion, and the movable sleeve acts on its external conical surface by the conical surface, which compresses the C-ring and the pointed radial protrusions on the inner the surfaces of the C-shaped ring are pressed into the pipe body, reliably securing the pipe mounting device. A sealing gasket is adjacent to the end of the movable sleeve opposite the conical surface. The force that compresses the sealing gasket between the movable sleeve, the end cap, the outer surface of the pipe and the surface of the inner cylindrical groove is carried out by moving the end cap when tightening the bolts that enter the holes located in the cylindrical protrusion of the body and the end cap in the axial direction uniformly around the circumference.

A device for mounting pipes can be used to create a coupling for connecting pipes of the same or different diameters, a flange for connecting pipes or connecting them to fittings, plugs for pipes and in other similar cases.

When using the device for mounting pipes to polymer pipes, a thrust sleeve is additionally inserted into the end of the pipe, which is a metal cylindrical insert that reinforces the rigidity of the structure due to the perception of most of the loads acting on the end of the polymer pipe from the compression of the C-shaped ring when the pipe is fixed.

The invention is illustrated by drawings.

Figure 1 shows a cross section of a quarter of the device for mounting pipes.

Figure 2 in section of a device for mounting pipes depicts a metal retaining sleeve used when connecting polymer pipes.

Figure 3 shows a cross section of a C-shaped ring.

Figure 4 shows a cross section of a quarter of the device for mounting pipes, namely the coupling for connecting pipes of different diameters (example 1 application of the device for mounting pipes).

Figure 5 shows a cross section of a quarter of the device for mounting pipes, namely the coupling for connecting pipes of the same diameter.

Figure 6 shows a cross section of a quarter of a device for mounting pipes, namely a flange for mounting pipes.

7 shows a cross section of a quarter of the device for mounting pipes, namely plugs for pipes.

A device for mounting pipes (see figure 1) contains a metal casing 1, made in the form of a cylinder, with an inner cylindrical groove 2, which is limited by an inner annular protrusion 3, reaching the outer surface of the pipe. A cylindrical protrusion 4 is made on the outer surface of the metal housing 1 at its end 4. For securing the pipe, a C-shaped ring 7 located in the inner cylindrical groove 2 of the metal housing 1 is used, while the pipe is securing, the side surface is pressed against the inner annular protrusion 3. On the outer protruding surface 17 of the C-shaped ring 7 acts on its inner conical surface of the movable sleeve 8, which compresses the C-shaped ring 7 and the pointed radial protrusions 13 (see figure 3), they yuschiesya on the inner surface of the C-shaped ring 7 are pushed into the body tube securely fixing device for mounting pipes. A sealing gasket 9 is adjacent to the end of the movable sleeve 8, opposite the conical surface. The force acting on the sealing gasket 9 and the C-ring 7 is carried out by moving the mechanical cap 10 when tightening the fasteners in the form of bolts 5 with nuts 6 included in the holes, located in the cylindrical protrusion 4 and the end cap 10 in the axial direction evenly around the circumference.

The device for mounting polymer pipes is additionally equipped with a retaining sleeve 11, equipped with an annular protrusion 12 in the middle part (see figure 2). The supporting sleeve 11, which is a metal cylindrical insert with an annular protrusion 12, ensures the preservation of the shape of the polymer pipe under conditions of significant external loads acting on the end of the polymer pipe from compression of the C-shaped ring 7 when fixing the pipe.

The device for mounting pipes is mounted as follows.

At the place of constant operation, it is supplied assembled (see figure 1). The bolts 5 are inserted into the holes for the fasteners located in the cylindrical protrusion 4 and the end cap 10, and baited onto the nuts 6. Push the device for mounting pipes on the end of the pipe. They begin to tighten the bolts 5, which leads to the movement of the end cap 10 in the axial direction. The tightening force compresses the sealing gasket 9 and then transferred to the movable sleeve 8, which compresses the C-shaped ring 7 with its inner conical surface and the pointed radial protrusions 13 located on the inner surface of the C-shaped ring 7 are pressed into the pipe body, reliably securing the device for pipe connections. After the final tightening, the sealing gasket 9 is compressed in a closed volume, that is, it becomes practically incompressible.

The practical application of the device for mounting pipes can be found, for example, in the following designs.

Example 1 - a coupling for connecting pipes of different diameters (see figure 4), which is two devices for mounting pipes, the casing of which is connected as a whole using a transition sleeve 14 by welding or made as a single whole stepped cylinder.

Example 2 - a coupling for connecting pipes of the same diameters (see figure 5), which is two devices for mounting pipes, the shells of which are connected into a single unit by welding or made in the form of a single cylinder.

Example 3 - a flange for connecting pipes or connecting them to fittings (see Fig.6), which is a metal flange 15, attached to the housing of the device for mounting pipes by welding or made in a single unit with it.

Example 4 - a plug for the pipe (see Fig.7), which is a round metal cover 16 attached to the body of the device for mounting pipes by welding or made as a whole with it.

In all of the above designs, the gasket 9 protects the C-ring 7 from external influences.

The advantages of the proposed technical solution include:

- ease of installation operations associated with tightening the bolts according to the recommendations for mounting flange joints;

- the completeness of protection of the internal elements of the device for connecting pipes from corrosion;

- unification of various types of pipe joints;

- relatively small dimensions of the device for connecting pipes.

Claims (1)

A device for mounting pipes containing a metal housing made in the form of a cylinder with an inner cylindrical groove bounded by an inner annular protrusion reaching the outer surface of the pipe and a cylindrical protrusion located on the outer surface of the housing, a sealing gasket installed in the inner cylindrical groove of the housing, fasteners in the form of bolts, a C-shaped ring located in the inner cylindrical groove of the housing, characterized in that the C-shaped ring is made o of a harder material than the pipe material, the side surface is pressed against the inner annular protrusion of the metal casing and has a spherical protruding part on the outer surface, and on the inner surface are pointed radial protrusions, the inner cylindrical groove of the casing from the side opposite the inner annular protrusion is closed by the end lid, in the inner cylindrical groove of the housing is a movable sleeve, which with its inner conical surface presses on a spherical The protruding surface of the C-shaped ring compresses it, while it presses pointed radial protrusions into the pipe body and secures the pipe in the pipe mounting device, and a sealing gasket is adjacent to the opposite end of the movable sleeve, the compression of which is between the movable sleeve, the end cap, and the outer surface of the pipe and the surface of the inner cylindrical groove occurs when moving the end cap when tightening the bolts entering the holes located in the cylindrical protrusion of the housing and the end cap axially uniformly around the circumference.

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