RU2099625C1 - Detachable joint for connection of thin-walled pipes - Google Patents

Abstract

FIELD: pipe line transport for liquid corrosive media; steel tubes provided with anticorrosive coats. SUBSTANCE: detachable joint includes threaded sleeve, clamping rings with threads and solid circular gaskets pressed towards each other by clamping rings. It is provided with safety washers. Inner surface of sleeve is provided with thrust bead located between thin-walled pipes. Safety washers are located on side of clamping rings and are engageable with circular solid gaskets. EFFECT: enhanced reliability. 2 cl, 2 dwg

Description

 The invention relates to the field of pipeline transport, primarily for liquid corrosive environments, as well as to the connection of steel pipes with anticorrosive coatings.

 Known devices and methods for connecting pipes cannot be implemented for thin-walled pipes without threads with anti-corrosion coating.

 The closest in technical essence and the achieved result is "Plastic coupling for connecting smooth (glass) pipes", which is a detachable connection containing a coupling with a thread, two coupling rings with threads and gaskets.

The disadvantages of this solution is the limitation of the possibility of using the connection only at small (less than 4-6 kgf / cm ² ) excessive pressures of the transported medium due to deformation of the gaskets during coupler coupling and the coupling ring.

The proposed technical solution solves the problem of connecting thin-walled pipes with an anti-corrosion coating, operating at a pressure of the transported medium up to 16 kgf / cm ² or more, without deformation of the ends of the pipes.

 The problem is solved due to the fact that in a detachable device for connecting thin-walled pipes, including a threaded sleeve, compression rings with threads and annular solid gaskets, pressed by the compression rings towards each other, according to the invention it is equipped with safety washers, and on the inner surface of the coupling a thrust collar located between thin-walled pipes, and the safety washers are located on the side of the coupling rings and are interfaced with ring solid gaskets.

 In addition, the inner surface of the coupling is made with a tread coating.

 The scheme of the proposed device for connecting thin-walled pipes is presented in figure 1 (for connecting pipes of the same size) and in figure 2 - for connecting pipes of different sizes.

 A detachable device for connecting pipes (Figs. 1 and 2) consists of a coupling 1 with a stop collar 2, coupling rings 3, safety metal washers 4 and ring gaskets 5.

 The detachable device is assembled as follows. On the pipe 6 put on a coupling ring 3, a safety washer 4 and an annular solid gasket (one or several) 5. The end of the pipe is set into the coupling 1 until it stops (to the stop shoulder 2), the ring gasket 5 and the safety metal washer 4 are pushed to the coupling what is the purpose of screwing the coupling ring 3 onto the coupling 1. Due to the fact that the safety washer 4 pushes the ring gasket 5 first without its deformation and then with some deformation (without twisting the ring gasket 5), the shape of the safety washer 4 os a tight connection is established. The coupling 1 and the coupling rings 3 can be made in the form of nuts for tightening with a key. In the same way, a second pipe 6 is inserted into the sleeve 1 and sealing is carried out.

 The proposed device for connecting pipes is tested on electric-welded pipes of size 10x1 mm with a double-sided aluminum-zinc coating. Fluoroplastic, polyethylene and thin paronite gaskets of different thicknesses were tested as ring gaskets.

 Safety washers were made of steel with an angle of 65 to 75 degrees. (Fig. 1). The proposed connection can be used for pipes with diameters of 50-150 mm with a fluoroplastic or hot zinc coating of the inner surface.

 The elements of the detachable device for connecting the pipes can be performed with a tread coating mainly of hot zinc by them with an aluminum-zinc alloy containing 55% aluminum. These tread coatings are most versatile for water of various compositions and aqueous solutions.

Using the proposed solution allows you to:
to ensure the connection of thin-walled pipes that can not withstand welding, without coating and with an anti-corrosion coating, which makes it possible to reduce the metal consumption of systems;
to ensure the connection of pipes without threads at their ends, which allows to produce pipes with smooth ends directly at the installation site (including on the track) by simple cutting (hacksaw, emery wheel);
to ensure the installation of the pipeline in narrow places (in shallow recesses of hidden wiring in the walls, in trenches) when wrenches are used on one side;
to provide connections of pipes of different sizes, with increased ovality, with unremoved burr;
join galvanized pipes without damaging the coating.

Claims (2)

 1. A detachable device for connecting thin-walled pipes, including a threaded sleeve, compression rings with threads and annular solid gaskets, pushed against the other by compression rings, characterized in that it is equipped with safety washers, and on the inner surface of the coupling there is a thrust collar located between thin-walled pipes, and the safety washers are located on the side of the coupling rings and are interfaced with ring solid gaskets.  2. The device according to claim 1, characterized in that the inner surface of the coupling is made with a tread coating.

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