RU85976U1 - TRANSITIONAL, ONE-PART, COUPLING CONNECTION OF PLASTIC-METAL PIPES - Google Patents

Abstract

1. Transitional, one-piece, sleeve connection of pipes "Plastic-Metal" containing nozzles of metal and plastic pipes, as well as a seal, characterized in that the nozzles are connected by an integral connection by a metal coupling, the length of which is greater than the length of the contact of the nozzles with each other, and between the end of the nozzle of the plastic pipe and the outer surface of the nozzle of the metal pipe and the inner surface of the metal coupling is placed a seal of elastic material. ! 2. The compound according to claim 1, characterized in that the metal sleeve is made in the form of a socket, in which a pipe from a plastic pipe is installed. ! 3. The connection according to claims 1 and 2, characterized in that the contact surfaces of the nozzles of plastic and metal pipes are connected by an adhesive joint.

Description

The utility model relates to the field of pipeline transport and can be used in the construction of pipelines for attaching a plastic pipeline to a metal pipeline or to valves.

A known structure for connecting a polyethylene pipe to steel, made by the method of connecting a polyethylene pipe to steel (as USSR USSR No. 1760228 class. F16L 47/06), where the metal pipe is connected to the socket of the plastic pipe using adhesive, and the plastic pipe opposite the socket connection reinforced with a plastic sleeve.

The disadvantage of this compound is that the reliability is ensured only by the adhesive, which weakens over time and, especially when the temperature drops, since the coefficients of thermal linear expansion of plastics are 20-50 times higher than that of metals, and, in particular, with a large wall thickness of the plastic pipes, the adhesive connection between the plastic pipe and the steel will break.

It is also known to connect metal and plastic pipelines, consisting of coaxial metal and plastic pipes and an elastic seal, where at least four grooves are arranged in the body of the metal pipe located in mutually perpendicular planes, and at least four shoulders are made on the surface of the plastic pipe, each of which located on a helix (USSR AS No. 1560883, Cl. F16L 37/00).

This connection design is detachable, where the strength of the connection is ensured only by the collars on the plastic pipe, and the tightness is due to the elastic seal, which is clamped only between the end surfaces of the pipelines, that is, the connection strength is very low for high pressure pipelines, where large axial forces and collars in a plastic pipe cannot withstand axial loads, since their cross section is very small, the elastic seal is not in an enclosed space, therefore, when you squeeze will be displaced. The displacement of the elastic seal can also occur due to the transported medium penetrating through the screw connection, which in no way can be tight due to the fact that the collars of the plastic pipe under the action of axial load will flow. In addition, under the influence of vibrations arising during the operation of the pipeline, the screw connection will begin to unscrew, that is, the very low reliability of this connection, but it is also difficult to manufacture, requiring a certain accuracy in manufacturing.

The objective of the utility model is to increase the reliability of the connection in transitions from a plastic pipeline to a metal pipeline.

The task is achieved by the fact that in the transitional, one-piece, sleeve connection of pipes “Plastic-Metal”, containing pipes from metal and plastic pipes, as well as the seal, where it is new, that the pipes are connected by a one-piece connection by a sleeve, the length of which is longer than the contact length branch pipes among themselves. New is that the metal coupling is made in the form of a socket, in which a pipe from a plastic pipe is installed. It is new that between the end of the nozzle of the plastic pipe and the outer surface of the nozzle of the metal pipe and the inner surface of the metal coupling is placed a seal of elastic material. New is that the contact surfaces of the nozzles of plastic and metal pipes are connected by an adhesive joint.

All this allows to increase the reliability of the transitional, one-piece, sleeve connection of the Plastic-Metal pipes.

In FIG. The proposed design of the transitional, integral, sleeve connection of the Plastic-Metal pipes is presented. The transitional, one-piece, pipe-to-pipe coupling “Plastic-Metal” includes a pipe 1 from a plastic pipe having a socket 2, to which a pipe 3 from a metal pipe is connected, and from the outside they are connected by a metal sleeve 4, an elastic seal 5 is placed in a closed space, on contact Sealant applied 6.

Transitional, one-piece, sleeve connection of pipes "Plastic-Metal" is made as follows. A socket 2 is made in a pipe 1 from a plastic pipe, in which a pipe 3 is pressed into a metal pipe with a sealant 6 applied, and on the outside 3 a flexible seal 5 is put on until it stops with the end of the pipe 2, a sleeve 4 is installed on the connection obtained, which is crimped by reduction with the help of a hydraulic press equipped with a die, first over the entire surface, and then at a large value at its ends. As a result, between the contacting surfaces of the nozzles 1 and 3 and the coupling 4, a friction connection is formed, and one end of the nozzle 1 is pinched between one of the ends of the outer surface of the nozzle 3 and the middle part of the inner surface of the metal coupling 4. At the same time, the nozzle 1 is pinched between the received the cone of the socket of the sleeve 4 and the conical part of the end of the pipe 3. The elastic seal 5 remains clamped in a closed space formed by the end of the pipe 1, the outer surface of the pipe 3 and the inner surface of the coupling 4.

The resulting transitional, one-piece, sleeve-joint connection of Plastic-Metal pipes has high reliability in terms of tightness and, in particular, in strength, where the pipe 1 from a plastic pipe is connected to the pipe 3 from a metal pipe and the metal sleeve 4 is a friction joint with simultaneous pinching of one of the ends pipe 1 from a plastic pipe between one of the ends of pipe 3 from a metal pipe and the middle part of the inner surface of the metal coupling 4. The tightness is ensured by friction with a union between the contacting surfaces of the pipes 1 and 3 and the metal sleeve 4 and the elastic seal 5 and sealant 6.

This design of the transitional, one-piece, sleeve connection of the Plastic-Metal pipes allows them to be used in the construction of pipelines from plastic pipes for which they are designed, when it becomes necessary to connect them to a metal pipe or with valves.

References

1. A.S. USSR No. 1560883 IPC F16L 137/00. Connection of metal and plastic pipelines / G.A. Khromova et al. - No. 4441318 / 25-29. Announced June 15, 1988 04/30/1990. Bull. No. 16.

2. A.S. USSR №1760228 IPC F16L 47/06. The method of connecting a polyethylene pipe to steel / B.F. Vindt, L.I. Pyak and I.V. Sbarsky. - No. 4892833/29. Declared December 20, 1990 Publ. 09/07/1992. Bull. No. 33.

Claims (3)

1. Transitional, one-piece, sleeve connection of pipes "Plastic-Metal" containing nozzles of metal and plastic pipes, as well as a seal, characterized in that the nozzles are connected by an integral connection by a metal coupling, the length of which is greater than the length of the contact of the nozzles with each other, and between the end of the nozzle of the plastic pipe and the outer surface of the nozzle of the metal pipe and the inner surface of the metal coupling is placed a seal of elastic material. 2. The compound according to claim 1, characterized in that the metal sleeve is made in the form of a socket, in which a pipe from a plastic pipe is installed. 3. The connection according to claims 1 and 2, characterized in that the contact surfaces of the nozzles of plastic and metal pipes are connected by an adhesive joint.