RU2365806C1 - Connection of plastic shell with metal fitting - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention refers to the field of mechanical engineering and may be used in oil and gas industries in process of manufacturing pipes and reservoirs of composite materials for various applications. Connection of plastic shell with metal fitting is performed with ring projections on shelf between which continuous layers of fabric are laid. In spaces between ring projections, fabric layers are spiraled into rolls. Each next fabric layer overlaps previous layer and projections between which previous fabric layer is laid. All fabric layers are fixed by spiral or ring braids of composite material.

EFFECT: invention makes possible to improve connection reliability.

1 dwg

Description

The present invention relates to mechanical engineering and can be used in the oil and gas industries in the manufacture of pipes and containers for various purposes from composite materials.

Known for the design of a permanent connection of a plastic shell with a metal pipe (see application UK No. 1396119). The invention consists in the fact that a composite material forming a plastic shell is wound (laid) on a metal pipe. To increase the reliability of the connection of the plastic shell with the metal pipe, the latter has annular protrusions or troughs for which the shell wound around the pipe.

The disadvantage of the design is that the plastic shell in the area of the protrusions and troughs works for shear, which is unacceptable for layer-wound composite material. In addition, the need to ensure in most cases the cylindricality of the outer surface leads to the cutting of the reinforcing material, which significantly weakens the shell of composite materials.

The technical task of the invention is the creation of a permanent connection of the plastic shell with a metal pipe, which allows to increase the reliability of the connection of the plastic shell and to mechanize the process of its manufacture.

The technical result is achieved by the fact that in the junction of the plastic shell with a metal pipe made with annular protrusions on the shelf, between which continuous layers of fabric are formed that form the shell, in between the protrusions the layers of fabric are spirally folded into rolls, and each subsequent fabric layer overlaps the previous layer and annular protrusions, between which the previous layer of fabric is laid, all layers of fabric are fixed with spiral or ring bundles of composite material.

The drawing shows an inextricable connection of a plastic shell with a metal pipe.

The drawing shows the following positions:

1 - metal pipe;

2 - shelf;

3 - annular protrusions;

4 - layers of fabric;

5 - annular or spiral layers of a bundle of composite material.

The metal pipe 1 (see drawing) has several annular protrusions 3 on a shelf 2, between which layers of fabric 4 are laid, spirally rolled into rolls and secured by ring or spiral plaits 5 of composite material. When loading the shell (and the joint) with internal pressure, the layers of fabric 4, pinched between the annular protrusions 3, work in tension.

The listed set of features eliminates the need for mechanical processing of the plastic shell and ensures the operation of the fabric layers in tension, which increases the efficiency of the joint.

Claims (1)

The connection node of the plastic shell with a metal pipe made with annular protrusions on the shelf, between which continuous layers of fabric are laid, forming a shell, characterized in that in the spaces between the annular protrusions the fabric layers are helically folded into rolls, and each subsequent fabric layer overlaps the previous layer and protrusions, between which the previous layer of fabric is laid, all layers of fabric are fixed with spiral or circular bundles of composite material.