SU1237862A1 - Flexible pipe - Google Patents

Description

The invention relates to pipe fittings and can be used in the petroleum, coal, chemical and other industries.

The purpose of the invention is to reduce the flexural rigidity of the pipe by cutting paint, sealing the chamber, and reducing the load on the non-flexible components.

FIG. 1 shows a flexible pipe, spreading over layers, a general view; in fig. 2 - the same. cross section; in fig. 3 - the same at the time of manufacture and in working condition; in fig. 4 - the same, in a non-working state; pas figs. 5 - spiral frame (in this case in the diameter - rectangular section).

The flexible tube consists of an inner hermetic chamber 1, the outer surface of which has an elastic support shoulder 2 and a helical groove 3 under the spiral frame 4. The snail framework 4 has transverse grooves 5 for passing and fixing the load-carrying elements 6 fixed in the grooves 5 through certain distance, in order to increase the tractive strength and reliability of the pipe in the working state and decrease the flexural rigidity during winding. The grooves 7 under the load- 1cc elements from above are sealed with durable elastic material 8 with the formation of the load-bearing elements in the gap 9 in a non-working state 9. During the manufacture of the pipe or in the working state, the internal sealing chamber 1 is elongated, the reducing elements 6 are tensioned and a lower gap 10 is formed. After fixing the weight-bearing elements 6 in the grooves 5 and coating the surfaces (a) with a plastic polymer shell 11 to the upper part of the spiral frame 4, for example, on (: cooking 12, one of the protrusions The second element in the form of a tape 13 is represented in cross section by two oppositely directed protrusions 14, formed in the middle of the profile by a support shoulder 15 and a slanted threshold 16. Moreover, the protrusion 14 of the tape 13 not attached to the spiral frame 4 has a bevel 17 forming during winding of the tape 13 with a bevelled threshold 16 of the helical direction of the groove 18 under the projections of the nut (not shown).

In the manufacture of a flexible pipe, the screw directions of the load-bearing elements and the siiral frame are directed to opposite sides with certain angles, (and Jb relative to the axis of the pipe, sufficient to allow the case of screw-lift from standard hoists and securely protected from external and internal loads.

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The arrows A in FIG. 3 shows the direction of the hook of the grooves in the manufacture of a flexible pipe by a durable elastic material.

Arrows B in FIG. Figure 3 shows the stretching of the internal sealing chamber at the time of the manufacture of the pipe and in the operating state.

The curly bracket in FIG. 3 shows the surface of the application of the protective polymer shell.

The flexible tube works in the following manner.

In the non-operating state, the internal hermetizing chamber 1 is in an unstressed state and the load-carrying elements 6 are in a free state in the slots 7, and the pipe is freely wound onto the drum.

At this time, the working protrusions of the nut enter the screw guide groove 18 formed by the tape 13, and form with both the protrusions 14 of the tape 13, the spiral frame 4, the load-carrying elements 6 and the internal hermetic marking chamber 1 hard screw contact. The pipe section under 1 Ika is influenced by the weight of the pipe and the downhole motor, when this force grows without the internal sealing chamber 1 until a working stress state is created, the free-form elements 6 in the grooves 7 between the sections of the spiral frame 4 are stretched Nuts and take on the load. All of these elements will be in elastic grip among themselves.

Flexible pipe can be made as follows.

Special traction is given by the axial tension of the hermetic camera chamber, this movement temporarily on the inside

the internal mechanism of the internal providing at the last. Single sealing

chamber I winds the spiral frame 4 and load-carrying elements 6, rigidly fixed in the spiral frame 4. When unloaded, the internal sealing chamber 1 is reduced and the load-carrying elements of the b are relaxed in the gap. The grooves 7 are vulcanized or poured with a durable elastic material 8. Next, the coating is covered with a laminated polymeric sheet with a point 11 and wound with simultaneous fastening to the spiral frame 4 of the tape 13.

Flexural rigidity of the flexible pipe is relieved by reducing the wall of the flexible pipe and increasing the distance between the turns of the spiral frame 4. At the same time, fastening it with the load-carrying elements 6 and tape 13 provides elasticity | si capture and perception of axial and radial loads.

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Compiled by D. Androsov

Editor N. Kishtulintstehred I. VeresKorrektor M. Samborska

Order 3273/39 Circulation 880 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (2)

1. FLEXIBLE TUBE containing an internal sealing chamber with grooves for load-bearing elements, a spiral frame and a protective polymer shell, characterized in that, in order to reduce bending stiffness, it is equipped with a reinforcing element in the form of a tape having protrusions mounted on the outer surface of the spiral the frame by rigidly fixing one of its protrusions with a subsequent turn that is blocked during winding, and on the outer surface of the inner sealing chamber an elastic support collar is made and constant prices grooves oppositely the load-bearing elements with a helical screw groove frame which is provided with said grooves aligned transverse bores in which the fixed load-bearing elements with a clearance, the top grooves embedded elastic material. 2. The pipe in π. 1, characterized in that the tape is made oppositely directed support collar and beveled threshold, forming a helical groove. 1237862 A1