RU5009U1 - TUBULAR FLEXIBLE ELEMENT - Google Patents

Abstract

1. A tubular flexible element formed by cross layers of fibrous material with a partial coverage of the end fittings and having protrusions along the outer profile containing surfaces of positive and negative curvature, characterized in that the surfaces of negative curvature are in the form of a single-cavity hyperboloid of revolution, and the fibrous material is made of continuous bundles and / or filaments or tapes of them with a variable reinforcement angle lying within the limits where Φ is the angle of reinforcement of the fibrous material; ψ is the angle of inclination of the straightener of the generatrix of the rotation hyperboloid; R, R are the inner and outer circumferential radii of the protrusion, respectively, while the angle of inclination of the rectilinear generatrix lies within 90 <ψ ≅ 80.2. An element according to claim 1, characterized in that the fibrous material is placed in a polymer matrix. The element according to claim 2, characterized in that the polymer matrix is made of a material with a Young's modulus lying within 10 MPa <E <500 MPa, where E is Young's modulus.

Description

Tubular flexible element

The invention relates to the field of manufacture of pipes, namely flexible elements with corrugated wall oh. and it can be used in the manufacture of bellows, oversized hoses, hoses used to facilitate MOHTasta, to compensate for temperature movements and reduce vibrations in oil, gas pipelines, heating networks, lines of transportation of aggressive media, etc.

A tubular flexible element is known, containing an inner corrugated shell made of plastic and external braid; for fiber material, short circuit, in; protrusion of goFr and partially gripping end Fittings (see application, Fra, NTsi N 2503225, 1976 MKI about F 16L 13/14, 11/14).

This element has a HHSicyBj load-bearing capacity when burnt by internal pressure due to the low strength of the material of the internal corrugated element made of unarmoured homogeneous plastics.

Known to Tucke is a flexible element, including a sealed corrugated shell reinforced with layers of B01lock, a sheet of material that completely grips the protrusions of the GOFs and partially end Fittings (U.S. Patent No. 3857415, F16L 9/12, 1972.

Thanks to the design, it allows to slightly increase the bearing capacity due to the inclusion of a braiding layer in the power circuit with full coverage of the protrusions of the dialects.

At the same time, the level of non-adhesive ability of such a design remains low due to:

-low implementation of the characteristics of the reinforcing material in the product, inherent in braid structures, characterized by repeated bending during weaving;

- the absence of closed power connections in the coverage area of the fibrous material, the material of the end Fittings;

-on the identity of the subjective Factor in the adjustment of the braiding machine, which does not guarantee the contact of the threads with the mandrel.

IPC F16L il / li Fi6 J 3/04

 about

The inventive design has a greater load-bearing capacity and allows you to expand the product range both by diameter (up to 2.5 m1, and by load of 6 o'clock (extra morning pressure up to 7.0 MPa).

This is achieved by that. that in the known flexible tubular element formed by cross layers of fibrous material with a partial coverage of the end Fittings and having protrusions on the outer profile containing surfaces of semi-solid and negative curvature, surfaces of negative curvature are in the form of a single-cavity hyperboloid of revolution, and the fibrous material is made of continuous bundles and / or threads or tapes of them with a variable angle of reinforcement climbing within:

 and a-ics n

where is the angle of reinforcement of the fibrous material;

Ф is the angle of inclination of the rectilinear generatrix of the hyperboloid of revolution;

and J. internal and external: the circumferential radii of the protrusions, respectively, while the angle of inclination of the rectilinear generatrix lies within:

ff (f do

In addition, the tubular flexible element can be placed in a polymer matrix.

In addition, polymeric microcells; sponges can be made of polymeric material with a Young's modulus lying within:

fW / 7a

(2)

the implementation of the surface of negative curvature in the Form of a single-cavity hyperboloid of rotation allows you to increase the implementation of the characteristics of the fibrous material due to the ability to lay it by the method of winding, which allows for rational tension of the fibrous material., affecting the load-bearing capacity of the product.

The implementation of the fibrous material from continuous bundles and / or threads or tapes from them by replacing the braiding method with winding, allows you to create a closed (loop) circuit by turning continuous bundles and / or threads in the neck area of the end fittings when changing the voltage (sign) angle a forming a fibrous material.

The variable angle of reinforcement of the fibrous material, le5k; the same within the limits determined by dependence (1), allows you to create the optimal (geodetic) reinforcement scheme, which is impossible when implementing the braid version.

The maximum value of the angle / is selected from the condition that the angle of a. Reinforcement of the fibrous material coincides with the angle of inclination of the straight-line generatrix at the minimum protrusion radius, which is the real pole of the one-cavity rotation hyperboloid.

Mismatch of the angle of reinforcement with the angle of inclination of the rectilinear generatrix at the minimum radius of protrusion will lead to non-adhesion of the fibrous material to the mandrel, which is unacceptable.

The minimum value of the angle of reinforcement of the fibrous material follows from the well-known Rilero law (4), which determines the behavior of the fibrous material laid on the body of revolution along geodesic lines:

/. f /.f where is the current circumferential radius of rotation.

body protrusion

in this construction, i- in expression (4) is selected based on the short-circuit coincidence of the angle of the armcrosbank of the fibrous material with the yi-slope of the straight line generatrix at the minimum circumferential radius of the protrusion, namely:

i lp a-jin /

de (Y is the actual pole of the unilinear hyperboloid of the fourth.

Based on tax conditions (b);

OGG1 g-T ITT /. 1T tl iT i i vr / nTi- .h WHT T D. .di-v Jriii n i / iOi iitijJtii-l ± i-i хъ

  . -J - ///;

/// Sin - /. - SLfi

. The expression (9j defines the right twa (1).

- 4, rd; , t. . h tga - (KJT r 7 Q; О r: - ol 0.at-c: nil-T.ri V; / I.;,. -;. part of the lawsuit, it is equal;.: Establishment of limits for choosing .values due to the following Factors:

At Г-0, the hyperboloid grows in a plane, which will not allow the laying of continuous strings or threads.

When significantly increases the width of the bottom of the groove, which is not involved in the process of deformation of the tubular element when axial loads are applied, which reduces the relative compensating ability of the element.

Moreover, with an increase in the angle m, the angle of the tangent to the accuracy of the transition of the hyperboloid of rotation to the surface of the increasing curvature decreases, which will reduce the bearing capacity of the element due to an increase in bending stresses in this zone.

Placing the fibrous material in the polymer MEGTRIC allows in some cases, for example, low loads., To get rid of the need to use a separate sealing shell. In addition, such a matrix is a binder material and allows you to more evenly distribute the loads acting on the material and the stresses arising in it.

The choice of a matrix with an elastic modulus that has values within the expression (3) can reduce the likelihood of fracture under cyclic loads; in this case, the use of a material with Young's modulus leads to an increase in the interlayer tangential strains causing matrix destruction.

Reducing the elastic modulus to values less than the brain leads to the loss of the shape of the tubular element even in the absence of external loads, i.e. such an element is extremely inconvenient for storage and operation.

The design of the tubular / flexible element is illustrated by drawings:

Figure 1 shows a sectional view of a tubular flexible element with a sealing inner shell.

Figure 2 shows a portion of a tubular element (side view) with one 11 turns of fibrous material.

the flexible tubular element (FigL) contains cross layers of fibrous material 1, partially covering the end fittings 2,3 and having protrusions along the external profile (marked with), containing surfaces A — positive curvature and B — negative curvature in the form of a single-cavity rotation hyperboloid with a true pole and an angle of inclination of a rectilinear generatrix. Inside the tubular flexible element there is a sealing shell 4, the end parts of which are fixed between each fitting 2,3 and rings 5,6, tightened by bolts 7,8.

Each of the turns 9 (FIG. 2) of the cross fibrous layers i in the zones B of negative curvature has a reinforcement direction that coincides with the rectilinear generatrix.

The flexible tubular element 9 is formed by relief layers of fibrous reinforced material 10 adhered to the polymer matrix 9, for example, a polyurethane binder. The end fitting 12 on the outside surface (not indicated) has an annular groove 13 into which the cross layers 10 impregnated with a binder 11 are wound using ring layers 14.

A flexible tubular element works as follows: with the help of fittings 2,3, it is welded into the pipeline (not shown in the drawing) and, together with the latter, is loaded with an internal yes, a phenomenon, while the cross layers of fibrous material 1 (10) take up loads and provide the strength of the pipeline, and the inner layers 4 or the polymer matrix 11 ensuring its tightness.

During axial movements of the pipeline caused by temperature changes, it flexibly deforms and reduces stress in the pipeline.

 7

The inventive design allows the use of bellows short-circuit, non-woven material in highly loaded pipelines of large diameter, thereby increasing their reliability by service life.

r AMT KPP LLP ;;; :::::::; L i

director

iTOfbl;

 A.A.SHILOV

.A. Buldakov -A. N. Goldyrev S. IN . Mikhailuk. B.G. Mozerov P.A. Novikov E.A. Pok, ataev A.V. Smirnov in

/ A.N. Tokare.

Claims (2)

1. A tubular flexible element formed by cross layers of fibrous material with a partial coverage of the end fittings and having protrusions along the outer profile containing surfaces of positive and negative curvature, characterized in that the surfaces of negative curvature are in the form of a one-cavity hyperboloid of revolution, and the fibrous material is made of continuous bundles and / or threads, or tapes of them with a variable angle of reinforcement, lying within

where Φ _i is the angle of reinforcement of the fibrous material;
ψ is the angle of inclination of the rectilinear generatrix of the hyperboloid of revolution;
R _{in n} , R _n - inner and outer circumferential radii of the protrusion, respectively,
the angle of inclination of the rectilinear generatrix lies within 90 ^° <ψ ≅ 80 ^° .
2. The element according to claim 1, characterized in that the fibrous material is placed in a polymer matrix. 3. The element according to claim 2, characterized in that the polymer matrix is made of a material with a Young's modulus lying within 10 MPa <E <500 MPa, where E is Young's modulus.