CN101358679A - Balance type arced pipe joint with large displacement compensation capability - Google Patents

Abstract

A balancing arc tube joint with a large displacement compensation capacity relates to a rubber tube joint used under a large displacement compensation situation which consists of connection flanges at two ends and a middle arc tube body; the tube body consists of an inner gel layer, a skeleton layer and an outer gel layer. The tube body is an arc returning convex structure; the skeleton layer consists of a plurality of layers of fiber curtain lines that are crossed and twisted; the fiber curtain lines are twisted by the tracks calculated by a balancing design principle. The invention is used for the flexible connector of a pipeline system which eases the forces and flexural moments generated by the factors in the pipeline system caused by heat expansion, compensates the larger displacement of the pipeline on the directions for three freedom of motion caused by vibration and impact as well as realizes the large displacement compensation of the pipeline on the directions for three freedom of motion. The balancing arc tube joint has a smaller size; the body of the tube has an excellent balancing performance; the coaxial direction of the invention is basically not changed under the working pressure of the liquid in the tube, thus being incapable of bringing additional force and displacement to the system.

Description

The balance type arced pipe joint that large displacement compensation capability is arranged

Technical field

The present invention relates to a kind of rubber fittings that is used under big bit shift compensation situation.

Background technique

In some important pipe-line systems of naval vessel and industrial field, the influence of particular surroundings factor because vibration, impact and system expand with heat and contract with cold etc., certain relative displacement or the additional force of generation between pipeline joint or pipeline and the equipment can be caused, pipe-line system and equipment can be damaged when serious.In order to prevent this class infringement, need in pipe-line system, add flexible connector, it can be implemented in the three degree of freedom direction and all have good displacement compensation capability; It also must possess and can realize bigger bit shift compensation, good damping property, anti-pulling-and-doffing performance energy and high fatigue strength at little axial space simultaneously.But in pipe-line system, the working pressure of pipe-line system often changes or produces pulsatile impact, these variations and impact may make flexible connector produce distortion, thereby piping and equipment are produced extra additional forces and displacement, can influence the proper functioning of system or bring serious consequence when serious.As seen, pipeline connecting parts also must make it satisfy the balance requirement when must possessing lower vertical stiffness, lateral stiffness and flexural rigidity produce crooked, internal force with the bit shift compensation of realizing three directions, the distortion of balance piping effect.The measurement index of balance is tensile strain rate, bending deflection and the corresponding reaction force of pipeline flexible connector under the effect of tube fluid working pressure.

Navy Engineering Univ. PLA has applied for patent of invention " three flange structure self-balancing type flexibility connection pipes " (Chinese patent 200410012867.7), comprise adpting flange, rubber tube body, adpting flange is made up of outward flange, spacer flanger, inner flange and four parts of separation sleeve, rubber tube body inner glue layer, framework layer and outer glue-line constitute, the angle that the cord that framework layer is made into by aramid fibre calculates by balance is twined and is formed, and initial winding angle formula is:

cosα ₁＝0.578(1+δ)

In the formula, α ₁-initial winding angle, δ-aramid line elongation percentage

The aramid fiber cord is fixedly clamped by inner flange, outward flange after spacer flanger unrolls.

Summary of the invention

The objective of the invention is at above-mentioned present situation, aim to provide a kind of reduced size that has, but retainer shaft is to indeformable under the working pressure effect in pipe, but on the three degree of freedom direction compensation conduit because vibrate, the balance type arced pipe joint of big displacement that percussion causes.

The implementation of the object of the invention is, the balance type arced pipe joint that large displacement compensation capability is arranged, adpting flange and middle arc body by two ends constitute, body is made up of inner glue layer, framework layer and outer glue-line, the curved revolution convex configuration of body, framework layer is to be made of the even level fiber cord that intersection is twined, and the track that fiber cord calculates by the balance design principle twines formation, and the winding path formula is:

$\tan \mathrm{\α}=\sqrt{1+\frac{b}{r+b}}$

In the formula, α is the cord winding angle, b be body bus centre of curvature to axial line distance, r is the body turning radius.

The present invention has taken all factors into consideration the influence of axial rigidity and flow noise, through theory and experimental research, the track that employing is calculated by the balance design principle twines formula the fiber cord intersection is wound in the arc rubber hose with equilibrium response, and cooperate with adpting flange, as the pipe-line system flexible connector, alleviate the power and the moment of flexure that produce because of factors such as thermal expansions in the pipe-line system, compensation realizes the big bit shift compensation of pipeline on the three degree of freedom direction owing to vibration, percussion cause the big displacement of pipeline on the three degree of freedom direction.

The present invention has reduced size, and body has good balance, and it is under the working pressure effect of tube fluid, and axial deformation is little, can not bring excessive additional force and additional displacement to system.

Description of drawings

Fig. 1 is a structural representation of the present invention

Fig. 2 is fiber cord intersection winding form figure

Fig. 3 is that the winding path formula is got the parameter schematic representation

Embodiment

With reference to Fig. 1, the present invention is made of the adpting flange 4 and the middle body at two ends, and body is made up of inner glue layer 1, framework layer 2 and outer glue-line 3.Framework layer is to be made of the even level fiber cord that intersection is twined.

Fiber cord is fiber cords such as aramid fiber, polyester, nylon or terylene.

A large amount of studies show that, the skeleton winding angle of appropriate design flexible pipe body, can realize that flexible pipe body is axially indeformable substantially under certain interior pressure effect, be embodied in straight length upper skeleton material and twine by a fixing angular cross, the winding angle that is embodied in arc body upper skeleton material then is a space angle that changes.

The track that employing is calculated by the balance design principle twines formula fiber cord is wound in the arc rubber hose with equilibrium response by intersection winding form shown in Figure 2, can make arced pipe joint realize the balance requirement.This arc rubber hose with equilibrium response, cooperate suitable adpting flange, as the pipe-line system flexible connector, can realize the big bit shift compensation of pipeline on the three degree of freedom direction, also have less bulk, favorable damping performance simultaneously, satisfy the requirement of pipe-line system vibration shock isolation.

Fig. 3 represents the winding path formula $\tan \mathrm{\α}=\sqrt{1+\frac{b}{r+b}}$ Parameter alpha in the formula, b, r.

α is the cord winding angle, i.e. angle between the body bus at cord and winding point place; B be body bus centre of curvature to axial line distance, the centre of curvature of body bus of promptly twining the some place is to the distance of body axis; R is the body turning radius, promptly twines the distance of point to the body axis.

It is that the diameter biggest place calculates that the compressive strength of body is got its weakness, and formula is as follows:

In the formula: P _BBe sebific duct compressive strength, Kgf/cm ²K _BBe cord intensity, Kgf/cm; I is for twining the number of plies; D _MeterBe calculated diameter, cm; C ₃Be cord elongation at break+1; C ' is a comprehensive correction factor.

Calculate and verification experimental verification according to above-mentioned compressive strength formula, this joint is when axial deformation ± 20mm or radial deformation ± 18mm, the body compressive strength all can reach more than the 14MPa, promptly still reach the above reliability deposit of three times of rated working pressures, think that thus this joint has large displacement compensation capability.

Enumerate example of the present invention below: the interface latus rectum is that the arced pipe joint pipe structure parameter of 100mm is as follows:

Body length 150mm bus radius of curvature 150mm

60 ° of bus centre of curvature of the central angle of bus correspondence are to axial line distance b 79.9mm

The skeleton number of plies 4 cord diameter 1.3mm

Outer glue-line 3 thickness 3mm framework layers 2 thickness 0.3mm

Inner glue layer 1 thickness 3mm,

The turning radius and the cord winding angle at different cross section angle of circumference place see the following form

By the present invention that the above turning radius and cord winding angle are produced, under the 3-4Mpa of tube fluid working pressure, axial deformation is less than 2mm.When axial deformation ± 20mm or radial deformation ± 18mm, the body compressive strength can reach more than the 14MPa.

Claims (2)

1. The balance type arced pipe joint that 1, large displacement compensation capability is arranged, adpting flange and middle flexible pipe body by two ends constitute, body is made up of inner glue layer, framework layer and outer glue-line, it is characterized in that the curved revolution convex configuration of body, framework layer is to be made of the even level fiber cord that intersection is twined, the track that fiber cord calculates by the balance design principle twines and constitutes, and the winding path formula is:

   $\tan \mathrm{\α}=\sqrt{1+\frac{b}{r+b}}$

   In the formula, α is the cord winding angle, b be the circular arc centre of curvature to axial line distance, r is the body turning radius.
2. 2, the balance type arced pipe joint that large displacement compensation capability is arranged according to claim 1 is characterized in that fiber cord is fiber cords such as aramid fiber, polyester, nylon or terylene.

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