CN205605999U - Double -deck machinery pipe of array type predeformation and lining pipe thereof - Google Patents

Abstract

The utility model discloses a double -deck machinery pipe of array type predeformation and lining pipe thereof. Outer inside pipe wall is hugged closely to the outer wall of lining pipe, and has the plastic deformation who does not laminate many places between the inner wall of the outer wall of lining pipe and outer tube. Plastic deformation sets up in the surface of lining pipe, and towards the central undercut of lining pipe, plastic deformation's position is the critical defective position of lining pipe, and the critical defective be the artificial defect of periodicity setting. The utility model discloses a critical defective of double -deck machinery pipe of array type predeformation and lining pipe thereof through setting up a plurality of periodicity, regularity artificially and arranging has changed the contact structure of inner tube and outer tube to avoid the irregular defect that the backing layer produced at random.

Description

Array type predeformation bilayer mechanical tube and lining pipe thereof

Technical field

This utility model relates to a kind of double-skin duct and lining pipe thereof, more particularly, it relates to a kind of array type predeformation Double-deck mechanical tube and lining pipe thereof.

Background technology

The anti-corrosion pipeline used in petroleum industry, outer tube and lining pipe are all metal materials.This is a kind of bimetallic lining In manage, English is MECHANICALLY LINED PIPE, is abbreviated as MLP, and this patent translates into mechanical tube.This mechanical tube is Overlap a thin anti-corrosion alloy backing layer in the inside of carrier pipe, thus be combined into bimetal tube.The metal liner of traditional mechanical pipe In exist a technical bottleneck, it is simply that when mechanical tube bears bending load, metal liner layer easily comes off from outer tube unstability.

Due to the bi-material layer machinery joint product required for a variety of causes (than anticorrosion described above), wherein the inside is relatively thin One layer be backing layer.Outer layer and nexine are compound next one-body molded by machinery.Machinery is compound be on a kind of physical layer (such as Pass through pressure) combination, there is no interatomic combination in metallographic aspect.This bi-material layer machinery joint product is applicable to various The structure of various kinds, the structure of any shape such as including casing, cylinder or spheroid.

The ectonexine of bi-material layer machinery joint product needs to use different materials, thus ectonexine each plays each Effect, such as in anti-corrosion pipeline, outer tube is the effect that high-strength steel plays carrying, inner liner layer be alloy play antiseptical make With.The ectonexine of bi-material layer machinery joint product generally uses the material that price is different.Ratio anti-corrosion pipeline as previously mentioned, Outer tube material is the common high-strength steel that price is relatively cheap, and nexine metal liner layer is expensive alloy-layer.By setting Meter uses relatively thin metal liner layer, thus plays cost-effective purpose.

Up to the present, backing layer is pipe purely, uses and the living shape of outer tube, its starting point be make double Two pipes of material layer pipe are tried one's best becomes a pipe, if deformed, common eigenvector.

In order to reach this purpose, when manufacturing bi-material layer machinery joint product, current technique typically requires and exists in advance Inner and outer pipes faying face polishes smooth in advance, it is ensured that do not stay any gap between inner and outer pipes so that inner and outer pipes become one whole Body.

But this purely pipe lining is actually extremely difficult to not stay the requirement in any gap.Regardless of machining accuracy Height, interior exterior materials layer is actually impossible to be processed into cylinder purely, i.e. there is " geometrical defect " between inner and outer pipes, and Defect tends to occur at different places.This small difference, causes the backing layer of tradition bi-material layer machinery joint product By bending time, the pipeline in such as petroleum industry is when reel is installed, and backing layer (inner tube) departs from from outer tube unstability, and takes off The place that falls is the position at " defect " place.

There is serious defective workmanship in this traditional mechanical Manifold technology because fineness be it is difficult to ensure that, only in theory On it is possible to.As long as having tiny flaw at inner tube outer surface or outer pipe internal surface, mechanical tube understands unstability unavoidably.

In the face of unstability comes off problem, popular solution is to increase the thickness of backing layer, is pressed by purely pipe backing layer Counter-bending unstability needs and is continuously increased wall thickness.But this is intended that in order to cost-effective with bi-material layer machinery joint product Starting point is runed counter to.

Utility model content

The problem easily fallen off for " defect " place of bimetallic tube present in prior art, mesh of the present utility model Be to provide a kind of array type predeformation bilayer mechanical tube and lining pipe thereof.

For achieving the above object, this utility model adopts the following technical scheme that

A kind of array type predeformation bilayer mechanical tube, including outer tube and lining pipe.The outer wall of lining pipe is close in outer tube There is between wall, and the outer wall of lining pipe and the inwall of outer tube the plastic deformation do not fitted in many places.

According to an embodiment of the present utility model, plastic deformation is arranged at the surface of lining pipe, and towards in lining pipe Heart concave downward, the position of plastic deformation is the critical defective position of lining pipe, and critical defective is that the artificial of periodically setting lacks Fall into.

According to an embodiment of the present utility model, critical defective position is: W_o(x, θ)=W_ocr·f_ox(x)·f_oθ(θ), its In: W_oFor critical defective, it is axial x coordinate and the function of circumference θ coordinate, wherein f_oxX () is axial function,L is duct length, m_oBeing axial half-sine wave number, a is index；f_oθ(θ) be Circumference function,n_oBeing circumference half-sine wave number, b is index；W_ocrFor critical defective Value, as a=b=2, critical defective value isK1, k2 and k3 are by work The constant that condition determines, R_LFor lining radius, L is duct length.

According to an embodiment of the present utility model, outer tube and lining pipe are metal material.

According to an embodiment of the present utility model, the position of plastic deformation is regularly arranged array configuration.

According to an embodiment of the present utility model, at each plastic deformation, it is equipped with reinforcement.

According to an embodiment of the present utility model, the intensity of outer tube is more than the intensity of lining pipe.

For achieving the above object, this utility model adopts the following technical scheme that

A kind of array type predeformation lining pipe, the surface of lining pipe has multiple plastic deformation, and plastic deformation is arranged at lining In the surface of pipe, and towards the center concave downward of lining pipe, the position of plastic deformation is the critical defective position of lining pipe, Critical defective is the artificial defect periodically arranged.

According to an embodiment of the present utility model, critical defective position is: W_o(x, θ)=W_ocr·f_ox(x)·f_oθ(θ), its In: W_oFor critical defective, it is axial x coordinate and the function of circumference θ coordinate, wherein f_oxX () is axial function,L is duct length, m_oBeing axial half-sine wave number, a is index；f_oθ(θ) be Circumference function,n_oBeing circumference half-sine wave number, b is index；W_ocrLack for critical Falling into value, as a=b=2, critical defective value isK1, k2 and k3 are for pressing The constant that operating mode determines, R_LFor lining radius, L is duct length.

According to an embodiment of the present utility model, the position of plastic deformation is regularly arranged array configuration.

In technique scheme, array type predeformation bilayer mechanical tube of the present utility model and lining pipe thereof are by artificial Arrange multiple periodicity, systematicness arrangement critical defective, change the contact structures of inner and outer tubes, thus avoid lining The irregular defect that layer randomly generates.

Accompanying drawing explanation

Fig. 1 is the structural representation of existing backing layer；

Fig. 2 is the structural representation of this utility model backing layer；

Fig. 3 is predeformation axial array schematic diagram；

Fig. 4 is predeformation circumferential array schematic diagram；

Fig. 5 is the flow chart of this utility model array type predeformation lining method for prefabricating；

Fig. 6 A～6C is the schematic diagram of reinforcement.

Detailed description of the invention

The technical solution of the utility model is further illustrated below in conjunction with the accompanying drawings with embodiment.

The utility model discloses a kind of particular type of novel backing layer, apply the bimetallic tube of this backing layer and be somebody's turn to do The manufacture method (method for prefabricating and the reinforcement of cooperation thereof) of bimetallic tube.Core of the present utility model is backing layer, its Chinese name Full name is array type predeformation backing layer, and English name full name is Grid-Lined Pre-Dimpled Liner, is abbreviated as GPL, the backing layer of this array type that has been a kind of pre-add deformation, such as it is pre-machined at axial and circumferential the most according to certain rules The non-purely column type backing layer of the minute asperities deformation of arrangement.

As depicted in figs. 1 and 2, being the schematic diagram with one section of pipe lining of grid representation, outer tube does not draw, Qi Zhongtu 1 is pipe purely, and Fig. 2 is artificially at purely pipe surface lining after processing thus define prestrain especially.

The theoretical basis of formation predeformation lining is critical defective.

In theory, purely pipe lining can bear infinitely-great bending load and keep pipe state constant.But Purely pipe is impossible, because processing technique whatever, can leave geometrical defect the most unavoidably.Geometrical defect big The bearing capacity of little decision lining.When actual geometrical defect is less than critical defective, lining has the bending resistance of infinite height； And when geometrical defect is more than critical defective, bending resistance is gradually lost in the increase along with bending load by lining.

The definition of formation predeformation backing layer is: be applied with the backing layer of critical defective.

The purpose of the applied predeformation of predeformation lining avoids backing layer by applying critical defective artificially The irregular defect randomly generated.Critical defective is a kind of optimization selection of a lining pipe, and its bending resistance is Greatly.

Therefore, as in figure 2 it is shown, array type predeformation bilayer mechanical tube of the present utility model, including outer tube 1 and lining pipe 2. The outer wall of lining pipe 2 is close between the inwall of outer tube 1, and the inwall of the outer wall of lining pipe 2 and outer tube 1 have what do not fitted in many places Plastic deformation.Plastic deformation is arranged at the surface of lining pipe 2, and towards the center concave downward of lining pipe 2, the position of plastic deformation Being set to critical defective 3 position of lining pipe 2, critical defective 3 is the artificial defect periodically arranged.

Further, as in figure 2 it is shown, the position of plastic deformation is regularly arranged array configuration, and mould at each Reinforcement 4 all can be provided with at property deformation.Additionally, outer tube 1 and lining pipe 2 are metal material, the intensity of outer tube 1 is more than lining The intensity of pipe 2.

Specifically, critical defective 3 is distributed in liner surface, and its defect size changes with axial and circumferential, it may be assumed that

W_o(x, θ)=W_ocr·f_ox(x)·f_oθ(θ) (1)

In formula (1):

W_oFor critical defective, it is axial x coordinate and the function of circumference θ coordinate

f_oxX () is axial function

f_oθ(θ) it is circumference function

W_ocrFor critical defective value

Axial and circumferential function depends on that the operating mode of concrete lining, a kind of approximate calculation method are that axial function is simplified For:

$f_{ox}\left(x\right)={\left(cos\right(\frac{m_o\·\mathrm{\π}\·x}{L}\left)\right)}^a---\left(2\right)$

In formula (2), L is duct length, m_oBeing axial half-sine wave number, a is index.

Circumference function can be reduced to simultaneously:

$f_{o\mathrm{\θ}}\left(\mathrm{\θ}\right)={\left(cos\right(\frac{n_o\·\mathrm{\θ}}{2}\left)\right)}^b---\left(3\right)$

In formula (3), n_oBeing circumference half-sine wave number, b is index.

Once axial and circumferential function determines, critical defective value just can be tried to achieve according to energy method, as a=b=2, faces Boundary's defective value can be expressed as:

$w_{ocr}=\frac{k_1\·R_L\·L^2}{k_2\·{m_o}^2\·{R_L}^2+k_3\·{n_o}^2\·L^2}---\left(4\right)$

In formula (4), k1, k2 and k3 are the constant determined by operating mode, R_LFor lining radius, L is duct length.

The method of above-mentioned calculating critical defective can also expand to following algorithm:

The number of array type predeformation, generally uses m₀, n₀Express.

Such as m in Fig. 3₀N in=8, Fig. 4₀=16.Concrete m₀And n₀Size depend on the material of inner and outer pipes 1 and 2, diameter and The parameters such as wall thickness, and need certainly to be determined by analytical calculation according to actual condition.

Predeformation in theory can with the sine wave launched such asWithExpress.

Each predeformation is the most tiny, and being that a kind of nick in lining pipe 2 radial direction is convex (can liken in schedule life Common dimple or ripples), thus do not affect the mechanical function of pipeline.Size W of predeformation_ocrExpress:

$w_{ocr}=-\frac{{\mathrm{\μ}}_3}{{\mathrm{\μ}}_2}---\left(5\right)$

In formula (5): μ₂And μ₃Respectively:

${\mathrm{\μ}}_2=({\mathrm{\μ}}_1\·\frac{t_L}{R_L}-{\mathrm{\α}}_{L2})\·C_w---\left(6\right)$

${\mathrm{\μ}}_3=({\mathrm{\α}}_{L2}-{\mathrm{\μ}}_1\·\frac{t_L}{R_L})\·C_{wow\_a}+({\mathrm{\α}}_{L1}-\mathrm{\ν}\·{\mathrm{\μ}}_1\·\frac{t_L}{R_L})\·C_{wow\_b}---\left(7\right)$

In formula (6):

${\mathrm{\μ}}_1=\frac{{\mathrm{\α}}_{L2}+{\mathrm{\α}}_{P2}\·{\mathrm{\μ}}_{P1}}{ln\left(R_{Po}\right)-ln\left(R_{Li}\right)}---\left(8\right)$

α_L2=α_Lθ+να_Lx (9)

α_P2=α_Pθ+να_Px (10)

${\mathrm{\μ}}_{P1}=\left(\frac{{\mathrm{\β}}^{\frac{t_P}{R_r-R_{Lo}}}-1}{ln\left(\mathrm{\β}\right)}\right)\left(\frac{R_r-R_{Lo}}{t_L}\right)---\left(11\right)$

$C_w=\frac{\mathrm{\π}\·L\·t_L}{2}---\left(12\right)$

$C_{wo\mathrm{\δ}w\_a}=\frac{3\·L}{8}---\left(13\right)$

C_{woδw_b}=π (14)

T in formula (6) to formula (14)_L、t_PIt is lining pipe 2 and the wall thickness of outer tube 1, R respectively_Li、R_LoAnd R_LIt is lining respectively The inside radius of pipe 2, outer radius and center line radius, R_POIt is the external diameter of outer tube 1, R_rValue 1000R can be distinguished with β_LWith 0.001, α_Lx、α_Lθ、α_PXAnd α_PθBeing lining pipe 2 and outer tube 1 thermal coefficient of expansion at axial and circumferential respectively, ν is Poisson's ratio.

As a example by one section of 0.3m length submarine pipeline, bearing High Temperature High Pressure, its parameter is given in table one and table two:

Table one: pipe parameter

Table two: thermal coefficient of expansion

Predeformation under this operating mode presses aligned transfer at circumferential and axial, as shown in Table 3:

Table three: predeformation array arrangement

mo	no	wocr(mm)
			7	25	0.1

For this utility model outer tube 1 and the two-layer pipe of lining pipe 2, it has two kinds of different sides in processing technology Formula.The first makes outer tube 1 and lining pipe 2 respectively, and another method is to use array type predeformation lining method for prefabricating, as Shown in Fig. 5, mainly comprise the steps that

S1: according to the shape and size of outer tube 1, make the prefabricated component of the lining pipe 2 matched with outer tube 1.

S2: calculate multiple predeformation position on the outer surface of prefabricated component, predeformation position is the critical of prefabricated component and lacks Falling into 3 positions, critical defective 3 is the artificial defect periodically arranged.

S3: inserted by prefabricated component among outer tube 1, can be divided into following 2 sub-steps specifically:

S3.1: reinforcement 4 is set in the predeformation position calculated.

S3.2: the prefabricated component with reinforcement 4 is inserted among outer tube 1.

S4: apply internal pressure in pipe so that prefabricated component is integrally forming with outer tube 1, and prefabricated component is in the week of predeformation position Limit produces small plastic deformation.

In above-mentioned steps, calculate the method for critical defective 3 as it was previously stated, repeat no more here.

Additionally, reinforcement 4, as shown in figs 6 a-6 c, reinforcement 4 all can be used in the structure and method for prefabricating of bimetallic tube For regular shape parts, by the most regularly arranged outer surface being arranged at lining prefabricated component, such as, form axial or circumferential battle array Row arrangement.The material of reinforcement 4 is high-strength steel, its intensity more than or equal to the material of outer tube 1, its be shaped as cube thin slice or Spherical particles.

Reinforcement 4 can have variform, both can be the parts being distributed by certain regular discrete, it is also possible to is continuously rule The parts being then distributed.

Reinforcement 4 shown in Fig. 6 A and 6B is regular discrete distribution, and the reinforcement 4 shown in Fig. 6 A is cube, and schemes Reinforcement 4 shown in 6B is " ten " font, it is also possible to be " one " font or " | " font.Reinforcement 4 shown in Fig. 6 C is Continuous distribution, be equivalent to the criss-cross each edge of Fig. 6 B to extend respectively, and be connected with each other between adjacent reinforcement 4 Form network-like reinforcement 4, thus realize the regularly arranged of continuous distribution.

In sum, when the inner tube outer surface of mechanical tube or the defect of outer pipe internal surface are less than critical defective, mechanical tube Unstability comes off the most never.Mechanical pipe critical defective is the least, in the range of hundreds of silk.New according to this practicality The critical defective of type is theoretical, and traditional mechanical pipe cannot control the accuracy of manufacture in technique in the manufacturing cost allowed at all expires The requirement of foot critical defective.

Therefore, technique is improved with it to guarantee that the fineness on surface, to prevent backing layer unstability from coming off, is not so good as to lack by critical Fall into and introduce defect so that inner liner can small unstability come off everywhere, thus prevents local buckling from coming off.

The thickness of inner lining that traditional mechanical pipe needs increases thickness along with requiring to improve to bending, and of the present utility model double The liner thickness of layer pipe even has only to 1mm thickness, or uses the minimum thickness required for processing technique.

Those of ordinary skill in the art is it should be appreciated that above embodiment is intended merely to illustrate that this practicality is new Type, and it is not used as to restriction of the present utility model, as long as in spirit of the present utility model, to the above The change of embodiment, modification all will fall in Claims scope of the present utility model.

Claims (10)

1. an array type predeformation bilayer mechanical tube, it is characterised in that including:

Outer tube and lining pipe；

The outer wall of described lining pipe is close to have between outer tube wall, and the inwall of the outer wall of described lining pipe and described outer tube many The plastic deformation that place does not fits.

2. array type predeformation bilayer mechanical tube as claimed in claim 1, it is characterised in that described plastic deformation is arranged at lining In the surface of pipe, and towards the center concave downward of lining pipe, the position of described plastic deformation is the critical defective position of lining pipe Putting, described critical defective is the artificial defect periodically arranged.

3. array type predeformation bilayer mechanical tube as claimed in claim 2, it is characterised in that described critical defective position is:

W_o(x, θ)=W_ocr·f_ox(x)·f_oθ(θ), wherein:

W_oFor critical defective, it is axial x coordinate and the function of circumference θ coordinate, wherein

f_oxX () is axial function,L is duct length, m_oIt it is axial half-sine wave Number, a is index；

f_oθ(θ) it is circumference function,n_oBeing circumference half-sine wave number, b is index；

W_ocrFor critical defective value, as a=b=2, critical defective value is

K1, k2 and k3 are the constant determined by operating mode, R_LFor lining half Footpath, L is duct length.

4. array type predeformation bilayer mechanical tube as claimed in claim 1, it is characterised in that described outer tube and lining pipe are Metal material.

5. array type predeformation bilayer mechanical tube as claimed in claim 1, it is characterised in that the position of described plastic deformation is Regularly arranged array configuration.

6. array type predeformation bilayer mechanical tube as claimed in claim 5, it is characterised in that at each described plastic deformation It is equipped with reinforcement.

7. array type predeformation bilayer mechanical tube as claimed in claim 1, it is characterised in that the intensity of described outer tube is more than institute State the intensity of lining pipe.

8. an array type predeformation lining pipe, it is characterised in that the surface of described lining pipe has multiple plastic deformation, described Plastic deformation is arranged at the surface of lining pipe, and towards the center concave downward of lining pipe, the position of described plastic deformation is lining In the critical defective position of pipe, described critical defective is the artificial defect periodically arranged.

9. array type predeformation lining pipe as claimed in claim 8, it is characterised in that described critical defective position is:

W_o(x, θ)=W_ocr·f_ox(x)·f_oθ(θ), wherein:

W_oFor critical defective, it is axial x coordinate and the function of circumference θ coordinate, wherein

f_oxX () is axial function,L is duct length, m_oIt it is axial half-sine wave Number, a is index；

f_oθ(θ) it is circumference function,n_oBeing circumference half-sine wave number, b is index；

W_ocrFor critical defective value, as a=b=2, critical defective value is

K1, k2 and k3 are the constant determined by operating mode, R_LFor lining half Footpath, L is duct length.

10. array type predeformation lining pipe as claimed in claim 8, it is characterised in that the position of described plastic deformation is rule The array configuration then arranged.