CN219140162U - Bent pipe - Google Patents

Abstract

The utility model provides a bent pipe, which comprises a bent pipe body, wherein the inner wall surface of the bent pipe body is recessed with a V-shaped groove extending along the circumferential direction, the top and the bottom of the bent pipe body with the V-shaped groove are in height difference, so that air flow rotates in the groove to form a stable low-speed countercurrent zone, the zone plays the role of an air cushion, the turbulence intensity of fluid is enhanced, the anti-erosion effect is achieved, and the V-shaped groove not only can improve the anti-erosion characteristic in the bent pipe body, but also has the advantages of small technical difficulty and low cost.

Description

Bent pipe

Technical Field

The utility model relates to the field of gas-solid two-phase flow conveying pipelines, in particular to a bent pipe.

Background

Erosion is the process of surface wear damage caused by particles carried in a fluid striking a surface at high velocity. Research shows that the damage caused by erosion accounts for about 1% -4% of the total value of national production in industrialized countries. The erosion can bring great problems to the transportation industries of petroleum, natural gas and the like, so that the pipe wall becomes thin and even leaks, and the safety operation of equipment is influenced. Elbow fittings, which are components that change flow direction, are more prone to failure by erosion. Studies have shown that the degree of erosion damage at the pipe bend is about 50 times that of the straight pipe section. Erosion damage not only wastes materials, consumes energy and reduces equipment efficiency, but also accelerates equipment failure and reduces the service life of equipment, thereby leading to larger economic loss.

At present, the traditional erosion resistance method mainly starts from the wall surface material, and improves the erosion resistance of the pipe wall by utilizing a composite material, a surface coating, surface modification and the like. The method can reduce erosion to a certain extent, but has the defects of high manufacturing difficulty and high cost, and is not beneficial to energy greening.

Disclosure of Invention

Therefore, the utility model aims to solve the problems, and provides the bent pipe, which reduces erosion and prolongs the service life of a pipeline by recessing the V-shaped groove extending along the circumferential direction on the inner wall surface of the bent pipe body.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

the utility model provides a bent pipe, which comprises a bent pipe body, wherein the inner wall surface of the bent pipe body is recessed with a V-shaped groove extending along the circumferential direction.

The preferable technical scheme of the utility model is that a plurality of V-shaped grooves are uniformly distributed along the length direction of the bent pipe body.

The preferable technical proposal of the utility model is that the cross section of the V-shaped groove is an equilateral triangle.

The utility model adopts the preferable technical scheme that the wall surface of the V-shaped groove formed by the bent pipe body is outwards arched, so that an arched part protruding out of the outer wall surface is formed.

The preferred technical proposal of the utility model is that the section of the arch part is equilateral triangle, the side length is 4mm, and the interval between the two arch parts is 4mm.

The preferable technical scheme of the utility model is that the V-shaped groove is arranged on the outer curved wall of the bent pipe body.

The preferable technical scheme of the utility model is that the annular angle of the V-shaped groove is 180 degrees.

The technical scheme provided by the utility model has the following beneficial effects:

1. the V-shaped groove is arranged on the wall surface in the bent pipe body, the height difference exists between the top and the bottom of the bent pipe body with the V-shaped groove, so that the air flow rotates in the groove to form a stable low-speed countercurrent zone, and the zone plays a role of an air cushion, so that the turbulence intensity of fluid is enhanced; the V-shaped grooves cause the change of the surrounding flow field, some particles are directly blown away from the groove surfaces of the V-shaped grooves under the influence of gas, and the collision frequency of the particles and the inner wall surface (mainly the inner wall surface of the outer curved wall) of the bent pipe body is reduced, so that erosion is reduced.

2. The V-shaped groove not only can improve the erosion resistance inside the bent pipe body, but also has the advantages of small technical difficulty and low cost.

Drawings

FIG. 1 is a main view of an elbow;

FIG. 2 is a main view of a bend in different configurations;

FIG. 3 is an enlarged view of FIG. 2A;

FIG. 4 is a cross-sectional view taken along section line E-E in FIG. 2;

FIG. 5 is a left side view of FIG. 1;

FIG. 6 is a cross-sectional view taken along section line H-H in FIG. 5;

the angle W is 180 degrees of the annular angle of the V-shaped groove;

b is that the section shape of the arched part is an equilateral triangle;

l is the side length of an equilateral triangle with the cross section of the arch part being 4mm;

s is that the distance between two arched parts is 4mm;

j is the outer curved wall of the bent pipe body;

i is an inner curved wall of the elbow body;

in the figure:

1. a bent pipe body; 2. a V-shaped groove; 3. and an arch part.

Detailed Description

For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present utility model. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

The utility model will now be further described with reference to the drawings and detailed description.

The bent pipe with the V-shaped groove 2 structure comprises a bent pipe body 1, the V-shaped groove 2 extending along the circumferential direction is recessed on the inner wall surface of the bent pipe body 1, the height difference exists between the top and the bottom of the bent pipe body 1 with the V-shaped groove 2 inside the bent pipe body 1, so that air flow rotates in the groove to form a stable low-speed countercurrent zone, the zone plays a role of an air cushion, the turbulent flow intensity of fluid is enhanced, the erosion resistance is achieved, and the V-shaped groove 2 not only can improve the erosion resistance inside the bent pipe body 1, but also has the advantages of small technical difficulty and low cost.

Preferably, the V-shaped grooves 2 are uniformly distributed along the length direction of the bent pipe body 1, and are uniformly distributed so as to facilitate processing and manufacturing and reduce the difficulty of the manufacturing process.

Preferably, the V-shaped groove 2 has an equilateral triangle cross-section, and the V-shaped groove 2 has an equilateral triangle cross-section, so that the frequency of collisions of particles with the turns of the elbow body 1 is minimized.

Preferably, the wall surface of the V-shaped groove 2 formed by the bent pipe body 1 is outwards arched, so that an arched part 3 protruding out of the outer wall surface is formed, and the arrangement of the arched part 3 enables the flow velocity of the outer wall surface of the bent pipe body 1 to be obviously lower than that of a common bent pipe, and the collision velocity of particles is reduced, so that the kinetic energy of the collision between the particles and the outer wall surface is effectively reduced, and further erosion of the particles to the outer wall surface of the bent pipe body 1 is reduced.

Preferably, the cross-sectional shape of the arch portion 3 is an equilateral triangle, such as the equilateral triangle structure indicated by B in fig. 3, with a side length L of 4mm and a spacing S between the arch portions 3 of 4mm, which is the optimal surface morphology size.

Preferably, the V-shaped groove 2 is disposed on the outer curved wall of the elbow body 1, so that fluid in the elbow body 1 passes through the turning position of the elbow body 1, that is, erosion occurs on the inner wall surface of the outer curved wall, and the V-shaped groove 2 disposed on the outer curved wall can reduce the collision speed of particles, thereby effectively reducing the kinetic energy of the collision between the particles and the outer curved wall, further reducing the erosion of the particles to the inner avoidance surface of the outer curved wall of the elbow body 1, and prolonging the service life of the elbow body 1.

Specifically, in connection with the accompanying drawings, it can be considered that: the V-shaped groove 2 and the arch 3 are integrally formed, and in the bent pipe body 1, a half of the side wall provided with the V-shaped groove 2 (i.e., having the arch 3) is an outer curved wall, as indicated by the J position. Half of the side walls where the V-shaped groove 2 is not provided (i.e. where the arched portion 3 is not provided) are inner curved walls, as indicated by the position I in the figure.

Preferably, as shown in fig. 6, the annular angle W of the V-shaped groove is 180 °, covering half of the elbow body 1 in the annular direction, i.e. covering the outer curved wall of the elbow body 1. The particles flowing in the bent pipe body 1 are subjected to the action of centrifugal force, and erosion mainly occurs at the turning part of the bent pipe body 1, namely the outer bent wall of the bent pipe body 1, as shown by the position marked J in the figure; the opposite side of the turning point, namely the inner curved wall of the bent pipe body 1, is basically not eroded as shown by the position I in the figure, so that only the turning point of the bent pipe body 1 is required to be subjected to structural change, and the structural change is effective in resisting erosion at the turning point of the bent pipe body 1. The V-shaped groove 2 covers half of the bent pipe body 1 along the annular direction, which is beneficial to playing a comprehensive anti-erosion protection role on the turning part of the bent pipe body 1. In addition, the effect of the V-shaped groove 2 covering the whole of the bent pipe body 1 in the annular direction or the effect of the V-shaped groove 2 covering more than half of the bent pipe body 1 in the annular direction is not greatly different from the effect of the V-shaped groove 2 covering half of the bent pipe body 1 in the annular direction, and the V-shaped groove 2 covering half of the bent pipe body 1 in the annular direction is more material-saving, and the manufacturing difficulty is reduced. Considering the impact erosion effect and the energy consumption requirement in combination, it is preferable that the V-shaped groove 2 covers half of the elbow body 1 in the annular direction.

In the embodiment, the diameter of the bent pipe body 1 is 50mm, and the gas-solid two-phase flow in the bent pipe body 1 is air and sand respectively. The density of the air was 1.18kg/m ³ Viscosity 1.8X10 ^-5 Pa.s, flow rate of 30m/s, sand density of 2650kg/m ³ The particle size was 100 μm in a single particle size, the particle mass flow rate was 0.02kg/s, and the inlet velocity was the same as the continuous phase air flow rate. Compared with the common bent pipe, the bent pipe with the V-shaped groove 2 structure has the advantage that the erosion resistance is improved by 41.5%.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (5)

1. The utility model provides an elbow, includes elbow body (1), its characterized in that:

the inner wall surface of the bent pipe body (1) is recessed with a V-shaped groove (2) extending along the circumferential direction, and the cross section of the V-shaped groove (2) is of an equilateral triangle; the V-shaped groove (2) is only arranged on the outer curved wall of the bent pipe body (1).

2. The elbow according to claim 1, wherein:

the V-shaped grooves (2) are distributed uniformly along the length direction of the bent pipe body (1).

3. The elbow according to claim 2, wherein:

the bent pipe body (1) is outwards arched by the wall surface of the V-shaped groove (2), and then an arched part (3) protruding out of the outer wall surface is formed.

4. A bent pipe according to claim 3, wherein:

the cross section of each arch part (3) is in an equilateral triangle shape, the side length of each arch part is 4mm, and the distance between the two arch parts (3) is 4mm.

5. The elbow according to claim 4, wherein:

the annular angle of the V-shaped groove (2) is 180 degrees.

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