JP2505126B2 - Abrasion resistant double tube - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear resistant double pipe used for transportation of powder or slurry.

[0002]

2. Description of the Related Art Conventionally, this type of wear-resistant double pipe has been constructed such that a wear-resistant inner pipe made of ceramic or high chromium cast steel is held between pressure-resistant outer pipes made of carbon steel or the like. Or a filler similar to this (see Japanese Patent Publication No. 2-52569), or the outer tube is squeezed by reducing its diameter to bring it into a tightly connected state with the inner tube (Japanese Patent Laid-Open No. 1-52169). 118309).

[0003]

However, in the above-mentioned conventional wear-resistant double pipe, the inner pipe is made of a hard and brittle material such as ceramic, and therefore, when shock or vibration is applied to the outer pipe, it passes through the filler. Alternatively, there is a problem that a shock or the like is directly applied to the inner pipe and the inner pipe is damaged. In addition, there is a problem that heat from the transported material is transferred to the outer pipe made of carbon steel or the like through the filler or directly and the heat resistance is deteriorated. Therefore, an object of the present invention is to provide a wear-resistant double pipe which can prevent damage to the inner pipe and has excellent heat resistance.

[0004]

In order to solve the above-mentioned problems, the first wear-resistant double pipe of the present invention comprises a wear-resistant inner pipe and a pressure-resistant outer pipe, and a longitudinal direction of both pipes. A plurality of springs that are wave-shaped in the direction
It is locked by a groove and elastically mounted at equal intervals in the circumferential direction of both tubes. The second wear-resistant double pipe is provided with a plurality of springs having a V-shaped cross section or a coil shape that is ring-shaped in the circumferential direction of both pipes between the wear-resistant inner pipe and the pressure-resistant outer pipe. ,
Circumferential grooves provided on the outer circumference of the inner pipe or circles scattered in the circumferential direction
It is locked by a concave portion and is elastically mounted at equal intervals in the longitudinal direction of both tubes. The third wear-resistant double pipe is the first
Alternatively, in the second wear-resistant double pipe, a granular heat insulating material is loaded between the inner pipe and the outer pipe. The fourth wear-resistant double pipe is the same as the first or second wear-resistant double pipe,
A fibrous heat insulating material is loaded between the inner tube and the outer tube.

[0005]

In the first and second means, shocks and vibrations applied to the outer pipe are absorbed and relaxed by the respective springs and applied to the inner pipe , and the springs move.
But Ru is prevented. In addition, in the third and fourth means, in addition to the same operation as the first and second means, the heat transfer from the transported material to the inner pipe to the outer pipe is blocked by the heat insulating material. It

As the granular heat insulating material, particles of SiO ₂ (silica), Al ₂ O ₃ , SiO and other ceramics are used, and as the fibrous heat insulating material, SiO _{2 is also used} .
It is preferable to use a ceramic fiber such as Al ₂ O ₃ . The amount of each heat insulating material loaded is an amount that allows elastic deformation of each spring.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. 1 and 2 are a longitudinal sectional view and a transverse sectional view of a wear resistant double pipe of a first embodiment of the present invention. This wear-resistant double pipe is used as a transport pipe for pneumatically transporting silica sand, and has a wear-resistant inner pipe 1 made of ceramics such as Al ₂ O ₃ and ZrO ₂ and a pressure-resistant inner pipe made of carbon steel and the like. As shown in FIGS. 1 to 3, a plurality of springs 3 having a corrugated shape in the longitudinal direction of both tubes 1 and 2 are provided between the outer tube 2 and the outer tube 2.
It is mounted at equal intervals in the circumferential direction of 2.

Each spring 3 is provided with a height (wave height) in the natural state of about 1.2 to 1.5 times the average clearance between the inner pipe 1 and the outer pipe 2, and both pipes have the same height. One, two
4 and 5 in order to prevent movement in the circumferential direction between
As shown in FIG. 1, the longitudinal groove 4 provided on the outer peripheral surface of the inner pipe 1
A part of which is engaged.

Between the inner pipe 1 and the outer pipe 2 is an inner pipe.
In order to prevent the outer tube 2 from deteriorating due to the heat from the transported material flowing in 1 , the SiO ₂ (silica sand), Al ₂ O ₃ ,
Granular heat insulating material 5 made of ceramics such as SiC (see FIG. 2).
(Refer to FIG. 3) is loaded in an amount that allows elastic deformation of each spring 3.

[0010] In the wear double tube having the above structure, when an impact or vibration is applied to the outer tube 2, the impact absorption etc. by the springs 3 is added is relaxed to the inner tube 1, or
One movement of the spring is prevented Runode can inner tube 1 made of a ceramic is hard and brittle material is prevented from damage, and absorbing, the relaxation effect in holding for a long period of time
Can Ru. Further, since the heat transferred to the inner pipe 1 from the transported material flowing in the inner pipe 1 is blocked by the granular heat insulating material 5, it is possible to prevent the outer pipe 2 from being deteriorated due to the heat and to improve the heat resistance. It can be excellent.

FIG. 6 is a longitudinal sectional view of a wear resistant double pipe of a second embodiment of the present invention. This wear-resistant double pipe is also used as a transport pipe for pneumatically transporting silica sand, and includes a wear-resistant inner pipe 6 made of ceramics such as Al ₂ O ₃ and a pressure-resistant outer pipe 7 made of carbon steel or the like. In between, a plurality of springs 8 having a V-shaped cross section, which form a ring shape in the circumferential direction of both pipes 6 and 7,
The tubes 6 and 7 are elastically mounted at equal intervals in the longitudinal direction.

As shown in FIG. 7, each spring 8 is formed by bending a hoop-shaped leaf spring having a large number of cuts 9 on one side into a dogleg shape, and as shown in FIG. The inner pipe 6 is provided in a ring shape so as to be on the side. The inner pipe 6 is provided between the inner pipe 6 and the outer pipe 7.
In order to prevent the outer tube 7 from deteriorating due to heat from the transported goods flowing inside, as shown in FIG. 9, SiO ₂ , Al
_A fibrous heat insulating material 10 made of ceramic fiber such as ₂ O ₃ is loaded in an amount that allows elastic deformation of each spring 8.

The ring-shaped spring 8 is not limited to the V-shaped cross section, but a plurality of coil-shaped springs are arranged at equal intervals in the circumferential direction so as to form a ring shape. Good. In these cases, it is preferable to provide a circumferential groove or a circular recess on the outer peripheral surface of the inner pipe 6 to prevent the spring from moving, as in the first embodiment.

Therefore, according to the wear resistant double tube having the above structure, the same operational effect as that of the first embodiment can be obtained.

In each of the above embodiments, the inner pipe 1,
Although the case where 6 is made of ceramics has been described, the present invention is not limited to this, and the inner pipes 1 and 6 may be made of, for example, high chromium cast steel or cast iron having excellent wear resistance.

The heat insulating material in the first embodiment may be fibrous, and the heat insulating material in the second embodiment may be granular.

[0017]

As described above, the first and second aspects of the present invention
According to wear double pipe, absorbed by impact or vibration the respective spring applied to the outer tube, was added to the relaxed to the inner tube, and prevents movement of the spring Runode,
Can the inner tube to prevent damage, breakage can be prevented, such as caused by distortion due to the difference in Matanetsu expansion, Katsuko
Ru can hold over these effects to a long period of time. Further, according to the third and fourth wear resistant double pipes, in addition to the same effect as the first and second wear resistant double pipes, the outer pipe of the heat transferred from the transported object to the inner pipe Since heat conduction to the outer tube is blocked by the heat insulating material, it is possible to prevent the outer tube from deteriorating due to heat, and it is possible to make the wear-resistant double tube excellent in heat resistance.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a wear-resistant double pipe according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the wear resistant double pipe of the first embodiment of the present invention.

FIG. 3 is a perspective view of a spring used in the wear resistant double pipe of FIG.

FIG. 4 is a side view in which a part of an inner pipe used for the wear resistant double pipe of FIG. 1 is omitted.

5 is a cross-sectional view of an inner pipe used for the wear resistant double pipe of FIG.

FIG. 6 is a vertical sectional view of a wear resistant double pipe of a second embodiment of the present invention.

FIG. 7 is a perspective view showing a state in which a spring used in the wear resistant double pipe of FIG. 6 is being formed.

8 is a perspective view of a spring used in the wear resistant double pipe of FIG.

9 is an enlarged cross-sectional view of a main part of the wear resistant double pipe of FIG.

[Explanation of symbols]

 1 Inner tube 2 Outer tube 3 Spring 5 Granular heat insulating material 6 Inner tube 7 Outer tube 8 Spring 9 Fibrous heat insulating material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-172616 (JP, A) JP-A-52-71564 (JP, A)

Claims (4)

(57) [Claims] 1. A plurality of springs having a corrugated shape in the longitudinal direction of both pipes are provided between a wear-resistant inner pipe and a pressure-resistant outer pipe by a longitudinal groove provided on the outer periphery of the inner pipe. A wear-resistant double pipe characterized by being locked and mounted at equal intervals in the circumferential direction of both pipes. 2. A plurality of springs having a V-shaped cross section or a coil shape, which form a ring shape in the circumferential direction of both pipes, are provided between the wear-resistant inner pipe and the pressure-resistant outer pipe, and the outer periphery of the inner pipe. Around
A wear-resistant double pipe, characterized in that it is mounted by means of facing grooves or circular recesses scattered in the circumferential direction and mounted at equal intervals in the longitudinal direction of both pipes. 3. The wear resistant double tube according to claim 1 or 2, wherein a granular heat insulating material is loaded between the inner tube and the outer tube. 4. The wear resistant double pipe according to claim 1, wherein a fibrous heat insulating material is loaded between the inner pipe and the outer pipe.