JPH0562271B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a cylindrical body with a thin-walled inner cylinder used in a high-pressure vessel.

[Conventional technology]

As shown in FIG. 3, the high-pressure container of the hydrostatic pressurization device includes a cylindrical body 10 forming the main body of the high-pressure container 1;
0 is an upper lid that is inserted into the upper part of the cylindrical body 10 and is equipped with a gasket 21 for sealing the inside of the container 1a;
Reference numeral 30 denotes a lower lid to which a gasket 21 is inserted and fixed to the lower part of the cylindrical body 10 and seals the inside 1a of the container, and 40 supports the upper lid 20 and the lower lid 30 which receive vertical pressure inside the container 1a. It is a yoke frame with a mouth shape. The cylindrical body 10 of the high-pressure vessel 1 configured as described above is provided with an outer cylinder 10 as a cylindrical body main body as a means for corrosion resistance and mitigation of cross cutting.
Thin-walled inner cylinder 1 made of ductile material that can be replaced inside of 2.
1 is provided.

The fitting structure between the inner surface of the outer cylinder 12 and the outer surface of the thin inner cylinder 11 is shown in FIGS. 4 and 5. Referring to FIG. 4, the fitting surfaces of the outer cylinder 12a and the thin inner cylinder 11a are parallel to the axial direction. In this case, the outer cylinder 12a
When inserting the thin-walled inner cylinder 11a into the housing, a gap of 2/100 mm or more between the insertion surfaces is required. FIG. 5 shows a case where the fitting surfaces of the outer cylinder 12b and the thin inner cylinder 11b are tapered.

[Problem that the invention seeks to solve]

When using the above-mentioned conventional cylindrical body in a high-pressure vessel, the following problems arose.

1 When using a cylindrical body in which the fitting surfaces of the outer cylinder and thin-walled inner cylinder are parallel to the axial direction, (a) For example, 40 ^ID ×
If there is a 2/100mm gap between the thin inner cylinder of 50 ^OD and the outer cylinder of 50 ^ID × 50 ^OD , the stress will increase by Δδθ = 2/100 × 2/50 × 2. ¹ × 10 ⁴ = 16.8 Kgf/mm ² .

This may significantly worsen fatigue strength.

(b) The sealing performance of the gasket deteriorates because the gasket easily bulges due to the gap.

(c) Since the generated stress is large, it will be extremely difficult to replace the thin inner cylinder if it becomes permanently deformed.

2. When using a cylindrical body in which the fitting surfaces of the outer cylinder and thin inner cylinder are tapered, (a) machining of the fitting surfaces is difficult. (b) It is difficult to replace the thin inner cylinder.

[Means for solving problems]

In order to solve the above problems, the present invention (1) uses a material for the thin inner cylinder that is slightly longer than the cylindrical body.

(2) The flanges arranged at both axial ends of the cylindrical shell are fixed to the cylindrical shell body.

(3) The thin-walled inner cylinder is compressed between both flanges, and the inner surface of the outer cylinder and the outer surface of the thin-walled inner cylinder are in close contact. The cylindrical body is characterized by the above structure.

[Effect]

Since the cylindrical body of the high-pressure container according to the present invention is constructed as described above, when used as a high-pressure container, the thin-walled inner cylinder receives axial force during elastic deformation, and the inner surface of the outer cylinder and the outer surface of the thin-walled inner cylinder are in close contact with each other. This reduces stress in the circumferential direction compared to the conventional case with a gap, and by loosening the bolts and removing the flange, the axial force is removed and the diameter of the thin-walled inner cylinder becomes smaller, allowing the thin-walled inner cylinder to be separated from the outer cylinder. It can be extracted.

〔Example〕

One embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Components that are the same as those in the conventional device are designated by the same reference numerals and repeated explanations will be omitted. 10C is a cylindrical body forming the main body of the high pressure vessel 1. The cylindrical body 10c includes an outer cylinder (cylindrical body) 12c, a thin inner cylinder 11c inserted into the outer cylinder 12C, and flanges 1 provided above and below to cover the upper and lower ends of the outer cylinder 12c and the thin inner cylinder 11c.
3. This structure is made up of bolts 14 that screw the flange 13 onto the outer cylinder 12c.

The outer cylinder (cylindrical body) 12c is made of a high-strength material with a high Young's modulus such as superalloy or SKH51 when used alone.
In the case of multilayers, it is a combination of ductile strength materials such as SKD61 and SUS630, superalloys, and high Young's modulus and high strength materials such as SKH61.

The thin inner cylinder 11c is slightly longer than the outer cylinder 12c.
It is a ductile strength material such as SKD61 or SUS630. The flange 13 is fixed to the outer cylinder 12c with several bolts 14.

In the cylindrical body 10c and the high-pressure vessel 1 having the above configuration, the thin inner cylinder 11c is longer in the longitudinal direction than the outer cylinder 12c by l, so by tightening the flange 13 to the outer cylinder 12c with the bolts 14, the axial force can be reduced. Receive and compress. For example, if a compressive stress of 50 kg/mm ² is applied to the thin inner cylinder 11c, the stress increases by 0.018 mm in the radial direction.

(Δγ=νσc/E×γ=0.3×50/2. ¹ ×10 ⁴ ×25=
(0.018 mm) The outer surface of the thin inner cylinder 11c compressed by the axial force is completely brought into close contact with the inner surface of the outer cylinder 12c. As shown in Fig. 2, the thin-walled inner cylinder 11c receives the axial force.
When the cylindrical body 10c with no gap between the cylindrical body 1c and the outer cylinder 12c is used in the high-pressure vessel 1, an increase in stress in the circumferential direction of the thin inner cylinder 11c can be prevented. Also, the thin inner cylinder 11c
Since the thin inner cylinder 11c is subjected to compressive stress in the axial direction, it is possible to prevent the thin inner cylinder 11c from being cut into rings due to the axial stress.

Since the thin-walled inner cylinder 11c is compressively deformed within the elastic deformation, by loosening the bolt 14 and removing the axial force of the thin-walled inner cylinder 11c when replacing it, a gap is created between the thin-walled inner cylinder 11c and the outer cylinder 12c. It can be easily removed.

〔Effect of the invention〕

As described in detail above, the present invention has a structure in which the cylindrical body is provided with a thin-walled inner tube, the thin-walled inner tube is compressed to the extent of elastic deformation, and the inner surface of the cylindrical body body and the outer surface of the thin-walled inner tube are in close contact with each other. When used in high-pressure vessels, compared to conventional cylindrical shells, (1) There is no gap between the fitting surface of the cylindrical shell body and the thin inner cylinder, so the stress in the circumferential direction is small and the fatigue strength does not deteriorate significantly. .

(2) When the fixing means of the thin-walled inner cylinder is removed and the axial force from the flange is removed, the diameter becomes smaller and it can be easily removed from the cylindrical body.

(3) The thin-walled inner cylinder receives axial force and can reduce axial tensile stress, making it safe for round cutting.

(4) When pressure is applied inside the high-pressure container, since the thin-walled inner cylinder and the cylindrical body are in close contact with each other, the thin-walled inner cylinder is not formed as in the past, and the sealing performance inside the container is reduced. Retained by packing,
In addition, there is less damage to the packing and its lifespan is extended.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a cylindrical body of a high-pressure container of the present invention, FIG. 2 is a vertical cross-sectional view of a high-pressure vessel in which the cylindrical body of the present invention is applied to a high-pressure vessel, and FIG. A vertical cross-sectional view showing a high-pressure container. Figure 4 is a vertical cross-sectional view of a conventional cylindrical body with a gap between the thin-walled inner cylinder and the cylindrical body. Figure 5 is a vertical cross-sectional view of a conventional cylindrical body with a thin-walled inner cylinder and the cylinder body. It is a longitudinal cross-sectional view when the insertion surface of the trunk body is tapered, 1... high pressure container, 1a... inside the container, 10c...
...Cylindrical body, 11c...Thin inner cylinder, 12c...Outer cylinder (cylindrical body), 13...Flange, 14...Bolt, 20...Top lid, 21...Putskin, 30...
Lower lid, 40... is a yoke frame.

Claims (1)

[Scope of Claims] 1. A cylindrical shell used for a high-pressure container such as a hydrostatic pressurizing device, comprising: a cylindrical body; and a thin inner cylinder inserted into the cylindrical body and slightly longer than the cylindrical body; A flange is provided to cover both ends of the cylindrical body and the thin-walled inner cylinder, and the flange is fixed to the cylindrical body and the thin-walled inner cylinder so that the thin-walled inner cylinder is compressed during elastic deformation and is brought into close contact with the cylindrical body. A cylindrical body of a high pressure vessel characterized by comprising: