JPH0453640B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to high pressure vessels.

In recent years, ultra-high pressure containers, or hydrostatic pressurization devices, have
Since the internal pressure is as high as 3000 to 5000 kg/cm ² and it is used as production equipment, a fatigue life of 10 ⁵ or more is now required.

However, the pump piping pressurization system to generate such high pressure is extremely expensive, and the pressure vessels also have to rapidly increase in wall thickness in order to withstand ultra-high pressures of 3000 kg/cm ² or more, requiring fatigue design. Unless this is done, even if the outer-inner diameter ratio is 3 to 4 or more, the stress generated on the inner surface of the pressure vessel will be extremely large, and the life of the pressure vessel will be extremely short to 10 ³ or less.

Therefore, a prestressing method has been used in which high compressive residual stress is generated in advance on the inner surface of the pressure vessel using the shrink fit method or ^self -stressing method. Even in the conventional method, in order to obtain high compressive residual stress, it is necessary to increase the shrink fit allowance, and in practice this can only be achieved within a relatively narrow range, and the shrink fit process is extremely difficult. It is also difficult to confirm the effectiveness.

The present invention was proposed in view of the above circumstances, and aims to provide an ultra-high pressure vessel with a long fatigue life and high safety. a stepped piston that fluid-tightly fits into a large diameter hole and a small diameter hole of the cylindrical member; a lid that closes both ends of the cylindrical member; and a piston fitting side of the cylindrical member. and means for supplying a pressure medium between the lid of the piston and the end surface of the large diameter portion of the piston.

An embodiment of the present invention will be explained with reference to the drawings.
Fig. 1 is a longitudinal sectional view of the same, Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is a longitudinal sectional view showing a modification of Fig. 1, and Fig. 4 is a model showing the principle of the present invention. It is a diagram.

First, in Figures 1 and 2, 1 is an outer cylinder, 2 is an inner cylinder slidably inserted into the outer cylinder 1, and a cylindrical gap 11 is provided between the two through which the pressure medium is introduced. It is filled with a pressure medium, and its upper and lower parts are sealed with packings 20 and 21.
5 is a lower lid; 3 is an upper lid having a cylindrical protrusion on the axis; a pressure booster piston 4 is suspended below it by a mounting bolt 22; The upper end of the insertion hole for the mounting bolt 22 is sealed by a plug 23. Reference numeral 7 designates a pressure medium supply/discharge port drilled on the axis of the upper lid 3, and a check valve 12 (described later) is provided at the supply/discharge port on the pressure increasing piston 4 side that communicates with this pressure medium supply/discharge port. 6 is an overflow port, 8 and 9 are pressure medium introduction and discharge passages, 15, 16, 17, 18, and 19 are gaskets, and 13 is a drain hole drilled in the lower lid 5.
14 is a drain valve provided outside the drain hole 13.

Next, to describe the structure of the check valve 12, in FIG. 2, 12a is a cylindrical valve body, 12b is a seat holder, 12c is a valve seat, 12d is a ball;
e is the ball holder, 12f is the spring, 12
g and 12h are gaskets, respectively, and the valve body 12a
is incorporated into the pressure booster piston 4 from the bottom with a screw,
When the pressure booster piston 4 and the upper lid 3 are in contact with each other at the contact surface 10, the valve push rod 3a protrudes from the supply port 7 into the check valve 12, pushes down the ball 12d, and the check valve is opened. When the pressure piston 4 moves downward, the ball 12d is pressed against the valve seat 12c by the spring 12f, and the check valve 12 is closed.

The modification of FIG. 1 shown in FIG. 3 is roughly the same as that in FIG. Not provided. 24 is a remote control valve provided outside the lower drain.

The high-pressure container shown in FIGS. 1 and 3 supports the axial force using a roughly window frame-shaped press frame (not shown), screw type, yoke frame type, etc. when pressurized at high pressure.
The upper and lower lids are designed to prevent them from falling out.

The effects of such a device are as follows.

(1) Remove the pressure booster piston 4 and the upper lid 3, supply pressure medium to the inside of the inner cylinder 2, and overflow from the overflow port 6 to fill the inner cylinder 2.

(2) Fit the pressure booster piston 4 and the upper lid 3 into the upper part of the container at the same time. At this time, the excess pressure medium in the container is discharged to the outside through the supply and discharge port 7 when the valve pusher rod 3a pushes down the ball 12d of the check valve 12 to open the check valve in FIG. In the figure, the remote control valve 24 is opened in conjunction with the insertion of the upper lid, and the air is discharged to the outside from the drain hole 13 in the same way, and air in both cases is completed at the same time as the pressure booster piston 4 and the upper lid 3 are inserted. do.

(4) When the pressure medium is supplied from the supply port 7 with the upper and lower surfaces of the pressure vessel supported by the press frame, the pressure medium passes through the introduction and discharge passages 8 and 9 to the inner and outer cylinders. The gas is supplied to the gap 11 between them, and the pressure in that area increases.

(4) At the same time, the pressure medium is introduced into the gap 10 between the pressure booster piston and the upper cover, so the pressure booster piston 4 receives the pressure of the pressure medium on its top surface, increases the gap 10, and is pushed downward. That is, the pressure inside the inner cylinder is increased by the pressure increasing piston.
Here, if the upper pressure receiving area of the pressure intensifying piston is A ₁ and the lower pressure receiving area is A ₂ , and the pressure of the pressure medium is P ₁ (A ₁ > A ₂ ), then inside the inner cylinder there is P ₂ = A ₁ / A pressure of A ₂ P ₁ is obtained.

(5) At this time, in FIG. 1, the internal pressure is maintained by the check valve 12 acting as the pressure booster piston 4 descends, and in FIG.
Pressure is maintained when the valve is closed.

(6) When the pressure medium is discharged from the supply/discharge port 7, the pressure inside the gap 10 decreases, the pressure inside the inner cylinder raises the pressure booster piston 4, the pressure inside the inner cylinder also decreases, and at the same time the pressure inside the inlet/discharge passage decreases. Since the pressure medium is discharged through 8 and 9, the pressure in the gap 11 also decreases.

According to such a device, the following effects can be achieved.

(1) By increasing the pressure inside the inner cylinder with a pressure booster piston to obtain ultra-high pressure, and at the same time introducing a pressure medium into the gap between the inner cylinder and outer cylinder, even if the internal pressure is high, it can be supported by the external pressure. As a result, the stress generated in the inner cylinder is reduced, and the life of the high-pressure vessel is significantly extended.

In other words, compared to the case where an internal pressure P ₁ ' is applied to a high-pressure vessel of a single structure with the same inner diameter and the same outer diameter, in the present invention, as shown in FIG.
P ₂ ′ (P ₂ ′<P ₁ ′) is applied, so the stress generated in the inner cylinder 2 is reduced, and the stress generated in the outer cylinder 1 is lower because the pressure P ₂ ′ is low, and the stress of the container is reduced as a whole. The generated stress can be reduced, which increases the fatigue life of the high-pressure vessel and improves safety.

(2) The inner cylinder is removable, and when used at less than the capacity of the pressurizing system, a large-diameter seat attachment can be attached to the pressure booster piston and the outer cylinder alone can be used at a large capacity. .

(3) It is possible to bleed air from the container at the same time as inserting the pressure booster piston and the upper lid, and the operability is as easy as that of a normal high-pressure container, and there are no special parts.

In short, according to the present invention, there is provided a cylindrical member having a large-diameter hole and a small-diameter hole, a stepped piston that fits fluid-tightly into the large-diameter hole and the small-diameter hole of the cylindrical member, and the cylindrical member. and means for supplying a pressure medium between the lid on the piston fitting side of the cylindrical member and the end surface of the large diameter portion of the piston, The present invention is extremely useful industrially because it provides an ultra-high pressure container with high safety.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, FIG. 3 is a longitudinal sectional view showing a modification of FIG. 1, and FIG. FIG. 1 is a model diagram showing the principle of the present invention. 1... Outer cylinder, 2... Inner cylinder, 3... Upper lid,
3a... Valve push rod, 4... Pressure increase piston, 5...
Lower lid, 6... Overflow port, 7... Pressure medium supply/discharge port, 8, 9... Pressure medium introduction/discharge passage, 10... Contact surface, 11... Gap, 12...
Check valve, 12a...Valve body, 12b...Seat holder, 12c...Valve seat, 12d...Ball, 1
2e... Ball holder, 12f... Spring, 12g, 12h... Packing, 13... Drain hole, 14... Drain valve, 15, 16, 17, 1
8, 19...Packing, 20,21...Packing, 22...Mounting bolt, 23...Plug, 24
...Remote control valve.

Claims (1)

[Claims] 1 A cylindrical member having a large diameter hole and a small diameter hole,
a stepped piston that fluid-tightly fits into a large-diameter hole and a small-diameter hole of the cylindrical member; a lid that closes both ends of the cylindrical member; a lid on the piston-fitting side of the cylindrical member; and the piston. and a means for supplying a pressure medium between the large-diameter end face of the high-pressure vessel.