JPS5978800A - High pressure vessel - Google Patents

Abstract

PURPOSE:To reduce the pushing stroke of a boosting piston and to increase the effective area of a boosting vessel by feeding pressurized water only into the boosting vessel up to a primary pressure thereby performing the compression of a raw material. CONSTITUTION:A high pressure vessel A has a cylindrical boosting vessel 1 which can be forced into the body of the high pressure vessel and is suspended from a top cover B. A boosting piston 2 having the pressure receiving area on the body side of the vessel A larger than the pressure receiving area on the vessel 1 side is inserted axially movably in the upper opening of the vessel 1. A feed passage for a fluid is provided in the vessel 1, and a passage for communicating the inside of the vessel 1 and the vessel A is provided. A pressure regulating valve 9 which is set at a prescribed pressure is interposed in said passage. The pushing stroke of the piston 2 is thus shortened and the effective area of the vessel is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-pressure container for a cold isostatic press apparatus for compression molding powder.

Hydrostatic pressurization equipment that compresses and molds high-pressure processed raw materials using a pressure medium uses either a screw type or a frameless frame type, but the former has problems with the fatigue strength of the threaded part, and In cases where the operation of attaching and detaching trays is complicated and high productivity is required, in recent years H
.

The turgor pressure is extremely high. In order to maintain such ultra-high pressure, it is necessary to increase the wall thickness (inner diameter ratio) of the high-pressure container, but if the internal pressure is high, even if the outer-inner diameter ratio is 6 to 4 or more, the high pressure will not increase. They are less effective in reducing the stress generated on the interior surface of the vessel, and this high stress results in a limited useful life of the high pressure vessel. Conventionally, as a countermeasure to this problem, methods such as shrink fitting have been used to impart compressive residual stress to the inner surface of the high-pressure container, but there are limits to their effectiveness at ultra-high pressures.

To deal with this, a pressure intensifying vessel is arranged inside the high pressure vessel main body, and the pressure receiving area on the high pressure vessel main body side is larger than the pressure receiving area on the pressure intensifying vessel side through a hole opened in the high pressure vessel main body provided in the same pressure intensifying vessel. The pressure intensifier piston is configured by pushing a larger pressure intensifying piston so as to be able to move in the axial direction, and the pressure intensifying piston is moved toward the pressure intensifying container side under the load of the pressure medium in the high pressure vessel main body.

A device has been proposed in which an even higher pressure can be obtained at the bottom of the pressure intensifying container.

However, in such a device, a relatively large amount of water is required to increase the pressure inside the pressure intensifier container (the push stroke of the pressure intensifier piston to increase the pressure), so the effective volume that can accommodate the object to be processed must be increased (unable to There were drawbacks.

In view of the above-mentioned problems, the present invention aims to shorten the pushing stroke of the pressure booster piston and increase the effective area of the pressure booster container.

Examples of actual guns according to the present invention will be explained below based on the drawings.

FIG. 1 is a longitudinal cross-sectional view of a high-pressure container, and FIG. 2 is a process diagram of cold isostatic pressurization using this high-pressure container. In the figure, A is the main body of the high-pressure vessel into which this pressure booster vessel has been introduced, and B is directly above the high-pressure vessel body A.

A water supply and drainage port C is provided in the lid. 1 is a pressure booster vessel, 3
is the pressure booster container cover, which is screwed together into one unit. Furthermore, the pressure intensifier cover 3 is attached to the pressure intensifier container mounting bracket D.
Therefore, after the high-pressure vessel upper lid BIC is attached, the pressure intensifier vessel is suspended from the upper lid. Reference numeral 6 denotes a pressure boosting piston guide, which is attached to the lower part of the water supply/drainage port C of the upper cover B as one unit by fastening screws. 2 is a pressure boosting piston;
Booster container cover 3. The pressure booster slides along the pressure booster υ guide 6, airtightly attaches to the pressure booster container 1 by the shield 10, and moves downward under pressure on the upper surface. 21 is a gas phase section.

This is done so that it does not become a resistance to the movement of the pressure boosting piston 2.

11.12, 13.14 and 15 are paras.

The pressure booster piston guide B has a water supply and drainage port 6a, and a check valve 7 is installed in the lower part. Reference numeral 5 denotes a valve push rod whose tip end is inserted into the check valve from the upper part through the water supply and drainage port 6a, and when 5 is pushed down, the check valve 7 is opened. 2a is a drainage passage, 2b is a water supply passage, and each passage is provided with a check valve 8. A pressure regulating valve 9 is incorporated and interposed in the pressure increasing piston 2. The pressure regulating valve 9 is set below the maximum pressure of high pressure water.

Reference numeral 4 denotes a raw material receiving seat, which has a lattice structure and is attached to the pressure intensifying vessel 1 in a structure that allows it to be easily attached and detached. Reference numeral 16 denotes a pressure booster container seat, which is attached to the bottom of the high pressure container A with bolts 20, and a ballast 18 hermetically seals the bottom of the pressure booster container 1.

17.19 is also a snap.

Reference numeral E denotes a drain hole provided in the lower part of the high-pressure vessel A, and a high-pressure gate valve (not shown) is attached to the outside.

When the pressure is increased, the acid part is exposed to the same high pressure as inside the pressure intensifier container 1, so if a pressure detector is installed outside the drain, the pressure in the pressure intensifier container 1 will be increased.
Internal pressure can be detected.

The operation of the high-pressure container having the above structure will be explained based on the cold isostatic pressurization process (FIG. 2) using this high-pressure container.

f,) The pressure booster vessel 1 is suspended below the upper fin of the high pressure vessel A, and is located above by the loading/unloading device rit, L together with the upper part fB. At this time, the water supply and drainage port C is connected to the water supply and drainage shaft (
(not shown) is inserted, the valve push rod 5 is pushed downward, and the check valve 7 is opened. In addition, the high-pressure treated raw material F is placed on the upper part of the raw material receiver 4 and placed on the receiver G.
It is sorted.

+bl Lower the pressure intensifier container 1 and attach the catch seat 4.

(Insertion of raw materials) tcJ Lift the pressurized container 1 upwards along with the raw material F inside.

tdl Move the high pressure volume aA below the pressure booster vessel 1.

There is an arbitrary amount of water in the high pressure vessel A.

- Buff O- using the buffing spout.

There is a large amount of water inside the container. In addition, since the bottom of the pressure intensifying container 1 is open, water flows in, and at the same time water flows into the water supply and drainage port 6a from the check valve 7, which is opened by the valve rod 5.
Air is vented through C and C.

(l) Further, the pressure intensifier container 1 is lowered and the bottom part is fitted into the pressure intensifier container seat 16 to seal it. At the same time.

The upper lid B is fitted onto the upper part of the high-pressure container A in an air-tight manner.

At this time, the air and excess water in the high-pressure container A are discharged to the outside through the check valve 8→drainage passage 2a-) water catchment hole 6a→drainage port C as the upper lid B is lowered. This is 5K
At the same time as the lids are fitted, filling the pressure vessel 1 and pressure vessel A with water and removing air is completed.

tgl Upper part [Separate B and the loading/unloading device. At this time, the water supply and drainage shaft (not shown) is pulled out from the water supply and drainage port C,
The valve body and valve pusher are raised upward by the spring ring inside the check valve 7, and the valve 7 is closed. Subsequently, the high-pressure container Φ is moved into the press frame, a pressurized water injection shaft (not shown) is inserted into the first supply and drain port C, and high-pressure water is fed to pressurize the container.

At this time, the injection shaft is inserted to a depth that does not hit the valve push rod 5, so that the check valve 7 is not opened.

(h) At the primary pressure (below the set pressure of the pressure regulating valve 9), pressurized water is sent only into the pressure increasing container 1 by the pressure regulating valve 9, and the raw material F is compression-molded. When the pressure rises further, the pressure regulating valve 9 opens, resulting in a high pressure capacity! High pressure water also flows into the inside of A and is pressurized. Due to the balance of pressure inside and outside the pressure intensifier container 1, the pressure intensifier piston 2 receives pressure on the upper surface and is pushed into the pressure intensifier container 1, and the pressure in the pressure intensifier container 1 is increased according to the pressure receiving area ratio of the pressure intensifier piston 2. Ru. At this time, the pressure inside the pressure intensifying container 1 is maintained because the check valve 7 is closed.

+i) When compression molding is completed, the pressurized water is increased to 8 pressures through the check valve. At this time, the pressure boosting piston 2 is pushed upward by the pressure inside the pressure boosting container 1, and the pressure inside the pressure boosting container 1 drops to the set pressure (primary pressure) of the pressure regulating valve 9.

噌lj) Furthermore, the pressure in the KJ/IP pressure responder 1 is lowered to normal pressure.

This is done by inserting the pressurized water injection shaft deeper and pushing down the valve push rod to open the check valve 7. Of course, the pressure can also be lowered by opening the drain hole E.

Below (gl → (f) → (, 1 → (d) → 1C) → tb)
→ Take out the processed raw material in the reverse procedure of t and J.

As explained above, according to the present invention, the raw material is compressed by feeding pressurized water only into the pressure intensifying container up to the primary pressure (below the maximum pressure of pressurized water), so the amount of water required is small, and only the pressure increasing process is required. Compared to the case where pressurization is performed, the required stroke of the piston is significantly less (and the effective volume of the pressure increasing container is increased).

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention. FIG. 2 is a process diagram of cold isostatic pressurization according to the embodiment of FIG. 1. 1... Pressure booster container 2... Group pressure booster piston 4
・・・・・・Raw material receiving seat 6・Old・・Pressure booster piston guide 6a・・・・Supply/drainage port 7・・・・・・Reverse
Stop valve 9... Pressure regulating valve Fig. 1 to+ tb) <C
Schiff Figure 1-2

Claims (1)

[Claims] (1) In the high-pressure container of a cold isostatic pressurizing device, which is busy compressing the object to be processed by a pressure medium, which is charged into the high-pressure container main body, which has upper and lower lids attached to the upper and lower openings of a high-pressure cylinder, the above-mentioned A cylindrical pressure intensifying vessel that can be inserted into the high pressure vessel main body and is suspended from the upper lid, and the upper opening of the pressure intensifying vessel has a pressure receiving area on the high pressure vessel main body side that is larger than the pressure receiving area on the pressure intensifying vessel side. The larger pressure booster piston can be inserted and moved in the axial direction. The present invention is characterized in that a fluid injection path is provided in the pressure intensifier container, and a passage is provided that communicates the inside of the pressure intensifier container and the high pressure container main body, and a pressure w4 regulating valve set to a predetermined pressure is interposed in the passage. High pressure vessel.