JPH02192589A - Static hydraulic hot press device - Google Patents

Abstract

PURPOSE:To prevent the induction of serious accident by a method wherein a space for preventing the scattering of pressure medium gas, leaked out of sealrings to the atmospheric pressure side of the same, is formed and a pressure medium gas leak-out detecting sensor is arranged in the space or at the vicinity of the opening of the space to atmosphere. CONSTITUTION:A cover 16, having an opening 21 communicating with atmosphere, is provided detachably at the atmospheric pressure side of a sealring 14, sealing tightly the joint of an upper lid 10 and a high-pressure cylinder 9 so that leaked gas is not scattered and is released into atmosphere through a space 17, formed by the cover 16, and the opening 21 when the air-tight property of the sealring 14 is damaged and pressure medium gas in the high-pressure vessel leaks out of the same. The leakage of the gas is detected by a gas sensor 15, arranged in the space 17 or at the vicinity of the opening 21.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a hot isostatic pressing device (HIP device) used in a hot isostatic pressing method (HIP method).
For example, it is used to produce a high-density sintered body by compressing a ceramic sintered body at high temperature using high-pressure gas as a pressure medium to crush the pores remaining inside.

(Prior Art) FIG. 6 shows the overall configuration of a conventional HIP device. The first part of the main body pressure vessel is as shown in Fig. 2.
High pressure cylinder 9, opening 9A of the cylinder 9.

It consists of an upper IEIO 5 lower lid 1) that is removably inserted into the 9B, and inside it there is a resistance wire heating type heater 2 placed so as to surround the processing material 15, and heat from the heater 2 is unnecessary. A heat insulating material 3 for preventing the high pressure from being transmitted to the cylinder 9 and the like, a support stand 13 for the processing material 15, and the like are housed.

Heating power to the heater 2 is supplied through a conductive material (not shown) arranged to penetrate the upper cover 0 or the lower cover 1).
It is supplied from the heating power source 5.

The pressure medium gas is supplied from the gas collection device 6 by using differential pressure,
The gas compressor 7 is driven and the pressure medium gas is supplied through an inlet/outlet 12 provided in the upper lid 10 .

The pressure medium gas supplied into the main body pressure vessel 1 is transferred to the high pressure cylinder 9.
The press frame F is engaged with the end surface of the upper lid 10 and the lower M1). It is said to be removable. In FIG. 1, 4 is a water cooling jacket, PG is a pressure gauge, 8 is a pressure reducing regulator, and 23 is an atmosphere release valve.

(Problem B that the invention attempts to solve) In the conventional HIP method, the pressure of the pressure medium gas is usually used as a physical force for compression processing, and the deterioration caused by the reaction of the processing material is To avoid this, inert gases such as argon are often used.

If an inert gas such as argon is used as the pressure gas, even if the pressure gas leaks from the seal ring 14.14A, the amount will not be that large. As long as it does not interfere with achieving the purpose, there is no safety problem at all. During operation, these seal rings 14 and 144 should be actively removed until a leak is detected by a change in the pressure gauge PG. No means were used to detect leakage.

However, in recent years, the number of types of pressure media has been increasing.
For example, it is becoming popular to treat oxide-based superconducting ceramics using a mixture of oxygen, which is a combustion-supporting gas, and an inert gas. In such a pressure medium gas, the mixing ratio of oxygen is high and the pressure is 1000 kg.
When the temperature becomes higher than f/cd, the seal ring 1
If 4,14A is an organic substance, there is a problem that if the temperature of the leaked pressure medium gas is high, the seal ring will rapidly oxidize and burn, and at the same time, the steel high-pressure vessel may catch fire. Conventional) (I
With the P device, such leakage of pressure medium gas cannot be detected early.

The present invention was made as a result of studies to solve the decisions of the prior art as described above, and detects leakage of pressurized gas to prevent serious accidents and ensure safety. It is an object of the present invention to provide a hot isostatic pressing device.

(Means for Solving the Problems) The present invention includes a high-pressure cylinder 9 having an opening 9A at at least one end, and a seal ring 1 which is removably inserted into the opening 9A.
In order to achieve the above-mentioned object in a hot isostatic press apparatus in which a resistance wire heating type heater 2 is built in a high pressure container 1 consisting of a lid lO that airtightly closes the opening 9A via a The following technical measures have been taken:

That is, in the present invention, a space 17 is formed on the atmospheric pressure side of the seal ring 14 to prevent the pressure medium gas leaking from the seal ring 14 from escaping. Near the opening 21 to the atmosphere,
It is characterized by disposing a gas sensor 15 for detecting leakage of the pressure medium gas.

(Embodiments and Operations) Hereinafter, embodiments and operations of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows one embodiment of the present invention, in which the present invention is applied to a main body pressure vessel portion having a structure similar to that of FIG. 6.

A cover 16 having an opening 21 communicating with the atmosphere is detachably provided on the atmospheric pressure side of the seal ring 14 that airtightly seals the fitting portion (opening 9A) between the upper lid 10 and the high-pressure cylinder 9. When the airtightness of the seal ring 14 is impaired and the pressure medium gas inside the high-pressure container leaks, this leaked gas does not dissipate and the space 1 formed by the cover 16 is closed.
7 and escapes into the atmosphere through an opening 21.

Gas leakage occurs inside this space 17 or at the opening 21.
It is detected by a gas sensor 15 installed near the.

Various types of gas sensors 15 can be used, including one that uses a zirconia oxygen sensor to detect leakage based on changes in the amount of oxygen at the sensor installation area. Further, since the pressure medium gas is usually a dry gas containing almost no moisture, it is also possible to detect gas leakage from changes in the moisture content using a dew point meter as a sensor. Of course, it is also possible to use a sensor capable of detecting argon or nitrogen, which are most commonly used as pressurized gases. However, at present, sensors that can instantly analyze the amount of argon or nitrogen online are not common and are difficult to obtain, so the above two methods are the most practical.

In FIG. 1, the lower IEII portion is the seal ring 14 at the fitting portion (opening 9B) between the high-pressure cylinder 9 and the lower lid 1).
In addition to A, an example of a seal of a conductive member for supplying power to the heater 2, which is normally provided, is also shown.

That is, an electric lead wire 20 is connected to the heater 2, and a circuit is formed in which the lead wire 20 exits from the inside of the high-pressure vessel 1 to the atmospheric pressure side via the heater bus bar 18. The bus bar 18 is connected to the lower lid 1) via an electrically insulating sealing material 19.
is combined with If it is necessary to detect leakage of pressurized gas from this electrically insulating sealing material 19,
As shown in FIG. 1, it is recommended to provide a cover 16A having a space 17A such that gas leakage from the seal ring 14A portion and leakage from the electrically insulating seal member 19 can be detected by one gas sensor 15A. Of course, another gas sensor may be provided to separately detect leakage from the electrically insulating seal member 19.

In addition, in Figure 1, there is only one opening 21.2LA of the cover 16.16A to the atmosphere, but it is necessary to prevent the pressure inside the cover from increasing and blowing the cover away when a large amount of gas leaks. , the openings 21 and 2LA may be provided in large numbers, or may be formed in an annular shape as long as they function as intended by the present invention.

It is preferable that the cover 16 has a structure that allows it to be easily removed when the pressure becomes high, so that high pressure gas does not accumulate within the cover.In this case, under normal conditions,
In order to prevent gas from leaking from the space 17, the spaces between the cover 16, the lid and the high-pressure cylinder may be sealed with a ring 24 as shown in FIG.

FIG. 2 shows another embodiment of the invention. Above 1) In addition to the seal ring 14 similar to the conventional one, another seal ring 14B is provided on the atmospheric pressure side of the seal ring 14 at the fitting part between the 0 and the high pressure cylinder 9 to prevent leakage from the seal ring 4. The released gas first fills the space 17 between the two seal rings 14.14B. this space 1
7 flows out into the atmosphere through the pipe 22. This opening 21
A gas sensor 15 is provided near the. In addition, the space 17 can also be formed as shown in FIGS. 4 and 5.

That is, in FIG. 4, a double radially inner and outer seal ring 14.14B is provided on the flange surface of the upper lid 10 which overlaps the shaft end surface 9C of the high-pressure cylinder 90.
A space 17 is formed between 14B and communicated with the atmosphere through a pipe 22.

Further, in FIG. 5, a seal ring 14.14B is provided on the outer peripheral surface of the fitting portion and the flange surface of the upper M10, and this ring 14.
14B, a space 17 communicating with the atmosphere via a pipe 22
was formed.

In addition, in each of the embodiments shown in FIGS. 3 to 5, a gas sensor as shown in FIG. 2 is provided, although not shown. Further, in each of the above-mentioned embodiments, the high-pressure cylinder 9 is shown as having both ends in the axial direction open, but the high-pressure cylinder 9 has a bottomed cylinder integrally formed with the lower lid 1), for example, a lower lid M1), which is screwed to the cylinder. It may be something.

As described above, according to the embodiment of the present invention, it is possible to detect leakage of pressurized gas occurring in the lid portion at an extremely early stage.

If a leak is detected, an electrical alarm buzzer is sounded, the heating power is turned off, and the pressure medium gas in the high-pressure container is promptly collected into the gas collection device 6 shown in Fig. 6. In some cases, it may be configured to automatically perform operations such as opening the atmosphere release valve 23 shown in FIG.

(Effects of the Invention) The present invention is as described above, and according to the present invention, it is possible to detect leakage of pressure medium gas at a sealed portion of a high-pressure container of a HIP device at an early stage. In particular, when mixing argon with a combustion-supporting gas such as oxygen and using it as a pressure gas, or when using a pressure gas that contains toxic gas components, a leak of the pressure gas can cause a major accident. In such cases, the present invention is very useful from a safety standpoint.

[Brief explanation of the drawing]

Fig. 1 is an elevational sectional view showing a first embodiment of the present invention, Fig. 2 is an elevational sectional view of main parts showing a second embodiment of the invention, and Fig. 3 similarly shows a third embodiment. Fig. 4 is an elevational sectional view of the main part, also showing the fourth embodiment, Fig. 5 is an elevational sectional view of the main part, showing the fifth embodiment. FIG. 7 is a block diagram showing the entire structure of a HIP device to which the present invention can be applied, and is an elevational sectional view of a conventional example. 1...High pressure container, 2...Heater, 9...High pressure cylinder, 9A...Opening, 10...Upper lid, 1)...Lower lid, 14.14^...Seal ring , 15... Gas sensor, 16... Cover, 17... Space, 21...
Opening to the atmosphere, 22... conduit.

Claims (3)

[Claims] (1) A high-pressure cylinder (9) having an opening (9A) at least at one end, which can be inserted into and removed from the opening (9A) and airtightly closes the opening (9A) via a seal ring (14). In a hot isostatic press device in which a resistance wire heating type heater (2) is built in a high pressure container (1) consisting of a lid (10), the seal ring (14) is placed on the atmospheric pressure side of the seal ring (14). A space (17) is formed to prevent the pressurized gas leaking from the space (14) from dissipating, and a space (17) is formed in the space (17) or near the opening (21) of this space (17) to the atmosphere. , a gas sensor (15) that detects leakage of the pressure medium gas;
A hot isostatic press device characterized by having: (2) Space to prevent leaked pressure gas from dissipating (17)
However, the lid (10) and the high pressure cylinder into which the lid (10) is inserted (
9. The hot isostatic press apparatus according to claim 1, further comprising a cover (16) that covers the shaft end surface (9C) of the shaft (9) from the outside. (3) Space to prevent leaked pressure gas from dissipating (17)
is provided with double seal rings (14) (14B) on the lid (10), and the space (17) is between the double seal rings (14) (14B), and the space (17) is Pipes communicating with the atmosphere (22
) is provided through the lid (10).