JP2647722B2 - Warm hydrostatic pressurization method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to pressure treatment of foods such as sterilization, pressure deformation processing, control of oxygen reaction, pressure molding of ceramic powders and metal powders, and production of ceramic sheets. For warm isostatic pressing (hereinafter referred to as WIP) equipment used for pressure lamination bonding, etc.
More specifically, the present invention relates to a WIP device that heats a liquid that causes a dielectric heating action by using an electromagnetic wave (hereinafter, referred to as a microwave) having a frequency of 100 KHz or more, and performs a WIP process using the heated liquid as a pressure medium.

(Prior art) A WIP device is a device for subjecting an object to be processed to hydrostatic pressure treatment using a liquid heated to a warm region (50 ° C. to 400 ° C.) as a pressure medium, and heating the pressure medium of the WIP device. As a method,
There are an external circulation heating type in which a heating device is provided in the circulation path of the pressure medium, and an external heating type in which a heating device is provided on the outer periphery of the pressure vessel.

As an external circulation heating type WIP device, for example, JP-A-61-1
There is one disclosed in Japanese Patent No. 24503. FIG. 4 is a sectional view showing the configuration of the external circulation heating type WIP device disclosed in this publication. In the figure, reference numeral 52 denotes a cylindrical high-pressure container, and upper and lower openings of the high-pressure container are provided with a substantially cylindrical upper lid 53 and a lower lid 54 via ring-shaped seal packings 56 and 57, respectively. The processing chamber 55 is defined by the high-pressure container 52, the upper lid 53, and the lower lid 54. Further, the lower lid 54 is formed with a pressure medium supply port 60 and a pressure medium discharge port 59 which penetrate the lower lid 54, and the ports 60, 59
Is connected to a pressure medium circulation means 61 having a pressure medium tank 78. The pressure medium circulating means 61 connects the pressure medium tank 78 and the pressure medium supply port 60 with a pipe 65 as circulation means on the pressure medium supply side,
In the pipe 65, a heating circulation pump 69, a heater 68, a three-port two-position switching valve 67, and a first two-port two-position switching valve 66 are provided in this order from the pressure medium tank 78. In addition to the pipe 65, another pipe 70 is connected to the 3-port 2-position switching valve 67, and the pipe 70 is connected to a check valve 71.
Is connected to the pressure medium tank 78 via the. The pressure medium supply port 60 and the first two-port two-position switching valve 66
The other pipeline 62 is connected to the pipeline 65a between the
The line 62 includes a line 65a between the pressure medium supply port 60 and the first two-port two-position switching valve 66 and a pressure medium tank 78.
In addition, a pressurizing pump 64 and a check valve 63 are provided in the pipeline 62 in this order from the pressure medium tank 78. On the other hand, the pressure medium circulating means 61 connects the pressure medium tank 78 and the pressure medium discharge port 59 with a pipe 72 as a circulating means on the pressure medium return side, and
The 72 is provided with a second two-port two-position switching valve 73 and a discharge pump 74 having a check valve as a protection device against high pressure from the pressure medium discharge port 59 in this order. Further, another conduit 75 is connected to a conduit 72a between the pressure medium discharge port 59 and the second two-port two-position switching valve 73. It is connected to a pressure medium tank 78 via a third two-port two-position switching valve 77.

The operation of the external circulation heating type WIP device shown in FIG. 4 will be described. First, the upper lid 53 or the lower lid 54 is opened, and the processing body 58 is disposed in the processing chamber 55. Next, the 3 port 2 position switching valve 67
To the pipe 70 side, the heating circulation pump 69 is operated, the heater 68 is operated, and the pressure medium is heated while circulating in the direction of the dashed arrow A in FIG. 4, and the pressure medium is heated to a predetermined temperature. Let it. After the temperature rise, the three-port two-position switching valve 67 is switched to the pipe line 65, the first two-port two-position switching valve 66 is opened, and the processing chamber 55 and the pressure medium tank 78 are opened.
Are communicated with each other through a conduit 65. At this time, the two 2-port 2-position switching valves 73 and 77 of the pressure medium discharge side pipeline are both closed. In this state, the heating circulation pump 69 is operated to fill the processing chamber 55 with the heated pressure medium. After the pressure medium is filled, the first two-port two-position switching valve 66 is closed, the pressure pump 64 is operated, and the pressure is increased by supplying the pressure medium into the processing chamber 55 through the pipe line 62 to increase the pressure. 58
Is pressurized with hydrostatic pressure. At this time, the heating circulating pump 69 is operated so as not to lower the temperature of the pressure medium, and while the pressure medium is circulated in the direction of the dashed arrow A in FIG. Port 2
The position switching valve 73 is opened, and the pressurized pump 64 circulates the pressure medium through the pipe 62 and the pipe 72. After the completion of the hydrostatic pressure pressurization, the third two-port two-position switching valve 77 is opened, the pressure medium in the processing chamber 55 is discharged to the pressure medium tank 78, and the pressure in the processing chamber 55 is reduced. This pressure reduction speed is adjusted by the throttle 76.
After the pressure reduction is completed, the remaining pressure medium that cannot be naturally discharged is opened by opening the second two-port two-position switching valve 73 and operating the discharge pump 74 to discharge the pressure medium. After the discharge is completed, the upper lid 53 or the lower lid 54 is opened, and the processing chamber 58 is taken out.

On the other hand, as an external heat type WIP device, for example,
There is one proposed as a second embodiment in JP-A-1-126998. Fig. 5 shows the externally heated WIP presented in this publication.
It is sectional drawing which shows the structure of an apparatus. In the same figure, those having the same numbers as FIG. 4 are the same as those in FIG. In FIG. 5, reference numeral 79 denotes a support jacket which is fitted over the high-pressure container 52,
A heater 80 is provided in a gap between the heater 80 and the heater 52. Reference numeral 61 'denotes a pressure medium supply means, which is different from the case of FIG. 4 which is an external circulation heating type WIP apparatus. The pump 64 and the check valve 63 are provided in this order from the pressure medium tank 78.

In the case of FIG. 5 showing an external heat type WIP device, the pressure medium is supplied while being pressurized by the pressurizing pump 64 of the pressure medium circulating means 61 ′, and the pressure medium in the processing chamber 55 is heated by the heater 80. Heating is performed through the container 52, and WIP processing is performed.

Heating a processing object using microwaves is well known as a so-called microwave oven. Further, as an example of industrial use, there is a melting furnace disclosed in JP-A-60-237379.

(Problems to be Solved by the Invention) As described above, the pressurizing method of the WIP apparatus includes the external circulation heating method and the container external heating method, but these methods have the following problems.

That is, in the case of the external circulation heating type, since the pressure medium is heated in a circulation path outside the processing chamber, a large-scale heating circulation device is required, and heat-resistant parts such as valves and pipes used in the heating circulation device are required. , And there is a problem that the device becomes complicated and expensive. In addition, since heating is performed while circulating the pressure medium, in addition to losing heat from the circulation piping system, it is necessary to heat all the pressure medium in the tank, so a large amount of heat is required to heat the pressure medium. Required and the heating efficiency is poor.
Furthermore, in the external circulation heating method, since the pressure medium is heated outside the processing chamber, not only the operation method of the leading pressure rise type is not possible, but also it is difficult to change the processing temperature during the processing such as reheating. There's a problem.

On the other hand, in the case of the external heating type, since the heating is performed via the high-pressure container, the amount of heat for heating the high-pressure container is wasted, which not only has a problem of poor heating efficiency, but also has a temperature difference inside and outside the high-pressure container. When (outer surface> inner surface) occurs, a tensile stress is generated on the inner surface of the cylinder of the high-pressure container, which causes a problem that the strength of the high-pressure container is reduced. In addition, since a high-pressure container having a large heat capacity is heated, there is a problem in that a time difference is large and temperature control cannot be performed accurately.

An object of the present invention is to provide a WIP method and a WIP device that can accurately and efficiently heat a pressure medium with a heating device having a simple configuration in view of the problems of the related art.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems of the prior art, and the feature of the invention described in claim (1) is that a processing body is disposed in a processing chamber. In a warm isostatic pressing method in which the processing body is pressurized using a heating liquid as a pressure medium,
The liquid pressure medium is a substance that generates a dielectric heating effect by microwave irradiation, and the pressure medium is heated by the microwave in the processing chamber.

The invention according to claim (2) is an apparatus for carrying out the method invention according to claim (1), characterized in that a processing body is disposed in a processing chamber and the processing body is heated by a liquid. In a warm isostatic pressurizing device that pressurizes as a pressure medium,
A microwave emitter of one or more microwave irradiation devices is provided on a wall surface of the processing chamber, and a microwave generator of the microwave irradiation device is arranged outside a pressure-resistant member constituting the processing chamber, The microwave generator is connected to the microwave generator by a microwave transmission cable passing through a pressure-resistant member constituting the processing chamber.

(Operation) According to the present invention, the pressure medium is directly heated by irradiating microwaves without heating in an external conduit or through a high-pressure vessel, so that the time for temperature control is reduced. There is little deviation, and the temperature can be controlled accurately. This is because microwaves have the property of being reflected without being absorbed by a metal such as a high-pressure container, and can selectively heat only the pressure medium, so that the accuracy is further improved.

Further, according to the present invention, since only the pressure medium in the processing chamber can be selectively heated by the microwave without heating the external pipeline and the high-pressure vessel, the loss of heat quantity is small, and the pressure medium is efficiently heated with a small heat quantity. Can be heated.

According to the present invention, unlike the external heat type, since the high pressure vessel is not directly heated, the strength of the high pressure vessel does not decrease.

Further, according to the present invention, unlike the agent circulation heating type, a heating device in an external conduit is not required, and not only the device configuration is simplified, but also heating is not performed in the external conduit, so A shape processing method can be adopted.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a cross-sectional view showing the structure of a first embodiment of the present invention, in which 2 is a cylindrical high-pressure vessel,
At the upper and lower openings of the high-pressure vessel 2, a substantially cylindrical upper lid 3 and a lower lid 4 are fitted via ring-shaped seal packings 6 and 7, respectively. Lower lid 4
Defines the processing chamber 5.

A microwave radiator 11 (antenna) is provided on a wall surface of the upper lid 3 on the processing chamber 5 side. The microwave radiator 11 penetrates the upper lid 3 and forms a member of the processing chamber 5. The microwave transmission cable 13 reaching the outside is connected to a microwave generator 14 arranged outside a member constituting the processing chamber 5. Further, a seal packing 12 is provided between the microwave transmission cable 13 and the upper lid 3 to keep the processing chamber 5 liquid-tight. The components described above constitute a microwave irradiation device 15 which is a main part of the present invention.

On the other hand, the lower lid 4 is formed with a pressure medium supply port 9 and a pressure medium discharge port 10 penetrating the lower lid 4, and the two ports 9, 10 are provided with a pressure medium having a pressure medium tank 22. It is connected to the circulation means 1. The pressure medium circulating means 1 connects the pressure medium tank 22 and the pressure medium supply port 9 by a pipe 16 as a pressure medium supply-side circulating means, and a pressure pump
An 18 and a check valve 17 are provided in this order from the pressure medium tank 22. The pressure medium circulating means 1 connects the pressure medium tank 22 and the pressure discharge port 10 with a pipe 19 as a pressure medium return side circulating means, and
A first two-port two-position switching valve 20 and a discharge pump 21 are provided in this order from the pressure medium discharge port 10. Further, the pressure medium discharge port 10 and the first 2
Another line 2 is connected to the line 19a between the port 2 position switching valve 20 and the line 19a.
The line 23 is connected to the pressure medium tank 22 via a throttle 24 and a second two-port two-position switching valve 25. The pressurizing pump 18, the discharge pump 21, and the two two-port two-position switching valves 20 and 25 are connected to a control device 27 by an electric system 26, and the control device 27 controls the supply and discharge of the pressure medium. Control.

The operation of the apparatus according to the first embodiment of FIG. 1 will be described. First, the lower lid 4 or the upper lid 3 is opened, and the processing body 8 is disposed in the processing chamber 5. Next, with the two two-port two-position switching valves 20 and 25 both closed, the pressure pump 18 is operated to fill the processing chamber 5 with the pressure medium. After the pressure medium is filled, the microwave is emitted from the microwave radiator 11 to the pressure medium to heat the pressure medium, and the operation of the pressurizing pump is continued even after the pressure medium is filled to pressurize the processing chamber. After filling the pressure medium, how to perform heating and pressurization, that is, whether to precede temperature increase or precede pressure increase, may select a method suitable for the processing object. After the completion of the isostatic pressurization, the second two-port two-position switching valve 25 is opened, the pressure medium in the processing chamber 5 is discharged to the pressure medium tank 22, and the pressure in the processing chamber 5 is reduced. The pressure reduction speed at this time is adjusted by the throttle 24. After decompression is complete,
The remaining pressure medium that cannot be naturally discharged is opened by opening the first two-port two-position switching valve 20 and operating the discharge pump 21 to discharge the pressure medium. After the discharge is completed, the upper lid 3 or the lower lid 4 is opened, and the processing body 8 is taken out.

As the pressure medium used in the present invention, a liquid having a physicochemical property that generates a dielectric heating action by microwaves or a liquid containing a substance that generates a dielectric heating action is used. Specifically, water may be used at a low temperature.

The frequency of the microwave used in the present invention is not particularly limited as long as it can heat the pressure medium.
MHz or 915 MHz may be used.

In the microwave irradiation apparatus of the present invention, when the pressure medium is heated, if the processing body itself is a substance having physicochemical properties that cause a dielectric heating action by the microwave, the processing body itself is also directly heated. .

FIG. 2 is a sectional view showing the structure of the second embodiment of the present invention, and is effective for a large-sized apparatus having a processing chamber diameter of 500 mm or more.
In the figure, those having the same numbers as those in FIG. 1 are the same as those in FIG. In FIG. 2, 15a to 15d
Is a microwave irradiator, the microwave radiators 12a to 12d of the irradiator are all mounted on the inner peripheral wall of the high-pressure container 2, and the microwave radiators 12a to 12d include:
Microwave transmission cables 13a each penetrating the high pressure vessel 2
One end of each of the microwave transmission cables 13a to 13d is connected to one end of each of the microwave transmission cables 13a to 13d.
To 14d are connected to the microwave generators 14a to 14d.
d is installed on the outer peripheral wall surface of the high-pressure vessel 2. Further, the upper lid 3 is provided with a stirring fan 28 including a shaft portion 30 and a fan portion 29.
Reference numeral 30 is attached through the upper cover 3 through a seal packing 32, is rotatable with respect to the upper cover 3, and is connected to an electric motor 31 mounted on the upper cover 3.

According to the device according to the second embodiment, the temperature in the processing chamber 5 can be made uniform by rotating the stirring fan 28 by the electric motor 31 to stir the pressure medium. Suitable for equipment.

FIG. 3 is a sectional view showing the structure of a third embodiment of the present invention, and is effective for a high-temperature apparatus having a processing temperature of 500 ° C. or more. In the figure, those having the same numbers as those in FIG. 1 are the same as those in FIG. In FIG.
33 is an inner and outer double cup-shaped heat insulating layer,
33a and an outer heat-insulating layer 33b.
It is mounted on the lower lid 4 by 34.

According to the apparatus according to the second embodiment, the high-pressure container 2 can be protected from the high temperature in the processing chamber 5 by the inner and outer double heat-insulating layers, and therefore, it is suitable for a high-temperature apparatus.

In all of the embodiments described above, the pressurization is performed by supplying the pressure medium into the processing chamber, but the direct pressure type apparatus in which the piston is pushed into the processing chamber to directly pressurize the pressure medium is also used. Needless to say, the present invention can be applied.

(Effects of the Invention) According to the present invention, since the pressure medium is directly heated by irradiating the microwaves, the time deviation of the temperature control is small and the temperature can be controlled accurately.

Further, according to the present invention, since only the pressure medium in the processing chamber can be selectively heated by the microwave, the loss of heat quantity is small, and the pressure medium can be efficiently heated with a small heat quantity.

[Brief description of the drawings]

FIG. 1 is a sectional view of an apparatus according to a first embodiment of the present invention, FIG. 2 is a sectional view of an apparatus according to a second embodiment of the present invention, and FIG.
FIG. 4 is a cross-sectional view of an apparatus according to a third embodiment of the present invention, FIG. 4 is a cross-sectional view showing a conventional apparatus of external circulation heating type, and FIG. 5 processing chamber, 8 processing body, 11 microwave emitter, 13 microwave transmission cable, 14 microwave generator, 15 microwave irradiator.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akira Asari 4- 10-20 Motoyamanakacho, Higashinada-ku, Kobe City, Hyogo Prefecture (72) Inventor Shigeko Takugi TW 1E 6NT, Sally, Richmond, Flyers Style Road, Heathshot, Flat 14

Claims (2)

(57) [Claims] In a warm isostatic pressing method in which a processing body is placed in a processing chamber and the processing body is pressurized using a heating liquid as a pressure medium, the liquid pressure medium exerts a dielectric heating action by microwave irradiation. A hot isostatic pressing method, wherein the pressure medium is generated by microwaves in the processing chamber. 2. A processing body (8) is arranged in a processing chamber (5),
In a warm isostatic pressurizing device for pressurizing the processing body (8) using a heating liquid as a pressure medium, a microwave radiator (15) of one or a plurality of microwave irradiation devices (15) is provided on a wall surface of the processing chamber (5). 11) is provided, and a microwave generator (14) of the microwave irradiator (15) is disposed outside a pressure-resistant member constituting the processing chamber (5), and constitutes the processing chamber (5). A microwave transmission cable (13) penetrating a pressure-resistant member that connects the microwave emitter (11) and the microwave generator (14). .