JPH018953Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a hot isostatic pressing device for charging a material to be processed into a pressure vessel and press-forming it using hot isostatic pressure. This is intended to simplify the valve structure interposed between the valve and the external device connected to the valve.

(Prior art) In a hot isostatic press machine (hereinafter referred to as a HIP machine) that charges a material to be processed such as metal powder and presses it with hot isostatic pressure, a pressure vessel 1 is evacuated and the vacuum Conventionally, there are vacuum piping systems shown in FIGS. 7 and 8 for measuring the temperature.

That is, in FIG. 7, a vacuum pump 7 is connected to a connection port of the upper lid 2 of the upper and lower lids 2 and 3 attached to both the upper and lower ends of the pressure vessel 1 via a high-pressure pipe 4, a high-pressure automatic valve 5, and a vacuum pipe 6. At the same time, the degree of vacuum inside the container 1 is measured by a vacuum pressure gauge 8 attached to the vacuum piping 6.

In FIG. 8, a high-pressure pipe 9, a vacuum pipe 10, a high-pressure automatic valve 11, an automatic vacuum valve 12, and a vacuum pressure gauge 8 are connected to the upper cover 2 on the side opposite to the connection port of the vacuum pump 7.

(Problem to be solved by the invention) However, in the case of FIG. 7, the diameter of the high pressure piping 4 is small and the diameter of the high pressure automatic valve 5 is small, so the pressure is lower than the indicated value of the vacuum pressure gauge 8. There is a problem that the internal pressure inside the container 1 increases.

This problem can be improved by configuring as shown in FIG. In this case, the indicated pressure of the vacuum pressure gauge 8 is guaranteed to be higher than the pressure inside the pressure vessel 1, so for the purpose of the HIP device,
The method shown in FIG. 8 is a reliable method if the purpose is to use the vacuum at a certain pressure or less. However, in this case, it is necessary to provide two high-pressure automatic valves 5 and 11, and to open and close each of them using electric signals, hydraulic pressure, or the like. Therefore, the structure is complicated and the entire valve device becomes large, which poses problems in terms of cost and space.

(Means for Solving the Problems) The present invention is intended to solve such conventional problems, and as a specific means for that purpose, a pressure vessel 20 for hot isostatic pressing is provided with: The container 2
0 In a hot isostatic pressurizing device equipped with lids 21 and 22 so as to move inward when the interior is evacuated and to move outward when pressurizing, a valve box 26 is attached to the lids 21 and 22.
The valve box 26 is provided with a passage 27 that communicates the inside of the container 20 with the external device 31, and the lid 2.
An on-off valve 28 that opens and closes the passage 27 in response to movement of the passages 1 and 22 is provided.

(Function) When the inside of the pressure vessel 20 is pressurized, the upper cover 21 moves to the outside, and the on-off valve 28 built into the valve box 26 closes the passage 27. Furthermore, when the inside of the pressure vessel 20 is evacuated, the upper lid 21 moves inward of the pressure vessel 20 and the on-off valve 28 opens.

(Embodiment) The present invention will be described in detail below with reference to the illustrated embodiment. FIGS. 3 and 4 show an outline of the HIP device,
20 is a cylindrical pressure vessel, which includes an upper lid 21 and a lower lid 22.
A press frame 23 having a rectangular frame shape when viewed from the side.
It is located inside. Of the upper and lower lids 21 and 22, the upper lid 21 is attached by a plurality of bolts 24 arranged on the outer periphery so as to be vertically slidable by a gap A, as shown in FIG. It is biased downward by an interposed disc spring 25.
Therefore, when vacuuming, the upper lid 21 lowers as shown in Figure 3, creating a gap A between it and the press frame 23, and when pressurizing, the upper lid 21 rises as shown in Figure 4, creating a gap A between the upper lid 21 and the press frame 23. Contact, output container 2
A gap A is created between the upper end of 0 and the upper end. In the present invention, the on-off valve is opened and closed by utilizing the vertical movement of the upper cover 21 by this gap A.

That is, a valve box 26 is attached to the outer periphery of the upper lid 21, as shown in FIG.
7, an on-off valve 28, and a safety valve 29 are provided. The passage 27 is communicated with the inside of the pressure vessel 20 via a passage 30 formed in the upper lid 21, and is also communicated with a vacuum pressure gauge 31 as an external device. The on-off valve 28 has a valve stem 33 with a pressure equalizing hole 32 that opens and closes the passage 27, and a plunger 34 that opens and closes the valve stem 33. The valve stem 33 is fitted into the valve box 26 so as to be vertically movable, and is biased downward by a spring 36 interposed between the valve stem 33 and the screw cap 35 so as to be in a closed state. The plunger 34 is fitted into the valve box 26 under the valve stem 33 so as to be able to slide up and down, and is also made to protrude below the valve box 26, so that when the upper cover 21 is lowered, that is, when a vacuum is drawn, pressure is applied. The valve stem 33 is brought into contact with the upper surface of the container 20 to press the valve rod 33 upward to open it. Safety valve 29 is passage 2
It is for opening and closing a gas leak hole 37 communicating from 7 to the outside, and includes a valve stem 38, a spring 39, and a plunger 40. The valve stem 38 and the plunger 40 are fitted into the valve body 26 so as to be able to slide vertically,
Further, the plunger 40 is made to project downward from the valve box 26, and is adapted to come into contact with the upper surface of the pressurized container 20 and compress the spring 39 when the upper cover 21 is lowered.

A passage 41 communicating with the inside of the pressure vessel 20 is formed in the upper lid 21 at a position away from the mounting position of the valve box 26, and a vacuum pipe 42 is connected from this passage 41.
A vacuum pump 43 is connected via. The passage 41 can be opened and closed by a high-pressure valve 44, as shown in FIG. 6, and the high-pressure valve 44 is incorporated into the upper lid 21. The high pressure valve 44 is composed of a valve rod 46 with a pressure equalizing hole 45, a piston rod 47, springs 48, 49, a pneumatic cylinder lid 50, a screw lid 51, and the like. The valve stem 46 directly opens and closes the passage 41,
It is urged upward by a spring 49 to bring it into the closed state. The piston rod 47 descends to push open the valve rod 46 downward when air pressure is supplied from the air pressure inlet 52 of the cylinder lid 50, and is normally urged upward by a spring 48. There is. Note that 53 to 60 in the figure are sealing materials.

Next, the operation of the above configuration will be explained. At the time of evacuation, the vacuum pump 43 is operated to exhaust the air inside the pressure vessel 20 from the passage 41 of the upper lid 21 through the vacuum piping 42. At this time, the high pressure valve 44 is in an open state. That is, a predetermined air pressure is supplied from the air pressure inlet 52, the piston rod 47 is lowered against the spring 48, and the piston rod 47 pushes down the valve rod 46 to open the passage 41. Therefore, pressure vessel 2
0 can be exhausted to the outside from the passage 41.

On the other hand, when vacuuming, the top lid 2 is
1 is pushed down, the plunger 3 protrudes downward from the valve body 26 as shown in FIG.
4 and 40 come into contact with the upper surface of the pressurized container 20, the on-off valve 28 closes, and the safety valve 29 opens. That is,
The opening/closing valve 28 opens against the force of the spring 36 because the valve stem 33 is pushed open upward by the rise of the plunger 34. On the safety valve 29 side, the spring 39 is compressed by the rise of the plunger 40, so that the valve stem 38 is pushed up by the spring 39 and the gas leak hole 37 is closed. Therefore, the vacuum pressure gauge 31 communicates with the inside of the pressure vessel 20 via the passages 27 and 30, and the degree of vacuum inside the pressure vessel 20 can be measured by the vacuum pressure gauge 31.

When pressurizing the inside of the pressure vessel 20, when the air pressure on the piston rod 47 of the high pressure valve 44 is released, the piston rod 47 is pushed up by the spring 48, so the valve rod 46 is also pushed upward by the spring 49, closing the passage 41. . When the high pressure valve 44 closes, Ar is introduced into the pressure vessel 20 from a pressure port (not shown).
Sending gas etc. to the inside of the pressure vessel 20 to 2000Kg
Increase the pressure to f/cm ² .

When the inside of the pressure vessel 20 is pressurized, the top cover 21 rises against the disk spring 25, so that the plungers 34, 40 of the on-off valve 28 and the safety valve 29 separate from the top surface of the pressure vessel 20, as shown in FIG. Therefore, the on-off valve 28 is closed and the safety valve 29 is opened. That is, on the on-off valve 28 side, since the plunger 34 is lowered, the valve stem 33 is pushed down by the spring 36 and the passage 27 is closed. On the safety valve 29 side, when the plunger 40 is lowered, the spring 39 is decompressed, and the valve stem 38 is lowered to open the gas leak hole 37. Therefore, even if gas leaks from the on-off valve 28, it can escape to the outside through the gas leak hole 37, and the vacuum pressure gauge 31 can be prevented from being destroyed by the gas leak.

In the above embodiment, the high pressure valve 44 is connected to the upper lid 21.
Although a case is shown in which it is incorporated into a valve box, like the on-off valve 28 and the safety valve 29, it may be incorporated into a valve box provided separately from the upper cover 21. Also, the valve box 26 is connected to the upper lid 21.
It may be provided integrally with

The external device is not limited to the vacuum pressure gauge 31, but may also be a vacuum pump connected to the passage 27.

In addition, the valve box 26, on-off valve 28, safety valve 29, etc.
It is possible to provide not only the upper lid 21 but also the lower lid 22 side, for example. However, in this case, the lower cover 22
The condition is that the sides move up and down.

The relationship between the moving direction of the lid 21 or 22 and the opening/closing of the on-off valve 28 is determined by the relationship with the external device connected to the passage 27, and is not limited to the example.

The pressure vessel 20 can be provided not only in the vertical direction but also in the horizontal direction.

(Effects of the invention) According to the invention, a passage and an on-off valve are provided in the valve box provided in the lid, and the movement of the lid that moves in and out of the pressure vessel during evacuation and pressurization is utilized. Since the on-off valve is operated to open and close, the structure is simple, inexpensive, and very advantageous in terms of space. In particular, since the movement of the lid is used to open and close the on-off valve, there is no need for electrical signals or hydraulic pressure, and there is no need for a control device to open and close the on-off valve.

[Brief explanation of the drawing]

1 to 6 illustrate one embodiment of the present invention, in which FIG. 1 is a sectional view showing the main parts of the present invention, FIG. 2 is an explanatory diagram of its operation, and FIGS. 4
The figure is a schematic diagram showing the outline of the hot isostatic pressurizing device, Figure 5 is a cross-sectional view of the upper lid attachment part, Figure 6 is a side view of the high pressure valve part, and Figures 7 and 8 show a conventional example. It is a piping system diagram. 20...Pressure vessel, 21...Upper lid, 22...Lower cover, 23...Press frame, 26...Valve box, 2
7... Passage, 28... Open/close valve, 29... Safety valve,
31...Vacuum pressure gauge, 44...High pressure valve.

Claims (1)

[Scope of utility model registration request] A pressure vessel 20 for hot isostatic pressing is equipped with lids 21 and 22 that move inward when the inside of the vessel 20 is evacuated and move outward when pressurized. In the pressure device, a valve box 26 is provided in the lids 21 and 22, and the valve box 26 has a passage 27 that communicates the inside of the container 20 with an external device 31, and a passage 27 that communicates with the inside of the container 20 and the external device 31, and a passage 27 that communicates with the inside of the container 20 and the external device 31. 27. A hot isostatic pressurizing device characterized by being provided with an on-off valve 28 for opening and closing 27.