JP2564618Y2 - Permanent magnet safety valve for pressure vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a permanent magnet safety valve for a pressure vessel used for a pressure vessel such as a vacuum melting furnace, a pressure tester, and a pressure cooker.

(Summary of Invention) The present invention is a permanent magnet type safety valve used for a pressure vessel such as a vacuum melting furnace, a pressure tester, and a pressure cooker, and has a structure in which a valve body is attracted and held by using a magnetic attraction force of a permanent magnet. By adopting the structure described above, the pressure inside the pressure vessel can be reduced to the atmospheric pressure when an abnormality occurs, and the structure can be easily reused.

(Prior Art) FIGS. 4 and 5 show a first conventional example, which shows a spring-type safety valve for a pressure vessel. In these figures, a valve body 2 is arranged so as to close an opening of a flanged cylinder portion 1 fixed to a pressure vessel wall 10, and the valve body 2 is airtightly sealed to a distal end surface of the flanged cylinder portion 1 by an extension spring 3. It is attached and pressed so as to be pressed against.

If the pressure in the pressure vessel is a normal value, the valve body 2 is in a state where the opening of the flanged cylindrical portion 1 is airtightly closed as shown in FIG. 4, but the pressure in the pressure vessel is abnormal due to some abnormality. When the pressure rises, the pressure inside the container increases as shown in FIG.
Is pushed open, and the fluid (gas, liquid, powder, etc.) inside is released from the opening.

FIGS. 6 and 7 show a second conventional example, which shows a thin-film (breaking plate) safety valve for a pressure vessel. In these figures, a metal thin film 5 is provided for hermetically closing an opening 4 provided in a pressure vessel wall 10. The metal thin film 5 is formed in advance so as to be convex toward the inside of the container. A knife 6 is disposed behind the thin film 5 outside the pressure vessel.

If the pressure inside the pressure vessel is within the normal range, the metal thin film 5 keeps a convex state inside as shown in FIG. On the other hand, when the inside of the pressure vessel becomes abnormally high, the metal thin film 5 cannot maintain the state of being convex inward, and is pressed by the internal pressure to have a convex surface facing outward, and as shown in FIG. It is in a state of being pierced. As a result, the fluid inside the container is released from the hole 7 formed by breaking the thin film 5, and the inside of the container falls to the atmospheric pressure.

(Problems to be Solved by the Invention) In the spring safety valve of the first conventional example shown in FIGS. 4 and 5, when the pressure in the pressure vessel decreases slightly, the valve body 2 is automatically closed by the action of the spring 3. Therefore, the inside of the container cannot be reduced to the atmospheric pressure, which is dangerous.

On the other hand, the thin film type safety valve according to the second conventional example shown in FIGS. 6 and 7 can lower the inside of the container to atmospheric pressure.
Once opened, it cannot be reused, and there is an inconvenience that it takes time to replace the thin film 5 and the like.

The present invention has been made in view of the above circumstances, and aims to provide a permanent magnet type safety valve for a pressure vessel having a structure capable of lowering the inside of the vessel to the atmospheric pressure once opened and having a reusable structure. And

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a flanged tubular portion provided on a pressure vessel wall and communicating with the inside of the pressure vessel wall, and a distal end surface of the flanged tubular portion. A permanent magnet fixed to the permanent magnet, a magnetic valve element that is attracted by a magnetic pole on the tip end side of the permanent magnet and hermetically closes the opening of the flanged cylinder, and the valve that is engageable with the flanged cylinder. A perforated cover member fixed to the body, and a spring that biases the valve body in a direction away from the distal end surface of the flanged tubular portion, wherein at least a part of the cover member is separated from the valve body. The magnetic portion is attracted to the rear magnetic pole opposite to the front magnetic pole of the permanent magnet.

(Operation) In the permanent magnet type safety valve for a pressure vessel of the present invention, when the pressure inside the pressure vessel becomes abnormally high, the magnetic valve element which has been attracted by the permanent magnet so as to close the opening is removed from the permanent magnet. The opening can be opened apart to lower the interior of the container to atmospheric pressure. The open state of the valve body is maintained by the action of the spring for urging the valve body in the separating direction and the magnetic body portion of the cover member being attracted to the magnetic pole on the back side of the permanent magnet. Further, at the time of re-use, the magnetic valve element which is separated from the permanent magnet may be pressed against the permanent magnet against the force of the spring and returned to the state of being attracted and held by the permanent magnet again.

(Example) Hereinafter, an example of a permanent magnet type safety valve for a pressure vessel according to the present invention will be described with reference to the drawings.

1 to 3, a flanged cylindrical portion 11 made of a non-magnetic material such as stainless steel or aluminum is fixed to a pressure vessel wall 10 with bolts 12, and a hole 13 of the vessel wall 10 and a through hole of the cylindrical portion 11 are provided.
14 is in communication. Also, the mounting side flange of the cylindrical part 11
An O-ring 15 is provided between the mounting surface of 16A and the container wall 10 and hermetically sealed. A large number of columnar permanent magnets 17 are embedded in the distal end flange 16B of the flanged cylindrical portion 11 from the distal end side. In this case, the flanged cylindrical part 11
One of the magnetic poles of each of the permanent magnets 17, that is, the magnetic pole on the distal end side is exposed at the distal end surface of the magnetic head, and an O-ring 18 is disposed in the annular groove 19 on the distal end surface.

On the other hand, a disc-shaped magnetic body valve body 20 is arranged so as to be attractable by the columnar permanent magnet 17, and the valve body 20 surrounds the flanged cylindrical portion 11 and is engageable with the cylindrical body. The cover member 21 is fixed with screws 22. The cylindrical cover member 21 may be entirely made of a magnetic material, but it is desirable that at least the annular portion 23 facing the surface behind the flange 16B be made of a magnetic material. Further, a plurality of holes 24 are formed in the side wall of the cylindrical cover member 21. Further, an annular groove 25 formed in the mounting side flange 16A of the cylindrical portion 11
A compression coil spring 26 is arranged between the cylindrical cover member 21 and the annular portion 23 of the cylindrical cover member 21. This compression coil spring 26 is a valve
It is urged in a direction to separate 20 from the permanent magnet 17.

In the configuration of this embodiment, if the pressure in the pressure vessel is within a normal range (less than the set pressure value), the valve body 20 is turned into a cylindrical permanent magnet against the elastic force of the compression coil spring 26 as shown in FIG.
The opening of the cylindrical portion 11 is hermetically closed by an O-ring 18 which is attracted by the magnetic poles of 17 and is interposed between the distal end surface of the flanged cylindrical portion 11 and the valve body 20.

If the pressure in the pressure vessel becomes abnormally high for some reason and exceeds the set pressure value, the valve body 20 is pushed at a high pressure and separates from the permanent magnet 17 as shown in FIG. , Liquid, etc.) are formed in the opening of the cylindrical portion 11 and the hole 24 of the cylindrical cover member 21.
Is released to the outside through The set pressure value is
Can be set to any value by changing the size, material, and number of arrangements.

Once the valve element 20 separates from the permanent magnet 17, the attraction becomes extremely weak, while the elastic force of the compression coil spring 26 and the annular portion 23 of the magnetic substance are attracted to the magnetic poles on the back side of the permanent magnet 17. As a result, the open state of FIG. 3 is maintained even after the abnormal pressure in the pressure vessel has disappeared. As a result, the inside of the pressure vessel is reliably reduced to the atmospheric pressure.

When the pressure vessel is reused, the valve body 20 may be pressed against the end surface of the cylindrical portion 11 again by an external force so as to be attracted to the columnar permanent magnet 17. Thus, the valve body 20 is again attracted and held by the permanent magnet 17, and the opening is airtightly closed.

(Effects of the Invention) As described above, according to the permanent magnet type safety valve for a pressure vessel of the present invention, by adopting a structure for holding the valve body by using the magnetic attraction force of the permanent magnet, the inside of the pressure vessel is improved. When the abnormal high pressure is generated, the valve body is reliably opened, and the open state of the valve body is determined by the action of a spring for urging the valve body in the separating direction and the magnetic body portion of the cover member being attracted to the magnetic pole on the back side of the permanent magnet. Can be surely continued. In addition, there is an advantage that it can be easily reused as it is after the processing of the occurrence of the abnormality.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a permanent magnet type safety valve for a pressure vessel according to the present invention, in which a valve body is closed, FIG. 2 is a plan view thereof, and FIG. 3 is a state in which the valve body is open. Sectional view of the same, 4th
FIG. 1 is a front sectional view of a first conventional example with a valve body closed,
FIG. 5 is a front sectional view showing a state where the valve body is opened, and FIG.
FIG. 7 is a front sectional view showing a conventional example in a state where a thin film is closed, and FIG. 7 is a front sectional view showing a state where a thin film is broken and opened. 10 ... pressure vessel wall, 11 ... cylindrical part, 15, 18 ... O-ring, 17 ... permanent magnet, 20 ... valve body, 21 ... cylindrical cover member, 24 ... hole, 26 ... compression Coil spring.

Claims (1)

(57) [Scope of request for utility model registration] 1. A flanged tubular portion provided on a pressure vessel wall and communicating with the inside of the pressure vessel wall, a permanent magnet fixed to a distal end surface of the flanged tubular portion, and a distal magnetic pole of the permanent magnet. A magnetic valve body that is sucked and hermetically closes the opening of the flanged tubular portion, a perforated cover member that is engaged with the flanged tubular portion and is fixed to the valve body, A spring biasing in a direction away from the distal end surface of the flanged cylindrical portion, at least a part of the cover member is a rear magnetic pole opposite to a distal magnetic pole of the permanent magnet when the valve body is separated. A permanent magnet type safety valve for a pressure vessel, wherein the valve is a magnetic body part to be attracted.