JPS60557Y2 - Valve fixing device for cylinder type containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a valve fixing device for a cylindrical container that fixes the valve of a cylindrical gas container filled with, for example, high-pressure gas, flammable gas, or toxic gas.

For example, uranium dioxide (UO2), which is the energy source for pressurized water reactors, is the raw material for solid uranium hexafluoride (UO2).
A cylindrical gas container filled with uranium hexafluoride (F6) is heated to turn the uranium hexafluoride (LIP6) inside into a gas and take it out of the container. After introducing this into a conversion device, this uranium hexafluoride gas (uFa) is Add pure water and hydrolyze it to obtain a uranyl fluoride (UO2F2) solution, which is then reacted with aqueous ammonia to form ammonium deuterate ((NH4)2U20).
It is produced by forming a precipitate (7), filtering it, drying it, roasting it, and reducing it.

The uranium hexafluoride (uFs) is a transparent crystalline solid at room temperature and pressure, and sublimes at 56.5° C., and although it is not a highly reactive substance, it reacts violently with water.

Due to this strong reactivity, care must be taken when handling uranium hexafluoride (UF6) containers, equipment, etc.

In other words, in the event of a leak of uranium hexafluoride (UF6), the chemical toxicity of hydrogen fluoride (HF) produced as a result of reaction with moisture may lead to a fatal accident. Atmosphere control is required to promptly detect countermeasures and damage.

Special containers for uranium hexafluoride (UF6) are used that comply with the standard ANSIN141-1971 established by the American National Standards Institute, and one example of this is the 30B type UF cylinder type shown in Figure 1. There is a container.

This container is currently the most widely used, and has a cylindrical steel body 1 with hemispherical upper end plates 2 at both upper and lower ends.
The lower mirror plates 3 are each welded.

A joint 4 communicating with the inside of the cylinder-shaped container is welded near the outer periphery of the upper head plate 2, and a valve 5 is screwed and attached to this joint 4.

As shown in FIG. 2, the valve 5 has an engaging portion (prismatic portion) 6 approximately in the center, a valve body 8 having a passage 7 formed therein, and a valve body 8 screwed into the valve body 8. It consists of a rod 9, a gland packing 10 fitted to the upper part of the valve rod 9, and nuts 11 and 12 screwed to the valve body 8, so that the passage 7 can be opened and closed by turning the valve rod 9. is being done.

A prismatic portion 9a is formed at the upper end of the valve stem 9 so that the valve stem 9 can be rotated using a box wrench.

A blind plug 13 is attached near the outer periphery of the lower mirror plate 3.

Further, a cylindrical body (skirt) 14 extending upward from the upper end plate 2 is provided on the outer periphery of the upper end plate 2, and a cylindrical body (skirt) 14 extending downward from the lower end plate 3 is provided on the outer periphery of the lower end plate 3.
15 are welded to each other, and these cylindrical bodies 14 and 15 protect the valve 5 and the blind plug 13 from impact.

Note that a flexible tube (not shown) communicating with a conversion device (not shown) is connected to the passage 7 by removing the nut 12, so that the uranium hexafluoride (U
F6) Gas can be introduced to the conversion device.

By the way, as mentioned above, uranium hexafluoride (tJF6) is solid at room temperature and is filled in the cylinder-shaped container. ) and heat it after putting the top lid on.

Therefore, in order to open the valve 5, the temperature inside the evaporator is raised to a specified temperature, the top cover is removed, and the valve stem 9 is turned to open. Prismatic part) 6
If you do not rotate the valve stem 9 by holding it with a spanner or the like,
There is a risk that the threaded portion of the valve body 8 to the joint 4 may loosen or come off, causing gas leakage and causing the worker to inhale highly toxic gas.

In addition, since the temperature around the valve 5 is elevated as described above, the work of rotating the valve stem 9 is easy to burn, is dangerous, and has poor workability.

This idea was made in view of the above circumstances, and a fixing jig is installed between the upper end plate of the cylinder type container, the cylindrical body provided on the outer periphery of this upper end plate, and the valve attached to the upper end plate. By engaging and setting the engaging part of the valve,
A valve fixing jig can be attached to a cylinder-shaped container without any processing on the cylinder-shaped container, and this valve fixing jig can be used to attach valves to various cylinder-shaped containers that are not uniformly installed. It is an object of the present invention to provide a valve fixing jig for a cylindrical container that can securely hold an engaging part of a valve and open and close the valve by turning a valve stem, and can safely open and close the valve.

An embodiment of this invention will be described below with reference to FIG.

Note that the same parts as those in the conventional example are given the same reference numerals and their explanations will be omitted.

Reference numeral 21 in FIG. 3 is a valve fixing jig made of metal, and this valve fixing jig 21 includes a fixing jig main body 22, a jig adjustment tool 23, a jig angle adjustment tool 24, and a jig vertical position adjustment tool. It consists of a tool 25.

The fixing jig main body 22 consists of a substrate 26 and legs 27,
The substrate 26 has a rectangular plate whose one end in the width direction is formed into an arcuate surface 28 having the same radius as the inner peripheral surface of the upper part of the cylindrical body 14.
is a plate in which a notch recess 29 is formed approximately at the center of the other end in the width direction, the arcuate surface 28 is opposed to the inner circumferential surface of the cylindrical body 14, and the notch recess 29 is located at the engagement portion of the valve 5. (prismatic portion) 6, with a gap provided between the prismatic portion 6 and the prismatic portion 6,
It is positioned substantially horizontally on the upper head plate 2 and is disposed between the cylindrical body 14 and the valve 5.

The leg portions 27 are plate-shaped and are located on both sides of the valve 5.
6 is provided at the other end in the width direction, facing downward at right angles to the substrate 26.

The lower end surface of the leg portion 27 is formed into an arcuate surface along the upper surface of the upper mirror plate 2, and is placed on the upper mirror plate 2.

A semicircular fixture 32 in which a ring portion 31 provided at one end of a threaded rod 30 is rotatably fitted is attached to a substantially central portion of the upper surface of the substrate 26 on the arcuate surface 28 side.

A clamping member 33 is connected to the threaded rod 30 by fitting a hole formed at one end thereof into the threaded rod 30 and screwing it with a nut 34 .

The clamping member 33 has a clamping part 35, and is attached to the threaded rod 30 as described above, with the upper end edge of the cylindrical body 14 being clamped by the clamping part 35.

Note that the fixture 32, the threaded rod 30, the clamping member 33, and the nut 34 constitute a jig vertical position adjustment tool 25.

Further, on the upper surface of the substrate 26, located on both sides of the valve 5,
Two plate-shaped jig adjustment tools 23 having elongated holes 36 are disposed, and are screwed and attached to the substrate 26 with bolts 37 inserted through the elongated holes 36 .

The end surface of the jig adjustment tool 23 on the side of the cylindrical body 14 is formed into an arcuate surface 38 along the inner circumferential surface of the cylindrical body 14, and can be freely adjusted forward and backward relative to the inner circumferential surface of the cylindrical body 14.

Further, on the other end side of the substrate 26, a jig angle adjuster 24 made of a substantially semicircular plate is attached to a substantially central portion of the upper surface of the substrate 26.

This jig angle adjuster 24 has a locking portion (notch recess) 39 formed approximately at the center of its side, and an arc-shaped elongated hole 40 along its outer periphery.

The jig angle adjuster 24 is screwed into the base plate 26 so that its rotation can be adjusted freely with respect to the base plate 26 by means of a bolt 41 inserted through the elongated hole 40, with the notch recess 36 fitted into the square column part 6 of the valve 5 without a gap. It is fixed and installed.

Next, the operation of this invention will be explained.

(1) When opening the valve 5, loosen the bolts 37, 41 and the nut 34 in advance.
9 is fitted into the square column part 6 of the valve 5 without any gap, and the upper edge of the cylindrical body 14 is held by the holding part 35 of the jig vertical position adjustment tool 25, and the board 26 is positioned so that it is almost horizontal. let

(2) Next, the arcuate surface 38 of the jig adjustment tool 23 is attached to the cylindrical body 14.
The jig adjustment tool 23 is screwed to the base plate 26 with bolts 37 while the legs 27 push the upper end plate 2 and the arcuate surface 38 of the jig adjustment tool 23 pushes the cylindrical body 14. do.

(3) Next, turn the nut 34 and screw it so that the board 26 is positioned substantially horizontally and fixed.

(4) Next, the jig angle adjuster 24 is screwed to the board 26 with the bolt 41.

The above operations (1) to (4) are performed at room temperature.

(5) Next, in order to send uranium hexafluoride (UF6) gas to the conversion device, the evaporator is covered with a lid and the cylindrical container is heated, the lid is removed, and a box wrench is inserted into the square column part 9a of the valve 5. and open the valve 5 by turning the valve stem 9 with this wrench.

This opens the passage 7 of the valve 5, and the uranium hexafluoride (UF6) in the cylinder-shaped container is sent to the conversion device via the flexible pipe.

When rotating the aforementioned valve stem 9, even if the prismatic portion 6 attempts to rotate, the jig adjustment tool 23 comes into contact with the inner circumferential surface of the cylindrical body 14, and this inner circumferential surface prevents the rotation of the base plate 26, which in turn prevents the adjustment. Since the rotation of the tool angle adjuster 24 is suppressed, the prismatic portion 6 cannot rotate.

When the valve stem 9 rotates, the jig angle adjuster 24 tries to rotate the cylindrical body 1 around the central axis of the valve 5.
Since the rotation is suppressed by the inner circumferential surface of the cylindrical body 14 and does not try to rotate around the central axis of the cylindrical body 14, there is a gap between the inner circumferential surface of the cylindrical body 14 and the jig angle adjustment tool 24. No slipping occurs, and therefore the valve 5 is reliably prevented from rotating, and the threaded portion of the valve 5 into the joint 4 will not loosen or come off due to rotation of the valve 5.

In the embodiment described above, the engaging portion 6 is made of a prismatic portion, but the present invention is not limited to this. Locking part 3
Any other shape may be used as long as it can prevent relative rotation with respect to 9.

In addition, in the embodiment, the jig vertical position adjustment tool 25
are the mounting tool 32, the threaded rod 30, the nut 34, and the clamping member 33.
However, the present invention is not limited to this, and for example, a prismatic body is placed on the lower part of the arcuate surface 28 side of the substrate 26, standing up on the upper mirror plate 2, and one side of the prismatic body is placed as a cylindrical body. A bolt is attached to the top of this prismatic body in such a way that it projects upward and cannot move up and down and rotates. A nut is screwed onto this bottle, and this nut is attached to the base plate 2.
6 may be provided with a cutout, and the jig vertical position adjustment tool 25 may be configured by rotatably and detachably attached to the cutout, and the board 26 may be moved up and down by rotating the bolt.

As explained above, according to this invention, the legs of the fixing jig body are placed on the upper end plate of the cylindrical container, and the jig adjustment tool is adjusted forward and backward with respect to the inner peripheral surface of the cylindrical body. Attach it to the top surface of the fixture body by touching it, and use the jig vertical position adjustment tool to position the top surface of the fixture body almost horizontally.
Since the jig angle adjustment tool that is locked and fitted to the engaging part of the valve is attached to the fixing jig body, the valve fixing jig can be attached to the cylinder-shaped container without any processing on the cylinder-shaped container. Even under high temperatures, this valve fixing jig fixes the engaging part of the valve not only on 30B cylinders with uneven angles, but also on various cylinder-shaped containers. The valve can be opened and closed reliably and safely by turning only the valve stem, and the screwed part of the valve to the upper end plate or the part where the piping is attached to the valve will not come loose or come off. It has the following effects: it can prevent gas leakage, has good workability, and can be widely applied to high-pressure containers for ammonia, chlorine, etc.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an example of a conventional cylinder-type container;
FIG. 2 is a longitudinal sectional view of the valve, and FIG. 3 is a perspective view showing an embodiment of the invention. 2... Upper end plate, 4... Joint, 5... Bent valve, 6... Engaging part (prismatic part), 7...
・Passage, 9...Curved valve stem, 14.15...Cylindrical body (skirt), 22...-Fixing jig body, 23...
...Jig adjustment tool, 24...Jig angle adjustment tool, 2
5...Jig vertical position adjustment tool, 26...
Board, 27... Legs, 28, 38...
Arc surface, 39... Locking part (notch recess).

Claims (1)

[Scope of utility model registration request] A valve having an engaging portion and opening/closing an internal valve passage by rotating a valve stem extends upward from the upper end plate on the outer periphery of the upper end plate, which is attached to a part excluding the center of the upper end plate of the cylinder-shaped container. One end of a substrate is opposed to the inner circumferential surface of a cylindrical body provided at a fixing jig body provided between the body and the valve; and a fixture body located on both sides of the valve in the circumferential direction of the upper end plate, so that it can freely move toward and away from the cylindrical body and can be moved and adjusted to the base plate. a plurality of jig adjustment tools attached to the substrate, and a locking portion, the locking portion being locked to the engaging portion of the valve so as not to float, and attached to the substrate so as to freely adjust the rotation angle. a jig angle adjustment tool connected to the substrate and locked to at least one of the upper mirror plate and the cylindrical body so as to freely adjust the vertical position of one end of the substrate; A valve fixing device for a cylinder-type container, characterized in that the valve fixing device for a cylinder-type container is configured to prevent rotation of the valve relative to the upper end plate and rotate the valve stem.