JPS641626Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to attach only the inner lid of the double lids on the inside and outside of a container used when storing and transporting multiple spent nuclear fuel assemblies to a reprocessing plant, for example. Pressure fluid extraction connection fittings are used to remove the injected air from the container after performing a leak test by injecting air into the container. so that it can be easily attached to and detached from the male connecting fitting for pressurized fluid extraction provided in the pressurized fluid extraction male connecting fitting provided in At the time of connection, the valve body is opened against the closing force by contact with the valve body of the male connecting metal fitting, and radially outward with respect to the same groove formed on the outer surface of the male connecting metal fitting. a cylindrical body having a plurality of ball groups that can be fitted into and engaged with each other;
By sliding the ball group in the axial direction along the outer surface of the cylindrical body, a locked state in which the balls are pushed inward in the radial direction and an unlocked state in which they are allowed to be pulled out and moved in the outward radial direction are achieved. The present invention relates to an improvement of a female connecting fitting having an extrusable operating barrel and a spring for biasing the operating barrel to move into the locked state.

When connecting such a female connection fitting to a male connection fitting, conventionally, the cylindrical body of the female connection fitting is grasped with one hand, and the operating cylinder body is attached with a spring with the other hand. The device was operated to the unlocked state against the force, and in this state was pushed into the male connecting fittings to connect, but in this case, the valve bodies of both the connecting fittings were pushed in the closing direction by only arm strength. In addition to the biasing force of the male fitting, it must be pushed in against the back pressure of the pressure fluid acting on the valve body, making the connection time-consuming and labor-intensive. The drawback was that a large amount of pressure fluid leaked due to the long half-open time. In particular, in the case of containers for transporting spent nuclear fuel as mentioned above, even though the containers are decontaminated and reused, some contamination remains, so the air injected for leak tests is also contaminated, and this contamination There was a serious personal injury problem when air was blown onto the workers during the above-mentioned connection.

The object of the present invention is to make it possible to reliably and easily connect the female connecting fitting to the male connecting fitting without leakage of pressure fluid. A push-in operation handle is connected to the other end of the fluid pipe connected to the body, and a lever connected to the operation cylinder is attached near the handle.

That is, to connect the female connecting fitting to the male connecting fitting, the operating cylinder is moved to the unlocked state by operating the lever while grasping the handle, and the operating cylinder is moved to the unlocked state against the biasing force of the spring. By putting your weight on the handle, you can instantaneously apply a slight force against the closing force of the valve discs of both fittings and the back pressure of the pressure fluid acting on the valve disc of the male fitting. Can be connected by pushing. Therefore, the time when the valve body is half-open is extremely short, and the connection work when extracting pressure fluid can be performed reliably, easily, and safely with almost no leakage of pressure fluid or any accompanying adverse effects on personnel. I ended up getting it.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figures 1 to 6 show the interior of spent nuclear fuel transport container A after a leak test was conducted by injecting air with inner lid 1 of the inner and outer double lids 1 and 2 attached. A female connecting fitting B used for extracting the injected air and an operating device C for connecting it are shown. First, to configure the former female connecting fitting B, it is inserted into a cylindrical body 3 that can be externally connected from the axial direction to the male connecting fitting D for pressure fluid extraction attached to the inner lid 1. A valve body 5 that can come into contact with the tapered surface of an annular protrusion 4 formed on the inner peripheral surface of the cylindrical body 3 and a spring 6 that biases the valve body 5 in the closing direction are provided. The valve body 5 is configured to open against the urging force of the spring 6 by the contact of the shaped connecting fitting D with the valve body 7.

The valve body 7 of the male connecting fitting D is also a female connecting fitting B.
The valve body 5 is configured to be opened against the closing force by contact with the valve body 5.

A plurality of through holes 8 formed at equal intervals in the circumferential direction on the connection port side of the cylindrical body 3 are provided with a radius relative to the circumferential groove 9 formed on the outer circumferential surface of the male connecting fitting D. A lock for pushing and moving the 10 groups of balls radially inward by providing 10 groups of balls that can be fitted and engaged from the outside and sliding them in the axial direction along the outer surface of the cylindrical body 3. An operating barrel 11 is provided which can exhibit both a state and an unlocked state that allows extraction movement outward in the radial direction, and a spring 12 that urges the operating barrel 11 to move to the locked state.

Sealing materials 13 and 14 such as O-rings are installed in the circumferential groove formed between the balls 10 and the annular protrusion 4 on the inner circumferential surface of the cylindrical body 3 and in the circumferential groove formed in the tapered surface of the valve body 5, respectively. At the same time, a ring spring 15 for preventing the operating cylinder 11 from coming off is fitted and held on the outer peripheral surface of the cylindrical body 3 on the connection port side.

The above-mentioned operating device C for connecting female fittings is constructed as follows.

That is, a fluid pipe 16 is threadedly connected to the outlet side of the cylindrical body 3, and a push operation handle 17 is connected to the other end of the fluid pipe 16. This handle 1
7 is a handle body 17A having a substantially U-shaped flow path 18 communicating with the fluid pipe 16;
It consists of hollow grip parts 17B, 17B which are screwed and fixed to the left and right sides of this handle body 17A,
Further, hexagonal heads 17C, 17C for screwing the grip parts 17B, 17B into the handle body 17A with a spanner or the like are fixed to the ends of the grip parts 17B, 17B.

Inlet side connection part 17a of the handle main body 17A
A cylindrical member 19 that is slidable in the axial direction of the fluid pipe 16 is fitted and held between the lower end of the fluid pipe 16 and the lower end of the cylindrical member 19. A holder 20 connected to the operating cylinder 11 is screwed and fixed via a lock nut 21 so that the mounting position can be adjusted freely, and the one grip part 17B is attached to the upper end of the cylindrical member 19. A lever 22 that can be operated with a grasped hand is provided, and this lever 22 has the handle body 17.
A pair of guide pins 23 and 24 are fixed to the grip portion 17B and one of the grip portions 17B in a slidable manner.

When connecting the female connecting fitting B to the male connecting fitting D, both grip portions 17B of the handle 17,
17B and operate the lever 22 with one hand to move the operation cylinder 11 to the unlocked state against the biasing force of the spring 12. In this state, the handle 17 is inserted into the male connecting fitting D, and when the finger is released from the lever 22, the handle 17
By pushing in, the closing urging force of the valve bodies 5, 7 of both connecting fittings B and D and the valve body 7 of the male connecting fitting D are reduced.
can be coupled instantaneously against the back pressure of the pressure fluid acting on the

Further, a safety ball valve 26 is connected to the outlet side connection portion 17b of the handle body 17A via a nipple 25, and furthermore, this ball valve 26
A male connecting fitting 28 for pressure fluid extraction is connected to the pump via a nipple 27.

A hose 33 is connected to the male connecting fitting 28 for guiding the pressure fluid to a predetermined location when the pressure fluid is extracted.

The spent nuclear fuel transport container A has a bottle 31 capable of compartmentally storing a plurality of spent nuclear fuel assemblies inside a cask 30, which has a large number of cooling fins 29 fixed to its outer circumferential surface. container 3
A lead partition wall 32 is interposed between the containers 30 and 31, and the upper openings of both containers 30 and 31 are closed with the lids 2 and 1, respectively.

To briefly explain the process of storing spent nuclear fuel assemblies in the container A and transporting them to a reprocessing plant, (a) Container A is carried to the floor where the fuel storage pool is located in the building.

(b) Perform a leak test on this floor by injecting air with only the inner lid 1 of container A attached.

(c) If this leak test is passed, bolt 31
After extracting the injected air (approximately 3 kg/cm) from inside the bottle 31 and lowering the pressure inside the bottle 31 to atmospheric pressure, the inner lid 1 is removed.

(d) Lower the container A into the pool and store the spent nuclear fuel assembly in the bottle 31 below the liquid level.

(e) Place the inner cover 1 on the bolts 31 in the pool, tighten and fix this via the bolts, and then place the outer cover 2 on the cask 30 in alignment with the guide pins temporarily fixed in advance. Thereafter, this container A is lifted from the pool and placed on the floor, the outer lid 2 is tightened and fixed via bolts, and then decontaminated at a predetermined decontamination site.

(f) Transport Container A after decontamination outside the building and transport it to the reprocessing plant.

In the above-mentioned embodiment, the operating device for the female connecting fitting was described for extracting air injected into the spent nuclear fuel transport container A for leak testing, but this operating device can be used for extracting various pressure fluids. It is particularly effective for extracting harmful fluids that are likely to have an adverse effect on the human body, such as radioactively contaminated air.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the container for transporting spent nuclear fuel, Figure 2 is a vertical cross-sectional view of the female connecting fitting and operating device, Figure 3 is a vertical cross-sectional view of the main parts before connection, and Figure 4 is the connection. FIG. 5 is a longitudinal cross-sectional view of the main part of FIG. 2, and FIG. 6 is a cross-sectional view taken along the line - in FIG. 2.
FIG. 3... Cylindrical body, 5, 7... Valve body, 9... Circumferential groove,
10...ball, 11...operation barrel, 12...spring, 16...fluid pipe, 17...handle,
19... Cylindrical member, 20... Holder, 22...
Lever, D...Male connection fitting.

Claims (1)

[Claims for Utility Model Registration] It is possible to externally connect the male connecting fitting D for pressure fluid extraction from the axial direction thereof, and to connect the male connecting fitting D with the valve body 7 at the time of the connection. The valve body 5 is opened against the closing force by the valve body 5.
and a circumferential groove 9 formed on the outer surface of the male connecting fitting D.
A cylindrical body 3 has a plurality of groups of 10 balls that can be fitted from the outside in the radial direction, and the balls 10 are slidable along the outer surface of the cylindrical body 3 in the axial direction. An operating cylinder 11 that can bring about a locked state in which the group is pushed inward in the radial direction and an unlocked state in which it is allowed to move outward in the radial direction, and the operating cylinder 11 in the locked state. The operating device for coupling a female connecting fitting is equipped with a spring 12 that biases movement, and has a handle 17 for push-in operation connected to the other end of a fluid pipe 16 that is communicatively connected to the cylindrical body 3. An operating device for connecting a female connecting fitting, characterized in that a lever 22 linked to the operating cylinder 11 is attached near the handle 17. To link the operation cylinder 11 and the lever 22, a cylindrical member 1 is fitted and held on the fluid pipe 16 so as to be slidable in the axial direction of the fluid pipe 16.
A holder 20 connected to the operating cylinder 11 is screwed and fixed to one end of the cylindrical member 19 so as to be adjustable in position, and the lever 22 is fixed to the other end of the cylindrical member 19. An operating device for coupling a female connecting fitting as claimed in claim 1.