JPS634865Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overflow prevention valve, particularly an overflow prevention valve having a cylindrical body made of synthetic resin.

Conventionally, an overflow prevention valve has been used in which a synthetic resin ball valve 2 is accommodated in a free state in a metal cylindrical body 1. In this case, since the cylindrical body 1 is made of metal, static electricity is prevented. Even if the ball valve is charged, it will be discharged from the main body to the grounded Kotuku main body.

This static electricity includes static electricity that is generated due to friction between the ball valve 2 and the gas flow, and static electricity that is generated when the ball valve 2 moves within the cylindrical main body 1. However, since the cylindrical main body 1 is made of synthetic resin, In the case of the overflow prevention valve configured as above, the static electricity charged in the ball valve 2 and the cylindrical main body 1 is maintained in a charged state, and an attractive force due to the static electricity acts between the ball valve 2 and the cylindrical main body 1. Therefore, when the ball valve 2 is fitted into the valve seat port 3, the amount of gas passing through the valve seat port 3, that is, the operating flow rate increases.

That is, the operating flow rate of the overflow prevention valve changes depending on the degree of static electricity.

The object of the present invention is to enable static electricity generated in an overflow prevention valve having a cylindrical main body made of synthetic resin to be discharged to the ground side.

The technical means of the present invention for solving the above problems is to construct the head of the cylindrical main body forming the valve seat opening from a good conductor such as a metal material, and to connect the head to a metal part such as the cock body. On the other hand, a ball valve accommodating cylindrical portion connected below the head is made of synthetic resin, and a delay activation obstacle member made of a good conductor is housed and held in the ball valve accommodating cylindrical portion, and The member is of a type for accommodating a ball valve and for colliding with a part of the ball valve during upward movement to reduce the moving speed of the ball valve, and the upper end of the obstacle member is attached to the metal head. This is because they came into contact with each other.

According to the above technical means of the present invention, since the ball valve is housed in the obstruction member made of a good conductor, a part of the ball valve is disposed in the obstruction member in both the unused state and the used state. The ball valve is in contact with the lower end of the ball valve or its vicinity, and the static electricity charged in the ball valve is discharged from the obstacle member to the ground portion via the head and the main body portion of the ball valve. In other words, the ball valve is prevented from being charged with static electricity. This also applies to the ball valve housing cylinder made of synthetic resin.

Therefore, changes in the operating flow rate due to static electricity can also be prevented.

The present invention has the following unique effects.

Since the delayed activation obstruction member that incorporates the overflow prevention valve acts as a conductor to discharge static electricity, it is necessary to use a special anti-static treatment, such as when applying special anti-static treatment to a ball valve. No need for means.

Furthermore, since static electricity is constantly discharged, there is no concern that the antistatic effect will deteriorate over a long period of use.

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

The overflow prevention valve of this embodiment is as shown in Fig. 2.
It is of the type adopted in a wall box, and a receiving piece 51 for supporting the ball valve 2 in a free state is integrally formed at the lower end of the ball valve accommodating cylinder part 5 made of synthetic resin, and on the other hand, at the upper end. is a metal head 4
It is externally fitted into a cylindrical portion 41 formed at the lower end of the cylindrical portion. (Figures 2 and 4) The head 4 is a cylindrical body with a valve seat opening 3 as its upper end opening, and a collar 42 protrudes from the middle of its body.
The lower part of the flange becomes the aforementioned cylindrical part 41, and the packing 8 is fitted onto the cylindrical part and is in close contact with the lower surface of the flange. The fitting portion between the cylindrical portion 41 and the ball valve accommodating cylindrical portion 5 is provided with an engaging means by engaging a rib and a groove, whereby the two are fixed in a tightly fitted state.

Further, a ball valve 2 and a coil spring 6 are disposed within the cylindrical main body 1 formed by the head 4 and the ball valve housing cylinder part 5.
is accommodated, and the coil spring functions as an obstacle member for delayed activation.The coil spring is inserted between the vicinity of the valve seat opening 3 of the head 4 and the receiving bar 51,
A ball valve 2 is housed and held inside.

In addition, this overflow prevention valve is connected to the lower closure 7 and the third
As shown in the figure, a shaft portion 52 that is paired with a cam and protrudes from the receiving frame 51 is paired with a cam portion 71 of the closure 7, and the overflow prevention valve is configured to move up and down in accordance with the rotation of the closure. When the closure 7 is in the fully open position, the overflow prevention valve is lowered, and the gasket 8 provided on the lower surface of the collar 42 comes into contact with the stepped portion 11 formed inside the lock body 10, thereby opening the overflow prevention valve. Airtightness of the outer circumference of the cylindrical main body 1 is ensured. Further, in order to provide a descending force of the overflow prevention valve and an airtight force by the packing 8 in the descending state, the flange portion 4
A compression spring 12 made of a metal wire is interposed between the spring 2 and the channel wall of the main body 10.

In the case of the above embodiment, since the ball valve 2 is spherical, it is almost never in a non-contact state with the coil spring 6 at an intermediate position, and a part of the ball valve frequently comes into contact with the coil spring. Become. On the other hand, the coil spring 6 is made of a metal wire and is electrically connected to the main body 10 via the head 4 and the compression spring 12. Therefore, ball valve 2
The ball valve accommodating cylindrical portion 5 is grounded through the path, so that the static electricity prevention effect described above can be obtained.

Incidentally, as the obstacle member, a support frame as shown in Japanese Utility Model Application Publication No. 57-59267 can also be adopted. It is also possible to adopt a method in which the tube 4 is directly fixed to the channel of the pot body by screwing or the like.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is an explanatory diagram of a box stock using the embodiment of the present invention, and Fig. 3 is a sectional view of the main part showing the relationship between the closure 7 and the overflow prevention valve in this case. , Fig. 4 is an exploded view of the overflow prevention valve according to the embodiment of the present invention, and in the figure, 1... cylindrical main body, 2... ball valve, 3... valve seat port,
4...Head, 5...Ball valve housing cylinder, 6...Coil spring, 10...Kotuku body.

Claims (1)

[Scope of utility model registration request] In an overflow prevention valve in which a synthetic resin ball valve is housed in a free state in a cylindrical main body, the head of the cylindrical main body forming the valve seat opening is made of a good conductor such as a metal material, and the head is made of a good conductor such as a metal material. A ball valve accommodating cylindrical part connected to the lower part of the head is made of synthetic resin, and a delayed actuation valve made of a good conductor is installed in the ball valve accommodating cylindrical part, which is in electrical contact with the metal part of the Kotuku body. The obstacle member is of a type that accommodates a ball valve and that collides with a part of the ball valve during upward movement to reduce the moving speed of the ball valve. An overflow prevention valve whose upper end is in contact with the metal head.