JP3034802B2 - O-ring fixing jig and O-ring fixing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for fixing an O-ring used for a seal mechanism of a slide damper housed in a glove box for isolating devices or devices handling radioactive materials in a nuclear facility or the like. The present invention relates to a method for fixing an O-ring using the jig.

[0002]

2. Description of the Related Art Conventionally, a large number of devices or devices for handling radioactive materials are arranged in nuclear facilities.
In either case, a shielding device for blocking the movement of radioactive material between itself and the outside world is provided, or a device for controlling the movement of the atmosphere by pressurizing or reducing the pressure in units of the device is employed as necessary. . FIG. 2 shows a longitudinal section of a main part illustrating a slide damper device which can be opened and closed as required by interposing a communication system between such devices.

[0003] The entire slide damper device 1 is surrounded and shielded by a glove box 2, and a communication passage 3 vertically communicated with the slide damper device 1 is arranged in the slide damper device 1.
The communication passage upper portion 31 and the communication passage lower portion 32 communicate with required devices above and below, respectively. A slide damper body 4 is formed at the center of the communication passage 3 so as to be slidable in a horizontal direction by a drive rod 41 driven by an air cylinder (not shown) across the communication passage 3. Then, the slide damper body 4 closes the communication passage 3 at a position that seals the space between the communication passage 3 and the upper surface of the circular opening flange 33 provided in a horizontal cross section, and slides rightward (in FIG. 2). And the communication passage 3 is opened.

The seal between the slide damper main body 4 and the upper surface of the opening flange 33 is sealed by the opening flange 33.
As shown in FIG. 3 whose section is enlarged, the lower surface of the edge 42 of the slide damper body 4 and the upper surface of the opening flange 33 are O
This is done by contact through a ring 34.

The slide damper device constructed as described above is disposed, for example, between a storage container for radioactive waste and an incinerator, so that the communication passage 3 is usually closed and air or other gas is However, if the slide damper is opened to form a series of communication passages, radioactive waste can be transferred to the incinerator while blocking it from the outside if necessary. It is.

In the above-described slide damper device, it is necessary to replace the sealing O-ring with a new one every predetermined period. Internal diameter of communication passage is 450
mm, the entire device is housed in a glove box, and the operating range of the glove is about 500 m in radius.
Because the opening flange 33 to which the O-ring is fixed is included within the operation range of the glove, the above-mentioned O-ring replacement work can be performed unless the glove is provided in such a manner that the opening flange 33 is within the operation range of the glove. In order to eliminate the gap, the gap between the opening flange and the globe has a design limitation, which is one of the problems to be improved.

[0007]

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned problems, and an O-ring capable of reducing the design restriction on the distance between the above-mentioned opening flange housed in the glove box and the glove. Provided are a fixing jig and a method for fixing an O-ring.

[0008]

According to a first aspect of the present invention, there is provided an O-ring fixing jig for solving the above-mentioned problems, wherein a circular opening which can be opened and closed by a slide damper body is provided in a communication passage of a slide damper device accommodated in a glove box. An annular body detachably attached to the edge, wherein a groove for fixing an O-ring is provided on a surface of the slide damper opposed to a sealing surface.

According to a second aspect of the present invention, there is provided a method for fixing an O-ring, wherein the jig for fixing an O-ring is separated from the circular opening edge while rotating the jig. The operation of inserting a new O-ring into the groove for fixing the O-ring and fixing it is performed on one side of the glove box.
Gloves .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an O-ring fixing jig according to the present invention will be described with reference to FIG. 1 and also to FIG. The slide damper device to which the O-ring fixing jig is applied is the same as that of the conventional structure except for a portion where the opening flange 33 of the communication passage 3 is engaged with the slide damper body 4. In the communication passage 3 in the slide damper device 1 housed in the glove box 2, a circular opening flange 33 that can be opened and closed by the slide damper body 4 is disposed.

As shown in FIG. 1, the O-ring fixing jig 35 of this embodiment is an annular metal body which can be detachably fitted to the opening flange 33 so as to cover an inner corner thereof. A groove 36 in which an O-ring 37 is fitted and fixed is formed in the upper surface facing the slide damper body 4 (not shown).
The fixing bolt 39 is disposed from the upper surface of the fixing flange 39 toward the opening flange 33, so that the fitting can be ensured. Further, an O-ring for sealing is airtight between the fixing flange 39 and the side surface of the opening flange 33. It is arranged to maintain the nature.

Next, an embodiment of a method for fixing an O-ring according to the present invention will be described. First, an annular O-ring fixing jig 35 having the above structure, which is fitted to an opening flange 33, is provided.
The fixing bolt 39 is removed, taken out slightly upward from the opening flange 33, and released. And O
While rotating the ring fixing jig 35 clockwise or counterclockwise, the used O-ring 37 is inserted into the O-ring fixing groove 3.
6, and similarly, an O-ring fixing jig 3
While rotating 5, a new O-ring 37 is fitted and fixed in the groove 36 for fixing the O-ring. Next, the O-ring fixing jig 35 to which the O-ring is fixed is fitted to the opening flange 33, and the fixing bolt 39 is tightened so as not to come off. In the present invention, at least such O
It is characterized in that the attachment / detachment operation of the ring fixing jig 35 and the attachment / detachment operation of the O-ring are performed from the glove on one side of the glove box.

As described above, the jig 35 for fixing the O-ring of the present invention is detachably fitted to the opening flange.
Since a concave groove for fixing the O-ring is formed in the upper surface, as in the method for fixing the O-ring according to the present invention, at least the jig for fixing the O-ring from the glove on one side of the glove box can be attached and detached. The O-ring attachment / detachment operation can be performed. Since such an operation only needs to partially overlap the O-ring fixing jig in the operation range of the glove, the O-ring fixing jig is not entirely included in the operation range of the glove as in the related art. There is an advantage that the design constraint that the work cannot be performed is significantly reduced.

[0014]

Since the O-ring fixing jig and the O-ring fixing method of the present invention are configured as described above, the distance between the O-ring fixing jig and the glove is set to 50.
It is possible to make a clearance of about 0 mm, and there is an excellent effect that design restrictions are reduced. Therefore, the present invention has an extremely large practical value as an O-ring fixing jig and an O-ring fixing method in which the conventional problems are improved.

[Brief description of the drawings]

FIG. 1 is an essential part cross-sectional view for explaining an O-ring fixing jig of the present invention.

FIG. 2 is a sectional view of a main part of a conventional slide damper device.

FIG. 3 is a sectional view of a main part showing a fixed state of a conventional O-ring.

[Explanation of symbols]

1 slide damper device, 2 glove box, 3
Communication passage, 33 opening flange, 35 O-ring fixing jig, 36 concave groove, 37 O-ring, 4 slide damper body.

Continuing from the front page (72) Inventor Kazuaki Ito 41-1 Muramatsu Muramatsu, Tokai-mura, Naka-gun, Ibaraki Prefecture (72) Inventor Hideki Yamada 2-56 Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Japan Nippon Insulator Stock In-company (58) Field surveyed (Int.Cl. ⁷ , DB name) G21F 7/047 G21F 7/04

Claims (2)

(57) [Claims] An annular body detachably attached to a circular opening edge that can be opened and closed by a slide damper body in a communication passage of a slide damper device housed in a glove box, and faces a seal surface of the slide damper. An annular O-ring fixing jig, wherein a concave groove is provided on the surface for fixing the O-ring. 2. A new O-ring is fitted into a concave groove for fixing the O-ring while rotating the jig for fixing the annular O-ring according to claim 1 from the circular opening edge. The glove box on one side of the glove box.
A method for fixing an O-ring, wherein the method is performed from a groove .