JP2007121068A - Device for sealing inner ring for glove box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for sealing an inner ring for a glove box which minimizes the generation of new waste without the fall of an existing inner ring when an unnecessary glove port is blocked because a storage space in storage facilities is limited in the disposal of radioactive contaminants. <P>SOLUTION: An inside flange 21 is placed on the inside periphery surface of the inner ring 20 and a locking tongue piece 27 with a locking claw 28 formed at its tip is mounted on an annular trunk 24 of a sealing stopper 23 with a bottom plate part 25. A flange part 26 is placed protrusively outside the trunk 24 and the outer diameter of the flange part 26 is made a little smaller than the inner diameter of the inner ring 20. When the sealing stopper 23 is pushed into the inner ring 20 and the locking claw 28 climbs over the inside flange 21, the claw 28 locks into the flange 21 through the restoration of the locking tongue piece 27. After the above process, the sealing stopper 23 never falls off and the inner ring 20 is sealed. A packing 30 is allowed to intervene according to the need. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  This invention closes the inner ring that holds the working glove in the glove box that confines the environment of dangerous substances when handling radioactive substances in nuclear facilities, toxic substances or other dangerous substances in chemical factories, etc. The present invention relates to a glove box inner ring sealing device.

  Hazardous substances that adversely affect the human body, such as radioactive substances and toxic gases, must be handled in a closed space so that workers do not touch these hazardous substance environments. A glove box is a device that closes this kind of dangerous substance and allows it to be handled from the outside. FIG. 7 shows a schematic structure of a glove box 1 used in a nuclear facility that handles radioactive substances. Various handling devices 2 for radioactive substances are arranged inside the glove box 1, and a glove port 3 for the driver P to operate the handling device 2 is provided on the front wall. The front wall is made of a material that allows the inside to be visually confirmed. In addition, the side wall of the glove box 1 is large for supplying necessary tools and devices inside the glove box 1 into the glove box 1 and taking out unnecessary parts and devices in the glove box 1. Port 4 is provided. In addition, ventilation in the glove box 1 is performed by the air supply facility 5 and the exhaust facility 6, and the exhaust is purified and the radioactive material is surely removed. The inside of the glove box 1 is maintained at a negative pressure so that the internal environmental air does not leak to the outside. Also, an alarm panel 7 is provided so that an alarm is issued when an abnormality occurs.

  FIG. 6 is a cross-sectional view showing the structure of the glow port 3. The glove port 3 is a resin cylinder fixed to the front wall of the glove box 1, and an inner ring 11 is inserted into the inner peripheral surface thereof. A double ring groove 11a is provided on the outer surface of the inner ring 11 on the front side from the center to the glove box 1 side, and a cuff mounting portion 11b is formed behind the ring groove 11a. ing. A rubber glove 12 is put on the ring grooves 11a, and the cuff 12a of the glove 12 is brought into contact with the cuff attaching portion 11b. The globe 12 is fixed with an O-ring 13 so as to engage with the ring groove 11a. Further, an appropriate number of packing grooves 11c are formed at the rear of the cuff mounting portion 11b. A packing 14 is accommodated in the packing groove 11c and is in close contact with the inner peripheral surface of the globe port 3, so that the The space between the ring 11 is sealed. A locking groove 11d is formed on the inner side surface of the inner ring 11 at the rear end. On the other hand, a locking groove 10 a is formed at the rear end of the outer surface of the globe port 3. A fixed ring 15 having engaging portions 15a and 15b that are engaged with the engaging groove 11d and the engaging groove 10a is provided. That is, the stationary ring 15 is annular, and a cross section cut by a plane including the annular axis is substantially U-shaped, and one leg portion of the U-shape is elongated, and the distal ends of these leg portions The engaging portions 15a and 15b are formed on the top. Therefore, when the fixed ring 15 is engaged with the globe port 3 and the inner ring 11 by the engaging portions 15a and 15b, the inner ring 11 is connected to the globe port 3 and the inner ring 11 is detached from the globe port 3. It becomes a state that does not.

  Further, in order to replace the inner ring 11, a pushing jig 16 is inserted from the outside of the fixed ring 15. This pushing jig 16 has a cylindrical shape with a bottom 16a, and a flange part 16c is provided on a part of the outer side of the body part 16b. When the pushing jig 16 is attached to the globe port 3, the flange 16c is provided. The portion 16c is in contact with the outer surface of the fixed ring 15. A ring groove 16d is formed on the outer surface of the front end portion of the body portion 16b, and an O-ring 17 is fitted therein. With the pushing jig 16 inserted into the fixed ring 15, the pushing jig 16 is inserted. And the fixed ring 15 so that no slip occurs. To use the glove port 3, as shown in FIG. 7, when the driver P inserts his arm from the glove port 3, the glove 12 is put on the hand and arm and faces the glove port 3. The radioactive material handling device 2 can be operated.

  In the glove port 3 at the position where the radioactive material handling device 2 faces, when not in use, the glove 12 of the glove port 3 is pulled out, for example, left and right so as not to be inadvertently drawn into the glove box 1. The end of each is tied separately, or the two on the left and right are tied. On the other hand, since the glove port 3 in a position where the radioactive substance handling device 2 does not face is never used, an airtight plug is fitted in place of the inner ring 11. For example, Patent Literature 1 discloses a glove port stopper that stabilizes the airtightness between an insert inserted into a glove port and the inner peripheral surface of the glove port. This glove port plug is a glove port plug that is removably inserted into a glove port provided in a glove box and having a cylindrical inner surface, and seals the inside of the glove port, and is formed on the outer peripheral surface of the plug The annular groove is formed of an elastic material and is formed over the entire circumference in the annular direction at a base portion which is in contact with the bottom surface of the annular groove and has a rectangular cross section in the radial direction, and a portion facing the side surface of the annular groove. A gasket having at least one groove is provided.

JP 2004-279135 A

  By the way, the globe 12 is supposed to be replaceable because it may be deteriorated or damaged during work by the driver P. In order to replace the glove 12, the inner ring 11 on which the new glove 12 is mounted is pushed from the outside of the glove box 1 with the pushing jig 16, and the existing glove 12 mounted on the glove port 3 is already installed. The inner ring 11 is dropped into the glove box 1 together. That is, if the fixed ring 15 is removed, the existing inner ring 11 is exposed, and the new inner ring 11 with the new globe 12 attached to the rear end portion of the existing inner ring 11 is brought into contact with and pushed in, The existing inner ring 11 slides against the glove port 3 and falls into the glove box 1. At this time, the fixed ring 15 is attached to a new inner ring 11 and pushed together with the inner ring 11 with the pushing jig 16 and then engaged with the glove port 3 to prevent the inner ring 11 from falling off. The fixed ring 15 is rotated at an appropriate angle with respect to the inner ring 11, whereby the engaging portions 15a and 15b are engaged with and disengaged from the engaging grooves 11d and 10a, and the engaging portions 15a and 15b are engaged with the engaging groove 11d. The stationary ring 15 can be pulled out from the inner ring 11 in a state of being detached from 10a.

  The stopper disclosed in Patent Document 1 is inserted into the inner ring 11 portion. On the other hand, when the operation of the radioactive substance handling device 2 facing the glove port 3 becomes unnecessary, it is desired that the glove 12 cannot be used in the glove port 3 that was originally used. At this time, if the globe 12 remains, the airtightness in the glove box 1 may be impaired due to damage caused by deterioration of the globe 12. For this reason, in order to close the glove port 3 that has become unnecessary, a plug as disclosed in Patent Document 1 is conventionally used. That is, when the glove port 3 is closed with a stopper as disclosed in Patent Document 1, the existing inner ring and the 11 glove 12 are dropped into the glove box 1.

  By the way, there are severe conditions for the disposal of radioactive pollutants, and they cannot be disposed carelessly. Those that can be incinerated will be discarded by incineration, but those that cannot be incinerated may be buried deep underground, for example. Since the inner ring 11 and the globe 12 are not disposed of in a disposal method, they are stored in a storage warehouse, etc., separated from the atmosphere together with radioactive pollutants for which no other treatment method has been established. ing. Since there is a limit to the space of this storage warehouse, etc., it is desirable to reduce the amount of radioactive pollutants waiting to be discarded, but it will be generated in the future because it is difficult to reduce the amount already stored. It is necessary to reduce the amount of radioactive pollutants to be used. In such a situation, when the glove port 3 that has become unnecessary as described above is closed with a sealing plug, the existing glove 12 with the inner ring 11 is dropped into the glove box 1 to generate new radioactive contaminants. It would be irrational to store it.

  Therefore, when the glove port that is no longer needed is closed with a sealing plug, the present invention can securely seal the glove with the existing inner ring in a state where it remains without dropping into the glove box. An object of the present invention is to provide a sealing device for an inner ring for a glove box that does not impair the airtightness of the glove box even if it is damaged.

  As a technical means for achieving the above object, a glove box inner ring sealing device according to the present invention includes a glove attached to the inner ring and various devices housed in a hazardous substance environment. In the glove box to be operated, the glove box has an engagement receiving portion formed on the inner surface of the inner ring and an engagement portion engaged with the engagement receiving portion, and is inserted along the inner peripheral surface of the inner ring. The sealing plug is inserted, and the sealing plug is fixed in the inner ring in a state where the engagement receiving portion and the engaging portion are engaged, and the inner ring is connected to the sealing plug. It is characterized by being blocked by.

  When the sealing plug is inserted into the inner ring, the engagement receiving portion and the engaging portion are engaged with each other, and thereafter the sealing plug is not dropped and the inside of the inner ring can be closed. At this time, the seal between the inner ring and the sealing plug is performed, for example, by pressing the engagement receiving portion and the engagement portion against a surface orthogonal to the axis of the inner ring.

  Further, in the glove box inner ring sealing device according to the invention of claim 2, the engagement receiving portion is an inner flange provided on the inner surface of the inner ring, and the engagement portion has overcome the inner flange. The locking tongue piece is provided with a locking claw that engages with the inner flange later on the tip.

  That is, when the sealing plug is pushed in, the locking tongue is bent, the locking claw gets over the inner flange, and the locking claw gets over the inner flange. It is made to engage with the surface. For this reason, the sealing plug cannot be detached from the inner ring thereafter. And if the surface which the outer-periphery edge part of an airtight stopper and the inner side flange are contact | adhered, between the airtight stopper and an inner side flange will be sealed. In addition, if a sealing stopper and an inner side flange are adhere | attached, a seal will become more reliable.

  A glove box inner ring sealing device according to a third aspect of the present invention is characterized in that a packing is mounted between an outer peripheral portion of the sealing plug and the flange portion.

  In order to ensure the seal between the sealing plug and the inner flange, a packing is interposed.

  Further, in the glove box inner ring sealing device according to the invention of claim 4, the engagement receiving portion is an engagement groove formed in the inner surface of the inner ring in the circumferential direction, and the engagement portion is a disc-like shape. It is an outer peripheral edge portion of the sealing plug, and is characterized in that a packing is interposed in the engaging groove and the engaging groove and the outer peripheral edge portion are engaged with each other.

  When the sealing plug is inserted into the inner ring, the packing provided on the outer peripheral edge of the sealing plug is appropriately compressed. When the sealing plug is further pushed in and the packing reaches the engagement groove, the packing expands, and thereafter the sealing plug cannot be pushed in, and the sealing plug is fixed inside the inner ring. The inner ring is in a sealed state. Further, the gap between the sealing plug and the inner ring is sealed by the engagement between the packing and the engagement groove.

  According to the glove box inner ring sealing device according to the present invention, since the sealing plug can be arranged on the inner ring, when the glove port that is no longer needed is sealed, the inner ring or glove is attached to the glove box. There is no need to drop it in, and an increase in the amount of radioactive contaminants to be disposed of can be suppressed.

  Moreover, according to the glove box inner ring sealing device of the second aspect of the present invention, the inner ring can be sealed by the operation of pushing the sealing plug, so that the work for sealing is simplified. And it can seal reliably by contact | abutting with an inner side flange and a sealing stopper.

  According to the glove box inner ring sealing device according to the third aspect of the present invention, the sealing between the sealing plug and the inner ring can be more reliably performed by the packing.

  Further, according to the glove box inner ring sealing device of the invention of claim 4, the sealing plug can have a simple structure, and can be formed into a disk shape so that the sealing plug can later be radioactive. Even when it becomes a pollutant, its capacity can be minimized.

  1 to 4 show a glove box inner ring sealing device according to a first embodiment of the present invention. An annular inner flange 21 is formed on the inner peripheral surface of the inner ring 20 as an engagement receiving portion. In addition, the other code | symbol shown in FIG. 6 is attached | subjected to the other site | part of the inner ring 20, and the description is abbreviate | omitted. As shown in FIGS. 1 and 2, the tip of the inner flange 21 is formed on an inclined surface 21 a that extends the glove box 1 side inward.

  The sealing plug 23 includes an annular body portion 24 and a bottom plate portion 25 continuous to one end portion of the body portion 24, and an outer edge portion of the bottom plate portion 25 projects outward from the body portion 24 to form a flange portion 26. Has been. The inner diameter of the fixed ring 15 that fixes the inner ring 20 is substantially equal to the inner diameter of the inner ring 20. A locking tongue piece 27 is formed at an appropriate position in the circumferential direction of the body portion 24, and a locking claw 28 as an engaging portion is formed at the tip of the locking tongue piece 27. That is, as shown in FIG. 4, a pair of cuts 29 are formed at appropriate positions on the body 24 at appropriate intervals, and a portion sandwiched between the cuts 29 is a locking tongue piece 27. The locking claw 28 is formed by bending the distal end portion of the locking tongue piece 27 outward. An inclined surface 28a that coincides with the inclined surface 21a of the inner flange 21 is formed at the tip of the locking claw 28.

  As shown in FIGS. 1 and 2, a packing 30 is accommodated in a portion surrounded by the flange portion 26 and the body portion 24 of the inner flange 21 and the sealing plug 23.

  In order to seal the inner ring 20 with the sealing plug 23, the sealing plug 23 is inserted into the inner ring 20 from the outside of the glove box 1. At this time, since the outer diameter of the sealing plug 23 is slightly smaller than the inner diameter of the inner ring 20, it can be inserted while sliding. When the sealing claw 23 is further pushed in with the locking claw 28 in contact with the inner flange 21, the locking tongue piece 27 depends on the relationship between the inclined surface 28a of the locking claw 28 and the inclined surface 21a of the inner flange 21. Is bent and the locking claw 28 is retracted from the region of the inner flange 21. As a result, the locking claw 28 can get over the inner flange 21, and after it gets over, it returns to the position before being bent by the restoring force of the locking tongue 27. Engage with the surface on the one side, and thereafter the sealing plug 23 cannot be pulled out. The packing 30 is appropriately crushed in a state where the locking claw 28 and the inner flange 21 are engaged, and the seal between the sealing plug 23 and the inner ring 20 is achieved.

  In addition, although it seals reliably by using the said packing 30, it can also adhere | attach using an adhesive agent in combination with this packing 30, or without using the packing 30. FIG. That is, by bonding the inner flange 21 and the flange portion 26 of the sealing plug 23, the inner ring 20 and the sealing plug 23 can be sealed.

  A glove box inner ring sealing device according to a second embodiment is shown in FIG. In the second embodiment, a circumferential engagement groove 32 is formed on the inner surface of the inner ring 31. The sealing plug 33 is made of a disk-shaped plate material, and an outer peripheral edge is an engaging portion that engages with the engaging groove 32. An appropriate-shaped packing 34 is attached to the sealing plug 33.

  When the sealing plug 33 is pushed into the inner ring 31, the packing 34 is appropriately compressed, and the sealing plug 33 can be pushed in while sliding against the inner ring 31. When the sealing plug 33 is positioned in the engagement groove 32, the packing 34 is expanded and filled in the engagement groove 32, and the inner ring 31 is sealed.

  According to the glove box inner ring sealing device according to the present invention, the space for storing dangerous substances such as radioactive pollutants is not reduced unnecessarily, and the life of the existing storage equipment is extended. Can do.

It is sectional drawing explaining the sealing device of the inner ring for glove boxes which concerns on 1st Embodiment of this invention, and the state which the inner ring was obstruct | occluded with the sealing plug is shown. In the figure which shows 1st Embodiment, the state just before an inner ring is obstruct | occluded with a sealing plug is shown. It is a top view of the airtight stopper which concerns on 1st Embodiment. It is an AA arrow line view in FIG. It is sectional drawing explaining the sealing apparatus of the inner ring for glove boxes which concerns on 2nd Embodiment of this invention, The state which the inner ring was obstruct | occluded with the sealing plug is shown. It is sectional drawing explaining the structure of a glove port. It is a perspective view explaining the schematic structure of a glove box.

Explanation of symbols

P Driver 1 Glove box 2 Radioactive material handling device 3 Glove port
11 Inner ring
12 Globe
15 Fixed ring
20 Inner ring
21 Inner flange (engagement receiving part)
21a Inclined surface
23 Seal plug
24 Torso
25 Bottom plate
26 Flange
27 Locking tongue
28 Locking claw (engagement part)
28a Inclined surface
29 notches
30 Packing
31 Inner ring
32 Engagement groove (engagement receiving part)
33 Seal plug
34 Packing

Claims (4)

In a glove box in which a glove is attached to the inner ring and various devices housed inside the hazardous substance environment are operated with the glove attached,
An engagement receiver formed on the inner surface of the inner ring;
It has an engagement part that engages with the engagement receiving part, and consists of a sealing plug that is inserted along the inner peripheral surface of the inner ring,
The sealing plug is inserted, and in a state where the engagement receiving portion and the engaging portion are engaged, the sealing plug is fixed in the inner ring, and the inner ring is closed with the sealing plug. Sealing device for inner ring for glove box. The engagement receiving portion is an inner flange provided on the inner surface of the inner ring;
The inner part for a glove box according to claim 1, wherein the engaging part is a locking tongue piece having a locking claw that engages with the inner flange after overcoming the inner flange. Ring sealing device.   3. A glove box inner ring sealing device according to claim 2, wherein a packing is mounted between an outer peripheral portion of the sealing plug and the flange portion. The engagement receiving portion is an engagement groove formed in the circumferential direction on the inner surface of the inner ring,
The engagement portion is an outer peripheral edge portion of a disc-shaped sealing plug, and a packing is interposed in the engagement groove, and the engagement groove and the outer peripheral edge portion engage with each other. The inner ring sealing device for a glove box as described.

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