JPH06324195A - Air exhaust unit for glove box - Google Patents

Abstract

PURPOSE:To provide an air exhaut unit by which an air exhaust filter can be replaced easily in the air exhaust unit connected to an air exhaust port of a glove box. CONSTITUTION:A cylindrical casing 10 connected to a negative pressure source through a valve 13 is connected at the front end to an air exhaust port 4 of a glove box l. An installing part 11 of a filter 12 is formed in a front end part of the casing 10, and a cylindrical filter throwing-in port 14 is arranged on an intermediate part upper surface of the casing 10. A raising-lowering member 15 and a push-pressing member 16 are arranged in the casing 10, and after the filter is thrown into the throwing-in port 14 in a condition where a bottom part of the throwing-in port 14 is sealed by the raising-lowering member 15, the filter is lowered into the casing 10 by the raising-lowering member 15, and next, the push-pressing member 16 is advanced, and the filter is pushed in the installing part 11, and a spent filter is pushed out into a glove box 1 from the air exhaust port 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust unit for a glove box that handles radioactive substances and the like.

[0002]

2. Description of the Related Art A glove box, as shown in FIG.
The glove 3 is attached to the operation hole formed in the transparent plate 2 on the front surface of the box body 1, and the glove 3 is put in to handle radioactive substances in the box, and the inside is leaked to the outside. To prevent this, it is necessary to keep the inside of the box at a negative pressure at all times.

Therefore, conventionally, an exhaust line connected to a negative pressure source such as a vacuum pump is connected to the exhaust port 4 of the glove box, and the air in the box is exhausted by the exhaust line while introducing outside air from the air supply unit 5. The negative pressure inside the box is maintained.

The exhaust line is composed of a main line a1 and a bypass line a2, and a valve b is provided on each of the upstream and downstream pipes forming each of the lines a1 and a2, and a high pressure is provided between both pipes. A performance filter c is arranged, and an inlet and an outlet of the filter c are connected to an upstream pipe and a downstream pipe via a vinyl bag d, respectively. Then, normally, the valve b of the main line a1 is opened to exhaust the gas through the main line a1, and the filter c of the main line a1 is discharged.
When it is no longer possible to maintain and manage the negative pressure due to clogging or damage to the filter, or when the dose rate of the filter c rises, the valve b of the bypass line a2 is opened and exhaust is performed through the bypass line a2. Therefore, the valve b of the main line a1 is closed to replace the filter c.

When the filter c is replaced, first, as shown in FIG.
As shown in (a), the middle part of the vinyl bag d'of the filter c'to be replaced is sealed and cut, and the open end of each pipe is closed by the half part of the vinyl bag d '.
As shown in (b), a new filter c is replaced, and a vinyl bag d with gloves g attached to the outflow inlet of the filter c is attached to each pipe so as to cover the previous vinyl bag d ′, The above-mentioned banile bag d'is removed from the pipe by using the gloves e, and then the gloves e are sealed and cut off as shown in FIG. .

In the figure, a3 indicates a damper line provided in parallel with the exhaust line, and a pre-filter f for introducing outside air to the line a3 in order from the upstream side, a damper g which opens and closes according to the strength of the negative pressure, and a high performance. With the filter h and the valve i interposed, an excessive increase in the negative pressure in the exhaust line is caused by the damper line a3.
It is designed to be prevented by the introduction of outside air through.

[0007]

It takes time and effort to replace the filter in the conventional exhaust line, and it is necessary to replace the filter with a case with an element housed in a case having an outlet / inlet port. And, in addition,
Not only the filter but also the vinyl bag used as a joint member is handled as a consumable item, so that the amount of radioactive waste generated when the filter is replaced increases, and the disposal process becomes troublesome.

In view of the above points, an object of the present invention is to provide an exhaust unit for a glove box which facilitates the filter replacement work and reduces the amount of waste.

[0009]

[Means for Solving the Problems] In order to achieve the above object,
The present invention is an exhaust unit that is connected to an exhaust port of a glove box to maintain a negative pressure inside the glove box, and includes a tubular casing pipe-connected to a negative pressure source,
A filter mounting portion is provided at the end of the casing that is connected to the exhaust port, and a cylindrical filter inlet with an opening / closing lid attached to the upper end is provided on the upper surface of the intermediate portion of the casing. An elevating member that can be raised and lowered to an ascending position that supports the filter that has been introduced into the casing such that the bottom of the introducing port is sealed and a descending position that lowers the filter into the casing, and the filter that has the descended filter inside the casing installed. And a pressing member which is pushed into the portion and is movable back and forth in the axial direction of the casing.

[0010]

[Operation] Normally, the elevating member is moved upward to the raised position,
In this state, the filter is inserted into the filter inlet. At this time, the opening / closing lid at the upper end of the filter inlet is opened, but since the bottom of the filter inlet is closed by the elevating member in the raised position, the negative pressure in the casing, that is, the glove box is maintained.

Next, the elevating member is moved downward to lower the filter into the casing, and then the pressing member is advanced to push the filter into the filter mounting portion. At this time, the used filter attached to the filter attachment portion is pushed by the filter and pushed out into the glove box through the exhaust port. Then, the used filter is taken out from the glove box by the same method as the method of taking out the radioactive material handled in the glove box, and the replacement work is completed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 10 denotes a tubular casing constituting an exhaust unit, which is hermetically connected to an exhaust port 4 formed on a side surface of a box body 1 of a glove box.

A medium-performance prefilter 6 is provided in the box body 1 so as to cover the exhaust port 4 from the inside.
Further, a filter mounting portion 11 is formed at a portion on the front end side of the casing 10 which is a connection end to the exhaust port 4, and the mounting portion 1
1 is equipped with a high-performance filter 12, and the casing 10 is connected to a negative pressure source (not shown) such as a vacuum pump via a valve 13 at the rear end side portion thereof via a valve 13 to remove air in the glove box from both the filters 6 , 12 was evacuated to maintain a negative pressure inside the glove box.
The pre-filter 6 is mounted on the filter frame 7 which is openably and closably attached to the inside of the box body 1 via a hinge 7a. When replacing the filter 12, which will be described later, the gloves of the glove box must be put in a hand and the filter frame 7 Locking member 7b
Is released and the filter frame 7 is opened.

A cylindrical filter inlet 14 having an opening / closing lid 14a at the upper end is provided on the upper surface of the intermediate portion of the casing 10, and the filter inlet 1 is further provided inside the casing 10.
A plate-like elevating member 15 capable of elevating and lowering is provided at an ascending position for sealing the bottom of No. 4 and a lower surface of the filter mounting part 11 and a descending position at a substantially level.

The elevating member 15 is a hollow rod 1 vertically extending from the elevating member 15 on a guide sleeve 15a which is erected in a bottomed cylindrical bulging portion 10a on the lower surface of the intermediate portion of the casing 10.
5b, which is supported so as to be able to move up and down, and is formed in the guide sleeve 15a at the lower end of the rod 15b.
5d is provided with a screw shaft 15d to be screwed, and thus the screw shaft 1
By rotating 5d with the handle 15e at the lower end thereof, the elevating member 15 is moved up and down via the rod 15b.

Further, in the casing 10, the lifting member 1
From the retracted position rearward of the ascending / descending trajectory of 5, the filter mounting portion
A plate-shaped pressing member 16 is provided that is movable toward and away from the casing 10 in the axial direction of the casing 10. The pressing member 16
Is supported by a guide sleeve 16a provided on a rear end side portion of the casing 10 so as to be movable back and forth in the front-rear direction via a hollow rod 16b extending rearward from the pressing member 16, and the rod 16b is inserted into the guide sleeve 16a. A screw shaft 16d screwed into the female screw portion 16c formed at the rear end is provided, and the pressing member 16 is advanced and retracted via the rod 16b by rotating the screw shaft 16d with the handle 16e at the rear end. The pressing member 16 is formed of a punching board in which a plurality of through holes are formed so as not to interfere with exhaust.

A damper cylinder 17 is vertically provided on the lower surface of the rear end portion of the casing 10, and a middle-performance prefilter 18, a damper 19, and a high-performance filter 20 are mounted on the cylinder 17 in order from the lower end. When the negative pressure in the casing 10 increases, the damper 19 is opened against the weight 19b attached to the shaft 19a of the damper 19 to prevent the negative pressure from increasing excessively.

The filter 12 mounted on the filter mounting portion 11 of the casing 10 described above does not need to be a filter with a case because the casing 10 also functions as a filter case. Therefore, the filter 12 can be downsized and the whole combustible. It can also be formed of a material, which facilitates disposal processing. In this embodiment, a seal ring 12a is attached around the filter 12 so that the filter 12 can be airtightly attached to the filter attachment portion 11.

Next, the operation of the above embodiment will be described. Normally, the elevating member 15 is placed in the raised position and the pressing member 16 is placed in the retracted position, and the air in the glove box is sucked and exhausted through the pre-filter 6 and the filter 12 by the operation of the negative pressure source, and the inside of the glove box is Maintain negative pressure.

When the filter 12 is replaced, first, the opening / closing lid 14a at the upper end is opened in the filter inlet 14 to insert a new filter 12. Even if the opening / closing lid 14a is opened, the elevating member 15 still in the raised position causes the filter inlet to be opened. Since the bottom of 14 is sealed, the inside of the casing 10 and the inside of the glove box are maintained at a negative pressure.

After the filter is inserted, the opening / closing lid 14a is closed, and then the handle 15e for the elevating member 15 is operated to move the elevating member 1
5 is lowered to the lowered position, and the new filter 12 is lowered into the casing 10 while being supported by the elevating member 15 as shown in FIG.

Next, the filter frame 7 of the pre-filter 6 is opened using the glove of the glove box, and the pressing member 1
6 is moved forward by operating the handle 16e to move the lifting member 15
The new filter 12 on the upper side of FIG.
As shown in (b), it is pushed into the filter mounting portion 11, the used filter 12 mounted on the mounting portion 11 is pushed out from the exhaust port 4 into the glove box, and the same method as the method of taking out radioactive substances from the glove box is obtained. Collect the used filter by the method of. After that, the filter frame 7 is closed, the pressing member 16 is further retracted, and the elevating member 1
5 is returned to the state of FIG. 1 and the replacement work of the filter 12 is completed.

[0023]

As is apparent from the above description, according to the present invention, the replacement work of the filter can be performed easily and efficiently, and further, the filter need not be a filter with a case and can be used for the filter. A joint member is also unnecessary, the amount of waste generated by replacing the filter can be reduced as much as possible, and the disposal process becomes easy.

[Brief description of drawings]

FIG. 1 is a cutaway side view of an example of an exhaust unit of the present invention.

2 (a) and (b) are views for explaining a filter replacement work procedure.

FIG. 3 is a diagram showing a conventional example.

4 (a), (b) and (c) are views showing a procedure for replacing a filter of a conventional example.

[Explanation of symbols]

 1 Box Main Body 4 Exhaust Port 10 Casing 11 Filter Mounting Part 12 Filter 14 Filter Input Port 14a Opening / Covering Door 15 Elevating Member 16 Pressing Member

Claims (1)

[Claims] 1. An exhaust unit connected to an exhaust port of a glove box for maintaining a negative pressure in the glove box, comprising a tubular casing pipe-connected to a negative pressure source, and the exhaust port of the casing. The filter mounting part is provided at the end on the connection end side with respect to, and a cylindrical filter inlet with an opening / closing lid attached to the upper end is provided on the upper surface of the middle part of the casing, and the filter inserted into the filter inlet is inserted in the casing. An elevating member that can be raised and lowered to an ascending position for sealingly supporting the bottom of the inlet and a descending position for descending the filter into the casing, and the filter descended into the casing is pushed into the filter mounting portion. An exhaust unit for a glove box, which is provided with a pressing member that can move back and forth in the axial direction.