JPH09168993A - Chamber type glove box - Google Patents

Abstract

(57) [Summary] [Subject] To provide a device that collects and discharges dust such as powder in the working chamber without disturbing it. SOLUTION: Perforated plates 2 and 3 are arranged in an upper portion and a lower portion inside a main body 1 of a glove box to form an upper chamber 4 and a lower chamber 5, and an upper chamber 4 and a lower chamber 5 are formed at corners in the main body 1. A communication passage 7 that communicates with each other is arranged, a nozzle 9 that ejects air along the side wall of the main body 1 is arranged at the lower end of the communication passage 7, and an air supply port 12 that opens to the upper chamber 4 and the center of the lower chamber 5 are arranged. A chamber type glove box in which an exhaust pipe 15 having an exhaust fan 13 is arranged.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a structure of a chamber type glove box, and more particularly to a structure of a glove box which handles powder radioactive substances.

[0002]

2. Description of the Related Art In general, when handling radioactive powder, a glove box is used to prevent exposure of workers. This glove box is usually equipped with an exhaust port at the top of the glove box and an air supply port at the bottom to provide specified ventilation in order to prevent the internal atmosphere and floating fine particles from leaking to the outside. Thus, the inside of the glove box is formed to have a negative pressure, so that the fine particles adhere to and contaminate the inside of the glove box.

Under such circumstances, a method of ventilating the inside of the glove box has been proposed in which air is allowed to flow to the exhaust port provided at the lower corner portion, contrary to the above-mentioned conventional example (Japanese Patent Laid-Open No. 6-347592).

[0004]

By the way, in the conventional ventilation method in the glove box, since the cleaning air mainly flows in the diagonal direction from the lower part to the upper part of the glove box, other than the passage of this air. There is a risk that stagnation will occur at the corners and that turbulent flow that will cause powder scattering will occur.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. An upper chamber and a lower chamber are provided by arranging perforated plates in the upper and lower parts inside the main body of the glove box. And forming a communication passage for communicating the upper chamber and the lower chamber at a corner in the main body, and arranging a nozzle for ejecting air along the side wall of the main body at the lower end of the communication passage, Provided is a chamber-type glove box in which an air supply port opening to the upper chamber and an exhaust pipe having an exhaust fan opening in a central portion of the lower chamber are arranged.

According to the chamber type glove box having the above structure, the main air for cleaning supplied from the air supply port into the main body enters the working chamber in which the powder exists from the upper chamber through the upper porous plate. From here, it will be guided into the lower chamber through the lower porous plate. In this case, the air flow in the work chamber becomes a downward flow of laminar flow (piston flow),
The existing powder can be promptly introduced into the lower chamber without diffusion.

On the other hand, part of the clean air supplied into the upper chamber is introduced into the lower chamber through a nozzle from a communication passage provided in a corner of the working chamber, and this air flow becomes a swirling flow. Since the powder flows, the powder introduced into the lower chamber is easily collected in the central portion by the cyclone action without being diffused in the glove box and is efficiently discharged from the discharge pipe.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the structure of a glove box according to the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a side view of the glove box, and FIG. 2 is a partial cross-sectional view taken along the line AA of FIG. In FIG. 1 and FIG. 2, reference numeral 1 denotes a main body of a glove box, and an upper perforated plate 2 and a lower perforated plate 3 are arranged in an upper portion and a lower portion of the main body 1, and an upper chamber 4 and a lower chamber 5 are vertically arranged. A work chamber 6 is formed between these chambers 4 and 5 while facing each other.

At the four corners of the main body 1, communication passages 7 for communicating the upper chamber 4 and the lower chamber 5 are provided, and air is ejected along the side walls 8 constituting the main body 1 at the lower end of the communication passages 7. The nozzle 9 which does is provided. A pipe material or the like is used for this communication passage 7, and this is fixed to a portion where the two side walls 8 intersect by welding or the like to form a kind of duct.

A part of the communication passage 7 is cut out in the lower chamber 5 into a rectangular shape or a circular shape to form a nozzle 9 so that air is ejected along the side wall 8. The nozzle 9 may be separately manufactured to have a specific performance, and fixed to the communication passage 7. Then, the upper chamber 4 is opened in the upper part of the main body 1,
Further, an air supply port 12 having an air supply fan 10 and an air supply filter 11 is connected, and an exhaust pipe 15 having an exhaust fan 13 and an exhaust filter 14 is opened at the lower part in the center of the lower chamber 5. It is connected.

In the structure of the glove box having the above-mentioned structure, the cleaning air a is sucked while being cleaned by the air supply fan 10 while being cleaned by the air supply filter 11, and is filled in the upper chamber 4, and is rectified by the upper porous plate 2. Work room 6
It is designed to be supplied inside. On the other hand, the air a'dispersedly supplied into the working chamber 6 is rectified by the lower perforated plate 3 and sucked by the exhaust fan 13 via the exhaust pipe 15 and further filtered by the exhaust filter 14 to a proper place. Exhaust.

At this time, the air flow A in the working chamber 6 is
Due to the dispersing action in the upper chamber 4, the rectifying action of the upper porous plate 2, the rectifying action of the lower porous plate 3 and the collective action of the lower chamber 5, a downward flow in the form of a laminar flow (piston flow) is formed, which causes turbulence due to stagnation. There is no flow and therefore no diffusion in the working chamber 7. On the other hand, a part of the cleaning air a introduced into the upper chamber 4 is supplied from the communication passage 7 from the nozzle 9 in a predetermined direction inside the lower chamber 5 and becomes a swirl flow B as a whole. Then, the powder introduced or collected in the lower chamber 5 is collected in the central portion thereof by the cyclone action of the swirling flow B and quickly taken out of the main body 1 through the discharge pipe 15 provided in the lower chamber 5. Then, it is collected by the exhaust filter 14.

In the structure of the glove box,
It is important to form a downward flow A of laminar flow (piston flow) in the working chamber 6, and to make a negative pressure in the main body 1 and to form a swirling flow B in the lower chamber 5.
Therefore, the capacities of the air supply fan 10 provided in the air supply port 12 and the exhaust fan 13 provided in the exhaust pipe 15, the aperture ratios of the upper perforated plate 2 and the lower perforated plate 3, and the opening cross-sections of the communication passage 7 and the nozzle 9, etc. However, it is better to select the appropriate design.

[0014]

As is apparent from the above description, according to the chamber type glove box of the present invention, the laminar flow in the working chamber 6 due to the upper perforated plate 2 and the lower perforated plate 3 provided in the main body 1 ( Since the downward flow A of (piston flow) is formed, the powder present in the working chamber 6 can be promptly introduced into the lower chamber 5 without being diffused, so that the inside of the main body 1 may be contaminated. In addition, the swirling flow B in the lower chamber 5 has the effect of terminating the powder in the central portion and promptly discharging the powder out of the main body 1.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the structure of a chamber type glove box according to the present invention.

FIG. 2 is a partially cutaway view taken along the line AA of FIG.

[Explanation of symbols]

1 Main Body 2 Upper Perforated Plate 3 Lower Perforated Plate 4 Upper Chamber 5 Lower Chamber 6 Working Room 7 Communication Channel 8 Sidewall 9 Nozzle 10 Air Supply Fan 11 Air Supply Filter 12 Air Supply Port 13 Exhaust Fan 14 Exhaust Filter 15 Exhaust Pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Sakuno 5-6-4 Tsukiji, Chuo-ku, Tokyo Within Mitsui Engineering & Ships Co., Ltd. (72) Masaaki Sayawaki 5-6-4 Tsukiji, Chuo-ku, Tokyo Mitsui Shipbuilding Co., Ltd.

Claims (1)

[Claims] 1. A communication passage for connecting perforated plates to an upper part and a lower part of a main body of a glove box to form an upper chamber and a lower chamber, and connecting the upper chamber and the lower chamber to a corner of the main body. A nozzle for ejecting air along the side wall of the main body is arranged at the lower end of the communication passage, and has an air supply port opening to the upper chamber and a central portion of the lower chamber, and has an exhaust fan. A chamber type glove box with an exhaust pipe.