JPH09168992A - Glove box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover and discharge powder desirably by disposing air supply headers with a plurality of air supply holes at the upper corner part in a body of a glove box, and providing an exhaust port at the bottom face center part of the body through dust collecting devices. SOLUTION: Air is led into air supply headers 4, 5 from intake ports 6, 7 and supplied into a body 1 according to the state of negative pressure from intake ports 11a, 11b provided at the air supply headers 4, 5. The air supplied into the body 1 flows down in the overlapped state of horizontal flow A flowing along a ceiling from the intake port 11a and vertical flow B flowing along a side wall from the intake port 11b, and is led to an exhaust port 13 disposed outside of the lower part of the body while collecting powder at dust collecting devices 12a, 12b provided at a bottom part.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, when handling radioactive powder,
Glove boxes are used to prevent workers from being exposed to radiation. By the way, this glove box
Fine particles are generated due to crushing of radioactive materials and are scattered.The inside of the glove box is kept at a negative pressure to prevent the fine particles from leaking to the outside. Will be done. As a solution to this, ventilation is always performed at intervals of about 10 to 20 times / hr.

In the conventional ventilation method in the glove box, the air supply port is provided at one corner of the lower support plate, and the air is exhausted from the exhaust port provided at the corner of the ceiling on a diagonal line. Has been done. That is, air is taken in from one corner of the lower part of the glove box, and is exhausted while causing a flow that obliquely crosses the glove box upward. However, according to this exhaust method, the air in the glove box flows obliquely upward from the lower part, so the powder that has accumulated or is being accumulated at the bottom tends to rise upward, and as a result, the powder will not be contained in the glove box. There is a problem of scattering all over.

Therefore, contrary to the above-mentioned conventional example, a glove box in which an air supply port is provided at an upper corner portion and an exhaust port is provided obliquely below so that air flows through the exhaust gas obliquely provided A ventilation method for the inside has been proposed (JP-A-6-
347592).

[0005]

By the way, in the ventilation method in the glove box as described above, since the cleaning air mainly flows on the diagonal line of the glove box, corners other than the corners through which the air flows, particularly the air. The air flow does not act on the powder existing in the triangular part above the air flow from the ceiling part on the opposite side of the mouth, and the powder is collected and discharged well, and the gas in the glove box is uniformly discharged. There is a problem that you can not.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the above-mentioned conventional glove box, and has a plurality of air supply holes at the upper corners in the body of the glove box. The present invention provides a glove box in which an air header is disposed, an exhaust port is provided on the bottom surface of the main body through a dust collector, and the air supply header is provided with an air supply port protruding outside the main body.

As the dust collector, an electric dust collector that utilizes electrostatic properties is used in addition to the high performance particle filter. Further, a plurality of air supply holes are arranged in the air supply header so as to open in the longitudinal direction and in the horizontal and vertical directions.
According to the glove box having such a structure, the cleaning air supplied from the air supply port into the air supply header is supplied into the glove box from the plurality of air holes opened in the horizontal direction and the vertical direction. The air flow along the ceiling inside the glove box and the air flow along the walls inside the glove box flow as if to shower from the ceiling, and are exhausted through a dust collector located in the center of the bottom surface. Since it is guided to the outlet, the turbulence of the air flow inside is extremely small, and as a result, there is almost no scattering of powder, and the powder is collected and collected by the dust collector in the glove box, which is safe. Is greatly improved.

[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 FIG. In FIG. 1, reference numeral 1 denotes a main body of a glove box arranged on a base 2, and a main body 1 is provided with a glove hole 3 and a viewing window (not shown).

In the front and rear corners of the upper part of the main body 1,
Air supply headers 4 and 5 each having a rectangular cross section are provided sideways. The air supply header may be arranged on the remaining two sides as required. The air supply headers 4, 5 are provided with air supply ports 6, 7 protruding above the main body 1.
Are installed respectively, and the air supply ports 6 and 7 are provided with filter boxes 9 and 10 having a filter 8 to provide air in the room,
In some cases, the outside air is filtered by the filter 8 and supplied.

In the air supply headers 4 and 5, a plurality of air supply holes 11a which are opened horizontally or laterally and a plurality of air supply holes 11b which are opened vertically or vertically are provided in the longitudinal direction of the air supply headers 4 and 5, respectively. They are arranged in rows, and the supply air is jetted in the horizontal direction and the vertical direction, and these are collectively supplied downward from the entire surface of the ceiling portion of the main body 1 while maintaining a state of little turbulence. .

On both sides of the central portion of the bottom surface of the main body 1, for example, a dust collecting device 12 such as an electrostatic precipitator utilizing a charging property.
a and 12b are provided. And this dust collector 12a,
The outlet 13 is connected to the outlet of 12b.
Is provided with a suction device such as a suction fan (not shown), and the suction device holds the inside of the body 1 at a negative pressure to suck and supply air from the air supply headers 4 and 5 into the body 1. A directional air flow is generated.

When positively pressurized air is supplied from the air supply headers 4 and 5, a natural flow cannot be performed in the main body 1, and the air that is not flowing is positively directed. There is a problem that a turbulent flow is likely to occur due to the accompanying flow down, and the present invention does not employ such a supply method of supply air. In this configuration, when the air in the main body 1 is sucked from the suction device (not shown) via the outlet 13 as described above, the filter 8 provided on the upper portion of the main body 1
The air purified by is introduced into the air supply headers 4 and 5 through the air supply ports 6 and 7, and the air is supplied from the air supply holes 11a and 11b provided in the air supply headers 4 and 5 according to the negative pressure state. It is supplied into the main body 1.

The air supplied into the main body 1 has a horizontal flow A flowing from the air supply hole 11a along the ceiling and the air supply hole 11a.
The vertical flows B flowing along the side wall from b are overlapped and flow down. And the dust collector 1 provided at the bottom
While the powder is collected by 2a and 12b, it is guided to the discharge port 13 outside the lower part of the main body. In this case, the dust collector 12a,
An electric dust collector is used as 12b in addition to the high-performance particle filter.

[0014]

As is apparent from the above description, the glove box of the present invention is provided with a horizontal flow A along the ceiling and a vertical flow B along the side wall from the air supply header provided in the upper corner of the glove box. An air flow is formed so that the air flow is formed, and a discharge port is provided in the central portion of the bottom face through a dust collector to suck and discharge this air.

Therefore, the air flow flows downward from the upper side without generating a large turbulence. As described above, since the air flow in the main body forms a flow due to negative pressure, it becomes a flow whose direction is passively determined and is not stirred, and becomes a laminar flow or a flow close to this. Since the powder is discharged along with the air flow as described above, this powder is not scattered and the inside of the main body is not polluted, and the powder can be collected inside the main body, so it is safe. There is an effect that the property can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a glove box according to the present invention.

[Description of sign]

1 Main Body 2 Base Body 3 Globe Hole 4,5 Air Supply Header 6,7 Air Supply Port 8 Filter 9,10 Filter Box 11a, 11b
Air supply holes 12a, 12b Dust collector 13 Discharge port

Front Page Continuation (72) Inventor Masaaki Kowaki 5-6-4 Tsukiji, Chuo-ku, Tokyo Mitsui Engineering & Shipbuilding Co., Ltd.

Claims (3)

[Claims] 1. An air supply header having a plurality of air supply holes is provided at an upper corner in a main body of a glove box, and an exhaust port is provided at a central portion of a bottom surface of the main body through a dust collector, and the air supply header is provided. A glove box characterized by a series of air supply ports protruding outside the main body. 2. The dust collector according to claim 1, wherein an electric dust collector that utilizes electrostatic properties is installed as the dust collector. 3. The air supply header according to claim 1, wherein the air supply holes are arranged so as to open in a horizontal direction and a vertical direction.