JPH0763387A - Atmosphere suction device for safety cabinet - Google Patents

Abstract

PURPOSE:To eliminate contact of the air to be input from an exterior into an operating space with a specimen placed on an operating base. CONSTITUTION:A safety cabinet has a cabinet body 1 having an openable door 3 on a front surface to form an operating space 2 therein, a high performance filter 6 provided at one side of the space 2 of the body 1, a blower 7 for blowing the air under pressure to the filter 6, and an operating base having a plurality of pores 8 in which the air is passed to the other side. The body 1 has a communicating passage 10 for sucking the air sucked from the pores 8 of the base by the blower 7, and an exhaust passage for discharging the air out of the body 1 to a leeward side of the blower 7 through the filter 11. The pores 8 of the base are provided in parallel with the door 3 at the door 3 side, and formed at an oblique surface 17 of a recess 15 formed at a position lower than the installation surface to be placed with the specimen 4 such as a sample of the base. The surface 17 is opposed to an opening 16 of the door 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outside air suction device for a safety cabinet which is suitable for use in prevention of disasters (biohazard) associated with microbial experiments.

[0002]

2. Description of the Related Art Conventional safety cabinets are biohazard countermeasure products that incorporate a high-performance filter to handle dangerous pathogens and unknown microorganisms from genetic recombination experiments, and always supply clean air to the working space. In addition, a negative pressure is constantly applied to the working space to allow outside air to flow in through the opening of the opening / closing door to prevent infection of the experimenter due to leakage of the pathogen or the like outside the cabinet (for example, Jikken Sho 54). -16395).

[0003]

However, in the conventional safety cabinet, since the opening of the opening / closing door and the suction hole on the front surface of the work table are orthogonal to each other, the outside air flowing in through the opening is used for suction. There is a problem that it becomes difficult for the sample to enter the holes and some of the outside air directly contaminates the sample.

The present invention solves the above problems,
It is an object of the present invention to provide a safety cabinet that prevents infection of an experimenter from the inside of a work space where a sample sample such as a pathogen or a microorganism is handled and contamination of the sample sample by the outside air.

[0005]

SUMMARY OF THE INVENTION The present invention includes a cabinet body having an opening / closing door on the front surface and forming a working space therein,
A work having a high-performance filter provided on one side of the work space of the cabinet body, a blower for sending air to the high-performance filter under pressure, and a hole which is arranged on the other side of the work space and through which air in the work space passes. And a communication passage for sucking the air that has flowed out of the holes of the work table by the blower in the cabinet body, and the air is discharged to the outside of the cabinet body through a high-performance filter on the leeward side of the blower. In a safety cabinet provided with a passage, a hole for air suction of the workbench is provided on the front surface of the opening / closing door side in parallel with the door, and is lower than the installation surface on which a specimen such as a sample sample of the workbench is placed. It is provided on the inclined surface of the recess.

Further, according to the present invention, a cabinet body having an opening / closing door on the front side to form a working space therein, a high-performance filter provided on one side of the working space of the cabinet body, and air to the high-performance filter are provided. A blower for pressure feeding and a work table arranged on the other side of the work space and having a hole through which the air in the work space passes, and a connecting device for sucking air flowing out from the hole of the work table by the blower to the cabinet body. In a safety cabinet in which a passage is provided and a discharge path for discharging air through a high-performance filter is provided outside the cabinet body on the lee side of the blower, an air suction hole of the workbench is provided on the side of the opening / closing door. Provided in parallel with this door on the front surface, provided on the inclined surface of the recessed portion that is recessed at a position lower than the installation surface where the sample such as the sample of the working table is placed,
This inclined surface is opposed to the opening of the opening / closing door.

[0007]

The present invention is constructed as described above,
A suction hole for sucking the outside air flowing into the safety cabinet from the opening of the opening / closing door is formed on the inclined surface of the recess recessed to a position lower than the work installation surface, and the outside air flowing in from the opening is the work installation surface. The sample is placed so that it does not flow directly into the sample.

Further, according to the present invention, the inclined surface of the recess provided with a hole for suction is made to incline and face the opening of the opening / closing door so that the outside air flowing from the opening can easily flow into the recess.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a safety cabinet showing an embodiment of the present invention.

Reference numeral 1 denotes a cabinet main body, which has a working space 2 for working in the center of the inside of the cabinet main body, and a transparent door 3 which can be opened and closed vertically is provided on the front surface thereof.
A work table 5 for placing a specimen 4 such as a pathogen or an unknown microorganism by a genetic recombination experiment on the upper surface is installed below one side of the working space 2, and a high-performance filter 6 for circulation is installed above the other side. Above the high-performance filter 6, there is provided a blower 7 for ventilating the filter.

A plurality of small holes 8 for air intake are formed along the door 3 on the front side of the work table 5. The space 9 on the lower side of the work table 5 communicates with the space 12 on the upper blower 7 side via a communication passage 11 between the partition wall 10 and the cabinet body 1. Below the partition wall 10, the inside of the work space 2 and the communication passage 11 are provided.
A small hole 13 for communicating air with is opened.

In the working space 2, the air pressure-fed by the blower 7 through the high-performance filter 6 is blown downward from above. In addition, a part of the air pressure-fed from the blower 7 is exhausted to the outside of the cabinet main body 1 through the high-performance exhaust filter 14 provided above the cabinet main body 1, and the contaminated air in the cabinet main body 1 is removed. It is designed so that it is not discharged outside the cabinet body.
The high-performance filter 6 allows the air pressure-fed from the blower 7 to pass therethrough, so that the pressure in the work space 2 becomes lower than that in the outside of the cabinet body 1. The same amount of air as the air exhausted from the exhaust high-performance filter 14 is supplied into the work space 2 by the blower 7 from the opening of the door 3 as indicated by the arrow.

By changing the pressure loss ratio between the high-performance filter 6 for circulation and the high-performance filter 14 for exhaust, the circulation rate of the air circulating in the working space 2 is 70% to 30%.
It can be adjusted to.

The opening of the door 3 is set so that the hands of the experimenter can enter the work space 2 and the experimenter can visually observe the sample 4 through the transparent door 3.

Reference numeral 15 denotes a recess provided in parallel with the door 3 on the front side of the workbench 5, and this recess is provided at a position lower than the position on the workbench 5 on which the sample 4 is placed. Door 3 in recess 15
An inclined surface 17 that is inclined and faces the opening 16 is provided. Further, a plurality of small holes 8 for suction are formed in this inclined surface.

Reference numeral 18 is a cover for covering the small hole 13 for suction,
This cover guides the air flowing out from the work space 2 downward so that the air flowing from the front small hole 8 into the space 9 below the work table 5 does not enter the work space 2.

In the outside air suction device of the safety cabinet thus constructed, the air in the space 12 is sucked and pressure-fed by driving the blower 7. The pressure-fed air is divided into a high-performance filter 6 for circulation and a high-performance filter 14 for exhaust, and flows. Then, the air passing through the high-performance filter 6 for circulation is cleaned, flows in the working space 2 from the upper side to the lower side, and cleans the atmosphere of the sample 4 placed on the working table 5. In addition, the air passing through the high-performance exhaust filter 14 removes substances contaminated by the sample 4 and cleans the air to be discharged to the outside of the cabinet body 1.

The air in the work space 2 flows out from the small holes 8 of the work table 5 and the small holes 13 of the partition wall 10 into the space 9 below the work table 5 by suction of the blower 7, and the communication passage of the partition wall 10 is formed. The space 12 on the side of the blower 7 is reached through 11.

The work space 2 has a high-performance filter 14 for exhaust.
The amount of air blown to the high-performance filter 6 for circulation is reduced by discharging a part of the air sucked by the blower 7 to the outside of the cabinet main body 1 via the fan, and the pressure in the work space 2 is reduced. Is being pursued. And the work space 2 is the door 3
The outside air is introduced into the cabinet body 1 through the opening 16 so that the air contaminated with the sample 4 placed on the workbench 5 is not discharged to the outside through the opening 16.

A small hole 8 for sucking the outside air introduced into the cabinet main body 1 through the opening 6 of the door 3 is provided in parallel with the door and is a recess provided at a position lower than the position where the sample 4 is placed on the front surface of the workbench 5. By opening it on the inclined surface 17 of the place 15, the air blower 7 is made substantially orthogonal to the inside of the space 9 on which the suction force acts so that the air flow into the recess does not directly contact the specimen 4 of the workbench 5 with the outside air. I have to.

Further, since the small hole 8 for suction is provided on the inclined surface 17 of the recess 15, the suction area can be reduced without reducing the installation space of the specimen 4 as compared with the case where it is provided on the flat surface of the work table 5. Can be made larger.

[0023]

As described above, according to the present invention, a cabinet body having an opening / closing door on the front surface to form a working space therein, and a high-performance filter provided on one side of the working space of the cabinet body, An air blower for sending air to the high-performance filter under pressure, and a work table which is arranged on the other side of the work space and has a hole through which air in the work space passes, and the blower blows to the cabinet body from the hole of the work table. In a safety cabinet having a communication passage for sucking out the outflowing air and a discharge passage for discharging air through a high-performance filter outside the cabinet body on the lee side of the blower, an air suction hole of the workbench Is provided on the front surface of the opening / closing door side in parallel with the door and is provided on the inclined surface of the recessed portion which is recessed at a position lower than the installation surface on which the specimen such as the sample sample of the work table is placed. The inside of the work space can be made to have a negative pressure and the air flowing into the work space from the opening of the door can be guided to the recess, so that the air flowing in from the opening comes into contact with the sample placed on the workbench. It can be surely prevented.

Further, according to the present invention, the air intake hole of the workbench is provided on the front surface of the opening / closing door side in parallel with the door and at a position lower than the installation surface on which the specimen such as the sample sample is placed on the workbench. Since it is provided on the inclined surface of the recessed portion and this inclined surface is opposed to the opening of the opening / closing door, the air flowing in from the opening can be smoothly guided to the small hole provided on the inclined surface of the recess. Therefore, it is possible to reliably prevent the specimen from being contaminated by the air flowing in from the opening.

[Brief description of drawings]

FIG. 1 is a sectional view of a safety cabinet showing an embodiment of the present invention.

[Explanation of symbols] 1 cabinet body 2 working space 3 door 5 working table 6 high-performance filter 7 blower 8, 13 small hole 11 communication passage 15 recess 17 slanted surface

Claims (2)

[Claims] 1. A cabinet main body having an opening / closing door on the front surface to form a working space therein, a high-performance filter provided on one side of the working space of the cabinet main body, and a blower for sending air to the high-performance filter under pressure. And a work table arranged on the other side of the work space and having a hole through which air in the work space is provided, and the cabinet main body has a communication passage for sucking air flowing out from the hole of the work table by a blower. In the safety cabinet in which the exhaust passage for exhausting air through the high-performance filter is provided outside the cabinet body on the leeward side of the blower, the hole for air intake of the workbench is provided on the opening / closing door side. It is provided in parallel with this door on the front surface of the work table and is provided on the inclined surface of the recessed portion which is tilted to a position lower than the installation surface on which the sample such as the sample is placed. An outside air suction device for a safety cabinet characterized by: 2. A cabinet main body having an opening / closing door on the front surface to form a working space therein, a high-performance filter provided on one side of the working space of the cabinet main body, and a blower for sending air to the high-performance filter under pressure. And a work table arranged on the other side of the work space and having a hole through which air in the work space is provided, and the cabinet main body has a communication passage for sucking air flowing out from the hole of the work table by a blower. In the safety cabinet in which the exhaust passage for exhausting air through the high-performance filter is provided outside the cabinet body on the leeward side of the blower, the hole for air intake of the workbench is provided on the opening / closing door side. It is provided in parallel with this door on the front surface of the work table, and is provided on the inclined surface of the recess that is inclined and recessed to a position lower than the installation surface on which the sample such as the sample is placed. An outside air suction device for a safety cabinet, wherein the slope is inclined and faces the opening of the opening / closing door.