JPS627822B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for maintaining negative pressure in a laboratory handling hazardous materials. Laboratories that handle dangerous bacteria, viruses, and other recombinant genes that must not be dispersed to the outside world require a system that maintains negative pressure inside the room and prevents dangerous materials from being dispersed outside. However, conventional systems have had drawbacks such as the required equipment being complicated and expensive, and the operation not being reliable. Therefore, in the system of this invention, an attempt is made to eliminate the drawbacks of the conventional system.A front room is attached to the laboratory, a supply air purification device is installed between the laboratory and the front room, and a door leading from the front room to the laboratory is installed. The airtightness of the front room will be high, and the door that enters the front room from the outside will have an opening for ventilation. The laboratory and the outside air are therefore communicated by an opening in the door of the antechamber and a supply air purification device between the antechamber and the laboratory. In addition, the air in the laboratory is exhausted by an exhaust fan installed in the laboratory. When the laboratory is evacuated, outside air is introduced into the laboratory through the opening in the vestibule door and the supply air purifier, but a pressure drop occurs as it passes through the supply air purifier, creating a negative atmosphere in the laboratory. Maintained under pressure. With this system of the invention,
Negative pressure can be maintained reliably in the laboratory with simple equipment, and dangerous substances inside the room can be prevented from scattering outside.

To explain the diagram, the diagram shows an example of the layout around the laboratory to which the system of the present invention is applied.
2 indicates a laboratory, 2 indicates a front room attached to the laboratory, and 3 indicates a changing room adjacent to the front room. 4 is a laboratory door leading from the front room to the laboratory, 5 is a front room door leading from the changing room to the front room, and 6 is a changing room door leading from the outside to the changing room. A supply air purification device 10 is provided between the laboratory room 1 and the front room 2. The laboratory door 4 has high airtightness, the front room door 5 is provided with an opening 11 through which air passes, and the changing room door 6 is similarly provided with an opening 12. Also, in principle, the laboratory door 4 and the front room door 5 should not be opened at the same time. Further, air is discharged from the laboratory 1 through an exhaust purification device 21 by an exhaust fan 22, and purified exhaust gas is discharged from a duct 23. The value of the negative pressure in the laboratory is determined by the magnitude of this discharge amount. Since the air in the laboratory is exhausted by the exhaust fan 22, the outside air enters the front room 2 through the opening 12 of the changing room door and the opening 11 of the front room door, and from there passes through the supply air purification device 10 and enters the laboratory. is supplied with air. Since there is a pressure drop when passing through the supply air purification device 10, a predetermined negative pressure is maintained in the laboratory room.

Since the system of the present invention is constructed as described above, outside air is always supplied to the door openings 11 and 12, and the supply air purifying device 1.
It flows into the laboratory through 0 and does not stay in the front room. Furthermore, when the laboratory door is opened to enter the laboratory, the air in the front room flows into the laboratory from the open door 4 without passing through the supply air purification device 10, which has a high resistance, resulting in a one-way flow of air. is still guaranteed. Also, when leaving the laboratory, even if bacteria or the like is attached to a work table and placed in the front room, the air will not remain in the front room and the contaminants will be transferred to the supply air purification system. be captured. Since the airflow is flowing towards the laboratory,
There is no danger that dangerous substances will be scattered outside from the front chamber, and the air in the front chamber can be purified by the dilution effect of this airflow.

[Brief explanation of the drawing]

The figure shows an example of the layout of a laboratory to which the system of the present invention is applied. Code, 1...Laboratory, 2...Anteroom, 3...Locker room, 4...Laboratory door, 5...Anteroom door, 6...
Changing room door, 10...Air supply purification device, 11, 12
...Door opening, 21...Exhaust purification device, 22...
...Exhaust fan, 23...Duct.

Claims (1)

[Claims] 1. In a laboratory that handles dangerous substances such as bacteria and viruses, this laboratory is equipped with an exhaust gas purification device, an exhaust fan, etc., and a supply air purification device is installed between the laboratory and an attached front room to facilitate experiments. A system for maintaining negative pressure in the laboratory, characterized by the door between the chamber and the front chamber being highly airtight, and the door between the front chamber and the outside having an opening.