JP4055150B2 - Safety cabinet with waste container - Google Patents

Description

  The present invention relates to a safety cabinet that enables waste generated in a working space for handling infectious samples and the like to be moved out of the apparatus without being exposed and diffused.

As shown in FIGS. 1A and 1B , the conventional safety cabinet 101 is formed outside the work space 103 by forming a work space 103 on a work table 102 that enables handling of infectious samples. A circulation air flow is generated by a circulation fan 105 in a circulation path including the flow path 104 and the work space 103, and the air flow is blown out to the work space 103 through an air supply filter 106, and a part of the circulation air flow is outside the cabinet 101. The gas is discharged through the exhaust filter 107. A tray 108 is placed on the work table 102 where the circulating airflow flows, and the infectious sample 109 is processed thereon.

  At this time, the polluted aerosol 111 is contained in the work space 103 by the air flow form of the circulating air flow 110 flowing down into the work space 103, and is prevented from escaping to the outside to prevent aerosol infection (air infection) to experimental workers. . However, in the experiment, infectious waste 112 is generated as a by-product. Therefore, a waste container 113 for storing the waste 112 is placed on the work table 102 as shown in FIG. 1B.

  However, because the waste container 113 partially occupies the area of the work table 102, the operability of the work is deteriorated. Further, the contaminated aerosol 111 is scattered from the waste container 113 to the outside, or the waste container 113. There was a high possibility that the infectious waste 112 would be contaminated on its outer wall.

  In addition, since the installation of the waste container 113 in the working room of the safety cabinet in which the circulating airflow 110 is precisely controlled becomes an obstacle to the airflow, the physical containment performance that is the purpose of the safety cabinet (operator safety) , Sample protection, and prevention of contamination between samples). The waste 112 is finally taken out from the safety cabinet 101, moved to the sterilization apparatus, and discarded after the sterilization process. At the time of carrying out, there is a concern about the possibility of aerosol infection to experiment workers working in the laboratory.

Therefore, a shooter with flaps on a workbench provided, at the opening lower shooter Place the waste accommodating cart, waste narrowing dropped into the basket waste accommodated through the shooter from the work platform, discarded pull the cart as needed Although the thing which takes away an object (refer patent document 1) is devised, the sealing nature of the cart and shooter which receive a waste is not considered in this system, and scattering of a pollutant aerosol etc. may occur in the meantime. Conceivable.

Further, in a safety cabinet having a circulating airflow that lowers the air from the air supply filter from above to below the work space on the workbench and returns the air to the filter through the communication path, the waste container is placed on the workbench. There is a container with a lid provided on the container (see Patent Document 2). When taking out the waste container, this apparatus opens the waste container lid on the workbench and puts the waste container in the working space. You have to pull it up. Therefore, the waste is carried out through the work space, and during that time, contaminated aerosol or the like may be scattered from the waste container into the work room space.
Utility Model Registration No. 3071688 JP 2002-79117 A

  In view of the above points, the present invention enables waste such as infectious waste generated during experiments and other operations to be moved to a sterilization apparatus without being exposed and scattered outside the safe cabinet.

The invention according to claim 1 is a safety cabinet, wherein a clean airflow is jetted into the work space on the workbench to make the work space a clean space, and a waste container storage space is provided at the lower part of the workbench to provide a waste container. A negative pressure air passage discharged from the work space between the storage space and the work table, between the waste input port provided in the work table and the waste container fixing opening of the waste container storage space, across the air passage of negative pressure is provided a connecting tube, closing close to each waste container, a working space and a door, respectively the waste container storage space with a safety lock and close detection sensor provided in the connection tube, Each safety lock and the open / close detection sensor are connected to a control circuit, and when one is open, the other is locked.
According to a second aspect of the present invention, in the safety cabinet according to the first aspect, a door position detection sensor for a door provided in each of the work space and the waste container storage space, and a fan control device for controlling the fan rotation speed Are connected by a control circuit to detect the opening and closing of each door and automatically control the rotation speed of the circulation fan.

  According to the present invention, infectious waste generated as a by-product during experiments or other work on infectious samples in the safety cabinet can be carried out to the treatment site without being exposed to the outside of the safety cabinet. Yes, it was possible to prevent aerosol infection (air infection) due to contaminated aerosol of workers.

The best mode for carrying out the present invention will be described below with reference to the drawings.
The safety cabinet 1 of the present invention forms a work space 3 on a work table 2 that enables handling of infectious samples, and has an air supply hepa filter 4 and an exhaust hepa filter 5 on the upper surface of the work space 3. A circulation fan 6 is provided, a waste container storage space 8 is provided below the work space 3 via an air passage 7, and an air passage 9 connected to the air passage 7 is provided on the back of the work space 3 and the waste container storage space 8. Is provided. Thereby, the circulation path of the work space 3, the air passages 7, 9 and the circulation fan 6 and the air supply hepa filter 4 is configured.

Front doors 10 and 11 are provided on the front surface of the work space 3 and the front surface of the waste container storage space 8, and the front doors 10 and 11 are provided with opening / closing detection sensors 12 and 13, respectively, to detect opening and closing of the doors. . The safety lock 14, 15 is odd regulated such to Midari opened and closed is provided on each door 10, 11.
These open / close detection sensors 12 and 13 and safety locks 14 and 15 are connected to a control circuit 16, and the control circuit 16 is connected to a control device 17 of the circulation fan 6. (Output) is controlled, and the inflow wind speed of both is kept constant. The safety locks 14 and 15 control both the door 10 of the work space and the door 11 of the waste container storage space 8 without opening them simultaneously.

  Class I type safety cabinet requires inflow air speed of 0.4 m / s or more, Class IIA type safety cabinet requires 0.4 m / s or more, and Class IIB type requires inflow air speed of 0.5 m / s or more. It becomes. This apparatus has the performance of containing a Class IIA type or Class IIB type safety cabinet during normal laboratory work, and has the performance of a Class I safety cabinet during work on and off waste containers.

The air flow in the safety cabinet during normal operation circulates because the inflow speed of the front opening 18 shown in FIG. 2 is 0.4 m / s or more for the IIA type and 0.5 m / s or more for the IIB type. The rotational speed (output) of the fan 6 is controlled. Part of the inflow air is purified by the air supply hepa filter 4 and circulates in the cabinet, and part of the inflow air is purified by the exhaust hepar filter 5 and then exhausted outside the safety cabinet.

The work table 2 is provided with a waste inlet 22 having an open / close lid 21. As shown in FIG. 3, the opening / closing lid 21 is opened in a direction orthogonal to the air flow 19 without disturbing the air flow 19 distributed before and after the work space 3. As shown in FIG. 4, the waste inlet 22 is provided with a connecting cylinder 23 formed continuously in the waste container storage space 8 at the lower portion thereof. The connecting cylinder 23 is formed with a slit 24 at the top thereof, that is, at a connecting position between the waste waste inlet 22 and the connecting cylinder 23, and the inside of the connecting cylinder 23 is under a negative pressure during the operation of detaching the waste container 25 described later. The backflow of the contaminated aerosol from the waste into the space 3 is prevented.

The lower end of the connecting cylinder 23 is fixed to the upper part of the waste container storage space 8, and the work table 2 and the waste container storage space 8 are integrated. This portion constitutes a waste container fixing ring 26. A screw is cut in the inner diameter portion of the ring 26 and is screwed with a screw on the outer periphery of a flange 27 provided at the top of the waste container 25 so that the waste container 25 can be fixedly removed from the connecting cylinder 23. Reference numeral 28 denotes a sealing packing. The hepa filter 29 provided in the waste container storage space 8 filters the outside air that has entered the waste container storage space 8 when the door 11 of the waste container storage space 8 is opened, and serves as an air flow path as clean air. It is used for the purpose of sending to the circulation fan 6 through 9.

When the waste container 25 is unloaded from the safety cabinet 1, the unloading outer lid 30 is attached to the waste container 25 in the waste container storage space 8. The outer cover 30 for carrying out has an inverted U-shaped cross section with a handle 31 at the center of the top, and a ring 32 having the same shape as the waste container fixing ring 26 at the lower end of the connecting cylinder 23 is provided at the lower inner edge thereof. Dissipation of the contents can be prevented by fixing the lid 30 to the waste container 25 by screwing the ring 32 to the flange 27 of the waste container 25 removed from the cylinder 23.

  When the waste container 25 is removed, the open / close lid 21 on the work table 2 is closed, and as described above, the inner lid 33 is attached to the waste container 25 inside the waste container storage space 8 and the outer cover 30 for carrying out is screwed. Thus, when the contaminated aerosol is prevented from leaking, and then the front door 10 of the work space 3 is fully closed, the open / close detection sensor 12 of the door 10 shown in FIG. 2 is activated, and the safety of the door 11 of the waste container storage space 8 is secured. At the same time that the lock 15 is unlocked, the control circuit 16 shown in FIG. 2 automatically controls the rotational speed (output) of the circulation fan in order to lock the door 10 of the work space 3 with the safety lock 14 and adjust the pressure in the storage. To do. When the front door 11 of the waste container storage space 8 with the safety lock 15 unlocked is opened, the open / close detection sensor 13 of the door 11 is activated to increase the output of the circulation fan 6 and automatically flow into the opening 18. The wind speed is controlled to 0.4 m / s or more to achieve the containment performance of Class I safety cabinets. The inflow air is purified by a hepa filter 29 installed at the back of the waste container storage space 8 and passes through the air passage 9 and partly circulates in the work space 3 through the air passage 9 in the same manner as the air flow during normal work. However, a part is further purified by the hepa filter 5 and then exhausted to the outside of the safety cabinet 1.

  The waste container 25 to which the inner lid 33 is attached can be safely moved to the sterilizer without being exposed to infectious waste in the laboratory and leaking contaminated aerosol even after being carried out of the safety cabinet.

  This is effective when there is a possibility that harmful infectious wastes may be discharged in the work space.

Sectional drawing of a conventional apparatus. Sectional drawing of a conventional apparatus. Sectional drawing of this invention apparatus. The perspective view of the part of the opening-and-closing lid | cover of this invention apparatus. Sectional drawing of the connection site | part of the work space of this invention apparatus and a waste container storage space. Sectional drawing of a waste storage container.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Safety cabinet 2 Worktable 3 Work space 4 Hep filter for supply 5 Hep filter for exhaust 6 Circulation fan 7,9 Air passage 8 Waste container storage space 10,11 Front door 12,13 Open / close detection sensor 14,15 Safety lock 21 Lid 22 Waste input 25 Waste container 111 Contaminated aerosol 112 Waste

Claims (2)

A clean airflow was jetted into the work space on the work table to make the work space a clean space, a waste container storage space was provided at the lower part of the work table, and the space between the waste container storage space and the work table was discharged from the work space A negative pressure air passage is provided, and a connecting cylinder is provided across the negative pressure air path between the waste inlet provided in the workbench and the waste container fixing opening in the waste container storage space. closing close to each waste container, the working space and the door respectively in the waste container storage space with a safety lock and the opening and closing detection sensor is provided, the result in connection with each safety lock and close detection sensor control circuit safety cabinet one, characterized in that the other is locked while the door opening. The door position detection sensor of the door provided in each of the work space and the waste container storage space and the fan control device that controls the fan rotation speed are connected by a control circuit, and the opening and closing of each door is detected by opening and closing, The safety cabinet according to claim 1, wherein the number of rotations of the circulation fan is automatically controlled.

Images