JP2009119391A - Safety cabinet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety cabinet which allows an IT device such as an electronic device to be introduced into the work space of the cabinet by its structure preventing the penetration of a sterilizing gas into an electronic component to protect it from being deteriorated even when the cabinet is filled with the gas. <P>SOLUTION: An air passage for the exclusive use of the electronic component is formed to surround the electronic component arranged in the safety cabinet, and a sealable door is set in the air entrance of the passage. An effect to prevent the damage of the electronic device is obtained by sterilization work to annihilate biological material-pathogens treated in the safety cabinet. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a clean work table for preventing disasters caused by the handling of biological materials and pathogens in industrial fields such as medical treatment, pharmaceuticals, handling pathogens, genetic manipulation, so-called biohazard countermeasure class II (Roman numerals) This relates to the use of electronic component equipment in a safety cabinet (hereinafter referred to as a safety cabinet).

  Conventionally, a biohazard class II safety cabinet conforming to or conforming to JIS K3800 has been used as a primary barrier for physically separating biohazardous people / environments and biological materials / pathogens. As a basic performance of the safety cabinet, there is a "worker safety" function that prevents the experimenter from being infected with pathogens. This is a function obtained by maintaining the predetermined air velocity by the inflow airflow flowing through the front opening in front of the work space.

  Biological materials and pathogens are handled in the safety cabinet, but in recent years, there is a need to put electronic devices such as a microscope and a liquid crystal monitor screen for medical chart confirmation into the working room of the class II cabinet.

  Also, whether the inflow airflow of the safety cabinet maintains a predetermined wind speed can be managed by placing electronic components such as a wind speed sensor in the safety cabinet and displaying the wind speed value, or sending air according to the detected wind speed. There is a demand to control fan performance as a means and maintain a predetermined wind speed.

  As shown in Patent Document 1 (Japanese Patent Laid-Open No. 2006-122816), a method for arranging a liquid crystal monitor screen in a work chamber according to the prior art is as follows. There was a method of arranging the main body of the screen in the air flowing part behind the work room.

JP 2006-122816 A

  In the prior art safety cabinet, biological materials and pathogens handled in the work space ride on the air flow and are filtered by an air cleaning means such as a HEPA filter. When the HEPA filter is clogged with dust, it becomes difficult for air to flow, and therefore it is necessary to replace the HEPA filter periodically. When replacing the HEPA filter, the biological material / pathogen is attached to the HEPA filter, so the safety cabinet is filled with a gas that kills the biological material / pathogen, and the biological material / pathogen is treated (hereinafter referred to as sterilization). )There is a need to. Formalin, hydrogen peroxide gas, etc. are used as the gas that kills biological materials and pathogens. When an electronic device such as a liquid crystal monitor screen is placed in the safety cabinet, gas that kills the pathogen is also present around the electronic device. A general electronic device has a structure in which outside air enters the electronic component in order to cool the electronic component. When the gas that kills the biological material is filled in the safety cabinet, the gas naturally touches the electronic components in the safety cabinet. The wiring pattern of general electronic equipment is made of copper, so that the wiring pattern is damaged by ammonia gas filling the safety cabinet in order to neutralize formalin after killing the pathogen with formalin. There was a possibility. For this reason, when using electronic components in a safety cabinet, they must be used with the knowledge of damage or work that does not require killing biological materials and pathogens.

  The purpose of the present invention is to provide a safety cabinet for biohazard measures that does not damage the electronic equipment used in the safety cabinet even if gas is filled in the safety cabinet for the purpose of killing biological materials and pathogens in the safety cabinet. There is to do.

In order to solve the above problems, the present invention is configured as follows.
Another flow path is provided so as to surround the electronic parts arranged in the working space or the air flowing portion of the exhaust system, and a sealable door is provided at the air inlet / outlet.

  By implementing the present invention, even if an electronic device is used in a safety cabinet, a biohazard safety cabinet is provided in which the electronic device is not damaged by a sterilization operation that kills biological materials and pathogens handled in the safety cabinet.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a structural diagram showing a safety cabinet showing the first, second, third, and fourth embodiments of the present invention.

  The operator inserts his / her arm through the front opening 10 of the safety cabinet 1, looks into the work space 3 from the front shutter 9, and performs the work of handling the bacteria / viruses 15 in the work space 3. Bacteria and viruses 15 are removed from the air sucked from the front opening 10 by the HEPA filter, and exhausted from the exhaust port 22. The speed of the inflow air 13 at the front opening 10 is referred to as an inflow air speed 13a, and the air speed value is an important management index for isolating the work space 3 and the space outside the safety cabinet 1.

  FIG. 2 is a cross-sectional structure diagram showing the safety cabinet showing the first embodiment of the present invention.

  The air 13 sucked from the front opening 10 passes through the circulation passage 7 at the bottom of the work table 2 and the back of the work space 3 and is sucked into the blower 6. A region on the suction side of the blower 6 through which the contaminated air passes is referred to as a negative pressure contamination plenum 14. The air sucked into the blower 6 is pressurized in the pressure chamber 18, partly filtered by the air supply HEPA filter 5, as clean air in the work space 3, and the other part by the exhaust HEPA filter 4. It is filtered and discharged out of the device as clean air. The blown air flow 12 supplied into the work space 3 cleans the work space 3, partly sucked from the front suction slit 16 and the other part from the rear air suction port 17, passing through the circulation channel 7. The air is sucked into the blower 6.

  Although it is important for the performance of the safety cabinet not to infect the bacteria and virus 15 handled by the worker inside, this function is to isolate the air between the work space 3 and the outside of the safety cabinet 1 by the air barrier 11. Obtained by.

  In the first embodiment, the television monitor 19 is disposed on the back of the work space through the work space 3 and the circulation flow path 7, and the bacteria / viruses 15 are handled while viewing the monitor screen from the work space 3 side. I am trying to experiment.

  In the circulation flow path 7, the television monitor back surface 19 a protrudes from the work space back surface 8 a. The television monitor rear surface 19a has a vent hole for taking air into the television monitor in order to cool the heat generated during operation of the electronic component. The television monitor back surface 19a is disposed in the television monitor back surface duct 23 in order to take air into the vent. Naturally, the air flowing through the circulation flow path 7 flows in the television monitor rear duct 23. However, there is a possibility that the air flowing through the circulation channel contains the bacteria / viruses 15 tested in the work section 3. The TV monitor back duct 23 is provided with an inflow side TV monitor back duct opening / closing door 24a and an outflow side TV monitor back duct opening / closing door 24b. When the safety cabinet 1 and the TV monitor 19 are used, the inflow side TV monitor rear duct opening / closing door 24a and the outflow side TV monitor rear duct opening / closing door 24b are opened for the purpose of cooling the electronic components of the TV monitor 19. In this state, air is taken into the television monitor back surface 19a.

  FIG. 3 is a cross-sectional structure diagram showing the safety cabinet showing the first embodiment of the present invention.

  FIG. 3 shows a state in which the inflow side TV monitor rear duct opening / closing door 24a and the outflow side TV monitor rear duct opening / closing door 24b are closed with respect to FIG. When exchanging the HEPA filter 4 for exhaust and the HEPA filter 5 for supply air, the bacteria / viruses 15 are killed in advance in the safety cabinet 1 in order to prevent infection with the bacteria / viruses 15 at the time of replacement and after the replacement. Gas may be generated. Since the gas may deteriorate electronic components such as the television monitor 19, the inflow side television monitor rear duct opening / closing door 24a and the outflow side television monitor rear duct opening / closing door 24b are closed as shown in FIG. Gas that kills the bacteria / viruses 15 is prevented from entering the monitor 19. By closing this door, the electronic components in the television monitor 19 are protected. After completion of the killing work by the bacteria / virus 15 gas, the inflow side TV monitor rear duct opening / closing door 24a and the outflow side TV monitor rear duct opening / closing door 24b are opened, and air is again applied to the electronic components in the TV monitor, It will be cooled. At the time of the killing work due to the gas of bacteria / virus 15, the opening / closing door 24 a for the inflow TV monitor rear duct and the opening / closing door 24 b for the outflow TV monitor rear duct are closed. 15 may not have been killed, but the exhausted HEPA filter 4 and the HEPA for supplying air even if the bacteria / virus 15 that has operated the safety cabinet 1 again scattered from inside the TV monitor 19. Since it is removed by the filter 5, there is no influence on the experiment in the work space 3.

  The opening / closing door 24a for the inflow side TV monitor rear duct and the opening / closing door 24b for the outflow side TV monitor rear duct include a method using a fluid electromagnetic valve and a method using an electric opening / closing damper.

  FIG. 4 is a cross-sectional structure diagram showing a safety cabinet showing a second embodiment of the present invention.

  The airflow of the air barrier 11 is sucked from the front suction slit 16, passes through the circulation flow path 7, and is finally discharged from the exhaust HEPA filter 4. Therefore, the dust in the outside air and the bacteria / viruses 15 handled in the safety cabinet are repaired by the exhaust HEPA filter 4. As a result, the exhaust HEPA filter 4 is clogged. Since the performance of the blower 6 is limited, when the exhaust HEPA filter 4 is clogged, the air volume of the exhaust air 21 decreases. Since the amount of air exhausted from the safety cabinet 1 is the amount of air sucked into the safety cabinet, there is a possibility that the inflow air speed 13a will drop, the air barrier 11 will collapse, and the bacteria / viruses 15 in the work space 3 will come out. Will come out.

  In order to monitor the state of the air barrier 11, in the second embodiment, an exhaust port wind speed sensor 20 a is provided on the leeward side of the exhaust HEPA filter 4 to monitor a change in exhaust air volume = inflow air volume. By displaying the degree of wind speed reduction (not shown), it is possible to determine whether the safety cabinet 1 can be used safely.

  Further, a work room wind speed sensor 20 b is provided on the leeward side of the air supply HEPA filter 5 in the work space 3. This is installed for the purpose of monitoring whether the air supply HEPA filter 5 is clogged with dust and the wind speed of the blown air 12 that is clean air supplied to the work space 3 is reduced. With these two wind speed sensors, it is possible to monitor the clogging of the exhaust HEPA filter 4 and the supply HEPA filter 5. Further, it is possible to control the air blowing performance of the blower 6 according to the wind speed sensor output.

  However, since the exhaust wind speed sensor 20a and the work room wind speed sensor 20b are both in the safety cabinet 1, they are exposed to an atmosphere of gas that kills the bacteria / viruses 15 such as during filter replacement.

  FIG. 5 is a detailed external view of a wind speed sensor showing a second embodiment of the present invention.

  The wind speed sensor also uses electronic components. Therefore, exposure to a gas that kills the bacteria / virus 15 may cause changes in characteristics or damage. The wind speed sensor 20 has a wind speed sensor air intake 25a and a wind speed sensor air outlet 25b (not shown). Normally, air is taken in from the wind speed sensor air intake 25a, the speed of the flow is determined in the wind speed sensor 20, and air is discharged from the wind speed sensor air outlet 25b. In the second embodiment, a wind speed sensor cover 26 is provided in the vicinity of the wind speed sensor 20. The wind speed sensor cover 26 is provided with a cover packing 26a. When the safety cabinet 1 is used, as shown in FIG. 5A, air can enter and exit from the wind speed sensor air intake 25a and the wind speed sensor air outlet 25b.

  When generating gas that kills the bacteria / viruses 15 in the safety cabinet 1, it is necessary to protect the wind speed sensor 20 by closing the wind speed sensor air intake 25a and the wind speed sensor air outlet 25b. At that time, as shown in FIG. 5 (b), the wind speed sensor cover 26 is rotated, and finally, as shown in FIG. 5 (c), the cover portion packing 26a is connected to the wind speed sensor air intake port 25a and the wind speed. The sensor air outlet 25b is closed.

  When the gas that kills the bacteria / virus 15 is generated, the shape temporarily becomes as shown in FIG. 5C, and the wind speed sensor 20 is protected. After completion of the work for killing the bacteria / viruses 15, the state of FIG. 5A is restored again, and the state of the wind speed in the safety cabinet 1 is monitored.

  There are two methods for opening and closing the wind speed sensor cover 26: manually opening and closing the wind speed sensor cover 26 and electrically opening and closing the wind speed sensor cover 26.

  FIG. 6 shows a wind speed sensor protection method according to the third embodiment of the present invention.

  Some wind speed sensors 20 have a structure in which the sensor portion is exposed. In this case, the sensor unit can be protected by storing the wind speed sensor 20 in the wind speed sensor case 27. The wind speed sensor case 27 is provided with a wind speed sensor case air inlet 27a and a wind speed sensor case air outlet 27b (not shown). The air that has entered from the wind speed sensor case air intake 27a is sensed by the internal wind speed sensor 20, and is discharged from the wind speed sensor case air outlet 27b.

  FIG. 7 is an external view of a wind speed sensor mounting structure showing a third embodiment of the present invention.

  A wind speed sensor cover 26 is provided in the vicinity of the wind speed sensor case 27 containing the wind speed sensor 20. The wind speed sensor cover 26 is provided with a cover packing 26a. Normally, when the safety cabinet 1 is used, as shown in FIG. 7A, air can enter and exit from the sensor case air inlet 27a and the sensor case air outlet 27b.

  When generating gas that kills the bacteria / virus 15 in the safety cabinet 1, the sensor case air intake 27a and the sensor case air outlet 27b are closed to protect the internal wind speed sensor 20. At that time, the wind speed sensor cover 26 rotates as shown in FIG. 7B, and finally, as shown in FIG. 7C, the cover portion packing 26a is connected to the sensor case air intake 27a and the sensor. The case air outlet 27b is closed.

  When the gas that kills the bacteria / virus 15 is generated, the shape temporarily becomes as shown in FIG. 7C, and the wind speed sensor 20 is protected. After completion of the work for killing the bacteria / viruses 15, the state of FIG. 7A is restored again, and the state of the wind speed in the safety cabinet 1 is monitored.

  FIG. 8 is a wind speed sensor protection structure diagram showing a fourth embodiment of the present invention.

  A wind speed sensor housing portion 28 is provided in a wind speed sensor 20 mounting portion such as the work space side wall surface 8. A wind speed sensor unit packing 29 is provided at the tip of the wind speed sensor 20 installed so as to protrude from the wind speed sensor storage unit 28.

  When the safety cabinet 1 is used, the wind speed in the safety cabinet 1 is sensed in such a manner that the wind speed sensor jumps out of the wind speed sensor storage section 28 as shown in FIG.

  When it is necessary to fill the safety cabinet 1 with a gas that kills the bacteria / virus 15, the wind speed sensor 20 is housed in the wind speed sensor housing section 28 as shown in FIG. At this time, the wind speed sensor portion packing 29 and the wind speed sensor storage portion 28 have a sealed structure, so that the internal wind speed sensor 20 is protected.

  When the safety cabinet is used again, the state shown in FIG. 8A is restored and the wind speed in the safety cabinet 1 is monitored.

  The method for changing from the state of FIG. 8A to the state of FIG. 8B includes a manual method and an electric method.

  The present invention kills pathogens attached to the HEPA filter inside the safety cabinet with gas without damaging the electronic equipment even if IT field equipment such as electronic equipment is introduced into the safety cabinet that handles biological materials and pathogens. Provide a safety cabinet for biohazard countermeasures.

It is a block diagram which shows the safety cabinet which shows 1st, 2nd, 3rd, 4th embodiment of this invention. It is a section construction figure showing the safety cabinet which shows a 1st embodiment of the present invention. It is a section construction figure showing the safety cabinet which shows a 1st embodiment of the present invention. It is sectional structure drawing which shows the safety cabinet which shows 2nd Embodiment of this invention. It is a wind speed sensor external appearance detailed drawing which shows 2nd Embodiment of this invention. It is a wind speed sensor protection method which shows 3rd Embodiment of this invention. It is a wind speed sensor attachment structure external view which shows 3rd Embodiment of this invention. It is a wind speed sensor protection structure figure which shows 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Safety cabinet 1a ... Main body case 2 ... Work table 3 ... Work space 4 ... Exhaust HEPA filter 5 ... Supply HEPA filter 6 ... Blower 7 ... Circulating flow path 8 ... Work space side wall surface 8a ... Work space back surface 9 ... Front shutter 10 ... Front opening 10a ... Front opening size 11 ... Air barrier 12 ... Blowing air flow 12a ... Blowing air velocity 13 ... Incoming air flow 13a ... Incoming air velocity 14 ... Negative pressure plenum 15 ... Bacteria / virus 16 ... Front suction slit 17 ... Back air suction port 18 ... · Pressure chamber 19 ··· TV monitor 19a ··· TV monitor rear surface 20 ··· Wind speed sensor 20a ··· Exhaust port air velocity sensor 20b · · · Indoor air velocity sensor 21 · · · Exhaust air 22 · · · Exhaust port 23 ... TV monitor rear duct 24a ... Inflow side TV monitor rear duct opening / closing door 24b ... Outflow side TV monitor rear duct opening / closing door 25a ... Wind speed sensor air intake 25b ... Wind speed sensor air outlet 26 ... Wind speed sensor cover 26a ... Cover part packing 27 ... Wind speed sensor case 27a ... Sensor case air inlet 27b ... Sensor case air outlet 28 ... Wind speed sensor storage part 29 ... Wind sensor packing

Claims (1)

An air supply system for supplying clean air to the work space through the first air cleaning means by the blower means; a front shutter formed on the front surface of the work space; a front opening connected to the work space below the front shutter; An exhaust system that sucks air from the front opening and discharges the air to the outside of the apparatus through the second air cleaning means, and a pressure chamber connected to the first and second air cleaning means and the air blowing means. In the safety cabinet,
A safety cabinet characterized in that a part is arranged in a work space or a part of an exhaust system through which air flows, another flow path is provided so as to surround the part, and a sealable door is provided at the air inlet / outlet.

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