JPH0112832Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an exhaust sterilization device for biohazard prevention facilities, and particularly to an exhaust sterilization device that sterilizes and sterilizes with a high-performance filter (HEPA filter).

A system diagram of a conventional device is shown in FIGS. 1 and 2. In the device shown in Figure 1, exhaust gas from the room is passed through an exhaust duct 1 and an airtight damper 2, and then HEPA
Bacteria are removed by a HEPA filter 4 installed in the filter unit 3, and the air is exhausted by an exhaust fan 5 via an exhaust duct 1 and an airtight damper 2. One exhaust fan 5 is provided as a spare.

When replacing the HEPA filter 4, formalin gas is introduced from the formalin gas generator 6 through the introduction pipe 7 to the steam ejector 8, and then through the injection valve 9.
Inject into the HEPA filter unit 3 to sterilize the HEPA filter 4.

However, in such a configuration, HEPA
A drain valve 10 is required in the filter unit 3, and a device for sterilizing the drain valve 10 is also required.

In the device shown in FIG. 2, a formalin gas injection valve 9 is provided in the exhaust duct 1 on the primary side of the HEPA filter 4 to inject formalin gas, but the formalin gas is evenly distributed over the entire surface of the HEPA filter 4. It takes a long time to sterilize the entire surface, and the reliability of complete sterilization on the entire surface is unreliable.

The purpose of this invention is to eliminate the drawbacks of the prior art and provide an exhaust sterilization device for a biohazard facility that can perform the sterilization work when replacing the HEPA filter 4 in a short time and reliably sterilize it.

This idea involves preparing two HEPA filter units, and attaching a connecting valve between both HEPA filter units so that when one HEPA filter is sterilized, the other HEPA filter can collect the sterilizing gas. , also sterile gas
It is constructed with a bypass valve attached so that it can be injected into the primary and secondary sides of the HEPA filter at the same time.

FIG. 3 shows a system diagram of an embodiment of the exhaust sterilization device for a biohazard prevention facility according to this invention.

Exhaust duct 1A branches off exhaust gas from the room that is maintained at negative pressure for 24 hours via exhaust duct 1,
1B, airtight dampers 2A and 2B, HEPA filter units 3A and 3B arranged in parallel, airtight dampers 2A and 2B, and exhaust fan 5. Sterilization is performed using A and B series alternately. HEPA filter unit 3A and 3
A connecting valve 11 is attached to a pipe 10 that connects between Primary side and 2 of HEPA filter 4A, 4B
The next side is connected by bypass piping 12A, 12B, and bypass valves 13A, 13B are attached in the middle. Fresh air inlets 14A, 14B and valves 15A, 1 are provided on the secondary side of HEPA filters 4A, 4B.
Add 5B. Formalin gas injection valves 9A and 9B are attached to the secondary side of the HEPA filters 4A and 4B.

Next, the operating method when replacing the HEPA filter 4A will be explained.

Close the airtight damper 2A and the connecting valve 11, open the bypass valve 13A, and close the formalin gas injection valve 9.
A is opened and formalin gas is injected to sterilize the HEPA filter 4A after a certain period of time has elapsed. The evacuated room is continuously evacuated 24 hours a day to maintain negative pressure. During this time, the air in the room is exhausted through the HEPA filter unit 4B.

Next, when the airtight damper 2A and the bypass valve 13A are closed and the connecting valve 11 and the fresh air blowing valve 15A are opened, the exhaust fan 5 sucks fresh air.
Since the primary side of HEPA filter 4A is reached and the primary side of HEPA filter 4B is negative pressure,
The sterilizing gas from the secondary side of the HEPA filter 4A enters the primary side of the HEPA filter 4B, and the exhaust fan 5
Exhausted by.

When the exhaust is finished, close the connecting valve 11 and replace the HEPA filter 4A.

This idea was developed by installing multiple HEPA filter units in parallel in an exhaust sterilization system for biohazard prevention facilities equipped with HEPA filters and exhaust fans, and connecting the primary sides of each HEPA filter with piping. Because I added a valve,
Displace the sterile gas in the HEPA filter unit with other
Exhaust air passes through a HEPA filter unit, so
The collection is complete and a safe and reliable sterilization effect can be obtained.

In addition, since the primary and secondary sides of each HEPA filter are connected by bypass piping and a bypass valve is attached, formalin gas fills the primary and secondary sides of the HEPA filter at the same time, which reduces the sterilization time. can be shortened.

[Brief explanation of the drawing]

1 and 2 are system diagrams of a conventional device, and FIG. 3 is a system diagram of an embodiment of the exhaust sterilization device for a biohazard countermeasure facility according to this invention. 1, 1A, 1B...Exhaust duct, 2, 2A, 2
B...Airtight damper, 3, 3A, 3B...HEPA
Filter unit, 4, 4A, 4B...HEPA
Filter, 5... Exhaust fan, 6... Formalin gas generator, 8... Steam ejector, 9, 9A, 9
B...Formalin gas injection valve, 10...Piping, 1
1...Connection valve, 12A, 12B...Bypass piping, 13A, 13B...Bypass valve, 14A, 1
4B...Fresh air intake port.

Claims (1)

[Scope of utility model registration request] In the exhaust sterilization equipment of biohazard prevention facilities equipped with HEPA filters and exhaust fans,
Install multiple HEPA filter units in parallel, connect the primary side of each HEPA filter with piping, and attach a connecting valve.
A biohazard countermeasure facility exhaust sterilizer characterized in that a next side and a secondary side are connected by bypass piping and a bypass valve is attached.