JP2022029130A - Disinfection system - Google Patents

Abstract

To provide a disinfection system which can sure safety when a person enters a room while sufficiently disinfecting the room.SOLUTION: A disinfection system for disinfecting a room by disinfection gas includes: a generation part for generating disinfection gas, and emitting the disinfection gas into the room; a removal part for circulating air in the room and removing the disinfection gas; a sensor part for detecting concentration of the disinfection gas in the room; a detection part for detecting a stop condition that is a cause of stopping the generation part; and a control part for stopping the generation part on the basis of the stop condition detected by the detection part when the generation part is operated, controlling the removal part, and adjusting concentration of the disinfection gas remaining in the room detected by the sensor part to be a reference or lower.SELECTED DRAWING: Figure 1

Description

The present invention relates to a disinfection system for disinfecting a room.

Infectious diseases caused by the new coronavirus are spreading worldwide. Frequent indoor disinfection work is required to remove the virus that causes infection in the room. However, the method of cleaning the room with a disinfectant requires time and effort, and there is a risk that unwiped residue may occur.

As a method of disinfecting the contact surface of the entire room, a technique related to ozone fumigation in which ozone gas is released into the room and the room is exposed to ozone gas is known (see, for example, Patent Document 1 and Patent Document 2). In connection with this, for example, Patent Document 3 describes a technique for adjusting the ozone concentration in a room by calculating a CT value which is a value that can be estimated for ozone disinfection in the room. After ozone fumigation, the ozone concentration in the room is high, and a long decomposition time is required until the ozone concentration is such that a person can enter the room.

A technique for adjusting the ozone concentration at a low concentration so as not to affect the human body has been proposed (see, for example, Patent Document 4). However, a sufficient disinfecting effect may not be obtained at a concentration that does not affect the human body. When the room is in a manned environment, ozone fumigation may be applied at a low concentration of 0.1 ppm, but the disinfection effect is reduced with low concentration ozone, and there is a risk of health damage if used for a long time. Further, according to the above-mentioned technique, if the room is entered during disinfection, it is not assumed and it cannot be said that the safety is sufficiently ensured.

Japanese Unexamined Patent Publication No. 2011-019825 Japanese Unexamined Patent Publication No. 2019-162046 Japanese Unexamined Patent Publication No. 2012-07511 Japanese Unexamined Patent Publication No. 2019-187653 Special Table 2012-531979 Publication No.

According to the proposed method, it takes time to decompose ozone after disinfection, so it is necessary to keep the environment unmanned for a long time until the ozone concentration in the room decreases. In addition, when it was necessary to enter the room in an environment where the ozone gas in the room was high, it was necessary for a person to open the window and ventilate the room. Patent Document 5 describes a technique for removing ozone by using an apparatus that performs ozone treatment after fumigating ozone with a portable ozone generator. However, even in this technique, there is no proposal for ensuring safety when a person enters the room during disinfection.

An object of the present invention is to provide a disinfection system capable of ensuring safety when a person enters a room while performing sufficient disinfection.

In order to achieve the above object, the present invention is a disinfection system for disinfecting a room with a disinfectant gas, in which the disinfectant gas is circulated between the generating part that generates the disinfectant gas and releases it into the room and the air in the room. The removal unit to be removed, the sensor unit that detects the concentration of the disinfectant gas in the room, the detection unit that detects the stop condition that is a factor for stopping the generation unit, and the generation unit when the generation unit is in operation, said. Based on the stop condition detected by the detection unit, the generation unit is stopped and the removal unit is controlled to adjust the concentration of the disinfectant gas remaining in the room detected by the sensor unit to be below the standard. It is a disinfection system characterized by being provided with a control unit.

According to the present invention, the room is sufficiently disinfected with disinfectant gas in the generating part, and after disinfection, the removing part quickly removes the disinfecting gas to a safe concentration to ensure safety when a person enters the room. Can be secured.

Further, when the stop condition is not detected, the control unit of the present invention operates the generation unit so that the concentration of the disinfectant gas in the room is maintained within a predetermined range for a predetermined operation time. It may be configured as follows.

According to the present invention, since the control unit controls the generating unit so as to keep the disinfecting gas at a sufficient concentration, the room can be reliably disinfected.

Further, the stop condition of the present invention may include at least one of the factors of the lapse of a predetermined operating time, the approach of a person, the opening of a door, and the operation for stopping.

According to the present invention, when a stop condition such as a person entering or approaching a room after disinfection is detected, the removal unit is operated to reduce the ozone concentration in the room, so that safety can be ensured.

Further, the generating part and the removing part of the present invention may partition adjacent rooms and may be provided in a wall facing the room and shared in the adjacent room.

According to the present invention, by providing the generating portion and the removing portion in the wall, the installation cost of the disinfection system can be reduced by sharing the generating portion and the removing portion with another room.

Further, the generating part and the removing part of the present invention may be provided in the air conditioner for adjusting the temperature in the room.

According to the present invention, the installation cost of the disinfection system can be reduced by providing the generating part and the removing part in the air conditioner.

Further, the removing portion of the present invention may be configured to have a chemical filter for removing the disinfecting gas.

According to the present invention, a low concentration of disinfectant gas can be efficiently removed by using a chemical filter.

According to the present invention, it is possible to ensure safety when a person enters the room while performing sufficient disinfection.

It is a block diagram which shows the structure of the disinfection system which concerns on embodiment of this invention. It is a figure which shows the structure of the room which is the object of disinfection. It is a figure which shows the other composition of the room which is the object of disinfection. It is a figure which shows the arrangement relation of the disinfection system in a room. It is a figure which shows the other arrangement relation of the disinfection system in a room. It is a figure which shows the time-dependent change of ozone concentration after disinfection. It is a figure which shows the time-dependent change of the ozone concentration when the removal part was operated after disinfection. A flow chart showing the flow of processing performed in a disinfection system.

Hereinafter, embodiments of the disinfection system according to the present invention will be described with reference to the drawings. The disinfection system disinfects the room with ozone gas. The disinfection system is applied to places requiring disinfection, such as virus-infected person use rooms, break rooms, toilets, and private rooms of restaurants. The disinfection system can be applied to a room or a space partitioned by a door, an air curtain, or the like, where it can be left unattended for a certain period of time (for example, 30 minutes or more, preferably less time).

As shown in FIG. 1, the disinfection system 1 is a factor for stopping the generation unit 2 that generates ozone gas, the removal unit 10 that removes ozone gas, the sensor unit 20 that detects the concentration of ozone gas, and the generation unit. It includes a detection unit 30 for detecting a stop condition, a control unit 40 for controlling the generation unit 2 and the removal unit 10, and a storage unit 50 for storing data related to control.

The generation unit 2 is mounted in the ceiling of the room, for example. The generation unit 2 may be provided in an air conditioner that adjusts the temperature in the room. The generation unit 2 may be a portable device. The generation unit 2 generates disinfectant gas. The generator 2 includes, for example, an ozone generator that generates ozone gas. The ozone generator has, for example, a parallel electrode and a dielectric provided between the electrodes. Oxygen gas, dry air, etc. are supplied between the electrodes, and when an AC high voltage is applied between the electrodes, a discharge is generated from the dielectric and ozone is generated from oxygen. The generation unit 2 circulates the indoor air sucked from the intake port to the generator, and discharges the generated ozone-containing air into the room from the air outlet.

The removing portion 10 is mounted in the ceiling of the room, for example. The removing unit 10 may be provided in an air conditioner that adjusts the temperature in the room. The removing unit 10 may be a portable device. The removing unit 10 includes a chemical filter that decomposes and removes chemical substances such as ozone gas. Depending on the concentration of ozone gas, a decomposition catalyst such as manganese dioxide may also be used in combination.

Chemical filters have applications in equipment such as clean rooms and semiconductor manufacturing equipment, and can remove ozone gas with high efficiency even at extremely low concentrations. The removing unit 10 sucks the air in the room from the intake port, passes it through a chemical filter, blows the air after removing the ozone gas into the room from the air blowing port, and circulates it. By providing the generating part and the removing part in the air conditioner, the installation cost of the disinfection system 1 can be reduced.

The sensor unit 20 includes a plurality of sensors installed at a plurality of locations in the room. The plurality of sensors are installed at a position of 50 cm or more, which is touched by many people. The sensor has a detection limit of 0.01 ppm and detects ozone gas having a concentration of 0.01 ppm or more.

The detection unit 30 detects a stop condition including at least one of each factor of, for example, the passage of a predetermined operating time, the approach of a person, the opening of a door, and the operation for stopping. The detection unit 30 includes a timer, a motion sensor, a door lock open / close sensor, and an operation panel. The detection unit 30 detects the operating time of the generation unit 2 by a timer. The detection unit 30 detects a human detection signal by the motion sensor. The motion sensor is provided indoors or in a corridor leading to the room. The motion sensor detects the entry of a person or the approach to the room. The motion sensor may detect the user's position by communicating with the user's mobile terminal using a wireless device such as Bluetooth (registered trademark).

The detection unit 30 detects the detection signal of the open / close sensor for the lock of the door of the room. The open / close sensor detects the open / closed state of the room door. The detection unit 30 detects the control signal of the stop button on the operation panel.

The storage unit 50 stores data such as a control program and ozone concentration setting conditions. The storage unit 50 is a storage medium such as an HDD or a flash memory. The storage unit 50 may be connected via a network.

The control unit 40 controls the generation unit 2 and the removal unit 10 based on the detection results of the sensor unit 20 and the detection unit 30. The control unit 40 may be connected via a network. The control unit 40 and the storage unit 50 may be realized by a terminal device such as a personal computer, a tablet terminal, or a smartphone. These terminal devices may be remotely controlled via a network.

The control unit 40 is generated when, for example, the presence of a person in the room is not confirmed and the door of the room is closed based on the detection results of the motion sensor of the detection unit 30 and the door lock open / close sensor. Unit 2 is operated to release ozone gas into the room. The control unit 40 adjusts the generation unit 2 based on the detection result of the sensor unit 20 so that the concentration of ozone gas in the room becomes within a predetermined range.

The control unit 40 adjusts, for example, the ozone concentration to a minimum of 1 ppm and an effective concentration of 1-10 ppm. The control unit 40 may adjust the ozone concentration to 10 ppm or more if it can be controlled. The control unit 40 operates the generation unit 2 for a predetermined time. When no one is present in the room and the stop condition is not detected, the control unit 40 operates the generation unit 2 so that the concentration of ozone gas in the room is maintained within a predetermined range for a predetermined operation time.

The control unit 40 may operate the generation unit 2 when the timer of the detection unit 30 is in a preset time zone such as at night. When the timer of the detection unit 30 reaches a predetermined operation time or more from the start of operation of the generation unit 2, the control unit 40 stops the generation unit 2 and controls the removal unit 10. As a result, the disinfection system 1 can efficiently reduce the risk of infection by automatically disinfecting when there is no person in the room.

When a stop condition such as a person entering the room, an approach of a person to the room, an open state of the room door, or an operation of the stop button on the operation panel is detected while the generator 2 is in operation, ozone in the room is detected. It is necessary to reduce the concentration. The control unit 40 stops the generation unit 2 based on the stop condition detected by the detection unit 30 while the generation unit 2 is in operation, and controls the removal unit 10 to remain in the room detected by the sensor unit 20. Adjust the concentration of ozone gas to below the standard. Thereby, the disinfection system 1 can ensure the safety of the room after disinfection.

The control unit 40 controls the removal unit 10 to adjust the ozone concentration to less than 0.051 ppm, which is an evaluation item of WELL certification. When there is a person at high risk of asthma or allergy, the control unit 40 controls the removal unit 10 to adjust the ozone concentration to 0.01 ppm or less, which is the sensor detection limit. The control unit 40 may be interlocked with the air conditioner at the time of ozone removal, and may also perform ventilation by exhausting outside air.

Next, a specific configuration of the disinfection system 1 will be described.

As shown in FIG. 2, a generating unit 2 and a removing unit 10 are provided in the room R. A sensor unit 20 for detecting the ozone concentration is provided in the room R. Room R is provided with a door T that can be opened and closed for people to enter and exit. The door T is closed while the generating unit 2 is in operation. A corridor K leading to the door T is provided outside the room R. The operation panel S of the disinfection system 1 is provided in the corridor K. The user can operate or stop the disinfection system 1 by using the operation panel S. The operation panel S may be provided in the room as well.

As shown in FIG. 3, a detection unit 30 (presence sensor) may be provided in the room R and in the corridor K. The motion sensor is provided in the corridor K at a predetermined distance from the door T. The motion sensor detects that a person has approached the room R in the corridor K.

As shown in FIG. 4, a generation unit 2 is provided in the ceiling of each of the plurality of rooms R. The removing portion 10 is provided in the ceiling. The removing unit 10 may be shared to remove ozone gas in a plurality of rooms R. The removing portion 10 is provided in a wall B in which an intake pipe 11 partitions each room R. The intake port 12 is formed by opening to each room R at the lower part of the wall B.

In the removing unit 10, the blower pipe 13 is branched and connected to those rooms R. The air outlet 14 is formed by opening in the ceiling of each room R. The control unit 40 selects one of the rooms R, controls the generation unit 2 and the removal unit 10, and performs disinfection treatment. With the above configuration, since the removal unit 10 is shared in each room R, the installation cost of the disinfection system 1 can be reduced.

As shown in FIG. 5, the generating unit 2 and the removing unit 10 may be provided in the wall B facing the room that partitions the plurality of rooms R. The removing portion 10 is provided below the generating portion 2. The intake pipe 11 is provided in a wall B that partitions each adjacent room R. The intake port 12 is formed by opening to each room R at the lower part of the wall B. The blower pipe 13 is connected to the generation unit 2. The air outlet 3 of the generation unit 2 is formed so as to open in each room R. The control unit 40 selects one of the rooms R, controls the generation unit 2 and the removal unit 10, and performs disinfection treatment. With the above configuration, since the removal unit 10 is shared in each room R, the installation cost of the disinfection system 1 can be reduced.

FIG. 6 shows the ozone concentration and the CT value in the room R after the generation unit 2 is operated. The CT value is generally an index value indicating the effect of disinfection when sterilizing with ozone, and is the product of the ozone concentration (ppm) and the sterility time (minutes). The higher the CT value, the higher the disinfection effect. When the removing unit 10 is not operated, it takes 3-4 hours for the ozone concentration to drop to the reference value (0.1 ppm) of the room-accessible concentration after stopping the generating unit 2.

FIG. 7 shows the ozone concentration and the CT value in the room R when the removing unit 10 is operated after the generating unit 2 is operated. When the removal unit 10 is operated after the generation unit 2 is stopped, the time required for the ozone concentration to drop to the reference value (0.1 ppm) of the room-accessible concentration is 5 to 30 minutes, which is significantly shortened.

The control unit 40 may display information indicating disinfection on a display unit (not shown) provided outside the room while the generation unit 2 is in operation. The control unit 40 may close the door lock while the generation unit 2 is in operation. When the door lock is closed, the control unit 40 controls the removal unit 10 after detecting that the stop button on the operation panel has been operated, and the concentration of ozone gas remaining in the room detected by the sensor unit 20. After adjusting to below the standard, the door lock may be opened.

Next, the processing of the disinfection method in the room R by the disinfection system 1 will be described.

FIG. 8 shows the flow of processing executed in the disinfection system 1. Occurrence when the control unit 40 determines based on the detection result of the detection unit 30 that there is no person in or near the room R and the start condition is that the door T is closed (step S10). Part 2 is operated and ozone fumigation is started (step S12).

The control unit 40 maintains the ozone concentration in the room R within the reference range based on the detection result of the sensor unit 20. When the control unit 40 determines that the stop condition is determined based on the detection result of the detection unit 30, the control unit 40 stops the generation unit 2 and stops ozone fumigation (step S16). The control unit 40 operates the removal unit 10 and removes ozone until the ozone concentration in the room R becomes equal to or less than the reference value based on the detection result of the sensor unit 20 (step S18).

As described above, according to the disinfection system 1, even after disinfecting the room, the removal unit 10 can be operated to enter the room in a short time. According to the disinfection system 1, when a person enters or approaches a room during disinfection, the removal unit 10 is operated to reduce the ozone concentration in the room in a short time, thereby improving safety. According to the disinfection system 1, it can be used in a high-operation facility that needs to accept an infectious disease patient at an early stage after disinfection, and a facility with many infected persons and an unspecified number of users.

According to the disinfection system 1, when the user and the resident are replaced, the risk of infection can be reduced by disinfecting the target room by using the unmanned time zone. According to the disinfection system 1, since the room is exposed to ozone having a predetermined concentration, the risk of infection of the disinfectant who cleans and disinfects the room can be reduced.

The control unit 40 described above is realized by, for example, a hardware processor such as a CPU (Central Processing Unit) executing a program (software). Some or all of these components are hardware (circuit parts) such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), GPU (Graphics Processing Unit). It may be realized by (including circuits), or it may be realized by the cooperation of software and hardware.

The program may be stored in advance in a storage device such as an HDD (Hard Disk Drive) or a flash memory, or may be stored in a removable storage medium such as a DVD or a CD-ROM, and the storage medium is stored in the drive device. It may be installed by being attached. Further, this computer program may be distributed to a computer via a communication line, and the computer receiving the distribution may execute the program.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned one embodiment and can be appropriately modified without departing from the spirit of the present invention. For example, the disinfection system 1 may be applied not only to remove ozone but also to remove disinfectant gas containing other chemical substances such as hydrogen peroxide, peracetic acid, hypochlorous acid and the like.

1 Disinfection system 2 Generation part 3 Blower 10 Removal part 11 Intake pipe 12 Intake port 13 Blower pipe 14 Blower 20 Sensor part 30 Detection part 40 Control part 50 Storage part B Wall K Corridor R Room S Operation panel T Door

Claims (6)

It is a disinfection system that disinfects the room with disinfectant gas.
The generation part that generates the disinfectant gas and releases it into the room,
A removal unit that circulates the air in the room and removes the disinfectant gas,
A sensor unit that detects the concentration of the disinfectant gas in the room, and
A detection unit that detects a stop condition that is a factor that causes the generation unit to stop, and a detection unit.
When the generation unit is operating, the generation unit is stopped based on the stop condition detected by the detection unit, and the removal unit is controlled to remain in the room detected by the sensor unit. It is characterized by comprising a control unit for adjusting the concentration of the disinfectant gas to be below the standard.
Disinfection system. When the stop condition is not detected, the control unit operates the generation unit so that the concentration of the disinfectant gas in the room is maintained within a predetermined range for a predetermined operation time.
The disinfection system according to claim 1. The stop condition includes at least one of the factors of the elapse of a predetermined operating time, the approach of a person, the opening of a door, and the operation for stopping.
The disinfection system according to claim 1 or 2. The generating part and the removing part are divided into adjacent rooms and are provided in a wall facing the room and shared in the adjacent room.
The disinfection system according to any one of claims 1 to 3. The generating part and the removing part are provided in the air conditioner for adjusting the temperature in the room.
The disinfection system according to any one of claims 1 to 3. The removing portion has a chemical filter that removes the disinfecting gas.
The disinfection system according to any one of claims 1 to 5.

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