JP7448920B2 - Ozone sterilizer - Google Patents

Description

The present invention relates to an ozone sterilizer.

Conventionally, in order to prevent secondary infection during emergency transportation and treatment of people infected with viruses, etc., protective clothing worn by emergency personnel, white coats worn by doctors at hospitals, etc., and reusable clothing have been used. Techniques have been proposed for sterilizing therapeutic instruments and the like using ozone.

Regarding this, Patent Document 1 discloses that ozone gas is supplied to an airtight disinfection chamber into which returning emergency personnel enter, and a CT value, which is the product of the emergency personnel's stay time and the ozone concentration inside the disinfection chamber, is calculated. It describes a disinfection device for returning emergency personnel that notifies the emergency personnel that the amount has reached a predetermined value.
Furthermore, Patent Document 2 discloses that when the start of sterilization treatment is detected, the actually measured CT value is reset, and the product of the ozone concentration and the sampling interval time (or the actual interval time) is added to the actually measured CT value. An ozone sterilization management device is described that terminates the sterilization process when the CT value becomes equal to or higher than the judgment CT value for determining the end of the sterilization process.
In addition, Patent Document 3 discloses that the calculated CT value is divided into multiple stages from 0% to 100% of the CT setting value, and an indicator light is lit, and a reset button and a down button to decrease the CT setting value are pressed at the same time. An ozone sterilization management device is described that sets the CT set value to 0 when the CT setting value is 0.

Patent No. 4762331 Patent No. 5124536 Patent No. 5538037

By the way, with conventional ozone sterilizers, if the power supply to the ozone sterilizer is suddenly cut off due to a power outage or the user accidentally unplugging the power outlet during operation, the RAM area of the control unit Since the work data inside is deleted, the CT value [ppm·min] is reset.
In this case, there is a problem in that when the power supply to the ozone sterilization apparatus is restarted, it is not possible to perform an operation that takes into account the CT value before the power supply is cut off.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an ozone sterilization device that can more effectively perform sterilization using ozone.

In order to solve the above problem, an ozone sterilization device according to the invention according to claim 1,
an ozone generating section that generates ozone gas;
an ozone concentration measuring section that measures ozone concentration in the air;
a time measuring unit that measures the elapsed time after the ozone generating unit starts generating ozone gas;
a calculation unit that calculates a CT value based on the ozone concentration measured by the ozone concentration measurement unit and the elapsed time measured by the time measurement unit;
a storage unit that stores the ozone concentration and/or the CT value in a nonvolatile storage unit;
An ozone sterilization device comprising:
When the power supply is restarted after the power supply to the ozone sterilization apparatus is cut off, the calculation unit calculates the CT value after the power supply is restarted based on the ozone concentration or the CT value stored in the nonvolatile storage unit. Calculate the value.

Further, the invention according to claim 2 provides the ozone sterilization apparatus according to claim 1,
The calculation unit is configured to determine whether the difference between the current time and the last storage time at which the ozone concentration and/or the CT value was stored by the storage unit before the power supply to the ozone sterilizer was cut off is within a predetermined threshold. In this case, the CT value after power supply is restarted is calculated based on the ozone concentration or the CT value stored in the nonvolatile storage unit.

Further, the invention according to claim 3 provides the ozone sterilization apparatus according to claim 2,
The predetermined threshold value is one minute.

Further, the invention according to claim 4 provides the ozone sterilization apparatus according to any one of claims 1 to 3 ,
The storage unit stores the ozone concentration and/or the CT value in the non-volatile storage unit at time intervals of minutes.

Further, the invention according to claim 5 provides the ozone sterilization apparatus according to any one of claims 1 to 4 ,
The nonvolatile storage section includes a backup register.

Further, the invention according to claim 6 provides the ozone sterilization apparatus according to any one of claims 1 to 5 ,
The nonvolatile storage unit includes a portable storage medium.

Further, the invention according to claim 7 provides the ozone sterilization apparatus according to claim 6 ,
a lid that covers the portable storage medium;
a housing body to which the lid body is attached;
Equipped with
The lid body can be removed from the housing body using a special tool.

Further, the invention according to claim 8 provides the ozone sterilization apparatus according to any one of claims 1 to 7 ,
The ozone gas generated by the ozone generator has a concentration that can be used in a manned environment.

Further, the invention according to claim 9 provides the ozone sterilization apparatus according to any one of claims 1 to 8 ,
A display section;
a display control unit that causes the display unit to display the CT value calculated by the calculation unit;
Equipped with.

Moreover, the invention according to claim 10 is the ozone sterilization apparatus according to any one of claims 1 to 9 ,
an operation control unit that executes an operation related to ozone generation based on settings immediately before the power supply to the ozone sterilizer is cut off when the power supply is restarted after the power supply to the ozone sterilizer is cut off; .

According to the present invention, sterilization using ozone can be performed more effectively.

FIG. 1 is a schematic diagram of an ozone sterilization device. FIG. 2 is a block diagram showing the functional configuration of an ozone sterilization device. It is a figure showing an example of an operation part and a display part. FIG. 3 is a diagram showing an example of ports of a communication unit. FIG. 3 is a structural diagram of the lid and the casing body near the lid. FIG. 5A is a cross-sectional view taken along the line VB-VB in FIG. 5A. 7 is a flowchart showing the flow of settings saving processing. 3 is a flowchart showing the flow of acquired data storage processing. FIG. 6 is a diagram showing an example of saved save timing times and CT values (obtained data). FIG. 6 is a diagram showing an example of saved save timing times and CT values (obtained data). FIG. 7 is a diagram showing an example of saved save timing times and CT values (obtained data). FIG. 3 is a diagram showing an example of saved storage timing times and ozone concentrations (obtained data). FIG. 3 is a diagram showing an example of saved storage timing times and ozone concentrations (obtained data). It is a flowchart which shows the flow of restart processing. It is a block diagram which shows roughly the structure of the ozone sterilization apparatus of a modification.

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

(Configuration of ozone sterilizer 100)
As shown in FIGS. 1 and 2, an ozone sterilizer 100 according to a preferred embodiment of the present invention includes a control section 11, a storage section 12, an operation section 13, a display section 14, a communication section 15, and an ozone concentration It includes a measurement section 16, an ozone generation section 17, a diffusion section 18, a power supply section 20, a housing body 30, a lid body 31 attached to the housing body 30, and the like.

The control unit 11 is a part that controls the operation of the ozone sterilizer 100. Specifically, the computer is configured with a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc., and is stored in the ROM developed in the RAM work area and in the storage unit 12. Through cooperation between the program and the CPU, each part of the ozone sterilizer 100 is controlled in an integrated manner.

Further, the control unit 11 measures the elapsed time after the ozone generation unit 17 starts generating ozone gas. Here, the control section 11 functions as a time measurement section.
Further, the control unit 11 calculates the CT value based on the ozone concentration measured by the ozone concentration measurement unit 16 and the elapsed time measured by the time measurement unit. Here, the control section 11 functions as a calculation section.
Further, the control unit 11 stores data regarding ozone generation in a nonvolatile storage unit (described later). Here, the control unit 11 functions as a storage unit.
Further, the control unit 11 causes the calculated CT value display unit 141 (display unit 14) to display the CT value calculated by the calculation unit. Here, the control section 11 functions as a display control section.
In addition, when the power supply to the ozone sterilizer 100 is restarted after the power supply to the ozone sterilizer 100 is cut off, the control unit 11 controls the ozone sterilization device 100 to Execute generation operation (operation related to ozone generation). Here, the control section 11 functions as an operation control section.

The storage unit 12 is composed of, for example, an HDD (Hard Disk Drive), a semiconductor memory, etc., and is a storage unit in which data and programs can be written and read.

The operation unit 13 receives an operation input from a user and outputs an operation signal according to the operation input to the control unit 11.
FIG. 3 shows an example of the operation section 13 and the display section 14.
As shown in FIG. 3, the operation unit 13 includes an ON/OFF button 131, a Concentration button 132, a Level button 133, and a Clear button 134.

The ON/OFF button 131 accepts the start or stop of the ozone generation operation in the ozone sterilizer 100.
Concentration button 132 accepts setting of a target value of ozone concentration in the environment in which ozone sterilizer 100 is installed. In the example shown in FIG. 3, the target value of ozone concentration can be selected from either 0.09 [ppm] or 0.05 [ppm]. The target value of the ozone concentration is arbitrary as long as it is a low concentration that can be used in a manned environment (specifically, 0.10 [ppm] or less, or 0.05 ppm or less, which is the concentration permissible for the human body). It may be possible to set the value to .
The Level button 133 accepts settings for the amount of ozone generated by the ozone generator 17. In the example shown in FIG. 3, the Level button 133 accepts setting of the ozone generation amount in five levels from 1 to 5.
The Clear button 134 accepts clearing of a maintenance implementation timing notification (described later) for the ozone sterilizer 100.

The display unit 14 displays various information according to instructions of a display control signal input from the control unit 11.
As shown in FIG. 3, the display section 14 includes a calculated CT value display section 141, an ON/OFF display section 142, a Concentration display section 143, a Level display section 144, a Clear display section 145, and a reached CT value display section. 146.

Further, as shown in FIG. 3, the ON/OFF button 131 and the ON/OFF display section 142, the Concentration button 132 and the Concentration display section 143, the Level button 133 and the Level display section 144, the Clear button 134 and the Clear display section 145, They are arranged in one-to-one correspondence in the vertical direction of the paper.

The calculated CT value display section 141 displays the CT value calculated by the control section 11 (calculation section).
The ON/OFF display unit 142 lights up a green LED, for example, when the ON/OFF button 131 is pressed and the ozone generation operation of the ozone sterilizer 100 is ON (when the ozone generation operation is started).
Concentration display section 143 lights up an LED corresponding to the target value of ozone concentration selected by pressing Concentration button 132 . In the example shown in FIG. 3, the LED corresponding to 0.05 [ppm] is lit.
The Level display section 144 displays the level of ozone generation amount selected by pressing the Level button 133. In the example shown in FIG. 3, "3" is displayed among the levels of ozone generation amount.
The Clear display unit 145 lights up the LED in red as a maintenance implementation time notification indicating that the ozone sterilizer 100 has reached the maintenance implementation time. Furthermore, when the user performs maintenance and presses the Clear button 134, the Clear display section 145 lights up the LED in blue.
The reached CT value display section 146 turns on the LED corresponding to the predetermined CT value when the CT value calculated by the control section 11 (calculation section) reaches a predetermined CT value. In the example shown in FIG. 3, the LEDs corresponding to CT values 60 and 330 are lit.

The communication unit 15 performs data communication with an external device under the control of the control unit 11 using a predetermined communication protocol. Specifically, the communication unit 15 is a communication interface having a communication IC (Integrated Circuit), a communication connector, etc., and is a communication interface that has a communication IC (Integrated Circuit), a communication connector, etc. data communication with external devices connected by wire or wirelessly.

Furthermore, as shown in FIG. 4, the communication unit 15 includes a port 151 into which a portable storage medium 200, which is a nonvolatile storage unit, can be inserted. In the example shown in FIG. 4, the communication unit 15 has a port 1511 into which a microSD card (registered trademark), which is the portable storage medium 200, can be inserted, and a USB (Universal Serial Bus), which is the portable storage medium 200. A port 1512 into which a registered trademark memory can be inserted is provided.
Note that the communication unit 15 may be configured to include either one of the port 1511 and the port 1512.
Furthermore, the configuration may be such that other portable storage media can be inserted instead of the microSD card or USB memory.
The portable storage medium 200 stores the time of the storage timing (described later), and acquired data (described later) that is the ozone concentration measured at the storage timing and the calculated CT value.
Furthermore, the portable storage medium 200 can be removed from the port 151 after the ozone sterilizer 100 is powered off.

Furthermore, the port 151 and the portable storage medium 200 inserted into the port 151 are covered by the lid 31 .
FIG. 5A shows a structural diagram of the lid 31 and the casing body 30 near the lid 31. Further, FIG. 5B shows a cross-sectional view taken along the line VB-VB in FIG. 5A.
As shown in FIG. 5B, the lid 31 includes a protrusion 311 and an opening 312. The housing body 30 includes a coupling portion 32 that couples with the protrusion 311 .
The protrusion 311 and the coupling part 32 are coupled by a snap fit.
The opening 312 is used to disconnect the protrusion 311 and the coupling part 32, and the size of the opening is such that a human finger cannot fit therein.
The lid 31 and the housing body 30 can be removed by inserting a small special tool (such as a flat head screwdriver) into the opening 312 and pushing the projection 311 upward. The structure allows the lid 31 to be removed from the housing body 30 by uncoupling the coupling portion 32.
By making the lid body 31 and the housing body 30 have the above-described structure, even when the ozone sterilizer 100 is installed in an environment where an unspecified number of people are present, the portable storage medium 200 storing data can be used. The structure may be such that it cannot be easily removed.

The ozone concentration measuring section 16 measures the ozone concentration in the air in the environment in which the ozone sterilization device 100 is installed using an ultraviolet absorption method, a semiconductor thin film method, or the like, and outputs the measurement result to the control section 11 . Note that the method for measuring ozone concentration is not limited to the above method.

Under the control of the control unit 11, the ozone generating unit 17 generates ozone at a low concentration that can be used in a manned environment (specifically, a concentration that is permissible for the human body) using a silent discharge type, an ultraviolet lamp type, a creeping discharge type, etc. 0.10 [ppm] or less, or 0.05 ppm or less) ozone gas is generated. Note that the method for generating ozone gas is not limited to the above method.

The diffusion section 18 diffuses the ozone gas generated by the ozone generation section 17 into the environment in which the ozone sterilization device 100 is installed.
The diffusion unit 18 is, for example, a fan motor, and rotates the fan to generate an air flow and diffuse the ozone gas.
Note that the diffusion section 18 may be configured to diffuse the ozone gas using an upward air current obtained by warming the air within the ozone sterilization apparatus 100.
Further, if there is air flow in the environment in which the ozone sterilizer 100 is installed, the ozone sterilizer 100 does not need to include the diffusion section 18.

The power supply unit 20 converts power supplied from the outside into power necessary for each part within the ozone sterilization apparatus 100 and supplies the power.

(Operation of ozone sterilizer 100)
Next, the operation of the ozone sterilizer 100 will be explained.
The control unit 11 executes the setting saving process shown in FIG. 6 at predetermined time intervals (for example, one minute) while the ozone sterilization apparatus 100 is powered on.

First, the control unit 11 determines whether the settings for the ozone generation operation have been changed by a user's input operation via the operation unit 13 (step S1).
The ozone generation operation includes controlling the ozone generation section 17 to generate ozone gas, controlling the diffusion section 18 to diffuse the generated ozone gas, and displaying the current setting state of the ozone generation operation on the display section 14. Contains settings display operations.
As a setting display operation, the control unit 11 displays a CT value, which is the product of the ozone concentration obtained by controlling the ozone concentration measurement unit 16 and the elapsed time since the start of the ozone generation operation, on the calculated CT value display unit 141. indicate. Further, the LED of the ON/OFF display section 142 is turned on in accordance with the ON/OFF of the ozone generation operation set by pressing the ON/OFF button 131. Further, the LED of the Concentration display section 143 corresponding to the target value of ozone concentration in the environment in which the ozone sterilizer 100 is installed, which is selected by pressing the Concentration button 132, is turned on. Further, the control unit 11 displays, on the Level display unit 144, the level of ozone generation amount in the ozone generation unit 17, which is set by pressing the Level button 133. In addition, the control unit 11 lights the LED of the Clear display unit 145 in red when the ozone sterilizer 100 has reached the maintenance time, and otherwise lights the LED of the Clear display unit 145 in blue. Light. Further, when the calculated CT value reaches a predetermined CT value, the control unit 11 lights up the LED corresponding to the predetermined CT value on the reached CT value display unit 146.
The settings for the ozone generation operation include ON/OFF settings for the ozone generation operation, settings for the target value of ozone concentration in the environment in which the ozone sterilizer 100 is installed, and settings for the stages of the ozone generation amount in the ozone generation section 17. The maintenance notification has been cleared.
If the settings for the ozone generation operation are not changed (step S1; NO), the control unit 11 ends this process.

When the settings in the ozone generation operation are changed (step S1; YES), the control unit 11 determines whether or not a state in which there is no user input operation via the operation unit 13 continues for a predetermined period of time (for example, 3 seconds). (Step S2).
If the user performs an input operation within the predetermined time (step S2; NO), the control unit 11 moves the process to step S2. In other words, it waits until there is no user input operation for a predetermined period of time.

If a state in which there is no user input operation continues for a predetermined period of time (step S2; YES), the control unit 11 stores information on the current ozone generation operation in the portable storage medium 200 (nonvolatile storage unit) inserted into the port 151. Save the settings (step S3).
In addition, in step S3, the control unit 11 may save only the items changed in step S1 among the settings in the ozone generation operation.

Further, during the ozone generation operation, the control unit 11 executes the acquired data storage process shown in FIG. 7 at predetermined time intervals (for example, in minutes, specifically, one minute).

First, the control unit 11 controls the ozone concentration measurement unit 16 to obtain the ozone concentration in the air in the environment where the ozone sterilization device 100 is installed (step S11).
Next, the control unit 11 calculates a CT value, which is the product of the ozone concentration obtained in step S11 and the elapsed time after starting the ozone generation operation (step S12).

Next, the control unit 11 determines whether it is time to save the ozone concentration obtained in step S11 and the CT value calculated in step S12 (step S13). The storage timing is when a predetermined time (for example, in minutes, specifically 1 minute) has elapsed since the ozone concentration and CT value were last saved.
CT value [ppm x min] is calculated by the product of ozone concentration [ppm] and ozone exposure time (fumigation time) [min], so ozone concentration and CT value should be saved at time intervals of minutes. This allows the user to use the stored ozone concentration and CT value to further improve work efficiency when verifying the CT value.
Further, during the ozone generation operation of the ozone sterilizer 100, a power outage or a user accidentally unplugging the power outlet occurs, and after the power supply to the ozone sterilizer 100 is cut off, the power supply is restarted. In such a case, the control unit 11 can easily restore the CT value before the power supply was cut off using the ozone concentration stored at time intervals of minute values. Processing when the power supply is restarted after the power supply to the ozone sterilizer 100 is cut off during the ozone generation operation of the ozone sterilizer 100 (restart process shown in FIG. 10) will be described in detail later.
Note that the predetermined time is not limited to one minute, and may be, for example, 10 seconds or 5 minutes.
Further, the predetermined time may be arbitrarily set by the user via the communication unit 15.

If it is the storage timing (step S13; YES), the control unit 11 stores the storage timing time, the ozone concentration acquired in step S11, and the ozone concentration acquired in step S11 in the portable storage medium 200 (nonvolatile storage unit) inserted into the port 151. The CT value calculated in step S12 is saved (step S14), and this process ends.
Here, the ozone concentration acquired in step S11 and the CT value calculated in step S12 are acquired data, and are data related to ozone generation.

In addition, in step S14, the control unit 11 may save the ozone concentration obtained at the storage timing (for example, one minute has passed since the ozone concentration and CT value were last saved), or may save the ozone concentration obtained at the storage timing (for example, when one minute has passed since the ozone concentration and CT value were last saved), or between the storage timings. The ozone concentration may be acquired at predetermined intervals (for example, several seconds) and the average value of the plurality of measurement results may be saved.
Further, in step S14, the control unit 11 may store either the ozone concentration obtained in step S11 or the CT value calculated in step S12 as the obtained data.

8A to 8C show examples of save timing times and CT values (obtained data) saved in the nonvolatile storage unit.
In the examples shown in FIGS. 8A to 8C, the CT value (B) calculated at the storage timing (A) is stored.
In the example shown in FIG. 8A, the storage timing (A) is every 30 minutes.
Furthermore, in the example shown in FIG. 8B, the storage timing (A) is every minute.
Further, in the example shown in FIG. 8C, only the CT value (B) calculated at the latest storage timing (A) is stored. In this case, the amount of data held in the nonvolatile storage section can be suppressed.

Further, FIGS. 9A and 9B show examples of the storage timing and ozone concentration (obtained data) stored in the nonvolatile storage unit.
In the example shown in FIGS. 9A and 9B, the ozone concentration (C) acquired at the storage timing (A) is stored.
In the example shown in FIG. 9A, the storage timing (A) is every second.
In the example shown in FIG. 9B, the storage timing (A) is every minute.
When continuous time-series data of ozone concentration is stored at predetermined time intervals (at time intervals of values in minutes) as described above, during the ozone generation operation of the ozone sterilizer 100, the ozone sterilizer 100 When the power supply is restarted after the power supply is cut off, the control unit 11 can easily restore the CT value before the power supply was cut off using the ozone concentration data.
Furthermore, if continuous time-series data of ozone concentration is stored in the portable storage medium 200 at predetermined time intervals (at time intervals of values in minutes) as described above, the user can Continuous time-series data of ozone concentration is acquired from 200, and the validity of the CT value restored by the control unit 11 before the power supply is cut off can be easily verified.

Furthermore, as described above, by configuring the storage timing and acquired data to be stored in the portable storage medium 200, the storage capacity of the nonvolatile storage unit (portable storage medium 200) can be easily increased. Therefore, even if the time of the save timing and the amount of acquired data are large, the data can be saved, and the redundancy of the ozone sterilization apparatus 100 can be improved.

If it is not the storage timing (step S13; NO), the control unit 11 temporarily stores the storage timing time, the ozone concentration acquired in step S11, and the CT value calculated in step S12 in the RAM of the control unit 11. The data is saved (step S15), and the process ends.

Further, the control unit 11 executes the restart process shown in FIG. 10 when the power supply to the ozone sterilizer 100 is restarted after the power supply to the ozone sterilizer 100 is interrupted during the ozone generation operation of the ozone sterilizer 100.

First, the control unit 11 reads out the settings for the ozone generation operation stored in the nonvolatile storage unit in step S3 of the settings storage process shown in FIG. 6 (step S31).
Next, the control unit 11 determines whether or not the ozone generation operation is ON in the settings for the ozone generation operation read in step S31 (step S32).
In the settings for the ozone generation operation, if the ozone generation operation is OFF (step S32; NO), the control unit 11 ends this process.

Further, in the settings for the ozone generation operation, if the ozone generation operation is ON (step S32; YES), the control unit 11 starts the ozone generation operation based on the settings for the ozone generation operation read out in step S31, Measurement of the elapsed time after starting the ozone generation operation is started (step S33).
That is, when the power supply to the ozone sterilizer 100 is restarted after the power supply to the ozone sterilizer 100 is cut off, the control unit 11 generates ozone Execute generation operation (operation related to ozone generation).
Therefore, when the ozone sterilizer 100 is installed in a medical facility and a power outage occurs in the medical facility and the power is switched to emergency power, the user, a medical worker, can restart the operation of the ozone sterilizer 100. Since there is no need to perform any additional work, the burden on medical personnel can be reduced.

Next, in step S14 of the acquired data storage process shown in FIG. 7, the control unit 11 reads out the storage timing and acquired data stored in the non-volatile storage unit (step S34). In step S34, for example, the control unit 11 reads the latest storage timing and acquired data stored in the nonvolatile storage unit.
Next, the control unit 11 determines whether the difference between the latest storage timing read in step S34 (last storage time) and the current time is within a predetermined first threshold (for example, 1 minute). (Step S35).

If the difference between the latest storage timing and the current time is within a predetermined first threshold (for example, 1 minute) (step S35; YES), the control unit 11 saves the current time at the latest storage timing read in step S34. The current CT value is calculated by adding the CT value after starting the ozone generation operation in step S33 to the stored CT value (step S36).
In addition, in step S36, the control unit 11 restores (calculates) the CT value before the power supply is cut off based on the ozone concentration data stored in the nonvolatile storage unit, and restores (calculates) the CT value before the power supply is cut off. The current CT value may be calculated by adding the CT value after starting the ozone generation operation to the CT value.
Next, the control unit 11 displays the calculated current CT value on the calculated CT value display unit 141. Further, when the calculated CT value reaches a predetermined CT value, the control unit 11 lights up the LED corresponding to the predetermined CT value on the reached CT value display unit 146 (step S37), and then executes this process. finish.

Further, if the difference between the latest storage timing and the current time is not within a predetermined first threshold (for example, 1 minute) (step S35; NO), the control unit 11 controls the difference between the latest storage timing and the current time. It is determined whether the difference is within a predetermined second threshold (for example, 5 minutes) (step S38). The predetermined second threshold value may be a value longer than the predetermined first threshold value.
If the difference between the latest storage timing and the current time is within the predetermined second threshold (for example, 5 minutes) (step S38; YES), the control unit 11 saves the data at the latest storage timing read in step S34. The current CT value is calculated by adding the CT value after starting the ozone generation operation in step S33 to the value attenuated from the stored CT value (step S39), and the process is transferred to step S37. Transition.
In addition, in step S39, the control unit 11 restores (calculates) the CT value before the power supply is cut off based on the ozone concentration data stored in the nonvolatile storage unit, and restores (calculates) the CT value before the power supply is cut off. The current CT value may be calculated by adding the CT value after starting the ozone generation operation to the value attenuated from the CT value.
In step S39, as the value attenuated from the CT value stored at the latest storage timing, a value that is half of the CT value stored at the latest storage timing may be used, or a value that is half of the CT value stored at the latest storage timing may be used. A value obtained by subtracting an attenuation value based on time in the environment in which the ozone sterilizer 100 is installed may be used from the CT value stored at the timing.

Note that instead of step S38, the control unit 11 controls the ozone concentration measurement unit 16 to obtain the current ozone concentration, and determines that the difference between the current ozone concentration and the ozone concentration stored at the latest storage timing is a predetermined value. It may be determined whether or not the value is within the value.

Further, if the difference between the latest storage timing and the current time is not within a predetermined second threshold (for example, 5 minutes) (step S38; NO), the control unit 11 starts the ozone generation operation in step S33. The CT value from is calculated as the current CT value (step S40), and the process moves to step S37.

In this way, if the time from when the power supply to the ozone sterilizer 100 is cut off until it is restarted is a short time, for example, within 1 minute (predetermined first threshold value), specifically, the ozone sterilizer 100 Only if a power outage occurs in a medical facility where 100 is installed and the power supply is switched to emergency power for a short time, the current CT value after restarting ozone generation will inherit the CT value immediately before the power supply was cut off. By doing so, the current CT value can be calculated accurately.
In addition, if the time from when the power supply to the ozone sterilizer 100 is cut off until it is restarted is longer than a predetermined first threshold value and within a predetermined second threshold value, the CT value after restarting the ozone generation operation is By adding the attenuated value of the CT value immediately before the power supply is cut off, the current CT value can be calculated accurately.

(Modified example)
Next, a modification of the above embodiment will be described.
Below, differences from the above embodiment will be mainly explained.

FIG. 11 shows the configuration of an ozone sterilizer 100 of this modification.
The control unit 11 of this modification includes a backup register 111 that is a nonvolatile storage unit, and the power supply unit 20 includes a primary battery 21. The other configurations are the same as the ozone sterilizer 100 of the above embodiment.

The primary battery 21 is connected to the backup register 111, and even when the power supply to the ozone sterilizer 100 is cut off, the data stored in the backup register 111 can be retained.

In the setting saving process of this modification, the control unit 11 saves the settings for the ozone generation operation in the backup register 111.
Furthermore, in the acquired data storage process of this modification, the control unit 11 stores the storage timing and the acquired data in the backup register 111.
Therefore, the save timing and acquired data can be saved without using the portable storage medium 200 as in the above embodiment.

The ozone sterilization apparatus 100 according to the present embodiment described above includes an ozone generation section 17 that generates ozone gas, an ozone concentration measurement section 16 that measures the ozone concentration in the air, and an ozone generation section 17 that generates ozone gas. The CT value is calculated based on the ozone concentration measured by the time measurement unit (control unit 11) that measures the elapsed time from the start, the ozone concentration measurement unit 16, and the elapsed time measured by the time measurement unit. The ozone sterilizer 100 includes a calculation unit (control unit 11) that performs ozone generation, and a storage unit (control unit 11) that stores data regarding ozone generation in a nonvolatile storage unit (portable storage medium 200 or backup register 111). Then, when the power supply to the ozone sterilizer 100 is restarted after being cut off, the calculation unit calculates the CT value after the power supply is restarted based on the data regarding ozone generation stored in the non-volatile storage unit. calculate.
Therefore, the current CT value can be accurately calculated based on the data regarding ozone generation that was saved before the power supply was cut off, so the user can improve the sterilization by ozone based on the current CT value. Can be implemented effectively.

Further, in the ozone sterilizer 100 according to the present embodiment, the calculation unit calculates the difference between the last storage time at which data regarding ozone generation was saved by the storage unit before the power supply to the ozone sterilizer 100 was cut off, and the current time. If the difference is within a predetermined threshold (first threshold), the CT value after power supply is resumed is calculated based on the data related to ozone generation stored in the nonvolatile storage unit.
Therefore, if the difference between the last saved time and the current time is within a predetermined threshold, the current CT value after restarting the ozone generation operation will inherit the CT value immediately before the power supply was cut off. Since the CT value can be calculated accurately, the user can more effectively perform sterilization with ozone based on the current CT value.

Further, in the ozone sterilizer 100 according to the present embodiment, the predetermined threshold is 1 minute.
Therefore, only when the time from when the power supply to the ozone sterilizer 100 is cut off to when it is restarted is a short time of less than 1 minute, the power supply is cut off at the current CT value after the ozone generation operation is restarted. By inheriting the previous CT value, the current CT value can be calculated accurately.

Moreover, in the ozone sterilization apparatus 100 according to the present embodiment, the data regarding ozone generation includes the CT value calculated by the calculation unit.
Therefore, when only the CT value calculated at the latest storage timing is stored, the amount of data held in the nonvolatile storage section can be suppressed.

Further, in the ozone sterilization apparatus 100 according to the present embodiment, the data regarding ozone generation includes the ozone concentration measured by the ozone concentration measuring section 16.
Therefore, when the power supply is restarted after the power supply to the ozone sterilizer 100 is interrupted during the ozone generation operation of the ozone sterilizer 100, the control unit 11 controls the ozone concentration stored in the non-volatile storage unit. Using this data, the CT value before the power supply was cut off can be easily restored.
In addition, if the ozone concentration data is stored in the portable storage medium 200, the user can obtain the ozone concentration data from the portable storage medium 200 and obtain the data before the power supply is restored by the control unit 11. The validity of the CT value can be easily verified.

Furthermore, in the ozone sterilization apparatus 100 according to the present embodiment, the storage unit stores data regarding ozone generation in the nonvolatile storage unit at time intervals of minutes.
Therefore, the CT value [ppm x min] is calculated by the product of the ozone concentration [ppm] and the ozone exposure time (fumigation time) [min], so the ozone concentration and CT value are stored at time intervals of minutes. By doing so, the user can further improve the workability when verifying the CT value using the stored ozone concentration and CT value.

Furthermore, in the ozone sterilizer 100 according to this embodiment, the nonvolatile storage section includes a backup register 111.
Therefore, the save timing and acquired data can be saved without using the portable storage medium 200.

Furthermore, in the ozone sterilization apparatus 100 according to the present embodiment, the nonvolatile storage section includes a portable storage medium 200.
Therefore, the storage capacity of the non-volatile storage unit (portable storage medium 200) can be easily increased, so even if the storage timing and the amount of acquired data are large, the data can be stored and ozone sterilized. The redundancy of the device 100 can be improved.

Further, the ozone sterilizer 100 according to the present embodiment includes a lid 31 that covers the portable storage medium 200, and a housing body 30 to which the lid 31 is attached, and the lid 31 can be assembled using a special tool. This allows it to be removed from the housing body 30.
Therefore, even if the ozone sterilizer 100 is installed in an environment where there are many unspecified people, the structure can be such that the portable storage medium 200 storing data cannot be easily removed.

Furthermore, in the ozone sterilizer 100 according to the present embodiment, the ozone gas generated by the ozone generator 17 has a concentration that can be used in a manned environment.
Therefore, the ozone sterilizer 100 is operated continuously for a long time by generating low-concentration ozone gas that can be used in a manned environment. When the power supply is restarted after the power supply has been cut off, the current CT value after restarting the ozone generation operation is inherited from the CT value immediately before the power supply was cut off. It can be calculated accurately.

The ozone sterilizer 100 according to the present embodiment also includes a display section 14 (calculated CT value display section 141), and a display control section (control section 11) that causes the display section 14 to display the CT value calculated by the calculation section. , is provided.
Therefore, the user can understand the calculated CT value.

Moreover, when the power supply to the ozone sterilizer 100 is restarted after the power supply to the ozone sterilizer 100 is cut off, the ozone sterilizer 100 according to the present embodiment is configured to operate based on the settings immediately before the power supply to the ozone sterilizer 100 is cut off. , an operation control unit (control unit 11) that executes operations related to ozone generation.
Therefore, when the ozone sterilizer 100 is installed in a medical facility and a power outage occurs in the medical facility and the power is switched to emergency power, the user, a medical worker, can restart the operation of the ozone sterilizer 100. Since there is no need to perform any additional work, the burden on medical personnel can be reduced.

In addition, the description in this embodiment is an example of the suitable ozone sterilization apparatus based on this invention, and is not limited to this.

For example, in the above embodiment, the nonvolatile storage unit is the portable storage medium 200, and in the modified example, the nonvolatile storage unit is the backup register 111, but the present invention is not limited to this. The ozone sterilizer 100 may include an NVRAM (Non-Volatile Random Access Memory) or an EEPROM (Electrically Erasable Programmable Read-Only Memory) mounted on the same board as the control unit 11 as a nonvolatile storage unit.

100 Ozone sterilizer 11 Control unit (time measurement unit, calculation unit, storage unit, display control unit, operation control unit)
111 Backup register (non-volatile storage)
12 Storage section 13 Operation section 131 ON/OFF button 132 Concentration button 133 Level button 134 Clear button 14 Display section 141 Calculated CT value display section 142 ON/OFF display section 143 Concentration display section 144 Level l display section 145 Clear display section 146 Reached CT Value display section 15 Communication section 151 Port 1511 Port 1512 Port 16 Ozone concentration measurement section 17 Ozone generation section 18 Diffusion section 20 Power supply section 21 Primary battery 30 Housing body 31 Lid body 32 Coupling section 200 Portable storage medium (non-volatile storage section )

Claims (10)

an ozone generating section that generates ozone gas;
an ozone concentration measuring section that measures ozone concentration in the air;
a time measuring unit that measures the elapsed time after the ozone generating unit starts generating ozone gas;
a calculation unit that calculates a CT value based on the ozone concentration measured by the ozone concentration measurement unit and the elapsed time measured by the time measurement unit;
a storage unit that stores the ozone concentration and/or the CT value in a nonvolatile storage unit;
An ozone sterilization device comprising:
When the power supply is restarted after the power supply to the ozone sterilization apparatus is cut off, the calculation unit calculates the CT value after the power supply is restarted based on the ozone concentration or the CT value stored in the nonvolatile storage unit. Ozone sterilizer that calculates the value. The calculation unit is configured to determine whether the difference between the current time and the last storage time at which the ozone concentration and/or the CT value was stored by the storage unit before the power supply to the ozone sterilizer was cut off is within a predetermined threshold. If so, the ozone sterilizer according to claim 1, wherein the CT value after power supply is restarted is calculated based on the ozone concentration or the CT value stored in the nonvolatile storage unit. The ozone sterilizer according to claim 2, wherein the predetermined threshold is 1 minute. The ozone sterilizer according to any one of claims 1 to 3, wherein the storage unit stores the ozone concentration and/or the CT value in the nonvolatile storage unit at time intervals of minutes. The ozone sterilizer according to any one of claims 1 to 4 , wherein the nonvolatile storage section includes a backup register. The ozone sterilizer according to any one of claims 1 to 5 , wherein the nonvolatile storage section includes a portable storage medium. a lid that covers the portable storage medium;
a housing body to which the lid body is attached;
Equipped with
The ozone sterilizer according to claim 6 , wherein the lid can be removed from the housing body using a special tool. The ozone sterilizer according to any one of claims 1 to 7 , wherein the ozone gas generated by the ozone generator has a concentration that can be used in a manned environment. A display section;
a display control unit that causes the display unit to display the CT value calculated by the calculation unit;
The ozone sterilizer according to any one of claims 1 to 8 , comprising: an operation control unit that executes an operation related to ozone generation based on settings immediately before the power supply to the ozone sterilizer is cut off when the power supply is restarted after the power supply to the ozone sterilizer is cut off; The ozone sterilizer according to any one of claims 1 to 9 .

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