JP2022161953A - Sterilization device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sterilization device capable of preferably sterilizing virus and the like floating in a space or adhering to a surface of an article.

SOLUTION: A sterilization device of the disclosure comprises: a chemical liquid tank for storing a sterilization solution including a prescribed bactericidal agent; a sprayer for spraying the sterilization solution stored in the chemical liquid tank; a sensor for detecting a liquid level of the sterilization solution stored in the chemical liquid tank; an agitator for agitating the sterilization solution stored in the chemical liquid tank, the agitator comprising a vane wheel arranged to be submerged in the sterilization solution, and a drive shaft whose one end is coupled to the vane wheel and the other end extends substantially vertically to the liquid level of the sterilization solution; a motor for driving the agitator by being coupled to the drive shaft through a prescribed coupling; and a control machine for controlling driving of the motor. The vane of the vane wheel has a prescribed angle to the liquid level of the sterilization solution stored in the chemical liquid tank.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a sterilization device that sterilizes viruses and the like floating in space or adhering to surfaces of objects.

BACKGROUND ART Conventionally, it has been known to suppress the proliferation of viruses floating in the air by humidifying the air in a space such as a room. In order to further reduce viruses, a technique of spraying a space with an aqueous solution containing a disinfectant has been proposed.

Patent Document 1 discloses an air cleaner that includes a drug supply device that supplies an undiluted solution of a sterilant solution and a dilution water system that supplies dilution water for diluting the sterilant solution, and sprays the sterilant solution into the air to be sterilized. An apparatus is disclosed. According to this technique, the disinfectant solution is sprayed directly into the air, so that the disinfectant solution comes into gas-liquid contact with the bacteria in the air, thereby sterilizing them.

JP 2013-226373 A

When a solution containing a chemical agent such as a disinfectant is to be sprayed indoors, if the concentration of the chemical agent is high, there is a risk of phytotoxicity when a person inhales it or adheres to the eyes or skin. On the other hand, if the concentration of the drug is low, there is a possibility that a sufficient sterilization effect cannot be obtained.

According to the air purifier disclosed in Patent Document 1, the mixing ratio of the drug and the dilution water in the disinfectant solution can be set within a predetermined range by adjusting the flow rate of the dilution water. According to this, it is thought that the drug concentration in the disinfectant solution can be maintained within a range in which a sufficient spatial disinfection effect can be obtained while suppressing phytotoxicity to humans. However, if uneven mixing of the drug and dilution water occurs in the sterilant solution, intermittent spraying of the sterilant solution containing a high concentration of the drug may cause phytotoxicity to humans. By intermittently spraying a disinfectant solution containing a low-concentration drug, a sufficient sterilization effect may not be obtained and the sprayed drug may be wasted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique for suitably sterilizing viruses and the like floating in space or adhering to surfaces of objects.

The sterilization device disclosed in the present application includes a chemical tank that stores a sterilizing solution containing a predetermined sterilizing agent, a sprayer that sprays the sterilizing solution stored in the chemical tank, and the a sensor for detecting the liquid level of the sterilizing solution; a stirrer for stirring the sterilizing solution stored in the chemical solution tank, the impeller arranged so as to be submerged in the sterilizing solution; a stirrer having a drive shaft with one end connected to the impeller and the other end extending in a substantially vertical direction with respect to the liquid surface of the sterilizing solution; and a predetermined coupling connected to the drive shaft. is provided with an electric motor that drives the stirrer and a controller that controls the driving of the electric motor, and the blades of the impeller move against the liquid surface of the sterilization solution stored in the chemical solution tank. has a predetermined angle.

In such a configuration, the sterilization solution stored in the chemical liquid tank is stirred by rotating the impeller of the agitator arranged so as to be submerged in the sterilization solution. Here, the blades of the impeller have a predetermined angle with respect to the liquid surface of the sterilizing solution stored in the chemical tank. According to this, the sterilization solution stored in the chemical liquid tank can be suitably stirred, and the occurrence of uneven mixing of the predetermined sterilization agent and the dilution water in the sterilization solution can be suppressed as much as possible. . The predetermined sterilizing agent is, for example, hypochlorous acid. In this case, hypochlorous acid water containing hypochlorous acid and dilution water is used as the sterilization solution. Also, the predetermined angle is, for example, 45°. Then, the sterilization solution stored in the chemical liquid tank is sprayed by the sprayer, thereby enabling sterilization using the sterilization device disclosed in the present application.

According to the disclosure of the present application, viruses and the like floating in space or adhering to the surfaces of objects can be preferably sterilized.

1 is a diagram showing a schematic configuration of a sterilization device according to a first embodiment; FIG. FIG. 4 is a diagram for explaining the geometric relationship between the blades of the impeller of the stirrer and the liquid surface of the sterilizing solution stored in the chemical liquid tank in the first embodiment; FIG. 2 is a first diagram for explaining how the sterilization device according to the first embodiment is used; FIG. 2B is a second view for explaining the mode of use of the sterilization device according to the first embodiment; FIG. 11 is a first diagram for explaining a mode of use of the sterilization device according to the modified example of the first embodiment; FIG. 11 is a second diagram for explaining a mode of use of the sterilization device according to the modified example of the first embodiment; FIG. 11 is a third diagram for explaining a mode of use of the sterilization device according to the modified example of the first embodiment; FIG. 5 is a diagram showing a schematic configuration of a sterilization device according to a second embodiment; FIG. 10 is a diagram for explaining the movement of the impeller and drive shaft of the stirrer in the second embodiment; FIG. 10 is a diagram showing a schematic configuration of a sterilization device according to a third embodiment;

Embodiments disclosed in the present application will be described below based on the drawings. The configurations of the following embodiments are examples, and the disclosure of the present application is not limited to the configurations of the embodiments.

<First embodiment>
A sterilization device according to a first embodiment will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a diagram showing a schematic configuration of a sterilization device according to this embodiment. The sterilization apparatus 1 according to this embodiment includes a chemical tank 10 that stores a sterilization solution S1, a sprayer 20 that sprays the sterilization solution S1 stored in the chemical tank 10, and a sterilizer stored in the chemical tank 10. A stirrer 30 for stirring the solution S1, an electric motor 40 for driving the stirrer 30, a sensor 50 for detecting the liquid level of the sterilizing solution S1 stored in the chemical solution tank 10, and a controller for controlling the drive of the electric motor 40. 60 and.

The chemical liquid tank 10 is made of a well-known material that is resistant to the sterilization solution S1 containing a predetermined sterilization agent. Here, the predetermined disinfectant is hypochlorous acid, for example. In this case, hypochlorous acid water containing hypochlorous acid and dilution water is used as the sterilization solution S1. The effective chlorine concentration in the sterilization solution S1 (hypochlorous acid water) at this time is, for example, 35 ppm to 100 ppm. Since hypochlorous acid is decomposed into chlorine and oxygen by ultraviolet rays and volatilized, when hypochlorous acid water is used as the sterilization solution S1, the chemical tank 10 is made of a well-known material that does not transmit ultraviolet rays. Configured. Also, the predetermined sterilizing agent may be ozone. In this case, a mixed oxidant solution containing ozone, chlorine dioxide, and hypochlorous acid is used as the disinfecting solution S1. It should be noted that there is no intention to limit the prescribed sterilizing agent to these, and any type of sterilizing agent can be used as long as it can sterilize viruses and the like floating in space or adhering to the surface of objects. In addition, in order to prevent the water contained in the sterilization solution S1 from causing rust, the chemical liquid tank 10 is made of a material that does not contain metal.

The sprayer 20 includes a nozzle 21 that ejects the sterilizing solution S1 into a space, a pump 22 that sucks up and pumps the sterilizing solution S1 stored in the chemical tank 10, a flow path 23 that connects the nozzle 21 and the pump 22, Consists of The pump 22 is electrically connected to the controller 60 and its operation is controlled by the controller 60 .

The agitator 30 has an impeller 31 arranged so as to be submerged in the sterilization solution S1, one end 32a of which is connected to the impeller 31, and the other end 32b of which is substantially perpendicular to the liquid surface S2 of the sterilization solution S1. and a drive shaft 32 extending in the direction of In FIG. 1, the impeller 31 is not submerged in the sterilization solution S1 for the purpose of explaining the configuration of the sterilization device 1. However, in the actual usage of the sterilization device 1, the impeller 31 is It is arranged so as to be submerged in the bacterial solution S1. Here, in this embodiment, the impeller 31 is provided with four blades, and the sterilization solution S1 stored in the chemical liquid tank 10 is agitated by these blades.

The electric motor 40 is a known motor and includes a motor body 41 and an output shaft 42 . Here, the electric motor 40 is electrically connected to the controller 60 and its operation is controlled by the controller 60 . Further, in this embodiment, the output shaft 42 of the electric motor 40 and the drive shaft 32 of the stirrer 30 are coaxially arranged and connected via a well-known coupling 340 . As a result, the impeller 31 of the stirrer 30 rotates about the central axis of the drive shaft 32 .

Sensor 50 is a known liquid level sensor and is electrically connected to controller 60 . Based on the output current from the sensor 50, the liquid level of the sterilizing solution S1 stored in the chemical liquid tank 10 is detected.

The controller 60 is a control device for controlling the driving of the pump 22, the electric motor 40, and the like, and has an electronic control unit composed of a CPU, a RAM, a ROM, and the like. The CPU is an arithmetic processing unit and executes each process described later. The RAM is a memory in which programs executed by the CPU and data used by the control program are developed. The ROM is a device that stores programs executed by the CPU and data used by the control program.

In the sterilization device 1 configured as described above, the blades of the impeller 31 of the stirrer 30 have a predetermined angle with respect to the liquid surface S2 of the sterilization solution S1 stored in the chemical liquid tank 10 . Here, FIG. 2 is for explaining the geometric relationship between the blades of the impeller 31 of the stirrer 30 and the liquid surface S2 of the sterilizing solution S1 stored in the chemical liquid tank 10 in this embodiment. It is a diagram.

2, it can be seen that the blades of the impeller 31 of the stirrer 30 have an angle of 45° with respect to the liquid surface S2 of the sterilizing solution S1 stored in the chemical liquid tank 10. FIG. According to this, the sterilization solution S1 stored in the chemical liquid tank 10 can be suitably stirred, and the occurrence of uneven mixing of the sterilization agent and the dilution water in the sterilization solution S1 can be suppressed as much as possible. be. Note that there is no intention to limit the predetermined angle to 45°, and it may be in the range of 20° to 70°, for example.

The sterilization device 1 described above is used, for example, together with an air conditioner. FIG. 3 is a first diagram for explaining how the sterilization device 1 according to this embodiment is used. In this case, as shown in FIG. 3, the nozzle 21 of the sprayer 20 of the sterilization device 1 is provided in the vicinity of the outlet 110 of the air conditioner 100 . Then, the sterilization solution jetted from the nozzle 21 is spread in the space by the wind from the jet port 110. - 特許庁The nozzle 21 of the sprayer 20 of the sterilization device 1 may be arranged at a position where the sterilizing solution to be ejected can be placed on the air from the outlet 110 of the air conditioner 100. may be made variable.

In such a mode of use, the controller 60 drives the electric motor 40 for a certain period of time (for example, about 1 minute), and causes the stirrer 30 to stir the sterilizing solution S1 stored in the chemical tank 10 . The controller 60 then executes this process, for example, once every 10 minutes.

Also, the controller 60 may control the operation of the pump 22 of the sprayer 20 according to the air volume from the outlet 110 of the air conditioner 100 . In this case, the controller 60 may control the operation of the pump 22 so that the amount of the sterilizing solution S1 pressure-fed by the pump 22 increases as the air volume from the outlet 110 of the air conditioner 100 increases.

Here, FIG. 3 illustrates an example in which the sterilization device 1 is used together with the air conditioner 100, but the sterilization device 1 may be used together with an air purifier, a humidifier, a fan heater, or a blower such as an electric fan. . Even when the sterilization device 1 is used with these devices, the nozzle 21 of the sprayer 20 of the sterilization device 1 is positioned so that the jetted sterilization solution can be placed on the air stream from these devices. In the above description, an example in which the sterilization solution pressure-fed by the pump 22 is ejected from the nozzle 21 has been described, but the sprayer 20 disclosed in the present application is not limited to this. For example, the sprayer 20 disclosed herein may include an ultrasonic generator and atomize the disinfecting solution using ultrasonic waves from the ultrasonic generator to spray the disinfecting solution.

Further, the sterilization device 1 may be used to sterilize the interior space of an automobile. In this case, the sterilizing solution may be sprayed into the air flow path between the air intake of the vehicle air conditioner and the outlet to the interior of the vehicle. Then, the sterilizing solution is spread in the vehicle interior space by the wind from the blowout port.

FIG. 4 is a second diagram for explaining how the sterilization device 1 according to this embodiment is used. In the mode of use shown in FIG. 4, the sterilization solution discharged from the pump 22 of the sprayer 20 of the sterilization device 1 is mixed with tap water from the faucet 200 and supplied to the flow path 23 . Specifically, faucet 200 and hose 220 are connected via coupling 210 , and hose 220 is connected to valve 230 arranged in channel 23 . In such a usage mode, hypochlorous acid water with a relatively high effective chlorine concentration (for example, 100 ppm) is stored in the chemical tank 10, and this hypochlorous acid water is diluted and mixed with tap water to create a space. can be sprayed on

According to the sterilization device 1 described above, the occurrence of uneven mixing of the sterilization agent and the dilution water in the sterilization solution S1 stored in the chemical liquid tank 10 is suppressed as much as possible. By spraying the sterilization solution from the sterilization device 1, it is possible to suitably sterilize viruses and the like floating in space.

In addition, in the sterilization device 1 disclosed in the present application, the sterilization solution S1 stored in the chemical liquid tank 10 may be mixed with a deodorizing solution (for example, aroma oil). In this case, the agitator 30 suitably mixes the sterilizing agent, the diluted water, and the deodorizing solution. By spraying a sterilizing solution containing a deodorizing solution from the sterilizing device 1, viruses and the like floating in the space can be suitably sterilized, and the space can be deodorized and deodorized.

<Modification of First Embodiment>
Modifications of the first embodiment will be described with reference to FIGS. 5 to 7. FIG. FIG. 5 is a first diagram for explaining how the sterilization device 1 according to this modification is used. In the mode of use shown in FIG. 5, the nozzle 21 of the sprayer 20 of the sterilization device 1 is arranged above the automatic door. According to this, an air curtain containing the sterilizing solution sprayed from the nozzle 21 is formed in the vicinity of the automatic door, and the doorway space of the store or the like where the automatic door is installed is sterilized. An air curtain containing such a disinfecting solution may be formed near the doorway of a vehicle or near the door or window of a building.

In the mode of use shown in FIG. 5, the spraying of the sterilizing solution from the sprayer 20 of the sterilizing device 1 may be controlled based on the opening/closing status of the automatic door. In this case, the controller 60 may control the operation of the pump 22 of the sprayer 20 by receiving an output signal from a human sensor included in the automatic door. For example, the controller 60 controls the operation of the pump 22 so that a relatively small amount of disinfecting solution is sprayed from the nozzle 21 when a human is not detected by the human sensor, and the human is detected by the human sensor. The operation of the pump 22 can be controlled so that a relatively large amount of disinfecting solution is sprayed from the nozzle 21 when the spray is applied.

FIG. 6 is a second diagram for explaining how the sterilization device 1 according to this modification is used. In the usage mode shown in FIG. 6, an air curtain containing the disinfecting solution sprayed from the nozzle 21 of the sprayer 20 of the disinfecting device 1 is formed in the space between the first automatic door and the second automatic door. . In this case, the nozzle 21 of the sprayer 20 of the sterilization device 1 is arranged, for example, on the ceiling of the above space. According to this, the space between the first automatic door and the second automatic door is sterilized.

Also at this time, the spraying of the sterilization solution from the sprayer 20 of the sterilization device 1 may be controlled based on the opening/closing status of the automatic door. Specifically, when the controller 60 receives an output signal from the human sensor of either the first automatic door or the second automatic door, the pump 22 sprays the disinfecting solution from the nozzle 21. is driven, and when an output signal from the human sensor of the other automatic door is received thereafter, driving of the pump 22 may be terminated.

Also, FIG. 7 is a third diagram for explaining the mode of use of the sterilization device 1 according to this modified example. In the mode of use shown in FIG. 7, an air curtain containing the sterilizing solution sprayed from the nozzle 21 of the sprayer 20 of the sterilizing device 1 is formed toward the products arranged on the product display shelf. According to this, the products arranged on the product display shelf are sterilized.

In the sterilization apparatus 1 described above, similarly to the first embodiment described above, the sterilization solution S1 stored in the chemical liquid tank 10 is stirred by the stirrer 30, and is stored in the chemical liquid tank 10. In the sterilizing solution S1, the occurrence of uneven mixing of the sterilizing agent and the dilution water is suppressed as much as possible. By spraying the sterilization solution from the sterilization device 1, it is possible to suitably sterilize viruses and the like floating in space or adhering to the surfaces of objects.

<Second embodiment>
A second embodiment will be described with reference to FIGS. 8 and 9. FIG. FIG. 8 is a diagram showing a schematic configuration of a sterilization device according to this embodiment. In the first embodiment described above, the impeller 31 and the drive shaft 32 of the stirrer 30 are coupled to one end 32a of the drive shaft 32 so that the impeller 31 and the drive shaft 32 perform the same rotational motion. The output shaft 42 and the drive shaft 32 of the agitator 30 are arranged coaxially. As a result, the impeller 31 of the stirrer 30 rotates about the central axis of the drive shaft 32 . On the other hand, in the present embodiment, the impeller 31 of the agitator 30 and one end of the drive shaft 32 are mounted via a bearing 33 so that the impeller 31 of the agitator 30 rotates relative to the drive shaft 32 . 32a are connected. In this embodiment, as shown in FIG. 8, the output shaft 42 of the electric motor 40 and the drive shaft 32 of the stirrer 30 are connected via a converter 350 . Then, the rotary motion output from the electric motor 40 is converted into linear motion and transmitted to the drive shaft 32 of the stirrer 30 . The converter 350 that converts rotary motion into linear motion is, for example, a ball screw.

Here, FIG. 9 is a diagram for explaining movements of the impeller 31 and the drive shaft 32 of the stirrer 30 in this embodiment. As described above, the rotary motion output from the electric motor 40 is converted into linear motion by the converter 350 and transmitted to the drive shaft 32 of the stirrer 30 . Therefore, the drive shaft 32 of the stirrer 30 linearly moves in a substantially vertical direction with respect to the liquid surface S2 of the sterilization solution S1. Then, the impeller 31 connected to the one end 32 a of the drive shaft 32 via the bearing 33 also moves together with the drive shaft 32 . Here, as described above, the blades of the impeller 31 have a predetermined angle with respect to the liquid surface S2 of the disinfecting solution S1. Therefore, when the impeller 31 moves integrally with the drive shaft 32, the blades of the impeller 31 receive drag from the sterilization solution S1. Also, the impeller 31 is connected via a bearing 33 so as to rotate relative to the drive shaft 32 . In view of the above, the impeller 31 rotates relative to the drive shaft 32 while moving integrally with the drive shaft 32 . According to this, the sterilization solution S1 stored in the chemical liquid tank 10 can be suitably stirred, and the occurrence of uneven mixing of the sterilization agent and the dilution water in the sterilization solution S1 can be suppressed as much as possible. be.

In such a sterilization device 1, the controller 60 keeps the sterilization solution S1 on the impeller 31 even when the impeller 31 of the stirrer 30 moves in a substantially vertical direction with respect to the liquid surface S2 of the sterilization solution S1. The driving of the electric motor 40 may be controlled based on the liquid level S2 of the sterilizing solution S1 detected by the sensor 50 so that the submerged state is maintained.

In the sterilization apparatus 1 described above, as described above, the sterilization solution S1 stored in the chemical tank 10 is stirred by the stirrer 30, so that the sterilization solution S1 stored in the chemical tank 10 The occurrence of uneven mixing of the sterilizing agent and the dilution water is suppressed as much as possible. By spraying the sterilization solution from the sterilization device 1, it is possible to suitably sterilize viruses and the like floating in space or adhering to the surfaces of objects.

<Third Embodiment>
A third embodiment will be described with reference to FIG. FIG. 10 is a diagram showing a schematic configuration of a sterilization device according to this embodiment. In the sterilization device 1 according to the present embodiment, the stirrer 30 and the first link portion 34 configured to be movable in a substantially vertical direction with respect to the liquid surface S2 of the sterilization solution S1 stored in the chemical liquid tank 10. and a second link portion 35 that connects the first link portion 34 and the blades of the impeller 31 to transmit the motion of the first link portion 34 to the blades of the impeller 31 . In addition, in the sterilization apparatus 1 according to the present embodiment, the electric motor includes the first electric motor 410 that drives the agitator 30 and the second electric motor 420 that drives the first link portion 34, and the controller 60 controls the driving of the first electric motor 410 and the driving of the second electric motor 420 .

According to such a configuration, the motion of the first link portion 34 transmitted to the blades of the impeller 31 via the second link portion 35 causes the sterilization solution S1 stored in the chemical solution tank 10 to move toward the liquid surface S2. The angle of the blades of the impeller 31 can be changed. Specifically, the blades of the impeller 31 are configured to be rotatable around the shaft 36, and the second link portion 35 connected to the blades of the impeller 31 on the side opposite to the shaft 36 is arranged. When moved, the angle of the blades of the impeller 31 will be changed.

Here, the first link portion 34 is held by the drive shaft 32 via a linear motion bearing 37 and is configured to be linearly movable along the drive shaft 32 . By the second electric motor 420, the converter 39 that converts the rotary motion of the output shaft 422 of the second electric motor 420 into linear motion, and the transmission shaft 38 that transmits the output of the converter 39 to the first link portion 34, , the first link portion 34 is driven.

The controller 60 can control the drive of the second electric motor 420 based on the liquid level S2 of the sterilizing solution S1 detected by the sensor 50. FIG. According to this, the controller 60 controls the second electric motor 420 so that, for example, the lower the liquid level S2 of the sterilizing solution S1, the smaller the angle of the blades of the impeller 31 with respect to the liquid level S2 of the sterilizing solution S1. Drive may be controlled. Then, the sterilizing solution can be suitably stirred according to the liquid surface S2 of the sterilizing solution S1.

In the sterilization apparatus 1 described above, as described above, the sterilization solution S1 stored in the chemical tank 10 is stirred by the stirrer 30, so that the sterilization solution S1 stored in the chemical tank 10 The occurrence of uneven mixing of the sterilizing agent and the dilution water is suppressed as much as possible. By spraying the sterilization solution from the sterilization device 1, it is possible to suitably sterilize viruses and the like floating in space or adhering to the surfaces of objects.

DESCRIPTION OF SYMBOLS 1... Sterilization apparatus 10... Chemical liquid tank 20... Sprayer 30... Stirrer 31... Impeller 32... Drive shaft 32a... One end 32b. ..Other end 40..Electric motor 50..Sensor 60..Controller

Claims (5)

a chemical liquid tank for storing a sterilization solution containing a predetermined sterilization agent;
a sprayer for spraying the sterilization solution stored in the chemical tank;
a sensor that detects the liquid level of the sterilization solution stored in the chemical tank;
A stirrer for stirring the sterilization solution stored in the chemical solution tank, comprising an impeller disposed so as to be submerged in the sterilization solution, one end of which is connected to the impeller and the other end of which is connected to the impeller. an agitator having a drive shaft extending in a substantially vertical direction with respect to the liquid surface of the disinfecting solution;
an electric motor that drives the stirrer by being connected to the drive shaft via a predetermined coupling;
a controller that controls driving of the electric motor;
with
The blades of the impeller have a predetermined angle with respect to the liquid surface of the sterilization solution stored in the chemical tank,
sterilization device. the agitator is coupled to the impeller and the one end of the drive shaft so that the impeller and the drive shaft perform the same rotational motion;
the output shaft of the electric motor and the drive shaft of the stirrer are arranged coaxially;
The sterilization device according to claim 1. The agitator has the impeller and the one end of the drive shaft connected via a predetermined bearing so that the impeller rotates relative to the drive shaft,
The rotary motion output from the electric motor is converted into linear motion via a predetermined converter and transmitted to the drive shaft of the agitator.
The sterilization device according to claim 1. The stirrer includes a first link portion configured to be movable in a substantially vertical direction with respect to the liquid surface of the sterilization solution stored in the chemical liquid tank, and the first link portion and the blade of the impeller. and a second link portion that transmits the motion of the first link portion to the blades of the impeller by connecting the second link portion that is transmitted to the blades of the impeller via the second link portion. The angle of the blades of the impeller with respect to the liquid surface of the sterilizing solution stored in the chemical tank can be changed by the movement of the 1 link part,
The electric motor includes a first electric motor that drives the stirrer and a second electric motor that drives the first link portion,
The controller controls driving of the first electric motor and controls driving of the second electric motor.
The sterilization device according to any one of claims 1 to 3. The controller controls driving of the second electric motor based on the level of the sterilizing solution detected by the sensor.
The sterilization device according to claim 4.

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