JP2019092922A - Sanitization method and sanitization device - Google Patents

Abstract

To provide a sanitization method and a sanitization device which can sanitize effectively in large space.SOLUTION: A revolving mechanism unit 30 is attached to an upper end of a pole 20 of a sanitization device 10. On the revolving mechanism unit 30, a two-fluid nozzle 35 is fixed via a mounting member 31. The two-fluid nozzle 35 sprays a medicinal solution for spraying time from a spraying spout 35a by feeding compressed air and liquid. After the spraying, the revolving mechanism unit 30 revolves to revolve the two-fluid nozzle 35 to other spraying direction in a horizontal plane, and then the medicinal solution is sprayed in the spraying direction in a spray condition fixed previously.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sterilization method and a sterilization apparatus in which sterilization is performed by spraying a chemical solution.

  Techniques for sterilization are examined by spraying chemicals such as hypochlorous acid aqueous solution which has a sterilizing effect inside food manufacturing facilities such as food factories and facilities of medical and welfare facilities (for example, patent documents 1). This Patent Document 1 describes that sterilization can be performed by spraying a chemical solution from a two-fluid nozzle into an indoor space so that the relative humidity after spraying is 70% or more. Furthermore, this document describes that when the relative humidity of the indoor space before spraying is low, the chemical solution is sprayed after being humidified by a humidifier.

JP, 2016-27849, A

  However, in a large space, the sprayed chemical solution may be diffused, which may make it difficult to increase the relative humidity in the space. Moreover, when the spraying direction of a two fluid nozzle is being fixed, it may be difficult to spray a chemical | medical solution to the whole space.

  The sterilizing method to solve the above-mentioned problems is a sterilizing method of sterilizing the inside of the space by spraying the chemical solution from the spray port of the two-fluid nozzle supplied with the chemical solution and the gas, and a plurality of sprays in the horizontal plane In the direction, the spray nozzle is directed sequentially to spray the chemical solution under predetermined spray conditions.

  According to the present invention, sterilization can be efficiently performed in a wide space.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram explaining the structure of the sterilization apparatus in embodiment. Explanatory drawing of a structure of the control unit of the sterilization apparatus in embodiment. The flowchart explaining the process sequence of the sterilization process in embodiment. The flowchart explaining the processing procedure of the spraying process of the chemical | medical solution in embodiment. The arrangement | positioning figure in the space explaining the disinfection process in embodiment. It is an explanatory view of a check test of a relation of a spraying direction of two fluid nozzles and relative humidity in an embodiment, and (a) is a top view of measurement arrangement, (b) is a side view of measurement arrangement. The graph which shows the relationship of the elapsed time and relative humidity in the test method of FIG. It is a graph which shows the relationship of the elapsed time and relative humidity in the test method of FIG. 6, Comprising: (a) is relative humidity in the 1st position at the time of fixing a nozzle, (b) is a 2nd at the time of fixing a nozzle Relative humidity at position, (c) Relative humidity when nozzle is rotated.

Hereinafter, an embodiment in which the sterilization apparatus and the sterilization method are embodied will be described with reference to FIGS. 1 to 8.
The sterilizer 10 shown in FIG. 1 is equipped with the housing 11 of rectangular solid shape. Four drive wheels 15 are rotatably attached to the bottom of the housing 11. The sterilization device 10 is movable by the drive wheel 15.

A circular hole at the center and an opening on one side in the longitudinal direction are formed on the top surface of the housing 11. The pole 20 passes through the circular hole. In the opening, a lid 12 is attached so as to be openable and closable.
In the housing 11, the water tank 21 and the chemical solution tank 22 are arranged side by side at a position below the lid 12. The water tank 21 and the chemical solution tank 22 are containers with a lid.

The water tank 21 stores water to be sprayed when the humidity is low at the start of sterilization.
The drug solution tank 22 stores a drug solution used for sterilization. As this chemical | medical solution, when disinfecting a living room, pH is 6.5 and a hypochlorous acid density | concentration uses a chemical | medical solution of 120 mg / L. This solution is prepared by diluting sodium hypochlorite 6% with tap water and then adjusting the pH by adding 3% hydrochloric acid as a food additive. In addition, using Purax (registered trademark) S as sodium hypochlorite 6%, tap water: Purax S; salt additive 3% hydrochloric acid is mixed at a ratio of 650: 1: 1. Moreover, when removing mold, the hypochlorous acid concentration of the chemical solution to be sprayed is increased. For example, a solution obtained by diluting 6% of sodium hypochlorite with tap water to 0.3 to 0.5% is used.

  The water tank 21 and the chemical solution tank 22 are placed on weighing scales 23 and 24, respectively. The weighing scales 23 and 24 are used to grasp the remaining amount of water in the water tank 21 and the chemical solution in the chemical solution tank 22.

  A water supply pipe 21a and a chemical liquid supply pipe 22a are provided at lower end portions of the water tank 21 and the chemical liquid tank 22, respectively. The water supply pipe 21 a and the chemical liquid supply pipe 22 a are connected to the liquid switching valve 25. The liquid switching valve 25 is connected to a two-fluid nozzle 35 described later via a flexible liquid supply pipe 26 (only a part of which is shown in the figure). The liquid switching valve 25 switches the connection between the water supply pipe 21 a or the chemical liquid supply pipe 22 a and the liquid supply pipe 26 to supply water or a chemical liquid to the two-fluid nozzle 35.

Further, a gas control unit 27 and an electric control unit 28 are disposed in the housing 11.
The gas control unit 27 incorporates a compressor and a gas supply valve. A compressor for compressing air is connected to the gas supply valve. The gas supply valve is connected to the two-fluid nozzle 35 via a flexible gas supply pipe (not shown). The gas supply valve connects or disconnects the compressor and the two-fluid nozzle 35.

  The electric control unit 28 incorporates a control unit, a battery, and the like described later. Further, the electric control unit 28 incorporates a moving mechanism unit for driving the drive wheel 15 for moving the sterilization apparatus 10.

  The lower portion of the pole 20 as a support is fixed in the housing 11. The upper portion of the pole 20 projects upward from the circular hole on the top surface of the housing 11. The pole 20 is formed by nesting a plurality of cylindrical bodies having different diameters, and is extensible and contractible in the vertical direction. For example, when spraying in a high space such as a ceiling, the pole 20 is extended. At the upper end of the pole 20, a turning mechanism 30 as a rotation mechanism is provided. The rotation mechanism unit 30 includes a rotation table 30a, and rotates the rotation table 30a half turn (rotation) in forward and reverse directions in a horizontal plane centering on a vertical axis.

  A mounting member 31 is mounted on the rotary table 30 a of the rotation mechanism 30. The mounting member 31 is formed in a U-shape by bending a plate-like member. The two-fluid nozzle 35 is fixed to the upper surface of the bottom of the mounting member 31. Further, on the upper surface of the upper portion of the mounting member 31, a camera 33 for photographing the outer periphery is mounted. The camera 33 is used to capture an image of the periphery of the sterilization apparatus 10.

  The two-fluid nozzle 35 ejects the liquid in a mist using compressed air. The two-fluid nozzle 35 has a compressed air intake portion 37 and a liquid intake portion 38, and is connected to the gas supply pipe and the liquid supply pipe 26, respectively.

  In the present embodiment, a two-fluid siphon spray nozzle is used as the two-fluid nozzle 35. Specifically, Quick Fogger (trade name) manufactured by Spraying Systems Japan Ltd. is used. The two-fluid nozzle 35 can control the amount of spray liquid per hour of the two-fluid nozzle 35 by the air pressure of the compressed air supplied. The two-fluid nozzle 35 of the present embodiment has two spray ports 35 a at the front and back. The spray ports 35 a are disposed on the opposite side so as to face each other, and are directed to the open surfaces (each side surface of the U-shape) of the mounting member 31. Moreover, the spray nozzle 35a of this embodiment sprays mist having a particle diameter of 9 to 11 μm.

<Configuration of control unit>
Next, the configuration of the control unit 50 provided in the sterilization apparatus 10 will be described with reference to FIG. In the present embodiment, the control unit 50 is realized by the gas control unit 27 and the electric control unit 28.

  The control unit 50 is connected to the camera 33 and the humidity measuring unit M1. The control unit 50 acquires a photographed image from the camera 33. The control unit 50 acquires a humidity measurement signal from the humidity measurement unit M1 by wireless communication.

  The control unit 50 is connected to a remote control unit including the operation unit 55 and the display unit 56 by wireless communication. The operation unit 55 is used to perform a sterilization start instruction, change operation of chemical solution spray start humidity, and the like by remote control. The display unit 56 is configured by a display, and displays the humidity of the humidity measurement unit M1, an image of the camera 33, and the like.

The control unit 50 controls the liquid switching valve 25, the gas supply valve V 1 and the compressor C 1 in the gas control unit 27, the rotation mechanism unit 30, and the moving mechanism unit W 1 in the electric control unit 28.
The control unit 50 includes a sterilization control unit 51, a spray control unit 52, and a system timer.

  The sterilization management unit 51 controls the process of specifying the spray range, the humidification process, and the transfer process. For this reason, the sterilization control unit 51 stores data on the spray range identification program and the chemical solution spray start humidity.

The spray range specification program is a program for specifying a spray exclusion area from the image acquired from the camera 33 and specifying a spray planned area.
The chemical solution spraying start humidity is a humidity to determine the necessity of the humidification, and in the present embodiment, for example, 60% RH is used.

Furthermore, the sterilization management unit 51 stores data on the movement direction and movement interval amount (for example, 5 m) of the sterilization device 10. Here, the movement direction is determined and stored before the start of sterilization based on the size and shape of the space to be sterilized.
The spray control unit 52 executes a chemical solution spray process. For this reason, the spray control unit 52 stores data on the plurality of spray directions of the spray port 35a and the spray time in each spray direction.

  As shown in FIG. 5, in the present embodiment, spraying is performed in three directions of the lateral direction (0 degree) of the housing 11 and the direction of ± 45 degrees with respect to the plurality of spraying directions. In this case, spraying is performed for the same spraying time in all spraying directions. As the spraying time, a time (for example, 15 minutes) which is 4 m away from the two-fluid nozzle 35 and becomes higher than the target relative humidity (70% RH) at a position spaced 0.25 m from the spraying direction is used.

<Method of sterilization>
Next, the sterilization method by the sterilization apparatus 10 of this embodiment is demonstrated using FIGS. 3-5.

  In this embodiment, it is assumed that the room R1 of the large space shown in FIG. 5 is disinfected. In this case, the sterilization apparatus 10 disinfects the entire room R1 while moving for each movement direction and movement interval amount determined before the start of sterilization. In the present embodiment, a plurality of humidity measurement units M1 are disposed apart from each other on the outer peripheral surface of the room R1. Each humidity measurement unit M1 measures the temperature and humidity of the room R1, detects relative humidity, and transmits the detected relative speed to the control unit 50. Furthermore, in the room R1, an obstacle B1 that dislikes high humidity such as an electric device is disposed.

(Elimination treatment)
When sterilization of the room R1 is started, the sterilization apparatus 10 is disposed in the room R1, and the door D1 of the room R1 is closed to close the room R1. Then, the remote control unit is used to instruct start of sterilization of the sterilization apparatus 10 from outside the room R1.

  As shown in FIG. 3, first, the control unit 50 executes a process of specifying a spray area (step S1-1). Here, the control unit 50 specifies the spray area based on the presence or absence of an obstacle. Details of this process will be described later.

  Next, the control unit 50 executes an acquisition process of the start humidity (step S1-2). Specifically, the sterilization management unit 51 of the control unit 50 acquires the relative humidity of the humidity measurement unit M1 in the range where the humidity rises according to the position of the sterilization apparatus 10. As shown in FIG. 5, when the sterilization apparatus 10 is disposed at the position P1, the relative humidity from the humidity measurement unit M1 located in the sterilization target section A1 is acquired.

  Then, the control unit 50 executes a process of determining whether the humidity is higher than the chemical solution spraying start humidity (step S1-3). Specifically, the sterilization control unit 51 of the control unit 50 determines whether or not the acquired relative humidity is equal to or higher than the chemical solution spraying start humidity (60% RH). If the humidity measured by the plurality of humidity measurement units M1 is different, the bacteria removal management unit 51 calculates a statistical value (for example, an average value) of the humidity, and whether the statistical value is equal to or higher than the chemical solution start humidity Determine

  Here, if the relative humidity is lower than the chemical solution spraying start humidity (in the case of “NO” in step S1-3), the control unit 50 executes a water spray process (step S1-4). Specifically, the sterilization management unit 51 of the control unit 50 controls the liquid switching valve 25 to connect the water supply pipe 21a and the liquid supply pipe 26, and the water from the water tank 21 to the two-fluid nozzle 35 Supply. Furthermore, the sterilization control unit 51 activates the compressor C1, opens the gas supply valve V1, and supplies compressed air to the two-fluid nozzle 35. Thus, water is sprayed from the two-fluid nozzle 35 to humidify the inside of the room R1, and the humidity of the room R1 is increased. In addition, in the spraying process of this water, it raises only to chemical | medical solution spray start humidity (60% RH). Since the humidity is relatively low, the control unit 50 does not drive the pivot mechanism 30, and the two-fluid nozzle 35 sprays water with the spray direction fixed. And spraying of water is continued until the relative humidity from humidity measurement part M1 becomes more than chemical | medical solution spraying start humidity.

Next, the control unit 50 executes a spray process of the chemical solution (step S1-5). Details of this process will be described later.
When the spraying process of the chemical solution at this place is completed, the control unit 50 executes a process of determining whether or not the sterilization is completed (step S1-6). Specifically, the sterilization control unit 51 of the control unit 50 determines that the sterilization is not completed when the space not yet disinfected remains.

In this case (in the case of “NO” in step S1-6), the control unit 50 executes the movement process (step S1-7). Specifically, the sterilization control unit 51 of the control unit 50 drives the moving mechanism unit W1 to move the sterilization apparatus 10 by the movement interval amount in the movement direction. For example, the sterilization apparatus 10 sequentially moves in the direction of the arrow shown in FIG. And after moving, control unit 50 performs processing after step S1-1.
On the other hand, when the control unit 50 determines that the sterilization of the entire room R1 has been completed (in the case of “YES” in step S1-6), the sterilization processing is ended.

(Specific processing of spray area)
Next, the details of the above-described spray area identification process (step S1-1) will be described using FIG.

First, the bacteria removal management unit 51 of the control unit 50 uses the distance of the subject included in the captured image of the camera 33 and the angle of the rotary table 30a at the time of shooting to determine whether there is an obstacle around the current position. Make a decision on In this case, the obstacle may be identified by image recognition.
Here, when it is determined that there is no obstacle, the sterilization control unit 51 sprays in all spraying directions. For example, it is assumed that there is an obstacle B1 in the room R1 of FIG. In this case, when the sterilization apparatus 10 is at the position P1, since there is no obstacle B1 in the sterilization target compartment A1, all of the sterilization target compartment A1 is set as a spray scheduled area, and spraying is performed in all spraying directions. Do.

  On the other hand, when it is determined that there is an obstacle, the bacteria removal management unit 51 specifies the direction and distance of the obstacle from the image. Then, when it is determined that the obstacle is located in the sterilization target compartment, the sterilization management unit 51 sets the spray direction to the obstacle as the spray exclusion area. Then, the sterilization control unit 51 specifies the spray direction corresponding to the spray planned area excluding the spray excluded area.

  For example, in FIG. 5, when the sterilization apparatus 10 is moved to the position P3, the obstacle B1 is included in the sterilization target section A3 at the position P3 of the movement destination. For this reason, the sterilization control unit 51 specifies the spray direction in which the obstacle B1 is present as the spray exclusion area. Then, the control unit 50 of the sterilization apparatus 10 defines a spray scheduled area other than the spray excluded area, and identifies the spray direction corresponding to this.

(Spray treatment of chemical solution)
Next, the spray process (step S1-5) of a chemical | medical solution is demonstrated using FIG.4 and FIG.5.
The control unit 50 executes the spray process (step S2-1). Specifically, the spray control unit 52 of the control unit 50 connects the liquid chemical tank 22 and the liquid supply pipe 26 by switching operation of the liquid switching valve 25 and supplies the liquid chemical to the two-fluid nozzle 35. In addition, when the water spray process (step S1-4) is skipped and compressed air is not supplied to the two-fluid nozzle 35, the spray control unit 52 starts the compressor C1 and switches the gas supply valve V1. Then, compressed air is also supplied to the two-fluid nozzle 35.

  Thus, the chemical solution and the compressed air are supplied to the two-fluid nozzle 35, and the chemical solution is sprayed from the spray port 35 a of the two-fluid nozzle 35. And relative humidity of room R1 rises by spraying of a medical fluid.

  Next, the control unit 50 executes a determination process as to whether or not the estimated spraying time has elapsed (step S2-2). Specifically, the spray control unit 52 of the control unit 50 measures the elapsed time from the start of spraying based on the system timer, and compares the elapsed time with the estimated spray time. Here, when the spray scheduled time has not passed (in the case of “NO” in step S2-2), the spray control unit 52 continues to spray the chemical solution.

  On the other hand, when the elapsed time has exceeded the spraying scheduled time (in the case of "YES" in step S2-2), the control unit 50 executes a process of determining whether or not spraying in all directions has ended (step S2-). 3). Specifically, at this point, the spray control unit 52 of the control unit 50 determines whether or not spraying has been performed for all the spray directions in the spray scheduled area.

  If it is determined that there is a non-spray direction in the spray scheduled area and spraying in all directions has not ended (in the case of "NO" in step S2-3), the control unit 50 rotates the two-fluid nozzle. Execute (step 2-4). Specifically, the spray control unit 52 of the control unit 50 drives the rotation mechanism unit 30 to rotate the two-fluid nozzle 35 in the non-spraying direction. And the process after a spraying process (step S2-1) is repeatedly performed by this spraying direction.

  On the other hand, when it is determined that the spraying in all directions is completed (in the case of “YES” in step S2-3), the control unit 50 executes the spray stop process (step S2-5). Specifically, the spray control unit 52 of the control unit 50 stops the supply of the compressed air to the two-fluid nozzle 35 by switching the gas supply valve V1 and stopping the compressor C1. Thus, the spraying from the two-fluid nozzle 35 is completed.

<Experiment of humidity rise to the spraying direction of two fluid nozzle>
The above-mentioned sterilization method is carried out based on findings based on the following spray experiments. In the following experiment, the rising change of relative humidity is experimented by spraying water instead of chemical solution spraying.

6 (a) and 6 (b) show a plan view and a side view of the test apparatus.
Here, as shown in FIG. 6, the two-fluid nozzle 65 is fixed on the rotating table 60. In this case, the spray port 65a of the two-fluid nozzle 65 is disposed at a height of 40 cm from the floor surface. Then, temperature / humidity loggers Ma1, Ma2, Ma3 and Ma4 are arranged at intervals of 1 m from the two-fluid nozzle 65 on a line L1 connecting the two spray ports 65a of the two-fluid nozzle 65. That is, the temperature and humidity loggers Ma1 to Ma4 are disposed at positions of 1 m, 2 m, 3 m, and 4 m from the center of the two-fluid nozzle 65, respectively. Further, as shown in FIG. 6A, the temperature and humidity loggers Mb1, Mb2, Mb3, and Mb4 are disposed at positions corresponding to the temperature and humidity loggers Ma1 to Ma4 apart from the line L1 by 0.25 m. Further, temperature / humidity loggers Mc1, Mc2, Mc3, Mc4 are disposed at positions corresponding to the temperature / humidity loggers Ma1 to Ma4 separated from the line L1 by 1 m.

  The two-fluid nozzle 65 used in this experiment is a nozzle manufactured by Spraying Co., and a nozzle tip (4.5N) is attached, and a nozzle for spraying a mist having a mist diameter of 9 to 11 μm was used. In addition, the mist was sprayed at 100 ml / min.

FIG. 7 is a diagram showing changes in relative humidity of the temperature / humidity loggers Ma1 to Ma4 on the line L1 when the spray direction of the nozzle is not changed.
Moreover, FIG. 8A is a diagram showing a change in relative humidity of the temperature and humidity loggers Mb1 to Mb4 at a position of 0.25 m from the line L1 when the spray direction of the nozzle is not changed. Further, FIG. 8B is a diagram showing changes in relative humidity of the temperature and humidity loggers Mc1 to Mc4 located at a position 1 m from the line L1 when the spray direction of the nozzle is not changed.

  As shown in FIG. 7, in the spray direction (on line L1), even at a position 4 m away from the two-fluid nozzle 65, the relative humidity exceeded 70% in about 6 minutes from the start of the spray. Moreover, as shown to Fig.8 (a), although the time required near 30 minutes also in the place 0.25 m away from the spraying direction, relative humidity exceeded 70%. However, as shown in FIG. 8 (b), at a location 1 m away from the spraying direction, the relative humidity did not exceed 70% even if spraying was continued for 30 minutes.

  Further, FIG. 8C shows the temperature and humidity in the spraying direction (on the line L1) when spraying is performed by repeatedly rotating the rotation table 60 half rotation (180 degrees) and half rotation (180 degrees) repeatedly in the forward and reverse directions. It is a figure which shows the change of the relative humidity of logger Ma1-Ma4. In this case, the rotational speed of the two-fluid nozzle 65 (rotary table 60) is 10 seconds / 180 degrees. As shown in this figure, the initial relative humidity is about 40%, and when the distance from the two fluid nozzle 65 is 2 m, the relative humidity exceeds 70% in about 15 minutes, but in the place 3 m or more, it is sprayed for 30 minutes But it did not exceed 70%.

  From the above experimental results, it is better to use a spraying method in which the spraying direction is changed for a fixed time and the spraying is performed again for a fixed time after spraying for a fixed time, rather than spraying in a state where the spray direction of the two fluid nozzle 65 is always fixed or always rotated The relative humidity around the two-fluid nozzle 65 can be uniformly and rapidly raised.

According to the present embodiment, the following effects can be obtained.
(1) The sterilization apparatus 10 of the present embodiment sequentially sprays the chemical solution under predetermined spraying conditions (spraying time) toward the plurality of spraying directions in the horizontal plane with the spray ports 35 a of the two-fluid nozzle 35. As a result, even in a wide space, the target humidity can be raised for each spray area, and sterilization can be performed efficiently.

  (2) The control unit 50 of the sterilization apparatus 10 of the present embodiment specifies the spray area (step S1-1). If there is an obstacle, the chemical solution is sprayed to the spray area other than the spray exclusion area. Thereby, the humidity rise to an obstacle can be suppressed.

  (3) In the present embodiment, when the start humidity is lower than the chemical solution spray humidity ("NO" in step S1-3), the control unit 50 of the sterilization apparatus 10 sprays water. This enables efficient sterilization with a small amount of chemical solution.

(4) In the present embodiment, the sterilization device 10 is moved to perform spraying after the spraying at the predetermined position is completed. Thereby, sterilization can be efficiently performed in the large room R1.
(5) In the present embodiment, the two-fluid nozzle 35 has two spray ports 35a at the front and back, and performs rotation by rotating the rotating table 30a half turn (rotation) in forward and reverse directions. Thereby, sterilization can be efficiently performed by half rotation.

  (6) In the present embodiment, the pole 20 having the two-fluid nozzle 35 attached to the upper end is expandable. For this reason, the pole 20 can be extended and sterilization can be performed at a high position such as a ceiling.

The present embodiment can be modified as follows. The present embodiment and the following modifications can be implemented in combination with one another as long as there is no technical contradiction.
In the above embodiment, the spraying time in a plurality of spraying directions in the horizontal plane is 15 minutes. The spraying time is not limited to this. Also, the time is not limited to a predetermined time. For example, the end of spraying may be determined by the relative humidity measured by a hygrometer placed in the space to be disinfected. Specifically, the spray control unit 52 of the control unit 50 stores the target humidity (for example, 70% RH) at which the spraying ends. Then, after performing the spraying process (step S2-1), the control unit 50 performs a process of determining whether or not the target humidity is reached. Specifically, the spray control unit 52 of the control unit 50 compares the detected humidity from the humidity measurement unit M1 located in the sterilization target compartment A1 with the target humidity. Then, if the detected humidity does not exceed the target humidity, the spray control unit 52 continues to spray the chemical solution. On the other hand, when the detected humidity exceeds the target humidity, the control unit 50 executes a determination process as to whether spraying in all directions is completed (step S2-3). As a result, since the spraying can be stopped while confirming the humidity in the sterilization target area, sterilization can be performed accurately and efficiently.

  In the embodiment, the control unit 50 wirelessly acquires the detected humidity of the humidity measuring unit M1 installed in the room R1. Instead of installing the humidity measurement unit M1 in the room R1, the humidity measurement unit M1 may be attached to the sterilization apparatus 10, and the measurement humidity may be acquired by wired communication. In this case, the humidity detected by the humidity measuring unit M1 attached to the sterilization apparatus 10 is corrected to predict the humidity in the sterilization target section A1.

  In the above embodiment, the control unit 50 makes the spraying time in each spraying direction the same time. The spraying time may be changed according to the spraying direction. Specifically, the space volume of the spray scheduled area is calculated, and the spray time is calculated based on this volume. For example, if there is a wall in the area to be sprayed, the spray time is shortened because the space volume is small. Thereby, according to space volume, it can spray efficiently.

  In the embodiment described above, spraying is performed in three directions of 0 and ± 45 degrees with respect to the longitudinal direction of the housing 11. The direction interval of the spray is not limited to this. Further, the spraying direction may not be equally spaced depending on the shape of the space to be sterilized and the like. Specifically, the spray direction may be determined based on the space volume in the spray direction.

  In the embodiment, the control unit 50 fixes the two-fluid nozzle 35 and sprays water in the water spray process (step S1-4). The method of spraying water is not limited to one direction, and water may be sprayed in a plurality of spraying directions as in the case of chemical liquid spray processing, and it is repeated to rotate the two-fluid nozzle 35 while spraying it. May be

  In the above embodiment, the drive wheel 15 is attached to the sterilization apparatus 10. The control unit 50 drives the driving wheel 15 to move the sterilization apparatus 10 by controlling the moving mechanism unit W1. The moving mechanism for moving the sterilization apparatus 10 is not limited to the mechanism using the drive wheel 15. For example, a moving mechanism capable of rectilinear movement and turning around a central axis, such as a Mecanum wheel or Omni wheel (registered trademark) may be used.

  In the embodiment described above, the spray ports 35 a are sequentially directed in a plurality of spray directions in the horizontal plane, and the chemical solution is sprayed for the spray time. The predetermined spraying conditions when the spray ports are directed in a plurality of spraying directions are not limited to the spraying time. For example, the angle of the spray nozzle with respect to the horizontal plane, the pressure at the time of spraying, etc. may be used.

-In the said embodiment, the image image | photographed by the camera 33 was used in order to identify a spraying scheduled area. The image captured by the camera (imaging device) may be used other than specifying the spray planned area. For example, it may be used to determine the installation height of the two-fluid nozzle 35. Specifically, the pole 20 is provided with a lifting mechanism for expanding and contracting the pole 20. The control unit 50 drives the elevating mechanism to adjust the height of the spray port 35 a of the two-fluid nozzle 35. In this case, the control unit 50 stores the movable range (movable elevation height) of the two-fluid nozzle 35 according to the expansion and contraction of the pole 20.
After identifying the obstacle in the spray area identification process (step S1-1), the control unit 50 identifies the height of the obstacle B1 using the image. Then, when the control unit 50 compares the height of the obstacle B1 with the movable elevation height and determines that the spray port 35a of the two-fluid nozzle 35 can be made higher than the obstacle B1, the spray port 35a is higher than the obstacle B1. Control the lift mechanism to be in position. Thereby, it is possible to prevent the spray mist from the spray port 35a of the two-fluid nozzle 35 from directly hitting the obstacle B1.
In addition, when spraying a chemical onto the ceiling to remove mold, the nozzle may be installed at a height at which the spray mist does not directly hit the obstacle, using the image captured by the camera 33.

  In the above embodiment, the control unit 50 moves the rotation mechanism unit 30 that rotates the two-fluid nozzle 35 and the sterilization device 10. The rotation of the two-fluid nozzle 35 and the movement of the sterilization apparatus 10 may be performed manually. Further, the chemical solution to be sprayed may be changed depending on the size of the room to be sterilized, the amount of chemical solution, and the like.

  A1: sterilization area, B1: obstacle, C1: compressor, D1: door, L1: line, M1: humidity measuring unit, Ma1, Ma2, Ma3, Ma4, Mb1, Mb2, Mb3, Mb4, Mc1, Mc2, Mc3, Mc4 ... temperature and humidity logger, P1, P2 ... position, R1 ... room, V1 ... gas supply valve, W1 ... moving mechanism section, 10 ... sterilization unit, 11 ... housing, 12 ... lid, 15 ... driving wheel, Reference Signs List 20 pole 21 water tank 21a water supply pipe 22 chemical solution tank 22a chemical liquid supply pipe 23, 24 weight scale 25 liquid switching valve 26 liquid supply pipe 27 gas control unit , 28: electric control unit, 30: rotation mechanism unit, 30a: rotation base, 31: mounting member, 33: camera, 35, 65: two-fluid nozzle, 35a, 65a: spray port, 37, 38: intake unit, 50: Control unit, 51 Eradication management unit, 52 ... injection control unit, 55 ... operation unit, 56 ... display unit, 60 ... turntable.

Claims (5)

A method of sterilizing a space by sterilizing the inside of a space by spraying the chemical solution from a spray port of a two-fluid nozzle supplied with a chemical solution and a gas,
A method for sterilizing bacteria, characterized in that the chemical solution is sprayed under predetermined spray conditions with the spray ports directed in a plurality of spray directions in a horizontal plane.   The sterilization method according to claim 1, wherein the spraying is performed for a time in which the relative humidity of the chemical solution in the space to be sprayed in the space is equal to or higher than a target humidity under the spraying condition.   The sterilization solution according to claim 1 or 2, wherein the chemical solution is sprayed in a spray scheduled area excluding a spray exclusion area in which an obstacle is present in the space.   After the spraying is completed for a plurality of spraying directions, the two-fluid nozzle is moved, and the spray ports are directed sequentially to a plurality of spraying directions in a horizontal plane at the moving destination to spray the chemical solution under the spraying conditions. The sterilization method according to any one of claims 1 to 3, characterized in that A two-fluid nozzle that supplies a chemical solution and a gas and sprays the chemical solution from the spray port;
A rotation mechanism unit that rotates the two-fluid nozzle about a vertical axis;
The rotation mechanism is controlled so that the spray port is directed in a plurality of spray directions in a horizontal plane, and the chemical solution is sprayed from the spray port directed in the spray direction under predetermined spray conditions. And a control unit for performing control so that

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