Hypochlorous acid concentration measurement device and hypochlorous acid water generation device

Abstract

A hypochlorous acid concentration measurement device (100) for measuring the concentration of hypochlorous acid generated by electrolyzing chlorine-containing water in an electrolytic bath (210), the hypochlorous acid concentration measurement device (100) comprising: a measurement means (110) for measuring conductivity information indicating the conductivity of hypochlorous acid water stored in the electrolytic bath (210); and a measurement control device (120) that controls the measurement unit (110). The measurement control device (120) is provided with: a measurement information acquisition unit (121) that acquires conductivity information; a conversion information acquisition unit (122) that acquires conversion information; and a concentration calculation unit (123) that calculates the hypochlorous acid concentration on the basis of the measured conductivity information and conversion information.

Description

Technical Field

[0001] The present invention relates to a hypochlorous acid concentration measuring device and a hypochlorous acid water generating device comprising the hypochlorous acid concentration measuring device. Background Art

[0002] For example, Patent Document 1 describes a so-called ultraviolet absorption measurement technique for measuring the concentration of hypochlorous acid water based on the attenuation of light absorption caused by hypochlorous acid ions absorbing ultraviolet rays.

[0003] In addition, Patent Document 2 describes a so-called polarographic measurement technique for measuring the concentration of hypochlorous acid water based on the electrochemical reduction current of hypochlorous acid.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2000-343080

[0007] Patent Document 2: Japanese Patent Application Publication No. 2011-7508 Summary of the invention

[0008] Technical problem to be solved by the invention

[0009] When using ultraviolet absorption measurement technology, the light source that emits ultraviolet light for measurement will deteriorate in a short period of time, causing the measured value of hypochlorous acid water concentration to fluctuate. Therefore, in order to stabilize the measured value, correction work is required, which makes the operation complicated. In addition, ultraviolet components are expensive, which poses a cost problem.

[0010] When using polarographic measurement technology, the measured value of hypochlorous acid water concentration will change due to the contamination of the electrodes used for measurement. Therefore, in order to stabilize the measured value, it is necessary to clean the electrodes, etc., which makes the operation complicated. In addition, since the material of the electrodes is precious metal, the price of the measurement device itself is expensive, which is a problem in terms of cost.

[0011] The inventors conducted in-depth research and experiments based on the above technical problems, and found that the conductivity of hypochlorous acid water that can be stably measured can become an indicator that more accurately represents the concentration of hypochlorous acid water. The present invention is completed based on the inventors' insights, and its purpose is to provide a hypochlorous acid concentration measuring device, a space sterilization device, and a hypochlorous acid concentration measuring method that can measure the concentration of hypochlorous acid water with a simple structure.

[0012] Technical means for solving technical problems

[0013] In order to achieve the above object, a hypochlorous acid concentration measuring device according to one embodiment of the present invention is a hypochlorous acid concentration measuring device for measuring the concentration of hypochlorous acid generated by electrolyzing chlorine-containing water stored in an electrolytic cell, the hypochlorous acid concentration measuring device comprising: a measuring unit for measuring conductivity information indicating the conductivity of hypochlorous acid water stored in the electrolytic cell; and a measuring control device for controlling the measuring unit. The measuring unit comprises: a pair of measuring electrodes arranged in an isolated state in the hypochlorous acid water stored in the electrolytic cell; and an applying measuring device for applying an AC voltage or an AC current of a predetermined AC cycle between the pair of measuring electrodes, the measuring control device comprising: a measuring information acquisition unit for acquiring conductivity information from the measuring unit at an acquisition cycle slower than the time resolution of the measuring unit; a conversion information acquisition unit for acquiring conversion information indicating the relationship between the hypochlorous acid concentration and the conductivity information; and a concentration calculation unit for calculating the hypochlorous acid concentration based on the conductivity information corresponding to a plurality of cycles of the AC cycle and the conversion information.

[0014] In addition, a hypochlorous acid water generating device according to one embodiment of the present invention includes: an electrolytic cell storing chlorine-containing water; an electrolytic electrode arranged in an inserted state in the electrolytic cell; an electrolytic device for applying voltage to the electrolytic electrode to electrolyze the chlorine-containing water to generate hypochlorous acid water; the hypochlorous acid concentration measuring device; and a main control device for controlling the electrolytic device. The measuring control device includes: an electrolysis execution acquisition unit for acquiring execution information indicating the execution of electrolysis; and a measurement instruction unit for causing the measuring unit to perform conductivity information measurement when electrolysis is not performed based on the execution information. The concentration calculation unit calculates the hypochlorous acid concentration based on the conductivity information measured before and after the execution of electrolysis and the conversion information, and the main control device includes an electrolysis control unit for outputting electrolysis information that the hypochlorous acid concentration in the electrolytic cell has reached a target concentration to the electrolytic device based on the information on the hypochlorous acid concentration calculated by the concentration calculation unit.

[0015] Effects of the Invention

[0016] According to the present invention, the concentration of hypochlorous acid can be measured efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram simply showing a space sterilization device from the side.

[0018] Figure 2 This is a block diagram showing the functional structure of the measurement control device.

[0019] Figure 3 This is a graph showing the relationship between the hypochlorous acid concentration and the conductivity of hypochlorous acid water during the generation period.

[0020] Figure 4This is a graph showing the relationship between the cumulative difference in conductivity during the generation period and the hypochlorous acid concentration.

[0021] Figure 5 This is a block diagram of a liquid resistance value measuring circuit included in the measuring unit.

[0022] Figure 6 This is a flowchart showing the working process of the space sterilization device during the generation period of hypochlorous acid.

[0023] Figure 7 This is a flow chart showing the working process of the space sterilization device during the attenuation period of hypochlorous acid.

[0024] Figure 8 It is a graph showing the relationship between the hypochlorous acid concentration and the conductivity of hypochlorous acid water during the decay period.

[0025] Fig. 9 It is a graph showing the relationship between the cumulative difference in conductivity during the decay period and the hypochlorous acid concentration.

[0026] Fig.10 This is a block diagram showing the functional configuration of the main control device.

[0027] Fig.11 It is a graph showing the temporal change of hypochlorous acid concentration in the generation period and the decay period.

[0028] Fig.12 This is a graph showing the relationship between the AC waveform on the output side detected by the liquid resistance value measuring device and the acquisition period.

[0029] Fig.13 This is a diagram for explaining how the acquisition cycle is updated.

[0030] Fig.14 This is a graph showing the temporal change of the hypochlorous acid concentration in the generation period and the decay period for stabilizing the hypochlorous acid concentration. DETAILED DESCRIPTION

[0031] The following is an explanation of the embodiments of the hypochlorous acid concentration measuring device, hypochlorous acid water generating device, space sterilization device and hypochlorous acid concentration measuring method involved in the present invention with reference to the accompanying drawings. Among them, the following embodiment is an example listed for illustrating the present invention, and its gist is not limited to the present invention. For example, the shape, structure, material, constituent elements, relative positional relationship, connection state, numerical value, formula, content of each stage in the method, order of each stage, etc. shown in the following embodiment are examples, and sometimes include content not recorded below. In addition, sometimes geometric expressions such as parallel and orthogonal are used, but these expressions are not strict expressions in the mathematical sense, and include substantially allowed errors, deviations, etc. In addition, expressions such as simultaneous and identical also include substantially allowed ranges.

[0032] In addition, the accompanying drawings are schematic diagrams that are appropriately emphasized, omitted, or adjusted in ratio for the purpose of explaining the present invention, and are different from the actual shapes, positional relationships, and ratios. In addition, the X-axis, Y-axis, and Z-axis shown in the drawings sometimes represent orthogonal coordinates arbitrarily set for the purpose of explaining the drawings. In other words, the Z-axis is not limited to an axis along the vertical direction, and the X-axis and Y-axis are not limited to axes existing in the horizontal plane.

[0033] In addition, a plurality of inventions may be described collectively as one embodiment below. Also, some of the contents described below are described as arbitrary components related to the present invention.

[0034] Furthermore, the flowchart is an example, and even if the order of processing is different, a plurality of processing is integrated, a single processing is separated, or the like, the process is different, such as the process being included in the embodiments of the present invention.

[0035] Figure 1 This is a diagram showing a space sterilization device 200 in a simplified manner from the side. The space sterilization device 200 releases at least hypochlorous acid in hypochlorous acid water into the space. Furthermore, the space sterilization device 200 introduces the atmosphere in the space into the hypochlorous acid water. The space is a closed space such as an indoor space of a building. Specifically, the living space of an ordinary family, or the indoor space of a hospital or a nursing institution, etc. can be exemplified as the space. However, the space may not be a completely closed space, and may be connected to the outside. Furthermore, the space may be not only a space inside a building, but also a space inside a moving body such as a train or a car.

[0036] Hypochlorous acid water has a sterilizing and deodorizing effect. Specifically, hypochlorous acid water has an oxidizing effect, which decomposes floating bacteria in the space, attached bacteria attached to objects, or odorous substances through oxidation, thereby sterilizing and deodorizing. Among them, the word "sterilization" is a word recorded for convenience within the scope of this specification and the protection requested, and includes the meaning of "sterilization". In addition, when recording "bacteria", viruses, molds, etc. are also included.

[0037] like Figure 1 As shown, the space sterilization device 200 includes an electrolytic cell 210 , an electrolytic electrode 220 , an electrolytic device 230 , a hypochlorous acid concentration measuring device 100 , a diffusion unit 240 , and a main control device 250 .

[0038] The electrolytic cell 210 is a water tank for storing chlorine-containing water, and the chlorine-containing water is electrolyzed to generate hypochlorous acid water in the electrolytic cell 210. Examples of the chlorine-containing water include water in which salt is dissolved.

[0039] The electrolysis electrode 220 is a pair of conductive components arranged in an inserted state in the chlorine-containing water stored in the electrolytic cell 210. The shape of the electrolysis electrode 220 is not particularly limited. In the case of the present embodiment, it is a rectangular plate (strip). A pair of electrolysis electrodes 220 are arranged in a manner that their respective main surfaces (surfaces with the largest area) are opposite. Regarding the material of the electrolysis electrode 220, as long as it is a conductive material, there is no particular limitation. For example, the electrolysis electrode 220 can be exemplified by a composition in which a catalyst layer is covered on the surface of a conductive substrate. For example, the conductive substrate can include a single substance of a metal such as titanium, iron, copper, niobium, tantalum, or their alloys. Considering the ease of processing or manufacturing cost during manufacturing, the material of the conductive substrate is preferably titanium or a titanium alloy. The catalyst layer can be exemplified by a catalyst containing platinum or iridium. As a mixture contained in other catalyst layers, it can be any metal state of metals, alloys, metal oxides, etc., for example, lead, gold, nickel, copper, silver, iron, palladium, ruthenium, rhodium, carbon, etc.

[0040] The electrolysis device 230 is a DC power supply device that applies a predetermined DC voltage between a pair of electrolysis electrodes 220. The electrolysis device 230 selects whether to apply a voltage to the pair of electrolysis electrodes 220, that is, selects whether to turn on or off the voltage applied to the pair of electrolysis electrodes 220, under the control of the main control device 250.

[0041] The diffusion unit 240 is located on the tube axis ( Figure 1 The diffusion unit 240 is a cylindrical component that rotates in a circumferential direction (left and right directions in the electrolytic cell). Part of the periphery of the diffusion unit 240 is periodically immersed in the hypochlorous acid water stored in the electrolytic cell 210, and the water is lifted above the liquid surface of the hypochlorous acid water by using capillary phenomena and the like. By circulating air between the hypochlorous acid water lifted above the liquid surface, at least the hypochlorous acid in the hypochlorous acid water is diffused into the atmosphere in the space. Bacteria (including viruses, molds, etc.) existing in the atmosphere come into contact with the hypochlorous acid water lifted by the diffusion unit 240 and are sterilized (including inactivation of viruses, molds, etc.). In addition, they are also sterilized by coming into contact with at least the hypochlorous acid in the hypochlorous acid water diffused into the atmosphere.

[0042] Alternatively, the diffusion unit 240 may be a device that micronizes the hypochlorous acid water in the electrolysis device 230 by centrifugal crushing or the like and releases the micronized hypochlorous acid water into the space, thereby diffusing at least hypochlorous acid in the hypochlorous acid water into the space.

[0043] The main control device 250 has a processor and is a device that controls the space sterilization device 200 by causing the processor to execute a program. In the case of the present embodiment, the main control device 250 obtains the hypochlorous acid concentration in the electrolytic cell 210 from the hypochlorous acid concentration measuring device 100 described later, and controls the electrolysis device 230 so that the hypochlorous acid concentration is constant. Among them, the technology for making the hypochlorous acid concentration constant is described later. Here, the hypochlorous acid concentration refers to the total concentration of hypochlorous acid and hypochlorous acid ions. In addition, the main control device 250 obtains water level information indicating the water level from the water level sensor 260 provided in the electrolytic cell 210, and when the water level in the electrolytic cell 210 does not reach the specified water level threshold, the electrolysis device 230 is controlled not to work.

[0044] The hypochlorous acid concentration measuring device 100 is a device for measuring the concentration of hypochlorous acid generated by electrolyzing chlorine-containing water stored in an electrolytic cell 210 , and includes a measuring unit 110 and a measurement control device 120 .

[0045] The measuring unit 110 is a device for measuring conductivity information indicating the conductivity of the hypochlorous acid water stored in the electrolytic cell 210, and includes a pair of measuring electrodes 111 and a measuring device 112. In the case of this embodiment, the measuring unit 110 has a water temperature sensor 113 for measuring temperature information indicating the temperature of the water stored in the electrolytic cell 210. The measuring unit 110 acquires the conductivity information at a predetermined time resolution. The time resolution of the measuring unit 110 is, for example, in the order of nanoseconds.

[0046] The measuring electrode 111 is a pair of conductive components arranged in an isolated state in the hypochlorous acid water stored in the electrolytic cell 210. The shape of the measuring electrode 111 is not particularly limited. In the case of the present embodiment, it is a rectangular plate (strip) that is smaller than the electrolytic electrode 220. A pair of measuring electrodes 111 are arranged in a manner in which their respective main surfaces are opposite. There is no particular limitation on the material of the measuring electrode 111 as long as it is a conductive material. Among them, the material of the measuring electrode 111 is preferably a conductive material with corrosion resistance, but there is no particular limitation. Specifically, as the material of the measuring electrode 111, titanium, titanium alloy, stainless steel, etc. can be exemplified. These materials are easy to process into the measuring electrode 111, and the manufacturing cost can also be controlled.

[0047] The measuring device 112 includes an AC power supply device 131 (see Figure 5 ). In addition, the application measuring device 112 includes a liquid resistance value measuring device 132 for measuring the liquid resistance value between a pair of measuring electrodes 111 as conductivity information (see Figure 5). For example, the liquid resistance value measuring device 132 measures the liquid resistance value using electrochemical impedance spectroscopy. The AC current (AC voltage) on the output side generated between a pair of measuring electrodes 111 due to the AC voltage (AC current) on the input side applied by the AC power supply device 131 is detected, and the liquid resistance value is measured based on the input waveform and the output waveform. Electrochemical impedance spectroscopy is a means of measuring the impedance of a solution and analyzing the state of the solution. By measuring the real and imaginary parts of the impedance, the liquid resistance value of the solution can be measured using a Nyquist diagram or the like. The applying measuring device 112 selects whether to apply an AC voltage to a pair of measuring electrodes 111, that is, selects the on / off of applying an AC voltage to a pair of measuring electrodes 111, through the control of the measuring control device 120. The frequency of the AC voltage applied between the pair of measuring electrodes 111 by the applying measuring device 112 is not limited. For example, the frequency of the AC voltage is preferably selected from a range of more than 1 kHz and less than 100 kHz. In addition, the applying measuring device 112 can also be a device that can arbitrarily adjust the applied frequency. By applying the AC voltage in the relatively high frequency range, the liquid resistance value measuring device can measure the liquid resistance value in a state where there is no imaginary term when calculating the liquid resistance value of hypochlorous acid water by the AC impedance method. In addition, as the applying and measuring device 112, a case where an AC power supply device 131 for applying an AC voltage is illustrated, the applying and measuring device 112 may not have the AC power supply device 131 for applying an AC current. In this case, the measuring control device 120 can control the AC current.

[0048] Figure 2 1 is a block diagram showing the functional structure of the measurement control device 120. The measurement control device 120 has a processor, and controls the timing of applying the alternating voltage to the pair of measuring electrodes 111 by causing the processor to execute a program. In addition, conductivity information indicating the conductivity of hypochlorous acid water obtained by applying the alternating voltage is obtained. The measurement control device 120 has a measurement information acquisition unit 121 as a processing unit, a conversion information acquisition unit 122, and a concentration calculation unit 123. In the case of this embodiment, the measurement control device 120 has an electrolysis execution acquisition unit 125, a measurement instruction unit 124, a correction information acquisition unit 126, a measurement adjustment unit 127, and a cleaning unit 128.

[0049] The measurement information acquisition unit 121 acquires conductivity information from the measurement unit 110. The conductivity information acquired from the measurement unit 110 is not particularly limited, and may be the conductivity (electrical conductivity) of the hypochlorous acid water, or information that can derive the conductivity through calculation. For example, the conductivity information may also be the liquid resistance value of the hypochlorous acid water. The measurement information acquisition unit 121 may also acquire the liquid resistance value measured by the measurement control device 120 using the AC impedance method, and calculate the inverse of the acquired liquid resistance value to derive the conductivity. In the case of the present embodiment, the measurement information acquisition unit 121 acquires the conductivity information at an acquisition period 302 (see Fig.12 ) to obtain conductivity information. For example, the acquisition period 302 of the measurement information acquisition unit 121 is in the microsecond level. By collecting conductivity information at a slower periodic interval, conductivity information including phase information can be easily obtained. Therefore, even a measurement control device 120 operating at a low speed can derive conductivity, and low cost can be achieved. The acquisition period 302 is preferably a time corresponding to one of the AC cycles of the AC voltage (AC current) applied by the measurement device 112 divided by a specified number of divisions, that is, a division time, and the product of an integer that is relatively prime to the division number and is greater than 3. Specifically, for example Fig.12 As shown, when the AC cycle 300 applied by the measuring device 112 is 10 μs (100 kHz), the number of divisions is 10, and the division time 301 corresponding to one of the 10 equal divisions is 1 μs, the acquisition cycle 302 is 3 μs, which is the product of 3 of one of the integers coprime to the division number 10 and greater than 3. Therefore, the measurement information acquisition unit 121 acquires Fig.12 The arrows in the figure show the conductivity information of the phase.

[0050] In the case of the present embodiment, the measurement information acquisition unit 121 also acquires temperature information from the water temperature sensor 113 included in the measurement unit 110 .

[0051] The conversion information acquisition unit 122 acquires conversion information indicating the relationship between the hypochlorous acid concentration and the above-mentioned conductivity information. The inventors stored chlorine-containing water (hereinafter referred to as water in this paragraph) in the electrolytic cell 210, and electrolyzed the water for a specified time and at a specified voltage. When electrolysis was not performed at all (0 times), the hypochlorous acid concentration and the conductivity of the water were measured, and each time the electrolysis of the water was performed under the above-mentioned conditions, the hypochlorous acid concentration and the conductivity of the water were measured. Based on the above experiments, the inventors found that the hypochlorous acid concentration and the conductivity of the water are as follows: Figure 3 As shown, it is inversely proportional. Figure 3 The n described is an integer, and the description of specific numerical values ​​of hypochlorous acid concentration and conductivity is omitted.

[0052] Based on the above, the inventor created a function as the conversion information Figure 4 The conversion information showing the relationship between the hypochlorous acid concentration and the conductivity is shown in the graph of . In the case of this embodiment, the conversion information acquisition unit 122 acquires the above-mentioned function stored in the storage device 102 possessed by the measurement control device 120 as the conversion information. Among them, Figure 4 The generation period conversion information is displayed as the conversion information used for the generation period of hypochlorous acid. Figure 4 The vertical axis of the graph shown represents the difference in electrical conductivity. The difference in electrical conductivity will be described later.

[0053] The concentration calculation unit 123 calculates the hypochlorous acid concentration based on the conductivity information obtained from the measuring unit 110 and the conversion information obtained by the conversion information acquisition unit 122. The concentration calculation unit 123 outputs the calculated hypochlorous acid concentration to the main control device 250. The specific description of the concentration calculation unit 123 is described later. In addition, the hypochlorous acid concentration calculated by the concentration calculation unit 123 may not be the accurate (absolute) concentration of hypochlorous acid in the aqueous solution. For example, the hypochlorous acid concentration also includes a relative concentration that is lower than the baseline concentration or higher than the baseline concentration, taking the concentration calculated last time as the baseline concentration. In addition, even if the difference (numerical difference) from the baseline concentration is unclear, it is included in the hypochlorous acid concentration.

[0054] The electrolysis execution acquisition unit 125 acquires execution information indicating the execution status of electrolysis performed by the electrolysis device 230 and the electrolysis electrode 220 from the main control device 250. Thus, the electrolysis execution acquisition unit 125 can understand whether electrolysis is being performed or not being performed in the electrolytic cell 210 based on the execution information.

[0055] The measurement instruction unit 124 controls the measurement unit 110 so that the conductivity information is measured when the electrolysis is not being performed based on the execution information acquired by the electrolysis execution acquisition unit 125. Thus, even if the electrolysis device 230 and the measurement control device 120 are not reliably insulated, the conductivity information can be accurately measured, the number of parts can be reduced, and the device can be miniaturized.

[0056] The correction information acquisition unit 126 acquires correction information indicating temperature correction when calculating the hypochlorous acid concentration from the measured conductivity information. The correction information can be prepared by experimentally changing the temperature of the water in the electrolytic cell 210 and measuring the relationship between the temperature and the concentration of the hypochlorous acid water. Alternatively, the temperature coefficient of conductivity can be used as correction information.

[0057] The temperature coefficient of electrical conductivity is expressed by the following formula 1.

[0058]

[0059] t: Temperature of hypochlorous acid water (temperature information)

[0060] K: Conductivity

[0061] α: Temperature coefficient

[0062] α varies depending on the type of solute dissolved in water. The inventors found that the temperature coefficient of NaCl water (diluted salt water) (226*10^(-4)) is appropriate when performing temperature correction of hypochlorous acid concentration. * and · represent multiplication operations, and ^ represents power operations.

[0063] The concentration calculation unit 123 calculates the concentration of hypochlorous acid using two conductivity information measured before and after performing one electrolysis at a predetermined time and a predetermined voltage. Thus, the influence of the hardness of chlorinated water on the conversion information can be eliminated. Specifically, for example, when tap water is used to produce chlorinated water, the hardness of the water varies depending on the region. By using the conductivity information before and after one electrolysis, the concentration of hypochlorous acid can be calculated using universal conversion information in any region.

[0064] As a specific calculation method, after the water in the electrolytic cell 210 is replaced, the difference in the initial conductivity information before electrolysis is as follows: Figure 4 The concentration of hypochlorous acid may be set to 0. Alternatively, the conductivity information may be acquired by actually performing measurement.

[0065] Next, after one electrolysis is performed, the measurement instruction unit 124 operates the measurement device to perform the measurement. The measurement information acquisition unit 121 acquires the conductivity information (liquid resistance value) and converts it into conductivity. With respect to the obtained conductivity, the corrected conductivity corresponding to the temperature is derived based on the temperature information acquired by the measurement information acquisition unit 121 and the correction information acquired by the correction information acquisition unit 126. Here, when the measurement information acquisition unit 121 acquires the conductivity information at an acquisition cycle 302 slower than the time resolution of the measurement unit 110, the conductivity is derived based on the conductivity information of a plurality of AC cycles applied by the measurement device 112. Specifically, based on the conductivity information of a plurality of AC cycles, for example, one cycle of the AC current (output side) generated between the measurement electrodes 111 by the AC voltage (input side) applied by the AC power supply device 131 is generated, thereby deriving the conductivity. In addition, the maximum value and the minimum value can be determined based on the conductivity information of a plurality of AC cycles, and the conductivity can be derived based on these values. This eliminates the need for processing to generate a waveform based on scattered point information, and makes it possible to control the load on the measurement control device 120. Next, the corrected conductivity derived last time is subtracted as shown in the following equation 2. The difference obtained by the subtraction is accumulated.

[0066]

[0067] n represents the number of electrolysis times during the generation period.

[0068] Conductivity (n) means the conductivity after the nth electrolysis.

[0069] N represents the total number of electrolysis times during the generation period.

[0070] The concentration calculation unit 123 is based on Figure 4 The conversion information shown calculates the hypochlorous acid concentration based on the accumulation of the conductivity difference.

[0071] The measurement adjustment unit 127 changes the gain of the output power of the AC power supply device 131 included in the measurement device 112 (see Figure 5 (a)) and changing at least one of the gain of the liquid resistance value measuring device 132 (refer to Figure 5 (b)) so that the conductivity information measured by the measuring unit 110 falls within a specified range. Thus, the conductivity can be measured with high accuracy. The method for adjusting the gain is not particularly limited, and an example of a method in which the gain is slowly increased from a small gain to a gain before the liquid resistance value as the output is about to be saturated can be exemplified. In addition, the measurement adjustment unit 127 only needs to perform at least one gain change in the initial stage when the electrolytic cell 210 is filled with chlorine-containing water.

[0072] After confirming that the measuring electrode 111 is completely immersed in the chlorine-containing water stored in the electrolytic cell 210 based on the water level information measured by the water level sensor 260 provided in the electrolytic cell 210, the cleaning unit 128 operates the applying and measuring device 112 to clean the measuring electrode 111. Cleaning is performed by applying an AC voltage to the measuring electrode 111 at the maximum output allowed by the applying and measuring device 112. Thus, the dissolution of the crystals of the salt precipitated on the surface of the measuring electrode 111 can be promoted.

[0073] Next, the operation of the space sterilization device 200 will be described. Figure 6 This is a flowchart showing the working process of the space sterilization device 200 during the generation period of hypochlorous acid. First, the main control device 250 confirms that the electrolytic cell 210 is full of water (S101). The cleaning unit 128 of the measuring control device 120, which has obtained the information indicating that it is full of water from the main control device 250, controls the measuring device 112 to apply an AC voltage of a specified power to the measuring electrode 111 to clean the measuring electrode 111 (S102). Then, it waits until a start signal for the electrolysis treatment appears (S103). In the case of the present embodiment, the start signal for the electrolysis treatment is provided by the electrolysis control unit 251 (refer to Fig.10 ) output.

[0074] When the start signal of the electrolysis treatment appears, before the initial electrolysis treatment, the AC power supply device 131 of the measuring device 112 applies a specified AC voltage to the measuring electrode 111, and the liquid resistance value measuring device 132 measures the liquid resistance value of the water in the electrolytic cell 210. In addition, the water temperature sensor 113 performs the measurement of the water temperature (S104). The measurement information acquisition unit 121 of the measurement control device 120 acquires the liquid resistance value as conductivity information, and acquires temperature information. After converting the liquid resistance value into conductivity, the concentration calculation unit 123 uses the temperature information to correct the conductivity based on the correction information. The concentration calculation unit 123 stores the corrected conductivity together with the number of calculations (S105). Among them, the initial measurement after the electrolytic cell 210 is filled with water can be omitted. In the case of omission, the conductivity can store the conductivity equivalent to tap water containing a specified amount of salt as an initial value.

[0075] Next, the electrolysis device 230 applies a DC voltage to the electrolysis electrode 220 for a predetermined time and a predetermined output, and performs electrolysis of the chlorine-containing water in the electrolysis cell 210 (S106). Thus, hypochlorous acid water is generated.

[0076] When the measurement instruction unit 124 determines that the electrolysis is finished based on the execution information obtained by the electrolysis execution acquisition unit 125, the measurement instruction unit 124 controls the measurement unit 110 to measure the liquid resistance value. In addition, the measurement information acquisition unit 121 obtains temperature information (S107). The concentration calculation unit 123 converts the inverse of the liquid resistance value into conductivity and calculates the conductivity based on the correction information. Then, the difference between the conductivity calculated last time and the conductivity calculated this time is calculated. And the obtained difference is accumulated as shown in Formula 2 (S109). The concentration calculation unit 123 uses the accumulated difference and the conversion information to calculate the hypochlorous acid concentration (S110), and outputs the calculated hypochlorous acid concentration to the main control device 250 (S111).

[0077] The above-mentioned operation from electrolysis (S106) to output of hypochlorous acid concentration (S111) is repeated until an end signal of electrolysis treatment appears (until the generation period ends). For example, when the main control device 250 determines that the hypochlorous acid concentration exceeds a predetermined concentration threshold value (refer to Fig.11 ), the electrolysis control unit 251 can issue an end signal for the electrolysis treatment.

[0078] As described above, the hypochlorous acid concentration measuring device 100 according to this embodiment can provide the concentration of hypochlorous acid water obtained by electrolyzing chlorine-containing water with an inexpensive module. In addition, the hypochlorous acid concentration measuring device 100 has a relatively simple structure and can stably measure the hypochlorous acid concentration over a long period of time.

[0079] Furthermore, by calculating the hypochlorous acid concentration using the difference in conductivity before and after the first electrolysis, even when the chlorinated water contains various hardness components or the hardness component content ratios are different, the information related to the hardness component can be offset using the difference in conductivity. Therefore, even when the hardness component of water varies due to regional differences, etc., the hypochlorous acid concentration can be stably calculated with high accuracy using one conversion information.

[0080] Furthermore, by adopting the AC impedance method of measuring the liquid resistance by applying an AC voltage, the circuit configuration of the measuring device 112 can be relatively simple. Furthermore, by selecting the frequency of the applied AC voltage from the range of 1 kHz to 100 kHz, the liquid resistance can be stably measured.

[0081] Furthermore, by adding temperature correction to the conductivity based on the water temperature in the electrolytic cell 210 , the hypochlorous acid concentration can be accurately calculated with high precision.

[0082] Furthermore, by adjusting the gain of at least one of the AC power supply device and the liquid resistance value measuring device 132, the output in the initial stage becomes a large output to a degree that is not saturated, and high-precision concentration measurement can be achieved.

[0083] Furthermore, by promoting the dissolution of salt crystals attached to the measuring electrode 111 through the cleaning process, it is possible to suppress the variation of the measurement result due to the attached matter on the measuring electrode 111, thereby achieving high-precision concentration measurement.

[0084] Figure 7 This is a flowchart showing the workflow of the space sterilization device 200 during the attenuation period of hypochlorous acid. When receiving the end signal of the electrolysis treatment indicating the end of the generation period, the concentration calculation unit 123 stores the hypochlorous acid concentration calculated based on the difference between the conductivity information which is the conductivity measured before the last electrolysis of the generation period and the post-conductivity information which is the conductivity information measured after the electrolysis in the storage device 102. In addition, the post-conductivity information is stored in the storage device 102.

[0085] After receiving the end signal of the electrolysis treatment, the measurement instruction unit 124 waits for a predetermined time based on the information from the timing unit (not shown) (S202), and then controls the measurement unit 110 to measure the liquid resistance value. In addition, the measurement information acquisition unit 121 acquires the temperature information (S203). The concentration calculation unit 123 converts the inverse of the liquid resistance value into conductivity, and calculates the conductivity based on the correction information. Then, the difference between the conductivity based on the post-conductivity information stored in the storage device 102 and the conductivity calculated this time is calculated. And, the difference obtained is accumulated as shown in Formula 3 (S205). Among them, the difference is a positive value during the decay period.

[0086]

[0087] m represents the number of times the liquid resistance value is measured during the decay period.

[0088] The conductivity (m) means the conductivity at the time of the mth measurement.

[0089] M represents the total number of times the liquid resistance value is measured during the decay period.

[0090] The concentration calculation unit 123 calculates the hypochlorous acid concentration using the accumulated difference using the conversion information (S206). In the present embodiment, the conversion information acquisition unit 122 acquires decay period conversion information different from the generation period conversion information used as the conversion information of the generation period as the conversion information.

[0091] The inventors found that the relationship between the concentration of hypochlorous acid and the conductivity of water during the decay period is as follows: Figure 8 As shown, Figure 3 The generation period is different as shown in the figure, and the change shows an exponential function over time. However, the cumulative relationship between the difference between the hypochlorous acid concentration and the conductivity during the generation period and the decay period is as follows: Figure 4 , Fig. 9 As shown, both are in proportional relationship. Figure 8 The m recorded in is an integer. In addition, the specific values ​​of hypochlorous acid concentration and conductivity are omitted. Based on the above content, the inventors created a function as decay period conversion information. Fig. 9 In the present embodiment, the conversion information acquisition unit 122 acquires the function stored in the storage device 102 included in the measurement control device 120 as the decay period conversion information.

[0092] The concentration calculation unit 123 calculates the hypochlorous acid concentration using the decay period conversion information. The concentration calculation unit 123 outputs the calculated hypochlorous acid concentration to the main control device 250 (S207).

[0093] Fig.10 This is a block diagram showing a processing unit realized by causing the processor of the main control device 250 to execute a program. When the hypochlorous acid concentration obtained from the concentration calculation unit 123 of the hypochlorous acid concentration measuring device 100 is lower than a predetermined lower limit threshold value (S208, Yes), the electrolysis control unit 251 of the main control device 250 outputs a start signal for electrolysis processing (S209) and controls the electrolysis device 230 so that the decay period ends and the generation period of hypochlorous acid generation begins. On the other hand, when the hypochlorous acid concentration is not lower than the lower limit threshold value (S208, No), after a predetermined time of waiting (S202), a series of processes for outputting the hypochlorous acid concentration (S203-S207) are executed.

[0094] In the generation period after the decay period, the hypochlorous acid concentration for judging the end of the generation period can be judged by using an additional concentration threshold value different from the concentration threshold value for judging the end of the initial electrolysis treatment (the end of the initial generation period) (in this embodiment, higher than the concentration threshold value) (see Fig.11 ). In addition, the measurement of the liquid resistance value of the water in the electrolytic cell 210 after the start signal of the electrolysis treatment is output, the measurement of the water temperature (S104) and the conductivity water temperature correction (S105) can also use the data at the end of the decay period.

[0095] As described above, during the decay period, the hypochlorous acid concentration can be directly measured at predetermined intervals using the structure for generating hypochlorous acid. Thus, the hypochlorous acid concentration in the electrolytic cell 210 can be maintained between the lower limit threshold and the additional concentration threshold. Therefore, the effect of the space sterilization device 200 can be continuously maintained for a long time.

[0096] Furthermore, the electrolysis control unit 251 may also be configured as follows: Fig.14 As shown, the hypochlorous acid concentration in the electrolytic cell 210 is stabilized over time. Specifically, the electrolysis control unit 251 obtains the hypochlorous acid concentration calculated by the concentration calculation unit 123, and when the hypochlorous acid concentration is below the lower limit threshold, the electrolysis device 230 can be controlled based on electrolysis information that the hypochlorous acid concentration in the electrolytic cell 210 reaches a target concentration that is above the lower limit threshold, at least below the additional concentration threshold, and preferably below the concentration threshold.

[0097] Here, the electrolysis information includes information related to the applied charge amount, which is the charge amount required to reach the target concentration from the current hypochlorous acid concentration. As shown in the following formula 4, the applied charge amount is proportional to the product of the current value input to the electrolysis electrode 220 during electrolysis and the duration of time as the input current.

[0098] Applied charge amount = current value * duration... Formula 4

[0099] In the present embodiment, the electrolysis information includes the current value and the duration. The electrolysis control unit 251 calculates the electrolysis information that the hypochlorous acid concentration reaches the target concentration, and the electrolysis control unit 251 changes at least one of the current value and the duration to calculate the electrolysis information that reaches the target concentration.

[0100] Furthermore, the electrolysis control unit 251 may divide the duration included in the electrolysis information into a plurality of segments. Specifically, the relationship of the following formula 5 holds.

[0101]

[0102] S: number of divisions

[0103] Total Applied Charge: The amount of charge required to achieve the target concentration

[0104] Current value (s): the current value of the sth time

[0105] Duration(s): Duration of the sth time

[0106] In addition, the electrolysis control unit 251 can also calculate electrolysis information including interval information, which indicates an interval of a first time interval from the start of the electrolysis corresponding to the acquired execution information to the next electrolysis. Here, the first time is specifically a time of more than 30 minutes. The inventor has learned from experience that by separating the intervals of more than 30 minutes, the load on the electrolysis electrode 220 can be reduced, which helps to prolong the life of the electrolysis electrode 220. In addition, the first time can also be set to a short time of less than 10 minutes. The inventor has learned from experience that by performing electrolysis at intervals of less than 10 minutes, the concentration of hypochlorous acid in the electrolytic cell 210 becomes uniform.

[0107] In addition, when the hypochlorous acid concentration calculated by the concentration calculation unit 123 is higher than the target concentration immediately after the generation period ends, the electrolysis control unit 251 outputs to the measurement control device 120 measurement instruction information for executing conductivity information measurement after a predetermined second time has passed since the electrolysis corresponding to the execution information was executed, acquires the hypochlorous acid concentration calculated by the concentration calculation unit 123 after the second time has passed, calculates electrolysis information including the concentration reduction time at which the hypochlorous acid concentration in the electrolytic cell 210 reaches a lower limit threshold value below the target concentration, and controls the electrolysis device 230 so as to start electrolysis at a time after the concentration reduction time has passed. Furthermore, the electrolysis control unit 251 may output to the measurement control device 120 measurement instruction information for executing conductivity information measurement after a predetermined third time has passed since the second time has passed, acquires the hypochlorous acid concentration calculated by the concentration calculation unit after the third time has passed, and updates the concentration reduction time at which the hypochlorous acid concentration in the electrolytic cell becomes lower than the target concentration, thereby improving the accuracy of the concentration reduction time.

[0108] The embodiment (1-1) of the hypochlorous acid concentration measuring device 100 derived from the above-mentioned embodiment is a hypochlorous acid concentration measuring device 100 for measuring the concentration of hypochlorous acid generated by electrolyzing chlorine-containing water stored in an electrolytic cell 210, and includes: a measuring unit 110 for measuring conductivity information indicating the conductivity of hypochlorous acid water stored in the electrolytic cell 210; and a measurement control device 120 for controlling the measuring unit 110. The measurement control device 120 includes a measurement information acquisition unit 121 for acquiring conductivity information from the measuring unit 110, a conversion information acquisition unit 122 for acquiring conversion information indicating the relationship between the hypochlorous acid concentration and the conductivity information, and a concentration calculation unit 123 for calculating the hypochlorous acid concentration based on the measured conductivity information and the conversion information.

[0109] Thus, the hypochlorous acid concentration can be accurately calculated with a simple configuration.

[0110] In addition, the embodiment (1-2) includes the embodiment (1-1), wherein the measurement control device 120 includes: an electrolysis execution acquisition unit 125 that acquires execution information indicating that electrolysis is being executed; and a measurement instruction unit 124 that causes the measurement unit 110 to execute conductivity information measurement when electrolysis is not being executed based on the execution information. The concentration calculation unit 123 calculates the hypochlorous acid concentration using the difference in conductivity information measured before and after the electrolysis is executed.

[0111] Thus, the hardness of water added to the electrolytic cell 210 can be offset in the measurements before and after electrolysis, and a stable hypochlorous acid concentration can be calculated regardless of the hardness of water added to the electrolytic cell 210 .

[0112] In addition, the embodiment (1-3) includes the embodiment (1-1) or the embodiment (1-2), wherein the measuring unit 110 includes: a pair of measuring electrodes 111 arranged in an isolated state in the hypochlorous acid water stored in the electrolytic cell 210; an applying measuring device 112 for applying an AC voltage selected from a range of 1 kHz to 100 kHz between the pair of measuring electrodes 111; and a liquid resistance value measuring device 132 for measuring the liquid resistance value between the measuring electrodes 111 as the conductivity information. The concentration calculating unit 123 calculates the hypochlorous acid concentration based on the measured liquid resistance value.

[0113] This makes it possible to calculate the liquid resistance value without an imaginary term, and thus simplify the calculation process.

[0114] In addition, method (1-4) includes any one of methods (1-1) to (1-3), wherein the measuring unit 110 includes a water temperature sensor 113 for measuring temperature information indicating the temperature of water stored in the electrolytic cell 210, and the measuring control device 120 includes a correction information acquisition unit 126 for acquiring correction information indicating temperature correction when calculating the hypochlorous acid concentration from the conductivity information, and the concentration calculation unit 123 performs correction based on the temperature information and correction information acquired by the measurement information acquisition unit 121 to calculate the hypochlorous acid concentration.

[0115] This makes it possible to correct the error in the hypochlorous acid concentration due to the temperature in the electrolytic cell 210, and improve the accuracy of the calculated hypochlorous acid concentration.

[0116] In addition, method (1-5) includes any one of methods (1-1) to (1-4), and the measurement control device 120 includes a measurement adjustment unit 127, which adjusts at least one of the output power of the applied measurement device 112 and the gain of the liquid resistance value measurement device 132 so that the conductivity information measured by the measurement unit falls within a specified range.

[0117] This enables accurate measurement of the liquid resistance value, which contributes to accurate calculation of the hypochlorous acid concentration.

[0118] In addition, method (1-6) includes any one of methods (1-1) to (1-5), wherein the measurement information acquisition unit 121 has a cleaning unit 128, which acquires water level information indicating a specified water level from a water level sensor 260 provided in the electrolytic cell 210, and after the measurement control device 120 confirms based on the water level information that the measurement electrode 111 is disposed in chlorine-containing water stored in the electrolytic cell 210, it operates the application measurement device 112 to clean the measurement electrode 111.

[0119] Thereby, the cleanliness of the measuring electrode 111 can be constantly maintained, and the concentration of hypochlorous acid can be stably and accurately calculated.

[0120] In addition, the embodiment (2-1) includes any one of the embodiments (1-1) to (1-6), wherein the measurement control device 120 includes: an electrolysis execution acquisition unit 125 that acquires execution information indicating that electrolysis is being executed; and a measurement instruction unit 124 that causes the measurement unit 110 to perform conductivity information measurement when electrolysis is not being performed based on the execution information. The measurement instruction unit 124 repeatedly performs conductivity information measurement at a predetermined interval after electrolysis is performed and before the next electrolysis is performed, and the concentration calculation unit 123 calculates the respective hypochlorous acid concentrations based on the plurality of conductivity information measured.

[0121] Thus, the attenuation state of the hypochlorous acid concentration in the electrolytic cell 210 after electrolysis is gradually monitored.

[0122] In addition, method (2-2) includes any one of methods (1-1) to (1-6) and method (2-1), wherein the conversion information acquisition unit 122 acquires decay period conversion information, which is different from the generation period conversion information used as information on the generation period of hypochlorous acid, but is conversion information used for the decay period of hypochlorous acid, and the concentration calculation unit 123 calculates the hypochlorous acid concentration based on the measured conductivity information and the decay period conversion information.

[0123] Thus, the concentration of hypochlorous acid in the decay period can be accurately calculated by taking into account the evaporation of water in the electrolytic cell 210 and the like.

[0124] In addition, the mode (2-3) includes any one of the modes (1-1) to (1-6), and the modes (2-1) and (2-2), wherein the measurement control device 120 includes: an electrolysis execution acquisition unit 125 that acquires execution information indicating execution of electrolysis; and a measurement instruction unit 124 that causes the measurement unit 110 to perform conductivity information measurement when electrolysis is not performed based on the execution information. The concentration calculation unit 123 calculates the absolute value of the hypochlorous acid concentration based on: the hypochlorous acid concentration calculated based on the difference between the pre-conductivity information, which is the conductivity information measured before the execution of electrolysis, and the last post-conductivity information of the generation period, which is the conductivity information measured after the execution of electrolysis; and the conductivity information measured after the post-conductivity information of the generation period during the decay period using the post-conductivity information as a reference; and the calculated hypochlorous acid concentration information. The pre-conductivity information measured before the execution of electrolysis may be the conductivity information before the initial electrolysis is performed.

[0125] Thus, even during the decay period, the hardness of water added to the electrolytic cell 210 can be offset between the measurement immediately after electrolysis and the measurement after the decay period, and a stable hypochlorous acid concentration independent of the hardness of water added to the electrolytic cell 210 can be calculated.

[0126] The mode (1-7) of the space sterilization device 200 derived from the above-mentioned embodiment is the following space sterilization device 200, which includes: an electrolytic cell 210 storing chlorine-containing water; an electrolytic electrode 220 arranged in an inserted state in the electrolytic cell 210; an electrolytic device 230 applying a voltage to the electrolytic electrode 220 to electrolyze the chlorine-containing water to produce hypochlorous acid water; a hypochlorous acid concentration measuring device 100 measuring the concentration of hypochlorous acid in the produced hypochlorous acid water; and a diffusion unit 240 that diffuses at least hypochlorous acid in the produced hypochlorous acid water into the atmosphere. The hypochlorous acid concentration measuring device 100 includes: a measuring unit 110 measuring conductivity information indicating the conductivity of the hypochlorous acid water stored in the electrolytic cell 210; and a measurement control device 120 that controls the measuring unit 110. The measurement control device 120 includes: a measurement information acquisition unit 121 that acquires conductivity information from the measurement unit 110; a conversion information acquisition unit 122 that acquires conversion information indicating the relationship between the hypochlorous acid concentration and the conductivity information; and a concentration calculation unit 123 that calculates the hypochlorous acid concentration based on the measured conductivity information and the conversion information.

[0127] Thereby, hypochlorous acid water of a predetermined concentration can be generated, and the space sterilization effect can be efficiently exhibited.

[0128] In addition, the embodiment (2-4) includes the embodiment (1-7), wherein the measurement control device 120 includes: an electrolysis execution acquisition unit 125 that acquires execution information indicating that electrolysis is being executed; and a measurement instruction unit 124 that causes the measurement unit 110 to perform conductivity information measurement when electrolysis is not being performed based on the execution information. The measurement instruction unit 124 repeatedly performs conductivity information measurement at predetermined intervals during a decay period when electrolysis is not being performed after electrolysis is performed during a generation period of hypochlorous acid, and the concentration calculation unit 123 calculates the respective hypochlorous acid concentrations based on the plurality of conductivity information measured.

[0129] This makes it possible to monitor the temporal change in the hypochlorous acid concentration during the decay period, and to efficiently utilize the space sterilization effect.

[0130] In addition, method (2-5) includes method (1-7) or method (2-4), including a main control device 250 having an electrolysis control unit 251, which controls the electrolysis device 230 so that hypochlorous acid is generated when the hypochlorous acid concentration obtained from the hypochlorous acid concentration measuring device 100 is lower than a lower limit threshold during the decay period.

[0131] Thereby, the hypochlorous acid concentration in the electrolytic cell 210 can be maintained within a predetermined range, and the space sterilization effect can be stably maintained.

[0132] In addition, the method (1-8) of measuring the concentration of hypochlorous acid derived from the above-mentioned embodiment is a method of measuring the concentration of hypochlorous acid generated by electrolyzing chlorine-containing water stored in the electrolytic cell 210, wherein the measurement information acquisition unit 121 acquires conductivity information from the measurement unit 110 that measures conductivity information indicating the conductivity of hypochlorous acid water stored in the electrolytic cell 210, the conversion information acquisition unit 122 acquires conversion information indicating the relationship between the hypochlorous acid concentration and the conductivity information, and the concentration calculation unit calculates the hypochlorous acid concentration based on the acquired conductivity information and the conversion information.

[0133] This makes it possible to accurately measure the hypochlorous acid concentration using a simple device.

[0134] In addition, method (2-7) includes method (1-8), wherein the measurement information acquisition unit 121 acquires conductivity information from the measurement unit 110 that measures conductivity information indicating the conductivity of hypochlorous acid water stored in the electrolytic cell 210 at predetermined intervals during a decay period in which electrolysis is not performed after electrolysis is performed during a generation period of hypochlorous acid.

[0135] Thereby, the attenuation state of the hypochlorous acid concentration can be accurately measured.

[0136] In addition, method (3-1) includes any one of methods (1-1) to (1-6) and methods (2-1) to (2-3), wherein the measurement information acquisition unit 121 acquires conductivity information from the measurement unit 110 at an acquisition cycle 302 that is slower than the time resolution of the measurement unit 110, and the concentration calculation unit 123 calculates the hypochlorous acid concentration based on the conductivity information corresponding to multiple cycle amounts of the AC cycle and the conversion information.

[0137] Thus, the electrical conductivity can be derived even by using the measurement control device 120 with a low operation speed, and cost reduction can be achieved.

[0138] In addition, method (3-2) includes any one of method (3-1), method (1-1) to method (1-6), and method (2-1) to method (2-3), wherein the measuring unit 110 includes a liquid resistance value measuring device 132 for measuring the liquid resistance value between the measuring electrodes 111 as conductivity information, and the concentration calculating unit 123 calculates the hypochlorous acid concentration based on the measured liquid resistance value.

[0139] Thus, the hypochlorous acid concentration can be accurately calculated with a simple configuration.

[0140] In addition, method (3-3) includes any one of method (3-2), method (1-1) to method (1-6), and method (2-1) to method (2-3), wherein the measuring device 112 applies an AC voltage or an AC current between a pair of measuring electrodes 111 at a frequency at which the liquid resistance value measured by the liquid resistance value measuring device 132 does not have an imaginary component.

[0141] Thus, the hypochlorous acid concentration can be calculated by simple calculation, and the burden on the hypochlorous acid concentration measuring device 100 can be reduced.

[0142] In addition, method (3-4) includes any one of methods (3-1) to (3-3), methods (1-1) to (1-6), and methods (2-1) to (2-3), and the acquisition period 302 is the time corresponding to one of the times after the AC cycle applied by the application measuring device 112 is divided by a specified division number, that is, the division time, and the product of an integer that is coprime to the division number and is greater than 3.

[0143] Thus, by using the conductivity information corresponding to the AC cycle having a number greater than or equal to an integer to be multiplied, even the measurement control device 120 operating at a low speed can accurately derive the conductivity.

[0144] In addition, mode (3-5) includes any one of modes (3-1) to (3-4), modes (1-1) to (1-6), and modes (2-1) to (2-3), wherein the concentration calculation unit 123 calculates the hypochlorous acid concentration using a waveform calculated based on the obtained conductivity information.

[0145] This makes it possible to measure the liquid resistance value relatively accurately using electrochemical impedance spectroscopy.

[0146] In addition, mode (3-6) includes any one of modes (3-1) to (3-4), modes (1-1) to (1-6), and modes (2-1) to (2-3), wherein the concentration calculation unit 123 calculates the hypochlorous acid concentration using the maximum value and the minimum value of the obtained conductivity information.

[0147] Thus, even the measurement control device 120 operating at a low speed can relatively easily measure the liquid resistance value by electrochemical impedance spectroscopy.

[0148] Mode (4-1) of the hypochlorous acid water generating device derived from the above-mentioned embodiment is a device in which the diffusion unit 240 is removed from the hypochlorous acid concentration measuring device 100, including any one of modes (1-1) to (1-6), modes (2-1) to (2-3), and modes (3-1) to (3-6), wherein the electrolysis control unit 251 obtains the hypochlorous acid concentration calculated by the concentration calculation unit 123, and controls the electrolysis device 230 based on the electrolysis information that the hypochlorous acid concentration in the electrolytic cell 210 reaches the target concentration.

[0149] Thus, the hypochlorous acid concentration calculated by the concentration calculation unit 123 can stably make the hypochlorous acid concentration in the electrolytic cell 210 the target concentration by using the electrolysis information related to the generated concentration of the generated hypochlorous acid.

[0150] In addition, mode (4-2) includes mode (4-1), wherein when the hypochlorous acid concentration calculated by the concentration calculation unit 123 is lower than the target concentration, the electrolysis control unit 251 calculates electrolysis information including at least one of the current value and the duration for the hypochlorous acid concentration to reach the target concentration.

[0151] Thus, the target concentration can be accurately achieved using the current value and duration, which are parameters that can be easily adjusted.

[0152] In addition, the aspect (4-3) includes the aspect (4-2), wherein the electrolysis control unit 251 divides the duration into a plurality of segments and calculates electrolysis information including the divided durations.

[0153] Thus, the electrolysis trend, that is, the increase in the concentration of hypochlorous acid caused by the current and the divided duration can be grasped by using the previous duration within the divided duration, and the result can be fed back to the next electrolysis.

[0154] In addition, the mode (4-4) includes the mode (4-2) or the mode (4-3), wherein the electrolysis control unit 251 calculates electrolysis information including interval information indicating a predetermined first time interval from the start of electrolysis corresponding to the acquired execution information to the execution of the next electrolysis.

[0155] Thus, by providing the first time interval, the life of the electrolytic electrode 220 can be prolonged.

[0156] In addition, the aspect (4-5) includes any one of the aspects (4-1) to (4-4), wherein the electrolysis control unit 251 calculates the electrolysis information based on the hypochlorous acid concentration before and after the electrolysis is performed.

[0157] This makes it possible to exclude parameters that affect the calculation of the hypochlorous acid concentration, such as the hardness of water, and calculate electrolysis information based on accurate hypochlorous acid concentration.

[0158] In addition, method (4-6) includes any one of methods (4-1) to (4-5), and when the hypochlorous acid concentration calculated by the concentration calculation unit 123 is higher than the target concentration, the electrolysis control unit 251 outputs to the measurement control device 120 measurement instruction information for performing conductivity information measurement after a prescribed second time has passed since the start of electrolysis corresponding to the execution information, obtains the hypochlorous acid concentration calculated by the concentration calculation unit 123 after the second time has passed, and controls the electrolysis device 230 based on the electrolysis information including the concentration decrease time when the hypochlorous acid concentration in the electrolytic cell 210 falls below the target concentration.

[0159] This makes it possible to stabilize the increase and decrease of the hypochlorous acid concentration in the electrolytic cell 210 within a narrow range. The concentration drop time below the target concentration may also be the time when the hypochlorous acid concentration reaches the lower limit threshold.

[0160] In addition, method (4-7) includes method (4-6), wherein the electrolysis control unit 251 outputs measurement instruction information to the measurement control device 120 to perform conductivity information measurement after a specified third time has passed since the second time has passed, obtains the hypochlorous acid concentration calculated by the concentration calculation unit 123 after the third time has passed, updates the concentration reduction time when the hypochlorous acid concentration in the electrolytic cell 210 is lower than the target concentration, and controls the electrolysis device 230 based on the electrolysis information including the updated concentration reduction time.

[0161] Thereby, the concentration reduction time can be derived more accurately, and the hypochlorous acid concentration can be kept constant.

[0162] Aspect (4-8) of the space sterilization device derived from the above-mentioned embodiment includes diffusion means 240 for diffusing the hypochlorous acid water generated by the hypochlorous acid water generating device of any one of aspects (4-1) to (4-7) into the atmosphere.

[0163] Thereby, at least hypochlorous acid in the hypochlorous acid water having a stable concentration can be diffused into the space, and the space sterilization effect can be stably exhibited.

[0164] Aspect (4-9) of the method for producing hypochlorous acid water derived from the above-mentioned embodiment is a method for producing hypochlorous acid water in a hypochlorous acid water producing device according to any one of aspects (4-1) to (4-7), wherein the measurement information acquisition unit 121 acquires conductivity information from the measuring unit 110, the conversion information acquisition unit 122 acquires conversion information indicating the relationship between the hypochlorous acid concentration and the conductivity information, the electrolysis execution acquisition unit 125 acquires execution information indicating the execution of electrolysis, and based on the execution information, when electrolysis is not performed, the measurement instruction unit 124 causes the measuring unit 110 to perform the measurement of the conductivity information, the concentration calculation unit 123 calculates the hypochlorous acid concentration based on the conductivity information and the conversion information measured before and after the electrolysis is performed, the hypochlorous acid concentration calculated by the concentration calculation unit 123 is acquired, and based on the electrolysis information indicating that the hypochlorous acid concentration in the electrolytic cell 210 has reached the target concentration, the electrolysis control unit controls the electrolysis device 230.

[0165] Thus, the hypochlorous acid concentration calculated by the concentration calculation unit 123 can be used to stably adjust the hypochlorous acid concentration in the electrolytic cell 210 to the target concentration using electrolysis information related to the generated concentration of the generated hypochlorous acid.

[0166] However, the present invention is not limited to the above-mentioned embodiments. For example, other embodiments achieved by arbitrarily combining the constituent elements described in this specification or excluding several constituent elements may also be used as embodiments of the present invention. In addition, within the scope of the present invention, within the meaning of the scope of the protection requested, the above-mentioned embodiments are subjected to various modifications that can be thought of by those skilled in the art. Modifications are also included in the present invention.

[0167] For example, in the above embodiment, the difference in liquid resistance (conductivity) is used to offset the difference in hardness component, but the hypochlorous acid concentration may be calculated from the liquid resistance (conductivity) instead of the difference. In this case, multiple conversion information corresponding to the difference in water hardness may be switched and applied.

[0168] In addition, the temperature correction may not be performed on the liquid resistance value (conductivity). In this case, the measurement unit 110 may not include the water temperature sensor 113, and may not acquire the correction information.

[0169] Furthermore, for example, by appropriately setting the gain in advance at the time of factory shipment, the measurement control device 120 may not need to perform gain adjustment.

[0170] In addition, by periodically replacing the measuring electrode 111 or the like, cleaning may not be necessary.

[0171] In addition, the main control device 250 and the measurement control device 120 are described as separate structures, but the main control device 250 and the measurement control device 120 may be integrated. That is, the main control device 250, the measurement control device 120, and the electrolysis control unit 251 may be controlled by a single processor executing a program.

[0172] Furthermore, although the case where the hypochlorous acid concentration measuring device 100 is used in the space sterilizing device 200 has been described, the hypochlorous acid concentration measuring device 100 may also be applied to a hypochlorous acid water generating device.

[0173] Furthermore, the conversion information and the correction information may not be stored in the storage device 102 included in the measurement control device 120 but may be acquired through communication such as a network.

[0174] In addition, the measurement information acquisition unit 121 may detect the deviation of the acquisition cycle 302 relative to the AC cycle 300 applied by the measurement device 112 based on a plurality of conductivity information (e.g., in-phase conductivity information) assumed to have the same value within the AC cycle 300, and update the acquisition cycle 302 based on the detected deviation to make it correspond to the actual AC cycle. Specifically, Fig.13 As shown in the upper graph of , first, in the pre-alternating cycle 310 for determining the acquisition cycle 302, it is assumed that the 0 point and the 10 point of the same phase are the same value (zero). However, the value 311 of the conductivity information acquired sometimes deviates. When the difference 303 between the value of the conductivity information assumed in advance and the value of the conductivity information actually obtained is greater than the threshold value, the measurement information acquisition unit 121 detects that a deviation has occurred. Then, based on the difference 303, the measurement information acquisition unit 121 can detect that a deviation has occurred. Fig.13 The graph in the lower section shows that the acquisition period 302 is updated so that the values ​​of the same phase are the same value (zero).

[0175] In addition, the timing of the update process of the acquisition cycle 302 is not limited, and it can be Figure 6 The updating process is performed in a calibrated manner before obtaining the conductivity information for the initial measurement of the liquid resistance value (S104) during the generation period shown in the flowchart of the present invention, or before obtaining the conductivity information for the measurement of the liquid resistance value (S203) during the decay period. Alternatively, the updating process may be performed each time the conductivity information for measuring the liquid resistance value is obtained, or every predetermined number of times.

[0176] Description of Reference Numerals

[0177] 100: hypochlorous acid concentration measuring device; 102: storage device; 110: measuring unit; 111: measuring electrode; 112: applying measuring device; 113: water temperature sensor; 120: measuring control device; 121: measuring information acquisition unit; 122: conversion information acquisition unit; 123: concentration calculation unit; 124: measuring instruction unit; 125: electrolysis execution acquisition unit; 126: correction information acquisition unit; 127: measuring adjustment unit; 128: cleaning unit ; 131: AC power supply device; 132: liquid resistance value measuring device; 200: space sterilization device; 210: electrolytic cell; 220: electrolytic electrode; 230: electrolytic device; 240: diffusion unit; 250: main control device; 251: electrolysis control unit; 260 water level sensor; 300: AC cycle; 301: division time; 302: acquisition cycle; 303: difference; 310: prior AC cycle; 311: value of conductivity information.

Claims

1. A hypochlorous acid concentration measuring device for measuring the concentration of hypochlorous acid generated by electrolyzing chlorine-containing water stored in an electrolytic cell, the hypochlorous acid concentration measuring device comprising: a measuring unit for measuring conductivity information indicating the conductivity of the hypochlorous acid water stored in the electrolytic cell; and a measurement control device for controlling the measurement unit, The measurement control device comprises: a measurement information acquisition unit that acquires conductivity information from the measurement unit; a conversion information acquisition unit that acquires conversion information indicating a relationship between a hypochlorous acid concentration and the conductivity information; and A concentration calculating unit calculates the concentration of hypochlorous acid based on the measured conductivity information and the conversion information.

2. The hypochlorous acid concentration measuring device according to claim 1, characterized in that: The measurement control device comprises: an electrolysis execution acquisition unit that acquires execution information indicating that electrolysis has been executed; and a measurement instruction section for causing the measurement unit to perform conductivity information measurement when electrolysis is not performed based on the execution information; The concentration calculation unit calculates a difference in hypochlorous acid concentration using conductivity information measured before and after electrolysis.

3. The hypochlorous acid concentration measuring device according to claim 1, characterized in that: The measuring unit comprises: A pair of measuring electrodes arranged in isolation in the hypochlorous acid water stored in the electrolytic cell; A measuring device for applying an AC voltage selected from a range of 1 kHz to 100 kHz between the pair of measuring electrodes; and a liquid resistance value measuring device for measuring the liquid resistance value between the measuring electrodes as conductivity information, The concentration calculation unit calculates the hypochlorous acid concentration based on the measured liquid resistance value.

4. The hypochlorous acid concentration measuring device according to claim 1, characterized in that: The measuring unit includes a water temperature sensor for measuring temperature information indicating the temperature of water stored in the electrolytic cell. The measurement control device includes a correction information acquisition unit that acquires correction information indicating temperature correction when calculating the hypochlorous acid concentration from the measured conductivity information. The concentration calculation unit calculates the hypochlorous acid concentration by performing correction based on the temperature information acquired by the measurement information acquisition unit and the correction information.

5. The hypochlorous acid concentration measuring device according to claim 3, characterized in that: The measurement control device includes a measurement adjustment unit that adjusts at least one of an output power of the application measurement device and a gain of the liquid resistance value measurement device so that the conductivity information measured by the measurement unit falls within a predetermined range.

6. The hypochlorous acid concentration measuring device according to claim 1, characterized in that: The measuring unit comprises: A pair of measuring electrodes arranged in isolation in the hypochlorous acid water stored in the electrolytic cell; and an application and measurement device for applying an AC voltage or an AC current of a predetermined AC cycle between a pair of the measurement electrodes; The measurement information acquisition unit acquires the conductivity information from the measurement unit at an acquisition cycle slower than a time resolution of the measurement unit. The concentration calculation unit calculates the hypochlorous acid concentration based on the conductivity information corresponding to a plurality of cycles of the AC cycle and the conversion information.

7. The hypochlorous acid concentration measuring device according to claim 6, characterized in that: The measuring unit includes a liquid resistance value measuring device for measuring the liquid resistance value between the measuring electrodes as conductivity information. The concentration calculation unit calculates the hypochlorous acid concentration based on the measured liquid resistance value.

8. The hypochlorous acid concentration measuring device according to claim 7, characterized in that: The applying and measuring device applies an AC voltage or an AC current between the pair of measuring electrodes at a frequency at which the liquid resistance value measured by the liquid resistance value measuring device does not have an imaginary component.

9. The hypochlorous acid concentration measuring device according to claim 1, characterized in that: The measurement control device comprises: an electrolysis execution acquisition unit that acquires execution information indicating that electrolysis has been executed; and a measurement instruction section for causing the measurement unit to perform conductivity information measurement when electrolysis is not performed based on the execution information; The measurement instructing unit repeatedly performs the measurement of the conductivity information at a predetermined interval during the decay period when the electrolysis is not performed after the electrolysis is performed during the generation period of hypochlorous acid. The concentration calculation unit calculates each hypochlorous acid concentration based on the plurality of measured conductivity information.

10. The hypochlorous acid concentration measuring device according to claim 9, characterized in that: The conversion information acquisition unit acquires decay period conversion information, which is different from the generation period conversion information used as the conversion information for the generation period of hypochlorous acid and is the conversion information used for the decay period of hypochlorous acid. The concentration calculation unit calculates the hypochlorous acid concentration based on the measured conductivity information and the decay period conversion information.

11. The hypochlorous acid concentration measuring device according to claim 9, characterized in that: The measurement control device comprises: an electrolysis execution acquisition unit that acquires execution information indicating that electrolysis has been executed; and a measurement instruction section for causing the measurement unit to perform conductivity information measurement when electrolysis is not performed based on the execution information; The concentration calculation unit calculates the absolute value of the hypochlorous acid concentration based on: the hypochlorous acid concentration calculated based on the difference between the front conductivity information, which is the conductivity information measured before the electrolysis is performed, and the last rear conductivity information in the generation period, which is the conductivity information measured after the electrolysis is performed; and the conductivity information measured after the rear conductivity information in the generation period within the decay period using the rear conductivity information as a reference; and the calculated hypochlorous acid concentration information.

12. A hypochlorous acid water generating device, characterized in that: include: Electrolyzers for storing chlorinated water; an electrolytic electrode arranged in an inserted state in the electrolytic cell; An electrolysis device for applying voltage to the electrolysis electrodes to electrolyze the chlorine-containing water to produce hypochlorous acid water; The hypochlorous acid concentration measuring device according to claim 1; and a main control device for controlling the electrolysis device, The measurement control device comprises: an electrolysis execution acquisition unit that acquires execution information indicating that electrolysis has been executed; and a measurement instruction section for causing the measurement unit to perform conductivity information measurement when electrolysis is not performed based on the execution information; The concentration calculation unit calculates the hypochlorous acid concentration based on the conductivity information measured before and after the electrolysis and the conversion information. The main control device includes an electrolysis control unit that outputs electrolysis information indicating that the hypochlorous acid concentration in the electrolytic cell reaches a target concentration to the electrolysis device based on information on the hypochlorous acid concentration calculated by the concentration calculation unit.

13. The hypochlorous acid water generating device according to claim 12, characterized in that: The main control device includes an execution information acquisition unit that acquires execution information. When the hypochlorous acid concentration calculated by the concentration calculation unit is lower than the target concentration, the electrolysis control unit calculates electrolysis information including at least one of the current value and the duration for the concentration of hypochlorous acid to reach the target concentration based on the current value and the duration during the electrolysis execution included in the execution information.

14. The hypochlorous acid water generating device according to claim 12, characterized in that: The main control device includes an execution information acquisition unit that acquires execution information. When the hypochlorous acid concentration calculated by the concentration calculation unit is higher than the target concentration, the electrolysis control unit outputs measurement instruction information for executing conductivity information measurement after a prescribed second time has passed since the start of electrolysis corresponding to the execution information to the measurement control device, and outputs electrolysis information including a concentration reduction time during which the concentration of hypochlorous acid in the electrolytic cell becomes lower than the target concentration based on the information on the hypochlorous acid concentration calculated by the concentration calculation unit after the second time has passed to the electrolysis device.

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