Electrolytic water generator and electrolytic water generation method

Abstract

To provide an electrolytic water generator capable of enhancing a response to fluctuations in the flow rate of main water.SOLUTION: An electrolytic water generator 1 includes a control unit 7, a DC power supply 3 that is signal connected to the control unit 7 and energizes a raw material solution 43, a flow meter 2b that is signal connected to the control unit 7 and detects the flow rate R of the main water 33, a non-diaphragm electrolytic cell 4 that generates a generating body 44 by electrolysis of the raw material solution 43 through electrification from the DC power supply 3, and an electrolytic water generation unit 19 that generates slightly acidic electrolytic water 45 by merging the generation body 44 with the main water 33. The control unit 7 sets a command current value I1 necessary to meet a target chlorine concentration value C1 within a specified value in the slightly acidic electrolytic water 45 according to the flow rate R, sets the feed rate of the raw material solution 43 based on the flow rate R and the command current value I1, and adjusts a voltage value V of the DC power supply 3 to meet the chlorine concentration target value C1 based on the flow rate R and the measured current value I2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an apparatus and method for producing slightly acidic electrolyzed water. [Background technology]

[0002] Slightly acidic electrolyzed water (slightly acidic hypochlorous acid water) is known, which is prepared by mixing a product (chlorine gas or hypochlorous acid) produced by electrolyzing a raw material solution of hydrochloric acid or a hydrochloric acid + sodium chloride aqueous solution with water and adjusting the hydrogen ion exponent (pH) to 5.0 to 6.5 and the chlorine concentration to 10 to 80 ppm. Slightly acidic electrolyzed water is used for sterilization and cleaning of food materials and food processing equipment that require sanitary management, and various efforts have been made to stably produce slightly acidic electrolyzed water (Patent Document 1: JP 2011-104519 A, Patent Document 2: JP 2019-093327 A). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-104519 A [Patent Document 2] JP 2019-093327 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the electrolytic cell, electrolysis is performed while the voltage value, the current value, and the supply amount of the raw material solution influence each other. The electrolytic water generating device described in Patent Document 1 controls the voltage value at a constant value, so when the supply amount of the raw material solution fluctuates, the current value changes slowly, and the response to the flow rate fluctuation of the main water is poor. The electrolytic water generating device described in Patent Document 2 controls the voltage value and the current value according to the supply amount of the raw material solution, and it is difficult to respond to the flow rate fluctuation of the main water. In these devices using the conventional technology, a storage tank for storing the generated slightly acidic electrolytic water and a discharge pump for discharging the stored slightly acidic electrolytic water are attached in order to respond to the increase and decrease in the amount of the slightly acidic electrolytic water used. Therefore, it was necessary to secure a large installation area in which the storage tank and the discharge pump can be installed in addition to the electrolytic water generating device. As a solution to these problems, for example, a method of adjusting the voltage value by keeping the current value constant is considered. However, there is a new problem that the current value and voltage value required to make the chlorine concentration conform to the specified value fluctuate due to the fluctuation in the flow rate of the main water, and the electrolysis efficiency also fluctuates, resulting in an unstable chlorine concentration. [Means for solving the problem]

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide an electrolytic water generating device that can improve responsiveness to fluctuations in the flow rate of the main water, and an electrolytic water generating method that can improve responsiveness to fluctuations in the flow rate of the main water.

[0006] In one embodiment, the above problem is solved by the solution disclosed below.

[0007] The electrolytic water generating device according to the present invention includes a control unit, a DC power supply connected to the control unit for supplying electricity to a raw material liquid, a flowmeter connected to the control unit for detecting a flow rate of main water, a first pipe for supplying raw water, a raw material tank for storing raw materials including hydrochloric acid, a raw material liquid generating unit for generating the raw material liquid by merging the raw materials with branched water branched from the raw water, a second pipe connected to the raw material liquid generating unit for supplying the raw material liquid, a membrane-free electrolytic cell for electrolyzing the raw material liquid by supplying electricity from the DC power supply to generate a product, and the membrane-free electrolytic cell and a third pipe connected to the first pipe for sending the product, and an electrolyzed water generating unit for generating slightly acidic electrolyzed water by merging the product with the main water after the branch water branches off from the raw water, and the control unit is configured to set a command current value required to match a target chlorine concentration value within a range of specified values ​​in the slightly acidic electrolyzed water according to the flow rate, set a supply amount of the raw material liquid based on the flow rate and the command current value, and adjust a voltage value of the DC power source to match the target chlorine concentration value based on the flow rate and an actual measured current value.

[0008] According to this configuration, the control unit can quickly adjust the chlorine concentration to the target value within the range of 10 to 80 ppm, which is the specified value, and therefore the responsiveness to the flow rate fluctuation of the main water can be improved. In addition, by improving the responsiveness to the flow rate fluctuation, it is possible to omit the storage tank for storing the generated slightly acidic electrolyzed water and the discharge pump for discharging the stored slightly acidic electrolyzed water. This allows for a compact, space-saving, and easy-to-use configuration.

[0009] The target value of the chlorine concentration is set within a range of 10 to 80 ppm. As an example, the target value of the chlorine concentration is set within a range of 20 to 70 ppm.

[0010] As an example, the control unit is configured to calculate an electrolysis efficiency based on the voltage value, calculate a chlorine concentration calculation value based on the flow rate, the electrolysis efficiency, and the measured current value, and adjust the voltage value so that the chlorine concentration calculation value matches the chlorine concentration target value. With this configuration, the chlorine concentration calculation value can be used to quickly match the chlorine concentration target value. In addition, by using the chlorine concentration calculation value, a chlorine concentration meter for measuring the chlorine concentration can be omitted. Therefore, a simple and easy-to-use configuration can be achieved.

[0011] As an example, the apparatus includes a first pump for delivering the branched water, a second pump for delivering the raw material, and an adjustment unit that allows an operator to set the chlorine concentration target value within a range that matches the specified value of 10 to 80 ppm, and the control unit sets the chlorine concentration target value based on the adjustment value of the adjustment unit, and controls the drive of the first pump and the second pump to adjust the supply amount of the raw material liquid. According to this configuration, the supply amount of the raw material can be easily controlled with high accuracy, so that the desired chlorine concentration can be quickly achieved.

[0012] As an example, the control unit is configured to calculate the electrolysis efficiency using equation 1 (where a and b are constants) into which the voltage value is substituted, calculate the command current value using equation 2 into which the flow rate, the electrolysis efficiency, and the target chlorine concentration value are substituted, calculate the calculated chlorine concentration value using equation 3 into which the flow rate, the electrolysis efficiency, and the measured current value are substituted, and adjust the voltage value so that the calculated chlorine concentration value matches the target chlorine concentration value.

[0013]

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[0014]

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[0015]

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[0016] The inventors of the present application have found that, from the relationship between the voltage value V and the electrolysis efficiency η in a membrane-less electrolytic cell described below, the electrolysis efficiency η tends to be negatively proportional to the voltage value V. According to the above-mentioned formula 1, the electrolysis efficiency η can be calculated by inputting the voltage value V as data. Here, the symbols a and b in the above-mentioned formula 1 are both constants based on implementation data for obtaining the relational expression between the electrolysis efficiency η and the voltage value V.

[0017] The amount of chlorine gas and hypochlorous acid generated in the electrolytic cell follows Faraday's law of electrolysis. According to the above formula 2, the flow rate R, electrolysis efficiency η, and chlorine concentration target value C 1 By inputting the data, the command current value I 1 According to the above-mentioned formula 3, the flow rate R, the electrolysis efficiency η, and the measured current value I 2 By inputting the data, the chlorine concentration calculation value C 2 Here, in the above-mentioned Equation 2 and Equation 3, the value "52.5" is the molecular weight of hypochlorous acid (HOCL), and the value "96485" is the Faraday constant.

[0018] The electrolyzed water generating method according to the present invention is characterized in that, using an electrolyzed water generating device including a control unit, a DC power supply connected to the control unit to supply current to the raw material solution, a flowmeter connected to the control unit to detect the flow rate of the main water, a raw material tank for storing raw materials including hydrochloric acid, a raw material solution generating unit for generating the raw material solution by merging the raw material with branched water branched from raw water, a membrane-less electrolytic cell for generating a product by electrolyzing the raw material solution by current from the DC power supply, and an electrolyzed water generating unit for generating slightly acidic electrolyzed water by merging the product with the main water after the branched water is branched from the raw water, the control unit sets a command current value required to match the chlorine concentration target value within a range of a specified value in the slightly acidic electrolyzed water according to the flow rate, sets the supply amount of the raw material solution based on the flow rate and the command current value, and adjusts the voltage value of the DC power supply so as to match the chlorine concentration target value based on the flow rate and the actual measured current value.

[0019] According to this configuration, the control unit can quickly adjust the chlorine concentration to the target value within the range of 10 to 80 ppm, which is the specified value, and therefore the responsiveness to the flow rate fluctuation of the main water can be improved. In addition, by improving the responsiveness to the flow rate fluctuation, it is possible to omit the storage tank for storing the generated slightly acidic electrolyzed water and the discharge pump for discharging the stored slightly acidic electrolyzed water. This allows for a compact, space-saving, and easy-to-use configuration. Effect of the Invention

[0020] According to the present invention, it is possible to improve the responsiveness to the main water flow rate fluctuation by determining whether the calculated chlorine concentration value is appropriate based on the target chlorine concentration value and controlling the voltage value. Then, it is possible to stabilize the chlorine concentration by repeating a predetermined control flow. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic circuit diagram showing an example of the circuit configuration of an electrolytic water generating device according to this embodiment. [Diagram 2] FIG. 2 is a schematic perspective view showing an example of the appearance of the electrolyzed water generating device according to this embodiment. [Diagram 3] FIG. 3 is a schematic flow chart showing an example of the procedure for producing slightly acidic electrolyzed water according to this embodiment. [Figure 4] FIG. 4 is a graph showing the relationship between the voltage value and the electrolysis efficiency in a diaphragm-free electrolytic cell. [Diagram 5] FIG. 5 is a graph showing the responsiveness of the actually measured current value to the time variation of the flow rate in the example. [Figure 6] FIG. 6 is a graph showing the responsiveness of the measured current value to the time variation of the flow rate in the comparative example. [Figure 7] FIG. 7 is a graph showing the stability of the concentration of generated chlorine in the examples and the comparative examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic circuit diagram showing an example of the circuit configuration of an electrolytic water generating device 1 according to this embodiment. The dashed line in the figure indicates a housing 2. In the electrolytic water generating device 1, a water supply port 9a for supplying raw water 31 from a water source 30 is arranged on the upstream side, and a water outlet 9b for discharging the generated slightly acidic electrolytic water 45 is arranged on the downstream side. As an example, a manual valve 29 is arranged on the upstream side of the water supply port 9a, and a pressure reducing valve 23 is arranged on the downstream side of the water supply port 9a. An operator manually opens and closes the manual valve 29 to adjust the flow rate of the raw water 31. In addition to the above configuration, for example, a configuration in which the manual valve 29 is arranged on the downstream side of the water outlet 9b may be used. Also, for example, an electromagnetic flow control valve may be used instead of the manual valve 29. In addition, in all the drawings for explaining the embodiment, members having the same function are given the same reference numerals, and repeated explanations thereof may be omitted.

[0023] The electrolytic water generating device 1 has a control unit 7, a flowmeter 2b connected to the control unit 7 by signals, an adjustment unit 2a and a display unit 25 connected to the control unit 7 by signals, a first pump 21 and a second pump 22 connected to the control unit 7 by signals, and a DC power supply 3 connected to the control unit 7 by signals. A voltmeter 3a and an ammeter 3b are disposed on the output side of the DC power supply 3. The dashed lines in the figure indicate the connections of the electrical signals. As an example, the control unit 7 is a CPU consisting of a one-chip microcomputer. The adjustment unit 2a controls the chlorine concentration C in the slightly acidic electrolytic water 45 so that the operator can adjust the chlorine concentration C to a target chlorine concentration value C within a range conforming to the specified value of 10 to 80 ppm. 1 The display unit 25 displays the target chlorine concentration value C 1 The display unit 25 displays the setting conditions including the above. As an example, the display unit 25 is a liquid crystal display panel. In addition to the above configuration, for example, a touch panel that has the functions of both the adjustment unit 2a and the display unit 25 and is capable of inputting and outputting data may be used.

[0024] The control unit 7 calculates the chlorine concentration target value C based on the adjustment value of the adjustment unit 2a. 1 Then, the chlorine concentration target value C is set within the range of the specified value in the slightly acidic electrolyzed water 45. 1 The command current I required to match1 is set according to the flow rate R, and the command current value I 1 The control unit 7 adjusts the voltage value V of the DC power source 3 based on the flow rate R and the command current value I 1 Based on this, the amount of raw material solution 43 supplied to the membrane-less electrolytic cell 4 is adjusted. The control unit 7 controls the driving of the first pump 21 and the second pump 22 to adjust the amount of raw material solution 43 supplied.

[0025] The electrolyzed water generator 1 has a raw material tank 41 that stores raw material 42, the main raw material of which is hydrochloric acid, and a membrane-less electrolytic cell 4 that generates a product 44 by electrolyzing a raw material solution 43 by passing electricity from a DC power source 3. In the membrane-less electrolytic cell 4, an anode 4a and a cathode 4b are disposed in the liquid at a predetermined interval.

[0026] The electrolytic water generator 1 has a first pipe 11, a branch pipe 11a, a second pipe 12, a third pipe 13, and a fourth pipe 14, as well as a branch section 17, a raw material liquid generator 18, and an electrolytic water generator 19. The first pipe 11 is connected to a water supply port 9a via a pressure reducing valve 23 to deliver raw water 31. The branch pipe 11a is connected to the branch section 17 to deliver branched water 32. The second pipe 12 is connected to the raw material liquid generator 18 to deliver raw material liquid 43. The third pipe 13 is connected to the electrolytic water generator 19 to deliver a product 44. The fourth pipe 14 is connected to the raw material liquid generator 18 to deliver raw material 42. In the first pipe 11, a flowmeter 2b is arranged downstream of the branching section 17, a check valve 24 is arranged downstream of the flowmeter 2b, an electrolytic water generating section 19 is arranged downstream of the check valve 24, and a water outlet 9b is arranged downstream of the electrolytic water generating section 19. The branching section 17 branches the raw water 31 into the main water 33 and the branched water 32. The raw material solution generating section 18 generates the raw material solution 43 by merging the raw material 42 with the branched water 32 and mixing them. The electrolytic water generating section 19 generates the slightly acidic electrolytic water 45 by merging the product 44 with the main water 33 and mixing them. The white arrow in the figure indicates the direction of movement of the liquid. The product 44 is chlorine gas or hypochlorous acid generated by electrolysis in the membraneless electrolytic cell 4.

[0027] FIG. 2 is a schematic perspective view showing an example of the appearance of the electrolytic water generating device 1. In the example of FIG. 2, the electrolytic water generating device 1 has an adjustment unit 2a and a display unit 25 arranged on the front side, and a main power supply 26 arranged on the side. The electrolytic water generating device 1 has a box-shaped housing 2, and a water supply port 9a and a water outlet 9b are arranged at a predetermined interval on the lower side of the front side of the housing 2. As an example, the electrolytic water generating device 1 is configured to be able to discharge slightly acidic electrolytic water 45 from the water outlet 9b at a flow rate R of 2 to 18 liters per minute. With this configuration, it is possible to omit the storage tank for slightly acidic electrolytic water and the water supply pump that were attached to the conventional device, so that it can be configured to be small, space-saving, and easy to use. In addition, it is possible to omit the storage tank for slightly acidic electrolytic water and the water supply pump that were attached to the conventional device, so that it is possible to significantly reduce costs.

[0028] As an example, the adjustment unit 2a adjusts the chlorine concentration target value C 1 and a target value for hydrogen ion exponent (pH) can be set. As an example, the control unit 7 adjusts the rotation speed of the second pump 22 stepwise based on the adjustment value of the adjustment unit 2a to adjust the slightly acidic electrolyzed water 45 to a chlorine concentration of 10 to 80 ppm and a pH of 5.0 to 6.5. The electrolyzed water generator 1 can also be configured to change the hydrochloric acid concentration in the raw material 42 or add salt to the raw material 42 depending on the quality of the raw water 31.

[0029] Next, the electrolytic water generating method according to the present invention will be described below.

[0030] 3 is a schematic flow chart showing an example of a procedure for generating the slightly acidic electrolyzed water 45 according to this embodiment. The operator turns on the main power supply 26 of the electrolyzed water generating device 1 and opens the manual valve 29 to adjust the flow rate of the raw water 31. When the manual valve 29 is opened, the flow meter 2b detects the flow rate R of the main water 33. The operator adjusts or inputs the adjustment value of the adjustment unit 2a to obtain the target chlorine concentration value C 1 The operator sets the chlorine concentration target value C 1 When the above steps are set and started, the control unit 7 performs control operations to generate the slightly acidic electrolyzed water 45 by transitioning in the order of step S1, step S2, . . . , step S8.

[0031] Fig. 4 is a graph showing the relationship between the voltage value V and the electrolysis efficiency η in the diaphragm-less electrolytic cell 4. From the results of the implementation data shown in Fig. 4, the inventors of the present application found that the electrolysis efficiency η tends to be negatively proportional to the voltage value V, and derived the above-mentioned formula 1. According to the above-mentioned formula 1, the electrolysis efficiency η can be calculated by inputting the voltage value V as data.

[0032] The amount of chlorine gas and hypochlorous acid generated in the membraneless electrolytic cell 4 follows Faraday's law of electrolysis. According to the above-mentioned formula 2 based on Faraday's law of electrolysis, the flow rate R, the electrolysis efficiency η, and the chlorine concentration target value C 1 By inputting the data, the command current value I 1 According to the above-mentioned formula 3, the flow rate R, the electrolysis efficiency η, and the measured current value I 2 By inputting the data, the chlorine concentration calculation value C 2 can be calculated.

[0033] The chlorine concentration target value C is set by the operator. 1 When the flow rate R of the main water 33 is set and started, in step S1, the control unit 7 judges whether or not the flow rate R of the main water 33 is detected. If the flow rate R is detected, the process proceeds to step S2. If the flow rate R is not detected, the control unit 7 waits for a certain period of time and then ends the control operation.

[0034] In step S2, the control unit 7 transmits a command to the DC power supply 3, and the DC power supply 3, upon receiving the command, energizes at a standard voltage or an initial voltage to start electrolysis of the raw material liquid 43. When electrolysis of the raw material liquid 43 starts, the process proceeds to step S3.

[0035] In step S3, the control unit 7 calculates the electrolysis efficiency η based on the voltage value V measured by the voltmeter 3a using the above-mentioned formula 1. Next, using the above-mentioned formula 2, the flow rate R measured by the flowmeter 2b, the calculated electrolysis efficiency η, and the chlorine concentration target value C 1 Based on the command current value I 1 Calculate the command current value I 1Once calculated, the process proceeds to step S4.

[0036] In step S4, the control unit 7 calculates the flow rate R and the command current value I 1 After the supply amount of the raw material liquid 43 is set, the process proceeds to step S5.

[0037] In step S5, the control unit 7 judges whether the supply amount of the raw material liquid 43 is appropriate. If the control unit 7 judges that the supply amount of the raw material liquid 43 is not appropriate, the process proceeds to step S5A. In step S5A, the control unit 7 adjusts the supply amount of the raw material liquid 43 by controlling the drive of the first pump 21 and the second pump 22, and returns to step S5. In step S5, if the control unit 7 judges that the supply amount of the raw material liquid 43 is appropriate, the process proceeds to step S6. Since the flow rate R changes from moment to moment, the chlorine concentration can be stabilized by repeating the control flow shown in FIG. 3.

[0038] In step S6, the control unit 7 calculates the flow rate R, the electrolysis efficiency η, and the actual current value I measured by the ammeter 3b using the above-mentioned formula 3. 2 Based on the chlorine concentration calculation value C 2 Calculate the chlorine concentration value C 2 Once calculated, the process proceeds to step S7.

[0039] In step S7, the control unit 7 calculates the chlorine concentration C 2 The control unit 7 judges whether the calculated chlorine concentration value C 2 If it is determined that the chlorine concentration calculation value C is not appropriate, the process proceeds to step S7A. In step S7A, the control unit 7 adjusts the voltage value V. After adjusting the voltage value V, the process returns to step S7. 2 If it is determined that the command current value I is appropriate, the process proceeds to step S8. 1 changes from moment to moment according to the fluctuation of the flow rate R. On the other hand, the chlorine concentration target value C 1 is a fixed value set by the operator. Therefore, the chlorine concentration target value C 1 Based on this, the chlorine concentration is calculated as C 2The control flow shown in FIG. 3 is repeated to stabilize the chlorine concentration.

[0040] In step S8, the control unit 7 determines whether or not the flow rate R has changed. If the control unit 7 determines that the flow rate R has changed, the process returns to step S3. If the control unit 7 determines that the flow rate R has not changed, the process returns to step S6.

[0041] In the above-mentioned step S5A, the control unit 7 adjusts the supply amount of the raw material solution 43, so that the conductivity of the electrolytic solution in the membraneless electrolytic cell 4 gradually changes. 2 is the chlorine concentration target value C 1 The voltage V is adjusted to match the target chlorine concentration C 1 By repeating the above-mentioned control flow, the chlorine concentration of the slightly acidic electrolyzed water 45 can be stabilized against fluctuations in the flow rate R.

[0042] Next, examples and comparative examples of the electrolyzed water generating device 1 according to the present invention will be described below.

[0043] [Example] The electrolytic water generating device 1 of the embodiment uses tap water as raw water 31 and has a chlorine concentration target value C 1 The above-mentioned control flow was repeated to generate slightly acidic electrolyzed water 45.

[0044] FIG. 5 shows the actual current value I versus time variation of the flow rate R in the embodiment. 2 FIG. 1 is a graph showing the tracking ability of the command current value I 1 and the measured current value I 2 The command current I 1 The actual current value I 2 In step S7, the control unit 7 determines the chlorine concentration target value C 1 Based on this, the chlorine concentration is calculated as C 2is appropriate and the voltage value V is adjusted accordingly. 1 Based on the actual measured current value I 2 is appropriate, and it can be determined that the same results have been obtained as in the control of adjusting the voltage value V, and the chlorine concentration can be stabilized by repeating the above-mentioned control flow.

[0045] [Comparative Example] The electrolytic water generating device of the comparative example used the same tap water as the example as the raw water, set the chlorine concentration target value to 35 ppm, set the command voltage value to perform constant voltage control, and generated slightly acidic electrolytic water.

[0046] 6 is a graph showing the response of the measured current value to the time variation of the flow rate in the comparative example. It was confirmed that the measured current value had a time lag with respect to the theoretical current value, and the change was gradual, and the responsiveness to the time variation of the flow rate was poorer than in the example.

[0047] [Comparison of chlorine concentration] FIG. 7 is a graph showing the stability of the generated chlorine concentration in the embodiment and the comparative example in comparison. The vertical axis of the graph is the chlorine concentration. The horizontal axis of the graph is time, and time passes in the order of observation point P1, observation point P2, observation point P3, and observation point P4. In FIG. 7, the flow rate at observation point P1 5 seconds before the flow rate increases is 8 liters per minute. After that, the flow rate at observation point P2 10 seconds after the flow rate increases is 16 liters per minute. After that, the flow rate at observation point P3 5 seconds before the flow rate decreases is 16 liters per minute. After that, the flow rate at observation point P4 10 seconds after the flow rate decreases is 8 liters per minute.

[0048] 7, the chlorine concentration in the embodiment is 31 to 40 ppm, and the fluctuation range is small. On the other hand, the chlorine concentration in the comparative example is 26 to 78 ppm, and the fluctuation range is large. Therefore, it was confirmed that the embodiment has a better stability of the chlorine concentration against the flow rate fluctuation than the comparative example.

[0049] According to the above-described embodiment, the operator can set any chlorine concentration target value C within the range of the specified chlorine concentration of 10 to 80 ppm. 1 The present invention is not limited to the above-described embodiment, and can be set, for example, as the chlorine concentration target value C 1 It is also possible to have a simplified configuration in which the above-mentioned flow rate is preset. For example, the water discharge flow rate can be set to 18 liters per minute or more. Alternatively, the water discharge flow rate can be set to 2 liters per minute or less. The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. [Explanation of symbols]

[0050] 1 Electrolyzed water generator 2 housing, 2a adjustment section, 2b flowmeter 3 DC power supply, 3a voltmeter, 3b ammeter 4 Non-diaphragm electrolytic cell, 4a anode, 4b cathode 7 Control section 9a Water inlet, 9b Water outlet 11 First pipe, 11a Branch pipe 12 2nd pipe 13 3rd tube 14 4th tube 17 Branch 18 Raw material liquid generation section 19 Electrolyzed water generation section 21 First Pump 22 Second Pump 23 Pressure reducing valve 24 Check valve 25 Display section 26 Main power supply 29 Manual Valve 30 Water source 31 Raw water 32 Branch Water 33 Main 41 Raw material tank 42 Raw materials 43 Raw material liquid 44 Generator 45 Slightly acidic electrolyzed water C 1 Chlorine concentration target value C2 Calculated chlorine concentration I 1 Command current value I 2 Actual current value R flow rate V Voltage value η Electrolysis efficiency

Claims

1. The electrolytic water generating unit includes a control unit, a DC power source connected to the control unit to supply electricity to the raw material liquid, a flowmeter connected to the control unit to detect the flow rate of the main water, a first pipe for supplying raw water, a raw material tank for storing raw materials including hydrochloric acid, a raw material liquid generating unit for generating the raw material liquid by merging the raw materials with branched water branched from the raw water, a second pipe connected to the raw material liquid generating unit for supplying the raw material liquid, a membrane-free electrolytic cell for generating a product by electrolyzing the raw material liquid by applying electricity from the DC power source, a third pipe connected to the membrane-free electrolytic cell for supplying the product, and an electrolytic water generating unit for generating slightly acidic electrolytic water by merging the product with the main water after the branched water is branched from the raw water, The control unit is configured to set a command current value required to match the chlorine concentration target value within a range of specified values ​​in the slightly acidic electrolyzed water according to the flow rate, set a supply amount of the raw material solution based on the flow rate and the command current value, and adjust a voltage value of the DC power source so as to match the chlorine concentration target value based on the flow rate and an actually measured current value. An electrolytic water generating device characterized by the above.

2. The control unit is configured to calculate an electrolysis efficiency based on the voltage value, calculate a calculated chlorine concentration value based on the flow rate, the electrolysis efficiency, and the measured current value, and adjust the voltage value so that the calculated chlorine concentration value matches the target chlorine concentration value. The electrolytic water generating device according to claim 1 .

3. The apparatus includes a first pump for delivering the branched water, a second pump for delivering the raw material, and an adjustment unit that allows an operator to set the chlorine concentration target value within a range that conforms to the specified value of 10 to 80 ppm; The control unit is configured to set the target chlorine concentration value based on the adjustment value of the adjustment unit, and to adjust the supply amount of the raw material liquid by driving and controlling the first pump and the second pump. The electrolytic water generating device according to claim 2 .

4. the control unit is configured to calculate the electrolysis efficiency by equation 1 (where a and b are constants) into which the voltage value is substituted, calculate the command current value by equation 2 into which the flow rate, the electrolysis efficiency, and the target chlorine concentration value are substituted, calculate the calculated chlorine concentration value by equation 3 into which the flow rate, the electrolysis efficiency, and the actually measured current value are substituted, and adjust the voltage value so that the calculated chlorine concentration value matches the target chlorine concentration value. The electrolytic water generating device according to claim 2 or 3, [0010] [0025] [0030]

5. an electrolyzed water generating device including a control unit, a DC power supply connected to the control unit by signals to pass electricity through the raw material liquid, a flowmeter connected to the control unit by signals to detect the flow rate of the main water, a raw material tank for storing raw materials including hydrochloric acid, a raw material liquid generating unit for generating the raw material liquid by merging the raw material with branched water branched from raw water, a membrane-less electrolytic cell for generating a product by electrolyzing the raw material liquid by energization from the DC power supply, and an electrolyzed water generating unit for generating slightly acidic electrolyzed water by merging the product with the main water after the branched water is branched from the raw water, the control unit sets a command current value required to match a chlorine concentration target value within a range of a specified value in the slightly acidic electrolyzed water according to the flow rate, sets a supply amount of the raw material liquid based on the flow rate and the command current value, and adjusts a voltage value of the DC power supply so as to match the chlorine concentration target value based on the flow rate and an actual measured current value. A method for generating electrolytic water, comprising:

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