JP2010207668A - Electrolytic water generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrolytic water generator capable of promptly adjusting the electrolytic current of diluted salt water supplied to an electrolytic cell to a prescribed set current value in a short time without generating an excess electrolytic current inside the electrolytic cell at the start of an electrolytic operation. <P>SOLUTION: The electrolytic water generator is provided with a means S105 for calculating the supply amount of concentrated salt water to be mixed in raw water on the basis of a prescribed voltage value, a set current value, the supply flow rate of the raw water and the concentration of the concentrated salt water at the start of the electrolytic operation, and the electrolytic operation S106 by feedback control is performed with the calculated supply amount of the concentrated salt water as an initial value at the start of the electrolytic operation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrolyzed water generating device, and in particular, by electrolyzing diluted salt water in which concentrated salt water is mixed into raw water supplied to an electrolyzer from a water supply source by applying a predetermined voltage to an electrode in the electrolyzer. The present invention relates to an electrolyzed water generating device that generates electrolyzed water.

  Conventionally, in the following Patent Document 1, an electrolytic current generated in diluted salt water in which concentrated salt water is mixed with raw water supplied from a water supply source by a predetermined voltage applied between electrodes of an electrolytic cell is set to a set current value. An electrolyzed water generating device is disclosed in which the supply amount of concentrated salt water mixed into the raw water is adjusted by feedback control.

  Moreover, in the following patent document 2, the electrolytic current generated in the diluted salt water in which concentrated salt water is mixed into the raw water supplied from the water supply source by a predetermined voltage applied between the electrodes of the electrolytic cell is set to a set current value. The supply amount of concentrated salt water mixed in the raw water is adjusted by feedback control, the adjusted supply amount of concentrated salt water is stored, and the stored supply amount of concentrated salt water is set as the supply amount at the start of the next electrolysis operation. An electrolyzed water generating apparatus is disclosed.

Japanese Patent Application Laid-Open No. 07-232170 JP-A-11-128931

  In the electrolyzed water generating apparatus described in Patent Document 1, since only the raw water is introduced into the electrolytic cell at the start of the electrolysis operation, the supply amount of concentrated salt water gradually increases. It takes a long time to become, and the electrolyzed water produced during that time has the disadvantage that the required characteristics cannot be obtained. On the other hand, in the electrolyzed water generating device described in Patent Document 2, the supply amount of concentrated salt water mixed in raw water at the start of electrolysis operation is adjusted to the supply amount stored during the previous operation. There is an advantage that the current can be adjusted to the set current value in a short time. However, when the salt water tank runs out during the electrolysis operation, the supply amount of concentrated salt water adjusted by feedback control becomes the maximum value, and the operation stops with the supply value of this maximum value being stored. Therefore, when the salt water tank is replenished with salt water in the next electrolysis operation, the supply amount of the concentrated salt water is adjusted to the previously stored maximum value at the start of the electrolysis operation. An electrolysis current is generated, leading to the cause of failure of the components of the electrolyzed water generator and wasteful consumption of salt water.

  The object of the present invention is to solve the above-mentioned problem, so that the electrolytic current of the diluted salt water supplied to the electrolytic cell can be quickly and quickly generated without generating an excessive electrolytic current in the electrolytic cell at the start of the electrolysis operation. The purpose is to adjust to a predetermined set current value.

  In order to achieve the above object, the present invention provides an electrolytic cell in which diluted salt water in which concentrated salt water of a predetermined concentration is mixed into raw water of a predetermined flow rate supplied from a water supply source is introduced as electrolyzed water, and an electrode of the electrolytic cell Current detecting means for detecting an electrolysis current of the diluted salt water generated by a predetermined voltage applied therebetween, so that the electrolysis current of the diluted salt water detected by the current detection means becomes a preset set current value. In the electrolyzed water generating apparatus configured to adjust the supply amount of concentrated salt water mixed into the raw water by feedback control, the predetermined voltage value, the set current value, the supply flow rate of the raw water, and the concentrated water at the start of electrolysis operation. Means for calculating the supply amount of concentrated salt water mixed into the raw water based on the concentration of salt water is provided, and the calculated supply amount of concentrated salt water is used as the initial value at the start of electrolysis operation. Is to provide an electrolytic water generation apparatus, characterized in that control is to be made.

  In order to achieve the above object, the present invention provides a salt water tank for storing concentrated salt water, salt water break detection means for detecting salt water breakage in the salt water tank, and raw water having a predetermined flow rate supplied from a water supply source. Detects the electrolysis current generated by a predetermined voltage applied between an electrolytic cell in which diluted salt water mixed with a predetermined concentration of concentrated salt water supplied from a salt water tank is introduced as electrolyzed water and electrodes of the electrolytic cell Current control means for controlling the supply amount of concentrated salt water mixed into the raw water by feedback control so that the detected electrolysis current of the diluted salt water becomes a predetermined set current value, and by the feedback control. Storage means for storing the adjusted supply amount of the concentrated salt water, and the supply amount of the concentrated salt water mixed into the raw water when the electrolysis operation is started is stored in the storage means. In the electrolyzed water generating apparatus adjusted to the supply amount of salt water, when the electrolysis operation is started immediately after the salt water tank is replenished with the required concentrated salt water by the detection of the salt water outage detecting means, the predetermined voltage is set. Means for calculating the supply amount of concentrated salt water mixed in the raw water based on the value, the set current value, the supply flow rate of the raw water and the concentration of the concentrated salt water, and the calculated supply amount of the concentrated salt water The present invention provides an electrolyzed water generating apparatus characterized in that the feedback control is performed as an initial value at the start of electrolysis operation.

  In any of the electrolyzed water generating devices configured as described above, the feedback control is performed with the supply amount of concentrated salt water calculated by the calculating means at the start of electrolysis operation as an initial value. The electrolytic current of the diluted brine supplied is quickly controlled to a predetermined set current value in a short time, the intended purpose can be achieved, and wasteful consumption of salt water can be eliminated at the start of the electrolysis operation.

In the drawing:
The block diagram which shows schematically 1st Embodiment of the electrolyzed water generating apparatus used as the application object of this invention, 1 is an enlarged view of the control device shown in FIG. The block diagram of the controller of the control apparatus in the electrolyzed water generating apparatus shown in FIG. 4 is a flowchart showing a first embodiment of a control program executed by the controller shown in FIG. A graph showing the relationship between the electrical conductivity of the water to be treated in the electrolytic cell and the electrolysis current value, A flowchart showing a second embodiment of a control program executed by the controller shown in FIG. The figure which shows the means to detect the electrical conductivity of the raw | natural water supplied from a water supply source in the electrolyzed water generating apparatus shown in FIG. The flowchart which shows other embodiment of the control program performed by the controller shown in FIG. It is a flowchart which shows further another embodiment of the control program performed by the controller shown in FIG.

  FIG. 1 shows a first embodiment of an electrolyzed water generating apparatus to which the present invention is applied. The electrolyzed water generating device includes a diaphragm electrolyzer 10, a diluted salt water adjusting mechanism 20, and a control device 30. The electrolytic cell 10 is known per se, and the cell body 11 is partitioned into a pair of electrolytic chambers R1 and R2 by a diaphragm 12, and electrodes 13a and 13b are respectively disposed in these electrolytic chambers. . A branch pipe portion of a diluted salt water conduit 14 for supplying diluted salt water is connected to upstream portions of the electrolytic chambers R1 and R2 of the electrolytic cell 10, and electrolytically generated water is supplied to downstream portions of the electrolytic chambers R1 and R2. The upstream outlet pipes 15a1 and 15b1 are connected to each other. These upstream outlet pipes 15a1 and 15b1 are connected to the downstream outlet pipes 15a2 and 15b2 via the flow path switching valve 16.

  In the electrolysis operation of this electrolyzed water generator, the flow path switching valve 16 is synchronized with the polarity of the electrodes 13a, 13b of the electrolysis chambers R1, R2 periodically reversed under the control of the control device 30. Is switched and the connection of the upstream outlet pipes 15a1 and 15b1 to the downstream outlet pipes 15a2 and 15b2 is switched. By this switching, one downstream outlet pipe 15a2 or 15b2 becomes the electrolytic acid water outlet pipe, and the other downstream outlet pipe 15b2 or 15b2 becomes the electrolytic alkaline water outlet pipe.

  During the electrolysis operation, the dilution supplied into the electrolysis chambers R1 and R2 of the electrolytic cell 10 by the electrolysis current generated by a predetermined voltage applied from the power supply 31 to the electrodes 13a and 13b under the control of the control device 30. Brine is electrolyzed. In this electrolysis operation, when the polarity of the electrode 13a becomes positive and the polarity of the electrode 13b becomes negative, the electrolytic acid water generated in the electrolysis chamber R1 is led out through the upstream outlet pipe 15a1 and the downstream outlet pipe 15a2. Electrolytic alkaline water produced in the electrolysis chamber R2 is led out through the upstream outlet pipe 15b1 and the downstream outlet pipe 15b2. Further, when the polarities of the electrodes 13a and 13b are reversed and the flow path switching valve 16 is switched under the control of the control device 30, the electrolytic alkaline water generated in the electrolysis chamber R1 is connected to the upstream outlet pipe 15a1. The electrolytic acid water led out through the downstream outlet pipe 15b2 and produced in the electrolysis chamber R2 is led out through the upstream outlet pipe 15b1 and the downstream outlet pipe 15a2.

  The value of the electrolysis current generated in the electrolytic cell 10 during the above electrolysis operation is measured by an ammeter 33 connected to a shunt 32 interposed in the middle of the wiring connecting the power source 31 and the electrode 13b. In this case, the electrolysis current value measured by the ammeter 33 is equivalent to the electrical conductivity of the diluted brine supplied into the electrolytic cell 10 and changes according to the electrical conductivity.

  The adjusting mechanism 20 that adjusts the concentration of the diluted brine supplied to the electrolyzer 10 includes a salt water tank 21 that stores high-concentration salt water such as saturated salt water, and a salt water supply conduit 22 that supplies the concentrated salt water in the salt water tank 21. It is comprised by the salt water supply pump 23 of the discharge amount variable type (for example, pulse drive type) interposed, and the salt water supply conduit | pipe 22 is connected to the water supply conduit | pipe 17 connected to the water supply source. The salt water supply pump 23 is driven under the control of the control device 30 to supply the concentrated salt water in the salt water tank 21 to the water supply conduit 17.

  The concentrated salt water supplied to the feed water conduit 17 by the operation of the salt water pump 23 is mixed with the raw water supplied through the feed water conduit 17 and diluted to a predetermined concentration, and then diluted diluted salt water 14 to the electrolysis chamber R1 of the electrolytic cell 10. Supplied to R2. The electric conductivity of diluted salt water electrolyzed in the electrolysis chambers R1 and R2 varies depending on the electric conductivity of raw water described later and the supply amount of concentrated salt water mixed with the raw water.

  The control device 30 is a controller including a microcomputer, and performs a function of applying a predetermined voltage from the power source to the electrodes 13a and 13b in the electrolytic cell 10 and periodically inverting the polarity of the voltage.

  As shown in FIG. 3, a setting switch 30a, a water injection switch 30f, a water amount setting switch 30d, a flow rate sensor 19c, and an ammeter 33 are connected to the input interface 30g of the control device 30. On the other hand, a power supply 31, a salt water supply pump 23, a water valve 19a, and a flow rate adjusting valve 19b are connected to the output interface 30k of the control device 30. The above switches are operated by the user, and as shown in FIGS. 1 and 2, are arranged on an operation panel attached to a proper position of the apparatus main body. The operation panel includes a setting switch 30a and an up / down switch. Extraction of electrolyzed water (alkaline ionic water and acidic ionic water) set by operation of the display unit 30c displaying the voltage value and current value set by the selective operation of 30b1 and 30b2 and the water amount setting switch 30d is extracted. Water amount display lamps 30e1, 30e2, 30e3 for displaying the amount of water are provided.

  The setting switch 30a and the up / down switches 30b1 and 30b2 are switches for changing the setting of the voltage value and the current value. When the setting switch 30a is pressed once, the voltage value currently set on the display unit 30c (for example, 12V ) Is displayed. When the up / down switch 30b1 is pressed in this displayed state, a predetermined voltage value (0.1V) is added to the currently set voltage value, and when the up / down switch 30b2 is pressed, the predetermined voltage value (0.1V) is added. Is subtracted from the currently set voltage value, and the changed voltage value can be set by pressing the setting switch 30a again. The voltage value can be set at an interval of 0.1V between 7.0V and 18.0V.

  When the setting switch 30a is pressed twice, the current value (for example, 10A) currently set is displayed on the display unit 30c. When the up / down switch 30b1 is pressed in the displayed state, a predetermined current value (0.1A) is added to the currently set current value, and when the up / down switch 30b2 is pressed, the predetermined current value (0.1A) is added. Is subtracted from the currently set current value, and the changed current value can be set by pressing the setting switch 30a again. The current value can be set between 5.0A and 18.0A at intervals of 0.1A.

  The water injection switch 30b opens the water supply valve 19a interposed in the water supply conduit 17 by the pressing operation. Thereby, the tap water supplied from the water supply source to the water supply conduit 17 is softened by the water softener 18a interposed in the water supply conduit 17, filtered by the filter 18b, and supplied to the diluted salt water conduit 14 as raw water. be introduced. The water supply conduit 17 is provided with a flow rate adjusting valve 19b provided with a flow rate sensor 19c on the downstream side of the water supply valve 19a. The flow rate adjusting valve 19b adjusts the flow rate of the raw water supplied to the diluted salt water conduit 14 by appropriately setting the opening degree by operating the water amount setting switch 30d. The flow sensor 19c detects the flow of raw water supplied to the diluted salt water conduit 14 when the flow regulating valve 19b is opened.

  The water amount setting switch 30d is a switch for changing the setting of the raw water supply amount. Each time the water amount setting switch 30d is pressed, the lighting position of the water amount display lamps 30e1, 30e2, 30e3 is switched, and the raw water supply amount is large (for example, , Acidic water 3L / min, alkaline water 3L / min total flow rate 6L / min) When the water amount display lamp 30e is turned on and the raw water supply amount is a standard supply amount (for example, acidic water 2L / min, alkaline water 2L) When the water amount display lamp 30e2 is turned on and the raw water supply amount is small (for example, the total flow rate is 3L / min for acidic water 1.5L / min and alkaline water 1.5L / min) The lamp 30e3 is turned on, and the supply amount of raw water is appropriately set by pressing the water amount setting switch 30d.

  The control device 30 controls the voltage values applied between the electrodes 13a and 13b of the electrolytic cell 10, the current value defining the electrolytic current of the diluted salt water in the electrolytic cell 10, and the supply flow rate of the raw water by operating the switches described above. In the state set to the predetermined value, the control program shown by the flowchart of FIG. 4 is executed as follows.

  When the power supply 31 is turned on to start the electrolysis operation and the water injection switch 30f is turned on, the CPU 30h of the control device 30 determines whether the setting switch 30a or the water amount setting switch 30d is turned on in step S101. If it is not ON, since the water supply valve 19a is closed and the flow rate sensor 19c of the flow rate adjustment valve 19b does not detect the inflow of raw water, it is determined NO in step S103 and the program returns to step S101. . Prior to the start of the electrolysis operation, the voltage applied to the electrodes 13a and 13b of the electrolytic cell 10 by a selective operation of the up / down switch 30b1 or 30b2 while the setting switch 30a is pressed is a predetermined voltage value V0 (for example, a factory The set voltage value at the time of shipment is set to 12V), the set current value A0 of the electrolysis current in the electrolytic cell 10 is set (for example, the set voltage value at the time of shipment from the factory is 12V), and the operation of the water amount setting switch 30d is further performed. When the raw water supply flow rate is set to a predetermined flow rate L0 (for example, the set flow rate at the time of factory shipment is 4 L / min for the total flow rate of 2 L / min for acidic water and 2 L / min for alkaline water), The set current value A0 and the set flow rate L0 are stored in the RAM 30j of the control device 30.

  Thus, the CPU 30h of the control device 30 determines YES in step S103, and in the next step S104, the set voltage value V0, the set current value A0, the set flow rate L0, and the set water temperature C for calculation stored in the ROM 30i. The set conductivity value E is obtained based on (for example, 30 ° C.). In this case, the water temperature C is set as a fixed value that is higher than the normal tap water temperature (15 ° C. to 25 ° C.). This is because the higher the water temperature is, the higher the electric conductivity is. Therefore, by setting the water temperature C to a fixed value higher than usual, the supply amount of concentrated salt water is slightly less than the supply amount required from the actual water temperature at the beginning of electrolysis. This is because the supply of excess concentrated salt water can be prevented. Moreover, the means for measuring the water temperature is not required by setting the water temperature C to a fixed value higher than usual. Note that, as shown in FIG. 5, there is a correlation between the current value, the electrical conductivity, and the voltage (11V, 12V, and 13V are shown in the figure) under a certain condition. Therefore, the set conductivity is set in step S104. The value E can be obtained.

Next, when the program proceeds to step S105, the CPU 30h of the control device 30 supplies raw water based on the set conductivity value E obtained in step S104 and the concentrated salt water concentration Q (for example, 25%) stored in the ROM 30i. A supply amount P of concentrated salt water mixed in (for example, a supply amount at which diluted salt water mixed in the raw water becomes 2000 μs / cm ² ) is obtained, and then the program proceeds to step S106. The concentrated salt water concentration Q is set to a fixed value of 25%, which is a saturated concentration. This is because the higher the concentrated salt water concentration is, the higher the electric conductivity is. Therefore, by setting the saturation concentration to a fixed concentration of concentrated salt water Q, an excessive concentration at the initial stage of electrolysis regardless of the actual salt water concentration in the salt water tank 21. This is to prevent the supply of salt water. Moreover, the means for measuring the salt water concentration in the salt water tank 21 by using the saturated salt water concentration Q as a fixed value becomes unnecessary.

  When the program proceeds to step S106, the CPU 30h of the control device 30 applies the predetermined voltage V0 previously set between the electrodes 13a and 13b of the electrolytic cell 10 to start the electrolysis operation. The supply amount of concentrated salt water at the start of electrolysis is the concentrated salt water supply amount P obtained in step S105. Thereafter, a detection signal indicating the electrolytic current value of the diluted salt water detected by the ammeter 33 is input to input the diluted salt water. The operation of the salt water supply pump 23 is controlled so that the electrolysis current of the water reaches the set current value, and feedback control of the supply amount of concentrated salt water mixed with the raw water from the feed water conduit 17 is performed. The electrolysis operation is continued until the disappearance is detected. When there is no more inflow of raw water in step S107, the electrolysis operation is stopped by stopping the application of voltage between the electrodes 13a and 13b of the electrolytic cell 10 in step S108. After the stop, the process returns to step S101, and the processes in steps S101 to S108 are repeated at the next electrolytic operation.

  By the control described above, the electrolysis current can be quickly set to the set current value in a short time from the start of the electrolysis operation.

  In the first embodiment, the setting voltage value V0 and the setting flow rate L0 have been described as being settable. However, the present invention is not limited to this, and the voltage value V and the flow rate L are stored in the ROM 30i as fixed values for calculation. May be used. In the first embodiment, the processing of step S104 and step S105 for obtaining the concentrated salt water supply amount P is performed after step S103. However, the present invention is not limited to this, and the processing of step S104 and step S105 is performed. It may be performed immediately before step S103.

  FIG. 6 is a flowchart of a control program executed by the control device 30 in the second embodiment of the present invention. In steps S201, S202 and S203, step S101 in the program of the first embodiment shown in FIG. The processing similar to the processing in S102 and S103 is executed, and the presence or absence of salt water in the salt water tank is determined based on the flag N recorded in step S211 or S212 described later in step S204. There is a special feature.

  If it is determined in step S204 that the salt water is not exhausted, the electrolysis operation is started from the previously stored concentrated salt water supply amount P in step S207, and the electrolysis current of the diluted salt water detected by the ammeter 33 is increased as described above. Executes processing for adjusting the supply amount P of concentrated salt water mixed in the raw water supplied from the water supply conduit 17 by feedback control so that the set current value AO is set by addition or subtraction by the operation of the down switch 30b1 or 3012. To do.

  On the other hand, if it is determined in step S204 that the salt water has run out, the program proceeds to step S206 and step S207, and the program similar to the process in steps S104 and S105 in the program of the first embodiment is executed. Is returned to step S207 to perform feedback control of the supply amount of concentrated salt water.

  After that, if it is determined in step S208 that no detection signal is given from the flow sensor 19b and there is no inflow of raw water into the diluted salt water conduit 14, the supply amount of concentrated salt water defined by feedback control during the electrolysis operation in step S209. P is stored in the RAM 30j, the program proceeds to step S210, and it is determined whether or not the salt water supply tank 23 is out of salt water. In this case, in the electrolyzed water generating apparatus employing a variable capacity pump (for example, the variable capacity range is 0 to 360 rotations / minute and the normal use range is 60 to 120 rotations / minute) as the salt water supply pump 23, If the supply amount P of concentrated salt water by feedback control is the maximum value (for example, 360 rpm), it is determined that the salt water has run out.

  At this time, if the supply amount P of the concentrated salt water stored in the previous step S209 is the maximum value, it is determined that the salt water has run out in step S210, the program proceeds to step S211 and the flag N indicating the salt water running out is set to “1”. If the supply amount P of the concentrated salt water is not the maximum value, the flag N is set to “0” in step S212, and then the voltage between the electrodes 13a and 13b of the electrolytic cell 10 is set in step S213. The electrolysis operation is stopped by stopping the application.

  Thus, in the second embodiment, when the electrolysis operation is resumed after the above-described electrolysis operation, the processing in steps S201 to S203 is executed, and the determination result is “No” in step S204. For example, the electrolysis operation is started by the supply amount P of the concentrated salt water previously stored in the RAM 30j in step S209, and the electrolysis current of the diluted salt water supplied into the electrolytic cell 10 is controlled to the set current value AO.

If it is determined in step S210 that salt water has run out during the previous electrolysis operation, the flag N is set to “1”, so that “Yes” is determined in step S204 and the RAM 30j is determined in step S205. Based on the stored set voltage value VO, set current value AO and set flow rate LO, in addition to the set water temperature C (for example, 30 ° C.) for calculation, the set conductive value E is obtained, and in the next step S206, the ROM 30i The concentrated salt water supply amount P is calculated in consideration of the concentration Q (for example, 25%) of the concentrated salt water for calculation stored in the storage.
As a result, when the electrolysis operation is started immediately after the salt water tank 21 is replenished with concentrated salt water, the electrolysis current of the diluted salt water supplied into the electrolyzer 10 is quickly controlled to the set current value AO in a short time. Generation | occurrence | production of the excess electrolytic current in a tank can be eliminated.

  In the above control program, when the supply amount P of the concentrated salt water reaches the maximum value in step S210, it is determined that the salt water in the salt water tank 21 has run out. However, a float switch is provided in the salt water tank 21. You may implement so that a salt water break may be detected and a salt water break may be judged by the presence or absence of the detection signal.

In the first embodiment and the second embodiment of the present invention described above, they are stored in the set voltage value V0, the set current value A0, the set flow rate L0, and the ROM 30i in step S104 of FIG. 4 or step S205 of FIG. The set conductivity value E is obtained from the set water temperature C (for example, 30 ° C.) for calculation. If the electrical conductivity EO (for example, 500 μs / cm ² or more) of tap water normally used as raw water is high. As shown in FIG. 5, the electrical conductivity of the diluted salt water electrolyzed in the electrolytic cell 10 becomes excessive, and an excessive electrolysis current is generated at the initial stage of the electrolysis operation, causing troubles in the components of the electrolyzed water generating device. Consumption of concentrated salt water is wasted.

In order to cope with this problem, in another embodiment of the present invention, as shown in FIG. 7, in the electrolyzed water generating device to which the present invention is applied, the water is detected from the water check cock 40 added to the downstream side of the filter 18b. Raw water is taken out into the water container 41 and its electrical conductivity is measured by a conductivity meter 42. In this case, in the electrolyzed water generating device shown in FIG. 1, the voltage value V0 is set when the setting switch 30a of the control device 30 is pressed once, and the current value A0 is set when pressed twice. In the control device 30 in this embodiment, when the setting switch 30a is pressed once, the voltage value V0 is set, when the setting switch 30a is pressed twice, the current value A0 is set, and when the setting switch 30a is pressed three times, the current conductivity value of the raw water ( For example, 200 μs / cm ² ) is displayed on the display unit 30c.

When the up / down switch 30b1 is pressed in such a state of displaying the conductivity value, a predetermined conductivity value (100 μs / cm ² ) is added to the current conductivity value of the raw water, and the up / down switch 30b2 is pressed. And a predetermined conductivity value (100 μs / cm ² ) is subtracted from the currently set conductivity value of the raw water so that the desired conductivity value of the raw water can be set by pressing the setting switch 30a. Incidentally, electric conductivity value of the raw water is desirably to be set at 100 [mu] s / cm ² intervals between 100 [mu] s / cm ² of 1000 .mu.s / cm ^2.

  In the electrolyzed water generator shown in FIG. 7, the conductivity value of raw water taken from the water sampling cock 40 is measured by the conductivity meter 42, but instead of this, it is supplied from the water supply conduit 17. In order to detect the electrical conductivity of the raw water, only the raw water supplied from the water supply pipe 17 is introduced into the electrolytic cell 10 in a state where the salt water supply pump 23 is stopped at the start of the electrolysis operation and the supply of the concentrated salt water is shut off. Then, the electrolysis current of the raw water may be detected by the ammeter 33, and the electrical conductivity of the raw water may be detected based on the current value.

Therefore, in this embodiment, the control program of the first embodiment shown in FIG. 4 is changed as shown in FIG. 8 to cope with the above problem (generation of excessive electrolytic current in the initial stage of electrolysis operation). can do. That is, in the control program shown in FIG. 8, in addition to the set voltage V0, the set current A0, and the set flow rate L0 in step S102A, the conductivity value E0 of the raw water (for example, the raw water conductivity value at the time of factory shipment is 100 μs / cm ² ), and in step S104A added after step S104, the conductivity value E0 set in the previous step S102A is subtracted from the set conductivity value E obtained in step 104 to obtain the initial supply conductivity. The value E1 is obtained. From this initial supply conductivity value E1 and the set salt water concentration Q, a supply amount P of concentrated salt water is obtained in step S105, and using this concentrated salt water supply amount P, an electrolytic operation by feedback control is started in step S106.

  With the above control, the electrolysis current can be set to the set current value in a short time from the start of electrolysis operation, and even if raw water with a high conductivity value is used, concentrated salt water is excessively mixed into the raw water at the start of electrolysis operation. The generation of excessive electrolysis current at the start of the electrolysis operation can be prevented.

  In order to deal with the above problem, the control program according to the second embodiment shown in FIG. 6 may be changed as shown in FIG. 9 to deal with the above problem. In this case, in the control program shown in FIG. 9, in step S202A, in addition to the set voltage V0, set current A0, and set flow rate L0, the conductivity value E0 of raw water is set, and step S205A added next to step S205. The electric conductivity value E0 set in the previous step S202A is subtracted from the set electric conductivity value E obtained in step 205 to obtain an initial supply electric conductivity value E1. Based on this initial supply conductivity value E1 and the set salt water concentration Q, the supply amount P of concentrated salt water is obtained in step S206, and the electrolytic operation by feedback control is started in step S207 using this concentrated salt water supply amount P. .

  Even with such control, the electrolysis current can be set to the set current value in a short time from the start of the electrolysis operation, and even if raw water having a high raw water conductivity value is used, concentrated salt water is converted into the raw water at the start of electrolysis operation. It is possible to prevent excessive electrolysis current from being generated at the start of the electrolysis operation without being excessively mixed.

  In the control program of FIG. 8 and the control program of FIG. 9 described above, the conductivity value measured by the conductivity meter shown in FIG. 7 is read as the electrical conductivity value EO of the raw water. At the start, the salt water supply pump 23 is stopped and the supply of the concentrated salt water is shut off, and only the raw water supplied from the water supply conduit 17 is introduced into the electrolytic cell 10, and the electrolysis current of the raw water is detected by the ammeter 33. Alternatively, the current supply value E1 may be obtained by reading the current value as the electric conductivity value of the raw water at an appropriate step of the control program of FIG. 8 or FIG. In this case, in the control program of FIG. 8, the electrical conductivity value of the raw water is read in the step added after step S103 and the initial supply conductivity value E1 is obtained in step S104A, or the control program of FIG. In step S203, an initial conductivity value E1 may be obtained in step S205A by reading the electric conductivity value of the raw water in a step added after step S203. Alternatively, the initial conductivity value E1 may be obtained in step S205A by reading the electric conductivity value of the raw water in a step added after step S211 in the control program of FIG.

10. Electrolytic cell, 33 ... Current detection means, S102 ... Input of set voltage, set current, set flow rate, S105 ... Means for calculating supply amount of concentrated salt water, S106 ... Electrolysis operation by feedback.

Claims (2)

  The diluted salt water generated by a predetermined voltage applied between an electrolytic cell in which diluted salt water in which concentrated salt water of a predetermined concentration is mixed into raw water of a predetermined flow rate supplied from a water supply source is introduced as the water to be electrolyzed. Current detection means for detecting the electrolysis current of the concentrated salt water mixed in the raw water so that the electrolysis current of the diluted brine detected by the current detection means becomes a preset current value. In the electrolyzed water generating apparatus adjusted by feedback control, the electrolyzed water is mixed into the raw water based on the predetermined voltage value, the set current value, the raw water supply flow rate, and the concentrated salt water concentration at the start of electrolysis operation. Means for calculating a supply amount of concentrated salt water is provided, and the feedback control is performed with the calculated supply amount of concentrated salt water as an initial value at the start of electrolysis operation. Electrolyzed water generating device for.   A salt water tank for storing concentrated salt water, a salt water break detecting means for detecting a salt water break in the salt water tank, and a raw water having a predetermined flow rate supplied from a water supply source mixed with concentrated salt water having a predetermined concentration supplied from the salt water tank. An electrolytic cell in which diluted salt water is introduced as electrolyzed water, current detection means for detecting an electrolytic current of the diluted salt water generated by a predetermined voltage applied between electrodes of the electrolytic cell, and electrolysis of the detected diluted salt water Control means for adjusting the supply amount of concentrated salt water mixed in the raw water by feedback control so that the current becomes a predetermined set current value, and storage means for storing the supply amount of the concentrated salt water adjusted by the feedback control The amount of concentrated salt water mixed in the raw water when the electrolysis operation is started is adjusted to the amount of concentrated salt water stored in the storage means. In the apparatus, when the electrolysis operation is started immediately after the salt water tank is replenished with the required salt water tank by the detection of the salt water outage detection means, the predetermined voltage value, the set current value, the supply flow rate of the raw water, and Means for calculating the supply amount of concentrated salt water mixed in the raw water based on the concentration of the concentrated salt water is provided, and the feedback control is performed with the calculated supply amount of concentrated salt water as an initial value at the start of electrolysis operation. An electrolyzed water generating device characterized in that the electrolyzed water generating device is provided.

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