JP2011255348A - Electrolytic water generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electrolytic water generator in which a reverse osmosis membrane can be more easily cleaned.SOLUTION: The electrolytic water generator 1 has a filter 41 having the reverse osmosis membrane 41a at the least, at least a pair of electrodes 54, 55, and a cleaning means for cleaning the filter 41. The cleaning means has: an introduction line P13 for introducing the electrolytic water generated in an electrolysis part 5 into the raw water side of the reverse osmosis membrane 41a; and drain lines P5, P7, P8 for discharging the electrolytic water introduced into the raw water side of the reverse osmosis membrane 41a.

Description

  The present invention relates to an electrolyzed water generating apparatus that generates alkali ion water by electrolysis.

  Conventionally, by adding a biodegradable scale inhibitor to the water to be treated and adding alkali to adjust the pH to be 9.5 or higher, the RO membrane separation device is passed through the RO membrane. There is known an apparatus that performs the cleaning of (see, for example, Patent Document 1).

JP 2007-253073 A

  However, in the conventional technique, in order to clean the RO membrane (reverse osmosis membrane), a chemical must be prepared and the amount of the chemical added must be managed, and the cleaning operation is complicated.

  Then, an object of this invention is to obtain the electrolyzed water generating apparatus which can wash | clean a reverse osmosis membrane more easily.

  In the present invention, there is provided an electrolyzed water generating apparatus comprising: a filter having at least a reverse osmosis membrane; and an electrolysis unit having at least a pair of electrodes and electrolyzing water to generate electrolyzed water, The electrolyzed water generating device includes a cleaning unit that cleans the filter, and the cleaning unit introduces the electrolyzed water generated in the electrolysis unit to the raw water side of the reverse osmosis membrane, and the reverse And a drainage channel for discharging the electrolyzed water introduced to the raw water side of the osmosis membrane.

  According to this invention, it has the introduction path which introduces the electrolyzed water produced | generated in the electrolysis part into the raw | natural water side of a reverse osmosis membrane, and the drainage channel which discharges | emits the electrolyzed water introduced into the raw | natural water side of a reverse osmosis membrane. Cleaning means are provided. Therefore, the electrolyzed water produced | generated in an electrolysis part can be utilized as a washing | cleaning liquid of a filter. As a result, an electrolyzed water generating apparatus that can more easily clean the reverse osmosis membrane can be obtained.

FIG. 1 is an overall configuration diagram schematically showing an electrolyzed water generating device according to a first embodiment of the present invention. FIG. 2 is an overall configuration diagram schematically showing an electrolyzed water generating device according to a second embodiment of the present invention. FIG. 3 is an overall configuration diagram schematically showing an electrolyzed water generating device according to a third embodiment of the present invention. FIG. 4 is an overall configuration diagram schematically showing an electrolyzed water generating device according to a fourth embodiment of the present invention. FIG. 5 is an overall configuration diagram schematically showing an electrolyzed water generating device according to a fifth embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the side opposite to the side where the permeated water of the reverse osmosis membrane is generated (the side where water that does not pass through the reverse osmosis membrane of the nanofilter exists) is defined as the raw water side of the reverse osmosis membrane. Moreover, the following several embodiment and its modification include the same component. Therefore, in the following, common reference numerals are given to those similar components, and redundant description is omitted.

(First embodiment)
As shown in FIG. 1, the electrolyzed water generating apparatus 1 according to the present embodiment includes a housing 2 and a water discharger 3 attached to the housing 2. Moreover, the electrolyzed water generating apparatus 1 includes a nanofilter (a filter having at least a reverse osmosis membrane) 41 having an NF membrane (reverse osmosis membrane) 41a, a water purification unit 4 disposed in the housing 2, an anode plate 54 and a cathode plate 55 (at least a pair of electrodes), and an electrolyzer (electrolyzer) 5 for electrolyzing water (treated water).

  The electrolyzed water generating device 1 generates alkaline ionized water or acidic water from raw water, and generates electrolyzed water by being attached to a faucet (not shown) provided on a sink such as a kitchen or kitchen. Alkaline ion water or acidic water (electrolyzed water) generated by the apparatus 1 can be discharged from the water discharge section 3. In addition, this electrolyzed water production | generation apparatus 1 may be installed on a sink, and is good also as what is called a built-in type installed in the inside of a sink.

  The water purification unit 4 is connected to the tap water channel P0 via the branch portion D1, and has a main water channel P1 into which tap water as raw water is introduced, and the nanofilter 41 is arranged in the main water channel P1. Yes. Furthermore, in this embodiment, the pre-processing part 40 is arrange | positioned in the upstream of the nano filter 41, and the water pre-processed in the said pre-processing part 40 is introduced into the nano filter 41.

  Specifically, in the present embodiment, the first prefilter 42, the supply pump 43, the second prefilter 44, the third prefilter 45, and the nanofilter 41 are sequentially arranged from the upstream side to the downstream side of the main water passage P1. Is arranged. Moreover, in this embodiment, the pressure sensor 6 which detects the water pressure of the tap water supplied in the water purification part 4 is provided in the upstream of the 1st pre filter 42 of the main channel P1. Between the filter 42 and the supply pump 43, an on-off valve 7 for controlling the start and stop of introduction of tap water into the electrolyzed water generating device 1 is provided.

  The first pre-filter 42 is composed of, for example, a nonwoven fabric filter having a pore diameter of 5 μm, and captures and removes relatively large foreign matters such as large particles and dust mixed in tap water introduced into the main water passage P1. To do. The pre-filter 42 is provided to prevent the pumping capacity from being lowered due to the mixing of fine particles into the supply pump 43 and to prevent the opening / closing operation of the on-off valve 7 from being hindered. It does not have to be provided. However, in that case, for example, it is preferable to dispose a strainer capable of capturing fine particles upstream of the supply pump 43 and the on-off valve 7.

  The water that has passed through the first pre-filter 42 and the on-off valve 7 and reached the supply pump 43 is pressurized (for example, 0.4 MPa) by the supply pump 43 and is pumped downstream. The supply pump 43 generates reverse osmosis pressure of the nanofilter 41 by increasing the pressure of water from which dust or the like has been removed and pumping the water downstream. The arrangement positions of the supply pump 43 and the on-off valve 7 are not limited to those shown in FIG. 1 and can be arranged at other places. For example, it is possible to arrange on the downstream side of the third pre-filter 45 or on the upstream side of the first pre-filter 42 with the strainer arranged on the upstream side.

  Then, the water pressurized by the supply pump 43 and pumped downstream is introduced into the second pre-filter 44 and the third pre-filter 45 to remove free residual chlorine and the like.

  The second pre-filter 44 contains an activated carbon filter (not shown), and removes components dissolved in water, particularly off-flavors and odors, or halogenated carbon such as trihalomethane.

  In addition, a heavy metal removing agent for removing heavy metals may be mixed in the activated carbon filter so that harmful heavy metals such as lead can be adsorbed and removed by the heavy metal removing agent. Further, by decomposing and removing residual chlorine in water with an activated carbon filter, bacteria can easily propagate on the downstream side. In order to prevent this, the second prefilter 44 contains an antibacterial metal such as silver. An antibacterial agent may be mixed.

  Further, the third prefilter 45 is constituted by, for example, a nonwoven fabric filter having a pore diameter of 1 μm, and captures and removes finer suspended substances that are not captured by the first prefilter 42.

  As described above, in the present embodiment, the water pretreated by the first prefilter 42, the supply pump 43, the second prefilter 44, and the third prefilter 45 is introduced into the nanofilter 41. It has become. That is, in the present embodiment, the first prefilter 42, the supply pump 43, the second prefilter 44, and the third prefilter 45 form the preprocessing unit 40.

  Note that the configuration of the pretreatment unit is not limited to this configuration. For example, a block activated carbon filter or a fibrous activated carbon filter is used, and the pore diameter of the filter is used to combine the function of the nonwoven fabric filter. Good.

  And the water pre-processed in the pre-processing part 40 is introduce | transduced into the nano filter 41, and concentrated water and treated water are produced | generated. In the present embodiment, the two nanofilters 41 and 41 are arranged in parallel, and water is introduced through the water passages P2 and P3, respectively.

  A flow rate sensor 8 that detects the amount of inflow into the nanofilter 41 is provided on the upstream side of the nanofilter 41.

  The nanofilter 41 is made of an organic substance (for example, trihalomethane, musty odor and agricultural chemical), heavy metal ions (for example, lead, chromium, cadmium, mercury, arsenic, etc.), and low molecular weight ions such as sodium and calcium by the NF film 41a. It removes components and the like. And the water which permeate | transmitted the NF film | membrane 41a is supplied to the electrolyzer (electrolysis part) 5 through the process water channels P4 and P6, respectively, and the combined water channels P9 and P10 as processed water from which these substances were removed. . Further, the water that does not pass through the NF membrane 41a passes through the concentrated water passages P5 and P7 as concentrated water containing the above-described substances, and is discharged to the outside from the merging drainage channel P8 provided with the drainage adjusting valve 9.

  Note that the NF membrane 41a has larger permeation holes than the RO membrane. Therefore, the nanofilter 41 using the NF film 41a can remove particles, organic substances, and heavy metals at a high removal rate of 90% or more, but low molecular weight ionic components remain in the permeated water by about 10 to 30%. It has the characteristic of In this case, for example, when water having a conductivity of 300 μS / cm is permeated, treated water having a conductivity of about 60 μS / cm is obtained as the treated water in which the low molecular ions remain. By using such a nanofilter 41, it is possible to leave low molecular weight ionic components in the purified water introduced into the electrolytic cell 5, so that the purified water is electrolyzed without adding an electrolysis auxiliary agent to generate alkaline ions. Water can be generated. However, the membrane used as the reverse osmosis membrane is not limited to this NF membrane, and a reverse osmosis membrane such as an RO membrane can also be used.

  In this embodiment, two NF films 41a of the nanofilter 41 are arranged in parallel. However, the number of the NF films 41a is not limited to this configuration, and the number can be increased or decreased as necessary. is there.

  Then, the treated water that has passed through the NF film 41 a of the nanofilter 41 is supplied to the electrolytic cell (electrode unit) 5.

  The electrolytic cell 5 is provided with an anode chamber 52 and a cathode chamber 53 partitioned by an electrolytic diaphragm 51. The anode chamber 52 is provided with an anode plate (anode) 54, and the cathode chamber 53 has a cathode plate. A (cathode) 55 is provided. The anode plate 54 and the cathode plate 55 are disposed at positions facing each other with the electrolytic diaphragm 51 interposed therebetween.

  Further, the water flow path P <b> 10 on the downstream side of the nanofilter 41 (specifically, on the downstream side of a branch part D <b> 4 described later) is connected to the first branch path P <b> 12 connected to the anode chamber 52 and the second branch connected to the cathode chamber 53. The treated water branched to the path P11 and passed through the water purification unit 4 is introduced into the anode chamber 52 through the first branch path P12 and is introduced into the cathode chamber 53 through the second branch path P11. At this time, the amount of treated water introduced into the anode chamber 52 and the cathode chamber 53 is distributed at a predetermined rate, and in this embodiment, the amount introduced into the anode chamber 52 and the amount introduced into the cathode chamber 53. The ratio is 1: 4. In addition, the flow rate sensor 10 which detects the flow volume of treated water is provided in the water flow path P10.

  The treated water introduced into the anode chamber 52 and the cathode chamber 53 is electrolyzed by applying a voltage to the anode plate 54 and the cathode plate 55, and the treated water introduced into the anode chamber 52 becomes acidic water. Then, the treated water introduced into the cathode chamber 53 is supplied as alkaline ionized water from the acidic water passage 56 to the second discharged water currant 39 from the alkaline water passage 58. Thus, the acidic water generated in the electrolytic cell (electrode unit) 5 can be taken out from the first water discharge currant 37, and the alkaline ionized water generated in the electrolytic cell (electrode unit) 5 is second Can be taken out from the water discharge currant 39.

  In addition, although acid water and alkali ion water are produced | generated by electrolyzing in this way in the electrolytic cell 5, it is alkali ion water used exclusively for drinking, and acid water is used for another special use. Anything other than is discarded.

  In the present embodiment, the pressure sensor 6, the supply pump 43, the on-off valve 7, the flow sensor 8, the drainage adjustment valve 9, the flow sensor 10, the anode plate 54, the cathode plate 55, and the water discharge unit 3 of the electrolytic cell 5 are provided. The not-shown operation / notification unit is connected to the control device 11 via the wirings H1, H2, H3, H4, H8, H9, H10, and H11, and is controlled by the control device 11.

  Here, in this embodiment, the electrolyzed water generating apparatus 1 is provided with a cleaning means for cleaning the nanofilter 41.

  Specifically, the cleaning means includes an introduction path P13 for introducing acidic water (electrolyzed water) generated in the electrolytic cell (electrolyzer) to the raw water side of the NF membrane (reverse osmosis membrane) 41a, and an NF membrane (reverse). Drainage channels P5, P7 and P8 for discharging acidic water (electrolyzed water) introduced on the raw water side of the osmotic membrane 41a. As described above, in the present embodiment, during normal operation (alkaline ion water generation mode), the concentrated water passages P5 and P7 that drain the concentrated water generated by the nanofilter 41 and the combined drainage channel P8 are drained during cleaning. It also serves as the paths P5, P7 and P8.

  Furthermore, in this embodiment, the detour water channel P14 which prevents the water that has passed through the pretreatment unit 40 from being directly introduced into the nanofilter 41 is provided.

  One end of the introduction path P13 is connected to the alkaline water passage 58 via the branch portion D2, and the other end is connected to the upstream side of the nanofilter 41 of the main water passage P1 via the branch portion D3. An opening / closing valve 12 is provided in the introduction path P13.

  On the other hand, the detour channel P14 has one end connected to the boundary portion between the merged water channel P9 and the merged water channel P10 via the branch part D4, and the other end from the flow sensor 8 of the main water channel P1 via the branch part D5. Is also connected downstream and upstream of the branching portion D3. An opening / closing valve 13 is also provided in this bypass water channel P14. Furthermore, in this embodiment, the on-off valve 14 is provided also in the main water flow path P1 between the branch part D3 and the branch part D5.

  In the present embodiment, the on-off valve 14, the on-off valve 13, and the on-off valve 12 are connected to the control device 11 via the wires H5, H6, and H7, respectively, and are controlled by the control device 11.

  The electrolyzed water generating apparatus 1 having such a configuration operates as follows.

  First, when an operation unit (not shown) provided in the water discharge unit 3 is operated to select the alkaline ionized water generation mode, the control device 11 opens the on-off valve 7 of the main water passage P1. At this time, the on-off valve 14 is opened by the control device 11, and the on-off valve 12 and the on-off valve 13 are closed by the control device 11. Then, the tap water is introduced from the tap water channel P0 into the main water channel P1 through the branch portion D1, and the pretreatment unit 40 in the main water channel P1, that is, the first to third pre-filters 42, 44, 45 is connected. While being purified, the water is purified and the pressure is increased by the supply pump 43. Then, the water purified by the pretreatment unit 40 is introduced into the nanofilter 41 through the on-off valve 14. Then, the treated water introduced into the nanofilter 41 and permeated through the NF film 41a and from which organic substances and ions dissolved in the water are removed by the NF film 41a passes through the treated water channels P4 and P6 and passes through the combined water channels P9 and P10. To the electrolytic cell (electrolysis unit) 5. At this time, when a predetermined flow rate is detected by the flow sensor 10 provided in the merging water channel P <b> 10, the control device 11 applies a DC voltage between the anode plate 54 and the cathode plate 55 of the electrolytic cell (electrolysis unit) 5. Then, electrolysis of the treated water is started inside the electrolytic cell (electrolysis unit) 5. At this time, the acidic water generated in the anode chamber 52 is supplied from the acidic water passage 56 to the first water discharge currant 37 and discharged to the outside. The alkaline ionized water generated in the cathode chamber 53 is supplied from the alkaline water passage 58 to the second water discharge currant 39 and discharged outside.

  Then, the water that is introduced into the nanofilter 41 but does not permeate the NF membrane 41a passes through the concentrated water passages P5 and P7 and the combined drainage channel P8 as concentrated water and is discharged to the outside. At this time, the ratio of the treated water and the concentrated water can be changed by appropriately setting the supply pressure of the supply pump 43, the opening degree of the on-off valve 9 provided in the merging drainage channel P8, and the like.

  When the operation unit (not shown) provided in the water discharge unit 3 is operated to stop the flow of alkaline ionized water, the control device 11 reverses the polarities of the anode plate 54 and the cathode plate 55 for a predetermined time. Let At this time, alkaline ion water is generated in the anode chamber 52, and acidic water is generated in the cathode chamber 53. Further, the control device 11 closes the on-off valve 14 and opens the on-off valve 12 and the on-off valve 13. Furthermore, the opening degree of the on-off valve 9 is expanded by the control device 11 so that the amount of drainage from the merge drainage channel P8 increases.

  Thereby, the water purified by the pre-processing part 40 passes the detour water channel P14 from the branch part D5, and is introduce | transduced into the merge water channel P10 from the branch part D4.

  The water introduced into the merged water channel P10 is introduced into the anode chamber 52 through the first branch channel P12 and is introduced into the cathode chamber 53 through the second branch channel P11. At this time, since the polarities of the anode plate 54 and the cathode plate 55 remain reversed, the water introduced into the anode chamber 52 is supplied as alkaline ionized water from the acidic water passage 56 to the first water discharge currant 37 to be externally supplied. Discharged. A part of the acidic water generated in the cathode chamber 53 is supplied from the alkaline water passage 58 to the second water discharge currant 39 and discharged to the outside, and the rest is supplied as cleaning water via the branch portion D2 to the introduction path P13. To be introduced. Then, the acidic water introduced into the introduction passage P13 is introduced into the main water passage P1 through the branch portion D2, and is introduced into the nanofilter 41 from the main water passage P1.

  The acidic water introduced into the nanofilter 41 contains a low concentration of hypochlorous acid, and microorganisms attached to the raw water side surface of the NF membrane 41a of the nanofilter 41 are sterilized by the hypochlorous acid. . In addition, inorganic salts such as calcium carbonate (substances that are acidic and easily dissolved) adhering to the raw water side surface of the NF membrane 41a are dissolved by the acidic water introduced into the nanofilter 41 while being drained along with the drainage channels P5 and P7. And drained to the outside through P8.

  By the way, a predetermined voltage is applied between the anode plate 54 and the cathode plate 55 of the electrolytic cell 5, and at this time, the generated acidic water (electrolyzed water as cleaning water) is generated by the current value flowing between the two electrodes. PH and concentration of hypochlorous acid are defined. For this reason, in the present embodiment, a predetermined voltage is applied between the anode plate 54 and the cathode plate 55 by the control device 11, and at this time, the current value flowing between the two electrodes is detected. Based on the cleaning time for each current value stored in advance, the cleaning time corresponding to the detected current value is selected, and the NF film 41a of the selected cleaning time nanofilter 41 is cleaned. .

  As described above, in the present embodiment, the electrolyzed water generating apparatus 1 includes a water quality detecting unit that detects the quality of acidic water (electrolyzed water) as cleaning water, and a cleaning that measures the time for cleaning the nanofilter 41 by the cleaning unit. Time detection means.

  Moreover, since the opening degree of the on-off valve 9 is enlarged at the time of washing | cleaning, there is almost no water which permeate | transmits the NF film | membrane 41a, and the water quantity (water quantity which exists in the raw | natural water side of the NF film | membrane 41a) inside the nano filter 41 increases. . Therefore, the linear velocity of acidic water on the raw water side surface of the NF film 41a increases, and physical peeling of the deposits is promoted.

  Then, after the predetermined time has elapsed, the control device 11 closes the on-off valve 7 and stops driving the supply pump 43 and electrolysis in the electrolytic cell (electrolysis unit) 5. Further, the control device 11 closes the on-off valve 12 and the on-off valve 13 and closes the on-off valve 9.

  At this time, a time difference is provided between the control for closing the on-off valve 7 and stopping the driving of the supply pump 43 and the electrolysis in the electrolytic cell (electrolysis unit) 5 and the control for closing the on-off valve 12, the on-off valve 13, and the on-off valve 7. Is preferable. In this way, water leakage from the second water discharge currant 39 can be suppressed, and water in the electrolyzed water generating device 1 can be discharged from the drainage channels P5, P7, and P8. The cleaning water introduction path may be provided separately from the water path used in the normal operation mode. Similarly, a drainage channel that drains after washing the NF membrane 41a may be provided separately from the channel used in the normal operation mode.

  Some types of substances adhering to the reverse osmosis membrane, such as organic substances and silica, are easily dissolved in alkaline water. Therefore, in order to remove such a substance, it is possible to use alkaline ionized water (electrolyzed water) generated in the electrolytic cell (electrolyzing unit) 5 as cleaning water.

  As described above, according to the present embodiment, the acid water (electrolyzed water) generated in the electrolyzer (electrolyzer) 5 is supplied to the electrolyzed water generator 1 by the raw water side of the NF membrane (reverse osmosis membrane) 41a. There is provided a cleaning means having an introduction path P13 to be introduced into the water and drainage paths P5, P7 and P8 for discharging acidic water (electrolyzed water) introduced to the raw water side of the NF membrane (reverse osmosis membrane) 41a. Therefore, acidic water (electrolyzed water) generated in the electrolytic cell (electrolyzing unit) 5 can be used as a cleaning liquid for the nanofilter (filter) 41. Therefore, the NF membrane (reverse osmosis membrane) 41a can be cleaned without using any special chemicals for cleaning the NF membrane (reverse osmosis membrane) 41a.

  That is, according to this embodiment, the electrolyzed water generating apparatus 1 that can more easily clean the NF membrane (reverse osmosis membrane) 41a can be obtained.

  Moreover, by using the acidic water (electrolyzed water) produced | generated in the electrolytic cell (electrolytic part) 5 as a washing | cleaning liquid of the nano filter (filter) 41, by hypochlorous acid contained in acidic water (electrolyzed water), Microorganisms adhering to the raw water side surface of the NF membrane 41a of the nanofilter 41 can be sterilized. Furthermore, by using acidic water (electrolyzed water), inorganic salts such as calcium carbonate (substances that are easily dissolved by acid) adhering to the raw water side surface of the NF membrane 41a can be discharged while being dissolved.

  In addition, according to the present embodiment, the NF membrane (reverse osmosis membrane) 41a is washed after the alkaline ionized water is generated (after use) by the electrolyzed water generator 1, and therefore the NF membrane (reverse osmosis membrane). The life of 41a can be extended.

  Moreover, in this embodiment, the electrolyzed water production | generation apparatus 1 is a washing | cleaning time detection which measures the time which wash | cleans the nano filter 41 by the water quality detection means which detects the quality of the acidic water (electrolyzed water) as washing water, and a washing means. Means.

  Therefore, the cleaning time of the NF film 41a can be set according to the concentration of hypochlorous acid contained in the cleaning water, and the NF film 41a is cleaned while suppressing damage to the NF film 41a due to hypochlorous acid. can do.

(Second Embodiment)
The electrolyzed water generating apparatus 1A according to the present embodiment has basically the same configuration as that of the first embodiment. That is, the electrolyzed water generating apparatus 1 </ b> A includes a housing 2 and a water discharge unit 3 attached to the housing 2. Moreover, the electrolyzed water generating apparatus 1A includes a nanofilter (a filter having at least a reverse osmosis membrane) 41 having an NF membrane (reverse osmosis membrane) 41a, and a water purification unit 4 disposed in the housing 2, an anode plate 54 and a cathode plate 55 (at least a pair of electrodes), and an electrolyzer (electrolyzer) 5 for electrolyzing water (treated water).

  Here, the electrolyzed water generating apparatus 1A according to the present embodiment is mainly different from the first embodiment in that cleaning water is introduced into the nanofilter 41 from the concentrated water passages P5 and P7. is there.

  Specifically, as shown in FIG. 2, the other end of the introduction path P13 that introduces acidic water (electrolyzed water) generated in the electrolytic cell (electrolyzing unit) to the raw water side of the NF membrane (reverse osmosis membrane) 41a. Is connected to the concentrated water passage P7 via the branch portion D6, and the washing water is also introduced into the concentrated water passage P5 from the introduction passage P13. In addition, the opening / closing valve 12 is provided in the introduction path P13 similarly to the said 1st Embodiment. And the detour water channel P14 which prevents the water which passed the pre-processing part 40 from being directly introduce | transduced into the nano filter 41 is provided.

  Further, in the present embodiment, one end is connected to the downstream side of the on-off valve 14 of the main water passage P0 and the upstream side of the nanofilter 41 via the branch portion D3, and the other end is joined to the combined drainage via the branch portion D7. A drainage channel P15 connected to the downstream side of the on-off valve 9 of the channel P8 is provided.

  An open / close valve 15 is provided in the drainage channel P15.

  And in this embodiment, the drainage channel which drains wash water is comprised by the drainage channel P15 and the confluence | merging drainage channel P8.

  In the electrolyzed water generating apparatus 1A having such a configuration, the on-off valve 12, the on-off valve 13, and the on-off valve 15 are closed by the control means 11, and the on-off valve 7, the on-off valve 9, and the on-off valve 14 are opened by the control means 11. The alkaline ionized water generated in the electrolytic cell (electrode part) 5 can be taken out from the second water discharge currant 39 by passing water through the electrolytic water generator 1A.

  When the flow of alkaline ionized water is stopped, the on-off valve 12, on-off valve 13, and on-off valve 15 are opened by the control means 11, and the on-off valve 9 and on-off valve 14 are closed by the control means 11, so that the anode plate 54 and the cathode plate In a state where the polarity of 55 is reversed for a predetermined time, water is passed through the electrolyzed water generating apparatus 1A. Thus, of the acidic water generated in the cathode chamber 53, the acidic water introduced into the introduction path P13 is used as washing water, and the acidic water passes through the concentrated water passages P5 and P7 and is an NF membrane (reverse osmosis membrane). It is introduced into the raw water side of 41a. And the waste_water | drain which wash | cleaned NF membrane (reverse osmosis membrane) 41a is drained outside through the drainage channel P15 and the confluence | merging drainage channel P8.

  Thus, the electrolyzed water generating apparatus 1A is provided with a cleaning means for cleaning the nanofilter 41. Furthermore, in the electrolyzed water generating apparatus 1A, as in the first embodiment, water quality detecting means for detecting the quality of acidic water (electrolyzed water) as cleaning water, and time for cleaning the nanofilter 41 by the cleaning means are provided. Cleaning time detection means for measuring is provided.

  Also according to this embodiment described above, the same operations and effects as those of the first embodiment can be achieved.

(Third embodiment)
The electrolyzed water generating apparatus 1B according to the present embodiment has basically the same configuration as that of the second embodiment. That is, the electrolyzed water generating apparatus 1 </ b> B includes a housing 2 and a water discharge unit 3 attached to the housing 2. The electrolyzed water generating apparatus 1B includes a nanofilter (a filter having at least a reverse osmosis membrane) 41 having an NF membrane (reverse osmosis membrane) 41a, a water purification unit 4 disposed in the housing 2, and an anode plate 54 and a cathode plate 55 (at least a pair of electrodes), and an electrolyzer (electrolyzer) 5 for electrolyzing water (treated water).

  Further, in the present embodiment, as in the second embodiment, the wash water is introduced from the concentrated water passages P5 and P7 into the nanofilter 41 and drained from the drainage channel P15 and the merged drainage channel P8. Yes.

  Moreover, the electrolyzed water generating apparatus 1B is also provided with a cleaning means for cleaning the nanofilter 41, as in the second embodiment.

  Here, the electrolyzed water generating apparatus 1B according to the present embodiment is mainly different from the second embodiment in that a water quality sensor (water quality) that detects the quality of acid water (electrolyzed water) discharged to the drainage channel P15. (Detection means) 16 is provided.

  In the electrolyzed water generating apparatus 1B having such a configuration, the on-off valve 12, the on-off valve 13, and the on-off valve 15 are closed by the control means 11, and the on-off valve 7, the on-off valve 9, and the on-off valve 14 are opened by the control means 11. The alkaline ionized water generated in the electrolytic cell (electrode part) 5 can be taken out from the second water discharge currant 39 by passing the water through the electrolyzed water generating device 1B.

  When the flow of alkaline ionized water is stopped, the on-off valve 12, on-off valve 13, and on-off valve 15 are opened by the control means 11, and the on-off valve 9 and on-off valve 14 are closed by the control means 11, so that the anode plate 54 and the cathode plate Water is passed through the electrolyzed water generating device 1B with the polarity of 55 reversed for a predetermined time. Thus, of the acidic water generated in the cathode chamber 53, the acidic water introduced into the introduction path P13 is used as washing water, and the acidic water passes through the concentrated water passages P5 and P7 and is an NF membrane (reverse osmosis membrane). It is introduced into the raw water side of 41a. And the waste_water | drain which wash | cleaned NF membrane (reverse osmosis membrane) 41a is drained outside through the drainage channel P15 and the confluence | merging drainage channel P8.

  At this time, the water quality (pH or conductivity) of the waste water from which the NF membrane (reverse osmosis membrane) 41 a is washed is detected by the water quality sensor (water quality detection means) 16.

  By the way, at the initial stage of washing, since the amount of inorganic salts such as calcium carbonate dissolved in the waste water is large, the pH and conductivity of the waste water are increased. When the washing is continued, the amount of inorganic salts such as calcium carbonate gradually dissolved in the waste water is reduced, and accordingly, the pH and conductivity of the waste water are gradually lowered, and the pH of the acidic water generated in the cathode chamber 53 is decreased. And approaching conductivity.

  Therefore, in this embodiment, the water quality sensor (water quality detection means) 16 detects that the water quality (pH or conductivity) of the waste water from which the NF membrane (reverse osmosis membrane) 41a has been washed is below a predetermined value. Or the amount of change in pH or conductivity per unit time is calculated by the control device 11, and the preset pH or conductivity or the amount of change in pH or conductivity per unit time is below a predetermined value. In this case, the cleaning is terminated.

  Also according to this embodiment described above, the same operations and effects as those of the second embodiment can be achieved.

  Moreover, according to this embodiment, since the water quality sensor (water quality detection means) 16 which detects the quality of the discharged acidic water (electrolyzed water) is provided in the drainage channel P15, the NF membrane (reverse osmosis membrane) 41a. When the removal of inorganic salts such as calcium carbonate adhering to is completed, the cleaning can be terminated. Therefore, it is possible to suppress an excess or deficiency in the cleaning time (cleaning wastefully or insufficiently cleaning).

(Fourth embodiment)
The electrolyzed water generating apparatus 1C according to the present embodiment has basically the same configuration as that of the second embodiment. That is, the electrolyzed water generating apparatus 1 </ b> C includes a housing 2 and a water discharge unit 3 attached to the housing 2. The electrolyzed water generating apparatus 1C includes a nanofilter (a filter having at least a reverse osmosis membrane) 41 having an NF membrane (reverse osmosis membrane) 41a, a water purification unit 4 disposed in the housing 2, an anode plate 54 and a cathode plate 55 (at least a pair of electrodes), and an electrolyzer (electrolyzer) 5 for electrolyzing water (treated water).

  Further, in the present embodiment, as in the second embodiment, the wash water is introduced from the concentrated water passages P5 and P7 into the nanofilter 41 and drained from the drainage channel P15 and the merged drainage channel P8. Yes.

  Further, similarly to the second embodiment, the electrolyzed water generating apparatus 1C also includes a cleaning unit that cleans the nanofilter 41, a water quality detection unit that detects the quality of acidic water (electrolyzed water) as cleaning water, and a cleaning unit. And a cleaning time detecting means for measuring the time for cleaning the nanofilter 41 by the means.

  Here, the electrolyzed water generating apparatus 1C according to the present embodiment is mainly different from the second embodiment in that the cleaning means is the acidic water (electrolyzed water) generated in the electrolyzer (electrolyzer) 5. In the point which has the storage part 17 which stores at least one part, and the introduction path P13 as a supply means which introduces the acidic water (electrolyzed water) in the said storage part 17 into the raw | natural water side of NF membrane (reverse osmosis membrane) 41a is there.

  Specifically, one end of the introduction path P13 through which the acidic water (electrolyzed water) generated in the electrolytic cell (electrolytic part) is introduced to the raw water side of the NF membrane (reverse osmosis membrane) 41a is connected via the branch part D8. The other end is connected to the acidic water passage 56, the other end is connected to the concentrated water passage P7 via the branch portion D6, and the washing water is introduced into the concentrated water passage P5 from the introduction passage P13. An opening / closing valve 12 is provided in the introduction path P13, and a storage portion 17 is provided on the upstream side of the opening / closing valve 12 (one end side of the introduction path P13). The storage unit 17 is provided above the nanofilter 41 in the housing 2 of the electrolyzed water generating device 1C. In this manner, by providing the storage unit 17 above the nanofilter 41, the acidic water can be introduced into the nanofilter 41 by utilizing the weight of the acidic water.

  In the electrolyzed water generating apparatus 1C having such a configuration, the on-off valve 12, the on-off valve 13, and the on-off valve 15 are closed by the control means 11, and the on-off valve 7, the on-off valve 9, and the on-off valve 14 are opened by the control means 11. The alkaline ionized water generated in the electrolytic cell (electrode part) 5 can be taken out from the second water discharge currant 39 by passing water through the electrolyzed water generating device 1C. A part of the acidic water generated in the electrolytic cell (electrode part) 5 is discharged to the outside from the first water discharge currant 37, and the rest is introduced into the storage part 17 from the introduction path P13. Only the amount of water needed for cleaning is stored. In addition, when the storage part 17 becomes full of water, the produced | generated acidic water is supplied only to the 1st water discharge currant 37. FIG.

  When the flow of alkaline ionized water is stopped, the on-off valve 12, on-off valve 13, and on-off valve 15 are opened by the control means 11, and the on-off valve 7, on-off valve 9, and on-off valve 14 are closed by the control means 11, and the anode plate Water is passed through the electrolyzed water generating apparatus 1 </ b> C in a state where the polarities of 54 and the cathode plate 55 are reversed for a predetermined time. Thus, the acidic water stored in the storage unit 17 is introduced into the raw water side of the NF membrane (reverse osmosis membrane) 41a through the concentrated water passages P5 and P7 as washing water. And the waste_water | drain which wash | cleaned NF membrane (reverse osmosis membrane) 41a is drained outside through the drainage channel P15 and the confluence | merging drainage channel P8.

  The alkaline ionized water generated in the anode chamber 52 is prevented from flowing into the introduction path P13, and the NF membrane (reverse osmosis membrane) 41a is washed using the own weight of the acidic water stored in the storage unit 17. Alternatively, the NF membrane (reverse osmosis membrane) 41a may be washed by flowing the acidic water generated in the anode chamber 52 through the introduction path P13 without reversing the polarities of the anode plate 54 and the cathode plate 55. It may be.

  Also according to this embodiment described above, the same operations and effects as those of the second embodiment can be achieved.

  Further, according to the present embodiment, the cleaning unit stores the at least part of the acidic water (electrolyzed water) generated in the electrolytic cell (electrolyzing unit) 5, and the acidity in the storing unit 17. Supply means for introducing water (electrolyzed water) to the raw water side of the NF membrane (reverse osmosis membrane) 41a. Therefore, it is not necessary to newly generate cleaning water, and the electrolyzed water generating apparatus 1C can save power and save water.

  Further, it is not necessary to provide the detour water channel P14 for generating cleaning water at the time of cleaning, and the configuration can be simplified.

(Fifth embodiment)
The electrolyzed water generating apparatus 1D according to the present embodiment has basically the same configuration as that of the first embodiment. That is, the electrolyzed water generating apparatus 1 </ b> D includes a housing 2 and a water discharger 3 attached to the housing 2. Moreover, the electrolyzed water generating apparatus 1D includes a nanofilter (a filter having at least a reverse osmosis membrane) 41 having an NF membrane (reverse osmosis membrane) 41a, a water purification unit 4 disposed in the housing 2, an anode plate 54 and a cathode plate 55 (at least a pair of electrodes), and an electrolyzer (electrolyzer) 5 for electrolyzing water (treated water).

  Moreover, also in the electrolyzed water generating apparatus 1D, as in the first embodiment, the cleaning means for cleaning the nanofilter 41, the water quality detecting means for detecting the quality of acidic water (electrolyzed water) as cleaning water, and the cleaning And a cleaning time detecting means for measuring the time for cleaning the nanofilter 41 by the means.

  Here, the electrolyzed water generating apparatus 1D according to the present embodiment is mainly different from the first embodiment in that an electrolyzer (electrolyzer) 5 as a cleaning means is disposed on the upstream side of the nanofilter 41. There is in point.

  Specifically, the water pretreated by the pretreatment unit 40 is introduced into the anode chamber 52 via the first branch channel P12 connected to the main water channel P0 via the branch portion D9. The cathode chamber 53 is introduced via the second branch path P11. The treated water introduced into the anode chamber 52 and the cathode chamber 53 is electrolyzed by applying a voltage to the anode plate 54 and the cathode plate 55, and the treated water introduced into the anode chamber 52 becomes acidic water. Then, the water is supplied from the acidic water passage 56 to the first water discharge currant 37 and discharged outside.

  On the other hand, the treated water introduced into the cathode chamber 53 becomes alkali ion water and is introduced into the nanofilter 41 from the alkaline water passage 58 through the water passages P2 and P3. And the water which permeate | transmitted NF film | membrane (reverse osmosis membrane) 41a of the nano filter 41 can be taken out from the 2nd water discharge karan 39 as alkali ion water.

  At the time of cleaning the NF membrane (reverse osmosis membrane) 41a, the acidic water generated in the cathode chamber 53 is introduced to the raw water side of the NF membrane (reverse osmosis membrane) 41a, and the drained water after cleaning is supplied to the concentrated water passages P5 and P7. And drained from the combined drainage channel P8.

  Thus, in this embodiment, the wash water is introduced into the nanofilter 41 from the water passages P2 and P3, and drained from the concentrated water passages P5 and P7 and the combined drainage passage P8.

  Also according to this embodiment described above, the same operations and effects as those of the first embodiment can be achieved.

  In addition, according to the present embodiment, the electrolytic cell (electrolysis unit) 5 as a cleaning unit is arranged on the upstream side of the nanofilter 41. For this reason, it is not necessary to separately provide a supply path for cleaning, and the configuration can be simplified.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and various modifications can be made.

  For example, in each of the above embodiments, an example using a pair of electrodes (anode and cathode) is illustrated, but it is sufficient that at least a pair of electrodes are provided, and three or more electrodes may be used.

  In addition, the water purification unit including the pretreatment unit and other detailed specifications (shape, size, layout, etc.) can be appropriately changed.

1,1A, 1B, 1C, 1D Electrolyzed water generator 4 Water purification unit 5 Electrolyzer (electrolysis unit)
17 Storage part 41 Nano filter (filter)
41a NF membrane (reverse osmosis membrane)
54 Anode plate (a pair of electrodes)
55 Cathode plate (a pair of electrodes)
P5, P7, P8 Drainage channel P13 Introduction channel

Claims (5)

An electrolyzed water generating device comprising: a filter having at least a reverse osmosis membrane; and an electrolysis unit having at least a pair of electrodes and electrolyzing water to generate electrolyzed water,
The electrolyzed water generating device includes a cleaning means for cleaning the filter,
The cleaning means includes an introduction path for introducing the electrolyzed water generated in the electrolysis section to the raw water side of the reverse osmosis membrane, a drainage path for discharging the electrolyzed water introduced to the raw water side of the reverse osmosis membrane, An electrolyzed water generating apparatus comprising:   The electrolyzed water generating device includes water quality detecting means for detecting the quality of the electrolyzed water as cleaning water, and cleaning time detecting means for measuring a time for cleaning the filter by the cleaning means. The electrolyzed water generating apparatus according to claim 1.   The electrolyzed water generating device according to claim 1, wherein the electrolyzed water generating device includes a water quality detecting unit that detects the quality of the electrolyzed water discharged from the drainage channel.   The cleaning unit includes a storage unit that stores at least a part of the electrolyzed water generated in the electrolysis unit, and a supply unit that introduces the electrolyzed water in the storage unit to the raw water side of the reverse osmosis membrane. The electrolyzed water generating apparatus according to any one of claims 1 to 3.   The electrolyzed water generating apparatus according to any one of claims 1 to 4, wherein the cleaning means is disposed on the upstream side of the filter.

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