JP2016056408A - Electrode unit for electrolysis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode unit for electrolysis that can stabilize current-conduction characteristics and can lengthen the life thereof.SOLUTION: An electrode unit 1a for electrolysis comprises a first electrode 2, an ion exchange membrane 3, and a second electrode module 4, and a group of first through holes 21 of the first electrode 2 communicate with a group of second through holes 31 of the ion exchange membrane 3. A base 5 has a recessed part 51 accommodating the second electrode module 4. A cover 6 has an opening part 61 exposing the group of first through holes 21. The second electrode module 4 comprises a power supply plate 7, a plurality of silicon substrates 8 arranged side by side on a surface 71 of the power supply plate 7, and a plurality of second electrodes 9 formed on the plurality of silicon substrates 8 and each consisting of a conductive diamond film. Each surface 91 of the plurality of second electrodes 9 is partially exposed. In the electrode unit 1a for electrolysis, a laminate consisting of the ion exchange membrane 3, the plurality of second electrodes 9, and the plurality of silicon substrates 8 is sandwiched by the first electrode 2 and the power supply plate 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrode unit for electrolysis, and more particularly to an electrode unit for electrolysis used for electrolyzing a liquid.

  Conventionally, as this type of electrode unit for electrolysis, a conductive diamond film, an ion exchange sheet, and a cathode side electrode plate are arranged in three layers in this order on one plate surface that faces the thickness direction of the anode side substrate. A laminated electrolytic electrode unit is known (Patent Document 1).

  As the cathode side substrate, a conductive substrate formed using titanium, carbon, tungsten, niobium or silicon is used.

Japanese Patent No. 5427129

  In the electrolytic electrode unit described above, it may be desired to use a conductive substrate formed of silicon as the anode side substrate. This is because a conductive substrate formed using silicon has higher adhesion of the conductive diamond film than a conductive substrate formed using any of titanium, tungsten, and niobium.

  However, in the above-mentioned electrolytic electrode unit, when a conductive substrate formed using silicon is used as the anode side substrate, the conductivity of the anode side substrate is low, and it is difficult to stabilize the current-carrying characteristics, generating ozone. The amount was difficult to stabilize.

  In addition, a conductive substrate using silicon is more fragile and easily cracked than a conductive substrate using any of titanium, tungsten, and niobium.

  It is an object of the present invention to provide an electrode unit for electrolysis that can stabilize current-carrying characteristics and can achieve a long life.

  The electrode unit for electrolysis of the present invention includes a first electrode, an ion exchange membrane, a second electrode module, a base, and a cover. The first electrode is formed in a plate shape. The first electrode has a group of first through holes penetrating in the thickness direction. The ion exchange membrane is interposed between the first electrode and the second electrode module. The ion exchange membrane has a group of second through holes penetrating in the thickness direction. The group of first through holes and the group of second through holes communicate with each other through a first through hole and a second through hole that overlap in the thickness direction of the ion exchange membrane. The cover has an opening that exposes the group of first through holes. The second electrode module is formed on a power supply plate, a plurality of silicon substrates arranged side by side on the surface of the power supply plate facing the first electrode, and a plurality of silicon substrates formed on the surfaces of the plurality of silicon substrates. A plurality of second electrodes made of a conductive diamond film. In the second electrode module, a part of the surface of each of the plurality of second electrodes is exposed. A laminate of the ion exchange membrane, the plurality of second electrodes, and the plurality of silicon substrates is sandwiched between the first electrode and the power feeding plate.

  The electrode unit for electrolysis according to the present invention can stabilize energization characteristics and extend the life.

FIG. 1 is a schematic exploded perspective view of the electrode unit for electrolysis according to the first embodiment. FIG. 2 is a schematic plan view of a main part of the electrode unit for electrolysis according to the first embodiment. FIG. 3 is a schematic cross-sectional view illustrating the electrode unit for electrolysis according to the first embodiment and corresponding to the XX cross section of FIG. 2. FIG. 4 is a schematic cross-sectional view showing the electrode unit for electrolysis according to the first embodiment and corresponding to the YY cross section of FIG.

FIG. 5 is an operation explanatory diagram of the electrolyzed water generating device including the electrode unit for electrolysis of Embodiment 1. FIG. 6 is an operation explanatory diagram of the electrolyzed water generating device including the electrode unit for electrolysis of Comparative Example 1. FIG. 7 is a schematic cross-sectional view of the main part of the electrode unit for electrolysis of Comparative Example 1. FIG. 8 is a main part schematic plan view showing a first modification of the electrode unit for electrolysis according to the first embodiment. FIG. 9 shows a first modification of the electrode unit for electrolysis according to Embodiment 1, and is a schematic cross-sectional view taken along the line XX of FIG. FIG. 10 is a main part schematic plan view showing a second modification of the electrode unit for electrolysis according to the first embodiment. FIG. 11 is a schematic cross-sectional view taken along the line XX of FIG. 10, showing a second modification of the electrode unit for electrolysis according to the first embodiment. FIG. 12 is a schematic plan view of the electrode unit for electrolysis according to the second embodiment. FIG. 13 is a schematic cross-sectional view illustrating the electrode unit for electrolysis according to the second embodiment and corresponding to the XX cross-section of FIG. 12. FIG. 14 is an operation explanatory diagram of the electrode unit for electrolysis of Comparative Example 2.

  Each drawing described in the following first and second embodiments is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. In addition, the materials, numerical values, and the like described in Embodiments 1 and 2 are only preferable examples, and are not intended to be limited thereto. Furthermore, the present invention can be appropriately modified in configuration without departing from the scope of its technical idea.

(Embodiment 1)
Below, the electrode unit 1a for electrolysis of this embodiment is demonstrated based on FIGS.

  The electrode unit for electrolysis 1 a includes a first electrode 2, an ion exchange membrane 3, a second electrode module 4, a base 5, and a cover 6. The first electrode 2 is formed in a plate shape. The first electrode 2 has a group of first through holes 21 penetrating in the thickness direction. The ion exchange membrane 3 is interposed between the first electrode 2 and the second electrode module 4. The ion exchange membrane 3 has a group of second through holes 31 penetrating in the thickness direction. The first through hole 21 and the second through hole 31 that overlap in the thickness direction of the ion exchange membrane 3 communicate with the group of first through holes 21 and the group of second through holes 31. The cover 6 has an opening 61 that exposes the group of first through holes 21. The second electrode module 4 is formed on the power supply plate 7, the plurality of silicon substrates 8 arranged side by side on the surface 71 facing the first electrode 2 in the power supply plate 7, and the surfaces 81 of the plurality of silicon substrates 8. And a plurality of second electrodes 9 each made of a conductive diamond film. In the second electrode module 4, a part of the surface 91 of each of the plurality of second electrodes 9 is exposed. In the electrode unit 1 a for electrolysis, a laminate of the ion exchange membrane 3, the plurality of second electrodes 9, and the plurality of silicon substrates 8 is sandwiched between the first electrode 2 and the power supply plate 7. With the configuration described above, the electrolysis electrode unit 1a can stabilize the current-carrying characteristics and extend the life. In the electrolysis electrode unit 1a, the base 5 and the cover 6 are preferably connected by a plurality of screws 56 (hereinafter also referred to as “first screws 56”).

  The electrode unit 1a for electrolysis is a preferable embodiment in which, for example, a laminate of the first electrode 2, the ion exchange membrane 3, and the second electrode module 4 is sandwiched between the base 5 and the cover 6. Thereby, the electrode unit 1a for electrolysis aims at the further stabilization of an electricity supply characteristic compared with the other one form which has couple | bonded the 1st electrode 2 and the electric power feeding board 7 with the electrically insulating screw, for example. Is possible. Moreover, the electrode unit 1a for electrolysis can protect the laminated body of the laminated body of the 1st electrode 2, the ion exchange membrane 3, and the 2nd electrode module 4 with the base 5 and the cover 6, and handling is possible. It becomes easy. The electrode unit 1a for electrolysis has, for example, the ion exchange membrane 3 even when the laminate of the first electrode 2, the ion exchange membrane 3 and the second electrode module 4 is sandwiched between the base 5 and the cover 6. And a plurality of second electrodes 9 and a plurality of silicon substrates 8 are sandwiched between the first electrode 2 and the power supply plate 7.

  The base 5 preferably has a recess 51 for accommodating the second electrode module 4. As a result, the electrode unit for electrolysis 1a can stably hold the second electrode module 4 between the base 5 and the cover 6.

The electrode unit for electrolysis 1a can be used by supplying a direct current from an external power source 10 (see FIG. 5) so that the first electrode 2 forms a cathode and the second electrode 9 forms an anode. . Here, the electrode unit 1a for electrolysis includes a first electric wire 11 electrically connected to the first electrode 2 and a second electric wire 12 electrically connected to the power supply plate 7 of the second electrode module 4. It is preferable to provide. What is necessary is just to set the current density of the direct current output from the power supply 10 suitably in the range of about 0.01-1 A / cm < ² >, for example.

  As shown in FIG. 5, the electrolyzed water generating apparatus 100 including the electrode unit for electrolysis 1a includes a housing 110 that houses the electrode unit for electrolysis 1a. The housing 110 includes a housing main body 120, an inflow pipe 130, and an outflow pipe 140. Thereby, in the electrolyzed water generating apparatus 100, the fluid flowing in from the inflow pipe 130 flows toward the outflow pipe 140 along the surface of the electrode unit for electrolysis 1a. The fluid is, for example, tap water. The flow rate of tap water is, for example, about 0.1 to 10 L / min.

  The housing body 120 includes a cylindrical cylindrical body 121, a first flange 124 formed to protrude outward from the first axial end 122 of the cylindrical body 121, and a second axial end of the cylindrical body 121. A second flange 125 projecting outward from the portion 123. The inflow pipe 130 includes a cylindrical pipe portion 131 and a third flange 134 formed to protrude outward from the first end portion 132 in the axial direction of the pipe portion 131. The outflow pipe 140 includes a cylindrical pipe part 141 and a fourth flange 145 formed to protrude outward from the first end part 142 in the axial direction of the pipe part 141. In the housing 110, the first flange 124 of the housing body 120 and the third flange 134 of the inflow pipe 130 are overlapped and coupled by a plurality of screws (second screws). On the respective opposing surfaces of the first flange 124 and the third flange 134, annular grooves 164 and 174 for accommodating the first O-ring 151 approximately in half are formed. In addition, the housing 110 has a second flange 125 of the housing main body 120 and a fourth flange 145 of the outflow pipe 140 overlapped and coupled by a plurality of screws (third screws). On the respective opposing surfaces of the second flange 125 and the fourth flange 145, annular grooves 165 and 175 for accommodating the second O-ring 152 are formed.

The electrode unit for electrolysis 1a can generate electrolyzed water by electrolyzing tap water, for example. The electrolyzed water is ozone water. Ozone water means water in which ozone (O ₃ ) is dissolved. In the electrolyzed water generating apparatus 100, ozone water generated by electrolyzing tap water flowing from the inlet 111 of the housing 110 flows out from the outlet 112 of the housing 110. In the electrolyzed water generating apparatus 100, the electrolysis electrode unit 1a is accommodated in the housing 110 so that the longitudinal direction of the electrolysis electrode unit 1a is aligned with the direction connecting the inflow port 111 and the outflow port 112. In the electrode unit 1a for electrolysis, ozone generated on the surface 91 of the second electrode 9 made of a conductive diamond film is dissolved in tap water through the second through hole 31 and the first through hole 21 in molecular order.

The electrolysis electrode unit 1a supplies electrons to e ⁻ when a DC voltage is supplied so that the first electrode 2 constitutes a cathode and the second electrode 9 constitutes an anode in a state where tap water is supplied. Then, current flows and the following electrochemical reaction is considered to occur in each of the anode and the cathode.
Anode; 3H ₂ O → O ₃ + 6H ⁺ + 6e ⁻
Cathode; 2H ⁺ + 2e ⁻ → H ₂
That is, ozone is generated at the anode by the electrochemical reaction described above. At the cathode, hydrogen molecules (H ₂ ) are generated by the electrochemical reaction described above. At the cathode, hydrogen ions (H ⁺ ) react with electrons flowing from the power supply 10 to generate hydrogen molecules (H ₂ ). The ion exchange membrane 3 has a function of guiding hydrogen ions generated on the anode side to the cathode side. In the electrode unit for electrolysis 1a, the ion exchange membrane 3 is interposed between the anode and the cathode, so that the electrochemical reaction on the anode side and the cathode side proceeds promptly.

  In the electrode unit for electrolysis 1 a, the first electric wire 11 is connected to the first connection piece 23 protruding from the side surface of the first electrode 2. The 1st electric wire 11 is an insulation covering electric wire, and the exposed 1st conductor part 11b is wound around the 1st connection piece 23, and is electrically connected. In the electrode unit for electrolysis 1a, the first connection piece 23 and the first conductor portion 11b are covered with a tape having ozone resistance, waterproofness, and electrical insulation.

  Since the above-described electrode unit for electrolysis 1a is used in a liquid, it is difficult to connect the second electric wire 12 to the silicon substrate 8. For this reason, the electrode unit 1a for electrolysis has the 2nd electric wire 12 connected to the electric power feeding board 7. FIG. More specifically, in the electrolysis electrode unit 1 a, the second electric wire 12 is connected to the second connection piece 73 protruding from the side surface of the power supply plate 7. The second electric wire 12 is an insulation-coated electric wire, and the exposed second conductor portion 12b is wound around the second connection piece 73 to be electrically connected. In the electrode unit for electrolysis 1a, the second connection piece 73 and the second conductor portion are covered with a tape having ozone resistance, waterproofness, and electrical insulation.

  In the electrode unit 1a for electrolysis, tap water is assumed as a liquid to be electrolyzed, but is not limited thereto, for example, pure water, other water, a solution in which an electrolyte is dissolved in a solvent such as water, or the like. But you can.

  Each component of the electrode unit 1a for electrolysis is demonstrated in detail below.

  The first electrode 2 has a long rectangular shape in plan view. The first electrode 2 has a length in the longitudinal direction in plan view of 60 mm and a length in the short direction of 20 mm. The thickness of the first electrode 2 is 1 mm.

  The material of the first electrode 2 is preferably a material having high corrosion resistance, such as stainless steel. Examples of stainless steel include austenitic stainless steel. As the austenitic stainless steel, for example, SUS304 can be adopted. Since the first electrode 2 generates hydrogen molecules, a material that is not embrittled by hydrogen is preferable. For example, titanium, zirconium, nickel, or the like may be employed instead of stainless steel. Further, the material of the first electrode 2 is preferably a material excellent in oxidation resistance.

  A plurality of holes 22 through which the shaft portions of the plurality of first screws 56 pass are formed in the peripheral portion of the first electrode 2.

  The group of first through holes 21 are arranged at equal intervals in the longitudinal direction of the first electrode 2. The opening shape of the first through hole 21 is a long hole shape.

  As the ion exchange membrane 3, for example, an ion exchange film having proton conductivity can be used. The thickness of the ion exchange membrane 3 can be 50-500 micrometers, for example.

  Since hydrogen ions are protons, they can pass through the ion exchange membrane 3. The ion exchange membrane 3 has hydrogen ion selective permeability. The ion exchange membrane 3 has ion conductivity but does not have electron conductivity. The ion exchange membrane 3 can be composed of, for example, an ion conductive membrane made of a solid polymer membrane having high hydrogen ion conductivity. The ion exchange membrane 3 is a cation exchange membrane. The cation exchange membrane is a membrane having a cation exchange ability.

  Examples of the material for the ion exchange membrane 3 include perfluorosulfonic acid-based fluororesins.

  A plurality of holes 32 through which the shaft portions of the plurality of first screws 56 pass are formed in the peripheral portion of the ion exchange membrane 3.

  The group of second through holes 31 are arranged at equal intervals in the longitudinal direction of the ion exchange membrane 3. The opening shape of the second through hole 31 is a long hole shape.

  The first through hole 21 and the second through hole 31 that overlap in the thickness direction of the ion exchange membrane 3 have substantially the same opening shape. Is a preferred embodiment. The group of second through holes 31 are preferably formed in the same direction as the array of the group of first through holes 21 in the same direction.

  The power feeding plate 7 has a long rectangular shape in plan view viewed from the surface 71 side. The power supply plate 7 has a length in the longitudinal direction of 50 mm and a length in the short direction of 10 mm. The thickness of the power supply plate 7 is 0.5 mm. The power supply plate 7 is preferably a rigid body.

  Titanium is employed as the material of the power supply plate 7, but is not limited thereto, and any material having higher conductivity than the silicon substrate 8 may be used. For example, copper, stainless steel, or the like may be employed. The material of the power supply plate 7 is more preferably a material excellent in oxidation resistance.

  In the second electrode module 4, each silicon substrate 8 has a size corresponding to one when a silicon substrate having the same planar view shape and the same size as the power supply plate 7 is equally divided into a plurality of cross sections orthogonal to the longitudinal direction. Is formed. More specifically, the second electrode module 4 has a size corresponding to one when each silicon substrate 8 is obtained by equally dividing a silicon substrate of the same size and the same size as the power supply plate 7 into four. Is formed. In the second electrode module 4, four silicon substrates 8 are arranged side by side in the longitudinal direction of the power supply plate 7 without a gap on the surface 71 of the power supply plate 7. Arranged without a gap means that the adjacent silicon substrates 8 are arranged in contact with each other without separating the adjacent silicon substrates 8 from each other. The second electrode module 4 is arranged such that all the silicon substrates 8 are arranged in a straight line without a gap.

  The silicon substrate 8 has a rectangular shape (right-angled quadrilateral) when viewed from the surface 81 side. The thickness of the silicon substrate 8 is 525 μm.

  The silicon substrate 8 preferably has high conductivity. In other words, the silicon substrate 8 preferably has a low resistivity. For example, the resistivity of the silicon substrate 8 is preferably 0.001 to 20 Ωcm, and more preferably 0.001 to 10 Ωcm.

  The second electrode 9 has a rectangular shape when viewed from the surface 91 side. The second electrode 9 has a planar size set to 12.5 mm × 10 mm. A rectangular shape is adopted as the rectangular shape, but is not limited thereto, and may be a square shape.

  The conductive diamond film constituting the second electrode 9 is preferably a p-type diamond film. In the p-type diamond film, the acceptor impurity is preferably boron. In the second electrode module 4, the conductivity type of the silicon substrate 8 and the conductivity type of the conductive diamond film are preferably the same. The resistivity of the p-type diamond film is preferably 0.01 to 10 Ωcm, and more preferably 0.01 to 1 Ωcm.

  The thickness of the conductive diamond film can be set to 1 μm, for example. The conductive diamond film can be formed by, for example, a plasma CVD method, a hot filament CVD method, or the like.

  The conductive diamond film constituting the second electrode 9 is preferably a polycrystalline diamond film having conductivity. At present, the p-type diamond film as the conductive diamond film is preferably a single crystal p-type silicon substrate from the viewpoint of easily forming a film having a lower resistivity than the n-type diamond film. The surface 81 of the silicon substrate 8 is preferably a (100) plane. Further, the surface 81 of the silicon substrate 8 preferably has an off angle from the (100) plane of 0 to 0.3 °.

  In the second electrode module 4, the second electrode 9 made of a conductive diamond film is laminated on the surface 81 of the silicon substrate 8, but the thickness of the conductive diamond film is sufficiently larger than the thickness of the silicon substrate 8. It is thin. The second electrode 9 has substantially the same shape as the silicon substrate 8. Therefore, the 2nd electrode module 4 is arrange | positioned so that all the 2nd electrodes 9 may be located in a line on a straight line. The second electrode 9 is preferably formed so as to cover the entire surface 81 of the silicon substrate 8. The second electrode 9 may be formed so as to cover the surface 81 and the side surface of the silicon substrate 8.

  The base 5 has a long rectangular shape in plan view as viewed from the surface 501 side. The base 5 has a length in the longitudinal direction of 60 mm and a length in the short direction of 20 mm. The thickness of the base 5 is 1.5 mm.

  In the base 5, the opening shape of the recess 51 is a long rectangular shape. The recess 51 is formed in a size that can accommodate the power supply plate 7 and the plurality of silicon substrates 8. The length of the concave portion 51 in the longitudinal direction is preferably substantially the same as the length of the power feeding plate 7 in the longitudinal direction. The length of the concave portion 51 in the short direction is preferably substantially the same as the length of the power feeding plate 7 in the short direction. In addition to the surface 501 side facing the cover 6, one of the four side surfaces of the concave portion 51 of the base 5 is open. Thereby, the electrode unit 1a for electrolysis can improve assembly property.

  In the base 5, the depth of the recess 51 is set to be slightly smaller than the total thickness of the thickness of the power supply plate 7, the thickness of the silicon substrate 8, and the thickness of the second electrode 9. Thereby, the electrode unit 1a for electrolysis can improve the adhesiveness between the second electrode 9 and the ion exchange membrane 3. More specifically, in the base 5, the depth of the recess 51 is 0.9 mm. For example, the material of the base 5 is preferably a material having ozone resistance and corrosion resistance, and a resin is preferable from the viewpoint of cost reduction. Examples of the resin include an acrylic resin and an ABS resin.

  A screw hole 52 into which the shaft portion of the first screw 56 is fitted is formed in the peripheral portion of the base 5.

  The cover 6 has a long rectangular shape as viewed from the surface 60 side in plan view. The cover 6 has a length in the longitudinal direction of 60 mm and a length in the short direction of 20 mm. The thickness of the cover 6 is 1 mm. The opening 61 of the cover 6 has a long rectangular shape. In short, the cover 6 is formed in a rectangular frame shape as a whole.

  The cover 6 preferably has an opening shape of the opening 61 substantially the same as the outer shape of the second electrode module 4.

  The material of the cover 6 is preferably a material having ozone resistance and corrosion resistance, for example, and a resin is preferable from the viewpoint of cost reduction. Examples of the resin include an acrylic resin and an ABS resin.

  A hole 62 through which the shaft portion of the first screw 56 is inserted is formed in the peripheral portion of the cover 6.

  The first screw 56 is preferably formed of resin. Examples of the resin forming the first screw 56 include an acrylic resin and an ABS resin.

  In assembling the electrode unit 1a for electrolysis, the power feeding plate 7 is placed on the inner bottom surface of the recess 51 of the base 5, and a plurality of silicon substrates 8 on which the second electrodes 9 have been previously formed are placed on the surface 71 of the power feeding plate 7. . In assembling the electrode unit for electrolysis 1a, thereafter, the ion exchange membrane 3 is placed on the surface 501 and each second electrode 9 in the base 5, the first electrode 2 is placed on the ion exchange membrane 3, and the first electrode 2 is placed on the surface. Put the cover 6 on. In assembling the electrode unit for electrolysis 1 a, the cover 6 and the base 5 are coupled by the plurality of first screws 56. More specifically, the tip of the shaft portion of the first screw 56 inserted into the hole 62 of the cover 6, the hole 22 of the first electrode 2, and the hole 32 of the ion exchange membrane 3 from the surface 60 side of the cover 6 is connected to the base 5. Are fitted into the screw holes 52. Thereby, in the electrode unit for electrolysis 1 a, the laminate of the first electrode 2, the ion exchange membrane 3, and the second electrode module 4 is sandwiched between the base 5 and the cover 6. The electrode unit 1a for electrolysis can make the 1st electrode 2 and each 2nd electrode 9 closely_contact | adhere with the ion exchange membrane 3, and can improve the contact property of each 2nd electrode 9 and the electric power feeding board 7. FIG. It becomes.

  The electrode unit 1a for electrolysis is formed on the power supply plate 7 having higher conductivity than the silicon substrate 8, the plurality of silicon substrates 8, and the surfaces 81 of the plurality of silicon substrates 8, each of which is made of a plurality of conductive diamond films. The second electrode module 4 is configured by combining the second electrode 9. Thereby, the electrode unit 1a for electrolysis is the comparative example 1 which comprised the 2nd electrode module 4 with the one electric power feeding board 7, the one silicon substrate 8, and the one 2nd electrode 9 as shown in FIG. Compared to the electrolysis electrode unit 1r, it is possible to improve the energization characteristics. That is, in the electrode unit 1r for electrolysis of the comparative example 1, as shown in FIG. 7, the surface 71 of the power supply plate 7 and the back surface 82 of the silicon substrate 8 are stably caused by the warp and undulation of the power supply plate 7. May be difficult to contact. Here, the silicon substrate 8 has a problem that its conductivity is lower than that of metal or the like and its conductivity is lower than that of the power supply plate 7. For this reason, in the electrode unit 1r for electrolysis of the comparative example 1, if the power feeding plate 7 is warped or undulated, the current supply to the second electrode 9 is hindered. However, in the electrode unit 1r for electrolysis of the comparative example 1, if the tightening force of the first screw 56 is increased so as to flatten the power feeding plate 7, the silicon substrate 8 may be broken. On the other hand, the electrode unit 1a for electrolysis according to the present embodiment can stably contact the front surface of the power supply plate 7 and the back surface 82 of each silicon substrate 8, and supplies power to each second electrode 9 substantially uniformly. It becomes possible to do. By appropriately adjusting the tightening force of the first screw 56, the electrode unit 1a for electrolysis can press the power feeding plate 7 and each silicon substrate 8 while preventing each silicon substrate 8 from cracking. . Therefore, the electrolysis electrode unit 1a can improve the generation efficiency of ozone. The ozone generation efficiency can be determined from, for example, the concentration of ozone in water. The concentration of ozone can be measured by, for example, the indigo method (ultraviolet absorption method), the KI method, or the like.

  In addition, about the electrode unit 1r for electrolysis of the comparative example 1, since it is substantially the same structure as the electrode unit 1a for electrolysis, the same code | symbol is attached | subjected to the component similar to the electrode unit 1a for electrolysis. FIG. 6 shows an electrolyzed water generating apparatus 101 including the electrode unit 1r for electrolysis of Comparative Example 1. Moreover, since the electrolyzed water generating apparatus 101 has substantially the same configuration as that of the electrolyzed water generating apparatus 100, the same components as those in the electrolyzed water generating apparatus 100 are denoted by the same reference numerals.

  The electrode unit 1a for electrolysis is preferably laid out so that the group of first through holes 21 and the group of second through holes 31 do not expose the boundary between the second electrodes 9. Thereby, the electrode unit 1a for electrolysis becomes possible to suppress that the 2nd electrode 9 peels from the silicon substrate 8 more.

  Below, the electrolyzed water generating apparatus 100 provided with the electrode unit 1a for electrolysis is further demonstrated.

  The housing 110 is preferably formed of a material having electrical insulation. That is, it is preferable that the housing main body 120, the inflow pipe 130, and the outflow pipe 140 are formed of an electrically insulating material. As a material of the housing main body 120, the inflow pipe 130, and the outflow pipe 140, for example, an acrylic resin or the like can be employed.

  The inflow pipe 130 is preferably set to have an outer diameter of the pipe portion 131 so that, for example, a water hose can be connected. The hose is made of, for example, plastic, rubber, vinyl, metal, or the like.

  Moreover, it is preferable that the outer diameter of the pipe part 141 is set so that the outflow pipe 140 can connect the hose for waterworks.

  The electrolysis electrode unit 1a is preferably arranged in the housing body 120 so that the thickness direction thereof is aligned with the radial direction of the housing body 120.

  In the electrolyzed water generating apparatus 100, the housing 110 preferably includes a support portion that supports the electrode unit for electrolysis 1a. The support portion can be configured by a protrusion, a recess, or the like provided on the inner surface of the housing 110. The electrode unit 1a for electrolysis may be fixed to the housing 110 with a screw or an adhesive, for example.

  The electrolyzed water generating apparatus 100 can be installed on a washstand, for example. More specifically, the electrolyzed water generating apparatus 100 is preferably used with a housing 110 interposed in the middle of a water pipe that sends tap water to a faucet of a wash basin. In the electrolyzed water generating apparatus 100, the housing 110 is preferably installed in the vicinity of the discharge port on the upstream side of the discharge port of the faucet.

  The power supply 10 is preferably disposed outside the housing 110. The power supply 10 may be assembled integrally with the housing 110 or may be provided apart from the housing 110. The electrolyzed water generating apparatus 100 is not limited to the form including the power supply 10 as a constituent element, and may be a form not including the power supply 10.

  In the electrolyzed water generating apparatus 100, tap water that has flowed into the housing 110 from the inlet 111 of the housing 110 passes through the first through hole 21 and the second through hole 31 in the electrode unit 1 a for electrolysis, and each second electrode 9. Is supplied to a part of the surface 91. Thereby, in the electrolyzed water generating apparatus 100, ozone can be generated in each of the second electrodes 9. In FIG. 5, the flowing direction of ozone generated in each of the second electrodes 9 is schematically illustrated by a two-dot chain line arrow. Ozone generated in each second electrode 9 is dissolved in tap water. Therefore, the electrolyzed water generating apparatus 100 can generate ozone water.

  8 and 9 show an electrode unit for electrolysis 1b of a first modification. The electrolysis electrode unit 1b of the first modification is different from the electrolysis electrode unit 1a of the first embodiment in the arrangement of the group of first through holes 21 and the group of second through holes 31. In addition, about the electrode unit 1b for electrolysis of a 1st modification, the same code | symbol is attached | subjected to the component similar to the electrode unit 1a for electrolysis of Embodiment 1, and description is abbreviate | omitted.

  In the electrode unit for electrolysis 1b of the first modified example, the first through holes 21 of the first electrode 2 have a long hole shape that straddles all the second electrodes 9 in the direction along the arrangement direction of the plurality of second electrodes 9. It is formed into a shape. The group of first through holes 21 are arranged in a direction orthogonal to the arrangement direction of the second electrodes 9 in plan view. Similar to the first through holes 21, the second through holes 31 of the ion exchange membrane 3 are formed in a long hole shape extending over all the second electrodes 9 in the direction along the arrangement direction of the plurality of second electrodes 9. ing. Similar to the group of first through holes 21, the group of second through holes 31 are arranged in a direction orthogonal to the arrangement direction of the second electrodes 9 in plan view.

  10 and 11 show an electrode unit for electrolysis 1c of a second modification. The electrolysis electrode unit 1c of the second modification is different from the electrolysis electrode unit 1a of the first embodiment in the arrangement of the group of first through holes 21 and the group of second through holes 31. In addition, about the electrode unit 1c for electrolysis of a 2nd modification, the same code | symbol is attached | subjected to the component similar to the electrode unit 1a for electrolysis of Embodiment 1, and description is abbreviate | omitted.

  As for the electrode unit 1c for electrolysis of the 2nd modification, the 1st through-hole 21 of the 1st electrode 2 is formed in the circular shape. The group of first through holes 21 are arranged in a two-dimensional array. More specifically, the group of first through holes 21 are arranged in the arrangement direction of the second electrodes 9 and the direction orthogonal to the arrangement direction in plan view. Similar to the first through hole 21, the second through hole 31 of the ion exchange membrane 3 is formed in a circular shape. The group of second through holes 31 are arranged in a two-dimensional array like the group of first through holes 21. More specifically, the group of second through holes 31 are arranged in the arrangement direction of the second electrodes 9 and the direction orthogonal to the arrangement direction in plan view.

(Embodiment 2)
Below, the electrode unit 1d for electrolysis of this embodiment is demonstrated based on FIG.

  The electrode unit 1d for electrolysis of this embodiment is different in that the adjacent second electrodes 9 among the plurality of second electrodes 9 are arranged apart from each other. It differs from the electrode unit 1a for electrolysis of Embodiment 1 in that a rectifying plate 15 is provided between the adjacent second electrodes 9 among the plurality of second electrodes 9 on the surface 71 of the power feeding plate 7. . The electrolysis electrode unit 1d according to the present embodiment has substantially the same configuration as the electrolysis electrode unit 1a according to the first embodiment. Therefore, the same components as those of the electrolysis electrode unit 1a according to the first embodiment are denoted by the same reference numerals. The description is omitted.

  In the electrolysis electrode unit 1 s of Comparative Example 2 shown in FIG. 14, a plurality of silicon substrates 8 are arranged apart from each other in the longitudinal direction of the power feeding plate 7. In short, in the electrode unit 1s for electrolysis of Comparative Example 2, the adjacent silicon substrates 8 are arranged apart from each other, and the adjacent second electrodes 9 are also arranged apart from each other. In the electrolysis electrode unit 1s of Comparative Example 2, the flow of tap water stays in the groove formed between the adjacent silicon substrates 8, and the efficiency of ozone dissolution in tap water is reduced. It becomes easy to become a bubble. FIG. 14 schematically shows the direction of the flow of a liquid such as tap water with a dashed-dotted arrow.

  In contrast, in the electrode unit for electrolysis 1d of the present embodiment, the adjacent second electrodes 9 among the plurality of second electrodes 9 are arranged apart from each other, and the adjacent second electrodes among the plurality of second electrodes 9 are arranged. A rectifying plate 15 disposed on the surface 71 of the power supply plate 7 is provided between the electrodes 9. Thereby, the electrode unit 1d for electrolysis can suppress the occurrence of stagnation of liquid such as tap water, and can also suppress the generation of bubbles. Accordingly, the electrode unit for electrolysis 1d can suppress, for example, a decrease in electrolysis efficiency and a decrease in ozone dissolution efficiency, and a decrease in ozone concentration. In the electrode unit 1d for electrolysis, it is preferable that the rectifying plate 15, the silicon substrate 8, and the second electrode 9 are arranged without gaps. The material of the rectifying plate 15 is preferably a material having electrical insulation. As a material of the current plate 15, for example, an acrylic resin, an ABS resin, or the like can be used.

  The thickness of the rectifying plate 15 is preferably the same as the combined thickness of the silicon substrate 8 and the second electrode 9. Thereby, the electrode unit for electrolysis 1d can suppress the formation of a groove between the adjacent second electrodes 9. The thickness of the rectifying plate 15 is not limited to the case where it is strictly the same as the total thickness of the silicon substrate 8 and the second electrode 9, but may be substantially the same. Here, “substantially the same” means that the thickness of the rectifying plate 15 is 90 to 110% of the total thickness of the silicon substrate 8 and the second electrode 9.

  By the way, the electrolyzed water generating apparatus 100 (see FIG. 5) described in Embodiment 1 may employ any of the other electrolysis electrode units 1b, 1c, and 1d instead of the electrolysis electrode unit 1a. In addition, the electrolysis electrode units 1b, 1c, and 1d are preferably provided with the base 5 and the cover 6 in the same manner as the electrolysis electrode unit 1a.

1a, 1b, 1c, 1d Electrode unit for electrolysis 2 First electrode 3 Ion exchange membrane 4 Second electrode module 5 Base 6 Cover 7 Feed plate 8 Silicon substrate 9 Second electrode 15 Current plate 21 First through hole 31 Second through hole Hole 51 Recess 61 Opening 81 Surface 91 Surface

Claims (4)

A first electrode, an ion exchange membrane, and a second electrode module;
The first electrode is formed in a plate shape and has a group of first through holes penetrating in the thickness direction,
The ion exchange membrane is interposed between the first electrode and the second electrode module, and has a group of second through holes penetrating in the thickness direction,
The group of first through holes and the group of second through holes communicate with each other through the first through hole and the second through hole overlapping in the thickness direction of the ion exchange membrane,
The cover has an opening that exposes the group of first through holes;
The second electrode module is formed on a power supply plate, a plurality of silicon substrates arranged side by side on the surface of the power supply plate facing the first electrode, and a plurality of silicon substrates formed on the surfaces of the plurality of silicon substrates. A plurality of second electrodes made of a conductive diamond film, and a part of the surface of each of the plurality of second electrodes is exposed,
A stack of the ion exchange membrane, the plurality of second electrodes, and the plurality of silicon substrates is sandwiched between the first electrode and the power supply plate,
The electrode unit for electrolysis characterized by the above-mentioned. A base and a cover;
A laminate of the first electrode, the ion exchange membrane, and the second electrode module is sandwiched between the base and the cover.
The electrode unit for electrolysis according to claim 1. The base has a recess for accommodating the second electrode module.
The electrode unit for electrolysis according to claim 2, wherein: The adjacent second electrodes among the plurality of second electrodes are arranged apart from each other,
Between the second electrodes adjacent to each other among the plurality of second electrodes, comprising a rectifying plate disposed on the surface of the power supply plate,
The electrode unit for electrolysis according to any one of claims 1 to 3, wherein:

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