Water electrolyzer

• US 5,378,339 A
• Filed: 08/02/1993
• Issued: 01/03/1995
• Est. Priority Date: 01/30/1992
• Status: Expired due to Fees

• Current Assignee: Techno Excel Kabushiki Kaisha
• Original Assignee: Techno Excel Kabushiki Kaisha
• Inventors: Aoki, Kazuaki, Miyazawa, Shozo, Tadokoro, Tomio
• Primary Examiner(s): Valentine, Donald R.
• Application Number:
  US08/094,044
• Time in Patent Office: 519 Days
• Field of Search: 204/257, 204/260, 204/290 F, 204/263-266, 204/255
• US Class Current: 204/260
• CPC Class Codes: C02F 1/283 using coal, charred products, or inorganic mixtures containing them
• CPC Class Codes: C02F 1/44 by dialysis, osmosis or reverse osmosis general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268
• CPC Class Codes: C02F 1/46104 Devices therefor; Their operating or servicing
• CPC Class Codes: C02F 1/4618 for producing "ionised" acidic or basic water
• CPC Class Codes: C02F 2001/46138 Electrodes comprising a substrate and a coating
• CPC Class Codes: C02F 2001/46152 characterised by the shape or form electrodes in particulate form or with conductive or non-conductive particles between them C02F1/46114
• CPC Class Codes: C02F 2001/4619 only cathodic or alkaline water, e.g. for reducing
• CPC Class Codes: C02F 2201/003 Coaxial constructions, e.g. a cartridge located coaxially within another
• CPC Class Codes: C02F 2201/4611 Fluid flow
• CPC Class Codes: C02F 2201/46115 Electrolytic cell with membranes or diaphragms
• CPC Class Codes: C02F 2201/46145 Fluid flow
• CPC Class Codes: C02F 2201/46155 Heating or cooling
• CPC Class Codes: C02F 9/00 Multistage treatment of water, waste water or sewage

Abstract

An object of the present invention is to provide a water electrolyzer, which has higher electrolyzing efficiency and smaller size than conventional ones. In an electrolyzing tank, at least three cylindrical electrodes, each of which has different polarity with respect to adjacent one, are arranged concentrically with cylindrical partitions. Surface area of the one cylindrical electrode, which is provided between other two, is equal to the sum of surface area of an outer face of the inner cylindrical electrode and that of an inner face of the outer cylindrical electrodes, so that maximum electrolyzing efficiency can be gained.

Claims

1. In a water electrolyzer comprising an electrolyzing tank, electrodes, which are mutually faced in said electrolyzing tank, and a porous partition provided between said electrodes, whereby alkali water is introduced from a cathode of said electrodes,

characterized in that:

said electrodes are a first cylindrical electrode, a second cylindrical electrode which is concentrically arranged outside of said first cylindrical electrode, and a third cylindrical electrode which is concentrically arranged outside of said second cylindrical electrode;

one of said adjacent cylindrical electrodes is a cathode and the other is an anode; and

the surface area of said second cylindrical electrode is equal to the sum of the surface area of an outer face of said first cylindrical electrode and surface area of an inner face of said third cylindrical electrode;

wherein said anode electrode is made of titanium (Ti) and coated with platinum (Pt).

2. The water electrolyzer according to claim 1,

wherein said first and said third electrodes are cathodes, and said second electrode is an anode.

3. In a water electrolyzer comprising an electrolyzing tank, electrodes, which are mutually faced in said electrolyzing tank, and a porous partition provided between said electrodes, whereby alkali water is introduced from a cathode of said electrodes,

characterized in that:

said electrodes are three cylindrical electrodes, which are concentrically arranged, one of adjacent cylindrical electrodes is a cathode and the other is an anode, each cylindrical electrode has a terminal on one end face, said partition is a cylindrical partition and concetrically arranged between adjacent cylindrical electrodes;

a branching plate for branching alkali water, which is formed on the cathode side, and acid water, which is formed on the anode side, to predetermined paths contacts the other end faces of said cylindrical electrodes with a packing made of an elastic material; and

said electrolyzing tank has a tank casing, which is capable of accommodating said cylindrical electrodes, said cylindrical partitions and said branching plate, said tank casing has outlets for the alkali water and acid water, an inlet for raw water and through-holes, through which said terminals pass, on same face, said electrolyzing tank is detachably attached.

4. The water electrolyzer according to claim 3,

wherein said cylindrical electrodes are a first cylindrical electrode, a second cylindrical electrode which is concentrically arranged outside of said first cylindrical electrode, and a third cylindrical electrode which is concentrically arranged outside of said second cylindrical electrode, one of said adjacent cylindrical electrodes is a cathode and the other is an anode, surface area of said second cylindrical electrode is equal to the sum of surface area of an outer face of said first cylindrical electrode and surface area of an inner face of said third cylindrical electrodes.

5. The water electrolyzer according to claim 3,

wherein said first and third electrodes are cathodes, and said second electrode is an anode.

6. The water electrolyzer according to claim 3,

wherein said anode electrode is made of titanium (Ti) and coated with platinum (Pt).

7. The water electrolyzer according to claim 3,

wherein said branching plate has groove paths, which is connected to the paths, through which the alkali water and acid water pass, on faces, which contact said tank casing and said packing.

8. The water electrolyzer according to claim 3,

wherein said outlets for the alkali water and acid water, said inlet for raw water and said through-holes, through which said terminals pass, are formed on a bottom face of said electrolyzing tank.