JP3757352B2 - Electrolyzer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrolysis method capable of electrolyzing an aqueous solution containing halogen ions to produce sterilized washing water for sterilizing and washing medical tools, tableware / food, fingers, etc., and an electrolysis apparatus therefor. is there.
[0002]
[Prior art]
In conventional methods, platinum-plated titanium electrode plates have been used for electrodes that produce electrolyzed water with sterilizing and detergency, especially anodes that are strongly acidic and highly oxidative, but they can withstand long-term use. The nickel ferrite electrode (Japanese Patent Application No. 51-83246) developed by Tokyo Denki Kagaku Kogyo Co., Ltd. has good corrosion resistance and is used instead. When it is raised, the terminal portion generates heat, and the ferrite is damaged due to thermal strain, and the plastic case of the electrolytic reaction device is thermally expanded and deformed.
[0003]
The inventor has applied for the following patent regarding the ferrite electrode.
(1) Japanese Patent Application No. 9-369487 “electrolysis device”
(2) Japanese Patent Application No. 10-134509 “Electrolysis Device”
In these inventions, the conventional hand-washing sterilizing water apparatus can achieve a long-term durability performance of 3 to 5 times that of a platinum-plated titanium electrode under the same conditions. However, there is a problem that the terminal portion generates heat when the current value is increased in order to increase the sterilizing and cleaning effect. Further, there is a demand for a more compact and compact sterilized washing water generator for easy installation in a small place such as a home or hospital room.
[0004]
[Problems to be solved by the invention]
In order to solve these problems, an object of the present invention is to provide a small electrolyzer having high long-term durability performance and high electrolysis efficiency even when the amount of current per electrode area is increased.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the present invention, a nickel ferrite is used in order to prevent the plastic case from being thermally expanded and deformed due to overheating of the electrode even if the electrolysis apparatus is made compact and compact and used for a long time. The whole was made cylindrical so that the terminal connection of the anode was improved and a strong structure was easily obtained.
[0006]
A plurality of anodes and cathodes are arranged alternately, concentrically spaced apart from each other, and arranged to overlap, and an aqueous solution containing halogen ions between the electrodes is electrolyzed to produce sterilized washing water. However, we decided to use a nickel ferrite electrode that is cheaper than platinum and has high corrosion resistance after platinum.
[0007]
At the anode, halogen ions are precipitated as chlorine or bromine and immediately react with water to produce a strong acid such as hydrochloric acid. In addition, the anode is required to have an electrode with high corrosion resistance in a strong oxidizing environment. The ferrite selected from the past achievements is not high in electrical conductivity unlike ordinary metals, and since it is ceramic, it is hard and brittle, so it is difficult to join the terminals by welding etc. by conventional methods. In the invention, the contact area between the terminal and the ferrite electrode is sufficiently increased and the conductivity of the contact portion is improved.
In addition, when using a ferrite pipe as a cylindrical anode, simply attaching a terminal to the end of a long pipe results in insufficient electrical conduction, so two ferrite pipes with different outer diameters of 1 to 5 mm and their When a conductive metal pipe having a thickness of about 1 mm with an intermediate diameter is coaxially stacked, a low melting point metal melted by heating and melting is injected into the gap between them, and the conductive metal pipe is energized as a terminal body. Electricity can flow with low resistance through the inner and outer anodic ferrite pipes.
In this case, efficient electrolysis can be achieved by arranging a corrosion-resistant conductive metal tube as the cathode with a distance of 0.5 to 5.0 mm between the inside and outside of the two-layered anode ferrite pipe as the cathode. Can be done. By repeating the same process, it is possible to manufacture more layers of coaxial multilayer cylindrical electrolyzers.
[0008]
In the present invention, the anode (1) at the center of the cylindrical structure is a ferrite round bar or a round tube having a long hole in the central axis direction, and a conductive metal bar slightly smaller than the hole diameter is used as the terminal body ( 5), inserted into the entire surface of the metal rod terminal body and the hole between the outer periphery of the metal rod terminal body and the soft, low melting point metal joint (6), and the outside of the long anode It is preferable to arrange the corrosion-resistant metal tubes concentrically as the cathode (2) with a distance between the electrodes of 0.5 to 5.0 mm.
[0009]
As the metal rod terminal body (5), a commonly used material such as copper, gun metal, brass, iron, stainless steel, titanium, etc. is used, and a long hole drilled in the central axis direction of the anodic ferrite round rod (1) ( 7) A soft conductive low melting point metal joint (6) is inserted in advance, and the conductive metal bar terminal body (5) threaded on its outer periphery is screwed into a long ferrite and a long Since the metal bar terminal contacts in a wide area, and a soft conductive metal tube with a low melting point is inserted between them, the metal bar terminal body is screwed in to fill the gap between the terminal and the ferrite, and from the terminal The electrical conduction to the ferrite is very good and the voltage does not increase even if the current value is increased. That is, abnormal heat generation at the terminal portion can be suppressed.
[0010]
When the conductive metal bar terminal body (5) is screwed, a soft conductive metal having a low melting point, for example, a low melting point alloy having a melting point of 80 to 180 ° C. is heated to a fluid level or is liquid at room temperature. The use of some mercury further improves the electrical conduction from the terminal to the ferrite.
[0011]
The cylindrical anode and cathode are alternately arranged concentrically with a distance between the poles and overlapped to form an electrolysis apparatus. The anode (1) at the center has a long hole (7 ) A ferrite round bar or round tube with a soft conductive low-melting-point metal tube with a thickness of 0.5 to 1 mm inserted in the long hole, and slightly smaller than the hole diameter. When a conductive metal rod threaded is inserted as a terminal body (5), the metal rod terminal body is screwed in and a soft conductive metal is sandwiched between the outer periphery of the terminal body and the hole. In addition, a long terminal contacts the ferrite in a wide area inside the long rod-shaped anode, and the electrode can be sufficiently energized at a low voltage. By arranging a corrosion-resistant metal tube concentrically as a cathode at a distance of 0.5 to 5.0 mm outside the long anode, feeding an aqueous solution containing halogen ions between the electrodes, and electrolyzing the tube The electrolyzer that produces sterilized washing water can have a long life and can be miniaturized.
[0012]
When inserting the conductive metal rod terminal body, the low-melting point soft conductive metal is heated to the extent that fluidity is obtained, or by using mercury, which is liquid at room temperature, electrical conduction from the terminal to the ferrite can be achieved. Further, even if the current value is increased, the voltage does not increase, so that abnormal heat generation at the terminal portion can be suppressed. Therefore, it is possible to manufacture an electrolytic device that is easy to process and has a long life.
[0015]
A cylindrical anode and cathode are alternately combined concentrically (20), placed in a container (15) so that the portion is vertical, and an aqueous solution containing halogen ions is supplied between the electrodes. When the electrolysis is performed so as to obtain a residual halogen concentration of 1, an intercalation reaction portion (10) undergoes an electrolysis reaction, mainly generating hypohalous acid and active oxygen, and generating hydrogen as a by-product from the electrode surface. Oxygen is generated and rises violently. As a result of the rising of the bubbles, so-called air lift, an aqueous solution containing halogen ions is naturally sucked from the inlet (8) under the electrolyzer, and an electrolytic reaction is performed in the interelectrode reaction section. It is sent to the outside from the outlet (9) of the container.
[0016]
When water containing halogen ions is put in the container (16) and the above-mentioned electrolysis device is immersed in the terminal cover (15) so that it is on the water surface, electrolysis is performed. The aqueous solution containing halogen ions is naturally sucked from the inlet (8) under the electrolyzer by the air lift from the inlet (8) of the sterilization, and the sterilized washing water generated by the electrolytic reaction in the interelectrode reaction section is Since it is sent to the outside from the outlet (9) of the container, the correction is repeated, and the residual halogen concentration in the container gradually increases, so the residual halogen concentration sensor (21) sets the residual halogen concentration of water in the container. It is always desired because it has an automatic control mechanism that controls the electrolysis and removes the generated sterilized washing water and replenishes an aqueous solution containing halogen ions so that the concentration is adjusted. It is possible to make the sterilizing and washing water of distillate halogen concentration.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings.
Example 1 In FIG. 1, the anode (1) is a nickel ferrite round tube (effective length 280 mm, outer diameter 28 mm, electrode area 2.6 dm ² , the cathode (2) is a titanium round tube (effective length 280 mm). The inner diameter is 36 mm and the electrode area is 2.6 dm ² ), and the terminals (3, 4) are also used as set bolts for fixing the electrode tube to the electrode fixing part (14). Both the anode terminal and the cathode terminal are tubes. One tube is held down at both ends, a total of 4 locations at the top and bottom.
[0018]
In this example, a nickel ferrite round tube is used for the anode (1) and a titanium round tube is used for the cathode (2). However, in the case of a small capacity and a small current (5 Amp or less), the anode is platinum-plated titanium and the cathode. Ordinary combinations of titanium may be used, and in the case where a plurality of cylindrical anodes (1) and cathodes (2) are alternately arranged in a concentric circle with a distance between the poles, the apparatus is used rather than using nickel ferrite. Is easy to assemble.
[0019]
In FIG. 1, water containing halogen ions is injected from the inlet (8) into the interelectrode reaction section, undergoes electrolysis, is supplied as sterilized washing water to the outside from the outlet (9), and the addition of an aqueous electrolyte solution If the unit and the control unit are attached, it can be a small and simple sterilized washing water generator, and can be arranged horizontally or vertically, so that it can be used directly in a narrow place directly connected to a tap.
[0020]
When the electrical conductivity of the nickel ferrite round tube as the anode (1) is examined, as shown in FIG. 5 and Table 1, at 5 Amp., The resistance value between the two longitudinal points of the nickel ferrite is 8.3Ω, 200 mm at 100 mm. It is 12.0Ω at 300mm and 16.0Ω at 300mm. As shown in FIG. 1, a current of 10 Ω was able to be applied at 5 Amp. 300 mm by attaching 8 terminals along the circumference near the both ends of the nickel ferrite electrode by attaching 8 terminals with a total of 8 fixing screws.
[0021]
(Example 2) In FIG. 2, the anode (1) is a nickel ferrite cylinder having an outer diameter of 28 mm, a thickness of 8 mm, and a length of 280 mm, and the outer cathode (2) has an outer diameter of 42 with a distance of 4 mm between the electrodes. SUS316L pipe with a thickness of 7 mm, a thickness of 3 mm, an electrode part length of 280 mm, and a total length of 325.1 mm, and an electrode fixing part 1 (13) made of a non-conductive material at the bottom of the electrode fixing part 1 (13). There is an inlet (8) for supplying to the reaction part (10), and the uppermost electrode fixing part 2 (14) has an electrolytic sterilization washing water outlet (9).
[0022]
In this embodiment, a sintered ferrite tube after extrusion molding to the anode (1) is used, and a soft conductive low melting point metal joint (6) is inserted in advance into the tube, The terminal body (5) to which the anode terminal (3) is attached is pushed into and fixed. As the low melting point metal, lead (mp 327 ° C), wood alloy (mp 73 ° C, Bi50, Pb25, Sn13, Cd12) and mercury (liquid at room temperature) were used. ^-6 Ω · cm, wood alloy 31.3 × 10 ⁻⁶ Ω · cm, mercury 98.4 × 10 ⁻⁶ Ω · cm, but nickel ferrite was very high at 0.25 Ω · cm. It was.
[0023]
SUS304 terminal body with pre-heated lead and wood alloy with a 1mm-thick thin plate inserted to be attached inside the nickel ferrite tube, and the nickel ferrite tube is softened by heating it to near the melting point (5) was slowly inserted and fixed. The electrical resistivity of SUS304 was 72 × 10 ⁻⁶ Ω · cm.
In the case of lead as well as wood alloy, if the terminal is threaded, the terminal body (5) with sufficient adhesion could be inserted and bonded without heating, but better results were obtained when heated. It was.
[0024]
Since mercury is a liquid at room temperature, 15 ml of mercury is put in advance in the ferrite long hole (7) sealed at the bottom with the electrode fixing part 1 (13) and 0 ring (12), and the anode terminal (3) When the attached terminal body (5) is gently inserted, mercury penetrates sufficiently into the gap between the terminal body and the ferrite, and the excess part comes out, but the O-ring of the electrode fixing part 2 (14) (12) This mercury is stored in a space at the upper end of the terminal body. The upper part of the anode was sealed with the electrode fixing part 2 (14) and an O-ring, and the energization resistance to the anode was measured in the same manner as in Example 1.
[0025]
As shown in FIG. 3, (2) is a conductive, low melting metal lead, wood alloy and mercury sandwiched between the nickel ferrite anode (1) and the terminal body (5), respectively, as shown in FIG. Two points on the surface of the nickel ferrite anode (1) and the power supply unit are connected by electric wires, and one end is fixed, and the other one is changed in position so that a conducting distance of 100 to 300 mm can be obtained. The resistance value was measured.
[0026]
In Table 1, since the electrical resistance of ferrite alone is large, the energization resistance increases as the energization distance becomes longer, and electrolysis becomes difficult. When lead, wood alloy, or mercury is used, the resistance is greatly reduced and the influence of the energization distance is reduced. In addition, when the terminal body is inserted after heating near the melting point, the result is even better. Since mercury is a liquid, it penetrates into a narrow gap without heating, and the best results were obtained in these tests.
When an SUS316L pipe is attached to the outside as a cathode (2) with a distance of 4 mm between the electrodes, and the anode and the cathode are fixed by the electrode fixing portion 2 (14), the electrolytic device main body is completed.
[0028]
(Embodiment 3) FIG. 4 shows an embodiment of an apparatus for producing sterilized washing water having a high residual chlorine concentration using the electrolyzer assembled in Example 2, in the sterilized washing water container (16). Four sets of electrolyzers are installed, and a 2.5% saline solution (electric conductivity 49,000 μS / cm) is added as halogen-containing water to a predetermined WL (set water level) (24) of 16 liters and 15 Amps Electrolysis was performed at. Current, voltage, and residual chlorine concentration were measured every 15 minutes, and the results are shown in Table 2 and FIG.
[0029]
The present embodiment was carried out for the purpose of generating 16 liters of sterilized washing water having a high residual chlorine concentration in a short time in order to sterilize medical equipment, hospital sheets, etc., and has an anode area of 2.6 dm ² . As a result of operating only one set of electrolyzer and simultaneously operating four sets, 630 p. p. m. In 4 sets, 2510p. p. m. Met.
[0030]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
[0031]
(A) According to the invention of claim 1, the electrodes are cylindrical, the anodes and the cathodes are alternately stacked on the same axis, are small, compact and durable, and are made of a commonly used vinyl chloride resin. The case is cylindrical and can be made durable with a simple structure, and even if it is used for a long time, there is no leakage from the electrolyzer. As shown in FIG. 2, if all the terminals are attached to the upper end and the electrolyzer is fixed so that the terminal cover (5) is on the surface of the water, it can be placed directly in the target water container without being housed in a sturdy case. The heat generated in the electrode is absorbed and cooled by the water in the container. On the other hand, the water in the container is automatically circulated even without a pump without being pumped by being sucked, electrolyzed and discharged by the air lift generated by the foaming and rising of the gas generated in the interelectrode reaction section (10). It can be electrolyzed to increase the residual chlorine concentration.
(E) When a plurality of cylindrical anodes are used coaxially, the anode (1) at the center can be connected to the terminal, but the nickel ferrite anode on the outer side cannot be formed in the same manner as that. Two different nickel ferrite anodes are stacked, a cylindrical conductive metal terminal body (5) is inserted between them, and the nickel ferrite anode and the terminal body are joined together with a conductive low melting point metal or mercury. The cylindrical anode is constructed, and cylindrical cathodes are arranged on the inside and outside thereof with an inter-electrode distance of 0.5 to 5.0 mm. By configuring the anode in this way, not only can terminal bonding be reliably performed in a wider area, but also this anode can be used on both sides.
[0032]
(B) According to the invention of claim 2, since the conductivity could be improved by contacting and bonding the terminal body (5) and the low melting point metal joint (6) over a wide area of nickel ferrite, the corrosion resistance Although it has a high resistivity, it has a specific resistance of 0.25 Ω · cm, which is usually much higher than the order of 10 ⁻⁶ Ω · cm for copper, platinum, lead, etc., which are used for electrodes. The defect of nickel ferrite was overcome. In addition, the melting point of the low melting point alloy can be arbitrarily selected depending on the composition. The wood alloy is usually solid at 73 ° C. However, if a gap is formed with the ferrite and the voltage increases, the part generates heat and the alloy It melts and fills the gap, lowering the electrical resistance, and has the effect of continuing normal electrolysis.
[0033]
(C) According to the invention of claim 3, a low melting point metal tube (6) is inserted in advance into a long hole (7) drilled in the central axis direction of a ferrite round bar or a ferrite pipe. In addition, by screwing a conductive metal bar terminal body (5) threaded on the outer periphery, a soft low melting point metal fills the gap between the terminal body and the ferrite to improve the coupling.
[0034]
(D) According to the invention of claim 4, the conductive low melting point metal that has been heated to become liquid, or mercury that is already in the liquid penetrates into the gap between the terminal body and the nickel ferrite, and then changes from the terminal body to the nickel ferrite. The conductivity of the is further improved.
[0035]
(E) According to the invention of claim 5, when a plurality of cylindrical anodes are used coaxially, the anode (1) at the center can be connected to the terminal by the invention of claim 1, but the nickel which is outside it Since ferrite anodes cannot be made in the same way, two nickel ferrite anodes with different diameters are stacked, and a cylindrical conductive metal terminal body (5) is inserted between them to form a conductive low melting point metal. Alternatively, a cylindrical anode is formed by combining the nickel ferrite anode and the terminal body with mercury, and a cylindrical cathode is arranged inside and outside with a distance of 0.5 to 5.0 mm between each. To do. By configuring the anode in this way, not only can terminal bonding be reliably performed in a wider area, but also this anode can be used on both sides.
[0036]
(F) According to the invention of claim 5, a ferrite round bar or round tube can be manufactured by extruding, and a length of 30 cm or more and over 1 m can be manufactured. By this invention, the length of the terminal body is increased. It is possible to produce a long and large electrode, and if this is used vertically, an electrolyzer with a very small installation area can be designed, which is useful as a sterilization washing water generator for hospital intensive care units. is there.
In addition, when a plurality of cylindrical anodes are used coaxially, the anode (1) at the center can be connected to the terminal, but the nickel ferrite anode outside the same can not be formed in the same way, so the diameters are different. Two nickel ferrite anodes are stacked, a cylindrical conductive metal terminal body (5) is inserted between them, and the nickel ferrite anode and the terminal body are joined and integrated with a conductive low melting point metal or mercury. A cylindrical anode is formed, and cylindrical cathodes are arranged on the inner and outer sides with a distance of 0.5 to 5.0 mm between the electrodes. By configuring the anode in this way, not only can terminal bonding be reliably performed in a wider area, but also this anode can be used on both sides.
[0037]
(G) According to the invention of claim 6, the long ferrite electrode as described in the previous section is further effective because a good conductive connection between the terminal body and the long ferrite electrode is required.
[0038]
(H) According to the invention of claim 7, since the electrolysis apparatus can be directly installed in the sterilization washing water container (16), there is no extra piping, and it can be installed in a narrow space. -Using a lift, the water in the sterilization / cleaning water container (16) can be circulated between the container and the electrolyzer without a pump, repeatedly subjected to electrolytic treatment, and the residual halogen concentration can be efficiently increased. In this case, water containing halogen ions is supplied not only with tap water and well water, but also with bath water, pool water, fish tank water, sewage combined treatment water with appropriate addition of halogen ions, It can be purified and sterilized.
[0039]
(I) According to the invention of claim 8, since the residual halogen concentration is measured by the residual halogen concentration sensor (21) and the electrolysis is controlled by the control device, the sterilized washing water having a constant concentration is always medically used. It can be used safely for sterilization cleaning of tools and prevention of hospital infection.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an electrolysis apparatus composed of a cylindrical anode and a cathode.
FIG. 2 is a cross-sectional view showing a state where a terminal body and a low-melting-point metal joint are inserted inside the anode of an electrolysis apparatus composed of a cylindrical anode and a cathode.
FIG. 3 is a diagram showing an experimental method for investigating how the energization voltage changes depending on the position of the nickel ferrite anode and the terminal and how they are coupled in Example 1;
(1) A current of 5 Amp. Is applied between two points on the surface of the nickel ferrite anode cylinder, and the voltage is measured.
(2) A low melting point metal joint (6) and a terminal body (5) are mounted inside the nickel ferrite anode cylinder, and a current of 5 Amp. Is applied between two points on the cylinder surface to measure the voltage.
(3) First, 15 ml of mercury is put inside the nickel ferrite anode cylinder, then the terminal body (5) is mounted, and a current of 5 Amp. Is applied between two points on the cylinder surface to measure the voltage.
4 is a cross-sectional view of a sterilizing / cleaning water generating apparatus in which four sets of the electrolysis apparatus shown in FIG. 2 are mounted in a sterilizing / cleaning water container (16). FIG.
5 is a plan view seen from above of the sterilizing / cleaning water generating apparatus shown in FIG. 4. FIG.
FIG. 6 is a graph showing the measurement results of the electrolysis time and residual halogen concentration of 1 set of 2.6 dm ² electrolyzer and 4 sets of sterilized washing water generator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Anode 2 Cathode 3 Anode terminal 4 Cathode terminal 5 Terminal body 6 Low melting point metal joint part 7 Ferrite long hole 8 Entrance of aqueous solution containing halogen ion 9 Electrolytic sterilization washing water outlet 10 Interelectrode reaction part 11 Seal part 12 0 ring 13 Electrode fixing part 1
14 Electrode fixing part 2
15 Terminal cover 16 Electrolytic sterilization washing water container 17 Lid 18 Bottom 19 Supply port 20 of aqueous solution containing halogen ions Electrolytic sterilization washing water outlet 21 Residual halogen concentration sensor 22 Electrolytic device 23 Electrolytic device fixing part 24 Sterilization washing water level (WL)
25 Test terminal (+)
26 Test terminal (-)
[Table 1]
Nickel ferrite electrode energization 5 Amp. Voltage V

Claims (8)

By alternately arranging a plurality of cylindrical anodes (1) and cathodes (2), concentrically spaced apart from each other, and electrolyzing an aqueous solution containing halogen ions between the electrodes When producing a sterilizing washing water containing a large amount of hypohalous acid and active oxygen, and using a ferrite pipe as the cylindrical anode, two ferrite pipes having different outer diameters of 1 to 5 mm, and A conductive metal pipe with an intermediate diameter of about 1 to 2 mm is inserted as a terminal body (5), stacked coaxially, and infused with a low melting point metal or mercury that is heated and dissolved in the gap between them. An electrolysis method characterized in that is used as an anode . The central anode (1) is a ferrite round bar or a ferrite pipe having a long hole in the center axis direction, and a conductive metal bar slightly smaller than the hole diameter is inserted as a terminal body (5), A soft conductive low melting point metal joint (6) is sandwiched between the outer periphery of the metal bar terminal body and the hole, and a conductive corrosion-resistant metal tube is placed outside the long bar-shaped anode as a cathode (2). The electrolysis method according to claim 1, wherein the electrolysis methods are arranged concentrically. Insert a long cylindrical soft conductive low melting point metal joint (6) into a long hole (7) drilled in the direction of the central axis of a round bar of ferrite, or a ferrite pipe, The electrolysis method according to claim 2, wherein a conductive rod-shaped terminal body (5) threaded on the outer periphery is screwed into an anode. When screwing the conductive terminal body (5), or low melting point metal bonding portion of the conductive advance inserts (6) are heated enough fluidity leaves, used mercury is liquid at normal temperature according Item 4. The electrolytic method according to Item 3 . A cylindrical anode (1) and a cathode (2) are arranged concentrically with a distance between the poles and stacked, and the anode (1) at the center is a ferrite having a long hole (7) in the central axis direction. A round bar or round tube, in which a long cylindrical soft conductive low melting point metal joint (6) is inserted in advance, and a conductive rod-shaped terminal having a threaded outer periphery The main body (5) is screwed as an anode, and a corrosion-resistant metal tube is arranged concentrically as the cathode (2) on the outside, and an aqueous solution containing halogen ions is fed between the electrodes to perform electrolysis to produce sterilized washing water. Thus, when a ferrite pipe is used as the cylindrical anode, two ferrite pipes having different outer diameters of 1 to 5 mm and a conductive metal pipe having an intermediate diameter of about 1 to 2 mm in thickness are used. Insert as the terminal body (5), coaxial I, electrolyzer, characterized in that the low-melting metal or mercury dissolved by heating in a gap between them that were injected infiltrated was used as the anode. 6. The electrolysis apparatus according to claim 5, wherein when the conductive terminal body (5) is inserted, the conductive low-melting-point metal is heated to such an extent that fluidity is obtained, or mercury which is liquid at room temperature is used. Alternately said cylindrical anode (1) and the cathode (2) respectively one or a combination concentrically, placed in the electrolytic sterilizing the washing water container so as to be perpendicular (15), halogen ions to the machining gap 7. An electrolyzer according to claim 5 or 6, wherein an aqueous solution containing water is supplied, electrolysis is performed so as to obtain a predetermined halogen concentration, and the produced sterilized washing water is taken out of the container. The residual halogen concentration of water in the electrolytic sterilization washing water container (16) is controlled by measuring the residual halogen concentration of water in the electrolytic sterilization washing water container (16) by the residual halogen concentration sensor (21). Until the concentration reaches a set concentration, the water in the container is sucked from the inlet (8) of the aqueous solution containing halogen ions into the interelectrode reaction part (10) by the air lift by gas generated by electrolysis, and electrolyzed. As a sterilization washing water rich in hypochlorous acid and active oxygen of higher concentration by the reaction, it is returned from the electrolytic sterilization washing water outlet (9) to the electrolytic sterilization washing water container (16) until the set residual halogen concentration is reached. An automatic controller that repeats this circulation, takes out the sterilized washing water that has reached the set residual halogen concentration, supplies it for use, and replenishes an aqueous solution containing new halogen ions Electrolysis apparatus according to any one of claims 5 to 7 and a.

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