JPH1161462A - Electronic rust preventive electrode for tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic rust preventive electrode which is stably installed without short circuit to suppress generation of rust on an inner wall of a tank by a method wherein a weak current flows in the electrolyte liquid in a metallic water storage tank. SOLUTION: In an electronic rust preventive electrode 11 for a metallic water storage tank, a platinum coating is executed on an electrode terminal 12 of a copper-niobium alloy, and a resin plug 13 is mounted on a tip thereof. In addition, an electrically insulated network 14 covers over the whole terminal to prevent the terminal 12 from being abutted on a metallic part and electrically sort-circuited. A float 15 is mounted, if necessary, so that the float is afloat in the water level to follow the change in the water level. The weak current flows in water in the tank, thus the electron is supplemented to suppress ionization of the metal and generation of the rust.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic rust preventive electrode for a tank, and more particularly to an electronic rust preventive electrode for a tank suitable for protecting an inner wall of a metal tank for storing an electrolyte such as water from rust. Electrodes.

[0002]

2. Description of the Related Art Generally, the mechanism of rusting of a metal part such as a water storage tank is based on an electrochemical reaction. When a metal comes into contact with an electrolyte such as water, electrons contained in the metal are converted into an electrolyte. The metal that has been deprived of electrons is ionized. The deprived electrons combine with oxygen in the electrolytic solution to generate hydroxide ions OH ~, and the hydroxide ions react with metal ions to generate rust. In particular, oxygen dissolved in water accelerates these phenomena, and a lot of rust is generated at a connection portion of a part.

By the way, rust and corrosion of a metal tank appear as follows. For example, aging of a water storage tank first appears in water quality, and changes in water color, smell, taste, and the like. When rust occurs in the tank, the water becomes red and cloudy, and the taste becomes astringent.
In hot water supply facilities, bath water appears red, laundry becomes dirty, and lavatory water appears dirty. In underground water and hot springs, phenomena such as a decrease in water volume, changes in water quality, and water contamination occur.

Hereinafter, the mechanism of rust generation will be described electrochemically using iron as an example. Metals, such as iron, carry electrons. When water and oxygen are present, the electrons of the metal are deprived and become hydroxyl ions. The iron ions that have lost the electrons and the hydroxide ions combine to form ferrous hydroxide. When water and oxygen are further supplied to ferrous hydroxide, it becomes ferric hydroxide. This is the so-called red rust. The above-mentioned mechanisms are represented by the following chemical formulas.

[0005]

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[0006]

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[0007]

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[0008]

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Further, if there is a foreign metal having a noble potential in contact with water, electrons of a metal having a low potential are robbed by the noble metal having a noble potential and are dissolved in the electrolytic solution. By the reaction of 3 or less, corrosion of a metal having a low potential proceeds. There are several methods for suppressing the occurrence of rust in the tank, but all have problems as described below. The anticorrosive coating of the tank inner wall has a hygienic problem in the case of water supply and the like.

[0010]

For example, the rust prevention method for a water storage tank has the following problems. The chemical mixing method is a method of injecting a chemical into water to form a film on the inner wall of the tank and preventing rust by preventing contact between water and metal.However, since the chemical is used every few months, the cost is high,
In addition, it is necessary to pay attention to the effect of the medicine on the human body or the effect of the medicine on the tank. The lining method is a method of spraying sand particles etc. on the tank inner wall, removing deposits, forming a film on the inner wall, preventing contact between water and metal, and preventing rust, but it takes time and effort,
Also, since it cannot be processed into threaded parts or pumps,
It is not definitive because water leaks from these places due to rust and rust progression. The deaeration method is a method of reducing oxygen dissolved in water and suppressing oxidization reaction to prevent rust. However, since the motor is rotated, electricity cost and maintenance cost are required, and the cost is high.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic protection system for a tank which is stably installed in order to suppress a rust on an inner wall of the metal tank by applying a weak current to an electrolyte in a metal tank such as a water storage tank. It is to provide a rust electrode.

[0012]

The above-mentioned object is attained as follows. The electronic rust preventive electrode for a tank according to the first aspect of the present invention has a terminal that is always in contact with the electrolytic solution in the metal tank and that supplies a weak DC current to the metal tank through the electrolytic solution. It is characterized by. Therefore, by providing a ground to the tank, a circuit of a weak current is formed in the metal part of the tank via the electrolytic solution, and electrons are replenished to the metal part of the tank. Thereby, ionization of metal is prevented, and generation and progress of rust are suppressed. In addition, the invention according to claim 2 is characterized in that the terminal is exposed to the electrolytic solution and is provided with protection means for preventing an electric short circuit due to contact with a metal, so that a weak current can be sufficiently supplied to the electrolytic solution. Electricity can be supplied, and the exposed terminal does not abut against the metal part of the tank or the like, and does not short-circuit electrically.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of an electronic rust prevention electrode for a tank according to the present invention. As shown in the figure, the electronic rust-preventive electrode 11 for the metal water storage tank 10 (FIG. 2) is provided with an electrode terminal 12 formed by coating a platinum coating on a niobium-copper alloy. In order to prevent this, a plug 13 made of resin is mounted. Further, an insulating net 14 is placed over the entire terminal to prevent the terminal 12 from abutting against the metal portion of the tank inner wall to short-circuit electrically. If necessary, float 15
Is mounted so that it can float below the water surface, so that it can follow the water level in the tank even if it rises or falls. Thus, the weak current supplied from the wiring 16 is supplied to the metal inner wall of the tank through the water.

FIG. 2 is a view showing an installation state of an electronic rust prevention electrode according to the present invention in a water storage tank. As shown in the figure,
The wiring 16 of the electrode 11 is connected to a current controller 17, and the current controller 17 is connected to an AC power supply 18. Although only one electrode 11 is shown in the figure, any number of electrodes 11 can be provided as needed. In this figure, a spiral tube made of an insulator is covered as a protective device for the electrode terminal. An earth 19 is installed in the tank.

FIGS. 3 and 4 are a longitudinal sectional view and a transverse sectional view of a water storage tank to which one embodiment of the present invention is mounted.
The water storage tank 10 made of a steel plate stores drinking water. The steel plate 20 on the inner wall of the tank is constantly exposed to water 21 which is an electrolytic solution, so that rust is easily generated. Also, the water level in the tank moves up and down due to the distribution of water and the replenishment of water to the tank, and is not constant. Therefore, the electrodes 22 for applying a weak current to the water in the tank are also arranged at the bottom of the tank so as to always contact the increasing or decreasing water, and an arbitrary number of the electrodes 22 are provided in the vertical direction according to the depth of the tank. doing.

The electrode 22 has a terminal exposed so that it can come into contact with water, and is attached to an insulating resin pipe 23. In the pipe, a connection wire 24 coated with insulation for each electrode is provided. In addition, the resin pipe 23 is used to prevent the electrode 22 from contacting the steel plate 20 on the inner wall of the tank and electrically short-circuiting.
Are mounted away from the inner wall of the tank by a support 25. In FIG. 4, the resin pipes 23 are provided at three positions according to the diameter of the tank 10. These resin pipes 2
In this example, the connection line 24 for each electrode drawn out from inside 3 is connected to one current controller 17, and twelve electrodes are arranged in one current controller. The current controller 17 is connected to an AC power supply 18 via a timer 26. The steel plate 20 of the tank is grounded 19 and connected to the current controller 17.

When the timer 26 operates, the AC power supply 18
Is adjusted to a weak DC current by the current controller 17 and sent to each electrode 22, and the current is supplied from the electrode terminal in contact with water to the water. The weak current that has been supplied to the water flows through the steel plate 20 having the ground 19, and as a result, electrons are supplied to the steel plate 20. for that reason,
Since generation of iron ions from the steel sheet 20 is suppressed, generation and progress of rust are suppressed. In this example, a timer is provided to control ON / OFF of the current supply. However, it is needless to say that the timer may be omitted and a weak current may be constantly supplied.

As a power source, a general AC, AC100
V, AC200V, AC220V, etc. can be used. The weak current supplied from the current controller to the electrode is at most about 350 mA, and the limiter attached to the electrode or the like turns the current into an extremely weak current of several to several tens mA, and supplies the current to the water. Therefore, in reality, the current value is completely negligible, and has no adverse effect on the human body in work and in real life. Further, the range that can be covered by one electrode cannot be unconditionally determined depending on the situation, but in the case of the above-described embodiment, it is approximately 9 to 15 m ² . Of course, it is possible to cover a wider range depending on the surrounding environmental conditions and the supplied current value.

[0019]

As described above, according to the present invention, rusting on the inner wall of a metal tank such as a water storage tank is suppressed, so that even if the amount of electrolyte such as water in the tank increases or decreases, it is stable without short-circuiting. And a weak current for rust prevention can be supplied.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an electronic rust prevention electrode for a tank according to the present invention.

FIG. 2 is a longitudinal sectional view showing an installed state of an electronic rust prevention electrode according to the present invention.

FIG. 3 is a longitudinal sectional view of a water storage tank to which one embodiment of the present invention is attached.

FIG. 4 is a cross-sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Metal water storage tank 11 Electronic rust prevention electrode 12 Electrode terminal 13 Resin plug 14 Reticulated body 15 Float 16 Wiring 17 Current controller 18 AC power supply 19 Earth 20 Steel plate 21 Water 22 Electronic rust prevention electrode 23 Resin pipe 24 Connection line 25 Support Tool 26 Timer

[Procedure amendment]

[Submission date] January 29, 1998

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[Procedure amendment]

[Submission date] March 27, 1998

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[0007]

Embedded image 2Fe ²⁺ + 4OH → 2Fe (OH)
₂ (iron ion + hydroxyl ion → ferrous hydroxide)

Claims (2)

[Claims] Claims: 1. A constant contact with an electrolytic solution in a metal tank,
An electronic rust prevention electrode for a tank, comprising: a terminal for supplying a weak DC current to the metal tank via the electrolyte. 2. The terminal is exposed in the electrolyte,
2. The electrode according to claim 1, further comprising protection means for preventing an electrical short circuit due to contact with a metal.