JPH1150278A - Electrode for electrical rust prevention of piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the electrodes for electrical rust prevention of piping to be mounted on metallic piping for the services of tap water, water feeding, hot water feeding, underground water and springs in order to prevent generation of rust. SOLUTION: In electrodes 10 for electrical rust prevention of piping, a copper- niobium alloy slender electrode terminal 12 is arranged in a center circular hole in a disk-shaped electrode holder 11 in an exposed manner. The holder 11 is formed of electrically insulating resin, and a connecting terminal 16 for wiring and a bolt hole 13 are formed therein. The electrode is mounted between flanges of the piping connection part, and the weak DC current (of several mA to tens of mA) flows from the electrode terminal 12 through water in the piping. Electrons are supplied to the pipes, and ionization of the metal is prevented to suppress generation and progress of the rust. The weak current can be easily supplied by converting the current from a general AC power source into the necessary weak current by a current controller and a limiter provided on the electrode, and is of the current value completely negligible in practice, and does not adversely affect the human body during work or in a practical life.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic rust prevention electrode for piping, and more particularly to a piping and rust prevention electrode suitable for protecting piping and equipment used for water supply, hot water supply, groundwater, etc. from rusting. Electrodes.

[0002]

2. Description of the Related Art In general, the mechanism of rusting of water pipes and the like is based on an electrochemical reaction, and electrons contained in the metal of the pipe are deprived by an electrolyte such as water, so that the metal is eroded. The ionized and deprived electrons combine with oxygen in water to form hydroxide ions OH ~, which react with metal ions to form rust. In particular, the oxygen dissolved in the water accelerates these phenomena, turning corners where the flow changes,
Rust often occurs at the connection part of the parts.

[0003] Incidentally, rust and corrosion of piping appear as follows. For example, aging water supply piping first manifests itself in water quality and changes in water color, smell, taste, and the like. When rust is generated in the pipe, 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 rusting 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 such piping, but all have problems as described below. In the case of piping, it is difficult to apply rust-proof coating on the inner wall of the pipe, and there is a hygienic problem in water supply and the like.

[0010]

The conventional pipe rust prevention method has the following problems. (1) The chemical mixing method is a method in which a chemical is injected into water to form a film on the inner wall of the pipe to prevent rust by preventing contact between water and metal, but the cost is increased because the chemical is used every few months. high,
In addition, it is necessary to pay attention to the effect of the drug on the human body or the effect of the drug on piping and instruments. (2) In the lining method, sand particles are sprayed into the pipe,
After removing the deposits, a film is formed on the inner wall of the pipe to prevent rust by preventing contact between water and metal.However, since it can not be processed into threaded parts or pumps, rust and
It is not decisive because water leakage occurs due to the progress of rust. (3) The degassing method is a method of reducing oxygen dissolved in water and suppressing oxidization reaction to prevent rust. However, since the motor is rotated, electricity costs and maintenance costs are required, and the cost is high.

An object of the present invention is to stop red water such as tap water, and to install metal rust prevention on metal piping or equipment used for water supply, hot water supply, groundwater, etc. in order to prevent rust. To provide an electrode for use.

[0012]

The above-mentioned object is attained as follows. According to the first aspect of the present invention, a weak DC current is applied to an insulating holder attached to a metal pipe and an electrolytic solution such as water or hot water held by the holder and flowing through the pipe. And a terminal. Therefore, if the pipe is grounded, electrons are replenished to the pipe metal, so that ionization of the metal is prevented and generation and progress of rust are suppressed. Further, the invention according to claim 2 is characterized in that the holding body is formed of an annular plate body, is sandwiched between flanges of the connecting portion of the pipe, and a hole having a diameter equal to or larger than a flow diameter in the pipe is formed. In the hole, the terminal consisting of a thin wire made of copper-niobium alloy coated with platinum is provided, so the electrode installation work can be done easily and reliably, and a weak current can be applied without adversely affecting the flowing water etc. it can.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an electrode for a water supply pipe according to an embodiment of the present invention, wherein (a) is a front view and (b) is a side view. 1 and 2 are different from each other in the inner diameter of the pipe, and the one shown in FIG. 1 is used for a large diameter and a large scale, and the one shown in FIG. 2 is used for a relatively small diameter and a small scale. As shown in these figures, the electrode 10 for electronic rust prevention of piping of the present embodiment has a thin electrode terminal 12 made of a copper-niobium alloy exposed in a circular hole at the center of a disk-shaped electrode holder 11. Wired. The electrode holder 11 is an insulative resin molded product, provided with connection terminals 16 for wiring connecting the electrode terminals 12 and the current controller, and formed with bolt holes 13 for tightening.

In the present embodiment, a detachable screw-in type current limiter 14 is attached to the electrode 10.
In order to prevent an excessive current from flowing to the electrodes, the current from the current controller is made a weaker current. The upper limit of the current of the limiter is set according to the pipe diameter. Current limiter 1
4 is provided with a light-emitting diode energization indicating lamp 15, thereby. Energization can be checked at the electrode mounting location. Note that a special resin is poured into the case in which the limiter 14 is stored to protect the internal components. Further, brass is used for the limiter mounting portion in order to improve conductivity.

The electrode holder 11 is formed by molding a special resin which is harmless to sanitation since the piping is for water supply.
In addition, the material to be used is selected in consideration of workability at the time of manufacture, weight reduction of the product, sealing property at the time of pipe installation, and the like. In this embodiment, a resin such as a polypropylene resin or a vinyl chloride resin can be used.

As shown in FIGS. 1 and 2, the number, shape and arrangement of the fine wires of the electrode terminals 12 are increased or decreased depending on the pipe diameter. The fine wire is made of an alloy of copper and niobium and is coated with platinum to prevent terminal wear. The connection between the holding body 11 and the electrode terminal 12 is sealed with a band made of a special resin for the purpose of preventing water leakage and improving the pressure resistance. The number and arrangement of the thin wires of the electrode terminal 12, the number and arrangement of the bolt holes 13, the thickness of the electrode holder 11, and the like are appropriately designed according to the scale. Further, the materials of the electrode holder 11 and the electrode terminals 12 are not limited to those described above, and can be selected as needed.

FIG. 3 and FIG. 4 are views showing an example in which the pipe electronic rust prevention electrode of this embodiment is attached to a water supply pipe.
FIG. 3 is a perspective view, and FIG. 4 is an enlarged view of an electrode mounting portion. As shown in FIG. 3, the disk-shaped electrode holder 11 is sandwiched between the flanges 21 of the connection part of the metal pipe 20, the bolt 22 is tightened and attached, and the electrode wiring 23 is mounted.
Are connected to the current controller 24. General AC power supply 2
The AC current from 5 is adjusted to a weak DC current (25 mA to 350 mA in this embodiment) by the current controller 24, and further reduced to a weak current (8 mA to 26 mA in this embodiment) by the electrode limiter. It is lowered and energized into the water. Further, connection lines 26 for a plurality of electrodes are provided in the current controller 24 as necessary. According to the scale of the piping equipment, a set including a current controller and a plurality of electrodes can be arranged at a plurality of locations.
In this example, the ground 27 is also connected to the current controller 24.

As shown in FIG. 4, a water passage hole having the same diameter as the inside diameter of the pipe is formed in the center of the electrode holder 11, and the water passage hole is made of an electrode terminal made of a copper-niobium alloy coated with platinum. 12 is exposed and wired so as to be in contact with flowing water, so that a weak current 28 is supplied through water in the pipe.

The method of mounting the electrode 10 is not limited to the above-described example of the method of sandwiching the flange of the pipe connection portion. For example, the existing pipe may be cut, a thread may be cut on the inner wall of the pipe, and the pipe may be fixed by screwing. Alternatively, a hole may be formed in the pipe wall, and the electrode may be protruded from the hole into the inside of the pipe and fixed.
In short, it is only necessary that the electrode is in contact with water and that the electrical insulation between the electrode and surrounding members and the watertightness of the electrode mounting portion be considered.

As described above, according to the electrode of the present embodiment, a weak current flows from the electrode terminal to the pipe via the water. When current flows, electrons move in the opposite direction, so electrons are supplied to the pipe from the ground. Rust is generated by the reaction of hydroxide ions, which are generated when metal electrons are deprived by water, and the ionized metal, which is deprived of electrons. Ionization is prevented, thereby suppressing the occurrence and progress of rust. The weak current is easily supplied by converting a current from a general AC power supply into a necessary weak current by a current controller and a limiter. In the electrode shown in FIG. 1, the current is at most several tens of mA, and in the electrode shown in FIG. Therefore, in reality, the current value is completely negligible, and has no adverse effect on the human body in work and in real life.

[0021]

As described above, according to the present invention, red water such as tap water can be easily attached to metal pipes, and rust can be prevented from being generated in water supply, hot water supply, groundwater, or hot spring facility pipes. In addition, the life of the piping equipment can be extended.

[Brief description of the drawings]

FIG. 1 shows an electrode applied to a pipe having a relatively large diameter according to an embodiment of the present invention, (a) is a front view, (b)
Is a side view.

FIG. 2 shows an electrode applied to a pipe having a relatively small diameter in one embodiment of the present invention, wherein (a) is a front view and (b)
Is a side view.

FIG. 3 is a configuration diagram illustrating an example in which the present embodiment is applied to a water supply pipe.

FIG. 4 is an enlarged view of a connecting portion of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Electrode for piping electronic rust prevention 11 Electrode holder 12 Electrode terminal 13 Bolt hole 14 Current limiter 15 Current indicator lamp 16 Connection terminal 20 Piping 21 Flange 22 Bolt 23 Electrode wiring 24 Current controller 25 General-purpose AC power supply 26 Connection line 27 Earth 28 Weak current

Claims (2)

[Claims] 1. A holding member attached to a metal pipe, and a terminal held by the holding member and supplying a weak DC current to an electrolyte such as water or hot water flowing through the pipe. An electrode for electronic rust prevention in piping. 2. The holding body is formed of an annular plate, and is sandwiched between flanges of connection portions of the pipe, and a hole having a diameter equal to or larger than a flow diameter in the pipe is formed. 2. The electrode for electronic corrosion prevention of piping according to claim 1, wherein said terminal comprising a fine wire formed by applying a platinum coating to a copper-niobium alloy is provided.