JPH0410218Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an electrode used for corrosion protection of a hot water storage tank such as an electric water heater whose inner surface is glass-lined using an external power source.

Configuration of the conventional example and its problems The conventional example will be explained based on the drawings. In Fig. 4, 21 indicates an electrode whose one end is sealed and fixed to a sealing material 22, and generally Pt is applied to the surface of the insoluble Ti wire.
A plated one is used. In addition, sealing material 2
2 is generally made of non-conductive fluororesin, etc.
Its outer periphery is hermetically fixed to the mounting plug 23, and it is mounted at an appropriate position in the hot water storage tank 24. Corrosion prevention of the pinhole part of the glass lining treatment on the inner surface of the hot water storage tank 24 and the heating element 25 is carried out using a DC anti-corrosion power supply 26.
Corrosion is prevented by applying a predetermined voltage using a device and passing an anticorrosion current. In this case, the anti-corrosion current will be applied to the area near the electrode 21 at the shortest distance, where the resistivity (Ω cm) of hot water is smaller, and therefore the anti-corrosion current from the electrode 21 will be applied to areas around the installation position or exposed metal surfaces. The flow is mainly concentrated in the heating element 25, and the hot water storage tank 2 is caused by a defect in the glass lining treatment at a distance.
Even if the fabric is exposed in step 4, it is difficult for the anti-corrosion current to flow.
There was a problem in that the anticorrosion effect was reduced by half as the distance from the mounting position of the electrode 21 increased. Therefore, it is difficult to select the mounting position of the electrode 21, and in order to maintain the same distance from all parts of the hot water storage tank 24, the electrode 21 must be hung in the center of the hot water storage tank 24, or the electrode 21 must be It is necessary to install a large number of them. In the former case, increasing the length of the electrode 21 increases the cost, and at the same time, the anticorrosion current concentrates around the attachment part of the hot water tank 24 at the base of the plug 23, and the original anticorrosion current does not flow from the tip of the electrode 21. Regarding the latter, it is expensive, and the anticorrosion current does not reach areas that are in the shadow of the heating element 25, for example, so the number of electrodes 21 increases.

Purpose of the invention In view of the above-mentioned problems, the present invention is an inexpensive and effective method in which each electrode is arbitrarily fixed to a conductive wire, and the conductive wire is coated with a coating that does not allow corrosion-preventing current to flow. The purpose is to provide something.

Structure of the invention The basic structure of the invention to achieve the above object is as follows: a plurality of electrodes, a conductive wire with the electrodes fixed at appropriate intervals in the middle, and a conductive wire connected to the conductive wire of the electrode. It consists of a non-conductive coating formed to cover the fixed part of the conductive wire, a sealing material and a mounting plug that hold one end of the conductive wire covered with this non-conductive coating, and is formed so as to apply an anti-corrosion current to the conductive wire. It is something. By having the above-mentioned structure, the present invention can apply the anti-corrosion effect evenly to each part in the hot water storage tank, and can solve the problem of the anti-corrosion effect being halved or not being effective.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings. In FIG. 1, reference numeral 1 indicates a conductive wire whose one end is hermetically fixed to the sealing material 2, and is made of Cu wire or the like. The outer periphery of the sealing material 2 is hermetically fixed to the mounting plug 3.
Reference numeral 4 indicates a plurality of electrodes, one end of which is fixed in the middle of the conductive wire 1 using a caulking tool, welding, adhesive, or other means. The electrode 4 is generally made of a non-dissolvable Ti wire whose surface is plated with Pt. Reference numeral 5 indicates a layer of a non-conductive coating formed by dipping, for example, polyamide resin, which is coated over the entire length of the conductive wire 1, and at this time, the portion to which the electrode 4 is fixed is also coated at the same time. Therefore, the main part of the electrode 4 which is not coated escapes upward and extends as shown in A, and is not immersed in the resin melt in the dip bath. After the coating 5 is formed, the electrode 4 is finished by bending it into a spiral coil shape around the conductive wire 1, for example, as shown in B.

2 and 3 show other embodiments, showing various shapes of the electrode 4 and various fixing parts.

Here, the non-conductive film 5 has hot water resistance and Cl ₂ resistance.
Materials are selected by considering gas properties, hygienic properties, pinhole formation properties, adhesion properties, etc. Moreover, the shape of the electrode 4,
If the method of fixing the electrode 4 to the conductive wire 1, the material of the conductive wire 1, etc. are selected appropriately, the object to be protected against corrosion can be more effectively protected from corrosion.

To explain the operation in the above configuration, the corrosion protection current from the power supply passes through the conduction line 1 and flows from the electrode 4 to the object to be protected. That is, since the fixed portions of the conductive wire 1 and the electrode 4 form a non-conductive film over their entire length, they will not melt or wear out, and therefore will not fall off or break. In other words, (1) the entire length of the conductive wire in the non-conductive coating part and the fixed part between the conductive wire and the electrode do not come into contact with water, so no anti-corrosion current is generated; No dissolution).

(2) In particular, since the fixed part of the conductive wire and the electrode also forms a non-conductive film and does not come into contact with water, local corrosion due to contact between dissimilar metals at this fixed part and concentration of anti-corrosion current at the end of the electrode may occur. There is no chance of the part of the electrode attached to the conductive wire falling off or breaking.

Effects of the invention As described above, the invention has the following effects.

(1) If this electrode is placed in the center of the tank rather than the top surface of the tank, the distance to the tank inner wall, heating element, heat exchanger, flue, etc. can be evenly distributed, and corrosion protection can therefore be made even. Moreover, this electrode can be expected to have the same effect as conventional multiple electrodes.
The mounting configuration is also simple and inexpensive.

(2) If the conductive wire is made of Cu, etc., there will be no voltage drop to each electrode along the way, and therefore the corrosion protection current will be effective with the same voltage.

(3) By appropriately bending the middle of a long conductive wire, it can be applied evenly to complex parts such as gaps, shadows, and remote parts in various configurations of hot water storage tanks. It can prevent corrosion. At this time, even if the conductive wire comes into contact with a certain part of the hot water storage tank, there is no adverse effect on the anticorrosion effect because there is a non-conductive coating.

(4) A non-conductive coating is formed over the entire length of the conductive wire and the part where the electrode is attached to the conductive wire, so there is no melting or wear of the coating, and this prevents the electrode from falling off from the conductive wire. No breakage.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electrode according to one embodiment of the present invention, FIGS. 2 and 3 are partial views of electrodes of other embodiments,
FIG. 4 is a diagram showing the corrosion protection structure of a conventional hot water storage tank. 1... Conductive wire, 4... Electrode, 5... Non-conductive coating.

Claims (1)

[Scope of utility model registration request] A plurality of electrodes, a conductive wire to which the electrodes are fixed at appropriate intervals, a non-conductive film formed to cover the conductive wire and the portion of the electrode fixed to the conductive wire, and the non-conductive film. A cathodic protection electrode comprising a sealing material that holds one end of the conduction wire covered with a film and a mounting plug, and formed to apply a corrosion protection current to the conduction wire.