JP2572785Y2 - Electrode wire for pipe corrosion protection - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode wire for providing corrosion protection to a pipe such as a water pipe which mainly passes water.

[0002]

2. Description of the Related Art Conventionally, as a method of applying corrosion protection to a pipe of this type for the purpose of preventing red water or the like, electric corrosion protection has been used. As shown in FIG. 2, as shown in FIG. 2, a long electrode wire 2 is inserted through the wall of the pipe 1, and the electrode wire 2 and the pipe 1 are connected to each other.
And the wire 1 is connected to the
A voltage of + is applied to the battery to eliminate the potential difference of the local battery on the metal surface, which causes corrosion of the conduit 1, and to prevent corrosion of the metal on the inner surface of the conduit by preventing elution of the metal.

[0003] The electrode wire 2 used in this cathodic protection
In this case, a conductive metal wire is used, but the metal wire must not contact the inner surface of the pipe 1 to cause a short circuit, and if the metal wire is exposed to water in the pipe 1, Need to be.

As the electrode wire 2, the applicant has previously invented a structure in which a monofilament yarn 4 of a non-conductive synthetic resin is roughly wound around the surface of a metal wire 3 as shown in FIG. The application has been published as Kaihei 3-44488.

[0005]

However, in the electrode wire 2, since the monofilament yarn 4 is wound alone on the metal wire 3, the winding angle α of the monofilament yarn 4 with respect to the metal wire 3 is large, and deviation is likely to occur. .

In particular, when the electrode wire 2 is inserted into the conduit 1, the monofilament thread 4 is hooked on the edge of the terminal of the inner tube at a connection portion of the tube at a bend portion of the conduit 1,
A force is required to insert the electrode wire 2, and the monofilament yarn 4 moves along the metal wire 3 and locally concentrates, so that the winding state of the monofilament yarn 4 around the metal wire 3 becomes uneven. .

Therefore, in the portion where the monofilament yarn 4 becomes excessively coarse, the metal wire 3 may come into contact with the inner surface of the pipe 1 to cause a short circuit. When the monofilament yarn 4 becomes excessively dense locally, In that portion, the current between the metal wire 3 and the inner surface of the conduit 1 is obstructed, and the anticorrosion effect is impaired.

The present invention has been made in view of such circumstances, and it is difficult for the present invention to be caught on the inner surface of the pipe 1 when the pipe 1 is inserted into the pipe 1 and that the monofilament yarn 4 is displaced even if an external force is applied, resulting in coarse and dense. It is an object of the present invention to provide an electrode wire 2 having no wires.

[0009]

According to the present invention, a plurality of monofilament non-conductive synthetic fiber filaments having a diameter of 1/10 to 1/2 of the diameter of the insoluble metal wire are provided on the surface of the insoluble metal wire. A plurality of twisted strands are spirally wound, and the winding angle of the strand with respect to the insoluble metal wire is 15
The angle is about 45 °, and the strand is densely wound so that the insoluble metal wire is not largely exposed.

The present invention will be described below with reference to the drawings. FIG.
1 shows the electrode wire 2 for corrosion protection of a conduit of the present invention, in which a plurality of strands 6 formed by twisting a plurality of monofilament yarns 5 of synthetic fibers on the surface of an insoluble metal wire 3 are spirally densely formed. It is wound around.

The insoluble metal wire 3 is a metal wire that does not corrode or elute in water, and a specific example thereof is a titanium wire plated with platinum. ing.

The metal wire 3 bends the pipe 1 while bending.
It is necessary to have a degree of flexibility that allows it to pass through the inside and maintain a strength that can withstand the external force due to the water flow for a long period of time.
Those having a thickness of about 5 to 2 mm are preferred.

On the surface of the metal wire 3, a plurality of strands 6 are closely wound around each other. Strand 6
Is about 15 to 45 °, and more preferably about 20 to 30 °.

When the winding angle α is less than 15 °, the strand 6 and the metal wire 3 become nearly parallel, and the strand 6 is separated and the wound state is easily broken. On the other hand, when the angle exceeds 45 °, when the electrode wire 2 is inserted into the conduit 1, the strand 6 is caught on the edge of the bend tube of the conduit, and the penetrability is poor.

The strand 6 is formed by twisting a plurality of monofilament yarns 5. As the monofilament yarn 5, a synthetic fiber having water resistance can be used. For example, polyethylene or polypropylene is suitable.

The monofilament yarn 5 has a diameter of 1/10 to 1/2 of the diameter of the metal wire 3. The diameter of the monofilament yarn 5 is 1/10 of the metal wire 3
Less than the monofilament yarn 5 in the strand 6
The space between them is reduced, and the corrosion prevention effect is inferior. On the other hand, if it is 1/2 or more, the rigidity of the monofilament yarn 5 and the strand 6 increases, and it becomes difficult to wind the monofilament yarn 5 and the strand 6 around the metal wire 3.

A strand 6 is formed by twisting a plurality of the monofilament yarns 5. The strand 6 can be wound around the insoluble metal wire 3, and the metal wire 3 is connected to the conduit 1 in the conduit 1. 1 is supported so as not to contact the inner surface, the diameter of the strand 6 is 20 to 200% of the thickness of the metal wire 3, more preferably 50 to 10%.
It is appropriate to set it to about 0%.

When the electrode wire 2 of the present invention is inserted into the conduit 1 having the bend portion 1 ', it is preferable to use a spacing member 7 as shown in FIG. FIG.
And a plurality of fins 9 extending radially and rearward from the holding portion 8 as shown in FIG. By inserting the wire 2 into the pipe 1 while holding the wire 2 and positioning the spacing member 7 at the bend 1 ′ of the pipe 1,
The electrode wire 2 is held at the center of the pipe 1, and a uniform anticorrosion effect can be obtained over the entire pipe 1.

[0019]

In the present invention, a plurality of strands 6 are wound around the surface of the metal wire 3, but the strands 6 are wound densely with each other and the winding angle with respect to the metal wire 3 is small. In addition, when the bend pipe is inserted into the pipe line 1, it is less likely to be caught on an edge portion of the bend pipe and the strand 6 does not shift.

The strands 6 are tightly wound around the metal wire 3 and have no space between the strands 6. However, since the strands 6 are formed by twisting a plurality of monofilament yarns 5, The monofilament yarn 5
A gap is formed between them. Therefore, even if there is no interval between the strands 6, the metal wire 3 is in contact with the external water through the gap between the monofilament yarns 5, and the amount of current between the metal wire 3 and the pipeline 1 is secured.

[0021]

EXAMPLE In order to confirm the effect of the present invention, a metal wire 3 was prepared by plating a 0.8 mm diameter titanium wire with platinum plating, and a polyethylene monofilament was wound around the metal wire 3 by various methods. Wire 2 was made.

Example 1 A polyethylene monofilament yarn 5 having a diameter of 0.3 mm
The strands are twisted to form strands 6, and the four strands 6 are
The metal wire 3 was densely wound so that the pitch was 10.9 mm and the winding angle was 30 °.

COMPARATIVE EXAMPLE 1 Instead of the strands 6 in the above-mentioned Example 1, the diameter of the strands was 0.1 mm.
Using a 6 mm polyethylene monofilament yarn, the monofilament yarn was wound around the metal wire 3 in the same manner as in Example 1.

Comparative Example 2 Two strands 6 and a pitch of 5.
The wire was densely wound around the metal wire 3 so as to have a winding angle of 3 mm and a winding angle of 50 °.

Comparative Example 3 The monofilament yarn used in Comparative Example 1 was used in place of the strand 6 in Comparative Example 2, and the monofilament yarn was wound around the metal wire 3 in the same manner as in Comparative Example 2.

Comparative Example 4 One monofilament yarn used in Comparative Example 1 was wound around a metal wire 3 at a winding angle of 50 ° and a pitch of 5.3 mm. Comparative Example 4 corresponds to the above-mentioned conventional example.

The following performance tests were performed on the electrode wires 2 obtained in Example 1 and Comparative Examples.

Performance Test Electrode Efficiency Test Regarding the electrode wires 2 of the above Examples and Comparative Examples, an electrode wire 2 having a length of 10 cm and a square iron plate having a length of 5 cm were immersed in water.
Suspended at intervals of 10 cm, the electrode wire 2
A voltage from 2 V to 8 V was applied at intervals of 1 V between the steel plate and the iron plate, and the amount of current during the application was measured.

The amount of current was measured in the same manner for only the metal wire 3 on which the polyethylene monofilament yarn was not wound.
The electrode efficiencies for each voltage were determined by the following formula, and the average thereof was defined as the average electrode efficiency. Electrode efficiency = Current of electrode wire / Current of metal wire x 100 (%)

Penetration test The electrode wire 2 is inserted into a pipe having a length of 50 cm and a straight pipe of 20A nominally connected to a 90 ° bend pipe, and the electrode wire 2 is pulled from one end of the pipe with a force of 20 kgf. Then, how many bend tubes can be inserted was measured.

The results of the test are shown in Table 1.

[0032]

[Table 1]

[0033]

As can be understood from the above results, in Comparative Examples 1 and 3, a plurality of thick monofilament yarns are densely wound around the metal wire 3, and the metal wire 3 is formed by the monofilament yarn. Blocked from outside water, pipe 1
Current is cut off, and the electrode efficiency is low.

In Comparative Examples 2, 3 and 4, since the winding angle of the monofilament yarn or strand 6 with respect to the metal wire 3 is large, when the electrode wire 2 is inserted into the conduit 1, the monofilament yarn or strand is used. 6 is caught on the edge portion of the bend pipe, and the insertability is deteriorated.

The prior art example corresponds to comparative example 4. According to this example, although the electrode efficiency is extremely good, since the winding angle is large and the interval between adjacent monofilament yarns is large, the bending efficiency of the bend tube is small. It can be understood that it is easily hooked on the edge portion, and particularly poor in penetrability.

In contrast, in the embodiment, the strand wound around the metal wire 3 is a strand 6 in which a plurality of monofilament yarns 5 are twisted.
Even if the metal wire 3 is wound tightly, there is a gap between the monofilament yarns 5 because the strand 6 is formed by twisting a plurality of monofilament yarns 5, and the metal wire 3 comes into contact with external water through the gap. As a result, a large amount of current flows between the pipe 1 and the electrode 1, and a high electrode efficiency is obtained.

Further, since the winding angle of the strand 6 with respect to the metal wire 3 is small, the strand 6 does not catch on the edge of the bend pipe when the electrode wire 2 is inserted into the conduit 1.
It can penetrate many bend tubes with a small force.

Further, since the strand 6 is tightly wound around the metal wire 3, even if the strand 6 gets caught on the edge of the bend pipe, the strand 6
Is not largely displaced along the metal wire 3, the metal wire 3 does not locally contact the pipe 1, and the metal wire 3 is not excessively covered by the strands 6.
A uniform anticorrosion effect can be obtained throughout.

[Brief description of the drawings]

FIG. 1 is an exploded front view of a part of an electrode wire of the present invention.

FIG. 2 is a central longitudinal sectional view showing a state where an electrode wire is inserted into a conduit.

FIG. 3 is a front view showing a part of a conventional electrode wire in a cross section.

FIG. 4 is a central longitudinal sectional view in a state where an electrode wire is inserted using a spacing member.

FIG. 5 is a perspective view of a spacing device.

[Explanation of symbols]

 2 electrode wire 3 metal wire 5 monofilament yarn 6 strand

Continuing on the front page (72) Kenji Yamada 3-6-18 Shibaura, Minato-ku, Tokyo Nishihara Sanitation Industry Co., Ltd. (72) Katsuo Kita 3-32-2 Torikai Nori, Settsu-shi, Osaka (56 ) References JP-A-55-12884 (JP, A) JP-A-3-44488 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of monofilament yarns (5) of non-conductive synthetic fibers having a diameter of 1/10 to 1/2 of the diameter of the insoluble metal wire (3) on the surface of the insoluble metal wire (3). A plurality of twisted strands (6) are spirally wound, the winding angle of the strand (6) with respect to the insoluble metal wire (3) is 15 to 45 °, and the insoluble metal wire (3) is largely exposed. Characterized in that the strands (6) are wound tightly to such an extent that they do not occur,