JPS60205332A - Electrolyte solution detection wire - Google Patents

Abstract

PURPOSE:To detect certainly an electrolytic solution leaked from a pipe, tank in wide range by using a pair of wires made of metals different in ionization tendency and covered with electrolytic solution holding material as the detecting part. CONSTITUTION:A pair of conducting wires 2a, 2b made of metals different in ionization tendency, e.g. copper and aluminum are covered with electrolytic solution holding material, e.g. polyethylene textile materials 4a, 4b. Said two wires are protected by liquid permeating protection material, e.g. ''Tetron'' yarn textile 8 to compose the detecting wire. When the electrolyte, e.g. salt water is leaked over wide range, the detecting wire (a) is placed, the wires 2a, 2b are connected to a volt meter (b), a resistance (c) to detect the leakage of the electrolytic solution. Then, salt water is permeated into the materials 8, 4a, 4b, and electromotive force is generated in the meter (b) between the wires 2a, 2b as electrode. Consequently, even if the electrolytic solution is leaked over wide range, said solution can be detected easily, without using many detectors, and the cost is decreased.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention mainly relates to an electrolyte solution detection line suitable for detecting electrolyte solution leakage in various systems including transportation or storage such as pipelines and tanks. .

<Prior Art> Conventionally, various detection elements have been used to detect leakage of electrolyte solutions such as acids, alkalis, and salts. However, all conventional devices detect leakage at a single point, and the area in which leakage can be detected is extremely limited. Therefore, partial leakage of the electrolyte solution in a wide area along the circumference of the pipeline or storage tank cannot be adequately covered. If conventional detection elements were to be used to detect leaks within a wide range as described in Section 2, a large number of detection elements would be required, and ancillary structures would also have to be attached, leading to problems such as high costs.

Purpose of the present invention: It is an object of the present invention to provide an electrolyte solution detection line capable of reliably detecting partial leakage of electrolyte solution in a wide area along pipelines, storage tanks, etc., by solving the conventional problems. shall be.

<Structure> In order to achieve the above-mentioned object, the present invention provides an electrolyte solution holding structure with excellent electrolyte solution resistance between a pair of electrode wires, which are made of metals having at least surfaces different from each other, as electrolyte solution detection wires. It is characterized in that a body is interposed to form a core, and a liquid-permeable protective structure is coated on the core.

<Examples> Hereinafter, examples of the present invention shown in the drawings will be described in detail.

FIG. 1 is a cross-sectional view of the electrolyte solution detection line of this embodiment. This electrolyte solution detection line 1 includes a pair of parallel electrode lines 2a,
2b, and electrolyte solution holding structures 4a and 4b are provided on each of the parallel electrode wires 2a and 2b, respectively, and are twisted together in parallel to form the parallel electrode wires 2a and 2b.
A core 6 with electrolyte solution holding structures 4a and 4b interposed therebetween.
This core 6 is covered with a protective structure 8. The characteristics required of the core 6 of the electrolyte solution detection wire 1 are that the electrolyte solution holding structures 4a and 4b absorb and retain the leaked electrolyte solution, and that the leaked electrolyte solution and the pair of parallel electrode wires 2a%lb are non-conductive. The purpose is to form a reversible battery.

Therefore, the pair of parallel electrode wires 2a, 2b is preferably a combination that has a difference in ionization tendency and can provide a high electromotive force in order to increase detection sensitivity. Therefore, an electrode wire whose at least the surface is made of metals having different components, such as a dissimilar metal wire, an alloy wire, a clad wire, a plated wire, or a combination of these two, can be appropriately selected to satisfy this condition. . Specifically, for example, a combination of copper wire and aluminum wire or silk combination of copper wire and aluminum/alloy wire is preferable because a high electromotive force can be obtained, but other combinations such as copper wire and tin-plated copper wire, aluminum wire and tin-plated copper wire, etc. Examples include combinations. In addition, the electrolyte solution holding structure 4
A and 4b are preferably those having excellent electrolyte solution resistance and low hygroscopicity to avoid the influence of humidity. For example, a braided body made of polyethylene monofilament yarn is recommended, but a porous layer made of an organic or inorganic composition may also be used. Furthermore, the protective structure 8 is preferably one that has high liquid permeability and is 1/1 resistant to electrolyte solutions, such as a braided body of Tei-ron yarn, polyethylene (3) yarn, etc. Alternatively, a porous layer made of an organic or inorganic composition may be used.

FIG. 2 is a cross-sectional view of an electrolyte solution detection line in another embodiment. What should be noted about the electrolyte solution detection line 10 of this embodiment is that of the pair of parallel electrode lines 12a and 12b, only one parallel electrode line 12a is provided with the electrolyte solution holding structure 14. Earth-parallel electrode wires 12a, 12
b. The structures of the electrolyte solution holding structure 14 and the protection structure 18 are the same as those of the embodiment shown in FIG.

FIG. 3 is a cross-sectional view of an electrolyte solution detection line in yet another embodiment. In the electrolyte solution detection wire 20 of this embodiment, the central inner parallel electrode wire 2a of a pair of inner and outer parallel electrode wires 22a and 22b is covered with an electrolyte solution holding structure 24, and the outer periphery of this electrolyte solution holding structure 24 is covered with an electrolyte solution holding structure 24. A core 26 is constructed by coaxially surrounding the external electrode wire 2b, and a protective structure 28 is coated on the outer periphery of the core 26. Therefore, in this electrolyte solution detection line 20, the external parallel electrode line 22
Since liquid permeability is required for the external parallel electrode wire 22b, a braided structure made of thin metal wire (4), a perforated metal tape, or the like is used as the external parallel electrode wire 22b. The rest of the structure is the same as the embodiment shown in FIG.

Therefore, in each electrolyte solution detection line 1, 10.20 shown in FIGS. 1 to 3, if a leak occurs in a part of the pipe, tank, etc. in which the electrolyte solution detection line is installed, the leaked electrolyte solution will be transferred to the protective structure 13. 18.28, and are absorbed and retained by the electrolyte solution holding structures 4al 4b, 14.24, - pairs of parallel electrode wires 2a, 2b, 12a, 12b, 2
Since an electromotive force is generated between 2a and 22b, it is possible to immediately detect the occurrence of leakage based on this electromotive force.

Experimental Example The following experiment was conducted to confirm the leakage detection performance of the electrolyte solution detection line of the present invention. First, a pair of parallel electrode wires is made of a flexible aluminum wire with a diameter of 1.2 m+.
Each of the parallel electrode wires (200 denier polyethylene monofilament thread 3 as a ζ electrolyte solution holding structure)
After preparing a 16-strand braided body, we twisted them together to form a core, and covered the core with a protective structure consisting of a 24-strand braided body with four 250-denier Tetoron threads. A required electrolyte solution detection line was obtained.Next, a sample of about 5 m was taken from this electrolyte solution detection line, and the electromotive force generated by the electrolyte solution was measured using the apparatus shown in FIG. 4(a).

This measuring device consists of a voltmeter b for measuring the electromotive force generated in the electrolyte solution detection line a, a resistor C connected in parallel between the terminals of this voltmeter, and a metering pump d for dripping the electrolyte solution. The value of is set smaller than the internal resistance value of the voltmeter. Then, a certain amount of electrolyte solution was sequentially dropped from the metering pump d onto the electrolyte solution detection line a, and the electromotive force was measured with a voltmeter. 1,35 each as electrolyte solution
, an aqueous solution of IOH in hydrochloric acid and an aqueous solution of IJium hydroxide, and an aqueous 1,3N sodium chloride solution and a saturated aqueous sodium chloride solution. A typical measurement example is shown in FIG. As is clear from the figure, only 0.0
A rise in the generated electromotive force was observed from the time of dropping the electrolyte solution of 4-, and almost reached equilibrium at about Q, lme.

In other words, it was confirmed that this electrolyte solution detection line has excellent responsiveness and can detect a slight leakage of the electrolyte solution.

Next, suppose that the electrolyte solution detection line a is used outdoors and is immersed in rainwater, and as shown in Figure 4+b+, the entire length of the electrolyte solution detection line a is immersed in water that fills a container f. A comparative experiment was conducted with a case where the sample was immersed in an electrolyte solution.

Figure 6 summarizes the measurement results, where the horizontal axis is the low loss value connected in parallel to the voltmeter, and the vertical axis is the measured value of the generated electromotive force.

As can be seen from this result, by utilizing the difference in electromotive force generated when the detected liquid is water and when the electrolyte solution is used, it is possible to identify and detect only the leakage of the electrolyte solution to be detected.

However, when the liquid to be detected is a hydrochloric acid aqueous solution or a sodium chloride aqueous solution, the measured value of the generated electromotive force when a parallel resistor is not connected or the connected resistance value is large is partially different from that for water. If they are equal, it is difficult to distinguish between the two.

However, when the value of the parallel resistance is made smaller, the decrease in the measured value of the generated electromotive force is greater when the detected liquid is water than when the detected liquid is an electrolyte solution, resulting in a difference in the measurement (7) of the two. , identification becomes possible.

Therefore, in actual leakage detection using an electrolyte solution detection line, leakage detection sensitivity can be increased by connecting a resistor in parallel to the voltmeter and selecting an appropriate resistance value.

Effects> As described above, according to the present invention, an electrolyte solution retaining structure having excellent electrolyte solution resistance is interposed between a pair of electrode wires made of metals having at least surfaces having different components to form a core. This core is covered with a liquid-permeable protective structure to form an electrolyte solution detection line, so if this electrolyte solution detection line is installed, what happens? Partial leakage of the electrolyte solution in a wide area along the line, storage tank, etc. can be reliably detected. Therefore, there is no need to provide multiple detection elements as in the past, and the cost required for leakage detection is reduced (costs can be reduced).In addition, by providing a protective structure, damage to the core can be prevented and long-term use can be achieved. Not only is this structure compensated for, but it is also advantageous in terms of handling during installation because it can be integrated as a line (8).

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIGS. 1 to 3 are cross-sectional views of an electrolyte solution detection line, FIG. The figure is an explanatory diagram showing a typical measurement example, and FIG. 6 is a detection characteristic diagram of an electrolyte solution detection line. 1, 10.20---- Electrolyte solution detection line, 2a
, 2b, 12a. 12b, 22a, 22b---Parallel electrode wire, 4
a, 4b, 14°24... Electrolyte solution holding structure, 8.18.28... Protection structure. Applicant TAC Electric Cable Co., Ltd. Agent Patent Attorney Oka 1) Hide Kazu

Claims (3)

[Claims] (1) A core is constructed by interposing an electrolyte solution holding structure with excellent electrolyte solution resistance between a pair of parallel electrode wires made of metals whose surfaces have different components; An electrolyte solution detection wire characterized by being coated with a liquid-permeable protective structure. (2) The electrolyte solution detection wire according to claim 1, wherein the protective structure is a braided body made of thread having excellent electrolyte solution resistance. (3) The electrolyte solution detection wire according to claim 1, wherein the protective structure is a porous layer made of an organic or inorganic composition having excellent electrolyte solution resistance.