JPH06231628A - Manufacture of flooding detector - Google Patents

Abstract

PURPOSE:To manufacture a flooding detector which can detect whether there is a flooding or not along a long distance or a wide scope, more easily extensively than the conventional way, and at a low cost. CONSTITUTION:Between a soaking pan 10 housing a solution made by dissolving a water soluble organic such as a water soluble cellulose ester or a partially saponified polyvinyl alcohol in a solvent, and a conductor 2 in the above solution, a specific voltage is applied. As a result, the water soluble organic is electrodeposited on the surface of the conductor 2, and thereby, a water soluble insulating membrane 3 which consists of a water soluble organic is formed on the surface of the conductor 2, so as to obtain a flooding detector 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a water-immersion detector for detecting water-immersion in a communication cable, various electric devices, buildings and the like.

[0002]

2. Description of the Related Art Generally, in a communication cable, when the coating is broken and water enters the inside, there are problems such as a leakage of electric current, making communication impossible, and mixing noise.
Further, when various electric devices such as a computer are wetted on the floor surface due to rain leaks in a building, not only is electric leakage extremely dangerous, but an accident such as a short circuit of the electric device and a breakdown occurs. Therefore, in order to prevent such an accident from occurring, a means capable of detecting the presence or absence of water infiltration is required.

In order to detect the presence or absence of such inundation, it is conceivable to use an existing moisture sensor or the like. However, since the moisture sensor can detect the inundation in a limited and narrow range, a long distance or When it is necessary to detect the presence or absence of water in a wide area, it is necessary to install a large number of moisture sensors on site over a wide area, which not only requires time and labor for purchasing the moisture sensor. And there is a drawback that the construction work for its installation is costly.

As a conventional technique for solving such a drawback, a water immersion detector a as shown in FIG. 4 is provided. In this water immersion detector a, a coating layer c such as expanded polyethylene is formed on the surface of a conductor b made of a copper wire or the like, and the coating layer c is cut out at a predetermined pitch p ′ to form a conductor.
An exposed portion e exposing b is provided.

In order to detect the presence or absence of water infiltration using this water intrusion detector a, as shown in FIG. 5, a pair of water infiltration detectors a and a are arranged in advance at the water intrusion detection location, and each water infiltration detector is detected.
One end of each of a and a is connected to the detector s', the other end is opened, and a predetermined voltage v'is applied from the detector s'to each of the immersion detectors a and a. In this state, if water enters the inundation detection area, the exposed parts of both inundation detectors a, a
The electric current i'flows between e and e through the invading water, and the decrease in voltage v'is detected by the detector s'and an alarm is issued to detect the inundation. It is like this.

[0006] With such an infiltration detector a, a presence or absence of infiltration can be detected over a long distance or a wide range simply by extending the length of the infiltration detector a, a. There is an advantage that it is not necessary to install a large number and the cost can be reduced accordingly.

[0007]

However, in such water immersion detectors a, a, it takes a lot of time and effort to form the exposed portions e, e, and as a result, the manufacturing cost of the water intrusion detector still remains. Get higher

Further, since it is inconvenient to handle each of the inundation detectors a, a in a disjointed state, both inundation detectors a, a
Even if they are used as they are simply twisted with each other, in such a use, there are exposed portions e, e which contact each other in a large number of exposed portions e, e of both the water immersion detectors a, a. However, even if water does not enter due to this contact, the detector s'may malfunction if there is water intrusion, so in order to eliminate this malfunction, twist both inundation detectors a and a together. When using it, it is necessary to take measures such as interposing an insulator between both the water immersion detectors a and a, and similarly to the above, the manufacturing cost is high and the above advantages cannot be utilized. There was a problem such as.

[0009]

The present invention has been made in order to solve the above-mentioned problems, and it is not necessary to provide the above-mentioned exposed portion on the water-immersion detector, and the water-immersion detector is twisted. Even when it is used, it is not necessary to interpose an insulator between the water immersion detectors, and it is possible to detect water infiltration over a long distance or over a wide range with high sensitivity, and at a low manufacturing cost.

The inventors of the present invention have found that water-soluble organic substances such as water-soluble cellulose ethers are easily dissolved when water is attached to them, but when water is not attached, they act as an electrical insulator and are mechanically deformed. I found the fact that there is also Noh.

The present invention has been made by paying attention to such a fact. After immersing a conductor for a water-immersion detector in a solution containing a water-soluble organic substance, the surface of the conductor in the solution is charged with the water-soluble organic substance. It is characterized in that a water-soluble insulating film made of a water-soluble organic material is deposited.

[0012]

According to the above, the conductor for the water immersion detector is immersed in the solution containing the water-soluble organic substance, and the water-soluble organic substance is electrodeposited on the surface of the immersion in the solution to form the water-soluble insulating film. . Although this water-soluble insulating film dissolves easily when water adheres, it acts as an electrical insulator when water does not adhere, so there is no need to expose the conductor locally as in the conventional case, and it is possible to use it in a consistent process. Can be manufactured continuously,
Since they can be twisted together, they can be manufactured very easily and at low cost.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a water immersion detector manufactured by the method of the present invention.

FIG. 1 shows a state in which a pair of immersion detectors 1 and 1 are twisted at a predetermined pitch (for example, 50 to 70 mm). Each immersion detector 1 and 1 is made of a copper wire or the like. The surfaces of the conductors 2 and 2 are coated with water-soluble insulators 3 and 3.

FIG. 2 is a block diagram of an apparatus for manufacturing the above-mentioned water immersion detector 1.

In FIG. 2, reference numeral 10 denotes a conductive dipping pan made of stainless steel or the like, and an insertion hole 12 for the conductor 2 is formed at the bottom of the dipping pan 10. A solution 14 in which a water-soluble organic substance such as water-soluble cellulose ether or partially saponified polyvinyl alcohol is dissolved in a solvent such as water or alcohol is stored in the dipping pan 10.

When water-soluble cellulose ether powder is used as the water-soluble organic substance, a mixture of alcohol and water is used as the solvent, and partially saponified polyvinyl alcohol is used as the water-soluble organic substance. For this, water is used as a solvent. In addition, this solution 14
Has a certain degree of viscosity, so there is no possibility that the conductor 2 will drop from the insertion hole 12 while being transferred.

Reference numeral 16 denotes a drying furnace for scattering the solvent from the solution on the surface of the conductor 2 for the water-immersion detector pulled up from the dipping pan 10. The ambient temperature of the drying furnace is set to about 300 ° C., for example. It In addition, this drying furnace 16
There is a heat source such as a heater inside, but instead of the drying furnace 16, it is also possible to provide a chamber without such a heat source inside and to blow dry hot air into this chamber.

Reference numeral 18 denotes a conductive delivery bobbin made of steel or the like, and the bare conductor 2 is wound around the delivery bobbin 18 in advance. Reference numeral 20 is a winding bobbin for winding the manufactured water immersion detection body 1, and 22 is a guide roller.

Reference numeral 24 denotes a DC power source, the positive electrode of which is connected to the dipping pan 10 and the negative electrode of which is connected to the conductor 2 wound around the delivery bobbin 18.

Next, a method of manufacturing the water immersion detector 1 using this apparatus will be described.

From the delivery bobbin 18, a conductor 2 made of a copper wire or the like that has been annealed in advance is delivered, and passes through a guide roller 22 and an insertion hole 12 of the immersion pan 10 to dip the pan 1.
Guided within 0. Here, since the positive electrode of the DC power supply 24 is connected to the dipping pan 10 and the negative electrode thereof is connected to the conductor 2 wound around the delivery bobbin 18, a current flows between the dipping pan 10 and the conductor 2. Instead of connecting the positive electrode of the DC power source 24 to the dipping pan 10, an appropriate other conductor may be placed in the solution and the positive electrode may be connected to the other conductor.

With the application of the DC power source 24, the water-soluble organic substance contained in the solution 14 is charged and electrodeposited on the surface of the conductor 2, and the amount of this electrodeposition is determined by the applied voltage of the DC power source 24. It is controlled by the size and the transfer speed of the conductor 2. Then, the solution is attached to the conductor 2 after electrodeposition, and the conductor 2 is introduced into the drying furnace 22 so that the water-soluble organic matter remains in the deposition solution and only the solvent is removed. Then, the solvent is scattered to form the water-soluble insulating film 3 made of a water-soluble organic substance on the surface of the conductor 2. As a result, the manufacture of the desired water immersion detector 1 is completed, and the water immersion detector 1 is wound around the winding bobbin 20 via the guide roller 22.

With respect to the water-immersion detector 1 manufactured as described above, the electrical characteristics of the water-soluble insulating film 3 having a film thickness of 13 μm were examined. The withstand voltage was about 60 KV / mm and the insulation resistance was A value of about 200 MΩ-km was obtained. The withstand voltage of polyethylene and vinyl chloride used as insulating material is about 30 KV / mm, and
Considering that the specification of the insulation resistance of vinyl chloride is about 50 MΩ-km, the water-soluble insulating film 3 sufficiently satisfies the required electrical characteristics.

The water-immersion detector 1 manufactured in this manner is placed at the water-immersion detecting portion in a state in which two wires are twisted together, as shown in FIG. 1, for example. Then, in order to detect the presence or absence of water intrusion, as shown in FIG. 3, one ends of the conductors 2 of each water intrusion detector 1 are connected to each other via a resistor R ₀ , and the other end is connected to the detector s. It

In this state, if there is no flood,
Since the strands 2 and 2 of the water immersion detectors 1 and 1 are insulated from each other by the water-soluble insulator 3 except for both ends thereof, one of the water immersion detectors 1 and the resistance R _{0 is} detected from the detector s. , And a slight amount of current i ₀ flows through the other water immersion detector 1.

On the other hand, when water penetrates into the inundation detection area and comes into contact with the inundation detection bodies 1, 1, the water-soluble insulators 3, 3 in the areas in contact with the water are locally dissolved and the conductor 2, The two are short-circuited, and a current i flows through this short-circuited portion. That is, since the current i flows by bypassing the resistor R ₀ , the current value becomes equal to or higher than the threshold value, and thus the detector s detects that the water is inundated.

In the embodiment shown in FIG. 2, guide rollers 22 are arranged above and below the dipping pan 10 to pull up the conductor 2 so that the dipping pan 10 can pass through the dipping pan 10. It is also possible to dispose the guide rollers 22 on the left and right and allow the conductor 2 to pass through the dipping pan 10 from the horizontal direction.

[0029]

As described above, according to the present invention, it is possible to manufacture a water immersion detector which can detect the presence or absence of water in a long distance or in a wide range with high sensitivity, more easily and at a lower cost than ever before. Moreover, since the water-soluble insulating film is formed by electrodeposition, not only is it easy to control the film thickness,
Excellent effects such as maintaining uniformity can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which two water-immersion detectors obtained according to the present invention are twisted together.

FIG. 2 is a configuration diagram of a manufacturing apparatus for carrying out the method for manufacturing a water immersion detector of the present invention.

FIG. 3 is a system configuration diagram for detecting the presence or absence of water immersion using a water immersion detector.

FIG. 4 is a perspective view of a conventional water immersion detector.

FIG. 5 is a system configuration diagram for detecting the presence or absence of water immersion using a conventional water immersion detector.

[Explanation of symbols]

1 ... Water intrusion detector, 2 ... Conductor, 3 ... Water-soluble insulating film, 14 ...
Solution, 24 ... DC power supply.

Claims (2)

[Claims] 1. A water-soluble organic substance comprising a water-soluble organic substance obtained by immersing a conductor for a water immersion detector in a solution containing a water-soluble organic substance, and then electrodepositing the water-soluble organic substance on the surface of the conductor in the solution. A method for manufacturing a water immersion detector, comprising forming an insulating film. 2. The method for producing a water immersion detector according to claim 1, wherein the water-soluble organic substance is water-soluble cellulose ether or partially saponified polyvinyl alcohol.