JPH05187955A - Water leakage detecting belt and manufacture thereof - Google Patents

Abstract

PURPOSE:To make installation and maintenance simple by miniaturization and to attain improvement in a detecting performance and easiness of restoration after detection by a method wherein two conductors each made of a corrosion-resistant material and having a rectangular section are juxtaposed at a prescribed interval and coated with insulative resin so that one insulated cable be made, and exposed electrode parts are constructed on the opposite outer sides thereof. CONSTITUTION:Two flat-type stainless steel wires about 0.3mm thick and 1.5mm wide are juxtaposed at an interval of about 1.4mm and put in an extruder and are extruded, being covered with fire-resistant transparent vinyl chloride resin 2, so that an insulated cable be formed. Next, exposed electrode parts 3 are provided by cutting the outer side of the stainless steel wire 1 slightly by using a cutting die of which a cutting length is about 5mm. The die cutting is executed at a length of about 25mm repeatedly and symmetrically for the opposite outer wire parts. A detecting belt obtained in this way is relatively small in size and easy to install and rare to have mulfunctioning due to dew formation, and restoration thereof after a water detecting operation can be attained simply and quickly by wiping it with waste or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall surface inside a building, a floor surface,
The present invention relates to a water leak detection zone for detecting water adhering to a device surface and the like and a manufacturing method thereof.

[0002]

2. Description of the Related Art Water pipes, cooling water, air-conditioning condensed water pipes, etc. are installed on the floor surface, wall surface, underfloor, etc., and when water adheres, an electric circuit that passes through the water causes
Various leak detectors are known for detecting the presence of water.

The first prior art, which is the actual exploitation 49-550
88 is a feeder wire for a television, in which a part of the cable 6 in which the two electric wires 4, 4 ′ are covered with the flexible insulating material 5 is peeled off, and the two electric wires of the parts 8, 8 ′ are A sensing element is described in which two electrodes 7, 7'are placed close to each other. Both ends 10, 10 'of the block 9 of insulating material are fixed with rivets 11, 11'.
This is very troublesome to install, and it is easy for erroneous contact of the electrodes to occur, and it is troublesome to recover the electrodes once they are wet. Further, the electric wire having no corrosion resistance is also exposed, and the life of the device is short. FIG. 5 shows a plan view of this first prior art detection band.

The second prior art, SAIkai Sho 58-162
In 052, two long conductors 12 are arranged side by side in parallel, sandwiched with plastic tape from both upper and lower sides,
Disclosed is a water detection cable in which a conductor-exposed portion is provided by punching out holes 14 of a size that spans both conductors at a predetermined interval in the central portion by heating and fusing to form an insulating coating 13. ing. Reference numeral 15 is a double-sided adhesive tape which is used when attached. This water detection cable has the following problems. 1) In order to detect water from the outside, it is necessary for water to enter the punched hole surrounded by the conductor and plastic tape, and it takes time to detect water leakage. 2) Once water enters, it takes time to remove the water from the punched part and restore the detection function. FIG. 6 shows a perspective view of this second prior art sensing cable.

A third prior art, Japanese Patent Laid-Open No. 61-165
650 includes two long conductors each having an exposed surface that contacts the liquid when the cable is immersed in the liquid, and the conductors are electrically connected by the liquid along the non-linear path when the cable is immersed in the liquid. As described above, a water leakage detection cable having an insulating member that contacts the conductor and physically separates the conductor is disclosed. However, it is not described for those skilled in the art what the operation function and manufacturing method of this detection cable are. For example, in FIG. 7, a metal wire 16 coated with a conductive polymer is used as a conductor, a pocket is provided in the insulating member 17 and fixed, and then a plurality of exposed portions 1 are formed.
8 is a perspective view showing an embodiment in which it is described that 8 and 18 ′ are provided, but it is not clear how to manufacture, but in the structure of FIG. 7, a gap is formed between the insulating member 17 and the conductor 16. Since water is easily generated, it is difficult to remove the water once it has infiltrated, so that there are problems in detection, performance, and recoverability.

FIG. 8 is a cross section of another embodiment which also includes a concave insulating member 21 which contacts the conductors 19 and 20 and separates the conductors so that the conductors are electrically connected by liquid when the recesses are filled. Although it is a figure, it is unclear how the liquid filled in the recess forms a circuit with the conductor, but if it cannot be detected until the recess is filled with water, the detection function is inferior. Is.

Further, in this detection cable, a circuit is formed through a conductive polymer, but since the specific resistance value of the conductive polymer is higher than that of metal and the variation is large, it is not suitable for accurate water leak detection. Is.

[0008]

[Means for Solving the Problems] The water leakage detection zone according to the present invention solves the above-mentioned various problems and can be manufactured by a rational method, is small in size, easy to install and maintain, and has excellent detection performance. It is easy to recover after detection.

According to the present invention, in an insulated cable in which two long conductors each having a rectangular cross section and made of two corrosion-resistant materials are housed in an insulating resin coating with a constant interval, the outer edge portions on both sides are The present invention relates to a water leak detection zone, which is characterized in that the coating is partially lacking and the outer surface of the conductor is exposed at that portion.

The manufacturing method is made of a corrosion resistant material,
A process of arranging two long conductors having a rectangular cross section side by side at regular intervals and extrusion-coating them with an insulating resin to form one insulated cable, and coating the outer edge portions on both sides of the insulated cable and one of the conductors. A method of manufacturing a water leakage detection zone, which comprises the step of punching out a portion and exposing the outer surface of the conductor at the portion.

The corrosion resistant material used in the present invention includes:
Stainless steel, tin-plated copper, nickel alloy and the like are preferable.

As the insulating resin, soft vinyl chloride,
It is possible to use a material such as tetrafluoroethylene having water resistance and good punching workability.

In the present invention, the step of obtaining one insulated cable can be performed by using a coating extruder having two cross-bed dies. Next, the step of punching out a part of the conductor and exposing the outer surface of the conductor is performed by a pressing machine, and the punching die is preferably a rectangle or an oblong circle.

In the case of punching, in addition to the coating resin portion on the outer edge portion, it is desirable that the conductor portion is cut off very slightly in order to surely expose the outer portion of the conductor.

In this case, it is advantageous for the workability of punching that the conductor has a rectangular cross section. If the conductor has a circular cross section, the workability is poor and the variation in the finished product becomes large.

The conductor-exposed portions formed by this punching may be provided symmetrically or in a staggered manner.

Further, by encapsulating the detection band thus obtained in a fiber mesh tube which is hydrophobic and has good water wettability, the detection performance is further enhanced, and the physical protection state of the electrode portion and the appearance are good. Be done. Specifically, a method in which a polyester fiber mesh tube is dipped in a surfactant solution and dried is used.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an example of an insulated cable of the present invention, and FIG. 2 is a sectional view of the same.

SUS304 having a thickness of 0.3 mm and a width of 1.5 mm
Two flat stainless steel wires 1 are lined up side by side at 1.4 mm intervals and fed to the extruder, and flame-retardant transparent vinyl chloride resin 2 (UL;
An extruded insulated cable was obtained while being coated with VW-1 (suitable product).

Next, the exposed electrode portion 3 was provided by punching with a punching die having a punching length of 5 mm to such an extent that the outside of the stainless steel wire was slightly shaved. The punching was performed symmetrically with respect to both outer line portions, and the length was repeatedly set to 25 mm. FIG. 3 is a plan view of the obtained detection band, and FIG. 4 is a sectional view thereof. The obtained detection zone was made into a product by immersing it in a 0.5% solution of Florard FC430 manufactured by Sumitomo 3M Co., Ltd., and deliquoring it to obtain a product. The obtained detection zone is relatively small and easy to install. Further, malfunction due to dew condensation is relatively small, and recovery after water detection can be easily and quickly performed by wiping with a waste cloth or the like.

[Brief description of drawings]

FIG. 1 is a plan view of an insulated cable used in the present invention.

FIG. 2 is a cross-sectional view of the insulated cable used in the present invention in FIG.

FIG. 3 is a plan view of a water leak detection zone according to the present invention.

FIG. 4 is a cross-sectional view of the water leakage detection zone according to the present invention of FIG.

FIG. 5 is a plan view of a first prior art detection band.

FIG. 6 is a perspective view of a second prior art sensing cable.

FIG. 7 is a perspective view of a third prior art water leak detection cable.

FIG. 8 is a sectional view of a water leakage detection cable of another embodiment of the third prior art.

[Explanation of symbols]

 1 Flat stainless wire 2 Flame-retardant transparent vinyl chloride resin 3 Exposed electrode part

Claims (2)

[Claims] 1. A step of arranging two long conductors made of a corrosion-resistant material and having a rectangular section in a side-by-side manner at regular intervals and extrusion-coating with an insulating resin to form one insulated cable. A method of manufacturing a water leakage detection zone, comprising: coating outer edge portions on both sides; and punching out a part of the conductor to expose the outer surface of the conductor at the part. 2. In an insulated cable in which two long conductors having a rectangular cross section made of two corrosion-resistant materials are housed in an insulating resin coating with a constant spacing, the outer edge portions on both sides are A leak detection zone characterized by a partial lack of coating and an exposed outer surface of the conductor at that portion.