JPH0473736B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is designed to prevent water leakage that may impede the functions of the equipment or interfere with work in a room or factory where equipment is installed. The present invention relates to a water leak detection band used to detect leaked water or dew when condensation occurs, and a method for manufacturing the same.

(Prior art) Conventionally, in order to prevent water leakage at the installation location that may impede the functions of equipment or hinder work, two electrodes each having an electrode portion made of an exposed metal plate or metal rod have been used. The two electrode bodies are placed opposite each other at a certain distance and attached to the equipment or the floor in an appropriate manner, and a potential difference is applied to the electrode parts of both electrode bodies, so that water such as water leakage that occurs will cause both electrode parts to be in a conductive state. Detection is done by detecting the current that flows through the formation of an electric circuit. However, with this method,
When the area to be detected is large, it is time-consuming and expensive to attach the electrode body, and conversely, when the area is narrow, it becomes difficult to attach it, and furthermore, it is difficult to detect unless the amount of water leaking is relatively large. There is a drawback.

As one of the things that compensate for the above drawbacks,
In Japanese Patent No. 2718, an electrode band is proposed as an alternative to the above-mentioned electrode body. Two stranded stainless steel wires are embedded in a transparent flexible synthetic resin strip in parallel and separated, and two electrodes with sharp legs formed by punching and bending are inserted at a small distance. The leg parts are attached to the strip body so as to be connected to different stranded wires, and the ends are bent and crimped along the strip body, and the legs are attached at a considerable distance from each other in the same manner. This is an electrode strip for water leakage detection and alarm attached to the water leakage detection alarm.

This electrode strip is used by stretching it along the floor of the place where water leakage detection is required, and connecting one end of both stranded wires directly to a power source, and the other end to the power source via a signal lamp, etc. be done.

(Problems to be Solved by the Invention) In the above-mentioned electrode band, the tips of the legs are inserted into a synthetic resin band-like body and brought into contact with the twisted wires inside to form an electrode. The drawback is that it is difficult to connect wires with low contact resistance, takes time and effort to manufacture, and is inevitably expensive. In addition, the detection function deteriorates due to dirt on the exposed electrodes, so they must be cleaned from time to time, but it is structurally difficult to remove dirt, which poses a problem in terms of maintenance. Furthermore, since each electrode is exposed around the strip, it must be appropriately covered to avoid contact with anything other than water leakage, but it also has the disadvantage that it is extremely troublesome and difficult to do so.

(Means for Solving the Problems) The present invention has been made by focusing on such conventional problems, and provides a new type of water leakage detection band made by a special method that has not been seen before. By using this, it is easy to install it in the place where water leakage is detected, and it is also easy to clean when the detection function deteriorates due to dirt on the electrode, and it is easy to maintain and manage, dramatically improving its performance. The purpose of this project is to improve the performance and solve the above problems.

The present invention involves encapsulating a plurality of suitable parallel metal stranded wires at predetermined intervals in a band-like body made of a synthetic resin having flexibility and electrical insulation, and one side of the band-like body in the thickness direction. Or a water leakage detection band having a large number of metal exposed surfaces on both sides in the length direction, the large number of metal exposed surfaces being the peaks and valleys that periodically exist on the outer surface of the stranded wire. The water leakage detection zone is characterized in that the crests are disposed discontinuously and close to each other with an interval between the troughs.

In addition, the present invention injects a thermoplastic synthetic resin having flexibility and electrical insulation properties into a mold while holding and moving a plurality of suitable twisted metal wires in parallel at predetermined intervals, and at the same time Cool nearby,
When forming a band-shaped body using the coating layer formed around the stranded wires, a jig installed at a position in the mold before the synthetic resin is cured is used to coat the upper surface or the upper and lower surfaces of the stranded wires. The peaks and peaks that are periodically present on the outer surface of the stranded wire in the length direction are caused to slide in contact with each other.
A method for manufacturing a water leakage detection band, characterized in that a large number of exposed metal surfaces are formed adjacent to each other and not connected to each other at the crests, separated by the intervals between the troughs. .

(Function) Since the metal exposed surfaces of appropriate metal strands formed in large numbers discontinuously, close to each other, and parallel to each other in the length direction are used as electrodes, there is no need to provide special electrodes as in the past. Moreover, it is easy to manufacture,
It can be manufactured at a lower cost than conventional products.

In addition, since the strip does not have electrodes like conventional ones, you can freely select the attachment point, and since each electrode is not exposed around the strip, there is no need to cover it, making it easier to attach. It is extremely easy to work with.

In addition, when the detection function deteriorates due to dirt on the exposed metal surface of the electrode, it is easy to clean the electrode, and even if water leaks, it can be easily wiped with a cloth to restore the original condition. It has good recovery characteristics and is very easy to maintain and manage.

In addition, since the band-shaped body can be attached closely to an attachment point such as the floor, it is possible to detect even the slightest leakage of water, and in addition, a large number of discontinuous and parallel exposed metal surfaces constitute electrodes. Since the spacing between the same-polar electrodes is very narrow and the sensor can be detected over almost the entire surface, water leakage at the attached location can be reliably detected.

In addition, since the core wire itself made of a suitable twisted metal wire constitutes the electrode, there is no connection point for the electrode as in the conventional case, so there is no occurrence of failure due to connection, and the device is extremely reliable.

(Example) The present invention will be described in detail below based on FIGS. 1 and 2 showing one example thereof. Stainless steel stranded wire 1 made by twisting 11 stainless steel wires (SUS304) with a diameter of approximately 0.3 mm
(approximately 1.2 mm diameter) are pulled and held in parallel at approximately 4 mm intervals in the mold while melting flame-retardant vinyl chloride powder that has flexibility and electrical insulation properties. When the coating layer 2 is injected into the mold and cooled near the exit to form a band 3 with a rectangular band shape around the stranded wire 1, the strands 3 are melted in the mold. The upper surfaces of both stranded wires 1, 1 are brought into contact and slid on a jig installed at a position before the vinyl chloride is cured, and the ridges that are periodically present on the outer surface of the stranded wires are removed in the length direction.・
A water leakage detection zone 5 is formed in which a large number of oblique oblong elliptical metal exposed surfaces 4 are formed in parallel and discontinuously close to each other at the peaks, separated by the intervals between the valleys.

When the upper surface of the stainless steel stranded wire 1 is completely removed to form a continuous exposed metal surface, the water leakage detection band 5 can be easily removed from the strip 3 by simply pulling the stainless steel stranded wire 1 toward the exposed metal surface with a slight force. To avoid this, a special manufacturing method is used to form a large number of parallel obliquely oblong elliptical exposed metal surfaces 4 that are discontinuous and close to each other, and the covering layer 2 is formed between each exposed metal surface 4. By burying both the stainless steel stranded wires 1, 1, the belt-shaped body 3 is firmly held and has a mechanical strength that can withstand the attachment work.

This water leakage detection band 5 is a metal exposed surface 4 of the band-shaped body 3.
With the cable facing down, fix it with adhesive tape at appropriate locations on the floor or other attached location where you want to detect water leakage, then connect one of the core wires made of stainless steel stranded wire 1 directly to a power source, and connect the other to an appropriate location. It is used by connecting to a power source via a marking device. In the event that a water leak occurs at an attached location such as a floor, the parallel exposed metal surfaces 4 are electrically connected by water, detect a circuit, and current flows, so that the water leak is detected by the indicating device.

In this case, since the metal exposed surface 4 of the stainless steel stranded wire 1, which is formed in large numbers in parallel and discontinuously close to each other in the length direction, is used as the power source, there is no need to provide a special electrode as in the conventional case. Moreover, since the water leakage detection band 5 is easy to manufacture, it can be manufactured at nearly half the price compared to conventional ones.

In addition, since the strip-shaped body 3 is not provided with electrodes as in the past, the attachment points can be freely selected, and since each electrode is not exposed around the strip-shaped body 3, there is no need to cover it. Installation work is extremely easy.

In addition, when the detection function deteriorates due to dirt on the exposed metal surface 4, it is easy to clean the electrode, and even if it gets wet due to water leakage, it can be easily wiped off with a cloth etc. It has good recovery characteristics and is very easy to maintain and manage.

In addition, since the strip 3 can be attached closely to an attachment point such as the floor, it is possible to detect even the slightest leakage of water, and the exposed metal surfaces 4, which are discontinuous and are formed in large numbers in parallel and close together, can be used to detect electrodes. Since the spacing between the electrodes of the same polarity is very narrow and detection is possible over almost the entire surface, water leakage at the attached location can be reliably detected.

Furthermore, since the core wire made of the stainless steel stranded wire 1 itself constitutes the electrode, there is no connection point for the electrode as in the conventional case, so there is no occurrence of failure due to connection, and the device is extremely reliable.

In the above embodiment, the diameter of the stainless steel wires used and the number of wires twisted together are not limited to these numbers, and may be changed depending on the purpose of use. In addition, although two stainless steel stranded wires 1 were used, for example, in order to detect a break in the stainless steel stranded wire 1, three stainless steel stranded wires 1 are required. good. In addition, stainless steel wire was used because it has excellent corrosion resistance, because if the electrode corrodes during installation, the detection sensitivity will decrease, and cleaning work to return the detection sensitivity to the previous level is difficult. An appropriate metal wire such as a titanium wire may be used. In addition, the synthetic resin used to form the band-shaped body 3 is
Any synthetic resin other than vinyl chloride may be used as long as it has flexibility and electrical insulation and is a thermoplastic resin. Furthermore, although the exposed metal surface 4 is formed only on one side of the strip 3 in the thickness direction, it may be provided on both sides of the strip 3 in the thickness direction depending on the purpose of use. However, depending on the purpose of use, as shown in FIG. 3, a gutter-like recess 6 (FIG. 3-A) or a recess 6' (FIG. 3-A) may be formed in the longitudinal direction of the strip 3. b), and a metal exposed surface 4' or 4'' is provided at the bottom 7 or 7', or a groove-shaped recess 8 (Fig. 3-c) is provided in the longitudinal direction of the strip 3. and the metal exposed surface 4 is located at the bottom of the metal exposed surface 4.

Claims (1)

[Claims] 1. A plurality of suitable metal stranded wires arranged in parallel at predetermined intervals are encapsulated in a band-shaped body made of a synthetic resin having flexibility and electrical insulation, and the thickness of the band-shaped body is The water leakage detection zone is provided with a large number of metal exposed surfaces in the length direction on one or both sides of the strand, and the large number of metal exposed surfaces are composed of peaks and peaks that are periodically present on the outer surface of the stranded wire. Separating the interval between the valleys among the valleys,
A water leakage detection zone characterized in that the zones are discontinuously disposed close to each other in the mountain portion. 2. Water leakage detection according to claim 1, characterized by comprising two metal strands parallel to each other at a predetermined interval, and an exposed metal surface only on one surface in the thickness direction of the band-shaped body. band. 3. The water leakage detection band according to claim 1, characterized in that it comprises two metal twisted wires parallel to each other at a predetermined interval, and metal exposed surfaces on both sides in the thickness direction of the band-shaped body. . 4. The water leakage detection band according to claim 1, comprising three parallel metal strands spaced apart at a predetermined interval. 5. According to any one of claims 1 to 4, wherein the exposed metal surface of the stranded metal wire is located at the bottom of a recess formed in the longitudinal direction of the strip. Water leak detection zone as stated. 6 While holding and moving a plurality of suitable metal strands in parallel at predetermined intervals in the mold,
When a thermoplastic synthetic resin having flexibility and electrical insulation is injected and cooled near the outlet to form a band with a coating layer formed around the strands, the strands are injected into the mold. A jig installed at a position before the synthetic resin hardens is placed on the top surface of the stranded wire or
The lower surfaces are brought into contact and slid, and the peaks and valleys of the peaks and valleys that are periodically present on the outer surface of the stranded wire in the length direction are spaced apart, and the strands are mutually discontinuous at the peaks. A method of manufacturing a water leakage detection band, characterized by forming a large number of exposed metal surfaces provided in close proximity to each other.