JPH0413657B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water leak position detection system that electrically detects the intrusion of water, and more particularly to a water leak position detection system using a water leak sensor that prevents water from adhering between electrodes.

Traditionally, water leakage detection has been done using the resistance value between electrodes when immersed in water, or using a pair of dissimilar metals for the electrodes, which utilizes the fact that the electrodes and water form a battery. .

There is a method using electric wires as shown in FIG. 1, which takes advantage of the decrease in resistance value between electrodes. This involves stripping off the insulator and submerging the area in water, which changes the resistance value between the electrodes, and detects water leakage from this change in resistance value. In addition, even if the electrodes shown in Figure 1 can determine the presence or absence of water leakage, it is not possible to determine the location of water leakage as it is, so a pair of detectors is installed at each location to detect the location of water leakage. There is. however,
The electrodes have a larger surface area, and the narrower the electrode spacing, the better the detection sensitivity, but if the spacing is too narrow, water will accumulate between the electrodes, and even if the water recedes, the same condition as when water leaks will occur. Another problem is that increasing the electrode spacing increases the size of the electrode.

The present invention has been developed in view of the above-mentioned difficulties, and consists of arranging a plurality of electric wires as electrodes at predetermined intervals, exposing a predetermined length of the conductor as electrodes from their terminal ends, and molding resin between the electrodes. It is an object of the present invention to provide a water leak position detection system that prevents water from adhering and can determine the water leak position using a water leak sensor with increased mechanical strength.

Hereinafter, preferred embodiments of the water leakage position detection system according to the present invention will be described with reference to the drawings.

As shown in FIG. 2, the water leak sensor 1 used in the water leak position detection system of the present invention has a group of insulated wires (12 wires) arranged in a circular shape, and the insulated wires are covered by a length l from the terminal end T. The electrode 2, which has been peeled off to expose the conductor Q, is molded with a resin 3 (epoxy, rubber mold, etc.), leaving the side surface S of the conductor of the wire. The electrodes 2 are divided into detection electrodes 4 (8 electrodes, indicated by white circles) and common electrodes 5 (4 electrodes, indicated by black circles).The detection electrodes 4 and common electrodes 5 are used to improve sensitivity as a water leak position detection system. are always placed next to each other. Incidentally, a group of insulated wires arranged in a circular shape in advance is molded, and the molding resin and wire coating on the terminal end surface T and the outer circumferential portion up to a length l from the terminal surface are scraped to expose the conductors of the wire group. It may also be used as the electrode 2.

Here, FIG. 3 shows a circuit of an example of a system connection for detecting a water leak position using a plurality of water leak sensors 1. In the figure, as an example, water leakage sensors 1 are arranged at water leakage detection positions at addresses 21 and 40, and are selectively connected to a plurality of detection cords A to COM. At address 21, for example, in the water leakage sensor 1 shown in FIG.
The conductors Q of the pair and third pair of detection electrodes 4 are connected to detection cords A, C, and E, respectively. At address 40, the conductors Q of the first, second, and third pairs of detection electrodes 4 are connected to detection cords D, F, and G, respectively. Common electrode 5 at both addresses 21 and 40
(4 wires, indicated by black circles) are all detection codes together.
Connected to COM. In this example, the conductors Q... of the fourth pair of detection electrodes 4 are not connected to the detection cord, but they may be connected to any detection cord, or they may be connected to any detection cord to increase the number of water leakage detection positions. You may increase the number of cords and connect them as described above.

When using the water leakage sensor 1, the end surface T of the electrode 2 of the water leakage sensor 1 is arranged to face the surface where water leakage occurs, and the water leakage detection signal is transmitted by the detection code A~
Detected on COM terminals. In other words, one end of the detection cord A~COM is connected to the DC voltage +
When V is applied and the electrodes 4 and 5 at address 21, for example, are immersed in water, the electrodes 4 and 5 exposed for a predetermined length l, for example,
The insulation between the detection cords A, C, E and COM decreases due to the resistance of water on the side surface S of the electrode 5.
The voltages at C and E decrease. If this is detected individually by a detector (not shown) and encoded, it can be determined that address 21 is flooded. The address detection code is a BCD signal with weights of 1, 2, 4, 8, 16, etc. Absolute addresses can be detected by combining these, and in Figure 3, addresses can be set up to 63 addresses. I can do it. In the water leakage sensor 1 shown in FIG. 2, in the case of address 21, the detection electrode 4 is connected to the detection codes A (2 ⁰ ), C (2 ² ), and E (2 ⁴ ), respectively, as described above. It is set. Below, each address is similarly connected to indicate the detection position in accordance with the BCD conversion, and the detection code G indicates the parity of the address. The outputs of the detection codes A to G and COM of the signals detected by the water leakage sensor 1 are subjected to level detection through a comparator and signal processed by a microcomputer, minicomputer, etc.

In this way, the water leak position detection system of the present invention is applied to a circuit that detects a large number of water leak positions, and even if the number of detection points increases, the number of detection lines is reduced compared to conventional systems due to BCD processing. I can finish it.

In the above embodiments, ordinary round wires were used as the electric wires used for the electrodes of the sensor used in the water leakage position detection system. Alternatively, if it is desired to increase the number of electrodes with the same diameter, a fan-shaped structure as shown in FIG. 4b may be used. In addition, in order to increase safety, or when detecting not only water but also viscous substances, a fourth
It is preferable to provide a taper at the tip of the detection part as shown in Figures c and d. This tapered portion has a water cutting effect. Furthermore, although the electric wires forming the electrodes are arranged in a ring shape, the object of the present invention can also be achieved even if they are arranged in a rectangular shape and molded.

According to the water leakage position detection system of the present invention, since the space between the electrodes of the water leakage sensor is molded with resin, it is possible to prevent water from adhering between the electrodes.
In the system in which the above addresses are set and a group of electric wires corresponding to the addresses are set, each address has a water leakage sensor end face T...
If the electrodes are installed at different positions in the vertical direction, it will be possible to notify not only that the electrode has been flooded with water, but also the water level.

As is clear from the above embodiments, according to the present invention, a plurality of electric wires are molded with resin, and a predetermined length of electrode is exposed from the terminal end. A water leakage sensor is constructed that can prevent water from adhering between the two, is small in size, and has strong mechanical strength, and can be used to detect the location of a water leakage.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a conventional water leak position detection system using electric wires, FIG. 2 is a front view showing a water leak sensor used in the water leak position detection system of the present invention, and FIG. The circuit diagram of the water leak position detection system for detecting the water leak position using the water leak sensor shown in FIG. It is a schematic diagram showing a modification. 1...Water leak sensor, 3...Mold resin, 2,
4, 5... Electrode for water leakage detection, T... Termination, Q...
...Conductor, l...predetermined length, S...electrode side.

Claims (1)

[Claims] 1 A water leakage sensor 1 in which a predetermined length l of a conductor is exposed from the terminal end of a plurality of electric wires to form electrodes 2, 4, and 5 for water leakage detection, and the space between the electrodes is molded with resin, leaving at least the side surfaces of the electrodes. and a plurality of detection codes (A to COM) selectively connected to the electrodes of the water leakage sensor and for detecting and encoding the detection signals. system.