JPS61128148A - Sensor for detecting leaked water from water distributing pipe - Google Patents

Abstract

PURPOSE:To enable the detection of leaked water in a wide or narrow place, by using a long sensor constituted so that two insulated conductors having an insulating property and one insulated conductor having an insulating layer comprising an insulating resin are twisted and a bridge circuit is constituted of the twisted conductor element. CONSTITUTION:Two insulated conductors 1, 2, each of which is formed by providing a braided layer 5 comprising a fiber having an insulated property such as a glass fiber on a copper wire 4, and one insulated electric wire 3 formed by providing a polyethylene insulating coating layer on the copper wire 4 are twisted to constitute a leaked water detection sensor. One conductor 3 is used in supplying the current from a power source and two conductors 1, 2 are used in detecting leaked water. When the leakage of water is generated at a point (x), the conductors 1, 2 are brought to a continuity state by water penetrated into the fiber braided layers 5 and a power source is supplied from this point and, at this time, a water leaked place is detected from the resistances of the resistor 8, variable resistor 9 and leaked water detection cables A-X, X-B-A for constituting a bridge circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water leakage detection sensor for detecting water leakage from, for example, a water distribution pipe within a building and preventing water from flooding into equipment within the building.

(Prior art and problems to be solved) Recently, many sophisticated computer computers and their peripheral equipment have been installed in buildings, factories, and other buildings to control the automatic operation of office automation/equipment. There is. However, these devices are extremely susceptible to water, so in the unlikely event that they are piped inside a building,
When a water leak occurs in a sewer pipe, it is necessary to promptly detect the leak location and take emergency measures.

However, with the small sensors commonly used in the past,
To detect a wide area within a building, it is necessary to install many sensors at regular intervals, making it difficult to detect water leaks in large spaces. Furthermore, since the wire sensor only checks electrical continuity when water enters between two wires, it cannot detect where water leaks in the wire.

(Means for Solving the Problems) The present invention solves the above-mentioned problems and provides a water leak detection sensor for water distribution pipes that can detect surface wood over a wide range. The feature is that two strands of insulated conductor wire with an insulated conductor and one strand of insulated wire with a coating layer of an insulating resin material are placed on a pedestal, and by using these to form a bridge circuit, it is possible to prevent water leakage. It is something to detect.

(Embodiment) Fig. 1 is a cross-sectional view of an embodiment of the water leakage detection sensor of the present invention. A coating layer of an insulating resin material made by extruding polyvinyl chloride, etc., or coating and baking polyester, polyamide resin, etc. on the two conductor wires (1) ■ and the copper wire (4). (1 strip of insulated wire (3) with 61) are twisted together.

Therefore, the above insulated conductor wire (1) I2J and the insulated wire (
3) are of equal length, one of the insulated conductor wires (11 is used for power supply, the other one (2) and the insulated wire (3)
) is used for water leak detection.

FIG. 2 is an explanatory diagram of the principle of detecting a water leak location using the above-mentioned water leak detection sensor. In the drawings, (1) is an insulated conductive wire for power supply, ■ is an insulated conductive wire for thin ice detection, and (3) is an insulated wire for water detection. Also, ■ is lI'1' current power supply,
(2) is a resistor r^ for the bridge circuit configuration, (2) is a variable resistor ra for the circuit configuration, and (Ot) is a galvanometer.

In FIG. 2, when water capture occurs at point X, the insulated conductive wire (1) (1) becomes conductive due to the water seeping through the fiber braid (2), and power is supplied from this point. At this time, the resistance ra1r4 and the line resistances r^-1 and -0 of A-X and X-B-A of the silk detection cable Y-6≠ constitute a bridge. When the variable resistor r6 is adjusted to achieve bridge balance, the following equation is established.

However, R is the line resistance per unit length, and therefore the distance to the point where the water leakage occurs (X) is, and the water leakage point can be detected.

(Effects of the Invention) According to the water leakage detection sensor of the present invention, since it is in the form of a cable as described above, a long one can be used, and water leakage can be detected over a wide range. It has the advantage of being able to monitor areas that are difficult for people to enter, and even when the Hinaga detection range is expanded, it can be handled simply by connecting a cable.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the water leak detection sensor of the present invention, and FIG. 2 is an explanatory diagram of the principle of detecting a water leak location using the sensor of the present invention. 1.2... Insulated conductor wire, 3... Insulated wire, 4... Conductor, 5... Fiber braid, 6... Insulating coating layer. Figure 1

Claims (2)

[Claims] (1) 2 of insulated conductor wire with braided fibers having insulating properties
A water leakage detection sensor for a water distribution pipe, characterized in that it is formed by twisting a wire and a single wire of an insulated wire having a coating layer of an insulating resin material. (2) A water leakage detection sensor for a water distribution pipe according to claim 1, wherein a water leakage point is detected by configuring a bridge circuit.