JPS6217697Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a water leak detection device.

As shown in FIG. 1, a water leakage detector according to the prior art includes a container 1 in which water leaked from inside a device (not shown) is collected, and comb-shaped electrodes 2, 3. At this time, the bottom surface 1a of the container 1 and the electrode 2,
A slight gap is provided between the electrode 2 and the lower end surface of the electrode 3, and a voltage is applied between the electrode 2 and the electrode 3. Therefore, when water accumulates in the container 1 and reaches a predetermined amount or more and touches the electrodes 2 and 3, electricity flows between the electrodes 2 and 3, and this is used to detect water leakage.

However, in such conventional technology, in order to be able to detect leakage of pure water with high electrical resistance,
The electrodes 2 and 3 are shaped like a comb to increase the surface area where they can come into contact with water, and are also interlocked to reduce the distance between adjacent electrodes. As a result, even if there is minute dust, electrodes 2 and 3
As a result, electricity may flow between the electrodes 2 and 3 through the continuously adhered dust, resulting in malfunction.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, an object of the present invention is to provide a water leakage detector that can accurately detect water leakage. The configuration of the present invention that achieves this purpose consists of a first heat insulating plate that faces the bottom of the container through a small gap, and a second heat insulating plate that is disposed above the first heat insulating plate and has the same heat capacity as the first heat insulating plate. a heater having a non-conductive and water-resistant outer covering and attached to the first heat-insulating plate and the second heat-insulating plate so that the contact areas are equal; and the first heat-insulating plate and the second heat-insulating plate. and a temperature sensor respectively provided so as to come into contact with the temperature sensor.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Note that parts that are the same as those in the prior art are given the same numbers, and redundant explanations will be omitted.

FIG. 2 is a plan view showing an embodiment of the present invention, and FIGS. 3 and 4 are a front view and a side view thereof, respectively. As shown in these figures, the first heat insulating plate 4 is attached to the lower surface of the U-shaped mounting plate 6 by means of mounting screws 5a.
It is in close contact with a sheathed heater 7 interposed between the lower surface of the first heat insulating plate 4 itself and the first heat insulating plate 4 itself. The second heat insulating plate 8 is formed to have the same shape and quality as the first heat insulating plate 4 so as to have the same heat capacity, and, like the first heat insulating plate 4, is closely attached to the sheathed heater 7 by means of mounting screws 5b. It is also attached to the upper surface of the mounting plate 6. At this time, the sheathed heater 7, which has a heater housed in a non-conductive and water-resistant pipe, has its lower corrugated portion connected to the mounting screw between the lower surface of the mounting plate 6 and the first heat insulating plate 4. It is interposed by locking with 5a, and the mounting plate 6 is attached continuously to this.
The upper wavy portion of the same shape is interposed between the upper surface of the mounting plate 6 and the second heat insulating plate 8 by being locked with a mounting screw 5b. That is, the one continuous sheathed heater 7 has the first heat insulating plate 4 and the second heat insulating plate 8,
They are in contact for the same length. Therefore, when electricity is applied to the sheathed heater 7, the first heat insulating plate 4 and the second heat insulating plate 8
The temperature is almost the same as that of The first heat retaining plate 4 and the second heat retaining plate 8 are each provided with a temperature sensor 9 such as a thermistor or thermocouple connected to a circuit (not shown) to detect a temperature difference between the two. The mounting plate 6
are a support tube 10 and a support screw 1 with low thermal conductivity.
1 is supported at a predetermined height above the bottom surface 1a, and the lower surface of the first heat insulation plate 4 mounted on the mounting plate 6 faces the bottom surface 1a through a gap of 1 to 2 mm. There is.

In this embodiment, when low-temperature water accumulates in the container 1 due to water leakage and comes into contact with the first heat-insulating plate 4, the sheathed heater 7 causes the first heat-insulating plate 8 to have approximately the same temperature as the second heat-insulating plate 8. The temperature of the plate 4 decreases. Therefore, the temperature difference between the two is detected by the temperature sensor 9 and a circuit (not shown), and water leakage is detected from this. More specifically, the temperature sensor 9
If a thermistor is used as the sensor, a bridge circuit is configured including this thermistor, and a water leak can be detected by emitting a water leak detection signal when the temperature difference exceeds a predetermined value. In addition, when a thermocouple is used as the temperature sensor 9, a circuit is constructed such that the voltages generated by the two thermocouples cancel each other out, and when there is no temperature difference, the output voltage of the circuit becomes zero, and a temperature difference occurs. When this happens, water leakage can be detected by generating an output voltage from the circuit based on the difference between the two generated voltages. In addition, when the temperature of the water due to water leakage is higher than the temperature of the first heat insulating plate 4, the temperature of the first heat insulating plate 4 increases due to this water, and the temperature of the first heat insulating plate 4 and the second heat insulating plate 8 increases. Because of the difference, water leakage is detected in the same way as described above. In addition, in this embodiment, various support tubes 10 with different lengths are prepared, and by replacing them, the distance between the first heat insulation plate 4 and the bottom surface 1a can be easily adjusted, so that water leakage can be detected. You can easily change the starting amount of water.

As specifically explained above in conjunction with the embodiments, according to the present invention, the second heat insulating plate and the first heat insulating plate with which the water due to leakage comes into contact are kept at approximately the same temperature by the heater, and the water due to the leakage is kept at approximately the same temperature as the first heat insulating plate. When the heat insulating plate is touched and its temperature changes, water leakage is detected by detecting this temperature change, so leakage of any liquid, not just water, can be accurately detected.
Furthermore, it does not malfunction due to adhesion of dust or the like, and is robust.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a water leakage detector according to the prior art, FIG. 2 is a plan view showing an embodiment of the present invention, FIG. 3 is a front view thereof, and FIG. 4 is a side view thereof. In the drawings, 1 is a container, 1a is a bottom surface, 4 is a first heat insulating plate, 7 is a sheathed heater, 8 is a second heat insulating plate, and 9 is a temperature sensor.

Claims (1)

[Scope of utility model registration request] A first heat insulating plate facing the bottom of the container through a small gap, a second heat insulating plate disposed above the first heat insulating plate and having the same heat capacity, and a non-conductive and water resistant heat insulating plate. a heater that has an outer covering and is attached to the first heat insulation plate and the second heat insulation plate so that the contact area is equal; and a temperature sensor that is provided so as to come into contact with the first heat insulation plate and the second heat insulation plate, respectively. A water leakage detector characterized by having.