JPH0436443Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention consists of a resistance measurement circuit that measures the resistance value between the electrodes by supplying power between the electrodes located on the inspection part of the floor, and a resistance value determination circuit that generates an output signal when the value falls below a predetermined level;
The present invention relates to a floor moisture detection device equipped with an alarm that responds to the output signal.

[Problems that conventional technology and ideas try to solve]

This type of device is used for automotive rain leakage tests, etc. Conventionally, two electrode needles are positioned on the inspection area, and if the voltage value between them falls below a predetermined level, moisture detection is performed. It was announced. Therefore, when detecting moisture by inserting electrode needles into areas that cannot be seen, such as moisture existing between the floor and mat of a car, if the back side is a conductor, there may be a short circuit or low voltage between the two electrode needles. There was a problem of resistance and false notifications.

Therefore, it is an object of the present invention to provide a floor moisture detection device of the type mentioned at the beginning, which is capable of detecting with high reliability even moisture on the floor of an automobile, etc., which is covered with mats and cannot be seen with the naked eye. .

[Means and actions for solving problems]

In order to achieve this purpose, the present invention consists of three needles that have electrodes arranged almost in a straight line and can be inserted through a mat installed on the floor. was retracted more than the tips of the other needles, and power was supplied between the center needle and at least one of the other two needles. Even if the two outer needles contact the conductor, the central needle does not come into contact with the conductor, making it possible to measure the electrical resistance corresponding to the moisture present between the outer needles. Even in floor areas covered with mats, moisture can be detected by penetrating the mats without mistaking them for conductive floors.

〔Example〕

FIG. 1 shows a floor moisture detection device according to an embodiment of the present invention. In the figure, reference numeral 10 denotes an electrode holder on which three conductive needles 11 to 13 are arranged in a straight line and can be inserted through a mat 21. The central needle 12 is slightly shorter than the outer needles 11 and 13, and the outer needles are connected to the electrode holder 1.
0 and is short-circuited and led out as a lead wire 14. A lead wire 15 is similarly led out from the needle 12 and connected to the positive electrode of the battery 16 through a resistor R1. The negative electrode is connected to the needle 1 through the lead wire 14.
Connected to 1 and 13. The battery 16 and the resistance R1 are the needle 12 and the resistance Ra between the needles 11 and 13,
A resistance value measuring circuit is configured to detect the parallel rigid composite resistance of Rb as a divided voltage with respect to the resistor R1.

17 is a resistance value determination circuit that generates an output signal when the detected voltage, that is, the voltage between the lead wires 14 and 15 falls below a predetermined level. 18 is a lamp display operated by the output signal from this resistance value determination circuit;
This is an alarm device that is composed of a buzzer or the like and notifies the generation of a detection signal.

The operation is as follows.

For example, when testing an automobile for rain leakage, the outer needles 11 and 13 are brought into contact with the floor 20, and in this state, the needles 12 are retracted more than the outer needles 11 and 13, so that they float above the floor 20. When moisture has not entered, the resistors Ra and Rb are in an open state, and the power supply voltage of the battery 16 is input to the resistance value determination circuit 17, and the alarm 18 is not activated. If moisture 22 is present, needle 1
2, the combined resistance of the resistors Ra and Rb decreases, and the input voltage of the resistance value determination circuit 17 falls below a predetermined level, causing the alarm 18 to notify the presence of moisture.

Even if the floor 20 is conductive, the outer needle 11,
With the needle 13 in contact, the needle 12 is floating above the floor 20 and the measurement is reliably made regardless of whether it is conductive or not. Since the three needles 11 to 13 are arranged in a straight line, even if the electrode holder 10 is set diagonally, the slightly floating center needle 12 will not come into contact with the floor 20.

Mat 2 laid on the surface of the car floor 20
1, the needles 11 to 13 are inserted into the mat 21 as shown in FIG. Even if it cannot be confirmed whether the floor 20 is conductive or not, it is possible to detect moisture intrusion into the back surface of the mat 21 with high reliability because the needle 12 is floating from the floor 20 on the back surface.

In the embodiment described above, the needle 13 may be used as a mere guide, and the battery 16 may be used to supply power only between the other needles 11 and 12. It is also possible to supply power to the electrodes from a constant current source. In addition, as shown in Figure 3, the resistance value judgment circuit is used only when the measured resistance value is between the upper and lower resistance limits, which can be set arbitrarily according to the material of the measuring part, surrounding conditions, etc. It is also conceivable to configure it as a comparison circuit that generates an output signal. According to this circuit, for example, when conductive silicone grease is present in the measurement part, it is possible to prevent a decrease in detection accuracy caused by a decrease in resistance value despite the absence of moisture.

[Effect of idea]

As described above, according to the present invention, even if the test portion of the floor is conductive, the presence or absence of moisture can be detected by reliably setting the electrode. Furthermore, even on floors where the tips of the electrode needles are covered with pine or the like and are difficult to see, moisture can be detected with high reliability by reliably avoiding the low resistance caused by the presence of conductors. It is particularly effective as a rain leak test device for automobiles.

[Brief explanation of the drawing]

Fig. 1a is a block diagram of a floor moisture detection device according to an embodiment of the present invention, Fig. 1b is a bottom view of its three needles, Fig. 2 is a diagram showing its usage state, and Fig. 3 is separate. FIG. 2 is a circuit configuration diagram of main parts according to an embodiment of the present invention. 11-13...needle, 20...floor, 21...
Matsuto.

Claims (1)

[Claims for Utility Model Registration] A resistance measurement circuit that supplies power between electrodes located in a moisture test area and measures the resistance between them, and outputs an output when the measured resistance falls below a predetermined level. In a floor moisture detection device comprising a resistance value determination circuit that generates a signal and an alarm that responds to the output signal, the electrodes are arranged substantially in a straight line and can be inserted through a mat installed on the floor. Consisting of two needles, the tip of the center needle is retracted more than the tips of the other needles, and the center needle and the other two needles are
A floor moisture detection device characterized in that power is supplied between at least one of the needles of a book.