JP2543436Y2 - Liquid leak detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a liquid leak detector for detecting a leak of a conductive liquid such as a water leak in a beverage vending machine or a basement.

(B) Prior Art Inundation of beverage vending machines, basements and underpasses, etc., causes damage to the machine and various damages. Therefore, it is necessary to quickly detect such damage and stop the liquid leakage that causes the damage. For this reason, various types of detection elements and detection devices for detecting a liquid leak at an early stage have been proposed (JP-A-60-218196, JP-B-62-45388, etc.).

(C) Problems to be Solved by the Invention However, in the above-described conventional liquid leakage detection device, since the detection element is installed on the bottom surface of the device to be detected (vending machine), water droplets or slight moisture spilled by mistake are spilled. May be detected even if it is only on the bottom of the device, causing a malfunction. In addition, since the sensing element is formed of a linear body covered with a mesh-shaped insulating material, once it comes into contact with moisture, it takes time to dry, and a liquid containing sugar is consumed by a beverage vending machine. When leaked, there is a disadvantage that the sugar cannot be reused because the sugar is soaked in the gaps of the mesh and dried.

It is an object of the present invention to solve the above-described problem by providing a liquid leakage detector that can adjust a detection level by using an electrode as a detection unit and adjusting the height of the electrode.

(D) Means for Solving the Problems This invention comprises a support molded in a flat shape and having a cutout on the bottom surface, and a pair of electrodes fixedly supported in parallel in the cutout by the support. A resistor built in and fixed to the support, connected between the pair of electrodes, and having a resistance value sufficiently larger than a resistance value between the electrodes at the time of conduction due to liquid leakage, and at least three corners of the bottom surface of the support And a height adjustment screw projecting from the bottom surface when rotated, and a lead wire connected to the pair of electrodes is taken out from the side surface of the support.

(E) Operation The liquid leakage detector of the present invention has a structure in which the electrode is supported in the cutout on the bottom surface by the support formed by molding.
Electrodes are exposed on the bottom. Therefore, it is possible to detect the liquid leaking to the floor. In addition, since the electrodes are fixedly supported by the molded support and the resistors are fixed inside the support, the electrodes and the resistors are completely fixed by molding, thereby improving mechanical reliability. improves.

Further, the liquid leakage detector is very stable at the time of installation because the molding-formed support is formed in a flat shape. In addition, by arranging high adjusting screws at least at three corners of the bottom surface, the surface can be determined and stabilized by three or more contact points, and it is very stable even when the height is adjusted. In addition, by adjusting the height of each height adjustment screw on any installation surface such as an uneven surface, three or more contact points can be secured, so that stable installation is possible. Further, since the lead wire is drawn out from the side surface of the support, the detector does not fall over due to the weight of the lead wire, and is stable.

(F) Embodiment FIGS. 1 and 2 are views showing the appearance of a liquid leakage detector according to an embodiment of the present invention. The support 1 is formed by molding while holding a pair (two) of electrodes 2 (2a, 2b), and has a substantially T-shaped groove 1a, 1b on the bottom surface. The electrode 2, which is a metal piece, is placed in parallel about 1 mm above the bottom surface with the intersection of 1a and 1b interposed therebetween. The electrode 2 is provided with a hole 2a. This liquid leak detector is installed with the surface where the electrode 2 is exposed facing downward. When the water level of the water immersed by the liquid leakage or the like reaches the position of the electrode 2, conduction between the electrodes is made with a certain resistance value due to the conductivity of water or the like. This change in insulation / conduction is transmitted to the detection circuit as a liquid leakage signal. Groove 1
When there is water leakage, a and 1b promptly guide the water between the electrodes 2a and 2b to improve the detection speed, and improve the air permeability when the inundation is recovered to promote the drying of the electrodes. The hole 2a formed in the electrode 2 has the same effect. In addition, since the electrode 2 is plated with nickel, even if a juice solution containing a sugar leaks, the electrode 2 can be quickly dried and reused by washing with water.

Screw holes 1c for height adjustment are provided at the four corners of the bottom surface of the support 1.
Are formed, and two mounting screw holes 1d are formed substantially in the center. The screw hole 1c has a female screw portion, and the screw hole 1d is a vertically penetrated hole. With the height adjusting screw 4 screwed into the screw hole 1c, the distance between the installation surface of the liquid leak detector and the electrode 2 can be arbitrarily adjusted. This liquid leak detector is attached to the bottom surface of the vending machine by a screw inserted into the screw hole 1d. A lead wire 3, which is a 2-core vinyl-coated wire, is inserted from the side of the support. The two electric wires of the lead wire 3 are connected to the electrodes 2a and 2b, respectively.

By the way, the level of inundation causing an obstacle varies slightly depending on the installed device, and the degree of moisture on the bottom surface of the device also differs. For this reason, it is necessary to adjust the height of the electrode 2 so as to detect when the level of flooding needs to be dealt with. A height adjusting screw 4 is used for this adjustment.
The height adjusting screw 4 is screwed into the screw hole 1c, and when the screw is fully screwed, its head is immersed in the screw hole 1c. Height adjustment screw 4
As the screw is loosened, the head of the screw protrudes and lifts the bottom surface (electrode 2) of the support 1. Thereby, the height from the installation surface of the electrode 2 can be arbitrarily adjusted.

FIG. 3 is a diagram showing an internal configuration of the liquid leak detector. Inside the leak detector, a resistor 5 of 20 KΩ is connected to the electrode 2
It is connected by soldering between a and 2b. The resistor 5 is soldered to the electrodes 2a and 2b together with the lead wires, and then molded in the support 1.

By connecting a resistor of 20KΩ between the electrodes 2a and 2b in this way, the resistance value of this liquid leak detector is 20KΩ even without water infiltration, and it is distinguished from disconnection of lead wires etc. (resistance value infinity). be able to.

FIG. 4 is a circuit diagram of a liquid leakage detecting device using the liquid leakage detector.

The liquid leak detector 10 is connected to a rectifier circuit 13 via a lead wire 11. The voltage of the power supply 12 is divided by a voltage dividing resistor 19 and applied to the liquid leakage detector 10. Therefore, the input voltage of the rectifier circuit 13 depends on the resistance value of the leak detector 10 and the lead wire.
It decreases in proportion to the decrease of the parallel impedance with the line impedance of 11. The output voltage Vo of the rectifier circuit 13 is input to the comparison circuit 15. The comparison circuit 15 has two comparators 17 and 18 for high-voltage comparison and low-voltage comparison. The inverting input terminal of the comparator 17 for high-voltage comparison and the comparator 18 for low-voltage comparison.
Vo is input to the non-inverting input terminal of. The non-inverting input terminal of the comparator 17 and the inverting input terminal of the comparator 18 have the reference voltage V divided by the resistors R1 and R2 and the variable resistor VR, respectively.
I and V2 are input. The high-side reference voltage V1 input to the comparator 17 is normal when the leak detector 10 is normal (when the resistance value is 20 KΩ)
, And the low-voltage-side reference voltage V2 input to the comparator 18 is set lower than the normal voltage Vo of the liquid leakage detector 10. The comparison circuit 15 is connected to the alarm circuit 16. That is, the output of the comparator 17 is input to the alarm 16a, and the output of the comparator 18 is input to the alarm 16b. When the leak detector 10 is normal, both the comparisons 17 and 18 output “H”. However, when the resistance value of the leak detector 10 decreases, the output of the comparator 18 is inverted (outputs “L”). When the resistance value of the leak detector 10 increases, the output of the comparator 17 is inverted. When the signal from the comparator is inverted, the alarms 16a and 16b sound. When the contacts 2a and 2b of the leak detector 10 become conductive due to the water being leaked by the leak,
The resistance value decreases, and the divided voltage input to the rectifier circuit 13 decreases. Therefore, the output voltage Vo also decreases, and the output of the comparator 18 is inverted to output “L”. As a result, the alarm 16b sounds to warn of a leak. If the lead wire 11 breaks, the resistance between the input terminals of the rectifier circuit 13 becomes infinite and the power supply
The voltage of 12 is input as it is. As a result, the output voltage Vo
Rises, and the output of the comparator 17 is inverted to output “L”.
As a result, the alarm 16a sounds to warn of the failure of the liquid leakage detection device.

As described above, in the present invention, it is possible to detect the liquid leaking to the floor surface by exposing the electrodes to the bottom surface, and furthermore, by fixing the electrodes and the resistors in the molding-supported support, they can be detected. It is completely fixed and can improve mechanical reliability.

Further, since the molding support is formed in a flat shape, it is extremely stable when installed on the floor and does not fall down. In addition, since the height adjusting screws are provided at least at three corners, the stability is not impaired even when the height is adjusted. Furthermore, since the lead wire is pulled out from the side of the support, the detector does not become unstable due to the weight of the lead wire,
Since the leads are laid along the floor, there is the advantage of increased stability.

[Brief description of the drawings]

1 (A) and 1 (B) are side and bottom views of a liquid leak detector according to an embodiment of the present invention, FIG. 2 is a perspective view from the bottom of the liquid leak detector, and FIG. Internal configuration diagram of liquid leak detector,
FIG. 4 is a circuit diagram of a liquid leakage detection device using the liquid leakage detector. 1-support, 2-electrode, 4-height adjustment screw, 5,7-resistor, 15-comparison circuit, 16-alarm circuit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiji Hino 2-3-1 Iwatacho, Higashiosaka-shi, Osaka Tatsuta Electric Wire Co., Ltd. (72) Kunihiro Sakai 2-3-3 Iwatacho, Higashiosaka-shi, Osaka No. 1 Inside of Tatsuta Electric Wire Co., Ltd. (56) References JP-A-58-60235 (JP, U) JP-A-57-97265 (JP, U) JP-A-60-181665 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A support which is molded into a flat shape and has a cutout on a bottom surface, a pair of electrodes fixedly supported in parallel in the cutout by the support, and embedded and fixed in the support. A resistor connected between the pair of electrodes and having a resistance value sufficiently larger than the resistance value between the electrodes during conduction due to liquid leakage, disposed at least at three corners or more of the bottom surface of the support, and rotated And a height adjustment screw protruding from the bottom surface, and wherein a lead wire connected to the pair of electrodes is taken out from a side surface of the support.