JPH07294367A - Method for detecting water leakage - Google Patents

Abstract

PURPOSE:To prevent failure of facilities in a drain machine ground and maintain the function thereof. CONSTITUTION:A water-absorbing coating material 6 for changing conductivity by absorbing water and a conductive coating material 7 are applied to the outer circumferential face 1a of a pump 1 in the form of a layer. Electric conductivity between the pump 1 and the conductive coating material 7 is measured. Since change of the conductivity of the water-absorbing coating material 6 produced in an occurrence spot of water leakage at the time of the occurrence of the water leakage can be detected through the change of the electric conductivity between the pump 1 and the conductive coating material 7, the water leakage can be detected easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water leak detecting method for detecting a water leak on a wall surface to be treated such as a pipe in a drainage pump station.

[0002]

2. Description of the Related Art A drainage pump station is provided in preparation for an emergency such as a flood, and facilities such as tanks and pipes in the drainage pump station must be maintained so that it can be operated immediately. However, in recent years, daily management is often insufficient due to lack of human resources, etc., and in the future, there is a tendency toward unmanned operation, so it is expected that an abnormality in equipment will be noticed only after operation. In order to avoid such a situation, the conventional technique attempts to detect an abnormality with a sensor such as a pressure switch or a temperature switch.

[0003]

However, in the above-mentioned equipment such as tanks and piping, slight water leakage may occur due to factors such as gradual loosening of bolts due to vibration, cracks and corrosion. However, it is difficult to detect such a slight abnormality with a conventional sensor. Therefore, there is a problem that the water leakage part is left unrepaired and may lead to equipment failure.

The present invention solves the above-mentioned problems, and makes it possible to easily detect a slight water leak that cannot be detected by conventional methods, prevent equipment failures, and maintain the function of a drainage pump station. The purpose is to do.

[0005]

In order to solve the above problems, a water leak detecting method of the present invention is a water leak detecting method for detecting a water leak occurring on a wall surface to be treated such as piping.
On the wall surface, a water-absorbing coating material whose conductivity changes by absorbing water is applied, and a conductive coating material is applied on the outer peripheral side of the water-absorbing coating material, and the wall surface and the conductivity Water leakage is detected by measuring the electrical conductivity with the coating material and detecting the change in the electrical conductivity of the water-absorbing coating material at the location where the water leakage occurs when the water leakage occurs.

[0006]

With the above structure, when water leaks on the wall surface to be treated such as piping, the leaked water is absorbed by the water-absorbent coating material on the wall surface, and the conductivity of the water-absorbent coating material at the location where the water is absorbed is reduced. As a result of the change, the electrical conductivity between the wall surface on which the water-absorbing coating material is interposed and the conductive coating material changes. Therefore, the water leakage can be detected by detecting the change in the conductivity between the wall surface and the conductive coating material.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows a pump (vertical axial flow pump) provided in a drainage pump station, 1 is a pump casing provided with a suction pipe 2 and a discharge pipe 3, and WL is a water surface in a water tank 4. Inside the pump casing 1, an impeller is provided which is attached to a main shaft 5 extending to the outside of the casing 1 (not shown), and a motor (not shown) arranged outside the casing 1 causes the main shaft 5 to pass through. By rotating the impeller in water, the water in the water tank 4 is sucked through the suction pipe 2 and discharged through the discharge pipe 3.

As shown in FIG. 2, a water-absorptive coating material 6 whose conductivity changes by absorbing water is applied to a portion of the outer peripheral surface 1a of the pump casing 1 above the water surface WL. A conductive coating material 7 is applied to the outer peripheral side of the water absorbing coating material 6. Then, the water surface W. on the outer peripheral surface 1a of the pump casing 1.
Point A above L., ie, water-absorbent coating material 6
And the point where the conductive coating material 7 is applied and the water surface
A conductivity measuring means 8 is provided in connection with a point B below WL, that is, a point where the water absorbing coating material 6 or the conductive coating material 7 is not applied. Therefore, when the conductivity between the points A and B is measured, the conductivity between the pump casing 1 and the conductive coating material 7 is measured with the water-absorbing coating material 6 interposed. Become. The electric conductivity measuring means 8 is connected to an alarm generating means (not shown) for issuing an alarm when the electric conductivity changes.

The operation of the above structure will be described below.
The conductivity between the points A and B described above is measured by the conductivity measuring means 8
Is measured at all times or at an appropriate time, and the conductivity at this time is compared with the conductivity before that. Then, when there is no water leakage in the pump casing 1, the conductivity of the water-absorbent coating material 6 does not change, so the conductivity between points A and B becomes almost the same as before. .

On the other hand, as shown in FIG. 3, when the pump casing 1 is cracked 9 and water leaks from the crack 9, the leaked water is the water on the outer peripheral surface 1 a of the casing 1. Absorbed by the absorbent coating material 6,
Since the conductivity of the water-absorbent coating material 6 changes in the area where water is absorbed, the conductivity between the points A and B is different from that before it. At the time when this change in conductivity is detected, an alarm is issued by an alarm generation means (not shown).

In this way, it is possible to easily detect water leaks that could not be detected in the past, so that it is possible to take immediate action, prevent fatal equipment failure, and maintain the function of the drainage pump station. be able to.

[0012]

As described above, according to the present invention, the wall surface to be treated such as the pipe is coated with the water-absorbing coating material and the conductive coating material, whose conductivity changes by absorbing water, in a layered manner. Since the change in conductivity of the water-absorbent coating material is detected as an electric signal through the change in conductivity between the wall surface and the conductive coating material, it cannot be detected in the past. Water leakage can be easily detected. As a result, it becomes possible to take immediate action, and it is possible to maintain the equipment such as tanks and pipes in the drainage pump station in an immediately operable state.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a pump of an embodiment in which a water leak detection method of the present invention is performed.

FIG. 2 is an explanatory diagram showing coating in the pump of FIG.

FIG. 3 is an explanatory diagram showing the occurrence of cracks in the pump of FIG.

[Explanation of symbols]

 1 Pump 1a Outer peripheral surface 6 Water absorbing coating material 7 Conductive coating material

Claims (1)

[Claims] 1. A water leak detection method for detecting a water leak that has occurred on a wall surface to be treated such as piping, wherein a water absorbing coating material whose conductivity changes by absorbing water is applied to the wall surface. Along with, a conductive coating material is applied to the outer peripheral side of this water-absorbing coating material, and the conductivity between the wall surface and the conductive coating material is measured,
A water leak detection method for detecting a water leak by detecting a change in conductivity of the water-absorbent coating material at a location where the water leak occurs.