JP2013024849A - High-potential water leakage search device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that, in a sound-listening type water leakage search for detecting water leakage sound leaking from a pipe, from the ground surface over a pipe, and determining the leakage area, leakage-sound propagation and listening properties are different according to the quality of a water pipe and a buried depth, and especially in a low-hydraulic pressure pipe or a pipe made of electrical insulation material, noise in a search area is added thereto and it is hard to search the water leakage.SOLUTION: A high-potential water leakage search device, by highly efficiently using the electrical insulation of an electrical insulation material: passes a DC current of a high voltage to liquid with electric fluidity in the pipe; senses the directionality of the surface electric current in the ground surface by the high voltage that flows out from a leaking area along with the liquid; and detects the leaking area in a pinpointed way.

Description

The present invention is a technical field for the purpose of searching for the presence / absence of water leakage and the location of water leakage in water supply / drainage pipes installed in the ground and structures.

This is an acoustic type that detects the leak sound from the surface of the pipe and identifies the location of the leak, and there are large differences in the propagation and hearing characteristics of the leaked water depending on the material of the distribution pipe and the depth of embedding. It is difficult to search for leaks in piping made of insulating materials.

  In the auditory search, it is difficult to search for water leaks in rural water and agricultural water where the burial depth is not constant and the leakage of water leaks is poor.

  In the auditory search, it is difficult to detect the sound of leakage due to low water pressure leakage in an electrically insulating material tube.

  In the auditory search, since a sound is heard immediately above the electrically insulating material pipe, it is necessary to search for a pipeline in advance, which is inefficient.

  In the auditory search, it is difficult to discriminate the leak sound due to the noise in the leak search area.

  The present invention makes use of the electrical insulation of the electrically insulating material pipe to flow a high-voltage direct current through an electrically conductive liquid in the pipe, and the surface layer on the ground surface due to the high voltage flowing out together with the liquid from the water leakage point. It is a means for detecting the leakage location by pinpointing the directionality of the current.

The positive high-voltage direct current generated by the “direct current high voltage generator (1)” is routed from the “high voltage injection point (3)” to the “electrically insulating material pipe (7)” via the “positive electrode cable (2)”. Then, it flows through the “metal body (6) in contact with the conductive liquid” in the tube.
The negative electrode of the “DC high-voltage generator (1)” is connected to the “earth (5)” in the direction of leak detection through the “ground cable (4)”.

The “current in the conducting liquid (8)”, which is electrically disconnected from the ground due to the insulation characteristics of the “electrically insulating material pipe (7)”, is “ground radiation current” together with the liquid leaking from the “water leakage point (9)”. (10) "is released between the ground.
The “ground radiation current (10)” forms a “surface radiation current start point (11)” on the nearest ground surface and emits a “water leakage point ground radiation current (12)” in all directions on the ground surface. Similarly, the “high pressure injection point ground radiation current (14)” is also generated from the “metal body (6) in contact with the conductive liquid” at the “high pressure injection point (3)”.

  The “surface current measuring machine (13)” is a device that measures the potential between two points on the surface of the earth. The direction and intensity of the “surface radiation current (12)” and the “high pressure injection point ground radiation current (14)” are measured.

In the vicinity of the “high pressure injection point (3)”, the “ground current measuring device (13)” detects the “high pressure injection point ground radiation current (14)” to indicate the current direction in the ground direction. The “radiated current (14)” attenuates with distance, and when it approaches the “leakage point ground radiation current start point (11)”, the “ground current measuring device (15)” reverses the “leakage point ground radiation current (12)”. As a result, the current value increases.
When the water leakage point is exceeded, “the surface current receiver indicates the ground direction (16)” and the “water leakage point surface radiation current (12)” on the ground side is detected.
The “ground current measuring device (17) indicating the center point” detects the “leakage point ground radiation current (12)” and detects the “leakage point neutral line (18)” perpendicular to the pipe.

The “surface current measuring device (19) located 90 ° to the left of the earth direction” has the “leakage point neutral line (18)” emitted from the “leakage point surface radiation current origin (11)”. 12) "is detected, and the current value increases as it approaches" leakage point ground radiation current starting point (11) ".
When the ground surface current measuring device passes through the “water leakage point ground radiation current starting point (11)” on the “water leakage point neutral line (18)”, the “surface current measuring device (20) located 90 ° to the right of the ground direction” is in the opposite direction. Current.
“The surface current measuring device (21) located in the neutral position of the water leakage point” is on the “water leakage point surface radiation current starting point (11)” indicating non-directional current in all directions, and immediately above the water leakage point. Indicates.

The “surface current measuring device (22) located at the center of the current boundary point” is the boundary between the “high pressure injection point ground radiation current (14)” and the “water leakage point ground radiation current (12)”. Can be detected.
The “surface current measuring device (24) located in the ground direction” passes through the “leakage point ground radiation current start point (11)” and the “leakage point ground radiation current (12)” attenuates and leaves the leak point. Show.

  It is possible to detect water leakage from a resin pipe with low sound transmission.

  Resin pipes with rubber ring joints with low sound transmission are also available.

  There is no need to search for pipelines in advance.

  Applicable to pipes with low water pressure and natural flow pipes.

  It can be handled regardless of the type of road surface.

  Skilled workers who can identify the leaked sound are not required.

  Unaffected by search area noise.

  Can be used for drain pipes regardless of the pipe diameter.

FIG. 1 is an explanatory diagram showing an outline of a high-potential water leakage search apparatus according to the present invention. FIG. 2 is an explanatory diagram showing the omnidirectionality of the surface radiation current in a state where the high-potential water leakage search apparatus is installed. FIG. 3 is an explanatory diagram showing the position of the ground current receiver and the direction of the ground current on the pipe.

1. DC high voltage generator Positive cable 3. 3. High pressure injection point Ground cable 5. Earth 6. 6. Metal body in contact with the conductive liquid Electrical insulating material tube 8. 8. Current direction in the fluid Water leakage point 10. 10. Leakage point ground radiation current Ground radiation current starting point 12. Leakage point surface radiation current 13. Ground current measuring machine 14. High-pressure injection point surface radiation current 15. 15. Ground current measuring machine in the direction of high voltage generator 18. Ground current measuring machine indicating the earth direction Surface current measuring machine located at neutral point of water leak 18. Leakage point neutral line 19. 21. Ground current measuring machine located 90 ° left of earth direction 21. Radiated current located 90 ° to the right of the earth direction 21. A surface current measuring machine located in the neutral position of the water leakage point. Surface current measuring machine located at the center of the current boundary point 23. Boundary line 24. Ground current measuring machine located in the earth direction

Claims (1)

  Leakage that detects the location of a leak by sensing the direction of the surface current on the surface due to the high voltage that flows through the piping with a high-voltage direct current flowing through the pipe in a search for leaks in water pipes, etc. of electrically insulating materials Search device.

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