JPH0526400A - Conduit monitoring device - Google Patents

Abstract

PURPOSE:To check water leakage in distributing water conduit zones without hands. CONSTITUTION:Water leakage detecting sensors 14 are mounted on distributing water pipes 15a located at predetermined intervals on a distributing water conduit for back filling. Boxes 16 are buried in around earth surface at the vicinity of the water leakage detecting sensors. A preamiplifier 17 for amplifying the output of each water leakage detecting sensor 14 is provided in each box. An automatic transmitter 18 is provided in one box 16a out of one box group comprising a plurality of the boxes 16 and is connected to the preamplifiers 17 in a plurality of the boxes 16, 16a. And the preamplifiers are composed to allow connection to a telephone circuit 13. In addition, the preamplifiers are composed to allow connection to a water leakage detector main body 11 through the telephone circuit 13 so that the water leakage location of the distributing water conduit may be detected based on a signal from each water leakage detecting sensor 14 by the water leakage detector main body 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipeline monitoring device for monitoring water leakage in a distribution pipeline.

[0002]

2. Description of the Related Art At present, a portable type correlative leak detection device is already in practical use. As shown in FIG. 2, the correlation-type leak detection device includes a leak detector main body 1 and an antenna 2
And preamplifier 3 and pickup (leakage detection sensor) 4
The pickup 4 is set on the existing valve, digestive tap, etc. using a magnet, the preamplifier 3 transmits the output of the pickup 4 using UHF band radio, and the detector body 1 sends the signal. It receives through the antenna 2 and detects the water leak location in the predetermined section based on the water leak sound from the pickups 4 arranged at both ends of the predetermined section. Then, the water leak detection work is performed for each section, and when the work is completed, the pickup 4 is sequentially moved to perform the detection work for the next section.

The discovery of a water leak location using this is performed as follows. In FIG. 2, the distance between the two points A and B where the pickup 4 is installed is D, the distance from the point B to the leak point C is L, and the delay time of the peak point of the leak pipe measured at the points A and B is Td. When this delay time Td is multiplied by the speed of sound V propagating in the water pipe, the distance N shown in FIG. 2 is obtained, and the value obtained by subtracting N from the distance D between points A and B and dividing by 2 is the leak point C. The distance L becomes and the following equation is obtained.

[0004]

[Equation 1]

Here, since the velocity V at which the sound of water leakage propagates to the pipe differs depending on the pipe type and pipe diameter, the sound velocity logical value is corrected in advance from the result of the experiment and set in the detector body. Therefore, when the pipe type and pipe diameter are entered, the built-in computer automatically calculates and by inputting the distance between two points, the distance from the pickup to the leak point is obtained and displayed on the screen.

[0006]

As described above, in the case of detecting water leakage with the conventional water leakage detection device, the worker sets the pickup 4 on the existing valve, digestion tap, etc., and picks up the pickup 4 for each section. Had to be moved, which was laborious and time consuming.

The present invention solves the above-mentioned problems, and it is possible to check leakage of water in a distribution pipeline section in a short time without manpower, and therefore, from the viewpoint of personnel in the maintenance work of water pipelines at present. Also, it is an object of the present invention to provide a pipeline monitoring device that can significantly streamline the leak detection work, which occupies a considerable proportion in terms of cost.

[0008]

In order to solve the above-mentioned problems, in the pipeline monitoring device of the present invention, a leak detection sensor is attached and embedded in the distribution pipes at predetermined intervals of the distribution pipe,
Furthermore, a box containing a preamplifier that amplifies the output of the water leak detection sensor is buried near the surface of the earth, and an automatic transmission device is attached to one box of a group consisting of a plurality of these boxes. The output of each preamplifier is configured to be output to the telephone line, and the output of the automatic transmission device received via this telephone line is used in the water distribution pipeline by the leak detection device provided on the base side. It is designed so that the location of water leakage can be detected.

[0009]

With the above structure, since the automatic transmission device mounted in one box of the group of boxes composed of a plurality of boxes sends the outputs of the plurality of water leak detection sensors to the water leak detection device through the telephone line, the human hand One operator can check for water leaks in a wide range of pipes in a short time without spending time, and it is possible to greatly rationalize the water leak detection work, which occupies a considerable weight in terms of personnel and cost. Moreover, it is possible to constantly monitor the water leakage, and it is possible to easily detect the water leakage from the initial stage.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the overall configuration of a pipeline monitoring device according to an embodiment of the present invention. In FIG. 1, 11 is a main body of the leak detector installed on the base side such as a water purification plant or a water distribution office, and 12
Is an automatic transmitter on the base side connected to the water leak detector main body 11, and connects the water leak detector main body 11 to the telephone line 13. 14
Is a water leak detection sensor attached to the water distribution pipes 15a at predetermined intervals of the water distribution pipes 15 constituting the water distribution pipe line, and is backfilled together with the water distribution pipes 15 and 15a at the time of piping. Reference numeral 16 is a box that is buried near the ground near the water leak detection sensor 14, and has a preamplifier 17 that is connected to the water leak detection sensor 14 and amplifies the sensor output inside.

A plurality of these box bodies 16 constitutes one group, and one box body 16a among them constitutes an automatic transmission device on the measurement side.
18 are attached to each of the boxes 16 and 16 in the above group.
The automatic transmission device 12 on the base side is connected to the preamplifier 17 housed in a and to the telephone line 13.
Alternatively, it can be connected to the water leak detector main body 11 by an instruction from the automatic transmitter 18 on the measurement side.

Next, the operation of the above configuration will be described. Each water leak detection sensor 14 detects the water leak sound in each section and outputs it to the automatic transmission device 18 via each preamplifier 17. When the water leak detector main body 11 is connected via the telephone line 13, the automatic transmission device 18 sends the signal of the water leak detection sensor 14 to the water leak detector main body 11 through the automatic transmission device 12. The water leak detector main body 11 detects a water leak location by the same method as the conventional method. Therefore, it is possible for one operator to check the water leakage for a short time without manpower, and it is possible to detect the water leakage from the initial stage by constantly monitoring.

The automatic transmitter 18 on the measuring side is a box 16a.
May be installed at all times, or may be detachable so that it can be attached at a proper time.

[0014]

As described above, according to the present invention, it is possible to check leakage of water in a water distribution line in a short time without manpower, and it takes a considerable weight in terms of personnel and cost. It can greatly streamline leak detection work. Further, by constantly monitoring the water leakage, there is an advantage that it can be easily detected even from a minute water leakage at the initial stage of the water leakage.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a pipeline monitoring device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an overall configuration of an example of a conventional water leak detection device.

[Explanation of symbols]

 11 Main body of leak detector 12 Automatic transmitter on the base side 13 Telephone line 14 Leak detection sensor 16, 16a Box 17 Preamplifier 18 Automatic transmitter on measurement side

Claims (1)

Claims: 1. A water leak detection sensor attached to a water pipe at a predetermined interval of a water pipe and a water leak detection sensor which is housed in a box buried in the ground and amplifies the output of the water leak detection sensor. A preamplifier and an automatic transmission device that is mounted in one box of a box group consisting of a plurality of boxes, receives the output of each preamplifier of the box group, and outputs to the telephone line,
A pipeline monitoring device comprising: a leak detection device that receives the output of the automatic transmission device through a telephone line and detects a leak location in the distribution pipe from the signal.