JP2012002697A - Acoustic leak position detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily diagnose whether a microphone (sound wave detector) is normal before leak position detecting operation, and to efficiently carry on the leak position detecting operation.SOLUTION: An acoustic leak position detection device 1 includes a first connection portion 10 connected to an opening end L1 on one end side of a set detection section L of piping P, and a second connection portion 20 connected to an opening end L2 on the other side, wherein a first sound wave detector 11 and a first sound wave generator 12 are arranged at the first connection portion 10, and a second sound wave detector 21 and a second sound wave generator 22 are arranged at the second connection portion 20. The acoustic leak position detection device 1 further includes a signal processing portion 30 for inputting detection signals of first and second sound wave detectors 11, 22 and outputting operation signals of first and second sound wave generators 12, 22. The signal processing portion 30 has leak position detection means 31, first sound wave detector diagnostic means 32, and second sound wave detector diagnostic means 33.

Description

  The present invention relates to a sound wave type leak position detection device that detects a leak position of a pipe by detecting a leak sound.

  FIG. 1 is an explanatory view showing a conventional sonic leakage position detection device (see Patent Document 1 below). Pipes for transporting fluids such as gas and water may be punctured due to corrosion or damage, and the transport fluid may leak. In response to this, it is required to detect the leaked portion and promptly repair the leaked portion. The acoustic leak detection device J0 can be applied to pipes in various laying states, but is particularly effective for detecting the leak position of underground pipes.

  This sound wave type leak position detection device J0 attaches a microphone J2 and a microphone J3 as a sound wave detector to a standing pipe branched from two arbitrary points (points A and B) on the pipe P, and these microphones J2 and J3 A leakage sound emitted from the leakage position at point C is detected. Then, the sound wave signal detected by the microphone J2 and the sound wave signal detected by the microphone J3 are processed by the cross-correlation method by the arithmetic processing unit J1, so that a leaked sound emitted from the point C at a certain point in time is detected as the points A and B. A difference in propagation time transmitted to two points is obtained, and a distance from an intermediate point (point D) between point A and point B to point C as a leakage position is obtained based on the difference in propagation time.

JP-A-5-87669

  In such a sound wave type leakage position detection device, there is a problem that when there is no microphone output, it is impossible to distinguish whether there is no leakage sound or whether there is any output due to a malfunction or poor connection of the microphone. there were. In practice, a confirmation sound is generated by an operator uttering a voice or hitting a vertical tube, and the detection work is performed after diagnosing a malfunction of the microphone based on whether the confirmation sound can be detected. However, according to this, when performing leak position detection work continuously in multiple sections, a confirmation sound is generated each time the installation location of the microphone is changed, and it is necessary to check whether there is a connection failure or the like. There was a problem that the work could not be performed efficiently.

  In addition, the middle of the leak detection section in the pipe may be blocked by earth or sand or water, etc. In this case, if the pipe is plugged in one place of the leak detection section, it is Since the leakage sound can be detected with one of the pair of microphones installed, it is possible to grasp the situation where the piping is blocked. However, when the piping is blocked at multiple locations so that the leakage location is sandwiched, there is a problem that it is not possible to distinguish whether the piping is closed and the leakage noise is turned off or no leakage noise is generated. It was.

  This invention makes it an example of a subject to cope with such a problem. That is, it is possible to easily diagnose whether or not the microphone (sound wave detector) is normal before the leak position detection work, the leak position detection work can be advanced efficiently, and the middle of the piping is blocked It is an object of the present invention to be able to recognize before leakage position detection work and to improve the reliability of the leakage position detection work.

  In order to achieve such an object, a sonic leakage position detection apparatus according to the present invention comprises at least the following configuration.

  A sound wave type leak position detection device for detecting a leak position of a pipe by detecting a leak sound, wherein the first connection portion connected to an opening end on one end side of a set detection section in the pipe and the other of the detection section A second connection portion connected to the opening end on the side, and the first connection portion is disposed in the vicinity of the first sound wave detector and the first sound wave detector for detecting the sound wave propagating through the pipe. A first sound wave generator for generating sound waves is disposed, and the second connection portion is disposed near the second sound wave detector and a second sound wave detector for detecting sound waves propagating through the pipe. A second sound wave generator for generating sound waves; a signal processing unit for receiving detection signals of the first and second sound wave detectors and outputting operation signals of the first and second sound wave generators; And the signal processing unit detects the first sound wave detector. A leak position detecting means for detecting a leak position in the detection section based on a signal and a detection signal of the second sound wave detector, and detection of the first sound wave detector according to an operation signal output of the first sound wave generator First sound detector diagnostic means for diagnosing whether the first sound wave detector is normal or abnormal by checking a signal, and detection of the second sound wave detector according to the operation signal output of the second sound wave generator A sound wave type leakage position detection device comprising: a second sound wave detector diagnosis means for diagnosing whether the second sound wave detector is normal or abnormal by checking a signal.

  The present invention has such a feature, and in the sound wave type leakage position detection device that detects the leakage position of the pipe by detecting the leakage sound, one or both of the first sound wave detector and the second sound wave detector are normal. It is possible to easily diagnose whether or not the leak position is detected before the leak position is detected, and the leak position is detected efficiently.

  In addition, the signal processing unit confirms the detection signal of the second sound wave detector according to the operation signal output of the first sound wave generator, and determines whether or not the pipe in the detection section is in the closed state. By providing the determination means, it is possible to recognize the situation where the middle of the pipe is blocked before the leakage position detection work, and it is possible to improve the reliability of the leakage position detection work.

Explanatory drawing which showed the conventional sound wave type leak position detection apparatus. Explanatory drawing which showed the sound wave type leak position detection apparatus which concerns on embodiment of this invention. Explanatory drawing which showed the other example of the sound wave type leak position detection apparatus which concerns on embodiment of this invention. Explanatory drawing which showed the structural example of the 1st, 2nd connection part in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is an explanatory view showing a sonic leak position detecting apparatus according to an embodiment of the present invention. As in the prior art, the sonic leak position detection device 1 specifies a detection section L in the pipe P, and an open end L1 of a branch pipe (meter stand pipe) P1 branched from one end (point A) of the detection section L. And a leaking sound emitted from the point C at a certain point in time at the opening end L2 of the branch pipe (meter stand pipe) P2 branched from the other end (point B) of the detection section L. A difference in propagation time transmitted to a point is obtained, and a distance from an intermediate point (point D) between point A and point B to point C, which is a leakage position, is obtained based on the difference in propagation time.

  The sound wave type leak position detection apparatus 1 according to the embodiment of the present invention includes a first connection portion 10 connected to an opening end L1 on one end side of a set detection section L in the pipe P and an opening on the other side of the detection section L. In addition to the second connection unit 20 connected to the end L2, the signal processing unit 30 is provided.

  The first connection unit 10 includes a first sound wave detector (microphone) 11 that detects sound waves propagating in the pipe P, and a first sound wave generator (microphone) that is disposed in the vicinity of the first sound wave detector 11 and generates sound waves. (Speaker) 12 is provided, and a second sound wave detector (microphone) 21 that detects sound waves propagating in the pipe P is disposed in the second connection portion 20 and is disposed in the vicinity of the second sound wave detector 21 to generate sound waves. A second sound wave generator (speaker) 22 is disposed.

  The signal processing unit 30 receives detection signals from the first sound wave detector 11 and the second sound wave detector 21 and outputs operation signals from the first sound wave generator 12 and the second sound wave generator 22. The first connection unit 10 and the second connection unit 20 are connected by a wired or wireless signal line.

  The signal processing unit 30 is a basic function as the sound wave type leakage position detection device 1, and leaks in the detection section L based on the detection signal of the first sound wave detector 11 and the detection signal of the second sound wave detector 21. Leakage position detecting means 31 for detecting the position is provided. The leakage position detection means 31 processes the detection signal of the first sound wave detector 11 and the detection signal of the second sound wave detector 21 by the cross-correlation method, so that the leaked sound generated at a certain time is point A. (Or the opening end L1) and the difference in propagation time until reaching the point B (or opening end L2), and the leakage position (point C) is an intermediate position (point D) based on the difference in propagation time. ) Has a function of detecting how far away it is.

  The signal processing unit 30 in the sound wave type leakage position detection device 1 according to the embodiment of the present invention includes a first sound wave detector diagnosis unit 32 and a second sound wave detector diagnosis unit in addition to the leakage position detection unit 31 described above. 33 at least.

  The first sound wave detector diagnosis means 32 diagnoses whether the first sound wave detector 11 is normal or abnormal by confirming the detection signal of the first sound wave detector 11 in accordance with the operation signal output of the first sound wave generator 12. The second sound wave detector diagnosing means 33 confirms the detection signal of the second sound wave detector 21 in accordance with the operation signal output of the second sound wave generator 22 to thereby detect the second sound wave detector. It has a function of diagnosing whether 21 is normal or abnormal.

  That is, the first and second sound wave detector diagnosis units 32 and 33 generate sound waves from the first and second sound wave generators 12 and 22, and the sound waves are generated by the first and second sound wave detectors 11 and 21, respectively. By detecting whether or not the first and second sound wave detectors 11 and 21 are operating normally, sound waves are generated from the first and second sound wave generators 12 and 22. Nevertheless, if no sound wave detection signal is obtained from the first and second sound wave detectors 11 and 12, the first and second sound wave detectors 11 and 12 are diagnosed as abnormal.

  The first sound wave detector diagnosis means 32 and the second sound wave detector diagnosis means 33 can individually diagnose the first sound wave detector 11 and the second sound wave detector 21 by functioning individually. The sound wave detector diagnosis means 32 and the second sound wave detector diagnosis means 33 are caused to function simultaneously, and an abnormality output is generated when either the first sound wave detector 11 or the second sound wave detector 21 is diagnosed as abnormal. You may make it make it.

  It is effective to execute the first and second sound wave detector diagnosis units 32 and 33 before the leakage position detection unit 31 is executed, and particularly when the operation of the signal processing unit 30 is started (for example, when the power is turned on). By executing, automatic diagnosis of the first and second sound wave detectors 11 and 21 becomes possible.

  In the sound wave type leakage position detection apparatus 1 according to the embodiment of the present invention, the signal processing unit 30 may include a sound wave detector abnormality display unit 34 in addition to the first and second sound wave detector diagnosis units 32 and 33. it can. The sonic detector abnormality display means 34 displays an abnormality when one or both of the first sonic detector diagnosis means 32 and the second sonic detector diagnosis means 33 diagnose an abnormality. The abnormality display is performed by driving a display unit (not shown) provided in the sonic leakage position detection device 1 by an output from the signal processing unit 30, so that the operator can display an abnormality such as a character display such as “microphone abnormality” or a red dot display. Make a recognizable display.

  FIG. 3 is an explanatory view showing another example of the sound wave type leakage position detection apparatus according to the embodiment of the present invention. In this example, the signal processing unit 30 of the sonic leakage position detection device 1 is configured such that the leakage position detection means 31, the first sonic detector diagnosis means 32, the second sonic detector diagnosis means 33, and the sonic detector abnormality display means described above. In addition to 34, a pipe blockage determining means 35 and a detection section pipe length measuring means 36 are provided. Both the pipe blockage determination means 35 and the detection section pipe length measurement means 36 may be provided, but either one may be omitted.

  The pipe blockage determination means 35 confirms the detection signal of the second sound wave detector 21 (or the first sound wave detector 11) according to the operation signal output of the first sound wave generator 12 (or the second sound wave generator 22). Thus, it has a function of determining whether or not the pipe P in the detection section L is in a closed state. That is, whether or not the pipe P in the detection section L is in a closed state depending on whether or not the sound waves can be detected on the other end side of the detection section L by releasing sound waves from the one end side of the detection section L into the pipe P. Is determined. If the pipe blockage determining means 35 is executed to determine whether or not the pipe P in the detection section L is in the closed state, if there is no sound wave detection in the leak position detecting means 31, there is no leakage. It is possible to distinguish whether sound waves are not detected due to blockage of the pipe P. This distinction is based on the assumption that the first and second sound wave detectors 11 and 21 are operating normally.

  The detection section pipe length measuring means 36 detects the detection signal of the first sound wave detector 11 and the detection signal of the second sound wave detector 21 according to the operation signal output of the first sound wave generator 12 (or the second sound wave generator 22). Are compared, and the pipe length of the detection section L is measured. The pipe length of the detection section L can be roughly grasped from the piping diagram, but it is difficult to grasp the accurate pipe length when the pipe is complicatedly bent. In such a case, an accurate pipe length is measured by the detection section pipe length measuring means 36 and the intermediate position (point D) of the detection section L is accurately grasped. The sound wave generated by the first sound wave generator 12 is detected by the first sound wave detector 11 and detected by the second sound wave detector 21, and the sound wave is detected by the first sound wave detector 11 and then the second sound wave detector 21. The length of the detection section L is measured based on the arrival time difference until it is detected by. The pipe length measured here includes the lengths of the branch pipes P1 and P2. If the pipe lengths of the branch pipes P1 and P2 are known, the pipe length of the detection section L is obtained by subtracting this. Can do.

  FIG. 4 is an explanatory diagram showing a configuration example of the first and second connection portions in the embodiment of the present invention. The first connection unit 10 (or the second connection unit 20) includes a first sound wave detector 11 (or a second sound wave detector 21) and a first sound wave generator 12 (or a second sound wave generator 22). However, by connecting the first sound wave generator 12 to the line of the first sound wave detector 11 via the resonance circuit 13, the line of the first sound wave detector 11 and the second sound wave generator 12 can be shared. it can. With such a configuration, the complexity of line connection can be avoided and the occurrence of poor connection can be suppressed.

  As described above, the sound wave leakage position detection apparatus 1 according to the embodiment of the present invention includes a sound wave detector (microphone) and a sound wave generator (speaker) as a set, and both end openings L1, L2 of the detection section L. Leakage position detection with sound wave detector (microphone) diagnosis function, sound wave detector abnormality display function, judgment function of whether the pipe is blocked, and detection section pipe length measurement function In addition to functions.

  The sound wave leakage position detection apparatus 1 according to the embodiment of the present invention having such a function has a first sound wave detector 11 and a second sound wave detector in addition to the basic function of detecting the leakage position of the pipe P by detecting the leakage sound. Whether or not one or both of the sound wave detectors 21 are normal can be easily diagnosed before the leakage position detection work, and the leakage position detection work can be efficiently advanced.

  In addition, since the sonic leakage position detection device 1 has a determination function for determining the closed state of the pipe P, it is possible to recognize the situation where the pipe P is blocked in the middle before the leak position detection work, and the leak position detection work Reliability can be improved. The sonic leak position detection device 1 includes the detection section pipe length measurement function, so that the leak position can be accurately detected based on the accurate detection section pipe length.

  That is, the sound wave type leak position detection apparatus 1 of the present invention includes a sound wave detector (microphone) and a sound wave generator (speaker) as a set and is attached to both end openings L1 and L2 of the detection section L, respectively. In addition to the means 31, the first sound wave detector diagnosis means 32, the second sound wave detector diagnosis means 33, the sound wave detector abnormality display means 34, the pipe blockage determination means 35, and the detection section pipe length measurement means 36 are provided. In addition, the work efficiency and work accuracy of leak position detection can be improved.

1: Sonic leak detection device,
10: 1st connection part, 20: 2nd connection part,
11: first sound wave detector, 12: first sound wave generator,
21: second sound wave detector, 22: second sound wave generator,
30: signal processing unit,
31: Leakage position detection means,
32: First sound wave detector diagnostic means,
33: Second sound wave detector diagnostic means,
34: Sound wave detector abnormality display means,
35: Pipe blockage determining means,
36: Detection section pipe length measuring means,
P: Piping, L: Detection section, L1, L2: Open end

Claims (5)

A sound wave type leakage position detection device that detects a leakage position of a pipe by detecting a leakage sound,
A first connection portion connected to an opening end on one end side of the set detection section in the pipe and a second connection portion connected to an opening end on the other side of the detection section;
The first connection portion is provided with a first sound wave detector that detects a sound wave propagating through the pipe and a first sound wave generator that is disposed in the vicinity of the first sound wave detector and generates a sound wave,
A second sound wave detector that detects a sound wave propagating through the pipe and a second sound wave generator that is disposed in the vicinity of the second sound wave detector and generates a sound wave are disposed in the second connection part,
A signal processing unit that receives detection signals of the first and second sound wave detectors and outputs operation signals of the first and second sound wave generators;
The signal processing unit
Leak position detection means for detecting a leak position in the detection section based on the detection signal of the first sound wave detector and the detection signal of the second sound wave detector;
First sound wave detector diagnostic means for diagnosing whether the first sound wave detector is normal or abnormal by checking a detection signal of the first sound wave detector according to an operation signal output of the first sound wave generator;
Second sound detector diagnosis means for diagnosing whether the second sound detector is normal or abnormal by confirming a detection signal of the second sound detector according to an operation signal output of the second sound generator; A sound wave type leakage position detection apparatus comprising: The signal processing unit
The sound wave detector abnormality display means for displaying an abnormality when one or both of the first sound wave detector diagnosis means and the second sound wave detector diagnosis means diagnose abnormality is provided. Sonic leak detection device. The signal processing unit
A pipe blockage determining means for determining whether or not the pipe in the detection section is closed by checking a detection signal of the second sound wave detector according to an operation signal output of the first sound wave generator; The sound wave type leak position detecting apparatus according to claim 1 or 2, further comprising: The signal processing unit
A detection section pipe for measuring the pipe length of the detection section by comparing the detection signal of the first sound wave detector and the detection signal of the second sound wave detector according to the operation signal output of the first sound wave generator. The sonic leak position detecting device according to claim 1, further comprising a length measuring unit.   2. The sonic leak position detection apparatus according to claim 1, wherein the first sound wave detector diagnosis unit and the second sound wave detector diagnosis unit are executed at the start of operation of the signal processing unit.

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