JPH07146218A - Method and apparatus for detecting attribute of pipe system of city gas - Google Patents

Abstract

PURPOSE:To provide a method for detecting attribute of a city gas pipe system and an apparatus for executing the same in which attribute of a tube can be accurately identified with high operability. CONSTITUTION:The method for detecting attribute of a pipe system of city gas comprises the steps of feeding arbitrary reference sound wave as a detection reference from outside into city gas pipes continuously connected, detecting sound wave vibration propagated through the gas pipe at the pipe to be identified by a vibration pickup 8 from surfaces of gas meters 1-4, converting vibration data detected by the pickup 8 into a waveform to display it on a display unit of a sound wave detector 9, judging presence or absence of sound wave vibration detection corresponding to the reference wave based on its display, and identifying whether the pipe to be identified belongs to a pipe system in which the reference wave is fed or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for investigating an attribute of a piping system installed in a city gas pipe.

[0002]

2. Description of the Related Art Conventionally, as a method of identifying an attribute of a piping system in a city gas piping, a reference sound is made to flow into the piping, and then a second phase having a phase opposite to that of the reference sound at a required place of the piping is used.
Sound is detected, the sound inside the pipe is detected at a necessary detection point, and the detected sound is used to identify which side of the point where the second sound has flowed in (Japanese Patent Publication No. 4-63).
No. 333), a continuous reference sound is introduced into the pipe, and then the reference sound is continuously taken out by a microphone for a predetermined time at a place where the pipe is used, and the reference sound is delayed by a predetermined time.
And the phase and level are adjusted so as to be the same level in antiphase with the reference sound, and this is introduced as a second sound into the upstream pipe in the vicinity of the reference sound extraction point, and at the required detection point. There is a method of detecting the sound in the pipe and discriminating to which side of the place where the second sound has flown in the detected position based on the state of the detected sound (see Japanese Patent Publication No. 4-63334). In these methods, the sound in the pipe is picked up with a microphone at the detection point and the sound pressure is checked with an oscilloscope, or a person directly hears it and identifies it.

[0003]

In any of the above-mentioned conventional methods, it is necessary to insert a microphone into the pipe at the detection point to take out the sound in the pipe. However, in the case of a gas pipe, since gas is present in the pipe, the microphone is not used. In order to insert it into the pipe, special treatment must be applied to the insertion point, which is troublesome and poor in workability. In addition, it requires skill to directly recognize the picked-up sound by ear, and it is difficult to make accurate identification. The present invention has been made in view of the above problems of the prior art, and an object thereof is workability and a method of detecting an attribute of a city gas pipe system capable of accurately identifying an attribute of the pipe and the method. To provide a device for carrying out.

[0004]

In order to achieve the above object, in the method of detecting an attribute of a pipe system in a city gas pipe according to the present invention, an arbitrary reference serving as a detection reference from outside in a continuously connected city gas pipe is provided. A reference sound wave is introduced, and the sound wave vibration that has propagated through the gas pipe at the required location is detected by a vibration pickup from the surface of the gas meter or the gas pipe. It is intended to discriminate whether or not it belongs to the piping system into which is introduced. And, the attribute detecting device of the city gas pipe system for carrying out the above method, a sound wave transmitter for transmitting a sound wave of an arbitrary frequency and causing this sound wave to flow into the pipe, and a gas meter or a gas pipe at a required location. It is provided with a vibration pickup which is attached and detects a sound wave vibration propagating to a gas meter through a gas pipe, and a sound wave detector which displays the vibration data detected by the vibration pickup in a waveform. The sound wave detector inputs the vibration data detected by the vibration pickup, performs FIR filter processing, and calculates the vector sum in real time. A high-speed digital signal processor and a calculation data from the high-speed digital signal processor are sequentially received and received. Display output control means for performing waveform display processing on the output data and outputting the data,
And a display unit for displaying the data processed by the display output control means.

[0005]

In the method for identifying the pipe system in the city gas pipe configured as described above, in the case where the pipe to be identified belongs to the pipe system into which the reference sound wave has flowed, the pipe is introduced into the pipe at the reference sound wave inflow location. When the reference sound wave that has flowed in is detected as a sound wave vibration corresponding to the reference sound wave from the surface of the gas meter or the identification target pipe installed in the identification target pipe, and the identification target pipe does not belong to the piping system into which the reference sound wave has flowed in,
Sound wave vibration cannot be detected. Further, in the above apparatus for carrying out the above method, the pipe to be identified belongs to the pipe system into which the reference sound wave is introduced, and when the vibration pickup detects the sound wave vibration, the sound wave vibration is converted into a waveform and the sound wave is detected. Displayed on the container.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The examples described below are intended to clarify the customers to which the recorder is attached at the time of the interruption test, which reveals the sector to which the customer belongs in the gas piping system at the time of natural gas conversion and the independence of the conduit network for each sector. The case of confirming the lead-in pipe system up to each meter will be described by taking an apartment house as an example.

In FIG. 1, A is a gas pipe, B is a sector line,
5 is a sector valve provided in the gas pipe A on the sector line B, and C is, for example, a four-story apartment house built in the sector Ba divided by the sector line. The gas intake to the first floor of each apartment house C. The pipe a1 is drawn from the gas pipe A1 in the sector Ba, and the gas intake pipes a2 on the second to fourth floors are drawn from the gas pipe A2 outside the sector Bb. Further, 1 is a gas meter on the first floor of apartment house C, 2 and 3 and 4 are gas meters on the second, third and fourth floors, respectively.

Now, in a state where the service pipe system of the housing complex 4 is unknown, in order to confirm the service system, first the sector valve 5 is closed and the gas pipe A from the vertical pipe 6 of the Ba in the sector.
A predetermined sound wave is caused to flow into the inside of the gas meter, and the presence or absence of propagation of the sound wave vibration to the gas meters 1 to 4 is detected. The flow of the sound wave into the gas pipe A is performed by the sound wave transmitter 7, an arbitrary frequency is set, and the sound wave of the set frequency is intermittently sent into the gas pipe A at a predetermined cycle, for example. On the other hand, the vibration pickup 8 is used to detect the sound wave vibration in the gas meters 1 to 4.
By.

The vibration pickup 8 detects the sound wave vibration propagating through the gas pipe A from the surface of the gas meter and generates a voltage signal. The vibration pickup 8 is provided on all surfaces of each floor or on the surfaces of arbitrary gas meters 1 to 4 representing each floor. Install. Then, each vibration pickup 8 is connected to a sound wave detector 9.

The sound wave detector 9 includes a preamplifier 9a, an analog bandpass filter 9b (hereinafter referred to as BPF), an A / D converter 9c, a high-speed digital signal processor 9d (hereinafter referred to as DSP).
Display output control means 9e, display section 9f, operation keys 9g
Etc., the preamplifier 9a amplifies the weak voltage signal from the vibration pickup 8, the BPF 9b cuts 1/2 or more of the A / D sampling and removes signals other than the detection frequency, and passed this BPF 9b. A / D signal
The converter 9c converts an analog signal into a digital signal. As the detection frequency, the input frequency set by the sound wave transmitter 7 is input by operating the key 9g.

The data converted into a digital signal by the A / D converter 9c is input to the DSP 9d. DSP9d is FI
The R filter 9d-1 and the calculating means 9d-2 are provided, the data input from the A / D converter 9c is subjected to FIR filter processing, and the vector sum calculation is performed in real time for each sampling of the A / D converter 9c. Further, the integration is performed until the calculation output is received by the display output control means 9e.

The display output control means 9e comprises a CPU, and D
The operation data from SP9d is sequentially received, an output for displaying the waveform is generated based on the received data, and the state of the detected sound wave vibration is displayed as a waveform on the display unit 9f based on this output. . The display unit 9f is composed of a liquid crystal display (LCD).

From the gas meter 1 on the first floor drawn from the gas pipe A1 in the sector Ba, a sound wave vibration corresponding to the inflowing reference sound wave is detected, and sound wave detection connected to a vibration pickup 8 attached to the gas meter 1 is detected. The state is displayed on the display portion 9f of the device 9 as a waveform rising at the same period as the sound wave generation by the sound wave generator 7, for example. On the other hand, no sound wave vibration corresponding to the reference sound wave is detected from the gas meters 2 to 4 on the second to third floors drawn from the gas pipe A2 outside the sector Bb, and the vibration pickups 8 attached to these gas meters 2 to 4 are detected. Nothing is displayed on the display 9f of the connected sound wave detector 9. That is, from the display on the display section 9f of the sound wave detector 9, it is confirmed that the sound wave is detected from the gas meter 1 on the first floor.
It is confirmed that no sound wave is detected from the gas meters 2 to 4 on the fourth floor.

Therefore, according to the display of these sound wave detectors 9, there are two or more lead-in pipes in the same building, and the gas meter 1 on the first floor is the lead-in pipe from the gas pipe A1 of the Ba in the sector.
Gas meters 2 to 4 on the other floors are Bb gas pipes outside the sector
It can be identified as a service pipe from A2.

[0015]

[Effect] Since the present invention is configured as described above, the following effects can be obtained. (1). A reference sound wave is caused to flow into the gas pipe, and this sound wave is detected as a sound wave vibration from the gas meter surface or the gas pipe surface at the identification target portion, and the above detection unit causes the reference sound wave to flow depending on whether or not the sound wave vibration corresponding to the reference sound wave is detected. Since it is determined whether or not it belongs to the piping system, it is not necessary to perform any special processing on the gas pipe to identify the attribute of the piping system, and the identification work can be easily performed. (2). When the sound wave vibration is detected, the detected signal level is displayed as a waveform on the display unit of the sound wave detector, so that it is easy to confirm and there is no risk of misidentification. (3). Since the FIR is performed by the DSP, the frequency of the reference sound wave can be arbitrarily selected.

[Brief description of drawings]

FIG. 1 shows a method for detecting an attribute of a city gas piping system according to the present invention.
Explanatory drawing which shows the case where it implements in order to confirm the service pipe system of each floor in an apartment house.

FIG. 2 is a block diagram showing a schematic configuration of an apparatus for performing the above method.

FIG. 3 is an explanatory diagram showing an example of a display of a sound wave detector.

[Explanation of symbols]

A: Gas pipe 1, 2, 3, 4: Gas meter 7: Sound wave transmitter 8: Vibration pickup 9: Sound wave detector 9d: High speed digital signal processor (DSP) 9e: Display output control means 9f: Display unit (L)
CD)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masami Ishida 1-6-18 Sanno, Hakata-ku, Fukuoka City, Fukuoka Prefecture Kyushu Measuring Instruments Co., Ltd.

Claims (3)

[Claims] 1. An arbitrary reference sound wave serving as a detection reference is introduced from the outside into a continuously connected city gas pipe, and the sound wave vibration propagating through the gas pipe at a required location is transmitted from a gas meter surface or a gas pipe surface. Detecting using a vibration pickup, by the presence or absence of detection of sound wave vibration corresponding to the reference sound wave, the above-mentioned detection unit identifies whether or not it belongs to the piping system into which the reference sound wave has flowed Attribute detection method. 2. A sound wave transmitter for transmitting a sound wave of an arbitrary frequency to allow the sound wave to flow into a pipe, and a sound wave vibration transmitted to a gas meter through a gas pipe by being attached to a gas meter or a gas pipe surface at a required location. An attribute detection device for a pipeline system of city gas, comprising: a vibration pickup for detecting a vibration and a sound wave detector for displaying the vibration data detected by the vibration pickup in a waveform. 3. A high-speed digital signal processor for inputting vibration data detected by a vibration pickup by a sound wave detector to perform FIR filter processing and calculating vector sum in real time, and calculation data from the high-speed digital signal processor in sequence. The city gas pipe according to claim 2, further comprising: a display output control unit that receives and processes the received data in a waveform display process and outputs the data, and a display unit that displays the data processed by the display output control unit. System attribute detection device.