JP3295680B2 - In-tube sound collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe sound collector for collecting sound in a gas pipe and detecting an abnormality in the pipe. The present invention relates to an in-pipe sound collector that does not cause leakage of gas from a pipe.

[0002]

2. Description of the Related Art A leak position specifying method for detecting a leak sound of a pipe by detecting a leak sound generated at the time of gas leak by a microphone has been conventionally known. In order to identify the location of gas leakage using this leak location identification method, it is necessary to insert a microphone inside the gas pipe, conventionally cut the middle of the pipe, install cheese in the cut part, cheese A microphone is inserted from the section or a hole is made in the pipe wall of the pipe, and the microphone is inserted into the gas pipe through a clamp attached to the hole.

[0003]

However, in the conventional method for inserting a microphone, when the microphone is inserted, the gas is blown out from inside the pipe, so that the supply of the gas has to be stopped in order to mount the microphone.

If the gas in the jig is not sufficiently purged, the composition of the gas around the microphone is different from the composition of the gas in the tube, and a change in the sound velocity occurs between them, so that the leak position can be accurately measured. Disappears.

When a microphone is attached to a branch pipe or the like without inserting the microphone to the center of the pipe, a case where the leaked sound wave cannot be received correctly due to the influence of the cutoff frequency due to the difference in the pipe diameter between the gas pipe and the branch pipe. Occurs.

[0006]

According to the present invention, there is provided a sound collector body having substantially the same diameter as a gas pipe and having one end fixed to an end of the gas pipe. A microphone that branches from the main body, holds the microphone at substantially the center of the main body, a sound absorbing section provided at the other end of the main body to absorb sound, and a sound absorbing section. And an exhaust valve provided at the end of the
An in-pipe sound collector was configured so that the inside of the main body was filled with gas and the sound generated in the pipe was collected by the microphone.

An opening / closing section for opening / closing a hole formed in a side of the gas pipe by a perforator, and a microphone which is supported so as to be able to move back and forth toward the hole formed in the gas pipe while maintaining the airtightness, A holding unit that holds the microphone at the center of the pipe by opening the opening / closing unit and advancing the microphone,
An exhaust valve is provided at an end of the holding portion and discharges internal gas. The in-pipe sound collector is configured so that sound in the pipe is collected by the microphone.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tube sound collector according to the present invention will be described.

FIG. 1 and FIG. 2 show an overall view of an in-pipe sound collector 2. As shown in FIG. 1 and the like, the in-pipe sound collector 2 includes a microphone 4,
It comprises a holding section 6 for holding the microphone 4, a main body section 8 and the like.

The main body 8 has a cylindrical shape having substantially the same diameter as the pipe 10 (shown in FIG. 4), and one (upper part in the figure) is provided with a screw 11 screwed to the pipe 10, and the other end (lower part in the figure). 2), an exhaust valve 14 is attached via a sound absorbing material 12. The holding section 6 is provided vertically on the side surface of the main body section 8, and the microphone 4 can be airtightly fixed by inserting the microphone 4 and closing the screw 13.

FIG. 3 shows the microphone 4. The microphone 4 is a microphone having a sound collection unit 5 at the tip, and is preferably particularly sensitive to gas leakage noise, and has a purge exhaust valve 30 at the rear. When the microphone 4 is attached to the holding unit 6, the sound collecting unit 5 of the microphone 4 is disposed substantially at the center of the main body 8. The sound absorbing material 12 is made of an absorbing material that absorbs internal sound, and does not reflect sound to the microphone 4 side. Exhaust valve 1
Reference numeral 4 denotes a valve for discharging gas inside the main body 8 to the outside by operating the lever 15.

Next, a method of using the in-pipe sound collector 2 will be described.

[0013] First, a home service pipe 1 shown in FIG.
0, shut off the on-off valve 22, remove the set screw 27 on the inflow side of the flow meter 25 installed in the pipe 10, and loosen the set screw 28 on the outflow side, and as shown in FIG.
The flow meter 25 is rotated by 1/4 rotation around 0. Then, the screw 11 of the main body 8 is screwed to the inflow side pipe 10 with the screw 27, and then the microphone 4 is attached to the holding unit 6.
Note that the microphone 4 may be attached in advance.

Next, the exhaust valve 14 of the main body 8 and the exhaust valve 30 of the microphone 4 are opened, and the open / close valve 22 of the pipe 10 is further opened to fill the main body 8 and the holding section 6 with gas.
If the outflow of gas is detected from the above, the exhaust valve 14 and the exhaust valve 30 are immediately closed.

As described above, when the in-pipe sound collector 2 is fixed to the pipe 10 and the inside is filled with gas, the microphone 4 is connected to an analyzer (not shown) to generate the gas in the pipe 10. Collect sound. The sound is amplified via an amplifier or the like, and analyzed to select a sound leaking from a damaged portion of the pipe 10 to detect a leaked portion. Since the sound collecting section 5 of the microphone 4 is disposed at the center of the main body 8 communicating with the pipe 10, the sound generated in the pipe 10 can be clearly sensed to perform a work such as detection of a leak location. Can be performed accurately.

Further, another embodiment of the tube sound collector will be described with reference to FIG.

The in-pipe sound collector 3 uses a joint 52 for perforating the side surface of the pipe 10 to connect the other pipes 10.
4 is installed in the pipe 10.

The joint 52 is a so-called magic joint, and is connected to a pipe 1 using a perforator (not shown).
A hole is drilled at 0, and the pipe 10 is connected to the threaded portion 70 on the side. Specifically, the base 58 of the joint 52
The on-off valve 60 is attached to the hole, and the perforator is attached via the on-off valve 60. The drilling machine can project the drilling blade toward the pipe 10, and presses the drilling blade against the side surface of the pipe 10 by the explosive force of the explosive to drill a hole in the side surface. The on-off valve 60 is opened and closed by moving the slide door 61 back and forth by a slide-type on-off valve.
When a hole is formed in the pipe 10 by the punch, the on-off valve 60 is closed, the punch is removed, and the holder 56 is attached to the base 58 instead.

The holding section 56 hermetically mounts the mounting section 62 of the microphone 54, and is detachable. As shown in FIG. 6, the microphone 54 has a sound collecting section 5 at the tip, and a mounting section 62 is provided on the body section 64 so as to be able to move back and forth while maintaining airtightness. Further, an exhaust valve 8 for purging is provided at the rear (upper side in the figure).
0 is provided.

When the mounting portion 62 of the microphone 54 is mounted on the holding portion 56, the open / close valve 60 is opened and the microphone 54 is connected to the pipe 10
Let go inside. Next, the exhaust valve 80 is opened and the air in the holding portion 56 is exhausted.

When the in-pipe sound collector 3 is fixed to the base 58 in this manner, the sound generated in the pipe 10 can be efficiently collected because the sound sensing part 5 of the microphone 54 is disposed in the pipe 10. A sound that can be produced and collected is analyzed by an analysis device connected to the microphone 54, and a leakage point or the like of the pipe 10 is detected. When the leak inspection in the pipe 10 is completed, the microphone 54
Is retracted (pulled up), the on-off valve 60 is closed, and the holding portion 5
The microphone 54 is detached from 6, and after the microphone 54 is detached, a closure (not shown) is attached. When the closure is attached, the on-off valve 60 is opened, and the closure is closed from the closure (not shown).
Is fixed to the base 58, and the hole for perforation is closed with a closing lid. When the hole is closed, the closure and the on-off valve 60 are removed from the base 58.

As described above, according to the in-pipe sound collector 2 or 3 of the present invention, gas does not leak from the pipe 10
The microphone 4 and the like can be easily and reliably attached to the pipe 10 and filled with the same gas as the gas in the pipe, and the sound collection unit 5 can be arranged at the center of the pipe 10. Leakage noise or the like generated in the pipe 10 can be sensed with high efficiency without causing a frequency cutoff due to a difference in pipe diameter.

[0023]

According to the in-pipe sound collector of the present invention, the microphone is arranged at the center of the pipe and the same gas atmosphere as in the pipe can be obtained, so that the sound in the pipe caused by leakage or the like can be surely and reliably. It can be sensed with high efficiency. This makes it possible to reliably detect a damaged portion of the pipe such as a crack.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a tube sound collector according to the present invention.

FIG. 2 is a perspective view showing one embodiment of the in-pipe sound collector according to the present invention.

FIG. 3 is a diagram showing a microphone.

FIG. 4 is a view showing an attached state of the in-pipe sound collector according to the present invention.

FIG. 5 is a side view showing another embodiment of the in-pipe sound collector according to the present invention.

FIG. 6 is a diagram showing a microphone of the tube sound collector shown in FIG. 5;

[Explanation of symbols]

 2, 3 In-pipe sound collector 4, 54 Microphone 5 Sound collecting part 6 Holding part 8 Main part 12 Sound absorbing part 13 Screw 14, 30, 80 Exhaust valve 15 Lever 52 Joint 54 Microphone 56 Holding part 58 Base 60 Opening / closing valve 61 Opening / closing Door 64 Mounting part 70 Screw part

Continuation of the front page (56) References JP-A-7-159276 (JP, A) JP-A-8-43240 (JP, A) JP-A-5-205177 (JP, A) Japanese Utility Model Application Sho 62-182436 (JP) , U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01M 3/24

Claims (2)

(57) [Claims] 1. A sound collector main body having substantially the same diameter as a gas pipe and having one end fixed to an end of the gas pipe; a microphone for sensing sound in the pipe; A holding portion for holding the sound source substantially at the center of the body portion, a sound absorbing portion provided on the other end side of the body portion for absorbing sound, and an exhaust valve provided at an end portion of the sound absorbing portion for discharging gas inside. An inside pipe sound collector, wherein the inside of the main body is filled with gas and the sound generated in the pipe is collected by the microphone. 2. An opening and closing unit for opening and closing a hole formed in a side of a gas pipe by a punch, and supporting a microphone forward and backward in a state of maintaining airtightness toward the hole formed in the gas pipe, A holding unit that holds the microphone at the center of the pipe by opening the opening / closing unit and moving the microphone forward; and an exhaust valve provided at an end of the holding unit to discharge gas inside the holding unit. A sound collector in a pipe, wherein sound from the pipe is collected by the microphone inserted into the pipe through the hole.