JP4342738B2 - Ultrasonic leak detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ultrasonic leak detection apparatus used when detecting leak positions of various facilities such as fluid piping systems and sealed containers that are installed in many plants and factories.
[0002]
In facilities such as plants and factories, it is very important to periodically detect the presence or absence of leaks in order to obtain the maximum production with the minimum energy consumption and to maintain the highest production quality. When a leak occurs in the equipment, an ultrasonic wave is generated from the leak point, and the leak position can be detected by detecting this ultrasonic wave with an ultrasonic leak detection device using a directivity ultrasonic microphone. .
[0003]
[Prior art]
A conventional ultrasonic leak detection apparatus is disclosed in, for example, Japanese Patent Laid-Open No. 7-253377. An ultrasonic leakage detection apparatus disclosed herein includes a portable probe, a directivity ultrasonic microphone, a signal processing circuit that processes an electrical signal detected by the ultrasonic microphone, and a process performed by the signal processing circuit. And an output unit for visually outputting the processed signal.
[0004]
This ultrasonic leak detection device is used by holding the probe with one hand and gradually changing the direction of the probe, that is, gradually changing the direction of the ultrasonic microphone having directivity. When fluid is leaking outside from the equipment to be measured, when the directivity direction of the ultrasonic microphone approaches the direction of the leak position, the ultrasonic wave radiated from the leak position becomes an electrical signal by the ultrasonic microphone. The electric signal is detected, amplified and processed by a signal processing circuit, and output visually to the output unit. And since the output value of an output part becomes the maximum when the directivity direction of an ultrasonic microphone corresponds with the leak position, the leak position can be detected by the directivity direction of the ultrasonic microphone at this time.
[0005]
[Problems to be solved by the present invention]
The above-described conventional ultrasonic leak detection apparatus is for visually confirming the directivity direction of the ultrasonic microphone when the output value of the output unit is maximized, and therefore has a field of view for confirming the directivity direction of the ultrasonic microphone. There was a problem that the leak location could not be detected quickly. Therefore, the technical problem of the present invention is to provide an ultrasonic leak detection device that can quickly detect a leak position.
[0006]
[Means for Solving the Problems]
The technical means of the present invention taken in order to solve the above technical problem includes an ultrasonic microphone having directivity, a signal processing circuit for processing an electric signal detected by the ultrasonic microphone, and the signal processing circuit. An aiming unit comprising an output unit for visually and / or audibly outputting the signal processed in step 1, a probe on which at least the ultrasonic microphone is disposed, and an sight and / or sight gate disposed on the probe. And an ultrasonic leakage detection device.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to the above technical means of the present invention, the field of view for confirming the directing direction of the ultrasonic microphone can be narrowed down by the sighting device comprising the sight and / or the sight gate disposed on the probe, and the leakage position can be reduced. It can be detected quickly.
[0008]
【Example】
Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an external view of the ultrasonic leak detection apparatus of the present invention, FIG. 2 shows a block diagram of an electrical circuit of the ultrasonic leak detection apparatus of the present invention, and FIG. 3 shows an end view of AA in FIG. 4 is an end view taken along the line BB of FIG. The probe 2 of the ultrasonic leak detection apparatus 1 has a pistol shape, and includes an upper part 3 having an elliptical longitudinal section and a lower part 4 having a substantially rectangular transverse section. The outer diameter of the lower part 4 is large enough to be held with one hand.
[0009]
As shown in FIG. 3, six ultrasonic microphones 7 having directivity for detecting ultrasonic waves emitted from the equipment to be measured are disposed at the left end portion 5 of the upper portion 3. Each of the six ultrasonic microphones 7 is located at the apex of a regular hexagon.
[0010]
A turret 31 having an opening 32 is formed on the upper outer periphery of the right side of the upper part 3, and an illuminating star 33 having an opening 34 is formed on the upper outer periphery of the left side of the upper part 3. A sighting device is formed by the sight 31 and the sight 33. The sighting device may be formed by either the sight 31 or the sight 33.
[0011]
A signal processing circuit 14 is disposed in the probe 2. As shown in FIG. 4, a display unit 16 such as a liquid crystal panel configuration for visually displaying a signal processed by the signal processing circuit 14 on the right end surface 15 of the upper portion 3 and an operation unit having a plurality of push button key configurations. 17 are disposed. A power switch 18 is disposed at the upper left end of the lower part 4. An output terminal 20 for audibly outputting the signal processed by the signal processing circuit 14 to the headphones 19 and the like and an input / output terminal 22 for connecting to the personal computer 21 and the like are disposed on the upper part 3.
[0012]
The signal processing circuit 14 includes an amplification unit 23, a filter unit 24, a detection unit 25, a rectification unit 26, an auto volume control unit 27, a laser drive unit 28, a storage unit 29, and a CPU (central processing unit) 30. The ultrasonic microphone 7 is connected to the display unit 16 through the amplification unit 23, the filter unit 24, the detection unit 25, the rectification unit 26, and the CPU 30. The detection unit 25 and the CPU 30 are connected to the headphones 19 through the auto volume control unit 27 and the output terminal 20. The CPU 30 is connected to the personal computer 21 through the input / output terminal 22. The operation unit 17 is connected to the CPU 30.
[0013]
When detecting the leakage position of the equipment to be measured, the lower part 4 of the probe 2 is grasped with one hand and, for example, the power switch 18 is pushed with an index finger to turn it on. Then, the direction of the ultrasonic microphone 7 having directivity is gradually changed by gradually changing the direction of the left end portion 5 of the upper part 3 of the probe 2 toward the equipment. When the fluid is leaking from the equipment to be measured, when the directivity direction of the ultrasonic microphone 7 approaches the direction of the leakage position, the ultrasonic wave radiated from the leakage position is converted into an electrical signal by the ultrasonic microphone 7. Detected and sent to the signal processing circuit 14.
[0014]
The electrical signal detected by the ultrasonic microphone 7 is amplified by the amplification unit 23, detected by the detection unit 25 through the filter unit 24, rectified by the rectification unit 26, processed by the CPU 30, and displayed on the display unit 16. . The electric signal detected by the detection unit 24 is output to the headphones 19 through the output terminal 20 after a signal of a certain level or more is narrowed by the auto volume control unit 27. The auto volume control unit 26 can protect the ear from abnormal sounds due to sudden air blows. When the directivity direction of the ultrasonic microphone 7 coincides with the leakage position, the output values of the display unit 16 and the headphone 19 are maximized. Therefore, the directivity direction of the ultrasonic microphone 7 at this time is determined by the aim of the sight 31 and the sight 33. The leak position can be detected quickly by checking with the instrument.
[0015]
【The invention's effect】
The present invention produces the following specific effects.
As described above, according to the present invention, since the field of view can be narrowed down by the sighting device comprising the sight and / or the sight gate disposed on the probe, the ultrasonic leakage detection device that can quickly detect the leakage position Can be provided.
[Brief description of the drawings]
FIG. 1 is an external view showing an embodiment of an ultrasonic leak detection apparatus of the present invention.
FIG. 2 is a block diagram showing an electrical circuit of the ultrasonic leakage detection apparatus of the present invention.
3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along the line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ultrasonic leak detection apparatus 2 Probe 7 Ultrasonic microphone 14 Signal processing circuit 16 Display part 17 Operation part 18 Power switch 19 Headphone 21 Personal computer 23 Amplification part 24 Filter part 25 Detection part 26 Rectification part 27 Auto volume control part 28 Laser drive part 29 storage unit 30 CPU
31 Terumon 33

Claims (1)

An ultrasonic microphone having directivity, a signal processing circuit that processes an electrical signal detected by the ultrasonic microphone, and an output unit that outputs the signal processed by the signal processing circuit visually and / or audibly, An ultrasonic leak detection apparatus comprising: a probe having at least the ultrasonic microphone; and a sighting device including an sight and / or a sight that is arranged on the probe.

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