JPH0439900B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a calibration sound source with a capacitor-type high temperature resistant, radiation resistant, vibration resistant, and moisture resistant microphone attached via an anti-vibration case and a moisture-proof cover, and a connector base. The flange base is fixed via an outer stay, and one end of the waveguide is attached to a converter case placed in a low-temperature atmosphere, and a sound absorbing material is installed inside to prevent standing waves and block hot air. connected to the calibration sound source, supporting the middle of the waveguide with the vibration isolation case parallel to the waveguide via a pipe holder;
By placing the other end of the waveguide, which is bent at one end of the waveguide, in front of the sound receiving section of the microphone, which is placed in a high-temperature atmosphere, a high-radiation atmosphere can be avoided. A condenser-type high-temperature, radiation-resistant, vibration-resistant, and moisture-resistant microphone that allows for safe and easy maintenance and inspection without entering the reactor containment vessel or shutting down the equipment (reactor). This invention relates to a calibration sound source device.

[Conventional technology]

Capacitor-type high-temperature, radiation-resistant, vibration-resistant, and moisture-resistant microphones are conventionally used as acoustic wave detection sensors in high-temperature air (approximately 300°C) under high radiation (10 ⁷ R) inside nuclear reactor containment vessels. . This microphone is regularly tested to ensure its safety and reliability. During periodic inspections, people go under high radiation conditions and directly apply a calibration sound source to the microphones to confirm the safety and reliability of the microphones.

[Problem that the invention seeks to solve]

However, because workers have limited working time under high radiation conditions, it takes a long time to conduct multiple inspections, which is extremely dangerous, or requires several people to perform the inspection. There is a problem with this. Furthermore, there is another problem in that the reactor must be shut down for inspection, which requires a large amount of time and expense.

The present invention was made to solve the problems of the prior art.

[Means for solving problems]

Means for solving the above problems will be explained below using FIGS. 1 and 2, which correspond to embodiments.
In this invention, the calibration sound source 20 is connected to a capacitor-type high temperature resistant
Equipped with a radiation-resistant, vibration-proof, and moisture-proof microphone,
The flange base is fixed via the connector base 7 and the outer stay 16, and is attached to the converter case 2 placed in the low temperature side atmosphere.
Sound absorbing material 3 to prevent standing waves and block hot air inside
3 is attached to the waveguide 30 is connected to the calibration sound source 20, and the middle of the waveguide 30 is supported by the vibration isolation case 4 parallel to the waveguide 30 via the pipe holder 34. A capacitor-type high-temperature resistant capacitor having one end of the waveguide 30 bent, the other end of the waveguide 30 being placed in a high-temperature atmosphere, and placed in front of the sound receiving section 3 of the microphone. , relates to a calibration sound source device for radiation-resistant, polar vibration-resistant, and humidity-resistant microphones.

[Effect]

In the device configured in this way, by operating the calibration sound source 20 attached to the converter case 2 placed in the low temperature side atmosphere, the sound waves are placed in the high temperature side atmosphere via the waveguide 30. is given to the sound receiving section 3.

〔Example〕

FIGS. 1 and 2 are diagrams showing an embodiment of the present invention. In Figures 1 and 2, 1 is an impedance converter, 2 is a converter case, 3 is a sound receiver, 4 is a vibration-proof case, 5 is a flange base, 6 is a case holder, 7 is a connector base, and 20 is for calibration. The sound source 30 is a waveguide.

The calibration sound source 20 is a speaker 21 serving as a sound source.
The speaker is fixed to the speaker 21 via a speaker duct 22 that is fixed behind the speaker 21 and emits sound pressure from the back of the speaker 21 to the outside, and a speaker throat 23 that emits sound waves from the speaker 21. a speaker holder 24 that supports the speaker holder 21 and is fixed to the connector base 7 and fixes the speaker 21 to the connector base 7; The speaker cover 25 is fixed, the sealing gasket 26 is placed between the speaker duct 22 and the speaker cover 25 and seals the inside of the converter case 2, and the speaker holder 24 is fixed to propagate sound waves. Short phone 27 and
It consists of a heat shielding/vibration isolating sleeve 28 which is fixed to the shotphone 27 and to which one end of the waveguide 30 is connected. The speaker 21 is a dome-shaped speaker, and 21A is its diaphragm. The vibrating membrane 21A is made of a heat-resistant material such as titanium, and blocks heat from hot air passing through the waveguide 30. A driving wire (not shown) of the speaker 21 is drawn out from an outlet of the speaker cover 25 and converter case 2, and the outlet is sealed with silicone adhesive. The speaker duct 22 is provided with a plurality of holes 22A, and the sound pressure on the back of the speaker 21 is determined by the holes 22A.
is released to the outside through. This emission improves the particularly low frequency characteristics of the speaker 21. The speaker throat 23 is the vibrating membrane 2
The sound wave of the vibrating membrane 21A is squeezed and released from a hole 23A provided in the middle of the vibrating membrane 21A. The speaker throat 23 is screwed to the speaker holder 24, and the speaker throat 23 is screwed to the speaker holder 24.
are screwed to the speaker cover 25 and the connector base 7. In addition, the speaker cover 25
is screwed to the converter case 2, and the converter case 2 is screwed to the connector base 7. Short phone 27 is speaker holder 2
4, and the heat shielding/vibration isolating sleeve 28 is fitted onto the seat phone 27. The heat shielding/vibration isolating sleeve 28 is made of silicone rubber, and the waveguide 3
Blocks heat and vibration transmitted from 0. Calibration sound source 2
0 is sealed inside the converter case 2 and isolated from the impedance converter 1. Therefore, the abnormal wind pressure from the high-temperature side atmosphere affects the waveguide 3.
Even if the vibrating membrane 21A is damaged by passing through the impedance converter 1, the impedance converter 1 is not affected and operates normally as an acoustic wave detection sensor. In order to make the device compact, the calibration sound source 20 is installed in the converter case 2.
Although the calibration sound source 20 is arranged inside the converter case 2, it goes without saying that the calibration sound source 20 may be arranged outside the converter case 2.

The waveguide 30 is constructed by linearly connecting two waveguides 30A and 30B with a joint sleeve 31. The waveguide 30A has a substantially U-shape, and the other end is placed in front of the sound receiving section 3. The waveguide 30B has a straight shape, and one end thereof is connected to the heat shielding/vibration isolating sleeve 28. The waveguide 30 is composed of two waveguides 30A and 30B by converting the waveguide 30B to one with a different diameter or a hole.
This is to control the frequency characteristics at the front of the receiving section 3 in accordance with the characteristics of the receiver. Furthermore, in order to prevent the generation of standing waves in the waveguide 30, the waveguide 30 is
This is to fix the sound absorbing material 33 placed inside the 0 at a predetermined position. A grid 32 having many small holes is fitted to both ends of the waveguide 30B, and a sound absorbing material 33 is attached to the grid 32. The sound absorbing material 33 is fixed at a predetermined position by the waveguide 30B and the grid 32 having a certain length. Sound absorbing material 3
As the sound absorbing material 33, glass wool or the like is used.
This prevents the generation of regular waves in the wave guide 30, and also prevents hot air from entering through the wave guide 30A. The waveguides 30A and 30B are supported by the vibration isolation case 4 via a pipe holder 34.

Next, to explain this microphone by adding FIG. 3 to FIGS. 1 and 2, a spring receiver 8 is screwed into one end of the vibration-proof case 4, and a case holder 6 is screwed into the other end. A seal pipe 9 passes through the inside thereof, and a seal pipe joint 10 projects from one end surface, and the seal pipe 9 projects from the other end surface. The vibration isolation springs 11A and 11B are attached to the sound receiving section 3 and the seal pipe joint 10 with the spring receiver 8 in between. Anti-vibration spring 11
Metal springs are used as A and 11B, and are arranged symmetrically. One end of a moisture-proof cover 14 is attached to the other end of the seal pipe 9 with a spring holder 12 and a cap 13.
The other end is the connector base 7 and the board holder 15
It is inserted. Heat-resistant rubber with a small spring constant is used as the moisture-proof cover 14 so as not to affect the vibration-proofing effect. The board holder 15 is screwed to the connector base 7. The converter case 2 is screwed to the connector base 7, and houses the impedance converter 1 and the calibration sound source 20 therein. Impedance converter 1
is fixed to the connector base 7 by the support column 7A and a nut, and is sealed inside the converter case 2.

One end of an outer stay 16 is screwed to the flange base 5, and the other end is elastically fixed to the connector base 7 by a set screw 16A, a nut 16B, and a vibration isolating rubber 16C. The outer stays 16 are arranged at intervals of 90°. One end of an inner stay 17 is screwed to the case holder 6, and the other end is elastically fixed to the connector base 7 by a set screw 17A, a nut 17B, and a vibration isolating rubber 17C. The inner stays 17 are arranged at intervals of 120°. Stainless steel with low thermal conductivity is used for the inner stay 17, and its cross-sectional area is made as small as possible and its length is made as long as possible. Although the case holder 6 and the flange base 5 are arranged concentrically, they are not connected. Connector 18 is screwed to converter case 2. The signal line 19 is for introducing the output signal from the sound receiving section 3 into the impedance converter 1.
Seal pipe joint 10, seal pipe 9,
It is connected to the input side of the impedance converter 1 through the moisture-proof cover 14 and the board holder 15.
The output side of impedance converter 1 is connector 1
It is connected to the input side of 8.

When the flange base 5 is fixed to the low-temperature side of the location where it is used, for example, to the outer wall of the nuclear reactor insulation box, the sound receiving section 3, waveguide 30A, etc.
℃), and the moisture-proof cover 14, calibration sound source 20, etc. are placed outside the heat insulating box in a low-temperature atmosphere (50°C).
Heat conduction from the high temperature section to the low temperature section is prevented by the heat shielding/vibration isolating sleeve 28 and the inner stay 17. Further, since the signal line 19 is sealed within the seal pipe 9 and the moisture-proof cover 14, it is not affected by external moisture. Furthermore, external vibrations from the flange base 5 are sufficiently attenuated by the vibration isolating springs 11A, 11B, the vibration isolating rubbers 16C, 17C, and the heat shielding/vibration isolating sleeve 28.

When calibrating the microphone, it is sufficient to simply drive the calibration sound source 20. Sound waves generated by driving the calibration sound source 20 are applied to the sound receiving section 3 through the waveguide 30. During calibration, there is no need to enter the reactor containment vessel, which has a high radiation atmosphere, and there is no need to shut down the equipment (reactor).

〔Effect of the invention〕

As explained above, the present invention connects a calibration sound source to a capacitor-type high-temperature-resistant, radiation-resistant, vibration-proof, and moisture-proof microphone via a vibration-proof case and a moisture-proof cover, and connects the calibration sound source to a capacitor-type high-temperature-resistant, radiation-resistant, vibration-proof, and moisture-proof microphone via a connector base and an outer stay. The flange base is fixed and attached to the converter case placed in the low-temperature atmosphere, and one end of the waveguide, which is equipped with sound-absorbing material to prevent standing waves and block hot air, is connected to the sound source for early calibration. The middle of the waveguide is directed by the moisture-proof case parallel to the waveguide via a pipe holder, and the other end of the waveguide is bent toward one end of the waveguide. The present invention relates to a calibration sound source device for a capacitor-type high-temperature-resistant, radiation-resistant, vibration-proof, and moisture-proof microphone, which is placed in a high-temperature atmosphere and is placed in front of a sound receiving section of the microphone. Therefore, by operating the calibration sound source placed in the low-temperature atmosphere,
The sound waves are applied to the sound receiver placed in the high-temperature atmosphere through the waveguide to calibrate the microphone, allowing the equipment (reactor) to be calibrated without entering the reactor containment vessel, which has a high radiation atmosphere. There's no need to stop it. Therefore, according to the present invention, it is possible to perform maintenance and inspection safely and easily.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the invention, FIG. 2 is a perspective view showing an embodiment of the invention,
FIG. 3 is a partial sectional view of a capacitor type high temperature resistant, radiation resistant, vibration resistant, and moisture resistant microphone constituting the present invention. 1... Impedance converter, 2... Converter case, 3... Sound receiver, 4... Anti-vibration case, 2
0...Calibration sound source, 30...Waveguide, 34...Pipe holder.

Claims (1)

[Claims] 1. A calibration sound source is attached to a capacitor-type high temperature resistant, radiation resistant, vibration resistant, and moisture resistant microphone via an anti-vibration case and a moisture-proof cover, and a flange base is fixed via a connector base and an outer stay. , one end of the waveguide, which is attached to a converter case placed in a low-temperature atmosphere and equipped with a sound absorbing material for preventing the generation of standing waves and blocking hot air inside, is connected to the calibration sound source, and the waveguide is The middle of the pipe is supported by the vibration isolation case parallel to the waveguide via a pipe holder, and the other end of the waveguide, which is bent toward one end of the waveguide, is placed in a high-temperature atmosphere. A calibration sound source device for a capacitor-type high temperature resistant, radiation resistant, vibration resistant, and moisture resistant microphone, which is disposed in front of a sound receiving section of the microphone. 2. The calibration sound source is transmitted through a speaker that serves as a sound source, a speaker duct that is fixed behind the speaker and emits sound pressure from the back of the speaker to the outside, and a speaker throat that emits sound waves from the speaker. A speaker holder that is fixed to the speaker and supports the speaker and is fixed to the connector base and fixes the speaker to the connector base, and a speaker holder that is fixed to the speaker holder and the converter case and supports the speaker. A speaker cover fixed to the converter case, a sealing gasket arranged between the speaker duct and the speaker cover to seal the inside of the converter case, and a sealing gasket fixed to the speaker holder to prevent sound waves. The capacitor-type high-temperature resistant, high-temperature resistant capacitor according to claim 1, comprising a shotphone that propagates a waveguide, and a heat-insulating/vibration-proofing sleeve that is fixed to the shotphone and to which one end of the waveguide is connected. Calibration sound source device for radiation-, vibration-, and moisture-proof microphones. 3. A capacitor type high temperature resistant capacitor according to claim 1 or 2, wherein the waveguide is constructed by connecting a plurality of waveguides of the same size in a straight line;
Calibration sound source device for radiation-proof, vibration-proof and moisture-proof microphones. 4. A capacitor-type high-temperature-resistant, radiation-resistant, vibration-resistant, and moisture-resistant microphone according to claim 1 or 2, wherein the waveguide is constructed by directly connecting a plurality of waveguides of different sizes. Calibration sound source device.