Acoustic sensor calibrator cavity structure

Abstract

The utility model provides a sound wave sensor calibrator cavity structure, which can enable a sound wave sensor to receive stable and interference-free sound waves. The acoustic sensor calibrator cavity structure comprises an upper flange, a sound absorption layer, a loudspeaker mounting plate and a loudspeaker, the upper flange, the sound absorption layer and the loudspeaker mounting plate are stacked and mounted together through fasteners, and the loudspeaker is mounted on the lower end face of the loudspeaker mounting plate; the upper flange is used for placing a to-be-calibrated sonic sensor; circular holes are formed in the upper flange and the sound absorption layer and are used for accommodating a microphone of a to-be-calibrated sonic sensor; the loudspeaker mounting plate is provided with a circular hole at a position corresponding to the loudspeaker.

Description

Technical Field

[0001] This utility model relates to a cavity structure, specifically a cavity structure for a calibration instrument, and belongs to the field of industrial product technology. Background Technology

[0002] Leaks in the four boiler tubes (water-cooled wall tubes, superheater tubes, reheater tubes, and economizer) of thermal power plants are common accidents, accounting for approximately 60% of all power plant accidents. Once a boiler tube leaks, it will affect the safe and economical operation of the unit. Failure to detect leaks in a timely manner may lead to incalculable economic losses and safety accidents.

[0003] Real-time monitoring of the leakage status of the four boiler tubes can issue early warnings and monitor the development trend of leakage in a timely manner, enabling power plant operators to take timely measures to prevent the accident from escalating, prevent unplanned unit shutdowns, and prevent secondary leaks from causing work stoppages and production shutdowns.

[0004] The acoustic sensor for boiler pressure tube (four-tube) leakage monitoring is a pre-sensor used in boiler tube leakage detection systems. Its main function is to convert acoustic signals from the vicinity of the pressure-bearing pipes of the boiler water-cooled wall tubes, superheater tubes, reheater tubes, and economizer in thermal power plants into processable electrical signals. This allows for early detection of leaks in the pressure-bearing pipes and prediction of the potential spread of leaks, which is crucial for reducing unexpected downtime.

[0005] The sensitivity of acoustic sensors directly affects the accuracy of leak detection, making it crucial to check whether the sensitivity of acoustic sensors meets requirements during routine inspections. Acoustic sensor calibrators, as professional instruments for testing the sensitivity of acoustic sensors, can effectively perform the testing and calibration of acoustic sensors.

[0006] Ensuring that the acoustic sensor receives stable and interference-free acoustic waves is a prerequisite for the realization of the acoustic sensor calibrator's functions. Utility Model Content

[0007] In view of this, the present invention provides a cavity structure for an acoustic wave sensor calibrator, which enables the acoustic wave sensor to receive stable, interference-free acoustic waves.

[0008] The technical solution of this utility model is: a cavity structure for an acoustic sensor calibrator, comprising: an upper flange, a sound-absorbing layer, a speaker mounting plate, and a speaker;

[0009] The upper flange, sound-absorbing layer and speaker mounting plate are stacked together by fasteners, and the speaker is installed on the lower end face of the speaker mounting plate.

[0010] The upper flange is used to place the acoustic sensor to be calibrated;

[0011] The upper flange and the sound-absorbing layer have circular holes for accommodating the microphone of the acoustic sensor to be calibrated.

[0012] A circular hole is made on the speaker mounting plate at the position corresponding to the speaker.

[0013] In a preferred embodiment of this invention, a limiting groove is provided on the upper surface of the upper flange to limit the movement of the acoustic sensor.

[0014] In a preferred embodiment of this invention, the circular hole for accommodating the microphone is coaxial with the circular hole on the speaker mounting plate, so that the microphone and the speaker are concentric.

[0015] In a preferred embodiment of this utility model, an isolation column is provided in the fastener mounting hole on the sound-absorbing layer.

[0016] In a preferred embodiment of this utility model, the circular holes on the speaker mounting plate are horn-shaped with increasing diameter from bottom to top.

[0017] In a preferred embodiment of this invention, the sound-absorbing layer is made of high-density sponge.

[0018] Beneficial effects:

[0019] (1) The cavity structure of the acoustic wave sensor calibrator of this utility model is provided with a sound-absorbing layer, which can not only reduce the wave boost caused by reflection, but also absorb external noise and avoid interference to the acoustic wave sensor, so that the acoustic wave sensor can collect stable and interference-free sound waves and ensure the accuracy of calibration.

[0020] (2) In the cavity structure of the acoustic sensor calibrator of this utility model, an isolation column is provided in the fastener mounting hole of the sound-absorbing layer, which can isolate the upper flange and the speaker mounting plate from squeezing the sponge, maintain the shape of the sound-absorbing layer, and avoid deformation affecting the sound absorption effect.

[0021] (3) In the cavity structure of the acoustic sensor calibrator of this utility model, a limiting groove coaxial with its central circular hole is opened on the upper surface of the upper flange to limit the acoustic sensor and at the same time make the microphone and the speaker concentric. Attached Figure Description

[0022] Figure 1 This is an exploded view of the cavity structure of the acoustic wave sensor calibrator of this utility model;

[0023] Figure 2 This is a front sectional view of the cavity structure of the acoustic wave sensor calibrator of this utility model;

[0024] Figure 3 This is a schematic diagram of a speaker mounting plate;

[0025] Figure 4 This is a schematic diagram of the working principle of the acoustic wave sensor calibrator of this utility model;

[0026] Among them: 1-fastener, 2-upper flange, 3-isolation column, 4-sound absorption layer, 5-speaker mounting plate, 6-speaker, 7-microphone, 8-sound wave, 9-sound wave sensor. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] This embodiment provides a calibrator cavity structure that enables an acoustic wave sensor to receive stable, interference-free acoustic waves.

[0029] like Figure 1 and Figure 2 As shown, the cavity structure of the calibrator includes: an upper flange 2, a sound-absorbing layer 4, a speaker mounting plate 5, and a speaker 6.

[0030] The upper flange 2, the sound-absorbing layer 4, and the speaker mounting plate 5 are stacked together by fasteners 1 (such as screws), and the speaker 6 is fixedly installed on the lower end face of the speaker mounting plate 5.

[0031] The upper flange 2 is used to place the acoustic wave sensor 9 to be calibrated; a circular hole is opened between the upper flange 2 and the sound-absorbing layer 4 to accommodate the microphone 7 of the acoustic wave sensor 9 to be calibrated; the size of the opening is as close as possible to the diameter of the microphone 7 so that the microphone 7 can fully receive the sound waves emitted by the speaker 6; the microphone 7 is used to convert the received sound signal into an electrical signal.

[0032] The upper flange 2 has a limiting groove on its upper surface that is coaxial with its central circular hole, which limits the position of the acoustic sensor 9 and makes the microphone 7 and the speaker 6 concentric.

[0033] The sound-absorbing layer 4 is disposed between the upper flange 2 and the speaker mounting plate 5. The sound-absorbing layer 4 is made of high-density sponge. The many small pores in the high-density sponge material can effectively guide the sound waves in and cause them to be reflected and rubbed multiple times inside the material, thereby converting the energy of the sound waves into tiny heat. This energy dissipation makes the sound waves unable to be reflected and echoed, thus achieving the effect of sound absorption.

[0034] The isolation column 3 is installed in the fastener mounting hole of the sound-absorbing layer 4 to isolate the upper flange 2 and the speaker mounting plate 5 from the compression of the sponge, maintain the shape of the sound-absorbing layer 4, and avoid deformation that would affect the sound absorption effect.

[0035] like Figure 3 As shown, the speaker mounting plate 5 has a central circular hole, which matches the dimensions of the speaker 6 end face.

[0036] As an example, based on acoustic principles, the speaker mounting plate 5 has a conical opening (i.e., a horn shape with increasing diameter from bottom to top). This structure helps to concentrate sound wave energy, improve sound propagation efficiency, and reduce energy loss during propagation, resulting in clearer and louder sound. Simultaneously, this structure can adapt to different sound wave frequencies. Since different frequencies have different wavelengths, this structure can be optimized for different frequencies to achieve a flatter frequency response.

[0037] Since the speaker mounting plate 5 is relatively thin, the cone shape at this point can be approximated as a cylinder during actual processing.

[0038] The working principle of this calibrator is as follows: Figure 4 As shown, during operation, the acoustic wave sensor 9 to be calibrated is placed on the limiting groove of the upper flange 2, with the microphone 7 of the acoustic wave sensor 9 concentric with the calibrator cavity. At this time, the calibrator emits a built-in standard sound file through the speaker 6 for the acoustic wave sensor 9 to collect. The sound wave 8 emitted by the speaker 6 passes through the speaker mounting plate 5, and the portion of the sound wave directly facing the microphone 7 continues to be collected by the acoustic wave sensor 9 through the sound-absorbing layer 4 and the opening of the upper flange 2. The remaining sound wave is absorbed by the sound-absorbing layer 4, reducing the auxiliary wave caused by reflection. At the same time, the sound-absorbing layer 4 can absorb external noise, avoiding interference to the acoustic wave sensor 9, thereby enabling the acoustic wave sensor to collect stable and interference-free sound waves, ensuring the accuracy of the calibration.

[0039] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. The cavity structure of an acoustic wave sensor calibrator, characterized in that: The utility model relates to a sound wave sensor calibration device, including: Upper flange (2), sound absorption layer (4), loudspeaker mounting plate (5) and loudspeaker (6); The upper flane (2), sound absorption layer (4) and loudspeaker mounting plate (5) are installed together through fastener (1), and the loudspeaker (6) is installed at the lower end surface of loudspeaker mounting plate (5); The upper flange (2) is used to place the sound wave sensor (9) to be calibrated; Circular holes are formed on the upper flange (2) and sound absorption layer (4) to accommodate the microphone (7) of the sound wave sensor (9) to be calibrated; Circular holes are formed on the loudspeaker mounting plate (5) corresponding to the loudspeaker (6).

2. The acoustic wave sensor checkweigher cavity structure of claim 1 wherein, Limiting grooves are arranged on the upper surface of the upper flange (2) to limit the sound wave sensor (9).

3. A cavity structure for an acoustic wave sensor prover as claimed in claim 1 or 2, wherein, The circular hole for accommodating the microphone (7) is coaxial with the circular hole on the loudspeaker mounting plate (5), so that the microphone (7) is concentric with the loudspeaker (6).

4. The acoustic wave sensor prover cavity structure of claim 1 or 2, wherein, An isolation column (3) is arranged in the fastener mounting hole on the sound absorption layer (4).

5. The acoustic wave sensor prover cavity structure of claim 1 or 2, wherein, The circular hole formed on the loudspeaker mounting plate (5) is a horn shape with increasing diameter from bottom to top.

6. The acoustic wave sensor prover cavity structure of claims 1 or 2, wherein, The sound absorption layer (4) is made of high-density sponge.

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