CN113457958A - Pressure wave generating device based on fan - Google Patents
Pressure wave generating device based on fan Download PDFInfo
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- CN113457958A CN113457958A CN202110785124.5A CN202110785124A CN113457958A CN 113457958 A CN113457958 A CN 113457958A CN 202110785124 A CN202110785124 A CN 202110785124A CN 113457958 A CN113457958 A CN 113457958A
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- air outlet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/20—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of a vibrating fluid
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Abstract
The invention discloses a pressure wave generating device based on a fan, which comprises a rack, an axial flow fan, a controller and an air outlet structure, wherein the axial flow fan is arranged on the rack; the axial flow fan and the controller are both arranged on the rack, the controller is connected with the axial flow fan, and the rotating speed of the axial flow fan is controlled through PWM pulse width signals or pulse number PTO signals; the air outlet structure is a cavity structure with two open ends, one end of the air outlet structure is an air inlet end, the other end of the air outlet structure is an air outlet end, and the diameter of the air outlet end is larger than that of the air inlet end, so that the air outlet structure is integrally in a horn-shaped structure; the air inlet end of the air outlet structure is connected with the air outlet end of the axial flow fan. The invention can generate pressure wave signals of sine and the like in the atmospheric environment, can be used for researching infrasound transmission mechanism, testing noise reduction effect of a noise reduction device and calibrating a low-frequency pressure wave sensor, and the low-frequency pressure wave signals generated by the pressure wave generating device can also be used in the fields of bird repelling and the like.
Description
Technical Field
The invention relates to the technical field of pressure waves, in particular to a pressure wave generating device based on a fan.
Background
In the process of acoustic research and application, a low-frequency pressure wave generator mostly has small sound pressure and transmits pressure wave signals in a closed space. In the use of low frequency pressure wave sensors, noise reduction devices are often used to reduce ambient noise. However, this device cannot meet the performance test requirements of the noise reduction device and cannot meet the requirements for performing pressure wave signal tests in the atmosphere. In addition, the air path acoustic resistance caused by the connection of the pressure wave generator and the pressure wave sensor in the closed space easily causes the deviation between the sensor test and the real pressure wave signal.
Therefore, it is necessary to design a pressure wave generating device used in the atmosphere to realize the pressure wave signal test in the atmosphere.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the problem that the existing pressure wave generating device can only transmit pressure wave signals in a closed space and cannot be used in the atmosphere, and provides a pressure wave generating device based on a fan, which can generate sinusoidal pressure wave signals and the like in the atmospheric environment, can be used for researching infrasound transmission mechanism, testing noise reduction effect of a noise reduction device and calibrating a low-frequency pressure wave sensor, and the low-frequency pressure wave signals generated by the pressure wave generating device can also be used in the fields of bird repelling and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
a pressure wave generating device based on a fan comprises a rack, an axial flow fan, a controller and an air outlet structure; the axial flow fan and the controller are both arranged on the rack, the controller is connected with the axial flow fan, and the rotating speed of the axial flow fan is controlled through PWM pulse width signals or pulse number PTO signals; the air outlet structure is a cavity structure with two open ends, one end of the air outlet structure is an air inlet end, the other end of the air outlet structure is an air outlet end, and the diameter of the air outlet end is larger than that of the air inlet end, so that the air outlet structure is integrally in a horn-shaped structure; the air inlet end of the air outlet structure is connected with the air outlet end of the axial flow fan.
The air conditioner is provided with a rack, an axial flow fan, a controller and an air outlet structure; the axial flow fan and the controller are both arranged on the rack, the controller is connected with the axial flow fan, and the rotating speed of the axial flow fan is controlled through PWM pulse width signals or pulse number PTO signals; the whole air outlet structure is of a horn-shaped structure, the air inlet end of the air outlet structure is connected with the air outlet end of the axial flow fan, therefore, the controller realizes waveform sine wave change through PWM pulse width signals or pulse number PTO signals, the motor is driven to rotate according to the PWM pulse width or pulse number which is changed according to the sine wave, the motor is controlled to rotate according to the change of the waveform of a built-in program, the rotation speed of the axial flow fan is controlled, the change of air flow is generated, and therefore pressure fluctuation signals with different frequencies are achieved. These pressure wave signals are exported through the structure of giving vent to anger of tubaeform, and the tubaeform can make the wave form more smooth and play the effect that the low frequency pressure wave was enlargied to the realization produces pressure wave signals such as sine in atmospheric environment.
The device is used for producing pressure wave signals in the atmosphere, produce pressure wave signals in with traditional airtight space and compare the true condition that more can reflect pressure wave signals in the atmosphere, the influence that the gas circuit acoustic resistance and the cavity that has avoided bringing because airtight space pressure wave generating device and pressure wave sensor connector produced resonance etc. and brought is and airtight space and sensor enter the sound chamber volume ratio less, the sensitivity test that brings is on the low side, thereby the deviation between sensor test condition and the true pressure wave signals has been avoided. The low-frequency pressure wave signal generated by the device can be spread for a long distance in the air, a secondary sound wave source is simulated, the low-frequency pressure wave signal can be emitted by an array formed by pressure wave sensors for positioning analysis of the pressure wave signal source, infrasound transmission mechanism research, noise reduction effect test of a noise reduction device and low-frequency pressure wave sensor calibration, and the low-frequency pressure wave signal can also be emitted (0.1 Hz-20 Hz), and the low-frequency pressure wave signal can be used in the fields of bird repelling and the like.
Further, the axial flow fan comprises a motor and blades; the motor is provided with a motor shaft, and the axial direction of the motor shaft and the axial direction of the air outlet structure are positioned on the same straight line; the blades are arranged on the motor shaft and can synchronously rotate along with the motor shaft. Therefore, when the controller controls the motor to rotate and outputs corresponding waveforms, the blades are driven to rotate, and corresponding pressure wave signals are sent.
Further, the air inlet end and the air outlet end of the air outlet structure are respectively sealed by a protection plate; the protective plate is provided with honeycomb holes. Like this, the protection network through having honeycomb holes will give vent to anger the inlet end of structure and give vent to anger the end and seal, avoid the foreign matter to get into the structure of giving vent to anger in, improve the device's reliability.
Further, the axial flow fan is a high-power axial flow fan, the power of the axial flow fan is larger than 5kW, the larger the power is, the larger the pressure wave energy is sent out, and a pressure wave signal with high pressure intensity can be generated.
Furthermore, the included angle between the air outlet end of the air outlet structure and the axial lead is 60-70 degrees, so that the output of pressure wave signals is facilitated.
Compared with the prior art, the invention has the following advantages:
1. the air conditioner is provided with a rack, an axial flow fan, a controller and an air outlet structure; the axial flow fan and the controller are both arranged on the rack, the controller is connected with the axial flow fan, and the rotating speed of the axial flow fan is controlled through PWM pulse width signals or pulse number PTO signals; the whole air outlet structure is of a horn-shaped structure, the air inlet end of the air outlet structure is connected with the air outlet end of the axial flow fan, therefore, the controller realizes waveform sine wave change through PWM pulse width signals or pulse number PTO signals, the motor is driven to rotate according to the PWM pulse width or pulse number which is changed according to the sine wave, the motor is controlled to rotate according to the change of the waveform of a built-in program, the rotation speed of the axial flow fan is controlled, the change of air flow is generated, and therefore pressure fluctuation signals with different frequencies are achieved. These pressure wave signals are exported through the structure of giving vent to anger of tubaeform, and the tubaeform can make the wave form more smooth and play the effect that the low frequency pressure wave was enlargied to the realization produces pressure wave signals such as sine in atmospheric environment.
2. The device is used for producing pressure wave signals in the atmosphere, produce pressure wave signals in with traditional airtight space and compare the true condition that more can reflect pressure wave signals in the atmosphere, the influence that the gas circuit acoustic resistance and the cavity that has avoided bringing because airtight space pressure wave generating device and pressure wave sensor connector produced resonance etc. and brought is and airtight space and sensor enter the sound chamber volume ratio less, the sensitivity test that brings is on the low side, thereby the deviation between sensor test condition and the true pressure wave signals has been avoided. The low-frequency pressure wave signal generated by the device can be spread for a long distance in the air, a secondary sound wave source is simulated, the low-frequency pressure wave signal can be emitted by an array formed by pressure wave sensors for positioning analysis of the pressure wave signal source, infrasound transmission mechanism research, noise reduction effect test of a noise reduction device and low-frequency pressure wave sensor calibration, and the low-frequency pressure wave signal can also be emitted (0.1 Hz-20 Hz), and the low-frequency pressure wave signal can be used in the fields of bird repelling and the like.
Drawings
Fig. 1 is a schematic structural diagram of a pressure wave generator based on a fan according to the present invention.
Fig. 2 is a right side view of fig. 1.
Fig. 3 is a cross-sectional view of a fan-based pressure wave generator of the present invention.
In the figure: the air conditioner comprises a frame 1, an axial flow fan 2, a controller 3 and an air outlet structure 4.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Example (b):
referring to fig. 1-3, a blower-based pressure wave generator includes a frame 1, an axial flow blower 2, a controller 3, and an air outlet structure 4. The axial flow fan 2 and the controller 3 are both arranged on the frame 1, the controller 3 is connected with the axial flow fan 2, and the rotating speed of the axial flow fan 2 is controlled through PWM pulse width signals or pulse number PTO signals. The air outlet structure 4 is a cavity structure with two open ends, one end of the air outlet structure is an air inlet end, the other end of the air outlet structure is an air outlet end, and the diameter of the air outlet end is larger than that of the air inlet end, so that the air outlet structure 4 is of a horn-shaped structure as a whole. The air inlet end of the air outlet structure 4 is connected with the air outlet end of the axial flow fan 2. In practice, the axial fan 2 comprises a motor and blades. The motor is provided with a motor shaft, and the axial direction of the motor shaft and the axial direction of the air outlet structure 4 are positioned on the same straight line. The blades are arranged on the motor shaft and can synchronously rotate along with the motor shaft. Therefore, when the controller 3 controls the motor to rotate and outputs corresponding waveforms, the blades are driven to rotate, and corresponding pressure wave signals are sent. The axial flow fan 2 is a high-power axial flow fan 2, the power of the axial flow fan is larger than 5kW, the larger the power is, the larger the pressure wave energy is sent out, and a pressure wave signal with high pressure intensity can be generated. The included angle between the air outlet end of the air outlet structure 4 and the axial lead is 60-70 degrees, and the output of pressure wave signals is facilitated. And the air inlet end and the air outlet end of the air outlet structure 4 are respectively sealed by a protection plate. The protective plate is provided with honeycomb holes. Like this, the protection network through having honeycomb holes seals the inlet end and the end of giving vent to anger structure 4, avoids in the foreign matter gets into the structure 4 of giving vent to anger, improves the device's reliability.
The axial flow fan and the controller are mounted on the frame through the arrangement of the frame, the controller is connected with the axial flow fan and controls the rotating speed of the axial flow fan through PWM pulse width signals or pulse number PTO signals, the air outlet structure is integrally of a horn-shaped structure, and the air inlet end of the air outlet structure is connected with the air outlet end of the axial flow fan. The pressure wave signals are output through the trumpet-shaped air outlet structure, the trumpet shape can enable the waveform to be smoother and plays a role in waveform amplification, and therefore the pressure wave signals such as sine waves are generated in the atmospheric environment.
The device is used for generating pressure wave signals in the atmosphere, and compared with pressure wave signals generated in a traditional closed space, the device can better reflect the real condition of the pressure wave signals in the atmosphere, and avoids gas path acoustic resistance caused by the connection of the pressure wave generating device and the pressure wave sensor in the closed space, thereby avoiding the deviation between the test condition of the sensor and the real pressure wave signals. The low-frequency pressure wave signal generated by the device can be spread for a long distance in the air, can simulate a secondary sound wave source and the like, is used for positioning analysis of an array formed by the pressure ratio sensors on the pressure wave signal source, infrasound transmission mechanism research, noise reduction effect test of a noise reduction device and low-frequency pressure wave sensor calibration, can also emit low-frequency (0.1 Hz-20 Hz) pressure wave signals, and can be used for the fields of bird repelling and the like.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (5)
1. A pressure wave generating device based on a fan is characterized by comprising a rack, an axial flow fan, a controller and an air outlet structure; the axial flow fan and the controller are both arranged on the rack, the controller is connected with the axial flow fan, and the rotating speed of the axial flow fan is controlled through PWM pulse width signals or pulse number PTO signals; the air outlet structure is a cavity structure with two open ends, one end of the air outlet structure is an air inlet end, the other end of the air outlet structure is an air outlet end, and the diameter of the air outlet end is larger than that of the air inlet end, so that the air outlet structure is integrally in a horn-shaped structure; the air inlet end of the air outlet structure is connected with the air outlet end of the axial flow fan.
2. The fan-based pressure wave generating apparatus of claim 1 wherein the axial fan comprises a motor and blades; the motor is provided with a motor shaft, and the axial direction of the motor shaft and the axial direction of the air outlet structure are positioned on the same straight line; the blades are arranged on the motor shaft and can synchronously rotate along with the motor shaft.
3. The fan-based pressure wave generating device of claim 1, wherein the air inlet end and the air outlet end of the air outlet structure are respectively closed by a protective plate; the protective plate is provided with honeycomb holes.
4. The fan-based pressure wave generating apparatus of claim 1 wherein the axial flow fan is a high power axial flow fan having a power greater than 5 kW.
5. The fan-based pressure wave generating device according to claim 1, wherein an included angle between the air outlet end of the air outlet structure and the axial line is 60-70 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110785124.5A CN113457958A (en) | 2021-07-12 | 2021-07-12 | Pressure wave generating device based on fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110785124.5A CN113457958A (en) | 2021-07-12 | 2021-07-12 | Pressure wave generating device based on fan |
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| CN113457958A true CN113457958A (en) | 2021-10-01 |
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| CN202110785124.5A Pending CN113457958A (en) | 2021-07-12 | 2021-07-12 | Pressure wave generating device based on fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984908A (en) * | 2021-10-31 | 2022-01-28 | 重庆建安仪器有限责任公司 | Pressure wave generating device |
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| CN1065818A (en) * | 1991-04-19 | 1992-11-04 | 屠勇 | Low-frequency sound wave exciting device |
| CN2170160Y (en) * | 1993-11-01 | 1994-06-29 | 韩铁 | Sound wave generator |
| CN2404006Y (en) * | 1999-11-30 | 2000-11-01 | 刘东旺 | Multifunction low-frequency sound-wave generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113984908A (en) * | 2021-10-31 | 2022-01-28 | 重庆建安仪器有限责任公司 | Pressure wave generating device |
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Application publication date: 20211001 |
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