CN215595959U - Silencer of axial flow fan - Google Patents

Silencer of axial flow fan Download PDF

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Publication number
CN215595959U
CN215595959U CN202122286627.6U CN202122286627U CN215595959U CN 215595959 U CN215595959 U CN 215595959U CN 202122286627 U CN202122286627 U CN 202122286627U CN 215595959 U CN215595959 U CN 215595959U
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silencing
fan shell
sound
fan
motor
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CN202122286627.6U
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Chinese (zh)
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丰庆国
安冉
范兰
章亚振
乐成芝
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Yancheng Lanfeng Environmental Engineering Technology Co Ltd
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Yancheng Lanfeng Environmental Engineering Technology Co Ltd
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Abstract

The utility model discloses a silencer of an axial flow fan, which comprises a fan shell, a motor sound-proof cover, a resonance silencer, a front fan shell, a streamline silencing cover, a rear fan shell, a waveform silencing inner cylinder and a waveform silencing outer cylinder, wherein the resonance silencer is arranged on the inner side wall of the fan shell, the motor sound-proof cover is arranged on the periphery of a motor, the tapered streamline silencing cover is arranged at the axis of the front fan shell, and the waveform silencing inner cylinder and the waveform silencing outer cylinder are arranged in the rear fan shell. The utility model is designed by combining the aerodynamic and acoustic principles, the noise reduction structures are arranged on the inner and outer cylinders of the axial flow fan, and the corresponding noise reduction structures are arranged in the guide cylinders in front of and behind the fan, so that the mechanical noise caused by the rotation of the motor and the aerodynamic noise generated when the impeller generates vortex are effectively reduced, the noise reduction effect is obvious, the integral noise volume generated by the fan is greatly reduced, the harm of the noise to a human body is reduced, and the external environment is protected.

Description

Silencer of axial flow fan
Technical Field
The utility model relates to the technical field of silencing of pipeline fans, in particular to a silencing device for an axial flow fan.
Background
The axial-flow fan is the most common ventilation and air supply equipment in the market at present, and the air flows parallel to the fan shaft, namely the air flow in the same direction with the shaft of the fan blade, and the air volume and the pressure of the fan in each suction and discharge process have sudden change phenomena, so that great noise is generated. According to the forming mechanism of fan noise, the fan noise mainly comprises mechanical noise and pneumatic noise, wherein the pneumatic noise accounts for a great proportion in noise composition, and the pneumatic noise mainly comprises pulsation noise of return gas at an exhaust end. When the fan exhausts, high-pressure gas can flow back when the element volume is opened, and the high-pressure gas flows back into the element volume instantly to cause extremely strong vortex disturbance, so that the flow rate is extremely high, the energy is extremely high, and the noise is extremely strong. Noise is harmful to human health, influences external environment, is unfavorable for the protection of environment, and some enterprises often adopt and come the noise abatement at fan casing outside cladding noise cancelling material, but because fan both ends diameter itself is great, the noise that the both ends were dispersed is also great, and only outside cladding noise cancelling material effect is limited. Therefore, how to reduce the high noise pollution of the axial-flow fan is an urgent problem to be solved. In order to solve these technical problems, scientific research units and scientific personnel of enterprises are continuously researching and exploring, and the modern science and technology is used to improve and innovate, and though the technology is advanced, the technical problem which is not overcome in the practical application still exists.
Disclosure of Invention
The utility model aims to provide a silencer of an axial flow fan, which is designed by combining aerodynamics and acoustic principles, wherein silencing structures are arranged on an inner cylinder and an outer cylinder of the axial flow fan, and corresponding silencing structures are arranged in guide cylinders in front of and behind the fan, so that mechanical noise caused by rotation of a motor and pneumatic noise generated when an impeller generates vortex are effectively reduced, the noise reduction effect is obvious, the integral noise volume generated by the fan is greatly reduced, the harm of noise to a human body is reduced, and the external environment is protected.
The technical scheme adopted by the utility model for solving the technical problems is as follows: an axial flow fan silencing device comprises a fan shell, a motor sound-proof cover, an impeller, a motor, a resonance silencing device, a tower-shaped silencing plate, an outer silencing cylinder, sound-absorbing fiber cotton, an inner silencing cylinder, a front fan shell, a streamline silencing cover, a rear fan shell, a waveform silencing inner cylinder and a waveform silencing outer cylinder, wherein the fan shell is cylindrical, the inner side wall of the fan shell is provided with the resonance silencing device, the resonance silencing device is of a double-layer cavity circular structure and mainly comprises the tower-shaped silencing plate and the silencing cylinder, the tower-shaped silencing plate is arranged in a manner of being attached to the inner wall of the fan shell, the inner side of the tower-shaped silencing plate is provided with the silencing cylinder, a cavity is reserved between the tower-shaped silencing plate and the silencing cylinder, the silencing cylinder is composed of the inner silencing cylinder and the outer silencing cylinder, and the sound-absorbing fiber cotton is filled between the inner silencing cylinder and the outer silencing cylinder; the motor is arranged in the fan shell, an impeller is arranged on a rotating shaft of the motor, a motor sound-proof cover is arranged on the periphery of the motor and is formed by welding steel plates, a tower-shaped sound-absorbing plate is attached to the inner wall of the motor sound-proof cover, and a ventilation pipe is also arranged on the motor sound-proof cover and penetrates between the fan shell and the motor sound-proof cover and is communicated with the outside atmosphere; the inlet end and the outlet end of the fan shell are respectively provided with a front fan shell and a rear fan shell, the outer diameters of the front fan shell and the rear fan shell are the same as those of the fan shell and are sequentially and fixedly connected through a flange, a conical streamline silencing cover is arranged at the axis of the front fan shell, sound-absorbing cellucotton is filled in the streamline silencing cover, and a resonance silencing device is attached to the inner wall of the front fan shell; the rear fan shell is internally provided with a waveform silencing inner cylinder and a waveform silencing outer cylinder, the waveform silencing outer cylinder is arranged close to the rear fan shell, a gap is reserved between the waveform silencing outer cylinder and the rear fan shell, sound-absorbing cellucotton is filled in the gap, the waveform silencing inner cylinder is axially arranged along the axis of the rear fan shell, the sound-absorbing cellucotton is filled in the waveform silencing inner cylinder, and an annular wavy flow channel is formed between the waveform silencing inner cylinder and the waveform silencing outer cylinder.
Preferably, a plurality of tower-shaped silencing blocks are arranged on the tower-shaped silencing plate, the silencing blocks are hollow, and sound-absorbing fiber cotton fragments are filled in the silencing blocks.
Preferably, the inner silencing barrel and the outer silencing barrel are both formed by rolling micro-perforated plates.
The technical principle adopted by the utility model for solving the technical problems is as follows: the utility model is designed by combining the aerodynamic principle and the acoustic principle, the inner wall of the fan shell of the axial flow fan is provided with a resonance silencing device, the noise of air flow during the operation of the fan is radiated to the inner wall of the air duct and enters the first layer of sound-absorbing fiber cotton through the micro-perforations on the inner silencing tube, the noise is transmitted among the superfine fibers and absorbs part of the noise, the rest noise penetrates through the sound-absorbing fiber cotton and enters the annular cavity through the micro-perforations on the outer silencing tube, the noise is suddenly changed from small-section transmission to large-section transmission, the sound wave is changed, the noise is continuously diffused to the outside and enters the tower-shaped silencing plate attached to the inner wall of the fan shell, the wind speed sound is circularly collided among gaps of the tower-shaped inner wall, and the sound-absorbing block is arranged in the tower-shaped silencing plate, so that the radiation noise of the air flow is reduced to the lowest.
The motor sound-proof housing sets up outside the motor, makes motor and the interior air current of runner keep apart, and the sound-proof housing inner wall pastes the turriform acoustical panel, can keep apart the mechanical noise that the motor operation in-process produced. The motor sound-proof housing is provided with a ventilation pipe which is communicated with the outside atmosphere, so that the heat dissipation problem of the motor is solved.
The front fan shell mainly guides air flow at an air inlet into the main ventilator, and the inner wall of the front fan shell is provided with a resonance silencing device and a streamline silencing cover for reducing noise at the air inlet when the ventilator runs.
The rear fan shell is internally provided with a waveform silencing inner cylinder and a waveform silencing outer cylinder, sound-absorbing cellucotton is filled between the rear fan shell and the waveform silencing outer cylinder to form the silencing outer cylinder, the waveform silencing inner cylinder is filled with the sound-absorbing cellucotton and then is arranged at the central position of the rear fan shell, the flow channel is made into a gradually expanding-gradually reducing circulating expanded streamline annular wavy flow channel according to the characteristics of airflow sound waves at the outlet of the ventilator, and a primary expansion chamber and a secondary expansion chamber … … are formed in the flow channel, airflow noise enters the primary expansion chamber from the outlet of the ventilator, the flow speed is reduced, the airflow noise is contacted with the sound-absorbing fiber cotton in the cylinder wall, then enters the secondary expansion chamber after the end surface is reduced, the sound wave is continuously changed through the change of the air flow velocity, further, the noise of the air flow is attenuated continuously, and the noise of the outlet of the air flow is naturally reduced to the minimum under the action of the sound-absorbing cellucotton.
Compared with the prior art, the utility model has the beneficial effects that:
adopt pneumatics and acoustics principle to combine together the design and form, all set up the amortization structure on axial fan inside and outside barrel, also be provided with corresponding amortization structure in the draft tube around the fan simultaneously, and then reduced the mechanical noise that the motor rotated and caused and the aerodynamic noise who produces when producing the vortex because of the impeller effectively, and the noise reduction effect is obvious, has reduced the whole noise volume that the fan produced greatly, and noise abatement is to the harm of human body, has protected external environment.
1. The double-layer silencing device is arranged at the shell section of the fan, the inner-layer motor sound-proof cover can isolate mechanical noise generated in the motor operation process, and the outer-layer resonance silencing device reduces the radiation noise of airflow to the minimum through the silencing barrel and the tower-shaped silencing plate.
2. The utility model arranges a wave-shaped silencer in the rear fan shell, the wave-shaped gas flow channel can reduce the flow speed, the sound wave is continuously changed by the change of the flow speed of the air flow, the noise of the air flow is further continuously attenuated, and the outlet noise of the air flow is reduced to the lowest under the action of the sound-absorbing cellucotton.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an enlarged view of the structure at A of the present invention;
FIG. 3 is a schematic view of the sound enclosure structure of the motor of the present invention;
FIG. 4 is a schematic view of the internal structure of the front fan housing of the present invention;
FIG. 5 is a schematic view of the internal structure of the rear fan housing of the present invention;
in the figure: 1. a fan housing; 2. a motor sound-proof housing; 21. a vent pipe; 3. an impeller; 4. a motor; 5. a resonance silencer; 51. a tower-shaped silencing plate; 52. an outer noise reduction cylinder; 53. sound-absorbing cellucotton; 54. an inner noise reduction cylinder; 6. a front-mounted fan housing; 61. a streamlined noise damping cover; 7. a rear fan housing; 71. a waveform silencing inner cylinder; 72. a waveform silencing outer cylinder; 73. an annular wavy flow passage.
Detailed Description
The utility model is further described below with reference to the following figures and examples:
in fig. 1-5, the utility model provides a silencer of an axial-flow fan, comprising a fan shell 1, a motor sound-proof cover 2, a ventilation pipe 21, an impeller 3, a motor 4, a resonance silencer 5, a tower-shaped silencer 51, an outer silencer cylinder 52, sound-absorbing fiber cotton 53, an inner silencer cylinder 54, a front fan shell 6, a streamline silencer 61, a rear fan shell 7, a waveform silencer inner cylinder 71, a waveform silencer outer cylinder 72 and an annular waveform runner 73, wherein the fan shell 1 is cylindrical, the inner side wall of the fan shell is provided with the resonance silencer 5, the resonance silencer 5 is a double-layer cavity circular structure and mainly comprises the tower-shaped silencer 51 and the silencer cylinder, the tower-shaped silencer 51 is provided with a plurality of tower-shaped silencer blocks, the silencer blocks are hollow and filled with the sound-absorbing fiber cotton fragments 53, the tower-shaped silencer block 51 is arranged in a manner of being attached to the inner wall of the fan shell 1, the inner side of the tower-shaped silencer block 51 is provided with the silencer cylinder, a cavity is reserved between the tower-shaped silencing plate 51 and the silencing cylinder, the silencing cylinder is composed of an inner silencing cylinder 54 and an outer silencing cylinder 52, the inner silencing cylinder 54 and the outer silencing cylinder 52 are formed by rolling micro-perforated plates, and the silencing fiber cotton 53 is filled between the inner silencing cylinder 54 and the outer silencing cylinder 52. The inner wall of the fan shell 1 is provided with a resonance silencing device 5, air flow noise generated when a fan operates radiates to the inner wall of the air duct, the air flow noise enters the first layer of sound-absorbing fiber cotton 53 through micro-perforations on the inner silencing cylinder 54, the noise is transmitted among superfine fibers and part of the noise is absorbed, residual noise penetrates through the sound-absorbing fiber cotton and then enters the annular cavity through the micro-perforations on the outer silencing cylinder 52, the noise is suddenly changed from small-section transmission to large-section transmission, sound waves are changed, the noise is continuously diffused towards the outside to enter the tower-shaped silencing board 51 attached to the inner wall of the fan shell 1, wind speed sound circularly collides in gaps of the tower-shaped inner wall, the tower-shaped silencing board 51 is internally provided with sound-absorbing blocks, and the radiation noise of the air flow is reduced to the minimum.
A motor 4 is arranged in a fan shell 1, an impeller 3 is arranged on a rotating shaft of the motor 4, a motor sound-proof cover 2 is arranged on the periphery of the motor 4, the motor sound-proof cover 2 is formed by welding steel plates, a tower-shaped sound-absorbing plate 51 is attached to the inner wall of the motor sound-proof cover 2, and the motor sound-proof cover 2 can isolate mechanical noise generated in the operation process of the motor 4; the motor sound-proof housing 2 is also provided with a ventilation pipe 21, the ventilation pipe 21 penetrates between the fan shell 1 and the motor sound-proof housing 2 and is communicated with the outside atmosphere, and the ventilation pipe is communicated with the outside atmosphere, so that the heat dissipation problem of the motor can be solved, and the service life of the motor is prolonged.
The inlet end and the outlet end of the fan shell 1 are respectively provided with a front fan shell 6 and a rear fan shell 7, the outer diameters of the front fan shell 6 and the rear fan shell 7 are the same as the outer diameter of the fan shell 1 and are sequentially and fixedly connected through flanges, a conical streamline noise reduction cover 61 is installed at the axis of the front fan shell 6, sound absorption cellucotton 53 is filled in the streamline noise reduction cover 61, and a resonance noise reduction device 5 is attached to the inner wall of the front fan shell 6; the front fan shell 6 mainly guides air flow at an air inlet to enter the main ventilator, and the inner wall of the front fan shell 6 is provided with a resonance silencing device 5 and a streamline silencing cover 61 for reducing noise at the air inlet when the ventilator runs.
The rear fan shell 7 is internally provided with a waveform silencing inner cylinder 71 and a waveform silencing outer cylinder 72, the waveform silencing outer cylinder 72 is arranged close to the rear fan shell 7, a gap is reserved between the waveform silencing outer cylinder 72 and the rear fan shell 7, sound absorbing cellucotton 53 is filled in the gap, the waveform silencing inner cylinder 71 is axially arranged along the axis of the rear fan shell 7, the sound absorbing cellucotton 53 is filled in the waveform silencing inner cylinder 71, and an annular wavy flow channel 73 is formed between the waveform silencing inner cylinder 71 and the waveform silencing outer cylinder 72. The flow channel is made into a gradually expanding-gradually reducing circulating expanded streamline annular wavy flow channel according to the airflow sound wave point at the outlet of the ventilator, a primary expansion chamber and a secondary expansion chamber … … are formed in the flow channel, airflow noise enters the primary expansion chamber from the outlet of the ventilator, the flow speed is reduced, the airflow noise is in contact with sound-absorbing cellucotton inside the cylinder wall, then the airflow noise enters the secondary expansion chamber after being reduced through the end face, the sound wave is continuously changed through the change of the airflow flow speed, the airflow noise is continuously attenuated, and the outlet noise of the airflow is naturally reduced to the minimum under the action of the sound-absorbing cellucotton.

Claims (3)

1. The utility model provides an axial-flow fan silencing device, includes fan casing, motor sound-proof housing, impeller, motor, resonance silencing device, turriform acoustical panel, outer amortization barrel, inhales the sound cellucotton, interior amortization barrel, leading fan casing, streamlined acoustical housing, rearmounted fan casing, wave form amortization inner tube, wave form amortization urceolus, its characterized in that: the fan shell is cylindrical, a resonance silencing device is arranged on the inner side wall of the fan shell, the resonance silencing device is of a double-layer cavity circular structure and mainly comprises a tower-shaped silencing plate and a silencing barrel, the tower-shaped silencing plate is arranged in the fan shell in a manner of being attached to the inner wall of the fan shell, the silencing barrel is arranged on the inner side of the tower-shaped silencing plate, a cavity is reserved between the tower-shaped silencing plate and the silencing barrel, the silencing barrel consists of an inner silencing barrel body and an outer silencing barrel body, and sound-absorbing fiber cotton is filled between the inner silencing barrel body and the outer silencing barrel body; the motor is arranged in the fan shell, an impeller is arranged on a rotating shaft of the motor, a motor sound-proof cover is arranged on the periphery of the motor and is formed by welding steel plates, a tower-shaped sound-absorbing plate is attached to the inner wall of the motor sound-proof cover, and a ventilation pipe is also arranged on the motor sound-proof cover and penetrates between the fan shell and the motor sound-proof cover and is communicated with the outside atmosphere; the inlet end and the outlet end of the fan shell are respectively provided with a front fan shell and a rear fan shell, the outer diameters of the front fan shell and the rear fan shell are the same as those of the fan shell and are sequentially and fixedly connected through a flange, a conical streamline silencing cover is arranged at the axis of the front fan shell, sound-absorbing cellucotton is filled in the streamline silencing cover, and a resonance silencing device is attached to the inner wall of the front fan shell; the rear fan shell is internally provided with a waveform silencing inner cylinder and a waveform silencing outer cylinder, the waveform silencing outer cylinder is arranged close to the rear fan shell, a gap is reserved between the waveform silencing outer cylinder and the rear fan shell, sound-absorbing cellucotton is filled in the gap, the waveform silencing inner cylinder is axially arranged along the axis of the rear fan shell, the sound-absorbing cellucotton is filled in the waveform silencing inner cylinder, and an annular wavy flow channel is formed between the waveform silencing inner cylinder and the waveform silencing outer cylinder.
2. The axial flow fan noise reduction device of claim 1, wherein: the tower-shaped silencing plate is provided with a plurality of tower-shaped silencing blocks, the silencing blocks are hollow, and sound-absorbing fiber cotton fragments are filled in the silencing blocks.
3. The axial flow fan noise reduction device of claim 1, wherein: the inner silencing barrel and the outer silencing barrel are both formed by rolling micro-perforated plates.
CN202122286627.6U 2021-09-22 2021-09-22 Silencer of axial flow fan Active CN215595959U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122286627.6U CN215595959U (en) 2021-09-22 2021-09-22 Silencer of axial flow fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122286627.6U CN215595959U (en) 2021-09-22 2021-09-22 Silencer of axial flow fan

Publications (1)

Publication Number Publication Date
CN215595959U true CN215595959U (en) 2022-01-21

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Application Number Title Priority Date Filing Date
CN202122286627.6U Active CN215595959U (en) 2021-09-22 2021-09-22 Silencer of axial flow fan

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117329173A (en) * 2023-12-01 2024-01-02 南京磁谷科技股份有限公司 Air inlet noise reduction device of high-speed centrifugal compressor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117329173A (en) * 2023-12-01 2024-01-02 南京磁谷科技股份有限公司 Air inlet noise reduction device of high-speed centrifugal compressor
CN117329173B (en) * 2023-12-01 2024-04-12 南京磁谷科技股份有限公司 Air inlet noise reduction device of high-speed centrifugal compressor

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