CN111895474A - Range hood with noise reduction function - Google Patents
Range hood with noise reduction function Download PDFInfo
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- CN111895474A CN111895474A CN202010952991.9A CN202010952991A CN111895474A CN 111895474 A CN111895474 A CN 111895474A CN 202010952991 A CN202010952991 A CN 202010952991A CN 111895474 A CN111895474 A CN 111895474A
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- cavity
- noise
- range hood
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
Abstract
The invention discloses a noise-reducing range hood which comprises a case, a fan device and a first noise-reducing structure, wherein the case is provided with a smoke collecting cavity; the fan device is arranged in the smoke collection cavity; the first noise reduction structure is arranged between the case and the fan device and comprises a first thin film close to the fan device and a second thin film close to the inner wall of the smoke collection cavity, and a closed first noise reduction cavity is formed between the first thin film and the second thin film. In the process of operating the range hood, noise sound waves generated by the operation of the fan device are incident into the first noise reduction cavity from the first film and then are emitted from the second film, under the resonance effect of the first film, the second film and the first noise reduction cavity, the sound absorption bandwidth is enlarged, the sound waves of different frequencies can be absorbed, the sound waves of different frequencies can be effectively absorbed and reduced, the oil smoke can be effectively prevented from entering the first sealed noise reduction cavity, the oil smoke working environment of the range hood is met, and the good noise reduction function is kept.
Description
Technical Field
The invention relates to the field of kitchen appliances, in particular to a noise-reducing range hood.
Background
The range hood has become the main kitchen household electrical appliances of modern family, along with people's pursuit to healthy life, in the use, except paying attention to the effect that the range hood inhales the oil smoke, people pay more and more attention to the influence of range hood noise. For example, the chinese patent application No. 201310627547.X discloses a silent smoke machine, which has a sound absorbing cover, which includes a micro-porous cavity and a sound absorbing cotton filled in the cavity, wherein the perforated plate absorbs a medium frequency sound by using a resistance noise reduction principle of resonance sound absorption, the sound absorbing cotton is a porous sound absorbing material of resistance noise reduction, mainly absorbs medium and high frequency sound waves, but the porous sound absorbing material is blocked to form closed pores after a period of time in an oil smoke environment, and loses a noise reduction function; for another example, as the chinese patent application with application number 201810205739.4, it discloses a noise-reducing range hood, which includes a noise-reducing orifice plate, a front cover plate and a gas floating plate, forming a resonant noise-reducing cavity, where the resonant cavity noise reduction is a form of the resistance noise-reducing principle, and the middle and low frequency noise-reducing performance is obvious, but the noise-reducing amount and the resonant frequency of the resonant cavity are related to the physical quantities such as the volume of the resonant cavity, and the internal space of the range hood is limited, so that the resonant cavity mode cannot effectively absorb and reduce the noise of the middle and.
Disclosure of Invention
The invention aims to provide a noise-reducing range hood, which aims to solve one or more technical problems in the prior art and at least provides a beneficial choice or creation condition.
The technical scheme adopted for solving the technical problems is as follows:
a noise reducing range hood, comprising: the device comprises a case, a fan device and a first noise reduction structure, wherein the case is provided with a smoke collection cavity; the fan device is arranged in the smoke collection cavity; the first noise reduction structure is arranged between the case and the fan device and comprises a first thin film close to the fan device and a second thin film close to the inner wall of the smoke collection cavity, and a closed first noise reduction cavity is formed between the first thin film and the second thin film.
The invention has the beneficial effects that: in the process of operating the range hood, noise sound waves generated by the operation of the fan device are incident into the first noise reduction cavity from the first film and then are emitted from the second film, under the resonance effect of the first film, the second film and the first noise reduction cavity, the sound absorption bandwidth is enlarged, the sound waves of different frequencies can be absorbed, the sound waves of different frequencies can be effectively absorbed and reduced, the oil smoke can be effectively prevented from entering the first sealed noise reduction cavity, the oil smoke working environment of the range hood is met, and the good noise reduction function is kept.
As a further improvement of the above technical solution, a second noise reduction cavity is formed between the second film and the inner wall of the smoke collection cavity.
The sound waves which are subjected to noise reduction through the first film, the second film and the first noise reduction cavity are ejected from the second film and enter the second noise reduction cavity, and then are further absorbed, so that the sound absorption frequency range can be further expanded.
As a further improvement of the above technical solution, a distance between the first film and the second film is D1, a value of D1 is 10-100 mm, a distance between the second film and the inner wall of the smoke collection cavity is D2, and a value of D2 is 10-100 mm.
The sound absorption bandwidth of the first noise reduction structure respectively comprises the distance between the first film and the second film and the distance between the second film and the inner wall of the smoke collection cavity, and the values of D1 and D2 are both 10-100 mm, so that the frequency of the sound absorption waves of the first noise reduction cavity and the second noise reduction cavity can be shifted to the middle-high frequency, wherein D is preferably 20 mm.
As a further improvement of the technical scheme, a plurality of fixing frames are uniformly distributed in the second noise reduction cavity, and the second film is connected with the inner wall of the smoke collection cavity through the fixing frames.
The firmness of the installation and fixation of the first noise reduction structure can be improved by the plurality of fixing frames.
As a further improvement of the above technical solution, the fan device includes a volute disposed in the smoke collection cavity, and a fan assembly installed in the volute, the volute has a centrifugal air duct, the centrifugal air duct is provided with an air inlet and an air outlet, the first noise reduction structure is shaped as a plate, and the first noise reduction structure is disposed between the air inlet and the inner wall of the smoke collection cavity facing the air inlet.
When smoke is sucked into the centrifugal air duct from the smoke collection cavity, large noise can be generated at the air inlet of the volute, most of noise generated in the operation of the range hood comes from the air inlet of the volute, and at the moment, the first plate-shaped noise reduction structure can absorb noise sound waves generated at the air inlet of the volute, so that the noise reduction can be realized, the materials can be reduced, and the manufacturing cost can be reduced. In other schemes, the first noise reduction structure can also be arranged around the inner wall of the smoke collection cavity, and the noise reduction effect is better. The fan assembly mainly comprises a motor and a wind wheel, is conventional technology and is not described in detail.
As a further improvement of the above technical solution, the volute includes a front cover plate and a rear cover plate which are arranged opposite to each other in a front-rear direction, and a shroud plate connected between the front cover plate and the rear cover plate, the shroud plate, the front cover plate and the rear cover plate enclose the centrifugal air duct, the front cover plate and/or the rear cover plate is provided with the air inlet, the air outlet is arranged on the shroud plate, the number of the first noise reduction structures is two, the two first noise reduction structures are respectively arranged at the outer sides of the front cover plate and the rear cover plate, the volute further includes a second noise reduction structure, the second noise reduction structure is arranged along the outer peripheral side of the shroud plate in an arc shape, the second noise reduction structure includes a third film and a fourth film, the third film is tightly attached to the outer peripheral surface of the shroud plate, the fourth film is arranged at the outer peripheral side of the third film, and a side film is connected around the third film and, and the third film, the fourth film and the side film form a closed third noise reduction cavity.
In the operation process of the fan device, the main noise of the fan device is that the motor drives the impeller to rotate in the volute to drive air to flow, and the generated rotating noise and eddy noise are generated; and the cavity of making an uproar also can effectively avoid the oil smoke to get into in the confined third, and then the structure of making an uproar is fallen to the second can absorb the noise sound wave of bounding wall periphery direction, and just the noise sound wave of penetrating from apron and back shroud is fallen the structure absorption by the first noise of making an uproar.
As a further improvement of the technical scheme, the distance between the third film and the fourth film is D3, and the value of D3 is 10-100 mm. The distance between the third film and the fourth film is a part of the sound absorption bandwidth of the second noise reduction structure, and the value of D3 is 10-100 mm, so that the frequency of the sound absorption wave of the third noise reduction cavity can be shifted towards middle and high frequencies, wherein D3 is preferably 20 mm.
As a further improvement of the above technical solution, the first noise reduction cavity and the third noise reduction cavity are both provided with a latticed support frame, and the perforation rate of the support frame is 70% to 90%.
The two supporting frames can respectively strengthen the structural strength between the first film and the second film and between the third film and the fourth film, meanwhile, the grid-shaped structure can absorb more medium-high frequency sound waves and expand the sound absorption bandwidth, wherein the grid can be circular, rectangular, polygonal and the like, and the optimal perforation rate of the supporting frames is in the range of 70-90%.
As a further improvement of the above technical solution, a volute tongue is formed at the air outlet, and both ends of the second noise reduction structure extend to an outlet of the volute tongue. The second noise reduction structure can also absorb sound waves generated by the volute tongue, so that the noise reduction effect is further improved.
As a further improvement of the above technical solution, sound absorbing layers are filled in the first noise reduction cavity and the third noise reduction cavity. The sound absorption layer can be a porous sound absorption material flat plate or sound absorption cotton to absorb more high-frequency sound waves.
Meanwhile, the mass density of the first film, the second film, the third film, the fourth film and the side film is 20-100 g. The mass density is increased, the resonance frequency moves to low frequency, the mass density is decreased, and the resonance frequency moves to medium-high frequency within a certain range, wherein the mass density refers to the gram weight of the film per square meter, and in order to ensure that the frequency range of sound absorption of the film is maximum, the mass density of the film is preferably 50g according to the production process of the film. The first film, the second film, the third film, the fourth film and the side films are one of flame-retardant plastic films, flame-retardant artificial leather, flame-retardant varnished cloth or metal films. The application of the flame-retardant plastic film, the flame-retardant artificial leather or the flame-retardant varnished cloth can realize economic and effective noise reduction under the environment with water mist and oil stain under high temperature and humidity, so that the film mainly absorbs low and medium frequency sound waves. The metal film has certain structural rigidity, so that other supporting structures are not needed for reinforcement.
Drawings
The invention is further described with reference to the accompanying drawings and examples;
fig. 1 is a schematic view of an internal structure of an embodiment of the range hood provided by the present invention, wherein two arrows respectively represent a forward direction and a backward direction;
FIG. 2 is an exploded view of one embodiment of the fan assembly of the present invention, wherein the two arrows indicate the forward direction and the backward direction, respectively;
FIG. 3 is an exploded view of a first noise reducing structure provided by the present invention in accordance with one embodiment;
FIG. 4 is a partial cross-sectional view of one embodiment of a first noise reducing structure provided in accordance with the present invention;
FIG. 5 is a partial cross-sectional view of an embodiment of a second noise reducing structure provided in accordance with the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if words such as "a plurality" are described, the meaning is one or more, the meaning of a plurality is two or more, more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 4, the range hood with noise reduction of the present invention is made as follows:
the range hood of the embodiment comprises a case 100, a fan device and a first noise reduction structure 200, wherein the case 100 is provided with a smoke collection cavity 110, and the fan device is arranged in the smoke collection cavity 110; the first noise reducing structure 200 is disposed between the chassis 100 and the fan device, the first noise reducing structure 200 includes a first film 210 adjacent to the fan device and a second film 220 adjacent to the inner wall of the smoke collecting cavity 110, a closed first noise reducing cavity 230 is formed between the first 210 and second 220 membranes, in the operation process of the range hood, the noise sound wave generated by the operation of the fan device is incident into the first noise reduction cavity 230 from the first film 210 and then emitted from the second film 220, under the resonance action of the first film 210, the second film 220 and the first noise reduction cavity 230, the sound absorption bandwidth is expanded, can absorb sound waves with different frequencies, effectively absorb the sound waves with different frequencies and reduce noise, and the first noise reduction cavity 230 can effectively prevent oil smoke from entering, meet the oil smoke working environment of the range hood, and keep a good noise reduction function.
Further, a second noise reduction cavity 240 is formed between the second film 220 and the inner wall of the smoke collection cavity 110, and sound waves which are noise reduced by the first film 210, the second film 220 and the first noise reduction cavity 230 are emitted from the second film 220 and enter the second noise reduction cavity 240, and are further absorbed, so that the sound absorption frequency range can be further expanded. At this time, the distance between the first film 210 and the second film 220 is D1, the value of D1 is 10-100 mm, the distance between the second film 220 and the inner wall of the smoke collection cavity 110 is D2, the value of D2 is 10-100 mm, the sound absorption bandwidth of the first noise reduction structure 200 respectively includes the distance between the first film 210 and the second film 220, the distance between the second film 220 and the inner wall of the smoke collection cavity 110, and the values of D1 and D2 are both 10-100 mm, so that the frequencies of the sound absorption waves of the first noise reduction cavity 230 and the second noise reduction cavity 240 can be shifted to the middle-high frequency, wherein preferably D is 20 mm.
In order to improve the fixing firmness of the first noise reduction structure 200, a plurality of fixing frames 241 are uniformly distributed in the second noise reduction cavity 240, and the second film 220 is connected with the inner wall of the smoke collection cavity 110 through the fixing frames 241.
Specifically, as shown in fig. 2, the fan device in this embodiment includes a volute 300 disposed in the smoke collection chamber 110, and a fan assembly mounted in the volute 300, where the fan assembly mainly includes a motor and a wind wheel, and for a conventional technology, details are not described, the volute 300 has a centrifugal air duct 310, the centrifugal air duct 310 is provided with an air inlet 311 and an air outlet 312, when smoke is sucked into the centrifugal air duct 310 from the smoke collection chamber 110, a large noise is generated at the air inlet 311 of the volute 300, and most of the noise generated during the operation of the range hood comes from the air inlet 311 of the volute 300, so the first noise reduction structure 200 in this embodiment is shaped like a plate, the first noise reduction structure 200 is disposed between the air inlet 311 and an inner wall of the smoke collection chamber 110 facing the air inlet 311, and the first noise reduction structure 200 can absorb noise sound waves generated at the air inlet 311 of the volute 300, the noise is reduced, and simultaneously, the material and the manufacturing cost can be reduced.
Further, as shown in fig. 2 and 5, the volute 300 includes a front cover plate 320 and a rear cover plate which are disposed opposite to each other in a front-rear direction, a shroud 340 connected between the front cover plate 320 and the rear cover plate, the enclosure 340, the front cover plate 320 and the rear cover plate enclose the centrifugal air duct 310, the front cover plate 320 and the rear cover plate are both provided with the air inlet 311, the air outlet 312 is arranged on the enclosure 340, as shown in fig. 1, the number of the first noise reduction structures 200 is two, two first noise reduction structures 200 are respectively arranged at the outer sides of the front cover plate 320 and the rear cover plate, the volute 300 further comprises a second noise reduction structure 400, the second noise reduction structure 400 is arranged along the arc shape of the outer periphery of the enclosing plate 340, the second noise reduction structure 400 can absorb the noise sound wave in the peripheral direction of the enclosing plate 340, and the noise sound waves emitted from the front cover plate 320 and the rear cover plate are absorbed by the two first noise reduction structures 200.
In the operation process of the fan device, the main noise of the fan device is the rotation noise and the vortex noise generated by the motor driving the impeller to rotate in the volute 300 to drive the air to flow. Specifically, the second noise reduction structure 400 in this embodiment includes a third film 410 and a fourth film 420, the third film 410 is tightly attached to the outer peripheral surface of the enclosing plate 340, the fourth film 420 is disposed on the outer peripheral side of the third film 410, a side film 430 is connected to the periphery between the third film 410 and the fourth film 420, the third film 410, the fourth film 420 and the side film 430 form a closed third noise reduction cavity 440, and the closed third noise reduction cavity 440 can also effectively prevent oil smoke from entering. The fan device produces rotatory sound wave and vortex sound wave incides the third from the third film 410 that is close to bounding wall 340 and falls the cavity 440 of making an uproar in the third, the sound wave of being reflected by the outside is incited the third and is fallen the cavity 440 of making an uproar through fourth film 420 and side film 430, under the resonance effect of third film 410 and fourth film 420 and the cavity 440 of making an uproar in the third, also make the sound absorption bandwidth enlarge, can absorb the sound wave of different frequencies, also make whole second fall the structure 400 of making an uproar simultaneously and can both absorb the sound energy in all directions, improve the sound absorption efficiency, the effect of making an uproar falls in the realization.
In addition, a volute tongue 313 is formed at the air outlet 312, and both ends of the second noise reduction structure 400 extend to an outlet of the volute tongue 313. The second noise reduction structure 400 can also absorb the sound wave generated by the volute tongue 313, so that the noise reduction effect is further improved.
Further, the distance between the third film 410 and the fourth film 420 is D3, and the value of D3 is 10-100 mm. The distance between the third film 410 and the fourth film 420 is a part of the sound absorption bandwidth of the second noise reduction structure 400, and the value of D3 is between 10 mm and 100mm, so that the frequency of the sound absorption waves of the third noise reduction cavity 440 can be shifted to middle and high frequencies, wherein preferably D3 is 20 mm.
In some embodiments, the first noise reducing structure 200 may also be disposed around the inner wall of the smoke collection chamber 110, which is more effective.
In some embodiments, as shown in fig. 3, the first noise reduction cavity 230 and the third noise reduction cavity 440 are provided with a grid-shaped support frame 500, and the two support frames 500 can respectively reinforce the structural strength between the first film 210 and the second film 220 and between the third film 410 and the fourth film 420, and at the same time, the grid-shaped structure can absorb more medium-high frequency sound waves and expand the sound absorption bandwidth, wherein the grid can be circular, rectangular, polygonal, and the like, and the perforation rate of the support frame 500 is optimally in the range of 70% to 90%.
In some embodiments, as shown in FIGS. 4 and 5, the sound absorption layer 600 is filled in both the first and third noise reduction cavities 230, 440. The sound absorbing layer 600 may be a porous sound absorbing material or a sound absorbing cotton to absorb more high frequency sound waves.
In some embodiments, the mass density of the first film 210, the second film 220, the third film 410, the fourth film 420 and the side film 430 is 20-100 g. The mass density is increased, the resonance frequency moves to low frequency, the mass density is decreased, and the resonance frequency moves to medium-high frequency within a certain range, wherein the mass density refers to the gram weight of the film per square meter, and in order to ensure that the frequency range of sound absorption of the film is maximum, the mass density of the film is preferably 50g according to the production process of the film.
In some embodiments, the first film 210, the second film 220, the third film 410, the fourth film 420 and the side film 430 are made of one of a flame-retardant plastic film, a flame-retardant artificial leather and a flame-retardant varnished cloth, and the application of the flame-retardant plastic film, the flame-retardant artificial leather or the flame-retardant varnished cloth can realize economic and effective noise reduction under the environment with water mist and oil stain at high temperature and humidity, so that the film mainly absorbs low-medium frequency sound waves.
Alternatively, the first film 210, the second film 220, the third film 410, the fourth film 420 and the side films 430 are metal films, and the metal films themselves have certain structural rigidity, so that reinforcement can be performed without other support structures.
In some embodiments, the air inlet 311 may be provided with one centrifugal fan, which is a single air inlet. In this embodiment, the two air inlets 311 are double inlet centrifugal fans.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (10)
1. A range hood that makes an uproar falls, its characterized in that: it includes:
a cabinet (100) having a smoke collection chamber (110);
a fan device installed in the smoke collection chamber (110);
the first noise reduction structure (200) is arranged between the chassis (100) and the fan device, the first noise reduction structure (200) comprises a first film (210) close to the fan device and a second film (220) close to the inner wall of the smoke collection cavity (110), and a closed first noise reduction cavity (230) is formed between the first film (210) and the second film (220).
2. A noise reducing range hood as defined in claim 1, wherein:
a second noise reducing cavity (240) is formed between the second membrane (220) and the inner wall of the smoke collecting cavity (110).
3. A noise reducing range hood as defined in claim 2, further comprising:
the distance between the first film (210) and the second film (220) is D1, the value of D1 is 10-100 mm, the distance between the second film (220) and the inner wall of the smoke collection cavity (110) is D2, and the value of D2 is 10-100 mm.
4. A noise reducing range hood as defined in claim 2, further comprising:
a plurality of fixing frames (241) are uniformly distributed in the second noise reduction cavity (240), and the second film (220) is connected with the inner wall of the smoke collection cavity (110) through the fixing frames (241).
5. A noise reducing range hood as defined in claim 1, wherein:
the fan device comprises a volute (300) arranged in the smoke collection cavity (110) and a fan assembly arranged in the volute (300), wherein the volute (300) is provided with a centrifugal air duct (310), the centrifugal air duct (310) is provided with an air inlet (311) and an air outlet (312), the appearance of the first noise reduction structure (200) is plate-shaped, and the first noise reduction structure (200) is arranged between the inner walls of the air inlet (311) and the smoke collection cavity (110) and faces the air inlet (311).
6. A noise reducing range hood as defined in claim 5, wherein:
the volute (300) comprises a front cover plate (320) and a rear cover plate which are arranged in a front-back opposite mode, and a surrounding plate (340) connected between the front cover plate (320) and the rear cover plate, wherein the surrounding plate (340), the front cover plate (320) and the rear cover plate surround the centrifugal air duct (310), the front cover plate (320) and/or the rear cover plate are/is provided with the air inlet (311) and the air outlet (312) which are arranged on the surrounding plate (340), the number of the first noise reduction structures (200) is two, the two first noise reduction structures (200) are respectively arranged at the outer sides of the front cover plate (320) and the rear cover plate, the volute (300) is further provided with a second noise reduction structure (400), the second noise reduction structure (400) is arranged along the arc-shaped outer peripheral side of the surrounding plate (340), the second noise reduction structure (400) comprises a third film (410) and a fourth film (420), and the third film (410) is tightly attached to the outer peripheral surface of the, the fourth film (420) is arranged on the outer periphery side of the third film (410), a side film (430) is connected to the periphery between the third film (410) and the fourth film (420), and the third film (410), the fourth film (420) and the side film (430) form a closed third noise reduction cavity (440).
7. A noise reducing range hood as defined in claim 6, wherein:
the distance between the third film (410) and the fourth film (420) is D3, and the value of D3 is 10-100 mm.
8. A noise reducing range hood as defined in claim 6, wherein:
the first noise reduction cavity (230) and the third noise reduction cavity (440) are both provided with a latticed support frame (500), and the perforation rate of the support frame (500) is 70% -90%.
9. A noise reducing range hood as defined in claim 6, wherein:
a volute tongue (313) is formed at the air outlet (312), and two ends of the second noise reduction structure (400) extend to the outlet of the volute tongue (313).
10. A noise reducing range hood as defined in claim 6, wherein:
and sound absorption layers (600) are filled in the first noise reduction cavity (230) and the third noise reduction cavity (440).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010952991.9A CN111895474A (en) | 2020-09-11 | 2020-09-11 | Range hood with noise reduction function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010952991.9A CN111895474A (en) | 2020-09-11 | 2020-09-11 | Range hood with noise reduction function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113357191A (en) * | 2021-06-30 | 2021-09-07 | 南京风机厂有限公司 | Manufacturing process of centrifugal fan with noise reduction structure at air outlet |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113357191A (en) * | 2021-06-30 | 2021-09-07 | 南京风机厂有限公司 | Manufacturing process of centrifugal fan with noise reduction structure at air outlet |
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