CN108240652B - Variable-frequency noise-reduction air outlet cover of range hood - Google Patents
Variable-frequency noise-reduction air outlet cover of range hood Download PDFInfo
- Publication number
- CN108240652B CN108240652B CN201711050442.7A CN201711050442A CN108240652B CN 108240652 B CN108240652 B CN 108240652B CN 201711050442 A CN201711050442 A CN 201711050442A CN 108240652 B CN108240652 B CN 108240652B
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- 230000009467 reduction Effects 0.000 claims abstract description 161
- 230000007246 mechanism Effects 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 238000010411 cooking Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model provides a fan housing of making an uproar falls in frequency conversion of range hood, including the base and locate the cover body on the base, the cover body includes inner cover and dustcoat, it has the hole of making an uproar to open on the perisporium of inner cover, the hole of making an uproar falls is arranged in a row along the axial of inner cover, be equipped with on the dustcoat inner wall with the hole matched with of making an uproar falls the chamber of making an uproar, be formed with at least a set of chamber group of making an uproar falls in the dustcoat axial, the volume size in each chamber group of making an uproar falls in the chamber group of making an uproar is along same direction unidirectional variation, install the actuating mechanism who is used for driving inner cover and dustcoat and produces relative motion in the axial on the base, and can make same hole of making an uproar with the chamber of making an uproar of the same makes an uproar in the chamber group of making an uproar. The utility model has the advantages that: the axial relative positions of the inner cover and the outer cover are adjusted through the driving mechanism, so that the noise reduction holes correspond to noise reduction cavities with different volumes, and the resonance frequency of the noise reduction cavities is identical to or matched with the wind noise frequency generated by different gears of the range hood, thereby realizing effective noise reduction.
Description
Technical Field
The utility model relates to an air outlet cover of a range hood, in particular to a variable-frequency noise-reduction air outlet cover of the range hood.
Background
Chinese cooking can generate a large amount of oil smoke, and in order to keep the kitchen environment clean and the health of human bodies, the range hood has become one of the indispensable devices of modern family kitchens. The fume exhaust fan sucks gas in an air inlet of the fume exhaust fan in the operation process, and the gas is exhausted through an air outlet of the blower. The existing range hood is generally provided with an air outlet cover at the air outlet of the fan, and the air outlet cover has the functions of collecting air, guiding flow and connecting the range hood with an air outlet pipe. The air flow generated by the fan is finally converged into the air outlet cover, so that the air flow in the air outlet cover is too concentrated, and turbulence is generated by the movement of the air flow in the cover body to generate noise, thereby affecting the cooking experience and the health of people.
In order to reduce noise generated when air flows through the air outlet cover, the structure of the air outlet cover is improved. The air outlet cover comprises a cover body, wherein the cover body is provided with an air outlet and an air inlet connected with an air outlet port of a volute, the peripheral wall of the cover body is a smooth surface, and a volute tongue extends upwards from the air inlet. The volute tongue is designed on the peripheral wall of the cover body, so that the volute air outlet port connected with the air outlet cover is free from additionally designing the volute tongue, the structure is simplified, the active noise reduction function of the air outlet cover is realized by utilizing the volute tongue, and the air outlet cover is noise-reduced through the volute tongue, so that the noise reduction effect is general. As another example, in the disclosure of chinese patent No. 201620102678.5 (issued to the public No. CN 205536022U), an air outlet cover for a range hood includes a cover bottom and a cover head, the cover bottom is an air inlet end, the cover head is an air outlet end, and a plurality of through holes are formed in a peripheral wall of the cover head so that the cover head is in a mesh structure locally or wholly. Although the air outlet cover achieves the noise reduction effect by injecting and mixing surrounding air when the fan discharges air, the noise reduction effect achieved by injecting and mixing is poor. In addition, the gear change of the range hood can change the wind noise frequency, the existing noise reduction measures cannot be correspondingly adjusted according to the gear change of the fan, the noise reduction effect is not intelligent enough, and the user experience is poor. In view of the above, there is a need for further improvement of the existing air outlet cover structure.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a variable-frequency noise-reduction air outlet cover of a range hood, which can adjust the resonance frequency of a noise-reduction cavity according to the gear of a fan.
The technical scheme adopted for solving the technical problems is as follows: the variable-frequency noise-reduction air outlet cover of the range hood comprises a base and a cover body arranged on the base, and is characterized in that: the cover body comprises an inner cover and an outer cover, noise reduction holes are formed in the peripheral wall of the inner cover and are arranged in a row along the axial direction of the inner cover, noise reduction cavities matched with the noise reduction holes are formed in the inner wall of the outer cover, at least one noise reduction cavity group is formed in the axial direction of the outer cover, the volume size of each noise reduction cavity in each noise reduction cavity group is unidirectionally changed along the same direction, a driving mechanism for driving the inner cover and the outer cover to generate relative motion in the axial direction is arranged on the base, and the same noise reduction holes can be matched with noise reduction cavities with different volumes in the corresponding noise reduction cavity groups under the driving of the driving mechanism.
Preferably, the noise reduction holes belonging to the same column are uniformly distributed at axial intervals of the inner cover, and the noise reduction holes of each column are uniformly distributed at circumferential intervals of the inner cover. Thus, the noise reduction holes are uniformly distributed on the inner cover, and better noise reduction effect is obtained.
As a preferable scheme, at least two adjacent noise reduction cavity groups are axially distributed on the inner wall of the outer cover, and the noise reduction cavity groups are in one-to-one correspondence with the noise reduction holes.
Further preferably, each noise reduction cavity group includes a first noise reduction cavity and a second noise reduction cavity, and the volume of the first noise reduction cavity is greater than the volume of the second noise reduction cavity. The noise reduction cavity group adopts two noise reduction cavities with different volumes, can be suitable for the range hoods with two different gears, and if the range hoods with more than two gears are provided, one noise reduction cavity group can correspondingly set the noise reduction cavities with the number.
As another preferable scheme, a group of noise reduction cavity groups are arranged along the axial direction of the inner wall of the outer cover, each group of noise reduction cavity groups are adjacently arranged along the circumferential direction of the outer cover, the volumes of the noise reduction cavities in the noise reduction cavity groups are sequentially and unidirectionally changed along the axial direction, and the number of the noise reduction cavities in each group of noise reduction cavity groups is larger than the number of the noise reduction holes in each row of noise reduction holes. The resonant frequency and bandwidth of the scheme are relatively large, and the noise reduction effect is better.
As a further preferable scheme, each noise reduction cavity of the noise reduction cavity group is a circular ring cavity horizontally distributed along the inner wall of the outer cover, and noise reduction holes positioned on the same horizontal circular ring surface are in one-to-one correspondence with the circular ring cavities. Therefore, the parallel resonant cavity is formed on the inner wall of the outer cover, so that the noise reduction holes on the same horizontal annular surface can be positioned in the same resonant cavity.
Further preferably, the air outlet cover is fixed at the top of the inner cover.
The driving mechanism can have various structures, preferably, the inner cover is fixed on the base, the driving mechanism comprises a motor, a screw rod and a screw sleeve, the motor is installed on the base and located on the outer side of the outer cover, the screw rod rotates under the driving of the motor, and the screw sleeve is fixed on the outer wall of the outer cover and is used for being matched with the screw rod.
In order to enable the driving motor to smoothly drive the screw rod to rotate, the driving mechanism further comprises a driving wheel and a driven wheel which are meshed with each other, the driving wheel is arranged on an output shaft of the motor, and the screw rod is arranged on the driven wheel.
In order to enable the outer cover to move more stably, a guide rod is arranged on the base, the guide rod is arranged opposite to the screw rod, and a guide sleeve which is in guide fit with the guide rod is arranged on the outer wall of the outer cover.
Compared with the prior art, the utility model has the advantages that: the variable-frequency noise-reducing air outlet cover of the range hood is provided with noise-reducing holes which are arranged in a row along the axial direction on the inner cover, the inner wall of the outer cover is provided with a noise-reducing cavity with the volume which is unidirectionally changed along the axial direction, when the range hood works, the noise-reducing cavity with the different volumes can be corresponding to the noise-reducing holes by adjusting the axial relative positions of the inner cover and the outer cover through the driving mechanism, and according to the Helmholtz resonance principle, the resonance frequency of the noise-reducing cavity is identical to or matched with the wind noise frequency generated by different gears of the range hood, so that effective noise reduction is realized.
Drawings
FIG. 1 is a schematic view of a first embodiment of the present utility model
FIG. 2 is a schematic view of another embodiment of the present utility model;
FIG. 3 is an exploded perspective view of a first embodiment of the present utility model;
FIG. 4 is a schematic view of the inner wall of the housing according to the first embodiment of the present utility model;
fig. 5 is a sectional view illustrating a structure of a range hood according to an embodiment of the present utility model when the range hood is operated in a low gear position;
fig. 6 is a sectional view illustrating a structure of a range hood according to an embodiment of the present utility model in a high range operation;
fig. 7 is a sectional view illustrating a structure of a second embodiment of the present utility model when the range hood is operated in a low gear position;
fig. 8 is a sectional view illustrating a structure of a range hood according to a second embodiment of the present utility model when the range hood is operated at a middle gear
Fig. 9 is a sectional view of a structure of a second embodiment of the present utility model when the range hood is operated in a high gear position;
fig. 10 is a schematic structural diagram of an inner wall of a housing according to a third embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
Embodiment one:
as shown in fig. 1 to 6, the variable frequency noise reduction air outlet cover of the range hood in the present embodiment includes a base 1, an inner cover 2, an outer cover 3, a driving mechanism 4 and an air outlet ring 5, wherein the inner cover 2 is fixed on the base 1, the driving mechanism 4 is installed on the base 1, the driving mechanism 4 is used for driving the outer cover 3 to axially move relative to the inner cover 2, and the air outlet ring 5 is fixed on the top of the inner cover 2.
The inner cover 2 has a cylindrical structure, noise reduction holes 21 are distributed on the peripheral wall of the inner cover 2, specifically, the noise reduction holes 21 are arranged in a row along the axial direction of the inner cover 2, the noise reduction holes 21 belonging to the same row are uniformly distributed at axial intervals of the inner cover 2, and the noise reduction holes 21 of each row are uniformly distributed at circumferential intervals of the inner cover 2.
The outer cover 3 has a cylindrical structure, and a noise reduction cavity 311 matched with the noise reduction hole 21 is arranged on the inner wall of the outer cover 3. In this embodiment, two noise reduction cavities 311 axially adjacent along the inner wall of the housing 3 form a noise reduction cavity group 31, and the noise reduction cavity groups 31 are in one-to-one correspondence with the noise reduction holes 21.
As shown in fig. 4 to 6, each noise reduction cavity group 31 has the same structure, and two noise reduction cavities 311 belonging to each noise reduction cavity group 31 are respectively expressed as a first noise reduction cavity a and a second noise reduction cavity b, wherein the first noise reduction cavity a is located above the second noise reduction cavity b, and the volume of the first noise reduction cavity a is larger than that of the second noise reduction cavity b. The noise reduction cavity groups 31 are also adjacently arranged in the circumferential direction of the outer cover 3, and the first noise reduction cavities a in the circumferentially adjacent noise reduction cavity groups 31 are positioned on the same horizontal ring, and the second noise reduction cavities b in the circumferentially adjacent noise reduction cavity groups 31 are positioned on the same horizontal ring.
The driving mechanism 4 in the present embodiment includes a motor 41, a screw 42, a nut 43, a driving wheel 44, and a driven wheel 55. Wherein, the motor 41 is installed on the base 1 and is located outside the housing 3, the screw rod 42 rotates under the drive of the motor 41, the threaded sleeve 43 is fixed on the outer wall of the housing 3 and is used for being matched with the screw rod 42, the driving wheel 44 and the driven wheel 45 are meshed with each other, the driving wheel 44 is installed on the output shaft of the motor 41, the upper end of the screw rod 42 is limited on the air outlet ring 5, and the lower end of the screw rod 42 is installed on the driven wheel 45. In addition, in order to guide the movement of the housing 3, a guide rod 46 opposite to the screw rod 42 is further provided on the outer side of the housing 3, the upper end of the guide rod 46 is limited on the air outlet ring 5, the lower end of the guide rod 46 is mounted on the base 1, and a guide sleeve 47 forming guide fit with the guide rod 46 is provided on the outer wall of the housing 3. The air outlet ring 5 is fixed with the upper end of the side wall of the inner cover 2 through a screw 6, and plays roles of fixing the screw sleeve 43, the guide rod 46, the limiting outer cover 3 and connecting an air outlet pipe (not shown in the figure).
According to the Helmholtz resonance principle, each independent noise reduction cavity 311 has a resonance frequency ofc is sound velocity, S is the area of the corresponding noise reduction hole 21, V is the volume of the noise reduction cavity, and L is the effective neck length of the noise reduction hole 21. It can be seen that the volume of the noise reduction cavity 311 is increased and the resonance frequency f is decreased while the other parameters are unchanged, whereas the volume of the noise reduction cavity 311 is decreased and the resonance frequency f is increased. By utilizing the Helmholtz resonance silencing principle, an elastic resonance system is formed by the air column in the noise reduction hole 21 and the air in the noise reduction cavity 311, when the partial noise frequency of the range hood is the same as the natural frequency of the resonance system, the air column in the noise reduction hole 21 resonates and rubs with the hole wall severely, and the acoustic energy is converted into heat energy by friction, so that the purpose of silencing is achieved.
When the range hood is in a low gear, at the moment, the air quantity is minimum, the air speed is slowest, the wind noise frequency is also minimum, the outer cover 3 moves to the position shown in fig. 5, each noise reduction hole 21 corresponds to the first noise reduction cavity a of the outer cover 3, and according to the Helmholtz resonance principle, the larger the volume is, the smaller the resonance frequency is, and the resonance frequency corresponding to the maximum volume is the same as or matched with the wind noise frequency of the low gear; when the range hood works in a high gear, the air quantity is maximum, the air speed is the fastest, the wind noise frequency is the maximum, at the moment, the outer cover 3 moves to the position shown in fig. 6, each noise reduction hole 21 corresponds to the second noise reduction cavity b of the outer cover 3, according to the Helmholtz resonance principle, the smaller the volume is, the larger the resonance frequency is, and the resonance frequency corresponding to the minimum volume is identical or matched with the wind noise frequency in the high gear.
In addition, because the sensitivity degree of each person to noise is different, when the range hood is in the same gear, the noise with different frequency widths can be reduced through frequency conversion.
Embodiment two:
as shown in fig. 7 to 9, the air outlet cover of the embodiment is only provided with a group of noise reduction cavity groups 31 along the axial direction of the inner wall of the outer cover 3, and the volume of the noise reduction cavities 311 in each group of noise reduction cavity groups 31 sequentially changes unidirectionally along the axial direction, i.e. the volume of the noise reduction cavities 31 gradually decreases from top to bottom, and the number of the noise reduction cavities 311 in each group of noise reduction cavity groups 31 is greater than the number of the noise reduction holes 21 in each row of noise reduction holes. And, each noise reduction chamber group 31 is disposed adjacently in the circumferential direction of the housing 3.
As shown in fig. 7, the housing 3 is moved to the lowest position, and the volume of the noise reduction cavity 311 corresponding to each noise reduction hole 21 is relatively minimum, and at this time, the range hood is in the low gear;
as shown in fig. 8, the outer cover 3 moves to the middle position, the volume of the noise reduction cavity 311 corresponding to each noise reduction hole 21 is centered, and at this time, the range hood is in the middle gear;
as shown in fig. 9, the housing 3 is moved to the highest position, and the volume of the noise reduction cavity 311 corresponding to each noise reduction hole 21 is the largest, and at this time, the range hood is in the high gear.
The noise reduction of the air outlet cover of the embodiment also adopts the helmholtz resonance principle, and the specific noise reduction principle is the same as that of the first embodiment and will not be described here.
Embodiment III:
as shown in fig. 10, each noise reduction cavity 311 of the noise reduction cavity group 31 of the air outlet cover in the present embodiment is a circular ring cavity horizontally distributed along the inner wall of the air outlet cover, and the noise reduction holes 21 located on the same horizontal circular ring surface are in one-to-one correspondence with the circular ring cavities. In operation, the driving mechanism 4 drives the outer cover 3 to axially move relative to the inner cover 2 so that the noise reduction holes 21 correspond to the noise reduction cavities 311 with different volumes, and the noise reduction also adopts the helmholtz resonance principle, and the specific noise reduction principle is the same as that of the first embodiment, and will not be described herein.
The foregoing is merely illustrative of the preferred embodiments of this utility model, and it will be appreciated by those skilled in the art that variations and modifications of this utility model can be made without departing from the principles of the utility model, and these are considered to be within the scope of the utility model.
Claims (7)
1. The utility model provides a range hood's frequency conversion air-out cover of making an uproar that falls, includes base (1) and locates the cover body on base (1), its characterized in that: the cover body comprises an inner cover (2) and an outer cover (3), noise reduction holes (21) are formed in the peripheral wall of the inner cover (2), the noise reduction holes (21) are arranged in a row along the axial direction of the inner cover (2), noise reduction cavities (311) matched with the noise reduction holes (21) are formed in the inner wall of the outer cover (3), at least one group of noise reduction cavity groups (31) are formed in the axial direction of the outer cover (3), the volume size of each noise reduction cavity (311) in each group of noise reduction cavity groups (31) is unidirectionally changed along the same direction, a driving mechanism (4) for driving the inner cover (2) and the outer cover (3) to generate relative motion in the axial direction is arranged on the base (1), the noise reduction cavities (311) with different volume sizes in the same noise reduction cavity groups (31) can be matched under the driving of the driving mechanism (4), the noise reduction holes (21) belonging to the same row are uniformly distributed at intervals in the axial direction of the inner cover (2), the noise reduction cavities (21) in the same row are uniformly distributed at intervals in the inner cover (2), the first group (31) of adjacent noise reduction cavities (31) are distributed at intervals, the first group (31) of adjacent to the second group (31) of noise reduction cavities (31) are distributed at intervals, the first group (31) of noise reduction cavity (31) is distributed at intervals, the first group (31) is distributed at the same time, and the volume of the first noise reduction cavity (a) is larger than that of the second noise reduction cavity (b).
2. The utility model provides a range hood's frequency conversion air-out cover of making an uproar that falls, includes base (1) and locates the cover body on base (1), its characterized in that: the cover body comprises an inner cover (2) and an outer cover (3), noise reduction holes (21) are formed in the peripheral wall of the inner cover (2), the noise reduction holes (21) are arranged in a row along the axial direction of the inner cover (2), noise reduction cavities (311) matched with the noise reduction holes (21) are formed in the inner wall of the outer cover (3), at least one group of noise reduction cavity groups (31) are formed in the axial direction of the outer cover (3), the volume size of each noise reduction cavity (311) in each group of noise reduction cavity groups (31) is unidirectionally changed along the same direction, a driving mechanism (4) for driving the inner cover (2) and the outer cover (3) to generate relative motion in the axial direction is arranged on the base (1), the noise reduction cavities (311) with different volume sizes in the same noise reduction cavity groups (31) can be matched under the driving of the driving mechanism (4), the noise reduction holes (21) belonging to the same row are uniformly distributed at intervals in the axial direction of the inner cover (2), the noise reduction cavities (311) of each row of noise reduction cavity groups (31) are uniformly distributed along the axial direction of the inner cover (31), the adjacent noise reduction cavity groups (31) are sequentially arranged in the circumferential direction along the axial direction of the groups of the adjacent cavity groups (31, the number of the noise reduction cavities (311) in each noise reduction cavity group (31) is larger than the number of the noise reduction holes (21) in each row of noise reduction holes.
3. The utility model provides a range hood's frequency conversion air-out cover of making an uproar that falls, includes base (1) and locates the cover body on base (1), its characterized in that: the cover body comprises an inner cover (2) and an outer cover (3), noise reduction holes (21) are formed in the peripheral wall of the inner cover (2), the noise reduction holes (21) are arranged in a row along the axial direction of the inner cover (2), noise reduction cavities (311) matched with the noise reduction holes (21) are formed in the inner wall of the outer cover (3), at least one group of noise reduction cavity groups (31) are formed in the axial direction of the outer cover (3), the volume sizes of the noise reduction cavities (311) in each group of noise reduction cavity groups (31) are unidirectionally changed along the same direction, a driving mechanism (4) used for driving the inner cover (2) and the outer cover (3) to generate relative motion in the axial direction is arranged on the base (1), the noise reduction cavities (311) with different volume sizes in the same noise reduction cavity group (31) can be matched under the driving of the driving mechanism (4), the noise reduction holes (21) belonging to the same row are uniformly distributed in the axial direction of the inner cover (2), the noise reduction cavities (21) of each row of noise reduction cavity group (21) are uniformly distributed along the circumferential direction of the same ring (31), and the noise reduction ring (31) is distributed along the same ring (3) and the ring (31) is horizontally distributed on the ring (3).
4. The variable frequency noise reduction air outlet cover of the range hood according to claim 1, wherein: the air-out mask (5) is further included, and the air-out mask (5) is fixed at the top of the inner mask (2).
5. The variable frequency noise reduction exhaust hood of a range hood according to any one of claims 1 to 4, wherein: the inner cover (2) is fixed on the base (1), the driving mechanism (4) comprises a motor (41), a screw rod (42) and a screw sleeve (43), the motor (41) is installed on the base (1) and located on the outer side of the outer cover (3), the screw rod (42) rotates under the driving of the motor (41), and the screw sleeve (43) is fixed on the outer wall of the outer cover (3) and is used for being matched with the screw rod (42).
6. The variable frequency noise reduction air outlet cover of the range hood according to claim 5, wherein: the driving mechanism (4) further comprises a driving wheel (44) and a driven wheel (45) which are meshed with each other, the driving wheel (44) is arranged on an output shaft of the motor (41), and the screw rod (42) is arranged on the driven wheel (45).
7. The variable frequency noise reduction air outlet cover of the range hood according to claim 5, wherein: a guide rod (46) is arranged on the base (1), the guide rod (46) is arranged opposite to the screw rod (42), and a guide sleeve (47) which is in guide fit with the guide rod (46) is arranged on the outer wall of the outer cover (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711050442.7A CN108240652B (en) | 2017-10-31 | 2017-10-31 | Variable-frequency noise-reduction air outlet cover of range hood |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711050442.7A CN108240652B (en) | 2017-10-31 | 2017-10-31 | Variable-frequency noise-reduction air outlet cover of range hood |
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| CN108240652A CN108240652A (en) | 2018-07-03 |
| CN108240652B true CN108240652B (en) | 2024-01-16 |
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| CN106050751A (en) * | 2016-07-22 | 2016-10-26 | 宁波方太厨具有限公司 | Silencer of range hood |
| CN106439961A (en) * | 2016-08-31 | 2017-02-22 | 杭州老板电器股份有限公司 | Side suction type extractor hood noise reduction device |
| CN106402974A (en) * | 2016-11-11 | 2017-02-15 | 宁波方太厨具有限公司 | Noise-reducing range hood |
| CN106568109A (en) * | 2016-11-11 | 2017-04-19 | 宁波方太厨具有限公司 | Noise reducing impeller and range hood applying impeller |
| CN206592345U (en) * | 2017-03-15 | 2017-10-27 | 宁波方太厨具有限公司 | A kind of auxiliary denoising device of cooking-fume exhauster blower system |
| CN206592349U (en) * | 2017-03-15 | 2017-10-27 | 宁波方太厨具有限公司 | A kind of blower fan system auxiliary denoising device of single air-inlet range hood |
| CN106989069A (en) * | 2017-05-25 | 2017-07-28 | 江苏永益环保科技有限公司 | Blower fan silencer |
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