CN108731070A - A kind of kitchen ventilator with multilayer noise filtering device - Google Patents
A kind of kitchen ventilator with multilayer noise filtering device Download PDFInfo
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- CN108731070A CN108731070A CN201810772831.9A CN201810772831A CN108731070A CN 108731070 A CN108731070 A CN 108731070A CN 201810772831 A CN201810772831 A CN 201810772831A CN 108731070 A CN108731070 A CN 108731070A
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- filtering device
- noise filtering
- panel
- noise
- hole
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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
- F24C15/2035—Arrangement or mounting of filters
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ventilation (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
A kind of kitchen ventilator with multilayer noise filtering device is provided with smoke machine main body and can reduce the noise filtering device of multi-frequency noise, and noise filtering device is assemblied in smoke machine main body；The noise filtering device is set as that multiple panels for offsetting different frequency noise through-hole are distributed with；The panel is provided with multilayer, and Multilayer panel is assemblied in smoke machine main body.A kind of kitchen ventilator with multilayer noise filtering device of the present invention can reach multi-frequency noise noise reduction by adjusting the aperture of different through-holes, edge and the edge minimum range of adjacent through-holes, the through-hole distribution of panel or the noise filtering device of through-hole with the combination at a distance from smoke machine main body.The noise filtering device can keep long-term good noise reduction, the noise filtering device to have the advantages that be easy to arrange, and dust, the grease on surface etc. can be by removing cleaning.The noise filtering device has the advantages that low cost, reliability are high.
Description
Technical field
The present invention relates to kitchen ventilator field, more particularly to a kind of kitchen ventilator with multilayer noise filtering device.
Background technology
It is chronically in the environment of high noisy, the hearing of people is often damaged, and can also be made in the environment of having noise for a long time
At user emotion problem.As people's quality of the life improves, people are also lower and lower to the tolerance of noise.Therefore kitchen ventilator
Noise reduction is also increasingly paid attention to.
Kitchen ventilator noise reduction in the prior art is mostly the reduction that noise is realized by active noise reduction and passive noise reduction mode.
Active noise reduction mode can only act on noise of the frequency within 1000Hz, can only be by passive for the noise more than 1000Hz
Noise reduction technology processing.And the noise that the passive denoising device of the prior art can only be directed to single-frequency section is handled, it cannot be right
The noise of multiband carries out noise reduction.Since the noisy frequency range that kitchen ventilator generates can be 100Hz~8000Hz, it is clear that existing
Kitchen ventilator can not be directed to for the passive denoising device of single-frequency section generate good noise reduction in technology.
Therefore in view of the shortcomings of the prior art, a kind of kitchen ventilator with multilayer noise filtering device of offer is to solve the prior art
It is insufficient very necessary.
Invention content
It provides it is an object of the invention to avoid in place of the deficiencies in the prior art a kind of with multilayer noise filtering device
Kitchen ventilator.The kitchen ventilator with multilayer noise filtering device has the advantages that multi-frequency noise can be reduced.
The above-mentioned purpose of the present invention is realized by following technical measures：
A kind of kitchen ventilator with multilayer noise filtering device is provided, smoke machine main body is provided with and multi-frequency noise can be reduced
Noise filtering device, noise filtering device are assemblied in smoke machine main body.
The noise filtering device is set as that multiple panels for offsetting different frequency noise through-hole are distributed with.
The panel is provided with multilayer, and Multilayer panel is assemblied in smoke machine main body.
Preferably, the through-hole of above-mentioned through-hole and adjacent panels per deck panels is mutually aligned in whole or in part.
Preferably, the through-hole of above-mentioned through-hole and adjacent panels per deck panels is in mutually stagger setting in whole or in part.
Preferably, the aperture of above-mentioned through-hole is defined as d, and d≤30mm.
Preferably, the value of above-mentioned d is multiple.
Preferably, the edge minimum range of the edge of above-mentioned through-hole and adjacent through-holes is b, and b is the arbitrary value more than 0.
Preferably, the value of above-mentioned b is multiple.
The present invention is by adjusting the edge minimum range in the aperture of different through-holes, the edge of through-hole and adjacent through-holes, panel
Through-hole distribution or combination of the noise filtering device at a distance from smoke machine main body reach multi-frequency noise noise reduction.
Preferably, the thickness of above-mentioned panel is less than 20mm.
Preferably, the shape of above-mentioned through-hole is circle, ellipse, triangle, square, rectangle, pentagon, six sides
At least one of shape, diamond shape or irregular shape.
Preferably, there are gaps between above-mentioned panel and the immediate wall surface of smoke machine main body, are by the distance definition in gap
H1。
Preferably, above-mentioned sound filter device is additionally provided with sound-absorbing part, and sound-absorbing part assembles smoke machine main body.
Preferably, the thickness of above-mentioned sound-absorbing part is defined as H2, and H2≤0.6H1。
Preferably, above-mentioned sound-absorbing part is fixed on panel close to the outer surface of smoke machine main body；Or
The sound-absorbing part is fixed on the surface of panel and the nearest wall surface of smoke machine main body；Or
The sound-absorbing part is fixed between panel and the nearest wall surface gap of smoke machine main body.
Preferably, above-mentioned sound-absorbing part is set as multiple, and sound-absorbing part is corresponded with panel.
Preferably, above-mentioned sound-absorbing part is fiber, PP cottons, polyester fiber, Carbon fibe or porous foam；Or
The sound-absorbing part is porous plate.
Preferably, above-mentioned panel is metal decking, plastic front board or alloy panel.
Preferably, above-mentioned panel is fixedly connected with reinforced structure.
Preferably, above-mentioned reinforced structure is convex closure, recessed packet or reinforcing rib.
Preferably, it is 100Hz~8000Hz that above-mentioned noise filtering device, which eliminates noisy frequency range,.
A kind of kitchen ventilator with multilayer noise filtering device of the present invention is provided with smoke machine main body and can reduce multi-frequency and makes an uproar
The noise filtering device of sound, noise filtering device are assemblied in smoke machine main body.The noise filtering device is set as being distributed with multiple
Panel for offsetting different frequency noise through-hole.The panel is provided with multilayer, and Multilayer panel is assemblied in smoke machine main body.It is existing
Denoising device in technology can only be directed to single target frequency noise reduction.The present invention's is a kind of with multilayer noise filtering device
Kitchen ventilator can by adjusting the edge minimum range in the aperture of different through-holes, the edge of through-hole and adjacent through-holes, panel it is logical
The combination of pore size distribution or noise filtering device at a distance from smoke machine main body reaches multi-frequency noise noise reduction.The noise filtering device
Long-term good noise reduction, the noise filtering device can be kept to have the advantages that be easy to arrange, dust, the grease on surface etc. can be with
By removing cleaning.The noise filtering device has the advantages that low cost, reliability are high.The material of the noise filtering device is anti-
Burn into chemical resistance and the advantages of being hardly damaged, while enough effectively reducing narrow frequency noise and broadband noise.
Description of the drawings
Using attached drawing, the present invention is further illustrated, but the content in attached drawing does not constitute any limit to the present invention
System.
Fig. 1 is a kind of range hood structure schematic diagram with multilayer noise filtering device of embodiment 1.
Fig. 2 is the panel schematic partial cross-sectional view in Fig. 1.
Fig. 3 is panel construction schematic diagram in Fig. 1.
Fig. 4 is a kind of range hood structure schematic diagram with multilayer noise filtering device of embodiment 2.
Fig. 5 is a kind of range hood structure schematic diagram with multilayer noise filtering device of embodiment 3.
Fig. 6 is the panel schematic partial cross-sectional view in Fig. 5.
Fig. 7 is a kind of range hood structure schematic diagram with multilayer noise filtering device of embodiment 4.
Fig. 8 is the panel construction schematic diagram of the embodiment of the present invention 6.
In Fig. 1 to Fig. 8, include：
Noise filtering device 1,
Panel 11, through-hole 111, reinforced structure 112,
Sound-absorbing part 12,
Smoke machine main body 2.
Specific implementation mode
Technical scheme of the present invention is described further with the following Examples.
Embodiment 1.
A kind of kitchen ventilator with multilayer noise filtering device is provided with smoke machine main body 2 and can reduce more as shown in Figs. 1-3
The noise filtering device 1 of frequency noise, noise filtering device 1 are assemblied in smoke machine main body 2.Noise filtering device 1 is set as being distributed
There are multiple panels 11 for offsetting different frequency noise through-hole 111.Panel 11 is provided with multilayer, and Multilayer panel 11 is assemblied in cigarette
Owner's body 2.The panel 11 of specific the present embodiment is set as two layers, and two-layer panel 11 is assemblied in smoke machine main body 2.
It should be noted that 11 number of plies of panel of the invention can be two layers, or be more than 2 arbitrary positive integer, tool
Body embodiment is depending on actual conditions.
The through-hole 111 of every deck panels 11 of the present embodiment and the through-hole 111 of adjacent panels 11 are all mutually aligned.Through excessive
Secondary experimental data proves that the effect that per the through-hole 111 of deck panels 11 and the through-hole 111 of adjacent panels 11 is all mutually aligned is preferable.
It should be noted that the through-hole 111 of every deck panels 11 of the invention and the through-hole 111 of adjacent panels 11 are all mutually right
Neat is preferred, or through-hole 111 and 111 part of through-hole of adjacent panels 11 per deck panels 11 are mutually aligned, and also may be used
The through-hole 111 of the through-hole 111 for thinking every deck panels 11 and adjacent panels 11 is in mutually stagger setting in whole or in part, specific real
Mode is applied depending on actual conditions.
The aperture of the through-hole 111 of the present invention is defined as d, and d≤30mm；Wherein the value of d is multiple.
The edge of the through-hole 111 of the present invention is b with the edge minimum range of adjacent through-holes 111, and b is the arbitrary value more than 0,
Wherein the value of b is multiple.
In aperture, d is constant, and the value of the edge of through-hole 111 and the edge minimum range b of adjacent through-holes 111 are smaller to disappear
The target noise frequency removed is bigger.It is constant at the edge of through-hole 111 and the edge minimum range b of adjacent through-holes 111,
The smaller target noise frequency to be eliminated of the value of aperture d is with regard to smaller.
The present invention be the edge of edge and the adjacent through-holes 111 by adjusting the apertures of different through-holes 111, through-hole 111 most
Small distance, the distribution of through-hole 111 of panel 11 or combination of the noise filtering device 1 at a distance from smoke machine main body 2 reach multi-frequency
The purpose of noise noise reduction.And it is less than 20mm per the thickness of deck panels 11.
The shape of the through-hole 111 of the present invention is circle, ellipse, triangle, square, rectangle, pentagon, six sides
At least one of shape, diamond shape or irregular shape.The through-hole 111 of specific the present embodiment is conveniently of circular shape, because
Circle makes upper relatively easy in technique, and because of the interference of not no corner angle, noise reduction is optimal.
It should be noted that the shape of through-hole 111 may be ellipse, triangle, square, rectangle, pentagon, six
Side shape, diamond shape or irregular shape, or the combination of above-mentioned various shapes, specific embodiment with actual conditions and
It is fixed.
The denoising device principle of the present invention：Noise filtering device 1 can be propagated in limited closed space in noise source
When to noise filtering device 1, noise reduction is carried out.Sound wave is usually propagated with negative direction touching noise filtering device 1, so big portion
The incidence wave divided can be interfered with back wave.
Noise filtering device 1 be using resonance principle carry out noise reduction, when the edge of aperture d and through-hole 111 with it is adjacent
After the edge minimum range b of through-hole 111 is determined, specific noise frequency and the noise filtering that fixed target frequency has been set in space
Device 1 forms covibration.When resonance occurs, the sound wave of oscillation can intensely pierce into out through-hole 111 back and forth in air,
The acoustic energy of noise is converted to friction loss in the process, reaches and eliminates target frequency noise.
The kitchen ventilator with multilayer noise filtering device is provided with smoke machine main body 2 and can reduce the noise of multi-frequency noise
Filter device 1, noise filtering device 1 are assemblied in smoke machine main body 2.The noise filtering device 1 is set as that multiple be used for is distributed with
Offset the panel 11 of different frequency noise through-hole 111.The panel 11 is provided with multilayer, and Multilayer panel 11 is assemblied in smoke machine main body
2.Denoising device in the prior art can only be directed to single target frequency noise reduction.A kind of band multilayer noise filtering of the present invention
The kitchen ventilator of device can be minimum by adjusting the aperture of different through-holes 11, the edge of through-hole 111 and the edge of adjacent through-holes 111
Distance, the distribution of through-hole 111 of panel 11 or combination of the noise filtering device 1 at a distance from smoke machine main body 2 reach multi-frequency and make an uproar
Sound noise reduction.The noise filtering device 1 can keep long-term good noise reduction, the noise filtering device 1 excellent with being easy to arrange
Point, dust, the grease on surface etc. can be by removing cleaning.The noise filtering device 1 has low cost, high excellent of reliability
Point.The advantages of material of the noise filtering device 1 is anticorrosive, chemical resistance and is hardly damaged, while can effectively reduce narrow
Frequency noise and broadband noise.
Embodiment 2.
A kind of kitchen ventilator with multilayer noise filtering device, as shown in figure 4, other features are same as Example 1, difference
It is in there are gaps between 2 immediate wall surface of panel 11 and smoke machine main body, are H by the distance definition in gap1.Noise mistake
Filter device 1 is additionally provided with sound-absorbing part 12, and sound-absorbing part assembles smoke machine main body 2.The thickness of sound-absorbing part 12 is defined as H2, and H2≤
0.6H1.The thickness of the panel 11 of the present invention is less than 20mm.
The sound-absorbing part 12 of the present embodiment is fixed on 11 panel 11 of panel close to the outer surface of smoke machine main body 2.It should be noted that
The sound-absorbing part 12 of the present invention can also be fixed on the surface of panel 11 and the nearest wall surface of smoke machine main body 2 or sound-absorbing part 12 is fixed
Between the nearest wall surface gap of panel 11 and smoke machine main body 2, depending on specific embodiment is with actual conditions.
The denoising device principle of the present invention is such：In limited closed space, noise filtering is traveled in noise source
When device 1, noise reduction is carried out.Sound wave is usually propagated with negative direction touching water conservancy diversion noise filtering device 1, thus it is most enter
Ejected wave can be interfered with back wave.In specific distance, about a quarter of noise source wavelength away from i.e. H at degree1, particle
Speed reaches highest.
The density and material of sound-absorbing part 12 also have important influence, sound wave can directly through the sound-absorbing part of extremely-low density,
The frictional wear of acoustic energy can not be increased；Under high density, noise sound wave then can be reflected away directly, can not enter noise mistake
Filter the hole of device 1.Therefore the sound-absorbing part 12 of the present invention is preferably fiber, PP cottons, polyester fiber, Carbon fibe or porous foam.
Or sound-absorbing part 12 is porous plate.
The present embodiment increases sound-absorbing part 12 compared with embodiment 1, and the setting of sound-absorbing part 12 can increase the consume of friction, reinforce drop
It makes an uproar effect.
Embodiment 3.
A kind of kitchen ventilator with multilayer noise filtering device, as seen in figs. 5-6, other features are same as Example 1, different
Place is, the through-hole 111 of every deck panels 11 of the present embodiment and the through-hole 111 of adjacent panels 11 are all set in mutually staggering
It sets.
Compared with Example 1, the surface area bigger of the noise filtering device 1 of the present embodiment, can ensure more broadly
Reduce noise.
Embodiment 4.
A kind of kitchen ventilator with multilayer noise filtering device, as shown in fig. 7, other features are same as Example 2, difference
It is in panel 11 is set as three layers, and sound-absorbing part 12 is set as three, and sound-absorbing part 12 is corresponded with panel 11.
The assembly method of panel 11 and sound-absorbing part 12 is the outer surface that first sound-absorbing part 12 is fixed on first layer panel 11,
Second sound-absorbing part 12 is fixed on the outer surface of the second deck panels 11, and third sound-absorbing part 12 is fixed on the outer of third deck panels 11
Surface, first layer panel 11, the second deck panels 11 are all parallel with third deck panels 11, and the through-hole 111 of three deck panels 11 is complete
Portion is aligned.
Compared with Example 2, panel 11 and sound-absorbing part 12 all increase is more advantageous to noise reduction to the present embodiment, and effect is more preferable.
Embodiment 5.
A kind of kitchen ventilator with multilayer noise filtering device, other features are same as Example 1, the difference is that, this
The panel 11 of embodiment be specially metal decking 11, it should be noted that the present invention panel 11 or plastic front board 11 or
Alloy panel 11, depending on specific embodiment is with actual conditions.
The panel 11 of the metal of the present embodiment has the advantages that high temperature resistant, durable.
Embodiment 6.
A kind of kitchen ventilator with multilayer noise filtering device, as shown in figure 8, other features are same as Example 1, difference
It is in the panel 11 of the present embodiment is fixedly connected with reinforced structure 112.Specific reinforced structure 112 is reinforcing rib.The present invention
Noise filtering device 1 eliminate noisy frequency range be 100Hz~8000Hz.
It should be noted that reinforced structure 112 of the invention or convex closure or recessed packet, or a variety of arbitrary groups
It closes, depending on specific embodiment is with actual conditions.
Compared with Example 1, the more rigid of panel 11 is low resistance structure to the present embodiment.Low resistance structure can make into
Ejected wave and back wave have out of phase under the specific distance with reflecting surface, can cancel out each other to the sound wave of noise, from
And reduce the intensity of noise.
Embodiment 7.
A kind of design of the kitchen ventilator with multilayer noise filtering device：
Target frequency 1：7000Hz.
The aperture d=10mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=2.6mm.
Target frequency 2：800Hz.
The aperture d=5mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=20mm.
Therefore the noise filtering device 1 of the kitchen ventilator is only in the spy with the corresponding through-hole of above-mentioned two target frequency 111
Property can effectively eliminate the noise of corresponding frequency.
It should be noted that the present embodiment only lists the design parameter of two target frequencies, table can not only for the present invention
For the noise of two kinds of frequencies, only corresponding different parameter, the noise of the invention that can eliminate multi-frequency reach wideband frequency drop
It makes an uproar purpose.
Embodiment 8.
A kind of design of the kitchen ventilator with multilayer noise filtering device：
Target frequency 1：8000Hz.
The aperture d=10mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=2.5mm.
Target frequency 2：100Hz.
The aperture d=2mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=50mm.
Therefore the noise filtering device 1 of the kitchen ventilator is only in the spy with the corresponding through-hole of above-mentioned two target frequency 111
Property can effectively eliminate the noise of corresponding frequency.
It should be noted that the present embodiment only lists the design parameter of two target frequencies, table can not only for the present invention
For the noise of two kinds of frequencies, only corresponding different parameter, the noise of the invention that can eliminate multi-frequency reach wideband frequency drop
It makes an uproar purpose.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than is protected to the present invention
The limitation of range, although being explained in detail to the present invention with reference to preferred embodiment, the member of the ordinary skill of this field should manage
Solution, can be modified or replaced equivalently technical solution of the present invention, without departing from the essence and model of technical solution of the present invention
It encloses.
Claims (10)
1. a kind of kitchen ventilator with multilayer noise filtering device, it is characterised in that：It is provided with smoke machine main body and multi-frequency can be reduced
The noise filtering device of noise, noise filtering device are assemblied in smoke machine main body；
The noise filtering device is set as that multiple panels for offsetting different frequency noise through-hole are distributed with；
The panel is provided with multilayer, and Multilayer panel is assemblied in smoke machine main body.
2. the kitchen ventilator according to claim 1 with multilayer noise filtering device, it is characterised in that：Every deck panels
The through-hole of through-hole and adjacent panels is mutually aligned in whole or in part.
3. a kind of kitchen ventilator with multilayer noise filtering device according to claim 1, it is characterised in that：Every level
The through-hole of plate and the through-hole of adjacent panels are in mutually stagger setting in whole or in part.
4. the kitchen ventilator according to claim 2 or 3 with multilayer noise filtering device, it is characterised in that：The through-hole
Aperture is defined as d, and d≤30mm；
The value of the d is multiple.
5. the kitchen ventilator according to claim 4 with multilayer noise filtering device, it is characterised in that：The edge of the through-hole
Edge minimum range with adjacent through-holes is b, and b is the arbitrary value more than 0；
The value of the b is multiple.
6. the kitchen ventilator according to claim 5 with multilayer noise filtering device, it is characterised in that：It is logical by adjusting difference
The edge minimum range in the aperture in hole, the edge of through-hole and adjacent through-holes, the through-hole distribution of panel or noise filtering device with
The combination of the distance of smoke machine main body reaches multi-frequency noise noise reduction；
The thickness of the panel is less than 20mm；
The shape of the through-hole is circle, ellipse, triangle, square, rectangle, pentagon, hexagon, diamond shape or not
At least one of regular shape.
7. the kitchen ventilator according to claim 6 with multilayer noise filtering device, it is characterised in that：The panel and smoke machine
There are gaps between the immediate wall surface of main body, are H by the distance definition in gap1。
8. the kitchen ventilator according to claim 7 with multilayer noise filtering device, it is characterised in that：The noise filtering dress
It sets and is additionally provided with sound-absorbing part, sound-absorbing part assembles smoke machine main body；
The thickness of the sound-absorbing part is defined as H2, and H2≤0.6H1。
9. the kitchen ventilator according to claim 8 with multilayer noise filtering device, it is characterised in that：The sound-absorbing part is fixed
In panel close to the outer surface of smoke machine main body；Or
The sound-absorbing part is fixed on the surface of panel and the nearest wall surface of smoke machine main body；Or
The sound-absorbing part is fixed between panel and the nearest wall surface gap of smoke machine main body.
10. the kitchen ventilator according to claim 9 with multilayer noise filtering device, it is characterised in that：The sound-absorbing part is set
It is set to multiple, sound-absorbing part and panel one-to-one correspondence；
The sound-absorbing part is fiber, PP cottons, polyester fiber, Carbon fibe or porous foam；Or
The sound-absorbing part is porous plate；
The panel is metal decking, plastic front board or alloy panel；
The panel is fixedly connected with reinforced structure；
The reinforced structure is convex closure, recessed packet or reinforcing rib；
It is 100Hz~8000Hz that the noise filtering device, which eliminates noisy frequency range,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810772831.9A CN108731070A (en) | 2018-07-14 | 2018-07-14 | A kind of kitchen ventilator with multilayer noise filtering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810772831.9A CN108731070A (en) | 2018-07-14 | 2018-07-14 | A kind of kitchen ventilator with multilayer noise filtering device |
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| CN108731070A true CN108731070A (en) | 2018-11-02 |
Family
ID=63926797
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0596846A1 (en) * | 1992-11-03 | 1994-05-11 | Aktiebolaget Electrolux | Kitchen ventilator |
| CN1917036A (en) * | 2006-09-12 | 2007-02-21 | 浙江大学 | Perforation plate for improving sound absorptivity |
| JP2007163685A (en) * | 2005-12-12 | 2007-06-28 | Nec Viewtechnology Ltd | Muffling device, and electronic equipment |
| CN101149296A (en) * | 2007-11-09 | 2008-03-26 | 北京航空航天大学 | Broad-band noise-reducing acoustic liner and its manufacture method |
| CN105509119A (en) * | 2016-02-18 | 2016-04-20 | 广东美的厨房电器制造有限公司 | Noise reduction device and extractor hood |
| CN106871204A (en) * | 2017-03-31 | 2017-06-20 | 广东美的厨房电器制造有限公司 | Range hood |
-
2018
- 2018-07-14 CN CN201810772831.9A patent/CN108731070A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0596846A1 (en) * | 1992-11-03 | 1994-05-11 | Aktiebolaget Electrolux | Kitchen ventilator |
| JP2007163685A (en) * | 2005-12-12 | 2007-06-28 | Nec Viewtechnology Ltd | Muffling device, and electronic equipment |
| CN1917036A (en) * | 2006-09-12 | 2007-02-21 | 浙江大学 | Perforation plate for improving sound absorptivity |
| CN101149296A (en) * | 2007-11-09 | 2008-03-26 | 北京航空航天大学 | Broad-band noise-reducing acoustic liner and its manufacture method |
| CN105509119A (en) * | 2016-02-18 | 2016-04-20 | 广东美的厨房电器制造有限公司 | Noise reduction device and extractor hood |
| CN106871204A (en) * | 2017-03-31 | 2017-06-20 | 广东美的厨房电器制造有限公司 | Range hood |
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Application publication date: 20181102 |
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