CN209657798U - A kind of noise reduction household electrical appliance and air purifier, fan, vacuum cleaner and Blowing drum - Google Patents
A kind of noise reduction household electrical appliance and air purifier, fan, vacuum cleaner and Blowing drum Download PDFInfo
- Publication number
- CN209657798U CN209657798U CN201821962596.3U CN201821962596U CN209657798U CN 209657798 U CN209657798 U CN 209657798U CN 201821962596 U CN201821962596 U CN 201821962596U CN 209657798 U CN209657798 U CN 209657798U
- Authority
- CN
- China
- Prior art keywords
- noise
- noise interference
- interference device
- household electrical
- noise reduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
A kind of noise reduction household electrical appliance, are provided with electric appliance main body and the noise interference device for reducing multi-frequency noise, and noise interference device is assemblied in electric appliance main body.The utility model reaches the noise reduction of specific multi-frequency noise by noise interference device by adjusting the shortest distance of two areas being open, the entire length in noise interference channel or two openings.The household electrical appliance are able to maintain long-term good noise reduction effect, which has the advantages that low cost, reliability are high.The noise interference device is that the noise that transmits interferes and reaches the noise reduction of specific multi-frequency noise to lower the amplitude of this noise frequency and reduced in resonance amplitude and phase, with wind channel tube through specific noise frequency.The material of the noise interference device is anticorrosive, resist chemical and is hardly damaged.The utility model provides a kind of air purifier, a kind of fan, a kind of vacuum cleaner and a kind of air duct simultaneously.
Description
Technical field
The utility model relates to household appliance technical field, in particular to a kind of noise reduction household electrical appliance and air purifier, fan,
Vacuum cleaner and Blowing drum.
Background technique
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 household electrical appliance
Noise reduction also get more and more attention.
Household electrical appliance noise reduction in the prior art is mostly the drop that noise is realized by active noise reduction and passive noise reduction mode
It is low.Active noise reduction mode can only act on noise of the frequency within 1000Hz, and the noise greater than 1000Hz can only be passed through
Passive noise reduction technology processing.However passive noise reduction is mainly by being wrapped in noise source or pipeline with acoustical cotton.But exist such as
Under several disadvantages: one, air pressure consume is excessive, and noise and fluid are needed across acoustical cotton, and sound can be consumed using friction, reached
To the effect of noise reduction, but air performance is reduced simultaneously.Two, it is difficult to select suitable acoustical cotton, seldom supplies factory's energy
Enough provide acoustical cotton can acoustic absorptivity at different frequencies data, therefore the manufacturing enterprise of household electrical appliance can only continuously attempt to
With the type or thickness etc. for finding out suitable acoustical cotton in mistake.Three, the noise reduction frequency of acoustical cotton is uncontrollable, for universal
Acoustical cotton cannot reach maximum noise reduction effect under specified narrow frequency, can not be also collocated with each other from design different strategies with
Carry out more effective noise reduction.
Therefore in view of the shortcomings of the prior art, providing a kind of noise reduction household electrical appliance and air purifier, fan, vacuum cleaner and blowing
Air duct is very necessary to solve prior art deficiency.
Utility model content
First purpose of the utility model is to avoid the deficiencies in the prior art place and provide a kind of noise reduction household electric
Device.The noise reduction household electrical appliance can reduce specific multi-frequency noise.
The above-mentioned purpose of the utility model is realized by following technical measures:
A kind of noise reduction household electrical appliance are provided, electric appliance main body is provided with and are filled for reducing the noise interference of multi-frequency noise
It sets, noise interference device is assemblied in electric appliance main body.
Preferably, there are two opening and noise interference channel, noise interference channel passes through for above-mentioned noise interference device setting
Two openings are connected to the air duct of electric appliance main body.
Preferably, above-mentioned noise interference device is embedded noise interference device.
Preferably, above-mentioned embedded noise interference device is the wall surface in air duct；Or
The embedded noise interference device is assemblied in the wall surface in air duct.
Another preferred, above-mentioned noise interference device is exposed noise interference device.
Preferably, above-mentioned noise interference device is by adjusting two areas being open, the entire length in noise interference channel
Or the shortest distance of two openings reaches the noise reduction of specific multi-frequency noise.
Preferably, the length in above-mentioned noise interference channel is defined as La, and 0 < La≤1000mm。
Preferably, above-mentioned K1And K2The shortest distance be defined as Δ L, and La> Δ L > 5mm.
Preferably, the shape of the cross section in above-mentioned noise interference channel be circle, ellipse, rectangle, triangle, diamond shape or
Arbitrary shape of the person in addition to above-mentioned shape.
Preferably, the diameter in above-mentioned noise interference channel is D, and 0 < D≤100mm.
Preferably, the value of above-mentioned D is multiple.
Preferably, above-mentioned noise interference channel is provided with a plurality of.
A kind of noise reduction household electrical appliance of the utility model, are provided with electric appliance main body and the noise for reducing multi-frequency noise
Interference device, noise interference device are assemblied in electric appliance main body.The utility model is opened by noise interference device by adjusting two
The shortest distances of the area of mouth, the entire length in noise interference channel or two openings reach the drop of specific multi-frequency noise
It makes an uproar.The household electrical appliance are able to maintain long-term good noise reduction effect, which has high excellent of low cost, reliability
Point.The noise interference device is that the noise that transmits is mutual in resonance amplitude and phase, with wind channel tube through specific noise frequency
Interfere to lower the amplitude of this noise frequency, the noise reduction for reaching specific multi-frequency noise is reduced.The noise interference device
Material be anticorrosive, resist chemical and to be hardly damaged.
Second purpose of the utility model is to avoid the deficiencies in the prior art place and provide a kind of air purifier.
The air purifier can reduce specific multi-frequency noise and be reduced.
The above-mentioned purpose of the utility model is realized by following technical measures:
A kind of air purifier is provided, electric appliance main body and noise interference device such as features described above are provided with.
The third purpose of the utility model is to avoid the deficiencies in the prior art place and provide a kind of fan.The fan
Specific multi-frequency noise, which can be reduced, to be reduced.
The above-mentioned purpose of the utility model is realized by following technical measures:
A kind of fan is provided, electric appliance main body and noise interference device such as features described above are provided with.
4th purpose of the utility model is to avoid the deficiencies in the prior art place and provide a kind of vacuum cleaner.The suction
Dirt function reduces specific multi-frequency noise and is reduced.
The above-mentioned purpose of the utility model is realized by following technical measures:
A kind of vacuum cleaner is provided, electric appliance main body and noise interference device such as features described above are provided with.
5th purpose of the utility model is to avoid the deficiencies in the prior art place and provide a kind of air duct.The air duct
Specific multi-frequency noise, which can be reduced, to be reduced.
The above-mentioned purpose of the utility model is realized by following technical measures:
A kind of air duct is provided, electric appliance main body and noise interference device such as features described above are provided with.
Detailed description of the invention
The utility model is further described using attached drawing, but the content in attached drawing is not constituted to the utility model
Any restrictions.
Fig. 1 is the noise interference device of embodiment 1 and the structural schematic diagram in air duct.
Fig. 2 is the schematic cross-section of Fig. 1.
Fig. 3 is the length L in noise interference channelaSchematic diagram.
Fig. 4 is the schematic diagram of the shortest distance Δ L of two openings.
Fig. 5 is the schematic diagram of the shape of the cross section in noise interference channel, and (1) in Fig. 5 is circle, and (2) in Fig. 5 are
Ellipse, (3) in Fig. 5 are rectangle, and (4) in Fig. 5 are triangle, and (5) in Fig. 5 are diamond shape, and (6) in Fig. 5 are any
Shape, (7) in Fig. 5 are arbitrary shape, and (8) in Fig. 5 are arbitrary shape.
Fig. 6 is the schematic diagram of the diameter D in noise interference channel.
Fig. 7 is the noise interference device of embodiment 2 and the structural schematic diagram in air duct.
Fig. 8 is the noise interference device of embodiment 3 and the structural schematic diagram in air duct.
Fig. 9 is the structural schematic diagram of noise filtering device in Fig. 8.
Figure 10 is the structural schematic diagram in the air duct of embodiment 4.
Figure 11 is a kind of air purifier structural schematic diagram of embodiment 5.
Figure 12 is the schematic cross-section of Figure 11.
Figure 13 is the noise interference device of Figure 11 and the structural schematic diagram in air duct.
Figure 14 is a kind of Blowing drum perspective view of embodiment 6.
Figure 15 is a kind of Blowing drum structure chart of embodiment 7.
Figure 16 is a kind of vacuum cleaner perspective view of embodiment 9.
Figure 17 is a kind of structural schematic diagram of vacuum cleaner of embodiment 10.
Figure 18 is the enlarged diagram of the Z region in Figure 17.
Figure 19 is a kind of fan structure diagram of embodiment 8.
Fig. 1 includes into Figure 19:
Noise interference device 1, noise interference channel 11,
Air duct 2.
Specific embodiment
The technical solution of the utility model is described further with the following Examples.
Embodiment 1.
A kind of noise reduction household electrical appliance are provided with electric appliance main body and making an uproar for reducing multi-frequency noise as shown in Figures 1 to 6
Acoustic interference device 1, noise interference device 1 are assemblied in electric appliance main body.
There are two opening and noise interference channel 11, noise interference channels 11 to be opened by two for the setting of noise interference device 1
Mouth is connected to the air duct 2 of electric appliance main body.
Noise interference device 1 is exposed noise interference device 1.
Noise interference device 1 is by adjusting two areas being open, the entire length in noise interference channel 11 or two
The shortest distance of opening reaches the noise reduction of specific multi-frequency noise.
The length of the noise interference device 1 of the utility model is defined as La, and 0 < La≤ 1000mm, the L of the present embodimentaTool
Body is 300mm.
It should be noted that the length of the noise interference device 1 of the utility model can be 300mm, or it is greater than 0,
Random length less than 1000mm, depending on specific length is with actual conditions.
The shortest distance of two openings of the utility model is defined as Δ L, and La> Δ L > 5mm, the Δ L of the present embodiment
Specially 100mm.
It should be noted that two of the utility model shortest distances being open can be 100mm, or it is greater than 5mm,
Less than LaAny distance, depending on specific distance is with actual conditions.
The cross section in the noise interference channel 11 of the utility model it is conveniently of circular shape, or ellipse, square
Shape, triangle, diamond shape or the arbitrary shape in addition to above-mentioned shape, the shape of specific cross section according to the actual situation and
It is fixed.
The cross section in the noise interference channel 11 of the utility model is circle, as shown in (1) in Fig. 5.
The cross section in the noise interference channel 11 of the utility model is ellipse, as shown in (2) in Fig. 5.
The cross section in the noise interference channel 11 of the utility model is rectangle, as shown in (3) in Fig. 5.It should be noted that
Rectangle in the utility model is not limited to this rectangle of (3) in Fig. 5, other rectangles also comply with the utility model rectangle
It is required that also within the protection scope of the present utility model.
The cross section in the noise interference channel 11 of the utility model is triangle, as shown in (4) in Fig. 5.
The cross section in the noise interference channel 11 of the utility model is diamond shape, as shown in (5) in Fig. 5.
The cross section in the noise interference channel 11 of the utility model is arbitrary shape, such as (6) in Fig. 5, (7) in Fig. 5
It is shown with (8) in Fig. 5.It should be noted that the arbitrary shape in the utility model is not limited to (6) in Fig. 5, in Fig. 5
(7) this 3 kinds of rectangles of (8) and in Fig. 5, other arbitrary shapes also comply with the requirement of the utility model arbitrary shape, also at this
In the protection scope of utility model.
The cross section in noise interference channel 11 is round or ellipse etc. without angular shape, it is possible to reduce sound wave exists
The loss of the energy of noise interference device 1 to improve the effect with noise source sound wave interference, and then improves the effect of noise reduction.
The diameter in the noise interference channel 11 of the utility model is D, and 0 < D≤100mm, and wherein the value of D is multiple.With
For the present embodiment, the shape of the cross section in noise interference channel 11 is circle, and the value of D be it is multiple, i.e. the present embodiment is made an uproar
The cross section in acoustic interference channel 11 is the circular noise interference channel 11 of multiple and different diameters.
The principles of the present invention are as follows: noise interference device 1 (Herschel-Quincke pipe) is according between sound wave
Interference achievees the effect that reduce sound.Noise interference device 1 be according between sound wave resonance and interference reach reduce sound
Effect.Because noise interference device 1 has multiple resonant frequencies: f0,1、f0,2、fs1And fs2.The broadband noise that kitchen ventilator generates
Wave is propagated in air duct 2, and when encountering noise interference device, broadband noise waves are divided into first via broadband noise waves and the second tunnel
Broadband noise waves, the continuation of first via broadband noise waves are propagated in air duct 2；Second has a lot of social connections, and to enter noise dry for frequency noise wave
Relate to device 1 and resonate with noise interference device 1, and from noise interference device one of them be open out import air duct 2.
When the second frequency noise wave of having a lot of social connections has and f0,1、f0,2、fs1And fs2When same or similar frequency, second has a lot of social connections frequency noise
Wave enters noise interference device 1 and resonates with noise interference device 1, and from one of opening of noise interference device 1
Main air duct is imported out.From the first via broadband noise waves that noise interference device 1 propagates from after importing air duct 2 with air duct
2 propagate second have a lot of social connections frequency noise wave there are phase difference, first via broadband noise waves and second are had a lot of social connections frequency noise wave hair
Raw interference forms interference broadband noise waves, interferes broadband noise waves to weaken relative to the amplitude of broadband noise waves, noise
It reduces.
The length L of the basic frequency of 1 target noise reduction of noise interference device and velocity of sound c, noise interference device 1aAnd noise is dry
Relate to the K of device 11And K2Shortest distance Δ L functional dependence reciprocal, such as following formula:
Wherein f is the basic frequency of 1 target noise reduction of noise interference device, and F is function representation symbol.So target noise reduction frequency
The basic frequency of rate is expressed as f0,1And f0,2, subfrequency fs1And fs2It can indicate are as follows:
fs1=[3f0,1,5f0,1,...........,xf0,1],
fs2=[2f0,2,3f0,2,...........,yf0,2],
Wherein ∞ >=x >=2m+1, m=1,2,3....., ∞, wherein ∞ >=y >=2, because the bright noise of the utility model is dry
Two basic frequencies and multiple harmonic frequencies can be formed so as to mutually relate to multi-frequency noise by relating to device 1, reach wideband noise reduction
Purpose.
The noise reduction household electrical appliance are provided with electric appliance main body and the noise interference device 1 for reducing multi-frequency noise, noise
Interference device 1 is assemblied in electric appliance main body.There are two opening and noise interference channel 11, noise interferences for the setting of noise interference device 1
Channel 11 is connected to by two openings with the air duct 2 of electric appliance main body.The noise interference device 1 of the utility model is by adjusting two
The shortest distance of the area of opening, the entire length in noise interference channel 11 or two openings reaches specific multi-frequency noise
Noise reduction.The household electrical appliance are able to maintain long-term good noise reduction effect, which has low cost, reliability high
Advantage.The noise interference device 1 is the resonance amplitude and phase through specific noise frequency, with the noise phase transmitted in air duct 2
Mutually interfere to lower the amplitude of this noise frequency, the noise reduction for reaching specific multi-frequency noise is reduced.Noise interference dress
The material for setting 1 is anticorrosive, resist chemical and is hardly damaged.
Embodiment 2.
A kind of noise reduction household electrical appliance, as shown in fig. 7, other features are same as Example 1, the difference is that, this is practical
Novel noise interference channel 11 is provided with multiple.The noise interference channel 11 for specifically originally applying example is set as 4.
It should be noted that the noise interference channel 11 of the utility model can be set to 4, may be set to be greater than 2
Arbitrary number, depending on actual conditions.
The parameter in multiple noise interference channels 11 of the present embodiment can be the same or different.The parameter that difference is
Noise interference device 1, the specific different f of the basic frequency in different noise interference channels 110,1And f0,2, therefore can reduce wider
The noise of frequency.Noise interference channel 11 with identical parameters can be improved the noise reduction effect of identical frequency.
Embodiment 3.
A kind of noise reduction household electrical appliance, as shown in FIG. 8 and 9, other features are same as Example 2, the difference is that, this reality
The noise interference device 1 for applying example is embedded noise interference device 1, and embedded noise interference device 1 is assemblied in the wall in air duct 2
Face.
Compared with example 1, the not exposed appearance of noise interference device 1 is more succinct.Embedded noise interference device 1 is in technique
Assembling, production fit on is simpler and more saves the time, while reliability is promoted, because connecting component is reduced, it is easier to realize
Leakproof.
Embodiment 4.
A kind of noise reduction household electrical appliance, as shown in Figure 10, other features are same as Example 2, the difference is that, this implementation
The noise interference device 1 of example is embedded noise interference device 1, and noise interference device 1 is the wall surface in air duct 2.The present embodiment
Noise interference channel 11 is set as 2.
Compared with Example 5, noise interference device 1 is directly processed into the pipe of exhaust nozzle 21, can be by exhaust nozzle 21
Pipe and noise interference device 1 are combined into one, while reducing exposed volume, keep integral product appearance more succinct, integral structure
Noise interference device in technique assembling, production fit on is simpler, more saves the time.
Embodiment 5.
A kind of air purifier has electric appliance main body as described in example 2 and noise interference device as shown in Figure 11 to 13
1.The present embodiment noise interference device 1 is exposed noise interference device 1.
The air purifier can reduce the multi-frequency noise generated when running, to greatly improve the experience of user
Sense.
Embodiment 6.
A kind of Blowing drum has electric appliance main body as described in example 4 and noise interference device 1 as shown in figure 14.Originally example is applied
Noise interference channel 11 be set as 6.The noise interference device 1 of the present embodiment is exposed noise interference device 1.
The Blowing drum can reduce the multi-frequency noise generated when running, to greatly improve the experience sense of user.
Embodiment 7.
A kind of Blowing drum has electric appliance main body as described in example 2 and noise interference device 1 as shown in figure 15.Originally example is applied
Noise interference channel 11 be set as 6.The noise interference device 1 of the present embodiment is exposed noise interference device 1.
The Blowing drum can reduce the multi-frequency noise generated when running, to greatly improve the experience sense of user.
Embodiment 8.
A kind of fan has electric appliance main body as described in example 2 and noise interference device 1 as shown in figure 19.Originally example is applied
Noise interference channel 11 is set as 6.The noise interference device 1 of the present embodiment is exposed noise interference device 1.
The fan can reduce the multi-frequency noise generated when running, to greatly improve the experience sense of user.
Embodiment 9.
A kind of vacuum cleaner has electric appliance main body as described in example 4 and noise interference device 1 as shown in figure 16.Originally example is applied
Noise interference channel 11 be set as 6.The noise interference device 1 of embodiment is embedded noise interference device 1, embedded to make an uproar
Acoustic interference device 1 is the wall surface in air duct 2.
The vacuum cleaner can reduce the multi-frequency noise generated when running, to greatly improve the experience sense of user.
Embodiment 10.
A kind of vacuum cleaner has electric appliance main body as described in example 2 and noise interference device 1 as shown in FIG. 17 and 18.This
The noise interference channel 11 for applying example is set as 6.The noise interference device 1 of the present embodiment is exposed noise interference device 1.
The vacuum cleaner can reduce the multi-frequency noise generated when running, to greatly improve the experience sense of user.
Finally it should be noted that above embodiments are only to illustrate the technical solution of the utility model rather than to this is practical
The limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, the common skill of this field
Art personnel, which should be appreciated that, can be modified or replaced equivalently technical solutions of the utility model, practical new without departing from this
The spirit and scope of type technical solution.
Claims (13)
1. a kind of noise reduction household electrical appliance, it is characterised in that: it is provided with electric appliance main body and is done for reducing the noise of multi-frequency noise
Device is related to, noise interference device is assemblied in electric appliance main body；
There are two opening and noise interference channel, noise interference channels to pass through two openings and electricity for the noise interference device setting
The air duct of device main body is connected to.
2. noise reduction household electrical appliance according to claim 1, it is characterised in that: the noise interference device is embedded noise
Interference device；
The embedded noise interference device is the wall surface in air duct；Or
The embedded noise interference device is assemblied in the wall surface in air duct.
3. noise reduction household electrical appliance according to claim 1, it is characterised in that: the noise interference device is exposed noise
Interference device.
4. according to noise reduction household electrical appliance described in claim 2 or 3, it is characterised in that: the noise interference device passes through tune
Area, the entire length in noise interference channel or the shortest distance of two openings of whole two openings reach specific multi-frequency and make an uproar
The noise reduction of sound.
5. noise reduction household electrical appliance according to claim 4, it is characterised in that: the length in the noise interference channel is defined as
La, and 0 < La≤1000mm。
6. noise reduction household electrical appliance according to claim 5, it is characterised in that: the shortest distance of described two openings is defined as
Δ L, and La> Δ L > 5mm.
7. noise reduction household electrical appliance according to claim 6, it is characterised in that: the shape of the cross section in the noise interference channel
Shape is circle, ellipse, rectangle, triangle or diamond shape.
8. noise reduction household electrical appliance according to claim 7, it is characterised in that: the diameter in the noise interference channel is D, and
0 < D≤100mm.
9. noise reduction household electrical appliance according to claim 8, it is characterised in that: the value of the D is multiple；
The noise interference channel is provided with a plurality of.
10. electric appliance main body and noise interference device just like claim 1 to 9 is arranged in a kind of air purifier.
11. electric appliance main body and noise interference device just like claim 1 to 9 is arranged in a kind of fan.
12. electric appliance main body and noise interference device just like claim 1 to 9 is arranged in a kind of vacuum cleaner.
13. electric appliance main body and noise interference device just like claim 1 to 9 is arranged in a kind of Blowing drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821962596.3U CN209657798U (en) | 2018-11-27 | 2018-11-27 | A kind of noise reduction household electrical appliance and air purifier, fan, vacuum cleaner and Blowing drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821962596.3U CN209657798U (en) | 2018-11-27 | 2018-11-27 | A kind of noise reduction household electrical appliance and air purifier, fan, vacuum cleaner and Blowing drum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209657798U true CN209657798U (en) | 2019-11-19 |
Family
ID=68517182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821962596.3U Active CN209657798U (en) | 2018-11-27 | 2018-11-27 | A kind of noise reduction household electrical appliance and air purifier, fan, vacuum cleaner and Blowing drum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209657798U (en) |
-
2018
- 2018-11-27 CN CN201821962596.3U patent/CN209657798U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201474756U (en) | Single-row gas pipe muffler for diesel generator | |
| CN202690540U (en) | Broadband silencer for fan | |
| EP3492825A1 (en) | Method for producing silencing device, silencing device and air purifier | |
| US20200141295A1 (en) | Vacuum Cleaner and Electric Motor Module Thereof | |
| CN209657798U (en) | A kind of noise reduction household electrical appliance and air purifier, fan, vacuum cleaner and Blowing drum | |
| CN109373395A (en) | A kind of casing of kitchen ventilator and kitchen ventilator with noise interference device | |
| CN108731081A (en) | A kind of kitchen ventilator with noise filtering function exhausting component | |
| CN209431495U (en) | A kind of kitchen ventilator of band self-regulation diameter noise interference device | |
| CN108731078A (en) | A kind of kitchen ventilator with noise filtering function bellows | |
| CN204471969U (en) | A kind of acoustical cotton | |
| CN209655385U (en) | A kind of kitchen ventilator spiral case and kitchen ventilator with noise interference device | |
| CN209622881U (en) | A kind of kitchen ventilator exhaust nozzle pipe of the embedded noise interference device of band | |
| CN209655387U (en) | A kind of kitchen ventilator of multi-frequency noise interference device | |
| CN109780603A (en) | A kind of kitchen ventilator spiral case and kitchen ventilator with noise interference device | |
| CN109373402A (en) | A kind of kitchen ventilator exhaust nozzle pipe of the embedded noise interference device of band | |
| CN209540966U (en) | A kind of kitchen ventilator with noise filtering function exhausting component | |
| CN211202430U (en) | Broadband silencer for centrifugal fan | |
| CN209622882U (en) | A kind of kitchen ventilator of the embedded noise interference device of band | |
| CN109373397A (en) | A kind of kitchen ventilator exhaust nozzle pipe of band self-regulation noise interference device | |
| CN208431852U (en) | A kind of kitchen ventilator with water conservancy diversion noise filtering device | |
| CN209655386U (en) | A kind of kitchen ventilator of wide frequency noise interference device | |
| CN208832564U (en) | A kind of active noise reducing device applied to smoke machine | |
| CN109373396A (en) | A kind of kitchen ventilator with noise interference device | |
| CN109373398A (en) | A kind of kitchen ventilator exhaust nozzle pipe with noise interference device | |
| CN209744442U (en) | Range hood with noise interference device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |