CN209431495U - A kind of kitchen ventilator of band self-regulation diameter noise interference device - Google Patents
A kind of kitchen ventilator of band self-regulation diameter noise interference device Download PDFInfo
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- CN209431495U CN209431495U CN201821969235.1U CN201821969235U CN209431495U CN 209431495 U CN209431495 U CN 209431495U CN 201821969235 U CN201821969235 U CN 201821969235U CN 209431495 U CN209431495 U CN 209431495U
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Abstract
A kind of kitchen ventilator of band self-regulation diameter noise interference device is provided with smoke machine main body and can automatically adjust the self-regulation diameter noise interference device of diameter according to air pressure inside, and self-regulation diameter noise interference device is assemblied in smoke machine main body.The utility model reaches the noise reduction of specific multi-frequency noise by adjusting the area of two openings of self-regulation diameter noise interference device, the entire length for the diameter noise interference device that is self-regulated or the shortest distance of two openings.The kitchen ventilator is able to maintain long-term good noise reduction effect, which has the advantages that low cost, reliability are high.The self-regulation diameter noise interference device is the resonance amplitude and phase through specific noise frequency, interferes with the noise transmitted in main air duct pipe and reaches the noise reduction of specific multi-frequency noise to lower the amplitude of this noise frequency and reduced.The material of the self-regulation diameter noise interference device is anticorrosive, resist chemical and is hardly damaged.
Description
Technical field
The utility model relates to kitchen ventilator field, in particular to a kind of oil smoke of band self-regulation diameter noise interference device
Machine.
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 kitchen ventilator
Noise reduction is also got more and more attention.
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 greater than 1000Hz
Noise reduction technology processing.However passive noise reduction is mainly by being wrapped in noise source or pipeline with acoustical cotton.But exist following several
A disadvantage: one, air pressure consume is excessive, and noise and fluid are needed across acoustical cotton, and sound can be consumed using friction, reach drop
The effect made an uproar, but air performance is reduced simultaneously.Two, it is difficult to select suitable acoustical cotton, seldom supplying factory can mention
For acoustical cotton can acoustic absorptivity at different frequencies data, therefore the manufacturing enterprise of kitchen ventilator can only continuously attempt to and mistake
In find out type or thickness of suitable acoustical cotton etc..Three, the noise reduction frequency of acoustical cotton is uncontrollable, for universal acoustical cotton
Maximum noise reduction effect cannot be reached under specified narrow frequency, different strategies can not be collocated with each other from design also to carry out more
Effective noise reduction.
Therefore in view of the shortcomings of the prior art, the kitchen ventilator for providing a kind of band self-regulation diameter noise interference device is existing to solve
There is technical deficiency very necessary.
Utility model content
The purpose of this utility model is that providing a kind of band self-regulation diameter noise in place of avoiding the deficiencies in the prior art
The kitchen ventilator of interference device.The oil smoke function of band self-regulation diameter noise interference device reduces specific multi-frequency noise.
The above-mentioned purpose of the utility model is realized by following technical measures:
A kind of kitchen ventilator of band self-regulation diameter noise interference device is provided, is provided with smoke machine main body and can be according to internal gas
The self-regulation diameter noise interference device of pressure automatic adjustment diameter, self-regulation diameter noise interference device are assemblied in smoke machine main body.
Preferably, above-mentioned self-regulation diameter noise interference device is provided with the deformations for changing diameter and interference device master
Body, deformations are assemblied in interference device main body.
The deformations are PVC deformations；Or
The deformations are rubber deformation portion；Or
The deformations are silica gel deformations；Or
The deformations are PE deformations；Or
The deformations are aluminium foil deformations；Or
The deformations are latex deformations.
Preferably, above-mentioned deformations are provided with multiple.
Preferably, the setting of above-mentioned self-regulation diameter noise interference device is there are two opening, two openings respectively with smoke machine master
The main air duct of body is connected to and the horizontal position of two openings is different.
K will be defined as close to the opening of main air duct air inlet1, K1Area be defined as M1, close to opening for main air duct air outlet
Mouth is defined as K2, K2Area be defined as M2。
The self-regulation diameter noise interference device of the utility model is made an uproar by adjusting two areas being open, self-regulation diameter
The shortest distance of the entire length of acoustic interference device or two openings reaches the noise reduction of specific multi-frequency noise.
Preferably, above-mentioned K1And K2The shortest distance be defined as Δ L, and Δ L > 5mm.
Preferably, the area of the air inlet of above-mentioned main air duct is defined as K3, K3Area be defined as M3。
Preferably, the area of the air outlet of above-mentioned main air duct is defined as K4, K4Area be defined as M4。
Preferably, above-mentioned M1=M2, M3=M4。
Preferably, above-mentioned self-regulation diameter noise interference device is provided with multiple.
Preferably, above-mentioned K1Midpoint and K2Midpoint line and main air hose axis parallel；Or
The K1Midpoint and K2Midpoint line and main air hose central axes at included angle A, and 0 ° of A≤60 ° <.
Preferably, above-mentioned smoke machine main body is additionally provided with noise filtering device, and noise filtering device is assemblied in the interior of main air duct
Surface.
Preferably, above-mentioned noise filtering device is set as being distributed with multiple for eliminating the face of the through-hole of multi-frequency noise
Plate.
Preferably, the aperture of above-mentioned through-hole is defined as d, and d≤30mm.
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 greater than 0.
Preferably, the value of above-mentioned d is multiple.
Preferably, the value of above-mentioned b is multiple.
The noise filtering device of the utility model leads to by adjusting the aperture of different through-holes or the edge of through-hole with adjacent
The edge minimum range or noise filtering device in hole reach specific unifrequency noise at a distance from smoke machine main body or multi-frequency is made an uproar
The noise reduction of sound.
A kind of kitchen ventilator of band self-regulation diameter noise interference device of the utility model, is provided with smoke machine main body and energy root
According to the self-regulation diameter noise interference device of air pressure inside automatic adjustment diameter, self-regulation diameter noise interference device is assemblied in cigarette
Owner's body.The utility model is made an uproar by adjusting area, the self-regulation diameter of two openings of self-regulation diameter noise interference device
The shortest distance of the entire length of acoustic interference device or two openings reaches the noise reduction of specific multi-frequency noise.The oil smoke function
Long-term good noise reduction effect is kept, which has the advantages that low cost, reliability are high.It should be certainly
Adjusting diameter noise interference device is the resonance amplitude and phase through specific noise frequency, with the noise transmitted in main air duct pipe
It interferes and reaches the noise reduction of specific multi-frequency noise to lower the amplitude of this noise frequency and reduced.The self-regulation is straight
The material of diameter noise interference device is anticorrosive, resist chemical and is hardly damaged.
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 structural schematic diagram of self-regulation the diameter noise interference device and main air duct of embodiment 1.
Fig. 2 is the schematic cross-section of Fig. 1.
Structural schematic diagram when Fig. 3 is the deformations expansion of self-regulation diameter noise interference device.
Fig. 4 is the self-regulation diameter noise interference device of embodiment 2 and main air duct structural schematic diagram.
Structural schematic diagram when Fig. 5 is the deformations expansion of self-regulation diameter noise interference device in Fig. 4.
Fig. 6 is the self-regulation diameter noise interference device of embodiment 3 and main air duct structural schematic diagram.
Fig. 7 is the K of embodiment 41Midpoint and K2Midpoint line and main air hose central axes at angle when signal
Figure.
Fig. 8 is K1Midpoint and K2Midpoint line and main air hose central axes at angle when schematic diagram.
Fig. 9 is the structural representation of self-regulation diameter the noise interference device, main air duct and noise filtering device of embodiment 5
Figure.
Figure 10 is the structural schematic diagram of noise filtering device in Fig. 9.
Figure 11 is the edge minimum range relation schematic diagram at the edge and adjacent through-holes of through-hole aperture and through-hole in Figure 10.
Fig. 1 includes into Figure 11:
Be self-regulated diameter noise interference device 1, deformations 11, interference device main body 12, main air duct 2,
Noise filtering device 3, through-hole 31.
Specific embodiment
The technical solution of the utility model is described further with the following Examples.
Embodiment 1.
A kind of kitchen ventilator of band self-regulation diameter noise interference device is provided with smoke machine main body and energy as shown in Figures 1 to 3
The self-regulation diameter noise interference device 1 of diameter is automatically adjusted according to air pressure inside, self-regulation diameter noise interference device 1 assembles
In smoke machine main body.
Self-regulation diameter noise interference device 1 is provided with the deformations 11 and interference device main body 12 for changing diameter, deformation
Portion 11 is assemblied in interference device main body 12.
It is silica gel deformations 11, PE deformation that the deformations 11 of the utility model, which can be PVC deformations 11, rubber deformation portion 11,
Any one of portion 11, aluminium foil deformations 11 or latex deformations 11, specific embodiment according to the actual situation depending on.This
The deformations 11 of embodiment are specially PVC deformations 11.
The kitchen ventilator of the self-regulation diameter noise interference device 1 of the utility model, when self-regulation diameter noise interference device 1
When internal pressure is greater than the largest deformation resistance of deformations 11, deformations 11 start expansion and internal diameter increases；When self-regulation diameter
When 1 internal pressure of noise interference device is less than the largest deformation resistance of deformations 11, deformations 11 are started to shrink and internal diameter reduces；
When 1 internal pressure of diameter noise interference device that is self-regulated is 0, deformations 11 restore reset condition.The deformation of the utility model
Portion 11 also becomes with self-regulation 1 internal pressure of diameter noise interference device, the internal diameter of self-regulation diameter noise interference device 1
Change, to influence the noise reduction frequency of self-regulation diameter noise interference device 1, achievees the purpose that wideband noise reduction.
Be self-regulated diameter noise interference device 1 setting there are two opening, two opening respectively with the main air duct 2 of smoke machine main body
The horizontal position of connection and two openings is different.K will be defined as close to the opening of 2 air inlet of main air duct1, K1Area be defined as
M1, the opening close to 2 air outlet of main air duct is defined as K2, K2Area be defined as M2。
The self-regulation diameter noise interference device 1 of the utility model is by adjusting two areas being open, self-regulation diameter
The shortest distance of the entire length of noise interference device 1 or two openings reaches the noise reduction of specific multi-frequency noise.
The K of the utility model1And K2The shortest distance be defined as Δ L, and Δ L > 5mm, the Δ L of the present embodiment are specially
100mm.It should be noted that the K of the utility model1And K2The shortest distance can be 100mm, or be greater than 5mm, be less than
Any distance of La, depending on specific distance is with actual conditions.
The area of the air inlet of the main air duct 2 of the utility model is defined as K3, K3Area be defined as M3；Main air duct 2 goes out
The area in air port is defined as K4, K4Area be defined as M4.The noise reduction effect and main air duct 2 of self-regulation diameter noise interference device 1
And branched pipe caliber has great relationship.The utility model is preferably M1=M2, M3=M4, can also be with M1≠M2, M3≠M4.Because
In identical cross-sectional area, i.e. M3=M4When, in M2Even if the region of lower section can reach good noise reduction effect in self-regulation diameter
The resonance phase that is formed in noise interference device 1 and amplitude some deviations, with this condition, broadband noise frequency can be effectively reduced in this
Rate.
In M3>M4When, in M2The noise reduction effect in the region of lower section is confined to specific narrow frequency noise, and noise reduction effect can poor one
A bit.This is because as long as acoustic phase and amplitude that self-regulation diameter noise interference device 1 resonates have slight deviations will be to sound
The transmitting loss of wave has significant change.In equal cross-sectional area M3=M4Under equal proportion, be self-regulated diameter noise interference device
1 slippages are Δ L/LaFunction.La is the entire length of self-regulation diameter noise interference device 1.
The principles of the present invention are as follows: self-regulation diameter noise interference device 1 (Herschel-Quincke pipe) is basis
Interference between sound wave achievees the effect that reduce sound.The diameter noise interference device 1 that is self-regulated is according to the resonance between sound wave
Achieve the effect that reduce sound with interference.Because the diameter noise interference device 1 that is self-regulated has multiple resonant frequencies: f0,1、f0,2、
fs1And fs2.The broadband noise waves that kitchen ventilator generates are propagated in main air duct 2, when encountering noise interference device, broadband noise
Wavelength-division is that first via broadband noise waves and second are had a lot of social connections frequency noise wave, and first via broadband noise waves continue in main air duct 2
Middle propagation；Second have a lot of social connections frequency noise wave enter self-regulation diameter noise interference device 1 and with self-regulation diameter self-regulation diameter
Noise interference device 1 resonates, and one of them from self-regulation diameter self-regulation diameter noise interference device 1 is open out
Import main 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
Frequency noise wave of having a lot of social connections enters self-regulation diameter noise interference device 1 and resonates with self-regulation diameter noise interference device 1,
And one of them from self-regulation diameter noise interference device 1 is open out and imports main air duct.From self-regulation diameter noise interference
The second frequency of having a lot of social connections that the first via broadband noise waves that device 1 propagates from are propagated after importing main air duct 2 with main air duct 2 is made an uproar
There are phase difference, first via broadband noise waves and the second frequency noise wave of having a lot of social connections interfere to form interference broadband and make an uproar sound wave
Sound wave, interference broadband noise waves weaken relative to the amplitude of broadband noise waves, noise reduces.
The basic frequency and velocity of sound c of self-regulation 1 target noise reduction of diameter noise interference device, self-regulation diameter noise interference device
1 length LaAnd the K of self-regulation diameter noise interference device 11And K2Shortest distance Δ L functional dependence reciprocal, it is as follows
Formula:
Wherein f is the basic frequency of self-regulation 1 target noise reduction of diameter noise interference device, and F is function representation symbol.In above formula
Expression are as follows:And N=(2p+1)/2, wherein N is subfrequency multiple, and p is arbitrary integer.
So the basic frequency of target noise reduction frequency 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 self-regulation of the utility model
Diameter noise interference device 1 can form two basic frequencies and multiple harmonic frequencies so as to mutually relate to multi-frequency noise, reach
The purpose of wideband noise reduction.
The band is self-regulated the kitchen ventilator of diameter noise interference device, is provided with smoke machine main body and can be automatic according to air pressure inside
The self-regulation diameter noise interference device 1 of diameter is adjusted, self-regulation diameter noise interference device 1 is assemblied in smoke machine main body.This reality
With the area of novel two openings by adjusting self-regulation diameter noise interference device 1, self-regulation diameter noise interference device 1
Entire length or the shortest distances of two openings reach the noise reduction of specific multi-frequency noise.The kitchen ventilator is able to maintain long-term good
Good noise reduction effect, the self-regulation diameter noise interference device 1 have the advantages that low cost, reliability are high.The self-regulation diameter
Noise interference device 1 is the resonance amplitude and phase through specific noise frequency, and the noise for managing interior transmitting with main air duct 2 is mutually dry
It relates to and reaches the noise reduction of specific multi-frequency noise to lower the amplitude of this noise frequency and reduced.The self-regulation diameter noise
The material of interference device 1 is anticorrosive, resist chemical and is hardly damaged.
Embodiment 2.
A kind of kitchen ventilator of band self-regulation diameter noise interference device, as shown in Figures 4 and 5, other features and 1 phase of embodiment
Together, the difference is that, the self-regulation diameter noise interference device 1 of the present embodiment is provided with multiple deformations 11, and specially two
It is a.
It should be noted that the deformations 11 of the utility model can be set to 2, may be set to be any greater than 1
Positive integer, the specific number of deformations 11 according to the actual situation depending on.
Compared with Example 1, multiple deformations 11 can have the kitchen ventilator for making band self-regulation diameter noise interference device
Noise reduction frequency it is wider.
Embodiment 3.
A kind of kitchen ventilator of band self-regulation diameter noise interference device, as shown in fig. 6, other features are same as Example 1,
The difference is that the self-regulation diameter noise interference device 1 of the present embodiment be provided with it is multiple, specially 4.
It should be noted that the self-regulation diameter of the kitchen ventilator with self-regulation diameter noise interference device of the utility model is made an uproar
Acoustic interference device 1 can be set to 4, may be set to be any positive integer greater than 1, and be self-regulated diameter noise interference device
1 specific number according to the actual situation depending on.
Compared with Example 1, the noise reduction effect of the kitchen ventilator with multiple self-regulation diameter noise interference devices 1 is more preferable.
Embodiment 4.
A kind of kitchen ventilator of band self-regulation diameter noise interference device, as shown in fig. 7, other features are same as Example 1,
The difference is that the K of the present embodiment1Midpoint and K2Midpoint line and main air hose axis parallel.Through many experiments
Verifying, works as K1Midpoint and K2Midpoint line and main air hose axis parallel when, noise reduction effect is best.
It should be noted that the utility model may be K1Midpoint and K2Midpoint line and main air hose central axes
At included angle A, and 0 ° of A≤60 ° <, as shown in figure 8, specific embodiment according to the actual situation depending on.
Embodiment 5.
A kind of kitchen ventilator of band self-regulation diameter noise interference device, as shown in Figs. 9 to 11, other features and embodiment 1
It is identical, the difference is that, the smoke machine main body of the utility model is additionally provided with noise filtering device 3, and noise filtering device 3 assembles
In the inner surface of main air duct 2.
Noise filtering device 3 is set as being distributed with multiple for eliminating the panel of the through-hole 31 of multi-frequency noise.
The aperture of through-hole 31 is defined as d, and d≤30mm.The value of d is multiple.
The edge of through-hole 31 and the edge minimum range of adjacent through-holes 31 are b, and b is the arbitrary value greater than 0.The value of b is more
It is a.
In the constant situation of aperture d, the smaller elimination of value of the edge minimum range b at the edge and adjacent through-holes 31 of through-hole 31
Target noise frequency it is bigger.Under the edge of through-hole 31 and the constant situation of edge minimum range b of adjacent through-holes 31, aperture
The smaller target noise frequency to be eliminated of the value of d is with regard to smaller.
It should be noted that when the value of value and d for b is unique, it can be to specific unifrequency noise noise reduction.But work as b
It can be according to the two value with being combined into specific unifrequency noise or multi-frequency noise noise reduction when with d being multiple and different values.B's
Value and the number of value of d, size according to the actual situation depending on.
The utility model is by adjusting the aperture of different through-holes 31 or the edge at the edge of through-hole 31 and adjacent through-holes 31
Minimum range or noise filtering device 3 reach the drop of specific unifrequency noise or multi-frequency noise at a distance from smoke machine main body
It makes an uproar.
The denoising device principle of the utility model is such that noise filtering device 3 can be in limited closed main air duct 2
It is interior, when noise source travels to noise filtering device 3, carry out noise reduction.Sound wave is usually touching noise filtering device 3 with negative side
To propagation, so most incidence wave can be interfered with back wave.Noise filtering device 3 is carried out using the principle of resonance
Noise reduction, the noise filtering device 3 of specific noise frequency and the target frequency of setting in space form covibration.Work as resonance
When generation, the sound wave of oscillation can intensely pierce into out through-hole 31 back and forth in air, and the sound of noise can be converted in the process
At friction loss, achieve the effect that eliminate target frequency noise.
The kitchen ventilator of the utility model can by adjusting different through-holes 31 aperture or through-hole 31 edge with it is adjacent
The edge minimum range or noise filtering device 3 of through-hole 31 reach specific unifrequency noise or multifrequency at a distance from smoke machine main body
The noise reduction purpose of rate noise.
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 (10)
1. a kind of kitchen ventilator of band self-regulation diameter noise interference device, it is characterised in that: it is provided with smoke machine main body and energy basis
Air pressure inside automatically adjusts the self-regulation diameter noise interference device of diameter, and self-regulation diameter noise interference device is assemblied in smoke machine
Main body.
2. the kitchen ventilator of band self-regulation diameter noise interference device according to claim 1, it is characterised in that: the self-regulated
Section diameter noise interference device is provided with the deformations and interference device main body for changing diameter, and deformations are assemblied in interference device master
Body.
3. the kitchen ventilator of band self-regulation diameter noise interference device according to claim 2, it is characterised in that: the deformation
Portion is PVC deformations；Or
The deformations are rubber deformation portion；Or
The deformations are silica gel deformations；Or
The deformations are PE deformations；Or
The deformations are aluminium foil deformations；Or
The deformations are latex deformations.
4. the kitchen ventilator of band self-regulation diameter noise interference device according to claim 3, it is characterised in that: the deformation
Portion is provided with multiple.
5. the kitchen ventilator with self-regulation diameter noise interference device according to claim 3 or 4, it is characterised in that: institute
The setting of self-regulation diameter noise interference device is stated there are two opening, two openings are connected to the main air duct of smoke machine main body and two respectively
The horizontal position of a opening is different；
K will be defined as close to the opening of main air duct air inlet1, K1Area be defined as M1, the opening close to main air duct air outlet is fixed
Justice is K2, K2Area be defined as M2。
6. the kitchen ventilator of band self-regulation diameter noise interference device according to claim 5, it is characterised in that: the self-regulated
Save diameter noise interference device by adjusting two be open areas, be self-regulated diameter noise interference device entire length or
The shortest distance of two openings reaches the noise reduction of specific multi-frequency noise；
The K1And K2The shortest distance be defined as Δ L, and Δ L > 5mm.
7. the kitchen ventilator of band self-regulation diameter noise interference device according to claim 6, it is characterised in that: the main wind
The area of the air inlet in road is defined as K3, K3Area be defined as M3；
The area of the air outlet of the main air duct is defined as K4, K4Area be defined as M4；
The M1=M2, M3=M4；
The self-regulation diameter noise interference device is provided with multiple.
8. the kitchen ventilator of band self-regulation diameter noise interference device according to claim 7, it is characterised in that: the K1's
Midpoint and K2Midpoint line and main air hose axis parallel；Or
The K1Midpoint and K2Midpoint line and main air hose central axes at included angle A, and 0 ° of A≤60 ° <.
9. the kitchen ventilator of band self-regulation diameter noise interference device according to claim 8, it is characterised in that: the smoke machine
Main body is additionally provided with noise filtering device, and noise filtering device is assemblied in the inner surface of main air duct；
The noise filtering device is set as being distributed with multiple for eliminating the panel of the through-hole of multi-frequency noise.
10. the kitchen ventilator of band self-regulation diameter noise interference device according to claim 9, it is characterised in that: it is described logical
The aperture in hole is defined as d, and d≤30mm；
The edge of the through-hole and the edge minimum range of adjacent through-holes are b, and b is the arbitrary value greater than 0；
The value of the d is multiple；
The value of the b is multiple；
The noise filtering device is minimum by adjusting the aperture of different through-holes or the edge of through-hole and the edge of adjacent through-holes
Distance or noise filtering device reach the noise reduction of specific unifrequency noise or multi-frequency noise at a distance from smoke machine main body.
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| CN201821969235.1U CN209431495U (en) | 2018-11-27 | 2018-11-27 | A kind of kitchen ventilator of band self-regulation diameter noise interference device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237116A (en) * | 2021-06-30 | 2021-08-10 | 华帝股份有限公司 | Self-cleaning sensing device of range hood and control method thereof |
| WO2022111280A1 (en) * | 2020-11-30 | 2022-06-02 | 广东美的白色家电技术创新中心有限公司 | Range hood |
-
2018
- 2018-11-27 CN CN201821969235.1U patent/CN209431495U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022111280A1 (en) * | 2020-11-30 | 2022-06-02 | 广东美的白色家电技术创新中心有限公司 | Range hood |
| CN114576661A (en) * | 2020-11-30 | 2022-06-03 | 广东美的白色家电技术创新中心有限公司 | Smoke machine |
| CN113237116A (en) * | 2021-06-30 | 2021-08-10 | 华帝股份有限公司 | Self-cleaning sensing device of range hood and control method thereof |
| CN113237116B (en) * | 2021-06-30 | 2022-10-14 | 华帝股份有限公司 | Self-cleaning sensing device of range hood and control method thereof |
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