CN109373401A - A kind of kitchen ventilator and noise-reducing design method of multi-frequency noise interference device - Google Patents
A kind of kitchen ventilator and noise-reducing design method of multi-frequency noise interference device Download PDFInfo
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- CN109373401A CN109373401A CN201811420952.3A CN201811420952A CN109373401A CN 109373401 A CN109373401 A CN 109373401A CN 201811420952 A CN201811420952 A CN 201811420952A CN 109373401 A CN109373401 A CN 109373401A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 45
- 230000009467 reduction Effects 0.000 claims abstract description 44
- 239000000779 smoke Substances 0.000 claims description 28
- 229910003460 diamond Inorganic materials 0.000 claims description 18
- 239000010432 diamond Substances 0.000 claims description 18
- 229920000742 Cotton Polymers 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000000644 propagated effect Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008451 emotion Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Classifications
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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
- F24C15/2021—Arrangement or mounting of control or safety systems
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- Acoustics & Sound (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Aviation & Aerospace Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
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Abstract
A kind of kitchen ventilator of multi-frequency noise interference device reaches the noise reduction of specific multi-frequency noise by adjusting the shortest distance of the area of two openings of noise interference device, the entire length of noise interference device or 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 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 noise interference device is anticorrosive, resist chemical and is hardly damaged.A kind of noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device, part there are two specifically including, it is the design of noise interference device and the design of noise filtering device respectively, target noise reduction frequency can determine by the parameter of setting noise interference device and noise filtering device respectively.
Description
Technical field
The present invention relates to kitchen ventilator field, in particular to a kind of the kitchen ventilator and noise-reducing design of multi-frequency noise interference device
Method.
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, providing the kitchen ventilator and noise-reducing design method of a kind of multi-frequency noise interference device
It is very necessary to solve prior art deficiency.
Summary of the invention
A kind of multi-frequency noise interference dress is provided it is an object of the present invention to avoiding the deficiencies in the prior art place
The kitchen ventilator set.The oil smoke function of the multi-frequency noise interference device reduces specific multi-frequency noise.
Above-mentioned purpose of the invention is realized by following technical measures:
A kind of kitchen ventilator of multi-frequency noise interference device is provided, is provided with smoke machine main body and for reducing multi-frequency noise
Noise interference device, noise interference device is assemblied in smoke machine main body.
There are two opening, two openings are connected to the main air duct of smoke machine main body and two respectively for noise interference device setting
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, close to opening for main air duct air outlet
Mouth is defined as K2, K2Area be defined as M2, the area of the air inlet of main air duct is defined as K3, K3Area be defined as M3, main wind
The area of road air outlet is defined as K4, K4Area be defined as M4, and M1≤M3, M2≤M4。
Preferably, above-mentioned main air duct and noise interference device communicating position are provided with first through hole.
Preferably, above-mentioned first through hole is provided with multiple.
Preferably, above-mentioned noise interference device is by adjusting the areas of two openings, the entire length of noise interference device
Or the shortest distance of two openings reaches the noise reduction of specific multi-frequency noise.
Preferably, the shape of above-mentioned first through hole is circle, ellipse, triangle, square, rectangle, pentagon, six
At least one of side shape, diamond shape or irregular shape.
Preferably, above-mentioned first through hole is distributed in main air duct and noise interference device communicating position by arrangement region.
Preferably, above-mentioned arrangement region be rounded projections arranged, square arrangement, diamond array or in addition to above-mentioned three kinds arrange
At least one of polygonal arrangement.
Preferably, the length of above-mentioned noise interference device 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, above-mentioned M1=M2, M3=M4。
Preferably, the shape of the cross section of above-mentioned noise interference device be circle, ellipse, rectangle, triangle, diamond shape or
Arbitrary shape of the person in addition to above-mentioned shape.
Preferably, above-mentioned noise interference device is provided with multiple.
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 second through-hole of multi-frequency noise
Panel.
Preferably, the aperture of above-mentioned second through-hole is defined as d, and d≤30mm.
Preferably, the edge minimum range of the edge of above-mentioned second through-hole and adjacent second through-hole is b, and b is appointing greater than 0
Meaning value.
Preferably, the value of above-mentioned d is multiple.
Preferably, the value of above-mentioned b is multiple.
Noise filtering device of the invention is by adjusting the different apertures of second through-hole or the edge and phase of the second through-hole
The edge minimum range or noise filtering device of adjacent second through-hole reach at a distance from smoke machine main body specific unifrequency noise or
The noise reduction of multi-frequency noise.
Preferably, there are gaps between above-mentioned noise filtering device and the inner surface of main air duct, by the distance definition in gap
For H1。
Preferably, above-mentioned smoke machine main body is additionally provided with sound-absorbing part, and sound-absorbing part fixing assembling is in gap.
Preferably, the thickness of above-mentioned sound-absorbing part is defined as H2, and H2≤0.6H1；
Preferably, above-mentioned sound-absorbing part is fiber, PP cotton, polyester fiber, Carbon fibe or porous foam.
A kind of kitchen ventilator of multi-frequency noise interference device of the invention, is provided with smoke machine main body and for reducing multi-frequency
The noise interference device of noise, noise interference device are assemblied in smoke machine main body；Opening that there are two the noise interference device settings,
Two openings are connected to respectively from the main air duct of smoke machine main body and the horizontal position of two openings is different；It will be close to main air duct air inlet
Opening be defined as K1, K1Area be defined as M1, the opening close to main air duct air outlet is defined as K2, K2Area be defined as
M2, the area of the air inlet of main air duct is defined as K3, K3Area be defined as M3, the area of main air duct air outlet is defined as K4, K4
Area be defined as M4, and M1≤M3, M2≤M4.Area, noises of the present invention by adjusting two of noise interference device openings
The shortest distance of the entire length of interference device or two openings reaches the noise reduction of specific multi-frequency noise.The oil smoke function is protected
Long-term good noise reduction effect is held, which has the advantages that low cost, reliability are high.The noise interference device is
Through the resonance amplitude and phase of specific noise frequency, interfered with the noise transmitted in main air duct pipe to lower this noise frequency
The amplitude of rate, the noise reduction for reaching specific multi-frequency noise are reduced.The material of the noise interference device is anticorrosive, anti-ization
It learns corrosion and is hardly damaged.
Another object of the present invention is to provide a kind of noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device,
This method, which passes through, determines that the parameter of noise interference device and noise filtering device can enough determine specific basic frequency.
A kind of noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device is provided, A, the design of noise interference device:
1.1, determine noise interference device target noise reduction basic frequency fh；
1.2, pass through velocity of sound c, the length L of noise interference deviceaAnd K1And K2The relationship of shortest distance Δ L make an uproar really
Acoustic interference device basic frequency fh, basic frequency fhIt is positively correlated with c, LaWith Δ L, such as formula (I),
B, noise filtering device designs:
2.1, determine the target noise reduction frequency f of noise filtering deviceg；
2.2, by the aperture d of the second through-hole, the second through-hole edge and adjacent second through-hole edge minimum range b with
And the distance H in gap1The basic frequency f of the certain noise filtering device of relationshipk。
Preferably, the basic frequency f of above-mentioned noise interference devicehIt include f0,1And f0,2。
Preferably, the subfrequency of above-mentioned noise interference device is fs1And fs2, fs1Be expressed as formula (II), fs2Table
It states as formula (III), fs1=[3f0,1,......,if0,1,......,xf0,1], wherein ∞ >=x >=i >=2m+1, m are positive integer expression
(II),
fs2=[2f0,2,......,jf0,2,......,yf0,2], the wherein formula of ∞ >=y >=j >=2 (III).
Preferably, above-mentioned noise interference device setting C and C are the positive integer greater than 2；
The basic frequency of C noise interference device is respectively defined as f by the C noise interference device1 0,1With
f1 0,2... ..., fk 0,1And fk 0,2... ..., fC 0,1And fC 0,2, wherein C >=k >=2, and k is positive integer.
Preferably, the subfrequency of above-mentioned C noise interference device is respectively defined as f1 s1And f1 s2... ..., fk s1With
fk s2... ..., fC s1And fC S2。
Preferably, above-mentioned fgWith f0,1And f0,2Relationship such as formula (IV),
Preferably, the target basic frequency of above-mentioned noise interference device or the A weighted sound pressure level of subfrequency are not less than
Y, and Y≤80dB.
Preferably, above-mentioned formula (I) is embodied asWherein N is subfrequency multiple and N=(2p+
1)/2, p is arbitrary integer.
A kind of noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device of the invention is specifically included there are two portion
Point, it is the design of noise interference device and the design of noise filtering device respectively, passes through setting noise interference device and noise mistake respectively
The parameter of filter device can determine target noise reduction frequency.
Detailed description of the invention
Using attached drawing, the present invention is further illustrated, but the content in attached drawing is not constituted to any limit of the invention
System.
Fig. 1 is the noise interference device of embodiment 1 and the structural schematic diagram of main air duct.
Fig. 2 is the schematic cross-section of Fig. 1.
Fig. 3 is the length L of noise interference deviceaSchematic diagram.
Fig. 4 is K1And K2Shortest distance Δ L schematic diagram.
Fig. 5 is the schematic diagram of the shape of the cross section of noise interference device, 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 noise interference device of embodiment 2 and the structural schematic diagram of main air duct.
Fig. 7 is the structural schematic diagram of the noise interference device of embodiment 3, main air duct, acoustical cotton and noise filtering device.
Fig. 8 is the enlarged drawing in the region z in Fig. 7.
Fig. 9 is the structural schematic diagram of noise filtering device in Fig. 7.
Figure 10 is the edge minimum range relation schematic diagram at the edge and adjacent through-holes of through-hole aperture and through-hole in Fig. 9.
Figure 11 is first through hole by area schematic is arranged, and (B) in (A) and Figure 11 in Figure 11 is square arrangement, figure
(C) in 11 and (D) in Figure 11 is rounded projections arranged, and (F) in (E) and Figure 11 in Figure 11 is diamond array, Tu11Zhong
(G) and Figure 11 in (H) be polygonal arrangement.
Fig. 1 includes into Figure 11:
Noise interference device 1,
Main air duct 2, first through hole 21,
Noise filtering device 3, the second through-hole 31,
Sound-absorbing part 4.
Specific embodiment
Technical solution of the present invention is described further with the following Examples.
Embodiment 1.
A kind of kitchen ventilator of multi-frequency noise interference device, as shown in Fig. 1 to 5, be provided with smoke machine main body and for reducing
The noise interference device 1 of multi-frequency noise, noise interference device 1 are assemblied in smoke machine main body.
There are two opening, two openings are connected to the main air duct 2 of smoke machine main body and two the setting of noise interference device 1 respectively
The horizontal position of opening is different.
K will be defined as close to the opening of 2 air inlet of main air duct1, K1Area be defined as M1, close to 2 air outlet of main air duct
Opening is defined as K2, K2Area be defined as M2, the area of the air inlet of main air duct 2 is defined as K3, K3Area be defined as M3, main
The area of 2 air outlet of air duct is defined as K4, K4Area be defined as M4, and M1≤M3, M2≤M4。
Main air duct 2 and 1 communicating position of noise interference device are provided with first through hole 21.First through hole 21 of the invention is arranged
Have multiple.
Noise interference device 1 of the invention by adjusting two be open areas, noise interference device 1 entire length or
The shortest distance of person two openings reaches the noise reduction of specific multi-frequency noise.
The shape of first through hole 21 of the present invention is circle, ellipse, triangle, square, rectangle, pentagon, six sides
At least one of shape, diamond shape or irregular shape.The round first through hole 21 of the present embodiment is in the upper opposite appearance of technique production
Easily, and because of the interference of not no corner angle.
It should be noted that the shape of first through hole 21 may be ellipse, triangle, square, rectangle, pentagon,
Hexagon, diamond shape or irregular shape, or the combination of the shape of above-mentioned a variety of first through hole 21, specific embodiment party
Depending on formula is with actual conditions.
The length of noise interference device 1 of the invention is defined as La, and 0 < La≤ 1000mm, the L of the present embodimentaSpecially
300mm。
It should be noted that the length of noise interference device 1 of the invention can be 300mm, or be greater than 0, be less than
The random length of 1000mm, depending on specific length is with actual conditions.
K of the invention1And K2The shortest distance be defined as Δ L, and La> Δ L > 5mm, the Δ L of the present embodiment are specially
100mm。
It should be noted that K of the invention1And K2The shortest distance can be 100mm, or be greater than 5mm, be less than La
Any distance, depending on specific distance is with actual conditions.
The area of the air inlet of main air duct 2 of the invention is defined as K3, K3Area be defined as M3；The air outlet of main air duct 2
Area be defined as K4, K4Area be defined as M4.The noise reduction effect and main air duct 2 and branched pipe caliber of noise interference device 1 have
Great relationship.The present invention 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 the resonance phase that good noise reduction effect is formed in noise interference device 1
With some deviations of amplitude, with this condition, broadband noise frequency can be effectively reduced in this.
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 noise interference device 1 resonates have slight deviations that will damage to the transmitting of sound wave
Mistake has significant change.In equal cross-sectional area M3=M4Under equal proportion, the slippages of noise interference device 1 are Δ L/La
Function.
The cross section of noise interference device 1 of the invention it is conveniently of circular shape, or ellipse, rectangle, three
Angular, diamond shape or the arbitrary shape in addition to above-mentioned shape, the shape of specific cross section according to the actual situation depending on.
The cross section of noise interference device 1 of the invention is circle, as shown in (1) in Fig. 5.
The cross section of noise interference device 1 of the invention is ellipse, as shown in (2) in Fig. 5.
The cross section of noise interference device 1 of the invention is rectangle, as shown in (3) in Fig. 5.It should be noted that this hair
Rectangle in bright is not limited to this rectangle of (3) in Fig. 5, other rectangles also comply with the requirement of rectangle of the present invention, also at this
In the protection scope of invention.
The cross section of noise interference device 1 of the invention is triangle, as shown in (4) in Fig. 5.
The cross section of noise interference device 1 of the invention is diamond shape, as shown in (5) in Fig. 5.
The cross section of noise interference device 1 of the invention is arbitrary shape, such as (6) in Fig. 5, (7) in Fig. 5 and Fig. 5
In (8) shown in.It should be noted that the arbitrary shape in the present invention is not limited to (6) in Fig. 5, in (7) and Fig. 5 in Fig. 5
(8) this 3 kinds of rectangles, other arbitrary shapes also comply with the requirement of arbitrary shape of the present invention, also in protection scope of the present invention
It is interior.
The cross section of noise interference device 1 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 principle of the present invention are as follows: noise interference device 1 (Herschel-Quincke pipe) is according to the interference between sound wave
Achieve the effect that reduce sound.Noise interference device 1 be according between sound wave resonance and interference achieve the effect that reduce sound.
Because noise interference device 1 has multiple resonant frequencies: f0,1、f0,2、fs1And fs2.The broadband noise waves that kitchen ventilator generates exist
It is propagated in main air duct 2, when encountering noise interference device, broadband noise waves are divided into first via broadband noise waves and second and have a lot of social connections
Frequency noise wave, the continuation of first via broadband noise waves are propagated in main air duct 2；Second has a lot of social connections, and to enter noise dry for frequency noise wave
It relates to device 1 and resonates with noise interference device 1, and one of them from noise interference device is open out and imports 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, the second frequency of having a lot of social connections is made an uproar
Sound wave enters noise interference device 1 and resonates with noise interference device 1, and one of them from noise interference device 1 is opened
Mouth, which comes out, imports main air duct.From the first via broadband noise waves that noise interference device 1 propagates from after importing main air duct 2 with
What main air duct 2 was propagated second has a lot of social connections frequency noise wave there are phase difference, and first via broadband noise waves and the second frequency of having a lot of social connections are made an uproar
Sound wave interferes to form interference broadband noise waves, and interference broadband noise waves subtract relative to the amplitude of broadband noise waves
Weak, noise reduces
The kitchen ventilator of the multi-frequency noise interference device is provided with smoke machine main body and the noise for reducing multi-frequency noise
Interference device 1, noise interference device 1 are assemblied in smoke machine main body；There are two opening, two are opened for the setting of noise interference device 1
Mouth is connected to respectively from the main air duct 2 of smoke machine main body and the horizontal position of two openings is different；By opening close to 2 air inlet of main air duct
Mouth is defined as K1, 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, main
The area of the air inlet in air duct 2 is defined as K3, K3Area be defined as M3, the area of 2 air outlet of main air duct is defined as K4, K4Face
Product is defined as M4, and M1≤M3, M2≤M4.Area, noise interferences of the present invention by adjusting two of noise interference device 1 openings
The shortest distance of the entire length of device 1 or two openings reaches the noise reduction of specific multi-frequency noise.The kitchen ventilator is able to maintain
Long-term good noise reduction effect, the noise interference device 1 have the advantages that low cost, reliability are high.The noise interference device 1 is
Through the resonance amplitude and phase of specific noise frequency, the noise for managing interior transmitting with main air duct 2 is interfered to lower this noise
The amplitude of frequency, the noise reduction for reaching specific multi-frequency noise are reduced.The material of the noise interference device 1 be it is anticorrosive,
It resist chemical and is hardly damaged.
Embodiment 2.
A kind of kitchen ventilator of multi-frequency noise interference device, as shown in fig. 6, other features are same as Example 1, difference
It is in the noise interference device 1 of the present embodiment is provided with multiple.
Compared with Example 1, the parameter of multiple noise interference devices 1 of the present embodiment can be the same or different.
The noise interference device 1 for the parameter that difference is, the specific different f of the basic frequency of different noise interference devices 10,1And f0,2, because
This can reduce the noise of more broadband.For the noise interference device 1 with identical parameters, the drop of identical frequency can be improved
It makes an uproar effect.
Embodiment 3.
A kind of kitchen ventilator of multi-frequency noise interference device, as shown in Fig. 7 to 10, other features are same as Example 1, no
It is with place, smoke machine main body of the invention is additionally provided with noise filtering device 3, and noise filtering device 3 is assemblied in main air duct 2
Inner surface.
Noise filtering device 3 is set as being distributed with multiple for eliminating the panel of the second through-hole 31 of multi-frequency noise.
The aperture of second through-hole 31 is defined as d, and d≤30mm.The value of d is multiple.
The edge of second through-hole 31 and the edge minimum range of adjacent through-holes are b, and b is the arbitrary value greater than 0.The value of b is
It is multiple.
In the constant situation of aperture d, the value of the edge minimum range b of the edge of the second through-hole 31 and adjacent second through-hole 31
The target noise frequency of smaller elimination is bigger.In the edge of the second through-hole 31 and the edge minimum range of adjacent second through-hole 31
In the constant situation of b, the smaller target noise frequency to be eliminated of the value of aperture 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 present invention is by adjusting the aperture of different second through-holes 31 or the edge and adjacent second through-hole of the second through-hole 31
31 edge minimum range or noise filtering device 3 reaches specific unifrequency noise at a distance from smoke machine main body or multi-frequency is made an uproar
The noise reduction of sound.
There are gaps between the inner surface of noise filtering device 3 and main air duct 2 of the invention, are by the distance definition in gap
H1.Smoke machine main body is additionally provided with sound-absorbing part 4, and 4 fixing assembling of sound-absorbing part is in gap.The thickness of sound-absorbing part 4 is defined as H2, and H2≤
0.6H1.Sound-absorbing part 4 is fiber, PP cotton, polyester fiber, Carbon fibe or porous foam.
Denoising device principle of the invention: noise filtering device 3 can be propagated in limited closed space in noise source
When to noise filtering device 3, noise reduction is carried out.Sound wave is usually propagated with opposite direction touching noise filtering device 3, so big portion
The incidence wave divided can be interfered with back wave.In the fixed distance of the characteristic about a quarter of noise source wavelength away from being at degree
H1, the speed of particle reaches highest, because the present invention passes through noise filtering device 3 at a distance from the inner wall of smoke machine main body in noise
The a quarter of source wavelength away from degree at, the noise of the wavelength can be effectively eliminated.
The density and material of sound-absorbing part 4 also have an important influence, sound wave can directly through the sound-absorbing part 4 of extremely-low density,
The frictional wear of sound energy can not be increased；Under high density, noise sound wave then can be reflected away directly, can not enter noise mistake
Filter the second through-hole 31 of device 3.Therefore sound-absorbing part 4 of the invention is preferably fiber, PP cotton, polyester fiber, Carbon fibe or more
Hole foam.
The determinant of the resonant frequency of noise filtering device 3 of the invention: the aperture of the second through-hole 31, the second through-hole 31
Edge and adjacent second through-hole 31 edge minimum range or noise filtering device 3 and smoke machine main body at a distance from it is second logical
Whether hole 31 is independent space inside noise filtering device 3, just can determine that the resonant frequency of noise filtering device 3, reaches
Reduce the purpose of specific frequency.
The present embodiment increases noise filtering device 3 and sound-absorbing part 4 compared with embodiment, and main purpose is target noise frequency to be allowed
The energy of rate can be filtered or be absorbed by noise filtering device 3 and sound-absorbing part 4 before not entering noise interference device 1 also, remaining
Noise penetrate again noise interference device 1 elimination, to reach maximum noise reduction effect.
Embodiment 4.
A kind of kitchen ventilator of multi-frequency noise interference device, as shown in figure 11, other features are same as Example 1, different
Place is that first through hole 21 of the invention is distributed in main air duct 2 and 1 communicating position of noise interference device by arrangement region.
Arrangement region is that rounded projections arranged, square arrangement, diamond array or the polygon arranged in addition to above-mentioned three kinds are arranged
At least one of column.
Arrangement region of the invention is rounded projections arranged, square arrangement, diamond array or in addition to above-mentioned three kinds arrange
Polygonal arrangement.The arrangement region of specific the present embodiment is rounded projections arranged.
The rounded projections arranged of the present embodiment, as shown in Fig. 2.It should be noted that the rounded projections arranged in the present invention is not
It is confined in Figure 11 in C, Figure 11 and shown in Fig. 2, the arrangement region of any other rounded projections arranged also meets intermediate cam of the present invention
The requirement of shape arrangement, also within the scope of the present invention.
It should be noted that square arrangement of the invention is not limited in Figure 11 in A and Figure 11 shown in B, it is any other rectangular
The arrangement region of arrangement also meets the requirement of square arrangement in the present invention, also within the scope of the present invention.
It should be noted that diamond array of the invention is not limited in Figure 11 in E and Figure 11 shown in F, any other diamond shape
The arrangement region of arrangement also meets the requirement of diamond array in the present invention, also within the scope of the present invention.
It should be noted that polygonal arrangement of the invention is not limited in Figure 11 in G and Figure 11 shown in H, it is any other more
The arrangement region of side shape arrangement also meets the requirement of polygonal arrangement in the present invention, also within the scope of the present invention.
It should be noted that arrangement region of the invention can for rounded projections arranged, square arrangement, diamond array or in addition to
One of form of the polygonal arrangement of above-mentioned three kinds of arrangements, or the multiple groups of these four forms are closed, specific real
Depending on applying mode according to the actual situation.
The first through hole 21 of the present embodiment is distributed in main air duct 2 and 1 communicating position of noise interference device, energy by arrangement region
Enough increase the diversity of first through hole 21.
Embodiment 5.
A kind of noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device,
A, noise interference device 1 designs:
1.1, determine 1 target noise reduction basic frequency f of noise interference deviceh；
1.2, pass through velocity of sound c, the length L of noise interference device 1aAnd K1And K2The relationship of shortest distance Δ L make an uproar really
1 basic frequency f of acoustic interference deviceh, basic frequency fhIt is positively correlated with c, LaWith Δ L, such as formula (I),
B, noise filtering device 3 designs:
2.1, determine the target noise reduction frequency f of noise filtering device 3g；
2.2, it is minimum by the edge of the aperture d of the second through-hole 31, the edge of the second through-hole 31 and adjacent second through-hole 31
The distance b and distance H in gap1The basic frequency f of the certain noise filtering device 3 of relationshipk。
The basic frequency f of noise interference device 1hIt include f0,1And f0,2。
The subfrequency of noise interference device 1 is fs1And fs2, fs1Be expressed as formula (II), fs2Be expressed as formula (III),
fs1=[3f0,1,......,if0,1,......,xf0,1], wherein ∞ >=x >=i >=2m+1, m are positive integer expression
(II),
fs2=[2f0,2,......,jf0,2,......,yf0,2], the wherein formula of ∞ >=y >=j >=2 (III).
Noise interference device 1 is arranged C and C as the positive integer greater than 2.
The basic frequency of C noise interference device 1 is respectively defined as f by C noise interference device 11 0,1And f1 0,2... ...,
fk 0,1And fk 0,2... ..., fC 0,1And fC 0,2, wherein C >=k >=2, and k is positive integer.
The subfrequency of C noise interference device 1 is respectively defined as f1 s1And f1 s2... ..., fk s1And fk s2... ..., fC s1
And fC S2。
fgWith f0,1And f0,2Relationship such as formula (IV),
The target basic frequency of noise interference device 1 or the A weighted sound pressure level of subfrequency are not less than Y, and Y≤
80dB。
Wherein formula (I) is embodied asWherein N is subfrequency multiple and N=(2p+1)/2, p
For arbitrary integer.
A kind of noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device specifically includes there are two part, distinguishes
It is that the design of noise interference device 1 and noise filtering device 3 design, passes through setting noise interference device 1 and noise filtering dress respectively
The parameter for setting 3 can determine target noise reduction frequency.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention
The limitation of range, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should be managed
Solution, can be with modifying or equivalently replacing the technical solution of the present invention, without departing from the essence and model of technical solution of the present invention
It encloses.
Claims (18)
1. a kind of kitchen ventilator of multi-frequency noise interference device, it is characterised in that: it is provided with smoke machine main body and for reducing multifrequency
The noise interference device of rate noise, noise interference device are assemblied in smoke machine main body；
There are two openings for the noise interference device setting, and two openings are connected to respectively with the main air duct of smoke machine main body and two are opened
The horizontal position of mouth 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, the area of the air inlet of main air duct is defined as K3, K3Area be defined as M3, main air duct goes out
The area in air port is defined as K4, K4Area be defined as M4, and M1≤M3, M2≤M4；
The main air duct and noise interference device communicating position are provided with first through hole.
2. the kitchen ventilator of multi-frequency noise interference device according to claim 1, it is characterised in that: the first through hole is set
It is equipped with multiple.
3. the kitchen ventilator of multi-frequency noise interference device according to claim 2, it is characterised in that: the noise interference dress
The shortest distance set by adjusting two areas being open, the entire length of noise interference device or two openings reaches specific
The noise reduction of multi-frequency noise.
4. the kitchen ventilator of multi-frequency noise interference device according to claim 3, it is characterised in that: the first through hole
Shape be circle, in ellipse, triangle, square, rectangle, pentagon, hexagon, diamond shape or irregular shape extremely
Few one kind.
5. the kitchen ventilator of multi-frequency noise interference device according to claim 4, it is characterised in that: the first through hole is pressed
Arrangement region is distributed in main air duct and noise interference device communicating position；
The arrangement region is that rounded projections arranged, square arrangement, diamond array or the polygon arranged in addition to above-mentioned three kinds are arranged
At least one of column.
6. the kitchen ventilator of multi-frequency noise interference device according to claim 5, it is characterised in that: the noise interference dress
The length set is defined as La, and 0 < La≤1000mm；
The K1And K2The shortest distance be defined as Δ L, and La> Δ L > 5mm；
The M1=M2, M3=M4。
7. the kitchen ventilator of multi-frequency noise interference device according to claim 6, it is characterised in that: the noise interference dress
The shape for the cross section set is circle, ellipse, rectangle, triangle, diamond shape or the arbitrary shape in addition to above-mentioned shape.
8. according to the kitchen ventilator of multi-frequency noise interference device described in claim 2 to 7 any one, it is characterised in that: institute
State noise interference device be provided with it is multiple.
9. the kitchen ventilator of multi-frequency noise interference device according to claim 8, it is characterised in that: the smoke machine main body is also
It is provided with noise filtering device, 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 second through-hole of multi-frequency noise；
The aperture of second through-hole is defined as d, and d≤30mm；
The edge minimum range of the edge of second through-hole and adjacent second through-hole is 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 logical by adjusting the aperture of different second through-holes or the edge of the second through-hole and adjacent second
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.
10. the kitchen ventilator of multi-frequency noise interference device according to claim 9, it is characterised in that: the noise filtering
There are gaps between device and the inner surface of main air duct, are H by the distance definition in gap1；
The smoke machine main body is additionally provided with sound-absorbing part, and sound-absorbing part fixing assembling is in gap；
The thickness of the sound-absorbing part is defined as H2, and H2≤0.6H1；
The sound-absorbing part is fiber, PP cotton, polyester fiber, Carbon fibe or porous foam.
11. a kind of noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device, it is characterised in that:
A, noise interference device designs:
1.1, determine noise interference device target noise reduction basic frequency fh；
1.2, pass through velocity of sound c, the length L of noise interference deviceaAnd K1And K2Shortest distance Δ L the certain noise of relationship it is dry
Relate to device basic frequency fh, basic frequency fhIt is positively correlated with c, LaWith Δ L, such as formula (I),
B, noise filtering device designs:
2.1, determine the target noise reduction frequency f of noise filtering deviceg；
2.2, by the aperture d of the second through-hole, the edge of the second through-hole and adjacent second through-hole edge minimum range b and
The distance H of gap1The basic frequency f of the certain noise filtering device of relationshipk。
12. according to right to weigh 11 described in multi-frequency noise interference device kitchen ventilator noise-reducing design method, feature exists
In: the basic frequency f of the noise interference devicehIt include f0,1And f0,2。
13. the noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device according to claim 12, feature exist
In: the subfrequency of the noise interference device is fs1And fs2, fs1Be expressed as formula (II), fs2Be expressed as formula (III),
fs1=[3f0,1,......,if0,1,......,xf0,1], wherein ∞ >=x >=i >=2m+1, m are positive integer expression (II), fs2=
[2f0,2,......,jf0,2,......,yf0,2], the wherein formula of ∞ >=y >=j >=2 (III).
14. the noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device according to claim 13, feature exist
In: the noise interference device setting C is a and C is the positive integer greater than 2；
The basic frequency of C noise interference device is respectively defined as f by the C noise interference device1 0,1And f1 0,2... ...,
fk 0,1And fk 0,2... ..., fC 0,1And fC 0,2, wherein C >=k >=2, and k is positive integer.
15. the noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device according to claim 14, feature exist
In: the subfrequency of the C noise interference device is respectively defined as f1 s1And f1 s2... ..., fk s1And fk s2... ..., fC s1With
fC S2。
16. the noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device according to claim 15, feature exist
In: the fgWith f0,1And f0,2Relationship such as formula (IV),
17. the noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device according to claim 16, feature exist
In: the target basic frequency of the noise interference device or the A weighted sound pressure level of subfrequency are not less than Y, and Y≤80dB.
18. the noise-reducing design method of the kitchen ventilator of multi-frequency noise interference device according to claim 17, feature exist
In: the formula (I) is embodied asWherein N is subfrequency multiple and N=(2p+1)/2, p is to appoint
Meaning integer.
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| CN1280241A (en) * | 1999-07-07 | 2001-01-17 | 韩国科学技术研究院 | Method and device for controlling noise of exhaust gas |
| US20040045767A1 (en) * | 2000-10-02 | 2004-03-11 | Stuart Byrne | Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive herschel-quincke tubes |
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Application publication date: 20190222 |