CN108954432A - A kind of kitchen ventilator having multi-frequency noise filtering device - Google Patents
A kind of kitchen ventilator having multi-frequency noise filtering device Download PDFInfo
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- CN108954432A CN108954432A CN201810772829.1A CN201810772829A CN108954432A CN 108954432 A CN108954432 A CN 108954432A CN 201810772829 A CN201810772829 A CN 201810772829A CN 108954432 A CN108954432 A CN 108954432A
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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
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- General Engineering & Computer Science (AREA)
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
A kind of kitchen ventilator having multi-frequency noise filtering device, is provided with smoke machine main body and noise filtering device, the noise filtering device that can eliminate multi-frequency noise is assemblied in smoke machine main body.Denoising device in the prior art can only be directed to single target frequency noise reduction.A kind of kitchen ventilator of tool multi-frequency noise filtering device of the invention can be distributed by adjusting the apertures of different through-holes, the edge of through-hole and edge minimum range, the via regions of panel of adjacent through-holes or noise filtering device and smoke machine main body at a distance from reach multi-frequency noise noise reduction.The noise filtering device is able to maintain long-term good noise reduction effect, which, which has, is easy to arrange, and dust, the grease on surface etc. can remove cleaning.The noise filtering device has the advantages that low cost, reliability are high.The material of the noise filtering device is anticorrosive, chemical resistance and is hardly damaged.It can be effectively reduced narrow frequency noise and broadband noise, noise reduction wide frequency range can reduce the noise of multiple frequencies.
Description
Technical field
The present invention relates to kitchen ventilator field, in particular to a kind of kitchen ventilator for having multi-frequency noise filtering device.
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.And the passive denoising device of the prior art can only be handled for the noise of single-frequency section, it cannot be right
The noise of multiband carries out noise reduction.Since the noisy frequency range that kitchen ventilator generates can be 100Hz~8000Hz, it is clear that existing
In technology good noise reduction effect can not be generated for kitchen ventilator for the passive denoising device of single-frequency section.
Therefore, in view of the shortcomings of the prior art, the kitchen ventilator for providing a kind of tool multi-frequency noise filtering device is existing to solve
Technical deficiency is very necessary.
Summary of the invention
A kind of tool multi-frequency noise filtering device is provided it is an object of the invention to avoid the deficiencies in the prior art place
Kitchen ventilator.The kitchen ventilator of the tool multi-frequency noise filtering device has the advantages that multi-frequency noise can be eliminated.
Above-mentioned purpose of the invention is realized by following technical measures:
A kind of kitchen ventilator having multi-frequency noise filtering device is provided, smoke machine main body is provided with and multi-frequency can be eliminated and make an uproar
The noise filtering device of sound.
The smoke machine main body is provided with internal air duct, and internal air duct is set to the inside of smoke machine main body, noise filtering device
It is assemblied in internal air duct；Or
The smoke machine main body is provided with internal air duct and bellows, and internal air duct is set to the inside of smoke machine main body, bellows dress
Assigned in internal air duct, noise filtering device is assemblied in bellows inner wall.
The noise filtering device is set as being distributed with multiple for eliminating the panel of the through-hole of multi-frequency noise.
The present invention is by adjusting the edge minimum range in the aperture of different through-holes, the edge of through-hole and adjacent through-holes, panel
Via regions distribution or noise filtering device reach multi-frequency noise noise reduction at a distance from smoke machine main body.
Preferably, the aperture of above-mentioned through-hole is defined as d, and d≤30mm.
Preferably, the value of above-mentioned d is multiple.
Preferably, the minimum range between the edge of above-mentioned through-hole and the edge of adjacent through-holes is b, and b is any greater than 0
Value.
Preferably, the value of above-mentioned b is multiple.
Preferably, there are gaps between above-mentioned panel and smoke machine main body, are H by the distance definition in gap1。
Preferably, above-mentioned noise filtering device is additionally provided with sound-absorbing part, and sound-absorbing part assembles smoke machine main body.
Preferably, the thickness of above-mentioned sound-absorbing part is defined as H2, and H2≤0.6H1。
Preferably, above-mentioned sound-absorbing part is fixed on gap.
Preferably, above-mentioned sound-absorbing part is fiber, PP cotton, polyester fiber, Carbon fibe or porous foam；Or
The sound-absorbing part is porous plate.
Preferably, above-mentioned panel is provided with multiple regions, and multiple through-holes are by area distribution in corresponding positions of panels.
The region is bilateral symmetry formula region, formula region symmetrical above and below or asymmetric formula region；Or
The region is divergence expression region, spiral region, wave region, winding type region or removes above-mentioned zone
Random mode region.
Preferably, above-mentioned panel is metal decking, plastic front board or alloy panel；
Preferably, above-mentioned panel is connected with reinforced structure；
Preferably, above-mentioned reinforced structure is convex closure, recessed packet or reinforcing rib.
Preferably, the thickness of above-mentioned panel is less than 20mm.
Preferably, it is 100Hz~8000Hz that above-mentioned noise filtering device, which eliminates noisy frequency range,.
A kind of kitchen ventilator of tool multi-frequency noise filtering device of the invention is provided with smoke machine main body and can eliminate multifrequency
The noise filtering device of rate noise.The smoke machine main body is provided with internal air duct, and internal air duct is set to the inside of smoke machine main body,
Noise filtering device is assemblied in internal air duct；Or the smoke machine main body is provided with internal air duct and bellows, internal air duct setting
In the inside of smoke machine main body, bellows are assemblied in internal air duct, and noise filtering device is assemblied in bellows inner wall.The noise filtering
Device is set as being distributed with multiple for eliminating the panel of the through-hole of multi-frequency noise.Denoising device in the prior art, can only
For single target frequency noise reduction.A kind of kitchen ventilator of tool multi-frequency noise filtering device of the invention can be by adjusting not
With the edge minimum range in the aperture of through-hole, the edge of through-hole and adjacent through-holes, the distribution of the via regions of panel or noise mistake
Filter device reaches multi-frequency noise noise reduction at a distance from smoke machine main body.The noise filtering device is able to maintain long-term good noise reduction effect
Fruit, which, which has, is easy to arrange, and dust, the grease on surface etc. can remove cleaning.Noise filtering device tool
Have the advantages that low cost, reliability are high.The material of the noise filtering device is anticorrosive, chemical resistance and non-damageable excellent
Point, while can be effectively reduced narrow frequency noise and broadband noise.
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 a kind of range hood structure schematic diagram of tool multi-frequency noise filtering device of embodiment 1.
Fig. 2 is the aperture schematic diagram of the through-hole of panel in Fig. 1.
Fig. 3 is the edge minimum range schematic diagram at the edge of the through-hole of panel and adjacent through-holes in Fig. 1.
Fig. 4 is a kind of kitchen ventilator perspective view of tool multi-frequency noise filtering device of embodiment 2.
Fig. 5 is bottom view in Fig. 4.
Fig. 6 is panel construction schematic diagram in Fig. 4.
Fig. 7 is the panel construction schematic diagram of embodiment 3.
Fig. 8 is through-hole different zones distribution mode, and the B in A and Fig. 8 in Fig. 8 is bilateral symmetry formula region, the C in Fig. 8
It is formula region symmetrical above and below with the D in Fig. 8, the F in E and Fig. 8 in Fig. 8 is asymmetric formula region.
Fig. 9 is the panel construction schematic diagram of the embodiment of the present invention 4.
Figure 10 is through-hole different zones distribution mode, and the B in A and Figure 10 in Figure 10 is divergence expression region, the C in Figure 10
It is spiral region with the D in Figure 10, the F in E and Figure 10 in Figure 10 is wave region, the H in G and Figure 10 in Figure 10
For winding type region, the J in I and Figure 10 in Figure 10 is random mode region.
Figure 11 is the panel construction schematic diagram of the embodiment of the present invention 5.
Fig. 1 includes into Figure 11:
Noise filtering device 1,
Panel 11, through-hole 111, reinforced structure 112,
Sound-absorbing part 12,
Internal air duct 21, bellows 22.
Specific embodiment
Technical solution of the present invention is described further with the following Examples.
Embodiment 1.
A kind of kitchen ventilator having multi-frequency noise filtering device, as shown in Figure 1-3, be provided with smoke machine main body and can eliminate
The noise filtering device 1 of multi-frequency noise.
Smoke machine main body is provided with internal air duct 21, and internal air duct 21 is set to the inside of smoke machine main body, noise filtering device 1
It is assemblied in internal air duct 21.
Noise filtering device 1 is set as being distributed with multiple for eliminating the panel 11 of the through-hole 111 of multi-frequency noise.
The present invention is minimum by adjusting the edge in the aperture of different through-holes 111, the edge of through-hole 111 and adjacent through-holes 111
Distance, 111 area distribution of through-hole of panel 11 or noise filtering device 1 reach multi-frequency noise at a distance from smoke machine main body 2
The purpose of noise reduction.
The aperture of through-hole 111 of the invention is defined as d, and d≤30mm；Wherein the value of d is multiple.Through-hole of the invention
111 edge and the edge minimum range of adjacent through-holes 111 are b, and b is the arbitrary value greater than 0, and wherein the value of b is multiple.
In the constant situation of aperture d, the value of the edge minimum range b at the edge and adjacent through-holes 111 of through-hole 111 is smaller to disappear
The target noise frequency removed is bigger.Under the edge of through-hole 111 and the constant situation of edge minimum range b of adjacent through-holes 111,
The smaller target noise frequency to be eliminated of the value of aperture d is with regard to smaller.
There are gaps between panel 11 and smoke machine main body of the invention, are H by the distance definition in gap1.The present embodiment tool
Body is that there are gaps between panel 11 and internal air duct 21.
Noise filtering device 1 is additionally provided with sound-absorbing part 12, and sound-absorbing part assembles smoke machine main body.The thickness of sound-absorbing part 12 is defined as
H2, and H2≤0.6H1.Sound-absorbing part 12 is fixed on gap, and specifically sound-absorbing part 12 is fixed on the outer surface of noise filtering device 1.
The density and material of sound-absorbing part 12 have important influence, and sound wave can not have directly through the sound-absorbing part of extremely-low density
The frictional wear of method increase sound energy.Under high density, noise sound wave then can be reflected away directly, can not enter noise filtering
The hole of device 1.Therefore sound-absorbing part 12 of the invention is preferably fiber, PP cotton, polyester fiber, Carbon fibe or porous foam.Or
Person's sound-absorbing part 12 is porous plate.
The setting of the present embodiment sound-absorbing part 12 can increase the consume of friction, enhance noise reduction effect.
Denoising device principle of the invention is such that noise filtering device 1 can make an uproar in limited closed space
When sound source travels to noise filtering device 1, noise reduction is carried out.Sound wave is usually propagated with opposite direction touching noise filtering device 1,
So most incidence wave can be interfered with back wave.In specific distance, about a quarter of noise source wavelength away from
At degree, the speed of particle reaches highest.Because the present invention passes through noise filter i.e. H at a distance from smoke machine main body1, in noise source wave
Long a quarter away from degree at, the noise of the wavelength can be effectively eliminated.
Noise filtering device 1 is to carry out noise reduction using the principle of resonance, in space specific noise frequency be already provided with
The noise filtering device 1 of target frequency forms covibration.
When resonate occur when, the sound wave of oscillation can intensely pierce into out through-hole 111 back and forth in air, and the sound of noise can be
It is converted to friction loss during this, achievees the effect that eliminate target frequency noise.
A kind of kitchen ventilator of tool multi-frequency noise filtering device of the invention can be by adjusting the aperture of different through-holes 111
With the edge of through-hole 111 and edge minimum range, 111 area distribution of through-hole of panel 11 or the noise mistake of adjacent through-holes 111
Filter device 1 achievees the purpose that the noise for reducing different target frequency at a distance from smoke machine main body 2.The present invention can pass through letter
Division, arrangement and the arrangement in single 11 through-hole of panel, 111 region can achieve wideband frequency noise reduction purpose.
The noise filtering device 1 is easy to arrange, while the dust on 1 surface of noise filtering device, grease can be by removing
It removes.The noise filtering device 1 has the advantages that low cost and reliability are high.The material of the noise filtering device 1 is anticorrosive
And the advantages of chemical resistance, it is hardly damaged.The noise filtering device 1 can be effectively reduced narrow frequency noise and broadband noise, noise reduction
Frequency range is big, while can reduce the noise of multiple frequencies.
Embodiment 2.
A kind of kitchen ventilator having multi-frequency noise filtering device, as Figure 4-Figure 6, other characteristics are same as Example 1, no
Be with place: smoke machine main body is provided with internal air duct 21 and bellows 22, and internal air duct 21 is set to the inside of smoke machine main body, wind
Case 22 is assemblied in internal air duct 21, and noise filtering device 1 is assemblied in 22 inner wall of bellows.
There are gaps between panel 11 and smoke machine main body of the invention, are H by the distance definition in gap1.The present embodiment tool
There are gaps between 22 inner wall of panel 11 and bellows for body.
Compared with Example 1, embodiment adds bellows 22, and a limited envelope can be re-formed in internal air duct 21
The space closed is more advantageous to the reduction of multi-frequency noise.
Embodiment 3.
A kind of kitchen ventilator having multi-frequency noise filtering device, as shown in fig. 7, other features are same as Example 1, it is different
Place is that panel 11 of the present invention is provided with multiple regions, and multiple through-holes 111 are by area distribution in corresponding 11 position of panel.
Region of the invention can be divided into bilateral symmetry formula region, formula region symmetrical above and below or asymmetric formula region.Specifically, this reality
The through-hole 111 of a panel 11 is applied by the area B in a-quadrant, formula region symmetrical above and below such as Fig. 7 in bilateral symmetry formula region such as Fig. 7
The various forms of area distributions in three kinds of the region C and D in domain and asymmetric formula region such as Fig. 7 are in panel 11.
The bilateral symmetry formula region of the present embodiment, as shown in the A in Fig. 7.It should be noted that the bilateral symmetry in the present invention
Formula region is not limited to the region that the B in the A or Fig. 8 in A, Fig. 8 in Fig. 7 is these three bilateral symmetry formula modes, other
The region of any bilateral symmetry formula mode also meets the requirement in bilateral symmetry formula region in the present invention, also in protection model of the invention
In enclosing.
The formula region symmetrical above and below of the present embodiment, as shown in the B in Fig. 7.It should be noted that symmetrical above and below in the present invention
Formula region is not limited to these three the formula mode symmetrical above and below regions the D in the C or Fig. 8 in B, Fig. 8 in Fig. 7, any other
The region of formula mode symmetrical above and below also meets the requirement in present invention formula region symmetrical above and below, also within the scope of the present invention.
The asymmetric formula region of the present embodiment, as shown in the D in the C and Fig. 7 in Fig. 7.It should be noted that in the present invention
Asymmetric formula region is not limited to these four asymmetric formula sides of the E in D, Fig. 8 in C, Fig. 7 in Fig. 7 or F in Fig. 8
The region of formula, the region of any other asymmetry formula mode also meets the requirement in asymmetric formula region of the invention, also in the present invention
Protection scope in.
It should be noted that the through-hole 111 of panel 11 of the invention is not limited to the left and right as shown in Figure 7 of the present embodiment
The distribution mode in symmetrical region, formula region symmetrical above and below and asymmetric formula region, or bilateral symmetry formula region, up and down
The multiple arrangements of any one in symmetrical region or asymmetric formula region, can also a more than two kinds of regions row
Column, or multiple arrangements more than two kinds of regions, depending on specific performance is with actual conditions.
The through-hole 111 of the panel 11 of the present embodiment is to be conducive to be configured institute by region by the effect that multiple regions are distributed
The frequency for the target noise for needing to eliminate.
Embodiment 4.
A kind of kitchen ventilator having multi-frequency noise filtering device, as shown in figure 9, other features are same as Example 1, it is different
Place is, the region of the present embodiment can be divided into divergence expression region, spiral region, wave region, winding type region or
The random mode region of person's removing above-mentioned zone.
The region of the present embodiment can be divided into two spiral regions, a divergence expression region and a random mode region.
Specifically, the B area in A and Fig. 9 in the spiral region of through-hole 111 of the present embodiment panel 11 such as Fig. 9, divergence expression region is such as
Tri- kinds of various forms of area distributions of C in the region D and random mode region such as Fig. 9 in Fig. 9 are in panel 11.
The divergence expression region of the present embodiment, as shown in the D in Fig. 9.It should be noted that the divergence expression region in the present invention is not
It is confined to these three divergence expression regions of the B in the A or Figure 10 in D, Figure 10 in Fig. 9, any other divergence expression mode area
Domain also complies with the requirement in divergence expression region of the present invention, also within the scope of the present invention.
The spiral region of the present embodiment, as shown in the B in the A and Fig. 9 in Fig. 9, it should be noted that, the spiral shell in the present invention
Rotating region is not limited to these four spiral regions of the C in B, Figure 10 in A, Fig. 9 in Fig. 9 or D in Figure 10,
He also complies with requirement of the invention in any spiraling manner region, also within the scope of the present invention.
The random mode region of the present embodiment, as shown in the C in Fig. 9, the random mode region in the present invention is not limited in Fig. 9
C, Figure 10 in I or Figure 10 in J these three random mode regions, any other random mode mode region also complies with this hair
Bright requirement, also within the scope of the present invention.
Wave region in the present invention is not limited to both wave regions of the F in the E and Figure 10 in Figure 10,
He also complies with requirement of the invention in any wave mode region, also within the scope of the present invention.
Winding type region in the present invention is not limited to both winding type modes of the H in the G and Figure 10 in Figure 10,
He also complies with requirement of the invention in any winding type mode region, also within the scope of the present invention.
It should be noted that the through-hole 111 of panel 11 of the invention is not limited to the diverging as shown in Figure 9 of the present embodiment
The distribution mode in formula region, random mode region and spiral region, or divergence expression region, spiral region, wave
The multiple arrangements of any one in the random mode region in region, winding type region or removing above-mentioned zone, can also be two kinds
A more than region arrangement, or multiple arrangement specific embodiments more than two kinds of regions can be according to practical feelings
Depending on condition.
Embodiment 5.
A kind of kitchen ventilator having multi-frequency noise filtering device, as shown in figure 11, other features are same as Example 1, no
It is with place, the panel 11 of the present embodiment is specially metal decking 11.Noise filtering device 1 eliminates noisy frequency range
100Hz~8000Hz.
It should be noted that panel 11 of the invention or plastic front board 11 or alloy panel 11, specific embodiment party
Depending on formula is with actual conditions.
The thickness of panel 11 of the invention is less than 20mm, because of the blocked up weight that will increase noise filtering device 1.
The panel 11 of the present embodiment is connected with reinforced structure 112.Specific reinforced structure 112 is reinforcing rib.
It should be noted that the one of which of reinforced structure 112 of the invention or reinforcing rib, convex closure or recessed packet,
It may be a variety of any combination, depending on specific embodiment is with actual conditions.
Compared with Example 1, the more rigid of panel 11 is low resistance structure to the present embodiment.Low resistance structure can make into
Ejected wave and back wave have out of phase under the specific distance with reflecting surface, so that the sound wave of noise can cancel out each other, from
And reduce the intensity of noise.The panel 11 of the metal of the present embodiment has the advantages that high temperature resistant, durable.
Embodiment 7.
A kind of design for the kitchen ventilator having multi-frequency noise filtering device:
Target frequency 1:7000Hz.
The aperture d=10mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=2.6mm.
Target frequency 2:800Hz.
The aperture d=5mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=20mm.
Therefore the noise filtering device 1 of the kitchen ventilator is only in the spy with the corresponding through-hole 111 of above-mentioned two target frequency
Property can effectively eliminate the noise of corresponding frequency.
It should be noted that the present embodiment only lists the design parameter of two target frequencies, table can not only for the present invention
For the noise of two kinds of frequencies, only corresponding different parameter, the present invention can eliminate the noise of multi-frequency, reach wideband frequency drop
It makes an uproar purpose.
Embodiment 8.
A kind of design for the kitchen ventilator having multi-frequency noise filtering device:
Target frequency 1:8000Hz.
The aperture d=10mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=2.5mm.
Target frequency 2:100Hz.
The aperture d=2mm of through-hole 111, the edge of through-hole 111 and the edge minimum range b=23mm of adjacent through-holes 111,
H1=50mm.
Therefore the noise filtering device 1 of the kitchen ventilator is only in the spy with the corresponding through-hole 111 of above-mentioned two target frequency
Property can effectively eliminate the noise of corresponding frequency.
It should be noted that the present embodiment only lists the design parameter of two target frequencies, table can not only for the present invention
For the noise of two kinds of frequencies, only corresponding different parameter, the present invention can eliminate the noise of multi-frequency, reach wideband frequency drop
It makes an uproar purpose.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than 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 (10)
1. a kind of kitchen ventilator for having multi-frequency noise filtering device, it is characterised in that: it is provided with smoke machine main body and can eliminate more
The noise filtering device of frequency noise；
The smoke machine main body is provided with internal air duct, and internal air duct is set to the inside of smoke machine main body, the assembly of noise filtering device
In internal air duct；Or
The smoke machine main body is provided with internal air duct and bellows, and internal air duct is set to the inside of smoke machine main body, and bellows are assemblied in
In internal air duct, noise filtering device is assemblied in bellows inner wall；
The noise filtering device is set as being distributed with multiple for eliminating the panel of the through-hole of multi-frequency noise.
2. the kitchen ventilator of tool multi-frequency noise filtering device according to claim 1, it is characterised in that: by adjusting difference
Edge minimum range, the distribution of the via regions of panel or the noise filtering in the aperture of through-hole, the edge of through-hole and adjacent through-holes
Device reaches multi-frequency noise noise reduction at a distance from smoke machine main body.
3. the kitchen ventilator of tool multi-frequency noise filtering device according to claim 2, it is characterised in that: the hole of the through-hole
Diameter is defined as d, and d≤30mm；
The value of the d is multiple.
4. the kitchen ventilator of tool multi-frequency noise filtering device according to claim 3, it is characterised in that: the side of the through-hole
Minimum range between edge and the edge of adjacent through-holes is b, and b is the arbitrary value greater than 0；
The value of the b is multiple.
5. the kitchen ventilator of tool multi-frequency noise filtering device according to claim 4, it is characterised in that: the panel and cigarette
There are gaps between owner's body, are H by the distance definition in gap1。
6. the kitchen ventilator of tool multi-frequency noise filtering device according to claim 5, it is characterised in that: the noise filtering
Device is additionally provided with sound-absorbing part, and sound-absorbing part assembles smoke machine main body；
The thickness of the sound-absorbing part is defined as H2, and H2≤0.6H1。
7. the kitchen ventilator of tool multi-frequency noise filtering device according to claim 6, it is characterised in that: the sound-absorbing part is solid
Due to gap；
The sound-absorbing part is fiber, PP cotton, polyester fiber, Carbon fibe or porous foam；Or
The sound-absorbing part is porous plate.
8. the kitchen ventilator of tool multi-frequency noise filtering device according to claim 7, it is characterised in that: the panel setting
There are multiple regions, multiple through-holes are by area distribution in corresponding positions of panels；
The region is bilateral symmetry formula region, formula region symmetrical above and below or asymmetric formula region；Or
The region be divergence expression region, spiral region, wave region, winding type region or remove above-mentioned zone with
Machine formula region.
9. the kitchen ventilator of tool multi-frequency noise filtering device according to claim 8, it is characterised in that: the panel is gold
Belong to panel, plastic front board or alloy panel；
The panel is connected with reinforced structure；
The reinforced structure is convex closure, recessed packet or reinforcing rib.
10. the kitchen ventilator of tool multi-frequency noise filtering device according to claim 9, it is characterised in that: the panel
Thickness is less than 20mm；
It is 100Hz~8000Hz that the noise filtering device, which eliminates noisy frequency range,.
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Application publication date: 20181207 |