CN107882777A - A kind of suppression noise structure for blower fan - Google Patents
A kind of suppression noise structure for blower fan Download PDFInfo
- Publication number
- CN107882777A CN107882777A CN201711173550.3A CN201711173550A CN107882777A CN 107882777 A CN107882777 A CN 107882777A CN 201711173550 A CN201711173550 A CN 201711173550A CN 107882777 A CN107882777 A CN 107882777A
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- CN
- China
- Prior art keywords
- noise
- blower fan
- silencing cavity
- vane face
- noise structure
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/665—Sound attenuation by means of resonance chambers or interference
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of suppression noise structure for blower fan, belong to Fan Equipment technical field.The blower fan noise-reducing structure of prior art, same cavity is shared below its porous plate, causes resonance bands narrow, single-frequency noise can only be absorbed, noise reduction frequency band is narrow, and noise reduction is poor, and noise is big when causing blower fan work, poor user experience.Two layers of ring wall inside and outside the pedestal lower end face setting of the present invention, the first silencing cavity is formed between two layers of ring wall, internal ring wall lower surface opens up tiny groove, the ring wall of the support is contacted in the on reducing housing first flat portion, noise enters in the first silencing cavity from tiny groove, absorbed noise is in the first silencing cavity impact several times, reduction noise.The present invention sets the first silencing cavity, and for absorbing noise, manufacturing process is simple, manufacturing cost is low, while can absorb multi-frequency noise, noise reduction bandwidth, excellent noise reduction effect.
Description
Technical field
The present invention relates to a kind of suppression noise structure for blower fan, belong to Fan Equipment technical field.
Background technology
The suppression noise structure for blower fan of prior art, is usually taken Helmholz resonance silencer, simple in construction,
By setting the sound-deadening and noise-reducing structure of different structure to suppress medium, high frequency noise, its shortcoming is that a kind of structure can only inhale at present
Single-frequency noise is received, noise reduction frequency band is narrow.And in actual use, blower fan also becomes with change of external conditions, frequency noise
Change.During use, by adding porous material or design loose structure to strengthen erasure effect, so in resonant cavity inwall
Not only increase product manufacture complexity, also increase cost.Loose structure acoustically effective for some materials may not be managed
Think, each resonant structure has an identical intrinsic frequency, and this intrinsic frequency is cut by the small aperture d of resonant structure, hole
Area s and cavity volume V are determined.Due to sharing same cavity below porous plate, cause resonance bands narrow, can only absorb single
Frequency noise, noise reduction frequency band is narrow, and noise reduction is poor, and noise is big when causing blower fan work, poor user experience.
The content of the invention
The defects of for prior art, it is an object of the invention to provide a kind of manufacturing process is simple, manufacturing cost is low
Multi-frequency noise, noise reduction bandwidth, the suppression noise structure for blower fan of excellent noise reduction effect can be absorbed.
To achieve the above object, the technical scheme is that：
A kind of suppression noise structure for blower fan, including the support with groove, the support lower section connect annular wind deflector,
The outer face of the annular wind deflector is reducing housing, and its upper surface sets the first flat portion, inside and outside the pedestal lower end face is set
Two layers of ring wall, the first silencing cavity is formed between two layers of ring wall, internal ring wall lower surface opens up tiny groove, and the ring wall of the support contradicts
In in the first flat portion on reducing housing, noise enters in the first silencing cavity from tiny groove, and absorbed noise is in the first noise reduction
Chamber impact several times, reduce noise.The present invention is mountable to fan outlet and/or air inlet, and purposes scope is wide, by setting the
One silencing cavity, for absorbing noise, manufacturing process is simple, manufacturing cost is low, while can absorb multi-frequency noise, noise reduction frequency
Bandwidth, excellent noise reduction effect.
As optimization technique measure, some dividing plates are set between the both sides ring wall, the first silencing cavity are divided into some
Small silencing cavity, which part dividing plate open up breach.First silencing cavity is divided into multiple small silencing cavities, between form resonance coupling
Structure, Sound absorbing spectrum is expanded, strengthen noise reduction.
As optimization technique measure, the support sets the first collection vane face extended obliquely upward, the annular wind-guiding
Plate sets the second collection vane face upwardly extended, and the second collection vane face keeps certain distance with the first collection vane face, formed
Collect air port.Noise initially enters the first collection vane face and second and collects the long and narrow of vane face formation before the first silencing cavity is entered
In circular bore, noise does not stop reciprocating motion and forms air column, noise energy is reduced, when the frequency and resonance sound-absorbing of external sound wave
When the intrinsic frequency of structure is identical, covibration will be produced, this is that amplitude reaches maximum, and air column is reciprocating in aperture
Speed is maximum, and a similar spring model, friction loss is maximum, and the acoustic energy of absorption also reaches maximum so that noise energy by
Decrescence small, acoustic pressure reduces.
As optimization technique measure, one sound chamber lid of installation, the sound chamber lid upper surface end below the annular wind deflector
Second horizontal part is set, and the annular wind deflector cover sets sound chamber lid, and its lower surface is contacted on the second horizontal part, between the two spiral shell
Connect, can be coupled by coarse thread screw and ensure sound chamber lid and annular wind deflector contact area sealing reliability, while convenient dismounting.
As optimization technique measure, through hole is opened up among the sound chamber lid, and upwardly extends and to form the 3rd collection vane face, institute
State the 3rd collection vane face and keep certain distance with the second collection vane face, form the second silencing cavity.First silencing cavity is divided into multiple
Sound chamber, between form resonance coupling structure, then form multi-cavity resonance coupling structure again with the second noise reduction cavity configuration, expand sound absorption
Frequency spectrum, increase noise reduction.
As optimization technique measure, the first collection vane face integrate port in vane face apart from as d1 with second, and described the
Two collection vane faces integrates the port distance in vane face as d2 with the 3rd, of the invention according to Helmholz resonance silencer principle, by outer
Exciting and consuming its energy for sound field turns into sound absorber, and to make its acoustically effective reach optimal, d1, d2 span are in 0.5mm-
Between 3mm.
As optimization technique measure, the support, annular wind deflector, sound chamber lid three are concentric axle construction, from top to bottom
It is arranged in order, is easy to assembling to safeguard.
As optimization technique measure, the annular wind deflector centre position opens up the catchment port of up/down perforation, the afflux
The a diameter of L2, a diameter of L1 of support groove, a diameter of L3 of the sound chamber lid through hole of mouth, L1, L2, L3 three phase
Deng, it is possible to reduce pipeline is uneven and produces and generation noise and air intake resistance influence are hit on wall.
As optimization technique measure, the sound chamber lid lower end opens up the neck for installing mask, ensures that overall structure is tight
Gather, be easy to manufacture, it is cost-effective.
As optimization technique measure, suppress noise structure and be provided for the framework that cover sets blower fan, the framework is square shell
Body, its internal parts is effectively protected, avoid being damaged by other extraneous things, while play certain noise reduction.
Compared with prior art, the invention has the advantages that：
The present invention sets the first silencing cavity, and for absorbing noise, manufacturing process is simple, manufacturing cost is low, while can absorb more
Kind frequency noise, noise reduction bandwidth, excellent noise reduction effect.
Further, the first silencing cavity is divided into multiple sound chambers, between formed resonance coupling structure, then with the second silencing cavity knot
Structure forms multi-cavity resonance coupling structure again, expands Sound absorbing spectrum, increases noise reduction.
The present invention is used directly for the blower fan noise reduction of wind warm-air drier or ventilation fan or new blower fan, and structure is easy to manufacture, side
Case is practical.
Brief description of the drawings
Fig. 1 is the structural representation of present invention assembling blower fan；
Fig. 2 is the first silencing cavity structure sectional view of the invention；
Fig. 3 is the second silencing cavity structure sectional view of the invention；
Fig. 4 is supporting structure schematic diagram of the present invention；
Fig. 5 is support of the present invention, annular wind deflector and sound chamber lid sectional view.
Description of reference numerals：
1- supports, 2- annular wind deflectors, 3- sound chamber lids, 4- frameworks, 5- blower fans, the 6- crusts of weathering, 7- annular support members, 8- masks, 11-
Internal ring wall, 12- external annulus, the tiny grooves of 13-, 14- dividing plates, 15- breach, the collection vanes of 16- first face, 17- grooves, 21- first are flat
Portion, 22- second collect vane face, 23- catchment ports, and 31- the 3rd collects vane face, the second flat portions of 32-, 33- through holes, 34- necks.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiied
Change, equivalent method and scheme.Further, in order that the public has a better understanding to the present invention, below to the thin of the present invention
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
Description can also understand the present invention completely.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.On the contrary, when element be referred to as " directly existing " another element " on " when,
In the absence of intermediary element.Term as used herein " on ", " under " and similar statement is for illustrative purposes only.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term as used herein is intended merely to describe the purpose of specific embodiment, no
It is intended to the limitation present invention.
As Figure 1-5, a kind of suppression noise structure for blower fan, including the support 1 with groove 17, the crust of weathering 6, ring
Shape support member 7, sound chamber lid 3, mask 8.Suppress noise structure and be provided for the framework 4 that cover sets blower fan 5, the framework 4 is square
Housing, the support 1 are installed on the lower section of blower fan 5, one annular wind deflector 2 of the lower section of support 1 connection.The lower end of sound chamber lid 3
The neck 34 for installing mask 8 is opened up, ensures that overall structure is simple, it is cost-effective.The support 1, annular wind deflector 2, sound
The three of chamber lid 3 is concentric axle construction, is arranged in order from top to bottom.The annular support member 7 includes ring-shaped P TC and support arm.
The outer face of the annular wind deflector 2 is reducing housing, and its upper surface sets the first flat portion 21, under the support 1
Two layers of ring wall inside and outside the setting of end face, it includes internal ring wall 11, external annulus 12, the first silencing cavity, inner ring is formed between two layers of ring wall
The lower surface of wall 11 opens up tiny groove 13, and the ring wall of the support 1 is contacted in the on reducing housing first flat portion 21, the both sides
Some dividing plates 14 are set between ring wall, the first silencing cavity are divided into some small silencing cavities, which part dividing plate 14 opens up breach
15, dividing plate 14 also acts as the effect of the intensity of reinforced support 1.Noise enters in the first silencing cavity from tiny groove 13, absorbed noise
In the first silencing cavity impact several times, noise is reduced.
The support 1 sets extend obliquely upward first to collect vane face 16, and the annular wind deflector 2, which is set, to be upwardly extended
The second collection vane face 22, the second collection vane face 22 keeps certain distance with the first collection vane face 16, is formed and collect air port.Institute
One sound chamber lid 3 of the annular lower section of wind deflector 2 installation, second horizontal part of upper surface end set of sound chamber lid 3 are stated, the annular is led
The cover of aerofoil 2 sets sound chamber lid 3, and its lower surface is contacted on the second horizontal part.Through hole 33 is opened up among the sound chamber lid 3, and upwards
Extension forms the 3rd collection vane face 31, and the 3rd collection vane face 31 and the second collection vane face 22 keep certain distance, formation the
Two silencing cavities.The centre position of annular wind deflector 2 opens up the catchment port 23 of up/down perforation, the catchment port 23 it is a diameter of
L2, a diameter of L1 of the groove 17 of support 1, a diameter of L3 of the through hole 33 of sound chamber lid 3, L1, L2, L3 three is equal, can
Produce to hit wall to reduce pipeline uneven and produce noise and air intake resistance influence.
The noise-reducing structure of the present invention uses Helmholz resonance silencer principle, is excited by outer sound field and consumes its energy
As sound absorber.To make acoustically effective reach optimal, its size design also has strict demand.According to Helmholz resonance silencer
The simple expression formula of resonant frequency：
In formula：F0 is the resonant frequency of Helmholz resonance silencer, and с is the velocity of sound, and s is neck or the sectional area of opening, d be neck or
The diameter of opening, l are the length of neck, and V is the volume of container.In the case where intensity is certain sound wave effect, in this resonant frequency,
The vibration velocity of air is maximum in neck.If d size is sufficiently small, neck interior air-flow due to air viscous drag and generation sound
Resistance, is advantageous to more preferably to suppress air inlet to go out noise.Described first, which collects the port distance that vane face 16 and second collects vane face 22, is
D1, the port distance that the second collection vane face 22 and the 3rd integrates vane face 31 are calculated by above-mentioned formula and understood as d2, d1,
D2 spans are between 0.5mm-3mm.
When blower fan 5 operates, noise caused by blower fan 5 mainly collects the intracavitary of groove 17 of medium-height trestle 1, by setting annular to lead
Aerofoil 2 and sound chamber lid 3, noise can be respectively by the of the second collection vane face 22 of annular wind deflector 2 and sound chamber lid 3 in groove 17
Three collection vane faces 31 guide, and are smoothly absorbed by the first silencing cavity and the second silencing cavity, absorbed noise in the second silencing cavity and
First silencing cavity impact several times, have weakened in this Process Energy.And noise initially enters before the first silencing cavity is entered
In the long and narrow circular bore that first collection vane face 16 and the second collection vane face 22 are formed, noise does not stop reciprocating motion and forms air
Post, noise energy is reduced, when the frequency of external sound wave and the identical intrinsic frequency of resonance sound-absorbing structure, it is existing that resonance will be produced
As this is that amplitude reaches maximum, and the reciprocating speed of air column is maximum in aperture, a similar spring model, friction loss
Maximum, the acoustic energy of absorption also reach maximum so that noise energy is gradually reduced, and acoustic pressure reduces.First silencing cavity segmentation simultaneously
Into multiple sound chambers, between form resonance coupling structure, then form multi-cavity resonance coupling structure again with the second noise reduction cavity configuration, expansion
Sound absorbing spectrum.
Through overtesting, in 300Hz ~ 6000Hz frequency band, pass through the second silencing cavity and the first silencing cavity（Multicarity）
The multi-cavity resonance coupling structure of formation, expands noise reduction spectral bandwidth, improves resonance coupling structure and suppresses noise result, passes through
The present invention is at least more than noise reduction 1.6dB.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of suppression noise structure for blower fan, including with groove（17）Support（1）, it is characterised in that the branch
Frame（1）Lower section connects annular wind deflector（2）, the annular wind deflector（2）Outer face be reducing housing, its upper surface sets the
One flat portion（21）, the support（1）Lower surface set inside and outside two layers of ring wall, form the first silencing cavity, inner ring between two layers of ring wall
Wall（11）Lower surface opens up tiny groove（13）, the support（1）The first flat portion for contacting on reducing housing of ring wall（21）On,
Noise is from tiny groove（13）Into in the first silencing cavity, absorbed noise is in the first silencing cavity impact several times, reduction noise.
2. a kind of suppression noise structure for blower fan as claimed in claim 1, it is characterised in that between the both sides ring wall
Some dividing plates are set（14）, the first silencing cavity is divided into some small silencing cavities, which part dividing plate（14）Open up breach（15）.
A kind of 3. suppression noise structure for blower fan as claimed in claim 1, it is characterised in that the support（1）Set
The the first collection vane face extended obliquely upward（16）, the annular wind deflector（2）The the second collection vane face upwardly extended is set
（22）, the second collection vane face（22）With the first collection vane face（16）Certain distance is kept, forms collection air port.
A kind of 4. suppression noise structure for blower fan as claimed in claim 3, it is characterised in that the annular wind deflector
（2）Lower section is installed by one sound chamber lid（3）, the sound chamber lid（3）The horizontal part of upper surface end set second, the annular wind deflector
（2）Cover sets sound chamber lid（3）, its lower surface is contacted on the second horizontal part.
A kind of 5. suppression noise structure for blower fan as claimed in claim 4, it is characterised in that the sound chamber lid（3）In
Between open up through hole（33）, and upwardly extend and to form the 3rd collection vane face（31）, the 3rd collection vane face（31）With the second collection wind
Anchor ring（22）Certain distance is kept, forms the second silencing cavity.
A kind of 6. suppression noise structure for blower fan as claimed in claim 5, it is characterised in that the first collection vane face
（16）With the second collection vane face（22）Port distance be d1, described second collects vane face（22）With the 3rd collection vane face（31）'s
Port distance is d2, and d1, d2 span are between 0.5mm-3mm.
A kind of 7. suppression noise structure for blower fan as claimed in claim 4, it is characterised in that the support（1）, annular
Wind deflector（2）, sound chamber lid（3）Three is concentric axle construction, is arranged in order from top to bottom.
A kind of 8. suppression noise structure for blower fan as claimed in claim 7, it is characterised in that the annular wind deflector
（2）Centre position opens up the catchment port of up/down perforation（23）, the catchment port（23）A diameter of L2, support（1）Groove（17）
A diameter of L1, the sound chamber lid（3）Through hole（33）A diameter of L3, L1, L2, L3 three is equal.
A kind of 9. suppression noise structure for blower fan as described in claim 1-8 is any, it is characterised in that the sound chamber lid
（3）Lower end is opened up for installing mask（8）Neck（34）.
10. a kind of suppression noise structure for blower fan as claimed in claim 9, it is characterised in that suppress noise structure and set
Put and set blower fan for cover（5）Framework（4）, the framework（4）For square casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711173550.3A CN107882777A (en) | 2017-11-22 | 2017-11-22 | A kind of suppression noise structure for blower fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711173550.3A CN107882777A (en) | 2017-11-22 | 2017-11-22 | A kind of suppression noise structure for blower fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107882777A true CN107882777A (en) | 2018-04-06 |
Family
ID=61778035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711173550.3A Pending CN107882777A (en) | 2017-11-22 | 2017-11-22 | A kind of suppression noise structure for blower fan |
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| Country | Link |
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| CN (1) | CN107882777A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240582A (en) * | 2020-09-15 | 2021-01-19 | 宁波方太厨具有限公司 | Fan, range hood and noise reduction method of fan |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05106893A (en) * | 1991-10-18 | 1993-04-27 | Matsushita Seiko Co Ltd | Ventilating fan |
| US20100175411A1 (en) * | 2009-01-09 | 2010-07-15 | Lg Electronics Inc. | Air conditioner |
| US20100189547A1 (en) * | 2006-11-02 | 2010-07-29 | Panasonic Corporation | Centrifugal Fan |
| JP2010255450A (en) * | 2009-04-22 | 2010-11-11 | Panasonic Corp | Centrifugal blower |
| CN107339264A (en) * | 2017-03-15 | 2017-11-10 | 宁波方太厨具有限公司 | A kind of blower fan system auxiliary denoising device of single air-inlet range hood |
| CN207539095U (en) * | 2017-11-22 | 2018-06-26 | 奥普家居股份有限公司 | A kind of inhibition noise structure for wind turbine |
-
2017
- 2017-11-22 CN CN201711173550.3A patent/CN107882777A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05106893A (en) * | 1991-10-18 | 1993-04-27 | Matsushita Seiko Co Ltd | Ventilating fan |
| US20100189547A1 (en) * | 2006-11-02 | 2010-07-29 | Panasonic Corporation | Centrifugal Fan |
| US20100175411A1 (en) * | 2009-01-09 | 2010-07-15 | Lg Electronics Inc. | Air conditioner |
| JP2010255450A (en) * | 2009-04-22 | 2010-11-11 | Panasonic Corp | Centrifugal blower |
| CN107339264A (en) * | 2017-03-15 | 2017-11-10 | 宁波方太厨具有限公司 | A kind of blower fan system auxiliary denoising device of single air-inlet range hood |
| CN207539095U (en) * | 2017-11-22 | 2018-06-26 | 奥普家居股份有限公司 | A kind of inhibition noise structure for wind turbine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240582A (en) * | 2020-09-15 | 2021-01-19 | 宁波方太厨具有限公司 | Fan, range hood and noise reduction method of fan |
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