CN110259725A - It is a kind of for the spiral case of centrifugal blower and the method for noise reduction control of the spiral case - Google Patents
It is a kind of for the spiral case of centrifugal blower and the method for noise reduction control of the spiral case Download PDFInfo
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- CN110259725A CN110259725A CN201910463503.5A CN201910463503A CN110259725A CN 110259725 A CN110259725 A CN 110259725A CN 201910463503 A CN201910463503 A CN 201910463503A CN 110259725 A CN110259725 A CN 110259725A
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- Prior art keywords
- noise
- subregion
- noise reduction
- spiral case
- blueline
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
-
- 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
-
- 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)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a kind of spiral cases for centrifugal blower, including ring wall and volute tongue, denoising device is provided on the inside of the ring wall, it is characterized by: the ring wall is divided into multiple subregions, the denoising device is provided in each subregion, the denoising device in each subregion includes the noise reducing mechanism that specific aim noise reduction is carried out to the noise in each subregion.Also disclose a kind of method for noise reduction control of spiral case as described above.Compared with the prior art, the advantages of the present invention are as follows: subregion is carried out by the ring wall to spiral case, noise reduction is carried out for the noise in each subregion, targetedly noise reduction can be completed, improve noise reduction capability；By making the radius of curvature in each subregion identical, the average value gap of noise can be made little, error when noise measuring can be effectively reduced in this way；By using noise reducing mechanism made of piezoelectric material, targetedly noise reduction can be carried out according to the different of frequency noise, further increase noise reduction effect.
Description
Technical field
The present invention relates to power device, especially a kind of spiral case for centrifugal blower, and a kind of noise reduction of the spiral case
Control method.
Background technique
Centrifugal blower be it is a kind of rotated by blower interior impeller, when work, revolves the air near impeller also therewith
Turn, thus generate centrifugal movement, and under the barrier effect of volute of blower, centrifugal movement can be converted to blower pressure and by
This generates the power device of certain air mass flow.Centrifugal blower has structure installation simple, and ventilation quantity is big and wind pressure height etc. is excellent
Point, to be widely used in cooking fume control equipment, air cleaning facility.
But centrifugal blower have the shortcomings that one it is obvious, i.e., work noise is big.The life of this noise on human, work
Work etc. cannot be neglected influence.The Main Noise Sources of centrifugal blower include: that aerodynamic noise, electromagnetic noise and machinery are made an uproar
Sound.
The prior art for noise of motor solution mainly in outside, such as positions such as front shroud of blower fan system
The drawbacks of place, this method is exactly that noise reduction effect is unobvious, targetedly can not carry out noise reduction by the noise to different frequency range.For
This, there is now the centrifugal blower of some noise reductions, and one kind as disclosed in the Chinese patent application No. is 201510114450.8 is adopted
With the centrifugal blower volute of particle damped vibration attenuation, including spiral case ontology, spiral case ontology is equipped with air inlet, and spiral case ontology is by inner spiral casing
It is constituted with outer spiral casing, forms a vibration and noise reducing chamber between inner spiral casing and outer spiral casing, subtract in vibration and noise reducing chamber filled with damping
Shake particle.This noise measuring and noise reduction are mainly based upon semi-anechoic room's method, then pass through the size of change spiral case or impeller
Parameter carries out noise reduction test again repeatedly, compares further iteration optimization by test result and reaches noise reduction purpose, this method
Drawback is that comparability is not high, and machinery repeats and effect is bad.
In addition, at present some commonly by piezoelectric material be denoising structure progress noise reduction in the way of, application No. is
201410836792.6 Chinese patent disclosed in a kind of controllable sound absorption structure, application No. is 201410843082.6 China specially
A kind of controllable compound sound-absorption structural disclosed in benefit, by run through on piezoelectric membrane multiple holes as perforated plate or acoustic board with
Matrix is connected to form sound absorption structure, can deform this principle with piezoelectric material making alive so that aperture change to
Frequency changes and noise reduction, however the deflection of piezoelectric material can not determine, thus can not pointedly carry out noise reduction.
Summary of the invention
First technical problem to be solved by this invention is in view of the above-mentioned problems of the prior art, providing a kind of use
In the spiral case of centrifugal blower, noise reduction capability can be improved, is realized mute.
Second technical problem to be solved by this invention is to provide a kind of method for noise reduction control of above-mentioned spiral case.
The present invention solves technical solution used by above-mentioned first technical problem are as follows: a kind of snail for centrifugal blower
Shell, including ring wall and volute tongue, the ring wall inside are provided with denoising device, it is characterised in that: and the ring wall is divided into multiple subregions,
The denoising device is provided in each subregion, the denoising device in each subregion includes carrying out needle to the noise in each subregion
To the noise reducing mechanism of property noise reduction.
To make the average value gap of noise in each subregion little, error when noise measuring, Mei Gefen is effectively reduced
In area, the radius of curvature of the molded line of the spiral case it is identical.
Preferably, it with, a little for starting point, the center of the spiral case inlet pressure is the center of circle at the volute tongue, the center of circle and rises
Baseline of the line of point as subregion, the baseline rotate clockwise certain angle around the center of circle and obtain the first blueline, the base
Region between line and the first blueline is the first subregion；First blueline rotates clockwise certain angle around the center of circle and obtains
Second blueline, the region between first blueline and the second blueline are the second subregion；Second blueline is around circle
Hour hands of being in a good mood rotate by a certain angle to obtain third blueline, and the region between second blueline and third blueline is third
Subregion；The third blueline rotates clockwise certain angle around the center of circle and obtains the 4th blueline, the third blueline and
Region between four bluelines is the 4th subregion；Region between 4th blueline and baseline is the 5th subregion.
It further, is the frequency noise convenient for obtaining each subregion, the denoising device further includes corresponding for detecting
The noise measuring mechanism of noise in subregion.
Preferably, the noise reducing mechanism uses Helmholtz's silencer, and the noise reducing mechanism includes cavity and neck, described
Cavity on the inside of neck and ring wall by connecting.
Carry out targetedly noise reduction for the noise of different frequency can be directed to, widen noise reduction frequency range, the cavity by
Piezoelectric material is made, and is applied with the voltage that can be controlled according to different frequency sections noise on each cavity, between each cavity
It is connected in series.
The present invention solves technical solution used by above-mentioned second technical problem are as follows: a kind of drop of spiral case as described above
Make an uproar control method: it is characterized by comprising following steps:
1) centrifugal blower applied by the spiral case is opened, and the noise measuring mechanism of each subregion is opened, and carries out noise measuring,
Thus the noise of each subregion is obtained；
2) size of each subregion noise is ranked up, thus obtains the sequence of each subregion noise reduction, noise is bigger, and noise reduction is suitable
Sequence is more forward；After each subregion noise reduction, noise measuring is carried out again, is judged whether lower than preset level of noise, if it is not, then weight
Multiple current partition noise reduction, if it is, into the smaller subregion noise reduction program of noise；And so on, complete noise reduction.
More targetedly to carry out noise reduction, when each subregion noise reduction, the voltage on the cavity of noise reducing mechanism be adjusted to
The corresponding gear of currently detected noise.
Compared with the prior art, the advantages of the present invention are as follows: subregion is carried out by the ring wall to spiral case, for each subregion
Interior noise carries out noise reduction, can complete targetedly noise reduction, improves noise reduction capability；By making the radius of curvature in each subregion
It is identical, the average value gap of noise can be made little, error when noise measuring can be effectively reduced in this way；By using piezoelectricity
Noise reducing mechanism made of material can carry out targetedly noise reduction according to the different of frequency noise, further increase noise reduction effect.
Detailed description of the invention
Fig. 1 is the schematic diagram of the spiral case of the embodiment of the present invention；
Fig. 2 is the ring wall of the spiral case of the embodiment of the present invention and the schematic diagram of denoising device；
Fig. 3 is the front view of the ring wall of the spiral case of the embodiment of the present invention；
Fig. 4 is the schematic diagram of the noise reducing mechanism of the spiral case of the embodiment of the present invention.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Referring to figs. 1 to 4, a kind of spiral case for centrifugal blower, including front cover 1, rear cover 2 and setting are in 1 and of front cover
Ring wall 3 between rear cover 2 is formed with volute tongue 4 on above-mentioned component, is provided with denoising device on the inside of ring wall 3.
Even under same revolving speed, the different location noise inside spiral case is also different, noise near volute tongue 4
It is maximum.Therefore, the present invention proposes that a kind of subregion reduces the scheme of spiral case noise.
The ring wall 3 of spiral case is divided for 5 subregions, specifically, the molded line of ring wall 3 to be considered as to approximate circle structure, the center of circle
For O (on the axis of the impeller of the centrifugal blower applied by spiral case), that at volute tongue 4 is a little starting point O ', center of circle O and starting point O '
Baseline L1 of the line as subregion, around the center of circle, O rotates clockwise certain angle and obtains the first blueline L2, area between the two
Domain is the first subregion Q1, and angle between the two is preferably 45 °, in the first subregion Q1,3 molded line each point radius of curvature phase of ring wall
Together, preferably 89mm；First blueline L2 rotates clockwise certain angle around center of circle O and obtains the second blueline L3, between the two
Region be the second subregion Q2, angle between the two is preferably 65 °, in the second subregion Q2,3 molded line each point curvature of ring wall half
Diameter is identical, preferably 101mm；Second blueline L3 rotates clockwise certain angle around center of circle O and obtains third blueline L4, the two
Between region be third subregion Q3, angle between the two is preferably 115 °, in third subregion Q3,3 molded line each point of ring wall
Radius of curvature is identical, preferably 130mm；Third blueline L4 rotates clockwise certain angle around center of circle O and obtains the 4th blueline
L5, region between the two are the 4th subregion Q4, and angle between the two is preferably 80 °, in the 4th subregion Q4,3 type of ring wall
Line each point radius of curvature is identical, preferably 117mm；Region between 4th blueline L5 and baseline L1 is the 5th subregion Q5, the
Five subregion Q5 are interior, 3 molded line each point radius of curvature of ring wall is identical, preferably 130mm.
By subregion obtained by the above method, i.e., according to noise testing and simulation result and design criteria, the first subregion is
Near volute tongue, it is followed successively by the second subregion, third subregion, the 4th subregion, the 5th subregion to rotate clockwise, main foundation is curvature
The radius of curvature of the difference of radius, each subregion is almost the same, and the average value gap of noise is little, can be effectively reduced make an uproar in this way
Error when sound detects, is completely covered, so that more targeted be adjusted.
Denoising device includes the multiple noise reducing mechanisms 51 being arranged in each subregion and (such as sound biography of noise measuring mechanism 52
Sensor) and.In order to prevent when noise measuring, noise measuring mechanism 52 interferes with each other, and noise measuring mechanism 52 is located at each point
The center position in area, therefore it is a major advantage that avoid being closer generation interference between subregion convenient for acquisition noise signal；Every time
Data n times are acquired when detection, are averaged.
Noise reducing mechanism 51 in each subregion can carry out noise reduction for fixed frequency noise, and such as different subregions is arranged
The noise reducing mechanism 51 of different noise reduction frequencies.
Alternatively, noise reducing mechanism 51 includes cavity 511 and neck 512, cavity 511 on the inside of neck 512 and ring wall 3 by connecting
It connects.Cavity 511 and neck 512 are cylinder, and the size of cavity 511 is greater than size (the primarily radial ruler of neck 512
It is very little).Cavity 511 is made out of a piezoelectric material, and can apply voltage thereon.Noise reducing mechanism 51 and common Helmholtz's silencer phase
Than the noise reduction range with wider frequency rate designs sound-absorbing structure in conjunction with piezoelectric material inverse piezoelectric effect, so that noise reduction frequency can be with
Change with the change of noise of motor frequency, common Helmholtz's silencer is that do not have this feature, because of motor
Noise frequency be generally not that constant, but continually changing, common Helmholtz's silencer is not able to satisfy its frequency
Variation.
Pass through the calculation formula of resonant frequencyIt can be seen that working as 511 radius of cavity, height and neck
After 512 radius of portion, height dimension determine, resonant frequency is just uniquely determined, so noise reduction range is narrow, utilizes piezoelectricity
The inverse piezoelectric effect of material makes noise frequency shift and widen by the change of 511 volume of cavity.511 body of cavity as a result,
After product changes, so that noise reduction frequency following noise frequency changes, achieve the effect that real-time noise-reducing.
For example, the voltage being applied on cavity 511 is divided into high, medium and low third gear, and when detecting current noise, unlatching pair
The structure answered while applying voltage piezoelectric material is deformed, so that cavity volume is made to change, it can be pointedly
The noise of current frequency is eliminated.
Noise reducing mechanism 51 proposed by the invention, principle of noise reduction are similar to acoustic metamaterial, are individual one by one
Structure, the corresponding frequency of each structure, each structure and piezoelectric material constitute sound absorption structure.Different cavitys 511 it
Between voltage control be to be connected in series, each frequency band has a voltage controller targetedly to be controlled, Ke Yiyou
Effect guarantees the deflection of piezoelectric material.Therefore can for multi-frequency section carry out noise reduction control, be respectively divided into high band, Mid Frequency,
Low-frequency range not only effective noise reduction but also can widen noise reduction frequency range.
The method for noise reduction control of above-mentioned spiral case, includes the following steps:
1) centrifugal blower applied by spiral case is opened, and is operated normally, and the noise measuring mechanism 52 of each subregion is opened, and is made an uproar
Sound detection, thus obtains the noise of each subregion, and the central controller for being transmitted to range hood (is also possible to independent control
Device)；
2) central controller is ranked up the size of each subregion noise, thus obtains the sequence of each subregion noise reduction, noise
Bigger, noise reduction sequence is more forward；I.e. noise is maximum, then carries out noise reduction at first, and noise is minimum, then finally carries out noise reduction；Such as the
One subregion Q1 noise is maximum, then first noise reduction is carried out to the first subregion Q1, so that the noise reducing mechanism 51 in the first subregion Q1 is adjusted to
With the voltage of currently detected frequency noise respective notch；It is current that noise measuring mechanism 52 in first subregion Q1 continues monitoring
Noise, and be transmitted to central controller, judge whether lower than preset level of noise, if it is not, then repeating the first subregion Q1 drop
It makes an uproar, if it is, being only smaller than the subregion noise reduction program of the first subregion Q1 into noise；And so on, complete noise reduction.
Claims (8)
1. a kind of spiral case for centrifugal blower, including ring wall (3) and volute tongue (4), ring wall (3) inside is provided with noise reduction dress
It sets, it is characterised in that: the ring wall (3) is divided into multiple subregions, is provided with the denoising device in each subregion, in each subregion
Denoising device include in each subregion noise carry out specific aim noise reduction noise reducing mechanism (51).
2. the spiral case according to claim 1 for centrifugal blower, it is characterised in that: interior, the described spiral case of each subregion
The radius of curvature of molded line is identical.
3. the spiral case according to claim 2 for centrifugal blower, it is characterised in that: with a bit at the volute tongue (4)
For starting point (O '), the center of the spiral case inlet pressure is the center of circle (O), and the line of the center of circle (O) and starting point (O ') is as subregion
Baseline (L1), the baseline (L1) rotate clockwise certain angle around the center of circle (O) and obtain the first blueline (L2), the baseline
(L1) region between the first blueline (L2) is the first subregion (Q1)；First blueline (L2) is around the center of circle (O) up time
Needle rotates by a certain angle to obtain the second blueline (L3), the region between first blueline (L2) and the second blueline (L3)
For the second subregion (Q2)；Second blueline (L3) rotates clockwise certain angle around the center of circle (O) and obtains third blueline
(L4), the region between second blueline (L3) and third blueline (L4) is third subregion (Q3)；The third subregion
Line (L4) rotates clockwise certain angle around the center of circle (O) and obtains the 4th blueline (L5), the third blueline (L4) and the 4th
Region between blueline (L5) is the 4th subregion (Q4)；Region between 4th blueline (L5) and baseline (L1) is the
Five subregions (Q5).
4. the spiral case described in any one of claim 1 to 3 for centrifugal blower, it is characterised in that: the noise reduction dress
Setting further includes noise measuring mechanism (52) for detecting noise in respective partition.
5. the spiral case according to claim 4 for centrifugal blower, it is characterised in that: the noise reducing mechanism (51) uses the last of the twelve Earthly Branches
Mu Huozi silencer, the noise reducing mechanism (51) include cavity (511) and neck (512), and the cavity (511) passes through neck
(512) it is connect with ring wall (3) inside.
6. the spiral case according to claim 5 for centrifugal blower, it is characterised in that: the cavity (511) is by piezoresistive material
Material is made, and the voltage that can be controlled according to different frequency sections noise, each cavity (511) are applied on each cavity (511)
Between be connected in series.
7. a kind of method for noise reduction control of the spiral case as described in any one of claim 4~6, it is characterised in that: including as follows
Step:
1) centrifugal blower applied by the spiral case is opened, and the noise measuring mechanism (52) of each subregion is opened, and carries out noise measuring,
Thus the noise of each subregion is obtained；
2) size of each subregion noise is ranked up, thus obtains the sequence of each subregion noise reduction, noise is bigger, and noise reduction sequence is got over
It is forward；After each subregion noise reduction, noise measuring is carried out again, is judged whether lower than preset level of noise, if it is not, then repeating to work as
Preceding subregion noise reduction, if it is, into the smaller subregion noise reduction program of noise；And so on, complete noise reduction.
8. the method for noise reduction control of spiral case according to claim 7, it is characterised in that: when each subregion noise reduction, noise reduction machine
Voltage on the cavity (511) of structure (51) is adjusted to gear corresponding with currently detected noise.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910463503.5A CN110259725A (en) | 2019-05-30 | 2019-05-30 | It is a kind of for the spiral case of centrifugal blower and the method for noise reduction control of the spiral case |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910463503.5A CN110259725A (en) | 2019-05-30 | 2019-05-30 | It is a kind of for the spiral case of centrifugal blower and the method for noise reduction control of the spiral case |
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| CN110259725A true CN110259725A (en) | 2019-09-20 |
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| CN201910463503.5A Pending CN110259725A (en) | 2019-05-30 | 2019-05-30 | It is a kind of for the spiral case of centrifugal blower and the method for noise reduction control of the spiral case |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110530028A (en) * | 2019-09-23 | 2019-12-03 | 珠海格力电器股份有限公司 | Shell, water heater and method for noise reduction control |
| 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 |
| WO2023273453A1 (en) * | 2021-06-29 | 2023-01-05 | 佛山市顺德区美的洗涤电器制造有限公司 | Fan assembly and household appliance |
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