CN110454421A - A kind of method for noise reduction control of centrifugal blower and the centrifugal blower - Google Patents
A kind of method for noise reduction control of centrifugal blower and the centrifugal blower Download PDFInfo
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- CN110454421A CN110454421A CN201910701914.3A CN201910701914A CN110454421A CN 110454421 A CN110454421 A CN 110454421A CN 201910701914 A CN201910701914 A CN 201910701914A CN 110454421 A CN110454421 A CN 110454421A
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- noise
- subregion
- noise reduction
- blueline
- centrifugal blower
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- 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
-
- 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
-
- 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
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
-
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
-
- 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
- F04D29/422—Discharge tongues
-
- 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
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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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
Abstract
The invention discloses a kind of centrifugal blowers, including spiral case, impeller and denoising device, the spiral case includes ring wall and volute tongue, it is characterized by: the ring wall is divided at least two subregions, the denoising device is active noise reducing device, the active noise reducing device includes the laser displacement sensor being arranged on impeller, and be arranged in each subregion, according to laser displacement sensor survey shift value in respective partition noise carry out specific aim noise reduction noise reduction components.Also disclose range hood and a kind of method for noise reduction control of above-mentioned centrifugal blower that a kind of application has above-mentioned centrifugal blower.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.
Description
Technical field
The present invention relates to power device, the method for noise reduction control of especially a kind of centrifugal blower and above-mentioned centrifugal blower.
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, commonly using some active noise reduction modes at present carries out noise reduction, active noise reducing device is adopted by noise signal
Collect module, signal processing analysis module (main includes control chip and signal amplifier), a sound source generators module
Composition, these three modules are electrically connected by conducting wire, and Noise Acquisition module is for acquisition noise, and by noise transmission to noise processed
The signal received is carried out spectrum analysis, forms noise reduction sequence signal by analysis module, noise processed analysis module, and by the sequence
Column signal is transferred to sound source generators module (such as loudspeaker)；Sound source generators module is issued according to noise reduction sequence signal and noise
Signal amplitude is identical, opposite in phase reversed sound wave, to eliminate noise.However, due in the blower fan system of range hood
Noise is one and has mixed a series of noise such as eddy current crack and rotational noise, therefore the sound of Noise Acquisition is a reverberation
Sound is mingled with many unrelated pectrum noises, and is directed to cooking-fume exhauster blower system special use environment and operation, to noise
The status requirement of acquisition module is very high, and location arrangements are improper, and the noise of acquisition does not have reliability, and the processing in that later period is exactly nothing
Effect, i.e. analysis and processing module is very easy to analyze and frequency spectrum of noise signals reversed sound wave completely not corresponding with phase, leads
It causes the effect of noise reduction excessively poor, therefore need to be further improved.
Summary of the invention
First technical problem to be solved by this invention be in view of the above-mentioned problems of the prior art, provide it is a kind of from
Heart blower can improve noise reduction capability, realize mute.
Second technical problem to be solved by this invention is to provide the range hood that a kind of application has above-mentioned centrifugal blower.
Third technical problem to be solved by this invention is to provide a kind of method for noise reduction control of above-mentioned centrifugal blower.
The present invention solves technical solution used by above-mentioned first technical problem are as follows: a kind of centrifugal blower, including spiral case,
Impeller and denoising device, the spiral case include ring wall and volute tongue, it is characterised in that: the ring wall is divided at least two subregions, institute
Stating denoising device is active noise reducing device, and the active noise reducing device includes the laser displacement sensor being arranged on impeller, with
And it is arranged in each subregion, specific aim drop is carried out to the noise in respective partition according to the shift value of laser displacement sensor survey
The noise reduction components made an uproar.
To make the average value gap of noise in each subregion little, it is more effectively carried out subregion noise reduction, in each subregion,
The radius of curvature of the molded line of the spiral case 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.
For can be preferably with noise matching, the noise reduction components include at least two sound source generators, sound source hair
The audible frequency of raw device is different.
To match the noise profile in blower, more effective for property noise reduction, by the higher sound source generators of spectral phase
Front cover closer to spiral case is arranged, and is successively successively decreased along the spectral phase of ring wall molded line clockwise direction, sound source generators.
To automatically control noise reduction components, the active noise reducing device further includes the letter according to the laser displacement sensor
Number, export to noise reduction components the signal analysis and processing module of reversed noise reduction sequence signal.
The present invention solves technical solution used by above-mentioned second technical problem are as follows: a kind of range hood, feature exist
In: including centrifugal blower as described above.
The present invention solves technical solution used by above-mentioned third technical problem are as follows: a kind of centrifugal blower as described above
Method for noise reduction control, characterized by the following steps:
1) centrifugal blower operates normally after a certain period of time, and the laser displacement sensor on impeller is started to work；
2) when laser displacement sensor is rotated within the scope of each subregion with impeller, the distance between detection and ring wall x,
And corresponding revolving speed r is matched to each different distance x；
3) revolving speed matched is transferred to signal analysis and processing module, signal analysis and processing module extract current rotating speed with
The corresponding relationship of noise spectrum and phase parameter；
4) noise reduction components from signal analysis and processing module to each subregion output with respective partition current noise frequency spectrum and
The corresponding optimal reversed noise reduction sequence of phase parameter；
5) each sound source generators in each subregion issue sound wave according to the signal received and carry out counteracting noise reduction.
It preferably, is noise frequency according to formula f=rZ/60, f in step 3), r is the revolving speed of impeller, and Z is impeller
The number of blade, signal analysis determines the frequency of noise according to revolving speed r, carries out fft analysis to noise, to obtain noise frequency
Spectrum and phase information.
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, subregion noise reduction can be more effectively carried out in this way；By will test revolving speed come
Noise frequency and phase are extracted, detection is reliable, avoids influence factor existing for direct detection noise is more, detection is inaccurate from asking
Topic.
Detailed description of the invention
Fig. 1 is the schematic diagram of the centrifugal blower of the embodiment of the present invention；
Fig. 2 is the schematic diagram of the hiding impeller of the centrifugal blower of the embodiment of the present invention；
Fig. 3 is the front view of the ring wall of the spiral case of the centrifugal blower of the embodiment of the present invention；
Fig. 4 is the functional block diagram of the active noise reducing device of the centrifugal blower 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 centrifugal blower, including spiral case 1 and impeller 2, spiral case 1 (do not show including front cover 11, rear cover
Out) and the ring wall 12 that is arranged between front cover 11 and rear cover, volute tongue 13 is formed on the above-mentioned component of spiral case 1.Of the invention
Centrifugal blower is mainly used in range hood.
Centrifugal blower further includes active noise reducing device, and the active noise reduction component including 12 inside of ring wall is arranged in, setting exists
Laser displacement sensor 36 on impeller 2, in the front ring of especially impeller 2, and for receiving laser displacement sensor 36
For signal to control the signal analysis and processing module 37 of active noise reduction component, which may be provided at spiral case
1 outside or the position of other any fixations.
Even under same revolving speed, the different location noise spiral case 1 inside be also it is different, make an uproar near volute tongue 13
Sound is maximum.Therefore, the present invention proposes that a kind of subregion reduces the scheme of spiral case noise.
The ring wall 12 of spiral case 1 is divided and is justified for 5 subregions specifically, the molded line of ring wall 12 to be considered as to approximate circle structure
The heart is O (on the axis of the impeller of the centrifugal blower applied by spiral case), and that at volute tongue 13 is a little starting point O ', center of circle O and is risen
Baseline L1 of the line of point O ' as subregion, around the center of circle, O rotates clockwise certain angle and obtains the first blueline L2, between the two
Region be the first subregion Q1, angle between the two is preferably 45 °, in the first subregion Q1,12 molded line each point curvature of ring wall
Radius is identical, preferably 89mm；First blueline L2 rotates clockwise certain angle around center of circle O and obtains the second blueline L3, and two
Region between person is the second subregion Q2, and angle between the two is preferably 65 °, and the second subregion Q2 is interior, 12 molded line of ring wall is each
Point radius of curvature is identical, preferably 101mm；Second blueline L3 rotates clockwise certain angle around center of circle O and obtains third subregion
Line L4, region between the two are third subregion Q3, and angle between the two is preferably 115 °, in third subregion Q3, ring wall
12 molded line each point radius of curvature are identical, preferably 130mm；Third blueline L4 rotates clockwise certain angle around center of circle O and obtains
4th blueline L5, region between the two is the 4th subregion Q4, and angle between the two is preferably 80 °, the 4th subregion Q4
It is interior, 12 molded line each point radius of curvature of ring wall is identical, preferably 117mm；Region between 4th blueline L5 and baseline L1 is the
Five subregion Q5, the 5th subregion Q5 are interior, 12 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 Q1
Near volute tongue, it is followed successively by the second subregion Q2, third subregion Q3, the 4th subregion Q4, the 5th subregion Q5 to rotate clockwise, mainly
According to the difference for being radius of curvature, the radius of curvature of each subregion is almost the same, and the average value gap of noise is little, in this way can be with
It is more effectively carried out subregion noise reduction, is completely covered, so that more targeted be adjusted.
Active noise reducing device of the invention is with traditional active noise reduction difference: 1) not needing noise signal acquisition
Module；2) sound source generators module is by the way of cancelling out each other, rather than is only one.The noise signal obtained as a result, is only
It is only a signal, is not in the analysis of reverberation sound effect of signals post-processing, really realizes " one-to-one " noise reduction.
Laser displacement sensor 36 on impeller 2 is revolving in each subregion of the ring wall 12 of spiral case 1 according to when impeller 2
It turns over journey and is relayed to some subregion range, since at the start position for entering this subregion, to the end of this subregion, laser
Displacement sensor 36 detects a range, and the rotary speed data of the subregion is matched for shift value section, is transmitted to signal point later
Processing module 37 is analysed, frequency spectrum and phase parameter are extracted by signal analysis and processing module 37, is normalized and extracts and is optimal anti-
To noise reduction sequence signal, and distributed output is carried out to noise reduction components.
In the present embodiment, the quantity of active noise reduction component is corresponding with the number of partitions of ring wall 12 of spiral case 1, each active
Noise reduction components include at least two sound source generators, it is preferred that sound source generators are loudspeaker.In the present embodiment, using five
A sound source generators, including the first sound source generators 31, the second sound source generators 32, third sound source generators 33, falling tone source
The audible frequency of generator 34 and fifth sound source generator 35, above-mentioned each sound source generators is different, the first sound source generators
31: for eliminating the pectrum noise in 100~300Hz frequency range, the second sound source generators 32: for eliminating 300~600Hz frequency range
Interior pectrum noise, third sound source generators 33: for eliminating the pectrum noise in 600~1000Hz frequency range, falling tone source hair
Raw device 34: for eliminating the pectrum noise in 1000~1400Hz frequency range, fifth sound source generator 35: for elimination 1400~
Pectrum noise in 2000Hz frequency range.
Since the position noise spectral phase on ring wall 12 closer to front cover 11 is higher, clockwise along 12 molded line of ring wall
Spectral phase successively successively decreases.Therefore, in the first subregion Q1, fifth sound source generator 35, falling tone source generator 34 are by nearby
Lid 11, close to rear cover, the first sound source generators 31 are located at central area for third sound source generators 33, the second sound source generators 32,
Fifth sound source generator 35, falling tone source generator 34, the second sound source generators 32, third sound source generators 33 (Fig. 2 clockwise
It is shown clockwise) arrangement.
In the second subregion Q2, fifth sound source generator 35, falling tone source generator 34 are close to front cover 11, third sound source hair
Close to rear cover, the second sound source generators 32 are located at central area, fifth sound source generator for raw device 33, the first sound source generators 31
35, falling tone source generator 34, the first sound source generators 31, third sound source generators 33 are arranged clockwise.
In third subregion Q3, fifth sound source generator 35, falling tone source generator 34 are close to front cover 11, the second sound source hair
Close to rear cover, third sound source generators 33 are located at central area, fifth sound source generator for raw device 32, the first sound source generators 31
35, falling tone source generator 34, the first sound source generators 31, the second arrangement clockwise of sound source generators 32.
In the 4th subregion Q4, fifth sound source generator 35, third sound source generators 33 are close to front cover 11, the second sound source hair
Close to rear cover, falling tone source generator 34 is located at central area, fifth sound source generator for raw device 32, the first sound source generators 31
35, third sound source generators 33, the first sound source generators 31, the second arrangement clockwise of sound source generators 32.
In the 5th subregion Q5, falling tone source generator 34, third sound source generators 33 are close to front cover 11, the second sound source hair
Close to rear cover, fifth sound source generator 35 is located at central area, falling tone source generator for raw device 32, the first sound source generators 31
34, third sound source generators 33, the first sound source generators 31, the second arrangement clockwise of sound source generators 32.
The noise-reduction method of above-mentioned centrifugal blower, includes the following steps:
1) after centrifugal blower operates normally certain time, such as 5s, the laser displacement sensor 36 on impeller 2 is started to work；
2) when laser displacement sensor 36 is rotated to impeller 2 within the scope of each subregion of five subregions, laser displacement
The distance between the detection of sensor 36 and ring wall 12 x, x is different in each subregion, according to the section actually measured distance x
The revolving speed r for matching respective partition, such as in the first subregion Q1 distance x1 ∈ (34.7mm, 38.5mm], then corresponding turn of matching
Fast range be r1 ∈ (26r/s, 35r/s]；In the second subregion Q2 distance x2 ∈ (38.5mm, 69mm], then matching is corresponding
The range of speeds be r2 ∈ (35r/s, 75r/s]；In third subregion Q3 distance x3 ∈ (69mm, 97mm], then matching is corresponding
The range of speeds be r3 ∈ (75r/s, 93r/s]；In the 4th subregion Q4 distance x4 ∈ (97mm, 104mm], then matching is corresponding
The range of speeds be r4 ∈ (93r/s, 106r/s]；In the 5th subregion Q5 distance x5 ∈ (104mm, 187mm], then matching is corresponding
The range of speeds be r5 ∈ (106r/s, 150r/s]；The matching relationship of above-mentioned distance x and revolving speed r is storable in laser displacement biography
Sensor 36 or signal analysis and processing module 37, in the present embodiment, to be stored in laser displacement sensor 36；
3) revolving speed matched is transferred to signal analysis and processing module 37, signal analysis and processing module 37 is extracted corresponding
Noise spectrum and phase parameter, to obtain the corresponding noise spectrum of five subregions and phase parameter；In this step, according to public affairs
Formula f=rZ/60, f are noise frequency, and wherein r is the revolving speed of impeller, and Z is the number of blade, and after the completion of centrifugal blower manufacture, Z is
Determine, as long as therefore revolving speed r determine, that is, can determine the frequency of noise, to noise carry out FFT (Fourier transform analysis) analysis,
Noise spectrum and phase information can be obtained；
4) noise reduction components output and respective partition current noise frequency spectrum of the signal analysis and processing module 37 into each subregion
And the corresponding optimal reversed noise reduction sequence of phase parameter, noise can be normalized in signal analysis and processing module 37, small echo
The common signal processing modes of the prior arts such as analysis, then obtain with treated the reversed acoustical phase of noise, according to making an uproar
Sequence (the frequency of each sound source generators occurs for the noise reduction that the frequency and phase parameter of sound obtain each sound source generators in each subregion
Rate, phase and position are certain, therefore, when each sound source generators sounding between sound field the case where offsetting it is known that thus can be according to reality
The sound source generators of border noise control sounding), the noise of more multi-frequency and phase can be directed to；
5) each sound source generators in each subregion issue sound wave according to the signal received and carry out counteracting noise reduction.
By taking the first subregion Q1 as an example, when on impeller 2 laser displacement sensor 36 normally start to work, detect currently away from
It is within the scope of 34.7mm to 38.5mm with a distance from ring wall 12, matching the corresponding range of speeds later is 26r/s~35r/s；
And form transmission signal and be transferred to signal analysis and processing module 37, signal analysis and processing module 37 is believed according to the revolving speed received
Number, corresponding noise spectrum and phase parameter are found, in optimal reversed noise reduction sequence to the first subregion Q1 is exported after processing
One sound source generators 31 and the second sound source generators 32, two sound source generators issue drop according to the acoustic wave sequences signal received
Noise waves.
It is similar, in the second subregion Q2, when laser displacement sensor 36 detect currently at a distance from ring wall 12
When within the scope of 38.5mm to 69mm, corresponding range of speeds 35r/s~75r/s is matched, and be transferred to signal analysis module, signal
Analysis module is sent out according to by a series of analyses processing outbound course noise reduction sequence to the second sound source generators 32 and third sound source
Raw device 33, the two sound source generators issue sound wave noise reduction according to the acoustic signals received.
Claims (9)
1. a kind of centrifugal blower, including spiral case (1), impeller (2) and denoising device, the spiral case (1) include ring wall (12) and snail
Tongue (13), it is characterised in that: the ring wall (12) is divided at least two subregions, and the denoising device is active noise reducing device, institute
Stating active noise reducing device includes the laser displacement sensor (36) being arranged on impeller (2), and is arranged in each subregion, root
The noise reduction components of specific aim noise reduction are carried out to the noise in respective partition according to the shift value of laser displacement sensor (36) detection.
2. centrifugal blower according to claim 1, it is characterised in that: the type curvature of a curve of interior, the described spiral case of each subregion
Radius is identical.
3. centrifugal blower according to claim 2, it is characterised in that: with any at the volute tongue (13) for starting point
(O '), the center of the spiral case inlet pressure are the center of circle (O), baseline of the line of the center of circle (O) and starting point (O ') as subregion
(L1), the baseline (L1) rotates clockwise certain angle around the center of circle (O) and obtains the first blueline (L2), the baseline (L1) and
Region between first blueline (L2) is the first subregion (Q1)；First blueline (L2) rotates clockwise around the center of circle (O)
Certain angle obtains the second blueline (L3), and the region between first blueline (L2) and the second blueline (L3) is second
Subregion (Q2)；Second blueline (L3) rotates clockwise certain angle around the center of circle (O) and obtains third blueline (L4), described
Region between second blueline (L3) and third blueline (L4) is third subregion (Q3)；The third blueline (L4) is around circle
The heart (O) rotates clockwise certain angle and obtains the 4th blueline (L5), the third blueline (L4) and the 4th blueline (L5)
Between region be the 4th subregion (Q4)；Region between 4th blueline (L5) and baseline (L1) is the 5th subregion
(Q5)。
4. centrifugal blower according to claim 1, it is characterised in that: the noise reduction components occur including at least two sound sources
The audible frequency of device, the sound source generators is different.
5. centrifugal blower according to claim 4, it is characterised in that: by the higher sound source generators of spectral phase closer to
The front cover (11) of spiral case (1) arranges, and along ring wall (12) molded line clockwise, the spectral phase of sound source generators successively
Successively decrease.
6. centrifugal blower according to claim 4 or 5, it is characterised in that: the active noise reducing device further includes according to institute
It states the signal of laser displacement sensor (36), export the signal analysis and processing module of reversed noise reduction sequence signal to noise reduction components
(37)。
7. a kind of range hood, it is characterised in that: including centrifugal blower such as according to any one of claims 1 to 6.
8. a kind of method for noise reduction control of centrifugal blower as claimed in claim 6, characterized by the following steps:
1) centrifugal blower operates normally after a certain period of time, and the laser displacement sensor (36) on impeller (2) is started to work；
2) when laser displacement sensor (36) is rotated within the scope of each subregion with impeller (2), between detection and ring wall (12)
Distance x, and corresponding revolving speed r is matched to each different distance x；
3) revolving speed matched is transferred to signal analysis and processing module (37), forward is worked as in signal analysis and processing module (37) extraction
The corresponding relationship of speed and noise spectrum and phase parameter；
4) noise reduction components from signal analysis and processing module (37) to each subregion output with respective partition current noise frequency spectrum and
The corresponding optimal reversed noise reduction sequence of phase parameter；
5) each sound source generators in each subregion issue sound wave according to the signal received and carry out counteracting noise reduction.
9. the method for noise reduction control of centrifugal blower according to claim 8, it is characterised in that: in step 3), according to public affairs
Formula f=rZ/60, f are noise frequency, and r is the revolving speed of impeller, and Z is the number of blade of impeller (2), and the signal analysis is according to revolving speed r
The frequency for determining noise carries out fft analysis to noise, to obtain noise spectrum and phase information.
Priority Applications (1)
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| CN111043637A (en) * | 2020-01-02 | 2020-04-21 | 宁波方太厨具有限公司 | Intelligent adjusting method for noise of range hood |
| CN111207112A (en) * | 2020-01-07 | 2020-05-29 | 宁波方太厨具有限公司 | Centrifugal fan and range hood with same |
| 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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| CN110454421B (en) | 2020-09-01 |
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