CN103169424A - Diffuser capable of effectively reducing passing noise of vanes of motor - Google Patents
Diffuser capable of effectively reducing passing noise of vanes of motor Download PDFInfo
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- CN103169424A CN103169424A CN2011104311754A CN201110431175A CN103169424A CN 103169424 A CN103169424 A CN 103169424A CN 2011104311754 A CN2011104311754 A CN 2011104311754A CN 201110431175 A CN201110431175 A CN 201110431175A CN 103169424 A CN103169424 A CN 103169424A
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Abstract
The invention discloses a diffuser capable of effectively reducing passing noise of vanes of a motor. The diffuser comprises a separating board. Diffusion vanes are arranged on one face of the separating board and are uniformly distributed along the radial direction. Sound wave propagation flow passages are respectively formed between every two adjacent diffusion vanes. A silencer with the quarter wave is arranged in each sound wave propagation flow passage. Each silencer with the quarter wave is formed by blind holes formed in the bottom face of each sound wave propagation flow passage. The axial direction of the blind holes is perpendicular to the sound wave propagation flow passage. Each silencer with the quarter wave comprises two blind holes which are arranged along the propagation direction of each sound wave propagation flow passage. Through utilization of reflection, interference or the resonance phenomenon of sound waves, the diffuser effectively reduces the passing noise and peak noise of the vanes, improves sound quality of the motor and ensures high efficiency of a fan.
Description
Technical field
The present invention relates to a kind of dust catcher muffler, relate in particular to a kind of diffuser that can effectively reduce the motor sound pressure level.
Background technology
In the machine operation process, the formation of noise comprises: the noise that the noise that electromagnetic force causes, air force cause and mechanical noise, wherein, the noise proportion that air force causes is approximately 75%.The harmful effect that noise of motor produces mainly contains two aspects: the one, and, noise jamming people's talk reduces human thinking, makes the people tired, impact rest, work, sleep.Long term exposure easily makes people's impaired hearing in the large environment of noise.The 2nd,, noise of motor has influence on quality and the life-span of motor itself.If can not control noise for noise of motor on sound source, generally can adopt sound insulation and eliminate the noise, and being aided with sound-absorbing material.Wherein, be the most simply sound insulating method, the acoustic hood that can make with steel plate, plank or plastic plate, whole motor is surrounded, can reduces by 20 decibels of left and right, but shortcoming is unfavorable to dispelling the heat, and the space that takies is large, therefore, must consider the caused series of problems of electric machine temperature rise.And sound reduction method refers to fill silencer in gas channel, when guaranteeing that air-flow passes through, and the propagation of prevention or attenuating noise.
Silencer mainly contains resistive silencer and anti-formula silencer.Wherein, the resistive silencer is to cover with porous material the energy that wall consumes sound in pipeline.Anti-formula silencer is by the sudden enlargement of pipeline section or dwindles, or the side connects resonant cavity, makes along the noise of pipe transmmision to reflect back to sound source in sudden change place, reaches the purpose of noise elimination.
The silencer that reactive muffler is comprised of the acoustic reactance element.The acoustic reactance element is the variation to acoustic pressure, the element that sound vibration velocity degree has changed the resistance effect, and they are sound energy consumption not, but can store up and reflection of the acoustic energy.The characteristics of reactive muffler are: it does not use sound-absorbing material, but the pipeline section or the side that connect the abrupt change of cross-section on pipeline connect resonant cavity, utilize the acoustic impedance mismatch, the sound wave that makes some frequency is in phenomenons such as the reflecting at the interface of acoustic impedance sudden change, interference, thereby reaches the purpose of noise elimination.Wherein, include the expansion chambers type, the expansion chambers silencer is also referred to as the expanding chamber silencer, formed by pipe and chamber appropriate combination, it is that the sudden change (being the variation of acoustic reactance) that utilizes pipeline section makes along the sound wave of pipe transmmision and can't pass silencer to the sound source reflection, thereby make the sound energy reflection reposition, reach the noise elimination purpose.
Noise that be used for to control motor of dust collector is to adopt anti-formula silencer principle, and by being provided with diffuser in motor bottom reducing the sound pressure level of noise of motor, diffuser is the circular passage that is formed by design concept by impeller outlet both sides dividing plate.According to the difference of annular channel structure form, diffuser can be divided into vaneless diffuser, vane diffuser and straight wall diffuser.Vaneless diffuser only has two parallel smooth walls to form usually, but the vaneless diffuser diameter is longer, and the gas flow loss is larger.Straight wall diffuser is also that a kind of vane diffuser is at blade exit, one section straight wall passage to be arranged, therefore claim straight wall diffuser, due to the gas channel of straight wall diffuser near linear, so gas flow rates and pressure distribution are more even, be difficult for producing boundary separation and secondary vortex flow, but because its complex structure, manufacture difficulty are large, be difficult to extensive use.Vane diffuser is in the parallel smooth wall of vane diffuser, and when the blade of the some that is uniformly distributed along the circumference and forming, gas medium flowed in vaneless diffuser, deflection remained unchanged substantially, and in vane diffuser, gas efficiency is high.A kind of form of traditional blades diffuser is as shown in Fig. 1-1 and Fig. 1-2, it is a kind of dividing plate blade diffuser for series excited machine, the one side of its median septum 1 is provided with diffusion blade 2, the another side of dividing plate 1 is provided with guide vane 3, running up due to blade in the machine operation process, blade produces periodic disturbance to surrounding air, has very high blade and skims over noise (sound pressure level), and this is the deficiency of traditional blades diffuser.
Summary of the invention
for above-mentioned prior art, the invention provides and a kind ofly can effectively reduce the diffuser that the motor blade skims over noise, the present invention is directed to the motor blade and skim over noise, 1/4 wavelength silencer is applied to diffuser, 1/4 wavelength silencer of the small structure of bottom lock namely is set by the vertical direction at the Acoustic Wave Propagation runner, make the ripple of propagation forward and the sound wave of the different boundary reflections of Acoustic Wave Propagation runner differ from one 180 phase place of spending, to produce amplitude with pipeline with the meet of aperture at the Acoustic Wave Propagation runner equates, single spin-echo, interfere with each other, thereby reach comparatively desirable soundproof effect, thereby can effectively reduce the motor blade and skim over noise.
In order to solve the problems of the technologies described above, the present invention is a kind of can effectively be reduced the technical scheme that diffuser that the motor blade skims over noise is achieved and be: comprise dividing plate, the one side of described dividing plate is provided with the diffusion blade, all diffusion blades are radially uniform, formed the Acoustic Wave Propagation runner between adjacent diffusion blade in twos, be provided with 1/4 wavelength silencer in each Acoustic Wave Propagation runner, described 1/4 wavelength silencer is made of the blind hole that is arranged on Acoustic Wave Propagation runner bottom surface, described blind hole axially vertical with the Acoustic Wave Propagation runner.
Of the present inventionly can effectively reduce the diffuser that the motor blade skims over noise, wherein, described 1/4 wavelength silencer comprises a blind hole, and the degree of depth of described blind hole is h, and its computing formula is as follows:
h＝1/4λ (1)
In formula (1), λ=c/f, λ is for being reduced in the wavelength of noise, and c is the velocity of sound of sound wave, and f is the sound wave respective frequencies, and its span is (500Hz＜f＜10000Hz).
In the present invention, if the another side of described dividing plate is provided with guide vane, described 1/4 wavelength silencer comprises two blind holes, and the degree of depth of each blind hole is less than the height of guide vane, and the degree of depth sum of two blind holes is h,
Compared with prior art, the invention has the beneficial effects as follows:
Diffuser of the present invention is according to 1/4 wavelength silencer operation principle, by its bottom lock and the blind hole structure vertical with the Acoustic Wave Propagation runner are set in the Acoustic Wave Propagation runner between the adjacent blades of blade diffuser, utilize reflection, interference or the covibration of sound wave to reach effective reduction blade and skim over and peak noise, guarantee the high efficiency of fan when improving the motor sound quality.
Description of drawings
Fig. 1-1st, in prior art, a kind of end of motor diffuser dividing plate is to topology view;
Fig. 1-2 is the perspective view of diffuser shown in Fig. 1-1;
Fig. 2-1st, the present invention can effectively reduce the motor blade and skim over the end of diffuser of noise to view;
Fig. 2-2nd, the partial schematic diagram of diffuser stereochemical structure shown in Fig. 2-1;
Fig. 2-3rd, diffuser shown in Fig. 2-2 sectional schematic diagram;
Fig. 2-4th, the cutaway view of the described diffuser stereochemical structure in Fig. 2-1;
Fig. 3 is before improving and improves the flow rate pressure-efficiency curve of aft-fan;
Fig. 4 is before improving and the spectrum curve after improving;
In figure:
1---dividing plate 2---diffusion blade 3---guide vane
4---first blind hole 5---second blind hole
The specific embodiment
Below in conjunction with the specific embodiment, the present invention is described in further detail.
As shown in Fig. 2-1, the present invention is a kind of can effectively reduce the diffuser that the motor blade skims over noise, comprise dividing plate 1, the one side of described dividing plate 1 is provided with diffusion blade 2, all diffusion blades 2 are radially uniform, formed the Acoustic Wave Propagation runner between adjacent diffusion blade 2 in twos, are provided with 1/4 wavelength silencer in each Acoustic Wave Propagation runner, described 1/4 wavelength silencer is made of the blind hole 4 that is arranged on Acoustic Wave Propagation runner bottom surface, described blind hole 4 axially vertical with the Acoustic Wave Propagation runner.
Described 1/4 wavelength silencer comprises a blind hole 4, and the degree of depth of described blind hole 4 is h, and its computing formula is as follows:
h＝1/4λ (1)
In formula (1), λ=c/f, λ is for being reduced in the wavelength of noise, and c is the velocity of sound of sound wave, and f is the sound wave respective frequencies, and its span is (500Hz＜f＜10000Hz).
usually the dividing plate that arranges in series excited machine, except this dividing plate one side is provided with the diffusion blade, to be that the fan that is positioned at this dividing plate another side is lowered the temperature by the air-flow of Acoustic Wave Propagation runner in order to utilize, another side at described dividing plate is provided with guide vane, for the bottom that makes described 1/4 wavelength silencer does not interfere with the space that dividing plate 1 is installed, while is according to the operation principle of 1/4 wavelength silencer, make again and will make the blind hole that consists of 1/4 wavelength silencer have certain degree of depth, therefore, need to be provided with two blind holes in each Acoustic Wave Propagation runner, and the degree of depth of each blind hole is less than the height of guide vane 3, the degree of depth sum of two blind holes is h, , further, at first, calculate the wavelength X of the noise that skims over blade according to following formula, then calculate the degree of depth h of the blind hole of 1/4 wavelength silencer according to formula, if this degree of depth h is greater than the height of guide vane 3, this degree of depth h is decomposed into two value h1 and h2, these two values are arranged on respectively the degree of depth of two blind holes in the Acoustic Wave Propagation runner.
Embodiment: take the diffuser that improves a series excited machine in prior art as example, as shown in Fig. 1-1 and Fig. 1-2, be improved on this basis diffuser of the present invention, as shown in Fig. 2-1 and Fig. 2-2.Wherein, the height of establishing guide vane is 15mm.
As everyone knows, the aerial spread speed of sound is 340m/s, and in addition, the noise frequency of propagating in runner by test sound wave is 4292Hz, therefore, calculates wavelength X=79mm according to following formula (2);
υ＝λ·f (2)
In formula (2), v represents the spread speed of sound, and λ represents the wavelength of sound, and f represents the frequency of sound;
The degree of depth h that calculates this 1/4 wavelength silencer blind hole according to above-mentioned formula (1) is 19.8mm.
Because the height of guide vane in the present embodiment 3 is 15mm, therefore, the degree of depth h with the above-mentioned 1/4 wavelength silencer blind hole that calculates is decomposed into h1=14mm and h2=5.8mm according to h=h1+h2; Namely the first blind hole depth is 14mm, and the second blind hole depth is 5.8mm, and the aperture is 3mm, and the centre-to-centre spacing between the first blind hole 4 and the second blind hole 5 is 5-10, and selecting this centre-to-centre spacing in the present embodiment is 7mm.
Suction rate test: shown in Fig. 3 and improved front flow rate pressure-efficiency curve with improving aft-fan, in Wind Volume zone (30L/s), the fan pressure with muffler diminishes, and efficient is also on a declining curve, when being mainly large because of air quantity, the effect of backflow is more obvious.From the data of experiment, electric efficiency drops to 55% from 56%, can think that therefore muffler structure is little on the fan performance impact.
The noise test, on the whole, Efficiency Decreasing 1% left and right before and after improving there is no variation.From the result of noise, frequency spectrum as shown in Figure 4,1 rank sound pressure level remains unchanged substantially, 2 rank, 3 rank sound pressure levels drop to respectively 5.9dBA and 18.2dBA, and the decline of overall noise 2dBA is in test process, reduce before ear-piercing high frequency sound improves, the sound quality improves.
Although top invention has been described in conjunction with figure; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention; in the situation that do not break away from aim of the present invention, can also make a lot of distortion, within these all belong to protection of the present invention.
Claims (4)
1. one kind can effectively be reduced the diffuser that the motor blade skims over noise, comprise dividing plate, the one side of described dividing plate is provided with the diffusion blade, all diffusion blades are radially uniform, form the Acoustic Wave Propagation runner between adjacent diffusion blade in twos, it is characterized in that, be provided with 1/4 wavelength silencer in each Acoustic Wave Propagation runner, described 1/4 wavelength silencer is made of the blind hole that is arranged on Acoustic Wave Propagation runner bottom surface, described blind hole axially vertical with the Acoustic Wave Propagation runner.
2. according to claim 1ly can effectively reduce the diffuser that the motor blade skims over noise, it is characterized in that, described 1/4 wavelength silencer comprises a blind hole, and the degree of depth of described blind hole is h, and its computing formula is as follows:
h＝1/4λ (1)
In formula (1), λ=c/f, λ is for being reduced in the wavelength of noise, and c is the velocity of sound of sound wave, and f is the sound wave respective frequencies, and its span is (500Hz＜f＜10000Hz).
3. according to claim 1ly can effectively reduce the diffuser that the motor blade skims over noise, it is characterized in that, the another side of described dividing plate is provided with guide vane, described 1/4 wavelength silencer comprises two blind holes, the degree of depth of each blind hole is less than the height of guide vane, the degree of depth sum of two blind holes is h, and its computing formula is as follows:
h＝1/4λ (1)
In formula (1), λ=c/f, λ is for being reduced in the wavelength of noise, and c is the velocity of sound of sound wave, and f is the sound wave respective frequencies, and its span is (500Hz＜f＜10000Hz).
4. according to claim 2 or 3 describedly can effectively reduce the diffuser that the motor blade skims over noise, it is characterized in that, the diameter of blind hole is 3-5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104311754A CN103169424A (en) | 2011-12-20 | 2011-12-20 | Diffuser capable of effectively reducing passing noise of vanes of motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104311754A CN103169424A (en) | 2011-12-20 | 2011-12-20 | Diffuser capable of effectively reducing passing noise of vanes of motor |
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| CN103169424A true CN103169424A (en) | 2013-06-26 |
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| CN2011104311754A Pending CN103169424A (en) | 2011-12-20 | 2011-12-20 | Diffuser capable of effectively reducing passing noise of vanes of motor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224269A (en) * | 2016-10-10 | 2016-12-14 | 东莞市大可智能科技有限公司 | A kind of novel pipeline blower fan and application thereof |
| CN108366704A (en) * | 2015-12-04 | 2018-08-03 | 伊莱克斯公司 | Vacuum cleaner |
| WO2018219666A1 (en) * | 2017-05-31 | 2018-12-06 | Alfred Kärcher SE & Co. KG | Cleaning appliance |
| CN110566512A (en) * | 2019-09-09 | 2019-12-13 | 浙江奥正机电技术有限公司 | diffuser with vanes |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0176004B1 (en) * | 1995-10-03 | 1999-02-01 | 가나이 쯔도무 | Electric cleaning apparatus |
| US20050023077A1 (en) * | 2003-07-28 | 2005-02-03 | Sishtla Vishnu M. | Muffler for noise reduction |
| CN101163890A (en) * | 2005-02-23 | 2008-04-16 | 康明斯涡轮增压技术有限公司 | Compressor |
| CN101725568A (en) * | 2009-11-20 | 2010-06-09 | 无锡杰尔压缩机有限公司 | Diffusion guide vane synchronous adjusting mechanism of high-speed centrifugal fan |
| CN201546788U (en) * | 2009-09-24 | 2010-08-11 | 天津永盛万达环境设备安装工程有限公司 | reactive muffler |
| JP4862608B2 (en) * | 2006-10-24 | 2012-01-25 | パナソニック株式会社 | Electric blower and electric vacuum cleaner using the same |
-
2011
- 2011-12-20 CN CN2011104311754A patent/CN103169424A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0176004B1 (en) * | 1995-10-03 | 1999-02-01 | 가나이 쯔도무 | Electric cleaning apparatus |
| US20050023077A1 (en) * | 2003-07-28 | 2005-02-03 | Sishtla Vishnu M. | Muffler for noise reduction |
| CN101163890A (en) * | 2005-02-23 | 2008-04-16 | 康明斯涡轮增压技术有限公司 | Compressor |
| JP4862608B2 (en) * | 2006-10-24 | 2012-01-25 | パナソニック株式会社 | Electric blower and electric vacuum cleaner using the same |
| CN201546788U (en) * | 2009-09-24 | 2010-08-11 | 天津永盛万达环境设备安装工程有限公司 | reactive muffler |
| CN101725568A (en) * | 2009-11-20 | 2010-06-09 | 无锡杰尔压缩机有限公司 | Diffusion guide vane synchronous adjusting mechanism of high-speed centrifugal fan |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108366704A (en) * | 2015-12-04 | 2018-08-03 | 伊莱克斯公司 | Vacuum cleaner |
| CN106224269A (en) * | 2016-10-10 | 2016-12-14 | 东莞市大可智能科技有限公司 | A kind of novel pipeline blower fan and application thereof |
| WO2018219666A1 (en) * | 2017-05-31 | 2018-12-06 | Alfred Kärcher SE & Co. KG | Cleaning appliance |
| CN110566512A (en) * | 2019-09-09 | 2019-12-13 | 浙江奥正机电技术有限公司 | diffuser with vanes |
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Application publication date: 20130626 |