CN103557184A - Diffuser and motor used for centrifugal ventilation equipment - Google Patents
Diffuser and motor used for centrifugal ventilation equipment Download PDFInfo
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- CN103557184A CN103557184A CN201310503840.5A CN201310503840A CN103557184A CN 103557184 A CN103557184 A CN 103557184A CN 201310503840 A CN201310503840 A CN 201310503840A CN 103557184 A CN103557184 A CN 103557184A
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Abstract
The invention relates to the technical field of centrifugal ventilation equipment, and particularly to a diffuser used for the centrifugal ventilation equipment. The diffuser used for the centrifugal ventilation equipment comprises a diffuser main body, wherein multiple flow guide vanes are arranged on the upper end face of the diffuser main body; a circumferential locating ring is connected to the periphery of the diffuser main body in a sleeved manner; a gap exists between the circumferential locating ring and the diffuser main body; a noise reduction groove is formed in the outer sidewall of the gap; the noise reduction groove extends from the upper end face of the circumferential locating ring to the lower end face of the circumferential locating ring, and has the depth of quarter-wavelength of the noise which needs noise reduction. The invention also provides a motor which comprises an impeller outer cover and the diffuser, wherein the outer sidewall of the circumferential locating ring in the diffuser is attached to the inner sidewall of the impeller outer cover; the noise reduction groove in the diffuser and the inner sidewall of the impeller outer cover form a noise reduction cavity with an opening in the upper end. According to the quarter-wavelength pipe noise reduction principle, the purpose of reducing impeller passing frequency discrete noise in aerodynamic noise of a traditional centrifugal ventilator is realized.
Description
Technical field
The present invention relates to centrifugal ventilation equipment technical field, particularly a kind of Diffuser for centrifugal ventilation equipment and motor.
Background technique
The part of general existing centrifugal ventilation motor (motor of dust collector) mainly contains impeller outer cover, impeller, Diffuser, bearing bracket stand, stator, rotor, motor housing etc.High-revolving centrifugal ventilation motor noise is very large, and generally at 95dB, noise is one of vacuum cleaner problem demanding prompt solution always; Its noise is mainly divided into aerodynamic noise, mechanical noise and electromagnetic noise; And centrifugal blower is much larger compared with electromagnetic noise, mechanical noise because of the aerodynamic noise that vane rotary produces, it is its main noise.Guaranteeing under identical output power, the aerodynamic noise of wanting to reduce centrifugal blower conventionally can be very difficult, and the noise reduction measure of taking can cause the decline of fan efficiency conventionally.
The aerodynamic noise of centrifugal blower can be divided into impeller by frequency-distributed noise (being BPF) and broadband noise.Discrete noise shows higher peak value on noise pattern, sounds very sharp-pointed, maximum to the contribution of overall noise.
The Diffuser of centrifugal ventilation motor mainly contains vane diffuser and vaneless diffuser.Vane diffuser is to utilize blade to form the diffusion runner that certain cross section expands gradually, and it can play good diffusion effect, and centrifugal blower is greatly improved in the efficiency of operation point.But also because the existence of diffusion blade can produce larger discrete aerodynamic noise; Vaneless diffuser does not have blade exactly and forms by other means diffusion runner, and its aerodynamic noise is mainly broadband noise, there will not be obvious discrete frequency noise, but its diffusion effect is conventionally poor, and centrifugal blower is lower in the efficiency of operation point.
Centrifugal blower, in order to guarantee that fluid is according to certain flow passage, can assemble and form certain pipeline.And aerodynamic noise also can be propagated according to this runner after producing, can be by duct acoustics analysis.Duct noise can carry out noise reduction with various impedance type bafflers conventionally, to reach the object of noise reduction.But traditional centrifugal blower, because of structure or space size restriction, makes impedance type baffler be difficult for arranging.
Summary of the invention
Not enough for prior art, the present invention proposes a kind of Diffuser for centrifugal ventilation equipment, itself and impeller outer cover are used in conjunction with, and utilize the principle of pipeline silencing, are intended to solve how to reduce in traditional centrifugal blower aerodynamic noise impeller by the problem of frequency-distributed noise.
The technological scheme that the present invention proposes is:
A kind of Diffuser for centrifugal ventilation equipment, comprise Diffuser body, described Diffuser body upper-end surface is provided with several guide vanes, described Diffuser body periphery is socketed with circumferential positioning ring, described circumferential positioning ring and described Diffuser body have gap, its outer side wall is provided with silencing groove, and described silencing groove extends the lower end surface to described circumferential positioning ring from the upper-end surface of described circumferential positioning ring, and its degree of depth is 1/4th to need the wavelength of noise reduction noise.
Further, between adjacent described guide vane, form guiding gutter, described silencing groove is located at the outer side wall of described circumferential positioning ring and is positioned at described guiding gutter outlet port.
Further, described silencing groove is around the outer wall of described circumferential positioning ring.
Further, between described circumferential positioning ring and described guide vane, be provided with flow-stopping plate, described flow-stopping plate one end is connected in the end of described guide plate, and the other end is connected in the madial wall of described circumferential positioning ring.
Further, described Diffuser body lower end surface is provided with the bearing support of spring bearing.
Further, described silencing groove cross section is rectangular, its width >=1mm.
Further, described gap forms the sprue of Diffuser body lower end surface described in the direction of flow of described Diffuser body upper-end surface, the fluid of described Diffuser body upper-end surface flows into described silencing groove and forms collateral branch's runner, and described collateral branch runner and described sprue are parallel to each other.
Further, described silencing groove notch place is provided with breach, and described breach is the height lower than described guide vane upper-end surface at the height of vertical direction.
According to above-mentioned technological scheme, Diffuser beneficial effect of the present invention: increase circumferential positioning ring, Diffuser body is placed in circumferential positioning ring, Diffuser body and impeller outer cover are used in conjunction with, circumferentially the outer side wall of positioning ring is close to the madial wall of impeller outer cover, because the circumferential outer side wall of positioning ring is provided with silencing groove, its degree of depth is 1/4th to need the wavelength of noise reduction noise, the madial wall of silencing groove and impeller outer cover forms the noise reduction cavity volume of upper end open, according to quarter-wave long tube noise reduction principle, thereby reach, reduce in traditional centrifugal blower aerodynamic noise impeller by the object of frequency-distributed noise.In addition, circumferential positioning ring is fused in Diffuser body structure, does not increase original Diffuser body structure space, and on complete machine aeroperformance, efficiency all without impact.
The present invention also proposes a kind of motor, comprise impeller outer cover and Diffuser described above, the outer side wall of the described circumferential positioning ring in described Diffuser fits in the madial wall of described impeller outer cover, and the madial wall of silencing groove described in described Diffuser and described impeller outer cover forms the noise reduction cavity volume of upper end open.
According to above-mentioned technological scheme, motor beneficial effect of the present invention: circumferentially positioning ring coordinates with impeller outer cover, circumferentially the silencing groove of positioning ring and the madial wall of impeller outer cover form the noise reduction cavity volume of upper end open, according to quarter-wave long tube noise reduction principle, reduce impeller in traditional centrifugal blower aerodynamic noise and pass through frequency-distributed noise.
Accompanying drawing explanation
Fig. 1 is the stereogram in the Diffuser front that provides of the embodiment of the present invention;
Fig. 2 is the sectional view of the motor that provides of the embodiment of the present invention;
Fig. 3 is the partial enlarged drawing at A place in Fig. 2;
Fig. 4 is the stereogram of the Diffuser reverse side that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Fig. 1～4, it is a preferred embodiment provided by the invention.
As shown in Figure 1, the embodiment of the present invention proposes a kind of Diffuser 100 for centrifugal ventilation equipment, comprise Diffuser body 1, Diffuser body 1 upper-end surface is provided with several guide vanes 11, Diffuser body 1 periphery is socketed with circumferential positioning ring 2, and circumferentially positioning ring 2 has gap 3 with Diffuser body 1, and its outer side wall is provided with silencing groove 21, silencing groove 21 extends the lower end surface to circumferential positioning ring 2 from the upper-end surface of circumferential positioning ring 2, and its degree of depth is 1/4th to need the wavelength of noise reduction noise.
With reference to Fig. 2, shown in Fig. 1, Diffuser 100 is used in conjunction with impeller outer cover 4, in Diffuser 100, the outer side wall of circumferential positioning ring 2 is close to the madial wall of impeller outer cover 4, circumferentially the madial wall of the silencing groove 21 in positioning ring 2 and impeller outer cover 4 forms the noise reduction cavity volume 5 of upper end open, according to quarter-wave long tube noise reduction principle, thereby reach, reduce in traditional centrifugal blower aerodynamic noise impeller by the object of frequency-distributed noise.In addition, circumferential positioning ring 2 is fused in Diffuser body 1 structure, does not increase original Diffuser body 1 structure space, and on complete machine aeroperformance, efficiency all without impact.
In the invention process, on Diffuser body 1, increased circumferential positioning ring 2, circumferentially in positioning ring 2, be connected with Diffuser body 1, in traditional centrifugal blower, Diffuser and impeller outer cover just have space, for this reason, circumferentially positioning ring 2 can not increase Diffuser body 1 required structure space when assembling.
Pipeline silencing has resistive baffler, anti-formula baffler and mixes baffler.Anti-formula baffler generally includes Hull nurse hereby baffler and quarter-wave long tube.Hull nurse hereby baffler is commonly used to eliminate low-frequency noise, and quarter wavelength is effective, eliminates the noise that frequency ratio is higher.Because impeller is higher by frequency BPF, therefore select the noise reduction of quarter-wave long tube.This kind of baffler Zhi Xushi main line collateral branch, its pipe range is required to be 1/4th of institute's noise reduction frequency wavelength.Quarter wavelength hush pipe is mounted in the pipe of a sealing on main pipeline, when sound wave passes to after the anti-formula baffler of collateral branch, part incoming wave is reflected back toward supervisor and forms reflected wave, part incoming wave continues to propagate and form transmitted wave supervisor, and some sound wave enters collateral branch's baffler.In baffler, when running into border, the sound wave that enters to shine a part of wave reflection can be returned to baffler.At supervisor and baffler jointing, the reflective sound wave of some frequency and supervisor's incident acoustic wave single spin-echo in baffler, two ripples are cancelled out each other and are formed the node of an acoustic pressure or the amplitude of incoming wave is reduced, thereby play the object of noise reduction.
The degree of depth h formula of silencing groove 21 is: h=1/4 λ.In above-mentioned formula, λ=c/f, λ is the wavelength that will reduce noise, the velocity of sound that c is sound wave, f is noise reduction frequency.On Diffuser 100, silencing groove 21 degree of depth h determine according to the frequency of wanted noise reduction, in the embodiment of the present invention, the maximum composition noise reduction of 21 pairs of noises of silencing groove, i.e. blade passing frequency BPF, because single order BPF frequency is 6200Hz left and right, therefore can calculate the degree of depth h of silencing groove 21, be 13.5mm.
In the embodiment of the present invention, the quantity of silencing groove 21 is 14.
As shown in table 1, adopt 14 silencing grooves 21 and the electromechanical testing noise contrast that there is no silencing groove 21.
Table 1
| ? | Rotating speed fundamental frequency | 1BPF（dB） | 6300Hz CF center frequency (third-octave) | SPL（dB） |
| There is no silencing groove | 573.4Hz | 83.5 | 89.6 | 93.3 |
| 14 silencing grooves | 568.8Hz | 75.4 | 85.5 | 92.1 |
Third-octave in above-mentioned table 1, the frequency band range of 6300Hz CF center frequency is 5620Hz～7080Hz; As shown in Table 1, the 1BPF of the noise maximum 8.1dB that declined, the overall noise 1.2dB that declined.
With reference to Fig. 1, shown in Fig. 2, between adjacent guide vane 11, form guiding gutter 111, silencing groove 21 is located at the outer side wall of circumferential positioning ring 2 and is positioned at guiding gutter 111 outlet ports.When motor 200 work, impeller is with electric machine main shaft High Rotation Speed, fluid in impeller is thrown toward Diffuser 100 under the effect of centrifugal force, guiding gutter 111 in Diffuser body 1 is the mobile passages of fluid, and fluid is flowed through after Diffuser, speed declines, and kinetic energy is converted to static energy, and last fluid flows out through motor housing 6.
The aerodynamic noise of centrifugal blower mainly produces at impeller and impeller outlet place, and its aerodynamic noise source is mainly distributed on the interface of impeller and guiding gutter 111.Silencing groove 21 is arranged on circumferential positioning ring 2 and is positioned at guiding gutter 111 outlet ports, both can so that silencing groove 21 from aerodynamic noise source close to, play good erasure effect, can not affect again the diffusion effect of guiding gutter 111, can not have influence on performance.
As shown in Figure 1, silencing groove 21 is around the outer wall of circumferential positioning ring 2.Silencing groove 21 is arranged on circumferential positioning ring 2, and silencing groove 21, around the outer wall of circumferential positioning ring 2, just in time, for being positioned at the exit position of guiding gutter 111, makes each guiding gutter 111 outlet port all have at least 1 silencing groove 21.
As shown in Figure 1, circumferentially between positioning ring 2 and guide vane 11, be provided with flow-stopping plate 22, flow-stopping plate 22 one end are connected in the end of guide vane 11, and the other end is connected in the madial wall of circumferential positioning ring 2.Circumferentially positioning ring 2 is fixedly connected on guide vane 11 by flow-stopping plate 22, thereby be fixed on Diffuser body 1 periphery, guide vane 11 has also increased the intensity of guide vane 11, and has reduced eddy region, thereby reduce eddy current amount, reduced to a certain extent noise.
As shown in Figure 2 and Figure 4, Diffuser body 1 lower end surface is provided with the bearing support 12 of spring bearing 7.In Diffuser body 1 periphery, increase circumferential positioning ring 2: and bearing support 12 is located on Diffuser body 1, circumferentially positioning ring 2 directly coordinates realization axially and radial location with motor housing 6, so just can omit traditional bearing bracket stand, reduced the integrating error that coordinate, positioning precision is higher than adopting bearing bracket stand.Remove traditional bearing bracket stand, shortened motor 200 axial spaces, reduce number of spare parts, reduce costs.
Certainly, silencing groove 21 notch cross sections can be also other sizes, as 3mmX6mm, 3mmX3mm.
With reference to Fig. 3, shown in Fig. 1, gap 3 forms the sprue 31 of direction of flow Diffuser body 1 lower end surface of Diffuser body 1 upper-end surface, and the fluid of Diffuser body 1 upper-end surface flows into the silencing groove 21 formation runner 5a of runner 5a， collateral branch of collateral branch and sprue 31 is parallel to each other.Namely circumferentially the silencing groove 21 in positioning ring 2 and the madial wall of impeller outer cover 4 form the noise reduction cavity volume 5 of upper end open to the runner 5a of collateral branch; The pipeline of fluid and Acoustic Wave Propagation as shown by arrows in Figure 3, the quarter-wave runner 5a of collateral branch that circumferentially positioning ring 2 forms after assembling with impeller outer cover 4, with respect to sprue 31, for a runner 5a of branch line ，Qie Gai collateral branch of sprue 31 is blind hole.The runner 5a of sound wave Ci collateral branch blind hole end forms after reflected wave, at the intersection of sprue 31 and the sound wave interference in sprue 31.The quarter-wave runner 5a of collateral branch, makes the incoming wave of reflective sound wave and sprue 31 at intersection's single spin-echo, can reduce the amplitude of noise reduction frequency.
As shown in Figure 1, silencing groove 21 notch places are provided with breach 212, and breach 212 is the height lower than guide vane 11 upper-end surfaces at the height of vertical direction.Between adjacent guide vane 11, form guiding gutter 111, the height of breach 212 is the height lower than guide vane 11 upper-end surfaces at vertical direction, is convenient to sound wave in guiding gutter 111 and enters in silencing groove 21 by breach 212.
With reference to Fig. 2, shown in Fig. 1, the embodiment of the present invention also proposes a kind of motor 200, comprise impeller outer cover 4 and above-mentioned Diffuser 100, the outer side wall of the circumferential positioning ring 2 in Diffuser 100 fits in the madial wall of impeller outer cover 4, and in Diffuser 100, the madial wall of silencing groove 21 and impeller outer cover 4 forms the noise reduction cavity volume 5 of upper end open.
Diffuser 100 is used in conjunction with impeller outer cover 4, in Diffuser 100, the outer side wall of circumferential positioning ring 2 is close to the madial wall of impeller outer cover 4, circumferentially the madial wall of the silencing groove 21 in positioning ring 2 and impeller outer cover 4 forms the noise reduction cavity volume 5 of upper end open, according to quarter-wave long tube noise reduction principle, noise reduction cavity volume 5 reduces impeller in traditional centrifugal blower aerodynamic noise and passes through frequency-distributed noise.In addition, circumferential positioning ring 2 is fused in Diffuser body 1 structure, does not increase motor 200 structure spaces, and on complete machine aeroperformance, efficiency all without impact.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. the Diffuser for centrifugal ventilation equipment, comprise Diffuser body, described Diffuser body upper-end surface is provided with several guide vanes, it is characterized in that, described Diffuser body periphery is socketed with circumferential positioning ring, and described circumferential positioning ring and described Diffuser body have gap, and its outer side wall is provided with silencing groove, described silencing groove extends the lower end surface to described circumferential positioning ring from the upper-end surface of described circumferential positioning ring, and its degree of depth is 1/4th to need the wavelength of noise reduction noise.
2. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, is characterized in that, between adjacent described guide vane, forms guiding gutter, and described silencing groove is located at the outer side wall of described circumferential positioning ring and is positioned at described guiding gutter outlet port.
3. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 2, is characterized in that, described silencing groove is around the outer wall of described circumferential positioning ring.
4. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, it is characterized in that, between described circumferential positioning ring and described guide vane, be provided with flow-stopping plate, described flow-stopping plate one end is connected in the end of described guide plate, and the other end is connected in the madial wall of described circumferential positioning ring.
5. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, is characterized in that, described Diffuser body lower end surface is provided with the bearing support of spring bearing.
6. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, is characterized in that, described silencing groove cross section is rectangular, its width >=1mm.
7. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, it is characterized in that, described gap forms the sprue of Diffuser body lower end surface described in the direction of flow of described Diffuser body upper-end surface, the fluid of described Diffuser body upper-end surface flows into described silencing groove and forms collateral branch's runner, and described collateral branch runner and described sprue are parallel to each other.
8. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, is characterized in that, described silencing groove notch place is provided with breach, and described breach is the height lower than described guide vane upper-end surface at the height of vertical direction.
9. a motor, comprise impeller outer cover, it is characterized in that, also comprise the Diffuser as described in as arbitrary in claim 1 to 8, the outer side wall of the described circumferential positioning ring in described Diffuser fits in the madial wall of described impeller outer cover, and the madial wall of silencing groove described in described Diffuser and described impeller outer cover forms the noise reduction cavity volume of upper end open.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310503840.5A CN103557184B (en) | 2013-10-23 | 2013-10-23 | A kind of Diffuser for centrifugal ventilation equipment and motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310503840.5A CN103557184B (en) | 2013-10-23 | 2013-10-23 | A kind of Diffuser for centrifugal ventilation equipment and motor |
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| CN103557184A true CN103557184A (en) | 2014-02-05 |
| CN103557184B CN103557184B (en) | 2016-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317749A (en) * | 2014-07-18 | 2016-02-10 | 台达电子工业股份有限公司 | Fan assembly and fan frame thereof |
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| JPS59170495A (en) * | 1983-03-18 | 1984-09-26 | Matsushita Electric Ind Co Ltd | Motor fan |
| US5110266A (en) * | 1989-03-01 | 1992-05-05 | Hitachi, Ltd. | Electric blower having improved return passage for discharged air flow |
| JPH06101698A (en) * | 1992-08-20 | 1994-04-12 | Hitachi Ltd | Device for reducing noise of centrifugal compressor |
| CN102518605A (en) * | 2005-02-23 | 2012-06-27 | 康明斯涡轮增压技术有限公司 | Compressor |
| JP2012132317A (en) * | 2010-12-20 | 2012-07-12 | Hitachi Appliances Inc | Electric blower and vacuum cleaner with the same |
| CN102810933A (en) * | 2011-06-03 | 2012-12-05 | 乐金电子(天津)电器有限公司 | Muffler, motor casing and dust collector with motor casing |
| CN203146424U (en) * | 2013-01-22 | 2013-08-21 | 捷和电机（深圳）有限公司 | Air guiding device and electric motor for centrifugal ventilating device |
| CN203570691U (en) * | 2013-10-23 | 2014-04-30 | 捷和电机制品(深圳)有限公司 | Diffuser for centrifugal ventilators and motor |
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2013
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59170495A (en) * | 1983-03-18 | 1984-09-26 | Matsushita Electric Ind Co Ltd | Motor fan |
| US5110266A (en) * | 1989-03-01 | 1992-05-05 | Hitachi, Ltd. | Electric blower having improved return passage for discharged air flow |
| JPH06101698A (en) * | 1992-08-20 | 1994-04-12 | Hitachi Ltd | Device for reducing noise of centrifugal compressor |
| CN102518605A (en) * | 2005-02-23 | 2012-06-27 | 康明斯涡轮增压技术有限公司 | Compressor |
| JP2012132317A (en) * | 2010-12-20 | 2012-07-12 | Hitachi Appliances Inc | Electric blower and vacuum cleaner with the same |
| CN102810933A (en) * | 2011-06-03 | 2012-12-05 | 乐金电子(天津)电器有限公司 | Muffler, motor casing and dust collector with motor casing |
| CN203146424U (en) * | 2013-01-22 | 2013-08-21 | 捷和电机（深圳）有限公司 | Air guiding device and electric motor for centrifugal ventilating device |
| CN203570691U (en) * | 2013-10-23 | 2014-04-30 | 捷和电机制品(深圳)有限公司 | Diffuser for centrifugal ventilators and motor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317749A (en) * | 2014-07-18 | 2016-02-10 | 台达电子工业股份有限公司 | Fan assembly and fan frame thereof |
| CN105317749B (en) * | 2014-07-18 | 2018-05-08 | 台达电子工业股份有限公司 | Fan component and its fan frame |
| US9970443B2 (en) | 2014-07-18 | 2018-05-15 | Delta Electronics, Inc. | Fan frame and fan assembly with silencing structures |
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| CN103557184B (en) | 2016-04-06 |
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