CN103557184B - A kind of Diffuser for centrifugal ventilation equipment and motor - Google Patents
A kind of Diffuser for centrifugal ventilation equipment and motor Download PDFInfo
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- CN103557184B CN103557184B CN201310503840.5A CN201310503840A CN103557184B CN 103557184 B CN103557184 B CN 103557184B CN 201310503840 A CN201310503840 A CN 201310503840A CN 103557184 B CN103557184 B CN 103557184B
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- positioning ring
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Abstract
The present invention relates to centrifugal ventilation equipment technical field, particularly a kind of Diffuser for centrifugal ventilation equipment; Comprise Diffuser body, Diffuser body upper-end surface is provided with several guide vane, Diffuser body peripheral is socketed with circumferential positioning ring, circumference positioning ring and Diffuser body have gap, its outer side wall is provided with silencing groove, the lower end surface of silencing groove from the upper-end surface of circumferential positioning ring to circumferential positioning ring extends, and its degree of depth is 1/4th wavelength needing noise reduction noise; The present invention also proposes a kind of motor, and comprise impeller outer cover and Diffuser described above, in Diffuser, the outer side wall of circumferential positioning ring fits in the madial wall of impeller outer cover, and in Diffuser, 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, thus reach and to reduce in conventional centrifugal ventilating machine pneumatic noise impeller by the object of frequency-distributed noise.
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 the aerodynamic noise that centrifugal blower produces because of vane rotary is much larger compared with electromagnetic noise, mechanical noise, it is its main noise.Ensureing under identical output power, want that the aerodynamic noise reducing centrifugal blower usually can be very difficult, and the noise reduction measure taked can cause the decline of fan efficiency usually.
The aerodynamic noise of centrifugal blower can be divided into impeller by frequency-distributed noise (i.e. 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 the diffusion runner utilizing blade to form certain cross section to expand 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, larger discrete aerodynamic noise can be produced; Vaneless diffuser does not have blade exactly and forms diffusion runner by other means, its aerodynamic noise mainly broadband noise, namely there will not be obvious tonal noise frequency, but its diffusion effect is usually poor, and centrifugal blower is lower in the efficiency of operation point.
Centrifugal blower, in order to ensure 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, namely can by duct acoustics analysis.Duct noise can use various impedance type baffler to carry out noise reduction usually, to reach the object of noise reduction.But conventional centrifugal ventilator, because of structure or space size restriction, makes impedance type baffler not easily arrange.
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 with the use of, utilize the principle of pipeline silencing, be intended to solve how to reduce in conventional centrifugal ventilating machine pneumatic 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 vane, described Diffuser body peripheral 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 the lower end surface of described silencing groove from the upper-end surface of described circumferential positioning ring to described circumferential positioning ring extends, and its degree of depth is 1/4th wavelength needing noise reduction noise.
Further, form guiding gutter between adjacent described guide vane, 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, be provided with flow-stopping plate between described circumferential positioning ring and described guide vane, described flow-stopping plate one end is connected to the end of described guide plate, and the other end is connected to 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, the sprue of Diffuser body lower end surface described in the direction of flow that described gap forms 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, described breach at the height of vertical direction lower than the height of described guide vane upper-end surface.
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 with the use of, the outer side wall of circumference positioning ring is close to the madial wall of impeller outer cover, because the outer side wall of circumferential positioning ring is provided with silencing groove, its degree of depth is 1/4th wavelength needing 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, thus reach and to reduce in conventional centrifugal ventilating machine pneumatic 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 described in described Diffuser, the madial wall of silencing groove 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: circumferential positioning ring coordinates with impeller outer cover, the circumference 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 conventional centrifugal ventilating machine pneumatic noise and pass through frequency-distributed noise.
Accompanying drawing explanation
Fig. 1 is the stereogram in the Diffuser front that the embodiment of the present invention provides;
Fig. 2 is the sectional view of the motor that the embodiment of the present invention provides;
Fig. 3 is the partial enlarged drawing at A place in Fig. 2;
Fig. 4 is the stereogram of the Diffuser reverse side that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearly understand, 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, be not intended to limit the present invention.
As shown in figures 1-4, be 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 vane 11, Diffuser body 1 periphery is socketed with circumferential positioning ring 2, and circumferential positioning ring 2 has gap 3 with Diffuser body 1, and its outer side wall is provided with silencing groove 21, the lower end surface of silencing groove 21 from the upper-end surface of circumferential positioning ring 2 to circumferential positioning ring 2 extends, and its degree of depth is 1/4th wavelength needing noise reduction noise.
With reference to Fig. 2, shown in composition graphs 1, Diffuser 100 and impeller outer cover 4 with the use of, in Diffuser 100, the outer side wall of circumferential positioning ring 2 is close to the madial wall of impeller outer cover 4, silencing groove 21 in circumference positioning ring 2 and the madial wall of impeller outer cover 4 form the noise reduction cavity volume 5 of upper end open, according to quarter-wave long tube noise reduction principle, thus reach and to reduce in conventional centrifugal ventilating machine pneumatic 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.
On Diffuser body 1, circumferential positioning ring 2 is added in the invention process, Diffuser body 1 is connected with in circumference positioning ring 2, in conventional centrifugal ventilator, Diffuser and impeller outer cover just have space, for this reason, circumferential positioning ring 2 can not increase Diffuser body 1 structure space required 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 higher noise of frequency.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 closed pipe of on main pipeline one, after sound wave passes to 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 supervisor to form transmitted wave, and some sound wave enters collateral branch's baffler.In baffler, when the sound wave entering to shine runs into border, a part of wave reflection can be returned baffler.At supervisor and baffler jointing, the reflective sound wave of some frequency is contrary with the incident acoustic wave phase place of supervisor in baffler, two ripples cancel out each other a formation acoustic pressure node or the amplitude of incoming wave is reduced, thus 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 are for reducing the wavelength of noise, and c is the velocity of sound of sound wave, and f is noise reduction frequency.On Diffuser 100, silencing groove 21 degree of depth h determines according to the frequency of wanted noise reduction, in the embodiment of the present invention, the maximum composition noise reduction of silencing groove 21 pairs of noises, i.e. blade passing frequency BPF, because single order BPF frequency is about 6200Hz, therefore the degree of depth h that can calculate silencing groove 21 is 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 vs not having 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 maximum 1BPF of noise have dropped 8.1dB, and overall noise have dropped 1.2dB.
With reference to Fig. 1, shown in composition graphs 2, form guiding gutter 111 between adjacent guide vanes 11, silencing groove 21 is located at the outer side wall of circumferential positioning ring 2 and is positioned at guiding gutter 111 outlet port.When motor 200 works, impeller is with electric machine main shaft High Rotation Speed, fluid in impeller is thrown toward Diffuser 100 under the influence of centrifugal force, guiding gutter 111 in Diffuser body 1 is passages of fluid flowing, and after fluid flows through 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 to be arranged on circumferential positioning ring 2 and to be positioned at guiding gutter 111 outlet port, both can make silencing groove 21 close to aerodynamic noise source, play good erasure effect, the diffusion effect of guiding gutter 111 can not have been affected again, namely 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, namely makes each guiding gutter 111 outlet port all have at least 1 silencing groove 21.
As shown in Figure 1, be provided with flow-stopping plate 22 between circumferential positioning ring 2 and guide vane 11, flow-stopping plate 22 one end is connected to the end of guide vane 11, and the other end is connected to the madial wall of circumferential positioning ring 2.Circumference positioning ring 2 is fixedly connected on guide vane 11 by flow-stopping plate 22, thus being fixed on Diffuser body 1 periphery, guide vane 11 also add the intensity of guide vane 11, and decreases eddy region, thus reduce eddy current amount, decrease noise to a certain extent.
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.Circumferential positioning ring 2 is increased in Diffuser body 1 periphery: and bearing support 12 is located on Diffuser body 1, circumference positioning ring 2 direct cooperation with motor housing 6 realizes axis and radial location, so just can omit traditional bearing bracket stand, decrease the integrating error of cooperation, positioning precision is higher than employing bearing bracket stand.Remove traditional bearing bracket stand, shorten motor 200 axial space, reduce number of spare parts, reduce costs.
Silencing groove 21 cross section is rectangular, its width >=1mm.Silencing groove 21 notch sectional dimension can have a certain impact to erasure effect, and in the embodiment of the present invention, because of spatial constraints, silencing groove 21 notch sectional dimension is taken as 2mmX10mm.
Certainly, silencing groove 21 notch cross section can be also other sizes, as 3mmX6mm, 3mmX3mm.
With reference to Fig. 3, shown in composition graphs 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 silencing groove 21 and forms collateral branch runner 5a, and collateral branch runner 5a and sprue 31 are parallel to each other.Silencing groove 21 in collateral branch runner 5a i.e. circumferential positioning ring 2 and the madial wall of impeller outer cover 4 form the noise reduction cavity volume 5 of upper end open; The pipeline of fluid and Acoustic Wave Propagation as shown by arrows in Figure 3, circumference positioning ring 2 and impeller outer cover 4 assemble the quarter-wave collateral branch runner 5a of rear formation, relative to sprue 31, be a branch line of sprue 31, and this collateral branch runner 5a is blind hole.Sound wave is formed after reflected wave at this collateral branch runner 5a blind hole end, the sound wave interference in the intersection and sprue 31 of sprue 31.Quarter-wave collateral branch runner 5a, makes reflective sound wave contrary in intersection's phase place with the incoming wave of sprue 31, can reduce the amplitude of noise reduction frequency.
As shown in Figure 1, silencing groove 21 notch place is provided with breach 212, breach 212 at the height of vertical direction lower than the height of guide vane 11 upper-end surface.Form guiding gutter 111 between adjacent guide vanes 11, the height of breach 212, at the height of vertical direction lower than guide vane 11 upper-end surface, is convenient to sound wave in guiding gutter 111 and is entered in silencing groove 21 by breach 212.
With reference to Fig. 2, shown in composition graphs 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, silencing groove 21 and the madial wall of impeller outer cover 4 form the noise reduction cavity volume 5 of upper end open.
Diffuser 100 and impeller outer cover 4 with the use of, in Diffuser 100, the outer side wall of circumferential positioning ring 2 is close to the madial wall of impeller outer cover 4, silencing groove 21 in circumference positioning ring 2 and the madial wall of impeller outer cover 4 form the noise reduction cavity volume 5 of upper end open, according to quarter-wave long tube noise reduction principle, noise reduction cavity volume 5 to reduce in conventional centrifugal ventilating machine pneumatic noise impeller by frequency-distributed noise.In addition, circumferential positioning ring 2 is fused in Diffuser body 1 structure, does not increase motor 200 structure space, 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 amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the Diffuser for centrifugal ventilation equipment, comprise Diffuser body, described Diffuser body upper-end surface is provided with several guide vane, it is characterized in that, described Diffuser body peripheral 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, the lower end surface of described silencing groove from the upper-end surface of described circumferential positioning ring to described circumferential positioning ring extends, and its degree of depth is 1/4th wavelength needing noise reduction noise; Form guiding gutter between adjacent described guide vane, described silencing groove is located at the outer side wall of described circumferential positioning ring and is positioned at described guiding gutter outlet port.
2. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, it is characterized in that, described silencing groove is around the outer wall of described circumferential positioning ring.
3. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, it is characterized in that, be provided with flow-stopping plate between described circumferential positioning ring and described guide vane, described flow-stopping plate one end is connected to the end of described guide vane, and the other end is connected to the madial 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, described Diffuser body lower end surface is provided with the bearing support of spring bearing.
5. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, it is characterized in that, described silencing groove cross section is rectangular, its width >=1mm.
6. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, it is characterized in that, the sprue of Diffuser body lower end surface described in the direction of flow that described gap forms 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.
7. a kind of Diffuser for centrifugal ventilation equipment as claimed in claim 1, it is characterized in that, described silencing groove notch place is provided with breach, described breach at the height of vertical direction lower than the height of described guide vane upper-end surface.
8. a motor, comprise impeller outer cover, it is characterized in that, also comprise as arbitrary in claim 1 to 7 as described in Diffuser, the outer side wall of the described circumferential positioning ring in described Diffuser fits in the madial wall of described impeller outer cover, and described in described Diffuser, the madial wall of silencing groove and described impeller outer cover forms the noise reduction cavity volume of upper end open.
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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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| 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 CN103557184A (en) | 2014-02-05 |
| CN103557184B true CN103557184B (en) | 2016-04-06 |
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| 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 |
Citations (8)
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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 |
-
2013
- 2013-10-23 CN CN201310503840.5A patent/CN103557184B/en active Active
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 |
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