CN1818395A - Impeller with staggered leaf on front edge - Google Patents
Impeller with staggered leaf on front edge Download PDFInfo
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- CN1818395A CN1818395A CN 200610024725 CN200610024725A CN1818395A CN 1818395 A CN1818395 A CN 1818395A CN 200610024725 CN200610024725 CN 200610024725 CN 200610024725 A CN200610024725 A CN 200610024725A CN 1818395 A CN1818395 A CN 1818395A
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- blade
- leading edge
- impeller
- front edge
- noise
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Abstract
The invention relates to a blade front edge misplaced impeller. First, suppose the number of the blades of the fan impeller to be even, and then mount the blades equidistantly around the circumference on the hub of the axial-flow fan or on the wheel disk of the centrifugal fan. The front edges of odd and even series blades are misplaced. If the distance between the front edge of the two series blades satisfies the condition of making the phase of two sound waves reverse or differ by half a wavelength, two sound waves with the same frequency and amplitude and reversal phases are constructed.
Description
Technical field
The present invention relates to a kind of impeller of staggered leaf on front edge, be specially adapted to various forms of blower fans, have good noise reduction.Belong to the fluid machinery technical field.
Background technique
Blower fan is the various lots of universal machine of a kind of use, can send bigger noise during owing to its work, can influence people's work and living environment, therefore reduces the noise of blower fan, the target that the person's of being to use hope, design and the producer pursue.Usually the method that reduces fan noise has initiatively and two kinds of methods of passive noise reduction, and active noise reduction is exactly the flowing of air-flow from improve blower fan, reduce air-flow pulsation, and the mechanism aspects such as bump of solid wall surface take measures; Passive noise reduction is exactly by adopting methods such as silencing apparatus or vibration damper to realize.When active noise reduction does not satisfy usage requirement, usually be aided with passive noise reduction.
In prior art, there is a kind of passive noise-reduction method to be called " sound wave interference method ", it makes a sound generator exactly, artificially produces a noise, and make that this man made noise is identical with the frequency of depositing noise, wave amplitude (acoustic pressure) is identical, phase place opposite (or phase difference of half wavelength).When man made noise takes place simultaneously with two sound waves of noise of having deposited, can interfere, its interference effect is exactly to make each wave amplitude (acoustic pressure) constantly of two sound waves produce stack.Because the frequency of these two sound waves is identical, wave amplitude (acoustic pressure) is identical, phase place opposite (or phase difference of half wavelength), the result of wave amplitude (acoustic pressure) stack just cancels out each other (being zero) in theory, thereby has reached the purpose of noise reduction.
There are two problems in " but sound wave interference method " when being used for the blower fan noise reduction:
1, because the frequency of the discrete noise that blower fan produces is relevant with the rotating speed of blower fan with wave amplitude (acoustic pressure), and the rotating speed of blower fan should change according to the needs of energy adjustment, so the frequency of the noise that blower fan produces and wave amplitude (acoustic pressure) can change when work.The sound wave that sound generator is produced has identical wave amplitude with fan noise, and this problem general solution is never good and acquire a certain degree of difficulty; Particularly, make the frequency and the wave amplitude (acoustic pressure) of the noise that frequency of sound wave that sound generator produces and wave amplitude (acoustic pressure) and blower fan produce carry out synchronous change, more difficult realization.
2, " sound wave interference method " must add a sound generator, usually makes working equipment or the system complex and hugeization of blower fan, and increased extraneous expense, improved gross investment.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of impeller of staggered leaf on front edge is provided,, do not increase again under the condition of extraneous expense, just can effectively reduce fan noise neither increasing equipment such as sound generator.
For realizing this purpose, the present invention organically combines the thought of " sound wave interference method " and the design of blower fan, the rotating speed of considering discrete noise that blower fan produces and blower fan is relevant with the number of blade, when air-flow when blade inlet edge stream comes, bump takes place and produces discrete noise in air-flow and blade, just can produce two sound waves if make air-flow and blade that twice bump take place, when identical with the number of blade of twice bump of air-flow, and control time of twice bump, make the opposite or phase difference of half wavelength of two sound wave phase places of generation, then the interference of two sound waves is cancelled each other the noise that sends, and reaches the purpose that reduces fan noise.
In technological scheme of the present invention, the number of blade of draught fan impeller is decided to be even number, blade is installed on the wheel hub of axial-flow blower equally spacedly along circumference, or be installed on the wheel disc of centrifugal blower, wherein, the leading edge of odd column blade and even column blade is misplaced, that is: the leading edge locus of the leading edge locus of odd column blade and even column blade is staggered front to back, and the distance between the leading edge of two row blades satisfies the condition of the opposite or phase difference of half wavelength of the phase place make two sound waves.Frequency is identical, wave amplitude (acoustic pressure) is identical, the sound wave of phase place opposite (or phase difference of half wavelength) so just to build two.
When air-flow when blade inlet edge stream comes, at first bump takes place and produces first sound wave with the first row blade inlet edge; Bump takes place and produces second sound wave with the secondary series blade inlet edge again in air-flow subsequently, because two row blade inlet edges satisfy the condition of the phase place opposite (or phase difference of half wavelength) that makes two sound waves, so two sound waves are cancelled each other, reach the purpose that reduces fan noise.
The blade wheel structure of staggered leaf on front edge of the present invention can also be used to pass through (horizontal stroke) flow fan and various water pump except can being used for axial-flow blower and centrifugal blower, can both play the effect of noise reduction.
The present invention is simple in structure, with low cost, the design that can be used for new blower fan makes it to reduce noise, also can transform original blower fan (having even leaves), can improve people's work and living environment more conveniently, have obvious social and economic benefit.
Description of drawings
Fig. 1 is the structural representation that axial flow fan vane wheel adopts staggered leaf on front edge.
1 is the odd column blade among Fig. 1,2 even column blades, and the 3rd, wheel hub, 4 is first leading edges, 5 is second leading edges.
Fig. 2 is the structural representation that centrifugal blower fan blade wheel adopts staggered leaf on front edge.
1 is the odd column blade among Fig. 2,2 even column blades, and 4 is first leading edges, 5 is second leading edges, the 6th, wheel disc.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described.
The impeller blade number of the present invention's design is an even number, the blade of impeller is divided into two row---odd column blade and even column blade, blade is installed on the wheel hub of axial-flow blower equally spacedly along circumference, or be installed on the wheel disc of centrifugal blower, wherein, the leading edge of odd column blade and even column blade is misplaced, that is: the leading edge locus of the leading edge locus of odd column blade and even column blade is staggered front to back, and the distance between the leading edge of two row blades satisfies the condition of the opposite or phase difference of half wavelength of the phase place make two sound waves.
Fig. 1 is the structural representation that axial flow fan vane wheel adopts staggered leaf on front edge.
As shown in Figure 1, the number of blade of axial flow fan vane wheel is an even number, blade is installed on the wheel hub 3 of axial-flow blower equally spacedly along circumference, wherein, the leading edge of odd column blade 1 is positioned at first leading edge, 4 positions on the wheel hub 3, the leading edge of even column blade 2 is positioned at the position of second leading edge 5 on the wheel hub 3, and the distance between first leading edge 4 and second leading edge 5 satisfies the condition of the opposite or phase difference of half wavelength of the phase place make two sound waves.
Fig. 2 is the structural representation that centrifugal blower fan blade wheel adopts staggered leaf on front edge.
As shown in Figure 2, the number of blade of centrifugal blower fan blade wheel is an even number, blade is installed on the wheel disc 6 of centrifugal blower equally spacedly along circumference, wherein, the leading edge of odd column blade 1 is positioned at first leading edge, 4 positions on the wheel disc 6, the leading edge of even column blade 2 is positioned at the position of second leading edge 5 on the wheel disc 6, and the distance between first leading edge 4 and second leading edge 5 satisfies the condition of the opposite or phase difference of half wavelength of the phase place make two sound waves.
When air-flow when blade inlet edge stream comes, at first bump takes place and produces first sound wave in the leading edge with the odd column blade 1 that is positioned at first leading edge 4, subsequently air-flow again and the leading edge that is positioned at the even column blade 2 of second leading edge 5 bump takes place and produce second sound wave, because the condition of the opposite or phase difference of half wavelength of the phase place that makes two sound waves is satisfied in the position at odd column blade 1 and even column blade 2 leading edge places, so two sound waves are cancelled each other, reach the purpose that reduces fan noise.
The blade wheel structure of staggered leaf on front edge of the present invention can also be used to pass through (horizontal stroke) flow fan and various water pump except can being used for axial-flow blower and centrifugal blower, can both play the effect of noise reduction.
Claims (1)
1, a kind of impeller of staggered leaf on front edge, comprise blade, wheel hub (3) or wheel disc (6), it is characterized in that the described number of blade is an even number, blade is installed on wheel hub (3) or the wheel disc (6) equally spacedly along circumference, wherein, the leading edge of odd column blade (1) and even column blade (2) is misplaced, be that the leading edge of odd column blade (1) is positioned at first leading edge (4) position on wheel hub (3) or the wheel disc (6), the leading edge of even column blade (2) is positioned at the position of second leading edge (5) on wheel hub (3) or the wheel disc (6), and the distance between first leading edge (4) and second leading edge (5) satisfies the condition of the opposite or phase difference of half wavelength of the phase place make two sound waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610024725XA CN100346078C (en) | 2006-03-16 | 2006-03-16 | Impeller with staggered leaf on front edge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610024725XA CN100346078C (en) | 2006-03-16 | 2006-03-16 | Impeller with staggered leaf on front edge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1818395A true CN1818395A (en) | 2006-08-16 |
| CN100346078C CN100346078C (en) | 2007-10-31 |
Family
ID=36918545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200610024725XA Expired - Fee Related CN100346078C (en) | 2006-03-16 | 2006-03-16 | Impeller with staggered leaf on front edge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100346078C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7724515B2 (en) * | 2007-04-17 | 2010-05-25 | Hitachi, Ltd. | Disk array apparatus |
| CN104564805A (en) * | 2013-10-29 | 2015-04-29 | 海尔集团公司 | Fan blade structure of centrifugal draught fan, centrifugal draught fan and embedded air conditioner inner unit |
| CN106678074A (en) * | 2017-02-22 | 2017-05-17 | 宁波高泰电器有限公司 | Fan blade and duct air feeding device applying same |
| CN108061059A (en) * | 2017-12-30 | 2018-05-22 | 广东美的厨房电器制造有限公司 | Fan and micro-wave oven |
| CN113457958A (en) * | 2021-07-12 | 2021-10-01 | 重庆建安仪器有限责任公司 | Pressure wave generating device based on fan |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017295A (en) * | 1983-07-08 | 1985-01-29 | Matsushita Electric Ind Co Ltd | Vane wheel of crossing current blower |
| US5342167A (en) * | 1992-10-09 | 1994-08-30 | Airflow Research And Manufacturing Corporation | Low noise fan |
| JPH08121390A (en) * | 1994-10-25 | 1996-05-14 | Ishikawajima Harima Heavy Ind Co Ltd | Compressor vane shape for high speed fluid |
| JPH11148497A (en) * | 1997-11-17 | 1999-06-02 | Hitachi Ltd | Moving blade of axial flow compressor |
| DE10054244C2 (en) * | 2000-11-02 | 2002-10-10 | Honda Motor Co Ltd | Turbine blade arrangement and turbine blade for an axial turbine |
| CN2566015Y (en) * | 2002-08-23 | 2003-08-13 | 王纯柱 | Low noise Roots blower |
| JP2005207235A (en) * | 2004-01-20 | 2005-08-04 | Matsushita Electric Ind Co Ltd | Electric blower and vacuum cleaner using the same |
| CN1587713A (en) * | 2004-10-13 | 2005-03-02 | 吴劲松 | Interference noise reducing type centrifugal fan and cross flow fan |
-
2006
- 2006-03-16 CN CNB200610024725XA patent/CN100346078C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7724515B2 (en) * | 2007-04-17 | 2010-05-25 | Hitachi, Ltd. | Disk array apparatus |
| CN104564805A (en) * | 2013-10-29 | 2015-04-29 | 海尔集团公司 | Fan blade structure of centrifugal draught fan, centrifugal draught fan and embedded air conditioner inner unit |
| CN106678074A (en) * | 2017-02-22 | 2017-05-17 | 宁波高泰电器有限公司 | Fan blade and duct air feeding device applying same |
| CN108061059A (en) * | 2017-12-30 | 2018-05-22 | 广东美的厨房电器制造有限公司 | Fan and micro-wave oven |
| CN108061059B (en) * | 2017-12-30 | 2024-04-30 | 广东美的厨房电器制造有限公司 | Fan and microwave oven |
| CN113457958A (en) * | 2021-07-12 | 2021-10-01 | 重庆建安仪器有限责任公司 | Pressure wave generating device based on fan |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100346078C (en) | 2007-10-31 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Zhejiang three billion electrical appliance Co. Ltd. Assignor: Shanghai Jiao Tong University Contract fulfillment period: 2008.1.6 to 2013.1.5 contract change Contract record no.: 2009330001088 Denomination of invention: Impeller with staggered leaf on front edge Granted publication date: 20071031 License type: Exclusive license Record date: 2009.5.20 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.1.6 TO 2013.1.5; CHANGE OF CONTRACT Name of requester: ZHE JIANG SAYI ELECTRIC CO.,LTD. Effective date: 20090520 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071031 Termination date: 20110316 |