CN110500320A - A kind of aerofoil fan - Google Patents
A kind of aerofoil fan Download PDFInfo
- Publication number
- CN110500320A CN110500320A CN201910774984.1A CN201910774984A CN110500320A CN 110500320 A CN110500320 A CN 110500320A CN 201910774984 A CN201910774984 A CN 201910774984A CN 110500320 A CN110500320 A CN 110500320A
- Authority
- CN
- China
- Prior art keywords
- excision
- blade
- molded line
- pieces
- aerofoil fan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
Abstract
A kind of aerofoil fan, including wheel hub and several pieces of blades for being set to wheel hub side, adjacent two pieces of interlobate placement angles are equal, and the excision molded line material different in isometrical blade outer rim excision weight is respectively adopted in every piece of blade, to realize that vane centroid angle is unequal；The quantity of the blade is the excision molded line of 3 pieces, every piece blades when being one, every piece of blade is respectively equipped with the first excision molded line, the second excision molded line and third excision molded line, the shape of first excision molded line, the second excision molded line and third excision molded line is not exactly the same, not isometrical at blade outer rim excision to realize.Not isometrical and mass center angle is unequal at axial fan blade outer rim excision of the invention, on the one hand, the phase difference for making two neighboring blade pat air is not identical, on the other hand, it can be reduced the fluctuation intensity that blade pats air at fundamental frequency, above-mentioned both sides superposition declines the sound pressure level of fan effectively, and sound quality is significantly improved.
Description
Technical field
The present invention relates to a kind of fan, in particular to a kind of aerofoil fan.
Background technique
As shown in Figure 4, Figure 5, the shape, weight of every piece of blade of aerofoil fan currently on the market are the same, therefore
The position of the mass center of every piece of blade is the same, thus every piece of vane centroid angle is all equal, the aerofoil fan of this structure
Each blade pat air fluctuation intensity it is identical, two neighboring blade is identical as the phase difference that air interacts, this
Sample fan, which quickly rotates, will make this excitation cycle particularly evident, and the relevant effect of this harmonic wave makes the pulsation at by frequency
Intensity is enhanced, therefore peak value occurs at fundamental frequency and harmonic value in its discrete noise spectrogram, so that the sound of aerofoil fan
It arbitrarily downgrades relatively high, noise is bigger.
Therefore, it is necessary to be further improved.
Summary of the invention
The purpose of the present invention is intended to provide the aerofoil fan that a kind of structure is simple, noise is small, sound quality is good, practical, with
Overcome shortcoming in the prior art.
It is adjacent including wheel hub and several pieces of blades for being set to wheel hub side by a kind of aerofoil fan that this purpose designs
Two pieces of interlobate placement angles are equal, it is characterised in that: every piece of blade is respectively adopted excision molded line and cuts in isometrical blade outer rim
Except the different material of weight, to realize that vane centroid angle is unequal.
The excision molded line of every piece of blade is one or more curve.
The quantity of the blade is 3~6 pieces.
The quantity of the blade is the excision molded line of 3 pieces, every piece blades when being one, and every piece of blade is respectively equipped with first and cuts
Except molded line, the second excision molded line and third cut off molded line, the shape of the first excision molded line, the second excision molded line and third excision molded line
Shape is not exactly the same, not isometrical at blade outer rim excision to realize.
Adjacent two pieces of interlobate placement angles are respectively a, b, c, a=b=c.
Mass center angle between adjacent two pieces of blades is respectively β 1, β 2, β 3,1 ≠ β of β, 2 ≠ β 3 or 2 ≠ β of β 1=β 3
Or β 1 ≠ β 2=β 3.
The plane projection external wrap angle of aerofoil fan is α2, the blade quantity of aerofoil fan is N, α2With the relational expression of N are as follows:
The centre of the wheel hub is equipped with round sleeve, is connected with reinforcing rib between axle sleeve and wheel hub wall.
Aerofoil fan of the invention is cut using excision molded line of different shapes in isometrical blade outer rim on every piece of blade
Except the different material of weight, so that not isometrical at blade outer rim excision and mass center angle is unequal, on the one hand, make two neighboring leaf
The phase difference that piece pats air is not identical, on the other hand, can be reduced the fluctuation intensity that blade pats air at fundamental frequency, and above-mentioned two
The superposition of aspect declines the sound pressure level of fan effectively, and sound quality is significantly improved.It is simple with structure, makes an uproar
The feature that sound is small, sound quality is good, practical.
Detailed description of the invention
Fig. 1 is the main view of one embodiment of the invention axis flow fan.
Fig. 2 and Fig. 3 is the overall structure diagram figure of one embodiment of the invention axis flow fan different direction.
Fig. 4 and Fig. 5 is the overall structure diagram of two kinds of conventional axial-flow fans.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and embodiments.
Referring to figures 1-3, this aerofoil fan, including wheel hub 1 and several pieces of blades 2 for being set to 1 side of wheel hub, adjacent two
Placement angle between block blade 2 is equal, and it is different in isometrical blade outer rim excision weight that excision molded line is respectively adopted in every piece of blade 2
Material (allows to have the weight of 2 excision material of N-1 blade identical, N is the number of blade, and following formula is described), to realize blade
2 mass center angles are unequal, and (mass center is the mass centre of object, and referring to is considered mass concentration in this imagination on material system
Point).
The excision molded line of every piece of blade 2 is one or more curve.
The quantity of blade 2 is 3~6 pieces.
The quantity of blade 2 is the excision molded line of 3 pieces, every piece blades 2 when being one, and every piece of blade 2 is respectively equipped with first and cuts
Except molded line X, the second excision molded line Y and third cut off molded line Z, the first excision molded line X, the second excision molded line Y and third excision type
The shape of line Z is not exactly the same, not isometrical at 2 outer rim excision of blade to realize, so that the position of 2 mass center of blade is different
Sample, to realize that 2 mass center angle of blade is unequal.
Placement angle between adjacent two pieces of blades 2 is respectively a, b, c, a=b=c；Mass center between adjacent two pieces of blades 2
Angle is respectively β 1, β 2, β 3,1 ≠ β of β, 2 ≠ β 3 or 2 ≠ β of β 1=β 3 or β 1 ≠ β 2=β 3.
The centre of wheel hub 1 is equipped with round sleeve 1.1, is connected with reinforcing rib 1.2 between 1 inner wall of axle sleeve 1.1 and wheel hub.
Vane centroid Unequal distance angle of the invention needs to meet following relationship:
In formula, N is the number of blade；βjFor vane centroid angle.The purpose for meeting above formula formula is: the matter of entire aerofoil fan
The heart reaches dynamic equilibrium state when on rotation axis, and along with the placement angle between adjacent two pieces of blades 2 is equal, the purpose is to protect
Demonstrate,proving fan will not be because vibrating aggravation when Unequal distance operates blower, and the aeroperformance of fan will not be excessively influenced because of Unequal distance.
Start to cut off point O (referring to Fig. 1 and Fig. 4) of the excision molded line of this aerofoil fan needs to meet following range:
α2/2-10°≤α≤α2/2+10°
As shown in figure 4, the plane projection outer wrap angle α of conventional axial-flow fan (isometrical blade)2It needs to meet following relationship:
When plane projection outer wrap angle α2When size meets above-mentioned relation formula, the aeroperformance of fan is more excellent, and sound pressure level is lower,
Spectrum peak is lower, i.e., under air quantity, when plane projection outer wrap angle α2When size meets above-mentioned relation formula, the noise of aerofoil fan
Value is lower, and sound quality is more excellent.
The working principle of aerofoil fan:
For equidistant fan, the fluctuation intensity that each blade 2 pats air is identical, two neighboring blade 2 and air phase
The phase difference of interaction is 2 π/N, and fan, which quickly rotates, will make this excitation cycle particularly evident, the relevant work of this harmonic wave
There is peak at fundamental frequency and harmonic value with enhancing the fluctuation intensity at by frequency, therefore in its discrete noise spectrogram
Value.The expression formula of Rotation Noise fundamental frequency:
For Unequal distance fan, βjFor stochastic variable, and the β between adjacent blades 2jAngle is not generally identical.Due to differ
β away from fanjValue randomly selects, and therefore, the frequency that the blade 2 of Unequal distance fan pats air is not identical, the gas of generation
Body pressure fluctuation is also different, and the phase difference that two neighboring blade 2 pats air is not also identical.In spectrum curve characteristic, differ
Peak value away from fan at f1 shows as being weakened into the lesser Distribution value of numerical value at fundamental frequency and its frequency multiplication, and Unequal distance wind
The overall sound pressure level performance of fan is also decreased obviously.
The unequal 2 mass center angle of blade of this aerofoil fan is realized by 2 outer rim of blade not isometrical (diameter etc.)
, on the one hand, the phase difference for making two neighboring blade 2 pat air is not identical, on the other hand, can be reduced blade 2 at fundamental frequency
The fluctuation intensity of air is patted, above-mentioned both sides superposition declines the sound pressure level of fan effectively, and sound quality obtains bright
Aobvious improvement.
Above-mentioned is preferred embodiment of the invention, and basic principles and main features and the present invention of the invention have been shown and described
The advantages of.Those skilled in the art should be recognized that the present invention is not limited to the above embodiments, above embodiments and description
Described in merely illustrate the principles of the invention, without departing from the spirit and scope of the present invention the present invention also have it is various
Changes and improvements, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by institute
Attached the spirit and scope of the invention define.
Claims (8)
1. a kind of aerofoil fan, including wheel hub (1) and it is set to several pieces of blades (2) of wheel hub (1) side, adjacent two pieces of blades
(2) the placement angle between is equal, it is characterised in that: every piece of blade (2) is respectively adopted excision molded line and cuts off in isometrical blade outer rim
The different material of weight, to realize that blade (2) mass center angle is unequal.
2. aerofoil fan according to claim 1, it is characterised in that: the excision molded line of every piece of blade (2) be one or
A plurality of curve.
3. aerofoil fan according to claim 2, it is characterised in that: the quantity of the blade (2) is 3~6 pieces.
4. aerofoil fan according to claim 3, it is characterised in that: the quantity of the blade (2) is 3 pieces, every piece of blade (2)
Excision molded line be one when, every piece of blade (2) be respectively equipped with the first excision molded line (X), second excision molded line (Y) and third cut
Except molded line (Z), the shape of the first excision molded line (X), the second excision molded line (Y) and third excision molded line (Z) is not exactly the same, with
It realizes not isometrical at blade (2) outer rim excision.
5. aerofoil fan according to claim 4, it is characterised in that: the placement angle point between adjacent two pieces of blades (2)
Not Wei a, b, c, a=b=c.
6. aerofoil fan according to claim 4, it is characterised in that: the mass center angle between adjacent two pieces of blades (2)
Respectively β 1, β 2, β 3,1 ≠ β of β, 2 ≠ β 3 or 2 ≠ β of β 1=β 3 or β 1 ≠ β 2=β 3.
7. aerofoil fan according to claim 1, it is characterised in that: the plane projection external wrap angle of aerofoil fan is α2, axis stream wind
Blade (2) quantity of fan is N, α2With the relational expression of N are as follows:
8. aerofoil fan according to claim 1, it is characterised in that: the centre of the wheel hub (1) is equipped with round sleeve
(1.1), reinforcing rib (1.2) are connected between axle sleeve (1.1) and wheel hub (1) inner wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910774984.1A CN110500320A (en) | 2019-08-21 | 2019-08-21 | A kind of aerofoil fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910774984.1A CN110500320A (en) | 2019-08-21 | 2019-08-21 | A kind of aerofoil fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110500320A true CN110500320A (en) | 2019-11-26 |
Family
ID=68588545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910774984.1A Pending CN110500320A (en) | 2019-08-21 | 2019-08-21 | A kind of aerofoil fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110500320A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013249787A (en) * | 2012-06-01 | 2013-12-12 | Daikin Industries Ltd | Propeller fan |
| CN203730399U (en) * | 2014-03-05 | 2014-07-23 | 珠海格力电器股份有限公司 | Axial flow impeller and axial flow fan |
| CN104131997A (en) * | 2014-07-28 | 2014-11-05 | 广东美的制冷设备有限公司 | Axial flow wind wheel and axial flow fan provided with same |
| CN211230978U (en) * | 2019-08-21 | 2020-08-11 | 广东顺威精密塑料股份有限公司 | Axial fan |
-
2019
- 2019-08-21 CN CN201910774984.1A patent/CN110500320A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013249787A (en) * | 2012-06-01 | 2013-12-12 | Daikin Industries Ltd | Propeller fan |
| CN203730399U (en) * | 2014-03-05 | 2014-07-23 | 珠海格力电器股份有限公司 | Axial flow impeller and axial flow fan |
| CN104131997A (en) * | 2014-07-28 | 2014-11-05 | 广东美的制冷设备有限公司 | Axial flow wind wheel and axial flow fan provided with same |
| CN211230978U (en) * | 2019-08-21 | 2020-08-11 | 广东顺威精密塑料股份有限公司 | Axial fan |
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