CN1350122A - Vane wheel of low-noise scavenger fan - Google Patents
Vane wheel of low-noise scavenger fan Download PDFInfo
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- CN1350122A CN1350122A CN 01127876 CN01127876A CN1350122A CN 1350122 A CN1350122 A CN 1350122A CN 01127876 CN01127876 CN 01127876 CN 01127876 A CN01127876 A CN 01127876A CN 1350122 A CN1350122 A CN 1350122A
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Abstract
The blade wheel of low-noise air-changing fan comprises several blades, blade frame and axle sleeve, the number of blades is 2-10, optimum is 3-5, every blade is twisted and foreraked, its blade surface distributino is not symmetrical, the direction deflected to rotation is forward and deflected toward outer edge, the mounting angle alpha on blade surface can be reduced with the incrmeent of primitive-level radius r, the blade is twisted, and the chord b or r on the blade surface is progressively increased, so it is deflected toward outer edge. The front end of the blade possesses a triangle-lire flange formed from three circular arcs. Said blade wheel possesses the advantages of high efficiency, large flow, stable operation and low noise, it is applicable to various air-changing fans.
Description
Technical field:
The present invention relates to the impeller of a kind of impeller of ventilation fan, particularly a kind of low-noise scavenger fan.
Background technique:
The impeller of existing ventilation fan, its blade is plate or slightly curved substantially, and in the blade of arc, its blade inlet edge is the great circle arc substantially, and the blade face distributes axisymmetricly.Blade face established angle in the inclination blade face, does not change to outer rim from the impeller root, adopts an angle of homogeneous, i.e. not distortion.The setting of this blade does not meet the air flows rule, the inefficiency of transformation of energy, and the noise that blade and air friction are produced is also big.Current, noise is greatly the common problem that existing industrial scavenger fan exists.General, noise is in 60～80 decibel level.
Chinese patent ZL93228964.9. name is called in the patent document of " air scavenger fan fan blade ", a kind of circular arc fan blade (i.e. " blade ") is disclosed, its fan blade leading edge is little circular shape, this roundlet forearc edge radius R 1 is controlled between 20～35mm, the leading edge fluid inlet angle approaches zero degree (promptly with the wheel hub plate plane parallel), trailing edge radius of arc R2=50mm; The position X of fan blade maximum chord length is controlled between the 0.7-0.9, i.e. r: R=0.7-0.9, and r is the distance of the long-chord of fan blade to the fan blade axle center, R is the fan blade maximum radius.This blade structure it is said advantage such as have the efficient height, noise is little, and is low in energy consumption.
The blade of this ventilation fan on blade inlet edge roundlet arc this point, slightly improves prior art, but still belongs to that class that shows slightly arc; Blade contacts with air-flow, does not meet the rule of air flows, and is little to the improvement of prior art defective, and defective inefficient, strong noise does not still solve.At present, do not see with good grounds aerodynamic principle as yet, improve the working efficiency of ventilation fan to greatest extent, strengthen the ability to work of ventilation fan, particularly reduce effectively because the outstanding Blade Design of the noise that the blade disturbance is produced.
Summary of the invention:
The objective of the invention is to avoid deficiency of the prior art, a kind of efficient height, flow are big, the impeller of low noise ventilation fan and provide.
Purpose of the present invention can reach by following measure:
Ventilation fan impeller of the present invention includes some blades, vane frame and axle sleeve, and wherein each blade is a meander configuration, FC, the blade face distributes asymmetric, and biases toward the front towards sense of rotation, and is partial to the blade outer rim; Its leading edge is in forward and rely on the position of outer rim, the blade face of an outstanding fritter circular arc, the class gore that this bead face is made up of three roundlet arcs, and the edge of whole blade constitutes by circular arc line not of uniform size, generally speaking leading edge is less circular arc, trailing edge is bigger circular arc, becomes a kind of blade of circular arc plate blade profile.
So-called meander configuration is with regard to the angle of inclination on blade face.Inlet from impeller enters when air stream, and the blade blade face of flowing through is left from the outlet port, and the absolute velocity of inlet/outlet is arranged; Blade moves, and the relative velocity of inlet/outlet is also just arranged; Blade rotation, footpath upwards each several part have its peripheral velocity.The relation of these parameter of velocity constitutes an air-flow and imports and exports velocity triangle.According to aerodynamic principle, for the efficient and the flow that improve impeller, the established angle of blade each several part should change, and these different established angle α depend on the air-flow fluid inlet angle β m in this cross section, and the angle of attack under the aerodynamic characteristics optimum Working.Will be from the axle center be divided into some parts to the impeller radius of outer rim, for example 5-7 part is referred to as primitive level radius r.The blade tip place is maximum primitive level radius, and the blade root place is minimum primitive level radius.The projection that each primitive level radius moves on the blade face constitutes a camber line, and the distance of string of a musical instrument two-end-point is its chord length b, and the angle of this string of a musical instrument and paddle wheel plane is referred to as established angle α.From the root of blade to the blade outer rim, different blade face established angle α on the different primitive level radius r, be to the scope of 10 degree, to gradually change at 70 degree, show from root of blade to the blade outer rim, increase along with primitive level radius r, and reducing the angle of the established angle α on the blade face gradually, blade presents distortion.That is to say that the blade face trends towards outer rim more, the degreeof tortuosity on blade face is low more.The blade of this meander configuration not only can produce certain blast, also meets the flowing law that blade contacts with air, reduces the impact between blade and the air, avoided the disturbance of air, thereby improve the ability to work of impeller adiabatic efficiency and increasing impeller, simultaneously, the also corresponding noise that reduces.
So-called FC is with regard to the blade face distribution of blade.The variation of blade face distribution area adds vicissitudinous different established angle, also produces the variation of blast on the blade face thereupon.For making this distribution more reasonable,, should tilt towards the direction of advancing with the rule of aerodynamic; And adopt the design of change circular rector, and allow outer edge partly produce big blast, less by the blast of core.The distribution of blade face each several part area is asymmetric, is partial to outer rim diametrically; Be partial to sense of rotation in a circumferential direction forward, and even,, be provided with towards the outstanding bead of sense of rotation near the outer rim position at blade inlet edge.This bead is by three class gores that circular arc constituted.Like this, to the blade outer rim, each several part blade face area increases gradually on the blade radial from root of blade, shows different primitive level radius r different chord length b on the blade face, increases along with the increase of r, and the blade face is arranged and biased toward towards sense of rotation forward.Certainly, because blade will be made arc, the chord length b at maximum r place can do suitable correction, and slightly reduces.And serve as that axle is divided into leading edge and the two-part words of trailing edge with the vane frame medial axis, then the leading edge portion area is about the twice of rear edge part, and blade face distribution just is obliquely installed to leading edge portion.And the radius of arc of edge, blade face circular arc, the radius of arc of leading edge portion is less, and the radius of arc of rear edge part is bigger, is commonly called as " orthodrome ".Like this, when the less bead of air-flow from blade inlet edge enters, through laying particular emphasis on the FC blade face of outer rim (peripheral velocity of outer rim is bigger), flow to the trailing edge of orthodrome and leave in the whole process on blade face, the area of contact of air-flow and blade and wrapping angle have an ascending progressive formation, meet the air flows rule, reduced in formed eddy current of blade surface and forcing frequency, reached the purpose that improves impeller adiabatic efficiency and reduce noise.This is similar with the phenomenon that diver's " tip entry " presses well.
The number of blade of impeller of the present invention, usually at 2 to 10, in addition more.But with 3 to 5 is the best.The design's embodiment has the impeller (having vane frame) of 4 blades, and the integral wheel (blade is directly connected on the wheel hub plate) of 5 leaf blades is also arranged.The impeller useful metal is made, and also useful engineering plastics are made.
Impeller of the present invention has following advantage:
1, efficient height, flow are big.
On the established angle and blade face distribution of blade, owing to, adopted meander configuration and FC according to aerodynamic principle, and change circular rector design, meet the air flows rule, brought into play the effect of blade peripheral edge portion to greatest extent, improved the working efficiency and the ability to work of impeller.
2, running is steady, noise is little.
Same air-flow contacts with blade, and a progressive process is arranged, and meets the air flows rule, avoids the disturbance of air and the generation of eddy current owing to above-mentioned design, and " tip entry " presses well when caing be compared to diver's entry.Can greatly reduce noise, drop in 55 decibels.An example is, under the model situation identical with size, existing certain impeller is compared with the design, and its noise is reduced to 51 decibels from 58 decibels.The suitable all kinds of ventilation fans, particularly big flow, low noise industrial scavenger fan of being applied to of the design.
Description of drawings:
Fig. 1 is the stereogram of 4 leaf impellers;
Fig. 2 is the structural representation of 4 leaf impellers;
Fig. 3 is the stereogram of 5 leaf impellers;
Fig. 4 is the structural representation of 5 leaf impellers;
Fig. 5 is the air velocity schematic representation of the enterprising outlet in blade blade face;
Fig. 6 blade wind triangle schematic representation;
Fig. 7 is the plan view of blade 1;
Fig. 8 is its plan view;
Fig. 9 is asymmetric FC blade schematic representation;
Figure 10 is the schematic representation that symmetrical blade contrasts with it.
Among each figure, the 1st, blade, the 2nd, vane frame, the 3rd, axle sleeve, r are different primitive level radiuses.In wind triangle, W1, C1 is respectively the relative velocity and the absolute velocity of blade inlet, W2, C2 are respectively the relative velocity and the absolute velocity in outlet port, u is a peripheral velocity on the blade profile, Wm is the average relative in certain cross section, and Δ Cu is the projection of absolute velocity on circumference, and β m represents the air-flow fluid inlet angle in certain cross section.
Embodiment:
Embodiment 1:
As shown in Figure 1 and Figure 2, with the vane frame 2 of a cross star formula of steel plate making, its center is an axle sleeve 3, on 4 arms of vane frame 2, connect with fastening piece or rivet respectively or weld last 4 blades 1, every blade all is meander configuration, FC, adopts to become the circular rector design.Be the blade face distribution on the blade, tend to the place ahead of sense of rotation and rely on outer rim that to its outer rim, the area on each several part blade face increases gradually from root of blade, and its distribution is tilted towards leading edge.Show the different chord lengths b on the pairing blade face of different primitive level radius r, increase along with the increase of r.Different established angle α as for the blade face then change along with different primitive level radius r, and the blade face presents distortion, and along with the increase of r, established angle α gradually reduces.The relevant parameter of a modular design is as follows:
Impeller outer diameter Dt=250mm, the disk diameter Dh=75mm of vane frame.
| Parameter | Unit | The cross section | ||||
| 2 times of primitive level radiuses (2r) | ??mm | ????76 | ????141 | ????185 | ????220 | ????250 |
| Blade profile established angle (α) | Degree | ????67 | ????46 | ????37 | ????31 | ????27 |
| Blade profile chord length (b) | ??mm | ????54 | ????91 | ????111 | ????126 | ????140 |
Conclusion is got up, and the design method of whole impeller blade and program have following characteristics:
1, according to requirement to flow and blast, calculate different beta m on the different primitive level radius r by wind triangle, find the angle of attack under the optimum Working, calculate different established angle α again, design the meander configuration blade, thereby improve impeller adiabatic efficiency and ability to work thereof.
2, adopt to become the circular rector flow pattern, the blade face is arranged be partial to outer rim, giving full play to the effect of blade outer rim, and can lower the twist angle at this place.
3, adopt the circular arc plate blade profile.According to the aerodynamic force equation.Calculate the different chord lengths b on the different r, to guarantee on the blade certain blast p being arranged.
4, be further to reduce noise, adopt the design of FC blade profile, and be provided with a bead, so that still can obtain low noise effect during enlargement discharge at leading edge airflow inlet place; And b and the suitably correction of α do to calculating.Draw the design parameter shown in subordinate list at last.
Embodiment 2:
As shown in Figure 3, Figure 4, with embodiment 1, just, make the integral wheel of 5 leaves with engineering plastics, 5 blades 1 directly are connected on the wheel hub plate as vane frame 2, and there is axle sleeve 3 at the center.The design of meander configuration FC is taked in being provided with of each blade 1 equally.Relevant parameter such as following table.All the other are with embodiment 1.
Impeller outer diameter Dt=250mm.The dish diameter Dh=95mm of vane frame.
| Parameter | Unit | The cross section | |||||
| 2 times of primitive level radiuses (2r) | ??mm | ??95 | ??150 | ??190 | ??222 | ??235 | ??250 |
| Blade profile established angle (α) | Degree | ??43 | ??40 | ??30 | ??26 | ??24 | ??23 |
| Blade profile chord length (b) | ??mm | ??50 | ??80 | ??105 | ??123 | ??130 | ??101 |
Claims (5)
1, a kind of impeller of low-noise scavenger fan, include some blades (1), vane frame (2) and axle sleeve (3), it is characterized in that, each blade (1) is meander configuration, FC, and the blade face distributes asymmetric, and is partial to blade sense of rotation front and deflection blade outer rim, show from root of blade to the blade outer rim, along with the increase of primitive level radius r, and reduce the angle of the established angle α on the blade face gradually, blade presents distortion; And different primitive level radius r different chord length b on the blade face increases along with the increase of r, and the blade face is arranged and biased toward towards sense of rotation forward.
2, the impeller of low-noise scavenger fan according to claim 1, it is further characterized in that, in described blade (1) leading edge near the outer rim position, be provided with towards sense of rotation outstanding, by three class triangle beads that circular arc constituted; And the radius of arc of leading edge portion is less, and the radius of arc of rear edge part is bigger.
3, the impeller of low-noise scavenger fan according to claim 1 and 2 is characterized in that, different blade face established angle α on the described different primitive level radius r gradually changes in 70 degree angle to 10 degree angular regions.
4, the impeller of low-noise scavenger fan according to claim 1 and 2, it is characterized in that, the sheet number of described some blades (1) is in 2 to 10 scopes, the best is at 3 to 5, there are 4 blades (1) to be fixed on impeller on the vane frame (2), the integral wheel with 5 blades (1) is also arranged.
5, the impeller of low-noise scavenger fan according to claim 3, it is characterized in that the sheet number of described some blades (1) is in 2 to 10 scopes, the best is at 3 to 5, there are 4 blades (1) to be fixed on impeller on the vane frame (2), the integral wheel with 5 blades (1) is also arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01127876 CN1350122A (en) | 2001-09-25 | 2001-09-25 | Vane wheel of low-noise scavenger fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01127876 CN1350122A (en) | 2001-09-25 | 2001-09-25 | Vane wheel of low-noise scavenger fan |
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| Publication Number | Publication Date |
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| CN1350122A true CN1350122A (en) | 2002-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01127876 Pending CN1350122A (en) | 2001-09-25 | 2001-09-25 | Vane wheel of low-noise scavenger fan |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757562A (en) * | 2018-05-31 | 2018-11-06 | 广东泛仕达农牧风机有限公司 | A kind of novel livestock fan blade and the herding wind turbine including the fan blade |
| CN111231327A (en) * | 2020-01-10 | 2020-06-05 | 中铁第十八工程局涿州水泵厂 | Production process of fan impeller |
| CN111503049A (en) * | 2020-03-06 | 2020-08-07 | 深圳福世达动力科技有限公司 | Combined deformation large-inclination-angle blade |
| CN112392764A (en) * | 2020-10-30 | 2021-02-23 | 奇鋐科技股份有限公司 | Axial flow fan blade structure |
-
2001
- 2001-09-25 CN CN 01127876 patent/CN1350122A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757562A (en) * | 2018-05-31 | 2018-11-06 | 广东泛仕达农牧风机有限公司 | A kind of novel livestock fan blade and the herding wind turbine including the fan blade |
| CN111231327A (en) * | 2020-01-10 | 2020-06-05 | 中铁第十八工程局涿州水泵厂 | Production process of fan impeller |
| CN111503049A (en) * | 2020-03-06 | 2020-08-07 | 深圳福世达动力科技有限公司 | Combined deformation large-inclination-angle blade |
| CN112392764A (en) * | 2020-10-30 | 2021-02-23 | 奇鋐科技股份有限公司 | Axial flow fan blade structure |
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