CN1350123A - Low-noise industrial scavenger fan - Google Patents
Low-noise industrial scavenger fan Download PDFInfo
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- CN1350123A CN1350123A CN 01127877 CN01127877A CN1350123A CN 1350123 A CN1350123 A CN 1350123A CN 01127877 CN01127877 CN 01127877 CN 01127877 A CN01127877 A CN 01127877A CN 1350123 A CN1350123 A CN 1350123A
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Abstract
The low-noise industrial air-changing fan comprises panel, support, motor box, motor and blade wheel, the blade wheel contains several blades, blade frame and axle sleeve, number of blades is 2-10 blades, every blade is twisted, and arranged in foreraved mode, its blade surface distribution is not symmetrical. The mounting angle alpha on the different primitive-level radius r can be reduced with incrment or r to make blade produce twisted from, the chord b can be increased with increment of r to make blade surface deflect toward outer edge, the front end of blade is a triangle-like flange formed from three circular aras, on its panel a nozzle-shaped collecting device to further reduce noise. Said air-changing fan is high in efficiency, large in flow rate, stable in operation and low in noise, and is applicable to various air-changing fans.
Description
Technical field:
The present invention relates to a kind of industrial scavenger fan, particularly a kind of low noise industrial scavenger fan.
Background technique:
Existing industrial scavenger fan, its blade be plate or show slightly arc, and its blade inlet edge is the great circle arc substantially in arc, adds easy panel, is supported on parts such as support on the panel and motor and forms.Existing this class ventilation fan no doubt because it is simple in structure, and is easy to processing; But its shortcoming also is tangible: the simple and easy air flows rule that do not meet of blade shape, the inefficiency of transformation of energy; The noise that blade and air friction are produced is also big.Current, noise is greatly that existing industrial scavenger fan is failed the common problem that effectively solves.General noise is in the level of 60-80 decibel.
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 the 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 degree 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, low in energy consumption.
Another kind of disclosed ventilation fan blade, be seen in ZL95244882.3 number, and be called in the patent document of " ventilation fan Bidirectional vane wheel ", that is in greater than 4 even leaves, the face of half blade, become the positive crooked shape that caves inward, the half blade becomes reverse curved surface in addition, and promptly reverse side is the crooked shape that caves inward, one positive one anti-homogeneous phase is spaced, one-tenth center symmetry.When no matter it rotates forward or backwards, can both guarantee enough air quantity output, be applicable to that dual direction ventilating fan uses.
Above-mentioned first kind of blade on blade inlet edge roundlet arc this point, slightly improves prior art, but improves not quite, and DeGrain still belongs to slightly curved that class, and is little to the improvement of prior art defective.And second kind of blade is flat substantially, only solve the problem that oppositely still has wind to send, and efficient reduced significantly a lot, and the inefficient flow of air can be bigger.Defective inefficient, strong noise does not still solve.At present, Shang Weijian has a kind of design of blade, is according to aerodynamic principle, improves the working efficiency of ventilation fan to greatest extent, strengthens the ability to work of ventilation fan; Particularly reduce effectively because the noise that disturbance produced of blade.This must start with from the design of blade.
Summary of the invention:
The objective of the invention is to avoid deficiency of the prior art, and a kind of efficient height, big, the low noise industrial scavenger fan of flow are provided.
Purpose of the present invention can reach by following measure:
Industrial scavenger fan of the present invention is made up of panel, support, motor box, motor and impeller.Wherein, the ask for an advance on one's pay support of several struts of frame of motor box is fixed on the panel, and motor then installs in motor box, covers lid; Impeller is supported on the transmission shaft that stretches out in the motor then with the axis hole of its axle sleeve, is driven and is rotated by this.This impeller includes some blades, and parts such as vane frame and axle sleeve are connected to axle sleeve in the rotating shaft of motor, and some blades are fixed on the periphery of axle sleeve by vane frame, or directly are fixed on the wheel hub plate that includes axle sleeve.Each blade is the center with the axis hole of axle sleeve, and the one-tenth center is symmetrically distributed.
It is characterized in that each blade is the meander configuration of non-tablet, blade is the FC setting, and the blade face distributes asymmetric.In the scope of impeller radius, it is divided into some parts, for example 5-7 part is referred to as different primitive level radius r, the primitive level radius maximum of blade tip.The primitive level radius minimum of blade root, the projection that each primitive level radius moves on the blade face constitutes a camber line, the distance of camber line two-end-point is its chord length b, and the angle α of this string of a musical instrument and paddle wheel plane is referred to as established angle, i.e. the established angle of each cross section on the primitive level radius r.Established angle α depends on the air-flow fluid inlet angle β m in this cross section, and the angle of attack under the aerodynamic characteristics optimum Working.So-called meander configuration blade is meant, blade has different established angles on the blade face of different primitive level radius r, this established angle α reduces in 70 ° to 10 ° angular regions gradually, promptly from root of blade to the blade outer rim, reduce the angle of its established angle along with the increase of primitive level radius r gradually, make leaf curling.That is to say that trend towards the outer rim of blade on the blade face more, the degreeof tortuosity on blade face is low more.This is according to the relation of air-flow at the relative velocity of blade import and export, wind triangle that absolute velocity and peripheral velocity constituted, and determines and design the established angle at this place.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, avoids causing air agitation.Thereby raise the efficiency and increase the ability to work of impeller, simultaneously, the also corresponding noise that reduces.
Existing ventilation fan blade is to be the axisymmetric distribution of axle with the impeller radius basically, and air is flow state during running, and air just can not be well-balanced with contacting of this symmetrical blading.Thereby, can cause the turbulent flow of air.So, the design of ventilation fan blade of the present invention, it is asymmetric to adopt the blade face to distribute, and blade is the FC setting.In other words, the distribution of each several part area is asymmetric on the blade face, and turns forward.Adopt and become the circular rector design, make outer edge partly produce big blast, blade face part diametrically distributes and is partial to outer rim, from root of blade to outer rim, each several part blade face area increases gradually on the blade, be that the chord length b of different primitive level radius r on the blade face is also different, increase (limit by outer rim circular arc, the chord length of maximum primitive level radius can slightly make an exception) along with the increase of r.In a circumferential direction from leading edge to trailing edge, each several part blade face area also increases gradually, but is the leading edge portion gross area of axle with the vane frame medial axis, greater than about one times of the rear edge part gross area, i.e. the setting that distributes of blade face turns forward.And blade inlet edge is outstanding towards sense of rotation, and its sideline becomes little circular arc, and radius of arc is less, and relies on outer rim; This leading edge end becomes by three leg-of-mutton beads of the class that circular arc constituted, and is outstanding towards sense of rotation; The radius of arc of trailing edge circular arc is big than leading edge then.Like this, when the leading edge highlight of air draught from blade enters, blade face through FC, in the process that flows to trailing edge and disengage, the surface 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 reduces noise, this phenomenon with diver's " tip entry " is similar.
Usually, the number of blade of each impeller of ventilation fan can be at 2 to 10, even more.But the blade of ventilation fan is the best with 3 to 5.The design adopts the steel of 4 leaves or the blade impeller (band vane frame) that other metal is made; Or the integral wheel (belt wheel hub) with the engineering plastics making of 5 leaves.
For further reducing noise, the design's ventilation fan, returning apparatus has the slip ring of a nozzle shape on panel, be arranged on the periphery of impeller, can be on panel direct forming, or be installed on the panel after making, with impeller be concentric circle, keep certain distance with impeller outer edge, forward towards the impeller airintake direction, so that air-flow, guarantees that it enters the import cross section of impeller equably, does not have big vortex through the afflux of slip ring, reduce flow losses, reduce the interference between blade and the inlet air flow, thereby reduce noise, improve the working efficiency of impeller.This slip ring is one and is enclosed within peripheral forward, the curved nozzle diminishing, that slightly enlarge again to the outlet port of import of impeller, the wall that forms twisted-pair cable nozzle shape, nozzle is the curved surface of arc, resemble one and do the outer ring of arc-shaped protrusions, keep certain distance with impeller to the center.The air that enters impeller can enter equably, guarantees that there is the even velocity field at the impeller eye place, avoids the generation of eddy current.Certainly, also can reduce noise.
Ventilation fan of the present invention has following advantage:
1, efficient height, flow is big.
Owing to,, adopted the blade of meander configuration and FC according to aerodynamic principle in the shape of blade and the design on the established angle, adopt the design of change circular rector, met the air flows rule, brought into play the effect of blade peripheral edge portion to greatest extent, improve the working efficiency of impeller, improve flow.And its rigidity intensity has been strengthened in the design of faceplate of ventilator, is provided with nozzle shape slip ring.Play the reduction energy loss equally, improved the effect of ventilation fan impeller adiabatic efficiency.
2, running is steady, and noise is little.
Same air-flow contacts with blade, and a progressive process is arranged, and meets the air flows rule, avoids the generation of eddy current owing to above-mentioned design, and caing be compared to is that " tip entry " presses well when diving entry.Can reach the purpose that reduces noise.Can be reduced in 55 decibels.An example is, under model and big or small same case, existing impeller is compared with the design, and noise is reduced to 51 decibels from original 58 decibels.The design is applicable to all kinds of ventilation fans, particularly big flow, low noise industrial scavenger fan.
Description of drawings:
Fig. 1 is the structural representation of ventilation fan of the present invention;
Fig. 2 is the plan view of faceplate of ventilator;
Fig. 3 is the plan view of this panel;
Fig. 4 is A-A sectional view on the panel (ratio 2: 1);
Fig. 5 is the stereogram of 4 leaf impellers;
Fig. 6 is the plan view of 4 leaf impellers;
Fig. 7 is the air velocity schematic representation that blade is imported and exported;
Fig. 8 is a blade wind triangle schematic representation;
Fig. 9 is the plan view of blade 5-1;
Figure 10 is its plan view;
Figure 11 is 5 leaf blade wheel structure schematic representation;
Figure 12 is 4 leaf blade wheel structure schematic representation.
Among each figure, the 1st, panel, the 2nd, support, the 3rd, motor box, the 4th, motor, the 5th, impeller, 1-1-are that the slip ring that is provided with on the panel, end box, the 3-2 that 3-1 is motor box are that its lid, 5-1 are that each blade, 5-2 are vane frame, 5-3 is an axle sleeve.In wind triangle, W1, C1 are 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, R is a radius of arc, 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:
Form an industrial scavenger fan by panel 1, support 2, motor box 3, motor 4 and impeller 5.Wherein, motor 4 devices cover lid 3-2 in the end of motor box 3 box 3-1 the inside, and support 2 has 4 struts, and an end of bar connects with fastening piece or is welded on the motor box 3, and the other end also connects with fastening piece or is welded on the panel 1; Impeller 5 includes blade 5-1, vane frame 5-2 and axle sleeve 5-3, as shown in figure 12, blade 5-1 has 4, be separately fixed on the vane frame 5-2 with fastening piece or rivet or welding, be provided with axle sleeve 5-3 in the center fixation of vane frame 5-2, axle sleeve 5-3 tightly is enclosed within on the transmission shaft that motor 4 stretches out.
As Fig. 5, Fig. 6, Fig. 9, shown in Figure 10, meander configuration, FC are adopted in the setting of each blade 5-1 on the 4 leaf impellers, and become the circular rector design.The blade face distributes and to tend to sense of rotation the place ahead and to rely on outer rim, and the leading edge end is the outstanding forward class triangle bead of being made up of three circular arcs.From the root of blade to the outer rim, the area on each several part blade face increases gradually, but towards top rake.Corresponding to the different chord lengths b of primitive level radius r on the blade face, increase along with the increase of r; And the cross section of blade on different primitive level radius r adopts different established angle α, and along with the increase of r, established angle α gradually reduces.The relevant parameter of one of them modular design is as follows:
Impeller outer diameter Dt=250mm, the dish diameter Dh=75mm of vane frame.
| Parameter | Unit | The | ||||
| 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 |
As Fig. 2, Fig. 3, shown in Figure 4, nozzle shape slip ring 1-1 is set on faceplate of ventilator 1.
As mentioned above, parts such as panel, support, motor box, motor, impeller are combined into the industrial scavenger fan of a playscript with stage directions model utility.
Conclusion is got up, and the design method of whole impeller blade and program have following characteristics:
1, according to requirement,, calculates the different beta m on the different primitive level radius r by wind triangle to flow and blast, 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:
With embodiment 1, just, impeller adopts 5 leaf impellers.As shown in figure 11, make the integral plastics impeller 5 that the disk of 5 blade 5-1 and vane frame 5-2 fuses with engineering plastics, axle sleeve 5-3 is arranged on the disk center of vane frame 5-2.Blade 5-1 adopts meander configuration and FC design equally.Each relevant parameter such as following table.All the other are with embodiment 1.
Impeller outer diameter Dt=250mm, vane frame dish diameter Dh=95mm.
| Parameter | Unit | The | |||||
| 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 (7)
1, a kind of low-noise industrial scavenger fan, by panel (1), support (2), motor box (3), motor (4), and impeller (5) is formed, motor (4) device is in motor box (3) lining, motor box (3) is fixed on the panel (1) by support (2), impeller (5) includes some blades (5-1), vane frame (5-2) and axle sleeve (5-3), be connected in the rotating shaft of motor (4) with axle sleeve (5-3), driven by this rotating shaft, it is characterized in that, each blade (5-1) is a meander configuration, be the FC setting, the blade face distributes asymmetric, different established angle α is promptly arranged on the blade face of different primitive level radius r, reduce, make leaf curling along with the increase of r; And the chord length b of different primitive level radius r on the blade face is also different, increase along with the increase of r, and the setting that the blade face distributes turns forward towards sense of rotation.
2, low-noise industrial scavenger fan according to claim 1 is characterized in that, the leading edge end of described blade (5-1) is outstanding towards sense of rotation, and relies on outer rim, becomes the class triangle bead of being made up of three circular arcs; The radius of arc of trailing edge circular arc is big than leading edge then.
3, low-noise industrial scavenger fan according to claim 1 and 2 is characterized in that, the established angle α on the blade face of described different primitive level radiuses reduces in 70 degree angle to 10 degree angular regions gradually.
4, low-noise industrial scavenger fan according to claim 1 and 2 is characterized in that, the sheet number of described some blades (5-1) is in 2 to 10 scopes, and the best is at 3 to 5; The impeller of 4 leaf vanes fixed on vane frame arranged, the integral wheel with 5 leaf blades is also arranged.
5, low-noise industrial scavenger fan according to claim 3 is characterized in that, the sheet number of described some blades (5-1) is in 2 to 10 scopes, and the best is at 3 to 5; The impeller of 4 leaf vanes fixed on vane frame arranged, the integral wheel with 5 leaf blades is also arranged.
6, according to claim 1 or 2 or 5 described low-noise industrial scavenger fans, it is characterized in that, described ventilation fan is gone up the slip ring (1-1) that device has a nozzle shape at panel (1), this slip ring (1-1) is forward in the impeller periphery, keeps outer ring certain distance, make arc-shaped protrusions to the center with impeller.
7, low-noise industrial scavenger fan according to claim 3, it is characterized in that, described ventilation fan is gone up the slip ring (1-1) that device has a nozzle shape at panel (1), this slip ring (1-1) is forward in the impeller periphery, keeps outer ring certain distance, make arc-shaped protrusions to the center with impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01127877 CN1350123A (en) | 2001-09-25 | 2001-09-25 | Low-noise industrial scavenger fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01127877 CN1350123A (en) | 2001-09-25 | 2001-09-25 | Low-noise industrial scavenger fan |
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| CN1350123A true CN1350123A (en) | 2002-05-22 |
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| CN 01127877 Pending CN1350123A (en) | 2001-09-25 | 2001-09-25 | Low-noise industrial scavenger fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402023A (en) * | 2016-09-27 | 2017-02-15 | 孙新年 | Bionic inlaid composite blade |
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2001
- 2001-09-25 CN CN 01127877 patent/CN1350123A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402023A (en) * | 2016-09-27 | 2017-02-15 | 孙新年 | Bionic inlaid composite blade |
| CN106402023B (en) * | 2016-09-27 | 2018-10-19 | 孙新年 | A kind of bionical preparation blade |
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