CN104632700B - Dual-impeller device of centrifugal blower - Google Patents

Dual-impeller device of centrifugal blower Download PDF

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Publication number
CN104632700B
CN104632700B CN201510063523.5A CN201510063523A CN104632700B CN 104632700 B CN104632700 B CN 104632700B CN 201510063523 A CN201510063523 A CN 201510063523A CN 104632700 B CN104632700 B CN 104632700B
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CN
China
Prior art keywords
blade
impeller
out rotor
interior impeller
wheel disc
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.)
Expired - Fee Related
Application number
CN201510063523.5A
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Chinese (zh)
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CN104632700A (en
Inventor
窦华书
肖美娜
魏义坤
陈小平
杨徽
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Priority to CN201510063523.5A priority Critical patent/CN104632700B/en
Publication of CN104632700A publication Critical patent/CN104632700A/en
Application granted granted Critical
Publication of CN104632700B publication Critical patent/CN104632700B/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30Vanes

Abstract

The invention discloses a dual-impeller device of a centrifugal blower. In many industrial sites, the change range of air volume is large, and the flow ranges of small-flow draught fans can not meet the requirements; large-flow draught fans are high in energy consumption when the air volume is small. The dual-impeller device comprises an outer impeller and an inner impeller. The surface of each blade is provided with floatable protrusions. The floatable protrusions are in socket joint with the surfaces of the blades through hinged bars. A cavity of each blade is internally and fixedly provided with a transverse reinforcing plate and a plurality of oblique reinforcing plates, and color talcum powder is added into the cavity of the blade. A wheel disk flow deflector is fixedly arranged at the position, located under each blade, of a wheel disk. Different impellers can be selectively switched on according to the requirement for air volume, the reasonable running range of the centrifugal blower can be expanded, and the airflow pressure of the centrifugal blower can be increased, so the centrifugal blower achieves multiple functions; the inner impeller and the outer impeller are switched on simultaneously, the inner impeller does work to low-speed fluid at the wheel disk, the airflow speed difference of inlets of the blades, the wheel disk and a wheel cover can be effectively reduced, and the airflow speed at the inlets of the blades is more uniform, so efficiency is improved, and noise is lowered.

Description

A kind of bilobed wheel device of centrifugal fan
Technical field
The invention belongs to field of ventilation equipment, relate to centrifugal fan, be specifically related to the bilobed wheel of a kind of centrifugal fan Device.
Background technology
Blower fan is as a kind of more common plant equipment, along with the development of society's science and technology is greatly improved, domestic work The development of industry have stimulated the usage amount of blower fan further, and the use of blower fan is increasingly paid attention to by user.In China's energy day Today of benefit shortage, the energy-saving and cost-reducing target being a lot of user and dreaming of, but blower fan always there will be very in routine use Many wasting phenomenons, have increased the weight of the Financial cost spending of user, to this end, the usefulness improving blower fan is imperative.
Centrifugal fan is mainly made up of structures such as current collector, impeller, spiral case and bubblers.Gas is through current collector directing vane Wheel, under the turning effort of impeller, pressure raises.From impeller gas out, spiral case collect and guide to volute outlet, and After bubbler again diffusion, it is transported to pipeline or enters in air.
In the assembly that blower fan is numerous, impeller is that blower fan is the most indispensable, and the quality of Impeller Mass directly affects wind The performance of machine performance.As the heart of centrifugal fan, impeller produces power by an inverse journey that presses through, reaches ventilation Purpose.When air-flow flows through draught fan impeller runner, flowing can be produced damage owing to stickiness effect is by blade surface frictional resistance Lose, and then cause the reduction of blower press, affect fan performance.Due to pressure reduction, blade pressure in impeller channel, typically can be there is Towards the secondary flow of suction surface, simultaneously because air-flow is transferred to Radial Flow by axially flowing, cause wheel disc pressure more than wheel cap Pressure also can form Secondary Flow, causes occurring that low regime even separates at the wheel cap of impeller and blade suction surface, forms jet-tail Mark structure, the i.e. relative velocity near suction surface are low, high near the relative velocity of pressure face.Due to depositing of jet-wake structure , cause centrifugal blower efficiency to decline, noise increases.At blade inlet, due to the turning of 90 ° of air-flow, the fluid speed at wheel cap Degree is higher than at wheel disc, and the air velocity making entrance blade is uneven, affects the stability of air current flow.
Existing centrifugal fan is divided into Multiple Type according to the difference of air quantity, such as 4500m3/h、4501-7000 m3/ h and 7001-19300m3/ h etc..The ventilation of different model is selected according to requirement to ventilation blower air quantity under different industrial applications Machine, however as the fast development of industry both at home and abroad, a lot of industrial site apoplexy amount excursions are relatively big, and assembling space Limited.According to low discharge blower fan, its range of flow can not meet industrial requirements;According to big flow fan, then at air quantity relatively Hour, there is the phenomenon of " low load with strong power ", energy consumption is bigger.
Summary of the invention
It is an object of the invention to for the deficiencies in the prior art, it is provided that the bilobed wheel device of a kind of centrifugal fan, according to The requirement of different air quantity, selects to open different impellers, under low discharge, impeller in only opening, under big flow, open simultaneously interior, Out rotor, not only can improve the reasonable range of operation of ventilation blower, can improve the pressure of air-flow, it is achieved the one of centrifugal fan simultaneously Machine is multiplex.
The present invention includes out rotor and interior impeller, and out rotor is nested with at interior impeller outer;Described out rotor includes wheel cap, wheel Dish, reel and blade, interior impeller includes wheel disc, reel and blade;The reel of out rotor and the reel of interior impeller are propped up by bearing Hold on two power input shafts;Two power input shafts are coaxially disposed, and input power respectively.The wheel disc of described out rotor is solid Being scheduled on reel, more blades is evenly distributed, and side is each attached to the outer of wheel disc, and opposite side is all fixed with wheel cap;Described The wheel disc of interior impeller is fixed on reel, and more blades is evenly distributed, and side is each attached on wheel disc, root all with reel Periphery is fixed;The lobe numbers of interior impeller is 2~10 times of out rotor lobe numbers;The blade dimensions of out rotor is interior impeller 1.2~3 times of blade dimensions;It is identical that interior impeller installs rotation direction with the blade of out rotor.
The blade surface of described interior impeller and out rotor is equipped with floating convex sets, and described floating convex sets includes multiple The floated projection parabolically arranged, described parabolical opening is arranged towards the air stream outlet direction of blade, near blade point The floated projection in portion is parabolical summit;Described floated projection is spherical, and hinge bar and blade surface are passed through in bottom Ball-joint;The centre of sphere of projection can be floated to the distance on blade respective side edge near root of blade with near two of blade tip Equal with the ratio of width of blade, it is 1/8~1/4.
The blade shape of described interior impeller and out rotor can be board-type, arc template or airfoil type;Described blade is provided with Cavity, the shape of cavity is identical with blade profile, is fixed with transversely strengthening plate and the oblique securing plate of polylith, and adds in cavity Colored slip stone powder;Two pieces of oblique securing plates are disposed adjacent, and one end with transversely strengthening plate is fixed respectively;These two pieces of oblique reinforcings V-shaped setting is all fixed in plate and the most adjacent oblique securing plate end, every two pieces of oblique securing plate ends that remaining is adjacent.
Described wheel disc is positioned at immediately below every blade to be located all to be fixed with a piece of wheel disc flow deflector;Described wheel disc water conservancy diversion The curvature of sheet and blade crowning homonymy is more than the curvature of opposite side.
The described number floating projection is together decided on by width and the length of blade.
Deafener is added on described hinge bar.
Described a diameter of the 1~5mm of projection of floating, the centre of sphere spacing of adjacent two projections of can floating is 8~15mm.
When the blade shape of described interior impeller and out rotor is arc template or airfoil type, it is convex that transversely strengthening plate is arranged on blade At the maximum curvature in the face of rising.
Beneficial effects of the present invention:
The present invention is made up of interior impeller and out rotor, can select to open according to requirement to air quantity in different commercial production Different impellers, under low discharge, impeller in only opening, under big flow, open inside and outside impeller simultaneously, not only can improve centrifugal logical The reasonable range of operation of blower fan, can improve the pressure of air-flow, it is achieved a tractor serves several purposes of centrifugal fan simultaneously;Open simultaneously interior, During out rotor, the low velocity fluid at wheel disc is done work by interior impeller, makes fluid velocity improve, can effectively reduce at blade inlet, Air velocity at wheel disc and wheel cap is poor, makes the air velocity at blade inlet evenly.Additionally, sculptured surface changes The flow field of near wall region, can be effectively increased the thickness of viscous sublayer on blade non-smooth surface, reduces near wall region Velocity gradient, reduces skin friction drag;There is the blade of hollow structure and securing plate, the intensity of blade can be strengthened, strengthen leaf The wear-resisting loss of sheet, extends the service life of draught fan impeller;Pulvis Talci in cavity is easy to staff and is found the impaired of blade Situation, maintenance in time and maintenance, reduce cost allowance;Wheel disc is provided with wheel disc flow deflector, has water conservancy diversion and advances the effect of air-flow, The pressure of centrifugal fan can be improved, reduce flow losses, improve impeller adiabatic efficiency.
Accompanying drawing explanation
Fig. 1 is the overall structure axonometric chart of the present invention;
Fig. 2 is the structural perspective of out rotor in the present invention;
Fig. 3 is the structural perspective of interior impeller in the present invention;
Fig. 4 is the structural representation of Leaf of the present invention;
Fig. 5 is the cross sectional representation of Leaf of the present invention;
Fig. 6 is the schematic diagram of wheel disc in the present invention;
Fig. 7 is the operation principle schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
As shown in Figure 1,2 and 3, the bilobed wheel device of a kind of centrifugal fan, including out rotor 2 and interior impeller 3, out rotor 2 are nested with outside interior impeller 3;Out rotor 2 include wheel cap A, wheel disc B, reel and blade D, interior impeller 3 include wheel disc B, reel C and Blade D;The reel of out rotor 2 and the reel C of interior impeller 3 are bearing on two power input shafts by bearing;Two power are defeated Enter axle to be coaxially disposed, and input power respectively.
As in figure 2 it is shown, the wheel disc B of out rotor 2 is fixed on reel, four blade D are evenly distributed, and side is each attached to The outer of wheel disc B, opposite side is all fixed with wheel cap A.
As it is shown on figure 3, the wheel disc B of interior impeller 3 is fixed on reel C, 12 blade D are evenly distributed, and side is the most solid Being scheduled on wheel disc B, root all peripheries with reel C are fixed;The blade dimensions of out rotor 2 is the 3 of interior impeller 3 blade dimensions Times;It is identical that interior impeller 3 installs rotation direction with the blade of out rotor 2.
As shown in Figure 4, the blade surface of interior impeller 3 and out rotor 2 is equipped with floating convex sets, and floating convex sets includes ten Two the floated projection parabolically arranged D-2, parabolical opening is arranged towards the air stream outlet direction of blade, near blade The floated projection D-2 of tip is parabolical summit;The protruding D-2 that can float is spherical, and hinge bar and blade table are passed through in bottom Face D-1 ball-joint, can rotate along with wind direction;Deafener is added on hinge bar;Near root of blade with near two of blade tip The centre of sphere of projection of can floating D-2 is 1/4 to the distance on blade respective side edge and the ratio of width of blade;Can be floated protruding D- A diameter of 3mm of 2, the centre of sphere spacing of adjacent two protruding D-2 that can float is 10mm, and the number of the protruding D-2 that can float is by blade Width and length together decide on.
As it is shown in figure 5, the blade D-shaped shape of interior impeller 3 and out rotor 2 is airfoil type;Blade is provided with cavity D-3, cavity D-3 Shape identical with blade profile, be fixed with transversely strengthening plate D-5 and five pieces of oblique securing plates D-4 in cavity, and add coloured silk Color Pulvis Talci;Two pieces of oblique securing plates D-4 are disposed adjacent, and one end with transversely strengthening plate D-5 is fixed respectively;These two pieces oblique Securing plate D-4 and the most adjacent oblique securing plate D-4 end, every two pieces of oblique securing plate D-4 ends that remaining is adjacent are the most solid Fixed V-shaped setting;Transversely strengthening plate D-5 is arranged at the maximum curvature of blade crowning.
As shown in Figure 6, wheel disc B is positioned at immediately below every blade and locates all to be fixed with a piece of wheel disc flow deflector B-1;Wheel disc is led The curvature of flow B-1 and blade crowning homonymy is more than the curvature of opposite side.
As it is shown in fig. 7, gas guides interior impeller 3 and out rotor 2 through current collector 1, in interior impeller 3 and the rotation of out rotor 2 Under effect, pressure raises.From interior impeller 3 and out rotor 2 gas out, spiral case 4 collect and guide to volute outlet, then It is transported to pipeline or enters in air.Wherein, interior impeller 3 and out rotor 2 are by two power input shafts input power respectively.
The bilobed wheel device of this centrifugal fan, can select to open to take not according to requirement to air quantity in different commercial production Same impeller, under low discharge, only opens and takes interior impeller, under big flow, open inside and outside impeller simultaneously, not only can improve ventilation blower Rationally range of operation, can improve the pressure of air-flow, it is achieved a tractor serves several purposes of centrifugal fan simultaneously.Additionally, open inside and outside simultaneously During impeller, the low velocity fluid at wheel disc is done work by interior impeller, makes fluid velocity improve, and can effectively reduce at blade inlet, wheel Air velocity at dish and wheel cap is poor, makes the air velocity at blade inlet evenly, thus improves efficiency, reduces noise.
Blade utilizes bionic, non-smooth technology to change the flow field of blade near wall region, can be effectively increased on blade non-smooth surface The thickness of viscous sublayer, reduces the velocity gradient near wall region, then reduces skin friction drag, reduces flowing and damages Lose, reduce energy consumption, improve fan efficiency.
The bilobed wheel device of this centrifugal fan, blade use hollow structure, lighter weight, decrease impeller transport and Trouble in handling process, reduces production cost;Rounded projections arranged between securing plate, adds stablizing of blade and securing plate Property;At the maximum curvature of blade pressure surface, it is the most frayed place of blade pressure surface, securing plate is set in this place, not only The intensity of blade can be strengthened, also can strengthen the wear-resisting loss at this, extend the service life of draught fan impeller, increase economic efficiency; When vanes cross life-time service the least gap occurs time, the Pulvis Talci in cavity, under blade centrifugal action, is inserted in gap, Alleviating blade wear speed, when blade gaps is bigger, colored Pulvis Talci is thrown out of, it is simple to staff finds being subject to of blade Damage situation, maintenance in time and maintenance, reduce cost allowance.
The wheel rim of existing circular wheel disc as this is shown in phantom in fig. 6, owing to being uneven distribution at wheel disc exit air-flow, Under the effect of velocity gradient, it is easily generated flow losses, reduces fan efficiency.It is provided with the wheel disc area phase of wheel disc flow deflector B-1 Less to circular wheel disc, alleviate the quality of impeller so that it is be easily installed and transport;Impeller is flowed out by wheel disc flow deflector B-1 Air-flow has guide functions, reduces air-flow leakage between wheel disc and spiral case;Be conducive to improving the inequality of air-flow at impeller outlet Even property, reduces flow losses, improves impeller adiabatic efficiency;Additionally, wheel disc flow deflector B-1 can advance air-flow, air-flow is done work, improve logical The pressure of blower fan.

Claims (5)

1. a bilobed wheel device for centrifugal fan, including out rotor and interior impeller, out rotor is nested with at interior impeller outer, and it is special Levy and be:
Described out rotor includes that wheel cap, wheel disc, reel and blade, interior impeller include wheel disc, reel and blade;The axle of out rotor The reel of dish and interior impeller is bearing on two power input shafts by bearing;Two power input shafts are coaxially disposed, and respectively Input power;The wheel disc of described out rotor is fixed on the reel of out rotor, and more blades is evenly distributed, and side is each attached to The wheel disc outer of out rotor, opposite side all wheel caps with out rotor are fixed;The wheel disc of described interior impeller is fixed on the axle of interior impeller On dish, more blades is evenly distributed, and side is each attached on the wheel disc of interior impeller, root all with the reel periphery of interior impeller Fixing;The lobe numbers of interior impeller is 2~10 times of out rotor lobe numbers;The blade dimensions of out rotor is interior impeller blade chi Very little 1.2~3 times;It is identical that interior impeller installs rotation direction with the blade of out rotor;
The blade surface of described interior impeller and out rotor is equipped with floating convex sets, and described floating convex sets includes multiple in throwing The floated projection of thing line arrangement, described parabolical opening is arranged towards the air stream outlet direction of blade, near blade tip Can float protruding for parabolical summit;Described floated projection is spherical, and bottom is by hinge bar and blade surface ball pivot Connect;The centre of sphere of projection can be floated to the distance on blade respective side edge and leaf near root of blade with near two of blade tip The ratio of sheet width is equal, is 1/8~1/4;
The blade shape of described interior impeller and out rotor is board-type, arc template or airfoil type;Described blade is provided with cavity, empty The shape in chamber is identical with blade profile, is fixed with transversely strengthening plate and the oblique securing plate of polylith, and adds colored slip in cavity Stone powder;Two pieces of oblique securing plates are disposed adjacent, and one end with transversely strengthening plate is fixed respectively;These two pieces of oblique securing plates are with each From adjacent oblique securing plate end, remaining adjacent every two pieces of oblique securing plate end all fix V-shaped setting;
The wheel disc of described out rotor is positioned at immediately below every blade to be located all to be fixed with a piece of wheel disc flow deflector;Described wheel disc is led The curvature of flow and blade crowning homonymy is more than the curvature of opposite side.
The bilobed wheel device of a kind of centrifugal fan the most according to claim 1, it is characterised in that: described projection of floating Number together decided on by width and the length of blade.
The bilobed wheel device of a kind of centrifugal fan the most according to claim 1, it is characterised in that: on described hinge bar Add deafener.
The bilobed wheel device of a kind of centrifugal fan the most according to claim 1, it is characterised in that: described projection of floating A diameter of 1~5mm, adjacent two can float projection centre of sphere spacing be 8~15mm.
The bilobed wheel device of a kind of centrifugal fan the most according to claim 1, it is characterised in that: described interior impeller is with outer When the blade shape of impeller is arc template or airfoil type, transversely strengthening plate is arranged at the maximum curvature of blade crowning.
CN201510063523.5A 2015-02-06 2015-02-06 Dual-impeller device of centrifugal blower Expired - Fee Related CN104632700B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201510063523.5A CN104632700B (en) 2015-02-06 2015-02-06 Dual-impeller device of centrifugal blower

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CN104632700B true CN104632700B (en) 2017-01-11

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107023509B (en) * 2016-02-01 2020-08-11 宁波方太厨具有限公司 Fan impeller and fan adopting same
CN105756987B (en) * 2016-04-26 2017-07-14 浙江理工大学 A kind of bluetooth far controls the centrifugal ventilation machine device of adjustable vane
CN108869332A (en) * 2018-07-11 2018-11-23 大连碧蓝节能环保科技有限公司 Coaxial two-stage cross flow fan
CN112503021A (en) * 2020-10-12 2021-03-16 浙江铭振电子股份有限公司 Impeller

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Publication number Priority date Publication date Assignee Title
JP5171145B2 (en) * 2007-07-25 2013-03-27 株式会社日立産機システム Blower
US9267507B2 (en) * 2011-10-05 2016-02-23 Asia Vital Components Co., Ltd. Blade structure for centrifugal fan
CN202431609U (en) * 2012-02-09 2012-09-12 河北华强科技开发有限公司 Fan blade
CN103967833A (en) * 2013-01-29 2014-08-06 陈耀乾 Compound impeller and air blowing device with same
CN203189326U (en) * 2013-04-16 2013-09-11 罗兆波 Centrifugal wind wheel
CN203500112U (en) * 2013-09-29 2014-03-26 新昌县三新空调风机有限公司 Energy-saving axial flow fan

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Granted publication date: 20170111

Termination date: 20190206