CN203098139U - Counter-rotating double-impeller wind turbine structure suitable for minitype wind generator - Google Patents

Counter-rotating double-impeller wind turbine structure suitable for minitype wind generator Download PDF

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Publication number
CN203098139U
CN203098139U CN2013201388689U CN201320138868U CN203098139U CN 203098139 U CN203098139 U CN 203098139U CN 2013201388689 U CN2013201388689 U CN 2013201388689U CN 201320138868 U CN201320138868 U CN 201320138868U CN 203098139 U CN203098139 U CN 203098139U
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China
Prior art keywords
impeller
level
axle
order
wind
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Expired - Fee Related
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CN2013201388689U
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Chinese (zh)
Inventor
李志强
吴云柯
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Beihang University
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Beihang University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

The utility model discloses a counter-rotating double-impeller wind turbine structure suitable for a minitype wind generator. The counter-rotating double-impeller wind turbine structure is suitable for a wind turbine system of the minitype wind generator in the wind power generation field. On the premise that the dimension of a wind turbine is basically not changed, a primary wind turbine is added, a novel coaxial counter-rotating double-impeller structure is adopted, and a flow field between two impellers is coupled, so that on the basis that the primary wind turbine fully utilizes wind for generating power, the primary wind turbine also becomes an inlet guide vane and a straightening vane of a secondary impeller, and the wind energy utilization ratio of a single set of counter-rotating wind turbine wind power generation devices is more than 1.5 times of that of a conventional single-shaft and single-impeller wind driven generator. A counter-rotating turbine is simple in structure and convenient to manufacture, popularize and apply.

Description

A kind of bilobed wheel of small-sized wind power generator that is applicable to is to changeing wind wheel structure
Technical field
The utility model relates to a kind of bilobed wheel that is applicable to small-sized wind power generator to changeing wind wheel structure, belongs to Wind Power Utilization and technical field of wind power generation.
Background technique
Wind energy has obtained application more and more widely in the world as renewable energy sources.In order to improve utilization ratio of wind energy, wind turbine is in the majority with three blade horizontal axis types mostly at present, the wind wheel size is all bigger, the rotor diameter of domestic maximum has reached more than 70 meters, but the highest ability about 0.4 of its wind energy utilization [Zhang Guoyu. wind-driven generator complete machine aeroperformance numerical simulation calculation and simulation study [D]. Wuhan: Wuhan University, 2009], well below Betz limiting value (power coefficient theoretical peak be 0.593) [Su Shaoyu. wind-driven generator design and operation maintenance [M]. Beijing: China Electric Power Publishing House, 2003].The construction that simultaneously China has a large population and a few land, wind resource skewness, the uneven in development fundamental realities of the country of the western and eastern make the Large-scale Wind Turbines power station, use and generate electricity by way of merging two or more grid systems and all have significant limitation.But if the size that reduces wind turbine can reduce the efficient of wind-power electricity generation again greatly, this family oriented to wind-power electricity generation, miniaturization, to use from networking be disadvantageous.
Summary of the invention
The purpose of this utility model is problems such as conventional small wind-driven generator wind energy utilization is low, generated energy is little, poor practicability, family oriented difficulty in order to have solved, and provides a kind of bilobed wheel of small-sized wind power generator that is applicable to changeing wind wheel structure.
A kind of bilobed wheel that is applicable to small-sized wind power generator is characterized in that changeing wind wheel structure, comprises first order impeller, second level impeller, bearing bracket, first order axle bearing, first order axle, second level axle, second level axle bearing;
First order impeller is installed on the first order axle, and second level impeller is installed on the axle of the second level, second level axle hollow, inside is provided with first order axle bearing, first order axle feeds in the axle of the second level along axle axle center, the second level, and first order axle is concentric with second level axle, and second level axle is installed on the axle bearing of the second level;
Second level axle bearing is fixed by bearing bracket;
Transmission device is installed on first order axle and the second level axle to link to each other with generator separately.
The invention has the advantages that:
(1) promoted the wind energy utilization of single cover wind power plant wind wheel system greatly, under the constant prerequisite of impeller size, wind energy utilization reaches more than 1.5 times of traditional single shaft single impeller wind-driven generator;
(2) improved the generating total amount of single cover small-size wind power-generating equipment greatly.The lifting of generating total amount is the lifting of benefiting from wind wheel system efficient on the one hand, then be because bilobed wheel makes wind power plant stable electric generation ability under mal-condition (excessive as wind speed) promote greatly to rotation structure on the other hand, thereby prolonged the effective time;
(3) greatly reduce the difficulty of wind-power electricity generation miniaturization, family oriented, making every household use wind-power electricity generation becomes possibility.This is that original production line of need not upgrading need not increase too high design and cost of production yet and can realize technical innovation because the utility model only needs to make improvements slightly on the conventional small wind power plant.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the local scheme of installation of first order impeller among the utility model Fig. 1, second level impeller;
Fig. 3 is the size schematic representation of the utility model first order impeller, second level impeller;
Fig. 4 is the schematic representation of blade angle in the utility model first order impeller, the second level impeller;
Among the figure:
1-first order impeller 2-second level impeller 3-bearing bracket
4-first order axle bearing 5-first order axle 6-second level axle
7-second level axle bearing
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
The utility model is problems such as conventional small wind-driven generator wind energy utilization is low, generated energy is little, poor practicability, family oriented difficulty in order to have solved, the technical solution of the utility model adopts the coaxial birotor bilobed wheel that rotation structure is substituted conventional small wind-driven generator single shaft single rotor single impeller structure, be coupled by the flow field between both stage impellers, first order impeller is being made full use of on the basis of wind energy power, also become the air-intake guide vane and the straightener(stator) blade of second level impeller.Second level impeller is coaxial with first order impeller, oppositely to changeing, make second level impeller blade inlet flow field (can both reach optimum Wind Power Utilization condition (optimum angle of attack, optimum fluidised form) in the 5m/s~12m/s) in wind-power electricity generation wind speed range commonly used, the efficient of effectively having avoided causing because of the too high stall of local wind speed or flow separation reduces, thereby has promoted the complete machine wind energy utilization.
A kind of bilobed wheel of small-sized wind power generator that is applicable to of the present utility model is to changeing wind wheel structure, as shown in Figure 1, comprise first order impeller 1, second level impeller 2, bearing bracket 3, first order axle bearing 4, first order axle 5, second level axle 6, second level axle bearing 7.
First order impeller 1 is installed on the first order axle 5, second level impeller 2 is installed on the second level axle 6, second level axle 6 hollows, internal diameter is slightly larger than first order axle 5 external diameters, in 6 on the second level axle first order axle bearing 4 is housed, first order axle 5 can be fed in the second level axle 6 along second level axle 6 axle center, and first order axle 5 is concentric with second level axle 6, and can do independence, freely rotates.Second level axle 6 is installed on the second level axle bearing 7, also can do independently, freely rotate;
First order impeller 1 is arranged front and back at a certain distance with second level impeller 2, at first flow through first order impeller 1 blade and drive first order impeller 1 and rotate of air-flow, airflow direction behind the first order of the flowing through impeller 1 deflects, and the second level impeller 2 of flowing through, second level impeller 2 blades and first order impeller 1 blade are oppositely installed, make second level impeller 2 and first order impeller 1 coaxial, oppositely to changeing;
Second level axle bearing 7 is fixing by bearing bracket 3;
Transmission device is installed on first order axle 5 and the second level axle 6 to link to each other with generator separately.
In the utility model the axle that changes the wind wheel both stage impellers is adopted the coaxial birotor structure, first order axle 5 is thinner solid shaft, and wheelbase is longer, and second level axle 6 is thicker hollow shaft, and wheelbase is shorter.The external diameter of first order axle 5 is slightly less than the internal diameter of second level axle 6, pass from the axle center of second level axle 6, during assembling, every axle is by supporting in pairs ball bearing supporting, first order axle bearing 4 second level axle bearing 7 both sides that are placed in, one of them is installed in the wheel hub of second level impeller 2, another is installed on the rear end (fixing by bearing bracket) of second level axle 6, spatial position by first order axle bearing 4, second level axle bearing 7 guarantees that two axles are concentric, make diaxon can be independently, rotate freely.First order impeller 1, second level impeller 2 all adopt and are threaded with first order axle 5, second level axle 6, the impeller sense of rotation is identical with thread rotary orientation to prevent that wind wheel and axle break away from, simultaneously open tapped hole, radially install clamping bolt additional in first order impeller 1, second level impeller 2 bases.Every axle drives a generator job, and generator is fixed on the bearing bracket 3, by synchronous belt drive.
As shown in Figure 3, the outer warp of first order impeller 1 is R1, and the external diameter of second level impeller 2 is R2, and the external diameter R2 of second impeller 2 is bigger, is approximately 1~1.5 times of external diameter R1 of first impeller 1.Installing space L between first order impeller 1 and the second level impeller 2 is adjustable according to the impeller design parameter.
In Fig. 4, the established angle of first order impeller 1 blade is α, and the established angle of second level impeller 2 blades is β, and first order impeller 1 and second level impeller 2 be arranged concentric one in front and one in back, and first order impeller 1 is opposite with second level impeller 2 upper blade established angles.For just, the established angle α of first order impeller 1 upper blade is 25~35 degree with counterclockwise, and the established angle β of second level impeller 2 upper blades-15~-25 spends.
Working principle and process:
Bilobed wheel of the present utility model when changeing wind wheel structure work, at first flow through first order impeller 1 blade and drive first order impeller 1 and rotate of incoming flow, first order impeller 1 drives generator for electricity generation by first order axle 5 output shaft works.Working procedure that this is a part of and traditional wind are identical.
Incoming flow is behind the first order impeller 1 of flowing through, and the kinetic energy of loss is converted into the shaft work on the first order axle 5, sends electric energy, and follows a small amount of mobile loss that causes with mechanical friction.But limited because of single-stage turbine size, the number of blade is less, rotating speed is lower, the wind energy transformation rate is also lower, air-flow still has the higher kinetic energy can be for utilizing behind the first order impeller 1 of flowing through.But air-flow is behind the first order impeller 1 of flowing through, and obvious deflection will take place airflow direction.For making full use of the airflow kinetic energy that flows to after the deflection, impeller 2 blade angle β in the second level are opposite with first order impeller 1 blade angle α, and determine that through accurate Calculation its established angle number of degrees absolute value should be slightly less than first order impeller 1 blade angle number of degrees absolute value.Like this, the air-flow after the deflection again can be with the best angle of attack second level impeller 2 of flowing through, make second level impeller 2 and first order impeller 1 coaxial, oppositely to changeing, drive second level axle 6 and rotate, and drive another generator for electricity generation.This process has more effectively been utilized the kinetic energy that passes through unit cross section air-flow than single-stage wind wheel, has reduced the waste of wind energy on the unit cross section, has significantly improved wind energy utilization.
Simultaneously, variation to a certain degree will take place in the air-flow behind the first order of the flowing through impeller 1 on fluidised form.Originally the not high air-flow of turbulivity will become the high turbulence air-flow, and be attended by from the whirlpool of first order impeller 1 blade trailing edge disengaging, wherein high turbulent flow is moving can to strengthen the gas transport ability, the flow separation that effectively suppresses second level impeller 2 blade trailing edges, and will be coupled with impeller 2 blade inlet edges in the second level are mobile from the whirlpool that first order impeller 1 blade trailing edge comes off, by the spacing L of appropriate design aerofoil profile and two impellers, these two kinds of pneumatic action can improve the acting ability of specific discharge air-flow greatly.
In addition, first order impeller 1 diameter R1 is slightly less than the diameter R2 of second level impeller 2, and the part air-flow directly blows to second level impeller 2 blade tip sections without first order impeller 1, has guaranteed that second level impeller has good startability.At wind-force hour, second level impeller still can effectively utilize wind energy output shaft work, and when wind-force is big, first order impeller is because turning radius is less, be subjected to big wind effect less, generated energy promotes, and the high speed incoming flow is played rectified action, second level impeller also can be under the good operating mode all the time work.
The utility model only needs to get final product proper functioning by the Installation and Debugging of traditional wind Installation and Debugging method in actual use.Be installed in building exterior wall, house top layer, street lamp top by support and all can realize round-the-clock high efficiency generating, one day normal power generation amount of a typhoon machine can satisfy ordinary family need for electricity on the same day, reaches the effect of energy-saving and emission-reduction.
Embodiment:
Adopt a kind of bilobed wheel that is applicable to small-sized wind power generator of the present utility model to changeing wind wheel structure, carry out blasting research, the incoming flow wind speed is got 7m/s, 8m/s, 9m/s and 10m/s respectively.Measure same design size (identical aerofoil profile, identical maximum turning radius) single-wheel wind wheel structure respectively and, obtain experimental result such as following table changeing the wind wheel structure output power:
Table 1 experiment structure
By table 1 as seen, bilobed wheel of the present utility model is compared conventional single impeller wind wheel structure to changeing wind wheel structure under medium wind conditions, and at least 40% lifting is arranged aspect wind energy utilization.

Claims (7)

1. a bilobed wheel that is applicable to small-sized wind power generator is to changeing wind wheel structure, it is characterized in that, comprise first order impeller (1), second level impeller (2), bearing bracket (3), first order axle bearing (4), first order axle (5), second level axle (6), second level axle bearing (7);
First order impeller (1) is installed on the first order axle (5), second level impeller (2) is installed on the second level axle (6), second level axle (6) hollow, inside is provided with first order axle bearing (4), first order axle (5) feeds in the second level axle (6) along second level axle (6) axle center, first order axle (5) is concentric with second level axle (6), and second level axle (6) is installed on the second level axle bearing (7);
Second level axle bearing (7) is fixing by bearing bracket (3);
Transmission device is installed on first order axle (5) and the second level axle (6) to link to each other with generator separately.
2. a kind of bilobed wheel of small-sized wind power generator that is applicable to according to claim 1 is to changeing wind wheel structure, it is characterized in that, described first order axle bearing (4) places second level axle bearing (7) both sides respectively, one of them is installed in the wheel hub of second level impeller (2), and another is installed on the rear end of second level axle (6).
3. a kind of bilobed wheel of small-sized wind power generator that is applicable to according to claim 1 is to changeing wind wheel structure, it is characterized in that, described first order impeller (1) adopts respectively with second level axle (6) with first order axle (5), second level impeller (2) and is threaded, and the impeller sense of rotation is identical with thread rotary orientation.
4. a kind of bilobed wheel that is applicable to small-sized wind power generator according to claim 1 is characterized in that to changeing wind wheel structure the outer warp of described first order impeller (1) is R1, and the external diameter of second level impeller (2) is R2, R2>R1.
5. a kind of bilobed wheel that is applicable to small-sized wind power generator according to claim 4 is characterized in that to changeing wind wheel structure described R2 is 1~1.5 times of R1.
6. a kind of bilobed wheel that is applicable to small-sized wind power generator according to claim 1 is characterized in that to changeing wind wheel structure the blade of the blade of described first order impeller (1) and second level impeller (2) is oppositely installed.
7. a kind of bilobed wheel of small-sized wind power generator that is applicable to according to claim 6 is to changeing wind wheel structure, it is characterized in that, the blade angle of described first order impeller (1) is α, the blade angle of second level impeller (2) is β, if counterclockwise for just, the established angle α of first order impeller (1) upper blade is 25~35 degree, and the established angle β of second level impeller (2) upper blade is-15~-25 degree.
CN2013201388689U 2013-03-25 2013-03-25 Counter-rotating double-impeller wind turbine structure suitable for minitype wind generator Expired - Fee Related CN203098139U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013201388689U CN203098139U (en) 2013-03-25 2013-03-25 Counter-rotating double-impeller wind turbine structure suitable for minitype wind generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013201388689U CN203098139U (en) 2013-03-25 2013-03-25 Counter-rotating double-impeller wind turbine structure suitable for minitype wind generator

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106609826A (en) * 2015-10-27 2017-05-03 熵零控股股份有限公司 Power transmission unit
CN109306936A (en) * 2018-06-05 2019-02-05 太仓新宏电子科技有限公司 A kind of new energy efficient wind power generation method
CN109757053A (en) * 2017-11-08 2019-05-14 鄂尔多斯市煤炭交易中心有限公司 A kind of data center machine room system
CN110905728A (en) * 2019-12-04 2020-03-24 沈阳航空航天大学 Supercharged horizontal shaft wind turbine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106609826A (en) * 2015-10-27 2017-05-03 熵零控股股份有限公司 Power transmission unit
CN109757053A (en) * 2017-11-08 2019-05-14 鄂尔多斯市煤炭交易中心有限公司 A kind of data center machine room system
CN109757053B (en) * 2017-11-08 2020-08-14 鄂尔多斯市煤炭交易中心有限公司 Data center machine room system
CN109306936A (en) * 2018-06-05 2019-02-05 太仓新宏电子科技有限公司 A kind of new energy efficient wind power generation method
CN110905728A (en) * 2019-12-04 2020-03-24 沈阳航空航天大学 Supercharged horizontal shaft wind turbine

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C17 Cessation of patent right
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Granted publication date: 20130731

Termination date: 20140325