CN102748247A - Blade of wind driven generator with speed capable of being adjusted passively - Google Patents
Blade of wind driven generator with speed capable of being adjusted passively Download PDFInfo
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- CN102748247A CN102748247A CN2012102537106A CN201210253710A CN102748247A CN 102748247 A CN102748247 A CN 102748247A CN 2012102537106 A CN2012102537106 A CN 2012102537106A CN 201210253710 A CN201210253710 A CN 201210253710A CN 102748247 A CN102748247 A CN 102748247A
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- blade
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- driven generator
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a blade of a wind driven generator with the speed capable of being adjusted passively. The blade comprises a windward side and a leeside, air cavities are respectively arranged on the windward side and the leeside and are connected through an airflow channel, a pneumatic overflow valve is arranged in the airflow channel, a cover is arranged outside each air cavity, a through hole is processed on each cover, each cover is made of a metal sheet, the aperture of each through hole is smaller than or equal to the thickness of each cover, and the overflow pressure of the pneumatic overflow valve is preset as pressure difference of the air pressure of the windward side and the air pressure of the leeside when at rated wind speed. The blade of the wind driven generator has the advantages of simple structure, low cost, high reliability and the like, in a total running process of a wind turbine, the rotation speed of the wind driven generator can be adjusted automatically according to wind speed, so that a wind wheel keeps rotating at rated rotation speed, and unbalanced load on the wind wheel of the wind driven generator can be eliminated. The blade overcomes the shortcomings of the complex structure of the traditional pitch-variable blade and difficulty in control of a stall type blade after the stall type blade stalls.
Description
Affiliated technical field
The present invention relates to technical field of wind power generating equipment, relate in particular to the blade of wind-driven generator of the passive speed governing of a kind of ability.
Background technique
Along with the aggravation of the energy and environmental crisis, " new energy " of green non-pollutions such as solar energy, wind energy, geothermal power and ocean ocean current more and more come into one's own.China's wind-powered electricity generation resources reserve is abundant, and the wind energy conversion system manufacturing technology is also more and more ripe, and in order to improve the reliability of unit, multiple advanced technology is applied in the modern wind machine.The blade of wind-driven generator is the critical piece that wind-driven generator obtains aerodynamic energy, and the lift that the air pressure difference of blade windward side and lee face produces is to promote wind wheel to rotate the power that produces power.Realize that through the aeroelasticity characteristic that changes blade passive speed governing once was the power control mode that generally adopts in the past, main representative is the Stall Type blade of wind-driven generator.The working procedure of Stall Type blade of wind-driven generator is following: when wind speed surpassed rated wind speed, the stall effect can take place in blade, and lift coefficient can reduce, and resistance coefficient can increase, thereby wind speed round is not increased with the increase of wind speed.Its defective is; The Stall Type wind energy conversion system is after arriving stall conditions; The aerodynamic characteristic of blade has uncertainty; This uncertainty can cause rated wind speed or more during high wind speed the mistake to power level and blade loading estimate, cause the instability of output power and the fatigue damage of unit, so the Stall Type blade is replaced by active variable-pitch type blade gradually in recent years.It is to drive pulp distance varying mechanism through power mechanism to change the angle that blade facings the wind that active change oar is regulated, thereby changes the lift resistance ratios of blade, makes impeller when rated wind speed is above, still can keep rated speed constant.Generally adopt the feather mode that Driven by Hydraulic Cylinder mode and motor drive mode are arranged now; Under current technical specifications; Realization is relatively easy with the feather control of upper type, but initiatively the variable-pitch type blade needs power source, corresponding mechanical structure and control system, its complex structure; Be in operation and break down easily, manufacturing and maintenance cost are higher.The external corresponding research that the change oar speed governing of pair passive type is also arranged, this mode has reduced power source, but still needs extra mechanical structure.
Summary of the invention
The object of the invention is exactly in order to solve problems such as the active variable-pitch type blade structure complicacy that existing technology exists, operational reliability difference and manufacturing maintenance cost height; The blade of wind-driven generator of the passive speed governing of a kind of ability is provided; Has simple in structure, with low cost, reliability advantages of higher; In the whole service process of wind energy conversion system; Blade can be regulated the rotating speed of wind-driven generator automatically according to the size of wind speed, makes wind speed round maintain rated speed, and can eliminate the unbalanced load on the wind turbines rotor.This blade overcomes unmanageable shortcoming behind the complicated and Stall Type blade stall of traditional variable pitch type blade structure.
To achieve these goals, the present invention adopts following technological scheme:
The blade of wind-driven generator of the passive speed governing of a kind of ability, blade comprises windward side and lee face, is respectively equipped with air cavity on windward side and the lee face, the windward side is connected through air-flow path with air cavity on the lee face, is provided with the actuated overflow valve in the air-flow path.
Outside at air cavity is provided with covering, is processed with through hole on the covering.
Covering adopts sheetmetal or composite material.
The thickness of the aperture≤covering of through hole.
The pressure reduction of the air pressure of windward side and lee face air pressure when the oil pressure relief of actuated overflow valve is preset as rated wind speed.
Working principle: the present invention includes windward side and lee face; Be respectively equipped with air cavity on windward side and the lee face; The windward side is connected through air-flow path with air cavity on the lee face; Be provided with the actuated overflow valve in the air-flow path, the pressure reduction of the air pressure of windward side and lee face air pressure when the oil pressure relief of actuated overflow valve is preset as rated wind speed.Outside at air cavity is provided with covering, processes through hole on the covering, and covering adopts metallic sheet stock, the thickness of the aperture≤covering of through hole.The inlet pressure of actuated overflow valve is a windward side pressure, and outlet pressure is a lee face pressure, the air pressure difference on two sides when oil pressure relief is rated wind speed.At wind speed hour, the pressure reduction on two sides does not reach the oil pressure relief of relief valve, and valve keeps blocked state, and the lift of blade is followed wind speed and changed.After wind speed surpassed rated wind speed, the pressure reduction on two sides reached the oil pressure relief of relief valve, and relief valve is opened; Air between two faces goes into circulation; The pressure reduction on two sides reduces accordingly, and the pressure difference up to the two sides reduces the preset pressure up to relief valve, and relief valve cuts out.Through the break-make of relief valve, can make two pressure differences between the face maintain steady state value, even also the lift of blade maintains steady state value.Adopt this blade can make the rotating speed of wind wheel when rated wind speed is above, maintain rated speed, also can realize elimination simultaneously the wind energy conversion system unbalanced load.
Beneficial effect of the present invention:
1. simple in structure, with low cost, reliability is high, in the whole service process of wind energy conversion system, blade can automatically be regulated the rotating speed of wind-driven generator according to the size of wind speed, make wind speed round maintain rated speed;
2. can eliminate the unbalanced load on the wind turbines rotor, overcome unmanageable shortcoming behind the complicated and Stall Type blade stall of traditional variable pitch type blade structure.
Description of drawings
Fig. 1 is the plan view of the windward side of blade;
Fig. 2 is the plan view of the lee face of blade;
Fig. 3 is the structural drawing of rigidity covering;
Fig. 4 is the A-A cross section of blade;
Fig. 5 is the pressure distribution of blade surface;
Fig. 6 is rated wind speed when above, starts relief valve and opens the inside and outside air stream cardon of rear blade;
Among the figure, 1 blade, 2 coverings, 3 through holes, 4. actuated overflow valve, 5 air cavitys, 6 windward sides, 7 lee faces, 8. air-flow path.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
The blade of wind-driven generator of the passive speed governing of a kind of ability; To shown in Figure 6, blade 1 comprises windward side 6 and lee face 7 like Fig. 1, is respectively equipped with air cavity 5 on windward side 6 and the lee face 7; The windward side is connected through air-flow path 8 with air cavity 5 on the lee face, is provided with actuated overflow valve 4 in the air-flow path 8.Be provided with covering 2 in the outside of air cavity 5, be processed with through hole 3 on the covering 2.Covering 2 adopts metallic sheet stock.The thickness of the aperture≤covering of through hole 3.The pressure reduction of the air pressure of windward side 6 and lee face 7 air pressures when the oil pressure relief of actuated overflow valve 4 is preset as rated wind speed.Fig. 5 is the pressure distribution on wind energy conversion system working state lower blade two sides, and the air pressure of establishing the windward side is positive pressure P+, and lee face pressure is negative pressure P-, and in general, the absolute value of P-is greater than P+.The pressure reduction P=|P+|+|P-| on blade both sides produces the lift that promotes blade rotation, and the size that changes P can change the size of lift.
The working procedure of actuated overflow valve 4 is following: the inlet pressure of valve is windward side air pressure P+, and outlet pressure is lee face air pressure P-, the pressure reduction P on two sides when oil pressure relief is preset as rated wind speed
e, when rated wind speed is following, the pressure reduction P on both sides<p
e, relief valve is a blocking state; When rated wind speed is above, the pressure reduction P > on both sides; P
e, relief valve is opened.
The concrete working procedure of blade is following: blade 1 inner air cavity 5 is communicated with the windward side and the lee face of blades, and the outer surface of air cavity covers the rigidity covering 2 of porous.Set inside actuated overflow valve 4 blocking-up of air cavity, the oil pressure relief P of actuated overflow valve
eThe pressure difference on two sides during for rated wind speed.When rated wind speed was following, the pressure reduction of air windward side and lee face was P
1<p
e, the actuated overflow valve keeps blocking state, and the windward side and the lee face of blade do not have air ventilation, the air pressure difference P on two faces
1Do not change, self airmechanics characteristic of blade does not change, and rotating speed increases with the increase of wind speed; After wind speed surpassed rated wind speed, because the air pressure difference between windward side and the lee face becomes big, this moment, pressure reduction was P
2, P
2>P
eActuated overflow valve 4 in the pressure chamber is opened; Air begins to flow to low pressure area through air cavity by the zone of high pressure, and it is constant that the pressure difference between blade windward side and the lee face keeps, and the lift of blade maintains steady state value; And then making wind speed round maintain rated speed, the lift of this mode is regulated and can also be eliminated the uneven air load that acts on the wind wheel simultaneously.This blade can be passive change self airmechanics characteristic according to wind speed, keeps constant lift, the wind-driven generator rotating speed is maintained near the rated speed, eliminate the unbalanced load of wind-driven generator, the passive speed governing of realization wind energy conversion system.
Though the above-mentioned accompanying drawing that combines is described the embodiment of invention; But be not restriction to protection domain of the present invention; One of ordinary skill in the art should be understood that; On the basis of technological scheme of the present invention, those skilled in the art need not pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (5)
1. the blade of wind-driven generator of the passive speed governing of ability; Blade comprises windward side and lee face, it is characterized in that, is respectively equipped with air cavity on windward side and the lee face; The windward side is connected through air-flow path with air cavity on the lee face, is provided with the actuated overflow valve in the air-flow path.
2. the blade of wind-driven generator of the passive speed governing of ability as claimed in claim 1 is characterized in that, said outside at air cavity is provided with covering, and covering is provided with through hole.
3. the blade of wind-driven generator of the passive speed governing of ability as claimed in claim 2 is characterized in that, said covering adopts sheetmetal or composite material.
4. the blade of wind-driven generator of the passive speed governing of ability as claimed in claim 2 is characterized in that, the thickness of the aperture≤covering of said through hole.
5. the blade of wind-driven generator of the passive speed governing of ability as claimed in claim 1 is characterized in that, the pressure reduction of the air pressure of windward side and lee face air pressure when the oil pressure relief of said actuated overflow valve is preset as rated wind speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102537106A CN102748247A (en) | 2012-07-21 | 2012-07-21 | Blade of wind driven generator with speed capable of being adjusted passively |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102537106A CN102748247A (en) | 2012-07-21 | 2012-07-21 | Blade of wind driven generator with speed capable of being adjusted passively |
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| CN102748247A true CN102748247A (en) | 2012-10-24 |
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| CN2012102537106A Pending CN102748247A (en) | 2012-07-21 | 2012-07-21 | Blade of wind driven generator with speed capable of being adjusted passively |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734577A (en) * | 2020-07-07 | 2020-10-02 | 中国华能集团有限公司广西分公司 | Slotted wind turbine blade device and slotting method |
| CN113048008A (en) * | 2019-12-27 | 2021-06-29 | 江苏金风科技有限公司 | Blade, load adjusting assembly, wind generating set and load adjusting method |
| CN113107766A (en) * | 2021-05-24 | 2021-07-13 | 国网内蒙古东部电力有限公司呼伦贝尔供电公司 | Wind wheel with vertically arranged rotating shaft and wind driven generator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042162A (en) * | 2009-10-19 | 2011-05-04 | 联合船舶设计发展中心 | Pressure relief device |
| CN102094750A (en) * | 2011-01-26 | 2011-06-15 | 杭州广联新能源科技有限公司 | Blade overflow hole of magnetic suspension savonius rotor wind driven generator |
| CN102588205A (en) * | 2011-01-04 | 2012-07-18 | 通用电气公司 | System and method of manipulating a boundary layer across a rotor blade of a wind turbine |
| CN202690335U (en) * | 2012-07-21 | 2013-01-23 | 济南轨道交通装备有限责任公司 | Wind-driven generator blade capable of passively regulating speed |
-
2012
- 2012-07-21 CN CN2012102537106A patent/CN102748247A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042162A (en) * | 2009-10-19 | 2011-05-04 | 联合船舶设计发展中心 | Pressure relief device |
| CN102588205A (en) * | 2011-01-04 | 2012-07-18 | 通用电气公司 | System and method of manipulating a boundary layer across a rotor blade of a wind turbine |
| CN102094750A (en) * | 2011-01-26 | 2011-06-15 | 杭州广联新能源科技有限公司 | Blade overflow hole of magnetic suspension savonius rotor wind driven generator |
| CN202690335U (en) * | 2012-07-21 | 2013-01-23 | 济南轨道交通装备有限责任公司 | Wind-driven generator blade capable of passively regulating speed |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048008A (en) * | 2019-12-27 | 2021-06-29 | 江苏金风科技有限公司 | Blade, load adjusting assembly, wind generating set and load adjusting method |
| CN113048008B (en) * | 2019-12-27 | 2023-06-13 | 江苏金风科技有限公司 | Blade, load adjusting assembly, wind generating set and load adjusting method |
| CN111734577A (en) * | 2020-07-07 | 2020-10-02 | 中国华能集团有限公司广西分公司 | Slotted wind turbine blade device and slotting method |
| CN111734577B (en) * | 2020-07-07 | 2023-05-02 | 中国华能集团有限公司广西分公司 | Slit type wind turbine blade device and slit method |
| CN113107766A (en) * | 2021-05-24 | 2021-07-13 | 国网内蒙古东部电力有限公司呼伦贝尔供电公司 | Wind wheel with vertically arranged rotating shaft and wind driven generator |
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Application publication date: 20121024 |