CN102734067B - Wind thrust pitch-variable mechanism - Google Patents

Wind thrust pitch-variable mechanism Download PDF

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Publication number
CN102734067B
CN102734067B CN201210235673.6A CN201210235673A CN102734067B CN 102734067 B CN102734067 B CN 102734067B CN 201210235673 A CN201210235673 A CN 201210235673A CN 102734067 B CN102734067 B CN 102734067B
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China
Prior art keywords
wind
wind wheel
pitch
thrust
mandrel
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Expired - Fee Related
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CN201210235673.6A
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Chinese (zh)
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CN102734067A (en
Inventor
王国力
刘衍选
蔡晓峰
赵炳胜
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Shenyang China Creative Wind Energy Co Ltd
China Creative Wind Energy Co Ltd
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Shenyang China Creative Wind Energy Co Ltd
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Priority to CN201210235673.6A priority Critical patent/CN102734067B/en
Publication of CN102734067A publication Critical patent/CN102734067A/en
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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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Abstract

The invention relates to a wind thrust pitch-variable mechanism which belongs to the technical field of wind power generation. The wind thrust pitch-variable mechanism comprises a wind wheel spindle, a wind wheel shaft sleeve, a pitch-variable bearing, at least two sets of hydraulic thrust cylinders and a pitch-variable hydraulic drive cylinder, wherein one end of the wind wheel spindle is connected with a main shaft of an engine, and the other end of the wind wheel spindle is provided with a gland; the wind wheel shaft sleeve is sheathed on the wind wheel spindle, and an end spring is arranged between the end part of the wind wheel shaft sleeve and the gland; the pitch-variable bearing is arranged at the outside of the wind wheel spindle through a bearing pedestal, the outer circle of the pitch-variable bearing is fixed on the pitch-variable bearing pedestal, and blades are fixed on the inner circle of the pitch-variable bearing; the at least two sets of hydraulic thrust cylinders are uniformly distributed at the periphery of the wind wheel spindle after being connected in series, and are fixed on a fixed seat outside the spindle, and the end parts of the piston rods of the hydraulic thrust cylinders are connected with the end surface of the wind wheel shaft sleeve; and the pitch-variable hydraulic drive cylinder is fixed on the pitch-variable bearing pedestal through a rotatable pin, and the pitch-variable hydraulic drive cylinder and the hydraulic thrust cylinder are connected with a nonmetal hydraulic pipeline. According to the invention, the communication between the wind thrust pitch-variable mechanism and a cabin is established in no need of a hub and intervention of a manual or control system, and totally depends on wind power without extra motive power; and a slide ring is omitted in the wind thrust pitch-variable mechanism.

Description

Wind-force thrust blade pitch device
technical field
The invention belongs to technical field of wind power generation, particularly relate to a kind of mechanism that relies on the thrust independent pitch of wind-force self generation.
Background technique
Large-scale Wind Turbines is on power is controlled at present, general change oar form or the hydraulic vane change form that adopts motor reducer actuation gear mechanism, this blade pitch device need to be placed into blade pitch device in wheel hub, controls by electric slip ring or fluid power slip ring and Nacelle control system communication simultaneously.And small-sized wind power generator group has at present wind wheel lateral deviation speed regulation method in the control of reply power, utilize impeller centrifugal force to change pitch, increase the means such as blade resistance.Electronic and hydraulic vane change mechanism all needs the intervention of artificial or control system just can work, and owing to adopting slip ring structure, so its structure and operate all more complicated.The change rower section effect that small-sized fan adopts is not at present ideal.And traditional wind-driven generator has only utilized the effect of wind energy to blade lift, be used for generating electricity; And wind energy is not utilized the part of blade thrust.
Summary of the invention
Technical problem for above-mentioned existence, the invention provides a kind of wind-force thrust blade pitch device, it is not need wheel hub and cabin to set up communicate by letter, omit slip ring, does not also need manually or control system intervention, and relies on wind-force completely and do not need the blade pitch device of extra power.
The present invention includes:
Wind wheel mandrel, one end connects generator shaft, and the other end is provided with gland;
Wind wheel axle sleeve is sleeved on wind wheel mandrel, is provided with end spring between wind wheel sleeve end and gland;
Pitch variable bearings, is arranged on wind wheel mandrel outside by its bearing support, and the outer ring of pitch variable bearings is fixed on pitch variable bearings seat, and blade is fixed on the inner ring of pitch variable bearings;
Thrust oil hydraulic cylinder, is at least two groups, is distributed in wind wheel mandrel periphery after being connected in series, and is fixed on the fixed base in mandrel outside, and the piston rod end of thrust oil hydraulic cylinder is connected with wind wheel end face of shaft bush;
Become oar and drive oil hydraulic cylinder, by rotatable pin, be fixed on pitch variable bearings seat, become oar and drive between oil hydraulic cylinder and thrust oil hydraulic cylinder and be connected by nonmetal hydraulic pipe line.
Described main shaft is that generator rotor shaft stretches out generator casing, and its end is with the flange arrangement being connected with wind wheel mandrel.Or described main shaft is one end with the flange arrangement being connected with wind wheel mandrel, the structure of the other end for being connected with generator rotor shaft.
The flange arrangement of described wind wheel mandrel one end for being connected with main shaft, the other end is with the mounting hole being connected with gland, and mandrel axis body and wind wheel axle sleeve are connected partly with fin, and rotor shaft cover is with the endoporus matching with mandrel fin.
Described thrust oil hydraulic cylinder is the oil hydraulic cylinder that band resets.Its reset thrust minimum value is rated wind speed Vn.
Between described mandrel and pitch variable bearings seat, by muscle structure, link together.Or, between described mandrel and pitch variable bearings seat, by the hub structure with muscle structure, link together.
Beneficial effect of the present invention:
Adopt blade pitch device of the present invention, it does not need wheel hub and cabin to set up communicate by letter, omit slip ring, do not need manually or control system intervention yet, relies on wind-force completely and does not need extra power.The present invention is particularly useful for small-sized fan, and cost is lower and simple in structure.
The present invention has utilized wind energy to another effect outside blade lift effect, and thrust is carried out the relation at associated blade pitch angle, thereby realize, utilizes wind energy power and becomes oar.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the structural representation of Fig. 1 apoplexy wheel mandrel.
Fig. 3 is the structural representation of Fig. 1 Intermediate shaft sleeve.
Fig. 4 is that the present invention becomes oar driving structure schematic diagram.
Fig. 5 is working principle schematic diagram of the present invention, wherein: figure a-figure c is the variation relation of blade each parameter value under wind-force effect, the power curve that figure d is fan design.
In figure: 1, tower cylinder, 2, cabin, 3, main shaft, 4, mandrel, 41, fin, 5, thrust oil hydraulic cylinder, 51, fixed base, 6, axle sleeve, 7, become oar and drive oil hydraulic cylinder, 71, pin, 72, connecting pin, 8, blade, 9, pitch variable bearings, 10, end face spring, 11, gland, 12, link, 13. hubs.
Embodiment
Below in conjunction with drawings and Examples, specifically describe the present invention.
Embodiment: as shown in Figure 1, the present invention includes:
Wind wheel mandrel 4, one end connects generator shaft 3, and both connecting ends are the flange plate structure cooperatively interacting, the other end is provided with gland 11 by bolt, mandrel 4 axis bodies and wind wheel axle sleeve 6 are connected part with fin, are at least one (this example is with four fins), are uniformly distributed along the circumference; Wind wheel mandrel 4 is the devices that function is identical with slip coupling, both can slide vertically, can transmit the moment of torsion of low speed rotation simultaneously;
Wind wheel axle sleeve 6, with the endoporus matching with mandrel 4 fins, is sleeved on wind wheel mandrel 4, in wind wheel axle sleeve 6 ends and 11, gland, is provided with end spring 10, and end spring 10 and gland 11 are bolted on wind wheel mandrel 4 end faces;
Pitch variable bearings 9, is arranged on wind wheel mandrel 4 outsides by its bearing support, between described mandrel 4 and pitch variable bearings seat, by the hub structure with muscle structure, links together; The outer ring of pitch variable bearings 9 is bolted on pitch variable bearings seat, and blade 8 is bolted on the inner ring of pitch variable bearings 9;
Thrust oil hydraulic cylinder 5 is oil hydraulic cylinders that band resets, be at least two groups (this example is two groups), after being connected in series, be distributed in wind wheel mandrel 4 peripheries, be fixed on the fixed base 51 in mandrel 4 outsides, the piston rod end of thrust oil hydraulic cylinder 5 is connected with wind wheel axle sleeve 6 end faces by bolt;
Become oar and drive oil hydraulic cylinder 7, by rotatable connecting pin 72, be connected on the hub 13 with muscle structure, becoming oar drives piston rod one end of oil hydraulic cylinder 7 to be connected on link 12 by another rotatable pin 71, link 12 is fixed on the inner ring of pitch variable bearings 9, the outer ring of pitch variable bearings 9 is fixed on the hub 13 with muscle structure, becomes oar and drives oil hydraulic cylinder 7 to be connected by nonmetal hydraulic pipe line with 5 of thrust oil hydraulic cylinders.
Main shaft 3 described in the present invention is that generator rotor shaft stretches out generator casing, and its end is with the flange arrangement being connected with wind wheel mandrel 4.Also can adopt another kind of structure: described main shaft 3 is for one end is with the flange arrangement being connected with wind wheel mandrel 4, and the other end is for coordinating the structure being in transmission connection with generator rotor shaft.Described thrust oil hydraulic cylinder 5 is oil hydraulic cylinders that band resets.
Working principle of the present invention:
The elasticity coefficient of thrust oil hydraulic cylinder 5 built-in springs and volume, the stroke of two thrust hydraulic pressure 5 cylinders that in the present invention, band resets all need and the aerodynamic characteristics of blade and the associated design of the propeller pitch angle scope of blade pitch device of the present invention.
As schemed in Fig. 5 as shown in a, when atmosphere and the following motion of vane airfoil profile existence, vane airfoil profile will be subject to the δ Q that makes a concerted effort, and δ Q, perpendicular to coming the component fL of flow path direction to be called lift, is being parallel to come the component fD of flow path direction to be called resistance.Thereby whole wind wheel is subject to air effect power perpendicular to coming the Σ fL that makes a concerted effort of flow path direction to drive generator amature generating by producing each torque around the rotation of wind wheel axis, and will produces a thrust vertically and be delivered on blower foundation by tower cylinder along the component Σ fD that carrys out flow path direction.In figure b, α is the angle of attack, and β is propeller pitch angle, and ω is wind vector.In the constant situation of propeller pitch angle β, along with increasing angle of attack, wind speed increases.For the blade of having made, lift fF and resistance fD are except being the function of wind speed, be respectively the function of lift coefficient δ L and resistance coefficient δ D simultaneously, and there is the variation relation as shown in figure c with angle of attack respectively in δ L and δ D, the angle of attack that wherein δ L peak is corresponding is critical angle of attack, all along with the angle of attack increases δ L, δ D, all increases as seen at the following lift coefficient of critical angle of attack and resistance coefficient.Same fD is the function of wind speed and α, along with wind speed and the angle of attack increase fD, increases.The power curve that figure d is fan design, Vin, Vn, Vout are respectively blower fan incision, specified and cut-out wind speed.For guarantee wind speed between Vin and Vn and while continuing to increase angle of attack increase, need to keep propeller pitch angle β constant, so the reset thrust minimum value of the thrust oil hydraulic cylinder 5 now designing is wind speed Vn, and propeller pitch angle is thrust Σ fD corresponding to 0 wind wheel while spending.When wind speed is between Vn and Vout, thrust Σ fD is still the function of wind speed and propeller pitch angle β, now between wind wheel thrust Σ fD and thrust oil hydraulic cylinder 5, there is following relation: Σ fD=f(ω, β), if establish the thrust Fs=g(s of thrust oil hydraulic cylinder 5, E), s is hydraulic cylinder travel, E is elasticity coefficient, Fs=Σ fD between Vn to Vout and and the corresponding propeller pitch angle 0 of stroke 0 to Sn of thrust oil hydraulic cylinder 5 spend and set up when changing between β sn, and when wind speed changes from Vn to Vout, s is that the stroke 0 of thrust oil hydraulic cylinder 5 correspondences is to S n, when wind speed is tending towards Vout, corresponding propeller pitch angle is Σ fD=Fs(S n, the propeller pitch angle β sn in the time of E), Σ fD when wind speed meets or exceeds Vout out=Fs(Smax, E), in the wheel hub associated with the stroke 0 to Smax of thrust oil hydraulic cylinder 5, driving the corresponding propeller pitch angle of oil hydraulic cylinder 7 is 0 to 90 degree.Thrust oil hydraulic cylinder 5 can adopt complex spring structure (that is: spring is at the different spring of different running length Elastic coefficient) to meet the desired elasticity coefficient of different trip segment Σ fD.
Machinery action process of the present invention:
Wind wheel blade 8 is under the effect of wind-force, wind-force reaches after incision wind speed, wind wheel starts to be subject to a thrust and lift effect, under lift effect, start rotation, along with increasing lift, wind-force increases, wind speed round the increase of output power, after when reaching rated wind speed and being less than cut-out wind speed along with wind-force further increases, thrust starts to drive oil hydraulic cylinder to become oar according to the function relation in working principle of the present invention, keep blower fan to move near rated power, until wind-force approaches near excision wind speed, this propeller pitch angle and the suffered thrust of this wind speed lower blade change to a position that approaches 90 degree by propeller pitch angle.

Claims (8)

1. a wind-force thrust blade pitch device, is characterized in that: comprising:
Wind wheel mandrel, one end connects generator shaft, and the other end is provided with gland;
Wind wheel axle sleeve is sleeved on wind wheel mandrel, is provided with end spring between wind wheel sleeve end and gland;
Pitch variable bearings, is arranged on wind wheel mandrel outside by its bearing support, and the outer ring of pitch variable bearings is fixed on pitch variable bearings seat, and blade is fixed on the inner ring of pitch variable bearings;
Thrust oil hydraulic cylinder, is at least two groups, is distributed in wind wheel mandrel periphery after being connected in series, and is fixed on the fixed base in mandrel outside, and the piston rod end of thrust oil hydraulic cylinder is connected with wind wheel end face of shaft bush;
Become oar and drive oil hydraulic cylinder, by rotatable pin, be fixed on pitch variable bearings seat, become oar and drive between oil hydraulic cylinder and thrust oil hydraulic cylinder and be connected by nonmetal hydraulic pipe line.
2. wind-force thrust blade pitch device according to claim 1, is characterized in that: described main shaft is that generator rotor shaft stretches out generator casing, and its end is with the flange arrangement being connected with wind wheel mandrel.
3. wind-force thrust blade pitch device according to claim 1, is characterized in that: described main shaft is one end with the flange arrangement being connected with wind wheel mandrel, the structure of the other end for being connected with generator rotor shaft.
4. wind-force thrust blade pitch device according to claim 1, it is characterized in that: described wind wheel mandrel one end is the flange arrangement being connected with main shaft, the other end is with the mounting hole being connected with gland, mandrel axis body and wind wheel axle sleeve are connected part with fin, and rotor shaft cover is with the endoporus matching with mandrel fin.
5. wind-force thrust blade pitch device according to claim 1, is characterized in that: described thrust oil hydraulic cylinder is the oil hydraulic cylinder that band resets.
6. wind-force thrust blade pitch device according to claim 5, is characterized in that: described thrust oil hydraulic cylinder reset thrust minimum value is rated wind speed Vn.
7. wind-force thrust blade pitch device according to claim 1, is characterized in that: between described mandrel and pitch variable bearings seat, by muscle structure, link together.
8. wind-force thrust blade pitch device according to claim 1, is characterized in that: between described mandrel and pitch variable bearings seat, by the hub structure with muscle structure, link together.
CN201210235673.6A 2012-07-06 2012-07-06 Wind thrust pitch-variable mechanism Expired - Fee Related CN102734067B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN102734067B true CN102734067B (en) 2014-02-12

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015001902U1 (en) * 2015-03-11 2016-06-14 Liebherr-Components Biberach Gmbh Adjustment unit for pitch adjustment of a rotor blade and wind turbine with such an adjustment
CN105736250A (en) * 2016-02-26 2016-07-06 太原重工股份有限公司 Connecting structure for wind-electricity speed-up gear box and sliding ring
US11359602B2 (en) * 2017-07-06 2022-06-14 Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. Pitch varying device, pitch varying method and pitch varying control device for wind turbine blade and wind turbine
CN109209763B (en) * 2017-07-06 2019-11-29 北京金风科创风电设备有限公司 Blade pitch changing device and method for wind generating set and wind generating set
DE102018107172A1 (en) * 2018-03-26 2019-09-26 Liebherr-Components Biberach Gmbh Actuator for adjusting the pitch angle of a rotor blade of a wind turbine and wind turbine with such an actuator

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Publication number Priority date Publication date Assignee Title
FR2555125B1 (en) * 1983-11-23 1988-01-22 Joulia Pierre DEVICE FOR AUTOMATIC STEP REGULATION OF A PROPELLER
GB0031025D0 (en) * 2000-12-19 2001-01-31 Pro Design Solutions Ltd Pitch adjustment mechanism
US20070264121A1 (en) * 2006-05-10 2007-11-15 Miller James W Torsion blade pivot windmill
AU2008262699A1 (en) * 2008-06-12 2008-12-18 Stormrider Holdings Ltd Mproved wind turbine
CN102454549A (en) * 2010-10-27 2012-05-16 李运初 Synchronous power-driven multi-blade variable pitch wind driven generator
CN102182638B (en) * 2011-05-16 2013-08-21 杨永新 Wind-pressure paddle change wind driven generator
CN202628385U (en) * 2012-07-06 2012-12-26 沈阳华创风能有限公司 Wind-power thrust pitch control mechanism

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