CN105298741A - Reinforced blade for wind driven generator - Google Patents
Reinforced blade for wind driven generator Download PDFInfo
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- CN105298741A CN105298741A CN201510737641.XA CN201510737641A CN105298741A CN 105298741 A CN105298741 A CN 105298741A CN 201510737641 A CN201510737641 A CN 201510737641A CN 105298741 A CN105298741 A CN 105298741A
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- 239000004917 carbon fiber Substances 0.000 claims description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 11
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- 208000002740 Muscle Rigidity Diseases 0.000 description 23
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
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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
- Y02E10/20—Hydro energy
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Wind Motors (AREA)
Abstract
The invention provides a reinforced blade assembly (1) which comprises a blade (100), connection supports (11, 12 and 13) fixed to the blade (100) and extending and striding by a certain span along the blade in the longitudinal direction and slender blade reinforcement pieces (21, 22, 23, 24, 25 and 26). The blade reinforcement pieces (21, 22, 23, 24, 25 and 26) are configured in the manner than at least one end of each blade reinforcement pieces is connected to the connection supports (11, 12 and 13) and the blade reinforcement pieces and the blade (100) are arranged in a spaced manner. The invention further relates to a rotator for a wind power device, the wind power device and a manufacturing method of the reinforced blade assembly.
Description
Technical field
The present invention relates to and be a kind ofly preferred for wind energy facility, especially for the reinforced blade of horizontal axis wind-driven generator and the manufacture method of blade.The invention still further relates to the rotor with this blade, and there is the wind energy facility of this rotor, wind power plant, ocean current power generating equipment or tidal current generation equipment.
Background technique
Wind energy is clean renewable energy sources, fast-developing in recent years.Clean renewable energy sources will be competed with conventional energy resource (coal, oil, rock gas and big-and-middle-sized water power), reduces costs, improves its operational efficiency extremely important.Current Global Wind Power Industry is further to high-power, linear leaf future development.Large-scale horizontal axis wind-driven generator has more cost advantage when manufacture, installation and operation.Wind-power electricity generation cost per unit reduces with the increase of the single-machine capacity of wind-power electricity generation.
Blade transmission moment of torsion produce power.Although not by the restriction of theory, it is believed that, square being directly proportional of the electric energy that horizontal axis wind-driven generator produces and length of blade, and cube being directly proportional of the increase of blade material weight and length of blade, along with the increase of length of blade, increase the aerodynamic force load of blade, the weight of blade material also has greatly increased.And due to the increase of blade load, blades of large-scale wind driven generator must have higher resistance to flexure.Which increase the thickness of blade material, also with regard to the corresponding weight adding blade material.
For large-scale blade, rigidity also becomes subject matter.In order to ensure to carry in extreme wind the degree that lower blade tip is not bent to touching pylon, blade must have enough flexural rigidityes, and this is the corresponding weight adding blade again.
The size of blade material weight is run whole wind-driven generator, fatigue life, Energy transmission have important impact.
In addition, large-scale blade, by full-scale production, is difficult to transport, also more and more becomes a bottleneck of restriction Wind Power Development.For the larger sized fan blade that future is possible, the long-distance transportation of full-scale blade will be more difficult.
In addition, in the design of modern wind generator blade, blade shape also needs the balance obtaining aerodynamic efficiency and reasonable structure, obtains the most high-effect with the cost that most probable is low.
Do not regard as admission of prior art, Fig. 1 shows a kind of cross-sectional structure schematic diagram of exemplary blade.As shown in Figure 1, the blade 1 ' of wind-driven generator can comprise blade enclosure 2 and be positioned at the beam structure 3 of blade enclosure 2.In the example depicted in fig. 1, beam structure 3 such as adopts rectangular beam structures, is included in the girder 4 fixed respectively inside leaf shell and the anti-shearing web 5 providing connection at two girder 4 two ends.Form the outside that aerodynamic leaf shell is coated on girder.Main flexural load is born by girder, and leaf shell only bears a small amount of flexural load.The weight of the beam structure of blade, especially girder also accounts for the major component of blade.
Common a kind of blade material is glass fiber compound material (GFRP).Such as, blade girder and leaf shell all can be made up of glass fiber compound material.For the basic large-scale blade using glass fiber compound material to manufacture, meet intensity and the rigid requirements of blade, it is very thick that blade girder will design, and blade will be very heavy.Due to wind-driven generator run time, blade gravity produce alternate load, make blade itself and unit generation fatigue stress, the increase of leaf weight can cause blade to reach fatigue strength too early.This needs the intensity improving blade, leaf weight increases again to some extent, and the corresponding structure weight such as wheel hub, cabin, pylon of wind-driven generator that makes increases, and finally causes whole wind-driven generator cost significantly to increase, correspondingly causes wind-power electricity generation cost per unit to rise.
In order to alleviate the weight of blade, meet strength and stiffness requirement again, the general technology way adopted substitutes glass fiber compound material with carbon fiber composite (CFRP) to manufacture blade girder at present, but carbon fiber composite price is very expensive.
Therefore, improving the strength and stiffness of large-scale blade, alleviate the weight of blade simultaneously, reduce the cost of blade, is that current Wind Power Development needs the urgent problem solved.
Prior art proposes to be strengthened the rotor of wind-driven generator.
Chinese patent application publication number CN101230834A relates to a kind of stretching type wind mill wind wheel, blade divides two-stage, centre arranges central axis seat, equilateral triangle is become with the composite material tape stretch-draw in streamline section between three central axis seats, when making each blade be in different gesture position in gravity accleration, offset the unbalanced external force of part; Wind wheel is also strengthened with similar stretching force in three central axis seats and wheel hub front end and back end.
U.S. Patent Application Publication No. US2010/0086407A1 relates to a kind of wind turbine rotor, comprise one or more rotor blade and the rotor stiffening elements in order to strengthen described rotor, wherein said rotor blade is arranged such that they can rotate relative to corresponding rotor stiffening elements around its longitudinal axis.Each rotor blade all can comprise at least two rotor blade section, and wherein external rotor blade-section is arranged to and can rotates relative to internal rotor blade-section.This wind turbine rotor also comprises connection set, for being connected to each other by rotor stiffening elements.This wind turbine rotor also comprises blade stiffening elements and spacer element, for strengthening rotor blade, to prevent curved deflector.
The wind wheel of above-mentioned prior art or complex rotor structure, need between adjacent blade, to install stretch-draw line with balance blade gravity.Operationally, blade is waving direction (perpendicular to rotor blade plane of rotation) and shimmy direction (in rotor blade plane of rotation) has vibration to wind energy conversion system.Due to the existence of stretch-draw line, the dynamic response of blade is more complicated.The vibration of each blade can not Complete Synchronization, and therefore influence each other between blade, cause blade also likely to increase at the amplitude in shimmy direction, the maximal bending moment in shimmy direction also likely increases.
In addition, central axis seat (' 834 open source literature due between two blade sections) and connection set and spacer element (' 407 open source literature), connection between blade sections is not solid and reliable, affect aerodynamic efficiency and the reasonable structure of blade, and these linkage structures are complicated, and blade may be caused at the strength loss of connection part.Especially, in the open source literature of ' 407, longitudinally put position because the spacer element for blade stiffening elements is only arranged between adjacent two blade sections, arranging of blade stiffening elements may cause producing at blade sections connection part place excessive moment of flexure, causes the forfeiture of flexural rigidity.
Therefore, more high strength and rigidity can be had and the reinforced blade that simply improves of the structure preferably effectively alleviating leaf weight desirable to provide a kind of.
Summary of the invention
Therefore, task of the present invention is to provide a kind of reinforced blade, and it has lighter weight, meets the strength and stiffness requirement of blade simultaneously.
According to one embodiment of present invention, a kind of reinforced blade assembly is provided, comprise: blade, be fixed to blade and extend longitudinally across connection bracket and at least one elongated blade stiffeners of one section of span along blade, wherein, described blade stiffeners is configured at least one end and is connected to described connection bracket to open with described spacing with blades.
By the combination of blade stiffeners and connection bracket, can with relatively light weight, the blade of satisfactory, even better flexural strength and rigidity, especially higher flexural rigidity is provided.Especially, the connection bracket extending across a segment distance in the vertical can ensure the rigidity at blade stiffeners link position effectively.
Preferably, described blade stiffeners is tensile reinforcement member and is configured to be applied in stretch-draw prestressing force.
More preferably, described blade stiffeners is high strength, high modulus fibre rope, such as carbon fiber rope etc.This provide the high strength of wonderful weight loss effect and blade.
According to a preferred embodiment, at least one in described blade stiffeners is configured to be connected to described connection bracket in one end of described blade stiffeners, is connected directly to described blade at the other end of described blade stiffeners.
According to a preferred embodiment, at least one in described blade stiffeners is configured to be connected to point other connection bracket at the two ends of described blade stiffeners and is roughly parallel to the extension of described blade.
According to a preferred embodiment, reinforced blade assembly comprises multiple described blade stiffeners.According to further preferred embodiment, at least two in described multiple blade stiffeners are configured to roughly longitudinally be connected to the both sides of same connection bracket along blade longitudinal extension alignedly.As a supplement or substitute, at least two in described multiple blade stiffeners are configured to be connected to the same side of same connection bracket along blade longitudinal extension concurrently.
According to a preferred embodiment, described connection bracket comprise the first leg, with described first leg in the longitudinal direction of the blade isolated second leg and described first leg and the second leg are fixed to one another be connected or integrally formed connecting element.This advantageously strengthens the rigidity of blade, especially in the rigidity at connection bracket place.
According to a preferred embodiment of the present invention, described blade comprises multiple blade sections, and described connection bracket comprises the first leg be positioned in one of them blade sections, is positioned at the second leg in adjacent blade sections and described first leg and the second leg is fixed to one another the connecting element of connection.Thus, connection bracket provide not only the rigidity of reinforcement, can also strengthen being fixedly connected with between adjacent blades section.
According to a specific embodiment, described blade comprises the blade enclosure of beam structure and coated described beam structure.
According to another program of the present invention, provide a kind of rotor for wind energy facility, comprise hub and the multiple blades being connected to described hub, at least one in wherein said multiple blade is according to reinforced blade assembly of the present invention.
According to another program of the present invention, provide a kind of wind energy facility, it is wind power plant and comprises according to rotor of the present invention.
According to another program of the present invention, a kind of manufacture method of reinforced blade assembly is provided, comprises the steps:
There is provided multiple blade sections, wherein each blade sections is fixedly connected with or is formed with connection leg;
Blade sections is mutually permanently connected;
Be mutually permanently connected by means of the connection leg of connecting element by adjacent blades section, to form the connection bracket extending longitudinally across one section of span along blade;
Be arranged on by elongated blade stiffeners in described blade assembly, at least one end of wherein said blade stiffeners is fixedly connected with described connection leg.
A part for other features and advantages of the present invention will be that those skilled in the art are obvious after reading the application, and another part describes by reference to the accompanying drawings by embodiment hereafter.
Accompanying drawing explanation
Below, describe embodiments of the invention in detail by reference to the accompanying drawings, wherein:
Fig. 1 is a kind of cross-sectional structure schematic diagram of exemplary blade;
Fig. 2 is the stereogram of the reinforced blade according to the embodiment of the present invention;
Fig. 3 A is the front view of the reinforced blade according to the embodiment of the present invention;
Fig. 3 B is the side view of the reinforced blade according to the embodiment of the present invention;
Fig. 4 is the partial enlarged drawing of the reinforced blade according to the embodiment of the present invention, shows the connection of blade stiffeners and connection bracket;
Fig. 5 is the partial enlarged drawing of the reinforced blade according to the embodiment of the present invention, shows the details of connection bracket;
Fig. 6 A and Fig. 6 B respectively illustrates the schematic cross-section of the blade beam structure of reference examples and the reinforced blade beam structure according to the embodiment of the present invention.
Embodiment
In order to there be understanding clearly to technical characteristics of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.Although provide accompanying drawing to be to present some embodiments of the present invention, accompanying drawing need not be drawn by the size of specific embodiments, and some feature can be exaggerated, remove or cutting better to illustrate and to explain disclosure of the present invention.The phrase " in the accompanying drawings " occurred in the description or similar term need not with reference to institute's drawings attached or examples.
Be used to some directional terminology describing accompanying drawing in the description, such as " on ", D score, "left", "right", " upwards ", " downwards " and other directional terminology, have its normal implication by being understood to and those directions involved when often seeing respective drawings of making a comment or criticism, this should not be construed as the concrete restriction of the technological scheme to claims.
Term " about " in the present invention or " approximately " will be understood by those of ordinary skill in the art and change according to the context using this term within the specific limits.
Description, describes the embodiment according to the reinforced blade assembly for wind power plant rotor of the present invention.According in embodiments of the invention, this reinforced blade assembly is used for wind power plant, such as horizontal axis wind-driven generator, preferably large-scale horizontal axis wind-driven generator.But can expect, reinforced blade assembly according to the present invention also may be used for the suitable applications occasion of any use blade, the wind energy facility of such as other type, ocean current and tidal current generation equipment.
Although not shown, exemplary wind power plant such as comprises blower fan and generator.Blower fan can comprise the rotor with hub and multiple blade, and preferably described multiple blade is arranged at interval equably around the circumference of hub.Preferably, longitudinally can rotate around blade according to blade of the present invention, such as blade is variablepiston.As is known and be not shown, blower fan can also comprise the pylon in cabin for rotatably support rotor and the described cabin of supporting.Preferably, the hub of cabin rotatably support rotor or rotating shaft (not shown), thus the rotation of rotor can such as drive generator to carry out wind-power electricity generation by means of the driving mechanism be accommodated in cabin.In the present invention, the structure of cabin and pylon is not crucial, does not therefore repeat.In addition, also correspondingly can be applied to the wind power plant of other structures according to blade assembly of the present invention and rotor, such as, not there are cabin and/or pylon those.
Blade 100 and blade stiffening device can be comprised according to the reinforced blade assembly 1 of the embodiment of the present invention.Preferably, this blade stiffening device can comprise elongated blade stiffeners and linkage structure, such as connection bracket, as detailed below.
Blade 100 according to the embodiment of the present invention such as can construct as Fig. 1, comprises blade enclosure 2 and by the coated beam structure 3 of blade enclosure 2.As previously mentioned, in an illustrated embodiment, beam structure 3 can comprise a pair girder 4 and anti-shearing web 5.As previously mentioned, blade, such as blade enclosure 2 and beam structure 3 in the embodiment shown can be made up of glass fiber compound material.It will be apparent to one skilled in the art that and can use different blade structures, material and shape according to the blade of the embodiment of the present invention.Such as, can use there is different beam structures, vane airfoil profile profile.Such as, blade enclosure and beam structure are made up of different materials, or the material of blade enclosure is different with the material of beam structure.
Fig. 2-Fig. 5 shows the reinforced blade assembly 1 of the embodiment of the present invention.Blade 100 can comprise multiple blade sections, in an illustrated embodiment, comprises three blade sections, that is, the first blade sections blade root section 101, second blade sections intermediate blade section 102, Three-blade section blade tip section 103 in other words in other words in other words.Those skilled in the art can understand, blade 100 can comprise the blade sections greater or less than three sections, and this falls into scope of invention.Those skilled in the art can also understand, can be single-piece according to blade of the present invention, namely do not have multiple blade sections, this also falls into scope of invention.
The mating face (not shown) for engaging with adjacent blades can be had according to the sectional-type blade of the embodiment of the present invention.Can by any suitable mode, blade sections engages to form integral blade at the mating face place of blade sections by such as preferred weld, riveted joint or material fusion.
Continue with reference to figure 2-Fig. 5, illustrate the illustrative examples according to blade stiffening device of the present invention below.
As previously mentioned, this blade stiffening device can comprise to be arranged on outside blade enclosure 2, the especially elongated blade stiffeners 21,22,23,24,25,26 of blade windward side (in Fig. 3 B, the direction of arrow of W is the direction of wind) and linkage structure, here in connection bracket 11,12,13 form.Described linkage structure, to be preferably directly fixed to or integrally formed to blade enclosure and/or girder as connection bracket.
As shown in Figure 2, in the illustrated embodiment, blade assembly 1, particularly blade stiffening device can comprise three and be fixed to blade 100 and the connection bracket 11,12,13 extending longitudinally across one section of span along blade.In an illustrated embodiment, multiple connection bracket is preferably along the roughly longitudinal arrangement of blade.But people can expect, blade assembly can comprise more or less connection bracket, and the number of connection bracket preferably can be equal with the number of blade sections, but also can be unequal.Described connection bracket can have various shape and/or structure, and hereafter a specific embodiment of connection bracket will be described in detail in detail.
Fig. 3 A and Fig. 3 B respectively illustrates front view and the side view of the reinforced blade assembly of the present invention.Blade assembly 1, particularly blade stiffening device can comprise multiple elongated blade stiffeners, be six blade stiffeners 21,22,23,24,25,26 in an illustrated embodiment.These blade stiffeners 21-26 is preferably connected to connection bracket 11,12,13 at least one end.
Preferably, blade stiffeners 21,23,25 and 22,24,26 directly or be indirectly fixedly attached to blade 100 blade enclosure and/or girder in other words by connection bracket, and by means of connection bracket 11,12,13 and blade enclosure spaced apart.
In an illustrated embodiment, blade stiffeners 21,22 along blade parallel longitudinal be connected to connection bracket 11 and connection bracket 12 respectively at two ends, and be preferably roughly parallel to blade surface extend.Blade stiffeners 23,24 along blade parallel longitudinal be connected to connection bracket 12 (side contrary with blade stiffeners 21,22 link position) and connection bracket 13 respectively at two ends, and be preferably roughly parallel to blade surface extend.Blade stiffeners 25,26, along blade longitudinally at one end connection bracket 13 (side contrary with blade stiffeners 23,24 link position) concurrently, is connected directly to blade 100 blade sections 103 in other words at the other end at tie point 14,15 place.Preferably, the correct position of tie point 14,15 is calculated according to the loadometer of blade.In a nonrestrictive preferred embodiment, this other end can be connected with blade at blade sections 103 loaded center of gravity place.Described tie point is equivalent to provide fulcrum to blade sections 103.Tie point 14,15 place that can reduce blade sections 103 like this, to the moment of flexure of connection set 13 place blade, also just can reduce the thickness of blade this section of girder and shell.In an illustrated embodiment, blade stiffeners 21,23,25 is roughly longitudinally alignedly along blade longitudinal extension.In an illustrated embodiment, blade stiffeners 22,24,26 is roughly longitudinally alignedly along blade longitudinal extension.
In conjunction with reference to figure 3A-B and Fig. 4, show blade connection bracket being housed and being connected with blade stiffeners.For keeping blade to have the best geometry angle of attack, blade longitudinally different radii place will have different twist angle of blade.According to blade stiffeners and the connection bracket of the embodiment of the present invention, according to the corresponding layout of the blade with different leaves torsional angle.Preferably, the multiple blade stiffeners longitudinally roughly alignd can along feather spin axis or aerodynamic centre's Axis Extension or parallel with it.In an illustrated embodiment, first group of blade stiffeners longitudinally roughly alignd 21,23 and 25 and second group of blade stiffeners longitudinally roughly alignd 22,24 and 26 can with feather spin axis or aerodynamic centre's axis being parallel be positioned at this axis both sides, be preferably symmetrical about this axis.Although in an illustrated embodiment, show every three blade stiffeners longitudinally roughly to align, and every two blade stiffeners are parallel is arranged on axis both sides, but other configuration can be expected, the blade stiffeners that the parallel blade stiffeners of the blade stiffeners that the longitudinal direction of such as more or less number is roughly alignd or more more number or only have longitudinally roughly aligns or only have parallel blade stiffeners or in one embodiment, only can have one such as along the blade stiffeners of Axis Extension and the connection bracket being such as positioned at blade root or blade tip.
By means of blade stiffening device according to the present invention, as blade stiffeners 21,23 and 22,24 and connection bracket expand the cross section of blade girder, improve the flexural rigidity (EI) of blade.By means of extending longitudinally, especially contributing to improving the flexural rigidity (EI) that blade waves direction with the blade stiffeners of feather spin axis or aerodynamic centre's axis being parallel.More preferably, be arranged in the blade stiffeners of axis both sides, contribute to improving the flexural rigidity (EI) that blade waves direction and shimmy direction simultaneously.
Preferably, blade stiffeners can have preferred structure, material and shape.
In a preferred embodiment, blade stiffeners can have different shape of cross sections, such as preferred circular, but also can be rectangle, square, oval etc.More preferably, blade stiffeners, along on blade longitudinally each blade sections, can have different cross-sectional dimension.The cross-sectional dimension of blade stiffeners successively decreases from blade root section to blade tip section, and blade stiffeners also can correspondingly adjust to the distance of blade enclosure.
Preferred but in unshowned embodiment at one, can one of them, the outer installment externally-packed structure of preferably whole blade stiffeners.Preferably, the outsourcing cross section of blade stiffeners also can have difformity, can be circular, oval etc.More preferably, the outsourcing cross section of blade stiffeners is selected to meet aerodynamic outsourcing shape, to reduce windage and noise.Particularly preferably, select outsourcing air foil shape, make it produce lift, contribute to the rotation of rotor blade.
In a preferred embodiment, in blade stiffeners at least one, be preferably all the tensile reinforcement member of tensile reinforcement member, preferably high strength, preferably flexible tensile reinforcement member, preferably rope.Preferably, in blade stiffeners at least one, be preferably all the rope that fiber composite is made, be more preferably carbon fiber rope.But can expect, blade stiffeners can comprise or the rope of other type, such as make for material same with blade, as glass fibre rope.
In a preferred embodiment, stretch-draw prestressing force can be applied to blade stiffeners 21-26, make blade girder first tension stress first.At blade run duration, prestretching stress can the pressure stress that causes of partial offset load, thus improves the bearing capacity of blade.
With reference to figure 5, the embodiment according to connection bracket of the present invention is described.Connection bracket 11,12,13 can comprise the first leg 31, second leg 32 longitudinally-spaced with the first leg 31 and described first leg 31 and the second leg 32 are fixed to one another the connecting rod 33 or any suitable connecting element that are connected.Continue with reference to figure 5, connection bracket can be frame-like, and preferably described first leg 31 and the second leg 32 can be all trabeation, such as, comprise post member 311-312,321-322 and the cross-member 313,323 of preferred parallel respectively.In the preferred embodiment shown, the integral frame columnar structure of connection bracket and the shape of connecting element are conducive to reducing the aerodynamic impact on blade, such as, minimize windage.But it will be apparent to one skilled in the art that connection bracket can in other structure or shape, this falls within the scope of the present invention.Such as, the number of leg, post member, cross-member and/or connecting element or shape can be different.
Continue with reference to figure 5, the manufacture method of the reinforced blade of segmented is according to an embodiment of the invention described.In one exemplary embodiment of the present invention, blade sections 101,102 and 103 sectional making, and can assemble at the scene.When manufacturing blade sections, each blade sections is fixedly connected with or is integrally formed leg.Such as, the first leg 31 is fixedly connected with or is integrally formed to blade sections 101 or its surface, and the second leg 32 is fixedly connected with or is integrally formed to adjacent blade sections 102 or its surface.During Assembling blade, blade sections 101, between 102 and 103, especially their girder, web and leaf shell can use various suitable connection means, such as, rivet, weld and be connected to each other.Then, connecting element can be used, the first and second legs are fixedly connected with, to form the connection bracket extending longitudinally across one section of span along blade as connecting rod 33.In an illustrated embodiment, be fixedly connected with un-rotatably between adjacent blades section, therefore ensure that the integral rigidity of blade at work.In such configuration, connection bracket not only because its in the vertical (and/or in the horizontal) stride across one section of span and the flexural rigidity of improvement be provided as beam, also play the effect of the connection improving adjacent blades section.
Preferably, blade stiffeners 21-26 can be connected to connection bracket (leg) and/or blade (blade sections) when manufacturing blade sections.In alternate embodiments, blade stiffeners 21-26 can install at the scene, such as install after formation connection bracket.
But it may occur to persons skilled in the art that, connection bracket can integrally blade girder, web and shell be integrally formed in other words with blade, or connection bracket integrally can be fixedly attached to blade blade girder, web and shell in other words, and this is particularly suitable for integral blade.Now, connection bracket still can because of its in the vertical (and/or in the horizontal) stride across one section of span and the flexural rigidity of improvement be provided as beam.
Preferably, connection bracket can by with blade in other words blade girder, material that web is identical with shell formed, such as formed by glass fiber compound material, merge more preferably by material and be integrally formed.But it will be apparent to one skilled in the art that connection bracket also can adopt different materials to be formed.
In order to specifically show beneficial effect of the present invention, hereinafter with reference to Fig. 6 A and Fig. 6 B with comparative examples (Fig. 6 A) with according to embodiments of the invention (Fig. 6 B).
Fig. 6 A central sill 1 shows the blade beam structure schematic cross-section of comparative example.The upper and lower beam slab thickness of girder is t, and width is b, and be highly the rectangular beam structures of d, material is glass fiber compound material, and Young's modulus is E.Fixed by shear web between the upper and lower beam of girder, main flexural load is born by girder, and the weight of blade girder accounts for the major component of leaf weight.
Fig. 6 B central sill 2 shows the beam structure schematic cross-section of the reinforced blade according to the embodiment of the present invention.On girder, central sill plate thickness is T, and width is b, and fixed by shear web between upper, central sill, materials'use glass fiber compound material, Young's modulus is E.Blade stiffeners plays beam action under girder, and Young's modulus is E
c, section area is S, and equivalent elastic modulus area (SE identical with upper beam
c=TbE).Beam structure depth of section is d+D.
Due to the prolate feature of vane airfoil profile, make the rigidity of the rigidity of waving direction much smaller than shimmy direction of blade.And wave the stressed of direction and be obviously greater than the stressed of shimmy direction.The load in shimmy direction is mainly by blade gravity effect, and load is in cyclically-varying.Calculate beam below and wave the flexural rigidity in direction, flexural stress, the maximum flexibility of free end and the weight of beam at blade.
For ease of comparing, in the beam 2 in setting Fig. 6 B, D=d, T=t/2.Calculate by rectangular beam structures, assuming that depth of beam d is more much larger than the thickness of beam slab (t, T) and web, the flexural rigidity (EI) (about x-axis or x ' axle, when blade stiffeners tension stress, upper beam compression chord) that blade waves direction approximates respectively:
EI (beam 2)=2EI (beam 1)
Maximum flexural stress under blade waves direction load approximates respectively:
σ (beam 2)=σ (beam 1) (the glass fiber compound material position of upper beam slab)
For ease of comparing, assuming that the full beam of the flexural rigidity of blade beam structure (EI) is identical, by uniformly distributed load.Calculate by overhang, the maximum flexibility waving direction blade tip (free end) at blade approximates respectively:
At " TheSandia100-meterAll-glassBaselineWindTurbineBlade:SNL1 00-00 (the full glass fiber compound material wind turbine blade of Sandia100 rice: SNL100-00 that Sandia National Laboratory of the U.S. (SandiaNationalLaboratories) delivered in June, 2011, http://windpower.sandia.gov/other/113779.pdf) " Young's modulus of glass fiber compound material E-LT-5500/EP-3 recorded in research report is 41.8GPa, tensile strength is 972MPa, compressive strength is 702MPa, density is 1950kg/m
3.
U.Meier2012 to deliver February " CarbonFiberReinforcedPolymerCables:Why? WhyNot? WhatIf? " (carbon fiber composite rope: why not? http://link.springer.com/article/10.1007/s13369-012-0185-6) in paper, the Young's modulus of T700s carbon fiber rope is 165GPa, tensile strength is 3300MPa, and density is 1560kg/m
3.
Upper, middle beam slab in the embodiment shown can adopt above-mentioned glass fiber compound material E-LT-5500/EP-3, and blade stiffeners adopts above-mentioned T700s carbon fiber rope.Thus, the Young's modulus of T700s carbon fiber rope is 4 times of (E of E-LT-5500/EP-3
c=4E), the density of T700s carbon fiber rope is the 80% (ρ of E-LT-5500/EP-3
c=0.8 ρ).
In beam 2
like this, area
The unit weight of beam 1 and beam 2 approximates respectively:
M (beam 1)=2tb ρ
By above analysis, the comparison that beam 2 blade corresponding to beam 1 waves direction flexural rigidity, maximum stress in bend, maximum distortion (blade tip) and beam weight can be obtained, as shown in table 1.
Table 1
| Flexural rigidity | Maximum stress in bend | Maximum distortion (blade tip) | Girder weight | |
| Beam 1 (comparative example) | 1 | 1 | 1 | 1 |
| Beam 2 (the present invention) | 2 | 1 | 0.5 | 0.55 |
As can be seen from Table 1, blade girder maximum stress in bend and the comparative example girder of the embodiment of the present invention keep the same, but maximum distortion (blade tip) only has the latter's 50%, and blade girder deadweight is the latter's 55%.And the carbon fiber rope weight of the embodiment of the present invention is 5% of comparative example blade girder weight.
Be to be understood that, although this specification describes according to each embodiment, but not each embodiment only comprises an independently technological scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, technological scheme in each embodiment also through appropriately combined, can form other mode of executions that it will be appreciated by those skilled in the art that.The feature of the innovation disclosed in specification is not requisite, the feature of each innovation can with other existing configuration and obtain new technological scheme, this all falls within the scope of the present invention.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.
Reference numerals list
1-blade assembly 26-blade stiffeners
2-blade enclosure 31-first leg
3-beam structure 32-second leg
4-girder 33-connecting rod
5-anti-shearing web 100-blade
11-connection bracket 101-first blade sections, blade root section
12-connection bracket 102-second blade sections, intermediate blade section
13-connection bracket 103-Three-blade section, blade tip section
14-tie point 311-post member
15-tie point 312-post member
21-blade stiffeners 313-cross-member
22-blade stiffeners 321-post member
23-blade stiffeners 322-post member
24-blade stiffeners 323-cross-member
25-blade stiffeners 1 '-blade
Claims (13)
1. a reinforced blade assembly (1), comprise: blade (100), be fixed to blade (100) and extend longitudinally across connection bracket (11,12,13) and at least one elongated blade stiffeners (21,22,23,24,25,26) of one section of span along blade, wherein, described blade stiffeners (21,22,23,24,25,26) is configured at least one end and is connected to described connection bracket (11,12,13) with spaced apart with described blade (100).
2. reinforced blade assembly (1) according to claim 1, wherein, described blade stiffeners (21,22,23,24,25,26) is for tensile reinforcement member and be configured to be applied in stretch-draw prestressing force.
3. reinforced blade assembly (1) according to claim 1, wherein, described blade stiffeners (21,22,23,24,25,26) is high strength, high modulus material, such as carbon fiber rope.
4. reinforced blade assembly (1) according to any one of claim 1 to 3, wherein, at least one in described blade stiffeners (21,22,23,24,25,26) is configured to be connected to described connection bracket in one end of described blade stiffeners, is connected directly to described blade (100) at the other end of described blade stiffeners.
5. reinforced blade assembly (1) according to any one of claim 1 to 3, wherein, at least one in described blade stiffeners (21,22,23,24,25,26) is configured to be connected to point other connection bracket at the two ends of described blade stiffeners and is roughly parallel to described blade (100) extension.
6. reinforced blade assembly (1) according to any one of claim 1 to 3, comprises multiple described blade stiffeners (21,22,23,24,25,26), wherein:
At least two in described multiple blade stiffeners (21,22,23,24,25,26) are configured to roughly longitudinally be connected to the both sides of same connection bracket along blade longitudinal extension alignedly; And/or
At least two in described multiple blade stiffeners (21,22,23,24,25,26) are configured to be connected to the same side of same connection bracket along blade longitudinal extension concurrently.
7. reinforced blade assembly (1) according to any one of claim 1 to 3, wherein, described connection bracket (11,12,13) comprises the first leg (31), is connected or integrally formed connecting element with described first leg isolated second leg (32) and described first leg (31) and the second leg (32) being fixed to one another in the longitudinal direction of blade (100).
8. reinforced blade assembly (1) according to any one of claim 1 to 3, wherein, described blade (100) comprises multiple blade sections (101,102,103), and described connection bracket (11,12,13) comprises the first leg (31) be positioned in one of them blade sections, is positioned at the second leg (32) in adjacent blade sections and described first leg (31) and the second leg (32) is fixed to one another the connecting element of connection.
9. reinforced blade assembly (1) according to any one of claim 1 to 3, wherein, described blade (100) comprises the blade enclosure (2) of beam structure (3) and coated described beam structure (3).
10. a rotor, comprise hub and the multiple blades being connected to described hub, at least one in wherein said multiple blade is reinforced blade assembly according to any one of claim 1 to 9.
11. 1 kinds of wind energy facilitys, comprise rotor according to claim 10.
12. 1 kinds of power generating equipments, comprise rotor according to claim 10, and described power generating equipment is wind power plant, ocean current power generating equipment or tidal current generation equipment.
The manufacture method of 13. 1 kinds of reinforced blade assemblies, comprises the steps:
There is provided multiple blade sections, wherein each blade sections is fixedly connected with or is formed with connection leg;
Blade sections is mutually permanently connected;
Be mutually permanently connected by means of the connection leg of connecting element by adjacent blades section, to form the connection bracket extending longitudinally across one section of span along blade;
Be arranged on by elongated blade stiffeners in described blade assembly, at least one end of wherein said blade stiffeners is fixedly connected with described connection leg.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510737641.XA CN105298741B (en) | 2015-11-03 | 2015-11-03 | The reinforced blade of wind-driven generator |
| PCT/CN2016/094594 WO2017076096A1 (en) | 2015-11-03 | 2016-08-11 | Reinforced blade for wind-driven generator |
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|---|---|---|---|
| CN201510737641.XA CN105298741B (en) | 2015-11-03 | 2015-11-03 | The reinforced blade of wind-driven generator |
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| CN105298741B CN105298741B (en) | 2018-11-06 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017076096A1 (en) * | 2015-11-03 | 2017-05-11 | 周方 | Reinforced blade for wind-driven generator |
| CN107366604A (en) * | 2016-05-13 | 2017-11-21 | 周方 | The multisection type rotor blade of wind-driven generator |
| CN113477976A (en) * | 2021-07-29 | 2021-10-08 | 中材科技（阜宁）风电叶片有限公司 | Blade drilling method and support |
| CN115752283A (en) * | 2022-12-14 | 2023-03-07 | 盛东如东海上风力发电有限责任公司 | Blade deformation measuring method and device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109083798B (en) * | 2017-06-13 | 2024-02-06 | 国网江苏省电力公司常州供电公司 | Fluid power generation device |
| CN116498486A (en) * | 2023-02-17 | 2023-07-28 | 清新能源科技张家口有限公司 | Sectional type cable support type wind driven generator blade |
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| WO2017076096A1 (en) * | 2015-11-03 | 2017-05-11 | 周方 | Reinforced blade for wind-driven generator |
| CN107366604A (en) * | 2016-05-13 | 2017-11-21 | 周方 | The multisection type rotor blade of wind-driven generator |
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| CN113477976A (en) * | 2021-07-29 | 2021-10-08 | 中材科技（阜宁）风电叶片有限公司 | Blade drilling method and support |
| CN115752283A (en) * | 2022-12-14 | 2023-03-07 | 盛东如东海上风力发电有限责任公司 | Blade deformation measuring method and device |
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|---|---|
| WO2017076096A1 (en) | 2017-05-11 |
| CN105298741B (en) | 2018-11-06 |
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