WO2013004156A1 - Blade with constant cross section, forming method thereof, and horizontal axis wind turbine impeller comprised of the same - Google Patents

Blade with constant cross section, forming method thereof, and horizontal axis wind turbine impeller comprised of the same

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Publication number
WO2013004156A1
WO2013004156A1 PCT/CN2012/077981 CN2012077981W WO2013004156A1 WO 2013004156 A1 WO2013004156 A1 WO 2013004156A1 CN 2012077981 W CN2012077981 W CN 2012077981W WO 2013004156 A1 WO2013004156 A1 WO 2013004156A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
blade
constant cross
structure
section
segments
Prior art date
Application number
PCT/CN2012/077981
Other languages
French (fr)
Chinese (zh)
Inventor
张向增
Original Assignee
Zhang Xiangzeng
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/40Shaping or impregnating by compression not applied
    • B29C70/50Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
    • B29C70/52Pultrusion, i.e. forming and compressing by continuously pulling through a die
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS; PRODUCING MECHANICAL POWER; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D1/00Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06Rotors
    • F03D1/0608Rotors characterised by their form
    • F03D1/0633Rotors characterised by their form of the blades
    • F03D1/0641Rotors characterised by their form of the blades of the section profile of the blades
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS; PRODUCING MECHANICAL POWER; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D1/00Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06Rotors
    • F03D1/065Rotors characterised by their construction, i.e. structural design details
    • F03D1/0658Fixing wind-engaging parts to rotor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS; PRODUCING MECHANICAL POWER; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D1/00Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06Rotors
    • F03D1/065Rotors characterised by their construction, i.e. structural design details
    • F03D1/0666Rotors characterised by their construction, i.e. structural design details of the whole rotor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS; PRODUCING MECHANICAL POWER; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D1/00Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06Rotors
    • F03D1/065Rotors characterised by their construction, i.e. structural design details
    • F03D1/0675Rotors characterised by their construction, i.e. structural design details of the blades
    • F03D1/0683Rotors characterised by their construction, i.e. structural design details of the blades of the section profile of the blades
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00Subject matter not provided for in other groups of this subclass
    • B29D99/0025Producing blades or the like, e.g. blades for turbines, propellers, or wings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/08Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
    • B29L2031/082Blades, e.g. for helicopters
    • B29L2031/085Wind turbine blades
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
    • F05B2230/00Manufacture
    • F05B2230/50Building or constructing in particular ways
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
    • F05B2250/00Geometry
    • F05B2250/30Arrangement of components
    • F05B2250/31Arrangement of components according to the direction of their main axis or their axis of rotation
    • F05B2250/314Arrangement of components according to the direction of their main axis or their axis of rotation the axes being inclined in relation to each other
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
    • F05B2280/00Materials; Properties thereof
    • F05B2280/60Properties or characteristics given to material by treatment or manufacturing
    • F05B2280/6003Composites; e.g. fibre-reinforced
    • 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
    • Y02E10/721Blades or rotors
    • 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
    • Y02P70/52Manufacturing of products or systems for producing renewable energy
    • Y02P70/523Wind turbines

Abstract

Disclosed in the present invention are a fiber reinforced resin matrix composite blade with a constant cross section, a forming method thereof and a wind turbine impeller comprised of the blade, wherein the blade is mainly comprised of resin, fiber and core material, and can be a combined structure of multiple blade fragments (1). Each of the blade fragments has a constant cross section with a special chord length, and the chord lengths of various blade fragments are different with each other. The blade is fixed on a hub (8) of the impeller by means of a tensioned-cable structure, so as to form the impeller with fixed or variable pitch. The blade formed by pultrusion has very high quality stability and a high-precision exterior geometrical profile. The impeller with a large diameter, which is needed in a horizontal axis wind turbine, can be realized with the blade above, so that the impeller can have high aerodynamic profile precision, small stress deformation deflection and large sweeping area of a long blade, so as to realize an ideal wind catching effect.

Description

Constant cross section of the blade, forming method, and a horizontal axis wind Ye Lun generator configured Technical Field

The present invention relates to a continuous pultrusion process having a constant cross section forming a fiber reinforced resin composite material of the blade, which relies on a thin blade structure or a truss structure of the fixed cable, it can be easily realized large horizontal axis wind turbine requires a large diameter Ye Lun, Ye Lun is such a structure greatly reduces the cost of the wind wheel.

The present invention belongs to the field of manufacturing composite blades, or a horizontal axis wind turbine manufacturing art. Background technique

Modern horizontal axis wind turbine Ye Lun, both single blade, double blade, or three-blade Ye Lun constituted, Each blade is an independent pitch control is cantilevered bearing structure, therefore, each blade from the tip to the blade root withstand increased bending moments abruptly, so geometrical thickness from the tip to the root of the blade profile is increased, and the thickness of the blade is also increasing rapidly. Because the strength and modulus of the material is limited by the blade difficult to achieve a long, even with a high specific strength and specific modulus carbon fiber material, to achieve the large diameter of Ye Lun blades are very heavy, consumes a lot of material.

In order to improve the utilization of wind energy turbine, the turbine blades of modern wind power are with variable cross-sectional configuration, the blade root, the chord length of the blade from the tip to the continuously increasing, also increasing the thickness of the blade, in line with the structure and maximize the aerodynamic efficiency maximize the efficiency of the design principles of unity.

This is a performance-oriented design to maximize, to this end, to pay the cost of the price will be high. Although it was suggested that an increase in extension between the hub and the Ye Lun blades increase the diameter to disguise. It does not solve the problem set forth above nature.

Many designers to reduce the cost of Ye Lun, with fewer blades (e.g. 2) and the high tip speed ratio. Doing so the effect is not very good, because, tip speed ratio is too high will inevitably bring about a significant increase in Ye Lun axial thrust, increasing their blade bending moment, bending moment and wind towers will also increase, to whom pay extra reinforcement costs.

Better to transform an idea is to use a lower cost of equivalent power, may be interpreted as follows: if a section of the blade manufacturing process of an inexpensive, lightweight construction and with this manufacturing Ye Lun blade, although the blade aerodynamic efficiency may be a little lower, but can easily do the large diameter Ye Lun, the contribution swept area of ​​increased power is much to make up for the power loss caused by reduced efficiency. Further, the current blade is molded piece after piece molded in a static batch particular mold. This process is typically: system main beam preform, the preform pneumatic pressure surface, the preform pneumatic suction surface, and then together with three structural bonding. Finally, on the bonding part and then hand lay reinforcement. This leaves the molding process, most defects occur in that: gluing is not reliable + + resinated defective laid layer of fiber orientation bias ply corrugated defects + + insufficient curing defects. The presence of these defects, has led to operation of the blade fails, reliability is not high. Composite blade while forming a continuous pultrusion process must be able to overcome all these drawbacks. SUMMARY

Object of the present invention is to realize an inexpensive, reliable, large horizontal axis wind turbine manufacturing techniques diameter of Ye Lun.

The so-called large-diameter Ye Lun, Ye Lun can be understood as the diameter of 80m or more.

Idea of ​​the present invention is the use of a continuous pultrusion process for producing fiber resin reinforced composite material having a constant cross-section of the blade, such as blade structure thin enough to separate large bending moment and torque resistance, so that the impeller truss structure must be provided with a fixed blade or cable structure in order to run and maintain the force of stability.

Cheap and inexpensive blade cable structure, such that a significant reduction in the cost of Ye Lun.

However, each blade must be able to independently control the pitch, which is the ability of modern wind turbine must have a horizontal axis. To achieve this, the bearings must be connected by a coupling structure between the blade and the.

First, to illustrate the blade structure and its molding method.

Continuous pultrusion molding composite material profile is a mature technology. A fiber-reinforced resin composite material of the blade, having a contour characteristic of the typical aerodynamic structure, a resin and fibers, can be implemented by a pultrusion process, the result is of course made of blade segments having a constant cross-section.

A full-size blades, blade segments may be composed of different number of segments composed of the chord length from the tip to the root, each blade segment is pultruded fragment having a constant cross section. Of course, most of the combination cylinder is constant from the tip to the root of the blade chord and has a constant cross-section. If the flange is preferably connected by a connection structure between the blade and the bolt, blade segments multistage fragment consisting of docking, which facilitates maintenance replacement.

Since the blade is subjected to a torque acts only longitudinally continuous fibers can not meet the required strength of the blade, fabric or felt may be introduced having a fiber distribution in the transverse pultrusion process. The result is a composite structure of the blade composed of longitudinal fibers and transverse fibers in the mix. Of course, the longitudinal and transverse fibers comprising fibers inclined at an angle to the placement. These can be achieved by a multi-axial fiber fabric.

To improve the vertical compressive stability of the blade, the blade may be introduced into the wall of solid foam sandwich material.

High velocity wind turbine blade is a blade must have a specific geometry of the airfoil lift to drag ratio for efficient aerodynamic performance. Further, since the difference in linear velocity of the movement from the tip to the root, to implement all vasopressin (blade infinitesimal segment) lengths over the blade aerodynamic angle of attack, the cross section must be constant along the blade fragment to the longitudinal direction of the blade ideal twist angle. This twisting is a cross section of the blade about the central axis A blade pitch setting of the twist. This twisting of the blade angle cured geometry.

Such a fiber composite blade may be carbon fibers, glass fibers, organic fibers or the like, or combinations thereof. Resin may be a polyester resin, an epoxy resin, an epoxy resin or the like group B women.

Thus, the particular cross-section and has a particular angle of twist of the fiber-reinforced resin composite material of the blade is achieved by the process described below:

Continuous fibers together after resin infiltration into a heated mold cavity under continuous traction mechanism acting tensile force, continued infiltration of the resin fibers traveling in a mold and subjected to chemical reaction after curing removed from the mold cavity, by after cooling to obtain a constant cross-section having a particular chord blade segments of a composite material. This is pultruded composite blade.

After the resin infiltration time and brought together the longitudinal continuous fibers laid transversely oriented fibers combined with fabric (multiaxial fabric, woven roving, etc.) or a fiber mat, continuously passed through a heated mold cavity, the reaction solidified and removed from the mold, cooled a composite material is obtained having a certain blade segments chord length of constant cross section. Introduction of transverse fibers will enhance the shear strength of the blade shell plate.

Resinated longitudinal continuous fibers pooled time and supplemented continuously depositing a solid foam core, continuously passed through a heated mold cavity, the reaction solidified and removed from the mold, after cooling to obtain a constant cross-section having a chord length of a particular composite blades fragments. Thus, the introduction of the sandwich material will greatly increase the ability of anti-buckling resistance of the compression force leaves.

When the mold cavity has a sufficient length and cross-section of the mold cavity is continuously twisted in one direction, the course of the reaction when the resin undergoes curing in the mold cavity moving, twisted shape to obtain a constant cross section. Thus, to achieve a constant cross-section for each piece of blade segments, the direction of the tip, the differential cross section of each pitch around the central axis from the root of the blade angle is continuously twisted. Since the blades are hollow structure, there must be a pultrusion mold cavity when the cavity mold and an outer mold in two parts, these two parts defining a shape of a hollow blade pull made. Also, because the skin structure of the blade must have a large transverse fibers are present, conventional pultrusion apparatus in the interior of the cavity, the inner mold part, on the outer mold supporting and fixing the technical solution can not be employed. The present invention employs a mold with a feeding inlet cantilevered support structure extends outside the mold cavity to the mold cavity of the support, so that the mold cavity can be suspended in an outer mold cavity.

When the running speed of the blade fragment is removed after hardening of the mold cavity shape, and the traction mechanism synchronized, surface roughening treatment provided a means of synchronization and a synchronization mechanism coated with a coating, can be completed blade outer protective coating automated continuous construction .

Since the portion of the blade airfoil leading edge and the spar cap and between the edges and the web can have a continuous longitudinal and transverse fibers, and there is no adhesive between the two half-shells in the conventional process contact surface binding. In this conventional blade glued joint surface defects are generally most likely to result in the broken blade force. Further, since each fiber prepreg together after molding, sufficient to ensure good wettability hook and a resin content of fiber, to avoid serious defects easily formed like current envelop white vane vacuum infusion molding processes exist. Further, since each fiber is always strictly stretched longitudinally, not how there is a loss modulus and strength in the axial direction of the woven fiber to bending.

Of the complete blade, the blade root and hub to have a natural transition structure connecting tip natural to have reduced eddy current losses and lightning protection tip sharp configuration. All of these shaped tip and the blade root structure, and a transition structure between different chord blade segments, the present invention is set forth not affect the essential characteristics of the pultrusion constant cross-section of the blade.

Constant cross-section of the blade according to the present invention, may be used a conventional vacuum infusion molding process or hand lay. But the most appropriate or pultrusion molding process.

The structural characteristics described above the blade and molding characteristics, below, to explain Ye Lun blades of this kind is composed of a technical features.

The invention is illustrated with the blades Ye Lun may be assembled in the two operating modes. One is given early pitch fan Ye Lun A contemporary variable pitch fan Ye Lun. Fixed pitch fan Ye Lun is defined as a single tubular body portion of the blade is fixedly connected to the hub, and only a tip portion can be rotated into small pieces, to play a part when adjusting the power and the pneumatic parking brake effect. Variable pitch fan Ye Lun cylinder interpreted as a single whole blade may rotate the wind vane angle adjustment to achieve the blade root may be achieved feathered parking brake.

Independent support its own Either bending force when Ye Lun, because the structure of the blade is too thin, can not be achieved independent arm mounting. Accordingly, there is need or cable truss support structure is fastened. After introduction of these connecting structure, the blade is changed from the original bending and axial compression forces state of coexistence is mainly affected by bending stress. Of course, for a certain blade thickness, and multi-point support of the blade, the blade longitudinal compression stability is sufficient. Rotation Ye Lun of the centrifugal force acting partly offset axial compression forces. For the span between the blade segments bear the bending stress and the size of the natural support points blade. This span may typically be in the range of 10m to design 30m.

At this point, we can conclude that a an impeller horizontal axis wind turbine blade composed of a constant cross-section composite materials, by the blades, blade attachment, the blade pitch mechanism, consisting of a hub, characterized in that: at least Ye Lun comprising three blades; Each blade along the longitudinal length of a period of constant cross-section comprising at least a fragment; linked together by a common support point distal the distal end Ye Lun axial coupling structure between the blades, although a cable-stayed structure, axial bearing force of the blade, the constraints that the deflection of the blade, there is located a transverse link structure within the blade surface of revolution, for carrying the transverse force transfer between the blade between the blade; coupling is formed between the coupling structures and the blades pneumatic working point of the segment positioned between the blade root and tip, which has a truss structure between the root and the hub constructed distinguished from the prior art.

This structure can withstand the action of the wind from the front of Ye Lun, and the use of the present invention is respected cable structure, so that the Ye Lun can be very lightweight. However, the biggest problem is that the wind can not withstand the action of the rear blowing under certain conditions. For this purpose, it is possible to design a guide variable structure, the blade is mounted to an angle of inclination of the Ye Lun structure. Each Ye Lun blade pitch axis and a pivot axis forming an angle greater than 90 degrees, the posture swept blade is mounted, linked together by a common rear Ye Lun supporting point between the rear end of the axial blade coupling structure.

Thus, a kind of summary given pitch structure of Ye Lun, and the link structure between the lateral blades, the front end of the axial coupling between the structure and the blade, are fixed to the rear end of the axial coupling between the coupling structure and the blade, which is fixed structurally constrained more than 80% of the blade length, located at the tip of the blade section, accounting for 20% of the length of the blade which is cantilevered portion of the blade segment, the mounting point has a rotating mechanism rotatably supporting the tip segment.

Thus, a variation summed pitch structure of Ye Lun, and the link structure between the lateral blades, the front end of the axial coupling between the structure and the blade, and the rear end of the blade axially between the coupling structures are coupled through a bearing activities.

Coupling to the bearing structure, and most preferably a non-metallic bearing is sealed bearings, dust to corrosion, anti-aging, but also should be a thrust bearing. Since the bearing of discontinuity is big, so, similar to a Teflon-based self-lubricating wear-resistant bearings to meet the requirements. From the set forth herein can be found using pultrusion process for producing a constant cross-section of a composite material of the blade, the blade itself has a low cost, high reliability advantages. While the lack of two, one is too thin, the limited ability to resist bending load independent, not full-size blade is cantilevered, it may be applied on the blade cable structure or truss structure is compensated; second is due to the constant cross-section, low aerodynamic efficiency to the current section of the blade becomes a complicated shape, which can be easily by increasing the length of the blade (increasing Ye Lun diameter) methods compensate for the lack of power.

Traditional models of designs, to reduce the cost of using two Ye Lun blades Ye Lun, Ye Lun, for a certain degree of real, bound to a high tip speed ratio, the high tip speed ratio will inevitably bring about a significant increase in the axial thrust on Ye Lun, blade itself significant increase in bending moment, bending moment and wind towers will increase significantly, to whom to pay extra reinforcement costs. Method of the invention as set forth, can in fact be used more thin blade type (e.g. 3 or 4 bladed Ye Lun blade) and a relatively low tip speed ratio [lambda], for example, the range of 6 <λ <10's.

Fan Ye Lun according to the present invention is to suppress vibration, wind shear load Ping Heng induced smooth load, the fatigue life of the blade and the spindle bearings and the like have a great advantage.

This configuration Ye Lun blade structure, due to an abnormal thin blades, blade segments and Each blade is assembled state, especially for offshore wind turbines of great significance, in one aspect, to improve reliability of the wind turbine, on the other hand, even if no replacement blade We need to remove the entire Ye Lun lifting, the individual blades or vanes and replace single segments.

BRIEF forth a 3MW wind turbine below in connection with the present invention, having a specific length 50m blades and vanes embodiments. BRIEF DESCRIPTION OF:

FIG. 1 is divided into a constant cross-sectional schematic view of three sections of the blade structure;

FIG 2 is a blade Ye Lun mounted state of a lateral schematic view;

FIG. 3 is a three blade impeller schematic axial view of a mounted state;

4 is a schematic perspective view the complete configuration of a three-bladed Ye Lun;

FIG 5 is a schematic diagram of a pultrusion method of the blade segment.

In FIG 1, 1 - Constant cross-sectional segments, 2 - connection point, 3 - tip, 4 - root

In FIG. 2, 1-- constant cross-sectional segments, 2 - connection point, 3 - tip, 4 - root, 5 - the front end of the axial coupling structure, 6 - distal common support point 7 - Front strut, the hub 8 _ , 9 _ common rear support point, 10 - the rear end of the axial coupling structure, 11-- hub flange.

3, 1-- constant cross-sectional segments, 2 - connection point, 3 - tip, 4 - blade root, 8 hub 12 - Horizontal link structure.

4, 1-- constant cross-sectional segments, 2 - connection point, 3 - tip, 4 - root, 5 - the front end of the axial coupling structure, 6 - distal common support point 7 - Front strut, the hub 8 _ , 9 _ common rear support point, 10 - the rear end of the axial coupling structure, 11-- hub flange, 12-- lateral connection structure, 13 of the nacelle, a tower 14.

5, the outer mold cavity 511-, 512- mold cavity, 513- cantilevered, 51-- fibers, 52 - resin tank, 53 - fiber cloth, 54 - a solid foam, 55 - cavity, 56- heat curing means 57 - traction means, a coarse synchronization apparatus 58-, 59- synchronizing spraying device, the cutting device 60, a fragment of a constant cross section. Specific embodiments:

Embodiment, the blade length 50m, 3 bladed Ye Lun structure of the present embodiment.

Is shown in FIG. 1 by the blade a blade segment constant cross-section of three sections, increases from the blade root to the blade tip chord length rung. And each section has a moderate twist angle. FIG L1 length 20m, L2 segment 20m, L3 segment 10m. Figure, three sections a constant cross-sectional segments 1 are combined into a blade. 2 is a connection point for fixing the connecting point of the blade, both the tip 3 is rectified and the mine structure, structure of the blade root 4 and the hub is connected. Right side view of FIG. 1 is a cross-sectional profile of FIG. It shows a hollow aerodynamic drag ratio characteristic structure shape favorable liters.

2, exhibits an axial direction Ye Lun blades mounted coupling state schematic, not shown schematically coupled to the loop between the blades. Other similar installation blade impeller. FIG, 8 in front of the front wheel strut 7, the front end of the axial coupling structure by the distal end 5 connected to the supporting point 6 with a common transfer and Ping Heng tension. The front end of the axial coupling structure 5 may be a truss or cable structure. The rear end of the axial coupling structure 10 joined together by a common rear support point 9. The rear end of the axial coupling structure 10 may be a cable structure or a truss structure. By connecting the blade 2 and the front end point of axial coupling structure 5, and the rear end 10 connected to the axial coupling structure. Wind Wind Figure 2 represents the operating state of the direction Ye Lun, Ye Lun windward state. 8 is connected to the hub through the blade root 4 and the wheel. Rely Ye Lun hub flange 11 and is connected to the nacelle spindle.

Most cartridge installation of a blade is not connected to the rear end of the axial structure 10, only the front end of the axial coupling structure 5, and as cable structure. This impeller fan from the beginning requires the installation of the wind direction will remain aligned with Ye Lun work, is also unable to withstand the wind force in the opposite direction.

Of course, the mounting angle between a horizontal rotating shaft and Ye Lun blades may be 90 °, may be larger than 90 °. Due to the limited space between the fan blades and the tower, therefore, an angle greater than 90 ° A better. Such a blade is mounted with a sweep of the latter posture. And current conventional blade mounted forward posture is completely different. This natural Ye Lun blades do not need to have a pre-curved shape.

In Figure 3, show a three blade Ye Lun of an axial view of the mounted state, it is a schematic diagram; for purposes of illustration lateral connection state between the blades. This coupling is located within the lateral surface of revolution of the blade. Not shown a schematic longitudinal coupling between the blades. Between three blades 12 coupled by a transverse coupling structure as a whole. This lateral coupling structure 12 may be a truss structure, it may be a cable structure. The most respected single tube cable structure. Such coupling structure realized by a thin blade impeller consisting of torque transmission and the carrier.

In FIG. 4, show a complete three-dimensional structural diagram of Ye Lun; shows the complete wind turbine blade Ye Lun case rely on a kind of light cable structure is formed.

In FIG. 4, a schematic of the assembly between the nacelle 13, tower 14, and Ye Lun. It is designed for operating on the wind direction. Of course, the Ye Lun may be mounted downwind of the assembly operation.

In FIG. 4, a fragment of a constant cross section through the blade root 4 and the hub 8 connected to the front end of the axial coupling structure 5, the rear end of the axial coupling structure 10 and the fixed blade by a connecting point. Effects of the distal end 6 and the common support point distance between the blade root 4 and the blade tip end size of the force of the axial coupling structure. Similarly, the rear end of the common support point 9 and the influence of the distance between the blade root 4 and the blade size of the force of the rear axial coupling structure. Axially coupling structure, and a lateral structure connecting the blade 2 fixed connection point. Coupling an axial bearing structure of the blade to the wind force, the lateral force torsional coupling structure of the blade carrier. Specific axial and transverse coupling structure is not limited to the illustrated cable.

Although in FIG. 4 is a schematic three-bladed Ye Lun, Ye Lun of the present invention may also be a multi-blade Ye Lun, characterized in that the link is the same. Further, the blade may be a single chord length from a blade tip to the blade root, it may also be a combination of multiple segments of different chord length of the blade segments. 2 position of the common connection point are arranged as needed, not necessarily at the junction between the two segments, the position of the connecting point of the blade 2 is located pneumatic working range segment.

If the multi-stage blade segments are combination products, the use of connecting flanges and the bolt connection structure as well, to the maintenance can be replaced between the segments next convenience.

This Ye Lun structure, since the coupling structure of the constraints, that the deflection of the blade is greatly reduced compared to the conventional blade cantilever mounted, always ensure the entire blade ideal aerodynamic angle of attack, so the wind capture efficiency is relatively mention 1¾.

Connection point in FIG. 42, in a fixed pitch in the performance of the fan wheel engaging a fixed structure, a dead link. A bearing structure for the performance of the link in variable pitch fan impeller.

When the link bearing, due to the stress is not large, it can employ a light weight corrosion resistant non-metallic bearing having self-lubricating properties of the PTFE bearing is the ideal choice.

5 illustrates a method of forming such composites pultrusion blade.

Resin tank 51 through the continuous fibers 52 of infiltration, the auxiliary laying fiber cloth 53 continuously introducing solid foam material 54, if necessary, combinations of these materials into the die cavity 55, reaction curing resins rapidly cured under the action of a heating device 56, after curing styling geometric shape required to have a constant cross-sectional segments 1.

Pultruded power from the traction mechanism 57 oriented walking traction.

Of course, the mold cavity 55 need to be long enough, and the cross-sectional profile of the cavity before twisting requires continuous composite blade can be manufactured with a specific angle of twist. The twist angle of this blade setting adapter required curing reaction rate and the pulling speed of the resin can be done. Cavities also depends on the length of the curing reaction rate and the pulling speed. By ply design, the introduction of asymmetry blade shell laminate structure, can also cause blade after curing natural twist.

5, the cross-section of constant cross-sectional segments AA 1 as a schematic view, which is a hollow structure, the mold cavity 55 by the outer mold cavity 511 and mold cavity 512.. Due to the presence of transverse fibers of the blade skin, it necessitates the boom 55 is located outside the cavity 513 to secure the support mold cavity 512, so that the mold cavity 512 is suspended in an outer mold cavity 511. Together into the fiber, resin, mold cavity fill material 55, cured shape, becomes a constant cross-sectional segments.

Of course, the configuration of the synchronizing device 58 and the synchronous coarse spray device 59, and a cutting means 60 and other auxiliary equipment follow, it forms a continuous production line. This process completely changed the blade manufacturing labor-intensive unfavorable situation at present. A significant reduction in the conventional process while vacuum bag film assisted molding material consumption and environmental pollution.

Such pultrusion forming blade having a precise geometry, it is possible to exhibit desirable aerodynamic characteristics.

After different device chord length of constant cross-sectional drawing of different blade profile, length and then cut into segments, further combinations of blades can be obtained our requirements.

The present invention realizes a low cost, high reliability, lightweight large diameter horizontal axis wind turbine blade

01

T86..0 / Zl0ZN3 / X3d 9SW00 / £ I0Z OAV

Claims

Rights request
1, one kind of constant cross-section fiber using the horizontal axis wind turbine blade reinforced resin composite material, having a contour characteristic of the typical aerodynamic structure, mainly composed of resins, fibers, a sandwich material, comprising: a direction containing at least the longitudinal length of the blade section of constant cross-section of blade segments, the blade segments by a plurality of blade segments, each segment having a particular blade chord length of constant cross section, for each piece of constant cross section of blade segments, the blade the direction of the root tip, the differential cross section of each pitch around the central axis of the torsion angle continuously.
2, the constant cross-section according to claim 1 a fiber-reinforced resin composite material of the blade, wherein: the flange is connected by the connecting structure between the segments and the bolts Each blade.
3, the constant cross-section according to claim 1 a fiber-reinforced resin composite material of the blade, wherein: the blade by the longitudinal fibers and transverse fibers in the mix, and a composite sandwich structure of the solid material into the foam constituted.
4. A horizontal wheel transverse axis by a constant cross-section wind turbine blade made of a composite material, by the blades, blade fixing structure, the blade pitch mechanism, consisting of a hub, characterized in that: at least three blade impeller; Each along containing at least the longitudinal length of the blade section of constant cross-sectional segments (1); impeller has a front end linked by a common support point (6) connected to an axial front end structure (5) between the blades, the blade inner surface of revolution positioned between the vanes transverse connecting structure (12); the connection point formed between the connecting structure and the blade (2) located between the pneumatic working section of the blade root and tip.
5, according to claim 4, wherein the horizontal axis wheel of constant cross-sectional wind turbine blade made of a composite material, characterized in that: each impeller blade pitch axis and a pivot axis forming an angle greater than 90 degrees, the blade swept installation posture, with a (9) linked to the rear wheel through a rear end axially connected to a common supporting point structure (10) between the blades.
6, according to claim 4, wherein the horizontal axis wheel of constant cross-sectional wind turbine blade made of a composite material, characterized in that: the impeller is an impeller fixed pitch structure, lateral coupling structure
(12) and the blade, the axial coupling between the front end structure (5) and the vane, the rear end of the axial coupling structure are fixed between the coupling (10) and the blade, this fixed blade configuration constraint length of more than 80% , located at the tip of the blade section, accounting for 20% of the length of the blade which is cantilevered portion of the blade segment, the mounting point has a rotating mechanism rotatably supporting the tip segment.
7, according to claim 4, wherein the horizontal axis wheel of constant cross-sectional wind turbine blade made of a composite material, characterized in that: a variable pitch impeller structure of the impeller, between the transverse connecting structure (12) and a blade , the axial coupling between the front end structure (5) and the blade, the axial coupling between the rear structure (10) and the blades are coupled by a coupling point bearing activity (2) position.
8, according to claim 4 and by the impeller 7 constant transverse horizontal axis wind turbine blade cross-sectional configuration of a composite material, wherein: the connection point (2) at a position bearing a non-metallic bearing.
9. A method of forming fibers of constant cross section of blade segments reinforced resin composite material, comprising a resin infiltration and resin curing process of the fiber, the blade segments are formed of constant cross section having a specific geometric profile, characterized in that: the continuous fiber after after wetting the resin pooled into a heated mold cavity, the mold cavity has a sufficient length and cross-section of the mold cavity is continuously twisted in one direction, a tensile force in a continuous traction mechanism, the resin infiltrates the fiber after removal of the mold cavity in the mold and continuing to walk through a chemical reaction and hardening, to achieve a constant cross section by having a specific chord length after cooling, torsional constant cross-section shape of the composite blade segments.
10, according to one of the fiber 9 a constant cross section forming methods blade segments reinforced resin composite material, as claimed in claim wherein: the resin infiltration time and brought together the longitudinal continuous fibers laid transversely oriented fibers combined with fabric or felt , continuously passed through a heated mold cavity, the mold was removed and the reaction solidified on cooling to obtain a composite material blade segments of constant cross section having a particular chord.
11, according to one of the fiber 9 a constant cross section forming methods blade segments reinforced resin composite material, as claimed in claim wherein: the resin infiltration time and brought together the longitudinal continuous fibers laid supplemented continuous solid foam core, continuous by heating the mold cavity, the mold was removed and the curing reaction, after cooling to obtain a composite material blade segments of constant cross section having a particular chord.
12, according to one of the fiber 9 a constant cross section forming methods blade segments reinforced resin composite material, as claimed in claim wherein: a constant cross-sectional segments of a pultrusion die there must be a hollow cavity of a mold (1) an outer mold (511) and a mold cavity (512) in two parts, the position of the feed inlet of the mold, with a cantilevered support structure extending outside of the mold cavity (513) to support the mold cavity (512) disposed in the suspended an outer mold cavity (511) in.
13, according to claim 9, one of the constant cross section of blade segments method of forming a fiber resin reinforced composite material, comprising: a coarse synchronization apparatus (58), - simultaneous spraying device
(59), and traction means (57) travel speed synchronization, complete removal of the constant cross-sectional segments of hardened shaped cavity (1) an outer protective coating of continuous construction.
PCT/CN2012/077981 2011-07-04 2012-06-30 Blade with constant cross section, forming method thereof, and horizontal axis wind turbine impeller comprised of the same WO2013004156A1 (en)

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CN102305174B (en) * 2011-07-04 2014-07-16 张向增 Blade with constant cross section, forming method and horizontal axis wind turbine impeller comprising same
CN102434384A (en) * 2011-11-11 2012-05-02 张向增 Novel composite material blade of horizontal shaft wind generating set
DE102012208428A1 (en) * 2012-05-21 2013-11-21 Evonik Industries Ag Pul-core process with PMI foam core
CN105003393B (en) * 2015-06-29 2017-12-12 东方电气(天津)风电叶片工程有限公司 Wind turbine blade leading edge protective layer having a function of de-icing anti-icing

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