WO2014161215A1

WO2014161215A1 - Wind turbine with full blade tips

Info

Publication number: WO2014161215A1
Application number: PCT/CN2013/075238
Authority: WO
Inventors: 戚永维
Original assignee: Qi Yongwei
Priority date: 2013-04-01
Filing date: 2013-05-07
Publication date: 2014-10-09
Also published as: CN103147926B; CN103147926A

Abstract

A wind turbine with full blade tips comprises a yaw platform (3) fixed on a tower (1), a horizontal blade impeller set mounted on the yaw platform (3), a power generator (4), and a hydraulic pipeline. The horizontal blade impeller set comprises an impeller body, blades (6) mounted on the outer edge (11) of the impeller body by a blade pitch varying device (12), and a transmission-braking integrated ring (5) fixed on the periphery of the impeller body; the impeller body and a hollow rotation shaft (8) are supported and connected together by a stay cable (13), a hinged end of the blade pitch varying device (12) is fixed on the bottom end of the blade (6), a blade motion supporting end (24) is provided on a hydraulic cylinder, and the pitch of the blade (6) is varied by stretching out and drawing back a piston rod of the hydraulic cylinder; and master brake calipers (15) are disposed at two sides of a master brake disc (16) on the hollow rotation shaft (8). The impeller body is designed rationally, the blade structure is simple, the wind turbine has complete hydraulic yaw and pitch varying functions, and all blade tips are evenly stressed, so the mounting and adjustment are simple and it is safe and reliable to use the wind turbine, thereby prolonging the service life of the whole machine.

Description

Full-tip wind turbine

[Technical Field]

The invention relates to a wind power generating device, in particular to a full-tip wind turbine with all the blades disposed on the outer rim supported by the triangular truss type support frame, which is suitable for various wind power generation places.

【Background technique】

At present, most of the large-scale horizontal-axis wind power generation devices that are widely used for wind power use a structure in which three blades are arranged on a conventional hub. Such a wind power device has few blades, and the wind force is small for the entire impeller, especially the root portion which accounts for about a quarter of the overall length of the blade. For the strength guarantee, the cylindrical structure is adopted, and the aerodynamic performance is zero; Two-quarters of the length is the middle. Because of its position, the torque produced is not as good as the tip of the blade for the same unit area. The tip is only about a quarter of the total length of the blade. The defense is over-deformed and the tip of the blade is narrow, so the aerodynamic performance is weak. The aerodynamic performance of the conventional blade is poor and cumbersome, and the intermediate wind resistance of the impeller is large. The material requirements are high, the efficiency is low, and the manufacturing cost is high. The large-blade hoisting transportation also restricts the development of large-scale wind power installations. The base is placed on a single tower with a height of several tens of meters. The load-bearing range varies from tens of tons to more than 200 tons depending on the capacity of the single unit. Such weight and height are supported by a single tower. Focusing on the unstable factors, the single-structure tower is restricted by the height limit of the crane and hoisting, it is difficult to obtain higher wind energy, and the motor-driven yaw and pitch system are complex, and the gearbox has a narrow speed range. The resulting generator is inefficient, and therefore, improvements to the above-described wind power generation apparatus have been the subject of general research by those skilled in the art.

The inventors have disclosed the "anti-high wind wind generator" with the bulletin number CN100467862C according to the problems of the mechanical strength difference, the difficulty of implementation and the practicability of the existing large-scale wind power generator, in order to solve the anti-destructive strong wind of the super large blade. A defect with poor ability. At the same time, the patents of the "Wind Wheel for Generating Electric Energy" with the publication number US005765990A and the "Energy Acquisition Wind Equipment with Combinable Devices" with the publication number DE20213062U1 are not suitable for large wind turbines. No. CN101603509A "Enhanced Wind Turbine", which is equipped with a rotary table platform and an impeller assembly assembled thereon. The air hood is provided. The two ends of the central shaft of the impeller group are assembled on the rotary table by bearings and bearing blocks. On the central shaft bracket, the main blade root is fixed to the blade connection sleeve on the central shaft. The tip of the blade is fixed on the rim of the impeller group, and the middle portion of the blade is fixed on the transmission support ring provided in the middle of the impeller, and the auxiliary blade is disposed between the transmission support ring and the rim. The transmission support ring directly meshes with the generator wheel, and the two ends of the central shaft respectively fix the stay cable fixing disc, one end of the stay cable is connected with the stay cable fixing disc, and the other end is fixed to the rim through the transmission support ring, the blade In the middle, a blade stay cable is connected with the stay cable fixing plate. Although the wind turbine uses the stay cable to provide safety technical guarantee for the manufacture of large impellers, it fundamentally solves the above problems of the existing large-scale wind turbines, but because the rotary table platform does not have a yaw drive device, the blade connection The methods, as well as the functions of pulping and braking, need to be improved, so the following defects are also present: First, the generator is in a high position, the stability is poor, and the implementation is difficult; the second is that the main and auxiliary blades respectively retain the blade root and the middle of the blade. Especially, the sub-blade is arranged between the transmission support ring and the rim, which is difficult and mechanically strong. It is difficult to guarantee. The main reason is that the rim of the single structure is used, and there is only one support point, so the blade cannot be placed on the rim.

In summary, the existing large-scale wind turbine blades generally have unreasonable settings, low blade efficiency, difficult implementation, and difficulty in securing mechanical strength. In addition, according to theoretical calculations, the blade tip of the same unit area is for the impeller. The resulting torque is much larger than the middle and root of the blade. Therefore, the structure of the existing blade is not suitable for the wind load requirements of high efficiency wind turbines.

[Summary of the Invention]

The object of the present invention is to provide a full-tip wind turbine generator, which fundamentally solves the problems of low efficiency, poor mechanical strength, and difficulty of implementation of existing wind turbine generators, and has reasonable wheel design and simple blade structure. With complete hydraulic yaw and pitch function, the whole blade tip is evenly stressed, easy to install and adjust, safe and reliable to use, and prolongs the service life of the whole machine.

The technical solution adopted by the invention is: the full-tip wind turbine comprises a yaw platform fixed on the tower, and the yaw platform is supported by the frame, the bearing seat, the hollow shaft and the stay cable. The horizontal axis impeller group, the generator and the hydraulic line, the technical points are: The horizontal axis impeller group comprises a wheel body composed of a triangular truss connecting two outer rims and one inner rim, assembled by a blade pitch device a blade on the outer rim of the wheel, and a driving brake integral ring fixed at a height of the outer periphery of the wheel; the inner rim of the wheel body and the traction flange on the hollow shaft are connected by a stay cable support, the blade The pitching device is assembled on the outer rim of the wheel, and the bottom end of the blade on the blade pitching device adopts a hinge or an articulated shaft to form a hinged end of the blade, and the upper end of the blade is used as a movable supporting end to be hinged with the piston rod end of the hydraulic cylinder, and passes through the piston The telescopic expansion of the rod completes the pitching of the blade; the main brake disc is arranged on both sides of the hollow shaft, and the main brake caliper fixed on the bearing housing or the frame is clamped on the main brake disc Between the upper and lower plates of the yaw platform, there are yaw bearings, a limit frame and a hydraulic motor-driven transmission for rotating the upper plate around the center of the lower plate; the yaw bearing is fixed at the bottom of the upper plate The upper ring of the inner ring gear is fixed to the lower ring of the upper part of the lower plate. The rolling wheel is arranged in the upper and lower ring channels of the bearing. The two ends of the rolling wheel shaft are assembled by bearings on the support frame extended by the upper ring of the bearing. .

The yaw platform is supported by at least three towers.

The output pipe of the hydraulic oil pipe in the hydraulic pipeline is inserted into the hollow rotating shaft through a hydraulic rotary joint fixed on the bearing housing, and is led out from the oil pipe through hole of the hollow rotating shaft to the wheel body, and the oil return pipe of the hydraulic oil pipe passes through the oil pipe of the hollow rotating shaft. The hole is introduced, and the hollow rotating shaft is led out by a hydraulic rotary joint fixed to the bearing housing, and is connected to the oil tank.

The hydraulic oil pipe of the hydraulic pipe, the output pipe is inserted into the hollow rotating shaft through a hydraulic rotary joint fixed on the bearing housing, and is led out from the oil pipe through hole of the hollow rotating shaft to the wheel body, and the oil return pipe on the wheel body is from the oil pipe of the hollow rotating shaft The through hole is introduced, and the hollow rotating shaft is led out through a hydraulic rotary joint fixed to the bearing housing, and is connected to the oil tank.

A pair of brake calipers fixed on the yaw platform are disposed on both sides of the integrated drive brake ring.

The outer circumference of the driving brake integral ring is closely connected with the transmission wheel of the transmission wheel generator fixed on the yaw platform Touch.

The outer circumference of the driving brake integral ring is fixed with a permanent magnet as a generator rotor through a magnetic isolation insulating spacer, and a permanent magnet direct drive generator is formed as a winding group of the stator in a base fixed on the yaw platform.

The advantages and positive effects of the present invention are as follows: The full-tip wind turbine is as the name suggests to abandon the blade root of the conventional wheel body with zero aerodynamics and the middle of the blade with poor aerodynamicity, all adopting a high-efficiency blade tip, the wheel The cable-stayed support between the traction flange at both ends of the hollow shaft and the inner rim of the triangular truss replaces the support of the traditional wheel body and the blade, and the blades are all disposed on the outer rim of the triangular truss. Because the cross-section of multiple cable stays is less than one-half of the existing conventional wheel roots, the wheel design is reasonable and the blade structure is simple. The whole blade tip is evenly stressed, which not only reduces the windward surface of the wheel body, but also increases the area of the blade tip with high efficiency. It is safe and reliable, and also prolongs the service life of the whole machine. It fundamentally solves the problems of thick and bulky, inefficient, poor mechanical strength and complicated structure of existing wind turbine blades. Since ancient times, people have used traditional wheel structures to ensure their strength. Since the number and unit area of the wheel blades of the present invention are greatly increased, the torque can be multiplied by the same amount as the prior art, although the impeller diameter is the same. Since the hydraulic cylinder of the blade pitching device provided on the outer rim of the triangular truss can be expanded and contracted, the purpose of pitching can be completed, and therefore, the hydraulic yaw and pitch function are completed, and the operation is simple and quick. The drive brake integrated ring directly drives the drive wheel generator or drives the permanent magnetic direct drive generator, which does not require a gearbox, and has a wide speed range and can be used as a secondary brake disc. When braking, the auxiliary brake calipers on the yaw platform clamp the sides of the drive brake integrated ring, which can achieve the purpose of braking.

[Description of the Drawings]

The invention is further described below in conjunction with the drawings.

Figure 1 is a schematic view of a specific structure of the present invention;

Figure 2 is a partial enlarged cross-sectional view taken along line A-A of Figure 1;

3 is a schematic view showing the specific structure of a permanent magnet direct-drive power generation according to the present invention.

The serial number in the figure shows: 1 tower, 2 yaw bearing, 3 yaw platform, 4 drive wheel generator, 5 drive brake integrated ring, 6 blades, 7 racks, 8 hollow shafts, 9 bearing seats, 10 inner wheels Edge, 11 outer rim, 12 blade pitcher, 13 stay cable, 14 traction flange, 15 main brake caliper, 16 main brake disc, 17 hydraulic hose, 18 hydraulic rotary joint, 19 tubing through hole, 20 triangular truss , 21 hydraulic motor, 22 limit frame, 23 blade hinged end, 24 blade movable support end, 25 guide slide, 26 magnetic isolation gasket, 27 permanent magnet, 28 winding group, 29 base, 30 blade support .

【detailed description】

The specific structure of the present invention will be described in detail based on Figs. The full-tip wind turbine includes a yaw platform 3 fixed to the tower 1 and assembled on the yaw platform 3 with a horizontal axis supported by the frame 7, the bearing housing 9, the hollow shaft 8 and the stay cable 13. The impeller group, the generator and hydraulic piping assembled on the yaw platform 3.

The yaw platform 3 is supported by at least three towers 1. The specific implementation method is: inserting the first section of each tower 1 into the reserved hole of the yaw platform 3, and fixing it to the ground or horizontal foundation. A crane is placed on the inner wall of the tower 1 (not shown) Shown) After the mutual aid is raised, the rack 7 is assembled and the horizontal axis impeller assembly is assembled. With the support of the plurality of towers 1, the yaw platform 3 and above is raised to the top end of the tower 1 by the combination of lifting and jacking, and only a small crane can break through the limitation of the height limit of the large crane. . Between the upper and lower plates of the yaw platform 3, a yaw bearing 2, a limit frame 22 and a transmission device driven by a hydraulic motor 21 for rotating the upper plate around the center of the lower plate are provided. The yaw bearing 2 includes a bearing upper ring with an internal ring gear fixed at the bottom of the upper platen, a bearing lower ring fixed at the upper part of the lower platen, and a rolling wheel is disposed in the upper and lower ring channels of the bearing, and both ends of the rolling wheel shaft pass A bearing (not shown) is assembled on the support frame from which the upper ring of the bearing extends. The transmission driven by the hydraulic motor 21 is constituted by the meshing of the inner ring gear of the yaw bearing 2 and the gear driven by the hydraulic motor 21.

The horizontal axis impeller assembly assembled on the yaw platform 3 includes a truss-structured wheel body formed by connecting the two outer rims 11 and one inner rim 10 by means of a triangular truss 20, which is assembled outside the wheel by the blade pitching device 12. The blade 6 on the rim 11 and the transmission brake integral ring 5 and the like which are fixed to the top end of the support frame which protrudes from the outer periphery of the wheel. The hollow shaft of the wheel body is assembled on the bearing housing 9 by bearings at both ends, and the main brake disc 16 and the traction flange 14 are symmetrically fixed at both ends of the hollow shaft 8 respectively. The inner rim 10 of the wheel body is coupled to the traction flange 14 on the hollow shaft 8 by means of a stay cable 13. The stay cable 13 can be arranged in a manner of bicycle spokes or a tilting cable of a Ferris wheel, one end of which is fixedly connected to the traction flange 14 and the other end of which is fixedly connected to the inner rim 10 of the wheel body. In actual installation, the corresponding cable staying cable 13 can be inserted and fixed, that is, the stay cable 13 passes through the hole of the traction flange 14 in the obliquely pulled position, and is fixed to the hole of the corresponding end traction flange 14 for the purpose. It is to balance the axial force generated by the fixed end of the stay cable 13 to the hollow shaft 8.

A plurality of blade pitching devices 12 are evenly assembled on the two parallel outer rims 11 of the wheel body. Each of the blade pitching devices 12 includes a joint fixed to the outer rim 11 (the shape can be set according to pitch requirements), a blade hinge end 23, a blade movable support end 24, a guide slide 25 and a blade support frame 30, and the like. The blade support frame 30 can be placed on the connector as needed. The bottom end of the blade 6 on the blade pitching device 12 may constitute a blade hinge end 23 by means of a hinge or hinge shaft (not shown), and the upper end of the blade 6 serves as a movable supporting end 24 and a piston of a hydraulic cylinder (not shown). The rod ends are hinged together, and the pitch of the blades 6 is completed by the expansion and contraction of the piston rods; the main brake discs 16 are disposed on both sides of the hollow shaft 8, and the main brake calipers 15 respectively fixed on the bearing housing 9 or the frame 7 are clamped at Both sides of the main brake disc 16. When braking, the main brake caliper 15 clamps the two sides of the main brake disc 16 to achieve the purpose of braking.

According to the blade hinge end 23 of the blade pitching device 12 and the blade movable supporting end 24, the blade 6 can be connected and pitched in two embodiments. In the present embodiment, the following two solutions all refer to the clockwise rotation of the impeller. . Solution 1: The hinged end 23 of the blade is fixed to the bottom end of the blade 6 by a hinge or an articulated shaft. The upper end of the blade is a movable supporting end 24, and the piston rod end of the hydraulic cylinder is hinged at the movable supporting end 24 of the blade, and the blade is driven by the expansion and contraction of the piston rod. 6 is turned around the blade hinge end 23 by a certain angle to complete the pitching of the blade 6. Solution 2: The blade hinge end 23 is fixed to the left end of the blade 6 by a hinge or a hinge shaft, and the right end of the blade is provided with a hydraulic cylinder for the movable support end 24, and the piston rod end of the hydraulic cylinder is hinged at the movable end 24 of the blade, and is extended and contracted by the piston rod. While moving the blade movable supporting end 24 along the guiding chute 25, driving the blade 6 around the blade The hinged end 23 of the piece rotates to complete the pitching of the blade 6.

The generator of the present invention can adopt two embodiments. Solution 1: As shown in FIG. 1, the outer circumference of the transmission brake integrated ring 5 is in close contact with the transmission wheels of the plurality of transmission wheel generators 4 fixed on the yaw platform 3. . The drive brake integrated ring 5 transmits power to the drive wheel generator to achieve power generation. Solution 2: As shown in FIG. 3, the outer circumference of the transmission brake integral ring 5 is fixed with a permanent magnet 27 as a generator rotor through a magnetic isolation spacer 26, and is wound around the base 29 fixed on the yaw platform 3 as a stator. The wire set 28 constitutes a permanent magnet direct drive generator. The drive brake integrated ring 5 transmits power to the permanent magnetic direct drive generator to achieve the purpose of power generation. The basic technical parameters of the stator winding group 28, the rotor permanent magnet 27 and the blade 6 assembled in the frame 29 of the permanent magnet direct-drive generator and the specifications and quantities thereof shall be referred to the specifications and basis of the existing generator. Actual use needs to be determined. In this embodiment, the winding group 28 and the frame 29 of the stator are of an open structure, and the length does not exceed the yaw platform 3, and the permanent magnets 27 provided on the outer rim 11 have the same arc rotation and the height is uniform, and the winding group 28 is Features a protective film.

When the transmission brake integrated ring 5 is used as the auxiliary brake disk, the brake calipers 5 are provided on both sides with a secondary brake caliper (not shown) fixed on the yaw platform. When braking, the auxiliary brake caliper clamps the two sides of the transmission brake integral ring 5 as the auxiliary brake disc to achieve the purpose of braking.

The hydraulic lines are fixed to the frame 7 and the housing 9 housing. The output pipe and the return pipe (not shown) of the hydraulic oil pipe 17 in the hydraulic line are in communication with the prime mover, the hydraulic pump, and the oil tank (not shown). The hydraulic oil pipe 17 is inserted into the hollow shaft 8 through the hydraulic rotary joint 18, and is led out from the oil pipe through hole 19 of the hollow rotary shaft 8 to the wheel body, and is directly connected to the hydraulic cylinder of the blade pitch device 12. The oil return pipe of the hydraulic oil pipe is introduced from the oil pipe through hole 19 of the hollow rotary shaft 8, and the hollow rotary shaft 8 is connected to the oil tank through a hydraulic rotary joint 18 fixed to the outer casing of the bearing housing 9. The hydraulic circuit of the hydraulic motor 21 is in direct communication with the prime mover, the hydraulic pump, and the fuel tank (not shown).

The two outer rims 11 and one inner rim 10, the yaw bearing 2 and the yaw platform 3, which constitute the wheel truss structure, can be manufactured in sections to facilitate sectional transportation and on-site assembly and adjustment.

Claims

Rights request

1. A full-tip wind turbine, including a yaw platform fixed on the tower, a horizontal-axis impeller assembly assembled on the yaw platform supported by a frame, a bearing seat, a hollow rotating shaft and a cable stay, and generates electricity machine and hydraulic pipeline, characterized in that: the horizontal axis impeller assembly includes a wheel body composed of two outer rims and an inner rim connected by a triangular honing frame, and the blades are assembled on the outer rim of the wheel through a blade pitch device. , and a transmission brake integrated ring fixed on the periphery of the wheel body at the height of the protruding blades; the inner rim of the wheel body and the traction flange on the hollow rotating shaft are connected together using stay cable support, and the blade pitch changing device is assembled outside the wheel body. On the rim, the bottom end of the blade on the blade pitch device uses a hinge or a hinge shaft to form the hinged end of the blade. The upper end of the blade serves as a movable support end and is hinged with the piston rod end of the hydraulic cylinder, and the blade changes are completed through the expansion and contraction of the piston rod. Propellers; main brake discs are provided on both sides of the hollow rotating shaft, and main brake calipers fixed on the bearing seat or frame are clamped on both sides of the main brake disc; a yaw bearing is provided between the upper and lower platform of the yaw platform , limit frame and a transmission device driven by a hydraulic motor that rotates the upper platform around the center of the lower platform; the yaw bearing includes an upper bearing ring with an internal gear ring fixed at the bottom of the upper platform, and a lower bearing ring fixed at the upper part of the lower platform. Rolling wheels are provided in the channels of the upper and lower rings of the bearing, and the two ends of the rolling wheel shaft are assembled on the support frame extended from the upper ring of the bearing through the bearings.

2. The full-tip wind turbine according to claim 1, characterized in that: the yaw platform is supported by at least three towers.

3. The full-tip wind turbine according to claim 1, characterized in that: the output pipe of the hydraulic oil pipe in the hydraulic pipeline is inserted into the hollow rotating shaft through a hydraulic rotary joint fixed on the bearing housing shell, and is connected from the hollow rotating shaft. The oil pipe through hole is led to the wheel body, and the oil return pipe of the hydraulic oil pipe is introduced from the oil pipe through hole of the hollow rotating shaft. It is led out of the hollow rotating shaft through the hydraulic rotary joint fixed on the bearing housing shell and connected to the oil return tank.

4. The full-tip wind turbine according to claim 1, characterized in that: auxiliary brake calipers fixed on the yaw platform are provided on both sides of the transmission brake integrated ring.

5. The full-tip wind turbine according to claim 1, characterized in that: the outer periphery of the transmission brake integrated ring is in close contact with the transmission wheel of the transmission wheel generator fixed on the yaw platform.

6. The full blade tip wind turbine according to claim 1, characterized in that: the outer periphery of the transmission brake integrated ring is fixed with a magnetic isolation insulating gasket as a generator rotor, and is fixed on the yaw platform. The winding group as the stator in the machine base constitutes a permanent magnet direct drive generator.

7. The full-tip wind turbine according to claim 1, characterized in that: the cable-stayed cable at the corresponding part is passed through the hole of the traction flange at the cable-stayed position and connected to the corresponding end traction flange. fixed in the hole.