Wind turbine generator set

Abstract

The present invention discloses a wind turbine generator set, comprising: a tower barrel, a wind wheel, a nacelle and a high-voltage chamber; the nacelle includes: a main frame, a front frame assembly, a rear frame assembly and a main drive system; the main drive system includes: a main shaft, a bearing seat, a speed increaser, a coupling and a generator; the bearing seat is arranged at the front part of the main frame, the speed increaser is installed at the rear part of the main frame through an elastic support, the main shaft passes through the bearing seat and is connected to the front end of the speed increaser, and the generator is arranged in the rear frame assembly; the front frame assembly is arranged on the main frame, and the upper front part of the rear frame assembly is hinged to the tail of the front frame assembly, and the lower front part of the rear frame assembly is detachably hinged to the tail of the main frame for completing downward deflection correction; the nacelle is connected to the tower barrel through a yaw system, the wind wheel is connected to the main shaft, and the high-voltage chamber is connected to the lower part of the rear frame assembly. It has a light overall weight, small size and low cost, can increase the elevation angle and blade clearance, and is convenient for production organization and transportation.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and particularly to a wind turbine generator set. Background Art

[0002] Wind energy is one of the most representative renewable energy sources, which is of great significance for protecting the environment and maintaining ecological balance, reducing dependence on conventional energy sources and improving the energy structure.

[0003] There are significant differences in wind resources in various regions of our country. In order to meet the differentiated needs of different sub-markets and reduce product costs, it is often necessary to develop a series of wind turbine generator sets. When the wind turbine generator sets are equipped with blades of different specifications, there is often a problem of too small clearance between the blades and the tower barrel. If customized structural components such as the frame and hub are developed according to the blade conditions, the elevation angle and cone angle of the wind turbine generator set can be increased, thereby increasing the clearance distance, but the cost is increased, and too many product series are also not conducive to production organization. A large number of devices are arranged in the nacelle of some wind turbine generator sets, causing large downward deflection deformation of the nacelle, which has an adverse impact on the assembly and adjustment of equipment such as the main drive system and the nacelle cover. Summary of the Invention

[0004] To solve some or all of the above technical problems existing in the prior art, the present invention provides a wind turbine generator set. The technical solution is as follows:

[0005] A wind turbine generator set is provided, including: a tower barrel, a wind wheel, a nacelle and a high-voltage chamber; the nacelle includes: a main frame, a front frame assembly, a rear frame assembly and a main drive system; the main drive system includes: a main shaft, a bearing seat, a speed increaser, a coupling and a generator; the bearing seat is arranged at the front part of the main frame, the speed increaser is installed at the rear part of the main frame through an elastic support, the main shaft passes through the bearing seat and is connected to the front end of the speed increaser, the rear end of the speed increaser is connected to the front end of the coupling, the rear end of the coupling is connected to the generator, and the generator is arranged in the rear frame assembly; the front frame assembly is arranged on the main frame, and the upper part of the front end of the rear frame assembly is hinged to the tail of the front frame assembly, and the lower part of the front end of the rear frame assembly is detachably hinged to the tail of the main frame for completing downward deflection correction; a detachable backing plate is arranged between the bearing seat and the main frame for adjusting the elevation angle of the bearing seat; a height-adjustable front support and a rear support are arranged between the generator and the rear frame assembly for adjusting the angle of the generator; the nacelle is connected to the tower barrel through a yaw system, the wind wheel is connected to the main shaft, and the high-voltage chamber is connected to the lower part of the rear frame assembly.

[0006] In some alternative implementation manners, the wind wheel includes blades, a hub assembly, a hub cover, and a combined ladder. There are three manholes provided on the hub assembly. The combined ladder includes three first flexible ladders, three second flexible ladders, and a hexagonal rigid ladder. Each of the first flexible ladders is respectively connected to an arc connection point and one side of the hexagonal rigid ladder, and each of the second flexible ladders is respectively connected to a flange connection point and one side of the hexagonal rigid ladder. The first flexible ladders and the second flexible ladders are distributed at intervals.

[0007] In some alternative implementation manners, a front bearing sleeved on the main shaft is provided at the front bearing hole of the bearing housing. A front shaft sleeve, a front end cover, and a monitoring device are provided at the front bearing. A rear bearing sleeved on the main shaft is provided at the rear bearing hole of the bearing housing. A rear end cover, a rear shaft sleeve, and a compression ring are provided at the rear bearing. The compression ring is used to apply an axial pre-tightening force to the bearing and its compression amount is adjustable. The monitoring device is used to detect the pre-tightening degree of the bearing.

[0008] In some alternative implementation manners, clamping bosses are symmetrically arranged on the inner side of the large end of the main shaft, facilitating positioning and clamping during the machining of the main shaft; the outer contour arc surface of the part of the main shaft near the flange is composed of multiple sections of curves, and the inner cavity arc surface is also composed of multiple sections of curves; in the regions of the main shaft near the edges of the bearing race, the front shaft sleeve, and the rear shaft sleeve, a first group of unloading grooves and a second group of unloading grooves composed of multiple sections of arcs are respectively provided; a step is provided at the small end of the main shaft to stagger multiple load-bearing parts from each other.

[0009] In some alternative implementation manners, the main frame is a combined curved surface box girder structure, which includes a first cover plate, a lower cover plate, a web plate, a second cover plate, a third cover plate, a flange plate, a plug plate, a lower cover plate of the support leg, and an adjustment seat; the first mounting hole of the first cover plate is connected to the bearing seat, the second mounting hole is connected to the torque arm of the speed increaser, the third mounting hole is connected to the front nacelle lifting point of the front frame assembly, the fourth mounting hole is connected to the column of the front frame assembly, and a part of the first cover plate where the second mounting hole and the fourth mounting hole are located sinks; the bearing mounting hole and the brake mounting hole of the lower cover plate are respectively connected to the yaw bearing and the yaw brake of the yaw system; the web plate is provided with a nacelle manhole, which serves as a personnel passage between the nacelle and the tower barrel, and the web plate is provided with side wire outlet holes for cable layout and also serves to reduce weight; the middle front part of the first cover plate, the lower cover plate, the web plate, and the second cover plate together form a downward concave approximate annular box girder structure for accommodating the bearing seat; the flange plate is provided with a yaw drive mounting hole and a nacelle cover elastic support mounting hole; the plug plate is provided with a first cable hole for laying the cable from the high-voltage chamber to the bottom of the tower barrel, and the plug plate is provided with an adjustment seat mounting hole for mounting the adjustment seat; the lower cover plate of the support leg is provided with a second cable hole; the rear part of the first cover plate, the third cover plate, the plug plate, and the lower cover plate of the support leg together form two open box girder legs for accommodating the speed increaser, the first cover plate is connected to the torque arm of the speed increaser and the column of the front frame assembly, and the plug plate is connected to the rear frame assembly through the adjustment seat; the adjustment seat includes a first pin shaft seat, an adjustment pad, and an adjustment bolt, and the first pin shaft seat and the adjustment pad are connected to the fourth pin shaft seat and the second pin of the rear frame assembly.

[0010] In some alternative implementation manners, the nacelle further includes a wind turbine locking device, which includes a wind turbine locking disk and a locking pin. The wind turbine locking disk is arranged on the main shaft, and the locking pin is telescopically arranged in the locking pin hole of the bearing seat and is used to insert into the wind turbine locking disk when extended to make the wind turbine stationary.

[0011] In some alternative implementation manners, the front frame assembly, the rear frame assembly, and the main frame together form a truss structure. The front frame assembly is connected to the first cover plate of the main frame through the front nacelle lifting point and the column, and is hinged to the upper front end of the rear frame assembly through the second pin shaft seat, the third pin shaft seat, and the first pin; the lower front end of the rear frame assembly is hinged to the plug plate on the main frame through the first pin shaft seat, the fourth pin shaft seat, and the second pin.

[0012] In some alternative implementations, the nacelle further includes a nacelle cover, which includes a body, a front forehead, a tower barrel hole, a high-voltage chamber hole, a first exhaust hole, a second exhaust hole, a meteorological rack, and elastic supports for the nacelle cover; the front forehead bulges at the connection part with the hub cover to provide a passage for personnel; the tower barrel hole envelopes the top of the tower barrel to make the connection part between the nacelle and the tower barrel as airtight as possible; the high-voltage chamber hole envelopes the upper part of the high-voltage chamber to prevent the high-voltage chamber from being exposed to rain; the first exhaust hole and the second exhaust hole are used to discharge the hot air in the nacelle, and the nacelle cover is connected to the front frame assembly, the rear frame assembly, and the main frame through the elastic supports for the nacelle cover.

[0013] In some alternative implementations, the high-voltage chamber is suspended below the rear frame assembly, and its upper part is located inside the nacelle cover; an inverter and a transformer are arranged in the high-voltage chamber, the generator is connected to the inverter and the transformer through cables, and the transformer is connected to the wind farm substation or the power grid through cables; the electric energy output by the generator is boosted by the inverter and the transformer and then transmitted to the tower bottom.

[0014] In some alternative implementations, the transformer and the inverter are separated by a partition to reduce the risk of high voltage; an intake fan is equipped at the lower part of the high-voltage chamber to introduce outside cold air to cool the inverter, the transformer, the generator, and the speed increaser in the nacelle; an exhaust fan is arranged on the side of the high-voltage chamber close to the transformer to discharge the hot air of the transformer nearby; the inverter directly discharges its own hot air out of the high-voltage chamber through its own exhaust port.

[0015] The main advantages of the technical solution of the present invention are as follows:

[0016] The wind turbine generator set of the present invention is light in overall weight, small in size, and low in cost, and can increase the elevation angle and blade clearance, which is convenient for production organization and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 is a schematic diagram of the overall structure of the wind turbine generator set provided by an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the main part (including the nacelle, the hub assembly, and the high-voltage chamber) of the wind turbine generator set provided by an embodiment of the present invention;

[0020] Figure 3It is a top view of the main part of a wind turbine provided by an embodiment of the present invention;

[0021] Figure 4 It is provided by an embodiment of the present invention Figure 3 A-A cross-sectional view of;

[0022] Figure 5 It is provided by an embodiment of the present invention Figure 4 Axonometric view of;

[0023] Figure 6 It is a front view of the main drive system, main frame, and rear frame assembly in the state where the elevation angle is A provided by an embodiment of the present invention;

[0024] Figure 7 It is a front view of the main drive system, main frame, and rear frame assembly in the state where the elevation angle is increased to B provided by an embodiment of the present invention;

[0025] Figure 8 It is provided by an embodiment of the present invention Figure 3 B-B cross-sectional view of;

[0026] Figure 9 It is provided by an embodiment of the present invention Figure 8 Partial enlarged view at I in;

[0027] Figure 10 It is provided by an embodiment of the present invention Figure 8 Partial enlarged view at II in;

[0028] Figure 11 It is a front view of the bearing housing provided by an embodiment of the present invention;

[0029] Figure 12 It is a top view of the bearing housing provided by an embodiment of the present invention;

[0030] Figure 13 It is a side view of the speed increaser provided by an embodiment of the present invention;

[0031] Figure 14 It is a front view of the main frame provided by an embodiment of the present invention;

[0032] Figure 15 It is a top view of the main frame provided by an embodiment of the present invention;

[0033] Figure 16 It is an F-direction view of the main frame provided by an embodiment of the present invention;

[0034] Figure 17 It is a D-D cross-sectional view of the main frame provided by an embodiment of the present invention;

[0035] Figure 18It is an E-E cross-sectional view of the main frame provided by an embodiment of the present invention;

[0036] Figure 19 It is an F-F cross-sectional view of the main frame provided by an embodiment of the present invention;

[0037] Figure 20 It is a front view of the main frame, front frame assembly, rear frame assembly, and nacelle provided by an embodiment of the present invention;

[0038] Figure 21 It is a front view of the high-voltage chamber provided by an embodiment of the present invention;

[0039] Figure 22 It is provided by an embodiment of the present invention Figure 21 G-direction view of

[0040] Explanation of reference numerals:

[0041] 1 Tower barrel, 2 Wind turbine, 3 Nacelle, 4 High-voltage chamber.

[0042] 2 Wind turbine: 2-1 Blade, 2-2 Hub assembly, 2-3 Hub cover, 2-4 Composite ladder;

[0043] 2-2 Hub assembly: 2-2-1 Hub manhole, 2-2-2 Arc connection point, 2-2-3 Flange connection point;

[0044] 2-4 Composite ladder: 2-4-1 First flexible ladder, 2-4-2 Second flexible ladder, 2-4-3 Hexagonal rigid ladder;

[0045] 3 Nacelle: 3-1 Main drive system, 3-2 Main frame, 3-3 Yaw system, 3-4 Wind turbine locking device, 3-5 Front frame assembly, 3-6 Rear frame assembly, 3-7 Nacelle cover;

[0046] 3-1 Main drive system: 3-1-1 Main shaft, 3-1-2 Front bearing, 3-1-3 Front shaft sleeve, 3-1-4 Front end cover, 3-1-5 Monitoring device, 3-1-6 Bearing seat, 3-1-7 Rear bearing, 3-1-8 Rear end cover, 3-1-9 Rear shaft sleeve, 3-1-10 Compression ring, 3-1-11 Elastic support for speed increaser, 3-1-12 Speed increaser, 3-1-13 Coupling, 3-1-14 Brake, 3-1-15 Generator, 3-1-16 First backing plate, 3-1-17 Second backing plate, 3-1-18 Third backing plate, 3-1-19 Fourth backing plate;

[0047] 3-1-1 Main shaft: 3-1-1-1 Clamping boss, 3-1-1-2 Inner cavity arc surface, 3-1-1-3 Outer contour arc surface, 3-1-1-4 First group of unloading grooves, 3-1-1-5 Second group of unloading grooves, 3-1-1-6 Step, 3-1-1-7 Oil hole;

[0048] 3-1-6 Bearing Seat: 3-1-6-1 Frame Mounting Hole, 3-1-6-2 Front Bearing Hole, 3-1-6-3 Rear Bearing Hole, 3-1-6-4 Locking Pin Hole, 3-1-6-5 Observation Hole;

[0049] 3-1-12 Speed Increaser: 3-1-12-1 Housing Axis, 3-1-12-2 Torque Arm;

[0050] 3-2 Main Frame: 3-2-1 First Cover Plate, 3-2-2 Lower Cover Plate, 3-2-3 Web, 3-2-4 Second Cover Plate, 3-2-5 Third Cover Plate, 3-2-6 Flange Plate, 3-2-7 Plug Plate, 3-2-8 Lower Leg Cover Plate, 3-2-9 Adjusting Seat;

[0051] 3-2-1 First Cover Plate: 3-2-1-1 First Mounting Hole, 3-2-1-2 Second Mounting Hole, 3-2-1-3 Third Mounting Hole, 3-2-1-4 Fourth Mounting Hole;

[0052] 3-2-2 Lower Cover Plate: 3-2-2-1 Bearing Mounting Hole, 3-2-2-2 Brake Mounting Hole;

[0053] 3-2-3 Web: 3-2-3-1 Cabin Manhole, 3-2-3-2 Side Cable Outlet Hole;

[0054] 3-2-6 Flange Plate: 3-2-6-1 Yaw Drive Mounting Hole, 3-2-6-2 Elastic Support Mounting Hole for Cabin Cover;

[0055] 3-2-7 Plug Plate: 3-2-7-1 First Cable Hole, 3-2-7-2 Adjusting Seat Mounting Hole;

[0056] 3-2-8 Lower Leg Cover Plate: 3-2-8-1 Second Cable Hole;

[0057] 3-2-9 Adjusting Seat: 3-2-9-1 First Pin Shaft Seat, 3-2-9-2 Adjusting Pad, 3-2-9-3 Adjusting Bolt;

[0058] 3-3 Yaw System: 3-3-1 Yaw Bearing, 3-3-2 Yaw Drive, 3-3-3 Yaw Brake, 3-3-4 Yaw Brake Disc;

[0059] 3-4 Wind Turbine Locking Device: 3-4-1 Wind Turbine Locking Disc, 3-4-2 Locking Pin;

[0060] 3-5 Front Frame Assembly: 3-5-1 Front Frame, 3-5-2 Column, 3-5-3 Second Pin Shaft Seat, 3-5-4 Front Hoisting Point of Cabin;

[0061] 3 - 6 Rear Frame Assembly: 3 - 6 - 1 Rear Frame, 3 - 6 - 2 Third Pin Seat, 3 - 6 - 3 Fourth Pin Seat, 3 - 6 - 4 Hanging Point, 3 - 6 - 5 First Front Bracket, 3 - 6 - 6 First Rear Bracket, 3 - 6 - 7 Cable, 3 - 6 - 8 Second Front Bracket, 3 - 6 - 9 Second Rear Bracket, 3 - 6 - 10 First Pin, 3 - 6 - 11 Second Pin, 3 - 6 - 12 Rear Hanging Point of the Machine Cabin;

[0062] 3 - 7 Machine Cabin Cover: 3 - 7 - 1 Body, 3 - 7 - 2 Front Forehead, 3 - 7 - 3 Tower Barrel Hole, 3 - 7 - 4 High - Voltage Chamber Hole, 3 - 7 - 5 First Exhaust Hole, 3 - 7 - 6 Second Exhaust Hole, 3 - 7 - 7 Meteorological Shelf, 3 - 7 - 8 Elastic Support of the Machine Cabin Cover;

[0063] 4 High - Voltage Chamber: 4 - 1 Hanging Frame and Outer Shell, 4 - 2 Transformer, 4 - 3 Inverter, 4 - 4 First Cable, 4 - 5 Second Cable, 4 - 6 Third Cable, 4 - 7 Partition Board, 4 - 8 Inlet Fan, 4 - 9 Exhaust Fan, 4 - 10 Straight Ladder, 4 - 11 Lifting Lug, 4 - 12 Winch. Detailed Embodiment

[0064] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0065] The following will detail the technical solutions provided by the embodiments of the present invention in conjunction with the drawings.

[0066] An embodiment of the present invention provides a wind power generating set, mainly including a tower barrel 1, a wind turbine 2, a machine cabin 3, and a high - voltage chamber 4. The machine cabin 3 is connected to the tower barrel 1 through a yaw system 3 - 3, the machine cabin 3 is connected to the wind turbine 2 through a main shaft 3 - 1 - 1, and the machine cabin 3 is connected to the high - voltage chamber 4 through a rear frame assembly 3 - 6.

[0067] The wind turbine rotor 2 includes blades 2-1, a hub assembly 2-2, a nacelle cover 2-3, and a combined ladder 2-4. The hub assembly 2-2 is provided with a hub manhole 2-2-1 on the arc surface near the nacelle side, serving as a personnel passage between the nacelle 3 and the hub. A total of three manholes are arranged on the three arc surfaces. Inside the hub, at the positions connecting to the three manholes, a combined ladder 2-4 is arranged. The combined ladder 2-4 is composed of three first flexible ladders 2-4-1, three second flexible ladders 2-4-2, and one hexagonal rigid ladder 2-4-3. The first flexible ladders 2-4-1 are respectively connected to the arc surface connection points 2-2-2 and the hexagonal rigid ladder 2-4-3, and the second flexible ladders 2-4-2 are respectively connected to the flange connection points 2-2-3 and the hexagonal rigid ladder 2-4-3. When maintaining the internal equipment of the hub of the wind turbine generator, the wind turbine rotor 2 is stationary in a "Y" shape. Personnel enter the nacelle cover 2-3 from the nacelle 3, and then enter the hub interior through the opening at the front of the hub. The space inside the nacelle cover 2-3 is narrow and the passage is long, making it inconvenient for personnel to pass. After adopting this combined ladder 2-4, personnel enter the nacelle cover 2-3 from the nacelle 3 through the front forehead 3-7-2 of the nacelle cover 3-7, and then enter the hub interior through the hub manhole 2-2-1, climb down the combined ladder 2-4 to reach the hub flange surface. The personnel passage is short, the passage is convenient, and the safety is better. The structure of the combination of the flexible ladder and the hexagonal rigid ladder 2-4-3 is also convenient for installation. Specifically, reference can be made to Figure 1 , 2 , 3, 4, 5, and 20 as shown.

[0068] The main drive system 3-1 includes a main shaft 3-1-1, a front bearing 3-1-2, a front bushing 3-1-3, a front end cover 3-1-4, a monitoring device 3-1-5, a bearing housing 3-1-6, a rear bearing 3-1-7, a rear end cover 3-1-8, a rear bushing 3-1-9, a compression ring 3-1-10, an elastic support for the speed increaser 3-1-11, a speed increaser 3-1-12, a coupling 3-1-13, a brake 3-1-14, a generator 3-1-15, a first backing plate 3-1-16, a second backing plate 3-1-17, a third backing plate 3-1-18, and a fourth backing plate 3-1-19. The front bearing 3-1-2, the front bushing 3-1-3, the front end cover 3-1-4, and the monitoring device 3-1-5 are connected to the front bearing hole 3-1-6-2 of the main shaft 3-1-1 and the bearing housing 3-1-6. The rear bearing 3-1-7, the rear end cover 3-1-8, the rear bushing 3-1-9, and the compression ring 3-1-10 are connected to the rear bearing 3-1-7 hole of the main shaft 3-1-1 and the bearing housing 3-1-6. The bearing housing 3-1-6 is connected to the main frame 3-2. The elastic support 3-1-11 for the speed increaser is respectively connected to the speed increaser 3-1-12 and the main frame 3-2. The coupling 3-1-13 is respectively connected to the speed increaser 3-1-12 and the generator 3-1-15. The brake 3-1-14 is connected to the coupling 3-1-13. The generator 3-1-15 is connected to the rear frame 3-6-1 through a bracket. An axial preload is applied to the bearings of the main drive system 3-1 through the compression ring 3-1-10 to improve its load-bearing capacity and rigidity. After the bearings are preloaded, axial deformation occurs, and the deformation amount is proportional to the preload force. The monitoring device 3-1-5 determines the bearing preload degree by detecting the change in the distance between the bearing race and the sensor, and adjusts the compression amount of the compression ring 3-1-10 on the bearings when necessary to keep the bearings in a better load-bearing state. Clamping bosses 3-1-1-1 are symmetrically arranged on the inner side of the large end of the main shaft 3-1-1 to facilitate the positioning and clamping during the machining of the main shaft 3-1-1. The bell mouth near the flange of the main shaft is a part with severe loading, and the outer contour arc surface 3-1-1-3 is composed of multiple curves. The inner cavity arc surface 3-1-1-2 is also composed of multiple curves. In the low-load-bearing part between the bearings, a smaller wall thickness is adopted. The areas of the main shaft 3-1-1 near the bearing race, the front bushing 3-1-3, and the rear bushing 3-1-9 edges are stress concentration parts, and the first group of relief grooves 3-1-1-4 and the second group of relief grooves 3-1-1-5 composed of multiple arcs are respectively set. The circumferential surface and the end surface of the small end of the main shaft 3-1-1 are respectively connected to the rear bearing 3-1-7, the rear bushing 3-1-9, the compression ring 3-1-10, and the speed increaser 3-1-12, and two circles of large-size bolt holes are arranged, which are prone to stress concentration. Therefore, a step 3-1-1-6 is set at the small end of the main shaft 3-1-1 to stagger multiple load-bearing parts. Oil holes 3-1-1-7 are set at the installation positions of the front bearing 3-1-2 and the rear bearing 3-1-7 of the main shaft 3-1-1 to facilitate the disassembly of the bearings.The bearing housing 3-1-6 is provided with a frame mounting hole 3-1-6-1 for connection with the main frame 3-2. The front bearing hole 3-1-6-2 and the rear bearing hole 3-1-6-3 are respectively connected with the front bearing 3-1-2 and the rear bearing 3-1-7. The locking pin hole 3-1-6-4 is connected with the locking pin 3-4-2. The observation hole 3-1-6-5 is used to collect the waste grease of the main bearing and reduce the weight of the bearing housing 3-1-6. For details, please refer to... Figure 2 , 3 , 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20.

[0069] When the wind turbine is equipped with blades 2-1 of different specifications or applied to different wind farms, there may be a problem of too small clearance between the blade 2-1 and the tower barrel 1. By adopting the present invention, the elevation angle of the wind turbine can be increased at a lower cost so as to increase the clearance distance. Figure 6 As shown, the elevation angle is A, Figure 7 As shown, the elevation angle is B, and B > A. Since the contact surface between the torque arm 3-1-12-2 of the speed increaser and the elastic support 3-1-11 of the speed increaser is an arc, when the elevation angle increases, the main drive system 3-1 can rotate around the center of the elastic support 3-1-11 of the speed increaser. At this time, a wedge-shaped gap is formed between the bottom plane of the bearing housing 3-1-6 and the first cover plate 3-2-1 of the main frame 3-2, and the distance between the generator 3-1-15 and the rear frame 3-6-1 decreases. Therefore, wedge-shaped first shim 3-1-16, second shim 3-1-17, third shim 3-1-18, and fourth shim 3-1-19 are added between the bearing housing 3-1-6 and the main frame 3-2 to form a connection plane, and then they are connected by bolts. Since the diameter of the frame mounting hole 3-1-6-1 of the bearing housing 3-1-6 is large, even if the axis of the bolt is not concentric with the axis of the frame mounting hole 3-1-6-1, it can be installed smoothly. The front bracket and the rear bracket for supporting the generator 3-1-15 are bolted to the rear frame 3-6-1, and brackets with corresponding heights can be configured according to different elevation angles, Figure 6 The first front bracket 3-6-5 and the first rear bracket 3-6-6 are used in the... state, Figure 7 The second front bracket 3-6-8 and the second rear bracket 3-6-9 are used in the... state.

[0070] The main frame 3-2 includes a first cover plate 3-2-1, a lower cover plate 3-2-2, a web plate 3-2-3, a second cover plate 3-2-4, a third cover plate 3-2-5, a flange plate 3-2-6, a plug plate 3-2-7, a lower cover plate of the support leg 3-2-8, and an adjustment seat 3-2-9. The main frame 3-2 generally presents a combined complex curved surface box girder structure, giving full play to the advantages of large load-bearing and material saving of the box girder structure. The first mounting hole 3-2-1-1 of the first cover plate 3-2-1 is connected to the bearing seat 3-1-6, the second mounting hole 3-2-1-2 is connected to the torque arm 3-1-12-2 of the speed increaser, the third mounting hole 3-2-1-3 is connected to the front engine room lifting point 3-5-4 of the front frame assembly 3-5, and the fourth mounting hole 3-2-1-4 is connected to the column 3-5-2 of the front frame assembly 3-5. The part of the first cover plate 3-2-1 where the second mounting hole 3-2-1-2 and the fourth mounting hole 3-2-1-4 are located is locally sunken. The bearing mounting hole 3-2-2-1 and the brake mounting hole 3-2-2-2 of the lower cover plate 3-2-2 are respectively connected to the yaw bearing 3-3-1 and the yaw brake 3-3-3. The web plate 3-2-3 is provided with an engine room manhole 3-2-3-1 as the personnel passage between the engine room 3 and the tower barrel 1, and the side cable outlet hole 3-2-3-2 is used for cable layout and also plays a role in weight reduction. The middle front part of the first cover plate 3-2-1, the lower cover plate 3-2-2, the web plate 3-2-3, and the second cover plate 3-2-4 together form a concave approximate annular box girder structure, which can accommodate the bearing seat 3-1-6 and is also the main load-bearing part of the engine room 3. The flange plate 3-2-6 is provided with a yaw drive mounting hole 3-2-6-1 and an elastic support mounting hole 3-2-6-2 for the engine room cover. The first cable hole 3-2-7-1 of the plug plate 3-2-7 is used for laying the cable from the high-voltage chamber 4 to the bottom of the tower barrel 1, and the adjustment seat mounting hole 3-2-7-2 is used for installing the adjustment seat 3-2-9. The lower cover plate of the support leg 3-2-8 is provided with a second cable hole 3-2-8-1, which also plays a role in weight reduction. The rear part of the first cover plate 3-2-1, the third cover plate 3-2-5, the plug plate 3-2-7, and the lower cover plate of the support leg 3-2-8 together form two open box girder support legs, with the speed increaser 3-1-12 accommodated in the middle. The first cover plate 3-2-1 is connected to the torque arm 3-1-12-2 of the speed increaser and the column 3-5-2 of the front frame assembly 3-5, and the plug plate 3-2-7 is connected to the rear frame 3-6-1 through the adjustment seat 3-2-9. The adjustment seat 3-2-9 includes a first pin shaft seat 3-2-9-1, an adjustment pad 3-2-9-2, and an adjusting bolt 3-2-9-3. The first pin shaft seat 3-2-9-1 and the adjustment pad 3-2-9-2 are connected to the fourth pin shaft seat 3-6-3 and the second pin shaft 3-6-11 of the rear frame 3-6-1. For details, please refer to Figure 2 , 3 , 6, 7, 14, 15, 16, 17, 18, 19, 20.

[0071] For convenient transportation, it is necessary to minimize the height of the engine room 3. Therefore, the main frame 3-2 adopts a box girder structure with a composite curved surface. The second cover plate 3-2-4 on the inner side of the middle part and the third cover plate 3-2-5 on the inner side of the rear part are concave-shaped to accommodate the bearing seat 3-1-6 and the speed increaser 3-1-12 of the main drive system 3-1, thereby reducing the overall height. The center of the speed increaser torque arm 3-1-12-2 is no longer concentric with the box axis 3-1-12-1, but is inclined downward. The first cover plate 3-2-1 and the leg lower cover plate 3-2-8 connecting the main frame 3-2 and the speed increaser torque arm 3-1-12-2 both adopt a sunken design, causing the rear part of the main frame 3-2 to sink as a whole, which is convenient for reducing the installation height of the generator 3-1-15. This also reduces the weight of the frame. For details, please refer to Figure 2 , 3 , 6, 7, 13, 14, 15, 17, 18, 19, 20.

[0072] The wind turbine locking device 3-4 mainly includes a wind turbine locking disk 3-4-1 and a locking pin 3-4-2. The wind turbine locking disk 3-4-1 is connected to the main shaft 3-1-1, and the locking pin 3-4-2 is installed in the locking pin hole 3-1-6-4 of the bearing seat 3-1-6. The bearing seat 3-1-6 is connected to the main frame 3-2. The locking pin 3-4-2 can be extended or retracted by means of a hydraulic station or manually pumping hydraulic oil, or it can also be extended or retracted by a screw method. When the locking pin 3-4-2 extends, it cooperates with the wind turbine locking disk 3-4-1 to make the wind turbine 2 stationary. In this example, two locking pins 3-4-2 are provided. For details, please refer to Figure 2 , 3 , 6, 7, 11, 12.

[0073] The front frame assembly 3-5, the rear frame assembly 3-6 and the main frame 3-2 together form a truss structure, achieving high load-bearing capacity with a relatively small structural weight through this spatial configuration. The front frame assembly 3-5 is connected to the first cover plate 3-2-1 of the main frame 3-2 through the front nacelle lifting point 3-5-4 and the column 3-5-2, and is hinged to the upper part of the rear frame 3-6-1 through the second pin seat 3-5-3, the third pin seat 3-6-2 and the first pin 3-6-10. The upper part of the rear frame assembly 3-6 is hinged to the front frame assembly 3-5, and the lower part of the rear frame assembly 3-6 is hinged to the plug plate 3-2-7 on the main frame 3-2 through the first pin seat 3-2-9-1, the fourth pin seat 3-6-3 and the second pin 3-6-11. If it is found that the downward deflection of the rear frame 3-6-1 is too large, the adjustment seat 3-2-9 on the plug plate 3-2-7 can be loosened first, and then the adjusting bolt 3-2-9-3 is rotated to make the rear frame 3-6-1 rotate upward around the first pin 3-6-10 to an appropriate position. At this time, an adjusting pad 3-2-9-2 with an appropriate thickness is filled in the gap between the adjustment seat 3-2-9 and the plug plate 3-2-7, and the adjustment seat 3-2-9 and the plug plate 3-2-7 are reconnected to complete the downward deflection correction. The rear nacelle lifting point 3-6-12 and the hanging point 3-6-4 for hanging the high-voltage chamber 4 are arranged at the lower part of the rear frame 3-6-1. The front bracket and rear bracket for supporting the generator 3-1-15 are also arranged on the rear frame 3-6-1, and brackets with corresponding heights can be configured according to different elevation angles of the wind turbine to adapt to the main drive system 3-1. A relatively large maintenance space is reserved on the upper and lower surfaces at the front part of the rear frame 3-6-1. In order to make up for the overall rigidity, adjustable cables 3-6-7 are used to tension the steel structures on both sides, which not only improves the rigidity but also achieves the lightweight of the frame. For details, please refer to Figure 2 、 3 、6、7、14、16、20、21。

[0074] The nacelle cover 3-7 includes the body 3-7-1, the front forehead 3-7-2, the tower barrel hole 3-7-3, the high-voltage chamber hole 3-7-4, the first exhaust hole 3-7-5, the second exhaust hole 3-7-6, the meteorological rack 3-7-7, and the nacelle cover elastic support 3-7-8. The front forehead 3-7-2 bulges at the connection part between the nacelle cover 3-7 and the hub cover 2-3, providing a personnel passage between the nacelle 3 and the hub, and also facilitating the smooth passage of air flow through the top of the nacelle cover 3-7. The tower barrel hole 3-7-3 envelopes the top of the tower barrel 1, making the connection part between the nacelle 3 and the tower barrel 1 as airtight as possible. The high-voltage chamber hole 3-7-4 envelopes the upper part of the high-voltage chamber 4 to prevent the high-voltage chamber 4 from being rained on. The first exhaust hole 3-7-5 and the second exhaust hole 3-7-6 discharge the hot air in the nacelle 3. The nacelle cover 3-7 is connected to the front frame assembly 3-5, the rear frame assembly 3-6 and the main frame 3-2 through the nacelle cover elastic support 3-7-8. For details, please refer to Figure 1 、 2 、3、20、21。

[0075] The high-voltage chamber 4 includes a suspension bracket and a housing 4-1. The current converter 4-3 and the transformer 4-2 are centrally arranged in the enclosed high-voltage chamber 4. The high-voltage chamber 4 is suspended below the rear frame 3-6-1 and its upper part enters the interior of the nacelle cover 3-7 for waterproofing. The high-voltage chamber 4 is close to the tower barrel 1 to minimize the downward deflection deformation of the rear frame 3-6-1 and the nacelle 3. The generator 3-1-15 is connected to the current converter 4-3 and the transformer 4-2 through cables. The transformer 4-2 is connected to the wind farm substation or the power grid through cables. The electric energy output by the generator 3-1-15 is boosted by the current converter 4-3 and the transformer 4-2 and then transmitted to the tower bottom, which can significantly reduce the number of power cables and the cost of the wind turbine. Personnel can enter the high-voltage chamber 4 from the nacelle 3 through the straight ladder 4-10. The transformer 4-2 and the current converter 4-3 are separated by a partition 4-7 to reduce the high-voltage risk. The lower part of the high-voltage chamber 4 is equipped with an intake fan 4-8 to introduce outside cold air to cool the current converter 4-3, the transformer 4-2, the generator 3-1-15 and the speed increaser 3-1-12 in the nacelle 3. An exhaust fan 4-9 is arranged on the side of the high-voltage chamber 4 close to the transformer 4-2 to exhaust the hot air of the transformer 4-2 nearby. The current converter 4-3 directly discharges its own hot air from the high-voltage chamber 4 through its own exhaust port. When installing the wind turbine, the nacelle 3 can be installed first according to the conventional process, and then the high-voltage chamber 4 is lifted from the ground to the predetermined position by a winch 4-12 arranged in the nacelle 3, and then the lifting lugs 4-11 of the high-voltage chamber 4 are connected to the hanging points 3-6-4 of the rear frame 3-6-1. For details, please refer to Figure 1 、 2 、21、22.

[0076] In summary, the wind turbine provided by the embodiment of the present invention is light in overall weight, small in size and low in cost, and can increase the elevation angle and the clearance of the blade 2-1, which is convenient for production organization and transportation.

[0077] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. In addition, "front", "rear", "left", "right", "upper" and "lower" in this article are referred to the placement state shown in the drawings.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A wind turbine generator set, characterized in that, it comprises: a tower barrel, a wind wheel, a nacelle and a high-voltage chamber; The nacelle comprises: a main frame, a front frame assembly, a rear frame assembly and a main drive system; the main drive system comprises: a main shaft, a bearing seat, a speed increaser, a coupling and a generator; the bearing seat is arranged at the front part of the main frame, the speed increaser is installed at the rear part of the main frame through an elastic support, the main shaft passes through the bearing seat and is connected with the front end of the speed increaser, the rear end of the speed increaser is connected with the front end of the coupling, the rear end of the coupling is connected with the generator, and the generator is arranged in the rear frame assembly; the front frame assembly is arranged on the main frame, and the upper part of the front end of the rear frame assembly is hinged with the tail of the front frame assembly, and the lower part of the front end of the rear frame assembly is detachably hinged with the tail of the main frame for completing downward deflection correction; a detachable backing plate is arranged between the bearing seat and the main frame for adjusting the elevation angle of the bearing seat; height-adjustable front brackets and rear brackets are arranged between the generator and the rear frame assembly for adjusting the angle of the generator; The nacelle is connected with the tower barrel through a yaw system, the wind wheel is connected with the main shaft, and the high-voltage chamber is connected to the lower part of the rear frame assembly; The wind wheel comprises blades, a hub assembly, a hub cover and a combined ladder. There are three manholes arranged on the hub assembly. The combined ladder comprises 3 first flexible ladders, 3 second flexible ladders and a hexagonal rigid ladder. Each first flexible ladder is respectively connected with an arc surface connection point and a side of the hexagonal rigid ladder, and each second flexible ladder is respectively connected with a flange connection point and a side of the hexagonal rigid ladder. The first flexible ladders and the second flexible ladders are distributed at intervals; The nacelle further comprises a nacelle cover, and the nacelle cover comprises a body, a front forehead, a tower barrel hole, a high-voltage chamber hole, a first exhaust hole, a second exhaust hole, a meteorological rack and a nacelle cover elastic support; the front forehead bulges at the part connecting with the hub cover to provide a personnel passage; the tower barrel hole envelopes the top of the tower barrel to make the connection part between the nacelle and the tower barrel as airtight as possible; the high-voltage chamber hole envelopes the upper part of the high-voltage chamber to prevent the high-voltage chamber from being rained on; the first exhaust hole and the second exhaust hole are used for exhausting the hot air in the nacelle, and the nacelle cover is connected with the front frame assembly, the rear frame assembly and the main frame through the nacelle cover elastic support; The high-voltage chamber is suspended below the rear frame assembly, and the upper part is located inside the nacelle cover. The high-voltage chamber is close to the tower barrel to minimize the downward deflection deformation of the rear frame and the nacelle; an inverter and a transformer are arranged in the high-voltage chamber. The generator is connected with the inverter and the transformer through cables. The transformer is connected with a wind farm substation or the power grid through cables. The electric energy output by the generator is transmitted to the tower bottom after being stepped up by the inverter and the transformer.

2. The wind turbine generator set according to claim 1, characterized in that, A front bearing sleeved on the main shaft is provided at the front bearing hole of the bearing housing. A front shaft sleeve, a front end cover and a monitoring device are provided at the front bearing. A rear bearing sleeved on the main shaft is provided at the rear bearing hole of the bearing housing. A rear end cover, a rear shaft sleeve and a compression ring are provided at the rear bearing. The compression ring is used to apply an axial pre-tightening force to the bearing and its compression amount is adjustable. The monitoring device is used to detect the pre-tightening degree of the bearing.

3. The wind power generating set according to claim 2, wherein, Clamping bosses are symmetrically arranged inside the large end of the main shaft, which is convenient for positioning and clamping during the machining of the main shaft; The outer arc surface of the part of the main shaft close to the flange is composed of multiple curves, and the inner cavity arc surface is also composed of multiple curves; In the regions of the main shaft close to the edges of the bearing race, the front shaft sleeve and the rear shaft sleeve, a first group of unloading grooves and a second group of unloading grooves composed of multiple arcs are respectively arranged; A step is provided at the small end of the main shaft so that multiple load-bearing parts are staggered from each other.

4. The wind power generating set according to claim 3, wherein, The main frame is a combined curved surface box girder structure, which includes a first cover plate, a lower cover plate, a web plate, a second cover plate, a third cover plate, a flange plate, a plug plate, a lower cover plate of the support leg and an adjustment seat; the first mounting hole of the first cover plate is connected to the bearing housing, the second mounting hole is connected to the torque arm of the speed increaser, the third mounting hole is connected to the front nacelle lifting point of the front frame assembly, and the fourth mounting hole is connected to the column of the front frame assembly. A part of the first cover plate where the second mounting hole and the fourth mounting hole are located sinks locally; the bearing mounting hole and the brake mounting hole of the lower cover plate are respectively connected to the yaw bearing and the yaw brake of the yaw system; the web plate is provided with a nacelle manhole, which serves as a personnel passage between the nacelle and the tower barrel. The web plate is provided with side wire outlet holes for cable layout and plays a role in weight reduction; The middle front part of the first cover plate, the lower cover plate, the web plate and the second cover plate together form a downward concave approximate annular box girder structure for accommodating the bearing housing; the flange plate is provided with a yaw drive mounting hole and a nacelle cover elastic support mounting hole; the plug plate is provided with a first cable hole for arranging the cable from the high-voltage chamber to the bottom of the tower barrel, and the plug plate is provided with an adjustment seat mounting hole for installing the adjustment seat; the lower cover plate of the support leg is provided with a second cable hole; the rear part of the first cover plate, the third cover plate, the plug plate and the lower cover plate of the support leg together form two open box girder legs for accommodating the speed increaser. The first cover plate is connected to the torque arm of the speed increaser and the column of the front frame assembly. The plug plate is connected to the rear frame assembly through the adjustment seat; the adjustment seat includes a first pin shaft seat, an adjustment pad and an adjustment bolt. The first pin shaft seat and the adjustment pad are connected to the fourth pin shaft seat and the second pin of the rear frame assembly.

5. The wind power generating set according to claim 4, wherein, The nacelle further includes a wind turbine locking device, which includes a wind turbine locking disc and a locking pin. The wind turbine locking disc is arranged on the main shaft, and the locking pin is telescopically arranged in the locking pin hole of the bearing seat and is used to insert into the wind turbine locking disc when extended to make the wind turbine stationary.

6. The wind power generating set according to claim 5, characterized in that the front frame assembly, the rear frame assembly and the main frame jointly form a truss structure. The front frame assembly is connected to the first cover plate of the main frame through the front nacelle lifting point and the column, and is hinged to the upper part of the front end of the rear frame assembly through the second pin seat, the third pin seat and the first pin; the lower part of the front end of the rear frame assembly is hinged to the plug plate on the main frame through the first pin seat, the fourth pin seat and the second pin.

7. The wind power generating set according to claim 6, characterized in that a partition is provided between the transformer and the converter to reduce the risk of high-voltage electricity; an intake fan is provided at the lower part of the high-voltage chamber to introduce external cold air to cool the converter, the transformer, the generator and the speed increaser in the nacelle; an exhaust fan is arranged on the side of the high-voltage chamber close to the transformer to directly exhaust the hot air of the transformer nearby; the converter directly discharges its own hot air out of the high-voltage chamber through its own exhaust port.

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