CN113803216B

CN113803216B - Wind generating set

Info

Publication number: CN113803216B
Application number: CN202111265994.6A
Authority: CN
Inventors: 黄永平
Original assignee: CSIC Haizhuang Windpower Co Ltd
Current assignee: CSIC Haizhuang Windpower Co Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2023-06-06
Anticipated expiration: 2041-10-28
Also published as: CN113803216A

Abstract

The invention discloses a wind generating set, which comprises a tower, a cabin, a transmission chain system and a wind wheel, wherein the cabin is arranged at the top end of the tower, the transmission chain system is arranged on a frame in the cabin, the wind wheel is connected with the transmission chain system, and the transmission chain system comprises a reduction gearbox and a generator. The reduction gearbox comprises a box body, an input shaft, an input gear pair and a parallel gear pair and an output shaft. The input shaft is rotatably arranged in the box body and is connected with the hub of the wind wheel. The input gear pair comprises a first driving wheel and a first driven wheel, the first driving wheel is arranged on the input shaft, and a plurality of first driven wheels are meshed with the first driving wheel. The parallel stage gear pair is arranged in the box body and is in transmission connection with the first driven wheel, the output shaft is in transmission connection with the parallel stage gear pair, and the output shaft is connected with the generator. The wind generating set simplifies the transmission chain structure of the set, greatly reduces the cost of the set, simplifies the installation and debugging of the set and improves the reliability of the set.

Description

Wind generating set

Technical Field

The invention relates to the technical field of wind power generation, in particular to a wind generating set.

Background

With the market price of wind power reduced, wind turbine manufacturers are required to continuously reduce the manufacturing cost of the whole machine, and higher requirements are provided for the performance of the wind turbine. In the wind turbine generator system, a transmission chain is used as a key system for transmitting power, and is particularly key because of bearing huge work load, and the structural characteristics of the transmission chain directly determine the cost and performance of the wind turbine generator system.

The traditional wind turbine generator comprises a wind wheel system, a transmission chain system, an electric system, a yaw system, a pitch system, a cooling system, a control system, a cabin system, a tower system and the like. The transmission chain system comprises a hub, a main shaft bearing, a bearing seat, a gear box, a generator, a coupler and other parts, wherein the main shaft, the main shaft bearing and the bearing seat jointly form a main shaft part.

The transmission chain system of the wind turbine generator is one of the most critical systems. In the transmission chain, a wind wheel hub is directly arranged at one end of a main shaft, and one group or two groups of bearings are arranged on the main shaft for supporting and are connected with a frame through bearing seats. The other end of the main shaft is connected with the input end of a gear box through an input coupling, the gear box is usually of a multi-stage planetary speed increasing structure, and an output shaft of the gear box is connected with a generator through an output coupling.

When the wind turbine works, various loads such as wind wheel thrust, gravity, transverse load and torque transmitted from the hub end are transmitted to the main shaft and act on the main shaft component, and the main shaft transmits the wind wheel thrust, gravity and transverse load to the frame through the main shaft bearing and the bearing seat and transmits the torque to the gear box. The gearbox is used for accelerating the low-rotation-speed large torque transmitted by the main shaft to high-speed small torque and transmitting the high-speed large torque to the generator so as to meet the working requirement of the generator.

The existing traditional wind generating set has the following defects: 1. the independent main shaft component exists in the transmission chain, and wind wheel thrust, gravity, transverse load and torque from the hub are transmitted to the frame and the gear box through the main shaft component, so that the unit has a complex structure and is difficult to install and debug. 2. The main shaft, main shaft bearing and bearing seat of the main shaft component in the transmission chain are required to bear all the load transferred by the hub end, so that the size and the weight are large, and the weight and the cost of the unit are increased. 3. In order to accommodate and mount the spindle units, the machine frame of the machine set needs to be lengthened in axial dimension, thereby increasing the weight and cost of the machine set. 4. The main shaft bearing in the transmission chain needs to bear all the thrust and gravity of the wind wheel, balance transverse load, have complex stress, large bearing size, difficult installation and adjustment, high price and easy damage.

Disclosure of Invention

Based on the problems, the conventional wind turbine generator system has a long transmission chain, a large number of parts, a large weight, difficult installation and debugging and high cost.

The utility model provides a wind generating set, includes tower section of thick bamboo, cabin, drive train system and wind wheel, the cabin install in the top of tower section of thick bamboo, drive train system install in the frame in the cabin, the wind wheel with drive train system connects, drive train system includes reducing gear box and generator, the reducing gear box includes:

the box body is arranged on the rack;

the input shaft is rotatably arranged in the box body and extends out of the box body to be connected with the hub of the wind wheel;

the input gear pair comprises a first driving wheel and a first driven wheel, the first driving wheel is arranged at the end part of the input shaft, which is positioned in the box body, the first driven wheel is arranged in the box body, a plurality of first driven wheels are distributed around the first driving wheel and meshed with the first driving wheel, and the first driving wheel and the first driven wheel are bevel gears;

the parallel stage gear pair is arranged in the box body and is in transmission connection with the first driven wheel, and the parallel stage gear pair is used for realizing speed-increasing transmission; a kind of electronic device with high-pressure air-conditioning system

The output shaft is arranged in the box body, the output shaft is in transmission connection with the parallel gear pair, and the output shaft extends out of the box body to be connected with the generator.

In one embodiment, support bearings are mounted on the input shaft at intervals, and the support bearings are mounted in the box body.

In one embodiment, the input gear pair further comprises a first parallel shaft rotatably mounted in the housing, the first driven wheel is mounted at one end of the first parallel shaft, and the other end of the first parallel shaft is connected with the parallel stage gear pair.

In one embodiment, the first parallel shaft is provided with a first bearing, the first bearing is mounted on the box body, and the first bearing on one side of the first driven wheel, which is far away from the input shaft, is a thrust bearing.

In one embodiment, the parallel stage gear pair has a plurality of stages, and the parallel stage gear pair gradually reduces the split number in the transmission path by the power converging.

In one embodiment, the parallel stage gear pair includes a second driving wheel, a second driven wheel, a second parallel shaft, a third driving wheel and a third driven wheel, wherein the second driving wheel is installed at the other end of the first parallel shaft, the second parallel shaft is rotatably installed in the box body, the second driven wheel is installed at one end of the second parallel shaft, the second driven wheel is meshed with at least one second driving wheel, the third driving wheel is installed at the other end of the second parallel shaft, the third driven wheel is installed on the output shaft, and the third driven wheel is meshed with a plurality of third driving wheels.

In one embodiment, the first driven wheel is integrally formed on the first parallel shaft, and the second driven wheel is integrally formed on the second parallel shaft.

In one embodiment, the number of the second driving wheels is a multiple of the number of the second driven wheels, the second driven wheels are located in an area surrounded by the second driving wheels, and each second driven wheel is meshed with a plurality of the second driving wheels.

In one embodiment, a connecting shaft is arranged in the output shaft in a penetrating way, the third driven wheel is integrally formed on the connecting shaft, and the connecting shaft is flexibly connected with the output shaft.

In one embodiment, the wind turbine generator system further comprises an electrical system, a yaw system, a pitch system, a cooling system and a control system, wherein the electrical system is used for processing electric energy generated by a generator set generator and then accessing the electric network, the yaw system is connected with the tower and the engine room and used for deflecting the wind wheel, the pitch system is installed in the hub and used for adjusting the pitch angle of the wind wheel blades, the cooling system is used for cooling and protecting gears, bearings and electrical components in a transmission chain, and the control system is used for monitoring the running state of the generator set and controlling the running of the generator set.

The wind generating set has at least the following advantages:

1. the transmission chain system in the unit eliminates a separate main shaft component, comprising a main shaft, a main shaft supporting bearing and a bearing seat structure. The transmission chain structure of the unit is greatly simplified, the cost of the unit is greatly reduced, the installation and debugging of the unit are simplified, and the reliability of the unit is improved.

2. The unit transmission chain system omits an input coupling, and the hub is directly and rigidly connected with the input shaft of the gear box. The transmission chain structure of the unit is simplified, the installation difficulty of the unit is reduced, and the cost of the unit is also reduced.

3. Because the main shaft component and the input coupling are omitted in the transmission chain system, the length of the transmission chain is greatly shortened, the length of the frame is correspondingly greatly shortened, the weight is greatly reduced, and the unit cost is reduced.

4. Because the main shaft component and the input coupling are omitted, and meanwhile, the frame is designed to be light, the weight of the engine room is greatly reduced, the hoisting requirement of the unit is reduced, and the hoisting cost of the unit is reduced.

5. The gear box in the unit transmission chain system adopts a multi-split parallel transmission structure to accelerate, and the meshing axial force of the input gear pair can generate good counteracting effect on the thrust of the wind wheel, thereby greatly reducing the load of the input shaft support bearing for bearing the function of the main shaft support bearing. Therefore, the difficulty in selecting the input shaft supporting bearing and the installation and debugging requirements are reduced; further improving the reliability of the unit and reducing the cost of the unit.

6. The gear box in the unit transmission chain system adopts a multi-split parallel transmission structure design, and the multi-split gear transmission structure is distributed around the input shaft bearing the main shaft function in parallel, so that radial space arrangement is fully utilized. The first driven wheels can uniformly split the meshing axial force of the primary gear pair into a plurality of stress points, so that the stress of a single position is reduced, and the force uniformly acts on the outer side of the box body. Therefore, the stress of the box body is improved, the difficulty of the structural design of the box body is reduced, the design of the light box body is facilitated, and the unit cost is reduced.

7. Because the length of the transmission chain system in the unit is greatly shortened, the dynamic characteristics of the transmission chain system are obviously improved, the reduction of the resonance frequency of the system is restrained, the risk that the resonance frequency falls into a working interval is reduced, the design difficulty of the unit is reduced, and the reliability of the unit is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. Throughout the drawings, the elements or portions are not necessarily drawn to actual scale.

FIG. 1 is a schematic diagram of a drive train system in a wind turbine generator system according to one embodiment;

FIG. 2 is a cross-sectional view of the gearbox of FIG. 1;

FIG. 3 is a cross-sectional view of the gearbox of FIG. 1 from another perspective;

FIG. 4 is a front view of the gearbox of FIG. 1;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4;

fig. 7 is a cross-sectional view taken along line C-C of fig. 4.

Reference numerals:

10-hub, 20-gear box, 21-box, 211-front end cover, 212-first shell, 213-second shell, 214-third shell, 215-rear end cover, 22-input shaft, 221-support bearing, 222-connecting flange, 223-connecting boss, 23-input gear pair, 231-first driving wheel, 232-first driven wheel, 233-first parallel shaft, 234-first bearing, 24-parallel gear pair, 241-second driving wheel, 242-second driven wheel, 243-second parallel shaft, 244-third driving wheel, 245-third driven wheel, 246-connecting sleeve, 25-output shaft, 26-connecting shaft, 27-rubber joint, 30-generator, 40-frame.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1, a wind generating set in an embodiment includes a tower, a nacelle, a driving chain system, and a wind wheel. The bottom of the tower cylinder is fixed on the ground through a reinforced concrete foundation structure, and the engine room is arranged at the top of the tower cylinder. The drive train system is mounted on a frame 40 in the nacelle, with the wind wheel being connected to the drive train system. In one embodiment, the drive train system includes a reduction gearbox 20 and a generator 30, the reduction gearbox 20 and the generator 30 are mounted on a frame 40, and the reduction gearbox 20 is connected with the hub 10 of the wind wheel and the generator 30, so as to speed up the low rotation speed and the large torque of the hub 10 to the high speed and the small torque, and then transmit the low rotation speed and the large torque to the generator 30.

Referring to fig. 2, in one embodiment, the gear box 20 includes a box 21, an input shaft 22, an input gear pair 23, a parallel stage gear pair 24, and an output shaft 25. The case 21 is mounted on the frame 40, and the case 21 is used for accommodating other components of the gear case 20. The input shaft 22 is rotatably mounted in the housing 21, and the input shaft 22 extends out of the housing 21 to connect with the hub 10 of the wind wheel.

Specifically, the input shaft 22 is provided with support bearings 221 at intervals, and the support bearings 221 are mounted on the housing 21, so that the input shaft 22 is rotatably mounted in the housing 21. One end of the input shaft 22 is gradually increased in diameter in a direction away from the case 21 and is formed with a connection flange 222, and the connection flange 222 is rigidly connected with the hub 10 by bolts, thereby realizing connection of the input shaft 22 and the hub 10.

Referring to fig. 3, the input gear pair 23 includes a first driving wheel 231 and a first driven wheel 232, the first driving wheel 231 is located in the case 21, the first driving wheel 231 is installed in the middle of the input shaft 22, the first driven wheel 232 is installed in the case 21, a plurality of first driven wheels 232 are distributed around the first driving wheel 231 and meshed with the first driving wheel 231, and the first driving wheel 231 and the first driven wheel 232 are both helical gears. Specifically, the input shaft 22 is provided with a connection boss 223, and the first driving wheel 231 is mounted on the connection boss 223 through a bolt, so that the first driving wheel 231 is mounted on the input shaft 22.

Referring to fig. 4 and 5 together, in one embodiment, the number of the first driven wheels 232 is at least two, and preferably an even number. In particular, in the present embodiment, the number of the first driven wheels 232 is 8. The first driven wheels 232 may be evenly distributed around the input shaft 22 or unevenly distributed as desired. In this embodiment, the first driven wheels 232 are uniformly distributed around the input shaft 22, so as to ensure uniform stress on the first driving wheels 231.

In an embodiment, the input gear pair 23 further includes a first parallel shaft 233, the first parallel shaft 233 is rotatably mounted in the case 21, the first driven wheel 232 is mounted at one end of the first parallel shaft 233, and the other end of the first parallel shaft 233 is used for connecting the parallel stage gear pair 24.

Further, based on the above embodiment, the first parallel shafts 233 are parallel to the input shaft 22, the number of the first parallel shafts 233 is the same as the number of the first driven wheels 232, and a plurality of the first parallel shafts 233 are distributed around the input shaft 22, and one first driven wheel 232 is mounted on each first parallel shaft 233. The first parallel shaft 233 is provided with a first bearing 234, and the first bearing 234 is mounted on the housing 21, so that the first parallel shaft 233 is rotatably mounted in the housing 21. The first bearings 234 are disposed on opposite sides of the first driving wheel 231, and the first bearings 234 on the side, far away from the input shaft 22, of the first driven wheel 232 are used for bearing thrust, so as to bear the axial thrust of the first driven wheel 232 and transmit the axial thrust to the box 21.

The load generated by the wind wheel acts on the hub 10, and the wind wheel thrust, gravity, torque and transverse load from the hub 10 are all transmitted to the input shaft 22 because the hub 10 is directly and rigidly connected with the input shaft 22 of the gear box 20. The input shaft 22 transmits torque to the first driving wheel 231 installed in the middle of the input shaft, and the first driving wheel 231 is simultaneously meshed with a plurality of first driven wheels 232, so that power split transmission and speed increasing transmission are realized.

Because the input gear pair 23 adopts a helical tooth design, axial forces with the same magnitude and opposite directions are generated on the first driving wheel 231 and the first driven wheel 232 in engagement, and most or all of offset can be realized between the axial force on the first driving wheel 231 and the wind wheel thrust transmitted by the input shaft 22 by selecting a proper helical angle, so that the load born by the support bearing 221 is greatly reduced. The weight, lateral load and a small portion of the remaining rotor thrust of the hub 10 are transferred to the housing 21 via support bearings 221 at both ends of the input shaft 22 and further to the frame 40. The axial force borne by the first driven wheel 232 is transferred to the thrust bearings, and because the first driven wheel 232 is in multi-split transmission, the thrust bearings are correspondingly multiple, each thrust bearing only bears part of the axial force, and the axial force is transferred to the box 21 after being dispersed and borne by the thrust bearings and then transferred to the frame 40 through the box 21.

The parallel stage gear pair 24 is installed in the box 21 and is in transmission connection with the first driven wheel 232, the output shaft 25 is installed in the box 21, the output shaft 25 is in transmission connection with the parallel stage gear pair 24, the output shaft 25 extends out of the box 21 and is connected with the generator 30, and the parallel stage gear pair 24 is used for realizing speed-increasing transmission and increasing the rotating speed of the output shaft 25. The parallel stage gear pair 24 may be formed of a primary gear pair or a multistage gear pair as needed, and the parallel stage gear pair 24 is connected to the output shaft 25 after the final stage is merged.

In one embodiment, the parallel stage gear pair 24 has a plurality of stages, the parallel stage gear pair 24 is connected to the other end of the first parallel shaft 233, and the parallel stage gear pair 24 gradually reduces the split number by power converging in the transmission path. In the present embodiment, the parallel stage gear pair 24 has two stages. It will be appreciated that in other embodiments, the number of stages of the parallel stage gear pair 24 may be specifically selected according to the speed increasing requirements.

Specifically, the parallel stage gear pair 24 includes a second driving wheel 241, a second driven wheel 242, a second parallel shaft 243, a third driving wheel 244, and a third driven wheel 245. The second driving wheel 241 is mounted at the other end of the first parallel shaft 233, and the first driven wheel 232 and the second driving wheel 241 are respectively located at both ends of the first parallel shaft 233. The second parallel shaft 243 is rotatably installed in the case 21, the second driven wheel 242 is installed at one end of the second parallel shaft 243, the second driven wheel 242 is engaged with at least one second driving wheel 241, the third driving wheel 244 is installed at the other end of the second parallel shaft 243, the third driven wheel 245 is installed on the output shaft 25, and the third driven wheel 245 is simultaneously engaged with a plurality of third driving wheels 244.

The process of the gear box 20 for realizing the speed increase from the low rotation speed and the large torque to the high speed and the small torque is specifically as follows: the first driving wheel 231 drives the first driven wheel 232 to rotate, and since the first driving wheel 231 engages with the plurality of first driven wheels 232, the speed increase of the first driven wheels 232 can be realized, thus realizing the first speed increase transmission.

Then, the first parallel shaft 233 transmits torque to the second driving wheel 241, and the second driving wheel 241 drives the second driven wheel 242 to rotate. Since each of the second driven wheels 242 engages at least one of the second driving wheels 241, a second step-up transmission can be realized.

Finally, the second parallel shaft 243 transmits torque to the third driving wheel 244, and the third driving wheel 244 drives the third driven wheel 245, thereby driving the output shaft 25 to move. Since the third driven wheel 245 engages the plurality of third driving wheels 244, a third step-up transmission can be realized. The gearbox 20 realizes the speed increase from low rotation speed and high torque to high speed and low torque through three speed increasing transmissions.

Referring to fig. 3 and 6, further, the number of the second driving wheels 241 is the same as the number of the first driven wheels 232, and each second driving wheel 241 is mounted on the corresponding first parallel shaft 233. In the present embodiment, the number of the second driving wheels 241 is 8. The number of the second driving wheels 241 is a multiple of that of the second driven wheels 242, and the second driven wheels 242 are located in a circumferential range surrounded by the second driving wheels 241, so that the second driven wheels 242 are conveniently meshed with the second driving wheels 241, and each second driven wheel 242 is meshed with a plurality of second driving wheels 241, thereby realizing speed-up transmission.

In particular, in the present embodiment, the number of the second driving wheels 241 is twice the number of the second driven wheels 242, that is, the number of the second driven wheels 242 is 4, and each of the second driven wheels 242 engages with two adjacent second driving wheels 241. It is understood that in other embodiments, the number of the second driving wheels 241 may be 1 times that of the second driven wheels 242, and the second driven wheels 242 are individually meshed with the second driving wheels 241, or the number of the second driving wheels 241 and the number of the second driven wheels 242 may be 1 times, 2 times, or 3 times, respectively, according to the circumferential distribution positions, so long as each of the second driven wheels 242 and the second driving wheels 241 can be normally meshed.

Referring to fig. 7, in a specific embodiment, the second parallel shafts 243 are rotatably installed in the housing 21 through bearings, and the number of the second parallel shafts 243 is the same as the number of the second driven wheels 242, and one second driven wheel 242 is installed on each second parallel shaft 243. The second parallel axis 243 is parallel to the first parallel axis 233, and the second parallel axis 243 is located between the first parallel axis 233 and the input shaft 22. The number of the third driving wheels 244 is the same as that of the second parallel shafts 243, so that the second driven wheels 242 and the third driving wheels 244 are respectively arranged at two ends of the second parallel shafts 243. In the present embodiment, the number of the third driving wheels 244 is 4.

In an embodiment, the first driven wheel 232 is integrally formed on the first parallel shaft 233, the second driven wheel 242 is integrally formed on the second parallel shaft 243, and the first parallel shaft 233 and the second parallel shaft 243 are gear shafts, so that the installation process is simple, and the compactness of the structure is ensured. The third driving wheel 244 surrounds the third driven wheel 245, and a plurality of the third driving wheels 244 are engaged with the third driven wheel 245. In this embodiment, 4 third driving wheels 244 are meshed with third driven wheels 245.

In an embodiment, the second parallel shaft 243 is provided with a connecting sleeve 246, the third driving wheel 244 is mounted on the connecting sleeve 246 through bolts, and the third driving wheel 244 is mounted on the second parallel shaft 243. A connecting shaft 26 is arranged in the output shaft 25 in a penetrating way, the third driven wheel 245 is integrally formed on the connecting shaft 26, and the connecting shaft 26 is flexibly connected with the output shaft 25. The connecting shaft 26 and the output shaft 25 are flexibly connected, so that the output shaft 25 can deviate in angle or radial direction relative to the connecting shaft 26, and the connection of the output shaft 25 and the generator 30 is facilitated. Specifically, the connection shaft 26 is flexibly connected to the output shaft 25 through a rubber joint 27.

In one embodiment, the case 21 includes a front cover 211, a first housing 212, a second housing 213, a third housing 214, and a rear cover 215, which are sequentially connected. The input stage gear pair 23 is disposed in the first housing 212, the second driving wheel 241 and the second driven wheel 242 are disposed in the second housing 213 and the third housing 214, and the third driving wheel 244 and the third driven wheel 245 are disposed in the rear end cover 215. The box 21 is formed by splicing multiple parts, so that the input stage gear pair 23 and the parallel stage gear pair 24 can be conveniently assembled and disassembled.

In an embodiment, the wind generating set further comprises an electrical system, a yaw system, a pitch system, a cooling system and a control system, wherein the electrical system is used for processing electric energy generated by the set generator 30 and then accessing the electric network, the yaw system is connected with the tower and the nacelle and is used for deflecting the wind wheel, the pitch system is arranged in the hub 10 and is used for adjusting the pitch angle of the wind wheel blade, the cooling system is used for performing cooling protection on gears, bearings and electrical components in the transmission chain, and the control system is used for monitoring the running state of the set and controlling the running of the set.

In the wind turbine generator system, the main shaft function is integrated with the structural design of the gear box 20, and the input shaft 22, the support bearing 221 and the box 21 of the gear box 20 are used for bearing the main shaft, the main shaft bearing and the bearing seat. The transmission chain of the unit has no independent main shaft component and input coupling, and the hub 10 of the wind wheel is directly arranged at the input end of the gear box 20. The gear box 20 in the unit adopts a multi-split parallel transmission technology, and power branches are distributed around the input shaft 22, so that radial space is fully utilized. The input shaft 22 integrates the main shaft function and is provided with a first driving gear 231 in the middle, so that the input shaft 22 simultaneously carries wind wheel thrust and gear meshing axial force to realize mutual offset. The multiple-split structure simultaneously distributes the meshing axial force (wind wheel thrust) born by the gear box 20 according to the split quantity and then transmits the distributed force to the box body 21, so that the loaded deformation of the box body 21 is relieved. The hub 10 is directly connected with the gear box 20, and the coupling is omitted, so that the complexity of a transmission chain system is reduced, the installation and debugging are simplified, the risk brought by the coupling is reduced, the reliability of the unit is improved, and the cost of the unit is reduced.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.

Claims

1. The utility model provides a wind generating set, its characterized in that includes tower section of thick bamboo, cabin, drive chain system and wind wheel, the cabin install in the top of tower section of thick bamboo, drive chain system install in the frame in the cabin, the wind wheel with drive chain system connects, drive chain system includes reducing gear box and generator, the reducing gear box includes:

the box body is arranged on the rack;

the input gear pair comprises a first driving wheel and a first driven wheel, wherein the first driving wheel is arranged at the end part of the input shaft, which is positioned in the box body, the first driven wheel is arranged in the box body, a plurality of first driven wheels are distributed around the first driving wheel and meshed with the first driving wheel, the first driving wheel and the first driven wheel are bevel gears, the first main hole wheel and the first driven wheel generate axial forces with the same size and opposite directions, the axial forces on the first driving wheel face the outside of the box body and are mostly or totally offset with wind wheel thrust transmitted by the input shaft, and the axial forces born by the first driven wheel are transmitted to the box body;

2. The wind turbine of claim 1, wherein support bearings are mounted on the input shaft at intervals, the support bearings being mounted in the housing.

3. The wind turbine of claim 1, wherein the input gear pair further comprises a first parallel shaft rotatably mounted in the housing, the first driven wheel is mounted at one end of the first parallel shaft, and the other end of the first parallel shaft is connected to the parallel stage gear pair.

4. A wind generating set according to claim 3, wherein a first bearing is provided on the first parallel shaft, the first bearing is mounted on the housing, and the first bearing on a side of the first driven wheel remote from the input shaft is a thrust bearing.

5. A wind power plant according to claim 3, characterized in that the parallel stage gear pair has a plurality of stages, which in the transmission path gradually reduces the number of splits by means of power converging.

6. The wind turbine of claim 5, wherein the parallel stage gear pair includes a second driving wheel, a second driven wheel, a second parallel shaft, a third driving wheel and a third driven wheel, the second driving wheel is mounted at the other end of the first parallel shaft, the second parallel shaft is rotatably mounted in the box, the second driven wheel is mounted at one end of the second parallel shaft, the second driven wheel is meshed with at least one of the second driving wheels, the third driving wheel is mounted at the other end of the second parallel shaft, the third driven wheel is mounted on the output shaft, and the third driven wheel is meshed with a plurality of the third driving wheels.

7. The wind generating set of claim 6, wherein the first driven wheel is integrally formed on the first parallel shaft and the second driven wheel is integrally formed on the second parallel shaft.

8. The wind generating set of claim 6, wherein the number of second driven wheels is a multiple of the second driven wheels, the second driven wheels being located within an area surrounded by the second driven wheels, each of the second driven wheels engaging a plurality of the second driven wheels.

9. The wind generating set according to claim 6, wherein a connecting shaft is provided in the output shaft in a penetrating manner, the third driven wheel is integrally formed on the connecting shaft, and the connecting shaft is flexibly connected with the output shaft.

10. The wind generating set of claim 1, further comprising an electrical system for processing electrical energy generated by the set generator and then accessing the grid, a yaw system for connecting the tower and the nacelle for deflecting the rotor, a pitch system mounted in the hub for adjusting the pitch angle of the rotor blades, a cooling system for cooling and protecting gears, bearings and electrical components in the drive train, and a control system for monitoring the operational status of the set and controlling the operation of the set.