CN109469591B

CN109469591B - Transmission mechanism and transmission method of wind generating set and wind generating set

Info

Publication number: CN109469591B
Application number: CN201710802356.0A
Authority: CN
Inventors: 王永刚; 王珺
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Jinfeng Technology Co ltd
Priority date: 2017-09-07
Filing date: 2017-09-07
Publication date: 2020-05-19
Anticipated expiration: 2037-09-07
Also published as: CN109469591A

Abstract

The embodiment of the invention provides a transmission mechanism, a transmission method and a wind generating set of the wind generating set, wherein the transmission mechanism is used for blades, a generator and a cabin of the wind generating set, the root of each blade is connected with a connecting shaft, the generator is arranged in the cabin, a transmission block is arranged at the front end of a rotor of the generator, and the connecting shaft drives the transmission block to drive the rotor of the generator to rotate. According to the transmission mechanism and the transmission method of the wind generating set and the wind generating set, the blades drive the transmission block to further drive the generator rotor to rotate for power generation, the vibration of the blades has small influence on the generator rotor, so that the blade mechanism of the wind generating set is more reasonable, the transmission effect is more stable, and the service life of the wind generating set is prolonged.

Description

Transmission mechanism and transmission method of wind generating set and wind generating set

Technical Field

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

Background

The wind generating set generally comprises a nacelle, a tower, a yaw device and an impeller, wherein the impeller is connected with the nacelle through a low-speed shaft at the center of the impeller so as to drive a generator rotor in the nacelle to generate electricity. The low-speed shaft serves as a connecting component between the impeller and the engine room (the gravity of the impeller is transmitted to the engine room through the low-speed shaft), and also serves as a driving component for generating power by the rotor of the generator. Therefore, the existing wind generating set has high requirements on the design and manufacture of the low-speed shaft and the assembly of the low-speed shaft.

Disclosure of Invention

In view of the above technical problems, embodiments of the present invention provide a transmission mechanism and a transmission method for a wind turbine generator system, and a wind turbine generator system, which solve the technical problems that the existing transmission mode for the wind turbine generator system has high requirements on design and manufacture of a low-speed shaft and assembly of the low-speed shaft.

The embodiment of the invention provides a transmission mechanism of a wind generating set, which is used for blades, a generator and a cabin of the wind generating set, wherein the root part of each blade is connected with a connecting shaft, the generator is arranged in the cabin, a transmission block is arranged at the front end of a rotor of the generator, and the connecting shaft drives the transmission block to drive the rotor of the generator to rotate.

Alternatively, the driving block is ring-shaped and is provided with a groove corresponding to each blade, and the connecting shaft of the blade passes through the groove.

Optionally, the blade is provided with a rolling support member, the rolling support member is located in the groove, and the blade is in contact with the groove through the rolling support member.

The embodiment of the invention provides a transmission method of a wind generating set, which comprises the following steps:

the connecting shaft of the blade drives a transmission block at the front end of the generator rotor, and the transmission block drives the generator rotor to rotate to generate power.

Alternatively, the connection between the blade and the driving block is a rolling connection by means of rolling support members provided on the blade.

The embodiment of the invention provides a wind generating set, which comprises the transmission mechanism.

Optionally, the forward end of the nacelle is cylindrical in shape.

Optionally, the connecting shaft is in rolling connection with the front end of the nacelle through a rolling connection.

Optionally, the rolling connection devices are support rollers, and one support roller is mounted on the connection shaft of each blade, and the support rollers make circular motion along the front end of the nacelle.

Optionally, the front end of the nacelle is provided with an annular rail, and the support rollers are slidably connected with the annular rail through connecting rods.

Optionally, the cross-section of the circular track is a T-shaped slot, and the end of the connecting rod is connected in the T-shaped slot.

Alternatively, the rolling connection is a thrust bearing to which all the blades are connected.

Optionally, the connecting shaft is provided with hobbing; correspondingly, a variable pitch driving mechanism is arranged to drive the gear hobbing to enable the blade to change the pitch.

Optionally, the pitch drive mechanism includes a shaft, first and second chainrings mounted on the shaft and engaged with the rollers of the blades, and a planetary gear drive structure mounted on the shaft, the planetary gear drive structure driving one of the first and second chainrings, the shaft driving the other of the first (520) and second chainrings to counter-rotate the first and second chainrings.

Optionally, the device further comprises a bridge assembly sleeved on the rotating shaft and comprising a bridge and outer bridge rollers which are coaxially arranged.

Optionally, an inner bridge roller is arranged between the bridge and the rotating shaft.

Optionally, the rear end of the rotating shaft is connected with the driving motor through a clutch.

Optionally, the nacelle further comprises a nacelle cover fastened to the front end of the nacelle to accommodate the rolling connection device and the bridge assembly therein.

Optionally, the air guide sleeve is of a split structure and is connected in a splicing mode to form a cover body.

According to the transmission mechanism and the transmission method of the wind generating set and the wind generating set, the blades drive the transmission block to further drive the generator rotor to rotate for power generation, the vibration of the blades has small influence on the generator rotor, so that the blade mechanism of the wind generating set is more reasonable, the transmission effect is more stable, and the service life of the wind generating set is prolonged.

Drawings

The invention may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which:

other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.

Fig. 1 is a schematic structural diagram of a wind turbine generator system according to an embodiment of the present invention;

FIG. 2 is a schematic view of a nacelle coupled to a blade according to an embodiment of the present invention;

FIG. 3 is a schematic view of a connection structure between a pitch drive mechanism and a blade according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a pitch drive mechanism provided in an embodiment of the present invention;

FIG. 5 is a schematic view of a portion of a pitch drive mechanism provided in accordance with an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a connection shaft according to an embodiment of the present invention.

In the figure:

100. a blade; 110. a connecting shaft; 111. hobbing; 120. supporting the rollers; 121. a connecting rod; 130. a rolling support member;

200. a bridge assembly;

300. a nacelle; 310. an annular track;

400. a transmission block; 410. a groove;

500. a variable pitch drive mechanism; 510. a rotating shaft; 520. a first fluted disc; 530. a second fluted disc; 540. a planetary gear drive structure; 550. a bridge frame; 560. an outer roller of the bridge frame; 570. an inner roller of the bridge frame; 580. a clutch; 590. an end cap;

600. and a flow guide cover.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. In the drawings, the thickness of regions and layers may be exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

As shown in fig. 1-6: the embodiment of the invention provides a transmission mechanism of a wind generating set, which comprises a tower (not shown in the figure), blades 100, a generator (not shown in the figure) and a machine room 300, wherein the root parts of the blades 100 are connected with a connecting shaft 110, the generator is arranged in the machine room 300, a transmission block 400 is arranged at the front end of a rotor of the generator, and the connecting shaft 110 drives the transmission block 400 to drive the rotor of the generator to rotate. In this embodiment, the low-speed shaft does not need to be separately designed, and the connecting shaft 110 is used to drive the transmission block 400 to drive the rotor of the generator to rotate, so as to enable the generator to generate electricity.

According to the transmission mechanism of the wind generating set provided by the embodiment of the invention, the blades drive the transmission block to further drive the generator rotor to rotate for generating power, the influence of the vibration of the blades on the generator rotor is small, so that the blade mechanism of the wind generating set is more reasonable, the transmission effect is more stable, and the service life of the wind generating set is prolonged.

In the transmission mechanism of the wind generating set provided by the embodiment, the transmission block 400 is annular, a groove 410 is formed corresponding to each blade 100, the connecting shaft 110 of each blade 100 penetrates through the groove 410, the groove 410 is driven by the connecting shaft 110 of each blade 100, and then the transmission block 400 drives the rotor of the generator to rotate, so that the generator generates electricity.

According to the transmission mechanism of the wind generating set provided by the embodiment, the blade 100 is provided with the rolling support part 130, the rolling support part 130 is positioned in the groove 410, and the blade 100 is in contact with the groove 410 through the rolling support part 130. In the process of generating power by the wind generating set under the action of wind power, the pitch angle of the blade 100 also needs to be controlled according to the size of the wind power, the blade 100 rotates around the connecting shaft 110 in the pitch changing process, the rolling support component 130 is designed on the connecting shaft 110, so that sliding friction cannot be generated between the connecting shaft 110 and the groove 410 in the pitch changing process of the blade 100, the sliding friction is replaced by the rolling friction of the rolling support component 130, the pitch changing of the blade 100 is easier to control, and the friction resistance in the pitch changing process is reduced. The rolling support member 130 may be a bearing type structure.

The embodiment also provides a transmission method of the wind generating set, which comprises the following steps:

the connecting shaft 110 of the blade 100 drives the transmission block 400 at the front end of the generator rotor, and the transmission block 400 drives the generator rotor to rotate to generate power.

According to the transmission method of the wind generating set, the blades drive the transmission block to further drive the generator rotor to rotate for power generation, the vibration of the blades has small influence on the generator rotor, so that a blade mechanism of the wind generating set is more reasonable, the transmission effect is more stable, and the service life of the wind generating set is prolonged.

The rolling support component 130 arranged on the blade 100 enables the connection between the blade and the transmission block to be rolling connection, so that the blade 100 does not generate sliding friction with the transmission block 400 in the process of changing the pitch of the blade 100, the friction force between the blade 100 and the transmission block is reduced, and the smooth completion of the pitch change is promoted.

The embodiment also provides a wind generating set, which uses the transmission mechanism of the wind generating set provided by the above embodiment. The wind generating set that this embodiment provided drives the transmission piece and then drives generator rotor through the blade and rotates the electricity generation, and the vibration of blade is less to generator rotor influence, makes wind generating set's blade mechanism more reasonable, and transmission effect is more stable, improves wind generating set's life.

In the wind turbine generator system provided by the present embodiment, the connecting shaft 110 is in rolling connection with the front end of the nacelle 300 through a rolling connection device, so that the blade 100 directly transmits the load to the nacelle 300 through the connecting shaft 110, and during the rotation of the blade 100, the connecting shaft 110 is in rolling connection with the nacelle 300 through the rolling connection device, wherein the rolling connection device may be, for example, an integral thrust bearing, or a supporting roller 120 designed for each blade,

in the wind turbine generator system of the present embodiment, the front end of the nacelle 300 is cylindrical to design the annular rail 310 for the thrust bearing, or for the support roller 120.

In the wind turbine generator system provided by the present embodiment, the rolling connection device is a support roller 120, and one support roller 120 is mounted on the connection shaft 110 of each blade 100, and the support roller makes a circular motion along the front end of the nacelle 300. The support rollers 120 may enable the relative movement between the connecting shaft 110 and the nacelle 300 to be rolling friction, which reduces the transmission resistance between the nacelle 300 and the blade 100 while enabling the nacelle 300 to provide load support for the blade 100.

In the wind turbine generator set provided by the present embodiment, the front end of the nacelle 300 is provided with an annular rail 310, and the support roller 120 is slidably connected with the annular rail 310 through the connecting rod 121. The circular track 310 is designed corresponding to the connecting rod 121, the connecting rod 121 can make circular motion along the circular track 310, and a limiting structure can be designed on the connecting rod to prevent the connecting rod 121 from separating from the circular track 310.

In the wind turbine generator set provided by the embodiment, the section of the annular rail 310 is a T-shaped groove, the end of the connecting rod 121 is connected in the T-shaped groove, and correspondingly, a T-shaped block matched with the T-shaped groove is arranged at the end of the connecting rod 121, so that the blade 100 is prevented from being separated from the nacelle 300 when the blade bears the side wind. When the blade is not subjected to the side wind, the T-shaped blocks are in clearance fit with the T-shaped grooves, so that the resistance between the blade 100 and the nacelle 300 is not increased.

In the wind turbine generator system provided in the present embodiment, the rolling connection device is a thrust bearing (not shown in the figure), and all the blades 100 are connected to the thrust bearing. One end ring of the thrust bearing is connected to the nacelle 300, the other end ring is a free end, and all the blades 100 are fixedly connected to the other end ring of the thrust bearing, respectively, so that the thrust bearing can carry the load of all the blades 100.

In the wind turbine generator system provided by the embodiment, the connecting shaft 110 is provided with the hobbing 111; correspondingly, a pitch drive mechanism 500 is provided to drive the gear hobbing 111 to pitch the blade 100. Can drive three blade 100 simultaneously through one become oar actuating mechanism 500 and become the oar, simple structure all needs the drive of solitary change oar mechanism to become the oar to compare with every blade among the prior art, the wind generating set that this embodiment provided can control three blade 100 and become the oar in step to can realize accurate control.

In the wind turbine generator set provided by this embodiment, the pitch driving mechanism 500 includes a rotating shaft 510, a first toothed disc 520 and a second toothed disc 530 mounted on the rotating shaft and engaged with the hobbing teeth 111 of the blades 100, and a planetary gear driving structure 540 mounted on the rotating shaft, where the planetary gear driving structure 540 drives the first toothed disc 520 to rotate the first toothed disc 520 and the second toothed disc 530 in opposite directions, where internal teeth need to be machined on the first toothed disc, and external teeth are provided at the front end of the rotating shaft 510, and through a planetary gear transmission, the rotation direction of the first toothed disc 520 is opposite to the rotation direction of the rotating shaft 510, and the second toothed disc 530 is driven by the rotating shaft 510 to rotate the first toothed disc 520 and the second toothed disc 530 in opposite directions. As will be understood by those skilled in the art, the planetary gear driving structure 540 can be designed for the second gear plate such that the second gear plate 530 rotates in a direction opposite to the rotation direction of the rotating shaft 510, and the first gear plate is driven by the rotating shaft 510 to rotate, so that the first gear plate 520 and the second gear plate 530 rotate in opposite directions.

The wind turbine generator set provided by the embodiment further includes a bridge assembly 200 sleeved on the rotating shaft 510, and includes a bridge 550 and a bridge outer roller 560, which are coaxially disposed, wherein the bridge 550 is in contact with the first toothed disc 520, the bridge outer roller 560 is in contact with the second toothed disc 530, and the first toothed disc 520 and the second toothed disc 530 freely rotate in opposite directions through the bridge outer roller 560 without being constrained by the opposite rotation.

In the wind turbine generator system provided by this embodiment, an inner bridge roller 570 is disposed between the bridge 550 and the rotating shaft 510. Since the rotation direction of the rotating shaft 510 is opposite to that of the first toothed disc 520, the bridge internal gear 570 is disposed to allow the first toothed disc 520 and the rotating shaft 510 to freely rotate in opposite directions without being restricted by the opposite rotation.

In the wind turbine generator system provided by this embodiment, the rear end of the rotating shaft 510 is connected to the driving motor through the clutch 580, when a pitch change is required, the clutch 580 attracts and drives the rotating shaft 510 to drive the first toothed disc 520 and the second toothed disc 530 to rotate in the opposite direction, when the pitch change is not required, the clutch 580 is disengaged, and at this time, only the rotating shaft 510 rotates along with the bridge assembly 200.

The wind turbine generator system further includes a nacelle 600 fastened to the front end of the nacelle 300, so as to accommodate the rolling connection device and the bridge assembly 200 therein. The pod 600 may be streamlined to reduce the resistance of the pod 600 to airflow. Typically, the outer surface of the pod 600 is a solid of revolution design.

The dome 600 is a split structure and is connected to form a cover body in a splicing manner. The guide sleeve 600 with the split structure can be cut into a plurality of split structures, for example, three same split structures or six same (or symmetrical) split structures can be made, and mounting holes are reserved at positions corresponding to the blades 100, so that the processing, the manufacturing and the mounting are simple and feasible. Compared with an integral structure, the air guide sleeve 600 adopting the split structure has higher practicability in the implementation process.

It will be appreciated by persons skilled in the art that the above embodiments are illustrative and not restrictive. Different features which are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to denote a name and not to denote any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The functions of the various parts appearing in the claims may be implemented by a single hardware or software module. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. A transmission mechanism of a wind generating set comprises a blade (100), a generator and a machine room (300), and is characterized in that the root of the blade (100) is connected with a connecting shaft (110), the generator is arranged in the machine room (300), a transmission block (400) is arranged at the front end of a rotor of the generator, and the connecting shaft (110) drives the transmission block (400) to drive the rotor of the generator to rotate;

the transmission block is annular in shape, and a groove (410) is provided corresponding to each blade (100), and the connecting shaft (110) of the blade (100) passes through the groove (410).

2. The wind turbine generator system transmission of claim 1,

the blade (100) is provided with a rolling support part (130), the rolling support part (130) is positioned in the groove (410), and the blade (100) is in contact with the groove (410) through the rolling support part (130).

3. A transmission method of a wind generating set comprises the following steps:

the transmission block (400) at the front end of the generator rotor is driven by the connecting shaft (110) of the blade (100), the generator rotor is driven by the transmission block (400) to rotate to generate electricity, the transmission block (400) is annular, a groove (410) is formed corresponding to each blade (100), and the connecting shaft (110) of each blade (100) penetrates through the groove (410).

4. The method of claim 3, wherein the wind turbine generator system is driven by a motor,

the connection between the blade and the transmission block is made to be a rolling connection by a rolling support member (130) provided on the blade (100).

5. A wind power plant comprising a transmission according to any of claims 1-2.

6. The wind turbine of claim 5,

the front end of the nacelle (300) is cylindrical.

7. The wind turbine of claim 5,

the connecting shaft (110) is in rolling connection with the front end of the cabin (300) through a rolling connection device.

8. The wind turbine of claim 7,

the rolling connection device is a support roller (120), one support roller (120) is mounted on the connection shaft (110) of each blade (100), and the support rollers do circular motion along the front end of the nacelle (300).

9. The wind turbine of claim 8,

the front end of the nacelle (300) is provided with an annular rail (310), and the support rollers (120) are connected with the annular rail (310) in a sliding mode through connecting rods (121).

10. The wind turbine of claim 9,

the section of the annular track (310) is a T-shaped groove, and the end part of the connecting rod (121) is connected in the T-shaped groove.

11. The wind turbine of claim 7,

the rolling connection is a thrust bearing to which all the blades (100) are connected.

12. The wind turbine of claim 7,

the connecting shaft (110) is provided with hobbing (111); correspondingly, a variable pitch driving mechanism (500) is provided, and the hobbing (111) is driven to change the pitch of the blade (100).

13. The wind turbine of claim 12,

the variable-pitch driving mechanism (500) comprises a rotating shaft (510), a first fluted disc (520) and a second fluted disc (530) which are installed on the rotating shaft and meshed with the hobbing teeth (111) of the blade (100), and a planetary gear driving structure (540) which is installed on the rotating shaft (510), wherein the planetary gear driving structure (540) drives one of the first fluted disc (520) and the second fluted disc (530), and the rotating shaft (510) drives the other of the first fluted disc (520) and the second fluted disc (530) to enable the first fluted disc (520) and the second fluted disc (530) to rotate reversely.

14. The wind turbine of claim 13,

the cable bridge assembly is characterized by further comprising a bridge assembly (200) which is sleeved on the rotating shaft (510) and comprises a bridge (550) and a bridge outer roller (560) which are coaxially arranged.

15. The wind turbine of claim 14,

and a bridge inner roller (570) is arranged between the bridge (550) and the rotating shaft (510).

16. The wind turbine of claim 13,

the rear end of the rotating shaft (510) is connected with a driving motor through a clutch (580).

17. The wind turbine of claim 14,

the wind guide cover is buckled at the front end of the engine room (300) so as to accommodate the rolling connection device and the bridge assembly (200) therein.

18. The wind turbine of claim 17,

the air guide sleeve (600) is of a split structure and is connected in a splicing mode to form a cover body.