CN108533463B

CN108533463B - Wind generating set and low-speed end coupling thereof

Info

Publication number: CN108533463B
Application number: CN201810332390.0A
Authority: CN
Inventors: 张天琦; 蒋琼; 胡爱田
Original assignee: Sany Renewable Energy Co Ltd
Current assignee: Sany Renewable Energy Co Ltd
Priority date: 2018-04-13
Filing date: 2018-04-13
Publication date: 2020-02-21
Anticipated expiration: 2038-04-13
Also published as: CN108533463A

Abstract

The invention discloses a low-speed end flexible coupling of a wind generating set, which is used for connecting a wind wheel and a speed increaser, wherein the low-speed end flexible coupling comprises a driving disc and a driven disc which are coaxially arranged, the driving disc is used for connecting a main bearing of the wind wheel, the driven disc is used for connecting an input shaft of the speed increaser, and the driving disc and the driven disc are connected through at least one flexible transmission chain. The low-speed end flexible coupling can only transmit the pure torque of the wind wheel to the speed increaser; the coaxiality requirement between the wind wheel main bearing and the input shaft of the speed increaser is greatly reduced, and meanwhile, automatic load balancing can be realized. The invention further discloses a wind generating set.

Description

Wind generating set and low-speed end coupling thereof

Technical Field

The invention relates to the technical field of couplers, in particular to a wind generating set and a low-speed end coupler thereof.

Background

The wind generating set is a device for converting wind energy into electric energy, utilizes wind power to drive blades and a wind wheel to rotate, then speeds up the rotating speed through a speed increaser, and then drives a generator to rotate to generate electricity. The transmission of power and torque among the wind wheel, the speed increaser and the generator all needs to use a transmission part, the transmission between the wind wheel and the speed increaser is called low-speed end transmission according to the difference of rotating speed, and the transmission between the speed increaser and the generator is called high-speed end transmission.

In the existing transmission system of the wind generating set, the wind wheel and the input shaft of the speed increaser, namely the low-speed end transmission, are generally connected in a rigid or semi-rigid mode, the low rotating speed and the large torque of the wind wheel are transmitted to the speed increaser, and after the speed is increased by the speed increaser, the wind wheel is transmitted to the generator from the output shaft of the speed increaser through the high-speed end coupler. This construction requires a high degree of coaxiality between the main bearing of the rotor and the input shaft of the speed-increasing gear, which would otherwise be subjected to additional loads and to vibrations, which in the extreme case could jeopardize the normal operation and service life of the wind energy installation.

For example, the conventional mainstream three-point support structure and four-point support structure are commonly used. In a traditional mainstream three-point support structure, a speed increaser needs to bear torque and radial force, a front end bearing of the speed increaser needs to bear huge radial force, and the design and manufacture of a rear two-point elastic support are very complicated. In the four-point support type structure, the requirement on the machining precision of six installation planes of the under frame of the engine room is higher, and otherwise, larger additional load and vibration can be generated.

Disclosure of Invention

The invention aims to provide a low-speed shaft coupler for a wind driven generator and the wind driven generator, and aims to solve the technical problem that the coaxiality of a wind wheel and a speed increaser is high when a rigid transmission part is adopted in the prior art.

The invention provides a low-speed end flexible coupling of a wind generating set, which is used for connecting a wind wheel and a speed increaser, wherein the low-speed end flexible coupling comprises a driving disc and a driven disc which are coaxially arranged, the driving disc is used for connecting a main bearing of the wind wheel, the driven disc is used for connecting an input shaft of the speed increaser, and the driving disc and the driven disc are connected through at least one flexible transmission chain.

Furthermore, at least one group of connecting components is arranged between the driving disc and the driven disc, each group of connecting components comprises a plurality of first connecting pins which are arranged on the circumferential direction of the driving disc at intervals and a plurality of second connecting pins which are arranged on the circumferential direction of the driven disc at intervals, and the first connecting pins and the second connecting pins are arranged in a staggered mode; the flexible transmission chain is sequentially wound on the first connecting pin and the second connecting pin.

Further, flexible drive chain specifically is two, coupling assembling specifically is two sets of, and every group coupling assembling goes up around being equipped with a flexible drive chain.

Furthermore, the inner ring cylindrical surface of the driving disc is circumferentially provided with first mounting grooves, two ends of each first connecting pin are respectively and fixedly connected to two side walls of the first mounting grooves, the outer ring cylindrical surface of the driven disc is circumferentially provided with second mounting grooves, two ends of each second connecting pin are respectively and fixedly connected to two side walls of the second mounting grooves, and the flexible transmission chain is sequentially wound on the first connecting pins and the second connecting pins.

Furthermore, a plurality of first pin holes are formed in the circumferential direction of the driving disc, the first connecting pins penetrate through the first pin holes, and at least one end of each first connecting pin extends out of a preset length along the radial direction of the driving disc; the driven disc is provided with a plurality of second pin holes in the circumferential direction, the second connecting pins penetrate through the second pin holes, and at least one end of each second connecting pin extends out of a preset length along the radial direction of the driven disc; the flexible transmission chain is wound on the first connecting pin and the second connecting pin.

Further, the two flexible transmission chains are symmetrically arranged on two sides of the first connecting pin and the second connecting pin.

Further, the flexible transmission chain is made of metal or high-strength fiber.

The low-speed end flexible coupling is used for connecting a wind wheel and a speed increaser to transmit torque, and a driving disc connected with a main bearing of the wind wheel and a driven disc connected with an input shaft of the speed increaser in the coupling are connected through a flexible transmission chain, so that the pure torque of the wind wheel can be transmitted to the speed increaser; meanwhile, the coaxiality requirement between the wind wheel main bearing and the input shaft of the speed increaser is greatly reduced, so that the machining precision requirement is greatly reduced, and even if the coaxiality is out of tolerance, no extra load is brought to the speed increaser; secondly, the machining requirement on the bottom frame of the engine room is simple; in addition, because each group of connecting components of the driving disc and the driven disc are connected by a whole flexible transmission chain, the stress is balanced, and the automatic load balancing can be realized.

In a second aspect of the present invention, a wind generating set is further provided, which includes a wind wheel, a speed-increasing machine, and any one of the above-mentioned low-speed end flexible couplings, where an active disc of the low-speed end flexible coupling is connected to a main bearing of the wind wheel, and a passive disc of the low-speed end flexible coupling is connected to an input shaft of the speed-increasing machine.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a coupling according to an embodiment of the present invention;

FIG. 2 is a cross-sectional schematic view of the mounting structure of FIG. 1;

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;

fig. 4 is an enlarged sectional view of the mounting structure of the coupling according to the embodiment of the present invention.

In the figure:

1. a driving disk; 11. a first connecting pin; 12. a first mounting groove; 2. a driven disc; 21. a second connecting pin; 22. a second mounting groove; 3. a flexible drive chain; 41. a main bearing; 42. an input shaft.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in fig. 1, fig. 2, and fig. 3, the low-speed end flexible coupling of the wind turbine generator system of this embodiment is used for connecting a wind wheel and a speed-increasing machine, the low-speed end flexible coupling includes a driving disk 1 and a driven disk 2 coaxially disposed, the driving disk 1 is used for connecting a main bearing 41 of the wind wheel, the driven disk 2 is used for connecting an input shaft 42 of the speed-increasing machine, and the driving disk 1 and the driven disk 2 are connected by a flexible transmission chain 3.

Specifically, be equipped with two sets of coupling assembling between initiative dish 1 and the passive dish 2, flexible driving chain 3 specifically adopts two, winds on every group coupling assembling and is equipped with a flexible driving chain 3.

Each group of connecting components comprises a plurality of first connecting pins 11 arranged on the circumferential direction of the driving disc 1 at intervals and a plurality of second connecting pins 21 arranged on the circumferential direction of the driven disc 2 at intervals, wherein the first connecting pins 11 and the second connecting pins 21 are arranged in a staggered mode; the flexible transmission chain 3 is sequentially wound on the first connecting pin 11 and the second connecting pin 21, and after the flexible transmission chain 3 is arranged, the whole flexible transmission chain is in a wave shape.

The installation fixed mode of first connecting pin 11 and second connecting pin 21 has multiple mode, in this embodiment one, specifically be equipped with first mounting groove 12 along circumference at the inner circle face of cylinder of driving

disk

1, 11 both ends of a plurality of first connecting pin are fixed connection respectively on the both sides wall of first mounting groove 12, the outer lane face of cylinder of driven disk 2 is equipped with second mounting groove 22 along circumference, a plurality of second connecting pin 21 both ends are fixed connection respectively on the both sides wall of second mounting groove 22, flexible driving chain 3 is around the middle section position of locating first connecting pin 11 and second connecting pin 21 in proper order, and hold in first mounting groove 12 and second mounting groove 22. By adopting the groove type mounting structure, the first connecting pin 11 and the second connecting pin 21 are more stably mounted and fixed and are more uniformly stressed.

The flexible transmission chain 3 has various optional structures and materials, and particularly, the chain structure is preferably made of metal or high-strength filament drawn fibers.

It should be noted that, in the first embodiment, the flexible transmission chain 3 is preferably designed to be two in consideration of the structural complexity, the stress analysis and the manufacturing cost, but the present invention is not limited thereto, and may be designed to be one, three or more, and similarly, the corresponding connecting assemblies are preferably designed to be two groups, and may also be designed to be one group, three groups or more.

Example two

The second embodiment is different from the first embodiment in that the first connecting pin 11 and the second connecting pin 21 are installed and fixed in different manners, as shown in fig. 4, in the second embodiment, in order to simplify the structure and the assembly difficulty and reduce the cost, the driving disk 1 is provided with a plurality of first pin holes (not shown in the figure by being shielded) in the circumferential direction, the first connecting pin 11 is inserted into the first pin hole, and at least one end of the first connecting pin 11 extends out of a predetermined length along the radial direction of the driving disk 1; a plurality of second pin holes are formed in the driven disc 2 in the circumferential direction, the second connecting pins 21 are arranged in the second pin holes (not shown in the figures in a shielding manner) in a penetrating manner, and at least one ends of the second connecting pins 21 extend out of a preset length along the radial direction of the driven disc 2; each flexible transmission chain 3 is respectively arranged on the corresponding connecting component, namely sequentially wound on the first connecting pin 11 and the second connecting pin 21 which are arranged in a staggered manner. Specifically, the two flexible transmission chains 3 may be symmetrically disposed on two sides of the first connecting pin 11 and the second connecting pin 21, or disposed on the same side of the first connecting pin 11 and the second connecting pin 21, and the embodiment is not limited thereto.

The low-speed end flexible coupling provided by the first embodiment and the second embodiment is used for connecting a wind wheel and a speed increaser to transmit torque, and a driving disc connected with a main bearing of the wind wheel and a driven disc connected with an input shaft of the speed increaser in the coupling are connected through a flexible transmission chain, so that the pure torque of the wind wheel can be transmitted to the speed increaser; meanwhile, the coaxiality requirement between the wind wheel main bearing and the input shaft of the speed increaser is greatly reduced, so that the machining precision requirement is greatly reduced, and even if the coaxiality is out of tolerance, no extra load is brought to the speed increaser; secondly, the machining requirement on the bottom frame of the engine room is simple; in addition, because each group of connecting components of the driving disc and the driven disc are connected by a whole flexible transmission chain, the stress is balanced, and the automatic load balancing can be realized.

EXAMPLE III

On the basis, the third embodiment further provides a wind generating set, which comprises a wind wheel, a speed increaser and the low-speed end flexible coupling, wherein the driving disc 1 of the low-speed end flexible coupling is connected with the main bearing 41 of the wind wheel, and the driven disc 2 of the low-speed end flexible coupling is connected with the input shaft 42 of the speed increaser.

Due to the adoption of the low-speed end flexible coupling, all advantages of the coupling are achieved, and the description is omitted.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A low-speed end flexible coupling of a wind generating set is used for connecting a wind wheel and a speed increaser, and is characterized in that the low-speed end flexible coupling comprises a driving disc (1) and a driven disc (2) which are coaxially arranged, the driving disc (1) is used for connecting a main bearing (41) of the wind wheel, the driven disc (2) is used for connecting an input shaft (42) of the speed increaser, and the driving disc (1) and the driven disc (2) are connected through at least one flexible transmission chain (3); at least one group of connecting components are arranged between the driving disc (1) and the driven disc (2), each group of connecting components comprises a plurality of first connecting pins (11) which are arranged on the driving disc (1) in the circumferential direction at intervals and a plurality of second connecting pins (21) which are arranged on the driven disc (2) in the circumferential direction at intervals, and the first connecting pins (11) and the second connecting pins (21) are arranged in a staggered mode; the flexible transmission chain (3) is sequentially wound on the first connecting pin (11) and the second connecting pin (21).

2. The low-speed end flexible coupling according to claim 1, wherein the number of the flexible transmission chains (3) is two, the number of the connecting assemblies is two, and one flexible transmission chain (3) is wound on each connecting assembly.

3. The low-speed end flexible coupling according to claim 2, wherein the inner ring cylindrical surface of the driving disc (1) is circumferentially provided with first mounting grooves (12), two ends of each first connecting pin (11) are respectively and fixedly connected to two side walls of the first mounting groove (12), the outer ring cylindrical surface of the driven disc (2) is circumferentially provided with second mounting grooves (22), two ends of each second connecting pin (21) are respectively and fixedly connected to two side walls of the second mounting groove (22), and the flexible transmission chain (3) is sequentially wound on the first connecting pin (11) and the second connecting pin (21).

4. The low-speed end flexible coupling according to claim 2, wherein the driving disc (1) is provided with a plurality of first pin holes in the circumferential direction, the first connecting pins (11) are arranged in the first pin holes in a penetrating manner, and at least one end of each first connecting pin (11) extends out of a preset length along the radial direction of the driving disc (1); a plurality of second pin holes are formed in the driven disc (2) in the circumferential direction, the second connecting pins (21) penetrate through the second pin holes, and at least one ends of the second connecting pins (21) extend out of preset lengths along the radial direction of the driven disc (2); the flexible transmission chain (3) is wound on the first connecting pin (11) and the second connecting pin (21).

5. The low-speed end flexible coupling according to claim 4, characterized in that the two flexible transmission chains (3) are symmetrically arranged on both sides of the first connecting pin (11) and the second connecting pin (21).

6. A low-speed end flexible coupling according to any of claims 1-5, characterized in that the flexible driving chain (3) is made of metal or high-strength wire-drawn fiber.

7. A wind power plant comprising a wind wheel and a speed increaser, characterized in that it further comprises a low-speed end flexible coupling according to any one of claims 1 to 6, wherein the driving disc (1) of the low-speed end flexible coupling is connected with the main bearing (41) of the wind wheel, and the driven disc (2) of the low-speed end flexible coupling is connected with the input shaft (42) of the speed increaser.