CN214742856U

CN214742856U - Coupling for wind generating set

Info

Publication number: CN214742856U
Application number: CN202120848607.0U
Authority: CN
Inventors: 崔新维; 何家志; 崔逸南
Original assignee: Beijing Sanli Xinneng Science & Technology Co ltd
Current assignee: Beijing Sanli Xinneng Science & Technology Co ltd
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2021-11-16
Anticipated expiration: 2031-04-23

Abstract

The utility model discloses a shaft coupling for wind generating set, including input half-coupling (pass through the spline hookup with the input shaft), output half-coupling (constitute by the brake disc mid portion and with the hookup of output shaft bolt) and couple a plurality of nylon pin and ordinary bolt of two half-couplings of hookup. The spline connection can provide dynamic compensation for axial, radial and angular displacements of the input shaft in the operation process; the epitaxial structure of the output end half coupling can be used as a brake disc; the nylon pin and the connecting bolt are designed and selected based on a transmission torque threshold value, and after the load torque of the output shaft exceeds the threshold value, the connection of the nylon pin and the connecting bolt is broken and fails, so that the connection of the coupler is disconnected, and the safety protection effect is achieved. The coupler is simple in structure, complex in function and low in cost, achieves four functions of normal torque transmission, comprehensive displacement compensation of the input shaft, maintenance braking and safety protection, and is convenient to install and maintain.

Description

Coupling for wind generating set

Technical Field

The patent of the utility model relates to a shaft coupling for wind generating set belongs to wind power generation technical field.

Background

Wind power is a power generation mode with the greatest large-scale development value and commercial development prospect in the field of renewable energy sources, and available wind energy is widely distributed and has huge reserves in the global scope.

The transmission system of the wind driven generator is a core component of the wind turbine generator, and the whole manufacturer usually adopts the following scheme when integrating the system: the main shaft, the gear box and the generator are independently designed and provided by different part suppliers, a coupling is arranged on a high-speed shaft of a transmission system, and an output shaft of the gear box is connected with a rotating shaft of the medium-high speed generator.

The function of the coupling is mainly as follows: 1) the torque in the high-speed shaft or the low-speed shaft of the transmission system is effectively transmitted; 2) the axial, radial and angular displacement between the output shaft of the gear box and the rotating shaft of the generator is dynamically compensated; 3) when a load end (namely an output end of a generator, which is usually connected with a power grid directly or through a converter) of the wind turbine generator fails, the torque borne by mechanical parts of a transmission system is ensured to be within a design range, key parts such as a gear box and the like are prevented from being damaged, and the time for stopping and disconnecting the wind turbine due to faults is delayed.

The existing common coupler adopts a scheme of two half couplers, each half coupler is connected with the output end or the input end of a part in a transmission system by utilizing an expansion sleeve or a spline, a friction plate type torque limiting device is added between the two half couplers and then connected by using a bolt, and the effect of transmitting torque and limiting torque is realized by pre-tightening an adjusting bolt. The applications of patents CN 205036515U, CN 103375498B, CN 208380755U and CN 201284799Y are based on the above solutions. There are three disadvantages to this approach: 1) the output end or the input end of each part needs to use a half coupling, so that the cost of the transmission system is increased; 2) the torque limit threshold value cannot be accurately set, certain errors exist, and when the input load of the impeller fluctuates greatly, the torque transmission during normal power generation can be influenced by excessively conservative setting; 3) the effect of friction torque limitation is compromised after slippage occurs, increasing risk.

Disclosure of Invention

A shaft coupling for a wind generating set comprises an input end half coupling, a shaft sleeve and a shaft sleeve, wherein the input end half coupling is connected with an input shaft through a spline; the output end half coupling is formed by the middle part of the brake disc and is connected with the output shaft through a bolt; the nylon pin and the bolt are connected with the input end half coupling and the output end half coupling.

The output shaft is a rotating shaft of the generator, the inner diameter of the output shaft is larger than the outer diameter of the input shaft, and the output shaft surrounds the input shaft inside. At least one group of bearings and bearing seats are arranged in the generator or on the end cover to support the input shaft to rotate in the output shaft. The input shaft and the half coupling, the output shaft and the middle part of the brake disc, the connection of the input end half coupling and the output end half coupling are both positioned at the tail part of the generator, and the rear end cover of the generator can be directly installed and maintained after being disassembled. The input end half coupling and the output end half coupling are connected in a rigid mode, and the input shaft and the half couplings provide dynamic compensation for axial displacement, radial displacement and angular displacement of the input shaft in the running process.

The input end half coupling is connected with the output end half coupling through bolts, or the output end half coupling is connected with the output shaft through bolts, or the middle part of the brake disc is added with an insulating material, so that the input shaft and the output shaft are electrically insulated.

The nylon pin and the bolt are designed and selected according to a transmission torque threshold value, after the load torque of the output shaft exceeds the threshold value, the nylon pin and the bolt are broken and lose efficacy, and the input end half coupling and the output end half coupling are disconnected.

The utility model has the advantages that: the utility model provides a compound coupling for the transmission system of a wind turbine. The structure realizes four functions of normal torque transmission, comprehensive displacement compensation of an output shaft, maintenance braking and safety protection by utilizing the connection of a brake disc of the generator and the spline coupler. Meanwhile, a traditional friction type torque limiting device is abandoned, and the effect of safety protection is achieved through the self bearing capacity of the nylon pin and the bolt. The whole structure is simple, the functions are complex, the cost is low, and the installation and the maintenance are convenient.

Drawings

FIG. 1 is a schematic view of a coupling for a wind turbine generator system

Description of the drawings: 1-input shaft half coupling, 2-output shaft half coupling, 3-nylon pin, 4-bolt, 5-input shaft, 6-flange surface, 7-brake disc, 8-output shaft, 9-generator front end cover, 10-bearing, 11-bearing seat and 12-generator rear end cover.

It is noted that the above-described figures are intended to illustrate the features of the invention and are not intended to show any actual structure or to reflect the details of the dimensions, relative proportions, etc. of the various components. In order to more clearly demonstrate the principles of the present invention and to avoid obscuring the same in unnecessary detail, the examples in the figures have been simplified. These illustrations do not present an inconvenience to those skilled in the relevant art in understanding the present invention, and the actual coupling may include more components.

Detailed Description

For making the purpose and technical solution of the embodiments of the present invention clearer, the following description is combined with the relevant drawings of the embodiments of the present invention to perform a complete description of the embodiments of the present invention. This patent describes some, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the coupling for the wind turbine generator system includes an input shaft coupling half 1, an output shaft coupling half 2, a nylon pin 3, and a bolt 4. The input shaft 5 can be a gearbox high-speed shaft, and is connected with the input shaft half-coupling 1 through a spline to form a flange surface 6 of the input shaft 5. The brake disk 7 is coupled in its middle part to the output shaft 8 in a manner that may be bolted. In the middle part of the brake disc 7 a number of bolt holes have been reserved, which bolt holes need to be brought into engagement with the input coupling part 1. The nylon pin 3 has the function of connecting the two half couplings and transmitting torque, and the bolt 4 realizes the axial fixation of the two half couplings.

The output shaft 8 is a generator rotating shaft, has an inner diameter larger than the outer diameter of the input shaft 5, and surrounds the input shaft 5 therein. At least one set of bearings 10 and bearing seats 11 are arranged on the front end cover 9 of the generator to support the input shaft 5 to rotate in the output shaft 8.

The input shaft 5 extends as a high speed shaft of the gearbox up to the generator tail. Therefore, the connection between the input shaft 5 and the input shaft half-coupling 1, the connection between the output shaft 8 and the brake disc 7, the connection between the input end half-coupling 1 and the output end half-coupling 2 are both positioned at the tail part of the generator, and the rear end cover 12 of the generator can be directly installed and maintained after being disassembled. The coupling of the two coupling halves is a rigid coupling and the coupling of the input shaft 5 to the input coupling half 1 is a rigid movable coupling, which provides dynamic compensation for axial, radial and angular displacements of the input shaft 5 that occur during operation.

The bolt connection of the input end half coupling 1 and the output end half coupling 2, or the bolt connection of the output end half coupling 2 and the output shaft 8, or the middle part of the brake disc 7 is added with an insulating material, so that the electrical insulation of the input shaft 5 and the output shaft 8 is formed.

The nylon pin 3 and the bolt 4 are designed and selected according to a transmission torque threshold value, after the load torque of the output shaft 8 exceeds the threshold value, the nylon pin 3 and the bolt 4 are broken and lose efficacy, and the input end half-coupling 1 and the output end half-coupling 2 are disconnected.

Claims

1. The utility model provides a shaft coupling for wind generating set which characterized by: the coupler comprises an input end half coupler which is connected with the input shaft through a spline; the output end half coupling is formed by the middle part of the brake disc and is connected with the output shaft through a bolt; the nylon pin and the bolt are connected with the input end half coupling and the output end half coupling.

2. The coupling for a wind generating set according to claim 1, wherein: the output shaft has an inner diameter larger than an outer diameter of the input shaft and surrounds the input shaft therein.

3. The coupling for a wind generating set according to claim 1, wherein: the output shaft is a generator rotating shaft, and at least one group of bearings and bearing seats are arranged in the generator or on an end cover to support the input shaft to rotate in the generator rotating shaft.

4. The coupling for a wind generating set according to claim 1, wherein: the input shaft and the input end half-coupling, the output shaft and the middle part of the brake disc, the connection of the input end half-coupling and the output end half-coupling are both positioned at the tail part of the generator, and the rear end cover of the generator can be directly installed and maintained after being disassembled.

5. The coupling for a wind generating set according to claim 1, wherein: the input end half coupling and the output end half coupling are connected in a rigid mode, and the input shaft and the input end half coupling are connected to provide dynamic compensation for axial displacement, radial displacement and angular displacement of the input shaft in the running process.

6. The coupling for a wind generating set according to claim 1, wherein: the input end half coupling is connected with the output end half coupling through bolts, or the output end half coupling is connected with the output shaft through bolts, or the middle part of the brake disc is added with an insulating material, so that the input shaft and the output shaft are electrically insulated.

7. The coupling for a wind generating set according to claim 1, wherein: the nylon pin and the bolt are designed and selected according to a transmission torque threshold value, after the load torque of the output shaft exceeds the threshold value, the nylon pin and the bolt are broken and lose efficacy, and the input end half coupling and the output end half coupling are disconnected.