A flexible braking hydraulic cylinder for a wind power generating set

Abstract

The invention discloses a flexible brake hydraulic cylinder of a wind generating set. The flexible brake hydraulic cylinder mainly comprises a hydraulic cylinder body, a main piston, a buffer piston,a pressure valve and a buffer spring assembly. The pressure valve is mounted on the buffer piston. The buffer piston is mounted in a cylindrical cavity in the center of the top end face of the main piston. The main piston is mounted on the hydraulic cylinder body. The buffer spring assembly is arranged between the buffer piston and the main piston. When a fan needs main shaft braking, the buffer piston compresses the buffer spring assembly under the action of hydraulic pressure, the hydraulic pressure is achieved by stages in the braking process, the problem about rigid braking of a main shaftof the wind generating set is solved, the flexible braking function of the wind generating set is achieved, and it is guaranteed that the wind generating set operates safely and stably. In addition,the flexible brake hydraulic cylinder is compact in structure, the mechanical connection manner and the electrical control manner of an existing main shaft brake are not changed, the use requirement of the wind generating set is met, and existing equipment can be upgraded and rebuilt conveniently.

Description

technical field [0001] The invention relates to the technical field of wind power generation braking, in particular to a flexible braking hydraulic cylinder of a wind power generating set. Background technique [0002] Main shaft brake is an important safety device for wind turbines. When the wind turbine is running normally, the brake of the main shaft is released, and the main shaft and the brake disc rotate; when the wind turbine encounters an emergency or needs to be shut down for maintenance, the brake of the main shaft brakes, and the main shaft and the brake disc stop rotating. As the power of wind turbines continues to increase, the braking capacity of the main shaft brakes is also increasing. At present, large wind turbines generally use hydraulic disc brakes. The hydraulic pressure suddenly loads on the brake disc at the beginning of braking. When the main shaft rotates at a high speed, the brake will easily cause damage to the main shaft and its transmission chai...

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Problems solved by technology

[0004] In response to the above problems, the researchers proposed a magnetothixotropic flexible brake device for wind turbines and wind turbines. This device avoids the vibration and shock of the gearbox caused by the rigid contact braking of traditional mechanical brakes and the damage to the gear teeth. , which effectively improves the life of the gearbox and reduces the operating cost of the wind turbine. However, this device is a brand new device. The interface is completely different from the hydraulic braking device widely used in the current wind turbines. It is not suitable for the existing wind turbines. carry out renovation

A braking device and braking method for a wind power generating set is also proposed, including auxiliary devices, pressure handles, brake shoes, etc. The mechanical braking method can realize gentle braking of the wind generating set and avoid breakage of the fan shaft. The disadvantage is that the mechanical interface cannot Meet the requirements of current wind turbines

A flexible braking device for wind power generators is also proposed, which uses magnetotropic rubber as the working medium, and realizes dual-mode braking torque adjustment by adjusting the control current and the plane angle position of the blade assembly. The effect of increasing the braking torque, the disadvantage is that the mechanical interface cannot meet the current requirements for the use of wind turbines

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