Yaw brake hydraulic system for pressure loss prevention of wind turbine generator

Abstract

A yaw brake hydraulic system for pressure loss prevention of a wind turbine generator comprises an oil tank 1, an oil pump 4, oil filters (27 and 29), a pressure switch 8, a one-way throttle valve 9, solenoid valves (21 and 22), energy storages (11 and 25), overflow valves (5 and 18), check valves (6 and 20), a motor 3, a liquidometer 28, a temperature controlled switch 19 and the like which are combined, and is characterized in that the energy storage 25 is directly in parallel connection with the outlet of the solenoid valve 21, a low-pressure oil source system is not provided; and when a host gives out a yaw order, the solenoid valve 21 reverses, and a brake cylinder and the energy storage 25 are communicated with the overflow valve 18, so that pressure in the brake cylinder and the energy storage 25 is immediately reduced to the set pressure of the overflow valve 18 to provide a damping pressure source for the brake cylinder. The invention is not provided with the low-pressure oil source system, so that when the host runs to generate, the energy storage 25 is always in parallel connection with the brake cylinder and is in a high pressure state, and an additional leakage passage is not arranged, when cabin brake is removed, a high-pressure brake system loses pressure instantly. The invention is also not provided with solenoid valves which are charged for a long time and interlocked.

Description

1. Technical field: [0001] The invention relates to a pressure loss preventing yaw brake hydraulic system for a wind power generating set. Two, background technology: [0002] In order to change the energy structure of human beings, wind power technology is developing rapidly. With the development of this technology, in order to improve the power generation efficiency of wind turbines, hydraulic transmission and control systems have been widely used in the control of blade yaw. [0003] In the existing impeller yaw control, it is mainly to ensure the stable braking of the nacelle when the wind turbine is working, and the damping force when the impeller yaw rotates against the positive wind direction to ensure the stable movement of the nacelle. [0004] To this end, people have adopted dual accumulators and dual pressure control loops to meet their use requirements. In the current hydraulic system of this kind, two electromagnetic control valves are provided to ensure the ...

AI Technical Summary

Problems solved by technology

In this way, when the yaw system of the main system is braking, when the low-pressure accumulator needs to replenish pressure oil due to leakage, the high-pressure braking system will lose pressure instantaneously, causing the braking force of the brake cylinder to decrease instantaneously, and the stability of the engine room will be lost. verb: move

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