Large and middle wind turbine digital intelligent hydraulic brake system

Abstract

The invention discloses a digital, intelligent and hydraulic brake system of large and medium wind machine. The output end of the oil supply system links uniflow valve. Its output end joints to the first accumulator, pressure relay and input end of first plug-in valve through the first throttle valve. The output end of first plug-in valve links the second accumulator. Equip hydraulic cylinders with brake blocks on sucker-rod cavity end, two of which are taken as one group and are located relatively. The sucker-rod cavities of the hydraulic cylinders connect with the output ends of the first and second plug-in valve and the third linking switch valve through the bus. The output end of the second plug-in valve meets oil tank through second throttle valve. Two high-speed switch valves are taken as pilot stage together with two plug-in valves to form digital electro-hydraulic proportional valve. Brake blocks are equipped on both sides of brake chuck of the wind machine to change the open-close time ratio of high-speed switch valves and adjusts hydraulic braking force of the brake chuck. When meeting the working condition of unit braking, adjust the duty ratio of high-speed switch valves in unit time depending on wind speed and main shaft speed to realize intelligent control on braking force.

Description

technical field [0001] The invention relates to a hydraulic brake, in particular to a digital intelligent hydraulic brake system for large and medium-sized wind power generators. Background technique [0002] As the problem of energy shortage becomes more and more serious, green and pollution-free "new energy sources" such as solar energy, wind energy, geothermal energy and ocean currents are getting more and more attention. my country has abundant reserves of wind power resources, and wind turbine manufacturing technology is becoming more and more mature. In order to improve the reliability of the unit, various advanced technologies have been applied to modern wind turbines. Among them, the brake system is one of the key components of the wind turbine. If the design of the mechanical brake system is not reasonable, it will cause disadvantages such as increased mechanical vibration, serious wear of the brake disc, and broken gears, which will bring a lot of inconvenience to ...

AI Technical Summary

Problems solved by technology

[0003] 1. The mechanical vibration is large, because the torque on the main shaft fluctuates greatly during the whole process, and the mechanical parts will also vibrate accordingly, which affects the stability and reliability of the wind turbine

[0004] 2. The gearbox is often overloaded. Because the blades are not continuous and stop when the wind wheel brakes, the dynamic load makes the teeth in the gearbox collide back and forth, causing the teeth to be subjected to bending stress for a long time, and the teeth may break

[0005] 3. Brake pads wear out quickly

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