Wind power generation hydraulic system

Abstract

The invention discloses a wind power generation hydraulic system, which comprises an oil pump, an external oil tank, a spindle brake unit, yawing brake unit and a safe pressure maintaining unit, wherein the oil pump is connected with a spindle brake oil cylinder group through a reducing valve and a first electromagnetic valve, connected with a yawing brake oil cylinder group through a first adjustable throttle, and connected with an energy accumulator through a second adjustable throttle by the same pipeline; the spindle brake oil cylinder group is connected with the external oil tank through a pipeline; the yawing brake oil cylinder group is connected with the external oil tank through a third electromagnetic valve and a first overflow valve by a pipeline; the energy accumulator is connected with the external oil tank through a third overflow valve by a pipeline; and the external oil tank is connected with the yawing brake oil cylinder group through a second overflow valve and the first adjustable throttle by a pipeline. The wind power generation hydraulic system can perform spindle brake and yawing brake, and is provided with the system pressure maintaining device.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a hydraulic system for wind power generation. Background technique [0002] The hydraulic brake of the wind turbine mainly includes the main shaft brake unit and the yaw brake unit. [0003] When the main shaft brake unit and yaw brake unit are braking, the hydraulic system failure is often caused by the hydraulic oil pressure in the hydraulic system pipeline is too high, or the hydraulic oil flow rate of the hydraulic oil to the main shaft brake cylinder is uneven. This results in excessive or insufficient braking force. [0004] When the oil pump fails, the motor needs to be shut down intermittently, or the oil pipeline is cut off, the hydraulic system failure will often be caused by the hydraulic oil pressure in the hydraulic system pipeline being too high, insufficient or unstable, affecting the main shaft brake device and yaw brake device In addit...

AI Technical Summary

Problems solved by technology

[0003] When the main shaft brake unit and yaw brake unit are braking, the hydraulic system failure is often caused by the hydraulic oil pressure in the hydraulic system pipeline is too high, or the hydraulic oil flow rate of the hydraulic oil to the main shaft brake cylinder is uneven. resulting in excessive or insufficient braking force

[0004] When the oil pump fails, the motor needs to be shut down intermittently, or the oil pipeline is cut off, the hydraulic system failure will often be caused by the hydraulic oil pressure in the hydraulic system pipeline being too high, insufficient or unstable, affecting the main shaft brake device and yaw brake device In addition, during the maintenance process, the pressure in the pipeline is often reduced due to the loss of hydraulic oil in the hydraulic system, which makes the main shaft brake device and yaw brake device unable to work normally.

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