Analysis of the hydraulic system of the wind turbine
Published:2013年04月17日 Source:未知 Click:次
The drive mechanism of the hydraulic system of the wind turbine is actually the braking system, the main task to perform the start and stopof the wind turbine. It usually consists of two pressure sustaining loop:all the way through the accumulator supply impeller brake system; waythe the yaw brake system supplied by the accumulator. The tasks ofthese two loops so that when the normal operation of the WTG the fanbrake system always to keep a certain pressure. When the pressure sensor measured pressure value is less than the system settings, PLCcontrol hydraulic station motor starts to compensate for the loss ofpressure, the pressure value is always above the set value.
The actual working pressure of the hydraulic system is always in a state of change, mainly due to leaks in the system, the action of the oil temperature and solenoid valve and the oil problem. The theoreticalhydraulic components are not within the vent, but in fact ventcomponents can not be ignored. The higher the oil temperature the more dilute the oil, the more serious the lower the pressure within the vent. Contamination of the hydraulic oil is mixed with the air, water anda variety of cured product from the outside, the mixed use, such ascorrosion of the metal powder, crushed substance destruction of thesealing materials, coatings, etc.. Oil pollution would aggravate the wearof hydraulic components in the relative motion between the parts, thethrottle holes caused by the blockage or the amplitude of movement ofthe slide valve stuck, hydraulic components does not work. The smallfluid compressibility used in the hydraulic system oil is incompressible,in normal circumstances can be considered. However, the compressibility of air, a million times about oil, so even if the systemcontains a small amount of air, its influence is great, dissolved in the oil in the air, at low pressure from the oil fluid escaping bubbles, formedcavity phenomenon, to the high-pressure zone, these bubbles is quicklybeing crushed under the action of pressure oil, sharp subjected to compression, so that the noise generated in the system, at the same time is compressed in the gas suddenly will release lot of heat, causinglocal overheating, accelerated temperature rise, hydraulic components and hydraulic oil damage. The compressibility of air, also lead to organfailure such as crawling, undermine the smooth work.
The actual working pressure of the hydraulic system is always in a state of change, mainly due to leaks in the system, the action of the oil temperature and solenoid valve and the oil problem. The theoreticalhydraulic components are not within the vent, but in fact ventcomponents can not be ignored. The higher the oil temperature the more dilute the oil, the more serious the lower the pressure within the vent. Contamination of the hydraulic oil is mixed with the air, water anda variety of cured product from the outside, the mixed use, such ascorrosion of the metal powder, crushed substance destruction of thesealing materials, coatings, etc.. Oil pollution would aggravate the wearof hydraulic components in the relative motion between the parts, thethrottle holes caused by the blockage or the amplitude of movement ofthe slide valve stuck, hydraulic components does not work. The smallfluid compressibility used in the hydraulic system oil is incompressible,in normal circumstances can be considered. However, the compressibility of air, a million times about oil, so even if the systemcontains a small amount of air, its influence is great, dissolved in the oil in the air, at low pressure from the oil fluid escaping bubbles, formedcavity phenomenon, to the high-pressure zone, these bubbles is quicklybeing crushed under the action of pressure oil, sharp subjected to compression, so that the noise generated in the system, at the same time is compressed in the gas suddenly will release lot of heat, causinglocal overheating, accelerated temperature rise, hydraulic components and hydraulic oil damage. The compressibility of air, also lead to organfailure such as crawling, undermine the smooth work.
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