PITCH DRIVE DEVICE FOR WIND TURBINE ROTOR BLADES AND WIND POWER GENERATING DEVICE EQUIPPED WITH SAME

WIPO Patent Application WO/2013/035194

A1

In order to contribute to cost and environmental preservation by preventing a hydraulic pump from taking in air and being contaminated by oil and by reducing the use amount of the oil, a pitch drive device according to the present invention comprises: hydraulic actuators (15) for changing the pitch angles of wind turbine blades (5); a hydraulic pump (22) for supplying oil to the hydraulic actuator (15); a high-pressure oil line (24) for guiding the oil discharged from the hydraulic pump (22) to the hydraulic actuators (15); a low-pressure oil line (25) for returning the oil discharged from the hydraulic actuator (15) to the hydraulic pump (22); and a pressure control device (26) for retaining a surplus amount of the oil and refilling the low-pressure oil line (25) with the oil so as not to generate negative pressure in an oil intake portion of the hydraulic pump (22). The hydraulic actuator (15), the hydraulic pump (22), the high-pressure oil line (24), the low-pressure oil line (25), and the pressure control device (26) constitute a closed hydraulic pump (32) that does not open to the atmosphere and is filled with the oil.

WO/1994/025752	WIND TURBINE WITH PROTECTION AGAINST LIGHTNING
WO/2008/113699	ENERGY CONVERSION DEVICE WITH HYDRAULIC DRIVE
WO/2012/028145	A WIND TURBINE HAVING A HEAT TRANSFER SYSTEM

NUMAJIRI TOMOHIRO (JP)

PCT/JP2011/070594

March 14, 2013

September 09, 2011

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MITSUBISHI HEAVY IND LTD (JP)
NUMAJIRI TOMOHIRO (JP)

F03D11/00

JP2002276535A	2002-09-25
JPH0742663A	1995-02-10
JPS62184206A	1987-08-12
JPS5591773A	1980-07-11
JP2002276526A	2002-09-25

FUJITA, Takaharu et al. (JP)
Takaharu Fujita (JP)

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