US 12,435,698 B2
Seal assembly for a rod of a pitch actuator of a wind turbine, and pitch actuator of a wind turbine
Jimmi Wenderby, Vraa (DK)
Assigned to DELLNER HYDRATECH GROUP, Vraa (DK)
Appl. No. 18/711,103
Filed by DELLNER HYDRATECH GROUP, Vraa (DK)
PCT Filed Nov. 19, 2021, PCT No. PCT/IB2021/060737
§ 371(c)(1), (2) Date May 16, 2024,
PCT Pub. No. WO2023/089365, PCT Pub. Date May 25, 2023.
Prior Publication US 2025/0020102 A1, Jan. 16, 2025
Int. Cl. F03D 7/02 (2006.01); F15B 15/14 (2006.01); F15B 21/00 (2006.01); F16J 15/00 (2006.01)
CPC F03D 7/0224 (2013.01) [F15B 15/1433 (2013.01); F15B 15/1461 (2013.01); F15B 21/003 (2013.01); F16J 15/002 (2013.01); F05B 2240/57 (2013.01); F05B 2260/79 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A blade pitch actuator for a wind turbine, comprising:
a cylinder;
an actuator rod movably disposed in the cylinder, the actuator rod being structured to reciprocate within the cylinder to adjust a pitch angle of a blade of the wind turbine;
a cylinder cover enclosing an open end of the cylinder; and
a seal assembly, comprising:
at least one first ring annularly interposed between the actuator rod and the cylinder cover, wherein the at least one first ring is removably supported by a first split retainer half pair in an annular recess defined in the cylinder cover,
a first seal annularly interposed between the actuator rod and the cylinder cover, wherein the first seal is removably disposed adjacent to the first split retainer half pair in the annular recess,
a second seal annularly interposed between the actuator rod and the cylinder cover, the second seal being removably supported by a retainer in the annular recess, wherein, the second seal is axially spaced from the first seal by a second split retainer half pair accommodated in the annular recess, and
a wiper seal annularly interposed between the actuator rod and the cylinder cover, the wiper seal being removably supported by a third split retainer half pair detachably secured to a sleeve portion of the cylinder cover,
wherein, each of the first split retainer half pair, the second split retainer half pair, and the retainer is removably connectable to an end portion of the annular recess in the cylinder cover.