FLUID ACTUATOR FOR APPLICATION INSIDE TURBOMACHINERY

摘要

PROBLEM TO BE SOLVED: To improve an actuator including a cylinder having an input port, a piston disposed inside the cylinder, and a piston ring disposed in a piston ring groove.

SOLUTION: In the actuator, the piston 12 includes a spring 22, and the spring 22 is inserted into the circumferential piston ring groove 16 adjacent to the piston ring 20 and a high pressure side 42 of the piston ring 20. The spring 22 preloads the piston ring 20 to seal between a low pressure face 24 of the piston ring 20 and a low pressure face 24 of the circumferential piston ring groove 16. The invention also includes a method for moving an adjustable seal in a radial direction using the piston-ring sealed actuator. The method includes moving of the adjustable seal in an axial direction, and breaking of a primary axial contact between the adjustable seal and a primary sealing face.

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