DEVICE FOR AXIAL COMPRESSION OF TRANSFORMER WINDINGS Russian patent published in 1996 - IPC

FIELD: power engineering; electrical engineering; transformer manufacture. SUBSTANCE: device has hydraulic power cylinder with piston and pipe union for feeding hydraulic cylinder with fluid agent; hydraulic cylinder has helical groove over entire length of its inner surface. Device also has two ratchet gears with springs and dogs, and short stud installed in through hole of piston. Outer surface of piston has helical ridge. Mentioned grooves and ridge form helical-and-hydraulic pair, the so-called hydraulic-cylinder-piston pair. Teeth of first ratchet gear are located on outer diameter of piston ridge, and piston spring with dog is provided in lower end of hydraulic-cylinder groove. Short stud has its upper part made in the form of other piston installed and sealed in axial hole of hydraulic-cylinder piston; its lower threaded part is joined with thread provided on bottom part of through hole walls in hydraulic- cylinder piston. Bottom end of short stud has spherical surface and is provided with dowel pins. Spring with dog of second ratchet gear is installed on hydraulic-cylinder piston at lower end of its internal thread groove; teeth of second ratchet gear are made on lower turns of thread ridge on short stud and their quantity is the same as that of first ratchet gear teeth. Inner walls of through axial hole in hydraulic-cylinder piston are threaded in opposite direction relative to helical-and-hydraulic pair. EFFECT: increased compression stroke at same overall dimensions as those of prototype. 5 cl, 3 dwg