UNIVERSAL, HIGH-TORQUE, MULTI-TURN ELECTRIC DRIVE FOR SHUT-OFF VALVES USED IN PIPELINE TRANSPORT

摘要

The present invention relates to engineering industry and can be applied to any industrial machinery-in particular, to valves of pipelines for liquid and gaseous media transportation. A valve electric drive contains: an electric motor and a cased planetary gearbox comprising an input shaft, a planet, a supporting central gear and a two-bearing output shaft with an output central gear. The gearbox is two-stage and monoplanetary, that's why it has a two-bearing planetary carrier and a number of planets equal to the odd number of planets on each stage, which are mounted in pairs inside the carrier. At the same time, rotation axes of the rotor, the carrier, and the input and output shafts are mutually coaxial and coincide with the movement axis of the valve spindle shaft. The rotor is firmly fastened to an input extension of the input shaft and is clasped with the stator, which is fastened to the case collar. The input and output shafts and the planetary carrier are hollow, with holes for spindle shaft and gearbox moving parts placed inside to move freely. Total numbers of teeth for central gear on both planetary stages are equal: z a 1 + z b 1 = z a 2 + z b 2 = z £ , and are taken from the 200 < z £ < 400 range. Numbers of teeth for the second-stage central gears are taken from parameter series z a 2 = 80, 81, ...,150 and z b 2 =120,121, ..., 250 , so that neither z a 2 / a c 2 , nor z b 2 / a c 2 are integer, while z £ / a c 2 = z £ la c 1 is integer. Numbers of teeth for the first-stage central gears and for planets on both stages are set according to the formulas: z a 1 = z a 2 + ” z , z b 1 = z b 2 - ” z , z g 2 = 0,5( z b 2 - z a 2 ) and z g 1 = z g 2 - ” z , where ”z=z a 1 -Z a 2 =z b 2 -z b 1 = z g 2 - z g 12 =1, 2,...,10 is defined as ” �¢ z = z b 2 �¢ u a 12 �¢ b 2 b 1 - 1 , where u a 12 �¢ b 2 b 1 is the amount of the reproducible gear ratio.