STUDIO DEL TRANSITORIO NELLA TRASMISSIONE DALLA P.D.P. AL VENTILATORE DI UN NEBULIZZATORE

During the use of a number of mistblowers for the orchard and vineyard protection, the overgear-box, located between the p.t.o. and the centrifugal fan, was damaged. To solve the problem we carried-out a dynamic analysis of initial no steady-state by integrating the differential equation of the impeller motion. By the obtained equations, a numerical experimentation was carried-out. It showed the gearing of a power greater than design power of the overgear box, due to impeller inertia. This result explains the overgear box damages and gave the no steady-state condition time (1,8 s), to get the rated velocity of the impeller. Finally a torque limiter assembling, between the p.t.o. and the overgear box, was proposed. A new differential equation solution and a new numerical experimentation was carried-out. It showed a reduction of the geared power to the rated value of the overgearbox, together with an increase of the no steady-state condition time to 8,7 s.