DO YOU WONDER HOW ROTARY PADDLE VACUUM DRYERS (RPVD) WORK?

Generally the Rotary paddle horizontal dryer is constructed as a jacketed horizontal cylinder with two heads provided with an outside jacket. Nozzles, for product feeding and discharge, for the bag filter, nitrogen inlet, bursting disc is provided. A heated horizontal shaft with radial paddles which scrape the wall, performs the mixing operation and supplies the majority of the total heat flux when compared to the heated outside vessel walls.

This is due to the design of the shaft and the agitator blades, which allow the forced circulation of the heating fluid; the design and working conditions, are the same as for the outside jacket system. The rotating agitator blades prevent deposits, which would reduce the total heat-exchange in a short period of time. The scraping blades are designed and installed to facilitate the discharge of the dried product through the product discharge nozzle. This is achieved by reversing rotation. The shaft sealing can be either by a stuffing-box or a mechanical seal.

The agitator drive consists of a gearbox coupled to a reversible/variable speed motor. The heating fluid inside the agitator both enters and exits the system through a rotating joint. A discharge plug valve is normally installed in the central part of the vessel and is activated by a pneumatic piston. A jacketed dust filter can be installed with a reverse jet cleaning system. The dryer capacity normally ranges from a few liters to approximately 20,000 liters. In some cases, the shaft is supported on only one side to allow the opening of the opposite head for cleaning and inspection. The design of the paddles provides for self-cleaning of the cylindrical body and heads all surfaces are consistent with GMP norms.

The gearboxes serve as a driving heart for this equipment and have major impact on performance of the equipment. Use of planetary gearbox or planetary geared motor due to its added advantage enhances the performance of the equipment. To obtain product of high quality after drying, gearboxes from reputed gearbox manufacturers in India such as, Top Gear Transmissions has to be used

Hence for the dryer to perform the necessary functions with a better and more efficient operation use of specially designed series of planetary & Planetary Helical gearboxes from the Top Gears Make is highly recommended.