Improved efficiency of tumble dryers has developed because of increased attention to environmental pollution. The efficiency of a dryer is determined by an "energy factor" coefficient which measures the Kg of clothing per Kilowatt-hour of electricity. The operating concept consists of a rotating drum (50/100 rpm) with a heated air flow moving over clothes. The two types of dryer provide energy in different ways:
- electric dryers have heating elements
- gas dryers use a gas burner
Both types of Dryers are subject to requirements of silent running and high efficiency with an expectation of long service life. A small electric motor (commonly a single-phase induction motor) drives a drum while a ventilating fan provides the hot air through the clothes.
A complete solution
SKF can provide bearings for the small electric motor shaft drum support and fan shaft.
Single row deep groove ball bearings for electric motors in dryers
Two deep groove ball bearings are mounted to support the motor shaft
Single row deep groove ball bearings for tumble dryer drums
The deep groove ball bearings for this application are commonly supplied with metal shields
Bushings for ventilating fans
The fan is usually driven by an electric motor which also drives the drum