Vacuum cleaner has air throughput regulator upstream of electric motor that changes air passage area in range between 80 and 100 per cent of maximum throughput

摘要

The vacuum cleaner has a frame holding an electric motor with an associated fan providing suction between a connector upstream of the motor ending in a suction device to a downstream air outlet, a pref.. upstream filter and an air throughput regulator upstream of the motor that changes the air passage area in a range between 80 and 100 per cent of the maximum throughput.