Inside all vacuum cleaners is a high-speed fan.?

Question

Explain how this fan causes dirt to be picked up by the vacuum cleaner.

Answer 1

There's a rotating brush called the beater that lifts dirt and such from the floor and throws into the wind (suction) caused by the fan which carries it to a place where it gets collected..

Answer 2

The "fan" in a vacuum cleaner is more like an air pump. A fan just pushes against the nearby air, moving it around the room. In an air pump or air compressor, the blades are enclosed so that at least a partial seal forms around it and the air is pulled into a chamber. The collection chamber of the vacuum cleaner leaks air, otherwise it WOULD be a compressor, and not a very good cleaner.

The vacuum cleaner also requires leakage around the suction head. If it sealed perfectly to the floor, it couldn't pick up anything. You may have noticed when the vacuum cleaner gets clogged, its motor speed increases. This is NOT because it's "working harder". It's actually working less because no air is being moved. Backpressure just keeps the pockets of air between the blades of the pump going around and around instead of forward, so there is less work to do. Unclogging unbalances the pressure and the motor goes back to pushing air (and dirt) from outside to inside.

Answer 3

Use a piece of tissue paper to convince yourself that any fan that produces pressure on one side also produces a slight vacuum on the other side. It will try to suck the tissue into the fan blades.

The blower in a vacuum cleaner creates a somewhat stronger suction, and it can suck in dust and light debris through the tube from the brush. There is a catch bag between the tube and the blower, and the dust and debris is deposited there, while the air flows through the porous bag and out through the fan.

In some vacuum cleaners, the blower is between the pickup brush and the bag, and the dust and debris actually passes through the blower and out into the bag.