In the first part, we talked about how vacuum cleaners have become an essential part of our home and the mechanism they are built on. We also saw that the suction inside the vacuum cleaner is created by the pressure drop which the difference in air pressure behind and in front of the fan. When the outside pressure is greater than the pressure behind the fan, suction is created which allows stream of air to move through the intake port and out the exhaust port.
If you missed part 1, use this link to start from there.
In the section, we will be looking into the friction mechanism which allows that flowing stream of air to collect hair, debris and other dust particles from carpets. It should be noted that moving air will come in contact with all loose material on the carpet and if the suction is strong enough the air will carry the dust or debris into the vacuum cleaner. This is similar to a stream of water carrying away light materials such as leaves, bags and plastic.
Vacuum cleaner bags
Some latest vacuum cleaner designs incorporate moving brushes at the head, kicking dust particle from the carpet so it is easier to carry them inside by flowing air. The air filled with dirt, dust, hair and fur then passed through the filter bag and out of the exhaust port. The purpose of the vacuum cleaner bag is to collect all dust particles to ensure only clean air is flowing out of the machine.
These bags are usually made from porous woven, performing tasks of a filter. The holes in vacuum cleaner bags are large enough for air particles too move out comfortably but too small for tiny dust particles. Therefore, when the dirt filled air comes into the vacuum cleaner bag, only the dust particles stay in while fresher air flows out through the exhaust port.
It is possible to place the filter bag anywhere between the exhaust port and the intake tube.
Position of Filter Bags
However, it is recommended to make sure the air current flows freely through it. If you are using a vertical vacuum cleaner then the filter bag is likely to be positioned at the last stop on the path. The bags are typically placed just before the fan blades in canister vacuums as this filters the air as soon as it gets into the vacuum. Based on this idea, manufacturers design different vacuum cleaners with a variety of suction capacities.
Determining the suction power
Now we will be looking at the factors that determine the suction power of a vacuum cleaner. Following are the factors that control the suction power:
The power of the fan:
The stronger or powerful the motor is, the better will be the suction power. Small vacuum cleaners with small motors, therefore, have limited suction power. Power of a motor can be defined as the speed at which the motor has to turn.
The blockage of the air passageway:
If the air passageway is blocked by dust particles, debris, hair or fur then the suction power is likely to be reduced due to increased air resistance.