Views: 4 Author: Site Editor Publish Time: 2019-04-30 Origin: Site
When you drink soda through a straw, you use the simplest suction mechanism.Pulling the soda up causes a pressure drop between the bottom and top of the straw.Since the fluid pressure at the bottom is higher than at the top, the soda is pushed into your mouth.
This is the same basic mechanism that works in a vacuum cleaner, although it is a bit complicated to execute.In this article, we'll take a look inside the vacuum cleaner and see how it makes the vacuum cleaner work in cleaning up dust and debris in your house.As we shall see, the design of a standard vacuum cleaner is very simple, but it relies on many physical principles to clean efficiently.
It may look like a complicated machine, but a traditional vacuum cleaner actually consists of only six basic components:
Air intake, which may include various cleaning accessories
An electric motor
A case that contains all the other parts
When you plug in the vacuum cleaner and turn it on, this is what happens:
Current drive motor.The engine is connected to a fan, which has sloping blades (like the propellers of an airplane).
As the fan blades turn, they force the air forward, toward the vent (see how the plane works, find out why).
As the air particles are pushed forward, their density (and therefore air pressure) increases in front of the fan and decreases behind it.
The pressure drop behind the fan is like the pressure drop in the straw when you drink your drink.The pressure level in the area behind the fan is lower than that outside the vacuum cleaner (ambient air pressure).This creates suction, part of the vacuum inside the vacuum cleaner.
Ambient air pushes itself into the vacuum cleaner through the intake, because the air pressure inside the vacuum cleaner is lower than that outside.
As long as the fan is running and the passage through the vacuum cleaner remains clear, there will be a continuous flow of air from the inlet to the exhaust.But how does the air flow collect dust and debris from the carpet?
The key principle is friction.
Moving air particles rub against any loose dust or debris as they move, and if the debris is light enough and the suction strong enough, the friction will carry the material into the inside of the vacuum cleaner.This is the same principle that causes leaves and other debris to flow down the river.Some vacuums also have rotating brushes at their intakes that blow away dust and dirt from the carpet, allowing the air to carry it away.
When dusty air enters the vent, it passes through the bag of the vacuum cleaner.The bags are made of a porous woven material (usually cloth or paper) that ACTS as an air filter.The holes in the bags are large enough to allow air particles to pass through, but too small for most dust particles.So when air flows into the bag, all the air flows through the material, but dust and debris collect in the bag.
You can place the bag anywhere between the intake and exhaust as long as there is air flowing through it.In an upright vacuum, the bag is usually the last stop on the road: after being filtered, the air immediately flows back outside.In the canning vacuum, the bag can be placed in front of the fan so that the air will be filtered out as soon as it enters the vacuum.