The powerful vacuum cleaner has become a necessary tool for cleaning, and many people can use it. Now let me introduce the structure and principle of it.Vacuum cleaners may seem complicated, but traditional vacuum cleaners actually consist of only six basic parts:
An air inlet may contain several cleaning accessories, an air outlet, an electric motor, a fan, a porous dust bag, and a housing that can accommodate all other components.
Plug in the vacuum cleaner and turn on the switch. The following happens:
The current controls the operation of the motor.A fan is attached to the motor, and the fan blade has a certain Angle, just like the propeller of an airplane.
As the fan blades rotate, they push air all the way to the vent.
As air particles are pushed forward, the density of particles in front of the fan increases, so does the air pressure, and the density of particles behind the fan decreases.
The pressure drop behind the fan is just like the pressure drop in the straw when you suck a drink.The pressure behind the fan is lower than the pressure outside the vacuum cleaner, the ambient air pressure.This creates suction, or partial vacuum, inside the vacuum cleaner.Therefore, the air outside the vacuum cleaner enters the vacuum cleaner automatically through the air inlet.
The suction power of a vacuum cleaner is determined by several factors.The strength of suction depends on the following factors:
1. Fan power: the higher the engine speed, the stronger the suction.
2. Resistance to air passage: if a large amount of debris is accumulated in the dust collection bag, the resistance to air discharge will be increased.The increased drag causes each air particle to move more slowly.This is why the vacuum cleaner works better when you just replace the collection bag.
3. The size of the inlet end opening: since the speed of the vacuum cleaner fan is constant, the amount of air passing through the vacuum cleaner per unit time is constant.The amount of air entering a vacuum cleaner is the same per second regardless of the inlet size.If the intake is smaller, each air particle will move faster.According to Bernoulli's principle, the increase of air speed leads to the decrease of pressure, and the decrease of pressure makes the suction of air inlet bigger.As a result, a small vacuum cleaner attachment can produce greater suction, than a large opening attachment can be more able to absorb heavy dirt.
