The hole in the middle of vacuum cleaners serves as an air intake or air inlet for the vacuum's suction system. It's a crucial component of the vacuum's design that allows it to create a powerful airflow to pick up dirt, dust, and debris from the floor or other surfaces.
Here's how it works:
Suction mechanism: Vacuum cleaners work on the principle of creating low-pressure areas inside the machine, which in turn generates suction. When you turn on the vacuum cleaner, an electric motor powers a fan or impeller located inside the unit.
Air intake: The hole in the middle of the vacuum cleaner, often covered by a filter or grate, provides a pathway for the surrounding air to enter the machine.
Airflow: As the electric motor drives the fan or impeller, it starts pulling air in through the air intake hole. This creates a flow of air that moves through the vacuum cleaner, carrying dust and debris along with it.
Filtration and containment: The air carrying dirt and debris is directed into a filtration system, where the dust and particles are trapped by filters or collection bags, preventing them from reentering the surrounding environment.
Exhaust: After passing through the filtration system, the air is expelled back into the room through an exhaust port, which is usually located at the back or side of the vacuum cleaner.
By having a central hole or air intake, vacuum cleaners efficiently draw in air from their surroundings, enabling them to create the necessary airflow for effective cleaning. Different vacuum cleaner designs may have slightly varying airflow configurations, but the air intake remains a fundamental feature in most vacuum models.