Have you notice the vacuum cleaner ratings?Do yo know what the vacuum cleaner ratings are?But before introuduce the vacuum cleaner ratings,let us look at the history of vacuum cleaner.
Electric vacuum cleaner has been 100 years of history, for many people, it has become an indispensable household equipment, the reason is obvious.And different vacuum cleaners have different vacuum cleaner ratings. Current controlled motor operation. With a fan, the fan blade has a certain angle, just like the propeller of an aircraft. When the fan blade rotates, the air is pushed to the exhaust port. When the air particles are pushed forward, the particle density in front of the fan will increase, and the air pressure will increase accordingly, and the particle density in the rear of the fan will be reduced. The pressure drop on the rear side of the fan is the same as the pressure, drop in the suction tube when you suck a drink. The pressure at the rear of the fan is less than the external pressure of the vacuum cleaner. This will generate suction within the vacuum cleaner, which is part of the vacuum cleaner.It determines the vacuum cleaner ratings.
1901 Herbert Booth
Invention of the United Kingdom
Several inventors in nineteenth Century have developed a machine that can absorb dirt. Most machines are using a hand operated folding bellows. Some machines were made, including the success of the "Little Daisy". But they do not save labor, because it takes two to operate, an exhaust box, an alignment interface.
British engineer Herbert Booth made the first vacuum cleaner in 1901. It has a gasoline engine, and it is the first computer with a highly efficient filter of vacuum cleaner, it has a retain dirt filter cloth, the clean air back into the room. It is a large, bulky device that is intended to be used in the factory.
The vacuum cleaner booth was impressed by the American inventor J Murray spengler. He in 1900 made a smaller for household use vacuum cleaner and sells the rights of this design to a called William H. Hoover harness maker.