In Britain in the 1920s, vacuum cleaners were produced. The vacuum cleaner mainly consists of three parts: dust collection, dust collection and dust filtration, generally including series commutator motor, centrifugal fan, dust filter (bag) and dust collection accessories. Generally, the power of vacuum cleaner is above 400- 1000W, and that of portable vacuum cleaner is generally below 250W w. Vacuum cleaner can remove dust mainly because its "head" is equipped with an electric exhaust fan. There is a wind wheel on the rotating shaft of the exhaust fan. After electrifying, the exhaust fan will generate extremely strong suction and pressure at a speed of 500 revolutions per second. Under the action of suction and pressure, the air will be discharged at high speed, and the air in the dust suction part at the front end of the fan will continuously replenish the air in the fan, resulting in an instantaneous vacuum inside the vacuum cleaner and a negative pressure difference with the external atmospheric pressure. Under the action of this pressure difference, dusty air will be sucked in. Dust and other sundries enter the dust collection bag through carpet or floor brush, long nozzle, elbow, hose and hose connector in turn. Dust and other sundries are left in the dust bag, and the air is purified by the filter and discharged from the tail of the machine body.
Because the gas is heated when it passes through the motor, the gas discharged from the tail of the cleaner is hot. There is a dust collecting box in the suction bucket of the vacuum cleaner, and the dust is left in the dust collecting box. When the box is full, you can take it out and wash it with water. Vacuum cleaner can use different parts to complete different cleaning tasks, such as floor brush to clean the floor, flat brush to clean the sofa surface, sheets, curtains and so on. There is also a small suction nozzle, which can remove dust from small corners and dirt from some household appliances.