Fig. 53.—A vacuum sweeper. (Courtesy of the Hoover Suction Sweeper Co.)
When the wheel is rapidly revolved, the fluid is driven out with considerable force through the opening at the rim, while a partial vacuum is produced at the axle causing a rapid flow into the device at this point.
This is the principle of the action of the vacuum cleaner. Fig. 53 is a section of a vacuum sweeper showing the revolving wheel and the current of air passing into the wheel at the lower side and out of the rim of the case at the rear.
Centrifugal water pumps work on the same principle and furnish a continuous flow of water, often large in volume and at considerable pressure.
Important Topics
1. Air pump.
2. Condensing pump.
3. Lift and force pumps.
4. Siphon.