Radial air blowers: these are designed for industrial
use in small exhaust systems which are capable of handling air that contains
dirt particles while maintaining high-pressure supply of air (hence
self-cleaner). These have lowest efficiency levels as blades have no curve or
lean and are perpendicular to the wheel’s rotation.
Place: polluted air situations
Airfoil air blowers: these have the most efficient
design as they require lower horsepower levels to operate. Their blowers have
an airfoil shape that is wide at the centre and curves down to narrow edges.
Place: clean air situations
It is basically a device that removes
gas molecules from a sealed volume in order to leave behind a partial vacuum.
It was first invented by Otto Von Guericke
in 1650; which was preceded by the suction pump.
Vacuum pumps are used widely in many
industries and for scientifically researches. It includes composite plastic
moulding processes, driving some of the flight instruments in older and simpler
aircraft without electrical systems, production of most types of electric
lamps, vacuum tubes, & CRT’s where the device is either evacuated or
refilled with some gas. It is also used for semiconductor processing, notably
ion implantation, dry etch and PVD, ALD, PECD & CVD deposition, electron
microscopy; medical processes requiring suction and applications such as
radiotherapy, radio surgery and radio pharmacy and also in uranium enrichment.
