A vacuum pump is simply a pump that moves air into or out of something else. Sometimes it removes gas from an area, leaving a partial vacuum behind; other times a vacuum pump will remove water from one area to another, as a sump pump does in a basement. Vacuum pumps are used in an industrial setting to produce vacuum tubes and electric lamps, and to process semiconductors.
They can also produce a vacuum that can then be used to power a piece of equipment. In aircrafts, for example, the gyroscopes located in some of the flight instruments are powered by a vacuum source in case of an electrical failure..
A vacuum pump converts the mechanical input energy of a rotating shaft into pneumatic energy by evacuating the air contained within a system. The internal pressure level thus becomes lower than that of the outside atmosphere. The quantity of energy produced depends on the volume evacuated and the pressure variation produced.
Automatic vacuum pumps use the same pumping method as air compressors, except that the unit is installed so that air is drawn from a closed amount and worn out to the atmosphere. A major disparity between a vacuum pump and other types of pumps is that the pressure lashing the air into the pump is below atmospheric and becomes vanishingly small at higher vacuum levels.
As in compression, the vacuum-generating process can be proficient in just one pass through a pumping chamber. Or several stages may be required to obtain the desired vacuum.
The motorized provision are also similar to those for air compression. The release port of the first stage feeds the intake port of the second stage. This reduces the pressure, and hence the solidity, of air trapped in the clearance volume of the first stage.