A primary category of Vacuum pumps actually used and known to those of ordinary skill in the art are those which operate by means of an eccentric rotor having lamellae or vanes mounted thereon. Typically, the pump housing includes a stator having an internal chamber with a generally cylindrical shape. The eccentrically mounted rotor is furnished with a plurality of lamellae which are pulled outwardly from the rotor by centrifugal force and which form a tight revolving seal against the inside of the cylindrical chamber. Adjacent lamellae form chambers having variable volume depending upon their position with respect to the stator chamber. More specifically, the variable volume chambers are formed between the inner surface of the cylindrical chamber, the outer surface of the rotor and the facing surfaces of adjacent lamellae. In order to obtain suction a port is provided immediately downstream of the area having the minimum radius between the rotor and the cylindrical chamber of the stator body. An exit port is typically placed just upstream of that location. Such vacuum pumps are often referred to as decompressors and are typically employed to pump gases such as air.

Because of their structure, the pumps just described tend to develop large amounts of heat. Much of the heat is produced by the friction of the rotor lamellae against the inner surface of the cylindrical stator chamber. Heat is also generated by the changing volume of the gas as it is compressed in the pump. Therefore, many prior art pumps of this nature are water cooled and have to be very efficiently designed if used for heavily loaded operations or if employed under conditions of stress.

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2012-06-06

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