Helical screw compressor having a vented sealing arrangement
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United States of America Patent
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May 11, 2010
Grant Date -
Jan 1, 2009
app pub date -
Jun 9, 2006
filing date -
Dec 8, 2005
priority date (Note) -
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Abstract
A helical screw compressor includes two rotors which are mounted in the rotor housing. The helical screw compressor includes sealing arrangements (11, 11') for sealing the pressure-sided shaft journals of the rotors. Each sealing arrangement includes a plurality of annular seals (11a, 11b) which are arranged in a row adjacent to each other, and an annular-shaped discharge chamber (51) is associated with the system on an intermediate position and is connected, via a discharge channel (53), to the chamber in the rotor housing, wherein pressure which is higher than the atmospheric pressure. Preferably, the discharge channel is connected to the suction chamber (10) of the rotor housing (1), and is impinged upon by precompressed gas from an upstream compressor step.
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