Rotary screw compressor with shaft seal
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United States of America Patent
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-
Jun 24, 1997
Grant Date -
N/A
app pub date -
Jun 14, 1995
filing date -
Dec 21, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary screw compressor for oil-free air, wherein at least one of the shaft journals (11) of the rotors (10) has a seal arrangement between the rotor (10d) and an oil-lubricated bearing (12). The seal arrangement includes at least three frictionless seals (13, 14, 15) separated by annular chambers (16,17). The outermost annular chamber (17) is connected to a source of pressurized air through a supply channel (19) for supplying blocking air to the seal, and another (16) of the annular chambers communicates with a withdrawal channel (18).
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