Compressor
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United States of America Patent
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Issued Date -
Sep 6, 2007
app pub date -
Sep 30, 2004
filing date -
Oct 17, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A helical screw rotor compressor adapted for working against a pressure container whose pressure P is allowed to vary between a lowest pressure P2 and a highest pressure P1, said compressor being driven by an electric motor. The electric motor is characterised by having in one operating range defined by the pressure interval P of said pressure container a quality such that halving of the torque of said motor will result an increase in motor speed of at least of 6 percent. It is also preferred that the compressor is optimised for an internal volume factor at which the pressure of the compressor will be lower than P2+0.85*(P1-P2) at the opening instance.
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