PRESSURE EQUALIZER.

摘要

Presented are systems and methods for maintaining a desired differential pressure between a cooling oil 110 of an electric motor 102 and a process gas working fluid 108 of a compressor 104 connected axially to the electric motor 102. The cooling oil 110 acts as a coolant for the motor compartment of the electric motor and the gas working fluid 108 acts as a coolant for the rotor compartment of the electric motor 102. At least one bellow 134 is configured to provide two sealed compartments in a pressure equalizer and a spring means 136 is configured to add a differential pressure to the cooling oil, assuring no leaks between the two fluids flows from the cooling oil to the process gas working fluid and no contact of the process gas working fluid with the electric motor stator, in particular electric motor laminations and electric motor windings.