• US 5,857,348 A
  • Filed: 03/08/1996
  • Issued: 01/12/1999
  • Est. Priority Date: 06/15/1993
  • Status: Expired due to Term
First Claim
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1. A compressor for compressing a refrigerant having liquid and gaseous phases, comprising:

  • at least one centrifugal compressor stage having an impeller mounted on a shaft, the shaft being supported by oilless radial bearings;

    an electric motor for driving the shaft, the motor including a rotor connected to the shaft;

    axial locating means associated with the shaft to restrict axial movement thereof;

    a housing enclosing the motor and said at least one impeller, said housing incorporating an axially extending gas inlet and a gas outlet passage;

    gas throttling means in the inlet to control the supply of gas to the impeller, passageways in the housing to convey liquid refrigerant to cool the motor and to convey refrigerant gas from the motor to the gas inlet; and

    control means to control the gas throttling means in response to a refrigeration load, said control means adapted to generate control signals based on said load, said throttling means responsive to said control signals.

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