초록 ▼

A centrifugal type refrigerant compressor comprises at least one impeller (17, 18), electric motor (27) and drive shaft (22) mounted on non-lubricated radial bearings, such as magnetic or foil gas bearings (23, 24), with axial locating means (26) associated with the shaft (22) to restrict axial move

A centrifugal type refrigerant compressor comprises at least one impeller (17, 18), electric motor (27) and drive shaft (22) mounted on non-lubricated radial bearings, such as magnetic or foil gas bearings (23, 24), with axial locating means (26) associated with the shaft (22) to restrict axial movement thereof with respect to the compressor housing (12). The housing (12) encases the motor (27) and the compressor and defines the gas inlet (31) and the gas outlet (16) passageways. Gas throttling means (34) is provided in the inlet (31), and a control means (30) varies the speed of the motor (27) and the throttling means (34) to control the compression ratio and mass flow through the compressor in accordance with the refrigeration load.

대표청구항 ▼

[ I claim:] [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

[ I claim:] [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; andcontrol 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.