초록 ▼

A turbo compressor in which a rotor having impellers is supported by a magnetic bearing is constructed such that a control valve is provided in a thrust balancing line connecting a suction line of the compressor to a balancing chamber formed outside a balancing drum provided at one end side of a rot

A turbo compressor in which a rotor having impellers is supported by a magnetic bearing is constructed such that a control valve is provided in a thrust balancing line connecting a suction line of the compressor to a balancing chamber formed outside a balancing drum provided at one end side of a rotor. The control valve serves to regulate a rate at which a gas flows through the thrust balancing line, and is adapted to be controlled in relation to a load imposed upon the magnetic thrust bearing.

대표청구항 ▼

A turbo compressor comprising: a rotor having a plurality of impellers arranged in an axial direction; a magnetic thrust bearing for supporting said rotor against a thrust force acting on said rotor, said magnetic thrust bearing including a pair of thrust bearing portions provided on opposite sides

A turbo compressor comprising: a rotor having a plurality of impellers arranged in an axial direction; a magnetic thrust bearing for supporting said rotor against a thrust force acting on said rotor, said magnetic thrust bearing including a pair of thrust bearing portions provided on opposite sides of a thrust collar provided on the rotor; a balancing drum provided at one end side of said rotor; a balancing chamber formed at an outer position of the compressor relative to said balancing drum; a thrust balancing line connecting said balancing chamber to a suction line of the compressor; a control valve provided in said thrust balancing line and operable to regulate a rate at which gas flows through said thrust balancing line to control a pressure in said balancing chamber so that a thrust force acting on said balancing drum is regulated, an opening of said control valve is controlled so that a control current for one of the thrust bearing portions at an inner position in the compressor is greater than a control current for the other thrust bearing portion at an outer position in the compressor; a rotor position detection sensor for detecting an axial displacement of said rotor; comparison means for comparing a signal from said rotor position detection sensor with a reference position signal; signal processing means for converting a deviation signal form said comparison means into a control signal for controlling said magnetic thrust bearing; amplification means for amplifying the control signal form said signal processing means into a control current for producing a desired magnetic force in said magnetic thrust bearing; and further comparison means for comparing the control signal for the magnetic thrust bearing portion at the inner position in the compressor with a reference inner magnetic thrust bearing portion signal, the opening of said control valve being controlled on the basis of the deviation signal from said further comparison means.