BEARING STRUCTURE OF ROTARY MACHINE, REVOLVING SPEED CONTROL DEVICE, AND REFRIGERATING CYCLE CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a bearing structure for rotatably supporting a rotating shaft of a rotary machine and a revolving speed control device for controlling a revolving speed of the rotary machine applying the bearing structure, and to improve reliability of the bearing structure concerning a refrigerating cycle control device for controlling operation of a refrigerating cycle provided with a compressor applying the bearing structure.

SOLUTION: The bearing structure is provided with a rotating regulation means 263 for fixing a sliding bearing 261 rotatably supporting a shaft 25 on an inside race 262a of a rolling bearing 262 and regulating relative rotation of the inside race 262a and the outside race 262b of the rolling bearing 262 until rotating torque transmitted from the sliding bearing 261 to the rolling bearing 262 is a preset reference rotating torque or above. Thereby the shaft 25 is supported by the sliding bearing 261 with high reliability rather than the rolling bearing 262 until the rotating torque is the reference rotating torque or more. Furthermore, when the rotating torque is the reference rotating torque or above, the relative rotation of the inside race 262a and the outside race 262b is allowed to support the shaft 25 with the rolling bearing 262 so as to suppress wear of the sliding bearing 261.

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