Abstract: A turbo compressor and a refrigeration cycle device having a turbo compressor are provided. The turbo compressor includes a housing having a motor chamber; a drive motor having a stator and a rotor in the motor chamber of the housing; a first compression portion and a second compression portion, respectively, provided on opposite ends of a rotary shaft; a connecting passage that connects an exit of the first compression portion and an entrance of the second compression portion; an inlet passage that penetrates a first side of the housing to communicate with an inside of the motor chamber and guide a refrigeration fluid to the motor chamber; and an outlet passage that penetrates a second side of the housing to communicate with the inside of the motor chamber and guide the refrigeration fluid in the motor chamber out of the housing.

Abstract: A turbo compressor is disclosed. The turbo compressor may have an assembly-type rotational shaft where a permanent magnet is inserted into a connecting sleeve, at least one first locking projection formed on either an inner periphery of the connecting sleeve or an outer periphery of the permanent magnet facing the inner periphery of the connecting sleeve, and at least one first locking groove formed on the other. Thus, the permanent magnet constituting a rotor may be easily coupled into the rotational shaft, and the permanent may be effectively prevented from slipping. Moreover, a magnet embedded in the rotational shaft may be securely fixed so that it is held in a position where it is assembled, thus providing an advantage in concentrically aligning the magnet.

Abstract: Disclosed herein is a thrust bearing for a turbo compressor, the thrust bearing has a structure that is modified in response to a portion where a deformation amount of a thrust runner is relatively large on the basis of magnitude of a force applied at the time of rotation of a shaft of a turbo compressor, to maintain a thickness of an oil film constantly and to increase a load supporting force of the thrust bearing, thereby ensuring improved durability of the thrust bearing.

Abstract: Disclosed herein is a thrust bearing for a turbo compressor, the thrust bearing has a structure that is modified in response to a portion where a deformation amount of a thrust runner is relatively large on the basis of magnitude of a force applied at the time of rotation of a shaft of a turbo compressor, to maintain a thickness of an oil film constantly and to increase a load supporting force of the thrust bearing, thereby ensuring improved durability of the thrust bearing.