Turbo compressor and refrigeration cycle device having turbo compressor

A turbo compressor, comprising:

• 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, wherein an axial support portion is provided in the motor chamber to provide support with respect to an axial direction for the rotary shaft, the axial support portion including:
• a thrust runner that radially extends from the rotary shaft;
• a first partition wall fixed to the housing and positioned between the thrust runner and the first compression portion;
• and
• a second partition wall axially spaced apart from the first partition wall and fixed to the housing, that axially overlaps the thrust runner and is positioned between the thrust runner and the drive motor, wherein a refrigerant intake passage forming the inlet passage is provided in the first partition wall, and an end of the refrigerant intake passage is open to a first side of the first partition wall facing the thrust runner, wherein an axial bearing is provided between a first side of the thrust runner and the first partition wall and between a second side of the thrust runner and the second partition wall, and wherein the end of the refrigerant intake passage is positioned radially closer to the rotary shaft than the axial bearing.

A turbo compressor, comprising:

• 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, wherein an axial support portion is provided in the motor chamber to provide support with respect to an axial direction for the rotary shaft, the axial support portion including:
• a thrust runner that radially extends from the rotary shaft;
• a first bearing shell fixed to the housing and positioned between the thrust runner and the first compression portion;
• and
• a second bearing shell axially spaced apart from the first bearing shell and fixed to the housing, that axially overlaps the thrust runner and is positioned between the thrust runner and the drive motor, wherein the first bearing shell includes:
• an inner wall portion with a first shaft hole into which a first end of the rotary shaft is rotatably inserted;
• a first side wall portion formed in the shape of a ring that radially extends from a first side of an outer circumferential surface of the inner wall portion;
• a second side wall portion formed in the shape of a ring that radially extends from a second side of the outer circumferential surface of the inner wall portion;
• and
• a refrigerant receiving portion provided between the first side wall portion and the second side wall portion, with an inner peripheral side facing the rotary shaft and being blocked by the inner wall portion, and an outer peripheral side facing an inner circumferential surface of the housing and being at least partially open, wherein the inlet passage radially overlaps the refrigerant receiving portion.