TURBO COMPRESSOR

PURPOSE: A turbo compressor is provided to improve efficiency and compression performance of gas, and to design and manufacture conveniently. CONSTITUTION: A turbo compressor comprises a closed container(100); a driving motor(200) installed in a motor chamber(140) to generate a driving force; a driving shaft(300) inserted to first, second and third compression chambers(110,120,130), and combined with the driving motor to transmit the driving force; a first impeller(310) rotatably combined with the driving shaft in a first compression chamber, and compressing and moving gas to the first compression chamber through a second gas passage(160); a second impeller(320) rotatably combined with the driving shaft in the second compression chamber, and compressing and moving the gas through a third gas passage(170) to the third compression chamber(130); and a third impeller(330) rotatably combined with the driving shaft in a third compression chamber, and compressing and discharging the gas to a discharge port(131). A radial bearing(340) is installed in the motor chamber(140) and is designed easily by placing the center of gravity of the driving shaft in the middle portion of the driving shaft, and compression performance is improved by smoothly rotating the driving shaft.