TURBO BLOWER CAPABLE OF ACTIVELY ADJUSTING TIP CLEARANCE OF IMPELLER

摘要

A turbo blower capable of actively adjusting the tip clearance of an impeller is provided to improve the aerodynamic stability by the active response as to the serge and stole phenomena. A turbo blower capable of actively adjusting the tip clearance of an impeller includes a casing(102) having air inlet and outlet ports(104,106); a rotary shaft(107) rotatably supported in the casing, movably installed to the axial direction of the casing, and projected with a thrust collar(108) at the end adjacent to the outlet port; an impeller(110) placed around the air inlet port and combined with the rotary shaft; a motor rotating the rotary shaft; a first pressure unit formed with a pair of electrodes facing each other and a piezoelectric ceramic pad(140) installed between the electrodes to contain the piezoelectric actuator connected to the power supply, and fixed at the casing to face the thrust collar so as to press the rotary shaft to the inlet port side; and a second pressure unit pressing the rotary shaft to the opposite direction to the applied pressure of the first pressure unit.