Bladeless fan with multiple air ducts

A bladeless fan with multiple air ducts comprising a fan housing, a control system arranged in the fan housing, a blower system connected with the control system, an intermediate air duct communicating with the blower system and a rotation component connected with the control system;

• wherein the intermediate air duct is provided with a side air duct at its both sides, the rotation component is connected with the side air duct to drive the side air duct to expand and retract with the intermediate air duct as a center shaft;
• wherein the rotation component comprises a driving gear, a driven rack plate, a driven gear and a first driving part connected with the driving gear;
• wherein both outer sides of the driven rack plate are oppositely provided with a first rack engaging with the driven gear, respectively, while both inner sides of the driven rack plate are oppositely provided with a second rack engaging with the driving gear, respectively;
• wherein the second rack is parallel to the first rack, the side air duct is provided with a rotation bearing connected with the driven gear, such that when the first driving part drives the driving gear to rotate, the driven gear connected with the rotation bearing of the side air duct is brought to rotates through a reciprocation movement of the driven rack plate engaging with the driving gear, such that the side air ducts at both sides of the intermediate air duct rotate clockwise and counterclockwise respectively, that is, to expand or retract with the intermediate air duct as the center shaft.