Flat Blower Fan Device

A flat blower fan device, comprising:

• a volute including a center opening, an impeller chamber, a discharge outlet, and a lip protrusion, the center opening disposed at a center of the volute, the discharge outlet disposed at a side of the volute, the lip protrusion disposed at a perimeter edge of the center opening;
• and
• an impeller including a plurality of blades and a driving hub, the plurality of blades coupled to the driving hub and extends outward from the driving hub, the impeller rotatably disposed in the volute, the driving hub having a motor therein, the motor configured to drive the impeller to rotate;
• wherein the impeller chamber is defined by exterior sides of the driving hub and an interior of the volute;
• wherein a suction inlet is defined by the driving hub and the center opening, the suction inlet configured to enable air to be sucked in therethrough to the impeller chamber;
• and
• wherein the lip protrusion is configured to enable a beveled zone to be formed during rotation of the impeller, the beveled zone formed at a protrusion side of the lip protrusion opposite the suction inlet, the beveled zone configured to enable a constricted chamber zone to be formed within the impeller chamber, the constricted chamber zone formed at a chamber side of the beveled zone opposite the lip protrusion, an air pressure in the constricted chamber zone is lower and an airflow in the constricted chamber zone is faster than the air pressure and the airflow in the impeller chamber before the airflow enters the constricted chamber zone.