Flat Blower Fan Device

Abstract

A flat blower fan device may include a volute and impeller. The impeller is rotatably disposed in the volute. The volute includes a center opening, an impeller chamber, discharge outlet, and lip protrusion. The discharge outlet is disposed at a side of the volute, and the lip protrusion is disposed at a perimeter edge of the center opening. The lip protrusion is configured to enable a beveled zone to be formed at a protrusion side of the lip protrusion during rotation of the impeller. The beveled zone is configured to enable a constricted chamber zone to be formed within the impeller chamber. The constricted chamber zone is formed at a chamber side of the beveled zone. An air pressure in the constricted chamber zone is lower and an airflow is faster than the air pressure and the airflow in the impeller chamber before the airflow enters the constricted chamber zone.

1 . 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.   
     
     
         2 . The flat blower fan device of  claim 1 , further comprising a rotation axis and a constricted chamber zone rotation angle, and wherein the lip protrusion comprises an arc length, the arc length defined from a first end of the lip protrusion to a second end of the lip protrusion, the rotation axis defined by an impeller center of the impeller, the constricted chamber zone rotation angle defined by a rotation amount respectively measured from the rotation axis to the first end and the second end, the constricted chamber zone rotation angle between 45 degrees and 180 degrees, inclusive. 
     
     
         3 . The flat blower fan device of  claim 1 , wherein the volute comprises a shroud base, a shroud cover, and a volute side wall, wherein the center opening includes a base center opening and a cover center opening, and wherein the lip protrusion includes a base lip protrusion and a cover lip protrusion, the volute side wall respectively coupled between a base perimeter edge of the shroud base and a cover perimeter edge of the shroud cover, a base outlet perimeter edge of the shroud base, a cover outlet perimeter edge of the shroud cover, and a first outlet perimeter edge and a second outlet perimeter edge of the volute side wall define the discharge outlet, the base center opening disposed at a base center of the shroud base, the cover center opening disposed at a cover center of the shroud cover, the base lip protrusion disposed at a base opening edge of the base center opening, and the cover lip protrusion disposed at a cover opening edge of the cover center opening. 
     
     
         4 . The flat blower fan device of  claim 3 , wherein the shroud base comprises a flange impeller hub, and wherein the suction inlet includes a base suction inlet and a cover suction inlet, the flange impeller hub centrally disposed in the shroud base, the impeller rotatably coupled to the shroud base via the driving hub and the flange impeller hub, the base suction inlet is defined by the flange impeller hub and the base center opening, and the cover suction inlet is defined by the driving hub and the cover center opening. 
     
     
         5 . The flat blower fan device of  claim 3 , wherein the volute side wall comprises an outlet side wall portion, the outlet side wall portion including a protrusion, the outlet side wall portion coupled at the first outlet perimeter edge, the protrusion protruding in a direction toward the second outlet perimeter edge and at an end of the constricted chamber zone. 
     
     
         6 . The flat blower fan device of  claim 4 , wherein each plurality of blades comprise a blade root and a blade edge, the blade root coupled at the driving hub, the blade edge disposed on an opposite end of the blade root, the blade root having a root width and the blade edge having an edge width, the edge width greater than the root width. 
     
     
         7 . The flat blower fan device of  claim 6 , wherein the cover lip protrusion comprises a lip cover constriction wall and a lip cover ledge, the lip cover constriction wall between the lip cover ledge and the cover center opening, and wherein the base lip protrusion comprises a lip base constriction wall and a lip base ledge, the lip base constriction wall between the lip base ledge and the base center opening. 
     
     
         8 . The flat blower fan device of  claim 7 , wherein a constriction height is defined as a distance between the lip cover ledge and the lip base ledge, the constriction height is equal to or less than the edge width. 
     
     
         9 . The flat blower fan device of  claim 3 , wherein the shroud base and the volute side wall are integrally formed. 
     
     
         10 . The flat blower fan device of  claim 1 , wherein the lip protrusion further includes a filler component, the filler component opposite the beveled zone filling an area between the lip protrusion and a plane of a surface of the volute.