Patent ID: 11927197
Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 10:
11. A centrifugal fan, comprising:
a bearing;
a shaft rotatably supported by the bearing;
fan blades operatively connected to and rotatable with the shaft to take in air axially to a lower pressure region and to exhaust air radially at an outer perimeter of the blades;
a housing enclosing the fan blades and a part of the shaft;
a groove in the shaft extending axially along an outer surface of the shaft through the bearing to the lower pressure region, wherein the groove comprises multiple grooves each extending axially along the outer surface of the shaft through the bearing to the lower pressure region and spaced radially from one another around the shaft;
an intake duct from outside the housing to the lower pressure region inside the housing, the intake duct being away from the bearing so that air moving into or through the intake does not pass over the bearing; and
an exhaust duct from the outer perimeter of the blades inside the housing to outside the housing.