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

Claim 6:
7. A centrifugal fan, comprising:
a first bearing;
a second bearing;
a shaft rotatably supported by the bearings;
fan blades operatively connected to and rotatable with the shaft to take in air axially and to exhaust air radially;
a housing enclosing the blades and a part of the shaft, the bearings located opposite one another across the housing;
multiple grooves in the shaft each extending axially along an outer surface of the shaft and spaced radially apart from one another around the shaft, each groove extending through the first bearing from outside the housing to inside the housing and through the second bearing from outside the housing to inside the housing;
an intake duct from outside the housing to a region surrounding the shaft inside the housing; and
an exhaust duct from an outer perimeter the blades inside the housing to outside the housing.