Patent ID: 11879475
Assignee: DELTA ELECTRONICS, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A fan, comprising:
a motor base having a bearing stand in a center portion thereof;
a bearing accommodated within said bearing stand;
an impeller comprising:
a metallic case having a top wall and a sidewall extended axially from an outer periphery of said top wall, wherein said top wall has a central opening, a top surface, a bottom surface opposite the top surface, and a depth of said central opening is equal to a thickness defined from the top surface to the bottom surface of said top wall,
plural blades disposed around an outer periphery of said metallic case for driving axial airflow or radial airflow, and
a rotating shaft inserted into said central opening and penetrated through said bearing stand, said rotating shaft is combined within said central opening by a laser welding process;
a stator disposed around an outer periphery of said bearing stand;
a magnetic element disposed on said metallic case and aligned with said stator; and
a fan frame, which is arranged at an outer portion of said fan,
wherein the bottom surface of the top wall is flat and continuous in a radial direction from the central opening to the magnetic element,
wherein the plural blades and the metallic case are integrally formed.