Axial-flow fan unit and heat-emitting element cooling
AssigneeSanyo Denki Co., Ltd.
InventorsMichinori Watanabe, Toshiki Ogawara, Haruhisa Maruyama
Life of this patent
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Abstract
An axial-flow fan unit that produces less noise is provided. Blades 19 are exposed from a venturi 29. The shape of each of the blades 19 is so defined that a space formed between at least an inner surface 28a of each of web leg sections 28A to 28C and an edge 19a of each of the blades 19 located in the radially outward direction of the blades 19 expands toward the ends of the web leg sections 28A to 28C (or web bodies 30A to 30C). With this arrangement, noise produced when the blades 19 rotate along the web leg sections 28A to 28C is reduced.
Claims4
A heat-emitting element cooling apparatus comprising:
- a heat sink including a base with a heat-emitting element to be cooled mounted on a rear surface thereof and a heat radiation fin group comprising a plurality of radiation fins, fixed to said base;
- and
- an axial-flow fan unit arranged on said heat sink, for blowing air along at least said radiation fins constituting said radiation fin group to promote heat dissipation from said radiation fins;
- wherein said axial-flow fan unit comprises:
- a motor having a revolving shaft;
- an impeller having a plurality of blades and mounted on said revolving shaft;
- a cylindrical venturi for surrounding said impeller in a radial direction of said revolving shaft;
- and
- a plurality of webs spaced in a circumferential direction of said revolving shaft, for connecting said venturi to a housing of said motor;
- wherein a shape of said venturi is so defined that part of said blades located on a side of said housing of said motor can be seen as viewed from a radially outward direction;
- wherein each of said webs comprises:
- a web leg section extending from an end of said venturi toward a side of said housing of said motor, said web leg section having an inner surface continuous with an inner periphery surface of said venturi and curved along said inner periphery surface;
- and
- a web body located between said housing and an end of said web leg section on the side of said housing;
- and
- a shape of each of said blades is so defined that an angle between an edge of each of said blades and a virtual cylinder with which a radially outermost vertex of said edge of each of said blades is inscribed, becomes 4° or more.
Dependencies are inferred from the claim text.