Blade structure for a radial airflow fan

a blade structure and fan technology, applied in the field of blade structure of radial airflow fans, can solve the problems of significant noise generation and substantial amount of radial airflow, and achieve the effect of generating low noise and generating minimal nois

Inactive Publication Date: 2007-03-22
A POWER ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] The object of this invention is to provide a fan for producing a radial airflow that generates low noise when the fan rotates within a thermally conductive housing to serve as a heat dissipation fan.
[0008] According to this invention, a fan includes a hub rotatable about an axis and having an open end and a closed end, and a plurality of blades extending from the hub. Each of the blades has a leading side surface, a trailing side surface, an inner lateral edge corresponding to the open end of the hub, an outer lateral edge corresponding to the closed end of the hub, and a radial outer edge having opposite inner and outer ends connected respectively to the inner and outer lateral edges, and at least one end portion extending from one of the inner and outer ends toward both the axis and one of the inner and outer lateral edges. As such, when the fan rotates within a thermally conductive housing to serve as a heat dissipation fan, it can produce a radial airflow that generates a minimal amount of noise.

Problems solved by technology

A drawback of the aforesaid conventional fan is that, because the radial outer edge 222 of each of the blades 22 is parallel to the rotating axis of the hub 21, a substantial amount of radial airflow produced during rotation of the blades 22 comes into contact with an inner surface of the wall 11.
This results in the significant generation of noise.

Method used

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  • Blade structure for a radial airflow fan
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  • Blade structure for a radial airflow fan

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Embodiment Construction

[0031] Before the present invention is described in greater detail in connection with the preferred embodiments, it should be noted that similar elements and structures are designated by like reference numerals throughout the entire disclosure.

[0032] Referring to FIGS. 2 and 3, the first preferred embodiment of a radial airflow fan according to this invention is disposed rotatably within a thermally conductive housing 3 that has a wall 31, an air inlet 32 formed through a top wall portion of the wall 31, and an air outlet 33 formed through an annular wall portion of the wall 31. The fan includes a hub 4 and a fan unit consisting of a plurality of equidistant blades 5.

[0033] The hub 4 is rotatable about an axis (X), and has a peripheral wall 41, an open end 42, and a closed end 43.

[0034] The blades 5 extend from the peripheral wall 41 of the hub 4. Each of the blades 5 has a leading side surface 50, a trailing side surface 50′ opposite to the leading side surface 50, an outer late...

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PUM

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Abstract

A fan includes a hub rotatable about an axis and having an open end and a closed end, and a plurality of blades extending from the hub. Each of the blades has a leading side surface, a trailing side surface, an inner lateral edge corresponding to the open end of the hub, an outer lateral edge corresponding to the closed end of the hub, and a radial outer edge having opposite inner and outer ends connected respectively to the inner and outer lateral edges, and at least one end portion extending from one of the inner and outer ends toward both the axis and one of the inner and outer lateral edges.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a fan, and more particularly to a blade structure for a radial airflow fan. [0003] 2. Description of the Related Art [0004] Referring to FIG. 1, a conventional heat dissipation fan includes a thermally conductive housing 1 and a fan 2 disposed rotatably within the housing 1. The housing 1 has a wall 11, an air inlet 12 formed through a top wall portion of the wall 11, and an air outlet 13 formed through an annular wall portion of the wall 11. The fan 2 includes a hub 21 and a plurality of blades 22 extending from the hub 21. Each of blades 22 has an inner lateral edge 221 distal from the air inlet 12, an outer lateral edge 221′ proximate to the air inlet 12 and opposite to the inner lateral edge 221, and a radial outer edge 222 interconnecting corresponding ends of the inner and outer lateral edges 221, 221′. [0005] When the fan 2 rotates, air is sucked into the housing 1 through the air in...

Claims

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Application Information

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IPC IPC(8): F04D29/44
CPCF04D29/30F04D29/281F05D2240/304
InventorLIN, CHIH-CHENGWU, REN-YOW
OwnerA POWER ELECTRIC