FAN DEVICE
A fan device includes a fan frame and a fan blade wheel. The fan blade wheel is movably joined to the fan frame and has a hub with fan blades extending radially from the circumferential side of the hub. A guiding groove is provided at the circumferential side of the hub between any two of the fan blades. The guiding groove has a leading section, which is a smooth shallow recess corresponding to direction of fluid flow, and a guiding section, which extends from the leading section and provides a deep recess. When the fan blade wheel rotates, the fluid moves along the leading section and is sucked to the guiding section before moving outward. Hence, it decreases chance of the intake fluid becoming turbulence or random flow and increases the fluid flow to enhance effect of heat dissipation significantly.
1. Field of the Invention
The present invention is related to a fan device and particularly to a fan device, which has a hub capable of guiding fluid effectively.
2. Brief Description of the Related Art
Referring to
The hub of the conventional fan device does not provide a guiding flow part except fan blades 112 so that the fluid flow moves toward all directions after passing through a space between every two neighboring fan blades once the fluid moves into the fan blade wheel 11. As a result, fluid pressure of the fluid moving toward the outlet 124 due to resistance of the outer surface of the hub 111 and becomes getting lower due to resistance of the outer surface of the hub 111 and it is easy to result in reversed flow at low pressure area of the back of the hub 111 to affect heat dissipation.
SUMMARY OF THE INVENTIONAccordingly, an object of the present invention is to provide a fan device in which a guiding groove is provided at the circumferential side of the hub of the fan blade wheel between every two neighboring fan blades to guide the fluid flow for decreasing turbulence of the intake flow and increasing fluid flow.
In order to achieve the preceding object, a fan device according to the present invention includes a fan wheel, which has a hub with a facial side, a circumferential side and an open side, and having a plurality of fan blades extending radially from the circumferential side, and a frame, which has a fluid outlet side and providing a fan wheel seat at the center of the air outlet side for movably fitting with the fan wheel; wherein the circumferential side has a plurality of guiding grooves and each of the guiding grooves is disposed between every two adjacent fan blades of the fan blade wheel.
The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which:
Referring to
The fan blade wheel 21 has a hub 211 with a plurality of fan blades 212 extending radially from a circumferential side 2112 of the hub 211. The hub 211 further has circular facial side 2111 perpendicular to the circumferential side 2112 and an open side opposite to the facial side 2111 such that a motor stator and rotor (not shown) are capable of receiving in the hub 211. A shaft (not shown) is joined to the inner side of the facial side 2111 and movably fits with an axial barrel 227 disposed at and extending from the center of the fan wheel seat 221. Further, a plurality of guiding grooves 213 are provided at the circumferential side 2112 of the hub 211 next to the fan blades 212.
Referring to
When the fan wheel rotates, fluid near the hub 211 as the dash lines shown in
The preceding embodiment is illustrated with the fan blade wheel rotates clockwise. In case of the fan blade wheel rotates counterclockwise as shown in
Referring to
While the invention has been described with referencing to preferred embodiments thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims.
Claims
1. A fan device comprising:
- a fan wheel having a hub with a facial side, a circumferential side and an open side, and having a plurality of fan blades extending radially from the circumferential side;
- a frame having an air outlet side and providing a fan wheel seat at the center of the air outlet side for movably fitting with the fan wheel;
- wherein the circumferential side has a plurality of guiding grooves and each of the guiding grooves is disposed between every two adjacent fan blades of the fan blade wheel.
2. The fan device as defined in claim 1, wherein the fan wheel seat is joined to an inner wall of the frame with a plurality of rib bars.
3. The fan device as defined in claim 1, wherein the respective guiding groove further comprises:
- a leading section being disposed corresponding to direction of fluid flowing and extending along the circumferential side to constitute a smooth shallow recess; and
- a guiding section extending from the leading section and extending inward the circumferential side to form a deep recess.
4. The fan device as defined in claim 1, wherein the respective guiding groove extends from the facial side to the open side.
5. The fan device as defined in claim 1, wherein the facial side has a flat surface.
6. The fan device as defined in claim 1, wherein the facial side has a shape similar to a cone.
7. The fan device as defined in claim 6, the guiding grooves extend to the tip of the facial side from the open side.
Type: Application
Filed: Dec 20, 2006
Publication Date: Jun 26, 2008
Inventors: Tzyy-Pyng Lin (Kaohsiung), Fu-Kuei Chang (Kaohsiung)
Application Number: 11/613,328
International Classification: F01D 1/00 (20060101);