FAN DEVICE CAPABLE OF INCREASING AIR PRESSURE AND AIR SUPPLY
A fan device capable of increasing air pressure and air supply includes a fan frame, a base and a fan wheel. The fan frame has an air inlet side, an air outlet and a flow path which defined by the inner wall of the frame. The base is disposed in the flow path and joined to the inner wall of the fan frame by means of a plurality of elongated fan blade shaped connecting parts being attached to the inner wall of the frame. The fan wheel is movably attached to the base from the air inlet side. The base further includes a main base part and a shoulder part with a streamline contour extending from a lateral side of the main base part to approach the air outlet side of the fan frame such that a concave inward curved surface converging toward a central axis of the base is formed with a tip end is disposed at the central axis to concentrate fluid flow and increase air pressure for eliminating stagnation zone and promoting heat dissipation.
1. Field of the Invention
The present invention is related to a fan device and particularly to a fan device capable of increasing air pressure and air supply for eliminating stagnation zone behind the base of the fan device.
2. Brief Description of the Related Art
Normally, the conventional fan includes a fan wheel and a fan frame. The fan frame has a base for being rotatably attached with the fan wheel, an air inlet and an outlet. The air outlet is disposed corresponding to a heat generating component and the fan frame is attached to the heat generating component with at least a fastening element. Due to the base having a flat shape area, a low pressure zone is constituted behind the base. When air flows outward the fan frame via the outlet, air flows back at the low pressure zone instead of moving to the heat generating component to decrease heat dissipation efficiency tremendously.
In order to overcome the preceding deficiency, Taiwan Patent Application Publication No. 200622111 entitled “GUIDE FLOW DEVICE FOR A FAN” provides a flow guide device at the outlet side corresponding to the a heat sink. The flow guide device includes a guide flow shield and a guide element disposed in the guide flow shield. The guide flow shield has a shape of nozzle with a streamline curved surface at the inner side thereof. The end with a large diameter is the air intake port and the end with small diameter is the air outward port. The guide element is disposed at the air intake port corresponding to the hub and has a shape of convergence with a streamline outer surface.
When the fan is started to produce forcing air flow, the air flow enters the guide flow device via the air intake port and passes through the guide flow shield and the guide element. Then, the air flow moves outward via the air outward port and becomes high speed uniform shooting flow.
However, a problem of the preceding prior art is in that the air outward port of the guide flow device has a fixed area to limit amount of air flow such that only a certain area of the heat sink can perform heat exchange with the air flow. Another problem of the preceding prior art is that the fan and the flow guide device vibrate during the fluid flowing to the guide flow device to increase noise. Moreover, a further problem of the preceding prior art is that the guide flow device increases costs and weight of the fan.
SUMMARY OF THE INVENTIONAccordingly, an object of the present invention is to provide a fan device capable of increasing air pressure and air supply in which the base has a main base part with a concave inward curved surface being convergent along with extending toward the air outlet side for guiding the fluid to a heat sink under the base.
another object of the present invention is to provide a fan device capable of increasing air pressure and air supply in which the concave inward curved surface is capable of gathering the air flow and increasing air pressure for decreasing noise.
In order to achieve the preceding object, a fan device capable of increasing air pressure and air supply according to the present invention includes a fan frame, a base and a fan wheel. The fan frame has an air inlet side, an air outlet and a flow path which defined by the inner wall of the frame. The base is disposed in the flow path and joined to the inner wall of the fan frame by means of a plurality of elongated fan blade shaped connecting parts being attached to the inner wall of the frame. The fan wheel is movably attached to the base from the air inlet side. The base further includes a main base part and a shoulder part with a streamline contour extending from a lateral side of the main base part to approach the air outlet side of the fan frame such that a concave inward curved surface converging toward a central axis of the base is formed with a tip end is disposed at the central axis to concentrate fluid flow and increase air pressure for eliminating stagnation zone and promoting heat dissipation.
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:
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In addition, the fluid moving along the curved surface 133 of the base 13 is capable of lessening back flow to decrease noise created by the fluid.
It is noted that although the fan device of the present invention has arrange the guide parts at the inner wall of the fan frame, function of concentrating the fluid at the base can be performed as well even if no guide parts are provided.
While the invention has been described with referencing to a preferred embodiment 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 capable of increasing air pressure and air supply comprising:
- a fan frame with an circumferential inner wall, having an air inlet side, an air outlet and a flow path, and the flow path being defined by the inner wall and communicating with the air inlet side and the air outlet side;
- a base, being disposed in the flow path and joined to the inner wall of the fan frame by means of a plurality of elongated fan blade shaped connecting parts attached to the inner wall of the fan frame; and
- a fan wheel, being movably attached to the base from the air inlet side;
- wherein the base further comprises a main base part and a shoulder part, which has a streamline contour extending from a lateral side of the main base part to approach the air outlet side of the fan frame, and provides a concave inward curved surface converging toward a central axis of the base such that a tip end is formed at the central axis.
2. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the fan wheel is disposed at another side of the base opposite to the top end.
3. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein a plurality of fan blade shaped guide parts surrounding the base and each of the guide parts has a joining end side being attached to the inner wall of the fan frame and a free end side being opposite to the joining end side and facing the base such that a first space is formed between the base and the free end side.
4. The fan device capable of increasing air pressure and air supply as defined in claim 3, wherein a second space is formed between every two adjacent guide parts.
5. The fan device capable of increasing air pressure and air supply as defined in claim 1, wherein the tip end is disposed at a position next to the outlet side.
Type: Application
Filed: Nov 3, 2006
Publication Date: May 8, 2008
Inventors: BOR-HAW CHANG (Kaohsiung), Wen-Hao Liu (Kaohsiung), Chia-Lieh Huang (Kaohsiung)
Application Number: 11/556,603
International Classification: F04D 29/52 (20060101); F04D 3/00 (20060101);