Patent Application
20080112806
This Non-provisional application claims priority under 35 U.S.C. ยง119(a) on Patent Application No(s). 095141667 filed in Taiwan, Republic of China on Nov. 10, 2006, the entire contents of which are hereby incorporated by reference.
1. Field of Invention
The invention relates to a fan and a fan housing thereof. In particular, the invention relates to a fan and a fan housing thereof that are capable of anti-backflow.
2. Related Art
As electronic devices provide better performance, operate at high frequencies and speeds and integrated in a smaller space, they generally generate more heat. The electronic devices are therefore likely to be unstable, lowering the reliability thereof. Therefore, heat dissipation becomes an important issue nowadays. Using a fan as a heat dissipating device is a common solution.
As shown in
To prevent the airflow from leaking out of the air outlet 13 of the fan when the fan 1 becomes ineffective or non-operating, an anti-backflow device 14 is usually disposed on the air outlet 13 to stabilize the airflow field therein. In this case, the airflow is forbidden to enter the system via the air outlet 13.
The anti-backflow device 14 has a frame 141 and several anti-backflow sheets 142. The frame 141 is connected and fixed on the fan housing 12 by using the installation holes 121. The anti-backflow sheets 142 are pivotally installed on the frame 141 and cover the air outlet 13. When the fan 1 operates, the airflow passes through the air outlet 13, pushes the anti-backflow sheets 142 and then goes out. When the fan 1 stops operating, the anti-backflow sheets 142 cover the air outlet 13 to prevent backflows. However, although the anti-backflow device 14 can avoid backflows and thus stabilize the airflow field inside the system, the anti-backflow device 14 often uses the installation holes 121 of the fan 1 to connect to the fan housing 12. In that case, the installation holes 121 are not allowable for the user to use. The use of the fan 1 is thus limited. In addition, the anti-backflow device 14 and the fan housing 12 are two separate pieces. Not only are they likely to depart from each other, it also takes more product cost and time.
Therefore, it is desirable to provide an anti-backflow fan and the fan housing thereof to prevent backflows. The installation holes of the fan can be preserved for the user to use without increasing the size of the fan. The production cost and time can be significantly reduced, and the entire performance of the fan can be enhanced.
In view of the foregoing, the invention is to provide an anti-backflow fan that can prevent backflows and have installation holes available for the user to use. Thus, the production cost and time can be significantly reduced, and the entire performance of the fan can be enhanced.
To achieve the above, the invention discloses a fan housing including a frame and a plurality of anti-backflow sheets. The frame has an opening on an outlet side and a plurality of fixing parts located at the opening on the outlet side. The anti-backflow sheets are respectively pivoted on the fixing parts and cover the opening on the outlet side.
To achieve the above, the invention also discloses a fan including a fan housing and a fan body. The fan housing includes a frame and a plurality of anti-backflow sheets. The frame has an opening on an outlet side and a plurality of fixing parts disposed at the opening on the outlet side. The anti-backflow sheets are respectively pivoted on the fixing parts for covering an opening on the outlet side. At least partial of the fan body is disposed inside the fan housing.
As mentioned above, the anti-backflow fan and fan housing of the invention have anti-backflow sheets connected to the fixing parts to cover the opening with the thicker fan housing. The installation holes are preserved for the user to use. In comparison with the prior art, the invention does not need to use any other components to prevent backflows. It can be applied to different size fans. Therefore, the fan of the invention can have wider applications. Moreover, the production cost and time can be reduced, and the performance of the fan can be increased.
The invention will become more fully understood from the detailed description given herein below illustration only, and thus is not limitative of the present invention, and wherein:
The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements.
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In order to prevent the anti-backflow sheets 212 from exceeding a maximum stroke and being unable to return to their original positions, several stopping elements 2114 are provided at the supporting parts 2112 to restrict their maximum strokes. In this embodiment, the stopping element 2114 is a protruding part connected to the corresponding supporting part 2112. The stopping elements 2114, the frame 211 and the fixing parts 2113 can also be formed as a single unit. When there is airflow, the anti-backflow sheets 212 reach their maximum strokes, and they are blocked by the stopping elements 2114. Therefore, when there is no airflow, the anti-backflow sheets 212 can go back to their original positions under the influence of gravity.
Please refer to
The frame 211 has several installation holes 2116 for the user to fix the fan 2 on a system. Since the anti-backflow sheets 212 are pivotally installed on the fixing parts 2113 directly, the installation holes 2116 can be preserved for the user to use.
It should be noted that the invention does not limit the shape or size of the fan housing 21, and neither the type nor function of the fan body 22 is restricted. For example, the fan can be an axial-flow fan or a centrifugal fan.
In summary, the anti-backflow fan and fan housing of the invention have anti-backflow sheets pivoted on the fixing parts due to the thicker fan housing. The installation holes are preserved for the user to use. In comparison with the prior art, the invention does not need to use any other components to prevent backflows. It can be applied to different size fans. Therefore, the fan of the invention can apply in more fields. Moreover, the production cost and time can be reduced, and the performance of the fan can be increased.
Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 095141667 | Nov 2006 | CN | national |
