Patent Application
20080008576
The present invention relates to a shock-absorbent structure of serially-connected fans, wherein the serially-connected fans are composed of at least two fans that are serially connected, a shock-absorbent element is disposed between the jointed surfaces of two neighboring fan frames, and the damping and shock-absorbent characteristics of the shock-absorbent element itself are utilized to isolate and reduce the fundamental frequency of vibration of the serially-connected fans.
Listed below are two preferred embodiments illustrative of actual applications for dual fans that are serially connected.
Please refer to
The fan frame 10 has a hollow containing space for accommodating a fan rotor (not shown), and a based 13 is disposed at one end of the containing space. The base 13 is integrally integrated with the fan frame 10 by means of a plurality of ribs 14, in which the base 13 is for assembling a driving device (not shown) to drive the fan rotor for operation. The holes between ribs are provided as a passage for air flow circulation.
The present invention further provides a shock-absorbent element 20 disposed between the surfaces of the two fan frames to be serially connected. The form of the shock-absorbent element 20 corresponds to and shall not be greater than the shape of the base 13. A shallow recess 21 is provided on an external end surface of a respective base 13 of the two serially-connected fan frames, such that the shock-absorbent element 20 can be disposed between the two shallow recesses 20 and sandwiched and fastened by the two bases 13.
The shock-absorbent element 20 shall be made of a flexible material being shock-absorbent and damping, e.g. rubber, foam, sponge, polyurethane and the like. As such, when the fan rotors inside the two fan frames 10 rotate at the same time, the vibration amplitude arising from rotation of two fan rotors is absorbed and isolated by the shock-absorbent element 20, ensuring that the fundamental frequencies of the two fan rotors won't be interacted to avoid the generation of resonant effect and noise.
Further refer to Annex 1 and Annex 2. The Annex 1 and 2 are the tables containing the vibration test values measured from the identical serially-connected fans in accordance with the rotation speeds at 15,000 rpm and 14,000 rpm respectively.
Annex 1 is a vibration test value table for a conventional structure, where the measured vibration speed value Acc—0.5G is 0.00947 m/s, and the vibration acceleration value Acc—0.5G is 17.2 m/(s2). Annex 2 is a vibration test value table for the present invention, where the measured vibration speed value Acc—0.5G is 0.00349 m/s, and the vibration acceleration value Acc—0.5G is 8.89 m/(s2).
The above-mentioned test results signal that the shock-absorbent element 20 of the present invention allows the vibration speed of entire serially-connected fans and the vibration acceleration to drop 63% and 48% respectively. Therefore, the shock-absorbent element 20 can effectively isolate and damp the fundamental frequencies of two fan rotors indeed, whereby the fundamental frequencies of vibration of the two fan rotors won't be interacted, to prevent the serially-connected fans from generating resonant effect and noise.
Besides,
After comparing the shock-absorbent structure of the serially-connected structure in the present invention with the aforementioned conventional structure, the present invention at least includes the following characteristics of:
alleviating vibration and generating no resonant effect: The present invention employs a damping and shock-absorbent measure in a positive manner. Using the damping and shock-absorbent nature of the shock-absorbent element can isolate and lower the fundamental frequencies of serially-connected fans to avoid the severe resonant effect of fan generated by the interaction of the fundamental frequencies of vibration.
maintaining the optimized efficacy and the life span of system: The shock-absorbent element damps and absorbs the fundamental frequencies of serially-connected fans and avoids to result in the resonant effect. As a consequence, when a system is no longer subjected to the impact on the vibration amplitude resulting from rotation of the fan rotors, it can make the most of the optimized efficacy of the system and secure a normal operation life duration.
generating no resonant noise: The shock-absorbent element not only isolates and damps vibration but also prevents from further generating resonant noise.
In sum, the present invention surely possesses the aforementioned benefits and provides a substantial performance improvement in comparison with the conventional structure. Furthermore, the present invention not only has a novelty among similar products and a progressiveness, but also has an industry utility.
While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims, which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
| Number | Date | Country | Kind |
|---|---|---|---|
| 95124304 | Jul 2006 | TW | national |
