Patent ID: 9599115
Date: 2017-03-21
CPC Classifications: F04D

Claim:
1. A series fan comprising: a first fan having a first frame, a second frame and a first flow passage, the first flow passage communicating with the first and second frames, a first static blade being disposed at the first frame, a first opening being formed at the second frame, a first dynamic blade assembly being disposed in the first flow passage in communication with the first opening; and a second fan having a third frame, a fourth frame and a second flow passage, the second flow passage communicating with the third and fourth frames, the third frame being assembled with the second frame, a second opening being formed at the third frame, the second opening communicating with the first opening, a second dynamic blade assembly being disposed in the second flow passage in communication with the second opening and in adjacency to the first dynamic blade assembly, a second static blade being disposed at the fourth frame; wherein the first dynamic blade assembly includes multiple first blades, while the second dynamic blade assembly includes multiple second blades; wherein the multiple first blades are spaced from the multiple second blades in the second flow passage by a distance; and wherein each of the multiple first blades has an extension portion extending from the first flow passage through the first opening and the second opening to the second flow passage.