Patent ID: 8727717
Filing Date: 2014-05-20
Classification: F04D

Abstract:
1. A serial fan module, comprising: a first fan, comprising a first frame body and a first impeller disposed within the first frame body, wherein the first frame body comprises a first expanded part at an inlet of the serial fan module; a second fan, comprising a second frame body and a second impeller disposed within the second frame body, wherein the second frame body comprises a second expanded part at an outlet of the serial fan module; and a plurality of guide elements guiding an airflow from the first fan to the second fan and being disposed between the first impeller and the second impeller; wherein each of the guide elements comprises an axial extended part and an inclined part, the axial extended part is parallel to an axial axis of the serial fan module, and the inclined part meets the axial extended part at a camber angle; wherein each of the inclined part comprises an inner edge toward the first impeller, and each of the axial extended part comprises an outer edge toward the second impeller; wherein the inclined part is part of the first frame body and the axial extended part is part of the second frame body; wherein each of the inclined part and each of the axial extended part respectively comprise an outer side, the entirety of the outer side is parallel to the axial axis; wherein the first impeller comprises a plurality of first blades having a first top side and a first bottom side, the first top side inclines to a radial direction of the first fan by a first angle, and the first bottom side inclines to the radial direction of the first fan by a second angle, the first angle and the second angle are both between 3 and 45 degrees, and the first angle is either greater than or smaller than the second angle.