Patent ID: 8807969
Filing Date: 2014-08-19
Classification: F04D

Abstract:
1. A fan assembly, comprising: a housing having an air-flowing channel; a first frame disposed at one end of the air-flowing channel; a second frame, opposite to the first frame, disposed at another end of the air-flowing channel; at least one driving device disposed on the first frame; a supporting device disposed on the second frame; an active impeller, actuated by the driving device, comprising a first hub, and a plurality of active blades; a passive impeller, disposed on the supporting device, comprising a second hub, and a plurality of first passive blades, wherein when airflow is generated by the active impeller, the passive impeller is propelled by the airflow, wherein the passive impeller further comprises a plurality of second passive blades encircling the first passive blades, wherein the passive impeller further comprises a first airflow guiding ring disposed between the first passive blades and the second passive blades to connect the first passive blades to the second passive blades, wherein the first passive blades are connected to an inner wall of the first airflow guiding ring and the second passive blades are connected to an outer wall of the first airflow guiding ring, wherein an accommodating space is formed by the inner wall of the first airflow guiding ring, and at least a portion of the active blades are inserted into the accommodating space.