Patent ID: 7008180
Filing Date: 2006-03-07
Classification: F04D,G03B

Abstract:
1. An axial-flow fan, comprising: a main shaft; a plurality of main fins provided on the outer circumference of the main shaft, the main fins being inclined relative to an axial direction of the main shaft, where a front end in a rotary direction of the main fins is located on an intake side and a rear end in the rotary direction of the main fins is located on an exhaust side when the axial-flow fan transfers air; and an auxiliary fin provided between mutually adjoining main fins, wherein the height of the auxiliary fin from the front end to the rear end in the rotary direction of the auxiliary fin along the axial direction of the main shaft is not less than half and not more than four fifths of the height of the main fins from the front end to the rear end of the main fins in the rotary direction along the axial direction of the main shaft, and wherein, when the main fins are arranged by a pitch W, the front end in the rotary direction of the auxiliary fin is located within −⅛×W to +⅛×W along the rotary direction from the front end in the rotary direction of the main fins adjoining in a reverse rotary direction.