Axial-flow fan and projector provided with the same
AssigneeSeiko Epson Corporation
InventorsMotoyuki Fujimori, Masakazu Kitamura, Toshiaki Hashizume
Life of this patent
Estimating the term…
Abstract
An axial-flow fan has a plurality of main fins (702), and auxiliary fins (703) provided between the main fins (702), where the position of a front end of the auxiliary fin (703) relative to X axis and the position of a front end of the main fin (702) adjoining the auxiliary fin in reverse-rotary direction are aligned, the height of the auxiliary fin (703) is approximately three fourths of the height of the main fin (702), and the cross sections of the main fin (702) and the auxiliary fin (703) taken along the axial direction of the main shaft are streamlined.
Claims38
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.
Dependencies are inferred from the claim text.