Title:
BACKWARD CENTRIFUGAL FAN
Document Type and Number:
WIPO Patent Application WO/2020/206918
Kind Code:
A1
Abstract:
A backward centrifugal fan, using three-way twisting blades (3). When front edges (31) rotate along a fan axis (L1), a curve (L2) is formed when points on the front edges (31) intersect a meridian plane (A), the distance between each point on the curve (L2) and the fan axis (L1) is a diameter (D0); when viewed from the direction of an air inlet (21), the diameter (D0) gradually decreases from large to small, and then gradually increases from small to large; and the projections formed by rear edges (32) on a cylindrical surface (B) are unfolded in a plane to form another curve (L3), and in the other curve (L3), the coordinates of five curvature inflection points (a, b, c, d, e), i.e., (xa, ya), (xb, yb), (xc, yc), (xd, yd), (xe, ye) satisfy the following relationships: (I) and (II), Y being the total length (Y) of the projections and X being the total width (X).
Inventors:
XU HAIMING (CN)
Application Number:
PCT/CN2019/104618
Publication Date:
October 15, 2020
Filing Date:
September 06, 2019
Export Citation:
Assignee:
ZHONGSHAN EBS TECH CO LTD (CN)
International Classes:
F04D29/30; F04D29/00; F04D29/28; F04D29/66
Foreign References:
| CN109899319A | 2019-06-18 | |||
| CN204371773U | 2015-06-03 | |||
| US20170023001A1 | 2017-01-26 | |||
| JP2016108994A | 2016-06-20 |
Attorney, Agent or Firm:
ZHONGSHAN HANTONG INTELLECTUAL PROPERTY AGENCY(GENERAL PARTNERSHIP) (CN)
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