High efficiency, low-noise, axial fan assembly
US5577888A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1995 |
| Grant date | Nov 26, 1996 |
| Priority date | — |
| Expiry date | Jun 23, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/325
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A high efficiency fan and stator arrangement for generating an airflow through a heat exchanger is disclosed herein. The fan is rotated about its rotational axis by an electric motor, and includes eight blades extending radially from a hub to a circular band. Each fan blade has a stagger angle and chord lengths which vary along the span of the blades. Each fan blade also includes a trailing edge having a flat surface extending along the edge. The flat surfaces of each fan blade are coincident with a plane perpendicular to the rotational axis. The fan produces an airflow when rotated about the rotational axis, wherein a component of the airflow occurs at a first angle to the rotational axis. The fan support has a central bearing support and twenty elongated airfoils extending radially outward from the bearing support. Each airfoil has substantially the same length as the fan blades and includes a curved airflow guiding surface having a leading edge and a trailing edge downstream from the leading edge. The curve of the guiding surface is a generally circular arc with a tangent to the guiding surface at the leading edge substantially at the first angle to the rotational axis, and a ta…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.