Suppression of blade passing frequency tone in automotive air handling system
US9624943B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2014 |
| Grant date | Apr 18, 2017 |
| Priority date | — |
| Expiry date | Sep 1, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/667
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A noise tone occurring at a blade passing frequency in a blower for an automotive HVAC system is suppressed. The blower includes a centrifugal fan and a scroll body disposed around the fan. An outlet extends from the scroll body to conduct an air flow from a cutoff point of the scroll body. An inlet is coupled to the scroll body defining an inlet throat comprising an arcuate ring extending between a base and an annular end coaxially disposed over the fan. A partial-perimeter wall extends upstream from the arcuate ring having a height between about 4% and about 6.5% of an inner diameter of the annular end. The wall spans a perimeter portion of the circumference of the throat between about 120° and about 180°. As a result, noise at the blade passing frequency is suppressed without any significant reduction in air flow.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.