发明名称 |
Suppression of blade passing frequency tone in automotive air handling system |
摘要 |
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. |
申请公布号 |
US9624943(B2) |
申请公布日期 |
2017.04.18 |
申请号 |
US201414150036 |
申请日期 |
2014.01.08 |
申请人 |
FORD GLOBAL TECHNOLOGIES, LLC |
发明人 |
Jones Curtis M.;Liu Zhengyu;Azar John |
分类号 |
F04D17/10;F04D29/42 |
主分类号 |
F04D17/10 |
代理机构 |
MacMillan, Sobanski & Todd, LLC |
代理人 |
Chea Vichit;MacMillan, Sobanski & Todd, LLC |
主权项 |
1. A blower for an automotive HVAC system comprising:
a centrifugal fan; a scroll body disposed around the fan; an outlet extending from the scroll body to conduct an air flow from a cutoff point of the scroll body; an inlet 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; and a partial-perimeter wall extending upstream from the arcuate ring having a height between about 4% and about 6.5% of an inner diameter of the annular end, wherein the partial-perimeter wall spans a perimeter portion of the circumference of the throat and is between about 120° and about 180° in length, wherein the partial-perimeter wall has a circumferential center radially aligned with the cutoff point. |
地址 |
Dearborn MI US |