US 11,988,186 B2
Airflow guiding device for the sound- and pressure-optimized supply of an airflow to an inlet nozzle of a fan, fan device, generator, and wind power installation
Malte Koppe, Bremen (DE); Henning Küwen, Oldenburg (DE); and Sarah Valentiner, Hamburg (DE)
Assigned to Wobben Properties GmbH, Aurich (DE)
Filed by Wobben Properties GmbH, Aurich (DE)
Filed on Oct. 24, 2022, as Appl. No. 17/972,407.
Claims priority of application No. 21205212 (EP), filed on Oct. 28, 2021.
Prior Publication US 2023/0132708 A1, May 4, 2023
Int. Cl. F03D 1/04 (2006.01)
CPC F03D 1/04 (2013.01) [F05B 2240/123 (2013.01); F05B 2250/121 (2013.01); F05B 2260/96 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An airflow guiding device for reducing sound and pressure supply of an airflow to an inlet nozzle of a fan, wherein the inlet nozzle has a nozzle input opening with an incident flow angle, the airflow guiding device comprising:
a frame device extending along a longitudinal axis in an axial direction with a height between an inlet opening, through which the airflow flows into the frame device during operation of the airflow guiding device, and an outlet opening, through which the airflow flows out of the frame device during operation of the airflow guiding device, wherein:
the inlet opening has an inlet cross section with a minimum inlet cross-sectional width,
the outlet opening has an outlet cross section with a minimum outlet cross-sectional width which corresponds to the minimum inlet cross-sectional width or which is smaller than the minimum inlet cross-sectional width,
the frame device comprises a flow duct which fluidly connects the inlet opening and the outlet opening,
the outlet opening is designed to be fluidly connected to the inlet nozzle of the fan during operation of the airflow guiding device,
the height (h) of the frame device according to the following formula:

OG Complex Work Unit Math
corresponds to a ratio of a difference of the minimum inlet cross-sectional width (D) and a diameter of the inlet nozzle (d) and double the value of the tangent of the incident flow angle (β) or is greater than the ratio, and
a grid element is arranged on the inlet opening.