Importance

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Abstract

An airflow guiding device for the sound- and pressure-optimized supply of an airflow to an inlet nozzle of a fan, in particular a radial fan, wherein the inlet nozzle has a nozzle input opening with an incident flow angle, the airflow guiding device having: a frame device which extends along a longitudinal axis in an axial direction with a height between an inlet opening, through which the airflow flows into the frame device in an operating state, and an outlet opening, through which the airflow flows out of the frame device in the operating state, wherein the inlet opening has an inlet cross section with a minimum inlet cross-sectional width, and 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, and the frame device comprises a flow duct which connects the inlet opening and the outlet opening in terms of flow, wherein the outlet opening is configured to be connected in terms of flow to the inlet nozzle of the fan in the operating state, characterized in that the height of the frame device according to the following formula h≥(D−d)/(2·tan(β)) corresponds to a ratio of a difference of the minimum inlet cross-sectional width and a diameter of the inlet nozzle and double the value of the tangent of the incident flow angle or is greater than the ratio, and a grid element, which is arranged on the inlet opening.

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First Claim