Diagonal fan with outlet guide vane device

A diagonal fan comprising an electric motor, a housing, and a diagonal impeller having impeller blades, which is accommodated within the housing and driven via the electric motor, the diagonal flow thereof generated during operation being deflected in an axial flow direction by an inner wall of the housing,

• wherein an outlet guide vane device with a plurality of guide vanes, which are distributed in the circumferential direction, is arranged adjacently to the diagonal impeller in the axial flow direction, the outlet guide vane device homogenizing an airflow generated by the diagonal impeller,
• wherein the guide vanes have a radial extension from a hub region of the outlet guide vane device to the housing,
• wherein the diagonal impeller has a slinger ring that encloses the impeller blades distributed in the circumferential direction and has a flow cross-section that expands outward radially in the axial flow direction and is directed to the inner wall of the housing to establish an outflow angle of the diagonal impeller such that the airflow from the diagonal impeller strikes the inner wall of the housing at a point P at an axial distance K measured from an axial plane at which the slinger ring ends and which is located at a radial outer edge of one of the diagonal impeller blades along an axial plane of the diagonal fan such that the diagonal impeller blades are enclosed within the slinger ring, and the outlet guide vane device is arranged at an axial distance H measured from the axial plane at which the slinger ring ends such that 0.75≤K/H≤1.25 so that the airflow is deflected into an axial flow direction at the inner wall of the housing and conveyed to the outlet guide vane device,
• wherein the outlet guide vane device has a protective grille extending over a blow-out portion of the diagonal fan,
• wherein the outlet guide vane device and the protective grille are integral and formed as a single part with the housing,
• wherein the guide vanes of the outlet guide vane device, and the impeller blades, are both curved in an axial cross-section thereof in a shape of an arc but in opposite circumferential directions with respect to each other,
• wherein the protective grille has a plurality of annular webs arranged coaxially as relates to each other, each of the plurality of annular webs forming web surfaces that extend parallel to the axial flow direction and are opposite one another, and the plurality of annular webs extending from corresponding positions along a radial length of each of the guide vanes, and
• wherein each of the plurality of annular webs is formed to protrude axially along a leading edge of the respective guide vanes.