Abstract: A method for actively monitoring sound emissions of turbomachinery, in particular turbomachinery which has an electric motor, preferably a ventilator or a turbomachine. A sound signal, which is produced by superimposing the sound emission of the turbomachinery with at least one counter sound signal, is captured by at least one receiver at at least one receiver position and is transmitted to a control unit, wherein the control unit has an artificial intelligence, and a control signal is generated by the artificial intelligence for at least one actuator while taking into consideration the sound signal such that the actuator generates a counter sound signal that interacts with the sound emission of the turbomachinery such that a sound load at least in the region of the receiver position or the receiver positions is reduced.

Abstract: A fan, in particular an axial or diagonal fan, comprising a housing and an impeller arranged therein and driven by an electric motor and having vanes extending between a hub ring and a cover ring, wherein a step diffuser is formed in the form of an abrupt expansion of the flow cross-section in the direction of flow downstream of the impeller and after exiting the region of the cover ring.

Abstract: An axial, diagonal or radial fan having an impeller driven by an electric external rotor motor, wherein the impeller comprises a hub ring carrying blades and which is connected in a rotationally fixed manner to the rotor, and wherein a hub contour is provided on the inflow side on the hub ring, which hub contour has a flow-guiding outer surface and a central opening adjoining the outer surface radially inwards with an inner surface directed towards the rotor.

Abstract: The present disclosure relates to a method for quantitatively determining the current conveyed volumetric flow rate or another operating-point-dependent variable of a fan which comprises a motor-driven impeller, which method uses a motor-internal variable and a motor-external variable, from which the conveyed volumetric flow rate or another operating-point-dependent variable is directly or indirectly calculated or determined by means of an algorithm.

Abstract: A fan (1), more particularly a radial or diagonal fan, comprising a motor (4), an impeller (3) driven in rotation by the motor (4), an inlet nozzle (5) and a nozzle plate (2) extending around the inlet nozzle (5), wherein the impeller (3) essentially consists of a base disk (10), a cover disk (8) and several wings (9) extending between them, the nozzle plate (2) has an edge folded towards the pressure side and the cover disk (8) is rounded on its outer edge towards the suction side, and wherein the fold (6) of the nozzle plate (2) and the rounding of the cover disk (8) are shaped and dimensioned in such a way that the outflow from the impeller (3) close to the cover disk interacts with the bend of the nozzle plate (2).

Abstract: A fan with an impeller having, in an embodiment, backward-curved blades and having a scroll housing, the flow channel of which is formed by an inner spiral contour of the housing, the flow channel guiding the air conveyed by the impeller towards an outlet wherein the spiral contour with its local pitch angles is adapted to the outlet angle from the impeller.

Abstract: A fan is described, with the aid of which a volume flow and/or a mass flow of a medium moved by the fan (1) can be determined. This fan comprises an electric motor (2) and an impeller (3) driven by the electric motor (2), wherein the impeller (3) moves a gaseous medium in a media flow from an inflow side (5) to an outflow side (7). The fan additionally comprises a pressure sensor system, a speed ascertainment system, and an evaluation unit. The pressure sensor system is designed to ascertain an actual pressure difference (?p*) between a first region (10) and a second region (13), wherein the first region (10) and/or the second region (13) is/are formed in the electric motor (2), wherein a pressure (pA) prevails in the first region (10), which corresponds to a pressure (p1) present on the inflow side, wherein a pressure (pB) prevails in the second region (13), which corresponds to a pressure (p2) present on the outflow side.

Abstract: A fan having an impeller comprising blades, an electric motor driving the impeller, and a scroll housing, wherein a flow channel is formed by the inner contour of the scroll housing, wherein an inlet nozzle, designed as a rotating body in an embodiment, is provided on the inflow side, and wherein the flow channel guides the air aspirated by the inlet nozzle via the impeller to an outlet, is characterized in that the inlet nozzle is surrounded by an inflow area having an inflow surface, which expands the inlet nozzle essentially in the radial direction, i.e., transversely to the impeller axis. A scroll housing is designed accordingly.

Abstract: A housing for a fan, in an embodiment for an axial or diagonal fan, with the fan including an impeller and at least one flow-through region, wherein immediately downstream of the impeller or the blades of the impeller in an outer region of the housing and thus in the flow-through region, multiple individual, free-standing guide elements are provided. A fan includes a corresponding housing.

Abstract: A fan, in particular axial fan and preferably backward-curved radial fan, having an impeller equipped with blades, an electric motor for rotating the impeller and a device for determining the airflow when the impeller is rotating. The device for determining the airflow includes a volume flow measuring wheel arranged in the air flow, which is arranged upstream of the impeller on the inflow side. The air volume flow is calculated or derived from the rotational speed of the volume flow measuring wheel.

Abstract: Disclosed fans include an impeller and a guide device. The impeller is configured to generate an air flow path having an upstream direction and a downstream direction, and the guide device is positioned in the flow path located on an upstream side of the impeller. The guide device is configured as an intake grid having flat webs having branches and node points, and the webs form a plurality of flow channels configured as grid cells. The webs extend either between two branches or between one branch and a border area and each branch may include three webs that meet. In one configuration, flow channels include channels having a honeycomb cross section. In other example, flow channels may have a rectangular, pentagonal, and/or hexagonal shape. The fan further includes an inlet nozzle having an inlet area, and the guide device is located upstream from the inlet area of the inlet nozzle.

Abstract: Disclosed embodiments relate to a housing for a fan that is constructed by cutting, bending, and/or folding a single sheet of metal. A disclosed housing is configured to house a fan having a motor that is configured to rotate around an axial direction. The housing includes a first plate that is oriented in a plane that is perpendicular to the axial direction and substantially flat wall regions extending away from the first plate so as to be non-coplanar with the first plate. The housing further includes a second plate having an air intake nozzle, the second plate oriented perpendicularly to the axial direction and thereby oriented parallel to the first plate and located a first distance along the axial direction from the first plate, with the first distance being determined by a length of the wall regions. The wall regions are configured to include air flow openings.

Abstract: A support module for a fan, which includes a motor and a fan impeller driven in rotation by the motor, in an embodiment for a radial or diagonal fan, for fastening the fan impeller between a nozzle plate on the inflow side and a base plate lying opposite the nozzle plate at a distance, wherein the motor is non-rotatably mounted with the fan impeller on or in the base plate and is held on the nozzle plate by means of struts extending between the base plate and the nozzle plate characterized in that the struts are adjusted to the flow exiting the fan impeller with a compact design. A fan is provided with a corresponding support module.

Abstract: A housing for a fan, in an embodiment for an axial or diagonal fan, with the fan including an impeller and at least one flow-through region, wherein immediately downstream of the impeller or the blades of the impeller in an outer region of the housing and thus in the flow-through region, multiple individual, free-standing guide elements are provided. A fan includes a corresponding housing.

Abstract: A fan, in particular axial fan and preferably backward-curved radial fan, having an impeller equipped with blades, an electric motor for rotating the impeller and a device for determining the airflow when the impeller is rotating. The device for determining the airflow includes a volume flow measuring wheel arranged in the air flow, which is arranged upstream of the impeller on the inflow side. The air volume flow is calculated or derived from the rotational speed of the volume flow measuring wheel.

Abstract: Method for the quantitative determination of a current operating state-dependent variable, for example the pressure increase, of a fan, wherein, given a known volume or mass flow of the fan, a current operating state-dependent variable is determined via its rotational speed.

Abstract: A fan with an impeller having, in an embodiment, backward-curved blades and having a scroll housing, the flow channel of which is formed by an inner spiral contour of the housing, the flow channel guiding the air conveyed by the impeller towards an outlet wherein the spiral contour with its local pitch angles is adapted to the outlet angle from the impeller.

Abstract: A fan is described, with the aid of which a volume flow and/or a mass flow of a medium moved by the fan (1) can be determined. This fan comprises an electric motor (2) and an impeller (3) driven by the electric motor (2), wherein the impeller (3) moves a gaseous medium in a media flow from an inflow side (5) to an outflow side (7). The fan additionally comprises a pressure sensor system, a speed ascertainment system, and an evaluation unit. The pressure sensor system is designed to ascertain an actual pressure difference (?p*) between a first region (10) and a second region (13), wherein the first region (10) and/or the second region (13) is/are formed in the electric motor (2), wherein a pressure (pA) prevails in the first region (10), which corresponds to a pressure (p1) present on the inflow side, wherein a pressure (pB) prevails in the second region (13), which corresponds to a pressure (p2) present on the outflow side.

Abstract: A fan wheel for a fan is equipped with at least two fan blades with a wavy design. A fan has at least one such fan wheel. A system has at least one fan with such a fan wheel.

Abstract: A disclosed fan system includes a housing having side walls, an inflow side, and an outflow side; a fan secured in the housing by a mounting; and a backflow blocker mounted to the side walls within the housing on the outflow side of the housing partially blocking a cross-sectional area of the outflow side. The backflow blocker is positioned approximately centrally in a flow path of the housing and is configured to block part of an airflow cross section such that, between side walls of the housing and side walls of the backflow blocker, an annular duct is formed as an air passage. Further, the backflow blocker has a thickness that is greater than 5% of a width of the housing, and is less than 20% of an axial design height of the fan system.