Abstract: An impeller with impeller blades arranged around a rotational axis of the impeller. Integral, seamless, and notch-free transitions are formed into a disc body on at least one of their two axial sides. The disc body connects the impeller blades in the circumferential direction around the rotational axis. Covering portions, between the impeller blades, determine the flow channels of the impeller.

Abstract: A fan wheel (1) has a bottom disc (4), a cover disc (3) and impeller blades (2) arranged around a rotation axis (RA) of the fan wheel (1). The blades, in each case, extend over a blade length from a blade leading edge (5) to a blade trailing edge (6). The impeller blades (2) are divided into a front section (10), rear section (12) and transition section (11). The front section (10), extends proceeding from the blade leading edge (5) in the direction of the blade trailing edge (6). The rear section (12) extends proceeding from the blade trailing edge (6), in the direction of the blade leading edge (5). The transition section (11) forms a transition between the front section (10) and the rear section (12). The impeller blades (2) are formed with opposite curvature in the course from the bottom disc (4) to the cover disc (3) in the front section (10) and the rear section (12).

Abstract: A diagonal fan wheel (1) has a cover disk (2) and a bottom disk (3). A plurality of three-dimensionally curved blades (S) are arranged between the cover disk (2) and bottom disk (3). The blades (S) are connected to the cover disk (2) and bottom disk (3) in a materially bonded manner.

Abstract: The present disclosure relates to a radial fan wheel having a plurality of fan wheel blades arranged in a blade ring and at least one plate that, at least in sections, covers the fan wheel blades axially on the front side, wherein two adjacent fan wheel blades form a blade channel therebetween, the flow cross section of which is axially limited by the plate; an axial width of the blade channel increases to a maximum (M) at least along an outer periphery of the radial fan wheel starting from a suction side (S) of a fan wheel blade limiting the blade channel in the direction of a pressure side (D) of the adjacent fan wheel blade limiting the blade channel; wherein the maximum lies on a radial section of the fan wheel, which radial section lies between 55 and 95% of the distance between the suction side (S) of the fan wheel blade limiting the blade channel and the pressure side (D) of the adjacent fan wheel blade limiting the blade channel such that the plate, when viewed in the circumferential direction, has an

Abstract: A diagonal fan has an electric motor, a housing, and a diagonal impeller received in the housing. The diagonal fan is driven via the electric motor. The fan generates a diagonal flow during operation that is deflected in an axial flow direction by an inner wall of the housing. An outlet guide vane device is arranged adjacent to the diagonal impeller when viewed in the axial flow direction. The outlet guide vane device has a plurality of guide vanes that are distributed in a circumferential direction. The outlet guide vane device homogenizes an airflow generated by the diagonal impeller. The device has an air outlet with a specified outlet diameter B. The diagonal fan extends over a total axial length E. The ratio of the total axial length E to the outlet diameter B is configured such that 0.3?E/B?0.6.

Abstract: The invention relates to a fan (1) comprising an electronic system on a printed circuit board (2) and a cover (10) arranged above the electronic system, which is embodied both as an active cooling body and a passive cooling body, wherein the cover (10) is designed substantially as a flat covering element consisting of a thin-walled plastic and has a form with a surface (11) which is effective for the cooling of the electronic system arranged beneath the cover (10), said surface being larger than the projected base area of the cover (10) by a factor of at least 2.

Abstract: The present disclosure relates to a current rectifier for being arranged on the suction area of a ventilator, with an axial initial flow side and an axial exit flow side, wherein the current rectifier comprises several crossing struts formed by at least one circumferential strut and by at least one radial strut, and a pressure measuring conduit is constructed at least in one of the struts and which comprises at least one opening facing the exit flow side, and wherein the pressure measuring conduit comprises a measuring opening for being connected to a measuring line for the connection to a pressure sensor or a pressure sensor is integrated in the pressure measuring conduit.

Abstract: The disclosure relates to a retaining device for an anemometer, designed for use on a fan housing of a fan, wherein the retaining device is designed as a flow conditioner having a plurality of axial flow channels divided into a honeycomb structure by an arrangement of bars, and wherein the retaining device has retaining means, by means of which the anemometer can be fastened to the retaining device such that the former axially adjoins the flow channels.

Abstract: A radial fan has a housing with a motor-drivable fan wheel. The fan wheel generates an air volume flow during operation. The housing has a blow-out portion (4) with an impeller (5). The impeller (5) has a plurality of impeller blades (7) spaced apart in the circumferential direction. The impeller (5) is driven by the air volume flow generated by the fan wheel.

Abstract: Diagonal fan having a fan housing, within which an external-rotor motor and an impeller are accommodated, wherein the external-rotor motor has a stator and a rotor which at least partly surrounds the stator, and an axial flow duct runs between the fan housing and the external-rotor motor as far as a discharge opening, surrounding the external-rotor motor, of the diagonal fan, through which duct, during operation, air which is drawn in by means of the impeller can be conveyed to the discharge opening, and wherein the impeller is integrated in the rotor.

Abstract: The disclosure relates to a flow-conducting grille for arranging on the suction side of a fan, with a grille web structure which comprises radial webs spaced apart in the circumferential direction and coaxial circumferential webs spaced apart in the radial direction, wherein the radial webs of at least one quadrant of the flow-conducting grille are curved in each case over their radial extension, viewed in the circumferential direction, towards a predetermined radial plane extending from a central axis of the flow conducting grille.

Abstract: The invention relates to a flow rectifier for an axial fan as well as to an axial fan having a flow rectifier. A flow rectifier according to the invention for an axial fan with a hub and at least one vane is characterized in that the at least one vane can be operatively connected to the hub so as to be detachable. Since the vane and the hub can be connected so as to be detachable, the flow rectifier has a modular structure.

Abstract: A spiral housing of a radial fan has a flow cross-sectional area which, starting from a housing tongue, increases in the circumferential direction, around a fan impeller which can be arranged on an axial central axis. The cross-sectional area is determined via a contour of at least one axial side part of the spiral housing. The one axial side part has an axial suction opening with an opening edge section surrounding the suction opening, which is directly adjoined, viewed in the radial direction, by a transition section extending in the circumferential direction. The transition section, in a starting section which extends from the housing tongue in the circumferential direction over a predetermined angle, is spaced apart in the axial direction relative to the opening edge section and has a course which increases the flow cross section in the circumferential direction until axial surfaces of the opening edge section and of the transition section extend in the same plane.

Abstract: The invention relates to a ventilator wheel which is produced in the form of a radial or a diagonal ventilator wheel, and comprises a bottom disc and a plurality of ventilator blades arranged, on said bottom disc, so as to be distributed about an axial rotational axis, said bottom disc comprising a circumferential radial outer edge section that, when viewed in cross-section, extends in a curved shape in at least some sections and thus forms an elliptical transition of said bottom disc from a radial extension into an axial extension.