Abstract: A ventilating system, especially for a motor vehicle air conditioning system, comprises: a wall (4) for mounting an axial fan (2), the latter being equipped with a ring-shaped casing (6), with an axis (X), defined externally by a cylindrical wall (7); an electric motor (11) supported by a plurality of radial spokes (10) connected to the ring-shaped casing (6) and having an impeller (12) at the end of its output shaft; a power cable (14) connected at one end to the motor (11) and connectable at the other end to an electrical power source through a connector (14a). The axial fan (2) is mounted on the wall (4), which delimits a space (5) for containing the air conditioning system, at an air opening (3), in such a way that the impeller (12) faces the inside of the space (5) and the motor (11) faces the outside. The ring-shaped casing (6) comprises means (19) for fastening the cable (14) to its cylindrical outside surface (18) and defining a passage (25) for the cable (14) through the mounting wall (4).

Abstract: An axial fan (1) rotating in a plane (XY) about an axis (2) comprises a central hub (3), a plurality of blades (4), which have a root (5) and a tip (6), the blades (4) being delimited by a convex leading edge (7) and by a concave trailing edge (8), their projections in the fan rotation plane each being formed by circular arc segments; the blades (4) are made from sections with aerodynamic profiles, each with decreasing length and more curved from the perimeter to the hub.

Abstract: The apparatus for forming centrifugal fan impellers (1) comprises a main body (7) equipped with a first bed (8) and a first platform (9), a table (10) for mounting two half-moulds (11, 12), a second platform (17) and a second bed (18), the half-moulds (11, 12) being designed to house two elements (21, 22) for forming the blades (3) of the impeller (1).

Abstract: Disclosed is an axial fan (1) rotating in a plane (XY) about an axis (2) having a central hub (3) and a plurality of blades (4), which have a root (5) and a tip (6). The blades (4) are delimited by a concave leading edge (7), whose projection in the fan plane of rotation (XY) is defined by two circular arc segments, and a convex trailing edge (8), whose projection in the fan plane of rotation (XY) is defined by one circular arc segment. The blades (4) are made from sections with aerodynamic profiles relatively extending in the direction of their centre line, providing good flow rate and air pressure relative to the overall dimensions of the fan.

Abstract: The invention relates to an electric motor for electric fans having a casing with at least a lid with a hermetic seal and a method for assembly of the motor. The motor (1) comprises a casing (2) consisting of a cup-shaped part (5) and a lid (6) and an O-ring seal (7) inserted between them, the seal (7) comprising retaining means (8) so that it remains applied to one of the elements, either the lid (6) or the cup-shaped part (5). The method for assembly includes the steps of inserting an O-ring seal (7) in a seat (10) in the lid (6) or in the cup shaped part (5), the O-ring seal (7) having retaining rings (11); and inserting each retaining ring (11) on a respective fixing pin (15) present in the lid (6) or in the cup-shaped part (5), so that the seal (7) remains positioned in the seat (10) applied to one of the elements, either the lid (6) or the cup-shaped part (5).

Abstract: An axial fan (1) rotating in a plane (XY) about an axis (2) comprises a central hub (3), a plurality of blades (4), which have a root (5) and a tip (6), the blades (4) being delimited by a concave leading edge (7), whose projection in the fan plane of rotation (XY) is defined by two circular arc segments, and a convex trailing edge (8), whose projection in the fan plane of rotation (XY) is defined by one circular arc segment; the blades (4) are made from sections with aerodynamic profiles relatively extending in the direction of their centre line, providing good flow rate and air pressure relative to the overall dimensions of the fan.

Abstract: Described is an axial fan in which an impeller (1) comprises a hub (2), motor-powered so that it rotates about its own central axis (3) and a plurality of blades (5) extending from the hub (2) in directions transversal to the hub (2) axis of rotation (3); the hub having a cup shape and formed by a ring-shaped side wall (7) and a bottom wall (6) which has a plurality of long ribs (20) arranged in a radial direction and extending in height towards the hub (2) cavity, each of the ribs (20) abutting on the internal face of the ring-shaped side wall (7) and delimiting, together with said ring-shaped side wall, a corner area of the bottom wall (6) positioned in front of the rib (20) with reference to the hub (2) direction of rotation (V); each corner area having a through-hole (9) for discharging any debris, in particular water, sand, soil or sludge, from the hub (2) cavity to the outside of the hub (2).

Abstract: The ventilation unit has an electric motor, the output shaft of which is fitted with a fan having a cup-shaped central body and a number of blades. The central body is defined by a base wall, and by an annular wall from whose outer face the blades extend. And the main characteristic of the present invention lies in through windows being formed in the annular wall of the central body to channel out, in use, any condensate formed inside the central body.

Abstract: Method and device (4) for balancing rotors (1), in particular for electric motors, by the addition of material, in which the actual balancing step is carried out by inserting, inside one or more recesses (2) formed in the rotor (1) and designed to seat the rotor winding (3), one or more self-locking balancing devices (4) made of non-ferromagnetic material and having a mass which can be determined beforehand in terms of both its amount and its distribution.

Abstract: The axial flow fan (1) comprises a central hub (3), a plurality of blades (4), each blade (4) having a root (5) and an end (6) and being delimited also by a convex edge (7), whose projection onto the plane of rotation of the fan is defined by a parabolic segment, and by a concave edge (8) whose projection onto the plane of rotation of the fan is defined by circular arc. The blades (4) consist of sections having aerodynamic profiles (18) with a face (18a) comprising at least one initial straight-line segment (t) and a blade angle (&bgr;) that decreases gradually and constantly from the root (5) towards the end (6) of the blade (4) according to a cubic law of variation as a function of the fan radius.

Abstract: The axial flow fan (1; 30) comprises a central hub (3; 33) a plurality of blades (4; 34) which have a root (5; 35), and an end (6; 36). According to one embodiment, the blades (4; 34) are spaced at unequal angles (&thgr;i . . . , n) which can vary in percentage (&thgr;%) from 0.5% to 10%, compared to the configuration with equal spacing angles (&thgr;=) for fans with an equal number of blades. Preferably, the blades (4; 34) are delimited by a convex edge (7; 37), whose projection onto the rotation plane of the fan is defined by a parabolic segment and a concave edge (8; 38) whose projection onto the rotation plane of the fan is defined by a circular arc.

Abstract: A transmission unit comprises a flexible element (1) in the form of a flexible metal wire (6) on which a plurality of small equidistant coaxial cylindrical bodies (8) are fixed; the element (1) passes endlessly about two opposing drive and driven sprocket wheels (2), (3) respectively, and the two outward and return portions of said element (1) are slidingly received in two flexible sheaths (10); the two sprocket wheels (2), (3) are rotatably mounted in respective casings (4), (5) in which the opposing ends of said two flexible sheaths (10) are clamped.