Abstract:
A wheel for a rotating flow machine, comprising a rotor (1) on which a plurality of blades (2) are arranged projecting radially from the rotor (1), with each blade (2) having a root (3) attached to the rotor (1) and a blade top (4). In addition, the wheel comprises a ring (5) arranged concentrically in relation to the rotor (1) outside the blade tops (4) in such a way that the ring (5) and the blades (2) overlap each other when the ring and the blades are viewed in a radial direction, which ring (5) is arranged to be caused to rotate by the blades (2) when the rotor (1) rotates. The extent (9) of the blades (2) in a radial direction and the internal dimension (10) of the ring (5) are matched to each other in such a way that there is a clearance (Δ) between each blade top (4) and the ring (5) in radial direction when the rotor (1) is not rotating.
Abstract:
An impeller (10) is manufactured by providing a mold for one angular segment (12) containing one vane (28) of an impeller and corresponding hub portions (30) and rim portions (26), injection-molding fiber-reinforced polymer composite resin material into the mold to produce a plurality of substantially identical segments, and assembling the segments into an impeller by bonding corresponding mating end surfaces (32, 34, 36) of the hub and rim portions (38, 40, 42) of the segments.
Abstract:
Method for balancing a fan blade wheel (1) comprising a hub (11) and a rim (14) and blades (13) fitted between them, said blade wheel being provided with axial holes (15) arranged in the rim, which holes can be provided with weights (16) for balancing the blade wheel, in which the holes (15) are substantially longer than the weights (16) and in which the weights (16) can be set at desired depths in the holes so as to achieve the required balancing.
Abstract:
A turbomachine for moving air (10) includes a shroud (12) disposed about a longitudinal axis and a rotor assembly (14) mounted for rotation about the longitudinal axis. The rotor assembly (14) has a plurality of blades (18) and tips of the blades (20) are coupled to an annular band (24). The annular band (24) is disposed with respect to the shroud (12) so as to define a gap extending continuously between an outer surface of the annular band (24) and an inner surface of the shroud (12). A seal structure (30) extends from the inner surface (32) of the shroud (12) and into the gap (16) to reduce swirl and minimize air leakage across the gap.
Abstract:
An improvement to forwardly skewed axial fans (20) where blade chamber and rake are coordinated with skew. The blades (5) are characterized in that a line defined by the points of maximum chordwise camber (fmax) as a function of changing radial position (r) is on the leading edge (LE) side of the mid-chord line (MCL) at values of r, toward the root of the blade (5), and is less forwardly skewed than the leading edge (LE), the mid-chord line (MCL), and the trailing edge (TE). The blade (5) is raked forwardly so that the trailing edge (TE) of the blade tip is axially forward of the trailing edge (TE) at the blade root. As a result, the fan (20) produces a flow that is generally in radial equilibrium, having a reduced component of flow normal to the desired axial flow and normal to the tangential flow. The coordinated fan (20) can be combined with a housing/band (62,66) configuration for controlling airflow that recirculates in a channel (68), formed between the band (66) and the housing (62).
Abstract:
A blade (14) for a fan or blower (10) which has an abrupt transition region between an inner blade region which has a negative leading edge sweep angle, and an outer blade region which is highly forwardly swept. The outer blade region is further characterized by a blade chord that increases with increasing radius. The fan provides a low pitch width and superior noise and efficiency trade-offs.
Abstract:
An axial flow ring fan (20) has improved efficiency and reduced noise by making the leading edge (28) of each blade (26) a generally sinusoidal shape and projecting this geometry throughout the blade by imparting fall off to each blade.
Abstract:
L'invention concerne une hélice (3) pour un groupe moto-ventilateur (1) comportant une virole (2) délimitant un passage d'écoulement d'air au travers de laquelle s'étendent les pales (6), l'hélice (3) comportant un moyeu (5) apte à être liée à rotation d'un arbre d'un moteur d'entraînement (4), chaque pale (6) s'étendant radialement du moyeu (5) par leur extrémité intérieure (61), chaque pale comportant un bord d'attaque (62) et un bord de fuite (63). Selon l'invention, l'hélice comprend un moyen de déplacement angulaire (7) des pales par rapport au moyeu de telle sorte que le pas des pales est apte à varier entre une configuration d'ouverture selon laquelle les bords d'attaque et de fuite (62, 63) de deux pales adjacentes sont mutuellement écartés l'un de l'autre et une configuration de fermeture du passage d'air de la virole selon laquelle ces mêmes bords sont rapprochés de telle sorte que les pales forment une paroi d'obturation du passage d'air. L'invention a aussi trait à un groupe moto-ventilateur ayant une telle hélice ainsi qu'un véhicule équipé de ce groupe moto-ventilateur.
Abstract:
A fan includes a main member, vanes, and an acoustic absorption member. The vanes are coupled to and extending outward from the main member. The acoustic absorption member is coupled to each one of the plurality of vanes. The acoustic absorption member and the vanes rotate along with the main member.