Abstract:
The present invention provides an axial fan including a hub adapted for rotation about a central axis and a plurality of blades extending radially outwardly from the hub and arranged about the central axis. Each of the blades includes a root, a tip, a leading edge between the root and the tip, and a trailing edge between the root and the tip. Each of the blades defines a blade radius between the blade tips and the central axis. Each of the blades defines a decreasing skew angle within the outer 20% of the blade radius. The ratio of blade pitch to average blade pitch increases from a lowest value to a highest value within the outer 20% of the blade radius. The highest value is about 30% to about 75% greater than the lowest value.
Abstract:
An appliance, such as a fan, to which it is possible to fit an accessory by using fixing devices, which accessory (17) can be mounted on the appliance so as to change the mode of operation of the appliance. The appliance of the invention is so designed that, by mounting a small accessory, a standard model, e.g. an axial-flow fan, can be converted e.g. into three other generally known fan versions. These are the so-called guide vane, mixed flow and radial flow versions. Traditionally, these are completely separate fans, each requiring separate designing, component manufacture and assembly. In the case of the fan of the invention, these can be achieved with a minimum amount of work. The frame, motor structure and electronics of the fan as well as the frame of the impeller are the same in all these models.
Abstract:
An efficient axial flow fan (2) comprises a central hub (6), a plurality of blades (8), and a band (9), and is designed to operate in a shroud (4) and induce flow through one or more heat exchangers (5) - in an automotive engine cooling assembly, for example. The fan blades (8) have a radial distribution of pitch ratio that provides high efficiency and low noise in the non-uniform flow field created by the heat exchanger(s)(5) and shroud (4). The blade (8) has either no sweep, or is swept backward (i.e. opposite the direction of rotation) in the region between the radial location r/R=0.70 and the tip (r/R-1.00). The blade pitch ratio increases from the radial location r/R=0.85 to a radial location between r/R=0.90 and r/R=0.975, and then decreases to the blade trip.
Abstract translation:有效的轴流风扇(2)包括中心毂(6),多个叶片(8)和带(9),并被设计成在护罩(4)中操作并且引导流过一个或多个热 交换器(5) - 例如在汽车发动机冷却组件中。 风扇叶片(8)具有在由热交换器(5)和护罩(4)产生的非均匀流场中提供高效率和低噪声的俯仰比的径向分布。 在径向位置r / R = 0.70和尖端(r / R-1.00)之间的区域中,刀片(8)没有扫过或向后扫掠(即与旋转方向相反)。 叶片间距比从径向位置r / R = 0.85增加到r / R = 0.90和r / R = 0.975之间的径向位置,然后减小到叶片跳闸。
Abstract:
An efficient axial flow fan comprises a central hub, a plurality of blades, and a band, and is designed to operate in a shroud and induce flow through one or more heat exchangers in an automotive engine cooling assembly, for example. The fan blades have a radial distribution of pitch ratio that provides high efficiency and low noise in the non-uniform flow field created by the heat exchanger(s) and shroud. The blade has either no sweep, or is swept backward (i.e. opposite the direction of rotation) in the region between the radial location r/R=0.70 and the tip (r/R-1.00). The blade pitch ratio increases from the radial location r/R=0.85 to a radial location between r/R=0.90 and r/R=0.975, and then decreases to the blade trip.
Abstract translation:有效的轴流风扇包括中心毂,多个叶片和带,并且被设计成在护罩中操作并且引导流过例如汽车发动机冷却组件中的一个或多个热交换器。 风扇叶片具有俯仰比的径向分布,其在由热交换器和护罩产生的非均匀流场中提供高效率和低噪声。 在径向位置r / R = 0.70和尖端(r / R-1.00)之间的区域中,叶片没有扫过或向后扫掠(即与旋转方向相反)。 叶片间距比从径向位置r / R = 0.85增加到r / R = 0.90和r / R = 0.975之间的径向位置,然后减小到叶片跳闸。
Abstract:
A quiet compact radiator cooling fan (1) having a hub portion (3), which extends radially outwardly and axially from its inlet to its outlet end, a shroud portion (5), which extends radially inwardly and axially adjacent the inlet end and radially outwardly and axially adjacent its outlet end forming a converging annular opening and a plurality of airfoil shaped, forward sweep blades (7) disposed between the hub (3) and shroud (5) which cooperate with the hub (3) and shroud (5) to produce a mixed flow radiator fan (1), which has improved blade loading and aeroacoustic performance producing a quiet and efficient cooling fan (1) for off the road vehicles.
Abstract:
A plastic fan comprising two injection molded parts (20, 60), each of which includes its own hub (22, 62) and a set of blades (24, 64) extending outwardly from the hub to a band (26, 66). The two parts are co-operatively sized and shaped to be assembled into a single operable fan (80) having: 1) a hub comprising the hubs of each of the component parts; 2) the blades of the component parts; and 3) a circumferential band (86) comprising the bands of the component parts. The fan blade separation on each of the fan parts is relatively large, permitting separate injection molding of each part. The resulting fan may be designed to have far greater blade number and blade solidity than would be possible for a fan that is injection molded by standard techniques.
Abstract:
A blade (100) for a vehicle engine-cooling fan assembly having a curved planform and a high-lift airfoil. The planform has a first region adjacent the root of the blade with forward curvature, a second region ajdacent the tip of the blade with backward curvature, and an intermediate region disposed between the first region and the second region with substantially straight curvature. The airfoil has a leading edge (106); a rounded, bulbous nose section (110) adjacent the leading edge (108); a trailing edge; a curved pressure surface (104) extending smoothly and without discontinuity from the nose section to the trailing edge; a curved suction surface (102) extending smoothly and without discontinuity from the nose section (110) to the trailing edge; and a thin, highly cambered aft section (112) formed adjacent the trailing edge (108) and between the pressure surface (104) and the suction surface (102). The nose section (110) has a thickness which is greater than the thickness of the airfoil between the pressure surface (104) and the suction surface (102) and the nose section (110) blends smoothly into the pressure surface (104) and the suction surface (102).