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Skewed axial fan assembly

A fan assembly, axial-flow technology, applied in the field of free-tip axial-flow fans, can solve problems such as skew distribution that does not give minimal radial deflection

Active Publication Date: 2012-11-14
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While U.S. Patent No. 6,595,744 also describes a fan geometry that minimizes axial deflection at the tip of a blade for a given degree of skew, said patent does not address minimizing radial deflection. normalized skewness distribution

Method used

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  • Skewed axial fan assembly
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  • Skewed axial fan assembly

Examples

Experimental program
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Embodiment Construction

[0043] Figure 1a There is shown a free-tipped axial fan assembly 1 configured for use as an engine cooling fan assembly and mounted adjacent to a set of heat exchangers 2 . The set of heat exchangers typically includes a radiator 3 to cool the internal combustion engine, but vehicles powered by alternative sources of energy can include heat exchangers to cool batteries, electric motors and the like. The cover 4 guides cooling air from the radiator 3 to the fan 5 . The fan 5 rotates about an axis 6 and comprises a hub 7 and generally radially extending blades 8 . One of the plurality of blades 8 is shown in a swept diagram, where the axial width is represented as a function of radius. The end of the blade 8 adjacent to the hub 7 is the blade root 9 and the outermost end of the blade 8 is the blade tip 10a. The blade tip 10a is surrounded by a shroud barrel 11a. The tip spacing 12a provides the running clearance between the blade tip 10a and the shroud barrel 11a.

[0044]...

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PUM

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Abstract

A free-tipped axial fan assembly has a skew distribution which reduces fan noise while minimizing radial tip deflection. The difference between the maximum value of leading-edge skew and the value of leading-edge skew at the fan radius is at least 10 degrees. The ratio of the difference of the leading-edge skew between the maximum value and the value at the fan radius to the difference of the trailing-edge skew between the maximum value and the value at the fan radius is at least 2.5.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 61 / 312,487, filed March 10, 2010, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates generally to free-tipped axial fans, and more particularly to free-tipped fans useful as automotive engine cooling fans. Background technique [0004] Engine cooling fans are used in motor vehicles to move air across a set of heat exchangers, which typically include a radiator to cool the internal combustion engine, a condenser for an air conditioner, and possibly additional heat exchangers. These fans are generally enclosed by a shroud that serves to reduce backflow and direct air between the heat exchanger and the fans. [0005] The cover plenum (ie the part of the cover adjacent to the heat exchanger) is generally rectangular and the gas flow to the fan is not axisymmetric. Radiators usu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/16F04D29/58F04D29/66
CPCY10S416/02Y10S416/05F04D29/386F04D29/164F04D19/00F04D29/32F04D29/38F04D29/54
Inventor R·J·范霍滕
Owner ROBERT BOSCH GMBH