Fan impeller of axial-flow ventilator and axial-flow ventilator

A fan impeller, axial flow technology, applied in the direction of axial flow pumps, machines/engines, components of pumping devices for elastic fluids, etc., to achieve the effect of reducing noise

Inactive Publication Date: 2020-09-11
EBM PAPST MULFINGEN GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem is noise generation due to vortex formation, especially in installation conditions where the inflow and / or inflow are disturbed

Method used

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  • Fan impeller of axial-flow ventilator and axial-flow ventilator
  • Fan impeller of axial-flow ventilator and axial-flow ventilator
  • Fan impeller of axial-flow ventilator and axial-flow ventilator

Examples

Experimental program
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Effect test

Embodiment Construction

[0031] Figure 1-5 An exemplary embodiment of a fan wheel 1 of an axial fan is shown, in which five identical fan wheel blades 2 extend radially outward from a hub 17 and form a blade ring around an axis of rotation RA. The number of fan wheel blades 2 is set at five only by way of example, but a greater or lesser number can also be used in alternative embodiments.

[0032] Each fan wheel blade 2 has a blade trailing edge 8 , a blade leading edge 9 and a freely terminating radial blade edge 5 . The individual fan wheel blades 2 are only connected together via the hub 17 . The blade fronts 8 are convexly rounded in a circumferential direction and each define an arcuate curve, the blade fronts 9 extending radially outward in a substantially straight line from the hub 17 . Such as figure 2 As can be clearly seen in , the fan wheel blades 2 are curved and inclined relative to the plane of rotation RE. Circumferentially oriented reinforcing ribs 25 are formed on the respective...

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PUM

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Abstract

The invention relates to a fan impeller (1) of an axial flow ventilator. The fan impeller is provided with a plurality of fan impeller blades (2) which are arranged around a rotating shaft (RA) to form a blade ring. Wherein at least one of the fan impeller blades (2) has a radially inner section (3) and a blade edge section (4) which is directly connected to the inner section (3) and adjoins the blade edge, wherein the at least one fan impeller blade (2) has a local projection (6) by radial extension of the blade edge section (4); and the projection (6) is formed in an extension of the chord length of the fan impeller blade (2) and locally increases the fan impeller blade (2) in the blade edge section (4), wherein an average angle of attack (alpha) of the fan impeller blades (2) with respect to a plane of rotation (RE) of the fan impeller is greater than an average angle of attack (beta) of the projection (6) with respect to the plane of rotation (RE). Such a fan wheel (1) ensures thatthe sound level generated during operation is reduced under disturbed installation conditions.

Description

technical field [0001] The invention relates to a fan wheel of an axial fan, which has a plurality of fan wheel blades arranged on a blade ring around a rotation axis. Background technique [0002] Fan wheels of the same type for axial flow fans generating an axial flow have been known for a long time and generally comprise a plurality of fan wheel blades which extend radially outward from the hub and are arranged in a blade ring middle. [0003] The problem is that noise can be generated due to vortex formation, especially in installation conditions where the inflow and / or inflow are disturbed. Contents of the invention [0004] It is therefore an object of the present invention to provide a fan impeller which, in particular in such disturbed installation situations, ensures a reduced sound level generated during operation. [0005] The solution of the present invention to achieve the above object is characterized by the following aspects. [0006] According to the inv...

Claims

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Application Information

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IPC IPC(8): F04D29/38
CPCF04D29/384F04D29/388F04D29/681F05D2240/304F05D2240/307F04D19/002F04D29/542F05B2240/301
Inventor O·哈弗T·皮萨尔奇克
Owner EBM PAPST MULFINGEN GMBH & CO KG
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