A noise-reducing axial flow fan

An axial flow fan, noise type technology, applied in non-variable volume pumps, components of pumping devices for elastic fluids, pump components, etc. problem, to achieve the effect of reducing turbulent noise, reducing noise, and reducing shedding vortices

Active Publication Date: 2022-02-18
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Axial flow fans are commonly used in automobile cooling systems. Due to the continuous improvement of automobile power, the heat dissipation requirements are also increasing. In order to achieve higher heat dissipation performance requirements, it is often necessary to increase the fan speed. However, the increase in fan speed greatly increases the Fan noise, the driver is in a high-noise environment for a long time, prone to adverse reactions such as irritability or inattention

Method used

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  • A noise-reducing axial flow fan
  • A noise-reducing axial flow fan
  • A noise-reducing axial flow fan

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Embodiment

[0027] Such as figure 1 As shown, a noise-reducing axial flow fan includes a hub 1, fan blades 2 and an outer ring 3, the hub 1 and the outer ring 3 are coaxially arranged, the top of the fan blade 2 is fixedly connected to the outer ring 3, and the fan The bottom end of the blade 2 is fixedly connected with the hub 1. The blades 2 are arranged radially around the fan rotation axis. The blades 2 include an arc-shaped front edge and a rear edge. Set at least one diversion groove 4, the number, size and distribution of the diversion groove 4 are determined according to the actual cooling fan air volume and noise reduction needs, when multiple diversion grooves 4 are set, the plurality of diversion grooves 4 along the fan blade The front edges of the fan blades 2 are uniformly arranged, and each guide slot 4 guides the airflow from the front edge to the rear edge of the fan blade 2 during the rotation of the fan. The hub 1, the fan blade 2, the outer ring 3 and the guide groove ...

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Abstract

The invention relates to a noise-reducing axial flow fan, which comprises a hub (1), fan blades (2) and an outer ring (3), the hub (1) and the outer ring (3) are arranged coaxially, and the top of the fan blade (2) It is fixedly connected with the outer ring (3), the bottom end of the fan blade (2) is fixedly connected with the hub (1), the fan blades (2) are arranged radially around the fan rotation axis, and the fan blades (2) include arc-shaped front and rear edges, and at least one diversion groove (4) is arranged on the suction surface of each fan blade (2) close to the top of the fan blade (2). When multiple diversion grooves (4) are provided, more The flow guide grooves (4) are evenly arranged along the front edge of the fan blade (2), and each flow guide groove (4) guides the airflow from the front edge to the rear edge of the fan blade (2) during the rotation of the fan. Compared with the prior art, the present invention reduces the turbulent noise generated by the breakage and shedding of the large-scale vortex, and can achieve a better noise reduction effect with little impact on the aerodynamic performance.

Description

technical field [0001] The invention relates to an axial flow fan, in particular to a noise reduction axial flow fan. Background technique [0002] Axial flow fans are commonly used in automobile cooling systems. Due to the continuous improvement of automobile power, the heat dissipation requirements are also increasing. In order to achieve higher heat dissipation performance requirements, it is often necessary to increase the fan speed. However, the increase in fan speed greatly increases the Fan noise, the driver is in a high-noise environment for a long time, prone to adverse reactions such as irritability or inattention. [0003] During the operation of the axial flow fan, the aerodynamic noise generated by the high-speed gas mainly includes narrow-band rotational noise and broadband eddy current noise. During the high-speed rotation of the fan, the blades periodically impact and cut the surrounding air to cause disturbances, resulting in a series of discrete frequency ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/32F04D29/38F04D29/66
CPCF04D29/325F04D29/388F04D29/666F04D29/667
Inventor 郭荣宓恬恬叶胜望蒋燕青吕家明
Owner TONGJI UNIV
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