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Vane wheel of low-noise scavenger fan

A ventilation fan, low-noise technology, applied in the components of the pumping device for elastic fluids, non-variable-capacity pumps, machines/engines, etc. It is not a big problem, and achieves the effect of low noise, avoiding eddy current and avoiding disturbance.

Inactive Publication Date: 2002-05-22
广东正野电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The blades of this ventilation fan are slightly improved on the prior art in terms of the small circular arc at the leading edge of the blades, but they still belong to the slightly arc-shaped category; the contact between the blades and the airflow does not conform to the law of air flow. There is little improvement on the defects of existing technologies, and the defects of low efficiency and high noise are still not resolved
At present, there is no excellent blade design that maximizes the working efficiency of the ventilation fan, increases the working capacity of the ventilation fan, and especially effectively reduces the noise generated by the blade disturbance based on the principle of aerodynamics.

Method used

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  • Vane wheel of low-noise scavenger fan
  • Vane wheel of low-noise scavenger fan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Figure 1, figure 2 As shown, a cross-shaped blade frame 2 is made of a steel plate, and its center is a shaft sleeve 3. On the four arms of the blade frame 2, four blades 1 are respectively connected or welded by fasteners or rivets, each The blades are all twisted and forward-leaning, and adopt variable circulation design. That is, the leaf surface distribution on the blade tends to be in front of the direction of rotation and toward the outer edge. From the root of the blade to its outer edge, the area of ​​each part of the leaf surface gradually increases, and its distribution is inclined toward the leading edge. The different chord lengths b on the leaf surface corresponding to different primitive-level radii r increase with the increase of r. As for the different installation angle α of the blade surface, it varies with the radius r of different primitives, and the blade surface is distorted. As r increases, the installation angle α tends to decrease. The relevan...

Embodiment 2

[0036] As shown in Figure 3, Figure 4 Shown, with embodiment 1, just, make the whole impeller of 5 blades with engineering plastics, 5 blades 1 are directly connected on the hub disc as blade frame 2, and axle sleeve 3 is arranged in the center. The arrangement of each blade 1 also adopts a twisted forward-leaning design. The relevant parameters are listed in the table below. All the other are with embodiment 1.

[0037] parameters

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Abstract

The blade wheel of low-noise air-changing fan comprises several blades, blade frame and axle sleeve, the number of blades is 2-10, optimum is 3-5, every blade is twisted and foreraked, its blade surface distributino is not symmetrical, the direction deflected to rotation is forward and deflected toward outer edge, the mounting angle alpha on blade surface can be reduced with the incrmeent of primitive-level radius r, the blade is twisted, and the chord b or r on the blade surface is progressively increased, so it is deflected toward outer edge. The front end of the blade possesses a triangle-lire flange formed from three circular arcs. Said blade wheel possesses the advantages of high efficiency, large flow, stable operation and low noise, it is applicable to various air-changing fans.

Description

Technical field: [0001] The invention relates to an impeller of a ventilating fan, in particular to an impeller of a low-noise ventilating fan. Background technique: [0002] The blades of the impeller of the existing ventilation fan are basically flat or slightly arc-shaped. Among the arc-shaped blades, the leading edge of the blade is basically a large arc shape, and the distribution of the blade surfaces is axisymmetric. The installation angle of the blade in the inclined blade does not change from the root of the impeller to the outer edge, and adopts a uniform angle, that is, there is no distortion. The arrangement of the blades does not conform to the law of air flow, the work efficiency of energy conversion is low, and the noise generated by the friction between the blades and the air is also large. At present, high noise is a common problem existing in existing industrial ventilation fans. Generally, the noise level is 60-80 decibels. [0003] Chinese patent ZL932...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/34
Inventor 吕植良谭锦光余炳华
Owner 广东正野电器有限公司
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