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Blade special for axial-flow fan

A technology of axial flow fans and blades, which is applied in the direction of mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems of failure to improve fan efficiency, inconvenient use, loud noise, etc., and improve efficiency and improve efficiency , Noise reduction effect

Pending Publication Date: 2017-03-29
SHAANXI JINYI VENTILATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing design, although there are many airfoil blades, the efficiency of using them in the fan has not been improved, the noise is large, and it consumes electricity, which is very inconvenient to use

Method used

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  • Blade special for axial-flow fan
  • Blade special for axial-flow fan
  • Blade special for axial-flow fan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Refer to attached Figure 1-3 As shown, a special blade for an axial flow fan provided by the present invention includes a blade surface 1 and a petiole 2. The blade surface 1 is composed of a number of arc curved surfaces in sequence, and each arc curved surface has a corresponding chord length. The chord lengths of several circular arc surfaces decrease successively, and the circular arc surface with the longest chord length is connected with the petiole.

[0030] Wherein, the arc surface is specifically an airfoil section.

[0031] In the above-mentioned blade surface 1, the overall radian curve of the blade surface 1 is first long and then short and then long. To a certain extent, and then longer. A plurality of arc-curved surfaces form a relatively twisted blade surface 1 .

[0032] Wherein the petiole 2 is a trapezoidal structure.

[0033] In the above embodiment, due to the isolated airfoil method as the basis, the entire blade surface maintains a relatively ...

Embodiment 2

[0035] Refer to attached Figure 4-6 As shown, a special blade for an axial flow fan includes a blade surface 1 and a petiole 2. The blade surface 1 is composed of seven arc-shaped surfaces sequentially, including a first arc-shaped surface 101 and a second arc-shaped surface 102. , the third arc surface 103, the fourth arc surface 104, the fifth arc surface 105, the sixth arc surface 106 and the seventh arc surface 107, each arc surface has a corresponding chord length, and several arcs The chord lengths of the curved surfaces decrease successively, and the arc surface with the longest chord length is connected to the petiole 2 .

[0036] Wherein the petiole 2 is a cylindrical structure.

[0037] The arc surface is specifically an airfoil section.

[0038] During use, the chord lengths of the seven-segment arc surfaces decrease successively, and the ratio of the chord lengths of the seven-segment arc surfaces is: 206:190:180:170:166:162:160.

[0039] Wherein, the blade sur...

Embodiment 3

[0046] When the present invention is used in practice, different chord lengths and the like need to be designed according to the specifications of different models. The following table shows the blade specifications of 14 different models. The specific table 1 is the chord length data, and the table 2 is the maximum thickness (mm) and installation angle of the section airfoil, specifically:

[0047] Table 1

[0048]

[0049] Table 2

[0050]

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PUM

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Abstract

The invention discloses a blade special for an axial-flow fan, and belongs to the technical field of blades. The blade special for the axial-flow fan comprises a blade surface and a blade handle, the blade surface is formed by sequentially combining multiple circular-arc curved surfaces, each circular-arc curved surface has a corresponding chord length, the chord lengths of the circular-arc curved surfaces are progressively decreased in sequence, and the circular-arc curved surface with the longest chord length is connected with the blade handle. The blade special for the axial-flow fan has the advantages of being high in efficiency, small in noise and capable of saving energy.

Description

technical field [0001] The invention belongs to the technical field of special blades for fans, and in particular relates to a special blade for axial flow fans. Background technique [0002] The aerodynamic performance of the axial flow fan impeller is the main factor to determine the performance of the fan, and the cross-sectional shape of the impeller blade is the key to determine the performance of the fan. There are many shapes in the relevant literature, the most important of which is the aircraft wing airfoil used in aviation; due to limited conditions, other fields or industries have no or less investment in the research of airfoils, and the existing aviation airfoils are often used. As the shape of the fan impeller blade, it cannot give full play to the best effect of the airfoil. Usually, advanced aerodynamic design and analysis technology in aviation technology is used to design a series of fan-specific airfoils according to the operating conditions of the fan. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/38F04D29/66
CPCF04D29/384F04D29/388F04D29/663F04D29/666
Inventor 席德科席培涵黄玲萍
Owner SHAANXI JINYI VENTILATION TECH
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