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Fan blades

a technology of blades and axial fans, applied in the direction of liquid fuel engine components, pump components, non-positive displacement fluid engines, etc., can solve the problems of increasing increasing dust, and settling a great deal of dust, so as to reduce power consumption and noise, reduce pressure differences, and eliminate backflow phenomena

Inactive Publication Date: 2010-06-17
ZHONGSHAN BROAD OCEAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In view of the above-described problem, it is one objective of the invention to provide a conventional blade for an axial fan that is capable of eliminating a backflow phenomena caused by separation of boundary layer airflow, reducing power consumption and noise, and preventing dust from being settled on a back edge portion on a windward side of the blade.
[0008]It is another objective of the invention to provide a conventional blade for a centrifugal fan that is capable of eliminating a backflow phenomena caused by separation of boundary layer airflow, reducing power consumption and noise, and preventing dust from being settled on a back edge portion on a windward side of the blade.
[0021]Advantages of the blade for an axial fan of the invention comprise: 1) the pressure balance holes disposed on the back edge portion are capable of balancing pressure and reducing pressure difference between a front side and a back side of the blade; 2) the pressure balance holes are capable of eliminating a backflow phenomena caused by separation of boundary layer airflow at the back edge portion on a windward side of the blade and thus reducing power consumption and noise; 3) the pressure balance holes are capable of preventing dust from being settled on a back edge portion on a windward side of the blade.
[0022]Advantages of the blade for a centrifugal fan of the invention comprise: 1) the pressure balance holes disposed on the back edge portion are capable of balancing pressure and reducing pressure difference between a front side and a back side of the blade; 2) the pressure balance holes are capable of eliminating a backflow phenomena caused by separation of boundary layer airflow at the back edge portion on a windward side of the blade and thus reducing power consumption and noise; 3) the pressure balance holes are capable of preventing dust from being settled on a back edge portion on a windward side of the blade.

Problems solved by technology

However, there are several problems with the blade: as the blade rotates, the airflow at the back edge portion is affected with increase of rotary kinetic energy, as a result, separation of boundary layer airflow causes a backflow phenomena when the airflow is discharged from the back edge portion, which increases power consumption and noise, and a great deal of dust is settled on the back edge portion on a windward side of the blade.
As for a conventional blade for a centrifugal fan, the same problems as above exist.

Method used

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Embodiment Construction

[0029]As shown in FIGS. 2 and 3, a blade for an axial fan of the invention comprises a front edge portion 1, a back edge portion 2, and multiple pressure balance holes 3. The front edge portion 1 operates to blow air from the outside of the blade, the back edge portion 2 operates to blow air to the outside of the blade, and the pressure balance hole 3 is disposed on the back edge portion 2.

[0030]The pressure balance holes 3 are distributed in an array, uniformly or randomly.

[0031]In this embodiment, the pressure balance holes 3 are circular holes, non-circular holes, straight through holes or inclined through holes, and a diameter of each of the pressure balance holes 3 ranges from 0.1 mm to 100 mm.

[0032]The pressure balance holes 3 form a hole net whereby adjusting pressure on both side of the blade.

[0033]The pressure balance holes 3 are capable of balancing pressure and reducing pressure difference between a front side and a back side of the blade, eliminating a backflow phenomena...

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PUM

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Abstract

A blade for an axial fan, including at least a front edge portion, a back edge portion, and multiple pressure balance holes. The front edge portion operates to blow air from the outside of the blade, the back edge portion operates to blow air to the outside of the blade, and the pressure balance hole is disposed on the back edge portion. The pressure balance holes are adapted to balance pressure and reduce pressure difference between the front side and the back side of the blade, eliminating backflow phenomenon caused by separation of boundary layer airflow at the back edge portion on a windward side of the blade and thus reducing power consumption and noise, and preventing dust from settling on the back edge portion on the windward side of the blade.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]Pursuant to 35 U.S.C. §119 and the Paris Convention Treaty, this application claims the benefit of Chinese Patent Application No. 200810187034.0 filed on Dec. 11, 2008, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a blade for an axial fan and a blade for a centrifugal fan.[0004]2. Description of the Related Art[0005]As shown in FIG. 1, a conventional blade for an axial fan comprises a front edge portion and a back edge portion. The front edge portion operates to blow air from the outside of the blade, and the back edge portion operates to blow air to the outside of the blade. However, there are several problems with the blade: as the blade rotates, the airflow at the back edge portion is affected with increase of rotary kinetic energy, as a result, separation of boundary layer airflow causes a backflow phenomena when the airflow is disch...

Claims

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Application Information

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IPC IPC(8): F04D29/30F04D29/32
CPCF04D29/281F04D29/681F04D29/30F04D29/289F04D29/682F04D29/684
Inventor ZHANG, DACHEN, YUQI
Owner ZHONGSHAN BROAD OCEAN
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