US2015152879A1PendingUtilityA1

Blade structure of axial fan

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Assignee: APPLIED THERMAL FLUID ANALYSIS CT LTD LIABILITY COMPANYPriority: Nov 29, 2013Filed: Nov 29, 2013Published: Jun 4, 2015
Est. expiryNov 29, 2033(~7.3 yrs left)· nominal 20-yr term from priority
Inventors:Yih-Wei Tzeng
F04D 29/384F04D 19/002
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PatentIndex Score
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Claims

Abstract

A blade structure of an axial fan is disclosed. The blade structure includes a hub and a plural of fan blades. The fan blades are disposed equidistantly on a periphery of the hub along a rotating direction of the hub. Each fan blade includes a first blade and a second blade. The first blade has a first leading edge and a first trailing edge, and the second blade having a second leading edge and a second trailing edge. A line connecting the first leading edge and the first trailing edge of each fan blade is a first chord line. The second leading edge is located at a line extended along the first chord line, and the separation between the first blade and the second blade is smaller than a distance of adjacent fan blades on the periphery of the hub.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A blade structure of an axial fan, comprising:
 a hub; and   a plural of fan blades disposed equidistantly on a periphery of the hub along a rotating direction of the hub, and each fan blade including a first blade and a second blade arranged at intervals, the first blade having a first leading edge and a first trailing edge, the second blade having a second leading edge and a second trailing edge;   wherein, a line connecting the first leading edge and the first trailing edge of each fan blade is a first chord line, the second leading edge is located at a line extended along the first chord line, and a separation between the first blade and the second blade is smaller than a distance of adjacent fan blades on the periphery of the hub.   
     
     
         2 . The structure according to  claim 1 , wherein the separation between the first blade and the second blade is smaller than the one third of the length of the first chord line. 
     
     
         3 . The structure according to  claim 1 , wherein the second trailing edge is located at a line extended along the first chord line. 
     
     
         4 . The structure according to  claim 1 , wherein a surface area of the first blade and a surface area of the second blade are equal. 
     
     
         5 . The structure according to  claim 1 , wherein a surface area of the first blade and a surface area of the second blade are unequal. 
     
     
         6 . The structure according to  claim 1 , wherein a shape of the first blade and a shape of the second blade are the same. 
     
     
         7 . The structure according to  claim 1 , wherein a shape of the first blade and a shape of the second blade are not the same. 
     
     
         8 . The structure according to  claim 1 , wherein a cross sectional area of the first blade and a cross sectional area the second blade at the corresponding position are the same. 
     
     
         9 . The structure according to  claim 1 , wherein a cross sectional area of the first blade and a cross sectional area the second blade at the corresponding position are not the same.

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