US2006034697A1PendingUtilityA1

Propeller structure of a fan

26
Assignee: CHEN CHENG-KANGPriority: Aug 12, 2004Filed: Aug 12, 2004Published: Feb 16, 2006
Est. expiryAug 12, 2024(expired)· nominal 20-yr term from priority
Inventors:Cheng-Kang Chen
F04D 29/681F04D 29/384F04D 29/667
26
PatentIndex Score
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Claims

Abstract

A propeller structure of a fan, including a base section and multiple vanes. The base section has a base section surface and each vane has a vane surface for contacting with airflow. The propeller has multiple recesses distributed over the base section surface of the base section and the vane surfaces of the vanes. The recesses are formed on the base section surface and the vane surfaces for reducing the flow resistance between the airflow and the base section surface and the vane surfaces of propeller and the noise produced when the propeller rotates.

Claims

exact text as granted — not AI-modified
1 . A propeller structure of a fan, comprising a base section and multiple vanes, the base section having a base section surface and each vane having a vane surface for contacting with airflow, said propeller structure being characterized in that the propeller has multiple recesses distributed over the vane surfaces of the vanes, the recesses being formed on the vane surfaces for reducing the flow resistance between the airflow and the vane surfaces of the propeller and the noise produced when the propeller rotates.  
   
   
       2 . The propeller structure as claimed in  claim 1 , wherein the recesses formed on the vane surfaces are concave faces.  
   
   
       3 . A propeller structure of a fan, comprising a base section and multiple vanes, the base section having a base section surface and each vane having a vane surface for contacting with airflow, said propeller structure being characterized in that the propeller has multiple recesses distributed over the base section surface of the base section and the vane surfaces of the vanes, the recesses being formed on the base section surface and the vane surfaces for reducing the flow resistance between the airflow and the base section surface and the vane surfaces of propeller and the noise produced when the propeller rotates.  
   
   
       4 . The propeller structure as claimed in  claim 3 , wherein the recesses formed on the base section surface and the vane surfaces are concave faces.

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