US2015132121A1PendingUtilityA1

Fan

47
Assignee: HON HAI PREC IND CO LTDPriority: Nov 14, 2013Filed: Dec 31, 2013Published: May 14, 2015
Est. expiryNov 14, 2033(~7.3 yrs left)· nominal 20-yr term from priority
Inventors:Shu Yuan
F04D 19/002F04D 29/685F04D 29/526F04D 29/403F04D 29/601
47
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Claims

Abstract

A fan includes a frame and an impeller. The frame defines a hole in a middle of the frame. An inner wall of the frame bounding the hole defines a circumferential groove and forms a circumferential protrusion adjoining the groove. The impeller is received in the hole of the frame. When the impeller is rotated, airflow through the hole is pressurized by the groove and the protrusion, and concentrates when the airflow is blown out of the hole.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A fan, comprising:
 a frame defining a hole in a middle of the frame, an inner wall of the frame bounding the hole defining a circumferential groove and forming a circumferential protrusion adjoining the groove; and   an impeller received in the hole of the frame, wherein when the impeller is rotated, airflow through the hole is pressurized by the groove and the protrusion, and concentrates when the airflow is blown out of the hole.   
     
     
         2 . The fan of  claim 1 , wherein the groove and the protrusion cooperate to form a wave-shaped surface on the inner wall of the frame. 
     
     
         3 . The fan of  claim 2 , wherein a cross section of each of the groove and the protrusion is arc-shaped. 
     
     
         4 . The fan of  claim 1 , wherein a cross section of the hole is elliptic. 
     
     
         5 . A fan, comprising:
 a frame defining a hole in a middle of the frame, an inner wall of the frame bounding the hole defining a plurality of circumferential grooves and forming two circumferential protrusions adjoining opposite sides of each groove; and   an impeller received in the hole of the frame, wherein when the impeller is rotated, airflow through the hole is pressurized by the plurality of grooves and protrusions, and concentrates when the airflow is blown out of the hole.   
     
     
         6 . The fan of  claim 5 , wherein the plurality of grooves and protrusions cooperate to form a wave-shaped surface on the inner wall of the frame. 
     
     
         7 . The fan of  claim 6 , wherein a cross section of each groove and each protrusion is arc-shaped. 
     
     
         8 . The fan of  claim 5 , wherein a cross section of the hole is elliptic.

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