Pump impeller

Abstract

A pump impeller has two impeller bodies attached to each other. Each impeller body has an annular base wall and multiple partition protrusions separately formed on an inner surface of the base wall. Multiple outlet channels are respectively defined between the partition protrusions. Each outlet channel has a cross-sectional area decreasing from an inner end to an outer open end of the outlet channel. Thus, liquid flowing through the outlet channels does not become turbulent and a working efficiency of a pump with the pump impeller is certainly improved.

1 . A pump impeller comprising
 a first impeller body having
 a first base wall being annular and having an inflow hole formed through a center of the first base wall; and 
 multiple first partition protrusions separately formed on and arranged around an inner surface of the first base wall, and each first partition protrusion being curved and having a width increasing from an inner end to an outer end of the first partition protrusion; 
   a second impeller body securely attached to the first impeller body and having
 a second base wall separated from and being parallel to the first base wall of the first impeller body and having an axial portion formed on a center of the second base wall; and 
 multiple second partition protrusions separately formed on and arranged around an inner surface of the second base wall , and each second partition protrusion being curved and having a width increasing from an inner end to an outer end of the second partition protrusion; and 
   multiple outlet channels respectively defined between the first partition protrusions and the second partition protrusions, and each outlet channel having
 an outer open end; and 
 a cross-sectional area decreasing from an inner end to the outer open end of the outlet channel. 
   
     
     
         2 . The pump impeller as claimed in  claim 1 , wherein
 the second partition protrusions of the second impeller body respectively correspond to and stack against the first partition protrusions of the first impeller body; and   each outlet channel is defined between two adjacent first partition protrusions and two second partition protrusions that correspond to the two adjacent first partition protrusions.   
     
     
         3 . The pump impeller as claimed in  claim 1 , wherein
 each second partition protrusion is mounted between two adjacent first partition protrusions; and   each outlet channel is defined between one of the first partition protrusions and one of the second partition protrusions next to each other.   
     
     
         4 . The pump impeller as claimed in  claim 2  further comprising a partition panel being annular, mounted between the first partition protrusions of the first impeller body and the second partition protrusions of the second impeller body. 
     
     
         5 . The pump impeller as claimed in  claim 1  further comprising a collar mounted around the first impeller body and the second impeller body and having multiple outflow holes separately formed through the collar and respectively corresponding to the outer open ends of the outlet channel. 
     
     
         6 . The pump impeller as claimed in  claim 2  further comprising a collar mounted around the first impeller body and the second impeller body and having multiple outflow holes separately formed through the collar and respectively corresponding to the outer open ends of the outlet channel. 
     
     
         7 . The pump impeller as claimed in  claim 3  further comprising a collar mounted around the first impeller body and the second impeller body and having multiple outflow holes separately formed through the collar and respectively corresponding to the outer open ends of the outlet channel. 
     
     
         8 . The pump impeller as claimed in  claim 4  further comprising a collar mounted around the first impeller body and the second impeller body and having multiple outflow holes separately formed through the collar and respectively corresponding to the outer open ends of the outlet channel. 
     
     
         9 . The pump impeller as claimed in  claim 5 , wherein each outflow hole of the collar is equal to or smaller than the outer open end of a corresponding outlet channel. 
     
     
         10 . The pump impeller as claimed in  claim 6 , wherein each outflow hole of the collar is equal to or smaller than the outer open end of a corresponding outlet channel. 
     
     
         11 . The pump impeller as claimed in  claim 7 , wherein each outflow hole of the collar is equal to or smaller than the outer open end of a corresponding outlet channel. 
     
     
         12 . The pump impeller as claimed in  claim 8 , wherein each outflow hole of the collar is equal to or smaller than the outer open end of a corresponding outlet channel. 
     
     
         13 . The pump impeller as claimed in  claim 9 , wherein
 each first partition protrusion has two opposite side surfaces;   the first impeller body has multiple chamfers respectively formed between the side surfaces of the first partition protrusions and the inner surface of the first base wall of the first impeller body;   each second partition protrusion has two opposite side surfaces; and   the second impeller body has multiple chamfers respectively formed between the side surfaces of the second partition protrusions and the inner surface of the second base wall of the second impeller body.   
     
     
         14 . The pump impeller as claimed in  claim 10 , wherein
 each first partition protrusion has two opposite side surfaces;   the first impeller body has multiple chamfers respectively formed between the side surfaces of the first partition protrusions and the inner surface of the first base wall of the first impeller body;   each second partition protrusion has two opposite side surfaces; and   the second impeller body has multiple chamfers respectively formed between the side surfaces of the second partition protrusions and the inner surface of the second base wall of the second impeller body.   
     
     
         15 . The pump impeller as claimed in  claim 11 , wherein
 each first partition protrusion has two opposite side surfaces;   the first impeller body has multiple chamfers respectively formed between the side surfaces of the first partition protrusions and the inner surface of the first base wall of the first impeller body;   each second partition protrusion has two opposite side surfaces; and   the second impeller body has multiple chamfers respectively formed between the side surfaces of the second partition protrusions and the inner surface of the second base wall of the second impeller body.   
     
     
         16 . The pump impeller as claimed in  claim 12 , wherein
 each first partition protrusion has two opposite side surfaces;   the first impeller body has multiple chamfers respectively formed between the side surfaces of the first partition protrusions and the inner surface of the first base wall of the first impeller body;   each second partition protrusion has two opposite side surfaces; and   the second impeller body has multiple chamfers respectively formed between the side surfaces of the second partition protrusions and the inner surface of the second base wall of the second impeller body.   
     
     
         17 . The pump impeller as claimed in  claim 13  further comprising multiple bolts securely mounted through the first and second base walls and the first and second partition protrusions of the first and second impeller bodies. 
     
     
         18 . The pump impeller as claimed in  claim 14  further comprising multiple bolts securely mounted through the first and second base walls and the first and second partition protrusions of the first and second impeller bodies. 
     
     
         19 . The pump impeller as claimed in  claim 15  further comprising multiple bolts securely mounted through the first and second base walls and the first and second partition protrusions of the first and second impeller bodies. 
     
     
         20 . The pump impeller as claimed in  claim 16  further comprising multiple bolts securely mounted through the first and second base walls and the first and second partition protrusions of the first and second impeller bodies.