Low-Turbulence Impeller for a Fluid Pump

Abstract

A low-turbulence impeller for a fluid pump comprises a first base wall, a second base wall, multiple guiding blades, multiple back-up plates, and multiple runners. The second base wall has an inlet formed through the second base wall. Each one of the runners is formed between two adjacent guiding blades. Each runner has an outlet formed between two adjacent back-up plates. Each runner has a laminar zone communicating with a corresponding outlet and a turbulent zone aligning with the corresponding back-up plate. The fluid can only be flowed out of the outlet from the laminar zone, such that the fluid through the outlet of each runner is in low-turbulence condition. The phenomenon of inverse flow caused by negative pressures and the cavitation corrosion is greatly reduced. The rotational velocity of the low-turbulence impeller is enhanced to promote the fluid-draining efficiency.

What is claimed is: 
     
         1 . A low-turbulence impeller for a fluid pump, the low-turbulence impeller comprising:
 a first base wall having
 a first inner surface; and 
 a first periphery; 
   a second base wall spaced apart from the first base wall and having
 a second inner surface facing the first inner surface; 
 a second periphery; and 
 an inlet formed through the second base wall; 
   multiple guiding blades connected to the first inner surface and the second inner surface, the guiding blades being curved and spaced apart from each other; each one of the guiding blades having
 an inner end; 
 an outer end disposed opposite to the inner end; 
 a first blade surface; and 
 a second blade surface disposed opposite to the first blade surface; 
   multiple back-up plates mounted on the first periphery of the first base wall and the second periphery of the second base wall, and annularly spaced apart from each other; each one of the back-up plates connected to the outer end of a corresponding guiding blade; and   multiple runners, each one of the runners formed between two adjacent guiding blades and two adjacent back-up plates connected to said two adjacent guiding blades, and each one of the runners having
 an outlet formed between said two adjacent back-up plates; 
 a laminar zone being near the first blade surface of one of the two adjacent guiding blades and communicating with the outlet of the runner; and 
 a turbulent zone being near the second blade surface of the other guiding blade and aligning with the corresponding back-up plate. 
   
     
     
         2 . The low-turbulence impeller as claimed in  claim 1 , wherein
 each one of the runners has
 a transition zone located between the laminar zone and the turbulent zone and aligning with one of the back-up plates. 
   
     
     
         3 . The low-turbulence impeller as claimed in  claim 1 , wherein
 each one of the back-up plates has
 a connecting end connected to the outer end of the corresponding guiding blade; and 
 a terminal end disposed opposite to the connecting end of the back-up plate. 
   
     
     
         4 . The low-turbulence impeller as claimed in  claim 2 , wherein
 each one of the back-up plates has
 a connecting end connected to the outer end of the corresponding guiding blade; and 
 a terminal end disposed opposite to the connecting end of the back-up plate. 
   
     
     
         5 . The low-turbulence impeller as claimed in  claim 1 , wherein
 each back-up plate has
 a blocking surface formed between the connecting end and the terminal end, and connected to the second blade surface of the corresponding guiding blade; 
   wherein an included angle between the blocking surface and the second blade surface is an obtuse angle.   
     
     
         6 . The low-turbulence impeller as claimed in  claim 4 , wherein
 each back-up plate has
 a blocking surface formed between the connecting end and the terminal end, and connected to the second blade surface of the corresponding guiding blade; 
   wherein an included angle between the blocking surface and the second blade surface is an obtuse angle.   
     
     
         7 . The low-turbulence impeller as claimed in  claim 1 , wherein
 the back-up plates are respectively mounted between the first periphery of the first base wall and the second periphery of the second base wall;   each one of the back-up plates is integratedly connected to the outer end of the corresponding guiding blade.   
     
     
         8 . The low-turbulence impeller as claimed in  claim 6 , wherein
 the back-up plates are respectively mounted between the first periphery of the first base wall and the second periphery of the second base wall;   each one of the back-up plates is integratedly connected to the outer end of the corresponding guiding blade.   
     
     
         9 . The low-turbulence impeller as claimed in  claim 1  further comprising:
 a ring member securely mounted around the first periphery of the first base wall and the second periphery of the second base wall, and having
 two rings spaced apart from each other, wherein the back-up plates are formed between the rings. 
 
 
     
     
         10 . The low-turbulence impeller as claimed in  claim 6  further comprising:
 a ring member securely mounted around the first periphery of the first base wall and the second periphery of the second base wall, and having
 two rings spaced apart from each other, wherein the back-up plates are formed between the rings. 
 
 
     
     
         11 . The low-turbulence impeller as claimed in  claim 1 , wherein each one of the guiding blades has
 an inner end in a cambered shape.   
     
     
         12 . The low-turbulence impeller as claimed in  claim 8 , wherein each one of the guiding blades has
 an inner end in a cambered shape.