Pump impeller for submerged pump and submerged pump including same

Abstract

A pump impeller for a submerged pump capable of removing or reducing the radial load is provided. A non-clogging submerged pump is provided, which includes a substantially cylindrical body, an intake port provided in a center of a lower end surface of the body, a discharge port that is open in a side surface of the body, and a flow channel passing from the intake port to the discharge port within the body. The flow channel includes a plurality of flow channels, and the flow channels have their size, shape, and position defined such that fluid unbalance is reduced with respect to an axis of rotation.

1 . A pump impeller for a non-clogging submerged pump comprising:
 a substantially cylindrical body;   an intake port provided in a center of a lower end surface of the body;   a discharge port that is open in a side surface of the body; and   a flow channel passing from the intake port to the discharge port within the body,   wherein the flow channel includes a plurality of flow channels, and   the flow channels have their size, shape, and position defined such that fluid unbalance is reduced with respect to an axis of rotation.   
     
     
         2 . The pump impeller according to  claim 1 , wherein the flow channel includes two or more flow channels. 
     
     
         3 . The pump impeller according to  claim 1 , wherein a cross-sectional area of the flow channel varies between the intake port and the discharge port. 
     
     
         4 . The pump impeller according to  claim 1 , wherein a cross-sectional shape of the flow channel varies between the intake port and the discharge port. 
     
     
         5 . The pump impeller according to  claim 4 , wherein the cross-sectional shape of the flow channel changes from circular to generally rectangular or elliptic from the intake port toward the discharge port. 
     
     
         6 . The pump impeller according to  claim 1 , wherein an inner wall surface of the flow channel is formed of a continuous curved surface. 
     
     
         7 . The pump impeller according to  claim 1 , wherein inner walls close to a junction of at least two of the flow channels have a surface roughness different from each other. 
     
     
         8 . The pump impeller according to  claim 1 , wherein all of the flow channels have the same size and shape, and are disposed at an equal angular interval with respect to the axis of rotation. 
     
     
         9 . A submerged pump comprising:
 the pump impeller according to  claim 1 ;   a pump casing that contains the pump impeller; and   a motor that drives the pump impeller.