Electrically motorized pump for use in water

Abstract

The electrically motorized pump has a low energy loss because it uses of the shaft and the sleeve made from synthetic resin composition obtained by uniformly dispersing fine powder of RBC or CRBC in a resin. The typical process for the production of a synthetic resin composition for making the sleeve bearing for the pump for use in water includes kneading with a resin the fine powder of RBC or CRBC at a temperature in the neighborhood of the melting point of the resin, and thereby uniformly dispersing the fine powder of RBC or CRBC in the resin.

We claim:  
     
         1 . An electrically motorized pump for use in a fluid comprising: 
 a motor;    a pump; and    at least one sleeve bearing wherein a portion of the sleeve bearing is made of a synthetic resin composition obtained by uniformly dispersing powder of RBC or CRBC in a resin, the rotating parts of the motor and the pump being rotatably supported by the sleeve bearing.    
     
     
         2 . The electrically motorized pump of  claim 1 , wherein the motor comprises: 
 a stator;    a housing with collar; and    a can seal with collar, the stator being located in an outer peripheral space between the housing and the can seal.    
     
     
         3 . The electrically motorized pump of  claim 2 , wherein the motor further comprises: 
 a rotor;    a shaft; and    at least one sleeve, the shaft and the sleeve forming the sleeve bearing and the rotor being rotatably supported by the sleeve bearing forming a rotor assembly, the rotor assembly being located in an inner space of the can seal.    
     
     
         4 . The electrically motorized pump of  claim 1 , wherein a fluid may freely flow from the impeller side to the rotor side.  
     
     
         5 . The electrically motorized pump of  claim 3 , wherein the synthetic resin composition has a ratio by mass of fine powder of RBC or CRBC to the resin of 30 to 90:70 to 10.  
     
     
         6 . The electrically motorized pump of  claim 5 , wherein the resin used in making the sleeve bearing is selected from a group consisting of nylon 66, nylon 6, nylon 11, nylon 12, poly acetal, poly butylenes terephthalate, poly ethylene terephthalate, poly propylene, poly ethylene, and poly phenylene sulfide.  
     
     
         7 . The electrically motorized pump of  claim 5 , wherein the resin, used in making the sleeve bearing includes at least two members of the group consisting of nylon 66, nylon 6, nylon 11, nylon 12, poly acetal, poly butylenes terephthalate, poly ethylene terephthalate, poly propylene, poly ethylene, and poly phenylene sulfide.  
     
     
         8 . The electrically motorized pump of  claim 5 , wherein the average particle diameter of the powder of RBC or CRBC is 300 μm or less.  
     
     
         9 . The electrically motorized pump of  claim 8 , wherein the average particle diameter of the powder of RBC or CRBC is 10 to 50 μm.  
     
     
         10 . The electrically motorized pump of  claim 8 , wherein the shaft is made of rust-resistant steel series metal.  
     
     
         11 . The electrically motorized pump of  claim 3 , wherein the shaft is made of the synthetic resin composition.  
     
     
         12 . The electrically motorized pump of  claim 11 , wherein the resin used in making the shaft is selected from a group consisting of nylon 66, nylon 6, nylon 11, nylon 12, poly acetal, poly butylenes terephthalate, poly ethylene terephthalate, poly propylene, poly ethylene, and poly phenylene sulfide.  
     
     
         13 . The electrically motorized pump of  claim 11 , wherein the resin used in making the shaft includes at least two members of the group consisting of nylon 66, nylon 6, nylon 11, nylon 12, poly acetal, poly butylenes terephthalate, poly ethylene terephthalate, poly propylene, poly ethylene, and poly phenylene sulfide.  
     
     
         14 . The electrically motorized pump of  claim 13 , wherein the average particle diameter of the fine powder of RBC or CRBC is 10 to 50 μm.  
     
     
         15 . The electrically motorized pump of  claim 3 , wherein the sleeve of the sleeve bearing has at least one spiral groove on the inner face of the sleeve.  
     
     
         16 . The electrically motorized pump of  claim 3 , wherein the shaft has at least one spiral groove on its surface.