Low pulsation pump

Abstract

The object of the present invention is to provide a centrifugal pump or compressor which reduces pulsations and variations in pressure, commonly called “pump noise”. This invention discloses a centrifugal pump design wherein the relationship of the impeller to the volute shape and the exit port tend to decrease the net amplitude of the pulsations within the flow of pressurized fluid produced by cancellation of pulse peaks.

What is claimed is:  
     
         1 . An improved centrifugal pump which reduces or eliminates pulsations and variations in pressure, comprising: 
 a centrifugal pump having a body portion having an internal volute surface; said pump also having an impeller with a plurality of blades; said pump also having an elongated exit port having an enlarged discharge angle; and wherein the relationship of said impeller to said volute shape and said exit port tend to decrease the net amplitude of the pulsations within the flow of pressurized fluid produced at said exit port.    
     
     
         2 . An improved centrifugal pump according to  claim 1  wherein the pressure pulsations produced tend to overlay each other and tend to cancel each other out.  
     
     
         3 . An improved centrifugal pump according to  claim 3  wherein two or more of said blades are passing by said exit port at one time.  
     
     
         4 . An improved centrifugal pump according to  claim 2  wherein said compressor has at least five blades.  
     
     
         5 . An improved centrifugal pump according to  claim 4  wherein said exit port has an angle of at least 100 degrees.  
     
     
         6 . An improved centrifugal pump according to  claim 4  wherein said impeller has at least five blades and not more then eight blades.  
     
     
         7 . An improved centrifugal pump according to  claim 5  wherein said impeller has eight blades, and wherein said exit port has an angle of at least 100 degrees.  
     
     
         8 . An improved centrifugal pump according to  claim 6  wherein said impeller has eight blades, and wherein said exit port has an angle of about 100 degrees.  
     
     
         9 . An improved centrifugal pump according to  claim 4  wherein said pump includes an impeller shaft having a shaft end and extends within a bearing and seal assembly.  
     
     
         10 . An improved centrifugal pump according to  claim 9  wherein said impeller fastened to said shaft end.  
     
     
         11 . An improved centrifugal pump according to  claim 10  wherein said shaft, said bearing and seal assembly and said impeller are mounted within a pump housing.  
     
     
         12 . An improved centrifugal pump according to  claim 11  wherein said housing includes an inlet port, said internal volute surface, an exit port and an outlet conduit.