Centrifugal pump

Abstract

A centrifugal pump includes a rotating blade member including an impeller member and a rotor magnet provided under the impeller member, a metallic main body casing in which the rotating blade member is accommodated, and a coil portion configured to rotate the rotating blade member. The coil portion is disposed to be located in a periphery of the rotor magnet. The metallic main body casing includes an upper main body casing, and a lower main body casing which is fixed to the upper main body casing. The lower main body casing includes a blade accommodating portion, which extends horizontally from an outer periphery of the lower main body casing to an inner periphery side, and a rotor magnet accommodating portion, which extends downwardly from the blade accommodating portion.

What is claimed: 
     
         1 . A centrifugal pump comprising:
 a rotating blade member including an impeller member and a rotor magnet provided under the impeller member,   a metallic main body casing in which the rotating blade member is accommodated, and   a coil portion configured to rotate the rotating blade member, wherein the coil portion is disposed to be located in a periphery of the rotor magnet,   the metallic main body casing including;
 an upper main body casing, and 
 a lower main body casing which is fixed to the upper main body casing, 
   the lower main body casing including;
 a blade accommodating portion, which extends horizontally from an outer periphery of the lower main body casing to an inner periphery side, and 
 a rotor magnet accommodating portion, which extends downwardly from the blade accommodating portion. 
   
     
     
         2 . The centrifugal pump of  claim 1 , wherein
 the lower main body casing includes a metallic press molding article, and   the lower main body casing includes a nonmagnetic metal.   
     
     
         3 . The centrifugal pump of  claim 2 , wherein the nonmagnetic metal includes an austenitic stainless steel. 
     
     
         4 . The centrifugal pump of  claim 3 , wherein the austenitic stainless steel includes 10.5% or more of the content of nickel. 
     
     
         5 . The centrifugal pump of  claim 3 , wherein the austenitic stainless steel includes 10.5-16% of the content of nickel. 
     
     
         6 . The centrifugal pump of  claim 5 , wherein the austenitic stainless steel comprises one of SUS305, SUS308, SUS309, SUS316, or SUS317. 
     
     
         7 . The centrifugal pump of  claim 1 , further comprising:
 a metallic suction side coupling member, which is provided to connect to the metallic main body casing to introduce fluid into the impeller member,   a metallic discharge side coupling member, which is provided to connect to the metallic main body casing to exhaust at least a part of fluid by rotating the impeller member, and   a blade casing, which partitions an interior space formed by the upper main body casing and the lower main body casing so that   a fluid introducing passage is formed at an upper portion, and   a rotating accommodating space that accommodates the rotating blade member is formed at a lower portion.