Centrifugal pump and method of producing centrifugal pump

Abstract

A centrifugal pump includes a metallic main body casing in which a rotating blade member is accommodated. The metallic main body casing includes an upper main body casing, a lower main body casing which is fixed to the upper main body casing, 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. An edge of the blade casing is airtightly fixed to the upper main body casing or the lower main body casing.

What is claimed: 
     
         1 . A centrifugal pump comprising:
 a metallic main body casing in which a rotating blade member is accommodated,   the metallic main body casing including;
 an upper main body casing, 
 a lower main body casing which is fixed to the upper main body casing, 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,   wherein an edge of the blade casing is airtightly fixed to the upper main body casing or the lower main body casing.   
     
     
         2 . The centrifugal pump of  claim 1 , wherein the edge of the blade casing is airtightly fixed by welding, brazing or adhesion. 
     
     
         3 . The centrifugal pump of  claim 2 , wherein on a vicinity of a fixing portion of at least one of the upper main body casing, the blade casing, and the lower main body casing, a groove for flow stop which prevents the fixing material from flowing is formed. 
     
     
         4 . The centrifugal pump of  claim 3 , wherein the groove for flow stop is formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing. 
     
     
         5 . The centrifugal pump of  claim 3 , wherein the groove for flow stop is formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing to a groove shape. 
     
     
         6 . The centrifugal pump of  claim 3 , wherein the groove for flow stop is formed by providing a groove forming member for the groove forming to at least one of the upper main body casing, the blade casing, and the lower main body casing. 
     
     
         7 . A method of producing of a centrifugal pump, wherein the centrifugal pump comprises:
 a metallic main body casing in which a rotating blade member is accommodated,   the main body casing comprising;
 an upper main body casing, 
 a lower main body casing which is fixed to the upper main body casing, 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,   the method comprising:
 airtightly fixing an edge of the blade casing to the upper main body casing or the lower main body casing. 
   
     
     
         8 . The method of producing of the centrifugal pump of  claim 7 , wherein the edge of the blade casing is airtightly fixed by welding, brazing or adhesion. 
     
     
         9 . The method of producing of the centrifugal pump of  claim 8 , wherein on a vicinity of a fixing portion of at least one of the upper main body casing, the blade casing, and the lower main body casing, forming a groove for flow stop which prevents the fixing material from flowing. 
     
     
         10 . The method of producing of the centrifugal pump of claim  9 , wherein the groove for flow stop is a groove for flow stop, which is formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing. 
     
     
         11 . The method of producing of the centrifugal pump of  claim 9 , wherein the groove for flow stop is formed by notching at least one of the upper main body casing, the blade casing, and the lower main body casing to a groove shape. 
     
     
         12 . The method of producing of the centrifugal pump of  claim 9 , wherein the groove for flow stop is formed by providing a groove forming member for the groove forming to at least one of the upper main body casing, the blade casing, and the lower main body casing.