Patent ID: 7882632

Claim:
A manufacturing method of an industrial pump for rotatably supporting both end sides of a rotating shaft to which an impeller is attached by a bearing installed in a pump main body, and cooling a shaft seal apparatus arranged adjacent to said bearing by a cooling water introduced from an external portion, wherein the method comprises the steps of: forming a cooling chamber or a cooling water flow path in any one of an inner peripheral surface of a bracket to which said shaft seal apparatus is provided, and an outer peripheral surface of said shaft seal case; forming a concavo-convex surface having an annular concave groove and an annular protrusion having a sharp edge shape in a fitting surface of at least one of said bracket and said shaft seal case; fitting said shaft seal case to the inner periphery of said bracket by heating said bracket; and thereafter integrating said bracket and said shaft seal case by cooling said bracket so that the annular protrusion bites into the fitting surface opposed thereto to plastically deform the fitting surface opposed thereto and fasten and integrate said bracket and said shaft seal case; wherein side edges of said annular protrusion extend perpendicularly to said fitting surface.