Industrial pump and manufacturing method thereof

摘要

The invention relates to an industrial pump, comprising a bearing (12) provided in the pump main body (1) and rotatably supporting both end sides of a rotating shaft (6) to which an impeller (7) is attached. A shaft seal device (16) is arranged adjacent to the bearings (12). The shaft seal device (16) is cooled by cooling water introduced from an external portion. The shaft seal case (16a) is fitted to the inner peripheral surface of a bracket (13) accommodating the shaft seal device (16) through shrink-fitting. Cooling water is circulated in the boundary portion between the bracket (13) and the shaft seal case (16a). This construction avoids O-ring sealings between the bracket (13) and the shaft seal case (16a) and thus avoids repair work due to O-ring wear and allows an easy manufacture of the pumps at reduced costs.