Patent ID: 7198465
Filing Date: 2007-04-03
Classification: F01D,F16B,Y10S,Y10T

Abstract:
1. A fastening arrangement for a split casing assembled by fastening a plurality of casing segments, comprising: a first and a second casing segment assembled together by joining joint faces of the respective segments, said first and second casing segments are provided with bolt holes in such a manner that the bolt hole of the first casing segment and the bolt hole of the second casing segment align with each other and, when the first and the second casing segments are assembled together, form a continuous bolt hole crossing the joint faces and extending tangentially in walls of both casing segments, the walls of the casing segments separating an interior of a hollow casing from an exterior of the hollow casing, and at least the bolt hole in the first casing segment is provided with an internal screw thread; a sleeve having an external screw thread and being fitted into the bolt hole of the first casing segment by engaging the external screw thread of the sleeve with the internal screw thread of the bolt hole of the first casing segment; and a fastening bolt provided with an enlarged diameter portion provided on a shaft portion of the fastening bolt, and passing through the bolt hole of the first casing segment and the sleeve therein, wherein said enlarged diameter portion abuts an end of the sleeve opposite to the joint face and, when a tensile force is exerted on the fastening bolt at the portion between the enlarged diameter portion and the second casing segment, the tensile force is first transferred from the fastening bolt to the sleeve through the abutment of the enlarged diameter portion and the end face of the sleeve, then transferred from the sleeve to the first casing segment through the engagement of the external screw thread of the sleeve and internal screw thread of the bolt hole and generates a fastening force for pressing the first casing segment against the second casing segment, wherein said enlarged diameter portion is integrally formed on the shaft portion of the fastening bolt such that said enlarged portion of the fastening bolt is housed in said bolt hole when said enlarged diameter portion abuts the end of the sleeve opposite to the joint face, wherein the bolt hole is formed perpendicular to the joint face from the first casing segment, and wherein the fastening bolt has a length such that an upper end of the bolt protrudes from the first casing segment when the fastening bolt is screwed into the bolt hole in the second casing segment.