Expansion screw for components affected by heat - has sleeve made in one or two parts with threads engaging on threads of screw (NL 3.6.80)

摘要

The expansion screw is used for connecting constructional components affected by heat, and has a heat sleeve which encompasses its expansion shaft with reduced clearance. The sleeve outer diameter is at least equal to the thread outer diameter. The sleeve is built as a two-part casing, or can be of one-piece structure (12) which has an inner thread corresponding to the thread of the expansion screw. A further alternative casing formation is for it to be in two parts, with outer peripheral grooves, each of which takes a ring. The screw finds application in housings of high and medium pressure steam turbines.