APPARATUS FOR EXPANDING TUBES Russian patent published in 1998 - IPC

FIELD: expanding tube in tube wall of heat exchangers, mainly tubes with ends extending out of tube wall and, possibly, tubes flush mounted in tube wall. SUBSTANCE: apparatus includes stem axially mounted in rod of power cylinder. Said stem supports rod sleeve with annular protrusion near its working end. Said protrusion has tapered end at side of working end of said rod sleeve. Intermediate ring and spacer assembly are mounted in end portion of said rod sleeve in front of said protrusion; elastic sleeve and bearing sleeve with working portion on its outer lateral side are mounted behind said annular protrusion. Said bearing sleeve has two diametrically opposite radial slits on its end portion at side of power cylinder. Flange of rod sleeve is introduced through said slits to said bearing sleeve. End portion of bearing sleeve is joined with rod sleeve and with controlled-length spacing stops arranged at outer side of said bearing sleeve. At side of said radial slits inner spacing collar is mounted on end portion of bearing sleeve and it secured to adaptor joined with body of power cylinder. Adjusting nut with locking member is screwed on bearing sleeve between said spacing collar and flange of rod sleeve. The above mentioned stem has annular supporting member in the form of nut on its end. EFFECT: improved design. 4 cl, 1 dwg sleeve spacing bushing 777777