UNIT FOR SECURING TUBE IN TUBE SHEETS Russian patent published in 1994 - IPC

FIELD: heat exchange apparatus. SUBSTANCE: unit for securing tube 1 in tube sheets 3 and 15 provided with holes with thrust projections 10 and 11 respectively is perfectly tight under varying temperature conditions due to gaskets 3 and 4 adjoining above-mentioned projections, washer 8 and spring. End of tube 1 is mounted in hole of tube sheet 3 with gasket 2 adjoining the end; pressure nut 9 is screwed in branch pipe 7 which is rigidly connected with tube sheet 15. Bush 14 and spring 5 pressed with pressure nut 9 and engageable with bush 14 are mounted at end of tube 1. Tightness of unit is not impaired in case of change of linear size of tube 1 in course of operation of apparatus. EFFECT: enhanced tightness of unit. 1 dwg