Production process for air-gap-insulated tube unit involves putting one tube in other, fixing at ends, bending and providing sliding seat at one end or both

摘要

#CMT# #/CMT# The production process involves an outer tube (10) and an inner tube (12), which is put into the outer one. A spacer (24) is formed in one of them by creating a bead in it. The two tubes are fixed in the region of the spacer. The unit is then bend in the presence of spacers between them. A sliding seat is provided at one or both tube ends (21, 22) by upsetting the outer tube or widening the inner one. #CMT#USE : #/CMT# For an air-gap-insulated tube unit. #CMT#ADVANTAGE : #/CMT# Simpler and cheaper. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a longitudinal section through the tube unit. 10 : Outer tube 12 : inner tube 21, 22 : Tube ends 24 : Spacer.