Patent ID: 6883548

Claim:
A spacer for a long substrate in the interior of a long tube, wherein a superinsulation material is arranged between the substrate and the tube, said spacer comprising two first rings ( 3 , 4 ) seated on the substrate ( 1 ) and spaced apart at a longitudinal axial distance from one another, a tube section ( 5 ) supported on the rings ( 3 , 4 ), the length of the tube section ( 5 ) corresponds to 1 to 2 times the outside diameter of the tube ( 2 ), and a second ring ( 6 ) located on the tube section ( 5 ) between the two first rings, wherein the first rings ( 3 , 4 ), the tube section ( 5 ) and the second ring ( 6 ) are made of a material that has poor thermal conductivity but high mechanical strength.