Method for manufacturing a double-wall heat-exchanger tube
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorDenis Sornin
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Abstract
A method for manufacturing a double-wall heat-exchanger tube including an external tube and an internal tube, these tubes being metallic, cylindrical and coaxial. This method includes providing a first tube having an inside diameter d1int and an outside diameter d1ext, this first tube being intended to form the external tube, a second tube having an inside diameter d2int and an outside diameter d2ext, this second tube being intended to form the internal tube, and a cylindrical coaxial tubular leaf made from Fe0 having an inside diameter dint and an outside diameter dext, such that 0.15 mm≤(d1int−dext)≤0.25 mm, 0.15 mm≤(dint−d2ext)≤0.25 mm, and 10 μm≤(dext−dint)≤200 μm.
Claims20
A method for manufacturing a double-wall heat-exchanger tube comprising an external tube and an internal tube, the external and internal tubes being metallic, cylindrical and coaxial, said manufacturing method comprises the following successive steps (i) to (vii):
- (i) providing:
- a first tube having an inside diameter d1int and an outside diameter d1ext, said first tube being intended to form the external tube,
- a second tube having an inside diameter d2int and an outside diameter d2ext, said second tube being intended to form the internal tube, and
- a cylindrical tubular leaf made from Fe0 having an inside diameter dint and an outside diameter dext,
- such that
- 0.15
- mm
- ≤
- (
- d
- 1
-
- int
- -
- d
- ext
- )
- ≤
- 0.25
- mm
- ,
- 0.15
- mm
- ≤
- (
- d
- int
- -
- d
- 2
-
- ext
- )
- ≤
- 0.25
- mm
- ,
- and
- 10
-
- μm
- ≤
- (
- d
- ext
- -
- d
- int
- )
- ≤
- 200
-
- μm
- ;
- (ii) forming a coaxial assembly of the second tube and of the leaf inside the first tube, the leaf being positioned between the first and second tubes;
- (iii) brazing or bonding of one end of the coaxial obtained at the end of step (ii);
- (iv) generating a co-deformation of the coaxial co-deformed assembly obtained at the end of step (iii) to obtain a co-deformed assembly:
- (v) cutting ends of the co-deformed assembly obtained at the end of step (iv);
- (vi) welding the cut ends of the co-deformed assembly obtained at the end of step (v);
- and
- (vii) performing a heat treatment of the assembly obtained at the end of step (vi), said heat treatment being implemented by hot isostatic pressing, with which the double-wall heat-exchanger tube is obtained.
Dependencies are inferred from the claim text.