Method for assembling a heat exchanger with coaxial tubing for an air-conditioning circuit of a vehicle

A method for assembling a heat exchanger with coaxial tubing, in particular for an air-conditioning circuit of a vehicle, the exchanger comprising:

• a coaxial tubing comprising two coaxial tubes, an internal tube and an external tube respectively, the external tube defining, around the internal tube, a first annular channel (C1) for circulation of a first fluid, and the internal tube internally defining a second channel (C2) for circulation of a second fluid, the tubes being independent and one of the tubes comprising projections bearing on the other of the tubes in order to keep them at a distance from one another,
• a first fluid connector formed by a first block located at a first longitudinal end of the tubing, the first block comprising a first housing for receiving a first longitudinal end of the external tube and a first port in fluid communication with said first housing, the first block comprising a second housing, coaxial with the first housing, for receiving a first longitudinal end of the internal tube and a second port in fluid communication with said second port, and
• a second fluid connector formed by a second block located at a second longitudinal end of the tubing, opposite the first longitudinal end, the second block comprising a first housing for receiving a second longitudinal end of the external tube, and a first port in fluid communication with said first housing, the second block comprising a second housing, coaxial with the first housing, for receiving a second longitudinal end of the internal tube and a second port in fluid communication with said second port,
• wherein the internal tube is formed in a single piece and the external tube is formed by two consecutive sections, the method comprises the following successive steps:
• a) the first longitudinal end of the external tube is engaged in the first housing of the first block and this first longitudinal end is fixed to the first block, this first longitudinal end being located on a first of the sections of the external tube, and the second longitudinal end of the external tube is engaged in the first housing of the second block and this second longitudinal end is fixed to the second block, this second longitudinal end being located on a second of the sections of the external tube,
• b) the internal tube is engaged in the first section, from a free longitudinal end of this first section, opposite the first block, then the internal tube is made to slide in the first section until the first longitudinal end of the internal tube engages in the second housing of the first block,
• c) the internal tube is engaged in the second section, from a free longitudinal end of this second section, opposite the second block, then the internal tube is made to slide in the second section until the second longitudinal end of the internal tube engages in the second housing of the second block, and
• d) the first and second sections of the external tube are secured to each other by means of their respective free longitudinal ends.