Optimized connection assembly between two portions of a supply line for a cryogenic fluid, including an additional thermal insulation chamber and a fluid expansion chamber

A connection assembly between two portions of a supply line for a cryogenic fluid, the connection assembly comprising:

• a first line portion,
• a second line portion,
• the first line portion including a male nozzle arranged to be at least partially inserted into a female nozzle of the second line portion, said male and female nozzles together forming a tight sliding mechanical link,
• the first line portion being made of a first material with a coefficient of expansion lower than the coefficient of expansion of a second material used to make the second line portion,
• the first line portion including a first thermal insulation chamber and the second line portion including a second thermal insulation chamber,
• at least one additional thermal insulation chamber that is separate from each of the first and second thermal insulation chambers and that extends between the first and second thermal insulation chambers, and
• an expansion chamber for said fluid arranged around and exterior to contact surfaces between the first line portion and the second line portion where said male nozzle is at least partially inserted into said female nozzle, the expansion chamber being disposed between the first thermal insulation chamber and the second thermal insulation chamber and being linked via a duct to a sensor which detects the presence of said cryogenic fluid located within the duct or within the expansion chamber.