Dilution refrigeration device and method

A dilution refrigeration device comprising:

• a working circuit in the form of a loop contain a cycle fluid, the cycle fluid comprising a mixture of helium-3 and helium-4, the working circuit comprising a mixing chamber, a boiler and a pump, which are disposed in series and fluidically connected via a set of lines, the set of lines of the circuit being configured to connect an outlet of the mixing chamber to an inlet of the boiler and an outlet of the boiler to an inlet of the pump, the set of lines of the circuit also being configured to connect an outlet of the pump to an inlet of the mixing chamber;
• at least one cooling member which is in beat exchange with the working circuit and is configured to transfer cold energy to the cycle fluid, the at least one cooling member comprising a cyrogenerator;
• a support;
• a fluid-tight enclosure having an open end that is mechanically connected to the support via a fluid-tig ex die bellows;
• an upper end of the cryogenerator being fixed to the support;
• and
• a fluid-tight sheath housed in the enclosure, wherein a lower end of the cryogenerator extends in the sheath inside the bellows such that the enclosure and the sheath are at least partially mechanically insulated from vibrations generated by the cryogenerator,
• wherein the circuit comprises a fluid infection line connecting e outlet of the pump to the inlet of the mixing chamber via a fluid-tight passage in the sheath, the injection line being in heat exchange with the cyrogenerator and being mechanically decoupled from the cryogenerator and from the support, such that the injection line is at least partially mechanically insulated from the vibration generated by the cryogenerator,
• wherein the at least one cooling member further comprises an additional cooling system located at the inlet upstream of the boiler, wherein the additional cooling system is a Joule-Thomson expansion valve.