FIELD: cryogenic engineering and cryogenic refrigerating machines operating on the Stirling reverse cycle principle, applicable for thermostatic temperature control of various objects and longterm keeping of food-stuffs and other materials. SUBSTANCE: nitrogen gas is cooled down to cryogenic temperature in a coil immersed in liquid nitrogen and fed to the nitrogen dispensing and collection system located in a heat-insulated cooled volume, where the volume interior is cooled down to the necessary low temperature. Vapors of nitrogen formed in the gas-containing section of the vessel with liquid nitrogen are throttled through a valve to an expansion vessel, from which they are fed to the condenser of the Stirling cryogenic refrigerating machine, where they get condensed changing in the liquid phase, then they overflow by gravity to the Dewer flask. After that they are fed to the vessel by the high-pressure pump. The Stirling cryogenic machine is driven by the engine of the transport facility, electric motor or an individual heat engine. EFFECT: prevented loss of nitrogen, thermostatic temperature control of the system at a high level of explosion-and fireproofness, as well as quick freezing and long-term safekeeping of food stuffs in nitrogen medium. 1 dwg
