3 results about "Multi-layer insulation" patented technology

This invention discloses an online detection method and device for the interlayer vacuum degree of multi-layer insulation in cryogenic containers, belonging to the field of cryogenic insulation vacuum detection technology. The method includes: installing a vacuum-sealed base on the outer wall of the container; penetrating the outer liner with a piercing capillary probe and inserting it into the interlayer gap; constructing a two-stage high-vacuum differential system consisting of an oil-free dry forepump, a turbomolecular pump, a fine-tuning needle valve, a flow-limiting capillary, a differential chamber, and a residual gas analyzer to form a low-speed drainage loop; after pre-evacuating the background gas, adjusting the fine-tuning needle valve to extract the interlayer gas at low speed, simultaneously collecting the total pressure and component partial pressures; calculating the true vacuum degree by combining flow resistance, gas resistance, permeation resistance, and temperature correction; after detection, leaving the end of the piercing capillary probe inside the layer without removing it, and permanently sealing the base port; repeating the detection at different points and depths to complete a full-area scan. This application has the advantages of direct online detection, minimally invasive and leak-free operation, repeatable testing, and accurate tracing of failure causes.

The invention discloses a high-vacuum multi-cavity multi-stage fractionation and purification integrated system with liquid nitrogen cold shield cold insulation, which comprises a heat insulation container barrel, a liquid nitrogen cold shield barrel, an outer jacket barrel, a container flange, a lower end cover plate, a first fixing device and a second fixing device, the heat insulation container barrel is arranged in the liquid nitrogen cold shield barrel, a first fixing device is arranged between the heat insulation container barrel and the liquid nitrogen cold shield barrel, the liquid nitrogen cold shield barrel is arranged in the outer jacket barrel, a second fixing device is arranged between the liquid nitrogen cold shield barrel and the outer jacket barrel, and the lower end cover plate is arranged on the heat insulation container barrel. The lower end cover plate is provided with a pipeline inlet and a pipeline outlet which penetrate through the container flange, and one first hollow pipe is connected with one second hollow pipe through a pipeline. In the invention, through triple cold insulation measures of shell high-vacuum multi-layer heat insulation layer cold insulation, liquid nitrogen cold shield and top cold nitrogen cold insulation and heat insulation container vacuumizing cold insulation, heat transfer between the heat insulation container and the outside is almost avoided, and an ideal space completely isolated from the outside is formed.

The application discloses a kind of liquid hydrogen cold energy cascade utilization's adiabatic system, including liquid hydrogen storage tank, first cold storage tank and first cold storage tank, liquid hydrogen storage tank includes inner container, outer container and vacuum multilayer insulation, vacuum multilayer insulation includes first insulation layer, first cold screen, second insulation layer in turn set in outer container;First heat exchanger is immersed in the first cold storage tank in the first cold working medium, and first heat exchanger is communicated with inner container;Second heat exchanger is immersed in the first cold storage tank in the first cold working medium, and the two ends of first heat exchanger are communicated with second heat exchanger, and the two ends of first cold screen are communicated with first cold storage tank, and the cold energy of low-temperature liquid hydrogen is indirectly released to the first cold working medium in the first cold storage tank in the application, so that the first cold working medium in first cold screen is always maintained at lower temperature, and then the temperature in first cold screen is maintained at lower temperature, to reduce container radiation heat loss.