6 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 vacuum multi-layer heat insulation liquid hydrogen container and a using method, the vacuum multi-layer heat insulation liquid hydrogen container comprises a liquid hydrogen storage tank outer tank and a liquid hydrogen storage tank inner tank located in the liquid hydrogen storage tank outer tank, and a nitrogen heat insulation structure, a methane gas heat insulation structure, a carbon dioxide heat insulation structure and a radiation heat insulation structure are sequentially arranged between the liquid hydrogen storage tank outer tank and the liquid hydrogen storage tank inner tank from inside to outside. According to the liquid hydrogen storage tank, efficient heat insulation of the liquid hydrogen storage tank and gradient utilization of the evaporation gas cooling capacity are comprehensively achieved through the liquid hydrogen evaporation gas cooling capacity and the multiple heat insulation layers internally filled with gas with different freezing point temperatures, meanwhile, the different heat insulation layers are isolated from one another, and the problem that the vacuum degree of a traditional liquid hydrogen storage tank is prone to damage is solved. The functions of the nitrogen heat insulation layer, the methane gas heat insulation layer, the carbon dioxide heat insulation layer and the radiation heat insulation layer can be regulated and controlled through corresponding valves, so that the liquid hydrogen storage tank has heat insulation regulation capacity, application scenes with different evaporation rate requirements can be effectively met, and emergency discharge of a hydrogen medium in the liquid hydrogen storage tank is achieved in some specific scenes.

The present invention proposes a low-temperature composite insulation layer, a preparation method thereof, and an application in a vehicle-mounted low-temperature hydrogen storage tank. The composite insulation layer includes a hollow microsphere layer and a multi-layer insulation layer; the hollow microsphere layer includes a support body and a hollow microsphere powder; the hollow microsphere powder is filled inside the support body to form a hollow microsphere layer; the multi-layer insulation layer includes at least one of a uniform density multi-layer insulation material layer, a variable density multi-layer insulation material layer, a uniform density integrated insulation film, and a variable density integrated insulation film. The composite insulation layer is a composite of a hollow microsphere layer and a multi-layer insulation layer, giving full play to the advantages of the two insulation layers. In a high vacuum, the point-contact hollow microspheres can extend the solid heat conduction path and minimize solid heat transfer. The multi-layer insulation layer can effectively block radiation heat transfer. The two are combined to form a composite insulation layer, which has better insulation performance.

The present invention discloses an on-vehicle liquid hydrogen cold energy recovery and reuse system, comprising a liquid hydrogen container, a cold storage device, a first heat exchange pipe, a second heat exchange pipe, etc.; the first heat exchange pipe portion is arranged on the side of the high vacuum multi-layer insulation layer close to the inner container, one end of which is connected to the inner container, and the other end is connected to the cold storage device, for circulating the liquid hydrogen output from the inner container; the second heat exchange pipe contains refrigerant, the second heat exchange pipe portion is arranged on the side of the high vacuum multi-layer insulation layer close to the outer container, and the second heat exchange pipe is connected to the cold storage device to form a circulation loop. The present application utilizes the phase change cold storage characteristics of the cold storage material to store the liquid hydrogen cold energy, and then reuses the stored cold energy through the refrigerant circulation loop, reducing the cold energy loss of liquid hydrogen and the evaporation amount of liquid hydrogen, thereby improving the thermal insulation performance of the liquid hydrogen container, and achieving the purpose of effectively reducing the heat leakage of the liquid hydrogen container for heavy trucks and the operating power consumption of various on-board systems.

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.