58 results about "Cryogenic engineering" patented technology

The invention provides a method for making a microvacuum multilayer heat-insulating quilt, belonging to cryogenic engineering and cryogenic technical field. The method comprises the following steps of: preparing a mechanized production line; a plurality of reflecting layers and heat insulating layers is sewed into a quilt by seams after the plurality of reflecting layers and heat insulating layers are alternately combined on the production line according to certain requirements; and the quilt is evenly penetrated to make holes. The microvacuum multilayer heat-insulating quilt made by using the method reduces workloads for winding heat-insulating materials, shortens binding period, guarantees that the heat insulation quilt can not loose during using, and even can improve vacuumizing efficiency and maintain high vacuum degree between interlayer on the premise of a guarantee of excellent and stable heat insulation performance, thereby the method has more advantages of lot manufacturing and producing of cryogenic storage and transportation equipment, and prominent economic benefit and social benefit in cryogenic engineering.

The invention provides high-strength 9% Ni steel for ultra-low temperature engineering fasteners and a preparation method thereof, and relates to the technical field of low-temperature metal materials. The present invention adopts the vacuum induction + electroslag remelting smelting process, so that the high-strength 9% Ni steel for ultra-low temperature engineering fasteners of the present invention has higher purity and lower gas content; forging and supporting high-stable The heat treatment process of the microstructure, that is, quenching and tempering, makes the high-strength 9% Ni steel for ultra-low temperature engineering fasteners possess extremely excellent room / low temperature mechanical properties. The data of the embodiment shows that: the yield strength of the high-strength 9% Ni steel for ultra-low temperature engineering fasteners at room temperature is greater than 800 MPa, the elongation after fracture is greater than 20%, the reduction of area is greater than 65%, and the impact absorption energy of -196°C AKv is greater than 85J.

The gas low-temperature heat exchanger with self-relieving stress and anti-pollution belongs to the field of low-temperature engineering and low-temperature technology. The invention includes a cylinder body of a low-temperature heat exchanger, a lower head of a low-temperature heat exchanger, an upper head of a low-temperature heat exchanger, A, B, C and D four shell-and-tube heat exchangers, tube sheets, support plates, low-temperature heat exchanger tube-side inlet tubes, low-temperature heat exchanger tube-side outlet tubes, low-temperature heat exchanger shell-side inlet tubes and low-temperature heat exchangers Shell-side outlet pipe. The shells of the four shell-and-tube heat exchangers are narrow and rectangular, and the heat exchange tubes are U-shaped heat exchange tubes. The four shell-and-tube heat exchangers are placed in the low-temperature heat exchanger cylinder in a square array and connected in series. . The material used in the low-temperature heat exchanger is OCr18Ni9 / 304, which has low air permeability, smooth inner surface, wear resistance, strong corrosion resistance, and stable performance, preventing gas from being polluted. In addition, at low temperature, the stress generated by the thermal expansion and contraction of the material is considered, so that the stress can be eliminated by itself, and its sealing performance is improved. Finally, the low-temperature heat exchanger has good sealing performance and prevents the gas from being polluted. It has significant economic and social benefits.