Low temperature liquid transfer line dry pre-cooling system

By using a dry precooling system, a sealed precooling pipeline subsystem and a flexible thermal bridge design are employed to achieve stable precooling of cryogenic liquid transport pipelines. This solves the problems of complex traditional precooling processes and large cryogenic liquid losses, thereby improving the efficiency and safety of launch missions.

CN119062844BActive Publication Date: 2025-10-17ZHEJIANG UNIV
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Patent Information

Application Number
CN202411077372.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-07
Publication Date
2025-10-17
Estimated Expiration
2044-08-07

AI Technical Summary

Technical Problem

The existing cryogenic liquid transportation pipeline has a complex pre-cooling process, unstable two-phase flow, and large cryogenic liquid loss, which cannot meet the rapid transportation and refueling requirements of high-frequency launch missions.

Method used

A dry precooling system is adopted, which uses a sealed precooling pipeline subsystem. The space between the inner and outer metal pipes is filled with heat insulation material. The heat conduction unit of the refrigerator is connected to the inner metal pipe with a flexible thermal bridge. The vacuum cold box monitors and controls the temperature to achieve the transfer of cold energy in the form of solid heat conduction.

Benefits of technology

It reduces the mass consumption of cryogenic fluids, avoids pressure pulsation and thermal stress in the pipeline, ensures temperature uniformity throughout the pipeline, and improves precooling efficiency and safety.

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Abstract

The application discloses a low-temperature liquid conveying pipe dry precooling system, which comprises a plurality of sealed and connected precooling pipeline subsystems; each precooling pipeline subsystem comprises a conveying pipe unit, a refrigerating machine heat conduction unit and a cold box unit; the conveying pipe unit comprises an inner metal pipe and an outer metal pipe, and a plurality of layers of heat insulation materials are arranged in the interlayer space of the inner and outer metal pipes; the refrigerating machine heat conduction unit comprises a refrigerating machine and a flexible heat bridge; the cold box unit comprises a vacuum cold box and a temperature control module; the vacuum cold box is arranged at the middle position of the inner metal pipe, and the interlayer space of the inner and outer metal pipes shares a vacuum environment with the vacuum cold box; the cold head of the refrigerating machine is arranged inside the vacuum cold box and is connected to the surface of the inner metal pipe through the flexible heat bridge to conduct heat; and the temperature control module is used for monitoring the change of sensor parameters in the vacuum cold box and completing power regulation of the refrigerating machine. The application can solve the problems of complex precooling process, unstable two-phase flow and large liquid consumption of the low-temperature liquid conveying pipe.
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