Abstract: The utility model discloses a liquid oxygen system which comprises a fractionating tower, a liquid oxygen storage tank and a liquid oxygen input pipeline, wherein the fractionating tower is provided with a main condensation evaporator, the bottom of the liquid oxygen storage tank is provided with a first hole; the liquid oxygen input pipeline is respectively connected with the outlet of the main condensation evaporator and the first hole; and the liquid oxygen input pipeline is provided with a first regulating valve. According to the liquid oxygen system disclosed by the utility mode, liquid oxygen enters into the liquid oxygen storage tank from the bottom instead of the top, and the static pressure difference between liquid oxygen at the outlet of the main condensation evaporator and the liquid oxygen in the liquid oxygen storage tank is increased, so that the problem that original main cold liquid oxygen cannot be smoothly discharged to the liquid oxygen storage tank is solved, the occurrence of a phenomenon that the gas in the liquid oxygen input pipeline is blocked is avoided, and the main original cold liquid oxygen is guaranteed to be smoothly discharged into the liquid oxygen storage tank. Compared with the prior art in which a pipeline descends to a height close to the ground and then ascends to the top of the liquid oxygen storage tank, the liquid oxygen system disclosed by the utility model has the advantages that the inflexion points of the adopted liquid oxygen input pipeline are greatly reduced, so that the flow velocity of liquid oxygen in the pipeline is further increased, the conditions for heat exchange between the liquid oxygen in the pipeline and the external environment are greatly reduced, and thus the evaporation rate of the liquid oxygen in the pipeline is reduced.
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