Refrigerant phase transformation-free refrigerator for recovering liquefied natural gas (LNG) cold energy

The invention relates to a refrigerant phase transformation-free refrigerator for recovering liquefied natural gas (LNG) cold energy, which belongs to the technical fields of energy saving and refrigeration. The refrigerant phase transformation-free refrigerator for recovering LNG cold energy comprises an LNG storage tank, an LNG cryopump, an LNG carburetor, an LNG-refrigerant heat exchanger, a refrigerator heat exchanger, a refrigerator fan, a refrigerant low-temperature storage tank, a low-temperature refrigerant pump and various flow valves. R410A is selected as refrigerant to sequentially enter all refrigerators after obtaining refrigeration amount from LNG, the refrigerant releases the refrigeration amount step by step, and the step utilization of the cold energy is realized. The refrigerant is run in a complete liquid state in the whole process and does not generate phase transformation in heat exchangers of all the refrigerators; and the refrigeration amount transformation needed by the refrigerators i