High-integration double-layer vacuum heat insulation cold box structure for liquid hydrogen flow metering

The invention relates to a high-integration double-layer vacuum heat insulation cold box structure for liquid hydrogen flow measurement. The device comprises a cold box, a low-temperature liquid hydrogen pump, a refrigerating machine, a matched adjusting valve, a detected flowmeter and a pipeline system. The cold box adopts a double-layer vacuum structure combining an outer cylinder and an inner cylinder, and the bottom of the outer cylinder is connected with the base to form an outer vacuum layer; the inner cylinder is arranged in the outer cylinder and is an inner vacuum layer; the top of the outer cylinder is provided with a low-temperature liquid hydrogen pump, a refrigerator and a flange interface of a matched valve; a mounting interface corresponding to the outer cylinder is preset at the top of the inner cylinder; and the low-temperature liquid hydrogen pump, the detected flowmeter, the pipeline system and the refrigerating machine are integrated in the cold box. According to the double-layer vacuum he