Liquid nitrogen sampling device for specific surface area analyzer

The utility model discloses a liquid nitrogen sampling device for a specific surface area analyzer, which comprises at least one liquid nitrogen cup, a static pressure liquid level sensor is arranged in the liquid nitrogen cup, a thimble valve is arranged at the bottom of the liquid nitrogen cup, and the thimble valve is connected with a liquid inlet part; the liquid inlet part comprises a liquid inlet branch pipe connected with the ejector pin valve, a liquid inlet pump and a stop valve are arranged on the liquid inlet branch pipe, the liquid inlet branch pipe is connected with a liquid nitrogen vacuum bottle and a liquid nitrogen recovery tank through pipelines, and valves are arranged on the pipelines where the liquid nitrogen vacuum bottle and the liquid nitrogen recovery tank are communicated with the liquid inlet branch pipe. According to the utility model, the lower end of the liquid nitrogen cup is connected with the liquid inlet device, so that the liquid can be automatically fed in the use process,