Double casing type high-efficiency fluid temp.-reducing and pressure-decreasing device

The utility model relates to a double casing type high-efficiency fluid temperature-reducing and pressure-decreasing device, which is an improved design for an original double casing type cooler to have double functions of reducing the temperature and decreasing the pressure. The utility model comprises an outer casing tube wound into a spiral shape and an inner tube penetrating through the inner part of the outer casing tube. The utility model is characterized in that the inner diameter of the inner tube is no more than 4 millimeters. The utility model is suitable for the temperature-reducing and pressure-decreasing process for various high-temperature and high-pressure fluid during sampling and analyzing.