Fan blade and neck fan

A neck fan, comprising:

• a main body, a driving mechanism, and a fan blade;
• wherein the fan blade comprises a base, a plurality of outer blades, and a plurality of inner blades;
• wherein the base is circular and protrudes in the middle, including an annular outer disc, a connecting cylinder, and a circular inner disc, the outer disc is annularly arranged on an outside of a bottom end of the connecting cylinder, and the inner disc seals a top end of the connecting cylinder, and the inner disc is used for connecting an output shaft of the driving mechanism;
• and
• the plurality of outer blades are annularly arranged on the outside of the outer disc, and the plurality of inner blades are annularly arranged on the outside of the inner disc, so that both the plurality of outer blades and the plurality of inner blades are located on the same side of the base, and the plurality of outer blades and the plurality of inner blades are spaced apart;
• wherein the main body is U-shaped, both ends of the U-shaped main body are provided with air inlet chambers, the fan blade is placed in the air inlet chamber, a side of the main body facing outward is provided with an air inlet corresponding to the air inlet chamber, and the driving mechanism is installed in the connecting cylinder and is used for driving the fan blade to rotate;
• and
• the ratio of the height of the plurality of outer blades to the height of the plurality of inner blades is 4-6;
• and the ratio of the width of the plurality of outer blades to the width of the plurality of inner blades is 1.5-2.