Spraying tube device and heat exchanger using the same

A spraying tube device comprising:

• a spraying tube configured to eject a spray solution upward through a plurality of ejection holes arranged at a top most portion of the spraying tube along a tube axis;
• a cover arranged above the spraying tube so as not to contact an outer surface of the spraying tube and configured to receive the ejected spray solution and cause the spray solution to flow through a space between nail portions of the cover and the spraying tube to flow downward on an outer surface of the spraying tube;
• and
• a uniformizing structure configured to uniformize in a tube axis direction a distribution of the spray solution having flowed downward from the nail portions of the cover, wherein:
• the cover has an inverted U-shaped cross section perpendicular to a longitudinal direction along the tube axis and includes cutout portions and the nail portions, the cutout portions being each formed by cutting out the cover upward from a lower end edge of each of both side walls of the cover and being arranged at a predetermined pitch along the longitudinal direction, the nail portions being each formed between an adjacent cutout portions;
• and
• a width of each of the cutout portions along the longitudinal direction at the lower end edge of each of the side walls is larger than a width of each of the nail portions.