Conjoined foldable volute and fan

The utility model discloses a one-piece foldable volute and a fan, the one-piece foldable volute comprises a first half volute, a second half volute and a third half volute, the first half volute is provided with a first connecting part; the first half volute is provided with a first connecting part, the second half volute is provided with a second connecting part, the joint of the second half volute and the first half volute is a folding part, and the folding part can enable the second half volute to rotate relative to the first half volute so as to enable the first half volute and the second half volute to be oppositely folded and covered or oppositely unfolded; the first connecting part and the second connecting part are connected so that the first half volute and the second half volute can be relatively fixed. The one-piece foldable volute can be manufactured through one set of mold, and the situation that the first half volute and the second half volute are manufactured through two sets of molds respecti