Abstract: A volute mechanism for a blower, the mechanism including: a volute (1), the volute (1) including a cavity (11) and a first through hole (12); and a manometric interface (2), the manometric interface (2) including a second through hole (21) inside. The cavity (11) is arranged inside the volute (1) for accommodating a wheel. The manometric interface (2) is disposed in the first through hole (12) and is movable along an axial direction of the first through hole (12). The second through hole (21) and the cavity (11) are in communication.

Abstract: A connecting structure, including: a volute including an air inlet and an air outlet; and a conversion interface. A connecting part is disposed on an outer side of the air outlet. The connecting part includes: a lower plate; a lower lug protruding outward from each end of the lower plate; and an upper flange disposed above the lower plate. The conversion interface includes a sleeve. An upper plate protrudes from a rear part of the sleeve. Two upper lugs protrude outward from two ends of the upper plate, respectively. A lower flange is disposed on the rear part of the sleeve beneath the upper plate. The upper plate is disposed on the upper flange. The lower flange is disposed on a curved convex block that protrudes upward from an outer edge of the lower plate. The upper lug is disposed on the lower lug.