an air conditioner body provided with an air inlet and an air outlet;

a condenser provided in the air conditioner body; and

an anti-blow-by structure arranged between the air inlet and the condenser,

wherein the anti-blow-by structure comprises a box body,

wherein the box body comprises an upper top plate, a lower bottom plate, a vertical insertion plate, a vertical connection face and a curved connection face,

wherein the upper top plate, the lower bottom plate, the vertical insertion plate and the vertical connection face define a first opening face in communication with and facing the air inlet,

wherein the upper top plate, the lower bottom plate, the vertical insertion plate and the curved connection face define a second opening face in communication with and facing the condenser,

wherein the first opening face and the second opening face are arranged perpendicular to each other,

wherein the curved connection face extends away from the vertical connection face in an air inlet direction, and

wherein a distance between the curved connection face and the second opening face is inwardly narrowed along the air inlet direction such that an inward narrowing of the distance in a first portion of the curved connection face adjacent to the vertical connection face is greater than an inward narrowing of the distance in a second portion of the curved connection face adjacent to the second opening face.