Connecting structure for mutually clamping fan shell and air pipe

The utility model discloses a connecting structure for mutually clamping a fan shell and an air pipe. Air duct, positioning bulge, an L-shaped positioning groove is formed in the inner circumferentialsurface of the air pipe in the circumferential direction; the L-shaped positioning groove comprises a first open groove; the first open groove and the second open groove are vertically formed in a penetrating mode, the length of the positioning protrusion is smaller than that of the first open groove, the width of the positioning protrusion is smaller than that of the second open groove, and a protruding part used for abutting against the positioning protrusion is arranged on the side wall, close to the first open groove, of the second open groove; the thickness of each positioning protrusionis smaller than or equal to the depth of the corresponding L-shaped positioning groove, and the included angle between every two adjacent positioning protrusions is set to be 120 degrees. By means ofthe structural design, the