Oblique flow booster fan

An oblique flow booster fan, comprising:

• an impeller, comprising an impeller body and a plurality of blades connected to the impeller body, each of the blades spirally extended from a top of the impeller body to a bottom of the impeller body, two ends of each of the blades being provided an upper edge and a lower edge respectively, and the upper edge having a width larger than the lower edge;
• an air guide assembly, comprising an outer ring, an inner cylinder spaced apart in the outer ring, and a plurality of air guide vanes evenly connected between the outer ring and the inner cylinder;
• a motor, installed in the inner cylinder and having a rotating shaft connected to the impeller body;
• and
• a pressurization volute casing, arranged outside the impeller and connected to the outer ring, one end of the pressurization volute casing being provided with an air inlet, and another end of the outer ring being provided with an air outlet.