Centrifugal ventilator air exhaust opening fast installation converter

The utility model discloses a centrifugal ventilator air exhaust opening fast installation converter comprising a base body of which the inner part is provided with a via hole, and the outer side of one end of the via hole is provided with a plurality of protrusions; the inner wall of a part, positioned on the other end of the via hole, of the base body is provided with a plurality of ejector ball positioning structures that are uniformly distributed on the circumference of the base body; the ejector ball positioning structures are characterized in that round holes that are provided with ejector balls are arranged on the inner wall of the base body, the outer sides of the ejector balls are provided with springs, fixing screw nuts are arranged behind the springs, the diameter of each ejector is 1.2 to 1.5 times as much as the diameter of each round hole, and the inner radial part of the via holes is provided with an inner screw thread which is matched with an outer screw thread of an air exhaust opening. The centrifugal ventilator air exhaust opening fast installation converter is advantageous in that the ejector ball positioning structures are adopted, on-site installation can be realized in a time-saving and labor-saving manner, good sealing effects are realized, installation time is reduced in engine test run processes, and therefore engine test run cost is saved.