Spraying pipe sealing plug cover for rocket engine air tightness detection

The utility model discloses a spray pipe sealing blanking cap used for rocket engine air tightness detection. The spray pipe sealing blanking cap comprises a blanking cap body and an inflation interface arranged on the blanking cap body. A circular plate with the diameter matched with the diameter of a nozzle throat is arranged in the middle of the blanking cap body, the outer edge of the circular plate extends forwards in the axial direction to form a conical limiting face, and the conicity of the conical limiting face is matched with the conicity of the inner wall of the front section of the nozzle. The inflation connector is arranged in the middle of the blanking cap body circular plate. And the spray pipe sealing plug cover is fixedly adhered to the rear end of the inner wall of the spray pipe front section through a conical limiting surface. The blanking cap body and the inflation connector are made of rubber materials and are integrally formed in a compression molding mode. The inflation connector is a