Pump assembly

The utility model relates to the technical field of fluid delivery pumps, and provides a pump assembly which comprises a pump body, a shielding motor and a frequency converter, the pump body comprises a pump head and a pump head sealing ring, the pump head is connected with the pump head sealing ring, the shielding motor is connected with the pump head, and the shielding motor comprises a bearing seat, a shielding sleeve and a motor pump sealing ring. The shielding sleeve is connected with the bearing seat and forms a seam allowance matching surface with the bearing seat, the motor pump sealing ring is connected with the shielding sleeve and the bearing seat, the motor pump sealing ring is arranged on one side, close to the pump head, of the shielding sleeve, the front end edge surface of the shielding sleeve is a central positioning surface, and the matching surface is centered by machining the corresponding matching surface of the front end edge surface and the pump head; the central lines of the motor rota