NUCLEAR REACTOR COOLANT PUMP AND PASSIVE PARKING SEALING DEVICE THEREOF

• Main Authors: CONG, Guo hui, ZHANG, Yi xun, LUO, Zhi yuan, WANG, Xue ling
• Format: Patent
• Language: Chinese; English; French
• Published: 22.11.2018
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

A passive parking sealing device (30) for a nuclear reactor coolant pump. The passive parking sealing device (30) comprises a complete sealing ring (40) that can be in a starting position and a non-starting position, and a complete limit ring (50) that softens when a state conversion temperature is reached. When the limit ring is in a temperature below at a state conversion temperature, the sealing ring surrounds in the circumferential direction of a pump shaft (18) of a nuclear reactor coolant pump and maintains a clearance with the pump shaft under the support of the limit ring. When the limit ring is in the state conversion temperature or in a temperature higher than the state conversion temperature, the limit ring is softened or melted, and the sealing ring loses the support of the limit ring and tightly holds the pump shaft, so as to prevent the reactor coolant from flowing along the pump shaft. The passive parking sealing device for a nuclear reactor coolant pump is only provided with a sealing ring pro