Thermomagnetic sliding bush stop sealing device for nuclear reactor coolant pump

一种核主泵用的热磁滑套停车密封装置

Abstract

A thermomagnetic sliding bush stop sealing device for a nuclear reactor coolant pump comprises a sliding bush base and a sliding bush. The sliding bush base and a shaft are in interference fit, the sliding bush and the shaft are in clearance fit, the sliding bush is sleeved in the sliding bush base, a first seal ring, a second seal ring and a third seal ring are arranged on the sliding bush which is made of metal materials, and the sliding bush base is made of magnetic materials. The sliding bush is internally provided with two symmetric spring cavities, springs are arranged in the spring cavities, and the sliding bush base is provided with a hole. The sliding bush base and the sliding bush are attracted to compress the springs while the hole is sealed by the sliding bush. When a primary seal of the nuclear reactor coolant pump fails, high-temperature process fluid makes the sliding bush base lose magnetism, magnetic force between the sliding bush and the sliding bush base disappears, the sliding bush moves to the primary seal until being tightly pressed on the wall of a pump cavity under the action of spring force and pressure of the high-temperature fluid in the pump cavity, and the high-temperature process fluid in the pump cavity is prevented from leaking outwards. The thermomagnetic sliding bush stop sealing device is passive and free of external gas supply.
一种核主泵用的热磁滑套停车密封装置,包括滑套基座和滑套,滑套基座与轴过盈连接,滑套与轴间隙连接,滑套套在滑套基座内部,滑套上设有第一密封圈、第二密封圈和第三密封圈,滑套采用金属材料,滑套基座采用磁性材料制造,滑套内设有两处对称的弹簧腔,弹簧腔内设有弹簧,滑套基座上设有小孔,滑套基座与滑套相吸,对弹簧压缩,同时滑套封住小孔,当核主泵主密封失效时,高温工艺流体使得滑套基座失去磁性,滑套与滑套基座之间的磁力消失,滑套在弹簧力以及泵腔内高温流体压力的作用下,向主密封侧移动直到把滑套压紧在泵腔壁上,阻止泵腔内的高温工艺流体向外泄漏,本发明无需外部气源,具有非能动性。

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