Study on Test Scheme for Friction Properties and Service Life of Secondary Seal of Reactor Coolant Pump Hydrodynamic Shaft Seal
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摘要: 副密封处的摩擦性能与寿命是影响核主泵流体动压轴封寿命的关键因素，为了研究副密封处的长期运行寿命，建立了高频往复试验装置，以模拟副密封处在高压介质条件下的往复运动，获取了副密封处O型橡胶密封圈与对偶金属件在频率提高、位移幅值增加和介质压力提高3种工况下的摩擦力变化数据，结果表明：核主泵流体动压轴封副密封在正常运行工况频率为25 Hz、幅值约为30 μm及介质压力为5.3 MPa时处于微动弹变状态；基于正常运行工况提高频率，在不超过300 Hz时副密封处的摩擦特性基本不会改变，但超过500 Hz时摩擦特性会明显变化；基于正常运行工况增加幅值和提高介质压力，副密封处的摩擦特性也基本维持不变。可见，在300 Hz以下提高频率对副密封寿命的影响可按线性增加考虑，能有效降低寿命验证时间。Abstract: The friction properties and service life of the secondary seal are the key factors affecting the service life of the hydrodynamic shaft seal of the reactor coolant pump. In order to study the long-term service life of the secondary seal, a high-frequency reciprocating test device is established to simulate the reciprocating motion of the secondary seal under the high pressure medium condition, and the friction change data of the O-shaped rubber sealing ring and dual metal parts of the secondary seal under three working conditions of increasing frequency, increasing displacement amplitude and increasing medium pressure are obtained. The results show that the secondary seal of hydrodynamic shaft seal of the reactor coolant pump is in a fretting friction state under the normal operating condition frequency of 25 Hz, amplitude of about 30 μm and medium pressure of 5.3 MPa. The friction properties of the secondary seal will remain basically unchanged when the frequency is increased to a level no higher than 300 Hz under the normal operating conditions, but the friction properties will change significantly when the frequency is increased to a level higher than 500 Hz. The friction properties of the secondary seal will remain basically unchanged when the amplitude or the fluid pressure is increased under the normal operating conditions. It can be seen that the effect of increasing the frequency to a level below 300 Hz on the service life of secondary seal can be considered as linear increase, which can effectively reduce the service life verification time.
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Key words:
- Reactor coolant pump /
- Hydrodynamic shaft seal /
- Secondary seal /
- Service life
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表 1 副密封往复运动试验方案
Table 1. Reciprocating Motion Test Scheme of Secondary Seal
名称 频率/Hz 幅值/μm 压力/MPa 频率影响试验 25/100/300/500 30 5.3 幅值影响试验 25 30/50/100/200 5.3 压力影响试验 25 30 2.5/5.3/7.0/12.5/15.5 
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表 2 摩擦力随频率变化
Table 2. Variation of Friction with Frequency
幅值/μm 压力/MPa 频率/Hz F/Fn 30 5.3 25 1.00 30 5.3 50 1.07 30 5.3 100 1.05 30 5.3 200 1.04 30 5.3 300 1.06 30 5.3 500 2.10
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表 3 摩擦力随幅值变化
Table 3. Variation of Friction with Amplitude
压力/MPa 频率/Hz 幅值/μm F/Fn 5.3 25 30 1.00 5.3 25 50 0.88 5.3 25 100 0.85 5.3 25 200 0.99
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表 4 摩擦力随压力变化
Table 4. Variation of Friction with Pressure
幅值/μm 频率/Hz 压力/MPa F/Fn 30 25 2.5 1.05 30 25 5.3 1.00 30 25 7.0 0.97 30 25 12.5 0.93 30 25 15.5 0.87
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