针对转子偏心引起的密封流体激振问题,设计了一种新型偏心自适应调节密封结构.该结构可自适应地减小转子偏心量,抑制密封流体激振.对其抑振机理进行探究,得出当偏心自调结构的固有频率和转子密封系统的激励频率一致时,其抑振效果最好;随着两者差值增大,其抑振效果变弱.以水作为密封介质,测量了不同弹簧刚度下偏心自调结构的固有频率,并改变转子转频,对其抑振规律进行实验研究.结果表明该结构固有频率随弹簧刚度增大而增大,但与激励频率差别较大,振动降幅只在10％～ 20％.将偏心自调结构浸于水,测量其固有频率,对其抑振规律进行实验研究.结果表明浸在水中时该结构固有频率值依然随弹簧刚度增大而增大,但比在空气中时减小了约40％,更加接近激励频率,抑制效果显著,振动降幅最大可达41.27％.%Aiming at reducing the seal fluid excitation caused by rotor eccentricity,a new eccentricity self-adjusting seal structure which can decrease the rotor eccentricity was designed and its vibration suppression mechanism was explored.It is concluded by the theoretical analysis that the vibration suppression effect will be the best only when the natural frequency of the designed structure is consistent with the rotor-seal exciting frequency.Using water as the sealing media,the natural frequencies of the designed structure with different spring stiffness were measured respectively.Changing the rotating frequency,the structural vibration suppression effect was experimentally investigated.The results show that the structural frequency increases with the increase of spring stiffness,but is much higher than the rotor-seal exciting frequency.The vibration amplitude reduction ratio is not notable,only between 10％ ～ 20％.Then the eccentricity structure was put into the water,its frequency in water was measured,and its vibration suppression effect in water was experimentally researched.The results demonstrate that the structural frequencies in water still increase with the increase of spring stiffness but are about 40％ lower than in the air.So,the structural frequency in water is closer to the exciting frequency and the vibration suppression effect in this condition is more obvious.The maximum vibration amplitude reduction ratio reaches 41.27％.
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