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提出一种新型径向环形汽封,对其结构及密封原理进行分析。与传统梳齿汽封相比,在结构上增加4个90°转弯,将流体泄漏方向由轴向改为径向。增大密封内流体流动阻力,减小了气流激振力。建立普通梳齿汽封和径向环形汽封三维数值计算模型。计算结果表明,同一密封间隙下径向环形汽封泄漏系数比普通轴向梳齿汽封低20%左右。转速对2种汽封径向气流力影响较小,而对切向气流力影响较大。随转速升高,切向气流力不断增大,系统稳定性降低。同一偏心情况下,径向环形汽封径向气流力约比轴向梳齿汽封大1～3倍,切向气流力约比轴向梳齿汽封小70%～75%,且这一比例随转速升高越来越大。
A new type of radial annular seal is proposed, and its structure and sealing principle are analyzed. Compared with the traditional comb seal, the structure of the increase of 4 90 ° turn, the direction of fluid leakage from the axial to radial. Increasing fluid flow resistance within the seal, reducing the airflow excitation force. The three-dimensional numerical calculation model of common comb seal and radial seal is established. The calculation results show that the leakage coefficient of the radial annular seal under the same seal gap is about 20% lower than that of the common axial comb seal. The rotational speed has little effect on the radial airflow force of the two types of gland seals, but has a great influence on the tangential airflow force. With the increase of rotational speed, the tangential air-flow force continuously increases and the system stability decreases. Under the same eccentricity, the radial annular seal radial airflow force is about 1 to 3 times larger than that of the axial comb seal, and the tangential air flow force is about 70% -75% smaller than that of the axial comb seal The proportion increases with increasing speed.