A study on dynamic characteristics of spiral groove dynamic pressure ring seal

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (12) : 85-94.

CHEN Huilong，LU Shengsheng，WU Yuanzheng，LI Xinwen，HAN Ting，GUI Kai

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Abstract

The dynamic characteristics of the pump impeller ring seal are closely related to the internal flow characteristics of the orifice ring and even the pump's running stability, the improvement of flow characteristics can be achieved by the shape of the sealing surface of the mouth ring, to this end, a "sealing dam + spiral groove" micro-shaped mouth ring sealing structure for small gaps is proposed in order to obtain better port ring sealing dynamic characteristics. The research shows that the laminar flow model and the turbulence model have good similarity in the basic laws of the ring seal dynamic characteristics and sealing performance, there is only a certain difference in the trend and magnitude of the parameter changes, the analysis suggests that the turbulence model can more fully reflect the effects of micro-gap and microstructure on flow characteristics; the dynamic pressure effect and the pumping effect generated by the spiral groove are enhanced with the increase of the rotational speed and the decrease of the radial clearance; compared with the smooth ring, the spiral notch ring can significantly increase the maximum pressure of the liquid film, and the increase of the eccentricity of the moving ring is more significant; it can be seen that the spiral groove shape can achieve better centering of the ring rotor, reduce wear and prolong the service life.

Key words

spiral groove

/ ring seal / eccentricity / neutral / dynamic characteristics

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CHEN Huilong，LU Shengsheng，WU Yuanzheng，LI Xinwen，HAN Ting，GUI Kai. A study on dynamic characteristics of spiral groove dynamic pressure ring seal[J]. Journal of Vibration and Shock, 2020, 39(12): 85-94

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