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提出了液体非接触机械密封零压差零泄漏的密封观点，理论分析指出密封端面能存在气液分界面，并推导出了确定单端面外装同向双槽机械密封气液分界面半径的解析表达式。
The zero point differential pressure leak of the liquid non-contact mechanical seal is presented. The theoretical analysis indicates that the gas-liquid interface can exist on the sealed end surface and the analytical expression to determine the gas-liquid interface radius of the single-end exterior double- formula.