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    Modified face seal for positive film stiffness
    2.
    发明授权
    Modified face seal for positive film stiffness 失效
    改良的正面密封用于正片刚度

    公开(公告)号：US4291887A

    公开(公告)日：1981-09-29

    申请号：US92145

    申请日：1979-11-07

    申请人： Robert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch ,  Izhak Etsion ,  Abraham Lipshitz

    发明人： Robert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch ,  Izhak Etsion ,  Abraham Lipshitz

    IPC分类号： F16J15/34 ,  F16J15/40

    CPC分类号： F16J15/3404

    摘要： The object of the invention is to improve the film stiffness of a face seal without increasing the sealing and dam area.The improved sealing apparatus (16) has a primary seal ring (20) in the form of a nose piece. A spring (24) forces a sealing surface (28) on the seal ring into sealing contact with a seat (18) to form a face seal. A circumferential clearance seal is formed in series with this face seal by a lip (34) on the nose piece. The width of the surface (36) of the lip is substantially the same as the width of the sealing surface (28) on the face seal. Also the clearance between the surface (36) on the lip and the shaft (10) is substantially the same as the spacing between the face sealing surfaces (28 and 30) on the face seal when the shaft is rotating.The circumferential clearance seal restricts the flow of fluid from a main cavity (14) to an intermediate cavity (32) with a resulting pressure drop. The hydrostatic opening face is strongly dependent on the face seal clearance, and the desired axial stiffness is achieved.

    摘要翻译： 本发明的目的是在不增加密封和坝面积的情况下提高面密封的膜刚度。 改进的密封装置（16）具有鼻部形式的主密封环（20）。 弹簧（24）迫使密封环上的密封表面（28）与座（18）密封接触以形成面密封。 圆周间隙密封件通过鼻片上的唇缘（34）与该面部密封件串联形成。 唇缘的表面（36）的宽度与面密封件上的密封表面（28）的宽度基本相同。 此外，当轴旋转时，唇缘上的表面（36）与轴（10）之间的间隙基本上与面密封件上的面密封表面（28和30）之间的间隔相同。 周向间隙密封限制流体从主腔（14）到中间腔（32）的流动，产生压力降。 流体静力开启面很大程度上取决于表面密封间隙，实现了所需的轴向刚度。