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2. 发明授权

US4545587A Coaxial, multiple-shaft ferrofluid seal apparatus 失效
标题翻译：同轴多轴铁磁流体密封装置
公开(公告)号：US4545587A
公开(公告)日：1985-10-08
申请号：US673545
申请日：1984-11-20
申请人： Donald W. Higgins
发明人： Donald W. Higgins
IPC分类号： F16J15/43 , F16J15/40 , F16J15/16
CPC分类号： F16J15/43
摘要： A multiple-shaft coaxial ferrofluid seal apparatus which comprises: a nonmagnetic housing; a central shaft element; and one or more successively coaxial shaft elements about the central shaft element with one or more of the coaxial shaft elements composed of a nonmagnetically permeable shaft section between a first and second magnetically permeable shaft sections. The seal apparatus includes an axial polarized annular permanent magnet together with first and second pole piece elements, the pole piece elements generally aligned with the magnetically permeable shaft sections to provide for a single magnetic structure within the housing and for a closed-loop magnetic flux to retain ferrofluid as a ferrofluid seal between the coaxial shaft elements which provides for hermetic sealing of the rotary motion of two or more of the coaxial shaft elements employing a single magnetic structure. The multiple-shaft coaxial ferrofluid seal apparatus also includes rotary bearings for the coaxial and central shaft element.
摘要翻译：一种多轴同轴铁磁流体密封装置，包括：非磁性壳体; 中心轴元件; 以及围绕中心轴元件的一个或多个连续的同轴轴元件，其中一个或多个同轴轴元件由在第一和第二导磁轴段之间的非磁性可渗透的轴部分组成。该密封装置包括一个轴向极化的环形永磁体以及第一和第二极片元件，极片元件大体上与导磁轴部分对准，以在壳体内提供一个单一的磁性结构，以及一个闭环磁通量将铁磁流体保留在同轴轴元件之间的铁磁流体密封，其提供使用单个磁性结构的两个或更多个同轴轴元件的旋转运动的气密密封。多轴同轴铁磁流体密封装置还包括用于同轴和中心轴元件的旋转轴承。

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