The Exact Moments of a Ratio of Quadratic Forms in Normal Variables
The Exact Moments of a Ratio of Quadratic Forms in Normal Variables
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DOI：
10.2307/20075629
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发表时间：
1986
影响因子：
1.9
通讯作者：
J. Magnus
中科院分区：
文献类型：
--
作者：
J. Magnus
本发明涉及用于穿过容器壁的旋转轴的密封装置，例如机器的外壳，例如在水或浆料上运行的泵。在两个环的轻度接触密封面之间提供第一端面密封，其中一个环固定在轴上，另一个环固定在壁上。这些密封面可以是坚硬的材料，例如钢，并作为固体材料的屏障。然后提供第二端面密封，其作为液体通过第一端面密封的屏障，并由相对硬和软密封面合作组成。
The invention relates to sealing means for a rotary shaft which passes through a container wall, such as the casing of a machine, e.g., a pump which operates on water or slurries. A first face seal is provided between lightly contacting sealing surfaces of two rings one of which is secured to the shaft and the other to the wall. These sealing surfaces may be of hard material, e.g. steel, and serve as a barrier to solid material. A second face seal is then provided which acts as a barrier to liquid passing the first face seal and is comprised of co-operating relatively hard and soft sealing surfaces.