Active surface for a packing seal intended for a shaft sealing system
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United States of America Patent
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Jun 23, 2020
Grant Date -
Jun 16, 2016
app pub date -
Jul 22, 2014
filing date -
Jul 24, 2013
priority date (Note) -
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Abstract
A packing seal is provided for a system for sealing the shaft of a primary motor-driven pump unit of a nuclear reactor, intended to ensure sealing between the primary circuit and the atmosphere. The packing seal including a rotary active surface and a floating active surface, in which a face of the floating active surface and/or the rotary active surface is micro- or nano-structured by an array of holes or pillars, each hole or pillar having lateral dimensions and a height of between 10 nm and 5 μm, the distance between two consecutive holes or pillars being between 10 nm and 5 μm.
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