中文摘要：

对利用＂磁筛＂作用从空气中富集氧气的永磁体结构进行优化研究.在由两块方形永磁体叠放构成的磁场空间中,中心磁感应强度以及磁场空间对氧气分子的拦截能力随着磁体厚度的增加逐渐提高,但提高速率逐渐减缓,通过增加永磁体厚度增强磁场强度存在一定的饱和度.方形永磁体厚、长尺寸一定时,增加磁体宽度方向的尺寸使磁场空间内的磁感应强度逐渐降低,且在宽度方向上磁场均匀度降低,只有当永磁体厚宽比大于1时,磁场空间内磁场才能满足＂磁筛＂结构磁场空间内磁场均匀度的要求.永磁体厚度、宽度一定时,磁体长度变化对磁场空间磁感应强度影响较小,可以通过适当增加磁体长度,延长＂磁筛＂结构对空气的作用时间,增强＂磁筛＂结构的富氧效果.

英文摘要：

A permanent magnet frame based on ＇magnetic sieve＇ effect for oxygen enrichment from air was theoretically studied.In the magnetic field space formed by two square permanent magnets,the central magnetic flux density and the capability of intercepting oxygen molecules increase with the thickness of magnets increasing,but the increase speed slows down.The enhancement of magnetic flux density by increasing the thickness of magnets is not infinite.For the specified thickness and length of magnets,the magnetic flux density and magnetic uniformity across width in the magnetic field space decrease with the width of magnets increasing.The magnetic uniformity required by the characteristic of the ＇magnetic sieve＇ can be satisfied only when the thickness-to-width ratio of permanent magnets is larger than 1.For the given thickness and width of magnets,the magnetic flux density in the magnetic field space is less influenced by the change in length of magnets.Therefore,appropriately increasing the length of magnets can prolong the flow time of air and improve oxygen enrichment by the ＇magnetic sieve＇.