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| 凝聚式过滤器的滤芯为什么使用多孔泡沫层(或罩)? |
| 发布时间：2020-06-06 浏览量：2084 |
一般凝聚式过滤器的滤芯设计中会在过滤层内、外设置多孔泡沫层或罩。
当含油质的气流经过滤中心层的作用放射状地流人柔韧的内多孔泡沫套层。它一方面对气流起到分散器、预过滤器和空间稳定器的作用；另一方面通过自身调整改变气流(扩张或收缩)，使气流对过滤层产生柔和压力，保证其工作时完整而有效。
气流经过滤层时，油滴被拦截和收集。油聚集后，经过一层硬质金属管流到外层多孔泡沫罩(套在金属管外)。外层多孔泡沫罩具有较大的不吸收表面，可使油迅速覆盖在其表面，在重力作用下．流至底部，从而阻止了油重回气流的情况产生。当油积聚在罩底(无气流死区)时，泡沫孔被堵满，油降至收集槽内.
Generally, porous foam layers or covers will be arranged inside and outside the filter layer in the filter element design of coalescing filters.
When oil-containing gas flows radially through the filter center layer, it flows into the flexible inner porous foam jacket layer. On one hand, it acts as a disperser, prefilter and space stabilizer for air flow. On the other hand, the air flow (expansion or contraction) is changed through self adjustment, so that the air flow generates soft pressure on the filter layer, thus ensuring the integrity and effectiveness of the filter layer during operation.
When the airflow passes through the filter layer, the oil droplets are intercepted and collected. After the oil accumulates, it flows through a layer of hard metal pipe to the outer porous foam cover (sleeved outside the metal pipe). The outer porous foam cover has a large non-absorbing surface, which enables the oil to quickly cover its surface and flow to the bottom under the action of gravity, thus preventing the oil from returning to the air flow. When oil accumulates at the bottom of the hood (no air flow dead zone), the foam holes are blocked up and the oil falls into the collecting tank.
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