Biomimetic Shaft Seal for Ocean Current or Tidal Power Generation
Biomimetic Shaft Seal for Ocean Current or Tidal Power Generation
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用于洋流或潮汐发电的仿生轴密封
DOI：
10.1109/icrera.2018.8566721
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Honda T
中科院分区：
文献类型：
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作者：
Nakanishi Y;Nakashima Y;Yoshioka Y;Honda T
设计了两种类型的仿生轴封，以将该项目用于洋流和潮汐发电系统，其中需要通过旋转轴实现水和空气之间的完美分离。提出了一种仿生密封环。这是由PVF（聚乙烯醇缩甲醛）制成的。它模仿了天然关节软骨的结构和润滑机制。将PVF环连接到旋转轴上，并将其压到用机械体固定的陶瓷环上。经证实，仿生轴封的设计概念在验证测试中是成功的，其中轴的转速在0.5 MPa的加压水下从5，000转/分钟（min-1）变化到-5，000转/分钟（min-1）。然而，仿生轴封仍有改进的空间：1）为了抑制动密封面的间隙流动，应避免PVF环的塑性变形。2)应讨论作为PVF环配合面的陶瓷表面的表面轮廓，因为该轮廓可以促进动态密封面处的水合润滑和PVF环的不可忽略的磨损。3)应避免在动态密封面处产生热量，因为热量会改变PVF环的材料特性。
Two types of biomimetic shaft seal were designed in order to adopt this item for ocean current and tidal power generation systems, where perfect separation between water and air with a rotating shaft was required. A biomimetic seal ring was proposed. This was made of a PVF (polyvinyl formal). It imitated the structure and lubrication mechanism of a natural articular cartilage. The PVF ring was attached to the rotating shaft was pressed to the ceramic ring fixed with a mechanical body. It was confirmed that the design concept of the biomimetic shaft seal was successful in verification tests where the rotation speed of the shaft changed from 5,000 to -5,000 revolutions per minute (min-1) under pressurized water of 0.5 MPa. However, there was room for improvement in the biomimetic shaft seal: 1) Plastic deformation of the PVF ring should be avoided in order to inhibit the clearance flow in the dynamic seal face. 2) The surface profile of the ceramics surface as a counterface of the PVF ring should be discussed because the profile can promote both hydrated lubrication at the dynamic seal face and the nonnegligible wear of the PVF ring. 3) Heat generation at the dynamic seal face should be avoided because the heat changes the material property of the PVF ring.