成果報告書詳細
管理番号20140000000135
タイトル*平成25年度中間年報 水素利用技術研究開発事業 燃料電池自動車及び水素ステーション用低コスト機器・システム等に関する研究開発 水素ステーションの高圧水素用ホースとシールシステムに関する研究開発(6)
公開日2015/4/25
報告書年度2013 - 2013
委託先名NOK株式会社
プロジェクト番号P13002
部署名新エネルギー部
和文要約
英文要約Title:“Research and Development of Technology for Hydrogen Utilization/ Research and Development of Low-cost Equipment and System for Fuel Cell Vehicles and Hydrogen Stations/ Research and Development of Low-cost Equipment, System and their Materials for Hydrogen Stations/ Research and Development of High-pressure Hydrogen Hose and Sealing System for Hydrogen Stations/” FY2013 Annual Report from FY2013 to FY2015

A lot of rubber seals has been installed in all of high-pressure hydrogen equipments and is essential parts for hydrogen energy system. The rubber O-ring requires hydrogen sealability and fracture durability during pressure cyclic hydrogen behavior. In previous study, we found that silicone O-ring has higher durability for fracture damage by the short-term pressure cyclic test. However, seal durability should ideally be evaluated at a long-term pressure cycle test with a few thousand cycles for practical use. Despite the needs for long-term cycles, it isn’t possible to generalize a long-term seal durability assessment, due to the difficulty to reproduce a realistic condition and an environmental diversity like as high-pressure or low-temperature. In FY2013, we have evaluated high-pressure hydrogen sealability and durability of rubber O-ring. These new finding engineering knowledge are fed back to industrial products design and material development for hydrogen seal. (1) High-pressure hydrogen sealability of rubber O-ring in low-temperature environment. The TR10 levels are generally used as a target for estimated usable low-temperature seal limit of rubber seals. However rubber seals were exposed in high-pressure hydrogen, a seal performance under low-temperature environment was influenced by various factors such as deformation, swelling and blistering. This study determined a high-pressure hydrogen sealing or leakage behavior under low-temperature environment. The results showed that the seal limit temperature causing boundary leakage exists around TR10 level and silicone rubber has superior sealability in low-temperature environment.(2) Optimization of groove design for rubber O-ring. The factor on groove design of rubber O-ring is mainly squeezing rate and filling rate. In our study of O-ring at high pressure hydrogen gas condition, rubber O-ring was swelled for gas dissolution, then was overflowed to gap of housing or buckling in the groove. Therefore O-ring was broken and lost sealiblity. There is possibility for standard O-ring groove design not to be applied in high pressure hydrogen gas condition for volume increment. We studied the optimization of groove design for cylindrical-face seal that would be installed in many hydrogen devices. We evaluated durability of cylindrical static seal with back-up-ring at short-term pressure cycle test. In a range of compressibility at 8-30% and filling rate 50-90%, O-ring had no break like squeeze-out, buckling and blistering.
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