부산대학교 도서관

A seal application for an advanced flywheel system where housing pressure (vacuum) is equal to 10/sup -4/ torr, is being investigated. Many conventional types of seals can be ruled out due to such extreme pressure conditions. For a dynamic seal to work successfully, it should develop a compression ratio of /sup 6/10 magnitude during its normal operation. In view of this, the principle of molecular vacuum pumps, where pressure ratios of this magnitude are obtainable, is being examined. It is believed that a flywheel seal system based upon molecular vacuum pump principles on the vacuum side and upon viscous flow principles on the high-pressure side, can be developed. For future work, a design study is recommended where the concepts of molecular drag and turbo pumps are combined with one of the conventional configurations of the viscous pumping seal. Two conceptual arrangements incorporating these principles are included in the recommendations.