Improvement of Seal Performance and Addition of Seal Functions to Mechanical Seals under High-Speed Conditions

The aim of the present study is to develop a new structure of a mechanical seal under high-speed and low-temperature conditions. The existing seal is a floating-ring seal for use in low-temperature compressors or turbines such as liquid natural gas. However, this seal requires expensive supporting equipment in order to maintain differential pressure between seal fluid and carrying gas. We present a new structure of a mechanical seal and confirm by experiments that this seal has acceptable seal-performance at high speed and can be use when the differential pressure loaded a seal face repeats under positive and negative value, and this seal keeps reliability under emergency conditions of low temperature turbo-machinerys.