Rotation axis seal device and helium gas turbine power generation system using the same

摘要

An axis seal device (8) is provided between a vessel (3) filled with a first gas of a first gas pressure and a rotation axis (6) passing through the vessel (3). The axis seal device (8) includes first (22) to third (39) dry gas seal sections. The first dry gas seal section (22) is provided such that the rotation axis (6) is rotatable, and has a first space (21) section with a second gas pressure. The second dry gas seal section (32) is provided subsequently to the first dry gas seal section (22) such that the rotation axis (6) is rotatable, and has a second space section (36) with a third gas pressure. The third dry gas seal section (39) is provided subsequently to the second dry gas seal section (32) such that the rotation axis (6) is rotatable, and has a third space section (40) with a fourth gas pressure. The first gas pressure is lower than the second gas pressure, the second gas pressure is higher than the third gas pressure, the third gas pressure is higher than the fourth gas pressure and an atmospheric pressure, and the fourth gas pressure is lower than the atmospheric pressure. <IMAGE>