SEAL DEVICE FOR ROTARY FLUID MACHINE AND ROTARY FLUID MACHINE

摘要

The invention provides a sealing device for a rotary fluid machine and a rotary fluid machine that reduce a decrease in efficiency and suppress swirling stall in a multistage rotary fluid machine. The sealing device includes a housing (2) that rotatably accommodates a rotary shaft (3); a plurality of guide parts (31) that extend along at least one of a radial direction and an axial direction of the rotary shaft (3) and that impart flow velocity components in the rotation direction of the rotary shaft (3) to fluid passing through therebetween; a partition part (32) that connects ends of the plurality of guide parts (31) and that serves as a partition between spaces between the plurality of guide parts (31) and an outside space; a first seal part (34) that is an annular protrusion extending in the radial direction, that forms a first gap (36) with respect to the rotary shaft (3) or the housing (2), and that blocks fluid flowing toward the plurality of guide parts (31); and a second seal part (33) that is an annular protrusion, that forms a second gap (35) with respect to the rotary shaft (3) or the partition part (32), and that blocks fluid flowing through the outside space.