Patent ID: 11927195
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 3:
4. A rotary machine, comprising:
a sealing device including a sealing main body surrounding a rotor shaft rotating about an axis from an outer periphery side; and
a casing surrounding the rotor shaft from an outer periphery side and supporting the sealing device that separates a high-pressure-side space on one side in the direction of the axis from a low-pressure-side space on another side in the direction of the axis,
the sealing main body including:
an inside surface facing an outside surface of the rotor shaft with clearance; and
a plurality of hole parts formed recessed to an outer side in a radial direction from the inside surface and arrayed in a circumferential direction of the inside surface and in a direction of the axis,
the plurality of hole parts including:
a plurality of holes with a groove having an inner peripheral wall in which a spiral groove extending twisting toward the outer side in the radial direction is formed; and
a plurality of holes without a groove having an inner peripheral wall in which the spiral groove is not formed, wherein
a proportion of the plurality of holes with a groove to the plurality of hole parts arrayed in the circumferential direction of the inside surface increases toward the high-pressure-side space side.