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

Claim 4:
5. A method for manufacturing a sealing device including a sealing main body that surrounds a rotor shaft rotating about an axis from an outer periphery side and includes 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 design method comprising:
a fluid force distribution acquiring step of acquiring a fluid force distribution of fluid flowing into the clearance from the direction of the axis;
a groove forming region determining step of dividing the inside surface into a groove forming region and a non-groove forming region in accordance with the fluid force distribution;
a first hole part setting step of disposing, in the groove forming region, the plurality of hole parts having an inner peripheral wall in which a spiral groove extending twisting toward the outer side in the radial direction is formed; and
a second hole part setting step of disposing, in the non-groove forming region, the plurality of hole parts having an inner peripheral wall in which the spiral groove is not formed.