Sealing structure for turbines, and turbine and gas turbine having the same

A turbine comprising:

• a rotor comprising a plurality of turbine disks and a plurality of turbine blades respectively coupled to an outer surface of each of the plurality of turbine disks;
• a stator comprising a casing for housing the rotor, a plurality of vanes installed on an inner circumferential surface of the casing and disposed between the plurality of turbine blades, and a vane sealing assembly installed on an end of each of the plurality of vanes;
• and
• a sealing structure configured to prevent combustion gas passing through the plurality of turbine blades from being drawn into an internal space between a turbine disk of the plurality of turbine disks and the vane sealing assembly, the sealing structure comprising:
• a mounting plate mounted to the sealing housing, the mounting plate having a planar shape and including a first mounting flange formed at a radially outer end of the mounting plate and a second mounting flange formed at a radially inner end of the mounting plate;
• and
• a plurality of baffles protruding from the mounting plate toward the turbine disk, the plurality of baffles spaced apart from each other and arranged in a radial direction between the first and second mounting flanges,
• wherein each of the plurality of baffles has a distal end disposed toward the turbine disk and a length measured from a surface of the mounting plate to the distal end, the respective lengths of the plurality of baffles being different from each other and gradually increasing from the radially outer end of the mounting plate to the radially inner end of the mounting plate, and wherein the plurality of baffles includes a shortest baffle disposed nearest the radially outer end of the mounting plate,
• wherein the vane sealing assembly comprises:
• a shroud coupled to the end of one of the plurality of vanes;
• and
• a sealing housing configured to seal a gap between the turbine disk and another turbine disk adjacent to the turbine disk, the shroud coupled to the shroud, the sealing housing including a first surface facing the turbine disk and a second surface facing the other turbine disk adjacent to the turbine disk, and
• wherein the sealing structure is mounted on each of the first and second surfaces of the sealing housing.

A gas turbine comprising:

• a compressor configured to draw in air and compress the drawn air;
• a combustor configured to produce combustion gas by combusting a mixture of fuel and the compressed air;
• and
• a turbine comprising:
• a rotor configured to be rotated by the combustion gas, the rotor comprising a plurality of turbine disks and a plurality of turbine blades respectively coupled to an outer surface of each of the plurality of turbine disks;
• a stator comprising a casing for housing the rotor, a plurality of vanes installed on an inner circumferential surface of the casing and disposed between the plurality of turbine blades, and a vane sealing assembly installed on an end of each of the plurality of vanes;
• and
• a sealing structure configured to prevent combustion gas passing through the plurality of turbine blades from being drawn into an internal space between a turbine disk of the plurality of turbine disks and the vane sealing assembly, the sealing structure comprising:
• a mounting plate mounted to the sealing housing, the mounting plate having a planar shape and including a first mounting flange formed at a radially outer end of the mounting plate and a second mounting flange formed at a radially inner end of the mounting plate;
• and
• a plurality of baffles protruding from the mounting plate toward the turbine disk, the plurality of baffles spaced apart from each other and arranged in a radial direction between the first and second mounting flanges,
• wherein each of the plurality of baffles has a distal end disposed toward the turbine disk and a length measured from a surface of the mounting plate to the distal end, the respective lengths of the plurality of baffles being different from each other and gradually increasing from the radially outer end of the mounting plate to the radially inner end of the mounting plate, and wherein the plurality of baffles includes a shortest baffle disposed nearest the radially outer end of the mounting plate,
• wherein the vane sealing assembly comprises:
• a shroud coupled to the end of one of the plurality of vanes;
• and
• a sealing housing configured to seal a gap between the turbine disk and another turbine disk adjacent to the turbine disk, the shroud coupled to the shroud, the sealing housing including a first surface facing the turbine disk and a second surface facing the other turbine disk adjacent to the turbine disk, and
• wherein the sealing structure is mounted on each of the first and second surfaces of the sealing housing.