Structure for assembling turbine blade seals, gas turbine including the same, and method of assembling turbine blade seals

A gas turbine comprising:

• a compressor configured to compress outside air;
• a combustor configured to mix fuel with the air compressed by the compressor to burn a mixture thereof;
• and
• a turbine configured to be rotated by combustion gas discharged from the combustor, wherein the turbine comprises:
• a turbine blade comprising an airfoil, a platform, and a root;
• a turbine rotor disk to which the root of the turbine blade is mounted;
• a seal plate mounted between the platform and one side of the turbine rotor disk to seal a cooling channel defined within the root and the platform;
• an insertion pin inserted through the turbine rotor disk and the seal plate to fix the seal plate to the turbine rotor disk;
• and
• a retainer configured to fix the insertion pin and to prevent the insertion pin from falling out,
• wherein the turbine rotor disk comprises:
• a mounting rib extending from one side thereof to form a mounting groove into which a radially inner end of the seal plate is inserted;
• and
• a through-hole formed through the mounting rib for insertion of the insertion pin,
• wherein the seal plate comprises a pinhole formed therethrough at a position corresponding to the through-hole of the mounting rib,
• wherein the insertion pin comprises:
• a cylindrical body;
• a head integrally formed at one side of the body and having an outer diameter larger than that of the body;
• a cutout formed on a bottom of the body and the head so that the retainer is pressed against the cutout;
• and
• a groove formed on the head, the groove being stepped from the cutout while extending thereto, and the retainer being pressed against the groove,
• wherein the turbine rotor disk comprises a head receiving hole formed on one side of the through-hole and having an inner diameter larger than the through-hole so that the head of the insertion pin is received in the head receiving hole,
• wherein the retainer is formed by bending a rectangular plate, and comprises:
• a horizontal portion that is bent by plastic deformation;
• a stepped portion connected from the horizontal portion in a stepped manner;
• and
• a vertical portion bent vertically from the stepped portion,
• wherein the head of the insertion pin is supported by a bent portion formed by bending a portion of the horizontal portion after the retainer is inserted into the through-hole of the mounting rib and the insertion pin is inserted into the through-hole, and
• wherein the bent portion is disposed inside the head receiving hole after bending and the retainer is not protruded from the outer surface of the mounting rib.

A method of assembling turbine blade seals comprising:

• inserting and mounting a root of a turbine blade in a slot of a turbine rotor disk;
• mounting a seal plate between a platform of the turbine blade and a mounting rib of the turbine rotor disk;
• inserting and mounting a retainer in a through-hole formed in the mounting rib;
• inserting and mounting an insertion pin in the through-hole of the mounting rib and a pinhole formed in the seal plate;
• and
• bending a portion of the retainer protruding from the mounting rib to support the insertion pin,
• wherein the turbine rotor disk comprises:
• a mounting rib extending from one side thereof to form a mounting groove into which a radially inner end of the seal plate is inserted;
• and
• a through-hole formed through the mounting rib for insertion of the insertion pin,
• wherein the seal plate comprises a pinhole formed therethrough at a position corresponding to the through-hole of the mounting rib,
• wherein the insertion pin comprises:
• a cylindrical body;
• a head integrally formed at one side of the body and having an outer diameter larger than that of the body;
• a cutout formed on a bottom of the body and the head so that the retainer is pressed against the cutout;
• and
• a groove formed on the head, the groove being stepped from the cutout while extending thereto, and the retainer being pressed against the groove,
• wherein the turbine rotor disk comprises a head receiving hole formed on one side of the through-hole and having an inner diameter larger than the through-hole so that the head of the insertion pin is received in the head receiving hole,
• wherein the retainer is formed by bending a rectangular plate, and comprises:
• a horizontal portion that is bent by plastic deformation;
• a stepped portion connected from the horizontal portion in a stepped manner;
• and
• a vertical portion bent vertically from the stepped portion,
• wherein the head of the insertion pin is supported by a bent portion formed by bending a portion of the horizontal portion after the retainer is inserted into the through-hole of the mounting rib and the insertion pin is inserted into the through-hole, and
• wherein the bent portion is disposed inside the head receiving hole after bending and the retainer is not protruded from the outer surface of the mounting rib.