Turbine stator, turbine, and gas turbine including the same

A turbine to generate power for generation of electric power by passing combustion gas supplied from a combustor, the turbine comprising:

• a stator into which combustion gas supplied from the combustor flows, and
• a rotor installed inside the stator and configured to rotate by the flow of the combustion gas,
• wherein the stator comprises:
• a casing including first and second casings constituting respective casing halves, the casing having a contact surface between the first and second casings, and a fastening groove formed on at least one contact surface of the first casings and the second casings, the fastening groove having an elongated shape extending radially with respect to the casing in a longitudinal direction of the fastening groove;
• a plurality of vane airfoils configured to be installed on an inner peripheral surface of the casing and arranged in a multi-stage manner in a flow direction of the combustion gas;
• a plurality of vane shrouds arranged between the casing and the plurality of vane airfoils and configured to be coupled to the plurality of vane airfoils, respectively;
• an inner peripheral groove circumferentially formed on the inner peripheral surface of the casing and configured to receive the vane shrouds in order to fix the vane airfoils to the casing;
• a first vane shroud of the plurality of vane shrouds coupled to a first vane airfoil of the plurality of vane airfoils;
• and
• a stop that extends outward radially from one end of the first vane shroud and is configured to be fixed with respect to a vane airfoil of the plurality of vane airfoils and to be inserted into the elongated shape of the fastening groove to fix the vane airfoil to the casing.

A gas turbine comprising a compressor to suck and compress air, a combustor to mix compressed air supplied from the compressor with fuel for combustion, and a turbine to generate power for generation of electric power by passing combustion gas supplied from the combustor,

• wherein the turbine comprises a stator into which combustion gas supplied from the combustor flows, and a rotor installed inside the stator and configured to rotate by the flow of the combustion gas, and
• wherein the stator comprises:
• a casing including first and second casings constituting respective casing halves, the casing having a contact surface between the first and second casings, and a fastening groove formed on at least one contact surface of the first casings and the second casings, the fastening groove having an elongated shape extending radially with respect to the casing in a longitudinal direction of the fastening groove;
• a plurality of vane airfoils configured to be installed on an inner peripheral surface of the casing and arranged in a multi-stage manner in a flow direction of the combustion gas;
• a plurality of vane shrouds arranged between the casing and the plurality of vane airfoils and configured to be coupled to the plurality of vane airfoils, respectively;
• an inner peripheral groove circumferentially formed on the inner peripheral surface of the casing and configured to receive the vane shrouds in order to fix the vane airfoils to the casing;
• a first vane shroud of the plurality of vane shrouds coupled to a first vane airfoil of the plurality of vane airfoils;
• and
• a stop that extends outward radially from one end of the first vane shroud and is configured to be fixed with respect to a vane airfoil of the plurality of vane airfoils and to be inserted into the elongated shape of the fastening groove to fix the vane airfoil to the casing.