US 11,814,985 B2
Turbine blade, and turbine and gas turbine including the same
Jin Woo Song, Changwon (KR); Jin Ho Bae, Gimhae (KR); Ki Baek Kim, Yongin (KR); Sung Chul Jung, Daejeon (KR); and Jae Yeon Choi, Busan (KR)
Assigned to DOOSAN ENERBILITY CO., LTD., Changwon (KR)
Filed by DOOSAN ENERBILITY CO., LTD., Changwon-si (KR)
Filed on Sep. 14, 2022, as Appl. No. 17/932,214.
Claims priority of application No. 10-2021-0169167 (KR), filed on Nov. 30, 2021.
Prior Publication US 2023/0167744 A1, Jun. 1, 2023
Int. Cl. F01D 5/30 (2006.01)
CPC F01D 5/3007 (2013.01) [F05D 2240/80 (2013.01); F05D 2250/294 (2013.01); F05D 2260/36 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A turbine blade comprising:
an airfoil having an airfoil cross-section and extending radially;
a platform disposed radially inward from the airfoil;
a root member disposed radially inward from the platform and having a decreased width as the root member is directed radially inward;
a plurality of dovetails formed on both circumferential sides of the root member and each having a contact surface formed on a radially outer surface thereof, the plurality of dovetails being arranged radially in sequence; and
a groove part formed on at least one axial side of the root member, the groove part being recessed from a surface of the root member in an axial direction and extending circumferentially therein,
wherein the groove part is formed at a height corresponding to a radially outermost dovetail in the root member, and comprises a planar portion having a flat surface formed in at least a portion thereof,
wherein the groove part further comprises a first section, a second section, and a third section arranged radially inwardly in sequence and formed continuously in sequence, the first section being recessed and inclined from the surface of the root member in the axial direction and connected to the surface of the root member, the second section being the planar portion, and the third section being recessed and inclined from the surface of the root member in the axial direction and connected to the surface of the root member,
wherein all of the first, second and third sections are formed within a range of the height correspondingly to the radially outermost dovetail in the root member.