Steam turbine rotor, inverted fir-tree turbine blade, low pressure steam turbine with those rotors and blades, and steam turbine power plant with those turbines
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01D-005/30
출원번호
UP-0529231
(2006-09-29)
등록번호
US-7794208
(2010-10-04)
우선권정보
JP-2005-285734(2005-09-30)
발명자
/ 주소
Suzuki, Fumiyuki
Asai, Kunio
Kudo, Takeshi
Nakamura, Tateki
출원인 / 주소
Hitachi, Ltd.
대리인 / 주소
Brundidge & Stanger, P.C.
인용정보
피인용 횟수 :
5인용 특허 :
11
초록▼
In a turbine rotor, a rotor radial-direction hook length (Hri) of an i-th rotor hook counting from the outermost circumference of the rotor and a blade radial-direction hook length (Hbi) of an i-th blade hook counting from the outermost circumference of the blade are set to satisfy the relationship
In a turbine rotor, a rotor radial-direction hook length (Hri) of an i-th rotor hook counting from the outermost circumference of the rotor and a blade radial-direction hook length (Hbi) of an i-th blade hook counting from the outermost circumference of the blade are set to satisfy the relationship of (Hri>Hbi). In the turbine blade, a rotor circumference-direction neck width (Wri) of an i-th rotor neck counting from the outermost circumference of the rotor and a blade circumference-direction neck width (Wbi) of an i-th blade neck counting from the innermost circumference of the blade are set to satisfy the relationship of (Wri>Wbi).
대표청구항▼
What is claimed is: 1. A steam turbine rotor having rotor hooks and rotor necks which have an attachment structure with respect to an inverted fir-tree blade root having blade hooks and blade necks, wherein a rotor material has lower tensile strength than a blade material, and a rotor radial-direct
What is claimed is: 1. A steam turbine rotor having rotor hooks and rotor necks which have an attachment structure with respect to an inverted fir-tree blade root having blade hooks and blade necks, wherein a rotor material has lower tensile strength than a blade material, and a rotor radial-direction hook length (Hri) of said rotor hook from an interface between a rotor hook contact surface contacting with said blade hook and an inscribed circular surface of said rotor neck is larger than a blade radial-direction hook length (Hbi) of said blade hook from an interface between a blade hook contact surface contacting with said rotor hook contact surface and an inscribed circular surface of said blade neck, and a rotor circumferential-direction neck width (Wri) of said rotor neck at a predetermined position counting from the outermost circumference of the rotor is larger than a blade circumferential-direction neck width (Wbi) of said blade neck at a corresponding position of the same number as said rotor neck counting from the innermost circumference of the blade. 2. The steam turbine rotor according to claim 1, wherein a rotor radial-direction hook length (Hrn) of said rotor hook at the innermost circumference and a rotor radial-direction hook length (Hrj) of an intermediate one of said rotor hooks satisfy a relationship of Hrn>Hrj (j=2 to n−1). 3. The steam turbine rotor according to claim 1, wherein a tensile strength ratio a between a blade material and a rotor material (blade material tensile strength/rotor material tensile strength) and a ratio β of (Hri/Hbi) are set to satisfy: 1.0<β≦1.1α. 4. The steam turbine rotor according to claim 1, wherein said rotor hook has said contact surface contacting with said blade hook and a non-contact surface not contacting with said blade hook, said contact surface and said non-contact surface being interconnected by an inscribed circular surface. 5. The steam turbine rotor according to claim 1, wherein said rotor hook has said contact surface contacting with said blade hook and a non-contact surface not contacting with said blade hook, said contact surface and said non-contact surface being interconnected by a flat surface and inscribed circular surfaces on both sides of said flat surface. 6. The steam turbine rotor according to claim 1, wherein an insert angle at which said blade is inserted is skewed relative to the axial direction of said rotor. 7. A steam turbine rotor including rotor hooks and rotor necks which have an attachment structure with respect to an inverted fir-tree blade root having blade hooks and blade necks, wherein a rotor material has lower tensile strength than a blade material, and a rotor radial-direction hook length (Hri) of said rotor hook from an interface between a rotor hook contact surface contacting with said blade hook and an inscribed circular surface of said rotor neck is larger than a blade radial-direction hook length (Hbi) of said blade hook from an interface between a blade hook contact surface contacting with said rotor hook contact surface and an inscribed circular surface of said blade neck. 8. A steam turbine rotor including rotor hooks and rotor necks which have an attachment structure with respect to an inverted fir-tree blade root having blade hooks and blade necks, wherein a rotor material has lower tensile strength than a blade material, and a rotor circumferential-direction neck width (Wri) of said rotor neck at a predetermined position counting from the outermost circumference of the rotor is larger than a blade circumferential-direction neck width (Wbi) of said blade neck at a corresponding position of the same number as said rotor neck counting from the innermost circumference of the blade. 9. An inverted fir-tree turbine blade having blade hooks and blade necks which have an attachment structure with respect to a turbine rotor having rotor hooks and rotor necks, wherein a blade material has higher tensile strength than a rotor material, and a blade radial-direction hook length (Hbi) of said blade hook from an interface between a blade hook contact surface contacting with said rotor hook and an inscribed circular surface of said blade neck is smaller than a rotor radial-direction hook length (Hri) of said rotor hook from an interface between a rotor hook contact surface in a position contacting with said blade hook contact surface and an inscribed circular surface of said rotor neck. 10. An inverted fir-tree turbine blade having blade hooks and blade necks which have an attachment structure with respect to a turbine rotor having rotor hooks and rotor necks, wherein a blade material has higher tensile strength than a rotor material, and a blade circumferential-direction neck width (Wbi) of said blade neck at a predetermined position counting from the innermost circumference of the blade is smaller than a rotor circumferential-direction neck width (Wri) of said rotor neck at a corresponding position of the same number as said blade neck counting from the outermost circumference of the blade.
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이 특허에 인용된 특허 (11)
Evans Neil M. (Bristol GB2), Attachment of a gas turbine engine blade to a turbine rotor disc.
Scalzo Augustine J. (Philadelphia PA) Gunderlock Richard P. (Chester Township PA), Rotor disk, blade, and seal plate assembly for cooled turbine rotor blades.
Bluck, Richard; Butler, David; Overton, David, Turbomachine rotor blade, turbomachine rotor disc, turbomachine rotor, and gas turbine engine with different root and slot contact face angles.
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