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    • 5. 发明授权
    • Rotor blade damping structure for axial-flow turbine
    • 轴流式涡轮转子叶片阻尼结构
    • US5511948A
    • 1996-04-30
    • US320545
    • 1994-10-11
    • Atsuhide SuzukiHirotsugu KodamaToshio Suzuki
    • Atsuhide SuzukiHirotsugu KodamaToshio Suzuki
    • F01D5/26F01D5/22F01D5/30F01D5/32F03G4/00
    • F01D5/3046F01D5/225
    • In an axial-flow turbine, at least one of front and rear side contact surfaces of shrouds (3a or 3b) of blades (1a or 1b) with respect to the turbine rotational direction is formed at certain angle with respect to a radial line connecting the rotor center and the contact surface. The shroud (3a) of the blade (1a) of a first kind is formed in a trapezoidal shape converging radially outward in cross section taken in a plane perpendicular to the turbine axial direction, and the shroud (3b) of the blade (1b) of a second kind is formed in an inverted trapezoidal shape converging radially inward in the cross section. Further, half of an angle (2.alpha.) between the front and rear side contact surfaces of the shrouds (3a or 3b) is made smaller than a static frictional angle of the contact surface. Since the shroud contact surfaces of two adjacent blades can be kept in pressure contact with each other under all operating conditions, a large dynamic stress reduction and superior damping properties can be obtained without producing excessive initial stresses at the blade airfoil and blade dovetail attachment portion.
    • 在轴流涡轮机中,相对于涡轮机旋转方向,叶片(1a或1b)的护罩(3a或3b)的前后侧接触表面中的至少一个相对于连接到涡轮机的径向线形成一定角度 转子中心和接触面。 第一种叶片(1a)的护罩(3a)形成为在垂直于涡轮轴线方向的平面截取的横截面中径向向外收敛的梯形形状,并且叶片(1b)的护罩(3b) 第二种形式在横截面中以径向向内收敛的倒梯形形状。 此外,使护罩(3a或3b)的前侧和后侧接触表面之间的角度(2α)的一半被制成小于接触表面的静摩擦角。 由于两个相邻叶片的护罩接触表面可以在所有操作条件下彼此保持压力接触,所以可以获得大的动态应力减小和优异的阻尼性能,而不会在叶片翼型和叶片燕尾形连接部分处产生过大的初始应力。
    • 7. 发明授权
    • Forced-air cooling apparatus of steam turbine
    • 蒸汽轮机的强制空气冷却装置
    • US5388960A
    • 1995-02-14
    • US131593
    • 1993-10-05
    • Atsuhide SuzukiShinya AyanoYukio ShinozakiShigeo Hosoi
    • Atsuhide SuzukiShinya AyanoYukio ShinozakiShigeo Hosoi
    • F01D25/12F01D25/26F01D25/34F01D21/00F01D25/08
    • F01D25/12F01D25/26
    • A forced-air cooling apparatus is provided for a steam turbine which comprises an outer casing composed of upper and lower casing halves, an inner casing composed of upper and lower casing halves and disposed inside the outer casing and a rotor coaxially disposed inside the inner casing for forming a steam flow passage between the inner casing and the rotor and in which steam introduced into the steam flow passage from a steam inlet portion is impinged against blades of the rotor to impart a turning force thereto as a movable portion such as rotor with respect to a stationary portion such as an inner casing. The forced-air cooling apparatus comprises a cooling passage including a first cooling air passage formed between the inner casing and the rotor and a second cooling air passage formed between the outer casing and the inner casing, an external air inlet and outlet portion for charging external cooling air into the first and second cooling air passages during the turning operation period and discharging the cooling air after passing the first and second cooling air passages and a control unit for controlling the flow rate of the cooling air passing the first cooling air passage in response to a signal corresponding to a differential expansion detected by a differencial expansion detector between the movable portion and the stationary portion of the turbine and controlling a flow rate of the cooling air passing the second cooling air passage in response to a signal corresponding to a temperature difference between the upper and lower casing halves of the outer casing of the turbine.
    • 一种用于蒸汽轮机的强制空气冷却装置,包括由上下半壳构成的外壳,由上下半壳构成并设置在外壳内部的内壳和同轴地设置在内壳内的转子 用于在内壳和转子之间形成蒸汽流动通道,其中从蒸汽入口部分引入蒸汽流动通道的蒸汽撞击到转子的叶片上,以将作为可转动部分的转动力作为可转动部分,例如转子相对于 到诸如内壳的固定部分。 强制空气冷却装置包括冷却通道,其包括形成在内壳和转子之间的第一冷却空气通道和形成在外壳和内壳之间的第二冷却空气通道,外部空气入口和出口部分,用于向外部充电 在转动操作期间将空气冷却到第一和第二冷却空气通道中,并且在通过第一和第二冷却空气通道之后排出冷却空气;以及控制单元,用于控制响应于通过第一冷却空气通道的冷却空气的流量 对应于由可变部分和涡轮机的静止部分之间的差分膨胀检测器检测到的差动膨胀的信号,并且响应于对应于温差的信号控制通过第二冷却空气通道的冷却空气的流量 在涡轮机的外壳的上半壳体和下壳体之间。