阅读说明：本技术 用于半转速核电汽轮机的2000mm末级动叶片 (2000mm last-stage moving blade for half-speed nuclear turbine ) 是由 刘云锋 郭魁俊 管继伟 李宇峰 马义良 关淳 王丽华 梁天赋 李央 武芏茳 潘春 于 2020-08-19 设计创作，主要内容包括：用于半转速核电汽轮机的2000mm末级动叶片,涉及一种用于半转速核电汽轮机的末级动叶片。目的是解决现有的末级叶片无法满足大功率机组的需求的问题。叶片工作部分的型线为变截面扭叶片,叶片工作部分的高度L为2000mm,叶片工作部分的根部轴向宽度V为413.65mm,叶片工作部分的根部直径为<Image he="58" wi="232" file="DDA0002640474240000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>叶片工作部分的排汽面积13.61m<Sup>2</Sup>,围带的厚度H为40mm,围带工作面轴向距离B1为98.58mm。本发明采用了弯扭联合成型全三维设计,动叶沿叶高扭曲形成扭曲长叶片级,叶片顶部采用自带围带,减少损失和漏气,提高机组效率,运行安全可靠。本发明适用于制备半转速核电汽轮机末级动叶片。(A2000 mm last stage moving blade for half rotational speed nuclear power steam turbine relates to a last stage moving blade for half rotational speed nuclear power steam turbine. The problem that the requirement of high-power unit can not be satisfied to current last stage blade is solved in the purpose. The profile of the working part of the blade is a twisted blade with variable cross section, the height L of the working part of the blade is 2000mm, the axial width V of the root of the working part of the blade is 413.65mm, and the diameter of the root of the working part of the blade is 413.65mm The steam discharge area of the working part of the blade is 13.61m 2 The shroud has a thickness H of 40mm and a shroud face axial distance B1 of 98.58 mm. The invention adopts the bending-twisting combined forming full three-dimensional design, the movable blades are twisted along the blade height to form twisted long blade stages, and the tops of the blades are adoptedThe self-carrying shroud ring is used, so that loss and air leakage are reduced, the unit efficiency is improved, and the operation is safe and reliable. The method is suitable for preparing the final-stage moving blade of the half-rotating-speed nuclear turbine.)

1. the utility model provides a 2000mm last stage moving blade for half rotational speed nuclear power steam turbine which characterized in that: a2000 mm last stage moving blade for half rotational speed nuclear power steam turbine comprises blade working part (1), blade root (2), shroud (3) and boss lacing wire (4), shroud (3), blade working part (1), blade root (2) and boss lacing wire (4) are swaged from top to bottom and become integrative, the molded lines of blade working part (1) are the variable cross section and turn round the blade, there is relative torsion between two adjacent sections promptly, blade working part (1) reduces from the sectional area at root to top gradually, the height L of blade working part (1) is 2000mm, the root axial width V of blade working part (1) is 413.65mm, the root diameter of blade working part (1) is forThe steam discharge area of the working part (1) of the blade is 13.61m²The thickness H of the shroud ring (3) is 40mm, and the axial distance B1 of the working surface of the shroud ring (3) is 98.58 mm.

2. The 2000mm last stage moving blade for a half speed nuclear power turbine according to claim 1, wherein: root of blade working part (1)The range of variation from the axial width V of the part to the axial width V1 of the top part of the blade working part (1) is 413.65 mm-95.36 mm, the range of variation of the chord length b is 417.98 mm-343.55 mm, and the installation angle beta_yThe variation range of the angle is 82.3-15.84 degrees, the variation range of the maximum thickness T of the molded line is 46.39-12.74 mm, the variation range of the inlet angle alpha is 56.72-161.1 degrees, and the variation range of the outlet angle theta is 38.32-24.9 degrees.

3. The 2000mm last stage moving blade for a half speed nuclear power turbine according to claim 1, wherein: the axial widths V of the blade working parts (1) corresponding to the positions of the height L of the blade working parts (1) of 0mm, 400mm, 800mm, 1300mm, 1800mm and 2000mm are respectively as follows: 413.65mm, 328.61mm, 259.48mm, 176.85mm, 107.58mm and 95.36mm, and the corresponding chord lengths b are respectively as follows: 417.98mm, 338.55mm, 304.56mm, 315.8mm, 336.95mm and 343.55mm, and corresponding installation angle beta_ySequentially and respectively: 82.3 degrees, 76.49 degrees, 58.56 degrees, 33.91 degrees, 18.33 degrees and 15.84 degrees, and the maximum thickness T of the corresponding molded lines are respectively as follows: 46.39mm, 51.75mm, 44.48mm, 24.97mm, 16.33mm and 12.74mm, and the corresponding inlet angles alpha are respectively as follows: 56.72 °, 46.15 °, 66.75 °, 123.53 °, 153.52 °, and 161.1 °, the corresponding exit angles θ are respectively: 38.32 °, 37.69 °, 33.2 °, 27.16 °, 24.49 °, 24.9 °.

4. The 2000mm last stage moving blade for a half speed nuclear power turbine according to claim 1, wherein: the total height K of the blade root (2) is 173.32 mm.

5. The 2000mm last stage moving blade for a half speed nuclear power turbine according to claim 1, wherein: the blade root (2) is a helical tooth fir tree blade root, and the axial width W of the blade root (2) is 470 mm.

Technical Field

The invention relates to a 2000mm last-stage moving blade for a half-speed nuclear turbine.

Background

The nuclear turbine has the advantages of no emission of greenhouse gases polluting the atmosphere, and low electricity production price, so that various turbine manufacturers in the world develop high-power nuclear turbine units. Because the power generated by the last-stage blade accounts for more than 10% of the whole machine, the last-stage blade has important effects on developing a high-power steam turbine and improving the economy of a unit. A final-stage long blade which is reliable in operation and high in efficiency is designed, and the design method is a basis for developing a high-power unit. When the unit power is larger, the annual average load rate is higher, and the back pressure is lower, the steam exhaust area of the last stage blade is required to be larger correspondingly, the blades are higher, and the residual speed loss is smaller. With the increasing demand for nuclear power turbosets with larger capacity, the development of nuclear power half-speed last-stage long blades with larger steam exhaust area and longer length becomes a necessary development trend. In order to develop a nuclear power steam turbine set with capacity of 1700MW and above, a 2000mm last-stage length blade is developed and designed.

Disclosure of Invention

The invention provides a 2000mm last-stage moving blade for a half-speed nuclear turbine, aiming at solving the problem that the existing last-stage blade cannot meet the requirement of a high-power unit.

The 2000mm last-stage moving blade for the half-speed nuclear turbine consists of a blade working part, a blade root, a shroud and a boss lacing wire, wherein the shroud, the blade working part, the blade root and the boss lacing wire are die forged into a whole from top to bottom, the molded line of the blade working part is a twisted blade with a variable cross section, namely, the relative twisting is arranged between two adjacent cross sections, the cross section area of the blade working part from the root to the top is gradually reduced, the height L of the blade working part is 2000mm, the axial width V of the root of the blade working part is 413.65mm, and the diameter of the root of the blade working part is 413.65mmThe steam discharge area of the working part of the blade is 13.61m²The thickness H of the shroud 3 is 40mm, and the axial distance B1 between the working faces of the shroud 3 is 98.58 mm.

The principle and the beneficial effects of the invention are as follows:

1. the 2000mm long blade is based on one-dimensional/quasi-three-dimensional/full-three-dimensional pneumatic and thermodynamic analysis and calculation, a bending-twisting combined forming full-three-dimensional design is adopted, the moving blade is twisted along the blade height to form a twisted long blade stage, and the top of the blade is provided with a shroud, so that loss is reduced, air leakage is reduced, and the unit efficiency is improved; convenient assembly and safe and reliable operation. The invention is applied to the 1000MW and above-grade half-rotating speed nuclear power steam turbine unit, can meet the requirement of a high-capacity nuclear power steam turbine unit, and greatly enhances the market competitiveness.

2. The invention adopts comprehensive optimization of fluid power and structural strength, solves the optimization problem of pneumatic/structural integrated design, and optimizes the flow efficiency and the strength vibration characteristic of the 2000mm blade.

3. The last-stage impeller of the steam turbine is provided with 70 moving blades, and the economic efficiency, the strength vibration characteristic, the static strength and the safety and the reliability of the unit are all advanced.

4. The 2000mm moving blade is connected by adopting the boss lacing wires and the self-shrouded damping shroud, the inclined tooth fir-shaped blade root ensures the connecting strength of the blade, the design of the shroud, the blade root and the lacing wires is more precise, and the safety and the high efficiency of the unit are ensured.

Drawings

Fig. 1 is a schematic view showing the overall structure of the present invention, fig. 2 is a top view of a shroud band 3, fig. 3 is a top view of a boss lacing wire 4, fig. 4 is a schematic view showing a typical cross section of a blade working portion 1, fig. 5 is an enlarged view of a part ii of fig. 4, and fig. 6 is an enlarged view of a part i of fig. 4.

Detailed Description

The technical scheme of the invention is not limited to the specific embodiments listed below, and any reasonable combination of the specific embodiments is included.