Last stage movable blade for steam turbine of water feeding pump
A technology for feed water pump steam turbines and moving blades, which is applied in the direction of machines/engines, blade support components, mechanical equipment, etc., to achieve good aerodynamic performance and high strength performance
Active Publication Date: 2020-10-30
北京国能龙威发电技术有限公司
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Problems solved by technology
[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a final-stage moving blade for a feedwater pump steam turbine, which solves the problem that the existing final-stage moving blade cannot work under high and low back pressure conditions, and can Technical issues of safe operation under high load conditions
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[0036] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings. Among them, the orientation nouns such as "up", "down", "left", "right" mentioned in this article are preceded by figure 1 orientation as a reference.
[0037] This embodiment provides a last-stage moving blade 10 for a feedwater pump steam turbine, and the last-stage moving blade 10 is installed on a rotor impeller 20 . refer to figure 1 , the final rotor blade 10 includes a blade body 1 , a blade root 2 , a blade tie hole 3 , a circumferential positioning pin hole 4 and a local laser surface strengthening part 5 .
[0038] The effective height of the airfoil 1 is 186 mm, and the root diameter is Φ750 mm, which is twice the distance from the root U section of the airfoil 1 to the axis of the rotor impeller 20 .
[0039] The middle part of the blade body 1 is ...
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The invention relates to a last stage movable blade for a steam turbine of a water feeding pump. The last stage movable blade comprises a blade body and a blade root. A contour molded line of a characteristic cross section of the blade body is formed by encircling an inner arc-shaped line and a back arc-shaped curve and has a characteristic parameter section area, an axial maximum width B, a mounting angle C, a chord length, the maximum thickness and a steam outlet edge thickness delta; the relative value of an effective height is monotonically increased from 0.0 to 1.0 from the section of theroot to the top section. Correspondingly, the relative value A of the section area is equal to -2.836*H+3.836, the axial maximum width B is equal to -52*H+102, the steam outlet edge thickness delta is equal to -0.23*H+1.232, the mounting angle C is equal to -29.864 degrees*H+79.397 degrees, the relative value D of the chord length is equal to -0.496*H+1.496, and the relative value E of the maximum thickness is -0.877*H+1.877. The last stage movable blade is good in pneumatic performance and high in strength performance, can operate safely under different working conditions that the steam turbine of the water feeding pump is at a low back pressure and a low back pressure, and can meet the output demand of the steam turbine of the water feeding pump.
Description
technical field [0001] The invention relates to the technical field of a feedwater pump steam turbine, in particular to a final-stage moving blade for a feedwater pump steam turbine. Background technique [0002] With the increasing pressure of energy saving and emission reduction in my country's thermal power enterprises, it is particularly important to carry out the transformation of low pressure cylinder and high back pressure heating for some high energy consumption pure condensing units. After the pure condensing unit is transformed into low-pressure cylinder and high back-pressure heating, during the heating period, the main steam turbine unit replaces the original low-pressure pure condensing rotor with a high back-pressure rotor, and the main steam turbine unit operates in the low-pressure cylinder high back-pressure heating mode; in Africa During the heat supply period, the main steam turbine unit still uses the original low-pressure pure condensing rotor, and resum...
Claims
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IPC IPC(8): F01D5/28F01D5/14F01D5/30
CPCF01D5/28F01D5/30F01D5/141F01D5/147F01D5/3007F01D5/3053Y02E20/14
Inventor 王学博田东亮孙秀君张宇赵丽华
Owner 北京国能龙威发电技术有限公司