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Full level steam turbine short movable vane without frequency modulation

A technology of steam turbines and short blades, which is applied to machines/engines, supporting elements of blades, mechanical equipment, etc., and can solve the problems of difficult calculation and accuracy of vibration and difficult to grasp vibration characteristics.

Inactive Publication Date: 2009-01-21
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for short frequency-modulated blades (usually referring to the height of the steam channel below 200mm), due to the short blade, the rigidity of the root connection, the shear force and the moment of inertia and other factors have a great influence on the natural frequency of the blade, so its vibration is very difficult. It is difficult to calculate accurately, and its vibration characteristics are difficult to grasp

Method used

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  • Full level steam turbine short movable vane without frequency modulation
  • Full level steam turbine short movable vane without frequency modulation
  • Full level steam turbine short movable vane without frequency modulation

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Embodiment Construction

[0021] see Figure 7 : the moving blade 20 of the steam turbine is mounted on the impeller 10.

[0022] Referring to Fig. 1 to Fig. 4: the blade 20 has a blade body 1, a blade root 2, and a blade crown 3, and the three are integral structures. Wherein, the blade root 2 has a blade root profile part 2.1 and an intermediate part 2.2, and the two parts are integral structures. The height dimension of the root profile part 2.1 is L.

[0023] The main feature of the present invention is: blade 20 is designed into two kinds, namely A, B, and these two kinds of blades are except that the height dimension L of blade root 2 molded line part 2.1 is different, all the other parts are identical. Fig. 1 and Fig. 2 are the structure of blade A, the height dimension La of the blade root profile part 2.1, Fig. 3 and Fig. 4 are the structure of B blade, the height dimension Lb of the blade root profile part 2.1, La>Lb. Correspondingly, the wheel groove on the impeller 10 is also two kinds, r...

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Abstract

The invention discloses an untuned short moving blade of a whole-stage steam turbine. A plurality of the short moving blades are assembled on an impeller to form the whole stage; each short blade is provided with a blade body, a blade root and a blade crown which have an integral structure; the blade root is provided with a molded line part and a midbody part; the stage blade is divided into two kinds; the molded line parts of the blade roots of two kinds of the blades have different heights; and two kinds of the blades are arranged at intervals on the impeller; clearance is reserved between the midbodies of the blade roots of two kinds of the blades; the blade crown is provided with a damping structure; and the blade root is an axial mounting type blade root. Through adjusting the relative difference of the inherent frequencies of two kinds of the blades, namely controlling the length difference of the dimensions L of the blade roots, the response and dynamic stress of the whole system are controlled within the safe range.

Description

technical field [0001] The invention relates to a whole-stage moving blade of a steam turbine, in particular to a short moving blade of a whole-stage steam turbine without frequency regulation. Background technique [0002] A steam turbine is an energy conversion device that converts thermal energy into mechanical energy. The steam turbine blade is the core component in the energy conversion process of the steam turbine, especially the design of the moving blade is very important to the safety of the steam turbine. [0003] In fact, most of the damage of moving blades is caused by excessive dynamic stress. In order to ensure the safe operation of the moving blades of the steam turbine, the dynamic stress of the moving blades must be controlled. It is generally required to avoid the natural frequency of the blades from the frequency range of the possible exciting force, that is, to adjust the resonance. Even as a damping blade, avoiding resonance can reduce the dynamic stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/16
Inventor 周振杰曹守洪吴其林江生科张东连牛久芳黄彪钟刚云李银凤贺伟
Owner DONGFANG TURBINE CO LTD
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