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Mixed-flow water turbine L-shaped blade reel

A hydraulic turbine and Francis flow technology, which is applied in the improvement field of each unit blade, can solve problems such as less than ideal indicators, problems of hydraulic turbine stability, and weakening of the rigidity of the runner.

Active Publication Date: 2006-09-13
HARBIN ELECTRIC MASCH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After long-term technological development, the Francis turbine has been basically finalized, but a slight improvement of the blade airfoil of the runner may have a greater impact on the efficiency of the turbine. Seeking a more reasonable airfoil structure is still the designer's constant pursuit of goals, and as the turbine With the increase of the specific speed and the increase of the amplitude of the water head, the qualitative problem of the stability of the turbine operation has become increasingly prominent. In the past 30 years, some large-scale units at home and abroad have experienced vibration problems of varying degrees in a considerable number of turbines. The stability of the turbine operation is one world problem
With the continuous increase of the unit capacity of the hydro-generator set, the size of the hydro-turbine increases accordingly, and the rigidity of the runner is relatively weakened. Chinese patent ZL97195388.0 proposes an improved impeller of the Francis-type hydro-turbine. Its cavitation and water flow characteristics has been improved, but the above-mentioned indicators are still not ideal

Method used

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  • Mixed-flow water turbine L-shaped blade reel
  • Mixed-flow water turbine L-shaped blade reel
  • Mixed-flow water turbine L-shaped blade reel

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Embodiment Construction

[0019] After long-term development, the Francis turbine has basically been finalized. The runner structure mainly includes: the upper crown, the lower ring and some curved blades connected between the upper crown and the lower ring, such as figure 1 shown. The high-pressure side of the runner, that is, the radial inflow side of the water flow is the water inlet edge of the blade, and the low-pressure side of the runner, that is, the axial outflow side of the water flow is the water outlet edge of the blade. Such as image 3 As shown, the connection point between the outlet edge of the Francis turbine blade and the lower ring is A, the midpoint of the outlet edge shape line is M, and G is any point between A and M on the water outlet edge shape line. The characteristic is that: for the points between the outlet edge lines A and M, the total existence point G is located above the straight line AM along the rotation direction n, that is, the straight line AM is not completely in...

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Abstract

The present invention discloses a L-type blade rotor of mixed-flow hydraulic turbine. The component related by said invention is water-outgoing edge of the blade, and said invention can utilize the change of geometric form and size of water-outgoing edge of blade to attain the goal of improving hydraulic performance of the hydraulic turbine. Said invention includes an upper crown component, a lower ring component and several curved blades connected between the upper crown component and lower ring component. Besides ,said invention also provides the connection mode of the above-mentioned all the components.

Description

Technical field: [0001] The present invention relates to a runner of a water turbine, in particular to the improvement of each unit blade in the runner. technical background: [0002] After long-term technological development, the Francis turbine has been basically finalized, but a slight improvement of the blade airfoil of the runner may have a greater impact on the efficiency of the turbine. Seeking a more reasonable airfoil structure is still the designer's constant pursuit of goals, and as the turbine With the increase of the specific speed and the increase of the amplitude of the water head, the qualitative problem of the stability of the turbine operation has become increasingly prominent. In the past 30 years, some large-scale units at home and abroad have experienced vibration problems of varying degrees in a considerable number of turbines. The stability of the turbine operation is A world problem. With the continuous increase of the unit capacity of the hydro-gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B3/02F03B3/12
CPCY02E10/223Y02E10/20
Inventor 覃大清纪兴英
Owner HARBIN ELECTRIC MASCH CO LTD