Water turbine wear-resistant casting and welding structure guide vane and manufacturing method thereof

Abstract

The invention relates to a wear-resisting water turbine guide vane of a cast-weld structure and a manufacturing method thereof. The wear-resisting water turbine guide vane is used for controlling annular water flow and annular water static pressure energy of water which flows inside a water turbine volute at a high speed to water turbine runner blades from the periphery of a water turbine runner. The wear-resisting water turbine guide vane of the cast-weld structure comprises a guide vane body and a guide vane shaft, and is characterized in that the guide vane body is composed of a cast carbon steel guide vane main body, an upper stainless steel end plate, a lower stainless steel end plate and a tail stainless steel plate; the cast carbon steel guide vane main body is provided with an upper main body end face, a lower main body end face, a main body tail side face and a main body head side face; an upper main body end face welding angle is formed at the periphery of the upper main body end face in a chamfering mode; a lower main body end face welding angle is formed at the periphery of the lower main body end face in a chamfering mode; main body tail side face welding angles are formed at two side edges of the main body tail side face in a chamfering mode; and a main body head side face welding padding groove is formed in the main body head side face. The lower stainless steel end plate and the lower main body end face are compounded. The wear-resisting water turbine guide vane has the advantages that the wear-resistance cost performance is high, the hot melting amount in welding is small, the guide vane shaft is prevented from deforming, and the economic cost is effectively lowered.

Description

Technical field [0001] The invention relates to a wear-resistant cast-welded structure guide vane of a hydraulic turbine and a manufacturing method thereof, and is applied to control the annular water flow and the annular hydrostatic energy of the high-speed water flowing inside the turbine volute from the turbine runner to the turbine runner blade. Background technique [0002] Turbine guide vanes are the key part of the water-guide mechanism of the water turbine; the water-turbine guide vanes are arrayed around the turbine runner in an annular distribution to control the total water flow to the turbine runner blades on the one hand, and on the other hand form The annular impulse converts the kinetic energy of the fluid in the volute into static pressure energy flowing to the runner blades. The water guide mechanism of the water turbine also realizes the shutdown function of the water turbine in an emergency state through the guide vanes. [0003] When the water turbine is runnin...

AI Technical Summary

Problems solved by technology

The cost of ordinary sand cast steel is low, and the guide vanes of steel castings often have defects such as sand inclusions, pores, and looseness, while the guide vanes are precision-machined parts, with many processing procedures and long cycles. The amount of stress and deformation is often greater than the machining allowance left during finishing, which causes the workpiece to be scrapped because it cannot be repaired.

Cast stainless steel guide vanes are mostly made of refined casting, which has high wear resistance, but the casting process is complicated, the material is precious metal, and the manufacturing cost is high

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