Generator rotor slot wedge manufactured by beryllium-nickel-titanium-copper alloy

Abstract

A kind of rotor slot wedge of dynamotor made of Be-Ni-Ti-Cu alloy, the character of it is: the weight percent of the main components are Be 0.10-0.30%, Ni 1.50-2.50%, Ti 0.40-0.60%, Cr 05-0.15%; the weight percent of impure elements: Mn<=0.04%, Pb<=0.01%, Zn<=0.50%, Fe<=0.20%, Sn<=0.20%, Al<=0.04%, Bi<=0.005%, Mg<=0.005%, the rotor slot wedge of dynamotor is made out by smelting, cast, hot forging, cold-forming, heat treatment, and machining technology. The advantage of this patent is that it owns great mechanical property both at normal temperature and high temperature, and great electric ability, the cost of it is low, and it is easy to confect, and the internal soundness is well, and the percent of pass at supersonic flaw detecting is high.

Description

technical field [0001] The invention relates to a generator rotor slot wedge made of beryllium-nickel-titanium-copper alloy, which can be used at the rotor end of a steam turbine generator and belongs to the technical field of generator rotor slot wedges. Background technique [0002] When the turbogenerator is running, the rotor slot wedges have to bear the huge centrifugal force of the copper wires, insulating parts and itself in the slot when the rotor is running, especially when the rotor is running under abnormal conditions such as negative sequence, the large negative sequence current will produce higher temperatures. Therefore, it is required that the alloy material used as the slot wedge at the end of the rotor and as the slot wedge for negative sequence current damping must have high electrical conductivity and high strength and toughness at room temperature and high temperature. [0003] See Table 1 for the mechanical properties and electrical conductivity require...

AI Technical Summary

Problems solved by technology

[0006] Although the mechanical properties and electrical conductivity can meet the design requirements, the beryllium-cobalt-zirconium-copper alloy contains relatively high elements such as Co and Be, and these metal elements are radioactive, which increases the production cost of the material.

At the same time, the higher Be content will bring certain harm to the environment and human body in the process of manufacturing and processing.

Moreover, the slot wedge made of beryllium-cobalt-zirconium-copper alloy material has a low pass rate of flaw detection after forming, about 70%.

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