Turbine-generator rotor adopting sub-slot air supplying and transverse wind gap cooling mode

Abstract

The invention discloses a turbine-generator rotor adopting a sub-slot air supplying and transverse wind gap cooling mode, and belongs to the field of the generator rotor. Side edge radial air channels connected with slot wedge ventilating holes and a sub slot are formed in the two sides of a coil in a rotor wire slot respectively; transverse wind gaps, which are densely distributed in a radial direction in the coil, are connected with the side edge radial air channels in the two sides; the air flowing directions of the transverse wind gaps of adjacent pitches are opposite, and are perpendicular to the air flowing direction of the sub slot; axial air channels are formed in the straight line sections of an end part coil below each protective ring; end part slot wedge wind holes connected with the axial air channels and air gaps are formed in end part slot wedges; transverse air channels are formed in the arc sections of the end part coil; and wind blowing slots connected with the transverse air channels and the air gaps are formed in a big tooth end part. By adoption of the turbine-generator rotor with a novel ventilating structure, the problem existing in cooling of the full-speed turbine-generator rotor with single-machine power of 1,200MW or above can be solved.

Description

technical field [0001] The invention belongs to the field of generator rotors, and relates to a turbogenerator rotor with a novel ventilation structure, in particular to a full-speed turbogenerator with a single-stage fan pressure head with a unit power of more than 1200MW. Background technique [0002] Early turbogenerator rotors used external cooling. The heat generated by the coil was transferred to the outer surface of the rotor through heat conduction, and then transferred out through the convective heat dissipation of the cooling gas in the air gap. Due to the large heat transfer temperature difference of the externally cooled rotor, the single unit power of the generator can only reach 100MW; in order to meet the demand for continuous growth of unit capacity, the internally cooled rotors in the world that take air from the air gap and supply air from the auxiliary tank are currently being used. It is widely used in large-capacity turbogenerator products. in: [0003...

AI Technical Summary

Problems solved by technology

The fan design and installation of this kind of generator are complicated, and the ventilation loss is much higher than that of other models. The rotor only has a small auxiliary groove near the end face for the cooling gas to enter the air inlet of the axial wind hole of the coil.

Images