Split piano type shielding device on end part of steam-turbine generator

Abstract

The invention discloses a split piano type shielding device on the end part of a steam-turbine generator, which relates to a metal shielding device and aims to solve the problems that a metal shielding structure on the end part of the existing large steam-turbine generator has the disadvantages of high eddy current loss and poor heat dissipation effect and the self temperature cannot be effectively reduced. The split piano type shielding device comprises a ring wind screen, a pressure ring, a pressure finger and at least two shielding plates, wherein the pressure ring is pressed on the pressure finger and positioned on the end part of the steam-turbine generator; each shielding plate is a three-stage bending plate and in a piano type structure; the at least two shielding plates which are circumferentially arranged form a shielding body; the first stage of each shielding plate is adjacent to the ring wind screen; the shielding body is in a ring shape; the ring wind screen and the shielding body are coaxially arranged; the shielding body is positioned between the ring wind screen and the pressure ring, and the shielding body, the ring wind screen and the pressure ring are connected in a detachable mode; and same gaps are left between every two adjacent shielding plates. The split piano type shielding device is used for reducing the self temperature of the steam-turbine generator.

Description

technical field [0001] The invention relates to a metal shielding device, in particular to a clasp-key type metal shielding device at the end of a steam turbine generator, which belongs to the field of large synchronous generators. Background technique [0002] For a large turbogenerator, due to its long axial length, the protruding length of the end windings at both ends accounts for about 1 / 4 to 1 / 3 of the total axial length, so the rational design of the end structure is very important. With the increase of the unit capacity of the generator, the electromagnetic load of the generator increases, and the magnetic flux leakage at the end increases sharply. The metal shield of the generator is the only component that protects the end pressure ring, pressure finger and other structures and directly resists the magnetic flux leakage at the end. The eddy current generated by itself is large and the temperature rises. [0003] The traditional metal shield at the end of the turbo...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the metal shielding structure at the end of the large turbogenerator has large eddy current loss, poor heat dissipation effect, and cannot effectively reduce its own temperature, and further provides a split lobe at the end of the turbogenerator Piano shielding device

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