Evaporatively cooled metal shields for turbogenerator ends

Abstract

The invention provides an evaporative cooling type metallic shield for an end portion of a turbonator. The evaporative cooling type metallic shield comprises an inner-layer shield board and an outer-layer shield board, wherein an inner cavity used for containing cooling liquid is formed between the inner-layer shield board and the outer-layer shield board. An inner wall and an outer wall are arranged on the two sides of the inner cavity, and a partition board is arranged in the cavity in the horizontal direction of the section. The partition board divides the inner cavity into an upper half-circumference cavity and a lower half-circumference cavity. A baffle is arranged in the upper half-circumference cavity in the lengthwise direction of the section, and the baffle divides the upper half-circumference cavity into an upper left cavity and an upper right cavity. A self-cooling manner is adopted in the metallic shield, the structure is simple, auxiliary device does not exist, and application and achieving of cooling of the metallic shield are facilitated.

Description

technical field [0001] The invention belongs to the field of electrical engineering, and in particular relates to an evaporative cooling metal shield for the end of a steam turbine generator. Background technique [0002] In the field of electrical engineering, the magnetic field leakage at the end of the generator is a common potential safety hazard. The magnetic flux leakage will induce eddy currents in the metal structural parts at the end of the generator, causing heating of the end components. In particular, the concentrated magnetic flux leakage at the end can easily lead to local overheating of structural parts, and may even endanger the safe operation of the generator in severe cases. [0003] The metal shield installed outside the pressure ring at the end of the generator is used as a component to resist the magnetic flux leakage at the end, which can effectively prevent local overheating of the structural parts. Since the metal shield at the end of the generator i...

AI Technical Summary

Problems solved by technology

Since the metal shield at the end of the generator is thinner and smaller in size, the loss per unit volume is much greater than that of other structural parts due to the large eddy current leakage at the end, which will cause the temperature rise of the metal shield at the end of the generator Too high, the metal shield generates serious heat. The existing metal shield is a solid structure, which cannot be self-cooled inside. The existing metal shield is close to the external cooling, which makes the cooling of the metal shield insufficient. The cooling effect of the metal shield is not ideal, especially for large capacity The cooling effect of the metal shield is poor, and the problem of magnetic flux leakage at the end cannot be effectively solved, which also affects the service life of the metal shield.

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