Gap-type heating device and heating method for upper guide-slip rotor of large-scale hydroelectric generating set

Abstract

Provided is a gap-type heating device for an upper guide bearing collar of a large hydroelectric generating set. The upper guide bearing collar is of a detachable structure. A heating assembly is composed of three segments of heating units which are separated by detachable gap adjustment sheets. The gap between the heating device and the upper guide bearing collar is designed to be 9-12mm, heat is transferred through heat radiation, and the surface of the guide bearing collar is effectively prevented from being burnt in the heating process. The whole heating device is closed, and the heating sheets are isolated from the outside, so that the heating sheets are prevented from scalding people. The insulation and grounding of the heating device are in line with the requirements. Thus, on-site unsafe factors are effectively reduced.

Description

technical field [0001] The invention relates to a gap-type heating device for an upper guide-sliding rotor of a large-scale hydraulic generator set and a heating method for the device. A three-lobed heating component is used to adjust and control the temperature. Background technique [0002] At present, the upper guide-slip rotor and the upper end shaft of large-scale hydro-generator sets are mostly installed by shrink fit. When disassembling and installing the upper guide-slip rotor (such as replacing the excitation lead wire at the upper end shaft), the upper guide-slip rotor needs to be heated. There is no consensus in the industry on how to quickly and easily disassemble and install without damaging the surface of the upper guide rotor. However, the usual practice in large hydropower stations is to directly lay several heating plates on the surface of the upper guide-slip rotor, and cover them with asbestos cloth for heat preservation. When it is heated to a certain te...

AI Technical Summary

Problems solved by technology

[0003] Although this method can realize the disassembly and installation of the upper guide sliding rotor, it has the following disadvantages: (1) Since the temperature of the heating plate is too high, it is directly attached to the surface of the sliding rotor, which is easy to burn the surface and cause material changes

(2) Direct heating of the sliding rotor with a heating plate is easy to cause deformation, and its size cannot be restored on site

(3) The wiring is cumbersome and the temperature is not easy to control

In the process of heating the sliding rotor, each heating piece needs to be wired, and the work is cumbersome; when a certain heating piece is not in good contact, if it is not found in time, most of the temperature has risen, and the temperature of some parts is still low. In the case of uneven temperature, it is easy to cause deformation; and in the heating process, when the temperature is uneven, the temperature control cannot be realized.

(4) Due to the high temperature of the heating plate, if the staff accidentally touches it, it will cause burns

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