Ultra-thin plate type heater and manufacturing method thereof

Abstract

The invention relates to a ultrathin plate type heater for performing scene shrink on a hydraulic generator rotor yoke, namely heating and a preparation method thereof. The heater is provided with a rectangle thin plate type case, and two thin silicon wafers are arranged vertically on two sides near the case. Two thin heating elements are arranged in parallel and symmetrically at the two sides ofa vertical center line between two silicon wafers. In the preparation of the invention, the case is composed of an upper plate and a lower plate, and flanges are arranged around the upper plate. First, the upper plate, the lower plate, the thin silicon wafers, the heating elements are cut out one by one according to the set sizes, then the silicon wafer, the heating elements, the silicon wafer are laid in turn on the lower plate. An educe wire is joined from one end of the heating element, the upper cover is covered and the flanges are folded. Riveting holes arranged along a center line equispacedly rivet the upper plate and the lower plate relatively one by one. Total thickness of the heater, thicknesses of the case, the heating element, the silicon wafers are controlled according to certain range.

Description

technical field [0001] The invention relates to a heater and a manufacturing method thereof, in particular to an ultra-thin plate heater and a manufacturing method thereof which are used for on-site thermal sleeve heating of a rotor yoke of a hydroelectric generator. Background technique [0002] When the hydropower unit is in operation, the rotor yoke of the hydroelectric generator will generate a large centrifugal force, and the larger the diameter of the rotor or the higher the speed, the larger the separation gap will be, which will not only cause the unit to swing and vibrate , and even cause the hook on the rotor bracket column to break due to the impact, causing a major accident. Therefore, when the rotor is assembled, after the yoke is stacked, the method of keying the yoke must be adopted to pre-install the yoke and the rotor bracket. Apply a pre-tightening force to make the radial tightness between the yoke and the rotor support meet the requirements of the unit op...

AI Technical Summary

Problems solved by technology

Since the new rotor structure is completely different from the traditional rotor structure, and the yoke lamination method is unprecedented, the existing shrink-fit technology cannot be applied despite its drawbacks.

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