Electromagnetic internal heating type hot cover process for water-wheel generator rotor support

A hydro-generator and rotor support technology, which is applied in the manufacture of motor generators, induction heating, and stator/rotor bodies, etc., can solve the problems of slow heating speed of electric hot plates, large workload of heat preservation shed, and hub clearance, etc. The effect of reducing labor intensity, reducing floor space and uniform heating

Inactive Publication Date: 2008-10-22
HARBIN ELECTRIC MASCH CO LTD
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AI Technical Summary

Problems solved by technology

[0002] The hydro-generator rotor bracket is generally composed of two parts: the hub and the bracket. The large shaft of the water turbine and the hub form an interference fit by means of shrink fit. The traditional method of shrink fit of the rotor bracket of a large hydraulic turbine generally uses refractory bricks to build an insulation shed. The electric heating plate heating method heats the entire rotor support, and heats the heat-shrink after heating to the temperature. The disadvantage of this method is that the workload of building the insulation shed is large, and the insulation shed built with insulation materials needs to be removed after the heat-shrinking. slow, energy-intensive
And after the heat sleeve is cooled, there is often a gap between the lower end of the hub and the shaft spigot

Method used

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  • Electromagnetic internal heating type hot cover process for water-wheel generator rotor support
  • Electromagnetic internal heating type hot cover process for water-wheel generator rotor support
  • Electromagnetic internal heating type hot cover process for water-wheel generator rotor support

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Embodiment Construction

[0033] The present invention is an electromagnetic internal heating heat-shrinking process for a rotor bracket of a hydraulic generator, such as figure 1 The magnet wire shown is wound on the bracket made of laminated epoxy glass cloth, and the bracket wrapped with the magnet wire is inserted into the wheel hub. The magnet wire is covered with insulating cloth for intermediate frequency induction heating. The heating equipment is KGPS100 static intermediate frequency power supply. The heating frequency is 8000Hz:

[0034] (1) Calculate the shrink-fit gap according to the maximum interference: the weight of the rotor bracket is relatively large, so it needs to be hoisted by a crane, and the actual centering time is relatively long. Therefore, the value of the shrink-fit gap δ0 should be considered to avoid stuck shafts. The empirical values ​​are:

[0035] When L>3d, δ 0 = d 900 ~ ...

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Abstract

The invention relates to a method for internally-heating shrinkage fit by electromagnetic induction to a rotor field spider and a shaft of a hydraulic generator. The method has the advantages of even heating, convenient control, movable heating equipment, repeated use, energy conservation and high efficiency. The method comprises the following steps of: winding an electromagnetic wire on a support made of a special temperature resistant material; then, inserting the support into a wheel boss of the rotor field spider to perform electromagnetic induction heating; sleeving the rotor field spider on the shaft after the wheel boss reaches predetermined magnitude of interference; and fixing the rotor field spider on a platform through a lacing wire to prevent the lower end of the wheel boss from moving upwards during cooling process.

Description

Technical field: [0001] The invention relates to an electromagnetic internal heating heat sleeve process for a hydroelectric generator rotor bracket. Background technique: [0002] The hydro-generator rotor bracket is generally composed of two parts: the hub and the bracket. The large shaft of the water turbine and the hub form an interference fit by means of shrink fit. The traditional method of shrink fit of the rotor bracket of a large hydraulic turbine generally uses refractory bricks to build an insulation shed. The electric heating plate heating method heats the entire rotor support, and heats the heat-shrink after heating to the temperature. The disadvantage of this method is that the workload of building the insulation shed is large, and the insulation shed built with insulation materials needs to be removed after the heat-shrinking. Slow and consumes a lot of energy. And after the heat sleeve is cooled, there is often a gap between the lower end of the hub and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K15/00H02K15/02H05B6/02H05B6/38
Inventor 史文卿李滨呼义通徐波王文彪
Owner HARBIN ELECTRIC MASCH CO LTD
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