Causes of pin burning caused by elastic sleeve pin coupling

Published: 2020-01-04

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In recent years, the single-unit capacity of small horizontal hydro-generator units has been increasing.Elastic sleeve pin originally used for 500 kWCouplingIt has been unable to meet the requirements of increasing the single unit capacity of horizontal hydro-generator sets, and adopts elastic pin which can transmit torque than elastic sleeve pin coupling.Coupling.At present, this kind of coupling is widely used in small hydro-generator units. However, as the capacity and speed of the unit increase, due toElastic pin couplingThe problem of generator shaft bush burning caused by the connection of the generator has also been exacerbated.The connection of this coupling seriously affects the operation of the hydropower station.Many power station units are turned off, shut down, and burnt tiles, causing huge economic losses to the power station.In this paper, the connection of the elastic pin coupling is analyzed and researched in detail, and the corresponding technical transformation is carried out for the existing problems.

Most small horizontal hydro-generator sets use elastic sleeve pinsCouplingConnection, usually used for small units with 500 kW and rated speed of 750 r/min and below.The generator adopts rolling bearings, and the axial force of the generator should be borne by the rolling bearings. "When the single generator capacity increases, the original elastic sleeve pinCouplingCan not meet the resistance torque caused by the increase of generator capacity, so the elastic pin coupling is used for connection.Rolling bearings cannot withstand the increase in generator load, but sliding bearings are used.Since the sliding bearing can only bear radial force, plus the coupling adopts elastic pinCouplingconnection. "During the operation of the unit (especially when the unit is turned on and off), the generator rotor is affected by electromagnetic force and other unbalanced axial forces, causing the generator to move axially, causing side collisions and friction of the generator bearings, causing power generation The bearing of the machine burns.

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