Air-cooling fan capable of avoiding torsional vibration

Abstract

The invention discloses an air-cooling fan capable of avoiding torsional vibration. The fan comprises a motor, a speed reducer, half couplings and a permanent magnet transmission apparatus. The permanent magnet transmission apparatus comprises a conductor rotor and a permanent magnet rotor. The conductor rotor is fixed to an output shaft of the motor through one half coupling. The permanent magnet rotor is fixed to an input shaft of the speed reducer through another half coupling. The conductor rotor and the permanent magnet rotor are close to each other and there is an air gap between the conductor rotor and the permanent magnet rotor. When the output shaft of the motor is rotated, the conductor rotor is driven to rotate and cut a magnetic field generated by the permanent magnet rotor so as to generate a torque. The torque is used to drive the input shaft of the speed reducer to rotate. By using the scheme of the invention, generation of a torsional vibration phenomenon can be avoided.

Description

technical field [0001] The invention relates to air-cooling island technology, in particular to an air-cooling fan which avoids torsional vibration. Background technique [0002] The air-cooled island is the core component of the direct air-cooled turbogenerator set. It is a new technology introduced from abroad in 2008. It has been widely used in domestic 300MW, 600MW and 1000MW turbogenerator sets. [0003] This technology uses air as the cooling medium instead of traditional circulating water and cooling towers, thereby reducing the vaporization loss of circulating water and saving a lot of water resources, especially in the northwest region where water resources are relatively scarce. [0004] The air-cooled island usually adopts a high-level arrangement, and dozens of air-cooled fans provide cooling air to condense the exhaust steam sent to the air-cooled condenser through the exhaust pipe into water, and the condensed water is sent back to the steam turbine through the...

AI Technical Summary

Problems solved by technology

[0006] At present, the motor and the reducer are usually connected by a flexible coupling. Specifically, the output shaft of the motor and the input shaft of the reducer are connected by a flexible coupling. In this way, when the output shaft of the motor and the reducer When the vibration is not synchronized between the input shafts, it will cause shock vibration at the contact joint of the two shafts, resulting in torsional vibration, which may lead to fatigue damage of the shaft, etc., affecting the safe and reliable operation of the air-cooled fan

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