Method for simultaneously heating inner ring and outer ring of main bearing of megawatt wind turbine set

Abstract

The invention discloses a method for simultaneously heating an inner ring and an outer ring of a main bearing of a megawatt wind turbine set. The method includes the steps that novel induction heating and magnetic induction line heating technologies are adopted; an outer ring induction line of the main bearing is directly wound on the outer ring, and the outer ring is heated to swell through vortexes generated in the outer ring of the main bearing; an inner ring induction line of the main bearing is firstly wound on a tool, then the tool is installed in the inner ring of the main bearing, and the inner ring is heated to swell through vortexes generated in the inner ring of the main bearing; the magnetic induction winding line density of the outer ring is 1.5 times-2 times that of the inner ring, and therefore it is ensured that the swelling amount of the outer ring of the main bearing is always larger than that of the inner ring at the same moment; after installation, the inner ring and the outer ring of the main bearing are simultaneously heated and swell, the heating efficiency is high, and a main bearing roller is free of any risk.

Description

technical field [0001] The invention relates to a method for simultaneously heating the inner and outer rings of a main bearing of a megawatt wind turbine. Background technique [0002] The main bearing of a megawatt wind turbine is the core component of the wind turbine, and its inner hole and main shaft are designed as an interference fit. During the installation process, the main bearing is generally heated to make it expand, and then it can be installed after it can fit with the shaft clearance. Commonly used main bearing heating methods include oil heating, heating furnace heating and induction heating; among them, oil heating and heating furnace heating are complex in operation, slow in heating speed, and have high requirements on the site environment, and are suitable for heating small bearings in closed environments; and The size of the main bearing of the megawatt-class wind turbine is too large, and the general machine factory does not have a separate heating room...

AI Technical Summary

Problems solved by technology

Commonly used main bearing heating methods include oil heating, heating furnace heating and induction heating; among them, oil heating and heating furnace heating are complex in operation, slow in heating speed, and have high requirements on the site environment, and are suitable for heating small bearings in closed environments; and The size of the main bearing of the megawatt wind turbine is too large, and the general machine factory does not have a separate heating room, so the best way is to use an induction heater for induction heating

But at the same time, based on the induction principle of the induction heater, the temperature difference between the inner and outer rings of the main bearing will inevitably be too large when the main bearing with the inner and outer rings is heated. For example, the temperature difference between the inner and outer rings of the induction heater with a measured capacity of 100KVA can reach 100°C, this will cause the expansion of the inner ring of the main bearing to be greater than that of the outer ring, and the clearance of the main bearing will become a negative number, which will cause bad extrusion to the rollers of the main bearing and affect the overall use effect of the main bearing

Using induction heaters to adopt stepwise heating, although it can ensure that the characteristics of the main bearing will not be affected, but its speed is slow, the efficiency is low, and it is not suitable for mass production