Speed-increasing gearbox of wind driven generator

Abstract

The invention relates to the improvement of a speed-increasing gearbox of a wind driven generator, which is characterized in that: a gear transmission has 3 to 4 stages, wherein the last stage is a planetary gear transmission; the former stages are all double-circular-arc cylinder herringbone spiral gear transmissions. Compared with the conventional generally-used speed-increasing gearbox which mainly uses the planetary gear transmission, because the low-speed stages (1 to 3 stages) adopt double-circular-arc cylinder herringbone spiral gears with high transmission efficiency and a subsequent stage adopts the planetary gear transmission, the advantages of the double-circular-arc cylinder herringbone spiral gear transmission and the planetary gear transmission are combined together, thus the effective one-off life is long, the transmission efficiency is high and the volume is small; and moreover, the double-circular-arc cylinder herringbone spiral gear is used for the speed-increasing gearbox of the wind driven generator for the first time.

Description

technical field [0001] The invention relates to the improvement of the speed-up gearbox of the wind power generator, in particular to a speed-up gearbox of the wind power generator with long effective life, higher transmission efficiency, small volume and light weight. Background technique [0002] The wind turbine speed-up gearbox is mainly to transmit the low-speed high-torque generated by the blades to the generator through the gear speed-up, and reduce the volume of the generator by increasing the speed of the generator. The speed-increasing gearbox for wind power generation is installed in the air at 60-90 meters, and it is required to run continuously for a long time. It requires a long life and matches the overall life of the wind turbine as much as possible; secondly, the transmission efficiency should be high to reduce useful power loss and reduce The calorific value reduces the requirements of the cooling system, so that the temperature rise of the lubricating oil ...

AI Technical Summary

Problems solved by technology

[0004] However, the planetary gear-based speed-up transmission still has shortcomings. For example, the design life of wind power generation is required to be 20-25 years, while the planetary gear transmission, due to the wear and tear of the gears, the life of the planetary gearbox is only about 12 years. Investigations using planetary gearboxes have also been demonstrated, which necessitated the replacement of a gearbox over the lifetime of the wind turbine

The gearbox for high-power megawatt wind turbines weighs about 20 tons. It is not easy and troublesome to replace the gearbox in the air as high as 60-90 meters

Secondly, the transmission efficiency is still not the highest. The efficiency of the first-stage planetary gear is 0.97-0.99, calculated according to the average value of 0.98. If the three-stage planetary gear transmission is used, the total efficiency is only 0.98 3 = 0.9412, that is, about 6% of the energy is lost in the form of heat generated during gear transmission. Taking 2000 kW as an example, about 120 kW is converted into heat, which increases the temperature rise of the lubricating oil in the gearbox

With such a large amount of heat, natural cooling obviously cannot meet the cooling requirements, and an additional cooling system, such as forced air cooling or water-cooled heat exchange, has to be added, which not only increases the manufacturing cost, but also reduces the overall reliability of the gearbox

Furthermore, the existing planetary gear transmissions are basically single-connected transmissions, and the first and second stages have low speed and high torque, which requires a large modulus of the gears, which also results in a relatively large volume and weight of the speed-up gearbox.

Therefore, the effective life of the existing megawatt-level wind power generator speed-up gearbox does not match the wind power generation equipment, and it is difficult to maintain and replace; the efficiency is low (generally no more than 0.95), and the temperature rise of the lubricating oil is large, and additional cooling measures are required. ;Large volume and weight, difficult installation, is the main problem at present

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