Low wind speed large-sized double-fed half direct-drive main bearing mechanism

Abstract

The invention discloses a low wind speed large-sized double-fed half direct-drive main bearing mechanism. The low wind speed large-sized double-fed half direct-drive main bearing mechanism comprises afloating bearing and a thrust bearing, wherein the thrust bearing adopts a thrust self-aligning roller bearing; the floating bearing and the thrust bearing share one bearing block; a spigot ring is arranged on the inner side of the bearing block; the floating bearing and the thrust bearing are respectively arranged on two sides of the spigot ring; a gap is reserved between the spigot ring and theouter side of a main shaft; inner rings of the floating bearing and the thrust bearing are both in interference fit with the main shaft; outer rings of the floating bearing and the thrust bearing areboth in interference fit with the inner side of the bearing block; in addition, a gap between the floating bearing and the bearing block is smaller than that between the thrust bearing and the bearing block. According to the low wind speed large-sized double-fed half direct-drive main bearing mechanism disclosed by the invention, by adopting the thrust self-aligning roller bearing as the thrust bearing, all axial loads transmitted by an impeller can be borne and the problem that the main shaft is easy to deform can be solved. By adopting a bearing combined structure, the coaxiality of the twobearings is ensured; in addition, inner cavities of the two bearings are enabled to be communicated, so that convenience in maintenance is realized, the reliability of a main bearing and a wind generation set is improved, and the service life of the main bearing mechanism is prolonged.

Description

technical field [0001] The invention relates to the technical field of wind turbine main bearings, in particular to a large-scale double-fed semi-direct drive main bearing mechanism with low wind speed. Background technique [0002] The main shaft bearing is one of the core components of the wind turbine. It has special operating conditions and harsh application environment. Once it fails, it will cause high component costs and replacement costs, and affect the power generation. [0003] The main bearings of existing wind turbines generally use double-row spherical roller bearings. The main reason is that this type of bearing has the following advantages: 1) Strong radial load capacity; 2) It can compensate for the assembly error of the two bearing seats and the deflection of the main shaft without Increase the bearing burden; 3) It can compensate the thermal expansion of the main bearing during the working process; 4) Simple assembly and disassembly; 5) Low cost of bearing ...

AI Technical Summary

Problems solved by technology

In the two-point support structure, the spherical roller bearing 3 on the impeller side is a floating bearing, which mainly bears the radial load on the impeller side, and the other double-row spherical roller bearing 3' is a thrust bearing, which is used to bear part of the radial load and at the same time , it also needs to bear a large axial load, similar to the three-point support structure, the thrust bearing is prone to single-row load, which will lead to early failure

[0006] Based on the above analysis, it can be seen that the axial load-bearing capacity of the main bearing in the existing structure is insufficient, and the axial load-bearing capacity of the bearing is very high, and the axial load-bearing capacity cannot be enlarged in one direction due to space and price constraints. In order to solve the above problems, this application A new low-wind-speed large double-fed semi-direct drive main bearing mechanism is proposed, which is suitable for both large double-fed wind turbines and large semi-direct drive units, and can well bear the axial load and radial load, improving the reliability of main bearings and wind turbines

Images