Pitch bearing of wind turbine and protective sealing ring of pitch bearing

Abstract

A protective sealing ring of a pitch bearing of a wind turbine comprises a main sealing body, a boss, a plurality of oil sealing lips, a plurality of straight sealing lips and a dustproof lip. The protective sealing ring is high in pressure resistance and good in sealing effect, and can put an end to the leakage of lubrication grease inside the bearing. The protective sealing ring adopts the dustproof lip, the plurality of oil sealing lips and the plurality of straight sealing lips, thereby increasing the resistance to outward leakage of the lubrication grease inside the pitch bearing, settingup multiple protection, and effectively putting an end to the leakage of the lubrication grease. When the pitch bearing is in operation, the sealing structure of the protective sealing ring can causethe waste lubrication grease inside the bearing to be discharged from a bearing grease discharging hole, so that the normal operation of the pitch bearing can be ensured.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a pitch bearing of a wind power generating set and a protective sealing ring thereof. Background technique [0002] The pitch bearing is a key component of the pitch system of a wind turbine. It is installed at an altitude of 140 meters, and the working environment is relatively harsh, especially in stormy weather. The pitch bearing not only bears huge axial loads and radial loads , At the same time, it also bears a large overturning moment, so the product quality of the pitch bearing directly determines whether the wind turbine can operate normally. In order to ensure the reliability of the pitch bearing and prolong its service life, it is usually necessary to seal and lubricate the pitch bearing well. With the increase of the running time of the wind turbine, due to the gradual aging of the protective sealing ring of the pitch bearing, the gradual det...

AI Technical Summary

Problems solved by technology

[0004] There are two defects in the structure of the double-lip sealing ring: the first defect is that the sealing ring has only one oil sealing lip and dust-proof lip, and the sealing structure is too simple. When the pitch bearing does not completely rotate, the internal lubricating grease will The bearing moves outside, and then leaks outward from the gap between the oil seal lip and the outer ring of the pitch bearing

The outer dust lip cannot effectively protect the oil from leaking, resulting in the continuous leakage of the lubricating oil inside the pitch bearing to the outer space

With the long-term operation of the pitch bearing of the wind turbine, the internal lubricating grease of the pitch bearing will continue to leak, resulting in a serious lack of internal lubricating grease, which will affect the normal operation of the pitch bearing

The second defect is that the mounting handle structure of the sealing ring has no effective anti-extrusion design. Although there are two semicircular limit bosses on the upper and lower sides of the mounting handle, when the pitch bearing does not completely rotate, the internal lubricating grease will leak under pressure. Moving to the outside of the pitch bearing, the mounting handle will easily come out of the radial groove of the inner ring, which will cause the double-lip sealing ring to fall off from the slewing bearing, causing a large amount of lubricating grease inside the slewing bearing to leak, which will eventually affect the Proper operation of propeller bearings

[0005] In recent years, domestic wind turbine manufacturers and wind power bearing suppliers have lacked cooperation in solving the problem of grease leakage from pitch bearings. Although there are some research ideas and directions, the research is not deep enough and thorough enough to effectively solve or reduce the problem fundamentally. The problem of pitch bearing grease leakage, so it is necessary to innovate the structure of the current pitch bearing protective seal ring, to provide a new direction or systematic thinking for solving the problem of pitch bearing grease leakage

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