Spiral and reverse spiral combined sealing structure of high-speed roller bit bearing

Abstract

The invention relates to a spiral and reverse spiral combined sealing structure of a high-speed roller bit bearing. The spiral and reverse spiral combined sealing structure is composed of a roller, a bearing, a spiral sealing ring, a reverse spiral sealing ring and an O-shaped rubber ring, wherein the spiral sealing ring is arranged in a spiral groove of the roller; when the bit rotates at high speed, sludge particles are discharged out of a sealing cavity under the pumping action of a spiral pump, meanwhile, the pressure at the outer side of the O-shaped rubber ring is increased, the pressure difference at two sides of the O-shaped rubber ring is reduced, and the sealing effect of the O-shaped rubber ring is improved; the reverse spiral sealing ring is arranged in a reverse spiral groove of the roller, and lubricating grease is discharged into the bearing, so that the lubricating grease is effectively prevented from being lost; and the O-shaped rubber ring is arranged in a groove of the bearing so as to achieve the auxiliary double-stage sealing effect during high-speed rotation of the bit and take a sealing effect when the bit stops rotating. The spiral and reverse spiral combined sealing structure has relatively good sand discharging and lubricating performances, the bearing wear is greatly reduced, the requirement for sealing when the bit rotates at high speed and stops can be simultaneously met, and the sealing reliability and stability are improved.

Description

technical field [0001] The invention relates to a high-speed roller bit bearing helical and reverse helical combined seal suitable for oil drilling and geological drilling, belonging to the field of roller bit bearing sealing. Background technique [0002] One of the key factors affecting the service life of high-speed roller cone bits is the quality of bearing sealing performance. In high-speed drilling, because the roller cone bit is under heavy load and vibration when working at the bottom of the well, the space of the bit bearing and sealing system is very small, and the surrounding is abrasive and corrosive drilling fluid, and the friction and wear of the bearing and sealing elements are aggravated. Lubricating oil leakage is serious, and the life of the sealing performance is extremely short, which leads to the early failure of the bearing system and the drill bit. [0003] The most critical factors affecting high-speed roller cone bits are the entry of mud abrasive m...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor sand discharge performance and serious grease leakage existing in the existing high-speed roller cone bit bearing sealing structure, and to provide a high-speed roller cone bit bearing helical and reverse spiral combined sealing structure

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