A high-speed roller cone bit bearing helical and reverse helical combined sealing structure

Abstract

The invention relates to a high-speed roller cone bit bearing spiral and reverse spiral combined sealing structure, which is composed of a cone, a bearing, a spiral sealing ring, a reverse spiral sealing ring and an O-shaped rubber ring. The spiral sealing ring is installed in the spiral groove of the cone. When the drill bit rotates at high speed, the mud particles are discharged out of the sealing chamber through the action of the spiral pumping, and at the same time, the pressure on the outside of the O-shaped rubber ring is increased, and the O-shaped rubber ring is reduced. The pressure difference on both sides improves the sealing effect of the O-shaped rubber ring; the reverse spiral seal ring is installed in the reverse spiral groove of the cone, and the grease is discharged into the bearing, effectively preventing the loss of grease; the O The type rubber ring is installed in the groove of the bearing, which realizes auxiliary double-stage sealing when the drill rotates at high speed, and plays a sealing role when the drill stops rotating. The invention has good sand discharge performance and lubricating performance, greatly reduces bearing wear, can simultaneously meet the requirements of high-speed rotating and static sealing of the drill bit, and improves the reliability and stability of the sealing.

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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