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Bearing spiral combined sealing structure of high-speed roller bit

A roller cone bit and combined sealing technology, which is applied in construction and other directions, can solve problems such as wear, poor sand discharge performance, and low reliability, and achieve the effects of saving space, improving sealing performance, and high reliability

Active Publication Date: 2015-12-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor sand discharge performance, serious wear and low reliability in the existing high-speed roller cone bit bearing sealing structure, and to provide a high-speed roller cone bit bearing spiral combination seal

Method used

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  • Bearing spiral combined sealing structure of high-speed roller bit
  • Bearing spiral combined sealing structure of high-speed roller bit

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with drawings and embodiments.

[0012] like figure 1 As shown, a high-speed roller cone bit bearing spiral combined sealing structure is composed of a roller cone (2), a bearing (5), a spiral sealing ring (6) and an O-shaped rubber ring (7). The spiral combined sealing structure is installed in the sealing cavity between the bearing (5) and the cone (2).

[0013] like figure 2 As shown, the inner hole of the cone (2) is processed with a spiral groove for installing the spiral sealing ring (6); the O-shaped rubber ring (7) is installed in the groove of the bearing (5) through interference fit , so that it is tightly hooped on the bearing and located on the top of the spiral sealing ring (6).

[0014] With reference figure 1 , when this seal is applied in the field, the tooth claw (1) and the cone (2) are respectively socketed on the bearing (5) through the inner hole of the cone, and the steel bal...

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Abstract

The invention relates to a bearing spiral combined sealing structure of a high-speed roller bit. The bearing spiral combined sealing structure comprises a roller cone, a bearing, a spiral seal ring and an O-shaped rubber ring. The spiral seal ring is installed in a spiral groove of a roller cone inner hole. When the bit rotates at a high speed, through the pumping effect of the spiral groove, a function of automatically draining sand is achieved. The pressure of the outer side of the O-shaped rubber ring is added, the pressure difference of the two sides of the O-shaped rubber ring is reduced, and the sealing effect of the O-shaped rubber ring is improved. The O-shaped rubber ring is located above the spiral seal ring and installed in a bearing groove with a certain interference. When the bit rotates at a high speed, the auxiliary two-stage sealing is achieved, and the bit can also achieve the effective sealing effect when stopping rotating. The bearing spiral combined sealing structure has good sand draining performance, the abrasion to the bearing can be effectively reduced, the sealing requirements under different working conditions can be met, the sealing reliability and stability are greatly improved, the sealing service life is prolonged. Other supporting elements are not needed for the sealing, and precious time is saved for the roller bit.

Description

technical field [0001] The invention relates to a high-speed roller cone bit bearing spiral combination seal suitable for oil drilling and geological drilling, and belongs to the field of roller cone bit bearing seals. Background technique [0002] High speed is a new direction for the development of roller cone bits, and the research on long-life high-speed roller cone bits has become a major technical issue that urgently needs to be solved in the world's oil drilling projects. The bearing seal is the key to determine the life of the high-speed roller cone bit, and it is the weakest link of the high-speed roller cone bit. The failure analysis of the roller cone bit shows that as long as one roller cone bearing in the roller cone bit is damaged in advance, the whole bit will fail quickly. Statistical analysis of on-site data shows that the drill bits that fail due to early bearing damage account for 80% of the total number of failed drill bits, and the life of the bearing d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/25
Inventor 周已王林黄志强伍开松张富晓汤海平张浩辰唐宇杰
Owner SOUTHWEST PETROLEUM UNIV
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