Bearing sealing structure for rotary drill bit
A technology of roller cone bit and bearing sealing, applied in the field of bearing sealing, can solve the problems of large wear of sealing friction pair, affecting the reliability of sealing, affecting the performance of rubber parts, etc., achieving good sealing force, improving reliability, and improving temperature resistance. Effect
Active Publication Date: 2011-05-11
KINGDREAM PLC CO +1
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Problems solved by technology
Due to these characteristics, in order to ensure reliable sealing during the unloading process when the cone is moving, the design of the metal sealing structure requires the O-shaped rubber sealing ring to provide a large elastic pre-tightening energy storage, so that the specific pressure of the sealing end face is large during normal drilling. The wear of the seal friction pair is large, which affects the seal life
At the same time, in this case, the long-term storage of the roller cone bit will also affect the performance of the rubber parts, thereby affecting the reliability of the seal
Method used
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Embodiment Construction
[0019] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0020] The first embodiment, as shown in Figures 1 and 2, includes a cone 3 and a tooth palm 1. The cone is socketed with the palm journal 2 through the inner hole to form a cone bit bearing. The steel ball 4 passes through the plug hole After putting into the bearing, the plug pin 6 is welded and fixed, the cone 3 is kept on the palm journal 2 by the steel ball 4, and the grease hole 5 provides grease to the drill bit bearing. The inner hole of the cone is equipped with an insert 7, which is made of wear-resistant materials, such as stainless steel, hard alloy, etc. The insert is fixed in the inner hole of the cone 3 by interference fit, and the inner hole of the insert 7 and the shaft The two-phase configuration of the neck constitutes a sliding bearing. A metal end face seal ring 8 is arranged at the root of the upper palm journal of the bearing to ma...
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The present invention relates to a bearing seal structure of a roller cone bit for petroleum geological artesian well, including a roller cone and a bit leg. The roller cone is jacketed with the journal of the bit leg through an inner hole, thus forming an roller cone bit bearing; the root of the bit leg journal on the upper end of the bearing is provided with a metal end-face seal ring collocated with the end face of the inner hole of the roller; the upper end of the metal end-face seal ring is provided with a seal loop; the present invention is characterized in that the seal loop is a metalspring seal loop with a claw-type cross section. The present invention adopts the seal loop made of a metal spring and high-temperature macromolecule material, thus increasing the high-temperature performance and enabling the drill bit to be used in a deeper well and the environment with higher temperature; the sealing performance of the seal loop can be better controlled, thus reducing the wear and tear of the seal surface and increasing the sealing reliability and the service life; the mechanical property of the metal spring of the seal loop has less variation along with the time, thus having a longer storage period and enhancing the reliability of the bearing seal. The present invention has the advantages of simplified journal structure and good processing arts.
Description
technical field [0001] The invention relates to a bearing sealing structure of a roller cone bit for petroleum and geological drilling, and can also be used for bearing sealing of other similar components. Background technique [0002] In order to improve the sealing performance of the roller cone bit, the seal of the bearing can adopt a metal seal structure, such as a single metal seal structure proposed in US Patent No. 4,753,304. This seal structure includes a metal seal ring, a cone insert and an O-shaped seal. Rubber sealing ring, the patent is characterized by the metal end face sealing structure occupying a small axial space and high reliability. US Patent No. 6,026,917 proposes a single-metal sealing structure with a sealing protection pad, which can prevent cuttings from entering the sealing area. This patent is a further improvement on US4,753,304. The above-mentioned metal sealing structure of the roller cone bit can adapt to high pressure and high temperature en...
Claims
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IPC IPC(8): E21B10/22
Inventor 陈志华杨忠新闫秋荣郭国忠
Owner KINGDREAM PLC CO