Novel roller bit sealing ring

Abstract

The invention discloses a novel roller bit sealing ring, which belongs to the field of bearing sealing. The novel roller bit sealing ring is disposed in a sealing groove between a bearing shaft hole and a tooth palm journal. Both ends of the sealing groove are respectively communicated with an inside lubricating oil channel and an outside drilling fluid channel. The novel roller bit sealing ring comprises a metal framework fixed in the sealing groove, the metal framework separates the sealing groove into a lubricating oil sealing groove communicated with the inside lubricating oil channel and a drilling fluid sealing groove communicated with the outside drilling fluid channel. A lubricating oil sealing part is disposed in the lubricating oil sealing groove and completely seals and separates the inside lubricating oil channel together with the metal framework. A drilling fluid sealing part is disposed in the drilling fluid sealing groove and completely seals and separates the outside drilling fluid channel together with the metal framework. The novel roller bit sealing ring is more suitable for severe environment of drilling work, and capable of more effectively and simultaneously separating lubricating oil and drilling fluid, rock debris and the like. Separation of lubricating oil and separation of drilling fluid do not affect each other, and service life of a sealing device is prolonged.

Description

technical field [0001] The invention belongs to the field of bearing seals, in particular to bearing seals for roller cone bits used in petroleum or geological drilling. Background technique [0002] The life of the roller cone bit mainly depends on the life of the drill bearing, and the life of the bearing depends largely on the life of the seal. The American Hughes Company predicts the life of the drill according to the reliability of the seal. The current development trend of roller cone bits is high-speed rotation speed, and the working conditions are getting worse and worse. Especially in oil drilling, as the drilling depth gets deeper and deeper, the weakness of ordinary bearing sealing rings becomes more and more prominent. [0003] The function of the drill bit bearing seal is to separate the bearing from the bottom hole drilling fluid, prevent bottom hole drilling fluid, cuttings, etc. from entering the bearing, and at the same time keep the bearing lubricating oil ...

AI Technical Summary

Problems solved by technology

However, the surface friction coefficient of rubber is very large, and in order to play a sealing role, it must have a large interference with the matching parts. Therefore, under the condition of high-speed rotation of the bearing, the friction resistance is large, the heat rise is high, and the wear and aging are serious. Guarantee the service life of the bearing

A variety of improved sealing forms have also appeared one after another. For example, adding PTFE and molybdenum disulfide to the rubber can properly reduce the friction coefficient of the rubber, but the friction resistance is still very large, and the dynamic sealing performance is not ideal. Difficult to meet bearing life requirements

Others, such as adding metal dynamic sealing structures, also have various shortcomings, so it is difficult to achieve the ideal service life requirements

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