Novel roller bit sealing ring

A technology of roller cone bit and sealing ring, applied in the field of bearing sealing, can solve the problems of large frictional resistance, aging and wear, and achieve the effect of reducing wear and tear

Active Publication Date: 2012-08-08
CHENGDU SHENGBANG SEALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as Figure 1 to Figure 3 As shown, a new type of cone bit sealing ring is arranged in the sealing groove 3 between the cone shaft hole 1 and the cone shaft journal 2, and both ends of the sealing groove are respectively connected with the internal lubricating oil channel 4 and the external drilling fluid The channel 5 includes a metal skeleton 6 fixed in the sealing groove 3, and the metal skeleton 6 separates the sealing groove 3 into a lubricating oil sealing groove communicating with the internal lubricating oil channel 4 and drilling fluid communicating with the external drilling fluid channel 5 Sealing groove, the lubricating oil sealing groove is provided with a lubricating oil seal, which together with the metal skeleton 6 completely seals and isolates the internal lubricating oil passage 4, and the drilling fluid sealing groove is provided with a drilling fluid seal which is The metal framework 6 completely seals and isolates the external drilling fluid chann...

Embodiment 2

[0031] Such as Figure 4 As shown, in this embodiment, when the lubricating oil pressure is less than 1 MPa, the structure can be adjusted appropriately. The lubricating oil seal is composed of a radial dynamic seal 14 that dynamically seals the axial surface of the tooth palm journal 2 and It is composed of a fixed part fixed with the metal frame 6. The fixed part is composed of a metal fixing part 15 and a rubber gasket 16. The metal fixing part 15 is crimped by the metal frame 6 to press the radial movable seal 14 and the metal frame 6 is crimped At this time, the force is transmitted to the rubber gasket 16 through the metal fixed part 15 and the radial dynamic seal 14 to cause compression, which can seal the lubricating oil leaking between the metal fixed part 15 and the rubber gasket 16. The radial dynamic seal 14 is made of filled polytetrafluoroethylene. Similarly, the dynamic seal contact surface of the seal is provided with first and second spiral grooves 9, 12 respect...

Embodiment 3

[0033] Such as Figure 5 As shown, in this embodiment, when the lubricating oil pressure is less than 1 MPa, the structure can be adjusted appropriately. The lubricating oil seal is a conventional high-pressure rubber oil seal 17 made of rubber, and the others are the same as in embodiment 1. . The high pressure rubber oil seal 17 is a high pressure resistant oil seal structure, which has been widely used in other fields. The purpose mentioned here is to show that all combined sealing methods that adopt the principle of hydrodynamic sealing inside and outside and are similar to the present invention should be protected by patents.

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PUM

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/25
Inventor 余全胜
Owner CHENGDU SHENGBANG SEALS
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