Eccentric constant-width seal groove of cone bit
A technology of bearing sealing and roller cone bits, which is applied in construction and other directions, can solve the problems of reducing the ability of sealing rings to adapt to high speeds, large frictional resistance and frictional heat, and shortening the service life of sealing rings, so as to improve the ability to adapt to high speeds , prolong the life of the seal, and reduce the effect of design requirements
Inactive Publication Date: 2012-07-25
幸发芬
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Problems solved by technology
Large compression ratio produces large frictional resistance and frictional heat, which reduces the ability of the sealing ring to adapt to high speed and shortens the service life of the sealing ring
Method used
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Embodiment Construction
[0012] figure 1 It is a typical structural diagram of the present invention. The palm bearing 1 cooperates with the cone inner hole 2 to form the bearing of the cone bit. The palm bearing includes a radial pressure-bearing cylinder 5 and a sealing cylinder 7 . The inner hole of the cone includes a radial pressure bearing cylinder 6 and a sealing cylinder 8 . The sealing groove 3 is formed by the palm bearing sealing cylinder and the cone inner hole sealing cylinder. An elastic sealing ring 4 is installed in the sealing groove 3 . When the roller cone bit is working, it is stressed in the direction of the force side F. The palm bearing is in contact with the inner hole of the cone on the F side, and produces a radial clearance A on the other side. There is an eccentricity C and a diameter difference B between the tooth palm sealing body 7 and the tooth palm pressure cylinder 5 . The diameter difference B is equal to the radial clearance A. The direction of eccentricity i...
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The invention belongs to the technical field of bearing sealing for cone bits, and particularly relates to an eccentric constant-width seal groove of a cone bit, which mainly comprises a cone leg bearing, a cone inner hole, a seal groove and a seal. The seal groove is formed by a seal cylinder of the cone leg bearing and a seal cylinder with the cone inner hole. The eccentric constant-width seal groove is characterized in that a radial clearance A is reserved between the cone leg bearing and the cone inner hole; the seal cylinder of the cone leg bearing is eccentric to the bearing cylinder by eccentricity C, and the seal cylinder and the bearing cylinder have a diameter difference B which is equal to the radial clearance A; the eccentric direction is the same as the direction of stress to a cone, and the eccentricity is half of the diameter difference, namely C = (1 / 2)B; due to the eccentricity and the diameter difference, the peripheral width of the seal groove and the peripheral compressibility of a seal ring of the seal groove cannot change because of the bearing clearance during operation of the cone bit; as the width of the seal groove and the compressibility of the seal ring are stable, the compressibility of the elastic seal can be designed within a low range; and adaptability of the bearing seal to high rotational speed is improved, and the service life of the bearing seal ring is prolonged.
Description
technical field [0001] The invention belongs to the technical field of roller cone bit bearing sealing. Sealed roller cone bits suitable for petroleum, geology and engineering. Background technique [0002] The life of the roller cone bit mainly depends on the bearing. The life of the bearing mainly depends on the seal. The task of sealing is to prevent the grease leakage in the bearing, and to prevent the corrosive and abrasive mud outside the drill bit from invading the bearing. Once the seal fails, the bearings will wear out very quickly, causing the bit to fail. [0003] The sealing of the roller cone bit generally relies on the radial compression of the elastic sealing element to realize its sealing function. For example, what patents US5524718 and US5655611 adopted was an O-shaped sealing ring, what patents US 3765495 and US 4037673 adopted was a rectangular sealing ring, what patents CN 201080787Y, US 6033117, and US 6254275 B1 adopted were double sealing rings, a...
Claims
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Inventor 幸发芬
Owner 幸发芬