Compound seal roller bit
A roller cone bit and composite sealing technology, applied in construction and other directions, can solve the problems of unsuitable rubber sealing, complex production process and high manufacturing cost, and achieve the effect of prolonging life, improving sealing effect and avoiding rotation.
Active Publication Date: 2015-01-21
TIANJIN LILIN BIT
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Problems solved by technology
Among the drill bits produced by major drilling tool manufacturing companies at home and abroad, rubber seals are not suitable for high-speed drilling and will fail quickly at high speeds. Metal seals are suitable for high-speed drilling, but the production process is complicated and the manufacturing cost is high; therefore, the design and production of sealing effect The sealing structure of the roller cone bit with better and lower manufacturing cost has always been the focus of technical personnel
Method used
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Embodiment Construction
[0010] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0011] to combine figure 1 and figure 2 As shown, the roller cone drill bit of the present invention comprises a tooth palm 7 and a cone 1, and the tooth palm 7 and the cone 1 are rotatably matched to each other through the palm journal and the cone shaft hole, and a sealing groove is arranged at the opening of the cone shaft hole to seal A sealing member is arranged in the groove, and the sealing member includes a stationary seal and a sliding seal, wherein the stationary seal is fixed on the palm journal, the sliding seal is arranged between the stationary seal and the side wall of the sealing groove, and the sliding seal The sliding friction surface is formed at the contact position between the part and the static seal; during specific implementation, the sliding seal is a rubber sealing ring 4, and the cross-sectional shape of the rubber sealing...
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The invention discloses a compound seal roller bit. The palm and the cone of the roller bit are matched with each other in a rotatable mode via a palm shaft neck and a cone axle hole, the opening of the cone axle hole is provided with a seal groove, a rubber sealing ring is arranged in the seal groove, a built-in wear-resisting ring is also embedded in the rubber sealing ring, a second metal ring and a second rubber ring are also arranged in the seal groove, the second metal ring is fixed on the palm shaft neck via screw threads or interference fit, the second metal ring presses the second rubber ring on the palm shaft neck, and the contact surface of the outer side of the second metal ring and the rubber sealing ring forms a sliding friction surface; the built-in wear-resisting ring is biased in the middle position of one side of the sliding friction surface of the rubber sealing ring; and for the rubber sealing ring in a relaxed state, the built-in wear-resisting ring is slightly extruded out of the rubber surface of one side of the sliding friction surface of the rubber sealing ring. The invention improves the sealing effect of a bearing system of the roller bit, and is favorable for reducing the manufacturing cost of the roller bit.
Description
technical field [0001] The invention relates to the technical field of geological exploration and drilling tools, in particular to a composite sealed roller cone drill [0002] head. Background technique [0003] The roller cone bit is a drilling tool widely used in oilfield drilling, geological exploration and engineering fields. The application environment of the roller cone bit is quite complicated. Both the sliding bearing and the rolling bearing require a sealing system suitable for the complex environment. Since the sealing system is in an environment of relative motion and mutual friction, its service life is very short. At present, there are two types of roller cone bits widely used at home and abroad: rubber seal and metal seal. Since drilling needs to operate under high speed, high drilling pressure and high impact environment, the sealing of the bearing system is very critical. Among the drill bits produced by major drilling tool manufacturing companies at home ...
Claims
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IPC IPC(8): E21B10/25
Inventor 薛中学
Owner TIANJIN LILIN BIT