Double-seal enclosed universal shaft

Abstract

The invention relates to the technical field of petroleum drilling and well cementing, in particular to a double-seal enclosed universal shaft. The double-seal enclosed universal shaft comprises an enclosed connecting rod, wherein the upper end and the lower end of the enclosed connecting rod are connected with universal joints with the same structures respectively; the universal joints comprise movable hinges, locking sleeves, clamping rings, ball seats, transmission columns, ball heads, fixed hose clamps, sealing sleeves and rectangular sealing rings; the ball seats are fixed to the bottoms of the inner cavities of the movable hinges; the ball heads are matched with the ball seats; a rolling groove is formed around the end part of the enclosed connecting rod in the circumferential direction; the transmission columns are arranged between the rolling groove and the inner cavities of the movable hinges; the rectangular sealing rings are arranged between the rolling groove and the inner cavities; the bottoms of the rectangular sealing rings are fixed through the clamping rings; the locking sleeves are in threaded connection with the movable hinges; the bottoms of the locking sleeves are used for positioning and fixing the clamping rings and the rectangular sealing rings. The double-seal enclosed universal shaft has the advantages of simple structure, easiness in machining and assembly, convenience in accessory replacement, long service life and low production cost.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling and well cementing, in particular to a double-sealed closed Vientiane shaft. Background technique [0002] At present, the screw drilling tools used in oil and gas drilling projects are powered by mud pumps, and the mud is used as the medium to enter the screw motor, and the movement of the motor is eccentric motion. In order to convert eccentric motion into fixed axis motion, We add cardan shafts between the drive shaft and the motor. Generally, the ball and column of the universal joint shaft has a single seal structure, and the connecting rod is an open structure. This structure uses grease as a lubricant, and the sealing sheath prevents mud from entering the inside of the live winch. The open structure makes the universal joint shaft swing smoothly without jamming. . However, due to the excessive swing of the cardan shaft during the drilling process, the throat hoop of the sealing...

AI Technical Summary

Problems solved by technology

However, due to the excessive swing of the cardan shaft during the drilling process, the throat hoop of the sealing sleeve fails to fall off or the rubber sheath is accidentally damaged, resulting in the failure of the live twist seal, resulting in increased internal wear and reduced service life; the transmission in the open structure The column has axial sliding friction with the live twist and the open connecting rod respectively, and the friction displacement is large, and the wear speed is fast, so that the transmission column fails to transmit torque.

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