Compensated sealed cardan shaft

Abstract

The invention relates to the technical field of oil drilling and cementing, in particular to a compensation type sealed universal shaft. The compensation type sealed universal shaft comprises an upper joint and a lower joint which adopt the same structure and are connected through a connecting rod, wherein each of upper joint and the lower joint mainly comprises a movable hinge, a pressing cap, a ball seat, a ball cap, a locking sleeve, a ball screw, a spring and a screw, wherein the ball screw penetrates through the movable hinge to be connected with the end part of the connecting rod, the connecting rod is prevented from falling off, the ball caps of the joints are fixed at the two end of the connecting rod respectively, the ball seat is mounted in the movable hinge, the back side of the pressing cap is contacted with one end of the spring, the other end of the spring is matched with the screw in threaded connection with the movable hinge, and the locking sleeve is in threaded connection with the movable hinge. The compensation type sealed ball screw universal shaft adopts an oil seal manner, so that the use environment of an internal structure of the universal shaft is guaranteed, the service life of the universal shaft is prolonged, and the safety coefficient of the universal shaft is increased.

Description

technical field [0001] The invention relates to the technical field of oil drilling and cementing, in particular to a compensation type sealed cardan shaft. Background technique [0002] At present, the purpose of the cardan shaft of the screw drilling tool used in oil and natural gas drilling projects is to convert the eccentric motion of the motor rotor into the fixed axis motion of the transmission shaft, and the life of the cardan shaft determines the life of the screw drilling tool. Machine life. At present, there are three structural forms of the cardan shaft of general screw drilling tools, a petal type, a spherical structure, and a ball column type. The petal type has a simple structure (joint-connecting rod-joint), is completely eroded by drilling fluid, has a short service life and complex processing technology. The main working parts of the spherical cardan shaft structure are protected by the sealing sleeve, and the service life is longer, but because the large...

AI Technical Summary

Problems solved by technology

The petal type has a simple structure (joint-connecting rod-joint), is completely eroded by drilling fluid, has a short service life and complicated processing technology

The main working parts of the spherical cardan shaft structure are protected by the sealing sleeve, and the service life is longer, but because the large ball and the ball seat bear a large load, especially the wear of the ball seat is more serious, which affects the life of the ball cardan shaft , the structure of the ball-column type cardan shaft and the ball-type cardan shaft is basically the same, but the small ball is changed into a ball-column transmission, but the above situation also exists

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