High-pressure movable elbow based on four-point contact theory

Abstract

The invention provides a high-pressure movable elbow based on a four-point contact theory. Comprising a male connector and a female connector, the male connector is inserted into the female connector, a plurality of bearing marbles are arranged between the male connector and the female connector, and a plurality of rolling grooves for the bearing marbles to be embedded and roll are formed in the contact face of the male connector and the female connector in the axial direction; the curvature radius of the outer semi-annular rolling groove and the curvature radius of the inner semi-annular rolling groove are larger than the curvature radius of the bearing marbles. The stress state of the elbow is improved through optimization design of the trajectory, the curvature radius of the outer semi-annular rolling groove and the curvature radius of the inner semi-annular rolling groove are set to be larger than the curvature radius of the bearing marble, the bearing marble and the rolling grooves are in four-point contact on the same section, the contact area of the marble and four points of the trajectory is increased, and the stability of the elbow is improved. Therefore, the contact stress between the marble and the trajectory is reduced, the influence of pulsation impact on packing sealing is reduced, the problem of failure and leakage of the packing caused by vibration pulse is thoroughly solved, and the service life of the movable elbow is prolonged.

Description

technical field [0001] The invention relates to the technical field of movable elbows, in particular to a high-pressure movable elbow based on the four-point contact theory. Background technique [0002] At present, the high-pressure movable elbow is a necessary part for the connection of the high-pressure manifold during the construction of oil and gas wells. The connection between the equipment and the wellhead can be realized in any direction through the connection of the movable elbow. However, for a long time, the high-pressure movable elbow has the following defects in the use process: poor sealing at the interface at low pressure, liquid leakage, excessive contact stress of the marble ball, easy to appear indentation, easy to get stuck, short service life And other issues. SUMMARY OF THE INVENTION [0003] The present invention provides a high-pressure movable elbow based on the four-point contact theory by optimizing the ball trajectory of the elbow, so as to imp...

AI Technical Summary

Problems solved by technology

However, for a long time, the high-pressure swivel elbow has the following defects in the use process: poor sealing at the interface at low pressure, liquid puncture leakage, excessive ballistic contact stress, easy indentation, easy jamming, and short service life And other issues

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