Special thread direct connection type large diameter oil pipe sleeve

Abstract

The invention belongs to the petroleum pipeline technical field, and especially relates to a special thread direct connection type large diameter oil pipe sleeve comprising an oil conveying pipe and an oil pipe connecting sleeve; two ends of the oil conveying pipe are processed with outer threads matched with inner thread of the oil pipe connecting sleeve; the thread can be double-teeth or triple-teeth thread, each thread pitch cycle is 8.466 mm in length, and tooth height is 1.982mm; each thread pitch cycle comprises a tooth top and a tooth bottom, and both of which are 4.233 mm in length; in order to improve screwing speed, the lean angle on the tooth bottom of the outer thread on two ends of the oil conveying pipe in a screwing direction is designed to be 30 degrees, and the corresponding opposite direction angle is designed to be 3 degrees; the special thread direct connection type large diameter oil pipe sleeve is simple in structure, reasonable in design, and can effectively improve thread connection screwing speed and intensity.

Description

technical field [0001] The invention belongs to the technical field of petroleum pipelines, and in particular relates to a special thread direct-connection large-diameter oil pipe casing. Background technique [0002] At the connection point of the existing oil pipelines, the connection between the oil pipelines is usually realized by welding at both ends of the pipelines, but there are disadvantages in the existing pipeline connection methods. Poor toughness, long-term use or when a certain section of the pipeline fails, it is inconvenient to maintain. Moreover, when the existing pipeline is connected, the efficiency is poor and the speed is slow. basic guidelines. [0003] In recent years, there have been threaded connecting oil pipes on the market, but the thread design of the existing connecting oil pipes is unreasonable. When the oil pipe is connected and fixed, the thread connection speed between the oil pipe connecting sleeve and the oil pipe is slow, and the firmnes...

AI Technical Summary

Problems solved by technology

[0002] At the connection point of the existing oil pipelines, the connection between the oil pipelines is usually realized by welding at both ends of the pipelines, but there are disadvantages in the existing pipeline connection methods. Poor toughness, long-term use or when a certain section of the pipeline fails, it is inconvenient to maintain. Moreover, when the existing pipeline is connected, the efficiency is poor and the speed is slow. basic principles

[0003] In recent years, there have been threaded connecting oil pipes on the market, but the thread design of the existing connecting oil pipes is unreasonable. When the oil pipe is connected and fixed, the thread connection speed between the oil pipe connecting sleeve and the oil pipe is slow, and the firmness of the oil pipe after connection is poor.

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