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Circular arc thread dental pattern

A technology of thread teeth and arcs, which is applied in the connection field of pipes conveying liquid media, can solve the problems of joint loosening and leakage, and achieve the effects of solving tensile deformation, good sealing performance, and reducing machining allowance

Active Publication Date: 2012-05-30
GUANGDONG LIFENG PIPELINE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the reduction of the gap between the wall thickness of the pipe and the bottom wall thickness of the thread groove, it completely solves the problem that the threaded joint of the pipe is stretched and deformed by the axial force amplification effect of the temperature difference of the pipe, and the problem of joint loosening and leakage occurs

Method used

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  • Circular arc thread dental pattern
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Experimental program
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Embodiment Construction

[0010] An arc thread profile is composed of an upper tooth top arc 5 and a lower tooth bottom arc 6 which are tangent to each other and have equal arc diameters. When the pitch 13 is P and the tangent angle 9 of the tangent point 7 is α, its upper and lower arc radius 11R is less than or equal to 0.25R / cos α / 2, and the tooth height 12H is less than or equal to 0.5P(1 / cosα / 2-tgα / 2). When the inner and outer arc toothed mouthpieces 1 and 2 of the same specification are screwed together, since the inner and outer arc toothed mouthpieces have the same conicity 10, equal arc diameter 11 and equal tooth height 12, so the The contact surfaces of the inner and outer tooth forms form a circular arc connection 8 curved up and down, which avoids the gap formed by the traditional triangular thread crest and tooth bottom corner. Since the crest and bottom of this tooth type are both arc-shaped, it is convenient for thin-walled metal pipes with a wall thickness of 3 equal to a thickness o...

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Abstract

The invention discloses a circular arc thread dental pattern which is suitable for cutting and forming threads as well as forming the threads by a metal pipe through a rolling process, wherein the wall thickness of the pipe is equal to the wall thickness of slot bottoms of the threads. The dental pattern is a novel dental pattern which can thoroughly solve the problem that the junction pipe of the threads is stretched, loosened and leaked due to the stress of the working temperature difference of a pipeline and create a strong-application dental pattern with the utilization rate of 100% of the material of the junction pipe of the threads. Meanwhile, the outer force bearing strength of the junction is equal to that of the pipe, thereby the dental pattern has important meaning for safely popularizing the metal pipe with thin wall.

Description

technical field [0001] The patent of the present invention relates to a pipe, especially the connection of pipes conveying liquid medium. Background technique [0002] Pipes conveying liquid media can only work normally by relying on reliable connections, and threaded interface connections are the most convenient and commonly used connection methods for pipe connections. [0003] The thread that the known pipe interface is connected at present has the triangular thread form of 60 ° and 55 °. Since this kind of thread profile is manufactured by cutting and forming, the wall thickness of the pipe must increase the thickness of the cutting thread depth. This not only causes the serious waste phenomenon that the effective utilization rate of pipe material is very low (for example, according to the national standard 3 / 4 inch water, the outer diameter of the gas delivery steel pipe is 26.75 millimeters, and the thread groove bottom diameter is 24.12 millimeters, when the pipe wal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L15/06B23G1/02B21H3/02
Inventor 程宇婷
Owner GUANGDONG LIFENG PIPELINE TECH CO LTD