Taper threaded joint

A tapered thread and threaded connection technology, which is applied in the direction of threaded connection, pipe/pipe joint/pipe fitting, mechanical equipment, etc.
CN1433510AInactive Publication Date: 2003-07-30SUMITOMO METAL IND LTD +1
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
SUMITOMO METAL IND LTD
Publication Date
2003-07-30
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The gap L (mm) which is the smaller of the gap L1 (mm) between the crest 1a of a tapered male thread 1 and the root 2b of a tapered female thread 2, and the gap L2 (mm) between the root 1c of the tapered male thread 1 and the crest 2c of the tapered female thread 2, the load flank angle alpha ( DEG ) and the stab flank angle beta ( DEG ), and the axial gap delta (mm) which forms in the widthwise direction and is the difference between the thread ridge width of the tapered male thread 1 and the thread valley width of the tapered female thread 2 threadingly engaged therewith have the following relationship <DF> delta ≀ L.(tan alpha + tan beta ) < / DF> When interference of the threaded portions is necessary, the initial set thread interference H is H > 2L. As a result, a thread having sufficient resistance to tensile force and compressive force can be easily manufactured within manufacturing tolerances. In particular, it has good sealing properties and increased reliability as a threaded joint for an oil well pipe having a metal seal portion.
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Description

technical field

[0001] The present invention relates to a joint with tapered threads for connecting oil well pipes, for example, to each other. Background technique

[0002] When the taper thread is connected, the external thread and the internal thread are threadedly engaged with each other. Not only do the load flanks come into contact with each other but also between the crest of the male thread and the root of the female thread, or between the root of the male thread and the crest of the female thread, or the entry on the opposite side (rear side) of the load flank. When contact occurs between the stab flanks, tightening is prevented and relative movement in the radial direction of the thread is also prevented. Normally, when the crest or root of the male thread is in contact with its opposite root or crest, tightening is prevented and further thread engagement between the male and female threads is prevented.

[0003] If the tightening force (torque) is further increa...

Claims

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