Hybrid thread geometry for threaded fitting
US-2021033136-A1 · Feb 4, 2021 · US
Threaded joint for steel pipes
US11415246B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11415246-B2 |
| Application number | US-201816762590-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 29, 2018 |
| Priority date | Dec 5, 2017 |
| Publication date | Aug 16, 2022 |
| Grant date | Aug 16, 2022 |
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- Title
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Abstract
Official abstract text for this publication.
The threaded joint includes a pin and a box. The pin includes a taper male thread part, and the box includes a taper female thread part to be engaged with the taper male thread part. The male thread part is divided into a first region on the free end side of the pin, and a second region on the tubular side of the pin along a tube axis direction. The taper ratio of the first region is greater than the taper ratio of the second region. The taper ratio of the first region is greater than the taper ratio of the female thread part. The taper ratio of the second region is equal to or greater than the taper ratio of the female thread part.
First claim
Opening claim text (preview).
The invention claimed is: 1. A threaded joint for steel pipes, the threaded joint comprising a tubular pin and a tubular box, wherein the pin includes a taper male thread part, and the box includes a taper female thread part to be engaged with the taper male thread part, the taper male thread part is divided into a first region on a free end side of the pin and a second region on a tubular side of the pin along a tube axis direction, and a taper ratio of the first region is greater than a taper ratio of the second region, the taper ratio of the first region is greater than a taper ratio of the taper female thread part, and the taper ratio of the second region is equal to or greater than the taper ratio of the taper female thread part, the pin further includes a shoulder face arranged on a free end of the pin and a sealing face arranged between the shoulder face and the taper male thread part, and the box further includes a shoulder face corresponding to the shoulder face of the pin and a sealing face corresponding to the sealing face of the pin. 2. The threaded joint for steel pipes according to claim 1 , wherein Tp 1 , Tp 2 and Tb satisfy the conditions of Formulae (1), (2) and (3), where Tp 1 is the taper ratio of the first region, Tp 2 is the taper ratio of the second region, and Tb is the taper ratio of the taper female thread part: 1.00 <Tp 1 /Tb< 1.10 (1) 1.00 ≤Tp 2 /Tb< 1.10 (2) 0.94 <Tp 2 /Tp 1<1.00 (3). 3. The threaded joint for steel pipes according to claim 2 , wherein x is within a range from 20% or more of L to 80% or less of L, where L is the total length in the tube axis direction of the taper male thread part, and x is the distance in the tube axis direction from an end of the taper male thread part on the free end side of the pin to the border between the first region and the second region. 4. The threaded joint for steel pipes according to claim 1 , wherein x is within a range from 20% or more of L to 80% or less of L, where L is the total length in the tube axis direction of the taper male thread part, and x is the distance in the tube axis direction from an end of the taper male thread part on the free end side of the pin to the border between the first region and the second region.
Assignees
Inventors
Classifications
characterised by the shape of the screw-thread · CPC title
with axial sealings having at least one plastically deformable sealing surface (with sealing rings F16L15/003) · CPC title
- F16L15/001Primary
with conical threads · CPC title
- E21B17/042Primary
Threaded · CPC title
with additional sealings · CPC title
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- What does patent US11415246B2 cover?
- The threaded joint includes a pin and a box. The pin includes a taper male thread part, and the box includes a taper female thread part to be engaged with the taper male thread part. The male thread part is divided into a first region on the free end side of the pin, and a second region on the tubular side of the pin along a tube axis direction. The taper ratio of the first region is greater th…
- Who is the assignee on this patent?
- Nippon Steel Corp, Vallourec Oil & Gas France
- What technology area does this patent fall under?
- Primary CPC classification F16L15/001. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Aug 16 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).