Screw joint coupling for oil pipes
US4623173A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1984 |
| Grant date | Nov 18, 1986 |
| Priority date | — |
| Expiry date | Sep 5, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L15/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A basic structure of a screw joint coupling for oil pipes according to the invention is that a main sealing portion is constructed with a sealing portion formed axially in convex at an end of a male screw, and with a sealing portion formed in taper at an inner side of a female screw, and that the male screw and the female screw are butted at an end point of the former and an end part of a stopper formed at an inner side of the latter. The main sealing portion has a shrinkage allowance .DELTA.D of the seal part, which is regulated in size in a relation between a shrinkage allowance .DELTA.d of the screw and a pressure P of the sealing part. In addition, specific values are selected as to the load flank angle, the radius of curvature in convex of the sealing portion of the male screw, and the tapering angle of the sealing portion of the female screw.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.