| 摘要 |
<p>A tubular thread connector for oil and gas industries is disclosed. The connector includes a tubular body (2) and a hoop (1). An outer thread is provided on the tubular body (2), and an inner thread is provided on the hoop (1). The outer thread and the inner thread are buttress threads. The ratio between the teeth high and the screw-pitch is 0.25~ 0.35, the load-bearing angle is -15~3º, and the guide angle is 10 ~ 50º. A gap is existed between the teeth top and the teeth bottom after the threads are engaged. A first column-face transition area (4), a column-shaped sealing area (5), a second column-face transition area (6), a taper-shaped sealing area (7) and a cone-face transition area (8) are in turn provided in a sealing part between the tubular body (2) and the hoop (1), and a torque shoulder (9) is formed on the end part of the cone-face transition area (8). The invention uses improved API buttress threads to improve the connection intensity of the threads; in order to ensure a reliable sealing, the invention uses a composite sealing structure formed by the column-shaped sealing area (5) together with the taper-shaped sealing area (7), and the two sealing areas (5,7) are effectively spaced out by the second column-face transition area (6). The invention has advantages of high connection performance, easy operation, reliable sealing, high producing efficiency and rate of finished product, and low cost.</p> |
