Crimped/swaged-on tubing terminations and methods
View Patent ↗A tubing termination comprises a termination portion adapted to make a fluid connection and a tube attachment portion, adapted to receive a tube and to be crimped or swaged. The tube attachment portion comprises a retention mechanism that is adapted to be manipulated during crimping or swaging to bite the tube so as to lock the tube attachment portion relative to the tube. This retention mechanism may take the form of a deformable bite ring, a deflectable c-insert, irregularities defined on an inner surface of the tube attachment portion, and/or the like. The tube attachment portion also may include a resilient sealing mechanism adapted to provide a seal between the tube and the tube attachment portion, and thereby a fluid-tight connection between the tube and the termination portion.
1. A tubing termination comprising:
a termination portion adapted to make a fluid connection; and
a tube attachment portion, adapted to receive a tube and to be crimped or swaged, said tube attachment portion comprising:
a retention mechanism that is adapted to be manipulated during crimping or swaging to bite said tube so as to lock said tube attachment portion relative to said tube;
a resilient sealing mechanism adapted to provide a seal between said tube and said tube attachment portion and thereby a fluid-tight connection between said tube and said termination portion; and
a washer disposed between said retention mechanism and said sealing mechanism, said washer adapted to close seal extrusion gaps between said tube and said tube attachment portion upon crimping or swaging of said tube attachment portion;
wherein said retention mechanism comprises irregularities defined in an inner surface of said tube attachment portion, said irregularities adapted to engage an outer surface of said tube upon crimping or swaging of said tube attachment portion to lock said tube attachment portion relative to said tube;
wherein broaches in said irregularities rotationally lock said tube relative to said tube attachment portion.
2. The tubing termination of claim 1 , wherein locking said tube attachment portion relative to said tube includes rotationally locking and longitudinally locking said tube attachment portion relative to said tube.
3. The tubing termination of claim 1 wherein said irregularities comprise serrations.
4. The tubing termination of claim 3 wherein said serrations longitudinally lock said tube relative to said tube attachment portion.
5. The tubing termination of claim 3 , wherein said serrations comprise threads.
6. The tubing termination of claim 5 , wherein said tube is threaded to threadably mate with said threads defined in an inner surface of said tube attachment portion for initial deployment of said termination on said tube, prior to crimping or swaging.
7. The tubing termination of claim 1 wherein said irregularities comprise knurling.
8. The tubing termination of claim 1 wherein said irregularities comprise nubs.
9. The tubing termination of claim 8 wherein said nubs rotationally lock said tube relative to said tube attachment portion.
10. The tubing termination of claim 1 wherein said sealing mechanism is disposed between said termination portion and said retention mechanism.
11. The tubing termination of claim 1 wherein said retention mechanism is disposed between said termination portion and said sealing mechanism.