| 摘要 |
FIELD: process engineering. ^ SUBSTANCE: outer hose is extruded concentric with lengthwise central axis and crimped with the help of partial vacuum fed from outside. Inner hose is extruded concentric with lengthwise central axis of outer hose. Inner hose is welded to recesses of outer hose crimps. Outer hose is expanded by partial vacuum to form pipe coupling. Gas is forced into inner hose at pressure above atmospheric pressure to produce pipe coupling. Note here that inner hose is pressed down for its surface to be extended over the outer hose extended section. Transition section is formed between pipe coupling and adjacent recess of crimp, directed outward relative to central lengthwise axis. Note here that outer pipe transition section is furnished with at least one channel extending towards adjacent crimp ridge. ^ EFFECT: complete fit of entire surface, possibility to weld inner pipe to outer pipe in transition section. ^ 10 cl, 14 dwg |
