| 摘要 |
The invention is directed to a flexible pipe connecting unit which includes a part made of elastic workable material. The pipe connecting unit includes a wave-shaped or hose-shaped bellows ( 4 ) made of elastomeric material. The bellows ( 4 ) has respective projecting flange collars ( 14; 14 a , 14 b) at its respective ends. The flange collars ( 14; 14 a , 14 b) preferably are provided with a reinforcement insert ( 16; 16 a , 16 b) and annularly-shaped pipe connecting pieces (flanges 18; 18 a , 16 b) are disposed behind corresponding ones of the flange collars. The pipe connecting unit ( 2 ) coacts directly with weld-on flanges as counter flanges ( 20; 20 a , 20 b) without additional seals or corresponding joining locations. For this purpose, the end sealing faces of the flange collars ( 14; 14 a , 14 b) are partitioned in the radial direction by a peripherally extending slot ( 28; 28 a , 28 b). In this way, at least two coaxial concentric annularly-shaped sealing surfaces ( 14 -I, 14 -II) are formed. With outer weld-on or slip-on flanges ( 20; 20 a , 20 b), only corresponding ones of the outer annular sealing Surfaces ( 14 -I) are in contact engagement and, when the counter flange ( 20; 20 a , 20 b) is a welding-neck flange, at least the outer sealing annular surface ( 14 -I) comes into contact engagement. A stabilization ring ( 32 ) can be implanted in the slot ( 28; 28 a , 28 b) of the flange collar ( 14; 14 a , 14 b) between the outer annular sealing surface ( 14 -I) and the inner annular sealing surface ( 14 -II).
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