| 摘要 |
1. Butt joint of two air duct sections made of sheet steel with a wall (12, 12') of circular or flat, oval section, each with a connection flange (32) at least at one end to make said butt connection with an adjoining section, at least one outwardly projecting from the wall (12, 12') an annular edge is provided and moulded to form one part, said connection flanges (32) comprise a clamping leg, directed conically backwards from their outer end to the adjoining wall (12, 12') and kept clamping ring (34) put on them, adjoining by a conical side legs (38) to clamping legs (24) of the connection flanges, characterized in that each connection flange (32) is moulded, to form one part, to the duct wall (12, 12') while the annular edge (14), forming an integral part of the connection flange (32) and each annular edge (14) forms in an unloaded condition an angle (α) <= 90 degree preferably 80 degree to 90 degree , and at its radially inner end passes over with a sharp bed into the wall (12, 12'). 2. Butt joint according to Claim 1, characterized in that the annular edge in an unloaded condition an forms with the associated duct wall (12, 12') an angle of 87 degree to 89 degree . 3. Butt joint according to Claim 1 or 2, characterized in that the clamping leg (24) passes over at its radially inner end into the supporting leg, resting on the annular edge (14) and/or the associated duct wall (12, 12'). 4. Butt joint according to Claim 1-3, characterized in that the duct wall (12, 12') has a smooth inside longitudinal welded seam (44). 5. Butt joint according to Claim 1-3, characterized in that the duct wall (12, 12') has a spiral-wound rabbet (44'). 6. Butt joint according to any of the preceding Claim, characterized in that an elastic sealing (40) is arranged on the inner side of the clamping ring (34) pressed into the radially outer end of the wedge-shaped chink (20) between the annular edges (14). |
