| 摘要 |
In a coupling for cylindrical drill pipes made for the transport of different kinds of fluids, it is the object of the invention to provide a combined flange coupling, that can combine the functions and can be assembled under low time consumption and at low costs. This object is accomplished in, that the connecting means are axially directed bolts inserted in the outer wall of the drill rod (1) and extending axially past the end of the drill rod (1) into internally threaded blind holes (21, 22) in the next drill rod to be connected to the first drill rod, and that each terminal surface of a drill rod is made with arrangements (13-17, 23-27) for at least one coupling means, (31, 33) for the transport of different kinds of fluids in the drill string.
|
