| 摘要 |
The injection head (10) includes a cylindrical outer body (12) defining a central, longitudinal axis (z) with an upper inlet (13) for receiving fluids from a string of tubular rods. One or more helical ducts (20a, 20b) impart to the fluids a helical motion around the axis (z) towards respective outlet side nozzles (11). Respective gradually downwardly tapered duct sections (17a, 17b) are interposed between the upper inlet (13) and the helical ducts (20a, 20b). The tapered ducts (17a, 17b) have straight geometric axes and are connected to the respective helical ducts at locations (19a, 19b) axially offset from the central axis (z) and near the periphery of the body (12).
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