| 摘要 |
<p>In an apparatus for mixing gases with and dissolving gases in bodies of liquid there is an axial-flow pump impeller (22), which is arranged to raise the liquid through a substantially vertical riser line (20) whose lower end exhibits an inlet (15) for the liquid and whose upper end forms an outlet (11) for the pumped liquid and is defined by guide surfaces (7) arranged to deflect the liquid radially from the axis of the riser line (20), the drive shaft (4) of the impeller extending coaxially with the riser line from a drive unit, located above the said body of liquid, to the impeller (22), the improvement in which the drive shaft (4) is enclosed by a stationary line (16) whose inner wall together with the drive shaft (4) defines a gas-communication passage (17) whose lower end discharges into the riser line (20) via at least one outflow passage (19) directed substantially radially to the general center line, said gas-communication passage openly communicating with a gas source, such as the surrounding atmosphere, as illustrated in FIG. 1.</p> |
