| 摘要 |
<p>In a gas-liquid contact apparatus, liquid is distributed onto packing media (10) by vertical flow tubes (24) mounted on a horizontal deck (20). Each flow tube has a beveled upper end (46), an upper portion above the deck provided with one or more vertical slots (34, 36) for admitting liquid into the tube, and a lower portion extending below the deck for releasing liquid onto the packing media. The lower portion of the tube may have internal vertical louvers (52) and a nontubular depending tail portion (54). The tube is precisely immovably secured in both orientation and elevation to the deck by an external circumferential rib (38) bearing against the upper surface of the deck, and one or more staking protrusions (40) that bear against the lower surface of the deck. The tube is made from a flat blank of sheet material (59) which has a first pair of opposed edges provided with locking tabs (61), a second pair of opposed edges that eventually form the top and bottom ends of the tube, and a rib (38) that is generally perpendicular to the first pair of opposed edges. The blank is deformed to form a tube (24) in which the locking tabs (61) engage each other and the rib (38) is positioned externally and circumferentially. The tube is inserted in a deck opening until the rib (38) engages the upper surface of the deck (20), and the tube is locked in its precise final position by protrusions (40) that engage the lower surface of the deck. The tubes are field-replaceable.</p> |
