| 摘要 |
A bubble generator is constructed to include a cylindrical casing, a tapered tube suspended in a front open side of the casing and adapted for guiding water into the casing, the tapered tube having recessed holes on the inside adapted for causing a negative pressure when water passing through the tapered tube into the inside of the casing toward the water outlet, a rod member axially slidably inserted through a rear closed side of the casing into the inside of the tapered tube, and a stopper fixedly fastened to the rod member and moved with the rod member to adjust the gap between the stopper and the tapered tube.
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