| 摘要 |
An infusing unit is employed in a bubble-forming apparatus which includes a venturi-tube type inlet pipe unit, a discharge pipe unit, and a branch pipe. The infusing unit includes an infusing casing with a large-diameter upper section within which a main pipe section of the inlet pipe unit is press-fitted so as to establish a fluid-tight seal therebetween, and a small-diameter lower section located coaxially within the discharge pipe unit. A truncated conical lower end portion of the inlet pipe unit is located within the large-diameter upper section of the infusing casing and ranges from 1.0 mm to 1.7 mm in inner diameter. The infusing casing further has an integral tubular section which extends radially and outwardly from the lower section of the infusing casing and which is press-fitted into the branch pipe. The integral tubular section ranges from 2.5 mm to 3.5 mm in inner diameter. The lower section of the infusing casing has a tapered upper portion which decreases gradually downward in inner diameter, and a straight lower portion which extends integrally and downwardly from the tapered upper portion and which has an axial length ranging from 2.0 mm to 4.0 mm and an inner diameter ranging from 2.0 mm to 3.0 mm.
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