| 主权项 |
1. A dip tube comprising:
a main dip tube section; a first input section capped by a first hydrophilic membrane to prevent air from entering into the first input section during a use of the dip tube; and a second input section capped by a second hydrophilic membrane to prevent air from entering into the second input section during the use of the dip tube, wherein the first input section and the second input section are joined to the main dip tube section; wherein at least one of the first input section and the second input section includes a venturi region; wherein the venturi region includes a first venturi portion with a first venturi cross sectional flow area taken perpendicular to a flow direction of the venturi region, a second venturi portion with a second venturi cross sectional flow area taken perpendicular to the flow direction of the venturi region, and a third venturi portion with a third venturi cross-sectional flow area taken perpendicular to the flow direction of the venturi region, wherein the second venturi portion is positioned between the first venturi portion and the third venturi portion, the second venturi cross sectional flow area is less than the first venturi cross sectional flow area, the second venturi cross sectional flow area is less than the third venturi cross sectional flow area, the first venturi cross sectional flow area is less than the third cross sectional flow area, and the first cross sectional flow area is positioned downstream along the flow direction relative to the third cross sectional flow area. |
