Splashguard and inlet diffuser for high vacuum, high flow bubbler vessel
View Patent ↗The present invention is a bubbler having a diptube inlet ending in a bubble size reducing outlet and at least one baffle disc positioned between the outlet of the diptube and the outlet of the bubbler to provide a narrow annular space between the baffle disc and the wall of the bubbler to prevent liquid droplets from entering the outlet to the bubbler. The bubble size reducing outlet is an elongated cylindrical porous metal frit situated in a sump of approximately the same dimensions. A metal frit is placed at the inlet of the outlet of the bubbler. The present invention is also a process of delivering a chemical precursor from a bubbler vessel having the above structure.
1. A bubbler for storing a volatile liquid chemical and delivering vapor of the volatile liquid chemical to a vapor deposition process when under vacuum, the bubbler comprising a cylindrical inside wall having a diameter, a floor, a diptube inlet ending in an outlet proximate the floor and at least one baffle disc affixed to an upper end of the diptube and positioned between the outlet of the diptube and an outlet of the bubbler, wherein the at least one baffle disc has a circumferential edge and a diameter slightly less than the diameter of the inside wall such that the space between the circumferential edge of the baffle disc and the cylindrical inside wall is sufficient to allow the vapor of the volatile liquid to pass through the space with minimum pressure drop, but sufficiently narrow to minimize the passage of liquid that may be ejected from a volatile liquid content under vacuum conditions and high flow rates of a carrier gas through the diptube, wherein the at least one baffle disc is solid and has a concave downward shape to collect condensed volatile liquid chemical for return by coalesced droplets that fall back into the stored volatile liquid chemical, wherein in operation under vacuum conditions, the bubbler is capable of preventing liquid droplets from entering the outlet of the bubbler.
2. The bubbler of claim 1 wherein the outlet is a bubble size reducing outlet.
3. The bubbler of claim 2 wherein the bubble size reducing outlet comprises a porous metal frit.
4. The bubbler of claim 3 wherein the porous metal frit has porosity to filter out particles of 1 micron or larger.
5. The bubbler of claim 4 wherein the porous metal frit has porosity to filter out greater than 90% of particles of 1 micron or larger.
6. The bubbler of claim 1 wherein an inlet to the outlet of the bubbler comprises a porous frit to minimize liquid entering the outlet of the bubbler.
7. The bubbler of claim 1 wherein an inlet to the outlet of the bubbler comprises an elbow configuration to minimize liquid entering the outlet to the bubbler.
8. The bubbler of claim 1 wherein an inlet to the outlet of the bubbler comprises a “Tee” configuration to minimize liquid entering the outlet of the bubbler.
9. The bubbler of claim 1 having at least two baffle discs comprising an upper baffle disc and a lower baffle disc.
10. A cylindrical vapor generation bubbler vessel having a diptube inlet ending in an outlet for delivering a carrier gas into the bubbler vessel and two baffle discs affixed to an upper end of the diptube, wherein the baffle discs have a circular and concave downward shape, the baffle discs comprising an upper baffle disc and a lower baffle disc, wherein the upper baffle disc and the lower baffle disc are positioned between the outlet of the diptube inlet and an outlet of the bubbler vessel configured to provide a narrow annular space between an outer circumferential perimeter edge of the baffle discs and the inside wall of the bubbler vessel, wherein the narrow annular space is capable of minimizing liquid droplets from entering the outlet to the bubbler vessel when the carrier gas is bubbled through a liquid content of the bubbler vessel to dispense the liquid as a vapor from the bubbler vessel and an inlet to the outlet of the bubbler vessel having a configuration selected from the group consisting of an elbow and a Tee shape, wherein at least one of the two baffle disc is solid.