US3760773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas generating and metering device and method
Assignee: Rosemount Inc
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Filing: 1972-03-06
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Granted: 1973-09-25
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Expires: 1992-03-06
Abstract
Abstract An apparatus and method for generating a vaporized liquid additive (e.g., water) at an accurately controlled flow rate primarily to accurately meter the formed vapor additive to a carrier gas stream. The apparatus includes a chamber for additive liquid with a gas vent tube having a capillary orifice, a conduit for carrier gas, and a valve assembly interposed between the gas vent tube and carrier gas conduit for opening and closing flow from the former into the latter. Means is provided for heating the chamber to a temperature within a range selected to vaporize the additive liquid at a predetermined vapor pressure. The flow rate past a capillary orifice of a given size of additive vapor formed in the chamber is dependent only upon temperature. The liquid additive is heated to a closely controlled evaporation temperature at which the vaporized material is imparted a selected vapor pressure and viscosity which, in turn, adjusts the flow rate. The additive vapor is metered into a fixed carrier gas stream in proportion to its flow rate, controlled by the evaporation temperature.
Inventors
- 👤 M Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:03
CPC Classifications
F; F22; F22B; F22B1/00; B; B01; B01D; B01D1/00; B01J; B01J7/00; B01J7/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
An apparatus for generating a vaporized liquid at an accurately controlled flow rate comprising means forming a chamber having a liquid inlet opening, a gas vent tube communicating with said chamber and having a capillary orifice portion with an inner cross-sectional area no greater than about 5 X 10 6 cm2, valve means for blocking and unblocking gas flow through said vent tube, and means for variably heating said chamber to a predetermined temperature within a range.
Claim 2
Independent Claim
77 words
An apparatus for generating a vaporized liquid at an accurately controlled flow rate comprising means forming a chamber having a liquid inlet opening, a gas vent tube communicating with said chamber and having a capillary orifice portion with an inner cross-sectional area no greater than about 5 X 10 6 cm2, valve means for blocking and unblocking gas flow through said vent tube, and means for variably heating said chamber to a predetermined temperature within a range.
Claim 3
Dependent Claim
29 words
An apparatus as in claim 1 in which the cross-sectional area of said vent tube orifice is from about 3 X 10116 8 to 1 X 10 6 cm2.
Claim 4
Dependent Claim
109 words
In an apparatus for accurately metering a vaporized normally liquid additive into a carrier gas stream, means forming a chamber having a liquid inlet opening, a gas vent tube communicating with said chamber having a capillary orifice portion with an inner cross-sectional area no greater than about 5 X 10 6 cm2, a conduit for carrier gas, valve means interposed between said gas vent tube and carrier gas conduit and having a first operating position serving to provide an open passageway therebetween for vaporized additive and a second operating position serving to block said passageway, and means for variably heating said chamber to a predetermined temperature within a range.
Claim 5
Dependent Claim
109 words
In an apparatus for accurately metering a vaporized normally liquid additive into a carrier gas stream, means forming a chamber having a liquid inlet opening, a gas vent tube communicating with said chamber having a capillary orifice portion with an inner cross-sectional area no greater than about 5 X 10 6 cm2, a conduit for carrier gas, valve means interposed between said gas vent tube and carrier gas conduit and having a first operating position serving to provide an open passageway therebetween for vaporized additive and a second operating position serving to block said passageway, and means for variably heating said chamber to a predetermined temperature within a range.
Claim 6
Independent Claim
91 words
A method for generating a vapor from a normally liquid material at an accurately controlled flow rate comprising the steps of forming a reservoir of the liquid in an enclosed chamber, heating the liquid to a selected evaporation temperature, directing the formed vapor through a capillary orifice with a cross-sectional area no greater than about 5 X 10 6cm2, said evaporation temperature being selected to impart a predetermined vapor pressure and viscosity to the vaporized material to accurately control its volumetric flow rate at a desired level through the capillary orifice.
Claim 7
Independent Claim
91 words
A method for generating a vapor from a normally liquid material at an accurately controlled flow rate comprising the steps of forming a reservoir of the liquid in an enclosed chamber, heating the liquid to a selected evaporation temperature, directing the formed vapor through a capillary orifice with a cross-sectional area no greater than about 5 X 10 6cm2, said evaporation temperature being selected to impart a predetermined vapor pressure and viscosity to the vaporized material to accurately control its volumetric flow rate at a desired level through the capillary orifice.
Claim 8
Dependent Claim
13 words
A method as in claim 4 in which the generated material is water.
Claim 9
Independent Claim
123 words
A method for accurately metering a vaporized normally liquid additive into a carrier gas comprising the steps of directing a carrier gas through a conduit at an essentially constant flow rate, forming a liquid reservoir of the additive in an enclosed chamber, heating the liquid additive to a selected evaporation temperature, and directing the formed vapor additive through a capillary orifice with a cross-sectional area no greater than about 5 X 10 6 cm2 and into the carrier gas stream, said evaporation temperature being selected to impart a predetermined vapor pressure and viscosity to the vaporized additive to accurately control its volumetric flow rate through the capillary orifice and thus accurately meter the same at a desired level into the carrier gas stream.
Claim 10
Independent Claim
123 words
A method for accurately metering a vaporized normally liquid additive into a carrier gas comprising the steps of directing a carrier gas through a conduit at an essentially constant flow rate, forming a liquid reservoir of the additive in an enclosed chamber, heating the liquid additive to a selected evaporation temperature, and directing the formed vapor additive through a capillary orifice with a cross-sectional area no greater than about 5 X 10 6 cm2 and into the carrier gas stream, said evaporation temperature being selected to impart a predetermined vapor pressure and viscosity to the vaporized additive to accurately control its volumetric flow rate through the capillary orifice and thus accurately meter the same at a desired level into the carrier gas stream.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |