US3717006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transit handling system for volatile fluids
Assignee: Parker Hannifin Corp
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Filing: 1971-05-27
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Granted: 1973-02-20
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Expires: 1991-05-27
Abstract
Abstract A portable system for refilling aircraft dewars with liquid nitrogen for fuel tank inerting and with liquid oxygen for emergency breathing. In the case of filling of the oxygen dewar, the system has a filling sub-system which removes moisture and particulate matter from the fluid stream, a saturating sub-system which controls the vapor-liquid equilibrium temperature of the incoming fluid from the filling sub-system, a storage sub-system of which the liquid nitrogen storage portion provides a heat sink for the oxygen to eliminate evaporation losses and to maintain the liquid oxygen at two different temperatures, and a delivery sub-system which transfers the stored liquid into the aircraft dewar at any preselected condition between the two storage temperatures.
Inventors
- 👤 C Kimmel
- 👤 J Moll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:00
CPC Classifications
F; F17; F17C; F17C9/00; F17C2205/00; F17C2205/01; F17C2205/0123; F17C2205/013; F17C2205/0149; F17C2205/03; F17C2205/0302; F17C2205/0323; F17C2205/0326; F17C2205/0332; F17C2205/0338; F17C2205/0341; F17C2221/00; F17C2221/01; F17C2221/011; F17C2223/00; F17C2223/01; F17C2223/0107; F17C2223/0123; F17C2223/03; F17C2223/036; F17C2250/00; F17C2250/03; F17C2250/032; F17C2250/04; F17C2250/0404; F17C2250/0408; F17C2250/043; F17C2250/0439; F17C2250/06; F17C2250/0605; F17C2250/0626; F17C2250/0631; F17C2250/0636; F17C2250/07; F17C2250/072; F17C2265/00; F17C2265/02; F17C2265/022; F17C2270/00; F17C2270/01; F17C2270/0186; F17C2270/0189
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
135 words
A system for refilling an aircraft dewar with a volatile liquid for use in a gaseous form, said system comprising storage dewars and containing volatile liquid in fluid communication with each other; means to maintain the liquid within the storage dewars at different temperatures, the liquid which is warmer being sufficiently saturated to have a vapor pressure capable of maintaining the other container in a filled condition; mixing valve means; delivery line means from said dewars through which said liquid from both containers is delivered under the influence of such vapor pressure through said mixing valve means to the aircraft dewar, said mixing valve means being adapted to proportion and mix the warmer and colder liquid so that the liquid ultimately dispensed has a predetermined temperature between the temperatures of said warmer and colder liquid.
Claim 2
Independent Claim
135 words
A system for refilling an aircraft dewar with a volatile liquid for use in a gaseous form, said system comprising storage dewars and containing volatile liquid in fluid communication with each other; means to maintain the liquid within the storage dewars at different temperatures, the liquid which is warmer being sufficiently saturated to have a vapor pressure capable of maintaining the other container in a filled condition; mixing valve means; delivery line means from said dewars through which said liquid from both containers is delivered under the influence of such vapor pressure through said mixing valve means to the aircraft dewar, said mixing valve means being adapted to proportion and mix the warmer and colder liquid so that the liquid ultimately dispensed has a predetermined temperature between the temperatures of said warmer and colder liquid.
Claim 3
Independent Claim
135 words
A system for refilling an aircraft dewar with a volatile liquid for use in a gaseous form, said system comprising storage dewars and containing volatile liquid in fluid communication with each other; means to maintain the liquid within the storage dewars at different temperatures, the liquid which is warmer being sufficiently saturated to have a vapor pressure capable of maintaining the other container in a filled condition; mixing valve means; delivery line means from said dewars through which said liquid from both containers is delivered under the influence of such vapor pressure through said mixing valve means to the aircraft dewar, said mixing valve means being adapted to proportion and mix the warmer and colder liquid so that the liquid ultimately dispensed has a predetermined temperature between the temperatures of said warmer and colder liquid.
Claim 4
Independent Claim
135 words
A system for refilling an aircraft dewar with a volatile liquid for use in a gaseous form, said system comprising storage dewars and containing volatile liquid in fluid communication with each other; means to maintain the liquid within the storage dewars at different temperatures, the liquid which is warmer being sufficiently saturated to have a vapor pressure capable of maintaining the other container in a filled condition; mixing valve means; delivery line means from said dewars through which said liquid from both containers is delivered under the influence of such vapor pressure through said mixing valve means to the aircraft dewar, said mixing valve means being adapted to proportion and mix the warmer and colder liquid so that the liquid ultimately dispensed has a predetermined temperature between the temperatures of said warmer and colder liquid.
Claim 5
Dependent Claim
52 words
The system of claim 1 wherein said means to maintain said storage dewars at different temperatures comprises another storage dewar containing another liquid of lower temperature than said colder liquid, said colder liquid being in thermal equilibrium with said another liquid and said warmer liquid being thermally isolated from said another liquid.
Claim 6
Dependent Claim
22 words
The system of claim 1 wherein said delivery line has a temperature sensing device therein operative to control said mixing valve means.
Claim 7
Dependent Claim
37 words
The system of claim 1 wherein said delivery line has a vent flow control valve therein which, when opened, permits reverse flow of vapor in said delivery line from the aircraft dewar to pre-chill said delivery line.
Claim 8
Dependent Claim
46 words
The system of claim 4 wherein said system has a vent line connection with the vapor space of the aircraft dewar whereby, when there is no residual liquid in the aircraft dewar, liquid flowing in said delivery line into the aircraft dewar pre-chills said delivery line.
Claim 9
Independent Claim
196 words
A system for refilling an aircraft dewar with a volatile liquid for subsequent use in gaseous form, said system comprising a volatile liquid contained within a supply source; a filling sub-system having an inlet for connection with such liquid supply source and an outlet; a saturation sub-system connected to said outlet and having heat exchange means predeterminedly to heat such liquid for saturation thereof; a storage sub-system having at least one storage dewar to receive such liquid from said saturation sub-system, said storage sub-system having means substantially to maintain the predetermined vapor pressure of such saturated liquid while preserving contents of the storage dewar; and a delivery sub-system having delivery line means through which liquid from said storage dewar is dispensed to an aircraft dewar; said filling sub-system having a flow control valve adjacent said outlet, a vent valve upstream of said flow control valve through which such liquid from the supply source flows to prechill said filling sub-system while said flow control valve is closed, and a control unit including a temperature sensing means which opens said flow control valve and closes said vent valve when said filling sub-system has been pre-chilled to desired temperature.
Claim 10
Independent Claim
196 words
A system for refilling an aircraft dewar with a volatile liquid for subsequent use in gaseous form, said system comprising a volatile liquid contained within a supply source; a filling sub-system having an inlet for connection with such liquid supply source and an outlet; a saturation sub-system connected to said outlet and having heat exchange means predeterminedly to heat such liquid for saturation thereof; a storage sub-system having at least one storage dewar to receive such liquid from said saturation sub-system, said storage sub-system having means substantially to maintain the predetermined vapor pressure of such saturated liquid while preserving contents of the storage dewar; and a delivery sub-system having delivery line means through which liquid from said storage dewar is dispensed to an aircraft dewar; said filling sub-system having a flow control valve adjacent said outlet, a vent valve upstream of said flow control valve through which such liquid from the supply source flows to prechill said filling sub-system while said flow control valve is closed, and a control unit including a temperature sensing means which opens said flow control valve and closes said vent valve when said filling sub-system has been pre-chilled to desired temperature.
Claim 11
Dependent Claim
22 words
The system of claim 6 wherein said filling sub-system has a moisture trap and filter assembly therein located upstream of said valves.
Claim 12
Independent Claim
201 words
A system for refilling an aircraft dewar with a volatile liquid for subsequent use in gaseous form, said system comprising a volatile liquid contained within a supply source; a filling sub-system having an inlet for connection with such liquid supply source and an outlet; a saturation sub-system connected to said outlet and having heat exchange means predeterminedly to heat such liquid for saturation thereof; a storage sub-system having at least one storage dewar to receive such liquid from said saturation sub-system, said storage sub-system having means substantially to maintain the predetermined vapor pressure of such saturated liquid while preserving contents of the storage dewar; and a delivery sub-system having delivery line means through which liquid from said storage dewar is dispensed to an aircraft dewar; said saturation sub-system comprising a first conduit means having spray means operative to spray such liquid received directly from said filling sub-system into said storage dewar, and a second conduit means adapted partially to divert liquid flow from said first conduit, said second conduit means having a heat exchanger and a thermally responsive valve means operative to conduct warmed liquid into said storage dewar to elevate the vapor pressure in the latter to a predetermined value.
Claim 13
Independent Claim
201 words
A system for refilling an aircraft dewar with a volatile liquid for subsequent use in gaseous form, said system comprising a volatile liquid contained within a supply source; a filling sub-system having an inlet for connection with such liquid supply source and an outlet; a saturation sub-system connected to said outlet and having heat exchange means predeterminedly to heat such liquid for saturation thereof; a storage sub-system having at least one storage dewar to receive such liquid from said saturation sub-system, said storage sub-system having means substantially to maintain the predetermined vapor pressure of such saturated liquid while preserving contents of the storage dewar; and a delivery sub-system having delivery line means through which liquid from said storage dewar is dispensed to an aircraft dewar; said saturation sub-system comprising a first conduit means having spray means operative to spray such liquid received directly from said filling sub-system into said storage dewar, and a second conduit means adapted partially to divert liquid flow from said first conduit, said second conduit means having a heat exchanger and a thermally responsive valve means operative to conduct warmed liquid into said storage dewar to elevate the vapor pressure in the latter to a predetermined value.
Claim 14
Dependent Claim
40 words
The system of claim 8 wherein said second conduit means conducts the warmed liquid into said storage dewar beneath the liquid level therein, and said first conduit means sprays the liquid into said storage dewar in the vapor space therein.
Claim 15
Independent Claim
238 words
A system for refilling an aircraft dewar with a volatile liquid for subsequent use in gaseous form, said system comprising a volatile liquid contained within a supply source; a filling sub-system having an inlet for connection with such liquid supply source and an outlet; a saturation sub-system connected to said outlet and having heat exchange means predeterminedly to heat such liquid for saturation thereof; a storage sub-system having at least one storage dewar to receive such liquid from said saturation sub-system, said storage sub-system having means substantially to maintain the predetermined vapor pressure of such saturated liquid while preserving contents of the storage dewar; and a delivery sub-system having delivery line means through which liquid from said storagE dewar is dispensed to an aircraft dewar; said storage sub-system comprising, in combination, two storage dewars in fluid communication with each other, one of said dewars being in receiving communication with said saturation sub-system, and means to maintain the liquid in said storage dewars at different temperatures, said receiving dewar liquid being warmer than the liquid in said other dewar and being sufficiently saturated to have a vapor pressure capable of maintaining the other dewar in a filled condition; and mixing valve means in said delivery sub-system to proportion the flow of liquid from the respective storage dewars to deliver such liquid to said delivery line at a desired temperature between the temperatures of the liquid in said storage dewars.
Claim 16
Independent Claim
238 words
A system for refilling an aircraft dewar with a volatile liquid for subsequent use in gaseous form, said system comprising a volatile liquid contained within a supply source; a filling sub-system having an inlet for connection with such liquid supply source and an outlet; a saturation sub-system connected to said outlet and having heat exchange means predeterminedly to heat such liquid for saturation thereof; a storage sub-system having at least one storage dewar to receive such liquid from said saturation sub-system, said storage sub-system having means substantially to maintain the predetermined vapor pressure of such saturated liquid while preserving contents of the storage dewar; and a delivery sub-system having delivery line means through which liquid from said storagE dewar is dispensed to an aircraft dewar; said storage sub-system comprising, in combination, two storage dewars in fluid communication with each other, one of said dewars being in receiving communication with said saturation sub-system, and means to maintain the liquid in said storage dewars at different temperatures, said receiving dewar liquid being warmer than the liquid in said other dewar and being sufficiently saturated to have a vapor pressure capable of maintaining the other dewar in a filled condition; and mixing valve means in said delivery sub-system to proportion the flow of liquid from the respective storage dewars to deliver such liquid to said delivery line at a desired temperature between the temperatures of the liquid in said storage dewars.
Claim 17
Dependent Claim
45 words
The system of claim 10 wherein said storage sub-system comprises another storage dewar containing another liquid of lower temperature than said colder liquid, said colder liquid being in thermal equilibrium with said another liquid and said warmer liquid being thermally isolated from said another liquid.
Claim 18
Dependent Claim
61 words
The system of claim 10 wherein said means to maintain vapor pressure within said storage sub-system comprises a second heat exchanger and a pressure regulator operative to heat liquid from said storage dewar and to return it into the vapor space from said receiving storage dewar to predeterminedly pressurize said storage dewar to compensate for heat loss in said warmer liquid.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |