|Publication number||US3633372 A|
|Publication date||Jan 11, 1972|
|Filing date||Apr 28, 1969|
|Priority date||Apr 28, 1969|
|Also published as||DE2020542A1|
|Publication number||US 3633372 A, US 3633372A, US-A-3633372, US3633372 A, US3633372A|
|Inventors||Kimmel Cleve C, Moll John H|
|Original Assignee||Parker Hannifin Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (61), Classifications (5), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent  Inventors Cleve C. Kimmel Torrance; John H. Moll, Hawthorne, both of Calif.  App1.No. 819,681  Filed Apr. 28, 1969  Patented Jan. 1 1, 1972  Assignee Parker-Hnnnifin Corporation Cleveland, Ohio  TRANSFER OF CRYOGENIC LIQUIDS 9 Claims, 2 Drawing Figs.
 U.S. Cl 62/49, 62/52, 62/55  Int. Cl. Fl7c 7/02  Field of Search 62/45, 55, 49
[5 6] References Cited UNITED STATES PATENTS 2,487,863 11/1949 Garretson 62/54X 2,610,471 9/1952 Thayer 62/55 X 2,964,916 12/1960 Keeping 62/55 X 2,964,918 12/1960 Hansen et al. 62/55 X 2,993,344 7/1961 Reed 62/55 X 3,191,395 6/1965 Maher et a1 62/54 3,260,061 7/1966 Hampton et al. 62/55 X 3,262,280 7/1966 Chaney 62/49 Primary ExaminerAlbert N. Davis, Jr. Att0rney-Oberlin, Maky, Donnelly & Renner ABSTRACT: This invention relates to a system which permits the storage and transfer of cryogenic fluids without losses due to handling and venting and which is characterized by reversed-cascade filling procedure. This system for transfer of a cryogenic liquid from a supply container to a receiver is characterized in that only a single fluid connection is made between the container and receiver without venting the receiver so that the receiver-filling operation may be achieved without gas or liquid loss by evaporation or overflow as by the use ofa submerged and continuously primed pump.
TRANSFER OF CRYOGENIC LIQUIDS BACKGROUND OF THE INVENTION Aircraft are now being equipped with inerting systems for fire and explosion prevention and for fire extinguishment which comprise dewars containing an inert cryogenic liquid such as N for release into fuel tank or other spaces which may contain combustible or explosive liquids or vapors. Accordingly, there is presented the problem of periodic refilling of the aircraft dewars.
ln known transfer equipment, cryogenic liquid is transferred from a supply container to a vented receiver thus resulting insubstantial loss of liquid by evaporation and overflow. Various practices sometimes provide complex transfer equipment such as an auxiliary tank and pump between the supply containers and the receiver, a vapor bleed-off mechanism, and several fluid interconnecting lines to effect transfer.
SUMMARY OF THE INVENTION Contrary to the foregoing, the transfer of cryogenic liquids herein from a ground supply dewar to an aircraft dewar involves only the connection of a flexible supply hose from the supply dewar to the disconnect coupling of the aircraft dewar, the latter as aforesaid, being the inert gas supply source for the aircraft inerting system.
One object of the present invention is to provide for cryogenic liquid transfer from a supply dewar to an aircraft dewar without venting of the latter and without overflow, whereby there is no evaporation loss of the liquid nor is there any possibility, in the case of liquid N of erosive or other damage to concrete pavement and the like due to overflow.
Another object of this invention is to provide for a transfer of cryogenic liquids, such as N which entails the use of but a single fluid line connection between the supply dewar and the aircraft dewar, the supply dewar cart or trailer having the necessary control equipment to obtain desired automatic filling of the aircraft dewar with cryogenic liquid at predetermined saturated vapor pressure and to predetermined level.
Another object of this invention is to provide for the transfer of cryogenic liquids which utilizes a pump means between the supply dewar and the aircraft dewar, and an intervening heat exchanger which assures filling of the aircraft dewar to a predetermined-saturation level for most effective use in inerting the fuel tank and other spaces of an aircraft.
Other objects and advantages of the present invention will become apparent as the following description proceeds.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a schematic drawing of a preferred embodiment of the invention wherein an aircraft dewar is supplied with cryogenic liquid from a portable supply dewar; and
FIG. 2 is a similar schematic drawing illustrating a modification wherein a heat exchanger in an emergency application is substituted for the pump means of FIG. 1 to discharge liquid from the supply dewar.
DISCUSSION OF THE INVENTION Referring to FIG. 1, the ground supply unit 1 may constitute a cart or trailer which carries thereon a supply container 2, i.e., a vacuum-insulated, double-wall dewar, a centrifugal pump 3, a heat exchanger 4, valves 5, 6, and 7, a thermal sensor unit 8, and an operating unit 9.
The outlet of the supply dewar 2 is connected to the inlet of pump 3 by conduit and the outlet of said pump 3 is connected to the disconnect coupling 11 by conduit 12 via the check valve 13, the control valve 5, the mixing valve 7, and the thermal sensor unit 8. A bypass conduit 14 has therein the heat exchanger 4 and the control valve 6 whereby a portion of the pump discharge may be heated as hereinafter described in detail.
The airplane 15 has therein an aircraft dewar 16 having an outlet conduit 17 leading to the inerting system via a shutoff valve 18. A filling conduit 19 leads from the disconnect coupling 11 to a spray device 21 disposed within said dewar l6 and above the filling level switch 23 which has its electrical lead 24 plugged into a socket element 25 in the lead 26 of the operating unit 9. A relief valve 27 in conduit 19 is set to relieve vapor pressure in aircraft dewar 16 exceeding a predetermined maximum. When the dewar 16 is to be filled a flexible hose 28, preferably of vacuum evacuated, double-wall construction, is connected to the disconnect coupling 11.
In normal operation the saturated vapor pressure in the aircraft dewar 16 operates at a predetermined level that is greater than the saturated vapor pressure in the supply dewar 2. In the event that the pressure in dewar 16 is higher than the predetermined level, this pressure must be reduced.
To fill the dewar 16, the flexible hose 28 is connected to the disconnect coupling 11 and the socket 25 is plugged into lead 24 of the level switch 23. The operating unit 9 is then actuated to the "fill position to open control valve 5. If the pressure in the aircraft dewar 16 is higher than predetermined, control valve 29 is opened to allow the pressure to decrease. The operating unit 9 is provided with a pressure-actuated interlock 30 arranged to turn on the pump drive motor 31 when the pressure in the aircraft dewar 16 has reached the predetermined level, and when the pump 3 is driven it draws liquid from the supply dewar 2 and pumps it through the conduit 12, valves 5 and 7, thermal sensor unit 8, hose 28, and conduit 19 into the vapor space of the aircraft dewar l6. Initially, the conduit 12 and hose 28 between the supply dewar 2 and aircraft dewar 16 is somewhat warm and heat will be transferred to the liquid as it flows to the dewar 16. This causes the gas pressure in the space of the dewar 16 to start to increase at the time that the pump 3 is started. However, this flow action is followed by some liquid carried along with the gas and the two phase mixture enters the dewar 16 through the spray device 21 whereby the amount of gas initially introduced is rechilled by the cold walls of the dewar 16 and by the vapor therein.
The pressure increase at startup peaks out just below the relief pressure of the relief valve 27 and at this point liquid droplets start to enter the dewar 16 to cause a pressure collapse of the vapor therein. The pressure decay continues and when it drops below the predetermined saturated level as pressure or temperature sensed by the thermal sensor unit 8, the latter is activated to position the control valves 5 and 6 so that some of the liquid delivered by the pump 3 is conducted through the heat exchanger 4, whereby the heated liquid passes through the control valve 6 to mix in the mixing valve 7 with the liquid passing through the other control valve 5. The filling rate is preferably such that the thermal heat gain in the liquid between the thermal sensor unit 8 and the dewar 16 is insignificant so that the sensor unit 8 constitutes a fairly accurate measurement of temperature of the liquid flowing into the dewar 16. Generally, the allowable range of saturation control of the liquid is wide enough so that additional controls are not required. However, should the range be relatively small such as, say, 5 p.s.i., the thermal sensor unit 8 may be installed in or adjacent the dewar 16 in which case, the signal to the control valves 5 and 6 constitutes a signal indicating the precise temperature in or adjacent the dewar 16.
When the level of the cryogenic liquid in the dewar reaches the level switch 23, the indicating light 32 is turned on, and the pump drive motor 31 is deenergized and the control valves 5 and 6 are closed, whereby no further liquid is supplied from the supply dewar 2 to the aircraft dewar 16. At that time, the operating unit 9 may be shifted from fill to stop and the electric plug-in and fluid disconnect couplings 25 and 11 may be separated, and as evident, the disconnect coupling 11 may be provided with self-sealing valve units to prevent escape of vapor or liquid.
As shown in FIG. 2, if the ground supply unit 1 is not provided with a pump 3, discharging pressure on the liquid in the supply dewar 33 may be generated by opening solenoid valve 34 for flow of liquid through a pressure build up coil 35 into the top of the supply dewar 33 so that the increased vapor pressure on the liquid constitutes a pump means for forcing the liquid through the common discharge conduit 12. This method, of course, decreases the thermal efficiencies of the system when used in continuous operation.
As evident from the foregoing, there is but a single fluid line connection 28 between the ground supply cart 1 and the aircraft dewar 16 through which the latter is filled to a predetermined level as controlled by the level switch 23 and to predetermined saturation level as determined by the thermal sensor unit 8 whereby the saturated vapor pressure in the dewar 16 will be at a predetermined magnitude.
When the aircraft dewar 16 has thus been filled, the supply hose 28 and electrical lead 26 may be disconnected from the aircraft and the aircraft is ready for takeoff. The pressurization of the fuel by N and the supply of N for other uses on the aircraft is not restricted or impaired by the servicing.
We, therefore, particularly point out and distinctly claim as our invention:
1. A system for transfer of a cryogenic liquid from a closed supply container into a closed receiver adapted to contain residual liquid therein at a temperature greater than that of the liquid in said container; conduit means between said container and receiver through which liquid from said supply container is introduced into said receiver; means establishing a pressure differential between said container and the vapor space of said receiver to effect flow of liquid from said container into said receiver without venting of the latter; and temperature control means in said conduit means operative to maintain the vapor pressure at a predetermined level in said receiver which is greater than the saturated vapor pressure of the liquid in said container.
2. The system of claim 1 wherein said means establishing a pressure differential comprises a pump in said conduit means to establish a pressure differential for flow of liquid from said container into said receiver.
3. The system of claim 1 wherein said means establishing a pressure differential comprises a pump and drive means therefor; wherein valve means between said supply container and the portion of said conduit means downstream of said pump opens communication between said supply container and receiver in response to vapor pressure in the latter exceeding a predetermined value thus to decrease such vapor pressure; and wherein a pressure actuated interlock energizes said drive means in response to decrease of such vapor pressure to predetermined value thus to drive said pump for flow of liquid from said container into said receiver.
4. The system of claim 1 wherein said temperature control means comprises a heat exchanger and a sensor unit therefor through which liquid may be conducted to increase the saturated vapor pressure in said receiver to predetermined level.
5. The system of claim 1 wherein said temperature control means comprises a thermal sensor unit; a heat exchanger; and valve means operative to divert a portion of the liquid flowing in said conduit means through said heat exchanger for heating thereof and for mixing of the heated liquid with the unheated portion of the liquid; said sensor unit actuating said valve means upon decrease of vapor pressure in said receiver below a predetermined value.
6. The system of claim 1 wherein said means establishing a pressure difi'erential comprises a heat exchanger through which a portion of the liquid from said supply container is conducted and supplied therefrom to the vapor space of said supply container thus to effect flow of liquid from said supply container into said receiver.
7. The system of claim 1 wherein said conduit means terminates in spray means operative to break up liquid as it enters the vapor space of said receiver.
8. The system of claim 1 wherein relief valve means exposed to vapor pressure in said receiver relieves vapor pressure in said receiver when it exceeds a maximum pressure greater than said predetermined level.
9. The system of claim 2 wherein check valve means in said conduit rneans downstream of said ump prevents reverse flow of liquid in said conduit means rom said receiver into said supply container.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2487863 *||Jul 1, 1946||Nov 15, 1949||Phillips Petroleum Co||Tank car unloading system|
|US2610471 *||Aug 28, 1947||Sep 16, 1952||Union Carbide & Carbon Corp||Process of and apparatus for metering a liquefied gas|
|US2964916 *||Oct 10, 1958||Dec 20, 1960||British Oxygen Co Ltd||Production of inert atmospheres in storage vessels, fuel tanks and the like|
|US2964918 *||Mar 11, 1957||Dec 20, 1960||Union Carbide Corp||Method and apparatus for dispensing gas material|
|US2993344 *||Nov 6, 1958||Jul 25, 1961||Phillips Petroleum Co||Lpg transport loading|
|US3191395 *||Jul 31, 1963||Jun 29, 1965||Chicago Bridge & Iron Co||Apparatus for storing liquefied gas near atmospheric pressure|
|US3260061 *||Dec 16, 1964||Jul 12, 1966||Lox Equip||Flow system for cryogenic materials|
|US3262280 *||Oct 26, 1964||Jul 26, 1966||Chaney Ray L||Level control for cryogenic liquid|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3933030 *||Sep 9, 1974||Jan 20, 1976||Exxon Research And Engineering Company||System for continuous monitoring of the density of cryogenic liquids via dielectric constant measurements|
|US3938347 *||Apr 12, 1974||Feb 17, 1976||Optical Coating Laboratory, Inc.||Level control apparatus and method for cryogenic liquids|
|US3946572 *||Sep 26, 1974||Mar 30, 1976||Parker-Hannifin Corporation||Apparatus for transferring cryogenic liquid from one dewar to another|
|US4175395 *||Dec 20, 1977||Nov 27, 1979||L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude||Distribution of gas under pressure|
|US4192147 *||Jun 30, 1978||Mar 11, 1980||L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude||Arrangements for the controlled injection of cryogenic fluid|
|US4348873 *||Jun 23, 1981||Sep 14, 1982||Kabushiki Kaisha Kurio-Medikaru||Apparatus for refrigeration treatment|
|US4412538 *||Jul 31, 1981||Nov 1, 1983||Kabushiki Kaisha Kurio-Medikaru||Apparatus for refrigeration treatment|
|US4592205 *||Jan 14, 1985||Jun 3, 1986||Mg Industries||Low pressure cryogenic liquid delivery system|
|US4662181 *||Dec 24, 1984||May 5, 1987||Zwich Energy Research Organization, Inc.||Method and apparatus for extending the duration of operation of a cryogenic pumping system|
|US4716738 *||Aug 4, 1986||Jan 5, 1988||Cv International, Inc.||Apparatus and method for delivering cryogenic liquid from a supply vessel to receiver vessels|
|US4932214 *||Dec 2, 1988||Jun 12, 1990||Deutsche Forsehungs- und Versuchsanslalt fuer Luft- und Raumfahrt e.v.||Processing system for liquid hydrogen|
|US5329777 *||Jun 24, 1993||Jul 19, 1994||The Boc Group, Inc.||Cryogenic storage and delivery method and apparatus|
|US5373702 *||Jul 12, 1993||Dec 20, 1994||Minnesota Valley Engineering, Inc.||LNG delivery system|
|US5465583 *||Aug 18, 1993||Nov 14, 1995||Hydra Rig, Inc.||Liquid methane fueling facility|
|US5477690 *||Aug 22, 1994||Dec 26, 1995||Process Systems International, Inc.||Liquid cryogenic storage tank system|
|US5548962 *||Mar 1, 1995||Aug 27, 1996||Daimler-Benz Aerospace Ag||Refueling process for cryogenic liquids|
|US5551488 *||May 25, 1995||Sep 3, 1996||Process System International, Inc.||Method of filling a two-compartments storage tank with cryogenic fluid|
|US5582016 *||Jun 2, 1995||Dec 10, 1996||Aerospace Design & Development, Inc.||Conditioning and loading apparatus and method for gas storage at cryogenic temperature and supercritical pressure|
|US5682750 *||Mar 29, 1996||Nov 4, 1997||Mve Inc.||Self-contained liquid natural gas filling station|
|US5787940 *||May 8, 1996||Aug 4, 1998||Process Systems International, Inc.||Cryogenic fluid system and method of pumping cryogenic fluid|
|US5950437 *||Mar 11, 1998||Sep 14, 1999||Mve, Inc.||System and method for charging insulated containers with cryogenic liquids|
|US6125637 *||Dec 16, 1998||Oct 3, 2000||Bechtel Bwxt Idaho, Llc||Systems for delivering liquified natural gas to an engine|
|US6354088||Oct 13, 2000||Mar 12, 2002||Chart Inc.||System and method for dispensing cryogenic liquids|
|US6631615||Oct 31, 2001||Oct 14, 2003||Chart Inc.||Storage pressure and heat management system for bulk transfers of cryogenic liquids|
|US6923007 *||Oct 16, 2003||Aug 2, 2005||Daniel D. Holt||System and method of pumping liquified gas|
|US7044113||Apr 13, 2005||May 16, 2006||Battelle Energy Alliance, Llc||Systems for delivering liquified gas to an engine|
|US7131278 *||Oct 12, 2004||Nov 7, 2006||Linde Aktiengesellschaft||Tank cooling system and method for cryogenic liquids|
|US7537244||Feb 23, 2007||May 26, 2009||Parker Hannifin Corporation||Fluid fitting assembly|
|US8624072||May 25, 2012||Jan 7, 2014||Mcalister Technologies, Llc||Chemical reactors with annularly positioned delivery and removal devices, and associated systems and methods|
|US8669014||Feb 11, 2013||Mar 11, 2014||Mcalister Technologies, Llc||Fuel-cell systems operable in multiple modes for variable processing of feedstock materials and associated devices, systems, and methods|
|US8671870||Aug 13, 2012||Mar 18, 2014||Mcalister Technologies, Llc||Systems and methods for extracting and processing gases from submerged sources|
|US8673220||May 25, 2012||Mar 18, 2014||Mcalister Technologies, Llc||Reactors for conducting thermochemical processes with solar heat input, and associated systems and methods|
|US8673509||Aug 13, 2012||Mar 18, 2014||Mcalister Technologies, Llc||Fuel-cell systems operable in multiple modes for variable processing of feedstock materials and associated devices, systems, and methods|
|US8734546||Feb 11, 2013||May 27, 2014||Mcalister Technologies, Llc||Geothermal energization of a non-combustion chemical reactor and associated systems and methods|
|US8771636||Nov 26, 2012||Jul 8, 2014||Mcalister Technologies, Llc||Chemical processes and reactors for efficiently producing hydrogen fuels and structural materials, and associated systems and methods|
|US8821602||Aug 13, 2012||Sep 2, 2014||Mcalister Technologies, Llc||Systems and methods for providing supplemental aqueous thermal energy|
|US8826657||Feb 11, 2013||Sep 9, 2014||Mcallister Technologies, Llc||Systems and methods for providing supplemental aqueous thermal energy|
|US8888408||Feb 11, 2013||Nov 18, 2014||Mcalister Technologies, Llc||Systems and methods for collecting and processing permafrost gases, and for cooling permafrost|
|US8911703||Feb 11, 2013||Dec 16, 2014||Mcalister Technologies, Llc||Reducing and/or harvesting drag energy from transport vehicles, including for chemical reactors, and associated systems and methods|
|US8926719||Mar 13, 2014||Jan 6, 2015||Mcalister Technologies, Llc||Method and apparatus for generating hydrogen from metal|
|US8926908||Nov 26, 2012||Jan 6, 2015||Mcalister Technologies, Llc||Reactor vessels with pressure and heat transfer features for producing hydrogen-based fuels and structural elements, and associated systems and methods|
|US9039327 *||Aug 13, 2012||May 26, 2015||Mcalister Technologies, Llc||Systems and methods for collecting and processing permafrost gases, and for cooling permafrost|
|US9103548||Mar 17, 2014||Aug 11, 2015||Mcalister Technologies, Llc||Reactors for conducting thermochemical processes with solar heat input, and associated systems and methods|
|US9188086||Feb 14, 2011||Nov 17, 2015||Mcalister Technologies, Llc||Coupled thermochemical reactors and engines, and associated systems and methods|
|US9206045||Feb 14, 2011||Dec 8, 2015||Mcalister Technologies, Llc||Reactor vessels with transmissive surfaces for producing hydrogen-based fuels and structural elements, and associated systems and methods|
|US9222704||Apr 11, 2014||Dec 29, 2015||Mcalister Technologies, Llc||Geothermal energization of a non-combustion chemical reactor and associated systems and methods|
|US9302681||Aug 13, 2012||Apr 5, 2016||Mcalister Technologies, Llc||Mobile transport platforms for producing hydrogen and structural materials, and associated systems and methods|
|US9309473||Mar 17, 2014||Apr 12, 2016||Mcalister Technologies, Llc||Systems and methods for extracting and processing gases from submerged sources|
|US20050132719 *||Oct 12, 2004||Jun 23, 2005||Linde Aktiengesellschaft||Tank cooling system and method for cryogenic liquids|
|US20050193990 *||Apr 13, 2005||Sep 8, 2005||Bingham Dennis N.||Systems for delivering liquified gas to an engine|
|US20070181208 *||Feb 6, 2006||Aug 9, 2007||Honeywell International Inc.||System and method for preventing blow-by of liquefied gases|
|US20070194569 *||Feb 23, 2007||Aug 23, 2007||Gibson James D||Fluid fitting assembly|
|US20110200516 *||Aug 18, 2011||Mcalister Technologies, Llc||Reactor vessels with transmissive surfaces for producing hydrogen-based fuels and structural elements, and associated systems and methods|
|US20110203776 *||Aug 25, 2011||Mcalister Technologies, Llc||Thermal transfer device and associated systems and methods|
|US20110206565 *||Aug 25, 2011||Mcalister Technologies, Llc||Chemical reactors with re-radiating surfaces and associated systems and methods|
|US20110220040 *||Sep 15, 2011||Mcalister Technologies, Llc||Coupled thermochemical reactors and engines, and associated systems and methods|
|US20130094909 *||Aug 13, 2012||Apr 18, 2013||Mcalister Technologies, Llc||Systems and methods for collecting and processing permafrost gases, and for cooling permafrost|
|DE102012207577A1||May 8, 2012||Nov 14, 2013||Tge Gas Engineering Gmbh||Abgabevorrichtung für kryogene Flüssigkeiten|
|EP1308667A2 *||Oct 31, 2002||May 7, 2003||Chart, Inc.||Storage pressure and heat management system for bulk transfers of cryogenic liquids|
|EP1342031A1 *||Oct 12, 2001||Sep 10, 2003||Chart Inc.||System and method for dispensing cryogenic liquids|
|WO2013167639A1||May 8, 2013||Nov 14, 2013||Tge Gas Engineering Gmbh||Dispensing device for cryogenic liquids|
|U.S. Classification||62/49.2, 62/50.1|
|Jan 26, 1989||AS||Assignment|
Owner name: PARKER INTANGIBLES INC., A CORP. OF DE, DELAWARE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PARKER-HANNIFIN CORPORATION;REEL/FRAME:005886/0169
Effective date: 19881221