Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3648018 A
Publication typeGrant
Publication dateMar 7, 1972
Filing dateFeb 5, 1970
Priority dateFeb 5, 1970
Publication numberUS 3648018 A, US 3648018A, US-A-3648018, US3648018 A, US3648018A
InventorsCheng Chin Huan, Leonard Donald E
Original AssigneeDow Chemical Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Transfer device for cryogenic fluids
US 3648018 A
Abstract
Disclosed is a device for transferring a cryogenic fluid from its storage vessel to cryostat or other vessel. The device is an open ended tube of sufficient length to permit its lower extremity to project below the surface of the fluid when it is inserted into an opening in the vessel. The tube is fitted with a collar which forms a substantially airtight seal between the tube and the opening. A heater capable of producing sufficient heat to vaporize part of the fluid is attached to the tube. The vaporization creates an internal pressure which forces the fluid up through the tube. By insulating the heater from the tube so that the fluid forced into the tube is not vaporized, a steady flow of cryogenic fluid is delivered to a desired location, e.g., a cryostat.
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

[ Mar. 7, 1972 [54] TRANSFER DEVICE FOR CRYOGENIC FLUIDS [72] Inventors: Chin Huan Cheng, Midland; Donald E.

Leonard, Shepherd, both of Mich.

[731 Assignee: The Dow Chemical Company, Midland,

- Mich.

221 Filed: Feb. 5, 1970 211 App1. No.: 9,004

[58] FieldofSearch ..219/271,272, 275,307,319; 62/50, 51, 55; 137/341; 222/146; 261/142; 417/52 [56] References Cited UNITED STATES PATENTS 3,092,974 6/1963 Haumann et al ..62/50 X Primary Examiner.l. V. Truhe Assistant Examiner-C. L. Albritton Attorney-Griswold 8L Burdick, Jerome l... Jeffers and William R. Norris [5 7] ABSTRACT Disclosed is a device for transferring a cryogenic fluid from its storage vessel to cryostat or other vessel. The device is an open ended tube of sufficient length to permit its lower extremity to project below the surface of the fluid when it is inserted into an opening in the vessel. The tube is fitted with a collar which forms a substantially airtight seal between the tube and the opening. A heater capable of producing sufficient heat to vaporize part of the fluid is attached to the tube. The vaporization creates an internal pressure which forces the fluid up through the tube. By insulating the heater from the tube so that the fluid forced into the tube is not vaporized, a

steady flow of cryogenic fluid is delivered to a desired location, e.g., a cryostat.

4 Claims, 1 Drawing Figure Discharge Patented March 7, 1972 3,648,018

INVENTORS. Chin Huan Che/7g BY Dona/d E. Leona/'0 Arron/v5) TRANSFER DEVICE FOR CRYOGENIC FLUIDS Certain chemical reactions and physical measurements must be run at extremely low temperatures. For example, those chemical reactions which are'highly exothermic must be kept cold to prevent explosions or decomposition of the reactants due to evolution of large amounts of heat energy. The use of dry ice (m.p.-78.5 C.) will not provide sufficient cooling in some instances. Liquified gases, also known as cryogenic fluids, are used in these cases because of their low temperatures. For example, liquid nitrogen (b.p.l95.8 C.), liquid helium (b.p.--268.6 C.) and liquid oxygen (b.p.- 183.0 C.) are useful cryogenic fluids. Liquid nitrogen is espe cially useful in laboratory operations due to its low cost.

These cryogenic fluids are stored in heavily insulated containers to prevent their rapid evaporation, and there is a problem in transferring them from their storage vessels to the area it is desired to cool. The general practice of transferring a cryogenic fluid from its storage vessel is by pressurizing the vessel with gas to force the liquid out through a transfer tube into a cryostat. Compressed air at several p.s.i. is generally used to transfer liquid nitrogen. A simpler way to pressurize the vessel is to introduce heat energy into it to evaporate the liquid itself. The advantages of this method are less chance of contamination and greater convenience.

Accordingly, it would be desirable and it is an object of the present invention to provide a novel device for transferring a cryogenic fluid, i.e., liquid, from its storage vessel to a cryostat.

An additional object is to provide such a device which is simple to operate and does not require an external gas supply.

A further object is to provide such a device which requires only small amounts of heat energy in order to effectively transport the fluid.

Another object is to provide such a device which produces a continuous, uniform transfer of cryogenic fluid from its storage vessel to a cryostat.

One embodiment of the invention is illustrated by the FIGURE.

An open ended tube 13 is provided with a collar 14 to snugly fit the opening in the storage vessel. Optionally, the opening in the storage vessel is fitted with a rubber hose 15. The hose allows for a better seal between the collar and the opening but is by no means critical to the operability of the device. The tube is fitted with an electrical resistance heater 16 which is separated from the tube by sufficient insulation 17 to prevent fluid which enters the tube from being vaporized. Vaporization of a substantial amount of fluid in the tube is prevented since it is desired to evenly dispense liquid rather than a liquid gas mixture. The heater is connected to a power source 18.

The figure illustrates the device inserted into a storage vessel for cryogenic fluid in an operable manner. The tube is of sufficient length to protrude below the level of the liquid. Preferably, it extends close to the bottom of the vessel so as to dispense liquid even when the vessel is nearly empty.

In operation the heater is operated so as to vaporize enough of the cryogenic fluid to create an internal pressure sufficient to force fluid up through the tube. vaporization of the fluid in the tube could be prevented by physical separation of the tube and heater; however, insulating the heater from the tube with a coating which does not conduct a substantial amount of heat will prevent vaporization and result in a device which can be handled conveniently. That part of the tube which projects from the storage vessel is normally wrapped with insulation 19 to prevent vaporization of the fluid after leaving the storage vessel. Flow of the fluid can be conveniently stopped by turning off the heater and releasing the pressure such as by opening a vent 20 in the collar. The vent should be of such design that it can cause an airtight seal when closed and be readily opened to relieve internal pressure in the vessel.

We claim:

1. A device for removing a cryogenic liquid from a storage vessel which comprises:

a. an open ended tube of sufficient length to permit its lower extremity to project below the surface of the liquid when it is inserted into an opening in the storage vessel,

b. a collar adapted to the tube to form a substantially airtight seal between the tube and the opening, said tube being airtight in the area defined by the surface of the liquid and the collar, and

c. means for producing sufficient heat energy to vaporize the cryogenic liquid in the storage vessel, said means attached to the tube and sufficiently insulated from it to prevent its heat energy from evaporating liquid inside the tube.

2. The device as described in claim 1 wherein the heating means is an electrical resistance heater.

3. The device as described in claim 1 wherein that part of the tube which projects from the storage vessel is sufficiently insulated to prevent vaporization of the liquid after leaving the vessel.

4. The device as described in claim 1 wherein the collar is equipped with a vent which is capable of being sealed or opened.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3092974 *Jul 21, 1960Jun 11, 1963Union Carbide CorpMethod and apparatus for controlled freezing of biologicals
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4566283 *Aug 30, 1984Jan 28, 1986Nicolet Instrument CorporationLow temperature device for cooling small samples
US4608831 *Oct 24, 1984Sep 2, 1986Gustafson Keith WSelf-pressurizing container for cryogenic fluids
US5143450 *Feb 1, 1991Sep 1, 1992Aetrium, Inc.Apparatus for handling devices under varying temperatures
US5169031 *Jul 1, 1991Dec 8, 1992Air Products And Chemicals, Inc.Dispenser for dispensing cryogenic liquid
US5263775 *Aug 26, 1992Nov 23, 1993Aetrium, Inc.Apparatus for handling devices under varying temperatures
US5453256 *Apr 8, 1994Sep 26, 1995Mannesmann AktiengesellschaftCatalytic reactor
US5673562 *Feb 23, 1996Oct 7, 1997L'air Liquide, S.A.Bulk delivery of ultra-high purity gases at high flow rates
US5761911 *Nov 25, 1996Jun 9, 1998American Air Liquide Inc.System and method for controlled delivery of liquified gases
US5937655 *Dec 4, 1997Aug 17, 1999Mve, Inc.Pressure building device for a cryogenic tank
US6071081 *Feb 11, 1993Jun 6, 2000Seiko Instruments Inc.Heat-powered liquid pump
US6076359 *Jul 11, 1997Jun 20, 2000American Air Liquide Inc.System and method for controlled delivery of liquified gases
US6539726 *May 8, 2001Apr 1, 2003R. Kevin GiesyVapor plug for cryogenic storage vessels
US6568415 *Jul 16, 2001May 27, 2003Nippon Shokubai Co., Ltd.Storing device for easily polymerizable and coagulating liquid substance and method for pressure control thereof
US7717143 *Sep 7, 2006May 18, 2010Gm Global Technology Operations, Inc.Heated outlet valve for a hydrogen storage tank
US7918370 *Sep 14, 2007Apr 5, 2011Green Hydrotec Inc.Portable fluid delivering system and kit
DE4326138A1 *Aug 4, 1993Feb 9, 1995Messer Griesheim GmbhApparatus for producing a liquid gas flow under pressure
DE19853531A1 *Nov 20, 1998May 25, 2000Messer Griesheim GmbhVorrichtung zur Entnahme eines unter Druck stehenden flüssigen Gasstromes aus einem Druckbehälter
DE19853531C2 *Nov 20, 1998Jan 25, 2001Messer Griesheim GmbhVorrichtung zur Entnahme eines unter Druck stehenden flüssigen Gasstromes aus einem Druckbehälter
EP0715119A2Nov 9, 1995Jun 5, 1996MESSER GRIESHEIM GmbHProcess for vaporizing liquefied gases at low temperatures
WO1991003679A1 *Sep 5, 1990Mar 21, 1991Hellmuth SitteLiquid nitrogen refilling device
WO2002090821A2 *May 8, 2002Nov 14, 2002Cryoport Systems LlcImproved vapor plug for cryogenic storage vessels
Classifications
U.S. Classification392/394, 392/403, 62/48.1, 417/52, 137/341, 222/146.2
International ClassificationF17C9/00
Cooperative ClassificationF17C2225/047, F17C2223/047, F17C2221/011, F17C2223/0161, F17C2221/014, F17C2221/017, F17C9/00
European ClassificationF17C9/00