WO2013066430A1 - Système et procédé permettant de charger et de sceller des récipients sous pression - Google Patents

Système et procédé permettant de charger et de sceller des récipients sous pression Download PDF

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Publication number
WO2013066430A1
WO2013066430A1 PCT/US2012/045914 US2012045914W WO2013066430A1 WO 2013066430 A1 WO2013066430 A1 WO 2013066430A1 US 2012045914 W US2012045914 W US 2012045914W WO 2013066430 A1 WO2013066430 A1 WO 2013066430A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
boss
passage
opening
seal
Prior art date
Application number
PCT/US2012/045914
Other languages
English (en)
Inventor
Paul M. Lyons
Christopher E. PENTLAND
Original Assignee
Raytheon Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Raytheon Company filed Critical Raytheon Company
Priority to JP2014539930A priority Critical patent/JP2014532849A/ja
Priority to EP12741156.9A priority patent/EP2773898B1/fr
Publication of WO2013066430A1 publication Critical patent/WO2013066430A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/06—Closures, e.g. cap, breakable member

Definitions

  • This invention is directed to a pressure or vacuum container, and more particularly to a high pressure gas container having an improved seal for extended shelf life.
  • High pressure gas containers find many uses, including in guided missiles.
  • the pressurized gas provides a compact source of energy that can be used, for example, for uncaging gyros, cooling detector elements of infrared seekers, moving control surfaces, etc.
  • These containers can be very small, making them difficult to fill and seal while maintaining a low leak rate.
  • One commonly used fill method involves a small diameter tube which breaches the inner volume of the bottle. After the container is filled with gas through the tube, it is resistance welded in several places and then welded shut at its distal end. This general design has been in use for more than 20 years throughout the industry.
  • Metal-to-metal seals can be imperfect, allowing the confined gas to slowly leak out of the container, shortening its shelf life. Since guided missiles are often stored for a long time before they are used, the potential of a shortened shelf life increases the risk that the container will not contain sufficient gas when it is needed, which can render the missile useless. Additionally, preceding seals were often not physically robust to mishandling, were not robust to environmental conditions, and/or were not robust to contamination. Despite these shortcomings, they continued to be used because other techniques were unavailable, did not fit into the available volume, or were more expensive and therefore not suitable for typical qualities of missile subsystems.
  • the present invention provides a redundant sealing system that uses both a deformable plug to fill the opening and form an initial seal and a secondary welded seal that can be formed with the addition of a metal cap and an
  • the present invention provides a seal assembly for a pressure container, where the container has a fill port opening and a boss extending from a surface of the container.
  • the boss has a passage aligned with the opening, and the passage has a threaded portion.
  • the seal assembly includes a port plug having a nose portion with a surface shaped to mate with the fill port opening in the container and a set screw portion with external threads for engaging the threaded portion of the passage through the boss to press the nose portion into the fill port opening to form a seal.
  • the seal is an initial or first seal and the seal assembly further includes a weld plug, sized to close the distal end of the passage through the boss. The weld plug is welded to the boss to form a second seal.
  • the present invention also provides a pressurized container having such a seal assembly for sealing the opening and the passage.
  • the present invention also provides a method of charging a container and then sealing the container to provide an extended shelf life.
  • the method includes the following steps: (a) providing a container having an opening therein and a boss extending from a surface of the container adjacent the opening, the boss having a passage aligned with the opening in the container, the passage being at least partially threaded with internal threads, a port plug that includes a nose portion for closing the fill port opening in the container and a set screw portion with external threads for engaging the threaded portion of the boss; (b) inserting the port plug in the passage with the nose portion closer to the opening than the set screw portion; (c) charging the container via the passage; (d) torquing the threaded port plug to advance the port plug in the passage until the nose portion engages the surface of the container adjacent the opening to create the initial or first seal; (e) installing a weld plug into an outer end of the boss to close the passage through the boss; and (f) welding the weld plug to the boss to create a second
  • the invention provides a container with a seal assembly, where the container has an opening therein and a boss extending from a surface of the container adjacent the opening.
  • the boss has a passage aligned with the opening in the container, and the passage is at least partially threaded with internal threads.
  • the container and seal assembly further include means for sealing the opening in the container, adjacent the opening at a proximal end of the passage through the boss, and means for sealing the passage through the boss, adjacent a distal end of the passage through the boss.
  • the opening-sealing means includes a port plug having a nose portion with a surface shaped to mate with the fill port opening in the container and a set screw portion with external threads for engaging the threaded portion of the passage through the boss to press the nose portion into the fill port opening to form a seal.
  • the passage-sealing means includes a weld plug sized to close the distal end of the passage, the weld plug being welded to the boss to form a second seal.
  • FIG. 1 is an exploded perspective view of a container provided in accordance with the present invention illustrating the sealing components.
  • FIG. 2 is a cross-sectional view of the completed assembly of the components shown in FIG. 1 .
  • FIG. 3 is a perspective view of the port plug as shown in FIG. 1 .
  • FIG. 4 is a cross-sectional view of the port plug of FIG. 3.
  • FIG. 5 is a perspective view of a weld plug as shown in FIG. 1 .
  • FIGS. 6-10 are sequential views of the port assembly and sealing mechanisms for the container as shown in FIG. 2 illustrating the assembly and use process.
  • FIGS. 1 1 -15 illustrate alternative embodiments of a weld plug provided in accordance with the present invention.
  • FIG. 16 illustrates an alternative port plug provided in accordance with the present invention.
  • prior pressure containers suffered from a number of problems in providing a hermetic seal. For example, some containers were not robust to mishandling, environmental conditions, or contamination, or the sealing method required a high capital cost to implement. In addition, previous sealing methods for pressure containers often leak excessively over time, were not compact and occupied a large volume, or provided no redundancy in the sealing method.
  • the present invention provides a compact, inexpensive, and redundant sealing method.
  • the pressure container includes an opening for filling with a pressurized gas or liquid.
  • a first element is pressed against an annular surface adjacent the opening and fills and closes the opening itself. In the process, this first element deforms to mate with the annular surface and provide an initial or a first seal.
  • a second element holds the first element against the container and is removable to release or replace the first element in the event that this initial seal is ineffective or otherwise compromised.
  • a third element is then mounted over the first and second elements and welded in-place to provide a second seal in the event that the initial seal is breached.
  • the resulting pressure container is physically small, uses common manufacturing methods, and provides a robust, redundant seal that can be made in the field. Factory conditions are not required to establish either the first seal or the second seal. Moreover, the first seal can be tested before creating the second seal and if the initial first seal fails, the first seal can be reworked before the second seal is applied.
  • the container 10, or tank or bottle or other chamber capable of retaining a gas or a liquid, has a fill port opening 14 and a boss 16 extending from a surface of the container 10.
  • the fill port opening 14 preferably is cleaning friendly.
  • the boss 16 has a passage 20 aligned with the opening 14, and the passage 20 and the opening 14 are sealed by the seal assembly 12.
  • An exemplary container 10 is made of steel, such as stainless steel, and has a wall thickness of approximately 0.07 inches (about 1 .8 mm).
  • An exemplary stainless steel for the container is Carpenter Custom 455 stainless steel, from Carpenter Technology Corporation of Wyomising, Pennsylvania, U.S. Such a container has been found to withstand high internal pressures, up to
  • the boss 16 is in effect a short, permanent tube secured to or formed as an integral part of the container 10.
  • An exemplary boss 16 is cylindrical and has a diameter of approximately 0.25 inches (about 6.4 mm) and a length or height of about 0.30 (about 7.6 mm) in length.
  • the passage 20 through the boss 16 to the fill port opening 14 has a threaded portion 22 at a distal end 24 thereof for receiving a port plug 26.
  • the illustrated port plug 26 has a nose portion 30 and a set screw portion 32.
  • the nose portion 30 and the set screw portion 32 are separate components, but they could be formed as a single part.
  • the nose portion 30 can be made of a malleable material, such as a plastic or a metal, and in the illustrated embodiment the nose-portion 30 has a generally cone-like shape. Other shapes can work as well.
  • An exemplary nose portion 30 is made of brass, such as brass 360.
  • the illustrated nose portion 30 also has a support post or shank 34 extending from a base or distal end of the cone-like shape.
  • the support post 34 extends into a socket 36 in the set screw portion 32.
  • the support post 34 preferably, but not necessarily, is partially crushed or swaged to permanently capture the nose portion 30 in the set screw portion 32 of the port plug 26. This enables the nose portion 30 to move in the radial direction relative to the set screw portion 32 for self alignment when secured against the annular surface on the container 10.
  • the set screw portion 32 has external threads 40 for engaging the threaded portion 22 on the inner surface of the passage 20 through the boss 16.
  • a proximal end 42 of the set screw portion 32 includes a socket 44 for receiving the support post 34 at the base of the nose portion 30.
  • This hollowed-out set screw portion 32 can facilitate swaging the support post 34 portion of the nose portion 30 (FIG. 15), so that it mushrooms to an increased width and thus is held behind a shoulder 47 in the set screw portion 32.
  • An example of a port plug 26 with a swaged support post 34 is shown in FIG. 16.
  • a distal end 46 of the set screw portion 32 includes a driving feature 50 for engaging and driving the set screw portion 32 along the threaded portion 22 of the passage 20 through the boss 16.
  • a driving feature 50 includes a hexagonal socket formed in a distal end of the set screw portion 32.
  • An exemplary socket 50 is sized to receive a nominal 1/16 inch (approximately 1 .6 mm) hexagonal wrench or key.
  • Other types of driving features, such as for receiving a screwdriver are alternative options.
  • An exemplary set screw portion 32 is made of stainless steel and, more particularly, Nitronic ® 60, available from AK Steel Corporation of West Chester, Ohio, United States. Nitronic ® 60 is an austenitic stainless steel.
  • the illustrated set screw portion 32 is tubular, and the socket 36 is formed by a hole or passage that extends part or all the way through the set screw portion 32, facilitating the delivery of pressurized gas to the container 10 when the port plug 26 is in the passage 20 in the boss 16.
  • a slot 48 in the side of the set screw portion 26 provides another path for gas to flow past the set screw portion 26 and into the container 10.
  • the nose portion 30 is made of a malleable material, continuing to torque the set screw portion 32 deforms the nose portion 30 to mate with that surface adjacent the fill port opening 14, as shown in FIG. 2. This creates an initial seal. This initial seal is reworkable if testing reveals that the seal is leaking. This arrangement also places the threads on the set screw portion 32 of the port plug 26 and the passage 20 in the boss 16 outside the sealed container, on the dirty side of the first seal.
  • a weld plug 60 is placed over the distal end 24 of the boss 16 and welded in place to provide a second seal, redundant to the first seal. Because the port plug 26 is entirely within the passage 20 through the boss 16, the weld plug 60 and the boss 16 form a hermetically-sealed chamber over both the port plug 26 and the fill port opening 14. So even if the port plug seal fails, the container 10 will remain sealed by the weld plug 60 and the weld holding it in place.
  • the weld plug 60 typically is made of steel, such as the same steel as the pressure container 10.
  • An exemplary weld plug is approximately 0.060 inches (about 1 .5 mm) thick.
  • the weld can be formed with an orbital TIG welder, for example. Such welders are commonly available, generally are small, portable, simple to use, and relatively inexpensive. More importantly, they yield consistent-quality welds with simple operation.
  • orbital welders can be used in the field and do not require the precise conditions of a factory environment to form the weld seal.
  • Other types of welding devices can be used to weld the weld plug 60 to the boss 16, however, including laser and electron-beam welders.
  • the weld plug 60 can include a shank or shaft 62 that is received in the port plug 26 and extends through the socket 36 in the set screw portion 32 of the port plug 26.
  • the illustrated port plug 60 has a hexagonal shaft 62 that is received in the hexagonal socket 50 in the distal end of the set screw portion 32.
  • FIGS. 6-10 A sequence of operation of a sealing method provided in accordance with the present invention is shown in FIGS. 6-10.
  • FIG. 6 illustrates a pressure container 10 and the boss 16 extending from the pressure container 10 with the passage therethrough to the fill port opening 14.
  • the port plug 26 is inserted into the passage 20 in the boss 16. This can be done manually or automatically.
  • the pressure container 10 can then be mounted into a fixture or otherwise connected or coupled to a fitting to fill the pressure tank with a pressurized gas or liquid 66 (or alternatively evacuating fluid from the container 10).
  • the pressure container 10 has been removed from the fixture or coupling and a weld plug 60 is installed at the distal end 24 of the passage 20 through the boss 16.
  • the container 10 and seal assembly 12 can then be installed into an orbital welder and the weld plug 60 is welded to the boss 16 to complete the second, redundant seal for the container 10.
  • the weld plug 72 may include a threaded portion 74 for engaging the threaded portion 22 in the passage 20 to secure the weld plug 72 in place before it is welded.
  • the weld plug 72 also includes a means for torqueing the weld plug 72 into the passage 20, such as by a hexagonal socket 76.
  • a distal end of the weld plug 72 is again provided with an axial weld to secure the weld plug 72 in place.
  • the weld plug 72 may extend into the passage 20 a sufficient distance to engage the distal end 46 of the set screw portion 32 of the port plug 26 and thus prevent the port plug 26 from loosening due to vibration or handling of the pressure container 10.
  • the weld plug may be provided with a radial weld, as was the case with the embodiments previously shown in FIGS. 1 and 10.
  • the embodiment shown in FIG. 13 is similar to that shown in FIG. 10, and like FIG. 1 1 the weld plug 80 is only held in place by the fit of a proximal portion 82 of the weld plug 80 that extends into the passage 20 through the boss 16.
  • the weld plug 80 in this case is primarily held in place by the weld itself.
  • Another embodiment, comparable to that of FIG. 12, has a threaded portion 84 that extends into the passage 20 to secure the weld plug 86 in place until it is welded. In contrast to FIG. 12, however, in this case the weld plug 86 extends beyond the distal end 24 of the boss 16 and is held in place with a radial weld.
  • the weld plug designs shown in FIGS. 12 and 14 included a threaded portion that extended into the passage 20 through the boss 16. Since the passage 20 is already threaded at its distal end 24 to receive the set screw portion 32 of the port plug 26 these designs require no additional machining.
  • An alternative is shown in FIG. 15.
  • the port plug 90 extends over an outer surface 92 of the boss 16 and is radially welded to the outer surface.
  • This design also includes an exterior thread on the boss 16 that engages an interior threaded portion 96 on the port plug 90, similar to a screw-cap for a bottle. These threaded portions 94 and 96 may be omitted, however, and the weld plug 90 or cap can be welded in place without a threaded connection.
  • weld plugs for closing the passage through the boss and sealing the port plug in the passage are contemplated within the scope of the present invention.
  • the weld may be an axial weld, a radial weld, or a combination of the two, in the form of a weld at an angle, such as between parts meeting at a 45 degree angle relative to an axis of the boss 16.
  • the welds used to seal the weld plug to the boss can be made using other methods than an orbital TIG welder, such as a laser, electron-beam, or other welding technique.
  • the present invention provides a redundant seal for a high pressure gas container 10.
  • First a port plug 26 seats and then deforms a nose 30 portion adjacent a surface surrounding a fill port opening 14 to establish a first seal.
  • the set screw portion 32 both advances the nose portion 30 against the opening 14 and holds the deformed nose 30 in place.
  • a weld plug 60 then caps or covers the port plug 26 and the passage 20 through the boss 16 and is welded in place to provide a second seal for any gas that might escape past the port plug 26.
  • the present invention allows the first sealing elements, the port plug 26 and particularly the nose portion 30, to be reworked or replaced if the first seal is tested and fails the test, before the weld plug 60 is added to form the second seal.
  • An exemplary seal assembly provided by the invention has been found to seal over 40,000 psig (about 276,000 kPa) prior to burst.
  • the resulting seal assembly 12 is robust to mishandling, the first seal is protected from environmental conditions and contamination, and the first and second seals can be formed with inexpensive tools that can be used outside a factory setting, in the field. For example, in an air-conditioning maintenance and repair situation, as well as for supplying gas for a missile.
  • Such an exemplary seal assembly is expected to have an approximately 14 year life, at least, with no more than 200 psig (about 1 ,400 kPa) leak over that 14 year period.
  • a seal assembly 12 for a pressurized container 10 the container 10 having a fill port opening 14 and a boss 16 extending from a surface of the container 10, the boss 16 having a passage 20 aligned with the opening 14, the passage 20 having a threaded portion 22, the seal assembly 12 comprising a port plug 26 having a nose portion 30 with a surface shaped to mate with the fill port opening 14 in the container 10 and a set screw portion 32 with external threads for engaging the threaded portion 22 of the passage 20 through the boss 16 to press the nose portion 30 into the fill port opening 14 to form a seal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

La présente invention concerne un système de scellement redondant qui comprend un ensemble joint pour un récipient sous vide ou contenant un gaz ou un liquide sous pression, le récipient possédant une ouverture de remplissage et une protubérance s'étendant depuis une surface du récipient. La protubérance possède un passage aligné sur l'ouverture, et le passage possède une partie filetée. L'ensemble joint comprend un bouchon d'orifice possédant une partie nez dotée d'une surface formée pour s'accoupler à l'ouverture de remplissage dans le récipient, et une partie vis de calage possédant des filets externes permettant d'entrer en prise avec la partie filetée du passage à travers la protubérance pour appuyer sur la partie nez dans l'ouverture de remplissage afin de former un premier joint. L'ensemble joint comprend en outre un bouchon à souder dimensionné pour fermer l'extrémité distale du passage à travers la protubérance, le bouchon à souder étant soudé à la protubérance pour former un second joint.
PCT/US2012/045914 2011-11-04 2012-07-09 Système et procédé permettant de charger et de sceller des récipients sous pression WO2013066430A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2014539930A JP2014532849A (ja) 2011-11-04 2012-07-09 圧力容器を満たしてシールするシステム及び方法
EP12741156.9A EP2773898B1 (fr) 2011-11-04 2012-07-09 Système et procédé permettant de charger et de sceller des récipients sous pression

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/289,400 2011-11-04
US13/289,400 US20130112691A1 (en) 2011-11-04 2011-11-04 System and method for charging and sealing pressure vessels

Publications (1)

Publication Number Publication Date
WO2013066430A1 true WO2013066430A1 (fr) 2013-05-10

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Family Applications (1)

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PCT/US2012/045914 WO2013066430A1 (fr) 2011-11-04 2012-07-09 Système et procédé permettant de charger et de sceller des récipients sous pression

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US (1) US20130112691A1 (fr)
EP (1) EP2773898B1 (fr)
JP (1) JP2014532849A (fr)
WO (1) WO2013066430A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL3054454T3 (pl) 2011-06-02 2020-07-27 Australian Nuclear Science & Technology Organisation Pojemnik przechowujący do przechowywania niebezpiecznego materiału odpadowego
JP6781892B2 (ja) * 2016-02-12 2020-11-11 株式会社日本製鋼所 蓄圧容器
US11313516B2 (en) 2018-08-24 2022-04-26 Bellowstech, Llc Charging port for pressure vessel
FR3119008B3 (fr) * 2021-01-15 2022-12-16 Air Liquide Dispositif de stockage de fluide sous pression, appareil et procédé de remplissage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6810730U (de) * 1968-03-04 1971-06-03 Nat Forge Co Hochdruckgefaess.
US5832947A (en) * 1997-01-17 1998-11-10 Niemczyk; Andrew Gas shut-off and pressure relief valve for a high pressure gas vessel
WO2003089823A1 (fr) * 2002-04-19 2003-10-30 Western Valve Procede et appareil pour un dispositif d'echappement orbital et soude destine a une bouteille de gaz comprime
US20080178938A1 (en) * 2007-01-30 2008-07-31 Fike Corporation Rupture disc assembly that withstands much higher back pressures than actuation pressure
WO2010129638A2 (fr) * 2009-05-08 2010-11-11 Daas Ip Management, Llc Ensemble disque de rupture
US20110016692A1 (en) * 2005-08-01 2011-01-27 Hollars Anthony S Compressed gas cartridge lance housing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6810730U (de) * 1968-03-04 1971-06-03 Nat Forge Co Hochdruckgefaess.
US5832947A (en) * 1997-01-17 1998-11-10 Niemczyk; Andrew Gas shut-off and pressure relief valve for a high pressure gas vessel
WO2003089823A1 (fr) * 2002-04-19 2003-10-30 Western Valve Procede et appareil pour un dispositif d'echappement orbital et soude destine a une bouteille de gaz comprime
US20110016692A1 (en) * 2005-08-01 2011-01-27 Hollars Anthony S Compressed gas cartridge lance housing
US20080178938A1 (en) * 2007-01-30 2008-07-31 Fike Corporation Rupture disc assembly that withstands much higher back pressures than actuation pressure
WO2010129638A2 (fr) * 2009-05-08 2010-11-11 Daas Ip Management, Llc Ensemble disque de rupture

Also Published As

Publication number Publication date
JP2014532849A (ja) 2014-12-08
EP2773898A1 (fr) 2014-09-10
US20130112691A1 (en) 2013-05-09
EP2773898B1 (fr) 2016-01-06

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