WO2017125098A1 - Boss for a composite pressure receptacle - Google Patents

Boss for a composite pressure receptacle Download PDF

Info

Publication number
WO2017125098A1
WO2017125098A1 PCT/CZ2016/050004 CZ2016050004W WO2017125098A1 WO 2017125098 A1 WO2017125098 A1 WO 2017125098A1 CZ 2016050004 W CZ2016050004 W CZ 2016050004W WO 2017125098 A1 WO2017125098 A1 WO 2017125098A1
Authority
WO
WIPO (PCT)
Prior art keywords
flange
boss
plug
thread
engagement means
Prior art date
Application number
PCT/CZ2016/050004
Other languages
French (fr)
Inventor
Pavel DUBININ
Stanislav DUBININ
Original Assignee
Hpc Research S.R.O.
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 Hpc Research S.R.O. filed Critical Hpc Research S.R.O.
Priority to PCT/CZ2016/050004 priority Critical patent/WO2017125098A1/en
Publication of WO2017125098A1 publication Critical patent/WO2017125098A1/en

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
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/16—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of plastics materials
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/056—Small (<1 m3)
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0604—Liners
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0614—Single wall
    • F17C2203/0619—Single wall with two layers
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0639—Steels
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/066—Plastics
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/0663—Synthetics in form of fibers or filaments
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0305—Bosses, e.g. boss collars
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/05—Vessel or content identifications, e.g. labels
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/031—Air
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/035—High pressure (>10 bar)
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/036—Very high pressure (>80 bar)
    • 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/015—Facilitating maintenance

Definitions

  • the present invention relates to construction of a boss for composite pressure receptacles.
  • Composite pressure receptacles are generally used for storing, transporting and distributing fluids and gases under high or low pressures, such as LPG, CNG, industrial gases or air.
  • a composite pressure receptacle consists of a composite container containing a composite outer shell bearing all pressure loads and an inner liner ensuring sealing of the container, usually made of polymer or metal, and an inlet/outlet system comprising a boss with a thread to fit a valve or a fitting for filling the receptacle and for subsequently distributing the content of the receptacle.
  • the inlet/outlet system has to be integrated into the container and ensure gas tightness of the connection between the inner liner and the boss with a connection port.
  • a sealing element typically, a sealing ring
  • the tightness is ensured by securing the inner liner of the composite container within the boss construction and sealing it by means of a sealing element (typically, a sealing ring) to prevent the leaking of the content.
  • a sealing element typically, a sealing ring
  • the external part of the boss is further secured to the receptacle by being at least partially enclosed within the composite outer shell of the composite container to prevent the disengaging of the boss from the composite container.
  • bosses for the composite pressure receptacles suffer from the impossibility of disassembling for control of the components and for replacement of the sealing element (e.g., sealing ring). As the sealing element is exposed to longterm loads, it may become damaged, and this damage means that the whole composite pressure receptacle or at least the boss must be replaced.
  • the sealing element e.g., sealing ring
  • US 2012/085727 proposes a boss design in which the components may be disassembled to replace individual components, including the sealing element. It consists of an external part and an internal part, the inner liner of the container being secured between the external part and the internal part by means of sealing rings. The external part and the internal part are screwed to each other, thus, they must be provided with a thread. The accuracy of the thread which forms a part of the sealing system and thus should not allow leaks requires very precise and therefore costly production.
  • the aim of the present invention is to provide a design of a boss for composite pressure receptacles which can be disassembled to replace individual components (e.g. a sealing element), while maintaining a simple, cost-effective construction.
  • the present invention provides a boss for a composite pressure receptacle comprising an inner liner and an outer composite shell, said boss comprising
  • a circular flange for being located circumferentially between the inner liner and the outer composite shell, said flange having at least a part of its inner surface provided with an engagement means, and said flange being provided with a thread at least in a part of its inner or outer surface, and/or with a groove for housing of a retaining ring,
  • a circular plug with a central opening provided with a thread (tapered or parallel) suitable for engaging a valve or a fitting
  • the outer surface of the plug comprises a first portion of the surface adjacent to the opening of the boss, a second portion adjacent to the first portion, a third portion adjacent to the second portion, wherein the first portion comprises a circumferential recess, the second portion is provided with an engagement means to engage with the engagement means of the inner surface of the flange, and the third part includes at least one groove for insertion of a sealing element
  • annular fixing element i.e. nut or retaining ring, shaped to fit with the recess in the first portion of the outer surface of the plug.
  • the engagement means provided in the flange and in the plug may be selected from the group comprising tapering of a part of the inner surface of the flange and compatible tapering of a part of the outer surface of the plug, a spline keys, slots, feathers, flat surfaces or skirt with engrailment.
  • the engagment means are provided in order to prevent rotation of the plug during valve or fitting installation.
  • the annular fixing element is a nut having a substantially reshaped cross-section and is provided with a thread on its inner surface, while the flange is provided with a corresponding thread on its outer surface.
  • the annular fixing element is a nut which is provided with a thread on its outer surface and the flange is provided with a corresponding thread on its inner surface.
  • the annular fixing element is a retaining ring fitted into the flange which is provided with a corresponding groove on its inner surface to house a retaining ring.
  • the boss assembly can be equipped with a labeling ring.
  • the ring may also ensure proper fiber placement around cylinder neck.
  • the present invention further provides a composite pressure receptacle comprising an inner liner, an outer composite shell, and the boss according to the invention.
  • the inner liner is made of metal, such as steel, or of polymeric material, such as polyethylene or polyethyleneterephtalate.
  • the flange of the boss is preferably fixed into the composite shell, e.g., by integrating during winding.
  • the flange can be equipped with circumferential grooves and spline keys or flat surfaces.
  • the design of the invention allows to remove the annular fixing element, i.e to unscrew the nut or unclip the retaining ring and remove the plug for sealing replacement and periodical inspection of the inner liner. This is not possible in most prior art designs. Furthermore, the present invention does not require any additional measures for preventing plug rotation during valve installation, which is due to the separation of the fixing element from the plug, which is connected to composite material through the flange and through the engagement means. Thus, for valve installation, the receptacle can be held by the body (container).
  • the design of the invention further allows for the use of any type of standard valves and threads with no torque limitation.
  • Fig. 1 shows a general view of the composite pressure receptacle harboring the boss of the present invention.
  • Fig. 2 shows the boss design according to example 1 in cross-section.
  • Fig. 3 shows the boss design according to example 2 in cross-section.
  • Fig. 4 shows the boss design according to example 3 in cross-section.
  • Fig. 5 shows the boss design according to example 4 in cross-section.
  • Fig. 6 shows the boss design according to example 4 in exploded view.
  • Fig. 1 shows the cross- section of a composite pressure receptacle (composite pressure cylinder), comprising an outer composite shell 2, an inner liner I, and a boss 3.
  • the boss is shown in Fig. 2.
  • the boss comprises a circular flange 8.
  • the flange is mounted circumferentially between the inner liner I and the outer composite shell 2.
  • the flange has a part of its inner surface provided with an engagement means consisting in tapering, fitting with the corresponding tapering of the plug 6; and the flange 8 is further provided with a thread in a part of its outer surface.
  • the tapered skirt of a plug can be replaced by a spline keys, slots, feathers, flat surfaces or skirt with engrailment to transfer higher torque.
  • the boss further comprises a circular plug 6 with a truncated-conical outer shape and a central opening. The central opening is provided with a thread suitable for engaging a valve or a fitting.
  • the outer surface of the plug 6 comprises a first portion of the surface, a second portion adjacent to the first portion, and a third portion adjacent to the second portion.
  • the first portion which is located adjacent to the opening of the boss, comprises a circumferential recess
  • the second portion is provided with a tapering, which represents an engagement means 9 to engage with the engagement means of the inner surface of the flange
  • the third part includes a groove into which a sealing element 7 is inserted.
  • the boss further comprises an annular fixing element, which is a nut 5 with a substantially L-shaped cross-section shaped to fit with the recess in the first portion of the outer surface of the plug 6, and is provided with a thread 10 on a part of its inner surface to engage with the thread on the flange 8.
  • the boss assembly is further equipped by a labeling ring 4.
  • the detail of the boss is shown in Fig. 3.
  • the boss comprises a circular flange 8.
  • the flange is mounted circumferentially between the inner liner1 and the outer composite shell 2.
  • the flange has a part of its inner surface provided with an engagement means consisting in tapering, fitting with the corresponding tapering of the plug 6; and the flange 8 is further provided with a thread in a part of its inner surface.
  • the tapered skirt of a plug can be replaced by a spline keys, flat surfaces, slots, feathers or skirt with engrailment to transfer higher torque.
  • the boss further comprises a circular plug 6 with a truncated-conical outershape and a central opening.
  • the central opening is provided with a thread suitable for engaging a valve or a fitting.
  • the outer surface of the plug 6 comprises a first portion of the surface, a second portion adjacent to the first portion, and a third portion adjacent to the second portion.
  • the first portion comprises a circumferential recess
  • the second portion is provided with a tapering, which represents an engagement means 9 to engage with the engagement means of the inner surface of the flange 8
  • the third part includes a groove into which a sealing element 7 is inserted.
  • the boss further comprises an annular fixing element, which is a nut 5 shaped to fit with the recess in the first portion of the outer surface of the plug 6, and is provided with a thread 10 on a part of its outer surface to engage with the thread on the flange 8.
  • annular fixing element which is a nut 5 shaped to fit with the recess in the first portion of the outer surface of the plug 6, and is provided with a thread 10 on a part of its outer surface to engage with the thread on the flange 8.
  • the boss assembly is further equipped by a labeling ring 4.
  • Example 3
  • the detail of the boss is shown in Fig. 4.
  • the boss comprises a circular flange 8.
  • the flange is mounted circumferentially between the inner liner I and the outer composite shell 2.
  • the flange has a part of its inner surface provided with an engagement means consisting in slots, fitting with the corresponding feathers of a plug 6; and the flange 8 is further provided with a thread in a part of its outer surface.
  • the feathers of the plug 6 can be replaced by a taper skirt, a spline keys, flat surfaces or skirt with engrailment.
  • the boss further comprises the circular plug 6 with a truncated-conical outer shape and a central opening.
  • the central opening is provided with a thread suitable for engaging a valve or a fitting.
  • the outer surface of the plug 6 comprises a first portion of the surface , a second portion adjacent to the first portion, and a third portion adjacent to the second portion.
  • the first portion comprises a circumferential recess
  • the second portion is provided with a feathers, which represents an engagement means 9 to engage with the engagement means of the flange 8
  • the third part includes a groove into which a sealing element 7 is inserted.
  • the boss further comprises an annular fixing element, which is a nut 5 with a substantially L-shaped cross-section shaped to fit with the recess in the first portion of the outer surface of the plug 6, and is provided with a thread 10 on a part of its inner surface to engage with the thread on the flange 8.
  • annular fixing element which is a nut 5 with a substantially L-shaped cross-section shaped to fit with the recess in the first portion of the outer surface of the plug 6, and is provided with a thread 10 on a part of its inner surface to engage with the thread on the flange 8.
  • the boss assembly is further equipped by a labeling ring 4.
  • Example 4 The detail of the boss is shown in figs 5 and 6.
  • the boss comprises a circular flange 8.
  • the flange is mounted circumferentially between the inner liner1 and the outer composite shell 2.
  • the flange has a part of its inner surface provided with an engagement means consisting in slots, fitting with the corresponding feathers of a plug 6; and the flange 8 is further provided with a groove in a part of its inner surface.
  • the feathers of the plug can be replaced by a spline keys or flat surfaces .
  • the boss further comprises a circular plug 6 with a truncated-conical outer shape and a central opening.
  • the central opening is provided with a thread suitable for engaging a valve or a fitting.
  • the outer surface of the plug comprises a first portion or the surface located closest to the maximum diameter of the plug, a second portion adjacent to the first portion, and a third portion adjacent to the second portion.
  • the first portion comprises a circumferential recess
  • the second portion is provided with a feathers, which represents an engagement means 9 to engage with the engagement means of the flange 8
  • the third part includes a groove into which a sealing element 7 is inserted.
  • the boss further comprises an annular fixing element 5, which is a retaining ring shaped to fit with the recess in the first portion of the outer surface of the plug 6 and to engage with the groove on the flange 8.
  • the boss assembly is further equipped by a labeling ring 4.
  • the composite pressure receptacles provide with a boss according to the present invention can be used for storage and transportation of fluids and gases under low or high pressure, such as LPG, CNG, industrial gases or air.
  • the described design is particularly suitable for fully wrapped composite cylinders.

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

Abstract

The present invention provides a boss for a composite pressure receptacle comprising an inner liner (1) and an outer composite shell (2), said boss comprising: - a circular flange (8) for being located circumferentially between the inner liner (1) and the outer composite shell (2), said flange (8) having at least a part of its inner surface provided with an engagement means, and said flange being provided with a thread or at least one groove in a part of its inner or outer surface, - a circular plug (6) with central opening provided with a thread suitable for engaging a valve or a fitting, and wherein the outer surface of the plug (6) comprises a first portion of the surface, a second portion adjacent to the first portion, a third portion adjacent to the second portion, wherein the first portion comprises a circumferential recess, the second portion is provided with an engagement means (9) to engage with the engagement means of the inner surface of the flange (8), and the third part includes at least one groove for insertion of a sealing element (7), - an annular fixing element (5) shaped to fit with the recess in the first portion of the outer surface of the plug (6), and which engages with the flange (8). The invention further provides a composite pressure receptable comprising an inner liner (1), an outer composite shell (2), and the boss according to the invention.

Description

BOSS FOR A COMPOSITE PRESSURE RECEPTACLE
Field of Art The present invention relates to construction of a boss for composite pressure receptacles. Background Art
Composite pressure receptacles are generally used for storing, transporting and distributing fluids and gases under high or low pressures, such as LPG, CNG, industrial gases or air. Typically, a composite pressure receptacle consists of a composite container containing a composite outer shell bearing all pressure loads and an inner liner ensuring sealing of the container, usually made of polymer or metal, and an inlet/outlet system comprising a boss with a thread to fit a valve or a fitting for filling the receptacle and for subsequently distributing the content of the receptacle.
The inlet/outlet system has to be integrated into the container and ensure gas tightness of the connection between the inner liner and the boss with a connection port. Several types of construction of the boss are known in the prior art. The tightness is ensured by securing the inner liner of the composite container within the boss construction and sealing it by means of a sealing element (typically, a sealing ring) to prevent the leaking of the content. Generally, the external part of the boss is further secured to the receptacle by being at least partially enclosed within the composite outer shell of the composite container to prevent the disengaging of the boss from the composite container.
Most known designs of bosses for the composite pressure receptacles suffer from the impossibility of disassembling for control of the components and for replacement of the sealing element (e.g., sealing ring). As the sealing element is exposed to longterm loads, it may become damaged, and this damage means that the whole composite pressure receptacle or at least the boss must be replaced.
US 2012/085727 proposes a boss design in which the components may be disassembled to replace individual components, including the sealing element. It consists of an external part and an internal part, the inner liner of the container being secured between the external part and the internal part by means of sealing rings. The external part and the internal part are screwed to each other, thus, they must be provided with a thread. The accuracy of the thread which forms a part of the sealing system and thus should not allow leaks requires very precise and therefore costly production.
The aim of the present invention is to provide a design of a boss for composite pressure receptacles which can be disassembled to replace individual components (e.g. a sealing element), while maintaining a simple, cost-effective construction.
Disclosure of the Invention
The present invention provides a boss for a composite pressure receptacle comprising an inner liner and an outer composite shell, said boss comprising
- a circular flange for being located circumferentially between the inner liner and the outer composite shell, said flange having at least a part of its inner surface provided with an engagement means, and said flange being provided with a thread at least in a part of its inner or outer surface, and/or with a groove for housing of a retaining ring,
- a circular plug with a central opening provided with a thread (tapered or parallel) suitable for engaging a valve or a fitting, and wherein the outer surface of the plug comprises a first portion of the surface adjacent to the opening of the boss, a second portion adjacent to the first portion, a third portion adjacent to the second portion, wherein the first portion comprises a circumferential recess, the second portion is provided with an engagement means to engage with the engagement means of the inner surface of the flange, and the third part includes at least one groove for insertion of a sealing element,
- an annular fixing element, i.e. nut or retaining ring, shaped to fit with the recess in the first portion of the outer surface of the plug.
The engagement means provided in the flange and in the plug may be selected from the group comprising tapering of a part of the inner surface of the flange and compatible tapering of a part of the outer surface of the plug, a spline keys, slots, feathers, flat surfaces or skirt with engrailment. The engagment means are provided in order to prevent rotation of the plug during valve or fitting installation. In one preferred embodiment, the annular fixing element is a nut having a substantially reshaped cross-section and is provided with a thread on its inner surface, while the flange is provided with a corresponding thread on its outer surface.
In another preferred embodiment, the annular fixing element is a nut which is provided with a thread on its outer surface and the flange is provided with a corresponding thread on its inner surface. In another preferred embodiment, the annular fixing element is a retaining ring fitted into the flange which is provided with a corresponding groove on its inner surface to house a retaining ring.
For technological and marking purposes, the boss assembly can be equipped with a labeling ring. The ring may also ensure proper fiber placement around cylinder neck.
The present invention further provides a composite pressure receptacle comprising an inner liner, an outer composite shell, and the boss according to the invention. Preferably, the inner liner is made of metal, such as steel, or of polymeric material, such as polyethylene or polyethyleneterephtalate.
The flange of the boss is preferably fixed into the composite shell, e.g., by integrating during winding. To ensure proper fixation of the flange in the composite shell, the flange can be equipped with circumferential grooves and spline keys or flat surfaces.
The design of the invention allows to remove the annular fixing element, i.e to unscrew the nut or unclip the retaining ring and remove the plug for sealing replacement and periodical inspection of the inner liner. This is not possible in most prior art designs. Furthermore, the present invention does not require any additional measures for preventing plug rotation during valve installation, which is due to the separation of the fixing element from the plug, which is connected to composite material through the flange and through the engagement means. Thus, for valve installation, the receptacle can be held by the body (container). The design of the invention further allows for the use of any type of standard valves and threads with no torque limitation.
The invention is further illustrated by means of figures and examples, which should not be construed as limiting the claimed scope.
Brief description of drawings
Fig. 1 shows a general view of the composite pressure receptacle harboring the boss of the present invention.
Fig. 2 shows the boss design according to example 1 in cross-section.
Fig. 3 shows the boss design according to example 2 in cross-section.
Fig. 4 shows the boss design according to example 3 in cross-section.
Fig. 5 shows the boss design according to example 4 in cross-section.
Fig. 6 shows the boss design according to example 4 in exploded view.
Examples of carrying out the Invention
Example 1
The design described in this example is shown in figs 1 and 2. Fig. 1 shows the cross- section of a composite pressure receptacle (composite pressure cylinder), comprising an outer composite shell 2, an inner liner I, and a boss 3.
The boss is shown in Fig. 2. The boss comprises a circular flange 8. The flange is mounted circumferentially between the inner liner I and the outer composite shell 2. The flange has a part of its inner surface provided with an engagement means consisting in tapering, fitting with the corresponding tapering of the plug 6; and the flange 8 is further provided with a thread in a part of its outer surface. The tapered skirt of a plug can be replaced by a spline keys, slots, feathers, flat surfaces or skirt with engrailment to transfer higher torque. The boss further comprises a circular plug 6 with a truncated-conical outer shape and a central opening. The central opening is provided with a thread suitable for engaging a valve or a fitting. The outer surface of the plug 6 comprises a first portion of the surface, a second portion adjacent to the first portion, and a third portion adjacent to the second portion. The first portion, which is located adjacent to the opening of the boss, comprises a circumferential recess, the second portion is provided with a tapering, which represents an engagement means 9 to engage with the engagement means of the inner surface of the flange, and the third part includes a groove into which a sealing element 7 is inserted. The boss further comprises an annular fixing element, which is a nut 5 with a substantially L-shaped cross-section shaped to fit with the recess in the first portion of the outer surface of the plug 6, and is provided with a thread 10 on a part of its inner surface to engage with the thread on the flange 8.
The boss assembly is further equipped by a labeling ring 4.
Example 2
The detail of the boss is shown in Fig. 3. The boss comprises a circular flange 8. The flange is mounted circumferentially between the inner liner1 and the outer composite shell 2. The flange has a part of its inner surface provided with an engagement means consisting in tapering, fitting with the corresponding tapering of the plug 6; and the flange 8 is further provided with a thread in a part of its inner surface. The tapered skirt of a plug can be replaced by a spline keys, flat surfaces, slots, feathers or skirt with engrailment to transfer higher torque.
The boss further comprises a circular plug 6 with a truncated-conical outershape and a central opening. The central opening is provided with a thread suitable for engaging a valve or a fitting. The outer surface of the plug 6 comprises a first portion of the surface, a second portion adjacent to the first portion, and a third portion adjacent to the second portion. The first portion comprises a circumferential recess, the second portion is provided with a tapering, which represents an engagement means 9 to engage with the engagement means of the inner surface of the flange 8, and the third part includes a groove into which a sealing element 7 is inserted.
The boss further comprises an annular fixing element, which is a nut 5 shaped to fit with the recess in the first portion of the outer surface of the plug 6, and is provided with a thread 10 on a part of its outer surface to engage with the thread on the flange 8.
The boss assembly is further equipped by a labeling ring 4. Example 3
The detail of the boss is shown in Fig. 4. The boss comprises a circular flange 8. The flange is mounted circumferentially between the inner liner I and the outer composite shell 2. The flange has a part of its inner surface provided with an engagement means consisting in slots, fitting with the corresponding feathers of a plug 6; and the flange 8 is further provided with a thread in a part of its outer surface. The feathers of the plug 6 can be replaced by a taper skirt, a spline keys, flat surfaces or skirt with engrailment.
The boss further comprises the circular plug 6 with a truncated-conical outer shape and a central opening. The central opening is provided with a thread suitable for engaging a valve or a fitting. The outer surface of the plug 6 comprises a first portion of the surface , a second portion adjacent to the first portion, and a third portion adjacent to the second portion. The first portion comprises a circumferential recess, the second portion is provided with a feathers, which represents an engagement means 9 to engage with the engagement means of the flange 8, and the third part includes a groove into which a sealing element 7 is inserted.
The boss further comprises an annular fixing element, which is a nut 5 with a substantially L-shaped cross-section shaped to fit with the recess in the first portion of the outer surface of the plug 6, and is provided with a thread 10 on a part of its inner surface to engage with the thread on the flange 8.
The boss assembly is further equipped by a labeling ring 4.
Example 4 The detail of the boss is shown in figs 5 and 6. The boss comprises a circular flange 8. The flange is mounted circumferentially between the inner liner1 and the outer composite shell 2. The flange has a part of its inner surface provided with an engagement means consisting in slots, fitting with the corresponding feathers of a plug 6; and the flange 8 is further provided with a groove in a part of its inner surface. The feathers of the plug can be replaced by a spline keys or flat surfaces .
The boss further comprises a circular plug 6 with a truncated-conical outer shape and a central opening. The central opening is provided with a thread suitable for engaging a valve or a fitting. The outer surface of the plug comprises a first portion or the surface located closest to the maximum diameter of the plug, a second portion adjacent to the first portion, and a third portion adjacent to the second portion. The first portion comprises a circumferential recess, the second portion is provided with a feathers, which represents an engagement means 9 to engage with the engagement means of the flange 8, and the third part includes a groove into which a sealing element 7 is inserted.
The boss further comprises an annular fixing element 5, which is a retaining ring shaped to fit with the recess in the first portion of the outer surface of the plug 6 and to engage with the groove on the flange 8.
The boss assembly is further equipped by a labeling ring 4.
Industrial Applicability
The composite pressure receptacles provide with a boss according to the present invention can be used for storage and transportation of fluids and gases under low or high pressure, such as LPG, CNG, industrial gases or air. The described design is particularly suitable for fully wrapped composite cylinders.

Claims

1. A boss for a composite pressure receptacle comprising an inner liner (1) and an outer composite shell (2), said boss comprising:
- a circular flange (8) for being located circumferentially between the inner liner (1) and the outer composite shell (2), said flange (8) having at least a part of its inner surface provided with an engagement means, and said flange being provided with a thread or at least one groove in a part of its inner or outer surface,
- a circular plug (6) with central opening provided with a thread suitable for engaging a valve or a fitting, and wherein the outer surface of the plug (6) comprises a first portion of the surface, a second portion adjacent to the first portion, a third portion adjacent to the second portion, wherein the first portion comprises a circumferential recess, the second portion is provided with an engagement means (9) to engage with the engagement means of the inner surface of the flange (8), and the third part includes at least one groove for insertion of a sealing element (7),
- an annular fixing element (5) shaped to fit with the recess in the first portion of the outer surface of the plug (6), and which engages with the flange (2).
2. The boss according to claim 1, wherein the engagement means provided in the flange (8) and in the plug (6) are selected from the group comprising tapering of a part of the inner surface of the flange (8) and compatible tapering of a part of the outer surface of the plug (6), a spline keys, flat surfaces, slots, feathers or skirt with engrailment.
3. The boss according to claim 1 or 2, wherein the annular fixing element (5) is a nut which has a substantially L-shaped cross-section and is provided with a thread on its inner surface, while the flange (8) is provided with a corresponding thread on its outer surface.
4. The boss according to claim 1 or 2, wherein the annular fixing element (5) is a nut which is provided with a thread on its outer surface and the flange (2) is provided with a corresponding thread on its inner surface.
5. The boss according to claim 1 or 2, wherein the annular fixing element (5) is a retainig ring and the flange (8) is provided with a corresponding groove on its inner surface.
6. The boss according to any one of the preceding claims, wherein the boss is further equipped by a labeling ring (4).
7. The boss according to any one of the preceding claims, wherein the flange (8) is equipped with circumferential grooves and spline keys or flat surfaces.
8. A composite pressure receptacle comprising an inner liner (1), an outer composite shell (2), and the boss according to any one of the preceding claims.
9. The composite pressure receptacle according to claim 8 wherein the inner liner (1) is made of metal, such as steel, or of polymeric material, such as polyethylene or polyethyleneterephtalate .
10. The composite pressure receptacle according to claim 8 or 9 wherein the flange (8) of the boss is fixed into the composite shell (2) and wherein the flange (8) can optionally be equipped with circumferential grooves and spline keys or flat surfaces for improving the fixing.
PCT/CZ2016/050004 2016-01-18 2016-01-18 Boss for a composite pressure receptacle WO2017125098A1 (en)

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CN112780769A (en) * 2021-01-21 2021-05-11 开能健康科技集团股份有限公司 Insert, pressure vessel and water treatment device
EP3964745A1 (en) * 2020-09-03 2022-03-09 Rolls-Royce plc Composite gas storage tank
WO2022170078A1 (en) * 2021-02-05 2022-08-11 Cryoport, Inc. Tapered vapor plug
IT202100003650A1 (en) * 2021-02-17 2022-08-17 Carbon Cylinder S R L CYLINDER WITH PLASTIC MATERIAL CORE AND COMPOSITE LINING PROVIDED WITH PORT AND RELATIVE PRODUCTION METHOD

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DE102014207069A1 (en) * 2014-04-11 2015-10-15 Bayerische Motoren Werke Aktiengesellschaft Connection element for a pressure tank and pressure tank
CZ2014544A3 (en) * 2014-08-15 2016-01-20 Hpc Research S.R.O. Pipe socket for composite pressure vessels

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WO1999013263A1 (en) * 1997-09-08 1999-03-18 Raufoss Composites As Pressure container for fluids
DE102009014057A1 (en) * 2009-03-20 2010-09-23 Daimler Ag Pressure vessel for storing hydrogen gas for driving land-based motor vehicle, has liner made of plastic, and flange cooperating with support ring at wall, where section of outer circumference of flange is conical
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EP3964745A1 (en) * 2020-09-03 2022-03-09 Rolls-Royce plc Composite gas storage tank
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CN112780769A (en) * 2021-01-21 2021-05-11 开能健康科技集团股份有限公司 Insert, pressure vessel and water treatment device
CN112780769B (en) * 2021-01-21 2023-02-28 开能健康科技集团股份有限公司 Pressure vessel and water treatment device
WO2022170078A1 (en) * 2021-02-05 2022-08-11 Cryoport, Inc. Tapered vapor plug
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