WO2009029023A1 - Soupape de sécurité anti-incendie - Google Patents

Soupape de sécurité anti-incendie Download PDF

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Publication number
WO2009029023A1
WO2009029023A1 PCT/SE2008/050928 SE2008050928W WO2009029023A1 WO 2009029023 A1 WO2009029023 A1 WO 2009029023A1 SE 2008050928 W SE2008050928 W SE 2008050928W WO 2009029023 A1 WO2009029023 A1 WO 2009029023A1
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WO
WIPO (PCT)
Prior art keywords
safety valve
fire safety
holes
disc
pressure
Prior art date
Application number
PCT/SE2008/050928
Other languages
English (en)
Inventor
Pelle Rangsten
Johan Bejhed
Maria BJÖRKLUND
Tor-Arne GRÖNLAND
Håkan JOHANSSON
Kerstin Jonsson
Original Assignee
Nanospace Ab
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 Nanospace Ab filed Critical Nanospace Ab
Publication of WO2009029023A1 publication Critical patent/WO2009029023A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
    • F16K17/38—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature
    • F16K17/383—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature the valve comprising fusible, softening or meltable elements, e.g. used as link, blocking element, seal, closure plug
    • 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
    • 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
    • F17C2201/0119—Shape cylindrical with flat 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
    • F17C2201/03—Orientation
    • F17C2201/032—Orientation with substantially vertical main axis
    • 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
    • F17C2201/052—Size large (>1000 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/054—Size medium (>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
    • F17C2203/0612—Wall structures
    • F17C2203/0614—Single wall
    • F17C2203/0617—Single wall with one layer
    • 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
    • F17C2203/0648—Alloys or compositions of metals
    • 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
    • F17C2203/0656—Metals in form of 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
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0311—Closure means
    • F17C2205/0317—Closure means fusing or melting
    • 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
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/221—Welding
    • 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
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • 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
    • F17C2223/03—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
    • F17C2260/017—Improving mechanical properties or manufacturing by calculation
    • 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
    • F17C2260/02—Improving properties related to fluid or fluid transfer
    • F17C2260/021—Avoiding over pressurising
    • 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
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/042—Reducing risk of explosion
    • 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
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/044—Avoiding pollution or contamination
    • 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
    • F17C2270/00—Applications
    • F17C2270/05—Applications for industrial use

Definitions

  • the present invention relates in general to gas valves and in particular to high-pressure fire safety valves.
  • a breakable sealing plate is supported by an actuator, which in turn is kept in position by a volume of an alloy of a low melting temperature. At a too high temperature, the alloy melts and escapes through holes. The actuator can not withstand the pressure from the sealing plate and is moved, whereby the sealing plate breaks and allows evacuation through an additional opening.
  • An object of the present invention is to provide a simple and relatively inexpensive high-pressure fire safety valve.
  • a further object of the present invention is to provide a high-pressure fire safety valve that is easily added to existing high-pressure containers without consuming too much space around the ordinary valve.
  • a high- pressure fire safety valve comprises a disc that is capable of mechanically withstanding a high -pressure difference.
  • the disc has a multitude of holes penetrating through the disc. Each of the holes has a smallest diameter of less than 100 micrometer.
  • the high-pressure fire safety valve further comprises a sealing substance in a solid phase, sealing each of the holes.
  • the sealing substance exhibits a phase transition into a fluid state at elevated temperatures. This configuration results in that the multitude of holes constitute straight evacuation channels for the high pressure when the sealing substance has performed said phase transition.
  • a high pressure gas container comprises a high-pressure fire safety valve according to the first aspect.
  • a method for manufacturing a high-pressure fire safety valve comprises providing of a disc and creating of a multitude of holes penetrating through the disc. Each of the holes has a smallest diameter of less than 100 micrometers. The method further comprises sealing of the multitude of holes by a sealing substance. The sealing substance is such that it exhibits a phase transition into a fluid state at elevated temperatures.
  • MEMS techniques are used for manufacturing the disc.
  • FIG. IA is a cross-sectional partial view of an embodiment of a high- pressure fire safety valve according to the present invention
  • FIG. IB is a view of the embodiment of Fig. IA when being opened;
  • FIGS. 2A-D are examples of hole shapes useable in a high-pressure fire safety valve according to the present invention
  • FIG. 3 is a flow diagram of steps of an embodiment of a manufacturing method according to the present invention
  • FIGS. 4A-B are embodiments of a high-pressure fire safety valve according to the present invention comprising protection films
  • FIG. 5 is a cross-section view of an embodiment of a high-pressure gas container according to the present invention.
  • FIG. 6A is a cross-section view of an embodiment of an intermediate coupling usable in embodiments of a high-pressure gas container according to the present invention.
  • FIG. 6B is a top view of a high-pressure fire safety valve used in the embodiment of Fig. 6A.
  • FIG. 7 is a cross-section view of another embodiment of an intermediate coupling usable in embodiments of a high-pressure gas container according to the present invention.
  • high-pressure refers to pressures above 20 bars.
  • the advantages of the present invention are however larger for pressures over 50 bars and even larger for pressures above 100 bars, since explosion risks generally increases with increasing pressure.
  • Components are therefore typically made of high-strength materials, such as metals and ceramics.
  • Seals are preferably made by welding in order to ensure the sealing operation by a certain distance of solid material. In seals that cannot be welded, rubber o-rings are typically mounted under high forces in order to ensure the tightness. Less strong sealings based on e.g. adhesion, surface tension, membranes etc. are normally not considered at all for high-pressure applications.
  • the present invention is based on two insights.
  • the first is that also relatively weak materials may withstand high pressures if only the area over which the pressure is applied is small enough.
  • the other is that limitations in discharge rates due to small dimensions of discharge channels can be compensated by instead providing a high number of discharge channels.
  • Such a small hole can also be utilised for discharge purposes.
  • the small diameter will heavily restrict the discharge rate.
  • discharge rate is one of the crucial parameters.
  • a total discharge rate can be achieved, which can be sufficient in typical gas storage applications.
  • R gas is the general gas constant.
  • the gas container has a maximum allowed temperature T max of 400 K. At maximum temperature, the gas container will have a maximum pressure P max of 273 bar according to:
  • a maximum temperature increase dT is less than 100 K per minute.
  • a safety evacuation starts.
  • the increase in pressure dP due to an increased temperature has to be compensated by a flux of mass dm evacuating from the container.
  • the pressure increase dP can be determined as: T.
  • the necessary mass flux becomes 0.19 kg/s.
  • a flow of a liquid through an orifice depends on the ratio LId , i.e. length- to- diameter ratio, as well as on the rounding of the entrance.
  • a total orifice area A (divided into 100 micrometers orifices) that is necessary to achieve the necessary mass flux is given by:
  • the evacuation holes are, however, too large to withstand high pressures and can therefore not immediately be applied in high-pressure gas applications.
  • Fig. IA illustrates a cross-sectional partial view of an embodiment of a high- pressure fire safety valve 1 according to the present invention.
  • the illustration is not drawn with a true relationship between different dimensions, in order to increase the readability of the figure.
  • the main discrepancies from the drawing scales are noted below.
  • a disc 10 is capable of mechanically withstanding a high pressure difference.
  • the disc 10 thereby has a thickness t that is sufficient to bear the intended maximum pressure over the high-pressure fire safety valve 1.
  • the disc is made in silicon, glass or metal.
  • the disc 10 has a multitude of holes 12 penetrating straight through the disc 10.
  • the holes 12 have a smallest diameter d of at most 100 micrometers and preferably at most 50 micrometers.
  • the holes 12 are filled with a sealing substance 20 in a solid phase, thereby sealing each hole 12.
  • the sealing substance exhibits a phase transition into a fluid state at a predetermined elevated temperature or temperature range.
  • Examples of possible sealing substance to be used in the present invention are e.g. metals. Pure metals with a sufficient low melting temperature can be used. Alloys and in particular solders having a relatively low melting temperature can advantageously be used. However, also other sealing substances, such as paraffin, different polymers, in particular thermoplastic polymers, and different kinds of low-temperature melting glasses are possible to use.
  • the holes 12 have in the present embodiment a tapered shape, with a larger diameter D at an intended high-pressure side 11 than a diameter at an intended low-pressure side 13, which in the present embodiment is the smallest diameter d of the holes 12.
  • the tapered shape assists the sealing substance in sealing the holes, by transforming a part of the applied forces due to the pressure difference to compression forces within the sealing material and thereby enforcing the seal.
  • the holes 12 in reality are much smaller than the thickness t of the disc, even much smaller than illustrated.
  • the smallest diameter d of each hole is less than 1 / 10 of the thickness t of the disc 10.
  • the distance between two adjacent holes is preferably much larger than the disc thickness, also in discrepancy to the drawn dimensions.
  • the number or holes can by advantage be large, thus giving a higher evacuation rate.
  • the multitude of holes also presents a redundancy if some holes do not open correctly. In a preferred embodiment, there are therefore more than 20 holes, and in an even more preferred embodiments, there are at least 100 holes.
  • Fig. IB illustrates the same high-pressure fire safety valve 10 when being utilised.
  • the high-pressure on the high-pressure side 11 has pushed the phase transitioned sealing substance out from the holes, leaving straight evacuation channels 18 for the high pressure gas to evacuate through.
  • the holes 12 presents a line of sight 16 through said disc.
  • the line of sight 16 should preferably be provided in a direction essentially perpendicular 14 to the disc surface.
  • the holes can be designed in many different ways.
  • Fig. 2A another embodiment is illustrated, where the hole is a hole of uniform cross- section through the entire disc, i.e. a hole with straight, parallel walls. Such holes are easiest to manufacture. However, in order to support the sealing action of the sealing substance, it is as mentioned above advantageous if a portion with decreasing diameter is present somewhere along the hole.
  • the hole has a smallest diameter in the middle of the disc. The diameters at the disc surfaces are larger, which probably will improve the gas flow properties somewhat.
  • Fig. 2C has an even more rounded off shape.
  • Fig. 2D an embodiment having an asymmetric hole is illustrated. As anyone skilled in the art understands, there are numerous of possible shapes and designs of holes, having different advantages when applied in the present invention.
  • Fig. 3 illustrates a flow diagram of steps of an embodiment of a method according to the present invention.
  • a method for manufacturing a high- pressure fire safety valve starts in step 200.
  • a disc is provided.
  • a multitude of holes are created in step 220, which holes penetrate straight through the disc. Each of the holes has a smallest diameter of less than 100 micrometers.
  • step 220 is at least to a part performed by MEMS techniques, as indicated by step 222.
  • step 230 the multitudes of holes are sealed by a sealing substance.
  • the sealing substance exhibits a phase transition into a fluid state at elevated temperatures.
  • the sealing is made utilising the capillary forces of the narrow holes.
  • Step 230 therefore preferable comprises a step 232 where a sealing substance is melted into a fluid state.
  • step 234 the multitude of holes in the disc is brought into contact with a surface of the melted sealing substance.
  • sealing substance is in step 236 sucked up into the multitudes of holes. If capillary forces are not sufficient, a pressure difference can be applied over the disc, assisting in sucking or pressing the sealing substance into the multitude of holes.
  • the disc is removed from the melted sealing substance and is allowed to cool down in step 238 without any significant pressure difference across the disc. In such a way, the sealing substance solidifies within the holes, creating a sealing of the holes.
  • the process is ended in step 299.
  • the high-pressure fire safety valve can be additionally covered by a thin layer of a substance inert to the aggressive gas on the high-pressure side.
  • a thin layer 15 of a material inert to the aggressive gas Three embodiments are illustrated in Figs. 4 A and 4B.
  • Fig. 4A the entire high-pressure side of the high-pressure fire safety valve is covered by a thin layer 15 of a material inert to the aggressive gas.
  • the thickness of the thin layer 15 is considerably smaller than the disc thickness.
  • the thin layer 15 should be thin enough to break for the high- pressure difference when the sealing substance 20 is removed.
  • the thin layer 15 is preferably applied after the holes have been sealed, i.e.
  • the techniques for providing the thin layer are preferably adapted to the used material.
  • materials that could be used as an inert thin layer 15 are different kinds of polymers or corrosion resistant metals or alloys. Typical thicknesses could be in the order of a few micrometers for e.g. the polymers or even less, e.g. for metal coatings.
  • the thin coating 15 may be provided in such a way that only the substances that may be affected by the gas are covered.
  • the disc material is inert to the gas, while the sealing substance is not.
  • the thin coating 15 is therefore restricted to areas covering the sealing substance and preferably a small safety region around the sealing substance.
  • the high-pressure fire safety valve presented above is intended to be mounted at a high-pressure gas container.
  • One possibility is to have a dedicated opening in the high-pressure gas container that is sealed by such a valve.
  • the any additional devices may be positioned far from the area around the normal outlet valves, and does thereby not compete about the available space.
  • such solutions call for specially designed high-pressure gas containers.
  • a high-pressure gas container 30 has a shell 31 with an outlet opening 32.
  • the shell 31 encloses a high-pressure gas volume 33.
  • An intermediate coupling 34 is mounted at the outlet opening 32 and a discharge valve arrangement 36 is mounted at the intermediate coupling 34.
  • the threading of the upper part 38 of the intermediate coupling 34 is of the same type and dimensions as the threading 37 of the high- pressure gas container 30.
  • the intermediate coupling 34 is thus a short extension of the gas flow path 35 between the interior of the high-pressure gas container 30 and the discharge valve arrangement 36.
  • the intermediate coupling 34 also comprises a high-pressure fire safety valve 1 according to the principles described further above.
  • the high-pressure fire safety valve 1 seals a connection between the flow path 35 in the intermediate coupling 34 with the surrounding.
  • Fig. 6A is a cross section of an intermediate coupling 34 that can be used in a high-pressure gas container, such as in Fig. 5.
  • a high-pressure gas container 30 is illustrated by dotted lines.
  • the intermediate coupling 34 is mounted in a threading 37 of the high-pressure gas container 30 with a threading 42 of an inner part 41 of a main body 40 of the intermediate coupling 34.
  • the inner part 41 is generally tube-shaped and has an outwards directed flange 45.
  • An outer part 43 of the main body 40 is mechanically fastened (not shown in the figure) to the inner part 41 at at least a number of locations around the intermediate 34 to ensure mechanical rigidity between the inner and outer parts 41, 43.
  • the outer part 43 has an inwards directed flange 47 in the same level as the flange 45.
  • a high-pressure fire safety valve 1 is received on the flanges 43, 45.
  • Two circular o-rings 44, 46 are sealing the high-pressure fire safety valve 1, and are clamped by an inner clamping ring 48 threaded into the inner part 41 and an outer clamping ring 50 threaded into the outer part 43.
  • the outer clamping ring 50 has an inner threading 51 which in the present embodiment is identical to the threading 37 of the high-pressure gas container 30.
  • the discharge valve arrangement 36 illustrated by dotted lines, is mounted by means of the inner threading 51.
  • the intermediate coupling 34 provides an open flow path 35 between the high-pressure gas container 30 and the discharge valve arrangement 36.
  • the intermediate coupling 34 also provides a flow path 52 from the high-pressure gas container 30 to the high-pressure fire safety valve 1.
  • the disc 10 of the high-pressure fire safety valve 1, illustrated in a top view in Fig. 6B, has in the present embodiment a flat ring shape with a central opening 55.
  • the holes 12 of the high-pressure fire safety valve 1 are situated in the interior of the ring-shape, leaving non-perforated rims 57 at the inner and outer sides of the disc 10.
  • the rims 57 are intended to be interaction surfaces with the o-rings 44, 46 (Fig. 6A).
  • the high-pressure fire safety valve 1 when the high-pressure fire safety valve 1 opens, i.e. when the area around the high-pressure fire safety valve 1 becomes warm enough to melt the sealing substance of the high-pressure fire safety valve 1, gas can escape through the high-pressure fire safety valve 1 using the flow path 52.
  • the high-pressure fire safety valve 1 is arranged in a direction 54 giving a downwards, as illustrated in the Fig. 6A, directed flow of escaping gas.
  • the high-pressure fire safety valve 1 is mounted in a direction for directing gas flowing out 54 through the high-pressure fire safety valve 1 towards the shell 31 of the high-pressure gas volume 33.
  • the gas flowing out through the high-pressure fire safety valve 1 is generally of a lower temperature than the surrounding and in particular lower than gas heated directly by the fire. In such a way, the gas flowing out may form a protecting region of gas, somewhat reducing the further heating of the high-pressure gas volume 33 by the heat from an external fire. Also the flow as such will contribute somewhat to a cooling of the high-pressure gas container 30.
  • a main body 40 comprises at least one and preferably a number of side channels 60, directed essentially perpendicular to the main flow path 35.
  • the high-pressure fire safety valve 1 is supported against a flange 63 via an o-ring 64.
  • the high-pressure fire safety valve 1 is pressed and secured by a locking ring 66 fastened into a threading 62 of the side channel 60.
  • the high-pressure fire safety valve 1 is in this embodiment full discs and typically smaller in size, but instead several high-pressure fire safety valves 1 can be mounted in the same intermediate coupling 34.
  • the high-pressure fire safety valve 1 has in this embodiment its holes in a central region, whereas the rim of the disc is used for fastening purposes.
  • This embodiment can be designed very compact, whereby the additional occupied space will be very small, compared with an arrangement without fire safety arrangements.
  • the intermediate coupling 34 can easily be used together with already existing equipment.
  • Already existing gas container can thus easily be upgraded to include a fire safety arrangement according to the present invention.
  • the embodiments described above are to be understood as a few illustrative examples of the present invention. It will be understood by those skilled in the art that various modifications, combinations and changes may be made to the embodiments without departing from the scope of the present invention. In particular, different part solutions in the different embodiments can be combined in other configurations, where technically possible. The scope of the present invention is, however, defined by the appended claims.

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

Abstract

La présente invention porte sur une soupape de sécurité haute pression anti-incendie (1) qui comprend un disque (10) qui peut résister mécaniquement à une différence de pression élevée. Le disque (10) possède une multitude de trous (12) traversant le disque (10). Chacun des trous (12) a un diamètre (d) minimal inférieur à 100 micromètres. La soupape de sécurité haute pression anti-incendie (1) comprend en outre une substance d'étanchéité (20) dans une phase solide, fermant hermétiquement chacun des trous (12). La substance d'étanchéité (20) présente une transition de phase dans un état fluide à des températures élevées. Cette configuration a pour résultat que la multitude de trous (12) constitue des canaux d'évacuation droits pour la pression élevée, lorsque la substance d'étanchéité (20) a effectué ladite transition de phase. La présente invention porte également sur un contenant de gaz haute pression comprenant une telle soupape de sécurité haute pression anti-incendie et sur un procédé de fabrication d'une telle soupape de sécurité haute pression anti-incendie.
PCT/SE2008/050928 2007-08-31 2008-08-18 Soupape de sécurité anti-incendie WO2009029023A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0701983A SE532578C2 (sv) 2007-08-31 2007-08-31 Brandsäkerhetsventil
SE0701983-9 2007-08-31

Publications (1)

Publication Number Publication Date
WO2009029023A1 true WO2009029023A1 (fr) 2009-03-05

Family

ID=40387551

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/050928 WO2009029023A1 (fr) 2007-08-31 2008-08-18 Soupape de sécurité anti-incendie

Country Status (2)

Country Link
SE (1) SE532578C2 (fr)
WO (1) WO2009029023A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2951243A1 (fr) * 2009-10-12 2011-04-15 Air Liquide Dispositif de securite pour recipient de gaz et recipient pourvu d'un tel dispositif
FR3008767A1 (fr) * 2013-07-17 2015-01-23 Air Liquide Dispositif de securite et recipient de stockage de gaz pourvu d'un tel dispositif
WO2018097779A1 (fr) * 2016-11-23 2018-05-31 Scania Cv Ab Dispositif de sécurité, agencement de réservoir et véhicule
US10695598B2 (en) 2017-08-28 2020-06-30 Justrite Manufacturing Company, Llc Vented safety cabinet with thermally-actuated damper

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6006774A (en) * 1994-12-21 1999-12-28 Cti Composite Products Thermally activated pressure relief valve or fuse plug for protecting pressurized devices from over pressure due to fire
US6367500B1 (en) * 1999-07-14 2002-04-09 Luxembourg Patent Company, S.A. Safety valve for a compressed-gas tank
US7111818B2 (en) * 2004-03-29 2006-09-26 Neriki Valve Co., Ltd. Safety valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6006774A (en) * 1994-12-21 1999-12-28 Cti Composite Products Thermally activated pressure relief valve or fuse plug for protecting pressurized devices from over pressure due to fire
US6367500B1 (en) * 1999-07-14 2002-04-09 Luxembourg Patent Company, S.A. Safety valve for a compressed-gas tank
US7111818B2 (en) * 2004-03-29 2006-09-26 Neriki Valve Co., Ltd. Safety valve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2951243A1 (fr) * 2009-10-12 2011-04-15 Air Liquide Dispositif de securite pour recipient de gaz et recipient pourvu d'un tel dispositif
FR3008767A1 (fr) * 2013-07-17 2015-01-23 Air Liquide Dispositif de securite et recipient de stockage de gaz pourvu d'un tel dispositif
WO2018097779A1 (fr) * 2016-11-23 2018-05-31 Scania Cv Ab Dispositif de sécurité, agencement de réservoir et véhicule
US10695598B2 (en) 2017-08-28 2020-06-30 Justrite Manufacturing Company, Llc Vented safety cabinet with thermally-actuated damper
US11957942B2 (en) 2017-08-28 2024-04-16 Justrite Manufacturing Company, L.L.C. Vented safety cabinet with thermally-actuated damper

Also Published As

Publication number Publication date
SE532578C2 (sv) 2010-02-23
SE0701983L (sv) 2009-03-01

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