EP2683978A1 - Cylinder valve having a device for reducing or closing off the flow in the event of a rise in temperature - Google Patents

Cylinder valve having a device for reducing or closing off the flow in the event of a rise in temperature

Info

Publication number
EP2683978A1
EP2683978A1 EP12707082.9A EP12707082A EP2683978A1 EP 2683978 A1 EP2683978 A1 EP 2683978A1 EP 12707082 A EP12707082 A EP 12707082A EP 2683978 A1 EP2683978 A1 EP 2683978A1
Authority
EP
European Patent Office
Prior art keywords
passage
valve
closing
shape memory
bottle
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP12707082.9A
Other languages
German (de)
French (fr)
Inventor
Claude Risse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Luxembourg Patent Co SA
Original Assignee
Luxembourg Patent Co SA
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 Luxembourg Patent Co SA filed Critical Luxembourg Patent Co SA
Publication of EP2683978A1 publication Critical patent/EP2683978A1/en
Withdrawn legal-status Critical Current

Links

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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/30—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces specially adapted for pressure containers
    • F16K1/307—Additional means used in combination with the main valve
    • 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
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/30—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces specially adapted for pressure containers
    • F16K1/304—Shut-off valves with additional means
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/002—Actuating devices; Operating means; Releasing devices actuated by temperature variation
    • 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
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • 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
    • F17C13/04—Arrangement or mounting of valves
    • 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
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • F17C13/123—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures for gas bottles, cylinders or reservoirs for tank vehicles or for railway tank wagons
    • 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
    • F17C2205/0323—Valves
    • 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
    • F17C2205/0382—Constructional details of valves, regulators
    • 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
    • F17C2205/0382—Constructional details of valves, regulators
    • F17C2205/0385—Constructional details of valves, regulators in blocks or units
    • 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
    • F17C2205/0388—Arrangement of valves, regulators, filters
    • F17C2205/0394—Arrangement of valves, regulators, filters in direct contact with the pressure vessel
    • 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
    • F17C2221/011—Oxygen
    • 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
    • F17C2221/016—Noble gases (Ar, Kr, Xe)
    • F17C2221/017—Helium
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0439—Temperature
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0636—Flow or movement of content
    • 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
    • F17C2270/00—Applications
    • F17C2270/02—Applications for medical applications
    • F17C2270/025—Breathing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7737—Thermal responsive

Definitions

  • the invention relates to a cylinder valve for pressurized gas. More specifically, the invention relates to a cylinder valve for pressurized gas provided with a closure valve.
  • the invention is applicable to applications involving different types of gas, it is particularly suitable for oxidizing gases sensitive to adiabatic compressions, more particularly to oxygen applications.
  • filters were provided between the main valve and the expander but these filters have the disadvantage of curbing the flow of gas when the bottle is almost empty. In addition, filters can clog. As a result, they suffer shocks at each opening and can generate particles.
  • high pressure which may be of the order of 300 bars or more, that is to say if the gas cylinder is filled, the known filters do not pose problems and do not impede the flow.
  • the filters cause a constant pressure drop, and at a low pressure of less than 50 bar disturbances start and become particularly penalizing at 10 bars. These known filters causing a constant pressure drop therefore hinder the expansion curve of the low pressure gas.
  • patent document EP 1 500 854 A1 discloses a cylinder valve provided with a non-sealed valve disposed between an opening / closing valve and a valve valve.
  • the valve is normally in a normal passage section position.
  • the valve is rapidly moved by the pressurized gas to a position of limited passage section in order to reduce the shock wave applied to the expander. After balancing the pressures on both sides of the valve, the latter resumes its normal passage section position.
  • US Patent 7,225,810 B2 discloses a bottle valve equipped with a valve similar to that of the previous document and intended for the same function.
  • valves are certainly an interesting solution but has a disadvantage of complexity related to a reliability constraint, and a disadvantage of not permanently preventing combustion during the opening of the valve. Indeed, in the presence of impurities in the passage of the valve and in particular in the presence of oxygen under high pressure, combustion can still occur and generate serious safety problems. Indeed, in case of combustion, flames may come out of the tap and cause burns, damage to nearby equipment and / or cause fires.
  • the invention aims to provide a bottle valve overcomes at least one of the aforementioned drawbacks. More particularly, the invention aims to provide a bottle valve reducing the risk of burns and fire when handling the valve including highly oxidizing gases such as oxygen.
  • the invention relates to a pressurized gas bottle tap, comprising a body with a gas inlet, a gas outlet and a gas passage connecting the inlet with the outlet; a valve for closing and / or reducing the passage of gas; remarkable in that it further comprises a device for reducing or closing the passage in response to a rise in temperature, the device being disposed in the body downstream of the closure valve.
  • Such a valve is designed to work at pressures greater than or equal to 50 bar, preferably 100 bar, more preferably still at 200 bar.
  • the valve comprises an expansion valve disposed downstream of the reduction or closure device of the passage, preferably in the valve body.
  • the regulator can be integrated into the valve body. The latter may consist of several assembled elements.
  • the reduction or closure device of the passage is configured to reduce or close the passage of gas when the temperature in the gas passage exceeds 100 ° C, preferably 120 ° C, more preferably still 150 ° C.
  • the device for reducing or closing the passage is mechanical.
  • This device is in fact preferentially purely mechanical.
  • the device for reducing or closing the passage comprises a shape memory alloy element adapted to deform when its temperature exceeds a predefined level.
  • the shape memory alloy element has a memory effect only during a rise in temperature.
  • the device for reducing or closing the passage is configured in such a way that deformation of the shape memory alloy element directly reduces or closes the passage.
  • the shape memory alloy element comprises a deformable part with a circular edge capable of cooperating with a fixed surface, preferably formed directly in the body, so as to reduce or close the passage.
  • the deformable portion of the shape memory alloy element has a general shape of a dome.
  • the diameter of the circular edge increases when its temperature exceeds the predefined level, preferably more than 10% beyond 100 ° C, 120 ° C, or 150 ° vs.
  • the shape memory alloy element comprises a generally elongated portion attached to the deformable portion, the generally elongated portion ensuring the attachment of the element to the body.
  • the generally elongated portion comprises a male thread cooperating with a corresponding female thread in the body.
  • the device for reducing or closing the passage comprises a cylindrical cavity with a first zone of a first diameter receiving the deformable portion of the shape memory alloy element. and a second zone of a second inner diameter at the first and upstream of the first zone, such that the service gas flow must circumvent the circular outer edge of the domed portion.
  • the deformable portion of the shape memory alloy element is dome-shaped with a circular outer edge disposed in the cavity so that the hollow of the dome is directed to the second area of the cavity.
  • the cavity comprises a third zone adjacent to the first zone and opposite to the first zone, with means for fixing the shape memory alloy element, preferably a thread. female.
  • the invention makes it possible to take advantage of the increase in temperature caused by combustion during the opening of the closure / opening valve, and this to ensure a closure or at least a quasi automatic closure in a very short time. Given the fact that a combustion within such a valve can not be excluded, even in the presence of devices as described in the "prior art" part, the valve according to the invention provides a significant safety advantage .
  • Figure 1 is a sectional view of a bottle valve according to the invention.
  • Figure 2 is a sectional view along 2-2 of the valve of Figure 1.
  • Figure 3 is a sectional view of the closure device of the valve in case of temperature rise present in the valve of Figure 1, with however another design of the shape memory alloy element, the device being in the open position.
  • Figure 4 is a sectional view of the closure device of the valve in case of temperature rise present in the valve of Figure 1, with however another design of the shape memory alloy element, the device being in the closed position.
  • the cylinder valve 2 for pressurized gas comprises a body 4 with a gas inlet 8, an outlet (not shown) and a passage 10 connecting the inlet with the outlet.
  • the body comprises a male thread 6 intended to be screwed onto the neck of a gas cylinder.
  • the valve also comprises a closure valve 26 shown in Figure 2.
  • the latter is a sectional view of the valve of Figure 1 along the axis 2-2. It can be seen the conduit 10 serving as a gas passage.
  • the closure valve 26 comprises a member movable in translation and rotation, and provided with a sealing ring cooperating with a seat formed in the body of the valve. This movable element is actuated by a steering wheel 24 accessible from outside the valve and disposed on the side of the body.
  • a device adapted to close the gas passage when the temperature exceeds a critical threshold Downstream of the closing and opening valve 26 is arranged a device adapted to close the gas passage when the temperature exceeds a critical threshold.
  • This device comprises in particular a chamber 14 and a shape memory alloy element 16.
  • the latter comprises a portion forming a head capable of changing shape in a known manner. More particularly, the head of the shape memory alloy element comprises a circular outer edge capable of changing size so as to cooperate with the cavity 14 in which it is received. In case of elevation of the head of the shape memory alloy element beyond a critical threshold, the latter will change shape so that the diameter of its outer edge increases until it comes into contact with the inner surface of the cavity 14 and closes the gas passage automatically.
  • the shape memory alloy element is in the closed position, namely that the outer edge of its portion intended to cooperate with the cavity is in sealing contact with said cavity.
  • Shape memory alloys are alloys possessing several novel properties among metallic materials: the ability to keep in memory an initial shape and to return to it even after deformation, the possibility of alternating between two previously memorized forms when its temperature varies around a critical temperature, and a super elastic behavior allowing elongations without permanent deformation superior to those of other metals.
  • major shape memory alloys a variety of alloys of nickel and titanium are found as major constituents in almost equal proportions.
  • Nickel-Titanium Naval Ordnance Laboratory is in fact only the name of one of these “nickel-titanium quasi-equiatomic alloys", this name has become widely used in the literature to describe all these alloys, which have very similar properties. To a lesser extent, brass and some copper-aluminum alloys also have shape memory properties.
  • the active part, in this case the head, of the shape memory alloy element is able to deform so that the diameter of its outer edge increases by at least 5%, preferably 10 %, more preferably still 15%.
  • the critical temperature may vary depending on the choice of material. In the case of application to bottle valves, since these usually operate at ambient temperatures generally between 0 ° C and 30 ° C, the critical threshold will be at least approximately at about 100 ° C, 120 ° C or 150 ° C.
  • the closure device must remain open in a fairly wide temperature range, for example between -40 ° C and + 70 ° C to cover extreme temperatures in which the faucet may have to operate normally.
  • the pressurization of the gas passage between said valve and the expander 12 may give rise to transiently to adiabatic compressions likely to generate temperature increases and initiate combustion inside the body of the valve. Such combustion can be made possible by the presence of residues or impurities in the valve in combustible materials.
  • the flames can leave the valve especially because of the large flow of oxygen.
  • the presence of an automatic closure device or at least reduction of the gas passage ensures the tap a certain level of security against this problem remained until then without any real solution.
  • the shape memory alloy element will very quickly heat up and exceed its critical threshold. It then goes in a very short time directly linked to its thermal inertia become deformed and come into contact with the inner wall of the cavity. This contact will close the passage of gas, in this case oxygen, and thus stop the flames.
  • the device may therefore be a device for reducing or reducing the passage of the gas and not a total closure device.
  • the cavity 14 opens upstream on a filter 20 disposed in a connector 22.
  • the gas passing through the cavity 14 will therefore encounter a first loss-generating shrinkage formed by the filter and a second shrinkage directly downstream at the the seat of the regulator.
  • the losses of charges formed by these elements will accentuate the shock wave at the gas when opening the closing / opening valve.
  • This shock wave will be born in the cavity 14.
  • a reduction device of the passage section may also increase the safety of the valve by significantly limiting the spread of flames outside the valve.
  • Figure 3 illustrates the closure device of Figure 1 with however a design of the different shape memory alloy element at the active part or head of the element.
  • the latter 16 comprises a first active part 161 in the form of a dome and a second generally cylindrical part 162.
  • the cavity 14 is generally cylindrical with a first zone 141 of a given first diameter and in which the active part 161 of the element is located.
  • the cavity 14 also comprises a second zone 142 directly adjacent to the first zone and in fluidic connection with the latter.
  • the second zone has a diameter smaller than that of the first.
  • the domed portion 161 of the member 16 is oriented so that its hollow portion is oriented toward the second zone 142 of the cavity 14.
  • the cavity 14 is supplied with gas radially at the second zone 142. The gas thus flows bypassing the back and the outer edge of the domed portion.
  • the cylindrical portion 162 of the element 16 ends with a male thread 163 engaged in a female thread made in a third zone 143 of the cavity 14.
  • the three zones 141, 142 and 143 of the cavity 14 are concentric.
  • the temperature in the first zone 141 of the cavity 14 will increase.
  • the dome-shaped active part 161 of the element 16 will increase in temperature and will deform to take the form shown in FIG. 4.
  • the dome 161 has flattened and its outside diameter has increased so as to be in contact with each other. with the inner surface of the cavity 14. This super elastic deformation thus allows the gas passage to be closed and the combustion to be stopped.
  • the dome or umbrella shape of this part oriented so that its hollow is oriented upstream of the gas flow, allows this part to deform further in the direction of closure under the effect of the shock wave caused by its deformation.
  • shape memory alloy elements which are illustrated in Figures 1, 3 and 4 are purely illustrative. They may take various forms other than those illustrated.

Landscapes

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

Abstract

The invention relates to a cylinder valve (2) pressurized gas. The body (4) of the valve (2) includes a gas inlet (8), a gas outlet (not shown) and a passage (10) connecting the inlet to the outlet. The valve (2) also includes a closing/opening valve (26) (figure 2), a pressure reducer (12) and a device for reducing or closing the gas passage between said valve and a pressure reducer (12). The device includes an element (16) that is made of shape-memory alloy and positioned in a cavity (14) of the passage (10). Said element (16) includes an active deformable portion, the circular outer edge of which is capable of engaging with the inner surface of the cavity (14) in order to close the passage following a rise in temperature caused by combustion. Said combustion can be generated by adiabatic compression during the opening of the valve (26).

Description

Description  Description
ROBINET BOUTEILLE AVEC DISPOSITIF DE REDUCTION OU DE FERMETURE DU PASSAGE EN CAS D'ELEVATION DE TEMPERATURE  BOTTLE TAP WITH DEVICE FOR REDUCING OR CLOSING THE PASSAGE IN CASES OF TEMPERATURE RAISING
Domaine technique  Technical area
[0001] L'invention a trait à un robinet bouteille pour gaz sous pression. Plus précisément, l'invention a trait à un robinet bouteille pour gaz sous pression pourvu d'une vanne de fermeture. Bien que l'invention soit applicable à des applications faisant intervenir différents types de gaz, elle est particulièrement adaptée aux gaz oxydants sensibles aux compressions adiabatique, plus particulièrement encore aux applications oxygène.  The invention relates to a cylinder valve for pressurized gas. More specifically, the invention relates to a cylinder valve for pressurized gas provided with a closure valve. Although the invention is applicable to applications involving different types of gas, it is particularly suitable for oxidizing gases sensitive to adiabatic compressions, more particularly to oxygen applications.
Technique antérieure  Prior art
[0002] Les vitesses mises en jeu dans un robinet pour une bouteille de gaz à haute pression (supérieur à 200 bar) sont très élevées. Pour des gaz comme l'hélium les vitesses peuvent être largement supérieures à la vitesse du son. Avec des telles vitesses certains sièges ou pastilles en matière plastique du détendeur ne résistent pas au choc de compression adiabatique et peuvent brûler en présence d'un gaz oxydant. Il est donc utile de limiter la pression et ralentir la vitesse du gaz pour absorber l'onde de choc, lors de l'ouverture de la vanne principale du robinet en vue du soutirage du gaz.  [0002] The speeds involved in a tap for a high-pressure gas cylinder (greater than 200 bar) are very high. For gases such as helium speeds can be much higher than the speed of sound. With such speeds some plastic seats or pads of the regulator do not withstand adiabatic compression shock and can burn in the presence of an oxidizing gas. It is therefore useful to limit the pressure and slow down the speed of the gas to absorb the shock wave, when opening the main valve of the valve for the withdrawal of gas.
[0003] Dans la technique antérieure des filtres étaient prévus entre la vanne principale et le détendeur mais ces filtres ont le désavantage de freiner le débit de gaz lorsque la bouteille est presque vide. De plus, les filtres peuvent se colmater. De ce fait, ils subissent des chocs à chaque ouverture et peuvent générer des particules. En haute pression, qui peut être de l'ordre de 300 bars ou plus, c'est-à-dire si la bouteille de gaz est remplie, les filtres connus ne posent pas de problèmes et ne gênent pas le débit. Par contre, les filtres causent une perte de charge constante, et à faible pression inférieure à 50 bars des perturbations commencent et deviennent particulièrement pénalisantes à 10 bars. Ces filtres connus causant une perte de charge constante gênent donc la courbe de détente du gaz à faible pression. In the prior art filters were provided between the main valve and the expander but these filters have the disadvantage of curbing the flow of gas when the bottle is almost empty. In addition, filters can clog. As a result, they suffer shocks at each opening and can generate particles. In high pressure, which may be of the order of 300 bars or more, that is to say if the gas cylinder is filled, the known filters do not pose problems and do not impede the flow. On the other hand, the filters cause a constant pressure drop, and at a low pressure of less than 50 bar disturbances start and become particularly penalizing at 10 bars. These known filters causing a constant pressure drop therefore hinder the expansion curve of the low pressure gas.
[0004] D'autres solutions moins pénalisantes lorsque la pression bouteille diminue ont été développées.  [0004] Other less penalizing solutions when the bottle pressure decreases have been developed.
[0005] Par exemple, le document de brevet EP 1 500 854 A1 divulgue un robinet bouteille pourvu d'un clapet non-étanche disposé entre une vanne d'ouverture/fermeture et un détendeur du robinet. Le clapet se trouve normalement dans une position à section de passage normale. Lorsque la vanne est ouverte, le clapet est rapidement déplacé par le gaz sous pression vers une position à section de passage limitée en vue de réduire l'onde de choc appliquée au détendeur. Après équilibrage des pressions sur les deux côtés du clapet, ce dernier reprend sa position à section de passage normale.  For example, patent document EP 1 500 854 A1 discloses a cylinder valve provided with a non-sealed valve disposed between an opening / closing valve and a valve valve. The valve is normally in a normal passage section position. When the valve is open, the valve is rapidly moved by the pressurized gas to a position of limited passage section in order to reduce the shock wave applied to the expander. After balancing the pressures on both sides of the valve, the latter resumes its normal passage section position.
[0006] Le document de brevet US 7,225,810 B2 divulgue un robinet bouteille équipé d'un clapet similaire à celui du document précédent et destiné à la même fonction.  US Patent 7,225,810 B2 discloses a bottle valve equipped with a valve similar to that of the previous document and intended for the same function.
[0007] Ces clapets constituent certes une solution intéressante mais présente toutefois un inconvénient de complexité lié à une contrainte de fiabilité, ainsi qu'un inconvénient de ne pas empêcher de manière définitive des combustions lors de l'ouverture de la vanne. En effet, en présence d'impuretés dans le passage du robinet et notamment en présence d'oxygène sous haute pression, des combustions peuvent quand même avoir lieu et générer des problèmes sérieux de sécurité. En effet, en cas de combustion, des flammes peuvent sortir du robinet et provoquer des brûlures, endommager du matériel avoisinant et/ou provoquer des incendies.  These valves are certainly an interesting solution but has a disadvantage of complexity related to a reliability constraint, and a disadvantage of not permanently preventing combustion during the opening of the valve. Indeed, in the presence of impurities in the passage of the valve and in particular in the presence of oxygen under high pressure, combustion can still occur and generate serious safety problems. Indeed, in case of combustion, flames may come out of the tap and cause burns, damage to nearby equipment and / or cause fires.
Résumé de l'invention  Summary of the invention
Problème technique  Technical problem
[0008] L'invention a pour objectif de proposer un robinet bouteille palliant au moins un des inconvénients sus mentionnés. Plus particulièrement, l'invention a pour objectif de proposer un robinet bouteille réduisant les risques de brûlures et d'incendie lors de la manipulation du robinet notamment avec des gaz très oxydants comme de l'oxygène. Solution technique The invention aims to provide a bottle valve overcomes at least one of the aforementioned drawbacks. More particularly, the invention aims to provide a bottle valve reducing the risk of burns and fire when handling the valve including highly oxidizing gases such as oxygen. Technical solution
[0009] L'invention a pour objet un robinet bouteille pour gaz sous pression, comprenant un corps avec une entrée de gaz, une sortie de gaz et un passage de gaz reliant l'entrée avec la sortie ; une vanne de fermeture et/ou de réduction du passage de gaz ; remarquable en ce qu'il comprend, en outre un dispositif de réduction ou de fermeture du passage en réaction à une élévation de température, le dispositif étant disposé dans le corps en aval de la vanne de fermeture.  The invention relates to a pressurized gas bottle tap, comprising a body with a gas inlet, a gas outlet and a gas passage connecting the inlet with the outlet; a valve for closing and / or reducing the passage of gas; remarkable in that it further comprises a device for reducing or closing the passage in response to a rise in temperature, the device being disposed in the body downstream of the closure valve.
[0010] Un tel robinet est conçu pour travailler à des pressions supérieures ou égales à 50 bars, préférentiellement à 100 bars, plus préférentiellement encore à 200 bars.  Such a valve is designed to work at pressures greater than or equal to 50 bar, preferably 100 bar, more preferably still at 200 bar.
[001 1] Selon un mode avantageux de l'invention, le robinet comprend un détendeur disposé en aval du dispositif de réduction ou de fermeture du passage, préférentiellement dans le corps du robinet. Le détendeur peut être intégré dans le corps du robinet. Ce dernier peut être constitué de plusieurs éléments assemblés.  [001 1] According to an advantageous embodiment of the invention, the valve comprises an expansion valve disposed downstream of the reduction or closure device of the passage, preferably in the valve body. The regulator can be integrated into the valve body. The latter may consist of several assembled elements.
[0012] Selon un autre mode avantageux de l'invention, le dispositif de réduction ou de fermeture du passage est configuré pour réduire ou fermer le passage de gaz lorsque la température dans le passage de gaz dépasse 100° C, préférentiellement 120°C, plus préférentiellement encore 150°C.  According to another advantageous embodiment of the invention, the reduction or closure device of the passage is configured to reduce or close the passage of gas when the temperature in the gas passage exceeds 100 ° C, preferably 120 ° C, more preferably still 150 ° C.
[0013] Selon un encore autre mode avantageux de l'invention, le dispositif de réduction ou de fermeture du passage est mécanique. Ce dispositif est en effet préférentiellement purement mécanique.  According to yet another advantageous embodiment of the invention, the device for reducing or closing the passage is mechanical. This device is in fact preferentially purely mechanical.
[0014] Selon un encore autre mode avantageux de l'invention, le dispositif de réduction ou de fermeture du passage comprend un élément en alliage à mémoire de forme apte à se déformer lorsque sa température dépasse un niveau prédéfini.  According to yet another advantageous embodiment of the invention, the device for reducing or closing the passage comprises a shape memory alloy element adapted to deform when its temperature exceeds a predefined level.
[0015] Selon un encore autre mode avantageux de l'invention, l'élément en alliage à mémoire de forme a un effet mémoire uniquement lors d'une élévation de température.  According to yet another advantageous embodiment of the invention, the shape memory alloy element has a memory effect only during a rise in temperature.
[0016] Selon un encore autre mode avantageux de l'invention, le dispositif de réduction ou de fermeture du passage est configuré de manière à ce que la déformation de l'élément en alliage à mémoire de forme opère directement la réduction ou la fermeture du passage. According to yet another advantageous embodiment of the invention, the device for reducing or closing the passage is configured in such a way that deformation of the shape memory alloy element directly reduces or closes the passage.
[0017] Selon un encore autre mode avantageux de l'invention, l'élément en alliage à mémoire de forme comprend une partie déformable avec un bord circulaire apte à coopérer avec une surface fixe, préférentiellement formée directement dans le corps, de manière à réduire ou fermer le passage. According to yet another advantageous embodiment of the invention, the shape memory alloy element comprises a deformable part with a circular edge capable of cooperating with a fixed surface, preferably formed directly in the body, so as to reduce or close the passage.
[0018] Selon un encore autre mode avantageux de l'invention, la partie déformable de l'élément en alliage à mémoire de forme présente une forme générale de dôme. According to yet another advantageous embodiment of the invention, the deformable portion of the shape memory alloy element has a general shape of a dome.
[0019] Selon un encore autre mode avantageux de l'invention, le diamètre du bord circulaire augmente lorsque sa température dépasse le niveau prédéfini, préférentiellement de plus de 10% au-delà de 100° C, 120°C, ou encore 150°C. According to yet another advantageous embodiment of the invention, the diameter of the circular edge increases when its temperature exceeds the predefined level, preferably more than 10% beyond 100 ° C, 120 ° C, or 150 ° vs.
[0020] Selon un encore autre mode avantageux de l'invention, l'élément en alliage à mémoire de forme comprend une partie généralement allongée attachée à la partie déformable, la partie généralement allongée assurant la fixation de l'élément au corps.  According to yet another advantageous embodiment of the invention, the shape memory alloy element comprises a generally elongated portion attached to the deformable portion, the generally elongated portion ensuring the attachment of the element to the body.
[0021] Selon un encore autre mode avantageux de l'invention, la partie généralement allongée comprend un filetage mâle coopérant avec un filetage femelle correspondant dans le corps.  According to yet another advantageous embodiment of the invention, the generally elongated portion comprises a male thread cooperating with a corresponding female thread in the body.
[0022] Selon un encore autre mode avantageux de l'invention, le dispositif de réduction ou de fermeture du passage comprend une cavité cylindrique avec une première zone d'un premier diamètre recevant la partie déformable de l'élément en alliage à mémoire de forme et une deuxième zone d'un deuxième diamètre intérieur au premier et en amont de la première zone, de manière à ce que l'écoulement de gaz de service doivent contourner le bord extérieur circulaire de la partie en forme de dôme.  According to yet another advantageous embodiment of the invention, the device for reducing or closing the passage comprises a cylindrical cavity with a first zone of a first diameter receiving the deformable portion of the shape memory alloy element. and a second zone of a second inner diameter at the first and upstream of the first zone, such that the service gas flow must circumvent the circular outer edge of the domed portion.
[0023] Selon un encore autre mode avantageux de l'invention, la partie déformable de l'élément en alliage à mémoire de forme est en forme de dôme avec un bord extérieur circulaire, disposé dans la cavité de manière à ce que le creux du dôme soit dirigé vers la deuxième zone de la cavité. [0024] Selon un encore autre mode avantageux de l'invention, la cavité comprend une troisième zone adjacente à la première zone et opposée à la première, avec des moyens de fixation de l'élément en alliage à mémoire de forme, préférentiellement un filetage femelle. According to yet another advantageous embodiment of the invention, the deformable portion of the shape memory alloy element is dome-shaped with a circular outer edge disposed in the cavity so that the hollow of the dome is directed to the second area of the cavity. According to yet another advantageous embodiment of the invention, the cavity comprises a third zone adjacent to the first zone and opposite to the first zone, with means for fixing the shape memory alloy element, preferably a thread. female.
Avantages apportés  Benefits brought
[0025] L'invention permet de mettre à profit l'augmentation de température provoquée par une combustion lors de l'ouverture de la vanne de fermeture/ouverture, et ce afin d'assurer une fermeture ou du moins une quasi fermeture automatique dans un délai très court. Compte tenu du fait qu'une combustion au sein d'un tel robinet ne peut pas être exclue, et ce même en présence de dispositifs tels que décrits dans la partie « Technique antérieure », le robinet selon l'invention procure un avantage sécuritaire important.  The invention makes it possible to take advantage of the increase in temperature caused by combustion during the opening of the closure / opening valve, and this to ensure a closure or at least a quasi automatic closure in a very short time. Given the fact that a combustion within such a valve can not be excluded, even in the presence of devices as described in the "prior art" part, the valve according to the invention provides a significant safety advantage .
[0026] Le fait d'utiliser un (ou plusieurs) élément(s) en alliage à mémoire de forme permet de rendre le temps de réponse très court et surtout compatible avec des gaz sous très haute pression et très oxydants comme de l'oxygène. En effet, des systèmes de fermeture automatique de débit gaz impliquant un élément fusible sont connus, notamment pour des fonctions anti-retour de flamme pour chalumeau. Une telle solution n'est évidemment pas applicable à un robinet bouteille où règne de l'oxygène à des pressions de l'ordre de 200 bars.  The fact of using one (or more) element (s) of shape memory alloy makes it possible to make the response time very short and especially compatible with very high pressure and highly oxidizing gases such as oxygen. . Indeed, automatic gas flow closure systems involving a fuse element are known, in particular for anti-flame back torch functions. Such a solution is obviously not applicable to a cylinder valve where oxygen reigns at pressures of the order of 200 bars.
[0027] De plus le fait d'utiliser un (ou plusieurs) élément(s) en alliage à mémoire de forme avec un bord apte à venir en contact direct avec une surface fixe en vue de la réduction ou de la fermeture du passage est particulièrement intéressant tant d'un point de vue simplicité de réalisation que d'un point de vue fiabilité.  In addition, the fact of using one (or more) element (s) shape memory alloy with an edge adapted to come into direct contact with a fixed surface for the reduction or closure of the passage is particularly interesting both from a simplicity of realization point of view that from a reliability point of view.
Brève description des dessins  Brief description of the drawings
[0028] La figure 1 est une vue en coupe d'un robinet bouteille conforme à l'invention.  Figure 1 is a sectional view of a bottle valve according to the invention.
[0029] La figure 2 est une vue en coupe selon 2-2 du robinet de la figure 1.  Figure 2 is a sectional view along 2-2 of the valve of Figure 1.
[0030] La figure 3 est une vue en coupe du dispositif de fermeture du robinet en cas d'élévation de température présent dans le robinet de la figure 1 , avec toutefois un autre design de l'élément en alliage à mémoire de forme, le dispositif étant en position ouverte. Figure 3 is a sectional view of the closure device of the valve in case of temperature rise present in the valve of Figure 1, with however another design of the shape memory alloy element, the device being in the open position.
[0031] La figure 4 est une vue en coupe du dispositif de fermeture du robinet en cas d'élévation de température présent dans le robinet de la figure 1 , avec toutefois un autre design de l'élément en alliage à mémoire de forme, le dispositif étant en position fermée. Figure 4 is a sectional view of the closure device of the valve in case of temperature rise present in the valve of Figure 1, with however another design of the shape memory alloy element, the device being in the closed position.
Description des modes de réalisation Description of the embodiments
[0032] Le robinet bouteille 2 pour gaz sous pression comprend un corps 4 avec une entrée de gaz 8, une sortie (non représentée) et un passage 10 reliant l'entrée avec la sortie. Le corps comprend un filetage mâle 6 destiné à être vissé sur le col d'une bouteille de gaz.  The cylinder valve 2 for pressurized gas comprises a body 4 with a gas inlet 8, an outlet (not shown) and a passage 10 connecting the inlet with the outlet. The body comprises a male thread 6 intended to be screwed onto the neck of a gas cylinder.
[0033] Le robinet comprend également une vanne de fermeture 26 illustrée à la figure 2. Cette dernière est une vue en coupe du robinet de la figure 1 selon l'axe 2-2. On y peut observer le conduit 10 servant de passage de gaz. La vanne de fermeture 26 comprend un élément mobile en translation et rotation, et pourvu d'une bague d'étanchéité coopérant avec un siège formée dans le corps de la vanne. Cet élément mobile est actionné par un volant 24 accessible depuis l'extérieur de la vanne et disposé sur le côté du corps.  The valve also comprises a closure valve 26 shown in Figure 2. The latter is a sectional view of the valve of Figure 1 along the axis 2-2. It can be seen the conduit 10 serving as a gas passage. The closure valve 26 comprises a member movable in translation and rotation, and provided with a sealing ring cooperating with a seat formed in the body of the valve. This movable element is actuated by a steering wheel 24 accessible from outside the valve and disposed on the side of the body.
[0034] En aval de la vanne de fermeture et d'ouverture 26 est disposé un dispositif apte à fermer le passage de gaz lorsque la température dépasse un seuil critique. Ce dispositif comprend notamment une chambre 14 et un élément en alliage à mémoire de forme 16. Ce dernier comprend une partie formant une tête apte à changer de forme de manière notoire. Plus particulièrement la tête de l'élément en alliage à mémoire de forme comprend un bord extérieur circulaire apte à changer de taille de manière à coopérer avec la cavité 14 dans laquelle elle est reçue. En cas d'élévation de température de la tête de l'élément en alliage à mémoire de forme au-delà d'un seuil critique, celui-ci va changer de forme de manière à ce que le diamètre de son bord extérieur augmente jusqu'à ce qu'il vienne en contact avec la surface interne de la cavité 14 et ferme le passage de gaz de manière automatique. [0035] A la figure 1 , l'élément en alliage à mémoire de forme est en position de fermeture, à savoir que le bord extérieur de sa partie destinée à coopérer avec la cavité est en contact étanche avec ladite cavité. Downstream of the closing and opening valve 26 is arranged a device adapted to close the gas passage when the temperature exceeds a critical threshold. This device comprises in particular a chamber 14 and a shape memory alloy element 16. The latter comprises a portion forming a head capable of changing shape in a known manner. More particularly, the head of the shape memory alloy element comprises a circular outer edge capable of changing size so as to cooperate with the cavity 14 in which it is received. In case of elevation of the head of the shape memory alloy element beyond a critical threshold, the latter will change shape so that the diameter of its outer edge increases until it comes into contact with the inner surface of the cavity 14 and closes the gas passage automatically. In Figure 1, the shape memory alloy element is in the closed position, namely that the outer edge of its portion intended to cooperate with the cavity is in sealing contact with said cavity.
[0036] Les alliages à mémoire de forme (AMF) sont des alliages possédant plusieurs propriétés inédites parmi les matériaux métalliques : la capacité de garder en mémoire une forme initiale et d'y retourner même après une déformation, la possibilité d'alterner entre deux formes préalablement mémorisées lorsque sa température varie autour d'une température critique, et un comportement super élastique permettant des allongements sans déformation permanente supérieurs à ceux des autres métaux. Parmi les principaux alliages à mémoire de forme, on retrouve toute une variété d'alliages de nickel et de titane comme constituants principaux, en proportions presque égales. Bien que « nitinol » (« Nickel-Titane Naval Ordnance Laboratory ») ne soit en fait que le nom de l'un de ces « alliages quasi-équiatomiques nickel-titane », cette appellation est devenue couramment utilisée dans la littérature pour désigner l'ensemble de ces alliages, qui ont des propriétés fort semblables. Dans une moindre mesure, le laiton et certains alliages cuivre-aluminium possèdent également des propriétés de mémoire de forme.  [0036] Shape memory alloys (AMF) are alloys possessing several novel properties among metallic materials: the ability to keep in memory an initial shape and to return to it even after deformation, the possibility of alternating between two previously memorized forms when its temperature varies around a critical temperature, and a super elastic behavior allowing elongations without permanent deformation superior to those of other metals. Among the major shape memory alloys, a variety of alloys of nickel and titanium are found as major constituents in almost equal proportions. Although "nitinol" ("Nickel-Titanium Naval Ordnance Laboratory") is in fact only the name of one of these "nickel-titanium quasi-equiatomic alloys", this name has become widely used in the literature to describe all these alloys, which have very similar properties. To a lesser extent, brass and some copper-aluminum alloys also have shape memory properties.
[0037] La partie active, en l'occurrence la tête, de l'élément en alliage à mémoire de forme est apte à se déformer de manière à ce que le diamètre de son bord extérieur augmente d'au moins 5%, préférentiellement 10%, plus préférentiellement encore 15%. Un tel comportement super élastique permettant de tels allongements sans déformation permanente peut être atteint par un choix judicieux du matériau et un design adapté de la partie active de l'élément. La température critique peut varier en fonction du choix du matériau. Dans le cas d'application à des robinets bouteille, étant donné que ces derniers fonctionnent habituellement à des températures ambiantes généralement comprises entre 0°C et 30°C, le seuil critique sera situé au moins approximativement à environ 100°C, 120°C ou encore 150°C. Le dispositif de fermeture devra rester ouvert dans une plage de température assez large comme par exemple comprise entre -40°C et +70°C afin de couvrir des températures extrêmes dans lesquelles le robinet est susceptible de devoir fonctionner normalement. The active part, in this case the head, of the shape memory alloy element is able to deform so that the diameter of its outer edge increases by at least 5%, preferably 10 %, more preferably still 15%. Such super elastic behavior allowing such elongations without permanent deformation can be achieved by a judicious choice of the material and a design adapted to the active part of the element. The critical temperature may vary depending on the choice of material. In the case of application to bottle valves, since these usually operate at ambient temperatures generally between 0 ° C and 30 ° C, the critical threshold will be at least approximately at about 100 ° C, 120 ° C or 150 ° C. The closure device must remain open in a fairly wide temperature range, for example between -40 ° C and + 70 ° C to cover extreme temperatures in which the faucet may have to operate normally.
[0038] Notamment en cas d'application oxygène et lors de l'ouverture de la vanne de fermeture/ouverture 26 du robinet, la mise en pression du passage de gaz compris entre ladite vanne et le détendeur 12 pourra donner lieu de manière transitoire à des compressions adiabatiques susceptibles de générer des augmentations de température et d'initier des combustions à l'intérieur du corps de la vanne. Une telle combustion peut être rendue possible par la présence de résidus ou d'impuretés dans la vanne dans des matériaux combustibles.  Particularly in the case of oxygen application and during the opening of the valve closing / opening 26 of the valve, the pressurization of the gas passage between said valve and the expander 12 may give rise to transiently to adiabatic compressions likely to generate temperature increases and initiate combustion inside the body of the valve. Such combustion can be made possible by the presence of residues or impurities in the valve in combustible materials.
[0039] En cas de combustion, les flammes peuvent sortir du robinet notamment en raison du flux important d'oxygène. La présence d'un dispositif automatique de fermeture ou au moins de réduction du passage de gaz permet de garantir au robinet un certain niveau de sécurité face à cette problématique restée jusqu'à lors sans réelle solution. En effet, en cas de début de combustion lors de l'ouverture de la vanne 26, l'élément en alliage à mémoire de forme va très rapidement s'échauffer et dépasser son seuil critique. Il va alors en un temps très court directement lié à son inertie thermique se déformer et venir en contact avec la paroi interne de la cavité. Ce contact va fermer le passage de gaz, en l'occurrence d'oxygène, et, partant, stopper les flammes.  In case of combustion, the flames can leave the valve especially because of the large flow of oxygen. The presence of an automatic closure device or at least reduction of the gas passage ensures the tap a certain level of security against this problem remained until then without any real solution. Indeed, in the case of the start of combustion during the opening of the valve 26, the shape memory alloy element will very quickly heat up and exceed its critical threshold. It then goes in a very short time directly linked to its thermal inertia become deformed and come into contact with the inner wall of the cavity. This contact will close the passage of gas, in this case oxygen, and thus stop the flames.
[0040] Il est à noter que le contact entre le bord extérieur de la partie active de l'élément en alliage à mémoire de forme et la surface interne de la cavité peut ne pas être parfaitement étanche, notamment en fonction de l'état de surface de cette partie active et de l'état de la surface interne correspondante de la cavité. Le dispositif pourra par conséquent être un dispositif de réduction ou diminution du passage du gaz et non un dispositif de fermeture totale.  It should be noted that the contact between the outer edge of the active part of the shape memory alloy element and the inner surface of the cavity may not be perfectly sealed, in particular depending on the state of surface of this active part and the state of the corresponding inner surface of the cavity. The device may therefore be a device for reducing or reducing the passage of the gas and not a total closure device.
[0041] La cavité 14 débouche en amont sur un filtre 20 disposé dans un raccord 22. Le gaz traversant la cavité 14 va par conséquent rencontrer un premier rétrécissement générateur de pertes de charges formé par le filtre et un second rétrécissement directement en aval au niveau du siège du détendeur. Les pertes de charges formées par ces éléments vont accentuer l'onde de choc au niveau du gaz lors de l'ouverture de la vanne de fermeture/ouverture. Cette onde de choc va naître dans la cavité 14. Le positionnement de la partie active du dispositif de fermeture dans cette cavité et à proximité du filtre et du siège du détendeur permet de réduire au minimum le temps de réponse du dispositif et, partant, son efficacité. The cavity 14 opens upstream on a filter 20 disposed in a connector 22. The gas passing through the cavity 14 will therefore encounter a first loss-generating shrinkage formed by the filter and a second shrinkage directly downstream at the the seat of the regulator. The losses of charges formed by these elements will accentuate the shock wave at the gas when opening the closing / opening valve. This shock wave will be born in the cavity 14. The positioning of the active part of the closure device in this cavity and in the vicinity of the filter and the seat of the regulator makes it possible to minimize the response time of the device and, consequently, its efficiency.
[0042] En référence à la remarque faite plus haut à un dispositif de réduction de la section de passage, il est à noter qu'en fonction de l'application et de ses paramètres, un tel dispositif se limitant à réduire sensiblement, par exemple d'au moins 70%, préférentiellement 80%, plus préférentiellement encore 90%, la section de passage pourra également augmenter la sécurité du robinet en limitant de manière notoire la propagation des flammes en dehors du robinet.  In reference to the remark made above to a reduction device of the passage section, it should be noted that depending on the application and its parameters, such a device is limited to substantially reduce, for example of at least 70%, preferably 80%, more preferably 90%, the passage section may also increase the safety of the valve by significantly limiting the spread of flames outside the valve.
[0043] La figure 3 illustre le dispositif de fermeture de la figure 1 avec toutefois un design de l'élément en alliage à mémoire de forme différent au niveau de la partie active ou tête de l'élément. Ce dernier 16 comprend une première partie active 161 en forme de dôme et une deuxième partie généralement cylindrique 162. La cavité 14 est généralement cylindrique avec une première zone 141 d'un premier diamètre donné et dans laquelle la partie active 161 de l'élément est située. La cavité 14 comprend également une deuxième zone 142 directement adjacente à la première zone et en connexion fluidique avec cette dernière. La deuxième zone présente un diamètre inférieur à celui de la première. La partie en forme de dôme 161 de l'élément 16 est orientée de manière à ce que sa partie creuse soit orientée vers la deuxième zone 142 de la cavité 14. La cavité 14 est alimentée en gaz radialement au niveau de la deuxième zone 142. Le gaz s'écoule donc en contournant la partie arrière et le bord extérieur de la partie en forme de dôme.  Figure 3 illustrates the closure device of Figure 1 with however a design of the different shape memory alloy element at the active part or head of the element. The latter 16 comprises a first active part 161 in the form of a dome and a second generally cylindrical part 162. The cavity 14 is generally cylindrical with a first zone 141 of a given first diameter and in which the active part 161 of the element is located. The cavity 14 also comprises a second zone 142 directly adjacent to the first zone and in fluidic connection with the latter. The second zone has a diameter smaller than that of the first. The domed portion 161 of the member 16 is oriented so that its hollow portion is oriented toward the second zone 142 of the cavity 14. The cavity 14 is supplied with gas radially at the second zone 142. The gas thus flows bypassing the back and the outer edge of the domed portion.
[0044] La partie cylindrique 162 de l'élément 16 se termine par un filetage mâle 163 engagé dans un filetage femelle pratiqué dans une troisième zone 143 de la cavité 14. Les trois zones 141 , 142 et 143 de la cavité 14 sont concentriques.  The cylindrical portion 162 of the element 16 ends with a male thread 163 engaged in a female thread made in a third zone 143 of the cavity 14. The three zones 141, 142 and 143 of the cavity 14 are concentric.
[0045] Lors de l'ouverture de la vanne de fermeture/ouverture et en cas de combustion provoquée par l'onde de choc adiabatique, la température dans la première zone 141 de la cavité 14 va augmenter. La partie active en forme de dôme 161 de l'élément 16 verra sa température augmenter et va se déformer pour prendre la forme illustrée à la figure 4. Le dôme 161 s'est aplati et son diamètre extérieur a augmenté de manière à être en contact avec la surface intérieure de la cavité 14. Cette déformation super élastique permet ainsi que fermer le passage de gaz et de stopper net la combustion. De plus la forme en dôme ou parapluie de cette partie, orientée de manière à ce que son creux soit orienté côté amont du débit de gaz, permet à cette partie de se déformer d'avantage dans le sens de la fermeture sous l'effet de l'onde de choc provoquée par sa déformation. When opening the closing valve / opening and in case of combustion caused by the adiabatic shock wave, the temperature in the first zone 141 of the cavity 14 will increase. The dome-shaped active part 161 of the element 16 will increase in temperature and will deform to take the form shown in FIG. 4. The dome 161 has flattened and its outside diameter has increased so as to be in contact with each other. with the inner surface of the cavity 14. This super elastic deformation thus allows the gas passage to be closed and the combustion to be stopped. In addition, the dome or umbrella shape of this part, oriented so that its hollow is oriented upstream of the gas flow, allows this part to deform further in the direction of closure under the effect of the shock wave caused by its deformation.
[0046] Il est à noter que les éléments en alliage à mémoire de forme qui sont illustrés aux figures 1 , 3 et 4 sont purement exemplatifs. Ils peuvent prendre diverses formes autres que celles illustrées.  It should be noted that the shape memory alloy elements which are illustrated in Figures 1, 3 and 4 are purely illustrative. They may take various forms other than those illustrated.
Liste des signes de référence  List of reference signs
[0047 2 : robinet bouteille  [0047 2: faucet bottle
[0048 4 : corps  [0048 4: body
[0049 6 : filetage mâle  [0049 6: male thread
[0050 8 : entrée de gaz  [0050 8: gas inlet
[0051 10 : passage de gaz  [0051] Gas passage
[0052 12 : détendeur  [0052 12: Expansion valve
[0053 14 : cavité  [0053] Cavity
[0054; 141 : première zone de la cavité 14  [0054; 141: first zone of the cavity 14
[0055 142 : deuxième zone de la cavité 14  [0055] 142: second zone of the cavity 14
[0056 143 :troisième zone de la cavité 14  [0056] 143: third zone of the cavity 14
[0057 16 : élément en alliage à mémoire de forme  [0057 16: alloy element with shape memory
[0058 161 : partie active en forme de dôme de l'élément 16  [0058 161: dome-shaped active part of the element 16
[0059 162 : partie allongée de l'élément 16  [0059 162: elongate part of the element 16
[0060 163 : filetage mâle de la partie allongée 162 de l'élément 16  [0060 163: male thread of the elongate portion 162 of the element 16
[0061 20 filtre  Filter
[0062 22 siège de détendeur et support de filtre  [0062 22 pressure regulator seat and filter support
[0063 24 volant de commande de la vanne de fermeture/ouverture  [0063 24 control wheel of the closing / opening valve
[0064; 26 vanne de fermeture/ouverture  [0064; 26 closing / opening valve

Claims

Robinet bouteille pour gaz sous pression, comprenant Bottle valve for pressurized gas, including
un corps avec une entrée de gaz, une sortie de gaz et un passage de gaz reliant l'entrée avec la sortie ; a body with a gas inlet, a gas outlet and a gas passage connecting the inlet with the outlet;
une vanne de fermeture et d'ouverture du passage de gaz ; a valve for closing and opening the gas passage;
caractérisé en ce qu'il comprend, en outre characterized in that it further comprises
un dispositif de réduction ou de fermeture du passage en réaction à une élévation de température, ce dispositif étant disposé dans le corps en aval de la vanne de fermeture. a device for reducing or closing the passage in reaction to a rise in temperature, this device being arranged in the body downstream of the closing valve.
Robinet bouteille selon la revendication 1 , caractérisé en ce qu'il comprend un détendeur disposé en aval du dispositif de réduction ou de fermeture du passage, préférentiellement dans le corps du robinet. Bottle tap according to claim 1, characterized in that it comprises a regulator disposed downstream of the device for reducing or closing the passage, preferably in the body of the tap.
Robinet bouteille selon l'une des revendications 1 et 2, caractérisé en ce que le dispositif de réduction ou de fermeture du passage est configuré pour réduire ou fermer le passage de gaz lorsque la température dans le passage de gaz dépasse 100° C, préférentiellement 120°C, plus préférentiellement encore 150°C. Bottle valve according to one of claims 1 and 2, characterized in that the device for reducing or closing the passage is configured to reduce or close the gas passage when the temperature in the gas passage exceeds 100° C, preferably 120 °C, more preferably still 150°C.
Robinet bouteille selon l'une des revendications 1 à 3, caractérisé en ce que le dispositif de réduction ou de fermeture du passage est mécanique. Bottle tap according to one of claims 1 to 3, characterized in that the device for reducing or closing the passage is mechanical.
Robinet bouteille selon l'une des revendications 1 à 4, caractérisé en ce que le dispositif de réduction ou de fermeture du passage comprend un élément en alliage à mémoire de forme apte à se déformer lorsque sa température dépasse un niveau prédéfini. Bottle tap according to one of claims 1 to 4, characterized in that the device for reducing or closing the passage comprises a shape memory alloy element capable of deforming when its temperature exceeds a predefined level.
Robinet bouteille selon la revendication 5, caractérisé en ce que l'élément en alliage à mémoire de forme a un effet mémoire uniquement lors d'une élévation de température. Bottle tap according to claim 5, characterized in that the shape memory alloy element has a memory effect only when the temperature rises.
7. Robinet bouteille selon l'une des revendications 5 et 6, caractérisé en ce que le dispositif de réduction ou de fermeture du passage est configuré de manière à ce que la déformation de l'élément en alliage à mémoire de forme opère directement la réduction ou la fermeture du passage. 7. Bottle tap according to one of claims 5 and 6, characterized in that the device for reducing or closing the passage is configured so that the deformation of the shape memory alloy element directly causes the reduction or closing the passage.
8. Robinet bouteille selon l'une des revendications 5 et 6, caractérisé en ce que l'élément en alliage à mémoire de forme comprend une partie déformable avec un bord circulaire apte à coopérer avec une surface fixe, préférentiellement formée directement dans le corps, de manière à réduire ou fermer le passage. 8. Bottle tap according to one of claims 5 and 6, characterized in that the shape memory alloy element comprises a deformable part with a circular edge capable of cooperating with a fixed surface, preferably formed directly in the body, so as to reduce or close the passage.
9. Robinet bouteille selon la revendication 8, caractérisé en ce que la partie déformable de l'élément en alliage à mémoire de forme présente une forme générale de dôme. 9. Bottle tap according to claim 8, characterized in that the deformable part of the shape memory alloy element has a general dome shape.
10. Robinet bouteille selon l'une des revendications 8 et 9, caractérisé en ce que le diamètre du bord circulaire augmente lorsque sa température dépasse le niveau prédéfini, préférentiellement de plus de 10% au-delà de 100° C, 120°C, ou encore 150°C. 10. Bottle tap according to one of claims 8 and 9, characterized in that the diameter of the circular edge increases when its temperature exceeds the predefined level, preferably by more than 10% beyond 100° C, 120° C, or even 150°C.
1 1. Robinet bouteille selon l'une des revendications 8 à 10, caractérisé en ce que l'élément en alliage à mémoire de forme comprend une partie généralement allongée attachée à la partie déformable, la partie généralement allongée assurant la fixation de l'élément au corps. 1 1. Bottle tap according to one of claims 8 to 10, characterized in that the shape memory alloy element comprises a generally elongated part attached to the deformable part, the generally elongated part ensuring the fixing of the element to the body.
12. Robinet bouteille selon la revendication 1 1 , caractérisé en ce que la partie généralement allongée comprend un filetage mâle coopérant avec un filetage femelle correspondant dans le corps. 12. Bottle valve according to claim 1 1, characterized in that the generally elongated part comprises a male thread cooperating with a corresponding female thread in the body.
13. Robinet bouteille selon l'une des revendications 8 à 12, caractérisé en ce que le dispositif de réduction ou de fermeture du passage comprend une cavité cylindrique avec une première zone d'un premier diamètre recevant la partie déformable de l'élément en alliage à mémoire de forme et une deuxième zone d'un deuxième diamètre inférieur au premier et en amont de la première zone, de manière à ce que l'écoulement de gaz de service doivent contourner le bord extérieur circulaire de la partie en forme de dôme. 13. Bottle tap according to one of claims 8 to 12, characterized in that the device for reducing or closing the passage comprises a cylindrical cavity with a first zone of a first diameter receiving the deformable part of the alloy element with shape memory and a second zone of a second diameter less than the first and upstream of the first zone, so that the service gas flow must bypass the circular outer edge of the domed portion.
14. Robinet bouteille selon la revendication 13, caractérisé en ce que la partie déformable de l'élément en alliage à mémoire de forme est en forme de dôme avec un bord extérieur circulaire, disposé dans la cavité de manière à ce que le creux du dôme soit dirigé vers la deuxième zone de la cavité. 14. Bottle tap according to claim 13, characterized in that the deformable part of the shape memory alloy element is in the shape of a dome with a circular outer edge, arranged in the cavity so that the hollow of the dome is directed towards the second zone of the cavity.
15. Robinet bouteille selon l'une des revendications 13 et 14, caractérisé en ce que la cavité comprend une troisième zone adjacente à la première zone et opposée à la première, avec des moyens de fixation de l'élément en alliage à mémoire de forme, préférentiellement un filetage femelle. 15. Bottle tap according to one of claims 13 and 14, characterized in that the cavity comprises a third zone adjacent to the first zone and opposite the first, with means for fixing the shape memory alloy element , preferably a female thread.
EP12707082.9A 2011-03-07 2012-02-29 Cylinder valve having a device for reducing or closing off the flow in the event of a rise in temperature Withdrawn EP2683978A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU91795A LU91795B1 (en) 2011-03-07 2011-03-07 Bottle valve with device for reducing or closing the passage in case of temperature rise
PCT/EP2012/053435 WO2012119901A1 (en) 2011-03-07 2012-02-29 Cylinder valve having a device for reducing or closing off the flow in the event of a rise in temperature

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EP2683978A1 true EP2683978A1 (en) 2014-01-15

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US (1) US9151402B2 (en)
EP (1) EP2683978A1 (en)
CA (1) CA2829815A1 (en)
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WO (1) WO2012119901A1 (en)

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WO2012119901A1 (en) 2012-09-13
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US20140053921A1 (en) 2014-02-27
CA2829815A1 (en) 2012-09-13

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