WO2005028932A1 - Dispositif de sécurité pour conduites de gaz - Google Patents

Dispositif de sécurité pour conduites de gaz Download PDF

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Publication number
WO2005028932A1
WO2005028932A1 PCT/EP2004/007212 EP2004007212W WO2005028932A1 WO 2005028932 A1 WO2005028932 A1 WO 2005028932A1 EP 2004007212 W EP2004007212 W EP 2004007212W WO 2005028932 A1 WO2005028932 A1 WO 2005028932A1
Authority
WO
WIPO (PCT)
Prior art keywords
safety device
shut
bimetallic snap
snap disk
thermal
Prior art date
Application number
PCT/EP2004/007212
Other languages
German (de)
English (en)
Inventor
Andreas Weise
Michael Kerkmann
Klaus Weyer
Karl-Heinz Lentz
Original Assignee
L + T Gasetechnik Klöpper-Waldmann Gmbh & Co. Kg
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 L + T Gasetechnik Klöpper-Waldmann Gmbh & Co. Kg filed Critical L + T Gasetechnik Klöpper-Waldmann Gmbh & Co. Kg
Publication of WO2005028932A1 publication Critical patent/WO2005028932A1/fr

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
    • 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
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C4/00—Flame traps allowing passage of gas but not of flame or explosion wave
    • A62C4/02—Flame traps allowing passage of gas but not of flame or explosion wave in gas-pipes

Definitions

  • the invention relates to a safety device for automatically shutting off gas lines, with a shut-off element which is assigned to a thermal after-flow lock of the safety device, a release mechanism acting on the shut-off element such that the shut-off element is moved from an open position into a shut-off position when a predetermined temperature value is exceeded ,
  • Such safety devices are mainly used in gas lines of gas supply systems for fuel gases, oxygen or compressed air. For example, they are installed downstream on gas cylinders or on extraction valves and upstream on torches for welding, cutting and related processes.
  • the safety devices usually used include a gas return valve, which prevents gas from flowing back against the intended flow direction.
  • Safety devices that also have a flame arrester are used in gas lines for combustible gases. The flame arrester prevents a flame from striking against the direction of flow of the gas line.
  • so-called post-flow barriers in particular thermal post-flow barriers, are generally used, which automatically interrupt the gas supply when a specified temperature value is reached or exceeded.
  • the technical requirements for such safety devices are regulated in the European standard EN 730.
  • Thermal afterflow barriers in known safety devices usually have a movable shut-off element, which in the shut-off position interrupts the gas flow through the safety device.
  • the shut-off element is held in the open position by a fusible link. If the temperature rises above the specified temperature value, the solder will melt, so that the shut-off element is released. The shut-off element is moved into the shut-off position by the force of a prestressed spring acting on the shut-off element, so that the gas flow is interrupted permanently.
  • thermal afterflow barriers described above of the safety devices known from the prior art are constructed in a comparatively complex manner, which results in correspondingly high production costs.
  • the triggering mechanism comprises a thermal bimetallic snap disk which changes its shape abruptly when the predetermined temperature value is exceeded.
  • the bimetallic snap disk of the safety device fulfills the function of a thermal control element, the shut-off element being moved from the open position into the shut-off position by the sudden change in shape of the bimetallic snap disk.
  • Thermobimetals are layer composite materials known per se, which consist of at least two components with different coefficients of expansion. Since one component expands more than the other when heated, the temperature-dependent curvature of the Thermobimetalles.
  • Thermobimetal materials suitable for use in accordance with the invention are advantageously commercially available at comparatively low costs.
  • thermobimetal snap effect can be achieved, for example by appropriate mechanical protrusion, while observing certain limiting conditions.
  • the temperature value at which the thermobimetal snap disc suddenly changes its shape can be predetermined within certain limits in the production of the thermobimetal snap disc.
  • This temperature value is also referred to as the snap point of the bimetallic snap disk. At the snap point, the bimetallic snap disk reaches an unstable stress state and changes from its original shape to another shape.
  • the shape-temperature characteristic of the thermal bimetallic snap disk used according to the invention is hysteresis-like, so that it is ensured that the safety device is not opened again when the temperature falls below the predetermined value.
  • An important safety requirement is that the safety device remains permanently shut off after the thermal post-flow blocker has been triggered.
  • Thermobimetal snap disks suitable for use in accordance with the invention can be purchased at low cost and can be used directly with little assembly effort. As a result, the manufacturing costs of the safety devices according to the invention are significantly reduced compared to the manufacturing costs of the previously customary safety devices.
  • the shut-off element of the safety device according to the invention is spherical and consists of heat-resistant elastomer material.
  • elastomeric material such as EPDM plastic
  • the shut-off element is heat-resistant, the shut-off element in particular temperatures below the predetermined temperature value at which the triggering mechanism responds to the thermal after-flow barrier. has to withstand.
  • the spherical shape of the shut-off element is advantageous so that even if the shut-off element moves in an imprecise manner from the open position into the shut-off position, it is ensured that the gas flow through the safety device is interrupted.
  • the spherical shape of the shut-off element is, as it were, self-centering, a corresponding opening on the housing of the safety device being kept reliably and tightly closed in the shut-off position by means of the spherical elastic shut-off element.
  • the thermal bimetallic snap disk of the safety device according to the invention can usefully be of essentially circular and dome-shaped design, in which case the spherical shut-off element is attached centrally to the thermal bimetallic snap disk.
  • the shut-off element and the bimetallic snap disk form a unit that is particularly easy to handle and can be inserted into the safety device according to the invention with minimal assembly effort.
  • the shut-off element executes a lifting movement from the open position into the shut-off position when the thermo bimetallic snap-on plate jumps over, in such a way that in the shut-off position it is pressed against an opening on the housing of the safety device and thus the gas flow through the safety device is interrupted.
  • the circular and dome-shaped design of the thermobimetal snap disk described above is particularly suitable for this purpose.
  • a seat opposite the opening for the thermal bimetallic snap disk must then be provided, on which the thermal bimetal snap disk is supported after the thermal after-flow barrier has been triggered. It makes sense if the bimetallic snap disk is arranged essentially perpendicular to the gas flow direction.
  • the safety device according to the invention should have a flame arrester with a sintered metal element.
  • the flame arrester prevents a flame from striking against the normal direction of gas flow.
  • the good thermal conductivity and the large surface area of the sintered metal element due to the porosity leads to the extinguishing of flames hitting the gas lines.
  • the thermal bimetallic snap disk of the safety device according to the invention can expediently be arranged downstream of the flame arrester. This leads to the thermal post-flow lock of the safety device being triggered without delay.
  • the safety device it also makes sense for the safety device according to the invention to have a coaster valve, by means of which the backflow of gas against the normally provided direction of flow is prevented.
  • the return valve is kept open by the gas flow flowing through the safety device in the intended direction and closes when the pressure downstream of the safety device reaches or exceeds the inflow pressure of the gas present at the safety device.
  • the coaster valve is expediently arranged upstream of the flame arrester. In this way, it is prevented that the coaster valve is damaged by flames penetrating against the intended flow direction.
  • the thermal bimetallic snap disk of the safety device according to the invention is designed such that it does not spring back into its original shape when the temperature falls below the predetermined value. It has already been mentioned above that it is an essential safety requirement for a safety device of the type according to the invention that the thermal after-flow barrier permanently interrupts the gas flow after the one-time response.
  • Figure 2 safety device with triggered thermal afterflow barrier.
  • the safety device shown in the figures has a tubular housing 1.
  • the intended gas flow direction is indicated by arrows 2.
  • a thread 3 is attached to the housing 1 at the inflow end.
  • the housing 1 has an internal thread 4, into which a bush 5 is screwed.
  • a central opening 6 of the socket 5 forms the outflow opening of the safety device.
  • a shut-off element 7 is arranged in the area of the outflow opening 6, which is assigned to a thermal after-flow barrier of the safety device.
  • the spherical shut-off element 7 is in the open position in FIG. 1. In this position, the gas can flow freely through the safety device.
  • FIG. 2 shows the state of the safety device with a thermal post-flow block triggered due to the exceeding of a predetermined temperature value.
  • the shut-off element 7 is in the shut-off position.
  • the shut-off element 7 in the shut-off position, the shut-off element 7, as can be clearly seen in FIG. 2, is pressed against the opening 6, so that the gas flow through the safety device is interrupted.
  • the triggering mechanism of the thermal post-flow lock comprises a thermobimetal snap disk 8. This jumps from the form shown in FIG. 1 to the form shown in FIG. 2 when the predetermined temperature value is exceeded.
  • the thermal bimetallic snap disk 8 is designed to be essentially circular and dome-shaped, and the spherical shut-off element 7 is attached centrally to the thermal bimetal snap disk 8.
  • the shut-off element 7 executes a lifting movement from the open position shown in FIG. 1 to the shut-off position shown in FIG. 2, so that, as shown in FIG. 2, the shut-off element 7 in the shut-off position against the Opening 6 is pressed.
  • the outer bimetallic snap disk is supported on the housing 1 with its outer circumference.
  • the bimetallic snap disk 8 is essentially perpendicular to the gas flow direction 2 arranged.
  • the gas flowing through the safety device flows laterally past the bimetallic snap disk 8 through channels 9.
  • the safety device shown in the figures has a sintered metal element 10 as a flame arrester.
  • a sieve insert 11 is inserted into the inflow opening of the housing 1 in order to prevent the penetration of foreign bodies which could impair the functionality of the safety device.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)

Abstract

L'invention concerne un dispositif de sécurité pour fermer automatiquement des conduites de gaz, ce dispositif comportant un élément de fermeture (7) associé à un verrou d'écoulement résiduel thermique du dispositif de sécurité. Sur l'élément de fermeture (7) agit un mécanisme de déclenchement, de sorte que l'élément de fermeture passe de la position ouverte à la position fermée lorsqu'une température donnée est dépassée. L'invention vise à améliorer un dispositif de sécurité de ce type et notamment à en réduire les coûts de fabrication. A cet effet, le mécanisme de déclenchement comprend une plaque encliquetable en bimétal thermique (8), laquelle change brusquement de forme lorsque la température donnée est dépassée.
PCT/EP2004/007212 2003-08-22 2004-07-02 Dispositif de sécurité pour conduites de gaz WO2005028932A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003139189 DE10339189A1 (de) 2003-08-22 2003-08-22 Sicherheitseinrichtung für Gasleitungen
DE10339189.4 2003-08-22

Publications (1)

Publication Number Publication Date
WO2005028932A1 true WO2005028932A1 (fr) 2005-03-31

Family

ID=34202042

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/007212 WO2005028932A1 (fr) 2003-08-22 2004-07-02 Dispositif de sécurité pour conduites de gaz

Country Status (2)

Country Link
DE (1) DE10339189A1 (fr)
WO (1) WO2005028932A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112969884A (zh) * 2018-10-29 2021-06-15 罗伯特·博世有限公司 用于气态介质的阀装置和用于储存压缩流体的箱装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600087779A1 (it) * 2016-08-29 2018-03-01 Jurop S P A Dispositivo fermafiamma

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1353958A (en) * 1970-09-30 1974-05-22 Roth A Welding or cutting torch with a safety device
DE2920397A1 (de) * 1979-05-19 1981-04-30 Zinser-Schweisstechnik Gmbh & Co, 7333 Ebersbach Vorrichtung zum verhindern des rueckschlagens einer flamme, insbesondere fuer einen schweiss- oder schneidbrenner
US4549717A (en) * 1983-03-07 1985-10-29 Leuven Research & Development Heat responsive valve
US20020145052A1 (en) * 2001-04-10 2002-10-10 Kevin Cessac Temperature actuated flow restrictor
US20020153057A1 (en) * 2001-04-18 2002-10-24 Intoximeters, Inc Bottle valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1353958A (en) * 1970-09-30 1974-05-22 Roth A Welding or cutting torch with a safety device
DE2920397A1 (de) * 1979-05-19 1981-04-30 Zinser-Schweisstechnik Gmbh & Co, 7333 Ebersbach Vorrichtung zum verhindern des rueckschlagens einer flamme, insbesondere fuer einen schweiss- oder schneidbrenner
US4549717A (en) * 1983-03-07 1985-10-29 Leuven Research & Development Heat responsive valve
US20020145052A1 (en) * 2001-04-10 2002-10-10 Kevin Cessac Temperature actuated flow restrictor
US20020153057A1 (en) * 2001-04-18 2002-10-24 Intoximeters, Inc Bottle valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112969884A (zh) * 2018-10-29 2021-06-15 罗伯特·博世有限公司 用于气态介质的阀装置和用于储存压缩流体的箱装置
US11512790B2 (en) 2018-10-29 2022-11-29 Robert Bosch Gmbh Valve device for a gaseous medium, and tank device for storing compressed fluids
CN112969884B (zh) * 2018-10-29 2023-09-05 罗伯特·博世有限公司 用于气态介质的阀装置和用于储存压缩流体的箱装置

Also Published As

Publication number Publication date
DE10339189A1 (de) 2005-03-24

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