EP3858443A1 - Sicherheitsvorrichtung mit thermischer auslösung - Google Patents

Sicherheitsvorrichtung mit thermischer auslösung Download PDF

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Publication number
EP3858443A1
EP3858443A1 EP21152584.5A EP21152584A EP3858443A1 EP 3858443 A1 EP3858443 A1 EP 3858443A1 EP 21152584 A EP21152584 A EP 21152584A EP 3858443 A1 EP3858443 A1 EP 3858443A1
Authority
EP
European Patent Office
Prior art keywords
safety device
cage
slide
axial
severed
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Withdrawn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
EP21152584.5A
Other languages
English (en)
French (fr)
Inventor
Pierre-Antoine Guenot
Nicolas Faivre
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.)
Schrader SA
Original Assignee
Schrader 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 Schrader SA filed Critical Schrader SA
Publication of EP3858443A1 publication Critical patent/EP3858443A1/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
    • A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
    • A62C37/42—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with mechanical connection between sensor and actuator, e.g. rods, levers
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
    • A62C37/46—Construction of the actuator
    • A62C37/48—Thermally sensitive initiators

Definitions

  • the present invention relates to a thermal trigger safety device.
  • thermal trigger devices are used in particular to secure pipelines or pressurized fluid reservoirs. In fact, it is necessary to use heat-sensitive means to release the pressurized fluid in the event of a fire and thus limit the risks of explosion.
  • EP3169920A1 shows a system comprising a pipe made of fusible material at a determined temperature, the pipe containing a pressurized control fluid.
  • the line is connected to a safety valve which opens when the material in the line melts, releasing the control fluid contained in the line.
  • the present invention aims to provide a safety device which does not require the use of fusible material and which is easy to implement, reliable, and economical.
  • the invention makes it possible to very quickly trigger the sectioning of the element to be sectioned, at a predetermined trigger temperature. It is possible to use this safety device in many applications. It suffices for the element to be severed to be arranged in such a way as to trigger an operation for securing a system.
  • the figures 1 to 5 illustrate a first embodiment of the safety device 10 according to the invention.
  • the safety device 10 is provided for cutting an element to be severed 12 constituted here by a pipe 14 in the event of an abnormal temperature rise, for example in the event of a fire.
  • This pipe contains, for example, a pressurized liquid and it can be connected to a safety valve such as that described in the document EP3169920A1 , in order to allow the opening of a pressurized fluid reservoir (not shown).
  • the safety device 10 can be arranged in an electrical cabinet to cut a pipe containing a fluid capable of extinguishing a fire in the electrical cabinet.
  • the invention makes it possible to cut other types of elements, for example a control cable or the like.
  • the safety device 10 comprises a cage 16, here of cylindrical or tubular shape, which extends in an axial direction A1.
  • the cage 16 is provided, in a middle section 17, with a transverse passage 18 intended to be crossed by the element to be severed 12.
  • the transverse passage 18 comprises two openings 20, 22 which are arranged opposite each other on the axial wall 24 of the cage 16.
  • each opening 20, 22 is delimited by a bevelled edge 26, 28 thus forming a cutting edge suitable in severing the element to be severed 12.
  • each opening 20, 22 has an oblong shape which stretches in an axial direction, parallel to the axis A1 of the cage 16. This oblong shape allows a relative axial displacement of the slide 32 in cage 16 before the element to be severed comes into contact with the bevelled edges 26, 28.
  • the safety device 10 also comprises a slide 32 which is mounted to slide axially inside the cage 16.
  • the slide 32 here has a generally cylindrical shape with an external diameter substantially equal to the internal diameter of the cage 16, at least in its middle section 17.
  • the slider 32 here comprises a duct 34 which passes right through the body of the slider 32, generally transversely.
  • the duct 34 is of sufficient diameter to allow the passage of the element to be severed 12.
  • the conduit 34 opens out respectively vis-à-vis each opening 20, 22 of the transverse passage 18, so that the element to be cut can pass through the cage 16 and the slide 32.
  • the duct 34 extends in a direction A2 which is inclined with respect to a direction T1 transverse to the axis A1 of the cage 16.
  • the inclination angle a1 is for example between 5 and 20 degrees. .
  • the slider 32 is held axially in its rest position, on one side by an elastic return element 36, and on the other by a thermal release unit 38.
  • the elastic return element 36 is arranged in a first section. axial end section, said upstream section 40, of the cage 16, and the thermal trigger unit 38 is arranged in a second axial end section, called downstream section 42, of the cage 16.
  • the upstream section 40 and the downstream section 42 are arranged on either side of the middle section 17 comprising the openings 20, 22.
  • the elastic return element 36 is constituted by a helical spring which is retained upstream by a pin 44 inserted transversely in the cage 16.
  • the elastic return element 36 is mounted compressed axially between the face. upstream transverse 46 of the slide 32 and the pin 44.
  • the upstream transverse face 46 of the slide comprises a shoulder 48 which serves as a bearing surface for the downstream axial end 50 of the elastic return element 36 .
  • the thermal tripping unit 38 is here constituted by a burstable body.
  • the burstable body is for example constituted by a glass cartridge 52 containing a lining with a high thermal expansion coefficient so that the cartridge bursts when the surrounding temperature, or local temperature, exceeds a predetermined threshold value.
  • This type of burstable body is already used in smoke and heat evacuation systems, or to automatically trigger fire extinguishers or the projection of a liquid intended to extinguish a fire in a building.
  • burstable bodies are very reliable over time and that they therefore allow reliable triggering at a well determined temperature.
  • the cartridge 52 has a generally cylindrical shape coaxial with the cage 16.
  • the cartridge 52 comprises a base 54 of hemispherical shape arranged on the downstream side and a pointed apex 56 arranged on the upstream side.
  • the cage 16 comprises a downstream transverse wall 58 provided on its upstream face with a hemispherical cavity 60 complementary to the external surface of the base 54, which makes it possible to retain the cartridge 52 radially in the cage 16 on the downstream side, when the slide 32 is in the rest position.
  • the downstream transverse face of the slide 32 comprises a housing 62 provided to receive a portion of the top 56 of the cartridge 52.
  • This housing 62 here has the shape of a cylindrical orifice, or bore, the external diameter of which is slightly less than the external diameter of the cartridge 52 to allow the cartridge 52 to be held radially in the cage 16 on the upstream side, when the slide 32 is in the rest position.
  • the cage 16 also comprises several windows 64, here of oblong shapes, arranged in the downstream section 42 of the cage 16. This allows the downstream section 42 to be perforated at the level of the thermal trigger unit 38 to facilitate high temperature detection, thus allowing the cartridge 52 to burst as soon as the temperature rises near the safety device 10 above the threshold temperature.
  • a support plate 66 which makes it possible to fix the safety device 10 on a wall, for example the wall of a reservoir containing a pressurized fluid, or any other wall.
  • the support plate 66 here comprises a plate 68 which is parallel to the axis A1 of the cage 16.
  • the plate 68 is provided, on its face on the side of the safety device 10, with a first pair of fixing elements. 70, 72 provided to hold the safety device 10, and a second pair of fasteners 74, 76 provided to hold the element to be severed 12.
  • the first pair of fasteners 70, 72 here comprises end tongues 78, 80 which retain the cage 16 axially and side tongues 82, 84 which retain the cage 16 transversely.
  • the second pair of fixing elements 74, 76 here comprises clips 86, 88 in the shape of a "C" which retain the element to be severed 12, here the pipe 14, by elastic interlocking.
  • the plate 68 has an overall cross shape, the branches of which extend respectively under the cage 16 and under the element to be severed 12.
  • the plate 68 comprises opposite the section downstream 42 of the cage 16, a window 90 which has substantially the same role as the windows 64 arranged in the downstream section 42, that is to say to facilitate the detection of high temperature by the thermal detection unit 38.
  • the slide 32 first causes a first sectioning S1 of the pipe 14 against the downstream part of a first bevelled edge 26 of the opening 20.
  • the slide 32 continues its axial movement downstream, under the pressure of the elastic return element 36, and thus causes a second sectioning S2 of the pipe 14 against the downstream part of a second bevelled edge 28 of the opening 22, on the side opposite to the first sectioning S1.
  • the pipe 14 is cut at two points S1, S2, on either side of the cage 16. This guarantees reliable and total venting, within a very short time. , of the pipe 14.
  • the fact that the two sectioning points S1 and S2 are produced in part sequentially makes it possible to ensure that the force required for sectioning will not be too high compared to the force of the elastic return element. 36, and / or depending on the quality of the cutting edge of the bevelled edges 26, 28, and / or depending on the hardness of the material used for the pipe 14.
  • the axis T1 of the duct 34 arranged in the slide 32 may be transverse to the axis A1 of the cage 16.
  • the two sectioning points S1, S2 are carried out simultaneously after the explosion of the cartridge 42.
  • the relative axial displacement of the slide 32 relative to the cage 16, thanks to the oblong shape of the openings 20, 22, makes it possible to compensate for axial displacements linked to a local deformation of the cartridge 52 and / or of the element. elastic return 36. Such a deformation may be due to temperature variations below the threshold value.
  • the cage 16 is preferably made of metal by cutting (for the windows 64 and the openings 20, 22) and by deep drawing. This makes it possible to produce the main body of the cage 16 in a single piece, in particular the downstream transverse wall 58 with the axial wall 24.
  • the pin 44 can also be made of metal and inserted transversely by force into appropriate bores.
  • the solution of the pin 44 can be replaced by a deformation of the upstream end edge 92 of the cage 16 to form an upstream transverse wall 94 capable of axially retaining the elastic return element 36 on the upstream side.
  • the rest of the structure and the operation of the safety device 10 are not modified.
  • the cage 16 can be closed on the upstream side and the upstream transverse wall 94 can be made in one piece with the main body of the cage 16.
  • the downstream transverse wall 58 is formed by a plug 96. which can be force-fitted in the main body of the cage 16 through an opening 98 made downstream.
  • the cage 16 of the third embodiment can be made of plastic material by injection into a mold.
  • the main body of the cage 16 can be shortened on the upstream side, relative to the cage 16 of the first embodiment.
  • the upstream section 40 is made in two parts.
  • a downstream part 100 is made in one piece with the main body of the cage 16.
  • An upstream part 102 forms a cover which is mounted on the downstream part 100 so that the elastic return element 36 is housed at the same time. in the downstream part 100 and in the upstream part 102.
  • the upstream part 102 is closed upstream which forms the upstream transverse wall 94 to retain the elastic return element 36.
  • the upstream part 102 is retained axially on the downstream part 100 by means of a metal ring 104.
  • the metal ring 104 is received in a first peripheral groove 106 of the upstream part 102 and in a second peripheral groove 108 of the downstream part 100.
  • the main body of the cage 16 can be closed at each axial end by an attached part.
  • the insert can be press-fitted or screwed on.
  • the main body of the cage 16 can be produced by machining, for example of metal, for example of aluminum.
  • the main body of the cage 16 can be machined and the elastic return element 36 retained by a pin 44.
  • the fourth embodiment with the upstream section 40 of the main body of the cage 16 in two parts can be made of metal or plastic, by stamping or by molding or by machining.
  • the safety device 10 finds an application in the securing of reservoirs containing a pressurized fluid.
  • the element to be severed 12 may be a cable which, when severed, releases a jack or spring provided to open a smoke outlet or a trap door.

Landscapes

  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Safety Valves (AREA)
  • Connection Of Batteries Or Terminals (AREA)
EP21152584.5A 2020-01-31 2021-01-20 Sicherheitsvorrichtung mit thermischer auslösung Withdrawn EP3858443A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2000951A FR3106758B1 (fr) 2020-01-31 2020-01-31 Dispositif de securite a declenchement thermique

Publications (1)

Publication Number Publication Date
EP3858443A1 true EP3858443A1 (de) 2021-08-04

Family

ID=70228261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21152584.5A Withdrawn EP3858443A1 (de) 2020-01-31 2021-01-20 Sicherheitsvorrichtung mit thermischer auslösung

Country Status (2)

Country Link
EP (1) EP3858443A1 (de)
FR (1) FR3106758B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3127537B1 (fr) 2021-09-28 2023-11-17 Schrader Tendeur pour un câble équipant une installation de déclenchement d’un organe de sécurité

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101506575B1 (ko) * 2014-09-02 2015-03-27 강운공업주식회사 보존형 발전유닛이 구비된 고체 에어로졸 소화장치
EP3169920A1 (de) 2014-07-17 2017-05-24 Schrader Sicherheitsventil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3169920A1 (de) 2014-07-17 2017-05-24 Schrader Sicherheitsventil
KR101506575B1 (ko) * 2014-09-02 2015-03-27 강운공업주식회사 보존형 발전유닛이 구비된 고체 에어로졸 소화장치

Also Published As

Publication number Publication date
FR3106758A1 (fr) 2021-08-06
FR3106758B1 (fr) 2023-05-05

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