Explosion panel and flame arrester incorporating such a panel

Abstract

Explosion panel (1) comprising a sheet (10) called a rupture sheet provided with a weakening zone (12) and a peripheral fixing frame (11), characterized in that it comprises at least one rigid element (3) which is fixed to the sheet (10) by being arranged in a median plane of the sheet and extending perpendicular to said sheet. The explosion panel can in particular be coupled with a flame arrester device. Fig. 1

Description

Title of the invention: Explosion panel and flame arrester device incorporating such a panel

[0001] The invention relates to an explosion panel and a flame arrester device incorporating such an explosion panel.

[0002] The invention will be described with regard to the integration of an explosion panel in a flame arrester device without however being limited thereto, and can be applied to any use of an explosion panel which can be mechanically connected in its middle part to a rigid structure opposite the enclosure for which the explosion panel is intended.

[0003] A flame arrester device is intended to be fixed to all storage enclosures without limitation, such as silos, hoppers, dryers, tanks, filtration systems, bucket elevators, etc., or to be fixed to material processing machines. These enclosures store powdery products or gases which under certain conditions are likely to cause an increase in pressure and temperature inside the enclosure, which can lead to an explosion and possibly to the release of flames.

[0004] Also, a flame arrester device incorporates a depressurization device which comprises an explosion panel capable of tearing in its weakened zone in the event of abnormal overpressure in the enclosure, the pressurized gas and possibly the flames then escaping through the tear hole in the panel. As for the flame arrester device, it comprises a hollow volume and a filter which surround the explosion panel; when this panel tears, the flame arrester device protects the environment from flames and burnt dust coming from the enclosure by stopping them via its filter. The flame arrester device also aims to weaken the pressure wave and reduce high temperatures.

[0005] The flame arrester device may have various geometries, for example parallelepipedal in shape or cylindrical in shape with a circular section, while the explosion panel which is associated with the base of the hollow volume of the flame arrester device then has a generally rectangular or circular shape.

[0006] In certain circumstances, the explosion panel may be subjected to pressure forces which are external to the enclosure with which the explosion panel is associated, which may tend to push on the panel which is in depression and deform it.

[0007] The invention therefore aims to propose a new explosion panel which is notably more resistant.

[0008] The invention relates to an explosion panel comprising a so-called rupture sheet provided with a weakening zone and a peripheral fixing frame, the explosion panel being characterized in that it comprises at least one rigid element which is fixed to the sheet by extending perpendicularly thereto, and by being arranged in the center of the sheet or by extending in a median plane of the sheet. Said at least one rigid element is intended to be fixed opposite the sheet to a rigid structure. Said at least one rigid element is intended to be fixed opposite the sheet to a rigid structure to connect the sheet rigidly and mechanically, to a rigid structure which is opposite the explosion panel and to the enclosure for which the explosion panel is intended.

[0009] By fixing at least one rigid element in the central or middle part of the sheet, it turns out that the explosion panel in the mounted position for its use and in its inactive (closed) state, resists depression forces much better. The explosion panel, by being mechanically linked in an orthogonal direction to a rigid structure which may for example be the structure of a flame arrester device, is much more robust and offers better resistance to the pressure forces which it could undergo from outside the enclosure for which said panel is intended. The explosion panel is not only fixed at its peripheral frame in the plane and around the sheet, but also in an opposite plane thanks to the rigid transverse connection element. In the event of depression in the enclosure, the sheet of the explosion panel resists pressure forces exerted from the outside much better.Furthermore, this arrangement of a rigid element in the central or middle part of the sheet of the explosion panel, generates an arrangement of the weakening zone, such that the sheet is intended to deploy towards the center providing a large discharge surface opposite and peripheral to the panel, which also makes it possible to direct the pressure discharge directly towards the filter when using the panel in a flame arrester device.

[0010] According to one feature, said at least one rigid element is fixed to the sheet at at least one fixing point. In particular, when the rigid element is fixed to the center of the sheet, it can be fixed at a single point which is exactly the center of the sheet, or it can be fixed at several points just around its center.

[0011] In a first embodiment, the explosion panel comprises a single rigid element which extends in the manner of a column and which is arranged in a localized manner in the center of the explosion panel sheet, and the weakening zone of the explosion panel sheet extends over the entire periphery of the sheet and the fixing frame. The folding hinge zone of the explosion panel sheet is located all around and at the foot of the central rigid element. Thus, the combination of the rigid central element and the arrangement of the weakening zone over the entire its periphery (and not just on one part), allows the explosion panel to open over its entire periphery while remaining attached to the central element, the sheet folding against and around it (like a flower closing its petals). In addition, this weakening over the entire periphery makes it possible to reduce the size of a flame arrester device intended to integrate the explosion panel of the invention. Indeed, the sheet folds towards the center against the rigid element, by the distance separating the periphery from the center, that is to say half of the sheet or the size of the radius for a circular panel, or at most the size of the diagonal of the sheet for a rectangular panel.Thus, the distance between the explosion panel and the opposite face of the rigid structure of the flame arrester device no longer needs to be as great as in the case of existing flame arresters, which results in a much more compact flame arrester device according to the invention.

[0012] According to one characteristic, in particular for the first embodiment, the sheet has a circular section and the weakening zone extends over 360° of the periphery.

[0013] According to one characteristic, in particular for the first embodiment, the sheet has a square or rectangular section and the weakening zone extends over the entire periphery, which is respectively square or rectangular.

[0014] In a second embodiment, the rigid element comprises a flange or a plate which extends perpendicular to the sheet and along a median line of the sheet, while the sheet has its weakened zone which extends at the periphery of the sheet and of the fixing frame along two opposite and facing lines without them meeting to provide two median solid zones in the plane of the rigid element. This design provides, when the panel is opened, two hinges opposite the foot and along the plate, the sheet opening in the form of two back-to-back leaves. In addition, the plate forms a stop surface preventing the leaves from hitting each other when they are deployed.

[0015] In yet another third embodiment, the explosion panel comprises at least two rigid elements which extend in the manner of two columns and which are spaced apart and arranged on a median line of the sheet, while the sheet has its weakening zone which extends at the periphery of the sheet along two opposite and facing lines without them meeting to provide two median solid zones in the plane of the rigid element. This design also provides two opposite hinges when the panel is opened, the sheet opening in the form of two back-to-back leaves. The two columnar elements form stop surfaces preventing the leaves from striking each other when they are deployed.

[0016] The second and third embodiments mentioned above also make it possible to save space for a flame arrester device incorporating a panel explosion of the invention because the sheet folds (in two leaves) towards the center against the rigid element(s), by the distance separating the periphery from the center, that is to say half of the sheet, and not in a single leaf (in a single piece) which would correspond to the entire width of the rupture sheet for a rectangular sheet or to the entire diameter of the sheet for a circular sheet.

[0017] According to one feature, said at least one rigid element is removably attached to the sheet. In particular, when the rigid element is column-shaped, it has at least one distal end which is threaded while the sheet comprises a welded nut for receiving said threaded end by screwing. In particular, when the rigid element comprises a plate, the sheet comprises mechanical connection parts such as welded tabs which are capable of being bolted to the plate.

[0018] According to another characteristic, the rigid element has a distal end opposite that fixed to the sheet, which comprises a mechanical connection fixing system, preferably a mechanical connection fixing system according to a male-female cooperation. In particular when the rigid element is in the form of a column, its distal end opposite that fixed to the sheet, is threaded (female cooperation part) in order to fix the rigid element to a rigid structure using a screw (male cooperation part) passing through said structure and screwing into the thread of the rigid element.

[0019] According to another characteristic, the rigid element has a distal end opposite that fixed to the sheet, which comprises a flared portion which widens towards said distal end. The flared portion may be a single piece of the body of the rigid element, or may be attached around the rigid element. The flared portion makes it possible in particular to ensure the rigidity of the central element while leaving room for the sheet of the explosion panel to deploy without being hindered in its travel.

[0020] According to another characteristic, the explosion panel, in particular when the rigid element has the shape of a column, comprises a spring which is arranged around the rigid element and at the distal end opposite that fixed to the sheet, the spring resting on a shoulder of the rigid element (and being intended to bear oppositely against the rigid structure for fixing the rigid element). The spring is intended to absorb the deformation of the rigid element in the event of excess pressure exerted on the sheet from the enclosure to which the explosion panel is fixed. The deformation of said rigid element has the function of contributing to deforming the sheet in its center to facilitate its rupture and allow the opening of the explosion panel.

[0021] The invention also relates to a flame arrester device which comprises an aforementioned explosion panel of the invention and a rigid structure delimiting with the explosion panel a hollow volume, said at least one rigid element being fixed to the rigid structure opposite the sheet, the flame arrester device being intended to be fixed on the outside and around an orifice of the enclosure to be protected with the explosion panel as an interface. Thus, said at least one rigid element is arranged in a median plane of the sheet of the explosion panel and extending perpendicularly thereto, and is fixed on the one hand to the sheet, and on the other hand to the rigid structure of the flame arrester device opposite the sheet. Said at least one rigid element therefore constitutes a rigid mechanical connection between the sheet and the structure of the flame arrester device (opposite the enclosure), which makes it possible to increase the resistance of the sheet to depression forces.

[0022] The present invention is now described with the aid of examples which are solely illustrative and in no way limitative of the scope of the invention, and from the attached illustrations, in which: - [Fig.l] represents a schematic and perspective view of an example of an explosion panel and a rigid element according to the invention, the rigid element being schematically fixed to a rigid structure opposite the panel. - [Fig.2] corresponds to [Fig.l] in the open position of the explosion panel. - [Fig.3] illustrates a sectional view of a flame arrester incorporating the explosion panel of [Fig.l] - [Fig.4] represents a schematic and perspective view of another example of the embodiment of an explosion panel and its rigid element, the rigid element being schematically fixed to a rigid structure opposite the panel. - [Fig.5] corresponds to [Fig.4] in the open position of the explosion panel. - [Fig.6] represents a schematic and perspective view of yet another example of the construction of an explosion panel and its rigid element, the rigid element being schematically fixed to a rigid structure opposite the panel. - [Fig.7] corresponds to [Fig.6] in the open position of the explosion panel. - [Fig.8] corresponds to yet another example of the production of an explosion panel which is here rectangular in shape and of its rigid element, the rigid element being schematically fixed to a rigid structure opposite the panel. - [[Fig.9]] corresponds to [Fig.8] in the open position of the explosion panel. - [[Fig. 10]] represents a schematic and perspective view of yet another example of the construction of an explosion panel and its rigid element, the rigid element being schematically fixed to a rigid structure opposite the panel. - [[Fig.l 1]] corresponds to [Fig.10] in the open position of the explosion panel.

[0023] The explosion panel 1 according to the invention illustrated in the figures constitutes a depressurization device which is intended to seal in a sealed manner the orifice of an enclosure to be protected in the event of overpressure occurring in the latter or even of an explosion.

[0024] According to the invention, the explosion panel 1 is intended in its position of use, to be mechanically connected from its middle part and in a direction perpendicular to the general plane of the panel, to a rigid structure 2 which is arranged opposite said explosion panel 1 and the enclosure for which the panel is intended. This mechanical connection is intended in particular to improve the mechanical resistance of the explosion panel in its closed state in the event of increased pressure which it could undergo on its face opposite that facing the storage enclosure to be protected.

[0025] In a non-limiting exemplary embodiment, the rigid structure 2 of arrangement opposite the explosion panel 1 is the framework of a flame arrester device 20 as illustrated in [Fig. 3]. The flame arrester device 2 is here of cylindrical shape but could also be of another shape. The flame arrester device 2 is intended to be mounted around an orifice of an enclosure and externally to the latter with the explosion panel 1 as an interface. The flame arrester device 20 is arranged extending in height around the explosion panel 1 to protect the external environment in the event of an explosion, having a flame arrester function and a dust barrier and heat evacuation function in the event of the explosion panel being ripped open. Advantageously, in addition to its flame arrester function, the flame arrester device 20 thus provides the rigid mechanical connection structure required for the explosion panel 1.

[0026] With reference to [Fig. 1], the explosion panel 1 comprises a metal sheet 10, a fixing frame 11 which is integral with the entire periphery of the sheet 10, and a weakening zone 12 which is arranged in the thickness of the sheet and on the periphery of the fixing frame 11 and which is capable of breaking in the event of overpressure in the enclosure, as well as at least one rigid mechanical connection element 3, which is fixed in a medial manner to the sheet 10, here in its center, and which extends in a plane perpendicular to the latter while being intended to be fixed in a manner opposite to the rigid structure 2.

[0027] The sheet 10 has two opposite faces, a face 10A called internal and an opposite face 10B called external. The internal face 10A is the face on which said at least one rigid element 3 is fixed. The external face 10B is the face intended to be opposite the enclosure for which the explosion panel 1 is intended. Said at least one rigid element 3 has two opposite ends 3A and 3B which are respectively fixed to the sheet 10 (on its internal face 10A) and to the structure 2. Said at least one rigid element 3 is preferably metallic.

[0028] The sheet 10 has a thickness of between 0.5 and 1.2 mm, for example of the order of 0.8 millimeters. The weakening zone 12 consists for example of discontinuous slots in the thickness of the sheet 10, generally made by laser, and connected by frangible solid parts.

[0029] The weakening zone 12 has arrangement variants depending on the type of rigid element 3.

[0030] To ensure the sealing of the explosion panel 1 at the level of the weakening zone 12, the panel 1 comprises sealing means not illustrated and known per se such as a sealing gasket covering on the internal face 10A the weakening zone 12 and the peripheral frame 11 which is intended to be fixed by bolting around the orifice of the enclosure.

[0031] According to an exemplary embodiment illustrated in Figures 1 and 4, the rigid element 3 is unique and comprises a body 30 of elongated shape in the manner of a column and fixed to the center of the sheet 10. By being arranged at the midpoint of the sheet 10, the weakening zone 12 is then arranged over the entire periphery of the sheet 10 and on the periphery of the fixing frame 11. In the exemplary embodiment of an explosion panel 1 of circular shape (Figures 1 to 3), the weakening zone 12 extends over 360°. In the exemplary embodiment of an explosion panel 1 of rectangular shape (Figures 4 and 5), the weakening zone 12 extends over the entire rectangular periphery (long sides and short sides of the rectangle of the sheet). In the event of an explosion, the explosion panel 1 opens over its entire periphery while remaining attached to the rigid element 3 at its base, the sheet folding against and around it, as illustrated in [Fig. 2] and [Fig.5], .

[0032] In this embodiment for which the body 30 of the rigid element 3 is of elongated shape, the body 30 has for example the shape of a cylindrical tube. In addition, the rigid element 3 may comprise, coupled to the body 30 and to the distal end 3B opposite that fixed to the sheet, a flared portion 31 which starts from the proximal portion of the cylindrical body 30 and flares out by widening towards said distal end 3B and towards the plane of the mechanical connection structure 2. The flared portion 31 serves as a stop surface for the sheet 10 during its deployment.

[0033] The flared portion 31 may be part of the structure 2 ([Fig. 3]) by being arranged around the distal end 3B of the cylindrical body 30 of the rigid element 3. Said flared portion 31 is then hollow for the passage of the cylindrical body 30. Said flared portion 31 may be integral with the structure 2 or preferably attached to the structure 2 by removable fixing means 31', for example by bolting. Alternatively, the flared portion 31 may be integrally attached to the body 30 in a single piece ([Fig. 4]).

[0034] The rigid element 3 is fixed at its distal end 3A to the internal face 10A of the sheet 10. It is for example welded there or preferably is fixed there in a removable manner. Preferably, the sheet 10 has in its center a welded nut 13 (welded on the internal face 10A of the sheet), while the body 30 of the rigid element 3 has its end 3A which is threaded. Thus, the explosion panel 1 is less bulky and it is more convenient if necessary to mount the rigid mechanical connection element 3 after fixing the explosion panel 1 to the enclosure; the threaded end 3A of the element rigid element 3 is assembled by screwing into the welded nut 13 of the sheet 10. As for the opposite end 3B of the rigid element 3 fixed to the structure 2, it is preferably fixed there in a removable manner. For example ([Fig.3]), the end 3B of the body 30 of the rigid element is hollow and tapped to accommodate a clamping screw 21. The clamping screw 21 passes through the structure 2 which is therefore sandwiched between said screw 21 and the rigid element 3.

[0035] In the example presented in [Fig. 3] for which the structure 2 corresponds to the framework of the flame arrester device 20, the explosion panel 1 is coupled to the flame arrester device 20 by its exterior and is opposite the hollow volume of said flame arrester device, the hollow volume being surrounded in a known manner by a filter 20'. The frame 11 of the explosion panel 1 is intended to be placed around the orifice of the enclosure to be protected and to be held in compression by the fixing of the flame arrester device 20 to the enclosure. The fixing of the flame arrester device 20 to the enclosure is done in a known manner, for example by bolting threaded rods 20”. Preferably, the rigid element 3 is added and fixed to the sheet 10 by screwing its end 3A even before the assembly of the flame arrester device 20 and the explosion panel 1 has been fixed to the enclosure.Advantageously, in the use of the flame arrester device 20, the latter comprises a closing cover 23 (opposite the explosion panel 1) which comprises a hatch 24 for access to the interior of the flame arrester device and therefore to the interior of the hollow volume. The hatch 24, for its opening and closing, is movable or removable such as by bolting. Once the explosion panel 1 is installed on the enclosure, the flame arrester device 20 is attached thereto, the rigid element 3 at its end 3B passing through the structure 2. Then the operator accesses the interior of the flame arrester device 20 through the hatch 24 to complete the fixing of the rigid element 3 to the structure 2 by introducing and screwing the clamping screw 21 into the thread of the end 3B of the rigid element 3, and finally he closes the hatch 24.

[0036] Furthermore, the distal end 3B of the rigid element 3, which is fixed to the structure 2, can be coupled to a spring 4. The spring 4 is arranged around the rigid tube 3 and bears by its two ends respectively against a peripheral shoulder 32 of the body 30 of the rigid element 3, such as for example the bottom of the flared part 31, and against the structure 2. The spring 4 is capable of compressing in the event of explosion of the panel 1 and opening of the sheet 10 to allow the sheet 10 of the explosion panel 1 to deform under pressure and thus facilitate its rupture.

[0037] According to another embodiment illustrated in Figures 6 to 9, the rigid element 3 is in the form of a flange or plate 33 which extends in a plane perpendicular to the sheet 10 and along the entire longitudinal median zone of the sheet 10 from one side to the other of the weakening zone 12, parallel to the large side of the rectangle of the sheet for [Fig.6] and along the diameter of the sheet for [Fig.8]. The weakening zone 12 then does not extend over the entire periphery of the sheet 10 but along two opposite and facing lines 12A and 12B without them joining to provide two solid median zones 14A and 14B in the plane of the rigid element 3. The plate 33 can be welded by its distal end 3A to the sheet 10 or be fixed in a removable manner by mechanical connecting parts, for example by tabs 15 which are welded to the sheet 10 and which cooperate by screwing into the plate 33 placed in position. The end 3B of the plate 33, opposite the sheet 10, is also fixed in a removable manner to the structure 2 by mechanical connecting parts 16 (for example clamping tabs).

[0038] In the example of the explosion panel of [Fig.6], the explosion panel 1 is circular in shape, generating a circular-shaped sheet 10. The weakening zone 12 draws, in a top view, a general shape according to two facing semicircles 12A and 12B which do not touch. More particularly, the weakening zone 12 extends at the periphery of the sheet 10 according to two circular arcs 12A and 12B with an angle close to 180° without joining, leaving a solid median zone 14 along and on each side of the plate 3 and two solid median end zones 14A and 14B. According to this arrangement of the weakening zone 12, the sheet 10 is intended to be divided and deployed in two parts 10' and 10”, as illustrated in [Fig.7].The two parts 10' and 10” of the sheet 10 form two leaves which open from the periphery of the two semicircles and towards the center, the solid middle zones 14, 14A and 14B which extend according to the diameter of the sheet 10 acting as a hinge for the pivoting of the leaves 10' and 10”. The two leaves 10' and 10” open back to back and the plate 33 also constitutes a stop surface which allows the leaves not to collide with each other when they are deployed.

[0039] The variant of [Fig.8] illustrates a rectangular explosion panel 1 with its rectangular sheet 10. The weakening zone 12 draws, according to a top view, a general shape of two U or C shapes facing each other 12A and 12B (the openings of the U being facing each other) from the periphery. More particularly, the weakening zone 12 extends at the periphery of the sheet 10 for each of the U shapes, along a main branch parallel to the two large opposite sides of the rectangle and along two parallel lateral branches which extend perpendicularly from the ends of the main branch. The pair of lateral branches of one U is directed towards the other pair of branches of the other U without joining so as to leave between the two U's 12A and 12B, two opposite median solid zones 14A and 14B which are connected to each other by a solid zone 14 along and on either side of the plate 33 so as to form zones with a hinge function.According to this arrangement of the weakening zone 12, the sheet 10 is able to open as illustrated in [Fig.9], in two leaves 10' and 10” from the periphery of the long sides and towards the center of the rectangle. The two leaves 10' and 10”. open back to back and plate 33 also constitutes a stopping surface which prevents the leaves from colliding with each other when they are deployed.

[0040] According to yet another embodiment ([Fig. 10] and [Fig. 11]) of said at least one rigid element 3, the explosion panel 1 may comprise a rigid element 3 comprising two rigid columns or uprights 30 spaced apart and arranged in the middle zone of the sheet 10, preferably arranged diametrically opposite, and secured to a connecting plate 30' (arranged in the middle part of the sheet and connecting the two uprights), the connecting plate 30' being limited in height relative to the height of the uprights. Preferably, the two uprights 30 and the connecting plate 30' form the single-piece rigid element 3. The two uprights 30 are fixed by their opposite distal ends respectively to the sheet 10 and to the structure 2. Only the two uprights 30 are fixed to the structure 2 (the connecting plate 30' not reaching the structure 2). Preferably, the connecting plate 30' rests by one of its edges against the sheet 10.Preferably, the connecting plate 30' is fixed to the sheet 10. The weakened zone 12 is, as in the aforementioned example of Figures 6 to 9, discontinuous in the middle zone of the sheet 10 from one side of the sheet to the other to provide two solid zones 14A and 14B at the foot of the tubes 30 and a solid middle zone 14 between the tubes 30 so as to provide a zone with a hinge function for the sheet 10 which will open into two leaves 10' and 10” back-to-back. The two rigid uprights 30 and the middle connecting plate 30' play their role of resistance to depression for the sheet 10 and the connecting plate 30' also constitutes a stop surface for the leaves 10' and 10” during their deployment.

Claims

Claims

1. Flame arrester device (20) comprising an explosion panel (1) and a rigid structure (2) delimiting with the explosion panel a hollow volume, the explosion panel (1) comprising a sheet (10) called a rupture sheet provided with a weakening zone (12), a peripheral fixing frame (11), and at least one rigid element (3) extending perpendicular to the sheet and being arranged in the center of the sheet (10) or extending in a median plane of the sheet (10), characterized in that said at least one rigid element (3) is fixed, on the one hand, to the sheet (10), and on the other hand, to the rigid structure (2) opposite the sheet (10), to constitute a mechanical connection between the sheet and the structure.

2. Flame arrester device according to claim 1, characterized in that said at least one rigid element (3) is fixed to the sheet (10) at at least one fixing point.

3. Flame arrester device according to claim 1 or 2, characterized in that it comprises a single rigid element (3) which extends in the manner of a column and which is arranged in a localized manner in the center of the panel sheet, and the weakening zone (12) of the sheet extends over the entire periphery of the sheet and of the fixing frame.

4. Flame arrester device according to claim 3, characterized in that the sheet (10) is of circular section and the weakening zone (12) extends over 360° of the periphery.

5. Flame arrester device according to claim 3, characterized in that the sheet (10) is of square or rectangular section and the weakening zone (12) extends over the entire periphery, respectively square or rectangular, of the sheet.

6. Flame arrester device according to claim 1, characterized in that the rigid element (3) comprises a plate (33; 30') which extends perpendicular to the sheet and along a median line of said sheet, while the sheet (10) has its weakening zone (12) which extends at the periphery of the sheet and of the fixing frame along two opposite and facing lines without them meeting to provide two median solid zones (14A, 14B) in the plane of the rigid element (3).

7. Flame arrester device according to claim 1, characterized in that it comprises at least two rigid elements (3) which extend in the manner of two columns (30) and which are spaced and arranged on a median line of the sheet, while the sheet (10) has its weakening zone (12) which extends on the periphery of the sheet along two opposite and facing lines without them joining to provide two median solid zones (14A, 14B) in the plane of the rigid element.

8. Flame arrester device according to any one of the preceding claims, characterized in that said at least one rigid element (3) is removably attached to the sheet (10).

9. Flame arrester device according to the preceding claim, characterized in that when the rigid element (3) is column-shaped, it has at least one distal end (3A) which is threaded while the sheet (10) comprises a nut (13) welded to receive by screwing said threaded end (3A), or when the rigid element (3) comprises a plate (33), the sheet (10) comprises mechanical connection parts such as welded tabs (15) which are capable of being bolted to the plate.

10. Flame arrester device according to any one of the preceding claims, characterized in that the rigid element (3) has a distal end (3B) opposite that fixed to the sheet, which comprises a mechanical connection fixing system, preferably a mechanical connection fixing system according to a male-female cooperation.

11. Flame arrester device according to claims 3 and 10, characterized in that the rigid column-shaped element (3) has its distal end (3B) opposite that fixed to the sheet, which is threaded.

12. Flame arrester device according to any one of the preceding claims, characterized in that the rigid element (3) has a distal end (3B) opposite that fixed to the sheet, which comprises a flared part (31) which widens towards said distal end (3B).

13. Flame arrester device according to any one of the preceding claims, characterized in that it comprises, in particular when the rigid element (3) has the shape of a column, a spring (4) which is arranged around the rigid element (3) and at the distal end (3B) opposite that fixed to the sheet, the spring (4) resting on a shoulder (32) of the rigid element.

Images