EXPLOSION-PROOF HOUSING

Description

[0001] The invention relates to an explosion-proof housing, preferably of the protection type "flameproof enclosure".

[0002] State-of-the-art enclosures are known that are designed according to the explosion protection type "flameproof enclosure." This allows the accumulation of an explosive gas mixture within the enclosure and its explosion due to ignition sparks generated by an electrical device within the enclosure. Depending on the protection type, it is also permissible for gas or particles to escape through gaps inside the enclosure during an explosion, where an explosive atmosphere may be present. However, depending on the explosion protection type, it must be ruled out that the gas or the particles are so hot or glowing that the explosive atmosphere outside the enclosure could be ignited.

[0003] DE 10 2010 016 782 A1 describes a pressure relief device for flameproof enclosures. This device is designed to be installed in a housing component and to reduce the magnitude of pressure peaks occurring even during an explosive reaction in the interior by allowing the resulting gases to escape quickly and easily from the housing through the pressure relief device.

[0004] DE 34 36 300 C2 discloses a device enclosure with an explosion-proof chamber. The enclosure comprises a shell as a first enclosure part and a cover as a second enclosure part. The shell and cover have corresponding flanges to create a flange connection between the shell and the cover. Gaps between the flanges through which gas or particles can escape from the interior of the enclosure to the outside in the event of an explosion are permitted. However, these gaps are dimensioned such that a gas ignited within the cavity of the enclosure cools sufficiently before exiting the enclosure through gaps between the flanges. A seal can be arranged between the flanges to prevent moisture from penetrating the enclosure.

[0005] To ensure the gap dimensions required for a flameproof gap, the opposing flange surfaces in conventional housings are manufactured with relatively tight manufacturing tolerances. To close the housing, the flanges are arranged against each other to form a flameproof gap, and the flameproof gap between the flanges is secured by pressing the flanges against each other.

[0006] DE 26 17 965 B2 discloses a housing described as pressure-resistant, which comprises a lower housing part and an upper housing part. The two parts form an intermediate space, referred to as the gap. A seal is arranged between the upper and lower housing parts. This seal, together with spring elements, serves to hold the lower housing part together with the upper housing part. The spring elements are arranged in the intermediate space. The intermediate space is filled with cast resin. It is stated that by filling the gap with cast resin, a pressure-resistant housing is obtained which is designed without a gap.

[0007] DE 10 2007 003 009 A1 describes a method for manufacturing fluid-tight housings, as well as a fluid-tight housing. The housing comprises a base part and a plate-like cover, as well as a seal arranged between facing wing surfaces of the base part and cover for fluid-tight sealing of the housing interior. The base part and cover are fastened to each other in a pre-tensioned manner, so that the elastic seal is deformed. This prevents gas from the environment of the housing from reaching an ignition source located within the fluid-tight housing.

[0008] DE 10 2013 111 374 A1 discloses an explosion-protected assembly for electrical and / or electronic components. The assembly comprises a carrier and a cover body. The cover body defines at least one receiving chamber for the components. An elastic coupling element is arranged between the cover body and the carrier, which completely encloses the opening in the cover body. When the cover body and the carrier are connected by means of a force-fitting and / or form-fitting connection, the coupling element between the cover body and the carrier is elastically deformed. The explosion-protected assembly is intended to meet the requirements defined for encapsulation (Ex-m) or flameproof encapsulation (Exd). Encapsulation (Ex-m) excludes an explosive atmosphere from the interior of a housing.

[0009] DE 1 801 062 A discloses a flameproof enclosure made of welded sheet steel parts. The enclosure has a ring that is inserted into an opening in a wall of the enclosure by a welded joint. The ring has a conical mating surface that serves as a seat for a cover. The cover can be secured to the enclosure by a bayonet-type lock. A fit between the ring and the cover requires close tolerances, which increases manufacturing costs.

[0010] GB 778 040 discloses a housing with a part defining an interior of the housing and having an opening that allows access to the interior when the housing is open, and with a second part for closing the opening. An elastically deformed, open-pore element is arranged between the first part and the second part, which closes the gap between the first part and the second part in a flameproof manner. If the housing is resealable without replacing the element, care must be taken to ensure that the element is not damaged when opened.

[0011] FR 1 174 709 discloses a flanged housing closed by a cover resting on the flange. The flange and the cover are overlapped by a grooved strip, with the strip interacting with a slanted inner surface and the cover with a wedge surface in a clamping manner. This clamps the edge of the cover flat against the flange.

[0012] A similar construction is disclosed in US 2015 / 0076156 A1, in which, however, the wedge surface is attached to the underside of the flange.

[0013] DE 199 59 384 A1 discloses other examples of pressure-tight assembly of explosion-proof housing parts using external clamping parts.

[0014] It can be regarded as an object to provide an improved concept for an explosion-proof housing. This object is achieved with an explosion-proof housing according to claim 1, a method according to claim 14 and a method according to claim 15: The explosion-proof housing forms an interior space for accommodating components which can form ignition sources. The housing has a first housing part with a first section which has a first surface, and a second housing part with a second section which has a second surface. The first section and / or the second section is a wall section. The wall, the section of which is the first section or the second section, can be a side wall, a base or back or a lid or another closure (for example a front closure or a rear closure).The first surface and the second surface define an intermediate region, which is a separation point of the housing. The first section and the second section are pressed against each other by means of a bracing device, with elastic deformation of the wall section, directly and / or indirectly via at least one intermediate layer, so that the intermediate region is geometrically closed in a flameproof manner by the elastic deformation of the wall section. According to the invention, a method for producing a housing, for example, a housing according to the invention described herein, is specified.The method comprises selecting a first section and a second section for delimiting an intermediate region of the housing, wherein at least one of the sections is a wall section, such that the first section and the second section can be pressed against one another under elastic deformation of the wall section, so that the intermediate region is geometrically closed in an ignition-proof manner by the elastic deformation of the wall section.

[0015] A further method according to the invention serves to produce an explosion-proof connection between a first section of a first housing part having a first surface and a second section of a second housing part having a second surface. This method can be applied, for example, to a housing according to the invention described herein. The method comprises assembling the first housing part and the second housing part in order to close the housing, wherein the first surface and the second surface delimit an intermediate region which has a gap outside an ignition-proof region. The sections are subjected to a force such that the intermediate region is geometrically closed in an ignition-proof manner by the elastic deformation of the wall section.

[0016] In embodiments, the intermediate region can be closed to a width of zero, i.e., it can be an ignition-proof zero gap, or an ignition-proof gap of zero gap width can be formed in the intermediate region.

[0017] In the prior art, to create a flameproof connection between two elements of a housing, between which a flameproof gap is formed, the housing parts are shaped, in particular reworked, so that they fit together to form the flameproof gap between the housing parts. According to the invention, a gap that maintains the maximum length and width for flameproofing is reliably formed only when the first and second sections are pressed against each other, resulting in elastic deformation of at least one wall section.Consequently, pressing the second housing part against the first housing part does not serve - as in the prior art - to secure an ignition-proof gap that already arises when two surfaces of the housing parts are in contact, but the formation of the ignition-proof gap dimensions is only ensured by the deformation of the first section and / or the second section during the connection of the second housing part to the first housing part.

[0018] The deformation of the first section and / or the second section preferably leads to a deformation of the surface of the first section and / or the surface of the second section and / or a reduction in an angle determined by the surfaces, which surfaces define the width of the intermediate region, and thus to a reduction in the width of the intermediate region, such that the intermediate region is closed in a flameproof manner. The first section and the second section can form a wedge gap, wherein the gap can be given the wedge shape as a desired shape based on the desired shapes of the first section and the second section, or wherein the gap can have the wedge shape based on a predetermined shape of the first section and the second section that deviates from the desired shapes. The elastic deformation further closes the wedge gap, whereby the wedge gap can retain or lose its wedge shape.

[0019] The inventive concept places lower demands on the tolerances of the housing parts that define the separation point. The inventive concept also makes it possible to create intermediate areas that deviate from a flat gap shape, e.g., curved gaps (e.g., U-shaped gaps in cross-section) or, for example, V- or W-shaped gaps.

[0020] According to the invention, the deformation of the first housing part and / or the second housing part can be used specifically to compensate for large tolerances of the first housing part / second housing part or a deliberately deviating shape through the deformation. The deformation is used as a means of ensuring ignition resistance.

[0021] The explosion-proof housing can, for example, be designed according to the protection type "flameproof enclosure" according to the standard (DIN EN 600-79 / 1) or an American standard (for example).

[0022] Further advantageous, optional features and embodiments of the housing according to the invention and of the method according to the invention emerge, for example, from the following description: In embodiments of the housing, the first section of the first housing part and / or the second section of the second housing part is a sheet metal section. If the first housing part and / or the second housing part are sheet metal parts, particularly lightweight housings can be produced. The first housing part and / or the second housing part can be deep-drawn sheet metal parts. The sheet metal thickness of the first section and / or the sheet metal thickness of the second section can, for example, be 5 millimeters or less in embodiments, for example 3 millimeters or less. The smaller the sheet metal thickness, the lower the force required for the deformation to ensure flame-proof closure.

[0023] In preferred embodiments of the explosion-proof housing, the first section and the second section press against one another, with elastic deformation of both the second section and the first section, in order to close the intermediate region between the first section and the second section in an ignition-proof manner. In such embodiments, both a deformation of the second section and a deformation of the first section towards one another contribute significantly to closing the intermediate region in an ignition-proof manner. Preferably, the elastic deformability of the first section of the first housing part and the elastic deformability of the second section of the second housing part are so great that the first section and the second section, when deformed to close the intermediate region in an ignition-proof manner, cover distances towards one another whose lengths differ by a maximum factor of 10.

[0024] The first housing part and the second housing part can have predetermined shapes so that even when the second housing part is in direct contact with the first housing part, at least in the non-ignition-proof state when pressed against each other, they delimit the intermediate region, which is intended to be closed by clamping in an ignition-proof manner, with a width different from zero.

[0025] The first section and the second section may have different predetermined shapes. Predetermined shapes are those that have shapes and / or dimensions within the predetermined tolerance range around the specified shape (nominal shape).

[0026] At least without the elastic deformation, the first section and the second section do not have a shape that matches each other in such a way that an ignition-proof intermediate region geometry would already be present without deformation, and are therefore not mating surfaces. At least without the elastic deformation, the first section and the second section (their surfaces) can have significantly different desired shapes or predetermined shapes.

[0027] The first section and the second section can have different nominal shapes, so that when the first housing part is in contact with the second housing part in the unstressed state of the first section and the second section, the first section and the second section enclose an angle due to the geometric nominal shapes.

[0028] The width of the intermediate region can increase when the first housing part and the second housing part are supported against one another, at least in the non-ignition-proof state pressing against one another, due to the desired shape of the first section and the second section from a support region towards the surroundings of the housing and / or towards the interior.

[0029] Preferably, the section is supported on the counter-section during the ignition-proof closure of the intermediate region by elastic deformation directly or indirectly in a defined support region, wherein the support region forms an inner edge and / or an outer edge of the intermediate region and / or wherein the support region is arranged between an inner edge and an outer edge of the intermediate region.

[0030] The first section and / or the second section can form bending springs and / or arms of a one-sided lever, which are moved relatively towards each other away from the support region during elastic deformation for flameproof closing.

[0031] During deformation, an angle formed by the sections prior to deformation due to deviating target shapes and / or deviating predetermined shapes can be reduced (e.g., to zero). The first section and / or the second section are only adapted to each other through deformation. "Adapting" is understood as a process toward a complementary shape of the sections without necessarily having to achieve the complementary shapes. For flame-proof sealing, it is not absolutely necessary that this process result in a complementary shape. Rather, the intermediate region geometry can fall within the geometry range of flame-proof gaps through deformation even without achieving complementary shapes, whereby the intermediate region can be free or filled after deformation. The first section and the second section can acquire complementary shapes through deformation.In other embodiments, an angle between the surfaces of the first portion and the second portion that existed before the deformation is at least reduced due to the deformation.

[0032] The first section and / or the second section can form an elongated receptacle, e.g., a bead. The receptacle can be, for example, U-shaped, V-shaped, or W-shaped in cross-section of the first section and / or the second section. The second section and / or the first section has an elongated protrusion received in the receptacle. In embodiments, the opposing surfaces of the protrusion and the receptacle have different shapes when pressed against one another in a non-ignition-proof state, e.g., V-shapes with different opening angles or U-shapes with different curvatures.When bracing the first section and the second section to ensure flameproofing, the first section and / or the second section, and thus the surfaces, can be deformed in exemplary embodiments such that the previously non-complementary shapes nestle flat against one another. When the first section and / or the second section are deformed, the surface of the sheet metal element can touch the surface of the other element. The flameproof intermediate region can form a gap with a gap width of 0. The intermediate region can, in particular, be a gap with a gap width of 0.

[0033] In the clamped state, the intermediate region can be free of a solid filling or filled with an elastically deformed solid. In embodiments, at least one elastically deformed intermediate layer can be arranged between the first section and the second section, by means of which intermediate layer the first section and the second section are pressed against one another. An elastically deformed intermediate element can be arranged between the first section and the second section. The first section and the second section can be pressed against one another via the intermediate element. The intermediate layer and / or the intermediate element can be separate from the first section and / or the second section or can be integrally connected to the first section or the second section, e.g., glued. The intermediate element can, for example, be frame-shaped in order to surround an opening in the housing. The intermediate element can be made of plastic.

[0034] The intermediate region can enclose an angle other than zero degrees with a dimensional direction (e.g. length direction, width direction, height direction), i.e. a direction in which a dimension of the housing is measured. In known housings with an ignition-proof flat gap, the flat gap is formed, for example, parallel to the width direction of the housing or to the length direction of the housing or to the height direction of the housing. If an intermediate region, in particular in a gap-shaped intermediate region, encloses an angle with a dimensional direction, the housing can have smaller dimensions in this direction than if the intermediate region is aligned parallel to the dimensional direction, for example. This makes it possible to manufacture particularly compact housings or housings with optimally large internal volumes.

[0035] In preferred embodiments, the intermediate region and / or the first surface and the second surface that delimit the intermediate region are oriented obliquely with respect to a wall of the housing. The intermediate region and / or the first section and / or the second section can form an angle with the wall of the housing that deviates from 90° and is greater than 0° and less than 180°. The intermediate region, the first section, and / or the second section can, in particular, protrude obliquely from a wall of the housing, either outwardly or inwardly.

[0036] The first section and / or the second section can, for example, be a section projecting from a wall of the housing outwards, ie towards the surroundings of the housing, or inwards, ie towards the interior of the housing.

[0037] In preferred embodiments, the first section and / or the counter-section has a device for defining a bending zone. The bending zone can be defined, for example, by providing an area in the sheet material with a reduced wall thickness compared to another area of ​​the first section. The area can be linear. In particular, the area can follow a straight line. The device can, for example, be a groove-shaped depression in the section or the counter-section. The bending zone can follow a straight line. Greater compliance in the bending zone can be defined, alternatively or in addition to a reduced wall thickness, for example by a structural change in an area of ​​the sheet material.In particular, if a device for defining a bending zone is present in the section and / or the countersection, the deformations during clamping can be predetermined with particular precision. With such a device, the material, particularly sheet metal material, of the section and / or the countersection can be designed to be strong enough to withstand an explosion, while also being flexible enough to minimize the force required for deformation to form the flameproof intermediate region.

[0038] In preferred embodiments, the housing is resealable. For reseal, the first section and the second section can preferably be repeatedly pressed against each other, with elastic deformation of the one or more wall sections, in order to reseal the intermediate region between the first section and the second section in a flameproof manner.

[0039] Particularly thin sheet thicknesses become possible if the housing is assigned an internal and / or external pressure relief device. The pressure relief device preferably assigned to the housing is preferably configured and intended to limit the maximum overpressure that arises due to an explosion inside the housing to a maximum value that is smaller than the maximum value that would occur in the same housing without the at least one pressure relief device.

[0040] The at least one device for reducing the explosion pressure can comprise a pressure relief device arranged in or on an opening in the housing to the outside of the housing, in order to release gas from the interior of the housing for relief in the event of an explosion (external pressure relief device). Such a pressure relief device is preferably designed to be flameproof according to the protection type "flameproof enclosure" (e.g., Ex-d, EN 600 79-1).

[0041] Alternatively or additionally, the at least one device for reducing the explosion pressure may comprise a device which cannot allow gas to escape from the housing, but which can absorb heat and / or kinetic energy from the explosion in order to limit the maximum overpressure due to the explosion (internal pressure relief device).

[0042] The pressure relief device for reducing explosion pressure preferably comprises open-pore material. Due to its large surface area, open-pore material can effectively cool the gas to reduce the maximum explosion pressure. Open-pore material can be, for example, fiber material, such as metal fiber material, fibers processed into a woven fabric, a scrim, or a felt, or it can be formed from a bed of free-flowing material.

[0043] The pressure relief device can, for example, be configured and intended to limit the overpressure due to an explosion to a maximum value of 1000 millibars or less, or particularly preferably to a maximum value of 500 millibars or less. The at least one pressure relief device for reducing explosion pressure is preferably configured and intended to reduce an explosion overpressure (overpressure above atmospheric pressure) of several bars, in particular greater than or equal to 10 bar, which would occur if the at least one device were not provided in the otherwise unchanged housing, to an overpressure of, for example, less than or equal to 1 bar.

[0044] In embodiments, the internal volume of the housing may be 1 liter or more, 10 liters or more, 50 liters or more, 100 liters or more, 500 liters or more, or 1000 liters or more.

[0045] Further optional advantageous features and embodiments emerge from the dependent claims, the following description, and the figures. They show, by way of example: Figure 1a - an example of a housing according to the invention in a perspective view, Figure 1b - a first housing part of the housing according to Figure 1a in perspective view, Figure 1c - a second housing part of the housing according to Figure 1a , Figure 2 - a cross-sectional view through a first section and a second section of the housing according to Figure 1a (along a section of the section line S1), Figure 3 - a cross-sectional view through a first section and a second section of the housing according to Figure 1a in the clamped state, Figure 4 - a cutout (along the cutting lines S1 and S2, perpendicular to the second housing part) of the housing according to Figure 1a in perspective schematic representation, not to scale, Figure 5 - a cross-sectional view through a first section and a second section of the housing according to Figure 1a in the non-tensioned state along a section of the section line S1, Figure 6a - a sectional view of a modification of the housing according to Figure 1a along a section of the intersection line S1 and S2, Figure 6b - a cross-sectional view through the first section and the second section of the housing parts of the housing according to Figure 6a along a section of the section line S1, Figure 6c - schematic and partial cross-sectional representation of the first section and the second section according to Figure 6b along a section of the section line S1, Figure 7 - a partial cross-sectional view through a modification of the embodiment according to Figure 6a along a section of the section line S1, Figure 8a, 8b- a partial cross-sectional view through a further modification of the embodiment according to Figure 6a in the unstressed ( Figure 8a ) and tense state ( Figure 8b ) along a section of the section line S1, Figure 9a - a section of the housing according to a further embodiment in perspective view along the section lines S1 and S2, schematic, not to scale, Figure 9b - a partial cross-sectional view according to the embodiment according to Figure 9b along the section line S1, Figure 9c - a partial cross-sectional view through a modification of the embodiment according to Figure 9a along the section line S1, Figure 10a - a schematic cross-sectional view through a first and a second housing part of a further embodiment of the housing according to the invention, Figure 10b- a schematic cross-sectional view through the housing with clamped first and second housing parts, Figure 10c - a representation of a modification of the embodiment according to Figures 10a and 10b , Figure 11a , 11b - two exemplary views of a surface of a first section of the first housing part of the housing of the Figure 10b , Figures 12a - an illustration of an embodiment of a method according to the invention and Figure 12b - an illustration of an embodiment of a further method according to the invention.

[0046] The Figures 1a to 1cshow an embodiment of an explosion-proof housing 10 according to an embodiment of the teachings of the invention. The housing 10 has a trough- or container-shaped, for example cuboid-shaped or cylindrical, first housing part 11, which has a wall 12. The wall 12 has a first wall section (of a first section 13). The housing part 11 encloses an interior space 14 of the housing 10 in the circumferential direction in order to delimit the interior space 14 from the surroundings 15 of the housing 10. The interior space 14 can be intended to accommodate electrical or electronic components 16, which can form ignition sources. The first housing part 11 defines an opening 17. The opening 17 is closed with a lid-shaped second housing part 18, which forms a wall of the housing 10 and thus a second wall section (a second section 20).Depending on the use of the housing 10, the second housing part 18 can, for example, form a rear wall, a front wall, a side wall or a cover of the housing 10.

[0047] The first housing part 11 can be made of sheet metal. The material of the first housing part 11 is preferably free of flame-proof open pores or gaps that would connect the interior 14 of the housing 10 to the environment 15. However, an external pressure relief device 21 with an open-pore pressure relief body 20 can be arranged on the first housing part 11, and / or an internal pressure relief device 23 can be arranged in the housing 10.

[0048] The internal pressure relief device 23 can, as can be seen from Figure 1bThe inner pressure relief device 23 can be arranged in the interior 14, in particular on one wall side or several wall sides, of the first housing part 11. The inner pressure relief device 23 has porous material 24. This can be, for example, a bed of loose particulate material and / or an open-pored body, for example a plastic or metal foam, a random fiber body, a body made of one or more grid layers, whereby each grid layer can be woven, laid or manufactured in some other way. The inner pressure relief device 23 serves to absorb heat or kinetic energy from the explosion gas in the event of an explosion in order to thereby reduce the peak pressure which would occur in the housing 10 without the inner pressure relief device 23. The inner pressure relief device 23 is characterized in that it can reduce the peak pressure without letting gas out of the interior 14 of the housing 10.

[0049] On the wall of the first housing part 11, which has a pressure relief opening 21a, a pressure relief body 21b can be arranged, which closes the opening 21a in a manner that prevents ignition from spreading. The opening 21a and the pressure relief body 21b form an external pressure relief device 22. The external pressure relief device 22 has a pressure relief body 22, which has open pores that in principle allow gas exchange between the interior 14 of the housing 10 and the environment 15 of the housing 10, wherein the pores, however, form gaps with a maximum gap width and minimum gap length, so that hot gas and / or particles from the interior 15 of the housing 10 can only leave the pressure relief body 22 to the environment 15 of the housing 10 in a cooled state such that they cannot ignite the ignitable atmosphere in the environment 15 of the housing 10.The pressure relief body 22 is connected to the wall 12, for example by casting, gluing, soldering, welding, clamping or the like, in such a way that hot gas and / or particles cannot bypass the pressure relief body, at least not without being cooled to such an extent that they could ignite an explosive atmosphere in the environment 15 of the housing 10.

[0050] The inner pressure relief device 23 and the outer pressure relief device 22 can be arranged on one side of the housing 10, so that the gas first flows through the inner pressure relief device 23 and then flows through the outer pressure relief device 22 into the environment 15 of the housing 10.

[0051] The internal pressure relief device 23 and / or the external pressure relief device 22 preferably ensure a reduction of the peak pressure for the design case of the housing 10 to an overpressure of less than or equal to 1000 mbar or, preferably, less than or equal to 500 mbar.

[0052] The wall 12 of the first housing part 11, which defines the interior space 14 of the housing 10 from above, below and / or from the side, has as a first section 13 a section 13 which projects transversely, for example vertically, outwards (as shown) and / or (in sections) inwards, forming a flange section. The flange section 13 surrounds the opening 17. The flange section 13 can be closed in the circumferential direction. The flange section 13 has a bead 25. The base 26 of this bead can protrude towards the side of the first housing part 11 opposite the opening 17 or in the opposite direction. The bead 25 preferably surrounds the opening 17 in a closed manner all around the circumference.

[0053] The material of the second housing part 18, preferably sheet metal, is preferably free of flame-proof open pores or gaps that would fluidically connect the interior 14 of the housing 10 with the environment 15. As can be seen from Figure 1cIn addition to or as an alternative to the inner pressure relief device 23 and / or the outer pressure relief device 22, which are carried by the first housing part 11, the housing 10 can hold a further pressure relief opening 27a and a further outer pressure relief body 27b, which form a further outer pressure relief device 28, and / or a further inner pressure relief device (not shown). These can, for example, be designed as above in connection with the inner and / or outer pressure relief device 23, 22 of the first housing part 11 and serve the same purpose. The outer pressure relief device 28 includes a pressure relief opening 27a in the second housing part 18, which is closed with a pressure relief body 27b in a way that is flame-proof but permeable to gas.

[0054] The first housing part 11 and the second housing part 18 can be made of, for example, sheet steel or aluminum sheet. Alternatively, the first housing part 11 and / or the second housing part 18 can be made of plastic. The edge section 20 and / or the flange section 13 are preferably sheet metal sections. The thickness, for example sheet thickness, of the flange section 13 and / or the edge section 20 can be less than or equal to 5 mm, less than or equal to 3 mm, or less than or equal to 2 mm. The housing 10 can have such small wall thicknesses without further stabilization measures due to the external pressure relief device 22, 28 and / or internal pressure relief device 23, which limits the explosion pressure so strongly that even a housing 10 made of a metal and / or plastic material with sheet thickness can withstand the explosion pressure.

[0055] As will be further Figure 1cThe second housing part 18 has a further bead 29 closed in the circumferential direction in the edge section 20, which forms the second wall section of the second housing part 18. The bead 25 and the further bead 29 form, as can be seen from Figure 2 , a receptacle-back pair. The protrusion, here formed by the bottom of the further bead 29, is received in a receptacle 30 formed by the bead 25 of the first housing part 11.

[0056] Figure 2 shows the first housing part 11 and the second housing part in a non-stressed state. Figure 1a The housing 10 is shown in this state without a clamping device. As can be seen from Figure 2further, a support area 31 is defined for the first section 13 and for the second section 20, in which the edge section 20 of the second housing part 18 is supported on the flange section 13 of the first housing part 11 when the second housing part 18 is placed on the first housing part 11 (as in Figure 1a and Figure 2 shown), without the first housing part 11 and the second housing part 18 being clamped together as in the case of the housing 10 in the flameproof state. As Figure 2As illustrated, the shapes of the edge portion 20 and the flange portion 13 are not complementary to one another. Rather, a gap-shaped intermediate portion 32 opens from the support portion 31 in the direction away from the support portion 31. The intermediate portion 32 is delimited by the opposing first surface 33 of the first portion 13 and the second surface 34 of the second portion 20. In a clamping region 35, which could also be referred to as the force introduction or pressing region and which is defined for the flange portion 13 and the edge portion 20, the sheet metal material of the first housing part 11 and the sheet metal material of the second housing part 18 are spaced apart from one another. The intermediate portion 32 forms a separation point of the housing 10.

[0057] It should be noted at this point that the intermediate region 32 can be completely or partially filled or free. The completely or partially filled intermediate region 32 can, for example, be filled with a plastic element.

[0058] Without the edge section 20 of the second housing part 18 and the flange section 13 of the first housing part 11 being clamped together, the intermediate region 32, despite the contact, still does not have a geometry, in particular a length and / or maximum width, such that it would be flameproof. In order to close the opening 17 with the second housing part 18 in a flameproof manner, the edge section 20 and the flange section 13 must be clamped together. A clamping device 36, as shown by way of example in Figure 3 The figure shows a section of the housing according to Figure 1a shown. From Figure 4This means that the bracing device 36 presses edge regions, as bracing regions, of the edge section 20 and the flange section 13 against one another in order to close the intermediate region 32 in a way that is flame-proof. Due to the low material thickness of the edge section 20 and the flange section 13, even small forces are sufficient for bracing to deform the edge section 20 and the flange section 13 in such a way that the intermediate region 32 is narrowed by the deformation of the flange section 13 and / or the edge section 20, so that the intermediate region 32, in the bracing state, has a gap geometry that is flame-proof. A 0-Ex gap (explosion-proof gap with a gap width of 0) can be formed by the deformation of the edge section 20 and / or the deformation of the flange section 13.

[0059] Figure 5is a more detailed illustration of exemplary geometric relationships in the housing 10 according to the invention. When the second housing part 18 (preferably a sheet metal part) and the first housing part 11 (preferably a sheet metal part) are brought into contact but not yet clamped, the distance b between the sheet metal section of the first housing part 11 and the sheet metal section of the second housing part 18 in the intermediate region 32 and the interior 14 of the housing 10 in the support region can be equal to 0 or in places greater than 0. A distance b greater than zero can be present in places along the edge of the first housing part 11 due to a predetermined shape of the second housing part 18, which deviates from the shape of the first housing part 18.

[0060] Away from the support region 31, the intermediate region 32 can increase to a width a (a greater than b). The radius of the rounded back 38 formed by the edge portion 20 can be r1, whereby the radius of the receptacle 30 can be r2, for example, and r1 is smaller than r2. By clamping the first housing part 11 and the second housing part 18 together by introducing force into an introduction region 35 remote from the support region 31, the shapes, in particular the radii of the edge portion 20 and the flange portion 13, are adapted to one another. They do not have to match afterwards, but the radii r1, r2 are, for example, adjusted to one another without necessarily having to be the same. In embodiments, the radii r1, r2 can be adjusted so that they are the same in the clamped state.

[0061] The first housing part 11 and / or the second housing part 18 may have a device 39 for defining a bending zone 40 of the first housing part 11 and / or the second housing part 18. In the Figure 5In the illustrated embodiment, the device 39 consists, for example, of a recess in the second housing part at the edge of the bead 29. The groove-shaped recess 39 can extend circumferentially in a continuous or interrupted manner along the bead 29, for example along a straight line. As an alternative or in addition to a reduced wall thickness, greater flexibility in the bending zone 40 can be determined by a recess, for example, through a structural change in an area of ​​the sheet material (not shown). In particular, if a device 39 for defining a bending zone 40 is present in the second section 20 and / or the first section 13, the shape changes during clamping can be predetermined with particular precision.With such a device 39, the material, in particular sheet metal material, of the first section 13 and / or the second section 20 can be designed to be strong enough to withstand an explosion on the one hand and flexible enough to keep the force required for deformation to form the flameproof intermediate region 32 small on the other hand.

[0062] In Figure 5 The area which is closed during clamping in such a way that it complies with the requirements for an explosion-proof gap is marked with a thicker line.

[0063] Figures 6a and 6billustrate a further embodiment of the invention. The shape and / or position of the first surface 33 of the first section 13 and the shape and / or position of the second surface 34 of the second section 20 are intended to form an intermediate region 32 when the first housing part 11 and the second housing part 18 are assembled to close the housing 10. Without sufficient bracing of the first housing part 11 and the second housing part 18, the intermediate region 32 has a gap outside the flameproof region. The first housing part 11 and the second housing part 18 are therefore designed and intended, when assembled as predetermined but not bracing, to delimit a gap in the separation point, which only assumes flameproof gap dimensions due to the bracing and the resulting deformation of the first housing part 11 and / or the second housing part 18. In the Figure 6a, 6b, 6c In the illustrated embodiment, the beads are V-shaped. The figures show a further example in which the deformed first section 13 and / or the deformed second section 20 have a kink and / or a curvature 25, 29.

[0064] The kink and / or bend 25, 29 preferably forms an elongated groove shape which extends transversely to the relevant (effective) length of the intermediate region 32. The relevant length of the intermediate region 32 is measured from the entrance of the intermediate region 32 to the exit of the intermediate region 32. The length of the intermediate region 32 measured in a straight line from the entrance of the intermediate region 32 to the exit of the intermediate region 32 can, with the kink or bend, be much shorter than the effective length of the intermediate region 32. The effective length of the intermediate region 32 determines the ignition resistance or ignition safety of the intermediate region 32. It is assumed that when the gas takes a path through the intermediate region 32 corresponding to the effective length, it has cooled down sufficiently that it can no longer trigger an explosion at the exit of the intermediate region 32.

[0065] Small wall thicknesses make the use of sheet metal constructions and sheet metal technologies possible. By shaping sheet metal elements using known sheet metal forming processes, e.g. deep drawing, metal spinning, rolling, beading, bending, high-pressure forming, stretch forming, spinning, drawing, laser beam bending, etc., pairs of sheets can be formed as first and second sections. These pairs can be deformed in the elastic range of the sheet and which delimit a sheet-metal-formed gap geometry of the intermediate region. The two sheet metal sections delimiting the intermediate region can be deformed by clamping in such a way that the intermediate region is closed to form an explosion-proof gap. This does not mean that the intermediate region is gas-tight, but it does mean that no gases or particles can leave the intermediate region so hot that they could ignite an atmosphere outside the housing 10.

[0066] The Figures 6a to 6c and 7show embodiments in which the first housing part 11 and the second housing part 18 have non-complementary V-shapes, so that the sheet metal-formed gap geometry is also V-shaped. The wall surface 33 of the sheet metal section 13 of the first housing part 11 and the sheet metal section 20 of the second housing part 18, which lie opposite one another and delimit the intermediate region 32 between them, enclose different angles α1, α2. In the embodiment according to Figures 6a and 6bthe outer surface 34 of the back-shaped section 20 of the second housing part 18 is V-shaped in cross-section and defines a smaller opening angle α2 than the wall surface 33 of the sheet metal section 13 of the first housing part 11, which delimits the elongated receptacle 30. This defines a support region 31 at the bottom of the elongated receptacle 30. At the free ends of the sheet metal sections 13, 20, the distance between the first housing part (distance a) is greater (in the unstressed system) than in the support region 31. The intermediate region 32 therefore opens increasingly outwards. In the support region 31, the distance (b) can, for example, be 0 or, if an intermediate element is arranged between the sheet metal section 13 of the first housing part 11 and the sheet metal section 20 of the second housing part 18, greater than 0.The distance in the unstressed state can also be greater than 0 in places if the first housing part 11 and the second housing part 18 only touch at certain points in the unstressed state due to rough manufacturing tolerances.

[0067] The opening angle α1 of the receiving bead 25 is greater than the opening angle α2 defined by the surface 34 of the sheet metal section 20 of the second sheet metal part 18, which faces the first sheet metal part 11. As indicated by the arrows, force introduction areas are defined inside and outside the circumference defined by the intermediate region 32. Subsections of the sheet metal sections 13, 20 are pressed in opposite directions against the counter-section 13, 20. Unstressed contact or unstressed state means that the first section 13 and the second section 20 are not yet pressed against each other in a flameproof manner, closing the intermediate region 32.

[0068] As in Figure 6bAs can be seen, the sheet thickness of the first housing part 11 is greater than the sheet thickness of the second housing part 18. During clamping, the shapes of the beads adapt to one another, so that the difference in the angles α1, α2 of the mutually facing surfaces 33, 34 of the first sheet part 11 and the second sheet part 18 is smaller in the clamped state than in the non-clamped state. Due to the different sheet thicknesses, which result in different compliance, certain areas of the second section 20 of the second housing part 18 cover a larger section of the distance S, which must be covered for ignition-proof deformation, compared to the areas of the first section 13 of the first housing part 11.

[0069] The distance S, which the first housing part 11 and the second housing part 18 must at least partially cover towards each other in order to close the intermediate region 32 to zero or at least to such an extent that ignition safety is ensured, is in Figure 6c illustrated. Due to the sheet thickness, the material, the structure, the shape and / or other properties, the distance S can be covered predominantly (more than half) by the second housing part 18 or the first housing part 11, depending on which housing part 11, 18 is correspondingly more flexible.

[0070] From the bottom of the receptacle 30, the intermediate region 32 opens increasingly inward due to the different opening angles α1, α2. Within the circumference defined by the receptacle 30 and / or the intermediate region 32, the distance c between the sheet metal section 13 of the first housing part 11 and the second housing part 18 can be approximately equal to the distance a (when in contact and in the unclamped state).

[0071] In the embodiment according to Figure 7The surface 34 of the back region of the sheet metal section 20 of the second housing part 18 encloses a larger opening angle α2 than the opposite surface 33 of the sheet metal section 13 of the first housing part 11. The distance b between the tip of the back and the bottom 26 of the elongated recess 25 is greater than the distance a, c of the sheet metal section 13 of the first housing part 11 and the sheet metal section 20 of the second housing part 18 inside and / or outside the circumference which is defined by the tip of the back 38. Preferably, b > a and a > c apply.

[0072] The arrows in the Figures 6a, 6b and 7illustrate examples of possible force application points for bracing the first housing part 11 and the second housing part 18, so that the intermediate region 32 between the sheet metal section 13 of the first housing part 11 and the sheet metal section 20 of the second housing part 18 is closed in an ignition-proof manner by the bracing and the associated elastic deformation of the sheet metal section 13 of the first housing part 11 and the sheet metal section 13 of the second housing part 20.

[0073] In embodiments according to Figure 7In the unstressed state, but when the second housing part 18 and the first housing part 11 are in a suitable position for bracing, the intermediate region 32 opens increasingly from the inside outwards to the bottom 26 of the receptacle 25 and from the outside inwards to the bottom 26 of the receptacle 25. The distance S for closing the intermediate region 32 so that it is flameproof is, due to the smaller thickness of the material of the second housing part 18, predominantly covered by the frame section 20 of the second housing part 18, which is more flexible than the flange section 13 due to the smaller thickness.

[0074] The Figures 8a to 8bshows an embodiment with a first housing part 11 and a flange section 13, which is an inwardly projecting section of the first housing part 11. The flange section 13 forms an elongated recess 30, which can be V-shaped or U-shaped, for example. The second housing part 18 forms a back 38, which is arranged in the recess 30 in the unstressed state and even more so in the stressed state, when the first housing part 11 and the second housing part 18 abut one another to be stressed or in the stressed state. An intermediate frame 45 is arranged between the sheet metal section 13 of the first housing part 11 and the sheet metal section 20 of the second housing part 18, so that the first section 13 of the first housing part 11 and the second section 20 of the second housing part 18 abut one another not directly, but rather mediated via the intermediate frame 45.The intermediate frame 45 is a separate part from the first housing part 11 and the second housing part 18, but can be connected, in particular glued, to the first housing part 11 or the second housing part 18. The intermediate frame 45 can be made of plastic, while the first housing part 11 and the second housing part 18 can be made of the same plastic, a different plastic, or metal. The elastic deformability of the intermediate frame 45 can be greater than the deformability of the sheet metal section 13 of the first housing part 11 and the second housing part 18, which are opposite one another.If the sheet metal section 13 of the first housing part 11 and the sheet metal section 20 of the second housing part 18 are clamped together, the shape of the first sheet metal section 13 of the first housing part 11 and the shape of the second sheet metal section 20 of the second housing part 18 approach one another relative to one another due to elastic deformation of the first housing part 11 and / or the sheet metal section 20 of the second housing part 18. Even in the clamped state, the shape of the sheet metal section 13 of the first housing part 11 and the sheet metal section 20 of the second housing part 18 does not necessarily have to be complementary. The elastically flexible intermediate frame 45 can support the flame-proof closure of the deformation of the second section 20 and / or the first section 13 in that the deformation of the intermediate frame 45 fills gaps and thus contributes to an overall flame-proof intermediate region 32.

[0075] In the Figures 9aand 9b a further embodiment of sheet metal sections 13, 20 of a first housing part 11 and a second housing part 18 of a housing 10 according to the invention, which are not complementary to one another in the unstressed state, is shown. Figure 9ashows a section of an explosion-proof housing 10 according to the invention between two parallel sectional planes. At least one subsection of the sheet metal section 13 of the first housing part 11 and at least one subsection of the sheet metal section 20 of the second housing part 18 form an angle β of less than 90° with the wall 12 of the housing 10. The free end of the sheet metal section 13 of the first housing part 11 and of the sheet metal section 20 of the second housing part 18, which form spiral springs to close an intermediate region 32 between them in a flameproof manner during clamping, is arranged between the opening plane and the opposite rear or bottom plane of the housing 10.

[0076] The embodiment according to Figures 9a , 9bdoes not require a trough-shaped and / or elongated depression 30 and corresponding protrusions 38, which may, for example, be ridge-shaped. However, modifications of the embodiment according to Figures 9a , 9b possible in which a recess 30, in particular a trough and / or elongated recess, is formed in the first sheet metal section 13 and / or the second sheet metal section 20, into which a protrusion 38, in particular a ridge, of the other sheet metal section 20 is arranged. While examples are shown in which the first housing part 11 forms the receptacle 30 and the second housing part 18 forms the ridge, additionally or alternatively the first housing part 11 can form the ridge 38 and the second housing part 18 can form the receptacle 30.

[0077] In the Figure 9a , 9bIn the exemplary embodiment shown, when the second housing part 18 rests (distance b greater than or equal to 0) on the first housing part 11 (directly or mediated (not shown) via an intermediate element 45), the intermediate region 32 opens in a wedge shape due to different angles γ1, γ2 of the second section 20 and the first section 13 to a reference plane, increasing towards the free end of the section 13 of the first housing part 11 and the section 20 of the second housing part 18. The sheet metal section 13 of the first housing part 11 and / or the sheet metal section 20 of the second housing part 18 can have a device 39 for defining a bending zone 40. The device 39 can, for example, consist of a notch in the section of the first housing part 11 and / or a notch in the section of the second housing part 18. Other possibilities are a change in the structure, for example by heating and / or forming.

[0078] Between the second section 20 and the first section 13, an intermediate region 32 with a wedge-shaped gap is formed, which is narrowed by tensioning in order to close it in a flameproof manner. In a system based on the shape of the first housing part 11 and the second housing part 18, as in Figure 9a , 9b shown, where there is a smaller distance between the sections on the inside than on the outside, the force is distributed during clamping so that the greatest contact force prevails on the inside in order to prevent expansion at this point due to an explosion.

[0079] Figure 9c shows a modification of the example according to Figures 9a , 9b In this variation, the intermediate region 32 expands from the outside to the inside (b>a).

[0080] Figures 10a and 10bshow an embodiment of a housing 10 according to the invention, in which the flange section 13 of the first housing part 11 and the counter section 20 (an imaginary frame-shaped section) of the second housing part 18 have complementary desired shapes. In the illustrated embodiment, the first section 13 and the second section 20 have flat, complementary desired shapes. However, the first section 13 and the second section 20 are manufactured with tolerances that are so coarse that only the elastic deformation of the first section 13 and / or the second section 18 due to the bracing closes the intermediate region 32 between the first housing part 11 and the second housing part 18 in an ignition-proof manner. Contact of the second housing part 18 with the first housing part 11 without bracing does not yet reliably result in a geometry of the intermediate region 32 that is ignition-proof.The first section 13 of the first housing part 11 and the second section 20 of the second housing part 18 can, for example, have a wall thickness of a maximum of 5 mm, preferably a maximum of 3 mm, particularly preferably a maximum of 2 mm. With such a small wall thickness, even a small applied force during clamping is sufficient to achieve a deformation that closes the intermediate region 32 in a flameproof manner. As in the other exemplary embodiments, the first section 13 and / or the second section 20 can be made of sheet metal, in particular sheet steel or aluminum, or of plastic.

[0081] Figure 10bshows the housing parts braced against each other. A bracing device 36 is used for this purpose. The bracing device 36 can have a first, for example frame-shaped, block 50 and a second, for example frame-shaped, block 51, which are pressed against each other by means of clamps in order to press the frame section 20 and the flange section 13 against each other between them. Due to the force coating, an ignition-proof separation point 32 is achieved, which, even in the event of an explosion in the interior 14 of the housing 10, does not allow any hot gas and / or particles to escape that would be suitable for igniting the surrounding area 15. The intermediate region 32 between the first housing part 11 and the second housing part 18 is closed except for an ignition-proof gap, for example an O-gap.

[0082] In Figure 10c, on the left, a side view is very schematically illustrated that the first section 13 and / or the second section 20 can have a strong wave shape due to rough manufacturing tolerances. Figure 10c shows a Figure 10b alternative bracing device 36. In a modification of the embodiment according to Figures 10a, 10b the first section 13 and the second section 20 in the embodiment according to Figure 10c Recesses 52, 53, in particular holes, for the passage of bolts 54, in particular screws. The block(s) 50, 51 have corresponding recesses 55, 56, in particular holes, for receiving the bolts 54, which are guided through the recesses 52, 53 in the first section 13 and the second section 20. Block 50 and / or block 51 can in particular have threaded holes. Figure 10c, on the right, shows a sectional view along a section of the circumference of the first housing part 11 or the second housing part 18, the bracing device 36 in the braced state. The blocks 50, 51 press towards one another by means of the bolt connection 54, so that the first section 13 and the second section 20 are braced together and the intermediate region 32 is thereby sealed off from the elastic deformation of the first section 13 and / or the second section 20 in a flameproof manner. The gap width shown, which is different from zero in some sections, between the first section 13 and the second section 20 illustrates that flameproof safety is provided with a sufficiently large length and a small width of the gap-shaped intermediate region 32, these two variables being related.There is sufficient distance between the recesses 52, 53 in the first section 13 and the second section 20 for receiving the bolts 54 and the interior 14 of the housing 10, so that the intermediate region 32, measured from the interior 14 to the recesses 52, 53, has a sufficient length for the ignition breakdown safety.

[0083] Figure 11a shows an exemplary view of the surface 33 of the section 13 of the first housing part 11 of the Figures 10a and 10b . Figure 11bshows another example. Hatched areas 46 are those in which the surface 34 of the second section 13 of the second housing part 18 already adjoins the first housing part 11 in the unstressed state. These areas 46 are of random size and shape, e.g., island-shaped and / or strip-shaped, and are randomly distributed over the surface 33 of the first housing part 11. The geometry of the intermediate space 32 through an area 46 and / or between two areas 46 is not flameproof in the unstressed state. As explained in connection with the Figures 10a and 10b As explained, the intermediate region 32 is only geometrically narrowed by the elastic deformation in such a way that it is flameproof.

[0084] The Figures 12a, 12b illustrate examples of the inventive methods 100, 200. In Figure 121 illustrates, by way of example, a method 100 for producing a housing 10, for example a housing 10 as described above in connection with Figures 1 to 11c. The method comprises selecting 101 a first section 13 and a second section 20 for delimiting an intermediate region 32 of the housing 10, wherein at least one of the sections 13, 20 is a wall section. The first section 13 and the second section 20 are selected such that the first section 13 and the second section 20 can be pressed against one another by means of a bracing device 36 with elastic deformation of the wall section 13, 20 (block 102), so that the intermediate region 32 is geometrically closed in an ignition-proof manner by the elastic deformation of the wall section 13, 20. The first section 13 and the second section 20 are selected to match each other in terms of shape, wall thickness, material, elastic modulus, etc.that the intermediate area 32 can be closed geometrically in a flameproof manner by the deformation.

[0085] In embodiments in which the first section 13 and the second section 20 are each sheet metal sections, an intermediate region 32 with an elastically adaptable sheet metal gap geometry is formed by the system, which is geometrically narrowed by the deformation of the at least one wall section 13, 20 in order to close it in a manner that is safe from ignition penetration.

[0086] Figure 12billustrates a method 200 for producing an explosion-proof connection between a first section 13 of a first housing part 11 having a first surface 33 and a second section 20 of a second housing part 18 having a second surface 34 of a housing 10, as described, for example, in connection with Figures 1 to 11c. At least one of the sections 13, 20 is a wall section. The method 200 comprises assembling 201 the first housing part 11 and the second housing part 18 to close the housing 10. When the first housing part 11 and the second housing part 18 are assembled, the first surface 33 and the second surface 34 delimit an intermediate region 32 having a gap dimension outside an ignition-proof region.A force is applied 202 to the sections 13, 20, whereby the sections 13, 20 are pressed against one another with elastic deformation of at least one wall section 13, 20, so that the intermediate region 32 is geometrically closed in a flameproof manner by the elastic deformation of the wall section 13, 20. In embodiments, the first section 11 and the second section 18 are deformed toward one another, whereby the first section 11 and the second section 18 cover different portions of the distance S required for flameproof closure depending on their elastic flexibility. The deformation is used geometrically to close the intermediate space 32.

[0087] Preferably, the connection is re-establishable. For this purpose, the clamping is released 203 and the second housing part 18 is removed 204 from the first housing part 11. The second housing part 18 and the first housing part 11 can be brought into contact again to restore 205 the connection and the method according to Figure 12b can be used repeatedly.

[0088] An explosion-proof housing (10) is specified which forms an interior space 14 for accommodating components 16 which can form ignition sources. The housing has a first housing part 11 with a first section 13 which has a first surface 33, and a second housing part 18 with a second section 20 which has a second surface 34, wherein the first section 13 and / or the second section 20 is a section of a wall 12, 19, wherein the first surface 33 and the second surface 34 delimit an intermediate region 32. The first section 13 and the second section 20 are pressed against one another with elastic deformation of the wall section 13, 20, such that the intermediate region 32 is geometrically closed in a way that is safe from ignition penetration by the elastic deformation of the wall section 13, 20.A method 200 is also specified for producing an explosion-proof connection between a first section 13 of a first housing part 11 having a first surface 33 and a second section 20 of a second housing part 18 having a second surface 34 of a housing 10, wherein at least one of the sections is a section 13, 20 of a wall. A further method 200 is specified for producing an explosion-proof connection between a first section 13 of a first housing part 11 having a first surface 33 and a second section 20 of a second housing part 18 having a second surface 34 of a housing 10, wherein at least one of the sections is a section 13, 20 of a wall 12, 19. List of reference symbols:

[0089] 10 Housing 11 First housing part 12 Wall 13 First section / wall section / flange section 14 Interior 15 Vicinity 16 Components 17 opening 18 Second housing part 19 Wall 20 Second section / wall section / edge section 21a Pressure relief opening 21b Pressure relief body 22 External pressure relief device 23 Internal pressure relief device 24 Porous material 25 bead 26 Floor 27a Pressure relief opening 27b Pressure relief body 28 external pressure relief device 29 Further bead 30 Recording 31 Support area 32 Intermediate area 33 First area 34 Second area 35 Bracing area 36 Bracing device 38 Back 39 Furnishings 40 Bending zone 45 intermediate frame 46 Area 50 block 51 block 52 recess 53 recess 54 bolt 55 recess 56 recess 100 Proceedings 101 Choose 200 Proceedings 201 Assemble 202 Apply 203 Releasing the tension 204 Remove 205 Reconnect r1 radius r2 radius α1 angle α2 angle β angle S Route

Claims

1. An explosion-proof housing (10) which forms an interior (14) for accommodating components (16) that can form ignition sources, with a first housing part (11) that has a first section (13) that comprises a first surface (33) and a second housing part (18) that has a second section (20) that comprises a second surface (34), wherein the first section (13) and / or the second section (20) is a wall section, wherein the first surface (33) and the second surface (34) delimit an intermediate region (32), wherein the first section (13) and the second section (20) are pressed against one another by means of a clamping device under elastic deformation of the wall section (13, 20), so that the intermediate region (32) is geometrically closed in a flameproof manner by the elastic deformation of the wall section (13, 20).

2. The housing (10) according to claim 1, wherein the first section (13) is a sheet section and / or the second section (20) is a sheet section.

3. The housing (10) according to claim 2, wherein the sheet thickness of the first section (13) and / or the second section (20) is a maximum of 5 millimeters or preferably a maximum of 3 millimeters.

4. The housing (10) according to any of the preceding claims, wherein the first section (13) is part of a first housing part (11) and the second section (20) is part of a second housing part (18), wherein the first section (13) and the second section (20) enclose an angle when the first housing part (11) and the second housing part (18) abut against one another in the non-clamped condition due to the geometric desired shape of the first section (13) and the second section (20).

5. The housing (10) according to any of the preceding claims, wherein the width of the intermediate region (32) increases from a support region (31) in the direction toward the environment (15) of the housing (10) and / or in direction toward the interior (14) when the first housing part (11) and the second housing part (18) abut against one another in the non-clamped condition due to the desired shape of the first housing part (11) and the second housing part (18).

6. The housing (10) according to any of the preceding claims, wherein the second section (18) is supported on the first section (11) during flameproof closing of the intermediate region (32) by elastic deformation directly or indirectly in a defined support region (31), wherein the support region (31) forms an inner edge of the intermediate region (32) and / or wherein the support region (32) is arranged between an inner edge and an outer edge of the intermediate region (32).

7. The housing (10) according to any of the preceding claims, wherein the first section (13) and / or the second section (20) forms an elongated receptacle (30) and wherein the second section (20) and / or the first section (13) comprises at least one elongated dome (38) that is located inside the receptacle (30).

8. The housing (10) according to any of the preceding claims, wherein at least one elastically deformed intermediate element (32) is arranged between the first section (11) and the second section (18), via which the first section (11) and the second section (18) are pressed against one another.

9. The housing (10) according to claim 8, wherein the intermediate element (32) is frame-shaped.

10. The housing (10) according to any of the preceding claims, wherein the first surface (33) of the first section (13) delimiting the intermediate region (32) and / or the second surface (34) of the second section (18) delimiting the intermediate region (32) is orientated obliquely relative to a wall (19) of the housing (10).

11. The housing (10) according to any of the preceding claims, wherein the first section (13) and / or the second section (20) comprises a device (39) for defining a bending zone (40).

12. The housing (10) according to any of the preceding claims, wherein the housing (10) is reclosable.

13. The housing (10) according to any of the preceding claims, wherein an internal pressure relief device (23) and / or an external pressure relief device (22, 28) is assigned to the housing (10).

14. A method (100) for manufacturing a flameproof housing (10), for example according to any of the preceding claims, wherein the method (100) comprises: selecting (101) a first section (13) and a second section (20) for delimiting an intermediate region (32) of the housing (10), wherein at least one of the sections (13, 20) is a wall section, such that the first section (13) and the second section (20) can be pressed against one another under elastic deformation of the wall section (13, 20) by means of a clamping device, so that the intermediate region (32) is geometrically closed in a flameproof manner by the elastic deformation of the wall section (13, 20).

15. A method (200) for establishing an explosion-proof connection between a first section (13) of a first housing part (11) having a first surface (33) and a second section (20) of a second housing part (18) having a second surface (34) of a housing (10), for example according to any of the claims 1 to 13, wherein at least one of the sections is a wall section (13, 20), comprising the steps: - assembling (201) the first housing part (11) and the second housing part (18) in order to close the housing (10), wherein the first surface (33) and the second surface (34) delimit an intermediate region (32) comprising a gap dimension outside a flameproof range, - applying (202) a clamping force on the sections (13, 20) such that the sections (13, 20) are pressed against one another under elastic deformation of the wall section (13, 20), so that the intermediate region (32) is geometrically closed in a flameproof manner by the elastic deformation of the wall section (13, 20).

16. The method (200) according to the preceding claim, wherein a distance (S) for closing the intermediate region (32), so that it is flameproof, is predominantly covered by the deformation of the wall section (13, 20).