EP3918680A1

EP3918680A1 - Explosion-proof apparatus with a flameproof gas flow path and heat sink

Info

Publication number: EP3918680A1
Application number: EP20701435.8A
Authority: EP
Inventors: Elena Kondrus; Jürgen Schmitt; Bernd Limbacher
Original assignee: R Stahl Schaltgeraete GmbH
Current assignee: R Stahl Schaltgeraete GmbH
Priority date: 2019-01-31
Filing date: 2020-01-20
Publication date: 2021-12-08
Also published as: DE102019102505A1; CN113396514A; US20220132692A1; WO2020156848A1; US12029001B2; DE102019102505B4

Abstract

The invention relates to an explosion-proof apparatus (20) with an explosion-proof housing (21) and a cooling device (43). The explosion-proof housing (21) has a plurality of outer walls (25-29) which enclose a housing interior (22) in an explosion-proof manner with respect to a surrounding area (23). A pressure-relief arrangement (32) of the cooling device (43) has at least one pressure-relief opening (33) with at least one gas-permeable, flameproof pressure-relief body (34). The at least one pressure-relief opening (33) passes through at least one of the outer walls (25-29). Thus, a flameproof gas flow path is formed between the housing interior (22) and the surrounding area (23). The cooling device (43) also has at least one heat sink (44) which forms at least one heat sink wall part (47) of one the outer walls (25, 26, 27, 28, 29) and which, as a heat sink wall part (47) of this outer wall (25, 26, 27, 28, 29), directly borders, on its outer face, the surrounding area (23) and directly borders, on its inner face, the housing interior (22). As a result of the explosion-pressure limiting action of the pressure-relief arrangement (32), a standard heat sink can be used to form the heat-sink wall part (47), which heat sink is formed, for example, by an extruded profile part.

Description

Explosion-proof device with flame-proof gas flow path and heat sink

The invention relates to an explosion-proof device with an explosion-proof housing. The housing has several outer walls that surround an interior of the housing and separate it explosion-proof from a potentially explosive atmosphere in one environment.

Such a device is known for example from DE 10 2012 110 001 A1. There, an explosion-proof housing is proposed which only generates a gas flow within the housing. The heat generated in the interior of the housing, which arises from the operation of electrical or electronic devices, is dissipated to the outside by heat conduction through the housing walls. Here, heat sinks can be present on the inside or outside of a housing wall.

The heat emission from an interior of an explosion-proof housing to the environment is an extremely critical point in explosion-proof devices. On the one hand, the electrical and / or electronic devices arranged and to be cooled in the interior of the housing have to be cooled sufficiently to maintain their functionality. On the other hand, it must be possible to safely rule out ignition of the potentially explosive environment. The temperature of the outer walls of the explosion-proof housing is also no critical temperature values, since the outer walls of the housing can otherwise serve as an ignition source for the surrounding potentially explosive atmosphere.

It can therefore be regarded as an object of the present invention to further develop an explosion-protected device in such a way that it offers improved explosion protection.

This object is achieved by the explosion-proof device with the features of claim 1 ge.

The explosion-proof device has an explosion-proof housing with several outer walls. The outer walls enclose an interior of the housing and separate it from a potentially explosive atmosphere in the vicinity of the explosion-proof housing. The explosion-proof device has a pressure relief arrangement with at least one gas-permeable, ignition-proof, pressure relief body. The pressure relief arrangement also includes at least one pressure relief opening which completely penetrates at least one of the outer walls of the explosion-proof housing. In each pressure relief opening, at least one of the pressure relief bodies is arranged, the at least one pressure relief body permeably covering the pressure relief opening in such a way that an ignition-proof gas flow path is formed through the relevant pressure relief opening and the pressure relief body. The Druckent relief body can at least partially within the assigned pressure relief opening and / or at least partially outside the assigned pressure relief opening be arranged. For example, the pressure relief body can be completely accommodated in the pressure relief opening. Alternatively, it is also possible to mount a pressure relief body adjacent to the pressure relief opening on the outer wall section, which surrounds the pressure relief opening in question, for example in the housing interior or on the outside adjacent to the surroundings.

The explosion-proof device also has a cooling device with at least one heat sink. The cooling device is set up to give off heat from the interior of the housing to the outside. In example, one or more electrical and / or electronic devices can generate heat in the interior of the housing, which is then dissipated to the outside by means of the cooling device.

The at least one heat sink forms at least part of at least one of the outer walls of the housing. The at least one heat sink can either we at least completely form an outer wall or only form part of at least one outer wall and each part of the at least one outer wall formed by a heat sink is referred to as a heat sink wall part for better differentiation. In contrast, the area (s) of one or more outer walls that are not formed by a heat sink is referred to as the housing wall part (s). The at least one heat sink wall part and the at least one housing wall part together form the outer walls of the housing.

The at least one heat sink wall part borders on the outside as well as on the inside on the housing interior immediately. As a result, the heat sink can conduct heat directly from its side facing the housing interior to the environment facing the environment via heat conduction.

The at least one heat sink consists of a heat-conducting material, for example made of metal or a metallic alloy and can contain aluminum or copper, for example. The at least one heat sink can also consist of ceramic or another material. Its thermal conductivity is preferably greater than the thermal conductivity of the at least one housing wall part of the outer walls.

[0011] The at least one heat sink can be painted or anodized.

[0012] The at least one gas flow path which is resistant to ignition breakdown creates a pressure relief option in the event of an explosion within the interior of the housing. The gas or explosion pressure, which the housing including the outer walls and the at least one heat sink must withstand, is considerably reduced by the pressure relief arrangement. This makes it possible to form the at least one housing wall part by a standard heat sink, which can be designed, for example, as an extruded profile part. Such heat sinks are available inexpensively on the market. An adaptation of the at least one heat sink to increase the strength in order to be part of an explosion-proof housing is not necessary according to the invention. The flow cross section of the one or more gas flow paths of the pressure relief arrangement is selected such that that the explosion pressure in the interior of the housing is limited to a given maximum pressure value.

Part of the cooling effect can also be carried out by convection, in that air flows out of the housing interior along the at least one gas flow path of the pressure relief arrangement to the outside. Preferably, the proportion of heat that is emitted to the outside via a gas or air flow through the pressure relief arrangement is significantly smaller than the heat that is dissipated via conduction to the outside via the at least one heat sink. For example, the heat portion dissipated to the outside via the at least one heat sink can amount to at least 80% to 90% of the heat generated in the interior of the housing.

By means of the cooling device and the heat dissipation from the interior of the housing into the environment is also avoided that there are locally high wall temperatures on the outer walls of the housing, which can serve as a source of ignition for the potentially explosive atmosphere in the vicinity of the housing.

In a preferred embodiment, the at least one heat sink or at least one heat sink of one or more existing heat sinks is inserted in an associated wall recess in one of the outer walls. This wall recess penetrates the outer wall completely. The remaining housing wall part can form a frame or edge of the wall recess and completely enclose it. The heat sink can, for example, by means of an adhesion promoter connection in the wall recess with the surrounding or adjacent housing wall part of one or be connected to several outer walls.

[0016] The heat sink wall part can be connected to a housing wall part by an adhesion promoter connection. Since no heat-conducting connection is required between the at least one heat sink and the at least one housing wall part, a simple adhesive connection, in particular an adhesive connection, can be produced. The resulting heat barrier is unproblematic. Measures for producing a thermal conductivity between the at least one heat sink or the at least one heat sink wall part and the at least one housing wall part are not required.

The at least one heat sink can be non-positively and / or positively and / or cohesively and / or arranged by means of adhesion, for example by screwing and / or clamping and / or gluing and / or clamps and / or on the housing wall part concerned Welding and / or the like.

The at least one heat sink can be made integrally or formed from several parts. For example, the at least one heat sink can be designed as an extruded profile.

[0019] The at least one heat sink can have cooling fins arranged in the interior of the housing and / or cooling fins arranged in the vicinity. This improves the heat absorption in the interior of the housing and the heat dissipation in the surrounding area.

[0020] The cooling fins are preferably in a vertical calender plane, in particular such that a gap between two adjacent cooling fins runs essentially vertically. As a result, heated gas rising vertically upwards can flow better between the cooling fins.

The at least one heat sink can be designed in such a way that its cooling surface adjacent to the surroundings or to the interior of the housing is at least a factor of 2 or 3 or 4 larger than the cross-sectional area of the heat sink wall part formed by the at least one heat sink.

One of the outer walls of the housing can be at least partially designed as a door, flap or lid to allow access to the interior of the housing. The at least one heat sink can be arranged on or in any of the outer walls and, for example, also in or on the door, the flap or the cover. It is advantageous if, for example, a heat sink wall part formed by a heat sink forms the door, the flap or the cover of the housing.

[0023] The cooling surface of the at least one heat sink can be anodized or painted. This can increase the emissivity.

[0024] In one embodiment, the at least one gas-permeable, ignition-proof pressure relief body has an inner side directly adjacent to the housing interior and an outer side directly adjacent to the surroundings. The at least one pressure relief device can be on the inside and / or outside Have area that is larger than the remaining surface of the relevant outer wall or the relevant housing wall part. The pressure relief body can also form the entire outer wall.

In one embodiment, at least one pressure relief opening with a pressure relief body is present in an upper outer wall of the housing. Additionally or alternatively, at least one pressure relief opening with a pressure relief body can be present in at least one lateral outer wall. Additionally or alternatively, at least one pressure relief opening with a pressure relief body can be present in a lower outer wall. It is particularly advantageous if there is at least one pressure relief opening with a pressure relief body in each case because there are two opposite outer walls.

[0026] Either a heat sink or a pressure relief body is preferably present on an outer wall. In this embodiment, the outer wall in question serves neither to have at least part of the gas flow path or to provide heat conduction through at least one heat sink.

In a preferred embodiment, at least one attachment surface for an electrical and / or electronic device to be cooled is present in the housing interior. The attachment surface — or in the case of a plurality of attachment surfaces, at least one of the attachment surfaces — is formed in one exemplary embodiment on the side of the at least one heat sink facing the housing interior. Thus, the electrical and / or electronic The device can be arranged directly on the attachment surface of the at least one heat sink, so that particularly good heat transfer from the electrical and / or electronic device to the heat sink can be achieved.

[0028] Alternatively or additionally, at least one attachment wall can be present in the housing interior, on which one or more attachment surfaces are formed. In this embodiment, the at least one heat sink can be connected in a heat-conducting manner to the attachment wall, in particular in particular directly or by means of a heat-conducting intermediate layer. Such an intermediate layer can, for example, be a thermal adhesive, a thermal pad or a thermal paste. A thermal pad can consist, for example, of mica and / or silicone rubber and / or polyimide. In particular, the indirect or direct connection between the at least one attachment wall and the at least one heat sink is such that there is no gas or air gap between the at least one heat sink and the at least one attachment wall. As he explains, there may optionally be thermally conductive intermediate layers to improve the thermal contact.

[0029] In one embodiment, the cooling device has at least one fan. The fan is in particular arranged in the interior of the housing. This can further improve cooling by convection.

In a preferred embodiment, the housing is designed in the “flameproof enclosure (Ex-d)” type of protection according to DIN EN 60079-1. [0031] Advantageous embodiments of the explosion-proof device result from the dependent claims, the description and the drawings. According to the following preferred embodiments are explained in detail with reference to the accompanying drawings. Show it:

1 shows a schematic block diagram-like

Representation of an embodiment of an explosion-protected device,

FIGS. 2 and 3 each show a schematic illustration similar to a block diagram for arranging at least one heat sink in an outer wall of an explosion-protected housing,

FIG. 4 shows a view of an outer wall of an explosion-proof housing with at least part of a pressure relief arrangement,

FIG. 5 shows a schematic cross-sectional representation through the outer wall from FIG. 4,

FIGS. 6 and 7 each show a schematic perspective view of a structure or a structure for forming a gas-permeable, flame-proof pressure relief body,

Figures 8-12 each show an embodiment of an explosion-proof device with an explosion-proof housing in a perspective view.

Figure 1 shows a sectional view of an exemplary embodiment of an explosion-proof device 20 having an explosion-proof housing 21. The explosion-protected housing 21 can be of the explosion-proof encapsulation type (Ex-d) in accordance with DIN EN 60079-1. It encloses a housing interior 22 and separates it explosion-proof from an environment 23 in which there is an explosive atmosphere. One or more electrical and / or electronic devices 24 can be arranged in the housing interior 22. Since such devices 24 as a possible ignition source for the potentially explosive atmosphere in the environment 23 can NEN, they are recorded explosion-proof in the housing interior 22.

The explosion-proof housing 21 has several

Outer walls 25-29 which enclose the housing interior 22. For example, the explosion-proof housing 21 is designed qua-shaped. It has an upper outer wall 25 (see FIGS. 4 and 8-12), which is opposite a lower outer wall 26. The upper outer wall 25 and the lower outer wall 26 are connected to one another by a rear outer wall 27, a front outer wall 28 and two lateral outer walls 29. The rear outer wall 27 and the front outer wall

28 face each other. The two outer side walls

29 also lie opposite each other and connect the rear outer wall 27 to the front outer wall 28. The upper outer wall 25 cannot be seen in FIG. 1 due to the vertical sectional view.

The outer walls 25-29 can be connected to one another, for example by welding, gluing or another suitable type of connection. At least some of the outer walls 25-29 can also be integrally formed, for example by being produced integrally, for example by pouring at least some or all of the outer walls 25-29.

It goes without saying that the explosion-proof housing 21 can deviate from the cuboid shape and also take other shapes, for example a cylindrical shape.

The explosion-proof device 20 also includes a cooling device 43. The cooling device 43 is designed to dissipate heat from the housing interior 22 into the environment 23 in order to keep the temperature in the housing interior 22 sufficiently low so that the functionality of the at least one electrical and / or electronic device 24 is ensured. In addition, the cooling device 43 is set up to keep the temperature of the outer walls 25-29 below a limit value, so that the outer walls 25-29 do not represent a source of ignition for the potentially explosive atmosphere in the environment 23.

[0043] The cooling device 43 has at least one heat sink 44. The heat sink 44 preferably has at least on its outer side facing the environment 23 one or more cooling fins 45 and / or cooling vanes

and / or cooling fins to increase its cooling surface. The heat sink 44 forms at least part of an associated outer wall 25 to 29, which is referred to as the heat sink wall part 47. The heat sink 45 can either form the entire outer wall 25 to 29 in question or be arranged in a wall recess 46 of an associated outer wall 25 to 29. The at least one heat sink 44 consequently represents at least one heat sink wall part 47, the part with a remaining housing wall part 48 is connected, which surrounds the relevant wall recess 46. Between the at least one heat sink 44 and the surrounding housing wall part 48, there can be an adhesive connection, for example an adhesive connection.

The at least one heat sink 44 is preferably made of a material whose thermal conductivity is greater than that of the remaining housing wall part 48. In a preferred embodiment, the at least one heat sink 44 is made of a metallic material and / or metallic alloy and vorzugwei se designed as an extruded part. The at least one heat sink 44 can be made of aluminum or copper, for example, or at least contain it. In another exemplary embodiment, the at least one heat sink 44 can be made of ceramic. The at least one heat sink 44 can be painted or anodized.

Such heat sinks are commercially available as standard heat sinks and can be used simply and inexpensively for the explosion-proof device 20 according to the invention. Measures to increase the mechanical strength or stability of the at least one heat sink 44 are not necessary.

In one embodiment, the cooling fins 45 are aligned essentially vertically such that the spaces between two immediately adjacent cooling fins 45 form a channel open vertically upwards and downwards (FIGS. 9-12). As a result, the natural convection with rising warm gas or warm air can ensure a good flow through the spaces between the cooling ribs. pen 45 can be used. In exemplary embodiments in which at least one heat sink 44 is fastened, for example, to the upper outer wall 25 or the lower outer wall 26, the cooling fins 45 can also have a different orientation (compare, for example, FIG. 8).

In addition to the basic illustration in FIG. 1, the at least one heat sink 44 can also have one or more cooling fins 45 which face the housing interior 22 (compare, for example, FIGS. 2, 9, 11 and 12).

As a modification of the illustrated exemplary embodiments, the cooling fins 45 do not have to run essentially in a straight line and parallel to one another, but can also be angled and / or curved. In addition or alternatively, it is also possible for one or more cooling fins 45 to have a T-shaped or a Y-shaped cross section.

At least one attachment surface 51 for the at least one electrical and / or electronic device 24 is present within the housing interior 22. As is shown by way of example in FIGS. 1-3, the at least one heat sink 44 can have the at least one attachment surface 51. The electrical and / or electronic device 24 can be arranged directly and in particular without a gas or air gap on the mounting surface 51 in order to produce the most flat and good thermal contact. The heat generated by the relevant electrical and / or electronic device 24 can therefore be conductively introduced into the relevant heat sink by 44 and can be conducted by the latter into the environment 23. The direct heat coupling between the at least one electrical and / or electronic device 24 and the relevant attachment surface 51 on the heat sink 44 is illustrated by way of example in FIG. 1.

In FIGS. 2 and 3, alternative exemplary embodiments are shown schematically. In the exemplary embodiment shown in FIG. 2, an intermediate layer 52 is present between the at least one electrical and / or electronic device 24 and the attachment surface 51. This intermediate layer 52 is used to produce egg ner good thermal connection and can be formed by a thermal paste or a thermal pad.

In the modified embodiment shown in Figure 3, the mounting surface 51 is not immediately on the at least one heat sink 44, but on a separate in the housing interior 22 arranged mounting wall 53 or mounting plate. The mounting wall 53 or mounting plate is thermally connected to the at least one heat sink 44. This heat-conducting connection can be followed by direct flat heat-conducting contact and / or by means of an intermediate layer 52, as is shown by way of example in FIG.

In Figure 3, a further embodiment is also illustrated with one or more additional heat sinks 54, which can be arranged in the housing interior 22 and can for example be directly conductively connected to an electrical and / or electronic device 24. Such additional heat sinks 54 can be present in all exemplary embodiments.

In all embodiments, the at least one heat sink 44 completely mounts the associated housing wall 25 to 29 and is therefore accessible both from the housing interior 22 and from the surroundings 23. As a result, a very effective heat-conducting connection between the housing interior 22 and the environment 23 can be produced independently of a gas or air flow.

The formation of one or more outer walls 25-29 with a heat sink wall part 47, which is formed by a respective heat sink 44, affects the structural integrity of the housing 21. This is particularly the case when the heat sink 44 or heat sink wall section 47 standard heat sink without mechanical reinforcement, for example extruded sections. In order to limit the explosion pressure prevailing in the event of a possible explosion in the housing interior 22, a pressure relief arrangement 32 is therefore in accordance with the invention which, in the event of an explosion, ensures a sufficiently large volume flow of a gas flow from the housing interior 22 into the surroundings 23.

Optionally, the cooling device 43 can have a blower 55 which can be arranged in the housing interior 22 in order to improve the cooling.

[0056] The pressure relief arrangement 32 has at least one gas-permeable, pressure-resistant pressure relief body 34 arranged in at least one pressure relief opening 33 of the housing 21. The at least one pressure relief body 34 is arranged in or on the assigned pressure relief opening 33 of an outer wall 25-29, so that an ignition-proof gas flow path through the at least one pressure relief opening 33 and the at least one pressure relief body 34 between the housing interior 22 and the environment 23 Herge is. Each pressure relief opening 33 completely penetrates an outer wall 25-29. As can be seen in FIG. 1, a plurality of pressure relief openings 33 can be arranged in a single outer wall (for example lateral outer wall 29) or in a plurality of outer walls 25-29. At least one pressure relief body 34 is arranged in or on each existing pressure relief opening 33, in order to produce the ignition resistance against impact of the gas flow path. Several pressure relief openings 33 can be covered by a common pressure relief body 34 or can be designed to be flame-proof.

In the example shown in FIG. 1, several pressure relief openings 33 are arranged, each with at least one pressure relief body 34, in each of the two lateral outer walls 29. In a modification of this, the at least pressure relief opening 33, each with at least one pressure relief body 34, can also be present in or on any of the other outer walls 25-29. Whether and in which of the outer walls 25-29 one or more pressure relief openings 33 or pressure relief bodies 34 are arranged can be determined depending on the application, in order to optimize the gas flow along the gas flow path to limit the explosion pressure. The gas flow along the gas flow path, which together through the entire pressure relief arrangement 32, is schematically illustrated in Figure 1 by the dashed arrows.

The at least one pressure relief body 34 can be directly or indirectly non-positively and / or positively and / or materially or by an adhesive Connection in and / or on the respective pressure relief opening 33 or a region surrounding the respective pressure relief opening 33 of the relevant outer wall 25-29 be connected. It can be connected, for example, by a screw connection and / or by gluing and / or by welding and / or the like to the relevant outer wall 25-29.

The at least one pressure relief body 34 is formed, for example, by a porous and / or mesh material structure which enables gas exchange through the material structure and on the other hand extinguishes or prevents flames, sparks and hot gases into the environment 23 to get. The material structure thus ensures the ignition safety of the gas flow path and at the same time allows a gas flow along the gas flow path with a high volume flow, among other things for convection cooling. The thickness of the at least one pressure relief body 34 in the gas flow direction is, for example, at least 5 mm or at least 10 mm. In the embodiment described here, for example, each pressure relief body 34 has an inner side 34a which is directly adjacent to the housing interior 22 and an outer side 34b which is directly adjacent to the surroundings. The thickness of the pressure relief body 34 is measured along the shortest path between the inside 34a and the outside 34b.

Preferably, the pressure relief body 34 is made of a material whose temperature resistance is at least 400 ° C. For example, the pressure relief body 34 can be made of chrome-alloy steel, such as stainless steel. The pressure relief body 34 can have a tangled fiber structure and / or a lattice structure and / or another porous structure or mesh structure. In the example schematically illustrated in FIG. 6, a porous body 36 has, for example, intertwined, disordered fibers to form a tangled fiber structure of the porous body 36. The fibers can have a diameter of 70 gm to 130 gm. The porous body 36 can be formed in a modification of porous sintered material and / or porous foam material or the like. The pore size of the porous body 36 is at least 80 pm and at most 250 pm. The porosity of the porous body 36 in the exemplary embodiment is in the range from 60% to 80%.

Another possibility of a material structure for use as a pressure relief body 34 is illustrated schematically in FIG. 7. A lattice body 37 is shown there, which has a plurality of lattice layers 38 which are arranged one above the other or stacked, so to speak. The individual grid layers 38 can be non-positively and / or positively and / or cohesively or bonded together by means of adhesion. As a result, a total of a lattice body 37 with an effective mesh size can be reached, which has at least 80 pm and a maximum of 250 pm. The lattice bars of the individual lattice layers 38 can be offset and / or aligned at an angle to one another in order to achieve the effective mesh size of the lattice body 37. The number of individual git layers 38 can vary depending on the configuration of each individual lattice layer 38 in order to achieve the desired effective mesh size of the lattice body 37 and the thickness specified above. To form a pressure relief body 34, a porous body 26 and / or a grid body 37 can be used. FIGS. 6 and 7 illustrate cylindrical configurations of the bodies 36, 37, which is only an example for explaining the respective structure. The outer contour depends on the desired outer contour of the pressure relief body 34 to be produced. The at least one pressure relief body 34 can be cylindrical, prismatic, cuboid, plate-shaped or in any other contour.

FIGS. 4 and 5 show an exemplary embodiment of an outer wall with a pressure relief body 31, in which almost an entire outer wall - and for example a lateral outer wall 29 - is formed by the pressure relief body 34. The pressure relief body 34 is arranged in this embodiment between two openings 39 holding elements. The two holding elements 39 take the Druckentlastungskör by 34 sandwiched between them. The holding elements 39 are designed, for example, in a grid-like manner.

Cooling device 43 FIGS. 8-12 show different configurations of the device 20, each with an explosion-proof housing 21. The area of an outer wall 25-29 with at least one pressure relief opening 33 and at least one pressure relief body 34 is schematically illustrated with cross hatching and can be designed analogously to the embodiment shown in FIGS. 4 and 5. Alternatively, a single pressure relief body 34 without holding elements 39 can be present in a pressure relief opening 33 in this area, for example in the area of its outer contour with the surrounding outer wall 25-29 is connected, in particular cohesively or by hat determination.

In the exemplary embodiments according to FIGS. 8-12, the front outer wall 28 is designed as a pivotable door 59. Alternatively, a pivotable door 59 can be arranged in the front outer wall 28. The door 59 is preferably pivotable about a substantially vertical pivot axis between an open position (Fig. 9-12) and a closed position (Fig. 8).

In the exemplary embodiment shown in FIG. 8, part of the upper outer wall 25 is designed as a heat sink wall part 47 by means of a heat sink 44. In the two lateral outer walls 29 there is at least one pressure relief opening 33 with at least one pressure relief body 34.

In all of the exemplary embodiments according to FIGS. 8-12, either at least one pressure relief opening 33 with at least one pressure relief body 34 or a heat sink 44 is present on or in one of the outer walls 25-29. A combination of both we at least one pressure relief opening 33 with at least one pressure relief body 34 and a heat sink 44 on or in a common outer wall 25-29 is not provided in the game, but could also be realized in embodiments not shown.

In the embodiment shown in Figure 9, a heat sink 44 is mounted in the door 59. It is also possible to form the entire door 59 by means of a heat sink 44. the. Cooling fins 45 are provided on the side facing the housing interior. As is illustrated in FIGS. 10 and 11, cooling fins 45 adjacent to the surroundings 23 may additionally or alternatively also be present.

The arrangement of the at least one heat sink 44 can take place in the exemplary embodiments according to FIGS. 8-12, as was explained above in connection with FIGS. 1 to 4.

In all of the exemplary embodiments, a flow channel 56 can be formed adjacent to the outer wall 25-29, in or on which at least one pressure relief body 34 is present. At least one of the existing pressure relief openings 33 with the at least one pressure relief body 34 borders on each flow channel 56. The respective outer sides 34b of the pressure relief body 34 are assigned to the flow channel 56, so that gas or

Air can flow from the housing interior 22 along the gas flow path through the at least one pressure relief body 34 and further along the flow channel 56. The flow channel 55 is delimited transversely to its direction of extension by a corresponding guide device 57 and at least partially by the adjacent outer wall 25-29 or the at least one outer side 34b of the at least one pressure relief body 34. The flow channel 56 is ge along its extent at opposite ends opens. The flow channel 56 preferably runs essentially vertically, so that warm air or warm gas can flow in the flow channel 56 from bottom to top due to the natural convection. When the flow channel 56 is aligned substantially vertically, it can be counteracted at its upper open end by means of a cover 58 the ingress of dust and / or water must be protected (Figure 5).

The invention relates to an explosion-protected device 20 with an explosion-protected housing 21 and a cooling device 43. The explosion-protected housing 21 has a plurality of outer walls 25-29 which enclose a housing interior 22 in an explosion-protected manner with respect to an environment 23. A pressure relief arrangement 32 Kühleinrich device 43 has at least one pressure relief opening 33 with at least one gas-permeable, ignition-proof pressure relief body 34. The at least one pressure relief opening 33 passes through at least one of the outer walls 25-29. Thus, a flameproof gas flow path between the housing interior 22 and the surrounding area 23 is formed. The cooling device 43 also has at least one heat sink 44, which forms at least one heat sink wall part 47 of one of the outer walls 25, 26, 27, 28, 29 and as the heat sink wall part 47 of this outer wall 25, 26, 27, 28, 29 outside to the environment 23 and inside on the adjacent to the housing interior 22 immediately adjacent. Because of the explosion pressure limitation by the pressure relief arrangement 32, a standard heat sink can be used to form the heat sink wall part 47, which is formed, for example, by an extruded profile part. Reference character list:

20 explosion-proof device

21 explosion-proof housing

22 housing interior

23 environment

24 electrical and / or electronic equipment

25 upper outer wall

26 lower outer wall

27 rear outer wall

28 front outer wall

29 outer side wall

32 Pressure relief arrangement

33 Pressure relief opening

34 pressure relief body

35 blowers

36 porous body

37 grid body

38 grid position

39 holding element

43 cooling device

44 heat sink

45 cooling fin

46 wall recess

47 Heat sink wall part

48 housing wall part

51 mounting surface

52 intermediate layer

53 mounting wall Additional heat sink fan

Flow channel guide device cover

door

Claims

Claims:

1. Explosion-proof device (20), comprising: an explosion-proof housing (21) which has a plurality of outer walls (25, 26, 27, 28, 29) which surround a housing interior (22) and are explosion-protected from an explosive atmosphere in separate a surrounding (23), a pressure relief arrangement (32) with at least one gas-permeable, ignition-proof pressure relief body (34), which is arranged in and / or at least one pressure-relief opening (33) of the housing (21), in order to ensure an ignition-proof To form gas flow path between the housing interior (22) and the environment (23), a cooling device (43) with at least one heat sink (44), the at least one heat sink wall part (47) of one of the outer walls (25, 26, 27, 28, 29) and which forms at least one heat sink wall part (47) of this outer wall (25, 26, 27, 28, 29) on the outside to the environment (23) and on the inside adjacent to the housing interior (22) immediately adjacent.

2. Explosion-proof device according to claim 1,

characterized in that the at least one cooling body (44) is inserted into a respectively assigned wall recess (46) of one of the outer walls (25, 26, 27, 28, 29), the wall recess (51) the outer wall (25, 26 , 27, 28, 29) fully penetrated.

3. Explosion-proof device according to claim 1 or

2,

characterized in that the at least one heat sink (44) is at least also connected to one or more of the outer walls (25, 26, 27, 28, 29) by an adhesive connection.

4. Explosion-proof device according to claim 1 or

2,

characterized in that the at least one cooling body (44) has cooling fins (45) arranged in the housing interior (22) and / or cooling fins (45) arranged in the surroundings (23).

5. Explosion-proof device according to one of the preceding claims,

characterized in that the at least one heat sink (44) is an extruded part.

6. Explosion-proof device according to one of the preceding claims,

characterized in that the at least one gas-permeable, ignition-proof pressure relief body (34) has an inside (34a) facing the housing interior (22) and an outside (34b) facing the surroundings (23).

7. Explosion-proof device according to one of the preceding claims,

characterized in that at least one mounting surface (51) for an electrical and / or electronic device (24) to be cooled is provided in the housing interior (22).

8. Explosion-proof device according to claim 7, characterized in that the at least one cooling body (43, 44) has at least one of the at least one attachment surface (51).

9. Explosion-proof device according to claim 7 or

8th,

characterized in that there is at least one mounting wall (53) having at least one of the at least one mounting surface (51).

10. Explosion-proof device according to claim 9,

characterized in that the at least one heat sink (44) is connected in a heat-conducting manner to the at least one attachment wall (53).

11. Explosion-proof device according to one of the preceding claims,

characterized in that at least one pressure relief opening (33), each with egg nem pressure relief body (34), is present in two opposing outer walls (25, 26; 27, 28; 29).

12. Explosion-proof device according to one of the preceding claims,

characterized in that the outer wall (25, 26, 27, 28, 29), which has at least one heat sink (44), is formed without a pressure relief opening (33) and pressure relief body (34).

13. Explosion-proof device according to one of the preceding claims, characterized in that the cooling device (43) has at least one fan (55) which is arranged in the housing interior (22).

14. Explosion-proof device according to one of the preceding claims,

characterized in that the housing (21) is designed in the type of protection flameproof enclosure (Ex-d).