阅读说明：本技术 防爆组件 (Explosion-proof assembly ) 是由 C·赫尔马诺夫斯基 T·阿恩霍尔德 于 2019-08-07 设计创作，主要内容包括：本发明涉及一种防爆组件(10),其具有防爆的壳体(11),该壳体包围壳体内腔(13)且实施成防燃型耐压封壳。壳体内腔(13)被中间壁(15)划分成第一子腔(16)和第二子腔(17),这样使得这两个子腔(16,17)相对于彼此防爆且因此每个子腔(16,17)相应于防燃型耐压封壳。壳体(11)的外壁(12)的至少一个外壁区段(12a)防点燃击穿地且可透气地来实施并且使在第二子腔(17)与周围环境(14)之间的气体交换成为可能。在壳体内腔(13)中布置有制冷机(22),蒸发器(27)位于第一子腔(16)中而冷凝器(24)位于第二子腔(17)中。因此可将在第一子腔(16)中至少一个电气的和/或电子的设备(21)或其他热源的热量导出到第二子腔(17)中且从那里导出到周围环境(14)中。通过这些措施可防止局部形成热点,其可点燃在周围环境(14)中易爆的大气。(The invention relates to an explosion-proof assembly (10) having an explosion-proof housing (11) which surrounds a housing interior (13) and is designed as a flame-proof pressure-tight enclosure. The housing interior (13) is divided by an intermediate wall (15) into a first subcavity (16) and a second subcavity (17) in such a way that the two subcavities (16,17) are explosion-proof relative to each other and thus each subcavity (16,17) corresponds to a pressure-resistant enclosure of the flame-proof type. At least one outer wall section (12a) of the outer wall (12) of the housing (11) is designed to be ignition-resistant and gas-permeable and to enable gas exchange between the second partial chamber (17) and the surroundings (14). A refrigerator (22) is arranged in the housing interior (13), an evaporator (27) is located in the first partial chamber (16) and a condenser (24) is located in the second partial chamber (17). The heat of at least one electrical and/or electronic device (21) or other heat source in the first partial chamber (16) can thus be conducted away into the second partial chamber (17) and from there into the surroundings (14). By means of these measures, local formation of hot spots, which can ignite an explosive atmosphere in the surroundings (14), can be prevented.)

1. An explosion-proof assembly (10) having:

-an explosion-proof housing (11) embodied as a flame-proof pressure-resistant enclosure (Ex-d), wherein the housing (11) encloses a housing interior (13) which is divided into a first subcavity (16) and a second subcavity (17) by an intermediate wall (15), wherein the intermediate wall (15) forms a barrier against ignition breakdown between the two subcavities (16,17), and wherein at least one gas-permeable outer wall section (12a) of the housing (11) adjoining the second subcavity (17) is set up to enable a gas exchange against ignition breakdown with an explosive atmosphere in the surroundings (14) of the housing (11),

-at least one device (21) being a potential ignition source, arranged in the first sub-chamber (16), which in its operation emits heat into the first sub-chamber (16),

-a refrigerator (22) having an evaporator (27) arranged in the first sub-chamber (16) and a condenser (24) arranged in the second sub-chamber (17).

2. Explosion-proof assembly according to claim 1, characterized in that the housing (11) has an outer wall section (12) adjoining the first subcavity (16), which hermetically closes the first subcavity (16) towards the ambient environment (14).

3. An explosion-proof assembly according to claim 1 or 2, characterized in that an intermediate wall (15) of the housing (11) hermetically closes the first subcavity (16) with respect to the second subcavity (17).

4. Explosion-proof assembly according to claim 1 or 2, characterized in that the intermediate wall (15) of the housing (11) is set up to enable a gas exchange between the two subcavities (16,17) which is resistant to ignition breakdown.

5. Explosion-proof assembly according to any one of the preceding claims, characterized in that the refrigerating machine (22) has a compressor (23) which is arranged in the first subcavity (16).

6. Explosion-proof assembly according to any one of the preceding claims, characterized in that the refrigerating machine (22) has an expansion device (26) which is arranged in the first subcavity (16).

7. Explosion-proof assembly according to any one of the preceding claims, characterized in that at least one blower (32) is arranged in the first subcavity (16) and/or the second subcavity (17).

8. Explosion-proof assembly according to one of the preceding claims, characterized in that a gas-permeable outer wall section (12a) of the housing (11) adjoining the second subcavity (17) is covered by a protective cover (40) arranged externally at the housing (11).

9. Explosion protection assembly according to claim 8, characterized in that the protective cover (40) has at least one opening (41), wherein the at least one opening (41) is not located directly opposite the gas-permeable outer wall section (12 a).

10. Explosion-proof assembly according to any one of the preceding claims, characterized in that the internal volume of the first sub-chamber (16) is greater than the internal volume of the second sub-chamber (17).

11. Explosion-proof assembly according to any one of the preceding claims, characterized in that there is a control device (31) for controlling the refrigerator (22) in order to control or regulate the temperature in the first sub-chamber (16) and/or the second sub-chamber (17).

Technical Field

The invention relates to an explosion-proof assembly having an explosion-proof housing and a refrigerator (Kaeltemaschine) for cooling the housing interior.

Background

Document DE 3203799 AI discloses an explosion-proof refrigerator. Where the explosive components are mounted in a gas-tight housing so that they cannot ignite the explosive atmosphere (Atmosph ä re) outside the housing. The evaporator of the refrigerator is located in the inner cavity of the refrigerator to be cooled, and the condenser is arranged outside the cooling chamber.

The explosion-proof housing is designed to enclose an ignition source and to prevent ignition of an explosion-prone atmosphere in the surroundings of the housing. The ignition source may be, for example, a device with electrical and/or electronic components. When enclosing such a device in a housing, it is necessary to ensure that heat generated during operation of the device is conducted away from the housing interior. Nor does it allow the entire assembly to have a temperature at any point that would cause ignition of an explosive atmosphere.

Disclosure of Invention

It may thus be seen as an object of the present invention to provide an explosion-proof assembly which guarantees high safety with a simple structure.

This object is achieved by an explosion-proof assembly with the features of claim 1.

The explosion-proof assembly according to the invention has an explosion-proof housing which is embodied as a flame-proof (Zuendshuttgart) pressure-resistant capsule (Ex-d). The housing has a plurality of housing outer walls that surround the housing interior. The housing inner cavity is surrounded by the outer wall of the housing with respect to the surrounding environment to form a pressure-tight enclosure.

The explosion-proof housing furthermore has an intermediate wall in the housing interior, which divides the housing interior into a first partial chamber (teirraum) and a second partial chamber. Gas exchange may take place between the second subchamber and the ambient. At least one outer wall section adjoining the second partial chamber is designed to be gas-permeable and is set up to make possible a flame-resistant (zunddurchschlagscher) gas exchange with an explosive atmosphere in the surroundings. For this purpose, the gas-permeable outer wall section itself can be made of a gas-permeable, ignition-flashover-proof material or have a gas-permeable, ignition-flashover-proof passage (Durchgangskanal).

The explosion-proof housing does not necessarily have to be the only housing. The two sub-chambers may also be formed by two initially separate housing members which engage each other. For example, the housing part with the second partial chamber can be flanged to the housing part with the first partial chamber.

The explosion-proof assembly furthermore has at least one electrical and/or electronic device which is arranged in the first partial chamber. In operation, the at least one device emits heat into the first subchamber. To conduct heat away from the first subchamber, the explosion-proof assembly has a refrigerator. The refrigerator has an evaporator disposed in the first sub-chamber and a condenser disposed in the second sub-chamber.

The intermediate wall forms a barrier between the two subcavities against ignition breakdown. The two partial chambers are each embodied as a flame-proof pressure-resistant capsule (Ex-d). This means that ignition within the first sub-chamber does not result in ignition or explosion in the second sub-chamber and vice versa. Furthermore, it is achieved that the volume of the two partial chambers is smaller than the total housing interior and therefore the explosion pressure to which the housing has to withstand can be reduced in comparison with a housing with a single, coherent housing interior of the same dimensions.

By arranging the evaporator in the second subcavity it is ensured that the heat generated by the refrigerator cannot lead to ignition of the explosive atmosphere at the evaporator. By means of the refrigerating machine, it can be ensured that the heat generated by the one or more heat sources in the first partial chamber is absorbed and at least partially transferred into the second partial chamber. By arranging the flow channel of the refrigerator in the first sub-chamber, not only can the gas temperature in the interior of the first sub-chamber be influenced, but hot spots at the outer wall of the housing surrounding the first sub-chamber can also be avoided in a targeted manner. The temperature at the outer walls is not allowed to exceed a predetermined temperature threshold at any point in order to avoid ignition of the surrounding explosive atmosphere by the hot housing part.

The heat transferred in the second sub-chamber may be emitted by gas exchange with the surrounding environment. At the same time, the prevention of the high temperatures that may be present in the second partial chamber at the condenser can lead to the ignition of the surrounding atmosphere, since the second partial chamber is also pressure-tightly sealed with respect to the surroundings.

It is advantageous when the housing has an outer wall section adjoining the first sub-chamber, which substantially hermetically closes the first sub-chamber towards the surroundings.

At least one door, at least one flap or at least one cover of the housing may enable access to the first sub-chamber and/or the second sub-chamber, so that a gap may exist between the first sub-chamber and the surroundings, which gap is resistant to ignition breakdown. No significant and in particular no intentional gas exchange takes place through such a gap which prevents a breakdown by ignition. The at least one door, the at least one flap or the at least one cover may be hermetically closable. The term "gas-tight" is to be understood here as meaning a design which does not allow any, or at least not purposefully induced, gas exchange between the housing interior and the surroundings.

It is furthermore advantageous when the intermediate wall of the housing closes the first partial chamber in a gas-tight manner relative to the second partial chamber. Whereby no purposely induced gas exchange takes place between the two subcavities.

In an alternative embodiment, the intermediate wall of the housing of the explosion-proof assembly is designed in such a way that a gas exchange between the two partial chambers is possible, which prevents ignition flashovers. The intermediate wall can be designed in the same way as the gas-permeable outer wall section of the outer wall of the housing adjoining the second partial chamber.

In order to establish breathability, parts of the respective wall or the entire wall can be made of a porous material and/or a mesh-like material, for example. By means of such a construction, on the one hand, gas exchange is possible and, on the other hand, escape of flames, sparks, hot gases, etc. is avoided.

The gas-permeable, ignition-resistant wall section can be produced, for example, from a non-oriented fiber structural component (wirfastrutherteil). In another embodiment one or more grating layers may be arranged on top of each other. The gas-permeable, ignition-resistant wall section has an average mesh or pore size in the range of approximately 80 [ mu ] m to 250 [ mu ] m. The thickness of the gas-permeable, ignition-breakdown-preventing wall section is at least 5mm or at least 10 mm. The ignition-resistant, gas-permeable wall section is preferably made of a material whose temperature resistance lies at least 400 ℃. The gas-permeable, ignition-resistant wall section can be made, for example, of a chromium alloy steel, for example, high-grade steel.

It is also advantageous if the refrigerating machine has a compressor which is arranged in the first partial chamber. The refrigerating machine furthermore has an expansion device, which is preferably arranged in the first partial chamber. Furthermore, at least one blower can be arranged in the first partial chamber and/or in the second partial chamber in order to cause air circulation. It is particularly advantageous to arrange the blower in the first partial chamber if the intermediate wall makes possible a gas exchange between the two partial chambers which is resistant to ignition flashovers.

A protective cover can be arranged on the outside of the housing, said protective cover being designed to cover the ignition-breakdown-resistant, gas-permeable outer wall section adjoining the second partial chamber, in particular to prevent the ingress of spray water into the second partial chamber through the gas-permeable outer wall section. It may be advantageous here if the protective cover has at least one opening for the purpose of gas exchange between the second subcavity and the surroundings. The at least one opening is preferably not arranged in a direct, straight line with respect to the gas-permeable outer wall section, in particular to achieve the desired spray water prevention.

Preferably, the internal volume of the first sub-chamber is greater than the internal volume of the second sub-chamber.

In one embodiment, the explosion-proof assembly has a control device for controlling the refrigerator. The control device is designed to control or regulate the temperature in the first partial chamber and/or in the second partial chamber in connection with the refrigerating machine. Additionally or alternatively, the control device may also control at least one blower, which may be arranged in the first sub-chamber and/or in the second sub-chamber. It is advantageous here if at least one temperature sensor is present at least in one of the partial chambers for determining the temperature in the respective partial chamber and/or at an outer wall region of the housing surrounding the respective partial chamber.

Drawings

Advantageous embodiments of the invention result from the dependent claims, the description and the drawings. Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Wherein:

figure 1 shows a schematic block diagram-like representation of an embodiment of an explosion-proof assembly with an explosion-proof housing and a refrigerating machine,

figures 2 and 3 show an embodiment of a variant of the explosion-proof assembly of figure 1 and

fig. 4 and 5 show schematic perspective views of gas-permeable, ignition-breakdown-resistant structures, respectively, as they may be used for walls or wall sections in any embodiment of an explosion-proof assembly.

Detailed Description

In fig. 1, an exemplary embodiment of an explosion-proof assembly 10 is schematically illustrated, which has an explosion-proof housing 11. The explosion-proof housing 11 has a plurality of, preferably six, outer walls 12, of which only four are shown in a schematic sectional view in fig. 1. The housing 11 has, for example, a generally square configuration. The housing 11 can also have other shapes, for example cylindrical, prismatic or other free shapes with a plane and/or curved outer wall 12. The outer wall 12 surrounds the housing interior 13 and separates it from the environment 14 surrounding the housing 11 with an explosive atmosphere in a manner that prevents ignition breakdown. The casing 11 is constructed as a flame-proof pressure-resistant enclosure (Ex-d) according to one of the standards EN60079-1 or IEC 60079-1.

The housing interior 13 is divided by an intermediate wall 15 of the housing 11 into a first subchamber 16 and a second subchamber 17. The intermediate wall 15 is configured such that it separates the first partial chamber from the second partial chamber 17 in a manner that prevents ignition flashover. The intermediate wall thus forms a barrier between the two partial chambers 16,17 against ignition breakdown. The two partial chambers 16,17 are each designed in a manner explosion-proof on their own as a flame-proof pressure-proof enclosure (Ex-d).

Belonging to the explosion-proof assembly 10 is at least one device, which may be an ignition source for an explosive atmosphere in the ambient environment 14, illustratively at least one electrical and/or electronic device 21, which is arranged in the first subcavity 16 of the housing 11 or of the housing interior 13. The at least one electrical and/or electronic device 21 is arranged explosion-proof in the first partial chamber 16 of the housing 11. Possible electrical connections or wires from the surroundings 14 into the first subcavity 16 are guided through the outer wall 12 in an explosion-proof manner, as is known per se in the field of explosion protection. Such wires or connections can be hermetically sealed with the outer wall 12 by casting (Verguss) or otherwise guided explosion-proof through the outer wall 12 into the first subchamber 16 with the formation of a gap which prevents ignition flashover.

The at least one electrical and/or electronic device 21 generates heat during operation. This heat is emitted into the first sub-chamber 16 and heats the outer wall 12 surrounding the first sub-chamber 16. Furthermore, the operation of the at least one device 21 increases the temperature of the atmosphere in the first partial chamber 16, which may also be undesirable for the operation of the at least one electrical and/or electronic device 21. To effectively conduct heat away from first subchamber 16, explosion-proof assembly 10 has a refrigerator 22. The chiller 22 provides a closed fluid cycle of refrigerant that assumes different states of aggregation within the fluid cycle. The refrigerant is compressed by a compressor 23 of the refrigerator 22 and condensed and thus liquefied in a heat carrier or condenser 24 coupled to the compressor 23. Heat is generated when the refrigerant liquefies. A condenser 24 is arranged in the second sub-chamber 17.

In the exemplary embodiment, condenser 24 is formed by a condenser coil 25, which is arranged in a serpentine or zigzag manner in second partial chamber 17. The condenser coil 25 is guided in a flashover-proof manner through the intermediate wall 15 and is fluidly connected at one end to the compressor 23 and, conversely, at the opposite end to the expansion device 26 of the refrigerating machine 22.

The expansion device 26 may have, for example, an expansion valve and/or a capillary tube. The expansion device 26 reduces the pressure of the refrigerant and directs the refrigerant downstream of the expansion device 26 to a heat carrier or evaporator 27. The refrigerant absorbs heat in the evaporator 27 and evaporates at a relatively low temperature. This process is also known as evaporative cooling (Siedekuehlung). The refrigerant in the evaporator 27 is then fed to the compressor 23 and in this way a closed fluid circuit of the refrigerating machine 22 is realized.

An evaporator 27 is arranged in the first subcavity 16 to absorb heat emitted there by the at least one electrical and/or electronic device 21. In an embodiment a compressor 23 and an expansion device 26 are also arranged in the first sub-chamber 16. The modular component or assembly can thus be used in a refrigerator. All components of refrigerator 22 are arranged explosion-proof in first subchamber 16 or in second subchamber 17.

The evaporator 27, which is formed by a serpentine or meander-like evaporator coil, like the condenser 25, can be laid in the first partial chamber 16 in such a way that the heat emission of the at least one electrical and/or electronic device 21 and the absorption by the refrigerant are optimized, in particular, in such a way that a section of the evaporator coil 28 is realized spatially close to the at least one electrical and/or electronic device 21. Additionally or alternatively, a section of the at least one evaporator coil 28 may be laid at least along the one or more outer walls 12 (or at least a section thereof) adjacent to the first subcavity 16. Too strong local heating of the associated outer wall 12 can thereby be avoided.

For measuring at least one temperature, at least one temperature sensor 30 can be arranged in the first partial chamber 16 and/or in the second partial chamber 17, which in each case generates a respective temperature signal T1-T4 and is set up to transmit the respective temperature signal T1-T4 to the control device 31. In the exemplary embodiment, three temperature sensors 30 are arranged in the first partial chamber 16, which generate a first temperature signal T1, a second temperature signal T2 and a third temperature signal T3 and transmit them to the control device 31. In the second partial chamber 17, a further temperature sensor 30 is arranged by way of example, which generates a fourth temperature signal T4 and transmits it to the control device 31. The control device 31 can evaluate the temperature signals T1-T4 and, as a function thereof, operate the refrigerator 22, for example the compressor 23, via the first control signal S1.

In the exemplary embodiment shown in fig. 1, shown in dashed lines, at least one blower can be arranged in each case in the first partial chamber 16 and/or in the second partial chamber 17 in order to cause air circulation. For each blower 32 present, the control device 31 may generate an associated control signal, for example a second control signal S2 for the blower 32 in the first subcavity 16 and a third control signal S3 for the blower 32 arranged in the second subcavity 17.

As schematically represented in fig. 1 to 3, at least one outer wall section of the outer wall 12 adjoining the second subcavity 17 is configured as a gas-permeable outer wall section 12 a. In the exemplary embodiment shown in fig. 1, one of the outer walls 12 adjoining the second partial chamber 17 is embodied completely as a gas-permeable outer wall, so that the gas-permeable outer wall section 12a forms the entire outer wall 12. The gas-permeable outer wall section 12a is designed to be resistant to ignition flashover, so that the second partial chamber 17 is explosion-proof with respect to the surroundings 14 and meets the requirements of a pressure-resistant enclosure (Ex-d) as an example.

Fig. 4 and 5 show very schematically a corresponding material structure which is suitable for increasing the gas exchange in the event of a flashover protection. For example, the gas-permeable outer wall section 12a can be formed by a porous material 35, which is made of, for example, an unoriented fibrous structure material. The porous material 35 has fibers which are interlaced and arranged irregularly and which can have a diameter of approximately 70 μm to 130 μm. The pore size of the porous material 35 may have a minimum of 80 μm and a maximum of 250 μm. The porosity of the porous material 35 is preferably in the range of 60% to 80%.

Additionally or alternatively, the gas permeable outer wall section 12a may be formed of a mesh or grid material 36 (fig. 5). The mesh size is approximately a minimum of 80 μm and a maximum of 250 μm. A plurality of layers 37 with different grid structures or grid strip orientations can be arranged on top of one another in order to enable, on the one hand, gas to flow through the grid material 36 and, on the other hand, to extinguish flames, sparks and hot gases.

A combination of porous material 35 and grid material 36 is also possible to form a ignition-breakdown-resistant, gas-permeable outer wall section 12 a.

Gas exchange between the second partial chamber 17 and the surroundings 14 is possible via the at least one ignition-breakdown-resistant, gas-permeable outer wall section 12 a. The heat emitted from the condenser 24 into the second partial chamber 17 can thus be dissipated to the outside into the surroundings 14. As already explained, a blower 32 can be arranged in the second partial chamber 17 for this purpose in order to improve the gas exchange between the second partial chamber 17 and the surroundings 14.

As shown in fig. 1 and 2, the intermediate wall 15 can also have at least one gas-permeable intermediate wall section 15a which is designed to be protected against ignition flashover. The ignition flashover-resistant, gas-permeable intermediate wall section 15a can be constructed similarly to the gas-permeable outer wall section 12a and for this purpose, for example, has a porous material 35 and/or a grid material 36, which on the one hand enables gas exchange between the first subcavity 16 and the second subcavity 17 and on the other hand nevertheless maintains an ignition flashover-resistant between the first subcavity 16 and the second subcavity 17.

In the exemplary embodiment shown in fig. 1, intermediate wall 15 is completely ignition-resistant and gas-permeable, like outer wall 12 adjoining second partial chamber 17. In a variant hereof, intermediate wall 15 and/or outer wall 12 may also be only partially gas-permeable and have, for example, inserts to form gas-permeable outer wall sections 12a and/or gas-permeable intermediate wall sections 15a, as schematically shown in fig. 2.

In a further alternative embodiment, intermediate wall 15 may also be substantially gas-impermeable, so that no intentional and intentional gas exchange takes place between the two partial chambers 16,17 (fig. 3).

The embodiments according to fig. 1-3 can also be combined with each other. For example, in all exemplary embodiments the outer wall 12 adjoining the second partial chamber 17 in its entirety can be designed to be ignition-resistant and gas-permeable, as is shown in fig. 1. The intermediate wall 15 in the exemplary embodiment shown in fig. 3 can be designed corresponding to the exemplary embodiment according to fig. 1. Otherwise the embodiment according to fig. 1-3 is the same, so that reference is made to the above description of fig. 1. For clarity reasons, the temperature sensor 30 and the control device 31 are omitted in fig. 2 and 3.

In the embodiment shown in fig. 3 with a substantially gas-impermeable intermediate wall 15, there is exemplarily no blower 32 in the first subcavity 16. In this embodiment, at least one blower 32 in the second partial chamber 17 can be sufficient to support the circulation of air between the second partial chamber 17 and the surroundings 14. If the circulation of air within the first subcavity 16 is advantageous, depending on the design of the refrigerating machine 22 and in particular of the evaporator 27, there may also be at least one blower 32 in the first subcavity 16 in the embodiment according to fig. 3, in order to support the heat transfer to the evaporator 27 and/or an improved temperature distribution in the first subcavity 16 and at the outer wall 12 of the housing 11 adjoining the first subcavity 16.

The explosion-proof assembly 10 can furthermore optionally have a protective hood 40 which is designed to cover the at least one ignition-breakdown-resistant, gas-permeable outer wall section 12a and is arranged externally on the housing 11. The protective cover 40 covers the at least one gas-permeable outer wall section 12a, in particular in order to protect it from spray water directed directly at the gas-permeable outer wall section 12 a. Protective cover 40 has at least one and preferably a plurality of openings 41 to enable gas exchange between second subchamber 17 and ambient 14. The at least one opening 41 is arranged such that it does not face the gas-permeable outer wall section 12a in a straight direction.

Efficient heat removal from the first sub-chamber 16 into the second sub-chamber 17 by heat emitted by the at least one electrical and/or electronic device 21 is provided by the explosion proof assembly 10. Where air circulation with the surroundings 14 is effected in order to emit hot air outwards and to absorb cooler air from the surroundings 14. A very uniform heat distribution is achieved overall. Hot spots at the outer wall 12 of the housing 11 (which may serve as an ignition source for an explosive atmosphere in the surrounding environment 14) are thereby avoided. In order to control or regulate the refrigerating machine 22, the temperature at one or more points can be detected, in particular also at least one temperature of the outer wall 12 of the housing 11, in particular at points where there is a risk that the relevant outer wall 12 of the housing 11 heats up very strongly and can be used as an ignition source.

The invention relates to an explosion-proof assembly 10 having an explosion-proof housing 11 which surrounds a housing interior 12 and which is designed as a flame-proof pressure-tight enclosure. The housing interior 13 is divided by an intermediate wall 15 into a first partial chamber 16 and a second partial chamber 17 in such a way that the two partial chambers 16,17 are explosion-proof relative to one another and therefore each partial chamber 16,17 conforms to a pressure-resistant capsule of the flame-proof type. At least one outer wall section 12a of the outer wall 12 of the housing 11 is ignition-resistant and gas-permeable and makes possible a gas exchange between the second partial chamber 17 and the surroundings 14. A refrigerator 22 is disposed in the housing interior 13, with an evaporator 27 located in the first subchamber 16 and a condenser 24 located in the second subchamber 17. Heat from at least one electrical and/or electronic device 21 or other heat source in first sub-chamber 16 can thus be conducted out into second sub-chamber 17 and from there into ambient environment 14. This measure very effectively prevents the formation of local hot spots that could ignite an explosive atmosphere in the surrounding environment 14.

List of reference numerals

10 explosion-proof assembly

11 casing

12 outer wall

12a gas-permeable outer wall section

13 casing inner cavity

14 surroundings

15 intermediate wall

15a gas-permeable intermediate wall section

16 first subchamber

17 second subchamber

21 electric and/or electronic device

22 refrigerator

23 compressor

24 condenser

25 condenser coil

26 expansion device

27 evaporator

28 evaporator coil

30 temperature sensor

31 control device

32 blower

35 porous material

36 grid material

37 layers of

40 protective cover

41 opening

S1 first control signal

S2 second control signal

S3 third control signal

T1 first temperature signal

T2 second temperature signal

T3 third temperature signal

T4 fourth temperature signal.