Control cabinet assembly with forced ventilation

Abstract

The invention relates to a control cabinet assembly (1) comprising at least one control cabinet housing (2) and a cooling device (3), wherein the cooling device (3) has a coolant circuit (4) with a flammable coolant, wherein the coolant circuit (4) has an evaporator (5), which is arranged in an air inner circuit (9) of the cooling device (3) and through which air inside the control cabinet housing (2) flows, characterised in that the control cabinet assembly (1) also has forced ventilation (6) of the control cabinet housing (2), which has an activated status when a leak is detected in the coolant circuit (4) and otherwise has a deactivated status, wherein, in the activated state, ambient air of the control cabinet assembly (1) is introduced into the control cabinet housing (2) and / or the air inside the control cabinet housing (2) is conveyed out of the control cabinet housing (2).

Description

[0001] CONTROL CABINET ARRANGEMENT WITH FORCED VENTILATION

[0002] The invention is based on a switch cabinet assembly comprising at least one switch cabinet housing and a cooling device, wherein the cooling device has a refrigerant circuit containing a flammable refrigerant. The refrigerant circuit has an evaporator arranged in an internal air circuit of the cooling device and through which air contained in the switch cabinet housing flows. Such a switch cabinet assembly is described in DE 10 2018 109 604 Ai.

[0003] Directive 2006 / 42 / EC (Machinery Directive) requires that gases used in machinery do not pose a risk of explosion or fire, although it is assumed that individual components will fail. Therefore, if a component containing a refrigerant in an enclosure cooling unit has a suspected leak, it can be assumed that flammable gas (refrigerant) will enter the enclosure and ignite on components that ignite arcs during operation. Without a safety function that reliably prevents this, enclosure cooling units that use flammable refrigerants cannot comply with the Machinery Directive or operate with the necessary safety for the end user.

[0004] The control cabinet arrangements known from the state of the art have the disadvantage that they are comparatively complex to implement, since, for example, various actively driven closing elements are required and must be activated in the event of a detected leak or when a flammable refrigerant enters the interior of the control cabinet.

[0005] It is therefore the object of the invention to further develop the switch cabinet arrangement described at the outset in such a way that it can be implemented using simple technical means and is accordingly inexpensive to provide.

[0006] This object is achieved by a switch cabinet assembly having the features of claim 1. Advantageous embodiments are each subject of the dependent claims. Accordingly, a switch cabinet assembly of the type described above is provided with forced ventilation of the switch cabinet housing, which has an activated state when a leak in the refrigerant circuit of the cooling device is detected and a deactivated state otherwise. In the activated state, ambient air of the switch cabinet assembly is to be conveyed into the switch cabinet housing and / or the air contained in the switch cabinet housing is to be conveyed out of the switch cabinet housing.

[0007] The refrigerant circuit can, for example, be a component of a refrigeration machine and / or a passive refrigerant circuit, for example, a refrigerant circuit in natural circulation, driven by a geodetic height difference, such as a heat pipe. Accordingly, the refrigerant circuit can be designed as an active refrigerant circuit or as a passive circuit. In principle, the invention is not limited to the application of specific methods for producing cold. In particular, all means relating to the forced ventilation according to the invention can be designed independently of the refrigerant circuit, and in particular, it is not necessary to monitor the refrigerant circuit itself in order to detect a leak.

[0008] The refrigerant circuit can have a condenser in an outer air circuit of the cooling device that is fluidically separated from the inner air circuit, wherein the condenser is flowed through by ambient air that is passed through the outer air circuit.

[0009] In the deactivated state, the forced ventilation can be fluidically sealed by an adjustable closing device. The interior of the control cabinet housing can be fluidically separated from the ambient air of the control cabinet housing. In particular, there should be no air exchange between the inner and outer air circuits.

[0010] The forced ventilation system can comprise at least one fan, which, when the forced ventilation system is activated, transports ambient air into the interior of the control cabinet housing. Alternatively, the fan can be configured to exhaust the air absorbed in the control cabinet housing into the environment. The forced ventilation system can comprise at least one air duct between the environment of the control cabinet housing and the interior of the control cabinet housing. The air duct can be closed by a closing element, preferably a check valve, when the forced ventilation system is deactivated. For this purpose, the check valve can be pre-tensioned into its closed position so that, when the fan is deactivated, there is no air volume flow opening the check valve.

[0011] The at least one air duct can be part of the cooling device or can be designed independently of the cooling device. If the air duct is part of the cooling device, at least one further air duct can also be part of the cooling device or part of the control cabinet housing. The two air ducts can accordingly be configured to provide air supply to the interior of the control cabinet housing and air discharge from the interior to the surroundings of the control cabinet housing. At least one of the air ducts can accordingly have a fan.

[0012] The cooling device can have two air ducts, at least one of which has a fan. At least one of the air ducts can have a closing element, preferably a check valve. The closing element can only be permeable in an air flow direction generated by the fan. The closing element can in particular be pretensioned into a closed position in which it closes the relevant air duct when the fan is deactivated. Accordingly, the closing element opens when the fan is activated. Thus, the closing element can be openable in the flow direction generated by the fan and close the air duct in the opposite direction. In the permeable direction, the closing element, for example a check valve, can open due to the dynamic pressure generated when the fan is activated.

[0013] The control cabinet arrangement can have at least one refrigerant sensor for detecting a flammable refrigerant in the air contained in the interior of the control cabinet housing. The refrigerant sensor can generally be arranged at any location within the control cabinet arrangement at which the sensor is exposed to the evaporating refrigerant in the interior of the control cabinet housing in the event of a leak in the refrigerant circuit. This can be on any side of the control cabinet housing facing the interior. Alternatively, the refrigerant sensor can also be arranged on an outside of the cooling device facing the interior. Furthermore, the refrigerant sensor can be arranged, for example, within the cooling device, for example in the internal air circuit of the cooling device.Furthermore, alternatively, the refrigerant sensor can be part of a filter fan of the switch cabinet assembly and can be arranged either on a side of the filter fan facing the interior or in an interior region of the filter fan that is exposed to the air taken in by the interior of the switch cabinet housing. In particular, for the purpose of redundancy, several of the aforementioned refrigerant sensors can be provided, with preferably at least two of the redundant refrigerant sensors being arranged at different mounting positions of the switch cabinet assembly.

[0014] The control cabinet arrangement may comprise at least one single-channel refrigerant sensor that is sensitive to at least one flammable refrigerant, for example R32, Ri234yf, ri234ze, propane, or butane.

[0015] If the control cabinet arrangement has at least two of the aforementioned refrigerant sensors, it can be provided that the at least two refrigerant sensors are sensitive to at least one identical flammable refrigerant and the two refrigerant sensors can be configured to output their respective sensor signal in a single channel, preferably via the same channel.

[0016] The at least one refrigerant sensor can be configured to forward the detection of a refrigerant in the air contained in the interior of the switch cabinet housing to a control and regulation unit for initiating a safety measure to reduce the concentration of the refrigerant in the air contained in the interior of the switch cabinet. The control and regulation unit can be arranged outside or inside the switch cabinet arrangement, for example, outside the switch cabinet housing and outside the cooling device, and can be connected to the at least one refrigerant sensor via a signal interface for signal transmission. The control and regulation unit can be configured to transfer the forced ventilation of the switch cabinet housing from the deactivated state to the activated state.The at least one refrigerant sensor can be configured to forward the detection of a refrigerant in the air contained in the interior of the switch cabinet housing to a control and regulation unit arranged in the cooling device. The cooling device can be configured to initiate a safety measure to reduce the concentration of the refrigerant in the air contained in the interior of the switch cabinet, preferably by switching the forced ventilation of the switch cabinet housing from the deactivated state to the activated state.

[0017] The at least one refrigerant sensor can be arranged in an air outlet flow of the internal air circuit from the cooling device into the interior of the switch cabinet housing or in an air inlet flow of the external air circuit from the surroundings of the switch cabinet housing into the cooling device.

[0018] The cooling device can have at least one additional fan, by which ambient air from the environment of the switch cabinet arrangement is sucked into a housing of the cooling device and blown into the interior of the switch cabinet housing.

[0019] The cooling device can be configured to be deactivated upon detection of a flammable refrigerant by the at least one refrigerant sensor, so that at least one compressor of the cooling device is deactivated. The switch cabinet arrangement can further comprise a safety device configured to prevent accidental restart of the compressor. The at least one fan can comprise a refrigerant sensor that is exposed to the air contained in the switch cabinet housing, wherein the at least one fan is configured to ventilate or de-ventilate the switch cabinet housing.

[0020] With at least one fan, the air taken in by the control cabinet housing can be blown out into the surroundings of the control cabinet housing and air can be blown into the control cabinet housing from the surroundings of the control cabinet housing.

[0021] The control cabinet arrangement can have at least one additional fan configured as an inlet or outlet filter fan. Preferably, the at least one fan and the at least one additional fan are configured as fans with opposite flow directions relative to the interior of the control cabinet housing.

[0022] The at least one fan can be arranged in an opening in a vertical or horizontal wall of the control cabinet housing and in particular can be designed separately from the cooling device.

[0023] The refrigerant sensor can be arranged either inside a housing of the at least one fan, on a circuit board of a fan controller, or on an exterior of the at least one fan, and connected to a fan controller via a wired or wireless connection. Alternatively, the refrigerant sensor can be mounted inside the control cabinet housing and connected to the fan controller via a wireless or wired signal interface.

[0024] The fan may have an alarm output configured to output an alarm signal when the fan is transitioned from the deactivated state to the activated state. The alarm signal provided via the alarm output can be used, for example, to cascade control at least one other fan.

[0025] The fan can have an alarm input configured to trigger forced ventilation upon receiving an alarm signal. The alarm input can be connected wirelessly or wired to an alarm output of another fan in the control cabinet arrangement for transmitting the alarm signal.

[0026] The forced ventilation can have an air duct in a base of the control cabinet housing, via which the interior of the control cabinet housing is fluidically connected to the environment of the control cabinet housing via the base of the control cabinet housing.

[0027] The air duct in the base can have at least one fan with which, when the forced ventilation is activated, ambient air is transported into the interior of the switch cabinet housing or the air absorbed in the interior of the switch cabinet housing is transported out of the interior into the environment. The base can be separated from the interior of the equipment cabinet housing by at least one base plate. For this purpose, the at least one base plate can be permeable to air at least in sections, for example perforated. The base plate can accordingly form a fluidic transition between the interior of the switch cabinet housing and the air duct in the base. Alternatively or additionally, at least two base plates can be solid, i.e. without openings, and arranged at a distance from one another, for example with an air-permeable cable duct formed between the base plates, which opens into the air duct in the base.

[0028] The fluidic transition can be a cutout in a floor panel, in which a fan is preferably, but not necessarily, mounted. The fan can either discharge the air absorbed in the interior of the control cabinet housing into the environment through the air duct or introduce ambient air into the interior of the control cabinet housing.

[0029] The air-permeable floor plate can be designed, at least in sections, as a cable duct through the floor plate and / or as an air-permeable fleece, for example a filter substrate.

[0030] A fan can be installed in a cutout in a flat part of the switch cabinet housing, which either blows ambient air into the interior of the switch cabinet housing or exhausts the air taken in into the interior to the environment of the switch cabinet arrangement. Pressure equalization can be provided via the air duct, whereby either ambient air is fed into the interior or the air taken in into the interior is exhausted to the environment.

[0031] The switch cabinet housing can have at least one air inlet or one air outlet, wherein the air inlet or air outlet is preferably formed as a cutout in at least one flat part. The flat part can be, for example, a side wall, a rear wall, a door element, or a roof element of the switch cabinet housing. In one embodiment, at least one fan is arranged in the cutout, wherein the switch cabinet housing or the base has at least one further air inlet or air outlet, preferably at least one further cutout.

[0032] At least one refrigerant sensor can be arranged for the detection of a flammable refrigerant in the base, for example in a housing of a forced ventilation fan and / or in the air duct, or on an upper side of the base facing the switch cabinet interior, for example on a base plate of the base, or above the base in the switch cabinet housing.

[0033] The switch cabinet assembly can further comprise at least one refrigerant sensor, which is arranged in the air duct or is exposed to the air conveyed through the air duct. The air absorbed in the interior of the switch cabinet housing can preferably be discharged via the air duct into the surroundings of the switch cabinet assembly.

[0034] The at least one refrigerant sensor can be part of the fan and exposed on a side of the fan housing facing the interior of the control cabinet housing. Alternatively or additionally, the refrigerant sensor or another refrigerant sensor can be arranged in the interior of the control cabinet housing and connected via a wired or wireless signal interface to a control and regulation unit for converting the forced ventilation from the deactivated state to the activated state. The control and regulation unit can be part of the fan or be designed independently of the fan.

[0035] The at least one fan can be arranged in a cutout in the roof of the switch cabinet housing, wherein the fan is configured to transport the air absorbed in the interior of the switch cabinet housing out of the switch cabinet housing. The switch cabinet housing can preferably have at least one air inlet in a lower region of the switch cabinet housing, preferably a cutout in a flat part of the switch cabinet housing.

[0036] Further details of the invention are explained with reference to the following figures. Figure 1 shows a schematic cross-sectional view of an exemplary embodiment of a switch cabinet arrangement according to the invention;

[0037] Figure 2 is a schematic representation of a further embodiment of a switch cabinet arrangement according to the invention;

[0038] Figure 3 is a schematic representation of yet another embodiment of a switch cabinet arrangement according to the invention;

[0039] Figure 4 is a schematic representation of yet another embodiment of a switch cabinet arrangement according to the invention;

[0040] Figure 5 is a schematic representation of yet another embodiment of a switch cabinet arrangement according to the invention;

[0041] Figure 6 is a schematic representation of yet another embodiment of a switch cabinet arrangement according to the invention;

[0042] Figure 7 shows a schematic representation of an exemplary embodiment of a filter fan;

[0043] Figure 8 shows yet another embodiment of a filter fan; and

[0044] Figure 9 shows yet another embodiment of a filter fan.

[0045] The embodiment of a switch cabinet arrangement i according to the invention shown in Figure 1 is characterized in that all means relating to the forced ventilation according to the invention are integrated into the cooling device 2, in particular a first and a second air duct 12, 13, each having a non-return valve 14, as well as a fan 10 integrated into the first air duct 12. Provision is made here for the forced ventilation 6 to be designed independently of both the internal air circuit 9 and the external air circuit 8 of the cooling device 3. In particular, there are no fluidic transitions between the forced ventilation 6, in particular the air ducts 12, 13, and the internal air circuit 9 and the external air circuit 8.

[0046] The refrigerant sensor 15, which is provided for detecting a leak due to the accumulation of a flammable refrigerant in the air contained in the interior 11 of the switch cabinet housing 2, is also arranged on an outer side of the cooling device 3 facing the interior 11, via which the cooling device 2 protrudes into the switch cabinet housing 2 through a vertical side wall or a rear wall or a door element, so that the inner air circuit 9 is fluidly connected to the air contained in the interior 11. The cooling device 3 has a refrigeration machine in the known manner, with an evaporator 5 in the inner air circuit 9, a condenser 7 in the outer air circuit 8, as well as a compressor 18 and an expansion valve.Alternatively or additionally, the refrigerant sensor 15 or a further refrigerant sensor 15 can be arranged in the interior of the cooling device 3, for example in an air duct of the internal air circuit 9, for example in the region of an opening through which the internal air circuit 9 opens into the interior 11 of the switch cabinet housing 2.

[0047] If the enrichment of the flammable refrigerant in the air contained in the interior space 11 is detected by the refrigerant sensor 15 to exceed a threshold value, a corresponding sensor signal can be received by the control and regulation unit 16, evaluated, and converted into a corresponding control signal to trigger the forced ventilation according to the invention. In the present case, the detection of the threshold value being exceeded would result in the fan 10 starting up. The fan 10 in the air duct 12 is configured to blow ambient air from the surroundings of the switch cabinet arrangement 1 through the air duct 12 into the interior space 11 of the switch cabinet housing 2. The closing element 14 is designed here as a check valve, which can be opened in the flow direction generated by the fan 10.The check valve is pre-tensioned to its closed position, so that when the fan 10 is deactivated, the first air duct 12 is closed. Similarly, the check valve 14 in the second air duct 13 is pre-tensioned to its closed position. If overpressure is generated in the switch cabinet interior 11 by the fan 10 while the check valve 14 in the first air duct 12 is opened, the check valve 14 in the second air duct 13 opens against its pre-tension, allowing the overpressure in the switch cabinet housing 2 to be reduced.The air taken up in the switch cabinet interior 11 and charged with the flammable refrigerant is blown out via the second air duct 13, thus through the housing 17 of the cooling device 3, into the environment of the switch cabinet arrangement 1, so that the exceeding of a threshold value for the concentration of the flammable refrigerant in the atmosphere in the interior 11 of the switch cabinet housing 2, which is critical for safety reasons, is avoided.

[0048] In the embodiment shown in Figure 2, the switch cabinet housing 2 is provided on a base 20. This can be a conventional switch cabinet base on which the frame of the switch cabinet housing is placed. In this case, the forced ventilation has an air duct 19 in the base 20, via which the interior 11 of the switch cabinet housing 2 is fluidly connected to the environment of the switch cabinet arrangement 1. In this case, three fans 10 are arranged in the base 20, in particular as part of the air duct 19. Depending on the embodiment, a different number of fans 10 may be expedient. The fans 10 are designed to either suck ambient air into the air duct 19 and blow it into the interior 11 via floor plates 21, or, in the opposite air duct direction, to blow the air taken in in the interior 11 through the floor plates 21 and the air duct 19 into the environment.The fans 10 can be designed as filter fans and close off the air duct 19 from the environment of the control cabinet assembly 1. The base plates 21 can be fluid-permeable, for example, perforated, and form the end of the air duct 19 directed towards the interior 11.

[0049] A refrigerant sensor 15 can be provided in the area of ​​the base, in particular the floor panels. The refrigerant sensor can also be arranged in the air duct, for example, in an air duct. Alternatively, the refrigerant sensor 15 can be arranged above the base in the switch cabinet housing, for example, on an inner side of a flat part of the switch cabinet housing 2 facing the interior.

[0050] The base 20 further comprises a cable feedthrough 26 which is fluidically separated from the air duct 19. Via the cable feedthrough 26, lines from the surroundings of the switch cabinet arrangement 1 can be introduced through the base 19 into the interior 11. The switch cabinet housing 2 has an opening 20 on its flat parts, in particular on its side walls, on its rear wall, on its front wall or door, or on its roof. It is not absolutely necessary that, as shown in Figure 2, all of the flat parts have a respective opening 20. Fewer openings 20 are also conceivable. The openings 20 can serve for an additional supply of fresh air or for the discharge of air charged with coolant, in particular for pressure equalization when the fans 10 of the air duct 19 in the base 20 are activated.To increase the air volume flow, at least one of the openings 20 can have an additional fan 27, for example a filter fan.

[0051] In the embodiment shown in Figure 3, the forced ventilation comprises a fan 10 in the roof of the switch cabinet housing 2 and an air inlet or outlet 23 in a side wall of the housing 2. A refrigerant sensor 15 is arranged inside the switch cabinet housing and is connected to the control and regulation unit 16 via a signal line. The control and regulation unit 16 is configured to activate the fan 10 when the refrigerant sensor 15 detects that a threshold value for a refrigerant concentration in the air contained in the interior 11 of the switch cabinet housing 2 has been exceeded.In the embodiments described above, the fan 10 can be configured to either blow ambient air into the interior space 11, so that the air inlet or air outlet 23 actually has the function of an air outlet, or to blow the air received in the interior space 11 out of the switch cabinet housing 2, so that the air inlet or air outlet 23 has the function of an air inlet.

[0052] In the embodiment shown in Figure 4, in contrast to the embodiment according to Figure 2, for the air transition between the air duct 19 in the base 20, at least one cutout is provided in a base plate instead of perforated base plates, into which at least one fan is inserted. The fan 10 furthermore has the refrigerant sensor 15. However, in a departure from this, the refrigerant sensor 15 can also be not a component of the fan 10 and can be connected to the fan 10, for example, in the manner described with reference to Figure 3. Accordingly, in the embodiment described in Figure 4, the control and regulating unit (not shown) is a component of the fan 10 and is implemented as a compact unit with the fan 10.Accordingly, the air duct has, at its end facing the environment of the switch cabinet arrangement 1, an air inlet or air outlet 23, which can be, for example, a cutout in the base 20 closed by a filter insert, for example a filter substrate.

[0053] In contrast to the embodiment shown in Figure 4, the fan 10 in the embodiment shown in Figure 5 is arranged in a cutout in a door element of the control cabinet housing 2.

[0054] Figure 6 shows, analogous to the embodiment according to Figure 3, a variant of the invention in which all components relating to the forced ventilation according to the invention are implemented in a fan 10 and an additional air inlet or air outlet 23. This embodiment is therefore particularly suitable as a retrofit solution if the cooling device 3 is not to be modified, in particular not to be replaced. In particular, in this embodiment, the refrigerant sensor is a component of the fan 10, which can in particular be designed as a filter fan inserted in a cutout of a flat part of the switch cabinet housing. An additional air inlet or air outlet 23 is required for pressure equalization. The air inlet or air outlet is also preferably closed off by a filter mat so that the relevant IP protection classes can be maintained.

[0055] Embodiments 7 to 9 describe, in particular, a fan 10 that is housed in a housing 28, including the control and regulation unit 16 required for activation in the event of a leak, in a single housing 28. The fan 10 can, for example, be designed as a filter fan that, as shown, is mounted in a cutout of the switch cabinet housing 2. The switch cabinet housing 2 has a filter element 30, for example a fleece, on an air inlet side, which seals the air inlet from the environment. In the embodiment according to Figure 7, the refrigerant sensor 15 is a component of the control and regulation unit 16, for example, arranged on a circuit board thereof.For cascading the signal from sensor 15, an alarm output is provided in the housing 28 for forwarding an alarm signal generated from the signal from sensor 15 by the control unit 16, for example, to control additional filter fans that do not have a sensor 15 or corresponding control electronics. Likewise, an alarm input 25 can be provided to control the fan 10 if the sensor 15 assigned to the fan 10 has not detected a leak itself, but another sensor (not shown) of a different fan or a sensor located at a different location in the control cabinet housing has already detected a leak, for example, because the other sensor is located closer to the leak location than the sensor 15 shown in Figure 7.

[0056] In the embodiment shown in Figure 8, in contrast to the embodiment according to Figure 7, the sensor 15 is arranged outside the housing of the inlet or outlet filter fan 28, for example at any location in the interior 11 of the switch cabinet housing 2. A connection point 32 of the inlet or outlet filter fan 28 is connected by wire or wirelessly to the sensor 15 in the interior 11.

[0057] The embodiment according to Figure 9 shows a variant in which the sensor 15 is directly connected to the control and regulation unit, for example hard-wired to a circuit board of the control and regulation unit 16.

[0058] The features of the invention disclosed in the above description, in the drawings and in the claims may be essential for the realization of the invention both individually and in any combination.

[0059] List of reference symbols

[0060] Control cabinet arrangement

[0061] Control cabinet housing

[0062] Cooling device

[0063] Refrigerant circuit

[0064] evaporator

[0065] Forced ventilation

[0066] Condenser

[0067] outer air circuit

[0068] inner air circuit

[0069] fan

[0070] Interior

[0071] Air duct

[0072] Air duct

[0073] locking device

[0074] Refrigerant sensor

[0075] Control and regulation unit

[0076] Housing

[0077] compressor

[0078] Air duct

[0079] base

[0080] floor panel

[0081] outbreak

[0082] Air inlet or air outlet

[0083] Alarm output

[0084] Alarm input

[0085] Cable entry

[0086] Additional fan Inlet or outlet filter fan Fan housing Filter substrate

Claims

Claims: Switch cabinet arrangement (i) with at least one switch cabinet housing (2) and at least one cooling device (3), wherein the cooling device (3) has a refrigerant circuit (4) containing a flammable refrigerant, wherein the refrigerant circuit (4) has an evaporator (5) which is arranged in an internal air circuit (9) of the cooling device (3) and through which air taken up in the switch cabinet housing (2) flows, characterized in that the switch cabinet arrangement (1) further has a forced ventilation (6) of the switch cabinet housing (2), which has an activated state when a leak in the refrigerant circuit (4) is detected and a deactivated state otherwise, wherein in the activated state ambient air of the switch cabinet arrangement (1) is conveyed into the switch cabinet housing (2) and / or the air taken up in the switch cabinet housing (2) is conveyed out of the switch cabinet housing (2).Switch cabinet arrangement (1) according to claim 1, in which the refrigerant circuit (4) is a component of a refrigeration machine and / or a heat pipe. Switch cabinet arrangement (1) according to claim 1 or 2, in which the refrigerant circuit (4) has a condenser (7) in an outer air circuit (8) of the cooling device (3) that is fluidically separated from the inner air circuit (9), wherein the condenser (7) is flowed through by ambient air conducted through the outer air circuit (8). Switch cabinet arrangement (1) according to one of the preceding claims, in which the forced ventilation (6) is fluidically closed in the deactivated state via an adjustable closing element (14), wherein the interior (11) of the switch cabinet housing (2) is fluidically separated from the environment of the switch cabinet housing (2).Switch cabinet arrangement (1) according to one of the preceding claims, in which the forced ventilation (6) has at least one fan (10) with which, in the activated state of the forced ventilation (6), ambient air is transported into the interior (11) of the switch cabinet housing (2). Switch cabinet arrangement (1) according to one of the preceding claims, in which the forced ventilation (6) has at least one air duct (12) between. the surroundings of the switch cabinet housing (2) and the interior (11) of the switch cabinet housing (2), which is closed by a closing element (14), preferably a non-return valve, when the forced ventilation (6) is deactivated. Switch cabinet arrangement (1) according to claim 6, wherein the at least one air duct (12) is a component of the cooling device (3), wherein at least one further air duct (13) is also a component of the cooling device (3) or a component of the switch cabinet housing (2). Switch cabinet arrangement (1) according to claim 7, wherein the cooling device (3) has two air ducts (12, 13), of which at least one air duct (12) has a fan (10), and wherein at least one of the air ducts (12, 13) has a closing element (14), preferably a non-return valve, which is permeable only in an air flow direction generated by the fan (10).Switch cabinet arrangement (1) according to one of the preceding claims, which comprises at least one refrigerant sensor (15) for detecting a flammable refrigerant in the air contained in the interior (11) of the switch cabinet housing (2). Switch cabinet arrangement (1) according to claim 9, wherein the switch cabinet arrangement (1) comprises at least one single-channel refrigerant sensor (15) that is sensitive to at least one flammable refrigerant, for example R32, Ri234yf, Ri234ze, propane, or butane.Switch cabinet arrangement (1) according to claim 9 or 10, wherein the switch cabinet arrangement (1) has at least two refrigerant sensors (15) for detecting a flammable refrigerant in the air contained in the interior (11) of the switch cabinet housing (2), wherein the at least two refrigerant sensors (15) are sensitive to at least one identical, flammable refrigerant, for example R32, Ri234yf, ri234ze, propane, or butane, wherein the two refrigerant sensors (15) are preferably designed to output their respective sensor signal in a single channel, preferably via the same channel. Switch cabinet arrangement (i) according to one of claims 9 to 11, wherein the at least one refrigerant sensor (15) is configured to forward the detection of a refrigerant in the air taken up in the interior space (11) of the switch cabinet housing (2) to a control and regulating unit (16) for initiating a safety measure for reducing a concentration of the refrigerant in the air taken up in the interior space (11) of the switch cabinet, wherein the control and regulating unit (16) is arranged inside or outside, preferably outside the switch cabinet arrangement (1), for example outside the switch cabinet housing (2) and outside the cooling device (3), and is connected to the at least one refrigerant sensor (15) via a signal interface for signal transmission, wherein the control and regulating unit (16) is configured to transfer the forced ventilation (6) of the switch cabinet housing (2) from the deactivated state to the activated state.Switch cabinet arrangement (1) according to one of claims 9 to 12, in which the at least one refrigerant sensor (15) is designed to forward the detection of a refrigerant in the air taken up in the interior (11) of the switch cabinet housing (2) to a control and regulating unit (16) arranged in the cooling device (3), wherein the cooling device (3) is designed to initiate a safety measure for reducing a concentration of the refrigerant in the air taken up in the interior (11) of the switch cabinet, preferably to transfer the forced ventilation (6) of the switch cabinet housing (2) from the deactivated state to the activated state.Switch cabinet arrangement (1) according to one of claims 9 to 13, wherein the at least one refrigerant sensor (15) is arranged in an air outlet flow of the internal air circuit (9) from the cooling device (3) into the interior space (11) of the switch cabinet housing (2) or in an air inlet flow of the internal air circuit (8) from the interior space (11) of the switch cabinet housing (2) into the cooling device (3). Switch cabinet arrangement (1) according to one of the preceding claims, wherein the cooling device (3) has at least one additional fan, by which ambient air from the environment of the switch cabinet arrangement (1) is sucked into a housing (17) of the cooling device (3) and blown into the interior space (11) of the switch cabinet housing (2). Switch cabinet arrangement (i) according to one of claims 9 to 15, wherein the cooling device (3) is configured to be deactivated upon detection of a flammable refrigerant by the at least one refrigerant sensor (15), so that at least one compressor (18) of the cooling device (3) is deactivated, wherein the switch cabinet arrangement (1) further comprises a safety device configured to prevent accidental restart of the compressor (18). Switch cabinet arrangement (1) according to claim 5, wherein the at least one fan (10) has a refrigerant sensor (15) which is acted upon by the air accommodated in the switch cabinet housing (2), wherein the at least one fan (10) is configured for ventilating or de-ventilating the switch cabinet housing (2).Switch cabinet arrangement (1) according to claim 17, wherein the at least one fan (10) blows the air absorbed in the switch cabinet housing (2) out into the surroundings of the switch cabinet housing (2) or blows ambient air of the switch cabinet housing (2) into the switch cabinet housing (2). Switch cabinet arrangement (1) according to claim 17 or 18, which has at least one further fan (27) designed as an inlet or outlet filter fan (28), wherein preferably the at least one fan (10) and the at least one further fan (27) are designed as fans with opposite flow directions with respect to the interior (11) of the switch cabinet housing (2). Switch cabinet arrangement (1) according to one of claims 17 to 19, wherein the at least one fan (10) is arranged in an opening in a vertical or horizontal wall of the switch cabinet housing (2) and is designed in particular separately from the cooling device (3).Switch cabinet arrangement (1) according to one of claims 17 to 20, in which the refrigerant sensor (15) is either arranged in a housing (29) of the at least one fan (10) on a circuit board of a control of the fan (10), or arranged on an outer side of the at least one fan (10) and connected in a wired or wireless manner to a control of the fan (10), or fastened to the switch cabinet housing (2) in the interior of the switch cabinet housing (2) and connected via a wireless or. wired signal interface is connected to the control of the fan (10). Switch cabinet arrangement according to one of claims 17-21, in which the fan (10) has an alarm output (24) configured to output an alarm signal when the fan (10) is transferred from the deactivated state to the activated state. The switch cabinet arrangement according to any one of claims 17-22, wherein the fan has an alarm input (25) configured to trigger the forced ventilation upon an incoming alarm signal, wherein the alarm input (25) is connected wirelessly or wired to an alarm output (24) of a further fan (27) of the switch cabinet arrangement (1) for transmitting the alarm signal. The switch cabinet arrangement (1) according to any one of the preceding claims, wherein the forced ventilation comprises an air duct (19) in a base (20) of the switch cabinet housing (2), via which air duct the interior (11) of the switch cabinet housing (2) is fluidically connected to the surroundings of the switch cabinet housing (2) via the base (20) of the switch cabinet housing (2).Switch cabinet arrangement (1) according to claim 22, in which the air duct (19) in the base (20) has at least one fan (10) with which, in the activated state of the forced ventilation (6), ambient air is transported into the interior (11) of the switch cabinet housing (2) or the air taken up in the interior (11) of the switch cabinet housing (2) is transported out of the interior (11) into the environment. Switch cabinet arrangement (1) according to claim 22 or 23, in which the base (20) is separated from the interior (11) of the switch cabinet housing (2) by at least one base plate (21), wherein the at least one base plate (21) is permeable to air at least in sections, for example perforated, wherein the base plate (21) forms a fluidic transition between the interior. (11) of the switch cabinet housing (2) and the air duct (19) in the base (20). Switch cabinet arrangement (1) according to claim 24, wherein the fluidic transition is a cutout (22) in the base plate (21), in which preferably a A fan (10) is mounted, with which either the air taken up in the interior(s) of the switch cabinet housing (2) is discharged into the environment through the air duct (19) or ambient air is introduced into the interior (11) of the switch cabinet housing (2). Switch cabinet arrangement according to claim 26 or 27, wherein the air-permeable base plate (21) is designed, at least in sections, as a cable feedthrough (26) through the base plate (21) and / or as an air-permeable fleece, for example a filter substrate (30).Switch cabinet arrangement (1) according to claim 25, wherein a fan (10) is arranged in a cutout (22) in a flat part of the switch cabinet housing (2), with which fan either ambient air is blown into the interior (11) of the switch cabinet housing (2) or the air absorbed in the interior (11) is discharged into the environment of the switch cabinet arrangement (1), wherein pressure equalization is provided via the air duct (19), wherein either ambient air is fed into the interior (11) or the air absorbed in the interior (11) is discharged into the environment. Switch cabinet arrangement (1) according to one of claims 22 to 26, wherein the switch cabinet housing (2) has at least one air inlet or outlet (23), preferably a cutout in at least one flat part, for example in a side wall, a rear wall, a door element, or a roof element of the switch cabinet housing (2).Switch cabinet arrangement (1) according to claim 27, in which the at least one fan (10) is arranged in the cutout (22), wherein the switch cabinet housing (2) or the base (20) has at least one further air inlet (23) or air outlet (23), preferably at least one further cutout. Switch cabinet arrangement according to one of claims 9 to 31, in which at least one refrigerant sensor (15) for detecting a flammable refrigerant is arranged in the base (20), for example in a housing (29) of a fan (10) of the forced ventilation and / or in the air duct (19), or on an upper side of the base (19) facing the switch cabinet interior. for example, on a base plate (21) of the base (20), or above the base (19) in the switch cabinet housing (2). - Switch cabinet arrangement (1) according to one of claims 9 to 32, which further comprises at least one refrigerant sensor (15) which is arranged in the air duct (19) or is supplied with air by the air duct (19) guided through the air duct (19), wherein the air taken up in the interior space (11) of the switch cabinet housing (2) is preferably discharged via the air duct (19) into the surroundings of the switch cabinet arrangement (1).Switch cabinet arrangement (1) according to one of claims 9 to 32, in which the at least one refrigerant sensor (15) is a component of the fan (10) and is exposed on a side of a housing (29) of the fan (10) facing the interior (11) of the switch cabinet housing (2), or in which the at least one refrigerant sensor (15) is arranged in the interior (11) of the switch cabinet housing (2) and is connected via a wired or wireless signal interface to a control and regulating unit (16) for converting the forced ventilation from the deactivated state to the activated state, wherein the control and regulating unit (16) can be a component of the fan (10) or can be designed independently of the fan (10).Switch cabinet arrangement (1) according to one of the preceding claims, in which at least one fan (10) is arranged in a cutout (22) in the roof of the switch cabinet housing (2), with which fan the air taken up in the interior (11) of the switch cabinet housing (2) is transported out of the switch cabinet housing (2), wherein the switch cabinet housing (2) preferably has at least one air inlet in a lower region of the switch cabinet housing (2), preferably a cutout (22) in a flat part of the switch cabinet housing. Switch cabinet arrangement according to one of the preceding claims, in which the interior spaces of a plurality of switch cabinet housings are fluidically connected to one another, wherein at least one of the switch cabinet housings has no means for monitoring the presence of a coolant in the air taken up in the interior of the respective switch cabinet housing.

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