ES2866406T3 - Security locker - Google Patents

Abstract

Safety cabinet, especially fire protection cabinet for the accommodation of hazardous substances, preferably a battery cabinet for housing and storing high-performance batteries such as lithium-ion batteries, with a cabinet body (4), as well as with al least one cabinet door (5) attached to the cabinet body (4) or interacting with it, and with at least one sensor (15), the sensor signals of which are evaluated by a control unit (11) of the cabinet. safety, characterized in that - the at least one sensor (15) is arranged in the cabinet body (4), - the control unit (11) derives from the sensor signals, in the event of an overshoot of at least a threshold value (S) and / or a limit value (G) of time gradients, a sensor signal and applying it to the closing of the door, - the control unit (11) initiating the closing of the door as soon as the control unit (11) interprets the sensor signals (15) as a closing signal, - the sensor (15) being configured as a temperature sensor, a smoke sensor, a gas sensor, a vapor sensor or a leak sensor, separately or in combination.

Description

DESCRIPTION

Security locker

The invention relates to a safety cabinet, especially a fire protection cabinet for housing dangerous substances, preferably a battery cabinet for housing and storing high-performance batteries such as lithium-ion batteries, with a cabinet body, as well as with at least one cabinet door attached to or interacting with the cabinet body, and with at least one sensor arranged on the cabinet body, the sensor signals of which are evaluated by a control unit.

Safety cabinets, as well as fire protection cabinets in general, are normally used to house dangerous substances such as liquid and flammable chemicals. However, they can also be stored inside, for example, gas bottles or hazardous solid materials. To protect hazardous substances from any external source of fire, safety cabinets or fire protection cabinets have a predetermined fire resistance corresponding to different fire resistance durations. In fact, the fire protection cabinets in question are usually classified according to DIN EN14470. In this case, a total difference is made between four levels of fire resistance duration of 15 minutes, 30 minutes, 60 minutes and finally 90 minutes, as described by way of example in the utility model DE 202014 101 935 U1 of the company applicant.

If a fire occurs outside such a safety cabinet, a fuse provided inside the safety cabinet ensures that the respective cabinet door or the plurality of cabinet doors close automatically in the event of a fire. This is because, in such a case, the fuse is activated, ensuring the closure of the respective swing door, as described, for example, in the state of the art according to document US 6,250,015 B1. Furthermore, in this case, a locking element on the swing door goes into its locked state. For this purpose, the locking element is attached to a spring.

In a comparable safety cabinet according to EP 0 170337 A1 the procedure is such that a door closing mechanism is activated to act on at least one door as soon as a temperature sensor detects an inadmissible temperature rise near the security locker. For this, the door closing mechanism is not normally coupled to the door and only anticipates its actuation as soon as the temperature sensor reacts.

In the state of the art according to DE 3527287 A1 an automatic closing system for fireproof cabinets is described. This system consists of a door closer that can be locked electromagnetically and an automatic closing mechanism. In the event of danger, the door closer pulls the door to close it, finally engaging the automatic closing mechanism, locking the door. The lock can be released again manually by means of a locking mechanism.

The state of the art has generally proven its effectiveness when it comes to providing an automatic closing of the door of a safety cabinet in the event of fire. However, current solutions work practically for the most part and exclusively in a purely mechanical way.

Indeed, in the further state of the art according to the generic document DE 102015 100532 U1 an electronic sensor and a control unit are implemented. The sensor for the emission and transmission of the sensor signals to the control unit is a sensor that measures the amount of air flowing through an exhaust air duct. In combination with a ventilation device, the amount of air extracted from inside the cabinet body can be controlled with the help of the control unit.

In the closest state of the art, according to DE 40 41 705 C1, an automatic closing system for fireproof cabinets with a closing mechanism is described. The closing mechanism is attached to a pull element on a cabinet door. Additionally, a power source for the pulling element for closing the door can be locked with the aid of a holding magnet controlled by a signal. The holding magnet can be activated by a signal. For this purpose, the power supply to the holding magnet can be interrupted by a smoke sensor or a fire sensor or by another hazard detector. In this way, the power source or a gas spring is activated and ensures that the door closes by means of the force of the gas spring.

In recent times, safety cabinets are also increasingly used to store batteries and especially high-performance batteries such as lithium-ion batteries. In other words, the safety cabinet in question is preferably a battery cabinet. In relation to this type of battery cabinets, there are already examples in the state of the art according to DE 101 14960 C1 in which a heat transfer device is implemented to regulate the temperature of the interior space of the housing. at a predetermined temperature level. This is intended to keep the interior space of the housing within a predetermined temperature range even in the event of large temperature fluctuations.

Handling batteries, and especially high-performance batteries such as lithium-ion batteries, can sometimes be problematic. This can be attributed, in essence, to the fact that batteries such as these can short-circuit one or more battery cells during the charging process and even during charging. storage. Such a short circuit can also occur by itself and without warning. This is even more serious since several lithium ion battery cells are typically interconnected to form a battery module.

This so-called overcharge behavior of lithium-ion battery cells of this type or of already connected lithium-ion batteries or also of the battery module has been found to be critical in practice. It should also be added that the problem increases considerably as a consequence of the increasing use of these batteries. In fact, a charging process above the maximum allowable voltage can cause damage to the battery cell, leading to a so-called "runaway" of the battery cell. As a result, explosions of the corresponding battery cell sometimes occur. Depending on the voltage level, such a short circuit can also cause an electric arc and consequently a fire. This can happen even with charged lithium-ion batteries and without an external influence on the storage state.

The invention is based on the technical problem of improving such a safety cabinet in such a way that the source of the fire originating especially in the interior space of the cabinet can be controlled in a simple and reliable way.

To solve this technical problem, a security cabinet according to claim 1 is made available.

Consequently, within the framework of the invention, at least one electronic sensor arranged in the cabinet body is used first. The control unit evaluates the sensor signals generated by the electronic sensor in question. As a consequence, the mechanical solutions as in the state of the art according to DE 3527287 A1 or according to EP 0170337 A1 are not expressly applied.

By using the electronic sensor and the corresponding sensor signals generated by it, the control unit can carry out a very specific evaluation of the respective sensor signal. Thus, the respective sensor signal can be evaluated in this sense to check whether at least one threshold value is exceeded. If the sensor in question is, for example and advantageously, a temperature sensor, the threshold value in question corresponds to a limit temperature. As soon as this limit temperature is exceeded inside the cabinet body, the control unit consequently derives the closing signal, this closing signal ensuring that the cabinet body door closes or (if it is already closed) stay closed. The door can be additionally locked.

This ensures that the safety cabinet according to the invention, and preferably the battery cabinet, is closed or remains closed in any case if, for example, a fire source develops inside, which in the present case corresponds to the sensor configured as a temperature sensor exceeding the previously established limit temperature.

At this point, it is also possible to work in principle with several threshold values. That is, as soon as the sensor signal in question exceeds, for example, a first limit value and then a second limit value or a first limit temperature and then a second limit temperature, the control unit interprets it as a signal of closing. This closing signal can be evaluated in such a way that, upon generating the closing signal, the control unit actuates a door closing mechanism. The door closing mechanism is responsible for closing the closet door or the plurality of closet doors. Naturally, the door or cabinet door in question remains closed if it has already assumed this state when the closing signal is issued. In such a case, the door closing mechanism practically provides for an additional locking of the door or the cabinet door.

An even more precise and specific evaluation of the sensor signal is observed if, alternatively or in addition to exceeding the at least one threshold value, the control unit interprets the exceeding of a limit value of time gradients as a closing signal . In this case, the temporal changes of the respective sensor signal, ie the temporal gradients, are evaluated. As soon as the respective gradients or the respective time slopes of the resulting sensor signal over time exceed a predetermined and predetermined limit value, the closing signal is shunted. For example, you can imagine that the sensor signal increases by 20% or even more in 10 seconds. In the case of the example, this indicates the development of a short circuit of a lithium ion battery inside the safety cabinet.

To prevent a fire originating as a result of the short circuit from spreading outside the safety cabinet, in the case of the example described, the sensor signal in question or its increase over time causes the control unit to derive the control signal. closing from exceeding the limit value for the gradient (increase of more than 20% of the sensor signal in 10 seconds). As described, as soon as the closing signal is generated, the control unit actuates the door closing mechanism. In this way, the cabinet door assigned to the cabinet body is closed in due time, thus preventing a fire originating inside the safety cabinet from spreading to the outside. In a way it is also possible to "smother" the fire by closing the closet door.

According to an advantageous configuration, if the closing signal is generated, the control unit operates not only the door closing mechanism, but also an exhaust air unit if necessary. That is to say, in this case, the closing signal is interpreted in the sense that it is not only necessary to close to the outside any source of fire that arises inside the safety cabinet, but that, at the same time, act in your case about an exhaust air unit additional, in order to evacuate the vapors that are generated inside the safety cabinet. This can be done in addition to stressing the door lock mechanism.

According to another variant of the invention of particular importance, provision is made to divide the cabinet body inside into at least two segments with one sensor respectively assigned. The respective segment may be a transverse segment. In this sense, it has also been found advantageous to provide several drawers and / or removable shelves inside the cabinet body, in order to segment the interior space of the cabinet. Generally, in this case a transverse segmentation takes place, although of course a longitudinal segmentation or both longitudinal and transverse segmentation of the interior space of the wardrobe or of its wardrobe body are also possible, the invention encompassing this possibility.

In this regard, the invention is based as a whole on the knowledge that a safety cabinet configured, for example, as a battery cabinet, is usually equipped inside with a plurality of drawers and / or removable shelves to store the various batteries, especially lithium-ion batteries, in the appropriate drawers or shelves. In order that in this case the eventual generation of a fire source can be precisely determined, in the case of the example a respective sensor is assigned to each cross segment. If the sensor is a temperature sensor, it detects an increase in temperature inside the cabinet body, specifically separately for the respective cross section.

In this way, the safety cabinet according to the invention can not only react in advance to future sources of fire that occur locally, but thus the possible source of fire can also be located. This is because, depending on the respective transverse segment, whose sensor has triggered a closing signal from the control unit, the origin of the fire can be located locally inside the cabinet body and, for example, be reproduced graphically on a screen connected to the control unit. In this case, the design is generally carried out in such a way that the control unit initiates the closing of the door as soon as the control unit interprets the sensor signals from only one of the sensors as a closing signal.

In other words, the control unit evaluates the various signals of the sensors assigned to the segments with respect to the exceeding of at least one threshold value and / or of a limit value of time gradients in the direction of an "OR" operation. As soon as at least one of the sensors or the sensor signals generated by it meet the specific criterion of exceeding the threshold value and / or the predetermined limit value of the temporal gradients of the sensor signal, the control unit interprets this done as a whole as a sign of closure. As described above, in case of generating the corresponding closing signal, the control unit operates the door closing mechanism and, where appropriate, the exhaust air unit. By "OR" operation of the various sensor signals of the sensors in the corresponding segments it is ensured that, in the case of the example, any local excess of the temperature will lead to the closing of the door. Of course, this also applies precisely in the event that several local temperature exceedances are detected.

In order to adequately detect the individual segments inside the cabinet body with the aid of the corresponding sensors, the sensors in question are advantageously connected to the cabinet body respectively from the inside. As already explained, the sensor is advantageously a temperature sensor. In principle, the sensor can alternatively or additionally be configured as a smoke sensor, a gas sensor and / or a vapor sensor. Consequently, in this case the sensor detects excessive development of smoke, gas or steam inside the cabinet body that give rise (as in the case of the temperature sensor) to a closing signal.

Alternatively or additionally, the sensor can also be a leak sensor. In this case, the sensor detects eventual leaks, for example, from containers of hazardous materials stored inside the cabinet body. As soon as the leak exceeds a certain threshold value, the control unit interprets it again as a closing signal, causing the control unit to actuate the door closing mechanism. Finally, the sensor can be additionally configured as a door close sensor. In this case, the sensor additionally monitors the functional state of the cabinet door, that is, whether it is open or closed with respect to the cabinet body.

In detail, the door closing mechanism is usually equipped with an automatic door closer. In this case, the automatic door closer is activated in the event of a closing signal. For this, the door closing mechanism has at least one electromagnet on which the control unit acts. The electromagnet holds the cabinet door in the open position indirectly or directly against the force of a spring.

Finally, the door closing mechanism is also advantageously provided with a locking element. The locking element remains in its unlocked position at all times. Only in the event of a closing signal, the locking element assumes its locked position. This operation can be carried out by means of a spring. As a result, a safety cabinet and especially a battery cabinet designed for the storage of lithium-ion batteries is made available. In this way, spontaneous ignition or fires associated with the storage of batteries of this type are controlled effectively and automatically. For this purpose, the safety cabinet according to the invention evaluates the signals from a single sensor or from several sensors, and especially from temperature sensors, present inside the cabinet body.

If the sensor signals emitted by the sensor in question exceed a predetermined limit value or show an abnormal increase in their signal over time, the control unit interprets this as a whole as a closing signal. The close signal causes the control unit to actuate a door closing mechanism.

As a consequence, the development of a possible source of fire, even if it is local, inside the cabinet body already ensures the correct closing of the corresponding cabinet door. In this way, the invention guarantees that a source of fire that arises inside the cabinet body cannot spread to the outside. Thus, much greater security is achieved. This is where the main advantages are appreciated.

The invention is explained in more detail below in the light of a drawing that represents only one embodiment; It is shown in:

Figure 1 a security cabinet according to the invention in a perspective view,

Figure 2 the safety cabinet schematically in a modified embodiment with segmented interior space,

Figure 3 the door closing mechanism in an overview and

Figure 4 a general representation of several security cabinets according to the invention.

The figures represent a safety cabinet conceived in the present case and in a non-restrictive way as a battery cabinet that serves for the storage of the batteries only indicated in figure 1. In this case, the batteries 1 are supported, by one part, on a shelf 2 and, on the other hand, they are housed in a drawer 3. The shelf 2 and the drawer 3 can be removed respectively from the cabinet body 4 with the doors 5 open, in order to be able to take the different batteries 1 that are in it or place them for storage. Of course, this only applies by way of example.

In the case of the two cabinet doors or doors 5, these are hinged doors or cabinet doors 5 connected with the possibility of turning to the cabinet body 4. Furthermore, in the exemplary embodiment and in a non-restrictive way, the two doors hinges 5 are hingedly joined to a common connecting element 7 by push rods 6. This option can be seen in a comparison of figures 1 and 3. The common connecting element 7 for hinged doors 5 is guided inside of the cabinet body 4 with the help of a rail 8.

If the cupboard doors 5 or the hinged doors are closed, the common connecting element 7 assumes its retracted position with respect to the rail 8. In this retracted position a spring 9 is released, which can be seen in figure 3. The spring 9 is released. it extends, by way of example, along the rail 8. If, on the contrary, the wardrobe doors or the hinged doors 5 assume their open position, the spring 9 is tensioned.

In the exemplary embodiment, so that the cabinet doors 5 can adopt and maintain the open position, at least one electromagnet 10 is provided. In fact, according to the exemplary embodiment, two electromagnets 10 are provided on both sides of the rail 8 and at the side of the head inside the cabinet body 4. With the help of the electromagnets 10, the connecting element 7 is held in the open position of the two cabinet doors 5. For this purpose, in the case of the example, the Two electromagnets 10 are activated with the help of a control unit 11. The spring 9 is tensioned.

To close the wardrobe doors 5 it is only necessary to stop applying current to the electromagnets 10. As a consequence, the two electromagnets 10 release the common connecting element 7 from a metal, especially magnetizable steel, which was previously magnetically attracted, in such a way that the connecting element 7 passes into its retracted position, the spring 9 previously tensioned along the rail 8 relaxing. Consequently, the two cabinet doors 5 automatically pass from their open position to the closed position. In this sense, a door closing mechanism 6, 7, 8, 9, 10, 12 is made at this point, composed of the two push rods 6 of the wardrobe doors 5, the common connecting element 7, the rail 8 for guiding the connecting element 7, the spring 9 and, finally, one or both electromagnets 10 to which the control unit 11 applies the current.

Furthermore, within the framework of the exemplary embodiment, the door closing mechanism 6, 7, 8, 9, 10, 12 is still assigned a locking element 12 which is kept in its unlocked position at all times and which only adopts its locked position in response to a close signal explained later. In the exemplary embodiment and as shown in the comparison of Figures 1 and 3, the locking element 12 is configured as a locking pin that the control unit 11 maintains at all times in its unlocked position, that is, retracted. with respect to the cabinet body 4. Only when the control unit 11 generates a closing signal does the locking element 12 go into its locked and exposed position with respect to the cabinet body 4. In the locked or exposed position, the element The lock 12 or the locking pin fits into one or both of the cabinet doors 5, ensuring that they are locked relative to the cabinet body 4 and cannot be opened.

As a component of the door closing mechanism 6, 7, 8, 9, 10, 12 there is also realized an automatic door closer 7, 8, 9 which the control unit 11 activates in the case of the above-mentioned closing signal. The door closer 7, 8, 9 consists of the connecting element 7, the rail 8 and the spring 9. Furthermore, the door closing mechanism 6, 7, 8, 9, 10, 12 has the at least one electromagnet 10 already mentioned on which the control unit 11 acts. The electromagnet 10 keeps the corresponding cabinet door 5 in the open position against the force of the spring 9.

Returning to figure 1, the basic and essential structure continues to include an exhaust air unit 13, 14 attached to the cabinet body 4 and communicated with its interior space. In the present case, the control unit 11 is arranged protected by the head side of the cabinet body 4 or attached to it. Furthermore, the control unit 11 operates the exhaust air unit 13, 14 if necessary. Furthermore, the at least one locking element 12 is attached to the unit. control 11. Similarly, the at least one or both electromagnets 10 are attached or coupled to the control unit 11. This can be seen in a comparison of Figures 1 and 3.

At least one sensor 15 arranged in the cabinet body 4 is of particular inventive importance. By means of the general representation in FIG. 2 it can be seen in particular that in the exemplary embodiment three sensors 15 connected respectively on the inside to the cabinet body 4 are implemented. In the exemplary embodiment and in a non-restrictive way, in the The sensors 15 are respectively temperature sensors. Furthermore, the representation of FIG. 2 clearly shows that the cabinet body 4 is internally divided into at least two segments, in the present case into a total of three segments 41, 42 and 43, with an assigned sensor 15 respectively. In this case, the division of the cabinet body 4 into the aforementioned transverse segments or segments 41, 42 and 43 basically follows the arrangement and assembly inside the cabinet body 4 of the respective drawers 3 designed and conceived in the case. of the example for the accommodation of the individual or several batteries 1. Naturally, instead of the drawers 3 it is also possible alternatively or additionally to make and apply the shelves 2 in this context.

The control unit 11 evaluates the sensor signals generated by the respective sensors 15 for the closing of the door. This is represented graphically and schematically and by way of example in Figure 2 by means of a diagram reproduced therein. It can be seen that the sensor signal 15 or a corresponding current I fluctuates over time t. In particular, it can be clearly seen from the diagram that from a moment t ¹ the time-dependent sensor signal I (t) exceeds a limit value G of a time gradient indicated in the illustration. In other words, the limit value G of the temporal gradient indicates a certain slope of the sensor signal I (t) over time t. Within the framework of the invention, as soon as the measured sensor signal I (t) exceeds the relevant gradient associated with the limit value G, the control unit 11 drifts and generates a closing signal and evaluates the sensor signals 15 at question. The closing signal thus generated in the control unit 11 is applied to closing the door of one or more cabinet doors 5, as described in greater detail below.

As an alternative or in addition to the evaluation of the time derivatives of the sensor signal I (t), the control unit 11 can also simply interpret one or more threshold values S or their overshoot as a closing signal. This is also shown in the diagram in the form of a threshold value S, represented by a dashed line, which corresponds to a predetermined absolute value of the sensor signal I (t). Of course, both methods can be combined in principle as well. In this case, for example, exceeding a limit value G for the time gradient and additionally a threshold value S for the absolute value of the sensor signal I (t) causes the control unit 11 to derive the signal of closing already mentioned. In any case, the closing signal generated by the control unit 11 is applied to the closing of the door. To do this, the control unit 11 is connected to the door closing mechanism 6, 7, 8, 9, 10, 12 or, if the closing signal is issued, it operates the door closing mechanism 6, 7, 8 , 9, 10, 12 so that the cabinet door 5 is closed. Within the framework of the exemplary embodiment, the presence of the closing signal in the control unit 11 additionally results in the control unit 11 also requesting the exhaust air unit 13, 14.

As a consequence, even a possible source of fire detected locally inside the cabinet body 4 not only leads to a closing of the two cabinet doors 5 in the case of the example with the help of the door closing mechanism 6, 7 , 8, 9, 10, 12, but this also causes stress on the exhaust air unit 13, 14, in order to be able to evacuate as completely and precisely as possible from inside the cabinet body 4 the vapors or the gases that are generated when the fire occurs. Furthermore, due to the described segmentation of the interior of the cabinet body 4, the possible source of fire can be located, as well as assigned to the corresponding segment 41, 42, 43 and made visible, for example, with the help of a connected display unit to the control unit 11. The control unit 11 evaluates the various sensors 15 so that the control unit 11 initiates the described door closing as soon as the sensor signals from only one of the sensors are interpreted as a signal signal. closing by the control unit 11. Consequently, as soon as the sensor signal of one of the three sensors 15 exceeds in the case of the example the limit value G of the time gradient or the threshold value S according to the representation in the diagram, deriving, as a consequence, the control unit 11 the closing signal, this is altogether sufficient for the control unit 11 to close the safety cabinet and actuate the closing mechanism d e gate 6, 7, 8, 9, 10, 12.

In this sense, the locking element or the locking pin 12 is kept in its unlocked position at all times, that is, in the retracted position with respect to the cabinet body 4. In this unlocked position of the locking element 12, the two cabinet doors 5 can be easily opened and closed. However, if after consulting the sensor signals of one or more sensors 15, the control unit 11 detects and generates the closing signal, the locking element 12 assumes its locked position. This can be carried out in such a way that the control unit 11 maintains the locking element or the locking pin 12 in its unlocked position by means of a motor. As soon as the control unit 11 issues and generates the closing signal, the motor stressing of the locking element 12 ceases, which consequently assumes its locked position. In this way, the cupboard doors 5 are, in a way, secured in two ways.

If when the closing signal is generated in the control unit 11, the cabinet doors 5 are open, the closing signal causes the control unit 11 to actuate the door closing mechanism 6, 7, 8, 9, 10, 12 for closing the two cabinet doors 5. Subsequently or simultaneously, the control unit 11 actuates the locking element 12 so that it assumes its locked position. In this way, the two cabinet doors 5 are not only closed, they are also blocked. If when the closing signal is generated in the control unit 11, the two cabinet doors 5 should already be closed, the locking element 12 ensures in this case that the already closed cabinet doors 5 are locked in any case when the door is generated. close signal on control unit 11.

In any case, the safety cabinet according to the invention closes automatically at all times when a fire source occurs inside it. In addition, in the case of the example described, the two cabinet doors 5 are also locked relative to the cabinet body 4. In this case, this is of course an option that is not mandatory. At the same time, the control unit 11 acts on the exhaust air unit 13, 14, so that any vapors that are generated as a result of the fire source inside the cabinet body 4 are reliably extracted. Thus, the overall security is greatly increased.

Claims (10)

1. Safety cabinet, especially fire protection cabinet for housing hazardous substances, preferably a battery cabinet for housing and storing high-performance batteries such as lithium-ion batteries, with a cabinet body (4), as well as with at least one cabinet door (5) attached to or interacting with the cabinet body (4), and with at least one sensor (15), the sensor signals of which are evaluated by a control unit (11) of the security cabinet, characterized by - the at least one sensor (15) is arranged in the cabinet body (4), - deriving the control unit (11) from the sensor signals, in the event of an exceeding of at least a threshold value (S) and / or a limit value (G) of time gradients, a sensor signal and applying it to close the door, - the control unit (11) initiating the closing of the door as soon as the control unit (11) interprets the sensor signals (15) as a closing signal, - the sensor (15) being configured as a temperature sensor, a smoke sensor, a gas sensor, a vapor sensor or a leak sensor, separately or in combination. Security cabinet according to claim 1, characterized in that the cabinet body (4) is divided on the inside into at least two segments (41, 42, 43) with a respectively assigned sensor (15). Security cabinet according to claim 2, characterized in that the segments (41, 42, 43) are configured as transverse segments. Safety cabinet according to claim 2 or 3, characterized in that the control unit (11) evaluates the sensor signals of the respective sensors (15) for closing the door. Safety cabinet according to one of Claims 1 to 4, characterized in that the at least one sensor (15) is connected to the cabinet body (4) on the inside. Safety cabinet according to one of Claims 1 to 5, characterized in that several drawers (3) and / or removable shelves (2) are provided for segmentation of the interior space of the cabinet. Safety cabinet according to one of Claims 1 to 6, characterized in that, when the closing signal is output, the control unit (11) actuates a door closing mechanism (6, 7, 8, 9, 10, 12) and, where appropriate, an exhaust air unit (13, 14). Security cabinet according to claim 7, characterized in that the door closing mechanism (6, 7, 8, 9, 10, 12) has a locking element (12) that remains in position at all times. unlocked and only adopts its locked position in the event of a closing signal. Security cabinet according to claim 7 or 8, characterized in that the door closing mechanism (6, 7, 8, 9, 10, 12) has an automatic door closer (7, 8, 9) which is activated in the event of a closing signal. Safety cabinet according to one of Claims 7 to 9, characterized in that the door closing mechanism (6, 7, 8, 9, 10, 12) has at least one electromagnet (10) requested by the control unit (11) that keeps the cabinet door (5) in the open position against the force of a spring (9).