EP1580340A2 - Explosion-proof cupboard and explosion-protecting arrangement - Google Patents

Abstract

Explosion-proof cabinet (10) comprises a receiving chamber with a gas-permeable open side. All the other side walls (28, 32, 34) are sealed in a gas-tight manner. The open side faces into the open air. An independent claim is also included for an explosion-proof arrangement in a room with an outer wall (38) having an opening on which the above explosion-proof cabinet is positioned with its open side.

Description

The invention relates to an explosion protection cabinet.

Furthermore, the invention relates to an explosion protection arrangement in a room with an outer wall.

For experiments with critical gases such as hydrogen is well defined Operating conditions and well-defined environmental conditions explosion-proof environment required. The environment can be zoned Division, where the explosion-proof environment is a special zone. For example, the ignition limit of hydrogen in air is at a volume fraction of 4% hydrogen.

The invention is based on the object, an explosion protection cabinet to provide with the potentially explosive parts of a test arrangement to live in.

This object is achieved with an explosion protection room with solved a receiving space, which is a gas-permeable open side includes and is closed gas-tight on all other sides, with the open Side into the open.

In the solution according to the invention that part of the explosion protection cabinet, which points into the interior of a room, gas-tight closed. However, gas exchange is possible with the outdoors. This makes it possible as - passive - Explosion protection measure prevent a too large concentration of a critical gas such as hydrogen in the receiving space can.

By the solution according to the invention can be in a particular not partition explosion-proof area into an explosion-proof area. This explosion-proof area can be relatively low Provide costs and relatively little technical effort. The solution according to the invention makes possible an explosion-proof enclosure, the potentially explosive parts of a test setup (such as a Fuel Cell System) record. The enclosure is basically approvable. It does not have the entire room converted become.

In particular, at least one (non-closable) opening is provided, which flows into the open air. About such an opening is a gas exchange with the free so that it can be prevented that critical gas concentrations can accumulate in the recording room.

It is particularly advantageous if the explosion protection cabinet for positioning is provided on an outer wall with an outer wall opening. Opposite the interior of the room where the explosion-proof cabinet is located is, gas-tightness is ensured while gases are discharged to the outside can be.

Conveniently, the outer wall opening is so large that the open side of Recording room is not obscured. It is then ensured that over the Outside wall no blocking, which limits the explosion protection could take place.

In one embodiment, opposite side walls are provided. Furthermore, a front wall is provided.

Advantageously, the front wall has a smaller width than an adjacent one Side wall. The open side can then be opposite the front wall form. This allows the dimensions of the outer wall opening keep low.

In particular, the open side is opposite the front wall.

Furthermore, it is favorable if a bottom is provided. This can be the Reception room opposite the interior of the room in which the explosion-proof cabinet is arranged, completely encapsulate. Over the ground can be the explosion protection cabinet also on a base (in particular the Floor of the room in which the explosion protection cabinet is arranged) fix. As a result, it can be achieved that the cabinet construction opposite an internal overpressure such as 25 mbar is stable. It can be thereby also a seal of the interior of the room with respect to the receiving space of the explosion-proof enclosure.

It is also advantageous if a roof is provided as a lid. This ensures a gas-tight closure on a cabinet top.

It is particularly advantageous if the roof is designed as a pent roof and in particular has an increasing inclination towards the open side. A gas such as hydrogen, which is lighter than air, can then be at the inclined Along the roof to the open side. This in turn Such a gas can be easily removed from the receiving space to in turn preventing gas accumulation in the receiving space.

In particular, the receiving space is closed gas-tight on five sides. He is then gas-tight on all sides, which lie within a room.

This can be achieved in that opposite side walls gas-tight connected to a floor, a roof and a front wall.

It is particularly advantageous if on the open side into the open opening inlet air opening is provided. This supply air opening is always unlocked. It can thereby guarantee that air circulation takes place can, in turn, gas accumulations of a critical gas such as hydrogen to prevent in the receiving space.

In particular, the supply air opening is in the vicinity of a floor of the explosion protection cabinet arranged. If the critical gas is lighter than air (as it is when hydrogen is the case), then it is achieved that a circulation can train over which the critical gas from the receiving space dissipated is.

It is then also favorable if on the open side an opening into the open Exhaust opening is provided. About this exhaust port can be a critical Remove gas such as hydrogen from the receiving space.

It is particularly advantageous if the exhaust air opening in a related in the direction of gravity the highest area of the explosion protection cabinet is arranged. Since hydrogen is lighter than air, it prefers to collect in an upper area of the cabinet. He then lets himself over the exhaust opening dissipate from this area.

It is then also advantageous if the exhaust opening on a roof or in the Near a roof is arranged. Preferably, the roof is inclined. About the tilted roof lets itself hydrogen in the direction of a highest point in the Lead the explosion protection cabinet. If the exhaust opening is located there, then it is ensured for an optimal decoupling, d. H. Hydrogen can be active be dissipated. This also applies to other gases that are lighter than air.

To protect an opening, a gas-permeable protective grid such as a slat plate or a perforated plate may be provided. Thereby can a protection of the receiving space against the weather, Reach dirt, small animals, etc.

It is basically possible that the open side remains completely open. Cheap is However, if the receiving space on the open side partially opposite covered outdoors, just to protect against the weather, To get dirt etc. In particular, the cover is such that a heat insulation for the receiving space compared to the outdoors is provided.

It is favorable, if at the open side between a Zuluftöffnung and an exhaust port at least one lightweight board is arranged. Because lightweight panels have a relatively small weight, the removal of such Lightweight panels on the open side easier. It can be, for example cause, if a certain overpressure threshold in the receiving space is reached, the lightweight panels by itself from the open side fall out and thus just release the open side.

A cover can be achieved in a simple manner that a Plurality of stacked lightweight panels is provided.

In particular, the at least one lightweight board is kept loose, so that just dropping out is possible. The loose hold can be, for example realize that the at least one lightweight board with tape is fixed. The adhesive force of the adhesive tape is then such that when exceeded an overpressure threshold, the holder is released and the at least one Lightweight panel falls out.

In particular, the at least one lightweight board is arranged so that they at a given pressure in the receiving space falls out and thus the open side releases. This overpressure is for example of the order of magnitude set by 10 mbar.

Conveniently, the explosion-proof cabinet is closed on all sides except for a page pointing to the outside. This is opposite to a gas-tight seal the interior of a room where the explosion-proof cabinet is located is reached. But it is possible to exchange gas with the outside, so that as active explosion protection measure the gas accumulation in the receiving space is avoided.

It is particularly advantageous if a design for overpressure compared the environment takes place. By an appropriate overpressure resistance of Explosion protection cabinet, in particular with respect to the interior of the room, in which the explosion protection cabinet is located, just a protection is achieved. For example, the overpressure resistance to an overpressure of the Order of magnitude 25 mbar designed.

To be able to stack devices and experimental arrangements in the receiving space, this must be subdivided. It is particularly advantageous if the receiving space is divided by at least one transverse floor, the plurality having through openings. Through the through openings allows gas exchange and thereby prevents that a gas cushion can form below a transverse floor. This carries in that accumulations of a critical gas within the receiving space be avoided. In particular, the at least one transverse floor provided with a lateral beading. This will increase the stiffness (Stability against deflection) in the storage of objects increased. In particular, flanges are provided on all sides of a transverse floor.

There may be at least one door to provide access to the recording room be provided, which is removable as a whole. A such door can be securely fixed with the appropriate wall.

In particular, the at least one door is arranged on a side wall, wherein the side wall has a corresponding length.

A fixation can be achieved in a simple and secure manner, if one Plurality of screw caps is provided. These screw caps are arranged on the edge of the door so as to obtain a secure fixation can.

Conveniently, at least one media plate is provided via the one or several media can be coupled into the recording room and / or decoupled are. About the media plate can be gaseous media and Coupling or decoupling liquid media, wherein the coupling / decoupling is possible in a simple manner and in a simple way also a tightness is guaranteed.

In particular, the at least one media plate is removable and by means of a plurality of screw caps on the associated wall can be fixed. It can thus achieve a secure fixation, the enclosure of the Working space is gas-tight. The removability also results in a simpler Access to the recording room.

Conveniently, the at least one media plate is one or more Provided bulkhead fittings. It can then be pipes such as piping or hoses through the media plate, with a gas tightness the implementation is guaranteed.

It is particularly advantageous if a seal in the region of the open Side provided on an external wall and / or on an external floor is. The seal is in particular a circumferential seal. The explosion protection cabinet according to the invention is so far to the Grewed seal and then fixed in this position, that the room, in the explosion protection cabinet is placed over the seal in the area the outer wall is sealed off from the receiving space.

Conveniently, at least one gas sensor is arranged in the receiving space. For example, it is a hydrogen-in-air gas sensor. The provision of at least one gas sensor serves as an active explosion protection measure, around (pre-) critical gas concentrations within the receiving space to be able to detect.

For example, the at least one gas sensor is in the vicinity of a cabinet top arranged. It can then be gases that are lighter than air (like Hydrogen), detect it safely.

In particular, the explosion protection cabinet is fixed with a base. For example is a floor of the explosion protection cabinet bolted to the base. It is ensured by a gas-tightness.

In particular, this allows the explosion protection cabinet in a Fix the position opposite to an outer wall, so that here the gas-tightness is ensured.

It is particularly advantageous if the explosion protection cabinet in his Volume is dimensioned so that in an emergency shutdown of a gas supply upon detection of a certain gas concentration taking into account an explosive limit in pipes and in the receiving space remaining gas is not achieved. If an emergency shutdown of the gas supply takes place, then remains in the line area between the explosion protection cabinet and a check valve still a certain amount of gas. If an internal gas sensor detected a certain gas concentration, then this means that a certain amount of gas is present in the explosion protection cabinet. In the inventive Dimension of the explosion protection cabinet is always ensured that the total concentration of the gas is below an explosion limit remains.

The explosion protection cabinet according to the invention can be easily produce, if it has a rectangular cross-section.

It is advantageous if on at least one wall removable plate elements are arranged. These plate elements may be used as media plates and / or be formed simple plate elements. It is possible, for example during the construction of an experimental setup from multiple sides to be able to access the recording room.

It is favorable if at least one gas sensor with respect to the direction of gravity is arranged above the explosion protection cabinet. By means of such a gas sensor, which is arranged outside of the explosion protection cabinet is, the gas-tightness of the explosion-proof cabinet can be monitored.

It can then perform an emergency shutdown when in the room, in the explosion protection cabinet is located, too high a gas concentration is detected.

In particular, an emergency shutdown device is provided for this purpose, which in the case of Detection of a specific gas concentration within the explosion protection cabinet or the electrical supply outside the explosion-proof enclosure switches off and locks the gas supply to the explosion-proof cabinet. Preferably the emergency shutdown occurs when a certain gas concentration either inside or outside the explosion-proof enclosure or a certain critical gas concentration both inside and out outside the explosion-proof enclosure.

The invention is also based on the object, an explosion protection arrangement to provide in a room with an exterior wall, which is simple Way is feasible.

This object is achieved in that the outer wall with an outer wall opening is provided, at which an inventive Explosion protection cabinet is positioned with its open side.

The explosion protection arrangement according to the invention already has in connection explained with the explosion protection cabinet according to the invention Advantages.

In particular, the explosion protection cabinet is opposite the room interior gas-tight.

Advantageously, this is a seal between the explosion protection cabinet and the outer wall and / or a base for the explosion protection cabinet intended.

Conveniently, the seal is circumferential so as to provide a complete seal between the explosion protection cabinet and the outer wall or the Underlay and thus between the receiving space and the interior of the Room in which the explosion protection cabinet is arranged to provide.

It is furthermore advantageous if at least one gas sensor is arranged in the room is. This allows the gas concentration in the room to be monitored. It can be thereby monitor the tightness of the explosion protection cabinet. Further leaves As a result, perform a monitoring for line break.

Conveniently, the gas sensor is coupled to a valve via which the Gas supply through the room is lockable. So if the gas sensor to one high concentration detected, then it allows the gas to enter the room Lock yourself so that no more gas can escape into the room.

In particular, the valve is designed as a check valve. The check valve is in closed to its basic state. This means that in case of failure of the gas sensor or a control device for the check valve, the valve is closed becomes.

It is also advantageous if in the receiving space at least one gas sensor is arranged, which is coupled to a valve, via which the gas supply can be blocked to the explosion protection cabinet. If in the explosion-proof cabinet If an excessively high gas concentration is detected, then this can be done block the further coupling of gas in the explosion protection cabinet.

For the same reasons as above, it is beneficial if the valve is a check valve is trained.

In particular, the valves to which a gas sensor in the room and a gas sensor are coupled in the explosion protection cabinet, arranged in series. It can then lock the gas supply in the explosion protection cabinet, if too high a gas concentration inside or outside the explosion protection cabinet is detected.

In particular, an emergency shutdown device is provided by means of which the power supply for the explosion protection cabinet (for components in the Explosion protection cabinet) as a function of measured gas concentrations switch off. If too high a gas concentration within the Explosion protection cabinet or outside the explosion protection cabinet is detected, then it can be automatically the power supply lock.

Figur 1

eine schematische perspektivische Ansicht eines Ausführungsbeispiels eines erfindungsgemäßen Explosionsschutzschranks;

Figur 2

eine andere perspektivische Ansicht des Explosionsschutzschranks gemäß Figur 1;

Figur 3

eine Ansicht in der Richtung 3 gemäß Figur 1;

Figur 4

eine Seitenansicht in der Richtung 4 gemäß Figur 1 und

Figur 5

eine schematische Darstellung eines Ausführungsbeispiels einer erfindungsgemäßen Explosionsschutzanordnung mit einem erfindungsgemäßen Explosionsschutzschrank.

The following description of a preferred embodiment is used in conjunction with the drawings for a more detailed explanation of the invention. Show it:

FIG. 1

a schematic perspective view of an embodiment of an explosion protection cabinet according to the invention;

FIG. 2

another perspective view of the explosion protection cabinet according to Figure 1;

FIG. 3

a view in the direction 3 of Figure 1;

FIG. 4

a side view in the direction 4 of Figure 1 and

FIG. 5

a schematic representation of an embodiment of an explosion protection arrangement according to the invention with an explosion protection cabinet according to the invention.

An embodiment of an explosion protection cabinet according to the invention, which is shown in FIGS. 1 to 4 and designated there as a whole by 10 is, comprises a receiving space 12, in which, for example, measuring arrangements or experimental equipment can be positioned. The recording room is opposite an interior 14 of a room 16 in which the explosion protection cabinet 10 is arranged gas-tightly closed (see Figure 5). Across from the free 18, the receiving space 12 is open to gas.

The explosion protection cabinet 10 has a bottom 20 with which the explosion protection cabinet 10 on a base 22 and in particular a floor the room 16 is placed. The bottom 20 is in this case 22nd fixed, for example by screwing. These are 20 folds at the bottom or profiles 24a, 24b arranged. These are in particular with the ground 20 welded. The folds 24a, 24b are then, for example, with the pad 22nd screwed via screw 26 (Figure 3). The folds 24a, 24b are thereby preferably arranged outside of the receiving space 12, so that the Floor 20 of the explosion protection cabinet 10 within the receiving space 12th does not have to be broken.

In the embodiment shown (Figure 2, Figure 3) are the folds 24a, 24b on opposite narrow sides of the explosion protection cabinet 10th arranged. It is also possible that they are on all sides of the Explosion protection cabinet 10 are arranged or at opposite longer pages.

The explosion protection cabinet 10 comprises opposite side walls 28, 30, between which the receiving space 12 is formed. In a preferred Embodiment, the explosion protection cabinet 10 has a rectangular Cross-section on. The side walls 28 are then perpendicular to the ground 22, wherein they are parallel to each other. The side walls 28, 30 are gas-tight connected to the ground 20.

The side walls 28, 30 are each gas-tightly connected to a front wall 32, wherein the front wall 32 is also gas-tightly connected to the bottom 20 is. The front wall 32 is perpendicular to the bottom 20 and perpendicular to the Side walls 28, 30.

On a cabinet top is a roof 34, each with the side walls 28th and 30 and the front wall 32 connected in a gastight manner. The roof 34 covers the Recording room 12 to the top of the cabinet down. The roof 34 is in particular designed as a pent roof with a rising inclination of the front wall 32 away. An inclination angle α is of the order of, for example 5 °.

To the interior 14 of the room 16 is the explosion protection cabinet over the Floor 20, the side walls 28, 30, the front wall 32 and the pent roof 34th closed gastight on all sides. The connection of the individual elements is for example made by welding.

On the front wall 32 opposite side 36 is the explosion protection cabinet 10 open.

In an outer wall 38 of the space 16, which the space 16 against the Limited outside 18, an outer wall opening 40 is formed. The explosion protection cabinet 10 is with its open side 36 at this outer wall opening 40 arranged so that a gas exchange with the free 18 can take place. The Outside wall opening 40 is designed so that no parts of the outer wall 38 protrude into the open side 36.

The explosion protection cabinet 10 is attached to the outer wall 38 at the outer wall opening 40 ago. Between the explosion protection cabinet 10 and the Inside (the space 16 side facing) of the outer wall 38 is a Seal 42 is arranged, in particular around the open side 36 of the explosion protection cabinet 10 is circumferential. Through this seal, the room is the 16th sealed gas-tight relative to the receiving space 12 to the open side 36.

The bottom 20 is screwed over the folds 24a, 24b with the base 22, that the explosion protection cabinet 10 is pressed against the seal 42 to to provide a seal.

Further, an angle plate 44 is provided, which with the inside of the Outside wall 38 is connected and connected to the roof 34. The connection (indicated in Figure 4 by the reference numeral 46) is configured so, that the roof 34 does not have to be broken and in particular no through holes are provided for screws or the like have to. About the angle plate 44 can be particularly in combination with the seal 42 and any other seals a seal the Cabinet top to reach the outer wall 38.

The area between the outer wall opening 40 and the open side 36 can be covered over in particular folded sheets 48 (Figure 3). The Sheets 48 are fixed to an outside of the outer wall 38.

The explosion protection cabinet 10 has on its open side 36 a first Cross bar 50 and a second cross bar 52. Below the first Cross bar 50 is in the direction of the bottom 20 is a non-closable Zuluftöffnung 54 formed. About this supply air opening 54 can constantly air in the Inlet space 12 flow. The supply air opening 54 is a protective grid 56 assigned, which is for example a louvred grille or a Perforated sheet is. This guard 56 is gas permeable; it serves to the supply air opening 54 a protection against the weather, dirt, To provide small animals, etc.

Above the second cross bar 52 is between this second cross bar 52 and the roof 34, a non-closable exhaust port 58 is formed. These Exhaust opening 58 extends into the highest area of the explosion protection cabinet 10, so that below the roof 34 no gas accumulation can form. Via the exhaust port 58 can be gas from the receiving space 12 dissipate. In combination with the supply air opening 54, a Gas exchange take place in the receiving space 12.

The exhaust port 58 is a protective grid 60, for example in the form of a Perforated sheet or a lamella associated.

Between the first cross bar 50 and the second cross bar 52 sits on the open side 36 a plurality of lightweight panels 62a, 62b, 62c. These serve to heat-isolate the receiving space 12 with respect to the outdoor 18. They also protect the receiving space 12 against the weather, Dirt, etc.

The lightweight panels 62a, 62b, 62c are loosely stacked. you will be for example, fixed to each other via adhesive tape 64 and also via adhesive tape fixed to the protective grids 56, 60.

The fixation is such that at a certain pressure in the receiving space 12 the lightweight panels 62a, 62b, 62c automatically fall out and release the open side 36.

For example, they are held so loose that they are at the overpressure of 10 mbar fall out into the open 18 and thus the front wall 32 opposite Release page 36 of the explosion protection cabinet 10.

In the receiving space 12, one or more transverse floors 66 are arranged (Figure 4). On such a transverse bottom 66 measuring devices, etc. be turned off.

According to the invention it is provided that a transverse bottom 66 with a plurality is provided by through recesses 68. For example, one is Transverse floor 66 formed by a perforated plate. This can be prevented that a gas accumulation can form below a transverse floor. It In particular, it is also provided that a transverse bottom 66 preferably at is flanged on all sides. This beading also helps that the Transverse floor 66 can carry loads under minimized deflection.

The side wall 28 is provided with a first door 70 and a second door 72. The two doors 70, 72 are removable as a whole. The door 70 and the door 72 each have a pair of spaced handles 74a, 74b on, where the respective door 70, 72 when removing or inserting can be held.

The doors 70, 72 are each provided with a window 76. The window 76 is made of a pressure-resistant and unbreakable material such as Lexan. (Lexan is a registered trademark of General Electric Co.)

The windows 76 are each embedded in a seal 78 (Figure 4). In the Seal 78 is in particular a rubber seal.

The doors 70, 72 are connected via a plurality of screw caps 80 with the Side wall 28 of the explosion protection cabinet 10 fixed. The screw caps 80 are evenly distributed near the side and front edges of the respective doors 70, 72 are arranged.

On the side wall 30 and the front wall 32 plate elements 82 are arranged, which are removable. With removed plate elements 82 and taken out doors 70, 72 can on the receiving space 12 of three Pages are accessed.

The plate members 82 are connected via screw caps as above with the doors 70, 72 mentioned on the front wall 32 and the side wall 30 fixable. The plate elements 82 sit on each one circumferential Seal 84 (Figure 2) on the associated wall 30 and 32. This is the gas-tightness of the receiving space 12 with respect to the interior 14 of the Room 16 ensured.

One or more of the plate members 82 may be formed as a media plate 84 be through the media such as gases and liquids in the recording room 12 are coupled and / or a medium from the receiving space 12th is decoupled and / or electrical lines in the receiving space 12th are feasible. About such electrical lines can be devices in the Supply the recording room 12 with energy, signals can be coupled in and signals can be dissipated.

For the supply or removal of media such as gases and liquids in and from the explosion protection cabinet 10 are corresponding to the media plates 84 Connecting elements 86 arranged over the corresponding Lines can be coupled. These are in particular bulkhead fittings, the through holes of pipes and hoses through the Seal media plates 84.

For electrical cables can be tested and suitable PG glands or similar cable glands used for a seal to care.

In one embodiment, the roof 34 is formed as a pent roof, which is free of crossbars and free of grease. At a length of 200 cm the pent roof rises 15 cm towards the open side 36. The side walls 28, 30 each have a length of 200 cm. Your height at the Front wall 32 is 185 cm and at the open side 36 200 cm. The Front wall 32 has a width of 110 cm and a height of 185 cm up.

The windows 76 in the doors have a size of 60 cm with a pane thickness of 4 mm.

The exhaust port 58 extends to the open side 36 to 15 cm after below. The supply air opening 54 extends at the open side 36 22 cm above.

As screw caps 80 90 ° turn locks are used.

In an upper area of the explosion protection cabinet 10 sits below the Badger 34 a gas sensor 88. In particular, it is a hydrogen-in-air sensor, which measures the hydrogen concentration, for example about heat of reaction. The gas sensor 88 is preferably located at a distance from the highest area of the receiving space 12 (i.e., spaced from the open space) Page 36).

In an explosion protection arrangement according to the invention, which schematically is shown in Figure 5, a further gas sensor 90 is provided, which outside the explosion protection cabinet 10 is arranged in the space 16. Preferably, the gas sensor 90 is located above the explosion protection cabinet 10. It can thereby be the gas concentration of a critical gas such Measure hydrogen outside the explosion-proof enclosure 10, in particular the tightness of the explosion protection cabinet 10 against the Inside 14 of the room 16 to be able to monitor constantly.

The gas sensors 88, 90 are connected to an emergency shut-off device indicated as a whole by 92 coupled. The critical gas is supplied via a feed 94 by a corresponding media plate 84 in the working space 12 of the explosion protection cabinet 10 coupled. In the feeder 94 sits a first Shut-off valve 96. In its "normal position" the check valve 96 locks (NC normally closed). A control device 98, which is connected to the gas sensor 90, opens the check valve 96 when the gas sensor 90 supplied data are "uncritical", d. H. if not critical Gas concentration is determined.

The check valve 96 is seated outside the space 16 so that upon detection of a critical concentration, the gas supply is locked in the room 16.

The gas sensor 88, which is arranged in the explosion protection cabinet 10, is coupled to a controller 100. This controls a check valve 102. The check valve 102 is normally closed (NC). Only if the detected by the gas sensor 88 concentration of the critical gas as uncritical is detected, the controller 100 opens the check valve 102, so that the gas can be coupled into the working space 12.

The two check valves 96 and 102 are connected in series, so that at Detection of a critical gas concentration by the gas sensor 88 or through the gas sensor 90, the gas supply into the explosion protection cabinet 10th is locked.

The explosion protection cabinet 10 is dimensioned so d. H. his recording room 12 has such a volume that during an emergency shutdown and blocking the gas supply even taking into account the in the pipes the supply 94 remaining gas volume, the explosion limit in the Recording room 12 is not reached. The emergency shutdown is done so early, that taking into account the volume of the receiving space 12 a critical limit is not reached. The dimensioning of the explosion protection cabinet 10 is thus such that the residual content is unproblematic.

A hydrogen-air mixture is available from a hydrogen concentration of approx. 4% flammable. In the solution according to the invention, it is provided, for example, that is warned at a measured concentration of 0.8% and is switched off at a measured concentration of 1.6% or higher.

The control devices 100 and 98 are connected to a shutdown device 104 coupled for the electrical power supply of the explosion protection cabinet 10. In the space 16, a control cabinet 106 is arranged, for example, via which devices in the receiving space 12 can be supplied with electrical energy are. The shutdown device 104 is coupled to the cabinet 106 and if at least one of the controllers 98 or 100 provides a critical signal, then the power supply of the cabinet 106 and thus also the power supply of the explosion protection cabinet 10th

The shutdown device 104 acts, for example, on an electromagnetic Sagittarius 108, which is open in the ground state, d. H. not switched (NO). If the shutdown device 104 reported no critical conditions then it closes the electromagnetic contactors, d. H. takes care of a switching, so that the cabinet 106 with electrical energy is supplied. Upon detection of a critical condition, the shutdown device provides 104 no signal to close the contactors 108, d. H. the Switching is canceled.

The explosion protection cabinet 10 according to the invention and the invention Explosion protection arrangements work as follows:

Through the explosion protection cabinet 10 is in the non-explosion-proof Room 16 an explosion-proof area divided. It is not necessary then to equip the entire room 16 with explosion protection.

In the explosion protection cabinet 10, measurements and experiments can be For example, carry out with hydrogen, being an active and passive Explosion protection is provided.

The (narrow) rear side of the explosion protection cabinet 10, which the front wall 32 is opposite, is open-walled. To all other sides is the Explosion protection cabinet 10 gas-tight closed. The open side 36 opens into the open 18. Compared to the interior 14 of the room 16 is characterized by a gas-tight Completion achieved during an air exchange and gas exchange with the free 18 on the open side 36 and in particular the supply air opening 54 and the exhaust port 58 can be made.

The explosion protection cabinet 10 is designed so that the plate elements 82, the doors 70, 72, the windows 76 and all seals an internal overpressure of at least 10 mbar. The cabinet construction itself is gas-tight at least up to an internal overpressure of 25 mbar. The lightweight components 62a, 62b, 62c are arranged so that they are at an inner Overpressure of 10 mbar fall out.

Through the exhaust port 58 and the supply air opening 54 can act as an active explosion protection measure a gas exchange take place. This can not be Accumulate gas concentrations in the receiving space 12. The gas exchange takes place with the free 18 and not with the interior 14 of the room 16th

About other measures such as inclination of the roof 34 and providing the transverse floors 66 with recesses 68 are gas accumulations within the Recording room 12 avoided. Furthermore (if, for example, hydrogen represents the critical gas) the exhaust port 58 directly below the roof 34th arranged. Hydrogen then flows in the direction of said roof 34 the exhaust port 58 and can then flow out of the receiving space 12.

By the gas sensor 88 in turn is a passive explosion protection measure provided; if a too high gas concentration is detected, then takes place via the Notabschalteinrichtung 92 an emergency shutdown to the to prevent further coupling of gas into the receiving space 12. Farther the electrical energy supply is switched off immediately.

The inventive solution can be relatively low Cost and relatively little technical effort an explosion protection area in a non-explosion protected room 16 provide.

Claims (55)

Explosion protection cabinet with a receiving space (12), which a gas permeable open side (36) and on all other sides (28, 30, 32, 34, 20) is closed gas-tight, with the open side into the Free (18) points. Explosion protection cabinet according to claim 1, characterized in that at least one opening (54, 58) is provided, which opens into the open air (18). Explosion protection cabinet according to claim 1 or 2, characterized in that the explosion protection cabinet is provided for positioning on an outer wall (38) with an outer wall opening (40). Explosion protection cabinet according to claim 3, characterized in that the outer wall opening (40) is so large that the open side (36) of the receiving space (12) is not covered. Explosion protection cabinet according to one of the preceding claims, characterized in that opposite side walls (28, 30) are provided. Explosion protection cabinet according to one of the preceding claims, characterized in that a front wall (32) is provided. Explosion protection cabinet according to claim 6, characterized in that the front wall (32) has a smaller width than an adjacent side wall (28; 30). Explosion protection cabinet according to claim 6 or 7, characterized in that the open side (36) of the front wall (32) opposite. Explosion protection cabinet according to one of the preceding claims, characterized in that a bottom (20) is provided. Explosion protection cabinet according to one of the preceding claims, characterized in that a roof (34) is provided. Explosion protection cabinet according to claim 10, characterized in that the roof (34) is designed as a pent roof. Explosion protection cabinet according to claim 10 or 11, characterized in that the roof (34) has a rising inclination towards the open side (36). Explosion protection cabinet according to one of the preceding claims, characterized in that the receiving space (12) on five sides (28, 30, 32, 34, 20) is closed in a gastight manner. Explosion protection cabinet according to claim 13, characterized in that opposite side walls (28, 30) are connected in a gastight manner to a base (20), a roof (34) and a front wall (32). Explosion protection cabinet according to one of the preceding claims, characterized in that a supply air opening (54) opening into the open is provided on the open side (36). Explosion protection cabinet according to claim 15, characterized in that the supply air opening (54) is arranged in the vicinity of a floor (20) of the explosion protection space. Explosion protection cabinet according to one of the preceding claims, characterized in that an exhaust air opening (58) opening into the open is provided on the open side (36). Explosion protection cabinet according to claim 17, characterized in that the exhaust air opening is arranged in a highest region of the explosion protection cabinet with respect to the direction of gravity. Explosion protection cabinet according to claim 17 or 18, characterized in that the exhaust air opening (58) is arranged on a roof (34) or in the vicinity of a roof (34). Explosion protection cabinet according to one of claims 2 to 19, characterized in that the at least one opening (54; 58) is assigned a gas-permeable protective grid (56; 60). Explosion protection cabinet according to one of the preceding claims, characterized in that the receiving space (12) on the open side (36) is partially covered with respect to the outside (18). Explosion protection cabinet according to claim 21, characterized in that at least one lightweight building board (62a, 62b, 62c) is arranged on the open side (36) between an inlet air opening (54) and an exhaust air opening (58). Explosion protection cabinet according to claim 22, characterized in that a plurality of stacked lightweight panels (62a, 62b, 62c) is provided. Explosion protection cabinet according to claim 22 or 23, characterized in that the at least one lightweight board (62a, 62b, 62c) is kept loose. Explosion protection cabinet according to one of claims 22 to 24, characterized in that the at least one lightweight panel (62a, 62b, 62c) is arranged so that it falls out at a predetermined overpressure in the receiving space (12). Explosion protection cabinet according to one of the preceding claims, characterized in that the explosion protection space is closed gas-tight on all sides except for a side (36) facing into the open (18). Explosion protection cabinet according to one of the preceding claims, characterized by a design for overpressure relative to the environment. Explosion protection cabinet according to one of the preceding claims, characterized in that the receiving space (12) is subdivided by means of at least one transverse floor (66) which has a plurality of through openings (68). Explosion protection cabinet according to one of the preceding claims, characterized in that at least one door (70; 72) is provided for providing access to the receiving space (12), which is removable as a whole. Explosion protection cabinet according to claim 29, characterized in that the at least one door (70; 72) is arranged on a side wall (28). Explosion-proof cabinet according to claim 29 or 30, characterized in that the at least one door (70; 72) can be fixed to the associated wall (28) with a plurality of rotary closures (80). Explosion protection cabinet according to one of the preceding claims, characterized in that at least one media plate (84) is provided, via which one or more media can be coupled into the receiving space and / or decoupled. Explosion protection cabinet according to claim 32, characterized in that the at least one media plate (84) is removable and by means of a plurality of screw caps (80) on the associated wall (30; 32) is fixable. Explosion protection cabinet according to claim 32 or 33, characterized in that the at least one media plate (84) is provided with one or more bulkhead fittings. Explosion protection cabinet according to one of the preceding claims, characterized in that a seal (42) is provided in the region of the open side (36) for engagement with an external wall (38) and / or an external bottom. Explosion protection cabinet according to one of the preceding claims, characterized in that an angle plate (44) for fixing a cabinet top side (34) to an external wall (38) is provided. Explosion protection cabinet according to one of the preceding claims, characterized in that at least one gas sensor (88) is arranged in the receiving space (12). Explosion protection cabinet according to claim 37, characterized in that the at least one gas sensor (88) is arranged in the vicinity of a cabinet top. Explosion protection cabinet according to one of the preceding claims, characterized in that the explosion protection cabinet is fixed with a base (22). Explosion protection cabinet according to one of the preceding claims, characterized in that the explosion protection cabinet is dimensioned in its volume so that in an emergency shutdown of a gas supply upon detection of a certain gas concentration, taking into account remaining in lines and in the receiving space a gas explosion limit is not reached. Explosion protection cabinet according to one of the preceding claims, characterized by a rectangular cross-section. Explosion protection cabinet according to one of the preceding claims, characterized in that removable plate elements (82, 84) are arranged on at least one wall (30; 32). Explosion protection cabinet according to one of the preceding claims, characterized in that at least one gas sensor (90) is arranged above the explosion protection cabinet (10) with respect to the direction of gravity. Explosion-proof cabinet according to one of the preceding claims, characterized in that an emergency shut-off device (92) is provided which shuts off the electrical supply upon detection of a specific gas concentration within the explosion protection cabinet (10) or outside the explosion protection cabinet (10) and the gas supply to the explosion protection cabinet (10). locks. Explosion protection arrangement in a room (16) with an outer wall (38), wherein the outer wall (38) has an outer wall opening (40), at which an explosion protection cabinet (10) according to one of preceding claims with its open side (36) is positioned. Explosion protection arrangement according to Claim 45, characterized in that the explosion-proof enclosure (10) is gas-tight with respect to the interior of the room (14). Explosion protection arrangement according to claim 45 or 46, characterized in that a seal (42) is provided between explosion protection cabinet (10) and outer wall (38) and / or a room floor. Explosion protection arrangement according to claim 47, characterized in that the seal (42) is circumferential. Explosion protection arrangement according to one of Claims 45 to 48, characterized in that at least one gas sensor (90) is arranged in the space (16). Explosion protection arrangement according to Claim 49, characterized in that the gas sensor (90) is coupled to a valve (96) via which the gas supply through the space (16) can be blocked. Explosion protection arrangement according to claim 50, characterized in that the valve (96) is designed as a check valve. Explosion protection arrangement according to one of claims 45 to 51, characterized in that in the receiving space (12) at least one gas sensor (88) is arranged, which is coupled to a valve (102) via which the gas supply to the explosion protection cabinet (10) can be blocked. Explosion protection arrangement according to claim 52, characterized in that the valve (102) is designed as a check valve. Explosion protection arrangement according to one of claims 50 to 52, characterized in that valves (96, 102), to which a gas sensor (90) in the space (16) and a gas sensor (88) in the explosion protection cabinet (10) is coupled, are arranged in series , Explosion protection arrangement according to one of claims 45 to 54, characterized in that an emergency shutdown device (92) is provided, by means of which the energy supply for the explosion protection cabinet (10) can be switched off as a function of measured gas concentrations.

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