Explosion-proof housing for power electronics

Abstract

A housing (1) for power electronics comprises a pot (2) for receiving power electronics and a cover (3) for being placed onto the pot (2) so as to form a closed housing (1). The cover (3) is fixed to the pot (2) by means of a plurality of fixing screws (4). At least one opening element is provided, which is formed by one of the fixing screws (4), which is correspondingly guided through a sleeve (5) having a deformation (14.n), which is arranged between the screw head of the fixing screw (4) and the housing (1) so that a pressing force is exerted by the screw head through the sleeve (5) between the cover (3) and the pot (2). The deformation (14.n) is configured in such a way that the sleeve is compressed under the effect of an explosion force (5) of an over-pressing force in a manner defined by the deformation (14.n) so that a gap (11) of a predetermined width is formed between the cover (3) and the pot (2).

Description

Technical Field

[0001] The present invention relates to a housing for a power electronic device. The cover of the housing is secured in such a way that it is reliably held to the remainder of the housing body in the event of an explosion inside the housing. Background Technology

[0002] In power electronic devices, such as inverters that convert input power supplied as direct current into output power supplied as alternating current, the potential explosion of components, such as capacitors or power switching modules, can occur within the device's housing. The potential explosion pressure of these components increases with the continuously increasing power density due to technological advancements. Because inadequate safety regulations currently exist for designing the housings of such devices, accidents have been reported in which people near the device have been injured by flying portions of the housing that have detached due to the explosion.

[0003] Therefore, a solution exists whereby the casing is designed so that no casing part detaches during an explosion. To avoid the need for an unnecessarily stable and thus material-intensive casing shape, it is advantageous to design the casing such that the cover, as the first casing component, can be controlled to detach from the basin, as the second casing component, in the event of an explosion, thereby creating an outlet gap through which the explosion pressure can be released.

[0004] Therefore, document DE 20 2014 100 486 A1 proposes that the lid be connected to the basin by a deformable fixing element having a closed ring, wherein the fixing element is screwed to the lid and the shell in opposite sections. However, the fixing element requires a large structural space and is therefore only suitable for selected applications.

[0005] Alternatively, as proposed in document DE 20 2015 106 657 U1, the housing body or housing cover is surrounded by a recess at its fixing point such that a gap is formed between the housing body and the housing cover when the internal pressure in the housing exceeds a predetermined limit. This housing configuration is also limited by the chosen application and is particularly suitable for housing portions constructed from sheet metal by cold forming.

[0006] However, there is also a common expectation that an existing type of housing cover can be modified with the least possible cost for modification and manufacturing, so that the housing cover can be completely detached by a predetermined explosive load acting on the cover in the event of an explosion inside the housing. Summary of the Invention

[0007] Therefore, the object of the present invention is to provide a housing cover that can be manufactured at low cost and with minimal construction expense, and which reliably remains fixed to the housing in the event of an explosion.

[0008] This task is accomplished by means of a housing for power electronic devices according to the present invention. Preferred embodiments are given below.

[0009] In a first aspect, the present invention relates to a housing for a power electronic device. The housing includes a basin for receiving the power electronic device and a lid for mounting the basin, thus forming a closed housing. The lid is secured to the basin by means of a plurality of fixing bolts. At least one opening element is provided, which is constituted by one of the fixing bolts, and the fixing bolt is correspondingly guided through a sleeve having a deformable structure, the sleeve being arranged between the bolt head of the fixing bolt and the housing, thereby applying a clamping force between the lid and the basin by the bolt head through the sleeve. The sleeve is implemented in terms of material, material strength, and shape such that the clamping force applied for securing the lid to the basin does not cause major deformation of the sleeve. The deformable structure of the sleeve is configured such that, under the action of an explosive force of super-compression, for example by the explosion of the power electronic device, thereby triggering an overpressure inside the housing, the sleeve is compressed in a manner defined by the deformable structure, thereby forming a gap of a predetermined width between the lid and the basin.

[0010] In a preferred embodiment, the bolt head of the fixing bolt is located on the side of the basin opposite the lid. Preferably, the fixing bolt is threaded to the mating thread of the lid. The mating thread can be implemented as a blind thread, so that the threaded portion is not visible on the side of the lid opposite the basin. The blind thread can be cut directly into the material of the lid, or it can be fixed to the lid as a threaded sleeve on the basin side, for example, by pressing it in.

[0011] Overpressure can be released from the interior of the casing by creating a gap, wherein the lid is held securely to the basin. By compressing the sleeve during the explosive force, the connection between the fixing bolt and the mating thread is unloaded before the release of the overpressure determined by the explosion, thus preventing the basin and lid from detaching from each other due to the fixing bolt disengaging from the mating thread. The deformation structure introduced into the sleeve is a targeted weakening of the sleeve's mechanical stability, thereby providing sufficient mechanical stability to provide clamping force within the frame that assembles the lid onto the basin to its intended purpose, without major deformation of the sleeve. However, under greater explosive forces, the sleeve undergoes compressive deformation in a manner determined by the configuration of the deformation structure, wherein the compressive force required for deformation can be adjusted through the configuration of the deformation structure.

[0012] In a preferred embodiment of the invention, at least one additional braking element is provided on the housing. The additional braking element comprises a bolt and an additional sleeve with a deformable structure, wherein the bolt is guided through the additional sleeve. Here, the additional sleeve is arranged between the bolt head of the braking element's bolt and the housing such that the additional sleeve is only compressed in a manner defined by the deformable structure when the gap between the cover and the basin reaches a predetermined minimum width.

[0013] The housing of a power electronic device, consisting of a housing basin and a housing cover, serves two main functions. On the one hand, sufficient sealing must be ensured; on the other hand, explosion protection must be ensured in the event of damage. For sealing, it is therefore advantageous to apply the largest possible clamping force to the cover on the basin, provided by the fixing bolts. For explosion protection, it is advantageous for the opening element, consisting of the fixing bolts and a deformable sleeve, to open and create a gap at the earliest possible time, i.e., under the smallest possible explosion pressure within the housing. However, depending on the design of the power electronic device, such a large explosion pressure can also be generated in a short time, such that the energy absorption capacity of the sleeve of the opening element through compression is no longer sufficient to fully receive the explosion energy before the damage threshold is reached and the fixing bolts, for example, dislodge from the threads. However, increasing the size of the opening sleeve, for example, due to limited structural space, is generally technically impossible. In particular, arbitrarily increasing the sleeve length is not permitted. While this would result in a larger compression path for the sleeve and thus a greater energy absorption capacity, the opening gap would become too large, thereby exposing, for example, damaged but still energized parts.

[0014] By providing an additional braking element, the braking and absorption functions are essentially separated from the clamping and opening functions. Clamping force is also provided in the advantageous embodiment via the fixing bolts of the opening element. The sleeve of the opening element similarly achieves the formation of a gap between the cover and the basin. The energy absorption effect of the additional braking element is only used when a gap has been formed, thus allowing the housing to withstand significantly greater explosive pressures without reaching a damage threshold. The bolts and sleeves of the braking element are thus constructed and arranged such that the additional absorption capacity is only used from the predetermined minimum width of the gap. Therefore, rapid gap formation can be combined with high energy absorption as needed.

[0015] In a preferred embodiment, the bolt head of the additional braking element is arranged on the side of the basin opposite the cover, just like the fixing bolt of the opening element, and the thread of the bolt head preferably mates with the same type of mating thread of the cover, just like the fixing bolt. This particularly ensures the flexibility of explosion protection and opens up the possibility that the additional braking elements can be matched with the requirements of the housing in terms of quantity and shape. Arranging the additional braking elements in the existing threads of the housing particularly realizes a retrofit scheme for optimal explosion protection in existing devices.

[0016] In another preferred embodiment, the bolt head and the sleeve of the additional braking element are arranged at a distance from each other. This distance is selected according to a predetermined minimum width. Once a gap corresponding to the minimum width has been formed, the additional braking element thus provides its additional energy absorption capacity. The bolt head then contacts the initial area of ​​the additional sleeve and begins to transfer force from the bolt head to the sleeve. As the gap continues to open, before the internal explosive pressure has been eliminated, the sleeve is compressed and additional energy is absorbed through controlled mechanical deformation.

[0017] Furthermore, it can be considered that the bolt of the additional braking element has threads extending throughout the bolt shank. In this embodiment, the increased absorption effect is achieved through the engagement of the sleeve with the threads as the sleeve is increasingly compressed. Particularly preferred is that the sleeve of the additional braking element has a nearly linear force variation curve. This specifically means that the sleeve of the additional braking element generates an increasing force F when it is compressed with an increasing offset d, i.e., when the clearance is opened with an increasing force. This can thereby ensure that the sleeve has regions of different flexibility, which can be compressed with different forces.

[0018] In a preferred embodiment of the invention, the fixing bolt and the bolts for the optionally attached braking element are respectively arranged in the guide channel of the sleeve. This allows the bolt head to be guided during screwing and concealed for a uniform appearance of the housing. Furthermore, the guide channel can be used specifically to form a curve of variation of the reaction force provided by the deformation through the guide channel during compression of the sleeve. This can be achieved by selecting the cross-section of the channel in the sleeve region such that the sleeve deforming in the direction of compression contacts the sidewall of the guide channel. After contact with the sidewall, the sleeve can provide an increased reaction force to resist further deformation, thereby delaying complete compression of the sleeve. Subsequently, the sleeve can successfully withstand very high explosive forces without causing the bolt to disengage from the mating threads.

[0019] In another preferred embodiment, the sleeve is pre-formed such that it is held securely in place when assembled onto the bolt shank. This can be achieved by providing a flange pointing inwards on the side of the sleeve facing the bolt head, the flange engaging with a gradually narrowing section of the bolt shank. Similarly, the sleeve can be pre-formed such that it has a region with a gradually narrowing inner diameter in which it is elastically pressed into the threads after assembly onto the bolt.

[0020] Alternatively or supplementarily, the bolt may have a centering element arranged such that the sleeve is pressed against the bolt head in a position relative to the bolt's center. The centering element may be disposed directly on the head of the respective bolt as a conical attachment and may be made of, for example, plastic. This allows for better reproduction of the compression process by preventing sleeve tilting. The centering element may be provided not only in the fixing bolt but also in at least one bolt of an additional braking element.

[0021] Alternatively, the housing can be configured to secure the sleeve to the basin prior to screwing. For this purpose, the basin can have a corresponding retaining structure for the sleeve. It is also conceivable that the sleeve is implemented as a press-in sleeve, which is pressed into a suitable groove in the basin and thus secured before the housing is screwed in.

[0022] Alternatively, the basin can have a molding structure, the sleeve is mounted on the molding structure, and the molding structure is configured to determine the deformation of the sleeve under the action of an explosive force. Thus, the molding structure can, for example, have a conical region that, under the action of an explosive force, causes the sleeve to open or compress radially. In this way, the required force can be reduced to a suitable value, from which the deformation of the sleeve is caused. Alternatively or supplementarily, such a molding structure can also be arranged on the bolt head.

[0023] In an advantageous variant, the deformable structure can be configured as slits. The slits can extend longitudinally in the central region of the sleeve, thereby retaining tabs between the slits that deform outward under explosive force. Preferably, at least three slits are provided, thus creating at least three tabs. However, it is also conceivable to provide more than three slits. Similarly, it is conceivable to replace the longitudinally extending slits with slits having curved extensions. This configuration produces a torsional component during sleeve compression.

[0024] Instead of slits, deformable structures can also have other shapes and arrangements relative to each other, resulting in desired compression of the sleeve. For example, multiple holes can be arranged in the sleeve. Sleeves with varying degrees of flexibility along their extension can be constructed such that holes of different sizes or different hole spacings are provided in different regions of the sleeve, thereby retaining more or less material that must be compressed between the holes. The deformable structure can be manufactured independently of its arrangement or shape by removing sleeve material. Removal for forming the deformable structure can be carried out by laser cutting, but also by other known methods.

[0025] However, it is also possible to consider implementing the deformable structure as a pressed structure. The deformable structure is pressed using a suitable pressing punch without removing the sleeve material.

[0026] In another advantageous embodiment, to secure and lock the cover onto the basin, an opening element with a fixing bolt and a sleeve, and a braking element with a bolt and an additional sleeve, are arranged in an alternating sequence. Particularly advantageous here is that, in the case of a housing with a generally rectangular shape, the opening element is centrally arranged on the longitudinal side, and the additional braking element is arranged in the corner regions. This ensures that the arrangement achieves a sufficient distribution of explosive force, especially at the onset of an explosion, when typically only a single power electronic device explodes. In particular, the sleeves with varying degrees of flexibility in different regions can resist the formation of asymmetrical gaps. Attached Figure Description

[0027] The invention is described below with reference to the accompanying drawings, in which:

[0028] Figure 1a A first cross-section of the opening element of the housing in the screw region according to the invention is shown.

[0029] Figure 1b A first cross-section of the braking element of the housing in the screw region according to the invention is shown.

[0030] Figure 2a The diagram shows a second cross-section of the shell opening element in the screwed region after an explosion inside the shell, according to the invention.

[0031] Figure 2b The diagram shows a second cross-section of the braking element of the housing after an explosion within the housing in the screwed region, according to the invention.

[0032] Figure 3 A first view of the screw-in area of ​​the housing according to the invention is shown.

[0033] Figure 4A second view of the threaded region of the housing after an explosion inside the housing, according to the invention, is shown.

[0034] Figure 5 Three embodiments of a deformable sleeve for applications involving housing screwing are shown, and

[0035] Figure 6 The diagram shows a schematic variation of the force generated when the sleeves of the opening element and the braking element deform during an explosion inside the casing. Detailed Implementation

[0036] Figure 1a The diagram shows a cross-section of the opening element of a housing 1 of a power electronic device, such as an inverter, in the screwed region. The housing cover 3 is secured to the housing basin 2 by means of a retaining bolt 4 and pressed against a seal 6 arranged between the cover 3 and the basin 2. A clamping force is applied by means of the retaining bolt 4, which engages with the thread 7 of the cover 3. A sleeve 5 is arranged between the head of the retaining bolt 4 and the basin 2, the sleeve being fitted onto the bolt thread before screwing, so that the clamping force is applied to the basin 2 from the bolt head 4 of the retaining bolt through the sleeve 5. In this state, the sleeve 5 largely retains its original shape before screwing. Here, the sleeve 5 has a flange 12 on the side facing the basin 2. The housing 1 has one or more screwed portions serving as opening elements, which are located, for example, at the corners of the housing or centrally on the longitudinal side.

[0037] In one embodiment, the flange 12 is used to hold the sleeve 5 on the basin 2, for example by pressing it into the receiving portion in the basin 2, and the fixing bolt 4 is inserted through the sleeve 5 held on the basin 2 and screwed into the thread 7 of the cover 3.

[0038] exist Figure 1a In the state shown, the interior of housing 1 is completely sealed relative to the external environment, and the power electronics are ready to operate.

[0039] Figure 1b A cross-section of the housing 1 of the power electronics device is shown in the threaded region, where additional braking elements are arranged. The housing here is connected to... Figure 1a In the same sealed state, the bolt 4a of the braking element engages with the thread 7 of the cover 3 of the housing 1 through the opening of the basin 2. However, the fixation of the cover 3 to the basin 2 and the sealing by the sealing element 6 arranged between the cover 3 and the basin 2 are not provided by the bolt 4a of the braking element, but by another part of the cover, such as... Figure 1a One or more fixing bolts 4 are provided at the threaded connection as described in the text.

[0040] An additional sleeve 5a for the braking element is arranged between the head of bolt 4a and the basin 2, the additional sleeve being fitted onto the bolt thread before screwing. The bolt head of bolt 4a and sleeve 5a are arranged spaced apart from each other, so that no clamping force is applied to the basin 2 by the bolt head of bolt 4a through sleeve 5a. The distance between the bolt head of bolt 4a and sleeve 5a in this embodiment determines the minimum width of gap 11, which must be opened in an explosion situation before the energy absorption of the braking element is used by compressing sleeve 5a. A centering element 25 is arranged on the bolt head, the function of which is to bring sleeve 5a to a centered position relative to bolt 4a within the compression frame, thus making tilting of the sleeve impossible. The compression process can thus be better reproduced. The fixing element can also be arranged from Figure 1a Bolt 4 on the head.

[0041] Sleeve 5a also has a flange 12 on the side facing the basin. In the illustrated embodiment, the flange 12 is used to hold sleeve 5a on basin 2, which is also achieved, for example, by pressing it into a receiving portion in basin 2, as in the case of sleeve 5 of the opening element. Housing 1 may have a plurality of the aforementioned threaded portions serving as braking elements.

[0042] If like Figure 2a and 2b As shown, an explosion occurs inside the housing, for example, due to an overload of the power electronics arranged there. This creates overpressure inside the housing, which is transmitted to the retaining bolt 4 and the sleeve 5, which is arranged between the basin 2 and the bolt head, to open the element. Such a large force is applied to the sleeve 5 that it deforms and partially shrinks due to compression, thereby reducing the distance between the bolt head and the basin 2. This creates a gap 11 between the basin 2 and the cover 3, through which the overpressure can be released from inside the housing. This immediately reduces the force acting on the retaining bolt 4, so that the sleeve 5 shrinks only partially and maintains the connection between the retaining bolt 4 and the cover 3, and the cover 3 remains held on the basin 2. When the gap 11 is opened to a minimum width determined by the distance between the bolt head of the bolt 4a and the sleeve 5a of the braking element, the bolt head of the bolt 4a eliminates the distance from the sleeve 5a and begins to additionally transmit force to the sleeve 5a of the braking element. The sleeve 5a is now also compressed, which results in a further reduction in the force acting on the retaining bolt 4. This improves the shell's ability to withstand greater explosion pressure.

[0043] The width of the resulting gap 11 can be predetermined by the configuration of the sleeves 5 and 5a such that it cannot interfere with the interior of the housing after an explosion. This results in improved device safety, as dangerous voltages can be applied inside the housing 1 after an explosion, thus requiring contact protection. The configuration of the sleeves 5 and 5a for the opening and braking elements can involve the number, size, material selection, and shape of the sleeves 5 and 5a. The shape can also include, in particular, the provision of deformable structures on the sleeves. For example, holes or slits can be provided by means of removal methods, or by changing the local thickness of the sleeves through pressing. The deformable structure is used to define a threshold force from which the sleeve shrinks under compressive force and affects the deformation of the sleeve during shrinkage. Preferably, the threshold force is at least 20% greater than the maximum force acting on the sleeve during housing bolting, and at least 50% greater in an advantageous embodiment, thereby effectively preventing the sleeve from shrinking when using the maximum permissible torque acting on the bolt.

[0044] exist Figure 3 The image shows a first view of the threaded area of ​​the housing 1 in an advantageous embodiment. Here, the retaining bolt 4 is arranged in a guide channel 10, which visually conceals the retaining bolt 4 and ensures lateral guidance of the retaining bolt 4, particularly the bolt head. The bolt 4a of the braking element is also advantageously arranged in such a guide channel 10. This provides resistance to tilting of the threaded portion not only during the threading itself but also in the event of an explosion. Figure 3 The guide channel 10 is shown in cross-sectional view, wherein, possibly, the guide channel 10 is implemented in the form shown by cutting.

[0045] As in Figure 4 As shown, in the event of an explosion, the explosion pressure from the housing 1 can be released from the gap 11 formed by the deformation of the sleeve 5 of the opening element. The sleeve 5 can here shrink to such an extent that it contacts the inner wall of the guide channel 10. This increases the reaction force of the sleeve 5 against further deformation, thereby maintaining the connection between the fixing bolt 4 and the cover 3 until a greater explosion force is encountered compared to the absence of such contact.

[0046] exist Figure 5 Some exemplary embodiments of sleeves 5.1 to 5.3 are shown, for example, sleeves that can be used within the framework of the present invention. In a first embodiment, sleeve 5.1 has a deformable structure 14.1 in the form of a plurality of slits, with tabs retained between the slits. When sleeve 5 shrinks, the tabs bend outward in the radial direction.

[0047] In the second embodiment, the sleeve 5.2 has a deformable structure in the form of holes distributed on the sleeve surface. A network of tabs is retained between the holes. This network is compressed under the influence of explosive force. In particular, one embodiment with the hole distribution can advantageously modify the sleeve 5a to achieve different flexible regions of the sleeve 5a, which are compressed under different forces. In particular, it is possible to achieve an increased reaction force on the sleeve when it is compressed more, by providing different, particularly smaller, diameter holes on the extension of the sleeve, so that in the case of larger holes, narrower tabs are arranged between the holes, which can deform under less force, and in the case of smaller holes, wider tabs are arranged between the holes, which can deform under greater force.

[0048] Different compression characteristics can also be achieved by combining different types of deformation structures.

[0049] In the third embodiment, a cross-sectional view shows the anti-loss arrangement of the sleeve 5.3 on the fixing bolt 4. The inwardly pointing bend of the sleeve mates with the narrowed portion 13 of the bolt shank, thereby preventing the sleeve from being lost and holding it securely to the shank. This arrangement results in a simplified and more reliable assembly of the housing 1. Anti-loss can also be achieved in another way through suitable shaping of the sleeves 5, 5a and / or the fixing bolts / bolts 4, 4a.

[0050] Figure 6The force F variation curve 15 is shown, which causes compression of the sleeve 5, used in the opening element of the housing according to the invention, by an offset d. In the fixed region 18 followed when the housing is screwed in with the fixing bolt 4, the sleeve 5 does not deform or deforms only slightly by an offset. The torque used during assembly of the fixing bolt 4 results in a force F corresponding to the initial point 16 on the variation curve 15. When an explosive force acts on the sleeve 5, significantly exceeding the force F at the initial point 16, the sleeve 5 transitions into the deformation region 19, shrinks, and the sleeve produces an offset d while simultaneously forming a gap 11 between the cover 3 and the basin 2 of the housing 1. The overpressure from the explosion can be released through the gap 11, thereby immediately reducing the explosive force, and thus the sleeve 5 moves to the endpoint 17 on the force variation curve 15. The offset d corresponding to the endpoint 17 is here less than the offset d corresponding to complete shrinkage 20, which defines the end of the deformation region 19. The force F increases abruptly at the end of the deformation zone 19, posing a risk that the fixing bolt 4 may dislodge from the threads of the cover 3 and the cover 3 may detach from the basin 2. The sleeve 5 is preferably designed in such a configuration that the endpoint 17 is also at a sufficient distance from the end of the deformation zone 19 under the maximum explosive force to be considered, i.e., the sleeve 5 does not completely shrink and thereby unloads the thread 7, preventing the fixing bolt 4 from dislodging from the thread. When the pressure variation curve is known, for example, from preliminary tests, the configuration can be designed by calculation, for example, using the finite element method. Alternatively or additionally, the configuration of the sleeve 5 can be determined or optimized through a series of tests with different explosive forces.

[0051] In cases where the explosive force cannot be reduced to a non-hazardous level through the aforementioned functional methods, the use of additional braking elements is advantageous. Figure 6 The diagram also shows the force variation curve 21 (dashed curve), which causes compression of the sleeve 5a in the braking element used in the housing according to the invention by an offset d. According to the invention, compression of the sleeve 5a is introduced only when the gap 11 has been opened to its minimum width 22. The sleeve 5a also transitions into its deformation region 19. The force variation curve 21 is advantageously linear in the sense that as the gap is opened larger, the sleeve 5a is gradually compressed by an additional offset d, resulting in an increased reaction force. This can be achieved by the aforementioned advantageous configuration of the sleeve's deformation structure. Here, the endpoint 23 of the deformation region 19 should also be chosen such that the offset d corresponding to the endpoint 23 is less than the offset d corresponding to the complete contraction 24, at which the force F increases sharply. With the total reaction force of the cover 3 plus the reaction forces of the sleeves 5 and 5a, the housing 1 can withstand a greater explosion force, or can better reduce the overpressure caused by the explosion of the device.

[0052] List of reference numerals

[0053]

Claims

1. A housing (1) for a power electronic device, comprising: - A basin (2) for receiving power electronic devices; - A lid (3) for mounting onto the basin (2), thereby forming a closed housing (1), wherein the lid (3) is fixed to the basin (2) by means of a plurality of fixing bolts (4). Its features are, At least one opening element is provided, wherein the opening element is constituted by one of the plurality of fixing bolts (4), which is correspondingly guided through an opening sleeve (5) having a deformable structure (14.n), the opening sleeve being arranged between the bolt head of the fixing bolt (4) and the housing (1), thereby applying a clamping force between the cover (3) and the basin (2) by the bolt head of the fixing bolt (4) through the opening sleeve (5), wherein the deformable structure (14.n) is configured such that the opening sleeve (5) is compressed in a manner defined by the deformable structure (14.n) under the action of an explosive force exceeding the clamping force. The gap (11) of a predetermined width is formed between the cover (3) and the basin (2), wherein at least one additional braking element is provided, wherein the at least one additional braking element comprises a bolt (4a) and an additional sleeve (5a) having a deformable structure (14.n), wherein the bolt (4a) is guided through the additional sleeve (5a), wherein the additional sleeve (5a) is arranged between the bolt head of the bolt (4a) and the housing (1) such that the additional sleeve (5a) can be compressed from the predetermined minimum width of the gap (11) in a manner defined by the deformable structure (14.n).

2. The housing (1) according to claim 1, wherein, The bolt head and the additional sleeve (5a) of the additional braking element are arranged at a distance from each other, wherein the distance is selected according to the predetermined minimum width.

3. The housing (1) according to claim 2, wherein, The bolt (4a) of the additional braking element has a continuous thread extending throughout the bolt shank.

4. The housing (1) according to any one of claims 1 to 3, wherein, The fixing bolt (4) and the bolt (4a) of the additional braking element are arranged on the side of the basin (2) opposite to the cover (3).

5. The housing (1) according to claim 4, wherein, The fixing bolt (4) and the bolt (4a) of the additional braking element are screwed into the thread (7) of the cover (3).

6. The housing (1) according to claim 4, wherein, The fixing bolt (4) and the bolt (4a) of the additional braking element are respectively arranged on the guide channel of the basin (2).

7. The housing (1) according to claim 6, wherein, The cross section of the guide channel (10) in the region of the open sleeve (5) is selected such that the compressed open sleeve (5) contacts the guide channel (10).

8. The housing (1) according to any one of claims 1 to 3, wherein, Each of the plurality of fixing bolts (4) is guided through an open sleeve (5) having a deformable structure (14.n).

9. The housing (1) according to any one of claims 1 to 3, wherein, The opening sleeve (5) of the opening element and the additional sleeve (5a) of the additional braking element are pre-formed so that the sleeve is held securely when assembled onto the rod of the bolt (4a) / fixing bolt (4).

10. The housing (1) according to any one of claims 1 to 3, wherein, The opening sleeve (5) and the additional sleeve (5a) are implemented as press-in sleeves located on the basin (2) before screwing.

11. The housing (1) according to any one of claims 1 to 3, wherein, The basin (2) has a molding structure, the opening sleeve (5) and the additional sleeve (5a) are mounted on the molding structure, and the molding structure is configured to determine the deformation of the opening sleeve (5) and the additional sleeve (5a) under the action of the explosive force.

12. The housing (1) according to any one of claims 1 to 3, wherein, The deformable structure (14.n) is at least partially constructed as a slit.

13. The housing (1) according to any one of claims 1 to 3, wherein, The open sleeve (5) and the additional sleeve (5a) have at least three longitudinally extending slits.

14. The housing (1) according to any one of claims 1 to 3, wherein, The deformable structure (14.n) is at least partially constructed as a hole.

15. The housing (1) according to any one of claims 1 to 3, wherein, The deformable structure (14.n) is manufactured by removing the sleeve material.

16. The housing (1) according to any one of claims 1 to 3, wherein, The deformable structure (14.n) is implemented as a pressing structure.

17. The housing (1) according to any one of claims 1 to 3, wherein, To secure and lock the lid onto the basin, an opening element and a braking element are arranged in an alternating sequence along the periphery of the housing. The opening element includes a fixing bolt (4) and an opening sleeve (5), and the braking element includes a bolt (4a) and an additional sleeve (5a).

18. The housing (1) according to claim 17, wherein, The housing (1) has a basic rectangular shape, wherein the opening element is centrally arranged on the longitudinal side, and the additional braking element is arranged in the corner region.

19. The housing (1) according to any one of claims 1 to 3, wherein, The deformed structure (14.n) of the additional sleeve (5a) of the additional braking element is constructed more flexibly in the initial region of the deformed structure facing the bolt head compared to the rest of the region of the additional sleeve (5a).

20. The housing (1) according to any one of claims 1 to 3, wherein, At least one of the plurality of fixing bolts (4) and / or the bolt (4a) has a centering element (25) to centerfully press the opening sleeve (5) and / or the additional sleeve (5a) onto the bolt head.

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