HOUSING FOR AN ELECTRICAL DEVICE HAVING A COVER AND ELECTRICAL DEVICE HAVING A HOUSING

Abstract

The disclosure relates to a housing of an electrical device for converting electrical power, including a main body and a cover. The cover closes the main body to define a self-contained interior space, wherein electrical and electronic components of the electrical device are arranged in the interior space of the housing. The cover is connected to the main body via a detachable securing structure, which may be arranged in the geometrical center of the cover. An electrical device has a housing of this type.

Claims

1. Housing of an electrical device for converting electrical power, comprising: a main body that comprises a rear wall and side walls; a cover configured to close the main body to define a self-contained interior space of the housing, wherein the cover comprises a sealing surface that extends in one plane and by which the cover rests on rims of the side walls of the main body, wherein components of the electrical device are arranged in the self-contained interior space of the housing, wherein the cover is connected to the main body via a detachable securing structure that is arranged in a geometric center of the cover, wherein the detachable securing structure is screwable and comprises a nut or a screw with a screw head arranged on an outside of the cover, wherein the cover comprises a ductile metallic material that is configured to deform plastically and absorb energy by way of deformation in case of an interior overpressure so that a rapid pressure reduction occurs.

2. The housing according to claim 1, wherein the cover is secured to the main body solely by the centrally-arranged securing structure and lifts off from the rims of the side walls on one or more sides to achieve the rapid pressure reduction towards the one or more sides in the event of an interior overpressure.

3. The housing according to claim 1, wherein, between at least a portion of the rims of the side walls of the main body and the cover, a circumferential seal is arranged on which the securing structure exerts a pressure force via the cover so that the housing is closed to ensure a protection rating of the interior space of the housing of at least IP44 or of NEMA Type 4X.

4. The housing according to claim 1, wherein the main body comprises a crossmember which is secured to opposing points of the side walls of the main body, wherein a detachable connection between the cover and the crossmember is produced via the securing structure.

5. The housing according to claim 4, wherein the crossmember has a mating thread for the screw or an outward-facing threaded rod for the nut, respectively.

6. The housing according to claim 4, wherein the main body further comprises a front wall, and the front wall, rear wall and side walls comprise four main body side walls in a square or rectangular arrangement to form four corners, wherein the crossmember is arranged diagonally between two opposing corners of the main body side walls.

7. The housing according to claim 1, wherein the main body comprises a dome, which extends from the rear wall of the housing to the geometric center of the cover, wherein a detachable connection between the cover and the dome is produced via the screw or nut.

8. The housing according to claim 7, wherein the dome has a mating thread for the screw or an outward-facing threaded rod for the nut, respectively.

9. The housing according to claim 1, further comprising a stiffening plate arranged between the screw head or the nut and the cover in a frictionally-connected or integrally-bonded manner, wherein a diameter of the stiffening plate is between twice a diameter of the screw head or the nut and half a diameter or a width of the cover.

10. The housing according to claim 1, wherein the components in the interior space of the housing include switches, capacitors, or inductors that are configured to convert electrical power within the electrical device.

11. The housing according to claim 1, wherein the cover comprises an aluminum-magnesium alloy or a deep-drawn sheet steel so that the cover absorbs energy by way of deformation.

12. The housing according to claim 1, wherein an edge of the cover comprises a circumferential chamfer, wherein the edge of the cover is oriented in parallel with the side walls of the main body.

13. The housing according to claim 1, wherein the electrical device comprises a rectifier, an inverter, or a DC/DC converter and has an electrical rated power of at least one kilowatt.

14. The housing according to claim 1, wherein the ductile metallic material exhibits an elongation at break of >6%.

15. The electrical device according to claim 1, wherein the cover comprises an aluminum-magnesium alloy or a deep-drawn sheet steel so that the cover absorbs energy by way of deformation.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The disclosure will be explained and described further below with reference to example embodiments illustrated in the figures.

[0041] FIG. 1 shows a first embodiment of an apparatus according to the disclosure;

[0042] FIG. 2 shows a sectional view of a further embodiment of the apparatus according to the disclosure;

[0043] FIG. 3 shows a sectional view of a further embodiment of the apparatus according to the disclosure;

[0044] FIG. 4 shows a further embodiment of the apparatus according to the disclosure;

[0045] FIG. 5 shows a further embodiment of the apparatus according to the disclosure; and

[0046] FIG. 6 shows the dynamic behavior of an apparatus according to the disclosure.

DETAILED DESCRIPTION

[0047] FIG. 1 shows an electrical device 10 having a housing 11. The housing 11 comprises a main body 12. The main body 12 can be formed in one piece, e.g., as a die-cast molded part, or be comprised of several parts,for example, of a rear wall and side walls. In one embodiment, the main body can have a generally rectangular outline according to FIG. 1, such that it comprises four, generally planar, side walls, or can have a round or oval outline (not shown), such that it generally has one circumferential side wall.

[0048] The housing 11 comprises a cover 13. The main body 12 and the cover 13 together form, or otherwise define, a self-contained interior space of the housing 11 in that the cover 13 is placed on the rims of the side walls of the main body 12 in a frictionally-connected manner. In one embodiment, any openings in the side walls and/or the rear wall of the main body 12, e.g., for cable bushings, can themselves be designed to have suitable seals.

[0049] The cover 13 is detachably connected to the main body 12 by means of a central securing structure 14. According to one embodiment illustrated in FIG. 1, the securing structure 14 can be configured as a screw, the screw head of which is arranged on the outside of the cover 13 and which is screwed into a thread arranged in the interior space of the housing 11. Alternatively, further embodiments of the detachable securing structure 14 are conceivable, e.g., as a nut on a threaded rod protruding from the outside of the cover 13, as a locking plug-in connection, or the like. However, in one embodiment the securing structure 14 is the only securing mechanism by which a defined, permanently stable, and detachable connection between the main body 12 and the cover 13 is produced.

[0050] FIG. 2 shows a cross-section through a housing 11 together with parts of the main body 12in particular, the edge regions of the side wallsand a cover 13 according to one embodiment. A crossmember 15 is arranged between the side walls of the main body 12. The securing structure 14 establishes a detachable connection between the cover 13 and the crossmember 15, and thus to the main body 12. According to FIG. 2, the crossmember 15 can rest on a rim of the side wall of the main body 12 and be secured there, or can be connected to the side walls of the main body 12 in another form or manner-possibly, also detachably (cf. FIG. 4).

[0051] The force exerted by the securing structure 14 on the cover 13 is transmitted to the edges of the cover 13 via the surface of the cover 13. As a result, a seal 16 arranged between the cover 13 and the edges of the side walls of the main body 12 can be compressed and seal off the transition between the main body 12 and the cover 13. The resulting force acting on the seal 16 can, depending upon the design and field of application of the device 10, be selected such that the tightness of the housing 11 required in each case is achieved. In one embodiment, the resulting force on the seal 16 depends, among other things, upon the specific material properties of the coverin particular, its stiffnessand upon structural limitations of the securing structure, e.g., a thread length of the screw or of a comparable threaded rod. In the process, the material properties of the cover 13in particular, its stiffnessare to be designed such that the necessary compression force on the seal 16 is achieved.

[0052] According to FIG. 2, in one embodiment the seal 16 can be configured as a hollow chamber seal, which already achieves a good sealing action between the main body 12 and the cover 13 at small resulting forces. As a result, the housing 11 can have an overall protection rating of IP45 or higher.

[0053] In one embodiment, a stiffening plate 17, e.g., a washer, which can have a round or angular shape, can be arranged between the outer engagement point of the securing structure 14, i.e., the screw head according to FIG. 1, and the cover 13. Further spacers 18 can be arranged between the cover 13 and the crossmember 15, e.g., sealing rings or solid, screw-on blocks, which can specify a defined distance between the cover 13 and the crossmember 15 in the region of the stiffening plate 17. As an alternative to the crossmember 15, a dome 19 can be used (cf. FIG. 5).

[0054] In one embodiment, the cover 13 according to FIG. 2 has a generally planar shape having a circumferential chamfer and can be composed of a simple metal sheet that has been suitably shapedin particular, by means of a deep-drawing process.

[0055] FIG. 3 shows a cross-section through a further housing 11 according to another embodiment of the disclosure. Unlike the embodiment according to FIG. 2, the seal 16 in this case is made of solid material or of a foamed plastic. A seal of this kind may be easier to process and, overall, may be more compact than a hollow chamber seal according to the embodiment of FIG. 2. In addition, in one embodiment, stiffening struts 21 are arranged on the cover 13 according to FIG. 3; these increase the stiffness of the cover 13 and therefore ensure better transmission of the force, exerted by the securing structure 14 on the cover 13, to the edges of the cover 13 via the surface of the cover 13, and thus of the force exerted on the seal 16.

[0056] FIG. 4 is an illustration of a housing 11 according to another embodiment of the disclosure, having a main body 12 and an open cover 13. The cover 13 can be detachably connected to the crossmember 15 via a securing structure 14. A force exerted by the securing structure 14 on the cover 13 is transmitted, via the surface of the cover 13, to the edges of the cover 13, where it compresses a seal arranged between the cover and the edges of the side walls of the main body 12 (not shown). In this case, the cover 13 has a slightly convex shape, i.e., it bulges outwards when viewed from the interior space of the housing 11. This achieves better transmission of the force from the securing structure 14 to the seal.

[0057] According to FIG. 4, in one embodiment the crossmember 15 can be arranged diagonally between the upper corners of the main body 12 and can be connected to the side walls of the main body 12. Alternatively, in one embodiment the crossmember 15 can be spanned between any opposite points of the side walls, i.e., points whose connecting straight line extends through the geometric center of the opening of the main body 12, such that the securing structure 14 is arranged in the geometric center of the cover 13.

[0058] In one embodiment the crossmember 15 can be detachably connected to the side walls of the main body 12 or be rigidly attached thereto. The main body 12 can comprise further edge elements 20, e.g., guide aids for correctly positioning the cover 13 on the main body 12 or contact pins for producing equipotential bonding between the main body 12 and the cover 13. Here too, however, besides the securing structure 14, there are no further defined, permanently stable, and detachable connections provided between the main body 12 and the cover 13 in this embodiment.

[0059] FIG. 5 is a further illustration of a housing 11 according to another embodiment of the disclosure, having a main body 12 and an open cover 13. The main body has a centrally-arranged dome 19, which can be secured to the rear side of the main body 11 and extends to below, or even through, the geometric center of the cover 14. In one embodiment, the cover 13 can be detachably connected to the dome 19 via the securing structure 14. Specifically, the dome 19 can have a mating thread into which the securing structure 14 (in this case, for example, a screw) is screwed. Alternatively, the dome 19 can project beyond the cover 19 so that a securing structure 14 (in this case, for example, a nut) can be screwed onto the dome 19.

[0060] FIG. 6 shows a simulation of the plastic deformation of the cover 13 in the event of an explosion-like overpressure in the interior space of the electrical device 10. At time t=0 ms, the explosion-like pressure builds up (top left). At this time, the cover 13 rests on the rims of the side edges of the main body 11 and protects the interior space of the housing 11 from environmental influences. At time t=10 ms (top right), the cover 13 is deformed due to an overpressure inside and lifts off from the rims of the side edges 12 on all sides. This deformation continues slightly up to time t=20 ms and then comes to a stop once the overpressure in the interior space has been reduced. The cover 13 is then, at time t=40 ms, located in an end position (bottom right).