CN212278628U - Housing cover and power electronic device - Google Patents
Housing cover and power electronic device Download PDFInfo
- Publication number
- CN212278628U CN212278628U CN202020767975.8U CN202020767975U CN212278628U CN 212278628 U CN212278628 U CN 212278628U CN 202020767975 U CN202020767975 U CN 202020767975U CN 212278628 U CN212278628 U CN 212278628U
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- China
- Prior art keywords
- housing
- housing cover
- reinforcement
- region
- holes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/14—Mounting supporting structure in casing or on frame or rack
- H05K7/1422—Printed circuit boards receptacles, e.g. stacked structures, electronic circuit modules or box like frames
- H05K7/1427—Housings
- H05K7/1432—Housings specially adapted for power drive units or power converters
Abstract
The utility model relates to a casing lid and power electronic equipment. The housing cover serves to create a closed housing chamber by means of a screw connection to a housing groove, in particular to a housing groove as housing of the power electronics. The housing cover has edge regions along several sides, in which a plurality of holes for screw connection to the housing groove are arranged, wherein the edge regions have a reinforcement along a first side of the several sides. In the region of the reinforcement, the material thickness of the housing cover is greater than in the edge regions of the remaining sides, wherein the material thickness in the region of the reinforcement is selected and the holes in the edge regions are designed such that, in the event of a predetermined maximum explosive load in the housing chamber, the housing cover screwed to the housing groove remains fastened to the housing chamber by means of a screw connection in the edge regions of the reinforcement and is released from the housing groove by tearing off the screw connection in the remaining edge regions. The power electronics device, for example an inverter, has such a housing cover.
Description
Technical Field
The utility model relates to a casing lid especially is used for power electronic equipment's casing lid. Furthermore, the invention also relates to a power electronic device with such a housing cover.
Background
In power electronic devices (for example inverters for converting input power supplied as direct current into output power supplied as alternating current), a possible explosion of components (for example capacitors or switching modules) may occur inside the housing of these devices, the possible explosion pressure of these components increasing with the ever increasing power density due to technological development. Since the current safety regulations for the housing design of such devices are still inadequate, accidents have been reported in which persons in the vicinity of the device are injured by flying housing parts released by the explosion.
Therefore, there is a solution to design the housing such that the housing parts do not come loose even upon explosion. In order to avoid the necessity of producing unnecessarily stable and therefore material-intensive housing shapes, it is advantageous to design the housing in such a way that, in the event of an explosion, the cover as the first housing part can be detached in a controlled manner from the groove (Wanne) as the second housing part, forming an outlet gap, whereby the explosion pressure can be discharged through the outlet gap.
For this purpose, document DE 202014100486 a1 proposes connecting the cover and the groove by means of a deformable fastening element having a closed ring, wherein the fastening element is screwed (versebauben) on opposite sections to the cover and the housing, respectively.
Alternatively, document DE 202015106657U 1 proposes that the housing body or the housing cover is enclosed at its fastening point with a depression such that a gap is formed between the housing body and the housing cover if the internal pressure in the housing exceeds a predetermined limit value.
However, it is also generally desirable for redesign and manufacture to modify existing types of housing covers with the least effort possible, so that complete detachment of the housing cover in the event of an explosion inside the housing (a predetermined explosive load acting on the cover) is avoided.
SUMMERY OF THE UTILITY MODEL
The object of the invention is therefore to provide a housing cover which can be produced cost-effectively and with low design effort and which remains securely fastened to the housing in the event of an explosion.
This object is achieved by a housing cover having the features described below. Preferred embodiments are also given below.
According to an aspect of the invention, a housing cover according to the invention is used for establishing a closed housing chamber by means of a screw connection with a housing groove, in particular with a housing groove as housing of a power electronic device, which housing cover has a plurality of sides with edge regions in which a plurality of holes for the screw connection with the housing groove are mounted. Along a first side of the plurality of sides, the edge region has a reinforcement, wherein the material thickness of the housing cover in the region of the reinforcement is greater than the material thickness in the edge region of the remaining sides. The material thickness in the region of the reinforcement is selected and the holes in the edge region are designed such that, in the event of a predetermined maximum explosive load in the housing chamber, the housing cover screwed to the housing groove remains fastened to the housing chamber by means of a screw connection in the edge region of the reinforcement and is released from the housing groove in the remaining region by means of a tear-off (Abrei β en) screw connection. Thereby, the edge region with the reinforcement (such as the hinge) acts to turn the housing cover under explosive load, so that the load can be quickly eliminated. Accordingly, the housing cover reliably remains firmly connected to the housing groove even under loads in which conventionally fastened covers come loose from the housing groove and are thrown out in a dangerous manner. Furthermore, the maximum explosive load that avoids complete loosening of the housing cover can be significantly increased compared to the embodiment of the cover according to the above-described prior art in which only a gap for eliminating pressure is formed.
At the same time, in the existing conventional configuration of the housing cover, only slight and cost-effective modifications are necessary to convert these configurations into the configuration of the housing cover according to the invention. In a preferred embodiment, the housing cover can be made of sheet metal. The metal sheet may be formed into a desired shape by deep drawing (Tiefziehen). Thus, the modification of the housing cover according to the invention from the conventional configuration of the housing cover of the existing type can be carried out without changing the tool set for deep drawing, which greatly reduces the redesign costs.
In order to simplify the threaded connection in the region of the tear-off remaining region and at the same time to be able to subject the threaded connection in the region of the reinforcement to load, the diameter of the hole in the region of the reinforcement can be set smaller than the diameter of the hole in the edge region of the remaining side. Alternatively or additionally, the number of holes in the region of the reinforcement can be selected to be greater than the number of holes in the edge regions of the remaining side faces, in particular also greater than the total number of holes in the remaining edge regions. In a preferred embodiment of the invention, the edge region of the side opposite the side with the reinforcement, possibly with the exception of the corners of the housing cover, has no holes. Hereby, a bowing of the housing cover in case of an explosion can be achieved
Whereby the disengagement behavior of the housing cover is improved.
Likewise, in order to simplify the tearing off of the screw connection in the remaining region, the material thickness in the region of the hole in the edge region of the remaining side faces can also be reduced compared to the material thickness of the housing cover outside the edge region. A possible solution to achieve this is that the area of the holes provided in the remaining area is reduced. Alternatively or additionally, the reduction of the material thickness in the region of the holes in the remaining regions can also be achieved by known measures of deep-drawing process design of the housing cover.
Advantageously, the reinforcement may be formed by applying a reinforcement strip. The reinforcing strip may be bonded to the housing cover with the aperture extending through the reinforcing strip. The reinforcing strip can be made of metal, in particular of the same material as the housing cover. Alternatively, however, the reinforcing strip can also be made of plastic or other sufficiently strong material. Also, composite materials can be envisaged.
Another possible solution, which is very cost-effective, consists in configuring the reinforcing element as a bent element (Falz). In this case, the housing cover is folded in the region of the reinforcement, so that a double fold is formed in this region and the material thickness in the region of the reinforcement is increased. The hole then extends through both bending layers. Alternatively, the reinforcing strip can be inserted into the fold, whereby no gluing of the reinforcing strip is necessary.
In another aspect of the invention, the power electronic device may have a housing cover according to the invention, which is fastened to the housing groove, in particular by a threaded connection, to form the housing chamber. The power electronics components are mounted inside a housing chamber, which is preferably formed hermetically to protect the components from the surrounding environment. Preferably, such power electronics can be configured as an inverter, for example as a solar inverter.
The present application also relates to the following aspects.
1) A housing cover for establishing a closed housing chamber by screwing with a housing groove,
the housing cover has edge regions along a plurality of sides, in which a plurality of holes for the screw connection to the housing channel are mounted, wherein along a first side of the plurality of sides the edge regions have a reinforcement, wherein the material thickness of the housing cover in the region of the reinforcement is greater than the material thickness in the edge regions of the remaining sides, wherein the material thickness in the region of the reinforcement is selected and the holes in the region of the reinforcement are designed such that, upon the occurrence of a predetermined maximum explosive load in the housing chamber, the housing cover screwed to the housing channel remains fastened to the housing chamber by the screw connection in the edge regions of the reinforcement and is released from the housing channel by tearing off the screw connection in the remaining edge regions.
2) The housing cover according to 1), characterized in that the housing slot is a housing of a power electronic device.
3) The housing cover according to 1) or 2), characterized in that the diameter of the holes in the region of the reinforcement is smaller than the diameter of the holes in the edge regions of the remaining sides.
4) The housing cover according to 1) or 2), characterized in that the number of holes in the region of the reinforcement is greater than the respective number of holes in the edge regions of the remaining sides.
5) The housing cover according to 3), characterized in that the number of holes in the region of the reinforcement is greater than the respective number of holes in the edge regions of the remaining sides.
6) The housing cover according to any one of 1) -2) and 5), characterized in that the material thickness in the region of the holes of the edge regions of the remaining sides is reduced compared to the material thickness of the housing cover outside the edge regions.
7) The housing cover according to 3), characterized in that the material thickness in the region of the holes of the edge regions of the remaining sides is reduced compared to the material thickness of the housing cover outside the edge regions.
8) The housing cover according to 4), characterized in that the material thickness in the region of the holes of the edge regions of the remaining sides is reduced compared to the material thickness of the housing cover outside the edge regions.
9) The housing cover according to any one of 1) -2), 5) and 7) -8), characterized in that the edge regions of the side opposite the first side, optionally except for the corners of the housing cover, have no holes.
10) The housing cover according to 3), characterized in that the edge regions of the side opposite the first side, optionally with the exception of the corners of the housing cover, have no holes.
11) The housing cover according to 4), characterized in that the edge regions of the side opposite the first side, optionally with the exception of the corners of the housing cover, have no holes.
12) The housing cover according to claim 6), characterized in that the edge regions of the side opposite the first side, optionally with the exception of the corners of the housing cover, have no holes.
13) The housing cover according to any one of 1) -2), 5), 7) -)8 and 10) -12), characterized in that the housing cover is manufactured from sheet metal.
14) The housing cover according to 3), characterized in that the housing cover is manufactured from sheet metal.
15) The housing cover according to 4), characterized in that the housing cover is made of sheet metal.
16) The housing cover according to 6), characterized in that the housing cover is manufactured from sheet metal.
17) The housing cover according to 9), characterized in that the housing cover is manufactured from sheet metal.
18) The housing cover according to 13), characterized in that the housing cover is manufactured from sheet metal by deep drawing.
19) Housing cover according to any one of claims 14) to 17), characterized in that the housing cover is manufactured from sheet metal by deep drawing.
20) The housing cover according to any one of 1) -2), 5), 7) -8), 10) -12) and 14) -18), characterized in that the reinforcement is formed by applying a reinforcement strip.
21) The housing cover according to 3), characterized in that the reinforcement is formed by applying a reinforcement strip.
22) The housing cover according to 4), characterized in that the reinforcement is formed by applying a reinforcement strip.
23) The housing cover according to 6), characterized in that the reinforcement is formed by applying a reinforcement strip.
24) The housing cover according to 9), characterized in that the reinforcement is formed by applying a reinforcement strip.
25) The housing cover according to 13), characterized in that the reinforcement is formed by applying a reinforcement strip.
26) The housing cover according to 19), characterized in that the reinforcement is formed by applying a reinforcement strip.
27) The housing cover according to any one of 1) -2), 5), 7) -8), 10) -12), 14) -18) and 21) -26), characterized in that the reinforcement is formed by a fold.
28) The housing cover according to 3), characterized in that the reinforcement is formed by a bent piece.
29) The housing cover according to 4), characterized in that the reinforcement is constituted by a bent piece.
30) The housing cover according to 6), characterized in that the reinforcement is constituted by a bent piece.
31) The housing cover according to 9), characterized in that the reinforcement is constituted by a bent piece.
32) The housing cover according to 13), characterized in that the reinforcement is constituted by a bent piece.
33) The housing cover according to 19), characterized in that the reinforcement is constituted by a bent piece.
34) The housing cover according to 20), characterized in that the reinforcement is constituted by a bent piece.
35) A power electronic device having a housing slot and a housing cover according to any one of 1) -34).
36) Power electronics device according to 35), characterized in that the power electronics device is designed as an inverter.
Drawings
The invention is explained below with the aid of the drawings, in which:
figure 1 shows a housing cover according to the invention in a top view and in a side view,
fig. 2 shows a detailed view of the housing cover according to the invention in three embodiment variants, an
Fig. 3 shows an inverter with a housing cover according to the invention.
Detailed Description
Fig. 1 shows an embodiment of a housing cover 10 according to the invention, in the upper region of the figure as a top view and in the lower region as a side view. The housing cover 10 is made of a sheet metal, for example made of aluminum or steel, which is deep-drawn to the desired shape. The housing cover 10 has four sides. Holes 12 are arranged in the edge regions 11 of three of the four sides, with which holes the housing cover 10 can be fastened by means of screw connections to the housing groove by means of insertion screws to form a closed housing chamber. The holes 12 in these edge regions are embodied and arranged in such a way that, by means of the inserted screws, the housing cover 10 can exert a desired pressing force on the groove, which pressing force acts in particular on a seal arranged between the housing cover 10 and the housing groove to form a sealed housing chamber.
Furthermore, the edge region 11 on the fourth side of the housing cover 10 is formed by a reinforcement 15. The reinforcement 15 has further holes 13, through which further screw connections of the housing cover 10 to the housing groove can be formed. The reinforcement 15 is characterized by a material thickness which is greater than the material thickness of the housing cover 10 in the region of the edge regions 11 of the remaining sides, in particular greater than the material thickness at the openings 12 arranged in these regions. Furthermore, the diameter of the holes 13 in the reinforcement 15 can be embodied smaller than the diameter of the holes 12 in the remaining edge region 11. This achieves that the force required for tearing the housing cover 10 off (heraussrei β en) from the screw connection of the bore 13 in the reinforcement 15 is significantly greater, preferably many times greater, than the force required for tearing the housing cover 10 off from the screw connection of the bore 12 in the remaining edge region. Furthermore, the holes 13 in the reinforcement 15 are preferably arranged more in each of the remaining lateral edge regions 11, preferably even more holes 13 than in all three remaining edge regions added together.
By the design and arrangement of the holes 12, 13 in the edge region 11, at a maximum predetermined load towards the housing cover 10 due to an explosion in the housing chamber, the threaded connection of the hole 12 is released by tearing apart, whereas the threaded connection of the hole 13 in the region of the reinforcement 15 is not released and the housing cover 10 can be held on the housing groove. In the event of such an explosion, the housing cover 10 is opened and the explosive load is effectively eliminated by releasing the pressure. The region of the reinforcement 15 thus acts like a hinge (Scharnier), wherein the hinge effect can be influenced in a targeted manner by a suitable shape design of the housing cover 10 in this region.
An improved elimination of the blast load can be achieved if the edge region 11 of the side of the housing cover 10 opposite the reinforcement 15 has no holes 12, or at least only holes in the corners of the housing cover 10. In the event of an explosion in the housing chamber, the housing cover 10 is thereby arched in the area without holes, so that the housing cover 10 can already be released from the housing groove before the screw connection is torn open. In addition, tearing off is simplified by this arching.
Fig. 2 shows different embodiments of the reinforcement 15 in sub-views a) to c). The detail view shown in fig. 2 corresponds to detail 14 of housing cover 10 shown in fig. 1.
In the first embodiment shown in sub-drawing a), the reinforcement 15 comprises a reinforcement strip 16, which reinforcement strip 16 is placed on the edge region 11 of the housing cover. The reinforcing strip 16 can be connected to the edge region 11 by gluing. The holes 13 extend through the reinforcing strips 16 and the edge region 11. The reinforcing strip is arranged on the side of the edge region 11 facing away from the housing groove.
Alternatively, as shown in sub-drawing c), the reinforcement can be formed by a fold 17 of the edge region 11. The material thickness of the reinforcement 15 is thus doubled in relation to the material thickness of the remaining housing cover 10. The hole 13 extends through both folded layers of the edge region 11.
Finally, as shown in detail b), the reinforcing strip 16 can be inserted between the two folded layers via the fold 17 of the edge region 11. Here, too, the hole 13 extends through the reinforcing strip 16 and the edge region 11.
Fig. 3 shows the inverter 1 as a power electronics device with a housing slot 18, in which the power electronics of the inverter 1 are arranged in a housing chamber. The housing cover 10 according to the present invention can be fastened to the housing groove 18 by screwing, and the housing chamber with the power electronic components can be hermetically closed. A further cover part (Abdeckung)19 is arranged next to the housing cover 10 for fastening on the housing slot. In the case shown, the cover 19 encloses a further housing chamber (for example, a connection region for cables) in which no components that can explode are arranged, so that the cover 19 can be implemented in a conventional manner. Meanwhile, the cover member 19 optically covers the edge area of the case cover 10 with the reinforcement. Alternatively, the cover piece 19 may also be provided as a housing cover or as a purely decorative cover piece according to the invention.
List of reference marks
1 inverter
10 casing cover
11 edge region
12 holes
13 holes
14 part of
15 reinforcing element
16 reinforcing bar
17 bending piece
18 casing groove
19 cover the lid.
Claims (13)
1. A housing cover (10) for establishing a closed housing chamber by screwing with a housing groove (18),
the housing cover (10) has edge regions (11) along a plurality of sides, in which a plurality of bores (12, 13) for the threaded connection with the housing channel are mounted, wherein along a first side of the plurality of sides the edge regions (11) have a reinforcement (15), wherein the material thickness of the housing cover (10) in the region of the reinforcement (15) is greater than in the edge regions (11) of the remaining sides, wherein the material thickness in the region of the reinforcement (15) is selected and the bores (13) in the region of the reinforcement (15) are designed such that, upon occurrence of a predetermined maximum explosive load in the housing chamber, the housing cover (10) screwed to the housing channel remains fastened on the housing chamber by means of the threaded connection in the edge regions (11) of the reinforcement (15), and is released from the housing groove in the remaining edge region by tearing off the screw connection.
2. The housing cover (10) according to claim 1, characterized in that the reinforcement (15) is formed by applying a reinforcement strip (16).
3. Housing cover (10) according to claim 1, characterized in that the reinforcement (15) is constituted by a bent piece (17).
4. The housing cover (10) of claim 1, wherein the housing slot (18) is a housing of a power electronic device.
5. Housing cover (10) according to one of claims 1 to 4, characterized in that the diameter of the holes (13) in the region of the reinforcement (15) is smaller than the diameter of the holes (12) in the edge regions (11) of the remaining sides.
6. Housing cover (10) according to one of claims 1 to 4, characterized in that the number of holes (13) in the region of the reinforcement (15) is greater than the number of respective holes (12) in the edge regions (11) of the remaining sides.
7. Housing cover (10) according to one of claims 1 to 4, characterized in that the material thickness in the region of the holes (12) of the edge region (11) of the remaining sides is reduced compared to the material thickness of the housing cover (10) outside the edge region (11).
8. Housing cover (10) according to any one of claims 1 to 4, characterized in that the edge region (11) of the side opposite the first side is free of holes.
9. The housing cover (10) as claimed in claim 8, characterized in that the edge regions (11) of the side opposite the first side have no holes except for the corners of the housing cover (10).
10. Housing cover (10) according to any one of claims 1 to 4, characterized in that it is manufactured from sheet metal.
11. The housing cover (10) according to claim 10, characterized in that it is manufactured from sheet metal by deep drawing.
12. A power electronic device characterized in that it has a housing slot (18) and a housing cover (10) according to any of claims 1-11.
13. Power electronic device according to claim 12, characterized in that it is designed as an inverter (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202020101874.4 | 2020-04-06 | ||
| DE202020101874.4U DE202020101874U1 (en) | 2020-04-06 | 2020-04-06 | Housing cover and power electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212278628U true CN212278628U (en) | 2021-01-01 |
Family
ID=73878662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020767975.8U Active CN212278628U (en) | 2020-04-06 | 2020-05-11 | Housing cover and power electronic device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN212278628U (en) |
| DE (1) | DE202020101874U1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021102511B4 (en) | 2021-02-03 | 2022-08-11 | Sma Solar Technology Ag | Explosion-proof housing |
| EP4210441A1 (en) * | 2022-01-11 | 2023-07-12 | Abb Schweiz Ag | Pressure relief of cabinet for electrical equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202014100486U1 (en) | 2014-02-04 | 2015-05-05 | Sma Solar Technology Ag | DEFORMABLE FASTENING ELEMENT AND INVERTER |
| DE202015106657U1 (en) | 2015-12-07 | 2017-03-08 | Sma Solar Technology Ag | Housing for receiving electronic components |
-
2020
- 2020-04-06 DE DE202020101874.4U patent/DE202020101874U1/en active Active
- 2020-05-11 CN CN202020767975.8U patent/CN212278628U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE202020101874U1 (en) | 2021-07-22 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |