Electrical device having a housing member

Abstract

The invention relates to an electrical device having a housing part, wherein first cooling ribs, second cooling ribs and third cooling ribs are molded or formed on the housing part, wherein the housing part has a wall, in particular a top side, and has two side walls, each cooling rib extending along the wall part and at least one of the side walls.

Description

Technical Field

[0001] The invention relates to an electrical device having a housing element. Background Art

[0002] It is known that cooling ribs improve the heat flow to be dissipated by convection from the housing part. Summary of the invention

[0003] It is therefore an object of the present invention to improve the heat output in an electrical device.

[0004] According to the invention, this object is achieved by an electrical device according to the features described below.

[0005] In an electrical device having a housing, an important feature of the present invention is that a first cooling rib, a second cooling rib and a third cooling rib are formed or molded on the housing.

[0006] The housing part has a wall, in particular a top side / ceiling, and two side walls.

[0007] Each of the cooling ribs extends along at least one of the wall portion and the side walls.

[0008] The advantage here is that the liquid cannot accumulate, so the heat flow will not be reduced due to the amount of accumulated liquid. In particular, according to the present invention, the heat flow can be conducted from the wall to the cooling ribs for dispersing the heat. By the thin design of the cooling ribs, a high dynamic change of the heat flow introduced into the wall is achieved. Because the heat flow is guided from the wall area to the side wall area by the cooling ribs and further guided to the thickened area of ​​the cooling ribs at the side wall area. In this way, a large heat capacity without heat transfer resistance can be achieved at the thickened area. Therefore, if a large heat flow is guided into the wall, it is quickly transferred to the thickened area of ​​the cooling ribs in the side wall via the cooling ribs.

[0009] By surrounding the housing part on two or three sides with corresponding cooling ribs, an air flow is driven by convection along the cooling ribs at different spatial positions of the housing part. In this way, heat dissipation can be effectively implemented at every spatial position.

[0010] The electrical device is preferably designed as a converter for feeding an electric machine. In this case, for example, during acceleration of the electric machine, high power is required for a short time, but this also leads to high heat loss power of the power electronics of the converter. The housing part designed according to the invention allows the heat flow to be quickly dissipated to thermal capacities remote from the inflow point, in particular to thickened areas of cooling ribs and / or webs.

[0011] In an advantageous embodiment, the first cooling ribs extend along the wall and the first side wall.

[0012] wherein the third cooling rib extends along the other side wall, in particular the second side wall and the wall portion,

[0013] The second cooling ribs extend along the wall and the two side walls. This has the advantage that each of the cooling ribs extends on at least two different, i.e. differently oriented walls. Each of the walls is designed to be substantially flat or at least oriented in a respective preferred spatial direction. Thus, each of the cooling ribs extends in at least two different spatial directions.

[0014] In an advantageous embodiment, the course of each of the first, second and third cooling ribs has at least one curved region. This has the advantage that a convectively driven air flow is formed in at least two different spatial orientations of the housing part. If the cooling ribs extend in only one plane, no convectively driven air flow can be formed transversely to the plane.

[0015] In an advantageous embodiment, the course of the first cooling ribs always has a non-positive radius of curvature.

[0016] The course of the third cooling rib always has a non-negative radius of curvature.

[0017] The course of the second cooling ribs has a positive radius of curvature in a first region and a negative radius of curvature in a second region,

[0018] In particular, the course is shown by the vertical projection of the respective top / apex of the cooling rib onto the surface of the housing part, in particular onto the respective side,

[0019] In particular, the top of the cooling ribs is the surface point farthest from the housing part in each case along the extension of the cooling ribs. The advantage here is that an air flow driven by convection can be formed in different spatial orientations of the housing part and the liquid can be discharged.

[0020] In an advantageous embodiment, the course of the first cooling ribs in the extension direction has an arc / arc segment with positive curvature.

[0021] In the extension direction, the third cooling rib has an arc with negative curvature.

[0022] wherein, in the extension direction, the course of the second cooling rib has an arc of positive curvature in the first region and an arc of negative curvature in the second region,

[0023] In particular, the course is the vertical projection of the cooling rib tips onto the surface of the housing part, in particular onto the respective side.

[0024] In particular, the top of the cooling ribs is the surface point farthest from the housing part in each case along the extension of the cooling ribs. The advantage here is that an air flow driven by convection can be formed in different spatial orientations of the housing part and the liquid can be discharged.

[0025] In an advantageous embodiment, on each of the side walls, a corresponding thickening of the wall thickness of the housing part, which acts as a web, connects in each case two cooling ribs that are adjacent to one another.

[0026] In particular, each of the cooling ribs is connected to at least one of the webs. This has the advantage that heat is conducted from the heat-generating element into the wall and the introduced heat flow is diffused by means of the cooling ribs to the high heat capacity formed by the webs. The heat flow thus flows into the heat capacity and from there is discharged in a uniform manner to the surroundings, in particular to an air flow flowing by convection, since the webs protrude less from the respective side wall than the cooling ribs.

[0027] In an advantageous embodiment, all the webs formed on the first side wall are at the same distance from the wall, and are in particular arranged colinearly with one another. This has the advantage that the air flow can flow uniformly through the webs.

[0028] In an advantageous embodiment, all the webs formed on the second side wall are arranged one behind the other in a straight line, in particular are spaced apart from one another only by the respective cooling ribs.

[0029] In particular, each of the webs has the same thickness and / or is shaped identically. Advantages here are that simple manufacturing can be achieved and that an effective circulation, in particular a laminar circulation, can be formed with the air flow driven in a convection manner.

[0030] In an advantageous embodiment, the wall thickness of the housing part in the region of the respective webs is smaller than the wall thickness of the housing part in the respective region of the cooling ribs adjacent to the respective webs. This has the advantage that, despite the presence of the webs, the air flow can be guided in the channels formed between the adjacent cooling ribs.

[0031] In an advantageous embodiment, the side wall is substantially perpendicular to the wall, in particular perpendicular to the top side. This has the advantage that an air flow driven by convection can be formed in different spatial orientations.

[0032] In an advantageous embodiment, in particular on the side walls, the wall thickness of the first, second and third cooling ribs increases monotonically, in particular strictly monotonically, with increasing distance from the wall. This has the advantage that an increased thermal capacity can be provided in the vicinity of the side walls. Thus, these thickenings together with the webs have the effect of increasing the thermal capacity.

[0033] In an advantageous embodiment, the wall thickness of the first cooling ribs, the second cooling ribs and the third cooling ribs in the region extending on the wall has a decreasing wall thickness with increasing distance from the wall.

[0034] wherein the wall thickness of the first cooling rib, the second cooling rib and the third cooling rib in the region where they extend on the first side wall decreases with increasing distance from the first side wall,

[0035] The wall thickness of the first cooling ribs, the second cooling ribs and the third cooling ribs in the region extending on the second side wall has a decreasing wall thickness as the distance from the second side wall increases. This has the advantage that the heat capacity is designed to increase closer to the side wall.

[0036] In an advantageous embodiment, the housing part is manufactured as a metal casting. This has the advantage that cost-effective and simple manufacturing can be achieved.

[0037] In an advantageous embodiment, the heat-generating components, in particular the modules with the controllable power semiconductors, are connected to the housing part in a heat-conducting manner on the inner side of the wall. This has the advantage that the components can be cooled in a simple manner. In particular, in highly dynamic operation, rapid absorption of heat can be achieved by diffusion and at the same time the heat can be discharged uniformly to the surroundings from the increased heat capacity of the webs and thickened cooling rib regions.

[0038] In an advantageous embodiment, the first side wall is oriented parallel to the second side wall.

[0039] The wall portion is oriented perpendicularly to the first side wall and the second side wall. This has the advantage that effective heat dissipation can be implemented in at least three different spatial orientations.

[0040] The present invention is not limited to the above-mentioned feature combinations. For a person skilled in the art, it is possible to derive other meaningful combinations of the above-mentioned feature combinations and / or individual features and / or description features and / or drawing features, especially from the purpose proposed and / or the purpose proposed by comparison with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The invention will now be explained in detail with the aid of a schematic diagram:

[0042] exist Figure 1 2 shows a housing part 5 of an electrical device having cooling ribs ( 1 , 2 , 3 ).

[0043] exist Figure 2 2 shows a cross section through a housing part 5 .

[0044] exist Figure 3 It is shown in Figure 2 A partial enlarged view of .

[0045] exist Figure 4 The individual spatial orientations of the housing part 5 are shown in FIG.

[0046] List of reference numerals:

[0047] 1 Cooling rib

[0048] 2 Cooling ribs

[0049] 3 Cooling ribs

[0050] 4 pieces

[0051] 5 Shell parts

[0052] 6 Thickened area

[0053] 20 connection surface DETAILED DESCRIPTION

[0054] As shown in the figure, the housing part 5 has cooling ribs (1, 2, 3).

[0055] In this case, the first cooling ribs 1 extend on a side wall and the top of the housing part 5 .

[0056] The second cooling ribs 2 extend on a side wall, the top side and the other side wall of the housing part 5 .

[0057] The third cooling ribs 3 extend on the other side wall and the top side of the housing part 5 .

[0058] The first cooling rib 1 does not extend in a straight line, but in a curved manner. Along its extension on the surface of the housing part 5 , the course of the first cooling rib 1 has an arc, in particular, the course ideally corresponds to a quarter circle arc. The arc is located on the upper side of the housing part 5 .

[0059] The second cooling rib 2 has a double arc along its extension on the surface of the housing part 5 , in particular on the top side, wherein a first arc of the double arc extends in an anti-curved manner relative to the second arc.

[0060] The third cooling rib 3 also does not extend in a straight line, but in a curved manner. The course of the third cooling rib 3 along its extension on the surface of the housing part 5 also has an arc, in particular, the course ideally corresponds to a quarter circle arc. This arc is also located on the upper side of the housing part 5, but is curved in the opposite direction to the arc of the course of the first cooling rib 1.

[0061] like Figure 1 As shown, two first cooling ribs 1 , two second cooling ribs 2 and four third cooling ribs 3 are formed on the housing part 5 .

[0062] On both side walls, the first cooling rib 1 , the second cooling rib 2 and the third cooling rib 3 each have a wall thickness which increases, in particular monotonically or even strictly monotonically, with increasing distance from the top side.

[0063] The heat-generating element, in particular a controllable semiconductor switch or a module having a controllable semiconductor switch, is located in the interior space surrounded by the housing part 5. In order to guide the heat flow of the heat-generating element, the housing part 5 has a finely machined surface, i.e., a connection surface 20, on its inner side, in particular on the upper side, in the center, against which the heat-generating element is pressed, in particular by screws or by spring elements. The heat flow thus flows centrally into the upper side, then spreads out from the upper side and is also guided into the cooling ribs (1, 2, 3).

[0064] Since the cooling ribs (1, 2, 3) are designed to be thinner on the top side, the temperature of the cooling ribs (1, 2, 3) follows the temperature changes of the heat-generating elements almost without a time delay and without significant differences or with constant differences.

[0065] This allows a dynamic diffusion of the heat flow. In the event of power fluctuations in the electrical device, in particular the converter, and thus heat flow fluctuations, the upper side absorbs the heat flow quickly. On the side walls, the cooling ribs are gradually thickened as the distance from the upper side increases. This results in an increased heat capacity, so that the heat can be discharged more evenly to the surroundings. The greater heat capacity in these areas prevents large dynamic fluctuations. However, the absorption capacity for thermal energy is much higher.

[0066] Furthermore, thickened portions are additionally formed on the two side walls, which act as webs 4 between the cooling ribs (1, 2, 3). In this case, two cooling ribs (1, 2, 3) that are adjacent to each other are connected by each web 4. The wall thickness of the housing part 5 in the region of the webs 4 is smaller than the wall thickness of the cooling ribs (1, 2, 3) in the region that is adjacent to the webs.

[0067] Preferably, the cooling ribs (1, 2, 3) are arranged equidistantly from one another on the side wall and have a minimum distance from the cooling ribs (1, 2, 3) that are immediately adjacent to each other. The cooling ribs (1, 2, 3) also maintain a minimum spacing from one another on the upper side. Thus, on the upper side, the cooling ribs extend parallel to one another at a minimum distance from the cooling ribs (1, 2, 3) that are immediately adjacent to them on the upper side, or the distance increases or decreases monotonically, but is always greater than the minimum distance.

[0068] The webs 4 are arranged collinearly, ie, in particular, on a straight line. Therefore, the webs 4 are all at the same distance from the upper side.

[0069] On the upper side of the housing part 5 , the wall thickness of the cooling ribs ( 1 , 2 , 3 ) is constant.

[0070] like Figure 4 As shown, water is discharged in a plurality of different spatial orientations of the housing part. Therefore, in these directions, water cannot accumulate in any area.

[0071] In a further embodiment according to the invention, the wall thickness of the cooling ribs (1, 2, 3) as a whole decreases monotonically or even strictly monotonically with increasing distance from the respective nearest side surface of the housing part 5. Nevertheless, the wall thickness of the first cooling rib 1, the second cooling rib 2 and the third cooling rib 3 on both side walls increases in particular monotonically or even strictly monotonically with increasing distance from the top side.

Claims

1. An electrical device having a housing member, in, The first cooling ribs, the second cooling ribs and the third cooling ribs are molded or formed on the housing member. The housing has a wall portion and two side walls. It is characterized in that Each cooling rib extends along at least one of the two side walls and the wall portion, On each of the two side walls, a corresponding thickening of the wall thickness of the housing part, which acts as a web, connects in each case two cooling ribs that are adjacent to one another. The wall thickness of the housing part in the region of the respective web is smaller than the wall thickness of the housing part in the respective region of the cooling rib adjoining the respective web.

2. The electrical device according to claim 1, characterized in that The wall portion is the upper side.

3. The electrical device according to claim 1 or 2, It is characterized in that A first cooling rib extends along the wall portion and a first side wall of the two side walls, The third cooling rib extends along the other side wall of the two side walls, namely the second side wall and the wall portion. The second cooling ribs extend along the wall portion and the two side walls.

4. The electrical device according to claim 1 or 2, It is characterized in that The course of each of the first cooling ribs, the second cooling ribs and the third cooling ribs has at least one curved region.

5. The electrical device according to claim 4, It is characterized in that The course of the first cooling ribs always has a non-positive radius of curvature. The course of the third cooling rib always has a non-negative radius of curvature. The course of the second cooling ribs has a positive radius of curvature in a first region and a negative radius of curvature in a second region, The course is the vertical projection of the respective top of the cooling rib onto the respective side of the housing part, In this case, along the extension of the cooling ribs, the top of the cooling ribs is in each case the surface point which is farthest from the housing part.

6. The electrical device according to claim 4, It is characterized in that In the extension direction, the first cooling rib has an arc with positive curvature. In the extension direction, the third cooling rib has an arc with negative curvature. wherein, in the extension direction, the course of the second cooling ribs has an arc of positive curvature in a first region and an arc of negative curvature in a second region, The direction is the vertical projection of the cooling rib tops on the respective side of the housing part, In this case, along the extension of the cooling ribs, the top of the cooling ribs is in each case the surface point which is farthest from the housing part.

7. The electrical device according to claim 1 or 2, It is characterized in that Each of the cooling ribs is connected to at least one of the webs.

8. The electrical device according to claim 1 or 2, It is characterized in that All webs formed on a first of the two side walls have the same distance from the wall. That is, they are arranged collinearly with each other.

9. The electrical device according to claim 1 or 2, It is characterized in that All the tabs formed on the second side wall of the two side walls are arranged successively along a straight line, All the webs formed on the second side wall are separated from one another only by the respective cooling ribs. In this case, each web has the same thickness and / or is shaped identically.

10. The electrical device according to claim 1 or 2, It is characterized in that The side walls are substantially perpendicular to the wall portion.

11. The electrical device according to claim 1 or 2, It is characterized in that On the side wall, the wall thicknesses of the first cooling ribs, the second cooling ribs and the third cooling ribs increase monotonically with increasing distance from the wall portion.

12. The electrical device according to claim 11, characterized in that On the side wall, the wall thickness of the first cooling ribs, the second cooling ribs and the third cooling ribs increases strictly monotonically with increasing distance from the wall.

13. The electrical device according to claim 1 or 2, It is characterized in that The wall thickness of the region where the first cooling ribs, the second cooling ribs and the third cooling ribs extend on the wall portion has a decreasing wall thickness as the distance from the wall portion increases, wherein the wall thickness of the region where the first cooling rib, the second cooling rib and the third cooling rib extend on the first side wall of the two side walls decreases as the distance from the first side wall increases, The wall thickness of the regions of the first cooling ribs, the second cooling ribs and the third cooling ribs extending on the second side wall of the two side walls decreases with increasing distance from the second side wall.

14. The electrical device according to claim 1 or 2, It is characterized in that The housing part is produced as a metal casting.

15. The electrical device according to claim 1 or 2, It is characterized in that A heat-generating component is connected to the housing part in a heat-conducting manner on the inner side of the wall.

16. The electrical device according to claim 15, characterized in that The heat-generating component is a module having controllable power semiconductors.

17. The electrical device according to claim 1 or 2, It is characterized in that A first side wall of the two side walls is parallel to a second side wall of the two side walls, Wherein, the wall portion is perpendicular to the first side wall and the second side wall.

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