Electrical device

Abstract

An electrical device having a sheet-metal housing and a fan, the fan having a fan housing that is clip-connected to the sheet-metal housing and has a pivot pin that is inclined against a pivot axis coaxially oriented with respect to an edge of the sheet-metal housing such that the fan can be pivoted relative to the sheet-metal housing.

Description

[0001] electrical appliance

[0002] Description:

[0003] The invention relates to an electrical device.

[0004] It is generally known that an electrical device has a heat-generating component, such as a power semiconductor, which is connected to a heat sink for heat dissipation.

[0005] The invention is therefore based on the object of developing an electrical device which is to enable simple manufacture and / or maintenance.

[0006] According to the invention, the object is achieved in the electrical device according to the features specified in claim 1.

[0007] Important features of the electrical device, especially converter or inverter, with a sheet metal housing and a fan are that the fan has a fan housing,

[0008] - which is clip-connected to the sheet metal housing and

[0009] - which has a pivot pin which is positioned against an edge of the sheet metal housing acting as a pivot axis and / or which is positioned against a pivot axis aligned coaxially with an edge of the sheet metal housing for pivoting the fan relative to the sheet metal housing, in particular which is positioned against a rotation axis aligned coaxially with an edge of the sheet metal housing for rotating the fan relative to the sheet metal housing, in particular wherein the pivoting, in particular rotation, of the fan housing is blocked by the clip connection between the fan housing and the sheet metal housing and / or can be carried out after loosening the clip connection between the fan housing and the sheet metal housing. The advantage here is that the fan can be easily connected to the sheet metal housing or separated from the sheet metal housing. The electrical device can therefore also be operated without the fan.Optionally, the fan can be clipped on, providing more efficient heat dissipation. The connection process essentially consists of two steps: first, placing the fan housing against the sheet metal edge and then pivoting it around the rotation axis until it is clipped in place. During this connection, an electrical connector can also be added, allowing the fan's electric motor to be powered.

[0010] In an advantageous embodiment, the pivot pin is L-shaped, with the edge of the sheet metal housing positioned against the inner corner of the L. The advantage here is that a pivot joint can be implemented simply and cost-effectively.

[0011] In an advantageous embodiment, a locking lug is formed on the fan housing, which is clipped into a recess or depression in the sheet metal housing, in particular wherein the locking lug is spaced from the pivot pin and / or wherein the locking lug protrudes in the opposite direction to the pivot pin on the fan housing. Advantageously, the locking lug is formed integrally on the fan housing, thus providing a secure and resilient clip connection.

[0012] In an advantageous embodiment, guide pins are formed on the fan housing, which guide the fan housing at least when releasing or closing the clip connection. This is advantageous because tilting during clipping is prevented, thus making the connection easy and trouble-free.

[0013] In an advantageous embodiment, the fan housing, including the pivot pin, guide pin, and / or locking lug, is designed as a plastic injection-molded part, in particular as a single piece and / or one-piece. This allows for simple, cost-effective production.

[0014] In an advantageous embodiment, the fan housing has a receiving area for a fan impeller driven by an electric motor and a constricted area such that the air flow conveyed by the fan impeller is constricted as it passes through the constricted area, thus increasing its average flow velocity. This is advantageous in that the air flow enters the interior space enclosed by the sheet metal housing at an increased speed, thus achieving high cooling performance.

[0015] In an advantageous embodiment, the constricted area is rounded in such a way that the air flow flowing through the constricted area is deflected by 90° out of the fan in a direction perpendicular to the rotation axis of the fan impeller and flows through the front grille openings of the sheet metal housing, particularly those facing the fan, into the interior of the electrical device, in particular into the interior area enclosed by the sheet metal housing. This is advantageous because only a flat structure on the sheet metal housing is required.

[0016] In an advantageous embodiment, the sheet metal housing has additional grille openings arranged laterally on the electrical device, through which the air flow through the electrical device draws in an additional air flow, in particular this air flow thus increasing the volume flow and also cooling laterally arranged waste heat sources of the electrical device, as well as the sheet metal housing, in particular wherein third grille openings are arranged on the side of the electrical device opposite the fan, through which the entire air flow exits. The advantage here is that the air flow conveyed by the fan impeller flows through the interior space enclosed by the sheet metal housing and draws in a lateral inflow, so that a high cooling capacity can be achieved.For this purpose, the essentially cuboid-shaped sheet metal housing has grille openings on at least three of its six sides, so that air flows in through two of the sides and out through the third. The second side is adjacent to the first side. In particular, the third side is arranged opposite the first side.

[0017] In an advantageous embodiment, the fan shroud is shaped such that the flow cross-section in the constricted region decreases monotonically with increasing distance from the fan impeller, in particular wherein initially a width of the interior region of the fan made available to the air flow by the fan shroud becomes monotonically smaller and then a height of the interior region of the fan made available to the air flow by the fan shroud becomes increasingly smaller, in particular wherein the width is measured in a direction parallel to the nearest surface of the sheet metal housing and the height is measured in a direction parallel to the normal direction of the nearest, in particular flat, surface. The advantage here is that the air flow is initially constricted in a first direction and then in a second direction perpendicular to the first direction. The constriction therefore does not occur isotropically perpendicular to the flow direction, but rather anisotropically perpendicular to the flow direction with a time shift.

[0018] In an advantageous embodiment, the electrical device, in particular a converter or inverter, comprises power electronics, in particular a power section, and signal electronics, in particular a control section, wherein the power electronics comprises a sheet metal housing which, together with a cover, forms a housing, wherein the signal electronics comprises a signal electronics housing which is placed on the power electronics, wherein the cover has a connecting tab through which a mating connector part of the power electronics protrudes, wherein a connector part of the signal electronics is connected to the mating connector part, wherein a guide groove is formed in the cover, in particular wherein the guide groove extends parallel to the plug connection direction, wherein a guide rib formed on an inner side of the signal electronics housing protrudes into the guide groove and / or is guided by it,wherein at least one first centering dome is arranged on the sheet metal housing and projects towards the signal electronics housing, wherein a screw projects through the centering dome, which also projects through the signal electronics housing and is screwed into a threaded bore of the power electronics, wherein a hollow centering dome, in particular made of plastic, is formed on the connecting tab and projects towards the signal electronics housing, in particular parallel to the plug connection direction of the plug connection formed from the plug connector part and the mating plug connector part, wherein a pin, in particular a cross pin, is formed on the signal electronics housing and projects into the hollow centering mandrel, in particular for centering the signal electronics housing relative to the sheet metal housing.

[0019] The advantage here is that tilting is prevented when placing the signal electronics onto the power electronics, as the pin, the guide groove, and the connector itself represent three centering elements with different modes of action. Tilting is prevented by over-determining the three elements, each with different modes of action and thus with tolerances in different directions. The cover is a crucially important centering element, as it provides the majority of the centering elements.

[0020] In an advantageous embodiment, the connecting tab on the cover is angled. This is advantageous because different spatial directions are taken into account when aligning the signal electronics housing.

[0021] In an advantageous embodiment, the cover is a plastic injection-molded part. This allows for simple, cost-effective production, and the centering elements can be integrated simply by molding without additional effort.

[0022] In an advantageous embodiment, protruding pins formed on the cover project into depressions or recesses of a base plate of the electrical device, wherein the sheet metal housing is connected to the base plate, wherein a sheet metal edge of the sheet metal housing projects into a groove of the cover, in particular wherein the sheet metal edge is inserted into the groove by a pivoting movement about the

[0023] The connecting line of the pins, particularly during assembly of the electrical device, is pivoted in, in particular, and thus protrudes. The advantage here is that the smallest clear diameter of the recesses is larger than the largest outer diameter of the pins. This allows the cover to pivot when the pins are inserted into the recesses. During this pivoting movement, which occurs after the pins are inserted into the recesses, the sheet metal edge is inserted, in particular pivoted, into the groove.

[0024] In an advantageous embodiment, the cover has a knockout area, particularly after knocking out the area, a screw becomes accessible that secures an electrical ground connection or PE connection. This is advantageous because this connection can be disconnected or made without making any other changes, and therefore no testing, such as high-voltage testing or the like, is necessary.

[0025] In an advantageous embodiment, the electrical device, in particular the power electronics, has a printed circuit board which is equipped with a heat-generating component, in particular a power semiconductor, a heat sink with at least one cooling fin and a housing part of the sheet metal housing, wherein a socket, in particular a press-in socket, is inserted into a recess of the cooling fin, wherein a screw, the screw head of which presses the printed circuit board with the component towards the heat sink, is screwed into an internal thread of the socket, wherein the socket has a polygonal area which is pressed into the housing part.

[0026] The advantage here is that, on the one hand, the socket is firmly connected to the housing part, and, on the other hand, the screw, when screwed into the socket, positions and / or presses the socket against a step of the heat sink. This presses the circuit board with the component against the heat sink, improving and ensuring heat transfer. At the same time, the screw and press-in nut serve as an electrical ground connection for the housing part, connecting it to a conductor track on the circuit board.

[0027] To increase the safety of the electrical earth connection, the connection can optionally be made double and thus more secure.

[0028] In an advantageous embodiment, the socket has a toothing cut into the material of the cooling fin. This ensures that the heat sink is electrically securely connected and grounded to the socket, and thus also to the screw and the housing part. A PE connection can also be implemented instead of the ground connection.

[0029] In an advantageous embodiment, the toothing is an external toothing. The advantage here is that the toothing cuts into the recess of the heat sink.

[0030] In an advantageous embodiment, the screw extends through the heat sink, in particular through the cooling fin. This advantageously provides an electrical connection between the circuit board and the housing part.

[0031] In an advantageous embodiment, the housing part is arranged on the side of the heat sink facing away from the circuit board, and / or the circuit board is arranged on the side of the heat sink facing away from the housing part. Advantageously, the housing part can be electrically connected by means of the screw to a conductor track of the circuit board, which can be arranged on the other side of the heat sink in a mechanically protected manner.

[0032] In an advantageous embodiment, the housing part is manufactured as a stamped and bent part from sheet metal. This is advantageous because it allows for simple manufacturing.

[0033] In an advantageous embodiment, the polygonal area is arranged flush with the housing part on at least one side of the housing part, in particular on the side of the housing part facing away from the heat sink. In an advantageous embodiment, the polygonal area protrudes radially from the bushing. This is advantageous in that a high degree of rotational stability can be achieved.

[0034] In an advantageous embodiment, the polygonal area is spaced apart from the toothing. It is advantageous that the housing part is spaced apart from a step in the receiving area of ​​the circuit board against which the socket is positioned.

[0035] In an advantageous embodiment, the recess is an interruption in the cooling fin. It is advantageous that the cooling fin has a thickened area in which a hole is provided as a recess.

[0036] In an advantageous embodiment, the bushing is made of steel. This allows for simple and cost-effective production.

[0037] In a preferred embodiment, the heat sink is made of aluminum. This allows the bushing to easily cut into the heat sink material.

[0038] In an advantageous embodiment, the cooling fin has a thickened portion that is interrupted by the recess, in particular, the bushing is inserted into the recess and thus accommodated in the thickened portion. This is advantageous because the bushing can be accommodated easily and securely.

[0039] In an advantageous embodiment, a further socket, in particular a further press-in socket, is inserted into a further recess of a further cooling fin of the heat sink, wherein a further screw, the screw head of which presses the circuit board with a further component towards the heat sink, is screwed into an internal thread of the further socket, wherein the further socket has a further polygonal area which is also pressed into the housing part, wherein the further socket has a further toothing which is cut into the material of the further cooling fin, wherein the further toothing is also an external toothing, wherein the further screw projects through the heat sink, in particular through the further cooling fin. The advantage here is that a sufficiently secure earth connection can be established. This is because the two screws function as an independently functioning electrical earth wire or PE wire.If one of the screws fails, the other one ensures the function.

[0040] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0041] The invention will now be explained in more detail using schematic illustrations:

[0042] Figure 1 shows a cross section through a region of an electrical device according to the invention, wherein a socket 1 is used.

[0043] Figure 2 shows an oblique view of a cut-away area of ​​the electrical device.

[0044] Figure 3 shows an oblique view of the socket 1.

[0045] Figure 4 shows the connection of the sockets 1 with a housing part 5 of the electrical device.

[0046] Figure 5 shows the signal electronics housing 50 of the electrical device in an oblique view.

[0047] Figure 6 shows a cover 60 of the electrical device in an oblique view.

[0048] In Figure 7, the cover 60 is shown from a different viewing direction.

[0049] In Figure 8, the electrical device is shown in an oblique view without the signal electronic housing 50.

[0050] Figure 9 shows the electrical device in an oblique view.

[0051] In Figure 10, the electrical device is equipped with a fan and is shown in an oblique view.

[0052] Figure 11 shows the fan in an oblique view in a first viewing direction.

[0053] Figure 12 shows the electrical device in an oblique view.

[0054] Figure 13 shows an oblique view of the fan from a second viewing direction. As shown in the figures, the electrical device has a circuit board 3, which is pressed toward a heat sink 2 by the head of a screw 4.

[0055] Thus, a heat-generating component, in particular a power semiconductor, mounted on the circuit board 3 is pressed against the heat sink 2, in particular to improve the thermal coupling of the component to the heat sink 2.

[0056] The bushing 1 is preferably designed as a press-in bushing.

[0057] The bushing 1 is inserted into a recess, in particular an interruption, of a cooling fin 20 of the heat sink 2 and has an internal thread into which a threaded portion of the screw 4 is screwed, wherein the bushing 1 is supported in the cooling fin 20 at a step of the cooling fin 20.

[0058] The bushing 1 has a polygonal portion 31, in particular a hexagonal portion, on which the cooling fin 20 protrudes and is pressed into a housing part 5 made of sheet metal. Thus, the bushing 1 is non-rotatably embedded in the housing part 5 and non-rotatably connected to the housing part 5.

[0059] At the end region of the bushing 1 facing away from the polygonal region 31, the bushing 1 has a toothing 30 with which the bushing 1 is inserted into the cooling fin 20 in such a way that the toothing 30 is cut into the material of the cooling fin 20.

[0060] The heat sink 2 including the cooling fin 20 is preferably made of aluminum; the bushing 1 is preferably made of steel.

[0061] The sheet metal of the housing part 5 is preferably made of sheet steel. In particular, the housing part 5 is designed as a stamped and bent part.

[0062] The toothing 30 is designed as an external toothing.

[0063] The housing part 5 is preferably arranged on the side of the heat sink 2 facing away from the circuit board 3. The housing part 5 is detachably connected to the heat sink.

[0064] A pressure plate 7 is arranged between the screw head and the circuit board 3, so that the force flow introduced by the screw 4 is spread out and thus the circuit board 3 is protected from excessive pressure. The pressure plate 7 is preferably made of metal, so that the housing part 5 is electrically connected to a conductor track of the circuit board 3 via the metal socket 1 and the metal screw 4, as well as the metal pressure plate 7. In this way, an earth connection and / or PE connection can be provided for the housing part 5.

[0065] The screw axis of the screw 4 is aligned perpendicular to the direction of extension of the cooling fin 20.

[0066] In further embodiments according to the invention, the component is a power module which comprises a plurality of power semiconductors.

[0067] As shown in more detail in Figures 5 to 9, the electrical device, preferably designed as an inverter or converter, has a sheet metal housing 80 that encloses the power electronics of the electrical device and is designed for installation in a control cabinet. On one side of the electrical device, the sheet metal housing 80 is supplemented by a cover 60, in particular a plastic cover, which is connected to the sheet metal housing 80, and on a bottom side by a base plate 67.

[0068] A signal electronics unit, in particular the signal electronics housing 50, is placed on the power electronics unit, in particular on the sheet metal housing 80 including the cover 60, and is connected by means of screws.

[0069] The cover 60 is manufactured as a plastic injection-molded part and has protruding pins 61, which are inserted into recesses in the base plate 67. By pivoting around the connecting line of the pins 61, the sheet metal edges of the sheet metal housing 80 are pivoted into grooves 66 of the cover 60 during assembly of the electrical device.

[0070] Thus, at least one sheet metal edge protrudes into one of the grooves 66 of the cover 60. Likewise, another sheet metal edge of the cover 60 protrudes into another groove 66 of the cover 60. Thus, the cover 60 can be precisely aligned and centered relative to the sheet metal housing 80. At its end region facing away from the pins 61, the cover 60 has a connecting tab 62 which is bent at a bending angle of 90° from the rest of the cover 60. This connecting tab 62 has a centering hole 63 extending through the connecting tab 62 and a protruding centering dome 64 which is hollow.

[0071] Thus, a first of the screws can be passed through the centering dome 64.

[0072] The cover 60 has a locking lug so that the cover 60 can be clipped to the sheet metal housing 80.

[0073] The sheet metal housing has at least two hollow centering domes 82, which are realized as press-in bushings or screw bushings and are connected to the sheet metal housing 80 accordingly.

[0074] One of the centering domes 82 protrudes through the centering hole 63 and thus supports the centering of the cover to the sheet metal housing 80.

[0075] A second screw projects through the centering dome 82 which projects through the centering hole 63.

[0076] A mating connector part 81 projects through a further recess in the connecting tab 62.

[0077] The cover 60 has a guide groove 70 on one of its sides, which is aligned parallel to the plug-in direction of the signal electronics.

[0078] When placing the signal electronics onto the power electronics, the signal electronics housing 50 is guided in such a way that tilting during placement is prevented.

[0079] For this purpose, the signal electronics housing 50 has at least one guide rib 51 on its inner side, which is received and guided in the guide groove 70, particularly when the signal electronics housing 50 is placed on the sheet metal housing 80. A printed circuit board 52, which is equipped with signal electronics components, is accommodated in the signal electronics housing 50. Furthermore, the printed circuit board 52 is equipped with a connector part 53, which is plugged into the mating connector part 81 of the power electronics, which protrudes through the connecting tab 62.

[0080] Tilting is further prevented by a cross pin 54, which is formed on the signal electronics housing 50, protruding into the centering dome 64.

[0081] Thus, the spatial alignment of the connector housing 50 relative to the power section of the electrical device is effected by the guide rib 51 or several such ribs, which protrude into corresponding guide grooves of the power section, together with the cross pin 54 inserted into the centering dome 64 and the connector part 53, which is or is plug-connected to the mating connector part 81.

[0082] In addition, the centering domes 82 protrude into corresponding cavities of the signal electronics, so that, in particular coming from the outside, screws can be screwed through the signal electronics and through the cavities of the signal electronics as well as through the centering domes 82 into corresponding internal threads of the power electronics.

[0083] The cover 60 thus provides pre-centering when attaching the signal electronics and also performs the housing function of the power electronics. Furthermore, an RFID tag located in the power electronics can be read without hindrance because the cover 60 is made of plastic.

[0084] The cover 60 is easy to label. Additionally, warning labels can be incorporated into the shape of the cover 60, as well as nameplate nests, i.e., recesses suitable for attaching nameplates.

[0085] The cover 60 is made of electrically insulating material.

[0086] The cover 60 also has a knockout area 60, so that after removing the knockout area 60 with a tool, in particular a screwdriver, a screw of the power electronics can be actuated, in particular rotated, whereby an electrical earth connection or electrical PE connection can be secured by means of the screw. As shown in Figures 10 to 13, a fan can be attached to the housing of the electrical device by first bringing the fan housing 100 into a pivoting position by placing a pivot pin 130 of the fan housing 100 against an edge of the sheet metal housing aligned coaxially with the pivot axis and then pivoting, in particular rotating, about this pivot axis by a pivot angle, thereby clipping it into the sheet metal housing 10.

[0087] The fan comprises a fan housing 100, which has a receiving area for an electric motor that drives a fan impeller, and a constricted area in which the airflow conveyed by the fan impeller is constricted and thus has a higher speed. Furthermore, the constricted area 101 is curved in such a way that the airflow conveyed by the fan impeller is deflected by 90° and directed into the interior of the electrical device through front grille openings 120, in particular those facing the fan.

[0088] The air flow flowing through the electrical device then additionally draws in an additional air flow through grille openings 121 arranged on the side of the electrical device, which thus increases the volume flow and also cools laterally arranged heat loss sources of the electrical device and also the sheet metal housing 80.

[0089] On the side of the electrical device opposite the fan there are additional grille openings through which the entire air flow exits.

[0090] In this way, the air flow coming from the fan, which enters the electrical device at a high flow velocity, ensures efficient cooling of the electrical device.

[0091] When clip-connecting the fan housing 100 to the sheet metal housing 80, the fan housing 100 is clip-connected by means of the locking lug 103 formed on the fan housing 100, while two spaced-apart pivot pins 130 formed on the fan housing 100 project into recesses in the sheet metal housing 80 and guide the fan housing 100, in particular in this last phase of the pivoting movement.

[0092] The fan also has a connector part 131 which, when performing the described

[0093] Swiveling movement comes into plug contact with a mating connector part fastened to the sheet metal housing 80. The fan can then be supplied with electricity. With increasing distance from the fan impeller, the flow cross-section in the narrowed area decreases monotonically, whereby initially a width of the interior area of ​​the fan made available to the air flow by the fan cover becomes monotonically smaller and then a height of the interior area of ​​the fan made available to the air flow by the fan cover becomes increasingly smaller. In particular, the width is measured in a direction parallel to the nearest surface of the sheet metal housing and the height is measured in a direction parallel to the normal direction of the nearest, in particular flat, surface.

[0094] List of reference symbols

[0095] 1 bushing, especially press-in bushing

[0096] 2 heat sinks

[0097] 3 circuit board

[0098] 4 screw

[0099] 5 Housing part

[0100] 6 Heat-generating component

[0101] 7 printing plate

[0102] 20 cooling fins

[0103] 30 Gearing

[0104] 31 Polygonal area, especially hexagonal area

[0105] 50 signal electronics housings

[0106] 51 Guide rib

[0107] 52 printed circuit board with signal electronic components

[0108] 53 Connector part

[0109] 54 Cross pin

[0110] 60 Cover, especially plastic cover

[0111] 61 cones

[0112] 62 connecting strap

[0113] 63 Centering hole

[0114] 64 Centering dome

[0115] 65 knockout area

[0116] 66 grooves

[0117] 67 Base plate

[0118] 70 guide groove

[0119] 80 sheet metal housings for power electronics

[0120] 81 Mating connector part

[0121] 82 Centering dome

[0122] 90 recess, through the signal electronics housing 50

[0123] 100 Fan housing 101 Constricted area of ​​the fan housing 100

[0124] 102 guide pins

[0125] 103 locking lug

[0126] 120 front grille openings 121 side grille openings

[0127] 130 swivel pins

[0128] 131 Connector part

Claims

Patent claims:

1. Electrical device, in particular converter or inverter, with a sheet metal housing and a fan, wherein the fan has a fan housing, - which is clip-connected to the sheet metal housing and - which has a pivot pin (130) which is positioned against an edge of the sheet metal housing acting as a pivot axis and / or which is positioned against a pivot axis aligned coaxially with an edge of the sheet metal housing for pivoting the fan relative to the sheet metal housing and / or which is positioned against a pivot axis which is arranged and / or aligned in alignment with an edge of the sheet metal housing for pivoting the fan relative to the sheet metal housing, in particular which is positioned against a rotation axis aligned coaxially with an edge of the sheet metal housing for rotating the fan relative to the sheet metal housing, in particular wherein the pivoting, in particular rotating, of the fan housing is blocked by the clip connection between the fan housing and the sheet metal housing and / or can be carried out after the clip connection between the fan housing and the sheet metal housing has been released.

2. Electrical device according to claim 1, characterized in that the pivot pin (130) is L-shaped, wherein the edge of the sheet metal housing is positioned against the inner corner of the L, and / or that a locking lug is formed on the fan housing, which is clipped into a recess or depression in the sheet metal housing, in particular wherein the locking lug is spaced apart from the pivot pin (130) and / or wherein the locking lug protrudes in the opposite direction to the pivot pin (130) on the fan housing.

3. Electrical device according to one of the preceding claims, characterized in that guide pins (102) are formed on the fan housing, which guide the fan housing at least when releasing or closing the clip connection.

4. Electrical device according to one of the preceding claims, characterized in that the fan housing including the pivot pin, guide pin and / or locking lug is designed as a plastic injection-molded part, in particular is designed in one piece and / or in one part.

5. Electrical appliance according to one of the preceding claims, characterized in that the fan housing has a receiving area for a fan wheel driven by an electric motor and a narrowed area such that the air flow conveyed by the fan wheel is narrowed when flowing through the narrowed area and thus its average flow speed is increased.

6. Electrical device according to one of the preceding claims, characterized in that the narrowed region is rounded in such a way that the air flow flowing through the narrowed region is deflected by 90° out of the fan in a direction perpendicular to the axis of rotation of the fan wheel and flows through front grille openings (120) of the sheet metal housing, in particular facing the fan, into the interior of the electrical device, in particular into the interior region enclosed by the sheet metal housing.

7. Electrical device according to one of the preceding claims, characterized in that the sheet metal housing has further grille openings (121) arranged laterally on the electrical device, through which the air flow flowing through the electrical device draws in an additional air flow, in particular which thus increases the volume flow and also cools laterally arranged waste heat sources of the electrical device, and the sheet metal housing, in particular wherein third grille openings are arranged on the side of the electrical device opposite the fan, through which the entire air flow exits.

8. Electrical device according to one of the preceding claims, characterized in that the fan cover is shaped such that with increasing distance from the fan wheel the flow cross section in the narrowed area decreases monotonically, in particular wherein initially a width of the interior region of the fan made available to the air flow by the fan cover becomes monotonically smaller and then a height of the interior region of the fan made available to the air flow by the fan cover becomes increasingly smaller, in particular wherein the width is measured in a direction parallel to the nearest surface of the sheet metal housing and the height is measured in a direction parallel to the normal direction of the nearest, in particular flat, surface.

9. Electrical device according to one of the preceding claims, characterized in that the electrical device comprises power electronics, in particular a power section, and signal electronics, in particular a control section, wherein the power electronics comprises the sheet metal housing forming a housing with a cover, wherein the signal electronics comprises a signal electronics housing which is placed on the power electronics, wherein the cover has a connecting tab through which a mating connector part of the power electronics protrudes, wherein a connector part of the signal electronics is connected to the mating connector part, wherein a guide groove is formed in the cover, in particular wherein the guide groove extends parallel to the plug connection direction, wherein a guide rib formed on an inner side of the signal electronics housing protrudes into the guide groove and / or is guided by it,wherein at least one first centering dome (82) is arranged on the sheet metal housing and projects towards the signal electronics housing, wherein a screw projects through the centering dome (82), which also projects through the signal electronics housing and is screwed into a threaded bore of the power electronics, wherein a hollow centering dome (64), in particular formed from plastic, is formed on the connecting tab and projects towards the signal electronics housing, in particular parallel to the plug-in connection direction of the plug-in connection formed from the plug-in connector part and the mating plug-in connector part, wherein a pin, in particular a cross pin, is formed on the signal electronics housing, which projects into the hollow centering mandrel (64), in particular for centering the signal electronics housing relative to the sheet metal housing.

10. Electrical device according to one of the preceding claims, characterized in that the connecting tab on the cover is formed at an angle, and / or that the cover is a plastic injection-molded part, and / or that protruding pins formed on the cover project into depressions or recesses in a base plate of the electrical device, wherein the sheet metal housing is connected to the base plate, wherein a sheet metal edge of the sheet metal housing projects into a groove in the cover, in particular wherein the sheet metal edge is pivoted into the groove by a pivoting movement around the connecting line of the pins 6, in particular during assembly of the electrical device, in particular and thus projects into it.

11. Electrical device according to one of the preceding claims, characterized in that the cover has a knockout area, in particular after the knockout area a screw becomes accessible which secures an electrical earth connection or PE connection, and / or that the electrical device, in particular the power electronics, has a printed circuit board which is equipped with a heat-generating component, in particular a power semiconductor, a heat sink with at least one cooling fin and a housing part of the sheet metal housing, wherein a socket, in particular a press-in socket, is inserted into a recess in the cooling fin, wherein a screw, the screw head of which presses the printed circuit board with the component towards the heat sink, is screwed into an internal thread of the socket, wherein the socket has a polygonal area which is pressed into the housing part.

12. Electrical device according to one of the preceding claims, characterized in that the socket has a toothing which is cut into the material of the cooling fin, and / or that the toothing is an external toothing, and / or that the screw projects through the heat sink, in particular through the cooling fin, and / or that the housing part is arranged on the side of the heat sink facing away from the printed circuit board, and / or that the printed circuit board is arranged on the side of the heat sink facing away from the housing part, and / or that the housing part is manufactured as a stamped and bent part from a sheet metal.

13. Electrical device according to one of the preceding claims, characterized in that on at least one side of the housing part, in particular on the side of the housing part facing away from the heat sink, the polygonal area is arranged flush with the housing part.

14. Electrical device according to one of the preceding claims, characterized in that the polygonal area on the socket protrudes radially, and / or that the polygonal area is spaced from the toothing, and / or that the recess is an interruption of the cooling fin, and / or that the socket is made of steel, and / or that the heat sink is made of aluminum.

15. Electrical device according to one of the preceding claims, characterized in that the cooling fin has a thickening which is interrupted by the recess, in particular wherein the socket is inserted into the recess and thus received in the thickening, and / or that a further socket, in particular a further press-in socket, is inserted into a further recess of a further cooling fin of the heat sink, wherein a further screw, the screw head of which presses the circuit board with a further component towards the heat sink, is screwed into an internal thread of the further socket, wherein the further socket has a further polygonal area which is also pressed into the housing part, wherein the further socket has a further toothing which is cut into the material of the further cooling fin, wherein the further toothing is also an external toothing, wherein the further screw is passed through the heat sink,especially through the further cooling fin,

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