Electrical apparatus comprising a housing part

Abstract

An electrical apparatus comprising a housing part, the housing part having a through-opening in which and / or within which an insulating disc is located, the insulating disc being held in place by means of at least one first retaining connector.

Description

[0001] Electrical appliance with a housing part

[0002] Description:

[0003] The invention relates to an electrical device with a housing part.

[0004] It is generally known that, depending on the network used, how

[0005] Whether it's an IT network, a TN network or a TT network, an electrical device must comply with different electrical protection regulations.

[0006] An electrical appliance housing is known from US patent 2016 / 0295722 A1.

[0007] A railbus connection technology for an electrical device is known from US 2008 / 0160840 A1.

[0008] The invention is therefore based on the objective of further developing an electrical device to be used flexibly.

[0009] According to the invention, the problem is solved in the electrical device according to the features specified in claim 1.

[0010] Key features of the invention for the electrical device with a housing part are that the housing part has a through-opening in which and / or within which an insulating disc is arranged, wherein the insulating disc is held by means of at least one retaining rib, in particular wherein the first retaining rib connects the insulating disc to the edge of the through-opening. An advantage is that, depending on the respective safety regulations, the electrical device can be manufactured in suitably appropriate variants. In the first variant, the insulating disc is securely contained and performs no function. Only by breaking out the insulating disc is the disc accessible, and the second variant can be produced by installing the broken-out insulating disc, wherein the insulating disc performs a function in the second variant, namely electrical insulation.

[0011] In an advantageous embodiment, the insulating washer is radially spaced from the edge of the through-opening. It is advantageous that the insulating washer is positioned in a clearly visible manner. The radial direction is referenced to the axis of rotational symmetry of the circular cylindrical surface of the insulating washer's outer circumference. Likewise, the circumferential direction is referenced to this axis of rotational symmetry. The parallel direction is aligned parallel to the axis of rotational symmetry. However, instead of the axis of rotational symmetry, the axis of rotation of the screw could also be used, since this axis is coaxial with the axis of rotational symmetry.

[0012] In an advantageous embodiment, the housing part, including the insulating slide and the first retaining web, is designed as a single-piece injection-molded plastic part, particularly wherein the injection-molded plastic part is made of electrically insulating plastic. The advantage here is that simple and cost-effective manufacturing is possible.

[0013] In an advantageous embodiment, a second retaining rib, spaced apart from the first retaining rib, holds the insulating disc, particularly in that the second retaining rib connects the insulating disc to the edge of the through-opening. This is advantageous because it ensures stable retention of the insulating disc. In an advantageous embodiment, the first retaining rib is spaced from the second retaining rib by a circumferential angle of less than 180° with respect to the axis of rotational symmetry of the insulating disc, particularly by a circumferential angle between 40° and 120°. This is advantageous because a simple rotational movement of the insulating disc does not overload both retaining ribs. In particular, the rotational movement can be performed about an axis of rotation that is aligned parallel to the plane of the disc initially occupied by the insulating disc, the normal of which is parallel to the axis of rotational symmetry of the circular cylindrical surface of the outer circumference of the insulating disc.

[0014] In an advantageous embodiment, the insulating disc has a non-circular recess for the purpose of securing a tool, particularly in a rotationally fixed manner. The advantage here is that a non-circular tool can be accommodated in the recess and that a high torque can be exerted on the insulating disc when it rotates around its own axis. Removing the insulating disc with a screwdriver is particularly effective when a tilting motion of the screwdriver is performed to release the disc, i.e., a rotational movement around an axis of rotation that intersects the two retaining lugs.

[0015] In an advantageous embodiment, the insulating washer has an axially projecting collar area that extends continuously around the circumference of the cylindrical outer circumference of the insulating washer, relative to the axis of rotational symmetry, and which radially limits the screw head. The advantage of this is that insulation distances are maintained reliably and precisely, since the screw's freedom of movement is limited.

[0016] In a preferred embodiment, the recess is arranged, particularly centrally, in one end face of the insulating glass unit. This design offers the advantage of easy operation.

[0017] In an advantageous embodiment, the electrical device has a circuit board through which a screw, screwed into a threaded bore of a heat sink of the electrical device, protrudes. In particular, the screw head presses against the conductor track, or the screw head presses the insulating washer, which has been pushed onto the screw after being broken out of the housing part, against the conductor track. It is advantageous that the heat sink can be electrically connected to a conductor track by means of the screw, thereby connecting the conductor track to ground and / or a protective conductor or neutral conductor. In this way, the conductor track and / or the heat sink can be protected according to the network requirements.

[0018] In an advantageous embodiment, the area of ​​the threaded bore not contacting the screw covers a larger area in the direction of the bore axis than the width of the insulating washer in that direction. It is advantageous that the screw can be screwed into the threaded bore both with and without an insulating washer positioned between the screw head and the conductor track.

[0019] In an advantageous embodiment, the edge of the non-circular recess in the insulating disc is formed from electrically insulating material, in particular epoxy resin-containing material, and thus has only electrically insulating areas, and in particular no electrically conductive areas. It is advantageous that the circuit board is also insulated towards the insulating disc.

[0020] Preferably, the non-circular recess is an elliptically shaped non-circular recess. An advantage of this is that a tool can be positively engaged and there are no sharp edges on the insulating disc, so that smooth transitions of the electric field can be achieved when using the insulating disc in the second variant.

[0021] In an advantageous embodiment, the screw axis is coaxially aligned with the axis of rotational symmetry of the cylindrical surface of the outer circumference of the insulating washer. An advantage of this is that the screw can be actuated through the space free after removal of the insulating washer.

[0022] In an advantageous embodiment, the screw head rests in contact with a conductor track of the printed circuit board, particularly if the screw head is pressed against the conductor track. It is advantageous that the grounding contact is accessible via the mechanical fastening.

[0023] In an advantageous embodiment, the screw and the heat sink are made of metal, and the conductor track is also made of metal. An advantage of this is that no additional effort is required. Important features of the method for manufacturing a second variant of an electrical device from a first variant of the electrical device are that, particularly for manufacturing the second variant from the first variant, in a first process step, a screw, held by a first retaining rib connected to the housing part of the first variant, is aligned coaxially with the screw axis of a screw that presses a circuit board onto a metal heat sink. The screw is screwed into a threaded hole in the heat sink, and the screw head presses the insulating washer against a conductor track of the circuit board.

[0024] The insulating washer is separated from the housing part by destroying the retaining tab. In a second process step, performed after the first, the screw is unscrewed from the threaded hole. In a third process step, performed after the second, the metal screw is inserted through a non-circular recess in the insulating washer and screwed into the threaded hole of the heat sink, so that the screw head presses the insulating washer against the conductor track of the printed circuit board, thus interrupting the electrical connection between the screw and the conductor track via the insulating washer. An advantage of this method is that, depending on the network used, the conductor track is either grounded via the heat sink or not. This can be achieved by placing the insulating washer between the screw head and the conductor track.In a preferred embodiment, a conductor track of the circuit board in the first variant of the electrical device is connected to the heat sink, and in particular to a protective conductor and / or electrical ground. The advantage here is that the conductor track can be protected according to the network used.

[0025] In an advantageous embodiment, a conductor track of the circuit board in the second variant of the electrical device is electrically isolated from the heat sink, and thus from the protective conductor and / or electrical earth, by means of the insulating washer, particularly in which the heat sink forms at least part of the housing in the first variant and at least part of the housing in the second variant. It is advantageous that the conductor track can be protected according to the network used.

[0026] In a preferred embodiment, the heat sink of the first variant of the electrical device is connected to a protective conductor and / or electrical earth. The advantage here is that increased safety can be achieved.

[0027] In an advantageous embodiment, the heat sink in the second variant of the electrical device is electrically isolated from the protective conductor and / or electrical earth by means of the insulating washer, particularly in that the heat sink forms at least part of the housing in the first variant and at least part of the housing in the second variant. An advantage of this is that a simple, cost-effective, and secure means of insulation is provided.

[0028] Key features of the electrical appliance series manufactured using the aforementioned method are that the series includes both the first and second variants. An advantage of this is that the second variant can be produced from the first by removing the insulating washer from the housing and using it to insulate the heat sink.

[0029] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art.

[0030] The invention will now be explained in more detail with reference to schematic illustrations:

[0031] Figure 1 shows an oblique view of a first variant of an electrical device of a series of electrical devices according to the invention.

[0032] Figure 2 shows a corresponding sectional view.

[0033] Figure 3 shows an oblique view of an area according to the invention of a second variant of an electrical device of a series of electrical devices according to the invention.

[0034] Figure 4 shows a sectional view corresponding to the second variant shown in Figure 3.

[0035] As shown in the figures, the series according to the invention comprises at least a first variant of an electrical device and a second variant of an electrical device.

[0036] In the first variant of the electrical device, an insulating disc 3 is arranged within a continuous opening, i.e., through-opening 5, and is held by means of retaining webs 4 extending radially from the disc to the edge of the through-opening 5.

[0037] Thus, the insulating washer 3 is held securely to the housing part 1 of the electrical device.

[0038] The housing part 1, including the retaining tabs 4 and the insulating disc 3, is manufactured as a single-piece injection-molded plastic part. The plastic used is electrically insulating.

[0039] By breaking out the insulating disc 3 using a tool, in particular a screwdriver, the insulating disc 3 can be used for insulation.

[0040] For this purpose, the insulating washer 3 is arranged between the screw head of a metal screw 22 and a conductor track of a circuit board 20, wherein the screw 22 is screwed into a threaded hole of a metal heat sink.

[0041] The screw penetrates the insulating washer 3. In this way, the insulating washer 3 effectively interrupts an electrical connection between the conductor track of the circuit board 20 and the screw head of the screw 22, which would otherwise exist, particularly in the first variant of the electrical device, and a second variant of the electrical device is produced from the first variant.

[0042] In the first variant, the heat sink 21 is electrically grounded via the screw and the conductor track, or the conductor track is grounded via the screw and the heat sink 21. In the second variant, however, this conductor track is not grounded via the screw and the heat sink 21, or at least not at this point. Alternatively, in the second variant, the heat sink 21 is not electrically grounded, in particular not via the circuit board containing the conductor track.

[0043] The electrical device can therefore be configured in different versions depending on the electrical connection. Preferably, the device is manufactured in the first version and then delivered to a geographically different location, where it is either put into operation unchanged or first converted to the second version and then put into operation. Which version is used is determined by the AC power grid in the respective application. In particular, it must be considered whether an IT network, a TN network, or a TT network is used.

[0044] The manufactured electrical device thus has, as shown in Figure 1 and Figure 2, the housing part 1, which is designed as a plastic injection molded part, which has the through-opening 5 through the wall of the housing part 1, in which the insulating disc 3 is arranged, which is held by the, preferably two, retaining webs 4, which open into the rest of the housing part 1 at the edge of the through-opening.

[0045] The housing part 1, together with the heat sink 21, forms the housing of the electrical device.

[0046] The electrical device is preferably an inverter intended for supplying power to an electric motor.

[0047] The two retaining webs 4 are spaced apart from the axis of rotational symmetry of the insulating disk 3 in the circumferential direction by a circumferential angle of less than 180°, but are arranged at the same radial distance. In particular, the two retaining webs 4 are spaced apart in the circumferential direction by a circumferential angle of less than 120° and more than 40'.

[0048] The insulating disc 3 has a non-circular recess 6, so that after insertion into the recess 6 and subsequent rotation, in particular tilting, of the tool, it is able to overload the retaining webs 4 and after the failure of the retaining webs 4 the insulating disc is separated from the housing part 1.

[0049] Preferably, the insulating disc is removed particularly effectively using a screwdriver as a tool if a tilting movement of the screwdriver is performed to remove the insulating disc, i.e. a rotational movement around an axis of rotation which intersects the two retaining tabs.

[0050] The threaded bore of the heat sink 21 is designed to be so deep that the screw for pressing the circuit board 20 against the heat sink 21 can be screwed in deep enough even after the insulating washer 3 has been placed between the conductor track of the circuit board 20 and the screw head of the screw 22.

[0051] This means that the area of ​​the threaded bore of the heat sink 21 of the second variant that is not in contact with the screw is longer in the direction of the threaded bore axis than the axial wall thickness of the insulating washer 3.

[0052] Furthermore, the insulating washer 3 rests against the conductor track of the circuit board 20 and against the screw head of the screw 22, in particular against the underside of the screw head of the screw 22.

[0053] A symbolic illustration 2 is formed on the outside of the housing part 1, in particular which is implemented in the plastic injection molded part and shows the viewer the appropriate use of the tool in the step of removing the insulating disc 3 from the housing part 1.

[0054] In both the first and second variants, the insulating washer 3 is coaxially aligned with the screw 22. Specifically, the axis of rotational symmetry of the cylindrical outer circumference of the insulating washer 3 is coaxial with the screw axis of the screw 22. Therefore, in the second variant, the screw 22 can be actuated through the through-opening 5 using a tool.

[0055] To receive and center the screw head of screw 22, the insulating washer has an axially projecting collar 7 that extends continuously around the circumference of the cylindrical outer circumference of the insulating washer 3, relative to the axis of rotational symmetry. This collar 7 radially limits the screw head. Otherwise, the screw 22 would have some freedom of movement due to the non-circular recess in the insulating washer 3. However, since the screw head rests against the collar 7, this freedom of movement is restricted.

[0056] Preferably, the non-circular recess is slot-shaped or elliptical, so that a screwdriver can be easily inserted and, when rotated about its own axis, is positively engaged with the insulating disc 3. Alternatively, a round, in particular circular, recess can also be used, since the insulating disc 3 can be broken out by rotating the screwdriver about an axis of rotation that encompasses the two retaining ribs or about an axis of rotation that is coaxial with the perpendicular center of the insulating disc 3.

[0057] In further embodiments of the invention, a further through-opening 5 is formed in the housing part, within which a further insulating disc 3 is held by further retaining webs 4. Thus, in the event of loss or destruction of the first insulating disc 3, a further insulating disc 3 is available, thereby increasing safety.

[0058] In further embodiments according to the invention, the aforementioned conductor track of the printed circuit board 20 is galvanically connected to a zero-voltage potential of signal electronics mounted on the printed circuit board 20. Preferably, the zero-voltage potential is generated by a capacitive voltage divider, which is supplied by the DC-side terminal of a rectifier, the AC-side terminal of which is supplied by an AC power supply network. (List of reference numerals)

[0059] 1 Housing part 2 Illustration

[0060] 3 insulating washer

[0061] 4 boarding bridge

[0062] 5 passage opening

[0063] 6 Non-circular recess of the insulating disc 3 7 Collar area

[0064] 20 circuit boards

[0065] 21 heat sinks

[0066] 22 screw

Claims

Patent claims:

1. Electrical appliance with a housing part, characterized in that the housing part has a through-opening in which and / or within which an insulating disc is arranged, wherein the insulating disc is held by means of at least one first retaining web, in particular wherein the first retaining web connects the insulating disc to the edge of the through-opening.

2. Electrical device according to claim 1, characterized in that the insulating disc is radially spaced from the edge of the through-opening.

3. Electrical device according to one of the preceding claims, characterized in that the housing part together with the insulating slide and the first retaining web is designed as a particularly one-piece injection-molded plastic part, in particular wherein the injection-molded plastic part is made of electrically insulating plastic.

4. Electrical device according to one of the preceding claims, characterized in that a second retaining rib spaced apart from the first retaining rib holds the insulating disc, in particular wherein the second retaining rib connects the insulating disc to the edge of the through-opening.

5. Electrical device according to one of the preceding claims, characterized in that the first retaining web is spaced apart from the second retaining web by a circumferential angle of less than 180° with respect to the axis of rotational symmetry of the insulating disk, in particular by a circumferential angle between 40° and 120°.

6. Electrical device according to one of the preceding claims, characterized in that the insulating disc has a recess, in particular a non-circular recess, for the particularly rotationally fixed reception of a tool, in particular wherein the rotationally fixed reception is related to an axis of rotation, in particular for the tilting movement of the tool, which intersects the two retaining webs and / or that the non-circular recess is elliptical or slotted, in particular slotted or rectangular slotted.

7. Electrical device according to one of the preceding claims, characterized in that the insulating disc has an axially projecting collar area which extends continuously around the circumference with respect to the axis of rotational symmetry of the cylindrical outer circumference of the insulating disc and which radially limits the screw head.

8. Electrical device according to one of the preceding claims, characterized in that the recess is arranged, in particular centrally, in an end face of the insulating disc.

9. Electrical device according to one of the preceding claims, characterized in that the electrical device has a circuit board through which a screw screwed into a threaded bore of a heat sink of the electrical device protrudes, in particular the screw head of which presses onto the conductor track or the screw head of which presses the insulating washer pushed onto the screw after breaking out of the housing part against the conductor track.

10. Electrical device according to one of the preceding claims, characterized in that the area of ​​the threaded bore not touching the screw covers a larger area in the direction of the axis of the threaded bore than the width of the insulating washer in this direction.

11. Electrical device according to one of the preceding claims, characterized in that the edge of the non-circular recess of the insulating disc is formed from electrically insulating material, in particular epoxy resin-containing material, and in particular has only electrically insulating areas, in particular no electrically conductive areas, and / or that the screw axis of the screw is coaxially aligned with the axis of rotational symmetry of the cylindrical surface of the outer circumference of the insulating disc.

12. Electrical device according to one of the preceding claims, characterized in that the screw head of the screw is in contact with a conductor track of the circuit board, in particular wherein the screw head is pressed against the conductor track, and / or the screw and the heat sink are made of metal and the conductor track is also made of metal.

13. Method for manufacturing a second variant of an electrical device from a first variant of the electrical device, in particular according to one of the preceding claims, characterized in that, in particular for manufacturing the second variant from the first variant, in a first method step, a screw, held by a first retaining web connected to the housing part of the first variant, is aligned coaxially with a screw axis of a screw which presses a printed circuit board onto a heat sink made of metal and is screwed into a threaded bore of the heat sink, the screw head of which presses the insulating washer against a conductor track of the printed circuit board. The insulating disc is separated from the housing part by destroying the retaining bridge, and in a second process step, carried out after the first process step, the screw is unscrewed from the threaded hole, and in a third process step, carried out after the second process step, the metal screw is inserted through a non-circular recess in the insulating disc and screwed into the threaded hole of the heat sink, so that the screw head presses the insulating disc against the conductor track of the circuit board, and thus the electrical connection between the screw and the conductor track is interrupted by means of the insulating disc.

14. A method according to one of the preceding claims, characterized in that, in the first variant of the electrical device, a conductor track of the printed circuit board is connected to the heat sink, in particular, and thus to a protective conductor and / or electrical earth, and that, in the second variant of the electrical device, a conductor track of the printed circuit board is electrically separated from the heat sink, in particular, and thus from the protective conductor and / or electrical earth, by means of the insulating washer, in particular wherein the heat sink forms at least part of the housing in the first variant and at least part of the housing in the second variant.

15. Series of electrical appliances manufactured according to a method according to one of the preceding claims, characterized in that the series of electrical appliances comprises the first variant and the second variant.

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