Electrical device with housing part

Abstract

The invention relates to an electrical device having a housing part, wherein the housing part has a through-opening, in which and / or within which an insulation gasket is arranged, wherein the insulation gasket is held by means of at least one first holding rib.

Description

Technical Field

[0001] This invention relates to an electrical device having a housing component. Background Technology

[0002] As is well known, depending on the power grid used (such as IT grid, TN grid or TT grid), electrical equipment must meet different electrical protection regulations.

[0003] An electrical equipment housing is known from US 2016 / 0295722 A1.

[0004] A busbar connection technique in an electrical apparatus is known from US 2008 / 0160840 A1. Summary of the Invention

[0005] Therefore, the object of the present invention is to improve electrical equipment to make its application more flexible.

[0006] According to the present invention, the objective is achieved by an electrical device having the features described in claim 1.

[0007] An important feature of this invention in electrical equipment having a housing component is that...

[0008] The housing component has a through opening, and an insulating gasket is arranged in and / or within the through opening.

[0009] The insulating gasket is held in place by at least one first retaining rib.

[0010] In particular, the first retaining rib connects the insulating pad to the edge of the through opening.

[0011] The advantage here is that, according to the relevant protection regulations, the electrical equipment can be made into a suitable variant. Therefore, in the first variant, the insulating gasket is designed to prevent loss and does not perform any function at this time. The insulating gasket can only be used by removing it, and a second variant can be made by inserting the removed insulating gasket, in which the insulating gasket performs its function, namely electrical insulation.

[0012] In an advantageous design, the insulating gaskets are radially spaced from the edges of the through-opening. The advantage here is that the arrangement of the insulating gaskets is clearly visible. Here, the radial direction is referenced to the axis of rotational symmetry of the cylindrical circumferential surface of the outer periphery of the insulating gasket. Similarly, the circumferential direction is referenced to this axis of rotational symmetry. The parallel direction is parallel to this axis of rotational symmetry. However, in this text, instead of the axis of rotational symmetry, the screw axis may also be referred to, since it is coaxially oriented with the axis of rotational symmetry.

[0013] In one advantageous design, the housing component, along with the insulating gasket and the first retaining rib, is designed as a single, integrally molded plastic part.

[0014] In particular, the plastic injection molded parts are made of electrically insulating plastic. The advantage of this is that it enables simple and low-cost manufacturing.

[0015] In one advantageous design, a second retaining rib, spaced apart from the first retaining rib, retains the insulating gasket.

[0016] In particular, the second retaining rib connects the insulating pad to the edge of the through opening. This has the advantage of ensuring stable retention of the insulating pad.

[0017] In an advantageous design, the first retaining rib and the second retaining rib are spaced apart by a circumferential angle of less than 180°, particularly by a circumferential angle between 40° and 120°, said circumferential angle being referenced to the rotational symmetry axis of the insulating gasket. The advantage here is that a simple rotational movement of the insulating gasket can overload both retaining ribs. In particular, rotational movement can be performed about an axis of rotation parallel to the plane of the insulating gasket where it initially lies, the normal to which is parallel to the rotational symmetry axis of the cylindrical circumferential surface of the outer periphery of the insulating gasket.

[0018] In an advantageous design, the insulating gasket has a non-circular notch for receiving tools, particularly in a non-rotatable manner. The advantage here is that a non-circular tool can be received in the notch, and a high torque can be applied to the insulating gasket during rotation about its own axis. When using a screwdriver as the tool, the insulating gasket is removed particularly efficiently if it is moved at an angle (i.e., a rotational movement about an axis of rotation intersecting the two retaining ribs).

[0019] In one advantageous design, the insulating washer has an axially projecting flange region that extends uninterruptedly in the circumferential direction around the axis of rotational symmetry of the cylindrical outer periphery of the insulating washer, the flange region radially restricting the screw head. The advantage here is that the insulation distance is reliably and accurately maintained because the screw's free movement space is restricted.

[0020] In an advantageous design, the notch is arranged, particularly centrally, on the end side of the insulating pad. The advantage of this is that it allows for simple operation.

[0021] In one advantageous design, the electrical device has a circuit board through which a screw, screwed into a threaded hole in the cooling body of the electrical device, passes.

[0022] Specifically, the screw head presses against the printed conductor, or the screw head, after being removed from the housing component, is pressed against the printed conductor by an insulating washer fitted onto the screw. The advantage here is that the coolant can be electrically connected to the printed conductor via the screw, thereby connecting the printed conductor to the electrical grounding terminal and / or protective conductor or neutral conductor. Therefore, in this way, the printed conductor and / or coolant can be protected according to the power grid.

[0023] In an advantageous design, the area of ​​the threaded hole that does not contact the screw covers a greater extent in the direction of the hole's axis than the width of the insulating washer in that direction. This has the advantage that the screw can be screwed into the threaded hole both with the insulating washer positioned between the screw head and the printed conductor, and without the insulating washer positioned between the screw head and the printed conductor.

[0024] In an advantageous design, the edges of the non-circular notch in the insulating pad are made of an electrically insulating material, particularly an epoxy resin-containing material, thus creating only electrically insulating areas and no conductive areas. The advantage here is that the circuit board is also insulated from the insulating pad.

[0025] Preferably, the non-circular notch is an elliptical non-circular notch. The advantage here is that it can form-lockingly receive the tool, and there are no sharp edges designed on the insulating pad, thus enabling a smooth distribution of the electric field when using the insulating pad in the second variant.

[0026] In an advantageous design, the screw axis is oriented coaxially with the axis of rotational symmetry of the cylindrical circumferential surface of the outer periphery of the insulating washer. This allows for manipulation of the screw through the space vacated after the insulating washer is removed.

[0027] In one advantageous design, the screw head contacts the printed conductor on the circuit board.

[0028] In particular, the screw head presses against the printed conductor. The advantage of this is that grounding contact can be achieved through mechanical fixing.

[0029] In one advantageous design, the screws and cooling element are made of metal, as are the printed wires. The advantage here is that no additional costs are required.

[0030] An important feature of the method for manufacturing a second variant of an electrical device from a first variant of the electrical device is that...

[0031] In particular, in order to create a second variant from a first variant,

[0032] In the first method step,

[0033] By breaking the retaining rib, the insulating gasket is separated from the housing component.

[0034] - Retained by a first retaining rib connected to the housing component of the first variant,

[0035] - Oriented coaxially with the screw axis, the screw presses the circuit board onto a metal cooling element and is screwed into the threaded hole of the cooling element. The screw head presses an insulating washer against the printed conductors of the circuit board.

[0036] In the second method step, which is performed after the first method step, the screw is unscrewed from the threaded hole.

[0037] In the third method step, performed temporally after the second method step, a metal screw is passed through a non-circular notch in an insulating washer and screwed into a threaded hole in the cooling body. The screw head presses the insulating washer against the printed conductors on the circuit board, thereby disconnecting the electrical connection between the screw and the printed conductors. An advantage here is that, depending on the electrical grid used, the printed conductors may be grounded or ungrounded through the cooling body, which can be achieved by placing the insulating washer between the screw head and the printed conductors.

[0038] In an advantageous design, in a first variant of the electrical equipment, the printed conductors of the circuit board are connected to the cooling body, and in particular, to the protective conductor and / or the electrical grounding terminal. The advantage here is that the printed conductors can be protected according to the power grid used.

[0039] In an advantageous design, in a second variant of the electrical equipment, the printed conductors on the circuit board are electrically isolated from the cooling body by means of insulating pads, and in particular, electrically isolated from the protective conductor and / or the electrical grounding terminal.

[0040] In particular, in the first variant, the cooling element at least partially constitutes the housing, and in the second variant, the cooling element at least partially constitutes the housing. An advantage here is that the printed conductors can be protected according to the power grid used.

[0041] In an advantageous design, in the first variant of the electrical equipment, the cooling element is connected to a protective conductor and / or an electrical grounding terminal. The advantage here is that greater safety can be achieved.

[0042] In an advantageous design, in a second variant of the electrical equipment, the cooling body is electrically isolated from the protective conductor and / or the electrical grounding terminal by means of insulating gaskets.

[0043] In particular, in the first variant, the cooling body at least partially constitutes the housing, and in the second variant, the cooling body at least partially constitutes the housing. An advantage here is the existence of a simple, inexpensive, and loss-proof insulation solution.

[0044] An important feature of the series of electrical equipment manufactured according to the aforementioned method is that the series of electrical equipment has a first variant and a second variant. The advantage here is that the second variant can be generated from the first variant by removing the insulating gasket from the housing and using it for insulation of the cooling body.

[0045] Further advantages are given by the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, particularly for purposes proposed and / or proposed by comparison with the prior art, other reasonable combinations of features of the claims and / or individual claims and / or description features and / or drawings are possible. Attached Figure Description

[0046] The invention will now be described in more detail with reference to the illustrative drawings:

[0047] exist Figure 1 The diagram shows an area of ​​a first variant of an electrical device in the series of electrical devices according to the invention, viewed from a perspective view.

[0048] exist Figure 2 The relevant sectional view is shown in the figure.

[0049] exist Figure 3 The oblique view shows the region according to the invention of the second variant of the electrical device in the series of electrical devices according to the invention.

[0050] exist Figure 4 The middle shows with Figure 3 The second variant-related cross-sectional view shown. Detailed Implementation

[0051] As shown in the figure, the series according to the present invention includes at least a first variant of the electrical equipment and a second variant of the electrical equipment.

[0052] In this first variant of the electrical equipment, the insulating pad 3 is arranged in the through opening, i.e., the through opening 5, and is held by means of a retaining rib 4 extending radially from the pad toward the edge of the through opening 5.

[0053] Therefore, the insulating pad 3 is held on the housing component 1 of the electrical equipment in a way that prevents it from being lost.

[0054] The housing component 1, together with the retaining rib 4 and the insulating gasket 3, is made into a single plastic injection molded part. The plastic used here is electrically insulating.

[0055] The insulating gasket 3 can be used for insulation by removing it with the help of tools, especially a screwdriver.

[0056] For this purpose, an insulating pad 3 is arranged between the screw head of the metal screw 22 and the printed conductor of the circuit board 20, wherein the screw 22 is screwed into the threaded hole of the metal cooling body.

[0057] The screw passes through the insulating washer 3.

[0058] In this way, the insulating pad 3 serves to disconnect the electrical connection that originally existed between the printed wires of the circuit board 20 and the screw head of the screw 22, that is, particularly in the first variant of the electrical device, and the second variant of the electrical device is made from the first variant of the electrical device.

[0059] In the first variant, the coolant 21 is electrically grounded via screws and printed conductors, or the printed conductors are grounded via screws and the coolant 21. Conversely, in the second variant, the printed conductors are not grounded via screws and the coolant 21, or at least not at that location. Alternatively, in the second variant, the coolant 21 is not electrically grounded, particularly not via a circuit board with printed conductors.

[0060] Therefore, depending on the electrical connection, the electrical equipment can be constructed in different variations. That is, preferably, the electrical equipment is manufactured in a first variation and then supplied to a geographically different location, where it is put into operation as needed without alteration, or it is first modified to a second variation before being put into operation. Which variation should be used is determined by the AC power grid in the corresponding application. In particular, the use of an IT grid, a TN grid, or a TT grid should be considered.

[0061] Therefore, as Figure 1 and Figure 2 As shown, the manufactured electrical equipment has a housing component 1 designed as a plastic injection molded part, the housing component having a through opening 5 through the wall of the housing component 1, an insulating gasket 3 arranged in the through opening, the insulating gasket being held by retaining ribs 4, preferably by two retaining ribs 4, the retaining ribs extending into the rest of the housing component 1 at the edge of the through opening.

[0062] The housing component 1 and the cooling body 21 together constitute the housing of the electrical equipment.

[0063] Preferably, the electrical equipment is a frequency converter configured to supply power to the motor.

[0064] Viewed from the axis of rotational symmetry of the insulating pad 3, the two retaining ribs 4 are spaced apart from each other 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 ribs 4 are spaced apart in the circumferential direction by a circumferential angle of less than 120° and greater than 40°.

[0065] The insulating gasket 3 has a non-circular notch 6, which allows the tool to overload the retaining rib 4 after the tool is inserted into the notch 6 and subsequently rotated, especially tilted, and the insulating gasket to separate from the housing component 1 after the retaining rib 4 fails.

[0066] Preferably, using a screwdriver as a tool to remove the insulating gasket is particularly efficient if the screwdriver is tilted (i.e., rotated about a rotation axis intersecting the two retaining ribs) to remove the insulating gasket.

[0067] The depth of the threaded hole of the cooling body 21 is designed such that after the insulating pad 3 is placed between the printed conductor of the circuit board 20 and the screw head of the screw 22, the screw can be screwed in deep enough to press the circuit board 20 against the cooling body 21.

[0068] This means that, in the second variant, the length of the area of ​​the threaded hole of the cooling body 21 that does not contact the screw along the axis of the threaded hole is greater than the axial wall thickness of the insulating gasket 3.

[0069] In addition, the insulating pad 3 is attached to the printed conductors of the circuit board 20 and to the screw head of the screw 22, especially to the underside of the screw head of the screw 22.

[0070] A symbol 2 is formed on the outside of the housing component 1. In particular, the symbol is designed in the plastic injection mold and shows the observer the proper use of the tool in the work step of removing the insulating gasket 3 from the housing component 1.

[0071] In both the first and second variations, the insulating washer 3 is oriented coaxially with the screw 22. Specifically, the axis of rotational symmetry of the cylindrical outer periphery of the insulating washer 3 is oriented coaxially with the screw axis of the screw 22. Therefore, in the second variation, the screw 22 can be manipulated with a tool through the through opening 5.

[0072] To facilitate the reception and alignment of the screw head 22, the insulating washer has an axially projecting flange region 7 that extends uninterruptedly in the circumferential direction around the axis of rotational symmetry of the cylindrical outer periphery of the insulating washer 3. This flange region radially restricts the screw head. Otherwise, the screw 22 would have free movement due to the non-circular notch in the insulating washer 3. However, this free movement is restricted because the screw head rests against the flange region 7.

[0073] Preferably, the non-circular notch is designed as a slot or ellipse, so that the screwdriver can be easily received and engages with the insulating gasket 3 in a form-locking manner when rotated about its own axis. Alternatively, a circular, especially perfectly circular, notch can also be used, since the insulating gasket 3 can be removed by rotating the screwdriver about a rotation axis containing the two retaining ribs, or about a rotation axis oriented coaxially with the perpendicular bisector of the insulating gasket 3.

[0074] In other embodiments of the invention, a further through opening 5 is provided on the housing component, and a further insulating gasket 3 is held within the further through opening by a further retaining rib 4. Therefore, in the event that the first insulating gasket 3 is lost or damaged, a further insulating gasket 3 is available, thereby improving safety.

[0075] In other embodiments of the invention, the printed conductors of the circuit board 20 described above are electrically connected to the zero-voltage potential of the signal electronics mounted on the circuit board 20. Preferably, the zero-voltage potential is generated by a capacitive voltage divider powered by the DC voltage side connection of the rectifier, and the AC voltage side connection of the rectifier is powered by the AC power grid.

[0076] List of reference numerals in the attached diagram:

[0077] 1. Housing components

[0078] 2 illustrations

[0079] 3 insulating pads

[0080] 4. Keep the tendons

[0081] 5 through openings

[0082] 6. Non-circular notch in insulating pad 3

[0083] 7 Flange area

[0084] 20 circuit boards

[0085] 21 cooling body

[0086] 22 screws

Claims

1. An electrical device having a housing component, Its features are, The housing component has a through opening, and an insulating gasket is arranged in and / or within the through opening. The insulating gasket is held in place by at least one first retaining rib. In particular, the first retaining rib connects the insulating pad to the edge of the through opening.

2. The electrical equipment according to claim 1, Its features are, The insulating pads are radially spaced from the edges of the through openings.

3. The electrical equipment according to any one of the preceding claims, Its features are, The housing components, along with the insulating gasket and the first retaining rib, are designed as a single, integrally molded plastic part. In particular, the plastic injection molded parts are made of electrically insulating plastic.

4. The electrical equipment according to any one of the preceding claims, Its features are, The second retaining rib, spaced apart from the first retaining rib, holds the insulating gasket. In particular, The second retaining rib connects the insulating pad to the edge of the through opening.

5. The electrical equipment according to any one of the preceding claims, Its features are, The first retaining rib and the second retaining rib are spaced apart by a circumferential angle of less than 180°, particularly by a circumferential angle between 40° and 120°, the circumferential angle being referenced to the axis of rotational symmetry of the insulating gasket.

6. The electrical equipment according to any one of the preceding claims, Its features are, Insulating gaskets have notches, particularly non-circular notches, for receiving tools, especially in a non-rotational manner. In particular, In particular, to enable the tool to tilt, it is designed to be received in a non-rotatable manner with a rotation axis intersecting the two retaining ribs as a reference. And / or, Non-circular notches are designed to be elliptical or slot-shaped, especially slot-shaped or rectangular slot-shaped.

7. The electrical equipment according to any one of the preceding claims, Its features are, The insulating gasket has an axially projecting flange region that extends uninterruptedly in the circumferential direction around the rotational symmetry axis of the cylindrical circumferential outer portion of the insulating gasket, and the flange region radially restricts the screw head.

8. The electrical equipment according to any one of the preceding claims, Its features are, The notch is arranged, especially centrally, on the end side of the insulating pad.

9. The electrical equipment according to any one of the preceding claims, Its features are, The electrical device has a circuit board, through which a screw screwed into a threaded hole in the cooling body of the electrical device passes. In particular, the screw head presses against the printed conductor, or the screw head is pressed against the printed conductor by an insulating washer fitted onto the screw after being removed from the housing component.

10. The electrical equipment according to any one of the preceding claims, Its features are, The area of ​​the threaded hole that does not contact the screw covers a greater extent in the direction of the hole axis than the width of the insulating gasket in that direction.

11. The electrical equipment according to any one of the preceding claims, Its features are, The edges of the non-circular notches in the insulating gaskets are made of electrically insulating material, particularly epoxy resin-containing material, and therefore have only electrically insulating areas, with no conductive areas. And / or, The screw axis is oriented coaxially with the rotational symmetry axis of the cylindrical circumferential surface of the outer periphery of the insulating washer.

12. The electrical equipment according to any one of the preceding claims, Its features are, The screw head contacts the printed conductor on the circuit board. In particular, The screw head presses against the printed conductor. And / or, The screws and cooling elements are made of metal, as are the printed wires.

13. A method for manufacturing a second variant of an electrical device from a first variant, particularly according to any one of the preceding claims, Its features are, In particular, in order to create a second variant from a first variant, In the first method step, By breaking the retaining rib, the insulating gasket is separated from the housing component. - Retained by a first retaining rib connected to the housing component of the first variant, - Oriented coaxially with the screw axis, the screw presses the circuit board onto a metal cooling element and is screwed into the threaded hole of the cooling element. The screw head presses an insulating washer against the printed conductors of the circuit board. In the second method step, which is performed after the first method step in time, the screw is unscrewed from the threaded hole. In the third method step, which is performed after the second method step, a screw made of metal is passed through a non-circular notch in an insulating washer and screwed into a threaded hole in a cooling body, thereby pressing the insulating washer against the printed conductors on the circuit board. In particular, the electrical connection between the screw and the printed conductors is broken by means of the insulating washer.

14. The method according to any one of the preceding claims, Its features are, In the first variant of the electrical equipment, the printed conductors of the circuit board are connected to the cooling body, and in particular, to the protective conductor and / or the electrical grounding terminal. In the second variant of the electrical equipment, the printed conductors on the circuit board are electrically isolated from the cooling body by means of insulating pads, and in particular, electrically isolated from the protective conductor and / or the electrical grounding terminal. In particular, in the first variant, the cooling body at least partially constitutes the shell, and in the second variant, the cooling body at least partially constitutes the shell.

15. A series of electrical devices manufactured according to the method of any one of the preceding claims, Its features are, The electrical equipment series has a first variant and a second variant.

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