Cable entry device and structure for switchgear and method for operating the same

Abstract

In order to simplify the equipment of a switchgear (1) at low cost, a cable entry device (2, 2', 2") is proposed which essentially consists of an open frame part (23, 23', 23") and at least one sealing insert (22, 22') arranged therein. This cable entry device (2, 2', 2") is mounted to a switchgear opening (10) in such a way that its sealing insert (22, 22') and its frame part (23, 23', 23") are flush with the switchgear opening (10). When the switchgear (1) is closed, for example with a switchgear door or a switchgear wall (11), the switchgear door seals against the cable entry device (2, 2', 2") with a counter-sealing (113). In order to replace a cable, it is only necessary to open the switchgear door / switchgear wall (11) and to remove the cable to be replaced together with the corresponding sealing element (2), and to equip the new cable with and to insert it into a matching sealing element (2).

Description

TECHNICAL FIELD

[0001] The present application is based on a cable entry device.

[0002] Furthermore, the present application relates to a switchgear structure having a switchgear and a cable entry device.

[0003] Furthermore, the present application also relates to a method for operating a switchgear structure.

[0004] Such a device, structure and method are required in order to introduce a cable into a switchgear, to fix the cable stress-relieved on the switchgear and to seal the cable in its entry region. BACKGROUND

[0005] In the prior art, cable entry devices for switchgears are known, for example, from the Wikipedia entry https: / / de.wikipedia.org / wiki / Kabeleinführung.

[0006] The document EP 2746634 A1 discloses a similar cable holder having a U-shaped frame and a plurality of sealing inserts for passing through cables ("bushings" Tüllen). The cable holder has a U-shaped frame with two legs and a web connecting the two legs to one another. Furthermore, the cable holder has a plurality of sealing inserts. Each of these sealing inserts has at least one hole for passing through a cable. Furthermore, the cable holder also has a locking pin which, in the installed state, connects the two legs to one another and exerts pressure on the sealing inserts equipped with cables. Starting from the prior art, the document proposes that the locking pin and / or the frame are formed from an elastic material, wherein the two ends of the locking pin and the free ends of the legs have recesses or protrusions which form a snap connection with one another.

[0007] Furthermore, in the prior art, it is known to modify an attachment housing from the field of heavy-duty plug connectors so that it is suitable as a cable entry device for a switchgear.

[0008] The document EP 2845277 B1 discloses a through housing for one or more cables. The through housing has a housing lower part which is designed to be arranged on a switchgear housing, and furthermore has a housing upper part. The latter can be brought from an open state, in which the housing upper part is not fixed on the housing lower part, into a closed state, in which the housing upper part is fixed on the housing lower part and, in particular, sealingly covers the housing lower part. At least one cable through sealing for accommodating, in particular, a prefabricated cable is provided in the housing lower part. Furthermore, the through housing comprises a stress relief for at least one cable. It is furthermore disclosed that a cable through sealing and a stress relief are also arranged in the housing upper part.

[0009] The disadvantage of this construction form is that experience has shown that the sealing properties between the cable feed-through seals on both sides and the annular seals which are usually and necessarily used for sealing between the housing parts are significantly worsened due to the so-called "T shape" of this overall sealing structure. Furthermore, for the cables held in the housing upper part, a certain cable elongation occurs upon closure of the upper part in the switchgear cabinet. The overall structure is therefore not only technically disadvantageous, but also relatively complex and expensive.

[0010] In order to achieve an improvement in the handling and sealing, the document DE 102 016 114 577 A1 proposes on the inner side of the preferably one-piece attachment housing the installation of separate stress-relieving elements, like for example cable clamps or cable ties. These stress-relieving elements can be manipulated through installation windows provided on the opposite sides of the housing. By closing the windows with a cover, the sealing elements are compressed and the cables are sealed against the attachment housing.

[0011] The disadvantage of all these known constructions is that their construction and use is very complex. They have a large number of expensive parts and the installation time is unacceptably long. Furthermore, the replaceability of the cables with the associated seals on site becomes complex and difficult.

[0012] In the priority application of the present application, the following prior art documents were retrieved by the German Patent and Trademark Office: EP 0 560 119 A1, DE 42 07 281 C1, ES 2 167 149 A1, DE 102 016 114 577 A1, EP 2 845 277 B1 and EP 2 746 634 A1. SUMMARY

[0013] It is the object of the present application to propose a simple and practically operable cable feedthrough for a switchgear cabinet and furthermore to propose a switchgear cabinet construction and a method which simplify the equipment of a switchgear cabinet. In particular, the subsequent replacement of cables fed into the switchgear cabinet should be made easy.

[0014] A cable entry device for a switchgear has a rigid frame part, i.e. a frame part made of a rigid material, for example. The frame part has a mounting face for fastening on a switchgear wall provided as a mounting wall in the region of a wall borehole provided for the entry of a cable into the switchgear. Depending on the design of the switchgear and depending on the respective requirements, the mounting wall can be a side wall or a front wall and / or a rear wall of the switchgear, which is constructed rationally and is therefore advantageous for the respective application. The frame part has a mounting seal on its mounting face for sealing the mounting wall of the switchgear. The mounting seal can be formed by a sealing face, for example, such as an appropriately cut rubber membrane, for example. Alternatively or additionally, however, the mounting seal can also have a seal which is held and guided in a sealing groove of the mounting face, wherein the sealing groove surrounds the sealing recess three-sidely.

[0015] Accordingly, in principle, the face of the frame part in and / or on which the mounting seal is arranged can be regarded as the mounting face. The frame part has a side face opposite the mounting face.

[0016] The frame part also has a fastening device, such as a threaded through-hole with an associated screw, or also a quick fastening device, which will be described in detail below, for fastening, in particular screwing, the frame part at the mounting wall or at any other fastening device present in the switchgear in the vicinity of the mounting wall, in particular at a screwing device, for example at a fastening rail or the like, in order to be fastened in or on the switchgear.

[0017] In an advantageous embodiment, the threaded through-hole for this purpose starts in particular on the side face and extends through the frame part and ends on the mounting face of the frame part. The frame part can be screwed on the mounting wall of the switchgear, for example, by means of a screw introduced into the threaded through-hole, from the inside or from the outside.

[0018] As already indicated, in an alternative embodiment to this, instead of a screw connection, the quick fastening device can also be used as a fastening device as follows:

[0019] For this purpose, at least one, preferably a plurality, in particular two, in particular rectangular, latching windows can be provided on the frame part as well as on the mounting wall. The latching windows of the mounting wall can correspond in size and shape to the latching windows of the frame part and for their mutual fastening directly above one another in the installation.

[0020] In a preferred embodiment, the frame part can have at least one, preferably a plurality, in particular two, fastening flanges, in which one of the latching windows of the frame part is respectively arranged.

[0021] Furthermore, for the purpose of securing the frame part, at least one, preferably a plurality, in particular two, quick-securing devices are provided. These quick-securing devices each have a latching housing which can preferably be passed through a latching window in a form-locked manner.

[0022] Furthermore, the quick-securing devices have latching means, for example latching hooks which are spring-mounted in the latching housing, which latching hooks each have a sliding ramp and a latching face which is preferably at an acute angle to the sliding ramp. Thus, when the latching housing is passed through the mutually superimposed latching windows of the frame part and the mounting wall, the latching hooks can first of all be pushed into the latching housing by means of their sliding ramps against the spring force. However, owing to the restoring force of the latching spring, the latching hooks are pressed outwards in the fully inserted state, i.e. in the mounted state, by the latching spring and engage with their latching faces behind the latching window of the mounting wall for the purpose of the final mechanical securing of the frame part on the mounting wall. The latching connection housing can preferably have a stop face, for example a surrounding stop flange, on the frame part side, with which stop flange it is pressed against the frame part, in particular against a flange of the frame part, in the mounted state.

[0023] The latching face of the latching hook, which then presses against the mounting wall from the opposite side of the latching window, does not necessarily have to extend parallel to the stop face, in particular the stop flange, here. Instead, it can advantageously have an angle to the stop flange which is slightly greater than 0°, preferably greater than 2.5° and in particular greater than 5°. Then, by means of the restoring force of the latching spring, the stop face, in particular the stop flange, and thus the corresponding securing flange of the frame part is pulled towards the mounting face by the latching hook and the frame part is held in this way in a force-locked manner on the mounting wall.

[0024] With this latching securing means, the attachment housing can advantageously be mounted on the device wall without tools. For easy removal, these latching securing means can be removed again from the device wall simply by means of a release tool: for example, the release tool can be an L-shaped release pin which is introduced with its tip into a release opening of the latching housing and is manipulated, for example turned, at its right-angled projecting lever region, whereby a mechanism is manipulated in the latching housing by means of which the latching element can be sunk again into the latching housing against the spring force in order to release the securing.

[0025] In a further embodiment, the at least one quick-securing device can be an integral part of the frame part, for example its latching housing and its stop flange are implemented in one piece with the frame part, whereby the quick-securing device is firmly connected with the frame part. In this case, the frame part itself of course does not require a latching window.

[0026] Here, a mounting seal arranged on the mounting face of the frame part, depending on the attachment side from the inside or from the outside, is pressed against the corresponding mounting wall of the switchgear cabinet, wherein the mounting seal in one advantageous refinement surrounds the wall perforation provided for the cable feed-through at least three-sidely.

[0027] In one preferred embodiment, the frame part can have a square basic shape. The mounting face and the side faces of the frame part can then extend parallel to one another and each have a rectangular basic shape. They can then be connected to one another by four essentially rectangular edge faces of a cuboid. The term "essentially" can mean here, for example, that at least one of the edge faces is interrupted by at least one recess.

[0028] In particular, the mounting face and the side faces can be formed by one of the edge faces of the cuboid by a front face oriented at right angles thereto. In the mounted state, it is arranged at least in the vicinity of the switchgear cabinet opening, in particular directly thereon. The front face is flat. Thereby, the front face can be flush with the free edge of the mounting wall on which it is mounted in the mounted state and thereby also with the switchgear cabinet opening.

[0029] Here and in the following, it is clear to the person skilled in the art that the terms "flatly" and "planarly" and in particular "flushly" are to be understood within the usual manufacturing and mounting tolerances and elasticities of the respective component.

[0030] The frame part also has at least one, preferably a plurality of recessed U-shaped sealing recesses starting on the front face thereof and extending into the frame part. Thereby, the front face of the frame part is interrupted in the region of the at least one sealing recess.

[0031] The cable feedthrough device also has at least one elastic sealing insert. The sealing insert has a convex U-shaped insertion profile which is complementary to the sealing recess and thereby engages form- and force-locked into the corresponding sealing recess of the frame part.

[0032] Each sealing insert has at least one continuous cylindrical cable feed-through opening and a feed-in slit for feeding a cable into the cable feed-through opening. Furthermore, each sealing insert has a planar closure face at the side not enclosed by its convex U-shaped insertion profile, the feed-in slit preferably extending through the closure face. Alternatively, however, the feed-in slit can also extend through the insertion profile.

[0033] When the sealing insert is finally inserted into the frame part, the closure face of the sealing insert is flush with the front face of the frame part. The front face of the frame part and the closure face of the sealing insert then form a flat, continuous pressure face within the usual manufacturing tolerances and elasticities.

[0034] By virtue of this, the front face of the frame part and the closure face can be sealed simultaneously and with a particularly high sealing effect by means of the linearly extending counterseal, by pressing the counterseal flat against the pressure face.

[0035] In an advantageous embodiment, the sealing properties of the planar pressure face can be improved by the frame part having additional recesses, in particular linear positioning recesses, at least in its front face on both sides of its U-shaped sealing recess. In a preferred embodiment, the two positioning recesses can also consist of or be connected by a circumferential groove arranged in the entire sealing recess.

[0036] The sealing insert has a complementary positioning profile which, when the sealing insert is inserted into the frame part, can be placed at least partially form-lockingly, in particular form- and force-lockingly, into the positioning recess. This serves, on the one hand, to position the respective sealing insert as precisely as possible, i.e. its correct orientation and correct position in the frame part, which is an advantage in itself.

[0037] A further particularly important advantage is, furthermore, that in a preferred refinement the additional recesses / positioning recesses of adjacent sealing recesses can directly adjoin one another in the front face of the frame part, so that the sealing recesses are also connected to one another by the recesses in the front face. If the sealing elements are subsequently, i.e. finally, inserted into the frame part, they adjoin one another directly with their likewise correspondingly elongated positioning profiles and can thus also form a continuous seal on the frame side. At the same time, as already mentioned, they are naturally flush with the front side of the frame part. By this arrangement, the sealing effect can be significantly improved once again.

[0038] In any case, a planar pressure face is formed on the cable entry device by the front face of the frame part and the closure face of the sealing insert, which pressure face can be sealed by means of a linearly extending counterseal in such a way that the counterseal is pressed flat against the pressure face.

[0039] For this purpose, the counterseal can be mounted on a linear, in particular planar, object, in particular on a switch cabinet closure element. The switch cabinet closure element is explained in more detail below and serves to seal the switch cabinet. The switch cabinet closure element can be formed, for example, in a closable switch cabinet door, a clip-on switch cabinet cover and / or a screwable sheet, for example a front wall.

[0040] The switch cabinet closure element can be pressed against the pressure face, i.e. against the closure face of the at least one sealing element and against the front face of the at least one frame part arranged on the switch cabinet opening, with the counterseal preferably mounted thereon.

[0041] A switchgear structure has a switchgear which has a plurality of switchgear walls, in particular a plurality, preferably four, side walls, a front wall and a rear wall - hereinafter installation wall. The installation wall is characterized in that it has a wall perforation / plurality of wall perforations for the passage of a cable to be introduced.

[0042] The plurality of switchgear walls, for example four side walls or three side walls and one rear wall, each has an independent edge in the open state of the switchgear. These independent edges together form a switchgear opening. One of the plurality of switchgear walls is an installation wall. The installation wall is characterized in that it has a wall perforation. The wall perforation is arranged in the installation wall in the vicinity of its independent edge, i.e. in the vicinity of the switchgear opening. The wall perforation can in particular be implemented as open, i.e. directly on the independent edge of the installation wall and thus directly on the switchgear opening.

[0043] The switchgear opening can generally be used to manually equip and wire the switchgear by a corresponding trained specialist. When the switchgear is equipped and wired, the switchgear opening - and thus the entire switchgear - must be closed in a watertight manner. To this end, the switchgear has the aforementioned switchgear closure element.

[0044] As already mentioned, such a switchgear closure element can for example be a side wall which is not part of the group of the plurality of switchgear walls forming the switchgear opening, or also a front wall or a rear wall. In particular, the switchgear closure element can be implemented in the form of a switchgear door which can be closed over the switchgear opening, for example, and / or in the form of a metal plate which can be screwed onto the switchgear at the switchgear opening and / or in the form of a switchgear cover which can be latched on the switchgear opening, etc.

[0045] In a preferred embodiment, the switchgear closure element is a side wall of the switchgear. For example, the rear wall can then be provided as the installation wall.

[0046] The at least one cable introduction device can be mounted on the switchgear either internally, i.e. "from the inside", or externally, i.e. "from the outside". In particular, the cable introduction device can be mounted internally or externally at the wall perforation on the installation wall and with its installation seal sealingly pressed against the installation wall of the switchgear.

[0047] The pressure surface of the cable introduction device can be arranged on the independent edge of the installation wall and parallel to the independent edge of the installation wall and thus adjoin, i.e. flush with, the switchgear opening.

[0048] By this it is possible to press the switch cabinet closure element against the pressure face, that is to say at the same time against the front face of the frame part and against the closure face of the sealing insert, and thus to seal it off during the closure process with the linearly extending counterseal mounted on the switch cabinet closure element. At the same time, the mounting face of the frame part is pressed against the mounting wall of the switch cabinet with its mounting seal. Here, the cables introduced into the switch cabinet pass through at least one wall perforation present in the mounting wall and sealed off by the mounting seal and likewise sealingly and in addition to some extent stress-relieving extend through the cable passage opening of the respective sealing insert. The entire switch cabinet is thus closed off and sealed by the closure of the switch cabinet closure element.

[0049] Depending on the construction form of the switch cabinet, for particularly intensive sealing it can be meaningful to mount a separate counterseal on the switch cabinet closure element for the cable introduction device, or to use as a counterseal, for example for cost reasons, a seal already present on the switch cabinet closure element, that is to say already provided according to the standard.

[0050] A method for operating such a switch cabinet construction, with the following steps:

[0051] A. The at least one cable introduction device is fixed with its frame part from the inside or from the outside in the region of the associated wall perforation arranged in the mounting wall of the switch cabinet to the mounting wall and directly to the switch cabinet opening of the switch cabinet, so that the front face of the at least one frame part is flush with the free edge of the mounting wall and thus also with the switch cabinet opening of the switch cabinet;

[0052] B. At least one cable is inserted into the respective matching sealing insert;

[0053] C. The at least one sealing insert is inserted form- and force-locked into the respective one sealing recess of the at least one frame part, so that the closure face of the at least one sealing insert is flush with the front face of the frame part;

[0054] D. The switch cabinet opening of the switch cabinet is closed with the switch cabinet closure element, wherein the linearly extending counterseal fixed thereon is sealingly pressed by the switch cabinet closure element against the pressure face of the cable introduction device.

[0055] The cable introduction device essentially consists of only a few, and in addition cost-effective, components. Thus, in an advantageous embodiment, the cable introduction device only needs to comprise a frame part, for example made of injection-moulded plastic, into which one or more sealing inserts, for example made of rubber, rubber material and / or silicone, are inserted. Its manufacture is thus particularly simple, which is particularly advantageous for its production.

[0056] Thus, a particular advantage of the present application is that the cables can be inserted into the switchgear cabinet without tools during mass production. In particular, the installation of the cables can be carried out without tools. Here, the final sealing of the cable entry can be carried out automatically, in particular by simply closing the switchgear cabinet door.

[0057] Thus, a further advantage of the present application is the simple operability. The installation comprises only the installation of one or more frame parts in the switchgear cabinet and the insertion of the cables with the sealing inserts in the correct length.

[0058] An additional advantage is that, when different cross sections / numbers of cables are required in the switchgear cabinet, for example, the cables can be added later or replaced by other cables with only minimal outlay.

[0059] A particularly great additional advantage of the present application is that in this way a particularly large number of cables can be introduced into the switchgear cabinet. Finally, contrary to the known prior art, the present application makes the entire edge length of the switchgear cabinet opening available for equipping the cables. This can - depending on the design of the switchgear cabinet - have a plurality of cable entries each with a plurality of sealing inserts. It is particularly advantageous here that the number of cables that can be introduced is thus automatically matched to the size of the switchgear cabinet.

[0060] In addition, frequent changes and alterations of the equipment of the switchgear cabinet (and thus also of the wiring) can also be carried out quickly and easily with as little outlay as possible.

[0061] Contrary to the known arrangements in the prior art, the locking of the cable entry is not carried out by separate cable entry elements, like for example separate locking pins. Thus, the need for such locking pins for locking the frame parts and for force-locked fixing of the sealing inserts by the cable entry is eliminated. This simplifies the installation and reduces the manufacturing costs of the cable entry from a product point of view. Instead, the cable entry is locked in a cost-effective manner by the common switchgear cabinet locking elements which are provided in the prior art anyway for locking the switchgear cabinet, but which obtain the following additional application by the cable entry:

[0062] When the switchgear cabinet is locked, the switchgear cabinet locking element can thus be pressed against at least one sealing insert of at least one cable entry in order to seal, in particular by its counter-sealing. The sealing insert can thus be compressed slightly, whereby the sealing insert can also fix and seal at least one cable passing through. Here, both functions are fulfilled at the same time by means of a single action, namely closing the switchgear cabinet locking element, for example the switchgear cabinet door.

[0063] A.) closing and sealing the switchgear cabinet, and

[0064] B. ) the cable introduction device is closed to seal it from the outside in order to seal the cables passing through in it and in particular also to secure the cables passing through in it.

[0065] In an advantageous embodiment, the at least one sealing insert can have at least one, preferably two flanges arranged on both sides of its closure face for contacting the countersealing on at least one side and in particular for surrounding the countersealing on both sides. In this case, it is particularly advantageous in a preferred embodiment that the countersealing is pressed into at least one of the flanges and in particular engages form- and force-locked between the two flanges while it is pressed against the closure face, because the countersealing can thus act together with the sealing insert particularly well as a seal.

[0066] In an advantageous embodiment for reasons of compatibility, the cable introduction device can have a plurality of sealing inserts with identical outer contours to one another and the frame part can have a plurality of sealing recesses identical to one another. In this case, the "outer contour" of a sealing insert is formed by its sealing contour and the contour of its closure face.

[0067] Furthermore, in another preferred embodiment, at least two of the sealing inserts can differ in the number and / or diameter of the cable passage openings. Thereby, cables with different cross sections can benefit from the advantages of the cable introduction device. Furthermore, the sealing inserts can also be used for passing through a plurality of cables, preferably cables with a smaller cross section, which advantageously meets the basic requirement of an increasing number of cables to be introduced into the switchgear cabinet.

[0068] At least one of the sealing inserts can have at least on one side a particularly circularly surrounding retaining collar on its at least one cable passage opening for increasing the retaining force for securing the cable passing through. The outer diameter of the surrounding retaining collar can increase towards its independent end region. In particular, the retaining collar can be embodied funnel-shaped, i.e. for example have a funnel. By means of the increase of the outer diameter, the cable passing through can be secured with a particularly high retaining force on the sealing insert by means of a ring-shaped securing element, for example a screwable clamp and / or a cable tie or the like, for stress relief, wherein the ring-shaped securing element is prevented from undesirably loosening from the retaining collar. The retaining force of the stress relief already present can thereby be significantly increased.

[0069] In a preferred embodiment, the at least one sealing insert can have a particularly advantageous Shore hardness of 30 to 40. Such a Shore hardness has the advantage that the sealing insert has a relatively high elasticity, whereby it particularly advantageously solves the following problems:

[0070] On the one hand, the closure face should be designed to be particularly planar in order to avoid a gap between the cable introduction device and the straight mating seal. On the other hand, however, it should also ensure the handling of tolerances related to the design of the cable cross section. In practice, the diameters of the cables used can have deviations, wherein these deviations, depending on the cable thickness, can be between 1.5 mm and 2 mm, for example. Thus, for a sealing insert with only one cable passage opening, which is usually provided for thicker cables, a tolerance of approximately 2 mm can be expected. In a density insert with multiple cable passage openings, which necessarily have a smaller diameter, a deviation of approximately 1.5 mm is more likely to be expected. Thus, for the sealing, a relatively high elasticity and thus a Shore hardness of 30-40 is meaningful.

[0071] In many cases, at least one sealing insert should also ensure sufficient stress relief of the cables passing through without the use of the annular securing element.

[0072] To this end, in a further advantageous embodiment, the sealing insert can have at least one inner, so-called sealing rib, that is to say, for example, an inner circumferential bulge, inside its at least one cylindrical cable passage opening. This is particularly useful in terms of its particularly high elasticity, since this high elasticity generally first of all reduces the holding force on the cables passing through, which is advantageously compensated again by the presence of one, preferably multiple, such sealing rib. Furthermore, the presence of multiple sealing ribs instead of only one sealing rib has the advantage that the holding force is generally not only increased, but also the sealing effect, with respect to the use of only one sealing rib. BRIEF DESCRIPTION OF DRAWINGS

[0073] Embodiments of the application are shown in the drawings and explained in detail below. Shown therein are:

[0074] Figures la-le A switchgear cabinet with multiple cable introduction devices is shown in different views;

[0075] Figures 2a-2d A first cable introduction device with a frame part and a sealing insert is shown in different views;

[0076] Figures 2e-2f A sealing insert as a separate part is shown in different views;

[0077] Figure 3a A second frame part as a separate single part is shown;

[0078] Figures 3b-3c A second cable introduction device with a second frame part and four different sealing inserts is shown in different views;

[0079] Figure 3d, 3e Second cable entry device with changed equipment shown in different views;

[0080] Figure 3f Second cable entry device with mating seal shown;

[0081] Figure 4a Single changed sealing insert shown; and

[0082] Figure 4b Third cable entry device with three changed sealing inserts shown.

[0083] The drawing comprises partly simplified schematic illustrations. Partly, the same reference signs are used for identical, but if necessary not identical, elements. Different views of identical elements can be scaled differently. DETAILED DESCRIPTION

[0084] Figures la-le A switchgear structure composed of a switchgear 1 is shown, which has a plurality of externally screwed cable entry devices 2, 2', namely a first cable entry device 2 and a second cable entry device 2'. It is noted here that this illustration is schematic and only describes the basic construction of the switchgear structure as intuitively as possible. In other, particularly realistic designs, the side length of the switchgear opening can also be implemented significantly larger than in the shown switchgear opening 10, whereby significantly more space is also present for the installation of further cable entry devices 2, 2'.

[0085] In Figure la , the switchgear 1 is shown in a perspective view perpendicular to its rear wall 13, to which the cable entry devices 2, 2' are externally screwed.

[0086] Furthermore, the switchgear 1 has four side walls 11, 11', 11'', 11''', of which a first side wall 11 in Figure lb can be seen particularly well and serves as a switchgear latching element, namely in this illustration latches the switchgear opening 10.

[0087] Figure lc A top view through a cross section of the first cable entry device 2 is shown. It can be clearly seen here how the first side wall 11 projects beyond the rear wall 13 in order to sealingly press against the latching face 223 of the sealing insert 22 of the cable entry device 2.

[0088] In Figure IdThe switchgear opening 10 can be seen, since the first switchgear wall 11 is removed. Through the switchgear opening 10 the inner side of the front wall 12 of the switchgear 1 is exposed. It can also be seen particularly well from this view that the cable lead-throughs 2, 2' are respectively mounted at a lateral wall perforation of the rear wall 13, which wall perforation is located directly at a separate edge of the rear wall 13, whereby the wall perforation is embodied open towards the switchgear opening 10.

[0089] Figure le The same structure of the switchgear opening 10 is shown in a vertical view.

[0090] The rear wall 13 of the switchgear 1 serves as mounting wall in this design. The rear wall 13 therefore has lateral wall perforations in the area of which respectively the cable lead-throughs 2, 2' are mounted, in this case from the outside. In an alternative design, however, the same cable lead-throughs 2, 2' can also be mounted to the rear wall 13 from the inside, i.e. within the switchgear 1. The sealing of the cable lead-throughs 2, 2' and thus also the final sealing of the switchgear 1 is achieved by the closure of the switchgear 1 by means of the first side wall 11.

[0091] In other switchgear designs, which are not shown here, however, the same cable lead-throughs 2, 2' can also be arranged, for example, on the wall perforations of the side walls and be sealed by the rear wall or, alternatively, by the front wall by its closure. In this way, the rear wall or the front wall respectively has the function of the switchgear closure element, while the side wall with the wall perforation serves as mounting wall.

[0092] The cable lead-throughs 2, 2', 2'' described in detail below are advantageously independent of this and can therefore also be used extremely flexibly on the aforementioned basically very different types of switchgear.

[0093] Figures 2a-2d The first cable lead-through 2 is shown in four different views. The first cable lead-through 2 has a frame part 23 with only a single sealing recess 236 and accordingly also only a single sealing insert 22.

[0094] Figure 2a The first cable lead-through 2 is shown in a lateral cross-section. It can be clearly seen in this illustration that the sealing insert 22 has a retaining collar 221 with a funnel 222 at its cable passage opening 220.

[0095] Figure 2b A side view of the first cable lead-through 2 is shown, i.e. the unlabelled side of its frame part 23 is observed. The frame part 23 has a cavity on this side for reasons of manufacturing technology.

[0096] The frame part 23 also has a flat front face 233 which is arranged at right angles to the side face. This front face 233 is interrupted by a recessed U-shaped sealing recess 236 which extends from the front face 233 into the frame part 23.

[0097] Furthermore, the sealing insert 22 which engages in a positive, U-shaped manner into the sealing recess 236 has a planar closure face 223 which is flush with the front face 233 of the frame part 23. Furthermore, the sealing insert 22 has a through-going cylindrical cable passage opening 220 and an introduction slit 227 for introducing a cable into the cable passage opening 220.

[0098] As a fixing device, the frame part 23 has a plurality of, in this design two, threaded through-holes 230 which extend in the direction of the side face, i.e. in the direction of view in Figure 2b

[0099] In another design, instead of by means of the aforementioned screw connection, the fixing of the frame part 23 at the mounting face of the switchgear cabinet 1 can also be carried out in the form of a quick fixing technology, i.e. by means of one or more quick fixing devices which are not shown in the drawings, however.

[0100] Figure 2c The cable introduction device 2 is shown in a top view.

[0101] Figure 2d An oblique top view of the side face of the cable introduction device 2 which is not provided with reference numerals is shown. The frame part 23 has an also not provided with reference numerals mounting face in the opposite side face which is provided for mounting on a mounting wall, i.e. in this design on the rear wall 13 of the switchgear cabinet 1. In the mounting face of the frame part 23, a three-sided surrounding mounting seal 238 is provided which is shown here only schematically and in a slightly modified form in the subsequent Figure 3d and 3e can be seen particularly well.

[0102] Figure 2e and 2f The sealing element 22 is shown as a separate part. The retaining collar 221 and the funnel 222 of the sealing element 22 can be seen particularly well in Figure 2e On the annular surrounding retaining collar 221, an annular fixing element can be arranged which is not shown in the drawings. In one design, the annular fixing element is a screwable clamp. In another design, it is a cable tie. The fixing element serves to increase the holding force when fixing a cable which is also not shown which passes through the cable passage opening 220.

[0103]

[0104] ​​By means of the funnel portion 222, the diameter of the retaining collar 221 increases towards its free end region. By this, a not shown annular securing element can be held without loss at the retaining collar 221.

[0105] Figures 3a-3f A second cable entry device 2' is shown.

[0106] To this end, in Figure 3a A second frame part 23' is shown as a separate single piece. This second frame part 23' has four uniform sealing recesses 236 of the aforementioned type. Between the sealing recesses 236 the front face 233 is visible. In other words, the front face 233 is interrupted several times by the sealing recesses 236. Positioning recesses 234 are arranged at each sealing recess 236. In this case, the positioning recesses extend as grooves through the entire inner edge of the concave U-shaped sealing recess 236 and are arranged with their ends in the front face 233.

[0107] Then, as Figure 3b and 3c is shown, different sealing inserts 22 can be inserted into the sealing recesses 236.

[0108] The sealing inserts have at least at their closure face 224 at least one, in this case a positioning contour 224 which surrounds their insertion contour. In order to precisely position the sealing inserts 22 accordingly, the positioning contour 224 engages at least form-fittingly, and in particular form-fittingly and force-fittingly, in the corresponding positioning recess 234 of the corresponding sealing recess 236.

[0109] Although the four sealing inserts 22 shown here differ in the size and / or number of their cable passage openings 220 and in the length of their entry slits 227, they are provided with the same reference numerals, since they are identical to one another and furthermore also have a similar function.

[0110] Figure 3d and Figure 3e A second cable entry device 2' is further shown, but with the difference that some of the sealing inserts 22 are exchanged compared to the previously shown figures or replaced by other sealing inserts 22.

[0111] Since these sealing inserts 22 have the same basic shape as one another, that is to say the same U-shaped insertion contour and the same closure face 223, and furthermore the sealing recesses 236 of the frame parts 23, 23', 23'' are also congruent with one another, these sealing inserts 22 can be exchanged arbitrarily with one another according to requirements, which is of course extremely advantageous for reasons of compatibility.

[0112] It is also clearly visible in both illustrations that the already briefly mentioned mounting seal 238 of the frame part 23. The mounting seal 238 is held in a U-shaped sealing groove on the mounting side and three-dimensionally surrounds the sealing recess 236. The mounting face is defined by the mounting seal 238, i.e. the outer surface of the frame part 2' which is arranged with the mounting seal 238 is considered the mounting face.

[0113] Finally, the frame part 23 is arranged so that its mounting face and thus also its mounting seal 238 sealingly presses against the mounting wall in the area of the respective wall perforation, i.e. in this case against the rear wall 13 of the switchgear cabinet 1.

[0114] Figure 3f It is shown that the cross section of the second cable lead-through device 2' in its attached and sealed state on the switchgear cabinet 1, viewed from the direction of the switchgear cabinet locking element, i.e. in this case the first side part 11, penetrates the linearly extending counter seal 113.

[0115] Here, it can easily be considered how the counter seal 113 can be pressed against the flat pressure face of the cable lead-through device 2' by locking the switchgear cabinet with the aid of the switchgear cabinet locking element, i.e. in this design with the side wall 11, wherein the pressure face is formed by the front face 233 of the frame part 23 and the locking face 223 of the sealing insert 22.

[0116] In the shown illustration, the counter seal 113 is narrower than the pressure face. But in another design, the counter seal 113 can also be as wide as the locking face 223 of the sealing insert 22.

[0117] In Figure 4a A slightly changed sealing insert 22' in a slightly changed embodiment is shown in. This sealing insert has a particularly high sealing effect. The sealing insert has one linearly extending flange 229 on each side of the locking face 223. If now, as described above, the counter seal 113 is as wide as the locking face 223, the counter seal can be form- and in particular also form- and force-locked engaged between the two flanges 229 and pressed against the locking face 223, whereby the quality of the seal is significantly improved. However, even if the counter seal 113 is brought into contact with only one of the two flanges 229 on one side, a significant improvement in the sealing effect occurs.

[0118] Furthermore, like the aforementioned sealing insert 22, this changed sealing insert 22' has two sealing ribs 202 inside its cable through opening 220. Thereby, when the sealing insert 22' is composed of a particularly resilient material, for example a material having a Shore hardness of 20-30, a sufficient holding force for the passing cable is also ensured.

[0119] Furthermore, the positioning formations 224' are slightly elongated in relation to the above-described design at least in the region of the closure face 223.

[0120] It can be seen from Figure 4b the following with regard to the side of the third embodiment of the frame part 23'' of the third cable entry 2'':

[0121] In the front face 233 of the third frame part 23'', the positioning recesses 234' are enlarged in relation to the above-described embodiment and directly adjoin one another. The positioning formations 224' of the sealing inserts 22' which adjoin one another thereby also directly adjoin one another in the installed state, which achieves a particularly strong seal in the sealed state, i.e. when the countersealing 113 presses against it.

[0122] Even if different aspects or features of the application are shown in the figures in combination with one another, it is apparent to the person skilled in the art, if not stated otherwise, that the shown and discussed combinations are not the only ones possible. In particular, mutually corresponding units or feature complexes consisting of different embodiments can be exchanged for one another.

[0123] List of reference signs

[0124] 1 switch cabinet

[0125] 11, 11', 11'', 11''' side wall

[0126] 12 front wall

[0127] 13 rear wall

[0128] 2, 2', 2'' cable entry

[0129] 22, 22' (modified) sealing insert

[0130] 220 cable passage opening

[0131] 221 retaining collar

[0132] 222 funnel portion

[0133] 223 closure face

[0134] 224, 224' positioning formation

[0135] 227 entry slit

[0136] 229 flange

[0137] 23, 23', 23'' frame part

[0138] 230 threaded through-hole

[0139] 233 front

[0140] 234, 234' positioning recesses

[0141] 236 sealing recesses

Claims

1. Cable inlet device (2, 2', 2") for a switchgear cabinet (1), having a rigid frame part (23, 23', 23") which, for its fixing in the switchgear cabinet (1), has fixing means, wherein the frame part (23, 23', 23") having, on the one hand, a mounting face with a mounting seal (238) for sealing the switchgear cabinet wall (13) provided as a mounting wall for this purpose, and wherein the frame part (23, 23', 23") has, on the other hand, a side face opposite the mounting face, wherein the mounting face and the side face are connected to one another by a front face (233), wherein the front face (233) extends flat in order to lie flush, in the mounted state, with a free edge of the mounting wall (13) at a switchgear cabinet opening (10) of the switchgear cabinet (1), wherein the frame part (23, 23', 23") has at least one concave U-shaped sealing recess (236) which begins at the front face (233) and extends into the frame part (23, 23', 23"), and wherein the cable inlet device (2, 2', 2") further has at least one resilient sealing insert (22, 22') which can be inserted form-fitting and force- fitting into the corresponding sealing recess (236) of the frame part (23, 23', 23") in its complementary convex U-shaped insertion profile, wherein the at least one sealing insert (22, 22') has at least one continuous cylindrical cable passage opening (220) and one introduction slit (227) each for the introduction of a cable into the cable passage opening (220), and wherein each sealing insert (22, 22') further has one flat closure face (223), wherein the closure face (223) of the at least one sealing insert (22, 22') lies flush, in its inserted state, with the front face (233) of the frame part (23, 23', 23"), wherein a counter-seal (113) is pressed by means of a switchgear cabinet closure element (11) against the closure face (223) and the front face (233).

2. Cable inlet device (2, 2', 2") according to claim 1, wherein the at least one sealing insert (22, 22') has one flange (229) each on both sides of its closure face (223), which flanges extend linearly along a first longitudinal side of the frame part (23, 23', 23") in the inserted state, wherein the counter-seal (113) engages form-fitting between the two flanges (229).

3. The cable entry arrangement (2, 2', 2") according to any of the preceding claims, wherein The cable inlet device (2, 2', 2") has at least two sealing inserts (22, 22') which are identical to one another in their outer contour, and wherein the frame part (23, 23', 23") has at least two sealing recesses (236) which are identical to one another.

4. The cable entry arrangement (2, 2', 2") according to any one of the preceding claims, wherein The number and / or diameter of the cable passage openings (220) of at least two of the sealing inserts (22, 22') differ.

5. The cable entry arrangement (2, 2', 2") according to any of the preceding claims, wherein, At least one of the sealing inserts (22, 22') has at least on one side at its at least one cable passage opening (220) a surrounding retaining collar (221) and an annular securing element for increasing the retaining force when securing a cable passed through.

6. The cable entry arrangement (2, 2', 2") according to claim 5, wherein The outer diameter of the surrounding retaining collar (221) increases towards its free area in order to hold the annular securing element without loss on the retaining collar (221).

7. Cable entry device (2, 2', 2") according to claim 6, wherein the annular securing element is a screwable clamp or a cable tie.

8. Cable entry device (2, 2', 2") according to any of the preceding claims, wherein the material of the at least one sealing insert (22, 22') has a Shore hardness of 30 to 40.

9. The cable entry arrangement (2, 2', 2") according to any one of the preceding claims, wherein The at least one sealing insert (22, 22') has at least one sealing rib (202) within its at least one cylindrical cable passage opening (220) in order to ensure a maximum possible retaining force on a cable passed through, despite the elasticity of the sealing insert (22, 22').

10. The cable entry arrangement (2, 2', 2") according to any one of the preceding claims, wherein The frame part (23, 23', 23") has a plurality of threaded through-holes (230) as securing means.

11. The cable entry device according to any one of claims 1 to 9, wherein, The frame part (23, 23', 23") has at least one latching window and at least one separate quick securing means or at least one quick securing means firmly connected to the frame part (23, 23', 23") as securing means.

12. Switchgear construction with at least one cable lead-through device (2, 2', 2") according to one of the preceding claims and a switchgear (1) with a switchgear opening (10) and a switchgear closure element (11) by means of which the switchgear opening (10) can be closed, wherein The at least one cable entry device (2, 2', 2") is mounted in or on the switchgear cabinet (1) in the area of the wall perforations of the mounting wall (13) of the switchgear cabinet (1) and sealingly presses with its mounting seal (238) against the mounting wall (13), wherein the mounting seal (238) at least three- sided surrounds the respective wall perforation, wherein the front face (233) of the frame part (23, 23', 23") together with the locking face (223) of its sealing insert (22, 22') adjoins the switchgear opening (10) flush with the free edge of the mounting wall (13) and thus, by means of the switchgear locking element (11) in the closed state, presses against a linearly extending counter seal (113) fixed thereon and thus sealingly.

13. The switchgear structure according to claim 12, wherein, The switchgear locking element is a switchgear door that can be closed mounted on the switchgear opening (10) and / or a panel that can be screwed on the switchgear (1) at the switchgear opening (10) and / or a switchgear wall that can be latched on the switchgear opening (10) of the switchgear (1) or a switchgear cover that can be latched on the switchgear opening (10).

14. A method for operating a switchgear arrangement according to claim 12, comprising the following steps: - A. The at least one cable introduction device (2, 2', 2") is fixed with its frame part (23, 23', 23") on the associated wall perforation at the mounting wall (13) of the switchgear cabinet (1) from the inside or from the outside and directly on the switchgear cabinet opening (10) of the switchgear cabinet (1), such that the front face (233) of the at least one frame part (23, 23', 23") is flush with the free edge of the mounting wall (13) and thus also with the switchgear cabinet opening (10) of the switchgear cabinet (1); B. The at least one cable is inserted into the at least one sealing insert (22, 22'); C. The at least one sealing insert (22, 22') is inserted form- and force-locked into the corresponding sealing recess (236) of the frame part (23, 23', 23"), such that the closure face (223) of the at least one sealing insert (22, 22') terminates flat against the front face (233) of the at least one frame part (23, 23', 23"); D. The switchgear cabinet closure element (11) is used to close the switchgear cabinet opening (10) of the switchgear cabinet (1), wherein the linearly extending counter-sealing (113) fixed thereon is simultaneously sealingly pressed against the closure face (223) of the at least one sealing insert (22, 22') and against the front face (233) of the at least one frame part (23, 23', 23") by the switchgear cabinet closure element (11).

Images