Electrical connector

Abstract

The invention relates to an electrical plug connector, in particular a built-in plug connector, comprising: a housing (1) with a connecting flange (3) which has recesses (4) for feeding through fastening means (5); a flange plate (10) with mounting holes (12) for connection to a device wall (G), a switch panel or the like; and a seal (17) inserted therebetween. The outer edge (14) of the flange plate (10) is bent towards the housing (1) and covers the outer edge of the connecting flange (3). The seal (17) protrudes with a peripheral sealing lip (18) into the insertion opening (2) and has an edge (19) which is bent towards the housing (1), fits over the outer peripheral edge of the connecting flange (3) and is itself covered by the outer edge (14) of the flange plate (10). In the assembled state, the peripheral edge (14) of the flange plate (10) protrudes up to no more than the height of the rear side of the connecting flange (3), and the edge (19) of the seal (17) protrudes beyond the rear face of the connecting flange (3).

Description

[0001] The invention relates to an electrical connector, in particular a panel-mount connector, according to the preamble of claim 1.

[0002] Panel-mount connectors, also known as chassis sockets, are installed in the housings of electrical devices, in control panels, or similar arrangements to connect these devices to electrical cables. These cables have a cable connector at at least one end that is compatible with the panel-mount connector and can be electrically connected to it and mechanically locked to prevent accidental disconnection.

[0003] The panel-mount connector typically comprises a housing with an insertion opening for the complementary connector, wherein a projecting connecting flange extends from the insertion-side end of the housing, featuring recesses for the insertion of fasteners. Furthermore, an insertion-side flange plate is provided, also with an insertion opening for the complementary connector and with mounting holes for connection to a device wall, control panel, or the like.

[0004] CN 204516967 U discloses a panel-mount connector in which a substantially flat sealing plate is inserted between the flange plate and the connecting flange on the housing, sealing the connection between these two components. If a seal of the entire panel-mount connector against a device wall into which it is inserted, a control panel, or the like is required, an additional seal must be provided between the panel-mount connector and the device wall. This makes installation more complex and slower and necessitates an additional component.

[0005] A seal for sealing at least the flange plate of a panel-mount connector is known and is used, for example, in the SE8FD-TOP mounting kit. This seal is designed as a substantially flat sealing plate and has a central cutout at the insertion point of the panel-mount connector. By positioning it between the device wall, control panel, or similar, and the flange plate with the insertion point for the complementary connector, the ingress of dust, moisture, etc., into the interior of the device or control panel is prevented.

[0006] Finally, at least one fastening element, typically a screw, serves to fix the housing, flange plate and gasket to the device wall, control panel or the like.

[0007] An electrical connector in which the outer edge of the flange plate is bent upwards towards the housing and covers the outer edge of the connecting flange is disclosed in US 2007 / 0141886 Al.

[0008] Further prior art connector arrangements are disclosed in documents US 9 666 975 B1, US 10 348 030 B1, WO 2018 / 220033 Al and JP 2005 327561 A.

[0009] The object of the present invention was to overcome the disadvantages of the prior art and to create a fully sealed built-in connector that can be easily and quickly installed by the end user without additional components using standard tools.

[0010] This problem is solved by a device according to claim 1. Further features are contained in the dependent claims.

[0011] The device according to the invention is characterized in that the outer edge of the flange plate is bent upwards towards the housing and covers the outer edge of the connecting flange, wherein the seal has a circumferential sealing lip that projects radially into the insertion opening and the seal has an edge bent upwards towards the housing that overlaps the outer circumferential edge of the connecting flange and which is itself covered by the outer edge of the flange plate, wherein in the assembled state the circumferential edge of the flange plate projects to a maximum height of the rear surface of the housing flange plate and the edge of the seal projecting towards the housing projects beyond the rear surface of the connecting flange over its entire circumference. By pressing the plug-in connector against the housing wall, the control panel or the like.Until the edge of the flange plate rests against the wall, the edge of the gasket, which extends beyond the rear of the connecting flange, is pressed firmly against the wall and compressed to fill the space between the connecting flange and the edge of the flange plate. The gasket is protected from damage both before, during, and after installation between the connecting flange and the flange plate. When the complementary connector is inserted, the insertion opening is sealed by the circumferential sealing lip, while the seal against the device housing or control panel is ensured by the raised edge of the gasket, which is protected by the flange plate. The components—flange plate, gasket, and housing with connecting flange—can be pre-assembled at the factory and can be used by the end user as a single, easily handled component.

[0012] Preferably, the inner side of the outer edge of the flange plate, which is bent upwards towards the housing, is chamfered outwards, and the outer side of the circumferential edge of the seal is also chamfered outwards, preferably in a complementary fashion. When the components are assembled or attached to the device wall or control panel using the provided fasteners, this slightly compresses the edge of the seal and presses it against the device wall or the surface of the control panel, resulting in a particularly good seal.

[0013] An alternative embodiment of a connector according to the invention provides that, in the assembled state, the circumferential edge of the flange plate terminates before the height of the rear flange plate of the housing, and a circumferential, outwardly projecting sealing edge covers at least part of the thickness of the edge of the flange plate bent upwards towards the housing. This avoids the shearing effect of a chamfered inner surface of the flange plate, and the sealing effect is achieved by a force acting perpendicularly on the edge of the seal.

[0014] According to the invention, sealing grommets are integrally formed at the locations of the mounting holes on the gasket, projecting upwards towards the flange plate. In the assembled state, the sealing grommets extend within the mounting holes of the flange plate, which preferably have bushing-shaped extensions towards the connecting flange of the housing. The outer diameter of these extensions preferably corresponds to the inner diameter of the mounting holes or the bushing-shaped extensions, with the sealing grommets terminating above the lower edge of the receiving area for the head of the fasteners in the mounting hole. This further improves the sealing effect by preventing the ingress of moisture, dirt, or dust through the mounting holes, while still providing the fasteners, particularly the screw heads, with a clearly perceptible, firm stop against the flange plate.

[0015] Further optimization of the sealing effect is achieved when the inner diameter of the sealing grommets corresponds minimally to the outer diameter of the fasteners, ensuring that all surfaces are in a sealing contact with each other.

[0016] According to a preferred embodiment of the invention, the connector is further characterized in that the flange plate has retaining pins projecting towards the housing, and the connecting flange has corresponding retaining bores into which the ends of the retaining pins can be inserted. Preferably, the retaining bores are bounded by rings that rise above the connecting flange, and the seal covers these rings with centrally open domes adjoining them. This ensures that the flange plate and the housing, with the seal inserted between them, are sufficiently well connected to prevent separation and allow the connector to be handled as a single component. Furthermore, in the case of retaining bores that completely penetrate the connecting flange, the retaining pins can be positioned to abut the front of the device housing, control panel, or the like.are designed to act as a spacer to limit the impact on the seal and thus prevent damage to it.

[0017] To ensure a tight seal for the retaining holes as well, the central opening of the domes preferably has a slightly smaller diameter than the through-hole and / or the outer diameter of the retaining pins. This ensures a tight seal for the retaining pins, as well as good adhesion due to friction between the seal and the retaining pins.

[0018] Preferably, the connector is designed such that the flange plate has a circumferential groove surrounding the insertion opening, in which groove a rib is received that radially surrounds the sealing lip for the insertion opening and rises above the surface of the seal. Besides optimally centering the seal and flange plate relative to each other, this rib also acts as an additional sealing strip, thus increasing the sealing effect.

[0019] In many cases involving plug connections, it is desirable to prevent unintentional disconnection. For this purpose, locking mechanisms are provided between the complementary connectors, but these must be unlocked by actuating an actuator to intentionally disconnect the plug. Therefore, a preferred embodiment of a connector according to the invention provides that a recess extends radially outwards from the insertion opening in the flange plate. In the assembled state, an actuator for a locking mechanism projects through this recess from the housing outwards onto the front of the flange plate. To optimally seal this extension of the insertion opening, a dome, rising radially from the insertion opening above the surface of the seal, extends outwards through the recess onto the front of the flange plate.The actuating element is covered by the dome.

[0020] As a purely exemplary example, a seal for an electrical connector, in particular a panel-mount connector, specifically a connector as described in one of the preceding paragraphs, has been designed to optimally seal it against a device housing, control panel, or similar surface. This seal has a central cutout at the insertion point of the connector and recesses at the locations of mounting holes for the connector.

[0021] It is characterized, purely by way of example, by the fact that a sealing lip circumferentially surrounds the central cutout and limits its inner circumference, and that a folded-back edge, rising above the rear surface of the seal, is present on one rear side, on which a circumferential sealing structure is arranged. This seal is thus suitable for sealing both the insertion opening when a complementary connector is inserted and simultaneously sealing the panel-mount connector against the device housing, the wall of the control panel, or the like.

[0022] Preferably, the sealing structure comprises a circumferential sealing strip, which enables a reliable linear seal. Preferably, the outer edge of the circumferential seal is chamfered outwards in order to convert only a portion of the fastening force acting perpendicularly on the seal into contact pressure and thus limit it.

[0023] As a purely exemplary alternative, a seal is provided in which the sealing structure is a radially outwardly projecting, circumferential sealing edge. This prevents an undesirable shearing effect on the outer edge of the seal and allows the sealing edge to be pressed vertically against the device wall, control panel, or similar.

[0024] A particularly preferred exemplary embodiment for a seal, especially for panel-mount connectors, is characterized in that sealing grommets with central openings for the fasteners are arranged at positions for the passage of fasteners, extending above the front surface of the seal. This allows the panel-mount connector to be optimally sealed even at the points of the fasteners.

[0025] Another advantageous embodiment of an exemplary seal is characterized in that domes with central openings for the spacer pins are arranged at positions for the insertion of retaining pins above the front surface of the seal. Such a seal is ideally suited for use with plug-in connectors whose flange plate and housing can be at least temporarily connected to each other by means of cooperating retaining pins and retaining holes on these components.

[0026] For plug-in connectors with locking mechanisms and actuating elements for unlocking them, a seal is ideally suited which, by way of example, has a dome extending radially beyond the insertion opening and rising above the front surface of the seal. The actuating element of the locking mechanism can be accommodated beneath this dome. Preferably, this dome is formed integrally with the seal.

[0027] The precise centering of the gasket relative to, preferably, the flange plate, is ensured by a ridge that radially surrounds the sealing lip for the insertion opening and rises above the front surface of the gasket. This ridge also provides an additional sealing edge and further improves the sealing effect.

[0028] To ensure the plug-in connector remains sealed even when the complementary connector is not plugged in, preferably at least one radially projecting connecting strip is molded onto the seal. A sealing plug is attached to the outer end of this strip, the outer diameter of which is slightly larger than the inner diameter of the sealing lip of the insertion opening. To save material, this sealing plug is preferably cup-shaped.

[0029] Preferably, a full-surface grip tab projects from the side of the sealing plug opposite the connecting strip, which significantly simplifies handling. Preferably, this grip tab is also cup-shaped and, when the sealing plug is inserted, covers and protects the dome that covers and seals the actuating element of the locking mechanism.

[0030] To better understand the invention, it is explained in more detail with reference to the following figures.

[0031] They each show, in a highly simplified, schematic representation: Fig. 1 a view of a first embodiment of a built-in connector according to the invention from an oblique angle from above; Fig. 2 a view rotated by 180 degrees; Fig. 3 an exploded view from an oblique front view from above; Fig. 4 a cross-section exactly in the center plane of the built-in connector Figs. 1 to 3Fig. 5 a cross-section in a parallel plane, which includes the central axes of the mounting holes and the retaining pins; Fig. 6 a detailed cross-section in the area of ​​the mounting holes with the mounting screw inserted; Fig. 7 a detailed cross-section in the area of ​​the mounting holes with the mounting screw inserted and tightened; Fig. 8 an advantageous embodiment of a seal for a panel-mount connector on a larger scale; Fig. 9 a view of a further embodiment of a panel-mount connector according to the invention from a front oblique angle; Fig. 10 a cross-section exactly in the central plane of the panel-mount connector Fig. 7 ; and Fig. 11 a cross-section through another embodiment of a built-in connector, with a stepped, angled sealing edge.

[0032] It should be noted at the outset that in the differently described embodiments, identical parts are provided with the same reference numerals or component designations, and the disclosures contained in the entire description can be applied analogously to identical parts with the same reference numerals or component designations. Furthermore, the positional designations chosen in the description, such as top, bottom, side, etc., refer to the figure directly described and illustrated, and these positional designations must be applied analogously to the new position if the position changes.

[0033] In the Fig. 1Figure 1 shows an exemplary first embodiment of a panel-mount connector according to the invention in the form of a chassis socket for a data connector, in particular an RJ45 data connector, in a perspective view. Of course, the inventive design can also be applied to other types of panel-mount connectors, as demonstrated in the further embodiment shown in Figure 2. Fig. 9 and 10 An example is provided, showing an XLR chassis socket.

[0034] In the following description, the same reference symbols or component designations will be used for identical parts. To avoid unnecessary repetition, references to previously provided detailed descriptions will be made.

[0035] The exemplary embodiments show possible embodiment variants, whereby it should be noted at this point that the invention is not limited to the specifically illustrated embodiment variants, but rather various combinations of the individual embodiment variants are also possible and this possibility of variation lies within the skill of the person skilled in this technical field due to the teaching on technical action by the present invention.

[0036] The electrical panel-mount connector of the Fig. 1 , in an exploded view in Fig. 3As shown in detail, the housing 1 comprises a plug-in opening 2 for a complementary connector (not shown). At the plug-in end, on the front of the housing 1, a projecting connecting flange 3 is provided, which preferably extends at right angles from the housing 1 and preferably over its entire circumference. The connecting flange 3 also has through-holes or partially open recesses 4 through which fastening elements 5, typically fastening screws, rivets, or the like, can be passed for the panel-mount connector in order to fix it in a device wall G, a control panel, or similar elements (see [reference to be added]). Fig. 6 ). The recesses 4 are preferably positioned in two corners of the rectangular connecting flange 3 opposite each other with respect to the central axis of the insertion opening 2.

[0037] Of course, other outline shapes for the connecting flange 3 are also possible, for example a circular outline, a polygon, or the like. Through openings 4 can also be present in all corners of the connecting flange 3.

[0038] At other locations on the connecting flange 3, retaining bores 6 are found, which are bounded by rings 7 that rise above the front surface of the connecting flange 3. Typically, two retaining bores 6 are positioned in two corners of the connecting flange 3 opposite each other with respect to the central axis of the insertion opening 2. Complementary retaining elements of other components can be inserted into these retaining bores 6.

[0039] Preferably, these retaining bores 6 are provided in the center of rings 7 that rise above the connecting flange 3.

[0040] Finally, a locking arrangement 8, 9 is positioned in or on the housing 1, at least one of whose locking elements 9 can also be unlocked by means of an actuating element 8. This actuating element 8 projects forward beyond the insertion-side end of the housing 1 so that it can be easily reached by the user.

[0041] In the assembled state of the panel-mount connector, the front of the connecting flange 3 of the housing 1 is faced with a plug-in flange plate 10. This plate has a plug-in opening 11 for the complementary connector, arranged coaxially with the plug-in opening 2 of the housing 1. Furthermore, mounting holes 12 are machined into the flange plate 10, positioned coaxially with the recesses 4 in the connecting flange 3, and designed to accommodate the fastening elements 5 for the panel-mount connector for connection to a device wall, control panel, or the like. At the location where the actuating element 8 is positioned, a radially outwardly projecting recess 13 extends from the plug-in opening 11, through which the actuating element 8 can protrude onto the front of the flange plate 10.

[0042] The outer edge 14 of the flange plate 10 is bent upwards and covered towards the housing 1 - this is better shown in the rear view of the panel-mount connector in Fig. 2 and in the cross-section of Fig. 4 recognizable - the outer edge of the connecting flange 3. On the rear side of the flange plate 10, the mounting holes 12 preferably have bushing-shaped extensions 15 in the direction of the connecting flange 3 and preferably extend to contact with this connecting flange 3.

[0043] At positions corresponding to the mounting holes 6 of the connecting flange 3, the flange plate 10 has mounting pins 16 projecting towards the housing 1. The ends of these pins are designed for insertion and fixing into the mounting holes 6 of the connecting flange 3. Alternatively, they can be fully inserted into the mounting holes 6 until they make contact with the housing wall, control panel, or the like, and thus act as spacers.

[0044] A preferably plate-shaped seal 17 is inserted directly between the flange plate 10 and the connecting flange 3 of the housing 1 and held clamped between these components for sealing against the device wall G, the control panel, or the like. This seal 17 has a central recess 30, which corresponds in size at least to the insertion opening 2 and which is arranged coaxially to it. Preferably, the central cutout 30 is bounded by a circumferential sealing lip 18, which projects radially into the insertion opening 2 and, when the complementary connector is inserted, seals the annular gap of the insertion opening 2.

[0045] The edge 19 of the seal 17 is bent upwards in the area of ​​the flange plate 10 and the connecting flange 3 towards the housing 1 and overlaps the outer circumferential edge of the connecting flange 3 with this bent edge strip 19. On the other hand, the bent edge 19 of the seal 17 itself is again covered by the bent outer edge 14 of the flange plate 10. The relative thicknesses of the seal 17 and the connecting flange, as well as the height of the outer edge 14, are selected such that, in the assembled state, the circumferential edge 14 of the flange plate 10 projects to a maximum height of the rear of the connecting flange 3 of the housing 1, and the edge 19 of the seal 17 projecting towards the housing 1 extends over the entire circumference of the connecting flange 3 beyond its rear surface and, during the installation of the plug connector, is finally pressed against the wall of the device housing, the control panel, or the like, thus fulfilling the sealing function.At the location of the mounting holes 12 of the flange plate or the recesses 4 of the connecting flange 3, through openings 20 are also formed in the seal 17.

[0046] As in the Figs. 6 and 7 As can be clearly seen, in a preferred embodiment of the invention, the inner side of the bent edge 14 of the flange plate 10 is chamfered outwards. The gasket 17, or rather its bent edge 19, is also chamfered outwards, preferably in a manner complementary to the chamfer of the flange plate 10. As shown in Fig. 7 The illustration shows that when the fastening screw 5 is tightened during the installation of the plug-in connector, the edge 19 of the seal 17 is pressed against the device wall G, the control panel, or the like, whereby the seal is preferably completely covered and protected by the flange plate 10. Alternatively, a design corresponding to the Fig. 11a configuration is selected in which, in the assembled state, the circumferential edge 14 of the flange plate 10 ends before the height of the rear of the connecting flange 3 of the housing 1 and a circumferential, outwardly projecting sealing edge 31 covers at least part of the thickness of the edge 14 of the flange plate 10 bent upwards towards the housing 1.

[0047] As also in the Figs. 6 to 8As clearly shown, according to a preferred embodiment, the seal 17 has sealing grommets 21 molded onto it at the locations of the mounting bores 12, which project upwards towards the rear of the flange plate 10. In the assembled state, these sealing grommets 21 extend within the mounting bores 12 of the flange plate 10, and in particular also within its bushing-shaped extension 15, the outer diameter of which preferably corresponds to the inner diameter of the mounting bore 12 or the extension 15. The inner diameter is defined here in the section where the shank of the fastening element, preferably the threaded section of a fastening screw 5, is received in the mounting bore 12.

[0048] In an unloaded state, the sealing grommets 21 end - as in Fig. 6shown - slightly above the lower edge of the receiving area for the head of the fastening screw 5 in the mounting bore 12. After tightening the fastening screw 5, the material of the sealing sleeves 21 is squeezed between the fastening screw 5, which is tightened until it stops against the inside of the mounting bore 12 of the flange plate 10, and the flange plate 10, thereby sealing the area of ​​the screw head.

[0049] The inner diameter of the sealing grommets 21 should preferably be larger than the outer diameter of the fastening means, in particular the fastening screws 5, where this outer diameter is the nominal diameter of the thread. The inner diameter of the through-opening 20 of the sealing grommets 21 should be at least as shown in Fig 6The outer diameter of the fastening screws 5 is shown in the unloaded state. When the fastening screw 5 is fully tightened, however, the sealing sleeve 5 is compressed, and the material of the sealing sleeve 21 presses against the inner wall of the mounting bore 12 and penetrates between the threads of the fastening screw 5, thus changing the Fig. 7 The condition shown is achieved. Together with the positive locking in the area of ​​the screw head, this results in an optimal sealing effect over the entire height of the sealing sleeve 21.

[0050] At the positions of the retaining bores 6 on the connecting flange 3, the seal 17 preferably has domes 22 that rise above its surface and, in the assembled state of the plug connector, overlap the rings 7. For the passage of the retaining pins 16 of the flange plate 10, these domes 22 have central openings 23, the diameter of which is advantageously somewhat smaller than the diameter of the retaining bore 6 and / or the section of the retaining pin 16 to be inserted into the retaining bore 6.

[0051] A further structure extending above the surface of the seal 17 is a rib 24 or protrusion that radially surrounds the sealing lip 18 for the insertion opening 2 and the central recess 30. When the seal 17 and flange plate 10 are assembled, this rib 24 is received in a corresponding groove 25, which coaxially surrounds the insertion opening 11.

[0052] In the area where, in the assembled state, the actuating element 8 projects through the flange plate 10, the strip 24 transitions into a dome 26 that also rises above the surface of the seal 17 and in height even further above the height of the strip 24. This dome 26, which is advantageously formed integrally with the seal 17, also projects beyond the front of the flange plate 10 and allows the user to actuate the operating element 8 and thus release the locking mechanism of the complementary connector inserted into the panel-mount connector, which until then has been held in the insertion opening 2 of the housing 1 by the locking element 9.

[0053] In addition to sealing the insertion opening 2 when the complementary connector is inserted by the sealing lip 18 of the seal 17, there was also a desire for the possibility of sealing in the uninserted state. For this purpose, at least one radially projecting connecting strip is formed on the seal 17, protruding below the edge region 14 of the flange plate 10 which is bent towards the housing 1. Preferably, as shown in the figures, two such connecting strips 27 are formed on the seal 17 in an approximately parallel or slightly V-shaped arrangement. A sealing plug 28 is attached to the outer end of these connecting strips 27, the outer diameter of which corresponds at most to the inner diameter of the insertion openings 2, 11 and which is preferably slightly larger than the inner diameter of the sealing lip 18 of the seal 17 that seals the insertion opening 2. Preferably, the sealing plug 28 is open and cup-shaped.

[0054] For easier handling of the sealing plug 28, a full-surface grip tab 29 projects from the side of the sealing plug 28 opposite the connecting strip 27. Preferably, this grip tab 29 is also open and cup-shaped, with its opening oriented in the same direction as the dome 26 sealing the actuating element 8 and lying in line with this dome 26 and the central axis of the insertion opening 2. This ensures that when the connecting strips 27 are folded back to insert the sealing plug 28 into the insertion opening 2, the dome 26 is simultaneously covered and protected by the cup-shaped grip tab 29.

[0055] Fig. 11 Cross-section through another embodiment of a built-in connector, with a stepped, angled sealing edge.

[0056] By pressing the connector against the housing wall, control panel, or similar surface until the edge of the flange plate rests against it, the edge of the seal, which extends beyond the rear of the connecting flange, is firmly pressed against the wall and compressed to fill the space between the connecting flange and the edge of the flange plate. The seal is thus protected from damage before, during, and after installation between the connecting flange and the flange plate. When the complementary connector is inserted, the insertion opening is sealed by the circumferential sealing lip, while the seal against the device housing or control panel is ensured by the raised edge of the seal, which is protected by the flange plate. The components—flange plate, seal, and housing with connecting flange—can be pre-assembled at the factory and can be used by the end user as a single, easily handled component.

[0057] The scope of protection is defined by the claims. However, the description and drawings must be consulted for the interpretation of the claims. Individual features or combinations of features from the different embodiments shown and described can, in themselves, represent independent inventive solutions. The problem underlying these independent inventive solutions can be found in the description.

[0058] Finally, for the sake of clarity, it should be noted that, for a better understanding of the structure, some elements have been shown not to scale and / or enlarged and / or reduced in size. Reference numeral list 1 Housing 36 2 insertion opening 37 3 Connecting flange 38 4 Exclusion 39 5 fastening screw 40 6 Retaining hole 7 ring 41 8 Actuating element 42 9 locking element 43 10 Flange plate 44 45 11 insertion opening 12 Mounting hole 46 13 Exclusion 47 14 Upturned edge 48 15 Bushing-shaped extension 49 50 16 retaining pin 17 seal 51 18 Sealing lip 52 19 Upturned edge 53 20 Passage opening 54 55 21 sealing grommet 22 Cathedral 56 23 Central opening 57 24 bar 58 25 Nut 59 60 26 Cathedral 27 Connecting strip 61 28 sealing plug 62 29 handle 63 30 Central section 64 65 31 Sealing edge 32 G Equipment wall 33 34 35

Claims

1. Electrical plug connector, in particular chassis connector, comprising a housing (1) with an insertion opening (2) for a complementary plug connector, wherein a projecting connecting flange (3) projects from the insertion-side end of the housing (1), which has recesses (4) for the passage of fastening means (5), a plug-in-side flange plate (10) with a insertion opening (11) for the complementary plug-in connector and with mounting bores (12) for connection to an appliance wall (G), a control panel or the like, and a seal (17) inserted between the connecting flange (3) and the flange plate (10) and having a central cut-out (30) in the region of the insertion opening (2), wherein the seal (17) projects radially into the insertion opening (2) with a circumferential sealing lip (18), and at least one fastening means (5) for fixing the housing (1), flange plate (10) and seal (17) to the appliance wall (G), control panel or the like, wherein the outer edge (14) of the flange plate (10) is bent up in the direction of the housing (1) and covers the outer edge of the connecting flange (3), and the seal (17) has an edge (19) on the rear side which is bent up in the direction of the housing (1), which rises above the rear surface of the seal (17) and engages over the outer peripheral edge of the connecting flange (3) and which is itself covered by the outer edge (14) of the flange plate (10), wherein, in the assembled state, the circumferential edge (14) of the flange plate (10) projects to a maximum height of the rear side of the connecting flange (3) of the housing (1) and the edge (19) of the seal (17) projecting in the direction of the housing (1) projects over the entire circumference of the connecting flange (3) over the rear surface thereof and forms a sealing structure or is provided with a sealing structure, characterized in that sealing grommets (21) are integrally formed on the seal (17) at the locations of the mounting bores (12) and project upwards in the direction of the flange plate (10), wherein the sealing grommets (21) extend inside the mounting bores (12) of the flange plate (10) in the assembled state, wherein their outer diameter preferably corresponds to the inner diameter of the mounting bore (12), and wherein the sealing grommets (21) end above the lower edge of the receiving area for the head of the fastening means (5) in the mounting bore (12).

2. Plug connector according to claim 1, characterized in that the inner side of the outer edge (14) of the flange plate (10), which is bent up in the direction of the housing (1), is beveled outwards, and in that the outer side of the circumferential edge (19) of the seal (17) is also beveled outwards, preferably complementarily thereto.

3. Plug connector according to claim 1, characterized in that, in the assembled state, the circumferential edge (14) of the flange plate (10) ends before the height of the rear side of the connecting flange (3) of the housing (1) and a circumferential, outwardly projecting sealing edge (31) covers at least part of the thickness of the edge (14) of the flange plate (10) which is bent up in the direction of the housing (1).

4. Plug connector according to claim 1, characterized in that the mounting bores (12) of the flange plate (10) have bushing-shaped extensions (15) in the direction towards the connecting flange (3).

5. Plug connector according to one of claims 1 to 4, characterized in that the flange plate (10) has retaining pins (16) projecting in the direction of the housing (1), in that the connecting flange (3) has corresponding retaining holes (6), into which the ends of the retaining pins (16) can be inserted, wherein the retaining bores (6) extend in the center of rings (7) rising above the connecting flange (3) and the seal (17) covers these rings (7) with centrally open domes (22) resting thereon.

6. Plug connector according to claim 5, characterized in that the central opening (23) of the domes (22) has a slightly smaller diameter than the retaining bore (6) and / or the outer diameter of the retaining pins (16).

7. Plug connector according to one of claims 1 to 6, characterized in that the flange plate (10) has a circumferential groove (25) surrounding the insertion opening (11), in which groove (25) a strip (24) surrounding the sealing lip (18) for the insertion opening (2) radially on the outside and rising above the surface of the seal (17) is accommodated.

8. Plug connector according to one of claims 1 to 7, characterized in that a recess (13) extends radially outwards from the insertion opening (11) in the flange plate (10), through which recess, in the assembled state, an actuating element (8) for a locking mechanism (8, 9) projects outwardly from the housing (1) onto the front side of the flange plate (3) in the assembled state, wherein a dome (26) which rises radially adjacent to the insertion opening (11) above the surface of the seal (17) extends outwardly through the recess (13) onto the front side of the flange plate (10) and the actuating element (8) is covered by the dome (26).

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