DK2696443T3

DK2696443T3 - Multifunctional slip ring

Info

Publication number: DK2696443T3
Application number: DK13175948.2T
Authority: DK
Inventors: Michael Hallermeier; Johann Jilg; Christian Endrass; Wolfgang Graef
Original assignee: Schleifring Und Appbau Gmbh
Priority date: 2012-08-06
Filing date: 2013-07-10
Publication date: 2016-02-01
Also published as: CN103579881A; EP2696443A3; EP2696443B1; ES2558464T3; EP2696443A2; EP2696442A1; CN103579881B

Description

Technical Field

The invention relates to a slipring arrangement with a housing. Electrical signals can be transferred with a slipring arrangement, by means of slipring contacts or also contactless between parts rotating relatively to each other.

Prior art EP 0 662 736 discloses a slipring arrangement, in which a brush having a plurality of wires made of an electrically conductive material runs in a V-groove of a sliding track made of an electrically conductive material. Electrical current can be transmitted by the galvanic contact between the sliding track and the wires. The housing is constructed cylindrically and has to be disassembled to gain access to the slipring components. During reassembly, the arrangement must be adjusted to an exact alignment of the brushes with respect to the sliding tracks. Therefore, this slipring arrangement can only be serviced by a workshop that has the appropriate adjustment devices available. Even simple maintenance works, such as a re-oiling the sliding tracks also require mandatorily such a workshop. DE 14 89 080 A discloses a slipring arrangement, in which brushes in the form of massive individual wires run in grooves of a sliding track. Also here, a cylindrical housing is disclosed, which has to be disassembled to get access to the slipring components. EP 1154 920 discloses a motor pump unit, in which a separate regulating and/or control circuit is provided in a separate housing. DE 1 928 597 discloses an electrical machine with an easy to remove brush holder arrangement, which is accessible through a separate service door. The connecting terminals are positioned below another service door. The cooling air stream is guided via the connecting terminals to the brush holder arrangement.

Summary of the Invention

The invention addresses the problem of configuring a slipring housing and a slipring such that an easy access to the slipring components is possible, which also allows maintenance without readjusting the slipring arrangement.

This problem is solved by a device according to claim 1. Advantageous embodiments of the invention are specified in the dependent claims. A slipring arrangement with a slipring housing has at least four sides, preferably exactly four sides, which are preferably arranged perpendicularly to the respective adjacent sides. It encloses at least one slipring module with a rotation axis which slipring module is rotatable around said rotation axis, and at least one brush block. The sides are preferably arranged parallel to the rotation axis. Thereby, a simple, space-saving and modular design can be achieved. The individual sides fulfill individual functions and are preferably designed for access by certain groups of people. The separation of function results in a simple and maintenance-friendly arrangement that helps avoiding mistakes during installation and maintenance. Thus, certain covers that close access to individual sides can be closed by different means. Thereby, access is provided only to those groups of persons that possess corresponding the means for opening. Different means for closing may be, for example, different types of screws having different screw heads, preferably securing screw heads. An easy access to the connection compartment, for example, can be allowed by quick-release fasteners. For securing the access, a closure by at least one lock and/or a seal and/or a lead seal would be possible.

The first side preferably is a mounting wall by means of which the slipring housing can be mounted. Thus, the entire slipring housing can be mounted for example to the rotating or the stationary part of a device or a machine. For receiving the torque, an additional torque bridge can be provided. The torque bridge only transmits the torque and is otherwise freely movable in order to avoid over-determination. Since the bearings precisely define the rotation axis in the bearing housing, exclusively a torque may be introduced by the torque bridge. Additional and in particular lateral forces are not desirable.

The torque bridge is for example a rod which is received in a thread of the module or the bearing housing, and is supported or received by a mechanical stop on customer side. It is particularly preferred, if the mounting wall has a receptacle for a clamping device in which the slipring housing can be held during at least a manufacturing step. Thus, a very high accuracy can be achieved for example by milling of the slipring housing in a clamping.

The second side has an opening to a brush holder compartment through which the brush holders are accessible. This brush holder compartment is preferably accessible only to qualified service personnel. Thus, for example a brush holder with a defective brush may be replaced from this brush holder compartment. From there, also the contacts of the individual brushes can be accessed and checked. Likewise, various signals and/or resistances can be measured here, for the purpose of troubleshooting. Preferably, the individual brush holders are connected via connectors with cables to external connectors, wherein the cables are guided outside the brush holder compartment. Particularly preferred, the connectors are arranged such that they allow a direct connection from outside the brush holder compartment. Thus, the individual brush holders may be exchanged without further wiring works. Because there are no cables in the brush holder compartment, the brush holders can be accessed in the simplest way, without having to remove a plurality of cables before. Preferably, the brush holder compartment is sealable against the slipring module, and particularly preferred is sealed against it. Thus, as described below, the ingress of dust and/or particles in the compartment of the module as well as the ingress of electrically conductive abrasion, in particular of carbon brushes, into the brush holder compartment can be avoided. Thus, the electrical cable routing for electrically contacting and in particular for parallel connection of several brushes is arranged in the brush holder compartment and not in the compartment of the slipring module. If the brush holder compartment is free from electrically conductive contamination, lower isolation distances can be used here.

The third side has an opening to a connection compartment, through which the electrical connections are available. In this connection compartment, also the cables for connecting the brush holders with external connectors are preferably routed. Maintenance works and configuration changes and/or exchange of cables or external connectors, respectively, can be performed in a simple manner, without entering into contact with the slipring module and/or the brush holders. Thus, works in this area could also be carried out by persons who are not qualified for working on the slipring. Often the problem arises that when closing a cover of a slipring housing, a plurality of cables must be arranged in a very narrow space. When doing so in the slipring housings according to the prior art, it may occur that the cables come too close to movable slipring components and possibly touch movable components, which may lead to damaging the insulation and possibly may cause an error, as for example caused by interruption and/or short-circuit. In addition, the cables may stress the slipring components mechanically, for example may press on a brush holder and deform it. Thereby, a brush could may be pushed laterally off from the track and/or its contact pressure may be changed. This can lead to increased wear or premature failure. By the inventive design having a separate connection compartment, any contact of the cables with the slipring module and/or brush holders is avoided. Thereby, even in the case of strong compression of the cables, affecting these slipring components may be avoided safely, resulting in a higher reliability and quality of the arrangement. In the connection compartment, an enlarged space (compared to the prior art) is provided for cables. Thus, cables may be routed better and more reproducible in the connection compartment. Thereby, defined distances can be complied in order to achieve for example a certain crosstalk attentuation (Ober-sprechdåmpfung), which is also reproducible in series. Likewise, longer cable lengths can be accommodated. For reasons of rationalization, multiple same connection cables with equal lengths can now be used, as excessive cable lengths can now be accommodated in the connection compartment. The connection compartment can preferably be sealed in a dustproof manner against the slipring module, or is preferably sealed, respectively. Thereby, also a sealing against the brush holder compartment can be performed, if said brush holder compartment itself is not sealed against the module. In the case of gold wire brushes, it is important to prevent ingress of dust onto the sliding tracks. For example abrasive dust, as it often occurs in industrial plants, would lead to high wear and premature failure of the thin gold coatings on the sliding tracks and the brushes. In the case of a slipring with carbon brushes, extremely fine brush abrasion of the conductive carbon material occurs, which crawls through the smallest gaps and is deposited everywhere. This leads to impairment of the insulation and to creep-age currents or flashovers. The slipring-specific components, such as modules and brush blocks, are therefore regularly equipped with particularly large creep-age distances or isolation distances. However, in the connection compartment, standardized connectors or connnecting terminals have to be used. These are designed for standard environments, but do not provide the increased creepage distances which are necessary when used in the vicinity of sliprings. By sealing the connection compartment, those standardized connectors or connecting terminals can now be used as well, without any problems. Optionally, a cooling air stream may be passed over the slipring arrangement, without cooling air contaminated by slipring wear particles entering the connection compartment.

The fourth side has an opening to a module compartment, in which at least one slipring module is arranged. Through this opening, the slipring modules are accessible from one side, which is facing away from the brush holder side and which is preferably arranged opposite to the brush holder's side or the brush holder compartment's side. With such an opposite arrangement, there is no access to the brushes. Therefore, these can not be damaged during maintenance work on the slipring modules. By rotation of the slipring modules relative to the slipring housing, these can however be completely checked and serviced. For example, lubrication and/or cleaning and/or machining of the sliding track surfaces of the slipring modules may be performed. A slipring arrangement comprises at least slipring module and at least one corresponding brush holder. These are housed in a slipring housing as described above.

Description of the drawings

In the following, the invention is described exemplarily, without limiting the general inventive concept, by exemplary embodiments with reference to the drawings.

Figu re 1 shows an inventive device.

Figure 2 shows a side view of the mounting wall.

Figure 3 shows a side view of the brush holder compartment.

Figure 4 shows a side view of the connection compartment.

Figure 5 shows a side view of the module compartment.

Figure 6 shows a further side view of the brush holder compartment.

Figure 7 shows an overall view.

In Figure 1, a device according to the invention is shown in a top view. In the slipring housing 30, at least one slipring module 10 and at least one brush holder 20 is arranged. Preferably, the slipring module 10 is mounted by means of a module support 11 on a shaft 12, and is rotatabe relative to the slipring housing 30. The slipring module 10 rotates around the shaft, the center of which is the rotation axis of the arrangement. At least one first brush 21 and a second brush 22 are in engagment with at least one slipring module 10, which brushes are preferably held by at least one brush holder 20 and more preferably are contacted by means of this brush holder. In this Figure, the two brushes 21, 22 run on the same track of the slipring module and are electrically connected with each other. The at least one brush holder 20 is connected by at least one connector 23 via at least one cable 24 with at least one external connector 62. The slipring housing preferably has four sides, which are more preferably arranged perpendicularly to their adjacent sides. A first side preferably comprises a mounting wall 40, which particularly preferred comprises at least one mounting element 41 for mounting the slipring housing 30. A second side preferably comprises an opening to a brush holder compartment 50, which is preferably closable by a brush holder cover 51. A third side preferably comprises an opening to a connection compartment 60, which is preferably closable by a connection cover 61. This connection cover 61 preferably serves as a support for external connectors, such as a first external connector 62 and a second external connector 63. To allow a passage of the at least one cable 24 from the brush holder compartment 50 into the connection compartment 60, preferably at least one cable bushing 64 is provided. This may be a simple opening, which is preferably sealed with a sealant. Particularly preferred, a permanently elastic sealant, such as silicone is used. A fourth side preferably comprises an opening at a module compartment 70, in which the slipring module 10 is arranged. This opening is preferably closable a module cover 71. The slipring housing is preferably made of a metal such as zinc or aluminum, and particularly preferred is produced by injection molding technology. Alternatively, the housing may also comprise plastics material, particularly preferred comprise a fiber-reinforced, for example glass-fiber-reinforced and/or carbon-fiber-reinforced plastics material. Preferably, a sealing 31 is provided for sealing of the covers 51, 61 and 71. This may be a circumferential sealing, for example a sealing cord or an applied and/or molded plastics and/or rubber sealing.

In Figure 2, a side view of the mounting wall 40 is shown. This mounting wall 40 preferably comprises at least one mounting element 41. Mounting holes are provided for mounting, such as a first mounting hole 42 and a second mounting hole 43. Particularly preferred, these have an internal thread.

In Figure 3, a side view of the brush holder compartment 50 is shown. Individual brush holders 20, 25, 26 are preferably mounted by mounting screws 89. The distance between the individual brush holders preferably corresponds to the distance of the individual slipring modules. It is preferred, that the brush holder comprises conducting lines 81 for connecting brush contacts 80 with at least one connector 23. Further, recesses 82 may be provided in the brush holder through which access to the brushes is possible. This allows to control and/or adjust the state and/or abrasion and/or the mounting of the brush. Preferably, one connector for each brush holder is provided. But there may also be a plurality of connectors. It is particularly favorable, if the connectors are located immediately adjacent to the connection compartment, such that no connection cables run inside the brush holder compartment.

In Figure 4, a side view of the connection compartment 60 is shown. Here, a first cable bushing 64, a second cable bushing 65, and a third cable bushing 66 can be seen, which lead to the corresponding brush holders 20, 25 and 26. A cable 24 is exemplarily illustrated here, which leads to the connector 23 of the brush holder 20. Preferably, an individual cable bushing is provided for each brush holder. However, any number of cable bushings may be provided. Preferably, the cable bushing are adapted to the required cable cross-sections and/or sizes of the connectors. Particularly preferred, the cable bushing are sealed in order to achieve a separation of the connection compartment 60 from the brush holder compartment 50. Other than in the embodiment shown here, the connection compartment 60 may also have connecting terminals for connecting. In this case, at least a part of the external connectors 62, 63 could be omitted.

In Figure 5, a side view of the module compartment 70 is shown. Here, three slipring modules, a first slipring module 10, a second slipring module 15, and a third slipring module 16 are illustrated exemplarily. The slipring modules have at least one sliding track. Exemplary, the slipring module 10 comprises three sliding tracks, a first sliding track 17, a second sliding track 18, and a third sliding track 19. It is particularly preferred, if individual modules having three sliding tracks or a sliding track number corresponding to an integer multiple of 3 are used.

In Figure 6, a further side view of the brush holder compartment 50 is shown, in which the connection compartment 60 is cross-sectioned, as well. Here, the routing of the cable 24 as well as the arrangement of cable bushings can be seen.

In Figure 7, an overall view of the arrangement is shown. It shows a closed brush holder cover 51, which is preferably tightly closed by mounting screws 52. Below this brush holder cover 51, a bearing housing 90 is illustrated, in which preferably a bearing is accommodated, which bearing allows a rotation of the modules relative to the slipring housing. Below the bearing housing 90, a module connector housing 91 is located (which is non-rotatably connected with the modules), in which module connector housing 91 the slipring modules can be contacted. Either terminals and/or connectors are accomodated in this housing. The module connector compartment is preferably round. In an alternative embodiment, it is rectangular, preferably squared, wherein a symmetrical arrangement with respect to the rotation axis is particularly preferred. Connectors for connecting the module connector housing can be located either radially or also on the axial side of the housing. A terminal box with cable strain relief may be mounted inside or on top of the module connector housing, as well. The module connector housing itself is an important part of the arrangement, because it closes the slipring housing and the slipring arrangement, respectively, on the side of the module. Without this module connector housing, the slipring housing would be open at one side, such that the functionality of the slipring housing would not be given.

In this illustration, the upper part comprising the brush holder cover 51 and the connector cover 61 is rotatably connected via the bearing housing 90 to the module connector housing 91. The at least one slipring module 10 is rotatable together with the module connector housing inside the arrangement. Relative to these, the at least one brush holder 20 is rotatable together with the brush holder cover 51 and the connection cover 61.

List of refrence numerals 10 slipring module 11 module support 12 shaft 15 second slipring module 16 third slipring module 17 first sliding track 18 second sliding track 19 third sliding track 20 brush holder 21 first brush 22 second brush 23 connector 24 cable 25 second brush holder 26 third brush holder 30 slipring housing 31 sealing 40 mounting wall 41 mounting element 42 first mounting hole 43 second mounting hole 50 brush holder compartment 51 brush holder cover 52 mounting screws 60 connection compartment 61 Connection cover 62 first external connector 63 second external connector 64 cable bushing 65 second cable bushing 66 third cable bushing 70 module compartment 71 module cover 80 brush contacts 81 conducting lines 82 recess 89 mounting screws 90 bearing housing 91 module connector housing

Claims

A grinding ring arrangement comprising: at least one grinding module (10) with a rotary axis, a module connecting housing (91), and at least one brush holder (20) which is rotatable therewith, with at least one brush (21, 22) ), and a towing ring (30) having at least four sides (40, 50, 60, 70), with a first side comprising a mounting wall (40) with which the towing housing can be mounted, a second side comprising an opening to a brush holder compartment (50) through which the brush holders are available, a third side comprising an opening to a connection space (60) through which the electrical connections are available, and - a fourth side comprising an opening to a modular compartment ( 70) in which a towing module may be positioned where at least four sides are oriented parallel to the axis of rotation and disposed in a radial direction side by side.

Drag ring arrangement according to claim 1, characterized in that the drag ring housing (30) comprises exactly four sides (40, 50, 60, 70).

Drag ring arrangement according to claim 2, characterized in that the drag ring housing (30) comprises exactly four sides (40, 50, 60, 70), each side being positioned at a right angle to the adjacent sides.

A towing arrangement according to any one of the preceding claims, characterized in that at least one of the openings for a brush holder compartment (50), for a connecting compartment (60) and / or for a modular compartment (70) can be closed with a cover (61, 71, 81).

A towing arrangement according to any one of the preceding claims, characterized in that at least one means for mounting at least one brush holder (20) is provided.

A grinding ring arrangement according to any one of the preceding claims, characterized in that the brush holder space (50) is sealed relative to the grinding module (10).

A towing arrangement according to any one of the preceding claims, characterized in that the connecting space (60) is sealed relative to the towing module (10).

A slip ring arrangement according to any one of the preceding claims, characterized in that the brush holder compartment (50) is sealed relative to the connecting compartment (60).

9th

Drag ring arrangement according to any one of the preceding claims, characterized in that at least one drag ring module (10) comprises three drag paths (17, 18, 19) as well as at least one brush holder (20) with three brushes.