DE10161740B4 - A slip ring transmission - Google Patents

Abstract

The device has at least one non-ferrous inner ring (14) embedded in insulating material (19) as a rotor component, a graphite outer ring (15) enclosing the inner ring to form a gap (18), concentrically centered relative to the inner ring by lateral insulating material and electrically coupled to the inner ring by contact lamella (22) bridging the gap and at least one graphite slip contact (34) pressed against the outer ring as a stator component.

Description

The The invention relates to a slip ring transmission for transmission of electric currents and / or Signals between a stator housing and a rotor shaft.

at slip ring larger diameter It is known to use the so-called coal / coal technology. This is for example for larger generators the case. In this case, in the circumferentially closed slip rings To specify electrical contacts, the slip rings must have large wall thicknesses have, so that also sufficiently large threads can be accommodated.

therefore is the use of coal / coal technology in Schleifringübertragern with small diameters and circumferentially closed slip rings not possible.

Around nevertheless, the coal / coal technology also in Schleifringübertragern To use smaller diameter, you have the slip rings divided into individual segments and each slip ring segment a corresponding support body, in particular of brass, fixed by gluing. In such Designs were then split between the circumferentially one another following slip ring segments unavoidable. The column led to electrical interference with the consequence that the transmission of signals, in particular measurement signals, associated with inaccuracies was.

From the DD 248 909 A1 As the closest prior art to the invention, a slip ring body is known which has a hub which is separated from the electrically active parts by insulation. On the insulation, an effective three-part current distribution ring is arranged. Of these, the inner ring is designed as a shrinkable solid ring, which carries with the aid of webs on the circumference provided with expansion gaps outer ring. The outer ring is in contact with a Kohlegleitring. It is the task of the power distribution ring, the current introduced via power supply rails, which are mounted in the webs in the slip ring body with the help of the ring-land system in the Kohlegleitring so that on the entire circumference of the slip ring body a minimal resistance from the power distribution ring to a Carbon brush is achieved.

The DE 25 10 578 A1 discloses a slip ring assembly having a sleeve mountable on the rotor shaft of an electric machine, a layer of insulating material forming at least the outer surface of the sleeve, at least two slip rings seated on the sleeve, and slip rings against each other. The slip rings are slid in a sliding fit on the insulating layer surrounding the bushing and releasably clamped in the axial direction of the socket. The socket has an electrically insulated flange near one end. The slip rings are interspersed in the circumferential direction in mutual distances of electrically insulated, in the direction of the flange resilient screws. An electrically insulated part is engageable with the slip rings by means of nuts screwed onto the free ends of the screws.

In the scope of DE 100 09 007 A1 a slip ring assembly for electric motors and generators is known in which brushes made of carbon materials and slip rings of the slip ring body are electrically connected to each other. The slip rings include metallic slip rings of conventional design as a slip ring base and an electrically conductive sliding layer of a graphite material. Its thickness is at most 11 of the radius of each slip ring. The sliding layer is electrically conductively attached to the periphery of the metallic slip ring base by gluing.

Of the Invention is - starting from the prior art - the Object of the invention to provide a slip ring, the even with a small diameter in the coal / coal technology economically can be produced and operated.

These The object is achieved with the features specified in claim 1.

After that is now a circumferentially closed inner ring made of a non-ferrous metal, in particular of brass, embedded in an insulating compound, the Part of a rotor shaft is. The insulating compound can, for example Be epoxy resin. The inner ring is associated with one of the rotor shaft associated electrical Connection electrically contacted and from here with a frontal Cable gland connected.

On the circumference of the inner ring extends a peripherally also closed outer ring made of graphite. This outer ring is laterally fixed by insulating materials, that it is perfectly concentric with the inner ring. In this case, a distance is selectively formed between the inner ring and the outer ring, which takes into account the different expansion coefficients of eg brass and graphite when exposed to heat. Here, the temperature range between the ambient temperature to the maximum permissible operating temperature to take account of.

Around constantly a perfect electrical coupling between the inner ring and the outer ring by bridging the Distance to produce, are circumferentially of the inner ring metallic Contact blades provided over the entire circumference of the inner ring or only arranged over partial areas could be. These contact blades are designed to be in themselves are springy and in this way the changes in the distance between Inner ring and outer ring due to heat effects can follow without further ado and constantly the produce electrical coupling between inner ring and outer ring.

The Contact blades can e.g. made of a copper-beryllium alloy and then thermally be treated.

The Invention is associated with the particular advantage that the outer ring made of graphite not only in the wall thickness, but also in diameter small can be held. In this way it is possible compact slip ring transmission with outside diameters of 200mm and smaller to provide, in addition to signals, in particular Measuring signals, even electrical currents up to about 50 amps transferred can.

Furthermore guaranteed the invention that now achieves speeds up to about 60 m / s are.

Further is achieved with the invention that the sliding contact only with a comparatively small force must be pressed against the outer ring, to ensure proper signal and / or power transmission. A low contact pressure leads to a significantly lower wear and ultimately to a longer service life a slip ring transmitter. Furthermore the abrasion is very low, so that within the Schleifringübertragers in principle no pollution can occur and consequently no cause an abrasion-related pollution caused electrical short circuits can.

Around the contact blades to give a secure grip on the inner ring are now according to claim 2 the contact blades in a groove in the outer surface of the Inner ring over distributed over the entire circumference or embedded only in sections. There the contact blades have a central domed section, this section is independent on the size of the distance between inner ring and outer ring constantly on the inner surface of the Outer ring.

The Fixing the contact blades in the groove is done in particular by Clamping over laterally of the crowning webs located.

One perfect corrosion protection of the contact lamellae becomes appropriate Claim 3 achieved by the fact that lying next to the groove areas the outer surface of the Inner rings are gold plated.

A particularly advantageous embodiment The invention is seen in the features of claim 4. Such an embodiment has usually a plurality of spaced apart inner rings and outer rings as well as the outer rings assigned sliding contacts. The inner rings are here in one Insulating poured in the form of an insulating bushing. The outer rings are distanced from each other by insulation in the form of insulating rings. To every outer ring are two sliding contacts pressed, which are attached to the ends of pivot arms. The swivel arms point in opposite directions. To an axially compact design To realize, are the each outer ring associated pivot arms to the respective adjacent outer ring arranged offset in the circumferential direction. A mutual disturbing influence is avoided in this way.

Everyone Inner ring is over embedded in the insulating bushing electrical connection lines led to a contact terminal at one end of the insulating bushing. From lead this contact connection then cables to a front-side cable gland on the rotor.

To the features of claim 5, the insulating bushing on the designed as a hollow shaft rotor shaft fixed by gluing. This is preferably done only at the ends of the insulating bushing. To is a length section the hollow shaft, which made of steel or of another material can exist, in about the middle length range of Isolierbuchse circumferentially provided with a smaller diameter. The outer rings and the insulating rings are from a front end of the insulating bushing successively pushed onto the inner rings or the insulating bushing. For this purpose, the insulating bush at one end has a peripheral side Collar on. At the other end is a disc against the last Isolierring braced, so then all outer rings and Insulating rings are securely fixed in position. The hollow shaft can be over end roller bearing in end walls of the stator housing be stored.

The each outer ring associated pivot arms are articulated according to claim 6 each to a holder. This holder is fixed on a parallel to the axis of rotation of the rotor shaft extending, fixed in the stator housing support rod by clamping. The support bar can be set for example in the end walls of the stator housing. The successive brackets are positionally determined by spacers surrounding the support bar.

The Invention is illustrated below with reference to an illustrated in the drawings embodiment explained in more detail. It demonstrate:

1 in the front view of a slip ring transformer;

2 a vertical longitudinal section through the representation of 1 along the line II-II seen in the direction of arrows IIa and

3 in an enlarged view the detail III of 2 ,

With 1 is in the 1 to 3 a slip ring transformer for transmitting electrical currents and / or signals referred to.

The slip ring transmitter 1 has a hollow rotor shaft 2 made of steel. The rotation axis is with 3 designated. End of the rotor shaft 2 are rolling bearings 4 . 5 provided in end walls 6 . 7 a stator housing 8th are used. Peripheral side of the end walls 6 . 7 is a cylindrical jacket 9 by screws 10 attached.

On the rotor shaft 2 is up to the stop on a collar 11 an insulating compound, in particular epoxy resin, in the form of an insulating bushing 12 pushed and fastened by gluing. The bonding takes place only at the ends of the insulating bushing 12 , This is in the approximately middle length of the insulating bushing 12 the rotor shaft 2 with a circumferential recess 13 Mistake.

At the circumference of the insulating bush 12 are a total of nine inner rings 14 cast in brass. As here in particular the 3 can recognize, have the inner rings 14 the same outer diameter as the insulating bush 12 on. On the circumference of each inner ring 14 is an outer ring 15 made of graphite. Between the outer surface 16 of the inner ring 14 and the inner surface 17 of the outer ring 15 is a distance 18 present, the different thermal expansion coefficients of the materials of the inner ring 14 and the outer ring 15 considered. The orientation of each outer ring 15 takes place via lateral insulating compounds, in particular epoxy resin, in the form of insulating rings 19 , The outer diameter of the insulating rings 19 is smaller than the outer diameter of the outer rings 15 ,

The inner rings 14 own in their outer surface 16 introduced grooves 20 , The areas 21 the outer surfaces 16 next to the grooves 20 are gold plated. In the grooves 20 are like that 3 can be seen closer, contact blades 22 used. These contact blades 22 have lateral bars 23 and a middle camber 24 , About the bridges 23 are the contact blades 22 in the grooves 20 fixed in position by clamping. The crowns 24 are permanently on the inner surfaces 17 the outer rings 15 , Because of this design is at any size of the distance 18 between the inner rings 14 and the outer rings 15 a contact of the inner rings 14 with the outer rings 15 over the contact blades 22 ensured.

The axial positional fixation of the outer rings 15 and the insulating rings 19 done by a frontal with screws 25 at the insulating bush 12 fixable disc 26 , which are the insulating rings 19 and outer rings 15 against a radial collar 27 the insulating bush 12 suppressed.

Every inner ring 14 is in a manner not shown with a contact terminal 28 in the radial collar 27 the insulating bush 12 connected. About this contact connection 28 then takes place an electrical connection to a front side of the rotor shaft 2 provided cable gland 29 ,

In the end walls 6 . 7 of the stator housing 8th are circumferentially offset two support rods 30 releasably fixed. The carrying poles 30 extend parallel to the axis of rotation 3 the rotor shaft 2 , On the carrying poles 30 are holders 31 threaded and clamped. The axial distance of the brackets 31 is through the carrying bars 30 surrounding sleeves 32 fixed. To the brackets 31 are pivoting arms pointing in opposite directions 33 hinged, the end sliding contacts 34 made of graphite. The sliding contacts 34 are by tension springs 35 against the outer surface 36 the outer rings 15 pressed.

From the swivel arms 33 from not shown electrical connections extend to a cable gland 37 in the front wall 6 of the stator housing 8th ,

The bearing designed as a floating bearing 4 is through a snap ring 38 in the front wall 6 established. It is also against an inner ring collar 39 the front wall 6 , The other rolling bearing 5 is a fixed camp on the one hand via a snap ring 40 as well as a ring collar 41 on the rotor shaft 2 and on the other hand, one by screws 42 on the front wall 7 fixed lid 43 as well as a ring collar 44 on the front wall 7 fixed.

1

A slip ring transmission

2

cave rotor shaft

3

Rotation axis v. 2

4

roller bearing

5

roller bearing

6

Front wall v. 8th

7

Front wall v. 8th

8th

stator

9

Coat of v. 8th

10

Screws f. 9

11

Collar on 2

12

insulating bush

13

Turn on 2

14

inner rings

15

outer rings

16

outer surface v. 14

17

inner surface v. 15

18

Distance between 16 u. 17

19

insulating rings

20

Grooves in 16

21

Areas next to 20

22

Multilams

23

Stege v. 22

24

Crowning v. 22

25

Screws f. 26

26

disc

27

Radial collar on 12

28

Contact Termination

29

Cable gland

30

support rods

31

Mounts on 30

32

Pods up 30

33

swing arms

34

sliding contacts

35

Tension springs on 33

36

outer surface v. 15

37

Cable gland

38

Snap ring f. 4

39

Ring collar on 6

40

Snap ring f. 5

41

Ring collar on 2

42

Screws f. 43

43

Cover on 7

44

Ring collar on 7

Claims (6)

Slip Ring Transformer ( 1 ), the at least one in an insulating material ( 12 ), which is part of a rotor shaft ( 2 ), embedded inner ring ( 14 ) of a non-ferrous metal and an inner ring ( 14 ) forming a groove ( 20 ) with radial spacing ( 18 ) surrounding outer ring ( 15 ) made of graphite, by lateral insulating materials ( 19 ) to the inner ring ( 14 ) concentrically arranged and with the inner ring ( 14 ) through the groove ( 20 ) bridging metallic contact blades ( 22 ) is electrically coupled, wherein the outer ring ( 15 ) at least one sliding contact consisting of graphite ( 34 ) which is resiliently connected to the outer surface ( 36 ) of the outer ring ( 15 ) and with the stator housing ( 8th ) is pivotally connected. Slip ring transmitter according to claim 1, wherein the contact blades ( 22 ) in the groove ( 20 ) in the outer surface ( 16 ) of the inner ring ( 14 ) fixed in position and between inner ring ( 14 ) and outer ring ( 15 ) against the inner surface ( 17 ) of the outer ring ( 15 ) are pressed resiliently. Slip ring transmitter according to claim 1 or 2, wherein the adjacent to the groove ( 20 ) ( 21 ) of the outer surface ( 16 ) of the inner ring ( 14 ) are gold plated. Slip ring transmitter according to one of the claims 1 to 3, the at least two each side by side on the rotor shaft ( 2 ) arranged inner rings ( 14 ) with the associated outer rings ( 15 ) and the outer rings ( 15 ) associated sliding contacts ( 34 ), in which the inner rings ( 14 ) with axial distance from each other in an insulating material ( 12 ) cast in the form of an insulating bush, the outer rings ( 15 ) by lateral insulating materials ( 19 ) in the form of insulating rings to each other and the sliding contacts ( 34 ) in pairs to each outer ring ( 15 ), wherein the sliding contacts ( 34 ) at the ends of pivot arms pointing in opposite directions (US Pat. 33 ) and an outer ring ( 15 ) associated swivel arms ( 33 ) to the swivel arms ( 33 ) of the adjacent outer ring ( 15 ) are circumferentially offset. Slip ring transmitter according to claim 4, wherein the insulating bushing ( 12 ) on a hollow rotor shaft ( 2 ) is fixed by gluing and the outer rings ( 15 ) and the insulating rings ( 19 ) axially on the inner rings ( 14 ) or the insulating bushing ( 12 ) and at the Isolierbuchse ( 12 ) are fixed in position. Slip ring transmitter according to claim 4 or 5, wherein the an outer ring ( 15 ) associated swivel arms ( 33 ) to a holder ( 31 hinged on a parallel to the axis of rotation ( 3 ) of the rotor shaft ( 2 ), in the stator housing ( 8th ) fixed support rod ( 30 ) is determined by clamping.