EP1320155A2 - Slip ring arrangement - 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 invention relates to a slip ring transmitter for the transmission of electrical Currents and / or signals between a stator and a rotor.

In slip ring transmitters of larger diameter it is known, the so-called Use coal / coal technology. This is the case with larger ones, for example Generators the case. To do this in the circumferentially closed The slip rings must be able to define slip rings for electrical contacts have large wall thicknesses, so that threads are sufficiently large can be accommodated.

Therefore, the use of coal / coal technology in slip ring transmitters with small diameters and slip rings closed on the circumference not possible.

To make the coal / coal technology smaller even with slip ring transmitters To be able to use diameter, you have the slip rings in individual Structured segments and each slip ring segment on a corresponding one Support body, especially made of brass, fixed by gluing.

In such designs there were gaps between those in the circumferential direction successive slip ring segments cannot be avoided. The gap led to electrical interference with the result that the transmission of Signals, especially measurement signals, was associated with inaccuracies.

The object of the invention is based on the prior art to create a slip ring transmitter that works even with a small Diameter in the coal / coal technology is economically producible and can be operated.

This object is achieved with the features specified in claim 1 solved.

Then an inner ring closed on the circumference is now made from one Non-ferrous metal, especially brass, in an insulating compound as a component embedded in a rotor. The insulating compound can, for example Be epoxy resin. The inner ring is assigned to the rotor electrical connection electrically contacted and from here with an end Cable gland connected.

On the circumferential side of the inner ring, a circumferentially closed one also extends Graphite outer ring. This outer ring is laterally through Insulating materials fixed that it is perfectly concentric with the inner ring is centered. Here is targeted between the inner ring and the outer ring a gap is formed, which the different when exposed to heat Expansion coefficients of e.g. Takes account of brass and graphite. The temperature range between the ambient temperature is up to the maximum permissible operating temperature.

To keep a perfect electrical coupling between the inner ring and to manufacture the outer ring by bridging the gap are circumferential of the inner ring provided metallic contact lamellae, which arranged the entire circumference of the inner ring or only over partial areas could be. These contact blades are designed so that they are in themselves themselves are resilient and in this way the changes in gap size between inner ring and outer ring due to heat effects without more can follow and constantly the electrical coupling between the inner ring and produce the outer ring.

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

The invention is associated with the particular advantage that the outer ring made of graphite not only small in wall thickness, but also small in diameter can be held. In this way it is possible to be compact Slip ring transmitters with outer diameters of 200mm and smaller ready to provide, in addition to signals, especially measurement signals, also electrical Currents up to about 50 amps can be transmitted.

In addition, the invention ensures that now speeds up can be reached at about 60 m / s.

It is also achieved with the invention that the sliding contact with only one comparatively small force must be pressed against the outer ring to ensure proper signal and / or power transmission. On low contact pressure leads to significantly less wear and tear ultimately to a longer service life of a slip ring transmitter. Moreover the abrasion is very low, so that inside the slip ring In principle, no pollution can occur and therefore no pollution electrical caused by abrasion-related contamination Short circuits can occur.

In order to give the contact lamella a secure hold on the inner ring, according to Claim 2 in the outer surface of the inner ring a circumferential groove incorporated. The contact blades are now in this circumferential groove distributed over the entire scope or embedded only in sections. There the contact lamellae have a central cambered section this section regardless of the size of the gap between the inner ring and outer ring constantly on the inner surface of the outer ring.

In particular, the contact lamellae are defined in the circumferential groove by clamping over bars located on the side of the crown.

Correct corrosion protection of the contact lamellae is accordingly Claim 3 achieved in that lying next to the contact blades Areas of the outer surface of the inner ring are gold-plated.

The measure of claim 4 also contributes to the fact that a perfect power and signal transmission can be guaranteed, without the need for high contact pressure of the sliding contact on the outer ring would.

A particularly advantageous embodiment of the invention is in the Features of claim 5 sees. Such an embodiment usually has several inner rings coaxially associated with each other and outer rings and sliding contacts assigned to the outer rings. The inner rings are in an insulating compound in the form of an insulating bush cast. The outer rings are insulated in the form of Isolation rings spaced apart. There are two sliding contacts on each outer ring pressed, which are attached to the ends of swivel arms. The Swivel arms point in opposite directions. To an axial to realize compact design are those assigned to each outer ring Swivel arms to the adjacent outer ring in the circumferential direction staggered. A mutual disruptive influence is on this Avoided way.

Each inner ring is via electrical connection lines embedded in the insulating bush to a contact connection at one end of the insulating bush guided. Lines then lead from this contact connection to one front cable gland on the rotor.

According to the features of claim 6, the insulating sleeve is on one Hollow shaft of the rotor is fixed by gluing. This is preferably done only on the ends of the insulating bush. For this is a length section of the hollow shaft, which can be made of steel or another material, approximately middle length range of the insulating bush on the circumference with a smaller one Diameter. The outer rings and the insulating rings are one End of the insulating bushing one after the other on the inner rings or Insulated sleeve pushed. For this purpose, the insulating bush has one at one end collar on the circumference. At the other end, a disc is against the last insulating ring clamped, so that then all outer rings and insulating rings are securely fixed in position. The hollow shaft can be in via end bearings Front walls of the stator be mounted.

The swivel arms assigned to each outer ring are each attached to a holder hinged. This bracket is on a parallel to the axis of rotation of the rotor extending, fixed in the stator support rod by clamping established. The support rod can, for example, in the end walls of the Stator. The successive brackets are through the spacer sleeves surrounding the support rod are positioned.

Figur 1

in der Stirnansicht einen Schleifringübertrager;

Figur 2

einen vertikalen Längsschnitt durch die Darstellung der Figur 1 entlang der Linie II-II in Richtung der Pfeile lla gesehen und

Figur 3

in vergrößerter Darstellung den Ausschnitt III der Figur 2.

The invention is explained in more detail below on the basis of an exemplary embodiment illustrated in the drawings. Show it:

Figure 1

in the front view a slip ring transmitter;

Figure 2

seen a vertical longitudinal section through the representation of Figure 1 along the line II-II in the direction of the arrows 11a and

Figure 3

in an enlarged view, section III of FIG. 2.

1 in FIGS. 1 to 3 is a slip ring transmitter for the transmission of referred to electrical currents and / or signals.

The slip ring transmitter 1 has a hollow shaft 2 made of steel as a component of a rotor 3. Rolling bearings 4, 5 are provided at the end of the hollow shaft 2, which are inserted into end walls 6, 7 of a stator 8. girth the end walls 6, 7, a cylindrical jacket 9 is fastened by screws 10.

On the hollow shaft 2 is an insulating compound up to the stop on a collar 11, in particular epoxy resin, pushed in the form of an insulating bush 12 and attached by gluing. The gluing takes place only at the ends of the Insulating bushing 12. The insulating bushing is in the approximate middle length range 12 provide the hollow shaft 2 with a circumferential recess 13.

A total of nine inner rings 14 are made on the circumference of the insulating bushing 12 Cast in brass. As can be seen here in particular in FIG. 3, the inner rings 14 have the same outer diameter as the insulating bush 12 on. An outer ring 15 is located on the circumference of each inner ring 14 Graphite. Between the outer surface 16 of the inner ring 14 and the inner surface 17 of the outer ring 15, a gap 18 is present, the different coefficients of thermal expansion of the materials of the inner ring 14 and the outer ring 15 are taken into account. The orientation each outer ring 15 is made via lateral insulating materials, 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 have circumferential grooves introduced into their outer surface 16 20. The areas 21 of the outer surfaces 16 next to the Circumferential grooves 20 are gold-plated. In the circumferential grooves 20 are, like the figure 3 reveals in more detail, contact blades 22 used. These contact blades 22 have lateral webs 23 and a central crowning 24. About the Web 23 are the contact blades 22 in the circumferential grooves 20 by clamping fixed in position. The crowns 24 are permanently on the inside Surfaces 17 of the outer rings 15. Because of this design, everyone Gap size between the inner rings 14 and the outer rings 15 a contact the inner rings 14 with the outer rings 15 via the contact plates 22 ensured.

The axial position fixing of the outer rings 15 and the insulating rings 19 takes place by means of a screw 25 on the end of the insulating bushing 12 Disc 26, which the insulating rings 19 and outer rings 15 against a radial collar 27 of the insulating bush 12 presses.

Each inner ring 14 is in a manner not shown with a contact connection 28 connected in the radial collar 27 of the insulating sleeve 12. About this Contact connection 28 then makes an electrical connection to one provided on the face of the hollow shaft 2 cable gland 29.

Two are offset in the circumferential direction in the end walls 6, 7 of the stator 8 Support rods 30 releasably set. The support rods 30 extend parallel to the axis of rotation 45 of the rotor 3. Are on the support rods 30 Brackets 31 threaded and clamped. The axial distance of the Mounts 31 is fixed by sleeves 32 surrounding the support rods 30. At the brackets 31 are facing in opposite directions Swivel arms 33 articulated, the end sliding contacts 34 made of graphite wear. The sliding contacts 34 are by tension springs 35 against the outer Surface 36 of the outer rings 15 pressed.

From the swivel arms 33 extend not shown electrical connections to a cable gland 37 in the end wall 6 of the stator 8.

The roller bearing 4 designed as a floating bearing is in the by a snap ring 38 End wall 6 set. It also lies against an inner ring collar 39 the end wall 6. The other roller bearing 5 is on the one hand as a fixed bearing a snap ring 40 and an annular collar 41 on the hollow shaft 2 and on the other via a fixed by screws 42 on the end wall 7 Cover 43 and an annular collar 44 fixed to the end wall 7.

REFERENCE NUMBERS

1 -

A slip ring transmission

2 -

hollow shaft

3 -

rotor

4 -

roller bearing

5 -

roller bearing

6 -

Front wall v. 8th

7 -

Front wall v. 8th

8th -

stator

9 -

Coat of 8th

10 -

Screws f. 9

11 -

Collar on 2nd

12 -

insulating bush

13 -

Unscrew on 2nd

14-

inner rings

15

outer rings

16 -

outer surface v. 14

17 -

inner surface v. 15

18 -

Gap between 16 and 17

19 -

insulating rings

20 -

Circumferential 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 -

Sleeves on 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 2nd

42 -

Screws f. 43

43 -

Cover on 7

44 -

Ring collar on 7

45 -

Axis of rotation v. 3

Claims (7)

Slip ring transformer, the at least one in an insulating compound (12) Part of a rotor (3) embedded inner ring (14) from a Non-ferrous metal and the inner ring (14) to form one Gap (18) with a radial distance surrounding outer ring (15) made of graphite having lateral insulating masses (19) to the inner ring (14) concentrically centered and with the inner ring (14) through the gap (18) bridging metallic contact lamellae (22) is electrically coupled, at least one made of graphite on the outer ring (15) Sliding contact (34) as part of a stator (8) is pressed. Slip ring transmitter according to claim 1, wherein the contact blades (22) in a circumferential groove (20) in the outer surface (16) of the inner ring (14) fixed in position and by bridging the gap (18) 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, in which the next to the contact blades (22) lying areas (21) of the outer Surface (16) of the inner ring (14) are gold-plated. Slip ring transmitter according to one of claims 1 to 3, in which the sliding contact (34) resiliently against the outer surface (36) of the Outer ring (15) is pressed. Slip ring transmitter according to one of claims 1 to 4, the at least two inner rings (14) and coaxially assigned to each other Outer rings (15) and sliding contacts assigned to the outer rings (15) (34), in which the inner rings (14) with an axial distance cast into one another in an insulating compound (12) in the form of an insulating bush, the outer rings (15) by insulating materials (19) in the form of Isolating rings spaced from each other and the sliding contacts (34) in paired assignment to each outer ring (15) are pressed, the Sliding contacts (34) at the ends of in opposite directions pointing swivel arms (33) and an outer ring (15) assigned swivel arms (33) to the swivel arms (33) of the adjacent outer ring (15) are offset circumferentially. Slip ring transformer according to claim 5, wherein the insulating bush (12) on a hollow shaft (2) is fixed by gluing and Outer rings (15) and the insulating rings (19) axially on the inner rings (14) or the insulating sleeve (12) is pushed and fixed in position on the insulating sleeve (12) are. Slip ring transmitter according to claim 5 or 6, in which the an outer ring (15) assigned swivel arms (33) to a holder (31) are articulated on a parallel to the axis of rotation (45) of the rotor (3) extending, in the stator (8) fixed support rod (30) is fixed by clamping.

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