DE7139089U - Slip ring apparatus - Google Patents

Description

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129/71 We.

Aktiengesellschaft Brown, Boveri 4 Cio, Baden (Switzerland)

Sole in the fringing apparatus

The present invention relates to a slip ring apparatus, which is particularly useful for a turbo generator suitable is.

Slip rings of large turbo generators that are intended for high currents have a dense brush covering on their surface. This results in a high concentration of power on the slip ring ob, erf lache _p which leads to a strong heating of the slip ring. The free cylindrical surface of the slip ring is aligned

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therefore at the given temperature differences Dissipation of the heat is not possible.

There has therefore already been a slip ring with an inner annular space and a large number of radially extending ones Bores, usually a few thousand per slip ring, suggested, but this is very expensive.

Ss is also already known dt the help of cooling fans to cool the sole Ifringapparat, which, however, as a result the relatively small heat-emitting surface requires a large fan power. '-

The purpose of the present invention is to create a slip ring apparatus de :? üia the aforementioned disadvantages the already known embodiments not aurvrsist, is relatively simple in construction and is a grosso cooling surface.

The slip ring apparatus according to the invention is thereby characterized in that the slip ring has at least approximately the shape of a hollow cylinder, the interior of which for Supply of a cooling gas is formed and that with at least one helically extending Slit is provided through the slip ring

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formed cavity connects in at least approximately radial direction with the slip ring outer side, and that connecting means are provided which prevent the slip ring from adhering to a certain degree of resistance hold together in the axial direction and at the same time for the electrical connection of in the axial direction of the slip ring spaced apart points of the latter are formed.

It is useful if the slip ring is at least on one end via a shrink ring on the slip ring shaft is attached.

It is advantageous if the slip ring is on the cooling inlet side is provided with an axial fan forming blades.

It is useful if the connecting means are made

extending in the axial direction of the slip ring

There are bolts or bars.

The invention is explained below with reference to the drawing, for example. Show it :

Figure 1 shows a longitudinal section through an exemplary embodiment of an inventive Slip ring apparatus ·; and

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Figure 2 to 4 perspective views of the inside of a part of different slip ring embodiments.

The slip ring apparatus shown in Figure 1 nines turbo generator is provided with a slip ring 1, the has the shape of a hollow cylinder and the interior of which is used to supply cooling air. The slip ring 1 is at one end via a tail pipe 2 electric isolated on the slip ring * elle 3 shrunk so that the slip ring 1 when heated during operation

can freely expand in the direction towards the free end and formed a large inlet opening for the cooling air

The slip ring I is shaped like a helix extending cooling slot 4 provided, which the cavity 5 formed by the slip ring 1 in the radial direction connects to the outside of the slip ring. In this way the cooling surface of the slip ring 1 is increased considerably, and the slip ring i itself acts as a fan by cooling air entering the cooling slot 4 through the cavity 5 in the latter in the circumferential direction of the Shaft 3 is accelerated and thus exposed to centrifugal forces that promote cooling air through the cooling slot to affect the outside world

In addition, on the entry side c it is through the slip ring enclosed cavity 5, an axial fan 6 is arranged.

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the one throughflow of the sole ring apparatus with Cooling air additionally supported. For further enlargement the cooling air and for sucking off the coal dust

also a cooling air suction fan connected via suction channels 7 are provided.

As can also be seen from Figure 1, are parallel to SoleifringweHe 3 extending bolts 8 provided, which the slip ring 1 while maintaining a certain slot width of, for example, 1 to 2 now in its Hold together in the axial direction and at the same time for the electrical connection of in the axial direction of the Slip ring 1 spaced apart points of the latter serve «The bolts 8 are to achieve a good mechanical and electrical connection soldered or welded into the recesses of the slip ring 1.

The slip ring 1 can also consist of an upright and helical shape wound flat steel piece exist, which extends with in the axial direction of the slip ring 1 sioh Bolt 8 is mechanically and electrically pre-tied by soldering or smoldering

It is also possible for the slip ring 1 to be helical stacked punched and slotted Bleohringstücksa consists, for example by soldering or Sohweissen are electrically and mechanically connected to one another.

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In FIGS. 2 to 4, various exemplary embodiments of the slip ring 1 are shown, with in FIGS. 2 and 3 a plurality of bolts 8 and, in FIG. 4, strips 9 soldered into grooves for stiffening purposes of the slip ring 1 and are provided for conducting current in the axial direction of the slip ring apparatus.

The through the cooling slot 4 and the slip ring outer surface 10 formed edges 11 serve to the foot surfaces of the burst " 12 can be smoothed out during operation as if with a scraping tool.

Claims (1)

129/71 1. Slip ring apparatus, especially for turbo generator, characterized in that the base ring (1; has at least approximately the shape of a hollow cylinder, the interior of which is designed for the supply of a cooling gas and which has at least one helical shape extending slot (4-) is vsrsshen, the the cavity (5) formed by the slip ring (1) in at least approximately a radial direction with the slip ring outer scythe ite connects, and that connecting means (8,9) are provided, which the slip ring (1) in compliance a certain slot width in its axial direction hold together and at the same time for the electrical connection of in the axial direction of the slip ring (1) distant points of the latter are formed. 2. Sole ring apparatus according to claim 1, characterized in that that the slip ring (1) at least at one end via a shrink ring (2) on the slip ring shaft (3) is attached. 3. Sole ring apparatus according to one or more of the preceding Claims, characterized in that de? Slip ring (1) made of a square and helical shape wound Flaohstahlstück consists, with βloh extending in the axial direction of the slip ring 129/71 Bolts (8) mechanically and electrically connected, for example by soldering or welding. 4 ·. Slip ring apparatus according to one or more of the preceding Claims, characterized in that the slip ring (1) on the cooling gas inlet side with an axial fan forming blades (6) is provided. · ScIiXe AfΓχββ £ * .χ) Τ) β.Γβ. ^ »uclCu θ JLiieni or ιζιθγι ^ θχ * θιχ (χθγ the claims, characterized in that the slip ring (1} bus helically stacked punched and slotted sheet metal ring pieces, for example by soldering or welding, electrically a and are mechanically connected to each other. 6. slip ring apparatus according to claim 2, characterized in that the slip ring (1) only at its one F-nde on the Slip ring shaft (3) attached and the other end is freely expandable. 7. Slip ring apparatus according to one or more of the preceding claims, characterized in that the connecting means consist of bolts (8) or strips (9) extending in the axial direction of the slip ring (1). 8. slip ring apparatus aach claim 7, characterized in that 129/71 that the bolts (8) or strips (9) in recesses of the sonle ring (1) soldered in or welded in are. AKTIENOESELLSCHAPT BROWN, BOVERI & CIE.