Patent Application
20080047813
The drawings show schematically and in exemplary manner in:
In the figures, identical or equivalent parts are provided with identical or similar reference numbers.
According to the invention, the auxiliary gear 5 to 11 comprises a monoblock 5, in which holding means 5a and guiding means 5b for toothed rack drive 6 to 8 are constructively integrated. The monoblock represents a monolithic assembly, which may be fitted as a complete single-piece unit or may be equipped with elements before it is fitted as a complete unit in the breaker. Exemplary embodiments of such will be described in the following.
The monoblock 5 should comprise a holding means 5a, in which a bearing is provided for at least one cogwheel 6 of the toothed rack drive 6 . . . 8; and/or the monoblock 5 should comprise in its guiding means 5a one guide slide bearing 9, 11 and one sliding contact 10 for the arcing contact piece 3a that is driven by auxiliary gear 5 . . . 11; and/or the monoblock 5 should be connected in electrically conductive manner to the externally arranged nominal current contact 3b in order to draw current from the arcing contact piece 3a.
The monoblock 5 advantageously forms a single assembly unit 5, which may be inserted into the circuit breaker 1 completely as a single unit, and/or the monoblock 5 is constructed as a single-piece unit. In particular, the monoblock 5 may be a single-piece cast part 5.
In order to make installation of the monoblock 5 on circuit breaker 1 as simple as possible, only a single mounting fixture 5c, 5d is present. As is shown in the example, the monoblock 5 may have exactly one mounting flange 5c, which is attachable to exactly one mating flange 5d on the circuit breaker 1.
In an advantageous configuration, a pusher guide slide bearing 11 is recessed directly in the arcing contact piece 3a that is driven by the auxiliary gear 5 . . . 11. This reduces the danger of tilting even during single-sided driving, as will be described below. Alternatively or in addition, a fixed guide slide bearing 9 may be recessed in the guiding means 5b of the monoblock 5 for guiding the arcing contact piece 3b that is or may be driven by the auxiliary gear 5 . . . 11. This combination of the features of the guide slide bearing 9, 11, in particular the combination of a pusher guide slide bearing 11 in the rear part of the arcing contact piece 3a, which faces away from the arcing zone, with a fixed guide slide bearing 9 in the front part of the arcing contact piece 3a, which faces towards the arcing zone, may also be implemented regardless of the construction as a monoblock.
In a further advantageous configuration, the toothed rack gear 6 . . . 8 has exactly one gearwheel 6, exactly one first toothed rack 7 for driving the gearwheel 6, and exactly one second toothed rack 8 for moving the second arcing contact 3a. In such a case, adjustment screws are no longer needed to ensure that several driving toothed racks are adjusted to be flush with each other.
Insulation nozzle 4 is advantageously movable and serves for transmitting force from the circuit breaker drive to the auxiliary gear 5 . . . 11. The first toothed rack 7 is attached to the insulation nozzle 4. The first toothed rack 7 is preferably constructed such that it may be screwed into the insulation nozzle 4, with the axial distance D between its cogging 7b and the insulation nozzle 4 being adjustable. Moreover, adjusting screws on the first toothed rack 7 for adjusting the length of first toothed rack 7 should be absent. In fact, the length of the toothed rack need not be adjusted in the construction with only one toothed rack 7 either, provided precisely defined distances are maintained between the insulation nozzle 4 and the cogging 7b. This may be realized particularly easily in the construction of the monoblock.
For this purpose, in an advantageous embodiment, a limit stop 30a, 50a is provided for the arcing contact piece 3a that is driven by the auxiliary gear 5 . . . 11. This limit stop 30a, 50a may be created by providing a shoulder 30a (protruding or recessed) on the arcing contact piece 3a, which shoulder cooperates with an opposing shoulder 50a (protruding or recessed) on the monoblock 5 in such manner, that an end position is defined for the arcing contact piece 3a, when it is fully inserted, which end position corresponds to a desired, predeterminable distance to the opposing arcing contact piece 3b or to the insulation nozzle 4, respectively.
A further object of the invention is an electrical circuit breaker 1 for a power supply network with an interrupter unit as described above. The circuit breaker may, in particular, be a gas-blast circuit breaker or a self-blast circuit breaker; and/or a high-voltage circuit breaker 1 or a high-current circuit breaker, or generally a power circuit breaker; and/or a life tank circuit breaker, an encapsulated circuit breaker as dead tank breaker or for a gas-insulated switchgear assembly, or a hybrid circuit breaker.
Another object of the invention relates to a method for assembling the circuit breaker 1 with an interrupter unit as described previously. In this context, the insulation nozzle 4 is pre-assembled with the at least one toothed driving rack 7 in the circuit breaker 1. According to the invention, the following assembly steps are performed: (i) Inserting the arcing contact piece 3a that is driven by auxiliary gear 5 . . . 11 into the monoblock 5 as far as limit stop 30a, 50a; (ii) Inserting the monoblock 5 into the circuit breaker 1 until mounting fixtures 5c, 5d come in touch with one another; and (iii) using the mounting fixtures 5c, 5d to secure monoblock 5 inside the circuit breaker 1. The toothed rack transmission 6 . . . 8 may thus be adjusted and set particularly easily due to the construction as a monoblock.
| Number | Date | Country | Kind |
|---|---|---|---|
| 06405301.0 | Jul 2006 | EP | regional |
