HK1167738B - On-load tap changer with energy storage mechanism - Google Patents

Description

The invention relates to a load switcher with a force storage device for converting the continuous rotation of a drive shaft into a leaping, fast rotation of a drive shaft.

The principle is always the same: a rotating drive shaft tenses the spring or springs to a maximum point, after which they relax in a jumping manner and thereby move the drive shaft along with it. One such power storage is the DE 10 2006 008 338.

The aim is therefore to create a force storage system for such applications, which will achieve a targeted adaptation of the leap-like downforce movement to the specific requirements of the case.

It is already known from DE-AS 25 02 810 that an additional force storage device of the type mentioned above is provided for in the case of a force storage device. In addition to the actual force storage springs, an additional spring is provided for, which is tensioned by a knee joint when the force storage device is activated. This delay of the activated force storage device is achieved in the first part of the movement by tensioning this additional spring towards the end of the movement, when the actual force storage device is already as relaxed as possible, the additional springs are also relaxed, thus increasing the spring forces. This solution, which was known at the time, was designed specifically to reduce the release of the force storage device, so that it can be switched on at an alternating current of 16 2/3 Hz instead of the usual one.This known force storage is also mechanically complicated, in particular by the rolling guide and additional leverage to operate the additional force storage springs. It is also intended exclusively for a force storage in which a rotation of the drive shaft is first converted into a longitudinal motion in which the force storage springs are tightened and the fast longitudinal motion is then converted back into a fast rotation of the discharge shaft after their activation.

Another example of a load switcher with power storage is shown in WO-A-8908924.

The purpose of the invention is to specify a load switcher with a force storage device, whereby the force storage device has, in addition to the actual force storage spring or springs, additional means which lead to the targeted adjustment of the rotational motion of the drive shaft.

This problem is solved by the invention.

The invention is particularly advantageous in that it is designed in a simple way: a curved disc connected to the drive shaft in addition diverts a connecting part, which, depending on the current position of the curved disc, releases or releases an additional spring. The energy absorbed or released by the additional spring or springs specifically and as required delays or accelerates the rotation of the drive shaft while the actual force storage spring is relaxed.

The invention is explained in more detail below by means of a drawing. Figure 1 shows a first load switch with power storage in perspective, in a schematic representationFigure 2 shows a second embodiment of a load switch in the same wayFigure 3 shows schematic representations of different spring types in the context of the invention.

The components designated by reference numbers 1 to 12 are already known from the above-mentioned DE 10 2006 008 338 B3, but are explained here again in order to understand the overall function.

Figure 1 shows a support plate 1 on which all the power storage and gear arrangement of the load step switch are arranged. Furthermore, a drive shaft 2 is shown, which is connected to a gear 3 and drives it continuously. The gear 3 in turn drives a drive element 4 via its gear 5. The drive element 4 has symmetrical terminals that can correspond to a drive curve 6 and turn it. On top of the drive curve 6 a drive shaft 7 is stored, on which a drive shaft is located. The drive shaft 6 is attached to a drive shaft 8, which leads downwards through the vertical curve 1 to the contact barrier. The contacts attached to the shaft are not connected to the base of the bearing. The spring 9 is attached to a bearing rod 10 on one side and is horizontal by means of a vertical bearing bolt 11; one or more pressure springs are concentrically arranged around or in the spring 9 and only one pressure spring 12 is shown here.

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The invention also provides for a connection 15 having a roller 16 at one end which runs on the frontal contour 14 of the curve 13 transmission. The connection 15 is pivoted around a pivoting axis 17 and has at its other spring bearing, which is again pivoted, another rod head 18, which in turn has a guide rod, which is located at its other end in a spring tube against another bearing 19 by means of a 20 spring bearing 22 which is also pivoted between the other two ends, while a 21 spring bearing 22 is located at the other end.

The mechanism of action of this additional device is as follows: After the dead point is passed, the drive shaft 6 and thus the drive shaft 8 begin to rotate rapidly, as explained, the pressure spring 12 relaxes in a spring-like manner. With the drive shaft 8 the turntable 13 also rotates, thus the roller 14 running on its contour 16 and with it the entire connecting part 15 is deflected. This causes the spring 23 to be further stretched or relaxed. It reduces or increases the energy of the pressure spring 12 and thereby slows or accelerates the rotation of the pressure spring 13 and thus the drive shaft 8. Overall, this results in a rapid movement of the drive shaft 8 adapted to the kinematic requirements with the most optimized torque.

Figure 2 shows another embodiment of the invention. Here again a connecting part 15 is deflectable around a rotation axis 16 and again carries the rod head 18, which is here firmly connected to a spring bearing 24. Between this and the bearing buckle 19 a spring 25 is placed. Thus in this embodiment the direction of movement of the spring 25 is reversed from the embodiment shown in Figure 1. The spring 25 is fixed to the bearing buckle 19 and is tensioned by the spring bearing 24. The respective springs 23 and 25 shown in Figures 1 and 2 are therefore formed as pressure springs.

The invention also makes it possible to use draw spring instead, as shown schematically in Figure 3. The spatial arrangement of the rotation axis 17 of the connecting part 15 and the position of the roller 16 running on the contour 14 of the curved disc 13 on which the connecting part 15 is located alone make it possible to use different spring types. Figure 3a shows a draw spring 26 which can be deflected. Figure 3b shows a pressure spring 23, 25, which can be compressed. The invention also enables concentric arrangements of two or more such springs 23, 25 and 26 respectively.

The invention also includes a straight-line embodiment, which, irrespective of the specific design of the force storage spring, consists in the fact that a force storage spring is used to turn a drive shaft 8 in a spring-like direction after its activation and a curved disc 13 with a frontal contour 14 is attached to this drive shaft 8 to relax or tense another spring 23, 25 or 26 as required, thus deliberately affecting the speed of rotation by supplying or absorbing energy. At the end of the jump, the additional spring 23, 25 or 26 can be used to absorb excess kinetic energy and thus achieve smooth braking in a beneficial way. As already explained, energy can be absorbed either by pulling a draw spring 26 apart or by compressing a pressure spring 23, 25.

Claims (1)

1. On-load tap changer with a force store, wherein the force store comprises a drive element, which can be continuously drawn up by a drive shaft, and a driven part, wherein the drive element is disposed in mechanical connection with at least one force store spring which can be stressed when the drive element is drawn up and wherein the driven part can be triggered after the stressing of the at least one force store spring and abruptly rotates a driven shaft, characterised in that a cam disc (13) with an end-face profile (14) departing from circular shape is fastened to the driven shaft (8), that at least one further (additional) spring (23, 25; 26) is provided, that the at least one further spring (23, 25; 26) is fixed at one end thereof and articulated at the other end other thereof to a connecting part (15) pivotable about a fulcrum (17) that the connecting part (15) carries a rod head (18) having a guide rod which is fastened at the other end thereof to a bearing block (19), that spring counter-bearings (21, 22), between which the at least one further spring (23, 25; 26) is arranged, are disposed on both sides of the guide rod and that the connecting part (15) has at the free end thereof a roller (16) which runs on the profile (14) in such a manner that on rotation of the cam disc (13) the at least one further spring (23, 25; 26) can be stressed or relaxed in dependence on the profile (14).