HK1120922B - Switch-on energy store apparatus - Google Patents

Description

Switching-on energy accumulator device

Technical Field

The invention relates to a contact energy store device for a circuit breaker, wherein the contact energy store is fastened at a first end and is connected at a second end to an eccentric of a pressure device, which interacts with a device defining the boundary of a resetting movement.

Background

Such a switch-on energy storage device for a circuit breaker is known from DE19503697C 1. The switch-on spring as a switch-on energy store is fixed at its first end and is connected at its second end to an eccentric on the pressure shaft and the switch shaft. In the clamping device for switching on the spring, the return latch is designed as a device which defines the return movement boundary; the return lock has a stop element and a free-wheeling bearing (Freilauflager) arranged on the lifting shaft sleeve and on the holding-down device wall. The sleeve is decoupled from the lifting shaft by a free-wheeling bearing during the clamping process. After the switching-on process of the circuit breaker, in which the energy stored in the switching-on spring is used to rotate the switching shaft, the direction of movement of the switching shaft and thus of the end of the switching-on spring can be reversed as a result of the kinetic energy. When this reversal takes place, the sleeve is rotated by the freewheel bearing until the stop element arranged on the sleeve abuts against the stop element arranged on the wall. If the two stop elements are in contact with each other, further movement is prevented. Such lost motion bearings are precision parts and therefore very costly.

Disclosure of Invention

The object of the present invention is to provide a switch-on energy accumulator of the type mentioned at the outset which can be constructed simply and inexpensively.

This technical problem is solved as follows: according to the invention, the device defining the boundary of the resetting movement has a ratchet mechanism arranged on the first end of the switch-on energy store. This arrangement is simple, inexpensive and at the same time wear-free in a preferred manner, since the resetting movement of the switch-on energy store is limited or prevented solely by the ratchet mechanism provided on the first end of the switch-on energy store.

In a suitable development, the means defining the boundary of the resetting movement comprise a guide element which triggers the ratchet mechanism, with which a first end of the switch-on energy store is movably supported on a fixed shaft by means of an elongated hole formed in the guide element and which is connected to a second end of the switch-on energy store. In this arrangement, it is advantageous that, due to the eccentric mounting of the second end of the switch-on energy store and the guide element mounted in the elongated bore, the movement path of the free end of the guide element during the switch-on process differs from the movement path after the switch-on process, so that, with the ratchet mechanism, on the one hand, the pressing of the switch-on energy store is achieved and, on the other hand, the boundary of the resetting movement is defined.

In a preferred embodiment, the ratchet mechanism has a movable pawl which is rotatable about a fixed axis between a first and a second position, the spring element acting on said pawl. The ratchet mechanism can be simply constructed by using such a pawl.

In a preferred embodiment, the fixed shaft and the spring element are held on the fixed element. In this arrangement, the pawl can be pivoted about the axis between its first and second positions in a simple manner by means of a spring element.

In one suitable embodiment, a stop element is provided on the guide part, which stop element interacts with a pressure recess on the pawl. By the arrangement of the stop element on the guide part and the interaction with the pressure recess, a simple possibility of deflecting the pawl from its first position into its second position is achieved.

In a further development, the pawl has a locking recess. During the reset movement of the switch-on energy store after the switching-on process, the stop element engages in the detent recess, so that the limit of the reset movement is formed in a simple and effective manner.

Drawings

The invention is explained in detail below with reference to the figures and with reference to embodiments thereof. In the drawings:

fig. 1 shows a schematic representation of a switch-on energy storage device in a first position, in which the switch-on energy storage device is compressed;

fig. 2 shows the switch-on energy storage device in a second position in a schematic illustration, in which the switch-on energy storage device is partially clamped;

fig. 3 shows the switch-on energy storage device in a third position in a schematic representation, in which the switch-on energy storage device is relaxed;

fig. 4 shows the switch-on accumulator device in a fourth position in a schematic illustration; and

fig. 5 shows the switch-on energy storage device in a fifth, i.e. locked position in a schematic view.

Detailed Description

Fig. 1 shows a switch-on energy storage device with a spring element 1 as a switch-on energy storage device, which is connected at a first end 2 to a stationary part 4 by means of a ratchet device 3 and at a second end 5 to an eccentric 6 in an articulated manner. The eccentric 6 and the cam 7 are fixedly arranged on a pressure shaft 8. The cam 7 interacts with a switching shaft 9, which is part of an actuating mechanism, not shown, for the disconnectable switching contacts of the circuit breaker. A guide element 10 with an elongated hole 11 and a stop element 12 is guided through the first end 2 of the switch-on energy storage device 1. The guide member 10 is rigidly connected to the second end 5 and is supported on the stationary member 4 by means of a shaft 13 extending through the elongated hole 11. The ratchet device 3 comprises a pawl 14, which is likewise rotatably mounted on the shaft 13, and a spring 15, which is fastened at its first end 16 to the pawl 14 and at its second end 17 to the fixed part 4. The dashed line a corresponds to the path of movement of the second end 5 during switching on and clamping of the energy store, while the dashed line B corresponds to the path of movement of the stop element 12 during switching on and clamping of the energy store. The movement path B is characterized by the dynamic arrangement of the system in that, when the stop element 12 moves from the top dead center of the switch-on energy store to the bottom dead center, it sweeps out a path different from the reverse movement, so that it can be latched to the pawl 14.

In fig. 1, the switch-on energy store is in the compressed state, wherein the spring element is subjected to compressive stress. The second end 5 is at the upper reversal point of its movement trajectory a, the stop element 12 is located in the vicinity of the upper inflection point of the movement trajectory B, and the shaft 13 is located on the lower stop of the elongated hole 11 of the guide member 10. The pawl 14 is held in the first position by the tension of the spring 15.

If the switching process is triggered, the energy stored in the switch-on energy store is transmitted via the eccentric 6 and the pressure shaft 8 to the cam 7 and thus to the switching shaft 9. The second end 5 is moved along the line a in the counterclockwise direction, while the stop element 12 is moved on the line B in the clockwise direction.

Fig. 2 shows the switch-on energy store 1 with the ratchet mechanism in a first position immediately after the switching process has been triggered, wherein the switch-on energy store 1 has been partially released. The energy of the switch-on energy store 1 causes the cam to rotate via the pressure shaft 8 and thus the movement of the switching shaft 9. The second end 5 is in the nine o' clock position on line a and the stop element 12 moves downwards on line B. The shaft 13 is located in relation to the elongated hole 11 in a position near the second end of the elongated hole 11 due to the movement of the guide member 10 connected to the second end 5.

Fig. 3 shows the switch-on energy accumulator in a completely released state, in which the second end 5 and the stop element 12 have reached the lower reversal point of the respective lines a and B. In this position, the shaft 13 is located at the upper end of the elongate bore. The stop element 12 rests in an L-shaped press recess 18 of the pawl 14. In this position, the stop element 12 moves the rotatably mounted pawl 14 away from the fastening part 4 against the spring force of the compressed spring 15.

Fig. 4 shows the position of the switch-on energy store 1 and the ratchet mechanism just at the end of the switching process of the circuit breaker. The cam 7 is not in contact with the switching shaft 9, the switching shaft 9 and thus the contacts of the circuit breaker being in a locked and on position. The cam 7 and the eccentric 6 are rotated past their reversal point by the energy of the switch-on energy accumulator 1, which is partially converted into kinetic energy during the switching process, wherein the guide part 10 is moved upwards and the stop element 12 is moved away from the contact recess 18 of the pawl 14. At this point, the pawl 14 returns to its first position by the tension of the spring 15. The switch-on energy store 1 is partially compressed by further rotation of the eccentric 6, so that a restoring movement of the switch-on energy store 1 takes place. This return movement is delimited by the pawl 14 being returned to its first position by the spring 15, as explained in connection with fig. 5.

Fig. 5 shows the position of the switch-on energy store 1 and the ratchet mechanism after the switching process of the circuit breaker with the latched stop element 12. The stop element 12 engages in the detent recess 19 of the pawl and is locked. This locking reliably prevents a further resetting of the switch-on energy store 1. As a result, the circuit breaker can be switched off again immediately and a new pressing operation can be started for switching on the energy store.

List of reference numerals

1-switch-on accumulator

2 first end of accumulator

3 ratchet wheel device

4 fixing part

5 second end

6 eccentric wheel

7 cam

8 compressing shaft

9 switch shaft

10 guide member

11 elongated hole

12 stop element

13 axle

14 ratchet pawl

15 spring

16 first end of spring

17 second end of spring

18 hold down recess

19 locking recess

A motion track of the second end

B motion track of stop element

Claims (6)

1. A contact energy storage device for a circuit breaker, comprising a contact energy storage device, which contact energy storage device (1) is fastened at a first end (2) and is connected at a second end to an eccentric (6) of a pressure device, which pressure device interacts with a device defining the boundary of a resetting movement, characterized in that,

the device (3, 10, 13, 14, 15) defining the return movement limit has a ratchet mechanism (3) arranged at the first end (2) of the switch-on energy store (1).

2. The switch-on energy accumulator device according to claim 1, characterized in that the means (3, 10, 13, 14, 15) defining the boundary of the resetting movement comprise a guide member (10) for triggering the ratchet mechanism (3), by means of which the first end (2) of the switch-on energy accumulator (1) is movably supported on a fixed shaft (13) by means of an elongated hole (11) formed in the guide member (10) and which is connected to the second end (5) of the switch-on energy accumulator (1).

3. The switch-on accumulator device according to claim 2, characterized in that said ratchet mechanism (3) has a movable pawl (14) rotatable about said fixed shaft (13) between a first position and a second position, on which a spring element (15) acts.

4. A switch-on accumulator means according to claim 3, characterized in that the fixed shaft and the spring element (15) are held on a fixed element (4).

5. The switch-on energy storage device according to claim 3 or 4, characterized in that a stop element (12) is provided on the guide part (10), which stop element interacts with a pressing recess (18) on the pawl (14).

6. The switch-on accumulator device according to claim 5, characterized in that the pawl (14) has a locking recess (19).