JPS585924A - Device for closing breaker - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit breaker operating mechanism, and more particularly to a circuit breaker closing device that closes the circuit breaker using a closing spring that is energized by a motor.

Generally, a spring-loading operating mechanism has a schematic configuration as shown in FIG. That is, a closing device 2 having a closing spring 1 is connected to a blocking section 4 via a link mechanism 3.

A cutoff spring 5 and a trip device 6 are connected to this link mechanism 3.

FIG. 2 shows details of a conventionally used charging device 2. Reference numeral 7 indicates a motor, and a crank 9 having a pin 8 at an eccentric position is fixed to the shaft of the motor 7. This crank 9 is connected to a lever 11 via a link 10 and a pin 12. This lever 11 is rotatably fitted into a bush 14 having a cylindrical outer periphery which is inserted into a square shaft 13, and a first pawl 15 is attached to the side surface of this lever 11 by a pin 16. In addition, the bushing 14 has a lever 17.
is rotatably fitted into the lever 17, and a second claw 18 is attached to the side surface of the lever 17 by a pin 19.

A train 20 is attached to the square shaft 13, and teeth 2OA are formed on the outer periphery of the train 20 to engage the first and second pawls 15 and 18. Note that even if the motor 7 rotates when the closing spring is fully charged, the first pawl 15 will not move the train 20.
A part 20B of the outer periphery of the train 20 is provided with a toothless part to prevent the train from moving. Since the electric train 20 is stacked with the square shaft 13 inserted into a square hole drilled in the center, the rotation of the electric train 20 also rotates the square shaft 13.

A cam 21 and a crank 22, which transmit operating force to the link mechanism 3 shown in FIG. 1 (details are omitted), are fitted into both ends of the square shaft 13 through respective square holes. A pin 23 is implanted in this crank 22, and this pin 23 is connected to the closing spring 1 via a spring holding rod 24. Further, although the cam 21 transmits operating force to the link mechanism 3, it is not mechanically connected to the beam shift mechanism 3. Furthermore, a limit switch 25 for turning on and off the motor 7 is arranged close to the crank 22, and a hook 26 for holding the closing spring 1 in the fully loaded position is arranged near the pin 23. ing. The closing spring 1 is supported at one end by a bracket 27 in order to maintain its stored force.

Note that return springs 28 and 29 are attached to the first and second pawls 15 and 18, respectively, and a return spring 30 is attached to the lever 17. Further, a stopper 31 is provided on the rotation path of the lever 17 to prevent the lever 17 from rotating. Furthermore, a bushing 14 fitted into the square shaft 13
is held by a bracket 32.

Next, the operation of the above conventional example will be explained. Figure 2 shows the case where the closing spring 1 is in a fully charged state.
In this state, move the hook 26 that is engaged with the pin 23 to the pin 2.
3, the crank 22, train 20, and cam 21 rotate together in the direction of arrow A in the figure due to the force of the closing spring 1. Then, the operating force of the cam 21 is transmitted to the shutoff section 4 via the link mechanism 3 shown in FIG. 1, and the shutoff section 4 is closed.

At the same time, the operating force of this cam 21 stores energy in the cutoff spring 5, and this stored state is maintained by the link mechanism 3.

When the crank 22 reaches the position shown in FIG. 3, the closing of the circuit breaker is completed and the closing spring 1 is completely released. However, the crank 22 rotates further due to the surplus energy of the closing spring, and is decelerated while accumulating the closing spring 1 and moves approximately in the position shown in FIG. With the accumulated force of , it rotates in the direction opposite to the direction A in FIG. This movement is stopped by the motor 7 via the first pawl 15, or by the stopper 31 via the second pawl 18.

On the other hand, when the crank 22 rotates and leaves the limit switch 25, the motor circuit is closed by this switch and the motor 7 begins to rotate. However, since the rotation by the closing spring 1 is fast, the motor 7 is located at the position shown in FIG. 4 with the crank 2.
When 2 moves, 1 moves only slightly with no load. After the crank 22 reaches the position shown in FIG. 4, the lever 11 moves up and down once for each rotation of the motor 7, and the first pawl 15 advances the train 20 in the eight directions of the one-tooth arrow. The electric train 20 that has been advanced is prevented from reversing by the second pawl 18. When this operation is repeated and the closing spring returns to the fully energized state shown in Fig. 2, the crank 2
2 touches the limit switch 25, the motor circuit is opened, and the motor 7 is stopped.

In addition, just before the closing spring becomes fully energized, the toothless portion 20B of the electric train 20 becomes the contact surface of the first pawl 15, so
No load is applied to the motor 7, and the motor 7 stops without being subjected to excessive force. This operation is performed regardless of whether the cutoff section 4 is opened or closed. When opening the shutoff section 4, the locking device of the link mechanism 30 is released by operating the tripping device 6 shown in FIG.
The blocking part 4 is opened by the blocking spring 5.

However, the conventional example described above has the following drawbacks. First, the electric train 20 rotates in the input direction after being inserted, and then reverses in the direction opposite to A at the position shown in FIG. 4 and collides with the first pawl 15 or the second pawl 18.

However, since the stopping position of the motor 7 is not constant,
There may be a case where the motor 7 has to absorb and stop the impact force due to the reversal energy of one tooth of the largest windmill 20. Therefore, it was necessary for the motor 7 to not only generate the necessary torque but also have mechanical strength so as to withstand the impact force. Second, for example, if it becomes necessary to increase the closing spring force, the capacity of the motor 7 may be increased or the wind turbine 2
This is achieved by increasing the reduction ratio by increasing the value of 0, resulting in increased dimensions and the need to change a large number of related parts.

In view of the above-mentioned drawbacks, an object of the present invention is to provide a closing circuit breaker that can significantly reduce the impact force applied to the motor when the closing spring is released, and can easily release the closing spring force without replacing parts such as the motor. We are in the process of providing equipment.

The above object of the present invention is to add one more pawl for preventing reverse rotation of the wind turbine, and to combine this pawl, other pawls already provided for preventing reverse rotation, and a pawl that is driven by a motor to rotate the wind turbine. This is achieved by attaching a spring to an energy accumulating member directly connected to the motor, which maintains the relationship of the three to the windmill constant when the motor is stopped.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a perspective view showing an embodiment of the circuit breaker closing device according to the present invention. However, the same components as those in FIG. 2 are indicated using the same reference numerals.

Since the structure of this embodiment is almost the same as that of the conventional example shown in FIG. 2, only its characteristic parts will be explained below. A spring 33 is newly attached to the lever 11 of this embodiment, which is arranged to move the lever downward. Furthermore,
A third pawl 34 is attached to the side surface of the lever 17 by a fulcrum pin 35, and a return spring 3 is attached to the third pawl 34.
6 is attached. In addition, the third claw 34, the fulcrum pin 35
and the return spring 36 are the second pawl 18, the pin 19, and the return spring 2.
The same parts as 9 are fine. The other configurations are completely the same as the conventional example.

The first pawl 15, the second pawl 18, and the third pawl 34 have a relationship as shown in FIG. 6 in the middle of charging the closing spring. That is, when the motor 7 pushes the closing spring 1 to the maximum, the first claw 15 is pushing the windmill 20, but at this time the second claw 15 is pushing the windmill 20.
In order to ensure that the pawl 18 enters the teeth of the windmill 20, the second pawl 18 is placed a few gears or a knob a in front of the first pawl 15, which is an arbitrary multiple of the interval between one tooth of the windmill 20. .

At the same time, in order to prevent the third pawl 34 from entering the teeth of the windmill 20, the third pawl 34 is spaced apart from the first pawl 15 by a size slightly larger than an arbitrary multiple of the interval between one tooth of the windmill 20. Deploy.

Next, the operation of this embodiment will be explained. As shown in FIG. 5, when the hook 26 is removed from the bin 23 with the closing spring fully loaded, the cutting portion 4 is loaded in the same manner as in the conventional structure. Then, the crank 22 moves to the same position as in the conventional example as shown in FIG.
Uke is stopped. This is because the crank 9 attached to the motor 7 is always returned to the normal position shown in FIG. 5 by the spring 33 after it has stopped, and the relationship between the claws is as shown in FIG. 6.

Therefore, the reason why the impact force may be applied to the first claw 15 is that the distance between the tooth mountain portion of the wind turbine 20 and the third claw 34 is
This occurs only when the rotation is reversed between the small gaps shown in the figure, and in other cases, an impact force is applied to the third pawl 34. However, if the windmill 2o reverses at an interval smaller than b interval,
Since the 5th dimension can be made a small ratio to the 1-tooth spacing of the wind turbine 2o, even if the rotation is reversed within the 10,000-b dimension, the first claw 1
The impact force that 5 receives is small and close to a static value, so there is no problem. Furthermore, when the crank 22 rotates and separates from the limit switch 25, the motor 7 starts to rotate, but since the speed of the motor 7 is generally very slow compared to the rotation of the windmill 20 caused by the closing spring 1, the reversing force is At the time of receiving, the position of the first claw 15 hardly changes.

Now, when the motor 7 begins to rotate, the barb 33 begins to store energy, but at the time of the first half rotation of the motor 7, most of the spring force is received by the third pawl 34, so the maximum load torque by the spring 33 is applied to the motor 7. No problem will occur if the output is within the output. During the next half-rotation, the first pawl 15 pushes the windmill 20, so the closing spring force is applied to the motor 7, but at this point the force of the spring 33 acts in the direction of accumulating the closing spring 1, so the motor 7 is loaded. is the spring 33 due to the torque due to the closing spring force,
It is the value obtained by subtracting the output torque due to , and the motor load is reduced. The same operation occurs after the second rotation of the motor 7, but the second pawl 18 prevents reverse rotation due to the positional relationship of the pawls. When such operations are repeated and the state shown in FIG. 5 is reached, the motor 7 stops and the charging of the closing spring 1 is completed.

According to this embodiment, the third pawl 34 is attached to the lever 17 that prevents the wind turbine 20 from being reversed by the stopper 31, and moves reciprocally in conjunction with the motor 7, and the provided pawl 28 rotates the wind turbine 20 in one direction. A spring 3 is attached to a lever 11 that rotates each tooth.
3 is installed, and when the motor 7 stops, the spring 33 always keeps the first, second, and third claws 15, 18, 3 against the wind turbine 20.
3 in the positional relationship shown in FIG.
By stopping the impact force generated when the motor is reversed from being received by the stopper 31 via the third pawl 33, the impact force is prevented from being transmitted to the motor 7, and the mechanical strength of the motor 7 is designed to be small. This has the effect of reducing costs and making the device more compact. Furthermore, since the spring 33 acts in the direction of accumulating energy in the closing spring 1 while the motor 7 is accumulating energy in the closing spring 1, it has the effect of equalizing the load on the motor 7 and reducing the maximum torque of the motor 7. be. Therefore, when increasing the closing spring force, the effect can be achieved simply by adjusting the force of the spring 33 without replacing parts such as the motor 7.

As is clear from the above description, according to the present invention, one more claw is provided to prevent the windmill from reversing, and when the motor 7 is stopped, the positional relationship between this additional claw and the already provided claw with respect to the windmill is maintained. By providing a spring that always maintains a predetermined value in the energy storage member directly connected to the motor, the impact force applied to the motor when the closing spring is released can be significantly reduced, and the closing spring force can be reduced without replacing parts such as the motor. It is possible to provide a circuit breaker closing device that can easily increase the size of the circuit breaker.

[Brief explanation of drawings]

Claims (1)

[Scope of Claims] 1. A circuit breaker that has a closing spring whose power is stored by a train that is moved tooth by tooth by a pawl driven by a motor, and which releases the stored force of this closing spring at once to close the circuit breaker. In this closing device, two pawls are provided to prevent the train from reversing, and a closing spring energy storage member directly connected to the motor is provided with two pawls that are connected to the teeth of the train when the motor is stopped. A circuit breaker closing device characterized in that a spring member is attached to maintain a predetermined positional relationship at all times, and an impact force generated when a train reverses is received by a reversal prevention pawl so that it is not transmitted to a motor section. 2. The energy storage member is configured to store energy in the spring attached to the energy storage member when the motor is under a light load, and in the process of the motor storing energy in the closing spring, the energy stored in the spring is released to reduce the motor load. 2. The circuit breaker closing device according to claim 1, further comprising a spring attached to the spring.