JP2002289072A - Circuit breaker operation mechanism - Google Patents

Abstract

(57) [Problem] To provide a simple structure having a small number of parts around a control lever and having no trouble even if the spiral spring is over-charged or under-charged due to manual charge. Provide a highly reliable circuit breaker operation mechanism. A driving force transmitting shaft fixed to an inner end of a spiral spring, an energy storing gear fixed to an outer end of the spiral spring, and a notch integrated with the energy storing gear are provided. , A control lever 5 for performing ON / OFF control of a micro switch 8 for rotating the energy storage gear 2, and a roller 6 thereof. The lever guide 21 provided in the notch of the guide ring 4 rotates integrally with the energy storage gear 2 and the guide ring 4 by the rotational inertia force of the energy storage gear 2 at the end of the closing operation, and the roller of the control lever 5 is rotated. 6 is guided from an inner position inside the guide ring 4 to an outer position on the outer periphery of the guide ring 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker operating mechanism, and more particularly, to a circuit breaker operating mechanism using a spiral spring as a power source for closing operation.

[0002]

2. Description of the Related Art Hitherto, as an operation mechanism of a circuit breaker, a large number of mechanisms employing a rotational torque output mechanism advantageous for miniaturization and high efficiency have been proposed, for example, disclosed in Japanese Patent Publication No. Hei 8-21292. As described above, a mechanism using a compression spring has been proposed, but various studies have been made to further reduce the size and increase the efficiency of the driving force. Among them, a mechanism using a mainspring spring, a spiral spring, or the like is promising.

FIG. 4 is an exploded perspective view showing an example of a conventional operation mechanism of a circuit breaker using a spiral spring, and FIG. 5 is an enlarged front view showing a main part thereof. The outer end of a spiral spring (closed spring) 1 which is a power source for the closing operation of the circuit breaker is fixed to the energy storage gear 2, and the inner end of the spiral spring 1 is fixed to a shaft 3 for transmitting the driving force. . A guide ring 4 for controlling the energy storage is integrated with the energy storage gear 2. A roller 6 of a control lever 5 is rotatably pressed against the outer periphery of the guide ring 4 by the urging force of a spring (not shown). Have been.

The control lever 5 is turned on / off by a micro switch 8 which is a power source of a motor 7 for rotating the energy storage gear 2.
It is provided for performing F control. That is, when the roller 6 is located at an external position on the outer periphery of the guide ring 4, the control lever 5 turns on the micro switch 8 to rotate the energy storage gear 2 by the driving force of the electric motor 7 to rotate the spiral spring 1. When the roller 6 moves to the inner position inside at the cutout portion of the guide ring 4, the micro switch 8 is turned off to end the storage of the spiral spring 1.

[0005] The guide ring 4 is provided with a striker 9 for controlling the operating position of the roller 6 of the control lever 5 in the notch. On the other hand, a push-up cam 10 is provided integrally with the shaft 3.
And the roller 6 is pushed up to an external position on the outer circumference of the guide ring 4.

The shaft 3 is also provided with a closing cam 11 integrally therewith. The closing cam 11 rotates integrally with the shaft 3 during the closing operation to close the main lever 12 connected to the main contact. It is designed to be moved to a position. In the vicinity of the closing cam 11, a sea prop 13 and a closing catch 14 for engaging the closing cam 11 and fixing the shaft 3 in a stationary state when the spiral spring 1 is charged are provided. In addition, each member 1-14 as mentioned above
Are mounted on two frames 15,16.

[0007] Further, as shown in FIG.
Is rotatably attached to the frame 15 (FIG. 4) by pins 17. One end of a lever 18 is connected to an end of the control lever 5 opposite to the roller 6, and the lever 18 is linearly operated in accordance with the turning operation of the control lever 5. At the other end, the microswitch 8 is turned ON / OFF mechanically. Reference numeral 19 in the figure is a guide rod for guiding the linear movement of the lever 18.

FIGS. 6A and 6B are explanatory diagrams showing the operation of the operating mechanism of the circuit breaker as described above. FIG. 6A shows a state in which the spiral spring has been charged, FIG. 6B shows a state in which the spiral spring has been charged, and FIG. ) Indicates a state during the closing operation. Hereinafter, with reference to FIG. 6 and FIG. 4, the spiral spring energy storage and the closing operation will be sequentially described.

First, at the start of the energy accumulation of the spiral spring 1, the roller 6 of the control lever 5 is located at an external position on the outer periphery of the guide ring 4, as shown in FIG.
The micro switch 8 is turned on, and as shown in FIG.
The energy storage gear 2 rotates counterclockwise in the figure by the driving force of the electric motor 7, and energy storage is started by rotating the outer end of the spiral spring 1 in the same direction. In this case, the shaft 3 fixed to the inner end of the spiral spring 1 is fixed in a stationary state because the closing cam 11 integrated with the shaft 3 is engaged with the sea prop 13 and the closing catch 14.

Guide ring 4 integrated with energy storage gear 2
With the rotation of, the roller 6 of the control lever 5 rotates while being driven by the outer peripheral surface of the guide ring 4. And FIG.
6A, when the roller 6 of the control lever 5 comes into contact with the tip of the striker 9 provided in the notch of the guide ring 4 as shown by a two-dot chain line, as shown in FIG. Then, the roller 6 moves inward from the notch of the guide ring 4 while pushing up the striker 9 and reaches the inner position. As a result, the micro switch 8 is turned off, the electric motor 7 and the energy storage gear 2 stop, and the energy accumulation of the spiral spring 1 ends.

Next, when performing the closing operation from the above-described state of accumulation of energy, the closing catch 14 rotates clockwise by an electromagnetic coil (not shown) to release the sea prop 13 and the closing cam 11 rotates. It becomes possible. As a result, the sea prop 13 is pushed clockwise in FIG.
The shaft 3 and the closing cam 11 rotate counterclockwise in the figure. In this case, the closing cam 11 rotates the main lever 12 connected to the main contact to the closing position and then makes one rotation to return to the original position.

On the other hand, the push-up cam 10 integrated with the shaft 3 pushes the roller 6 of the control lever 5 located inside the guide ring 4 outward at the same time as the closing operation starts. In this case, the roller 6 moves on the outer surface of the striker 9 so as to push the striker 9 outward, and returns to the external position on the outer periphery of the guide ring 4. As a result, the microswitch 8 is turned ON, and the energy of the spiral spring 1 is started for the next closing operation.

Accordingly, the energy storage start position of the energy storage gear 2 and the guide ring 4 is slightly rotated counterclockwise from the position shown in FIG. 6C, and the roller 6 of the control lever 5 is moved from the striker 9 by the guide ring. 4 is a position on the outer circumference. Therefore, the rotation amount of the energy storage gear 2 and the guide ring 4 in one energy storage is rotated counterclockwise from such an energy storage start position, and as shown in FIG. The rotation amount is about one rotation or less until the roller 6 comes into contact with the tip of the roller.

[0014]

However, the conventional operation mechanism of a circuit breaker as described above has the following problems. First, the roller 6 of the control lever 5 moved to the inner position inside the guide ring 4 is pushed up to the outside of the striker 9 at a high speed by the push-up cam 10 integrated with the shaft 3. Adjustment is complicated. In this case, around the control lever 5,
Guide ring 4, striker 9, and push-up cam 1
Since a number of members performing different operations such as 0 are combined, the number of components around the control lever 5 increases, and the structure is complicated.

Although not shown in FIGS. 4 to 6,
In addition to the energy storage of the spiral spring by the electric motor 7, a manual energy storing means for manually accumulating the spiral spring in case of an emergency or the like is provided. If the spiral spring is excessively charged due to such manual charging, or if the charging is insufficient due to backlash of the charging gear, the roller 6 of the control lever 5 is pushed up to the outside of the striker 9. As a result, there is a possibility that the roller 6 may be deformed or damaged.

The present invention has been proposed to solve the above-mentioned problems of the prior art.
Reliable circuit breaker operation with a simple structure with a small number of parts around the control lever and no problems even if the spiral spring is over-charged or under-charged due to manual charging Is to provide a mechanism.

[0017]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for controlling the roller position of a control lever by simply rotating a guide ring and a lever guide provided in a notch thereof. By doing so, it is possible to reduce the number of parts around the control lever and to have a simple structure, but to prevent problems such as breakage of the roller even if overloading or insufficient charging of the spiral spring due to manual charging occurs. It was made.

An operating mechanism of a circuit breaker according to the present invention is fixed to an inner end of a spiral spring which is a power source for closing operation of the circuit breaker and transmits a driving force, and is fixed to an outer end of the spiral spring. Gear for accumulating a spiral spring, a guide ring with a notch integrated with the energy storage gear, and ON / OF of a motor power supply for rotating the energy storage gear
A control lever that performs F control, and a roller attached to one end of the control lever and pressed against the outer periphery of the guide ring. When the roller is at an external position on the outer periphery of the guide ring, When the electric power of the electric motor is turned on by the control lever and the energy storage gear is rotated to accumulate the spiral spring, and the roller moves to the internal position inside from the external position at the cutout portion of the guide ring. Turn off the motor power by the control lever
In the operation mechanism of the circuit breaker configured to perform the closing operation by rotating the shaft by the release of the spiral spring at the time of closing operation, and closing the charging operation of the spiral spring, the following features are provided. It has.

The operating mechanism of the circuit breaker according to the first aspect is disposed so as to overlap the notch of the guide ring,
A lever guide is provided that guides the roller from the internal position to the external position by rotating integrally with the energy storage gear and the guide ring by the rotational inertia force of the energy storage gear at the end of the closing operation. A bottom portion that holds the roller at the internal position, a top portion that is located outside the outer peripheral surface of the guide ring or more, and a guide surface that includes an inclined portion that is inclined from the bottom portion toward the top portion,
During rotation, the guide surface pushes the roller outward to move the roller to the external position on the outer periphery of the guide ring.

With this feature, by rotating the lever guide by the rotational inertia force of the energy storage gear at the end of the closing operation, the roller at the inner position is moved to the outer position on the outer periphery of the guide ring by the lever guide. It can be moved reliably. In addition, since the guide ring is merely combined with a lever guide that rotates integrally with the guide ring, the number of parts around the control lever is small, the structure is simple, and the over-energization of the spiral spring due to manual energy storage and Even if the accumulation of energy is insufficient, an excessive load is not applied to the roller, so that there is no problem such as breakage of the roller.

According to a second aspect of the present invention, in the circuit breaker operating mechanism according to the first aspect, the control mechanism rotates integrally with the shaft during a closing operation before the rotational inertia force of the energy storage gear acts, and A switch cam is provided that pushes up a roller of the lever from the internal position to the outside and moves the roller to an intermediate position inside the external position.When the control lever moves the roller from the internal position to the intermediate position, It is characterized in that the power supply of the electric motor is turned on and the energy storage gear is rotated to accumulate the energy of the spiral spring.

With this feature, even if the circuit breaker performs an incomplete closing operation due to any cause such as an increase in the frictional force of the movable portion of the circuit breaker or an insufficient energy of the spiral spring, Since the motor power is ON when the roller of the control lever reaches the intermediate position at the beginning of the closing operation, the movable portion of the circuit breaker can reach the completely closed position by the driving force of the motor.

[0023]

Embodiments of the present invention will be specifically described below with reference to the drawings. [First Embodiment] [Configuration] FIG. 1 is an enlarged view showing a main part of an operation mechanism of a circuit breaker according to a first embodiment of the present invention.
Is a front view, and (B) is a side view. As shown in FIG. 1A, in the present embodiment, a striker 9 and a push-up cam 10 used to control the position of the roller 6 of the control lever 5 in the conventional operation mechanism shown in FIG. Instead, a lever guide 21 is provided in a notch of the guide ring 4.

The lever guide 21 is provided on the guide ring 4
And the roller 6 of the control lever 5 is rotated integrally with the energy storage gear 2 and the guide ring 4 by the rotational inertia of the energy storage gear 2 at the end of the closing operation.
From the inner position inside the guide ring 4 to the outer position on the outer periphery of the guide ring 4. That is, the lever guide 21 includes a bottom portion that holds the roller 6 of the control lever 5 at an internal position, a top portion that is located slightly outside the outer peripheral surface of the guide ring 4, and an inclined portion that is inclined from the bottom to the top. It has a guide surface, and is configured so as to push up the roller 6 outward by the guide surface during rotation and move the roller 6 to an external position on the outer periphery of the guide ring 4.

On the other hand, as shown in FIG. 1B, the control lever 5 is rotatably attached to the frame 15 by a pin 17.
The roller 6 is rotatably mounted so as to rotate integrally. Further, the roller 6 is rotatably pressed against the outer circumference of the guide ring 4 by the urging force of a spring (not shown), and one end of a lever 18 is connected to the other end of the control lever 5. To lever 18
The point that the micro switch 8 is mechanically turned ON / OFF at the other end of the lever 18 after being converted to the linear operation described above is exactly the same as the conventional operation mechanism shown in FIG.

In FIG. 1, spiral springs, electric motors, and the like are omitted, but other than the above-described features of the present embodiment, other configurations are the same as those of the conventional operation shown in FIG. Since the mechanism is completely the same, the description is omitted here.

[Operation] FIG. 2 is an explanatory diagram showing the operation of the operating mechanism of the circuit breaker according to the present embodiment as described above.
(A) shows a state in which the roller is being pushed up by the rotational inertia of the energy storage gear at the end of the closing operation, and (B) shows a state in which the roller is pushed up. Hereinafter, the operation of the roller at the time of accumulating the spiral spring and at the end of the closing operation will be sequentially described with reference to FIG. 2 or FIG.

First, when the spiral spring 1 is charged, the roller 6 of the control lever 5 is driven by the outer peripheral surface of the guide ring 4 with the rotation of the guide ring 4 integrated with the charging gear 2. Rotate. Then, as shown in FIG. 1A, when the roller reaches the notch of the guide ring 4, the roller 6
Moves inward from the notch of the guide ring 4 to reach the inner position and is held at the bottom of the lever guide 21.
As a result, the microswitch 8 is turned off, the electric motor 7 and the energy storage gear 2 are stopped, and the energy accumulation of the spiral spring 1 ends (see FIG. 4).

Next, at the end of the closing operation, when the closing cam 11 integrated with the shaft 3 comes off from the main lever 12, the spiral spring 1 and the energy storage gear 2 are pulled by the inertia force of the shaft 3, and are integrated. As a result, the closing cam 11 rotates until it engages with the sea prop 13 (see FIG. 4). With the rotation of the energy storage gear 2, the roller 6 of the control lever 5 held at the inner position inside the notch of the guide ring 4 as shown in FIG. Along the guide surface 21, it is guided from the bottom to the slope and the top. In this case, lever guide 2
Since the top of 1 is located slightly outside the outer peripheral surface of the guide ring 4, the roller 6 moves smoothly from the top onto the outer periphery of the guide ring 4 as shown in FIG. be able to. As a result, the lever 18 shown in FIG.
Moves to the right side in the figure to turn on the microswitch 8, and starts accumulating the spiral spring for the next closing operation.

[Effects] As described above, according to the present embodiment, the roller 6 at the inner position is rotated by rotating the lever guide 21 by the rotational inertia of the energy storage gear 2 at the end of the closing operation. The lever guide 21 can be reliably moved to an external position on the outer periphery of the guide ring 4. That is, only by the integral rotation of the guide ring 4 and the lever guide 21 provided in the notch,
The position of the roller 6 of the control lever 5 can be easily controlled.

Since only the guide ring 4 is combined with the lever guide 21 which rotates integrally with the guide ring 4, the vicinity of the control lever 5 around the control lever 5 can be reduced as compared with the case where the striker 9 and the push-up cam 10 are used as in the prior art. The number of parts can be reduced and the structure is simple. Moreover, the roller 6
Roller 6, such as striker 9, which operates by contacting
There is no member that causes excessive load on the roller, so even if the spiral spring is over-charged or under-charged due to manual charging, no excessive load is applied to the roller. Does not cause any problem.

[Second Embodiment] [Configuration] FIG. 3 is an enlarged front view showing a main part of an operation mechanism of a circuit breaker according to a second embodiment of the present invention. As shown in FIG. 3, the present embodiment is different from the first embodiment shown in FIG.
In the operating mechanism according to the embodiment, a switch cam 22 integrated with the shaft 3 is provided in addition to the lever guide 21 in order to control the position of the roller 6 of the control lever 5. The switch cam 22 is connected to the energy storage gear 2.
During the closing operation before the rotational inertia force acts on the shaft 3, the roller rotates integrally with the shaft 3.
Is pushed up from the inside position inside the guide ring 4 to the outside and moved to an intermediate position inside the outside position on the outer periphery of the guide ring 4.

When the roller 6 of the control lever 5 is moved from the inside position inside the guide ring 4 to the intermediate position by the switch cam 22, the control lever 5 and the lever 18 and the micro switch 8 are turned on. The setting is made such that the energy storage gear 2 is rotated to be ON and the spiral spring is energized. The configuration of the other parts is the same as that of the first embodiment, and the description is omitted here.

[Operation / Effect] According to the present embodiment as described above, before the roller 6 at the inner position inside the guide ring 4 is completely moved to the outer position on the outer periphery of the guide ring 4, The micro switch 8 can be turned ON just at the time when the spiral spring is slightly moved outward to start accumulating the spiral spring. Therefore, even if the circuit breaker performs an incomplete closing operation due to an increase in the frictional force of the movable portion of the circuit breaker or a lack of energy of the spiral spring, the control lever 5 is initially operated at the closing operation. When the roller 6 reaches the intermediate position, the microswitch 8 is turned on, so that the movable portion of the circuit breaker can reliably reach the completely closed position by the driving force of the electric motor.

[Other Embodiments] The present invention is not limited to the above-described embodiments, and the specific configuration of each part can be changed as appropriate. For example, in the above embodiment, the top of the lever guide 21 is located slightly outside the outer peripheral surface of the guide ring 4, but the top of the lever guide 21 is located at a position equivalent to the outer peripheral surface of the guide ring 4. In such a case, the roller 6 can be pushed up to the outer peripheral surface of the guide ring 4.

The lever guide 21 is generally
Although it is conceivable that the guide ring 4 or the energy storage gear 2 is fixedly attached to the guide ring 4, it is sufficient to rotate at least integrally with the guide ring 4. The configuration can be appropriately selected. Further, the specific configuration of the electric motor and electric motor power supply for storing the spiral spring and the specific connection configuration for ON / OFF control from the control lever to the electric motor power supply can be appropriately selected. Further, a specific driving force transmission configuration from the shaft to the main contact of the circuit breaker, an engagement configuration for fixing the shaft in a stationary state, and the like can be appropriately selected.

[0037]

As described above, according to the present invention, the roller position of the control lever is controlled only by the integral rotation of the guide ring and the lever guide provided in the notch. This has a simple structure with a small number of parts around the control lever, and does not cause any trouble even if the spiral spring is over-charged or under-charged due to manual charge, and has excellent reliability. A vessel operating mechanism can be provided.

[Brief description of the drawings]

FIG. 1 is an enlarged view showing a main part of an operation mechanism of a circuit breaker according to a first embodiment of the present invention, (A) is a front view, and (B) is a side view.

FIGS. 2A and 2B are explanatory views showing the operation of the operating mechanism of the circuit breaker shown in FIG. 1, wherein FIG.
(B) is a state where the roller pushing-up operation is completed.

FIG. 3 is an enlarged front view showing a main part of an operation mechanism of a circuit breaker according to a second embodiment of the present invention.

FIG. 4 is an exploded perspective view showing an example of a conventional operation mechanism of a circuit breaker using a spiral spring.

FIG. 5 is an enlarged front view showing a main part of FIG. 4;

6A and 6B are explanatory views showing the operation of the operating mechanism of the circuit breaker shown in FIG. 4, wherein FIG. 6A is a state in which the spiral spring is being charged, FIG. 6B is a state in which the spiral spring has been charged, and FIG. It is in operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spiral spring 2 ... Energy storage gear 3 ... Shaft 4 ... Guide ring 5 ... Control lever 6 ... Roller 7 ... Electric motor 8 ... Micro switch 9 ... Striker 10 ... Push-up cam 11 ... Closing cam 12 ... Main lever 13 ... Sea prop 14 … Closed circuit catch 15, 16… Frame 17… Pin 18… Lever 19… Guide rod 21… Lever guide 22… Switch cam

Claims (2)

[Claims] 1. A shaft fixed to an inner end of a spiral spring serving as a power source for closing operation of a circuit breaker and transmitting a driving force, and a storage fixed to an outer end of the spiral spring to accumulate the spiral spring. A power gear, a guide ring with a notch integrated with the energy storage gear, a control lever for performing ON / OFF control of a motor power for rotating the energy storage gear, and one end of the control lever. A roller that presses against the outer periphery of the guide ring, and when the roller is at an external position on the outer periphery of the guide ring, the control lever turns on the motor power to rotate the energy storage gear. When the roller moves to the internal position inside the external position at the cutout portion of the guide ring, the electric power of the electric motor is turned off by the control lever. In the operation mechanism of the circuit breaker configured to end the accumulation of the spiral spring as F and perform the closing operation by rotating the shaft by the release of the spiral spring during the closing operation, the guide ring is cut off. A lever that is arranged to overlap the notch, and that rotates integrally with the energy storage gear and the guide ring by the rotational inertia of the energy storage gear at the end of the closing operation to guide the roller from the internal position to the external position. A guide is provided, and the lever guide has a bottom portion that holds the roller at the internal position, a top portion that is located outside the outer peripheral surface of the guide ring, which is equal to or more than the outer peripheral surface, and an inclined portion that is inclined from the bottom to the top. When the roller rotates, the roller is pushed up by the guide surface to move the roller to the external position on the outer periphery of the guide ring. Breaker operating mechanism, characterized in that configured. 2. A closing operation before a rotational inertia force of the accumulating gear is applied, the unit rotates together with the shaft, and pushes up a roller of the control lever from the internal position to an outside to move the control lever roller to an intermediate position inside the external position. A switch cam for moving the power spring to the intermediate position and turning on the electric motor to rotate the energy storage gear to store the spiral spring when the roller moves from the internal position to the intermediate position. The operating mechanism of the circuit breaker according to claim 1, wherein the operating mechanism is configured to be biased.