JP2003223838A - Electrical control device for circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical control device for a circuit breaker, which can prevent breaking a handle of the circuit breaker by reducing the impact force from a linear actuator of the electric operating device on the operating handle of the circuit breaker, when the circuit breaker is switched on or switched off. <P>SOLUTION: The electrical control device 2 has an electromagnet type linear actuator 7, whose movable member 5 is shifted to ON position or OFF position linking the operating handle 1a of the circuit breaker 1. A stopper 11 which faces the operating handle 1a of the circuit breaker 1 at some idle gap g, corresponding to the ON position or the OFF position of the operating handle 1a of the circuit breaker 1 is disposed as a restraining means for reducing the impact force from the movable member 5 at a stroke end of the linear actuator 7, when the circuit breaker 1 is switched on or switched off. The stopper 11 blocks the impact force on the operating handle 1a at the stroke end, when the circuit breaker 1 is switched on or switched off, in order to prevent breaking the operating handle 1a. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an automatic breaker,
The present invention relates to an electric operation device as an external accessory device applied to a circuit breaker for an earth leakage breaker or the like.

[0002]

2. Description of the Related Art In many cases, the above-mentioned circuit breaker used as a component of low-voltage power distribution equipment is installed in a switchboard or a control panel to build a centralized monitoring system. As an accessory device (option), there is an electric operation device that externally gives an operation command (electrical signal) to turn on / off the circuit breaker.

This electric operating device is attached to the main body of the circuit breaker, and its operating handle (rocker type handle) is switched to ON / OFF and reset positions by a linear actuator. Recently, the size and size of the device have been reduced. Aiming to develop an electric operating device that uses an electromagnet type linear actuator based on the principle of a linear motor instead of the conventional electric type actuator (combining an electric motor with a screw drive mechanism to convert the rotation of the electric motor into a linear motion) ， It has been commercialized.

Next, a conventional configuration of an electric operating device using an electromagnet type linear actuator as an operation drive source is shown in FIG.
Shown in (a) and (b). In the figure, 1 is a circuit breaker (auto breaker), 2 is an electric operating device mounted on the main body of the circuit breaker as an external accessory device, and the electric operating device 2 is
A mover (movable core with permanent magnets) 5 linearly guided and supported by a guide rail 4 inside the frame (case) 3, and stators arranged on both sides of the moving path sandwiching the mover 5 ( The electromagnetic linear actuator 7 composed of an electromagnet 6 is built in, the mover 5 has permanent magnets at both ends of the core (yoke), and the stator 6 has an exciting coil 6a at the center leg of the E-shaped core. It becomes the structure which wound. In addition, 8 is a knob (handle) for manual operation attached to the mover 5, 9 is an auxiliary opening / closing lid provided on the upper surface of the cover of the case 3 corresponding to the knob 8, and 10 is a print on which a control circuit of the actuator 7 is mounted. It is a plate, and is connected to an operation power supply and an external signal line through a terminal (not shown).

The operating principle of the electric operating device 2 having the above-described structure is described in detail in Japanese Patent Application No. 2000-273107 previously proposed by the same applicant as the present invention. With the circuit breaker 1 mounted, the mover 5 of the linear actuator 7 is fitted to the tip of the rocker type handle 1a protruding from the breaker body. Then, when the mover 5 of the linear actuator 7 is driven from one stroke end to the other stroke end along the guide rail 4 by an operation command from the outside, the mover 5 is operated by the magnetic thrust to operate the operation handle 1a of the breaker. Press to turn on and off
And switch to the reset position.

In the stop control of the linear actuator 7 in this case, the operation power source is turned off based on a signal from a micro switch for detecting the position of the mover arranged at the stroke end of the mover 5 to electromagnetically drive the mover 5. I'm trying to stop.

[0007]

By the way, the above-mentioned electric operating device having the conventional structure has the following problems in terms of operation. That is, the electric operation device 2 which is attached to the circuit breaker body as an external accessory device of the circuit breaker 1 and is used.
It is difficult in practice to completely match the movement stroke of the mover 5 of the linear actuator 7 with the stop position of the operation handle 1a corresponding to ON / OFF (reset) of the circuit breaker 1. In use, there is some deviation between the two. Moreover, the moving speed of the mover 5 of the electromagnet type linear actuator 7 is remarkably faster than that of the conventional electric drive mechanism, and even if the operation power is cut off at the end of its stroke, the mover immediately stops due to inertial force. Try to overrun without.

On the other hand, the operation handle 1a of the circuit breaker 1 is linked to a toggle type opening / closing mechanism incorporated in the inside of the circuit breaker, and the toggle type opening / closing mechanism is reversed during ON / OFF operation. When operated, the operation handle 1a receives the opening / closing spring force and moves to the ON / OFF position,
It stops at that position and is held in restraint. Further, when resetting the circuit breaker after the trip operation, it is necessary to push the operation handle 1a from the ON position to the reset position (almost the same position as the OFF position) while applying a large operation force, unlike when the OFF operation is performed. is there.

To this end, the magnetic thrust of the linear actuator 7 turns on and off the operation handle 1a of the circuit breaker 1.
When the switching operation to the FF and the reset position is performed, the impact load is applied from the mover 5 to the operation handle 1a at the stroke end of the linear actuator 7, and if the impact load is excessive, the operation handle 1a made of a resin molded product is applied. May not be able to withstand the pressure load and may break.

Moreover, the linear actuator 7 described above is used.
Is designed such that the magnetic thrust of the mover 5 is larger on the OFF operation side than on the operation in accordance with the reset operation of the circuit breaker, and is operated from the mover 5 at the end of the stroke during the OFF and reset operations. Handle 1
The impact load applied to a becomes large. The present invention has been made in view of the above points, and its purpose is to provide an O circuit breaker.
It is an object of the present invention to provide an electric operating device for a circuit breaker, which is provided with a protective measure for mitigating an impact load applied to an operating handle of a circuit breaker from a linear actuator of the electric operating device at the time of N, OFF operation to prevent the handle from being broken. .

[0011]

In order to achieve the above object, according to the present invention, there is provided an electric operating device applied to a circuit breaker having a rocker type operating handle, and an electromagnet type as an operation drive source thereof. In the case where the linear actuator is equipped and the mover of the linear actuator is connected to the operation handle of the circuit breaker to switch between the ON and OFF positions, the circuit breaker is turned on and off.
At the stroke end of the linear actuator, a stopping means is provided for alleviating an impact load applied to the operation handle from the mover at the stroke end of the linear actuator (Claim 1), and the stopping means is specifically configured in the following manner. And

(1) As a stopping means, a stopper member facing the ON / OFF position of the operating handle with a slight play gap is provided inside the electric operating device so as to prevent the ON / OFF operation. When a large impact load is applied to the operation handle at the stroke end of the linear actuator, the stopper member receives the operation handle that bends due to the impact load and prevents the handle from being broken (claim 2).

(2) As a stopping means, a movable connecting piece which is connected to the operating handle in combination with a buffer spring is provided on the mover of the linear actuator, and the operating handle is operated at the stroke end of the linear actuator when the circuit breaker is turned on and off. If a large impact load is applied to the handlebar, the shock absorber spring absorbs the impact load to prevent the handle from being damaged (claim 3).

As a result, the circuit breaker is turned on and off.
Also, at the time of reset operation, the impact load applied to the operation handle of the circuit breaker from the mover of the linear actuator of the electric operation device is mitigated, and the operation handle can be safely protected from breakage.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 and 3. In the drawings of the respective embodiments, members corresponding to those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted. [Embodiment 1] FIGS. 1 (a) to 1 (c) show an embodiment corresponding to claim 2 of the present invention. In this example,
The electric operation device 2 is basically the same as the conventional structure of FIG. 4, but a stop for preventing an excessive impact load from being applied from the mover 5 to the operation handle 1a of the circuit breaker 1 at the movement stroke end of the linear actuator 7. As a means, a stopper 11 facing the operation handle 1a of the circuit breaker 1 is additionally provided on the bottom side of the case of the electric operating device 2.

The stopper 11 is formed at the opening edge of a square hole opened in the bottom plate (resin plate) installed in the case 3, and is described below relative to the operation handle 1a of the circuit breaker 1. Is set. That is, with the electric operating device 2 mounted on the circuit breaker 1, the operating handle 1a which penetrates the square hole of the bottom plate and projects inward of the case.
With respect to the ON / OFF stop position of the operating handle 1a, the end surface of the stopper 11 is separated by a slight play gap g.
To face the side of. The play gap g is set in a range such that the amount of bending of the operating handle 1a does not exceed the breaking limit.

The stopper 11 functions as follows. That is, as shown in the figure, the electric operating device 2 is mounted on the circuit breaker 1, and an operation command is given to the linear actuator 7 to turn on / off the operation handle 1a of the circuit breaker.
ON / OFF (and reset) at the stroke end of the linear actuator 7 when driven toward the position
When an impact load that further pushes the operation handle 1a stopped at the position is applied, the pressing load causes the operation handle 1a to bend laterally while the operation handle 1a is constrained at the stop position. Before the breaking limit is exceeded, the stopper 11 is prevented from hitting and bending further. As a result, the operating handle 1a can be safely protected from a breakage accident.

[Embodiment 2] FIGS. 2 (a), 2 (b) and 3 (a),
(b) shows an embodiment corresponding to claim 3 of the present invention. In this embodiment, the linear actuator 7 is used as a stopping means for protecting the operating handle 1a from breakage.
A movable connecting piece 14 combined with the buffer spring 13 is provided on the lower surface side of the movable element 5, and the movable element 5 and the operation handle 1 a are connected via the movable connecting piece 14.

That is, the movable connecting piece 14 is a square ring made of steel plate as shown in FIG. 2 (b), and is fitted into the guide groove formed on the lower surface side of the mover 5, and then the bottom surface of the mover 5 is inserted. The rib-shaped guide piece 15 on the fixed side that projects downward from is loosely fitted and held so as to be movable left and right. The buffer spring 13 is a compression spring, and is interposed between the guide piece 15 and the right end surface of the movable connecting piece 14. 16
Is a supporting piece for preventing the falling of the buffer spring 13 which is supported at the insertion position. Then, in the state where the electric operating device 2 is mounted on the circuit breaker 1 as shown in the figure, the tip of the operation handle 1a protruding from the circuit breaker 1 is fitted into the movable connecting piece 14 and is in contact with the mover 5. Are connected.

With the above-mentioned structure, when an ON operation command is given to the electric operation device 1 to drive the operation handle 1a from the OFF position toward the ON side, the fixed guide 15 pushes the operation handle 1a, and during the operation thereof. When the toggle type opening / closing mechanism of the circuit breaker 1 is reversed, the operation handle 1a receives the opening / closing spring force and switches to the ON position. When the operation handle 1a hits the left end face of the movable connecting piece 14 by this reversing operation, the buffer spring 13 bends as shown in FIG. 2 (b) to absorb and reduce the impact load applied to the operation handle 1a.

On the other hand, when switching the circuit breaker 1 to the OFF and reset positions, a movable connecting piece that moves together with the mover 5 of the linear actuator 7 as shown in FIGS. 3 (a) and 3 (b). 14 pushes the operating handle 1a in the OFF direction, and when the mover 5 overruns the operating handle 1a that has reached the OFF (and reset) position at the end of its stroke, it is connected to the operating handle 1a. While the movable connecting piece 14 is stopped at this position, the buffer spring 13 bends in the compression direction and the operating handle 1a
Absorbs and alleviates excessive pressure load applied to. This can prevent breakage of the operation handle 1a.

[0022]

As described above, according to the present invention, an electromagnet type linear actuator is provided as an operation drive source, and the mover of the linear actuator is connected to the operation handle of the circuit breaker to turn it on and off. In the electric operating device of the circuit breaker, which is designed to be switched to the position,
When ON / OFF operation of the circuit breaker is performed, a stop means for reducing the impact load applied to the operation handle from the mover at the stroke end of the linear actuator is provided. As the stop means, (1) the electric operation device is internally provided. , Operation handle ON, OF
A stopper member facing the F position with a slight play gap is provided to correspond to the F position, and when a large impact load is applied to the operation handle at the stroke end of the linear actuator during ON / OFF operation, the operation handle is Make sure to use a stopper member.

(2) The mover of the linear actuator is provided with a movable connecting piece that is connected to the operation handle in combination with a buffer spring, and a large impact load is applied to the operation handle at the stroke end of the linear actuator when the circuit breaker is turned on and off. When is applied, the shock load is absorbed and relaxed by the buffer spring. This turns on and off the circuit breaker.
During the FF operation, it is possible to prevent the breakage accident of the handle caused by the impact load applied to the operating handle of the circuit breaker from the linear actuator of the electric operating device, and improve the reliability of the operating surface.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric operating device according to a first embodiment of the present invention, in which (a), (b), and (c) are front views showing an internal structure in a state where they are mounted on a circuit breaker, respectively. , Side view, and plan view

2A and 2B are configuration diagrams of an electric operating device according to a second embodiment of the present invention, in which FIG. 2A is a side view of the entire device showing an ON operation state, and FIG. Figure

3A and 3B are diagrams showing an OFF operation state of the embodiment of FIG. 2, wherein FIGS. 3A and 3B are a side view of the entire apparatus and a bottom view of a main structure, respectively.

FIG. 4 is a conventional configuration diagram of an electric operating device equipped with an electromagnet type linear actuator, in which (a) and (b) are a side view and a front view showing an internal structure in a state in which they are attached to a circuit breaker, respectively. (c) is a plan view

[Explanation of symbols]

1 circuit breaker 1a Operation handle 2 Electric operation device 5 Linear actuator mover 6 stator 7 Linear actuator 11 stopper 13 Buffer spring 14 Movable connection piece

Continued front page    (72) Inventor Katsumi Watanabe             1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa             Fuji Electric Co., Ltd. F term (reference) 5G030 AB02 XX00 YY16

Claims (3)

[Claims] 1. An electric operating device applied to a circuit breaker equipped with a rocker type operating handle, which is equipped with an electromagnet type linear actuator as an operation drive source, and a mover of the linear actuator is used to operate the circuit breaker. A stop means for reducing the impact load applied to the operation handle from the mover at the stroke end of the linear actuator when the circuit breaker is turned on and off when the circuit breaker is turned on and off. An electric operating device for a circuit breaker, which is provided with: 2. The electric operating device according to claim 1, wherein the stopper as a stopping means faces the electric operating device through a slight play gap corresponding to ON and OFF positions of the operating handle. An electric operating device for a circuit breaker, which is provided with a member. 3. The circuit breaker according to claim 1, wherein the movable element of the linear actuator is provided with a movable connecting piece which is combined with a buffer spring and is connected to the operating handle, as the stopping means. Electric operating device.