JPS61267221A - Circuit breaker - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hardwired circuit breaker, and more particularly to a tripping mechanism thereof.

[Background of the invention]

In general, the tripping mechanism of a circuit breaker is kept in a locked state by the slight locking force and locking dimensions of the tripping members, so the impact when the movable contact is opened by the handle causes the tripping mechanism to lock. There are cases where the stopped state is removed and the state becomes the same as when tripped, and this type of mistrip is extremely inconvenient, especially in circuit breakers that have built-in accessory devices for trip indication etc. Conventionally, mistrip prevention methods were used. Therefore, as shown in FIGS. 7 and 8, when the movable contact 2 is opened by operating the handle, the pusher 25 that moves together with the operating lever 8 releases the first tripping member 16 of the tripping mechanism. There is a structure in which the core removal member is prevented from rotating in the trip direction (clockwise in FIG. 8) by pressing (see Japanese Utility Model Publication No. 1983-43494).

However, the pressing force by the pusher 25 acts as a force P in the direction of returning the second tripping member 20 of the tripping mechanism to its normal position when resetting the quick-acting quick-on mechanism 1 from the trip state. , before the quick-acting speed-in Ml is reset, the first tripping member 16 and the second tripping member 2
0 locking portion 23 is formed, and as a result, the seven hooks 6 of the quick-acting, quick-in mechanism cannot be locked to the second tripping member 20, resulting in a problem that reset is impossible.

As a countermeasure, the force of the spring 22 applied to the second tripping member 20 may be increased to prevent the second tripping member 20 from returning to its normal position due to the pressing force of the suppressor 25, or the force of the spring 22 applied to the second tripping member 20 may be increased. It is also possible to change the dimensions of
In both cases, the tripping load increases during tripping.
The trip characteristics become unstable, which is not good.

[Purpose of the invention]

An object of the present invention is to provide a circuit breaker that can smoothly and reliably perform a reset operation after tripping while preventing erroneous tripping, and has stable tripping characteristics.

[Summary of the Invention] The present invention provides a first mechanism between the quick-acting speed-on mechanism and the overcurrent response device, which rotates in the trip direction by the operation of the overcurrent response device.
The tripping member is normally locked to the first tripping member, and when the first tripping member is rotated in the trip direction, the handle is rotated in a direction in which it is disengaged from the quick-acting and quick-in mechanism. In the circuit breaker, the circuit breaker is provided with a second tripping member that is re-engaged by a quick-acting, quick-on reset operation. The present invention is also characterized in that an inclined portion is provided which applies a rotational force to the second tripping member in a direction opposite to the direction in which it returns to its normal position.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is a diagram showing the overall structure of an embodiment of a circuit breaker according to the present invention.

Reference numeral 1 denotes a quick-acting, quick-in mechanism, which includes a lower link 3 connected to a movable contact 2 - an upper link 5 connected to this via a pin 4.
- it consists of a hook 6 engaged in this upper link 5, an operating lever 8 connected to the handle 7, and a spring 9 mounted between this operating lever 8 and the bin 40; 10 is a fixed contact.

11 is an overcurrent response device, which includes an electromagnetic coil 12. Yoke 13.
Magnetic pole 14. It is composed of a movable iron piece 15 and the like.

16 is connected to a 6-pole common pulling shaft 17, and the fulcrum shaft 1
8 is a first tripping member that rotates around the fulcrum shaft 21; 22 is a spring that applies a rotational force in the trip direction (clockwise in the figure) to the second tripping member 20; 23 is a spring between the first tripping member 16 and the second tripping member 20; The locking portion 24 is a locking portion formed between the second tripping member 20 and the hook 6 of the quick-action quick-in mechanism, and 16a is a slope portion 20a provided on the first tripping member 16, which will be described later. is the reset engagement part of the second tripping part 0.

The first tripping member 16 and the second tripping member 20 are located between the quick-acting speed-in mechanism 1 and the overcurrent response device 110, and constitute a tripping mechanism.

Reference numeral 25 denotes a suppressor (plate spring) for preventing mistrips, which operates together with the operating lever 8.

2 to 5 are operation explanatory diagrams, in which FIG. 2 shows the on state, FIG. 3 shows the trip state, FIG. 4 shows the state in the middle of resetting, and FIG. 5 shows the off state.

When an overcurrent flows in the on state shown in FIG. and rotate in the trip direction (clockwise in the figure). As a result, the locking portions 23 of the first tripping member 16 and the second tripping member 20 are disengaged, and the second tripping member 20
The spring 22 rotates the clockwise direction, that is, 7 of the quick-action, quick-on mechanism.
It rotates in the direction in which the engagement with the claw 6 is released. When the locking portion 24 of the second tripping member 20 and the seventh hook 6 are disengaged, the upper link 5. The movable contactor 2 is opened and separated via the lower link 3, resulting in the tripped state shown in FIG. At this time, the second tripping member 20
The distal end thereof is the inclined portion 16a of the first tripping member 16.
It rotates at position 1 where it engages with.

If you turn the handle 7 clockwise when resetting, 7
The hook 6 is interlocked with the operating lever 8 through an engaging portion 26. FIG. 4 shows a state in which the suppressor 25 begins to come into contact with the first tripping member 16 during the reset.

If you turn the handle 7 further clockwise,
The pressing force of the pressing member 25 is combined with the force of the spring 19 to act on the first tripping member 16 as a rotational force in a counterclockwise direction, that is, in a counter-trip direction. On the other hand, the hook 6 hits the reset engagement portion 20a of the second tripping member 20 ~ the spring 22
The second tripping member 20 is rotated counterclockwise, ie, in the direction of returning to the normal position. As a result, the inclined portions 1 of the second tripping member 20 and the first tripping member 16
By releasing the engagement with 6a and returning the handle 7,
As shown in FIG. 5, the locking portions 23 of the first tripping member 16 and the second tripping member 20 and the locking portions 24 of the second tripping member 20 and the hook 6 are formed, and the circuit breaker is in the OFF state. becomes.

In the course of this reset operation, the suppressor 25 is deflected, and the load applied to the first tripping member 16 reaches its maximum immediately before the reset is completed.

Naturally, it is also possible to operate the handle 7 from the on state shown in FIG. 2 to the off state shown in FIG. 5, or vice versa.

Next, the direction of the force applied to the second tripping member 20 at the time of resetting will be explained while comparing it with a conventional one.

FIG. 7 is an explanatory diagram of the conventional one. P2 is the force that the second tripping member 20 receives from the engaging portion 16b of the first tripping member 16 due to the resultant force of the pusher 25 and the spring 19 during reset; Since the angle 02 formed with the stop portion 23 is a2''-9o°, the force P2 is a rotational force p2 in the counterclockwise direction, that is, in the direction of returning to the normal position, against the second tripping member 20.
etc.

<1. is the distance from the center of the fulcrum shaft 21 to the line of action 1 of the force P2). This (b) transmission force P2 ・t is the spring 22
8, the second tripping member 2o rotates counterclockwise and enters the state shown in FIG. 8.

In the state shown in FIG. 8, since the locking portions 23 of the first tripping member 16 and the second tripping member 20 are already formed, the seven hooks 6 lock the locking portions 24 of the second tripping member 20. You cannot move beyond it and cannot reset it.

In order to prevent this from becoming impossible to reset, in this embodiment, as shown in FIG. is θ,〈90°
6a, and in the trip state, a second
The distal end of the tripping member 20 is engaged. By doing this, the line of action of the force P that the second tripping member 20 receives due to the resultant force of the pusher 25 and the spring 19 at the time of resetting passes from the branch shaft 21 to the overcurrent response device 11 side, and (b) Transmission force P1・11 (11
is the distance from the center of the branch shaft 21 to the line of action 1 of the force P1. Therefore, as in the conventional examples shown in FIGS. 7 and 8, the locking portions 23 of the first tripping member 16 and the second tripping member 20 are formed during the reset operation, making it impossible to reset. There is no. 1, a spring 2 added to the second tripping member 20 to prevent it from becoming impossible to reset.
Since there is no need to increase the force in step 2, the tripping load does not increase. In this case, since the force P and the rotational force applied to the second tripping member 20 by the barbs 22 are smaller than the handle operating force, the reset operation for locking the hook 6 to the second tripping member 20 is performed smoothly. be able to.

In the above-described embodiment, the pusher 2 moves together with the operating lever 8.
5) is intended to prevent IJ bumps, but the prevention of incorrect tripping is achieved by adding a spring 19 to the first tripping member 16.
This can be done even if the force is increased, so the present invention is effective even when there is no suppressor 25.

〔Effect of the invention〕

According to the present invention, when the force in the anti-trip direction applied to the first tripping member is increased in order to prevent mistrips, the second tripping member is activated by the force received from the first tripping member at the time of reset. It is possible to prevent the reset from becoming impossible by cleaning it to the normal position before re-engaging, and the reset operation can be performed smoothly without increasing the trip load and destabilizing the trip characteristics. , a more reliable circuit breaker can be obtained.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the overall structure of an embodiment of the circuit breaker according to the present invention, Fig. 2 is a partial side view in the on state, Fig. 3 is a partial side view in the trip state, and Fig. 4 is a reset Figure 5 is a partial side view in the middle of operation, Figure 5 is a partial side view in the off state, Figure 6 is a partial side view in the OFF state.
The figure is an explanatory diagram showing the direction of the force applied to the second tripping member of the present embodiment, FIG. 7 is an explanatory diagram showing the direction of the force applied to the second tripping member of the conventional example, and FIG. FIG. 3 is a side view showing a state in which reset is impossible. 1: Quick-action, quick-on mechanism, 7: Handle, 11: Overcurrent response device, 16: First tripping member, 20: Second tripping member, 16a: Inclined portion of first tripping member Figure 1, second eye $3 Figure $4 Figure 5 Figure $6 Figure 7 Figure 8

Claims (1)

[Claims] Between the quick-acting speed-on mechanism and the overcurrent response device, there is provided a first tripping member that rotates in the trip direction upon activation of the overcurrent response device;
A second tripping member is rotated in a direction in which it is disengaged from the quick-acting quick-on mechanism by rotation of the tripping member in the trip direction, and is re-engaged with the quick-acting quick-on mechanism by a reset operation of the handle. In the circuit breaker, the first tripping member is configured to engage with the second tripping member when in the tripped state, and to return the second tripping member to the normal position in a direction opposite to the direction of the tripping member. A circuit breaker characterized by being provided with an inclined portion that applies rotational force.