JPH067551Y2 - Multi-pole circuit breaker - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention has an opening / closing mechanism pole with an opening / closing mechanism and a pole without an opening / closing mechanism. The present invention relates to a multipole circuit breaker in which a movable element is separated by an electromagnetic repulsive force to limit a current.

[Conventional technology]

A conventional multi-pole circuit breaker of this type will be described with reference to FIGS. 3 to 10. 3 is a front view, FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV of FIG. 3, FIG. 5 is an enlarged view of a main part of FIG. 4 showing an ON state, and FIG. 6 is an OFF state of FIG. The same figure as FIG. 5, FIG. 7 shows the trip state, the same figure as FIG. 5, and FIG.
The figure is the same as FIG. 5 showing the repulsive state, FIG. 9 is an enlarged sectional view taken along the line IX-IX in FIG. 3, and FIG.
It is a principal part enlarged view of a figure. In FIG. 3, (1) is a breaker case, which is composed of a base and a cover. (2) is a switchgear pole arranged in the center of the breaker case (1), (3),
(3) is a pole without an opening / closing mechanism arranged on each side of the circuit breaker case (1) across the opening / closing mechanism pole (2), (4) is an operating handle for the opening / closing mechanism pole (2), (5) This is the window provided in the circuit breaker case (1). 4 to 8, (1a) is the base of the breaker case (1), and (1b) is the breaker case (1).
Cover, (6) fixed conductor on the power supply side fixed to the base (1a), (7) fixed contact fixed to the fixed conductor (6), (8) automatic tripping device, (9) automatic pulling device. A fixed conductor on the load side connected to the disconnecting device (8), (10) a movable contact, (11) a mover to which the movable contact (10) is fixed, and (12) a mover (11) to a connecting conductor (13). ) Is a flexible conductor for connecting to the automatic trip device (8), and (14) is a contact arm for holding the mover (11), and a first contact arm ( 14a) and the mover (11) are divided into a second contact arm (14b) rotatably supported by the first pin (15). Reference numeral (16) is a support shaft of the contact arm (14), and the first contact arm (14a) and the second contact arm (14b) are rotatably supported. (17) is the first contact arm (14) of each pole (2), (3)
a crossbar connecting (a), (18) is a guide hole provided in the first contact arm (14a) and extending in the opening / closing direction, and (19) is an elongated hole provided in the second contact arm (14b), It extends in a direction intersecting with the guide hole (18). (20) is a second pin that engages across the guide hole (18) and the long hole (19), and (21) is the first pin (1
5) A pulling spring provided between the second pin (20) and
Energize the second pin (20). (22) is a mover (1
A contact pressure spring provided between 1) and the second contact arm (14b), (23) is a circuit breaker opening / closing mechanism, and includes a cradle (23a), an upper link (23b) and a lower link (2).
3c) and the like. (24) is the cradle (2
3a) is a stopper pin, (25) is a connecting pin for connecting the lower link (23c) to the first contact arm (14a), and (26) is an arc extinguishing chamber. In FIGS. 9 and 10, (27) is a cover stopper provided on the cover (1b).

Next, the operation will be described. In the ON state of the switching mechanism pole (2) shown in FIGS. 3 to 5, the power source side fixed conductor (6) → fixed contact (7) → movable contact (10) → movable element (11) → flexible conductor (12) ) → Connection conductor (13) → Automatic trip device (8)
→ Current flows in the direction of the load side fixed conductor (9). Further, in the ON state of the pole (3) without the opening / closing mechanism shown in FIGS. 3 and 9, the power source side fixed conductor (6) → fixed contact (7) → movable contact (1
0) → mover (11) → flexible conductor (12) → connecting conductor (1
3) → Current flows in the direction of the load side fixed conductor (9). When the operation handle (4) is turned off (in the direction of the arrow (28) in FIG. 5), the contact arm (14) is lifted by the opening / closing mechanism (23) to move the movable contact (10) together with the movable contact (10) to the first position. As shown in Fig. 6, separate from the fixed contact (7). At this time, since the second pin (20) is fitted into the recess of the guide hole (18) by the pulling spring (21), the second contact arm (14b) is integrated with the first contact arm (14a). Then, it is lifted up by using the support shaft (16) as a fulcrum and collides with the stopper pin (24) to stop. This open / close mechanism pole (2) contact arm (1
The movement of 4) is transmitted to the pole (3) having no opening / closing mechanism by the crossbar (17), and the contact arm (14) of the pole (3) having no opening / closing mechanism is separated to move the second arm as shown in FIG. The contact arm (14b) of the cover stopper (27)
And then stop.

When an overcurrent flows in the ON state shown in FIGS. 3 to 5 and 9, the automatic trip device (8) operates and the cradle (23a) rotates (direction of arrow (29) in FIG. 5). Therefore, the contact arm (14) is lifted by the operation of the opening / closing mechanism (23), the movable contact (10) is opened as shown in FIG. 7, and the overload current is cut off. This is a so-called trip state. At this time as well, the second pin (20) is fitted in the concave portion of the guide hole (18) by the pulling spring (21) as in the OFF state of FIG. 6, so that the second contact arm (14b) moves to the first position. It is lifted together with the first contact arm (14a) with the support shaft (16) as a fulcrum, and stops by colliding with the stopper pin (24). Although not shown, the contact arm (14) of the pole (3) having no opening / closing mechanism is also simultaneously opened by the cross bar (17), and the second contact arm (14b) is opened as in the off position shown in FIG. It stops by colliding with the cover stopper (27).

When a large current such as a shortening current flows in the ON state shown in FIGS. 3 to 5 and 9, the fixed conductor is generated by the action of the electromagnetic force generated between the fixed conductor (6) and the mover (11).
The mover (11) repels against (6) and separates as shown in FIG. At this time, the first operation is performed by the opening / closing mechanism (23) that operates following the operation of the automatic trip device (8).
Since the operation of the contact arm (14a) of the second contact arm (14a) is delayed in time, the second contact arm (14b) overcomes the biasing force of the pulling spring (21) and causes the second pin (20) to move into the recess of the guide hole (18). The guide shaft (18) by moving the guide shaft (16) from the support shaft (16) to open it,
The pin (20) stops when it collides with the end of the guide hole (18) (the state shown in FIG. 8). Although not shown, the pole (3) having no opening / closing mechanism also repels and separates similarly, and the second pin (2
It stops when 0) collides with the end of the guide hole (18).
Following this repulsion state, the first contact arm (14a) is tripped and lifted by the automatic tripping device (8), so that the second pin (20) fits into the recess of the guide hole (18) again. The trip state shown in FIG. 7 is set. At this time, since the first contact arm (14a) is also tripped and lifted via the crossbar (17) even in the pole (3) having no opening / closing mechanism, similarly, the second pin (20) is again guided through the guide hole. It will fit into the recess of (18) and will be in a trip state. The repulsive movement is performed by an opening / closing mechanism in which the mover (11) is connected through the contact arm (14).
It is faster than the operation of (23), which enhances the current limiting effect.

[Problems to be solved by the invention]

Since the conventional multi-pole circuit breaker is constructed as described above, when the cover (1b) is removed for inspection and assembly adjustment, the cover stopper (2
7) is eliminated so that the second contact arm (14
b) is open at the off position and the trip position by the amount of the guide hole (18) larger than the normal stop position shown in FIG. 10, and there is a problem that inspection and assembly adjustment cannot be performed by normal opening / closing operation and trip operation. there were.

The present invention has been made in order to solve such a problem, and to obtain a multi-pole circuit breaker capable of performing inspection by removing the cover, inspection by normal opening / closing operation and trip operation even in assembly adjustment, and assembly adjustment. With the goal.

[Means for solving problems]

In the multi-pole circuit breaker according to the present invention, a stopper for stopping the second contact arm at the off position is provided at least on the base side of the pole having no opening / closing mechanism.

[Action]

In this invention, since the stopper of the second contact arm is provided at least on the base side of the pole without the opening / closing mechanism, the second contact arm stops at the normal off position even if the cover is removed.

[Example of device]

An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is the same view as FIG. 10 showing the OFF state of the pole without the opening / closing mechanism, and FIG. 2 is an exploded perspective view of the main part of FIG. Is attached and the description is omitted. In the figure, (30) is a bracket for supporting the contact arm (14), which is fixed to the base (1a) by a screw (31). (3
2) and (32) are holes provided in the bracket (30), which are holes (not shown) of the first contact arm (14a) and holes (33) and (33) of the second contact arm (14b). The support shaft (16) inserted into and is inserted. (34) and (34) are stoppers provided on the bracket (30), which are formed by stamping and engage with the second contact arm (14b) to set the off position of the second contact arm (14b). .

When the stopper (34) is provided on the bracket (30) as described above, the second contact arm (14b) engages with the stopper (34) in the off position regardless of the cover (1b) as shown in FIG. When the cover (1b) is removed, the opening / closing operation and the trip operation are normally performed.

In the above embodiment, the stopper (34) is attached to the bracket (3
Although two pieces are provided on both sides of 0), either one may be provided.

In the above embodiment, the stopper (34) is used as the base (1
Although the bracket (30) fixed to a) is provided, it may be provided directly to the base (1a).

Further, in the above-mentioned embodiment, the pole (3) having no opening / closing mechanism is provided with the stopper (34).
Also, a stopper (34) may be provided.

Of course, it is possible to use the cover (1b) having the cover stopper (27) in FIG.

[Effect of device]

As described above, according to the present invention, the simple structure in which the stopper is provided on the base side has the effect that the inspection and assembly adjustment can be performed by the normal opening / closing operation and the trip operation even in the inspection and assembly adjustment performed by removing the cover. is there.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, which is an enlarged view of a main part showing an off state of a pole without an opening / closing mechanism, FIG. 2 is an exploded perspective view of a main part of FIG. 1, and FIG. 3 is a conventional device. 4 is an enlarged cross-sectional view taken along line IV-IV in FIG. 3, FIG. 5 is an enlarged view of a main part of FIG. 4 showing an ON state, and FIG. 6 is a FIG. 5 showing an OFF state. The same figure as FIG. 7, FIG. 7 is the same figure as FIG. 5 showing the trip state, and FIG. 8 is the same figure as FIG.
The drawing is an enlarged sectional view taken along the line IX-IX in FIG. 3, and FIG. 10 is an enlarged view of a main part of FIG. 9 showing an off state. In the figure, (1) is a breaker case, (1a) is a base, (1b) is a cover, (2) is an opening / closing mechanism pole, (3) is a pole without an opening / closing mechanism, (8) is an automatic tripping device, (11) is a mover, (14) is a contact arm, (14a) is the first
Contact arm, (14b) second contact arm, (15) first pin, (16) spindle, (17) crossbar, (18) guide hole, (19) oblong hole. ,
(20) is a second pin, (21) is a spring, (23) is an opening / closing mechanism, (30) is a bracket, and (34) is a stopper. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Scope of utility model registration request] 1. An open / close mechanism pole with an open / close mechanism and a pole without an open / close mechanism are provided, and the mover is separated by an electromagnetic repulsive force due to a large current flow regardless of the interruption operation by an automatic tripping device to limit the current. And a contact arm for holding the mover at each pole is divided into a first contact arm and a second contact arm rotatably supported by each other, and A guide hole extending in the opening / closing direction, which is provided in the first contact arm that is directly connected to the opening / closing mechanism and directly in the opening / closing mechanism pole or indirectly via a crossbar in the pole without the opening / closing mechanism, and the movable member. An elongated hole provided in the second contact arm whose child is supported by the first pin and extending in a direction intersecting the guide hole, and the elongated hole and the guide hole. And a second pin engaging straddling,
A multi-pole circuit breaker having springs for urging the second pins and having each pole arranged in parallel in a breaker case composed of a base and a cover.
A multi-pole circuit breaker, characterized in that a stopper for stopping the contact arm of (1) is provided at least on the base side of the pole without the opening / closing mechanism. 2. A multipolar circuit breaker according to claim 1, wherein a stopper for engaging the second contact arm is provided on a bracket attached to the base. 3. The multipole circuit breaker according to claim 2, wherein the brackets are provided with supporting shafts for rotatably supporting the first contact arm and the second contact arm, respectively.