JPH0731481Y2 - Multi-pole circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a multipole circuit breaker and a circuit breaker, and more particularly to support of a trip bar.

[Conventional technology]

As a conventional multi-pole circuit and disconnector of this type, Figs.
The one shown in the figure has been proposed. 4 is a front view, 5
4 is a sectional view taken along line VV in FIG. 4, FIG. 6 is the same view as FIG. 5 showing an off state, FIG. 7 is the same view as FIG. 5 showing a trip state, and FIG. 8 is a trip relay mechanism. Fig. 9 is a perspective view (excluding the trip bar body), Fig. 9 is an ON / OFF state diagram of the trip relay mechanism (excluding the trip bar body), and Fig. 10 is the same diagram as Fig. 9 showing the trip instant,
FIG. 11 is a perspective view of the razor, FIG. 12 is a perspective view of the latch lever, FIG. 13 is an exploded perspective view of the trip bar, and FIG.
Enlarged sectional view of the line XIV-XIV in the figure, FIG. 15 is the line XV-XV in FIG.
FIG. 16 is a sectional view of FIG. 15 and is the same as FIG. 15 showing the trip state. In the figure, (1) is a case or breaker case consisting of a base (1a) and a cover (1b), and a mechanical pole (1A) with an opening / closing operation mechanism and an adjacent pole (1B) without an opening / closing operation mechanism,
(1B) and. (2) is a fixed conductor on the power source side fixed to the base (1a), (3) is a fixed contact fixed to the fixed conductor (2), and (4) is an automatic tripping device, which is not shown, for example, a thermoelectric magnetic type Alternatively, an electronic mechanism is arranged. (5) is a fixed conductor on the load side connected to the automatic trip device (4), (6) is a movable contact, (7) is a movable contactor to which the movable contact (6) is fixed, and (8) is a movable contactor. A flexible conductor for connecting (7) to the automatic trip device (4) via the connection conductor (9), and (10) a contact arm for holding the movable contactor (7), which is an opening / closing operation mechanism described later. Is divided into a first contact arm (10a) and a second contact arm (10b) rotatably supported by a first pin (11). Reference numeral (12) is a support shaft of the contact arm (10), and the first contact arm (10a) and the second contact arm (10b) are rotatably supported respectively. (13) is a crossbar connecting the first contact arms (10a) of the respective poles, (14) is a guide hole provided in the first contact arms (10a) and extending in the opening / closing direction,
5) is an elongated hole provided in the second contact arm (10b),
It extends in a direction intersecting with the guide hole (14). (16) is a second engaging member that straddles the guide hole (14) and the long hole (15).
Pins, (17) is the first pin (11) and the second pin (16)
The second pin (16) is biased by a pulling spring provided between and. (18) is a contact pressure spring provided between the movable contactor (7) and the second contact arm (10b), (19) is an operation handle of a chopstick or a breaker, and (20) is a chopstick of a chopstick or a breaker. With the opening and closing operation mechanism,
Cradle (20a) and upper link (20b) and lower link (20
c) and so on. (21) is the cradle (20a)
Stopper pin provided on (22) is lower link (20c)
A connecting pin for connecting the to the first contact arm (10a), (23) is a mechanism frame fixed to the base (1a), and has both side plates (23a), (23a). (24) is a support shaft erected on both side plates (23a) and (23a), (25) is a flat blade for positioning the cradle (20a), and has a locking portion (25a) that engages with the cradle (20a). ) And a support shaft (24) are fitted into concave portions (25b) and (25b), and a roller engaging portion (25c) formed at the tip of one arm. (26) is the roller engaging portion (25c) of the scraper (25) and the roller (27)
Is a U-shaped latch lever that engages with the clasp (25) to prevent the blade (25) from being rotated by the cradle (20a).
Contact side plate part (26b) that contacts the stopper described later.
And a long hole (26c) provided in the engaging side plate part (26a) and supporting one side shaft (27a) of the roller (27) and the contact side plate part (26).
It has a roller insertion groove (26d) provided in b) and supporting the other side shaft (27b) of the roller (27) and a spring hooking piece (26e). (28) is a pin that rotatably attaches the base end side of the latch lever (26) to the side plate (23a), (29) is a spindle installed on both side plates (23a), (23a), and (30) is a latch lever (26 ) Is a trip bar that prevents rotation by the rake (25). ), (30b), a spring hooking piece (30c), and a rod contact portion (30d) with which a tripod described later comes into contact, and a screw (30A) on the latch portion (30A).
It consists of a trip bar body (30C) attached by B) and extending to each pole. Reference numeral (31) is a double torsion spring, which is inserted into the support shaft (24) by the ring portion (31a) and is also attached by the spring folding portion (31b) to the blade (2).
5) is urged counterclockwise to engage the cradle (20a),
One end (31c) of the spring urges the latch lever (26) counterclockwise so that the latch lever (26) engages with the rake (25), and the other end (31d) of the spring moves the trip bar (30) to the latch lever (2).
It is urged counterclockwise to engage 6). (32) is a stopper provided to project from the side plate (23a), and regulates the non-engaging position of the larch lever (26) where the roller (27) does not engage with the rake (25). (33) is an automatic trip device (4)
With the tripod of, the trip bar (30) operates during tripping and rotates the trip bar (30) against the double torsion spring (31).

(34) A trip button provided on the side of the adjacent pole (1B) of the ladder or breaker case (1) is stored in the storage recess (35) and is pressed to the non-operating position by the pressing spring (36). (3
7) is a trip button contact portion formed on the trip bar (30).

Next, the operation will be described. Figure 4, Figure 5, Figure 8,
In the ON state shown in FIG. 9, the power source side fixed conductor (2) → fixed contact (3) → movable contact (6) → movable contactor (7) → flexible conductor (8) → connection conductor (9) → automatic pulling A current flows in the direction of the disconnecting device (4) → the load side fixed conductor (5).
When the operation handle (19) is turned off (in the direction of the arrow (38) in FIG. 5), the contact arm (10) is lifted by the opening / closing operation mechanism (20) and the movable contact (7) and the movable contact (6). Is separated from the fixed contact (3) as shown in FIG. At this time, since the second pin (16) is fitted in the recess (14a) of the guide hole (14) by the pulling spring (17), the second contact arm (10b) becomes the first contact arm (10a). ) And open / close operation mechanism (20)
It is lifted by and collides with the support shaft (12) and the stopper pin (21) as a fulcrum and stops. In the ON state of FIG. 5 and the OFF state of FIG. 6, the tripod (33) does not operate as shown in FIGS.
5), the latch lever (26), and the trip bar (30) are urged by the double torsion spring (31) to maintain the state shown in FIGS. 8 and 9, and the cradle (20a) is replaced by the scraping blade (2).
Retained by 5).

Next, when an overcurrent flows in the ON state shown in FIGS. 4, 5, 8, and 9, the automatic trip device (4)
Is activated and the tripod (33) operates as shown in FIG. In the instant trip condition of FIG. 10, when the trip bar (30) is rotated clockwise against the double torsion spring (31) and the locking piece (30a) is disengaged from the latch lever (26), the latch lever (26) is released. The (26) can be rotated clockwise, and the cradle (20a) flip-up force (3
9) Use the double torch spring (3)
It is rotated clockwise against 1), and at this time, the latch lever (26) is also rotated clockwise against the double torsion spring (31) by the blade (25) to instantly move to the first position. The state shown in Fig. 10 is obtained. When the tripod (33) returns to its original position, the blade (25), the latch lever (26) and the trip bar (30) are restored to the state shown in FIG. 9 by the double torsion spring (31). Then, the reset operation causes the cradle (20a) to engage the punch (25) with the "punch". Then, as shown in FIG. 10, the cradle (20
When a) flips up, the opening / closing operation mechanism (20) operates, so that the contact arm (10) is lifted to open the movable contact (8) as shown in FIG. 7, thereby cutting off or disconnecting the overload current. . This is the so-called trip state. Also at this time
Since the second pin (16) is fitted in the recess (14a) of the guide hole (14) by the pulling spring (17) as in the off state in the figure, the second contact arm (10b) is It is lifted by the opening / closing operation mechanism (20) integrally with the contact arm (10a), and stops by colliding with the stopper pin (21) with the support shaft (12) as a fulcrum.

When the trip is to be manually performed, the trip button (34) may be pushed against the pressing spring (36). When the trip button (34) is pushed in the direction of the arrow (40) in FIG. 15, the trip bar (30) is rotated in the direction of the arrow (41) in FIG. 16 so that each pole trips at the same time.

[Problems to be solved by the invention]

In the conventional multi-pole circuit or breaker as described above, since the end of the trip bar (30) pushed by the trip button (34) is not supported as shown in FIG. 14, the trip operation by the trip button (34) is performed. Deflection of the trip bar (30) increases with time, and the trip bar (30)
It was necessary to increase the strength of. Therefore, there is a problem that the trip bar (30) cannot be reduced in size and weight, which in turn makes it impossible to reduce the size and weight of a multi-pole circuit and a disconnector.

The present invention has been made to solve such a problem, and it is an object of the present invention to reduce the deflection of the trip bar by the trip button to make the trip bar compact and lightweight, and to obtain a compact and lightweight multi-pole circuit and disconnector. .

[Means for solving problems]

In the multi-pole circuit breaker according to the present invention, the end of the trip bar on the side where the trip button abuts is supported by a supporting member in a breaker case.

[Action]

In this invention, since the end portion of the trip bar is supported, the deflection of the trip bar is reduced during trip operation by the trip button.

[Example of device]

An embodiment of the present invention will be described below with reference to FIGS. 1 is a front view, FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG. Are denoted by the same reference numerals and description thereof will be omitted. In the figure, (42) is a recess provided in the step (101) of the chopstick casing (1), and (43) is a support member fitted and fixed in the recess (42), which is the end of the trip bar (30). It has a hole (43a) for supporting the portion (301). The hole (43a) is slightly larger than the outer diameter of the trip bar end (301). Therefore, since the trip bar (30) normally rotates in a free state without being affected by the support member (43), even if the trip bar body (30C) is distorted due to molding, the trip bar (30) and the hole (43a) are not in contact with each other. There is no friction.

In this way, when the end portion (301) of the trip bar (30) is supported by the support member (43), the trip button (34)
Deflection of the trip bar (30) is reduced during trip operation due to.

In addition, in a large size or a circuit breaker, since the trip bar becomes long, a greater effect can be obtained.

[Effect of device]

As described above, according to the present invention, since the deflection of the trip bar due to the trip button can be reduced, the trip bar can be made compact and lightweight, and thus the multi-pole circuit and the disconnector can be made compact and lightweight.

[Brief description of drawings]

1 is a front view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a line III-I in FIG.
II is a sectional view, FIG. 4 is a front view showing a conventional one, FIG. 5 is a sectional view taken along line VV in FIG. 4, FIG. 6 is the same view as FIG. 5 showing an off state, FIG. The figure is the same as FIG. 5 showing the trip state, FIG. 8 is a perspective view of the trip relay mechanism, FIG. 9 is the on / off state diagram of the trip relay mechanism, and FIG. 10 is the same figure as FIG. 9 showing the instant of the trip. , Fig. 11 is a perspective view of the bat, Fig. 12 is a perspective view of the latch lever, Fig. 13 is an exploded perspective view of the trip bar, Fig. 14 is an enlarged sectional view of line XIV-XIV in Fig. 4, and Fig. 15 is FIG. 16 is a sectional view taken along line XV-XV in FIG.
The figure is the same as FIG. 15 showing the trip state. In the figure, (1) chopstick and breaker case, (1A) mechanical pole, (1B) adjacent pole, (4) automatic trip device,
(20) is an opening / closing operation mechanism, (23) is a mechanism frame, (30)
Is a trip bar, (301) is an end portion, (34) is a trip button, (42) is a recess, (43) is a support member, and (43a) is a hole. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Scope of utility model registration request] 1. A breaker case having multiple poles, a mechanism frame installed on a mechanism pole having an opening / closing operation mechanism of the breaker case, a support frame supported by the mechanism frame, and an end portion of the case. And a trip bar extending to an adjacent pole without an opening / closing mechanism of the breaker case, an automatic tripping device for tripping the trip bar, and a trip bar provided on the adjacent pole side of the breaker case to trip the trip bar from the outside of the case. In a multi-pole circuit breaker having a trip button, the end portion of the trip bar on the side where the trip button abuts is supported by a supporting member on the breaker case. . 2. A hole for inserting and supporting the end portion of the trip bar is provided in the support member, and a recess for fitting and fixing the support member is provided in the breaker case. The multi-pole circuit breaker and breaker according to claim 1 of the utility model registration claim. 3. A utility model registration claim according to claim 2, wherein the hole of the support member is made slightly larger than the outer diameter of the end of the trip bar so that a gap can be formed on the non-support side of the end. Multi-pole circuit breaker as described in paragraph.