JPS6144374B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanical block for a circuit breaker, and its purpose is to make the mechanical block easy to assemble, easily adapt to multipolarization, and to reduce latch load. The purpose of the present invention is to provide a breaker mechanism block that also contributes to the stabilization of the breaker.

Figures 1 and 2 show the mechanical block of a conventional breaker. In the figure, reference numeral 10 denotes a bimetal which is an overcurrent sensor, and a part of the tripping link 6 faces the free end of this bimetal 10 with a small distance therebetween. This trip link 6, which is rotatably attached to the frame 11 by a shaft 12, is urged in a direction approaching the bimetal 10 by a return spring 13, and a locking protrusion 14 protruding upward is biased by a return spring 13. It engages with the edge of the engagement hole 15 of the latch link 5. This latch link 5, which is rotatably attached to the frame 11 by a shaft 16, has a vertically elongated hole 17 substantially directly below the pivot point. The link 2, which has a movable shaft 19 at one end that engages with the vertically long hole 17 and the horizontally long hole 18 of the frame 11, is connected to one end of each of the other two links 3 and 4 by a movable shaft 20 at the other end. ,
These three links 2, 3, and 4 constitute a toggle mechanism. The other end of the link 3 is connected to the approximate center of the movable contact 7 by a movable shaft 21, and the other end of the link 4 is movable to the operating handle 1 rotatably attached to the frame 11 by a shaft 23. They are connected by a shaft 22. The movable contact 7 has a movable contact 25 at its lower end and is connected to the link 3 at its center, and has a long groove 27 at its upper end that engages with a shaft 24 fixed to the frame 11. The portion between the long grooves 27 is biased by a contact pressure spring 9 which also serves as an opening spring. 8 is a return spring for the operating handle 1, which is formed of a torsion coil spring;
It is attached to a shaft 23 that pivotally supports the operating handle 1, and has one end locked to the frame 11 and the other end to the operating handle 1. Figures 1 and 3a show this when it is in the on state, with the trip link 6
and the latch link 5 are engaged, and the movable contact 7 is moved in the direction of the fixed contact 26 by the link 3, and the contact pressure spring 9 whose fulcrum is the contact point between the movable contact 25 and the fixed contact 26 The contact pressure is ensured by the biasing force, and the shaft 24 reaches the opening side of the long groove 27 due to the movement of the movable contactor 7 under pressure by the toggle mechanism section, thereby ensuring overtravel. The OFF state is shown in FIG. 3b, and the tripping link 6 returns due to bending of the bimetal 10 due to an overcurrent or attraction of the plunger 30 due to a short circuit current of a short circuit sensor consisting of a plunger 30 and a coil 31 surrounding it. FIG. 3c shows a state in which the toggle mechanism rotates against the spring 13 and disengages from the latch ring 5, causing the toggle mechanism to become unbalanced and tripped. In the mechanism block configured as described above, since the return spring 8 of the operating handle 1 is attached to the operating handle 1 as described above, the operating handle 1 and the return spring are separated between the frame 11 during assembly. 8 and the shaft 23 must be placed at the same time, and installation is not easy. This is especially true when the operating handles 1 of a plurality of mechanical blocks arranged in parallel in a multipolar configuration are interlocked.

The present invention has been made in view of these points, and will be described in detail based on the illustrated example shown in FIG. It consists of a coil 3, a plunger 30, a trip link 6, a latch link 5, three links 2, 3, and 4 forming a toggle mechanism, a movable contact 7, a contact pressure spring 9, and an operating handle 1, and the load current is Fixed terminal 35, fixed contact 26, movable contact 25, braided copper wire 3
6, the bimetal 10, the coil 31, and the load terminal 37. Reference numeral 38 is a tripping interlocking plate, and when the latch link 5 of any one of the plurality of sets of mechanism blocks arranged in parallel rotates at the time of tripping, the latch link 5 is kicked and the other mechanism blocks are pulled. The removal link 6 is rotated against the return spring 13. 39 is an arc extinguishing block. In this device, the return spring 8 of the operating handle 1 is made of a torsion coil spring.
are the three links 2 that make up the toggle mechanism,
A coil portion is attached to a movable shaft 20 connecting one end of each of the coils 3 and 4, and one end is locked to the link 4 connected to the operating handle 1, and the other end is locked to the link 2 connected to the latch link 5. Both links 2,
4 in the direction of the arrow in FIG. 4, and the operating handle 1 is urged to the off side via the link 4. By attaching the return spring 8 to the toggle mechanism section in this way, the return spring 8 can be assembled as a part of the block of the toggle mechanism section before assembly to the frame 11, and therefore, the return spring 8 can be assembled to the frame 11. Attachment is not only easy because it can be done as a block consisting of the toggle mechanism plus the operating handle 1, movable contact 7, and latch link 5.
Since the operation handle 1 can be easily attached and detached, there is also the advantage that a multipolar configuration can be easily achieved. Furthermore, when both ends of the return spring 8 are locked to both links 2 and 4, the distance Y between the axes between the movable shaft 19 that connects the latch link 5 and the link 2 and the shaft 16 that attaches the latch link 5 to the frame 11 is reduced. , the spring bias of the return spring 8 is directly applied to the link 2, so that it is stable, and as a result, the distance between the shafts 16 and the engagement point of the latch link 5 and the trip link 6 is X, and the distance between the shafts Y is The reduction ratio of the load divided by is stabilized, that is, the latch drag fluctuation is reduced. still,
The operation of this device is shown in FIG. 6, and the ON, OFF, and trip operations are performed in the same manner as in the conventional example. In the figure, 40 is a return spring for the plunger 30, and 41 is a head that is provided at one end of the plunger 30 and forcibly pulls out the movable contactor 7 in the event of a short circuit.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional example, Fig. 2 is an exploded perspective view, Fig. 3 a, b, and c are block diagrams at on, off, and trip times, and Fig. 4 is an embodiment of the present invention. sectional view, Figure 5 is an exploded perspective view, Figure 6 a, b,
c is a block diagram during on, off, and tripping. 1 is an operating handle, 2, 3, and 4 are links, 5 is a latch link, 6 is a trip link, 7 is a movable contact, 8 is a return spring, and 9 is a contact pressure spring.

Claims (1)

[Claims] 1 A trip link that rotates against a return spring in response to the operation of an overcurrent sensor or a short-circuit sensor, and an engaging portion with the trip link that is activated by the rotation of the trip link against the return spring. A rotatable latch link that can be disengaged from the release link, and one end of each of the three links are rotatably connected to the same axis, and the other end of the first link is pivotally connected to the latch link. , a toggle mechanism part in which the other end of the second link is pivotally attached to the movable contact and the other end of the third link is pivotally attached to the rotating part integrated with the operating handle; and the movable contact of the movable contact. The mechanism block consists of a contact pressure spring that biases in the direction of contact with the fixed contact, and a return spring that biases the operating handle in the OFF direction is glued to the shaft connecting one end of each of the three links mentioned above. 1. A mechanism block for a breaker, characterized in that it is formed of a torsion coil spring having one end locked to a first link and the other end locked to a third link.