JPH03246849A - Circuit breaker - Google Patents

Abstract

PURPOSE:To improve productivity and facilitate inventory management by rotatably supporting a handle on a support section integrally formed with a case body, and rotatably fitting a moving contact plate between a shaft support section and a fitting hole with a pivotal pin. CONSTITUTION:A handle 33 is rotatably supported on a support section 26c integrally formed with a case body 26, a moving contact plate 36 with a moving contact 35 is provided between a shaft support section 26e integrally formed with the case body 26 and a fitting hole 22b, and it is rotatably fitted by a pivotal pin 40 inserted into them. A yoke 22 has a simple shape that only the fitting section of an armature 23 on one end section and a support piece 22c on the other end side are provided, it can be simply manufactured, it is divided into an overcurrent detecting mechanism section and a trip mechanism block constituted of the handle 33, a trip mechanism section and the moving contact plate 36, they can be individually assembled and controlled, and inventory management is made simple.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a circuit breaker for detecting overcurrent and opening a main circuit.

<Prior Art> This type of conventional general circuit breaker has a configuration as shown in FIGS. 4 and 5, which show vertical cross sections in the on state and off state, respectively. . That is, inside the case body 1, an overcurrent detection mechanism section A, a tripping mechanism section B that opens a main circuit consisting of a movable contact 2 and a fixed contact 3 in response to the overcurrent detection operation of the overcurrent detection mechanism section A, A handle 4 for manually opening and closing the main circuit is incorporated in an integrally connected state, and the handle 4 protrudes from the front wall of the case body 1.

The overcurrent detection mechanism section A is configured to freely move the iron piece into a container filled with oil (for example, silicone) when an overcurrent flows through the coil 5, which is connected to the above-mentioned main circuit through a connecting wire (not shown). The armature 7 is rotated by the suction force generated in the oil dash pot 6 inserted into the oil dash pot 6.

A kick-out portion 7a is integrally formed on the armature 7 and extends in a bent shape, and is rotatably supported by a pin 9 provided on a yoke 8.

Further, the detaching mechanism section B has one end attached to the handle 4 with a pin 1.
A tripping rod 11 rotatably connected by a pin 13 and a tripping rod 14 having one end rotatably connected by a pin 13 to the middle part of a movable contact plate 12 integrally provided with a movable contact 2 are connected. 15 to be rotatably connected to each other, a trip rod 16 is swingably attached to a location closer to the armature 7 than the pin 15 of the tripping rod 14, and the semicircular portion 16a thereof is removed. Rod 11
It has a structure in which it is disposed opposite to the retaining portion 11a so as to be freely engageable and detachable.

The trip lever 16 is always urged clockwise in the figure by a spring (not shown), and is normally in contact with the stopper 14a of the bow removal stopper 14 at the retaining portion of the trip lever 11. 11a and the semicircular part 16a of the trip rod 16
is engaged with the edge part of the lever 1.
1 and a trip stopper rod 14 are adapted to move together. That is, in this state, the movable contact plate 12 can be rotated by manual operation of the handle 4 to bring the movable contact 2 into contact with and away from the fixed contact 3.

Now, when the handle 4 is turned from the OFF state shown in FIG. 5 to the right in the drawing to turn it into the ON state shown in FIG.
to face. In this state, when an overcurrent flows through the coil 5 connected to the main circuit and the armature 7 is attracted to the oil dash pot 6 and rotates, the tip of the kick-out portion 7a of the armature 7 is pushed against the trip rod 16. Uke is part 1
6 is pushed, the trip lever 16 rotates, and the engagement between the edge portion of the semicircular portion 16 and the retaining portion 11a of the trip lever 11 is released. Therefore, due to the action of the movable contact spring 17 that biases the movable contact plate 12 in the counterclockwise direction in the figure, the tripping rod 11 and the tripping lever 14 are folded around the pin 15 as a fulcrum, as shown in FIG. At the same time, the movable contact 2 separates from the fixed contact 3, and the handle 4 momentarily enters the trip state, and then the handle 4 returns to the off position due to the action of a handle spring (not shown) and becomes the state shown in FIG. 5, and the trip rod 16
The semicircular portion 16a of the handle 4 and the engaging portion 11a of the lever 11 are brought into engagement again, allowing the handle 4 to open and close the circuit.

<Problems to be Solved by the Invention> However, the circuit breaker has various problems. That is, since the yoke 8 is configured to rotatably support the handle 4 and the movable contact plate 12 in addition to the armature 7, the yoke 8 supports the armature 7 and the handle 4.
In order to cross and pivotally support each pivot pin of the movable contact plate 12, the frame is bent into a U-shape as a whole, and a complicated structure is provided with mounting parts for the handle 4 and the movable contact plate 12 at both ends. The problem is that the yoke 8 is difficult to manufacture and manage.

Further, an assembly in which the tripping mechanism B and the handle 4 are attached to the yoke 8 of the overcurrent detection mechanism A and the entire assembly is housed inside the case body 1, and the yoke 8
Since the coil 5 is integrated with the coil 5, it is necessary to manufacture the entire assembly for each cut-off current value, compared to the multiple types of coils 5 that are manufactured for different cut-off current values, resulting in poor productivity and inventory management. is difficult.

Furthermore, during assembly, it is necessary to insert the support pins 18 and 19 into the bent inside of the yoke 8 with the handle 4 and the movable contact plate 12 sandwiched together with these springs, and to attach each spring by a three-dimensional assembly operation. Therefore, it has the disadvantage of extremely poor workability. The above problems are factors that lead to high costs.

Furthermore, since the handle 4 is attached to the yoke 8, which is a charged object, it is difficult to secure a sufficient insulation creepage distance from the charged object to the surface of the case body 1. The reality is that parts are attached, which also contributes to the high cost.

The present invention has been made in view of these conventional problems, and a technical problem is to provide a circuit breaker that has excellent productivity and workability, can be manufactured at low cost, and can be easily managed in inventory. It is something to do.

<Means for Solving the Problems> In the present invention, as a technical means for achieving the above-mentioned problems, a circuit breaker is configured as follows. That is, there is an overcurrent detection mechanism that rotates the armature by the attractive force generated in the magnet of the coil due to the overcurrent, and a movable contact that is activated by the rotation of the armature to close the main circuit and separate it from the fixed contact. The tripping mechanism section is
In the circuit breaker, the circuit breaker is housed in a case body and has a handle protruding from the outside of the case body for manually operating the tripping mechanism so as to bring the movable contact into contact with and away from the fixed contact. The armature is pivotally attached to a mounting portion formed at one end of the yoke, and a single support piece provided with a mounting hole projects from the other end of the yoke. The current detection mechanism unit is housed in the case body with at least two parts thereof fitted into positioning parts of the case body, and the handle is rotatably attached to a support part integrally formed with the case body. A movable contact plate supported and provided with the movable contact is rotatably attached by a pivot pin inserted between and inserted between a shaft support integrally formed in the case body and the mounting hole, and It is electrically connected to the coil by a connecting wire, and both ends of the tripping mechanism are rotatably connected to the handle and the movable contact plate, respectively.

<Operation> The operation of activating the tripping mechanism upon detection of overcurrent to separate the movable contact from the fixed contact is similar to that of the existing one. In this circuit breaker, the handle is attached to the case body, and the movable contact plate is attached between the shaft support of the case body and the support piece of the yoke, so that the yoke is attached to one end. It has a simple shape with just a support piece on the armature mounting part and the other end, making it easy to manufacture and eliminating the conventional circuit breaker that must be integrated because the handle and movable contact plate are attached to the yoke. Unlike conventional devices, the overcurrent detection mechanism consists of a coil, yoke, and armature, and the tripping mechanism block consists of a handle, tripping mechanism, and movable contact plate, and each can be assembled and managed separately. These can be interconnected when incorporated into the case body. Therefore, the overcurrent detection mechanism section can be assembled and managed according to the cutoff current value of the coil, and necessary items can be combined with the tripping mechanism section at the time of assembly, thereby simplifying inventory management.

Furthermore, during assembly, the handle spring only needs to be suspended between the handle and the case body after the handle is inserted into the support part, and the spring of the movable contact plate is suspended between the movable contact plate and the yoke stacked on the pivot support of the case body. All you have to do is insert the pin between the support piece and the support piece, and it is easy to attach. In addition, the overcurrent detection mechanism section is positioned by inserting its two parts into the positioning section of the case body, and on the other hand,
The pull-out mechanism block has a handle that fits into the support part,
In addition, the movable contact plate is rotatably attached to the shaft support of the case body and the yoke with pins, so that it is positioned at two locations, and the separately assembled overcurrent detection mechanism section and tripping mechanism block can be operated without any trouble. It can be linked and connected like this.

Furthermore, since the handle is attached to the case body, which is usually integrally molded from synthetic resin, and is electrically insulated from the yoke, which is a charged object, the insulating creepage distance from the charged object to the surface of the case body is sufficient. can be secured.

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view of an embodiment of the present invention with the cover removed, FIG. 2 is a right side view of the main parts, and FIG. 3 is an exploded front view. The overcurrent detection mechanism section A' includes a coil 20. Oil Dash Pot 21. The yoke 22 and the armature 23 are composed of the same types of parts as conventional ones, but the main feature is the shape of the yoke 22, with only one end (the upper part in the figure) being U-shaped, and the mounting part 22 of the armature 23
It has a simple shape with a single supporting piece 22c having a mounting hole 22b formed therein protruding from the other end. An armature 23 is rotatably supported by a pin 24 on the mounting portion 22a, and the armature 23 is rotatably biased in a direction to separate from the oil dash pot 21 by an armature spring 25 wound around the pin 24. ing.

This overcurrent detection mechanism section A' connects the protruding section 22 at the other end of the yoke 22 to the case body 2, as shown by the one-dot chain arrow in FIG.
Case body 2
It is equipped with 6.

The tripping mechanism section B' includes a tripping lever 27. It is composed of the same parts as the above-mentioned conventional circuit breaker, such as the trip stopper rod 28 and the trip rod 29, and functions in the same way, but each part of the conventional product had a complicated configuration made by press processing. On the other hand, both have simplified configurations made by casting.

In particular, the trip stopper rod 28 has a U-shape in conventional circuit breakers, but is simply plate-shaped, with a small piece 28a of the trip stopper 27 on one end and a trip stopper on the other end. The stoppers 28b of the rod 29 are provided protruding in opposite directions, and the locking piece 2 of the trip rod spring 30 is located in the center.
．． 8c is formed into a cut and raised shape. Therefore, the tripping rod 27°, the tripping rod 28, and the tripping rod 2
9 are stacked one after another and are rotatably connected to each other by caulking the pins 31 and 32. It can be assembled by a simple operation. In addition, the trip rod 27 and the trip rod 2
9 is adapted to be engaged and disengaged by an engaging portion and a semicircular portion (not shown), similar to conventional circuit breakers.

The handle 33, which is rotatably connected to the tripping rod 27 by a pin 32, has a fulcrum shaft 33a integrally projecting from the back as shown in FIG. By inserting it into the cylindrical support part 26c integrally molded with the 26, the angle θ shown in FIG.
It is attached so that it can rotate freely within the range (°). The handle spring 34 is fitted into a semicircular groove 33b formed on the front surface of the handle 33, has one end engaged with a locking hole 33c of the groove 33, and has the other end inserted into the case. It is hooked and attached to the insulating wall 26d of the body 26.

An end of a tripping rod 28 is rotatably connected to the center of a movable contact plate 36 having a movable contact 35 at one end with a rivet 38, and a tripping spring 37 wound around the rivet 38 is pulled out. A hook is fixed between the locking rod 28 and the movable contact plate 36.

The movable contact plate 36 has an elongated support hole 36a drilled at the other end between the cylindrical shaft support 26e of the case body 26 and the attachment hole 22b of the support piece 22c of the yoke 22. The movable contact spring 39 is interposed with the movable contact spring 39 for use, and is rotatably supported by a pin 40 inserted therein, and both ends of the movable contact spring 39 are latched to the movable contact plate 36 and the support piece 22c. The movable contact 35 is constantly biased in a direction to separate from the fixed contact 41.

In addition, 42 and 43 in Figure 1 are external connection terminals and 4
4.45 is the case body 26 and the cover integrated 4 which is superposed on it.
6, a pair of fittings are sandwiched between the case body 26 and the cover body 46; 47 is an arc chute plate; 48 is a mounting rivet; and 49 is a back cover that closes the gap between the case body 26 and the cover body 46.

Next, the assembly procedure of the above embodiment will be explained.

In this circuit breaker, the handle 33 is attached to the case body 26, and the movable contact plate 36 is attached between the shaft support 26e of the case body 26 and the support piece 22 of the yoke 22. Since there is no need to integrate the coil 20. as shown in FIG. An overcurrent detection mechanism section A' consisting of a yoke 22 and an armature 23, and a handle 33. The tripping mechanism section B' and the tripping mechanism block consisting of the movable contact plate 36 are divided and assembled separately, and these are interconnected when assembled into the case body 26. That is, external connection terminal 42.4
3 into the mounting groove of the case body 26 as shown by the dashed-dotted line arrow in FIG. It is rotatably inserted and installed in the case body 26 with the support hole 36a of the movable contact plate 36 facing the shaft support 26e of the case body 26.

Next, the overcurrent detection mechanism section A' is positioned by two points by fitting the pin 24 into the circular recess 26b of the case body 26 and fitting the protrusion 22d of the yoke 22 into the side groove 26a of the case body 26. By installing the coil 20 in the case body 26 in this state, one end of the winding of the coil 20 contacts the external connection terminal 42 in an electrically connected state, and the mounting hole 22b of the support piece 22c faces the support hole 36a in an overlapping state. do. next,
One end of the handle spring 34 is engaged with the locking hole 33c of the handle 33 and inserted into the groove 33b, and then the other end is hooked and attached to the insulating wall 26d. In addition, the movable contact spring 39, as shown by the one-dot chain arrow in FIG.
After inserting the pin 40 from the side into the gap between the movable contact plate 36 and the support piece 22c, the pin 40 is inserted into the mounting hole 22b and the movable contact spring 3.
9 and support hole 36a to fit into shaft support 26e, and both ends of movable contact spring 39 are hooked to movable contact plate 36 and support piece 22c. As a result, the tripping mechanism block is positioned at two locations, the support portion 26c and the shaft support portion 26e of the case body 26, and is placed in an appropriate state to respond to the overcurrent detection mechanism portion A'.

Next, the end of the connecting wire 36b of the movable contact plate 36 is soldered to the other end of the coil 200 winding as shown by the one-dot chain arrow in FIG. The main circuit can be opened and closed by electrically connecting it to the mechanism block.
Finally, the cover unit 46 is superimposed and fixed on the case body 26 to form an outer body.

The opening/closing operation of the main circuit by manual operation of the handle 33 and the breaking operation of the main circuit by detecting an overcurrent are the same as those of the conventional circuit breaker described in FIGS. 4 to 6, and therefore their explanation will be omitted.

In this circuit breaker, the yoke 22 has a simple shape that includes a mounting portion 22a for the armature 23 at one end and a support piece 22c at the other end.
can be easily produced.

Furthermore, as is clear from the above explanation of the assembly procedure, the overcurrent detection mechanism section A', the handle 33 and the movable contact plate 3 are also included.
6 and the block of the tripping mechanism section B', which can be assembled separately. Since the necessary parts can be combined with the tripping mechanism section B', manufacturing and inventory management are simplified.

Further, when assembling, the handle spring 34 may be hooked onto the handle 33 and the case body 26 after the handle 33 is inserted into the support portion 26c, and the movable contact spring 37 may be attached to the handle 33 and the case body 26.
Movable contact plate 3 stacked on the shaft support 26e of the case body 26
6 and the support piece 22c of the yoke 22, and then the pin is inserted through these and then hooked to the movable contact plate 36 and the support piece, and both can be easily attached.

The overcurrent detection mechanism A' is positioned by inserting the protrusion 22d and the pin 24 into the side groove 26 and the circular recess 26b of the case body 26, respectively. The handle 33 is attached to the support part 2
6c, and the pin 4 is inserted between the movable contact plate 36 and the shaft support 26e of the case body 26 and the support piece 22c of the yoke 22.
The overcurrent detection mechanism section A' and the tripping mechanism block, which are separately assembled, can be connected in association with each other so as to operate without any trouble.

Furthermore, the handle 33 is attached to the case body 26 integrally molded from synthetic resin and is electrically insulated from the yoke 22, which is a charged object, and the insulating wall 26d is integrally formed on the case body 26. Due to this, a sufficient insulation creepage distance from the charged object to the surface of the case body 26 can be ensured without using a separate member for insulation.

<Effects of the Invention> As described above, according to the circuit breaker of the present invention, the yoke has a simple shape, which makes it easy to manufacture and manage. The blocks of the trip mechanism including It is possible to classify, assemble and manage the items, and combine the necessary items with the tripping mechanism, which improves productivity and simplifies inventory management.

Furthermore, during assembly, the handle spring and movable contact spring can be easily attached, greatly improving work efficiency.

Therefore, the manufacturing cost can be significantly reduced.

Moreover, the overcurrent detection mechanism section and the tripping mechanism block, which are assembled separately, can be connected in association so that they operate without any trouble when installed inside the case body.

Furthermore, there is an advantage that a sufficient insulation creepage distance from the charged object to the surface of the case body can be ensured without using a separate member for insulation.

[Brief explanation of drawings]

FIG. 1 is a partially removed front view of one embodiment of the present invention, and FIG.
The figure is a right side view of the main parts of Figure 1, Figure 3 is an exploded front view of Figure 1, Figure 4 is a cutaway front view of a conventional circuit breaker in the on state, and Figure 5 is the same as Figure 4. Cutaway Front View FIG. 6 is a front view of a portion of FIG. 4 in the tripped state. 20-Coil 21-Oil dash pot (magnet) 22-
Yoke 22 a - m - Mounting part 22b - Mounting hole 2c 3 6 6a 6b 6c 6e 3 5 6 6b 0 1 - Support piece armature case body side groove (positioning part) Circular recess (positioning part) - Support part shaft Branch handle movable contact movable contact plate, connection wire, pivot pin fixed contact

Claims (1)

[Claims] (1) An overcurrent detection mechanism that rotates the armature using the attractive force generated in the magnet of the coil due to overcurrent, and a movable contact that is activated by the rotation of the armature to close the main circuit, which separates the movable contact from the fixed contact. a circuit breaker, wherein a tripping mechanism section is housed inside the case body, and a handle for manually operating the tripping mechanism section protrudes from the outside of the case body so as to bring the movable contact into contact with and away from the fixed contact. In the device, the overcurrent detection mechanism section is pivotally mounted on the armature to a mounting section formed on one end side of the yoke,
In addition, a single support piece provided with a mounting hole is configured to protrude from the other end of the yoke, and the overcurrent detection mechanism unit is configured such that at least two parts of the support piece are fitted into positioning parts of the case body. and the handle is installed inside the case body, and the handle is
A movable contact plate rotatably supported by a support portion integrally formed on the case body and provided with the movable contact is interposed between the shaft support integrally formed on the case body and the mounting hole. and is electrically connected to the coil by a connecting wire, and both ends of the tripping mechanism are rotatably connected to the handle and the movable contact plate, respectively. A circuit breaker.