JP4155761B2 - Circuit breaker for wiring - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker provided with an electromagnetic instantaneous trip device.
[0002]
[Prior art]
The circuit breaker for circuit breaks the circuit when overcurrent flows, and with the time trip device using the bimetal that operates during normal overcurrent, the instantaneous circuit breaker that operates when extremely large overcurrent flows. Usually, a removal device is provided. This instantaneous trip device basically sends a circuit current to the electromagnetic coil, attracts the momentary trip piece by the generated electromagnetic force, and operates the trip mechanism by moving the momentary trip piece. With the downsizing of the circuit breaker for wiring, electromagnetic coils are often used in which a U-shaped yoke is attached to a conductor through which a circuit current flows.
[0003]
Many of these miniaturized circuit breakers for wiring are divided into a case in the vertical direction, and parts are mounted and assembled from one side, and an instantaneous tripping device is conventionally incorporated as shown in FIGS. 14 to 16, for example. . The momentary trip piece is normally held at a fixed position separated from the yoke, and is attracted when an overcurrent flows to operate the trip mechanism. A spring is used to hold it.
[0004]
The one shown in FIG. 14 uses a coil spring as a spring for holding the instantaneous trip piece in a state of being separated from the yoke. A yoke 14 is mounted on one side 1a of the case and is opposed to the yoke 14. The instantaneous trip piece 15 is mounted so as to be swingable about the shaft portion 15a, and the spring 16 is mounted in a compressed state between the base end portion of the instantaneous trip piece 15 and one of the cases 1a. ing. Further, FIG. 15 uses a torsion spring as a spring, and the spring 16 is mounted between the intermediate portion of the instantaneous trip piece 15 and one of the cases 1a in a deformed state. When these wire springs are used, it is necessary to incorporate the spring in a compressed or deformed state against the spring force of the spring. It was difficult. Therefore, many assembly steps are required, and there is a problem that costs increase.
[0005]
In order to solve these problems and facilitate assembly, a plate spring is used in advance to connect the yoke 14 and the instantaneous tripping piece 15 with the spring 16 to form an integrated unit, and the unit is assembled as shown in FIG. It was thought to do. However, in such a structure, it is necessary to make the leaf spring in a complicated shape in order to make the leaf spring have both spring property and a connecting function. Further, the leaf spring must be fixed to either the yoke 14 or the instantaneous tripping piece 15 by caulking, welding, or the like, and the cost for unitizing these separate processes can increase the overall cost as a result. There was sex.
[0006]
[Problems to be solved by the invention]
The present invention solves the above-described problems, and it is not necessary to compress or deform the spring that holds the instantaneous tripping piece in place at the time of assembly, and a circuit breaker for wiring that can be easily assembled and reduced in manufacturing cost. It was made to provide.
[0007]
[Means for Solving the Problems]
The circuit breaker of the present invention made to solve the above problems is incorporated in a case divided in the vertical direction, and is equipped with an electromagnetic instantaneous trip device that interrupts an overcurrent when an abnormal current flows. in circuit breaker comprising, either instantaneously trip strips of the divided cases provided housing portion of the spring held in place, to deform the spring by coalescing the case to the other of the divided cases The spring push-in protrusion is provided so as to be pushed into the storage portion and to support the free end portion of the spring on the end edge of the spring storage portion and the spring support portion of the instantaneous trip piece . In addition, it is preferable that the storage part of the spring has a structure in which the torsion spring is stored in the vertical direction toward the case.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be specifically described with reference to the drawings.
1 and 2 show an example in which the present invention is applied to a plug-in type circuit breaker incorporated in a distribution board and connected to a main bar. It is a front view which shows the state just before attaching the components which comprise the circuit breaker for wiring to one side 1a, and uniting the other of a case. The power supply side connection terminals 2 and 3 are provided at the left end of one case 1a, and the load side connection terminal 4 is provided at the right end. Here, the power supply side connection terminals 2 and 3 are plug-in type terminals for connecting the main bar, and the load side connection terminal 4 is a screwless terminal, but can be arbitrarily changed.
[0009]
A handle 6 is pivotally supported by a rotating shaft 5 at the upper part of one case 1a, and an opening / closing mechanism 7 is provided inside the case one 1a. The opening / closing mechanism section 7 is provided with a movable contact 9 that is pivotally supported by a shaft 8 and whose lower portion swings like a pendulum, and incorporates a known tripping mechanism. A movable contact 10 is provided at the tip of the movable contact 9, and a fixed contact 12 provided at the tip of the fixed contact 11 connected to the load side connection terminal 4 is opposed to the movable contact 10. The opening / closing mechanism unit 7 operates the handle 6 to swing the movable contact 9 to switch between a closed state in which the movable contact 10 and the fixed contact 12 are in contact with each other or an open state in which the movable contact 10 and the fixed contact 12 are separated from each other. When a large current such as the above flows, an instantaneous trip piece 15 to be described later is interrupted by pushing a projection 13 provided on the trigger lever of the trip mechanism, and the circuit is opened.
[0010]
The instantaneous tripping device includes a yoke 14, an instantaneous tripping piece 15 facing the opening of the yoke 14, and a spring 16 that holds the instantaneous tripping piece 15 in a fixed position away from the yoke 14. A conductor 17 through which the gas flows is inserted. The yoke 14 is formed in a U-shape as shown in FIG. 3, and the opposing instantaneous tripping piece 15 has a shaft portion 15a serving as a swing center on the base end side and a distal end portion as shown in FIG. An action portion 15b that engages with the protrusion 13 is provided, and a base end portion is bent and a spring support portion 15c is provided. The opening / closing mechanism portion 7 is configured such that when the handle 6 is closed, the projection 13 is positioned immediately before the action portion 15b.
[0011]
5 and 6 show the details of the instantaneous tripping device portion with only the yoke 14 mounted, FIG. 5 is an enlarged front view of the main part, and FIG. 6 is a section AA in FIG. FIG. The yoke 14 is mounted on a yoke mounting portion provided on one side 1a of the case. One of the cases 1a is provided with a shaft hole 18 for supporting the shaft portion 15a of the instantaneous trip piece 15 and a spring storage portion 19, and the other 1b of the case is positioned opposite to the shaft hole 18 as shown in FIG. A spring insertion protrusion 21 is provided at a position where the shaft hole 20 faces the spring housing portion 19. The spring accommodating portion 19 has substantially the same dimensions as the main body portion around which the spring 16 is wound.
[0012]
FIGS. 8 to 13 show the procedure for mounting the instantaneous trip piece 15 and the spring 16. In the state shown in FIGS. 5 and 6 with the yoke 14 attached, the instantaneous trip piece 15 faces one side 1a of the case. When the shaft portion 15a is inserted into the shaft hole 18, the state shown in FIGS. Next, when the spring 16 faces the spring accommodating portion 19 and the spring 16 is dropped into the spring accommodating portion 19, the main body portion of the spring 16 enters the spring accommodating portion 19 as shown in FIGS. It is in a state of being supported by the end edge of the storage portion 19 and the spring support portion 15 c of the instantaneous trip piece 15.
[0013]
Here, if the other side 1b of the case faces the one side 1a of the case and the other side 1b of the case is united with the one side 1a of the case, the spring push-in protrusion 21 pushes in the spring 16, and the spring 16 is shown in FIGS. In this way, it is deformed and pushed between the end surface of the spring accommodating portion 19 and the spring support portion 15c, and a load of the spring is generated, and the lower end portion of the instantaneous trip piece 15 is pushed to the left in the drawing. . That is, the spring pushing protrusion 21 becomes a spring load generating portion. As a result, the instantaneous tripping piece 15 is pushed to the left below the shaft portion 15 a and the upper portion moves to the right, and the upper portion is held away from the yoke 14. When the spring 16 is attached, it is not necessary to compress or deform the spring 16.
[0014]
In the case of a double-circuit breaker for wiring, a partition is provided between one case 1a and the other case 1b, and the other side 1b of the case is disposed on the side of the partition facing the first case 1a. Similarly, it is preferable to provide the shaft hole 20 and the spring push-in projection 21 and provide the shaft hole 18 and the spring accommodating portion 19 on the side of the partition facing the other 1b of the case, like the case 1a. By using such a partition wall, the yoke 14 of one pole, the instantaneous tripping piece 15 and the spring 16 can be mounted between the case 1a and the partition wall in the same procedure, and the partition wall and the other case 1b. The yoke 14 of the other pole, the momentary tripping piece 15 and the spring 16 can be mounted between them. It is not necessary to compress or deform the spring 16 when mounting the spring 16 of any pole.
[0015]
In the circuit breaker configured as described above, the instantaneous trip piece 15 is securely held at a fixed position by the spring 16, and is remarkably connected to a circuit connected in a closed state by the operation of the handle 6. When a large overcurrent flows, an overcurrent flows through the conductor 17 and a large magnetic force is generated at the open end of the yoke 14, and the instantaneous trip piece 15 is attracted. When the instantaneous tripping piece 15 is sucked by the yoke 14, the instantaneous tripping piece 15 swings around the shaft portion 15a, the action portion 15b pushes the projection 13, and the opening / closing mechanism portion 7 is cut off to be in an open state. The current will be cut off.
[0016]
【The invention's effect】
According to the present invention described above, the spring for holding the instantaneous trip piece in a fixed position is dropped into the spring housing portion in a free state at the time of assembly, and the other side of the case is combined to generate the load of the spring. Therefore, there is an advantage that it is not necessary to compress or deform the spring when the spring is assembled, and it is easy to assemble and does not require many assembly steps. Therefore, it is extremely large that it contributes to the industry as providing a circuit breaker that solves all the conventional problems.
[Brief description of the drawings]
FIG. 1 is an internal structural diagram of a closed state showing an embodiment of the present invention.
FIG. 2 is an internal structural diagram of a shut-off state showing an embodiment of the present invention.
3A and 3B show details of the yoke, in which A is a front view, B is a side view, and C is a plan view.
FIGS. 4A and 4B show details of an instantaneous trip piece, in which A is a front view and B is a side view.
FIG. 5 is a front view showing details of an instantaneous tripping device portion.
6 is a cross-sectional bottom view taken along a line AA in FIG.
FIG. 7 is a rear view showing the other inner surface of the case.
FIG. 8 is a front view showing details of an instantaneous tripping device portion in a state where an instantaneous tripping piece is mounted.
9 is a cross-sectional bottom view taken along a line AA in FIG.
FIG. 10 is a front view showing details of an instantaneous tripping device portion in a state where a spring is dropped.
11 is a cross-sectional bottom view taken along the line AA in FIG.
It is a perspective view of a support part.
FIG. 12 is an internal front view showing details of an instantaneous trip device portion in a state where assembly is completed.
13 is a cross-sectional bottom view taken along line AA in FIG.
FIG. 14 is a front view of a main part showing an example of a conventional instantaneous tripping device.
FIG. 15 is a front view of a main part showing another example of a conventional instantaneous tripping device.
FIG. 16 is a front view of a main part showing still another example of a conventional instantaneous tripping device.
[Explanation of symbols]
1a One side of the case 1b Other side of the case 2, 3 Power supply side connection terminal 4 Load side connection terminal 5 Rotating shaft 6 Handle 7 Opening / closing mechanism part 8 Axis 9 Movable contact 10 Movable contact 11 Fixed contact 12 Fixed contact 13 Protrusion 14 Yoke 15 Instantaneous trip piece 15a Shaft portion 15b Action portion 15c Spring support portion 16 Spring 17 Conductor 18 Shaft hole 19 Spring storage portion 20 Shaft hole 21 Spring push-in projection

Claims (2)

In a circuit breaker equipped with an electromagnetic instantaneous trip device that is incorporated in a case divided in the vertical direction and cuts off overcurrent when an abnormal current flows, an instantaneous trip piece is provided on one side of the divided case. A spring housing portion is provided to hold the spring in a fixed position, the case is combined with the other of the divided cases , and the spring is pushed into the housing portion while being deformed, and the free end of the spring is connected to the edge of the spring housing portion. 2. A circuit breaker for wiring, comprising a spring push-in projection that is supported by a spring support portion of an instantaneous trip piece .   2. The circuit breaker according to claim 1, wherein the spring housing portion is structured such that the torsion spring is vertically housed toward the case.

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