JPS5852607Y2 - circuit break - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a circuit breaker that detects overcurrent and interrupts a circuit.

This type of circuit breaker usually detects an abnormal state using an electromagnetic device for abnormality detection, and operates an opening/closing mechanism to interrupt the circuit.

The electromagnet device for abnormality detection has an oil case with a plunger inserted inside the electromagnetic coil interposed in the circuit, and an armature that is rotatable relative to the pole of the coil case. When an abnormal current flows, the plunger in the oil case is moved with a time delay characteristic to attract the armature, and in conjunction with this, the opening/closing mechanism is operated.

By the way, conventionally, the oil case of the above-mentioned electromagnet device has been attached to the frame by soldering with the pole upward, which takes time to assemble, increases costs, and causes variations in pole position, etc., resulting in unstable operating conditions. There is a possibility that it will become certain.

Therefore, for example, as shown in Japanese Patent Application Laid-Open No. 50-96882, there is a device in which the pole is mounted inside the container with the pole facing downward, and the armature is rotatably provided with respect to the pole.

However, this requires some kind of stopper mechanism to set the distance between the armature and the pole at a predetermined position, making the structure complex and making adjustments during assembly difficult.

The present invention is an attempt to improve these points, and it is possible to easily assemble an electromagnetic device for abnormality detection equipped with an armature, and the assembly work can be performed quickly.
The position of the armature relative to the pole can be easily set at a constant position, and operation can be ensured.

The present invention also includes an opening/closing mechanism, a drive mechanism for driving the opening/closing mechanism, a tripping mechanism for controlling the driving mechanism, an electromagnetic device for abnormality detection that operates the tripping mechanism, and a base. The electromagnetic device for abnormality detection includes a frame fixed to the base and forming a magnetic guide part, and a plunger provided inside the frame and a support part formed opposite to the bottom part of the base. A movably inserted oil case, a pole attached to the lower end of the oil case and supported downwardly on the abutment, and an oil case attached to the outer periphery of the oil case and interposed in the circuit of the opening/closing mechanism. The electromagnetic coil is provided rotatably with respect to the pole, and has an armature that is normally locked to the bottom of the base and operates the tripping mechanism by rotation of the armature.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Reference numeral 1 denotes a rectangular base integrally formed of an insulating synthetic resin. A power supply terminal 2 is fixed to one end of the base 1, and a terminal screw 3 is screwed into the power supply terminal 2.

A fixed contact plate 14 is integrally provided inside the power source terminal 2, and a fixed contact 5 is attached to the top surface of the tip of the fixed contact plate 4.

Further, a load side terminal 6 is fixed to the other end of the base 1,
A terminal screw 7 is screwed into this load side terminal 6.

A first frame 1 is integrally formed with a magnetic metal material on the base 1 between the power supply side terminal 2 and the load side terminal 6.
This first frame 11 is provided with one bearing part 12, and bearing pieces 13 are provided on both sides of this bearing part 12.
is erected, and one end of a movable contact plate 15 is rotatably supported by a support shaft 14 on the bearing pieces 13 on both sides through an elongated hole 16 in the vertical direction. A movable contact 17 facing the fixed liquid point 5 is attached, a coil spring 18 is interposed between the upper surface of the base 1 and the middle part of the movable contact plate 15, and the movable contact plate 15 is always a fixed contact. The movable contact 17 is urged upward away from the contact 5, and an opening/closing mechanism 19 is configured.

A substantially inverted magnetic guide portion 21 is formed on the other side of the first frame 11, and an oil dashpot 22 is provided on this magnetic guide portion 21.

This oil dash pot 22 is connected to an oil case 2 made of a non-magnetic material and containing oil from the upper side of the magnetic guide part 21.
A plunger 24 is inserted into the oil case 23 so as to be movable up and down, and a coil spring 25 is interposed below the plunger 24. A pole 26 made of a magnetic material is attached to the opening at the lower end of the oil case 23, and a flange 27 having a larger diameter than the pole 26 is formed at the outer periphery of the lower end of the oil case 23.

An electromagnetic coil 2 is attached to the outer periphery of the oil case 23.
8 is attached, and this electromagnetic coil 28 is clamped and fixed between the upper side of the magnetic guide part 21 in the first frame 11 and the flange 27 of the oil case 22, and the lead part at one end of the electromagnetic coil 28 is fixed. 29 is the movable contact plate 1
5 by soldering, spot welding, etc., and the lead portion 30 at the other end of the electromagnetic coil 28 is connected to the load side terminal 6 by soldering, spot welding, etc.

Further, an armature 31 is rotatably supported on the shafts 14 of the bearing pieces 13 on both sides of the first frame 11, and a pressing piece 32 extends upward from the base of the armature 31. In addition, the armature 31 is always urged downward by a spring 33, and a first
An abnormality detection electromagnet device 34 for detecting overcurrent is configured including the frame 11 .

Then, the bearing portion 12 of the first frame 11 is placed on the base 1 and fixed with screws 35 from below.

Furthermore, the pole 26 of the oil case 23 is fitted into a through hole 37 in the abutment part 36 formed facing downward to the bottom part 1a of the base 1, so that its lower surface is flush with the lower surface of the abutment part 36. At the same time, the flange 27 of the oil case 23 is fitted into a recess 38 on the upper outer periphery of the through hole 37 .

The tip of the armature 31 is abutted against and locked on the bottom side 1a of the base 1 as a stopper surface, and the distance from the pole 28 is maintained constant.

Further, a drive mechanism 41 for driving the opening/closing mechanism 19 is provided on the base 1.

In this drive mechanism 41, a handle 44 is rotatably supported by a support shaft 43 on the upper part of a second frame 42 which is fixed adjacent to the first frame 11 and has a rectangular shape in plan view. The handlebar is always biased clockwise in FIG. 1 by a spring 45.

A connecting shaft 46 is attached to the lower end of the base of the handle 44.
The upper end of the first link 47 is rotatably connected, and the second link is connected to the lower end of the first link 47 by a connecting shaft 49 inserted into the arcuate groove 48 of the second frame 42. 50
are rotatably connected to each other, and this second link 50
The upper end of a third link 52 is rotatably connected to one end by a connecting shaft 51, and the lower end of this third link 52 is connected to the movable contact plate 15 by a connecting shaft 53 on the side opposite to the support shaft 14. are rotatably connected.

The upper part of an engaging body 55 having a hollow shape in plan view is rotatably supported on the upper part of the second frame 42 by a support shaft 54, and a convex arc-shaped guide surface 56 is formed on this engaging body 55. An engagement shaft 5 provided at the other end of the second link 50 on this guide surface 56
7 are abuttingly engaged.

Furthermore, a tripping body 59 integrally formed in a substantially L-shape with synthetic resin is rotatably supported by a support shaft 58 at a position adjacent to the engaging body 55 of the second frame 42 . A retaining portion 60 is formed at the middle upper part of the engaging body 55 and is detachably engaged with the engaging body 55.
An operating part 61 facing the pressing piece 32 of the armature 31 is provided at the lower part of the electromagnet device 3 for detecting abnormality.
A trip mechanism 62 is configured which is operated by the drive mechanism 4 and controls the drive mechanism 41.

Next, the operation will be explained.

First, to turn on the handle, turn the handle counterclockwise in FIG.

This rotation of the handle 44 pushes down the first link 47 via the connecting shaft 46, moves the connecting shaft 49 downward along the arcuate groove 48, pushes down the second link 50, and pushes down the connecting shaft 51. ．． Third link 52 and connecting shaft 53
The movable contact plate 15 is pushed down against the elasticity of the spring 18, and the movable contact 17 contacts the fixed contact 5 of the fixed contact plate 4, turning on the circuit as shown in FIG.

Then, the on state is maintained in a state where each shaft portion exceeds the reversal point.

In this state, when an overcurrent flows through the electromagnetic coil 28, the relationship between the downward electromagnetic force received by the plunger 24 in the oil case 23 and the spring 25 is 100% of the rated value.
With current, plunger 24 operates but does not trip, and 1
At 25% current, the viscosity of the oil causes it to be pulled down toward the pole 26 with a time delay characteristic, and the pole 26, the plunger 24, the magnetic guide section 21 of the first frame 11. A magnetic circuit is formed in the armature 31, the magnetic flux interlinking with the armature 31 increases, and the armature 31 is attracted.

When this armature 31 is attracted and rotates upward,
The pressing piece 32 pushes the actuating part 61 of the tripping body 59, which causes the tripping body 59 to rotate clockwise in FIG. 5
5 is disengaged, the movable contact plate 15 is pushed up by the restoring force of the spring 18, and the movable contact 17 is separated from the fixed contact 5, turning off the circuit.

At the same time, the handlebar is rotated back by the spring 45.

In addition, in the ON state of the circuit, by rotating the handle in the opposite direction, the first link 47 and the second link
The third link 50 and the third link 52 can be rotated, and the movable contact plate 15 can be released from being pressed down to return to the OFF state.

In the above embodiment, the upper and lower ends of the electromagnetic coil 28 are supported between the upper side of the magnetic guide section 21 in the first frame 11 and the flange 27 of the oil case 23 via insulating spacers. , as shown in FIGS. 4 and 5, an annular protrusion 36 a is integrally provided on the outer periphery of the recess 38 in the abutment 36 of the base 1.
The electromagnetic coil 28 may be placed on the protrusion 36a to provide a lower spacer effect.

Furthermore, the bottom portion 1a that abuts and supports the armature 31 is
As shown in FIGS. 4 and 5, the portion of the armature 31 that comes into contact with the tip may be formed in a step shape.

Further, the spring 33 that biases the armature 31 is not only provided on the support shaft 14 but also interposed between the tip of the armature 31 and the support part 36 of the base 1, as shown in FIGS. 4 and 5. You can do it like this.

By doing so, the spring 33 can be assembled from below the base 1, making assembly easy.

Furthermore, as shown in FIG. 5 and FIG. By individually identifying the portion 31b of No. 2 by caulking or the like later, assembly becomes easier.

In the above embodiments, the electromagnetic device for abnormality detection is described as one that detects current flow, but is not limited to this, and may include one that detects abnormal current such as electric leakage, etc.
Various types of known abnormality detection methods can be applied.

According to the present invention, in an electromagnet device for abnormality detection, the pole is mounted facing downward on the abutment formed opposite to the bottom of the base, so that the abutment of the base is aligned with the reference plane of the pole. In addition to being easy to assemble and speeding up the assembly process, the pole uses the abutment of the base as a reference surface.
In addition, since the armature is locked to the bottom of the base, the distance between the armature and the pole can be easily set at a constant position, ensuring reliable operation, and the bottom of the base can be used as a stopper for the armature. Therefore, a stopper mechanism is not particularly required, and the structure can be simplified.

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional views showing one embodiment of the circuit breaker of the present invention, FIG. 3 is an exploded perspective view of the electromagnet device for abnormality detection, and FIGS. 4 and 5 are views of other circuit breakers. FIG. 6 is a longitudinal sectional view of a portion of the embodiment, and FIG. 6 is a perspective view of a portion of FIG. 5. 1... Base, 1a... Bottom part, 11.
...Frame, 19...Opening/closing mechanism, 21
...Magnetic guide section, 23 ... Oil case, 24 ... Plunger, 26 ... Pole, 28 ... Electromagnetic coil, 31 ...・・・・・・
Armature, 34... Electromagnetic device for abnormality detection, 36... Abutment, 41... Drive mechanism, 62... Tripping mechanism.

Claims (1)

[Claims for Utility Model Registration] An opening/closing mechanism, a drive mechanism for driving this opening/closing mechanism, a tripping mechanism for controlling this driving mechanism, an electromagnetic device for abnormality detection that operates this tripping mechanism, and a base. The electromagnetic device for abnormality detection includes a frame fixed to the base and forming a magnetic guide, and a plunger provided inside the frame. an oil case into which the oil case is inserted so as to be able to move up and down, a pole attached to the lower end of the oil case and supported downwardly on the abutment, and a pole attached to the outer periphery of the oil case and interposed in the circuit of the opening/closing mechanism. a circuit breaker, characterized in that it has an armature that is rotatably provided with respect to the pole and that is normally locked to the bottom of the base and that rotates to actuate the tripping mechanism. vessel.