JPH08255547A - Electromagnetic device for circuit breaker - Google Patents

Abstract

PURPOSE: To eliminate a tripping characteristic dispersion without increasing the number of parts or cost, and stabilize a breaking characteristic by forming an armature stopper on the upper end of a yoke as integral part thereof, and keeping a constant magnetic gap between the yoke and the armature. CONSTITUTION: An armature 7 keeps an inclined posture, due to the force of an energizing spring 8, when no overcurrent flows in a main circuit, and an armature stopper 9 integrated with the upper end of a yoke 3 prevents the lower end of the armature 7 from coming in contact with the side plate 3b of the yoke 3, due to the existence of a magnetic gap A. When overcurrent is generated, current flows across an electromagnetic coil 5, and a stator 6 attracts the armature 7 in a horizontal posture, thereby tripping the main circuit. As a result of providing the stopper 9 to form a constant magnetic gap between the side plate 3b of the yoke 3 and the armature 7, the armature 7 can be properly attracted in a proper time and a tripping dispersion can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic gap provided between a yoke and a movable iron piece for stabilizing tripping characteristics in an electromagnetic device of a circuit breaker.

[0002]

2. Description of the Related Art Generally, in an electromagnetic device of a circuit breaker, it is necessary to provide a magnetic gap between a side plate of a yoke and a movable iron piece facing the side plate so that they do not come into contact with each other. Because without this magnetic gap, the yoke and the movable iron piece made of magnetic material are attracted to each other by the magnetic field due to overcurrent in the main circuit, and the movable iron piece is attracted to the fixed iron piece at the upper end of the oil dash pot. The magnetic gap is indispensable for ensuring that the movable iron piece is attracted to the fixed iron piece at the upper end of the oil dash pot in a proper time in a reliable manner. Regarding this magnetic gap, there is a technique described in Japanese Utility Model Laid-Open No. 63-165745. That is, when the tip of the movable iron piece pivotally attached to the L-shaped yoke is tilted away from the fixed iron piece at the upper end of the oil dash pot, the tip of the movable iron piece comes into contact with the lid of the case of the circuit breaker. A magnetic gap is provided between the iron side plate and the movable iron piece facing the side plate.

Further, as shown in FIGS. 5 and 6, the electromagnetic device 22 of the circuit breaker 21 has an L-shaped yoke 23 composed of a substrate 23a and a side plate 23b, and an exciting function fixed to the yoke 23. Oil dash pot 2 with built-in member
4, an electromagnetic coil 25 wound around the outer periphery of the oil dash pot 24, and a horizontal attitude and a fixed iron piece whose tip is in the vicinity of the upper end of the side plate 23b of the yoke 23 and whose tip contacts the fixed iron piece 26 at the upper end of the oil dash pot 24. 26 includes a movable iron piece 27 pivotally mounted so as to be able to rise and fall between an inclined posture separated from 26, and an urging spring 28 for urging the movable iron piece 27 in the inclination direction. The magnetic material 29 is bonded so that the base end 24a of the movable iron piece 24 abuts on the non-magnetic material 29 when the tip of the movable iron piece 24 is in an inclined posture away from the fixed iron piece 26, thereby forming a magnetic gap. Was provided.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the technology disclosed in Japanese Patent No. 5745, the magnetic gap between the yoke and the movable iron piece is provided by the base of the case of the circuit breaker, the lid, and the yoke. If any one of the iron mounting positions is displaced, the magnetic gap between the yoke and the movable iron piece is changed, and there is a drawback in that the trip characteristics vary. In order to prevent this, it is necessary to improve the dimensional accuracy of the corresponding parts, but this has the drawback of increasing the manufacturing cost.

Further, in the structure shown in FIGS. 5 and 6, in order to join the non-magnetic material 29 to the side plate 23b of the yoke 23,
There is a drawback that the number of parts is increased, the joining work is troublesome, and the manufacturing cost is increased.

[0006]

In view of the above-mentioned problems of the electromagnetic device of the conventional circuit breaker, the present invention provides a circuit breaker with stable breaking characteristics without increasing the number of parts or increasing the manufacturing cost. The purpose of the present invention is to provide an electromagnetic device for a container, the structure of which is an oil dash incorporating an L-shaped yoke made of a substrate and a side plate and a member having an exciting function fixed to the yoke. The pot, an electromagnetic coil wound around the outer periphery of the oil dash pot, and a horizontal position in which the tip of the yoke contacts the fixed iron piece at the upper end of the oil dash pot in the vicinity of the upper end of the side plate of the yoke and is separated from the fixed iron piece. In an electromagnetic device of a circuit breaker, comprising: a movable iron piece pivotally mounted so as to be able to tilt up and down between an inclined posture and an urging spring for urging the movable iron piece in an inclination direction, an upper end portion of a side plate of the yoke. Movable iron piece The provided, when the movable iron piece and the movable iron piece stopper contacts the inclined position, is to provide a magnetic gap between the movable iron piece to the side plates facing and the side plate of the yoke.

Further, in the electromagnetic device of the circuit breaker, the movable iron piece stopper is integrally formed on the upper end portion of the yoke.

[0008]

When the overcurrent is not generated in the main circuit, the movable iron piece maintains the inclined posture by the biasing spring. At this time, the movable iron piece is prevented from contacting the lower end of the movable iron piece with the side plate of the yoke by the magnetic gap by the movable iron piece stopper. When an overcurrent occurs in the main circuit, a current flows through the electromagnetic coil, and the fixed iron piece at the upper end of the oil dash pot attracts the movable iron piece toward the horizontal posture. At this time, the movable iron piece is surely attracted to the fixed iron piece in an appropriate time, and the main circuit is pulled off accordingly.

[0009]

1 and 2 show a first embodiment of an electromagnetic device of a circuit breaker according to the present invention. The present invention will be described below with reference to these drawings.

The electromagnetic device 2 of the circuit breaker 1 has an L-shaped yoke 3 made up of a substrate 3a and a side plate 3b, an oil dash pot 4 fixed to the yoke 3 and having a member having an exciting function. The electromagnetic coil 5 wound around the outer circumference of the oil dash pot 4 and the horizontal position in which the tip of the electromagnetic coil 5 near the upper end of the side plate 3b of the yoke 3 comes into contact with the fixed iron piece 6 at the upper end of the oil dash pot 4 and the fixed iron piece 6. The movable iron piece 7 pivotally attached so as to be able to tilt up and down between the tilted posture and the movable iron piece 7
And a movable iron piece stopper 9 at the upper end of the side plate 3b of the yoke 3, and when the movable iron piece stopper 9 and the movable iron piece 7 come into contact with each other in the inclined posture, The magnetic gap A is provided between the side plate 3b of the yoke 3 and the movable iron piece 7 facing the side plate 3b.

Although not shown in the figure, a plunger made of a magnetic material, a coil spring for urging the plunger toward the bottom of the oil dash pot 4, and an oil having a constant viscosity are supplied from the upper opening of the oil dash pot 4. Housed,
The opening is covered by a fixed iron piece 6.

When no overcurrent is generated in the main circuit, the movable iron piece 7 is kept inclined by the biasing spring 8. At this time, the movable iron piece 7 is prevented by the movable iron piece stopper 9 from contacting the lower end of the movable iron piece with the side plate 3b of the yoke 3 by the magnetic gap A. When an overcurrent occurs in the main circuit, a current flows through the electromagnetic coil 5, and the fixed iron piece 6 at the upper end of the oil dash pot 4 attracts the movable iron piece 7 to the horizontal posture side. At this time, the movable iron piece is surely attracted to the fixed iron piece in an appropriate time, and the main circuit is pulled off accordingly.

The shape of the movable iron piece stopper 9 and the structure for attaching it to the yoke 3 are not limited to those in this embodiment.
Modifications can be made as appropriate without departing from the spirit of the present invention.

3 and 4 show a second embodiment of the electromagnetic device of the circuit breaker according to the present invention. The present invention will be described below with reference to these drawings.

The electromagnetic device 12 of the circuit breaker 11 is a substrate 3a.
L-shaped yoke 3 composed of the side plate 3b and the side plate 3b, an oil dash pot 4 having a member fixed to the yoke 3 and having an exciting function, and an electromagnetic coil 5 wound around the outer periphery of the oil dash pot 4. And the tip of the fixed iron piece 6 at the upper end of the oil dash pot 4 near the upper end of the side plate 3b of the yoke 3.
A movable iron piece 7 pivotally mounted so as to be able to rise and fall between a horizontal posture in which the movable iron piece 7 is in contact with and a tilted posture separated from the fixed iron piece 6, and a biasing spring 8 for biasing the movable iron piece 7 in the tilt direction, The movable iron piece stopper 19 is attached to the upper end of the side plate 3b of the yoke 3.
When the movable iron piece stopper 19 and the movable iron piece 7 contact each other in an inclined posture, a magnetic gap A is provided between the side plate 3b of the yoke 3 and the movable iron piece 7 facing the side plate 3b. It is provided and configured.

Inside the oil dash pot 4, although not shown, a plunger made of a magnetic material, a coil spring for urging the plunger toward the bottom of the oil dash pot 4, and an oil having a constant viscosity from the upper opening. Housed,
The opening is covered with a fixed iron piece 5.

In a state where no overcurrent is generated in the main circuit, the movable iron piece 7 is kept in the inclined posture by the biasing spring 8. At this time, the movable iron piece 7 is prevented by the movable iron piece stopper 9 from contacting the lower end of the movable iron piece with the side plate 3b of the yoke 3 by the magnetic gap A. When an overcurrent occurs in the main circuit, a current flows in the electromagnetic coil 5, and the fixed iron piece 6 at the upper end of the oil dash pot 4 attracts the movable iron piece 7 to the horizontal posture side. At this time, the movable iron piece is surely attracted to the fixed iron piece in an appropriate time, and accordingly the main circuit is pulled out.

The shape of the movable iron piece stopper 19 is not limited to this embodiment, and can be changed as appropriate without departing from the gist of the present invention.

[0019]

The electromagnetic device of the circuit breaker according to the present invention is
An L-shaped yoke made of a substrate and a side plate, an oil dash pot that is fixed to the yoke and has a member having an exciting function, an electromagnetic coil wound around the outer periphery of the oil dash pot, and the yoke. A movable iron piece pivotally mounted in the vicinity of the upper end of the iron side plate so that it can be erected between a horizontal posture in which its tip contacts the fixed iron piece at the upper end of the oil dash pot and an inclined posture separated from the fixed iron piece, and the movable iron piece. In an electromagnetic device of a circuit breaker, comprising an urging spring for urging an iron piece in a tilt direction, a movable iron piece stopper is provided at an upper end portion of a side plate of the yoke, and the movable iron piece stopper and the movable iron piece are in an inclined posture. When a contact is made, a magnetic gap is provided between the side plate of the yoke and the movable iron piece facing the side plate, so that the electromagnetic characteristics of the circuit breaker with stable breaking characteristics can be achieved without increasing the manufacturing cost. There is an effect that it is possible to provide a location.

In the electromagnetic device of the circuit breaker, since the movable iron piece stopper is integrally formed on the upper end portion of the yoke, the breaking characteristic can be improved without increasing the number of parts or the manufacturing cost. There is an effect that it is possible to provide a stable electromagnetic device of a circuit breaker.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment of an electromagnetic device of a circuit breaker according to the present invention.

FIG. 2 is an explanatory perspective view of main parts of FIG.

FIG. 3 is an explanatory view of a second embodiment of the electromagnetic device of the circuit breaker according to the present invention.

FIG. 4 is a perspective view for explaining a main part of FIG.

FIG. 5 is an explanatory view of an embodiment of a conventional electromagnetic device of a circuit breaker.

FIG. 6 is a perspective view of a main part of FIG.

[Explanation of symbols]

1, 11 ... Circuit breaker, 2, 12 ... Electromagnetic device,
3 ... Yoke, 3a ... Substrate, 3b ... Side plate, 4 ...
..Oil dash pots, 5 ... electromagnetic coils, 6 ...
..Fixed iron pieces, 7 ... movable iron pieces, 8 ... biasing springs,
9, 19 ... Movable piece stopper, A ... Magnetic gap.

Claims (2)

[Claims] 1. An L-shaped yoke comprising a substrate and a side plate,
An oil dash pot which is fixed to the yoke and has a member having an exciting function, an electromagnetic coil wound around the outer periphery of the oil dash pot, and a tip of the oil dash near the upper end of the side plate of the yoke. A movable iron piece pivotably attached between a horizontal position in contact with the fixed iron piece at the upper end of the pot and an inclined attitude separated from the fixed iron piece; and a biasing spring for biasing the movable iron piece in the tilt direction. In the electromagnetic device of the circuit breaker, a movable iron piece stopper is provided at an upper end portion of the side plate of the yoke, and when the movable iron piece stopper and the movable iron piece come into contact with each other in an inclined posture, the side plate of the yoke and the side plate are An electromagnetic device for a circuit breaker, characterized in that a magnetic gap is provided between the movable iron piece and the movable iron piece facing each other. 2. The electromagnetic device of the circuit breaker according to claim 1, wherein the movable iron piece stopper is integrally formed on an upper end portion of the yoke in the electromagnetic device of the circuit breaker.