JPH10172410A - Electromagnetic device of circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic device of a circuit breaker which has a stable demounting characteristics. SOLUTION: An electromagnetic device 1 of a circuit breaker comprises following components; a substantially L-shaped yoke 2 having a base part 2a arranged on a base platform of a circuit breaker and a vertical portion 2b formed almost squarely on the base part 2a, an oil dash pot 3 installed almost vertically on the base 2a of the yoke 2, an electromagnetic coil 4 wound around the oil dash pot 3, a substantially L-shaped movable electromagnetic piece 5 having a piece to be attached 5a which is attached to the yoke 2, rotatable around a fulcrum and able to be attached to the top of the oil dash pot 3, and an output piece 5b formed almost at a right angle on the piece to be attached 5a, and a tensile spring 6 loaded between the movable electromagnetic piece 5 and the yoke 2. In the electromagnetic device 1 of the circuit breaker, the tensile spring made of a non-magnetic material is loaded to make contact with the movable electromagnetic piece 5 between the output piece 5b of the movable electromagnetic piece 5 and the vertical portion 2b of the yoke 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an electromagnetic device of a circuit breaker which operates when an excessive current flows in a main circuit due to a short circuit or the like and trips the main circuit.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic device for a circuit breaker has been disclosed in Japanese Utility Model Publication No. 1-36275. In this electromagnetic device, a tension spring is suspended in a space between the yoke and the movable electromagnetic piece.

[0003] Further, there is one such as described in Japanese Utility Model Publication No. Hei 8-2916. In this electromagnetic device, a magnetic gap was provided between an output piece of a movable electromagnetic piece and a yoke.

[0004]

[Problems to be solved by the invention]
The electromagnetic device of the circuit breaker described in JP-A-36275 is
If a magnetic material tension spring is used and the electromagnetic device operates when an excessive current flows in the main circuit due to a short circuit, etc., the output piece of the movable electromagnetic piece comes into contact with the tension spring, and at this time, the yoke that should be formed originally In addition to the magnetic path formed by the movable electromagnetic piece and the oil dash pot, a magnetic path formed by the movable electromagnetic piece and the tension spring is formed, and this magnetic path may adversely affect the tripping characteristic. there were.

Further, the electromagnetic device of the circuit breaker described in Japanese Utility Model Publication No. Hei 8-2916 is formed between the suction piece of the movable electromagnetic piece and the oil dash pot simultaneously with the magnetic gap when the mounting position of the yoke changes. The gaps that change
This change may adversely affect tripping characteristics.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional electromagnetic device for a circuit breaker, the present invention provides an electromagnetic device for a circuit breaker that can obtain a stable tripping characteristic.
A substantially L-shaped yoke having at least a base disposed on the base of the circuit breaker and a vertical portion formed substantially at right angles to the base, and an oil dash pot attached substantially vertically to the base of the yoke. An electromagnetic coil revolved by the oil dash pot; a suction piece pivotally supported by the yoke and rotatable about a pivot stop; An electromagnetic device for a circuit breaker, comprising: a substantially L-shaped movable electromagnetic piece having an output piece formed substantially at right angles to the movable electromagnetic piece; and a tension spring stretched between the movable electromagnetic piece and the yoke. In the above, a tension spring made of a non-magnetic material is stretched between the output piece of the movable electromagnetic piece and a vertical portion of the yoke so as to contact the movable electromagnetic piece.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When an electromagnetic device is operated when an excessive current flows in a main circuit due to a short circuit or the like, a current flows in an electromagnetic coil, and an oil dash pot attracts a suction piece of a movable electromagnetic piece by a magnetic field due to the current. The suction piece rotates around the pivot stop of the yoke, and is sucked by the tip of the oil dash pot against the urging force of the tension spring. At this time, the output piece of the movable electromagnetic piece comes into contact with the extension spring, but since the extension spring is made of a non-magnetic material, only the magnetic path formed by the yoke, the movable electromagnetic piece, and the oil dash pot is formed, and the tension spring is formed. Does not adversely affect the release characteristics.

[0008]

1 and 2 are explanatory views of an embodiment of an electromagnetic device of a circuit breaker according to the present invention. Hereinafter, the present invention will be described with reference to these drawings.

The electromagnetic device 1 of the circuit breaker (not shown)
A substantially L-shaped yoke 2 having a base 2a disposed on a base (not shown) of the circuit breaker, a vertical portion 2b formed substantially perpendicular to the base 2a, and a base 2a of the yoke 2 An oil dash pot 3 which is mounted substantially vertically, an electromagnetic coil 4 which is fitted to the oil dash pot 3, and which is pivotally supported by the yoke 2 and is rotatable about a pivot stop. A substantially L-shaped movable electromagnetic piece 5 having a suction piece 5a capable of being sucked into the portion and an output piece 5b formed substantially at right angles to the suction piece 5a, and being stretched between the movable electromagnetic piece 5 and the yoke 2 And a tension spring 6.

In the electromagnetic device 1 of the circuit breaker, a tension spring made of a non-magnetic material is provided between the output piece 5b of the movable electromagnetic piece 5 and the vertical portion 2b of the yoke 2 so as to contact the movable electromagnetic piece 5. Stretch 6.

When the electromagnetic device 1 operates when an excessive current flows in the main circuit due to a short circuit or the like, a current flows in the electromagnetic coil 4, and the oil dash pot 3 attracts the suction piece 5a of the movable electromagnetic piece 5 by the magnetic field due to the current. . The suction piece 5 a rotates about the pivot stop of the yoke 2, and is sucked by the tip of the oil dash pot 3 against the urging force of the tension spring 6. At this time, the output piece 5b of the movable electromagnetic piece 5 comes into contact with the tension spring 6, but since the tension spring 6 is made of a non-magnetic material, only the magnetic path formed by the yoke, the movable electromagnetic piece, and the oil dash pot is provided. Formed and do not adversely affect tripping properties.

[0012]

The electromagnetic device of the circuit breaker according to the present invention comprises:
A substantially L-shaped yoke having at least a base disposed on the base of the circuit breaker and a vertical portion formed substantially at right angles to the base, and an oil dash pot attached substantially vertically to the base of the yoke. An electromagnetic coil revolved by the oil dash pot; a suction piece pivotally supported by the yoke and rotatable about a pivot stop; An electromagnetic device for a circuit breaker, comprising: a substantially L-shaped movable electromagnetic piece having an output piece formed substantially at right angles to the movable electromagnetic piece; and a tension spring stretched between the movable electromagnetic piece and the yoke. In the above, a tension spring made of a non-magnetic material is stretched between the output piece of the movable electromagnetic piece and the vertical portion of the yoke so as to contact the movable electromagnetic piece. The magnetic gap between the piece and the vertical part of the yoke and the attracting piece of the movable electromagnetic piece Yl gap between the tip of the dashpot is constant, there is an effect that stable tripping characteristics can be obtained.

[Brief description of the drawings]

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

FIG. 2 is an explanatory perspective view of a main part of an electromagnetic device of the circuit breaker according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic device, 2 ... Yoke, 3 ... Oil dash pot, 4 ... Electromagnetic coil, 5 ... Movable electromagnetic piece, 6 ... Tension spring.

Claims (1)

[Claims] 1. A substantially L-shaped yoke having at least a base disposed on a base of a circuit breaker and a vertical portion formed substantially at right angles to the base, and attached substantially vertically to a base of the yoke. An oil dash pot, an electromagnetic coil revolved by the oil dash pot, and a suction pivotally supported by the yoke, rotatable about a pivot stop, and capable of being sucked into the tip of the oil dash pot. A circuit comprising a substantially L-shaped movable electromagnetic piece having a piece and an output piece formed substantially at right angles to the suction piece, and a tension spring stretched between the movable electromagnetic piece and the yoke. In the electromagnetic device of a circuit breaker, a tension spring made of a nonmagnetic material is stretched between the output piece of the movable electromagnetic piece and a vertical portion of the yoke so as to contact the movable electromagnetic piece. The circuit breaker electromagnetic device.