JP4191833B2 - Circuit breaker - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a circuit breaker, and more particularly to a circuit breaker having an electromagnetic tripping element.
[0002]
[Prior art]
Conventionally, a circuit breaker having such an electromagnetic tripping element is necessary for tripping the amount of rotation of the interlocking member that is attracted by the electromagnetic coil and the engagement of the tripping member that engages the open / close mechanism of the breaker. The contact position between the interlocking member and the tripping member is determined by the relationship of the amount of rotation. Both the interlocking member and the tripping member determine the amount of rotation and force at the contact position depending on the distance from the center of rotation. In general, it is designed so that the amount of rotation is in contact with a position having a sufficient margin for releasing the engagement of the opening / closing mechanism. An example is shown in FIG. When a current flows through the electromagnetic coil 4, a magnetic circuit is formed on the magnetic member 3 around the electromagnetic coil 4. When the current exceeds a set value, the one end of the interlocking member 2 pushes the tripping member 5 by the attraction force of the formed magnetic circuit, and the engagement of the opening / closing mechanism portion 1 is tripped to open. Therefore, the number of turns of the electromagnetic coil has been set in order to obtain an attractive force necessary for opening the opening / closing mechanism.
[0003]
[Problems to be solved by the invention]
In a circuit breaker having an electromagnetic trip element, the number of turns of the electromagnetic coil is set according to the relationship between the amount of rotation of the interlocking member that is interlocked with the suction operation by the electromagnetic coil and the tripping member that engages with the mechanical part of the breaker. Therefore, there is a problem that the electromagnetic coil cannot be further reduced in size.
[0004]
Accordingly, the object of the present invention is to reduce the number of turns of the electromagnetic coil, to reduce the size, to efficiently transmit the attractive force to the tripping member of the opening / closing mechanism, and to release the engagement and open the contact. It is intended to provide a circuit breaker.
[0005]
[Means for solving problems]
In order to achieve the above object, in the present invention, an electromagnetic coil is provided in a circuit breaker that can be manually opened and closed and can open a contact that is linked to the opening and closing mechanism even in a manually closed state by releasing the engagement. And a tripping member that engages with the opening / closing mechanism of the circuit breaker has a first contact portion and a second contact portion so as to contact the interlocking member in two stages. The first abutting portion is provided at a position farther from the rotation center of the tripping member than the second abutting portion, and the first abutting portion is rotated by a certain amount by the interlocking member, and then the second abutting portion is provided. It has a tripping member provided with a two-stage abutting part that pivots the abutting part to disengage the engagement of the switching mechanism part of the circuit breaker.
[0006]
[Action]
According to the present invention, it is possible to reduce the size by reducing the number of turns of the electromagnetic coil, and it is possible to obtain a circuit breaker capable of efficiently transmitting the attractive force to the tripping member, tripping the engagement, and opening the contact.
[0007]
[Explanation of Examples]
Hereinafter, the present invention will be described in detail with reference to the drawings.
[0008]
FIG. 2 shows an embodiment of the circuit breaker according to the present invention. 9 is an electromagnetic coil, 6 is an opening / closing mechanism, and 8 is a magnetic member. Reference numeral 7 denotes an interlocking member that interlocks with a suction operation by an electromagnetic coil and is made of a magnetic material. When the interlocking member 7 is rotated, the interlocking member 7 comes into contact with a tripping member described later.
[0009]
2 to 4, reference numeral 10 denotes a tripping member that engages with the opening / closing mechanism 6 of the circuit breaker. By breaking this engagement, the circuit breaker can be opened. The tripping member 10 is provided with a first abutting portion 11 and a second abutting portion 12 that abut against the interlocking member 7, and the longer the distance from the rotation center 16 of the tripping member 10, the first abutting portion. The shorter part 11 is the second contact part 12. And when it sees from the rotation center 17 of the interlocking member 7, the one where a distance is short becomes a 1st contact part, and the one where a distance is long becomes a 2nd contact part. At the position where the interlocking member 7 is in contact with the first contact portion 11, the magnetic force L4 between the interlocking member 7 and the electromagnetic coil 9 is large, so that the attractive force is weak. At the position where the interlocking member 7 is in contact with the second contact portion 12, the interlocking member 7. Since the magnetic gap L4 of the electromagnetic coil 9 is small, the attractive force is increased.
[0010]
When a current flows through the electromagnetic coil 9, a magnetic circuit is formed in the magnetic member 8 around the electromagnetic coil 9. When a current equal to or greater than a set value flows through the electromagnetic coil 9, the interlocking member 7 is rotated by the attractive force of the electromagnetic coil 9, and one end contacts the first contact portion 11 of the tripping member 10. An example is shown in FIG. At this stage, since the tripping member 10 is pushed by the interlocking member 7 at a position far from the rotation center 16, it can be rotated with a light force, and when the interlocking member 7 side is viewed from the rotation center 17, the electromagnetic coil Since the length L2 extending to the first contact portion 11 is shorter than the length L1 extending to the suction portion 9, the force that the interlocking member 7 rotates the tripping member 10 is L1 / L2. Even if the magnetic gap L4 is large and the attractive force is weak, the tripping member 10 can be rotated.
[0011]
Next, as the interlocking member 7 rotates, the contact position between the interlocking member 7 and the tripping member 10 changes from the first contact portion 11 to the second contact portion 12. An example is shown in FIG. At this stage, the tripping member 10 is pushed by the interlocking member 7 at a position close to the rotation center 16, and requires a stronger force than when the first contact portion 11 is pressed. , The length L3 extending to the second abutting portion 12 is longer than the length L1 extending to the suction portion of the electromagnetic coil 9, and the interlocking member 7 is tripped. However, since the magnetic gap L4 is small, a very strong attractive force is generated in the interlocking member 7, and the tripping member 10 continues to rotate. Further, the rotation amount of the tripping member 10 is relatively large with respect to the rotation amount of the interlocking member 7.
[0012]
That is, when the attractive force of the interlocking member 7 by the electromagnetic coil 9 is weak at the contact portion between the interlocking member 7 and the tripping member 10, the moment of the tripping member 10 is at a position where the force due to the moment of the interlocking member 7 is strong. The position where the force by is pushed lightly, and the position where the force due to the moment of the tripping member 10 is strong when the attracting force of the interlocking member 7 by the electromagnetic coil 9 is strong, pushes the position where the force of the electromagnetic coil 9 is attracted. Effectively communicated to. Therefore, in the case of a circuit breaker having a conventional electromagnetic trip element, there is no surplus in the attractive force for tripping the trip member, and even if the number of turns of the electromagnetic coil has to be increased, the number of turns of the electromagnetic coil can be increased without increasing the number of turns. The engagement of the opening / closing mechanism can be efficiently removed.
[0013]
【The invention's effect】
As described above, according to the first aspect of the present invention, the electromagnetic coil can be reduced in size, and the attractive force is efficiently transmitted to the tripping member that engages with the opening / closing mechanism of the circuit breaker, and the engagement is tripped and opened / closed. A circuit breaker that can open the mechanism is obtained.
[Brief description of the drawings]
FIG. 1 shows an example of a conventional circuit breaker having an electromagnetic tripping element. FIG. 2 shows an example of a circuit breaker according to the present invention. FIG. 3 shows an example of tripping operation.
FIG. 4 Example 2 of tripping operation
[Explanation of symbols]
1 Opening / closing mechanism part A
2 Interlocking member A
3 Magnetic member A
4 Electromagnetic coil A
5 Tripping member A
6 Opening and closing mechanism B
7 Interlocking member B
8 Magnetic member B
9 Electromagnetic coil B
10 Tripping member B
DESCRIPTION OF SYMBOLS 11 1st contact part 12 2nd contact part 13 Terminal board 14 Fixed contact 15 Movable contact 16 Rotation center 17 of a tripping member Rotation center of an interlocking member

Claims (1)

A circuit breaker that can be manually opened and closed, and that can be opened by opening the contact that is linked to the opening and closing mechanism even in the manual closed state by pulling off the engagement. The tripping member that engages with the open / close mechanism of the circuit breaker has a first contact portion and a second contact portion so as to contact the interlocking member in two stages, and the first contact portion is a first contact portion. 2 provided at a position farther from the center of rotation of the tripping member than the abutting portion, and the interlocking member rotates the first abutting portion by a certain amount, and then the second abutting portion is rotated to A circuit breaker having a tripping member provided with a two-stage abutting portion for releasing the engagement of the opening / closing mechanism.

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