JPH0754912Y2 - Circuit breaker - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to the structure of a circuit breaker trip mechanism that instantaneously cuts off an electric circuit when a short circuit accident occurs in an electric wiring and a large current flows through the circuit breaker.

2. Description of the Related Art Originally, the purpose of a trip mechanism of a circuit breaker is to disengage the movable element from the electric circuit side when a large current flows in the electric circuit to release the engagement with the trip element. Is to cut off instantly. However, when only the attraction element formed of a magnetic material is used as the movable element, the attraction element receives an attraction force on the side opposite to the electric path due to the magnetic field generated in the fixed element when a large current is generated, and the attraction element does not operate instantly. Therefore, the purpose of the circuit breaker cannot be achieved. Therefore, in the past,
As shown in the figure, an attempt has been made to prevent the influence of magnetism generated in the fixed element by caulking a stopper element formed of a non-magnetic material with a suction element by rivets or by spot welding.

[Problems to be solved by the device]

The movable element in the conventional tripping mechanism of the circuit breaker not only has a large number of parts as described above but also requires an assembling step of parts, resulting in high cost in manufacturing. In addition, the rivet caulking and spot welding may be misaligned, and the movable range of the movable element (A in FIG.
There is also a risk that it will change or will be separated. Therefore, when such a movable element is used for the tripping mechanism, it may not operate even if a predetermined current flows, or on the contrary, it may operate at a predetermined current value or less, resulting in poor reliability.

[Means for Solving the Problems]

The present invention was developed as a result of earnest research to solve the above-mentioned conventional problems, and the movable element is made of a clad material formed of an iron material on one side and a copper material on the other side.
We succeeded in unifying the members, reducing the number of parts, and obtaining an accurate movable range. That is, that configuration, a fixed element having an electric path running in one direction, a movable element that is operated by switching between a parallel attitude and a separated attitude with respect to the electric path is pivotally attached, and when a large current flows in the electric path, In the tripping mechanism of a circuit breaker, in which the movable element in the separated posture is pulled toward the electric path, and the trip element in engagement with the movable element operates to cut off the electric path, the movable element formed of a clad material is replaced by an iron material. It is formed by assembling to the fixing element so that the side faces the electric circuit.

[Action]

When a large current flows in the electric circuit, a magnetic field is generated around the electric circuit, and the magnetic material attracts the iron material surface of the movable element to the electric circuit side, and the movement of the movable element causes the tripping element engaged with the movable element to move in a predetermined direction. An operation such as falling is surely performed.

【Example】

FIG. 1 is an explanatory diagram of a movable element used in a trip mechanism according to the present invention, and FIG. 2 is an explanatory diagram of a trip mechanism according to the present invention. Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the drawings. First, as shown in FIG. 1, the movable element 1 is made of a clad material having one side made of iron and the other side made of copper, and a spring 5 is formed on the upper end thereof.
Locking piece 1c that locks, and shafts 1d, 1e and hooking piece 1 on both sides.
f and 1f are integrally formed. As shown in FIG. 2, this movable element pivotally supports shafts 1d and 1e in shaft holes 2a and 2a of the fixed element, respectively, and swings engaging pieces 1f and 1f into notches 2c and 2c, respectively. , And is urged by the spring 5 to the side opposite to the electric path 4. Now, if a short circuit accident occurs in the electric wiring in which the circuit breaker is installed and a large current flows in the electric path 3, a magnetic field due to this large current is generated around the electric path 3 and the magnetic surface of the movable element 1 is generated. 1a is attracted to the electric circuit side by this magnetic field,
1d, 1e in the notch 2c, that is, the movable range,
In accordance with the movement of the movable element 1, the tripping element 6 engaged with the movable element 1 falls in the direction opposite to the electric path 3 and the electric path is cut off. This series of operations must be accurately performed instantaneously when a large current flows, but the movable element of the present invention has a smaller number of parts than the conventional movable element, so the moment of inertia is small and the movable range is constant. However, since it is small and the movable range is constant, fast and accurate operation is possible.

[Effect of device]

The tripping mechanism of the circuit breaker according to the present invention includes the movable element made of the clad material as described above, so that the movable element has only one component and the secondary parts such as riveting and spot welding. Since no processing is required, the manufacturing cost of the circuit breaker can be reduced significantly. Moreover, since each dimension of the movable element is constant, the movable range does not change, and a constant breaking characteristic can always be obtained, which helps improve the reliability of the circuit breaker, and its practical benefit is great.

[Brief description of drawings]

1 is an explanatory view of a movable element in a tripping mechanism of a circuit breaker according to the present invention, FIGS. 2 and 3 are explanatory diagrams of a tripping mechanism of a circuit breaker according to the present invention, and FIG. 4 is a conventional movable FIG. 5 is an explanatory diagram of the element and the fixing element, and FIG. 5 is an explanatory diagram of a conventional tripping mechanism. 1 ... Movable element, 1a ... Iron surface, 1b ... Shaft, 1f ... Engagement piece, 2 ... Fixed element, 2a ... Shaft hole, 2b ... Spring locking piece,
2c …… notch part, 3 …… electric circuit, 4 …… mounting member, 5 ……
Spring, 6 ... Tripping element, 7 ... Stopper element, 8
…… Suction element, 9 …… Rivet, 10 …… Conventional fixing element.

Claims (1)

[Scope of utility model registration request] 1. A fixed element having an electric path that runs in one direction is pivotally attached to a movable element that operates by switching between a parallel attitude and a separated attitude with respect to the electric path, and when a large current flows in the electric path,
In the tripping mechanism of a circuit breaker, in which the movable element in the separated posture is pulled toward the electric path, and the trip element in engagement with the movable element operates to cut off the electric path, the movable element formed of a clad material is replaced by an iron material. Breaker tripping mechanism that is assembled to a fixed element so that its side faces the electric circuit.