JP4401810B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a single-phase two-wire circuit breaker.

  As shown in FIGS. 5 and 6, the single-phase two-wire circuit breaker 21 includes a fixed contact 24 having one end connected to the power supply side terminal 22 and a fixed contact 23 at the other end, and a fixed contact 24. A movable contact 26 that has a movable contact 25 that contacts and separates from the fixed contact 23 at one end and rotates with a support shaft 26a provided at the other end, and a flexible electric wire 27 that is connected to the movable contact 26. The electric circuit of the voltage electrode is connected by the overcurrent tripping device 30 connected to the flexible wire 27, the conductive plate 28 connected to the overcurrent tripping device 30, and the load side terminal 29 connected to the conductive plate 28. The non-voltage electrode circuit is configured by components excluding the overcurrent tripping device 30 from the voltage electrode components.

  When a short circuit current flows in the electric circuit, the overcurrent tripping device 30 is driven to interrupt the electric circuit. At this time, at the voltage electrode, the power source side terminal 22 → the fixed contact 24 → the fixed contact 23 → the movable contact 25 → the movable contact 26 → the flexible electric wire 27 → the overcurrent tripping device 30 → the conductive plate 28 → the load side terminal 29. Current flows sequentially, and current flows in the opposite direction at the non-voltage pole.

7 and 8 show the direction of the current flowing through the flexible wire 27, the movable contact 26, the arc, and the fixed contact 24 and the generation state of the magnetic flux in order from the left for the voltage electrode and the non-voltage electrode. As can be seen from this figure, the voltage electrode is quickly shut off due to repulsion of the fixed contact 24 and the movable contact 26, but the non-voltage pole is not quickly shut off due to the suction of the fixed contact 24 and the movable contact 26. In addition, since the electromagnetic force of the voltage pole arc works downward, it is easy to guide the arc to the arc extinguishing chamber 32 disposed on the lower side of the conductive plate 28. Since it works in the direction, it causes a drop in the shut-off performance. Therefore, a magnetic shielding plate is disposed between the stationary contact and the arc extinguishing device, or movable contacts are provided at both ends of the movable contact so as to improve the breaking performance by using a two-point cutting method (for example, Patent Documents). 1).
JP 2003-123612 A (FIG. 1)

  As described above, the conventional circuit breaker requires a special part such as a magnetic shielding plate, or requires special processing on the movable contact, which is expensive.

The present invention, the other end has at one end a fixed contact, one end having a fixed contact on is connected to the power source side terminal and the other end, a fixed contact and horizontally toward and away from the movable contacts of the fixed contactor as the lower A movable contact that rotates with the support shaft provided on the upper side, a flexible electric wire connected to the proximal end of the movable contact, a conductive plate connected to the flexible electric wire, and a conductive plate In the single-phase, two-wire circuit breaker, in which a voltage electrode circuit and a non-voltage electrode circuit are formed with the load side terminal, and both circuits are incorporated in the circuit breaker case, the non-voltage electrode movable contact is the voltage electrode the contact position of the short form and a non-voltage electrode than the movable contact in the contact position and the height position of the voltage polarity different, occurring path of non-voltage poles when the short-circuit current flows in the path arc The upward electromagnetic force acting on the current is weakened by the downward electromagnetic force acting on the arc generated in the voltage pole circuit. As well as, the fixed contact of the non-voltage electrode forming a fall portion extending from the fixed contact to the vicinity of the bottom of the circuit breaker case between the fixed contact and the power supply side terminal, the height position of the conductive plate of the non-voltage electrode The height of the flexible contact is made larger than the height of the movable contact so that the electromagnetic force generated around the movable contact of the non-voltage pole repels the electromagnetic force generated at the fixed contact . It is characterized by that.

  The circuit breaker of the present invention has an effect that the breaking performance can be enhanced without requiring special parts and special processing and without cost.

A fixed contact having one end connected to the power supply side terminal and having a fixed contact at the other end, and a movable contact that contacts and separates horizontally from the fixed contact of the fixed contact at the lower end is provided at the other end. A movable contact that rotates with the support shaft on the upper side, a flexible wire connected to the base end of the movable contact, a conductive plate connected to the flexible wire, and a load-side terminal connected to the conductive plate In the single-phase two-wire circuit breaker, in which the voltage pole circuit and the non-voltage pole circuit are configured in the circuit breaker case, the non-voltage pole movable contact is the voltage pole movable contact. The height of the contact position of the non-voltage electrode and the contact position of the voltage electrode are different from each other, and when the short-circuit current flows in the circuit, the upward direction acting on the arc generated in the circuit of the non-voltage electrode The electromagnetic force is weakened by the downward electromagnetic force acting on the arc generated in the voltage pole circuit . The non-voltage electrode fixed contact forms a falling portion extending from the fixed contact to the vicinity of the bottom of the circuit breaker case between the fixed contact and the power supply side terminal, and conducts the non-voltage electrode connected to the load side terminal. The height position of the plate is made lower than the height position of the movable contact, the rise of the flexible wire connecting the conductive plate and the movable contact is increased, and the electromagnetic force generated around the movable contact of the non-voltage pole is reduced. Repel the electromagnetic force generated in the stationary contact .

  An embodiment of a circuit breaker according to the present invention will be described with reference to the accompanying drawings of FIGS.

The non-voltage electrode circuit of the single-phase two-wire circuit breaker 1 includes a fixed contact 4 having one end connected to the power supply side terminal 2 and the other end having a fixed contact 3, and a fixed contact 3 of the fixed contact 4. A movable contact 6 that horizontally contacts and separates from the lower side, and a movable contact 6 that pivots in a pendulum manner with a support shaft 6a provided at the other end on the upper side, and a base end of the movable contact 6 The flexible wire 7 is connected to the conductive wire 8, the conductive plate 8 is connected to the flexible wire 7, and the load-side terminal 9 is connected to the conductive plate 8. The electric circuit of the voltage electrode has the same configuration as the non-voltage electrode except that an overcurrent tripping device 10 is connected between the flexible wire 7 and the conductive plate 8.

The non-voltage electrodes are arranged at both ends of the circuit breaker case 11 in which the power supply side terminal 2 and the load side terminal 9 are formed of synthetic resin, and the conductive plate 8 is bent downward from the load side terminal 9 and then horizontally. The horizontal portion 8a is bent at a position lower than the height of the movable contact in the circuit breaker case 11, and the end of the horizontal portion 8a is bent upward and raised, One end of the electric wire 7 is connected. The other end of the flexible electric wire 7 is connected to the other end of the movable contact 6, and the flexible electric wire 7 is largely raised. The fixed contact 4 is formed with a falling portion 4a extending from the fixed contact 3 to the vicinity of the bottom of the circuit breaker case 11, folded back in a U-shape near the bottom of the circuit breaker case 11, and formed to rise from there. Connected to terminal 2. The non-voltage pole movable contact is formed shorter than the voltage pole movable contact so that the contact position of the non-voltage pole is different from the contact position of the voltage pole. An arc extinguishing chamber 12 is disposed below the conductive plate 8.

  In the circuit breaker 1, the overcurrent tripping device 10 is driven by a short-circuit current to cut off the electric circuit. At this time, the load terminal 9 → the conductive plate 8 → the flexible wire 7 → the movable contact 6 is connected to the non-voltage pole. The current flows in the order of the movable contact 5 → the fixed contact 3 → the fixed contact 4 → the power supply side terminal 2.

  3 and 4 show the direction of current flowing through the flexible wire 7, the movable contact 6, the arc, and the fixed contact 4 in order from the left and the generation state of magnetic flux between the non-voltage pole and the voltage pole. Here, the upward current flowing through the flexible electric wire 7 of the non-voltage electrode is longer by adding up the rising portion at the tip of the conductive plate 8, and is superior to the downward current flowing through the movable contact 6. Around these, a magnetic flux repelling with the stationary contact 4 is generated and is quickly cut off. Further, since the voltage electrode has the same structure as the conventional one, the fixed contact 4 and the movable contact 6 are similarly repelled and quickly cut off. Further, when the height position of the contact point between the voltage electrode and the non-voltage electrode is different, the upward electromagnetic force acting on the arc of the non-voltage electrode is weakened by the downward electromagnetic force acting on the voltage electrode, and the arc is extinguished to the arc extinguishing device 12. Since it is easy to be guided, the shut-off performance is improved.

It is a longitudinal cross-sectional view which shows the electric circuit of the non-voltage pole of the circuit breaker which concerns on this invention. It is a longitudinal cross-sectional view which shows the electric circuit of the voltage pole of the circuit breaker which concerns on this invention. It is explanatory drawing which shows the generation | occurrence | production state of the electric current and magnetic flux which flow through the flexible wire of the non-voltage pole of the circuit breaker which concerns on this invention, a movable contact, an arc, and a stationary contact. It is explanatory drawing which shows the generation | occurrence | production state of the electric current and magnetic flux which flow through the flexible wire of the voltage pole of the circuit breaker which concerns on this invention, a movable contact, an arc, and a stationary contact. It is a longitudinal cross-sectional view which shows the electric circuit of the voltage pole of the conventional circuit breaker. It is a longitudinal cross-sectional view which shows the electric circuit of the non-voltage pole of the conventional circuit breaker. It is explanatory drawing which shows the generation | occurrence | production state of the electric current and magnetic flux which flow through the flexible wire of the voltage pole of a conventional circuit breaker, a movable contact, an arc, and a fixed contact. It is explanatory drawing which shows the generation | occurrence | production state of the electric current and magnetic flux which flow through the flexible wire of the non-voltage pole of a conventional circuit breaker, a movable contact, an arc, and a fixed contact.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Power supply side terminal 3 Fixed contact 4 Fixed contact 5 Moveable contact 6 Moveable contact 7 Flexible electric wire 8 Conductive plate 9 Load side terminal

Claims (1)

A stationary contactor having a stationary contact to the other end is connected to the power source side terminal, provided on the other end has a fixed contact and horizontally toward and away from the movable contact of the fixed contacts on one end as the lower A movable contact that rotates with the support shaft facing upward, a flexible wire connected to the base end of the movable contact, a conductive plate connected to the flexible wire, and a conductive plate connected to the conductive plate constitute the circuit of the path and non-voltage pole of the voltage polarity at the load side terminal, in a single-phase two-wire circuit breaker comprising incorporating said two paths in the circuit breaker case, the movable contact of the non-voltage poles The voltage electrode is formed shorter than the movable contact so that the contact position of the non-voltage electrode is different from the contact position of the voltage electrode and the height position, and when the short-circuit current flows in the circuit, the circuit of the non-voltage electrode The upward electromagnetic force acting on the arc generated in the arc and the downward electromagnetic force acting on the arc generated in the voltage pole circuit Thereby to weaken magnetic force, the fixed contact of the non-voltage electrode forming a fall portion extending from the fixed contact between the power source side terminal and the fixed contact to the vicinity of the bottom of the breaker case, non The height of the conductive plate of the voltage electrode is made lower than the height of the movable contact to increase the rise of the flexible wire, and the electromagnetic force generated around the movable contact of the non-voltage electrode is the fixed contact. Circuit breaker characterized by repulsion against electromagnetic force generated in the child .

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