KR960005896Y1 - Circuit breaker - Google Patents

Abstract

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Description

Low voltage circuit breaker

1 is a main configuration diagram showing an example of a conventional low-voltage circuit breaker

2 is a cross-sectional view showing the operating state of the low-voltage circuit breaker according to the configuration of the present invention

(a) is a state diagram when the

(b) is a state diagram during the acting current

* Explanation of symbols for main parts of the drawings

5: lower link 6: holder

9: shaft 12: pin

13: limiting spring 14: auxiliary spring

22: limit latch

The present invention relates to a structure of a low voltage circuit breaker, and more particularly, to a low voltage circuit breaker that can block a high speed by increasing the breaking capacity in a current-limiting circuit breaker.

As shown in FIG. 1, a conventional low voltage circuit breaker has a fixed contactor 8, a holder 6 connected to the movable contactor 7, and an opening 15 formed in the holder 6, as shown in FIG. A lower link 5 connected to each other, an upper link 4 connected to one end of the lower link 5 and the latch 2, a latch holder 3 restraining the latch 2, and an upper and lower link. It consists of a main spring 20 provided between the connecting shaft of (4, 5) and the upper end of the lever (1), and a contact spring (21) provided between the movable contactor (7) and the holder (6).

The operation of the conventional low voltage circuit breaker configured as described above is as follows.

When a short-circuit current occurs, an electromagnetic repulsion force between the movable contactor 7 and the fixed contactor 8 is generated so that the contact spring 21 has a larger electromagnetic repulsion force than the force holding the movable contactor 7. Rotate clockwise to block the track primarily.

However, as described above, the conventional low voltage circuit breaker interrupts the line only by the electromagnetic repulsive force during the actuation of the current, so the arc break time is considerably low and the reliability of the circuit breaker is low.

The present invention is to solve the above-mentioned disadvantages, install a limit spring between the holder and the holder axis of rotation to press the movable contactor in the on state to improve the reliability of the power supply and the movable contactor is constrained during the current flow When released in the direction of the limit spring force is reversed to be configured to accelerate the opening of the movable contact bar to explain the present invention with reference to the accompanying drawings 2 as follows.

The main configuration of the present invention, the pin 9 is fitted into the shaft 9 and the opening 15 coupled to the lower link 5 and the limit latch 22, the limit latch is integrally mounted to the shaft ( 22), the lower link 5 provided between the limit latch 22 and the shaft 9, the limit spring 13 provided between the pin 12 and the holder 6, and It consists of an auxiliary spring (14) connected to one end of the limit latch 22 and the tip of the holder (6).

The connection research for this is as follows.

The movable contactor 7 is mounted on the holder 6, and thus the connection of the movable contactor 7 and the holder 6 is connected to the limit latch 22, and the limit latch 22 is a shaft formed by a mold ( 9), a pin 12 is mounted between the opening 6 formed in the holder 6 and the limit stretch 22, and between the pin 12 and the shaft 9 and the limit stretch 22 The limit spring 13 is connected between the connecting pins 11.

In addition, an auxiliary spring 14 is installed between the upper end of the holder 6 and one end of the limit latch 22, and a lower link 5 is installed between the shaft 9 and the limit latch 22.

At this time, the shaft 9 and the limit latch 22 are integrally formed.

The circuit breaker according to the present invention configured as described above has a force that the limit spring 13 pushes the movable contact 7 when an electromagnetic repulsive force is generated between the fixed contact 8 and the movable contact 7 when a short circuit current occurs. The electromagnetic repulsive force becomes larger than that, and the movable contact 7 is lifted by the electromagnetic repulsive force.

At this time, the elastic force of the limit spring 13 is reversed.

That is, at the time of turning on, the movable contact 7 is pressed against the direction of the elastic force in the counterclockwise direction. However, during the current-limiting action, the movable contact 7 is released from the restraint of the holder 6 by the pin 12. As 12) moves to the upper position in the opening 12 as shown in FIG. 2 (b), the limit spring 13 force acts clockwise, i.e., in the pulling direction, so that the movable contact 7 can be more quickly Away from the stationary contact (8).

In addition, when the movable contactor 7 is lifted, the auxiliary spring 14 also pulls the holder 6 to further accelerate the opening and closing of the movable contactor 7.

At this time, the limit latch 22 is supported by the upper link 4 and the lower link 5 by the force of the main spring 20, and during the current-limiting action, the limit stretch 22 and the shaft 9 mounted integrally therewith. Will not move.

According to the construction and operation of the present invention as described above, when the movable spring 7 is turned on by the limit spring 13, the reliability of energization is improved, and the movable contact 7 is the holder 6 during the current-limiting action. The force of the limit spring 13 is reversed to reverse the speed of the movable contactor, and the auxiliary spring 14 further accelerates the opening of the movable contactor 7 to maximize the opening speed of the current. .

In other words, it is possible to reduce the occurrence of arc inside by increasing the speed of the current-limiting opening, thereby increasing the breaking capacity and improving the reliability and durability of the breaker.

Claims (1)

(Correction) in the internal structure of a low-voltage circuit breaker for current-limiting operation, A shaft 9 engaged with the lower link 5 and the limit stretch 22; A limit latch 22 fitted with a pin 12 in the opening 15 and integrally mounted to the shaft 9; A lower link 5 installed between the limit latch 22 and the shaft 9, A limit spring 13 installed between the pin 12 and the holder 6, and Low-circuit circuit breaker, characterized in that it comprises an auxiliary spring (14) connected to one end of the limit latch (22) and the front end of the holder (6).