JPH09102259A - Overcurrent relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the lock mechanism of an operation mechanism at the time of constituting an overcurrent relay by reforming a breaker for wiring. SOLUTION: In a breaker for wiring, the operation to the power on of an operation mechanism 12 is locked by coupling the lower link 18a of the toggle link 18 coupled with a mobile contact holder to the side frame 13a of an operation mechanism support frame 13. Hereby, the structure becomes simpler than the conventional constitution which locks the operation by fixing a stopper to the mobile contact case and thrusting this to the wall of the case 1, since the parts such as the mobile contact holder, an opening and closing shaft for supporting this are unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overcurrent relay, and more particularly to an overcurrent relay constructed by modifying a wiring breaker.

[0002]

2. Description of the Related Art Conventionally, an overcurrent relay has been manufactured in which a circuit breaker for wiring is modified and an overcurrent signal is obtained by utilizing only its trip operation. By the way, in a circuit breaker for wiring, generally, a movable contact is held by a movable contact holder rotatably supported by a case via an opening / closing shaft, and the movable contact holder is provided with a toggle link of an operating mechanism. It is driven on and off by the operation spring that stores the manual operation force. Here, one link (upper link) of a toggle link composed of two links connected to each other by a pin is always connected to a locked latch, and the other link (lower link) is connected to a movable contact holder. Has been done.

However, the operation spring is stretched between the pin connecting the two links and the handle lever to which the operation handle is attached. When the opening / closing handle is opened / closed, the operation spring for the toggle link is operated. The action of force is reversed, and the movable contact holder is driven on and off. On the other hand, when an overcurrent state occurs, the overcurrent trip device operates and the latch is unlocked, and the rotation of the latch thereby reverses the action of the force of the operating spring on the toggle link, turning off the movable contact. Driven (trip operation). In that case, in the case where the alarm switch for detecting the trip operation is provided, the alarm switch switches the contact in conjunction with the above-mentioned rotation of the latch and sends out a trip signal.

In the case of constructing an overcurrent relay using the above-mentioned wiring breaker, the conducting path to be opened and closed by the movable contact is short-circuited by the conductor, while the operating mechanism is between the off position and the trip position. Bind only operably. When the overcurrent trip device inserted in the energizing path detects an overcurrent state, the latch is unlocked and an overcurrent signal is sent by an alarm switch interlocked with the latch.

FIG. 3 is a vertical cross-sectional view showing a conventional structure of such a conventional overcurrent relay, in which an operating mechanism portion is omitted. In FIG. 3, the movable contact holder 3 is attached to the opening / closing shaft 2 made of an insulator, which is rotatably supported by the case 1, by a grip metal fitting 4. When configured as a circuit breaker for wiring, a movable contact (not shown) is attached to the movable contact holder 3, but in the case of the illustrated overcurrent relay, a stopper metal fitting 5 made of a plate material is fixed by a screw 6. There is. The stopper fitting 5 abuts against the wall 1a of the case 1 when the movable contact holder 3 tries to rotate counterclockwise from the illustrated position (off position), that is, on the closing side, and prevents the rotation.

[0006]

In the case of the overcurrent relay of FIG. 3, which is constructed by modifying the circuit breaker for wiring, it is fixed to the movable contact holder 3 in order to lock the operation of the operating mechanism to the closing side. The stopper fitting 5 is abutted against the wall 1a of the case 1. However, such a structure does not need to be used as an overcurrent relay, but the parts such as the opening / closing shaft 2, the movable contact holder 3, and the gripping metal 4, and the new stopper metal 5,
There is a problem that parts such as the screw 6 are required, and the cost and labor for the modification are high. Therefore, an object of the present invention is to simplify the lock structure of the operating mechanism when the circuit breaker for wiring is modified to form an overcurrent relay.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an operating mechanism having a toggle link including an upper link connected to a latch and a lower link connected to a movable contact holder. It is configured by modifying the provided circuit breaker, the current path to be opened and closed by the movable contactor is short-circuited by the conductor, and the operating mechanism is constrained to be operable only between the off position and the trip position. When the overcurrent trip device inserted in the energization path is activated and the lock of the latch is released, an overcurrent relay that sends an overcurrent signal by an alarm switch interlocked with the latch, in the toggle link, The lower link is connected to the side plate of the supporting frame of the operating mechanism via a pin to lock the operation of the operating mechanism toward the closing side. According to such a means, the lower link of the toggle link is simply connected to the side plate of the support frame with a pin, so that the structure is extremely simple.

[0008]

1 and 2 show an embodiment of the present invention. Here, FIG. 1 is a vertical cross-sectional view of the reset state of the overcurrent relay, and FIG. 2 is a vertical cross-sectional view of the same trip state. In the illustrated overcurrent relay, the movable contactor part of the circuit breaker for wiring is removed, and the fixed contactor conductor 8 integrated with the power supply side terminal 7 and one end of the trip coil 9a of the overcurrent trip device 9 are connected to the lead wire 10. Shorted through. Tripping coil 9
The other end of a is connected to the load side terminal 11.

The operating mechanism 12 is constructed on a support frame 13 made of an iron plate, and the support frame 13 is formed in a U shape having side plates 13a which stand upright and leftward.
It is fixed to the case 1 by screws (not shown). The operating mechanism 12 is well known as an opening / closing operation for a circuit breaker for wiring and a trip operating mechanism. A latch 14 is rotatably supported by a shaft 15 at one end on a side plate 13a, and the other end of the latch 14 is shown in FIG. Latch receiver 1 in reset state
6 is locked and locked. The latch receiver 16 which receives the force from the latch 14 tries to rotate clockwise in the drawing, but the upper end thereof is pressed by the claws of the trip crossbar 17 to maintain the illustrated posture.

The toggle link 18 is composed of an upper link 18a and a lower link 18b connected to each other by a pin 19, and the upper link 18a has a semicircular protruding shaft 14a integrally formed with the latch 14 and a U-shaped notch. Latch 14 by fitting through
It is connected to. A handle lever 20 having a pair of left and right legs bent and formed in an inverted U shape is combined with the outside of the support frame 13, and the handle lever 20 has a semi-finished structure in which the ends of both legs are integrally formed on the side surface of the side plate 13a. The circular protruding shaft 13b is fitted through an arcuate notch and is swingably supported. And the handle lever 2
An operation spring 21 made of a tension coil spring is stretched between the head of 0 and the pin 19 of the toggle link 18,
An operating handle 22 is attached to the head of the handle lever 20. In the state of FIG. 1, the operation spring 21 is stretched and stores energy. Toggle link 18
The lower link 18b is connected to the movable contact holder in the circuit breaker for wiring, but here is connected to the side plate 13a via the pin 23 at a position corresponding to the off position of the movable contact holder. .

In FIG. 1, when the current flowing through the energization path from the terminal 7 to the terminal 11 becomes an overcurrent state, the overcurrent trip device 9 attracts the armature 9b and rotates it in the clockwise direction in the figure. Since the armature 9b pushes the trip crossbar 17 by an operating arm (not shown) to rotate the tripcrossbar 17 in the clockwise direction, the latch receiver 16 is provided in the trip crossbar 1.
It disengages from the claw 7 and rotates clockwise to unlock the latch of the latch 14. As a result, the latch 14, which receives the force of the operation spring 21 via the toggle link 18, rotates in the counterclockwise direction, and its end hits a portion 13c of the support frame 13 and stops. FIG. 2 shows this trip state. Although not shown, an alarm switch made up of a micro switch is installed on the side of the operating mechanism 12,
The latch 14 which has been unlocked and rotated operates the actuator of this alarm switch. As a result, the contact of the alarm switch is switched and the overcurrent signal is sent to the outside.

To reset the operating mechanism from the trip state shown in FIG. 2, the operation handle 22 is operated clockwise.
As a result, the latch 14 is pushed by the hook 20a formed in the upper portion of the handle lever 20 to rotate in the clockwise direction, is locked by the latch receiver 16 again, and is locked in the state of FIG. In the process, the operation spring 21 is stretched and stores energy in preparation for the next trip. Although not shown, the latch receiver 16 and the trip crossbar 17 are provided with return springs, which are torsion springs, and are always biased counterclockwise. In the circuit breaker for wiring in the reset state of FIG. 1, when the operating handle 22 is operated counterclockwise, the toggle link 18, which is bent in a V shape, expands and the movable contact closes. In this case, since the lower link 18b is connected to the side plate 13a, the toggle link 18 does not extend and the operating mechanism 12 is locked on the closing side.

In the above-described embodiment, the operation mechanism 12 is locked to the closing side operation by connecting the lower link 18b to the side plate 13 via the pin 23. That is, the lock can be achieved by using only one pin 23. Compared with the conventional example shown in FIG. 3, parts such as the opening / closing shaft 2, the movable contact holder 3, the grip fitting 4, the stopper fitting 5, and the screw 6 are It is unnecessary, and the number of assembly steps can be reduced accordingly.

[0014]

According to the present invention, the operation of the operating mechanism to the closing side can be locked by a very simple structure in which the lower link of the toggle link is connected to the side plate of the support frame through the pin, and the wiring is shut off. It is possible to construct an overcurrent relay with a modified device at a low cost.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an overcurrent relay in a reset state showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the overcurrent relay of FIG. 1 in a trip state.

FIG. 3 is a longitudinal sectional view of a main part of an overcurrent relay showing a conventional example.

[Explanation of symbols]

 7 terminal 9 overcurrent trip device 10 lead wire 11 terminal 12 operation mechanism 13 support frame 13a side plate 14 latch 16 latch receiver 18 toggle link 18a upper link 18b lower link 20 handle lever 21 operation spring 22 operation handle 23 pin

Claims (1)

[Claims] 1. A movable contactor, which is constructed by modifying a circuit breaker for wiring having an operating mechanism having a toggle link consisting of an upper link connected to a latch and a lower link connected to a movable contact holder. The conducting path to be opened and closed by means of a conductor is short-circuited, and the operating mechanism is constrained to be operable only between the off position and the trip position, and the overcurrent trip device inserted in the conducting path operates. When the latch of the latch is unlocked, an overcurrent relay that sends an overcurrent signal by an alarm switch interlocked with the latch, in which the lower link of the toggle link is pinned to the side plate of the supporting frame of the operating mechanism. An overcurrent relay characterized in that the operation mechanism is locked to the closing side of the operating mechanism.