CN1577689A - External operating handle device for circuit breaker - Google Patents

Abstract

The invention provides an external operating handle device of a circuit breaker, which is an external operating handle device with an isolation function that prevents the operating handle from returning to the disconnected position in an abnormal state where the main contact point of the circuit breaker is melted. In the external operating handle device that switches on and off the circuit breaker equipped with a rocker handle in the panel from outside the panel, in the driving mechanism (11) assembled on its body, there is a constraint locking part, so that In the abnormal state where the main contact point of the circuit breaker is melted, the operating handle cannot be moved to the disconnected position. As its locking part, the connection between the rotating base (18) connected to the operating handle and the rocker handle of the circuit breaker On the sliding base (19), a locking lever (20) facing the crank pin (18a), a return spring (21), a pushing part (19a) and a connecting spring (19b) for pressing the rocker handle to the disconnecting direction are provided. , especially opposite to the claw part (20b) of the locking lever, a stopper (12a) is provided on the body side.

Description

External Operating Handle Units for Circuit Breakers

technical field

The present invention relates to an external operating handle device for turning on and off a circuit breaker equipped on a low-voltage switchboard, a control panel, etc. from outside the panel.

Background technique

In order to turn on and off the circuit breaker (such as automatic circuit breaker) equipped on the low-voltage switchboard and control panel from the outside, it is an external operating handle device as an accessory device (optional part) used in combination with the circuit breaker is well known (see, for example, Patent Document 1).

Here, the structure of the above-mentioned circuit breaker is shown in FIG. 4 (see, for example, Patent Document 2), and an external operating handle device used in combination with the circuit breaker is shown in FIGS. 5(a) and (b).

In Fig. 4, the circuit breaker 1 is composed of main circuit terminals 3, 4 on the power side and load side assembled in the housing 2, fixed contacts 5, movable contacts 6, switching mechanism 7, overcurrent tripping device 8 and The rocker handle 9 used for switch operation is composed, and the rocker handle 9 is switched between the "on" and "off" positions by hand, and the switch mechanism 7 linked with it receives the stored elastic force of the switch spring 10, Carry out the reverse action to make the main contact reverse to closed pole or open pole.

In addition, in Fig. 5 (a), (b), the external operating handle device 11 is equipped with a rotary handle 13 on the body 12 that is combined (fixed with screws) with the housing of the above-mentioned circuit breaker 1 and The handle 13 and the rocker handle 9 (referring to Fig. 4) of the circuit breaker are connected with the following drive mechanism to form the operation handle 13 in the display position of "on" and "off", so that The rocker handle of the circuit breaker can be driven between the "on" and "off" positions. 14 is a display panel showing the positions of the operating handle 13 in "on", "off", "tripping" and "reset", 15 is a draw-out lock plate arranged on the operating handle 13, and 16 is a lock As for the tumbler lock in which the plate 15 is locked in the closed position, the locking mechanism including the operation handle 13 of the lock plate 15 and the sequence of locking operations are described in detail in the above-mentioned Patent Document 1.

Above-mentioned driving mechanism has combined the rotating base that is equipped with the crank pin that is connected on the operating handle 13 and the sliding base that is connected on the crank pin of rotating base and moves along the linear direction, so this sliding base and the rocker arm handle of circuit breaker correspond to each other. Hanging, transforming the rotation of the operating handle into linear motion, driving the rocker handle in the on and off positions.

Patent Document 1

Japanese Patent Laid-Open Publication No. 5-225864

Patent Document 2

Japanese Patent Application Publication No. 10-27534

However, in the use state of the external operating handle device combined with the above-mentioned structure in the circuit breaker shown in FIG. Misoperation as described below.

That is to say, in the circuit breaker shown in Fig. 4, in the event of a fault and excessive current flows in the main circuit, if the circuit breaker does not trip, the main contact points will be damaged due to the gap between the contact points. Contact resistance heats up and melts, causing an abnormal situation to occur. In such a melting state of the contact point, even if the rocker handle is closed, the main contact point will be melted and cannot be opened, so the rocker handle cannot be pushed with normal operating force. However, when combined with the external operating handle unit for the closing operation, the main contact point of the circuit breaker remains molten, and the operating handle of the external operating handle unit is in a position showing disconnection, which is a problem.

That is to say, in the existing external operating handle device, when the driving mechanism of the combination of the rotating base and the sliding base on which the crank pin is installed as described above operates as a force multiplier, the force applied to the operating handle increases, acting on Magnified circuit breaker rocker handle. Therefore, in the state where the contact point is melted, when a force is applied to the operating handle of the external operating handle device to return to the off position, the movable part (movable contact) of the switch mechanism connected to the rocker handle is deformed to make the operation Handle returns to the position that shows disconnection, can as shown in Figure 5, the pin lock 16 that draws out by operating handle 13 locks the lock plate on this disconnection position.

However, although the main contact point of the circuit breaker melts to close the electrodes in this state, the operating handle 13 of the external operating handle device still shows the open position (refer to FIG. 5 ). For this reason, maintenance personnel mistakenly believe that the circuit breaker has been broken by the disconnection shown by the external operating handle device, so there is a risk of electric shock on the circuit of the secondary side (load side) of the circuit breaker.

Therefore, in order to prevent such electric shock accidents, the rocker handle itself of the circuit breaker is mechanically locked in the on position when the main contact point of the circuit breaker is in a molten state to perform the disconnection operation, giving it The function of isolation cannot be moved to the disconnected position, but such a circuit breaker has a complicated structure of the switch mechanism, and the cost is high.

In view of the above points, the purpose of the present invention is to provide an external operating handle device with an isolation function for an external operating handle device assembled in a common circuit breaker without an isolation function. In the abnormal state of point melting, the operating handle cannot return to the off position, which improves safety.

Contents of the invention

In order to achieve the above-mentioned purpose, according to the present invention, the device can switch on and off the circuit breaker equipped with a rocker handle in the panel from outside the panel. The handle device consists of a body combined with the circuit breaker itself. ; a rotary operating handle arranged in front of the body; and an assembly of a driving mechanism that combines a rotating base with a crank pin and a sliding base to convert the rotation of the operating handle into a linear motion, and the sliding base and the circuit The rocker handles of the circuit breaker are hooked together, and the rocker handle is driven to the on and off positions.

In the drive mechanism, a lock member is provided that locks the handle so that it cannot move toward the off position in an abnormal state where the main contact point of the circuit breaker is melted.

(1) As a locking member, a locking lever that faces the crank pin of the rotating base in the breaking direction on the sliding base of the drive mechanism, and a return spring that presses the locking lever to the normal position are provided, and at the same time on the main body side There is also a limiter, which can engage with the locking lever tilted against the return spring to prevent the sliding lever from moving in the disconnecting direction by using the disconnecting operation of the handle when the contact point of the circuit breaker is in a molten state .

(2) In the preceding item (1), on the sliding base of the driving mechanism, a pushing member opposite to the rocker handle of the circuit breaker on the connection side is provided separately from the base body, and the pushing member is connected with the rocker handle of the circuit breaker through a spring. The base body is connected.

In the above structure, if the elastic force of the return spring (compression spring) of the locking lever on the sliding base is set so that the operating force applied to the rocker handle does not bend the spring when the circuit breaker is normally switched, When the operating handle of the external operating handle device is disconnected in the normal state where the main contact point of the circuit breaker does not melt, the rocker handle of the circuit breaker is driven to keep the locking lever at the original normal position and rotate The crank pin of the base, together with the locking lever, presses the slide base in the breaking direction.

And when the main contact point of the circuit breaker is in the abnormal state of melting, on the sliding base that hangs with the rocker handle, a very large binding force is added at this position. In this state, in order to disconnect the circuit breaker, when the operating handle of the external operating handle device is applied with a greater force than usual to return to the disconnecting direction, the The locking lever rotates against the return spring. Simultaneously, when the sliding base that is subjected to operating force presses the push part on the rocker handle to keep the connecting spring bent, and also moves a little with the locking lever to the disconnecting direction, the locking lever that rotates as described above is just connected with the locking lever. The limiter arranged on the body contacts and engages to prevent further movement of the sliding base.

As a result, when the operating knob of the external operating handle device cannot be returned to the position showing disconnection, it is possible to prevent a problem caused by handle operation in an abnormal state in which the main contact point is molten, which has been a problem in the existing external operating handle device. The misidentified disconnection display. In this case, since the sliding base is prevented from moving in the disconnecting direction, excessive operating force will not be exerted on the rocker handle of the circuit breaker, thereby preventing deformation of movable parts inside the circuit breaker.

Description of drawings

Fig. 1 is an exploded perspective view of a drive mechanism of an external operating handle device according to an embodiment of the present invention;

Figure 2 is a diagram illustrating the action of the drive mechanism, (a) and (b) are diagrams showing the course of action when the external operating handle device performs a disconnection operation in a state where the contact point of the circuit breaker is molten;

3 is a diagram showing the state of installing an external operating handle device in the circuit breaker, (a), (b), and (c) are respectively a side sectional view and a plan view of a state in which the handle device cover is removed;

Fig. 4 is a structural sectional view of a circuit breaker suitable for the external operating handle device;

Fig. 5 is the exterior view of the external operating handle device of existing implementation, (a), (b) are plan view and side view respectively;

Explanation of symbols: 1 circuit breaker; 2 body shell; 6 movable contact; 7 switch mechanism; 9 rocker handle; 11 external operating handle device; 12 body; 12a limiter; 13 operating handle; Rotating base; 18a crank pin; 19 sliding base; 19a pushing part; 19b connecting spring; 20 locking lever; 21 return spring.

Detailed ways

Embodiments of the present invention will be described below based on the examples shown in FIGS. 1 to 3 . Figure 1 is a diagram of the driving mechanism of the external operating handle device; Figure 2 (a), (b) is a diagram illustrating the operation of the driving mechanism; Figure 3 (a) to (c) shows the installation of the external operating handle in the circuit breaker In the state diagram of the device, in the embodiment, the components corresponding to those in Fig. 4 and Fig. 5 are given the same symbols.

First, in FIG. 1 , the drive mechanism 17 is connected to the rotating base 18 connected to the rotating shaft of the operating handle 13 (refer to FIG. 3 ) and is connected to the rotating base 18. As shown in FIG. 3 , it is connected to the rocker handle 9 of the circuit breaker 1. The slide base 19, which is a hooked resin molded product, is the basic component. The crank pin 18a of the rotation base 18 and the L-shaped lock lever 20 arranged opposite to the disconnected side are installed in the recessed part formed on the upper surface of the slide base 19. , and the return spring 21 of the locking lever 20, at the left end of the sliding base 19, integrally formed with the pushing part 19a that is separated from the base body and is opposite to the connection side of the circuit breaker rocker handle 9, and the The pushing part 19a is connected with the connecting spring 19b of the base body. A more or less gap is set between the base body of the sliding base 19 and the pushing part 19a to limit the movable range of the pushing part. As shown in FIG. 3, a slide base 19 is inserted into the lower side of the body 12, guides and supports it so that it can slide in a linear direction.

Here, one end of the lock lever 20 is swingably fixed near the side of the slide base 19 via a support shaft 20a, and a claw portion 20b engaged with a stopper described below is formed at an L-shaped corner of the lock lever. The return spring 21 is a compression spring that is inserted between the front end of the lock lever 20 and the end surface of the recess on the upper surface of the slide base 19 and energizes the lock lever 20 from behind. The handle 13 is set at such a strength that it does not bend under normal operating force applied to the operating handle 13 . And in the guide groove portion of the sliding base 19 in the body 12, a limiter 12a protruding toward the side of the sliding base is formed, so that it coincides with the claw portion 20b when the above-mentioned locking lever 20 rotates (clockwise).

As shown in (a) to (c) of Fig. 3, the external operating handle device 11 of the above-mentioned structure is installed on the main body casing 12 of the circuit breaker 1. On and off side) clamping the rocker handle 9 of the circuit breaker. In Fig. 3(b), 12b is the cover of the main body 12, and 12c is the locking groove, which fits and locks the locking plate 15 drawn out from the operating handle 13 at the position showing disconnection.

Therefore, in the normal state where the main contact point of the circuit breaker 1 is not welded, the operating handle 13 of the external operating handle device 11 is switched between the ON and OFF positions, and when the ON operation is performed, the handle of the base 18 is rotated. The crank pin 18a directly presses to the left, contacts with the recessed part of the sliding base 19, and the rocker handle 9 of the circuit breaker that is engaged with the sliding base 19 falls to the on position. As a result, the switching mechanism 7 accordingly closes the main contacts. And when disconnecting operation, the crank pin 18a of slide base 18 contacts with the locking lever 20 that is in normal position energized by back-moving spring 21, slide base 19 is pressed to the right together with locking lever. Thus, the sliding base 19 moves the rocker handle 9 to the off position through the push member 19a, so that the circuit breaker is in the off position.

In addition, in the abnormal state where the contact point of the circuit breaker is melted, when the operating handle 13 of the external operating handle device is applied force to return to the disconnected position, the sliding base 19 constrained in this position does not move and is pressed. The lock lever 20 on the crank pin 18a of the rotating base 18 opposes the return spring 21 and rotates clockwise around the fulcrum 20a, and the claw portion 20b of the lock lever 20 faces the iron stopper formed on the body 12. 12a protrudes (refer to FIG. 2(a)). In addition, when the pushing member 19a is pressed and brought into contact with the rocker handle 9, the slide base 19 moves rightward while compressing and bending the connection spring 19b, and the claw portion 20a of the lock lever 20 is engaged with the stopper 12a. Close (referring to Fig. 2 (b)), prevent slide base 19 from moving further to the right. As a result, the operating handle 13 cannot be returned to the position indicating the disconnection.

In the process of changing from Fig. 2 (a) to (b), the connecting spring 19b of the sliding base 19 is deflected to absorb the power of the rocker handle 9 pressing the circuit breaker, and the rocker handle 9 will not move and stop at In the original position, there will be no deformation of the movable parts (movable contacts) inside the circuit breaker. At this point, it is assumed that when the rocker handle 9 is directly pressed to the disconnection direction by the sliding base 19 that is not provided with the movable pushing part 19a and the connecting spring 19b, when the sliding base 19 changes from Fig. 2 (a) to (b ) change process, in addition to forcibly pulling the rocker arm handle 9 to deform the movable contact of the circuit breaker, if the operating handle 13 of the external operating handle device is repeatedly returned from this state to the position where one end is connected and then returns to the direction of disconnection Operation, because the contact position of the sliding base 19 and the rocker handle 9 will be shifted to the disconnected side compared with the previous operation, the claw part 20b of the locking lever 20 will not engage with the stopper 12a and has no isolation function .

In the illustrated example, the connection spring 19b is integrally formed with the slide base 19 of the resin molded product, but an independent member made of metal may also be used.

The circuit breaker suitable for using the external operating handle device of the embodiment is not limited to the circuit breaker shown in FIG. 4 , and is undoubtedly applicable to other types of circuit breakers equipped with rocker handles with different opening and closing mechanisms.

As mentioned above, according to the present invention, in the external operating handle device for turning on and off the circuit breaker equipped with a rocker handle in the panel from outside the panel, because in its drive mechanism, according to the circuit breaker In the abnormal state where the main contact point is melted, the operating handle cannot be moved to the disconnected position to set the locking device, so that the handle device itself has the function of isolation, so that

In the abnormal state where the contact point of the circuit breaker is melted, even if the external operating handle device is disconnected, the operating handle cannot return to the position where the display is disconnected. It improves the safety of maintenance and management by preventing misoperation that becomes a problem in the device and preventing electric shock accidents due to misidentification of circuit breakers.

By adopting the configurations of the above-mentioned invention aspects 2 and 3 as the locking means, it is possible to have the locking means without imposing an excessive operating load on the circuit breaker, thereby improving reliability.

Claims (3)

1. the external operation handle device of a circuit-breaker, this device can be outside coiling to the circuit-breaker that is provided in the band rocker handle in the dish connect, opening operation, this handle apparatus by with the body that combines of circuit-breaker own; The rotary operating handle that is provided with previously at this body; And will make up with the rotating base and the sliding bottom of crank-pin, be that the assembly of straight-line driving mechanism constitutes with the rotational transform of operating handle, described sliding bottom hung mutually with the rocker handle of circuit-breaker close, drive rocker handle to the position of connecting, disconnecting, it is characterized in that

In described driving mechanism, be provided with Lock Part, it is locked hand under the abnormality of the main contactor generation fusion of circuit-breaker, makes it can not shift to open position.

2. the external operation handle device of circuit-breaker as claimed in claim 1, it is characterized in that, Lock Part as operating handle, be provided with on the sliding bottom of driving mechanism, disconnect the securing rod that stands facing each other on the direction with the crank-pin of rotating base, and this securing rod pressed to entopic back-moving spring, simultaneously also be provided with stop in base side, can utilize the opening operation that is in the handle under the molten condition at the contact point of circuit-breaker, the described securing rod extension that tilts with resisting with back-moving spring closes and stops sliding bar to disconnecting moving of direction.

3. the external operation handle device of circuit-breaker as claimed in claim 2, it is characterized in that, on sliding bottom, be provided with the push mechanism that stands facing each other mutually at the rocker handle of connecting side and circuit-breaker discretely with its base body, this push mechanism is connected with the base body by spring.

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