KR19990028942U - Main shaft rotation range limiter of circuit breaker - Google Patents

Abstract

The present invention is to improve the structure of the main shaft rotational range limiter of the circuit breaker to improve the reliability and durability of the main shaft rotational range limiter.

To this end, the present invention is a lever (2) coupled to the opening and closing handle (1), the side plate (3) hinged to the lever 2, the latch (4) hinged to the side plate (3) ), A latch holder (5) installed at the other side of the side plate (3) and holding the latch (4), and an upper link (6) hinged to form a pair on both sides through the latch (4); , The lower link 7 which is hinged to the lower part of the upper link 6 and the lower link 7 connected to the lower end of the lower link 7 so as to interlock with the upper and lower links 7 according to the operation of the opening and closing handle 1. The main shaft 8 rotated by the main shaft 8, the movable contactor 9 which is coupled to the main shaft 8 so as to be rotatable and rotates when the breaker is inserted and tripped, and the movable contactor 9 is connected. And a circuit breaker having spaced apart fixed contactors 10; In the paired upper link 6, limit pins 11 penetrating both upper links 6 are provided, so that both upper links 6 of the limit pins 11 when the handle 1 is opened and closed. The main shaft rotation range of the circuit breaker for which the part between the upper and lower parts of the latch 4 is caught and the movement of the upper link 6 is constrained so that the rotation of the main shaft 8 interlocked with the upper link 6 is also restricted. Limiting devices are provided.

Description

Main shaft rotation range limiter of circuit breaker

The present invention relates to a main shaft rotation range limiting device of a circuit breaker, and more particularly, to improving the structure of the circuit breaker to improve the operation reliability and durability of the device limiting the rotation range of the main shaft when the circuit breaker is turned on. will be.

In general, wiring breakers are mainly installed in switchboards in factories, buildings, etc., and act as a switchgear that supplies or cuts power to the load side under no load condition. When a large current exceeding the load current flows in order to protect the electric wires of the converter and the load-side equipment, it serves as a circuit breaker that supplies or cuts off the power supplied from the power supply to the load.

1 is a perspective view of a circuit breaker. The circuit breaker is manufactured in various structures due to different sizes, poles, and operation methods, but includes molded case, contactor, tripping device, opening and closing mechanism, arcing device, terminal, and the like. It is composed of as basic elements.

The conventional circuit breaker configured as described above prevents breakage or fire of the wiring and the connected equipment by quickly disconnecting the circuit when an abnormality occurs in the circuit, and the operating characteristics of the circuit breaker are demonstration trip, pure seat lip, It is divided into three types of one sheet lip.

The operation characteristics of the circuit breaker described above will be briefly described as follows.

First of all, the demonstration trip will cause a fire if the electric wire becomes hot and left unattended if more than 125% of the rated current flows for a certain time. Say that.

In addition, the forward seat lip refers to interrupting the fault current by tripping the circuit breaker at the moment when a large fault current occurs momentarily due to a load line or a load abnormality.

Also, in case of single-circuit circuit breaker and branch circuit breaker in series, in case of an accident current in one branch circuit close to the load side, the circuit breaker of branch circuit is before the circuit breaker for trunk wiring. The circuit breaker delays the time that the circuit breaker for tripping trips, and this characteristic can be said to be a characteristic only for a circuit breaker capable of adjusting the net trip value.

On the other hand, the conventional circuit breaker in the on (on) state, as shown in Figure 2a, the latch 4 is constrained by the latch holder 5, the latch holder 5 is supported on the nail 12 top By being supported by the jaw portion 12a, the latch 4 having a tendency to rotate by the restoring force of the main spring (not shown) is constrained to the latch holder 5.

That is, since the latch 4 tries to escape the latch holder 5 by the restoring force of the main spring, but the latch holder 5 is supported and fixed by the nail 12, the latch holder 5 does not escape the latch holder 5, The contact will remain closed.

On the other hand, when the tripping action of the breaker is made due to the overload in the on state as shown in Figure 2a, the shooter (not shown) provided in the tripping device by the operation of the tripping device as shown by the arrow in Fig. 12) to rotate the nail clockwise around the pivot shaft 13 in the drawing, so that the support jaw portion 12a of the nail 12 can no longer support the latch holder 5, so that the main By the restoring force of the spring, the latch 4 is released from the latch holder 5 to rotate counterclockwise.

In addition, as the latch 4 is released as described above, the upper link 6 and the lower link 7 connected to the latch 4 interlock to move the movable contact 9 in a direction away from the fixed contact 10. By rotating the main shaft 8, the contact is opened as shown in Fig. 2B.

In addition, when the breaker is manually turned off by operating the opening / closing handle 1 in the on state as shown in FIG. 2A, the lever 2 connected to the opening / closing handle 1, the main spring, and the upper and lower links are shown. The main shaft rotates in the clockwise direction in the drawing by the linkage mechanism of the link mechanism consisting of (7). As a result, the contact of the movable contactor 9 coupled to the main shaft as shown in FIG. It is separated from the contact of.

On the other hand, when the breaker is turned on while the breaker is tripped as shown in FIG. 2B, the circuit breaker 1 is further moved to the right in the drawing to reset the breaker once as shown in FIG. 2C. In addition, the opening and closing handle 1 is moved to the input position on the left side of the drawing, and as shown in FIG. 2A, the contacts of the movable contactor 9 and the fixed contactor 10 are closed.

In addition, as shown in FIG. 2C, when the breaker is to be turned on in the off state, the handle 1 for opening and closing is immediately moved to the closing position on the left side of the drawing without having to send it to the reset position. As shown, the contacts of the movable contact 9 and the contacts of the fixed contact 10 are in a closed state.

On the other hand, the conventional wiring breaker which operates in this way has a lever (2) connected to the opening / closing handle (1), a main spring and an upper / lower link (7) when the opening / closing handle (1) turns on the circuit breaker. The main shaft 8 is rotated in a direction in which the angle between the upper link 6 and the lower link 7 is maximized by an interlocking action of the link mechanism.

At this time, in order to be able to trip and turn off the opening and closing mechanism again in the on state of the breaker, the rotation range of the main shaft 8 should be limited so as not to exceed a certain limit during the input of the handle.

Therefore, in the related art, as shown in FIGS. 2A to 2C, the rotation range of the main shaft 8 is limited by installing a stopper 14 on one side of the latch 4 to limit the movement of the upper link 6.

However, such a structure of the main shaft 8 rotational range limiting structure of the conventional circuit breaker includes a stopper 14 on one side of the latch 4 that restricts the rotational range of the main shaft 8 when the handle is inserted. (4) By limiting the movement of one of the upper links 6 located to be paired on both sides, the structure also limits the movement of the paired opposing upper links 6.

Therefore, during braking action of the stopper 14 due to the rotation of the upper link 6, the force applied to the stopper 14 acts as a rotation moment for rotating the stopper 14 about a fixed point, thereby There has been a problem in that the operation reliability and durability of the opening and closing mechanism such as the latch 4 and the stopper 14 are lowered.

The present invention is to solve the above-mentioned problems, by improving the structure of the main shaft rotation range limiting device of the circuit breaker to reliably limit the rotation range of the main shaft at the time of circuit breaker input, It is an object of the present invention to provide a main shaft rotation range limiting device for a circuit breaker to improve durability.

1 is a perspective view showing a conventional circuit breaker

2A to 2C are longitudinal cross-sectional views showing main parts of a conventional circuit breaker;

Figure 2a is a state diagram when the breaker on

2B is a state diagram when a breaker trips

2C is a state diagram when the breaker is manually turned off

3a to 3c is a longitudinal sectional view showing a main circuit breaker of the present invention,

Figure 3a is a state diagram when the breaker on

3B is a state diagram when a breaker trips

3C is a state diagram when the breaker is manually turned off

* Explanation of symbols for main parts of the drawings

1: handle for opening and closing 2: lever

3: side plate 4: latch

5: latch holder 6: upper link

7: lower link 8: main shaft

9: movable contactor 10: fixed contactor

11: limit pin 12: nail

12a: support jaw 13: pivot

14: stopper

In order to achieve the above object, the present invention is a lever coupled to the opening and closing handle, a side plate hinged to the lever, a latch hinged to the side plate, and the other side of the side plate is installed on the latch A latch holder for holding, an upper link hinged to form a pair on both sides through the latch, a lower link hinged to a lower portion of the upper link, and a lower link of the lower link, A main contactor pivoted by an interlocking action of an upper and a lower link, a movable contact having a dual contact structure rotatably coupled to the main shaft and pivoting when a breaker is inserted and tripped, and a fixed contactor to which the movable contactor is connected and spaced apart In the circuit breaker provided with; In the paired upper links, limit pins penetrating both upper links are installed, so that a portion between both upper links of the limit pin is caught on the lower end of the latch when the opening and closing handle is closed, thereby restraining the movement of the upper link. There is provided a main shaft rotation range limiting device for a circuit breaker, characterized in that the rotation of the main shaft in conjunction with the upper link is also restrained.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 3A to 3C.

3a to 3c is a longitudinal sectional view showing the main portion of the circuit breaker according to the present invention, the present invention is a lever (2) coupled to the opening and closing handle (1), and the side plate hinged to the lever (2) ( 3), a latch 4 hinged to the side plate 3, a latch holder 5 provided on the other side of the side plate 3 to hold the latch 4, and the latch 4 An upper link 6 hinged to form a pair on both sides through the upper link, a lower link 7 hinged to the lower portion of the upper link 6, and a handle for opening and closing connected to a lower end of the lower link 7 The main shaft 8 which is rotated by the interlocking action of the upper and lower links 7 according to the operation of (1) and the dual contact which is pivotally coupled to the main shaft 8 to rotate when the breaker is inserted and tripped. A movable contact 9 having a structure and a fixed contact 10 to which the movable contact 9 is connected and spaced apart from each other are provided. In the molded case circuit breaker; In the paired upper link 6, limit pins 11 penetrating both upper links 6 are provided, so that both upper links 6 of the limit pins 11 when the handle 1 is opened and closed. The portion between the upper and lower portions of the latch 4 is caught by the lower surface of the latch 4 so that the rotation of the main shaft 8 interlocked with the upper link 6 is also restricted.

The operation of the present invention configured as described above is as follows.

First, when the circuit breaker of the present invention also has an error in the circuit, the circuit is quickly cut off to prevent the destruction or fire of the wiring and the connected device, the trip operation of the circuit breaker is the same as described in the prior art. .

On the other hand, the process of resetting or turning on the tripped circuit breaker is also made by the same operation principle as the above-described prior art, so this is omitted and described mainly by the action of the limit pin 11 as follows.

3B is a state diagram when the breaker is tripped, and FIG. 3C is a state diagram when the breaker is off. First, when the breaker is turned on in the state where the breaker is tripped as shown in FIG. By further resetting the circuit breaker as shown in FIG. 3C and then moving the opening / closing handle 1 to the closing position on the left side of the drawing again, as shown in FIG. 3A, as shown in FIG. 3A. The contact of (10) is closed.

3C, when the breaker is to be turned on in the OFF state, the opening / closing handle 1 is immediately moved to the closing position on the left side of the drawing without the need to send the opening / closing handle 1 to the reset position. As a result, the contact of the movable contact 9 and the contact of the fixed contact 10 are closed as shown in FIG. 3A.

In this way, when the breaker is turned on in the tripped off state, the upper link (by the link mechanism consisting of the lever 2 connected to the opening and closing handle 1 and the link mechanism consisting of the main spring and the upper and lower links 7) As described above, the main shaft 8 is rotated in a direction in which the angle between 6) and the lower link 7 is maximized.

At this time, in order to trip and turn off the opening and closing mechanism again in the on state of the breaker, the rotational amount of the main shaft 8 should be restricted so as not to exceed a certain limit in the process of injecting the handle. As shown in FIG. 3C, the limit pin 11 is provided on one side of the latch 4 without the force being biased at any part by the limit pin 11 installed to penetrate the paired upper links 6. By limiting the movement of the upper link (6) by installing it limits the rotation range of the main shaft (8).

That is, when the input using the handle of the breaker, the rotating upper link (6) abuts and fixed to the lower end of the latch (4), so that the main shaft (8) interlocking with the upper link (6) also stops the rotation. As the rotation range of the main shaft is limited, tripping and off of the breaker are possible.

As described above, the present invention improves the structure of the rotation range limiter of the main shaft 8 of the circuit breaker.

That is, the limiting structure of the main shaft 8 rotation range of the circuit breaker according to the present invention is installed to penetrate the upper link 6 when the handle is inserted, thereby limiting the rotation range of the main shaft 8. By being caught and restrained by the latch 4, the movement of the main shaft 8 is also restricted.

At this time, the limit pin 11 supported on both upper links 6 has a braking action at the center of the pin, so that the force applied to the limit pin 11 is different from one end of the limit pin 11. Since it is caught in the center part without being biased, the operation reliability and durability of the latch 4 and the opening / closing mechanism can be improved.

Claims (1)

A lever coupled to the opening / closing handle, a side plate hinged to the lever, a latch hinged to the side plate, a latch holder installed on the other side of the side plate to hold the latch, and penetrating the latch. The upper link hinged to be paired on both sides, the lower link hinged to the lower portion of the upper link, and connected to the lower end of the lower link is rotated by the interlocking action of the upper and lower links according to the operation of the opening and closing handle A circuit breaker having a main shaft, a movable contact having a dual contact structure rotatably coupled to the main shaft and rotating when the breaker is inserted and tripped, and a fixed contactor to which the movable contact is connected and spaced; In the paired upper links, limit pins penetrating both upper links are installed, so that a portion between both upper links of the limit pin is caught on the lower end of the latch when the opening and closing handle is closed, thereby restraining the movement of the upper link. Main shaft rotation range limiting device for a circuit breaker, characterized in that the rotation of the main shaft interlocked with the upper link.