KR200196958Y1 - Bi-metal cross bar in mccb - Google Patents

Abstract

The present invention relates to a circuit breaker, and more particularly, a gap adjusting means is installed between the bimetal and the cross bar so as to be movable within the gap range, and the gap adjusting means is moved according to the change of the rated current. The present invention relates to a gap adjusting device between a bimetal for a circuit breaker and a cross bar to adjust a gap of a wire.

The present invention for this purpose is to provide a circuit breaker having a heater for detecting an overcurrent, a bimetal bent when the heater heat is transmitted connected to the heater, and a cross bar to maintain the open / closed state of the link portion; The gap adjusting means may be installed between the bimetal 6 and the cross bar 7 to be movable within the gap range, and the gap between the bimetal and the cross bar may be adjusted by moving the gap adjusting means according to the change of the rated current. It would be.

Description

Spacing device between bimetal for wiring breaker and cross bar

The present invention relates to a circuit breaker, and more particularly, a gap adjusting means is installed between the bimetal and the cross bar so as to be movable within the gap range, and the gap adjusting means is moved according to the change of the rated current. The present invention relates to a gap adjusting device between a bimetal for a circuit breaker and a cross bar to adjust a gap of a wire.

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 state. It acts as a circuit breaker to cut off the power supply from the power supply side to the load side in order to protect the electric wires and load-side equipment in case of overcurrent.

In the case of overload, it detects the overload by using bi-metal, which is a junction of two members with different thermal conductivity, and cuts off the current. It uses the principle of magnet to cut off the converter.

Such a circuit breaker is a power supply terminal (1) receiving power from the converter as shown in Figure 1, a fixed and movable contactor (2) (3) for transmitting it to the load side, and the movable contactor (3) fixed contactor ( 2) and a link unit 4 for operating in an open or closed state, and a heater 5 for detecting overcurrent as shown in FIG. A bimetal 6 and a cross bar 7 for restraining the open / closed state of the link portion are also provided.

Therefore, when an overload current is generated in the circuit breaker in the closed state, the overload current is transmitted to the heater 5 through the fixed contactor 2 and the movable contactor 3, and the overload current is a current higher than the rated current. Heat is generated in (5).

As such, when heat is generated in the heater 5 by a current higher than the rated current, that is, an overload current, as shown in FIG. 2B, the bimetal 6 is cross-bard due to the conducted heat as it is conducted to the bimetal 6 that is in contact with it. The bending force 6a, which is bent toward (7), and which is attached to the upper end of the bimetal 6 by the bending force, pushes the cross bar 7 to rotate gradually in the counterclockwise direction on the drawing.

At this time, the link portion 4, which has been restrained by the cross bar 7, is closed by the rotation of the cross bar 7, and the fixed contactor 2 and the movable contactor 3 are opened. The converter converts into the open state and prevents the overload current from continuously flowing, thus protecting the converter and the load from the overload current.

However, in the conventional overload detection apparatus, the bimetal 6 is deformed due to the heater heat, and thus the link part 4 is canceled while narrowing the gap ℓ between the space adjusting screw 6a and the cross bar 7. Although it has been managed, since it is virtually impossible to assemble the gap between the cross bar 7 and the bimetal 6 in the same manner, there is a problem in that the current characteristics are different due to the gap between the cross bar and the bimetal according to each product.

In addition, the existing product has been fixed so that the interval between the cross bar (7) and the bimetal (6) can not be adjusted, the compatible use is not possible according to the rated current has a problem that the use range is limited.

In addition, considering that the amount of curvature and the bending force of the bimetal 6 are different for each product, there is a problem that the reliability is poor in the reproducibility of the correct operation due to these change factors.

Therefore, the distance between the bimetal and the cross bar can be arbitrarily adjusted according to the change of the rated current, as well as a mechanical device capable of overcoming this even if the amount of curvature of the bimetal is different.

The present invention has been made to solve the conventional problems as described above, the purpose is to be able to adjust the distance between the bimetal and the cross bar according to the change of the rated current.

The present invention for achieving the above object is a wiring breaker having a heater for detecting an overcurrent, a bimetal that is curved when the heater heat is transmitted and connected to the heater, and a cross bar that can restrain the state by opening and closing the link portion. In; A bimetallic circuit breaker bimetal is installed between the bimetal and the cross bar so as to be movable within the gap range, and the gap adjusting means is moved according to the change of the rated current to adjust the gap between the bimetal and the cross bar. It is to provide a gap control device and the cross bar.

1 is a vertical cross-sectional view showing an example of a typical circuit breaker

Figure 2a is a longitudinal sectional view of a conventional overcurrent detection device

2b is an operation state diagram of a conventional overcurrent detection device

Figure 3 is a front view showing a spacing device of the present invention

4 is a cross-sectional view taken along line II of FIG. 3.

5 is a perspective view of a moving tripper constituting the gap adjusting device of the present invention

6 is an operation state diagram of the subject innovation spacing device

7 is a front view showing another embodiment of the subject innovation spacing device

8 is a front view showing another embodiment of the present invention the spacing device

Explanation of symbols for main parts of the drawings

6: bimetal 7: cross bar

8: case 8a: first groove

8b: opening 8c: second groove

9: pin 10: spring

11: moving tripper 12: adjusting knob

Figure 3 is a front view showing a gap adjusting device of the present invention, Figure 4 is a cross-sectional view of the line II of Figure 3, Figure 5 is a perspective view of a moving tripper constituting the gap adjusting device of the present invention, Figure 6 7 is a front view illustrating another embodiment of the inventive design of the inventive spacing device, and FIG. 8 is a front view illustrating another embodiment of the inventive design of the spacing device. When explaining the spacing device between the bimetal for the circuit breaker of the invention and the cross bar in detail.

The present invention is installed between the bimetal 6 and the cross bar (7) so as to be movable within the interval range as shown in Figure 3 and 5, the interval adjusting means is moved in accordance with the change of the rated current By adjusting the distance between the bimetal (6) and the cross bar (7).

The gap adjusting means includes a pin 9 supported on the case 8 so as to be movable at a predetermined interval in the range between the bimetal 6 and the cross bar 7, and the bimetal 6 is rotatably coupled to the pin. ) And a moving handle (11) connected by a spring (10) and an adjusting handle (12) provided on one side of the moving tripper (11) to be exposed to the outside of the case (8), This allows the pin and the moving tripper to move together.

In order to move the pin 9 from the case 8 as described above, a single first groove 8a is provided on one side of the case, and a plurality of openings 8b are formed on the opposite side thereof. Two grooves 8c, one end of the pin 9 is inserted into the first groove 8a and the other end is inserted into any one of the second grooves 8c so that both ends are supported by the case. In order to move the position of the pin 9, one end of the pin is restrained by the first groove 8a, and the other end of the pin is controlled by the knob 12. The side of the pin 8 can be moved toward the bimetal 6 or the cross bar 7 as it is separated through the opening 8b and inserted into another second groove 8c.

Therefore, when heat is generated in the heater 5 due to the generation of an overload current, as the heat is conducted to the bimetal 6 that is in contact with it, the bimetal is bent toward the cross bar 7 by the conduction heat, and this bending force By advancing in the direction in which the spaced adjustment screw (6a) fixed to the upper end of the bimetal (6) is pushed the moving tripper 11 located in front of it.

Accordingly, the moving tripper 11 rotates the proper angle about the pin 9 by the thrust of the bimetal 6 to push and rotate the cross bar 7 located at the front thereof.

At this time, the link portion 4, which has been restrained by the cross bar 7, is closed by the rotation of the cross bar and the fixed contact 2 and the movable contact 3 are opened to open the converter. The transition to the state prevents the overload current from continuously flowing, thus protecting the converter and the load from the overload current.

On the other hand, since the heat is not conducted to the bimetal 6 when the overload current disappears, the bimetal that is bent is returned to its original position while being naturally cooled, and the moving tripper 11 and the bimetal 6 are springs 10. Since the bimetal is erected upright (returned), the moving tripper 11 is also returned to its state before being rotated in conjunction with it.

As described above, the operation according to the generation of the overload current is similar to the conventional method, but the moving tripper 11 is installed between the bimetal 6 and the cross bar 7 so that the bending force of the bimetal is cross bar ( It is not directly transmitted to 7) but indirectly transmitted by using the moving tripper 11 as a medium.

On the other hand, in order to adjust the distance between the bimetal (6) and the cross bar (7) by the gap adjusting means one end of the pin (9) by lifting the adjustment knob 12 exposed to the outside of the case (8) Is separated through the opening 8b of the first groove 8a, and the other end of the pin 9 is restrained by the second groove 8c.

As described above, after one end of the pin 9 is kept separated from the first groove 8a, the adjusting knob 12 is moved in a direction orthogonal to the pin 9, and then any one of the plurality of first grooves. When the adjustment knob 12 is put down while being positioned on the groove, one end of the pin 9 is inserted through the opening of the groove.

Accordingly, the moving tripper 11 coupled to the pin 9 moves toward the bimetal 6 or the cross bar 7 by the moving distance of one end of the pin 9, and thus the moving tripper 11 according to the magnitude of the rated current. The distance between the fur 11 and the cross bar 7 can be adjusted stepwise by the number of the first grooves 8a.

As described above, in order to ensure the accuracy of the movement interval when the positions of the pin 9 and the moving tripper 11 are moved, a marking scale 8d is formed on the case part corresponding to the movement path of the adjustment knob 12 to manually Inaccuracies during position shift due to manipulation are prevented.

Meanwhile, in the above embodiment, a structure in which only one end of the pin 9 is moved through the first groove 8a has been described. However, as shown in FIG. 7, a plurality of openings 8b are formed at one side and the other side of the case 8, respectively. The first and second grooves 8a and 8c are provided to correspond to each other, and the pins are inserted into the case by inserting one end and the other end of the pin 9 into the corresponding first and second grooves 8a and 8c, respectively. 8) and the pin 9 through the opening 8b of the first and second grooves 8a and 8c inserted using the adjusting knob 12 when moving the position of the pin 9. It is also possible to move the both ends of the pin (9) to the bimetal (6) or the cross bar (7) at the same time by removing the both ends of the first and second grooves, respectively, of course.

As described above, this technique makes it possible to achieve more stable operation by simultaneously moving both the pin 9 and the moving tripper 11 instead of the unidirectional movement.

In addition, in the above, the first and second grooves 8a and 8b are formed on both sides of the inner surface of the case 8, and both ends of the pin 9 are fitted into the grooves. A plurality of grooves 9a are formed at both ends, and a corresponding protrusion 8e is formed on the inner surface of the case 8 so as to move the pin 9, as shown in FIG. The technique of allowing the to be inserted can also be applied (see FIG. 8).

As described above, the present invention can adjust the distance between the bimetal and the cross bar within a continuous range, so that the overcurrent characteristic of the circuit breaker can be arbitrarily and simply adjusted according to the load change or the user's purpose. Even if the bending force is different, the accuracy of the operation can be continuously reproduced regardless of these change factors, resulting in improved reliability of the device.

Claims (5)

A circuit breaker comprising: a heater for detecting an overcurrent; a bimetal that is connected to the heater and is bent when the heater heat is transmitted; and a cross bar that can restrain the open / close state of the link unit; A bimetallic circuit breaker bimetal is installed between the bimetal and the cross bar so as to be movable within the gap range, and the gap adjusting means is moved according to the change of the rated current to adjust the distance between the bimetal and the cross bar. And distance between the cross bars. The method of claim 1, The gap adjusting means includes a pin supported on the case to be movable at a predetermined interval in the range between the bimetal and the cross bar, A moving tripper coupled to the pin and connected by a bimetal and a spring, An interval adjusting device between a bimetal for a circuit breaker and a cross bar, comprising an adjustment knob provided on one side of the moving tripper to be exposed to the outside of the case. The method according to claim 1 or 2, One groove is provided at one side of the case and a plurality of grooves having an opening is formed at the opposite side thereof to move the pin from the case, so that one end of the pin is inserted into the one groove and the other end of the pin is provided. The end of the pin is inserted into any one of the plurality of grooves so that both ends are supported by the case, and when moving the position of the pin, one end of the pin is inserted into one groove and the other end of the pin is adjusted. Spacer control device between the bimetal and the cross bar for the circuit breaker, characterized in that to move through the opening of the groove that was inserted using the inserted into the other groove to move one side of the pin toward the bimetal or cross bar. The method of claim 2, A plurality of grooves each having openings formed at one side and the other side of the case are provided to correspond to each other, so that the pins are supported on the case by inserting one end and the other end of the pin into the corresponding groove, respectively. For the circuit breaker characterized in that both ends of the pins are separated through the openings of the grooves inserted using the adjustment knobs and then inserted into the other grooves so that both ends of the pins can be simultaneously moved toward the bimetal or the cross bar. Spacer between bimetal and cross bar. The method of claim 2, Protrusions are formed on one or both sides of the case, and a plurality of grooves are formed at one or both ends of the pin so that the protrusions can be inserted, so that the positions of the pins can be moved by varying the positions of the grooves with respect to the protrusions. An interval adjusting device between a bimetal for wiring breaker and a cross bar.