KR100268012B1 - Circuit breaker - Google Patents

Abstract

PURPOSE: A trip apparatus of a circuit breaker is provided to perform a trip operation by instantly turning a cross bar when an over current is flowed on a load side and enlarge a range of a rated current by a user's simple manipulation without replacing a circuit breaker. CONSTITUTION: A cross bar(17) releases a latched condition of a latch and a latch holder. The cross bar(17) is installed on a case(1) to be pivotally rotated. A bimetal(19) is installed to be connected with a heater. The bimetal(19) is curved toward the cross bar when an over current is flowed on a load side adjacent to the cross bar. A circuit breaker includes the cross bar(17), the bimetal(19) and the heater. A shooter assembly instantly strikes the cross bar(17) by switching the curved motion of the bimetal into a strike motion between the cross bar(17) and the bimetal(19). The shooter assembly is coupled on a cover to be removable from an outside of the cover(2) by a locking unit. Latch jaws are correspondingly formed on both side walls of a space part of the cover(2). A hook is formed on the shooter assembly. A pair of elastic sections have the hook to be supported by the latch jaws.

Description

Demonstration trip device of circuit breaker

The present invention relates to a circuit breaker that is installed on a circuit and acts as a protection of the lines and peripherals by mechanically closing the circuit when abnormal current flows to the load side. More specifically, the rated current is applied to the load side. The present invention relates to a demonstration tripping device for a circuit breaker that deforms a bimetal according to heat generation of a heater when the excess overcurrent flows, thereby cutting off the supply of power.

In general, the wiring breaker is a device that protects the main surface equipment from overcurrent of low-voltage indoor converter in electrical equipment, and has the function of closing the converter when the load current and fault current are generated, and after closing the converter, it is reset by the user. Reusable features.

Such a circuit breaker performs a demonstration trip or an instant trip operation according to the characteristics of the overcurrent.

1 is a longitudinal cross-sectional view showing an off operation of a conventional circuit breaker, including a case 1 and a cover 2 constituting an enclosure, a plurality of (three phase) power supply terminals 3 receiving power from a converter, and the power supply side. It is rotatable around a fixed contactor 4 formed integrally with a terminal, a movable contactor 5 rotatably installed in a case so as to be positioned directly above each fixed contactor, and a latch pin 6 fixed to the case. A lever 7 which serves to push the movable contactor toward the stationary contactor when the power is turned on, and a handle for manual operation (hereinafter referred to as a “handle”) coupled to the lever and exposed to the outside of the cover 8 And a toggle link 11 having one end coupled to the movable contactor positioned in the middle of the plurality of movable contacts and the other end coupled to the link pin 10, and a link pin coupled to the toggle link. One end is combined and the other end is An upper link 12 supported by the latch, a toggle spring 13 connected between the lever and the link pin, a latch 14 rotatably installed around the latch pin, and a side plate fixed to the case ( A latch holder 16 which is rotatably installed at 15 and rotatably installed and supported by a latch during an off operation and a power-on operation, and a cross bar 17 which is rotatably installed at the case to push the latch holder during a demonstration trip operation. And a heater 18 which is fixed to the case and generates heat when an overflow flows on the converter, and a bimetal 19 that is vertically installed close to the heater and deforms toward the cross bar as the heater generates heat, and It consists of a head screw 20 screwed to allow the adjustment of the cross bar gap G on the upper part of the bimetal, and a load terminal block 21 formed integrally with the heater to supply power to the load side. The.

In the " off " state in which the power is not turned on, the latch 14 rotates clockwise as much as possible with the latch pin 6 to be held by the latch holder 16, and the movable contact 5 is fixed. The state opened from the contactor 4 is maintained.

Therefore, the power supplied from the power supply side terminal 3 is not transmitted to the load side.

In this state, when the handle 8 is pushed as shown in FIG. 1 to turn on the load, the lever 7 to which the handle 8 is coupled also rotates counterclockwise in the same direction as the handle about the latch pin 6. do.

In the above operation, both ends of the toggle spring 13 are fixed between the lever 7 and the link pin 10 so that the toggle spring is tensioned so that the upper link 12 and the toggle link 11 are interconnected. The link pin was pulled toward the rotational direction of the lever.

As a result, the upper link 12 having one end supported by the latch 14 is rotated clockwise around the support point of the latch, thereby changing the position of the link pin 10 supported by the other end of the upper link.

As such, when the position of the link pin 10 is changed, the position of the toggle link 11 to which the other end of the link pin is coupled is also variable, so that the movable contact 5 rotates toward the fixed contact 4 to form a closed path.

That is, the power supplied through the power supply terminal 3 is normally supplied to the peripheral device side through the fixed contactor 4-the movable contactor 5-the heater 18-the load terminal block 21.

However, if an overcurrent exceeding the rated current flows to the load side (the line or peripheral device of the peripheral device) while the power is normally supplied, the heater 18 generates heat, so that the bimetal 19 vertically installed so that one side is connected to the heater is heated. do.

When the thermally deformed bimetal 19 is deformed to be heated to the cross bar 17 side, the adjusting screw 20 screwed to the bimetal 19 pushes the cross bar 17 toward the latch holder 16 side. do.

Accordingly, the latch holder 16 is rotated to release the latching state of the latch pin 6, so that the toggle spring 13, which is tensioned with both ends fixed to the lever 7 and the link pin 10, is returned to its initial state. As it is compressed, the link pin 10 is pulled upward.

When the link pin 10 is pulled upward, the upper link 12 and the toggle link 11 which are mutually extended due to the change of the position of the link pin are folded to rapidly move the movable contact 5 connected to the fixed contact 4. It rotates clockwise and is opened from the fixed contact, thus protecting peripheral devices by preventing overload current from continuously being energized.

In the circuit breaker for demonstration trip as described above, the position of the adjustment screw 20 screwed to the bimetal 19 is varied to adjust the cross bar gap G, which is the distance between the tip of the adjustment screw and the cross bar 17. Thus, the rated current at the load side is adjusted according to the demonstration trip.

That is, when the cross bar gap G is reduced by tightening the adjusting screw 20 screwed to the bimetal 19, the adjusting screw 20 pushes the cross bar 17 at a small amount of curvature of the bimetal 19, thereby demonstrating the trip operation. As a result, the capacity of the rated current of the circuit breaker becomes small. On the contrary, when the crossbar gap G is increased by loosening the adjusting screw 20, the demonstration trip operation occurs due to the large amount of curvature of the bimetal 19. The capacity of becomes large.

However, the conventional apparatus for varying the capacity of the rated current required for the demonstration trip operation as described above has the following problems.

First, in order to adjust the rated current of the load side due to the expansion of the equipment, the user must remove the cover 2 from the case 1 and then tighten or loosen the adjusting screw 20, and then reassemble the cover. Therefore, the adjustment of the rated current was cumbersome.

In particular, if the user does not know the amount of cross bar gap (G) according to the rated current and adjusts it incorrectly, it will cause a fatal loss to the device and safety. Therefore, it is not necessary to adjust the cross bar gap. Replaced with a suitable new breaker.

Second, when an overcurrent exceeding the rated current flows on the load side, the bimetal 19 is gradually deformed and the cross bar 17 is pushed to perform the demonstration trip operation. Therefore, the time required for the demonstration trip is delayed. It would not be able to shut off the device, which would reduce the life of the device.

In particular, when a circuit breaker is installed in a work site with a lot of dust, and foreign matters such as dust are caught inside, it is impossible to release the latch state of the latch holder 16 and the latch 14 by the pushing force of the bimetal 19. As a result, continuous overcurrent flows to the load, causing damage to the equipment or, in severe cases, fire.

The present invention has been made to solve such a problem in the prior art, by converting the amount of deformation of the bimetal into a mechanical force to rotate the cross bar instantaneously when an overcurrent flows to the load side to enable the demonstration trip operation have.

Still another object of the present invention is to allow a user to increase the range of rated current by simple operation without replacing the installed circuit breaker as the rated current increases due to the expansion of equipment in the state in which the circuit breaker is installed. .

According to an aspect of the present invention for achieving the above object, the cross bar for releasing the latching state of the latch and the latch holder is rotatably provided in the case, and the cross section of the cross bar is curved toward the cross bar side when an overcurrent is energized to the load side. A circuit breaker for connecting a bimetal to a heater, wherein a demonstration trip device for a circuit breaker is provided between a crossbar and a bimetal, by installing a shooter assembly for switching the bimetal's bending motion to a blow motion and striking the crossbar instantaneously. Is provided.

According to another aspect of the present invention, a crossbar for releasing a latching state of a latch and a latch holder is rotatably installed in a case, and a bimetal curved to the crossbar side when an overcurrent is energized to a load side is provided in a proximal portion of the crossbar. A circuit breaker provided to be connected to each other, comprising: a shooter housing coupled outwardly on a cover positioned between the crossbar and bimetal, and elastically installed by the first elastic member to have a force to be rotated to the crossbar side to the shooter housing. When the over current is energized to the load side, the cross bar is momentarily hit and tripped, and upon reset, the shutter is pressed down by the blade pieces of the handle to return to the initial state, and the second elastic member has the force to be rotated to the bimetal side in the shooter housing. It is installed elastically by a member and when the normal current is supplied to the load side, The circuit breaker is composed of a shooter bar which maintains the state and releases the jam state with the shooter as the bimetal is bent due to the energization of the overcurrent, and the holding means that keeps the shooter and the shooter bar when the current is energized to the load side. Demonstration trip is provided.

1 is a longitudinal sectional view showing a conventional circuit breaker.

2 is a longitudinal sectional view of a circuit breaker to which the present invention is applied.

3 is an exploded perspective view showing the main part of the present invention.

4a is a state in which the shooter is locked by the shooter bar.

4b is a state in which the shooter is released from locking the shooter bar.

<Explanation of symbols for main parts of drawing>

1: case 2: cover

14 latch 16 latch holder

18: heater 19: bimetal

22: shooter assembly 23: shooter housing

25: shooter 29: protective cover

30: shooter bar 32: obstacle

33: stopper 34: hook

35 name plate

Hereinafter, with reference to the accompanying Figures 2 to 4b showing an embodiment of the present invention in more detail as follows.

Figure 2 is a longitudinal cross-sectional view of the circuit breaker to which the present invention is applied, Figure 3 is an exploded perspective view showing the main portion of the present invention, Figure 4 is a longitudinal cross-sectional view for explaining the operating state of the present invention.

In the configuration of the present invention, the same parts as those of the conventional circuit breaker will be omitted and the same reference numerals will be given.

According to the present invention, the bending assembly of the bimetal between the cross bar 17 and the bimetal 19 can be switched to the blow motion so as to replace the shooter assembly 22 that momentarily strikes the cross bar l7 according to the rated current of the load side. Removable installation

Referring to Figure 3 showing the configuration of the shooter assembly 22 as an embodiment in more detail as follows.

The shooter housing 23 is detachably coupled by the locking means to be exposed to the outside on the cover 2 located between the cross bar 17 and the bimetal 19, and the cross bar 17 inside the shooter housing. The first elastic member 24 is pivotally mounted to the side so as to have a force to be rotated to the side so that the cross bar 17 is momentarily blown and tripped when an overcurrent is applied to the load side. It is pressed by the blade piece 8a of the handle 8 to be reduced to the initial state.

The locking means for detachably locking the shooter housing 23 to the cover 2 forms a locking step (not shown) corresponding to both side walls of the space portion (not shown) formed in the cover 2. And the shooter housing 23 is formed by forming an elastic piece 27 is formed with a hook (27a) is supported by the locking jaw.

At this time, the pressing protrusion 28 is formed on the upper side of the hook 27a formed on the elastic piece 27 to be exposed to the outside.

This is because when the shutter housing 23 is detached from the cover 2 due to the increase in the rated current, the operator presses the pusher 28 with the thumb and index finger, without using a hook 27a and a separate tool. This is to make it easy to release the locking state of the locking jaw.

A protective cover 29 for closing the shooter housing 23 is installed on the upper surface of the cover 2 to be opened and closed.

This prevents dust or the like from accumulating on the shooter assembly 22 detachably coupled to the cover 2, and at the same time, the shooter assembly 22 is separated from the cover 2 by external force or carelessness. This is to prevent.

On the other hand, one side of the shooter 25 installed in the shooter housing 23, the shutter bar 30 is elastically installed by the second elastic member 31 so as to have a force to be rotated toward the bimetal 19 side, the normal current to the load side When the current is energized, the locking means maintains the locking state with the shooter 25 and the locking state with the shooter 25 is released when the bimetal l9 is bent due to the energization of the overcurrent.

The locking means is formed in the shooter 25 to extend horizontally on one side and the locking projection 32, and is formed to extend vertically on one side of the shooter housing 23, the normal projection on the load side of the locking projection 32 It consists of a stopper 33 which is put on and supported.

At this time, when the engaging bar 34 is formed on the shooter bar 30 so that the shooter bar 30 is rotated counterclockwise by the second elastic member 31, that is, during normal energization or trip completion. In the state, the engaging piece 34 is connected to the bottom of the shooter housing 23 to maintain the vertical state.

Various types of shooters in which the size of the cross bar gap G, which is the distance between the shooter bar 30 and the bimetal 19, and the elastic modulus of the second elastic member 31 are set differently according to the capacity of the rated current of the load side. The assembly 22 is provided to be appropriately selected according to the rated current of the load side.

At this time, the elastic modulus of the first elastic member 24 is set larger than the elastic modulus of the second elastic member 31.

This, the shooter bar 30 is elastically installed by the second elastic member 31 is rotated in accordance with the curvature of the bimetal 19 to release the locking state of the shooter 25 and only to be restored to the initial state after release. Therefore, the modulus of elasticity may be small, but the shooter 25 which rotates as the latching state of the shooter bar 30 is released and hits the crossbar 17 is quickly removed as the locking state of the shooter bar is released. This is because it must be rotated to the side.

Moreover, the name plate 35 which shows the rated current of the circuit breaker is attached to the upper surface of the shooter housing 23 which comprises each shooter assembly 22. As shown in FIG.

This allows the user to visually identify and replace the shooter assembly 22 corresponding to the rated current through the name plate 35 attached to the shooter housing 23 as the rated current on the load side varies. To do this.

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

For example, the shooter assembly 22 in which the rated current on the load side is set to 250 A is mounted on the space portion of the cover 2, and the handle 8 is rotated to the right in the drawing as far as possible in the off state.

As described above, in the state in which the handle 8 is rotated to the right as far as possible in the drawing, the latch 14 is rotated together with the lever 7 coupled to the handle to be caught by the latch holder 16 so that the upper link 12 and The movable contact 5 connected by the toggle link 11 is opened from the fixed contact 4.

In addition, since the handle 8 is rotated as far as possible to the right in the drawing, the shooter assembly 22 is in a reset state.

That is, even if the locking state between the shooter 25 and the shooter bar 30 is released as shown in FIG. 4B by the trip operation, the blade piece 8a of the handle moves the shooter 25 to the right side in the drawing when the handle 8 is rotated. Since the locking projection 32 formed on the shooter 25 is placed on the stopper 33 formed on the shooter bar 30, the shooter assembly 22 is reset.

In this state, when the user rotates the handle 8 to the right in the drawing in order to supply power to the load side, the lever 7 coupled to the handle is rotated together, and the lever and the link pin ( The toggle spring 13 connected between 10 is tensioned.

When the toggle spring 13 is tensioned, the link pin 10 is rotated clockwise around the one end of the upper link 12 supported by the latch 14 by the restoring force according to the tension, so that the folded upper Since the link l2 and the toggle link 11 are unfolded with each other, the movable contactor 5 is rotated to the fixed contactor 4 side and the contacts are interconnected so that power is supplied to the load side.

Therefore, the peripheral device installed on the load side can be operated.

However, when an overload occurs on the converter of the peripheral device or the load side during the operation of the peripheral device, the heater 18 is overheated and generates heat, so that the bimetal 19 connected to the heater is thermally deformed.

When the bimetal 19 is thermally deformed and curved to the left in the drawing, the bimetal 19 is connected to the shooter bar 30 installed in close proximity to the bimetal. In this state, the bimetal 19 is continuously deformed and bent by the overload. Since the 30 is pushed to the left in the drawing, the shutter bar is rotated clockwise in the drawing while compressing the second elastic member 31.

When the shooter bar 30 rotates in the clockwise direction, the stopper 33 formed on the shooter bar releases the locking state of the locking protrusion 32 formed on the shooter 25, so that the shooter 25 is formed of a first elastic member ( By the elastic force of 24, it is quickly rotated clockwise in the drawing.

When the shooter 25 hits the cross bar 17 while rotating as shown in FIG. 4A, the latch holder 16 is pushed by the latch holder 16 while the cross bar 17 rotates counterclockwise. Release the jam state.

When the latch holder 16 releases the latch state of the latch 14, one end of the upper link 12 is supported by the latch 14, and the handle pin is connected to the link pin 10 to which the other end of the upper link is coupled. The toggle spring 13, which is tensioned and has a compressive force according to the rotation of 8), is fixed, and the link pin 10 is pulled upward (counterclockwise about the latch pin) by the restoring force of the toggle spring 13. Since the upper link 12 and the toggle link 11 are folded to perform a trip operation, the movable contact 5 is opened from the fixed contact 4 to stop supplying power to the load side.

That is, when the locking state of the shooter 25 held by the shooter bar 30 is released due to the thermal deformation of the bimetal 19, the shooter 25 rotates toward the crossbar 17 while the crossbar 17 is rotated. Since it hits quickly, it cuts off the power supply on the load side quickly.

In this way, after the trip operation is completed and the power supply on the load side is stopped, the overload factor on the overload side should be removed and the power supplied again.

To this end, the shooter assembly 22 needs to be reset to an initial state. The reset operation of the shooter assembly 22 is performed by the blade piece 8a when the handle 8 is returned to the reset position as described above. Is rotated counterclockwise to complete.

On the other hand, when the rated current on the load side is to be maintained at 350 A due to the expansion of peripheral devices, the shooter assembly 22 that is already mounted is suited to the capacity without disconnecting the circuit breaker installed in the switchboard (not shown). Replace with a shooter assembly.

To this end, the protective cover 29 is opened from the cover 2, and then the pressing protrusions 28 exposed to both sides of the shooter housing 23 are pressed to hold the elastic pieces 27 from the locking jaws formed on both sides of the main surface space. Since the locking protrusion 27a is pulled out, the lifter housing 23 is lifted upward, so that the shooter assembly 22 can be separated.

After removing the 250 A shooter assembly 22 used in this way, the capacity of the rated current described on the name plate 35 is visually identified, and the 350 A shooter assembly is selected and inserted into the space formed in the cover 2. Just do it.

Accordingly, since the locking projection 27a formed on the elastic piece 27 is supported by the locking jaw, the shooter assembly 22 is not separated from the cover 2.

After the 350 A shooter assembly is mounted in the above-described operation, the distance G between the bimetal 19 and the shooter bar 30 is farther than that of the 250 A shooter assembly, and the shooter bar 30 is resilient. Since the elastic modulus of the second elastic member 31 to be installed is also large, a tripping operation occurs when the curvature amount of the bimetal 19 increases, that is, when the load is larger than 250 A.

As described above, the degree of varying the rated current on the load side by the shooter assembly 22 can be up to about 400 A in the case of 250 A.

As described above, the present invention has the following advantages over the conventional apparatus.

First, if you want to control the rated current of the load side by the expansion of the installation, select the shutter assembly suitable for the rated current and replace it, so it is easy to adjust the rated current.

In other words, even if the user does not exactly know the amount of the cross bar gap G according to the rated current, it is appropriately selected according to the capacity of the rated current described on the name plate 35 of the shooter assembly and mounted on the cover 2. If the cycle is changed, the capacity of the rated current is changed, so there is no need to replace the circuit breaker in use with a new breaker.

Second, if an overcurrent exceeding the rated current flows on the load side, even if the bimetal 19 is gradually deformed, the deformation due to the curvature of the bimetal is converted into an impact force by the shooter 25 and transmitted to the cross bar 17, so that the rapid Closure becomes possible, thus extending the life of the peripheral.

In particular, when a circuit breaker is installed in a workplace where a lot of dust is generated, even when a foreign material such as dust is caught inside, the shooter 25 impacts the cross bar 17 so that the latch holder 16 and the latch 14 are caught. Since the state is released quickly, overcurrent flows continuously to the converter to prevent the device from being burned and the occurrence of a fire.

Claims (15)

A cross bar 17 for releasing the latching state of the latch 14 and the latch holder 16 is rotatably installed in the case 1, and the cross section of the cross bar is curved toward the cross bar when an overcurrent is applied to the load side. In the wiring breaker provided by connecting the bimetal 19 to be connected to the heater 18, the bending motion of the bimetal is switched between the cross bar 17 and the bimetal 19 by the striking motion, and the cross bar 17 is opened. Demonstration tripping device of the circuit breaker with the instantaneous hitting male assembly 22 is installed. The demonstration trip device of a circuit breaker according to claim 1, wherein the shooter assembly (22) is detachably fitted to the cover by the locking means from the outside of the cover (2). 3. The pair of elastic pieces according to claim 2, wherein the locking means has a locking jaw formed to correspond to both side walls of the space of the cover 2, and a hook 27a formed on the shooter assembly 22 to be supported by the locking jaw. Demonstration trip device of a circuit breaker consisting of (27). The demonstration trip device of a circuit breaker according to claim 3, wherein the push protrusion (28) is formed to be exposed to the outside on the upper side of the hook (27a) formed on the elastic piece (27). The demonstration trip device of a circuit breaker according to claim 1, wherein a protective cover (29) for closing the shooter assembly (22) on the upper surface of the cover (2) is opened and closed. A cross bar 17 for releasing the latching state of the latch 14 and the latch holder 16 is rotatably installed in the case 1, and the cross section of the cross bar is curved toward the cross bar when an overcurrent is applied to the load side. In the wiring circuit breaker in which a bimetal 19 to be connected to the heater 18 is installed, a shutter housing coupled to the outside is exposed on the cover 2 positioned between the crossbar 17 and the bimetal 19. 23) and the first elastic member 24 is elastically installed on the shooter housing so as to have a force to be rotated to the cross bar side, when the over current is energized to the load side, the cross bar 17 is momentarily blown and tripped, and at reset The second elastic member 31 has a shooter 25 which is pressed by the blade piece 8a of the handle 8 and reduced to an initial state, and has a force to be rotated to the bimetal 19 side of the shooter housing 23. Is installed elastically so that normal current The shooter bar 30 which maintains the jammed state of the shooter 25 when being transferred and releases the jammed state with the shooter 25 as the bimetal 19 is bent due to the energization of overcurrent, and when normal current is energized to the load side. Demonstration tripping device for a circuit breaker consisting of a locking means for keeping the shoter and the shooter bar locked. The method of claim 6, wherein the locking means is formed in the shooter 25 to extend horizontally on one side and the locking projection 32, and is formed to extend vertically on one side of the shooter housing so that the normal current is applied to the load side when the locking projection ( Demonstration tripping device of the circuit breaker consisting of a stopper (33) on which the 32 is mounted. 7. The locking piece (34) according to claim 6, wherein the locking piece (34) is formed in the shooter bar (30) so that the locking piece (34) is applied when the shooter bar (30) is forced to rotate counterclockwise by the second elastic member (31). ) Is a demonstration trip device for a circuit breaker connected to the bottom of the shooter housing (23) to maintain a vertical state. 7. The wiring line according to claim 6, wherein the elastic modulus of the cross bar gap (G) and the second elastic member (31), which are the distance between the bimetal (19) and the shooter bar (30), are respectively varied according to the capacity of the rated current. Demonstration tripping device in the breaker. The demonstration trip device of a circuit breaker according to claim 6, wherein a name plate (35) is provided on the upper surface of the shooter housing (23) indicating a rated current of the circuit breaker. The demonstration trip device of a circuit breaker according to claim 6, wherein the elastic modulus of the first elastic member (24) is set larger than the elastic modulus of the second elastic member (31). The demonstration trip device of a circuit breaker according to claim 6, wherein the shooter housing (23) is detachably coupled to the cover (2) from the outside of the cover (2) by locking means. 13. The pair of elastic pieces according to claim 12, wherein the locking means has a locking jaw formed to correspond to both side walls of the space of the cover 2, and a hook 27a formed on the shooter housing 23 to be supported by the locking jaw. Demonstration trip device of a circuit breaker consisting of (27). The demonstration trip device of a circuit breaker according to claim 13, wherein a push protrusion (28) is formed on the upper side of the hook (27a) formed on the elastic piece (27) to be exposed to the outside. The demonstration trip device of a circuit breaker according to claim 6, wherein a protective cover (29) for closing the shooter housing (23) on the upper surface of the cover (2) is opened and closed.

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