KR100652236B1 - Instant trip apparatus of molded case circuit breaker - Google Patents

Abstract

The present invention relates to a tripping device for a circuit breaker, comprising: a fixed contactor, a movable contactor rotatable to a position in contact with and separated from the fixed contactor, and a switch for moving a circuit to open or close a circuit by moving the movable contactor to the contacting position or a disconnecting position A hook, a handle connected to the opening / closing mechanism part for manually operating the opening / closing mechanism part, and a trip for detecting an overcurrent, instantaneous current or short-circuit current at the power supply side and inducing a trip to cut off the power supply to the opening / closing mechanism part. And a circuit breaker for extinguishing an arc generated when the circuit is cut off, wherein the trip unit is fixed to the main circuit and has a fixed magnet that generates an electromagnetic force when an abnormal current is generated; Amateurs that are installed to be opposed to and spaced apart from each other A crossbar installed to rotate by the rotation of the amateur, a shooter supported by the crossbar and connected to the opening / closing mechanism and tripping the opening / closing mechanism, and in contact with one side of the amateur, between the fixing magnet and the amateur. And an instant dial for rotating the armature so as to adjust an interval of the instant bar, and an instant dial for contacting the other side of the instant bar and rotating the instant bar. Thereby, the forward seating device of the circuit breaker for improving the reliability of the product can be provided by accurately adjusting the distance between the fixed mark net and the amateur by using the instant bar of the trip part.

Description

INSTANT TRIP APPARATUS OF MOLDED CASE CIRCUIT BREAKER}

1 is a cross-sectional view showing the structure of a conventional circuit breaker;

2 is a longitudinal cross-sectional view of the trip unit of FIG. 1;

3 is a perspective view showing the structure of a trip part of a circuit breaker according to an embodiment of the present invention;

4a, 4b is an operation of FIG.

5 is a perspective view showing the structure of a trip part of a circuit breaker according to another embodiment of the present invention;

6A, 6B, and 6C are operation diagrams of FIG. 5.

** Description of symbols for the main parts of the drawing **

100: circuit breaker 110, 120: fixed contactor

130: movable contact 140: opening and closing mechanism

150: handle 160: trip part

170: Sohobu 261: Fixed mark net

262: Amateur 263: Shooter

264 crossbar 265 instant bar

266: Instant Dial 267: Instant Spring

268: amateur supporter 269: tripyeonyeon

The present invention relates to a forward tripping device for a circuit breaker, and more particularly, a circuit breaker for improving the reliability of a product by accurately adjusting a gap between a fixed mark net and an amateur by using an instant bar of a trip part. It relates to a pure sheet of the apparatus.

In general, the circuit breaker is an electrical device that protects the circuit and the load by automatically cutting off the circuit in the event of an electrical overload or short circuit. The circuit breaker is largely connected to the terminal part connecting the power supply side and the load side, the mechanism part to open and close the contact between the stator and the mover in the wiring breaker, and to detect the occurrence of overcurrent, instantaneous current and short circuit current at the power supply side so that the power supply can be cut off. It consists of a trip part which induces a trip.

Therefore, the circuit breaker is a function to protect the load and the circuit by blocking the abnormal current, that is, over current, instantaneous current and short-circuit current between the power supply and the load.

On the other hand, when abnormal current occurs, regardless of artificial opening and closing, the circuit breaker recognizes this and automatically cuts off the current. This is called a normal trip. Trip generated when instantaneous current passes is to sense when the current applied to the circuit breaker is instantaneously applied at a certain magnification of the rated current and trips at a suitable time at a certain magnification. This function is called an instantaneous trip function.

1 is a cross-sectional view showing the structure of a conventional circuit breaker, and FIG. 2 is a longitudinal cross-sectional view of the trip part of FIG.

As shown in these figures, the conventional circuit breaker 100 is largely connected with the fixed contactors 110 and 120 connected to the power supply side and the load side, and the contact with the fixed contacts 110 and 120 (ON) and disconnection (OFF). Or TRIP) and the movable contactor 130 which is rotatable to the position to be moved, and the opening and closing mechanism 140 for opening and closing the circuit by moving the movable contactor 130 to the contacting position or the separating position, and connected to the opening and closing mechanism 140. The handle 150 for manually operating the switch mechanism 140 and the trip unit 160 which detects when an overcurrent, instantaneous current or short-circuit current occurs on the power supply side, and induces a trip to cut off the power to the switch mechanism. And extinguishing arcs generated when the circuit is cut off.

The trip unit 160 is fixedly installed in the main circuit and fixed magnet 161 that generates an electromagnetic force when an abnormal current is generated, the fixed magnet 161 is opposed to the fixed magnet 161 and the armature 162 is rotatably installed, and one side The rocker arm 163a is provided and is rotated as the shooter 163 connected to the opening / closing mechanism part 140, the crossbar 164 supporting the shooter 163, and the shooter 163 are rotated. Instant bar 165 for tripping 140, instant dial 166 for rotating the instant bar 165 in surface contact with the instant bar 165, and instant spring for restraining the rotation of the armature 162 ( 167).

The side of the instant dial 165 is provided with a cam surface 166a having a gradually smaller radius along the circumferential direction so that the instant bar 165 can be rotated by the rotation of the instant dial 166. A fastening groove (not shown) is formed to easily rotate the intent dial 166 by using the same.

One end of the instant bar 165 is in contact with the cam surface 166a of the instant dial 166, and the other end of the instant bar 165 is fastened to the instant spring 167. One end of the instant spring 167 is connected to the instant bar 165 and the other end is connected to the transbar 168 to adjust the distance between the fixed magnet 161 and the amateur 162, the transbar 168 Is in contact with one side of the amateur 162.

By this configuration, the electromagnetic force generated between the fixed magnet 161 and the amateur 162 when the abnormal current is generated increases in inverse proportion to the distance between the fixed magnet 161 and the amateur 162, so that the user trips at a higher current. To cause this to occur, rotate the instant dial 166 so that the radius of the cam surface 166a and the one side of the instant bar 165 are in contact with each other so that the instant bar 165 is rotated and the other side of the instant bar 165 is lower. Since the instant spring 167 is compressed, and the transbar 168 connected to the other side of the instant spring 167 is rotated to move the armature 162 to the fixed magnet 161, the fixed magnet 161 And the gap between the amateur 162 becomes narrow.

On the contrary, in order to cause a trip at a lower current, the user rotates the instant dial 166 so that the radius of the cam surface 166a and the one side of the instant bar 165 come into contact with each other. Since the other side of the bar 165 moves upward, the instant spring 167 is tensioned, and the transbar 168 connected to the other side of the instant spring 167 rotates to fix the armature 162 to the fixed magnet 161. Since it moves to the opposite side of the gap between the fixed magnet 161 and the amateur 162 is opened.

After setting the magnitude of the abnormal current in which the trip occurs in the above manner, when an abnormal current such as a short circuit current is generated on the line, an electromagnetic force is generated in the fixed magnet 161, in which case the fixed magnet 161 The armature 162 is attracted by the attraction force by the electromagnetic force of and rotates in the counterclockwise direction to contact the fixed magnet 161. At this time, since the armature 162 is supported by the instant spring 167, the above-mentioned electromagnetic force should act as a force greater than the elastic force of the instant spring 167.

At the same time, the transbar 168 connected to the instant spring 167 rotates clockwise, and one end of the transbar 168 presses the lower end of the crossbar 164 and rotates the crossbar 164 clockwise. As a result, the restrained state of the shooter 163 restrained by the crossbar 164 is released, and the opening and closing mechanism 140 is tripped.

However, in the conventional tripping device of the circuit breaker, the distance between the fixed magnet 161 and the amateur 162 is adjusted by using the elastic force of the instant spring 167, so that the spring is fixed due to the deviation of the instant spring 167 itself. It is not easy to accurately adjust the distance between the magnet 161 and the amateur 162, and also change the load value of the instant spring 167 to adjust the distance between the fixed magnet 161 and the amateur 162. There is a problem that there is not enough space available.

Accordingly, an object of the present invention is to provide a forward circuit breaker for a circuit breaker that can improve the reliability of the product by accurately adjusting the distance between the fixed mark net and the amateur by using the instant bar of the trip part.

According to the present invention, there is provided a fixed contactor, a movable contactor rotatable to a position in contact with and separated from the fixed contactor, an opening / closing mechanism part for opening and closing a circuit by moving the movable contactor to the contacting position or the separating position; A handle connected to the switch mechanism part for manually operating the switch mechanism part, a trip part which detects when an overcurrent, instantaneous current or short circuit current occurs on the power supply side and induces a trip to cut off the power to the switch mechanism part, a circuit The circuit breaker comprising a arc extinguishing unit for extinguishing the arc generated when the trip is cut off, wherein the trip unit is fixed to the main circuit and the fixed magnet that generates an electromagnetic force when an abnormal current is generated, and a fixed distance from the fixed mark net An armature that is opposed to and is rotatably installed, and a rotation of the armature A crossbar installed to rotate by the crossbar, a shooter supported by the crossbar and connected to the opening / closing mechanism part to trip the opening / closing mechanism part, and in contact with one side of the amateur to adjust the distance between the fixed magnet and the amateur. And an instant dial for rotating the armature, and an instant dial for contacting the other side of the instant bar and driving the instant bar.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

3 is a perspective view illustrating a structure of a trip unit of a circuit breaker according to an exemplary embodiment of the present invention, and FIGS. 4A and 4B are diagrams illustrating an operation of FIG. 3, and FIG. 5 is a diagram illustrating a circuit breaker according to another embodiment of the present invention. 6 is a perspective view illustrating the structure of the trip part, and FIGS. 6A, 6B, and 6C are operation diagrams of FIG. 5.

As shown in these figures, the forward-slip device of the circuit breaker according to the embodiment of the present invention is movable to a position where the fixed contactors 110 and 120 are in contact with and separated from the fixed contactors 110 and 120. Opening and closing mechanism 140 for opening and closing the circuit by moving the contactor 130, the movable contact 130 to the contact position or the separation position, and connected to the opening and closing mechanism 140, for manually operating the opening and closing mechanism 140 The handle 150 and the trip unit 160 which detects when an overcurrent or instantaneous current or a short circuit current occurs on the power supply side and induces a trip to cut off the power supply to the switch mechanism 140, and a circuit generated when the circuit is cut off. In the circuit breaker including the arc extinguishing unit 170 for extinguishing the arc, the trip unit 160 is fixed to the main circuit, the fixed magnet 261 and the fixed mark net (2), in which electromagnetic force is generated when an abnormal current is generated. 261) and The armature 262 which is opposed to each other at a predetermined interval and is rotatably installed, the crossbar 264 installed to rotate by the rotation of the armature 262, and the opening and closing mechanism 140 are supported by the crossbar 264. It is connected to the shooter 263 for tripping the opening and closing mechanism 140 and the side of the armature 262 in contact with one side of the fixed magnet 261 and the armature 262 to drive the armature 262 to rotate The instant bar 265 is configured to include an instant dial 266 in contact with the other side of the instant bar 265 to rotate the instant bar 265.

The fixed contactors 110 and 120 are composed of a power supply side fixed contactor 110 connected to a power supply side and a load side fixed contactor 120 connected to a load side.

The side of the instant dial 266 is provided with a cam surface 266a having a gradually smaller radius along the circumferential direction so that the instant bar 265 can be rotated by the rotation of the instant dial 266. A fastening groove (not shown) is formed to easily rotate the intent dial 265 by using.

One end of the instant bar 265 is in contact with the cam surface 266a of the instant dial 266 and the other end is in contact with one side of the amateur 262 so that the distance between the fixed magnet 261 and the amateur 262 can be adjusted. .

The amateur 262 is rotatably coupled to the bottom surface of the trip unit 160 so that the armature 262 can be rotated and approached to the fixed magnet 261 by the electromagnetic force generated by the fixed magnet 261. A supporter 268 for supporting is provided. One end of the instant spring 267 is connected to the upper end of the armature 262 and extends downward so that the armature 262 can be returned to the normal current after the occurrence of the abnormal current, and the other end of the instant spring 267 is the amateur. It is connected to the support 268.

Hooks are provided at both ends of the instant spring 267, and the hook on one side is fixedly coupled to the coupling protrusion 262a extending along the length direction of the amateur 262 at the top surface of the amateur 262, and the other hook is Screwed to the lower side of the amateur porter 268 is fixedly coupled to the set screw 268a protruding along the plate surface direction of the amateur porter 268.

With this configuration, the electromagnetic force generated between the fixed magnet 261 and the amateur 262 at the time of occurrence of the abnormal current increases in inverse proportion to the distance between the fixed magnet 261 and the amateur 262, so that the user trips at a higher current. To cause this to occur, rotate the instant dial 266 so that the radius of the cam surface 266a and the one side of the instant bar 265 are in contact with each other, so that the other side of the instant bar 265 is rotated toward the amateur 262 side. The gap between the fixed magnet 261 and the armature 262 is narrowed by pushing the 262, and the instant spring 267 is further tensioned so that the elastic force is large.

In addition, when the set screw 268a is rotated counterclockwise to increase the current generated by the trip, the set screw 268a is moved to the opposite side to the armature 262 so that the instant spring 267 is tensioned, so the elastic force acts greatly. Trips occur at higher currents.

On the contrary, if the user wants to cause a trip at a lower current, the instant dial 266 is rotated so that the radius of the cam surface 266a and the side of the instant bar 265 are in contact with each other of the instant bar 265. Since the side is rotated to the opposite side of the amateur 262, the distance between the fixed magnet 261 and the amateur 262 is separated by the tension of the instant spring 267 connected to the amateur 262, the instant spring 267 Compresses and reduces the elastic force acting.

In addition, when the set screw 268a is rotated clockwise to lower the current generated by the trip, the set screw 268a moves to the armature 262 and the instant spring 267 is compressed, so that the elastic force acts small, so at a low current. A trip occurs.

After setting the magnitude of the abnormal current in which the trip occurs in the above manner, when an abnormal current such as a short circuit current is generated on the line, an electromagnetic force is generated in the fixed magnet 261, at which time the fixed magnet 261 The armature 262 is attracted and rotated counterclockwise by the attraction force due to the electromagnetic force of the magnetic force, and comes into contact with the fixed magnet 261. At this time, since the armature 262 is supported by the instant spring 267, the above-mentioned electromagnetic force should act to be larger than the elastic force of the instant spring 267.

At the same time, the transbar 168 connected to the instant spring 167 rotates clockwise, and one end of the transbar 168 presses the lower end of the crossbar 164 and rotates the crossbar 164 clockwise. As a result, the restrained state of the shooter 163 restrained by the crossbar 164 is released, and the opening and closing mechanism 140 is tripped.

FIG. 5 illustrates a structure of a trip unit according to another embodiment of the present invention, and a detailed description thereof will be omitted for the same parts as those of the exemplary embodiment.

In the structure of the trip part according to another embodiment of the present invention, one side of the armature 262 so that the trip occurs sequentially in the power supply side fixed contactor 110 and the load side fixed contactor 120 by delaying the rotational movement of the armature 262. A tension plate 269a is provided which is coupled to the pivotal central axis and whose other side extends to a predetermined length along the longitudinal direction of the armature 262.

The tension plate 269a coupled to the pivot center axis of the armature 262 is provided with a torsion spring. One side of the torsion spring is in contact with the side of the armature 262 and the other side is upper side along the longitudinal direction of the armature 262. And a tripping weight 269 having a predetermined mass is coupled to an end thereof.

The plate surface of the armature 262 which is in contact with the trip button 269 has a rectangular through-hole equal to the cross section of the trip button 269 so that the trip button 269 can press the crossbar 264 when an abnormal current occurs. Formed.

With this configuration, as described in the operation of one embodiment, after setting the magnitude of the abnormal current generated by the trip, when an abnormal current such as a short circuit current is generated on the line, an electromagnetic force is applied to the fixed magnet 261. At this time, the armature 262 is attracted by the attraction force by the electromagnetic force of the fixed magnet 261 and rotated counterclockwise to come into contact with the fixed magnet 261. At this time, since the armature 262 is supported by the instant spring 267, the electromagnetic force should act as a force greater than the elastic force of the instant spring 267.

At the same time, the armature 262 is rotated toward the fixed magnet 261 side because the elastic force is applied to the opposite side of the fixed magnet 261 due to the tension plate 269a supported by the tripping weight 269. After the contact with the fixed magnet 261 is completed by the 262, the tripping lever 269 is rotated by the elastic force of the torsion spring installed at the lower end of the tension plate 269a to press the lower end of the crossbar 264 and the crossbar 264. ) Is rotated in a clockwise direction, thereby restraining the restraint state of the shooter 263 that has been restrained by the crossbar 264 to complete the trip of the opening / closing mechanism 140.

As described above, according to the present invention, there is provided a fixed contactor, a movable contactor rotatable to a position in contact with and separated from the fixed contactor, and an opening / closing mechanism part for opening and closing a circuit by moving the movable contactor to the contacting position or the separating position; A handle connected to the opening and closing mechanism to manually operate the opening and closing mechanism, a trip unit for detecting trips when an overcurrent, instantaneous current, or short-circuit current occurs on the power supply side, and inducing a trip to cut off the power to the opening and closing mechanism; A circuit breaker comprising a arc extinguishing unit for extinguishing an arc generated when a circuit is cut off, wherein the trip unit is fixed to a main circuit to generate an electromagnetic force when an abnormal current is generated, and to the fixed mark net at a predetermined interval. An armature opposite to and rotatably installed, with said flax A crossbar installed to rotate by rotation of the fish, a shooter supported by the crossbar and connected to the opening / closing mechanism part to trip the opening / closing mechanism part, and in contact with one side of the amateur, the distance between the fixed magnet and the amateur By providing an instant bar for rotating the armature and an instant dial for contacting the other side of the instant bar and driving the instant bar, the distance between the fixed mark net and the arm using the instant bar of the trip part is provided. Provided is a forward tripping device for a circuit breaker that can improve the reliability of the product by adjusting the accuracy.

Claims (7)

A fixed contactor, a movable contactor which is rotatable to a position in contact with and separated from the fixed contactor, an opening and closing mechanism part for opening and closing a circuit by moving the movable contactor to the contacting position or a separating position; Handle for manual operation, trip part for detecting trip when the over current, instantaneous current or short-circuit current occurs on the power supply side to cut off the power to the switch mechanism part, and extinguishes the arc generated when the circuit is cut off In the circuit breaker which comprises the arc-extinguishing part to make, The trip part is fixed to the main circuit and is fixed to the magnet to generate an electromagnetic force when an abnormal current occurs, the fixed mark net is opposed to the fixed interval and the arm is installed to be rotatable, it is installed to rotate by the rotation of the amateur A crossbar, a supporter supported by the crossbar and simultaneously connected to the opening / closing mechanism part to trip the opening / closing mechanism part, and driving the armature to be in contact with one side of the amateur to adjust the distance between the fixed magnet and the amateur. And an instant dial for contacting the other side of the instant bar and driving the instant bar to rotate. The method of claim 1, And a cam surface having a gradually smaller radius along the circumferential direction on the side of the instant dial in contact with the instant bar so as to rotate the instant bar. The method of claim 1, One side of the amateur is provided with an armature supporter for supporting the armature, one end is connected to the armature and the other end is connected to the coupling means provided on the armature support to return the armature is further installed A forward seating device for a circuit breaker characterized by the above-mentioned. The method of claim 3, The coupling means is a forward seating device for a circuit breaker, characterized in that the set screw is screwed to be movable along the thickness direction of the amateur porter on one side of the amateur porter to adjust the elastic force of the instant spring. The method of claim 1, The fixed contactor is a forward seating device of a circuit breaker, characterized in that the power supply side fixed contact is connected to the power supply side and the load side fixed contactor is connected to the load side. The method of claim 5, A delay circuit for circuit breaker for a circuit breaker, characterized in that a trip delay means is provided on one side of the amateur to sequentially generate trips at the power supply side fixed contactor and the load side fixed contactor by delaying the rotation of the armature. The method of claim 6, The trip delay means is provided with a torsion spring coupled to the pivotal axis of the armature in contact with the plate surface of the armature at one side, and the other side is a tension extending from the torsion spring to a predetermined length along the longitudinal direction of the armature. A plate and a forward tripping device for a circuit breaker for a circuit breaker, comprising: a tripping pin fixedly coupled to an end of the tension plate and having a predetermined mass.

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