JP4313383B2 - Instantaneous trip mechanism for circuit breaker for wiring - Google Patents

Description

  The present invention relates to a circuit breaker for wiring, and in particular, a mechanism for adjusting the sensitivity of trip current is simple and can provide a certain trip current sensitivity for each product, thereby manufacturing a reliable circuit breaker. The present invention relates to an instantaneous trip mechanism of a circuit breaker for wiring.

  Generally, a circuit breaker for wiring protects the circuit and electrical load equipment by automatically shutting off the circuit when an electrical overcurrent flows through the circuit between the power supply and the electrical load or when a short circuit current flows. It is an electric device to do.

  The circuit breaker for wiring includes a terminal unit connected to a power source or an electric load, a stationary contact and a movable contact electrically connected to the terminal unit, and the movable contact is brought into contact with the fixed contact. An open / close mechanism that opens and closes the circuit by moving it to a position or a position separated from the fixed contact, and when a large current exceeding a normal current flows through the circuit, the trip position that detects this and opens the circuit And an instantaneous trip mechanism that triggers the opening and closing mechanism to operate.

The circuit breaker configured as described above is connected to the circuit to open and close the circuit between the power source and the electrical load, or when an abnormal current flows through the circuit, Usually used as a means to protect a circuit.
On the other hand, unlike manually operating the open / close mechanism to the open / close position of the circuit, when an abnormal current flows in the circuit, the circuit breaker for wiring operates to a position to automatically shut down the circuit by detecting this However, such an operation is called a trip operation.

  Further, when the current flowing through the circuit is a very large current corresponding to several times the rated current, a function of instantaneous trip is required in which the circuit breaker for wiring senses this and instantaneously performs a trip operation.

The present invention relates to an advanced mechanism for an instantaneous trip of such a circuit breaker. Hereinafter, conventional techniques related to the instantaneous trip mechanism of such a circuit breaker will be described.
The conventional technology to be introduced is based on the knowledge of the inventor, and a specific source of related documents cannot be presented.

  FIG. 5 is a sectional view showing the structure of a general circuit breaker, and FIG. 6 is a longitudinal sectional view of a conventional instantaneous trip mechanism.

  As shown in FIGS. 5 and 6, a general circuit breaker 100 includes fixed contacts 110 and 120 connected to a power source or an electrical load, and contacts these fixed contacts 110 and 120 (when ON). And a movable contact 130 rotatable to a position for separation (OFF or trip), an opening / closing mechanism 140 for moving the movable contact 130 to the contact position or separation position to open / close the circuit, and the opening / closing mechanism 140 When a large current exceeding a normal current flows through the handle 150 for manually operating the opening / closing mechanism 140 and the circuit between the power source and the electric load, the circuit is opened by detecting this. The instantaneous trip mechanism 160 that triggers the opening and closing mechanism to operate at a trip position and the movable contact 130 are separated from the fixed contacts 110 and 120. When composed of an arc-extinguishing mechanism 170 for extinguishing arc generated between the contacts.

Hereinafter, a detailed configuration of the instantaneous trip mechanism 160 will be described as an example of the prior art with reference to FIG.
As shown in FIG. 6, the conventional instantaneous trip mechanism 160 is fixedly installed on a conductor between the fixed contacts 110 and 120 and the terminal, and when a large current flows through the circuit, a magnetic force proportional to the magnetic current is generated. A fixed electromagnet 161 that generates an attractive force, and can be turned to a position close to the fixed electromagnet 161 or a position separated from the fixed electromagnet 161 so as to face the fixed electromagnet 161, and trips to the upper end. And an armature 162 having a working portion 162a for driving. The conventional trip mechanism 160 is provided with a rocker arm 163a at one end and a shooter 163 that is drivingly connected to the opening / closing mechanism 140 at the other end, and can be rotated to a position where the shooter 163 is locked or released. The armature 162 has a crossbar 164 that can be rotated to a position where the shooter 163 is released by pressurizing the action portion 162a, and an upper surface that is exposed to the upper part of the circuit breaker and rotated by the user. And an adjustment dial 166 having a side surface formed of the cam surface 166a and capable of adjusting the sensitivity of the trip current of the instantaneous trip mechanism. Further, the conventional trip mechanism 160 has an upper end portion that contacts the cam surface 166a of the adjustment dial 166 and a lower end portion for transmitting power, and the contact on the cam surface 166a due to the rotation of the adjustment dial 166. A first power transmission bar 165 that can be rotated by a point displacement, and a position that contacts the upper end 162a of the armature 162 in order to transmit the power from the first power transmission bar 165 to the armature 162. A second power transmission bar 168 installed at the upper end, and an upper end portion supported by the first power transmission bar 165 and a lower end portion supported by the second power transmission bar 168, and the power from the first power transmission bar 165 Is transmitted to the second power transmission bar 168 and at the same time, the relative position between the adjustment dial 166 and the first power transmission bar 165 and the second power transmission bar 165. Reaches further includes a bar 168 and a spring 167 to maintain the adjusted position of the relative position of the armature 162, the.

  A screw driver connection groove (not shown) is provided on the upper surface of the adjustment dial 166 so that the user can adjust the sensitivity of the trip current of the circuit breaker. The first power transmission bar 165, which is composed of a cam surface 166a having a changing radius and contacts the cam surface 166a, rotates in conjunction with the contact position on the cam surface 166a.

  The armature 162 is urged in the direction approaching the fixed electromagnet 161 by a torsion spring (not indicated) installed at a lower portion, and the upper end portion 162a of the armature 162 is stopped by the second power transmission bar 168. The armature 162 can maintain a state separated from the fixed electromagnet 161.

The trip current sensitivity adjustment operation of the conventional instantaneous trip mechanism for a circuit breaker configured as described above is as follows.
The sensitivity to the trip current depends on the distance between the fixed electromagnet 161 and the armature 162. That is, the sensitivity becomes sensitive when the distance is short, and becomes insensitive when the distance is long. Therefore, when the distance is adjusted close, the trip mechanism becomes sensitive enough to start a trip operation even when a normal current, that is, a current close to the rated current flows in the circuit, and when the distance is adjusted far away, The trip mechanism only trips when a current that is much larger than the rated current flows through the circuit.

  Therefore, when the adjustment dial 166 is rotated clockwise in order to adjust the sensitivity to the trip current sensitively, the upper end of the first power transmission bar 165 comes into contact with the cam surface 166a at a position where the radius is large. The first power transmission bar 165 rotates in the clockwise direction. As a result, the spring 167 descends to release the pressure, so that the second power transmission bar 168 rotates in the clockwise direction, whereby the armature 162 is moved by the urging force of the torsion spring (not shown). By approaching the fixed electromagnet 161 by a distance corresponding to the distance that the second power transmission bar 168 is rotated and moved, the current sensitivity of the circuit that starts the trip operation is adjusted to be more sensitive.

  On the other hand, in order to adjust the sensitivity to the trip current to be insensitive, that is, to adjust the current of the circuit that starts the trip operation to a current much larger than the rated current, the adjustment dial 166 is counterclockwise. When rotating in the direction, the upper end of the first power transmission bar 165 contacts at a position where the radius of the cam surface 166a is small, and the first power transmission bar 165 rotates counterclockwise. As a result, the spring 167 rises and pressurizes, whereby the second power transmission bar 168 rotates counterclockwise, thereby overcoming the urging force of the torsion spring (not shown) and the armature 162 is The second power transmission bar 168 is separated from the fixed electromagnet 161 by a distance corresponding to the distance moved by rotating counterclockwise. Thus, the current sensitivity of the circuit that initiates the trip operation is adjusted to be less sensitive, i.e., to operate for a larger circuit current.

The trip operation of the conventional instantaneous trip mechanism will be described.
As described above, adjustment of the circuit current at which the trip mechanism starts tripping, i.e., short circuit current, which is large enough to reach the circuit several times the rated current after the trip sensitivity is adjusted, etc. When an abnormal current flows, the fixed electromagnet 161 is magnetized by such a large current and generates a large magnetic attractive force. At this time, the magnetic attractive force of the fixed electromagnet 161 is much larger than the braking force of the second power transmission bar 168 by the spring 167, so that the action part 162 a of the armature 162 pushes the second power transmission bar 168. Rotate counterclockwise and hit the lower end of the cross bar 164. Next, the crossbar 164 is rotated clockwise by the action of the acting portion 162a of the armature 162, so that the locked state of the rocker arm is released and the shooter 163 is rotated. Thereafter, the opening / closing mechanism 140 of FIG. Trigger to drive to trip position. Therefore, the movable contact 130 that is drivingly connected to the opening / closing mechanism 140 is separated from the fixed contacts 110 and 120 by the driving of the opening / closing mechanism 140, and the circuit is disconnected.

  However, such a conventional trip mechanism for a circuit breaker has a complicated structure and maintains the distance between the fixed electromagnet 161 and the armature 162 using the elastic force of the spring 167. In mass production, the elastic coefficient of the spring 167 is not constant, and therefore the interval between the fixed electromagnet 161 and the armature 162 may vary from product to product even when the adjustment dial 166 is rotated to a predetermined angle. Therefore, there is a problem that it is difficult to manufacture a reliable circuit breaker with a constant current value at which the trip operation is started.

  On the other hand, the circuit breaker for wiring is an upper circuit close to the power source, that is, a circuit breaker for circuit switching and circuit protection of the main circuit, that is, a main circuit breaker, and a lower circuit that is branched from the upper circuit and close to the load device In other words, the installation configuration in which the circuit breaker for opening and closing of the secondary circuit and the circuit protection, that is, the circuit breaker for the secondary wiring is double installed is not only for industrial use but also for distribution lines in general households. Many are used. In the circuit protection configuration in which the upper circuit and the lower circuit are duplicated, when the wiring breaker having the instantaneous trip mechanism is assumed that the trip sensitivity is adjusted to the same level, the upper and lower circuits The circuit breaker of this circuit may trip at the same time for an accident current much larger than the rated current, or not only the circuit breaker of the upper circuit may trip. This is not preferable from the viewpoint of the priority of circuit protection in which the load device in the lower circuit is preferentially protected against the accident current and the upper circuit is then protected. Therefore, the circuit breaker for wiring installed in the upper circuit is not preferable. Is required to delay the instantaneous trip from the circuit breaker installed in the lower circuit.

  The present invention has been made to solve such a problem of the conventional technology, and a mechanism for adjusting the sensitivity of the trip current is simple, and can provide a constant trip current sensitivity for each product. It is an object of the present invention to provide an instantaneous trip mechanism for a circuit breaker that enables a reliable circuit breaker to be manufactured.

  It is another object of the present invention to provide an instantaneous trip mechanism for a circuit breaker that can delay an instantaneous trip in a circuit breaker installed in a higher circuit.

In order to achieve such an object, an instantaneous trip mechanism for a circuit breaker according to the present invention is provided with a fixed electromagnet that generates a magnetic force that changes depending on a current flowing in a circuit, and to face the fixed electromagnet. When a large current exceeding a normal current flows through the circuit, the armature is rotatable to a position where the circuit breaker for wiring is tripped by the magnetic force from the fixed electromagnet, and the armature is separated from the fixed electromagnet. A separation spring for urging the armature, an adjustment dial member having a cam surface for adjusting a gap between the armature and the fixed electromagnet, an end portion contacting the cam surface of the adjustment dial member, and the armature The armature is pressed by a position that contacts the cam surface of the adjustment dial. Characterized by comprising a an adjustment bar rotatable to vary the flop. A means for changing the angle between the separation spring and the armature is further connected to the separation spring so that the biasing force of the separation spring can be adjusted.

  The object of the present invention and the instantaneous trip mechanism for a circuit breaker according to the present invention that achieves this object will be more clearly understood from the following detailed description of preferred embodiments with reference to the accompanying drawings.

  By providing an instantaneous trip mechanism for a circuit breaker according to the present invention, a mechanism for adjusting the sensitivity of trip current is simple, and a constant trip current sensitivity can be provided for each product. There is an effect of obtaining an instantaneous trip mechanism of the circuit breaker for wiring that enables the circuit breaker to be manufactured.

  Also, when double circuit breakers are installed in the main circuit close to the power supply side and the sub circuit close to the load side, in the upper circuit, that is, in the circuit breaker installed in the main circuit, the instantaneous trip is There is an effect of obtaining an instantaneous trip mechanism for a circuit breaker that can be delayed from a circuit, that is, a circuit breaker installed in a subcircuit.

  Hereinafter, embodiments of an instantaneous trip mechanism for a circuit breaker according to the present invention will be described with reference to the accompanying drawings. The circuit breaker for wiring to which the instantaneous trip mechanism of the present invention is applied refers to the circuit breaker for wiring shown in FIG. The general configuration of the circuit breaker shown in FIG. 5 is the same as that described above with respect to the prior art, and thus description thereof is omitted to avoid duplication.

First, FIG. 1 is a perspective view showing a configuration of an instantaneous trip mechanism for a circuit breaker according to an embodiment of the present invention.
As shown in FIG. 1, a tripping mechanism for a circuit breaker according to an embodiment of the present invention has a fixed electromagnet 261 that generates a magnetic force that changes depending on a current flowing in a circuit, and is opposed to the fixed electromagnet 261. The armature 262 that is pivotable to a position where the circuit breaker for wiring is tripped by the magnetic force from the fixed electromagnet 261 when a large current exceeding a normal current flows through the circuit, and the fixed electromagnet 261 is separated. A separation spring 267 for urging the armature 262 in the direction to be moved, an adjustment dial member 266 having a cam surface 266a for adjusting a gap between the armature 262 and the fixed electromagnet 261, and the adjustment dial member 266 One end 265a that contacts the cam surface 266a and the other end that contacts the armature 262 Have 265b, including a rotatable adjustment bar 265 to vary the gap (G) pressurizes the armature 262 by a position in contact with the cam surface 266a of the adjusting dial 266. The other end 265 b of the adjustment bar 265 is formed from a bent portion for locking the armature 262.

  In FIG. 1, reference numeral 263 denotes a shooter that triggers the opening / closing mechanism of the circuit breaker to a trip position, reference numeral 264 denotes a crossbar that locks or unlocks the shooter 263, and reference numeral 264a This is a latch portion of the crossbar 264. Reference numeral 264b is a power transmission portion of the cross bar 264 for receiving the rotational force of the armature 262. Reference numeral 262a supports the upper end portion of the separation spring 267 and is engaged with the other end portion 265b of the adjustment bar 265. Therefore, it is a bent part provided at the upper end of the armature 262. The height of the bent portion 262a is determined so as to correspond to the other end portion 265b of the adjusting bar 265, and the armature 262 is prevented from rotating in the clockwise direction, but the tripping operation is performed in the direction of the fixed electromagnet 261. The bending angle is determined so that the counterclockwise rotation sucked by the valve is not hindered.

  The instantaneous trip mechanism for a circuit breaker according to the present invention shown in FIG. 1 is connected to the separation spring 267, and the angle between the separation spring 267 and the armature 262 is adjusted so that the biasing force of the separation spring 267 can be adjusted. Further comprising means for changing. The means for changing the angle between the separation spring 267 and the armature 262 includes an adjustment screw 268a connected to one end of the separation spring 267, and a support member 268 that supports the adjustment screw 268a. . Here, the support member 268 is composed of a plate material in which a screw portion is formed in a through hole through which the adjustment screw 268a passes.

  The armature 262 receives a moment that changes in proportion to the tangent value of the angle between the separation spring 267 and the armature 262 by the elastic force of the separation spring 267. That is, the armature 262 receives a moment that increases as the angle between the separation spring 267 and the armature 262 increases. The moment is separated from the fixed electromagnet 261, that is, in FIG. The moment of direction.

  For example, when the adjustment screw 268a is rotated clockwise by a screw driver, the adjustment screw 268a moves forward through the through hole in which the screw portion of the support member 268 is formed, so that the separation spring 267 and the armature 262 are moved forward. The angle between becomes larger. Therefore, the armature 262 receives a large moment in the direction in which it is separated from the fixed electromagnet 261, that is, in FIG. When the adjusting screw 268a is rotated counterclockwise by a screw driver, the adjusting screw 268a moves back through the through hole in which the threaded portion of the support member 268 is formed, so that the separation spring 267 and the armature The angle between 262 is smaller. Therefore, the armature 262 receives a moment in the direction in which it is separated from the fixed electromagnet 261, that is, in FIG. 1, the clockwise moment, but the moment is small. As described above, the armature 262 receives a moment in the direction in which it is separated from the fixed electromagnet 261, that is, in FIG. 1, but the bent portion 262 a provided at the upper end of the armature 262 is not limited to the adjustment bar 265. Since it is locked to the end portion 265b, the clockwise rotation is stopped.

Meanwhile, a trip sensitivity adjusting operation of the instantaneous trip mechanism for a circuit breaker configured as described above according to an embodiment of the present invention will be described with reference to FIGS. 2A and 2B.
FIGS. 2a and 2b are operation state diagrams showing a main part of a trip current sensitivity adjusting operation of an instantaneous trip mechanism for a circuit breaker according to an embodiment of the present invention. FIG. FIG. 2B is a diagram illustrating a state in which the trip current is adjusted to be insensitive, that is, a state in which the trip start current is increased.

  First, a screw driver is inserted into a screw driver insertion groove (not shown) formed on the upper surface of the adjustment dial 266 in FIG. 1 and rotated clockwise. Next, as shown in FIG. 2a, the adjustment bar 265 rotates in the clockwise direction because the one end 265a of the adjustment bar 265 contacts the portion of the cam surface 266a of the adjustment dial 266 having a large radius. Accordingly, the gap (G) between the armature 262 and the fixed electromagnet 261 is narrowed by overcoming the elastic force of the separation spring 267 shown in FIG. 1 and rotating the armature 262 counterclockwise. Therefore, the trip mechanism trips when the sensitivity of the trip becomes sensitive and a current slightly larger than the rated current flows, for example, a current several tens of percent larger than the rated current.

  On the other hand, a screw driver is inserted into the screw driver insertion groove and rotated counterclockwise. Next, as shown in FIG. 2b, one end 265a of the adjustment bar 265 contacts the portion of the adjustment dial 266 where the radius of the cam surface 266a is small. Therefore, the adjustment bar 265 shown in FIG. 265 rotates counterclockwise. Accordingly, the armature 262 is rotated clockwise by the elastic force of the separation spring 267 shown in FIG. 1, so that the gap (G) between the armature 262 and the fixed electromagnet 261 is widened. Thus, the trip mechanism trips when the trip sensitivity becomes insensitive and a current that is much larger than the rated current, eg, a current that is several times greater than the rated current, flows through the circuit.

The trip operation of the instantaneous trip mechanism for the circuit breaker according to the embodiment of the present invention will be described with reference to FIG.
As described above, adjustment of the circuit current at which the trip mechanism starts tripping, i.e. after the trip sensitivity has been adjusted, for example, a short circuit current or the like as a large current large enough to reach several times the rated current in the circuit. When such an abnormal current occurs, the fixed electromagnet 261 is magnetized by such a large current and generates a large magnetic attractive force. At this time, since the magnetic attraction force of the fixed electromagnet 261 is much larger than the elastic force of the separation spring 267, the armature 262 rotates counterclockwise in the figure. Next, the crossbar 264 rotates clockwise when the power transmission portion 264b is pushed by the armature 262, and the state where the latch portion of the crossbar 264 locks the shooter 263 is released, and the shooter 263 is Thereafter, the opening / closing mechanism 140 of FIG. 5 is triggered to drive to the trip position. Accordingly, the movable contact 130 drivingly connected to the opening / closing mechanism 140 is separated from the fixed contacts 110 and 120 by the driving of the opening / closing mechanism 140, and the circuit is disconnected.

Meanwhile, a configuration of an instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention will be described with reference to FIG.
The instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention shown in FIG. 3 includes a double circuit breaker close to the power supply side and a circuit breaker close to the load side. When installed in a power supply circuit, it can be applied to the upper wiring circuit breaker. That is, it is a characteristic configuration of another embodiment of the present invention that the trip delay means is provided so that the trip is delayed from the circuit breaker for the lower wiring. In other embodiments of the present invention, other configurations are the same as or similar to the configurations and operations according to the above-described embodiments of the present invention, and thus detailed description thereof is omitted to avoid duplication.

  In FIG. 3, an instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention includes a fixed electromagnet 261 that generates a magnetic force that changes depending on a current flowing in a circuit, and is opposed to the fixed electromagnet 261. When a large current exceeding a normal current flows in the circuit, the armature 262 that can be rotated to a position to trip the circuit breaker by the magnetic force from the fixed electromagnet 261 is separated from the fixed electromagnet 261. A separation spring 267 for biasing the armature 262 in the direction, an adjustment dial member 266 having a cam surface 266a for adjusting the gap (G) between the armature 262 and the fixed electromagnet 261, and the adjustment One end portion 265 a that contacts the cam surface 266 a of the dial member 266 and the armature 262 An adjustment bar 265 that has a touching other end 265b and is rotatable to pressurize the armature 262 and change the gap (G) according to a position contacting the cam surface 266a of the adjustment dial 266. . The other end 265 b of the adjustment bar 265 is formed from a bent portion for locking the armature 262.

  In FIG. 3, reference numeral 263 denotes a shooter that triggers the opening / closing mechanism of the circuit breaker to a trip position, reference numeral 264 denotes a crossbar that locks or unlocks the shooter 263, and reference numeral 264a This is a latch portion of the crossbar 264. Reference numeral 264b denotes a power transmission portion of the cross bar 264 for receiving the rotational force of the armature 262. Reference numeral 262a supports the upper end portion of the separation spring 267 and is engaged with the other end portion 265b of the adjustment bar 265. In order to do this, it is a bent part provided at the upper end of the armature 262. The instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention shown in FIG. 3 is connected to the separation spring 267 and can adjust the biasing force of the separation spring 267 and the armature 262. Further includes means for changing the angle between. The means for changing the angle between the separation spring 267 and the armature 262 includes an adjustment screw 268a connected to one end of the separation spring 267, and a support member 268 that supports the adjustment screw 268a. . Here, the support member 268 is formed of a plate material in which a thread portion is formed in a through hole through which the adjustment screw 268a passes.

  The instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention is characteristically connected to the armature 262 and stops so that the instantaneous trip can be delayed when a large current exceeding the normal current flows through the circuit. It further includes delay units 269 and 269a that utilize inertia.

  These delay units 269 and 269a are fixed at one end to the armature 262, and store (or store) elastic energy when the armature 262 rotates, and store the elastic energy stored after a time delay. A spring element 269a that releases (or releases), and is fixed to the other end of the spring element 269a. When the armature 262 rotates, a stop inertia force is provided to accumulate the spring element 269a and time is accumulated. And a weight 269 that can rotate together with the spring element 269a by elastic energy of the spring element 269a that is released after the delay.

  Here, in order to allow rotational movement of the rotating weight 269, a passing recess 262 b is provided at a corresponding position in the upper part of the armature 262.

Preferably, the spring element 269a is constituted by a plate spring, more specifically, a thin stainless plate.
The spring element 269a may be formed of a normal coil spring that is not a plate spring.

  The weight 269 is fixed and supported by a fixing means such as a hole for inserting the other end of the spring element 269a and a rivet for fixing and supporting the other end of the spring element 269a. A substantially hexahedral weight support member (not indicated), and a metal weight member (not indicated) inserted into the weight support member and fixed and supported. The weight of the weight member of the metal material is determined by a delay time required so that the trip point of the circuit breaker installed in the main circuit is preferably delayed from the circuit breaker installed in the sub circuit.

  The weight 269 is installed at a position facing the central one of the three power transmission portions 264b of the cross bar 264 of FIG. As a relative part of the circuit breaker for tripping the circuit breaker for wiring, that is, as a part for hitting the center of the three power transmission parts 264b of the crossbar 264, the weight 269 Of the three power transmission portions 264b of the cross bar 264, a surface facing the central one is provided.

On the other hand, an operation in which an instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention is tripped with a delay will be described with reference to FIGS.
FIGS. 4a to 4c are operation state diagrams of an essential part of an instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention, and FIG. 4a is a circuit breaker according to another embodiment of the present invention when a normal current is applied. It is an operation state figure of the important section of a dexterous instantaneous trip mechanism.

  In FIG. 4a, when a normal current flows through the circuit in which the circuit breaker is installed, the armature as described above in connection with the instantaneous trip mechanism for the circuit breaker according to an embodiment of the present invention described above. The bent portion 262a (see FIG. 1) of the armature 262 is adjusted by an adjustment bar 265 (see FIG. 1) at a position separated from the fixed electromagnet 261 by a predetermined gap (G) by the separating spring 267 (see FIG. 1). 1) and is held by the other end 265b (see FIG. 1). In such a state, the spring element 269a is maintained in a state of being close to the armature 262 in a state where little elastic energy is stored.

  FIG. 4B shows a state in which the armature is first attracted to the stationary electromagnet side and moved, and the delay weight is temporarily stopped due to the stop inertia, in the instantaneous trip mechanism for the circuit breaker according to another embodiment of the present invention during the trip operation. FIG. In FIG. 4b, when a large current exceeding the normal current flows in the main circuit close to the power supply side where the circuit breaker for wiring is installed, the armature 262 is attracted by the magnetic attractive force from the fixed electromagnet 261 magnetized by the large current. Rotates toward the fixed electromagnet 261. 4b, the spring element 269a is fixed to the armature 262 by the armature 262 rotating in the counterclockwise direction, and one end of the spring element 269a is rotated in the counterclockwise direction together with the armature 262. However, the other end portion of the spring element 269a is temporarily maintained in a stopped state by a stop inertia force by a weight 269 fixed thereto, so that the spring element 269a is bent at an intermediate portion thereof to generate elastic energy. Accumulate power.

  FIG. 4c is a diagram illustrating an instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention during a trip operation, in which a delay weight stopped by a stop inertia is rotated by the elastic force of a plate spring to hit and rotate a crossbar. It is an operation state figure showing a state. Referring to FIG. 4 c, the spring element 269 a that stores the elastic energy by bending the intermediate portion thereof by the inertial force of the weight 269 after a temporary time delay, releases the stored elastic energy. The weight 269 also rotates counterclockwise along the other end of the spring element 269a that is rotated by elastic energy released from the spring element 269a.

  Since the armature 262 is provided with a passage groove 262b to allow movement of the rotating weight 269, the weight 269 passes through the passage groove 262b and hits the power transmission portion 264b of the cross bar 264. Then, the cross bar 264 is rotated in the clockwise direction in the figure. As a result, the circuit breaker installed in the main circuit close to the power source with the instantaneous trip mechanism according to another embodiment of the present invention is slower than the circuit breaker installed in the sub circuit close to the load. In this case, the circuit breaker installed in the sub-circuit may be a normal instantaneous trip mechanism that is not an instantaneous trip mechanism according to another embodiment of the present invention or an instantaneous trip mechanism according to one embodiment of the present invention described above. A circuit breaker with a trip mechanism.

FIG. 1 is a perspective view showing a configuration of an instantaneous trip mechanism for a circuit breaker according to an embodiment of the present invention. FIG. 2 a is a main part operation state diagram illustrating a trip current sensitivity adjustment operation of an instantaneous trip mechanism for a circuit breaker according to an embodiment of the present invention, in which a trip current sensitivity is adjusted to be sensitive, that is, The trip start current is reduced. FIG. 2B is an operation state diagram of the main part similar to FIG. 2A and shows a state where the sensitivity of the trip current is adjusted to make it insensitive, that is, a state where the trip start current is increased. FIG. 3 is a perspective view illustrating a configuration of an instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention. FIG. 4A is an operation state diagram of a main part of an instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention, and illustrates an instantaneous trip mechanism for a circuit breaker according to another embodiment of the present invention when a normal current is applied. It is an operation state figure of an important section. FIG. 4B is an operation state showing a state where the armature is first attracted to the stationary electromagnet side and moved, and the delay weight is stopped by the stop inertia in the instantaneous trip mechanism for the circuit breaker according to another embodiment of the present invention during the trip operation. FIG. FIG. 4c shows a circuit breaker instantaneous trip mechanism according to another embodiment of the present invention during a trip operation in which a delay weight stopped by a stop inertia is rotated by an elastic force of a spring element to hit and rotate a crossbar. It is an operation state figure showing a state. FIG. 5 is a sectional view showing the structure of a general wiring breaker. FIG. 6 is a longitudinal sectional view showing an example of a conventional instantaneous trip mechanism.

Explanation of symbols

261 Fixed electromagnet 262 Armature 263 Shooter 264 Cross bar 264a Latch part 264b Power transmission part 266a Cam surface 266 Adjustment dial member 265 Adjustment bar 267 Separation spring 268a Adjustment screw 268 Support member

Claims (2)

A fixed electromagnet that generates a magnetic force that changes depending on the current flowing in the circuit;
An armature that is provided to face the fixed electromagnet and is rotatable to a position where the circuit breaker is tripped by a magnetic force from the fixed electromagnet when a large current exceeding a normal current flows in the circuit;
A separation spring for biasing the armature in a direction away from the stationary electromagnet;
An adjustment dial member having a cam surface for adjusting a gap between the armature and the fixed electromagnet;
The adjustment dial member has one end contacting the cam surface and the other end contacting the armature, and rotates so as to change the gap by pressing the armature according to the position contacting the cam surface of the adjustment dial. In the instantaneous trip mechanism for circuit breakers , including possible adjustment bars ,
The instantaneous trip mechanism for a circuit breaker for wiring , further comprising means for changing an angle between the separation spring and the armature so as to be connected to the separation spring and adjust a biasing force of the separation spring . Means for varying the angle between the said spaced apart spring armature claim, characterized in that it comprises an adjusting screw which is connected to one end of the separation spring, a support member for supporting said adjustment screw, the 1 The instantaneous trip mechanism for circuit breakers described in 1.

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