JP2015122171A - Magnetic trip display device and circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic trip display device and a circuit breaker which, even when an internal pressure varies in current interruption or a high current is interrupted, prevents an actuator and a component for pressing the actuator from being broken.SOLUTION: The magnetic trip display device comprises: a case which has an opening in the top; an indicator which comprises in its top a display disposed within the opening and is so supported as to be displaceable between a transversely initial position and a transversely operating position in a transverse direction within the case; a coil spring which is compressed and held between the case and the indicator and pressurizes the indicator and the display so as to displace them from the transversely initial position to the transversely operating position; and a latch which is so supported as to be displaceable between a vertically initial position and a vertically operating position in a vertical direction within the case, the latch locking the indicator at the transversely initial position when the latch is at the vertically initial position and unlocking the indicator to displace the indicator and the display to the transversely operating position and to curve the coil spring upward, when the latch is displaced to the vertically operating position.

Description

  The present invention relates to a magnetic trip display device and a circuit breaker.

  The circuit breaker has a function of breaking the circuit when an overload current or a short-circuit current flows in the electric circuit. When an overload current flows, a trip operation is performed by a bimetal disposed at each pole and a thermal interlocking unit that transmits the movement of the bimetal to the mechanism unit. On the other hand, when a short-circuit current flows, the electromagnet portion disposed in each pole and the mug bar that transmits the movement to the mechanism portion operate faster than the bimetal and the thermal interlocking portion, and the trip operation is performed. That is, the content of the trip operation differs depending on whether the cause is an overload current or a short-circuit current.

  Therefore, in order to be able to determine from the outside that the trip operation has been performed due to the short-circuit current, a magnetic trip display as a device that displays that the trip operation (mag trip operation) has been performed by the electromagnet part. The device may be provided in a circuit breaker.

  Conventionally, a magnetic trip display device that is housed in a circuit breaker that performs a trip operation by an electromagnet portion when a short-circuit current flows and displays that the trip operation by the electromagnet portion has been performed, and has a display window And an actuator that is bent at the center in the longitudinal direction, is pivotally supported by the casing at the bent portion, and transmits the movement of the electromagnet section, and is accommodated in the actuator, with one end being in the casing and the other end being in the casing A spring fixed to the actuator and biasing the actuator so that the other end of the actuator is normally in an initial state invisible from the outside of the housing through the display window. The movement of the electromagnet part is transmitted when the circuit breaker performs a trip operation by the electromagnet part. The other end of the eta is through the display window casing Mag trip display the visible operation state from the outside has been disclosed (e.g., see Patent Document 1).

International Publication No. 2013/132598

  However, in the conventional technique described in Patent Document 1, there are a reset pin and an actuator that return the operating actuator to the initial state, and when the circuit breaker trips, the reset pin moves in a direction away from the actuator. Yes. Furthermore, the speed of a component that shifts from the initial state to the operating state by directly pressing the actuator is correlated with the magnitude of the current. Therefore, in high current interruption, the actuator is pushed by the part pushing the actuator faster than the reset pin moves, the actuator is sandwiched between the reset pin and the part pushing the actuator, and the part pushing the actuator pushes the actuator. There is a problem that the actuator and parts that push the actuator are damaged.

  The present invention has been made in view of the above, and is a highly reliable magnetic trip display that does not damage the actuator and the parts that press the actuator even when the internal pressure changes during current interruption or during high current interruption. The object is to obtain a device and a circuit breaker.

  In order to solve the above-described problems and achieve the object, the present invention is housed in a circuit breaker that performs a trip operation by an electromagnet unit when a short-circuit current flows, and the trip operation by the electromagnet unit is performed. A display having an opening at the top and a display unit disposed in the opening at the top, and a lateral initial position and a lateral movement position in the lateral direction in the case. An indicator supported in a displaceable manner, a coil spring that is sandwiched between the case and the indicator in a compressed state and presses the indicator and the display unit so as to be displaced from the lateral initial position to a lateral movement position; The vertical initial position and the vertical operation position are supported so as to be displaceable in the vertical direction, and when the vertical initial position is established, the indicator is locked to the horizontal initial position, Characterized in that it comprises a latch curving upward the coil spring with displacing the indicator and the display unit in the horizontal operating position by solving the locking when displaced to the operating position.

  According to the present invention, a highly reliable magnetic trip display device and circuit breaker are obtained in which the internal pressure change at the time of current interruption or high current interruption does not damage the actuator or parts that press the actuator. There is an effect.

FIG. 1 is a perspective view showing a first embodiment of a magnetic trip display device according to the present invention. FIG. 2 is a longitudinal sectional view of the magnetic trip display device of the first embodiment. FIG. 3 is a longitudinal cross-sectional view showing the magnetic trip display device according to the first embodiment during a trip. FIG. 4 is a longitudinal sectional view showing the after-trip of the magnetic trip display device of the first embodiment. FIG. 5 is a top view showing a state in which the magnetic trip display device of Embodiment 1 is incorporated in a circuit breaker. FIG. 6 is a longitudinal sectional view of a circuit breaker incorporating the magnetic trip display device of the first embodiment. FIG. 7 is a longitudinal sectional view showing a state in which the circuit breaker and the magnetic trip display device have tripped. FIG. 8 is a longitudinal sectional view showing a state where the electromagnet portion of the circuit breaker has returned to its original state and the magnetic trip display device has tripped. FIG. 9 is a longitudinal sectional view showing an operation of resetting the magnetic trip display device. FIG. 10 is a partial longitudinal sectional view of a circuit breaker incorporating a magnetic trip display device. FIG. 11 is a longitudinal sectional view of the magnetic trip display device of the second embodiment.

  Embodiments of a magnetic trip display device and a circuit breaker according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
1 is a perspective view showing a first embodiment of a magnetic trip display device according to the present invention, and FIG. 2 is a longitudinal sectional view of the magnetic trip display device of the first embodiment. As shown in FIGS. 1 and 2, the magnetic trip display device 10 according to the first embodiment includes an indicator 1, a case 2 that accommodates the indicator 1, a latch 3 that locks the indicator 1 in the case 2, and an indicator. And a coil spring 4 for displacing 1 in the case 2 in the lateral direction.

  The indicator 1 is supported by guides 21a and 21b provided in the case 2 so as to be displaceable in a lateral initial position and a lateral movement position in the lateral direction. The latch 3 is supported in the case 2 so as to be displaceable in the vertical direction between a vertical initial position and a vertical operation position. When the latch 3 is in the vertical initial position, the claw 31 of the latch 3 abuts on the locking portion 11 of the indicator 1 and locks the indicator 1 in the horizontal initial position.

  The coil spring 4 is disposed in the case 2 so as to be able to expand and contract in the lateral direction, and in a compressed state, the coil spring 4 is in contact with the indicator 1 at one end and the case 2 at the other end, and between the case 2 and the indicator 1. It is pinched. One end of the coil spring 4 is held by ribs 12 a and 12 b provided on the indicator 1, and the other end is held by ribs 22 a and 22 b provided on the case 2. The central portion of the coil spring 4 is in contact with the spring pressing portion 32 of the latch 3.

  An opening 23 is formed in the upper part of the case 2, and a lateral rail-shaped guide 24 rising from the side wall of the case 2 is provided in the back of the opening 23. The guide 24 prevents the inside of the case 2 from being seen through the opening 23 and prevents foreign matter from entering the inside. A horizontal groove (not shown) is formed in the display portion 13 provided in the upper portion of the indicator 1 and disposed in the opening 23, and the guide 24 of the case 2 is fitted into this groove. The display unit 13 can be viewed from the opening 23 at the top of the magnetic trip display device 10.

  Next, the operation of the magnetic trip display device 10 will be described. FIG. 3 is a longitudinal sectional view showing that the magnetic trip display device according to the first embodiment is being tripped, and FIG. 4 is a longitudinal sectional view showing a state after the trip of the magnetic trip display device according to the first embodiment.

  As shown in FIG. 2, the coil spring 4 is incorporated in a compressed state inside the magnetic trip display device 10, and a rightward (lateral) force is acting on the indicator 1, but the indicator 1 Is locked in the horizontal initial position by the claw 31 of the latch 3 in the vertical initial position and does not move to the right. Hereinafter, this state is referred to as an “initial state”.

  In the initial state of the magnetic trip display device 10, as shown in FIG. 3, when the latch 3 receives the force in the direction of arrow A (upward) and is displaced to the upper vertical operation position, The locking portion 11 is unlocked, and the indicator 1 moves in the arrow B direction (right direction) and is displaced to the lateral movement position. At this time, the coil spring 4 is bent upward by being pressed by the spring pressing portion 32 of the latch 3.

  After that, when the force applied to the latch 3 is lost, the latch 3 is moved vertically by the force of the coil spring 4 which is pressed by the spring pressing portion 32 of the latch 3 and bent upward as shown in FIG. Return to the initial position. Hereinafter, this state is referred to as an “operation state”. Since the magnetic trip display device 10 of the first embodiment can control the operation of the two members of the indicator 1 and the latch 3 with one coil spring 4, the number of parts of the magnetic trip display device 10 can be reduced and reduced in size. Is possible.

  In the circuit breaker 50 (see FIG. 5) described later, when the short-circuit current is interrupted, an arc is generated between the contacts, the temperature inside the breaker becomes high, the internal pressure increases, and the air inside the circuit breaker is exposed to the outside. Discharged. In the magnetic trip display device 10 in the operating state, the coil spring 4 is compressed more than the normal state even if a force in the direction of returning the indicator 1 to the horizontal initial position is exerted by the air flow at the time of discharge. Since the force is acting in the right direction, the indicator 1 does not return to the horizontal initial position.

  FIG. 5 is a top view showing a state in which the magnetic trip display device of Embodiment 1 is incorporated in a circuit breaker. As shown in FIG. 5, the casing 51 of the circuit breaker 50 is provided with an openable / closable side cover 52a adjacent to the handle 65, and accommodates the magnetic trip display device 10 when the side cover 52a is opened. A magnetic trip display device accommodating portion 52b, which is a space, appears.

  The magnetic trip display device 10 is inserted into the magnetic trip display device accommodating portion 52b, the claws 25 of the case 2 of the magnetic trip display device 10 are engaged with the casing 51 of the circuit breaker 50, and the magnetic trip display device 10 is connected to the circuit. Do not fall off the breaker 50. The side cover 52a can be closed in a state where the magnetic trip display device 10 is accommodated in the magnetic trip display device accommodating portion 52b. A display window 53 is provided at a position where the guide 24 of the case 2 can be seen when the magnetic trip display device 10 is in the initial state, and when the display portion 13 of the indicator 1 displaced to the lateral movement position can be seen when in the operational state. ing.

  In addition, if the color difference between the color of the indicator 1 and the color of the case 2 is increased, it becomes easy to identify whether or not the magnetic trip display device 10 is in an operating state. The magnetic trip display device 10 is an internal accessory of the circuit breaker 50, and can be easily detached from the circuit breaker 50 when the magnetic trip display function is unnecessary. Further, since the magnetic trip display device 10 is accommodated in the magnetic trip display device accommodating portion 52b, a magnetic trip display function can be added without changing the width dimension of the circuit breaker 50.

  FIG. 6 is a longitudinal sectional view of a circuit breaker incorporating the magnetic trip display device of Embodiment 1, and FIG. 7 is a longitudinal sectional view showing a state in which the circuit breaker and the magnetic trip display device have tripped. 8 is a longitudinal sectional view showing a state in which the electromagnet portion of the circuit breaker has returned to its original state and the magnetic trip display device has tripped. FIG. 9 is a longitudinal sectional view showing an operation of resetting the magnetic trip display device. is there. 6 to 9, only members related to the magnetic trip display operation are shown in order to facilitate understanding of the operation.

  A reset pin 66 provided in the circuit breaker 50 protrudes from the magnetic trip display device accommodating portion 52 b, and the reset pin 66 is in contact with the locking portion 11 of the indicator 1. The reset pin 66 has a structure that moves along the long hole 67 when the circuit breaker 50 trips regardless of the cause of an overload current, a short-circuit current, or the like.

  When the short circuit current flows through the electric circuit with the circuit breaker 50 shown in FIG. 6 in the ON state, as shown in FIG. 7, the plunger 62 of the electromagnet portion 61 is attracted in the direction of arrow C by the electromagnetic force, and the lever 63 is moved to the arrow D. , E to rotate the mug bar 64 in the direction of arrow F. As a result, the circuit breaker 50 is magnetically tripped, and the handle of the handle 65 rotates in the direction of the arrow G to reach the ON / OFF central position. From the position of the handle 65, it can be confirmed from the outside that the circuit breaker 50 is tripping. The lever 63 and the mug bar 64 constitute a mechanism part.

  When the circuit breaker 50 trips, the mug bar 64 rotates in the direction of arrow F, the latch 3 of the magnetic trip display device 10 is pushed up and displaced from the initial vertical position to the vertical operation position, and the pawl 31 of the latch 3 is moved to the indicator 1. Is released from the locking portion 11 and the locking is released. Further, since the reset pin 66 that is in contact with the locking portion 11 of the indicator 1 moves in the direction of arrow H, the indicator 1 moves in the direction of arrow B by the extension force of the coil spring 4, and the magnetic trip display device 10 It becomes an operation state.

  When the circuit breaker 50 is tripped, the current is interrupted, so that the current does not flow to the electromagnet portion 61 and the electromagnetic force is lost, and the plunger 62 and the lever 63 are initialized by a spring (not shown) engaged with the lever 63. Return to the position (position shown in FIG. 6). Further, a spring (not shown) is also engaged with the mag bar 64, and when the lever 63 returns to the initial position, the mag bar 64 also returns to the initial position, and the coil spring 4 bent upward is caused by the force to return linearly, The spring pressing portion 32 is pressed downward, and the latch 3 also returns to the vertical initial position.

  When the short circuit is interrupted, the mug bar 64 does not press the indicator 1 directly, but operates the indicator 1 via the latch 3. Therefore, even if the movement of the mug bar 64 becomes faster as in the case of the high current interrupt, There is no pinching with the reset pin 66. Therefore, the magnetic trip display device 10 can be put into an operating state without damaging the mug bar 64 and the indicator 1.

  When the circuit breaker 50 is in a magnetic trip state, as shown in FIG. 9, when the handle 65 is rotated in the direction of arrow I, the reset pin 66 is rotated in the direction of arrow J along the long hole 67. Push the indicator 1 of the magnetic trip display device 10 leftward. When the indicator 1 is pushed, the reset pin 66 comes into contact with the latch 3. However, since the contact surface 33 (see FIG. 2) of the latch 3 is inclined, the latch 3 is pushed up, as shown in FIG. In addition, the reset pin 66 returns the indicator 1 to the horizontal initial position.

  Further, when an overload current flows and a thermal trip occurs when the circuit breaker 50 is ON, the reset pin 66 that has been in contact with the indicator 1 moves in the direction of arrow H shown in FIG. At this time, the mug bar 64 does not rotate or rotates only to the extent that the claw 31 of the latch 3 and the engaging portion 11 of the indicator 1 are not disengaged. Therefore, the magnetic trip display device 10 remains in the initial state, and it is possible to determine whether the circuit breaker 50 has tripped due to overload current or short circuit current.

  FIG. 10 is a partial longitudinal sectional view of a circuit breaker incorporating a magnetic trip display device. A convex portion 54 having an inclined surface 54a is formed in the magnetic trip display device accommodating portion 52b. When the magnetic trip display device 10 is in the operating state and the indicator 1 is in the lateral operation position, the inclined surface 54a of the convex portion 54 is formed on the inclined surface 14 below the indicator 1 when inserted into the magnetic trip display device accommodating portion 52b. The indicator 1 is abutted and presses the indicator 1 in the lateral direction, and the indicator 1 moves in the initial state (the direction of the arrow K shown in FIG. 10). Further, when the magnetic trip display device 10 is inserted in the back, the reset pin 66 comes into contact with the inclined surface 14 at the lower end of the indicator 1 and further presses in the direction of the arrow K, and the indicator 1 is set at the horizontal initial position.

  It is desirable that the magnetic trip display device 10 is accommodated in the circuit breaker 50 in the initial state. However, according to the circuit breaker 50 of the first embodiment, the magnetic trip display device 10 is erroneously operated (indicator 1). Even if it is going to be accommodated in the circuit breaker 50 in a state in which it is in the lateral movement position), it is forcibly set to the initial state (state in which the indicator 1 is in the lateral initial position) and accommodated in the circuit breaker 50. Therefore, it is possible to prevent the Mag Trip display device 10 from being in an operating state even though no Mag Trip operation has occurred.

  Since the magnetic trip display device 10 of the first embodiment is composed of four main parts, the case 2, the indicator 1, the latch 3, and the coil spring 4, the structure is simple. Moreover, since it accommodates in the magnetic trip display apparatus accommodating part 52b inside the circuit breaker 50, the external shape of the circuit breaker 50 is not enlarged. Further, when the magnetic trip display function is unnecessary, the magnetic trip display device 10 can be removed from the circuit breaker 50.

Embodiment 2. FIG.
FIG. 11 is a longitudinal sectional view of the magnetic trip display device of the second embodiment. As shown in FIG. 11, in the magnetic trip display device 210 of the second embodiment, the coil spring 4 includes the spring pressing portion 32 of the latch 3 that presses the central portion of the coil spring 4 from the lower side, and one end of the coil spring 4 on the upper side. The rib 12a of the indicator 1 to be restrained and the rib 22a of the case 2 to restrain the other end of the coil spring 4 on the upper side are restrained only by three points. Therefore, when the latch 3 is pushed up, both end portions of the coil spring 4 are displaced downward, and the coil spring 4 is curved as a whole. Therefore, like the magnetic trip display device 10 of the first embodiment, the indicator 1 Both ends of the coil spring 4 are constrained by the ribs 12a and 12b and the ribs 22a and 22b of the case 2, and the force to return the latch 3 to the original position becomes weaker than that in which the bending range of the coil spring 4 is narrow. Therefore, a force is not so much applied from the magnetic trip display device 210 to the mechanical part of the circuit breaker 50, and the influence on the breakage of the circuit breaker 50 is small.

  As described above, the magnetic trip display device and the circuit breaker according to the present invention have a simple structure, do not increase the installation space of the circuit breaker, and change in internal pressure or high current at the time of breaking. This is useful in that it can be provided with a magnetic trip display function with high display reliability even when shut off.

  DESCRIPTION OF SYMBOLS 1 Indicator, 11 Locking part, 12a, 12b Rib, 13 Display part, 14 Inclined surface, 2 Case, 21a, 21b Guide, 22a, 22b Rib, 23 Opening, 24 Guide, 25 Claw, 3 Latch, 31 Claw, 32 Spring pressing portion, 33 contact surface, 4 coil spring, 10,210 Mag trip display device, 50 circuit breaker, 51 housing, 52a side cover, 52b magnetic trip display device receiving portion, 53 display window, 54 convex portion, 54a Inclined surface, 61 electromagnet, 62 plunger, 63 lever, 64 mug bar, 65 handle, 66 reset pin, 67 oblong hole.

Claims (5)

It is housed in a circuit breaker that performs a trip operation by an electromagnet portion when a short-circuit current flows, and is a magnetic trip display device that displays that the trip operation by the electromagnet portion has been performed,
A case with an opening at the top;
An indicator provided in the opening at the top is provided, and an indicator supported in the case so as to be displaceable in a lateral initial position and a lateral movement position in the lateral direction;
A coil spring that is sandwiched between the case and the indicator in a compressed state and presses the indicator and the display unit so as to be displaced from the lateral initial position to a lateral movement position;
The case is supported so as to be displaceable in a vertical initial position and a vertical operation position in the vertical direction, and when in the vertical initial position, the indicator is locked at the horizontal initial position, and when the indicator is displaced to the vertical operation position, the A latch for unlocking and displacing the indicator and the display unit to the lateral movement position and bending the coil spring upward;
A magnetic trip display device comprising:   The coil spring includes a spring pressing portion of the latch that presses the central portion of the coil spring from below, a rib that constrains one end of the coil spring that contacts the case on the upper side, and the other end of the coil spring that contacts the indicator. 2. The magnetic trip display device according to claim 1, wherein the magnetic trip display device is restrained only at three points, that is, a rib that restrains the upper portion of the rib on the upper side.   The mug according to claim 1, wherein a lateral rail-shaped guide rising from a side wall of the case is provided at the opening of the case, and the guide prevents the inside of the case from being seen. Trip display device. A housing having a magnetic trip display device accommodating portion for accommodating the magnetic trip display device according to claim 1;
The magnetic trip display device according to claim 1 housed in the magnetic trip display device housing portion,
A side cover that covers the magnetic trip display device housing;
A display window provided on the side cover, wherein the display unit is visible when the display unit is displaced to a lateral movement position;
An electromagnet part and a mechanism part for displacing the latch of the magnetic trip display device housed in the magnetic trip display device housing part from the longitudinal initial position to a longitudinal operation position;
A circuit breaker comprising:   A convex portion having an inclined surface is formed in the magnetic trip display device accommodating portion, and when the indicator of the magnetic trip display device is inserted into the magnetic trip display device accommodating portion in a lateral operation position, the convex portion is formed. 5. The circuit breaker according to claim 4, wherein the inclined surface of the portion abuts against the inclined surface of the lower portion of the indicator and is pressed in the lateral direction, and the indicator is set at a lateral initial position.

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