JP6658360B2 - Earth leakage breaker - Google Patents

Description

  The present invention relates to an earth leakage circuit breaker provided with an earth leakage trip device for detecting a leakage current of a load circuit and interrupting the circuit, and more particularly to an earth leakage circuit breaker having an attraction type electromagnet device.

The attraction type electromagnet device of the earth leakage tripping device used for the conventional earth leakage circuit breaker has a solenoid type electromagnet having a movable iron core arranged in a coil, a hook attached to the tip of the movable iron core, and engaging with this hook. And a display button protruding from the housing of the earth leakage breaker when the earth leakage is detected.
Further, in the earth leakage trip device, usually, the movable direction of the movable core is provided in parallel with the trip direction of the trip bar, and when a leakage is detected, a predetermined current is applied to the coil to attract the movable core. The opening / closing mechanism is tripped by the hook pulling down the trip bar in conjunction with the suction, and the opening / closing contact is separated (for example, see Patent Documents 1 and 2).

Japanese Patent Application Laid-Open No. Hei 7-161280 (FIG. 9) JP 2011-124217 A (FIG. 2)

In the conventional earth leakage breaker, since the suction direction of the movable core is parallel to the trip direction of the trip bar, the earth leakage trip device is provided in the side space of the opening / closing mechanism, and the power supply-load direction is set to the direction of the movable core. It is common to arrange as a movable direction. However, in recent years, the external shape of the earth leakage breaker, particularly the width direction, has been reduced in size, and the side space of the opening / closing mechanism for installing the earth leakage trip device has been reduced.
As a countermeasure, it is conceivable to reduce the outer diameter of the attraction type electromagnet device.However, if the outer diameter of the attraction type electromagnet device is reduced, the attraction force of the attraction type electromagnet device is reduced. There is a problem that it is difficult to secure a trip load.

  The present invention has been made in order to solve the above-described problem, and it is an object of the present invention to obtain a downsized earth leakage circuit breaker while securing a suction force of an earth leakage trip device for tripping a trip bar. .

An earth leakage breaker according to the present invention comprises a base, at least two terminals arranged on the base at intervals and connected to an electric circuit, an open / close contact connected to the terminal and opening / closing the electric circuit, An opening / closing mechanism for opening / closing the contacts, a handle for opening / closing the opening / closing mechanism, a trip bar for tripping the opening / closing mechanism, and an overcurrent trip device for driving the trip bar based on a current flowing through an electric circuit; A leakage current detector is provided between the steering wheel and the overcurrent tripping device for detecting a leakage current of the electric circuit, and a tripping device for driving a trip bar based on a detection signal of the leakage current detector is provided . The device has a movable core provided movably in the arrangement direction of the terminals, and the movable core is disposed inside, and is energized based on a detection signal of a leakage current detector to attract the movable core. And yl are those with a.

  According to the earth leakage breaker of the present invention, since the earth leakage trip device is provided between the handle and the overcurrent trip device, the earth leakage circuit breaker can be downsized.

FIG. 2 is a perspective view of a part of the earth leakage breaker according to Embodiment 1 of the present invention as seen through. FIG. 2 is a side sectional view showing the ground fault interrupter in an ON state according to Embodiment 1 of the present invention. FIG. 2 is a side cross-sectional view illustrating the off-state earth leakage circuit breaker according to Embodiment 1 of the present invention. It is a perspective view which shows the earth leakage trip device in the earth leakage breaker of FIG. FIG. 5 is an exploded perspective view of the earth leakage trip device shown in FIG. 4. FIG. 3 is an explanatory diagram for explaining a reset operation with a side cross-sectional view illustrating an earth leakage trip device and a handle in the earth leakage breaker of FIG. FIG. 5 is a side view of the earth leakage trip device shown in FIG. 4 in a state where a movable iron core is sucked. FIG. 5 is a side view of the earth leakage trip device shown in FIG. 4 in a state where the movable iron core is not sucked. FIG. 3 is an explanatory diagram for explaining a suction direction and a trip bar trip direction in a top view showing the earth leakage trip device and the trip bar in the earth leakage breaker of FIG. 2. FIG. 2 is a side sectional view showing the earth leakage breaker in a trip state according to Embodiment 1 of the present invention.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a part of an earth leakage breaker according to Embodiment 1 of the present invention, FIG. 2 is a side sectional view showing an earth leakage breaker in an on state, and FIG. 3 is a side showing an earth leakage breaker in an off state. FIG. 4 is a perspective view showing an earth leakage trip device in the earth leakage breaker of FIG. 2, FIG. 5 is an exploded perspective view of the earth leakage trip device shown in FIG. 4, and FIG. 6 is an earth leakage trip in the earth leakage breaker of FIG. FIG. 7 is an explanatory view for explaining the reset operation with a side sectional view showing the detaching device and the handle, FIG. 7 is a side view of the earth leakage trip device shown in FIG. 4 in a state where the movable iron core is attracted, and FIG. 8 is shown in FIG. FIG. 9 is a side view of the earth leakage trip device in a state in which the movable iron core is not attracted. FIG. 9 is a top view showing the earth leakage trip device and the trip bar in the earth leakage circuit breaker of FIG. 2, and illustrates a suction direction and a trip bar trip direction. FIG. 10 is a diagram for explaining how to perform the operation. It is a side sectional view showing a circuit breaker.

  In FIG. 1, an earth leakage breaker 100 is configured using a housing 10 including a base 11 and a cover 12 formed of an insulating material. On the base 11, at least two circuit interruption units (for example, two in the case of two poles) connected to the electric circuit are arranged at intervals from each other at each pole. An opening / closing mechanism unit 30 (shown in FIG. 2) having a slow entry mechanism is arranged.

The cover 12 covers the circuit breaker unit of each phase and the opening / closing mechanism 30 on the base 11, and the handle 31 of the opening / closing mechanism 30 protrudes from the window hole 12 a of the cover 12.
Further, the circuit interruption units of each phase are configured to be the same as each other, and the push plate 13 is arranged on the base 11 in common with the circuit interruption units of each phase so as to be orthogonal to the circuit interruption units of each phase. You.

  As shown in FIG. 2, the circuit interruption unit of each phase includes a power supply terminal 20 connected to an electric circuit, a fixed contact 21 extending from the power supply terminal 20 and having a fixed contact 22, and a fixed contact 22. A movable contact 23 that contacts and separates, a movable contact 24 that has a movable contact 23 at one end, and that is held up and down freely by a push plate 13, and a flexible copper stranded wire 25 And an overcurrent trip device 40 that trips the switching mechanism 30 when an overcurrent flows, and a load-side terminal 27 that is connected to the overcurrent trip device 40 and that corresponds to the power-supply-side terminal 20.

  In addition, the earth leakage breaker 100 is driven by the overcurrent trip device 40 of each pole, and trips the tripping mechanism 30 and the flexible copper stranded wire 25 of all poles. Current detector 26, which detects a leakage current flowing through the power supply, and a handlebar 31 and an overcurrent trip device 40, which are provided between the handlebar 31 and the overcurrent trip device 40, and drive the trip bar 33 when the leakage is detected based on the output signal of the leakage current detector 26. And a detaching device 50.

In addition, as the leakage current detector 26, a zero-phase current transformer is used for an AC circuit, and a fluxgate sensor is used for a DC circuit in many cases.
The fixed contact 22 and the movable contact 23 constitute an open / close contact for opening and closing an electric circuit. When the movable contact 23 comes into contact with the fixed contact 22, an electric circuit between both terminals 20 and 27 is turned on, and FIG. When the movable contact 23 is separated from the fixed contact 22, the electric circuit between the terminals 20, 27 is turned off, as shown in FIG.

  The push plate 13 is moved up and down by the opening and closing mechanism 30, and when the push plate 13 moves up and down, each movable contact 24 of the circuit breaker unit of each pole moves up and down at the same time. Further, a separation spring 14 is provided between the movable contact 24 and the base 11, and urges the movable contact 24 in a direction in which the two contacts 22, 23 are separated. Due to the vertical movement of the movable contact 24, the movable contact 23 contacts and separates from the fixed contact 22.

  The overcurrent trip device 40 has one end connected to the movable contact 24 via the flexible copper stranded wire 25 and the other end connected to the load-side terminal 27, and is wound to convert an energized current into a magnetic flux. A coil 41, an L-shaped yoke 42 made of an electromagnetic plate, and through which the magnetic flux of the coil 41 passes, fixed to one leg of the yoke 42 and using the magnetic flux of the coil 41, the iron core is attracted to the pipe cover by the viscosity of oil. An oil dash pot 43 is provided for determining the time limit characteristic by controlling the period of time to be performed.

  As shown in FIGS. 4 and 5, the earth leakage trip device 50 has a coil 2 in which a predetermined number of enamel wires are wound around a resin bobbin 1 and is disposed so as to cover the coil 2 and has a role of increasing magnetic flux. A coil portion 51 composed of the yoke 3, a movable core 4 inserted through the inside of the coil 2, a movable core portion 52 composed of a stopper 5 fixed to the end of the movable core 4, and a stopper 5 engaged with the stopper 5 at reset, An actuator 6 released from the stopper 5 at the time of a trip, a display button 7 which moves up and down in accordance with the movement of the actuator 6, and a reset lever 8 for transmitting the rotational force of the handle 31 to the actuator 6 for resetting the actuator 6. Be composed.

  The actuator 6 has a through hole, and is rotatably disposed by inserting a pin 9 into the through hole. Further, a coil spring 53 for urging the projecting output to the movable iron core 52, a torsion spring 54 for urging the actuator 6 to rotate the trip bar 33 in a driving direction, and a torsion spring 54 projecting to the display button 7. A coil spring 55 is provided to bias the force.

  The movable core portion 52 is provided so as to be movable in the direction in which the terminals 20 and 27 are arranged. The coil 2 has the movable core portion 52 disposed therein, and is energized based on a detection signal of the leakage current detector 26. Then, the movable iron core 52 is sucked. That is, the moving direction of the movable core 52 is the same as the axial direction of the actuator 6, and the moving direction of the movable core 52 is orthogonal to the tripping direction of the trip bar 33. Although these components are actually housed and fixed in a resin case, they are not shown in the drawing.

The reset operation of the earth leakage trip device 50 will be described with reference to FIGS.
First, in FIG. 6, a solid line indicates a RESET position, and a two-dot chain line indicates a TRIP position. When the operator operates the handle 31 from the TRIP position to the RESET position, the handle arm 31a of the handle 31 pushes down the receiving portion 8a of the reset lever 8, so that the reset lever 8 is pushed down. Further, when the reset lever 8 is pushed down, the distal end 6a of the actuator 6 is pushed down via the pushing part 8b of the reset lever 8, and the actuator 6 is moved around the pin 9 as a shaft on the paper of FIG. Rotate clockwise against the urging force.

  When the tip 6a of the actuator 6 is pushed down to a certain position, the movable iron core 4 is not attracted to the coil 2, so that the stopper 5 moves over the arm 6b of the actuator 6 by the urging force of the coil spring 53 and moves to a predetermined position. To stop the rotation of the actuator 6 in the counterclockwise direction on the paper of FIG. That is, the state is changed from the trip state shown in FIG. 7 to the reset state shown in FIG. At this time, the urging force of the torsion spring 54 is accumulated in the actuator 6. Further, the locking portion 7a of the display button 7 is pushed by the tip 6a, and the display button 7 is pushed to the position before the projection. At this time, the urging force of the coil spring 55 is accumulated in the display button 7. Thereafter, when the handle 31 is rotated to the ON position, current starts to flow to the earth leakage breaker 100. At this time, the earth leakage trip device 50 remains in the reset state.

Next, the operation of the earth leakage breaker 100 at the time of earth leakage trip will be described with reference to FIG. 6, FIG. 9 and FIG.
When the leakage current detector 26 detects a leakage current of a predetermined value or more, the coil 2 is excited and the movable core 4 is attracted. As a result, as shown in FIGS. 6 and 9, the engagement with the stopper 5 that has locked the arm 6 b of the actuator 6 is released, and the actuator 6 is reset by the urging force accumulated in the torsion spring 54. To the TRIP position. By the rotation of the actuator 6, the trip portion 6c of the actuator 6 pulls down the trip bar 33.
Further, the arm 6b of the urged actuator 6 is locked by the movable core 52 composed of the movable core 4 and the stopper 5, as shown in FIG. The suction direction B of the iron core 4 is configured to be orthogonal.

When the actuator 6 rotates, the pressed display button 7 is also released, and the display button 7 jumps out to the projecting position by the restoring force of the coil spring 55 compressed at that time.
Further, as shown in FIG. 10, when the trip bar 33 is pulled down, the opening / closing mechanism 30 is removed, and the opening / closing mechanism 30 raises the push plate 13 so that the push plate 13 causes the movable contact 24 to move. Then, the movable contact 23 is separated from the fixed contact 22 and the breaking operation of the earth leakage breaker 100 is completed.

  According to the first embodiment, since the leakage trip device 50 that drives the trip bar 33 based on the detection signal of the leakage current detector 26 is provided between the handle 31 and the overcurrent trip device 40, It is possible to obtain a miniaturized earth leakage breaker while securing the suction force of the earth leakage trip device 50 for tripping the bar 33.

  In addition, since the leakage trip device 50 that drives the trip bar 33 based on the detection signal of the leakage current detector 26 is provided between the handle 31 and the overcurrent trip device 40, the left and right sides of the opening / closing mechanism unit 30 are provided. In this case, an empty space is provided, and the width of the circuit breaker can be reduced by that much, and the circuit breaker body can be downsized.

  In addition, since the leakage trip device 50 that drives the trip bar 33 based on the detection signal of the leakage current detector 26 is provided between the handle 31 and the overcurrent trip device 40, the left and right sides of the opening / closing mechanism unit 30 are provided. An empty space is formed in the space, and an electric leakage board, an auxiliary device, and the like can be arranged in the empty space.

  In addition, the earth leakage trip device 50 has a movable core 4 movably provided in the arrangement direction of the two terminals 20 and 27, and the movable iron core 4 is disposed therein, and is energized based on a detection signal of a leakage current detector. Since the coil 2 that attracts the movable iron core 4 is provided, when the leakage current occurs, the attraction force required for tripping only needs to be able to release the engagement between the actuator 6 and the stopper 5. The value obtained by adding the load of the coil spring 53 to the load received by the stopper 5 from the actuator 6 × the coefficient of friction (about 0.1 to 0.3 in the case of PBT) is sufficient. For this reason, it is not necessary to secure a suction force exceeding the trip load of the trip bar 33, and the current consumption of the earth leakage trip device 50 can be reduced.

  Further, in the conventional earth leakage trip device, it was necessary to increase the initial gap from the relation of the trip stroke. However, in the present embodiment, the moving distance of the movable iron core 4 may be a part of the movement with the actuator 6, and Since the initial gap can be reduced, the earth leakage trip device 50 can be made smaller, and the earth leakage breaker 100 can be made smaller.

  Further, since the trip direction of the trip bar 33 and the suction direction of the movable iron core 4 are orthogonal to each other, the earth leakage trip device 50 can be provided between the handle 31 and the overcurrent trip device 40, and the earth leakage breaker can be provided. 100 can be reduced in the width direction.

  In the present embodiment, the stopper 5 is fixed to the tip of the movable core 4 for locking the actuator 6, but the movable core is formed into a pressed part, and the tip of the movable core itself is formed in a stopper shape. Is also good.

  In the present embodiment, the reset lever 8 is provided for resetting the actuator 6. However, depending on the arrangement of the handle 31 and the actuator 6, the reset lever 8 may be omitted and the actuator 6 may be directly operated by the handle arm 31 a. May be pushed and rotated.

1 coil, 2 bobbins, 3 yokes, 4 movable cores, 5 stoppers,
6 Actuator, 6c tripping part, 7 display button,
8 reset lever, 8a receiving part, 9 pin, 26 leakage current detector,
30 opening and closing mechanism, 31 handle, 33 trip bar,
40 overcurrent trip device,
50 earth leakage trip device, 51 coil unit, 52 movable core unit,
53 coil spring, 54 torsion spring, 55 coil spring,
100 earth leakage breaker.

Claims (4)

A base, at least two terminals arranged on the base at an interval and connected to an electric circuit, an open / close contact connected to the terminal to open / close the electric circuit, and an open / close mechanism for opening / closing the open / close contact A handle for opening and closing the opening and closing mechanism, a trip bar for tripping the opening and closing mechanism, an overcurrent trip device for driving the trip bar based on a current flowing through the electric circuit, and a leakage current for the electric circuit. a leakage current detector for detecting a disposed between the handle and the overcurrent tripping device, and an earth leakage trip device for driving said trip bar based on a detection signal of the leakage current detector,
The earth leakage trip device is provided with a movable iron core movably provided in the arrangement direction of the terminals, and the movable iron core is disposed therein, and is energized based on a detection signal of the leakage current detector to attract the movable iron core. A ground fault circuit breaker, comprising: The earth leakage trip device includes an actuator that is provided with a biasing force in a direction of driving the trip bar, and is rotated against the biasing force by a reset operation of the handle, and the movable iron core includes a coil. when not sucked locking the rotation of said actuator by said biasing force, earth leakage breaker according to claim 1, characterized in that the locking of the actuator is released when it is attracted to the coil. 3. The electric leakage breaker according to claim 2 , wherein the electric leakage trip device includes a reset lever that is driven by the handle by a reset operation of the handle and rotates the actuator against the urging force. vessel. The earth leakage trip device includes a locking portion to be engaged by the actuator, according to claim 3, characterized in that it comprises a leakage display button which projects the locking of the locking portion by the actuator is disengaged 3. The earth leakage breaker according to 2.

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