JP2016015289A - Electromagnetic tripping device of earth leakage breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic tripping device of an earth leakage breaker including a leakage display button with a small number of components.SOLUTION: The electromagnetic tripping device of an earth leakage breaker includes: a trip lever 6 that transmits an action of a plunger 5 to an interruption mechanism; a magnet case 4 that houses an electromagnet device 3; a coil spring 2 that activates a display action of a leakage display button 1a; a coil spring 7 for returning to the original position the trip lever 6 moved in conjunction with restoring the plunger 5 that performed a pull-in operation; and a reset arm 8 for resetting a display action of the leakage display button 1a in conjunction with an off operation of an operation handle 21 for switching a cable way. The leakage display button 1a is formed at an apex of an advancing/retreating component 1 that advances and retreats from an inside of the magnet case 4 and performs display/non-display of a leakage occurrence by an advancing/retreating action of the advancing/retreating component 1. The advancing/retreating component 1 is engaged with the trip lever 6 in both states of being advanced and retreated and mutual positions are regulated.

Description

  The present invention relates to an electromagnetic trip device for an earth leakage breaker, and more particularly to an electromagnetic trip device having an earth leakage display button for displaying the occurrence of an earth leakage.

The earth leakage breaker has an earth leakage display button for displaying the occurrence of earth leakage, and is configured to be able to determine whether the cause of the breaking operation is earth leakage. This earth leakage display button is normally configured integrally with the electromagnetic trip device and operates in conjunction with the trip operation. And the thing of the structure which can recognize that an electric leakage generate | occur | produced is prevailing by making a display member (display button) protrude from the window of a circuit breaker housing.
For example, in the earth leakage circuit breaker disclosed in Patent Document 1, when the electromagnetic device performs an earth leakage detection operation in response to the occurrence of earth leakage, the second transmission lever is operated to cause the earth leakage display button to project and perform the display operation. The first transmission lever was operated via the transmission lever to perform the blocking operation of the blocking mechanism.

Japanese Patent No. 2953870

  The conventional electromagnetic tripping device for the earth leakage circuit breaker is configured to detect the earth leakage of the electromagnet device in addition to the transmission member (second transmission lever) for displaying the earth leakage display button as disclosed in Patent Document 1 above. Is provided with a transmission member (first transmission lever) for interrupting the electric path, and the second transmission lever is also provided with a coil spring for returning to the original position after rotation, and an electromagnetic trip device There were many constituent members, and the assembly was complicated.

  Then, in view of such a problem, the present invention aims to provide an electromagnetic trip device for an earth leakage breaker having an earth leakage display button with a small number of members.

In order to solve the above-mentioned problem, the invention of claim 1 comprises an electromagnet device that pulls in the plunger to cut off the shut-off mechanism when a leak occurs, and a leak-indicating display button that performs a leak-indicating operation in response to the pull-in operation of the plunger. An electromagnetic trip device for an earth leakage breaker, which is engaged with the plunger and retracts integrally, and a trip lever that transmits the plunger retracting operation to the breaking mechanism, a magnet case that houses the electromagnet device, and an earth leakage display A first urging means for displaying the button, and a second urging means for returning the retracted plunger and returning the trip lever moved together to the original position. It is formed on the top of the retractable member that moves in and out of the magnet case, and the leakage operation is displayed / hidden by the retracted operation of the retractable member. Retractable member, characterized in that the mutual position is restricted engaged with the trip lever in a state of both were infested.
According to this configuration, since the earth leakage display operation of the earth leakage display button is performed by the retracting member engaged with the trip lever and the first biasing means, the earth leakage display operation can be realized with a small number of members. Further, since the second biasing means for returning the trip lever to the original position is also a biasing means for resetting the position of the plunger, there is no dedicated biasing means for returning the substantial trip lever to the original position. , Members can be reduced.
In addition, since the projecting member engages with the trip lever both in the exposed state and in the depressed state to regulate the position of the trip lever, the trip lever can be prevented from falling off in both states. Easy to handle removal device.

According to a second aspect of the present invention, in the configuration according to the first aspect, the reset arm which resets the display state of the leakage display button to be in a non-display state in conjunction with the turning-off operation of the operation handle for opening and closing the electric circuit. The reset arm is disposed adjacent to the magnet case and pivotally supported by the magnet case, and engages with the operation handle, and the retracting member engaging portion that holds the engaging piece formed on the retracting member. When the operation handle is turned off, the reset arm rotates and moves the in / out member via the in / out member engaging portion. It is characterized by shifting to the display state.
According to this configuration, since the leakage display button in the display state is reset when the operation handle is turned off, forgetting to reset the leakage display button can be prevented. Since the reset arm is engaged with the retractable member, it can always be connected, and it is necessary to provide a biasing means for resetting the reset arm by resetting the reset arm to the original position in accordance with the reset of the leakage indication button. There is no.

According to a third aspect of the present invention, in the configuration of the second aspect, the magnet case has an angle restricting protrusion that engages and stops the rotation of the reset arm at a certain angle at which the leakage indicator button is in the reset state. It is characterized by that.
According to this configuration, since the rotation of the reset arm stops at the stage where the leakage indicator button is reset, the reset arm does not rotate more than a certain angle, and the engagement member and the trip lever are disengaged. The trip lever can be prevented from falling off. Therefore, the electromagnetic tripping device is easy to handle, and the assembly workability can be improved.

According to the present invention, since the earth leakage display operation of the earth leakage display button is performed by the retracting member engaged with the trip lever and the first biasing means, the earth leakage display operation can be realized with a small number of members. Further, since the second biasing means for returning the trip lever to the original position is also a biasing means for resetting the position of the plunger, there is no dedicated biasing means for returning the substantial trip lever to the original position. , Members can be reduced.
In addition, since the projecting member engages with the trip lever both in the exposed state and in the depressed state to regulate the position of the trip lever, the trip lever can be prevented from falling off in both states. Easy to handle removal device.

It is a perspective view which shows an example of the electromagnetic trip apparatus of the earth-leakage circuit breaker which concerns on this invention. FIG. 2 is an exploded view of the electromagnetic tripping device of FIG. (A) is a top view of an electromagnetic trip device, (b) is an AA line sectional view. It is a side view of an electromagnetic trip device, (a) shows a steady state after reset, and (b) shows a detection operation state in which leakage is detected. FIG. 6 is a diagram for explaining the operation of the electric leakage display button, in which (a) shows a steady state not in an electric leakage state, and (b) shows a display state for notifying the occurrence of electric leakage. It is side surface explanatory drawing of an earth-leakage circuit breaker main body, and is a figure which shows engagement with an operation handle and an electromagnetic trip apparatus.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. 1 to 3 show an example of an electromagnetic trip device for an earth leakage circuit breaker according to the present invention. FIG. 1 is a perspective view, FIG. 2 is an exploded view, FIG. 3 (a) is a plan view, and FIG. It is AA sectional view. Reference numeral 1 denotes a projecting / retracting member provided with an earth leakage display button 1a which performs an earth leakage display operation in response to the occurrence of earth leakage. 4 is a magnet case that houses the electromagnet device 3, 5 is a plunger that is incorporated in the electromagnetic coil 3a and forms a part of the electromagnet device, and 6 is engaged with the tip of the plunger 5 to shut off a shut-off mechanism (not shown). A trip lever, 7 is a coil spring as a second urging means for projecting the trip lever 6 forward, 8 is a reset arm for resetting the retracting member 1 that has been operated for leakage indication, and 9 is for testing the operation of the electromagnet device 3. This is a test terminal.
In the following description, the direction in which the leakage indicator button 1a protrudes is referred to as upward, and the tip end direction of the trip lever 6 is referred to as forward.

The in / out member 1 has a main body 1b formed in a frame shape, and the electric leakage display button 1a is formed at the upper end of the main body 1b. The main body 1b has an opening 11 through which the plunger 5 and the trip lever 6 are inserted in the center, and a hooking piece 12 that hooks on the reset arm 8 is projected from one side. On the other hand, the earth leakage display button 1a is formed so as to protrude to the side of the main body 1b, and has a lower surface against which one end of the coil spring 2 disposed in the magnet case 4 abuts.
Thus, the protruding and retracting member 1 is housed in the magnet case 4 in a state of being constantly biased upward by the elasticity of the coil spring 2.
Then, the lower side 13 of the opening 11 abuts the lower end of the trip lever 6 to regulate the amount of upward projection of the leakage indicator button 1a, and the front and rear end portions of the lower side 13 are engaged with the trip lever 6 and moved forward. A first upright piece 14a and a second upright piece 14b are formed to prevent the removal.

The magnet case 4 has a housing portion for the electromagnet 3 at the rear part, and an earth leakage display button 1a is arranged at the center upper part, and the projecting member 1 is held on the inner surface of the magnet case 4 which is the lower part of the magnet case 4. Guide grooves 4a for guiding the operation are formed on the left and right sides, enabling the sliding member 1 to slide smoothly. And the accommodating part of the trip arm 6 is formed in the front side.
Further, a shaft hole 4b that supports the rotation of the reset arm 8 and a regulation step 4c that regulates the rotation angle of the reset arm 8 are provided on one side surface.

  The plunger 5 is provided with a locking groove 5 a that is locked to the trip lever 6 at the tip, and about half of the rear is accommodated in a through hole 3 b provided in the center of the electromagnet device 3, and the penetrating hole serving as the back portion of the plunger 5. A space E for enabling the pull-in operation of the plunger 5 is provided at the back of the hole 3b.

  The trip lever 6 has a locking portion 6a for locking the tip of the plunger 5, moves in conjunction with the pulling operation of the plunger 5 into the electromagnet device 3, and an operation portion 6b formed at the tip by the moving operation. A blocking mechanism (not shown) is operated to perform a blocking operation.

  The reset arm 8 has a rotating shaft 8a inserted into a shaft hole 4b provided in the magnet case 4 at the base, and an oval holding hole 8b for holding the engaging piece 12 of the retractable member 1 at the tip. A handle engaging portion 8c that engages with a handle frame 22 that supports an operation handle 21, which will be described later, is provided in the vicinity of the holding hole 8b. A hooking piece 12 is inserted into the holding hole 8b and hooked, and is always held.

  The operation of the electromagnetic tripping device configured as described above is as follows. This will be described with reference to FIGS. 4A and 4B are side views of the electromagnetic trip device, where FIG. 4A shows a steady state after resetting, and FIG. 4B shows a leakage display state in which leakage is detected. FIGS. 5A and 5B are diagrams for explaining the operation of the earth leakage display button. FIG. 5A shows a steady state in which no earth leakage occurs, and FIG. 5B shows a display state for notifying the occurrence of earth leakage. 4 and 5 are shown with the left and right reversed. In FIG. 5, H indicates the top surface of the earth leakage breaker housing, and 20a indicates an opening window for displaying an earth leakage.

  In a steady state where no leakage occurs as shown in FIG. 5A, the plunger 5 is not drawn into the electromagnet device 3, so that the plunger 5 is drawn into the back of the plunger 5 as shown in FIG. 3B. A space E is formed. In this state, the earth leakage display button 1a is accommodated in the housing of the earth leakage breaker and does not protrude from the upper surface H.

Here, the engagement between the retracting member 1 and the trip lever 6 will be specifically described. As shown in FIG. 5, the trip lever 6 has a lower portion of a first engagement portion 6c and a second engagement portion 6d that is disposed in front of the first engagement portion 6c and is formed one step higher. A formed engaging portion is provided. A step formed between the first engaging portion 6 c and the second engaging portion 6 d is a restriction wall 6 e that restricts the protrusion of the trip lever 6 to the front.
In the steady state, the lower side 13 of the retracting member 1 is in contact with the first engaging portion 6c formed in this way, and the protrusion of the electric leakage display button 1a is restricted. On the other hand, the trip lever 6 is in contact with the second upright piece 14b and its protrusion is restricted.

  When electric leakage occurs, the plunger 5 is instantaneously drawn into the electromagnet device 3 by the electromagnetic force generated in the electromagnet device 3. That is, it moves in the direction of arrow P in FIG. As a result, the engagement between the lower side 13 of the opening 11 and the first engaging portion 6c is released, and the retracting member 1 moves upward by the biasing force of the coil spring 2 as shown in FIG. As a result, the leakage display button 1a protrudes from the upper surface H of the housing, and the occurrence of leakage is displayed. Further, as shown in FIG. 5 (b), the engaging portion of the retracting member 1 with the plunger 5 moves to the second engaging portion 6 d, and the trip lever 6 is moved to the first standing piece 14 a of the retracting member 1. It stops at the position where it comes into contact and is pulled out, and is prevented from falling off.

  When the earth leakage display button 1a is pressed in the state of the earth leakage display that has tripped, the engagement between the retracting member 1 and the trip lever 6 is released, and the trip lever 6 and the plunger 5 move forward by the bias of the coil spring 7. To return. In this way, the engagement target of the retractable member 1 is shifted to the first engagement portion 6c, the leakage display button 1a is kept pressed, and returns to the steady state shown in FIG.

  Next, a case where the operation handle of the earth leakage breaker is operated will be described with reference to FIG. FIG. 6 is an explanatory side view of the earth leakage breaker main body, showing the relationship between the operation handle and the electromagnetic trip device, and showing a state in the middle of the off operation. 21 is an operation handle for opening and closing the electric circuit, 22 is a handle frame that supports the operation handle 21 and accommodates a link mechanism therein, and 23 is a housing body of an earth leakage breaker.

  The handle frame 22 rotates around a support shaft 21a provided at the lower end, and is turned off by rotating in the direction indicated by the arrow Q, thereby interrupting the electric circuit. The handle frame 22 has an abutting portion 22a that abuts on the handle engaging portion 8c of the reset arm 8 during the OFF operation when the leakage indication button 1a is in the leakage indication state. On the way, the handle frame 22 abuts on the handle engaging portion 8c and rotates in conjunction with it, and the leakage indication button 1a is shifted to the reset state when the off operation is completed.

Thus, since the leakage display operation of the leakage display button 1a is performed by the retracting member 1 engaged with the trip lever 6 and the coil spring 2 as the first biasing means, the leakage display operation can be realized with a small number of members. . Further, the coil spring 7 as the second urging means for returning the trip lever 6 to the original position is also an urging means for resetting the position of the plunger 5, so that the substantial trip lever 6 is returned to the original position. There is no dedicated biasing means, and the number of members can be reduced.
Further, since the retracting member 1 engages with the trip lever 6 in both the exposed state and the retracted state of the magnet case 4 to regulate the position of the trip lever 6, the trip lever 6 is prevented from falling off in both states. It is easy to handle the tripping device.

Furthermore, since the leakage display button 1a in the display state is reset by turning off the operation handle 21, it is possible to prevent forgetting to reset the leakage display button 1a. Since the reset arm 8 is engaged with the retractable member 1, it can always be connected, and the reset arm 8 returns to the original position in accordance with the reset of the electric leakage display button 1 a and urges the reset arm 8 to be reset. There is no need to provide a separate means.
In addition, when the earth leakage display button 1a is reset, the reset arm 8 stops rotating by contacting the regulating step 4c as shown in FIG. 4A, so that the reset arm 8 rotates more than a certain angle. The engagement of the projecting member 1 and the trip lever 6 is released, and the trip lever 6 can be prevented from falling off. Therefore, the electromagnetic tripping device is easy to handle, and the assembly workability can be improved.

  1 .. Extruding member, 1 a .. Earth leakage display button, 2 .. Coil spring (first urging means) 3 .. Electromagnet device, 4 .. Magnet case, 4 c .. Restriction step (angle regulation protrusion), 5 .. Plunger, 6 ... Trip lever, 7 ... Coil spring (second urging means), 8 ... Reset arm, 8a ... Rotary shaft, 8b ... Holding hole (protruding member engaging part), 8c・ Handle engaging part, 12 ・ ・ Hanging piece, 21 ・ ・ Operating handle, 22 ・ ・ Handle frame, H ・ ・ Upper surface of housing.

Claims (3)

An electromagnetic trip device for an earth leakage circuit breaker comprising an electromagnet device that draws a plunger to shut off a shut-off mechanism when an electric leakage occurs, and an earth leakage display button that performs an earth leakage display operation in response to the pulling operation of the plunger,
A trip lever that engages with the plunger and pulls in integrally, and transmits the pull-in operation of the plunger to the blocking mechanism;
A magnet case that houses the electromagnet device;
First urging means for displaying and operating the leakage indicator button;
A second urging means for returning the plunger that has been retracted and returning the trip lever that has moved together to the original position;
The earth leakage display button is formed on the top of an in / out member that moves in and out from within the magnet case, and displays / hides the occurrence of electric leakage by the in / out operation of the in / out member,
An electromagnetic trip device for an earth leakage circuit breaker characterized in that the projecting member engages with the trip lever in both the projecting and projecting states and the mutual position is regulated. In conjunction with the off operation of the operation handle that opens and closes the electric circuit, the reset arm that resets the display state of the electric leakage display button to the non-display state,
The reset arm is disposed adjacent to the magnet case, is pivotally supported by the magnet case, and engages with the operation handle, and a retracting member that holds an engaging piece formed on the retracting member. Having a hooking portion,
When the operation handle is turned off, the reset arm is rotated with respect to the in / out member in which the electric leakage display button is in an electric leakage display state, and the in / out member is moved via the in / out member engaging portion, The electromagnetic trip device for an earth leakage circuit breaker according to claim 1, wherein the non-display state is shifted. The earth leakage circuit breaker according to claim 2, wherein the magnet case has an angle restricting protrusion that engages and stops the rotation of the reset arm at a certain angle at which the earth leakage display button is in a reset state. Electromagnetic tripping device.

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