JPH0227768B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an earth leakage indicator for use in an earth leakage breaker or earth leakage relay with a closing jacket;
In particular, the present invention relates to an earth leakage display device in which display information indicating an earth leakage state can be viewed through a display window of a closed jacket.

Description of the Prior Art Conventionally, there are two types of earth leakage display devices: electrical display type and mechanical display type. Electrical leakage indicators using lamps or light emitting diodes have the disadvantage that the operating indicator disappears when the power is turned off. In contrast, a mechanical display type earth leakage display device has the advantage that the operation display is maintained even if the power is turned off. However, in the case of a mechanical display type earth leakage indicator, a disadvantage is that the earth leakage indicator button is provided so as to protrude to the outside of the closure jacket in the event of an earth leakage. That is, the current leakage status is displayed by changing the position of the earth leakage display button, but when viewing this display button from a distance or from in front of the direction in which the earth leakage display button protrudes, A drawback was that it was difficult to discern the change in position.

Further, depending on the specifications, it is required to mount an accessory device such as an external operating handle or an electric operating device on the closure jacket and above the earth leakage indicator button. However, in the mechanical display type earth leakage display device, the earth leakage display button is structured so that it protrudes outside the closure envelope in the event of an earth leakage.
If the accessory device is installed as described above, the operation of the earth leakage indicator and the accessory device will be hindered. Therefore, the current drawback is that it is not possible to attach accessory devices.

Purpose of the Invention The present invention has been made to eliminate the above-mentioned drawbacks, and its main purpose is not to provide a structure in which a display button protrudes from a display window of a closure jacket, but to provide a structure in which a display button is not protruded from a display window of a closure jacket. It is an object of the present invention to provide a small-sized earth leakage display device that allows earth leakage display information to be clearly viewed from the outside.

Summary of the Invention The earth leakage display device according to the present invention includes an electromagnetic device that operates in response to an earth leakage signal, a displacement member that is displaced from a normal position to an abnormal position in accordance with the operation of the electromagnetic device, and a closure jacket that is provided with an external a display window provided so as to be visible; a mirror body fixedly provided within the closing envelope at a position facing the display window;
and display means disposed within the closure envelope and movable along a path connecting the displacement member and the mirror body. The mirror body has a mirror surface formed into a conical slope with the apex facing the display window. The display means can move between a first position close to the mirror body and a second position close to the displacement member side along a path connecting the displacement member and the mirror body. The electromagnetic device further includes a spring biasing the display means to the first position.

The display means includes a display member and a display rod.
The display member has an inner peripheral surface that surrounds the mirror surface when the display means is brought to the first position, and display information is formed on the inner peripheral surface. The indicator rod is fixed to the indicator member and retains the indicator means in the second position by engaging the displacement member when the displacement member is in the normal position.

When the electromagnet device operates in response to the leakage signal, the displacement member is displaced from the normal position to the abnormal position.
This displacement of the displacement member releases the engagement state between the displacement member and the display rod. The display means is brought to the first position by the biasing force of the spring. At that position, the inner circumferential surface of the display member is positioned so as to surround the mirror surface. Therefore, the display information formed on the inner circumferential surface of the display member is reflected through the mirror surface of the mirror body and viewed through the display window of the closure jacket.

The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view showing an earth leakage breaker having an embodiment of the present invention, partially cut away so that the inside thereof can be seen. FIG. 2 is a side sectional view taken along the line - in FIG.
The figure is a side cross-sectional view taken along the line - in FIG. 1.

The closing envelope 1 of the earth leakage circuit breaker includes a molded insulator container 1
a and a molded insulator container cover 1b. The input terminal portion 2 is led out from one end of the fixed terminal conductor 3, and a fixed contact 4 is provided at the bent tip of the fixed terminal conductor 3. This fixed contact 4
A movable contact 5 is provided at the tip of a movable contact rod 6 so as to correspond to the above. The movable contact rod 6 is connected to a contact holder 7 by a rotation shaft 8, and the contact holder 7 is connected to a contact holder rotation shaft 9.
It is attached to the shaft. An insulating arm 10 is connected to a contact holder 7 of each pole. By this rotation of the arm 10, the movable contact rod 6 connected to the contact holder 7 is operated to the open position or the closed position via the main opening/closing mechanism.

The main opening/closing mechanism of the movable contact rod 6 is composed of toggle links 11 and 13, an opening/closing lever 18, and an operating spring 19. One end of the toggle link 11 is connected to the contact holder 7 via a rotation shaft 8, and the other end is connected to one end of a toggle link 13 via a toggle link shaft 12. The other end of the toggle link 13 is connected to a tripping lever 14. The opening/closing lever 18 has its lower end connected to the fixed frame 1.
It is rotatably supported by a fixed shaft 16 provided on the handle 5, and its upper end is formed integrally with an operating handle 17. The operation spring 19 is connected to a spring hanging piece 18a at the upper end of the opening/closing lever 18 and a toggle link shaft 12.
It is built between. The tripping lever 14 constitutes a part of a tripping response device together with the main hook 20, and one end thereof is rotatably attached to a rotating shaft 21 on the fixed frame 15, and the other end is freely releasable to the main hook 20. It is locked to.

A contact spring 24 is disposed between the contact mounting pin 22 fixed to the movable contact rod 6 and the contact spring mounting piece 23 fixed to the contact holder.
is installed, and the spring force of this contact spring 24 causes the movable contact 5 to move against the fixed contact 4.
contact pressure is applied. Flexible conductor 25
electrically connects the movable contact rod 6 and the connecting piece 27 fixed to the intermediate connecting terminal 26.

A well-known unit device including a trip mechanism and an overcurrent trip element housed in a case, ie, a trip mechanism section 28, is provided in pairs to respond to each pole. The main hook 20, which engages the tripping lever 14, engages a secondary hook 29, which in turn engages with a recessed pawl 30' of the tripshaft 30. The main current conductor 31 has a heater bent portion, and both ends thereof are connected to intermediate connection terminals 26 and 32, respectively. As overcurrent tripping elements, an instantaneous tripping electromagnet 33, an instantaneous tripping rod 34, a trip adjustment screw 35, a trip piece 36,
Bimetal 3 that responds to heat generated at the bent part of the heater
7 is provided.

The opening/closing operation of the earth leakage breaker including the tripping mechanism and overcurrent tripping element configured as described above will be described. In order to normally open the circuit from the closed state shown in FIG.
Move it to the OFF side, that is, to the right in Fig. 2. Then, the pair of toggle links 11 and 13 are bent deeply, and the connecting shaft 8 connecting the contact holder 7 and the movable contact rod 6 is pulled up. Accordingly, the movable contact 5 separates from the fixed contact 4 using the rotation shaft 9 of the contact holder 7 as a fulcrum, and enters the normal OFF state.

To close the circuit, contrary to the above, by moving the operating handle 17 to the ON side, that is, to the left in the figure, the pair of toggle links 11 and 13 will extend, thereby rotating the contact holder 7 in the closing direction. and both contacts 4 and 5 are closed.

In addition, if an overcurrent of more than a predetermined value flows through the main current conductor 31 in a closed circuit state, the bimetal 3
7 is bent to the right in the figure due to the heat generated by the current, and its free end is connected to the trip adjustment screw 35.
Press to rotate the trip shaft 30 clockwise in the figure. Additionally, the instantaneous tripping electromagnet device 33 is actuated by the excessive current, and the instantaneous tripping rod 34 is thereby activated by the trip piece 3.
Lower 6. In this way, the tripshaft 30
When the is rotated clockwise, the embedded claws 30' and 2
The engagement with the secondary hook 29 and the engagement between the secondary hook 29 and the main hook 20 are sequentially released. Therefore, the secondary hook 29 and the main hook 20 rotate clockwise, and the engagement between the main hook 20 and the tripping lever 14 is finally released. Thereafter, the tripping lever 14 is rotated counterclockwise to deeply bend the pair of toggle links 11 and 13, thereby pulling up the contact holder 7. In this way, a trip state is established in which the movable contact 5 is separated from the fixed contact 4 and the current is cut off.

In the next closing operation, from the trip state,
Turn the operating handle 17 in the trip position to “OFF”
move in the direction. As a result, the tip of the tripping lever 14 rotates the main hook 20 counterclockwise, resulting in a reset state in which the tripping lever 14 and the main hook 20 are engaged.

Conductors 39, 39', one end of which is connected to the intermediate connecting terminal 32 on the lead-out side of the main current conductor 31 of each pole;
39'' passes through the zero-phase current transformer 38, and the other end is led out to the output terminal 40.

As shown in the circuit diagram of FIG. 4, the earth leakage detection tripping element 41 includes the main components of the zero-phase current transformer 38, the earth leakage detection circuit section 42, the earth leakage circuit transformer 43, and the earth leakage tripping mechanism section 44. consisting of conductor 3
9, 39', and 39'' is detected by the zero-phase current transformer 38. When the leakage current detected by the zero-phase current transformer 38 exceeds a set value, the leakage detection circuit 42 operates and outputs an output signal. This output signal causes the earth leakage trip mechanism 44 to operate and press the trip piece 36 of the trip mechanism 28. Therefore, the trip shaft 30 rotates, thereby causing the opening/closing mechanism to collapse. , the movable contact 5 separates from the fixed contact 4.

The earth leakage tripping mechanism section 44 is shown in FIGS. 1 and 3.
As shown in the figure, the main opening/closing mechanism of the circuit breaker is installed in the upper space of the storage partition between the poles separated by the partition and the adjacent pole.

FIG. 5A is a plan view showing the earth leakage tripping mechanism section in a steady ON state, and FIG. 5B is a front view thereof. FIG. 6A is a plan view showing the earth leakage tripping mechanism section in the earth leakage tripping state, and FIG. 6B is a front view thereof. FIG. 7A is a plan view showing the earth leakage tripping mechanism in a reset state, and FIG. 7B is a front view thereof.

In these figures, the mounting frame 45 of the earth leakage tripping mechanism 44 includes a bottom bent piece 45b from the center of the side frame member 45a, a folded piece 45a' that becomes the side frame on the other side, and a top face on one end side. The bent piece 45c and mounting legs 45d and 45d', which are attached to the internal member of the circuit breaker on the other side, are integrally formed. The electromagnet device 46 also includes an exciting coil 47, a fixed core 48, and an armature 49.
, a yoke 50 , and a return spring 51 . The mounting member 50a, which is bent from one side of the L-shaped yoke 50 of the electromagnet device 46, is attached to the bottom bent portion 4 of the mounting frame 45 so that the armature 49 faces the side frame member 45a of the mounting frame 45.
5b and is attached. One end of the latch member 52 is bent to form a first engager 52a. The first engager 52a protrudes into the cut groove 45e of the side frame member 45a of the mounting frame 45, and engages with the free end edge of the armature 49 in the open position with respect to the fixed core 48 in a freely engaging and releasing manner. match. The other end portion 52b of the latch member 52 is bent so that its side surface forms a U-shape, and the bottom bent portion 45 of the mounting frame 45
It is rotatably attached to a latch support shaft 53 provided at b. A latch spring 54 is mounted around the latch support shaft 53, one end of which is attached to the mounting frame 45, and the other end of which is attached to the latch member 52. And the latch member 52
Due to the function of this latch spring 54,
It is always urged to rotate clockwise in the figure with the support shaft 53 as a fulcrum.

A second engaging member 52c protrudes from the U-shaped clip portion of the other end portion 52b of the latch member 52.
This second engaging element 52c engages with a cut groove 55a provided on the lower side of the trigger member 55 so as to be able to be released and engaged. The trigger member 55 is a trigger lever 56
and a trigger rod 57. Trigger Rod 5
7 is attached to one side of the trigger lever 56. The length of the trigger rod 57 protruding from one side of the trigger lever 56 is adjustable. The tip of the trigger rod 57 is located at a position corresponding to the trip piece 36 of the tripping mechanism section 28. A reset lever 58 is integrally connected to the other side of the trigger lever 56 via a connecting member 59. The reset lever 58 is formed in a U-shape, and one side of the parallel side member is connected to the trigger member 55, and the other side member is extended to form an engaging arm 58a. Further, a pressing plate 6 made of an elastic material is provided on the protrusion 58b extending downwardly of the reset lever 58.
0 is attached integrally.

Further, the reset lever 58 is rotatably supported by a support shaft 61 provided on the side frame member 45a of the mounting frame 45. A trigger spring 62 is attached to the support shaft 61 so as to be wound around it, and one end of the trigger spring 62 is attached to the mounting frame 4.
5c, and the other end is the reset lever 5.
It is attached to 8. In this way, the trigger spring 62 always urges the reset lever 58 to rotate clockwise. Trigger lever 56
A longitudinally long guide groove 56a is provided in the central portion of the mounting frame 45, and a guide screw 63 screwed into the folded portion 45a' of the mounting frame 45 is disposed in this guide groove 56a. Therefore, when the reset lever 58 rotates about the support shaft 61, the trigger member 55 moves linearly while guiding the guide screw 63 in its guide groove 56a.

FIG. 8 shows a mirror body 66, a display member 67a, and a display rod 6, which are the main components of the earth leakage display device 64.
7 is an exploded perspective view showing how the parts are attached, and FIG. 9 is a sectional view showing the attached state.

The mirror body 66 is entirely made of a transparent material such as glass or acrylic resin, and includes a columnar portion 66b and a flange-like portion 66a formed at one end of the columnar portion 66b.
including. A conical recess is formed at the other end of the columnar portion 66b. In this embodiment, the recess is conical. A mirror surface 66c is formed on the surface of the conical recess by, for example, vapor deposition of aluminum. The mirror body 66 is attached to a position corresponding to the display window 1c (FIG. 3) provided on the closing jacket so as to be visible from the outside. Therefore, the apex of the mirror surface 66c formed on the conical slope faces the display window 1c. In addition, the mirror body 66
The conical recess formed on the other end side is preferably conical, but is not limited to this, and may be a pyramidal recess.

The display member 67a has an inner circumferential surface that can surround the columnar portion 66b of the mirror body 66, and includes display information on the inner circumferential surface.

The display member 67a is slidably stored in the storage space 65a of the storage member 65 fixed to the upper bent piece 45c of the mounting frame 45 via a screw 68. Specifically, a through hole 65c communicates with the bottom surface 65b that defines the lower end of the storage space 65a.
The display member 67a is fixed to one end 67c of a display rod 67 that extends through the through hole 65c. The lower end of the display rod 67 is bent and bent part 67b
Configure. The bent portion 67b is inserted into a guide hole 45f provided in the side frame member 45a of the mounting frame 45. The guide hole 45f is formed long enough to linearly displace the position of the bent portion 67b of the display rod 67. Therefore, the display rod 67
The display member 67a fixed to one end of the storage member 65 can slide within the storage space 65a of the storage member 65.

Further, as shown in the figure, a spring 69 is arranged at the lower end of the display member 67a arranged in the storage space 65a of the storage member 65, and therefore the display member 67a is moved by the action of this spring 69. It is always urged to move upward in the figure.

The storage space 65a of the storage member 65 is
The upper opening is closed by a mirror body 66 attached to the mirror body 5 . Here, the mirror body 66 is in a positional relationship corresponding to the display window provided in the closure jacket, as described above. The display member 67a is linearly movable as described above. The amount of displacement is selected such that the display member 67a and the mirror surface 66c of the mirror body 66 have the following positional relationship. That is, when the display member 67a moves upward in the figure, the inner peripheral surface of the display member 67a becomes the mirror surface 66.
c, and when the display member 67a moves downward in the figure, its inner peripheral surface is in a second position not surrounding the mirror surface 66c.

As shown in FIGS. 5 to 7, the tip of the engaging arm 58a of the reset lever 58 is connected to the display rod 67.
It is provided so that it can be freely engaged with and released from the bent portion 67b. The engaging arm 58a is rotatable about the support shaft 61. Therefore, for example, in FIG. 5B, when the engaging arm 58a rotates counterclockwise, it engages with the bent portion 67b,
When the engaging arm 58a rotates clockwise in the figure, the engagement with the bent portion 67b is released.
When the engaging arm 58a and the bent portion 67b are engaged, the display rod 67 is in the second position described above (the position where the inner peripheral surface of the display member 67a does not surround the mirror surface 66c), and the engaging arm 58a and bending part 67
b is not engaged, the display rod 67 is in the first position (the inner circumferential surface of the display member 67a is a mirror surface 66c).
).

In the embodiment shown, the earth leakage indicator according to the invention comprises an indicator window 1 provided in the closure envelope.
c (Fig. 3), a mirror body 66, a display member 67a,
The display rod 67, the electromagnetic device 46 that operates in response to a leakage signal, and the display member 67a that is displaced in accordance with the operation of the electromagnetic device 46, thereby moving the display member 67a between the first position and the second position. and a displacement member that allows. Here, the displacement member is composed of a trigger member 55 and a reset lever 58. How the earth leakage display device having such a configuration works when used in an earth leakage breaker or earth leakage relay will be described below.

The earth leakage detection circuit section 42 detects an electric leakage, and the output signal is sent to the electromagnet device 46 of the earth leakage tripping mechanism section 44.
When applied to the excitation coil 47 of the fixed core 48
is excited and attracts amateur 49. Thereby, the engagement between the first engager 52a of the latch member 52 and the armature 49 is released, and then the second engager 52c of the latch member 52 and the trigger member 5 are released.
5 is disengaged from the cut groove 55a. Therefore, the reset lever 58 is rotated clockwise about the support shaft 61 by the accumulated force of the trigger spring 62. As the reset lever 58 rotates, the trigger member 55 moves rightward, for example in FIG. 5B, while sliding the guide screw 63 in its guide groove 56a. By this movement to the right, the tip of the trigger rod 57 presses the trip piece 36 of the tripping mechanism section 28, causing the trip shaft 30 to rotate. In this way, the opening/closing mechanism is collapsed in the same manner as when an overcurrent flows, and the interrupting section is opened in a trip state.

During this operation, that is, when the trigger member 55 moves rightward in the figure and the reset lever 58 rotates clockwise in the figure, the engaging arm 58a and the lower end bent portion 67 of the display rod 67
The engagement with b is released. As described above, the display member 67a is always urged to move upward by the action of the spring 69. Therefore, when the engagement arm 58a of the reset lever 58 and the bent portion 67b of the display rod 67 are released, the display member 67a moves to the first position.
In the first position, the inner peripheral surface of the display member 67a surrounds the mirror surface 66c of the mirror body 66. Display information is provided on the inner peripheral surface of the display member 67a.
For example, characters, graphics, symbols, colors, or a combination thereof may be used as the displayed information. In this embodiment, it is assumed that yellow color is used as the display information. When the display member 67a is in the first position surrounding the mirror surface 66c, the yellow color applied to the inner peripheral surface of the display member 67a is reflected through the mirror surface 66c of the mirror body 66, and is visible through the display window 1c of the closed envelope. be done. In this way, it can be clearly confirmed that the earth leakage circuit breaker or earth leakage relay is in a current leakage state.

Note that when the display member 67a is in the second position not surrounding the mirror surface 66c, the inner peripheral surface defining the storage space 65a of the storage member 65 is reflected through the mirror surface 66c. Therefore, if the inner circumferential surface of the storage member 65 is colored, for example, black or the same color as the closing envelope, those colors can be visually observed from the display window in a normal state, that is, in a state where there is no current leakage.

The operating handle 17 is removed from a trip state due to electrical leakage.
When the lever is reset in the OFF direction, the trip lever 14 and the main hook 20 are engaged. At the same time, an insulated reset rod member 1 is fixed to the opening/closing lever 18 that is integrated with the operating handle 17, and extends through the partition wall to the adjacent pole.
8b presses the pressing plate 60 attached to the lower end of the reset lever 58 of the earth leakage tripping mechanism section 44 (FIG. 6B). Thereby, the reset lever 58
For example, in FIG. 6B, the trigger spring 62 is rotated counterclockwise, and the trigger spring 62 is wound up. As the reset lever 58 rotates, the trigger member 55 moves to the left in the drawing, whereby the cut groove 55a of the trigger member 55 and the second engagement member 52c of the latch member 52 engage with each other. At about the same time, the first engager 52 of the latch member 52
a and the armature 49 of the electromagnet device 46 are engaged, and the lower end bent portion 67b of the display rod 67 and the tip of the engagement arm 58a of the reset lever 58 are engaged, and the display member 67a is moved to the second position. Pull it down to the position and hold it in that position. In this state, the force is stored by the trigger spring 62, and the earth leakage tripping mechanism 44 is reset in the 7th A.
The state shown in the figure and FIG. 7B is reached.

Effects of the Invention As described above, according to the present invention, since the displayed information is reflected on the conical mirror surface and made visible from the front of the closure envelope, the display area is large and the circuit of the earth leakage breaker or earth leakage relay is The condition can be clearly identified and confirmed. Further, the earth leakage display device according to the present invention can maintain the display state after operation even if the power is turned off, like a mechanical display type earth leakage display device.

Further, the earth leakage display device according to the present invention does not have a display button that projects outside the closure envelope when indicating the earth leakage condition. Therefore,
It is now possible to attach accessories, such as an external handle or an electric operating device, to the closure jacket, something that has not been possible with conventional electrical leakage indicators of mechanical display type.

Furthermore, since the mirror surface that reflects the displayed information is shaped like a cone, there are fewer blind spots when viewing this display from the front of the closure envelope.In particular, if the mirror surface is shaped like a cone, such blind spots can be almost completely eliminated. Therefore, it is possible to clearly see the displayed information from the front side of the closure jacket.

[Brief explanation of drawings]

FIG. 1 is a front view showing an earth leakage breaker equipped with an embodiment of an earth leakage display device according to the present invention;
Part of it is shown broken away to show the inside. FIG. 2 is a side sectional view taken along line - in FIG. 1. FIG. 3 is a side sectional view taken along line - in FIG. 1. FIG. 4 is a circuit diagram for detecting earth leakage. FIG. 5A is a plan view showing the earth leakage tripping mechanism section in a steady ON state, and FIG. 5B is a front view thereof. FIG. 6A is a plan view showing the earth leakage tripping mechanism section in the earth leakage tripping state, and FIG. 6B is a front view thereof.
FIG. 7A is a plan view showing the earth leakage tripping mechanism in a reset state, and FIG. 7B is a front view thereof. FIG. 8 is an exploded perspective view showing how the mirror body, display member, and display rod, which are the main components of one embodiment of the earth leakage display device according to the present invention, are attached. FIG. 9 is a sectional view showing the attached state. In the figure, 1 is a closed jacket, 1c is a display window, and 4
6 is an electromagnet device, 55 is a trigger member, 58 is a reset lever, 66 is a mirror body, 66c is a mirror surface, 67 is a display rod, and 67a is a display member.

Claims (1)

[Scope of Claims] 1. An earth leakage display device used in an earth leakage breaker or earth leakage relay equipped with a closure envelope, comprising: an electromagnetic device disposed within the closure envelope and operated in response to an earth leakage signal; a displacement member disposed inside the enclosure and displaced from a normal position to an abnormal position in accordance with the operation of the electromagnetic device; a display window provided in the closure enclosure so as to be visible from the outside; a mirror body fixed at a position facing the display window and having a mirror surface formed in a conical slope with an apex facing the display window; and a display means movable between a first position close to the mirror body and a second position close to the displacement member side along a path connecting the displacement member and the mirror body; a spring disposed within the closure envelope and biasing the display means to the first position;
The display means has an inner peripheral surface that surrounds the mirror surface when the display means is brought to the first position, and display information is displayed on the inner peripheral surface. an indicator rod being fixed to the indicator member and retaining the indicator means in the second position by engaging the displacement member when the displacement member is in the normal position; An earth leakage display device comprising: and .