JP3436080B2 - Earth leakage breaker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage breaker having an earth leakage display function.

[0002]

2. Description of the Related Art Conventional examples (for example, JP-A-6-52784)
As shown in FIG. 18, an electromagnet device 203 having a plunger 202 is arranged in a storage portion 201 formed in a body 200, and a leakage display device 204 is arranged in front of the electromagnet device 203. A locked portion 207 of the driving member 206 is attached to a locking portion 205 provided below the display device 204.
And the plunger 202 is locked to the drive member 206. Further, the earth leakage display device 204 and the handle 20
8, a return spring 209 is attached, and the handle 208 is rotated from the neutral position to the off position to return the earth leakage display device 204 to the inside of the body 200. A tension spring 209 is provided between the drive member 206 and the body 200 so that the drive member 206 can be returned to the return position.

In this conventional example, the leakage current is detected, the plunger 202 of the electromagnet device 203 is attracted to the upper surface side of the body 200, the engagement state with the drive member 206 is released, and the leakage display device 204 returns to the return spring 209. The leakage force is displayed by projecting from the body 200 by the spring force of.

[0004]

However, in this conventional example, an extra member such as the driving member 206 is required, or the tension spring 209 must be arranged between the driving member 206 and the body 200. However, there is a problem that the structure is complicated and cannot be made compact. Therefore, an object of the present invention is to provide an earth leakage breaker which can simplify the earth leakage display structure and can be made compact.

[0005]

An earth leakage circuit breaker according to claim 1, wherein a body housing a plurality of contact portions, a handle provided on the body and a part of which protrudes to the outside, and an operation of the handle. An opening and closing mechanism that drives the contact portion to open and close in conjunction with
Leakage detection means having a zero-phase current transformer that detects a leakage current, an electromagnet device having a plunger operated by the output of this leakage detection means, and the opening / closing mechanism in a normal state in which the force of the opening / closing mechanism is accumulated. A trip mechanism that latches and unlocks the opening / closing mechanism at the tip of the plunger by the operation of the plunger to forcibly open the contact portion, and a trip mechanism that is arranged so that it can be retracted into and retracted from inside the body. An earth leakage breaker comprising: an earth leakage display device which is locked to the plunger in a state of being biased by a spring and which is released from an engagement state when the plunger is operated; A rear end of the plunger, the plunger engaging the rear end of the plunger in a return position, There is characterized in the provision of the plunger engaging portion out of the engagement with the rear end portion of the plunger when operated.

According to the earth leakage breaker of the first aspect, as compared with the conventional example, a special member for holding the earth leakage display device in a state in which the force in the direction of protruding from the body is accumulated is unnecessary, and the parts are The number of points can be reduced, the leakage display structure can be simplified, and the body can be made compact.

According to a second aspect of the present invention, there is provided an earth leakage breaker according to the first aspect, wherein the earth leakage display device has a pressed portion, and the handle is engaged with the pressed portion to move the handle to the off side. As a result, the earth leakage display device has a pressing portion for retracting the inside of the body. According to the earth leakage circuit breaker of the second aspect, in addition to the effect of the first aspect, a special member for interlocking with the handle for returning the earth leakage display device is unnecessary, and the number of parts can be further reduced.
The body can be made compact.

According to a third aspect of the present invention, in the earth leakage circuit breaker according to the first or second aspect, an interlocking member that trips the trip mechanism when the plunger operates is provided between the electromagnet device and the trip mechanism. Intervening. According to the earth leakage breaker of claim 3, claim 1
In addition to the effect of claim 2, the contact can be forcibly opened when a leakage current flows, and since the interlocking member is interposed, there are few restrictions on the arrangement relationship between the trip mechanism and the electromagnet device.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. That is, the earth leakage circuit breaker includes the body 1, the handle 2, the opening / closing mechanism 3, the earth leakage detecting unit 4, the electromagnet device 5, the trip mechanism 6, and the earth leakage display device 7. The body 1 houses a plurality of contact portions 8. As shown in FIG. 2, the pair of side cases 15, 16
And intermediate case 17, contact points 8 are provided between intermediate case 17 and side case 15 and between intermediate case 17 and side case 16, respectively, and as shown in FIG. The intermediate case 17 and the side case 15 are connected to each other, the intermediate case 17 and the side case 16 are connected to each other, and the side cases 15 and 16 are connected and combined with each other by a connecting tool 18 'having the same structure.

The contact portion 8 has a fixed contact 21 having a fixed contact 20 and a movable contact 2 which comes in contact with and separates from the fixed contact 20.
It comprises a movable contact 23 having two. The fixed contact 21 is provided with a terminal 24 having a quick-connecting structure at the rear end. 25 is an unlocking lever. The flexible electric wire 2 is provided at the rear end of the movable contact 23.
The bent piece 2 at one end of the terminal plate 28, which is connected to one end of the bimetal 27 via 6 and is bent into a substantially Z shape as shown in FIG.
The other end of the bimetal 27 is attached to 8a, and a terminal screw 29 is provided on the terminal plate 28. 30 is a bimetal adjusting screw.

As shown in FIG. 6, the pair of movable contacts 23 have intermediate portions inserted in grooves 33 provided on both sides of the driving member 32, and are held by contact pressure springs 34, respectively.
The drive member 32 has shafts 35 on both sides, and the intermediate case 1
7 is rotatably supported in shaft supporting holes 54 provided in the side cases 15, 16. The handle 2 is provided on the body 1 and a part thereof projects to the outside. In the embodiment, shafts 37 are provided on both sides of the handle 2, and the shaft 37 is rotatably supported in bearing holes 38 formed in the side cases 15 and 16 through the intermediate case 17 (see FIG. 2).

The opening / closing mechanism 3 opens / closes the contact 8 in association with the operation of the handle 2. In the embodiment, the U-shaped link 40, one end of which is connected to the handle 2, and the link 4
The latch member 41 has an intermediate portion connected to the other end of 0, and a driving member 32 that is pressed by one end portion of the latch member 41. The driving member 32 is biased in the direction in which the movable contact 23 is opened by the opening spring 52 using a tension coil spring.

The leakage detecting means 4 has a zero-phase current transformer 9 for detecting a leakage current. In the embodiment, the intermediate case 17 is stored in the storage space 42 formed at the bottom of the side cases 15 and 16 by setting the intermediate case 17 to be shorter than the side cases 15 and 16. The leakage detecting means 4 is a zero-phase current transformer 9 that detects an unbalanced current in the electric path opened and closed by the contact portion 8.
And the leakage detection circuit 44. The leakage detection circuit 44 outputs an amplifier and a signal of the output of the amplifier when the unbalanced current detected by the zero-phase current transformer 9 exceeds the sensitivity current. In this case, the switching element is composed of a thyristor and a transistor which are turned on when the switching element is turned on. In the zero-phase current transformer 9, as shown in FIG. 8, the flexible electric wire 26 of each pole is passed through the core as a primary winding, and the secondary winding is wound around the core. The leakage detection circuit 44 is configured by mounting circuit components on a printed board, and the zero-phase current transformer 9 is also mounted on the printed board.

The electromagnet device 5 has a plunger 10 which operates by the output of the electric leakage detecting means 4. The electromagnet device 5 of the embodiment is housed in a housing portion 46 formed adjacent to the handle 2 by the side case 15 and the intermediate case 17. The plunger 10 is moved for example projecting direction and opposite side faces <br/> handle 2 as shown in FIG. 17, in a direction approaching to the handle 2 by the operation. When an exciting current flows from the amplifier to the coil of the electromagnet device 5 and is excited, the plunger moves toward the handle 2. This electromagnet device 5 is provided with a protruding spring receiving portion 47 which is provided so as to project on the side case 16 side as shown in FIG.

In a normal state, the trip mechanism 6 latches the opening / closing mechanism 3 in a state where the force of the opening / closing mechanism 3 is accumulated, and the plunger 10 operates to release the latching of the opening / closing mechanism 3 to forcibly open the contact portion 8. In the embodiment, the latch locking portion that locks the other end of the latch member 41 in a state where the opening spring 52 is pulled so that the movable contact 23 is closed by pressing the driving member by one end of the latch member 41. A tripping member 50 having 54, the above-mentioned bimetal 27 for tripping the tripping member 50 by thermally operating the tripping member 50 by an overcurrent, and surrounding the bimetal 27 attached to the terminal plate 28. A U-shaped magnetic body 55 that concentrates the magnetic flux generated by the short-circuit current flowing through the bimetal 27, and the trip member 5 so as to face the magnetic body 55.
And a magnetic plate 56 attached to the magnetic body 55 and attracted to the magnetic body 55. The trip member 50 penetrates the hole of the intermediate case 17 and is pivotally supported by the shaft 66 in the bearing holes 57 of the side cases 15 and 16, and is hooked between the handle 2 and the trip member 50 to turn off the handle 2. The spring 58 for urging in the direction urges the return. Therefore, the overcurrent caused by the bimetal 27 and the short-circuit current can be detected by the magnetic body 55, and the contact portion 8 can be forcibly opened by these abnormal currents.

Further, as shown in FIG. 5, an interlocking member 13 for tripping the trip mechanism 6 when the plunger 10 operates is interposed between the electromagnet device 5 and the trip mechanism 6. The interlocking member 13 of the embodiment has a substantially U shape in plan view, an intermediate piece 13c thereof is bent in a Z shape in the vertical direction, one end 13a faces the tip 10a of the plunger 10, and the other end 13b is shown in FIG. Thus, it faces the trip member 13. The intermediate piece 13c is slidably supported in the groove 60 formed in the side case 15 and is pressed by the intermediate case 17, and the Z-shaped bent portion of the intermediate piece 13c forms the groove 60 in the moving direction. The end portions and the end portions of the protruding strips 60b are locked to prevent them from coming off. Therefore, when the plunger 10 is operated by the operation of the electromagnet device 5, the interlocking member 13 is pushed by the tip 10a of the plunger 10 to move, and the tripping member 50 is tripped to operate.

The earth leakage display device 7 is arranged so as to be retractable in the body 1 and is urged by a spring 62 in a protruding direction. When the earth leakage display device 7 is in the retracted state, it is engaged with the plunger 10 in the return position. Can be detachably locked. In the embodiment, a vertically long main body 69, a display portion 68 that is provided at the upper end of the main body 69 and is inserted into and retractable from a circular hole 66 formed by the intermediate case 17 and the side case 16, Body 6
A pressed portion 11 that protrudes from 9 toward the handle 2, a plunger locking portion 70 that has a concave portion that is arranged on the retracting side of the plunger 10 of the electromagnet device 5 and that engages with the rear end portion 10b of the plunger 10. It has a spring receiving portion 71 provided at the lower end of the main body 69. In this leakage display device 7, the main body 69 is located on the side surface of the electromagnet device 5, the plunger locking portion 70 is arranged to face the rear end portion 10b of the plunger 10, and the spring receiving portion 71 and the spring receiving portion of the electromagnet device 5 are arranged. A compression coil spring is urged to protrude from the portion 47 by a spring 62 according to the embodiment, and this is locked by the plunger 10 in the retracted position to maintain the retracted posture of the earth leakage display device 7.

The handle 2 has a pressing portion 12 that engages with the pressed portion 11 and moves the handle 1 to the off side to move the earth leakage display device 7 back into the body 1. 7
Reference numeral 5 is an earth leakage test button, for example, for supplying a signal for outputting an unbalanced current by energizing an electric wire that has separately penetrated as a primary wire of the zero-phase current transformer 9, and by pressing the earth leakage test button 75. The leakage detection signal is output to the leakage detection circuit, the electromagnet device 5 is driven, and the trip member 50 is operated. Reference numeral 76 is a shielding plate.

The operation of this earth leakage breaker will be described.
1 is in the ON state and FIG. 14 is in the OFF state. When the handle 2 is rotated from the OFF position of FIG. 14 to the ON position of FIG. The latch member 41 is pushed to rotate the drive member 32, and the opening spring 52 is pulled and biased so that the movable contact 23 is closed. The handle 2 is stabilized at the position shown in FIG. 1 beyond the inversion dead center. By closing the movable contact 23, a current can flow between the terminal 24 and the terminal screw 29.

FIG. 15 shows a trip operation when an overcurrent flows through the contact portion 8. At this time, the bimetal 27 thermally operates and bends, pressing the lower end portion of the trip member 50, rotating the trip member 50, and tripping the latch member 41. As a result, the restoring force of the opening spring 52 acts to rotate the drive member 32 so as to push up the latch member 41, and the movable contact 23
Open. The latch member 41 is locked to the stopper 90 provided on the side case at a position where the handle 2 maintains the neutral posture as shown in the figure. When the bimetal 27 naturally cools and returns after opening, the handle 2 is turned off. Link 40
The latch member 41 is engaged with the latch engaging portion 54 of the tripping member 50 via the and to be turned off.

FIG. 16 shows a trip operation when a short-circuit current flows through the contact portion 8. When a short-circuit current flows through the bimetal 27, the magnetic plate 56 is attracted by the magnetic flux generated in the magnetic material 55 faster than the bimetal 27 bends, and the tripping member is tripped to operate the movable contact 23 as described above. Open the contact. FIG. 17 shows a trip operation when an electric leakage occurs. When there is a leakage, a detection output due to an unbalanced current appears in the zero-phase current transformer 9, is amplified by the leakage detection circuit, and an electromagnet drive current is output. As a result, when the electromagnet device 5 operates and the plunger 10 projects, the interlocking member 13 moves and the tripping member 50 trips, and the movable contactor 2 operates as described above.
3 opens. Further, when the plunger 10 projects, the plunger locking portion 70 of the leakage display device 7 that is locked at the rear end of the plunger 10 is released, so that the leakage display device 7 projects from the body 1 by the spring force of the spring 62, causing a leakage. Display. After the accident recovery, the handle 6 is moved to the off position to be reset, but when the handle 6 is moved to the off position, the pressing portion 12 of the handle 2 presses the pressed portion 11 so that the earth leakage display device 7 is inside the body 1. It retracts against the spring 62 and locks on the plunger 10 which has already returned.

According to this embodiment, the leakage display device 7 biased by the spring 62 is locked to the plunger 10 in the return position and is unlocked by the operation of the plunger 10. Compared with the above, a special member for holding the leakage display device 7 in a state of accumulating the force in the direction of projecting from the body 1 is unnecessary, the number of parts can be reduced, and the leakage display structure can be simplified. The body 1 can be made compact.

The earth leakage display device 7 has a pressed portion 11, and the handle 2 is engaged with the pressed portion 11 to move the handle 2 to the off side, whereby the earth leakage display device 7 is retracted into the body 1. The handle 2 has the pressing portion 12 to be operated.
No special member is required for returning the earth leakage display device 7 in conjunction with, and the number of parts can be further reduced.
The body 1 can be made compact.

Since the interlocking member 13 for tripping the trip mechanism 6 when the plunger 10 operates is interposed between the electromagnet device 5 and the trip mechanism 6, it is possible to forcibly open the contact when a leakage current flows. In addition, since the interlocking member 13 is interposed, there are few restrictions on the positional relationship between the trip mechanism 6 and the electromagnet device 5.

[0025]

According to the earth leakage breaker of the first aspect of the present invention, as compared with the conventional example, a special member for holding the earth leakage display device in a state in which the force in the direction of protruding from the body is accumulated is unnecessary. The number of parts can be reduced, the leakage display structure can be simplified, and the body can be made compact.

According to the earth leakage breaker of the second aspect, in addition to the effect of the first aspect, a special member for returning the earth leakage display device in conjunction with the handle is unnecessary, and the number of parts is further reduced. And the body can be made compact.
According to the earth leakage circuit breaker of claim 3, in addition to the effect of claim 1 or claim 2, the contact can be forcibly opened when a leakage current flows, and the interlocking member is interposed. There are few restrictions on the layout relationship between the trip mechanism and the electromagnet device.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention with an on-state side case removed.

FIG. 2 is an exploded perspective view of the whole.

FIG. 3 is a perspective view showing a relationship between a side case and an intermediate case.

FIG. 4 is a perspective view showing a relationship between a driving member, a side case, and an intermediate case.

FIG. 5 is an exploded perspective view showing a relationship among a side case, an electromagnet device, an earth leakage display device, and an interlocking member.

FIG. 6 is a partially exploded perspective view showing a relationship between a movable contactor and a driving member.

FIG. 7 is a side view showing a relationship between a terminal provided with a bimetal and a trip member.

FIG. 8 is a side view showing a state where the contact portion is mounted on the side case before the intermediate case is stacked.

FIG. 9 is a side view showing a state in which one of the side cases is removed and a contact portion is attached to the intermediate case.

FIG. 10 is a side view showing the relationship between the electromagnet device, the interlocking member, and the trip member.

FIG. 11 is a side view showing the operation of the interlocking member for the earth leakage trip.

FIG. 12 is an external perspective view.

FIG. 13 is an end view.

FIG. 14 is a sectional view of an off state.

FIG. 15 is a sectional view of an overcurrent trip state.

FIG. 16 is a cross-sectional view of a short circuit trip state.

FIG. 17 is a cross-sectional view of an electric leakage trip state.

FIG. 18 is a sectional view of a conventional example.

[Explanation of symbols]

1 body 2 handles 3 open / close mechanism 4 Leakage detection means 5 Electromagnet device 6 Trip mechanism 7 Earth leakage display device 8 contact points 9 Zero-phase current transformer 10 Plunger 11 Pressed part 12 Pressing part 13 Interlocking member 62 spring

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takanobu Tanaka 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Yasushi Matsui 1048, Kadoma, Kadoma City, Osaka Matsushita Electric Works, Ltd. ( 56) References JP-A-8-161998 (JP, A) JP-A-6-52784 (JP, A) JP-A-8-96693 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 71/00-83/22

Claims (3)

(57) [Claims] 1. A container body accommodating a plurality of contact portions, a handle provided on the container body, a part of which protrudes to the outside, and an opening / closing mechanism for driving the contact portions to open and close in association with the operation of the handle. A leakage detection means having a zero-phase current transformer for detecting a leakage current, an electromagnet device having a plunger operated by the output of the leakage detection means, and the opening / closing mechanism in a normal state in which the force of the opening / closing mechanism is accumulated. Latch the tip of the plunger by the operation of the plunger.
A trip mechanism for releasing the latch of the opening / closing mechanism at the end to forcibly open the contact portion, and a plunger that is locked in the plunger while being retractably arranged in the body and biased by a spring in the protruding direction. When the is operated, the locked state is released and the leakage display device protruding from the body,
In the earth leakage breaker provided with, in the earth leakage display device, is arranged to face the rear end portion of the plunger, the plunger is engaged with the rear end portion of the plunger at the return position, the plunger An earth leakage circuit breaker, comprising a plunger locking portion that is disengaged from a state of being engaged with a rear end portion of the plunger when operating. 2. The earth leakage display device has a pressed portion, and the handle is engaged with the pressed portion to move the handle to the off side to retract the earth leakage display device into the body. The earth leakage breaker according to claim 1, further comprising a pressing portion. 3. The earth leakage breaker according to claim 1, wherein an interlocking member that trips the trip mechanism when the plunger operates is interposed between the electromagnet device and the trip mechanism.