JPH1125841A - Electric leakage breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify and miniaturize through the release of a latch of a switching mechanism by means of the movement of a plunger, so as to forcibly open a contact part, placing in a housing in a manner capable of protruding and withdrawing, energizing in the protruding direction by a spring and releasably interlocking in the withdrawn state with the plunger at a reset position. SOLUTION: When a handle 2 is turned from the off-position to the on- position with a latch member interlocking with a trip member 50, a link 40 turns a drive member 32 by pushing a latch member 41, and pulls and energizes an opening spring so as to close movable contact 23. The closing of the movable contact 23 causes a current to flow between a terminal 24 and a terminal screw 29. A leakage-indicating device 7 that is protruded and energized by a spring 62 is formed so as to interlock with a plunger 10 at a reset position and to cancel the interlock with the movement of the plunger 10. In this way, a special member for maintaining the leakage-indicating device 7 in the state accumulating a power in the direction protruding from a housing 1 becomes unnecessary, so that the reduction in the number of components is realized.

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 disposed in a storage portion 201 formed in a container 200, and an electric leakage display device 204 is disposed 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 driving member 206. Further, the electric 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 electric 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 locked state with the driving member 206 is released, and the leakage display device 204 is returned to the return spring 209. Is projected from the body 200 by the spring force of (1) to display the leakage state.

[0004]

However, in this conventional example, an extra member such as a driving member 206 is required, or a tension spring 209 must be provided between the driving member 206 and the body 200. However, there is a problem that the structure is complicated and compactness cannot be achieved. Therefore, an object of the present invention is to provide an earth leakage breaker capable of simplifying an earth leakage display structure and achieving downsizing.

[0005]

According to a first aspect of the present invention, there is provided an earth leakage breaker including a body housing a plurality of contact portions, a handle provided on the body and partially protruding outside, and operation of the handle. An opening and closing mechanism that drives the opening and closing of the contact portion in conjunction with
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 switching mechanism in a state where the power of the switching mechanism is accumulated in a normal state. A trip mechanism for releasing the latch of the opening / closing mechanism by the operation of the plunger and forcibly opening the contact portion, and a bias mechanism that is disposed so as to be able to protrude and retract into the body and is urged by a spring in a projecting direction. And an earth leakage display device that can be detachably engaged with the plunger at the return position in the retracted state.

According to the first aspect of the present invention, the leakage display device which is urged by the spring is locked to the plunger at the return position and unlocked by the operation of the plunger. As compared with the above, a special member for holding the electric leakage display device in a state of accumulating the force in the direction protruding from the body becomes unnecessary, the number of parts can be reduced, the electric leakage display structure can be simplified, and Compactness can be achieved.

According to a second aspect of the present invention, in the first aspect, the leakage display device has a pressed portion, and the handle is engaged with the pressed portion to move the handle to the off side. Thereby, the electric leakage display device has a pressing portion for causing the electric leakage display device to retreat into the body. According to the earth leakage breaker of claim 2, in addition to the effect of claim 1, a special member for returning the earth leakage display device in conjunction with the steering wheel is not required, 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 first or second aspect, an interlocking member for tripping 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 is provided.
Alternatively, in addition to the effect of the second aspect, the contact can be forcibly opened when a leakage current flows, and the interlocking member is interposed, so that there is little restriction on the arrangement relationship between the trip mechanism and the electromagnet device.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. That is, the earth leakage breaker has a housing 1, a handle 2, an opening / closing mechanism 3, an earth leakage detecting means 4, an electromagnet device 5, a trip mechanism 6, and an earth leakage display device 7. The housing 1 houses a plurality of contact portions 8. As shown in FIG. 2, a pair of side cases 15, 16 are provided.
And an intermediate case 17, and contact portions 8 are provided between the intermediate case 17 and the side case 15 and between the intermediate case 17 and the 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 to each other by a connecting member 18 'having the same configuration.

The contact portion 8 includes a fixed contact 21 having a fixed contact 20 and a movable contact 2 which comes into contact with and separates from the fixed contact 20.
2 comprises a movable contact 23. The fixed contact 21 is provided with a terminal 24 having a quick connection structure at the rear end. 25 is an unlocking lever. A flexible electric wire 2 is provided at the rear end of the movable contact 23.
6, one end of a bimetal 27 is connected, and 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. Reference numeral 30 denotes a bimetal adjustment screw.

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

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

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 set in a shorter dimension than the side cases 15 and 16 so as to be stored in the storage space 42 formed at the bottom of the side cases 15 and 16. The leakage detecting means 4 is a zero-phase current transformer 9 for detecting an unbalanced current in an electric circuit which is opened and closed by a contact portion 8.
The leakage detection circuit 44 includes an amplifier that outputs a signal when the unbalanced current detected by the zero-phase current transformer 9 exceeds the sensitivity current, and an output signal of the amplifier. And a switching element configured by a thyristor, a transistor, or the like that is turned on when it is turned on. The switching element is connected in series to the electromagnet device and connected to the output of the amplifier. As shown in FIG. 8, the zero-phase current transformer 9 pierces the core with the flexible electric wire 26 of each pole as a primary winding and winds a secondary winding around the core. The leakage detection circuit 44 is configured by mounting circuit components on a printed circuit board, and the zero-phase current transformer 9 is also mounted on the printed circuit board.

The electromagnet device 5 has a plunger 10 that operates according to the output of the leakage detecting means 4. The electromagnet device 5 according to the embodiment is housed in a housing 46 formed adjacent to the handle 2 by the side case 15 and the intermediate case 17. The plunger 10 projects in the direction toward the handle 2 and in the opposite direction, for example, as shown in FIG. 17, and moves in a direction approaching the handle 2 by operation. When an exciting current flows from the amplifier to the coil of the electromagnet device 5 to excite it, the plunger operates in a direction approaching the handle 2. The electromagnet device 5 is provided with a projecting spring receiving portion 47 protruding from the side case 16 as shown in FIG.

In the normal state, the trip mechanism 6 latches the opening / closing mechanism 3 in a state where the power of the opening / closing mechanism 3 is accumulated, and releases the latch of the opening / closing mechanism 3 by the operation of the plunger 10 to forcibly open the contact portion 8. In the embodiment, a latch locking portion that locks the other end of the latch member 41 in a state where the driving member is pressed by one end of the latch member 41 and the opening spring 52 is pulled so that the movable contact 23 closes. A tripping member 50 having the above-mentioned bimetal 27 for thermally tripping the tripping member 50 by an overcurrent to trip the tripping member 50, and surrounding the bimetal 27 attached to the terminal plate 28. A U-shaped magnetic body 55 for concentrating magnetic flux generated by a short-circuit current flowing through the bimetal 27, and a tripping member 5 facing the magnetic body 55.
0, and a magnetic plate 56 that is attracted to the magnetic body 55. The tripping member 50 penetrates through the hole of the intermediate case 17 and is axially supported by the shaft 66 in the bearing holes 57 of the side cases 15 and 16, and is hung between the handle 2 and the tripping member 50 to turn off the handle 2. The return is urged by a spring 58 urged in the direction. Therefore, an overcurrent due to the bimetal 27 and a short-circuit current due to the magnetic body 55 can be detected, and the contact 8 can be forcibly opened by these abnormal currents.

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. As shown in FIG. The intermediate piece 13c is slidably supported by the groove 60 formed in the side case 15 and is held down by the intermediate case 17, and the movement direction is such that the Z-shaped bent portion of the intermediate piece 13c is bent by the protruding strip 60a forming the groove 60. The stopper is locked by being locked to the end and the end of the protruding strip 60b. Therefore, when the plunger 10 is operated by the operation of the electromagnet device 5, the interlocking member 13 is pushed and moved by the tip 10a of the plunger 10, and the tripping member 50 is tripped.

The electric leakage display device 7 is disposed so as to be able to protrude and retract in the housing 1 and is urged by a spring 62 in a protruding direction, and engages with the plunger 10 at the return position when the electric leakage display device 7 is retracted. It can be detachably locked. In the embodiment, a vertically long main body 69, a display part 68 provided at the upper end of the main body 69 and inserted through a circular hole 66 formed by the intermediate case 17 and the side case 16 so as to be freely protruded and retracted, Body 6
9, a pressed portion 11 protruding toward the handle 2 from the handle 9, a plunger locking portion 70 having a concave portion that is disposed on the retreating operation side of the plunger 10 of the electromagnet device 5 and engages with the rear end portion 10 b of the plunger 10. A spring receiving portion 71 provided at a lower end portion of the main body 69. In the electric leakage display device 7, the main body 69 is located on the side surface of the electromagnet device 5, the plunger engaging portion 70 is arranged so as 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. The compression coil spring is urged between the portion 47 and the spring 62 according to the embodiment, and is locked by the plunger 10 at the retracted position to maintain the immersion posture of the leakage display device 7.

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

The operation of the earth leakage breaker will be described.
1 is an on state, and FIG. 14 is an off state. When the handle 2 is turned from the off position of FIG. 14 to the on position of FIG. The latch member 41 is pressed to rotate the drive member 32 to pull and bias the opening spring 52 so that the movable contact 23 closes. The handle 2 is stabilized at the position shown in FIG. The closing of the movable contact 23 allows a current to 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 bends due to the thermal operation and presses the lower end of the tripping member 50 to rotate the tripping member 50 to trip the latch member 41. As a result, the restoring force of the opening spring 52 acts to rotate the driving member 32 so as to push up the latch member 41, and the movable contact 23
Open the pole. The latch member 41 is engaged with a stopper 90 provided on the side case at a position where the handle 2 maintains the neutral position as shown in the figure. When the bimetal 27 cools naturally and returns after opening, the handle 2 is turned off. This results in link 40
The latch member 41 is locked to the latch locking portion 54 of the tripping member 50 via the latching member 50 to be in the off state.

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 body 55 faster than the bimetal 27 bends, the tripping member is tripped, and the movable contact 23 is moved as described above. Open the pole. FIG. 17 shows a trip operation in the event of a leakage. If there is a leakage, a detection output due to the unbalanced current appears in the zero-phase current transformer 9 and is amplified by the leakage detection circuit to output an electromagnet drive current. As a result, when the electromagnet device 5 operates and the plunger 10 protrudes, the interlocking member 13 moves to operate the tripping member 50 to trip.
3 opens. Further, when the plunger 10 protrudes, the engagement of the plunger locking portion 70 of the electric leakage display device 7 locked to the rear end of the plunger 10 is released, so that the electric leakage display device 7 protrudes from the body 1 by the spring force of the spring 62, and the electric leakage occurs. Display. After the recovery from the accident, the steering wheel 6 is moved to the off position to reset. However, when the steering wheel 6 is moved to the off position, the pressing portion 12 of the handle 2 presses the pressed portion 11 to move the electric leakage display device 7 inside the body 1. The spring is retracted against the spring 62 and locked on the plunger 10 that has already returned.

According to this embodiment, the earth leakage display device 7 projected and urged by the spring 62 is locked to the plunger 10 at the return position and unlocked by the operation of the plunger 10. As compared with the above, a special member for holding the power leakage display device 7 in a state of accumulating the force in the direction protruding from the housing 1 becomes unnecessary, the number of parts can be reduced, and the power leakage display structure can be simplified. The body 1 can be made compact.

The electric 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, thereby retreating the electric leakage display device 7 into the body 1. With the pressing portion 12 to be operated, the handle 2
A special member for returning the earth leakage display device 7 in conjunction with is unnecessary, 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. Since the interlocking member 13 is interposed, there is little restriction 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, the earth leakage display device projected and urged by the spring is locked to the plunger at the return position and unlocked by the operation of the plunger. Compared with the conventional example, a special member for holding the power leakage display device in a state of accumulating the force in the direction protruding from the body becomes unnecessary, the number of parts can be reduced, the leakage current display structure can be simplified, and the device can be simplified. 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. Can be performed and the body can be made compact.
According to the earth leakage breaker of the third aspect, in addition to the effects of the first or second aspect, the contact can be forcibly opened when a leakage current flows, and the interlocking member is interposed. There are few restrictions on the positional relationship between the trip mechanism and the electromagnet device.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention, in which a side case in an ON state is removed.

FIG. 2 is an overall exploded perspective view.

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 electric leakage display device, and an interlocking member.

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

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

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

FIG. 9 is a side view of 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 a relationship among an electromagnet device, an interlocking member, and a tripping member.

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

FIG. 12 is an external perspective view.

FIG. 13 is an end view.

FIG. 14 is a cross-sectional view in an off state.

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

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

FIG. 17 is a cross-sectional view of a ground fault trip state.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Handle 3 Opening-and-closing mechanism 4 Electric leakage detection means 5 Electromagnet device 6 Trip mechanism 7 Electric leakage display device 8 Contact part 9 Zero-phase current transformer 10 Plunger 11 Pressed part 12 Pressing part 13 Interlocking member 62 Spring

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takanobu Tanaka 1048 Kadoma Kadoma, Kadoma City, Osaka Pref. (72) Inventor Yasushi Yasushi 1048 Kadoma Kadoma, Kadoma, Osaka Pref. Matsushita Electric Works

Claims (3)

[Claims] 1. A container housing a plurality of contact portions, a handle provided on the container and partially projecting to the outside, and an opening / closing mechanism for opening and closing the contact portion in conjunction with operation of the handle. A leakage detecting means having a zero-phase current transformer for detecting a leakage current, an electromagnet device having a plunger operated by an output of the leakage detecting means, and the switching mechanism in a state where power of the switching mechanism is accumulated in a normal state. A trip mechanism for releasing the latch of the opening / closing mechanism by the operation of the plunger and forcibly opening the contact portion, and a bias mechanism which is disposed so as to be able to protrude and retract into the body and is urged by a spring in a projecting direction. An earth leakage display device that can be removably locked to the plunger at the return position in the retracted state. 2. The electric leakage display device has a pressed portion, and the handle is engaged with the pressed portion and moves the handle to an off side, whereby the electric leakage display device is retracted into the body. The earth leakage breaker according to claim 1, further comprising a pressing portion for causing the leakage. 3. The earth leakage circuit breaker according to claim 1, wherein an interlocking member for tripping the trip mechanism when the plunger is operated is interposed between the electromagnet device and the trip mechanism.