JPH0560210B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small earth leakage circuit and disconnector that detects a leakage current in an electric circuit that has caused a ground fault and quickly opens the circuit. The purpose of this is to reduce the size and effectively utilize the internal space of the container.In particular, the opening/closing mechanism members are arranged in a vertical position rather than the horizontal position of the conventional example, thereby achieving overall miniaturization.

The present invention will be described in detail with regard to one embodiment.
In FIGS. 1 to 13, 1 is an insulating base; 2 is an insulating base;
is a cover, 3, 3' is an arc induction protrusion 4 on the free end,
4', and has proximal ends 6, 6' bent into an L shape to which fixed contacts 5, 5' are fixed, and a power terminal fitting 8, into which power terminal screws 7, 7' are screwed. The fixing plate 8' is fixed vertically to the inside of the insulating base.

Reference numerals 9 and 9' refer to proximal ends 12 and 9', which have movable contacts 10 and 10' fixed to and separated from the fixed contacts, and which are curved into an L shape with arc-inducing protrusions 11 and 11' formed at the free ends; A movable plate 12' is provided, and 13, 13' is a thermal tripping element with a proximal end 14, 1 formed in an L shape.
4' overlaps the base ends 12, 12' and is fixed perpendicularly to the inside of the insulating base, applying an opening urging force to the movable plate and facing the fixed plate. 15 has a hooking end 16 and adjusting screws 17, 17' at threaded ends 18, 18', and inserts the shaft 2 into the shaft hole 20 of the bearing 19.
1, a recessed locking end 23 is formed at the lower end of the actuating plate which is rotatably biased counterclockwise by a spring 22 and pivoted.

A first link 25 has a locking end 26, a shaft hole 27 provided at the other end is pivotally connected to a shaft hole 29 provided in the bearing by a shaft 28, and is biased to rotate counterclockwise by a spring 30. .

Reference numeral 31 has crossbars 33 and 33' that drive the vertical center portion 32 of the movable plate pivoted through a crossbar shaft 36 inserted through a vertical oval hole 34 and a horizontal oval hole 35 provided in the shaft support, and the other end. Shaft hole 7 provided in 37
9 includes a shaft hole 3 provided at the upper end of the first link.
A second link pivotally connected to 8 by a shaft 39 is provided with a sliding surface 40.

41 includes a drive end 42 formed to vertically drive the sliding surface 40 of the second link, and is pivotally connected to a shaft hole 43 provided at the upper end of the bearing by a shaft 44;
The handle is biased to move clockwise by a spring 45, and 46 is a resin case housing a zero-phase current transformer 48 to which lead wires 47 and 47' are connected, as well as a leakage amplification unit 49, and the upper part is made of an elastic metal plate. First hooking portions 51 and 5 that force-fit the test movable contactor 50 upward.
1', and forms a second hooking part 53 into which the test circuit resistor 52 is fitted, and the resistor lead wire 52'
is disposed as a fixed contact facing the movable contact, and has locking protrusions 55, 55' and guide walls 56, 56 for locking a pair of locking protrusions 54, 54' at the outer lower end. ' is formed on the inner bottom of the insulating base. Reference numeral 57 denotes a test button that drives the center portion of the test movable contact piece 50, and is inserted into a test button hole 59 formed in the cover.

60 is a coil lead wire 6 wound around a winding frame 61
2,62' electromagnetic coil 63 and return spring 6
4 and a movable iron core 66 equipped with a locking protrusion 65, and an L-shaped electromagnetic frame 6 on the outside.
7 is fitted therein, and latching protrusions 70, 71, 72, 73 are formed to be latched to latching walls 69, 69' provided at the periphery of the through hole 68 of the square hole of the insulating base. do.

Flexible conductor wires 74 and 74' have one end fixed to the center of the bimetal 13, pass through the hollow part 75 of the zero-phase current transformer 48, and are fixed to the end of the load terminal plate 76;
7 and 77' are load terminal fittings, and 78 and 78' are load terminal screws.

Next, the operating conditions of the above-mentioned electrical leakage and disconnection will be explained.

In FIG. 5, the locking end 26 of the first link 25
is locked to the locking end 16 of the actuating plate 15,
When the handle 41 is rotated counterclockwise to turn it on, the drive end 42 rotates while vertically sliding on the sliding surface 40 of the second link 31, and the second link rotates clockwise. The crossbar shaft 36, which is rotated and installed through a vertical oval hole 34 formed at the lower end, is driven clockwise and horizontally by the vertical circumferential edge 34' of the vertical oval hole, and is driven clockwise and horizontally by the shaft bearing 19 shown in FIG. The crossbar shaft 36 is guided in the horizontal direction by the horizontal peripheral edge 35' of the horizontal elliptical hole 35 formed in the horizontal elliptical hole 35, and the crossbars 33, 33' fitted on both outer sides are driven leftward in a horizontal state.

Along with the horizontal drive of the crossbar to the left,
A vertical central portion 3 formed at the center of the movable plates 9, 9'
2 is pressed and driven in the left direction, and the movable contacts 10 and 10' fixed to the free end are arranged facing each other.
The electric circuit is closed in a state in which the fixed contacts 5, 5' are contacted and a predetermined contact pressure and the opening biasing force of the movable plate are applied.

Therefore, as a reaction, the contact pressure acts on the sliding surface 40 of the second link 31 via the crossbar to rotate the drive end 42 of the handle 41 counterclockwise, so that the handle is in the closed state. maintain.

Next, when an overcurrent or short-circuit fault current exceeding a predetermined current flows in the electrical circuit to the thermal tripping elements 13, 13',
The thermal tripping element is bent to the right as shown in FIG. 4 by the Joule heat, and its tip 13' drives the tips of the adjustment screws 17, 17', and the actuating plate 15 rotates clockwise.

As the operating plate 15 rotates clockwise, the locking end 26 formed on the first link 25 is released from the locking end 16 and released, and the movable plate is released in the closed state in advance. The force and the contact pressure act on the cross bars 33, 33' in the right direction as shown in the fourth figure, and the second link 31 moves to the right as the first link rotates clockwise as the first link opens. direction, the movable plate is rapidly opened, and the interlocking contacts 10, 10' are moved rapidly in the direction of the fixed contacts 5, 10'.
The electric circuit is opened from 5'.

As the second link 31 rapidly moves to the right, the handle 41 is rotated by the clockwise rotational force of the spring 30 and stops at the opening position, completing the opening operation.

Next, in the closed state, if the insulation of the load circuit or load equipment deteriorates and a leakage current of more than a predetermined value flows through the flexible conductor 74 passing through the zero-phase current transformer 48,
The zero-phase current transformer detects the current, and the signal amplified by the earth leakage amplifying section 49 is sent to the lead wire 6 of the electromagnetic tripping device 60.
2, 62' to excite the electromagnetic coil 63.

Based on this excitation, the movable iron core 66 is rapidly attracted to the return spring 64, so that the locking protrusion 65 is attached to the recessed locking end 23 provided at the lower end of the actuating plate 15.
The actuating plate instantly rotates clockwise and activates the opening/closing mechanism in the same way as when overcurrent is applied, opening the circuit and preventing electrical leakage and electric shock. This is to prevent

As described above, the present invention comprises fixed plates 3 and 3', which are provided with fixed contacts 5 and 5' and whose base ends 6 and 6' formed in an L shape are fixed perpendicularly to an insulating base; The movable contacts 10, 10' are provided opposite to
a proximal end portion formed into a shape and a thermal tripping element, 13,1
The movable plates 9, 9' are fixed to the insulating base perpendicularly to the insulating base by overlapping with the L-shaped proximal end portions of the L-shaped proximal ends of the movable plates 9, 9', the hooking ends 16, and the thermal movable plates 9, 9'. An operating plate is provided with ends 18 and 18' driven by a tripping element and pivotally connected to a bearing 19, and a locking end 26 is locked to the locking end, and the other end is pivotally connected to the bearing. a first link 25 which is rotationally biased, a second link 31 on which cross bars 33, 33' for driving the movable plate are mounted, and whose other end is pivotally connected to the first link; A handle 41 having a drive end 42 formed to rotate the link and pivotally connected to the shaft bearing, a resin case housing a zero-phase current transformer 48 and an earth leakage amplifying part 49, and a signal from the earth leakage amplifying part. In response,
Electromagnetic tripping device 60 that drives the lower end of the actuating plate
Since the current leakage switch is equipped with a current leakage switch or disconnector, if the opening/closing mechanism block is placed in a plane parallel to the bottom surface of the current leakage switch or disconnector, as in the conventional structure where the movable plate and the fixed plate face each other, the horizontal direction As a result, the overcurrent tripping device, electromagnetic tripping device, or earth leakage amplifying portion had to be arranged very closely together, making it extremely difficult to arrange them. As in the embodiment of the present invention, the opening/closing mechanism block is configured such that the movable plate and the fixed plate face each other and can be fixed to the bottom in a vertical position, compared to the horizontal position as in the conventional example described above. As a result, overcurrent tripping devices and earth leakage amplifiers can be installed in a way that is extremely smooth and can be fixed with high capacity, and ultra-small earth leakage devices can be used to make very effective use of the space inside the device. The effect of providing peace of mind is truly remarkable.

Furthermore, the electromagnetic tripping device is arranged as an insulating base with an extremely effective and effective space formed in the shape of a square hole at the bottom of the opening/closing mechanism operating block in which the first link and the second link are mounted in the bearing. When the opening/closing mechanism operation block is fixed to the insulating base, the electromagnetic tripping device fitted into the square hole is simultaneously pressed and fixed by the bearing, so that the opening/closing mechanism is fixed. Not only can it be installed and fixed integrally with the mechanism operation block, but also the fixing work can be done extremely easily, efficiently and quickly by simply fitting it into a square hole. is remarkable.

[Brief explanation of the drawing]

1 to 13 of the drawings show an embodiment of the earth leakage and disconnection circuit of the present invention, with FIG. 1 being a front view and FIG. 2 being a side view. FIG. 3 is an internal front view with the cover of FIG. 1 removed. FIG. 4 shows A- which shows the open state of FIG. 1.
A′ cross-sectional view. FIG. 5 is a sectional view taken along line BB' showing the open state of FIG. 1. FIG. 6 is a perspective view of the opening/closing mechanism.
FIG. 7 is an exploded perspective view of the opening/closing mechanism. Figure 8 shows
A perspective view of an electromagnetic tripping device. FIG. 9 is an exploded perspective view of the electromagnetic trip device. FIG. 10 is a perspective view of the earth leakage detection device. FIG. 11 is an exploded perspective view of the earth leakage detection device.
FIG. 12 is a sectional view taken along the line C-C' in FIG. FIG. 13 is an explanatory cross-sectional view of the insulating base taken along the line DD' in FIG. 1... Insulating base, 2... Cover, 3, 3'...
Fixing plate, 4, 4'...Arc guiding protrusion, 5, 5'...
... Fixed contact, 6, 6'... Base end, 7, 7'... Power terminal screw, 8, 8'... Power terminal fitting, 9,
9'...Movable plate, 10,10...Movable contact, 1
1, 11' arc induction protrusion, 12, 12'... base end, 13, 13'... thermal tripping element, 14, 1
4'... Proximal end, 15... Operating plate, 16... Latching end, 17, 17'... Adjustment screw, 18, 18'...
End portion, 19... Bearing, 20... Shaft hole, 21...
Shaft, 22... Spring, 23... Concave notch locking end,
25...first link, 26...locking end, 27...
Shaft hole, 28...Shaft, 29...Shaft hole, 30...Spring, 31...Second link, 32...Vertical center portion, 33, 33'...Cross bar, 34...Vertical oval hole, 34 '...Vertical rim, 35...Horizontal oval hole, 36...Shaft, 37...Other end, 38...Shaft hole,
39...Shaft, 40...Sliding surface, 41...Handle, 42...Drive end, 43...Shaft hole, 44...
Shaft, 45...spring, 46...resin case,
47, 47'... Lead wire, 48... Zero-phase current transformer,
49...Earth leakage amplifying part, 50...Movable test contact piece, 51, 51'...First hooking part, 52...Test purchase circuit adjustment resistor, 53...Second hooking part, 52' ……
Resistor lead wire, 54, 54'...locking protrusion, 55,
55'...Latching protrusion, 56, 56'...Guide wall, 57...Test button, 59...Test button hole, 6
0... Electromagnetic tripping device, 61... Winding frame, 62,
62'... Coil lead wire, 63... Electromagnetic coil,
64... Return spring, 65... Locking protrusion, 66...
Movable iron core, 67...L-shaped electromagnetic frame, 68...Through hole, 69, 69'...Latching wall, 70...Latching protrusion piece, 71...Latching protrusion piece, 72...Latching protrusion piece , 73...Latching protrusion piece, 74, 74'...
Flexible conducting wire, 75...Hollow part, 76, 76'...Load terminal plate, 77, 77'...Load terminal fitting, 78,
78'...Load terminal screw, 79...Shaft hole.

Claims (1)

[Scope of Claims] 1. A fixed plate having a fixed contact and an L-shaped base end fixed vertically to an insulator stand; ● A movable contact facing the fixed plate and having an L-shape. a movable plate which overlaps the formed base end and the L-shaped base end of the thermal tripping element and fixes it perpendicularly to the insulator base and is biased open; and a differential plate having an end driven by the thermal tripping element and pivotally connected to the bearing; A first link that is biased to rotate; A second link that has a crossbar that drives the movable plate pivoted thereon and whose other end is pivotally connected to the first link; ● Rotates the second link. a handle pivotally connected to the shaft bearing; a resin case housing a zero-phase current transformer and an earth leakage amplifying part; An earth leakage or disconnection device characterized by being equipped with an electromagnetic tripping device that drives the lower end of the circuit. 2. The electric leakage and disconnection switch according to claim 1, wherein the free ends of the fixed plate and the movable plate are both provided with arc horns having arc induction protrusions formed thereon. 3. Claim 1, wherein the electromagnetic tripping device is fitted into the center bottom of the insulator stand, and has an actuating plate screwed from the top, which is pressed and fixed by a bearing of a shaft. Electrical leakage or disconnection as described in section.