JPS6111878Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an earth leakage or disconnection device that interrupts a circuit when an earth leakage accident occurs in the circuit.

Generally, an earth leakage or disconnection circuit consists of a switching mechanism that opens and closes the circuit, a zero-phase current transformer that detects leakage current, and an electromagnet that either amplifies the secondary output of this current transformer or sends it as is. The electromagnetic device is connected to the opening/closing mechanism.

By the way, regarding the positional relationship of each of these parts, conventional earth leakage and disconnection devices have the following two arrangements. One of them is a vertical arrangement, in which the opening/closing mechanism is placed at the top, the current transformer and the amplifier are placed at the bottom, and the electromagnetic device is placed near one of them, resulting in a vertically elongated shape. Another arrangement is to divide the shield breaker into left and right sections approximately in the center, position the opening/closing mechanism in one zone, and locate the leakage detection section consisting of a zero-phase current transformer in the other zone.
The shape is approximately square or oblong, and in either case, the external dimensions are larger than an overcurrent switch of the same capacity.

Now, this earth leakage switch and disconnector are housed in the distribution board along with the overcurrent switch and disconnector, but the distribution board is generally built based on the dimensions of the overcurrent switch and disconnector.
If the current leakage or disconnection switch becomes longer than the overcurrent or overcurrent switch, the storage size becomes unreasonable, so the vertical dimension of the distribution board must be increased. Furthermore, even if the overcurrent is laterally longer than the breaker, the size of the distribution board must be increased accordingly, which is not economically preferable. Furthermore, when installing an earth leakage or disconnector on an existing distribution board, install it in the spare circuit space of the overcurrent or disconnector, or install the earth leakage or disconnector at the location where the overcurrent or disconnector was removed. Normally, it is installed, but in this case, it is impossible to add or replace it unless it matches the dimensions of the overcurrent switch or disconnector.

The present invention was developed in view of the above points, and the main frame for mounting the main parts of the opening/closing mechanism is fixed to the outer bottom surface of the resin box that accommodates the amplified width of the current leakage and disconnection. The amplifier is stored in the storage box, and the main parts such as the cross bar, movable contact, hook plate, trip plate, link, handle, etc. are attached to the main frame, and these are stored. By fixing the fixed box to the base, the internal structure of the overcurrent circuit breaker can be configured to have the same external dimensions as the overcurrent circuit breaker, especially the safety breaker used in residential distribution boards. , both existing and new distribution boards are lined up with the same dimensions as the safety breakers,
It can be easily installed when expanding or replacing a safety breaker, and the size of the distribution board can be made very small.It also improves the insulation performance of the circuit breaker, making it economical in terms of performance. The purpose is to obtain an earth leakage and disconnection switch with excellent characteristics.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

Reference numeral 1 denotes an earth leakage disconnector main body, which is composed of a device stand 2 and a cover 3 covering it, both of which are made of synthetic resin. Reference numeral 4 denotes an input terminal device mounted on one end of the device base 2, which is composed of a box-shaped terminal fitting 6 provided with a tightening screw 5, and an input terminal plate 7 inserted into the fitting 6. A fixed contact 8 is provided at one end. Reference numeral 9 denotes an output terminal device installed at the other end of the device stand 2, and is composed of a box-shaped terminal fitting 6 provided with a tightening screw 5 and a terminal plate 10 inserted into the fitting 6.

Reference numeral 11 denotes an L-shaped movable contact plate, with a movable contact 12 provided approximately in the center of the L-shape, one end of which is integrally molded or fixed by caulking to a cross bar 13 made of an insulator that connects the left and right poles, and the other end is braided. Connect lines 14a and 14b, respectively.

The braided wires 14a and 14b go down to the bottom and are connected to the output terminal, but in the case of two poles and one element, on the side with the overcurrent tripping element, the braided wire 1
4a is a bimetal 15 that displaces in response to overcurrent.
Further, a braided wire 16 is connected to the upper part of the bimetal 15, and the braided wire 16 passes through a zero-phase current transformer (described later) for dealing with electric leakage and is connected to the terminal plate 10 on the output side.

On the other hand, on the side without the overcurrent tripping element, the braided wire 14b directly passes through the zero-phase current transformer (described later),
It is connected to the terminal board 10.

17 is an insulating coating of the braided wire 14b, and 18 is an insulating coating of 16 as well.

Reference numeral 19 denotes a metal fitting for fixing the bimetal 15, to which the bimetal 15 is fixed to one end and fixed to the instrument stand 2 with a tightening screw 20.

In the case of two poles and two elements, the bimetal 15 is provided on both the left and right poles and connected as described above. Furthermore,
For ground fault protection only, use bimetal 1 for both left and right poles.
Remove 5 and connect as described above.

Reference numeral 21 denotes a main frame, which includes guide portions 25, 26 and a widening device 27 that restrict movement only in the vertical direction of the cross bar 13 that connects the operating handle 22 and the supporting frame 24 of the operating plate 23 and the movable contact of different polarity. It is provided with engaging portions 29 and 30 that engage with the box 28 to be stored.

Describing the configuration of the main frame 21, the support frame 2
The guide parts 25 and 26 are located at the fixed and movable contact parts along with the supporting frame. The box 28 that houses the amplifier 27 has an opening on the lower surface, grooves 31 and 32 for engaging with the engaging parts 29 and 30, and a T-shaped protrusion 33 at the bottom of the groove 31. A plurality of convex portions 34 are provided on both sides, that is, the surfaces in contact with the left and right side walls of the table 2, and the main frame 21
To attach the box 28 to the container stand 2, insert the T-shaped protrusion 33 at the tip and the protrusions 34 provided on both sides into the T-shaped hole 2a and the groove 2b of the cover 3. The T-shaped protrusion 33 and the protrusion 34 are pressed and fixed on the joint surface with the base 2.

The operating handle 22 is fixed at its center to the support frame 24 by a shaft 35, with one end serving as a handle 22a protruding from the window hole 3a of the cover 3, and the other end serving as a cam portion 22b.

36 is a return spring for the handle 22, which is supported by the shaft 35.

Thus, the supporting frame 24 is located between the two poles in the case of the bipolar type of the embodiment, and is located directly above the central pole in the case of the three pole type.

24a is a U-shaped link having spring properties, and the cutout grooves 37 provided on both side plates of the supporting frame 24 are inserted into the cam portion 22b of the handle 22 at one end 37a;
Moreover, the other end 37b is inserted into the notch groove 24a.
Therefore, when the handle 22 is reversed, the cam portion 22b is reversed left and right with respect to the shaft 35, and the other end 37b moves up and down in the notched groove 24a.

One end 36a of the return spring 36 of the handle 22 is hooked on one end 37a of the U-shaped link 37, and the other end 36b is hooked on the support frame 24, so that the link 37
and the handle 22 are always operated in the opening direction.

An arm 38 is located between both side plates of the support frame 24, and its center is pivotally supported by the other end 37b of the U-shaped link 37.

Therefore, the arm 38 accompanies the movement of the other end 37b of the link 37.

By operating the handle 22, one end 38a of the arm 38 moves the cross bar 13 connecting the different polarity movable contacts in the vertical direction while sliding it at the positions of the guide parts 25 and 26, and when the handle is in the closed position, the fixed contact is moved. 8 and the movable contact 12 are brought into a closed state.

39 is a cam portion 2 through which one end 37a of the link 37 passes.
The hole 2b and 40 are holes in the arm 38.

The actuation plate 23 is made of synthetic resin, has a shaft 23a pivoted in grooves 24c on both side plates of the support frame 24, has one end 23b of the upper part facing the bimetal 15, and has the other end 23c connected to the movable iron piece 41. is firmly attached. This 41 corresponds to the leakage operation described later.

A screw 42 is threaded onto one end 23b of the actuating plate 23 to adjust the distance between the actuating plate 23 and the upper part 15a of the bimetal 15, thereby changing the operating characteristics of the shear breaker. 43 is a screw hole, 44 is an engaging portion located approximately in the center of the actuating plate 23, and the other end 38b of the arm 38 is connected to the handle 22.
It is located on the side and is engaged by reversing the handle 22.

Reference numeral 45 denotes an arm portion having a spring property that always presses the actuating plate 23 in the direction of the support frame 24, that is, toward the arm 38. The arm portion 45 is formed integrally with the actuating plate 23, and is provided with a hook 46 at the lower end. is support frame 24
The spring of the arm part 45 is used to lock the arm part 45 to a locking stepped part 24b provided at the lower part of the arm part 45.

A return spring 47 of the movable contact plate 11 is fitted into the receiving recess 13a of the cross bar 13 and the receiving recess 48 provided in the main frame 21.

The contacts 8 and 12, the contact plate 11, the handle 22, the ring 37, the arm 38, the operating plate 23, etc. constitute an opening/closing mechanism for leakage and disconnection.

Next, we will explain the configuration that deals with earth leakage.
Reference numeral 49 denotes an endless annular zero-phase current transformer for detecting zero-phase current, which is located approximately in the center between the two poles on the output terminal device 9 side, and the braided wire 14 is inserted into the hole 50 as a detection wire.
b and 16 pass through.

When the braided wires 14b and 16 become unbalanced due to a current leakage, a secondary output is induced on the secondary side when the detection wires 14b and 16 are made primary.

Reference numeral 27 denotes an amplifier for amplifying the secondary output, which is housed in a box 28 and covered with a filler such as resin, such as epoxy.

Reference numeral 51 denotes an electromagnet device, which faces the movable iron piece 41 described above.

Next, we will explain the operation of the current leakage and disconnection circuit.
FIG. 4 shows an open state, in which the contacts 8 and 12 are separated.

Further, the arm 38 is located on the handle 22 side along with the link 37.

When closing from the above state, the handle 22a of the handle 22 is reversed counterclockwise as shown in FIG.

In conjunction with this, the cam portion 22b of the handle is reversed counterclockwise, and the other end 37b, along with the link 37, moves in the notch groove 24a of the support frame 24.

One end 38a of the arm 38, which is pivotally attached to the other end 37b, attempts to follow the direction of the contact plate 11, but the other end 38b engages with the engaging portion 44 of the actuating plate 23, so that the arm 38 The subsequent movement is only at one end 38a, and at this end 38a, the cross bar 13 is pushed toward the instrument stand 2, and the contact plate 11 is also moved in the same way. This movement of the contact plate 11 brings the contacts 8 and 12 into contact, and this state is maintained by holding one end 37a of the link 37 at a position beyond the handle shaft 35. Of course, when opening the pole, flip the handle 22a of the handle 22 clockwise as shown in FIG.
One end 37a is moved to a position beyond the handle shaft 35, the arm 38 is moved, and the contact plate 11 is moved by the spring 47.
The contacts 8 and 12 are opened.

Next, in the closed state shown in FIG. 5, when a current leakage occurs, the detection lines 14b and 16 become unbalanced, and the zero-phase current transformer 49 detects this unbalance. Therefore, the secondary output is connected to the electromagnet device 51 via the amplifier 27.
is driven, the movable iron piece 41 is attracted, and at this time one end of the actuating plate 23 is moved.

As a result, the actuating plate 23 is reversed clockwise from the state shown in FIG. Then, the one end 38a moves toward the handle 22, releases the pressure on the crossbar 13, and closes the contact plate 11.
is returned by the spring 47 and opened.

Also, in case of overcurrent, bimetal 1
5 is displaced to the right in FIG.
8 moves and contacts 8 and 12 are opened.

Since the present invention is configured as described above, the following excellent effects can be obtained. That is, compared to the conventional method of screwing the support frame to the base, there is no need to pay attention to twisting of the base and support frame when screwing, improving work efficiency and improving the precision of the assembled product.

Since the box part in which the amplifier is housed is completely covered by the bottom of the base, the amplifier can be completely protected.

Boxes that house the base and amplifier, or boxes that house the amplifier, and support frames, etc., have been integrated into one unit, and these are known as amplifier assembly and mechanism assembly. Do you have to perform completely different work for each part?In this application, it is sufficient to simply combine the main frame incorporating the mechanical parts and the box incorporating the amplifier at the end of each work. Good sex.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is a side view, Fig. 3 is a bottom view, and Fig. 4 is a cross section taken along line AA in Fig. 1, showing the open state. show. Fifth
The figure is a cross section taken along line B-B in FIG. 1, and shows a closed state. FIG. 6 is a perspective view showing the relationship among the main frame, box, and base; FIG. 7 is a perspective view showing the relationship among the main frame, box, and amplifier; FIG. 8 is an exploded perspective view of the opening/closing mechanism. 1...Earth leakage and disconnection main body, 21...Main frame, 24
... Support frame, 27 ... Multiplier, 28 ... Box,
29, 30... Engaging portion, 31, 32... Groove, 49
...Zero-phase current transformer, 51...Electromagnetic device.

Claims (1)

[Claims for Utility Model Registration] A movable contact that is made to face the fixed contact 8 by raising and lowering the cross bar 13, which is biased in the opening direction by the return spring 47, using the handle 22, the U-shaped link 37, and the arm 38. 12 to turn the circuit on and off, and in the event of a current leak, apply voltage to the electromagnetic device 51 to attract the movable iron piece 41, disengage the arm from the actuating plate 23, and disconnect the circuit. A supporting frame 24 having a hole at the upper end for locking the handle, and guide parts 25 and 26 for restricting movement of the cross bar only in the vertical direction are arranged side by side, and engagement parts 29 and 30 are provided at the front and rear. a main frame 21, and a groove 3 having an opening on the lower surface and engaging with the engaging portion.
1, 32, and a T-shaped protrusion 33 at the bottom of the front groove 31,
Box 28 with a plurality of protrusions 34 on both sides
and a T-shaped hole 2 into which the T-shaped protrusion is inserted inside the front part.
a, an instrument base 2 provided with a plurality of grooves 2b into which the convex portions are inserted on the inside of both sides, an adjustment screw mounting portion 23b facing the overcurrent detection bimetal 15 at one end of the upper side, and the electromagnet at the other end. It is provided with a mounting part 23c of the movable iron piece 41 facing the device, an engaging part 44 of the arm in the center part, and a shaft part 23a pivotally supported on the support frame in the lower part,
An earth leakage and disconnection device characterized in that it is constituted by an actuating plate 23 integrally formed with an arm portion 45 having spring properties and having a hook 46 at the lower end that engages with a support frame on the back side.