KR20040080917A - Circuit Breaker - Google Patents

Abstract

PURPOSE: A circuit breaker is provided to ensure unity of frame sizes of the circuit breaker and earth leakage breaker, and achieve improved arc extinguishing performance. CONSTITUTION: A power side terminal(2) and a load side terminal(3) are disposed at both ends of a mold case(1). An arc extinguishing device(9), a switch(6), and an over current trip device(10) are assembled in sequence from a power source side in the case. A connection conductor(3a) extracted from the load side terminal into the case, is connected to the over current trip device through a preliminary space(12) between the load side terminal and the over current trip device. The mold case has outer sizes(A,B) which are unified with the size of the mold case of an earth leakage breaker. An inner size(C1) of the connection conductor extending toward the inside of the case from the load side terminal, is shorter than the connection conductor of the load side terminal applied to the earth leakage breaker. The attachment positions of the over current trip device and the switch are moved to the place near the load side terminal, to thereby expand the space occupied by the arc extinguishing device.

Description

Circuit Breaker {Circuit Breaker}

The present invention relates to a circuit breaker (auto breaker) applied as a component of overcurrent protection for a load installation of a low voltage distribution system.

(Conventional technology)

As the protection device of the low voltage distribution system, the above-mentioned circuit breakers and earth leakage breakers are widely used. Regarding this circuit breaker and earth leakage breaker, in the conventional products, the main circuit contactor, the switching mechanism, and the overcurrent trip device which generally unify the appearance of the same frame (ampere frame) in the same size and are assembled in the breaker case (molded case). Various parts, such as these, are made common, and the cost of manufacturing cost is reduced, and the service improvement for the construction of the protection system at the demand side is aimed at (for example, refer patent document 1).

Next, the assembling structure is shown in FIG. 6, FIG. 7, and FIG. 8, taking the wiring breaker and the earth leakage breaker disclosed in patent document 1 as an example. In each figure, reference numeral 1 denotes a resin mold case made of a base 1a and a cover 1b, and reference numeral 2 denotes a power supply side terminal (plate terminal) disposed on one end face (left side of the drawing) of the mold case 1. , 3 is a load terminal (plate terminal) disposed at the other end face (right side of the drawing), 3a is a connecting conductor drawn integrally with the load side terminal 3 and drawn out inside the mold case 1, 4 Is a repulsive fixed contact with an e-shaped bent end integrated with the power supply terminal (2), 4a is a fixed contact, 4b is an arc horn, 5 is a movable contact, 5a is a movable contact, 6 Is a toggle link type opening and closing mechanism assembled in the center of the mold case in association with the movable contactor 5, 7 is a screw that fixes the assembly of the opening and closing mechanism 6 to the case 1a, and 8 is an opening and closing mechanism 6 Locker type to turn on / off the movable contactor (5) by external operation. 8a denotes a handle portion of the handle 8 protruding from the cover 1a of the mold case 1, and 9 denotes a left side (power supply side) of the opening / closing mechanism 6 and assembled to the mold case 1. A de-armoring device (Di-iron grid type arc-extinguishing chamber composed of a plurality of sub-armor plates), 10 denotes a combination of a thermal (bimetal) and an electronic (solenoid), and overcurrent disposed on the right side (load side) of the opening / closing mechanism 6. The trip device, reference numeral 11 denotes a screw for fixing the assembly of the overcurrent trip device 10 to the bottom of the mold case 1, reference numeral 12 denotes the load-side terminal 3 and the load-side terminal 3 in the mold case in advance in order to assemble the leakage detection device described later. It is a spare space secured between the overcurrent trip devices 10.

Here, in the circuit breaker and the earth leakage circuit breaker of the same frame, the mold case 1 is made of the same external dimensions (length A, height B), and the power-side terminal (assembled in the case including the mold case 1) ( 2) A wiring breaker and an earth leakage circuit breaker are constructed using various components such as the load side terminal 3, the opening / closing mechanism 6, the handle 8, the arc extinguishing device 9 and the overcurrent trip device 10 as common components. have. In addition, in FIG. 6, the code | symbol C1 has shown the inner dimension of the connection conductor 3a wound around the said preliminary space 12, and the code | symbol D1 has shown the dimension of the space which the extinguishing device 9 occupies.

In addition, the connecting conductor 3a of each phase (R, S, T phase) extending from the load-side terminal 3 to the inside of the case is bent in a shape as shown in FIG. 8 in advance, and in the circuit breaker of FIG. The connection conductor 3a or the connection conductor which consists of a flat conductor in which each phase was bent in the same shape is connected to the overcurrent trip device 10 (heater type bimetal heater conductor 10a in the figure) via the said preliminary space 12. It is (soldered). On the other hand, in the earth leakage breaker shown in FIG. 7, the earth leakage detection apparatus 13 was assembled in the above-mentioned spare space 12, and as shown in FIG. 8, the connection conductor 3a drawn out from the load side terminal 3 is shown. Is wound around the video current transformer 13a as a primary conductor, and the tip thereof is connected to a bimetal heating heater conductor of the overcurrent trip device 10.

The protection operation of the circuit breaker and earth leakage circuit breaker having the above-described configuration is well known. The main circuit current is supplied from the power supply side terminal 2 to the fixed contact 4, the movable contact 5, the overcurrent trip device and the connection conductor 3a. It flows to the load side terminal 3 via. Here, when an overload current or a short-circuit current flows in the main circuit, the overcurrent trip device 10 operates from time to moment and releases the latch mechanism of the open / close mechanism 6, whereby the open / close mechanism 6 trips and the movable contactor. (5) is open from the fixed contact (4). At this time, the arc generated between the fixed contact 4a and the movable contact 5a is driven by the magnetic force of the electric current and attracted to the inside of the arc extinguishing device 9, where it is divided by an arc extinguishing plate (magnetic plate called a grid). It is extinguished by the positive and negative drop and cooling action.

On the other hand, in the ground fault circuit breaker, in addition to the overcurrent protection function described above, the ground fault detection device 13 detects the video current flowing through the main circuit with the occurrence of a ground fault in the converter, and trips the opening and closing mechanism at its output. The contact 5 is opened to cut off the current. In addition to the above-described protection operation, by moving the handle 8a of the handle 8 to the ON and OFF positions, the toggle link mechanism of the opening / closing mechanism 6 is reversed in conjunction with the movement of the handle 8. The movable contact 5 opens and closes.

[Patent Document 1] Japanese Patent No. 3246562

However, in general, the current accompanying the overcurrent and short circuit of the converter is much larger than that of the ground fault, and as a demand of the market, higher breaking performance is required for the products of the wiring breakers than the earth leakage breakers of the same frame.

In order to cope with such a demand, it is necessary to employ a large-scale arcing chamber in the arc-extinguishing device 9 incorporated in the wiring breaker shown in FIG.

In this case, the large-scale arc extinguishing apparatus 9 is not changed, without changing the layout of the opening / closing mechanism 6 assembled in the mold case 1 of the conventional product, the overcurrent trip device 10, and the spare space 12. In order to increase the breaking performance by mounting a), it is necessary to extend the mold case 1 to the power supply side in accordance with the expansion of the space of the extinguishing device 9.

However, if the mold case is made large in size due to the necessity of increasing its breaking capability with respect to the wiring breaker, the compactness of the circuit breaker is impaired, and the unit size of the frame breaker of the wiring breaker and the earth leakage breaker is destroyed in terms of the product. Therefore, in the circuit breaker for wiring, the present state is made to leave the spare space which is substantially unnecessary space.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described points, and the unity of the frame size of the circuit breaker and the earth leakage breaker is reviewed by reviewing the conventional assembly structure of the circuit breaker and appropriately adjusting the layout of the main components assembled in the mold case. It is an object of the present invention to provide a circuit breaker for high interruption with high breaking performance in a compact configuration while ensuring a high performance.

In order to achieve the above object, according to the present invention, a power supply side terminal and a load side terminal which are connected to a fixed contactor are arranged at both ends of a mold case, and in the casing are arranged in an arcing area of the main circuit contactor from the power supply side in turn. After assembling an arc extinguishing device, an opening / closing mechanism of a movable contactor, and an overcurrent trip device, the connecting conductor drawn out from the load side terminal into the case is connected to the overcurrent trip device through a preliminary space between the load side terminal and the overcurrent trip device. In circuit breaker,

The outer dimensions of the molded case are unified to the same dimensions as the conventional products of the earth leakage breaker of the same frame, and then the inner dimensions of the connection conductors extending from the load-side terminals to the inside of the case are shorter than the connection conductors of the earth leakage breaker. The attachment position of the overcurrent trip device and the switching mechanism is moved to be positioned near the load-side terminal relative to the layout of the earth leakage breaker, and the space occupied by the extinguishing device in the case is expanded (claim 1).

Thereby, the molded case of the wiring breaker can be unified to the same frame size as the earth leakage breaker of the conventional product, and then a large extinguishing device can be assembled in the case to increase the breaking performance.

In addition, about the structure of each part in the above, it can implement in the specific form like the following description by this invention.

(1) An arc extinguishing device is constructed by combining a deiron grid type arc extinguishing chamber common to the arc extinguishing device of the earth leakage breaker and a magnetic body placed side by side in the opening and closing path of the movable contactor. In order to make the parts common to each other, the space occupied by the arc extinguishing device is effectively utilized, and the arc extinguishing plate and the magnetic material are added thereto to increase the extinguishing capacity of the arc extinguishing device (claim 2).

(2) The connecting conductor of the load-side terminal is bent to form an L-shape from the terminal, and the overload tripping device and the opening / closing mechanism are moved to the vicinity of the load-side terminal and connected to the connecting conductor relatively in accordance with the position of the connecting conductor, thereby limiting the external dimensions. Maximize the occupied space of the extinguishing device in the mold case. (Claim 3).

(3) In addition, when an external operation handle (handle for manually opening / closing a circuit breaker installed inside a panel such as a switchboard) from the outside of the wiring circuit breaker is assembled to the switchboard or the like, an earth leakage circuit breaker of the same frame is used. The handle of the locker handle equipped with the circuit breaker for the circuit breaker and the earth leakage breaker of the same frame so that the handle of the control panel (locker handle) linked to the opening / closing mechanism can be shared. It is formed in a position where the ON and OFF positions are roughly coincident with the negative portion, and when the external operation handle is used in combination, the opening and closing operation of the circuit breaker can be performed without interruption (claim 4).

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional side view showing the assembling structure of a circuit breaker according to Embodiment 1 of the present invention.

2 is an enlarged cross-sectional view of the extinguishing device and its peripheral portion of FIG. 1;

Fig. 3 is a sectional view of an arc extinguishing device and its peripheral portion corresponding to Embodiment 2 of the present invention;

Fig. 4 is a side view of the cross section of the main portion, showing the assembly structure of the circuit breaker according to the third embodiment of the present invention.

Fig. 5 is a side view showing a state in which an external operation handle is combined with a wiring breaker according to Embodiment 4 of the present invention.

Figure 6 is a side cross-sectional view showing an assembly structure of a conventional circuit breaker.

FIG. 7 is a side view of an essential part cross section showing an assembling structure of a circuit breaker of FIG. 6 and an earth leakage breaker of the same frame size. FIG.

FIG. 8 is a perspective view showing the electrical leak detecting apparatus of FIG. 7 and a wiring structure around the circuit.

9 is a side view showing a state in which the external operation handle is combined with the breaker of FIGS. 6 and 7;

(Explanation of symbols for the main parts of the drawing)

1 Mold Case 2 Power Terminal

3: load side terminal 3a: connection conductor

4: fixed contact 5: movable contact

6: opening and closing mechanism 8: rocker handle

8a: handle portion 9: arc extinguishing device

9a: SOHO 9b: magnetic material

10: overcurrent trip device 12: spare space

14: external operation handle

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on the Example shown to FIGS. In addition, the same code | symbol is attached | subjected to the same member corresponding to FIGS. 5 and 6 in the figure of each Example, The description is abbreviate | omitted.

(Example 1)

First, Fig. 1 shows an assembling structure of a circuit breaker according to the embodiment of the present invention. In the present embodiment, the dimensions (length: A, height: B) of the mold case 1 are basically the same as those of the circuit breaker shown in Figs. Although the same dimensions as those of the mold case 1 employed in the circuit breaker and the ground fault circuit breaker (a conventional product), the layout of the various components assembled to the mold case 1 is set as described in the following description. have.

That is, in the configuration of FIG. 1, the inner dimension C2 of the connecting conductor 3a that extends from the load side terminal 3 toward the inside of the case is shorter than the inner dimension C1 of the connecting conductor in FIGS. 6 and 7 ( C2 <C1), and then move the attachment position of the opening / closing mechanism 6, the handle 8 and the overcurrent trip device 10 to a position closer to the load side terminal 3 than the attachment positions of Figs. It is fixed to (1) with screws 7 and 11. In addition, the dimensions of the power supply side terminal 2 and the fixed contactor 4 integrally change slightly longer in accordance with the new moving position of the opening / closing mechanism 6, and the contact 5a of the fixed contact 4a and the movable contactor 5 is changed. ) Are facing each other. In addition, in the illustrated embodiment, as the positioning fixing means of the opening / closing mechanism 6 and the overcurrent trip device 10, the screws 7 and 11 are fixed to the bottom of the base 1a of the mold case 1. However, the present invention is not limited thereto, and may be fixed by screwing the cover 1b of the mold case 1, for example.

According to the above-described layout, the occupied space D2 of the extinguishing device (dian-grid type arc-extinguishing chamber) 9 arranged on the left side (power supply side) of the opening / closing mechanism 6 and assembled to the mold case 1 is shown in FIG. 6. 7 is enlarged (D2> D1) in the long side direction of the case than the occupation space D1 of the arc extinguishing device in FIG. And in accordance with the expansion of this occupation space, in the wiring breaker of FIG. 1, as the arc extinguishing device 9, as shown in FIG. 2, the dimension of the extinguishing board (grid) 9a was expanded according to the occupancy space D2. It is equipped with a large-scale arc room, and it aims at the enhancement of arc-light ability.

That is, in the conventional circuit breaker (FIG. 6), the load side terminal 3 and the overcurrent trip device 10 are formed inside the mold case 1 in order to unify the frame size of the earth leakage breaker and to share components. In the embodiment of FIG. 1, the opening / closing mechanism 6 and the overcurrent trip device 10 are reduced in order to reduce the preliminary space 12 while the preliminary space 12 for assembling the ground fault detecting device 13 is secured therebetween. ), The occupied space of the extinguishing device 9 is enlarged by moving near the load-side terminal, whereby the extinguishing ability of the breaker can be increased without destroying the unity of the frame size with the ground fault breaker.

Next, the application example of this invention based on the structure of FIG. 1 is demonstrated with FIG. 3, FIG. 4, FIG.

(Example 2)

3 shows an embodiment of an arc extinguishing device corresponding to claim 2 of the present invention. In this embodiment, in accordance with the expansion of the space occupied by the arc extinguishing device in the mold case 1 described in Example 1 described above, the arc extinguishing device 9 to be assembled in the case is connected to the circuit breaker of Figs. 6 and 7. The deironing apparatus of common type and the iron-iron type | mold arc extinguishing system and the magnetic body 9b arrange | positioned at both the left and right sides of the opening-and-closing path of the movable contactor 5 in addition to this arc extinguishing chamber are comprised, and the magnetic body 9b is comprised. The magnetic drive iron core is used to increase the magnetic drive effect of driving the arc generated between the fixed and movable contacts toward the arc extinguishing chamber. Moreover, the arc-extinguishing apparatus which adds the magnetic body 9b to the arc-extinguishing chamber, and raises the magnetic drive effect of an arc is known, for example in Unexamined-Japanese-Patent No. 7-296707.

As mentioned above, by using together the arc-breaking apparatus which added the magnetic substance to the diiron-grid type arcing chamber to the wiring circuit breaker of Example 1 mentioned above, the arc-extinguishing apparatus applied to the earth leakage circuit breaker of a conventional product, and the part of the arc-extinguishing apparatus are used, The circuit breaker for wiring with high breaking performance can be obtained further by strengthening the extinguishing ability of the apparatus 9.

(Example 3)

Fig. 4 shows an embodiment corresponding to the third aspect of the present invention. The opening and closing mechanism is moved to the load side so as to eliminate the preliminary space in the mold case based on the configuration of the first embodiment described above. The occupied space of the arc extinguishing device 9 to be assembled to the unified mold case 1 is further enlarged to further enhance the arc extinguishing ability.

Therefore, in this embodiment, the base of the connecting conductor 3a drawn out from the load side terminal 3 to the inside of the case is bent from the load side terminal 3 in an L shape to stand upward in a straight line, and the inner dimension thereof is connected. Reduce to dimensions C3 (C3 <C2) corresponding to the plate thickness of the conductor. Further, in accordance with this, the opening and closing mechanism 6 and the overcurrent trip device 10 are positioned close to the right end (load side) in the case as much as possible, and the positioning is fixed. Then, the tip of the connecting conductor 3a and the bimetal heating of the overcurrent trip device 10 are carried out. The electric heater conductors 10a are connected to each other (soldered).

By this structure, the space occupied by the extinguishing device 9 to be assembled in the case is enlarged as much as possible with respect to the mold case 1 whose external size is defined by the unitary dimensions A and B, thereby enhancing the extinguishing capacity. .

(Example 4)

Next, an embodiment in which the rocker-type handle 8 equipped with the wiring breaker is improved in consideration of the case of using the external operation handle in combination with the wiring breaker described in each of the above embodiments is shown in FIGS. 5 and FIG. The explanation is based on 9.

Fig. 9 shows a use state in which the external operation handle 14 (external accessory of the circuit breaker) is assembled to the circuit breaker of the conventional products shown in Figs. In addition, the structure of an external operation handle used here, and opening / closing operation are described in detail in Unexamined-Japanese-Patent No. 9-27262, for example.

That is, in Fig. 9, the external operation handle 14 is a two-pronged type that moves in a linear direction following the rotation operation of the body (housing) 14a, the rotary handle 14b, and the handle 14b. When the body 14a is attached to the cover upper surface of the mold case 1 of the wiring breaker, the drive arm 14c is held by the handle portion of the handle 8 on the breaker side. 8a). In this state of attachment, when the knob 14b of the external operation handle 14 is turned to the ON and OFF positions from the front of the switchboard 15, the driving arm 14c linearly moves in the ON and OFF directions indicated by the arrows. The rocker type handle 8 of the circuit breaker is driven to operate.

In this external operation handle 14, the drive arm 14c is positioned so as to be fitted in accordance with the ON and OFF operation positions of the handle portion 8a of the rocker-type handle 8 protruding from the mold case 1 of the circuit breaker. It is decided.

Therefore, when the opening / closing mechanism 6 is moved and positioned near the load side terminal 3 with respect to the mold case 1 as described in each of the above-described embodiments, the handle connected to the opening / closing mechanism 6 is natural. The position of (8) also changes. Referring to this situation in FIG. 9, the handle 8 located at point P in the circuit breakers of FIGS. 6 and 7 has a load side by ΔL with the opening / closing mechanism accompanied by the new positioning (see FIGS. 1 and 4). It is moved to the vicinity (right side of the drawing) and is located at the point Q shown by the broken line.

As a result, even if the external operation handle 14 prepared as an accessory used by the circuit breaker of a conventional product is intended to be attached to the mold case 1 of the circuit breaker of FIG. 1 or 4 as it is, a rocker-type handle Since the position of the handle 8a of (8) changes, the drive arm 14c does not engage the handle part 8a of the rocker-type handle 8, and it cannot apply as it is.

Thus, in the present embodiment, as an operating handle of the circuit breaker, a dedicated rocker handle corresponding to the wiring breaker of Fig. 1 or 4 is prepared so that the external operation handle 14, which is an accessory of the conventional product, can be shared. Doing. Therefore, in the embodiment shown in FIG. 5, the position of the grip part 8a formed in the rocker-type handle 8 is changed, and the rocker-type handle equipped with the said circuit breaker and the earth leakage breaker of the same frame. It forms so that ON and OFF operation position may correspond with the handle part of (refer FIG. 9) roughly. Thereby, the external operation handle 14 prepared as an accessory of a conventional product can be shared and used for the wiring breaker of FIG.

As described above, according to the present invention, the extinguishing device and movable contact mechanism of the movable contactor are arranged at both ends of the mold case, and the power supply terminal and the load side terminal of the integral structure are arranged, and the case is combined with the contactor from the power supply side in turn. And a circuit breaker for assembling the overcurrent trip device, and then connecting the connection conductor drawn out from the load side terminal to the inside of the case through the preliminary space between the load side terminal and the overcurrent trip device to the overcurrent trip device. The dimensions are the same as those of the molded case of the circuit breaker of the same frame as the molded case of the earth leakage breaker of the same frame, and then the inner dimension of the connection conductor extending from the load side terminal to the inside of the case is shorter than the connection conductor of the load side terminal applied to the earth leakage breaker. According to this overcurrent trip length And by expanding the space occupied by the extinguishing device by moving the attachment position of the opening / closing mechanism near the load-side terminal, the outer dimensions are defined while ensuring the uniformity of the frame size and the commonization of the main parts, as in the case of the conventional circuit breakers and earth leakage breakers. The occupied space of the arc extinguishing device assembled to the molded mold case can be expanded, and it can provide the circuit breaker with high breaking performance which can fully satisfy the market demand.

Claims (4)

On both ends of the molded case, a power supply terminal and a load terminal which are connected to the fixed contactor are arranged, and inside the case, an assembling device which is combined with the contactor in turn from the power supply side, an opening and closing mechanism of the movable contactor, and an overcurrent trip device are assembled. In the wiring breaker which connected the connection conductor which led out from the load side terminal to the case inside, through the preliminary space between a load side terminal and an overcurrent trip device, In the state where the external dimensions of the molded case are unified to the same dimensions as the molded case of the earth leakage breaker of the same frame as that of the wiring breaker, the inner side of the load side terminal applying the inner dimension of the connection conductor extending from the load side terminal to the inside of the case. The circuit breaker for shortening than the connection conductor and extending the space occupied by the extinguishing device by moving the attachment position of the overcurrent trip device and the switching mechanism near the load side terminal in accordance with this. The method of claim 1, A circuit breaker comprising: a deironing grid-type arcing chamber common to the arcing circuit breaker of a ground fault circuit breaker; and a magnetic body placed side by side in the opening and closing path of the movable contactor. The method of claim 1, A circuit breaker for connecting a load-side terminal by bending an L-shaped connection conductor from the terminal and connecting an overload trip device to the tip of the connection conductor. The method of claim 1, The on / off position is roughly consistent with the handle of the locker handle equipped with the handle for opening / closing operation linked to the opening / closing mechanism, and the handle portion of the handle is equipped with a circuit breaker for the wiring and an earth leakage breaker of the same frame. A circuit breaker, characterized in that formed in the position.