KR20130031790A - Circuit breaker - Google Patents

Abstract

PURPOSE: A circuit breaker is provided to arrange a component in the opposite side of a fixed contact point by inserting a SOHO, thereby improve the degree of freedom of the arrangement of the component. CONSTITUTION: The housing(4) receives and preserves two fixed contact points. The two moving points(21, 22) are able to disjunt on a one-to-one basis with the fixed contact point, and are electrically connected with each other. A trip device detects an anomalous and takes each of the moving point apart from each of the fixed contact point. A porous(42) is in the housing so that it communicates the inside and the outside of the housing near one of the fixed contact point. When a SOHO(8) is heated, it is made of the material generating the gas. The SOHO is inside the housing so that it is arranged in the opposite side of the porous, inserting the other side of the fixed contact point.

Description

Circuit breaker {CIRCUIT BREAKER}

The present invention relates to a circuit breaker.

Conventionally, as a circuit breaker which detects abnormality, such as an overcurrent, and cuts off a circuit, it is provided to simultaneously open and close two sets of contacts connected in series with each other.

Conventionally, in this type of circuit breaker, in the housing which accommodated the said two sets of contacts, the ventilation hole was provided in the wall of both sides in the direction where two sets of contacts line up, respectively (for example, refer patent document 1). .

Japanese Patent Publication No. 2007-242463

Since the ventilation hole is provided for discharging the gas generated at the time of opening of the contact or the like, a component that obstructs the flow of the gas cannot be disposed between the contact and the ventilation hole.

The present invention has been made in view of the above reasons, and an object thereof is to provide a circuit breaker having a high degree of freedom in arranging parts.

The circuit breaker of the present invention includes a housing in which two fixed contacts are respectively housed and held, two movable contacts which can be connected in one-to-one contact with the fixed contact, and are electrically connected to each other, and detect an abnormality. A tripping device is provided which separates the movable contact from the fixed contact, and a vent hole for communicating the inside and the outside of the housing is provided near one of the fixed contacts in the housing. And an arc extinguishing body disposed on the opposite side of the ventilation hole by sandwiching the other fixed contact in the housing.

In the circuit breaker, the arc body may be made of a melamine resin or a polyamide resin containing magnesium hydroxide.

Moreover, in the said circuit breaker, it is preferable that at least one recessed part and a convex part are provided in the surface which faces the said other fixed contact in the said arc body.

Moreover, in the said circuit breaker, the said arc body may be a shape which pinches said other fixed contact in the direction which two said fixed contacts intersect in the parallel direction and the operation direction of the said movable contact.

According to the present invention, since the parts can be arranged on the opposite side of the fixed contact with the arc body inserted, the degree of freedom in the arrangement of the parts is increased as compared with the case where the vent holes are provided on both sides in the direction in which the fixed contacts line up.

1 is a cross-sectional view showing an embodiment of the present invention;
2 is a cross-sectional view showing an important part of the above-described modification.

EMBODIMENT OF THE INVENTION Hereinafter, the most preferable aspect for implementing this invention is demonstrated, referring drawings.

In this embodiment, as shown in FIG. 1, two sets of fixed contacts 11 and 12 and movable contacts 21 and 22 and respective movable contacts 21 and 22 are respectively fixed fixed contact points when an abnormality is detected. The drive device 3 separated from 11 and 12 and the box-shaped housing 4 which accommodated each said part are provided. Hereinafter, up, down, left and right will be described with reference to FIG. 1.

The first terminal 61 to which the other end of the electric wire 5 which one end is connected to the power supply (not shown) is connected to the upper end part of the housing 4 is hold | maintained. Moreover, the 2nd terminal 62 to which the other end of the wire (not shown) which one end was connected to the load is connected to the lower end part of the housing 4 is hold | maintained. The first terminal 61 is electrically connected to the upper fixed contact (hereinafter referred to as "first fixed contact") 11, and the second terminal 62 is connected to the lower fixed contact (hereinafter referred to as "second fixed"). Electrical contact "12).

Each of the movable contacts 21 and 22 is provided on the right side of the upper end and the left side of the lower end of the movable contact 311 made of a metal plate that is vertically long and has a thickness direction in the horizontal direction. The movable contact 311 is integrated with the molding 312 which consists of synthetic resins, for example by insert molding, and comprises the rotor 31. As shown in FIG. The rotor 31 is rotatably supported with respect to the axis | shaft orthogonal to the surface of FIG. 1 with respect to the housing 4. Then, as the rotor 31 rotates from side to side with respect to the housing 4, the movable contacts 21 and 22 respectively contact the corresponding fixed contacts 11 and 12 at substantially the same time. . In the state where each movable contact 21 and 22 contacted the corresponding fixed contact 11 and 12, respectively, the 1st terminal 61 and the 2nd terminal 62 are the fixed contacts 11 and 12 and the movable contact. Electrically connected to each other via the 21 and 22, the movable contact 311, and the like. That is, in this embodiment, two sets of contacts are connected in series between each other between the first terminal 61 and the second terminal 62. Here, in FIG. 1, only one electrical circuit constituted by the first terminal 61, the second terminal 62, the fixed contacts 11 and 12, the movable contacts 21 and 22, and the movable contact 311 is shown. Although it is mentioned, you may provide two or more electrical circuits as mentioned above.

The trip device 3 includes a handle 32, an electromagnet device 33, and an image current transformer 34 that protrude to the right side of the housing 4 and receive an operating force and are rotatable with respect to the housing 4. The electromagnet device 33 has an electromagnet 331 fixed to the housing 4, and a pole 332 made of a magnetic body and driven by the magnetic force of the electromagnet 331. The electromagnet apparatus 33 operates, for example, when a ground fault is detected by the video current transformer 34 or when an overcurrent flows between the second fixed contact 12 and the second terminal 62. The handle 32 and the electromagnet device 33 (pole 332) are each connected to the rotor 31 via an appropriate link (not shown). When an abnormality such as a ground fault or an overcurrent is detected, the electromagnet device 33 is operated so that the rotor 31 is driven to rotate counterclockwise in FIG. 1, whereby each movable contact 21, 22 is a fixed contact, respectively. Separated from (11, 12), the electric circuit between the terminals 61, 62 is cut off. In addition, by rotating the handle 32 manually, the rotor 31 can be rotated to open and close an electric circuit between the terminals 61 and 62. Since the trip device 3 as described above can be realized by a known technique, detailed illustration and description are omitted.

Moreover, in the housing 4, the recessed part 41 is provided in the outer surface of the upper side of the movable range of the 1st movable contact 21 (namely, the vicinity of the 1st fixed contact 11), and this recessed part ( A vent hole 42, which is a through hole communicating with the inner side of the housing 4, is opened on the inner circumferential surface of 41. As shown in FIG. That is, the passage direction of the ventilation hole 42 is a horizontal direction which is a direction which cross | intersects the direction (nearly up-down direction) where the 1st fixed contact 11 and the ventilation hole 42 line. The vent hole 42 serves as a passage of gas generated at the time of contact opening.

Moreover, between the movable range of the 1st movable contact 21 and the ventilation hole 42, the several arc extinguishing plate 71 which divides the arc at the time of a contact opening (three in the figure) is arrange | positioned.

Moreover, the arc body 8 is arrange | positioned under the movable range of the 2nd movable contact 22 (namely, the position which pinches each fixed contact 11 and 12 between the ventilation holes 42). The arc body 8 is made of a material that generates gas when heated. In other words, when an arc occurs between the second movable contact 22 and the second fixed contact 12, arc extinguishing is achieved by the gas generated by heating the extinguishing body 8 by the arc. As the material of the arc body 8, for example, a melamine resin or a polyamide resin containing magnesium hydroxide (Mg (OH) ₂ ) can be used. The arc body 8 made of melamine resin generates hydrogen as the gas, and the arc body 8 made of polyamide-based resin containing magnesium hydroxide generates water vapor as the gas. The gas is discharged out of the housing 4 through the vent hole 42.

Moreover, in the arc body 8, the some convex part 81 is protruded upwards and is arranged in the upper surface which is the surface which faces the 2nd fixed contact 12 to the left and right. Since the site | part inserted in the said convex part 81 can be made into a recessed part relatively, it can also be said that several recessed parts (a groove | channel) are provided in the upper surface of the arc body 8, and arranged in right and left. As a result of the irregularities as described above, since the surface area increases compared with the case where the upper surface of the arc body 8 becomes a plane, the gas generated by the arc body 8 can be increased.

According to the said structure, since the restriction | limiting does not arise in particular about the arrangement | positioning of components on the opposite side (namely, the lower side of the arc extinguishing body 8) of the 2nd fixed contact 12 by inserting the arc extruding body 8, for example, As compared with the case where 8) is not provided and the vent hole 42 is provided in both the upper and lower sides of the housing 4, the degree of freedom in arranging parts such as the electromagnet device 33 and the image current transformer 34 is increased. As a result, the video current transformer 34 can be disposed below the second fixed contact 12.

Here, the arc body 8 is the direction orthogonal to an up-down direction (that is, the direction which the fixed contacts 11 and 12 line up), and a left-right direction (that is, the operation direction of the movable contacts 21 and 22) (FIG. The cross section U-shaped in which the second fixed contact 12 is sandwiched in the direction orthogonal to the surface in Fig. 1 may be used. By adopting the above configuration, the gas generated by the arc body 8 can be increased as compared with the case where the arc body 8 is located only on one side (lower side in FIG. 1) of the second fixed contact 12. .

In the case of having a plurality of electrical circuits as described above, as the arc body 8, instead of using a plurality of arc bodies 8 corresponding to the electric circuit one-to-one, the plurality of arc bodies 8 are connected to each other. One arc body 8 of the same shape can be used. For example, in the case where two electrical circuits as described above are provided side by side in the surface depth direction in FIG. 1, as shown in FIG. 2, the arc body 8 is each second movable contact 22 (and Each second fixed contact 12 can be formed in a cross-sectional E shape in which each electric circuit is individually fitted.

3: trip device
4: Housing
8: Soho body
11: first fixed contact (one fixed contact)
12: second fixed contact (the other fixed contact)
21: first movable contact
22: second movable contact
42: vent hole
81: convex

Claims (4)

A housing that stores and holds two fixed contacts, respectively,
Two movable contacts which are one-to-one contact with the fixed contacts and are electrically connected to each other;
A trip device for detecting an abnormality and separating each movable contact from the fixed contact, respectively,
In the housing, a ventilation hole is provided in the vicinity of one of the fixed contacts to communicate the inside and outside of the housing,
It is made of a material which generates gas when heated, and is provided with an arc extinguishing body which is arranged in the housing on the opposite side of the ventilation hole by sandwiching the other fixed contact.
Circuit breaker. The method of claim 1,
The said arc body consists of a melamine resin or the polyamide resin containing magnesium hydroxide, It is characterized by the above-mentioned.
Circuit breaker. 3. The method according to claim 1 or 2,
At least one of a recessed part and a convex part is provided in the surface which faces the said other fixed contact in the said arc body, It is characterized by the above-mentioned.
Circuit breaker. The method according to any one of claims 1 to 3,
The said arc body is a shape which pinches said other fixed contact in the direction which two said fixed contacts line up, and the direction which intersects the operation direction of the said movable contact, It is characterized by the above-mentioned.
Circuit breaker.

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