JPH0343920A - Circuit breaker - Google Patents

Abstract

PURPOSE:To save a space for providing an arcing horn to reduce the size of a circuit breaker by a method wherein a magnetic plate comprises an engaging member and an arc suppressing member provided continuously with the engaging member and with a specific angle while the engaging member is fitted into a groove so that an end of the arc suppressing member is positioned in the vicinity of a contact and facing the arc. CONSTITUTION:Magnetic plates 31 to 33 comprise engaging members 31a to 33a fitted into grooves 12, 14, 16 and arc suppressing members 31b to 33b provided continuously with the engaging members 31a to 33a with specific angles, Therefore, whichever directional relationship the lengthwise direction of the grooves 12, 14, 16 and opening directions of contacts 4, 6 are in, by selecting the angles of the engaging members 31a to 33a with respect to the arc suppressing members 31b to 33b at a specific angle, ends of the magnetic plates 31 to 33 can be positioned in the vicinity of the contact 4, 6. Thus an arcing horn for guiding an arc to the ends of the magnetic plates 4, 6 does not need to be provided thereby saving a space while the size of a circuit breaker can be reduced since the directions of the grooves 12, 14, 16 can be selected without being limited by the opening directions of the contacts 4, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a circuit breaker equipped with a de-ion arc extinguishing device, such as a no-fuse circuit breaker (hereinafter referred to as NFB).

[Conventional technology]

Figures 5 to 8 show the conventional NFII, with Figure 5 being a partial sectional view showing the de-ion arc extinguishing device (hereinafter referred to as the arc extinguishing chamber), and Figure 6 being the arc extinguishing magnetic plate (hereinafter referred to as the magnetic (called a board)
FIG. 7 is a perspective view showing the details of the groove into which the magnetic plate is fitted as seen from the left side of FIG. 5, and FIG. 8(a), (
b) is a plan sectional view and a side sectional view showing cross sections of the arc extinguishing chamber at cutting planes ■a■a and ■b-■h, respectively. In these figures, (1) is a base molded from synthetic resin, (
1a> is the mounting surface for attaching to a fixed part such as a panel, (
2) is a cover removably provided on the base (1), (
3) is a power supply side terminal fixed to the base (1), (4) is a fixed contact provided by extending the power supply side terminal (3), (
4a) is a fixed contact provided on a fixed contact (4), (5
) is provided at the tip of the fixed contact (4) and extends upward to guide the arc upward, and (6) is rotatably supported by the base (11) and includes an operating mechanism (not shown). (6a) is a batch contact; (7) is a movable contact that is opened and closed in the direction of arrow A in the figure with respect to the fixed contact (4).
is a movable arc horn provided by extending the tip of the movable contact (6). (81, (91 (Fig. 7) is a pair of support members provided facing the base (1) with a set of fixed contacts (4) and movable contacts (6) sandwiched between them, which are opened and closed. In this example, it is molded integrally with the base (1). (101 (11) is the supporting member (8), (9
1, (12) and (13) are opposing surfaces 001. <11) are provided in pairs and have linear first grooves with open upper ends, and are provided in a direction perpendicular to the mounting surface (1a) of the base. (14) and (1
5), (16) and (17) are opposite surfaces (+01).

<11) are provided at a predetermined distance p from the first grooves (12) and (13), and the second grooves forming a pair, respectively. This is the third groove. Each of the grooves (12) to (17) has a rectangular cross section with a length l, a width W, and a depth d, as shown in FIG.
Each bottom surface (12a) to (17a) and end surface (12b)
~(17b). (18) is a magnetic plate made of a flat steel plate, which is a magnetic material, and as shown in FIG.
17), and a V-shaped notch (18c) for arc induction provided at one end (18b) is connected to the movable contact (6).
It is designed to face the arc that occurs when the valve is opened.

In this example, the dimension Wl (Fig. 6) between the outer sides of the ear pieces (18a) of the magnetic plate is the bottom surface (12a) of the pair of grooves.
and (13a>, (14all and (15aL) (16a)
and (17a), and the plate thickness t of the lug portion (18a) of the magnetic plate is slightly smaller than the distance W2 (Fig. 7) between each groove portion (12).
) to (17) (see FIGS. 6 and 7), and the groove portions (12> and (+3)) in which the lug portions (18a) of the magnetic plate form a pair.

(14) and (15), <16) and <17) are loosely fitted into each other and abut against the end faces (+2h) to (+7b) of each groove, and the other end (18d) of the magnetic plate <18> The arc extinguishing chamber is configured by being held down by the protruding portion (2a) of the cover so that it does not come out. Note that (19) is a handle for operating the movable contact (6) via an operating mechanism (not shown);
(20) is an insulating barrier. The arc extinguishing chamber has grooves (I2), (13), (14> and (15L) (+6
) and <17> from the open end of the magnetic plate ear piece (1
8a) and is prevented from being removed by the cover (2), the structure is simple and can be easily assembled.

Next, the operation will be explained. For example, when an excessive current (3) flows through the circuit, an overcurrent tripping device (not shown) operates and operates the movable contact (6) via the operating mechanism, causing both contacts f4) and (6) to operate. As is well known, the arc generated between the fixed and movable arc horns (51° (7) It travels through the arc and is guided upward in Figure 5, forming a horizontal arc.
It is attracted from one end (18b) of the magnetic plate (notch part (18c)) to between the magnetic plates (+8), and is divided into a large number of series small gap arcs and extinguished 9 [Problem to be solved by the invention] The conventional NFB has an arc extinguishing chamber that has a simple structure and is easy to assemble as described above, but since the magnetic plates (18) are flat, one end (+8b) of each magnetic plate is connected to the contactor (4). ]
Since it is not possible to install the arc horn (5) in close proximity to 61 and the two are far apart, the fixed arc horn (5) is extended far to the right in the figure as shown in Figure 5 to make contact. The arc generated between the wires must be guided to the vicinity of one end (18b) of the magnetic plate, and extra space is required to provide the fixed arc horn (5). There was a problem that it could not be made smaller.

This invention was made to solve the above-mentioned problems, and the purpose is to obtain a circuit breaker that inherits the features of the conventional arc extinguishing chamber, which is simple and easy to assemble, and can be made smaller. shall be.

[Means to solve the problem]

The circuit 11'8 disconnector according to the present invention includes a plate-shaped engagement member made of a magnetic material and a plate-shaped arc extinguishing member made of a magnetic material provided continuously to the engagement member at a predetermined angle. Straight lines with one end open and arranged in pairs on each of the opposing surfaces of a holding member, which constitutes a magnetic plate and is provided facing the base with a pair of contacts to be opened and closed sandwiched therebetween. The arc-extinguishing chamber is constructed by fitting the engaging member of the magnetic plate into the shaped groove so that one end of the arc-extinguishing member faces the arc generated when the contact is opened.

[For production]

In this invention, since the magnetic plate is constituted by the engaging member fitted in the groove and the arc-extinguishing member provided continuously at a predetermined angle to the engaging member, the longitudinal direction of the groove and the contact By selecting a predetermined angle between the engaging member and the arc-extinguishing member, one end of the magnetic plate can be positioned near the contact regardless of the directional relationship between the opening and closing direction of the magnetic plate. Therefore, there is no need to install a long arc horn 41 to guide the arc near one end of the magnetic plate, which saves space.Also, since the direction of the groove can be selected without being restricted by the opening/closing direction of the contact, the circuit can be interrupted. The container can be made smaller,
Moreover, an arc extinguishing chamber with a simple structure and easy assembly can be obtained.

[Embodiments of the invention]

Figures 1 and 2 show an embodiment of the present invention. Figure 1 is a partial sectional view showing the arc extinguishing chamber of the NFB, and Figure 2 is a perspective view of the L-shaped grid, which is a magnetic plate. The shape of the magnetic plate is L-shaped compared to the conventional device shown in FIG. 6. In these figures, (↑) to (20) are the same as in the conventional device described above, so their explanation will be omitted. In Figure 2 (31)
- (33) are magnetic plates, in this example L-shaped lids (hereinafter simply referred to as grids) made of steel plates, which are magnetic materials;
) to plate-shaped engagement member (31a) fitted to (17).
(33a) and arc-extinguishing members (31b) to (33b) provided continuously to and at a predetermined angle θ to the engaging members <31a) to (33a), respectively, as shown in FIG. The thickness of the lug portions (31c) to (33c) provided on the side edge portions is t, the dimension between the outer sides is Wl, and they are loosely fitted into the groove portions (12) to (17) as in the above conventional example. Each arc extinguishing member (
One end (31d) of (31b) to (33b) to (33d
) are V-shaped notches (31e) to (33e) of the contacts (4
), (6), that is, the movable contact (
6) is made to face the arc generated when it is opened, and is prevented from being removed by a protrusion (2a) of the cover. (34> is a fixed arc horn that is provided by slightly extending the fixed contact (4), and one end of the grid (31d) to (33d) is located near the contacts (4) and (6). As shown in the figure, there is no need to extend the fixed side arc horn (51) long to guide the arc to one end (+8b) of each magnetic plate (18) in the conventional example shown in FIG. It has been shortened.

Figure 3 shows a grid showing another embodiment of this invention.
-(43) is a perspective view of the engaging members (31a)-(33a) of the grids (31)-(33) shown in FIG.
Square holes (41a) to (43a) are provided in the center of the hole. In this embodiment, the arc generated when the movable contactor (6) is opened is transmitted from the V-shaped notches (31e) to (33e) at one end of the grids (41) to (43) to the arc extinguishing member (31b) to (33b) becomes a series small gap arc and is extinguished, as in the embodiment of FIG.
are provided with square holes (41a) to (43a), so the arc attracted between the arc extinguishing members (31b) to (33t+) moves along the arc extinguishing members (31b) to (33b). However, the bottoms of the square holes (41a) to (43a), that is, the engaging members (31a) to (33a) and the arc extinguishing members (31b) to (3
3b), it stops near the engaging part and does not move any further, and the movable arc horn (the space to the right of the tip of the sword is a rectangular hole (4, 1a) to (4, 3a) By providing a large opening, the substantial arc extinguishing space becomes larger.Therefore, compared to the embodiment shown in FIG.
Third groove part (12) and (13L) (14) and (15L
(+6) Even if the distance p between the pair of (d) and (17) is made small (see Figure 7), a substantial breaking ability can be secured, so the distance p can be made smaller than in the embodiment shown in Figure 2. The NFB can be further downsized.

Also, in FIG. 4, square notches (51a) to (53a) are used instead of the square holes (41a) to (43a) shown in FIG. 3, based on the same concept as the embodiment in FIG. It is a perspective view of grids (51) to (53) provided with grooves (12).
) to (+7) with loose fit. In this case, machining of the notches (51a) to (53a) is easier than in the embodiment shown in FIG.

In each of the above embodiments, the grid is shown to be loosely fitted into the groove and prevented from being removed by the protrusion (2a) of the cover, but it is also possible to fit the grid loosely into the groove so that the tabs of the grid are tightly fitted into the groove. For example, in the embodiment of FIG.
5aL The gap W2 between (16a) and (17a) is made slightly larger than that shown in FIG. 7, and the magnetic pieces (51) to (53) are elastically deformed in the width W1 direction to form grooves (12) to (17a), respectively.
The cover (2) prevents the magnetic plates (51) to (53) from being removed from the grooves (12) to (17) by inserting the magnetic plates (51) to (53) into the grooves (7) and engaging them elastically. It is also possible to omit the protrusion (2a) in place of the stop.

Furthermore, the direction of the groove is not limited to being perpendicular to the mounting surface (IR) of the base, but the grid can be adjusted by selecting the angle between the engaging member and the arc-extinguishing member depending on the opening/closing direction of the contact. It is sufficient to determine the direction in which it is easy to insert the grooves, and the spacing between the pairs of grooves does not have to be equal. It should be kept indoors.

Note that the holding members (8) and (91) may be manufactured separately without being integrally molded with the base (1).

In addition, the circuit breaker may be an earth leakage breaker, an air circuit breaker, or any other circuit breaker other than the NFB, and the same effect can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the magnetic plate is constituted by an engaging member and an arc-extinguishing member provided continuously to the engaging member at a predetermined angle, and one end of the arc-extinguishing member is connected to the contact. Since the engaging member is fitted into the groove so as to be located near the arc and face the arc, one end of the arc-extinguishing member is always in contact regardless of the opening/closing direction of the contact and the direction of the groove is set arbitrarily. Since the arc horn that guides the arc to the magnetic plate does not have to be extended for a long time, the space for installing the arc horn can be saved, and the structure is simple and easy to assemble compared to the conventional arc extinguishing chamber. It is possible to downsize the circuit breaker while still taking advantage of its features.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, in which FIG. 1 is a partial sectional view showing the arc extinguishing chamber part of the NFB, FIG. 2 is a perspective view of the grid, which is a magnetic plate, and FIG. Fig. 4 is a perspective view of a grid showing other embodiments of the present invention, Figs. 5 to 8 show a conventional NFB, and Fig. 5 is a partial sectional view showing an arc extinguishing chamber portion. , Figure 6 is a perspective view of the magnetic plate, and Figure 7 is a perspective view of the magnetic plate.
The figure is a perspective view showing details of the groove in which the magnetic plate (11) is fitted, FIG. 8(a),
(b) is a plan sectional view and a side sectional view showing cross sections of the arc extinguishing chamber along cut planes ■a--a and ■b--b, respectively. In the figure, (1) is the base, (4) is the fixed contact, (
6) is a movable contact, fil, (91 is a pair of support members, 00). (11) is the opposite surface, (12) and (13), (14) and (
15), (+6) and (17) are pairs of grooves, (
31) ~ (33), (41) ~ (43), (51) ~ (
53) is a grid, (31a) to (33a) are engaging members, (31b) to (33b) are arc extinguishing members, and (31d) to (
33d) is one end portion, and (31e) to (33e) are cutout portions. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A pair of supporting members having opposing surfaces that are provided on the base with a pair of contacts that are operated to be opened and closed sandwiched therebetween; A groove, a plate-shaped engagement member fitted into the groove, and a plate-shaped engagement member provided continuously with the engagement member at a predetermined angle so that one end faces the arc generated when the contactor is opened. A circuit breaker equipped with a de-ion arc extinguishing device constituted by an arc extinguishing magnetic plate made of a magnetic material and having a plate-shaped arc extinguishing member.