JPH0471123A - Switch - Google Patents

Abstract

PURPOSE:To improve cutoff performance by dividing the fixed contact of a plate-shaped metal arc-extinguishing grid into two or more in parallel in the length direction, folding the divided metal arc-extinguishing grids into U-shaped metal arc-extinguishing grids, and directing the folded ends of the U-shaped metal arc-extinguishing grids to the open space. CONSTITUTION:When a moving contact 6 is opened, an arc 12 is generated across the moving contact 6 and a fixed contact 8a. The arc 12 is then moved to divided U-shaped metal arc-extinguishing grids 13a to become a moving arc 12b. The moving arc 12b is driven in the direction apart from the open space of contacts 6a, 8a by the mutual action of the magnetic field generated by the current flowing in the moving arc 12b and the current flowing in the divided U-shaped metal arc-extinguishing grids 13a and the current flowing in the moving arc 12b. The moving arc 12b passes many divided U-shaped metal arc-extinguishing grids 13a, its length is extended, and the moving arc 12b is cooled and smoothly extinguished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switch that switches on and off current.

[Prior art] As a conventional switch, for example, the Japanese Utility Model Publication No. 63-42447
There is an electromagnetic contactor shown in the publication, and FIG. 7 is a partial sectional view thereof. Since this electromagnetic contactor is bilaterally symmetrical, only the right side is shown in cross section.

In the same figure, (1) is a mounting made of plastic or the like, (2) is a fixed core laminated with silicon steel plates on the base (1), and (3) is a fixed core (2). The movable core (4), which is placed facing each other and laminated with silicon steel plates, provides a driving force that causes the movable core (3) and the fixed core (2) to stick together against a spring (not shown). The operating coil (5) is made of plastic and has a square window, and a movable iron core (3) is held at the lower end of the crossbar. (6) is a movable contact inserted into the corner window of the crossbar (5) and held by a push spring (7); (8a) is a movable contact joined to the movable contact (8); ) is a fixed contact that is provided opposite the movable contact (6) and conducts current flow, (8a) is a fixed contact joined to this fixed contact (8), and (8b) is also a fixed contact that is connected to this fixed contact (8). The terminal portion of the contactor (li) is shown. (9) is a terminal screw for connecting the electromagnetic contactor body to an external circuit;
10) is a base on which the fixed contact (8) is attached, (11)
) is a cover that covers the top surface of the electromagnetic contactor, and inside it is a magnetic plate metal plate for extinguishing the arc (12) that occurs between the fixed contact (8a) and the movable contact (6a). An arc extinguishing grid (13) is provided and serves as an arc extinguishing chamber.

As is clear from the figure, the metal arc-extinguishing grids (13) are stacked in parallel with each other, facing the movable contact (6), above the fixed contact (8), and spaced apart from each other by a predetermined distance.

A conventional electromagnetic contactor has the above configuration, and its operation will be explained below. When the operating coil (4) is demagnetized in the electromagnetic contactor shown in Fig. 7, the movable core (3) is separated from the fixed core (2) by a tripping spring (not shown), and the crossbar (5) is also separated from the fixed core (2). occupies the top position,
An arc (
12) is generated, but this arc (12) is attracted to the plate-shaped metal arc extinguishing grid (13) made of magnetic material, and becomes a transition arc (12a) as shown in FIG. 7, and this transition arc (12a) is cooled by a plate-shaped metal arc-extinguishing grid (13) and the current is interrupted.

[Problems to be Solved by the Invention] A conventional electromagnetic contactor is configured as described above, in which a plurality of plate-shaped metal arc-extinguishing plates (IB) are connected to fixed contacts (IB) at predetermined intervals.
Since the arc (12) is cumulatively installed above, even if the arc (12) is generated when the current is cut off and the arc (12a) moves to the plate-shaped metal arc extinguishing grid and becomes dogleg-shaped, the arc (
Since the arc length of 12a) is approximately limited to the interval between the metal arc-extinguishing grids (13), there is a problem that it cannot be made sufficiently long, resulting in poor interrupting performance. In addition, the plurality of plate-shaped metal arc-extinguishing grids (13) have a problem in that hot gas cooling is not sufficient because the hot gas flows in a constant direction and the flow rate is restricted.

The present invention was made in order to solve the above problems, and an object of the present invention is to obtain a switch that has excellent shutoff performance and can efficiently cool and discharge hot gas.

[Means for Solving the Problems] A switch according to the present invention includes a fixed contact to which a fixed contact is joined, a movable contact to which a movable contact that makes contact with and separates from the fixed contact is joined, and the movable contact. and a plurality of plate-shaped metal arc-extinguishing grids arranged above and in parallel with the fixed contact and facing each other, at least one of the plate-shaped metal arc-extinguishing grids. The metal arc-extinguishing grid is divided into at least two parts in parallel to the length direction of the fixed contact or in a radial direction from the tip of the fixed contact, and at least one of the divided metal arc-extinguishing grids is folded. The U-shaped metal arc-extinguishing grid is bent to form a U-shaped metal arc-extinguishing grid, and the bent tip of the U-shaped metal arc-extinguishing grid is directed toward the separation space of the contact.

In addition, at least one plate-shaped metal arc-extinguishing grid is divided into at least two or more pieces in parallel to the length direction of the fixed contact or in a radial direction from the tip of the fixed contact, and the divided At least one of the metal arc-extinguishing grids is a metal arc-extinguishing grid of a hollow vibe, and a cut groove is provided in the metal arc-extinguishing grid of the hollow vibe by making a cut in a direction farther from the separation space of the contact. It may be something.

[Function] In the switch of the present invention, at least one of the plurality of plate-shaped metal arc extinguishing grids facing the movable contact and cumulatively arranged above the fixed contact is connected to the fixed contact over the length of the fixed contact. The metal arc-extinguishing grid is divided into at least two parts parallel to each other or radially from the tip of the fixed contact, and at least one of the divided metal arc-extinguishing grids is bent to form a U-shaped metal arc-extinguishing grid. Either form an arc grid and direct the bent end of the U-shaped metal arc extinguishing grid toward the open space of the contact, or connect at least one of the divided metal arc extinguishing grids to a metal arc extinguishing grid of a hollow pipe. Since the metal arc extinguishing grid is made with cut grooves from the side farther from the contact opening space, metal extinguishing of hollow vibrators with split U-shaped or cut grooves is possible. The transition arc can be stretched across multiple arc grids to increase the arc voltage and lower the current peak value, and has a U-shaped or cut groove that separates the current flowing through the transition arc. The interaction between the magnetic field generated by the current flowing through the metal arc-extinguishing grid of the hollow vibrator and the current flowing through the transitional arc allows the transitional arc to be driven away from the opening space of the contacts.

In addition, the metal arc-extinguishing grid, which is a hollow pipe with a U-shape or cut grooves, has a wider surface area and is divided, which eases restrictions on the direction of gas exhaust, and prevents arcing. The flow of hot gas becomes smoother, and the temperature does not get too high and it is discharged.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial side view of the arc-extinguishing chamber portion of an electromagnetic contactor according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of the metal arc-extinguishing grid of FIG. 1 viewed from the contact direction.

In the figure, (6) is a movable contact, (Ba) is a movable contact joined to this movable contact (6), (8a) is a fixed contact that makes contact with and separates from this movable contact (6a), and (8) is a movable contact that is connected to this movable contact (6). This is a fixed contact joined to this fixed contact (8a). (12)
operates the movable contactor (6) and contacts (8a), (8a)
The arc (13a) generated when the switch is opened is replaced by a plate-shaped metal arc extinguishing grid (13) in the conventional switch shown in Fig. A U-shaped metal arc-extinguishing grid is formed by dividing the divided metal arc-extinguishing grid into, for example, four parts in a U-shape, and each U-shaped metal arc-extinguishing grid (13a ) is oriented in the direction in which the contacts are opened. (12a) shows the arc that has migrated to the divided U-shaped metal arc extinguishing grid (13a) after the arc (12) has occurred.

In the electromagnetic contactor configured as described above, when the movable contact (8) opens, the arc (12) connects to the movable contact (6).
This occurs between the fixed contact (8a) and the fixed contact (8a). Then the arc (12
) transitions to the divided U-shaped metal arc-extinguishing grid (13a) and becomes a transition arc (12b). The transition arc (12b) is caused by the interaction between the current flowing through the transition arc (L2b), the magnetic field generated by the current flowing through the divided U-shaped metal arc-extinguishing grid (lla), and the current flowing through the transition arc (12b). is a contact (6a).

It is driven in the direction away from the separated space (8a).

In addition, since the transition arc (12b) waves through a large number of divided U-shaped metal arc extinguishing grids (13a) as shown in FIG. Since the length of the transition arc (12b) becomes longer than the transition arc (12b), the arc voltage increases. As a result, the current serving as the energy of the arc is reduced, and the transitional arc (12b) is cooled and smoothly extinguished by the divided U-shaped metal arc extinguishing grid (13a).

In addition, since the U-shaped metal arc-extinguishing grid (13a) is divided, hot gas can flow up and down, making the movement of hot gas smoother than when using a plate-shaped metal arc-extinguishing grid (13). As a result, the heating of the hot gas due to the arc is relaxed, the temperature of the hot gas does not rise, and the hot gas is discharged without increasing its cooling effect.

FIG. 3 is a partial side view of the arc-extinguishing chamber portion of an electromagnetic contactor according to another embodiment of the present invention, and FIG. 4 is a view of the metal arc-extinguishing grid of FIG. 3 viewed from the contact direction. In the figure, (
6) is a movable contact, (8a) is a movable contact joined to this movable contact (6), (8a) is this movable contact (Ba)
The fixed contact (8) is a fixed contact that is connected to the fixed contact (8a).

(12) operates the movable contactor (6) and contacts (6a);
(8a) Arc generated when opening, (13b)
The conventional plate-shaped metal arc-extinguishing grid (13) is divided into, for example, four parts in the length direction of the fixed contact (8), and cuts are made in the divided metal arc-extinguishing grid to form cut grooves (13c). )
Hollow pipe metal arc extinguishing grid, formed with (
12b) shows the arc that has migrated to the metal arc extinguishing grid (13b) of the hollow pipe with cuts after the arc (12) has occurred. As shown in Fig. 4, the metal arc-extinguishing grid (13b) of the hollow pipe having the cut grooves (13c) extends parallel to the upper surface of the fixed contact (8) at the contact points (6a), (8).
The incision is made from the side farther away than the separation space in a).

In the embodiment shown in FIGS. 3 and 4, the movable contact (6)
When the contacts are opened, an arc (12) is generated between the movable contact (6a) and the fixed contact (8a). Thereafter, the arc (12) transfers to a hollow pipe metal arc extinguishing grid (13b) having cut grooves (18c), becoming a transitional arc (12b).

Due to the interaction between the current flowing through the transition arc (12b), the magnetic field generated by the current flowing through the metal arc extinguishing grid (13b) of the hollow pipe with cuts, and the current flowing through the transition arc (12b), the transition arc (12b) ) is driven in the direction away from the separation space of the contacts (8a) and (8a). In addition, since the transitional arc (12b) waves many times through the metal arc extinguishing grid (13b) of the hollow pipe having cut grooves (13c) as shown in FIG. The length of the transition arc (12b) is longer than that of the arc grid (13), which increases the arc voltage and lowers the current peak value. The transitional arc (12b) is cooled and extinguished by the arc grid (13b).In addition, the metal arc extinguishing grid (13b), which is a hollow pipe with cuts,
) is divided, so a plate-shaped metal arc extinguishing grid (1
The movement of the hot gas becomes smoother than in the case of 3), the heating of the hot gas by the arc is relaxed, the temperature does not rise, and the cooling effect is further improved.

In addition, in the above embodiment, the U-shaped or cut groove (13c
) Metal arc extinguishing grid of hollow pipes (lla)
, (13b) is a conventional plate-shaped metal arc extinguishing grid (13
) is formed by being divided in the length direction of the fixed contact (8), but it may also be formed by being divided in a radial direction with the tip of the fixed contact (8) as a base point. Further, in the above embodiments, all metal arc extinguishing grids (13a) are U-shaped or cut hollow pipes that are equally divided.
, (13b) is shown, but Fig. 5(a)
As shown in ~(e), a divided U-shaped metal arc-extinguishing grid (13a) or a hollow pipe metal arc-extinguishing grid (13b) with cuts, and a plate-shaped metal arc-extinguishing grid (13) or It is also possible to combine divided plate-shaped metal arc extinguishing grids (13c). As shown in FIGS. 6(a) to 6(d), the arrangement of the metal arc-extinguishing grids may be random. In Figures 1 to 6, the divided U-shaped metal arc-extinguishing grid (18a) and the small hollow pipe metal arc-extinguishing grid (18b) are oval or circular, and the metal arc-extinguishing grid (18b) is shaped like a metal plate. Although the arc-extinguishing grid (13) and the divided plate-shaped metal arc-extinguishing grid (Ltd) are shown as rectangles so as to be distinguishable from each other, there is no restriction on their shape, and they may be either circular or polygonal.

Further, in the above embodiment, the case of an electromagnetic contactor has been described, but a disconnector, a circuit breaker, or other switching device may be used, and the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, the present invention provides at least one of the plurality of plate-shaped metal arc-extinguishing grids in parallel to the length direction of the fixed contact or radially from the tip of the fixed contact. A U-shaped metal arc-extinguishing grid is formed by dividing the metal arc-extinguishing grid into at least two parts in the direction of t, and bending at least one or more of the divided metal arc-extinguishing grids. Either the bent end of the grid is directed toward the opening space of the contact, or at least one of the divided metal arc-extinguishing grids is formed into a metal arc-extinguishing grid of a hollow pipe, and the opening of the contact is directed to the metal arc-extinguishing grid. Since the cut grooves are made by cutting from the side farther from the space, the transition arc can be passed across many of the metal arc extinguishing grids of the divided U-shaped or hollow pipes with cut grooves. It can stretch the arc, increase the arc voltage, and lower the current peak value, and is generated by the current flowing in the transition arc and the current flowing in the metal arc extinguishing grid of the hollow pipe with a U-shaped or cut groove. The interaction between the magnetic field and the current flowing through the transitional arc allows the transitional arc to be driven in a direction away from the open space of the contacts, resulting in improved breaking performance.

In addition, the metal arc extinguishing grid of the hollow vibrator, which has a divided U-shape or cut grooves, has a wider surface area and is divided, which eases restrictions on the direction of gas exhaust, so arc This has the effect that the flow of the generated hot gas becomes smoother and is discharged without the temperature becoming too high, thereby improving the cooling effect.

[Brief explanation of the drawing]

Fig. 1 is a partial side view of the arc extinguishing chamber portion of an electromagnetic contactor according to an embodiment of the present invention, Fig. 2 is a configuration diagram of the metal arc extinguishing grid shown in Fig. 1 viewed from the contact direction, and Fig. 3 is a main FIG. 4 is a partial side view of the arc-extinguishing chamber portion of an electromagnetic contactor according to another embodiment of the invention; FIG. 4 is a configuration diagram of the metal arc-extinguishing grid of FIG. 3 viewed from the contact direction; e), Figure 6(a) - (
d) is a configuration diagram showing various arrangements and arrangements of the metal arc-extinguishing grids shown in FIGS. 2 and 4, and FIG. 7 is a partial sectional view of a conventional electromagnetic contactor. (6) is a movable contact, (6a) is a movable contact, (8) is a fixed contact, (8a) is a fixed contact, (12) is an arc, (
12b) is a transition arc, (13) is a plate-shaped metal arc-extinguishing grid, and (13a) is a divided U-shaped metal arc-extinguishing grid. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Patent Attorney Muneharu Sasaki Figure 1 Grid Figure 3 Figure 2 Figure 4 ooo. Orororoooo. (a) (b) ooo. [===ko [===koooo. (c)ooo. Rororo O○00 (d) (e) 13a (13b) (a) 0OO (b) 13a (13c) ノ (c) (d)

Claims (2)

[Claims] (1) A fixed contact to which a fixed contact is joined, a movable contact to which a movable contact that makes contact with and separates from the fixed contact is joined, and a movable contact facing the movable contact and placed above the fixed contact. In a switch equipped with a plurality of plate-shaped metal arc-extinguishing grids arranged cumulatively in parallel, at least one or more of the plate-shaped metal arc-extinguishing grids are arranged parallel to the length direction of the fixed contact. Alternatively, the fixed contact is divided into at least two parts in a radial direction from the tip thereof, and at least one of the divided metal arc-extinguishing grids is bent to form a U-shaped metal arc-extinguishing grid. A switch characterized in that the bent end of the U-shaped metal arc-extinguishing grid is directed toward the opening space of the contact. (2) A fixed contact to which a fixed contact is joined, a movable contact to which a movable contact that comes into contact with and separates from the fixed contact is joined, and a movable contact facing the movable contact and above the fixed contact. In a switch equipped with a plurality of plate-shaped metal arc-extinguishing grids arranged cumulatively in parallel, at least one of the plate-shaped metal arc-extinguishing grids is arranged parallel to the length direction of the fixed contact or The stationary contact is divided into at least two parts in a radial direction from the tip thereof, at least one of the divided metal arc-extinguishing grids is used as a metal arc-extinguishing grid of a hollow pipe, and the metal arc-extinguishing grid of the hollow pipe is A switch characterized in that a cut groove is provided in the arc-extinguishing grid by making a cut from a side farther from the separation space of the contact.