JPS62165828A - Switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in switches, particularly circuit breakers for low voltage wiring.

[Conventional technology]

As a circuit breaker among conventional air switches, there is one shown in Application No. 58-181848.

FIGS. 15 to 17 are cross-sectional views of conventional circuit breakers, each showing different operating states. In the figure, b (1) is a cover 1 (2) is a base, and the cover (1) and the base (2) constitute a housing (3). (4) is a fixed contact, which has a fixed conductor (5), has a fixed contact (6) at one end, and an outer conductor (6) at the other end.
(not shown). (
7) is a movable contact, which has a movable conductor (8), and has at one end a movable contact (9) facing the fixed contact (6). (10) is a movable contact device, and (11) is a movable contact arm, which is fixed to the crossbar (2) and is opened and closed when each pole is spaced. (13) is an arc extinguishing chamber, and an arc extinguishing plate (14) is held by a side plate (15). (16
) is a toggle link mechanism consisting of an upper link (17) and a lower link (18). One end of the upper link (17) is beamed. The other end of the lower link (18) is connected to the movable arm (11) of the movable contact device (10). Reference numeral (22) denotes an up/down operation handle, and (23) an operating spring, which is stretched between the shaft (21) of the toggle link mechanism (16) and the operation hand)v (22).

(24) and (25) are thermal and electromagnetic trip mechanisms, respectively, and when activated, pimetal/l/(2
6) and the movable iron core (27).
) in a counterclockwise direction. (29
) is a latch whose one end is locked to the tripper (28) and the other end is locked to the hackle # (19). l/ If (22) is moved to the closed circuit position.

The toggle link mechanism (16) is extended and the shaft (21) is locked to the credo (19), and the movable contact (9) is joined to the fixed contact (6). This state is shown in FIG. 15.

Next, when the operation handle (22) is tilted to the closing position, the barbed WV link mechanism (16) is bent, the movable contact (9) is opened and separated from the fixed contact (6), and the movable arm (11) is moved to the fredle position. It is locked to the shaft (30).

This state is shown in FIG. 16.

Furthermore, if an overcurrent flows through the circuit in the single-path state shown in FIG. The locking is released, the Credo μ (19) rotates clockwise around the Credo shaft (30), and is stopped by the stopper shaft (31). At this time, Credo /I/(1
9) and the upper link (17) is the above-mentioned operating spring (23).
), the toggle link mechanism (16) is bent by the spring force of the operating spring (23), and the crossbar
According to (12), automatic shutoff is performed in conjunction with each Q pole. This state is shown in FIG. 17.

Next, the behavior of the arc that occurs when the circuit breaker cuts off the current will be explained.

Now, when the movable contact (9) and the fixed contact (6) are in contact, the power is transferred from the power source side to the fixed conductor (5).
), fixed contact (6), movable contact (9) and movable conductor (
8) is supplied to the load side via - In this state, when a large current such as a short circuit current flows through this circuit, the movable contact (9) is separated from the fixed contact (6) as described above.

At this time, an arc (
32) occurs, and an arc voltage is generated between the fixed and movable contacts (6) and (9). This arc voltage increases as the separation distance of the movable contact (9) from the fixed contact (6) increases, and at the same time, the arc (32) is directed toward the arc extinguishing plate (14) by magnetic force. It rises further because it is attracted by and elongates. In this way, the arc current reaches a current zero point, extinguishes the arc, and completes the shabT.

[Problem that the invention seeks to solve]

However, conventionally, in this cutoff operation.

The arc (32) does not extend sufficiently, and therefore the dielectric recovery force is insufficient, and in order to ensure high voltage breaking performance, it has been common to increase the opening distance.

The reason why the extension of arc (32) is incomplete is explained in Figure 18 (
I will explain in a) and (b). 7-ri (32) is the same as (a)
The arc-extinguishing plate (14) is driven into the arc-extinguishing plate (14) by a force in the direction of arrow F. As shown in Figure (b), the magnetic flux B generated by the arc (32) is distorted by the magnetic material constituting the arc-extinguishing plate (14), so that the arc (32) is attracted in the direction F in the figure. It is from. As a result, as shown in Figure (a), the legs of the arc (32) are
), and the arc (32) is also slightly extended. However, since there is no force in the direction of arrow V shown in the figure, the arc (32
) The length elongation is small, and no improvement in insulation recovery strength can be expected.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a switch which has a large dielectric recovery force of an arc and can make or break a high voltage.

[Means for solving problems]

In the switch according to the present invention, two sets of arc-extinguishing plates each including a plurality of arc-extinguishing plates are arranged side by side in the opening/closing direction of the contact on an arc-extinguishing vine, and these arc-extinguishing plate groups are made independent of each other. Arranged in parallel, each arc extinguishing plate in the arc extinguishing plate group on the side far from the fixed contact is made of magnetic material,
In addition, the thickness of at least one of the sheets is set to be larger than the thickness of the other sheets.

[Effect]

In this invention, the legs of the arc are drawn in the respective suction directions of the two sets of arc-extinguishing plates and are lengthened, and are also bent by the thick arc-extinguishing plates, so that the dielectric recovery force over the entire length of the arc is large.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

From the arc plates (41a), (41b), (41c), there is a first group of arc extinguishing plates arranged horizontally, and (142) is a plurality of arc extinguishing plates (42a), (42b).

(42c) is a second arc-extinguishing plate group disposed at an oblique angle so as not to be parallel to each other on the first arc-extinguishing plate group (141), and in this example, is both arc-extinguishing plate groups (
141) and (142) are arranged at substantially right angles to each other.

Each of the arc extinguishing plates (41a) to (41c) and (42
a) - (42a) are horseshoe-shaped and arc (3
2) Grooves (143a) and (143b) for visiting
has.

FIG. 2 shows an example of the configuration of the main parts including the arc extinguishing chamber (13) configured as described above. In the figure, an arc runner (51) is fixed to the fixed conductor (5). Movable conductor (8
) is connected to the gap between the first arc-extinguishing plate group (141) and the second arc-extinguishing plate group (142) or the second arc-extinguishing plate group (142) in the open state. ) groove (14
It is set so that it is located in the spatial part of 3). Also,
A first arc-extinguishing plate group (141) is arranged near the fixed conductor (5), and a second arc-extinguishing plate group (142) is arranged far from the fixed conductor (5).

Arc-extinguishing plate (42a) of the arc-extinguishing plate group (142) of W, 2 above
Among the conductors (42c), the one (42a) located farthest from the movable conductor (5) is formed thicker than the other conductors.

In the above configuration, the actual behavior of the arc will be explained with reference to FIG. FIG. 3 shows the state of the arc (32) during a period of high current. The arc (32) is transferred to the tip surface (81) of the movable conductor (8), and from its legs a strong force of electrode vapor is sent to the first arc extinguishing plate group (141) and the second arc extinguishing plate group (142).
) is discharged into the space (140) in the middle of the space (140). The foot position of this large current arc (32) is located at the first arc extinguishing plate group (141).
and the second arc-extinguishing plate group (142);
In addition, since the second arc-extinguishing plate group (142) applies a pulling force to the arc (32) upward in the drawing (in the direction of arrow V), it can quickly move to the conductor tip surface (81). That is, during the large current period preceding the Iltl zero current, the leg of the arc (32) has already reached the conductor tip surface (81).
In other words, it is moving to . Therefore, even if the current rapidly approaches zero, the legs of the arc (32) remain at the conductor tip surface (8
1).

Figure 4 shows the arc (32
). The arc (32) enters the space (140) between the first arc-extinguishing plate group (141) and the second arc-extinguishing plate group (142), and the arc (32) enters the space (140) between the first arc-extinguishing plate group (141) and the second arc-extinguishing plate group (142). receives an upward suction force. This creates an arc (3
2) largely extends into said space (140) as shown in the figure.

In this process, the arc (32) is moved particularly upward in the drawing (in the direction of arrow V) by the arc extinguishing plate (42a), which has a large thickness.
receives power from The positive column portion of the arc (32) is greatly attracted by this force, so as shown in the figure, near the current zero point, it bends and extends toward the arc extinguishing plate (42a). Therefore, the dielectric recovery force over the entire length of the arc is not large, and the arc (32) at high voltage is also interrupted. At this time, the arc (32) receives a force in the direction of arrow F due to the current I passing through the arc runner (51). As a result, the high-temperature conductive gas of the arc (32) flows to the right in the drawing, so the contacts (9) and (6), which have a short distance at the current zero point,
This eliminates the possibility of dielectric breakdown during the process.

Figure 5 shows the grooves (143) of the arc extinguishing plates (41a) to (41c).
A thin groove (144) is further provided in a), and if the thin groove (144) is provided, the elongation effect of the arc (32) will be even greater.

FIG. 6 shows a modification of the fixed conductor (5). The fixed conductor (5) is formed into a U-shape, and an arc runner (5 pieces) is attached to it. In this way, the arc (32) receives electromagnetic force due to the current flowing through the U-shaped conductor (5) and further extends. As shown in FIG. 7, an arc runner (51) may be attached near the contact (6) of the fixed conductor (5).

FIG. 8 shows an arc horn (82) attached to a movable conductor (8), and this shape is also effective in extending the arc (32). FIG. 9 shows another modification of the movable conductor (8). By providing a groove (83) at the tip, the electric current can be shaped and a strong electromagnetic force can be exerted on the arc (32).

Figure 1O shows each arc extinguishing plate (4) of the first arc extinguishing plate group (141).
1a) to (41c) are arranged at a certain angle θ). If this is done, the arc extinguishing plate (41
Dielectric breakdown occurring between the back portions (145) of a) to (41c) can be prevented.

FIG. 11 shows another example of the arc extinguishing chamber (13).

First arc-extinguishing plate group (141) and second arc-extinguishing plate group (142)
The angle θ between the two is set to be an acute angle. In this case, the first arc-extinguishing plate group (141) and the second arc-extinguishing plate group (142)
) with a space between each arc extinguishing plate group (141), (14
2) Any angle is sufficient as long as the direction of the force can be adjusted widely.

FIG. 12 shows another embodiment of the invention. The thick arc-extinguishing plate (42a) in the second arc-extinguishing plate group (142) is replaced by a plurality of thin arc-extinguishing plates (42al) joined together.
(42az), and in this case as well, the same effects as in the above embodiment can be achieved.

FIG. 13 shows still another embodiment of the present invention, in which arc-extinguishing plates (42a) to (42) in a second arc-extinguishing plate group (142) are shown.
In c), the thickness of the arc-extinguishing plate (42c) on the side closer to the tip (81) of the movable conductor (8) is determined by the large plate (42c).
The legs of the arc (32) run to the tip of the distal surface (81), thereby elongating the arc (32).

The magnetic effect related to the running of the legs of the arc (32) has a weak effect when the current is large because the pressure of the steam emitted from the legs of the arc (32) is strong, but the effect is large when the current is small. Therefore, the embodiment of FIG. 13 is effective for disconnecting high α-pressure circuits in load and overload regions.

〔Effect of the invention〕

As described above, in the present invention, two sets of arc-extinguishing plates each consisting of a plurality of arc-extinguishing plates are arranged in parallel in the opening/closing direction of the contact in an arc-extinguishing chamber, and both arc-extinguishing plate groups are disposed non-parallel to each other. By forming at least one of the arc extinguishing plates in the group of arc extinguishing plates on the side far from the fixed contact to be thicker than the others, the legs of the arc are stretched in two directions. Moreover, the thick arc-extinguishing plate is bent and stretched to a large extent, which has the effect of increasing the dielectric recovery force.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the arc extinguishing chamber in the switch according to the present invention, Fig. M2 is a perspective view showing the configuration of the main part including the arc extinguishing chamber, and Fig. 3 is the arc extinguishing chamber in the switch according to the present invention. Fig. 4 is a diagram explaining the state of the arc near the current zero point, Fig. 5 is a plan view showing a modified example of the groove of the arc extinguishing plate, Fig. M6 and Fig. 7. is a side view showing a modification of the fixed conductor, FIGS. 8 and 9 are side views showing a modification of the movable conductor, and FIG. 10 is a sectional view showing a modification of the arrangement of the second arc-extinguishing plate group. , FIG. 11 is an explanatory diagram of the arrangement angle of the first arc-extinguishing plate group and the second arc-extinguishing plate group, and FIG. 12 is a modification of the thick arc-extinguishing plate of the second arc-extinguishing plate group. Cross-sectional view of disconnector, 1st
FIGS. 8(a) and 8(b) are explanatory diagrams of the extended state of the arc of a conventional switch. (3)...Housing, (4)...Fixed contact, (5)...
... Fixed conductor, (6) ... Fixed contact, (7) ... Movable contact, (8) ... Movable conductor, (9) ... Movable contact % (13) ... Arc extinction Chamber, (32)...Arc, (
41a). (41b), (41c), (42a), (42a1),
(42a2), (42b), (42c)... Arc-extinguishing plate,
(51)...Arc runner, (81)...Tip surface,
(141)...First arc-extinguishing plate group, (142)...Second arc-extinguishing plate group h (143a), (143b)--Groove portion, (144)...Small groove, θ ··angle. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (5)

[Claims] (1) A pair of movable and fixed contacts consisting of a contact point and a conductor to which the contact point is fixed, an insulating casing housing both of these contacts, and a pair of movable and fixed contacts provided within the casing. In a switch having an arc extinguishing chamber for extinguishing an arc generated between contacts, the arc extinguishing chamber has two sets of arc extinguishing plates arranged in parallel in the opening/closing direction of the contacts. It is equipped with a group of arc extinguishing plates, both arc extinguishing plate groups are arranged non-parallel to each other,
Each of the arc-extinguishing plates in the arc-extinguishing plate group on the side far from the fixed contact is made of a magnetic material, and at least one of the arc-extinguishing plates in the group is thicker than the others. A switch with (2) The switch according to claim 1, wherein the thickness of the arc-extinguishing plate on the side farther from the tip of the movable contact is greater than the thickness of the other arc-extinguishing plates. (3) The switch according to claim 1 or 2, wherein the fixed contact has an arc runner. (4) The arc-extinguishing plate is made of a magnetic material, and each of the arc-extinguishing plates in the arc-extinguishing plate group on the side closer to the fixed contact among both arc-extinguishing plate groups is formed into a horseshoe shape, and the arc-extinguishing plate has a U At the bottom of the letter-shaped groove,
The switch according to claim 1, 2, or 3, wherein narrow grooves for inducing an arc are connected. (5) In the arc-extinguishing plate group on the side closer to the fixed contact, each of the arc-extinguishing plates is arranged in a substantially fan shape at a constant angle. The switch according to item 3 or 4.