JPH0654630B2 - Auxiliary arc extinguishing device for switch - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an auxiliary arc extinguishing device for a switch in an electric vehicle or the like, and in particular, an auxiliary switch suitable for a DC electric vehicle with an overhead wire voltage of 3000V. Regarding an arc extinguishing device.

[Conventional technology]

In a vehicle such as an electric car equipped with a switch under the floor, a device for limiting the spread range of the arc ejected from the arc chute of the switch as much as possible and diverting the ejection direction downward, so-called auxiliary It is customary to install an arc extinguishing device in the switch box.

By the way, as such an auxiliary arc-extinguishing device, a device based on the de-ion grid method disclosed in, for example, JP-A-60-163316 or a device using a metal cooling piece as a barrier has been used. On the other hand, there are also known ones made of an insulating material including a barrier.

[Problems to be solved by the invention]

However, among the above-mentioned conventional examples, the one using a metal such as the one based on the deionized grid method has a direct current of 15
There is no particular problem when applied to a 00V class switch, but when used for a DC 3000V class switch, the number of barriers required for the arc ejection range is quite large. There is a problem that it becomes difficult to outfit the electric vehicle under floor because the overall size becomes large.

On the other hand, in the conventional example using the insulator barrier, there is a problem that the localized performance of the arc cannot be sufficiently obtained due to the characteristic that the barrier is an insulator, and the arc ejection range is wide so that the underfloor outfitting is difficult.

An object of the present invention is to solve the problems of these conventional examples, to improve the arc-extinguishing performance of the switch and to obtain a sufficient arc limit, and to provide an underfloor outfit for an electric car or the like. To provide an auxiliary arc extinguishing device.

[Means for solving problems]

According to the present invention, the above problem is solved by using, as a barrier for auxiliary arc extinguishing, a plate-shaped member made of a non-conductive material and a plate-shaped member made of a conductive material stacked on the upper surface of the plate-shaped member. It

[Action]

Due to the non-stickiness of the arc flow due to the non-conductive barrier and the stickiness of the arc flow due to the conductive barrier, the arc flow is retained and divided, and arc extinguishing performance and arc localization function are obtained at the same time. .

〔Example〕

Hereinafter, the auxiliary arc-extinguishing device for a switch according to the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 is an embodiment of the present invention, in which 1 is a primary arc shut of a switch, 2 is an auxiliary arc extinguishing chamber, 3a, 3
b and 3c are non-conductive barriers, 4 is a conductive barrier, and A ₁ , A ₂ , A ₃ , and A ₄ are arc flows, respectively.

The primary arc short 1 has a vertically elongated short shape when viewed from the left side in the figure, and the arc extinguishing chamber 2 is also made into a short frame shape in accordance with this.

Non-conductive barriers 3a, 3b, 3c (including all 3 below
Is crossed inside the arc-extinguishing chamber 2 and kept substantially parallel to each other, and deflects the arc flow A ₁ ejected from the primary arc shout 1 downward, and rainwater from the outside. It is mounted in the arc-extinguishing chamber 2 with an inclination so that it can be reduced as much as possible against the intrusion of the like. Among them, the uppermost barrier 3a and the lowermost barrier 3c are made of asbestos-based arc-resistant material known under the trade name of "Nitto Tight", for example, and the other barriers 3b are It is made of flame-retardant plate made of laminated material of glass cloth and melamine resin.

The conductive barrier 4 is made of a stainless steel plate, and its length in the direction along the arc flow A ₁ is made shorter than that of each of the non-conductive barriers 3. These non-conductive barriers 3 are mounted in contact with their upper surfaces in such a way that they are located approximately in the center so that they are approximately equal.

Next, the operation of this embodiment will be described.

When the switch provided inside shuts off the overcurrent, an arc is generated inside the primary arc sheath 1.

Although this arc is processed by the primary arc extinguishing action inside the primary arc shout 1, the unprocessed residue is ejected from the opening of the primary arc shout 1 as an arc flow A ₁ .

The arc flow A ₁ thus ejected first collides with the lower surfaces of the non-conductive barriers 3a, 3b, and thereby splits into the arc flows A ₂ and A ₃ .

Of these arc flows, first, the arc flow A ₂ is directed to the conductive barrier 4 located below, and then the arc flow A ₄ is made by using this barrier 4 as a pole. However, at this time, since the barrier 4 is conductive, a phenomenon in which the arc stays for a moment, that is, an arc sticking phenomenon occurs. As a result, an effect of suppressing the projection of the arc flow to the outside of the arc extinguishing chamber 2 can be obtained.

On the other hand, the arc flow A ₃ proceeds in a direction projecting to the outside. Therefore, the arc flow A ₃ tries to cross the above-described arc flow A ₄ at the position indicated by P in FIG.
₄ is given a bulge, and eventually this arc flow A ₄ is extended, and an arc extension action, which is one of the basic principles of the arc extinguishing action at the time of interruption, is given. Will be shortened. Further, at the same time, it is possible to prevent the arc flow A ₃ from directly projecting to the outside, so that the range of projection of the arc to the outside is narrowed,
The arc limiting function can be sufficiently given. The reduction of the arc duration obtained at this time could be easily achieved up to about 30% according to this example.

By the way, in this embodiment, the length of the conductive barrier 4 is made shorter than the length of the non-conductive barrier 3, and l and l'in FIG.
However, according to this embodiment, there is a difference in arc extinguishing performance depending on how these dimensions l and l'are determined.

First, the dimension l is reduced. In other words, if the width of the conductive barrier 4 is widened and extended to the left side in FIG. ₁ , it is difficult for the arc splitting to occur until the arc flow A ₁ collides with the non-conductive barrier 3. As the arc flow A ₂ facing 4 has many components, the arc flow A ₃ becomes relatively small, and as a result, the extension of the arc flow A _{4 at} the point P is not sufficiently obtained, and the re-ignition phenomenon occurs. It's easy to do.

This also applies to the dimension l ', and consequently, when these dimensions l and l'are kept equal to each other at a predetermined value, the maximum arc extinguishing performance is obtained under the dimension of the non-conductive barrier 3a at that time. It will be.

Next, a more specific embodiment of the present invention will be described with reference to FIG.

This implementation order is, as is clear from FIGS. 2 and 3, frame 5
Two auxiliary arc-extinguishing devices are attached to the hooks 8a and 8b of a switch box (not shown) by hooks 6 and fasteners 7.

FIG. 4 shows the structure of the mounting portions of the non-conductive barrier 3 and the conductive barrier 4. As shown in FIGS. 4 (a) and 4 (b), a groove 2a is formed on the inner surface of the side wall of the arc extinguishing chamber 2. Are formed, and both end portions of the non-conductive barrier 3 are inserted therein.

A protrusion 2d is formed on the inner surface of the side wall of the arc extinguishing chamber 2, and a groove 2b is further provided on the lower surface of the protrusion 2d and the upper surface of the groove 2a.

On the other hand, as shown in FIG. 4 (c), notched grooves 3d are provided at both end portions of the non-conductive barrier 3, whereas the conductive barrier formed in a substantially H shape is formed. The bent portions 4a of 4 are engaged. Further, the barrier 4 is formed with a bent portion 4b.

Therefore, when the barriers 3 and 4 are superposed and then, as shown in FIG. 4 (a), the barriers 3 and 4 are slid across the grooves 2a in the inner wall surface of the arc extinguishing chamber 2, the conductive property is improved. At the position where the bent portion 4b of the conductive barrier 4 reaches the groove 2b, the bent portion 4b engages with the groove 2b. On the other hand, if the non-conductive barrier 3 is excessively moved in the groove 2a in the inserting direction, Terminal portion 2c of 2a
As a result, the non-conductive barrier 3 and the conductive barrier 4 are fixed at a predetermined position inside the arc-extinguishing chamber 2.

At this time, the portion of the conductive barrier 4 where the bent portions 4a and 4b are formed is covered by the protruding portion 2d, and as a result, it is possible to reduce the risk of the arc contacting this portion. .

According to this embodiment, the arc extinguishing chamber 2 and each of the barriers 3 and 4 are formed separately, and the assembling to these arc extinguishing chambers 2 is made easy by utilizing the elasticity of the conductive barrier 4. Even if the barrier is locally damaged, only the damaged barrier can be replaced or moved easily.

Next, FIG. 5 shows still another embodiment of the present invention. The point of this embodiment is to form an ear portion 1a on the outer peripheral portion in the vicinity of the opening of the primary arc shout 1 and to correspond to this. The arc extinguishing chamber 2 is also provided with a protrusion 2e, and a packing material 9 made of synthetic rubber or the like having a U-shaped cross section is attached to the protrusion 2e. Only the ear 1a of the primary arc short 1 is packed with the packing material 9
It is pressed against the projecting portion 2e of the arc extinguishing chamber 2 via the to improve the airtightness in the tune of the primary arc sheath 1 and the arc extinguishing chamber 2, and from the outside of the arc extinguishing chamber 2 directly into the switch box 10. In addition to eliminating rainwater intrusion, the primary arc short 1
Vibration can be prevented.

〔The invention's effect〕

As described above, according to the present invention, it is possible to give a sufficient arc extinguishing performance in a small size and to eliminate re-ignition, so that the arc duration can be shortened and the arc region protruding from the arc extinguishing chamber can be suppressed. Therefore, it is possible to sufficiently deal with the problems of the prior art and easily obtain a switch suitable for underfloor outfitting of an electric vehicle of DC 3000V class.

Further, according to the present invention, it is possible to provide an embodiment in which the barriers can be easily replaced or replaced, and the maintenance cost can be easily reduced.

[Brief description of drawings]

1 is a sectional view showing an embodiment of an auxiliary arc extinguishing device for a switch according to the present invention, FIG. 2 is a front view showing another embodiment of the present invention, and FIG. 3 is a side view thereof. 4 (a) to 4 (c) are explanatory views showing a mounting state of the barrier, and FIG. 5 is a sectional view showing still another embodiment of the present invention. 1 ... primary arc short, 2 ... auxiliary arc extinguishing chamber, 3a-
3c ... Non-conductive barrier, 4 ... Conductive barrier, A ₁ ~
A ₄ ...... arc flow.

Claims (6)

[Claims] 1. An auxiliary arc-extinguishing device comprising a plurality of barriers for dividing an outlet of a primary arc chute in a vertical direction to divert an arc jetting direction downward, wherein each of the plurality of barriers comprises: A first plate-shaped member made of a non-conductive material, and a second plate-shaped member made of a conductive material attached so as to cover at least a part of the upper surface of the first plate-shaped member. An auxiliary arc extinguishing device for a switch, which is characterized in that 2. The method according to claim 1, wherein
So that the length of the plate-shaped member in the direction along the arc ejection direction is shorter than the length of the first plate-shaped member by a predetermined dimension, and the first plate-shaped member of the second plate-shaped member is An auxiliary arc extinguishing device for a switch, characterized in that the mounting position on the upper surface of the plate-shaped member is arranged so as to be substantially in the center of the first plate-shaped member. 3. The invention according to claim 1, wherein each of the plurality of barriers has its both ends inserted into grooves formed on the inner wall surfaces of the left and right wall members constituting the auxiliary arc-extinguishing device. An auxiliary arc extinguishing device for a switch, characterized in that it is assembled in a predetermined arrangement. 4. The structure according to claim 3, wherein the barriers are fixed to the left and right wall members by utilizing elasticity of the second plate member. An auxiliary arc extinguishing device for switches. 5. The second aspect of the present invention according to claim 4,
An auxiliary arc extinguishing device for a switch, characterized in that the vicinity of portions of the upper surface of the plate-shaped member which contact the inner wall surfaces of the left and right wall members are covered with a non-conductive member. 6. The auxiliary arc-extinguishing function of a switch according to claim 5, wherein the non-conductive member is formed by a protrusion formed on an inner wall surface of the left and right wall members. apparatus.