JPS61256540A - Arc extinguisher - 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 Application of the Invention] Honmaruaki relates to arc extinguishing devices for circuit breakers, and in particular,
O Concerning an Arc Extinguishing Device Suitable for Improving Insulating Performance [Background of the Invention] As circuit free IT fins become smaller and the number of isolation chambers increases, maintenance of insulation performance and arc extinguishing performance as mentioned above has become a concern. Conventionally, regarding insulation performance, in the arc extinguishing chamber shape as shown in FIG. 13, as shown in FIG. The upper part of grid 2 prevents arc gas from adhering to the circuit breaker's mechanical parts, but no consideration was given to the deterioration of insulation performance from the sides of the arc extinguishing chamber. In this case, the cooling plate 7 shown in Fig. 15 is positioned as shown in Fig. 16 to cool the arc gas, lower the temperature and pressure inside the arc extinguishing chamber, and extinguish the arc. As shown in the figure, in the conventional cooling plate 7, there is a gap at the top and bottom, and arc gas passes through the gap, making it impossible to cool the cooling plate effectively. Also, Figures 13 and 15
In the case shown in the figure, which is equipped with an arc plate, the arc generated when the contact is opened is extended to the tip of the arc plate. Therefore, in the conventional arc extinguishing chamber, the exhausted arc gas is passed through the terminal screw to prevent short circuits between the phases. This point is not considered in the conventional example.

Note that arrow A in FIG. 16 indicates the flow of arc gas. As described above, the conventional devices had problems and were not able to satisfy both insulation and arc extinguishing requirements at the same time, which is why the present invention was created.

Incidentally, related to this yuzu device is, for example, Utility Model Publication No. 1982-23640.

[Purpose of the invention]

An object of the present invention is to provide an arc extinguishing device which can effectively cool arc gas without leakage and has excellent arc extinguishing performance and insulation performance.

[Summary of the invention]

The present invention allows Klf! to bend the fixed contact. In an arc extinguishing device comprising a U-shaped tear ion grid and a substantially U-shaped fixing member for fixing the tear ion grid, the center side of the U-shape of the fixing member is the middle part of the fixing member. An exhaust hole is pressed upward from above, and an arc gas shielding member is fixed to the lower blade of the exhaust hole so as to be in close contact with the center side of the U-shape. Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 42.

1 to 3 show a first embodiment of the present invention, and a side plate 1a,
It consists of i number of tear ion grids 2, a separator 3 located on the terminal side of a fixed frame 1 which is a fixed member formed in a U-shape and forms the center side of the U-shape, and a cooling plate 9 which is an arc gas shielding means. In a zero-circuit breaker, which is a cross-sectional view of an arc chute, when a short-circuit current flows, the movable contact and the fixed contact are separated from the contact state, but an arc is generated between these two contacts. As shown by arrow A in FIG. 1, this arc gas passes between the tear ion grids 2, passes through the exhaust holes 31 of the separator 3, and is discharged to the outside. In this embodiment, as shown in FIG. 1, there is no gap between the rear end of the tear ion grid 2 and the separator 3 so that the arc gas can pass through and be discharged to the outside.
A cooling plate 9 is provided as an arc gas shielding member. This cooling plate 9 has a shape as shown in FIG.
1°92, which are inserted into the notches 14 and 15 of the side plate 1 shown in FIG.
It is pressed and fixed. At this time, the protrusion 92 of the cooling plate 9
In FIG. 3, the shape between the bent portion 92 and the bent portion 93 is pressed from the shape of the dotted line indicating the reaction force release state to the shape of the solid line, so that the shape is The arc chute r (fixed) receives the force shown by the arrow BIC and is firmly fixed by its elastic force.Thereby, the arc gas at the time of short circuit interruption passes through the cooling plate 9 without leaking, is cooled, and the arc The arc is immediately extinguished and discharged from the exhaust hole 31 of the separator 3. Furthermore, the upper part 94 and inner part 95 of the cooling plate 9 are not exposed to arc gas, so that insulation resistance can be maintained. Overall, the amount of scum is cooled and reduced, the temperature is low, and the speed at which scum is discharged from the exhaust hole 31 is also slow.

Since the discharge range is narrow, there are problems during discharge, such as phase-to-phase short circuits,
It is possible to prevent damage to terminals and damage to other equipment and panels when attached to a switchboard, etc.In addition, the cooling plate 9 can be fixed by simply inserting it from the top of the arc chute, which is different from the conventional method. There is no need to take the trouble of spreading out the side plates and pushing them in, which makes the work easier. The second embodiment of the present invention is described in the fourth embodiment.
As shown in Fig. 5.

In this embodiment, as shown in FIG. 4, the cooling plate 1O, which is an arc gas shielding member, does not have a protrusion, but a side plate IK protrusion 11 of the arc chute is provided and fixed. In this example, on the side plate 1! Since arc gas is not required to leak through the groove, the insulation performance is further improved.

A third embodiment 1r of the present invention is shown in FIG. In this embodiment, the thickness t of the entire cooling plate, which is the arc gas shielding means, is unchanged, and the cooling plate 19 and 20 are used. Same as above. M4 Embodiment of the present invention - 0 shown in FIG. 7 In this embodiment, the lower part of the cooling plate 21, which is an arc gas shielding means inserted between the side plates, is formed into a U shape, and is brought into close contact with the separator 3. . According to this embodiment, it is possible to improve the ability to cut off unextinguished arcs and arc gas coming from the arc horn 18.

A fifth embodiment of If3 light is shown in FIGS. 8 to 1O.

In this embodiment, tear ion grids 22 and 23 as shown in FIGS. 8 and 9 are used to cool the arc gas without using a cooling plate. 1, the tear ion grid 23 is installed so as to be in close contact with the separator 3 and functions as an arc gas shielding means, whereby the arc horn 1
Since the arc drawn by 8 and the arc gas can be cooled down to the original metal, damage to the terminals due to the arc and arc gas can be prevented. The sixth embodiment of the present invention is the first embodiment.
Shown in Figure 1. This embodiment uses cooling plates 24 and 25, which are arc gas shielding means, to create a large nitrogen gap. According to non-implemented examples, not only did the area of the cooling plate increase;
Figure 12 shows an example of the 7th disaster of Meiji Okito, where the cooling effect can be increased by creating a cooling system. This embodiment is obtained by adding a cooling plate 7 shown in FIG. 15 to the arc extinguishing device of the sixth embodiment. According to this embodiment, the cooling effect can be further improved.

In the above embodiment, it is preferable that the fixed frame 1 is made of the side plate 1a and the separator 3 integrally, but the fixed frame 1 may be made into a U-shape by assembling separate pieces without any gaps.

〔Effect of the invention〕

According to the present invention, it is possible to obtain an arc extinguishing device that can eliminate arc gas leakage, effectively cool the arc gas, and has excellent arc extinguishing performance and insulation performance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an arc extinguishing device in a first embodiment of the present invention, FIG. 2 is a perspective view of a cooling plate in the first embodiment of the present invention, and FIG. 3 shows the direction of force applied to the cooling plate 3. A diagram showing the location,
FIG. 4 is a sectional view of an arc extinguishing device according to a second embodiment of the present invention, and FIG. 5 is a sectional view of an arc extinguishing device according to a second embodiment of the present invention. FIG. 6 is a plan view of the arc extinguishing device in llK, FIG. 6 is an I#T view showing the fixed state of the arc gas shielding member of the arc extinguishing device in the third embodiment of the present invention, and FIG. 7 is a fourth embodiment of the present invention. A cross-sectional view of the arc extinguishing device in
8 and 9 are perspective views of a de-ion grid and an arc gas shielding member used in arc extinguishing devices according to fifth to seventh embodiments of the present invention, respectively, and FIG. 10 is a perspective view of a fifth embodiment of the present invention. 11 is a sectional view of an arc extinguishing device in a sixth embodiment of the present invention, FIG. 12 is a sectional view of an arc extinguishing device in a seventh embodiment of the present invention, and FIG. 13 is a sectional view of an arc extinguishing device in a seventh embodiment of the present invention.
14 is a perspective view of a conventional arc extinguishing device, FIG. 15 is a perspective view of a conventional cooling plate, and FIG. FIG. 16 is a sectional view of a conventional arc extinguishing device equipped with the cooling plate shown in FIG. 15. : Fixed contact, 9.10,1
9, 21. 23. 24: Arc gas shielding member, 31: Exhaust hole thatch 6 Figure # 7 Leap year 13 times

Claims (1)

[Claims] An arc extinguishing device comprising a tear ion grid formed in a substantially U-shape surrounding a fixed contact, and a fixing member formed in a substantially U-shape and fixing the tear ion grid,
An exhaust hole is formed in the central side of the U-shape of the fixed member from the middle part upward, and an arc gas shielding member is fixed below the exhaust hole so as to be in close contact with the central side of the U-shape. An arc extinguishing device characterized by comprising: