JPS6224924Y2 - - Google Patents

Description

[Detailed description of the invention] This invention produces a gas flow between a movable arc contact and a nozzle, and blows gas onto the arc to extinguish the arc. It concerns an improved structure.

The puffer type arc extinguishing chamber uses the puffer principle to increase the pressure inside the puffer cylinder, and that pressure creates a gas flow between the movable arc contact and the nozzle.
This device extinguishes the arc that occurs between the movable arc contact and the fixed arc contact when the current is interrupted by blowing gas onto it.

FIG. 1 shows a conventional arc extinguishing chamber of this type. In Fig. 1, 1 is a piston, 2 is a puffer cylinder,
3 is a nozzle, 4 is a guide, 5 is a movable main contact, 6
is a movable arc contact, 7 is a fixed main contact, 8 is a fixed arc contact, 9 is an electric arc, and 10 is a gas flow, which is directed from the outer periphery of the movable arc contact 6 to the tip by the nozzle 3. Once guided. 11
indicates rod.

In such a device, when the breaker is closed, the movable main contact 5 and the fixed main contact 7 come into contact and are energized. When the current is then cut off, the rod 11 is operated by an operating mechanism (not shown), and the gas in the puffer cylinder 2 is compressed by the piston 1, producing a gas flow 10. In addition, the main contactor 5,
The current flowing between the movable arc contact 6 and the fixed arc contact 8 is commutated to the movable arc contact 6 and the fixed arc contact 8 because the main contact breaks contact earlier than the arc contact. Then, when both arc contacts 6 and 8 are separated,
An arc 9 is generated between the movable arc contact 6 and the fixed arc contact 8, and this arc 9 is blown by the gas flow 10.

FIG. 2 shows an enlarged view of the vicinity of a movable arc contactor in a conventional arc extinguishing chamber. A guide 4 is attached to the outside of the movable arc contactor 6, and a gas flow 10 is guiding. The movable arc contact 6 is divided in the circumferential direction, each having elasticity, in order to obtain contact pressure in the radial direction when it comes into contact with the outer periphery of the fixed arc contact 8. Therefore, this divided movable arc contactor 6
Since there is a gap in the guide 4, the gas flow 10 would leak through the gap and would not be able to effectively spray the arc 9. Further, the movable arc contactor 6 and the guide 4 are provided with claws 6a and 4a, respectively, and engagement of these claws prevents the movable arc contactor 6 from being deformed inward by electromagnetic force.

By the way, when the tip of the movable arc contact 6 is heated by the arc 9, metal vapor is generated at the tip. However, in this conventional structure, the tip of the movable arc contact 6 is covered with the guide 4 on its outer periphery. It is difficult to obtain a good cooling effect. Therefore,
A large amount of metal vapor is generated, which is thought to have a negative effect on the shearing performance.

Further, since the guide 4 is provided on the outer periphery of the movable arc contactor 6, the flow path of the gas flow 10 is narrowed, resulting in a drawback that an effective gas flow cannot be obtained.

This idea was made in view of the above-mentioned shortcomings, and it is possible to obtain good breaking performance by effectively cooling the tip of the movable arc contactor, and also to effectively cool the tip of the movable arc contactor. The purpose is to obtain a cutter that can be sprayed with water. An embodiment of this invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 shows a sectional view of the arc extinguishing chamber according to this invention, in which a cylindrical guide 12 is disposed inside the movable arc contactor 6. The gas flow 10 is then flowed between the nozzle 3 and the movable arc contactor 6, and no member is interposed therebetween.

FIG. 4 is an enlarged view of the vicinity of the movable arc contact 6 of this invention. When inserted, its elasticity provides contact pressure in the radial direction. The gas is guided by the nozzle 3, the movable arc contact 6, and the guide 12, and the guide 12 prevents gas from leaking from the slit 6b of the movable arc contact 6. Note that the guide 12 also has the effect of preventing the movable arc contactor 6 from bending inward due to electromagnetic force.

As described above, this invention has the following advantages.

(a) The tip of the movable arc contactor 6 is directly cooled by the gas flow 10, and less metal vapor is generated from the movable arc contactor 6, resulting in good breaking and breaking performance.

(b) Since there are no inclusions between the nozzle and the movable arc contact, a large gas flow path can be obtained.

(c) As a countermeasure against electromagnetic force, the guide and movable arc contact do not require engaging claws as in the past, resulting in a simple structure.

(d) The structure of the guide is simple and lightweight, making it suitable for high-speed cutting.

In the above embodiment, a self-supporting type contactor which has a spring effect due to cantilever burrs in a shape where the movable arc contactor 6 is divided in the circumferential direction was described. Similar effects can be achieved with external force type contacts such as those obtained.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional arc breaker arc extinguishing chamber.
FIG. 2 is an enlarged sectional view of the vicinity of a conventional movable arc contactor. Figure 3 is a sectional view of an arc extinguishing chamber showing an embodiment of this invention, and Figure 4 is an enlarged view of the vicinity of the movable arc contactor of this invention, where a is a side view and b is a.
It is an AA sectional view of. In the figure, 1 is a piston, 2 is a puffer cylinder,
3 is a nozzle, 6 is a movable arc contact, 8 is a fixed arc contact, 9 is an arc, 10 is a gas flow, 11 is a rod, and 12 is a guide. Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] The movable arc contact includes a fixed arc contact, a movable arc contact that contacts the outer periphery of the fixed arc contact, and a nozzle that guides a gas flow from the outer periphery of the movable arc contact toward the tip, and the movable arc contact is arranged in the direction of the gas flow. In a puffer type or disconnector having a slit, having elasticity in the radial direction, and blowing the gas onto the arc to extinguish the arc, a cylindrical guide is provided inside the movable arc contactor, and this A shingle breaker characterized in that no other member is interposed between the outside near the tip of the movable arc contactor and the nozzle.