JP2557151Y2 - Circuit breaker - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to arc gas discharge of a circuit breaker.

[0002]

2. Description of the Related Art A conventional circuit breaker of this type is shown in FIGS.
The air circuit breaker shown in FIG. 3 is a longitudinal sectional side view of a main part, FIG. 4 is a perspective view showing an arc extinguishing device part of FIG. 3, and FIG. 5 is a sectional view taken along line VV of FIG. In the figure, 1 is a mold base, 2 is a mold cover, 3 and 4 are a pair of conductors constituting a part of a current-carrying part, 5 is a fixed contact fixed to one conductor 3, and 6 is a contact and separation with the fixed contact 5. Movable contacts, 7
Is a mover to which the movable contact 6 is fixed, 8 is a shunt for connecting the end of the mover 7 to the other conductor 4, and 9 is a mover 7
Is connected to a contact opening / closing mechanism (not shown) via an insulating link 11 by a pin 10. Reference numeral 12 denotes a contact pressure spring, and 13 denotes an arc extinguishing device fixed to or detachable from the mold base 1 in a unit system. A pair of side supporting plates 13a and a plurality of arc extinguishing devices arranged at intervals therebetween. It consists of a plate 13b. 1
Reference numeral 4 denotes an exhaust plate mounted on the exhaust side of the arc extinguishing device 13 or attached to the mold base 1, and has an exhaust port 14a for arc gas. 15 is exhaust from the arc extinguishing device 13
The side support plate 1 is provided between each arc-extinguishing plate 13b and the exhaust plate 14 so as to block a linear exhaust passage leading to the opening 14a.
Arc gas shielding plate supported between 3a , arc gas is
The exhaust path bypassing the outside of this plate edge makes a large detour
And is discharged from the exhaust port 14a. Reference numeral 16 denotes a ground metal plate such as a switchboard or distribution board, and 17 denotes an arc space.

The opening / closing operation of the circuit breaker is transmitted from the contact opening / closing mechanism to the pin 10, and the contact arm 9 and the movable element 7 are operated to open / close the two contacts 5, 6. The arc gas between the contacts (high-temperature conductive gas) at that time is extinguished in the arc extinguishing device 13 and then the arc gas shielding plate 1 as shown by the arrow in FIG.
5, the outside is largely detoured and the exhaust port 14a
Is discharged from The configuration of the air circuit breaker, the opening and closing operation, and the configuration in which the arc extinguishing device 13 is unitized are described in, for example, Japanese Patent Application No. 1-334441.

[0004]

In a conventional circuit breaker, an exhaust plate 14 is provided to prevent disorderly ejection of arc gas to prevent a ground fault to the ground metal plate 16, but the size of the panel is increased. However, there is a problem that the arc space 17 cannot be made large because it leads to an increase in cost, and the arc gas squeezed out from the exhaust port 14a is grounded to the ground metal plate 16 because of this.

The present invention has been made to solve such a problem, and a cooling plate is combined with an arc gas shielding plate.
It is an object of the present invention to provide a circuit breaker that can prevent a ground fault due to arc gas to a grounded metal plate in a smaller arc space with a simple means of providing the circuit breaker.

[0006]

The circuit breaker according to the present invention includes an arc gas shielding plate and a cooling plate having a large number of cooling holes between the arc gas shielding plate and the exhaust plate. is there.

[0007]

[Action] In this invention, the arc gas which is arc extinguishing in the arc-extinguishing device is caused to increase <br/> bypass outside the arc gas shield plate, through the cooling hole of the cooling plate before being discharged from the exhaust port Therefore, when the arc gas is cooled by bypass,
Is discharged from the exhaust port is cooling when further passing through the cooling holes.

[0008]

An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal side view of an arc extinguishing device, and FIG.
5 is a perspective view showing a cooling plate of the related art, and the same or corresponding portions as those of the conventional cooling plate are denoted by the same reference numerals and description thereof is omitted. In the drawing, reference numeral 18 denotes an exhaust plate 14 so as to close the exhaust port 14a.
A cooling plate (metal plate) disposed between the cooling gas and the arc gas shielding plate 15, and has a large number of cooling holes 18a. The cooling plate 18 is larger than the exhaust port 14a and has a plurality of feet 18b.
Is positioned and fixed by being sandwiched between the two plates 14 and 15.

When the arc gas shielding plate 15 and the cooling plate 18 are provided between the exhaust plate 14 and the arc extinguishing plate 13b, the arc gas extinguished in the arc extinguishing device 13 is discharged from the exhaust port 14a. Before being discharged, as shown by an arrow in FIG. 1, the arc gas shielding plate 15 largely detours the outside thereof and then passes through the cooling holes 18 a of the cooling plate 18 .
Kugasu is cooled to be et when passing through the cooling holes 18a while being cooled by the bypass. Therefore, the arc space can be reduced.

[0010]

As described above, according to the present invention, a simple means of providing a cooling plate in combination with an arc gas shielding plate has an effect that a ground fault due to arc gas to a grounded metal plate can be prevented in a smaller arc space. can get.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a cooling plate of FIG. 1;

FIG. 3 is a vertical sectional side view of a main part showing a conventional one.

FIG. 4 is a perspective view showing an arc extinguishing device of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

[Explanation of symbols]

 5 Fixed Contact 6 Movable Contact 13 Arc Extinguishing Device 13a Side Support Plate 13b Arc Extinguishing Plate 14 Exhaust Plate 14a Exhaust Port 15 Arc Gas Shielding Plate 18 Cooling Plate 18a Cooling Hole

Claims (1)

(57) [Scope of request for utility model registration] At least one pair of opening / closing contacts, a plurality of arc-extinguishing plates are held at intervals between a pair of side support plates, and are arranged to face the opening / closing contacts so that a current is cut off. An arc extinguishing device for extinguishing an arc generated between the switching contacts,
Exhaust plate having an exhaust port of the arc gas with is arranged on the opposite side to the opening and closing contacts of the arc extinguishing device, and the
The straight exhaust passage leading from the arc extinguishing device to the exhaust port is blocked.
Provided between each arc extinguishing plate and the exhaust plate so as to cut off
The arc gas is exhausted by the exhaust passage bypassing the outside of the plate edge.
A circuit breaker having an arc gas shielding plate to be bypassed , wherein a cooling plate having a large number of cooling holes is disposed between the arc gas shielding plate and the exhaust plate so as to close the exhaust port. Circuit breaker.