JP2569241Y2 - Circuit breaker - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention is relates to a circuit breaker.

[0002]

2. Description of the Related Art A conventional example is shown in FIGS. That is, this arc extinguishing device has a plurality of grid plates 70 stacked at predetermined intervals, and has exhaust holes 71 communicating with the gaps between the grid plates 70 on the back side in a staggered manner in the stacking direction of the grid plates 70. An arc-extinguishing grid 73 having a back plate 72 formed therein, and accommodating the arc-extinguishing grid 73 and entering between the exhaust holes 71 along the back plate 72 from one of the inner surfaces of the arc-extinguishing grid 73 on the back plate side. An arc-extinguishing chamber 76 having a bridging prevention projection 75 formed with a concave portion 74 at the distal end to escape the exhaust hole 71 is provided. 77 is a circuit breaker.

[0003]

However, in this arc extinguishing device, the bridging prevention protrusion 75 has a thin and long protrusion shape, so that the mechanical strength is weakened, and the mold forming is apt to be broken or broken. Was a problem in performance. Therefore, an object of the present invention is to provide an arc extinguishing device that can increase the mechanical strength of a bridging prevention projection and can prevent the bridging.

[0004]

[MEANS FOR SOLVING THE PROBLEMS]Circuit breaker
Has a plurality of grid plates stacked at predetermined intervals.
And communicates with the gap between the grid plates on the back side
Exhaust holes are formed in a zigzag pattern in the stacking direction of the grid plate.
Arc-extinguishing grid with a back plate
Store and inside the back plate side of the arc-extinguishing gridFace
RA bridging prevention protrusion that has entered between the exhaust holes along the back plate.
Arc extinguishing chamberTimes between body and cover
In road circuit breakers, Electrical part isolating the arc-extinguishing grid
A medium plate that can form a space for storing articles
And the bridging prevention protrusion is formed from both the body and the body.
Characterized byThings.

[0005] Claim 2Circuit breakerIs in claim 1
The opposite ends of the bridging prevention projections face each other.
It is something that meshes with. Claim 3Circuit breaker
The method according to claim 1, whereinOn the middle platePrevented bridging provided
The tips of the projections are interconnected by the connection
You.

[0006]

According to the circuit breaker of the first aspect, the arc which has entered the arc-extinguishing grid is divided by the plurality of grid plates to be extinguished, and the arc gas passes between the exhaust hole of the back plate and the bridging prevention projection. Exhausted from the arc extinguishing chamber. In this case, since the anti-bridging projections protrude from both the middle plate and the body, the height of the anti-bridging projections can be reduced to half of the conventional height, so that the mechanical strength can be increased and breakage during molding can be avoided. be able to. Also the positioning of the arc-extinguishing grid
Can be performed by the bridging prevention projections of the body and the middle plate.
Space for electrical components
Electrical parts such as auxiliary switches can be stored safely.

[0007] According to the circuit breaker of claim 2, according to claim 1 of the present invention.
In this case, the opposite ends of the bridging prevention projections mesh with each other, so that the bridging prevention effect can be improved in addition to the effect of the first aspect. According to the circuit breaker of claim 3, in claim 1, the distal end portions of the bridging prevention projections provided on the intermediate plate are connected to each other by a connecting portion, so that the operation of claim 1 is effected. In addition, the strength of the bridging prevention projections is improved, and the bridging prevention effect is more reliable and the performance stability is increased.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. That is, this circuit breaker is
There has a arc extinguishing grid 1, and the arcing chamber 2. The arc-extinguishing grid 1 includes a plurality of grid plates 3 stacked at predetermined intervals.
And a back plate 5 in which exhaust holes 4 communicating with the gaps between the grid plates 3 on the back side thereof are formed in a staggered manner in the laminating direction of the grid plates 3. Each grid plate 3 of the embodiment forms a notch 6 for arc entry. In addition, the back side of the laminated grid plate 3 is held by the U-shaped insulating plate 7,
The intermediate part is a back plate 5. In the embodiment, the exhaust hole 4 is a long hole having a length approximately half the width of the grid plate 3.

The arc-extinguishing chamber 2 accommodates the arc-extinguishing grid 1 and bridge prevention projections 8 which enter between the exhaust holes 4 along the back plate 5 from both inner surfaces of the arc-extinguishing grid 1 on the back plate 5 side. Having. The arc-extinguishing chamber 2 of the embodiment is provided at the bottom of the base 15 of the circuit breaker, and has a contact portion 10 in front of the arc-extinguishing grid 1 where an arc to be extinguished is generated. The base 15 is the body 16
And a cover 17, and a mechanism 11,
A current detector 12 and a terminal 13 are provided. An intermediate plate 18 is arranged on the cover 17 side of the arc-extinguishing chamber 2, and
1 is rotatably arranged by a shaft 19 provided on the
There is a space between the cover 17 and an electrical component such as an auxiliary switch. The bridging prevention projections 8 are formed on the facing surfaces of the middle plate 18 and the body 16, respectively. Reference numeral 14 denotes an exhaust hole of the arc extinguishing chamber 2 formed below the terminal 13.

According to this embodiment, the arc that has entered the arc-extinguishing grid 1 is divided by the plurality of grid plates 3 to be extinguished, and the arc gas flows between the exhaust hole 4 of the back plate 5 and the bridging prevention projection 8. The gas passes through the arc extinguishing chamber 2 and is exhausted to the outside. In this case, since the bridging prevention projections 8 protrude from both the middle plate 18 and the body 16, the height of the bridging prevention projections 8 can be reduced to half the conventional height, so that the mechanical strength can be increased.
It is also possible to avoid cracking and shaking during molding. In addition, arc extinguishing
Position the lid 1 by bridging the body 16 and the middle plate 18
This can be done by the prevention projection 8,
Auxiliary switch safely in the space for storing electrical components
It can store electrical components such as switches.

FIGS. 4 and 5 show a second embodiment of the present invention.
Shown in That is, in the arc extinguishing device, in the first embodiment, the opposite ends of the bridging prevention projections 8 mesh with each other. In this embodiment, the width of the anti-bridging projection 8 is determined so that the opposing bridging prevention projections 8 overlap each other by, for example, about several millimeters, and the tapered portion 20 is formed on the side of the tip.

According to this embodiment, since the tips of the bridging prevention projections 8 mesh with each other, the bridging prevention effect can be improved. Further, the bridging prevention projection 8 is easily engaged with the tapered portion 20. Otherwise, the configuration is the same as that of the first embodiment. FIGS. 6 and 7 show a third embodiment of the present invention. That is, in this arc extinguishing device, in the first embodiment, the distal ends of the bridging prevention projections 8 provided on one side surface of the arc extinguishing chamber 2 are connected to each other by the connecting portion 21.
In the embodiment, the height of the bridging prevention projection 8 on the middle plate 18 side is higher than the height of the bridging prevention projection 8 on the base 16 side. Further, similarly to the second embodiment, a tapered recess 22 is formed in the connecting portion 21 so that the tapered portion 20 of the bridging prevention projection 8 on the opposite side meshes, and the leading end is engaged.

In this embodiment, as in the second embodiment, the strength of the bridging prevention projection 8 is improved, and the bridging prevention effect is more reliable and the performance stability is increased. A fourth embodiment of the present invention is shown in FIGS. That is, the arc extinguishing device is different from the third embodiment in that the bridging prevention projection 8 of the middle plate 18 is provided.
It has a through hole 22 between them. The gap 23 between the middle plate 18 and the cover 17 communicates with the exhaust hole 14. By forming the through holes 22, a part of the arc gas can flow out into the gap 23 between the middle plate 18 and the cover 17, and as a result, the arc extinguishing space is enlarged and the breaking performance is improved. Further, the intermediate plate 18 having the bridging prevention projections 8 can be formed without requiring a side core.

[0014] A fifth embodiment of this invention in to FIG. 10 FIG. 17. That is, in this circuit breaker
However, the bridging prevention projection 8 on the body 16 side is provided between 4a and 4c and between 4e and 4g of the exhaust hole 4, and the bridging prevention projection 8 on the middle plate 18 side is provided on the 4b of the exhaust hole 4. And 4d and between 4f and 4h, and the tip is connected to the connecting portion 21.
Are linked by Others are the same as the fourth embodiment.

FIGS. 12 to 17 show details of the middle plate 18. FIG. 24 is a recess for mounting a switch such as an auxiliary switch;
Reference numerals 25 and 26 denote support shafts of an interlocking lever (not shown) between the auxiliary switch and the mechanism. Reference numeral 27 denotes a holding projection of the cover 17.
Reference numeral 8 denotes a shaft hole for rotatably supporting the middle plate 18.

[0016]

According to the circuit breaker of the first aspect, since the bridging prevention projection protrudes from both the middle plate and the body, the height of the bridging prevention projection can be reduced to half of that of the conventional one, so that mechanical breakage is achieved. The strength can be increased, and cracking during molding can be avoided. Also, position the arc extinguishing grid on the body and
And the anti-bridging projection on the middle plate.
To the space for storing electrical parts formed by the middle plate
It can store electric parts such as auxiliary switches.

According to the circuit breaker of claim 2, claim 1 is provided.
In this case, since the opposite ends of the bridging prevention projections mesh with each other, the bridging prevention effect can be improved in addition to the effect of the first aspect. According to the circuit breaker of claim 3, according to claim 1, the front end portions of the bridging prevention protrusions provided on the intermediate plate are connected to each other by a connecting portion. In addition, the strength of the bridging prevention projections is improved, and the bridging prevention effect is more reliable and the performance stability is increased.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a first embodiment of the present invention.

FIG. 2 is a partially cutaway side view thereof.

FIG. 3 is a partially cutaway front view thereof.

FIG. 4 is a partially cutaway side view of the second embodiment.

FIG. 5 is a partially cutaway front view thereof.

FIG. 6 is a partially cutaway side view of the third embodiment.

FIG. 7 is a partially cutaway front view thereof.

FIG. 8 is a partially cutaway side view of the fourth embodiment.

FIG. 9 is a partially cutaway front view thereof.

FIG. 10 is a schematic exploded perspective view of a fifth embodiment.

FIG. 11 is a partial front view thereof.

FIG. 12 is a front view of a middle plate.

FIG. 13 is a plan view thereof.

FIG. 14 is a sectional view taken along line CD of FIG. 12;

FIG. 15 is a rear view of the middle plate.

FIG. 16 is a sectional view taken along the line EF of FIG. 15;

17 is a sectional view taken along a line AB in FIG.

FIG. 18 is a partially cutaway side view of a conventional example.

FIG. 19 is a partially cutaway front view thereof.

FIG. 20 is a partial perspective view showing a bridging prevention projection.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Arc extinguishing grid 2 Arc extinguishing room 3 Grid plate 4 Exhaust hole 5 Back plate 8 Bridge prevention projection 18 Middle plate

Claims (3)

(57) [Scope of request for utility model registration] A back plate having a plurality of grid plates stacked at predetermined intervals and having exhaust holes communicating with gaps between the grid plates on the back side formed in a staggered manner in the stacking direction of the grid plates. and extinguishing grid having, a arcing chamber having a bridging prevention projection which enters between the exhaust holes along the back plate than the inner face of the back plate side of the arc extinguishing grid with housing the arc extinguishing grid Between body and cover
In the circuit breaker provided in the above, the arc extinguishing grid is isolated to form a space for storing electric parts.
A middle plate that can be formed,
Characterized in that the bridging prevention projection is formed from one side.
Road circuit breaker. 2. The circuit breaker according to claim 1, wherein the opposite ends of the bridging prevention projections mesh with each other.
Bowl . 3. The circuit breaker according to claim 1, wherein the front ends of the bridging prevention projections provided on the middle plate are connected to each other by a connecting portion.