JPH08306273A - Arc-extinguishing device for circuit-breaker - Google Patents

Abstract

PURPOSE: To facilitate the assembling of a device with the simple structure, and to improve the assembling workability in an arc-extinguishing device for circuit-breaker to be arranged in the periphery of a contact of a circuit-breaker, which extinguishes the arc generated at the time of opening with the magnetic blow-out method. CONSTITUTION: A coil 31 of a driving coil 3 to be fitted to the peripheral part of a fixed contact 102 is formed of as flat square conductive wire, which is coated for insulation and which has a nearly rectangular cross section. This flat square conductive wire is wound in one layer in the condition that the vertical width side surfaces of the longitudinal direction are tightly adhered to each other so as to cope with the stress of the electromagnetic force generated in the driving coil 3 in the vertical width of the longitudinal direction and so as to push for support each side surface of the flat square conductive wire in the lateral width of the short dimension, and a device is securely formed with the simple structure. Since the flat square conductive wire is wound in one layer, number of part items is restricted at the minimum so as to improve the assembling workability at the time of manufacture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker arc extinguishing device arranged around the contactor of a circuit breaker, and more particularly to a circuit breaker for extinguishing an arc generated when the contacts are separated from each other by a magnetic blowout method. Arc extinguishing device.

[0002]

2. Description of the Related Art Conventionally, there have been arc-extinguishing devices for circuit breakers of this type as shown in FIGS. FIG. 5 is a detailed cross-sectional view of a conventional arc extinguishing device for a circuit breaker, and FIG. 6 is an assembly state explanatory diagram of the arc extinguishing device shown in FIG. In each of the drawings, the arc extinguishing device of the circuit breaker is formed in a substantially cylindrical shape, and the arc runner 1 for moving the arc discharge position from the inner surface of the cylindrical shape.
0, a coil bobbin 2 that supports the arc runner 10 at the tip of the cylindrical shape, a drive coil 30 that is disposed on the outer circumference of the coil bobbin 2 in the cylindrical shape, and has a cylindrical body having an insulating property. And an insulating portion 4 for supporting the coil bobbin 2 at an end portion of the cylindrical body, and a cylindrical flange main body 51 in which a female screw 54 is formed inside, and the insulating portion 4 is provided at an end portion of the flange main body 51. And a flange mounting portion 50 for supporting the.

The arc runner 10 has a funnel-shaped runner main body 13 that expands from the intermediate portion of the inner surface of the cylindrical shape toward the front side, and a flange portion formed so as to project to the outer periphery of the runner main body 13. 13a and the runner attachment screw 12 which adheres to the coil bobbin 2 located in the back. The coil bobbin 2 is formed of a bobbin main body 21 formed of a hollow cylindrical body and a stepped portion having a hook-shaped cross section on the outer periphery of the bobbin main body 21, and a storage portion 22 for storing the drive coil 30 in the stepped portion. And a configuration including.

The drive coil 30 is disposed in close contact with a concave portion formed by the accommodating portion 22 and the flange portion 13a of the runner body 13, and is made of an insulating material such as resin and has a substantially L-shaped cross section. Member 32a formed as
A winding 34 formed by winding a round copper wire having a circular cross section into three layers in a, and an outer tube 3 wound around the outer circumference of the winding 34.
5, and the epoxy resin (not shown) is filled between the round copper wires of the winding 34 and fixed. The winding 34 is constructed by interposing an insulating sheet (not shown) between the round copper wires laminated in three layers.

Next, the operation of mounting and assembling the conventional arc-extinguishing device for a circuit breaker based on the above-described structure in the fixed contact portion will be described. First, regarding the assembling operation of the arc extinguishing device of the circuit breaker, the insulating portion 4 is attached to the flange attaching portion 50 by the attaching screw 56, and the bobbin main body 21 is attached to the insulating portion 4.
Is attached by screwing the insulating mounting screw 42. The protective member 32a is attached to the accommodating portion 22 of the bobbin main body 21 thus attached, and in this state, a round copper wire is wound and an insulating sheet (not shown) is interposed for each layer to form a three-layer winding 34. Then, the outer tube 35 is attached from the outside of the wound round copper wire, and epoxy resin or the like is further filled. Further, the arc runner 10 is attached to the bobbin main body 21 of the coil bobbin 2 from the side of the drive coil 30 by screwing the runner attaching screw 12 to complete the assembling of the arc extinguishing device of the circuit breaker.

To assemble the completed arc-extinguishing device of the circuit breaker to the fixed contact portion 100, the fixed contact portion 1 is a prerequisite.
00 penetrates the side wall of the case main body 400 and is screwed to the power supply conductor of the power supply side bushing 300 which is attached in a hermetically sealed state. The fixed contact portion 100 has a male screw 101 on the outer circumference of the base portion.
The fixed contactor 102 is attached to the mounting base portion projecting from this base portion by an elastic force such that the fixed contactor 102 contracts inward by the garter spring 103. A nut 55 is screwed onto the male screw 101 of the fixed contact portion 100, and the flange mounting portion 50 is attached to the male screw 101.
This is done by screwing the female screw 54 of. By double screwing the nut 55 and the female screw 54 of the flange mounting portion 50 onto the male screw 101, the male screw 1 can be mounted similarly to the double nut fixing.
The screw thread No. 01 and the screw thread of the male screw 54 are in close contact with each other, and by this mutual close contact, the contact is made completely and the current conduction portion for magnetic blowout is also provided.

[0007]

Since the conventional arc-extinguishing system of the circuit breaker is constructed as described above, the arc runner 10 is attached to the fixed contact 102 of the fixed contact portion 100 by the nut 55 and the flange. Female screw 5 of section 50
Since it has to be adjusted depending on the screwed state with 4, the precise positioning is difficult. That is, these mounting operations must be performed in an extremely narrow space of the case main body 400 having an opening only on one side and the other front surface being closed, and the nut 55 and the female screw 54 of the flange mounting portion 50. Adjusting the screwing state of both the and the workability was extremely deteriorated.

Further, since the drive coil 30 is formed by the winding 34 having three layers of round copper wire, the fixation by the epoxy resin can counter the large stress due to the electromagnetic force generated in the winding 34. However, there is a problem that the winding state of each round copper wire of the winding 34 is disturbed.

Further, when the outer tube 35 is mounted from the outside of the winding 34 as in the conventional device in order to prevent the winding state from being disturbed, the epoxy resin inside the outer tube 35 is mounted. Is not sufficiently filled, and the drying time is required to be long, and the outer dimensions are increased in order to sufficiently fill the epoxy resin.
Further, the number of parts to be mounted is increased and the number of work steps is also increased. In particular, the winding 34
In the case of a structure in which the layers are wound, a potential difference due to a voltage drop occurs between layers, causing insulation breakdown between layers, so an insulating sheet or the like must be interposed between layers, further increasing the manufacturing process. There is a problem of causing it. The present invention has been made to solve the above problems, and an object of the present invention is to provide an arc extinguishing device for a circuit breaker, which has a simple structure, facilitates assembly, and improves assembly work.

[0010]

An arc-extinguishing device for a circuit breaker according to the present invention is a circuit breaker for opening and closing an electric line, and one of two contactors of the circuit breaker. The drive coil is fixed to the base part of the contactor, the drive coil is mounted so as to surround the outer peripheral part of the contactor, and the arc runner formed of a conductive material is arranged inside the drive coil to connect the two contacts. In a circuit breaker arc extinguishing device that extinguishes an arc generated when a child is opened by moving on an arc runner in a direction orthogonal to a magnetic field generated in the drive coil, the drive coil is a flat rectangular cross section with an insulating coating. A copper wire is formed by winding it in a single layer so that the longitudinal side faces of the long dimension are in close contact with each other, and the end of the rectangular copper wire on one end side of the drive coil is connected to the base part of the one contactor. The flat copper wire on the other end It is intended to be connected to the arc runner.

In the arc-extinguishing device of the circuit breaker according to the present invention, if necessary, the drive coil is arranged such that the tip portion of the one contact is located between the center portion of the coil winding and the inner end portion thereof. Is to be installed in.

An arc-extinguishing device for a circuit breaker according to the present invention is a circuit breaker for opening and closing an electric line, and a base portion of one of the two contactors of the circuit breaker, In an arc extinguishing device of a circuit breaker, which arranges an arc runner formed of a conductive material so as to surround an outer peripheral portion of the one contactor,
The base side screw thread of the base part of the one contactor is formed, and the one contactor is arranged with reference to the side end step part of the base side screw thread, and the arc runner mounting side A mounting side screw thread is formed on the end portion, and a positioning protrusion is formed on the inner side of the mounting side screw thread, and the base side screw thread and the mounting screw thread are screwed together to form the side end step portion. It is tightened until the positioning protrusion contacts.

In the arc-extinguishing device of the circuit breaker according to the present invention, the base portion of one contact is made of a conductive material, and the base-side screw thread and the mounting-side screw thread are screwed together if necessary. The current flowing through one contact is supplied to the arc runner side.

[0014]

In the present invention, the drive coil attached to the outer peripheral portion of one contact is formed of an insulating coated rectangular copper wire having a substantially rectangular cross section, and this rectangular copper wire has a long vertical width. By forming it by winding it in one layer so that the side surfaces are in close contact with each other, the stress of the electromagnetic force generated in the drive coil can be accommodated by the long dimension in the vertical direction, and the lateral width of the short dimension can accommodate the mutual sides of the rectangular copper wire. Since it is supported by, it can be robustly formed with a simple structure. Further, since the rectangular copper wire is formed by being wound in a single layer, the number of parts is reduced as much as possible, fixing by epoxy resin is not required, and the assembling workability in manufacturing is improved.

Further, in the present invention, the two contactors are opened by disposing the one contactor so that the tip end portion thereof is located between the center portion of the substantially horizontal width of the coil winding and the inner end portion. In this case, the arc generated at the time of can be smoothly transferred from the one contact to the arc runner side, and the arc extinguishing operation can be performed more reliably.

Further, in the present invention, one contact portion is arranged with reference to the side end stepped portion of the base side screw thread, and the positioning protrusion contacting the side end stepped portion is provided at the back of the mounting side screw thread. Since it is formed on the side, the mounting side screw thread is simply screwed into the base side screw thread and tightened until the positioning protrusion comes into contact with the side end step portion. It is possible to position and attach the positional relationship of with high accuracy and simply.

Further, in the present invention, since the base portion of one contact is made of a conductive material, each screw is tightened by screwing the base side screw thread and the mounting side screw thread. The peaks come into contact with each other, and can also serve as a current-carrying portion to the arc runner side.

[0018]

【Example】

(One Embodiment of the Present Invention) An arc extinguishing device for a circuit breaker according to one embodiment of the present invention will be described below with reference to FIGS.
1 is a detailed cross-sectional view of the circuit breaker arc extinguishing device according to the present embodiment, FIG. 2 is an explanatory view of an assembled state of the circuit breaker arc extinguishing device, and FIG. 3 is a circuit diagram of FIG. 4 is a side view of the arc extinguishing device for a circuit breaker after assembly according to FIG. 2, and FIG.

In each of the drawings, the arc-extinguishing device for a circuit breaker according to this embodiment is common to the arc-extinguishing device for a conventional circuit breaker shown in FIG. 5, and corresponds to the arc runner 1 (reference numeral 10 in FIG. 5). ), The coil bobbin 2, the drive coil 3 (corresponding to reference numeral 30 in FIG. 5), the insulating portion 4, and the flange mounting portion 5 (corresponding to reference numeral 50 in FIG. 5), and these are similarly assembled and configured. The arc runner 1, the drive coil 3, and the flange mounting portion 5 have different structures.

The arc runner 1 is a runner main body 11 formed into an orifice shape by curving the cylindrical inner surface made of a conductive material so as to have a curve slightly distant from the intermediate portion.
And a runner mounting screw 12 for fixing the runner body 11 to the coil bobbin 2. The drive coil 3 is disposed in close contact with a concave portion formed by the housing portion 22 of the coil bobbin 2 and the collar portion 11a of the runner body 11, and is made of an insulating material such as resin and has a substantially L-shaped cross section, and is formed as a toroid. A protective member 32 to be formed, a winding 31 formed by winding a flat rectangular copper wire having a rectangular cross section formed on the surface of the protective member 32, and a winding 31 formed on the winding 31. The adhesive tape 33 to be rotated is provided. This winding 3
1, a rectangular copper wire having a vertical width L01 and a horizontal width L02 (L02 <L01) different from each other is used, and the vertical side surfaces are closely attached to each other and wound around the protective member 32. To be done.

The flange mounting portion 5 has a flange body 51 formed of a cylindrical body, and the flange body 51.
Female screw 5 formed with a width of length L42 from one side end to the inside
2 and the length L from the other end of the flange body 51 to the inside
A positioning protrusion 53 protruding like a hook at the position 41, and a collar 53 protruding laterally around the outside of the positioning protrusion 53.
a, and an insulating portion mounting screw 56 for inserting the insulating portion 4 by being inserted into the mounting hole of the collar portion 53a. A groove 52a having a concave cross section is formed between the flange main body 51 and the positioning protrusion 53.

The runner body 11 of the arc runner 1 has a length L11, and the bobbin body 21 of the coil bobbin 2 has a width L12. This runner body 1
1 and the bobbin body 21 are assembled in the same length as the runner body 1
It is a dimension (L12 + L1S) obtained as a value obtained by adding the length L1S of the width of the first collar portion 11a to the length L12 of the bobbin main body 21. Also, the width of the insulating body 41 of the insulating portion 4 is L1.
3, the width of the flange body 51 of the flange mounting portion 5 is L1
The total length of the arc-extinguishing device of the circuit breaker according to the present embodiment, which is formed by 4, is the dimension (L12 + L1S + L13 + L14).

Further, the distance L1 from the inner end of the positioning protrusion 53 of the flange mounting portion 5 to the inner end of the runner body 11 of the arc runner 1 is the arc runner 1
And the deviation length of the coil bobbin 2 (L12 + L1S-L11)
And the length L13 of the insulator main body 41 and the length L41 of the flange main body 51, the dimension {(L12 + L1S-L1
1) + L13 + L41}.

Next, the assembling operation of the arc extinguishing device for the circuit breaker according to the present embodiment based on the above-mentioned structure and the operation for assembling the fixed contact portion after the assembling will be described. First, regarding the assembling operation of the arc extinguishing device of the circuit breaker, the insulating part 4 is attached to the flange mounting part 5 by the insulating part mounting screw 56 as in the conventional device shown in FIGS. The bobbin body 21 is attached by screwing the insulation mounting screw 42. A protective member 32 having a substantially U-shaped cross section is attached to the accommodating portion 22 of the attached bobbin main body 21, and a rectangular conductor is wound around the protective member 32 so that side surfaces in the long vertical width direction are in close contact with each other. Turn to form the winding 31. This winding 3
By winding the adhesive tape 33 so as to be laminated on the upper layer of 1, the whole is protected and fixed. This wound winding 31
Has one end connected to the flange body 51 formed of a conductive material, and the other end formed of a conductive material.
Connected to.

As described above, since the vertical side surfaces of the winding 31 having a large width L01 are wound in a state in which they are in close contact with each other, the inside of the winding 31 is orthogonal to the paper surface as shown in FIG. When an electric current flows in the direction of, electromagnetic forces F1 and F2 are generated, and the stress of the electromagnetic forces F1 and F2 can be dealt with. That is, also in the horizontal direction of the small width L02 of the winding 31, the side surfaces of the vertical width L01 are arranged in close contact with each other, and are pressed between the collar portion 11a and the bobbin main body 21. It has a sufficiently large stress characteristic. Further, by winding the winding 31 so that the small width L02 is in the horizontal direction, the number of windings can be increased.

Further, the drive coil 3 is attached to the coil bobbin 2 attached to the flange attaching portion 5 and the insulating portion 4, and the arc runner 1 is attached from the front side of the drive coil 3.
Is integrally mounted by screwing the runner mounting screw 12 to complete the assembly of the arc extinguishing device of the circuit breaker. The operation of assembling the completed arc-extinguishing device of the circuit breaker to the fixed contact portion 100 is performed by screwing the male screw 101 of the fixed contact portion 100 so that the positioning protrusion 53 of the flange mounting portion 5 is completely abutted. Make a match. In this way, the positioning protrusion 53 is screwed into the side end step 101a of the male screw 101 until it comes into contact with the arc-resistant contact of the fixed contact 102 of the fixed contact 100 and the runner body 11 of the arc runner 1. Precise positioning with respect to the orifice shape can be performed only by rotating the screwing operation. That is, the arrangement position of the fixed contact portion 100 with respect to the fixed contact 102 is set to the side end step portion 101 of the male screw 101.
The distance L1 from the inner end of the positioning projection 53 of the flange mounting portion 5 to the inner end of the runner body 1 of the arc runner 1 is designed and manufactured with the arrangement distance L2 as a reference. = {(L12 + L1S-L11)
+ L13 + L41}, the highly accurate assembly of the circuit breaker arc extinguishing device of this embodiment to the fixed contact portion 100 can be simply and easily performed.

Further, the side end step portion 101 of the male screw 101
Since a is screwed so as to be completely tightened until it comes into contact with the positioning protrusion 53 of the flange mounting portion 5, the respective screw threads of the male screw 101 and the female screw 52 formed of a conductive material are respectively formed. Since they come into close contact with each other, they also serve as a current conducting surface to the drive coil 3 for magnetically erasing.

(Other Embodiments of the Present Invention) The drive coil 3 of the arc-extinguishing device for a circuit breaker according to this embodiment has the fixed contact 102 of the fixed contact portion 100 substantially at the center of the winding of the rectangular copper wire.
It is also possible to adopt a configuration in which the tip of is placed. By arranging in this manner, the fixed contact 102
On the other hand, the arc generated when the movable contact 201 is opened can be smoothly transferred to the arc runner 1 side.

Although the rectangular copper wire is wound in a single layer, it may be wound in three triple layers or other plural layers. At this time, an intermediate material such as an insulating sheet is interposed between the windings of each layer.

[0030]

As described above, in the present invention, the drive coil attached to the outer peripheral portion of one contact is formed of an insulating coated flat copper wire having a substantially rectangular cross section. By forming it by winding it in a single layer so that the sides of the long dimension of the vertical width are in close contact with each other, the stress of the electromagnetic force generated in the drive coil can be accommodated by the vertical dimension of the long dimension, and the flat width of the horizontal dimension of the short dimension. Since the copper wires are supported between the respective side surfaces, they can be robustly formed with a simple structure. Further, since the rectangular copper wire is formed by being wound in a single layer, there is an effect that the number of parts is reduced as much as possible and the assembling workability is improved in manufacturing. Further, in the present invention, by disposing the tip portion of one contact to be positioned between the center portion of the substantially horizontal width of the coil winding and the inner end portion thereof, the arc generated at the time of opening is reduced. The contact can be smoothly moved to the arc runner side, and the arc extinguishing operation can be performed more reliably. Further, in the present invention, the one contact portion is arranged with reference to the side end step portion of the base side screw thread, and the positioning protrusion that abuts against this side end step portion is formed on the inner side of the mounting side screw thread. Therefore, by simply screwing the mounting side screw thread onto the base side screw thread and tightening it until the positioning protrusion contacts the side edge step, the positional relationship between the preset contact portion and the arc runner is set. This has the effect of enabling highly accurate and simple positioning and attachment. In addition, in the present invention, since the base portion of one contact is formed of a conductive material, it is possible to screw the base side screw thread and the mounting side screw thread into each other by screwing and tightening the screws between the screw threads. Are brought into contact with each other, so that there is an effect that they can also serve as a current-carrying portion to the arc runner side.

[Brief description of drawings]

FIG. 1 is a detailed sectional view of an arc extinguishing device for a circuit breaker according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an assembled state of the arc extinguishing device for the circuit breaker shown in FIG.

3 is a characteristic explanatory diagram of stress with respect to an electromagnetic force of a drive coil in the arc extinguishing device for a circuit breaker shown in FIG.

FIG. 4 is a side view of the arc extinguishing device for the circuit breaker after assembly according to FIG. 2;

FIG. 5 is a detailed cross-sectional view of a conventional arc extinguishing device for a circuit breaker.

6 is an explanatory view of an assembled state of the arc extinguishing device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 and 10 Arc runner 2 Coil bobbin 3 and 30 Drive coil 4 Insulating part 5 and 50 Flange mounting part 11 and 13 Runner body 11a, 13a and 53a Collar part 12 Runner mounting screw 21 Bobbin body 22 Storage part 31 and 34 Winding 32 and 32a Protective member 33 Adhesive tape 35 Exterior tube 41 Insulation body 42 Insulation mounting screw 51 Flange body 52, 54 Female screw 53 Positioning protrusion 55 Nut 56 Insulation mounting screw 100 Fixed contact part 101 Male screw 101a Side end step 102 Fixed contact 103 Garter Spring 200 Moving Contact 201 Moving Contact 202 Insulating Arm 300 Power Supply Bushing 400 Case Body 500 Spindle

Claims (5)

[Claims] 1. A circuit breaker for opening and closing an electric line, the circuit breaker being fixed to a base part of one of the two contactors of the circuit breaker, and the outer peripheral portion of the contactor being fixed. A drive coil is mounted so as to surround it, and an arc runner made of a conductive material is arranged inside the drive coil.
In an arc-extinguishing device of a circuit breaker, which displaces an arc generated when the two contacts are opened by moving on an arc runner in a direction orthogonal to a magnetic field generated in the drive coil, the drive coil is an insulating rectangular copper. The side surfaces of the wire are wound in a single layer so as to be in close contact with each other, and the end portion of the rectangular copper wire on one end side of the drive coil is connected to the base portion of the one contactor, and the other end side An arc extinguishing device for a circuit breaker, characterized in that an end of a flat copper wire is connected to the arc runner. 2. The arc-extinguishing device for a circuit breaker according to claim 1, wherein the drive coil is arranged such that a tip portion of the one contact is located between a substantially center of a lateral width of a coil winding and an inner end portion. An arc extinguishing device for a circuit breaker, characterized in that 3. A circuit breaker for opening and closing an electric line, wherein conductive is provided on a base portion of one of the two contactors of the circuit breaker and an outer front surface of the one contactor. A circuit breaker arc extinguishing device having an arc runner formed of a conductive material, wherein a base side screw thread is formed on a base part of the one contactor, and a side end step part of the base side screw thread is formed. The one contactor is arranged on the basis of, and a mounting side screw thread is formed at the mounting side end of the arc runner, and a positioning protrusion is formed on the back side of the mounting side screw thread, An arc extinguishing device for a circuit breaker, characterized in that a side screw thread and a mounting screw thread are screwed together and tightened until a positioning protrusion comes into contact with the side end step portion. 4. The arc-extinguishing device for a circuit breaker according to claim 3, wherein the base portion of the one contact is made of a conductive material, and the base-side screw thread and the mounting-side screw thread are screwed together. An arc extinguishing device for a circuit breaker, characterized in that the current flowing through one contact is supplied to the arc runner side. 5. An arc-extinguishing device for a circuit breaker, comprising the above-mentioned first and third aspects.