JP2003109484A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple-structure and low-cost circuit breaker having superior energization performance by constituting a movable-side contact capable of easily replacing a contact member exhausted by opening/closing arc, of a member manufactured by sheet metal working. SOLUTION: A plate fitting leg 12b is provided on the rear surface of a movable-side arc contact piece 12 for fitting the movable-side arc contact piece 12 to the tip of a pair of movable-side arc contacts 11, the movable-side arc contacts 11 are disposed as clamping the fitting leg 12b between them, and the movable-side arc contact piece 12 is fitted by a screw 18 and nut 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contactor structure having a replaceable opening / closing contact portion of a circuit breaker.

[0002]

2. Description of the Related Art An example of a conventional circuit breaker is shown in FIGS. This circuit breaker includes a terminal 51 and a terminal 52, one of which is an input side and the other of which is an output side, a contact holder 54 rotatably held by a shaft 53, and a shaft 55 in the contact holder 54 independently of each other. A flexible conductor 5 that connects the movable side arcing contact 56 and the pair of movable side main contacts 57, the movable side arcing contact 56 and the movable side main contact 57 and the terminal 52, which are rotatably held.
8, a fixed arcing contact 59 attached to the terminal 51, and a movable arc base 63 attached to the movable arcing contact 56. The main contact 6 is attached to each of the terminal 51, the movable side main contact 57, the fixed side arcing contact 59 and the movable arcing base 63 of the main circuit conductive portion.
0, the main contact 61, the arcing contact 62, and the arcing contact 64 are directly brazed. The movable arcing contact 56 and the movable main contact 57 are biased in the clockwise direction by a contact spring 65 provided in the holder 54 via a pin, and the main contact 60 and the main contact 61 are in contact with each other. . Although not shown, the movable arcing contact 56 also has a main contact 61, and contacts the main contact 60 like the main contact 61 of the movable main contact 57 in the closed state. However, arcing contact 62 and arcing contact 6
4 has a structure that opens in the closed state.

Since the opening / closing mechanism of this circuit breaker is not related to the main part of the present invention, a detailed description of its structure and operation will be omitted, but if the opening operation is performed in the closed state shown in FIG. The mechanism 66 operates to rotate the lever 68 clockwise about the shaft 67 by a predetermined angle.
Due to this rotation, the contact holder 54 rotates counterclockwise via the link member 69, the arcing contact 62 and the arcing contact 64 first contact, then the main contact 60 and the main contact 61 separate, and then the arcing contact. 62 and the arcing contact 64 are also separated to be in an open circuit state. On the other hand, when the closing operation is performed, the lever 68 rotates counterclockwise and the contact holder 54 rotates clockwise via the link member 69, so that the arcing contact 62 and the arcing contact 64 first come into contact with each other, and then the main contact 60. And the main contact 61 also come into contact, and then the arcing contact 62 and the arcing contact 64 as shown in FIG.
It has a structure in which only that part is opened.

As described above, the arcing contact 62 and the arcing contact 64 are opened later than the main contact 60 and the main contact 61 in the opening operation, so that an arc is generated between them and they are damaged. Therefore, the fixed side arcing contact 59 and the arcing base 63 are attached to the terminal 51 and the movable side arcing contact 56 by screws so that they can be replaced when the damage becomes large by opening and closing a large number of times. That is, referring to FIG. 9, the arcing base metal 63 has an arcing contact 64 brazed on the front side and a male thread 70 attached in a stud shape on the back side, and this male thread 70 is inserted into the through hole 56a. And is attached to the movable side arcing contact 56 with a nut.

[0005]

In the conventional circuit breaker as described above, the movable side arcing contact 56 and the movable side main contactor 57, which are the main circuit conductive parts, can carry a large current. The cross-sectional area was relatively large and thick. However, there is a growing demand for circuit breakers that can carry larger currents even with the same external dimensions, and it is becoming common to have a large number of thin plate materials arranged in parallel as movable contacts. It was That is, with such a structure, the number of contacts of the movable side contact with respect to the contact of the fixed side contact increases, the contact resistance decreases, and the heat dissipation effect is good, so that the current-carrying capacity can be increased. Further, instead of the conventional thick parts that require special processing such as forging and cutting, plate-shaped parts that can be manufactured by press working can be used, so that it has become possible to manufacture at low cost.

However, the male screw 70 of the arc base 63
Is required to have a predetermined diameter so as to withstand a mechanical impact generated when the contacts are contacted during the opening / closing operation, and the thickness of the movable arcing contact 56 is formed to form the through hole 56a into which the male screw 70 is inserted. There was a problem that it could not be thin.

Therefore, according to the present invention, the movable contactor, which can easily replace the contactor member consumed by the opening / closing arc, is made of a member that can be manufactured by sheet metal working, so that the current-carrying performance is excellent and the manufacture is simple. An object is to provide an inexpensive circuit breaker.

[0008]

In order to solve the above-mentioned problems, the invention of claim 1 has a stationary contact, a movable contact rotatably provided, and a stationary contact on the surface. In a circuit breaker having a contact piece that has an opening / closing contact part and a mounting leg on the back surface and is detachably attached to a movable contact,
The mounting leg of the contact piece and the movable contact are integrated by a screw arranged in a direction orthogonal to the rotating direction of the movable contact. With this configuration, the thickness of the movable contact is independent of the diameter of the mounting screw,
It may be of a thinner material.

According to a second aspect of the present invention, in the circuit breaker of the first aspect, since the movable side contactor is arranged so as to sandwich the mounting leg, the plurality of movable side contactors can more firmly contact the contact piece. Can hold.

According to a third aspect of the present invention, in the circuit breaker according to the second aspect, the movable side contactor is a movable side arc contactor, and has a movable side main contactor provided with the movable side arc contactor. Since the thickness of the mounting leg is thicker than the thickness of the movable side main contactor, the movable side main contactor can be arranged between a plurality of movable side arc contactors and an arc is generated when the current is cut off. The opening / closing contact part of the arc contact, which is damaged, can be easily replaced.

According to a fourth aspect of the present invention, there is provided a fixed side contactor, a movable side contactor rotatably provided, an opening / closing contact portion for the fixed side contactor on the front surface, and a mounting leg on the back surface for the movable contact. In a circuit breaker having a contact piece detachably attached to a child, a mounting leg is a screw member, and movable side contacts are arranged parallel to both sides of the screw member, and the contact member is provided by the screw member. The contact piece is attached so that the back surface of the piece is pressed against the movable contact piece. With such a configuration, the thickness of the movable-side contact is independent of the diameter of the mounting screw, and a thinner material may be used.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The mode for carrying out the present invention will be described with reference to the embodiments shown in FIGS. 1 and 2
The circuit breaker of the embodiment shown in FIG. 3 includes an opening / closing contact member formed in a case 1 made of a molded insulator, an opening / closing mechanism formed outside the case 1, and a case 1 One has an input side and the other has an output side terminal 2 and terminal 3 mounted so as to protrude from the other side.

The open / close contact member is fixed to the case 1 and the fixed side main contact 4 connected to the terminal 2, the fixed side arc contact 5 detachably provided on the fixed side main contact 4. A frame 6 and a contact holder 8 made of a molded insulator, which is rotatably provided on the frame 6 by a holder shaft 7.
The movable side main contactor 10 and the movable side arc contactor 11 provided on the contactor holder 8 so that they can rotate independently of each other by the contact shaft 9, and the movable side arc detachably provided on the movable side arc contactor 11. A flexible lead 13 for connecting each of the contact piece 12, the movable main contact 10 and the movable arc contact 11 to the terminal 3, and a spring for rotationally urging the movable main contact 10 and the movable arc contact 11. Have fourteen. A contact 15 is brazed to the fixed main contactor 4 described above, and a contact 16 is brazed to the movable arc contact 11 together with the movable main contact 10. Further, an arc-shaped opening / closing contact portion 5a is formed in the fixed-side arc contactor 5 so that the movable-side arc contactor piece 12 can surely come into contact with the planar opening / closing contact portion 12a. Further, the case 1 accommodates a detachable arc extinguishing device 17 that extinguishes an arc generated when the electric current is cut off, and a detachable cover 1a is attached to an upper portion of the case 1.
Is provided. In FIG. 2, the flexible lead 13
Are not shown.

The movable side main contactor 10 and the movable side arc contactor 11 described above are made of a copper plate having a thickness that allows press working, and the movable side main contactor 10 described above is provided on the contact shaft 9.
Are provided in plurality (13 in the case of the present embodiment), and a pair of movable-side arc contacts 11 are arranged in the central portion. The flexible lead 13 and the spring 14 described above are provided independently for each movable side main contactor 10 and movable side arc contactor 11, and all the movable side main contactors 10 rotate independently. To do. Further, the pair of movable-side arc contactors 11 rotate integrally because they are connected by the movable-side arc contactor piece 12 at the tip, but rotate independently of all the movable-side main contactors 10. A plate-shaped mounting leg 12b having a through hole for mounting is integrally formed on the back side of the opening / closing contact portion 12a of the movable-side arc contact piece 12, and the pair of movable-side arc contactors 11 are mounted on the mounting leg 12.
Through holes are formed so as to sandwich b, and through holes for attaching the movable side arc contact piece 12 are formed. Then, the screw 18 is inserted into both through holes, and the movable side arc contact piece 12 is attached to the movable side arc contact piece 11 with the nut 19. Since the mounting leg 12b of the movable-side arc contact piece 12 is formed to be slightly thicker than the thickness of the movable-side main contact piece 10, the distance between the pair of movable-side arc contact pieces 11 is 1
The movable main contactors 10 are mounted individually to provide an efficient arrangement.

In the circuit breaker of this embodiment, in the closed state shown in FIG. 1, the arc-shaped open / close contact portion 5a of the fixed side arc contactor 5 and the open / close contact portion 12a of the movable side arc contact piece 12 are provided. Are separated, and the contact point 15 of the fixed side main contactor 4 and the contact point 16 of the movable side main contactor 10 are in contact with each other. When the circuit opening operation is performed, the crossbar 21 of the opening / closing mechanism 20 rotates counterclockwise together with the lever 22, and at one end, the connecting shaft 2
A link 2 connected to the lever 22 by 3 and connected to the contact holder 8 at the other end by a contact shaft 9.
4, the contact holder 8 rotates counterclockwise together with the movable main contact 10 and the movable arc contact 11.

The operation by this rotation will be described with reference to FIG. Although illustration of the movable side main contactor 10 is omitted in FIG. 3, the “movable side arc contactor 11” is referred to as “the movable side arc contactor 11” in the following description with reference to FIG. It also means the movable side main contactor 10 ″. When the contact holder 8 is rotated counterclockwise, the contact shaft 9 is displaced to the left, so that the movable arc contact 11 is rotated clockwise until it comes into contact with the stopper 25 on the contact holder 8 by the action of the spring 14. To do. Then, from the closed state of FIG. 3 (a), as shown in FIG. 3 (b), the arc-shaped opening / closing contact portion 5a of the fixed-side arc contactor 5 and the opening / closing contact of the movable-side arc contactor piece 12 are first contacted. Part 1
2a make contact, and then contact 16 separates from contact 15, as shown in FIG. Furthermore, FIG.
As shown in (d), the opening / closing contact portion 12a is separated from the arc-shaped opening / closing contact portion 5a, and an arc is generated between the fixed side arc contactor 5 and the movable side arc contact piece 12. Has become. When the circuit closing operation is performed, the crossbar 21 rotates clockwise and the contact holder 8 rotates clockwise, contrary to the circuit opening operation. First, the movable side arc contact piece 12 is fixed to the fixed side arc contact piece. 5, the contact 16 then contacts the contact 15, and then the movable arc contact piece 12 is separated from the fixed arc contact 5.

As described above, the stationary side arc contactor 5 and the movable side arc contactor piece 1 in which an arc is generated during the opening operation.
When replacing 2, the cover 1a of the case 1 is removed, the arc extinguishing device 17 is taken out, the fixed side arc contactor 5 is loosened by loosening the screw 32, and the movable side arc contactor piece 12 is loosened by removing the screw 18, and a new product is obtained. Can be exchanged for.

In the embodiment described above, the mounting leg 12b is arranged so as to be sandwiched between the pair of movable side arc contactors 11, and the movable side arc contact piece 12 is moved by the screw 18 and the nut 19. It is attached to the child 11. As another embodiment, as shown in FIG. 4A, one movable side arc contactor 11 is attached so as to be sandwiched between a pair of mounting legs 12'b of the movable side arc contactor piece 12 '. As shown in Fig. 4 (b), one movable side arc contactor 11 is sandwiched between a pair of mounting legs 12'b, and further movable side arc contact is made on the outside of the mounting leg 12'b. The child 11 is arranged and these are tightened with screws, or one movable side is attached to one mounting leg 12 "b of the movable side arc contact piece 12" as shown in FIG. 4 (c). The arc contactor 11 may be attached. Further, as shown in FIG. 4D, a female screw 26 may be formed on the mounting leg of the movable arc contact piece or the movable arc contact instead of the nut 19.

Further, as another embodiment, as shown in FIG. 5, a movable side contact piece 28 having a screw 27 on the back surface is used instead of the movable side arc contact piece 12, and a male thread 27 is used. Movable side arc contactors 11 are arranged on both sides of the movable side arc contactor 11 and the movable side arc contactor 11 is bent through a washer 29 so as to hold the movable side arc contactor 11 from both sides.
May be attached by contacting the back surface of the movable contact piece 28. Also in this case, if the diameter of the male screw 27 is slightly larger than the thickness of the movable side main contactor 10, the movable side main contactor 10 can be arranged between the pair of movable side arc contactors 11.

Further, as a modified example of FIG. 5, FIG.
As shown in FIG.
6B, the movable side arc contactor 30 is bent in an inverted U shape as shown in FIG. 6B, or the movable side having a ring-shaped bent portion as shown in FIG. 6C. In each of the arc contactors 31, a screw 27 is inserted into the bent portion, and the back surface of the movable side contact piece 28 and the movable side arc contactor 30 or the movable side arc contactor 31 are brought into contact with each other and attached by a nut. You can also use it.

Although the embodiments of the present invention have been described above, the embodiments of the present invention disclosed above are as follows.
It is merely an example, and the scope of the present invention is not limited to the above-described embodiments of the invention. The scope of the present invention is shown by the description of the claims, and is intended to include meanings equivalent to the description of the claims and all modifications within the scope.

[0022]

The present invention is embodied in the form described above, and has a fixed side contactor, a movable side contactor rotatably provided, and an opening / closing contact portion for the fixed side contactor on the front surface. In a circuit breaker having a contact piece detachably mounted on a movable contactor with a mounting leg, the mounting leg of the contact piece and the movable contactor are in a direction orthogonal to the rotating direction of the movable contactor. Since it is integrated by the screw arranged in the, the movable contact can be made of a thin material that can be manufactured by sheet metal processing without worrying about the thickness when mounting the contact piece that is consumed by the opening and closing arc. In addition, it is possible to provide a circuit breaker that is excellent in energization performance, simple in manufacturing, and inexpensive.

The attachment leg of the contact piece is a screw member, and the movable contacts are arranged on both sides of the screw member so as to be parallel to each other, and the back surface of the contact piece is pressed against the movable contact by the screw member. Even if the contact piece is mounted as described above, the same effect can be obtained. With such a configuration, the thickness of the movable-side contact is independent of the diameter of the mounting screw, and a thinner material may be used.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of a circuit breaker according to the present invention.

2 is a front view of an opening / closing contact portion of the circuit breaker of FIG.

FIG. 3 is a partial view illustrating the opening process of the circuit breaker of FIG.

FIG. 4 is a diagram illustrating a movable-side contact piece according to another embodiment.

FIG. 5 is a diagram for explaining a movable contact piece according to still another embodiment.

FIG. 6 is a diagram illustrating a movable-side contact piece according to still another embodiment.

FIG. 7 is a side sectional view of a conventional circuit breaker.

8 is a front view of an opening / closing contact portion of the circuit breaker of FIG.

9 is an exploded view of a movable-side contact piece of the circuit breaker of FIG.

[Explanation of symbols]

1 case, 1a cover, 2, 3 terminals, 4 fixed-side main contactor, 5 fixed-side arc contactor, 5a arc-shaped opening / closing contact part, 6 frame, 7 holder shaft, 8 contactor holder, 9 contact shaft, 10 Movable main contactor, 1
1, 30, 31 Movable arc contactor, 12, 12 ', 1
2 ", 28 movable side arc contact piece, 12a open / close contact part, 12b, 12'b, 12" b mounting leg, 13 flexible lead, 14 spring, 15, 16 contacts, 17 arc extinguishing device, 18, 32 screw , 19 nuts, 20 opening and closing mechanism,
21 crossbar, 22 lever, 23 connecting shaft, 24
Link, 25 stopper, 26 female thread, 27 male thread, 29 washer

Claims (4)

[Claims] 1. A fixed contact, a movable contact rotatably provided, an opening / closing contact portion for the fixed contact on the front surface, and mounting legs on the back surface for attachment / detachment to / from the movable contact. In a circuit breaker equipped with a freely attachable contact piece, the mounting leg of the contact piece and the movable side contact are integrated by a screw arranged in a direction orthogonal to the rotation direction of the movable side contact. A circuit breaker characterized by being performed. 2. The circuit breaker according to claim 1, wherein the movable contact is arranged so as to sandwich the mounting leg. 3. The movable side contactor is a movable side arc contactor, and has a movable side main contactor provided with the movable side arc contactor, and the thickness of the mounting leg is the movable side main contactor. The circuit breaker according to claim 2, wherein the circuit breaker is thicker than the thickness. 4. A fixed side contactor, a movable side contactor rotatably provided, an opening / closing contact portion for the fixed side contactor on the front surface, and mounting legs on the back surface for attachment / detachment to / from the movable contactor. In a circuit breaker equipped with a freely attachable contact piece, the mounting leg is a screw member, and the movable contacts are arranged in parallel on both sides of the screw member, and the contact is made by the screw member. A circuit breaker, wherein the contact piece is mounted so that the back surface of the piece is pressed against the movable contact piece.