JPH1031952A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and precisely arrange a permanent magnet in a prescribed position by holding the permanent magnet by a holder to arrange it at the prescribed position. SOLUTION: When a handle is rotated clockwise, a movable arm 13 is also rotated clockwise, and a movable contact 14 makes contact with a fixed contact 15. When the handle 5 is returned from the position fallen to the right side to the position fallen to the left side, the movable arm 13 is rotated counterclockwise, and the movable contact 14 is separated from the fixed contact 15. A permanent magnet 41 is arranged on the extension line between the movable contact 14 in OFF position and the fixed contact 15. A pair of grooves 42a, 42b for engaging a holder 40 are provided on the wall surface of a first vessel half body 4a, and part of the holder 40 is engagingly locked thereby. Since the magnet 41 is held by the holder 40 and arranged in a prescribed position in this way, not only dropping-out of the magnet 41 can be prevented, but also the magnet can be easily and precisely arranged in the prescribed position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker such as a manual switch or an electromagnetic circuit breaker for turning on and off an electric circuit.

[0002]

2. Description of the Related Art In a switch or an electromagnetic circuit breaker, a permanent magnet (magnet) is fixed between a fixed contact and a movable contact in order to eliminate an arc generated when the movable contact is separated from the fixed contact based on Fleming's left-hand rule. Placement in the vicinity is known.

[0003]

However, in a conventional switch or electromagnetic circuit breaker, the permanent magnet is only fixed to the inner wall of the container with an adhesive. There was a danger that the permanent magnet would fall off. Further, it has been difficult to bond a permanent magnet to a predetermined position when assembling a switch or an electromagnetic circuit breaker.

Accordingly, an object of the present invention is to provide a circuit breaker capable of stably and accurately holding a permanent magnet.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a container, a fixed contact and a movable contact disposed in the container, and the fixed contact accommodated in the container and wherein the movable contact is provided. A movable arm supporting the movable contact so that the movable contact can be freely moved in and out, a handle for manually opening and closing the fixed contact and the movable contact, and the movable contact from the fixed contact. In a circuit breaker provided with a permanent magnet for removing an arc generated when separating from the fixed contact and the movable contact, a holder for holding the permanent magnet and a container are provided on the container. And a holder for the holder. As described in claim 3, the first and second circuit breakers are juxtaposed via a spacer, a hole (recess) is provided in the spacer, and a permanent magnet can be disposed here. In addition, as described in claim 4, the first and second circuit breakers are juxtaposed, a recess is provided on at least one outer peripheral surface of the container of the two circuit breakers, and a permanent magnet is arranged here. it can. Further, as set forth in claims 2 and 5, a current or voltage detecting device and an opening / closing mechanism responsive thereto can be further provided. In the present application, the circuit breaker and the circuit breaker are a switch that manually opens and closes a contact, an electromagnetic circuit breaker that turns off the contact by detecting a voltage or current, a bimetal, and the like to detect an abnormality by heat and to close the contact. Any device that has a fixed contact and a movable contact, such as a circuit breaker that is turned off, is meant.

[0006]

According to the first and second aspects of the present invention, since the permanent magnet is held by the holder, it is possible to prevent the permanent magnet from falling off and being displaced. Further, the permanent magnet can be accurately arranged at a desired position. Claim 3
According to (5), the permanent magnet can be reliably held outside the container. Further, since the permanent magnet is arranged outside the container, this arrangement can be easily achieved.

[0007]

First Embodiment Next, a circuit breaker according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the inside of the circuit breaker 1 with a half of a container (case) removed. That is, the synthetic resin container (case) of the circuit breaker 1
Reference numeral 4 denotes first and second container halves 4a and 4a as shown in FIG.
b, the first container half 4a is shown in FIG.
Only shown. A movable contact 14 supported by a movable arm 13, a fixed contact 15, a switch link 3, a frame 7, and a permanent magnet 41 held by a holder 40 are housed in the container 4. The movable contact 14 is connected to one terminal (load terminal) 12 via the movable arm 13 and the flexible lead wire 8a. The fixed contact 15 is connected to the other terminal 16. The movable arm 13 is rotatably supported by a fixed shaft 17 supported by the frame 7. The handle 5 is rotatably supported by a shaft 20 supported by the frame 7. The upper end of the link 3 is rotatably connected to the lower end of the handle 5 by a pin 27, and the lower end of the link 3 is rotatably connected to the movable arm 13 by a pin 29. Therefore, when the handle is rotated clockwise in FIG. 1, the movable arm 13 also rotates clockwise, and the movable contact 14 contacts the fixed contact 15. Further, when the handle 5 is returned from the position where the handle 5 is tilted rightward to the position where the handle 5 is tilted leftward in FIG.
The movable arm 13 rotates counterclockwise, and the movable contact 1
4 is separated from the fixed contact 15.

The permanent magnet 41 is disposed on an extension line between the movable contact 14 and the fixed contact 15 in the off position. Magnet 4
The holder 40 according to the present invention for disposing 1 is made of a synthetic resin which is a non-magnetic material. A pair of grooves 42a and 42b for engaging the holder 40 is provided on the wall surface of the first container half 4a, and a part of the holder 40 is locked here. A groove 43 for arc diffusion, absorption or suppression is provided on the wall surface of the first container half 4a.

As is apparent from FIG. 3, the holder 40 is formed in a U-shape or a U-shape when viewed from above, and the first and second portions 44 and 45 facing each other and a third portion intermediate therebetween. Having. A hole or recess 47 is provided on the outer surface of the first portion 44, into which the disc-shaped magnet 41 is inserted. Since the outer sides of the first and second portions 44 and 45 of the holder 40 face the inner wall surfaces of the first and second container halves 4a and 4b, the magnet 41 and the first portion 44 and the first It is sandwiched between the container half 4a and does not separate from the recess 47. The third portion 46 is provided with a constricted portion 46a as shown in FIG. 5 in order to allow the first and second portions 44 and 45 of the holder 40 to be elastically displaced.
As shown in FIGS. 2 and 3, a slit-like opening 48 is provided at the center of the side surface of the container 4, that is, at the boundary between the first and second container halves 4a and 4b, in order to discharge the arc out of the container 4. Is provided.

In this embodiment, the magnetic pole of the magnet 41 is
As shown in FIG. 3, the inner surface of the container 4 is an N pole, and the outer surface is an S pole. Therefore, when the current is turned off while the current is flowing in the direction from the terminal 16 to the terminal 12, that is, in the direction from the fixed contact 15 to the movable contact 14, an arc discharging effect according to Fleming's left-hand rule occurs.

As is apparent from the above description, in the present embodiment, the magnet 41 is held at the holder 40 and arranged at a predetermined position, so that the magnet 41 is not only prevented from falling off but also easily and accurately placed at the predetermined position. Can be arranged. Also,
As shown in FIG. 7, engagement grooves 42 a and 42 b are provided in the container 4, and the engagement portions 48 and 49 of the holder 40 are inserted therein, so that attachment and positioning of the holder 40 can be easily achieved. it can. The holder 40 is formed in a U-shape or a U-shape in plan view, and has a constricted portion 46a in the middle third portion 46, so that it can be elastically deformed, as shown in FIG. Can be stably arranged along the wall surface of the container 4.

[0012]

Second Embodiment Next, an electromagnetic circuit breaker 1a according to a second embodiment will be described with reference to FIGS. However, FIG.
In FIG. 9 and FIG. 9, substantially the same parts as those in FIG. 1 to FIG. That is, the circuit breaker 1a of the second embodiment is different from the first embodiment in that a trip operation by the electromagnet 6 can be performed in addition to the manual turning on and off of the handle 5;
Is held by the holder 40 in the same manner as in the first embodiment.

FIGS. 8 and 9 show the internal structure of the container 4 in the same manner as in FIG. 8 shows the ON state, and FIG. 9 shows the manual OFF operation state and the final state of the trip operation. The switch unit 2 can be turned on / off by a handle 5 and turned off by a trip operation. Reference numeral 6 denotes an electromagnet responding to an overcurrent, that is, a current detecting device, which has a coil 8 and a magnetic core 9 supported by a metal frame 7,
Is configured to be sucked. One end of the coil 8
The other end is connected to a first terminal 12, and the other end is connected to a metal movable arm 13 by a flexible lead wire 8a. The movable arm 13 made of metal has a movable contact 14, which selectively contacts a fixed contact 15. Since the fixed contact 15 is connected to the first terminal 16, when the two contacts 14 and 15 are on, the first terminal 12, the coil 8, the lead wire 8a, the arm 13, the movable contact 14, and the fixed contact 15 And an electric circuit comprising the second terminal 16 is formed.

The movable arm 13 is rotatably supported by a fixed shaft 17 supported by the frame 7, and is biased counterclockwise in FIG. 8 by a spring 18 wound around the shaft 17. However, in the ON state in FIG. 8, the arm 13 is pressed in the clockwise direction by the toggle link mechanism 19 provided between the handle 5 and the arm 13, so that the arm 13 is held in the ON state. The frame 7 is made of a magnetic metal, and includes a coil mounting portion, an insertion hole for a pin 35, and a shaft 17.
8 and 9, only a part thereof is shown in FIGS.

The handle 5 has a shaft 20, that is, a boss.
Are rotatably supported by bearings 21 of the fixed frame 7 shown in FIG. The toggle link mechanism 19 includes a first link 22 acting as a cam link, a second link 23 acting as a trip mechanism holding link, and a lock pin 24 generally called a shear pin rotatably supported by the second link 23.
An armature engaging piece 25 generally called a strike cover fixed to the lock pin 24; a spring 26 for biasing the lock pin 24 and the engaging piece 25 clockwise;
2 for rotatably connecting the first link 22 to the
7, a pin 28 for rotatably connecting the first link 22 and the second link 23, and the arm 1
3 and a pin 29 rotatably connected to the pin 3.

As is clear from FIG. 10 showing only the toggle link mechanism 19 and FIG. 11 showing the relationship between the lock pin 24 and the first link 22, the first link 22 has
4 and a cam surface 31 formed so that the first link 22 can rotate in the counterclockwise direction without being restricted by the pin 24. A hole 32 for inserting the pin 27 and a hole 33 for inserting the pin 28 are provided. Lock pin 24 is connected to first link 22.
When the lock pin 24 is rotated counterclockwise to be in a locked state, the first link 22 is turned counterclockwise when the lock pin 24 is turned counterclockwise. It has a notched surface 34 for allowing.

The armature 11 shown in FIGS. 8 and 9 is rotatably supported by a fixed shaft 35 and is biased clockwise by a spring 36 wound around the shaft 35. The armature 11 has a trip operating portion 37 for hitting the engaging piece 25 in a counterclockwise direction when the armature 11 is attracted by the magnetic pole 10 and rotates counterclockwise. Note that the shaft 35 is supported by the frame 7, and the frame 7 is fixed to the container 4a.

Next, the operation of the circuit breaker 1a will be described. When an overcurrent flows through the coil 8 in the on state of the pair of contacts 14 and 15 shown in FIG.
The armature 11 is rotated in the counterclockwise direction in FIG. 8 to rotate the engagement piece 25 counterclockwise against the spring 26. As a result, the lock pin 24 most clearly shown in FIG.
The engagement of the first link 22 with the cam surface 30 of the first link 22 is released, the first link 22 becomes displaceable, and the toggle link mechanism 19 is bent in an inverted letter shape, and the arm 13 is turned by the force of the spring 18. Rotates counterclockwise, the movable contact 14 separates from the fixed contact 15, and finally enters the OFF state in FIG.

The manual on / off operation of the circuit breaker 1a of the second embodiment is almost the same as that of the circuit breaker of the first embodiment.

In the second embodiment, since the magnets 41 are arranged in the holder 40 in the same manner as in the first embodiment, the same functions and effects as those of the first embodiment can be obtained.

[0021]

Third Embodiment Next, a circuit breaker according to a third embodiment will be described with reference to FIGS. The circuit breaker of FIG. 12 includes first and second circuit breakers (switches) 1b,
1c and a spacer 51. The first and second circuit breakers 1b and 1c are the same as those shown in FIGS. 1 and 2 except that the holder 40 and the magnet 41 are omitted from the circuit breaker 1 shown in FIGS. Therefore, in FIG. 12, substantially the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted. First and second circuit breakers 1b, 1c
Are juxtaposed via a spacer 51 made of synthetic resin.
The spacer 51 has a hole 52 in which the magnet 41 is inserted. Note that the first and second circuit breakers 1b,
1c and the spacer 51 are integrated by a plurality of screw rods 53. The magnet 41 is connected to the movable contact 14 as in FIG.
And fixed contact 15 near the region.

Also in this embodiment, since the magnet 41 is held by the spacer 51, the magnet is prevented from falling off and the positioning is accurately achieved.

[0023]

Fourth Embodiment Next, a circuit breaker according to a fourth embodiment will be described with reference to FIGS. The circuit breaker shown in FIG. 14 has a structure in which first and second circuit breakers 1d and 1e are juxtaposed and integrated by a plurality of screw rods 61. The first and second circuit breakers 1d and 1e omit the holder 40 and the magnet 41 from the circuit breaker 1 shown in FIGS. 1 and 2,
Instead of providing the concave portions 62 and 63 on the outer peripheral surface of the container instead, the configuration is the same as the circuit breaker 1 of FIGS. 1 and 2. Therefore, in FIG. 14, substantially the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 15, concave portions 62 and 63 are formed in the outer surfaces of the opposing container halves 4a and 4b of the first and second circuit breakers 1d and 1e.
Is inserted. The magnet 41 has two container halves 4a, 4a
It is not dropped because it is arranged between b. Further, by providing the concave portions 62 and 63 in advance, the magnet 41 can be accurately positioned and easily mounted.

[0025]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) First and second circuit breakers 1b and 1c in FIG.
14 or at least one of the first and second circuit breakers 1d and 1e in FIG. 14 can be replaced with one having an electromagnetic trip opening and closing mechanism as shown in FIG. (2) The two circuit breakers 1b, 1 shown in FIGS.
c and 1d, 1e can be configured to work together. (3) It is possible to provide an auxiliary switch that is linked to turning on and off the contacts 14 and 15.

[Brief description of the drawings]

FIG. 1 is a front view showing a circuit breaker of a first embodiment with a container half removed;

FIG. 2 is a right side view of the circuit breaker of FIG. 1;

FIG. 3 is an enlarged cross-sectional view showing a part of line AA in FIG. 2;

FIG. 4 is a plan view of the holder.

FIG. 5 is a side view of the holder as viewed from the direction of line BB in FIG. 4;

FIG. 6 is a side view of the holder as viewed from the direction of the line CC in FIG. 5;

7 is a front view of the holder taken along line DD in FIG. 4 and showing engagement with a groove.

FIG. 8 is a front view of an ON state showing the circuit breaker of the second embodiment with the container half removed;

FIG. 9 is a front view showing an off state of the circuit breaker of FIG. 8;

FIG. 10 is a perspective view showing a toggle opening / closing mechanism.

FIG. 11 is an enlarged front view showing one of the links in FIG. 10;

FIG. 12 is a side view showing a circuit breaker according to a third embodiment.

FIG. 13 is a perspective view showing a spacer and a magnet of FIG. 12;

FIG. 14 is a side view showing a circuit breaker according to a fourth embodiment.

FIG. 15 is a sectional view showing a part of FIG. 14;

[Explanation of symbols]

 4 Container 14 Movable contact 15 Fixed contact 40 Holder 41 Magnet

Claims (5)

[Claims] 1. A container, a fixed contact and a movable contact arranged in the container, and the movable contact supported in the container so that the movable contact is freely movable toward and away from the fixed contact. A movable arm, a handle for opening and closing the fixed contact and the movable contact by manual operation, and an arc generated when the movable contact is separated from the fixed contact between the fixed contact and the movable contact. A circuit breaker provided with a permanent magnet for removing the permanent magnet from between, comprising: a holder for holding the permanent magnet; and a mounting portion for the holder provided in the container. Circuit breaker. 2. A detecting device for detecting whether or not a voltage or a current of an electric circuit to which the fixed contact and the movable contact are connected has reached a predetermined value or more, and a detecting device which is contained in the container. And moving the movable arm so that the movable contact is separated from the fixed contact in accordance with the operation of the handle and the movable contact is brought into contact with the fixed contact. An opening / closing mechanism associated with the handle, the movable arm, and the detection device so that the movable contact can be separated from the fixed contact in response to detection of a predetermined value or more. The circuit breaker according to claim 1, wherein 3. A circuit breaker in which first and second circuit breakers are juxtaposed, wherein each of the first and second circuit breakers is disposed in a container made of a non-magnetic material and in the container. Fixed contact and movable contact, a movable arm that is accommodated in the container and supports the movable contact so that the movable contact can freely contact and separate from the fixed contact, and the fixed contact by manual operation And a handle for operating the opening and closing of the movable contact. A spacer is disposed between the first and second circuit breakers, which is generated when the movable contact is separated from the fixed contact. A circuit breaker, wherein a permanent magnet for eliminating an arc from between the fixed contact and the movable contact is disposed in a hole provided in the spacer. 4. A circuit breaker in which first and second circuit breakers are juxtaposed, wherein each of the first and second circuit breakers is disposed in a container made of a non-magnetic material and in the container. Fixed contact and movable contact, a movable arm that is accommodated in the container and supports the movable contact so that the movable contact can freely contact and separate from the fixed contact, and the fixed contact by manual operation And a handle for operating the opening and closing of the movable contact, and a recess is provided on at least one of two outer peripheral surfaces of the containers of the first and second circuit breakers that are in contact with each other, A circuit breaker, wherein a permanent magnet for removing an arc generated when the movable contact is separated from the fixed contact from between the fixed contact and the movable contact is accommodated in the recess. 5. At least one of the first and second circuit breakers further includes a control circuit configured to determine whether a voltage or a current of an electric circuit to which the fixed contact and the movable contact are connected has exceeded a predetermined value. And a movable device that is housed in the container and separates the movable contact from the fixed contact according to the operation of the handle, and contacts the movable contact with the fixed contact. The handle, the movable arm, and the detection device are arranged so that the arm can be rotated, and the movable contact can be separated from the fixed contact in response to detection of the predetermined value or more by the detection device. The circuit breaker according to claim 3, further comprising an associated opening / closing mechanism.