JPH1173870A - Electromagnetic trip device for circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the positioning between components and to improve the assembling property when an electromagnetic coil and a coil iron core are assembled to a yoke to form an electromagnetic trip device. SOLUTION: This assembly is constituted of an L-shaped yoke 9, an electromagnetic coil 10 wound on a resin-molded bobbin 14 and arranged with the flange section 14a of the bobbin 14 along the leg piece section 9a of the yoke 9, a coil iron core 11 inserted into the hollow shaft section of the bobbin 14 of the electromagnetic coil 10 and inserted with the tip into a hole 9c bored on the leg piece section 9a, and an armature 12 with a return spring 13 journalled and connected to the other leg piece section 9a of the yoke 9 to face the armature 11b of the iron core 11. The bobbin 14 of the electromagnetic coil 1O is provided with a pair of hold sections pinching the leg piece sections 9a of the yoke 9 at two opposite positions on the flange section peripheral edge, and the electromagnetic coil 10 is hooked and fixed at the assembling position on the yoke 9 via the hold sections. The hold sections are tapered clicks 14c molded integrally with the bobbin 14 and erected from its flange section peripheral edge, and the bobbin 14 of the electromagnetic coil 10 is overlapped on the leg piece sections 9a of the yoke 9 for click connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic trip device for a circuit breaker incorporated in a resin case in connection with a contact opening / closing mechanism.

[0002]

2. Description of the Related Art First, FIG. 6 shows an overall configuration of a circuit breaker to which the present invention is applied. In the drawing, 1 is a resin case having a split structure made of a resin molded product including a case body and a cover, 2 is a fixed contact, 3 is a movable contact, 4
Is a contact opening / closing mechanism, 5 is an opening / closing operation handle, 6 is an electromagnetic trip device (trip unit), 7 and 8 are main circuit terminals, and each part is assembled at a predetermined position in the resin case 1 to form a circuit breaker. Make up.

FIG. 7 is a diagram showing a conventional structure of the above-mentioned electromagnetic tripping device 6. The tripping device 6 has an L-shaped yoke 9, an electromagnetic coil (trip coil) 10, and an oil dump. It is composed of an assembly of a coil iron 11 having a pot structure, an armature 12 swingably attached to the yoke 9 and a return spring 13.
Is fitted into a positioning step (not shown) formed in the resin case and is incorporated at a predetermined position.

Here, the electromagnetic coil 10 is wound around a bobbin 14 of a resin molded product. Further, the coil core 11 is attached to the armature 11 by a cylindrical cylinder 11a made of a non-magnetic material.
b, the plunger 11c, and the return spring 11d are incorporated into the structure in which silicone oil is sealed. In the assembled state shown in the drawing, the electromagnetic coil 10 is superimposed on one leg 9a of the L-shaped yoke 9, and the flange 14a of the bobbin 14 is placed along with the leg 9a. . The coil core 11 is inserted into the hollow shaft portion 14b of the bobbin 14 with the armature 11b facing upward, and the lower end of the coil core 11 is inserted into a round hole for iron core fitting formed in the leg piece 9a of the yoke 9. And is soldered to the yoke 9.

[0005] The switching operation of the circuit breaker is well known. In the ON state shown in the figure, the main circuit current flows from the terminal 7 to the lead 15, the movable contact 3, the fixed contact 2, and the electromagnetic coil of the electromagnetic trip device 6 It flows to terminal 8 via 10. here,
When the operating handle 5 is tilted to the OFF position, the contact holder 16 holding the movable contact 3 rotates clockwise about the latch pin 17 and the movable contact 3 is separated from the fixed contact 2 (O
FF operation). When an overcurrent flows in the main circuit and the electromagnetic trip device 6 sucks the armature 12, the operation piece 12 a provided on the armature 12 moves the locking lever 1 of the opening / closing mechanism 4.
8, the contact holder 16 unlocked by the latch pin 17 is rotated clockwise by the spring force of the blocking spring 19, and the movable contact 3 is separated (trip operation).

[0006]

In the conventional structure of the electromagnetic tripping device shown in FIG.
0, in order to fix the coil core 11, the electromagnetic coil 10
The tip of the coil core 11 inserted into the bobbin 14 is fixed to the leg portion 9a of the yoke 9 by soldering. In order to improve the solderability at this time, a copper base is provided on the soldered portion. A surface treatment of tin plating is required, which causes a problem that the number of steps is increased and the cost is increased.

Therefore, the inventors have disclosed in Japanese Patent Laid-Open No. 8-29
No. 8065 discloses an assembly structure of an electromagnetic trip device that does not require soldering. However, although the proposed assembling structure does not require soldering, the number of parts and the number of assembling steps are increased, and it cannot be said that the structure is sufficiently satisfactory. In particular, in a structure in which a U-shaped notch is formed in a leg piece portion of a yoke and a coil iron core is inserted therein, a loss of electromagnetic force occurs due to an air gap generated in the U-shaped notch. In order to reduce the number of parts, the number of parts and the number of assembling steps are increased because an auxiliary yoke is additionally provided. Also,
In a structure in which an insertion type fitting portion is formed on one side of a flange portion of a bobbin of an electromagnetic coil, and this fitting portion is inserted into and fixed to a side edge of a leg portion of a yoke during assembly, a yoke is used. In contrast, the bobbin is cantilevered, so that the positioning and holding of the assembly position lacks stability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in consideration of the above-mentioned problems, and is an improvement of the previously proposed assembling structure to further improve the positioning and holding between components and the assembling property. An object of the present invention is to provide an electromagnetic trip device.

[0009]

According to the present invention, there is provided an electromagnetic trip device for a circuit breaker incorporated in a resin case in connection with a contact opening / closing mechanism.
An L-shaped yoke, an electromagnetic coil in which a coil is wound around a bobbin of a resin molded product, and a flange portion of the bobbin is arranged along a leg piece of the yoke, and a bobbin of the electromagnetic coil A coil core fitted into the hollow shaft portion and having a tip fitted into a hole drilled in one leg portion of the yoke, and swinging to the other leg portion of the yoke facing the armature of the core; An assembly comprising an armature with a return spring movably pivotally connected to the bobbin of the electromagnetic coil, wherein a pair of yoke leg pieces are sandwiched from right and left at two opposing locations on the periphery of the flange. , And the electromagnetic coil is locked and fixed at an assembly position on the yoke via the grip portion (claim 1).

By adopting such a configuration, when the electromagnetic coil is attached to the leg portion of the yoke, the pair of grips formed on the bobbin flange of the electromagnetic coil can move the leg portion of the yoke from the left and right. By holding the tip of the coil core inserted into the electromagnetic coil and fitting it into the hole drilled in the leg part of the yoke,
The three components of the yoke, the electromagnetic coil, and the coil core are stably positioned and fixed at predetermined positions.

Here, the gripping portion provided on the bobbin of the electromagnetic coil can be specifically configured as follows. (1) The grip portion is formed integrally with the bobbin by a click with a tapered guide rising from the periphery of the flange portion (Claim 2). It can be fitted and connected by one-touch operation just pushing it in so as to overlap with the iron leg.

(2) In the above-mentioned item (1), the click is formed at an asymmetrical position with respect to the flange of the bobbin.
An assembly error in which the mounting posture of the electromagnetic coil relative to the yoke is wrong is prevented. (3) In the above (1), a compression spring member is interposed between the flange of the bobbin and the leg of the yoke (claim 4), and rattling occurs in an assembled state due to component dimensional tolerances. To prevent

(4) The grip portion is formed integrally with the bobbin by an L-shaped holder standing inward from the periphery of the flange portion (claim 5). Sliding along the leg pieces, the leg pieces are inserted between the holders so as to be connected. (5) In the preceding paragraph (4), an embossing is formed on the leg portion of the yoke, and an insertion guide groove is formed on the end face of the bobbin flange opposite to the embossing, with one end of the groove being open at the periphery of the flange. According to a sixth aspect of the present invention, it is possible to prevent an occurrence of an assembly error in which an assembling posture of an electromagnetic coil is wrongly oriented with respect to a yoke.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
A description will be given based on each embodiment shown in FIGS.
In the drawings of each embodiment, the same reference numerals are given to members corresponding to FIG. [Embodiment 1] FIGS. 1 (a) to 1 (c) show the first and second embodiments of the present invention.
1 shows a configuration of an embodiment corresponding to FIG. In this embodiment, the left and right sides of the bobbin 14 of the electromagnetic coil 10 which stand on the side of the flange 14a facing the leg piece 9a of the yoke 9 from the opposite portion of the periphery of the flange as a gripping portion are provided as grips. A pair of clicks (engaging claws) 14c are integrally formed with the bobbin of the resin molded product. This click 14c is shown in FIG.
As shown by (b), the inner end surface of the claw portion has a tapered surface 14d.
And the interval between the left and right clicks is yoke 9
Are set in accordance with the width dimension d of the leg piece 9a. On the other hand, an iron core fitting hole (round hole) 9c into which the coil core 11 is fitted is drilled in the center of the leg piece 9a of the yoke 9.

When assembling the electromagnetic tripping device 6, the coil core 11 is inserted into the bobbin 14 of the electromagnetic coil 10 and placed on the leg 9a of the yoke 9. Is inserted into the hole 9c formed in the leg piece 9a and positioned, and the click 14c is moved to the leg piece 9a.
The bobbin 14 is oriented so as to face the left and right side edges of the bobbin, and the bobbin 14 is pushed from above in this state. As a result, the click 14c is pressed against the left and right edges of the leg portion 9a of the yoke 9, and the click itself is pushed outward with the tapered surface 14d as a guide, as indicated by the dotted line in FIG. The bobbin 14 is locked and fixed at a predetermined assembly position in such a manner that the click 14c is clamped from both sides of the leg piece 9a.

Thereafter, the assembly of the electromagnetic trip device 6 is shown in FIG.
At a predetermined position of the resin case 1 shown in FIG. FIG.
3A, reference numerals 1a and 1b denote positioning pieces provided inside the resin case 1. The upper flange of the coil core 11 is fitted into the groove of the positioning piece 1a at the installation position, and the yoke 9
Is fitted to the positioning piece 1b to be positioned and fixed at a predetermined position.

[Embodiment 2] FIG. 2 shows an applied embodiment of the embodiment 1 according to the third aspect. In this embodiment, a click 14c is formed at a left-right asymmetric position with respect to a flange 14a of the bobbin 14. That is,
One of the pair of left and right clicks 14c is the bobbin flange 1
4a protrudes outward from the periphery and the other is formed inside the periphery. A concave notch 9d is formed at one side edge of the leg piece 9a of the yoke 9 in accordance with the position of the click 14c.

That is, the direction of the mounting posture of the electromagnetic coil 10 with respect to the yoke 9 is specified in consideration of the lead extraction position, and if the direction of the electromagnetic coil is reversed during assembly,
The later lead wiring becomes difficult. In this regard, with the above configuration, the mounting orientation of the electromagnetic coil 10 with respect to the yoke 9 is uniquely determined. If the orientation of the electromagnetic coil is erroneously reversed during assembly, the click 14c cannot engage with the yoke 9 Thus, the occurrence of an assembly error can be prevented.

Embodiment 3 FIGS. 3A and 3B show an embodiment corresponding to claim 4. FIG. In this embodiment, a concave groove 14e is formed in the flange 14a of the bobbin 14 around a hole opened at the center of the end face thereof, and a compression spring (coil spring) 20 is interposed here. As described in the first and second embodiments, when the electromagnetic coil 10 is mounted on the yoke 9, the spring force of the compression spring 20 acts to push the bobbin 14 upward against the yoke 9. . This compensates for play (play) between the yoke 9 and the flange 14a of the bobbin 14 due to the dimensional tolerance of the component (click 14c) and the like, and stably mounts the electromagnetic coil 10 on the yoke 9. Can be attached.

As a compression spring member, a rubber piece having a cushioning property can be interposed between the yoke 9 and the flange portion 14a of the bobbin instead of the coil spring described above. [Embodiment 4] FIGS. 4 (a) to 4 (c) show an embodiment corresponding to claim 5. FIG. In this embodiment, a pair of left and right grips provided on the flange portion 14a of the bobbin 14 of the electromagnetic coil 10 is formed integrally with the bobbin 14 by an L-shaped holder 14f which is raised inward from the periphery of the flange portion. It is configured. On the other hand, the leg piece 9a of the yoke 9 is formed with a positioning stopper 9e that defines an assembling position of the electromagnetic coil 10 protruding laterally from the left and right side edges.

To assemble the electromagnetic coil 10 with the yoke 9, the flange 14a of the bobbin 14 is overlapped with the tip of the leg 9a of the yoke, and the end of the holder 14f is stopped from the right side in the figure. The slide operation is performed until the slide piece 9e hits 9e, and in this process, the left and right side edges of the leg piece 9a are pushed into the groove of the holder 14f. As a result, the leg piece 9a of the yoke 9 is locked and fixed at a predetermined assembly position while being sandwiched between the pair of left and right holders 14f, and at the same time, an iron core fitting hole drilled in the leg piece 9a at this position. 9c coincides with the shaft hole of the bobbin 14. Subsequently, the coil core 11 is inserted into the hollow shaft of the bobbin 14 from above, and the tip of the core is inserted into the core fitting hole 9 c of the yoke 9.
Plug in. In this case, if the height of the holder 14f is set so that the fitting with the yoke 9 is tight, the positioning and fixing can be performed stably without occurrence of backlash.

[Embodiment 5] FIGS. 5 (a) to 5 (c) show an applied embodiment of the above-described embodiment 5 corresponding to claim 6.
In this embodiment, an emboss 9f is formed on the plate surface of the leg 9a of the yoke 9 so as to protrude toward the bobbin 14 of the electromagnetic coil 10, and the flange of the bobbin 14 faces the emboss 9f. An insertion guide groove 14g as a concave groove is formed on the end face of 14a. This guide groove 1
Reference numeral 4g denotes a blind alley-like long groove extending along the insertion direction of the bobbin 14, one end of which is open to the peripheral edge of the flange portion 14a in accordance with the direction of the mounting posture of the electromagnetic coil 10.

According to this configuration, similarly to the above-described second embodiment, the orientation of the mounting posture of the electromagnetic coil 10 with respect to the yoke 9 is uniquely defined by the combination of the emboss 9f and the guide groove 14g. Therefore, even if the electromagnetic coil 10 is erroneously assembled in the reverse orientation, in this case, the flange 14a of the bobbin 14 may interfere with the embossment 9f on the yoke side and insert the holder 14f into the leg piece 9a. I ca n’t,
Thereby, assembly errors can be reliably prevented.

In each of the embodiments described above,
As a positioning gripping portion for locking and fixing the flange portion of the coil core 11 to the upper flange portion of the bobbin 14, a hook-shaped locking claw portion 14h indicated by a chain line in FIG. Section is disclosed in Japanese Patent Application Laid-Open No. 8-2980065 previously proposed).
0, since the components are integrally connected to each other with the coil core 11 assembled, it is easy to mount and position the electromagnetic trip device in the resin case.

[0025]

As described above, according to the structure of the present invention, when assembling the electromagnetic tripping device by assembling the electromagnetic coil and the coil core with the yoke, the yoke and the coil are used as in a conventional product. In addition to eliminating the need for soldering to the iron core, it also offers excellent effects in assembling and improving the positioning accuracy between components, thereby providing a highly reliable electromagnetic trip device for circuit breakers. be able to.

[Brief description of the drawings]

FIG. 1 is an assembly configuration diagram of an electromagnetic trip device according to a first embodiment of the present invention, (a) is a side view, (b) is a front view,
(c) is a bottom view

FIG. 2 is a bottom view of an electromagnetic trip device according to a second embodiment of the present invention.

FIG. 3 is an assembly configuration diagram of an electromagnetic trip device according to a third embodiment of the present invention, where (a) is a side view and (b) is a front view.

FIG. 4 is an assembly configuration diagram of an electromagnetic trip device corresponding to a fourth embodiment of the present invention, wherein (a) is a side view, (b) is a front view,
(c) is a bottom view

FIG. 5 is an assembly configuration diagram of an electromagnetic trip device corresponding to a fifth embodiment of the present invention, (a) is a side view, (b) is a front view,
(c) is a bottom view

FIG. 6 is a diagram showing an internal configuration of a circuit breaker according to an embodiment of the present invention.

7 is a side sectional view of a conventional configuration of the electromagnetic trip device in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin case of circuit breaker 4 Contact opening / closing mechanism 6 Electromagnetic trip device 9 Yoke 9a, 9b Leg piece 9c Iron core fitting hole 9e Stopper 9f Emboss 10 Electromagnetic coil 11 Coil iron 11b Armature 12 Armature 13 Return spring 14 Bobbin 14a Collar 14b Hollow shaft 14c Click (grip) 14f Holder (grip) 14g Insert guide groove 20 Compression spring

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Naoji Uchida 1-1-1, Tanabe Shinda, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fuji Electric Co., Ltd.

Claims (6)

[Claims] An electromagnetic trip device for a circuit breaker incorporated in a resin case in connection with a contact opening / closing mechanism, wherein a coil is wound around an L-shaped yoke and a bobbin of a resin molded product, and An electromagnetic coil in which a flange portion of a bobbin is arranged on a leg portion of the yoke, and a hollow shaft portion of the bobbin of the electromagnetic coil is inserted and a tip is pierced in one leg portion of the yoke. And an armature with a return spring, which is pivotally connected to the other leg of the yoke in opposition to the armature of the iron core and fitted to the armature, The bobbin of the electromagnetic coil is provided with a pair of gripping portions that sandwich the leg portion of the yoke from the left and right at two opposing positions on the periphery of the flange portion, and assembles the electromagnetic coil on the yoke through the gripping portions. An electromagnetic tripping device for a circuit breaker, wherein the electromagnetic tripping device is locked and fixed to the device. 2. The electromagnetic trip device according to claim 1, wherein
A pair of grips provided on the bobbin flange of the electromagnetic coil is a click with a taper guide that is formed integrally with the bobbin and rises from the periphery of the flange, and the yoke leg spreads while pushing the tip of the click to the left and right sides. An electromagnetic tripping device for a circuit breaker, wherein the electromagnetic tripping device is overlapped on one piece and fitted and connected. 3. The electromagnetic trip device according to claim 2, wherein
An electromagnetic trip device for a circuit breaker, wherein a click is formed at an asymmetrical position with respect to a flange portion of a bobbin. 4. The electromagnetic trip device according to claim 1, wherein
An electromagnetic trip device for a circuit breaker, wherein a compression spring member is interposed between a flange portion of a bobbin and a leg portion of a yoke. 5. The electromagnetic trip device according to claim 1, wherein
A pair of grips provided on the bobbin flange of the electromagnetic coil are L-shaped holders formed integrally with the bobbin and standing inward from the periphery of the flange, and the flange of the bobbin is connected to a leg piece of a yoke. An electromagnetic trip device for a circuit breaker, characterized in that the device is slid along and inserted between the holders. 6. The electromagnetic trip device according to claim 5, wherein
A circuit breaker characterized in that an embossing is formed on a leg portion of a yoke, and an insertion guide groove is formed on an end face of a bobbin flange facing the embossing, with one end of a groove being open on a periphery of the flange. Electromagnetic trip device.